JP7024938B2 - Connection structure of split support - Google Patents

Description

The present invention relates to a connecting structure of split support works.

The NATM method (New Austrian Tunneling Method) is known as a method for constructing a tunnel. The NATM method uses sprayed concrete, rock bolts, and steel support as appropriate based on the idea of effectively utilizing the support capacity and strength of the ground to maintain the stability of the tunnel. It is a construction method to construct an integrated tunnel structure.

When constructing a tunnel in the NATM method, when an arch-shaped steel support is installed, it is usually carried out by the procedure described below. First, a sprayer is set near the face, and concrete is first sprayed on the face, and when this is completed, the sprayer is ejected. Next, a work vehicle equipped with an erector for building the support work is placed near the face, and an arch-shaped steel support work is built in the tunnel pit wall near the face by the elector, and when this is completed, the work vehicle is discharged. Next, the sprayer is relocated to the face, the built-in tunnel support is embedded, the concrete is secondarily sprayed, and the sprayer is ejected.

When building a steel support, the hand attached to the tip of the boom of heavy machinery such as an elector device or a drill jumbo grips a pair of left and right split support divided into an arc shape for the construction work. After that, it is common to build in an arch shape by abutting the joint plates provided at the top ends of the left and right split supports and joining them with bolts, but such bolt joining is a manual work. The reality is that there is. That is, in the connection structure of the split support using bolt joint, the joint plates provided in the left and right split support are provided on the work scaffold or the boom of the heavy machine assembled near the face in a state of being in contact with each other. Personnel are placed in the man cage, etc., the personnel are moved to the vicinity of the top of the tunnel, bolts are inserted between the joint plates of the split support located near the top, and the bolts are fastened with nuts. It was necessary to carry out the connection work by.

On the other hand, in recent years, a convex connecting portion is provided on the joint plate of one of the left and right steel support works, and a concave connecting portion is provided on the joint plate of the other steel support work to grip the steel support work. A steel support connection structure has also been proposed that makes it possible to connect a pair of steel support works in an arch shape by relatively moving the hand of the heavy machine to engage the convex connection part with the concave connection part. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-115446 JP-A-2017-106272 Japanese Unexamined Patent Publication No. 2000-45695

By the way, when joining joint plates in a pair of steel supports, it is necessary to join the joint plates at a plurality of places in order to ensure stress transmission between the joint plates. For example, in the connecting structure of the steel support described in Patent Document 1, a set of a convex connecting portion and a set of a concave connecting portion are arranged on each joint plate. However, it is not easy to perform hand operation of heavy machinery with high accuracy, and when joining joint plates in a pair of steel supports at multiple points, the convex connecting part and the concave connecting part are connected in the wrong combination. There was a risk that it would end up.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to connect a pair of split support works to each other in a plurality of joint plates in a connecting structure for connecting the pair of split support works. It is an object of the present invention to provide a technique for suppressing the male-type connecting portion and the female-type connecting portion from being connected in an erroneous combination in the case of joining with.

The present invention for solving the above-mentioned problems is a connecting structure for connecting a pair of divided support works divided in an arc shape to form an arch-shaped tunnel support work built along a tunnel pit wall. , The first top end of the obstruction plate part for suppressing erroneous connection of the male type connection part convexly provided on the second top end joint plate with respect to the female type connection part recessed in the first top end joint plate. It was installed on the joint plate.

More specifically, the present invention is a connecting structure for connecting a pair of arc-divided split supports that form an arch-shaped tunnel support built along the tunnel wall, and the pair. The first top end joint plate and the second top end joint plate, which are provided at the top ends of the split support works and are in contact with each other when the pair of split support works are connected, and the first top end. The first female type connecting portion and the second female type connecting portion recessed in the joint plate, and the first male type connecting portion and the second male type connecting portion convexly provided in the second top end joint plate. In the first crown joint plate and the second crown joint plate, the first male type connecting portion is connected to the first female type connecting portion, and the second female type connecting portion is connected to the second female type connecting portion. By connecting the male type connecting portions, they are joined in a predetermined normal contact state, and the baffle plate portion for suppressing erroneous connection of the second male type connecting portion to the first female type connecting portion is the first. It is provided on the top joint plate.

According to the present invention, when joint plates in a pair of split support works are joined at a plurality of locations, it is possible to prevent the male-type connecting portion and the female-type connecting portion from being connected in an erroneous combination.

Further, in the present invention, the first female type connecting portion and the second female type connecting portion are recessed in parallel in the lateral width direction of the first top end joint plate, and the first male type connecting portion and the said. The second male type connecting portion is projected in parallel in the lateral width direction of the second top end joint plate, and the obstruction plate portion has a width wider than that of the first female type connecting portion in the first top end joint plate. By projecting the region outside the direction outward from the first contact region portion that abuts the second crown joint plate when the first crown joint plate is in the normal contact state. When the pair of split support works are connected, the baffle plate portion interferes with the first male type connecting portion, so that the second male type connecting portion is erroneously connected to the first female type connecting portion. May be configured to be suppressed.

Further, in the present invention, the side edge of the first crown joint plate located on the side of the second female connecting portion is sided in a direction vertically separated from the outer surface of the first crown joint plate. The edge guide plate is projected, and when connecting the pair of split support works, the side edge of the second crown joint plate located on the side of the second male type connecting portion is with the side edge guide plate. By abutting, the lateral position of the first male type connecting portion with respect to the first female type connecting portion and the lateral position of the second male type connecting portion with respect to the second female type connecting portion are configured to be aligned with each other. May be.

Further, in the present invention, an upper edge guide plate is projected from the upper edge of the first top end joint plate in a direction vertically separated from the outer surface of the first top end joint plate. When connecting the pair of split support works, the upper edge of the second top end joint plate comes into contact with the upper edge guide plate, so that the height of the first male type connecting portion with respect to the first female type connecting portion is high. It may be configured so that the vertical position and the height position of the second male type connecting portion with respect to the second female type connecting portion are aligned with each other.

Further, in the present invention, the first female type connecting portion and the second female type connecting portion are recessed in parallel in the lateral width direction of the first top end joint plate, and the first male type connecting portion and the said. The second male type connecting portion is projected in parallel in the lateral width direction of the second crown joint plate, and the obstruction plate portion is formed from the upper edge of the first crown joint plate to the first crown joint plate. When the pair of split support works are connected, the obstruction plate portion interferes with the upper edge of the second top joint plate, so that the pair of split support works is projected so as to be vertically separated from the outer surface of the above. It may be configured so as to suppress erroneous connection of the second male type connecting portion to the first female type connecting portion.

Further, in the present invention, the obstruction plate portion is provided along the upper edge of the first top end joint plate, and the side end is located on the first female type connecting portion side of the first top end joint plate. A guide wall portion extending outward in the width direction from the side edge thereof, and a guide wall portion extending downward from the lateral end of the guide wall portion and the first of the first top end joint plates. It has a side edge located on the female connecting portion side and an interference wall portion arranged at intervals, and when connecting the pair of split support works, the upper edge of the second top joint plate is formed. By interfering with the lower edge of the interference wall portion, erroneous connection of the second male type connection portion to the first female type connection portion is suppressed, and the upper edge of the second top end joint plate is connected to the guide wall portion. By abutting, the height position of the first male type connecting portion with respect to the first female type connecting portion and the height position of the second male type connecting portion with respect to the second female type connecting portion can be aligned. It may be configured.

Further, in the present invention, the second contact region portion that abuts on the upper edge of the second top joint plate with the first top joint plate when the second top joint plate is in the normal contact state. The upper edge portion of the protrusion is formed so as to project upward from the above, and when the pair of split support works are connected, the baffle plate portion interferes with the upper edge portion of the protrusion, whereby the first It may be configured so as to suppress erroneous connection of the second male type connecting portion to the female type connecting portion.

Further, in the present invention, the protrusion upper edge portion is provided in a region closer to the side edge located on the second male type connecting portion side than the lateral width direction central portion in the upper edge of the second top end joint plate. The baffle plate portion may be provided in a region closer to the side edge located on the side of the first female mold connecting portion than the central portion in the lateral width direction on the upper edge of the first top end joint plate.

Further, in the present invention, the baffle plate portion is provided on a non-projection portion of the upper edge of the second top end joint plate on which the protrusion upper edge portion is not formed when connecting the pair of split supports. When the edge portion abuts, the height position of the first male type connecting portion with respect to the first female type connecting portion and the height position of the second male type connecting portion with respect to the second female type connecting portion are matched. It may also serve as a guide section.

Further, in the present invention, the side edge of the first crown joint plate located on the side of the second female connecting portion is sided in a direction vertically separated from the outer surface of the first crown joint plate. The edge guide plate is projected, and when connecting the pair of split support works, the side edge of the second crown joint plate located on the side of the second male type connecting portion is with the side edge guide plate. By abutting, the lateral position of the first male type connecting portion with respect to the first female type connecting portion and the lateral position of the second male type connecting portion with respect to the second female type connecting portion are configured to be aligned with each other. May be.

Further, in the present invention, each of the first female connecting portion and the second female connecting portion has a rod-shaped male locking member protruding from the second top joint plate, and the first female. Each of the mold connecting portion and the second female connecting portion has an opening hole formed through the first top end joint plate and an insertion port that communicates with the opening hole and into which the male locking member can be inserted. May include a casing having a storage chamber in which an opening is formed, and may be configured to lock the male locking member inserted into the storage chamber from the insertion slot.

Further, in the present invention, the opening hole may have a tapered surface whose diameter increases from the inner surface side to the outer surface side in the thickness direction of the first top end joint plate.

Further, in the present invention, a tapered surface whose diameter is reduced toward the tip may be formed at the tip of the male locking member.

According to the present invention, in the connecting structure for connecting a pair of split support works, when the joint plates in the pair of split support works are joined at a plurality of places, the male type connecting portion and the female type connecting portion are erroneously combined. It is possible to provide a technique for suppressing the connection with.

FIG. 1 is a side view of the tunnel support according to the first embodiment. FIG. 2 is a diagram illustrating a tunnel support structure according to the first embodiment. FIG. 3 is a schematic configuration diagram of a built-in system for tunnel support according to the first embodiment. FIG. 4 is a top view of the work platform according to the first embodiment. FIG. 5 is a side view of the work platform according to the first embodiment. FIG. 6 is a diagram showing a mounting position of the target to the tunnel support according to the first embodiment. FIG. 7 is a diagram showing a target according to the first embodiment. FIG. 8A is a front view of the first top end joint plate according to the first embodiment. FIG. 8B is a rear view of the first top end joint plate according to the first embodiment. FIG. 8C is a side view of the first top end joint plate according to the first embodiment. FIG. 9A is a front view of the second top end joint plate according to the first embodiment. FIG. 9B is a rear view of the second top end joint plate according to the first embodiment. FIG. 9C is a side view of the second top end joint plate according to the first embodiment. FIG. 10 is a schematic view showing a connecting structure for connecting the left side split support and the right side split support according to the first embodiment. FIG. 11 is a cross-sectional view taken along the line XX in FIG. FIG. 12A is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the first embodiment are joined. FIG. 12B is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the first embodiment are joined. FIG. 12C is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the first embodiment are joined. FIG. 13 is a diagram showing a state in which the female type connecting portion and the male type connecting portion according to the first embodiment are connected. FIG. 14 is a diagram illustrating a situation in which erroneous connection of the second male type connecting portion in the second top end joint plate to the first female type connecting portion in the first top end joint plate according to the first embodiment is suppressed. be. FIG. 15 is a diagram illustrating a connection structure according to a modified example of the first embodiment. FIG. 16A is a front view of the first top end joint plate according to the second embodiment. FIG. 16B is a side view of the first top end joint plate according to the second embodiment. FIG. 17 is a diagram illustrating a situation in which erroneous connection of the second male type connecting portion in the second top end joint plate to the first female type connecting portion in the first top end joint plate according to the second embodiment is suppressed. be. FIG. 18 is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the second embodiment are joined. FIG. 19 is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the second embodiment are joined. FIG. 20A is a front view of the first top end joint plate according to the third embodiment. FIG. 20B is a side view of the first top end joint plate according to the third embodiment. FIG. 21A is a front view of the first top end joint plate according to the third embodiment. FIG. 21B is a side view of the first top end joint plate according to the third embodiment. FIG. 22 is a diagram illustrating a situation in which erroneous connection of the second male type connecting portion in the second top end joint plate to the first female type connecting portion in the first top end joint plate according to the third embodiment is suppressed. be. FIG. 23 is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the third embodiment are joined. FIG. 24 is a diagram illustrating a situation in which the first top end joint plate and the second top end joint plate according to the third embodiment are joined.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a side view of the tunnel support 10 according to the first embodiment. The tunnel support 10 is an arch-shaped steel support built along the pit wall immediately after excavation in order to prevent the collapse of the ground exposed due to the tunnel excavation, and is a regular interval along the tunnel axial direction. It is installed every time. The tunnel support 10 in the present embodiment is formed of H-shaped steel having an H-shaped cross section. More specifically, the tunnel support 10 is formed in an arch shape by integrally connecting the top end portions (upper end portions) of the pair of arcuate split support works 10L and 10R. Hereinafter, the split support 10L is referred to as "left split support", and the split support 10R is referred to as "right split support".

The left side split support 10L has a first main body portion 111, a first top end joint plate 121, and a first bottom plate 131. The first main body portion 111 is an H-shaped steel composed of a web 111a, a pair of ground side flanges 111b orthogonal to the web 111a, and an inner air side flange 111c. Further, the first top end joint plate 121 is welded to one end of the first main body 111, and the first bottom plate 131 is welded to the other end. The first top end joint plate 121 and the first bottom plate 131 are rectangular steel flat plates, and extend in a direction orthogonal to the H-shaped cross section of the first main body portion 111. Similarly, the right side split support 10R also has a second main body portion 112, a second top end joint plate 122, and a second bottom plate 132. The second main body portion 112 is an H-shaped steel composed of a web 112a, a pair of ground side flanges 112b orthogonal to the web 112a, and an inner air side flange 112c. Further, a second top end joint plate 122 is welded to one end of the second main body portion 112, and a second bottom plate 132 is welded to the other end. The second top joint plate 122 and the second bottom plate 132 are rectangular steel flat plates, and extend in a direction orthogonal to the H-shaped cross section of the second main body portion 112. In the present embodiment, the first crown joint plate 121 and the second crown joint plate 122 have a congruent square plane. As shown in FIG. 1, the left side split support 10L and the right side split support 10R are connected in a state where the first top end joint plate 121 and the second top end joint plate 122 are butted against each other.

FIG. 2 is a diagram illustrating the tunnel support structure 1 according to the first embodiment. Reference numeral 3 in FIG. 2 is a primary sprayed concrete layer. Further, reference numeral 6 is a secondary sprayed concrete layer. Note that FIG. 2 shows the right split support 10R of the tunnel support 10. In the tunnel construction method of the present embodiment, after the ground 7 is exposed on the side surface of the tunnel T by excavation of the face 8, the primary concrete is sprayed on the ground 7 to perform the primary sprayed concrete. Layer 3 is formed. After that, the arch-shaped tunnel support 10 described above is built on the inner air side of the primary sprayed concrete layer 3 along the wall surface of the tunnel. The tunnel support 10 is adjacent to the face 8 side of the existing tunnel support 10 located on the wellhead side of the tunnel T, and has a predetermined interval (for example, 1.0 m to 1.5 m) in the axial direction of the tunnel T. Degree). The construction of the tunnel support 10 is performed by using an elector device equipped with a hand attached to a pair of boom tips. Hereinafter, the method of building the tunnel support 10 will be described in detail.

FIG. 3 is a schematic configuration diagram of the built-in system S of the tunnel support 10 according to the first embodiment. In the figure, reference numeral 100 is an erector device for building the tunnel support work 10, and reference numeral 200 is a work vehicle (heavy machine) equipped with the erector device 100 and capable of self-propelling. Reference numeral 300 is an automatic tracking type total station that is a distance measuring and angle measuring instrument (surveying instrument) using laser light, reference numeral 400 is a total station controller that controls the total station 300, and reference numeral 500 is a total station side that enables wireless transmission and reception with the total station controller 400. It is an antenna.

The Elekta device 100 includes a monitor 101, an Elekta controller 102, an Elekta side antenna 103, an operation panel 104, a keyboard 105, a Ponting device 106, and the like, which are display devices mounted on the cockpit.

The total station 300 is a surveying instrument that measures (measures) the position of the target 9 by irradiating a laser beam to automatically track the target 9 including a prism and measuring the distance and angle thereof, and is inside the tunnel T. It is installed at a point where the coordinates are known (points with known coordinates). In the present embodiment, the target 9 is attached to the tunnel support 10 (left split support 10L and right split support 10R) built in the face 8, and the tunnel support 10 (left split support 10L and right split support 10R) is attached. Since the target 9 is automatically tracked as the target moves, it is preferable to select and install a place where there is no obstacle in the automatic tracking and collimation of such a target. For example, it may be installed on the floor of the tunnel, or a pedestal may be erected on the ceiling and the total station 300 may be installed on the pedestal.

The total station controller 400 is configured to include, for example, a portable computer. The total station controller 400 automatically controls various mechanisms of the total station 300 by software incorporated in the computer, and processes the survey data of the total station 300. Further, the total station controller 400 can transmit and receive data by wireless communication with the erector controller 102 side, and can remotely control various mechanisms of the total station 300 by a command from the erector controller 102 side. ..

FIG. 4 is a top view of the work vehicle 200 according to the first embodiment. FIG. 5 is a side view of the work vehicle 200 according to the first embodiment. The work vehicle 200 includes an elector device 100 and a spraying device 600. The elector device 100 includes a pair of booms 17L and 17R having the same configuration. The pair of booms 17L and 17R can freely expand and contract, tilt, swing, and rotate by operating the drive mechanism attached to them. Further, a pair of hands 18L and 18R having the same configuration are connected to the tips of the booms 17L and 17R. The pair of hands 18L and 18R can freely rotate and swing by the operation of the drive mechanism attached to them, and the left split support 10L and the right split support 10R can be detachably gripped (held), respectively. )can do.

Hereinafter, the boom indicated by the reference numeral 17L is referred to as a “left side boom”, and the boom indicated by the reference numeral 17R is referred to as a “right side boom”. Further, the hand indicated by the reference numeral 18L is referred to as a "left hand", and the hand indicated by the reference numeral 18R is referred to as a "right hand". The erector device 100 can detachably grip the left split support 10L on the left hand 18L and the right split support 10R on the right hand 18R. In the present embodiment, the left split support 10L and the right split support 10R are a pair of support materials in which the arch-shaped tunnel support 10 is divided into two, and after being guided to the vicinity of the face 8, these are faced. Assemble with 8 to form an arch-shaped tunnel support 10.

FIG. 6 is a diagram showing a mounting position of the target to the tunnel support according to the first embodiment. As shown in FIG. 6, the left split support 10L and the right split support 10R have a symmetrical arc shape. Here, the first target 9a and the second target 9b are attached to the upper end portion and the lower end portion of the left side split support work 10L, respectively. Further, the third target 9c and the fourth target 9d are attached to the upper end portion and the lower end portion of the right side split support work 10R, respectively. Here, the first target 9a to the fourth target 9d are collectively referred to as "target 9". FIG. 7 is a diagram showing a target 9 according to the first embodiment. The target 9 has a magnet 92 provided at the base end of the holder 91 and a prism 93 provided at the tip of the holder 91. Since the left split support 10L and the right split support 10R are made of steel, the target 9 is detachably attached to the left split support 10L and the right split support 10R by the magnetic force of the magnet 92 provided on the holder 91. be able to.

Further, in the example shown in FIG. 7, the target 9 is attached to the inner air side flanges 111c and 112c of the left split support 10L and the right split support 10R. In the present embodiment, marks for attaching each target 9 are marked in advance on the inner air side flanges 111c and 112c of the left split support 10L and the right split support 10R with paint or the like. Further, when each target 9 is attached to the inner space side flanges 111c and 112c of the left split support 10L and the right split support 10R, the height Hp from the mounting surface to the center of the prism 93 is constant.

Next, the spraying device 600 will be described with reference to FIGS. 4 and 5. The spraying device 600 is arranged between the left boom 17L and the right boom 17R, and is provided on the tip side of the arm 601 and the spraying robot 602 supported by the arm 601 and the spraying robot 602. It is equipped with a nozzle 603 and the like. The arm 601 can be expanded and contracted, tilted, and the like. Further, the spraying robot 602 can tilt, rotate, and the like the spray nozzle 603. In addition, the spraying device 600 includes a concrete pump, a quick-setting admixture supply device, a compressor, a high-pressure water pump, and the like. The spraying robot 602 can spray the sprayed concrete onto the face 8 by discharging the sprayed concrete supplied from the concrete pump from the spray nozzle 603.

Next, a method of building the tunnel support 10 in the present embodiment will be described. The NATM method consists of (1) blasting the face 8 or excavating by machine → (2) carrying out scraps → (3) spraying primary sprayed concrete → (4) building tunnel support → (5) secondary blowing. This is a construction method in which the tunnel T is extended in the axial direction by repeating the spraying of concrete to be attached → (6) the placement of rock bolts as one cycle. In the present embodiment, (2) the work vehicle 200 equipped with the erector device 100 is arranged in the vicinity of the face 8 after the step of carrying out the slip is completed (the erector arranging step). At that time, the work vehicle 200 is self-propelled in a state where the left split support 10L and the right split support 10R are gripped along the tunnel axis (tunnel extension direction) on the hands 18L and 18R of the elector device 100, respectively. , Place in the vicinity of the face 8. Then, the primary spray concrete layer 3 is formed by spraying the primary spray concrete on the ground 7 (tunnel wall surface) on which the left split support 10L and the right split support 10R are to be built by using the spray device 600. Form.

Next, the left split support 10L and the right split support 10R are placed at the top by driving the left split support 10L and the right split support 10R while holding the left split support 10L and the right split support 10R to the hands 18L and 18R. They are connected to each other (supporting work connection process). Hereinafter, the connecting structure of the tunnel support 10 (left side split support 10L and right side split support 10R) will be described.

FIG. 8A is a front view of the first top end joint plate 121. FIG. 8B is a rear view of the first top end joint plate 121. FIG. 8C is a side view of the first top end joint plate 121. Here, reference numeral 121a is an outer surface of the first top end joint plate 121, and reference numeral 121b is an inner surface of the first top end joint plate 12L. Reference numeral 121c is the upper edge of the first top end joint plate 121, reference numeral 121d is the lower edge of the first top end joint plate 121, reference numeral 121e is the first side edge of the first top end joint plate 121, and reference numeral 121f is the first heaven. The second side edge of the end joint plate 121. Here, the lower edge 121d of the first top end joint plate 121 faces the inner air side of the tunnel T when the left split support 10L and the right split support 10R are connected, and the upper edge 121c faces the opposite side. That is, it faces the ground 7 side. Further, the second side edge 121f of the first top end joint plate 121 faces the face 8 side of the tunnel T when the left split support 10L and the right split support 10R are connected, and the first side edge 121e It faces the opposite side, that is, the work vehicle 200 (Electa device 100) side.

In FIG. 8B, the end shape of the first main body portion 111 connected to the first top end joint plate 121 is shown by a broken line. Further, FIGS. 8A and 8B show the vertical direction (height direction) and the horizontal width direction of the first top end joint plate 121. The vertical direction of the first top end joint plate 121 is parallel to the extension direction of the first side edge 121e and the second side edge 121f, and the position where the first main body portion 111 is connected to the first top end joint plate 121. Is parallel to the stretching direction of the web 111a in. Further, the lateral width direction of the first top end joint plate 121 is parallel to the extension direction of the upper edge 121c and the lower edge 121d, and the ground side at the position where the first main body portion 111 is connected to the first top end joint plate 121. It is parallel to the stretching direction of the flange 111b and the inner air side flange 111c.

FIG. 9A is a front view of the second top end joint plate 122. FIG. 9B is a rear view of the second top end joint plate 122. FIG. 9C is a side view of the second top end joint plate 122. Here, reference numeral 122a is an outer surface of the second top end joint plate 122, and reference numeral 122b is an inner surface of the second top end joint plate 122. Further, reference numeral 122c is the upper edge of the second top end joint plate 122, reference numeral 122d is the lower edge of the second top end joint plate 122, reference numeral 122e is the first side edge of the second top end joint plate 122, and reference numeral 122f is the first. 2 The second side edge of the top joint plate 122. Here, the lower edge 122d of the second top end joint plate 122 faces the inner air side of the tunnel T when the left split support 10L and the right split support 10R are connected, and the upper edge 122c faces the opposite side. That is, it faces the ground 7 side. Further, the second side edge 122f of the second top end joint plate 122 faces the face 8 side of the tunnel T when the left split support 10L and the right split support 10R are connected, and the first side edge 122e It faces the opposite side, that is, the work vehicle 200 (Electa device 100) side.

In FIG. 9B, the end shape of the second main body portion 112 connected to the second top end joint plate 122 is shown by a broken line. Further, FIGS. 9A and 9B show the vertical direction and the horizontal width direction of the second top end joint plate 122. The vertical direction of the second top end joint plate 122 is parallel to the extension direction of the first side edge 122e and the second side edge 122f, and at a position where the second main body portion 112 is connected to the second top end joint plate 122. It is parallel to the stretching direction of the web 112a. Further, the lateral width direction of the second top end joint plate 122 is parallel to the extension direction of the upper edge 122c and the lower edge 122d, and the ground side at the position where the second main body portion 112 is connected to the second top end joint plate 122. It is parallel to the stretching direction of the flange 112b and the inner air side flange 112c.

As shown in FIGS. 8A and 8B, the first top end joint plate 121 has a horizontally long rectangular shape. On the other hand, as shown in FIGS. 9A and 9B, the second top end joint plate 122 has a square shape. The vertical dimensions of the first crown joint plate 121 and the second crown joint plate 122 are equal to each other, and the width dimension of the first crown joint plate 121 is larger than the width dimension of the second crown joint plate 122. Here, the first top end joint plate 121 includes a baffle plate portion 1210 and a first contact region portion 1211. In FIG. 8A, the region corresponding to the baffle plate portion 1210 is hatched, and the region without the hatching corresponds to the first contact region portion 1211. The plane region of the first top end joint plate 121 is formed by the first contact region portion 1211 and the obstruction plate portion 1210. Further, reference numeral L1 in FIG. 8A is a boundary line located between the obstruction plate portion 1210 and the first contact region portion 1211 in the first top end joint plate 121.

A pair of female mold connecting portions 40 (first female mold connecting portion 40A and second female mold connecting portion 40B) are recessed in the first top end joint plate 121. Further, a pair of male type connecting portions 50 (first male type connecting portion 50A and second male type connecting portion 50B) are convexly provided on the second top end joint plate 122. The connecting structure 30 connecting the left split support 10L and the right split support 10R includes a pair of female connecting portions 40 (first female connecting portion 40A and second female connecting portion 40B) and a pair of male connecting portions. 50 (first male type connecting portion 50A and second male type connecting portion 50B) are included. Here, the first female connecting portion 40A and the second female connecting portion 40B have the same structure, and when they are not distinguished, they are simply referred to as a female connecting portion 40. Further, the first male type connecting portion 50A and the second male type connecting portion 50B have the same structure, and when they are not distinguished, they are simply referred to as a male type connecting portion 50.

In the first top end joint plate 121, the first female mold connecting portion 40A and the second female mold connecting portion 40B are provided in the first contact region portion 1211. As shown in FIG. 8A, the first male type connecting portion 50A is provided in the vicinity of the boundary line L1 between the first male type connecting portion 50A and the baffle plate portion 1210 in the first contact region portion 1211, and the second female type connecting portion 40B is provided. It is provided in the vicinity of the second side edge 121f in the first contact region portion 1211. Further, the first female type connecting portion 40A and the second female type connecting portion 40B are arranged at the same height in the vertical direction of the first top end joint plate 121, and are arranged in the lateral width direction of the first top end joint plate 121. They are arranged side by side along. That is, the arrangement direction of the first female type connecting portion 40A and the second female type connecting portion 40B in the first top end joint plate 121 coincides with the lateral width direction of the first top end joint plate 121.

On the other hand, as shown in FIG. 9A, the first male type connecting portion 50A and the second male type connecting portion 50B in the second top end joint plate 122 are arranged at the same height in the vertical direction of the second top end joint plate 122. The second crown plate 122 is arranged along the lateral width direction. Further, as shown in FIG. 9A, the first male type connecting portion 50A is arranged in the vicinity of the first side edge 122e in the second top end joint plate 122, and the second male type connecting portion 50B is the second side edge 122f. It is located in the vicinity.

Although the details will be described later, the first crown joint plate 121 and the second crown joint plate 122 in the present embodiment have the first female type connecting portion when the left side split support 10L and the right side split support 10R are connected. The first male type connecting portion 50A is connected to 40A, and the second male type connecting portion 50B is connected to the second female type connecting portion 40B so that they are joined to each other in a predetermined normal contact state. It has become. The normal contact state referred to here is a state in which the outer surfaces 121a and 122a are in surface contact with each other so that stress transmission between the first crown joint plate 121 and the second crown joint plate 122 is smoothly performed. It is defined as a state, and in the present embodiment, it refers to a state in which the first contact region portion 1211 of the first top end joint plate 121 just overlaps and contacts the outer surface 122a of the second top end joint plate 122.

In the present embodiment, the first contact region portion 1211 in the second crown joint plate 122 is designed to have the same vertical and horizontal dimensions as the second crown joint plate 122. On the other hand, the obstruction plate portion 1210 in the first top end joint plate 121 projects outward from the first contact region portion 1211 in the lateral width direction, and the first top end joint plate 121 and the second top end joint plate 122 are regular. It is formed as a region that does not overlap with the second top joint plate 122 when joined in the abutting state.

When the first crown joint plate 121 and the second crown joint plate 122 are joined in a normal contact state, the upper edge 121c of the first crown joint plate 121 and the upper edge of the second crown joint plate 122 are joined. The 122c overlaps each other, and the lower edge 121d of the first top end joint plate 121 and the lower edge 122d of the second top end joint plate 122 overlap each other. Further, the boundary line L1 located between the obstruction plate portion 1210 and the first contact region portion 1211 in the first top end joint plate 121 and the first side edge 122e of the second top end joint plate 122 overlap each other, and the first side edge 122e overlaps with each other. 1 The second side edge 121f of the top end joint plate 121 and the second side edge 122f of the second top end joint plate 122 overlap each other.

Further, the first top end joint plate 121 in the present embodiment has a side edge guide plate 1213 and an upper edge guide plate 1214. As shown in FIGS. 8A to 8C, the side edge guide plate 1213 and the upper edge guide plate 1214 each have a rectangular flat plate shape and are made of a steel material. The side edge guide plate 1213 is attached to the second side edge 121f located on the second female connecting portion 40B side of the first top end joint plate 121 by welding or the like, and is attached to the first top end joint plate 121. It is projected toward the front of. In the present specification, the "front" of the first crown joint plate 121 means a direction vertically separated from the outer surface 121a of the first crown joint plate 121. Further, the upper edge guide plate 1214 is attached to the upper edge 121c of the first top end joint plate 121 by welding or the like, and is projected toward the front of the first top end joint plate 121. The side edge guide plate 1213 is provided near the central portion of the second side edge 121f of the first top end joint plate 121 in the vertical direction of the first top end joint plate 121. Further, the upper edge guide plate 1214 is provided in the vicinity of the central portion of the upper edge 121c of the first top end joint plate 121 in the lateral width direction of the first top end joint plate 121.

FIG. 10 is a schematic view showing a connecting structure 30 for connecting the left side split support 10L and the right side split support 10R according to the first embodiment. FIG. 10 shows a state before the left split support 10L and the right split support 10R are connected via the connecting structure 30, that is, a state in which the first top joint plate 121 and the second top joint plate 122 are separated from each other. Is shown.

First, a pair of male connecting portions 50 (first male connecting portion 50A and second male connecting portion 50B) projecting on the second crown joint plate 122 will be described. The second top joint plate 122 is provided with opening holes 1222 at positions where a pair of male connecting portions 50 (first male connecting portion 50A and second male connecting portion 50B) are provided. Further, the male connecting portion 50 has a rod-shaped male locking member 51. The male locking member 51 is a shaft member having a diameter slightly smaller than the opening hole 1222 of the second top joint plate 122, and a male screw 51a is engraved at the base end portion thereof. Further, an annular flange portion 51b is provided in the middle portion of the male locking member 51. Further, a male screw 51c is formed on the outer peripheral portion of the male type locking member 51 at a portion on the tip end side of the flange portion 51b. The male screw 51c of the male locking member 51 is a plurality of male-side locking grooves in the circumferential direction arranged side by side on the outer periphery of the male locking member 51. Further, the tip portion 51d of the male locking member 51 is formed with a tapered surface 51e whose diameter is reduced toward the tip.

Further, a counterbore portion 1223 that is one step recessed from the periphery is formed around the opening hole 1222 on the outer surface 122a side of the second top end joint plate 122. The flange portion 51b of the male locking member 51 is larger than the diameter of the opening hole 1222 of the second top end joint plate 122. The base end side of the male type locking member 51 is inserted into the opening hole 1222 from the outer surface 122a side of the second top end joint plate 122, and the male screw 51a of the base end portion is arranged with the flange portion 51b in the counterbore portion 1223. The nut 52 is screwed into. As a result, the male locking member 51 can be fixed to the second crown joint plate 122 in a state where the male locking member 51 protrudes from the second crown joint plate 122.

Next, a pair of female connecting portions 40 (first female connecting portion 40A and second female connecting portion 40B) recessed in the first top end joint plate 121 will be described. The first crown joint plate 121 is provided with opening holes 1212 at positions where a pair of female connecting portions 40 (first female connecting portion 40A and second female connecting portion 40B) are provided, respectively. A metal cylindrical casing 41 is fixed to the inner surface 121b by welding wp or the like. The casing 41 has its axis positioned substantially at the center of the opening hole 1212. A storage chamber 42 is formed in the casing 41. A tapered hole 43 having a tapered surface 43a whose inner diameter gradually decreases from the rear end side to the tip side is formed in the front portion (front portion) of the storage chamber 42. Further, a spring storage portion 42a is formed in the middle portion of the storage chamber 42, and a female screw 45 is engraved on the inner circumference of the rear portion of the storage chamber 42. Further, an insertion port 48 is formed at the tip of the tapered hole 43. The insertion port 48 located at the front end portion of the casing 41 has substantially the same diameter as the opening hole 1212 formed in the first top end joint plate 121, and communicates with the opening hole 1212. Further, the insertion port 48 is arranged at a position where it overlaps with the opening hole 1212 in a state where the casing 41 is fixed to the first top end joint plate 121.

Further, in the tapered hole 43, the divided female locking member 46 is slidably arranged in the axial direction. In the present embodiment, as shown in FIG. 11, a wedge-shaped female locking member 46 divided into three in the circumferential direction is slidably arranged in the axial (front-back) direction of the casing 41. .. FIG. 11 is a cross-sectional view taken along the line XX in FIG. Here, the outer surface of the female locking member 46 is formed as a tapered surface 46a that can slide along the tapered surface 43a in the tapered hole 43. The outer diameter of the tapered surface 46a of the female locking member 46 gradually increases from the tip side to the rear. Further, a female screw 46b is formed on the inner surface of each female locking member 46. The female screw 46b is a plurality of female-side locking grooves in the circumferential direction arranged side by side on the inner surface of each female locking member 46. The female screw 46b is an arc centered on the axis of the casing 41 and is engraved in the direction along the axis. From the above, a female screw hole is formed by the plurality of female locking members 46, and the tapered surface 46a of each female locking member 46 retracts along the tapered surface 43a of the tapered hole 43, whereby the female screw is formed. The diameter of the hole is expanded, and the female screw hole is reduced in diameter by moving forward (toward). The female screw 46b formed on the inner surface of each female locking member 46 can be meshed with the male screw 51c formed on the outer peripheral portion on the tip end side of the male locking member 51.

Further, in the spring storage portion 42a of the storage chamber 42, a pressing spring 44, which is a pressing member for pressing (elastically urging) the female locking member 46 forward (frontward), is provided after each female locking member 46. It is housed in a compressed state between the spring receiver 47 provided at the end and the lid plate 49, and each female locking member 46 is constantly pressed forward by the pressing force of the pressing spring 44. The lid plate 49 can hold the pressing spring 44 in a compressed state by being screwed onto the female screw 45 engraved on the rear inner peripheral side of the storage chamber 42. A hexagonal hole 49a is provided on the outer surface of the lid plate 49, and the lid plate 49 can be detached from the casing 41 by a hexagon wrench.

In the female connecting portion 40 and the male connecting portion 50 configured as described above, the female screw 46b formed on the inner surface of each female locking member 46 and the outer peripheral portion of the male locking member 51 are formed. The male screw 51c is formed so that the screw pitch is smaller than the pitch of the fine screw specified in JIS. Further, in the female connecting portion 40 of the present embodiment, the spiral female screw 46b is formed on the inner surface of each female locking member 46, but instead of the female screw 46b, the circumferential direction of each female locking member 46 is formed. Parallel grooves may be provided on the inner surface of each female locking member 46 in which annular peaks and annular valleys extending in parallel are arranged alternately and in parallel. Similarly, in the male type connecting portion 50, instead of the male screw 51c formed on the outer peripheral portion of the male type locking member 51, an annular mountain portion and an annular valley portion extending in the circumferential direction of the male type locking member 51 Parallel grooves may be provided on the outer peripheral surface of the male locking member 51 in which parallel grooves are arranged alternately and in parallel.

Next, the connection of the left split support 10L and the right split support 10R will be described. When connecting the left split support 10L and the right split support 10R, first, the elector device 100 grips the left split support 10L on the left hand 18L and the right split support 10R on the right hand 18R. Next, the elector device 100 appropriately extends and tilts the left boom 17L and the right boom 17R, and rotates the left hand 18L and the right hand 18R to make the left split support 10L and the right split support 10R the tunnel axis. Move them so that they are orthogonal to each other. Each boom 17L, 17R in the Elekta device 100
The hands 18L and 18R can be driven by operating the operation panel 104.

12A to 12C are diagrams illustrating a situation in which the first top end joint plate 121 and the second top end joint plate 122 are joined when the left side split support 10L and the right side split support 10R are connected. In FIGS. 12A to 12C, the planar positional relationship between the first top end joint plate 121 and the second top end joint plate 122 is shown in the upper stage, and the first top end joint plate 121 and the second top end joint plate 122 are shown in the lower stage. The separation position relationship of is shown. The erector device 100 relatively moves a pair of hands 18L and 18R while holding the left side split support 10L and the right side split support 10R to move the first top joint plate 121 and the second top joint plate 122. The outer surfaces 121a and 122a are arranged in the "initial state at the time of joining the top plate" shown in FIG. 12A in which the outer surfaces 121a and 122a are close to each other and face each other (opposite). The planar relative positional relationship between the first crown joint plate 121 and the second crown joint plate 122 in the initial state at the time of joining the crown plate is above the first crown joint plate 121 in the height direction in the tunnel. The upper edge 122c of the second crown joint plate 122 is slightly lower than the edge 121c (that is, the second crown joint plate 122 is located on the inner air side), and the first crown is in the tunnel axial direction. The second side edge 122f of the second top end joint plate 122 is arranged slightly in front of the second side edge 121f of the joint plate 121 (a position closer to the elector device 100).

From the initial state at the time of joining the top plate shown in FIG. 12A, as shown in FIG. 12B, the height of the upper edge 122c of the second top joint plate 122 coincides with the upper edge 121c of the first top joint plate 121. The position of the second side edge 122f of the second top end joint plate 122 coincides with the second side edge 121f of the first top end joint plate 121 in the tunnel axial direction, and the outer surface of the first top end joint plate 121 The first crown joint plate 121 and the second crown joint plate 122 are relatively close to each other so as to narrow the separation distance between the 121a and the outer surface 122a of the second crown joint plate 122. In other words, the first top end joint plate 121 and the second top end joint plate 122 are relatively close to each other so that the second top end joint plate 122 overlaps the first contact region portion 1211 of the first top end joint plate 121. Let me do it. At that time, for example, by driving the right hand 18R that grips the right split support 10R while the position of the left hand 18L that grips the left split support 10L is fixed, the first crown joint plate 121 is subjected to. The second top joint plate 122 may be gradually brought closer to each other.

As described above, in the first top end joint plate 121, the side edge guide plate 1213 is provided on the second side edge 121f, and the upper edge guide plate 1214 is provided on the upper edge 121c. Therefore, the upper edge 122c and the second side edge 122f of the second top end joint plate 122 come into contact with the side edge guide plate 1213 and the upper edge guide plate 1214 of the first top end joint plate 121, respectively, so that the first heaven can be reached. The planar positioning of the second top end joint plate 122 with respect to the end joint plate 121 is completed, the upper edge 122c of the first top end joint plate 121 overlaps with the upper edge 122c of the second top end joint plate 122, and the first heaven The second side edge 122f of the second top end joint plate 122 overlaps the second side edge 121f of the end joint plate 121. In other words, the second crown joint plate 122 is planarly overlapped with the first contact region portion 1211 of the first crown joint plate 121. Hereinafter, this state is referred to as a "positioning completed state".

Here, when the side edge guide plate 1213 of the first top end joint plate 121 comes into contact with the second side edge 122f of the second top end joint plate 122, the first male mold with respect to the first female mold connecting portion 40A. The lateral position of the connecting portion 50A and the lateral position of the second male connecting portion 50B with respect to the second female connecting portion 40B are configured to be aligned with each other. Further, the upper edge guide plate 1214 of the first top end joint plate 121 has a first male type connection portion 50A with respect to the first female type connection portion 40A when the upper edge 122c of the second top end joint plate 122 comes into contact with the upper edge guide plate 1214. Is configured to match the height position of the second male type connecting portion 50B with respect to the second female type connecting portion 40B. That is, in the positioning completed state in which the upper edge 122c and the second side edge 122f of the second top end joint plate 122 are in contact with the side edge guide plate 1213 and the upper edge guide plate 1214 of the first top end joint plate 121, respectively. , 1st top joint plate 12
The second top joint plate 122 is planarly overlapped with the first contact region portion 1211 of No. 1, and at the same time, the first female type connecting portion 40A and the first male type connecting portion 50A, and the second female type connecting portion 40B and the first The two male connecting portions 50B are in a state of overlapping in a plane.

Therefore, from the positioning completed state shown in FIG. 12B, the first crown joint plate 121 and the second crown joint plate are brought closer to each other in the direction in which the outer surface 121a of the first crown joint plate 121 and the outer surface 122a of the second crown joint plate 122 are approached. By moving the 122 relative to each other, as shown in FIG. 12C, the opening hole 1212 corresponding to the first female connection portion 40A of the first top joint plate 121 has the first male connection portion in the second top joint plate 122. The male locking member 51 of 50A is the second male connecting portion 50B of the second crown joint plate 122 with respect to the opening hole 1212 corresponding to the second female connecting portion 40B of the first crown joint plate 121. The male locking member 51 is inserted respectively.

Here, with reference to FIG. 10, the connection of the first female type connecting portion 40A and the first male type connecting portion 50A, the second female type connecting portion 40B, and the second male type connecting portion 50B will be described. In the present embodiment, the outer diameter of the male locking member 51 is slightly smaller than the opening hole 1212 of the first top joint plate 121 and the insertion port 48 of the female connecting portion 40 (casing 41), and each of them. With the female locking member 46 arranged at the most advanced position of the tapered hole 43 (tapered surface 43a), the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. ing. When the male locking member 51 projecting from the second crown joint plate 122 enters through the opening hole 1212 of the first crown joint plate 121 from the insertion port 48 of the female connecting portion 40, the pressing spring 44 is pushed. The tip portion 51d of the male locking member 51 comes into contact with the front end surface 46c of each female locking member 46 positioned at the most advanced position of the tapered hole 43 (tapered surface 43a) at the front end portion by pressure. Then, the male locking member 51 opposes the pressing force of the pressing spring 44 and directs each female locking member 46 along the tapered surface 43a to the rear in the axial direction of the female connecting portion 40 (casing 41). The male locking member 51 is inserted into the storage chamber 42 while expanding the diameter of the female screw hole formed by the female screw 46b on the tapered surface 46a of each female locking member 46.

Then, the outer surface 121a of the first top end joint plate 121 and the outer surface 122a of the second top end joint plate 122 come into surface contact with each other, and the male locking member in the storage chamber 42 in the female connecting portion 40 comes into contact with each other. When the insertion of the male locking member 51 is stopped and the insertion of the male locking member 51 into the storage chamber 42 is stopped, each female locking member 46 is moved forward by the pressing force of the pressing spring 44. ), And the female screw hole formed by the tapered surface 46a of each female locking member 46 is reduced in diameter. As a result, as shown in FIG. 13, the female screw 46b (female side locking groove) of each female locking member 46 in the female connecting portion 40 and the male screw of the male locking member 51 in the male connecting portion 50. 51c (male side locking groove) mesh with each other. As a result, the first contact region portion 1211 of the first top end joint plate 121 and the second top end joint plate 122 are joined in a surface contact state (normal contact state). As a result, the arch-shaped tunnel support 10 is formed by the interconnected left split support 10L and right split support 10R.

Here, as shown in FIG. 13, the first crown joint plate is in a state where the female screw 46b of the female connecting portion 40 and the male screw 51c of the male connecting portion 50 (male locking member 51) are meshed with each other. When an external force acts in the direction of separating the 121 and the second crown joint plate 122, the pulling force acts in the direction of pulling out the male locking member 51 from the storage chamber 42 in the female connecting portion 40. This pulling force is transmitted to each female locking member 46 via the male screw 51c and the female screw 46b that mesh with each other. By the way, the outer diameter of the tapered surface 46a of each female locking member 46 gradually decreases from the rear side to the front side. Therefore, even if the pull-out force acts on each female locking member 46, the displacement of each female locking member 46 toward the front of the tapered hole 43 is restricted. That is, according to the connecting structure 30 according to the present embodiment, even if an external force acts in the direction of pulling out the male locking member 51 from the storage chamber 42 of the female connecting portion 40, the connecting state is maintained against the external force. Can be maintained. That is, according to the connection structure 30 in the embodiment, only the operation of inserting the male connection portion 50 (male locking member 51) from the insertion port 48 of the female connection portion 40 with respect to the female connection portion 40. Since the male connecting portion 50 is connected, the left split support 10L and the right split support 10R can be easily joined together. Further, even if a pulling force acts in the direction of pulling out the male locking member 51 from the storage chamber 42 in the female connecting portion 40, the connection between the female connecting portion 40 and the male connecting portion 50 is suppressed. can.

As described above, the female connecting portion 40 recessed in the first top joint plate 121 of the left split support 10L and the male mold projected in the second top joint plate 122 of the right split support 10R. The connecting portion 50 (male locking member 51) functions as a one-touch joint that is connected with one touch by hand operation of the elector device 100. Further, according to the connection structure 30 of the left side split support 10L and the right side split support 10R in the present embodiment, the first top end joint plate 121 includes the side edge guide plate 1213 and the upper edge guide plate 1214. It is possible to easily align the first female connecting portion 40A and the first male connecting portion 50A to be interconnected, and the second female connecting portion 40B and the second male connecting portion 50B.

Further, in the connecting structure 30 in the present embodiment, the first crown joint plate 121 is an obstruction plate portion 1210 as a misconnection suppressing structure for suppressing the misconnection of the second male connecting portion 50B to the first female connecting portion 40A. have. As shown in FIG. 8A, the baffle plate portion 1210 is in a region outside the width direction of the first female connecting portion 40A of the first crown joint plate 121, and the first crown joint plate 121 is in normal contact with the first crown joint plate 121. It is formed by projecting outward in the lateral width direction from the first contact region portion 1211 that abuts on the second top joint plate 122 in the state. Hereinafter, the operation of the obstruction plate portion 1210 on the first top end joint plate 121 will be described.

Here, FIG. 14 shows the second top joint plate with respect to the first female connecting portion 40A in the first top joint plate 121 when the left split support 10L and the right split support 10R according to the first embodiment are connected. It is a figure explaining the situation which suppresses the erroneous connection of the 2nd male type connection part 50B in 122. The upper part of FIG. 14 shows the planar positional relationship between the first top end joint plate 121 and the second top end joint plate 122, and the lower part shows the separation positional relationship between the first top end joint plate 121 and the second top end joint plate 122. Is shown. In the state shown in FIG. 14, a state in which the plane positions of the first female type connecting portion 40A and the second male type connecting portion 50B coincide with each other is shown. For example, it is not easy to perform the hand operation of the erector device 100 with high accuracy, and when the first top end joint plate 121 and the second top end joint plate 122 are joined, the state shown in FIG. 14 may shift. Well thought out. Then, when the second male connecting portion 50B is erroneously inserted and locked with respect to the first female connecting portion 40A, the erroneously connected second male connecting portion 50B is first inserted. After removing from the female type connecting portion 40A, the connection work of the left split support 10L and the right split support 10R must be redone, which causes inconveniences such as an increase in unnecessary work load and a delay in the work process. There is a risk. In particular, since the connecting structure 30 in the present embodiment is locked with one touch when the male locking member 51 is inserted into the female connecting portion 40, the above-mentioned inconvenience is likely to become apparent.

On the other hand, according to the connecting structure 30 in the present embodiment, as shown in FIG. 14, the first female connecting portion 40A in the first crown joint plate 121 and the second male in the second crown joint plate 122. Even if the plane positions of the mold connecting portions 50B overlap, the first male type connecting portion 50A of the second top end joint plate 122 is in a state of facing the obstruction plate portion 1210 of the first top end joint plate 121. ing. Therefore, in the state shown in FIG. 14, even if the second top end joint plate 122 tries to approach the first top end joint plate 121 from this state, the obstruction plate portion 1210 of the first top end joint plate 121 The tip of the male locking member 51 in the first male connecting portion 50A abuts and interferes with the first male connecting portion 50A to prevent the second crown joint plate 122 from approaching the first crown joint plate 121. Can be done. That is, it is possible to prevent the second male connecting portion 50B from being erroneously inserted and locked with respect to the first female connecting portion 40A of the first top end joint plate 121.

From the above, according to the connection structure 30 in the present embodiment, since the obstruction plate portion 1210 is provided on the first top end joint plate 121, the second male type connection portion 50B is erroneously assembled with the first female type connection portion 40A. The first female connecting portion 40A, which is a regular connection target for the first male connecting portion 50A and the second male connecting portion 50B, respectively, by the side edge guide plate 1213 and the upper edge guide plate 1214 while easily suppressing the attachment. By guiding the second female connecting portion 40B, it is possible to easily realize the connection between the regular connecting portions. As a result, it is possible to suppress inconveniences such as an increase in unnecessary work load and a delay in the work process due to erroneous connection of the male connection portion 50 to the female connection portion 40.

In the present embodiment, the drive operation of each hand 18L and 18R at the time of connecting the left split support 10L and the right split support 10R is the operation of the target 9 attached to the left split support 10L and the right split support 10R, respectively. It may be performed based on the survey data obtained by surveying the position from a known coordinate point.

For example, the elector controller 102 wirelessly remotely controls the total station 300 via the total station controller 400, automatically tracks each target 9 (first target 9a to fourth target 9d), and sequentially automatically measures the coordinates of each target 9. do. Here, the total station 300 is installed at a coordinate known point (x0, y0, z0). By irradiating a laser beam from the total station 300 installed at a known coordinate point in this way to collimate each target 9 and perform distance measurement and angle measurement, the position coordinates of the first target 9a to the fourth target 9d ( x1, y1, z1), (x2, y2, z2), (x3, y3, z3), (x4, y4, z4) can be obtained. Then, the survey data including the position coordinates of each target 9 is sequentially wirelessly transmitted from the total station controller 400 side to the elector controller 102. The erector controller 102 sets the respective drive amounts for relative movement of the hands 18L and 18R based on the survey data of each target 9 acquired from the total station 300, and as described above, the first of the left side split support 10L. The crown joint plate 121 and the second crown joint plate 122 of the right side split support 10R can be integrally joined.

The movement amount of the hands 18L and 18R set by the elector controller 102 is displayed on the monitor 101. The total station 300 in this embodiment can automatically track and collimate each target 9. Therefore, the amount of movement of each hand 18L, 18R required to interconnect the top ends of the left split support 10L and the right split support 10R by operating the hands 18L, 18R is displayed in real time on the monitor 101. The operator can easily connect the left split support 10L and the right split support 10R by sequentially operating the operation panel 104 while looking at the monitor 101. For the operation of the hands 18L and 18R here, the drive mechanism of the hands 18L and 18R is operated to directly operate the hands 18L and 18R, and the boom 17L to which the hands 18L and 18R are attached are attached. It also includes indirectly manipulating the hands 18L and 18R by driving the hands 18L and 17R.

After assembling the tunnel support 10 in an arch shape as described above, the elector device 100 drives the hands 18L and 18R to arrange the tunnel support 10 at a predetermined built-in position in the vicinity of the face 8 (support). Construction process). For example, the erector controller 102 has the positions of the first target 9a to the fourth target 9d based on the survey data including the coordinate positions of the targets 9 (first target 9a to fourth target 9d) acquired from the total station 300. May be displayed on the monitor 101. Further, the monitor 101 may display the target positions of the first target 9a to the fourth target 9d in addition to the respective positions of the first target 9a to the fourth target 9d. The operator who operates the elector device 100 can arrange the tunnel support 10 at the regular built-in position by driving the booms 17L and 17R and the hands 18L and 18R while looking at the monitor 101.

Here, after the tunnel support 10 (left side split support 10L and right side split support 10R) is placed at a predetermined built-in position on the face 8, the tunnel support 10 (left side) is placed on each of the hands 18L and 18R of the elector device 100. While holding (holding) the split support 10L and the right split support 10R), the leg 111d of the left split support 10L and the leg 112d of the right split support 10R (from the spray nozzle 603 of the spraying device 600). (See FIG. 1) and the surrounding tunnel wall surface (primary sprayed concrete layer 3) is sprayed with secondary sprayed concrete to temporarily fix the tunnel support 10 to the tunnel wall surface (temporary fixing step). ).

After temporarily fixing the tunnel support 10 to the tunnel wall surface as described above, the tunnel support 10 is released from being gripped by the hands 18L and 18R of the elector device 100 (grasping release step). Then, next, the secondary sprayed concrete is sprayed between the new tunnel support 10 and the existing tunnel support 10 (new section) adjacent to the axial direction of the tunnel T, and the new tunnel support 10 is used. By embedding the entire length direction in the secondary sprayed concrete, the newly constructed tunnel support 10 is fixed to the tunnel pit wall surface (primary sprayed concrete layer 3) (spraying process). As a result, the secondary sprayed concrete layer 6 having a predetermined thickness is formed on the inner air side of the primary sprayed concrete layer 3. In the spraying step, the secondary sprayed concrete is sprayed to a thickness substantially reaching the inner air side flanges 111c and 112c in the tunnel support 10. Next, one cycle of the construction of the tunnel T is completed by driving the lock bolt into the ground 7 through the secondary sprayed concrete layer 6 and the primary sprayed concrete layer 3.

As described above, according to the method for constructing the tunnel T in the present embodiment, the left side split support 10L and the right side split support 10R are held by the pair of hands 18L and 18R in the elector device 100, and the hands 18L and 18R are held. By driving, the female connecting portion 40 recessed in the first crown joint plate 121 and the male connecting portion 50 projecting in the second crown joint plate 122 are engaged with each other, and the left side split support 10L is engaged. And the top joint plate of the right side split support 10R can be connected in an arch shape. According to this, as in the past, personnel are placed on the work scaffolding built near the face, the man cage of the elector device, etc., and the personnel are moved to the vicinity of the top of the tunnel to reach the top of the pair of steel supports. Since it is not necessary to perform manual work near the face such as fastening the joint plates to each other with bolts and nuts, safety and workability can be improved as compared with the conventional case. Further, according to the connecting structure 30 of the tunnel support 10 in the present embodiment, the female connecting portion 50 (male locking member 51) is simply inserted from the insertion port 48 of the female connecting portion 40. Since the male type connecting portion 50 can be engaged with the mold connecting portion 40, the left side split support work 10L and the right side split support work 10R can be easily connected in a shorter time.

Further, according to the method for constructing the tunnel T in the present embodiment, the left split support 10L and the right split support 10R are held by the pair of hands 18L and 18R of the elector device 100 mounted on the work vehicle 200. By spraying sprayed concrete from the spray nozzle 603 of the attachment device 600, the left split support 10L and the right split support 10R can be temporarily fixed at the regular building position, so that the tunnel T can be temporarily fixed as in the conventional case. It is possible to omit the step of connecting the tunnel support works 10 adjacent to each other in the axial direction with a connecting material. According to this, it is not necessary to allocate personnel to the work platform built near the face or the man cage of the elector device to install the connecting material, so that the safety and workability of the tunnel T can be improved more than before. Can be improved.

Further, as shown in FIG. 10, the tip portion 51d of the male locking member 51 is formed with a tapered surface 51e whose diameter is reduced toward the tip. Therefore, during the support connection step of connecting the left split support 10L and the right split support 10R (female type connecting part 40 and male type connecting part 50), the insertion port 48 of the female type connecting part 40 and the male type are connected. Even if the center position of the locking member 51 is relatively slightly displaced, the tapered surface 51e of the male locking member 51 is slid along the edge of the opening hole 1212 of the first top end joint plate 121. Therefore, the male locking member 51 can be guided in the direction in which the amount of misalignment between the insertion port 48 and the center of the male locking member 51 in the female connecting portion 40 is reduced. That is, when the left split support 10L and the right split support 10R (female connecting portion 40 and male connecting portion 50) are connected by providing the tapered surface 51e on the tip portion 51d of the male locking member 51. Even if the plane positions of the female connecting portion 40 and the male locking member 51 are slightly displaced, the male locking member 51 can be smoothly guided to the insertion opening 48 of the female connecting portion 40. .. The details of the tapered surface 51e formed on the tip portion 51d of the male locking member 51 can be appropriately changed. For example, the tip portion 51d of the male locking member 51 may be formed in a conical shape. In this case, the side surface of the conical shape is formed as a tapered surface 51e.

<Modification example>
FIG. 15 is a diagram illustrating a connection structure 30 according to a modified example of the first embodiment. The opening hole 1212 formed in the first crown joint plate 121 according to this modification has a tapered surface 1215 whose diameter increases from the inner surface 121b to the outer surface 122a in the thickness direction of the first crown joint plate 121. .. In this way, by forming the opening hole 1212 of the first top end joint plate 121, when the left side split support 10L and the right side split support 10R (female type connecting part 40 and male type connecting part 50) are connected. Even if the insertion port 48 of the female connecting portion 40 and the center position of the male locking member 51 are slightly displaced from each other, the tapered surface 1215 in the opening hole 1212 of the first top joint plate 121 is engaged with the male mold. By sliding the stop member 51, the male locking member 51 can be guided in a direction in which the amount of misalignment between the center of the insertion port 48 and the male locking member 51 in the female connecting portion 40 becomes smaller. .. According to this, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connecting portion 40.

<Embodiment 2>
Next, the second embodiment of the present invention will be described. FIG. 16A is a front view of the first top end joint plate 121A according to the second embodiment. FIG. 16B is a side view of the first top end joint plate 121A according to the second embodiment. The left side split support 10L in the second embodiment is different from the first crown joint plate 121 according to the first embodiment only in the structure of the first crown joint plate 121A. Further, the right side split support 10R in the second embodiment has the same structure as the first embodiment. Hereinafter, the first top end joint plate 121A will be mainly described. Further, in the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals.

The first crown joint plate 121A shown in FIGS. 16A and 16B has the entire plane region formed as the first contact region portion 1211 and does not have the obstruction plate portion 1210. The planar shape of the first top end joint plate 121A has a square shape congruent with the second top end joint plate 122, and the vertical and horizontal dimensions of the first top end joint plate 121A are the second top, respectively. The dimensions are equal to the vertical and horizontal dimensions of the end joint plate 122. The first crown joint plate 121A and the second crown joint plate 122 are connected to the first female connecting portion 40A and the second female connecting portion 40B with the first male connecting portion 50A and the second male connecting portion 50A. By connecting the portions 50B respectively, the entire outer surface 121a in the first contact region portion 1211 just overlaps with the entire outer surface 122a of the second top end joint plate 122, and is joined in a state where a normal contact state is obtained. ..

As shown in FIGS. 16A and 16B, the first top end joint plate 121A is provided with a guide plate portion 1216 on the upper edge 121c instead of the upper edge guide plate 1214. The guide plate portion 1216 is a plate member having an L-shaped cross section, which is projected from the upper edge 121c of the first top end joint plate 121A toward the front of the first top end joint plate 121A. In the present embodiment, the guide plate portion 1216 corresponds to the baffle plate portion. Further, in the first top end joint plate 121A in the present embodiment, the side edge guide plate 1213 is provided on the second side edge 121f as in the first embodiment. As shown in FIGS. 16A and 16B, the side edge guide plate 1213 has a rectangular flat plate plate shape as in the first embodiment, and is the second side edge 121f of the first top end joint plate 121. Of these, it is provided near the central portion in the height direction of the first top end joint plate 121.

The guide plate portion 1216 is provided along the upper edge 121c of the first top end joint plate 121A, and the side end is located on the first female connecting portion 40A side of the first top end joint plate 121A. The guide wall portion 1216a extending outward from the side edge 121e in the width direction and the guide wall portion 1216a are extended downward from the lateral end and the first side of the first top end joint plate 121A. It has an interference wall portion 1216b which is arranged so as to face the edge 121e at a distance. Here, of the guide wall portion 1216a, the side end located on the opposite side to the interference wall portion 1216b is located near the central portion of the upper edge 121c of the first top end joint plate 121.

FIG. 17 shows a second male type connecting portion in the second top joint plate 122 with respect to the first female type connecting portion 40A in the first top end joint plate 121A when the left side split support 10L and the right side split support 10R are connected. It is a figure explaining the state which suppresses the erroneous connection of 50B. In the state shown in FIG. 17, the upper edge 122c of the second top end joint plate 122 and the lower edge of the interference wall portion 1216b of the guide and obstruction plate portion 1216 provided on the upper edge 121c of the first top end joint plate 121A. It is in contact. In this way, the state in which the interference wall portion 1216b of the guide plate portion 1216 abuts on the upper edge 122c of the second top end joint plate 122 and interferes with the guide plate portion 1216 is referred to as a "misconnection suppression state". In the erroneous connection suppression state, as shown in FIG. 17, the female connection portion 40 (first female connection portion 40A and second female connection portion 40B) and the second top end of the first top end joint plate 121A. The height position of the male type connecting portion 50 (the first male type connecting portion 50A and the second male type connecting portion 50B) of the joint plate 122 is shifted up and down, so that the first female type connecting portion 40A is the first. 2 Misconnection of the male type connecting portion 50B is suppressed.

Then, from the misconnection suppression state shown in FIG. 17, when the upper edge 122c of the second top end joint plate 122 gets over the interference wall portion 1216b on the guide wall portion 1216a side of the guide plate portion 1216, the interference wall portion 1216b is shown in FIG. It shifts to the "guide contact state". This guide contact state is a state in which the upper edge 122c of the second top end joint plate 122 is in contact with the guide wall portion 1216a of the guide plate portion 1216.

In the guide contact state, as shown in FIG. 18, the height position of the first male type connecting portion 50A with respect to the first female type connecting portion 40A and the second male type connecting portion 50B with respect to the second female type connecting portion 40B. The height position of is matched. From this state, as shown in FIG. 19, the second side edge 122f of the second top end joint plate 122 is attached to the side edge guide plate 1213 projecting from the second side edge 121f of the first top end joint plate 121A. The second crown joint plate 122 is relatively moved with respect to the first crown joint plate 121A until the contact is made. When the second side edge 122f of the second top end joint plate 122 abuts on the side edge guide plate 1213, the lateral position of the first male type connecting portion 50A with respect to the first female type connecting portion 40A and the second female type connecting portion The lateral position of the second male type connecting portion 50B with respect to 40B is in the same state.

In the present embodiment, the guide plate portion 1216 also serves as a guide so that the guide contact state is maintained even when the second side edge 122f of the second top end joint plate 122 is in contact with the side edge guide plate 1213. The guide wall portion 1216a of the above is installed. That is, in the state shown in FIG. 19, the upper edge 122c of the second top end joint plate 122 abuts on the guide wall portion 1216a of the guide plate portion 1216, and the second side edge of the second top end joint plate 122. 122f is in contact with the side edge guide plate 1213. Hereinafter, this state is referred to as a "positioning completed state". In the positioning completed state shown in FIG. 19, the plane positions of the first male type connecting portion 50A match with the first female type connecting portion 40A, and the second male type connecting portion with respect to the second female type connecting portion 40B. The plane position of 50B is in the same state. Further, as shown in FIG. 19, the first top end joint plate 121A and the second top end joint plate 122 are in a state of being planarly overlapped with each other.

Therefore, the first crown joint plate 121 and the second crown joint plate in the direction in which the outer surface 121a of the first crown joint plate 121A and the outer surface 122a of the second crown joint plate 122 approach each other from the positioning completed state shown in FIG. By moving the 122 relative to each other, the second female connecting portion 40B and the second male connecting portion 50B can be easily connected to the first female connecting portion 40A and the first male connecting portion 50A. That is, the first crown joint plate 121A of the left split support 10L and the second crown joint plate 122 of the right split support 10R can be easily joined.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described. FIG. 20A is a front view of the first top end joint plate 121B according to the third embodiment. FIG. 20B is a side view of the first top end joint plate 121B according to the third embodiment. FIG. 21A is a front view of the second top end joint plate 122B according to the third embodiment. FIG. 21B is a side view of the second top end joint plate 122B according to the third embodiment. The left side split support 10L in the third embodiment differs from the first crown joint plate 121 according to the first embodiment only in the structure of the first crown joint plate 121B. Further, the right-side split support 10R in the third embodiment differs from the second crown joint plate 122 according to the first embodiment only in the structure of the second crown joint plate 122B. Hereinafter, the first crown joint plate 121B and the second crown joint plate 122B will be mainly described. Further, in the third embodiment, the same components as those in the first and second embodiments are designated by the same reference numerals.

Similar to the first crown joint plate 121A in the second embodiment, the first crown joint plate 121B shown in FIGS. 20A and 20B has the entire plane region formed as the first contact region portion 1211. Further, a guide plate portion 1217 is provided on the upper edge 121c of the first top end joint plate 121B. Here, the guide and baffle plate portion 1217 of the first top end joint plate 121B has a different shape from the guide and baffle plate portion 1216 in the second embodiment, and has a rectangular flat plate plate shape. The guide plate portion 1217 is projected from the upper edge 121c of the first top end joint plate 121B toward the front of the first top end joint plate 121B, and is projected from the left side split support 10L and the right side split support 10R. In order to prevent the second male type connecting portion 50B from being erroneously connected to the first female type connecting portion 40A by interfering with the upper edge of the second top end joint plate 122B at the time of connecting the guide plate portion 1217. It is a member of. In the present embodiment, the baffle plate portion 1217 that also serves as a guide corresponds to the baffle plate portion.

As shown in FIGS. 20A and 20B, the guide plate portion 1217 is located on the first side of the upper edge 121c of the first top end joint plate 121B, which is located on the side of the first female connecting portion 40A with respect to the central portion in the width direction. It is provided in a region close to the edge 121e. Specifically, one end of the guide plate portion 1217 is located at the center of the upper edge 121c in the lateral width direction, and the other end of the guide plate portion 1217 is connected to the first side edge 121e and the upper edge 121c. It is located in the middle portion between the corner portion C1 and the central portion of the upper edge 121c. Further, in the first top end joint plate 121B in the present embodiment, the side edge guide plate 1213 is provided on the second side edge 121f as in the first embodiment. The side edge guide plate 1213 has a rectangular flat plate shape as in the first and second embodiments, and of the second side edge 121f in the first top end joint plate 121B, the first top end joint plate 121 It is provided near the center in the height direction.

Next, with reference to FIGS. 21A and 21B, the second crown joint plate 122B according to the third embodiment will be described. When the second crown joint plate 122B is joined to the first crown joint plate 121B. In addition, the second contact region portion 1220 and the second contact region portion 1220, which are in contact with the first contact region portion 1211 in a surface contact state, and the second contact region portion 1211.
It has a protrusion upper edge portion 1221 projecting upward from the second contact region portion 1220 on the upper edge 122c of the top end joint plate 122B. The protrusion upper edge portion 1221 is provided in a region close to the second side edge 122f located on the second male type connecting portion 50B side of the upper edge 122c of the second top end joint plate 122B in the lateral width direction. More specifically, the protrusion upper edge portion 1221 is projected from the upper edge 122c of the second top end joint plate 122B in the vicinity of the corner portion C2 to which the upper edge 122c and the second side edge 122f are connected. ing.

FIG. 22 shows the second top joint plate 122B with respect to the first female type connecting portion 40A in the first top end joint plate 121B when the left side split support 10L and the right side split support 10R according to the third embodiment are connected. It is a figure explaining the state which suppresses the erroneous connection of 2 male type connecting part 50B. In the state shown in FIG. 22, the protrusion upper edge portion 1221 provided at the corner portion C2 of the second top end joint plate 122B is provided on the upper edge 121c of the first top end joint plate 121B as a guide plate portion. It is in contact with 1217. In this way, the state in which the guide plate portion 1217 abuts on the protrusion upper edge portion 1221 of the second top end joint plate 122B and interferes with the guide plate portion 1217 is referred to as a “misconnection suppression state”. In the erroneous connection suppression state, as shown in FIG. 22, the female connection portion 40 (first female connection portion 40A and second female connection portion 40B) and the second top end of the first top end joint plate 121B. The height position of the male type connecting portion 50 (the first male type connecting portion 50A and the second male type connecting portion 50B) of the joint plate 122B is shifted up and down, so that the first female type connecting portion 40A is the first. 2 Misconnection of the male type connecting portion 50B is suppressed.

Then, when the protrusion upper edge portion 1221 of the second top end joint plate 122B gets over the guide combined obstruction plate portion 1217 from the misconnection suppression state shown in FIG. 22, the state shifts to the “guide contact state” shown in FIG. 23. In this guide contact state, of the upper edge 122c of the second top joint plate 122B, the non-protruding upper edge portion 1221a on which the protrusion upper edge portion 1221 is not formed is in contact with the guide and obstruction plate portion 1217. be.

In the guide contact state, as shown in FIG. 23, the height position of the first male type connecting portion 50A with respect to the first female type connecting portion 40A and the second male type connecting portion 50B with respect to the second female type connecting portion 40B. The height position of is matched. From this state, as shown in FIG. 24, the second side edge 122f of the second top end joint plate 122B is attached to the side edge guide plate 1213 projecting from the second side edge 121f of the first top end joint plate 121B. The second crown joint plate 122B is relatively moved with respect to the first crown joint plate 121B until the contact is made. When the second side edge 122f of the second top end joint plate 122B comes into contact with the side edge guide plate 1213, the lateral position of the first male type connecting portion 50A with respect to the first female type connecting portion 40A and the second female type connecting portion The lateral position of the second male type connecting portion 50B with respect to 40B is in the same state.

In the present embodiment, even when the second side edge 122f of the second top end joint plate 122 is in contact with the side edge guide plate 1213, the non-protruding upper edge portion 1221a of the second top end joint plate 122B is also used as a guide. The guide plate portion 1217 is provided so as to maintain the guide contact state realized by the contact of the baffle plate portion 1217. That is, in the state shown in FIG. 24, the non-protruding upper edge portion 1221ac of the second top end joint plate 122B is in contact with the guide and obstruction plate portion 1217, and the second side edge 122f of the second top end joint plate 122B is in contact with the guide plate portion 1217. It is in contact with the side edge guide plate 1213. Hereinafter, this state is referred to as a "positioning completed state". In the positioning completed state shown in FIG. 24, the plane positions of the first male type connecting portion 50A match with the first female type connecting portion 40A, and the second male type connecting portion with respect to the second female type connecting portion 40B. The plane position of 50B is in the same state. Further, as shown in FIG. 24, the first top end joint plate 121A and the second top end joint plate 122 are in a state of being planarly overlapped with each other.

Therefore, from the positioning completed state shown in FIG. 24, the first crown joint plate 121B and the second crown joint plate 121B and the second crown joint plate are brought closer to each other in the direction in which the outer surface 121a of the first crown joint plate 121B and the outer surface 122a of the second crown joint plate 122B are approached. By moving 122B relative to each other, the second female connecting portion 40B and the second male connecting portion 50B can be easily connected to the first female connecting portion 40A and the first male connecting portion 50A. That is, the first crown joint plate 121B of the left split support 10L and the second crown joint plate 122B of the right split support 10R can be easily joined.

Although the embodiments and modifications of the present invention have been described above, the connecting structure of the split support according to the present invention is not limited to these, and these can be combined as much as possible.

1 ... Tunnel support structure 3 ... Primary spray concrete layer 6 ... Secondary spray concrete layer 7 ... Ground 8 ... Face 10 ... Tunnel support 10L ... Left split Support work 10R ... Right split support work 40 ... Female type connection part 40A ... First female type connection part 40B ... Second female type connection part 50 ... Male type connection part 50A ... 1st male type connecting part 50B ... 2nd male type connecting part 51 ... Male type locking member 121 ... 1st top end joint plate 122 ... 2nd top end joint plate 1210 ... Board

Claims (8)

It is a connecting structure for connecting a pair of arc-shaped split supports that form an arch-shaped tunnel support built along the tunnel wall.
The first top end joint plate and the second top end joint plate, which are provided at the top ends of the pair of split supports and come into contact with each other when the pair of split supports are connected,
A first female type connecting portion and a second female type connecting portion recessed in parallel in the lateral width direction of the first top end joint plate in the first top end joint plate ,
The first male type connecting portion and the second male type connecting portion, which are convexly provided on the second top end joint plate in parallel in the lateral width direction of the second top end joint plate ,
Equipped with
In the first crown joint plate and the second crown joint plate, the first male type connecting portion is connected to the first female type connecting portion, and the second male type connecting portion is connected to the second female type connecting portion. By connecting the connecting parts, they are joined in a predetermined normal contact state, and they are joined.
The obstruction plate portion for suppressing erroneous connection of the second male type connecting portion to the first female type connecting portion is perpendicular to the upper edge of the first top end joint plate and from the outer surface of the first top end joint plate. Protruded in the direction away from the
The second crown joint plate protrudes upward from the second contact region portion that abuts on the upper edge of the second crown joint plate when the second crown joint plate is in the normal contact state. The upper edge of the protrusion to be installed is formed,
When the pair of split supports are connected, the baffle plate portion interferes with the protrusion upper edge portion, so that erroneous connection of the second male type connecting portion to the first female type connecting portion is suppressed. ,
Connection structure of split support. The obstruction plate portion is provided along the upper edge of the first top end joint plate and has a lateral width wider than the side edge of the first top end joint plate located on the side of the first female connecting portion. A guide wall portion extending to the outside of the direction and a guide wall portion extending downward from the side end of the guide wall portion and on the first female type connecting portion side of the first top end joint plate. It has side edges that are located and interference walls that are spaced apart from each other.
When connecting the pair of split support works, the upper edge of the second top joint plate interferes with the lower edge of the interference wall portion, so that the second male type connecting portion with respect to the first female type connecting portion By suppressing the erroneous connection of the above and the upper edge of the second top joint plate coming into contact with the guide wall portion, the height position of the first male type connecting portion with respect to the first female type connecting portion and the said The height position of the second male type connecting part with respect to the second female type connecting part is aligned.
The connection structure of the split support according to claim 1 . The protrusion upper edge portion is provided in a region closer to the side edge located on the side of the second male type connecting portion than the lateral central portion of the upper edge of the second top end joint plate.
The obstruction plate portion is provided in a region closer to the side edge located on the side of the first female mold connecting portion than the central portion in the lateral width direction on the upper edge of the first top end joint plate.
The connecting structure of the split support according to claim 1 or 2 . When connecting the pair of split supports, the baffle plate portion is in contact with the non-projection upper edge portion of the upper edge of the second top end joint plate on which the protrusion upper edge portion is not formed. Also serves as a guide portion for matching the height position of the first male type connecting portion with respect to the first female type connecting portion and the height position of the second male type connecting portion with respect to the second female type connecting portion. ,
The connection structure of the split support according to any one of claims 1 to 3 . A side edge guide plate projects from the side edge of the first crown joint plate located on the side of the second female connecting portion in a direction perpendicular to the outer surface of the first crown joint plate. Has been
When connecting the pair of split support works, the side edge of the second top joint plate located on the side of the second male type connecting portion comes into contact with the side edge guide plate, whereby the first female mold is formed. The lateral position of the first male type connecting portion with respect to the connecting portion and the lateral position of the second male type connecting portion with respect to the second female type connecting portion are aligned.
The connection structure of the split support according to any one of claims 1 to 4 . Each of the first male type connecting portion and the second male type connecting portion has a rod-shaped male type locking member protruding from the second top end joint plate.
Each of the first female connecting portion and the second female connecting portion communicates with the opening hole formed through the first top end joint plate and inserts the male locking member. A casing having a storage chamber internally in which a possible insertion slot is formed, and the male locking member inserted into the storage chamber from the insertion slot.
The connection structure of the split support according to any one of claims 1 to 5 . The opening hole has a tapered surface whose diameter increases from the inner surface side to the outer surface side in the thickness direction of the first top end joint plate.
The connection structure of the split support according to claim 6 . A tapered surface whose diameter is reduced toward the tip is formed at the tip of the male locking member.
The connecting structure of the split support according to claim 6 or 7 .

Images