JP6969061B2 - 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. By making the diameter of the male connecting part larger than the diameter of the insertion port in the female connecting part constituting the wrong combination, the misconnection of the female connecting part and the male connecting part is suppressed.

More specifically, the present invention is a connecting structure for connecting a pair of split support works divided in an arc shape, which forms an arch-shaped tunnel support work 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 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 first female type connecting portion has a first insertion port into which the first male type connecting portion can be inserted, and the first female type connecting portion has the first insertion port. The two female type connecting portion has a second insertion port into which the second male type connecting portion can be inserted, and the diameter of the first insertion port is smaller than the diameter of the second insertion port, and the first male The diameter of the mold connecting portion is smaller than the diameter of the second male connecting portion and the diameter of the first insertion port, and the diameter of the second male connecting portion is larger than the diameter of the first insertion port. It is smaller than the diameter of the second insertion slot.

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 side edge of the first top end joint plate located on the side of the second female type connecting portion has a side edge. A side edge guide plate is provided so as to project in a direction vertically separated from the outer surface of the first crown joint plate, and when connecting the pair of split support works, the second crown joint plate When the side edge located on the side of the second male type connecting portion comes into contact with the side edge guide plate, the lateral position of the first male type connecting portion with respect to the first female type connecting portion and the second female mold It may be configured so that the lateral position of the second male type connecting portion with respect to the connecting portion is aligned.

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, 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, and the first female. The mold connecting portion includes a casing having a storage chamber in which the first insertion opening is formed, and locks the male locking member inserted into the storage chamber from the first insertion opening, and the first. The two female connecting portion includes a casing having a storage chamber in which the second insertion opening is formed, and locks the male locking member inserted into the storage chamber from the second insertion opening. It may be configured in.

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 vehicle according to the first embodiment. FIG. 5 is a side view of the work vehicle according to the first embodiment. FIG. 6 is a diagram showing a mounting position of the target on 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. 12 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. 13A 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. 13B 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. 13C 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. 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.

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 a pair of arcuate split support 10L, 10R.
It is formed in an arch shape by integrally connecting the top ends (upper ends) of the above. 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 with respect to 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) on which the erector device 100 is mounted 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 (a point where the coordinates are known). 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 erector 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 on 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 right side split support 10R has a third target 9c and a fourth target 9d attached to its upper end and lower end, 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 air 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 the spray nozzle 603, rotate the spray nozzle 603, and the like. 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 side split support 10L and the right side split support 10R are gripped along the tunnel axis (tunnel extension direction) on each of 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 end 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 substantially square planar shape. Further, as shown in FIGS. 9A and 9B, the second top end joint plate 122 also has a substantially square planar shape like the first top end joint plate 121. The vertical dimensions of the first crown joint plate 121 and the second crown joint plate 122 are equal to each other, and the horizontal width dimensions are equal to each other. More specifically, the first top end joint plate 121 and the second top end joint plate 122 have upper edges 121c and 122c, lower edges 121d and 122d, first side edges 121e and 122e, and second side edges 121f, respectively. , 122f have the same dimensions.

A pair of female type connecting portions 40 (first female type connecting portion 40A and second female type connecting portion 40B) are recessed in the first top end joint plate 121 side by side in the lateral width direction of the first top end joint plate 121. Has been done. Further, on the second crown joint plate 122, a pair of male type connecting portions 50 (first male type connecting portion 50A and second male type connecting portion 50B) are arranged side by side in the lateral width direction of the second top end joint plate 122. It is convex. 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.

In the first top end joint plate 121, the first female mold connecting portion 40A is recessed in the first region A1, and the second female mold connecting portion 40B is recessed in the second region A2. The first region A1 is located on the first side edge 121e side of the plane region of the first top end joint plate 121 with the web 111a of the first main body portion 111 as a boundary, and also has a ground side flange 111b and an inner air side flange. The area surrounded by the 111c and the web 111a. The second region A2 is located on the second side edge 121f side of the plane region of the first top end joint plate 121 with the web 111a of the first main body portion 111 as a boundary, and also has a ground side flange 111b and an inner air side flange. The area surrounded by 111c and the web 111a. Further, as shown in FIG. 8A, the first male type connecting portion 50A is provided in the vicinity of the first side edge 121e, and the second female type connecting portion 40B is provided in the vicinity of the second side edge 121f. There is. In the first top end joint plate 121, the first female type connecting portion 40A and the second female type connecting portion 4
The 0Bs are arranged at the same height in the vertical direction of the first top end joint plate 121, and are arranged side by side along the lateral width direction of the first top end joint plate 121. That is, the arrangement directions of the first female type connecting portion 40A and the second female type connecting portion 40B in the first top end joint plate 121 coincide with the lateral width direction of the first top end joint plate 121.

Further, in the second top end joint plate 122, the first male type connecting portion 50A is projected in the third region A3, and the second male type connecting portion 50B is projected in the fourth region A4. The third region A3 is located on the first side edge 122e side of the plane region of the second top joint plate 122 with the web 112a of the second main body portion 112 as a boundary, and is located on the ground side flange 112b and the inner air side. The area surrounded by the flange 112c and the web 112a. The fourth region A4 is located on the second side edge 122f side of the plane region of the second top joint plate 122 with the web 112a of the second main body portion 112 as a boundary, and is located on the ground side flange 112b and the inner air side. The area surrounded by the flange 112c and the web 112a. Further, as shown in FIG. 9A, the first male type connecting portion 50A is provided in the vicinity of the first side edge 122e, and the second male type connecting portion 50B is provided in the vicinity of the second side edge 122f. There is. Further, in the second crown joint plate 122, the first male type connecting portion 50A and the second male type connecting portion 50B are arranged at the same height in the vertical direction of the second crown end joint plate 122, and the second The crown joint plates 122 are arranged side by side along the width direction. That is, the arrangement direction of the first male type connecting portion 50A and the second male type connecting portion 50B in the second top end joint plate 122 coincides with the lateral width direction of the second top end joint plate 122. Further, the distance between the centers of the first female connecting portion 40A and the second female connecting portion 40B in the lateral width direction of the first crown joint plate 121 is the first male connecting portion in the lateral width direction of the second crown joint plate 122. The dimensions are set to be equal to the distance between the centers of the portion 50A and the second male connecting portion 50B.

Further, although details will be described later, the first crown joint plate 121 and the second crown joint plate 122 in the present embodiment are the first female molds 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 the connecting portion 40A, and the second male type connecting portion 50B is connected to the second female type connecting portion 40B, whereby the first top end joint plate 121 and the second top end are connected. The joint plates 122 are joined to each other in a predetermined normal contact state. 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. Defined as a state.

When the first top end joint plate 121 and the second top end joint plate 122 are joined in a normal contact state, the upper edge 121c of the first top end joint plate 121 and the upper edge of the second top end 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 first side edge 121e of 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 second side edge 121f and the second top of the first top end joint plate 121 The second side edges 122f of the 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.

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. 12, 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 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, as shown in FIG. 1, the arch-shaped tunnel support 10 is formed by the interconnected left split support 10L and right split support 10R. As described above, in the present embodiment, the female connecting portion 40 recessed in the first crown joint plate 121 of the left split support 10L and the second crown joint plate 122 of the right split support 10R are convex. The provided male-shaped connecting portion 50 (male-shaped locking member 51) functions as a one-touch joint to be connected by one-touch.

Further, as shown in FIG. 12, the first crown joint plate 121 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 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.

By the way, in the connection structure 30 of the present embodiment, when the left split support 10L and the right split support 10R are connected, the second male connecting portion 50B is erroneously connected to the first female connecting portion 40A. It has a structure to suppress it. Hereinafter, the erroneous connection suppressing structure for suppressing the erroneous connection of the second male type connecting portion 50B to the first female type connecting portion 40A will be described. Here, the insertion port 48 of the first female type connecting portion 40A in the first top end joint plate 121 is referred to as a "first insertion port 48A", and the insertion port 48 of the second female type connecting portion 40B is referred to as a "second insertion port". It is called "48B". Further, among the opening holes 1212 provided in the first top end joint plate 121, the opening holes 1212 provided at the positions corresponding to the first female connecting portion 40A are referred to as "first opening holes 1212A", and the second The opening hole 1212 provided at the position corresponding to the female connecting portion 40B is referred to as a "second opening hole 1212B". Further, the male locking member 51 of the first male connecting portion 50A in the second top joint plate 122 is referred to as a "first male locking member 51A", and the male locking of the second male connecting portion 50B. The member 51 is referred to as a "second male locking member 51B". The first opening hole 1212A and the second opening hole 1212B, the first insertion port 48A, and the second insertion port 48B in the first top end joint plate 121 are shown in FIG. 8A. Further, the first male type locking member 51A and the second male type locking member 51B in the second top end joint plate 122 are shown in FIG. 9A.

In the present embodiment, the diameter (inner diameter) Di1 of the first insertion port 48A in the first female type connecting portion 40A is relative to the diameter (inner diameter) Di2 of the second insertion port 48B in the second female type connecting portion 40B. It is set to a small size. Further, the diameter (inner diameter) Di3 of the first opening hole 1212A in the first top end joint plate 121 is set to the same size as the diameter (inner diameter) Di1 of the first insertion port 48A, but the first insertion port 48A The diameter (inner diameter) may be larger than Di1. Further, the diameter (inner diameter) Di4 of the second opening hole 1212B in the second top joint plate 122 is set to the same size as the diameter (inner diameter) Di2 of the second insertion port 48B, but the second insertion port 48B. The diameter (inner diameter) may be larger than Di2.

Further, the diameter (outer diameter) Do1 of the first male type locking member 51A in the first male type connecting portion 50A is the diameter (outer diameter) Do2 of the second male type locking member 51B in the second male type connecting portion 50B. The dimensions are set to be relatively small compared to. Further, the diameter (outer diameter) Do1 of the first male type locking member 51A is set to a size slightly smaller than the diameter (inner diameter) Di1 of the first insertion port 48A in the first female type connecting portion 40A. Further, in the diameter (outer diameter) Do1 of the first male locking member 51A, each female locking member 46 in the first female connecting portion 40A is arranged at the most advanced position of the tapered hole 43 (tapered surface 43a). In this state, the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. Therefore, at the time of joining the first top end joint plate 121 and the second top end joint plate 122, the first male type locking member 51A in the first male type connecting portion 50A is replaced with the first male type locking member 51A in the first top end joint plate 121. It is inserted into the storage chamber 42 of the first female connecting portion 40A through the opening hole 1212A and the first insertion port 48A, and the female screw 46b of each female locking member 46 and the male screw 51c of the first male locking member 51A are inserted. By engaging with each other, the first male type connecting portion 50A and the first female type connecting portion 40A can be connected.

Further, in the present embodiment, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B is the diameter (inner diameter) of the first insertion port 48A in the first female connecting portion 40A. It is set to a larger size than Di1. As a result, the second male locking member 51B in the second male connecting portion 50B is not inserted into the storage chamber 42 of the first female connecting portion 40A through the first insertion port 48A. Further, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B is slightly smaller than the diameter (inner diameter) Di2 of the second insertion port 48B in the second female connecting portion 40B. It is set to the dimension. Further, in the diameter (outer diameter) Do2 of the second male locking member 51B, each female locking member 46 in the second female connecting portion 40B is arranged at the most advanced position of the tapered hole 43 (tapered surface 43a). In this state, the diameter is set to be slightly larger than the diameter of the female screw hole formed by each female locking member 46. Therefore, at the time of joining the first top end joint plate 121 and the second top end joint plate 122, the second male type locking member 51B in the second male type connecting portion 50B is replaced with the second male type locking member 51B in the second top end joint plate 122. It is inserted into the storage chamber 42 of the second female connecting portion 40B through the opening hole 1222A and the second insertion port 48B, and the female screw 46b of each female locking member 46 and the male screw 51c of the second male locking member 51B are inserted. The second male type connecting portion 50B and the second female type connecting portion 40B can be connected by engaging with each other.

Next, a procedure for connecting 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 erector 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 erector 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 use the left split support 10L and the right split support 10R as the tunnel axis. Move them so that they are orthogonal to each other. The booms 17L and 17R and the hands 18L and 18R in the erector device 100 can be driven by operating the operation panel 104.

13A to 13C 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. 13A to 13C, 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. 13A 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. 13A, as shown in FIG. 13B, 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 crown joint plate 121 and the second crown joint plate 122 are relatively close to each other so as to overlap in a plane. 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 first top end joint plate 121 and the second top end joint plate 122 are in a state of being overlapped in a plane. 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 is configured to match the lateral position of the second male connecting portion 50B with respect to the second female connecting portion 40B. 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. , The second crown joint plate 122 is planarly overlapped with the first crown joint plate 121, and at the same time, 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 The male connecting portion 50B is in a state of overlapping in a plane.

Therefore, from the positioning completed state shown in FIG. 13B, 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. 13C, the first male mold in the second crown joint plate 122 is formed in the first opening hole 1212A corresponding to the first female connection portion 40A of the first crown joint plate 121. The first male locking member 51A of the connecting portion 50A is the second in the second crown joint plate 122 with respect to the second opening hole 1212B corresponding to the second female connecting portion 40B of the first crown joint plate 121. The second male locking member 51B of the male connecting portion 50B is inserted respectively. As a result, 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 can be connected, respectively. As a result, the first crown joint plate 121 and the second crown joint plate 122 are joined in a state of surface contact (normal contact state), and are connected to each other by the left split support 10L and the right split support 10R. An arched tunnel support 10 is formed.

FIG. 14 shows the second top joint plate 122 in the second top joint plate 122 with respect to the first female type connection portion 40A in the first top end joint plate 121 when the left side split support 10L and the right side split support 10R according to the first embodiment are connected. It is a figure explaining the situation which suppresses the erroneous connection of 2 male type connecting part 50B. 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, in the connecting structure 30 of the present embodiment, as described above, the diameter (outer diameter) Do2 of the second male locking member 51B in the second male connecting portion 50B is the first female connecting portion. The diameter (inner diameter) of the first insertion port 48A at 40A is set to be larger than Di1. Therefore, from the state shown in FIG. 14, even if the second crown joint plate 122 tries to approach the first crown joint plate 121, the second male locking member 51B in the second male connecting portion 50B is used. It is not inserted into the storage chamber 42 of the first female type connecting portion 40A through the first insertion port 48A. Therefore, the second male locking member 51B in the second male connecting portion 50B of the second crown joint plate 122 is erroneously inserted and engaged with the first female connecting portion 40A of the first crown joint plate 121. Misconnection that is stopped can be suppressed.

From the above, according to the connecting structure 30 in the present embodiment, the side edge guide plate 1213 and the upper edge guide plate are easily suppressed while the misassembly of the second male connecting portion 50B with respect to the first female connecting portion 40A is easily suppressed. Regular connection by guiding the first male connection 50A and the second male connection 50B to the first female connection 40A and the second female connection 40B, which are the normal connection targets, respectively, by 1214. It is possible to easily realize the connection between the parts. 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 the 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 a position of each 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 scaffolding 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, in the present embodiment, 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 (first) of the female type connecting part 40 is connected. Even if the center positions of the insertion port 48A, the second insertion port 48B) and the male locking member 51 are relatively slightly deviated from each other, the opening hole 1212 (first opening hole 1212A, first opening hole 1212A, first opening hole 1212A, first opening hole 1212A, first opening hole 1212A, first opening hole 1212A, first opening hole 1212A, By sliding the tapered surface 51e of the male locking member 51 along the edge of the 2 opening hole 1212B), the insertion port 48 (first insertion port 48A, second insertion port 48B) in the female connecting portion 40 The male locking member 51 can be guided in a direction in which the amount of misalignment between the centers of the male locking member 51 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 insertion port 48 (first insertion port 48A, second insertion port 48B) of the female type connecting portion 40 and the male type locking member 51 are slightly misaligned, the male type locking member 51 can be connected to the female type connecting portion. It can be smoothly guided to the insertion port 48 (first insertion port 48A, second insertion port 48B) of 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 holes 1212 (first opening holes 1212A, second opening holes 1212B) formed in the first top end joint plate 121 according to this modification are from the inner surface 121b to the outer surface in the thickness direction of the first top end joint plate 121. It has a tapered surface 1215 that expands in diameter toward 121a. By forming such a tapered surface 1215, when connecting the left split support 10L and the right split support 10R (female connecting portion 40 and male connecting portion 50), the insertion port of the female connecting portion 40 is inserted. Even if the center positions of 48 (first insertion port 48A, second insertion port 48B) and the male locking member 51 are relatively slightly displaced, the opening hole 1212 (first opening) of the first top end joint plate 121 By sliding the male locking member 51 on the tapered surface 1215 in the holes 1212A and the second opening hole 1212B), the male locking member 51 and the insertion port 48 (first insertion port 48A, second insertion port 48B) in the female connecting portion 40 , The male locking member 51 can be guided in a direction in which the amount of misalignment between the centers of the male locking member 51 is small. According to this, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connecting portion 40.

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

Claims (3)

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,
The first female type connecting portion and the second female type connecting portion recessed in the first top end joint plate,
The first male type connecting portion and the second male type connecting portion projected on the second top end joint plate, and the second male type connecting portion,
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 first female type connecting portion has a first insertion port into which the first male type connecting portion can be inserted.
The second female type connecting portion has a second insertion port into which the second male type connecting portion can be inserted.
The diameter of the first insertion slot is smaller than the diameter of the second insertion slot.
The diameter of the first male type connecting portion is smaller than the diameter of the second male type connecting portion and the diameter of the first insertion port.
The diameter of the second male coupling portion, rather smaller than the diameter of large and said second insertion port than the diameter of the first insertion opening,
The first female mold connecting portion and the second female mold connecting portion are recessed in parallel in the lateral width direction of the first top end joint plate.
The first male type connecting portion and the second male type connecting portion are convexly provided in parallel in the lateral width direction of the second top end joint plate.
A side edge guide plate is projected 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.
Connection structure of split support. An upper edge guide plate is projected from the upper edge of the first top end joint plate in a direction perpendicular to the outer surface of the first top end joint plate.
When the pair of split support works are connected, the upper edge of the second top end joint plate comes into contact with the upper edge guide plate, so that the first male type connecting portion with respect to the first female type connecting portion The height position is aligned with the height position of the second male type connection part with respect to the second female type connection part.
The connection structure of the split support according to claim 1. 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.
The first female connecting portion includes a casing having a storage chamber in which the first insertion opening is formed, and locks the male locking member inserted into the storage chamber from the first insertion opening. death,
The second female connecting portion includes a casing having a storage chamber in which the second insertion opening is formed, and locks the male locking member inserted into the storage chamber from the second insertion opening. do,
The connecting structure of the split support according to claim 1 or 2.

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