JP3869934B2 - Segment transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment conveying device applied to a shield machine.
[0002]
[Prior art]
Generally, in the shield construction method, a tunnel is constructed by assembling segments on the inner surface of a hole excavated by a shield machine. At this time, it is necessary to sequentially supply the segments to the segment assembly robot from behind, and this is performed using a conveyor or the like.
[0003]
On the other hand, when the tunnel diameter is relatively small, there is not enough space to supply the segment at the lower part of the robot, and the lower part cannot be supplied. Therefore, the inventors have proposed an apparatus configuration for supplying the upper part in Japanese Patent Application No. 6-228095.
[0004]
In this, a segment transport device equipped with a roller conveyor is provided at the rear upper part of the robot, and a segment reverse loading device is provided at the rear of the transport device to hold the segment supplied to the lower part by the reverse load device. Then, it is turned upside down and then turned 180 ° upward, pushed out from behind and loaded onto the conveying device. After that, the segment is sent forward by the transport device. The transport device includes a feeder that is positioned at the forefront and delivers a segment to the robot, and a roller conveyor that transports the segment toward the feeder.
[0005]
[Problems to be solved by the invention]
By the way, in the segment conveying apparatus of the prior application, a plurality of segments are placed on a roller conveyor, and these segments are simultaneously pushed forward by one sheet (one pitch) by an extruding apparatus. The extrusion device is composed of an annular chain extending over the entire length of the conveyor and a tiltable hook (tilting dog) arranged on the upper side of the chain. The chain is only allowed to reciprocate for one pitch. When moving forward, the segment is hooked and pushed by a tiltable hook, and when moving backward, the tiltable hook is turned over to pass under the segment and return to its original position. Yes.
[0006]
However, the prior application is inconvenient because it can only move all the segments on the conveyor at the same time. For example, segment assembly may be continued during night construction, but loading on the conveyor may be stopped. At this time, as the assembly of the segments and the forward feeding are repeated, a space is formed behind the conveyor. Even if loading on the conveyor is resumed, the empty space cannot be filled immediately, and loading and forward feeding must be repeated as soon as the last segment is lost. However, since a certain amount of time is required for the segment to reach the forefront, if the robot needs the segment before that, it cannot be supplied, resulting in a time loss.
[0007]
In the prior application, the conveyor is divided into front and rear so that it can be adapted to bend the tunnel, and can be bent in the horizontal direction. However, since the chain is common to these conveyors, the bending angle cannot be increased.
[0008]
Furthermore, the chain occupies a certain vertical width, which is disadvantageous in terms of space.
[0009]
[Means for Solving the Problems]
The present invention relates to a segment conveying device for conveying the segment forward from the rear of the tunnel, a plurality of roller conveyors which segment is placed in the front-rear direction, each respective roller conveyors, the mounting An extruding device for extruding the generated segment forward, the extruding device being provided in the pusher rod, a pusher rod extending in the longitudinal direction of the conveyor, a jack for reciprocating the pusher rod back and forth, and It consists of a retractable hook that pushes the segment from the rear without falling backward, but the extrusion device provided on one of the roller conveyors adjacent to the front and rear is located at the center in the width direction of the conveyor At the same time, an extrusion device provided on the other roller conveyor is disposed on both outer sides in the conveyor width direction, and In which the extrusion device provided in an extrusion device and the other roller conveyor provided on one of the roller conveyors et is overlapping the conveyor longitudinally.
[0010]
According to this, since the extruding device is provided for each roller conveyor, when the rear roller conveyor becomes empty, only the conveyor can be loaded and fed forward. This makes it possible to front-end segments and prevent time loss.
[0011]
Here, it is preferable that a plurality of the retractable hooks are provided at predetermined intervals in the longitudinal direction of the pusher rod .
[0013]
Moreover, it is preferable that this segment conveying apparatus is provided in the upper part in a tunnel.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0015]
FIG. 7 shows the entire shield machine to which such a segment conveying apparatus is applied. As shown in the figure, the excavator main body 1 moves forward toward the left in the figure, and the segment 2 is assembled to the inner surface of the hole excavated by the excavator main body 1 so that the tunnel 3 is constructed. It has become. Here, the shield frame 4 is a folding type, and an assembly robot 6 for assembling the segments 2 is disposed in the rear frame 5. However, since the pipe part 8 which partitions the room and the soil discharge pipe 7 is formed in the center part in the rear frame 5, the assembly robot 6 goes around the pipe part 8 and assembles the segments 2 sequentially. Become. 9 is a cutter, 10 is a propulsion jack, and 11 is a bent jack. The tunnel 3 has a small diameter of about 5 m. The jacks used here, including the propulsion jack 10 and the bent jack 11, are all hydraulic jacks.
[0016]
A segment transport device 12 for transporting the segment 2 from the rear to the front and supplying it to the assembly robot 6 is provided behind the assembly robot 6 and in the upper part of the tunnel 3. The segment conveying device 12 includes a front feeder 13 and a rear conveyor 14. When there is a request for the segment 2 from the assembly robot 6, the feeder 13 feeds forward one segment, and delivers the foremost segment 2 to the assembly robot 6. As a result, the conveyor 14 sequentially replenishes the segments 2 in the space behind the empty feeder 13. Similarly, the conveyor 14 feeds forward one segment (one pitch). This will be described later.
[0017]
A segment inversion loading device 15 is provided behind the conveyor 14. This segment reversal loading device 15 holds and raises another transport device provided in the lower part of the tunnel 3, that is, the segment 2 supplied by the transport carriage 16, and then reverses 180 ° upward, Are pushed out and loaded onto the conveyor 14. The transport carriage 16 is self-propelled and is configured by connecting a plurality of carriages 17. Then, a predetermined number of segments 2 are loaded on each carriage 17 and traveled from a rear loading position outside the figure to a loading position where the segment reverse loading device 15 is located. In the illustrated example, the number of sheets loaded on the carriage 17 is one, but usually a plurality of sheets are stacked. The segment inversion loading device 15 is provided with an extrusion jack 22 for extruding the inverted segment 2 from the rear.
[0018]
As shown in FIG. 8, a sleeper 18 is provided at the bottom of the tunnel 3, and two pairs of rails 19 and 20 are provided on the sleeper 18. The sleepers 18 are provided so as to stretch the inner walls of the tunnel 3 on both sides in the width direction, and are arranged at equal intervals along the tunnel longitudinal direction. The rails 19 and 20 are mounted and fixed on these sleepers 18 and extend along the longitudinal direction of the tunnel. The pair of inner rails 20 are for driving the transport carriage 16, and the pair of outer rails 19 are a support frame 21 of the segment reverse loading device 15 and a support frame (not shown) of the transport device 12. For running. These support frames are connected to the above-mentioned rear frame 5 via a tow rod (not shown) so as to advance following the advance of the excavator main body 1. Along with this advancement, sleepers 18 and rails 19 and 20 are sequentially added.
[0019]
As shown in FIG. 8, the support frame 21 of the segment inversion loading device 15 is formed in a gate shape when viewed from the front. The same applies to the support frame of the transport device 12. A rotating frame 23 extending in the width direction is provided on the top of the support frame 21. The segment 2 is inverted from the lower side to the upper side by the rotation of the rotating frame 23. The rotating frame 23 is supported at both ends by a bearing boss member 25 provided on both sides of the top of the support frame 21 so as to be rotatable. The rotating frame 23 is rotationally driven by a reversing jack 38 via a rack and pinion mechanism 45 from both sides thereof. By driving from both sides in this way, the burden on the drive unit can be reduced and each component can be made smaller.
[0020]
An engaging member 28 for engaging with the segment 2 is disposed at the center position in the width direction of the rotating frame 23. The engaging member 28 is suspended and supported by a pair of ropes (not shown) and can be raised and lowered. That is, when the rope is raised with the engagement member 28 engaged with the segment 2, the segment 2 rises. The engaging member 28 has an upper portion and a lower portion that can rotate relative to each other about the vertical axis. Thus segment 2 is turned horizontally during its ascent. The engaging member 28 is also provided with a gripping mechanism (not shown) for gripping the segment 2 from the front and rear.
[0021]
As shown in FIGS. 7 and 8, the segment 2 has a rectangular shape that is curved in accordance with the tunnel cross-sectional shape, the long side direction is curved along the tunnel circumferential direction, and the short side direction is along the tunnel longitudinal direction. It is straight.
[0022]
As shown in FIG. 7, the segment 2 is placed on the transport carriage 16 in a so-called downwardly convex state with the longitudinal direction thereof set in the tunnel longitudinal direction. When the segment 2 is supplied below the rotating frame 23 in this state, the engaging member 28 is lowered to engage or hold the segment 2. Thereafter, the engaging member 28 and the segment 2 are raised, and the segment 2 is rotated 90 ° in the horizontal direction by the operator's hand during the raising process. As a result, the segment 2 has a long posture in the width direction. When the ascent is finished, the segment 2 comes into close contact with the rotating frame 23.
[0023]
Next, two reversing jacks 38 are simultaneously stroked, whereby the rotating frame 23 is rotated, and the segment 2 is reversed and raised from the rear. Thereafter, the engagement holding of the rotating frame 23 and the segment 2 is released, the extrusion jack 22 is extended, the segment 2 is pushed forward, and the segment 2 is loaded on the conveyor 14.
[0024]
Here, after the segment 2 is reversed, the segment 2 assumes a so-called upwardly projecting posture along the tunnel upper wall. Since the segment 2 is transported by the transport device 12 while maintaining this posture, the upper space can be used without waste and the segment 2 can be supplied in a small space.
[0025]
FIG. 1 shows the entire conveyor 14 of the segment conveying device 12. The conveyor 14 is divided into two in the front-rear direction (the left side is the front) and a roller conveyor 51 for placing the segments 2 three by three. The conveyor 14 is provided for each of the roller conveyors 51 and pushes the placed segments 2 forward. And an extrusion device 52 for the above. The extrusion device 52 is disposed at the center in the conveyor width direction in the front roller conveyor 51 (51a) and on both outer sides in the conveyor width direction in the rear roller conveyor 51 (51b). A dividing line of the roller conveyor is indicated by A.
[0026]
The roller conveyor 51 includes a conveyor frame 53 fixed on the aforementioned support frame (not shown), and a plurality of side idle rollers 54 arranged in the longitudinal direction of the conveyor on both sides of the conveyor frame 53. . In addition, a pair of central idle rollers 55 that are spaced apart on both sides are also arranged in the longitudinal direction at the center in the width direction of the conveyor frame 53. These idle rollers 54 and 55 are provided at the same position in the width direction in each roller conveyor 51.
[0027]
FIG. 2 is a cross-sectional view showing the configuration of the rear roller conveyor 51 (51b). As shown in the figure, the conveyor frame 53 includes a pair of side frames 56 extending in the longitudinal direction of the conveyor (in the thickness direction of the paper) on both sides in the width direction, and a plurality of cross frames 57 that span the side frames 56 at equal intervals. The whole is formed into a ladder shape. The side idle rollers 54 are rotatably attached to side support brackets 58 provided on both side frames 56 via pins 59. On the other hand, a subframe 60 is attached on the cross frame 57, and a pair of left and right post members 61 are erected from the subframe 60. A central support bracket 62 is fixed to the upper surface of the post member 61 (the right side is schematically shown), and a central idle roller 55 is rotatably attached to the post member 61 via a pin 63. The side idle roller 54 and the central idle roller 55 form a mounting surface for the segment 2 and are formed in a substantially conical shape with a symmetrical cross section that follows the shape of the bottom surface of the segment 2. The side support bracket 58, the subframe 60, the post member 61, and the center support bracket 62 extend over the entire length of the conveyor.
[0028]
The extrusion device 52 is configured as follows. A pair of clamping members 64 are fixed on both outer sides of the subframe 60, and pusher rods 65 are provided between the clamping members 64, respectively. The pusher rod 65 extends in the longitudinal direction of the conveyor, and is guided by the clamping member 64 and can be moved back and forth. As shown in FIGS. 4 and 5, the pusher rod 65 includes a pair of left and right side plates 66 and a plurality of long and short cross plates 67 that span the side plates 66 at a predetermined interval. Here, the side plate 66 is intermittently provided with circular protrusions 68 protruding outward, and these circular protrusions 68 are engaged with the grooves 69 of the clamping member 64 as shown in FIG. 2 to support the weight of the pusher rod 65. It has become so.
[0029]
Further, as shown in FIG. 4, a connection bracket 69 having a T-shaped cross section that spans the lower surface of the cross plate 67 is provided at the front portion (the left side is the front) of the pusher rod 65. A piston rod 71 of 70 (jack of the present invention) is connected via a pin 72. The push-out jack 70 is disposed along the longitudinal direction with the piston rod 71 facing forward, and is fixed onto the subframe 60 via a fixing bracket 73 and a pin 74. As a result, the pusher rod 65 is reciprocated back and forth as the push-out jack 70 expands and contracts. The push-out jack 70 is arranged so as to be hidden directly under the pusher rod 65, and is provided for each pusher rod 65.
[0030]
As shown in FIGS. 2 and 4, a rack 76 is attached to the opposite side of the pusher rods 65 via an intermediate member 75. Each rack 76 is engaged with a pinion gear 77, and the pinion gear 77 is attached to a common shaft 78. The shaft 78 is rotatably supported by a bearing bracket 79 provided on the subframe 60. Both push-out jacks 70 are expanded and contracted at the same time. However, when configured as described above, both pusher rods 65 are moved back and forth at the same speed completely, and the speed synchronization of the push-out jacks 70 becomes unnecessary.
[0031]
As shown in FIGS. 4 and 5, three retractable hooks 80 are arranged at equal intervals on the pusher rod 65. That is, the retractable hook 80 is formed of a plate material and is rotatably supported between the side plates 66 via the pins 81. The spring 82 as a spring member is urged rearward, but its rotation is restricted by a stopper member 83 having a cross plate 67. As a result, it normally projects upward from the pusher rod 65 as shown. In this protruding state, a contact plate 84 is provided on the front surface of the retractable hook 80, and a roller 85 is provided on the corner at the rear top. Thus, the retractable hook 80 is configured to fall forward but not backward. The above is the configuration of the extrusion device 52.
[0032]
As shown in FIG. 2, the segment 2 is provided with a gripping fitting 34 that protrudes from the center of the inner peripheral surface thereof. The gripping bracket 34 is used when the assembly robot 6 grips the segment 2 when assembling the segment, and engages with the engagement member 28 when the segment 2 is lifted or reversed by the segment reversal loading device 15. Used to make it. In addition, since it is necessary to remove the holding | grip metal fitting 34 after completion | finish of segment assembly, it is screwed together and attached to the segment 2.
[0033]
The gripping bracket 34 is used for preventing the segment 2 from falling off, positioning, or guiding during segment transportation. That is, both post members 61 are provided with mounting brackets 86 extending from the center toward the center at equal intervals in the longitudinal direction, and a pair of guide rails 87 are connected over the entire length of the roller conveyor 51 by connecting these mounting brackets 86. Provided. By engaging the gripping metal fitting 34 in the groove between the guide rails 87, the segment 2 can be accurately guided and moved forward, and can be prevented from falling off.
[0034]
The front roller conveyor 51 (51a) is configured as shown in FIG. This is substantially the same as the roller conveyor 51b at the rear, and the same components are denoted by the same reference numerals in the figure. However, here, only one extrusion device 52 is provided at the center in the conveyor width direction, and this point is different from the rear roller conveyor 51b.
[0035]
As shown in FIG. 1, the front extrusion device 52a has a rear end portion that extends to the rear roller conveyor 51b and overlaps the rear extrusion device 52b by a predetermined length L. The last retractable hook 80 is positioned on the roller conveyor 51b in the normal retracted position.
[0036]
As shown in FIG. 1, the segments 2 are placed at equal pitches on the front and rear roller conveyors 51 shown in the figure. Then, the forward feed for one pitch is executed by the extrusion device 52. That is, when the push-out jack 70 is extended forward, the contact plate 84 of the tiltable hook 80 contacts the rear surface of the segment 2 and pushes the segment 2 from the rear. As a result, the idle rollers 54 and 55 of the roller conveyor 51 rotate, and the segment 2 is moved forward. The roller conveyor 51 has a slight downward slope, which prevents the segment 2 from overshooting. After the advance, the segment 2 is prevented from retreating by the retraction preventing hook 89, and the segment 2 is held at the position shown in the figure.
[0037]
Similar to the retractable hook 80, the retreat prevention hook 89 falls forward but does not fall backward. 2 and 3, it is attached to the mounting bracket 86 and held at a fixed position of the roller conveyor 51. Therefore, when the segment 2 moves forward, it falls forward, dives under the segment 2 to allow the segment 2 to move forward, and when the segment 2 moves forward, returns to the upright position to prevent the segment 2 from moving backward.
[0038]
After the segment has advanced, the extrusion jack 70 is now contracted. Then, the retractable hook 80 moves backward and comes into contact with the segment 2. In this case, the retractable hook 80 is pushed by the segment 2 and falls forward, and as shown in FIG. After this, the spring 82 is returned to the upright position and returns to the original retracted position. Since the roller 85 rolls when diving the segment 2 or the holding metal fitting 34, the movement is smooth.
[0039]
In the conveyor 14, an independent extrusion device 52 is provided for each roller conveyor 51. As a result, the segment 2 can be fed forward for each roller conveyor 51.
[0040]
That is, normally, the front and rear extrusion devices 52a and 52b are simultaneously operated to advance all the segments 2 simultaneously. However, as described above, when the assembly is preceded and the rear part of the conveyor 14 is empty, the segment 2 can be replenished only when the rear roller conveyor 51b becomes empty. That is, even if the front roller conveyor 51a has the segment 2, the rear roller conveyor 51b can be replenished with the segment 2 regardless of this. When the front segment 2 of the front roller conveyor 51a is used for assembly, and the roller conveyor 51a becomes empty, the segment 2 stocked on the rear roller conveyor 51b is transferred to the front roller conveyor 51a. That's fine. In this way, segment 2 can be left-justified, and time loss is prevented.
[0041]
Further, when the front and rear roller conveyors 51 are bent in accordance with the tunnel bending work, the bending angle can be increased because the extrusion device 52 is independent. Further, since the front and rear extrusion devices 52 overlap even when bent, the transfer of the segment 2 between the roller conveyors 51 can be performed reliably. Of course, the same can be said for bending in the vertical direction.
[0042]
In addition, since the pusher rod 65 is used instead of the conventional chain, the pusher rod 65 can be reduced in the vertical direction and the occupied space can be reduced. The push jack 70 is disposed along the pusher rod 65 to achieve compactness. The chain is noisy, has a shortcoming of refueling and cleaning, and has the disadvantage that the service life is shortened when muddy water is applied, but the pusher rod 65 does not have such a drawback.
[0043]
Here, even if it is made to overlap with the extrusion apparatus by the conventional chain, one sprocket etc. interfere with the other sprocket etc., and overlap is very difficult. Here, since the pusher rod 65 is used, there is no mutual interference and the overlap is very easy.
[0044]
In this embodiment, the conveyor 14 is divided into two parts, but naturally, it can be divided into three parts, four parts, or the like. In such a case, if the extrusion devices 52 are alternately provided, such as one, two, one, two, etc., it is possible to overlap all the divided portions. This embodiment is an example of one or two from the front. The number of segments placed on each roller conveyor 51 is not limited to three. Here, the present invention is applied to the upper feed type conveyor, but it can also be applied to the lower feed type conveyor.
[0045]
In addition, the present invention can employ various embodiments.
[0046]
【The invention's effect】
The present invention exhibits the following excellent effects.
[0047]
(1) The segment can be prepended and time loss can be prevented.
[0048]
(2) A large bending angle can be obtained during tunnel bending construction.
[Brief description of the drawings]
FIG. 1 is a plan view showing a conveyor of a segment conveying apparatus.
FIG. 2 is a longitudinal front view of a rear roller conveyor as viewed from the rear.
FIG. 3 is a longitudinal front view of a front roller conveyor as viewed from the rear.
FIG. 4 is a longitudinal side view of the extrusion device.
FIG. 5 is a longitudinal sectional front view showing a pusher rod and a retractable hook.
FIG. 6 is a side view showing a state in which the retractable hook falls.
FIG. 7 is a side view showing the entire shield machine.
FIG. 8 is a front view showing a segment inversion loading device.
[Explanation of symbols]
2 Segment 3 Tunnel 12 Segment conveying device 51, 51a, 51b Roller conveyor 52, 52a, 52b Extruding device 65 Pusher rod 70 Extruding jack 80 Retractable hook

Claims (3)

A segment conveying device for conveying the segment forward from the rear of the tunnel, a plurality of roller conveyors which segment is placed in the front-rear direction, each respective roller conveyors, the mounting segment Provide an extrusion device to push forward ,
The pusher rod is provided in the pusher rod extending in the longitudinal direction of the conveyor, the jack for reciprocating the pusher rod back and forth, and the pusher rod. The pusher rod falls forward, but does not fall backward. It consists of a retractable hook that presses from
Among the roller conveyors adjacent to the front and rear, an extrusion device provided on one roller conveyor is disposed in the center in the conveyor width direction, and an extrusion device provided on the other roller conveyor is disposed on both outer sides in the conveyor width direction. A segment conveying device characterized in that the extrusion device provided in one of the roller conveyors and the extrusion device provided in the other roller conveyor are overlapped with each other in the longitudinal direction of the conveyor . The segment conveying apparatus according to claim 1, wherein a plurality of the retractable hooks are provided at predetermined intervals in the longitudinal direction of the pusher rod . The segment conveying apparatus of Claim 1 or 2 provided in the upper part in a tunnel .

Images