Carriage for support installation and repair / reinforcement method for existing tunnel

Abstract

To provide a technique relating to a carriage for support installation that enables mechanized construction for installing steel supports at predetermined support installation scheduled positions in a repair / reinforcement method for existing tunnels.SOLUTION: A carriage for support installation which is applied to a method for repairing and reinforcing an existing tunnel, and is used for installing steel supports along an inner wall surface of the existing tunnel, comprises: a self-propelled frame which can travel inside the existing tunnel along its extending direction; and a support installation device including a movable erector arm mounted on the self-propelled frame and a support gripping unit which is provided on the erector arm, and can freely switch between a state of gripping a steel support and a released state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support installation vehicle and a repair and reinforcement method for existing tunnels using the vehicle. [Background technology]

[0002] The inward lining method is known as a construction method for repairing and reinforcing existing tunnels. One example of this method is to fix repair and reinforcement panels to the inner wall surface of an existing tunnel and fill the gaps behind the panels with a filler material such as grout mortar. When steel supports are used in the inward lining method, the steel supports are installed along the inner wall surface of the existing tunnel, and then the repair and reinforcement panels are fixed to the steel supports or angle members erected between the steel supports. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3211895 Summary of the Invention [Problem to be solved by the invention]

[0004] In repair and reinforcement methods for existing tunnels, steel supports are sometimes installed along the inner wall surface of the existing tunnel using a work cart. However, while conventional work carts for repairing and reinforcement of existing tunnels have a work platform, the installation of steel supports has to be done manually. Because steel supports are heavy, the work of installing them on the inner wall surface of the tunnel requires a lot of labor, resulting in low work efficiency.

[0005] The technology disclosed herein has been developed in consideration of the above-mentioned problems, and its purpose is to provide technology related to a support installation cart that enables mechanized construction to install steel supports at designated support installation locations in repair and reinforcement methods for existing tunnels. [Means for solving the problem]

[0006] One aspect of the present disclosure is applied to a construction method for repairing and reinforcing an existing tunnel, and is a support installation cart for installing steel supports along the inner wall surface of the existing tunnel, a self-propelled platform capable of traveling inside the existing tunnel along its extension direction; A support installation device having a movable erector arm mounted on the self-propelled platform and a support gripping unit provided on the erector arm and capable of freely gripping and releasing the steel support; It is a support installation cart equipped with the above.

[0007] The tunnel may further include a bottom steel support holding device that holds a bottom steel support to be installed at the bottom of the existing tunnel.

[0008] The support installation device may be provided on the front side of the self-propelled platform, and the bottom steel support holding device may be provided on the rear side of the self-propelled platform.

[0009] The bottom steel support holding device has a rail extending along the front-rear direction of the self-propelled platform, and a hoisting machine provided so as to be movable along the rail, The rail may be provided so as to protrude rearward beyond the self-propelled platform.

[0010] The self-propelled platform is a gantry-type platform having a portal frame, and the portal frame A support transport cart for transporting the steel support may be stored in the space below.

[0011] Furthermore, a repair and reinforcement method for an existing tunnel can be provided in which the above-mentioned support installation cart is used to install the steel support on the inner wall surface of the existing tunnel.

[0012] The existing tunnel may be a headrace tunnel. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide technology relating to a support installation cart that enables mechanized construction to install steel supports at designated support installation locations in a repair and reinforcement method for existing tunnels. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a support installation carriage according to an embodiment. [Figure 2] FIG. 2 is a front view of the support installation carriage according to the embodiment. [Figure 3] FIG. 3 is a diagram illustrating an installation mode of the shoring installation device according to the embodiment. [Figure 4] FIG. 4 is a diagram illustrating a support installation device according to an embodiment. [Figure 5] FIG. 5 is a diagram illustrating a support installation device according to an embodiment. [Figure 6] FIG. 6 is a top view of the controller according to the embodiment. [Figure 7] FIG. 7 is a diagram illustrating a tunnel repair and reinforcement method using a support installation vehicle according to the embodiment. [Figure 8] FIG. 8 is a diagram illustrating a tunnel repair and reinforcement method using a support installation vehicle according to the embodiment. [Figure 9] FIG. 9 is a diagram illustrating a support installation cart according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the present embodiment, a support installation cart that is applied to a method for repairing and reinforcing an existing tunnel and that installs steel supports along the inner wall surface of the existing tunnel, and a repair and reinforcement method for an existing tunnel using the same will be described. Note that, although an example of an existing tunnel to which the repair and reinforcement method for an existing tunnel according to the present embodiment can be applied is a headrace tunnel, the present disclosure is not particularly limited to any existing tunnel.

[0016] <Embodiment> Fig. 1 is a perspective view of a shoring installation cart 1 according to an embodiment. Fig. 2 is a front view of the shoring installation cart 1 according to an embodiment. The shoring installation cart 1 has a self-propelled platform 2 that can travel inside an existing tunnel in the direction of its extension, and a shoring installation device 4 that is mounted on the self-propelled platform 2. Fig. 1 shows the front-rear, left-right, top-bottom directions of the shoring installation cart 1.

[0017] The self-propelled platform 2 is configured as a gantry-type platform having a portal frame 21, and in the illustrated example, three portal frames 21 are interconnected via frames extending in the front-to-rear direction. As shown in Fig. 2, the self-propelled platform 2 configured as a gantry-type platform can freely store a support transport cart 60 for transporting steel supports in the space S1 below the portal frame 21. Of course, the structure of the self-propelled platform 2 is not particularly limited.

[0018] The support installation cart 1 has running wheels 22 on each of its front, rear, left and right sides for self-propelling within the existing tunnel. The self-propelled platform 2 also includes an upper horizontal frame 23 located at the upper level in the height direction, horizontal frames 24A, 24B for fixing the support installation device, horizontal frames 25A, 25B for supporting the upper side work stage, and horizontal frames 26A, 26B for supporting the lower side work stage. Each of these horizontal frames is The upper horizontal frame 23 is a frame for supporting an upper main work stage 27, which will be described later. The shoring installation device fixing horizontal frames 24A, 24B are frames for fixing the shoring installation device 4, and are provided below the upper horizontal frame 23 with a gap between them. The upper side work stage supporting horizontal frames 25A, 25B are frames for supporting the upper side work stages 28A, 28B, and are provided so as to protrude laterally from the portal frame 21. The lower side work stage supporting horizontal frames 26A, 26B are frames for supporting the lower side work stages 29A, 29B, and are provided so as to protrude laterally from the portal frame 21.

[0019] The self-propelled platform 2 is provided with a work stage on which workers can perform work. In this embodiment, an upper main work stage 27 and upper side work stages 28A and 28B are provided at the upper position of the self-propelled platform 2, and lower side work stages 29A and 29B are provided at the lower position of the self-propelled platform 2. The upper main work stage 27 is provided on the upper horizontal frame 23. The upper side work stages 28A and 28B are provided on upper side work stage support horizontal frames 25A and 25B, and are disposed on both the left and right sides of the upper main work stage 27. The lower side work stages 29A and 29B are provided on lower side work stage support horizontal frames 26A and 26B. However, the position, size, number, and other aspects of the work stages provided on the self-propelled platform 2 are not particularly limited. Furthermore, the upper side work stages 28A, 28B and the lower side work stages 29A, 29B may be configured as movable stages that can slide in the front-rear direction of the support installation cart 1.

[0020] The shoring installation device 4 is fixed to horizontal frames 24A, 24B for fixing the shoring installation device on the self-propelled platform 2. Fig. 3 is a diagram illustrating the installation mode of the shoring installation device 4 according to the embodiment. For the purpose of making it easier to understand the installation mode of the shoring installation device 4, the illustration of the upper part of the self-propelled platform 2 (such as the upper main work stage 27 and upper side work stages 28A, 28B) has been omitted as appropriate for the sake of convenience. Figs. 4 and 5 are diagrams illustrating the shoring installation device 4 according to the embodiment.

[0021] The shoring installation device 4 is an erector device equipped with an erector arm 40 including a slider 41 and an attachment arm 42, a shoring gripping unit 43, a connecting unit 44, and accessories and a drive source for driving each of these mechanisms. In this embodiment, the shoring installation device 4 is installed on the front side of the shoring installation cart 1. The slider 41 of the erector arm 40 is fixed, for example, to the shoring installation device fixing horizontal frames 24A and 24B of the self-propelled platform 2. More specifically, the slider 41 is arranged horizontally between the shoring installation device fixing horizontal frames 24A and 24B. The slider 41 has a base 411 fixed to the shoring installation device fixing horizontal frames 24A and 24B, a slide 412 mounted retractably relative to the base 411, and a rod 413 mounted on the slide 412. X1 shown in FIG. 4 is the main axis of the slider 41. The base portion 411, slide portion 412, and rod portion 413 of the slider 41 are arranged coaxially with the main axis X1 as the central axis.

[0022] The slider 41 is capable of sliding the slide portion 412 along the direction of the main axis X1 relative to the base portion 411. In this embodiment, the main axis X1 of the slider 41 coincides with the front-rear direction of the support installation cart 1, and the slide portion 412 can be extended and retracted in the direction of arrow A in Fig. 4. In addition, the rod portion 413 of the slider 41 is configured to be rotatable in forward and reverse directions (indicated by arrow B in Fig. 4) with the main axis X1 as the rotation axis.

[0023] The rod portion 413 of the slider 41 is connected to an attachment arm 42 having a rod shape extending in one direction. In this embodiment, the attachment arm 42 is connected to a base rod portion 4 The mounting arm 42 includes a mounting arm 41 and a telescopic rod portion 422 mounted so as to be extendable and retractable in the axial direction relative to the base rod portion 421. In FIG. 4, symbol X2 is the central axis of the mounting arm 42 (hereinafter referred to as the "arm axis"). The base rod portion 421 and telescopic rod portion 422 of the mounting arm 42 are arranged coaxially. As shown by arrow C in FIG. 4, the mounting arm 42 is extendable and retractable along the arm axis X2. That is, the telescopic rod portion 422 slides axially relative to the base rod portion 421, thereby allowing the mounting arm 42 to extend and retract along the arm axis X2 (in the direction of arrow C).

[0024] The connecting unit 44 is a unit that connects the slider 41 and the mounting arm 42. The connecting unit 44 is interposed, for example, between the rod portion 413 of the slider 41 and the base rod portion 421 of the mounting arm 42, and is configured to include a link mechanism, a drive cylinder, and the like that enable the base rod portion 421 to rotate and swing relative to the rod portion 413.

[0025] The connecting unit 44 connects the base rod portion 421 of the mounting arm 42 to the rod portion 413 of the slider 41 so that it can rotate freely in forward and reverse directions (indicated by arrow D in FIG. 4) around a rotation axis X3. The rotation axis X3 is perpendicular to the main axis X1 of the slider 41. The rotation axis X3 is set as an axis extending in the up-and-down direction of the support installation cart 1. The connecting unit 44 also connects the base rod portion 421 of the mounting arm 42 to the rod portion 413 of the slider 41 so that it can swing freely in forward and reverse directions (indicated by arrow E in FIG. 4) around a swing axis X4. The swing axis X4 is perpendicular to the rotation axis X3 and is set as an axis extending in a substantially horizontal direction.

[0026] Next, the shoring gripping unit 43 will be described. The shoring gripping unit 43 is attached to a mounting portion 423 provided on the tip side of the telescopic rod portion 422 of the mounting arm 42. The configuration shown in Fig. 5 is one example, and the shoring gripping unit 43 includes a first frame portion 431 connected to the mounting portion 423 of the telescopic rod portion 422, a second frame portion 432 connected to the first frame portion 431, and a pair of clamps 433A and 433B provided on the second frame portion 432. The first frame portion 431 of the shoring gripping unit 43 is connected to the mounting portion 423 of the mounting arm 42 so as to be rotatable in forward and reverse directions about a rotation axis X5 (indicated by arrow F in Fig. 5). The rotation axis X5 is perpendicular to the arm axis X2 of the mounting arm 42. The second frame portion 432 of the shoring gripping unit 43 is connected to the first frame portion 431 via a link mechanism and is rotatable in forward and reverse directions around a rotation axis X6 (indicated by arrow G in FIG. 5). The rotation axis X6 is perpendicular to the arm axis X2 and the rotation axis X5.

[0027] The second frame portion 432 is a frame member that extends in one direction, and has a clamp 433A provided on one side in the extension direction and a clamp 433B provided on the other side. As shown in Figures 4 and 5, the second frame portion 432 can grip the side steel support 50 by clamping it from the sides with a pair of clamps 433A, 433B. Each clamp 433A, 433B has a pair of clamp pieces 434A, 434B that are arranged opposite each other with a gap in the thickness direction of the second frame portion 432. The gap between these clamp pieces 434A, 434B can be changed by an actuation source (not shown) (indicated by arrow H in Figure 5). Each clamp piece 434A, 434B grips the side steel support 50 by narrowing the gap between the clamp pieces 434A, 434B, and releases the grip of the side steel support 50 by widening the gap. The side steel support 50 is a steel support that is installed along the inner wall surface of the existing tunnel. In this embodiment, the side steel support 50 is curved so as to fit along the arch-shaped inner wall surface of the existing tunnel, but the shape of the side steel support 50 is not particularly limited and can be changed as appropriate depending on the shape of the inner wall surface of the existing tunnel.

[0028] FIG. 6 is a top view of the controller 8 for operating the shoring installation device 4. Reference numeral 80 denotes a start switch. The start switch 80 is a switch for operating the start and stop of the shoring installation device 4. Reference numeral 81 denotes an emergency stop button. When the emergency stop button 81 is pressed, the shoring installation device 4 is brought to an emergency stop.

[0029] Reference numeral 82 denotes a clamp open / close switch. When the close switch 82A of the clamp open / close switch 82 is pressed, the clamps 433A, 433B of the shoring gripping unit 43 operate in the direction narrowing the gap between the clamp pieces 434A, 434B, thereby gripping the side steel support 50. When the open switch 82B of the clamp open / close switch 82 is pressed, the clamps 433A, 433B operate in the direction widening the gap between the clamp pieces 434A, 434B, thereby releasing the gripped state of the side steel support 50.

[0030] Reference numerals 83 to 86 denote first to fourth operating levers. For example, the first operating lever 83 to the third operating lever 85 are operating switches that can be tilted up, down, left, and right. The fourth operating lever 86 is an operating switch that can be tilted left and right. When the first operating lever 83 is operated up and down, the slide portion 412 of the slider 41 can be extended or retracted. On the other hand, when the first operating lever 83 is operated left and right, the rod portion 413 of the slider 41 can be rotated forward and backward, and as a result, the mounting arm 42 can be rotated left and right.

[0031] Operating the second operating lever 84 in the up-down direction causes the telescopic rod portion 422 of the mounting arm 42 to extend or retract. On the other hand, operating the second operating lever 84 in the left-right direction causes the base rod portion 421 of the mounting arm 42 to rotate about the rotation axis X3 with respect to the rod portion 413 of the slider 41 (in the direction of arrow D in FIG. 4). For example, the base rod portion 421 of the mounting arm 42 may be rotatable within a range of 90° about the rotation axis X3 so as to be switchable between a position (the state shown in FIG. 4) in which the longitudinal direction of the shoring gripping unit 43 (second frame portion 432) faces the lateral direction (left-right direction) of the shoring installation cart 1 and a position in which the longitudinal direction of the shoring gripping unit 43 (second frame portion 432) faces the front-rear direction of the shoring installation cart 1.

[0032] Furthermore, when the third operating lever 85 is operated in the up or down direction, the base rod portion 421 of the mounting arm 42 swings around the swing axis X4 relative to the rod portion 413 of the slider 41 (arrow E in FIG. 4). This allows the base rod portion 421 of the mounting arm 42 to perform a pitching motion relative to the main axis X1 of the slider 41. As an example, as shown in FIG. 4, the mounting arm 42 may be swingable around the swing axis X4 within a range of 90° so as to be switchable between a posture in which the arm axis X2 is perpendicular to the main axis X1, causing the mounting arm 42 to face vertically downward, and a posture in which the arm axis X2 is parallel to the main axis X1, causing the angle of elevation of the mounting arm 42 to be 0° (i.e., a posture in which the mounting arm 42 is horizontal).

[0033] When the third operating lever 85 is operated left or right, the first frame portion 431 of the shoring gripping unit 43 rotates around the rotation axis X5 (in the direction of arrow F in FIG. 5). This allows the shoring gripping unit 43 to perform pitching motion relative to the mounting arm 42. On the other hand, when the third operating lever 85 is operated left or right, the second frame portion 432 of the shoring gripping unit 43 rotates around the rotation axis X6 (in the direction of arrow G in FIG. 5). This allows the shoring gripping unit 43 to perform rolling motion relative to the mounting arm 42.

[0034] The actuator for driving the support installation device 4 may be an electric actuator, a hydraulic actuator, or the like, and there is no particular limitation on the drive source. The speed adjustment knob 87 is a speed adjustment knob for adjusting the rotation speed of the mounting arm 42. By operating the speed adjustment knob 87, the rotation speed of the mounting arm 42 can be increased or decreased. Reference numeral 88 is a speed adjustment knob for adjusting the hydraulic pump flow rate of the hydraulic actuator that drives the support installation device 4. Of course, the configuration of the controller 8 shown in Figure 6 is an example and can be modified as appropriate.

[0035] Next, the bottom steel shoring holding device 7 provided on the shoring installation cart 1 will be described. The bottom steel shoring holding device 7 is a device capable of holding a bottom (invert) steel shoring 90 (see FIG. 7). In this embodiment, the bottom steel shoring holding device 7 is disposed on the rear side of the shoring installation cart 1 (self-propelled platform 2). The bottom steel shoring holding device 7 has rails 71 extending along the front-to-rear direction of the shoring installation cart 1 and a hoist 72 provided movably along the rails 71, and can hold the bottom steel shoring 90 in a lifted state using the hoist 72. The rails 71 are provided so as to protrude rearward from the shoring installation cart 1 (self-propelled platform 2). The bottom steel shoring holding device 7 may be, for example, a monorail crane (a monorail crane). Of course, the specific structure of the bottom steel support holding device 7 is not particularly limited as long as it is capable of holding the bottom steel support 90.

[0036] The rails 71 of the bottom steel support holding device 7 may be fixed to the underside of the upper horizontal frame 23 of the self-propelled platform 2, for example. The hoisting machine 72 is attached so as to be movable along the rails 71, for example. The bottom steel support 90 is a steel support that is installed as needed along the bottom of an existing tunnel. A chain 73 for lifting the bottom steel support 90 is wound around the hoisting machine 72. Furthermore, a controller 74 is attached to the hoisting machine 72. The controller 74 can be used to move the hoisting machine 72 along the rails 71 and to perform operations such as winding and unwinding the chain 73 on the hoisting machine 72.

[0037] The procedure for a tunnel repair and reinforcement method using the support installation vehicle 1 according to this embodiment will be described below as an example.

[0038] 7 and 8 are diagrams illustrating a tunnel repair and reinforcement method using a shoring installation vehicle 1 according to an embodiment. Specifically, the diagram shows the shoring installation vehicle 1 set in a new construction area within an existing tunnel where new side steel shoring 50 is to be installed. FIG. 7 is a perspective view, and FIG. 8 is a side view. The shoring installation vehicle 1 is performing the work of installing side steel shoring 50 and bottom steel shoring 90 in order along the longitudinal direction (axial direction) of the existing tunnel, moving in the direction of travel in the diagram.

[0039] Note that the symbols 50L and 50R designate side steel supports that have already been installed along the inner wall of the tunnel. Based on the traveling direction of the support installation cart 1, 50L is a side steel support installed along the left tunnel inner wall, and 50R is a side steel support installed along the right tunnel inner wall. After being installed along the tunnel inner wall, the newly installed side steel support 50 is connected to the existing side steel supports 50L and 50R adjacent to it at the rear in the longitudinal direction of the tunnel via tie members to prevent it from collapsing.

[0040] Furthermore, the top ends of a pair of left and right side steel supports 50L, 50R installed within the same cross section of the existing tunnel are connected together. The connection of the top ends of the left and right side steel supports 50L, 50R may be performed, for example, by a worker stationed on the upper main work stage 27. The connectors connecting the top ends of the left and right side steel supports 50L, 50R are not particularly limited, and bolts and nuts may be used, or one-touch joint type connectors may be used.

[0041] 7 and 8, the reference numeral 90' denotes a steel support structure for the bottom of the tunnel that has already been installed at the bottom of the tunnel. In this embodiment, the installation work of the side steel shoring 50 is carried out in front of the shoring installation cart 1, and the installation work of the bottom steel shoring 90 is carried out behind the shoring installation cart 1. In the example shown in FIGS. 7 and 8, the bottom steel shoring 90 is held in a lifted state by the bottom steel shoring holding device 7 of the shoring installation cart 1. This is done, for example, by moving the shoring transport cart 60, on which the side steel shoring 50 and bottom steel shoring 90 to be used in construction are placed, through the space S1 below the self-propelled platform 2 to a position behind the shoring installation cart 1, and then hoisting and holding the bottom steel shoring 90 by the bottom steel shoring holding device 7. Each end of this bottom steel support 90 is connected to the legs of the existing side steel supports 50L, 50R (also marked with the symbol (I) in Figure 7), whose top ends are connected together. As a result, the left and right side steel supports 50L, 50R and the bottom steel support 90 are closed in a ring shape.

[0042] After the bottom steel shoring 90 is picked up by the bottom steel shoring holding device 7, the shoring transport cart 60 is again moved to a position in front of the shoring installation cart 1 through the space S1 below the self-propelled platform 2 (see Figures 7 and 8). Since the side steel shoring 50 and the bottom steel shoring 90 are long, they are placed on the shoring transport cart 60 in an orientation such that their long length direction (longitudinal direction) faces along the longitudinal direction of the tunnel (the front-to-rear direction of the shoring installation cart 1) and transported.

[0043] Next, the shoring installation device 4 is operated using the controller 8, and the side steel shoring 50 placed on the shoring transport cart 60 is picked up by the shoring gripping unit 43 of the shoring installation device 4. As a preparation stage for picking up the side steel shoring 50, the mounting arm 42 is set in a shoring pick-up position such that its arm axis X2 faces vertically downward and the clamps 433A, 433B of the shoring gripping unit 43 are aligned along the fore-and-aft direction of the shoring installation cart 1. This is to align the longitudinal direction of the side steel shoring 50 placed on the shoring transport cart 60 with the direction of the shoring gripping unit 43, making it easier for the shoring gripping unit 43 to smoothly grip the side steel shoring 50 when the mounting arm 42 is extended. Then, from this state, the mounting arm 42 is extended so that the side steel support 50 can be received between the clamp pieces 434A, 434B of the pair of clamps 433A, 433B in the support gripping unit 43 (see FIGS. 7 and 8). From this state, by operating the close switch 82A of the controller 8, the side steel support 50 is gripped by the clamps 433A, 433B in the support gripping unit 43.

[0044] Next, the mounting arm 42 is rotated 90° about the rotation axis X3, and the mounting arm 42 is switched to a shoring installation position in which the pair of clamps 433A, 433B of the shoring gripping unit 43 are aligned laterally (left-right) of the shoring installation cart 1. As a result, the longitudinal direction of the side steel shoring 50 gripped by the shoring gripping unit 43 is switched so that it is perpendicular to the front-to-rear direction of the shoring installation cart 1, i.e., the longitudinal direction of the tunnel. Here, when the mounting arm 42 is switched from the shoring loading position to the shoring installation position, the extension length of the slide portion 412 of the slider 41 is appropriately adjusted so that the side steel shoring 50, which is rotating while being gripped by the shoring gripping unit 43, does not interfere with or collide with the lower side work stages 29A, 29B of the shoring installation cart 1. The slide portion 412 of the slider 41 may be extended to an appropriate length in advance when the side steel support 50 is unloaded by the support installation device 4.

[0045] After switching the mounting arm 42 to the shoring installation position as described above, the erector arm 40 (slider 41, mounting arm 42) is operated with the side steel shoring 50 being held by the shoring holding unit 43, and the side steel shoring 50 is moved to the predetermined planned shoring installation position. At this time, the position of the side steel shoring 50 can be finely adjusted by simultaneously adjusting the position of the shoring holding unit 43 (pitching operation, rolling operation, etc.) as necessary. You can also adjust it quickly.

[0046] As described above, after the side steel support 50 is moved to the planned shoring installation position by the shoring installation device 4, the side steel support 50 is installed at the planned shoring installation position. For example, when installing a new side steel support indicated by the symbol 50R(J) in FIG. 7, the side steel support 50R(J) is grasped by the shoring grasping unit 43 and connected to the existing side steel support 50R(K) adjacent to the side steel support 50R(J) in the longitudinal direction of the tunnel via a connecting member. Also, in the existing tunnel, the top ends of the side steel support 50R(J) and the existing side steel support 50L(J) located in the same cross section as the side steel support 50R(J) are connected to each other. In addition, the work of connecting adjacent side steel supports 50 along the longitudinal direction of the tunnel using connecting materials may be carried out by workers stationed, for example, on the upper main work stage 27, upper side work stages 28A, 28B, or lower side work stages 29A, 29B.

[0047] Furthermore, when one-touch joint-type connectors are used to connect the top ends of the left and right side steel supports 50, the top ends of the side steel supports 50 to be connected may be connected to the corresponding side steel supports 50 while the shoring gripping unit 43 of the shoring installation device 4 grips the side steel supports 50 to be installed. In other words, the top ends of the left and right side steel supports 50 may be connected to each other by operating the shoring installation device 4 without manual intervention. Furthermore, panel mounting angle members may be installed between adjacent side steel supports 50 along the tunnel longitudinal direction to attach repair and reinforcement panels for repairing and reinforcing the existing tunnel inner wall. The panel mounting angle members can be installed using the upper main work stage 27, upper side work stages 28A and 28B, lower side work stages 29A and 29B, etc., as in the case of the installation of the connecting members described above.

[0048] After the left and right side steel supports 50 and bottom steel supports 90 installed in the existing tunnel are interconnected and closed into a ring, processes may be carried out, for example, such as pouring invert concrete at the bottom of the tunnel, fixing repair / reinforcement panels to panel mounting angle members erected between the side steel supports 50, and then filling the gaps on the backs of the repair / reinforcement panels installed along the inner wall of the tunnel with a filler such as grout mortar. Depending on the tunnel to be repaired / reinforced, the installation of bottom steel supports 90 may be omitted.

[0049] As described above, according to the shoring installation cart 1 and the repair and reinforcement method for an existing tunnel using the same according to this embodiment, the side steel shoring 50 placed on the shoring transport cart 60 or the like is picked up by the shoring installation device 4, and then the shoring gripping unit 43 can be moved to any position by operating the erector arm 40. This allows the side steel shoring 50 grasped by the shoring gripping unit 43 to be accurately moved and installed to the desired planned shoring installation position. Furthermore, since it is not necessary to manually move and install the side steel shoring 50 to the planned shoring installation position as in the conventional method, the manual workload can be reduced and work efficiency can be improved. This makes it possible to provide a mechanized construction technology that can install steel shoring at a predetermined planned shoring installation position.

[0050] Furthermore, the shoring installation cart 1 is equipped with a bottom steel shoring holding device 7 that holds bottom steel shoring 90 to be installed at the bottom of an existing tunnel. This allows for mechanized construction of not only the side steel shoring 50 but also the bottom steel shoring 90, further reducing the manual workload and improving work efficiency. In particular, the shoring installation cart 1 according to this embodiment has the shoring installation device 4 located on the front side of the shoring installation cart 1 (self-propelled platform 2), and the bottom steel shoring holding device 7 located on the rear side of the shoring installation cart 1 (self-propelled platform 2). This allows for the shoring installation work to be carried out on the front side of the shoring installation cart 1. Efficient construction is possible by performing installation work for the side steel support 50 using the placement device 4 and then performing work for the bottom steel support 90 using the bottom steel support holding device 7 on the rear side of the support installation cart 1.

[0051] Furthermore, the rails 71 of the bottom steel support holding device 7 are arranged to protrude rearward beyond the self-propelled platform 2. Therefore, when the bottom steel support 90 held by the bottom steel support holding device 7 is installed at the bottom of an existing tunnel, the bottom steel support 90 can be installed rearward beyond the self-propelled platform 2. In other words, the bottom steel support 90 can be installed without interfering with the self-propelled platform 2. As described above, the bottom steel support holding device 7 is not limited to the combination of the rails 71 and the hoist 72, and various configurations can be adopted as long as they can hold the bottom steel support 90. For example, a configuration in which the bottom steel support 90 can be held and installed using an erector device similar to the shoring installation device 4 may be adopted.

[0052] Furthermore, in the above specific examples, the shoring installation device 4 of the shoring installation cart 1 has been described as having a single erector arm 40, but the shoring installation device 4 may have multiple erector arms 40. For example, the shoring installation device 4 may be equipped with a pair of erector arms 40, and the pair of erector arms 40 may be used to install left and right side steel shoring 50L, 50R, respectively. Furthermore, the shoring installation cart 1 in this embodiment may also be applied to repair and reinforcement methods that do not involve installing repair and reinforcement panels along the inner wall surface of a tunnel. In other words, the shoring installation cart 1 can be applied to various repair and reinforcement methods for installing steel shoring in existing tunnels. For example, the support installation cart 1 can be suitably applied to repair and reinforcement methods in which steel supports are installed using the support installation device 4 of the support installation cart 1, and then shotcrete is sprayed onto the existing tunnel inner wall surface to integrate the steel supports installed on the tunnel inner wall surface.

[0053] The above describes embodiments of the present invention, but these are merely examples, and the present invention is not limited to these. Various modifications based on the knowledge of those skilled in the art are possible as long as they do not deviate from the spirit of the claims.

[0054] 9 is a diagram illustrating a shoring installation cart 1A according to a modified example. The shoring installation cart 1A has the same basic structure as the shoring installation cart 1 according to the above embodiment, but differs from the shoring installation cart 1 in the structure of the work stage mounted on the self-propelled platform 2. Below, components that are substantially the same as those in the shoring installation cart 1 will be given the same reference numerals and detailed explanations will be omitted, and the explanation will focus on the work stage.

[0055] As shown in Fig. 9, upper work stages 27A and 27B are installed side by side at the upper position of the self-propelled gantry 2. Lower side work stages 29A and 29B are installed at the lower position of the self-propelled gantry 2. The lower side work stages 29A and 29B are installed on horizontally extending lower side work stage support frames 26A and 26B. The lower side work stage support frames 26A and 26B are attached to the left and right leg frames 210A and 210B of the portal frame 21 via sliders 220. The sliders 220 are configured to slide freely along the vertically extending leg frames 210A and 210B, and the base ends of the lower side work stage support frames 26A and 26B are joined to the sliders 220. As a result, the left and right lower side work stages 29A, 29B are configured as movable stages that can slide (move up and down) freely in the vertical direction of the support installation cart 1 A. The driving source of the slider 220 is not particularly limited, and may be hydraulic or electric.

[0056] The state shown in the lower part of FIG. 9 is obtained by raising the lower side working stage 29A ( The figure shows a state in which the lower side work stages 29A, 29B are slid upwards (upwards) in the shoring installation cart 1A according to this modification. As described above, the lower side work stages 29A, 29B of the shoring installation cart 1A can be slid up and down (raised and lowered), so that the range in which a worker can work by riding on the lower side work stages 29A, 29B can be expanded in the vertical direction. This improves work efficiency when performing work using the shoring installation cart 1A. Furthermore, the lower side work stages 29A, 29B may be configured to be slidable in the left-right direction of the shoring installation cart 1A, or may be configured to be slidable in the front-rear direction as described above. That is, the lower side work stages 29A, 29B can be configured as movable stages that can slide in each of the up-down, left-right, front-rear, and rear directions of the shoring installation cart 1A. Furthermore, the upper work stages 27A, 27B can also be configured as movable stages that can slide in each of the up-down, left-right, front-rear, and rear directions of the shoring installation cart 1A. Regarding the raising and lowering of the work stages, it is more convenient if the lower side work stages 29A, 29B located at the lower level can be raised and lowered more freely than the upper work stages 27A, 27B located at the upper level of the self-propelled platform 2. For this reason, the upper work stages 27A, 27B may be fixed stages, and only the lower side work stages 29A, 29B may be movable stages. In this case, work efficiency can be improved while taking into consideration the manufacturing costs of the work cart. [Explanation of symbols]

[0057] 1...Dolly for installing shoring 2. Self-propelled platform 4...Shoring installation equipment 7...Steel shoring holding device for the bottom 8. Controller 40···Erector arm 41···Slider 42 Mounting arm 43. Shoring holding unit 44 Connecting unit

Claims

1. It is applied to the construction method of repairing and reinforcing an existing tunnel, and is a support installation cart for installing steel supports along the inner wall surface of the existing tunnel, a self-propelled platform capable of traveling inside the existing tunnel along its extension direction; A support installation device having a movable erector arm mounted on the self-propelled platform and a support gripping unit provided on the erector arm and capable of freely gripping and releasing the steel support; A support installation cart equipped with:

2. Further provided is a bottom steel support holding device for holding a bottom steel support to be installed at the bottom of the existing tunnel. The support installation vehicle according to claim 1.

3. The support installation device is provided on the front side of the self-propelled platform, and the bottom steel support holding device is provided on the rear side of the self-propelled platform. The support installation vehicle according to claim 2.

4. The bottom steel support holding device has a rail extending along the front-rear direction of the self-propelled platform, and a hoisting machine provided so as to be movable along the rail, The rail is provided so as to protrude rearward from the self-propelled platform. The support installation vehicle according to claim 3.

5. The self-propelled platform is a gantry-type platform having a portal frame, and a support transport cart for transporting the steel support can be stored in the space below the portal frame. A support installation vehicle according to any one of claims 1 to 4.

6. A repair and reinforcement method for an existing tunnel, comprising installing the steel supports on the inner wall surface of the existing tunnel using the support installation cart described in claim 1.

7. 7. The repair and reinforcement method for an existing tunnel according to claim 6, wherein the existing tunnel is a headrace tunnel.

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