JP7245701B2 - Automatic welding equipment for tunnel waterproof sheets - Google Patents

Description

The present invention relates to an automatic welding device for tunnel waterproof sheets.

Conventionally, waterproof sheets are laid on the inner surface of the tunnel pit and the inner surface of the shotcrete of the primary lining provided on the inner surface of the tunnel pit in the waterproof structure for stopping water leakage from the ground into the tunnel. is being done. In addition, as a water stop structure for the tunnel, the waterproof sheet is placed on the pedestal against the inner surface of the tunnel pit and the inner surface of the shotcrete of the primary lining. The gap between the inner surface and the waterproof sheet is filled with a back-filling filler, etc. to eliminate the gap on the back of the waterproof sheet, and the surface of the waterproof sheet is made uneven regardless of the uneven shape of the inner surface of the tunnel or the inner surface of the sprayed concrete. There is also known a construction method for stretching in a smooth state without cracks (hereinafter referred to as "smooth back tunnel lining construction method") (see, for example, Patent Document 1).

When using the smooth-back tunnel lining method, it is common to weld the ends of the waterproof sheets adjacent to each other in the axial direction of the tunnel on site. For example, FIG. 1 is a diagram showing the construction procedure of a conventional tunnel water stop structure. In the case of the construction method shown in FIG. 1, the first waterproof sheet 101p is placed on the sheet mount 104 with the front end portion 101b folded back, and in this state, the shotcrete 103 in which the shoring 102 is embedded is placed. , the air bulk 105 is inflated to close the filling space of the filling material 106, and the filling material 106 is filled into the back side of the first waterproof sheet 101p through the injection tube 107 (Fig. 1(a)). , see (b)). After that, the second waterproof sheet 101q is placed on the sheet base 104 with the rear end portion 101a folded back, and in this state it is fixed at a predetermined position adjacent to the first waterproof sheet 101p. The back side of the second waterproof sheet 101q is filled with a filler 106 (see FIGS. 1(c) and 1(d)).

Then, the front end portion 101b of the folded first waterproof sheet 101p and the rear end portion 101a of the second waterproof sheet 101q are welded together by a welding machine 108 (see FIG. 1(e)). The welded portion 110 is folded back, and the tip of the welded portion 110 is welded to the second waterproof sheet 101q or the like by a hot air welder 109 (see FIG. 1(f)).

JP-A-2002-21492 JP 2015-86688 A

However, in the conventional tunnel waterproofing construction, when the ends of the waterproof sheets adjacent in the tunnel axial direction are welded together, it is necessary for a worker to operate the welder. As a welding machine for face-to-face welding, there is also known a welding machine of a type in which a pair of heating rollers that heat while sandwiching and pressing the ends of the overlapped sheets from both sides is rotated by a motor or the like and welded. In order to weld the ends of the waterproof sheets that are adjacent in the axial direction to each other along the tunnel circumference, it is necessary for the worker to guide the welding machine along a welding line that has a shape similar to that of the tunnel. There was a fact that labor and time were forced. In order to perform face-to-face welding while guiding the welding machine along a welding line that has a shape similar to that of the tunnel, distortion is likely to occur at the welding point unless the worker is skilled. There is a problem that the filling of the lining concrete is likely to be damaged and voids are likely to be generated.

The present invention has been made in view of the above-mentioned problems, and its object is to manually weld the ends of waterproof sheets adjacent in the axial direction of a tunnel in water stoppage construction. To provide a technique capable of improving work accuracy and workability by enabling work to be performed without requiring.

The present invention for solving the above problems employs the following means. That is, the automatic welding device for tunnel waterproof sheets according to the present invention is fixed to a traveling base capable of traveling along rails laid along the axial direction of the tunnel, and extends in the shape of an arch along the circumferential direction of the tunnel. a welding machine guide rail; a self-propelled face-to-face welding machine provided on the welding machine guide rail and capable of traveling along the welding machine guide rail;
The self-propelled face-to-face welding machine includes a pair of rotating shafts for welding having rotation axes parallel to each other, a heater for heating the ends of a pair of waterproof sheets to be welded, and the rotating shaft for welding. a welding unit including a pair of welding rollers coaxially fixed to each of the pair; a rotary drive source for rotating the pair of rotating shafts for welding in opposite directions;
and the self-propelled face-to-face welding machine rotates the waterproof sheet by the pair of welding rollers rotated in opposite directions in a state where the ends of the waterproof sheet heated by the heater are superimposed on each other. The ends of the waterproof sheet are automatically welded together along the circumferential direction of the tunnel by traveling in one direction along the guide rail for the welding machine while pressing the ends of the waterproof sheet against each other.

Here, in the self-propelled face-to-face welding machine, the pair of welding rollers rotates in opposite directions while pinching the ends of the waterproof sheet so that the sheet is moved along the guide rail for the welding machine. You can drive yourself.

In addition, the self-propelled face-to-face welding machine has a sheet guide part that is provided on the front side of the welding part in the welding direction and guides the ends of the pair of waterproof sheets toward the welding part, The sheet guide portion receives the ends of the pair of waterproof sheets and has a pair of guide plates for guiding the outer surfaces of the received ends of the pair of waterproof sheets, and between the pair of guide plates. The width of the formed guide space may be narrowed toward the welded portion.

Further, the sheet guide portion includes a height adjusting portion for aligning the height of the end portions of the waterproof sheets by contacting the end surfaces of the ends of the waterproof sheets received in the guide space on the inner side of the tunnel. may be provided.

In addition, the self-propelled face-to-face welder is suspended in order to prevent the self-propelled face-to-face welder from slipping off the guide rail for the welder while allowing it to travel along the guide rail for the welder. A suspension device for hanging may also be provided.

Further, the suspension device is a balancer device attached to the traveling base, and the balancer device includes a rotating drum having a tapered outer peripheral surface and wound around the rotating drum from the large diameter side to the small diameter side of the rotary drum. It may have a wire rope to be taken and a torque applying section for applying torque to the rotating drum in a direction of winding the wire rope.

According to the present invention, in tunnel waterproofing construction, it is possible to weld the ends of waterproof sheets adjacent to each other in the axial direction of the tunnel without manpower, thereby improving work accuracy and workability. We can provide technology that can improve

FIG. 1 is a diagram showing a construction procedure for a conventional tunnel water stop structure. FIG. 2 is a diagram for explaining the tunnel water stop structure according to the first embodiment. FIG. 3 is a diagram showing a part of the side surface of the waterproof sheet spreading device according to the first embodiment. FIG. 4 is a front view of the waterproof sheet spreading device 30 according to the first embodiment. FIG. 5 is a front view of a self-propelled face-to-face welding machine and its surroundings in the automatic welding device according to the first embodiment. 6 is a rear view of a self-propelled face-to-face welding machine and its surroundings in the automatic welding device according to Embodiment 1. FIG. 7 is a right side view of the self-propelled face-to-face welding machine in the automatic welding device according to Embodiment 1. FIG. 8 is a top view of a self-propelled face-to-face welding machine in the automatic welding apparatus according to Embodiment 1. FIG. FIG. 9 is a detailed structural diagram of the heater according to the first embodiment. 10A and 10B are diagrams for explaining a situation in which the ends of the waterproof sheet are welded together by the automatic welding apparatus according to the first embodiment. FIG. 11A and 11B are diagrams for explaining a situation in which the ends of the waterproof sheet are welded together by the automatic welding apparatus according to the first embodiment. FIG. FIG. 12 is an overall front view of an automatic welding device according to Embodiment 2. FIG. FIG. 13 is a diagram showing an installation mode of the main body case in the balancer device according to the second embodiment. FIG. 14 is a diagram illustrating the detailed structure of the balancer device according to the second embodiment. FIG. 15 is a schematic configuration diagram of a rotating drum in a balancer device according to Embodiment 2 as viewed from the side. FIG. 16 shows a state in which the self-propelled face-to-face welder according to the second embodiment is suspended by a balancer device when it travels in a downward slope section of the guide rail for the welder. showing. 17 is an overall front view of an automatic welding device according to Embodiment 3. FIG. 18 is a right side view of the self-propelled face-to-face welding machine according to Embodiment 3. FIG. FIG. 19 illustrates a state in which the running power transmission rail is pinched between the first running power transmission rotary roller and the second running power transmission rotary roller in the self-propelled face-to-face welding machine according to the third embodiment. It is a figure to do. FIG. 20 is a diagram for explaining a situation in which a waterproof sheet is laid on the inner surface of shotcrete provided on the inner surface of a tunnel.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 2 is a diagram for explaining the tunnel water stop structure according to the first embodiment. The tunnel water stop structure of the first embodiment is provided in a tunnel 2 formed in the natural ground 1. As shown in FIG. Reference numeral 21 in FIG. 2 denotes an arch portion of the tunnel 2, and reference numeral 22 denotes a side wall portion of the tunnel 2. As shown in FIG. 2, the inverted portion of the tunnel 2 is omitted.

In the tunnel 2, a shotcrete 3 as a primary lining material is provided along the inner surface 25 of the tunnel pit. (not shown in ) are embedded. A substantially planar waterproof sheet 5 is provided inside the shotcrete 3 as a waterproofing work, and the waterproof sheets 5 are joined together and provided over the entire tunnel circumferential direction and tunnel axial direction. The waterproof sheet 5 is, for example, substantially rectangular with a predetermined length to continuously cover the arch portion 21 and the side wall portion 22 of the tunnel 2 and a predetermined width in the axial direction of the tunnel. A filler 6 is filled between the waterproof sheet 5 and the inner surface of the shotcrete 3 and solidified. It is In addition, a secondary lining concrete 7 is cast inside the waterproof sheet 5 (on the inner side of the tunnel) over the entire tunnel circumferential direction and tunnel axial direction, and is fixed to the inner surface of the waterproof sheet 5 .

The waterproof sheet 5 may be, for example, a laminated waterproof sheet in which a cushioning material is laminated on a waterproof sheet layer. When the above laminated waterproof sheet is used for the waterproof sheet 5, the filler material is placed in a state in which the waterproof sheet 5 is arranged so that the cushioning material faces the shotcrete 3 and the waterproof sheet layer faces the inner space of the tunnel. It is preferable to fix the waterproof sheet 5 to the shotcrete 3 by means of 6 . Moreover, the waterproof sheet layer of the waterproof sheet 5 can be formed of an appropriate material having waterproofness and flexibility, such as a synthetic resin such as EVA resin having excellent flexibility, or a synthetic rubber. Moreover, the cushioning material of the waterproof sheet 5 is, for example, substantially planar and substantially rectangular in size substantially the same as the waterproof sheet layer, and can be made of an appropriate material having cushioning properties. The cushioning material of the waterproof sheet 5 is preferably water-permeable and can be impregnated with the filler 6, and can be, for example, a nonwoven fabric, a three-dimensional mesh, or a laminated material thereof.

Next, a description will be given of a waterproof sheet stretching device for performing tunnel water stoppage construction for the tunnel 2 in Embodiment 1. FIG. FIG. 3 is a diagram showing a part of the side surface of the waterproof sheet spreading device 30 according to the first embodiment. FIG. 4 is a front view of the waterproof sheet spreading device 30 according to the first embodiment.

The waterproof sheet spreading device 30 includes a traveling base 32 that can travel along rails 31 laid along the tunnel axis direction. The traveling base 32 is frame-shaped with two pairs of legs 33, a pedestal 34 provided between the upper parts of the legs 33, and scaffolds 35 provided between the legs 33 and the pedestal 34 at appropriate locations. formed. Running wheels 36 are provided on the legs 33 of the running base 32. The running wheels 36 allow the running base 32 to move forward and backward along the extending direction of the rails 31 (that is, the tunnel axis direction). It is free to run.

Further, on the outer peripheral surface of the traveling base 32, a sheet mount 11 capable of supporting the waterproof sheet 5 in a stretched state is provided. The sheet mount 11 has a shape along the inner wall surface of the tunnel 2 (for example, a shape along the cross-sectional shape of the inner space of the tunnel 2). The inner wall surface of the tunnel 2 here is, for example, the surface of the shotcrete 3 covering the inner surface 25 of the tunnel. Further, since the sheet mount 11 supports the waterproof sheet 5 in a stretched manner corresponding to the circumferential length (cross-sectional shape) of the tunnel 2, it can be freely expanded in width, for example, by a plurality of hinges or the like.

Reference numeral 12 shown in FIGS. 3 and 4 denotes a seat pedestal support frame for supporting the seat pedestal 11 . In addition, the "sheet existing area" shown in FIG. indicates the section in which In addition, the "sheet installation area" shown in FIG. area. That is, in the "sheet new area", the filling material 6 and the waterproof sheet 5 have not yet been applied, and the surface of the shotcrete 3 is exposed. As shown in FIG. 3, the construction of the waterproof sheet 5 and the filler 6 in the new sheet area is carried out by arranging the traveling base 32 around the boundary between the existing sheet area and the new sheet area, and placing the waterproof sheet 5 on the sheet mount 11. It is carried out by filling a filler 6 between the shotcrete 3 and the sheet mount 11 in the stretched state.

In this embodiment, prior to the work of filling the filler 6 into the new sheet area, the end of the waterproof sheet 5 stretched on the sheet mount 11 and the existing sheet area adjacent to the new sheet area have already been filled. The ends of the finished waterproof sheet 5 are welded together using an automatic welding device 40, which will be described later. After the ends of the waterproof sheet 5 are welded together, the filler 6 is filled in the area where the sheet is newly installed, and the waterproof sheet 5 is fixed to the surface of the filler 6 . In this specification, "the end of the waterproof sheet 5" refers to the end of the waterproof sheet 5 located on the inner side of the tunnel.

Next, the automatic welding device 40 of the waterproof sheet stretching device 30 will be described. The waterproof sheet spreading device 30 includes an automatic welding device 40 for automatically facing and welding the ends of the waterproof sheets 5 adjacent in the tunnel axial direction in the tunnel 2 . As shown in FIG. 3 , the automatic welding device 40 is provided on the rear side of the travel base 32 . The automatic welding device 40 includes an arch-shaped welding machine guide rail 60, a self-propelled face-to-face welding machine 80 provided on the welding machine guide rail 60, and the like.

4 schematically shows a state in which the automatic welding device 40 is viewed from the rear side of the travel base 32 along the axial direction of the tunnel 2. As shown in FIG. 4, illustration of a part of the travel base 32 is omitted. The welder guide rail 60 is an arch-shaped rail member having a similar shape (approximate shape) to the inner wall surface S1 of the tunnel 2 (for example, the surface of the shotcrete 3 or the surface of the filler 6), It extends along the circumferential direction of the tunnel 2 . In the example shown in FIG. 4, the inner wall surface S1 of the tunnel 2 has a horseshoe shape. The welder guide rail 60 in the automatic welding device 40 is formed in a horseshoe shape similar in shape to the inner wall surface S1 of the tunnel 2 and relatively smaller than the inner wall surface S1. However, the welder guide rail 60 only needs to have a similar shape (approximate shape) to the inner wall surface S1 of the tunnel 2, and other shapes can be adopted according to the cross-sectional shape of the tunnel. The welder guide rail 60 is arranged so that its circumferential direction (longitudinal direction) extends in a plane orthogonal to the tunnel axial direction.

The self-propelled face-to-face welding machine 80 is attached to the welding machine guide rail 60 and is free to travel along the extending direction of the welding machine guide rail 60 . Reference numeral 91 shown in FIG. 4 denotes a support frame for supporting the guide rails 60 for welding machine and the frame 12 for supporting the seat frame. . The welding machine guide rails 60 and the seat support frame 12 are supported by the support frame 91 and arranged at predetermined positions.

FIG. 5 is a front view of the self-propelled face-to-face welding machine 80 and its surroundings in the automatic welding device 40 according to the first embodiment. FIG. 6 is a rear view of the self-propelled face-to-face welding machine 80 and its surroundings in the automatic welding device 40 according to the first embodiment. FIG. 7 is a right side view of the self-propelled face-to-face welding machine 80 in the automatic welding device 40 according to the first embodiment. FIG. 8 is a top view of a self-propelled face-to-face welding machine 80 in the automatic welding device 40 according to the first embodiment.

As shown in FIG. 7, the welding machine guide rail 60 is supported by a support frame 91 via a rail support member 93 attached to the support frame 91 . The shape of the welding machine guide rail 60 shown in FIG. 7 shows a cross section of each of these rails cut in a direction orthogonal to the longitudinal direction thereof.

The self-propelled face-to-face welding machine 80 has a welding machine main body 81 and a welding machine stand 82 . Although the shape of the welder main body 81 is not particularly limited, for example, the welder main body 81 has a substantially rectangular parallelepiped housing 810 . A housing 810 of the welding machine main body 81 accommodates a drive motor 88 (see FIG. 7) as a rotational drive source, a control section having a control board, various mechanical and electronic parts, and the like. Here, reference numeral 810a denotes the front surface of the welding machine main body 81, reference numeral 810b denotes the rear surface of the welding machine main body 81, reference numeral 810c denotes the left side surface of the welding machine main body 81, reference numeral 810d denotes the right side surface of the welding machine main body 81, and reference numeral 810e denotes the welding machine. The upper surface of the main body 81, 810f, is the bottom surface of the welding machine main body 81. As shown in FIG.

The welding machine stand 82 in the self-propelled face-to-face welding machine 80 is attached to the rear surface 810 b side of the welding machine main body 81 . The welding machine gantry 82 has a flat gantry body portion 83 . Reference numeral 83a denotes the front surface of the gantry main body portion 83, and reference numeral 83b denotes the rear surface of the gantry main body portion 83. As shown in FIG. The welding machine mount 82 has a first fixed wall 831 and a second fixed wall 832 vertically erected forward from a front surface 83a. The first fixed wall 831 and the second fixed wall 832 are arranged to face each other, and the first fixed wall 831 and the second fixed wall 832 are spaced apart by a dimension approximately equal to the width dimension of the welder main body 81 . A housing 810 of the welding machine main body 81 is positioned and fixed while being sandwiched between a first fixed wall 831 and a second fixed wall 832 . Further, the gantry main body portion 83 of the welding machine gantry 82 is arranged in parallel with the rear surface 810 b of the welding machine main body 81 . The method of fixing the housing 810 of the welding machine main body 81 to the welding machine base 82 is not particularly limited.

Further, the gantry main body portion 83 of the welding machine gantry 82 has a plurality of running wheels 84 . In this embodiment, the plurality of running wheels 84 are arranged on the rear surface 83b (see FIG. 6) side of the gantry main body 83. As shown in FIG. Further, the running wheels 84 are provided at the four corners of the gantry body portion 83 respectively. Hereinafter, the pair of running wheels 84 attached to the upper part of the gantry body 83 will be referred to as "upper running wheels 84a", and the pair of running wheels 84 attached to the lower part of the gantry body 83 will be referred to as "lower running wheels". 84b". In this embodiment, the running wheels 84 are arranged in a rectangular shape with respect to the gantry main body 83, but other arrangement shapes such as a trapezoid, a rhombus, and the like may be adopted.

As shown in FIGS. 7 and 8, the running wheels 84 of the gantry main body 83 are composed of a shaft portion 841 erected vertically from the gantry main body portion 83 and a traveling roller portion rotatably supported by the shaft portion 841. 842. A shaft portion 841 of the running wheel 84 is fixed to the gantry body portion 83 . The running roller portion 842 is composed of a wheel portion 842A having a cylindrical shape and a pair of stopper portions 842B provided so as to sandwich the wheel portion 842A. The drop-off prevention stopper portion 842B is a cylindrical body that is one step larger than the wheel portion 842A, and is used to prevent the running wheels 84 (running roller portions 842) of the gantry body portion 83 from coming off the welding machine guide rail 60. function.

The welding machine stand 82 in this embodiment engages the upper running wheels 84 a with the upper edge 61 of the welding machine guide rail 60 , and engages the lower running wheels 84 b with the lower edge 62 of the welding machine guide rail 60 . The welding machine guide rail 60 is sandwiched from above and below by the upper running wheel 84a and the lower running wheel 84b. ). Further, by rotating the running roller portion 842 with respect to the shaft portion 841 of the running wheel 84 in the gantry body portion 83 , the self-propelled face-to-face welding machine 80 can freely travel along the welding machine guide rail 60 . The running wheel 84 of the gantry main body 83 has a bearing 843 provided between a shaft portion 841 and a running roller portion 842 , and the running roller portion 842 supported by the shaft portion 841 is attached to the shaft portion 841 . rotatable smoothly. In addition, the distance between the upper running wheel 84a and the lower running wheel 84b in the welder mount 82 is appropriately adjusted so that the self-propelled face-to-face welder 80 can smoothly run along the guide rail 60 for the welder. Good to keep.

Next, the welder main body 81 of the self-propelled face-to-face welder 80 will be described. As shown in FIGS. 5 to 8, the welding machine main body 81 includes a welding portion 85, a sheet guide portion 87, a heating device 89, and the like. The welding portion 85 includes a pair of rotating shafts for welding 851A and 851B (pair of rotating shafts for welding) having rotation axes parallel to each other, and a pair of rotating shafts for welding 851A and 851B (pair of rotating shafts for welding). It has a pair of welding rollers 852A and 852B (pair of welding rollers), a heater 890, and the like. The welding roller 852A is a rotating roller member coaxially attached to the tip of the welding rotating shaft 851A. The welding roller 852B is a rotating roller member coaxially attached to the tip of the welding rotating shaft 851B. The welding roller 852A and the welding roller 852B have the same structure, and the circumferential lengths of the outer peripheral surfaces thereof are equal to each other. The pair of rotating shafts 851A and 851B for welding are accommodated inside cylindrical sleeves 850A and 850B, which are cylindrical members that stand vertically upward from the upper surface 810e of the housing 810 of the welding machine main body 81, respectively. In addition, the circumferential lengths of the rotating shaft for welding 851A and the rotating shaft for welding 851B are equal to each other. Also, the welding rollers 852A and 852B may be made of rubber.

In this embodiment, the pair of welding rollers 852A and 852B (the pair of rotating shafts 851A and 851B for welding) are arranged such that the arrangement direction C1 (see FIG. 8) of the respective center axes is parallel to the tunnel axis direction. is set to In the following description, of the pair of welding rollers 852A and 852B, the welding roller 852A arranged relatively on the front side of the welding machine main body 81 is referred to as a "first welding roller 852A", and is relatively on the rear side. The fusing roller 852B arranged in the second fusing roller 852B is referred to as a "second fusing roller 852B". Of the pair of rotating shafts for welding 851A and 851B, the rotating shaft for welding 851A that is arranged relatively on the front side of the welding machine main body 81 is referred to as "first rotating shaft for welding 851A". The rotary shaft for welding 851B arranged on the rear side is called the "second rotary shaft for welding 851B".

In this embodiment, the drive motor 88 is actuated so that the first welding rotation shaft 851A and the second welding rotation shaft 851B rotate synchronously in opposite directions. "Synchronous rotation" as used herein means that the angular velocities are equal when the rotating body rotates. Here, the output shaft of the drive motor 88 may be connected to either the first rotating shaft for welding 851A or the second rotating shaft for welding 851B. As shown in FIG. 7 and the like, the first rotating shaft for welding 851A and the rotating shaft for second welding 851B are provided with gears G1 and G2 that mesh with each other. As a result, the first rotary shaft 851A for welding and the second rotary shaft 851B for welding rotate in opposite directions at equal angular velocities. Further, as described above, the pair of welding rollers 852A and 852B are fixed coaxially with the welding rotating shafts 851A and 851B, respectively, and the circumferential lengths of the pair of welding rollers 852A and 852B are equal. The welding rollers 852A and 852B also rotate in opposite directions at equal angular velocities. Here, the direction of rotation of the first welding roller 852A when the driving motor 88 is operated is indicated by arrow D1 in FIG. 8, and the direction of rotation of the second welding roller 852B is indicated by arrow D2 in FIG.

Next, the heating device 89 provided in the welding machine body 81 of the self-propelled face-to-face welding machine 80 will be described. The heating device 89 is a device for heating the ends of the pair of waterproof sheets 5 to be welded using the self-propelled face-to-face welding machine 80. For example, the heating device 89 includes a heater 890 such as a heat iron. there is The heating device 89 has a cable 891 for supplying electric power to the heater 890, covers 892A and 892B for covering the cable 891, the heater 890, etc. (see FIG. 8). The cable 891 is connected to a power supply (not shown) arranged in the housing 810 of the welding machine main body 81 and a heater 890 , and the heater 890 is supplied with power from the power supply through the cable 891 to heat the heater. do.

FIG. 9 is a detailed structural diagram of the heater 890 according to the first embodiment. Heater 890 has a first side 893 and a second side 894 . The first side surface 893 is composed of a planar flat portion 893A and a curved curved surface portion 893B. Similarly, the second side surface portion 894 is composed of a planar planar portion 894A and a curved curved surface portion 894B. Although details will be described later, when the ends of a pair of waterproof sheets 5 are welded together by the self-propelled face-to-face welding machine 80, the end of one waterproof sheet 5 is passed along the first side surface 893 and the other waterproof sheet is welded. The heater 890 heats the ends of the pair of waterproof sheets 5 by passing the ends of the sheets 5 along the second side surface 894 .

Here, the curved surface portion 893B of the first side surface 893 and the curved surface portion 894B of the second side surface 894 are formed as curved surfaces having substantially the same curvature as the first welding roller 852A and the second welding roller 852B, respectively. Then, when the first welding roller 852A and the second welding roller 852B are rotationally driven in opposite directions (D1 and D2 directions shown in FIG. 8), the curved surface portion 893B of the first side surface 893 and the first welding roller 852A are rotated. and the end of the other waterproof sheet 5 that has passed between the curved surface portion 894B of the second side surface 894 and the second welding roller 852B are overlapped. By passing between the first welding roller 852A and the second welding roller 852B, it is pinched (pressurized) from both sides.

Next, the sheet guide portion 87 provided in the welding machine main body 81 in the self-propelled face-to-face welding machine 80 will be described. As shown in FIGS. 5 and 6, the sheet guide portion 87 is arranged on the front side of the welding direction of the welding portion 85 of the welding machine main body 81, and directs the ends of the pair of waterproof sheets 5 toward the welding portion 85. It is a member for guiding. The sheet guide portion 87 is a pair of first guide plates that receive the ends of the pair of waterproof sheets 5 and guide the outer surfaces 5a (see FIG. 7) at the ends of the pair of waterproof sheets 5 that have been received. It has a plate 871 and a second guide plate 872 . A space sandwiched between the first guide plate 871 and the second guide plate 872 serves as a guide space 873 for guiding the ends of the pair of waterproof sheets 5 received inside. The width narrows toward the welded portion 85 .

Further, in the sheet guide portion 87 in this embodiment, a member for aligning the heights of the ends of the pair of waterproof sheets 5 by coming into contact with the end surfaces of the ends of the waterproof sheets 5 received in the guide space 873. are provided. 5 and 6 show the positions of the height adjusters 874 and 875 with dashed lines. As illustrated, the height adjustment portions 874 and 875 are arranged in the area below the guide space 873 in the sheet guide portion 87 . The height adjusting portions 874 and 875 of the sheet guide portion 87 have flat upper surfaces to form guide surfaces UF. The guide surfaces UF of the height adjustment portions 874 and 875 are arranged at the same height. The ends of the waterproof sheets 5 received in the guide space 873 of the sheet guide portion 87 are guided by the welded portion 85 while the end surfaces are brought into contact (sliding contact) with the guide surfaces UF of the height adjustment portions 874 and 875. be. Since the guide surfaces UF of the height adjustment portions 874 and 875 are arranged at the same height as described above, the end surfaces of the pair of waterproof sheets 5 are guided while the guide surfaces UF are in sliding contact with each other. , the pair of waterproof sheets 5 can be welded at the welding portion 85 in a state in which the heights of the end faces of the waterproof sheets 5 are aligned.

As shown in FIG. 7, the self-propelled face-to-face welding machine 80 according to the present embodiment configured as described above is in a state in which the ends of a pair of waterproof sheets 5 hanging down from the tunnel inner wall surface S1 are overlapped. By sandwiching between a pair of welding rollers 852A and 852B and heating in a pinched state, the ends of the waterproof sheet 5 are welded in a state where they face each other. Specifically, as shown in FIG. 3, a travel base 32 is installed at the boundary between the existing sheet area and the new sheet area of the tunnel 2, and the waterproof sheet 5 for newly installing in the new sheet area is mounted on the sheet mount 11. The sheet mount 11 is set at a predetermined position close to the shotcrete 3 in the new sheet installation area. From this state, the automatic welding device 40 attached to the welding machine guide rail 60 is arranged on the side of the first end portion 60a of the welding machine guide rail 60 as shown in FIG. Reference numeral 60b shown in FIG. 10 denotes a second end portion of the guide rail 60 for welding machine opposite to the first end portion 60a, and reference numeral 60c denotes a top portion of the guide rail 60 for welding machine. The top portion 60c of the guide rail 60 for welding machine is located in the central portion of the guide rail 60 for welding machine.

Then, as shown in FIG. 11, the end of the waterproof sheet (hereinafter also referred to as "existing waterproof sheet") 5 on the side of the existing sheet area and the new waterproof sheet (hereinafter referred to as "newly installed waterproof sheet") in the new sheet area The existing waterproof sheet 5 is inserted between the first welding roller 852A and the second welding roller 852B while inserting the end portion of the waterproof sheet 5 into the guide space 873 of the sheet guide portion 87 in the automatic welding device 40. and the newly installed waterproof sheet 5 are superimposed and sandwiched, the self-propelled face-to-face welding machine 80 is operated.

The self-propelled face-to-face welding machine 80 operates, for example, by receiving an operation of an operation button provided on the welding machine main body 81 by a user or receiving an operation of a remote controller, and automatically welds the ends of the waterproof sheet 5 together. Start welding. Specifically, when the control unit (not shown) of the self-propelled face-to-face welding machine 80 detects an instruction to start automatic welding via the user's operation of an operation button, remote controller, or the like, the heating device 89 and Drive motor 88 is activated. By operating the heating device 89, the heater 890 becomes hot, and the inner surfaces 5b of the pair of waterproof sheets 5 in contact with the heater 890 are heated, resulting in the inner surfaces 5b of the respective waterproof sheets 5 being melted. In this way, the ends of the pair of waterproof sheets 5 melted by heating by the heater 890 pass between the pair of welding rollers 852A and 852B, which are rotated in opposite directions by the drive motor 88, and pressed. By doing so, the ends of the pair of waterproof sheets 5 can be welded together.

The self-propelled face-to-face welding machine 80 rotates the pair of welding rollers 852A and 852B in opposite directions while the ends of the pair of waterproof sheets 5 are sandwiched between the pair of welding rollers 852A and 852B as described above. By being rotationally driven, it can be made to run by itself along the welding machine guide rail 60 using the rotational driving force. Specifically, the rotational driving force of a pair of welding rollers 852A and 852B that are rotationally driven in a state in which the ends of the pair of waterproof sheets 5 are sandwiched between the upper edge 61 and the upper edge 61 of the welding machine guide rail 60 is rotated. By rotating each running wheel 84 of the welding machine base 82 engaged with the lower edge 62 , a driving force can be obtained to propel the self-propelled face-to-face welding machine 80 along the welding machine guide rail 60 . In this way, the automatic welding device 40 of this embodiment has a pair of welding rollers 852A that are driven to rotate in opposite directions while the ends of the pair of waterproof sheets 5 heated by the heater 890 are overlapped. , 852B, and travels in one direction along the guide rail 60 for the welding machine while pressing the ends of the waterproof sheet 5 together, thereby automatically welding the ends of the waterproof sheet 5 sequentially along the tunnel circumferential direction. be able to.

As in the above example of use, when the first end portion 60a of the guide rail 60 for the welding machine is set as the start position of the automatic sheet welding, the automatic welding device 40 automatically welds the ends of the waterproof sheet 5 to each other while welding. The automatic welding device 40 is self-propelled along the welding machine guide rail 60 until it reaches a second end 60b (see FIG. 10) opposite to the first end 60a of the welding machine guide rail 60. As shown in FIG. Here, since the welding machine guide rail 60 has a shape substantially similar to the shape of the inner wall surface S1 of the tunnel 2, automatic welding is performed from the first end 60a to the second end 60b of the welding machine guide rail 60. By automatically welding the ends of the sheets while the device 40 is running by itself, the ends of the existing waterproof sheet 5 and the newly installed waterproof sheet 5 can be easily and automatically welded along the tunnel circumferential direction. According to the automatic welding device 40 of the present embodiment, in tunnel waterproofing construction, the ends of the existing waterproof sheet and the new waterproof sheet are aligned at the boundary between the existing sheet area and the new sheet area adjacent to each other in the axial direction of the tunnel. Welding can be easily performed without manpower, thereby improving work accuracy and workability.

Further, the welding machine guide rail 60 in this embodiment extends in an arch shape along the circumferential direction of the tunnel 2, and has a shape substantially similar (approximate shape) to the inner wall surface S1 of the tunnel 2 in particular. Therefore, the ends of the waterproof sheet 5 can be welded together along the shape of the inner wall surface S1 of the tunnel 2 with high accuracy. In addition, in this embodiment, the rotational driving force of the pair of welding rollers 852A and 852B for welding the ends of the waterproof sheet 5 is utilized as the driving force of the self-propelled face-to-face welding machine 80, thereby Since the self-propelled face-to-face welding machine 80 is self-propelled along the guide rail 60, the welding speed at which the ends of the waterproof sheet 5 are welded together in the welding progress direction and the speed along the guide rail 60 for the welding machine The traveling speed at which the self-propelled face-to-face welding machine 80 travels can be accurately adjusted. As a result, it is possible to suitably suppress the occurrence of distortion at the welded portions of the ends of the waterproof sheet 5 .

Further, according to the self-propelled face-to-face welding machine 80 of the present embodiment, the sheet guide is provided on the front side of the welding direction of the welding part 85 and guides the ends of the pair of waterproof sheets 5 toward the welding part 85 . A part 87 is provided. In the sheet guide portion 87 , a guide space 873 formed between a first guide plate 871 and a second guide plate 872 (a pair of guide plates) narrows toward the welding portion 85 . According to this, in the process of guiding the ends of the pair of waterproof sheets 5 received from the receiving opening 873a formed at the end of the sheet guide portion 87 on the front side in the welding direction to the welding portion 85 through the guide space 873, The ends of the pair of waterproof sheets 5 can be gradually squeezed. That is, the distance between the inner surfaces 5b of the pair of waterproof sheets 5 received in the guide space 873 can be gradually narrowed, and the pair of waterproof sheets 5 can be stacked without excessive bending or wrinkling. In the combined state, it can be guided between the pair of welding rollers 852A and 852B and welded neatly. As a result, when the ends of the pair of waterproof sheets 5 are automatically welded together along the circumferential direction of the tunnel, poor welding can be made less likely to occur.

Further, the sheet guide portion 87 of the self-propelled face-to-face welding machine 80 in this embodiment is provided with height adjusting portions 874 and 875 . Here, the symbol LS shown in FIG. 5 and the like denotes a “sheet end surface line” indicating the design position of the end surface 5c (see FIG. 7) on the inner tunnel side located on the inner tunnel side of the pair of waterproof sheets 5. is. Here, in the pair of waterproof sheets 5 before being received in the sheet guide portion 87 of the self-propelled face-to-face welding machine 80, the tunnel inner hollow side end surface 5c of one or both of the waterproof sheets 5 is deviated from the sheet end surface line LS. As a result, the positions of the end faces 5c on the inner side of the tunnel at the ends of the pair of waterproof sheets 5 may be largely misaligned. In such a case, if the ends of the pair of waterproof sheets 5 are accidentally welded together, the ends of the waterproof sheets 5 will remain out of alignment with the end surfaces 5c on the inner tunnel side of the ends of the pair of waterproof sheets 5. It can be a factor that they are welded together.

On the other hand, in the present embodiment, height adjusting portions 874 and 875 are installed in the sheet guide portion 87, and the ends of the waterproof sheets 5 received in the guide space 873 are adjusted by the height adjusting portions 874 and 875. , the height of the end face 5c on the inner side of the tunnel is made uniform. Specifically, in the process of guiding the ends of the pair of waterproof sheets 5 received from the receiving openings 873 a of the sheet guide portion 87 to the welding portion 85 , the heights of the height adjusting portions 874 and 875 are flat and equal to each other. By bringing the inner tunnel end face 5c of each waterproof sheet 5 into contact (sliding contact) with each of the guide surfaces UF arranged at the same height, the heights of the inner tunnel inner end faces 5c of the pair of waterproof sheets 5 are aligned. In this state, they can be welded together at the welding portion 85 .

As described above, after automatically welding the ends of the pair of waterproof sheets 5 along the tunnel circumferential direction while allowing the self-propelled face-to-face welding machine 80 to travel along the welding machine guide rail 60, The ends of the pair of waterproof sheets 5 whose inner surfaces 5b are welded together by face-to-face welding are folded back to form a pair of waterproof sheets using, for example, a hot-air welding machine as described in FIG. 1(f). After the end of the waterproof sheet 5 is welded to the outer surface 5a of the existing waterproof sheet 5 in the existing sheet area, the filler 6 may be filled in the new sheet area. As a result, even in the new sheet area, the gap between the new waterproof sheet 5 and the shotcrete 3 is filled with the filler 6 and solidified, eliminating the gap on the back surface of the newly installed waterproof sheet 5 and The surface of can be extended in a smooth state without unevenness. The folding back of the ends of the pair of waterproof sheets 5 and the welding of the folded parts to the existing waterproof sheet 5 after face-to-face welding may be performed after filling the filler 6 in the new sheet area.

Although the self-propelled face-to-face welding machine 80 in Embodiment 1 includes the sheet guide portion 87 and the height adjustment portions 874 and 875, it is not always necessary to install them. It is possible to weld the ends of the waterproof sheet 5 automatically and suitably.

<Embodiment 2>
Next, Embodiment 2 will be described. FIG. 12 is an overall front view of an automatic welding device 40 according to Embodiment 2. FIG. The automatic welding device 40 according to the second embodiment is designed to prevent the self-propelled face-to-face welding machine 80 from slipping off the welding machine guide rail 60 while allowing it to travel along the welding machine guide rail 60. A balancer device 70 is provided as a suspension device for suspending the self-propelled face-to-face welding machine 80 . An automatic welding device 40 according to Embodiment 2 is the same as that of Embodiment 1 except that a balancer device 70 is additionally provided. Details of the balancer device 70 will be described below.

13 to 15 are diagrams for explaining the balancer device 70 according to the second embodiment. The balancer device 70 is attached to the traveling base 32 . The balancer device 70 has, for example, a substantially rectangular parallelepiped main body case 71 made of a metal flat plate. FIG. 13 is a diagram showing an installation mode of the main body case 71 in the balancer device 70 according to the second embodiment. In the example shown in FIG. 13, the main body case 71 is attached to a support frame 91 erected from the travel base 32 by an appropriate method such as welding or bolting. As shown in FIG. 12, the balancer device 70 (body case 71) is attached to the support frame 91 of the travel base 32 so as to be positioned above the top portion 60c of the welding machine guide rail 60. As shown in FIG. In the example shown in FIG. 12, the balancer device 70 (main body case 71) is arranged at a position passing through the center CL in the inner hollow section of the tunnel 2 (a position passing through the top portion 60c of the welding machine guide rail 60). Further, the main body case 71 of the balancer device 70 is formed with an open end on the lower side, so that an opening 71a for extending the wire rope from the main body case 71 is formed.

FIG. 14 is a diagram illustrating the detailed structure of the balancer device 70 according to the second embodiment. Inside the main body case 71 of the balancer device 70, a wire rope 72 for suspending the self-propelled face-to-face welding machine 80, a rotating drum 73 for winding the wire rope 72, and a torque for rotating the rotating drum 73 are provided. A spiral spring 75 or the like is accommodated as a torque imparting portion that generates torque. The wire rope 72 extends downward and outward of the body case 71 through an opening 71a provided in the lower portion of the body case 71, passes through a through hole formed in the contact portion 74a of the limit switch 74, and further downwards. extended. A connecting ring 72 a is formed at the tip of the wire rope 72 . As shown in FIGS. 6, 12, etc., a mounting hole 83c is formed in the center upper part of the frame body portion 83 of the welding machine frame 82 of the self-propelled face-to-face welding machine 80, and the wire rope 72 The tip of the wire rope 72 can be connected to the welding machine base 82 by connecting the connecting ring 72a formed at the tip of the wire rope 72 to the mounting hole 83c of the welding machine base 82 using an appropriate connecting fitting. A buffer rubber 72b is attached to the wire rope 72 in the vicinity of the connecting ring 72a. It is designed not to be wound up by 73.

FIG. 15 is a schematic configuration diagram of the rotating drum 73 in the balancer device 70 according to the second embodiment as viewed from the side. A reference numeral 73 c denotes a rotation shaft of the rotating drum 73 . The rotating drum 73 has a tapered outer peripheral surface 73a whose diameter increases from the front side to the rear side of the main body case 71. The outer peripheral surface has a groove portion 73b that is recessed radially inward. It is spirally formed. An end of a wire rope 72 is fixed to a groove portion 73b on the large diameter side of the rotary drum 73, and the wire rope 72 is wound along the groove portion 73b toward the small diameter side.

Due to the configuration of the tapered outer peripheral surface 73a of the rotating drum 73 and the wire rope 72 spirally wound from the large diameter side to the small diameter side, the wire rope 72 can be suspended by the wire rope 72 regardless of the unwinding amount of the wire rope 72. The weight of the suspended self-propelled face-to-face welding machine 80 and the tension of the wire rope 72 by the spiral spring 75 can be balanced. That is, as the wire rope 72 is pulled out, the spiral spring 75 is elastically deformed, the number of turns increases, and the torque applied to the rotary drum 73 by the spiral spring 75 increases. As a result, the reaction force received from the wire rope 72 is gradually applied to the large diameter side of the rotating drum 73 , and a gradually increasing torque is applied to the rotating drum 73 . The opposite is true when the wire rope 72 is wound. In this way, the change in the torque applied to the rotary drum 73 by the spiral spring 75 is offset by changing the position (distance from the rotation center axis of the rotary drum 73) where the reaction force from the wire rope 72 is applied, and the wire rope A substantially constant tension is generated regardless of the amount of unwinding of 72 .

FIG. 12 shows the self-propelled face-to-face welder 80 traveling in an uphill section R1, which is the section from the first end 60a to the top 60c of the guide rail 60 for welding machine. 80 is suspended by the balancer device 70. FIG. FIG. 16 shows the self-propelled face-to-face welding machine 80 according to the second embodiment traveling in the downward slope section R2, which is the section from the top portion 60c to the second end portion 60b of the guide rail 60 for welding machines. It shows a state in which the wielding welding machine 80 is suspended by the balancer device 70 . Since the automatic welding device 40 in this embodiment is provided with the balancer device 70, when automatically welding the ends of the pair of waterproof sheets 5, self-propelled face-to-face welding is performed by self-propelled along the guide rails 60 for the welding machine. It is possible to prevent the machine 80 from sliding down from the welding machine guide rail 60 . Note that the balancer device 70 may apply rotational torque to the rotating drum 73 by a motor instead of the spiral spring 75 as a torque applying unit that applies torque in the winding direction of the wire rope 72 to the rotating drum 73 . . The magnitude of the torque imparted to the rotating drum 73 by the torque imparting portion constituted by the spiral spring 75 and the motor can be set to an appropriate magnitude. Further, the rotational torque applied to the rotating drum 73 by the torque applying unit differs between when the self-propelled face-to-face welding machine 80 travels in the uphill section R1 and in the downhill section R2 on the welding machine guide rail 60. You can set the size. In the example shown in FIG. 12, the position of the balancer device 70 passing through the center CL in the inner section of the tunnel 2 is arranged at a position corresponding to the vicinity of the top end in the inner section of the tunnel 2. You can change the placement position. For example, the balancer device 70 may be arranged in the vicinity of the shoulder portion of the inner hollow section of the tunnel 2 .

<Embodiment 3>
Next, Embodiment 3 will be described. FIG. 17 is an overall front view of an automatic welding device 40 according to Embodiment 3. FIG. As shown in FIG. 17, the automatic welding device 40 according to the third embodiment further includes a travel power transmission rail 65. As shown in FIG. The traveling power transmission rail 65 is positioned by being supported by the support frame 91, like the welding machine guide rail 60. As shown in FIG.

The traveling power transmission rail 65 is an arch-shaped rail member having a similar shape (approximate shape) to the inner wall surface S<b>1 of the tunnel 2 and extends along the circumferential direction of the tunnel 2 . Further, the traveling power transmission rail 65 has a shape similar to that of the welding machine guide rail 60 and has an arch shape relatively smaller than that of the welding machine guide rail 60 .

FIG. 18 is a right side view of the self-propelled face-to-face welding machine 80A according to the third embodiment. Hereinafter, the differences between the self-propelled face-to-face welding machine 80A according to the third embodiment and the self-propelled face-to-face welding machine 80 of the first embodiment will be mainly described.

Next, the traveling power transmission section 86 of the self-propelled face-to-face welding machine 80 will be described. The traveling power transmission unit 86 transmits the rotational driving force of the drive motor 88 in the self-propelled face-to-face welding machine 80A (welding machine main body 81) to the traveling power transmission rail 65 fixed to the traveling base 32. The self-propelled face-to-face welding machine 80A is caused to travel along the welding machine guide rail 60. - 特許庁Furthermore, in the present embodiment, the running power transmission unit 86 transmits the running power by synchronizing the rotational driving force generated by the drive motor 88 with the rotation of the pair of rotating shafts for welding 851A and 851B (pair of rotating shafts for welding). It is configured to be transmitted to the control rail 65 . Details of the traveling power transmission unit 86 will be described below.

The running power transmission portion 86 includes a pair of running power transmitting rotary shafts 861A and 861B (running power (rotary shaft pair for transmission) and the pair of rotating shafts 861A and 861B for transmitting driving power (rotary shaft pair for transmitting driving power), and clamps the rail 65 for transmitting driving power. It has a pair of rotating rollers 862A and 862B for transmitting driving power (pair of rollers for transmitting driving power) and a driving power transmission mechanism. The traveling power transmission mechanism transmits the rotational force of at least one of the first welding rotating shaft 851A and the second welding rotating shaft 851B to the pair of traveling power transmitting rotating shafts 861A and 861B, thereby transmitting the driving power to the pair of traveling power transmission rotating shafts 861A and 861B. It is a mechanism for rotating the rotary transmission shafts 861A and 861B in mutually opposite directions, and can be configured by combining mechanical parts such as shafts and gears.

The traveling power transmission portion 86 has a casing including a first cylindrical sleeve 860A, a second cylindrical sleeve 860B, and a third cylindrical sleeve 860C for accommodating shafts and gears included in the traveling power transmission portion 86. Here, the first cylindrical sleeve 860A and the second cylindrical sleeve 860B are arranged parallel to the cylindrical sleeves 850A and 850B. Further, as shown in FIG. 18, the third cylindrical sleeve 860C is connected to a rear side portion of the cylindrical sleeve 850B and to the lower ends of the first cylindrical sleeve 860A and the second cylindrical sleeve 860B. As shown in FIG. 18, a cylindrical sleeve 850A, a cylindrical sleeve 850B, a first cylindrical sleeve 860A, and a second cylindrical sleeve 860B are arranged in this order from the front surface 810a side of the welder main body 81 toward the rear surface 810b side. are placed. In the present embodiment, the pair of welding rollers 852A and 852B and the pair of running power transmission rotary rollers 862A and 862B are set so that the alignment direction of their central axes is parallel to the tunnel axis direction.

As shown in FIG. 18, the first cylindrical sleeve 860A in the traveling power transmission portion 86 accommodates the rotary shaft 861A for traveling power transmission, and the second cylindrical sleeve 860B accommodates the rotary shaft 861B for traveling power transmission. , and the intermediate shaft 863 is accommodated in the third cylindrical sleeve 860C. In the following description, of the pair of rotating shafts 861A and 861B for transmitting driving power, the rotating shaft 861A for transmitting driving power, which is arranged relatively on the front side of the welding machine main body 81, will be referred to as the "first rotating shaft for transmitting driving power 861A." , and the traveling power transmission rotary shaft 861B disposed relatively on the rear side is called a "second traveling power transmission rotary shaft 861B." Among the pair of traveling power transmission rotating rollers 862A and 862B, the traveling power transmitting rotating roller 862A arranged relatively on the front side of the welding machine main body 81 is referred to as the "first traveling power transmitting rotating roller 862A". , and the traveling power transmission rotary roller 862B disposed relatively on the rear side is called a "second traveling power transmission rotary roller 862B". In addition, the intermediate shaft 863 is perpendicular to the rotary shafts 851A and 851B for welding and the rotary shafts 861A and 861B for traveling power transmission and extends along the tunnel axial direction. are placed in

Here, the third gear G3 is attached to one end region of the intermediate shaft 863 that is adjacent to the second welding rotation shaft 851B, and the intermediate region that is adjacent to the end of the first traveling power transmission rotation shaft 861A. A fourth gear G4 is attached to the second driving power transmission rotary shaft 861B, and a fifth gear G5 is attached to the other end region adjacent to the end of the second running power transmission rotary shaft 861B. A sixth gear G6 that meshes with the third gear G3 of the intermediate shaft 863 is attached to the second welding rotating shaft 851B. A seventh gear G7 and an eighth gear G8 meshing with the fourth gear G4 and the fifth gear G5 of the intermediate shaft 863 are provided on the first traveling power transmission rotary shaft 861A and the second traveling power transmission rotary shaft 861B, respectively. installed.

In the traveling power transmission section 86 configured as described above, the rotational force of the second welding rotary shaft 851B rotationally driven by the drive motor 88 is transferred to the intermediate gear through the meshing of the sixth gear G6 and the third gear G3. As a result of the transmission to the shaft 863, the intermediate shaft 863 is rotationally driven. As a result of the rotational force of the intermediate shaft 863 being transmitted to the first traveling power transmission rotary shaft 861A through the engagement of the fourth gear G4 and the seventh gear G7, the first traveling power transmission rotary shaft 861A is rotationally driven. Similarly, the rotational force of the intermediate shaft 863 is transmitted to the second traveling power transmission rotary shaft 861B through the engagement of the fifth gear G5 and the eighth gear G8, resulting in the second traveling power transmission rotary shaft 861B. is rotationally driven. Here, the running power transmission unit 86 transmits the rotational force of the second welding rotating shaft 851B so that the first running power transmitting rotating shaft 861A and the second running power transmitting rotating shaft 861B rotate in opposite directions. It is transmitted to the rotating shafts 861A and 861B for driving power transmission. More specifically, the direction in which the first traveling power transmission rotary shaft 861A rotates is made to coincide with the rotation direction D1 (see FIG. 8) of the first welding rotary shaft 851A, and the second traveling power transmission rotary shaft 861B rotates. The direction of rotation is matched with the direction of rotation D2 (see FIG. 8) of the second welding rotation shaft 851B. Further, in this embodiment, the welding rollers 852A and 852B and the traveling power transmission rotary rollers 862A and 862B are designed to rotate at the same angular velocity. Moreover, each of the rotating rollers 862A and 862B for driving power transmission may be made of rubber.

As shown in FIG. 19, the self-propelled face-to-face welding machine 80A configured as described above has a travel power transmission rail between the first travel power transmission rotary roller 862A and the second travel power transmission rotary roller 862B. 65 is pinched, and the ends of the waterproof sheet 5 hanging down from the tunnel inner wall surface S1 are overlapped between the first welding roller 852A and the second welding roller 852B. As shown in FIG. 19, the running power transmission rail 65 is supported by the support frame 91 via a rail support member 94 horizontally extending from the support frame 91 . 19, for the sake of convenience, the illustration of the pair of waterproof sheets 5 to be welded is omitted.

According to the automatic welding device 40 of this embodiment, since the self-propelled face-to-face welding machine 80A is provided with the traveling power transmission section 86, the rotational driving force of the drive motor 88 is transmitted via the traveling power transmission section 86 to the traveling power. By transmitting to the transmission rail 65, the self-propelled face-to-face welding machine 80A
can suitably travel along the welding machine guide rail 60 . That is, while the running power transmission rail 65 is pressed between the first running power transmission rotary roller 862A and the second running power transmission rotary roller 862B, the first running power transmission rotary roller 862A is used for the first welding. By rotating in the same direction as the roller 852A and rotating the second traveling power transmission rotating roller 862B in the same direction as the second welding roller 852B, the self-propelled face-to-face welding machine is driven along the welding machine guide rail 60. Power for self-propelled 80A can be suitably obtained. However, as described in the first embodiment, the self-propelled face-to-face welding machine 80 is configured such that the pair of welding rollers 852A and 852B sandwich the ends of the pair of waterproof sheets 5 between the pair of welding rollers 852A and 852B. The driving force generated when rotating 852A and 852B in the opposite direction can be used to obtain a driving force for propelling the self-propelled face-to-face welding machine 80 along the welding machine guide rail 60. The self-propelled face-to-face welding machine 80 can be self-propelled along the welding machine guide rail 60 even if the traveling power transmission part 86 is not provided as in the present embodiment. The automatic welding device 40 according to the present embodiment is additionally provided with a traveling power transmission section 86, so that the power for self-propelled self-propelled face-to-face welding machine 80 along the welding machine guide rail 60 is You can get more and more.

Furthermore, according to the automatic welding device 40 of the present embodiment, since the traveling power transmission rail 65 has a shape similar to that of the welding machine guide rail 60 , the self-propelled welding device 40 is self-propelled along the welding machine guide rail 60 . It is preferable that the clamping state of the running power transmission rail 65 by the first running power transmission rotary roller 862A and the second running power transmission rotary roller 862B is released while the joint welding machine 80A is running. can be suppressed to

Further, the running power transmission unit 86 in this embodiment synchronizes the rotation driving force generated by the drive motor 88 with the rotation of the pair of rotating shafts 851A and 851B for welding (pair of rotating shafts for welding) to transmit the running power. Since the structure of transmitting to the rail 65 is adopted, the speed at which the ends of the waterproof sheet 5 are welded while being pressed together by the first welding roller 852A and the second welding roller 852B and the speed along the guide rail 60 for the welding machine. The speed at which the self-propelled face-to-face welding machine 80 travels can be accurately adjusted. As a result, it is possible to suitably suppress the occurrence of distortion at the welded portions of the ends of the waterproof sheet 5 .

In each of the above-described embodiments, the case where the automatic welding device 40 is applied to the welding of the ends of the waterproof sheet 5 in the smooth-back tunnel lining construction method has been described as an example, but the object of application is the smooth-back type. It is not limited to the tunnel lining method. In the tunnel water stop construction, when the ends of the waterproof sheet laid on the inner surface of the tunnel pit or the inner surface of the shotcrete of the primary lining provided on the inner surface of the tunnel pit are welded together, An automatic welding device 40 may be used.

FIG. 20 is a diagram for explaining how the waterproof sheet 5 is laid on the inner surface of the shotcrete 3 as the primary lining provided in the inner surface of the tunnel. The waterproof sheet 5 is a laminated waterproof sheet in which a non-woven fabric layer 51 as an inner layer cushioning material and an outer waterproof sheet layer 52 are laminated. The waterproof sheet 5 has an appropriate width dimension, for example, a width of about 2 m. 52 are glued. As shown in FIG. 20 , when laying the waterproof sheets 5 , tacks 500 are driven while the nonwoven fabric layers 51 of each waterproof sheet 5 are overlapped by a predetermined width in the width direction. The riveting of the rivet 500 can be performed using, for example, a commercially available riveting machine. Then, the ends of the pair of waterproof sheets 5 hanging down from the shotcrete 3 (inner wall surface of the tunnel) surrounded by the dashed circle shown in FIG. The mating welding may be performed automatically.

However, the tunnel waterproofing construction method described in FIG. 20 is not a tunnel lining method with a smooth back surface, but a sheet waterproofing method in which a waterproof sheet 5 is laid directly on the surface of the shotcrete 3. Of course, the specifications of the sheet spreading device 30 can be changed as appropriate. For example, when the construction method shown in FIG. 20 is applied, the traveling base 32 of the waterproof sheet stretching device 30 does not need to support the waterproof sheet 5 by using the sheet mount 11 . Therefore, instead of installing the seat frame 11, the traveling base 32 may be, for example, a portal frame with a stepped work stage attached thereto. That is, if the traveling base 32 is equipped with an automatic welding device 40 having a welding machine guide rail 60 and a self-propelled face-to-face welding machine 80 that can self-travel along the welding machine guide rail 60, good. Then, the automatic welding device 40 installed on the traveling base 32 of the waterproof sheet spreading device 30 is set on the joint portion of the waterproof sheet 5, and the automatic welding device 40 is self-propelled along the welding machine guide rail 60 as in the above-described embodiments. The end portions of the pair of waterproof sheets 5 can be automatically welded together while the joint-type welder 80 is self-propelled.

Although the embodiments of the present invention have been described above, the automatic tunnel waterproof sheet welding apparatus according to the present invention is not limited to these, and these can be combined as much as possible.

2 Tunnel 5 Waterproof sheet 6 Filler 11 Sheet stand 30 Waterproof sheet spreading device 32 Travel base 40 Automatic welding device 60 Welding Machine guide rail 80 Self-propelled face-to-face welding machine 81 Main body of welding machine 82 Base for welding machine

Claims (4)

a guide rail for the welding machine fixed to a traveling base capable of traveling along a rail laid along the axial direction of the tunnel and extending in an arch shape along the circumferential direction of the tunnel;
a self-propelled face-to-face welding machine provided on the welding machine guide rail and capable of traveling along the welding machine guide rail;
with
The self-propelled face-to-face welding machine is
A pair of rotating shafts for welding having rotating shafts parallel to each other, a heater for heating the ends of a pair of waterproof sheets to be welded, and a pair of rotating shafts for welding coaxially fixed to each of the pair of welding shafts. a welded portion including a pair of rollers;
a rotational drive source that rotationally drives the pair of rotating shafts for welding in opposite directions;
has
The pair of welding rollers are configured to rotate in opposite directions at equal angular velocities by the rotational drive source,
In the self-propelled face-to-face welding machine, the ends of the waterproof sheet heated by the heater are overlapped with each other, and the ends of the waterproof sheet are welded together by the pair of welding rollers rotated in opposite directions. By traveling in one direction along the guide rail for the welding machine while pressing the waterproof sheet, the ends of the waterproof sheet are automatically welded along the tunnel circumferential direction , and the welding roller pair moves the waterproof sheet self-propelled along the guide rail for the welding machine by utilizing the rotational force rotating in the opposite direction while pressing the ends together;
Automatic welding equipment for tunnel waterproof sheets. The self-propelled face-to-face welding machine has a sheet guide part that is provided on the front side of the welding part in the welding direction and guides the ends of the pair of waterproof sheets toward the welding part,
The sheet guide portion receives the ends of the pair of waterproof sheets and has a pair of guide plates for guiding the outer surfaces of the received ends of the pair of waterproof sheets, and between the pair of guide plates. The width of the formed guide space is narrowed toward the welded portion.
The automatic welding apparatus for tunnel waterproof sheets according to claim 1 . The self-propelled face-to-face welder is suspended in order to prevent the self-propelled face-to-face welder from slipping off the guide rail for the welder while allowing it to travel along the guide rail for the welder. Further comprising a suspension device,
The automatic welding apparatus for tunnel waterproof sheets according to claim 1 or 2 . The suspension device is a balancer device attached to the traveling base,
The balancer device is
a rotating drum having a tapered outer peripheral surface;
a wire rope wound from the large diameter side to the small diameter side of the rotary drum;
a torque applying unit that applies torque to the rotating drum in a direction in which the wire rope is wound;
having
The automatic welding apparatus for tunnel waterproof sheets according to claim 3 .

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