Pipe laying method and pipe laying apparatus

Abstract

The pipes are laid by being pushed out without compensating for the pipe's rigidity. [Solution] A pipe laying method for laying pipes 22 on a bridge 100, comprising: a rail installation step of attaching rails 12 to the bridge 100; a movable part installation step of attaching a movable part 13 that moves along the rails 12 to the rails 12; a pipe suspension step of suspending pipes 22 from the movable part 13 attached to the rails 12; a pipe feeding step of feeding out the pipes 22 suspended in the pipe suspension step along the rails 12; and a pipe connecting step of connecting a subsequent pipe to the pipes 22 fed out in the pipe feeding step, wherein in the pipe suspension step, at least the tip of the pipe is suspended from the movable part.

Description

Technical Field

[0006] , ,

[0001] [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​However, in both of the prior art documents disclosed in Patent Documents 1 and 2, the force applied to the pipe during pipe feeding is only a horizontal force, raising concerns about the tip of the pipe sagging. In the prior art document disclosed in Patent Document 1, a member is added to compensate for the rigidity of the pipe, and in the prior art document disclosed in Patent Document 2, it is considered that there may be cases where it is necessary to compensate for the rigidity of the pipe before feeding it out.

[0007] The present invention has been made in view of the above, and aims to provide a pipe laying method and a pipe laying device that can feed out pipes without compensating for the rigidity of the pipes.

[0008] In this application, the expression "feeding out the pipe" includes both cases where the pipe is pulled forward and cases where the pipe is pushed forward. [Means for solving the problem]

[0009] The present invention solves the aforementioned problems and is a pipe laying method and pipe laying apparatus as described below.

[0010] That is, the first aspect of the pipe laying method according to the present invention is a pipe laying method for laying pipes on a bridge, comprising: a rail installation step of attaching rails to the bridge; a movable part installation step of attaching a movable part that moves along the rails to the rails; a pipe suspension step of suspending pipes from the movable part attached to the rails; a pipe feed-out step of feeding out the pipe suspended in the pipe suspension step along the rails; and a pipe connecting step of connecting a subsequent pipe to the pipe fed out in the pipe feed-out step, wherein in the pipe suspension step, at least the tip of the pipe is suspended from the movable part.

[0011] Here, "attaching rails to the bridge" includes not only cases where rails are attached so as to be in direct contact with the bridge, but also cases where rails are attached to the bridge via other components. In other parts of this application, unless otherwise specified, descriptions such as "attach" or "attach" include not only cases where rails are attached so as to be in direct contact, but also cases where rails are attached via other components.

[0012] Furthermore, the "pipe" suspended in the pipe suspension process and the "subsequent pipe" in the pipe connection process include not only a single pipe but also a connecting pipe formed by pre-connecting multiple pipes.

[0013] A second embodiment of the pipe laying method according to the present invention is a pipe laying method according to the first embodiment, wherein the mobile unit to be attached in the mobile unit attachment step is a self-propelled mobile unit having a self-propelled function, and in the pipe feeding step, the pipe is fed along the rail by making the self-propelled mobile unit move along the rail.

[0014] Here, "the moving part at the leading edge in the direction of travel" refers to the single moving part used when only one such moving part is available. Similar descriptions in other parts of this application shall be interpreted in the same way.

[0015] A third aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, wherein the movable part to be attached in the movable part attachment step is a driven movable part, and in the pipe feeding step, the pipe is fed along the rail by pushing the pipe along the rail.

[0016] A fourth aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, wherein the bridge has a straight shape when viewed from above, the movable part to be attached in the movable part attachment step is a driven movable part, a wire rope is attached to the leading movable part in the direction of travel of the driven movable part, and in the pipe feeding step, the pipe is fed along the rail by pulling the wire rope along the rail.

[0017] A fifth aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, characterized in that, in the movable part attachment step, a plurality of movable parts are attached to the rail, all of the plurality of movable parts are driven movable parts, of which the leading movable part located on the front side in the direction of travel does not suspend the pipe, the trailing movable part located on the rear side in the direction of travel suspends the pipe, a wire rope is attached to the trailing movable part at the front of the trailing movable parts in the direction of travel, a guide mechanism is attached to the leading movable part which is connected to the wire rope and guides the wire rope along the rail, and in the pipe feeding step, the pipe is fed along the rail by pulling the wire rope along the rail.

[0018] Here, "the leading rearward moving part in the direction of travel" refers to the single rearward moving part used when only one is available. Similar descriptions in other parts of this application shall be interpreted in the same way.

[0019] A sixth aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, wherein in the movable part attachment step, a plurality of the movable parts are attached to the rail, and of the plurality of movable parts, the leading movable part in the direction of travel is a self-propelled movable part having a self-propelled function, and the other movable parts are driven movable parts, and in the pipe feeding step, each time a subsequent pipe is connected to the pipe in the pipe connection step and the subsequent pipe is suspended from the driven movable part, the self-propelled movable part is made to move along the rail, thereby feeding the pipe along the rail.

[0020] A seventh aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, characterized in that, in the movable part attachment step, a plurality of movable parts are attached to the rail, and all of the plurality of movable parts are driven movable parts, and in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the movable part, the pipe is pushed along the rail, thereby feeding the pipe along the rail.

[0021] An eighth aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, wherein the bridge has a straight shape when viewed from above, in the movable part attachment step, a plurality of movable parts are attached to the rail, all of the plurality of movable parts are driven movable parts, a wire rope is attached to the movable part at the front of the plurality of movable parts in the direction of travel, and in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the movable part, the wire rope is pulled along the rail to feed the pipe along the rail.

[0022] A ninth aspect of the pipe laying method according to the present invention is the pipe laying method according to the first aspect, characterized in that, in the movable part attachment step, a plurality of movable parts are attached to the rail, all of the plurality of movable parts are driven movable parts, of which the leading movable part located on the front side in the direction of travel does not suspend the pipe, the trailing movable part located on the rear side in the direction of travel suspends the pipe, a wire rope is attached to the trailing movable part which is the leading part in the direction of travel, a guide mechanism is attached to the leading movable part which is connected to the wire rope and guides the wire rope along the rail, and in the pipe feeding step, each time a subsequent pipe is connected to the pipe in the pipe connection step and the subsequent pipe is suspended from the trailing movable part, the wire rope is pulled along the rail to feed the pipe along the rail.

[0023] The tenth aspect of the pipe laying method according to the present invention is an aspect characterized in that, in the pipe laying method of any one of the first to ninth aspects, a pipe is laid along the bridge.

[0024] Here, "along the bridge" means along the outer surface of the bridge (the surface of the portion facing the outer direction), and regardless of the direction along which, it includes not only the case of being along the extending direction of the bridge (the bridge axis direction), but also the case of being along the width direction of the bridge, etc.

[0025] The eleventh aspect of the pipe laying method according to the present invention is an aspect characterized by having a scaffolding installation step of providing a scaffolding below the bridge, which is used when connecting pipes to each other in the pipe connection step and when feeding out pipes in the pipe feeding step in the pipe laying method of any one of the first to tenth aspects.

[0026] The twelfth aspect of the pipe laying method according to the present invention is an aspect characterized in that, in the pipe laying method of any one of the first to eleventh aspects, in the pipe connection step, both of the pipes to be connected are straight pipes, and they are connected so that the angle formed by the straight pipes becomes a predetermined angle so as to correspond to the target laying position.

[0027] The thirteenth aspect of the pipe laying method according to the present invention is an aspect characterized in that, in the pipe laying method of any one of the second, third, fifth, sixth, seventh, and ninth aspects, the bridge has a planar curve portion that is curved when viewed from above, and the pipe laid on the planar curve portion is connected to an adjacent pipe by adjusting the angle formed with the adjacent pipe in the pipe connection step so as to correspond to the planar curve portion.

[0028] The fourteenth aspect of the pipe laying method according to the present invention is an aspect characterized in that, in the pipe laying method of any one of the first to thirteenth aspects, in the pipe connection step, the pipes are connected to each other by welding.

[0029] A fifteenth aspect of the pipe laying method according to the present invention is a pipe laying method according to any of the first to fourteenth aspects, wherein after the pipe is fed out to a target position in the pipe feeding step, the pipe is lowered to a predetermined height position in a pipe lowering step, and in the rail installation step, the rail is installed on the bridge at a position above the position where the pipe is laid.

[0030] A sixteenth aspect of the pipe laying method according to the present invention is a pipe laying method according to any of the first to fifteen aspects, characterized in that the rail to be attached to the bridge in the rail attachment step is attached to the bridge via a support member.

[0031] A 17th aspect of the pipe laying method according to the present invention is the pipe laying method according to the 16th aspect, characterized in that the support member is attached to the outer surface of the curb of the bridge.

[0032] An eighteenth aspect of the pipe laying method according to the present invention is a pipe laying method according to the sixteenth or seventeenth aspect, wherein the support member comprises two horizontal members extending horizontally with a predetermined distance difference in height, the rail to be attached to the bridge in the rail attachment step is attached to the horizontal member with the higher height among the two horizontal members, and the pipe is lowered from the horizontal member with the lower height among the two horizontal members in the pipe lowering step.

[0033] Here, "suspending the pipe from the horizontal member at the lower height position" includes not only cases where the pipe is suspended so as to be in direct contact with the "horizontal member at the lower height position," but also cases where the pipe is suspended from another member positioned above the "horizontal member at the lower height position."

[0034] A 19th aspect of the pipe laying method according to the present invention is a pipe laying method according to any of the first to 15 aspects described above, characterized in that the rail to be attached to the bridge in the rail attachment step is attached to the girder member of the bridge along the longitudinal direction of the girder member.

[0035] A 20th aspect of the pipe laying method according to the present invention is a pipe laying method according to any of the first to 19 aspects, characterized in that when attaching rails to the bridge in the rail attachment step, at least one of a bridge inspection vehicle and an aerial work platform is used.

[0036] In this application, "bridge inspection vehicle" means a work vehicle equipped with an arm member that can extend, retract, and rotate, and which has a work platform at the tip of the arm member that serves as a work platform, and which, when positioned on the superstructure of a bridge, can provide a work platform that enables work on the underside and sideside of the superstructure of the bridge.

[0037] A first embodiment of the pipe laying device according to the present invention is a pipe laying device for laying pipes on a bridge, comprising: a rail; a first support part attached to the bridge and supporting the rail from above; a movable part attached to the rail and moving along the rail; a suspension part attached to the movable part and suspending the pipe; and a second support part attached to the bridge at a position lower than the position of the rail supported by the first support part, on which the pipe is placed, wherein the movable part moves along the rail while suspending the pipe.

[0038] Here, "attached to the bridge" means not only when the first support is attached to the bridge in direct contact, but also when the first support is attached to the bridge via other members. In other parts of this application, unless otherwise specified, descriptions such as "attached" or "attached" also mean not only when attached in direct contact, but also when attached via other members.

[0039] Furthermore, the phrase "supporting the rail from above" by the first support portion includes not only cases where the first support portion directly contacts the rail and supports it from above, but also cases where the first support portion supports the rail from above via other members. In other parts of this application, unless otherwise specified, "support" includes not only cases where the rail is supported in direct contact, but also cases where it is supported via other members.

[0040] A second embodiment of the pipe laying device according to the present invention is the pipe laying device according to the first embodiment, characterized in that the first support portion is detachably attached to the bridge.

[0041] A third aspect of the pipe laying device according to the present invention is a pipe laying device according to the first aspect, wherein it has a third support portion that is attached to the bridge and supports the second support portion, and the first support portion is detachably attached to the third support portion.

[0042] A fourth aspect of the pipe laying device according to the present invention is the pipe laying device according to the third aspect, characterized in that the third support portion is attached to the outer surface of the curb portion of the bridge.

[0043] A fifth aspect of the pipe laying device according to the present invention is a pipe laying device for laying pipes on a bridge, comprising: a girder member of the bridge; a rail attached to the girder member; a movable part attached to the rail and moving along the rail; and a suspension part attached to the movable part and suspending the pipe, wherein the movable part moves along the rail while suspending the pipe.

[0044] A sixth aspect of the pipe laying device according to the present invention is a pipe laying device according to any of the first to fifth aspects, characterized in that the suspension part can raise and lower the suspended pipe. [Effects of the Invention]

[0045] According to the present invention, it is possible to provide a pipe laying method and a pipe laying apparatus that can feed out pipes without compensating for the rigidity of the pipes. [Brief explanation of the drawing]

[0046] [Figure 1] Front view of pipe laying device 10 according to the first embodiment of the present invention [Figure 2] Enlarged front view showing the main parts of the pipe laying device 10 according to the first embodiment of the present invention. [Figure 3] Enlarged side view showing the main parts of the pipe laying device 10 according to the first embodiment of the present invention. [Figure 4] Front view showing the state after pipe laying has been completed using the pipe laying device 10 according to the first embodiment of the present invention. [Figure 5] A schematic plan view showing the state after the pipes 22 to be laid have been connected by welding. [Figure 6] A flowchart illustrating the procedure for a pipe laying method according to the first embodiment of the present invention. [Figure 7-1] A schematic front view showing the typical steps of the pipe laying method according to the first embodiment of the present invention and its modified versions (first modified version, second modified version). [Figure 7-2] A schematic front view showing the typical steps of the pipe laying method according to the first embodiment of the present invention and its modified versions (first modified version, second modified version). [Figure 8-1] A schematic side view showing a typical process of the pipe laying method according to the first embodiment of the present invention. [Figure 8-2] A schematic side view showing a typical process of the pipe laying method according to the first embodiment of the present invention. [Figure 8-3] A schematic side view showing a typical process of the pipe laying method according to the first embodiment of the present invention. [Figure 9] A flowchart showing the procedure for a first modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 10-1] A schematic side view showing a typical step of a first modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 10-2]A schematic side view showing a typical step of a first modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 10-3] A schematic side view showing a typical step of a first modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 11] A flowchart showing the procedure for a second modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 12-1] A schematic side view showing a typical step in a second modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 12-2] A schematic side view showing a typical step in a second modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 12-3] A schematic side view showing a typical step in a second modified example of the pipe laying method according to the first embodiment of the present invention. [Figure 13] Enlarged front view showing the wire guide mechanism 32 in detail. [Figure 14] Enlarged side view showing the wire guide mechanism 32 in detail. [Figure 15] This figure shows a first modified example of the support part in the first embodiment (upper horizontal part 52B, lower horizontal part 52A of the L-shaped bracket 52), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 16] This figure shows a second modified example of the support part in the first embodiment (upper horizontal part 54B, lower horizontal part 54A of the L-shaped bracket 54), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 17] This figure shows a third modified example of the support part in the first embodiment (upper horizontal part 56B, lower horizontal part 56A of the L-shaped bracket 56), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 18]This figure shows a fourth modified example of the support part in the first embodiment (upper horizontal part 58B, lower horizontal part 58A of the L-shaped bracket 58), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 19] This figure shows a fifth modified example of the support part in the first embodiment (the upper horizontal portion 60B and the lower horizontal portion 60A of the rectangular bracket 60), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 20] This figure shows a sixth modified example of the support part in the first embodiment (the upper horizontal portion 62B and the lower horizontal portion 62A of the rectangular bracket 62), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 21] This figure shows a seventh modified example of the support part in the first embodiment (upper horizontal portion 64B of the diagonal bracket 64, lower horizontal portion 66A of the L-shaped bracket 66), where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 22] Front view of pipe laying device 70 according to a second embodiment of the present invention [Figure 23] Enlarged front view showing the main parts of the pipe laying device 70 according to the second embodiment of the present invention. [Figure 24] Enlarged side view showing the main part of the pipe laying device 70 according to the second embodiment of the present invention. [Figure 25] Front view showing the state after pipe laying has been completed using the pipe laying device 70 according to the second embodiment of the present invention. [Figure 26] A flowchart illustrating the procedure for a pipe laying method according to a second embodiment of the present invention. [Figure 27] A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 28] A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 29]A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 30] A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 31] A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 32] A schematic front view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 33-1] A schematic side view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 33-2] A schematic side view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 33-3] A schematic side view showing a typical process of the pipe laying method according to the second embodiment of the present invention. [Figure 34] This figure shows a modified support part (L-shaped bracket 76) that can be used in the pipe laying method according to the second embodiment, where (A) is a front view showing the state in which the pipe 22 is being fed out, and (B) is a front view showing the state in which the laying of the pipe 22 is completed. [Figure 35] A schematic front view showing an example of conventional temporary scaffolding (temporary scaffolding 200). [Modes for carrying out the invention]

[0047] The pipe laying apparatus and pipe laying method according to embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that the pipes to be fed out in the pipe laying apparatus and pipe laying method according to embodiments of the present invention (each individual pipe before connection) are, in principle, straight pipes and are weldable steel pipes. However, the pipes to which the present invention can be applied are not limited to steel pipes, and the material of the pipes to which the present invention can be applied is not particularly limited. For example, the present invention can be applied to pipes made of synthetic resin or fiber-reinforced plastic. Furthermore, the present invention can also be applied to steel pipes coated with a synthetic resin such as polyethylene on their surface. In addition, the shape of the pipes to which the present invention can be applied is not particularly limited and is not limited to straight pipes.

[0048] (1) First Embodiment (1-1) Pipe laying device according to the first embodiment Figure 1 is a front view of the pipe laying device 10 according to the first embodiment of the present invention; Figure 2 is an enlarged front view showing an enlarged view of the main part of the pipe laying device 10 according to the first embodiment of the present invention; Figure 3 is an enlarged side view showing an enlarged view of the main part of the pipe laying device 10 according to the first embodiment of the present invention; Figure 4 is a front view showing the state after pipe laying has been completed using the pipe laying device 10 according to the first embodiment of the present invention; and Figure 5 is a schematic plan view showing the state after the pipes 22 to be laid have been connected by welding.

[0049] The pipe laying device 10 according to this first embodiment is a pipe laying device that lays pipes 22 below the curb portion 102 of the bridge 100, along the direction in which the bridge 100 extends. As shown in Figures 1 to 3, the pipe laying device 10 comprises a rail 12, a movable part 13, a suspension part 17 (lever block (registered trademark) 18 and sling belt 20), an L-shaped bracket 50 (lower horizontal part 50A, vertical part 50C), and an upper horizontal part 50B. Multiple L-shaped brackets 50 and upper horizontal parts 50B are installed at predetermined intervals in the direction in which the bridge 100 extends.

[0050] The L-shaped bracket 50 consists of a lower horizontal section 50A and a vertical section 50C. An upper horizontal section 50B is detachably attached to the vertical section 50C near its center, above the lower horizontal section 50A (for example, detachably attached by bolt connection). A rail 12 is attached to the underside of the upper horizontal section 50B attached to the vertical section 50C of the L-shaped bracket 50, and the pipe 22 to be laid is placed on the lower horizontal section 50A of the L-shaped bracket 50. Therefore, the upper horizontal section 50B serves as a support for the rail 12, and the lower horizontal section 50A of the L-shaped bracket 50 serves as a support for the pipe 22 to be laid. A mounting plate 50Z is welded to the upper end of the vertical section 50C of the L-shaped bracket 50, and the L-shaped bracket 50 can be attached to the bridge 100 by attaching the mounting plate 50Z to the side of the curb section 102 with anchor bolts (not shown). The L-shaped bracket 50 can be installed using a bridge inspection vehicle or aerial work platform, eliminating the need for temporary scaffolding. In Figures 1 and 4, reference numeral 104 indicates a railing installed on the curb section 102.

[0051] The rail 12 is attached to the underside of the upper horizontal section 50B, which is detachably attached to the vertical section 50C of the L-shaped bracket 50, and is installed along the direction in which the bridge 100 extends. The rail 12 can be attached to the upper horizontal section 50B using a bridge inspection vehicle or an aerial work platform, and temporary scaffolding is not required. A movable section 13 is attached to the rail 12, and the movable section 13 moves along the rail 12.

[0052] The movable part 13 is configured to move along the rail 12, and for example, a trolley can be used. A suspension part 17 is attached to the movable part 13, and the pipe 22 is suspended from the movable part 13 by the suspension part 17.

[0053] The suspension section 17 is responsible for suspending the pipe 22. Specifically, it consists of a lever block 18 and a sling belt 20. As shown in Figures 2 and 3, the upper hook 18B of the lever block 18 engages with the lower connecting part of the movable section 13, and the sling belt 20 engages with the lower hook 18A of the lever block 18. The sling belt 20 wraps around the pipe 22 in a circular direction, suspending the pipe 22. With the pipe 22 suspended from the movable section 13 in this manner, the pipe 22 is fed along the rail 12.

[0054] Since the pipe 22 is suspended from the movable part 13 (i.e., the pipe 22 is lifted upwards) and fed along the rail 12, even if the pipe 22 is a pipe with low rigidity, it can be fed along the rail 12 without needing to compensate for the rigidity of the pipe 22. If the pipe 22 is a pipe with low rigidity and is fed without suspending it from the movable part 13 (i.e., without lifting the pipe 22 upwards), the tip of the pipe 22 may droop downwards and interfere with other components during feeding.

[0055] Furthermore, since the pipe 22 is suspended from the movable part 13 and fed along the rail 12, even if the pipe 22 is a pipe with a planar curve (a pipe that is bent or curved in a horizontal plane), the pipe 22 moves along the rail 12, so there is little risk of interference with other components during feeding.

[0056] When the pipes 22 are straight pipes, and the pipes 22 are laid on a curved section of the bridge 100 (a section that is curved when viewed from above), it is preferable to adjust the angle between the pipes 22 so that they are in a positional relationship corresponding to the curve and then connect the pipes 22. However, even when the pipes 22 are connected in this way, as mentioned above, the pipes 22 move along the rails 12, so there is little risk of interference with other members during deployment. Figure 5(A) schematically shows a state in which straight pipes 22 are welded together in a straight line, and Figure 5(B) schematically shows a state in which, when laid on a curved section of the bridge 100, the angle between the straight pipes 22 is adjusted by cutting the ends together to correspond to the curved section, and then the pipes 22 are welded together. Even in the case of pipes that are bent and connected as shown in Figure 5(B), if the pipe 22 is fed out along the rail 12 using the pipe laying device 10 according to this first embodiment, the pipe 22 will move along the rail 12, so there is little risk of interference with other members during feeding.

[0057] The pipes 22 can be connected in any commonly used way. If the pipes 22 are used to carry fluids such as gas or tap water, they are typically connected by welding or mechanical joints such as flanges. If the pipes 22 serve as protective conduits for electrical wires, they are typically connected by mechanical joints such as screw-type joints or chemical joints such as welding or bonding. When the pipes 22 are steel pipes coated with a synthetic resin such as polyethylene and are connected by welding, the synthetic resin is removed from the surface of the steel pipe only within a predetermined range from the end to be welded. After welding is complete, the surface area from which the synthetic resin was removed is coated with synthetic resin.

[0058] As mentioned above, the moving section 13 can be, for example, a trolley. Of the trolleys that suspend the pipe 22, the leading trolley is a self-propelled trolley (for example, an electric trolley 14 (see Figures 8-2(C) and (D))), and the following trolleys are driven plain trolleys 16 without a self-propelled function (see Figures 8-2(C) and (D)). The leading self-propelled trolley can then be made to move on its own to feed the pipe 22 along the rail 12. Alternatively, all the trolleys that suspend the pipe 22 can be plain trolleys 16 without a self-propelled function. In this case, the pipe 22 can be fed out by pushing its rear end along the rail 12 (see Figures 10-2(C) and (D)). Alternatively, the pipe 22 can be sent along the rail 12 by pulling the leading plain trolley (rear plain trolley 26) of the trolleys that suspend the pipe 22 with a wire rope 30 (see Figures 12-2(C) and (D)).

[0059] The lever block 18 of the suspension section 17 has a lifting function to raise and lower the suspended object. The pipe 22 suspended from the movable section 13 by the suspension section 17 can be raised and lowered by the lever block 18. After the pipe 22 is sent above the target laying position, the suspended pipe 22 can be lowered by the lever block 18 of the suspension section 17 to the pipe support base 46 provided on the lower horizontal portion 50A of the L-shaped bracket 50. Then, as shown in Figure 4, the U-bolt 48 is positioned along the circumference of the pipe 22 to press down from above, and the lower end of the U-bolt 48 is fastened with a nut 48A to complete the laying of the pipe 22 to the target laying position. Furthermore, the installation of the pipe support base 46 on the lower horizontal portion 50A of the L-shaped bracket 50 and the operation of lowering the pipe 22 onto the pipe support base 46 using the lever block 18 of the suspension portion 17 can be performed using a bridge inspection vehicle or an aerial work platform, and temporary scaffolding is not required.

[0060] As described above, by using the pipe laying device according to this first embodiment, the pipes 22 can be laid by sending them out along the rails 12 arranged along the bridge 100. Furthermore, when attaching the rails 12 to the bridge 100, installing support members for that purpose, and when installing the pipe support base 46 or performing operations necessary for lowering the pipes 22 to the laying position, these can be done using a bridge inspection vehicle or an aerial work platform, eliminating the need for temporary scaffolding. Thus, by using the pipe laying device according to this first embodiment, the area of ​​temporary scaffolding required when laying the pipes 22 can be significantly reduced.

[0061] In this first embodiment, a lever block 18 was used in the suspension section 17, but any mechanism that can safely raise and lower the pipe 22 can be used instead of the lever block 18. Also, although a sling belt 20 was used in the suspension section 17, a steel wire rope or steel band may be used instead of the sling belt 20, provided that sufficient care is taken not to damage the pipe 22.

[0062] Furthermore, in this first embodiment, the upper horizontal portion 50B is detachably attached to a position near the center of the vertical portion 50C of the L-shaped bracket 50. However, if there is no problem in leaving the upper horizontal portion 50B in place even after the pipe 22 has been laid, it is not necessary to detachably attach the upper horizontal portion 50B, and it may be attached to the vertical portion 50C of the L-shaped bracket 50 by welding.

[0063] (1-2) Pipe laying method according to the first embodiment Figure 6 is a flowchart showing the procedure of the pipe laying method according to the first embodiment of the present invention, Figures 7-1 and 7-2 are schematic front views showing the status of seven typical steps of the pipe laying method according to the first embodiment of the present invention, and Figures 8-1, 8-2 and 8-3 are schematic side views showing the status of seven typical steps of the pipe laying method according to the first embodiment of the present invention.

[0064] The pipe laying method according to the first embodiment of the present invention is a pipe laying method that uses an electric trolley 14 as the leading trolley and plain trolleys 16 for the second and subsequent trolleys as the moving section 13, and as shown in the flowchart of Figure 6, the main process has seven steps, S1 to S7. In this pipe laying method according to the first embodiment, pipes 22 are laid below the curb 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction).

[0065] (Step S1) In the pipe laying method according to the first embodiment of the present invention, in step S1, as shown in the side view of Figure 8-1(A), the temporary stage scaffolding 40 on the sending side and the temporary stage scaffolding 42 on the arrival side are installed below the curb 102 of the bridge 100, and as shown in the front view of Figure 7-1(A) and the side view of Figure 8-1(A), the L-shaped brackets 50 are installed using a bridge inspection vehicle (not shown). Specifically, the mounting plate 50Z welded to the upper end of the vertical portion 50C of the L-shaped bracket 50 is attached to the side of the curb 102 with anchor bolts (not shown), and the L-shaped brackets 50 are installed at predetermined intervals in the direction in which the bridge 100 extends (in the bridge axis direction). The upper horizontal portion 50B is detachably attached to the position near the center of the vertical portion 50C of the L-shaped bracket 50. In the next step S2, the rail 12 is attached to the lower surface of the upper horizontal portion 50B. The bridge inspection vehicle to be used is one that can provide a work platform that enables work on the underside and side of the superstructure of the bridge 100. If an aerial work platform can be positioned below the bridge 100, the aerial work platform may be used instead of the bridge inspection vehicle to install the L-shaped bracket 50.

[0066] (Step S2) Step S2 is the process of installing the rail 12. Using a bridge inspection vehicle (not shown), the rail 12 is attached to the underside of the upper horizontal portion 50B, which is detachably attached to the vertical portion 50C of the L-shaped bracket 50, so that it is positioned above the location where the pipe 22 will be laid. Therefore, the rail 12 is installed below the curb portion 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction). If the point where the rail 12 is to be installed is in a planar curve area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve. The bridge inspection vehicle used is the same as the bridge inspection vehicle used in Step S1, and is capable of providing a work platform that enables work on the underside and side sides of the superstructure of the bridge 100. If an aerial work platform can be positioned below the bridge 100, the aerial work platform may be used instead of the bridge inspection vehicle to install the rail 12. The state after the rail 12 has been installed in step S2 is schematically shown in the front view of Figure 7-1(B) and the side view of Figure 8-1(B).

[0067] (Step S3) Step S3 is the process of setting the leading electric trolley 14 and the following plain trolley 16 on the rail 12 on the temporary stage scaffolding 40 on the sending side, and sending out the leading pipe 22. The situation in which Step S3 is being carried out is schematically shown in the front view of Figure 7-1(C) and the side view of Figure 8-2(C). The side view of Figure 8-2(C) is drawn assuming that there is one pipe 22 which is the leading pipe 22.

[0068] In step S3, the leading pipe 22 is suspended from the leading electric trolley 14 and the plain trolley 16 behind it by suspension parts 17 (lever block 18 and sling belt 20), and the electric trolley 14 is made to move under its own power to feed out the leading pipe 22 along the rail 12. The leading pipe 22 may be a single pipe 22, or it may be a jointed pipe made by connecting multiple pipes 22 in advance. When feeding out the leading pipe 22, the leading end of the leading pipe 22 is suspended from the electric trolley 14 by suspension parts 17, and the rear end is suspended from the plain trolley 16 by suspension parts 17, and then fed out.

[0069] (Step S4) Step S4 is a process in which, on the temporary stage scaffolding 40 on the sending side, the subsequent pipe 22 is connected to the previously sent-out pipe 22 (the previously sent-out pipe 22 may be referred to as the "preceding pipe" in this application) to form a pipe assembly 23, and the subsequent pipe 22 is suspended from the plain trolley 16 by the suspension part 17 (lever block 18 and sling belt 20), and the electric trolley 14 is made to move under its own power to send out the pipe assembly 23 along the rail 12. The pipe assembly 23 is a pipe formed by connecting the subsequent pipe 22 to the previously sent-out pipe 22 (preceding pipe). The situation in which Step S4 is being carried out is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 8-2(D). Note that the front view of Figure 7-2(D) is no different in terms of drawing representation from the front view of Figure 7-1(C) used in the explanation of Step S3.

[0070] In step S4, the subsequent pipe 22 is connected to the previously sent-out pipe 22 (leading pipe) to form a pipe connector 23. At the same time, each time the subsequent pipe 22 is suspended from the plain trolley 16 by the suspension part 17, the electric trolley 14 is made to move on its own to send out the pipe 22 (pipe connector 23) along the rail 12. The connection of the subsequent pipe 22 to the leading pipe is performed, for example, on a work platform (not shown) with a lifting function, and the pipes 22 are connected to each other by welding or the like.

[0071] If the target location for laying the pipe 22 is within the planar curve area of ​​the bridge 100, the ends of the pipes 22 are cut to match the planar curve and then joined together by welding or other means. In this case, it is preferable to pre-cut the ends of the pipes 22 at an angle to match the required cutting angle.

[0072] As described in the explanation of step S2 above, if the point where the rail 12 is installed is in a planar curved area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve. Since the electric trolley 14 and plain trolley 16, which suspend the pipe 22, move along the rail 12, the pipe 22 can move without interfering with other members even if there is a planar curved area in the bridge 100.

[0073] The first pipe 22 sent out in step S3 and the subsequent pipe 22 in step S4 (the pipe 22 to be sent out to be connected to the previously sent-out pipe 22 (leading pipe)) may be a single pipe 22, or a joint pipe formed by connecting multiple pipes 22 in advance. When a joint pipe formed by connecting multiple pipes 22 in advance is sent out by connecting it to the previously sent-out pipe 22 (leading pipe), it may be necessary to enlarge the area of ​​the temporary stage scaffolding 40 on the sending side. However, when a connection method that takes a certain amount of time, such as welding, is adopted, the efficiency of laying the pipes 22 can be improved in the construction work of laying the pipes 22 by preparing a joint pipe formed by connecting multiple pipes 22 in advance and sending out this joint pipe by connecting it to the previously sent-out pipe 22 (leading pipe). Furthermore, in both cases—whether using a connecting pipe as the leading pipe 22 or as a subsequent pipe 22—the usable connecting pipes are not limited to those in which pipes 22 are connected in a straight line. For example, connecting pipes in which pipes 22 are bent to correspond to the curved sections of the bridge can also be used.

[0074] Note that in the front views of Figures 7-1(C) and 7-2(D) and (E), the plain trolleys 16, which are the second trolleys from the front, are depicted as movable parts. However, if the leading trolley is depicted as a movable part, the electric trolley 14 would be drawn instead.

[0075] (Step S5) In step S5, all pipes 22 to be sent out are connected and sent out, and it is determined whether all pipes 22 have reached the target point and whether the sending out of all pipes 22 has been completed. If the sending out of all pipes 22 has not been completed, the process returns to step S4 and step S4 is repeated.

[0076] Once all pipes 22 have been fed out, proceed to the next step, S6. The state immediately before proceeding to the next step, S6 (the state after all pipes 22 have been fed out) is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 8-3(E). Note that the front view of Figure 7-2(D) is no different in drawing representation from the front view of Figure 7-1(C) used in the explanation of step S3.

[0077] (Step S6) In step S6, a bridge inspection vehicle (not shown) is used to install the pipe support base 46 on the lower horizontal portion 50A of the L-shaped bracket 50, and the pipes 22 (pipe connectors 23) are lowered onto the pipe support base 46 using a lever block 18. The bridge inspection vehicle used is the same as the bridge inspection vehicle used in step S1, and is capable of providing a work platform that enables work on the underside and sideside of the superstructure of the bridge 100. If an aerial work platform can be positioned below the bridge 100, the above work may be performed using the aerial work platform instead of the bridge inspection vehicle. When lowering, the pipes 22 (pipe connectors 23) are lowered sequentially, starting with the end pipes 22. The situation in which step S6 is being carried out is schematically shown in the front view of Figure 7-2(E) and the side view of Figure 8-3(E). Note that in the front view of Figure 7-2(E) and the side view of Figure 8-3(E), the pipe 22 is depicted in its position before being lowered. Also, because it is difficult to illustrate, the pipe support 46 is not shown in the side view of Figure 8-3(E), and therefore the side view of Figure 8-3(E) is the same as the drawing used in the explanation of step S5.

[0078] (Step S7) Once the lowering of the pipe 22 (pipe connector 23) in step S6 is complete, the U-bolt 48 is positioned along the circumference of the pipe 22 to press down from above, and the lower end of the U-bolt 48 is fastened with a nut 48A to complete the laying of the pipe 22 to the target laying position. After the laying of the pipe 22 to the target laying position is complete, the electric trolley 14, plain trolley 16, rail 12, upper horizontal section 50B attached to the L-shaped bracket 50, and temporary stage scaffolding 40, 42 are removed. The state after the completion of this step S7, when the laying of the pipe 22 to the target laying position and the removal of materials and equipment are complete, is schematically shown in the front view of Figure 7-2(F) and the side view of Figure 8-3(F).

[0079] As described above, in the pipe laying method according to this first embodiment, the pipe 22 is laid by sending it out along the rail 12 arranged along the bridge 100. When attaching the rail 12 to the bridge 100 and installing the support members therefor, and when installing the pipe support base 46 and performing the operations necessary to lower the pipe 22 to the laying position, a bridge inspection vehicle or an aerial work platform can be used, eliminating the need for temporary scaffolding. By using the pipe laying method according to this first embodiment, the area of ​​temporary scaffolding required when laying the pipe 22 can be significantly reduced.

[0080] (1-3) First modified example of the pipe laying method according to the first embodiment Figure 9 is a flowchart showing the procedure of a first modified example of the pipe laying method according to the first embodiment of the present invention; Figures 7-1 and 7-2 are schematic front views showing the status of seven typical steps of the first modified example of the pipe laying method according to the first embodiment of the present invention; and Figures 10-1, 10-2, and 10-3 are schematic side views showing the status of seven typical steps of the first modified example of the pipe laying method according to the first embodiment of the present invention.

[0081] The first modified example of the pipe laying method according to the first embodiment of the present invention is a pipe laying method in which all plain trolleys 16 are used as the trolleys as the movable parts 13, and the connected pipes 22 (pipe connectors 23) are pushed out along the rails 12 and fed along the rails 12. However, there are many points in common with the pipe laying method according to the first embodiment described above, and the same content as described in "(1-2) Pipe Laying Method According to the First Embodiment" may be omitted as appropriate. In addition, the front views (Figures 7-1(A), (B), (C), 7-2(D), (E), (F)) used in the description of "(1-2) Pipe Laying Method According to the First Embodiment" can also be used in the description of this first modified example, and will therefore be used in the description of this first modified example as well.

[0082] A first modified example of the pipe laying method according to the first embodiment of the present invention has seven main steps, S11 to S17, as shown in the flowchart of Figure 9. In this first modified example of the pipe laying method, a pipe 22 is laid below the curb portion 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction).

[0083] (Step S11) Step S11 is the same process as step S1 of the pipe laying method according to the first embodiment described above. In the pipe laying method according to this first modified example, in step S11, as shown in the side view of Figure 10-1(A), the temporary stage scaffolding 40 on the sending side and the temporary stage scaffolding 42 on the arrival side are installed below the curb 102 of the bridge 100, and the L-shaped brackets 50 are installed using a bridge inspection vehicle (not shown) as shown in the front view of Figure 7-1(A) and the side view of Figure 10-1(A). Specifically, the mounting plate 50Z welded to the upper end of the vertical portion 50C of the L-shaped bracket 50 is attached to the side of the curb 102 with anchor bolts (not shown), and the L-shaped brackets 50 are installed at predetermined intervals in the direction in which the bridge 100 extends (in the bridge axis direction). The upper horizontal portion 50B is detachably attached to a position near the center of the vertical portion 50C of the L-shaped bracket 50. In the next step S12, the rail 12 will be attached to the underside of the upper horizontal section 50B.

[0084] (Step S12) Step S12 is a process of installing the rail 12, similar to step S2 of the pipe laying method according to the first embodiment described above. Using a bridge inspection vehicle (not shown), the rail 12 is attached to the lower surface of the upper horizontal portion 50B, which is detachably attached to the vertical portion 50C of the L-shaped bracket 50, so that it is positioned above the location where the pipe 22 will be laid. Therefore, the rail 12 is installed below the curb portion 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction). If the point where the rail 12 is to be installed is in a planar curve area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve. The state after the rail 12 has been installed in step S12 is schematically shown in the front view of Figure 7-1(B) and the side view of Figure 10-1(B).

[0085] (Step S13) Step S13 is the process of setting the plain trolley 16 on the rail 12 on the temporary stage scaffolding 40 on the sending side and sending out the leading pipe 22. The situation in which step S13 is being carried out is schematically shown in the front view of Figure 7-1(C) and the side view of Figure 10-2(C). The side view of Figure 10-2(C) is drawn assuming that the leading pipe 22 is a connecting pipe made by linking two pipes 22 together.

[0086] In step S13, the leading pipe 22 is pushed along the rail 12 while suspended from the leading plain trolley 16 by the suspension section 17 (lever block 18 and sling belt 20), thereby feeding out the leading pipe 22 along the rail 12. The leading pipe 22 may be a single pipe 22, or it may be a jointed pipe made by connecting multiple pipes 22 in advance. When feeding out the leading pipe 22, the leading pipe 22 is fed out while suspended from the plain trolley 16 by the suspension section 17 at both its front and rear ends.

[0087] (Step S14) Step S14 involves connecting the subsequent pipe 22 to the previously sent-out pipe 22 (leading pipe) on the temporary stage scaffolding 40 on the sending-out side to form a pipe connector 23, and suspending the subsequent pipe 22 from the plain trolley 16 using the suspension section 17 (lever block 18 and sling belt 20), pushing the pipe connector 23 along the rail 12, thereby sending the pipe connector 23 along the rail 12. The pipe connector 23 is a pipe formed by connecting the subsequent pipe 22 to the previously sent-out pipe 22 (leading pipe). The situation in which Step S14 is being carried out is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 10-2(D). Note that the front view of Figure 7-2(D) is no different in terms of drawing representation from the front view of Figure 7-1(C) used in the explanation of Step S13.

[0088] In step S14, the subsequent pipe 22 is connected to the previously fed pipe 22 to form a pipe connector 23. Each time the subsequent pipe 22 is suspended from the plain trolley 16 by the suspension part 17, the connected pipe 22 (pipe connector 23) is pushed along the rail 12, and the pipe 22 (pipe connector 23) is fed along the rail 12. The connection of the subsequent pipe 22 to the preceding pipe is performed, for example, on a work table (not shown) with a lifting function, and the pipes 22 are connected to each other by welding or the like.

[0089] If the target location for laying the pipe 22 is within the planar curve area of ​​the bridge 100, the ends of the pipes 22 are cut to match the planar curve and then joined together by welding or other means. In this case, it is preferable to pre-cut the ends of the pipes 22 at an angle to match the required cutting angle.

[0090] As described in the explanation of step S12 above, if the point where the rail 12 is installed is in a planar curved area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve, and the plain trolley 16 with the pipe 22 suspended along the rail 12 moves along it, so even if there is a planar curved area in the bridge 100, the pipe 22 can move without interfering with other members.

[0091] The leading pipe 22 initially sent out in step S13 and the subsequent pipe 22 in step S14 (the pipe 22 to be sent out to be connected to the previously sent-out pipe 22 (leading pipe)) may be a single pipe 22, or a joint pipe formed by connecting multiple pipes 22 in advance. When a joint pipe formed by connecting multiple pipes 22 in advance is sent out by connecting it to the previously sent-out pipe 22 (leading pipe), it may be necessary to enlarge the area of ​​the temporary stage scaffolding 40 on the sending side. However, when a connection method that takes a certain amount of time, such as welding, is adopted, the efficiency of laying the pipes 22 can be improved in the construction of laying the pipes 22 by preparing a joint pipe formed by connecting multiple pipes 22 in advance and sending out this joint pipe by connecting it to the previously sent-out pipe 22 (leading pipe). Furthermore, in both cases—whether using a connecting pipe as the leading pipe 22 or as a subsequent pipe 22—the usable connecting pipes are not limited to those in which pipes 22 are connected in a straight line. For example, connecting pipes in which pipes 22 are bent to correspond to the curved sections of the bridge can also be used.

[0092] (Step S15) In step S15, all pipes 22 to be sent out are connected and sent out, and it is determined whether all pipes 22 have reached the target point and whether the sending out of all pipes 22 has been completed. If the sending out of all pipes 22 has not been completed, the process returns to step S14 and steps S14 are repeated.

[0093] Once all pipes 22 have been fed out, proceed to the next step S16. The state immediately before proceeding to the next step S16 (the state after all pipes 22 have been fed out) is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 10-3(E).

[0094] (Step S16) In step S16, similar to step S6 of the pipe laying method according to the first embodiment described earlier, a bridge inspection vehicle (not shown) is used to install the pipe support base 46 on the lower horizontal portion 50A of the L-shaped bracket 50, and the pipes 22 (pipe connectors 23) are lowered onto the pipe support base 46 using a lever block 18. When lowering, the pipes 22 (pipe connectors 23) are lowered sequentially, starting from the end pipes 22. The situation in which step S16 is being carried out is schematically shown in the front view of Figure 7-2(E) and the side view of Figure 10-3(E). Note that in the front view of Figure 7-2(E) and the side view of Figure 10-3(E), the pipes 22 are depicted in their position before being lowered. Furthermore, because it is difficult to illustrate, the pipe support 46 is not shown in the side view of Figure 10-3(E). For this reason, the side view of Figure 10-3(E) is the same as the drawing used in the explanation of step S15.

[0095] (Step S17) Once the lowering of the pipe 22 (pipe connector 23) in step S16 is complete, the U-bolt 48 is positioned to press down on the pipe 22 from above along its circumference, similar to step S7 of the pipe laying method according to the first embodiment described earlier, and the lower end of the U-bolt 48 is fastened with a nut 48A to complete the laying of the pipe 22 to the target laying position. After the laying of the pipe 22 to the target laying position is complete, the upper horizontal section 50B attached to the plain trolley 16, rail 12, L-shaped bracket 50, and temporary stage scaffolding 40, 42 are removed. The state after completing step S17, when the laying of the pipe 22 to the target laying position and the removal of materials and equipment are complete, is schematically shown in the front view of Figure 7-2(F) and the side view of Figure 10-3(F).

[0096] As explained above, in the pipe laying method according to this first modified example, similar to the pipe laying method according to the first embodiment, the pipe 22 is laid by sending it out along the rail 12 arranged along the bridge 100. However, when attaching the rail 12 to the bridge 100 and installing the support members therefor, and when installing the pipe support base 46 and performing the operations necessary to lower the pipe 22 to the laying position, a bridge inspection vehicle or an aerial work platform can be used, eliminating the need for temporary scaffolding. By using the pipe laying method according to this first modified example, the area of ​​temporary scaffolding required when laying the pipe 22 can be significantly reduced.

[0097] (1-4) Second modified example of the pipe laying method according to the first embodiment Figure 11 is a flowchart showing the procedure of a second modified example of the pipe laying method according to the first embodiment of the present invention; Figures 7-1 and 7-2 are schematic front views showing the status of seven typical steps of the second modified example of the pipe laying method according to the first embodiment of the present invention; and Figures 12-1, 12-2, and 12-3 are schematic side views showing the status of seven typical steps of the second modified example of the pipe laying method according to the first embodiment of the present invention.

[0098] A second modification of the pipe laying method according to the first embodiment of the present invention uses plain trolleys for all of the trolleys as the moving parts 13, and pulls the leading trailing plain trolley 26 of the trailing plain trolleys 26 from which the pipes 22 are suspended along the rail 12 with a wire rope 30 to feed out the connected pipes 22 (pipe connectors 23) along the rail 12. This method has many points in common with the pipe laying method according to the first embodiment and the pipe laying method according to the first modification of the first embodiment described above, and the same content as described in "(1-2) Pipe laying method according to the first embodiment" and "(1-3) First modification of the pipe laying method according to the first embodiment" may be omitted as appropriate. In addition, the front views (Figures 7-1(A), (B), (C), 7-2(D), (E), (F)) used in the description of "(1-2) Pipe laying method according to the first embodiment" can also be used in the description of this second modification, and will therefore be used in the description of this second modification as well. However, for Figures 7-1(C), 7-2(D), and (E), the plain trolley 16 in the figures should be replaced with the trailing plain trolley 26.

[0099] A second modified example of the pipe laying method according to the first embodiment of the present invention has seven main steps, S21 to S27, as shown in the flowchart of Figure 11. In this second modified example of the pipe laying method, the pipe 22 is laid below the curb portion 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction).

[0100] (Step S21) Step S21 is the same process as step S1 of the pipe laying method according to the first embodiment described above. In the pipe laying method according to this second modified example, in step S21, as shown in the side view of Figure 12-1(A), the temporary stage scaffolding 40 on the sending side and the temporary stage scaffolding 42 on the arrival side are installed below the curb 102 of the bridge 100, and the L-shaped brackets 50 are installed using a bridge inspection vehicle (not shown) as shown in the front view of Figure 7-1(A) and the side view of Figure 12-1(A). Specifically, the mounting plate 50Z welded to the upper end of the vertical portion 50C of the L-shaped bracket 50 is attached to the side of the curb 102 with anchor bolts (not shown), and the L-shaped brackets 50 are installed at predetermined intervals in the direction in which the bridge 100 extends (in the bridge axis direction). The upper horizontal portion 50B is detachably attached to a position near the center of the vertical portion 50C of the L-shaped bracket 50. In the next step S22, the rail 12 will be attached to the underside of the upper horizontal section 50B.

[0101] (Step S22) Step S22 is a process of installing the rail 12, similar to step S2 of the pipe laying method according to the first embodiment described earlier. Using a bridge inspection vehicle (not shown), the rail 12 is attached to the lower surface of the upper horizontal portion 50B, which is detachably attached to the vertical portion 50C of the L-shaped bracket 50, so that it is positioned above the location where the pipe 22 will be laid. Therefore, the rail 12 is installed below the curb portion 102 of the bridge 100, along the bridge 100, in the direction in which the bridge 100 extends (in the bridge axis direction). If the point where the rail 12 is to be installed is in a planar curve area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve. The state after the rail 12 has been installed in step S22 is schematically shown in the front view of Figure 7-1(B) and the side view of Figure 12-1(B).

[0102] (Step S23) Step S23 involves installing a leading plain trolley 24, positioned at the front in the direction of travel and not suspending the pipe 22, and a trailing plain trolley 26, positioned at the rear in the direction of travel and suspending the pipe 22, on the temporary stage scaffolding 40 on the sending side, on the rail 12, and simultaneously sending out the leading pipe 22 along the rail 12. The situation in which Step S23 is being carried out is schematically shown in the front view of Figure 7-1(C) and the side view of Figure 12-2(C). The side view of Figure 12-2(C) is drawn assuming that one pipe 22 is the leading pipe 22.

[0103] In step S23, the leading pipe 22 is suspended from the leading trailing plain trolley 26 by a suspension section 17 (lever block 18 and sling belt 20), and a winch 44 positioned on the arrival side temporary stage scaffolding 42 pulls the wire rope 30 to pull the leading trailing plain trolley 26 with the wire rope 30, sending the leading pipe 22 along the rail 12. The leading pipe 22 may be a single pipe 22, or it may be a jointed pipe made by connecting multiple pipes 22 in advance. When sending out the leading pipe 22, the leading pipe 22 is sent out with its front and rear ends suspended from the trailing plain trolley 26 by the suspension sections 17.

[0104] (Step S24) Step S24 is a process in which, on the temporary stage scaffolding 40 on the sending side, the trailing pipe 22 is connected to the previously sent-out pipe 22 (leading pipe) to form a pipe connection 23, and each time the trailing pipe 22 is suspended from the trailing plain trolley 26 by the suspension section 17 (lever block 18 and sling belt 20), the leading trailing plain trolley 26 is pulled by the wire rope 30 to send out the pipe connection 23 along the rail 12. The pipe connection 23 is a pipe formed by connecting the trailing pipe 22 to the previously sent-out pipe 22 (leading pipe). The situation in which Step S24 is being carried out is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 12-2(D). Note that the front view of Figure 7-2(D) is no different in drawing representation from the front view of Figure 7-1(C) used in the explanation of Step S23.

[0105] The wire rope 30 is pulled by a winch 44 positioned on the temporary stage scaffolding 42 on the arrival side. The subsequent pipe 22 is connected to the preceding pipe, for example, on a work platform (not shown) with a lifting function, and the pipes 22 are connected to each other by welding or the like.

[0106] If the target location for laying the pipe 22 is within the planar curve area of ​​the bridge 100, the ends of the pipes 22 are cut to match the planar curve and then joined together by welding or other means. In this case, it is preferable to pre-cut the ends of the pipes 22 at an angle to match the required cutting angle.

[0107] As described in the explanation of step S22 above, if the point where the rail 12 is installed is in a planar curved area of ​​the bridge 100, the rail 12 is installed to correspond to that planar curve, and the trailing plain trolley 26 with the pipe 22 suspended along the rail 12 moves forward, so even if there is a planar curved area in the bridge 100, the pipe 22 can move forward without interfering with other members.

[0108] The leading pipe 22 initially sent out in step S23 and the subsequent pipe 22 in step S24 (the pipe 22 to be sent out to be connected to the previously sent-out pipe 22 (leading pipe)) may be a single pipe 22, or a joint pipe formed by connecting multiple pipes 22 in advance. When a joint pipe formed by connecting multiple pipes 22 in advance is sent out by connecting it to the previously sent-out pipe 22 (leading pipe), it may be necessary to enlarge the area of ​​the temporary stage scaffolding 40 on the sending side. However, when a connection method that takes a certain amount of time, such as welding, is adopted, the efficiency of laying the pipes 22 can be improved in the construction of laying the pipes 22 by preparing a joint pipe formed by connecting multiple pipes 22 in advance and sending out this joint pipe by connecting it to the previously sent-out pipe 22 (leading pipe). Furthermore, in both cases—whether using a connecting pipe as the leading pipe 22 or as a subsequent pipe 22—the usable connecting pipes are not limited to those in which pipes 22 are connected in a straight line. For example, connecting pipes in which pipes 22 are bent to correspond to the curved sections of the bridge can also be used.

[0109] Further explanation will be given regarding the leading plain trolley 24 and trailing plain trolley 26 used in the pipe laying method according to this second modified example.

[0110] A suspension section 17 is attached to the trailing plain trolley 26, and the pipe 22 is suspended by the suspension section 17. A wire rope 30 is attached to the leading trailing plain trolley 26, and a winch 44 positioned on the temporary stage scaffolding 42 on the arrival side pulls the wire rope 30, pulling the leading trailing plain trolley 26 along the rail 12 and feeding the pipe 22 along the rail 12. A wire guide mechanism 32 is attached to the leading plain trolley 24, which is connected to the wire rope 30 and guides the wire rope 30 to follow the rail 12. The leading trailing plain trolley 26 is always pulled by the wire rope 30 in the direction along the rail 12, even in the planar curve area of ​​the bridge 100, so the pipe 22 is fed smoothly in the direction along the rail 12. The lead plain trolley 24, once it reaches the temporary stage scaffolding 42 on the arrival side, is retrieved by the workers on the temporary stage scaffolding 42 on the arrival side.

[0111] Figure 13 is an enlarged front view showing the wire guide mechanism 32, and Figure 14 is an enlarged side view showing the wire guide mechanism 32.

[0112] The wire guide mechanism 32 comprises a wire support 34, a shackle 36, a connecting bolt 38, and a nut 38A. The wire support 34 is connected to the wire rope 30 so as to cover the wire rope 30 in the circumferential direction, and the shackle 36 is inserted through a locking through hole 34A provided at the top of the wire support 34. The wire support 34 connected to the wire rope 30 is connected to the lower part of the leading plain trolley 24 via the shackle 36 and the connecting bolt 38, and the wire rope 30 is always guided to follow the rail 12. As a result, the leading trailing plain trolley 26 is always pulled by the wire rope 30 in the direction along the rail 12, even in the planar curve area of ​​the bridge 100, so that the pipe 22 can be smoothly fed in the direction along the rail 12.

[0113] (Step S25) In step S25, all pipes 22 to be sent out are connected and sent out, and it is determined whether all pipes 22 have reached the target point and whether the sending out of all pipes 22 has been completed. If the sending out of all pipes 22 has not been completed, the process returns to step S24 and steps S24 are repeated.

[0114] Once all pipes 22 have been fed out, proceed to the next step S26. The state immediately before proceeding to the next step S26 (the state after all pipes 22 have been fed out) is schematically shown in the front view of Figure 7-2(D) and the side view of Figure 12-3(E).

[0115] (Step S26) In step S26, similar to step S6 of the pipe laying method according to the first embodiment described earlier, a bridge inspection vehicle (not shown) is used to install the pipe support base 46 on the lower horizontal portion 50A of the L-shaped bracket 50, and the pipes 22 (pipe connectors 23) are lowered onto the pipe support base 46 using a lever block 18. When lowering, the pipes 22 (pipe connectors 23) are lowered sequentially, starting from the end pipes 22. The situation in which step S26 is being carried out is schematically shown in the front view of Figure 7-2(E) and the side view of Figure 12-3(E). Note that in the front view of Figure 7-2(E) and the side view of Figure 12-3(E), the pipes 22 are depicted in their position before being lowered. Furthermore, because it is difficult to illustrate, the pipe support base 46 is not shown in the side view of Figure 12-3(E). For this reason, the side view of Figure 12-3(E) is the same as the drawing used in the explanation of step S25.

[0116] (Step S27) Once the lowering of the pipe 22 (pipe connector 23) in step S26 is complete, the U-bolt 48 is positioned to press down on the pipe 22 from above along its circumference, similar to step S7 of the pipe laying method according to the first embodiment described earlier, and the lower end of the U-bolt 48 is fastened with a nut 48A to complete the laying of the pipe 22 to the target laying position. After the laying of the pipe 22 to the target laying position is complete, the leading plain trolley 24, trailing plain trolley 26, rail 12, upper horizontal section 50B attached to the L-shaped bracket 50, winch 44, and temporary stage scaffolding 40, 42 are removed. The state after completing step S27, when the laying of the pipe 22 to the target laying position and the removal of materials and equipment are complete, is schematically shown in the front view of Figure 7-2(F) and the side view of Figure 12-3(F).

[0117] As explained above, in the pipe laying method according to this second modified example, similar to the pipe laying method according to the first embodiment, the pipe 22 is laid by sending it out along the rail 12 arranged along the bridge 100. However, when attaching the rail 12 to the bridge 100 and installing the support members therefor, and when installing the pipe support 46 and performing the operations necessary to lower the pipe 22 to the laying position, a bridge inspection vehicle or an aerial work platform can be used, eliminating the need for temporary scaffolding. By using the pipe laying method according to this second modified example, the area of ​​temporary scaffolding required when laying the pipe 22 can be significantly reduced.

[0118] (1-5) Modification of the support part In the pipe laying device 10 and pipe laying method according to the first embodiment described above, and the pipe laying method according to the first embodiment and its modified versions (first modified version, second modified version), the member that serves as a support for the rail 12 is the upper horizontal portion 50B attached to the vertical portion 50C of the L-shaped bracket 50, and the member that serves as a support on which the laid pipe 22 is finally placed is the lower horizontal portion 50A of the L-shaped bracket 50. However, the form of the support for the rail 12 is not limited to the upper horizontal portion 50B attached to the vertical portion 50C of the L-shaped bracket 50, and the form of the support on which the laid pipe 22 is finally placed is not limited to the lower horizontal portion 50A of the L-shaped bracket 50. Various forms can be adopted, and these forms will be described below.

[0119] Figure 15 shows a first modified example of the support part in the first embodiment (upper horizontal portion 52B, lower horizontal portion 52A of the L-shaped bracket 52). Figure 15(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 15(B) is a front view showing the state in which the laying of the pipe 22 is completed. As shown in Figure 15, a mounting plate 52Z is ​​welded to the upper end of the vertical portion 52C of the L-shaped bracket 52, and the mounting plate 52Z is ​​attached to the side of the curb portion 102 with anchor bolts (not shown) so that the lower horizontal portion 52A is positioned outside the curb portion 102, and the L-shaped bracket 52 is attached to the bridge 100. In this first modified example, all parts of the support part are located outside the curb portion 102, making it easy to use when there is no space below the curb portion 102. The upper horizontal section 52B is detachably attached (for example, by bolting) near the upper end of the vertical section 52C, and is positioned above the lower horizontal section 52A. When the laying of the pipe 22 is complete, the upper horizontal section 52B is removed, as shown in Figure 15(B).

[0120] Figure 16 shows a second modified example of the support part in the first embodiment (upper horizontal part 54B, lower horizontal part 54A of the L-shaped bracket 54). Figure 16(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 16(B) is a front view showing the state in which the laying of the pipe 22 is completed. As shown in Figure 16, a mounting plate 54Z is welded to the upper end of the vertical part 54C of the L-shaped bracket 54, and the mounting plate 54Z is attached to the side of the curb part 102 with anchor bolts (not shown) so that the lower horizontal part 54A is positioned below the curb part 102, and the L-shaped bracket 54 is attached to the bridge 100. The vertical part 54C is bent so as to protrude outward in the width direction of the bridge 100 at a position slightly above the center (bend 54D), and is shaped to easily accommodate cases where there is insufficient space on the inside in the width direction below the curb part 102. The upper horizontal section 54B is detachably attached (for example, by bolt connection) near the center of the vertical section 54C (near and below the bend 54D), and is positioned above the lower horizontal section 54A. When the laying of the pipe 22 is complete, the upper horizontal section 54B is removed, as shown in Figure 16(B).

[0121] Figure 17 shows a third modified example of the support in the first embodiment (upper horizontal portion 56B, lower horizontal portion 56A of the L-shaped bracket 56). Figure 17(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 17(B) is a front view showing the state in which the laying of the pipe 22 is completed. As shown in Figure 17, a mounting plate 56Z is welded to the upper end of the vertical portion 56C of the L-shaped bracket 56, and the mounting plate 56Z is attached to the side of the curb portion 102 with anchor bolts (not shown) so that the lower horizontal portion 56A is positioned on the opposite side of the bridge 100 from the vertical portion 56C, and the L-shaped bracket 56 is attached to the bridge 100. The vertical section 56C is bent slightly above the center (at the bend 56D) so as to curve inward in the width direction of the bridge 100 (below the curb 102), making it easy to accommodate situations where there is limited space near the side of the curb 102 (for example, when there are buildings or other structures near the side of the bridge 100). The upper horizontal section 56B is detachably attached (for example, by bolt connection) near the center of the vertical section 56C (near and below the bend 56D), and is positioned above the lower horizontal section 56A. When the laying of the pipe 22 is complete, the upper horizontal section 56B is removed, as shown in Figure 17(B).

[0122] Figure 18 shows a fourth modified example of the support in the first embodiment (upper horizontal portion 58B, lower horizontal portion 58A of the L-shaped bracket 58), where Figure 18(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 18(B) is a front view showing the state in which the laying of the pipe 22 is completed. As shown in Figure 18, the upper end of the vertical portion 58C of the L-shaped bracket 58 protrudes (protruding portion 58D) in the opposite direction to the protruding direction of the lower horizontal portion 58A, and a mounting plate 58Z is welded to the protruding side surface of the protruding portion 58D, and the mounting plate 58Z is attached to the side surface of the curb portion 102 with anchor bolts (not shown) so that the lower horizontal portion 58A is positioned outside the curb portion 102, and the L-shaped bracket 58 is attached to the bridge 100. In this fourth modified example, the support portion is located entirely outside the curb section 102, and the vertical portion 58C is positioned at a distance from the bridge 100 by the protruding portion 58D, making it easy to accommodate even when there is no space below the curb section 102. The upper horizontal portion 58B is detachably attached (for example, by bolt connection) near the upper end of the vertical portion 58C, and is positioned above the lower horizontal portion 58A. When the laying of the pipe 22 is completed, the upper horizontal portion 58B is removed as shown in Figure 18(B).

[0123] Figure 19 shows a fifth modified example of the support part in the first embodiment (upper horizontal portion 60B and lower horizontal portion 60A of the rectangular bracket 60). Figure 19(A) is a front view showing the pipe 22 being fed out, and Figure 19(B) is a front view showing the pipe 22 after the laying is complete. As shown in Figure 19, a mounting plate 60Z is welded to the upper end of the vertical portion 60C of the rectangular bracket 60, and the mounting plate 60Z is attached to the side of the curb portion 102 with anchor bolts (not shown) so that the lower horizontal portion 60A is positioned outside the curb portion 102, and the rectangular bracket 60 is attached to the bridge 100. Because the rectangular bracket 60 is rectangular in shape, it is stable and can easily accommodate heavy pipes 22. In addition, all parts of the support part according to this fifth modified example are located outside the curb portion 102, making it easy to use when there is no space below the curb portion 102. The upper horizontal section 60B is attached near the upper end of the vertical section 60C, and positioned above the lower horizontal section 60A.

[0124] Figure 20 shows a sixth modified example of the support in the first embodiment (upper horizontal portion 62B and lower horizontal portion 62A of the rectangular bracket 62). Figure 20(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 20(B) is a front view showing the state in which the laying of the pipe 22 is completed. As shown in Figure 20, at least one of the upper end of the vertical portion 62C or the upper horizontal portion 62B of the rectangular bracket 62 is attached to the lower surface of the superstructure 106 of the bridge 100, and the rectangular bracket 62 is attached to the bridge 100. This configuration is suitable when there is sufficient space below the superstructure 106 of the bridge 100. Because the rectangular bracket 62 is rectangular in shape, it has a stable shape and can easily accommodate heavy pipes 22. The upper horizontal portion 62B is attached near the upper end of the vertical portion 62C and above the lower horizontal portion 62A.

[0125] Figure 21 shows a seventh modified example of the support in the first embodiment (upper horizontal portion 64B of the diagonal bracket 64, lower horizontal portion 66A of the L-shaped bracket 66). Figure 21(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 21(B) is a front view showing the state in which the laying of the pipe 22 is completed. In this seventh modified example, the diagonal bracket 64 having an upper horizontal portion 64B and the L-shaped bracket 66 having a lower horizontal portion 66A are configured as separate components.

[0126] As shown in Figure 21, the brace bracket 64 is composed of a brace 64A and an upper horizontal portion 64B. The lower end of the brace 64A is detachably connected to at least one of the lower end of the railing 104 or the upper surface of the curb 102, and one end 64B1 of the upper horizontal portion 64B is detachably connected to the upper end of the railing 104. The brace bracket 64 is detachably attached to the bridge 100. The rail 12 is attached to the lower surface of the other end 64B2 of the upper horizontal portion 64B of the brace bracket 64.

[0127] A mounting plate 66Z is welded to the vertical portion 66C of the L-shaped bracket 66, and the mounting plate 66Z is attached to the side of the curb portion 102 with anchor bolts (not shown) so that the lower horizontal portion 66A is positioned outside the curb portion 102, and the L-shaped bracket 66 is attached to the bridge 100. In this seventh modification, the length of the vertical portion 66C of the L-shaped bracket 66 can be shortened. When the laying of the pipe 22 is completed, the bracing bracket 64 is removed as shown in Figure 21(B). The only remaining support after the removal of the bracing bracket 64 is the L-shaped bracket 66 with a shorter vertical portion 66C, and this seventh modification is an embodiment in which the support portion is reduced when the laying of the pipe 22 is completed.

[0128] (1-6) Supplementary Information In the pipe laying methods according to the first embodiment and its modified versions (first modified version, second modified version) described above, multiple trolleys are used as the moving section 13. However, for example, in the case of a short bridge, if safety can be confirmed, the pipe 22 may be fed using only one trolley that suspends only the leading end of the pipe 22 to be fed. In the pipe laying method according to the first embodiment, only one electric trolley 14 is used as the moving section 13. In the pipe laying method according to the first modified version of the first embodiment, only one plain trolley 16 is used as the moving section 13. In the pipe laying method according to the second modified version of the first embodiment, only one trailing plain trolley 26 is used as the moving section 13 that suspends the pipe 22. In this case, the trailing end of the pipe 22 is supported by a work platform (for example, a work platform having a lifting function and a roller mechanism on its upper surface that can smoothly feed out pipes) (not shown) provided on the temporary stage scaffolding 40 on the feeding side, and the pipe 22 is fed out.

[0129] Furthermore, it is not necessary to always suspend a single pipe 22 from one or more movable parts 13; the arrangement of the movable parts 13 (movable parts 13 to which the suspension parts 17 are attached) should be planned at an economically and structurally appropriate interval. Specifically, an appropriate suspension interval (the interval between movable parts 13 to which the suspension parts 17 are attached) should be planned within a range that does not cause problems, taking into account the characteristics of the pipe 22, the strength and rigidity of the rail 12, and the load-bearing capacity of the movable parts 13 and suspension parts 17. However, in order to prevent the leading end of the pipe from sagging, it is necessary to suspend at least the leading end of the pipe 22 being fed out first from the movable part 13.

[0130] Furthermore, in the pipe laying method according to the second modification of the first embodiment, a leading plain trolley 24 equipped with a wire guide mechanism 32 that guides a wire rope 30 along the rail 12 is placed in front of the trailing plain trolley 26 that suspends the connected pipes 22 by a suspension section 17. However, if the bridge 100 on which the pipes 22 are laid does not have a planar curve and the bridge 100 is a straight bridge when viewed from above, the leading trailing plain trolley 26 can always be pulled in the direction along the rail 12 by the wire rope 30 even without placing the leading plain trolley 24 equipped with the wire guide mechanism 32. In such cases, the leading trailing plain trolley 26 may be pulled by the wire rope 30 without placing the leading plain trolley 24 equipped with the wire guide mechanism 32.

[0131] (2) Second Embodiment (2-1) Pipe laying device according to the second embodiment Figure 22 is a front view of the pipe laying device 70 according to the second embodiment of the present invention, Figure 23 is an enlarged front view showing an enlarged view of the main part of the pipe laying device 70 according to the second embodiment of the present invention, Figure 24 is an enlarged side view showing an enlarged view of the main part of the pipe laying device 70 according to the second embodiment of the present invention, and Figure 25 is a front view showing the state in which pipe laying has been completed using the pipe laying device 70 according to the second embodiment of the present invention. Among the components used in the pipe laying device 70 according to this second embodiment and the members related to the pipe laying device 70, corresponding components and members that have the same function as the components used in the pipe laying device 10 according to the first embodiment will be referred to by the same reference numerals and will be omitted in principle.

[0132] The bridge 110 is a bridge in which bridge brackets 114 are attached to a box girder 112 which is the main girder. Side longitudinal girders 116 are provided along the bridge axis direction at the ends of the bridge brackets 114 (the ends on the outside in the width direction of the bridge 110), and a curb 118 is provided above the side longitudinal girders 116. The pipe laying device 70 according to this second embodiment is a pipe laying device applied to such a bridge 110, and lays pipes 22 below the side longitudinal girders 116 along the direction in which the bridge 110 extends.

[0133] The pipe laying device 70 according to this second embodiment includes a side longitudinal beam 116, a rail 12, a movable part 13, and a suspension part 17, the movable part 13 moves along the rail 12 with the pipe 22 suspended from it.

[0134] A rail mounting plate 12A is welded to the upper surface of the upper flange of the rail 12. The rail mounting plate 12A is a steel plate that is wider than the upper flange width of the rail 12 and has a width about the same as the lower flange width of the side longitudinal girder 116. The portion of the rail mounting plate 12A that extends beyond the upper flange of the rail 12 and the portion of the side longitudinal girder 116 that extends beyond the lower flange are sandwiched and connected by a fixing member 72 via a spacer 12B. The spacer 12B is provided at intervals in the direction in which the side longitudinal girder 116 extends in order to avoid interference with bolts, nuts, etc. used to attach the splice plate attached to the lower flange of the side longitudinal girder 116. The fixing member 72 can be any object that can stably fix the rail mounting plate 12A and the lower flange of the side longitudinal girder 116 by sandwiching them together, and if safety can be ensured, a clamp, for example, can be used.

[0135] (2-2) Pipe laying method according to the second embodiment Figure 26 is a flowchart showing the procedure of the pipe laying method according to the second embodiment of the present invention, Figures 27 to 32 are schematic front views showing the status of eight typical steps of the pipe laying method according to the second embodiment of the present invention, and Figures 33-1, 33-2, and 33-3 are schematic side views showing the status of eight typical steps of the pipe laying method according to the second embodiment of the present invention.

[0136] The pipe laying method according to the second embodiment can be carried out using the pipe laying device 70 according to the second embodiment. For the movable section 13, as with the pipe laying method according to the first embodiment, an electric trolley 14 is used at the front and plain trolleys 16 are used for the second and subsequent trolleys. In the pipe laying method according to the first embodiment and its modified versions (first and second modified versions), an upper horizontal portion 50B attached to the vertical portion 50C of an L-shaped bracket 50 is used as a member for installing the rail 12, and the rail 12 is attached to the lower surface of the upper horizontal portion 50B, thus requiring the installation of a new member for installing the rail 12. However, in the pipe laying method according to the second embodiment, the rail 12 is attached to the lower flange of the side longitudinal girder 116 of the bridge 110 along the direction in which the side longitudinal girder 116 extends, eliminating the need to install a new member for installing the rail 12.

[0137] On the other hand, in the pipe laying method according to the first embodiment and its modified versions (first and second modified versions), the pipe 22 sent out to the target point is lowered onto the lower horizontal portion 50A of the L-shaped bracket 50 installed before the rail 12 is installed and the pipe 22 is placed there. However, in the pipe laying method according to the second embodiment, at the time the rail 12 is installed and the sending out of the pipe 22 is made possible, there is no member for lowering and placing the pipe 22 that has been sent out to the target point. For this reason, after the sending out of the pipe 22 to the target point is completed, it is necessary to attach a support member for lowering and placing the pipe 22 to the bridge 110. In the pipe laying method according to the second embodiment, an L-shaped bracket 74 (see Figures 25, 30, 31, 32, and 33-3) is attached to the side longitudinal girder 116 as such a support member, but if the rail 12 is left attached to the side longitudinal girder 116, the L-shaped bracket 74 to be attached and the rail 12 will interfere with each other. Therefore, the rail 12 at the point where the L-shaped bracket 74 is to be placed is removed, and then the L-shaped bracket 74 is attached to the side longitudinal girder 116.

[0138] In this case, the rail 12 supporting the movable part 13 from which the pipe 22 is suspended cannot be removed. This is because the movable part 13 from which the pipe 22 is suspended would also be removed along with the rail 12. Therefore, the placement position of the movable part 13 is determined so that it is not placed on the rail 12 located at the point where the L-shaped bracket 74 is to be placed, and the rail 12 at the point where the L-shaped bracket 74 is to be placed is shortened to reduce the impact on the placement plan of the movable part 13.

[0139] Based on these considerations, a typical process of the pipe laying method according to the second embodiment of the present invention will now be described. As shown in the flowchart of Figure 26, the pipe laying method according to the second embodiment of the present invention has eight main steps, from steps S31 to S38. As mentioned above, for the moving section 13, similar to the pipe laying method according to the first embodiment, an electric trolley 14 is used at the front and plain trolleys 16 are used for the second and subsequent trolleys.

[0140] (Step S31) In the pipe laying method according to the second embodiment of the present invention, in step S31, a temporary stage scaffolding 80 is first installed on the launching side below the side longitudinal girder 116 of the bridge 110, as shown in the front view of Figure 27 and the side view of Figure 33-1(A). Here, it is assumed that a ground-assembled scaffolding (not shown) already exists on the arrival side.

[0141] (Step S32) Step S32 is the process of installing the rails 12. Using a bridge inspection vehicle (not shown), the rails 12 are attached to the underside of the side longitudinal girders 116 of the bridge 110 with fixing members 72, along the direction in which the side longitudinal girders 116 extend. If the point where the rails 12 are to be installed is in a planar curve area of ​​the bridge 110, the rails 12 are installed to correspond to that planar curve. The bridge inspection vehicle used is one that can provide a work platform that enables work on the underside and side of the superstructure of the bridge 110. If an aerial work platform can be positioned below the bridge 110, the aerial work platform may be used instead of the bridge inspection vehicle to install the rails 12. The state after the rails 12 have been installed in step S32 is schematically shown in the front view of Figure 28 and the side view of Figure 33-1(B).

[0142] (Step S33) Step S33 is the process of setting the leading electric trolley 14 and the following plain trolley 16 on the rail 12 on the temporary stage scaffolding 80 and sending out the leading pipe 22. The situation in which step S33 is being carried out is schematically shown in the front view of Figure 29 and the side view of Figure 33-2(C). The side view of Figure 33-2(C) is drawn assuming that the leading pipe 22 is a connecting pipe formed by linking two pipes 22. Note that in the front view of Figure 29, the plain trolleys 16, which are the second trolleys from the front, are drawn as moving parts, but if the leading trolley is drawn as a moving part, the electric trolley 14 will be drawn.

[0143] In step S33, the leading pipe 22 is first suspended from the leading electric trolley 14 and the plain trolley 16 behind it by the suspension parts 17 (lever block 18 and sling belt 20), and the electric trolley 14 is made to move under its own power to feed out the leading pipe 22 along the rail 12. The leading pipe 22 may be a single pipe 22, or it may be a jointed pipe made by connecting multiple pipes 22 in advance. In the side view of Figure 33-2(C), the leading pipe 22 is depicted assuming that it is a jointed pipe made by connecting two pipes 22. When feeding out the leading pipe 22, the tip end of the leading pipe 22 is suspended from the electric trolley 14 by the suspension parts 17, and the rear end is suspended from the plain trolley 16 by the suspension parts 17, and then fed out.

[0144] (Step S34) Step S34 involves connecting a subsequent pipe 22 to a previously sent-out pipe 22 (leading pipe) on the temporary stage scaffolding 80 on the sending-out side to form a pipe connector 23, and then suspending the subsequent pipe 22 from a plain trolley 16 using a suspension section 17 (lever block 18 and sling belt 20), while the electric trolley 14 is driven to send out the pipe connector 23 along the rail 12. The pipe connector 23 is a pipe formed by connecting a subsequent pipe 22 to a previously sent-out pipe 22 (leading pipe). The situation in which Step S34 is being carried out is schematically shown in the front view of Figure 29 and the side view of Figure 33-2(D). Note that the front view of Figure 29 is the same as the drawing used in the explanation of Step S33.

[0145] In step S34, the subsequent pipe 22 is connected to the previously fed pipe 22 to form a pipe connector 23, and each time the subsequent pipe 22 is suspended from the plain trolley 16 by the suspension part 17, the electric trolley 14 is made to move on its own to feed the pipe 22 (pipe connector 23) along the rail 12. The connection of the subsequent pipe 22 to the preceding pipe is performed, for example, on a work platform 82 with a lifting function, and the pipes 22 are connected to each other by welding or the like.

[0146] If the target location for laying the pipe 22 is within the planar curve area of ​​the bridge 110, the ends of the pipes 22 are cut to match the planar curve and then joined together by welding or other means. In this case, it is preferable to pre-cut the ends of the pipes 22 at an angle to match the required cutting angle.

[0147] As described in the explanation of step S32 above, when the point where the rail 12 is installed is in a planar curved area of ​​the bridge 110, the rail 12 is installed to correspond to that planar curve. Since the electric trolley 14 and plain trolley 16, which suspend the pipe 22, move along the rail 12, the pipe 22 can move without interfering with other members even if there is a planar curved area in the bridge 110.

[0148] The leading pipe 22 initially sent out in step S33 and the subsequent pipe 22 in step S34 (the pipe 22 to be sent out to be connected to the previously sent-out pipe 22 (leading pipe)) may be a single pipe 22, or a joint pipe formed by connecting multiple pipes 22 in advance. When a joint pipe formed by connecting multiple pipes 22 in advance is sent out by connecting it to the previously sent-out pipe 22 (leading pipe), it may be necessary to enlarge the area of ​​the temporary stage scaffolding 80 on the sending side. However, when a connection method that takes a certain amount of time, such as welding, is adopted, the efficiency of laying the pipes 22 can be improved in the construction of laying the pipes 22 by preparing a joint pipe formed by connecting multiple pipes 22 in advance and sending out this joint pipe by connecting it to the previously sent-out pipe 22 (leading pipe). Furthermore, in both cases—whether using a connecting pipe as the leading pipe 22 or as a subsequent pipe 22—the usable connecting pipes are not limited to those in which pipes 22 are connected in a straight line. For example, connecting pipes in which pipes 22 are bent to correspond to the curved sections of the bridge can also be used.

[0149] (Step S35) In step S35, all pipes 22 to be sent out are connected and sent out, and it is determined whether all pipes 22 have reached the target point and whether the sending out of all pipes 22 has been completed. If the sending out of all pipes 22 has not been completed, the process returns to step S34 and steps S34 are repeated.

[0150] Once all pipes 22 have been fed out, proceed to the next step, S36. The state immediately before proceeding to the next step, S36 (the state after all pipes 22 have been fed out) is schematically shown in the front view of Figure 29 and the side view of Figure 33-2(D). Note that the front view of Figure 29 is the same as the drawing used in the explanation of steps S33 and S34.

[0151] (Step S36) In step S36, using a bridge inspection vehicle (not shown) similar to the one used in step S32, the rails 12 in the area where the plain trolley 16 with the pipe 22 suspended is not located are removed in advance, and the L-shaped bracket 74 for pipe support is attached to the lower flange of the side longitudinal girder 116 with the mounting member 74X, thereby installing the L-shaped bracket 74 for pipe support on the bridge 110. The state after the L-shaped bracket 74 for pipe support has been installed in the predetermined position in step S36 is schematically shown in the front view of Figure 30 and the side view of Figure 33-3(E).

[0152] As shown in Figures 25 and 30, the upper end of the vertical portion 74B of the L-shaped bracket 74 is attached to the lower flange of the side longitudinal girder 116 by the mounting member 74X, and the L-shaped bracket 74 is installed on the bridge 110. The vertical portion 74B is bent slightly above the center (bend 74C) so as to curve inward in the width direction of the bridge 110, and the lower horizontal portion 74A on which the pipe 22 is placed is located almost directly below the side longitudinal girder 116. Furthermore, the entire L-shaped bracket 74 does not protrude to the outside of the side of the bridge 110, and its shape makes it easy to accommodate situations where there is limited space near the side of the bridge 110 (for example, when there are buildings or other structures near the side of the bridge 110).

[0153] (Step S37) In step S37, a bridge inspection vehicle (not shown) is used to install the pipe support base 46 on the lower horizontal portion 74A of the L-shaped bracket 74, and the pipe 22 is lowered onto the pipe support base 46 using a lever block 18. The bridge inspection vehicle used is the same as the bridge inspection vehicle used in step S32, and is capable of providing a work platform that enables work on the underside and side sides of the superstructure of the bridge 110. If an aerial work platform can be positioned below the bridge 110, the above work may be performed using the aerial work platform instead of the bridge inspection vehicle. When lowering, the pipes 22 are lowered sequentially, starting with the end pipe 22 of the connected pipes 22. The situation in which step S37 is being carried out is schematically shown in the front view of Figure 31 and the side view of Figure 33-3(E). Note that in the front view of Figure 31 and the side view of Figure 33-3(E), the pipes 22 are depicted in their position before being lowered. Furthermore, because it is difficult to illustrate, the pipe support 46 is not shown in the side view of Figure 33-3(E). For this reason, the side view of Figure 33-3(E) is the same as the drawing used in the explanation of step S36.

[0154] (Step S38) Once the lowering of the pipe 22 in step S37 is complete, the U-bolt 48 is positioned along the circumference of the pipe 22 to press down from above, and the lower end of the U-bolt 48 is fastened with a nut 48A to complete the laying of the pipe 22 to the target laying position. After the laying of the pipe 22 to the target laying position is complete, the electric trolley 14, the plain trolley 16, the remaining rails 12, and the temporary stage scaffolding 80 are removed. The state after the completion of step S37, when the laying of the pipe 22 to the target laying position and the removal of materials and equipment are complete, is schematically shown in the front view of Figure 32 and the side view of Figure 33-3(F).

[0155] As described above, in the pipe laying method according to this second embodiment, the pipe 22 is laid by feeding it along the rail 12 attached to the lower flange of the side longitudinal girder 116 of the bridge 110. When attaching the rail 12 to the side longitudinal girder 116, and when installing the L-shaped bracket 74 and pipe support base 46, and when performing the operations necessary to lower the pipe 22 to the laying position, a bridge inspection vehicle or aerial work platform can be used, eliminating the need for temporary scaffolding. By using the pipe laying method according to this second embodiment, the area of ​​temporary scaffolding required when laying the pipe 22 can be significantly reduced.

[0156] (2-3) Modified example of pipe laying method according to the second embodiment The pipe laying method according to the second embodiment can be carried out using the pipe laying device 70 according to the second embodiment. In addition, regarding the moving section 13, as in the pipe laying method according to the first embodiment, an electric trolley 14 is used at the front and plain trolleys 16 are used for the second and subsequent trolleys. However, as in the first modified example of the pipe laying method according to the first embodiment, plain trolleys 16 may be used for all the trolleys as the moving section 13, and the connected pipes 22 may be pushed along the rail 12 and fed along the rail 12 (first modified example of the pipe laying method according to the second embodiment). Alternatively, as in the second modified example of the pipe laying method according to the first embodiment, plain trolleys may be used for all the trolleys as the moving section 13, and the leading trailing plain trolley 26 of the trailing plain trolleys 26 that suspends the pipes 22 may be pulled along the rail 12 by a wire rope 30 to feed the connected pipes 22 along the rail 12 (second modified example of the pipe laying method according to the second embodiment).

[0157] (2-4) Modification of the support part In the pipe laying method according to the second embodiment described above, an L-shaped bracket 74 was used as a member that serves as a support on which the pipe 22 to be laid is ultimately placed. However, the form of the support on which the pipe 22 is ultimately placed is not limited to the form of the L-shaped bracket 74, and various forms can be adopted. One example of such a form will be described below.

[0158] Figure 34 shows a modified example (L-shaped bracket 76) of a support that can be used in the pipe laying method according to the second embodiment. Figure 34(A) is a front view showing the state in which the pipe 22 is being fed out, and Figure 34(B) is a front view showing the state in which the laying of the pipe 22 is completed.

[0159] As shown in Figure 34, the upper end of the vertical portion 76B of the L-shaped bracket 76 is attached to the lower flange of the side longitudinal girder 116 by the mounting member 76X, and the L-shaped bracket 76 is installed on the bridge 110. The vertical portion 76B is bent slightly above the center (bend 76C) so as to protrude outward in the width direction of the bridge 110, and the lower horizontal portion 76A on which the pipe 22 is placed is located almost directly below the side longitudinal girder 116. Furthermore, most of the L-shaped bracket 76 does not extend inward in the width direction of the bridge 110 beyond the side longitudinal girder 116, making it a shape that is easy to use when there is limited space below the bridge 110.

[0160] (2-5) Supplementary information on the support parts In the pipe laying method according to the second embodiment, an L-shaped bracket 74 is used as the support part on which the pipe 22 to be laid is ultimately placed. As a modified example, an L-shaped bracket 76 is shown in Figure 34. Both the L-shaped brackets 74 and 76 are attached to the lower flange of the side longitudinal girder 116. It is necessary to first remove the rails 12 in the area where the plain trolley 16 suspending the pipe 22 is not located, then attach the L-shaped brackets 74 and 76 for pipe support to the lower flange of the side longitudinal girder 116 with mounting members 74X and 76X, and install the L-shaped brackets 74 and 76 for pipe support on the bridge 110. This was explained in step S36 for the L-shaped bracket 74, and the same applies to the L-shaped bracket 76.

[0161] However, in the pipe laying method according to the second embodiment, it is not essential that the support portion of the pipe 22 (the support portion on which the laid pipe 22 will ultimately be placed) be attached to the side longitudinal girder 116. For example, it may be attached to the side of the curb portion 118 if possible (for example, an L-shaped bracket 50 used in the first embodiment). If the support portion of the pipe 22 (the support portion on which the laid pipe 22 will ultimately be placed) can be attached to the side of the curb portion 118, it becomes unnecessary to remove the rails 12 in the area where the plain trolley 16 suspending the pipe 22 is not located in advance, thus simplifying the process.

[0162] (3) Common supplementary information for the first and second embodiments The joints used to connect the pipes 22 are not particularly limited and may be any type of joint, such as welded joints, threaded joints, slip-on joints, and flanged joints. In both the first and second embodiments, the pipes 22 are suspended from the movable part 13 by the suspension part 17, so flanged joints can also be used.

[0163] Furthermore, in the pipe laying method according to the first embodiment and its modified versions (first modified version, second modified version), the pipe 22 was laid along the direction in which the bridge 100 extends (bridge axis direction), but the direction in which the pipe 22 is laid relative to the bridge 100 is not particularly limited. The present invention can be suitably used when laying pipes along the direction in which the bridge extends (bridge axis direction), but it can also be used, for example, when laying pipes along the width direction of the bridge. The present invention is particularly easy to use when laying pipes along the outer surface of the bridge (the surface of the part facing outward).

[0164] Furthermore, although the cross-sectional shape of the rail 12 is depicted as H-shaped in the drawings used to describe the first and second embodiments, the cross-sectional shape of the rail 12 is not limited to H-shape.

[0165] Furthermore, in the pipe laying method according to the first embodiment and its modified versions (first modified version, second modified version), temporary stage scaffolding 40 and 42 were used as temporary scaffolding, and in the pipe laying method according to the second embodiment and its modified versions (first modified version, second modified version), temporary stage scaffolding 80 was used as temporary scaffolding. However, the temporary scaffolding used when implementing the first and second embodiments is not limited to stage scaffolding erected from the ground, and suspended scaffolding may also be used. [Explanation of symbols]

[0166] 10, 70…Pipe laying equipment 12... Rails 12A... Rail mounting plate 12B...Spacer 13…Moving parts 14…Electric trolley 16…Plain Trolley 17... Hanging part 18... Lever block 18A...Lower hook 18B... Upper hook 20... Sling belt 22, 300…tube 23...Pipe connection body 24…Prior Plain Trolley 26... Rear plain trolley 30… Wire rope 32…Wire guide mechanism 34…Wire support 34A…Locking through hole 36... Shackle 38…Connecting bolts 38A... Nut 40, 42, 80... Temporary stage scaffolding 44...Winch 46... Pipe support 48…U-bolt 48A... Nut 50, 52, 54, 56, 58, 66, 74, 76… L-shaped brackets 50A, 52A, 54A, 56A, 58A, 60A, 62A, 66A, 74A, 76A...Lower horizontal part 50B, 52B, 54B, 56B, 58B, 60B, 62B, 64B...Top horizontal part 50C, 52C, 54C, 56C, 58C, 60C, 62C, 66C, 74B, 76B... Vertical parts 50Z, 52Z, 54Z, 56Z, 58Z, 60Z, 66Z… Mounting plate 54D, 56D, 74C, 76C...Bending part 58D…Protrusion 60, 62... Rectangular brackets 64…Brace bracket 64A…Stone 64B1…One end 64B2...other end 72… Fixing components 74X, 76X… Mounting parts 82...Workbench 100, 110, 150... bridges 102, 118...ground covering part 104... railing 106...Superstructure 112... Box girders 114...Bridge bracket 116...Side longitudinal girder 200... Temporary scaffolding 202... Single pipe 204…Safety Net

Claims

1. A method for laying pipes on a bridge, The rail installation process involves attaching rails to the aforementioned bridge, A step of attaching a movable part to the rail, which moves along the rail, A pipe suspension step in which a pipe is suspended from the movable part attached to the rail, A pipe feeding process in which the pipe suspended in the pipe suspension process is fed along the rail, A pipe connection step is performed in which a subsequent pipe is connected to the pipe that was sent out in the pipe feeding step, It has, A pipe laying method characterized in that, in the pipe suspension step, at least the tip of the pipe is suspended from the movable part.

2. Of the movable parts to be attached in the aforementioned movable part attachment process, the movable part at the front in the direction of travel shall be a self-propelled movable part having a self-propelled function. The pipe laying method according to claim 1, characterized in that the pipe is fed along the rail by making the self-propelled moving part move along the rail in the pipe feeding step.

3. The movable part to be attached in the aforementioned movable part attachment process shall be a driven movable part. The pipe laying method according to claim 1, characterized in that the pipe is fed along the rail by pushing the pipe along the rail in the pipe feeding step.

4. The aforementioned bridge has a straight shape when viewed from above. The movable part to be attached in the aforementioned movable part attachment process is a driven movable part, and a wire rope is attached to the leading movable part in the direction of travel. The pipe laying method according to claim 1, characterized in that the pipe is fed along the rail by pulling the wire rope along the rail in the pipe feeding step.

5. In the moving part installation process, multiple moving parts are attached to the rail, all of which are driven moving parts, and of the multiple moving parts, the leading moving part located at the front in the direction of travel does not suspend the pipe, while the trailing moving part located at the rear in the direction of travel suspends the pipe, and a wire rope is attached to the trailing moving part, which is the leading moving part in the direction of travel, and a guide mechanism is attached to the leading moving part that is connected to the wire rope and guides the wire rope along the rail. The pipe laying method according to claim 1, characterized in that the pipe is fed along the rail by pulling the wire rope along the rail in the pipe feeding step.

6. In the aforementioned moving part mounting process, multiple moving parts are attached to the rail, and of these multiple moving parts, the moving part at the front in the direction of travel is a self-propelled moving part having a self-propelled function, and the other moving parts are driven moving parts. The pipe laying method according to claim 1, characterized in that, in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the driven moving part, the self-propelled moving part is made to move along the rail, thereby feeding the pipe along the rail.

7. In the aforementioned moving part mounting step, multiple moving parts are attached to the rail, and each of these multiple moving parts is a driven moving part. The pipe laying method according to claim 1, characterized in that in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the movable part, the pipe is pushed along the rail, thereby feeding the pipe along the rail.

8. The aforementioned bridge has a straight shape when viewed from above. In the aforementioned moving part mounting process, multiple moving parts are attached to the rail, all of which are driven moving parts, and a wire rope is attached to the leading moving part in the direction of travel. The pipe laying method according to claim 1, characterized in that in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the movable part, the wire rope is pulled along the rail to feed the pipe along the rail.

9. In the moving part installation process, multiple moving parts are attached to the rail, all of which are driven moving parts, and of the multiple moving parts, the leading moving part located at the front in the direction of travel does not suspend the pipe, while the trailing moving part located at the rear in the direction of travel suspends the pipe, and a wire rope is attached to the trailing moving part, which is the leading moving part in the direction of travel, and a guide mechanism is attached to the leading moving part that is connected to the wire rope and guides the wire rope along the rail. The pipe laying method according to claim 1, characterized in that in the pipe feeding step, each time a subsequent pipe is connected to a pipe in the pipe connection step and the subsequent pipe is suspended from the trailing moving section, the wire rope is pulled along the rail to feed the pipe along the rail.

10. The pipe laying method according to any one of claims 1 to 9, characterized in that the pipe is laid along the bridge.

11. The pipe laying method according to any one of claims 1 to 9, further comprising a scaffolding installation step of providing scaffolding below the bridge for use when connecting pipes in the pipe connection step and when feeding out pipes in the pipe feeding step.

12. The pipe laying method according to any one of claims 1 to 9, characterized in that, in the pipe connection step, both pipes to be connected are straight pipes, and the angle between the straight pipes is a predetermined angle to correspond to the target laying position.

13. The pipe laying method according to any one of claims 2, 3, 5, 6, 7, or 9, characterized in that the bridge has a planar curved section that is curved when viewed from above, and the pipe laid in the planar curved section is connected to the adjacent pipe by adjusting the angle between the adjacent pipes in the pipe connection process so as to correspond to the planar curved section.

14. The pipe laying method according to any one of claims 1 to 9, characterized in that the pipes are connected to each other by welding in the pipe connection step.

15. After the pipe has been fed to the target position in the pipe feeding process, the process includes a pipe lowering process in which the pipe is lowered to a predetermined height position. The pipe laying method according to any one of claims 1 to 9, characterized in that the rail installation step involves installing the rail on the bridge so that it is located above the position where the pipe is to be laid.

16. The pipe laying method according to claim 15, characterized in that the rail to be attached to the bridge in the rail installation step is attached to the bridge via a support member.

17. The pipe laying method according to claim 16, characterized in that the support member is attached to the outer surface of the curb portion of the bridge.

18. The support member comprises two horizontal members extending horizontally with a predetermined difference in height, and the rail to be attached to the bridge in the rail installation process is attached to the horizontal member with the higher height among the two horizontal members. The pipe laying method according to claim 16, characterized in that, in the pipe lowering step, the pipe is lowered from the horizontal member that is at the lower of the two horizontal members.

19. The pipe laying method according to any one of claims 1 to 9, characterized in that the rail to be attached to the bridge in the rail installation step is attached to the girder member of the bridge along the longitudinal direction of the girder member.

20. The pipe laying method according to any one of claims 1 to 9, characterized in that when attaching rails to the bridge in the rail installation step, at least one of a bridge inspection vehicle and an aerial work platform is used.

21. A pipe laying device for laying pipes on a bridge, Rails and A first support part attached to the bridge and supporting the rail from above, A movable part that is attached to the rail and moves along the rail, A suspension part attached to the movable part for suspending the pipe, A second support portion is attached to the bridge so as to be located below the position of the rail supported by the first support portion, on which the pipe is placed, It has, The pipe laying device is characterized in that the movable part moves along the rail while the pipe is suspended.

22. The pipe laying device according to claim 21, characterized in that the first support portion is detachably attached to the bridge.

23. It has a third support portion that is attached to the bridge and supports the second support portion, The pipe laying device according to claim 21, characterized in that the first support portion is detachably attached to the third support portion.

24. The pipe laying device according to claim 23, characterized in that the third support portion is attached to the outer surface of the curb portion of the bridge.

25. A pipe laying device for laying pipes on a bridge, The girder members of the aforementioned bridge, A rail attached to the girder member, A movable part that is attached to the rail and moves along the rail, A suspension part attached to the movable part for suspending the pipe, It has, The pipe laying device is characterized in that the movable part moves along the rail while the pipe is suspended.

26. The pipe laying device according to any one of 21 to 25, characterized in that the suspension part can raise and lower the suspended pipe.

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