JP5195482B2 - Pipeline laying method - Google Patents

Description

  The present invention relates to a pipeline laying method for forming a plurality of pipelines by welding and connecting single pipes in a tunnel.

Regarding a method of laying a pipeline by continuously butting a large number of pipes in a tunnel in a tunnel, for example, the following description is given in the section of prior art in Patent Document 1.
“As a typical example of a conventional construction method in a narrow field, a construction method for piping work in a tunnel will be described. This example is for a pipe diameter of 900A and a tunnel diameter of 2,400 mm.
The fixed pipe 2 laid in the narrow tunnel 1 and the joint pipe 3 are welded to each other by a pipe circumferential automatic welding device 20. Further, following the current welding operation, the pipe 4 to be connected next is set by the inner clamp device 6 so that the seam gap and the pipe are aligned. Further, the succeeding joint pipe 5 is mounted on the carriage 7 and is conveyed on the rail 8 toward the laying position. "

Although not clearly shown in the description of Patent Document 1 above, as a method of laying a pipeline by continuously butting a large number of single pipes in a narrow place in a tunnel in the axial direction, It is done as follows.
A carriage is run on a track laid during the construction of the shield tunnel, and a single pipe having a predetermined length (for example, 9 m) is placed on the carriage and carried into the tunnel. And it mounts in a tunnel so that it may become a straight line in an axial direction sequentially. When a predetermined number of, for example, three single tubes are carried in, they are lifted by a crane installed in the tunnel, and butt-welded in the axial direction and connected. The connected single tubes are placed on a predetermined mount. By repeating such operations, a single pipe is sequentially connected to the tunnel entrance side to form a pipeline.

JP-A-9-253842

The above-described conventional pipeline laying method is a method of laying a single pipeline, and there are the following problems when attempting to lay two pipelines in a narrow tunnel space by such a method.
As explained in the above-mentioned one-line pipeline laying, the first pipeline runs the carriage on the rail used in the construction of the shield tunnel, carries a single pipe with this carriage, and this is axially It can be performed by welding to.
However, since the rail is blocked by the laying of the first pipeline, the single tube of the second strip cannot even be carried in by the carriage.

  In order to prevent the rail for traveling on the carriage from being blocked by the first pipeline, if the first pipeline is welded at a location near the tunnel inner wall that is off the rail, the welding There is a problem that the welding operation cannot be performed due to insufficient space.

  Thus, in the conventional method of laying a pipeline by sequentially butting a single pipe in a narrow place such as in a tunnel, it is only considered to lay a single pipeline. The pipeline could not be laid.

  The present invention has been made to solve such a problem, and in a method for laying a pipeline by sequentially butting pipes in a tunnel, a method for laying two pipelines, and a mount used in the method are provided. It is intended to provide.

As described above, the conventional pipeline laying method can only lay a single pipeline in a narrow space inside the shield tunnel. Therefore, the inventor has completed any problems to make it possible to lay two pipelines in such a narrow space, and intensively studied how to solve the problems.
In the following, the problems associated with the laying of the two pipelines will be described, and what measures have been taken to solve the problems will be described in detail.

(1-1) First problem First, as a first problem, when the first pipeline is laid, in the conventional method, the existing track becomes unusable by the first pipeline laid, In this state, the carriage cannot be carried on the existing track and the single pipe for the second pipeline cannot be carried by the carriage.
(1-2) Concept of the first problem solving means The rail laid during the construction of the shield tunnel is mainly for traveling a truck for carrying out sediment, and a wide rail is laid. .
Therefore, it was thought that it was difficult to solve the above problem by making use of this rail as it was, and how to solve the above problem while utilizing the existing rail as much as possible was considered.
Then, using one of the two existing rails laid in parallel, the other rail can be moved to the inner wall on one side of the tunnel with a rail width that allows pipe conveyance. I thought. In other words, instead of using the existing rail as it is, the pipe mounting position of the first strip that has been carried We considered securing the formation place of the first line pipeline in a place other than the rail.

(2-1) Second problem Since a predetermined welding space is required to weld the first pipe of the first tube in the axial direction, considering that the tunnel is a narrow space, it is said that the welding space is secured. From the point of view, it is necessary to weld the first single tube near the center of the tunnel.
However, if the first line is formed near the center of the tunnel, the formed first line will be in the way, and work for laying the second line, that is, carrying a single pipe, welding a single pipe, etc. The second problem is that the above work cannot be performed.

(2-2) Concept of solution to the second problem Welding work for a single pipe for forming the first line of the pipeline near the center of the tunnel, and moving the formed first line of the pipeline toward the inner wall of the tunnel By doing so, it was considered to secure a work space for laying the second pipeline, that is, carrying a single pipe and welding a single pipe.

  The present invention described below has been made based on one or both of the above-mentioned “concepts of the solving means”, and specifically includes the following embodiments.

(1) The pipeline laying method according to the first embodiment of the present invention is a pipeline laying method in which a plurality of pipelines are formed in the tunnel by connecting the single pipes carried into the tunnel by welding. A pipeline forming step of forming a pipeline in a place other than the carriage traveling rail installed in the tunnel, a pipeline moving step of moving the formed pipeline toward the tunnel wall, and the pipeline And a side-by-side pipeline forming step of forming a pipeline so as to be side by side with the already formed pipeline after the moving step.

(2) The pipeline laying method according to the second aspect of the present invention is the one described in (1) above, with respect to the pipeline formed by the side-by-side pipeline formation step after the side-by-side pipeline formation step. A pipeline moving process is performed, and a pipeline forming process is further performed to form three or more pipelines.

(3) The pipeline laying method according to the third aspect of the present invention is the one described in (1) or (2) above, wherein the pipeline forming step is a platform for placing the formed pipeline. A pedestal forming step, a welding step of welding and connecting a plurality of single pipes in the axial direction, and a placing step of placing the welded pipeline on the pedestal. It is.

(4) The pipeline laying method according to the fourth aspect of the present invention is the method according to any one of the above (1) to (3), wherein the side-by-side pipeline formation step places the formed pipeline. A pedestal forming step for forming a pedestal for welding, a welding step for welding and connecting a plurality of single pipes in the axial direction, and a placing step for placing the welded pipeline on the pedestal. It is a feature.

(5) The pipeline laying method according to the fifth aspect of the present invention is the method according to the above (3) or (4), wherein the gantry forming step includes running a carriage on an existing rail in the tunnel. The material carrying-in process of carrying in the material of the gantry by the carriage, and the rail closer to the tunnel inner wall of the existing rails of the rail is moved to the opposite side across the other rail, and from the existing rail width Includes a rail forming step for forming a new narrow rail.

(6) The pipeline laying method according to the sixth aspect of the present invention is the method according to any one of the above (3) to (5), wherein the gantry includes a leg portion and a tunnel supported by the leg portion. It is characterized by comprising a rail part extending in the radial direction, and a moving base movable on the rail part along the rail part.

(7) The pipeline laying method according to the seventh aspect of the present invention is the one described in (6) above, wherein the rail portion constituting the gantry is configured to be divided into two in the tunnel radial direction. It is characterized by.

(8) The pipeline laying method according to the eighth aspect of the present invention is the method according to any one of the above (3) to (7), wherein the pipeline moving process includes a plurality of pipes installed in the tunnel axial direction. It has a forcible moving step of forcibly moving the pipeline placed on the gantry by a predetermined distance at each gantry position so that the moving distance on the tip side becomes long.

(9) The pipeline laying method according to the ninth aspect of the present invention is the method described in (8) above, wherein the forcible moving step is a set of a plurality of platforms selected in order from the front end side of the pipeline. The forcible movement is performed for each set of the gantry, and the forcible movement is performed so that the pipeline does not move in the gantry on the rear end side with respect to the selected gantry.

(10) A pipeline placement moving platform according to a tenth aspect of the present invention is a pipeline placement movement used in a pipeline laying method in which a single pipe is connected by welding in a tunnel to form a plurality of pipelines. A pedestal comprising: a leg portion; a rail portion supported by the leg portion and extending in a tunnel radial direction; and a movable stand that is movable along the rail and on which the pipeline can be placed on the rail portion. It is characterized by that.

(11) In the pipeline mounting mobile gantry according to the eleventh aspect of the present invention, the rail portion constituting the gantry is configured to be divided into two in the tunnel radial direction in the above (10). It is characterized by being.

  In the present invention, a pipeline forming step of forming a pipeline in a place other than the carriage traveling rail laid in the tunnel, a pipeline moving step of moving the formed pipeline in the direction of the tunnel wall, After the pipeline moving process, a plurality of pipelines are formed even in a narrow tunnel space by including a pipeline forming process for forming a pipeline so as to be installed alongside the already formed pipeline. be able to.

It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 1). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 2). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 3). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 4). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 5). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 6). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 7). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 8). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 9). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 10). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 11). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 12). It is explanatory drawing of the pipeline laying method in one embodiment of this invention (the 13). It is explanatory drawing of the pipeline laying method which is other embodiment of this invention. It is explanatory drawing of the pipeline laying method which is other embodiment of this invention.

[Embodiment 1]
First, the pipeline laying method according to the present embodiment will be outlined. The pipeline laying method according to the present embodiment is formed by forming the first line pipeline at a place other than the rail where the carriage travels. A process, a pipeline moving process for moving the formed first pipeline in the direction of the tunnel wall, and a second pipeline forming process for forming the second pipeline.
The first line pipeline forming process includes a frame forming process for forming a frame on which the first line pipeline is placed, a single pipe carrying-in process for carrying a single pipe into the tunnel, and a single pipe that has been loaded. A welding process of butting in the direction and welding and a mounting process of mounting the welded single pipe on the gantry are included.
Furthermore, in the gantry forming process, a single material pipe is installed in the shield tunnel, which is carried out in parallel with the gantry material carrying-in process for carrying the material for forming the gantry into the tunnel, and the gantry material carrying-in process. There are included a rail refilling process for changing to rails used for carrying carts for carrying-in, and a gantry assembling and installing process for assembling and installing the gantry using the gantry materials carried in the gantry material carrying-in process.
The first line pipeline forming process in the present embodiment corresponds to the pipeline forming process of the present invention, and the second line pipeline forming process in the present embodiment corresponds to the side-by-side pipeline forming process of the present invention. To do.

The above description is an explanation of the pipeline laying method according to the present embodiment in order from the higher concept, but when the steps constituting the pipeline laying method according to the present embodiment are arranged in time series and arranged. It becomes as follows.
Rails used to mount the platform material to form the platform on which the first pipeline is placed into the tunnel, and to use the existing rails laid in the shield tunnel for single-carriage cart travel The rail refilling process, the rack assembly and installation process for assembling and mounting the rack using the rack material loaded in the rack material loading process, the single pipe loading process for loading a single pipe into the tunnel, Welding process for welding the pipes in the axial direction, mounting process for placing the welded single pipe on the gantry, and pipeline movement for moving the formed first line pipeline to the inner wall side on one side of the tunnel A process and a second line pipeline forming process for forming a second line pipeline.
FIGS. 1-13 is explanatory drawing of the pipeline laying method which concerns on one embodiment of this invention, and demonstrates this method in time series. Hereafter, each process of this Embodiment is demonstrated in detail, referring FIGS.

1. Fig. 1 is an explanatory view showing a state in the tunnel before construction, in which Fig. 1 (a) shows a cross section perpendicular to the tunnel axis direction, and Fig. 1 (b) shows Fig. 1 (a). The arrow AA sectional view is shown.
As shown in FIG. 1, in the state before construction, a wide existing rail 3 made of two existing rails 3a and 3b extending in parallel and laid in the tunnel axis direction is installed in the shield tunnel 1.
In the frame material carrying-in step, as shown in FIG. 2, the vehicle 5 is moved on the existing rail 3, and the frame material 7 for forming the frame 12 on which the first pipeline is placed by the vehicle 5 is used. Carry it into the tunnel and place it in place.
In this example, since the gantry 12 is installed every 18 m in the tunnel axis direction, materials necessary to form each gantry 12 are placed in the tunnel at every interval.

2. Rail refilling step The rail refilling step is a step of refilling the existing rail 3 laid in the shield tunnel 1 into a narrow new rail 9 used for running a carriage for carrying a single pipe.
3A and 3B are explanatory diagrams for explaining the rail refilling process, in which FIG. 3A shows a cross section perpendicular to the tunnel axis direction, and FIG. 3B is a view taken along the line B-B in FIG. A line sectional view is shown.
Note that the rail refilling process and the frame material carrying-in process proceed simultaneously. Hereinafter, these steps will be described with reference to FIG.

As described above, the gantry material 7 is carried in by the cart 5 traveling on the existing rail 3, and placed in a predetermined place in order from the back of the tunnel. Since there is no need for the carriage 5 to travel thereafter on the place where the mount material 7 is placed, the central rail 3b of the two existing rails 3a and 3b is left as it is, and the rail 3a ( The left rail 3a) is removed. And the removed rail 3a is installed in the other side of the center rail 3b, and the new installation rail 9 which makes the single tube conveyance trolley 25 for carrying in the single tube for pipeline formation etc. newly form is formed. The width of the newly installed rail 9 for traveling of this single-pipe transport carriage 25 is set to be narrower than the width of the existing rail as shown in FIG.
In this example, the width W1 of the existing rail 3 before refilling was 610 mm, whereas the width W2 of the new rail 9 after refilling was 410 mm.
Thus, by newly forming a narrow new rail 9 for running the single-pipe transport carriage 25, a frame installation space can be secured on the left side of the tunnel as shown in FIG. 3B. At the same time, a narrow rail can be formed on the right side in the figure, and the single-pipe transport carriage 25 can travel. The new rail 9 mainly transports pipeline forming materials and welding equipment.

3. Mount assembly installation process The mount assembly installation process is a process of assembling and installing the mount 12 using the mount material 7 carried in the mount material carrying-in process. In this step, as shown in FIG. 4, the work is performed by running the equipment 11 used for the gantry assembling work on the newly installed rail 9, so that an extremely efficient work is possible.
FIG. 4 shows the gantry 12 in a state after assembly. As shown in FIG. 4, the gantry 12 is provided with a leg portion 13, a rail portion 15 that is supported by the leg portion 13 and extends in the tunnel radial direction, and is movable on the rail portion 15 along the rail portion 15. The movable table 17 is provided. The movable table 17 is provided with a half-shaped support member 19 for supporting the single pipe. In order to make the movement of the movable table 17 smooth, the sliding surfaces of the movable table 17 and the rail portion 15 were processed with fluororesin.
The rail portion 15 can be divided into two in the axial direction, that is, the tunnel radial direction.
When installing the gantry 12, the leg portion 13 is erected on the tunnel ground 21, and one end of the rail portion 15 is fixed to the receiving portion 23 of the segment forming the inner wall of the tunnel.

In the assembled state, the gantry 12 is mounted with a single pipe or a pipeline connected with a single pipe on the movable table 17, and can move along the rail portion 15 together with the movable table 17 in the tunnel radial direction.
It should be noted that a pin for restricting the movement of the movable table 17 can be inserted into the rail portion 15, and by inserting this pin, the movable table 17 can be made movable or non-movable. It has become.
Further, a reaction force member (to be described later) for taking a reaction force of the jack 35 in a pipeline moving step to be described later can be installed at the end 15a on the tunnel center side in the rail portion 15.
When the assembly and installation of the gantry 12 is completed, a first pipeline is formed.

4). Single Pipe Carry-In Process As shown in FIG. 5, the single pipe carry-in process is performed by running a single-tube transport carriage 25 on the new rail 9 newly formed in the rail refilling process, and using this single-tube transport carriage 25. When the single tube 27 is loaded and a predetermined number (for example, three) is loaded, welding is performed by the following welding process.

5. Welding process
The single pipe 27 carried in using the single pipe transport carriage 25 is lifted by a lifting tool 29 installed in the tunnel, and the single pipes lifted are butted against each other in the axial direction. As shown in FIG. 6, this welding work is performed by an operator, but the single pipe 27 to be welded is disposed in the substantially central part of the tunnel, and ten parts of welding work space can be secured.
In this welding operation, since the new rail 9 is laid on the side of the single pipe 27 to be welded, the welding equipment 31 is conveyed using the new rail 9 as shown in FIG. Since work can be performed, very efficient work can be performed.
In this regard, with the conventional pipeline laying method, the rail is blocked by the single pipe 27 in the state where the single pipe 27 is carried in, so in the welding operation, it is close to the single pipe 27 for welding the welding equipment 31. It was necessary to rely on human power to bring it to the end, and it was necessary to extend the captive ear cable even during welding work.
Compared to this, in the present embodiment, since the welding equipment 31 can be transported to the immediate vicinity of the single pipe 27 to be welded, various work efficiencies associated with the welding work can be significantly improved.

6). Placement Step The placement step is a step of placing the welded single tube 27 on the movable table 17 on the gantry 12 as shown in FIG.
The single pipe carrying-in process, the welding process, and the placing process are repeated while moving toward the tunnel entrance side for each predetermined number of single pipes 27, thereby forming a first pipeline.

7). Pipeline moving process The pipeline moving process is a process of moving the formed first-line pipeline 33 to the inner wall side (left side in the figure) on one side of the tunnel.
In the pipeline moving process, the first-line pipeline 33 placed on the moving table 17 of the gantry 12 is gradually moved by a predetermined size sequentially from the tunnel back side.
Specifically:

When moving, the side portion of the first line pipeline 33 is pressed by the jack 35, so that the reaction force member 37 is installed at the tip of the rail portion 15 to take the reaction force of the jack 35 as shown in FIG. 8. To do.
FIG. 9 is an explanatory diagram of the pipeline moving process.
In the following description, the case where the first-line pipeline 33 is moved 400 mm in the direction of the tunnel inner wall from the mounting position during welding will be described as an example.
First, the first to sixth six mounts 12 are regarded as one set in order from the back of the tunnel, and are moved in units of the six sets.
The sixth base 12 is pin-fixed so that the movable base 17 does not move. Then, a reaction force member 37 is installed at the tip of the rail portion 15 of the first to fifth mounts 12. First, in the first mount 12, the side surface of the pipeline is taken by the jack 35 while taking the reaction force on the reaction force member 37. Press to force move. By pushing the side surface of the pipeline, the pipeline placed on the moving table 17 moves together with the moving table 17. At this time, the moving distance forcibly moved by the first gantry 12 is 80 mm, and the second to fifth gantry 12 is allowed to move freely.

  Next, the first and second frames 12 are forcibly moved by 80 mm by the jack 35, respectively. That is, the first frame 12 is forcibly moved 160 mm from the initial installation position, and the second frame 12 is forcibly moved so that the distance is 80 mm from the initial installation position. In the second gantry 12, when the first forcible movement is performed in the first gantry 12, the movement in the tunnel radial direction has already been performed with this movement. The forced movement distance is less than 80 mm. At this time, the third to fifth mounts 12 are allowed to move freely.

Next, the first, second, and third mounts 12 are each forcibly moved by 80 mm. At this time, the fourth and fifth mounts 12 are allowed to move freely.
Next, a forced movement of 80 mm is performed on each of the first to fourth mounts 12. At this time, the fifth frame 12 is left to move freely.
Next, the first to fifth mounts 12 are forcibly moved by 80 mm. As a result, the movement of 400 mm is performed at the first position, and the planned movement is completed. Then, the first moving table 17 is fixed with a pin so that the moving table 17 does not move toward the center of the tunnel.

The operator who was on the first pedestal 12 moved to the sixth pedestal 12, removed the fixing pin of the sixth movable pedestal 17, fixed the seventh movable pedestal 17, and then returned to the sixth pedestal 12. Responsible for forced movement on the sixth frame 12. In this way, the movement by 80 mm on the second to sixth gantry 12 is performed in the same manner as the movement on the first to fifth gantry 12 described above.
As described above, the first-line pipeline 33 is finally moved 400 mm toward the tunnel inner wall side over the entire length.

  As described above, in the present embodiment, since the movement of the first line pipeline 33 is gradually performed in units of a predetermined length, a safe and reliable movement of the pipeline can be realized.

  When the movement of the first line of the pipeline toward the inner wall of the tunnel is completed, the portion on the center side of the rail portion 15 in each frame 12 is removed. As a result, as shown in FIG. 10, a wide space can be secured at the center of the tunnel, and the second-line pipeline laying operation described later can be performed smoothly.

6). Second line pipeline forming process The second line pipeline forming process includes a process of carrying a predetermined number of single pipes 39 for the second thread pipeline by the single pipe transport carriage 25 (see FIG. 11), and a predetermined number of single pipes carried. 39 (see FIG. 12), hoisting 39 with a lifting tool 29 and welding in the axial direction, placing the welded single tube 39 on an EPS (Styrofoam) mount 41 (see FIG. 13), and placing the single tube 39 and a step of forming a second pipeline 40 by welding the newly introduced and welded single pipe 39.

This second-line pipeline forming step can be basically performed in the same manner as in the conventional one-line pipeline formation.
In this regard, even if an attempt was made to form a second pipeline by a conventional method, it was not possible to carry in even a single pipe used for forming the second pipeline. On the other hand, according to the present embodiment, the second pipeline can be formed in the same manner as the first pipeline.
In the formation of the second pipeline, the gantry 41 on which the welded pipe is placed does not need to move the placed pipe anymore, and is fixed using EPS (Styrofoam) as shown in FIG. A stand is used.
As described above, the second pipeline is sequentially formed toward the tunnel entrance side.

When the formation of the first and second pipelines 40 is completed, the construction is completed by injecting mortar into the tunnel.
As described above, according to the present embodiment, it is possible to form a two-line pipeline in a narrow tunnel space that was impossible in the past.

In the first embodiment described above, the case where two strips of pipelines are formed in a narrow tunnel space has been described. However, this technique can also be applied to the case where one strip of pipelines is formed.
In other words, in the conventional method for forming a single pipeline, a single pipe for the first pipeline is carried by a carriage and placed on a rail. For example, three carried single pipes are welded. When doing this, it is impossible to bring the welding equipment right next to the single pipe to be welded.
In this regard, as described in the first embodiment, the welding efficiency of the pipe can be improved if the rail is reshaped so that the single pipe can be placed by shifting from the rail of the carriage.

[Embodiment 2]
Moreover, in said Embodiment 1, in order to complete | finish work by forming the 2nd pipeline 40 after forming the 1st pipeline 33, it is an example which forms a 2 pipeline as a whole.
However, the present invention is not limited to this, and after the second line pipeline 40 is formed, a third line pipeline is formed, or a pipeline having more lines is formed. Also good.

FIG. 14 is a schematic diagram illustrating a construction completion state when, for example, a third-line pipeline 43 is formed. In this example, after forming the first line pipeline 33 as described in the above embodiment, the second line pipeline 40 is formed on the gantry 12 in the same manner as the first line pipeline forming step, and then the above-described implementation. In the same manner as the second-line pipeline forming process described in the above embodiment, the third-line pipeline 43 is formed on the EPS frame 41.
Further, in the example of FIG. 14, two pipelines are formed on the gantry 12, but when the diameter of the shield tunnel 1 is large, three or more pipelines are formed on the gantry 12. Also good.

Further, in the case of forming a pipeline of three or more lines, the example shown in FIG. 14 shows an example in which the gantry 12 is provided on one side of the shield tunnel 1, but the present invention is not limited to this, for example, FIG. As shown in FIG. 15, the gantry 12 is installed on both the left and right sides of the shield tunnel 1 to form a first pipeline 33 on the left gantry 12 in the figure, and a second pipeline 40 on the right gantry 12 in the figure. Further, a third thread pipeline 43 may be formed on the EPS frame 41 in the center of the shield tunnel 1.
In the example shown in FIG. 15, an example in which a single pipeline is formed on the gantry 12 formed on both sides is shown, but the case where the gantry 12 is installed on both sides of the shield tunnel 1 is also shown in FIG. 14. As shown in the example, a plurality of pipelines may be formed on the gantry 12.

DESCRIPTION OF SYMBOLS 1 Shield tunnel 3 Existing rails 3a, 3b Existing rails 5 Carts 7 Base materials 9 New rails 11 Equipment 12 Bases 13 Legs 15 Rails 17 Moving bases 19 Support members 21 Tunnel ground 33 Receiving parts 25 Single-pipe transport carts 27 Single pipes 29 Lifting tool 31 Welding equipment 33 First line pipeline 35 Jack 37 Reaction member 39 Single pipe 40 Second line pipeline 41 EPS mount 43 Third line pipeline

Claims (9)

A pipeline laying method for forming a plurality of pipelines in the tunnel by connecting and forming single pipes carried into the tunnel by welding,
A pipeline forming process for forming a pipeline in a place other than the carriage traveling rail installed in the tunnel, a pipeline moving process for moving the formed pipeline toward the tunnel wall, and a pipeline moving process. A pipeline laying method comprising: a pipeline forming step of forming a pipeline so as to be installed alongside a pipeline that has already been formed.   After the pipeline formation process, the pipeline movement process is performed on the pipeline formed by the pipeline formation process, and the pipeline formation process is further performed to form three or more pipelines. The pipeline laying method according to claim 1.   The pipeline forming step includes a pedestal forming step of forming a pedestal for mounting the formed pipeline, a welding step of welding and connecting a plurality of single pipes in the axial direction, and the welded pipeline as described above. The pipeline laying method according to claim 1, further comprising a mounting step of mounting on a gantry.   The side-by-side pipeline formation process includes a frame formation process for forming a frame for mounting the formed pipeline, a welding process for welding a plurality of single pipes in the axial direction, and a welded pipeline. A pipeline laying method according to any one of claims 1 to 3, further comprising a mounting step of mounting on the mount.   The gantry forming process includes a material carrying-in process in which a carriage is run on an existing rail in the tunnel and the material of the gantry is carried by the cart, and a rail closer to the inner wall of the tunnel among the rails of the existing rail. The pipeline laying method according to claim 3 or 4, further comprising a rail forming step of forming a new rail narrower than the existing rail width by moving to the opposite side across the other rail. .   The gantry includes a leg portion, a rail portion extending in the tunnel radial direction supported by the leg portion, and a movable base movable along the rail portion on the rail portion. The pipeline laying method according to any one of claims 3 to 5.   The pipeline laying method according to claim 6, wherein the rail portion constituting the gantry is configured to be divided into two in the tunnel radial direction.   The pipeline moving process is a forced moving process in which pipelines placed on a plurality of mounts installed in the tunnel axis direction are forcibly moved by a predetermined distance at each mount position so that the moving distance on the tip side becomes long. The pipeline laying method according to any one of claims 3 to 7, characterized by comprising: In the forcible moving process, a plurality of platforms selected in order from the front end side of the pipeline are set as a set, and the forcible movement is performed for each set of the platforms. In the platform on the rear end side than the selected platform, The pipeline laying method according to claim 8, wherein the forced movement is performed so that the pipeline does not move.

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