JP2021080751A - Tunnel structure, pipe insertion device to tunnel, and pipe insertion method - Google Patents

Abstract

To smoothly install pipes in a tunnel while efficiently connecting the pipes under a good working environment.SOLUTION: A tunnel structure comprises: a tunnel 1 including a first circular arc part 14 and a second circular arc part 15; pipes 20 curving along the first circular arc part 14 and the second circular arc part 15; and a plurality of rollers 30 supporting the pipes 20 on each of both of the first circular arc part 14 and the second circular arc part 15.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tunnel structure, a pipe insertion device into a tunnel, and a method of inserting a pipe.

Conventionally, for example, as described in Patent Document 1 below, when a pipeline such as a gas pipe or a water pipe is installed in an underground tunnel, after suspending a pipe having a predetermined length into a shaft, the pipe has a predetermined length. A configuration is known in which a pipe is transported from the bottom of a shaft to a predetermined position in a tunnel extending in the horizontal direction.

Japanese Patent No. 4012639

By the way, in the above-mentioned transport configuration, it is necessary to dig a large shaft in order to form a pipeline. The deeper the tunnel, the deeper the shaft needs to be dug, which increases the construction of the shaft and increases the cost.
In addition, it is necessary to weld and connect a plurality of pipes in the tunnel. For this purpose, it is necessary not only to weld the pipes to each other but also to inspect the welded portion and perform anticorrosion treatment of the welded portion in the tunnel. However, the working environment is poor in the tunnel, and the working efficiency tends to decrease. It also takes time to bring a large number of pipes into the tunnel.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to smoothly lay pipes in a tunnel while efficiently connecting pipes in a good working environment.

In order to solve the above problems, the present invention proposes the following means.
(1) The tunnel structure according to one aspect of the present invention is continuously inserted from a tunnel including a first arc portion and a second arc portion and one end of the tunnel, and the first arc portion and the tunnel structure. A pipe that bends along the second arc portion and a plurality of rollers that support the pipe in both the first arc portion and the second arc portion are provided.
(2) In the tunnel structure according to (1) above, the ratio of the arrow height, which is the distance between the chord connecting the position where the pipe starts to bend and the position where the pipe starts to bend in the first arc portion and the position where the pipe bends most, is The chord that is larger than the ratio of the arrow height of the first arc portion to the chord connecting the start point and the end point of the first arc portion and connects the position where the pipe starts to bend and the bending end position in the second arc portion, and the most. The ratio of the arrow height, which is the distance to the bending portion, may be larger than the ratio of the arrow height of the second arc portion to the chord connecting the start point and the end point of the second arc portion.
(3) In the tunnel structure according to (1) or (2), the roller may be fixed within the range of the first arc portion and the second arc portion in the extending direction of the tunnel.
(4) The pipe insertion device according to one aspect of the present invention is fixed to the tip of a pipe that is continuously inserted from one end of the tunnel, and has a carriage that allows the pipe to travel in the tunnel and a trolley of the tunnel. A first roller fixed inside and supporting the pipe is provided.
(5) In the pipe insertion device according to (4) above, the wheels provided on the carriage are positioned differently from the first roller along the circumferential direction of the tunnel, and the tip of the pipe is set. At the first roller position, the position may be higher than that of the first roller.
(6) The pipe insertion device according to (4) may include the carriage and a second roller fixed inside the tunnel to support the pipe.
(7) In the pipe insertion device according to (6) above, the wheels provided on the carriage are positioned differently from the second roller along the circumferential direction of the tunnel, and the tip of the pipe is set. At the second roller position, it may be arranged at a position higher than that of the second roller.
(8) The pipe insertion method according to one aspect of the present invention is a method of inserting a pipe into a tunnel using the pipe insertion device according to any one of (4) to (7) above, and the tunnel. In the first step, the pipe is supported by the first roller while the pipe is driven by the carriage, whereby the pipe is supported by the first roller. The first arc portion is passed while being elastically deformed along the first arc portion.
(9) In the pipe insertion method according to (8) above, the pipe to which the trolley is attached is run in the tunnel, and the pipe is passed from the deepest portion through the second arc portion of the tunnel to the first part of the tunnel. The second step of inserting the pipe into the two slope portions is provided, and in the second step, the pipe is supported by the second roller while the pipe is driven by the carriage, so that the pipe is supported along the second arc portion. The second arc portion may be passed through while being elastically deformed.

In the tunnel structure according to another aspect of the present invention, the first gradient portion, the second gradient portion, the deepest portion located between the two gradient portions, and the first gradient portion and the deepest portion are connected to each other. A tunnel including a first arc portion to be formed, a second arc portion connecting the second slope portion and the deepest portion, and the first arc portion and the second arc portion inserted into the tunnel over the entire length thereof. A pipe that bends along an arc portion and a plurality of rollers that are arranged in the tunnel and support the pipe in both the first arc portion and the second arc portion are provided.

In this aspect, when the pipe is inserted from the first slope portion on one end side of the tunnel, the pipe is inserted into the deepest portion of the tunnel from the first slope portion via the first arc portion. Further, the pipe reaches the other end of the tunnel from the deepest portion through the second arc portion and the second slope portion. The pipe inserted into the tunnel bends along the first arc portion and the second arc portion by being supported by a plurality of rollers provided in both the first arc portion and the second arc portion. That is, in the first arc portion and the second arc portion, the pipe bends along the first arc portion and the second arc portion by bending within the elastic deformation region of the pipe between the plurality of rollers. Therefore, the pipe can be passed through the first arc portion and the second arc portion without bending the pipe in advance.
According to such a configuration, pipes continuous in the extending direction are continuously inserted into the tunnel from the first slope side without transporting a pipe having a predetermined length from the shaft into the tunnel as in the conventional case. , Can be installed in a tunnel. In this way, it is not necessary to perform operations such as welding, inspection, and anticorrosion treatment between pipes in a tunnel where the work environment is poor, and these operations can be performed on the ground, so that the work can be performed efficiently in a good work environment. It is possible to lay pipes smoothly in the tunnel while connecting the pipes.

Further, when the pipe is supported by the two rollers on the start point side and the end point side of the first arc portion and is not supported between the two rollers, the pipe elastically deforms in the first arc portion. Of these, the ratio of the distance to the most flexible portion with respect to the chord connecting the portions supported by the two rollers is larger than the ratio of the arrow height to the chord of the first arc portion, and the pipe is connected to the first. Two of the pipes that are elastically deformed in the second arc portion when they are supported by the two rollers on the start point side and the end point side of the two arc portions and are not supported between the two rollers. The ratio of the distance to the most flexible portion to the chord connecting the portions supported by the second arc portion may be larger than the ratio of the arrow height to the chord of the second arc portion.

In this case, the bending of the pipe is large, and the above-mentioned action and effect can be remarkably achieved.

Further, the rollers may be arranged within the range of the first arc portion and the second arc portion in the extending direction of the tunnel.

In this case, in addition to the rollers on the start point side and the end point side of both the first arc portion and the second arc portion, the rollers provided within the range of the first arc portion and the second arc portion also support the curved pipe. can do.

The pipe insertion device according to another aspect of the present invention has a first gradient portion, a second gradient portion, a deepest portion located between both gradient portions, and the first gradient portion and the deepest portion. A device for inserting a pipe into a tunnel including a first arc portion to be connected and a second arc portion connecting the second slope portion and the deepest portion, which is attached to the pipe and described above. When the trolley for running the pipe in the tunnel and the start point side and the end point side of the first arc portion are arranged and the pipe is inserted into the deepest portion through the first slope portion and the first arc portion. , A first roller that supports the pipe.

In this aspect, when the carriage attached to the pipe travels in the tunnel, the reaction force acting on the carriage from the tunnel side increases due to the curvature of the tunnel in the first arc portion of the tunnel. Due to this reaction force, the pipe elastically deforms and bends according to the curvature of the first arc portion. By supporting the pipe bent according to the curvature by the first rollers arranged on the start point side and the end point side of the first arc portion of the tunnel in this way, the pipe bends along the first arc portion in the tunnel. And, a tunnel structure including a plurality of first rollers arranged in the tunnel and supporting the pipe on the start point side and the end point side of the first arc portion is realized.

Further, the wheels provided on the carriage may be positioned differently from the first roller along the circumferential direction of the tunnel at the first roller position.

In this case, when the carriage passes through the first roller, the wheels provided on the carriage pass different positions with respect to the first roller in the circumferential direction of the tunnel. Therefore, it is possible to suppress the interference between the wheels of the carriage and the first roller.

Further, the tip of the pipe supported by the carriage may be arranged at a position higher than that of the first roller.

In this case, the tip of the pipe that is elastically deformed and bent according to the curvature of the first arc portion of the tunnel is arranged at a position higher than that of the first roller, so that the tip of the pipe interferes with the first roller. It can be suppressed.

A second roller that is arranged on the start point side and the end point side of the second arc portion and supports the pipe when the pipe is inserted into the second slope portion through the deepest portion and the second arc portion. May be further provided.
Further, the pipe insertion device according to another aspect of the present invention includes a first gradient portion, a second gradient portion, a deepest portion located between both gradient portions, the first gradient portion and the deepest portion. A device for inserting a pipe into a tunnel including a first arc portion connecting the above and a second arc portion connecting the second slope portion and the deepest portion, and attached to the pipe. , The trolley for running the pipe in the tunnel and the start point side and the end point side of the second arc portion, and the pipe is inserted into the second slope portion through the deepest portion and the second arc portion. Occasionally, a second roller is provided to support the pipe.

In this case, when the trolley attached to the pipe reaches the second arc portion from the deepest portion in the tunnel, the reaction force acting on the trolley from the tunnel side in the second arc portion increases due to the curvature of the tunnel. Due to this reaction force, the pipe elastically deforms and bends according to the curvature of the second arc portion. By supporting the pipe bent according to the curvature by the second rollers arranged on the start point side and the end point side of the second arc portion of the tunnel in this way, the pipe bends along the second arc portion in the tunnel. And, a tunnel structure including a plurality of second rollers arranged in the tunnel and supporting the pipe on the start point side and the end point side of the second arc portion is realized.

Further, the method of inserting the pipe according to another aspect of the present invention is a method of inserting the pipe into the tunnel by using the pipe inserting device as described above, and the pipe to which the trolley is attached is inserted into the pipe. A first step of traveling in a tunnel and inserting the pipe from the first slope portion through the first arc portion into the deepest portion is provided. In the first step, the pipe is traveled by the trolley. By supporting the pipe by the first roller, the pipe is elastically deformed along the first arc portion and passed through the first arc portion.

In this aspect, a tunnel structure including a pipe that bends along a first arc portion in the tunnel and a plurality of first rollers that are arranged in the tunnel and support the pipes on the start point side and the end point side of the first arc portion. Is realized.

Further, the method of inserting the pipe according to another aspect of the present invention is a method of inserting the pipe into the tunnel by using the pipe inserting device as described above, and the pipe to which the trolley is attached is inserted into the pipe. A second step of traveling in a tunnel and inserting the pipe from the deepest portion through the second arc portion into the second slope portion is provided. In the second step, the pipe is traveled by the trolley. By supporting the pipe by the second roller, the pipe is elastically deformed along the second arc portion and passed through the second arc portion.

In this aspect, a tunnel structure including a pipe that bends along a second arc portion in the tunnel and a plurality of second rollers arranged in the tunnel and supporting the pipe on the start point side and the end point side of the second arc portion. Is realized.

According to the present invention, pipes can be smoothly laid in a tunnel while efficiently connecting pipes in a favorable working environment.

It is sectional drawing which shows typically the tunnel structure which concerns on one Embodiment of this invention. FIG. 5 is a schematic view showing a pipe curved at the first arc portion of the tunnel in the tunnel structure shown in FIG. 1. FIG. 5 is a schematic view showing a pipe curved at a second arc portion of a tunnel in the tunnel structure shown in FIG. 1. It is a side view which shows the pipe insertion apparatus which concerns on one Embodiment of this invention. It is a front view of the pipe insertion apparatus shown in FIG. It is a flowchart which shows the flow of the pipe insertion method which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view showing a state in which a plurality of rollers are installed in a tunnel in the pipe insertion method shown in FIG. FIG. 6 is a cross-sectional view showing a state in which a pipe is inserted into a first slope portion of a tunnel in the method of inserting a pipe shown in FIG. FIG. 6 is a cross-sectional view showing a state immediately before the tip of the pipe reaches the first arc portion of the tunnel in the method of inserting the pipe shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the tip end portion of the pipe is bent and curved at the first arc portion of the tunnel in the pipe insertion method shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the tip end portion of the pipe has passed through the first arc portion in the pipe insertion method shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the tip end portion of the pipe passes through the first arc portion and reaches the deepest portion in the pipe insertion method shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the tip end portion of the pipe passes through the second arc portion and reaches the second slope portion in the pipe insertion method shown in FIG. It is sectional drawing which shows the modification of the tunnel structure which concerns on one Embodiment of this invention.

Hereinafter, the tunnel structure, the pipe insertion device, and the pipe insertion method according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the tunnel 1 bypasses the pile foundation 2 and the river 3 of an existing structure such as an embankment or a bridge girder downward. The tunnel 1 mainly includes a tunnel deepest portion (deepest portion) 11, a first gradient portion 12, a second gradient portion 13, a first arc portion 14, and a second arc portion 15.

The deepest part 11 of the tunnel is provided in the ground G below the pile foundation 2 and the river 3, and extends in the horizontal direction. The first slope portion 12 extends obliquely upward from one end of the tunnel deepest portion 11 toward the ground surface portion. The upper end 12t of the first slope portion 12 is open in the first shaft 16 provided on the ground surface portion. The second slope portion 13 extends obliquely upward from the other end of the tunnel deepest portion 11 toward the ground surface portion. The upper end 13t of the second slope portion 13 is open in the second shaft 17 provided on the ground surface portion.

The first arc portion 14 connects one end of the tunnel deepest portion 11 with the first gradient portion 12. The first arc portion 14 is curved in an arc shape with a predetermined radius of curvature (for example, a radius of curvature of 250 m). The second arc portion 15 is provided between the other end portion of the tunnel deepest portion 11 and the second slope portion 13. The second arc portion 15 is curved in an arc shape with a predetermined radius of curvature (for example, a radius of curvature of 250 m). Here, the radius of curvature of the first arc portion 14 and the radius of curvature of the second arc portion 15 may be the same or different from each other.

The first shaft 16 and the second shaft 17 are formed shallower than the deepest part 11 of the tunnel from the ground surface, respectively. The first shaft 16 and the second shaft 17 need only be formed below the upper end 12t of the first slope portion 12 and the upper end 13t of the second slope portion 13, at a depth of up to the deepest portion 11 of the tunnel. There is no need to excavate and form.

In such a tunnel 1, for example, the excavator is started from the first shaft 16 and the excavator is propelled by the propulsion method, and the first slope portion 12 is inclined diagonally downward from the upper end 12t side at a predetermined inclination angle. I will build it. In this way, in the first gradient portion 12, for example, the first gradient portion 12 is constructed with a downward gradient of 30 ° or more. As the propulsion method, an existing method may be used. In the propulsion method, while excavating a tunnel hole by excavating the ground G with an excavator, the tunnel skeleton assembled in the first shaft 16 is tunneled with a propulsion jack in which a reaction force is supported on the wall surface of the first shaft 16. It will be promoted sequentially in the hole.

When the excavator reaches the tunnel deepest part 11 via the first slope part 12 and the first arc part 14 by the propulsion method, the propulsion method is switched to the shield method, and the tunnel deepest part 11, the second arc part 15, and the second The two gradient portions 13 are sequentially constructed. As the shield method, an existing method may be used. In the shield method, the ground G is excavated with an excavator to excavate a tunnel hole, and the segments constituting the tunnel skeleton are sequentially assembled in the excavator.
The construction of the tunnel 1 is completed when the second slope portion 13 constructed by the shield method reaches the second shaft 17.

By providing the first slope portion 12 and the second slope portion 13, such a tunnel 1 does not need to excavate a deep shaft reaching the deepest part 11 of the tunnel, and is significantly shallower than the deepest part 11 of the tunnel. The shaft 16 and the second shaft 17 may be excavated. As a result, the construction period can be shortened and the construction cost can be reduced.
Further, when constructing the first gradient portion 12 having a downward slope, the first gradient portion 12 can be reliably constructed even if the inclination is difficult with the shield method by using the propulsion method. Further, by constructing the tunnel deepest portion 11 by the shield method, the construction can be reliably performed even if the tunnel deepest portion 11 is at a large depth.
The above-mentioned method for constructing the tunnel 1 is only an example. For example, the entire length of the tunnel 1 may be constructed by a propulsion method or a shield method.

In such a tunnel 1, for example, a pipe 20 used as a gas pipe, a water pipe, or the like is laid. The pipe 20 is long and continuous in the stretching direction by welding a plurality of pipe members 21 having a predetermined length to each other. The pipe 20 is inserted into the tunnel 1 over the entire length between the ground surface portion on the first shaft 16 side and the ground surface portion on the second shaft 17 side. Specifically, the pipe 20 has a first slope portion 12, a first arc portion 14, a tunnel deepest portion 11, a second arc portion 15, and a second gradient from the first shaft 16 side to the second shaft 17 side. It is inserted in the portion 13. The pipe 20 is continuously inserted from one end of the tunnel 1 (first gradient portion 12 in this embodiment).

The pipe 20 has curved portions 20b and 20c bent in a substantially arc shape along the first arc portion 14 and the second arc portion 15 in the first arc portion 14 and the second arc portion 15. The pipe 20 is supported by a plurality of rollers 30 provided in the tunnel 1 and is bent in a substantially arc shape along the first arc portion 14 and the second arc portion 15. In the present embodiment, the first roller 31 and the second roller 32 are provided as the plurality of rollers 30.

As shown in FIG. 2, the first roller 31 is provided on the start point side and the end point side of the first arc portion 14 in the extending direction of the tunnel 1. In other words, the first roller 31 is arranged on both sides (outside the range of the first arc portion 14) sandwiching the first arc portion 14 in the extending direction. In the present embodiment, the first roller 31 is rotatably provided on the roller support base 33 fixed to the inner peripheral surface of the tunnel 1 about a horizontal line perpendicular to the traveling direction of the pipe 20.

The pipe 20 includes a first roller 31A located on the first slope portion 12 on one side of the first arc portion 14, and a first roller 31B located on the deepest tunnel portion 11 on the other side of the first arc portion 14. By being supported by, it is curved in a substantially arc shape to form a curved portion 20b. The pipe 20 is supported by two first rollers 31A and 31B on the start point side and the end point side of the first arc portion 14, and is not supported between these first rollers 31A and 31B. In the curved portion 20b, the pipe 20 supported by the first rollers 31A and 31B at two points on the start point side and the end point side of the first arc portion 14 bends downward in a substantially arc shape between the first rollers 31A and 31B. It is formed by. In the curved portion 20b, the pipe 20 is not plastically deformed, but is in a state of being elastically deformed within the elastic deformation region of the pipe 20. Here, the curved portion 20b is not always curved with a constant radius of curvature, and the radius of curvature may change in the extending direction of the tunnel 1. Further, the region where the curved portion 20b is curved is not limited to between the first rollers 31A and 31B, and may reach the outside of the first rollers 31A and 31B in the extending direction of the pipe 20.

As shown in FIG. 3, the second roller 32 is provided on the start point side and the end point side of the second arc portion 15 in the extending direction of the tunnel 1. In other words, the second roller 32 is arranged on both sides (outside the range of the second arc portion 15) sandwiching the second arc portion 15 in the extending direction. In the present embodiment, the second roller 32 is rotatably provided on the roller support base 33 fixed to the inner peripheral surface of the tunnel 1 about a horizontal line perpendicular to the traveling direction of the pipe 20.

The pipe 20 includes a second roller 32A located at the deepest part 11 of the tunnel on one side of the second arc portion 15, and a second roller 32B located at the second slope portion 13 on the other side of the second arc portion 15. By being supported by, it is curved in an arc shape to form a curved portion 20c. The pipe 20 is supported by two second rollers 32A and 32B on the start point side and the end point side of the second arc portion 15, and is not supported between these second rollers 32A and 32B. In the curved portion 20c, the pipe 20 supported by the second rollers 32A and 32B at two points on the start point side and the end point side of the second arc portion 15 bends downward in a substantially arc shape between the second rollers 32A and 32B. It is formed by. In the curved portion 20c, the pipe 20 is not plastically deformed, but is in a state of being elastically deformed within the elastic deformation region of the pipe 20. Here, the curved portion 20c is not always curved with a constant radius of curvature, and the radius of curvature may change in the extending direction of the tunnel 1. Further, the region where the curved portion 20c is curved is not limited to between the second rollers 32A and 32B, and may reach the outside of the second rollers 32A and 32B in the extending direction of the pipe 20.

As shown in FIGS. 2 and 3, the average radius of curvature Rp of the pipe 20 in the curved portions 20b and 20c is smaller than the maximum radius of curvature Rmax allowed for the pipe 20. The maximum radius of curvature Rmax is the maximum radius of curvature set so that the pipe 20 does not reach the plastic deformation region. As a result, in the curved portions 20b and 20c, the pipe 20 does not reach the plastic deformation region and is bent within the elastic deformation region.

In the pipe 20 supported by the two first rollers 31A and 31B and curved in a substantially arc shape, the length of the string connecting the portions supported by the two first rollers 31A and 31B is La1, and the pipe is connected from this string. Let D1 be the distance (arrow height) to the portion where 20 bends most between the first rollers 31A and 31B. The string can be said to be a string connecting the position where the pipe 20 starts to bend and the position where the pipe 20 starts to bend in the first arc portion 14. The ratio D1 / La1, which is the ratio of the distance D1 to the length La1, is larger than the ratio A1 / Lb1 of the arrow height A1 to the string Lb1 connecting the start point and the end point in the first arc portion 14 of the center line Ct of the tunnel 1. ..
Further, in the pipe 20 supported by the two second rollers 32A and 32B and curved in a substantially arc shape, the length of the string connecting the portions supported by the two second rollers 32A and 32B is La2, and the length of the string is La2. Let D2 be the distance (arrow height) to the portion where the pipe 20 bends most between the second rollers 32A and 32B. The string can be said to be a string connecting the position where the pipe 20 starts to bend and the position where the pipe 20 starts to bend in the second arc portion 15. The ratio D2 / La2, which is the ratio of the distance D2 to the length La2, is larger than the ratio A2 / Lb2 of the arrow height A2 to the string Lb2 connecting the start point and the end point in the second arc portion 15 of the center line Ct of the tunnel 1. ..

The curved portions 20b and 20c formed by bending the pipe 20 within the elastic deformation region as described above have a plurality of rollers 30 (two first rollers 31A and 31B, two) depending on the material characteristics of the pipe 20. It is formed by appropriately setting the interval between the second rollers 32A and 32B).
For example, the distance between the plurality of rollers 30 is set based on the amount of deflection of the pipe 20 due to its own weight. The amount of deflection of the pipe 20 due to its own weight is calculated by a function including the unit weight of the pipe 20, the section modulus, and Young's modulus.
The plurality of rollers 30 may be installed at intervals such that the bending due to the weight of the pipe 20 is along the first arc portion 14 and the second arc portion 15. Further, the positions of the plurality of rollers 30 may be adjusted so that the average radius of curvature Rp of the pipe 20 becomes an appropriate value according to the pipe 20 curved by the first arc portion 14 and the second arc portion 15. ..

Next, the pipe inserting device 50 and the method of inserting the pipe 20 for realizing the tunnel structure including the tunnel 1 and the pipe 20 inserted in the tunnel 1 as described above will be described.
As shown in FIGS. 4 and 5, the pipe insertion device 50 for inserting the pipe 20 into the tunnel 1 includes the plurality of rollers 30 (first roller 31, second roller 32) and a carriage 51 described above. ..

The carriage 51 includes a pipe support portion 52 that supports the pipe 20 and wheels 53. The pipe support portion 52 has, for example, an annular shape, and the tip 20S of the pipe 20 is inserted inside the pipe support portion 52. The pipe support portion 52 is formed in an annular shape by combining the semicircular upper member 52A and the lower member 52B. The upper member 52A and the lower member 52B are connected to each other by attaching and detaching the upper flange 52f and the lower flange 52g provided at the joint thereof with bolts (not shown) or the like. The pipe 20 is held by the pipe support portion 52 in a state where the upper member 52A and the lower member 52B are connected to each other.

The wheel 53 is provided below the pipe support portion 52. Each wheel 53 is rotatably provided on a wheel support portion 54 fixed to the pipe support portion 52. The wheels 53 are provided in pairs with respect to the pipe support portion 52 at intervals in the circumferential direction around the central axis of the pipe 20. These two pairs of wheels 53 are arranged on both sides in the circumferential direction with respect to the rollers 30 (first roller 31, second roller 32).

Such a carriage 51 supports the pipe 20 so that the tip 20S of the pipe 20 is located higher than the first roller 31 and the second roller 32.
The trolley 51 winds a traction tool 55 such as a wire rope with a winding device such as a winch (not shown), so that the pipe 20 having the tip 20S supported on the pipe support portion 52 of the trolley 51 is extended in the direction of extension of the tunnel 1. Pull in to.
The wheels 53 provided on the carriage 51 are provided at intervals in the circumferential direction around the central axis of the pipe 20. The wheels 53 pass on both sides in the circumferential direction with respect to the rollers 30 provided at the lowermost part of the tunnel 1.

As shown in FIG. 6, the pipe insertion method for inserting the pipe 20 into the tunnel 1 using the pipe insertion device 50 includes a pipe welding step S1 and a pipe insertion step (first step, second step) S2. Including. Here, in the present embodiment, the pipe 20 is inserted into the tunnel 1 from the first slope portion 12 side toward the second slope portion 13 side. Therefore, in the insertion direction of the pipe 20, the first slope portion 12 has a downward slope and the second slope portion 13 has an up slope.

In the pipe welding step S1, as shown in FIG. 7, a long pipe 20 is formed by welding a pipe material 21 having a predetermined length on the ground surface portion on the side of the first shaft 16. The pipe welding step S1 is continuously executed on the ground surface in parallel with the pipe 20 insertion work in the pipe insertion step S2 described later.
After welding a certain number of pipe materials 21 on the ground surface, the carriage 51 is attached to the tip 20S of the pipe 20.
On the other hand, a plurality of rollers 30 (first roller 31, second roller 32) are installed in advance in the tunnel 1.

After that, in the pipe insertion step S2, the pipe 20 is inserted into the tunnel 1. In the pipe insertion step S2, the pipe 20 is inserted into the deepest portion 11 of the tunnel from the first gradient portion 12 through the first arc portion 14. In the present embodiment, the pipe insertion step S2 includes a step S21 for passing the pipe 20 through the first slope portion 12, a step S22 for passing the pipe 20 through the first arc portion 14, and a step S23 for passing the pipe 20 through the deepest portion 11 of the tunnel. A step S24 of passing the pipe 20 through the second arc portion 15 and a step S25 of passing the pipe 20 through the second slope portion 13 are included.

In the step S21 of passing the pipe 20 through the first slope portion 12, as shown in FIG. 8, the pipe 20 having the carriage 51 attached to the tip 20S is inserted into the first slope portion 12 from the first shaft 16. At this time, at the portion P where the pipe 20 is inserted into the first slope portion 12 from the ground surface portion through the first shaft 16, the pipe 20 curves diagonally downward due to its own weight.
By pulling the towing tool 55 (see FIG. 5) provided on the carriage 51 in the extending direction of the tunnel 1, the pipe 20 is sequentially pulled into the first slope portion 12. In the tunnel 1, the wheels 53 of the carriage 51 roll on the inner peripheral surface (lower surface) of the tunnel 1. As a result, the pipe 20 runs in the tunnel 1.

In the step S22 of passing the pipe 20 through the first arc portion 14, as shown in FIGS. 9 and 10, the tip 20S of the pipe 20 is passed from the first gradient portion 12 to the first arc portion 14. As shown in FIG. 9, when the carriage 51 passes through the first roller 31A provided on the first slope portion 12 side with respect to the first arc portion 14, the pipe 20 is formed by the carriage 51 and the first roller 31A. It will be in a supported state.

As shown in FIG. 10, when the carriage 51 enters the first arc portion 14, the reaction force F acting on the carriage 51 from the tunnel 1 side increases due to the curvature of the tunnel 1. Due to this reaction force F, the pipe 20 supported by the bogie 51 is elastically deformed and bent according to the curvature of the first arc portion 14. At this time, the pipe 20 is curved downward while being supported at two points by the carriage 51 and the first roller 31A.

As shown in FIG. 11, when the carriage 51 passes through the first arc portion 14, the tip 20S of the pipe 20 enters the deepest portion 11 of the tunnel. At this time, the tip 20S of the pipe 20 supported by the carriage 51 is arranged at a position higher than that of the first roller 31B at the position of the first roller 31, so that the tip 20S of the pipe 20 curved by the curved portion 20b is the first. Interference with 1 roller 31B is suppressed.

In the step S23 of passing the pipe 20 through the deepest part 11 of the tunnel, as shown in FIG. 12, the pipe 20 is driven toward the second arc portion 15 along the deepest part 11 of the tunnel by pulling the carriage 51. .. At this time, after the carriage 51 has passed through the first roller 31B, the pipe 20 is curved in a state of being supported at two points by the first rollers 31A and 31B in the first arc portion 14 rearward in the traveling direction of the pipe 20. To maintain. That is, while the pipe 20 is driven by the carriage 51, in the portion supported by the first rollers 31A and 31B, the pipe 20 elastically deforms the first arc portion 14 along the first arc portion 14 in a substantially arc shape while deforming the first arc portion 14. I will pass through.

In the step S24 of passing the pipe 20 through the second arc portion 15, as shown in FIG. 13, when the trolley 51 passing through the deepest tunnel portion 11 enters the second arc portion 15, the trolley is bent from the tunnel 1 side due to the curvature of the tunnel 1. The reaction force F acting on 51 increases. Due to this reaction force F, the pipe 20 supported by the bogie 51 is elastically deformed and bent according to the curvature of the second arc portion 15.

In the step S25 of passing the pipe 20 through the second slope portion 13, when the carriage 51 that has passed through the second arc portion 15 enters the second slope portion 13, the pipe 20 makes an ascending slope along the second slope portion 13 on the ground surface. I will drive toward the club. When the tip 20S of the pipe 20 reaches the inside of the second shaft 17, the pipe 20 is inserted over the entire length of the tunnel 1.
After that, the tip 20S of the pipe 20 is pulled up from the inside of the second shaft 17 to the ground surface together with the carriage 51. Further, by backfilling the first shaft 16, the second shaft 17, and the like, the laying of the pipe 20 in the tunnel 1 is completed, and the tunnel structure as shown in FIG. 1 is realized.

As described above, according to the tunnel structure according to the present embodiment, the pipe 20 which is inserted into the tunnel 1 over the entire length and bends along the first arc portion 14 and the second arc portion 15 and the tunnel 1 A plurality of rollers 30 that are arranged and each of which supports the pipe 20 in both the first arc portion 14 and the second arc portion 15 are provided.
In such a configuration, the pipe 20 is inserted into the deepest tunnel portion 11 of the tunnel 1 from the first gradient portion 12 on one end side of the tunnel 1 via the first arc portion 14. Further, the pipe 20 reaches the other end of the tunnel 1 from the deepest portion 11 of the tunnel through the second arc portion 15 and the second gradient portion 13. The pipe 20 inserted into the tunnel 1 is supported by a plurality of rollers 30 provided on both the first arc portion 14 and the second arc portion 15, so that the first arc portion 14 and the second arc portion 15 are supported. Turn along. That is, in the first arc portion 14 and the second arc portion 15, the pipe 20 bends downward within the elastic deformation region of the pipe 20 between the plurality of rollers 30, so that the first arc portion 14 and the second arc portion 14 and the second arc portion are bent downward. Turn along 15. Therefore, the pipe 20 can be passed through the first arc portion 14 and the second arc portion 15 while being elastically deformed and curved without bending the pipe 20 in advance.
According to such a configuration, the pipe 20 continuous in the extending direction is continuously connected to the tunnel 1 from the first slope portion 12 side without transporting the pipe material having a predetermined length from the shaft into the tunnel 1 as in the conventional case. The pipe 20 can be laid in the tunnel 1. In this way, it is not necessary to perform operations such as welding, inspection, and anticorrosion treatment between the pipes 20 in the tunnel 1 in which the working environment is poor, and these operations can be performed on the ground surface (ground). Therefore, it is possible to smoothly lay the pipe 20 in the tunnel 1 while efficiently connecting the pipe 20 in a good working environment.

Further, the rollers 30 are arranged on the outer side in the radial direction of the first arc portion 14 and the second arc portion 15.
According to such a configuration, the pipe 20 bends between the plurality of rollers 30 arranged radially outside the first arc portion 14 and the second arc portion 15, so that the first arc portion 14 of the tunnel 1 is bent. And it is curved according to the radius of curvature of the second arc portion 15.

Further, the pipe insertion device 50 according to the present embodiment is attached to the pipe 20 and is arranged on the trolley 51 for running the pipe 20 in the tunnel 1 and the start point side and the end point side of the first arc portion 14, and the pipe 20 is provided. It includes a first roller 31 that supports the pipe 20 when it is inserted into the deepest portion 11 of the tunnel through the first gradient portion 12 and the first arc portion 14.
In such a configuration, when the carriage 51 attached to the pipe 20 travels in the tunnel 1, in the first arc portion 14 of the tunnel 1, the reaction force F acting on the carriage 51 from the tunnel 1 side is caused by the curvature of the tunnel 1. Increase. Due to this reaction force F, the pipe 20 is elastically deformed and bent according to the curvature of the first arc portion 14. By supporting the pipe 20 bent according to the curvature by the first rollers 31 arranged on the start point side and the end point side of the first arc portion 14 of the tunnel 1, the first arc portion in the tunnel 1 is supported. A tunnel structure including a pipe 20 that bends along 14 and a plurality of first rollers 31 that are arranged in the tunnel 1 and support the pipe 20 on the start point side and the end point side of the first arc portion 14 is realized.
When the pipe 20 is elastically deformed and bent by the reaction force F acting on the carriage 51 in the first arc portion 14, a large reaction force F acts on the carriage 51. It is conceivable to provide a plurality (many) rollers provided on the tunnel 1 side instead of the carriage 51, but the tip of the pipe 20 interferes with the rollers between the plurality of rollers. Therefore, it is difficult to feed the pipe 20 in the extending direction while bending the pipe 20 only by a plurality of rollers provided on the tunnel 1 side. Further, in that case, it is necessary to increase the strength of the plurality of rollers so that they can withstand a large reaction force F, which is a large scale. On the other hand, in the configuration of the present embodiment, it is sufficient to increase the strength of only the carriage 51 so that it can withstand a large reaction force F, and the cost increase can be suppressed.

Further, the wheels 53 provided on the carriage 51 are positioned differently from the first roller 31 along the circumferential direction of the tunnel 1.
According to such a configuration, when the carriage 51 passes through the first roller 31, the wheels 53 provided on the carriage 51 pass different positions with respect to the first roller 31 in the circumferential direction of the tunnel 1. Therefore, it is possible to suppress the interference between the wheels 53 of the carriage 51 and the first roller 31.

Further, the tip 20S of the pipe 20 supported by the carriage 51 is arranged at a position higher than the first roller 31 at the position of the first roller 31, and is arranged at a position higher than the second roller 32 at the position of the second roller 32. To.
According to such a configuration, the tip 20S of the pipe 20 which is elastically deformed and bent according to the curvature of the first arc portion 14 and the second arc portion 15 of the tunnel 1 becomes the first roller 31 and the second roller 32. Interference can be suppressed.

Further, a second roller 32 for supporting the pipe 20 is further provided when the pipe 20 is inserted into the second slope portion 13 through the tunnel deepest portion 11 and the second arc portion 15.
According to such a configuration, the pipe 20 bent according to the curvature of the second arc portion 15 is supported by the second rollers 32 arranged on the start point side and the end point side of the second arc portion 15 of the tunnel 1. A pipe 20 that bends along the second arc portion 15 in the tunnel 1 and a plurality of second rollers 32 that are arranged in the tunnel 1 and support the pipe 20 on the start point side and the end point side of the second arc portion 15. , A tunnel structure is realized.

Further, in the method of inserting the pipe 20 according to the present embodiment, the carriage 51 attached to the pipe 20 is run in the tunnel 1, and the pipe 20 is elastically deformed and bent according to the curvature of the first arc portion 14. .. By supporting the pipe 20 bent according to the curvature by the first rollers 31 arranged on the start point side and the end point side of the first arc portion 14 of the tunnel 1, the first arc portion in the tunnel 1 is supported. A tunnel structure including a pipe 20 that bends along 14 and a plurality of first rollers 31 that are arranged in the tunnel 1 and support the pipe 20 on the start point side and the end point side of the first arc portion 14 is realized.

The technical scope of the present invention is not limited to the embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, as shown in FIG. 14, the roller 39 may be arranged within the range of the first arc portion 14 and the second arc portion 15 in the extending direction of the tunnel 1.
In this case, in addition to the rollers 30 (first roller 31, second roller 32) provided outside the first arc portion 14 and the second arc portion 15, the range of the first arc portion 14 and the second arc portion 15 A roller 39 provided inside can also support the curved pipe 20.

Further, in the above embodiment, a plurality of rollers 30 (first roller 31, second roller 32) are installed prior to insertion of the pipe 20 into the tunnel 1, but the present invention is not limited to this. In the plurality of rollers 30, the tip 20S of the pipe 20 traveling in the tunnel 1 by the carriage 51 passes through the first arc portion 14 and the second arc portion 15, and the pipe 20 is curved to form the curved portions 20b and 20c. After that, the roller 30 may be installed later. Further, the roller 30 may be provided in the middle of, for example, the deepest tunnel portion 11, the first gradient portion 12, the second gradient portion 13, etc., in addition to both the first arc portion 14 and the second arc portion 15. ..

Further, in the above embodiment, the carriage 51 is attached to the tip 20S of the pipe 20 until it passes through the second slope portion 13 of the tunnel 1, but the present invention is not limited to this. For example, the carriage 51 may be used only in the region where the tip 20S of the pipe 20 is curved by the first arc portion 14 and is delivered to the first roller 31B on the deepest portion 11 side of the tunnel. That is, after the tip 20S of the pipe 20 passes through the first roller 31B located at the deepest portion 11 of the tunnel on the side of the first arc portion 14, the carriage 51 is removed and the pipe 20 to be sequentially fed is transferred to the deepest portion 11 of the tunnel. It may be carried on a plurality of rollers provided in the above.

Further, the carriage 51 may be used only in the region where the tip 20S of the pipe 20 is curved by the second arc portion 15 and is delivered to the roller 30 on the second gradient portion 13 side, for example. That is, after the tip 20S of the pipe 20 passes through the roller 30 located on the second slope portion 13 side in the second arc portion 15, the pipe 20 is conveyed on the roller 30 provided in the second slope portion 13. You may do so.

Further, the pipe 20 is inserted into the tunnel 1 from the first slope portion 12 side toward the second slope portion 13 side, but the present invention is not limited to this. For example, the pipe 20 may be inserted from the first slope portion 12 side through the first arc portion 14, and the pipe 20 may be inserted from the second slope portion 13 side through the second arc portion 15. The pipe 20 inserted from the first slope portion 12 side and the pipe 20 inserted from the second slope portion 13 side may be joined in the deepest portion 11 of the tunnel.

Further, in the above embodiment, the pipe 20 is inserted into the tunnel 1 by using the method of inserting the pipe inserting device 50 and the pipe 20 over the entire length of the tunnel 1, but the present invention is not limited to this. If the pipe 20 is inserted into the tunnel 1 by using the pipe inserting device 50 and the pipe 20 insertion method in a part of the total length of the tunnel 1 (a part including the first arc portion 14 and the second arc portion 15), the tunnel is formed. In the remaining portion of 1, a pipe 20 having a predetermined length may be carried into the tunnel 1 and the pipe 20 may be joined by welding or the like in the tunnel 1. Even in such a case, by inserting the pipe 20 into the tunnel 1 by using the pipe inserting device 50 and the method of inserting the pipe 20, the amount of work such as welding in the tunnel 1 can be reduced. Therefore, it is possible to smoothly construct the pipeline in the tunnel 1 while efficiently connecting the pipes 20 in a good working environment.

In addition, it is possible to replace the components in the embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

1 Tunnel 11 The deepest part of the tunnel (the deepest part)
12 1st slope 13 2nd slope 14 1st arc 15 2nd arc 20 Pipe 20S Tip 30 Rollers 31, 31A, 31B 1st roller 32, 32A, 32B 2nd roller 39 Roller 50 Pipe insertion device 51 trolley 53 Wheels A1, A2 Arrow height D1, D2 Distance La1, La2, Lb1, Lb2 String S2 Pipe insertion step (first step)

Claims (9)

A tunnel including a first arc portion and a second arc portion,
A pipe that is continuously inserted from one end of the tunnel and bends along the first arc portion and the second arc portion.
A tunnel structure including a plurality of rollers that support the pipe in both the first arc portion and the second arc portion. The ratio of the arrow height, which is the distance to the most flexed portion, from the string connecting the position where the pipe begins to bend and the position where the pipe bends in the first arc portion is the chord connecting the start point and the end point of the first arc portion. It is larger than the ratio of the arrow height of the first arc portion,
The ratio of the arrow height, which is the distance to the most flexed portion, from the string connecting the position where the pipe begins to bend and the position where the pipe bends in the second arc portion is the chord connecting the start point and the end point of the second arc portion. The tunnel structure according to claim 1, which is larger than the ratio of the arrow heights of the second arc portion. The tunnel structure according to claim 1 or 2, wherein the roller is fixed within the range of the first arc portion and the second arc portion in the extending direction of the tunnel. A dolly that is fixed to the tip of a pipe that is continuously inserted from one end of the tunnel and runs the pipe in the tunnel.
A pipe insertion device including a first roller fixed inside the tunnel and supporting the pipe. The wheels provided on the carriage are positioned differently from the first roller along the circumferential direction of the tunnel, and the tip of the pipe is higher than the first roller at the first roller position. The pipe insertion device according to claim 4, which is arranged at a position. The pipe insertion device according to claim 4, further comprising the carriage and a second roller fixed inside the tunnel to support the pipe. The wheels provided on the carriage are positioned differently from the second roller along the circumferential direction of the tunnel, and the tip of the pipe is higher than the second roller at the second roller position. The pipe insertion device according to claim 6, which is arranged at a position. A method of inserting a pipe into a tunnel using the pipe insertion device according to any one of claims 4 to 7.
The first step of inserting into the deepest part through the first arc part of the tunnel is provided.
In the first step, the pipe is supported by the first roller while the pipe is driven by the carriage, so that the pipe is elastically deformed along the first arc portion and passes through the first arc portion. How to insert a pipe to make. A second step is provided in which the pipe to which the carriage is attached is run in the tunnel, and the pipe is inserted from the deepest portion through the second arc portion of the tunnel into the second slope portion of the tunnel.
In the second step, the pipe is supported by the second roller while the pipe is driven by the carriage, so that the pipe is elastically deformed along the second arc portion and passed through the second arc portion. The method for inserting a pipe according to claim 8.

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