JP3609364B2 - Tunnel connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel connection method.
[0002]
[Prior art]
Conventionally, underground use of roads, railways, etc. has been mentioned as one of the underground usage measures in urban areas. Such road and railway tunnels are constructed by the shield method because the land is not sufficient, there are many ground restrictions, and the ground is soft.
The tunnel constructed by the shield method has a mechanically circular cross section that has the most efficient shape. However, since the shape of the tunnel required for building roads and railways is rectangular (horizontal rectangle), a circular tunnel with a diameter larger than necessary is constructed in advance, and the inside of the circular tunnel is It was supposed to build a rectangular tunnel.
[0003]
Therefore, recently, an MMST (multi-micro shield tunnel) method (see Japanese Patent Application Laid-Open No. 2000-328899) for connecting rectangular tunnels to form a peripheral tunnel into a rectangle, and a multi-circular MF (multi-face) method A construction method such as a DOT (double oh tube) construction method for constructing a tunnel having a combination of a plurality of circular tunnels has been devised and implemented.
[Problems to be solved by the invention]
However, in the MMST method, for example, when connecting small-diameter tunnels composed of a plurality of segments (see FIG. 2), it is necessary to improve the ground to ensure safety. There was a problem that it was difficult to ensure safety by the improved construction method.
Further, for example, in the multi-circular MF construction method, since the shield machine is manufactured in accordance with the shape of the tunnel to be constructed, the shield machine is not versatile and difficult to divert. Another problem is that the construction cost of the shield machine is high due to the high production cost of the shield machine.
[0004]
The present invention has been made in view of the above circumstances, and provides a tunnel connection method capable of easily and safely connecting at least two tunnels and reducing the cost of tunnel construction. The purpose is to do.
[0005]
[Means for Solving the Problems]
To solve the above problem,
The invention of claim 1 is, for example, as shown in FIG.
A tunnel connection method for connecting tunnels composed of a plurality of segments 50 that mount an inner surface of an underground cavity formed by excavating natural ground using a female segment 10 and a male segment 20,
A concave female connection member 11 is provided on the natural mountain side inside the female segment 10,
A portion of the male segment 20 on the natural mountain side is provided with a substantially T-shaped male connection member 21 that engages with the female connection member 11 by moving in the axial direction of the tunnel,
First, a first tunnel configured to include the female segment 20 is constructed, and then the male connection member 21 is engaged with the female connection member 11 provided in the first tunnel while the male connection member 21 is engaged. The first tunnel and the second tunnel are connected by moving the male segment 20 in the axial direction of the first tunnel and constructing the second tunnel including the male segment 20. It is characterized by that.
[0006]
Here, the segment may be made of any material such as a steel segment or an RC (reinforced concrete) segment. Further, the shape of the segment may be any shape such as a rectangular shape or a polygonal shape as long as adjacent segments can be connected.
Further, the female connection member and the male connection member are molded from a material that is lightweight and has strength and toughness. Examples of the material include metals, plastics molded from resins such as vinyl chloride, and ceramics.
[0007]
According to the first aspect of the present invention, the first tunnel configured to include the female segment is constructed, and then the male connection member is engaged with the female connection member provided in the first tunnel. Thus, the first tunnel and the second tunnel are connected by constructing the second tunnel behind the scenes. In other words, the second tunnel is constructed by mounting the male segment so as to move the male segment in the axial direction of the first tunnel while engaging the male connection member with the female connection member of the female segment. And the connection between the second tunnel and the first tunnel can be performed. Therefore, when connecting the tunnels, it is not necessary to perform ground improvement by injecting a chemical solution or the like for the purpose of ensuring safety, and at least two or more tunnels can be easily and safely connected.
Furthermore, it is not only necessary to perform ground improvement method, but for example, it is not necessary to create a dedicated shield machine like the multi-circular MF method, and a tunnel can be constructed using a general-purpose shield machine. , They can reduce the cost.
[0008]
Here, as a chemical | medical solution used for ground improvement, cement milk etc. are mentioned, for example.
[0009]
The invention according to claim 2 is the tunnel connection method according to claim 1, for example, as shown in FIG.
The female connection member 11 and the male connection member 21 are provided so as to extend in the axial direction of the tunnel.
[0010]
According to the invention described in claim 2, since the female connection member and the male connection member are provided so as to extend in the axial direction of the tunnel, the connection between the female segment and the male segment is strong. become. Therefore, the two tunnels can be firmly connected.
[0011]
The invention according to claim 3 is the tunnel connection method according to claim 1 or 2, as shown in FIG.
The female connection member 11 and the male connection member 21 are formed by metal molding.
[0012]
According to the third aspect of the present invention, since the female connection member and the male connection member are metal-formed, the connection between the female segment and the male segment becomes stronger. Therefore, the two tunnels can be connected more firmly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The tunnel connection segment 1 to which the present invention is applied connects tunnels composed of a plurality of segments 50 that mount the inner surface of an underground cavity formed by excavating a natural ground.
FIG. 1 is a schematic perspective view illustrating the entire tunnel connection segment 1. FIG. 2 is a schematic perspective view showing the steel segment 50. FIG. 3 is a cross-sectional view of the main part of the female connection member 11 provided in the female segment 10. FIG. 4 is a diagram showing a tunnel construction method constructed using the tunnel connection segment 1.
[0016]
First, the configuration of the tunnel connection segment 1 will be described.
For example, as shown in FIG. 1, the tunnel connection segment 1 is a female segment provided in a first tunnel (one) constructed in advance among the connection portions of two tunnels to be connected (see FIG. 4). 10 and a male segment 20 provided in the second tunnel (the other side) constructed following.
[0017]
The female-type segment 10 is generally configured by a segment main body 12 and a female-type connecting member 11 provided at a natural mountain side portion of the segment main body 50.
The segment body 12 is an arc-shaped steel segment 50 as shown in FIG. 2, for example.
The female connection member 11 is a member that is recessed (concave) in a substantially T-shaped cross section that extends in the axial direction of the tunnel so as to extend from the front end of the segment body 12 to the back end. In FIG. 3 (a), an opening 11a provided on an end surface (skin plate 51: described later) on the natural ground side of the segment main body 12 and a substantially U-shaped cross section provided on the inner side (inside) of the segment main body 12. The female connection member 11 comprised from this plate-shaped part 11b is shown.
[0018]
The segment 50 includes a skin plate 51 that is an end face on the natural ground side, a main girder 52 that serves as a connecting portion between adjacent segment rings (described later), a vertical rib 53 for the purpose of reinforcing the skin plate 51 and the main girder 52, A joint plate 54 serving as a connecting portion between the segments 50, a reinforcing rib 55 for the purpose of reinforcing the joint plate 54, a handle fitting 56 used when transporting the segment 50, for example, a backfill material such as mortar is injected. It is composed of an injection hole 57 and the like.
[0019]
On the other hand, the male segment 20 is schematically configured from a segment main body 22 and a male connection member 21 provided in a natural mountain side portion of the segment main body 22.
Similar to the female segment 10 described above, the segment main body 22 is composed of an arc-shaped steel segment 50 and has a size approximately equal to the segment main body 12 of the female segment 10.
The male connecting member 21 is a convex member having a substantially T-shaped cross section provided at a position corresponding to the female connecting member 11 so as to be engaged with the female connecting member 11. It extends in the axial direction of the tunnel so as to extend from the end on the side to the end on the back side.
[0020]
Each of the female mold and the male connection members 11 and 21 is formed (metal formed) by a steel plate or the like.
[0021]
Therefore, as one of the female segment 10 and the male segment 20 is moved in the axial direction of the tunnel, the female connection member 11 and the male connection member 21 are engaged, and the first tunnel and the first Two tunnels (two tunnels) are connected.
[0022]
Next, a tunnel connection method using the tunnel connection segment 1 will be described.
[0023]
First, the first tunnel is constructed in advance among the first and second tunnels to be connected.
The first tunnel is configured to include a female segment 10. The construction of the first tunnel is performed by a shield method.
Specifically, the second tunnel is constructed in advance by excavating a natural ground by an excavator (not shown) to form an underground cavity and mounting a plurality of segments 50 on its inner surface. The segments 50 are sequentially mounted in such a manner that the female segment 10 is provided at the connection portion (described later in detail).
The first tunnel is constructed by sequentially performing this operation.
Accordingly, the female connection members 11 are arranged in a line in the axial direction at the connection portion of the first tunnel with the second tunnel.
[0024]
A back-filling intrusion prevention plate 58 for preventing the back-filling material injected through the injection hole 57 from entering the female end 10 (skin plate 50) of the female segment 10 to be mounted at this time. The mold connecting member 11 is provided so as to cover the opening 11a.
[0025]
The second tunnel is then constructed following.
The second tunnel is configured to include the male segment 20, and is constructed such that the male connection member 21 is engaged with the female connection member 11 provided in the first tunnel.
[0026]
This second tunnel is constructed by the propulsion method.
Specifically, first, a segment ring (not shown; hereinafter abbreviated as a first segment ring) configured to include the male segment 20 with a shaft (not shown) or the like is assembled. Then, the first segment ring is positioned so that the male connection member 21 provided on the male segment 20 engages with the female connection member 11 provided on the front end of the first tunnel. Thereafter, the excavator (not shown) and the first segment ring are pushed into the ground by a jack (not shown) or the like so as to push the rear end of the first segment ring. Accordingly, the ground is excavated by the excavator, and the first segment ring is pushed into the underground cavity formed in the ground along with excavation. As a result, the male connection member 21 of the first segment ring and the female connection member 11 of the first tunnel are engaged.
[0027]
Subsequently, similarly to the first segment ring, the segment ring to be pushed next (not shown; hereinafter abbreviated as second segment ring) is assembled and positioned by the shaft, and the rear end of the second segment ring is pushed. And push it into the ground with a jack. Accordingly, the ground is further excavated by the excavator, and the first segment ring is further pushed into the underground cavity formed in the ground along with the excavation, and the second segment ring is pushed after the first segment ring. As a result, the first segment ring is pushed into the back side of the underground cavity while being engaged with the female connecting member 11 provided in the axial direction in the first tunnel, and the second segment ring The male connecting member 21 and the female connecting member 11 at the end on the most front side of the first tunnel are engaged with each other.
[0028]
By sequentially performing this operation, the second tunnel is constructed in a state of being connected to the first tunnel.
[0029]
As described above, according to this embodiment, the first tunnel configured to include the female segment 10 that is the tunnel connection segment 1 is constructed, and then the second tunnel is constructed. The female connection member 11 provided on the ground side of the tunnel so as to extend in the axial direction of the first tunnel is provided on the ground side of the second tunnel so as to extend in the axial direction of the second tunnel. By performing the engagement so that the male connection member 12 is engaged, the first tunnel and the second tunnel are firmly connected. In other words, the male segment 20 is moved in the axial direction of the first tunnel while the male connection member 21 is engaged with the female connection member 11 of the female segment 10 constituting the first tunnel. Thus, the construction of the second tunnel and the connection between the second tunnel and the first tunnel are performed. Therefore, when connecting the tunnels, it is not necessary to improve the ground by injecting a chemical solution or the like for the purpose of ensuring safety, and the safety of the worker in the ground can be improved. It is possible to easily and safely connect two or more tunnels.
Furthermore, it is not only necessary to perform ground improvement method, but for example, it is not necessary to create a dedicated shield machine like the multi-circular MF method, and a tunnel can be constructed using a general-purpose shield machine. , They can reduce the cost.
Further, since the female and male connecting members 11 and 21 are provided as separate members in the female and male segments 10 and 20, respectively, they can be replaced according to the shape of the tunnel to be constructed. Furthermore, since the female and male connection members 11 and 21 are formed of steel, the connection between the female segment 10 and the male segment 20 is further strengthened.
[0030]
Further, according to the tunnel connection method of this embodiment, the tunnel can be constructed by a method that is an alternative to the conventional tunnel construction method.
For example, a tunnel construction method that replaces the conventional MMST method will be described with reference to FIG.
First, the rectangular shield tunnels 61 and 62 are constructed in advance. At this time, the female segment 10 is provided in each of the connecting portions 71, 72, 73, and 74 with the tunnel constructed downstream. Thereafter, the rectangular tunnel 63 is constructed by the propulsion method so that the male connection member 21 provided in the rectangular tunnel 63 is engaged with the female connection member 11. As a result, the rectangular shield tunnels 61 and 62 constructed in advance are connected to the rectangular tunnel 63 constructed in the succeeding manner.
By carrying out this operation in the other connection portions 75, 76, 77, 78 in the same way, a large rectangular tunnel similar to the conventional MMST method can be constructed.
Further, for example, FIG. 4B shows a tunnel construction method that replaces the conventional triple MF shield method.
Specifically, first, the circular shield tunnels 81 and 82 are constructed at predetermined intervals in the ground. At this time, the female segment 10 is provided in each of the connecting portions 91, 92, 93, 94 with the tunnel constructed downstream. Thereafter, the roof shields 83 and 84 provided between the circular shield tunnels 81 and 82 are constructed so that the male connection member 21 provided on the roof shields 83 and 84 is engaged with the female connection member 11. . As a result, the circular shield tunnels 81 and 82 constructed in advance are connected to the roof shields 83 and 84 constructed downstream.
As a result, a large tunnel similar to the conventional triple MF method can be constructed.
[0031]
In addition, this invention is not limited to a present Example, Arbitrary deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, in this embodiment, the female and male segments 10 and 20 are made of the steel segment 50, but the present invention is not limited to this. For example, an RC (steel reinforced concrete) segment ( (Not shown) may be configured. FIG. 3B shows a female connection member 111 provided in a female segment 110 made of RC. The female connection member 111 is constituted by a recess 113 provided on the ground mountain side inside the segment main body 112 and a metal plate 114 disposed so as to cover the inner surface thereof.
In this embodiment, a steel plate is exemplified as a material for forming the female and male connection members 11 and 21. However, the present invention is not limited to this, and it may be lightweight and have a predetermined strength and toughness. Any material may be used. For example, it may be a plastic molded with a resin such as vinyl chloride, or ceramic.
[0032]
【The invention's effect】
According to the first aspect of the present invention, the first tunnel configured to include the female segment is constructed, and then the male connection member is engaged with the female connection member provided in the first tunnel. Thus, the first tunnel and the second tunnel are connected by constructing the second tunnel behind the scenes. In other words, the second tunnel is constructed by mounting the male segment so as to move the male segment in the axial direction of the first tunnel while engaging the male connection member with the female connection member of the female segment. And the connection between the second tunnel and the first tunnel can be performed. Therefore, when connecting the tunnels, it is not necessary to perform ground improvement by injecting a chemical solution or the like for the purpose of ensuring safety, and at least two or more tunnels can be easily and safely connected.
Furthermore, it is not only necessary to perform ground improvement method, but for example, it is not necessary to create a dedicated shield machine like the multi-circular MF method, and a tunnel can be constructed using a general-purpose shield machine. , They can reduce the cost.
[0033]
According to the invention described in claim 2, since the female connection member and the male connection member are provided so as to extend in the axial direction of the tunnel, the connection between the female segment and the male segment is strong. become. Therefore, the two tunnels can be firmly connected.
[0034]
According to the third aspect of the present invention, since the female connection member and the male connection member are metal-formed, the connection between the female segment and the male segment becomes stronger. Therefore, the two tunnels can be connected more firmly.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view illustrating an entire tunnel connection segment.
FIG. 2 is a schematic perspective view showing a steel segment.
3 is a cross-sectional view of the main part of the female connection member provided in the female segment; FIG. 3A is a main part of the female connection member provided in the steel segment body of FIG. 2; It is sectional drawing, (b) is principal part sectional drawing of the female type | mold connection member provided in the segment main body made from RC.
FIG. 4 is a diagram showing a tunnel construction method constructed using tunnel connection segments, (a) is a construction method that replaces the MMST method, and (b) is a construction method that replaces the triple MF shield method. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tunnel connection segment 10 Female segment 11, 111 Female connection member 12, 22 Segment main body 20 Male segment 21 Male connection member 50 Segment

Claims (3)

A tunnel connection method for connecting tunnels composed of a plurality of segments for mounting the inner surface of an underground cavity formed by excavating natural ground using a female segment and a male segment,
A concave female connection member is provided on the natural ground side inside the female segment,
A portion of the male segment on the ground mountain side is provided with a substantially T-shaped male connecting member that engages with the female connecting member by moving in the axial direction of the tunnel,
First, a first tunnel configured to include the female segment is constructed, and then the male segment is engaged while the male connection member is engaged with the female connection member provided in the first tunnel. By moving the first tunnel in the axial direction of the first tunnel to construct a second tunnel including the male segment, thereby connecting the first tunnel and the second tunnel. Tunnel connection method. The tunnel connection method according to claim 1,
The female connection member and the male connection member are provided so as to extend in the axial direction of the tunnel. In the tunnel connection method according to claim 1 or 2,
The method for connecting tunnels, wherein the female connection member and the male connection member are formed of metal.

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