JP2007002574A - Underground passage between shielded tunnels and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow the economical construction of an underground passage between shielded tunnels by reducing an excavation quantity of the ground by miniaturizing a hollow body for regulating a passage space. <P>SOLUTION: This underground passage is arranged between the two shielded tunnels extending in substantially parallel at an interval, communicates with both tunnels, and is composed of the hollow body regulating the passage space and a reinforcing structure reinforcing the hollow body. The hollow body is joined to a first opening formed on the side wall of one shielded tunnel on one side of the passage space, and joined to a second opening formed on the side wall of the other shielded tunnel on the other side of the passage space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an underground passage between shield tunnels and a construction method thereof.

  An underground passage connecting the main shield tunnel and the lamp shield tunnel is constructed at the junction or branch of the underground road tunnel to connect the main shield tunnel and the lamp shield tunnel.

Conventionally, as a construction method to construct an underground passage between two shield tunnels, after improving the ground between the two shield tunnels using an improving agent such as a freezing agent, the ground is excavated to define the passage space There is one that constructs a hollow body (see, for example, Patent Document 1).
JP-A-4-281990

  However, the hollow body constructed by the above construction method has a large structure in order to increase the strength against loads such as earth pressure and water pressure. Therefore, since the amount of ground excavation required to secure the passage space increases, a large construction cost and construction period are required to construct the hollow body, which is uneconomical.

  An object of the present invention is to enable economical construction of underground passages between shield tunnels by downsizing the hollow body and reducing the amount of ground excavation.

  The present invention reduces the size of the hollow body by reinforcing the strength of the hollow body with a reinforcing structure.

  According to the present invention, an underground passage between shield tunnels is an underground passage provided between two shield tunnels extending substantially in parallel with each other and communicating with both tunnels, and defining a passage space And a reinforcing structure for reinforcing the hollow body. The hollow body is coupled to a first opening provided on a side wall of one shield tunnel on one side of the passage space, and is provided on a side wall of the other shield tunnel on the other side of the passage space. 2 openings.

  The hollow body is formed of reinforced concrete, and includes a top portion, a bottom portion, and a pair of side portions that are between the top portion and the bottom portion and connect the top portion and the bottom portion.

  The reinforcing structure includes an upwardly projecting upper arch member disposed at the top of the hollow body along the axial direction of the shield tunnel and fixed to each end of the side of the hollow body, and the upper arch An upper connecting member that connects the member and the top of the shield tunnel or the lining of the shield tunnel in the vicinity of the top.

  The reinforcing structure may include the upper arch member and the upper connecting member, and a top reinforcing member that is disposed along the axial direction of the shield tunnel and that is introduced with tension may be provided on the top of the hollow body.

  The reinforcing structure includes the upper arch member and the upper connecting member, and is arranged at the bottom of the hollow body along the axial direction of the shield tunnel and fixed to each end of the side of the hollow body. A downwardly projecting lower arch member, and a lower connecting member that connects the lower arch member and the bottom portion or the shield tunnel in the vicinity of the bottom portion can be provided.

  The reinforcing structure includes the upper arch member, the upper connecting member, the lower arch member, and the lower connecting member. The bottom of the hollow body is disposed along the axial direction of the shield tunnel and tension is introduced. An improved bottom reinforcement can be provided.

  In the construction method of the underground passage according to the present invention, a first opening is provided on the side wall of one shield tunnel, a second opening is provided on the side wall of the other shield tunnel, and then between the two shield tunnels. Excavating the ground between the first opening and the second opening so as to provide a space, and the top of the hollow body coupled to the first opening and the second opening in the space And the bottom portion is made of cast-in-place concrete or precast concrete, and then one end of the upwardly projecting upper arch member is fixed to one end of the top portion and the other end is fixed to the other end of the top portion, One end of the upper connecting member is fixed to the upper arch member, and the other end is fixed to the top or the shield tunnel lining near the top, and then the top of the hollow body and the front The sides connecting the bottom and forming a cast-in-place concrete.

  According to the present invention, by reinforcing the strength of the hollow body against the load by the reinforcing structure, the hollow body can be reduced in size and the excavation amount of the ground can be reduced. Thereby, this invention enables the economical construction of the underground passage between shield tunnels.

  Referring to FIGS. 1 and 2, an underground passage 14 is provided between two shield tunnels 10 and 12 that extend substantially parallel to each other at an interval, and communicates with both tunnels. The underground passage 14 has a passage space 16, and the passage space includes a first opening 18 provided in a side wall of one shield tunnel 10 and a second opening 20 provided in the other shield tunnel 12. It is formed by the joined hollow body 22. The hollow body 22 is reinforced by a reinforcing structure 24.

  In the example shown in FIGS. 1 and 2, the hollow body 22 has a top portion 26, a bottom portion 28, and a pair of side portions 30 between the top portion 26 and the bottom portion 28 and connecting the top portion 26 and the bottom portion 28, The cross section of the passage space 16 formed by these is rectangular. The cross section of the passage space 16 may be another polygon such as a pentagon, a hexagon, an ellipse, or a bowl instead of a rectangle.

When the underground passage 14 shown in FIGS. 1 and 2 is constructed, the ground between the two shield tunnels 10 and 12 is excavated. Prior to this excavation, the ground 31 (FIG. 3) between the two shield tunnels 10 and 12 is improved by injecting the chemical solution in a range that takes into account the size of the underground passage to be constructed later.
Next, as shown in FIG. 4, a pair of girder groups 31 a and 31 a ′ are press-fitted into the ground 31 between the shield tunnels 10 and 12 with a vertical interval. This press-fitting is performed by press-fitting each of a plurality of shaped steel girders constituting each girder group with a hydraulic jack (not shown). In each digit group 31a, 31a ', the digits are press-fitted at intervals. Further, the depth range of each girder group 31a, 31a 'corresponds to the length of one ring of the segments constituting the lining of each shield tunnel 10, 12. The girders of each girder group 31a, 31a 'are fixed to the lining of the shield tunnels 10, 12 at their ends.
Thereafter, as shown in FIG. 5, a deformation prevention work A that is a support work for the girder groups 31 a and 31 a ′ and the shield tunnels 10 and 12 is provided. The deformation prevention work A is arranged in each shield tunnel 10 and 12 and includes a pair of pillars 31b and 31b ′ and horizontal members 31c and 31c ′ that connect the pillars. In each shield tunnel 10, 12, the upper column group 31 a and the lower beam group 31 a ′ are coupled to one column 31 b, and the end of the column 31 b is connected to each shield tunnel 10, 12. Secure to the lining of the. Further, the end of the other pillar 31b ′ is fixed to the lining of each shield tunnel 10, 12. Next, the horizontal members 31c and 31c ′ are arranged in the shield tunnels 10 and 12 with a space therebetween in the vertical direction, the upper horizontal member 31c is connected to the pillars 31b and 31b ′, and the lower horizontal member 31c ′. Are connected to the columns 31b and 31b ′.
Next, as shown in FIG. 6, a plurality of sheet piles 31d are arranged on the upper surface of the upper girder group 31a and the lower surface of the lower girder group 31a ′, respectively. Thereafter, under the support by the deformation prevention work A, the segment between the two girder groups 31a and 31a ′ is removed, and the ground between them is excavated.
Similarly, for each ring of segments, the girder groups 31a and 31a ′, the columns 31b and 31b ′, the horizontal members 31c and 31c ′ and the sheet pile 31d are used to prevent the shield tunnel and the ground from collapsing, while the segments are removed. And excavating the ground. In this way, as shown in FIGS. 1 and 2, the first opening 16 is provided on the side wall of one shield tunnel 10, and the second opening 18 is provided on the side wall of the other shield tunnel 12. The ground between 16 and the second opening 18 is excavated to provide a space between the two shield tunnels 10 and 12. Next, in this space, the top part 26 and the bottom part 28 of the hollow body 22 connected to the first opening 16 and the second opening 18 are formed by cast-in-place concrete. Further, the top portion 26 and the bottom portion 28 can be formed using precast concrete instead of the cast-in-place concrete.

  Thereafter, the reinforcing structure 24 is constructed. First, an upwardly projecting upper arch member 32 is arranged on the top 26 along the axial direction of the shield tunnels 10 and 12 by a propulsion method, and then one end of the upper arch member 32 is placed on one end of the top 26 and the other The end is fixed to the other end of the top portion 26. The upper arch member 32 is made of reinforced concrete or steel, and has a circular or rectangular hollow cross section.

  Next, an upper arch is formed in each of a plurality of leading holes (not shown) provided by the small-diameter propulsion method between the upper arch member 32 and the cover of the top tunnel 26 or the shield tunnels 10 and 12 near the top. An upper connecting member 34 for connecting the member 32 and the top portion 26 or the covering of the shield tunnels 10 and 12 in the vicinity of the top portion is inserted, and one end thereof is connected to the upper arch member 32 and the other end is connected to the top portion 26 or the vicinity of the top portion 26. It is fixed to the lining of the shield tunnels 10 and 12, respectively. The upper connecting member 34 is a rod-shaped steel material such as a shape steel or a steel bar, or a wire rope.

  In accordance with the load acting on the hollow body 22, tension is introduced into the top reinforcing member 36 disposed along the axial direction of the shield tunnels 10, 12 at the top 26. The top reinforcing member 36 is a PC steel material such as a PC steel rod or a PC steel wire.

  Similarly, similarly to the upper arch member 32, a downwardly projecting lower arch member 38 is provided on the bottom portion 28 according to the load acting on the hollow body 22, and similarly to the upper connecting member 34, the lower arch member is provided. 38 and a bottom connecting member 40 for connecting the bottom portion 28 or the lining of the shield tunnels 10 and 12 in the vicinity of the bottom portion is provided, and, similar to the top reinforcing member 36, a tension is introduced into the bottom reinforcing member 42 disposed on the bottom portion 28. . When both the upper arch member 32 and the lower arch member 38 are provided, the lower arch member 38, the lower connecting member 40 and the bottom reinforcing member 42 are provided prior to the upper arch member 32, the upper connecting member 34 and the top reinforcing member 36. Also good. In this case, the side part 30 which connects the top part 26 and the bottom part 28 is formed afterwards with cast-in-place concrete.

  In the present invention, the hollow body 22 is supported by the upper arch member 32 via the upper connecting member 34 against a load acting on the hollow body 22 from above. The upper arch member 32 forms a tide arch together with the top 26 of the hollow body 22 and is supported on the ground below the hollow body 22. In this way, the upper arch member 32, the top portion 26 and the upper connecting member 34 reinforce the hollow body 22. Similarly, the hollow body 22 is supported by the lower arch member 38 via the lower connecting member 40 against a load acting on the hollow body 22 from below. The lower arch member 38 forms a tide arch together with the bottom 28 of the hollow body 22 and is supported by the ground on the hollow body 22. In this manner, the lower arch member 38, the bottom 28, and the lower connecting member 40 reinforce the hollow body 22.

  By reinforcing the hollow body 22 against the load from above on the hollow body 22 by the upper arch member 32, the upper connecting member 34 and the top reinforcing member 36, the strength of the hollow body 22 is increased and the size of the hollow body 22 is reduced. Can do. Further, the hollow body 22 is reinforced against the load from below on the hollow body 22 by the lower arch member 38, the lower connecting member 40, and the bottom reinforcing member 42, thereby further increasing the strength of the hollow body 22 and further reducing the size. Enable. As a result, the amount of ground excavation can be further reduced, enabling more economical construction of underground passages between shield tunnels.

The perspective view of the underground passage between shield tunnels. AA sectional drawing of an underground passage between shield tunnels. Sectional drawing of the shield tunnel after improving the ground. Sectional drawing of the shield tunnel after press-fitting a girder group. Sectional drawing of the shield tunnel after providing a deformation prevention work. Sectional drawing of the shield tunnel after arranging a sheet pile and excavating a segment and the ground.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 12 Shield tunnel 14 Underground passage 16 Passage space 18 1st opening part 20 2nd opening part 22 Hollow body 24 Reinforcement structure 26 Top part 28 Bottom part 30 Side part 32 Upper arch member 34 Top connection material 36 Top reinforcement member 38 Lower arch Member 40 Lower connecting member 42 Bottom reinforcing member

Claims (8)

  An underground passage provided between two shield tunnels extending substantially in parallel at an interval and communicating with both tunnels, the hollow passage defining a passage space, and a reinforcing structure for reinforcing the hollow body, The hollow body is coupled to a first opening provided on a side wall of one shield tunnel on one side of the passage space, and is provided on a side wall of the other shield tunnel on the other side of the passage space. Underground passage between shield tunnels, connected to two openings.   2. The shield tunnel according to claim 1, wherein the hollow body is made of reinforced concrete and includes a top portion, a bottom portion, and a pair of side portions that are between the top portion and the bottom portion and connect the top portion and the bottom portion. Underground passage.   The reinforcing structure includes an upwardly projecting upper arch member disposed at the top of the hollow body along the axial direction of the shield tunnel and fixed to each end of the side of the hollow body, and the upper arch The underground passage between shield tunnels according to claim 1, comprising a member and an upper connecting member that connects the top part or a shield tunnel lining near the top part.   4. The underground passage between shield tunnels according to claim 3, wherein the reinforcing structure includes a top reinforcing member that is arranged along the axial direction of the shield tunnel at the top of the hollow body and into which a tension is introduced.   The reinforcing structure includes a lower arch member that protrudes downward from the bottom of the hollow body along the axial direction of the shield tunnel and is fixed to each end of the side of the hollow body. The underground passage between shield tunnels according to claim 3, comprising a member and a lower connecting member that connects the bottom part or the shield tunnel in the vicinity of the bottom part.   6. The underground passage between shield tunnels according to claim 5, wherein the reinforcing structure includes a bottom reinforcing member that is disposed along the axial direction of the shield tunnel at the bottom of the hollow body and into which a tension is introduced. A method for constructing an underground passage comprising a hollow body and a reinforcing structure for the hollow body, which is provided between two shield tunnels extending substantially in parallel with an interval and communicates with both tunnels,
Providing a first opening on the side wall of one shield tunnel and providing a second opening on the side wall of the other shield tunnel;
Excavating the ground between the first opening and the second opening to provide a space between the two shield tunnels;
Forming in the space the top and bottom of a hollow body coupled to the first opening and the second opening by in-situ concrete or precast concrete;
Fixing one end of the upwardly projecting upper arch member to one end of the top and the other end to the other end of the top;
Fixing each one end of the plurality of upper connecting members to the upper arch member, and fixing each other end to the top of the shield tunnel near the top or the top,
A method for constructing an underground passage between shield tunnels, comprising forming a side portion connecting the top portion and the bottom portion of the hollow body with cast-in-place concrete. Between the formation of the top and bottom and the formation of the side,
Fixing one end of a downwardly projecting lower arch member to one end of the bottom and the other end to the other end of the bottom;
8. The shield tunnel according to claim 7, comprising fixing each one end of the plurality of lower connecting members to the lower arch member and fixing each other end to the bottom portion or a cover of the shield tunnel in the vicinity of the bottom portion. Construction method of underground passage between.

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