JP2011074570A - Method for constructing tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily adjust an error between main-line and branch-line tunnels in the widened section and confluent section of the tunnel. <P>SOLUTION: In this method for constructing the tunnel, a steel frame 75 elongated toward an end of the other segment 9 from an end of one 6 of opposed segments is provided in a section where the lining segment 6 and the connecting segment 9 face each other; adjusting plates 71 and 72 elongated toward the end of the one segment 6 from the end of the other segment 9 are provided in the section, and arranged on the periphery of the steel frame 75; and subsequently, concrete 20 is placed between the steel frame 75 and the adjusting plates 71 and 72. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for constructing a tunnel having a tunnel widening portion such as a junction, a branching portion, or an emergency parking zone such as a road tunnel.

  The present applicant has proposed a technique for constructing a widened portion in a tunnel cross section using a shield machine provided with a widening cutter that can protrude from the peripheral surface of the main body (see Patent Document 1).

  In addition, the present applicant has proposed a technology for constructing a junction between a main tunnel and a branch tunnel (see Patent Document 2). Specifically, in the section of the junction, the main tunnel and the branch tunnel are dug so as to be close to each other, and a substantially circular lining including a segment with a protrusion at the upper part and the lower part is assembled. Next, the projections of the segments with projections are extruded to form projections on the upper and lower portions of the main tunnel and the branch tunnel. Then, a steel shell is attached so as to be bridged between these protrusions, and the space between the steel shell and the lining is filled with a filler to integrate the lining of the main tunnel and the branch tunnel. And the envelope of the cross section of the lining consisting of the branch tunnel and steel shell is constructed so as to be almost circular. According to this, without cutting from the ground, it is not necessary to devise the shield machine, and it is possible to reduce their costs. In addition, the merging part of the shield tunnel can be constructed while using the merged main tunnel.

JP 2005-54528 A JP 2008-14076 A

  By the way, an error in the tunnel length direction, an error in the tunnel width direction, an error in the vertical direction, and an error due to rolling occur between the main tunnel and the branch tunnel.

  The subject of this invention is providing the construction method of the tunnel which can adjust easily the difference | error between a main line tunnel and a branch tunnel in the widening part and confluence | merging part of a tunnel.

  In order to solve the above-mentioned problems, the invention described in claim 1 is a tunnel construction method, in which a hollow portion is formed by excavating the underground between the main tunnel and the branch tunnel lining that are dug in parallel. After forming, a connecting segment is arranged between the main line tunnel and the upper lining segment of the branch tunnel, and a connecting segment is arranged between the main line tunnel and the lower lining segment of the branch tunnel, and the lining In a facing portion between the segment and the connecting segment, a steel frame extending from an end portion of one opposing segment toward an end portion of the other segment is provided, and the end of the one segment is extended from the end portion of the other segment. An adjustment plate extending toward the end is provided, the adjustment plate is arranged around the steel frame, and then a control plate is disposed between the steel frame and the adjustment plate. Characterized by pouring the REIT.

  Invention of Claim 2 is the construction method of the tunnel of Claim 1, Comprising: While arrange | positioning a 1st adjustment board along the outer peripheral surface of a tunnel lining, on the inner peripheral surface of a tunnel lining A second adjustment plate is disposed along the steel plate, and the steel frame is disposed between the first adjustment plate and the second adjustment plate.

  Invention of Claim 3 is the construction method of the tunnel of Claim 1, Comprising: The said adjustment board is provided in cross-sectional substantially C shape, The said steel frame is arrange | positioned in the center part of the said adjustment board, It is characterized by the above-mentioned. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the error between a main line tunnel and a branch line tunnel can be easily adjusted in the widening part and confluence | merging part of a tunnel.

The structure of one Embodiment to which this invention is applied is shown, and it is the schematic front view which showed the integrated lining of the tunnel merge part. It is explanatory drawing which shows the construction method of a tunnel junction part. It is explanatory drawing which shows the construction method of a tunnel junction part. It is explanatory drawing which shows the construction method of a tunnel junction part. It is an enlarged view of the junction part 10 of the general segment 6 and the connection segment 9. FIG. FIG. 6 is a sectional view taken along arrow VI in FIG. 5. It is an enlarged view of the junction part 10 of the general segment 6 and the connection segment 9. FIG. FIG. 8 is a sectional view taken along arrow VIII in FIG. 7.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 shows an integrated lining of a tunnel junction as a configuration of an embodiment to which the present invention is applied. As shown in the figure, the tunnel junction includes a general segment 2 on one side that forms the main tunnel 1 and a general segment 6 on the opposite side that forms a ramp tunnel 5 that is a branch tunnel close to and parallel to the main tunnel 1. And a connecting segment 9 that connects the upper and lower sides of the general segment 2 and the general segment 6. The general segment 2, the general segment 6, and the connection segment 9 are joined by a joint 10.

The construction method of the tunnel junction will be described below. First, as shown in FIG. 2, the main tunnel 1 is formed in the ground. At this time, the main line tunnel is formed from the general segment 2 and the cutting segment 4. The cutting segment 4 is thinner than the general segment 2. The cutting segment 4 is made of a material that can be excavated by a cutter of a shield excavator that excavates the ramp tunnel 5.
Next, the partition segment 3 is installed between the upper and lower general segments 2, and an internal support (not shown) is installed in the space between the partition segment 3 and the general segment 2. In addition, the partition segment 3 is installed in the position which is not cut by the cutter of the shield excavator which excavates the ramp tunnel 5 mentioned later.
Next, the backfill material 16 is backfilled into the space between the partition wall segment 3 and the cutting segment 4.

  Next, as shown in FIG. 3, the ramp tunnel 5 is formed in the ground. At this time, the ramp tunnel 5 is formed from the general segment 6 and the removal segment 8. The cutting segment 4 is cut by a cutter of a shield excavator that excavates the ramp tunnel 5. Thereafter, an internal support and a work gantry (not shown) are also installed inside the lamp tunnel 5.

  Next, although not shown in the figure surrounding the lining of the main tunnel 1 and the lamp tunnel 5, a water-stopping chemical injection is performed in advance from the inside of the main tunnel 1 and the inside of the lamp tunnel 5. Similarly, a water-stopping chemical injection is performed in advance in the ground between the main tunnel 1 and the ramp tunnel 5. Alternatively, the ground surrounding the lining of the main tunnel 1 and the ramp tunnel 5 may be improved by a freezing method.

  Next, a part of the upper removal segment 8 is removed. Next, the upper ground between the linings of the main tunnel 1 and the ramp tunnel 5 is excavated to form a cavity for installing the connecting segment 9.

Next, as shown in FIG. 4, in the ceiling of the excavated upper cavity, a support work (not shown) is formed by long steel pipe fore-piling construction, and the connecting segment 9 is arranged at the lower part of the support work. Thereafter, the general segments 2 and 6 and the connecting segment 9 are connected.
Similarly, the general segments 2 and 6 and the connecting segment 9 are connected at the bottom of the excavated cavity.

  Thereafter, the internal support work, the work gantry, the removal segment 8 and the bulkhead segment 3 are completely removed. Thus, the widened portion of the tunnel is constructed as shown in FIG.

Here, a connection structure between the general segment 6 and the connecting segment 9 will be described.
FIG. 5 is an enlarged view of the joint 10 between the general segment 6 and the connecting segment 9 according to the first embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the arrow VI in FIG. As shown in FIG. 5, at the end of the connecting segment 9 on the general segment 6 side, steel adjustment plates 71 and 72 are respectively provided from the tunnel outer peripheral side and the tunnel inner peripheral side toward the end of the general segment 6 side. It protrudes. Steel plate dowels 73 and 74 are provided on the inner surface of the adjustment plate 71 on the outer periphery side of the tunnel and the outer surface of the adjustment plate 72 on the inner periphery side of the tunnel, respectively.

As shown in FIG. 6, the adjusting plates 71 and the adjusting plates 72 adjacent to each other in the tunnel length direction are joined to each other. As a joining method, there are methods such as welding and bolt fastening. Or you may connect by a coupling.
In FIG. 6, the lengths of the general segment 6 and the connecting segment 9 in the tunnel length direction correspond to the lengths of the two adjusting plates 71 and 72.

From the end of the general segment 6 on the connection segment 9 side, an H-section steel 75 projects toward the connection segment 9. A steel plate dowel 76 is provided on the web portion of the H-shaped steel 75. The H-shaped steel 75 is disposed between the adjusting plates 71 and 72. Although not shown, a shear reinforcing bar is provided between the adjustment plates 71 and 72 and the H-shaped steel 75.
Concrete 20 is placed between the general segment 6 and the connecting segment 9. By placing the concrete 20, the compressive stress acting between the general segment 6 and the connecting segment 9 can be counteracted. Further, since the steel plate gibels 73, 74, 76 are embedded in the concrete 20, it is possible to resist the tensile stress acting between the general segment 6 and the connecting segment 9.

  Hereinafter, the connection method of the general segment 6 and the connection segment 9 is demonstrated. First, the H-section steel 75 is arranged toward the connecting segment 9 side at the facing portion between the general segment 6 and the connecting segment 9. Next, the adjustment plates 71 and 72 are attached to the end of the connecting segment 9. Thereafter, concrete 20 is placed between the general segment 6 and the connecting segment 9. The concrete 20 is placed not only between the adjusting plates 71 and 72 but also between the ends of the adjusting plates 71 and 72 and the general segment 6.

  In addition, since the joining structure of the general segment 2 and the connection segment 9 is the same as the joining structure of the general segment 6 and the connection segment 9, description is omitted.

  Here, a method for absorbing an error between the main tunnel 1 and the lamp tunnel 5 according to the present invention will be described. Between the main tunnel 1 and the ramp tunnel 5, an error in the tunnel length direction, an error in the tunnel width direction, an error in the vertical direction, and an error due to rolling are generated.

  In the present invention, the error in the tunnel length direction can be adjusted by shifting the relative positions of the adjusting plates 71 and 72 and the H-shaped steel 75 in the tunnel length direction. The error in the tunnel width direction can be adjusted by shifting the positions of the adjusting plates 71 and 72 and the H-shaped steel 75 in the tunnel width direction. Similarly, errors in the vertical direction and errors due to rolling can also be adjusted by shifting the positions of the adjustment plates 71 and 72 and the H-section steel 75.

  As described above, in the lining of the main tunnel 1 and the ramp tunnel 5, after excavating the underground between them and excavating the underground of the upper and lower general segments 2 and 6 to form the cavity, By connecting the connecting segments 9 between the general segments 2 and 6, respectively, it is possible to construct an elliptical tunnel junction that is resistant to external pressure as shown in FIG. it can.

[Second Embodiment]
FIG. 7 is an enlarged view of the joint portion 10 between the general segment 6 and the connecting segment 9 according to the second embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along arrow VIII in FIG. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is omitted.

  In the present embodiment, as shown in FIG. 8, a web-like adjustment plate 77 that connects one end of the adjustment plate 71 and the adjustment plate 72 is further provided, and is formed in a substantially C-shaped cross section as a whole. The H-shaped steel 75 is surrounded by the adjusting plates 71, 72, 75, and is disposed at the center of the substantially C-shaped cross section. By providing the adjusting plate 77, the shear strength is improved, so that the number of shear reinforcing bars can be reduced.

In addition, in the above embodiment, although the case where the H-section steel 75 was used as a steel frame was demonstrated, the steel frame of arbitrary shapes can be used.
In the second embodiment, the adjustment plate having a substantially C-shaped cross section is provided as a whole. However, the present invention is not limited to this. For example, a web-like adjustment connecting the adjustment plate 71 and the adjustment plate 72 at the central portion. A plate may be provided.

1 Main line tunnels 2 and 6 General segment 4 Cutting segment 5 Branch line tunnel 8 Removal segment 9 Connection segment 20 Concrete 71, 72, 77 Adjusting plates 73, 74, 76 Steel plate dowel 75 H-section steel (steel frame)

Claims (3)

After excavating the underground between the lining of the main line tunnel and the branch line tunnel excavated substantially in parallel, a connecting segment is arranged between the lining segments at the upper part of the main line tunnel and the branch line tunnel. , A connecting segment is arranged between the main line tunnel and the lining segment under the branch line tunnel,
In the facing portion between the lining segment and the connecting segment,
While providing a steel frame extending from the end of one opposing segment toward the end of the other segment,
An adjustment plate extending from the end of the other segment toward the end of the one segment;
Placing the adjusting plate around the steel frame;
Thereafter, concrete is placed between the steel frame and the adjusting plate. A first adjusting plate is arranged along the outer peripheral surface of the tunnel lining, and a second adjusting plate is arranged along the inner peripheral surface of the tunnel lining,
The tunnel construction method according to claim 1, wherein the steel frame is disposed between the first adjustment plate and the second adjustment plate. The adjustment plate is provided with a substantially C-shaped cross section,
The tunnel construction method according to claim 1, wherein the steel frame is disposed in a central portion of the adjustment plate.

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