Tunnel connection structure

Abstract

The present invention provides a tunnel connection structure that can reliably connect two parallel tunnels. [Solution] A tunnel connecting structure comprising two parallel tunnels and a connecting member 4 positioned to penetrate the linings of both tunnels, wherein each tunnel comprises a lining and concrete filling the space enclosed by the lining, one end of the connecting member 4 is fixed to the concrete of one tunnel, and the other end of the connecting member 4 is fixed to the concrete of the other tunnel.

Description

Technical Field

[0001] The present invention relates to a tunnel connection structure for connecting adjacent tunnels.

Background Art

[0002] Numerous methods for constructing a large underground space by arranging multiple tunnels in parallel have been proposed. For example, in Patent Document 1, after forming a radial space in a direction orthogonal to the tunnel axis from an existing tunnel, a cylindrical outer shell portion surrounding the existing tunnel is formed by successively connecting annular tunnels formed from the side walls of this radial space, and a method for constructing a large cross-section underground space is disclosed in which the portion surrounded by the cylindrical outer shell portion is excavated to form a large cross-section underground space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] If adjacent tunnels can be connected, a highly strong structure can be formed. However, when attempting to connect tunnels by welding or bolts and nuts, there is a possibility that construction errors of each tunnel cannot be absorbed. In particular, when constructing a tunnel having a curved section by a propulsion method, overexcavation and construction errors tend to increase, so that joining of adjacent tunnels arranged in parallel tends to become difficult. An object of the present invention is to provide a tunnel connection structure that can reliably connect two adjacent tunnels arranged in parallel.

Means for Solving the Problems

[0005] The present invention, for solving the above problem, is a tunnel connecting structure comprising two parallel tunnels and a connecting member positioned to penetrate the linings of both tunnels, wherein each tunnel comprises a lining and concrete filling the space enclosed by the lining, and one end of the connecting member is connected to one of the tunnels It protrudes into the interior space and fills the tunnel. The connecting member is fixed to the concrete, and the other end of the connecting member is the other end of the tunnel It protrudes into the interior space and fills the tunnel. It is fixed to the aforementioned concrete.

[0006] With this tunnel connection structure, tunnels are connected to each other via connecting members fixed to the concrete filled inside the tunnels, thus reliably connecting them without the need for welding or bolts. Since the connecting members are horizontally installed in both tunnels, the tunnels can be joined while absorbing construction errors.

[0007] Furthermore, if the connecting member has a columnar portion, it is desirable that the anchoring length of the connecting member to the concrete be greater than or equal to the maximum width dimension of the columnar portion. It is also desirable that the columnar portion be made of a concrete-filled steel pipe. Moreover, if the connecting member has a flange portion formed at the end of the columnar portion, the tunnels can be joined together more securely. [Effects of the Invention]

[0008] According to the tunnel connection structure of the present invention, two tunnels arranged side by side can be reliably connected. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view showing the underground structure of this embodiment. [Figure 2] This is a longitudinal section of an underground structure. [Figure 3] This is a flowchart showing the steps involved in constructing an underground structure. [Figure 4] This is a cross-sectional view showing the tunnel construction status. [Figure 5]This is a cross-sectional view of the tunnel connecting structure. [Figure 6] (a) is a cross-sectional view AA in Figure 5, and (b) is a cross-sectional view BB in Figure 5. [Modes for carrying out the invention]

[0010] This embodiment describes the case in which an underground structure 1 having a large cross-sectional underground space surrounding an existing tunnel is formed. Figure 1 shows the underground structure 1. As shown in Figures 1 and 2, the underground structure 1 is formed in a cylindrical shape by connecting two annular tunnels 13 that surround the existing tunnel 10, which consists of a ramp tunnel 11 and a main line tunnel 12, in the axial direction of the existing tunnel 10. Both ends of the underground structure 1 are shielded by retaining walls 14, 14. The underground structure 1 is used as a construction base for auxiliary construction methods (shield tunneling, pipe roofing, ground improvement, freezing method, etc.) for widening the existing tunnel 10 without excavation.

[0011] Figure 3 shows the procedure for the construction method of underground structure 1. As shown in Figure 3, the construction method of underground structure 1 comprises a shaft formation process S1, an annular tunnel construction process S2, a connecting member placement process S3, a concrete filling process S4, an earth retaining wall formation process S5, and an excavation process S6.

[0012] Figure 4 shows the shaft formation process S1 and the ring tunnel construction process S2. In the shaft formation process S1, as shown in Figure 4, the shaft 15 is formed using the existing tunnel 10 (ramp tunnel 11 in this embodiment).

[0013] In the annular tunnel construction process S2, the shaft 15 is used as the launching and receiving shaft, and the annular tunnel 13 is constructed using the tunnel jacking method. In this embodiment, two annular tunnels 13, 13 are constructed in sequence (see Figure 2). As shown in Figure 4, the annular tunnel 13 is formed by sequentially pushing multiple tunnel jacking boxes 2, 2, ... into the ground using a main thrust jack J1 installed in the shaft 15. Since the annular tunnel 13 is curved and has a large tunnel length, the thrust of the main thrust jack J1 is not sufficiently transmitted to the tunnel tip. Therefore, tunnel jacking devices (such as tunneling machines M and intermediate thrusting devices J2) are installed at appropriate locations along the tunnel axis during construction. For this reason, a special lining 3, different from the tunnel jacking boxes 2, is provided in the parts of the completed annular tunnel 13 corresponding to the tunnel jacking devices.

[0014] Figures 5 and 6 show the jacking box 2 of this embodiment. As shown in Figure 5, the jacking box 2 is a steel shell with a rectangular cross-section. As shown in Figures 5 and 6, the jacking box 2 of this embodiment comprises a main girder 21 formed in a frame shape by combining steel materials, longitudinal ribs 22 interposed between axially adjacent main girders 21, an outer shell 23 covering the outer surface of the main girders 21, and support columns 24 erected inside the jacking box 2. Note that the configuration of the jacking box 2 is not limited; for example, the support columns 24 may be provided as needed. Also, the cross-sectional shape of the jacking box 2 is not limited.

[0015] In the connecting member placement process S3, as shown in Figure 5, the connecting member 4 is placed across the two parallel annular tunnels 13, 13. The connecting member 4 is positioned so as to penetrate the lining of the annular tunnels 13, 13. That is, one end of the connecting member 4 protrudes into the interior of one annular tunnel 13, and the other end of the connecting member 4 protrudes into the interior of the other annular tunnel 13.

[0016] The connecting member 4 is composed of a columnar portion 41 and an end plate 42 fixed to the end of the columnar portion 41. As shown in Fig. 6(b), the columnar portion 41 is formed of a cylindrical body having a rectangular cross-sectional shape. The columnar portion 41 of the present embodiment is formed by combining steel plates, but the configuration of the columnar portion 41 is not limited. For example, it may be a steel pipe. Further, the cross-sectional shape of the columnar portion 41 is not limited, and for example, it may be circular.

[0017] As shown in Figs. 5 and 6(a), the end plate 42 is made of a steel plate having an outer shape larger than the cross-sectional shape of the columnar portion 41. The edge portion of the end plate 42 protrudes from the outer surface of the columnar portion 41 to form a flange portion 43. As shown in Fig. 6(a), a through-hole 44 is formed in the center of the end plate 42.

[0018] When arranging the connecting member 4, first, the ground around the annular tunnels 13, 13 is frozen. Next, the lining (skin plate) and the backfill material of the annular tunnel corresponding to the connecting member 4 are removed. Then, the connecting member 4 is arranged.

[0019] In the concrete filling step S4, the annular tunnel 13 is filled with concrete. At this time, the inside of the connecting member 4 is also filled with concrete through the through-hole 44 of the end plate 42. In this way, the columnar portion 41 becomes a concrete-filled steel pipe. One end of the connecting member 4 is fixed to the concrete filled in one annular tunnel 13, and the other end of the connecting member 4 is fixed to the concrete filled in the other annular tunnel 13. Thereby, a tunnel connection structure for connecting the cylindrical bodies (annular tunnels 13, 13) of two steel plate concrete structures (SC structures) is formed. In the present embodiment, the connecting member 4 is projected from the lining (propelling casing 2) of the annular tunnel 13 to the inner space side so that the fixing length of the connecting member 4 with respect to the concrete is not less than the maximum width dimension of the columnar portion 41.

[0020] In the earth retaining wall forming step S5, earth retaining walls 14 are formed at both ends of the inner space surrounded by the annular tunnel 13 (see Fig. 2). In excavation process S6, excavation is carried out within the space surrounded by the ring tunnels 13,13 and the retaining walls 14,14.

[0021] According to this embodiment, the annular tunnels 13 are connected to each other via connecting members 4 fixed to the concrete filled inside the annular tunnels 13, so that the annular tunnels 13 can be reliably connected to each other without requiring welding or bolts. Since the connecting members 4 are horizontally mounted on the annular tunnels 13, 13, the tunnels can be joined together while absorbing construction errors.

[0022] The connecting member is anchored to the concrete with an anchorage length exceeding the maximum width dimension of the columnar section, thus ensuring the desired anchorage. Furthermore, since flange portions are formed at the ends of the connecting members, tunnels can be joined together more securely.

[0023] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and each of the above-mentioned components can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the case of connecting two annular tunnels 13, 13 surrounding an existing tunnel was described, but the shape of the tunnels connected using the connecting member 4 is not limited, and for example, they may be straight tunnels.

[0024] Furthermore, the purpose of connecting tunnels is not limited to forming large-span underground structures. The tunnel construction method is not limited to the pipe jacking method; for example, the shield tunneling method may also be used. The anchoring length of the connecting member 4 is not limited and can be determined as appropriate. The flange portion can be formed as needed. The dimensions of the flange portion can also be determined as appropriate. [Explanation of Symbols]

[0025] 1 Underground structure 10 Existing tunnels 11 Ramp Tunnel 12 Main Line Tunnel 13 Ring Tunnel 14. Retaining wall 15. Shaft 2 Propulsion box (lining) 21 Main girder 22 Vertical ribs 23 Outer shell 24 Posts 3 Special lining 4 Connecting members 41 Columnar part 42 End Plates 43 Flange section 44 Through holes

Claims

1. Two tunnels running parallel to each other, A tunnel connecting structure comprising a connecting member positioned to penetrate the linings of both tunnels, Each of the aforementioned tunnels comprises a lining and concrete filled in the space enclosed by the lining. One end of the connecting member protrudes into the interior of one of the tunnels and is fixed to the concrete filled in the tunnel. A tunnel connecting structure characterized in that the other end of the connecting member protrudes into the interior of the other tunnel and is fixed to the concrete filled in the tunnel.

2. The connecting member has a columnar portion, The tunnel connection structure according to claim 1, characterized in that the anchoring length of the connecting member to the concrete is greater than or equal to the maximum width dimension of the columnar portion.

3. The tunnel connecting structure according to claim 2, characterized in that the columnar portion is made of a concrete-filled steel pipe.

4. The tunnel connecting structure according to claim 2 or 3, characterized in that the connecting member has a flange portion formed at the end of the columnar portion.

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