JPH03260297A - Replacing method of center column in lining of multiple connected tunnel - Google Patents

Abstract

PURPOSE:To promote work efficiency by erecting temporary columns to be required in the intermediate sections of permanent center columns together with them between up and down branch segments, and removing the temporary center columns after adjacent joint members are connected to each other through splice plates. CONSTITUTION:A plurality of excavated holes 1A - 1C having approximately a circular section are combined approximately in the horizontal direction to form a multiple connected tunnel. Lining bodies 3 of segments 3A... are assembled on the peripheral walls 2 of the tunnel, and permanent center columns 8 are erected between up and down branch segments 3B... at required intervals through joint members 6... while connecting the lining bodies in the direction of the axis of the tunnel. Temporary center columns 7... to be required are erected in the intermediate section of the permanent center columns 8, together with them. After that, the temporary center columns 7... are removed after adjacent joint members 6... are connected to each other through splice plates 9... built across them.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a temporary center pillar erected between the composite sections when lining a multiple tunnel consisting of a composite of excavated holes having a substantially circular cross section. Concerning the construction method of replacing the pillar with a permanent central pillar.

[Technical Background of the Invention] In recent years, as a large-section shield construction method for constructing large-section tunnel structures such as underground railway tunnels, a method called a rear circular special section shield construction method has been used.

This construction method uses a shield excavator with a structure in which multiple cylindrical shield excavators are connected to excavate the ground into a cross-sectional shape in which several approximately circular cross-sectional excavation holes are connected. A cylindrical wall is constructed by installing segments such as RC segments that are connected to each other on the peripheral wall of the tunnel, and a plurality of these cylindrical walls are connected along the excavated hole (primary lining). The inner surface is covered with concrete (secondary lining), which supports the ground and forms a predetermined inner space. Usually, the composite part of the cylindrical wall body is provided with branch segments corresponding to the composite part, and furthermore, between the branch segments, a central column is installed as a support.

By the way, for example, in a subway tunnel, three shield excavators are connected horizontally to form an excavation hole, and the central excavation hole is used as a platform, and the excavations on both sides are used as a railway station to construct a station. In this case, the middle pillars are located on both sides of the central excavated hole and are built for each branch segment, and if these middle pillars remain as they are, they will obstruct passengers getting on and off and passing through the platform. Therefore, in place of these central pillars, while supporting the cylindrical wall,
It is necessary to erect the permanent center pillars at intervals that do not interfere with boarding and alighting or platform traffic.

However, an efficient construction method has not yet been developed for removing the center pillars that were initially erected for each segment and then erecting the main center pillars at predetermined intervals. The current situation is that

The present invention has been made in view of the above circumstances, and its purpose is to install permanent center pillars in place of temporary center pillars erected for each segment when lining multiple tunnels. An object of the present invention is to provide a method for replacing center pillars in lining a multiple tunnel, which enables efficient construction at intervals.

[Means for Solving the Problems] In order to achieve the above object, the present invention assembles a lining body made of segments to the peripheral wall of a multiple tunnel formed by combining a plurality of excavated holes with a substantially circular cross section in a substantially horizontal direction. While connecting in the axial direction of the tunnel, permanent center pillars are erected at predetermined intervals via joint members between the segments arranged in the upper and lower composite parts, and temporary center pillars are erected between them, and then, It is characterized in that the adjacent joint members are interconnected by a splicing plate extending between them, and then the temporary center pillar is removed.

[Function] The method of replacing the center pillar in the lining of a multiple tunnel according to the present invention is to connect and integrate the branch segments with a splicing plate, and then replace the temporary center pillar with the permanent center pillar remaining. By removing the main pillars, it becomes possible to efficiently replace the main pillars at predetermined intervals. This construction method has the advantage that the used and removed temporary center pillar can be reused when constructing a new cylindrical wall in front of it and erecting the center pillar.

Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Figures 1 and 2 show a large cross-section excavation hole made by combining parts of three adjacent excavation holes IA, IB, and IC using a shield excavator with a structure in which three shield excavators are connected approximately horizontally. 1 is excavated into the ground G, and its peripheral wall 2 is made up of arcuate plate-like segments 3A and branch segments 3 that are connected to each other.
A cylindrical wall body (lining body) 3 is constructed by lining B, and as the excavation hole 1 is excavated, this cylindrical wall body 3 is connected along the excavation hole 1 to form a subway station area. The tunnel is being constructed. In this tunnel, the central drill hole IA is the platform, and the drill holes IB and Ic on both sides are the platform.
is of the type used as a railway.

The branch segment 1-3B has a Y-shaped cross section and is arranged in two upper and lower composite parts 4 of the cylindrical wall 3, and the branch segments 3B adjacent to each other in the axial direction are connected to a joint fitting 5. are interconnected by.

Next, a permanent center pillar is built into the cylindrical wall body 3 according to the present invention (the procedure of the process will be explained below).

First, as shown in FIGS. 1 and 2, each time the cylindrical wall body 3 is constructed, the joint members 6 are fixed to the mutually opposing surfaces 3b of the upper and lower branch segment 3B. This joint member 6 is made of H-shaped steel with flanges 6b integrated at both ends of a thick web 6a, and is fixed with one flange 6b aligned with the opposing surface 3b of the branch segment 3B.

In addition to fixing the joint member 6 to the branch segment 3B, a temporary middle pillar 7 is installed between the upper and lower joint members 6.
Alternatively, the main pillars 8 are built in and fixed to the joint member 6.

In that case, as the cylindrical wall body 3 is constructed, the intervals between the main pillars 8 are made to be constant. In this embodiment, as shown in FIG. 2, three temporary middle pillars 7 are erected between permanent middle pillars 8.

In addition, in parallel with this operation, as shown in FIGS. 3 and 4, adjacent joint members 6 are connected to each other by a splicing plate 9 spanning between them, and furthermore, adjacent joint members 6 are The branch segments 3B are interconnected by an auxiliary plate 10 spanning between them.

The attachment plate 9 is a rectangular plate material, and is fixed to the inner surfaces of both sides of the upper and lower flanges 6b of the joint member 6 by bolting. Further, the auxiliary plate 10 is similarly made of a rectangular plate, and is fixed by bolts to both sides of the branch segment 3B. As a result, each branch segment 3B... is connected to each connecting plate 9.
. . . and each auxiliary plate 10 .

Next, as shown in FIGS. 5 and 6, in the section where the connection between the branch segments 3B by the attachment plate 9 and the auxiliary plate 10 has been completed, the temporary middle pillar 7 is removed from the joint member 6. Remove. The branch segment 1-3B... in which the temporary middle pillar 7 is installed has a structure in which they support each other by integrating the attachment plate 9 and the auxiliary plate 10 as described above. This means that the temporary middle pillar 7 can be removed.

The above steps are performed sequentially as the excavation hole l is formed and the cylindrical wall body 3 is constructed, and the main pillars 8 are installed at predetermined intervals.
It is installed between the branch segments 3B via the joint member 6.

The main pillars 8 have the strength to support the cylindrical walls 3 at predetermined intervals, and the intervals are such that they do not interfere with passengers getting on and off or passing through the platform. The distance is set to a distance that cannot be exceeded.

By the construction method described above, the permanent center pillars 8 are replaced with the temporary center pillars 7 at predetermined intervals for the cylindrical wall body 3 (this work can be carried out efficiently).

In this construction method, once the work in a certain section is completed, the temporary center pillar 7 that was used and removed at that time is reused when constructing a new cylindrical wall in front of it and erecting the center pillar. can.

7 and 8 show a state in which a joint member 11 is used in place of the joint member 6 described above.

This joint member 11 has a cross-shaped reinforcing member 11b fixed within a rectangular frame 11a, and is adapted to fix the frame 11a to the branch segment 3B. Then, like the joint member 6 described above, splice plates 9 are bridged and fixed to the upper and lower inner surfaces of the frame 11a. In addition, the joint members 11 are fixed to the branch segment 3B, and adjacent parts are brought together, and the joints are fixed with bolts or the like, thereby improving the connection strength of the branch segment 3B. .

The splicing plate 9 is made of a simple rectangular plate, but it has a U-shaped cross section, like the splicing plate indicated by the reference numeral 12 in FIG. It is also possible to use a This splice plate 12 is configured to fit the inner surface of each of the joint members 6.11, and has a double-shaped cross section, so it has the advantage of being high in rigidity and increasing the connection strength between the branch segments 3B.

[Effects of the Invention] According to the method for replacing the center pillar in lining of multiple tunnels of the present invention, a plurality of excavated holes having a substantially circular cross section are combined in a substantially horizontal direction on the peripheral wall of a multiple tunnel, While assembling the lining made up of segments and connecting them in the axial direction of the tunnel, permanent center pillars are erected at predetermined intervals between the segments arranged in the upper and lower composite parts via joint members, and temporary center pillars are installed between them. The structure is characterized in that the adjacent joint members are connected to each other by a splicing plate that spans between them, and then the temporary middle pillar is removed, so that the temporary construction It becomes possible to efficiently perform the work of replacing the main pillars from the pillars at predetermined intervals. Furthermore, in this construction method, the used and removed temporary center pillar can be reused when constructing a new cylindrical wall in front of it and erecting the center pillar.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a front view of a cylindrical wall with temporary central pillars installed, and FIG. 2 is a view similar to that of FIG. ■-■ line arrow view night view Figure 3 is a side view showing the connected state of the joint members, and Figure 4 is the IV-- of Figure 3.
Fig. 5 shows the front view of the cylindrical wall with the temporary center pillar removed, and Fig. 6 shows the night view taken from the VI-Vl line in Fig. 5. Fig. 7 shows the deformation of the joint member. Side view showing an example, FIG.
Figure 9, which is a view taken along the line ■-■ in the figure, is a front view showing a modified example of the attachment plate. 1, IA, IB, IC...Drilling hole, 2...
... Peripheral wall, 3... Cylindrical wall body (lining body), 3A.
... Segment, 3B ... Branch segment, 4 ... Composite section, 6.11 ... Joint member, 7 ... Temporary middle pillar , 8...Main pillar, 9.12...Applicable plate, G...Ground.

Claims (1)

[Claims] A lining made of segments is assembled on the peripheral wall of a multiple tunnel made up of a plurality of excavated holes with a substantially circular cross section in a substantially horizontal direction, and connected in the axial direction of the tunnel. Permanent center pillars are erected at predetermined intervals via joint members, and temporary center pillars are erected in between, and then the adjacent joint members are connected by connecting plates that span between them. A method for replacing center pillars in lining a multiple tunnel, characterized in that the temporary center pillars are interconnected and then removed.