JPS63598A - Shield tunnel lining method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a shield tunnel lining method using a precast concrete slab.

(Prior art) Conventionally, when constructing a shield tunnel lining, joint fittings are provided in advance on the peripheral sides of the segments that form the tunnel, and the common method is to assemble the tunnel by tightening the fittings and connecting the segments. It was a target.

(Problems to be solved by this invention) By the way, in the conventional construction method, after assembling the segments, it is necessary to perform a secondary lining, which requires a lot of time and money, and also requires fitting fittings to be provided on the segments themselves in advance. This requires a lot of effort and expense.

This invention was developed in view of the above circumstances.

(Means for Solving Problems) The gist of the present invention is to first attach a joint fitting having a cross-sectional shape to the peripheral side edge of the segment on the inner surface of a segment made of a precast concrete slab, and then attach one side piece of the fitting to the inner surface of the segment. Make them stand up more. Next, the joint fittings of adjacent segments are tightly connected at the upright side pieces, and after the joint parts are water-tight, the joint fittings are removed from the segments. This joint fitting is further attached to the segments to be assembled at the distal end portion, and the segments are assembled by sequentially tightening them.

(Example) Hereinafter, a description will be given based on the illustrated example. 1 indicates a segment to be assembled, and two adjacent sides of this segment 1 have protrusions 1a.

Further, grooves 1b are provided on the other two adjacent side surfaces, and sealing material 1C is adhered to roughly four surrounding side surfaces.

Reference numeral 2 indicates a joint fitting used during assembly, and this joint fitting 2 has a side piece 2a for attaching to the segment 1, and a side piece 2a for attaching to the segment 1, as shown in Fig. It is formed in an L-shape, consisting of a side piece 2b for attaching the bolt, and an insert bolt hole is drilled in the side piece 2a, and a bolt hole is drilled in the side piece 2b. It is used to connect the middle parts of the side edges of segment 1.

In addition, as shown in Fig. 3, in order to simultaneously connect the middle part of the side edge of segment 1 and each corner part of the other two segments 1, 1, joint fittings 3 and 4 are used. do.

The fitting 3 has an L-shaped cross-section, and consists of a side piece 5a for attaching to the segment 1, and a side piece 3b standing up from the surface of the segment 1 and for tightly connecting the fittings together. Two side pieces 6b are placed next to each other and are L.
The insert bolt hole is provided in the side piece 3a, and the side piece 3b is provided with a bolt hole.

The fitting 4 consists of a side piece 4a for attaching to the segment 1, and a side piece 4b that stands up from the surface of the segment 1 to connect the fittings together, and the side piece 4b has three U-shaped pieces. An insert bolt hole is formed in the side piece 4a, and a bolt hole is formed in the side piece 4b.

When connecting the segments 1, first connect the segments 1 that are to be connected next to each other by inserting the protrusion 1a into the groove 1b.
A joint fitting 2 is placed at a predetermined position on the middle part of the side edge on the inner surface of each segment 1.
is attached with an insert port 5, its side piece 2a is made to stand up from the inner surface of the segment 1, side pieces 2b of adjacent segments 1 are brought into contact with each other, and are tightly connected by a port 6.

In addition, as shown in FIG. Attach the fitting 3 to its inner surface with the insert bolt 5, and -
The joint 4 is attached to the intermediate part of the side edge of the segment 1 using the insert port 5, and the side pieces 3b of the joint fitting 3 are connected to each other, and the side pieces 31:l and side pieces 4b of the joint fittings 3 and 4 are connected to each other using the port 5. We will conclude at

In addition, as shown in Fig. 4, when four segments 1 are connected at each corner, the joint 3 is connected to each segment 1.
Attach it to the corner of the
This will bring us closer together.

As described above, adjacent segments are successively connected to each other, and the key segment 7 is connected last to form a ring. In this case, the key segment 7 has projections 7a on its left and right side edges.
This protrusion 7a is inserted into the groove 1b of the segments 1, 1 to prevent it from falling, and is pushed backward from the advancing direction of the shield.

Thereafter, an injection material 8 such as an expandable segment or synthetic resin is injected through the injection hole to stop water.

After the water stop is completed, connect fittings 2 and 5.4 to segment 1.
These joint fittings 2, 5.4 are further attached to the segment 1 at the tip, and the joint fittings are tightly connected to each other.Sequentially, such operations are performed to connect the segments to form a tunnel.

(Effects of the Invention) According to this method, a tunnel can be completed without secondary lining. Moreover, since a simple joint fitting is attached to the side edge of the segment, one side piece of the joint fitting stands up from the inner surface, and the side pieces are tightly connected, the working efficiency is extremely high. In addition, the fittings are removed after stopping water and are attached to the tip segments in order to be used repeatedly, so the cost required for fittings with a simple structure is very low.
Overall, a significant reduction in construction costs can be expected.

[Brief explanation of drawings]

Figure 1 is a front view with a part of the segment omitted, Figure 2 is a perspective view showing the segment sides and green intermediate parts connected to each other with a joint metal fitting, and a perspective view showing the joint metal, and Figure 3 is a joint metal fitting. Fig. 4 is a perspective view showing the state in which the middle part of the segment and the corner part are connected with each other, and the joint fitting; FIG. 5 is a partial longitudinal sectional view, and FIG. 6 is a perspective view showing a state in which the key segments are connected. 1... Segment, 2, 3.4... Fittings, 5... Insert bolt, 6... Bolt, 7... Key segment, 8... Injection material. Figure 1 Figure 2 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] On the inner surface of the segment made of precast concrete slab, a joint fitting having an L-shaped cross section is attached to the peripheral side edge of the segment, one side piece of the joint fitting is made to stand up from the inside surface, and then the fitting fittings of adjacent segments are connected to each other in the above-mentioned upright manner. After tightening at the side pieces and waterproofing the joint area,
A shield tunnel lining method characterized by removing a fitting from a segment and attaching the removed fitting to a segment to be assembled at the tip.