JPS6160239B2 - - Google Patents

Description

[Detailed description of the invention] The present invention involves excavating a tunnel using the shield method.
This invention relates to a method for stopping water in tunnel lining segments during lining.

A conventional method for water-stopping of segments was to insert packing directly between the main girder part of the segment and the flat part of the joint part, but this was because the back pressure of the shield jack was applied to each segment alone. Lack of restorability of the packing due to falling of the packing from the flat section and loosening of the segments, although this is allowed to some extent within the area of the flat section due to strain applied to the tunnel, or displacement between adjacent segments due to external pressure of the tunnel, etc. In addition, it was not possible to sufficiently prevent water from flowing in the circumferential direction of the tunnel due to misalignment or gaps in the packing caused by various vibrations after the tunnel lining was constructed. Therefore, in order to hold the packing in the flat part, a wide long groove is provided in the longitudinal direction of the main girder part and the joint part, and adhesive packing is pasted to it, and the packing itself is installed in this wide long groove. Various forms have also been considered. However, the mainstream of these systems focuses on how the packing installed in the wide long groove can exhibit a water-stopping effect within the groove. This was done based on the premise that the segments used in the shield construction method must be provided in such a way that they can sufficiently withstand the external pressure of jacks, earth, mortar, etc.

The present invention was made based on a different idea from the past, and its main focus is to enable conventional packing with adhesive properties to be used as is, but especially for the segments. It was devised so that the main girder and the flat parts of the joints can exhibit a sufficient water-stopping effect. For this reason, the present invention features flat main girder and joint parts that do not cause damage or wear even if the segments are misaligned or subjected to external pressure, and also enable double or triple water stoppage against external water pressure. The aim is to provide a method for shutting off water in the area.

The present invention has been made in accordance with the above objects, and
The gist is that in the method of joining the main girder part of the segment and the joint part with bolts and nuts, first, a wide long groove with a wide opening provided in the flat part of the main girder part and the joint part is filled with adhesive. , and then tightening each segment to be joined with bolts and nuts, thereby sealing the packing between the wide long grooves between the openings of each joined segment,
In the longitudinal direction of the wide long groove, a protruding edge consisting of a plurality of parallel peaks and troughs lower than the flat part of the main girder part and the joint part allows the ridges and troughs of each joined segment to meet each other. A water stoppage method for a segment is characterized in that layered waterstopping is performed in a direction crossing the wide long groove. Here, adhesive packings include butyl-based, polybutene-based, polyisobutyl-based, polyvinyl-based,
It is made of rubber asphalt compound material, etc., and the packing itself has elasticity and adhesiveness.

According to the present invention, when each segment is tightened with bolts and nuts, the component force of the adhesive packing is concentrated between the openings of the wide long grooves, that is, at the upper and lower edges of the grooves, so that the packing is simply In addition to being confined within the wide long groove, the packing is divided at the peaks to form a plastic deformation region, and an elastic region is formed at the valleys. By holding it in place, several layers of water-stopping action are achieved.
A preferred embodiment of the present invention will be explained with reference to FIGS. 1 to 4.

Figure 1 is a vertical cross-sectional view showing a tunnel excavated by the shield method and lined with segments, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a diagram showing the segments assembled in a ring shape. The perspective view shown in FIGS. 4A and 4B are longitudinal cross-sectional views of main parts of the main girder portion or the joint portion described for explaining the method for stopping water in segments of the present invention. 1 in Fig. 1 is a shield jack, and this thrust is supported by segments. 2 is the tail of the shield, and 3 is a segment of the primary lining. Further, 4 is concrete with a secondary lining, and 5 is earth. FIG. 2 shows the primary lining by three types of segments 3, A, B and C. Third
6 in the figure has an arc-shaped outer plate, and on the peripheral edge of this outer plate there is a joint part 7 for forming a ring in the circumferential direction of the tunnel, and this ring shape is connected in the water depth direction, which is the axial direction of the tunnel. The segments are constructed by welding together the main girder parts 8 for extension and assembly. Reference numeral 9 indicates a vault hole provided in the joint portion 7 and the main girder portion 8. 10 is a vault inserted into the vault hole, and 11 is a nut. 1
2 is a kraut hole through which pea gravel, mortar, etc. are injected between the segment 3 and the ground 5. Note that 13 is a reinforcing rib between the opposing main girder portions 8.

FIG. 4 shows the water stop method of the present invention in which the joint parts 7 of each segment 3 are connected together, or the main girder parts 8 and 8 are joined together by adhesive packing 1.
4 is interposed between the two. Reference numeral 15 designates a wide long groove with an opening 18 provided along the edge of the outer panel 6 in the longitudinal direction of the joint portion 7 and main girder portion 8 of the segment 3. Reference numeral 16 indicates a flat portion of the joint portion 7 and the main girder portion 8. 17 are 1 to 5 peaks 19 and valleys 20 that are slightly lower than the flat portion provided inside the groove 15.
It is a small protruding edge consisting of. These wide long grooves 15 and small protruding edges 17 can be provided at the upper and lower edges with the vault hole 9 in between when the widths of the joint portion 7 and main girder portion 8 of the segment 3 become large.

Therefore, in the present invention, first, the ground on the face is excavated by a length corresponding to one ring of segment 3, and then one ring of the segment is assembled on the shield part, and then the shield jack 1 is attached to segment 3. Support it and operate it, then propel the shield by one ring. At this time, when assembling only one ring of segment 3,
A wide long groove 1 with a wide opening 18 in the joint part 7 of
An adhesive packing 14 is attached to the bolt 5, and a vault 10 is inserted into the vault hole 9 and tightened with a nut 11. In addition, when extending one ring's worth of segments further in the tunnel axis direction than the assembled one-ring's worth of segments 3, adhesive packing 14 is attached to the wide long groove 15 in the main girder part 8 of each segment 3. The bolt 10 is also inserted into the vault hole 9 and tightened with the nut 11. In this way, each segment 3 is assembled and a cylindrical or rectangular tunnel lining is constructed. In this case, as a water stoppage method for the tunnel lining segment, there is a 1 to
Packing 14 is interposed between the joint portion 7 and the main girder portion 8 of each segment 3 having a small protruding edge 17 consisting of five peaks and valleys (FIG. 4A). In addition, for those in which the width of the joint portion 7 and the main girder portion 8 of the segment is large, an opening 1 having small protruding edges 17 at the upper and lower portions across the vault hole 9 is provided.
It is also possible to combine eight wide long grooves 15 (FIG. 4B).

After assembling the segment 3 in this way and applying the primary lining, pea gravel, mortar, etc. are injected through the grout hole. After this, a secondary lining with concrete 4 may be applied inside the primary lining.

As described above, according to the water stopping method for tunnel lining segments of the present invention, the openings in the wide long grooves in the longitudinal direction of the main girder portion and the joint portion are widened, and small protruding edges are formed in the grooves. Due to the opposing peaks and peaks and valleys and valleys of the opening and small protruding edges of adjacent segments, adhesive packing is concentrated in an elastic state above and below the opening and in each valley, and the fine details between each peak are concentrated. Since the packing forms a plastic deformation area, it is possible to stop water in multiple layers against external water pressure from the circumferential direction of the tunnel.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the conventional shield construction method for tunnel lining, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a perspective view showing a state in which segments are assembled into a ring shape. It is a diagram. FIGS. 4A and 4B are explanatory diagrams of a method for stopping water in tunnel lining segments according to the present invention. 3...Segment, 6...Segment outer plate,
7...Joint part, 8...Main girder part, 9...Vault hole, 10...Vault, 11...Nut, 13
... Reinforcement rib, 14 ... Adhesive packing, 15 ... Wide long groove, 16 ... Flat part, 1
7...Small protruding edge consisting of peaks and valleys.

Claims (1)

[Claims] 1. In a method of joining the main girder part and the joint part of a segment with bolts and nuts, first, adhesive is applied to a wide long groove of a wide opening provided in the flat part of the main girder part and the joint part. Then, by tightening each segment to be joined with bolts and nuts, the packing between the wide long grooves is sealed between the openings of each joined segment, and the longitudinal ends of the wide long grooves are sealed. A small protruding edge consisting of a plurality of parallel peaks and valleys lower than the flat part of the main girder part and the joint part in the direction crosses the wide long groove at the opposing part of the peaks and valleys of each joined segment. A water stoppage method for a tunnel lining segment, characterized in that layered water stoppage is performed in the direction in which water stops.