JPH02136497A - Flexible segment - Google Patents

Abstract

PURPOSE:To improve workability by projecting fitting materials from the ring plates of a pair of interposed frame segments, clamping the ring plates by bolts and nuts through cut-off rubbers and filling clearances with a water expansion cut-off material. CONSTITUTION:A pair of frame segments 1, 2 are interposed between a normal segment S, and two ring-shaped fitting materials 9, 10 are projected axially from one or both of the ring plates 5, 6 of these frame segments 1, 2. Cut-off rubbers 11, 11A are compressed and held between ring plates 5, 6, and the ring plates 5, 6 are clamped mutually by a bolt 12 and nuts 14 through the cut-off rubbers 11, 11A. An axial clearance H between the skin plates 3, 4 of the respective frame segments 1, 2 is clogged by a skin plate 8, and the clearance H surrounded by the skin plates 3, 4, the fitting materials 9, 10 and the cut-off rubbers 11, 11A is filled with a water expansion cut-off material 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flexible segment that is used together with ordinary segments for lining shield tunnels.

[Conventional technology]

Normal segments used for lining shield tunnels are generally made into a ring-shaped lining body by fastening these segment pieces with bolts, and then this lining body is made into a ring-shaped lining body.
They are continuously connected in the axial direction of the tunnel to form the tunnel lining.

On the other hand, uneven settlement and earthquake resistance of shield tunnels.

Analysis of behavior in the axial direction of tunnels during construction of extremely steep curves has been studied, and in the case where the behavior in the axial direction of the tunnel is larger than the deformation of the shield tunnel, flexible segments have been developed to deal with this. It is now being put into practical use.

[Problem to be solved by the invention]

However, such conventional flexible segments have problems such as a complicated assembly structure and poor workability in terms of curved construction and meandering correction.

In addition, since segment rings are assembled with adjacent rings in a staggered pattern, weak points in the joint in the circumferential direction can be covered by the body of the adjacent ring, but conventional flexible segments have long reinforcing frames on their end faces. It was.

This invention was made by focusing on such conventional problems, and has a simple structure, good workability, and
The purpose is to provide a flexible segment suitable for constructing a mechanically strong and safe shield tunnel by absorbing secondary stress generated in the shield pipe such as angular displacement, expansion/contraction, and twisting.

[Means to solve the problem]

The flexible segment according to the present invention has a pair of frame segments interposed between nine ordinary segments, and two ring-shaped fitting members are axially attached to one or both of the ring plates of each frame segment. Water stop rubber is compressed between each of the ring plates by protruding and partially fitted between these fitting materials, and the ring plates are connected to each other with bolts and nuts via this water stop rubber. and closing the axial gap between the skin plates of each frame segment with an outer cover plate, the outer cover plate,
The gap surrounded by the skin plate, the fitting material, and the water stop rubber is filled with a water-swellable water stop material.

[Effect]

The water stop rubber in this invention is interposed between each ring plate of a pair of frame segments in a compressed state, and the water stop rubber in the compressed state is inserted between each ring plate of a pair of frame segments, and the water stop rubber in the axial direction of the ordinary segment connected to these frame segments is caused to move around these frame segments. Even if twisting or angular displacement occurs, the shield tunnel absorbs these relative secondary displacements, deforms as a whole to follow the ground displacement, prevents damage or breakage, and prevents water expansion. Together with the water stop material, it works to reliably prevent water from leaking from the outside into the secondary lining concrete.

Further, the two ring-shaped fitting members stably hold the position of the water stop rubber, and come into contact with the inner and outer circumferential surfaces of the water stop rubber, thereby acting to further improve the watertight effect.

〔Example〕

FIG. 1 is a sectional view of the main parts of an embodiment of the flexible segment according to the present invention. In FIG. 1, 1.2 is a pair of frame segments constituting the flexible segment S, and these are It is attached by bolts and nuts between regular segments on the left and right with these as the center. In addition, the right and left ends of each frame segment 1 and 2 are opposite to each other, so that the skin plates 3 and 4 of each frame segment 1 and 2 and the end surfaces of ring plays 1, 5 and 6 have a certain level. They face each other with a distance between them. here.

The ring plate 6 is provided so as to be flush with the end surface of the skin plate 4, and the ring plate 5 is provided so as to be set back somewhat from the end surface of the skin plate 3, with a predetermined width between each frame segment 1 and 2. A gap 11JH is formed. 7 is an inner plate that is integrally attached to the inner circumference of the ring plate 5.

This maintains the mounting strength of the ring plate 5. Reference numeral 8 denotes an outer covering plate for closing the gap between the skin plates 3 and 4, and this is fixed only to the outer periphery of the skin plate 3 by welding or the like. In other words, this jacket plate 8 only contacts the skin plate 4. Reference numerals 9 and 10 designate two ring fitting members that protrude in the axial direction from the outer surface of the ring plate 6;
A part of a ring-shaped waterproof rubber 11 is fitted between the holes 10. That is, the water-stop rubber 11 is made of a ring-shaped rubber material having a T-shaped cross section and consisting of a collar portion 11a and a protrusion portion 11b. The protruding portion 11b is fitted between the fitting members 9 and 10, and the end surface of the collar portion 11a is on the outer surface of the ring plate 5, and the inner and outer circumferential surfaces are on the inner circumferential surface of the skin plates 1 and 3 and the inner circumferential surface of the inner plate 7. The frame segments 1 and 2 are interposed between the frame segments 1 and 2 so as to be in contact with the inner peripheral surfaces thereof. 12 is the ring plate 5. A bolt 12 is provided to pass through the water stop rubber 11 and the ring plate 6, and a nut 14 is screwed into the tip of the bolt 12 via a rubber washer 13 made of chloroprene or the like. Note that when the assembly is completed, the water stop rubber 5 is attached to the bolt 12. It is compressed by the nut 14 with a certain amount of force. In addition, in the final process of the next lining, the skin plate 3,
4゜fitting material 9. A part of the water-stopping rubber 11 and the gap covered by the jacket plate 6 are filled with a water-expandable waterstop material 15 as a joint joint. 16 is frame segment 1,
The secondary lining concrete 17 provided on the inside of frame segment 2 is a joint material packed into the gap between each secondary lining concrete 16 on the frame segments 1 and 2 side.

The flexible segments are A type and B type.

The ring plates 5, 6 are formed into a predetermined size according to each type of K type and assembled in a predetermined order, and the water stop rubber 11 with an initial thickness of 60 mm is compressed to 30 mm using a shield jack, for example. Bolt for joint 12. After adjusting the amount of tightening of the nut 14, the jacking thrust is released. Further, when a predetermined number of normal segments are connected and stabilized, the bolt 12. The nut 14 is loosened so that the water stop rubber 11 can be freely deformed.

After the -method lining is completed in this way, the water-expandable water stop material 15 is packed into the joint joint, which is the gap H, and then the secondary lining concrete 16 is applied.

Such flexible segments S are used by being interposed between multiple regular segments, and the ground may deform if the shield tunnel sinks unevenly or is subjected to earthquake motion. The deformation follows the movement of the ground, and the deformation of the shield tunnel can be greatly improved, and the shield tunnel as a whole will not undergo major deformation.

In particular, in this invention, the ring-shaped water-stop rubber 11, which is the basis for obtaining the above-described modified shield tunnel, has its protrusion 11b located between the fitting members 9 and 10, and is easily bent and deformed. Vertical direction (
In addition to always being in a consolidated state in the radial direction), the collar portion 11a is also in a consolidated state in the horizontal direction (axial direction) with respect to the ring plate 5, so there is no twisting or angular displacement between the frame segments 3 and 4 due to the deformation of the ground. Even if axial displacement occurs, the watertightness provided by the water stop rubber 11 is ensured. In addition, the water-expandable waterproof material deforms in accordance with the fluctuations between the frame segments 3 and 4, and faces the gap between the skin plates 3 and 4 to prevent sliding between the outer cover plate 8 and the skin plates 1-4. It expands due to water leaking through the contact gap, ensuring sufficient water-tightness in the gap. In this way, the water-stop rubber 11 and the water-expandable water-stop material 15 prevent water from leaking inward from the secondary lining concrete 16, and together with the behavior of the frame segments 1.2 due to ground movement, deformation of the shield tunnel. Prevent damage to this while keeping it at a small metamorphosis.

FIG. 2 shows another embodiment of the invention. This has basically the same configuration as the one shown in Fig. 1, but here, the water stop rubber IIA is not provided with a collar, and two lip lies are formed on the side that contacts the ring plate 5. The ring plate 5 is provided with an adjustment screw 18 for adjusting the gap between the ring plates 5 and 6. According to this, the water-stopping effect of the water-stopping rubber IIA is due to its inner and outer peripheral surfaces and the fitting material 9.
10, but also by axial compaction of the lip 11C against the ring plate 5. Further, the adjusting screw 18 functions as a member that temporarily transmits the jacking thrust, and arbitrarily sets the amount of compression of the water stop rubber 11A or the amount of gap between the water stop rubber 11A and the ring plate 5 after the jack thrust is released. used as such. Thus, this embodiment also provides the same flexibility and watertightness as the above embodiment.

〔Effect of the invention〕

As described above, according to the present invention, a pair of frame segments are interposed between ordinary segments, and two ring-shaped fitting members are provided axially protruding from one of the ring plates of each of these frame segments. Then, a water-stop rubber is compressed and interposed between each of the above-mentioned ring plates by fitting a portion between these fitting materials, and each of the above-mentioned ring plates is fastened with bolts and nuts via this water-stop rubber. In addition, the axial gap between the skin plates of each of the above-mentioned frame cements is closed by an outer cover plate, and a water-expandable water stop material is installed in the gap surrounded by the outer cover plate, the skin plate, the fitting material, and the water stop rubber. Because I filled it up.

Even when a large number of connected normal segments undergo relative axial displacement, twisting, or angular displacement, these relative secondary displacements are effectively absorbed, and the shield tunnel as a whole follows ground displacement while preventing damage. This has the effect of preventing water damage from occurring and effectively preventing water leakage from the outside into the inside of the secondary lining concrete.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a flexible segment according to the present invention, and FIG. 2 is a sectional view of another embodiment of the flexible segment. S... Flexible segment, 1, 2... Frame segment, 3
, 4... skin plate, 5, 6... ring plate,
8... Outer cover plate, 9.10... Fitting material, 11. ll
a...Water stop rubber, 12...Bolt, 14...Nut, 1
5. Water-expandable water stop material. Patent Appearance Daisan Bussan Co., Ltd.

Claims (1)

[Claims] A pair of frame segments interposed between adjacent regular segments, and two ring-shaped fitting members protruding in the axial direction from one or both of the ring plates on opposite sides of each of these frame segments. , a water stop rubber that is partially fitted between these fitting materials and is compressed and interposed between the ring plates on the opposite sides, and the ring plates on the opposite sides are connected to each other via this water stop rubber. Bolts and nuts to be fastened, an outer cover plate that closes the axial gap between the skin plates of each frame segment, this outer cover plate,
A flexible segment comprising the above-mentioned skin plate, a fitting material, and a water-swellable water-stopping material filling a gap surrounded by the water-stopping rubber.