CN101012750B - Combined connection method between lining segment and inner lining in shield tunneling - Google Patents

Abstract

The present invention relates to tunnels, in particular to a combined connection method for lining segments and inner linings in shield tunnels. The tenon and groove are provided with anchor bars, so that the two can be effectively connected into one body. The joint surface can transmit pressure, shear force and bending moment, and the combined force of the superimposed components can reduce the thickness of the structure. The advantage is that it can Increase the tensile and shear resistance of the joint surface between the outer lining and the inner lining, prevent the inner and outer linings from being disengaged, and ensure that the inner and outer linings work as an integral composite component, which can reduce the thickness of the structure and have considerable economic benefits .

Description

Combined connection method between lining segment and inner lining in shield tunneling

technical field

The invention relates to tunnels, in particular to a combined connection method for lining segments and inner linings in shield tunnels.

Background technique

Shield method tunnels have been widely used in large-depth underground projects. With the application of shield method in urban large-scale sewer pipelines and pressure water tunnels, the stress conditions of lining structures are becoming more and more complicated. Pressure, but also to withstand the internal water pressure. The single-layer prefabricated lining can no longer meet the structural force requirements, and the cast-in-place secondary integral lining must be used together as the load-bearing structure. In the shield tunneling project under internal pressure, in order to meet the technological requirements, correct construction errors and the needs of structural stress, it is generally necessary to adopt a double-layer lining structure. The joint surface of the outer lining and the inner lining usually adopts the following structural measures: before the construction of the inner lining, the bolt hand holes, grouting holes, lifting holes and other grooves on the inner surface of the outer lining segment are filled with cement and smoothed, and then a layer of waterproof membrane is laid , only the pressure is transmitted between the inner and outer layers without shear force and bending moment; the lining concrete and even steel bars extend into the grooves such as the hand holes of the outer segment, and these parts can locally transmit pressure, shear force and bending moment; before pouring the lining Smooth out the larger grooves on the inner surface of the outer segment, and chisel or leave the rest of the parts untreated. In the above case, only pressure and partial shear force can be transmitted between the inner and outer layers, so lining segments and inner linings with relatively large thickness are required, and the volume of components with large thickness is large. With the increase of tunnel length, Will directly lead to a significant increase in engineering costs. In general engineering, due to the limitation of engineering conditions, it is usually desirable to take a smaller segment and lining thickness.

Contents of the invention

The object of the present invention is to provide a combined connection method between the lining segment and the inner lining in a shield tunnel according to the shortcomings of the above-mentioned prior art. Tenon grooves are set on the joint surface of the joint, and anchor bars are set between them to effectively connect the two into one body. The joint surface can transmit pressure, shear force and bending moment, and the joint force is shared by the laminated components to reduce its structural thickness.

The object of the present invention is realized by the following technical solutions:

A combined connection method for lining segments and inner linings in shield tunnels, characterized in that the method adopts the following steps: firstly, the lining segments are prefabricated, and at this time, the inner arc of the lining segment steel mold should be Concave-convex grooves are set on the surface, so that the inner arc surface of the poured outer lining segment has a concave-convex tenon-groove structure, and the anchor bar is pre-buried on the side of the inner arc surface in the reinforcement cage of the lining segment; after that Carry out the assembly of the lining segments; after the assembly of the outer lining segments is completed, dig out the pre-embedded anchor bars and cold-bend them to the design position; finally carry out the integral pouring construction of the inner layer lining, and insert the chiseled end of the anchor bars in the inner lining.

The concavo-convex tongue-and-groove structures are distributed continuously, sequentially and evenly along the inner arc surface of the lining segment.

The arrangement of the anchor bars is evenly distributed along the inner arc surface of the lining segment.

The horizontal and vertical intervals of the anchor bars shall not be greater than 500mm.

The invention has the advantages of increasing the tensile and shear resistance of the joint surface between the outer lining and the inner lining, preventing the inner and outer linings from disengaging, and ensuring the inner and outer linings to work as an integral composite component. It can reduce the thickness of the structure, and has considerable economic benefits.

Description of drawings

Accompanying drawing 1 is the schematic diagram of direct contact connection structure in the prior art;

Accompanying drawing 2 is a schematic diagram of the connection structure of the waterproof layer in the prior art;

Accompanying drawing 3 is the schematic diagram of connection structure of the present invention;

Specific technical solutions

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1-3, the labels 1-8 respectively represent: outer lining segment 1, waterproof material layer 2, inner lining 3, tenon and groove structure 4, groove 5, tenon 6, anchor bar 7, anchor bar 7 8 at one end.

Embodiment: This embodiment relates to a combined connection method between the lining segment and the inner lining in a shield tunnel. The steps used in this method are: firstly, the lining segment 1 is prefabricated. Concave-convex grooves are set on the inner arc surface of the segment steel mold, so that the inner arc surface of the poured outer lining segment 1 has a concave-convex tenon-groove structure 4, and the inner arc surface is placed in the reinforcement cage of the lining segment 1 On one side, the cold-bendable anchor bars 7 are pre-buried; after that, the lining segment 1 is assembled; after the outer lining is assembled, one end 8 of the pre-embedded anchor bars 7 is chiseled out, cold-bent to the designed position, and finally In the integral pouring construction of the inner lining 3 , the chiseled end 8 of the anchor bar 7 is embedded in the inner lining 3 . The inner lining 2 is connected and fixed to the inner arc surface of the lining segment 1 through integral casting, and the joint surface between the lining segment 1 and the inner lining 3 is concavo-convex and alternately engaged with each other.

The tenon and groove structures 4 are distributed continuously, sequentially and evenly along the inner arc surface of the lining segment 1 . The concavo-convex tenon-groove structure 4 is continuously formed by the groove 5 and the tenon 6 in sequence, and the tenon 6 and the groove 5 penetrate the inner arc surface of the segment 1 .

The setting of the anchor bars 7 is evenly distributed along the inner arc surface of the lining segment 1 .

The scope of the horizontal and vertical intervals of the anchor bars 7 is the range of the transverse and longitudinal intervals of the anchor bars 4 should be determined according to calculations, and generally should not be greater than 500mm. The embedding depth of the anchor bar 4 in the outer lining segment 1 and the inner lining 3 should not be less than 10 times the diameter of the anchor bar 4 .

The protrusion height of the tenon 6 or the recessed depth of the groove 5 is not less than 6mm. The shear and tensile effect of the tenon groove and the anchor bar is through the aggregate occlusal effect of the joint surface and the anchor bar passing through the joint surface on the joint surface. It is guaranteed by the tension formed on the joint surface after sliding. Its size and spacing should be consistent with the aggregate particle size, mainly to form a natural rough surface. Its value can refer to the requirements of composite components.

Claims (3)

1. assembled connecting method that is used between shield tunnel lining segment and inner lining, it is characterized in that this method adopts following step: at first be prefabricated lining segment, should be provided with the tongue-and-groove of concave-convex surface this moment on lining segment punching block intrados, the intrados of the outer lining segment that feasible cast is come out has concavo-convex tenon groove structure, inner cambered surface one side is buried dowel in advance underground in the reinforcing cage of lining segment; Carry out the assembly unit of lining segment afterwards; After treating that afterwards outer lining segment assembly unit is finished, dig out pre-buried dowel, clod wash is to design attitude; That carries out inner lining at last wholely waters construction, and the end that dowel is dug out is embedded in the inner lining, and being provided with along the intrados of lining segment of described dowel evenly distributes.

2. a kind of assembled connecting method that is used between shield tunnel lining segment and inner lining according to claim 1, it is characterized in that described concave-convex surface tenon groove structure distribution along the intrados of lining segment continuously, successively, evenly distribute.

3. a kind of assembled connecting method that is used between shield tunnel lining segment and inner lining according to claim 1 is characterized in that the horizontal and vertical interval of described dowel must not be greater than 500mm.

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