Method for controlling quality of tunnel pipe sheet built by using shield method and pipe sheet structure

Abstract

The invention provides a method for controlling the quality of a tunnel pipe sheet built by using a shield method, which comprises the steps of pipe sheet structure design, pipe sheet construction detection, pipe sheet assembling quality requirement and tunnel stability control, wherein in the pipe sheet structure design, the water prevention and the bonding strength are improved by the structural design of a connecting way, strength, water prevention, and the like of pipe sheets; in the pipe sheet construction detection, the eight-point measurement is carried out on the pipe sheets in the process of construction, the concentricity relation between the previous ring of pipe sheets and a shield shell is calculated, and the position of the next ring of pipe sheets is selected; in the pipe sheet assembling quality requirement, an assembled ring height difference and a longitudinal joint flare angle are controlled to confirm the assembling quality; and in the tunnel stability control, the floating of the pipe sheets is effectively prevented in a frame weight and synchronous slurry injection matching construction way after assembly. Accordingly, the quality of the pipe sheets is controlled in the whole course from structural design to construction, thereby ensuring the tunnel construction quality.

Description

technical field [0001] The invention mainly relates to a method for controlling the quality of tunnel lining in shield tunnel construction, especially a method for improving the quality of tunnel lining by means of waterproof design, strength design, and pressure after collage of segments. Background technique [0002] The segments are assembled into a ring in the shield tail as the shield machine advances, which is the main structure of the tunnel. Each ring segment consists of several standard blocks, 2 adjacent blocks, and 1 capping block. [0003] At present, according to the construction of different shield machines, there are two mainstream assembling forms of segments, one is that the capping block is assembled at the top, and the other is that the capping block can be assembled at any position. [0004] Segment type: [0005] (1) Taking the capping block assembled at the top as an example, the segments generally consist of left-curved rings, straight-line rings and...

AI Technical Summary

Problems solved by technology

Especially under the premise that the joints are required for segment assembly, it is very difficult to correct the axis deviation in construction. When necessary, the segments must be fitted with the design axis by pasting cork strips, which brings great inconvenience to the construction, and Construction quality is difficult to guarantee

[0013] In terms of tunnel quality control, the control of some quality indicators such as the super-large diameter tunnel ellipticity, the tunnel axis, and the buoyancy of the tunnel in China is not completely satisfactory, especially the control of the tunnel buoyancy.

[0014] Furthermore, each segment is connected to its front, rear, left, and right adjacent segments by bolts. The current connection structure is that each segment is provided with several grooves recessed by the inner arc surface. , the grooves of two adjacent segments are communicated with through holes, so that the bolt penetrates the through hole from the groove of one segment, and then penetrates into the groove of the other segment, and connects with a bolt located in the groove. The nut is screwed, the operator clamps the bolt head with a wrench, and then tightens the nut with another wrench. In this way, the operation is inconvenient and time-consuming, and the degree to which the bolt can be tightened manually is also limited.

In addition, due to the large gap between the bolt and the hole, it is easy to cause alignment deviation

[0015] In addition, the problem of water seepage and strength of the tunnel is another problem that needs to be solved urgently: for the current waterproof structure of the segments, please refer to Figure 9 As shown, the four end faces around the segments 60a, 60b are provided with a connected groove 61, and a water stop 70 is embedded in the groove 61, and the water stop 70 protrudes from the surface of the segments 60a, 60b. In addition, a water-swellable rubber 71 is embedded in the middle of the surface of the waterstop 70, but the water-swellable rubber 71 is very easy to fall off due to collision during construction, and the purpose of waterproofing cannot be achieved.

[0016] Furthermore, if Figure 10 As shown, when constructing and assembling segment 60, it is necessary to push and press the end face of segment 60 by a jack, so that segment 60 is positioned side by side with other segments that have been collaged. The ejection of the top, and the side end face collides with other segments and is damaged.

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