Isolation type double-lining shield tunnel construction structure and construction method

Abstract

The invention discloses an isolation type double-lining shield tunnel construction structure and a construction method. The construction structure comprises a primary lining, an isolation buffer layer and a secondary lining, the bottoms of the two sides of the isolation buffer layer are each provided with water collecting pipes, and a plurality of water drainage pipes are arranged between the water collecting pipes and an opening piece box culvert; the construction method comprises the steps that 1, the primary lining and the opening piece box culvert are constructed; 2, a water collecting pipe and a water draining pipe are mounted; 3, an inverted arch filling layer is constructed; 4, the isolation buffer layer is constructed; 5, the secondary lining below a tunnel waist line is constructed; and 6, secondary linings between a middle partition wall, an air duct plate and the tunnel waist line and the air duct plate are constructed. According to the isolation type double-lining shield tunnel construction structure and the construction method, damage to a secondary lining structure caused by water leakage of the primary lining can be effectively reduced, the construction efficiency is improved, the air duct plate and the middle partition wall are constructed synchronously through a special formwork trolley, synchronous construction of residual structures can be achieved under the condition that material transportation is not affected. The isolation type double-lining shield tunnel construction structure and the construction method has the advantages of quick assembly, quick positioning, quick form removal and short process circulation time.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a construction structure and a construction method of an isolated double-lined shield tunnel. Background technique [0002] In recent years, the number of large-scale shield tunneling projects in my country is large, the construction scale is large, the construction technology is difficult and complex, and the development speed is fast. Especially under the trend of large section, deep burial, and high water pressure of subways, highway tunnels, and high-speed railway tunnels, my country has begun to try to use "segment + secondary lining" in the process of building large-scale underwater shield tunnels. The composite lining type of the shield tunnel segment is molded with concrete secondary lining inside the shield segment to form a composite lining structure with the segment lining, which can effectively improve the durability of the tunnel st...

AI Technical Summary

Problems solved by technology

[0004] (1) There is water leakage in the primary lining, and the water stays between the inner arc and the segment for a long time, which is easy to generate water pressure and affect the structure of the secondary lining;

[0005] (2) The segments of the shield tunnel are connected by bolts, and the overall stress state tends to be flexible; while the inner circular arc lining is cast-in-place, the allowable deformation is relatively small, and the overall stress state is rigid; The inner circular arc lining of the composite structure may affect the deformation of the segment to a certain extent, especially in sudden earthquake conditions such as earthquakes;

[0006] (3) Simultaneous construction with shield tunneling has a great influence on the construction progress of shield tunneling;

[0007] (4) In the traditional construction process, the π-type formwork trolley is first used to make the air channel slab, and then the middle partition wall is constructed after the tunnel is penetrated. The main reason is that the span of the air channel slab is too large. According to the requirements of relevant specifications, the concrete formwork removal strength requires 100 %, resulting in high construction cost and long overall construction period

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