Shallow buried pipe curtain supporting system and construction method thereof

Abstract

The invention provides a shallow buried pipe curtain supporting system and a construction method thereof. The shallow buried pipe curtain supporting system comprises a plurality of first steel pipes,second steel pipes and connecting mechanisms arranged on the steel pipes at intervals, wherein the connecting mechanisms comprise an upper flange plate, a lower flange plate, a large rib plate and a small rib plate; lock catches matched with each other are fixedly arranged on the upper flange plate; the first steel pipes and the second steel pipes arranged at intervals are in an n shape, and the system reinforcement is completed by filling micro-expansion cement slurry and self-compacting concrete. By adopting the supporting system and the construction method provided by the invention, the ground surface settlement can be effectively reduced, the safety and reliability of the upper structure can be ensured, the utilization rate of underground space is high, the structural stress is more reasonable, the construction method and procedure are simple, and the economical performance is higher.

Description

technical field [0001] The invention relates to the field of tunnel and underground engineering construction, in particular to a shallow-buried pipe curtain support system and a construction method thereof. Background technique [0002] With the continuous acceleration of urbanization in our country and the continuous concentration of urban population, the construction of subways and underground expressways has become one of the main ways for major cities to relieve traffic pressure. In the shallow-buried large-section tunnel project passing through existing buildings, structures and urban roads, the use of the pipe curtain construction method can well reduce the surface settlement and ensure the safety and reliability of the upper structure, which has obvious advantages. [0003] However, the current pipe curtain support system has the following problems: (1) the pipe curtain structure completes the connection between the pipes by cutting the steel pipes, which destroys the...

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Problems solved by technology

[0003] However, the current pipe curtain support system has the following problems: (1) the pipe curtain structure completes the connection between the pipes by cutting the steel pipes, which destroys the integrity of the steel pipes, resulting in a decrease in the stiffness and bearing capacity of the steel pipes; (2) due to the steel pipes and concrete The difference in elastic modulus is large, and the outer wall of the steel pipe and the concrete between the pipes are peeled off under the load, and the structural stiffness and bearing capacity are weakened; (3) The concrete between the pipes forms oblique cracks along the outer walls of the two connected steel pipes under the load, resulting in The compressive performance of the upper concrete is poor, the tensile performance of the middle and lower tensile connecting members between the pipes is poor, and the resource utilization rate is low; (4) There are many processing steps on the construction site, and the construction methods and procedures are complicated, resulting in slow construction progress; (5) The connection between the pipes is not tight, and there is water seepage; (6) During the jacking process of the traditional pipe curtain, the friction force of the soil layer on the steel pipe is relatively large, and the jacking is difficult; (7) The traditional pipe curtain discharges soil between the pipes The process causes the upper soil to fall off, resulting in surface subsidence

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