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Joint reinforcement structure for shield tunnel end and a construction method

A technology for strengthening structures and shield tunnels, which is used in tunnels, tunnel linings, earthwork drilling, etc.

Pending Publication Date: 2019-01-15
HAINAN UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a combined reinforcement structure and construction method for the end of a shield tunnel in order to solve the problem of how to select the reinforcement method when the stratum at the end of the shield tunnel is a water-rich sand layer

Method used

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  • Joint reinforcement structure for shield tunnel end and a construction method
  • Joint reinforcement structure for shield tunnel end and a construction method
  • Joint reinforcement structure for shield tunnel end and a construction method

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Embodiment Construction

[0157] see Figure 1 to Figure 5 Shown:

[0158] The combined reinforcement structure at the end of the shield tunnel provided by the present invention is a rectangular box-type structure as a whole, and the rectangular box-type structure is surrounded by reinforcement structures on four sides, wherein the reinforcement structure near the foundation pit is frozen soil wall 1, and the other three sides The reinforced structure is cement-soil diaphragm wall 2.

[0159] The insertion depth of the vertical freezing pipe 3 in the permafrost wall 1 is 1-2m in the impermeable layer below, the layout length of the vertical freezing pipe 3 is 3m on both sides of the shield tunnel, and the diameter of the vertical freezing pipe 3 is 127mm or 108mm or 169mm; The freezing pipes 3 are arranged in 1-3 rows, arranged in flower arrangement, the spacing of the vertical freezing pipes 3 is 800mm, the vertical freezing pipes 3 close to the working well enclosure structure 4 are 300-400mm away f...

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Abstract

The invention discloses a joint reinforcement structure for a shield tunnel end and a construction method. The joint reinforcement structure is a rectangular box structure as a whole, and the rectangular box structure is formed by reinforcement structures surrounded on four sides. The reinforcement structure near a foundation pit is a frozen soil wall, and the reinforcement structures on the remaining three sides are cement soil continuous walls. The method includes a first step of construction of cement soil continuous walls by using a TRD method to construct continuous walls of cement soil with a three-cycle method; a second step of construction of vertical frozen soil wall by firstly, drilling of freezing holes, installing a freezing station at the same time; after confirming that the freezing meets the door chiseling condition, starting to break a hole wall, forcibly unfreezing before a shield main machine enters into the hole, pulling out a vertical freezing tube after the shieldmain machine completes entering and exiting the hole, and grouting. The joint reinforcement structure has the beneficial effects that strong construction practicability, convenient construction quality control and outstanding reinforcement effect. Compared with a traditional cement-soil mixing piles reinforcing method, the method saves cost and greater promotion and application value is ensured.

Description

technical field [0001] The invention relates to a joint reinforcement structure and a construction method, in particular to a joint reinforcement structure and a construction method at the end of a shield tunnel. Background technique [0002] The end reinforcement of shield tunnel is a key link in the construction of shield tunneling method, which has great construction risks. When the shield enters and exits the tunnel, the underground continuous wall in the tunnel area must be broken first, and all steel bars must be cut off. The time required for demolition of the cave door is very tight and the construction is difficult. After the portal is demolished, the strength and sealing of the reinforced body are very high. If the reinforcement effect is not good, the gap between the shield and the portal and the surface settlement will easily occur during the demolition of the portal, which will endanger the nearby underground pipelines and building security. In order to preve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/06E21D11/10
CPCE21D9/001E21D9/003E21D9/06E21D9/0609E21D11/10
Inventor 刘勇潘玉涛胡俊
Owner HAINAN UNIVERSITY
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