Construction method for reinforcing silty clay tunnel through jet grouting piles on middle step

A construction method and technology of rotary grouting piles, which are applied in tunnels, earthwork drilling, tunnel lining, etc., can solve problems such as subsidence and subsidence, tunnel excavation deformation, etc., achieve reliable excavation construction, improve accuracy, and avoid pitting The effect of face collapse

Active Publication Date: 2021-09-07
CHINA RAILWAY 20 BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If effective reinforcement measures are not taken, the tunnel excavation will often be deformed, subsidence and collapse

Method used

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  • Construction method for reinforcing silty clay tunnel through jet grouting piles on middle step
  • Construction method for reinforcing silty clay tunnel through jet grouting piles on middle step
  • Construction method for reinforcing silty clay tunnel through jet grouting piles on middle step

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Embodiment Construction

[0057] Such as Figure 1 to Figure 4 Shown is a construction method for reinforcing silty clay tunnels with rotary grouting piles in the middle step. The silty clay tunnel constructed is excavated along the longitudinal extension direction of the tunnel, and during the excavation process, rotary grouting piles are used in the middle steps The method for reinforcing the lower steps and base of a silty clay tunnel includes the following steps:

[0058] Step 1. Upper step excavation and upper primary support:

[0059] Excavate the upper steps of the constructed silty clay tunnel, and simultaneously perform upper primary support 2-1 on the upper cave body 1-1 formed by the excavation of the upper steps during the excavation process of the upper steps;

[0060] Step 2. Temporary inverted arch waist beam structure construction of middle steps:

[0061] Step 201, Excavate the middle step of the constructed silty clay tunnel, during the excavation process of the middle step, synchro...

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Abstract

The invention discloses a construction method for reinforcing a silty clay tunnel through jet grouting piles on a middle step. The method comprises the following steps that firstly, an upper step is excavated, and upper portion primary supporting is carried out; secondly, middle step temporary inverted arch waist beam type structure construction is carried out; thirdly, jet grouting pile center points are arranged on the middle step face, and PVC pipe mounting is carried out; and fourthly, construction of jet grouting pile reinforcement is carried out. The construction method is reasonable in design, easy and convenient to construct and good in using effect, a temporary inverted arch waist beam on the middle step face is constructed, the temporary inverted arch waist beam and an excavated primary support at the upper portion are closed to form a ring, then jet grouting pile construction is conducted on the middle step face, safe and reliable excavation construction of a lower hole body is guaranteed, a tunnel can safely penetrate through a silty clay stratum, and the tunnel structure stability is ensured.

Description

technical field [0001] The invention belongs to the technical field of excavation and reinforcement of silty clay tunnels, and in particular relates to a construction method for reinforcing silty clay tunnels with middle-step rotary grouting piles. Background technique [0002] Silty clay is cohesive soil with a plasticity index between 10 and 17 according to the GB50007-2011 specification, and the bearing capacity of silty clay is low. If effective reinforcement measures are not taken, the tunnel excavation will often be deformed and subside. [0003] The principle of rotary grouting pile technology is to drill holes equipped with grouting nozzles to a specified depth through drilling rigs, and use high pressure to make the cement slurry impact the cut soil, and form cylindrical piles with the rotation and lifting of the grouting nozzles. At present, there are many methods of strengthening silty clay tunnel foundations by using rotary grouting piles, but it is generally ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18
CPCE21D11/105E21D11/18Y02E10/20
Inventor 郭朋超梁永峰吴红兵王洪坤朱红桃李校珂
Owner CHINA RAILWAY 20 BUREAU GRP
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