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A Construction Method for Shield Tunneling Under the Existing Station in Powder Soil Stratum

A technology with existing stations and construction methods, applied to earth drilling, underground chambers, shaft equipment, etc., can solve problems such as easy formation of cavities, large soil disturbance, easy over-excavation, etc., to reduce construction risks and difficulties, Reduce the effect of land subsidence and control attitude

Active Publication Date: 2021-01-26
中建八局轨道交通建设有限公司
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Problems solved by technology

[0004] In addition, when the shield tunnel is under construction, the excavation of the portal, underground excavation and pile grinding will generate noise and vibration, which will have a great impact on the daily operation and passengers of the existing station; Large soil disturbance, easy over-excavation, easy to form cavities, groundwater influx

Method used

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  • A Construction Method for Shield Tunneling Under the Existing Station in Powder Soil Stratum
  • A Construction Method for Shield Tunneling Under the Existing Station in Powder Soil Stratum
  • A Construction Method for Shield Tunneling Under the Existing Station in Powder Soil Stratum

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Please see attached figure 1 , a construction method for shield tunneling under an existing station in a silt layer, comprising the following steps:

[0033] Step 1: Manually demolish the portal 1 of the existing station 2, which is an underground continuous wall with a thickness of 600 mm. When opening door 1, noise reduction facilities such as quilts can be installed around the underground diaphragm wall to reduce the impact of noise on the operation of existing lines.

[0034] Step 2: Reinforce between the existing station 3 and the current station 2.

[0035] Please see attached figure 2 , Step 2.1: Reinforce the originating end of the existing station 3 with the high-pressure jet grouting pile 4 . Preferably, the pile diameter of the high-pressure rotary grouting pile 4 is 600@450mm, the reinforcement length of the starting end...

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Abstract

The invention discloses a construction method for shield tunneling under an existing station in a silt layer, which comprises the following steps: step 1: removing the portal (1) of the existing station (2); step 2: removing the existing station ( 3) and the existing station (2) for reinforcement; step 3: the shield machine passes through the reinforcement area of ​​the starting end of the existing station (3); step 4: the shield machine passes under the floor of the existing station (3) range, and carry out synchronous grouting and secondary grouting during the underpass; step 5: the shield machine passes through the existing station (3) and exits the end area of ​​the existing station; step 6: the shield machine exits the existing station (3) ) and grind the retaining piles of the existing station (3). The invention can reduce the impact of disturbance on the silt layer soil during the tunneling process of the shield machine, effectively control the attitude of the shield machine, reduce the impact of ground subsidence, reduce construction risks, and speed up the construction period.

Description

technical field [0001] The invention relates to a rail transit station construction technology, in particular to a construction method for shield tunneling under an existing station in a silt layer. Background technique [0002] In recent years, my country's urban rail transit has developed rapidly. In the process of urban tunnel construction, shield machines are usually used for tunnel excavation. Due to the influence of urban environment and subway lines under construction in the planning of shield tunnels, new construction The existing subway lines will inevitably intersect with the operating tunnels for construction, which will easily cause damage to the operating tunnels, and major safety accidents such as collapse and subsidence will occur. In the prior art, there is no construction method for the construction of this kind of underpass operation tunnel, and the accumulation of experience in construction methods is mainly concentrated in the construction process of ordin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/06E21D9/093E21D11/10E21D9/08
CPCE21D9/06E21D9/0607E21D9/08E21D11/105E21D9/093
Inventor 汪澄江浩葛优良汪滢
Owner 中建八局轨道交通建设有限公司
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