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
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[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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