A real-time supplementary grouting anti-settlement control method for shield tunneling construction

Abstract

The invention discloses an anti-subsidence control method by supplying grouting in real time in shield construction. According to the anti-subsidence control method, a shield machine cutter, a shield shell, a shield tail brush, around soil layers, segments, a first annular segment, a second annular segment, a third annular segment, a water glass grout grouting pipe, an auxiliary synchronous grouting pipe, a main synchronous grouting pipe, a water glass grout grouting pump, a water glass grout preparation barrel, a shield machine cement grout synchronous grouting box and a ball valve are included. Synchronous grouting and secondary grout supplying are effectively integrated, cement injection and water glass injection are organically combined, therefore the timeliness and the effectiveness of filling of gap in the backs of the segments are strengthened, disturbances caused by intersection construction of a traditional secondary grouting and normal tunneling of the shield machine are eliminated, compared with the traditional secondary grouting method, cement grout does not need to be prepared separately, the grouting amount is greatly decreased by separately pumping the water glass grout, the construction schedule is speeded up, the automation level is improved by taking full use of self equipment of the shield machine, and the manpower and material resources are saved.

Description

technical field [0001] The invention relates to a control method during shield tunnel construction, in particular to a real-time supplementary grouting anti-settlement control method for shield tunnel construction, and belongs to the technical field of civil engineering construction technology application. Background technique [0002] Although the shield construction technology has been greatly developed, the ground subsidence caused by the construction is still unavoidable. When shield construction is carried out in the city, it is inevitable to pass through the section with complex ground conditions and dense superstructures, which has a great impact on ground subsidence. The control requirements are very high. When the shield tunnel passes through a major risk project or area that requires strict ground settlement control, one method is to adopt a scheme of soil reinforcement, and then the shield tunnel crosses again. This scheme requires sufficient reinforcement space on...

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Problems solved by technology

Therefore, after the excavation of the shield tunnel, there is an excavation gap between the stratum and the segment. Due to the weight of the shield itself, the excavation gap is usually larger at the upper part. Therefore, if the excavation gap at the top of the shield is not in the excavation process When filling in a timely manner, when passing through highly sensitive strata such as silt and silt fine sand, and the tunnel structure is close to important risk source projects, the induced surface deformation can easily exceed the control standard and is difficult to control

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