A kind of method of tbm construction segment back closed loop

Abstract

The invention belongs to the field of TBM application, and discloses a construction method for a TBM construction segment back closed ring, comprises the steps that in a segment splicing process, a closed ring is arranged every 30-50 meters, and double liquids are poured into one of the closed rings from bottom to top through a working hole to form the closed ring, wherein a grouting material adopts a double-liquid slurry of cement and water glass for the closed ring. According to the method for forming the closed ring through double-liquid grouting, the initial setting time of the cement-water glass slurry is short and control is easy, the early strength is higher than that of common pure cement slurry, the influence of pore water pressure rising in a soil body caused by grouting on the stability of a slope can be reduced when the slope is reinforced, and the effect of reinforcing the slope can be achieved within a short time; and secondly, in a cement-water glass slurry condensationprocess, water loss is low, the stone setting rate is high, and additional settlement cannot be generated on an existing building.

Description

technical field [0001] The invention belongs to the field of TBM application, and in particular relates to a method for closing a ring at the back of a TBM construction segment Background technique [0002] The back grouting of the segment lining is carried out after the bean gravel blowing is completed, and the back grouting of the segment lining is a very important process in the segment lining. [0003] In summary, the problems in the prior art are: [0004] The initial setting time of the cement-water glass slurry in the prior art is not easy to control, and the cement-water glass slurry loses a lot of water during the coagulation process, and the rate of stone formation is high, which will cause additional settlement to the building. [0005] In the prior art, the position detection of the moisture content and the grouting material level in the closed loop is inaccurate, resulting in poor operability in the later stage. Contents of the invention [0006] Aiming at t...

AI Technical Summary

Problems solved by technology

[0004] The initial setting time of the cement-water glass slurry in the prior art is not easy to control, and the cement-water glass slurry loses a lot of water during the coagulation process, and the stone rate is high, which will cause additional settlement to the building

[0005] In the prior art, the position detection of moisture content and grouting material level in the closed loop is inaccurate, resulting in poor operability in the later stage

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