Double-fluid synchronous grouting block and construction method thereof

Abstract

The invention discloses a double-fluid synchronous grouting block and a construction method thereof. A passage I and a passage II are formed in the grouting block; a flow rate increase device is arranged at an outlet of the passage I; and a back seepage prevention device is arranged at an outlet of the passage II. The construction method comprises the following modes: a double-fluid grouting modein which flow rates of A fluid and B fluid are respectively increased by the flow rate increase device and the back seepage prevention device and a pressure difference is formed in the passages so asto implement rapid mixing of the A fluid and the B fluid; and a single-fluid grouting mode in which the A fluid sucked from an A fluid tank enters the passage I to carry out single-fluid grouting. Thedouble-fluid synchronous grouting block and the construction method thereof, which are disclosed by the invention, have the advantages that a double-fluid mixing region is positioned outside a shieldshell so as to prevent blockage of a grouting pipe; both A and B fluid pipelines can be cleaned by high-pressure water, and the A fluid pipe also can be dredged by adopting a steel chisel; the volumeis low, the grouting amount is low and equipment cost and construction cost are low; an existing single-fluid synchronous grouting and double-fluid secondary replenishing shield machine can be transformed; and a new machine also can adopt the grouting scheme.

Description

Technical field [0001] The invention relates to tunnel construction, in particular to a two-liquid synchronous grouting block and a construction method thereof. Background technique [0002] Shield machine is often used in subway tunnel excavation. One of the most important construction standards is the control of settlement and the quality of segment assembly. In the prior art construction methods, how to fill and consolidate the gap between the segment and the excavated soil in time is a key point in the development of the shield machine. [0003] The most effective measure to fill the gap behind the segment is to use synchronous grouting, which can be further subdivided into two-fluid synchronous grouting and single-fluid synchronous grouting. The main points of the synchronous slurry design include preventing insufficient filling and floating of the tube due to the loss of slurry, and so on. Compared with the latter, the two-fluid simultaneous grouting has a short initial set...

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Problems solved by technology

[0005] The invention proposes a double-liquid synchronous grouting block and its construction method, which can transform the existing single-liquid synchronous grouting + double-liquid secondary grouting shield machine into a double-liquid synchronous grouting shield machine, which solves the problem There is a problem that most shield machines cannot meet the double liquid synchronous grouting

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