Foot valves for flexible liquid bladders for end space sealing of underground diaphragm walls

Abstract

The invention relates to a bottom valve of a flexible liquid-state capsule for underground diaphragm end space filling. The bottom valve comprises a valve body and a connection pipe, wherein the connection pipe is fixed at the capsule bottom of the flexible liquid-state capsule; a first boss is arranged at the first end, located in the capsule body, of the connection pipe; the valve body comprisesa valve body end cover and multiple groups of tension springs, outriggers, expansion springs and hooks, which are arranged below the valve body end cover; a second boss buckled with the first boss isarranged on the side surface of the valve body end cover along the circumferential direction; the upper ends of the outriggers are connected with the valve body end cover; included angles are formedbetween the outriggers and the lower surface of the valve body end cover; the first ends of the tension springs are connected with the valve body end cover; the connection points of the tension springs and the valve body end cover are located outside the connection points of the outriggers and the valve body end cover; the second ends of the tension springs are connected with the middle parts of the outriggers; and the outriggers are connected with the hooks through the expansion springs. When the second boss of the valve body end cover is buckled with the first boss, the bottom valve is located in a closed state; and when the lower ends of the outriggers are buckled with the first boss, the bottom valve is located in an open state, and at the moment, the hooks hook the first boss so as toempty the water in the capsule body.

Description

Technical field [0001] The invention belongs to the technical field of underground continuous wall construction, and in particular relates to a bottom valve of a flexible liquid bag used for sealing the end space of the underground continuous wall. Background technique [0002] At present, countries all over the world are seizing the opportunity to vigorously promote the development and construction of underground space; in recent years, my country's modern urban rail transit has developed rapidly, and underground garages and shopping malls are also being vigorously constructed. At present, the underground space envelope structure adopts the underground continuous wall, and the construction of the underground continuous wall joint is complicated. The commonly used construction methods include dumping mud pack + packaging box and using mud encapsulation. [0003] The construction method of dumping mud bag + packaging box has the following shortcomings: (1) If the wall brushing at th...

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Problems solved by technology

[0003] The construction method of throwing mud bag + packing box has the following disadvantages: (1) If the wall at the joint is not in place, the second-stage reinforcement cage cannot be guaranteed to be lowered smoothly, and the horizontal steel bars of the reinforcement cage are difficult to insert into the first-stage I-beam connection groove. Leakage is easy to occur at seams, and the demand for mud bags is large, occupying a large area of ​​the construction site, which cannot meet the standardized construction requirements; Head box and lock pipe, under the action of the lateral pressure of concrete, the joints of the head box and lock pipe are prone to bending, so it is necessary to continuously lift the head box and lock pipe while pouring concrete to prevent sealing The head box and lock pipe are locked by the bypass flow concrete. If the slot hole cannot be pulled out, the subsequent treatment will cause huge economic losses and delay the construction period. Moreover, the transportation cost of the head box and lock pipe is high.

The inlet and outlet slurry valves are fixed to the mud bag through universal joints, the connection method is not stable enough, and the sealing performance is poor; moreover, the inlet and outlet slurry valves are opened by gravity, and closed by using the bottom of the tank against the inlet and outlet slurry valves, and the opening and closing methods are random. If the opening or closing fails, it will cause the sealing failure and delay the construction period

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