Prefabrication combined box type underground diaphragm wall and construction method thereof

Abstract

The invention discloses a prefabrication combined box type underground diaphragm wall comprising prefabrication box type underground diaphragm wall components as foundation pit retaining structures. Each prefabrication box type underground diaphragm wall component comprises a box provided with a hollow part, and a web arranged in the box, wherein the vertical two ends of the box are provided withfirst tenons or first mortises, and the transverse two ends of the box are provided with second tenons or second mortises. Adjacent prefabrication box type underground diaphragm wall components are connected through mortise-tenon structures to form a combined box type underground diaphragm wall body. The invention further discloses a construction method of the prefabrication combined box type underground diaphragm wall. For the prefabrication combined box type underground diaphragm wall and the construction method thereof, the box type underground diaphragm wall components made through factory-like concentrated prefabrication are adopted for plane and vertical combined assembly of a foundation pit, any foundation pit plane forms can be formed, flexibility is achieved, prefabrication quality is high, constriction quality is stable, stress participation can be conducted in time, a large amount of labor force is saved, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of underground diaphragm wall structures, and in particular relates to a prefabricated combined box-type underground diaphragm wall and a construction method thereof. Background technique [0002] The construction process of the underground diaphragm wall is to use a special groove forming machine to excavate under the condition of mud retaining wall to form a groove of a certain length, then put the steel cage processed on the ground into the groove section, and sink it to a certain depth After fixing, the conduit is used for underwater concrete pouring to complete a unit wall section, and then the subsequent wall sections are constructed sequentially. The wall sections are connected to each other by specific joints to form a continuous reinforced concrete wall, which can be used as a water cutoff , anti-seepage, load-bearing, water-retaining structure. [0003] The construction process of the existing und...

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Problems solved by technology

[0004] (1) Manual tying and welding of reinforcement cages is difficult to control and standardize the production quality, the construction site is large, and the cost of civilized construction is high; (2) The collapse of the groove wall will make it difficult to sink and place the reinforcement cages in the underground diaphragm wall, making it difficult to place and floating , affecting safety; (3) Underwater concrete pouring has local arching and boundary invasion due to collapse holes, increasing the risk of manual processing; (4) The joints of the underground diaphragm wall are made of I-beams or pipes, and the concrete pouring is not dense, resulting in joints Water leakage and sand leakage and other subsidence risks; (5) The concrete pouring of the underground diaphragm wall should not be compacted or layered and segregated, which will affect risks such as waterproofing and soil retaining; (6) The underground diaphragm wall can only be used as a temporary support structure and cannot be used as the main permanent structure , the lining wall is required, which is a waste of land and uneconomical; (7) prefabricated assembly cannot be carried out, and the pre-embedding of the relevant floors and the positioning of the connector are not accurate, and the error is large; (8) the maintenance period of the underground diaphragm wall is long after pouring, and cannot Immediate force; (9) underground diaphragm wall joints need to make large-scale I-beams, which is time-consuming and waste materials, and the cost is high; (10) it is convenient to construct the "one" shape, but "T", "L" or "Z" (11) Non-environmental protection and energy-saving construction methods encouraged and supported by national industrial policies

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