Construction method for integrated unilateral formwork of circular lining wall based on inverse method

Abstract

The invention discloses a construction method for an integrated unilateral formwork of a circular lining wall based on an inverse method. Relays are installed on a steel bar framework of an underground diaphragm wall, after the bottom earthwork of a template is flattened, a concrete cushion layer is leveled and arranged, pull rods are arranged in the lining wall, one end of each pull rod is connected with the corresponding relay, the other end of each pull rod penetrates through the template in a sealing manner and is fixedly connected with a horizontal reinforcement pipe and a vertical reinforcement pipe on the outer side of the template, the horizontal reinforcement pipes on the outer sides of adjacent template sections abut together to form a complete circle of the unilateral formwork,a discharge port is arranged at the top of the template, the upper part of the discharge port is higher than a bottom opening of an upper lining wall, the distance between the discharge port and the wall surface of the upper lining wall can ensure pouring and vibration construction, the excess concrete at the discharge port is chiseled and repaired before initial setting of lining wall concrete. According to the method, the whole circle is poured and formed at a time without vertical construction joints, compactness is guaranteed, no support is required to be erected on the outer side of the template, and Rachel steel bars between the template and the underground diaphragm wall are reduced.

Description

technical field [0001] The invention belongs to the field of municipal construction, and in particular relates to a construction method for integral single-side formwork support of an annular lining wall based on an upside-down method. Background technique [0002] At present, the design and construction of deep foundation pits such as municipal water supply and drainage pump houses often adopt the method of combining two walls, that is, the underground continuous wall doubles as the outer wall, and the circular foundation pit lining wall used for horizontal support serves as the inner wall, and the inner wall It is a reinforced concrete structure, and the reverse method is usually used for construction—according to the design conditions of foundation pit excavation, excavation is carried out step by step from top to bottom. The lining wall is completed by top-down and segmented construction, that is, reverse construction. [0003] The ring-shaped lining wall based on the u...

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Problems solved by technology

[0003] The ring-shaped lining wall based on the upside-down method usually has a height of 3-4m for each section of the lining wall. There are two methods of unilateral formwork commonly used in formwork. One uses a diagonal bracing system. One end of the diagonal brace is fixed on the diagonal brace fixing rod, and the other end is fixed on the opposite tension screw. However, it is necessary to build a bracket, which increases the material and The labor cost delays the construction progress; the other adopts a supportless system, and a large number of horizontal planting bars or jacking members are arranged between the outer underground diaphragm wall and the inner wall formwork to increase the tie force on the formwork and achieve the purpose of stabilizing the formwork. purpose, but requires a lot of bar planting and welding costs, which reduces the construction progress

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