Treatment method for the connection between the retaining cast-in-situ pile and the basement structure floor in the reverse foundation pit

Abstract

The invention relates to a connection processing method for an enclosure bored concrete pile and a cellar structure floor slab in a reversed foundation pit. The connection processing method comprises the following specific steps: constructing the enclosure bored concrete pile, excavating to a position with elevation of about 2m below the corresponding floor slab, and manufacturing an enclosure waist beam; arranging an inner ring beam at a position 1 / 3 of a first span of a structural exterior wall, and connecting the inner ring beam with the enclosure waist ring by adopting a support replacement plate belt and H400 section steel; after mounting is completed and the floor slab structure reaches strength, excavating an inferior soil body, and constructing a lower-layer structure; and after a bottom plate is completed, dismounting the support replacement plate belt, welding a water-stop ring sheet on support replacement section steel, and upwards casting the structural exterior wall, and a structural main beam between the inner ring beam and the exterior wall, thereby completing structural construction. The connection processing method can avoid water leakage caused by poor water-stop effect of a concrete contact surface at the exterior wall when a concrete beam structure is directly adopted as a force transmission structure between the waist ring and the inner ring beam, so that a great number of holes which penetrate through the section steel when all section steel is adopted as the force transmission structure are reduced, and the water-stop reliability of the exterior wall is greatly strengthened.

Description

technical field [0001] The invention relates to a connection processing method for a surrounding cast-in-place pile and a basement structure floor (except the roof) in an upside-down foundation pit. Background technique [0002] At present, in areas with relatively complex environments, the upside-down method is often used for foundation pit construction. In the upside-down method, the enclosure structure generally uses an underground diaphragm wall, which also serves as the outer wall of the basement structure. The waterproofing of this enclosure mainly depends on the self-waterproofing of the ground wall. The seams are then treated separately. For small foundation pits or foundation pits with many obstacles, the ground wall is not suitable, so cast-in-place piles are used as the enclosure form, but the cast-in-place piles cannot be used as the outer wall of the basement structure. The stress situation of each floor is more complex. Although the concrete structure is relia...

AI Technical Summary

Problems solved by technology

For small foundation pits or foundation pits with many obstacles, the ground wall is not suitable, so cast-in-place piles are used as the enclosure form, but the cast-in-place piles cannot be used as the outer wall of the basement structure. The stress situation of each floor is more complex. Although the concrete structure is reliable as the force transmission system, the contact surface between the concrete structure and the external wall is not good and it is easy to leak, and all the steel structures are used as the force transmission system, which leads to a large number of steel structures. Too many, too many holes in the outer wall make the construction difficult and the implementation effect is not ideal

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