Support system for foundation pit bottom plate replacement in muddy soil layer during deep foundation pit support construction

Abstract

The invention discloses a support replacement system for base plates of a foundation pit of a mucky soil layer in deep foundation pit support construction. The support replacement system comprises a support replacement slab band and a force transfer device, wherein the support replacement slab band is arranged between a foundation pit support structure and a brick mould, and the force transfer device is arranged in a late poured band; the support replacement slab band comprises a constructional anti-crack reinforcement bottom bar, I-steel and a constructional anti-crack reinforcement surface bar; the I-steel is located between the outer side of the brick mould and a fender post; the force transfer device comprises first I-steel and second I-steel; the outer end of the first I-steel and the outer end of the second I-steel are respectively buried in base plates of two sides; the first I-steel and the second I-steel are connected through bolts. According to the support replacement system disclosed by the invention, by combining with the stiffness characteristic of the foundation pit support structure, the I-steel is adopted by the support replacement slab band to perform targeted local reinforcement at the position of the fender post; a support replacement slab band of which the stiffness is high and low by matching with the foundation pit support structure; by arranging the force transfer in the late poured band, the base plates can be effectively connected into a whole to form a horizontal support structure for the base plates.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a supporting system for replacing the base plate of a muddy soil layer foundation pit in deep foundation pit support construction. Background technique [0002] At present, in the process of deep foundation pit support construction, steel or concrete support piles and enclosures are usually used as the enclosure structure, and steel or concrete horizontal supports are set at the enclosure position in the foundation pit to form an overall support system. When changing bracing, set up a bracing belt between the basement floor or floor and the foundation pit enclosure structure, and replace the horizontal support in the pit together with the basement floor or floor structure. Usually, the braces are uniformly reinforced, but the stiffness and shear bearing capacity of the surrounding piles in the foundation pit support enclosure structure are much larger th...

AI Technical Summary

Problems solved by technology

Usually, the braces are uniformly reinforced, but the stiffness and shear bearing capacity of the surrounding piles in the foundation pit support enclosure structure are much larger than the water-stop enclosures arranged between the enclosures, which easily leads to the replacement of the braces. Due to the excessive load transfer to the water-stop enclosure structure, the water-stop enclosure structure is damaged, which threatens the safety of the foundation pit

Moreover, most bottom plates are equipped with post-casting belts, and the current support replacement scheme cannot normally carry out the support of the foundation floor under the working condition of the bottom plate with post-casting belts due to its limited ability to resist horizontal loads

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