Connecting joint of ring beam of steel core concrete column used for topdown construction method foundation pit engineering

Abstract

The invention belongs to a connecting joint of a ring beam of a steel core concrete column used for topdown construction method foundation pit engineering in the underground structure of a fixed building. An underground structural beam (3) and a steel core concrete column (2) are connected by a reinforced concrete ring beam (1), a column end socket (4) is formed below the underground structural beam (3) and the steel core concrete column (2) in topdown construction method construction, the section size and the reinforcement of the column end socket (4) are the same as those of a permanent framework column after the topdown construction method execution is finished, the column end socket (4) and a contact position of the steel pipes of the steel core concrete column (2) are connected by using end socket connection studs (12), and the end socket connection studs (12) are welded on the outer walls of the steel pipes of the steel core concrete column (2) and arranged alternately along the outer perimeters of the walls of the steel pipes of the steel core concrete column (2). As optimization, a joint of a steel pipe column and the ring beam can also be provided with annular ribs (6) or studs (5). By adopting the joint, the penetration problem of reinforcing steel bars at the position of the joint of the beam column of the steel core concrete column can be completely avoided, and the problem of shear capacity of the concrete ring beam and the steel core concrete column can also be solved.

Description

technical field [0001] The invention belongs to the beam-column node structure of the underground structure of a fixed building, and in particular relates to a foundation pit project using a steel pipe concrete column in the reverse method. Background technique [0002] The reverse method of foundation pit engineering is a construction method that combines the main structure and the supporting structure in an all-round way. Generally, the underground diaphragm wall or other temporary enclosure walls are constructed along the exterior wall of the basement of the building, and at the same time, the permanent walls inside the building are constructed. The position of the frame column shall be constructed with intermediate support piles and columns, as a support for bearing the self-weight and construction load of the superstructure before the bottom plate is sealed during construction; then construct the beam-slab structure of the main structure, as the horizontal support of the...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the connection problem of steel bars at the beam-column node position in the existing upside-down foundation pit engineering using steel tube concrete columns, the present invention provides a new type of beam-column node for the upside-down foundation pit engineering using steel tube concrete columns

Adopting this joint can completely avoid the crossing problem of steel bars at the beam-to-column joints of CFST columns, and at the same time solve the problem of shear bearing capacity of concrete ring beams and CFST columns

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