A construction method of cast-in-place concrete stairs

Abstract

The invention discloses a construction method for cast-in-situ concrete stairs, which comprises the following steps: 1) laying the floor, the ladder beam and the staircase formwork, and laying steel bars; 2) pouring concrete for the floor, the stairs, the ladder beam at the upper end of the floor and the floor The height from the starting ladder beam to the concrete is 8‑12cm; 3) Remove the side formwork on the side of the starting ladder beam on this floor near the stairs, remove the laitance on the surface of the formed concrete and chisel; 4) Install the starting ladder beam on this floor near the side of the stairs 5) Lay the upper floor, ladder beams and stair formwork, and lay steel bars; 6) Concrete continues to pour. The ladder beam of the invention is poured in upper and lower layers, and the construction joints formed between the two pours are horizontal construction joints, which can greatly improve the structural integrity and facilitate the cleaning of residues.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a construction method of cast-in-place concrete stairs. Background technique [0002] In multi-storey building structures, most of the stairs are cast-in-place slab structures, and the construction of the stairs must be carried out simultaneously with the construction of the main structure. In this way, it is inevitable to leave construction joints. Usually, the construction joints are set at about 1 / 3 of each staircase with the smallest shear force and are left perpendicular to the bottom formwork. The traditional construction method is easy to leave root residues in the construction joints, and the concrete strength is not up to the standard requirements, and the formwork is removed. There are the following shortcomings: 1) The joint line is not straight, and the root garbage of the construction joints cannot be eradicated. Structural mechanical perfo...

AI Technical Summary

Problems solved by technology

The traditional construction method is easy to leave root residues in the construction joints, and the concrete strength is not up to the standard requirements, and the formwork is removed. There are the following shortcomings: 1) The joint line is not straight, and the root garbage of the construction joints cannot be eradicated. Structural mechanical performance; 2) The steel bars at the construction joints of the stairs are not reserved in full length, and the structure has poor shear resistance and overall poorness, resulting in poor seismic performance of the stairs; 3) Pre-reserved steel bars at the joints of the stairs are likely to cause corrosion of the steel bars and are inconvenient for construction; 4) The workload of chiseling concrete and cleaning up garbage at the joints is heavy, which affects work efficiency; 5) The joints of old and new concrete in the construction joints are easy to form staggered positions, and the post-processing work is heavy

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