Pre-tensioning method hollow board core extraction type square steel inner mold construction method

Abstract

The invention relates to a core extraction type square steel inner mold construction method during the construction of a pre-tensioning method hollow board. The method is mainly invented by solving the problems that in the prior art, a hollow board core mold constructed by using a pre-tensioning method uses a polystyrene board core mold, and can easily float up; a combined steel core mold easily deforms, and the like. Used materials comprise a square steel pipe, a steel bar support frame, a plastic thin film, a steel belt and positioning molds, wherein square steel inner molds are spliced; a plurality of positioning molds are taken and are arranged in the front side and the back side; the square steel pipe is laid on the positioning mold; the steel bar support frame is arranged on the square steel pipe; the steel pipe is arranged in a way of attaching to the steel bar support frame; after the splicing of the square steel pipe and the steel bar support frame is completed, a plastic thin film is used for tightly covering the outside of the steel pipe. A packaging machine and the steel belt are used for tightly clamping the steel square inner molds; after the hollow board bottom board concrete casting is completed, the square steel inner molds are conveyed to an installation position; the top board steel bars are bound; the web board and top board concrete is cast; after the concrete intensity reaches the square steel inner mold dismounting requirement, the steel bar support frame and the square steel pipe are extracted out. The method has the advantage that the upward floating and the deformation cannot easily occur.

Description

Technical field: [0001] The invention relates to a construction method of a core-pulling square steel inner mold during construction of a pretensioned hollow slab. Background technique: [0002] For the hollow slab mandrel constructed by the pretensioning method, the traditional construction technology mainly adopts the benzene slab mandrel or combined steel mandrel. During the construction process, it is easy to have floating phenomenon, resulting in insufficient thickness of the finished roof of the hollow slab. The combined steel mandrel is assembled from pieces of steel formwork, which is prone to formwork deformation, seams, wrong tables, and errors in geometric dimensions, resulting in poor internal appearance of the finished hollow slab. Dismantling, wasting time, and demoulding is difficult. Invention content: [0003] The technical problem to be solved by the present invention is to provide a pre-tensioned hollow slab core-pulling square steel inner mold constru...

AI Technical Summary

Problems solved by technology

[0002] For the hollow slab mandrel constructed by the pretensioning method, the traditional construction technology mainly adopts the benzene slab mandrel or combined steel mandrel. During the construction process, it is easy to have floating phenomenon, resulting in insufficient thickness of the finished hollow slab roof

The combined steel mandrel is assembled from pieces of steel formwork, which is prone to formwork deformation, seams, wrong tables, and errors in geometric dimensions, resulting in poor internal appearance of the finished hollow slab. Demolition, waste of time, difficult to remove formwork

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