Beam-slab framework early removal construction method

Abstract

The invention provides a beam-slab framework early removal construction method. The method comprises the following steps: (1) span changing treatment is performed, wherein a technical measure of adding a single row of upright poles under a secondary joist of 10*10cm square lumber at the bottom of a longitudinal mid-span part of a slab for supporting is adopted, the square lumber secondary joist separates the slab with the span more than 4m into a bidirectional plate structure with the early removal span between 2 and 4m in a beam support mode; and in the same way, the technical measure that double poles are vertically added at the bottom of the beam every other 2.6 to 4m for a supporting is adopted, and the beam is turned into a framework removal structure with the early removal span between 2.6 and 4m; (2) the structure strength, rigidity and crack width in framework early removal are determined and calculated according an existing formula, and when the calculation results meet requirements at the same time, early removal construction is permitted; and (3) framework early removal construction is performed, wherein after the lowest permitted framework removal strength is determined, the actual early removal strength of concrete is calculated on the basis of the pressure testing strength of a test block is maintained under the same condition; whether the actual early removal strength is more than the calculated early removal strength or not is judged, and if the actual early removal strength is more than the calculated early removal strength, a later removal support system can be maintained, and other framework supports are removed.

Description

1. Technical field [0001] The invention relates to a construction method in the construction field, in particular to a construction method for early demolition of beam-slab formwork. 2. Background technology [0002] The Beijing local standard "Technical Regulations for Formwork Early Demolition Construction" No. DB11 / 694-2009, will come into effect on July 1, 2010. This technology uses an early demolition device to directly support the bottom formwork of the roof, so that the span of the formwork removal structure becomes less than 2M. When the concrete strength reaches 10MPa or more, the formwork can be demolished early; its existing problems and deficiencies: ① Only solve the problem below 2m The problem of early demolition of the span floor is narrow in scope of application; ②The variable-span early demolition device needs to be processed by a professional manufacturer, which is inconvenient for construction; The state is not as good as that of Banzhulou. [0003] "Res...

AI Technical Summary

Problems solved by technology

This technology uses an early demolition device to directly support the bottom formwork of the top plate, so that the span of the formwork demolition structure becomes less than 2M. When the concrete strength reaches 10MPa or more, the early demolition of the formwork can be implemented; its existing problems and deficiencies: ① only solve the problem below 2m The problem of early demolition of the span floor is narrow in scope of application; ②The variable-span early demolition device needs to be processed by professional manufacturers, which is inconvenient for construction; The state is not as good as the board to help the floor

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