Reinforcing construction method for foam core die precast hollow plate beam

Abstract

The invention discloses a reinforcing construction method for a foam core die precast hollow plate beam. The reinforcing construction method comprises a first step of first fixing a steel strand on a precast pedestal and performing initial tensioning, and binding a base plate rebar layer and a web plate rebar layer together; a second step of installing a foam core die and a top plate rebar layer; a third step of integrally tensioning the steel strand; a fourth step of erecting a steel outer die; a fifth step of arranging a fastening system on the outer side of the steel outer die, and enabling a support back rib of the fastening system to be tightly pressed on the steel outer die; a sixth step of arranging a pressure lever assembly at the position of a top opening of the steel outer die after steel outer die adjustment is finished; a seventh step of pouring concrete; and an eighth step of performing concrete curing to an age, dismantling the fastening system and the steel outer die, releasing the steel strand, and making the foam core die precast hollow plate beam. According to the reinforcing construction method for the foam core die precast hollow plate beam, the core die can be effectively prevented from floating upwards, design thicknesses of a hollow plate beam top plate and a web plate are guaranteed, and one-time pouring forming can be achieved.

Description

technical field [0001] The invention relates to a manufacturing and construction method of concrete prefabricated components for civil engineering, in particular to a manufacturing process of prefabricated hollow plate girders with foam mandrels. Background technique [0002] With the development of highway construction projects, the structural design of simply supported beams has become mature, and its construction technology is relatively simple, which is convenient for large-scale and centralized production, and has been widely used in highway bridges in our country. However, in recent years, in many engineering quality inspections, it has been found that some engineering hollow slab simply supported beams have longitudinal fine cracks after a short period of operation, which affects the durability of the engineering. After analysis, the main reason is that the thickness of the roof and web is insufficient. Therefore, in the construction of hollow slab beams, controlling...

AI Technical Summary

Problems solved by technology

In China, traditional air capsules are commonly used as inner tube molds in the prefabrication of highway and bridge hollow slabs. Although they can be used repeatedly, the price is relatively high. The prefabrication of a single hollow slab requires two sets of air capsule inner tube molds, which need to be constructed after demoulding. End-capped concrete has many processes; the inflation degree, floating control and demoulding time of the air capsule inner tire mold are not easy to control, and it is easy to cause engineering defects due to insufficient thickness of the roof and web of the hollow slab

[0003] Patent ZLCN201120241280.7 discloses a hollow slab girder with a foam mandrel. The manufacturing method of the hollow slab girder disclosed in the patent document specification still cannot effectively prevent the mandrel from floating up and overcome the problem of insufficient thickness of the roof and web. Moreover, concrete pouring and maintenance need to be carried out several times, which cannot be completed at one time.

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