Prefabricated hollow beam slab construction method

Abstract

The invention discloses a prefabricated hollow beam slab construction method. The method comprises the steps of 1, formwork making; 2, steel bar machining and installing, wherein the tail ends of plain round steel bars should be made into 180-degree semicircular hooks, the bent straight inner diameter of the hooks is not less than 2 .5 d, and the hook ends should have straight segments with a length not less than 3 d; when the tail ends of ribbed steel bars are made into right-angled hooks, the length of straight segments of the hook ends should not be less than 3 d, and the bent diameter of straight hooks should not be less than 5 d; bent-up steel bars should be bent into smooth curves; fixing bars are arranged on the top plate and the web of a hollow beam slab every 0.8-1.5 m, and the fixing bars are fixedly welded to the plain round steel bars or ribbed steel bars or bent-up steel bars intersecting with the fixing bars; 3, prestressed bar making and installing; 4, tensioning; 5, concrete pouring; 6, prestressed bar loosening. In the prefabricated hollow beam slab construction method, the mode of arranging the fixing bars on the top plate and the web of the hollow beam slab is adopted to solve the problem that inflatable core formworks float.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a construction method of a prefabricated hollow beam slab. Background technique [0002] The spans of prefabricated hollow beams and slabs can reach 10, 13, 16, and 20 meters. The main advantages are as follows: the use of high-strength steel bars can save about 20%-40% of the amount of steel bars; prestressed hollow beams and slabs can greatly increase The crack resistance and durability of the beam, the use of high-grade concrete can reduce the size of the section, reduce the weight of the beam, and increase the spanning capacity of the bridge, which is also conducive to construction, transportation and erection; due to the comprehensive compression of the concrete, the concrete can be fully utilized The advantage of good compression resistance improves the stiffness of the beam. However, there are also some problems in the practical applicati...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a prefabricated hollow beam slab construction method by overcoming the above-mentioned defects in the prior art that the mandrel floats up during transportation, the steel bars in contact with the mandrel are easily deformed, and the internal geometric dimensions of the hollow beam slab cannot be guaranteed. , this construction method solves the floating problem of the inflatable mandrel and ensures the internal geometric dimensions of the prefabricated hollow beam slab

Images