Lap joint bar type prestressed two-way laminated plate and construction method

Abstract

The invention provides a lap joint bar type prestressed two-way laminated plate which comprises at least three prefabricated prestressed thin plates, a rear pouring concrete layer and a plate seam lap joint steel bar. The prefabricated prestressed thin plates are large-width plates with ribs and steel bar trusses, and the plate seam lap joint steel bar is S-shaped in continuous mode, stretches cross plate seams, is horizontally paved on the upper surfaces of the adjacent prefabricated thin plates, and is embedded in the rear pouring concrete layer. The prefabricated prestressed thin plates are small in thickness, light in self weight, high in two-way reinforcement strength, not prone to crack and large in transportation radius and facilitates amplification of service radius of products.

Description

technical field [0001] The invention relates to a building structure floor slab, in particular to a reinforced concrete prestressed two-way laminated floor slab. Background technique [0002] There are two types of traditional large-span laminated slabs: non-prestressed and prestressed. The prefabricated slabs in non-prestressed laminated slabs use thicker flat plates or flat plates with steel trusses. The amount of steel used is large, the thickness is large, and it is easy to crack. It can only be designed as a one-way board, and the cost performance is poor. Traditional prestressed laminated slabs usually use thicker slabs. Not only is the anti-arching difficult to control, but also the transverse reinforcement laid on the prefabricated slab perpendicular to the direction of the precast slab is difficult to bear the bending moment in this direction due to the small effective height of the force. Therefore also can only calculate by unidirectional force, a kind of prestre...

AI Technical Summary

Problems solved by technology

[0002] There are two types of traditional large-span laminated slabs: non-prestressed and prestressed. The prefabricated slabs in non-prestressed laminated slabs use thicker flat plates or flat plates with steel trusses. The amount of steel used is large, the thickness is large, and it is easy to crack. It can only be designed as a one-way board, and the cost performance is poor

Traditional prestressed laminated slabs usually use thicker slabs. Not only is the anti-arching difficult to control, but also the transverse reinforcement laid on the prefabricated slab perpendicular to the direction of the precast slab is difficult to bear the bending moment in this direction due to the small effective height of the force. Therefore, it can only be calculated according to one-way stress. CN200420068045.4 discloses a prestressed prefabricated slab with ribs. Holes are opened on the ribs for piercing steel bars, and the thickness of the slab is reduced at the same time. It can be designed as a two-way slab

However, prefabricated slabs are cumbersome to manufacture, labor costs are high, and reinforcement and pipeline embedding are difficult. The ribs are tall and heavy, and the prefabricated slabs have few transverse reinforcements, and the slabs are easy to crack along the longitudinal direction. The slab width is generally small, which reduces the cost of slab fabrication and installation ergonomics

In addition, during the construction of this kind of high-rib prefabricated slab with holes, there is usually no temporary support in the middle of the slab. Although it is convenient for construction, the reinforcement of the slab is usually controlled by the construction stage, resulting in waste of slab reinforcement, and the deflection and prestress of the slab during the construction stage are released. Larger, so that the thickness of the laminated slab cannot be effectively reduced, and the advantages of the prestressed slab cannot be fully utilized

A kind of labor-saving, time-saving and low-cost prestressed two-way laminated slab that does not need to embed full-length transverse bottom bars in post-cast concrete but can bear forces in two directions has not been reported yet.

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