CN1191418C - In-situ deposited prestressed hollow reinforced concrete roof and its construction process - Google Patents

Abstract

The present invention relates to a cast-in-situ prestressed hollow reinforced concrete roof and a construction method thereof, which is characterized in that the cast-in-situ reinforced concrete of the roof contains a core-pulling and pore forming cavity and prestressed reinforcements. The construction method comprises the following steps: a mould is erected, and a mould plate is paved; the concrete reinforcements are paved; the prestressed reinforcements are placed; a core mould is pre-buried and is fixedly positioned in order to overcome the core mould floating and the construction displacement in the concrete; the concrete is cast and vibrated, the concrete is maintained, and the core mould is extracted after the concrete is concreted and hardened to proper strength to form a cavity; the prestressed reinforcements are stretched and anchored; the mould plate is removed. The present invention has the advantages of high bearing capability, small self weight, small deflection deformation, good shock resistance and easy construction.

Description

In-situ deposited prestressed hollow reinforced concrete roof and job practices thereof

(1) technical field

The invention belongs to a kind of steel bar reinforced hollow concrete roof cast-in-situs and job practices thereof, be specially adapted to the cast-in-situ floor of many, highrise building and longspan structure.

(2) background technology

At present, steel bar reinforced hollow concrete roof cast-in-situs mostly adopts general reinforced concrete structure, and its supporting capacity, deadweight, anti-seismic performance, difficulty of construction more and more can not satisfy the requirement of highrise building and longspan structure development.As publication number is the application for a patent for invention that CN85106092A, name are called cassette ceiling cast-in-site concrete method, it discloses a kind of method of cassette ceiling cast-in-site concrete, the in-situ deposited porous reinforced concrete superstructure of being poured into a mould, the core-drawing pore-creating cavity is contained in its inside, equally also there is above-mentioned deficiency in this superstructure, therefore, develop a kind of novel reinforced concrete hollow floorslab and job practices thereof for being badly in need of.

(3) summary of the invention

Purpose of the present invention just provides that a kind of supporting capacity is big, deadweight is little, deflection deformation is little, anti-seismic performance good and the in-situ deposited prestressed hollow reinforced concrete roof of easy construction and job practices thereof.

In-situ deposited prestressed hollow reinforced concrete roof of the present invention, the cavity of core-drawing pore-creating is contained in its inside, it is characterized in that the cast-in-situ reinforced concrete inside of making contains prestressed reinforcement; Described prestressed reinforcement can be arranged on the inner or bright beam inside of superstructure; Described cavity is the cavity that forms behind the core in the Cast-in-place concrete setting and harden is extracted out to suitable intensity.Described prestressed reinforcement is bonded prestress reinforcing bar or no-cohesive prestressed reinforcement.

The job practices of in-situ deposited prestressed hollow reinforced concrete roof of the present invention is:

(1) formwork is laid template;

(2) lay the concrete reinforcing bar;

(3) lay prestressed reinforcement;

(4) pre-buried core with the core stationary positioned, overcomes the unsteady and construction displacement of concrete core mould;

(5) cast vibrate concrete, maintenance, extract core at the concrete setting and harden out to suitable intensity and form cavity;

(6) prestressed reinforcement stretch-draw anchor;

(7) stripping.

The present invention has been owing to adopted prestressed reinforcement and non-core-drawing pore-creating structure, have supporting capacity big, from heavy and light, advantages such as amount of deflection is little, anti-seismic performance good, easy construction, be specially adapted to the hollow building cover of many, highrise building and longspan structure.

(4) description of drawings

Fig. 1 is the perspective view of the embodiment of the invention.

Fig. 2 represents the schematic diagram of the embodiment one of prestressed reinforcement wiring form for the present invention.

Fig. 3 represents the schematic diagram of the embodiment two of prestressed reinforcement wiring form for the present invention.

(5) specific embodiment

The invention will be further described below in conjunction with description of drawings:

As shown in Figure 1, the present invention is made up of prestressed reinforcement 1, steel bar concrete 2, cavity 3.Among the embodiment that Fig. 1 provides, described prestressed reinforcement 1 places reinforced concrete hollow floorslab inside.Described prestressed reinforcement 1 also can be arranged on Ming Liangzhong, forms bright beam hollow building cover.Described cavity 3 is extracted the cavity that forms behind the interior core out for the Cast-in-place concrete setting and harden to suitable intensity.Described prestressed reinforcement 1 can be bonded prestress reinforcing bar or no-cohesive prestressed reinforcement.

The job practices of in-situ deposited prestressed hollow reinforced concrete roof of the present invention is as follows: (1) formwork, lay template; (2) lay the concrete reinforcing bar; (3) lay prestressed reinforcement; (4) pre-buried core with the core stationary positioned, overcomes the unsteady and construction displacement of concrete core mould; (5) cast vibrate concrete, maintenance, extract core at the concrete setting and harden out to suitable intensity and form cavity; (6) prestressed reinforcement stretch-draw anchor; (7) stripping.

Claims (5)

1, a kind of in-situ deposited prestressed hollow reinforced concrete roof, the cavity of core-drawing pore-creating is contained in its inside, it is characterized in that the cast-in-situ reinforced concrete inside of making contains prestressed reinforcement.

2, in-situ deposited prestressed hollow reinforced concrete roof according to claim 1 is characterized in that prestressed reinforcement is arranged on the inner or bright beam inside of superstructure.

3, in-situ deposited prestressed hollow reinforced concrete roof according to claim 1 is characterized in that described cavity is the cavity that forms behind the core in the Cast-in-place concrete setting and harden is extracted out to suitable intensity.

4, in-situ deposited prestressed hollow reinforced concrete roof according to claim 1 is characterized in that prestressed reinforcement is bonded prestress reinforcing bar or no-cohesive prestressed reinforcement.

5, a kind of job practices of in-situ deposited prestressed hollow reinforced concrete roof is characterized in that:

(1) formwork is laid template;

(2) lay the concrete reinforcing bar;

(3) lay prestressed reinforcement;

(4) pre-buried core with the core stationary positioned, overcomes the unsteady and construction displacement of concrete core mould;

(5) cast vibrate concrete, maintenance, extract core at the concrete setting and harden out to suitable intensity and form cavity;

(6) prestressed reinforcement stretch-draw anchor;

(7) stripping.

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