CN1275667A

CN1275667A - Light type rib floor and construction method

Info

Publication number: CN1275667A
Application number: CN 00106615
Authority: CN
Inventors: 张云富
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-02
Filing date: 2000-04-02
Publication date: 2000-12-06

Abstract

A ribbed reinforced concrete floor is made up by combining grid of reinforcement and cast-in-situ concrete, and is characterized by that in the ribbed slab bearing positive bending moment, the top chord of steel grid and concrete are combined into flat slab structure to produce resistance to compression and the bottom chord of the grid produces resistance to tension, and the bottom chord is covered with concrete to form ribbed slab, and the concrete at ribbed slab can possess action of protecting steel bar, so that the floor self-weight can be greatly reduced, and at the same time, the steel grid can be used for hanging form in the course of construction and for bearing construction load.

Description

Light type rib floor and job practices

The present invention relates to a kind of light type rib floor of reinforced concrete building, also relate to the job practices of this structure simultaneously.

Common in-situ reinforced concrete slab, under the moment of flexure effect, the pressure zone concrete plays the resistance to compression effect, and reinforcing bar then is distributed in the tensile region and plays the tension effect.The concrete of tensile region is except that the protection reinforcing bar and floor is had the smooth profile, has only the deadweight that increases floor.Cassette ceiling as for the system of giving then has the shortage globality, the shortcoming of shock resistance difference.In architectural discipline universities and colleges textbook, all have and introduce emerging space truss structure superstructure in modern age.Characteristics such as space truss structure has in light weight, and material is economized, span is big.But common rack is all used steel work, has the shortcoming of antirust ability difference, therefore, does not see to be used for common multi-storey building.

The objective of the invention is to propose a kind of light concrete ribbed slab floor of making reinforcing bar with rack and bearing under the prerequisite of equal load, reduce the deadweight of floor.The present invention also will provide the job practices of this light-duty floor.

The present invention is achieved in that reinforcing bar by two layers of setting, and crisscross, forms flat plate framed structure.Working template is then made by the cuboid of bottom surface four sideband wing plates or the form of terrace with edge, during construction it is suspended on the upper and lower string of rack, be distributed between the crisscross lower edge with becoming clathrate again, and make the wing plate at template edge be spliced to form groove mutually, the lower edge of rack is sunk among the groove.Such structure is because bar frame has certain intensity and rigidity, can in construction, bear moment of flexure, so, can reduce the support under the template and simplify the installation formality of template, water and when smashing concrete is smash flatly on template, and reinforcing bar is all imbedded in the concrete.So, formed by the steel concrete floor of groined type (or other shapes) by the expansion pull portion of curved floor, part in compression then is the thin type slabbed construction, is the T font perpendicular to the part section of floor.Such structure near the neutral line that is subjected to the positive bending moment floor, particularly below the neutral line, has only kept a small amount of concrete as the protection reinforcing bar, and the tension of structure is still born by the reinforcing bar of tensile region.The reinforcing bar of pressure zone and concrete then bear pressure jointly.Like this, the distribution of material relatively is suitable for structure stress, and has alleviated the deadweight of floor widely, also brings convenience for construction.And template used permanent formwork or the disposable template of using repeatedly that adopt.The former can make with steel sheet or other durable materials.After construction is finished it is dismantled the uneven then otherwise processed of floor tension face; The latter can adopt the lightweight cheap material to make hollow flat form, no longer dismounting after the construction, and template becomes the ingredient of building structure like this, and makes floor smooth up and down.

Owing to adopted such scheme, the deadweight of floor can alleviate significantly, thereby can increase span, reduces post beam quantity, reduces basic load.Surcharge is saved in all practicable normalization of bar frame accessory, template, batch production production, reduces labour intensity, shortens the construction period, reduces waste pollution, reduces the main building cost.

The present invention is further illustrated below in conjunction with drawings and Examples.

Fig. 1 is the schematic diagram of light type rib floor of the present invention.

Fig. 2 is used for the ramming ribbed slab floor, can be for the metal form that uses repeatedly.

Fig. 3 is the light type rib floor made from permanent formwork.

Fig. 4 is the light type rib floor made from disposable template.

Embodiment 1: the ribbed slab floor that bears positive bending moment.

With reference to Fig. 1, Fig. 2, Fig. 3, the reinforcing bar of floor short side direction given make little rigid frame or jack truss.The spacing of pressing during construction about 50cm to 1m is evenly distributed in the short side direction of Vierendeel girder, the reinforcing bar of long side direction is welded in both sides up and down with the direction perpendicular to rigid frame (or truss), forms simple rack (1) and the size of rack grid and the size of Fig. 2 template are matched.Use steel wire lashing on reinforcing bar by the aperture on the template Pork-pieces template (3), and wing plate is spliced mutually.In order to make floor do gentlyer, and be convenient to install electric wire and pipeline can be made hole in the middle of floor, the strength and stiffness when improving the rack construction can suitably increase scaffold below template, concrete (2) is watered to smash finish.Treat its setting and hardening, and be the rack steel bar concrete dense rib floor of Fig. 3 behind the stripping.In order to improve the concrete intensity of plate part, can on bar frame (1), install little reinforcing bar or gauze wire cloth (5) again additional.Embodiment 2: smooth up and down ribbed slab floor

With reference to Fig. 4, ground paper or plastics are made hollow light weight form (4), and handle through surface waterproofing, make bar frame by the method for embodiment 1, and template is hung in the middle of each grid.Water and smash rear pattern plate and need not dismantle, become the part of building structure, make floor slab bottoms smooth, and play sound insulation, heat insulation effect.

Claims

1. cast-in-place light-duty close rib steel reinforced concrete floor; it is characterized in that: bar frame (1) is formed multi-ribbed plate with concrete (2); under the moment of flexure effect; the resistance to compression effect that combined of bearing course reinforcing bar and concrete; tension layer reinforcing bar; play the tension effect away from neutral line, a small amount of concrete at floor place plays the usefulness of protection reinforcing bar, and bar frame makes to hang the usefulness of template when construction.

2. bar frame according to claim 1 can give the form of making jack truss or little rigid frame, then assembled on site, be welded.

3. make the back for using repeatedly according to forming panel (3) available metal or other durable materials of the described ribbed slab floor of claim 1, the template (4) that also available lightweight cheap material is made is done disposable use, becomes the ingredient of building structure.

4. in order to improve the concrete strength of plate part, can on bar frame (1), install little reinforcing bar or gauze wire cloth (5) again additional.

5. according to hole being set with weight reduction and help pipe laying and circuit in the middle of the floor of the described ribbed slab floor of claim 1.