CN201952969U

CN201952969U - Novel FRP (Fiber Reinforced Plastic) prestressed concrete slab

Info

Publication number: CN201952969U
Application number: CN2011200242464U
Authority: CN
Inventors: 邓宇; 杨勇; 张鹏; 薛建阳
Original assignee: Xian University of Architecture and Technology; Guangxi University of Science and Technology
Current assignee: Xian University of Architecture and Technology; Guangxi University of Science and Technology
Priority date: 2011-01-25
Filing date: 2011-01-25
Publication date: 2011-08-31
Anticipated expiration: 2021-01-25

Abstract

The utility model relates to a concrete slab in the technical field of civil engineering, in particular to a novel FRP (Fiber Reinforced Plastic) prestressed concrete slab. The concrete slab comprises a concrete slab main body which is formed by casting light aggregate concrete, wherein steel slabs with the same size are arranged at the bottom in the concrete slab main body at equal interval in the transverse direction; a plurality of anchor bolts are welded on each steel slab; an FRP rib high strength concrete slab belt is longitudinally arranged in the concrete slab main body in the length direction of the slab and comprises a high strength concrete slab belt main body and at least two FRP ribs; and the FRP ribs are buried in the high strength concrete slab belt main body. The novel FRP prestressed concrete slab has the advantages of delaying development of a crack, reducing width of the crack, improving rigidity of a member, enhancing strength of the member, improving ductility of the member, fully utilizing the FRP material and the like.

Description

A kind of new type FRP prestressed concrete plate

Technical field

The utility model relates to the concrete slab in a kind of technical field of civil engineering, particularly a kind of new type FRP prestressed concrete plate.

Background technology

In construction work, use armored concrete slab in a large number, because building is in the exposure property environment, corrosion takes place in reinforcing bar easily, when particularly being on the verge of erosion environment conditions such as sea port dock when building, the corrosion problem of reinforcing bar is more serious, has influenced rigidity, intensity and the member ductility of member.Also have the globality of the plate body structure of making still relatively poor, when plate body was a bit stressed, this stress point load-bearing was very big, and power can not be delivered to whole plate body well, makes panel material occur the crack easily, and crack developing speed is very fast.Existing armored concrete slab or cast-in-situ forms, or adopt precast plate, it also exists from great problem, has limited its range of application.

Fibre reinforced plastics (Fiber Reinforced Plastic) are that FRP has good characteristics such as tensile strength height, in light weight, self-diagnostic feature, nonmagnetic and non-corrosiveness, and the FRP bar can be made the shape of plain bars, thereby the FRP muscle is considered to a kind of good substitution material of prestressed reinforcement and plain bars in the prestressed reinforced concrete construction, becomes at present one of research focus of field of civil engineering both at home and abroad.Therefore, replace reinforcing bar to be applied to have broad application prospects in the concrete slab structure in the FRP muscle.The applicant of present patent application applied in 2010 and authorized " the compound reinforced concrete plate of a kind of new type FRP " utility model patent, disclose the concrete slab that the compound muscle of a kind of FRP-PCPs of employing is made, can solve the problem that above-mentioned prior art exists.By test, the applicant of present patent application develops the FRP prestressed concrete plate of another kind of structure again, can solve the problem that above-mentioned prior art exists equally.

Summary of the invention

The technical problems to be solved in the utility model is: provide a kind of have delay crack developing, reduce crack width, improve stiffness of structural member, increase component strength, improve member ductility and make full use of the new type FRP prestressed concrete plate of advantages such as FRP material, to solve the weak point that exists in the above-mentioned present technology.

The technical scheme that solves the problems of the technologies described above is: a kind of new type FRP prestressed concrete plate, comprise the concrete slab main body that forms by the cast light weight aggregate concrete, the steel plate that same size is arranged in the horizontal equidistant placement of concrete slab main body inner bottom part, be welded with some crab-bolts on every block plate, in the concrete slab main body, vertically prolong the plate length direction and on steel plate, be furnished with FRP muscle high-strength concrete strip, described FRP muscle high-strength concrete strip comprises high-strength concrete strip main body and at least 2 FRP muscle, and the FRP muscle is imbedded in the high-strength concrete strip main body.

Described high-strength concrete strip main body two sides also are provided with the rib line, rib line or the perpendicular rib line vertical with high-strength concrete strip main body bottom surface or form the diagonal rib line of 30～60 ° of angle α with high-strength concrete strip main body bottom surface.

Described FRP muscle is CFRP muscle, GFRP muscle, BFRP muscle or AFRP muscle.

Because adopt said structure, the compound reinforced concrete plate of a kind of new type FRP of the utility model has following beneficial effect:

1. because the interior lower disposed of the utility model concrete slab main body has FRP muscle high-strength concrete strip, can delay concrete slab crack and carry out, reduce crack width, improve stiffness of structural member, increase component strength, improve member ductility; In addition, the FRP muscle high-strength concrete strip that adopts in the utility model concrete slab main body can be prefabricated in batches, compare with common pre-stress FRP muscle, FRP muscle high-strength concrete strip also has advantages such as easy construction and ductility is better, and because FRP muscle high-strength concrete strip can be carried out prefabrication and customization, the fabricating quality of strip and mechanical property can obtain strict control, can shorten the construction period greatly again, have significant advantage, especially the repairing maintenance works for bridge has significant meaning more.

2.FRP that material has is anticorrosive, underrelaxation, advantage such as non magnetic, the utility model replaces reinforcing bar can utilize its good anti-corrosion with the FRP muscle, and the infringement of avoiding corrosion that concrete slab is brought reduces the structural maintenance expense; The FRP muscle can also apply prestressing force easily, improves the concrete slab supporting capacity, makes full use of the FRP material, saves cost.

3. the utility model is combined into one FRP muscle, high-strength concrete, has anti-fatigue performance preferably, is applicable in the bridge engineering; Because from heavy and light, ductility is good, intensity is high, the utility model has sizable application prospect in engineerings such as Longspan Bridge, large bay floor, basement roof; In addition, the utility model is reinforced in the maintenance at old bridge has better advantage, by changing bridge deck, can make the substructure bearing load obtain bigger reduction, thereby be equivalent to improve the supporting capacity of old bridge.

In addition, the utility model is compared maximum difference and is that the utility model principal rod has adopted pre-stress FRP muscle high-strength concrete strip to replace the compound muscle of pre-stress FRP muscle high-strength concrete before with " the compound reinforced concrete plate of a kind of new type FRP " of the applicant's application before, strip overcomes the little shortcoming in compound rib component cross section, more help avoiding owing to the local squeeze and destroy that applies the strip end that higher prestressing force causes, supporting capacity increases substantially than compound muscle.Thereby the utility model integral body has promoted the load-bearing ability of concrete slab.Secondly, the utility model has the steel plate of same size in the horizontal equidistant placement of concrete slab main body inner bottom part, is welded with some crab-bolts on every block plate, vertically prolongs the plate length direction and be furnished with FRP muscle high-strength concrete strip in the concrete slab main body on steel plate.This design both can be fixed on strip on the steel plate by crab-bolt easily, but can support the concrete slab that crab-bolt fixedly is overlapped to form random length and span to time-limited strip by steel plate again, be particularly useful for bridge deck, simultaneously, the steel plate of bottom transverse equidistant placement can be connected with concrete beam easily with the girder steel of concrete slab below again, forms combined beam structure.At last, performances such as cracking moment of the present utility model, ultimate bending moment, amount of deflection have raising by a relatively large margin.

Below, the technical characterictic to the new type FRP prestressed concrete plate of the utility model is further described in conjunction with the accompanying drawings and embodiments.

Description of drawings

The new type FRP prestressed concrete plate structural representation of Fig. 1～Fig. 2: the utility model embodiment one:

Fig. 1: the main A-A sectional view of looking sectional view, Fig. 2: Fig. 1.

Fig. 3～Fig. 5: the FRP muscle high-strength concrete strip structural representation of the utility model:

Fig. 3: front view (being provided with the diagonal rib line), Fig. 4: left view (being provided with the diagonal rib line), Fig. 5: left view (being provided with perpendicular rib line).

Among the figure: 1-concrete slab main body, the 2-steel plate, the 3-crab-bolt, 4-FRP muscle high-strength concrete strip, 41-high-strength concrete strip main body, the 42-FRP muscle, 431-diagonal rib line, 432-erects the rib line.

The specific embodiment

Embodiment one:

A kind of new type FRP prestressed concrete plate is (referring to Fig. 1～Fig. 2), comprise the concrete slab main body 1 that forms by the cast light weight aggregate concrete, the steel plate 2 that same size is arranged in the horizontal equidistant placement of concrete slab main body 1 inner bottom part, be welded with some crab-bolts 3 on every block plate, in concrete slab main body 1, vertically prolong the plate length direction and on steel plate, be furnished with FRP muscle high-strength concrete strip 4, described FRP muscle high-strength concrete strip 4 comprises high-strength concrete strip

main body

41 and 2 FRP muscle 42, and the FRP muscle is imbedded in the high-strength concrete strip main body.After treating that concrete reaches design strength, the pre-stress FRP muscle combines the FRP muscle high-strength concrete strip that has formed suitable axial tension with high-strength concrete.FRP muscle high-strength concrete strip 4 is vertical with steel plate, FRP muscle high-strength concrete strip 4 is by being fixed on tensile region, the crab-bolt 3 spacing formation the utility model bottom arrangement of reinforcement on the steel plate, crab-bolt 3 can prevent that FRP muscle high-strength concrete strip 4 is subjected to displacement, and crab-bolt 3 can play the effect that increases steel plate and concrete slab main body 1 bonding simultaneously.

A kind of conversion as present embodiment, described high-strength concrete strip main body 41 two sides also are provided with the rib line, and rib line or the perpendicular rib line 432 vertical with high-strength concrete strip main body bottom surface or the diagonal rib line 431(that forms 30～60 ° of angle α with high-strength concrete strip main body bottom surface are referring to Fig. 3～Fig. 5).

FRP muscle described in the utility model can be CFRP muscle (carbon fibre bar), GFRP muscle (glass fiber muscle), BFRP muscle (basalt fibre muscle) or AFRP muscle (aramid fiber reinforced plastic bars), and the diameter of FRP muscle, prestressing force level are determined according to the actual loading of primary structure member.The sectional dimension of the utility model high-strength concrete strip main body, the radical that is imbedded at the FRP muscle in the high-strength concrete strip main body determine by computational analysis that according to the engineering actual conditions spacing of adjacent two FRP muscle generally equates.The quantity of the FRP muscle high-strength concrete strip that is provided with in the described concrete slab main body is determined by computational analysis according to the engineering actual conditions.

Claims

1. new type FRP prestressed concrete plate, comprise the concrete slab main body (1) that forms by the cast light weight aggregate concrete, it is characterized in that: the steel plate (2) that same size is arranged in the horizontal equidistant placement of concrete slab main body (1) inner bottom part, be welded with some crab-bolts (3) on every block plate, in concrete slab main body (1), vertically prolong the plate length direction and on steel plate, be furnished with FRP muscle high-strength concrete strip (4), described FRP muscle high-strength concrete strip (4) comprises high-strength concrete strip main body (41) and at least 2 FRP muscle (42), and the FRP muscle is imbedded in the high-strength concrete strip main body.

2. a kind of new type FRP prestressed concrete plate according to claim 1, it is characterized in that: described high-strength concrete strip main body (41) two sides also are provided with the rib line, rib line or the perpendicular rib line (432) vertical with high-strength concrete strip main body bottom surface or form the diagonal rib line (431) of 30～60 ° of angle α with high-strength concrete strip main body bottom surface.

3. a kind of new type FRP prestressed concrete plate according to claim 1 and 2 is characterized in that: described FRP muscle is CFRP muscle, GFRP muscle, BFRP muscle or AFRP muscle.