PREFABRICATED LAMINATED SLAB MADE IN ACCORDANCE WITH PRETENSIONING FIBERMESH ANTI-CRACKING PROCESS AND MANUFACTURING METHOD THEREOF

Abstract

Disclosed is a prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process and a manufacturing method thereof, and belongs to the technical field of fabricated structure engineering. The prefabricated laminated slab comprises a concrete layer, fiber grids, distribution bars and truss bars. The fiber grids are subjected to prestress tensioning and pouring to form a novel laminated slab with the pretensioning process, an overall pouring process of layered formworks is adopted, the construction problem during prestress tensioning of the fiber grids of the component can be effectively solved, the crack resistance of the laminated slab can be improved by adopting the prestress grids, the rigidity is increased, and the crack width under normal use conditions is reduced.

Claims

1. A prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process, comprising fiber grids, wherein a concrete layer is arranged above the fiber grids, and the concrete layer is internally provided with distribution bars and truss bars.

2. The prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process according to claim 1, wherein the fiber grids are orthogonal grids with overhanging fiber whiskers, a fiber mesh size of the grid is 20 mm to 50 mm, and the fiber grid is tensioned with a pretensioning method before concrete is poured.

3. The prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process according to claim 2, wherein the thickness of the concrete layer is 60 mm to 120 mm, and the particle size of concrete aggregate adopted by the concrete layer is smaller than the pore diameter of the fiber grid.

4. The prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process according to claim 1, wherein the distribution bars comprise longitudinal distribution bars and transverse distribution bars, and the longitudinal distribution bars and the transverse distribution bars are all located above the fiber grids.

5. The prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process according to claim 4, wherein the truss bars comprise two bottom longitudinal bars, top longitudinal bars and a plurality of connecting bars, the two bottom longitudinal bars are located between the longitudinal distribution bars, the top longitudinal bars are located above the concrete layer, and the two ends of the connecting bars are respectively connected with the bottom longitudinal bars and the top longitudinal bars.

6. A manufacturing method of the prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process according to claim 1, comprising the following steps: step one, mounting formworks, the formworks comprising two long-edge side formworks, a whole bottom formwork, two layered detachable slotted side plates capable of penetrating through a fibermesh, rubber strips for sealing gaps and side plate bolts, mounting the side face formworks on the two sides of the bottom formwork, and mounting lower parts of the layered detachable slotted side plates on the other two sides of the bottom formwork; step two, placing fiber grids in channels of the layered detachable slotted side plates, and mounting the upper parts of the layered detachable slotted side plates; step three, mounting a stretching bed, the stretching bed comprising a rectangular stretching steel rod, a pretension control bolt, a pressure sensor located at the counter-force end and a bolt pin anchor which is special for the fibermesh and located on the other sides of the formworks, fixing one end of the fiber grid through the bolt pin anchor and fixing the other end of the fiber grid to the stretching steel rod, stretching the fiber grids with the pretension control bolt, using a pressure sensor at the counter-force end to complete tension control, and tightening the side plate bolts to compact reserved seams of the side plates; step four, distributing and placing distribution bars and truss bars above the fiber grids, and controlling the height positions of the bars through concrete cushion blocks; step five, completing concrete pouring in the formworks, and carrying out vibration; and step six, carrying out regular maintenance, after the strength of the prefabricated laminated slab reaches a design strength, removing the stretching bed and the formworks to complete the manufacturing of the prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process.

7. The manufacturing method according to claim 6, wherein the fiber grids are orthogonal grids with overhanging fiber whiskers, a fiber mesh size of the grid is 20 mm to 50 mm, and the fiber grid is tensioned with a pretensioning method before concrete is poured.

8. The manufacturing method according to claim 7, wherein the thickness of the concrete layer is 60 mm to 120 mm, and the particle size of concrete aggregate adopted by the concrete layer is smaller than the pore diameter of the fiber grid.

9. The manufacturing method according to claim 6, wherein the distribution bars comprise longitudinal distribution bars and transverse distribution bars, and the longitudinal distribution bars and the transverse distribution bars are all located above the fiber grids.

10. The manufacturing method according to claim 9, wherein the truss bars comprise two bottom longitudinal bars, top longitudinal bars and a plurality of connecting bars, the two bottom longitudinal bars are located between the longitudinal distribution bars, the top longitudinal bars are located above the concrete layer, and the two ends of the connecting bars are respectively connected with the bottom longitudinal bars and the top longitudinal bars.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following describes the present disclosure in detail with reference to the following attached figures.

[0022] FIG. 1 is a front view profile of a prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process in the present disclosure;

[0023] FIG. 2 is a side view profile of a prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process in the present disclosure;

[0024] FIG. 3 is a top view of a stretching bed in the present disclosure;

[0025] FIG. 4 is a space diagram of a stretching bed in the present disclosure; and

[0026] FIG. 5 is a structural schematic diagram of layered detachable slotted side plates in the present disclosure.

[0027] Reference signs: 1, concrete layer; 2, fiber grid; 3, distribution bar; 4, truss bar; 5, formwork; 31, longitudinal distribution bar; 32, transverse distribution bar; 41, bottom longitudinal bar; 42, top longitudinal bar; 43, connecting bar; 51, side formwork; 52, bottom formwork; 53, layered detachable slotted side plate; 54, rubber strip; 55, side plate bolt; 6, stretching bed; 61, stretching steel rod; 62, pretension control bolt; 63, pressure sensor; and 64, bolt pin anchor.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] As shown in FIG. 1 to FIG. 5, a prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process comprises fiber grids 2, wherein a concrete layer 1 is arranged above the fiber grids 2, and the concrete layer is internally provided with distribution bars 3 and truss bars 4.

[0029] Specifically, the thickness of the concrete layer 1 is 60 mm to 120 mm, and the fiber grids 2 are orthogonal grids with overhanging fiber whiskers, so that the adhesive property of the grids is improved, and the problem of concrete layering caused by the fiber grids is solved. The fiber mesh size of the grid is 20 mm to 50 mm and is required to be larger than the particle size of concrete aggregate, so that the aggregate can conveniently penetrate through the grids, the uniformity of the aggregate in the slab is improved, the shrinkage resistance of a protective layer at the bottom of the slab is improved, and the shrinkage cracking probability of the prefabricated slab is reduced. The fiber grid 2 is made of GFRP, CFRP, AFRP, BFRP and other materials, and the fiber grid 2 is tensioned with the pretensioning process before concrete is poured.

[0030] The thickness of the concrete layer 1 is 60 mm to 120 mm, and the particle size of concrete aggregate adopted by the concrete layer 1 is smaller than the pore diameter of the fiber grid 2.

[0031] The distribution bars 3 comprise longitudinal distribution bars 31 and transverse distribution bars 32, and the longitudinal distribution bars 31 and the transverse distribution bars 32 are all located above the fiber grids 2.

[0032] The truss bars 4 comprise two bottom longitudinal bars 41, top longitudinal bars 42 and a plurality of connecting bars 43, the two bottom longitudinal bars 41 are located between the longitudinal distribution bars 31, the top longitudinal bars 42 are located above the concrete layer 1, and the two ends of the connecting bars 43 are respectively connected with the bottom longitudinal bars 41 and the top longitudinal bars 42.

[0033] A manufacturing method of the prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process comprises the following steps:

[0034] step one, mounting formworks 5, the formworks 5 comprising two long-edge side formworks 51, a whole bottom formwork 52, two layered detachable slotted side plates 53 capable of penetrating through a fibermesh, rubber strips 54 for sealing gaps and side plate bolts 55, mounting the side face formworks 51 on the two sides of the bottom formwork 52, and mounting lower parts of the layered detachable slotted side plates 53 on the other two sides of the bottom formwork 52;

[0035] step two, placing fiber grids 2 in channels of the layered detachable slotted side plates 53, and mounting the upper parts of the layered detachable slotted side plates 53;

[0036] step three, mounting a stretching bed 6, the stretching bed 6 comprising a rectangular stretching steel rod 61, a pretension control bolt 62, a pressure sensor 63 located at the counter-force end and a bolt pin anchor 64 which is special for the fibermesh and located on the other sides of the formworks 5, fixing one end of the fiber grid 2 through the bolt pin anchor 64 and fixing the other end of the fiber grid 2 to the stretching steel rod 61, stretching the fiber grids 2 with the pretension control bolt 62, using a pressure sensor 63 at the counter-force end to complete tension control, and tightening the side plate bolts 55 to compact reserved seams of the side plates;

[0037] step four, distributing and placing distribution bars 3 and truss bars 4 above the fiber grids 2, and controlling the height positions of the bars through concrete cushion blocks;

[0038] step five, completing concrete pouring in the formworks 5, and carrying out vibration; and

[0039] step six, carrying out regular maintenance, after the strength of the prefabricated laminated slab reaches a design strength, removing the stretching bed 6 and the formworks 5 to complete the manufacturing of the prefabricated laminated slab made in accordance with a pretensioning fibermesh anti-cracking process.

[0040] Specifically, the whole stretching process of the pretension control bolt can suffer from pressure but cannot suffer from tension. The process is more accurate and economical by using the pressure sensor. The compressive reaction force of the pretension control bolt is used for driving the stretching steel rod to complete tensioning.

[0041] In the third step, the stretching steel rod penetrates through the stretching bed, bed holes are used for restraining the angle of the stretching steel rod, eccentric loading cannot occur in the stretching process, and the process is more stable.

[0042] The upper and lower layered detachable slotted side plates are connected through bolts to design the layered detachable slotted side plates, so that laying and positioning of the fiber grids every time are facilitated. The process is high in repeated utilization rate, green and efficient, and is suitable for industrially producing laminated slabs in prefabricated factory buildings. The height of the fibermesh is controlled by using a slotting design of the detachable slotted side plates, and the position of each bundle of fibers is controlled by using the bolt pin anchor, so that the process is more convenient and efficient and is less disturbed.

[0043] The embodiments described above only describe the preferred manner of the present disclosure and do not limit the scope of the present disclosure, and various modifications and improvements made to the technical solution of the present disclosure by those skilled in the art will fall within the scope of protection as determined by the claims of the present disclosure without departing from the spirit of the design of the present disclosure.