CN213806067U - Steel bar truss prestressed concrete superimposed sheet - Google Patents

Steel bar truss prestressed concrete superimposed sheet Download PDF

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Publication number
CN213806067U
CN213806067U CN202022723612.7U CN202022723612U CN213806067U CN 213806067 U CN213806067 U CN 213806067U CN 202022723612 U CN202022723612 U CN 202022723612U CN 213806067 U CN213806067 U CN 213806067U
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steel bar
bar truss
bars
concrete
prestressed
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CN202022723612.7U
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Inventor
宋涛
连世杰
刘春波
董建军
刘顺凯
时永男
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Weihai Qide New Building Materials Co ltd
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Weihai Qide New Building Materials Co ltd
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Abstract

The invention relates to the technical field of assembled building floor slabs, in particular to a steel bar truss prestressed concrete laminated slab which is characterized by comprising longitudinal prestressed bars, transverse hot-rolled ribbed steel bars, a steel bar truss and a concrete curing layer, wherein the longitudinal prestressed bars which are horizontally and vertically connected with the transverse hot-rolled ribbed steel bars are arranged above the transverse hot-rolled ribbed steel bars side by side, the longitudinal prestressed bars and the transverse hot-rolled ribbed steel bars are connected to form a latticed plane, the steel bar truss is arranged above the latticed plane, the steel bar truss comprises upper chord bars, reinforcing chord bars, lower chord bars and wave-shaped latticed bars, the longitudinal prestressed bars, the transverse hot-rolled ribbed steel bars and the steel bar truss are mutually connected and then are cured into the concrete laminated slab through the concrete curing layer, and the upper end of the steel bar truss extends out of the upper end surface of the concrete curing layer High strength, space structure rigidity far superior to that of common steel bar truss, etc.

Description

Steel bar truss prestressed concrete superimposed sheet
Technical Field
The invention relates to the technical field of fabricated building floors, in particular to a steel bar truss prestressed concrete composite slab which is simple in structure, ensures the quality of a large-span slab in the hoisting and installation processes, and solves the problem of large deflection of the large-span slab after installation.
Background
As is well known, in recent years, as the nation has vigorously pushed the development of fabricated buildings, precast concrete composite floor slabs have been widely popularized. However, since the common laminated slab is only 60mm thick and has weak out-of-plane rigidity, and is mostly used for building floors with span less than 6 meters, when the span is more than 6 meters, the common laminated slab is easy to crack in the hoisting process, the deflection of the installed rear slab is large, the appearance is affected, and the existing transverse steel bars and longitudinal steel bars are uniformly distributed, and the single latticed gap cannot penetrate through the pre-embedded threading box, so that the threading pipe needs to be accommodated after the transverse steel bars or the longitudinal steel bars are cut, the steel bars are damaged, and the overall performance is affected.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide the steel bar truss prestressed concrete composite slab which has a simple structure, ensures the quality of a large-span slab in the hoisting and installation processes, and solves the problems of large deflection and the like of the large-span slab after the installation.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a steel bar truss prestressed concrete laminated slab is characterized by comprising longitudinal prestressed tendons, transverse hot-rolled ribbed steel bars, steel bar trusses and concrete curing layers, wherein the transverse hot-rolled ribbed steel bars are transversely arranged at intervals, the longitudinal prestressed tendons vertically connected with the transverse hot-rolled ribbed steel bars in the horizontal direction are arranged above the transverse hot-rolled ribbed steel bars side by side, the longitudinal prestressed tendons are longitudinally and sequentially arranged alternately at unequal intervals, the longitudinal prestressed tendons and the transverse hot-rolled ribbed steel bars are connected to form a latticed plane, the steel bar trusses which are mutually spaced and parallel to the longitudinal prestressed tendons are arranged above the latticed plane, each steel bar truss comprises an upper chord tendon, a reinforcing chord, a lower chord and wave-shaped lattice tendons, the wave-shaped lattice tendons are provided with two wave-shaped lattice tendons, the upper ends of the two wave-shaped lattice tendons are close to each other and connected through the upper chord tendon, the outer sides of the lower ends of the two wave-shaped lattice tendons are respectively connected with the lower chord and far away from each other, the reinforced chord rib is arranged below the upper chord rib and is connected with the wave-shaped lattice rib, the lower end of the wave-shaped lattice rib and the lower chord rib are connected with the transverse hot-rolled ribbed steel bar, the longitudinal prestressed rib, the transverse hot-rolled ribbed steel bar and the steel bar truss are mutually connected and then solidified into a concrete laminated slab through a concrete solidified layer, and the upper end of the steel bar truss extends out of the upper end surface of the concrete solidified layer.
The longitudinal prestressed tendon of the invention adopts a stress-relieving spiral ribbed steel wire with the diameter of 4-12 mm.
The tension control stress of the longitudinal prestressed tendon is 0.4-0.6 times of the standard value of the tensile strength of the steel bar.
The standard value of the strength of the steel bar is 1470-1860N/mm 2.
The diameter of the reinforcing chord rib is larger than that of the upper chord rib, so that the overall strength of the steel bar truss is improved.
The diameter of the upper chord rib and the diameter of the lower chord rib are 6-12 mm, and the diameter of the reinforcing chord rib is 10-16 mm.
The overall height of the steel bar truss is 80-180 mm, the width between lower chord ribs of the steel bar truss is 60-100 mm, the width of a wave unit of a wave-shaped lattice rib of the steel bar truss is 100-300 mm, the connection width of the upper end of the wave-shaped lattice rib and the upper chord rib is 20mm, and the connection width of the lower end of the wave-shaped lattice rib and the lower chord rib is 20 mm.
The thickness of the concrete curing layer is 60-100 mm, and the concrete curing layer is prepared by adopting C30-C60 concrete.
The height of the upper end of the steel bar truss extending out of the upper end face of the concrete curing layer is 50-140 mm.
By adopting the structure, the invention has the advantages of simple structure, good integrity, high strength, space structure rigidity far higher than that of a common steel bar truss and the like.
Drawings
Fig. 1 is a pattern diagram of a steel bar truss prestressed composite slab according to the present invention.
Fig. 2 is a reinforcement arrangement diagram of the steel bar truss prestressed composite slab according to the present invention.
Fig. 3 is a sectional view taken along line a-a of fig. 1.
Fig. 4 is a sectional view taken along line B-B of fig. 1.
Fig. 5 is a detailed view of the arrangement of the unequal-interval reinforcing bars of fig. 1.
Fig. 6 is a detailed view of the high rigidity space steel bar truss of fig. 1, wherein 6-1 is a front view and 6-2 is a side view. .
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in the attached drawings, the steel bar truss prestressed concrete laminated slab is characterized by comprising longitudinal prestressed bars 1, transverse hot-rolled ribbed steel bars 2, steel bar trusses 3 and concrete curing layers 4, wherein the transverse hot-rolled ribbed steel bars 2 are transversely arranged at intervals of 120mm, the longitudinal prestressed bars 1 which are vertically connected with the transverse hot-rolled ribbed steel bars 2 in the horizontal direction are arranged above the transverse hot-rolled ribbed steel bars 2 side by side, the longitudinal prestressed bars 1 are longitudinally and sequentially and alternately arranged at intervals of 50mm and 100mm, the longitudinal prestressed bars 1 and the transverse hot-rolled ribbed steel bars 2 are connected to form a latticed plane, steel bar trusses 3 which are arranged above the latticed plane at intervals of 450mm and are parallel to the longitudinal prestressed bars 1, each steel bar truss 3 comprises an upper chord steel bar 5, a chord reinforcing steel bar 6, a lower chord steel bar 7 and a wave-shaped latticed steel bar 8, the wave-shaped latticed steel bar 8 is provided with two wave-shaped bars, the upper ends of the two wave-shaped lattice ribs 8 are close to each other and are connected through the upper chord rib 5, the outer sides of the lower ends of the two wave-shaped lattice ribs 8 are respectively connected with the lower chord rib 7 and are far away from each other, the reinforcing chord rib 6 is arranged below the upper chord rib 5 and is connected with the wave-shaped lattice ribs 8, the lower ends of the wave-shaped lattice ribs 8 and the lower chord ribs 7 are connected with the transverse hot-rolled ribbed steel bar 2, the longitudinal prestressed rib 1, the transverse hot-rolled ribbed steel bar 2 and the steel bar truss 3 are mutually connected and then solidified into a concrete laminated slab through the concrete solidified layer 4, and the upper end of the steel bar truss 3 extends out of the upper end face of the concrete solidified layer 4.
Furthermore, the longitudinal prestressed tendon 1 adopts a stress-relieving spiral ribbed steel wire with the diameter of 5 mm.
Furthermore, the tension control stress of the longitudinal prestressed tendon 1 is 0.6 times of the standard value of the tensile strength of the steel bar.
Furthermore, the standard value of the prestressed reinforcement strength is 1570N/mm 2.
Furthermore, the diameter of the reinforcing chord 6 is larger than that of the upper chord 5, so that the overall strength of the steel bar truss 3 is increased.
Furthermore, the diameters of the upper chord ribs 5 and the lower chord ribs 7 are 8mm, and the diameter of the reinforcing chord ribs 6 is 12 mm.
Further, the overall height of the steel bar truss 3 is 150mm, the width between the lower chord ribs 7 of the steel bar truss 3 is 80mm, the wave unit width of the wave-shaped lattice rib 8 of the steel bar truss 3 is 200mm, the connection width of the upper end of the wave-shaped lattice rib 8 and the upper chord rib 5 is 20mm, and the connection width of the lower end of the wave-shaped lattice rib 8 and the lower chord ribs 7 is 20 mm.
Further, the thickness of the cured concrete layer 4 is 70mm, and the cured concrete layer 4 is prepared by using C40 concrete.
Further, the height of the upper end of the steel bar truss 3 extending out of the upper end face of the concrete curing layer 4 is 100-110 mm.
Further, the steel bar truss upper end be connected with the lug, the concrete curing layer is stretched out to the upper end of lug, the diameter of wave lattice muscle be 6 mm.
The steel bar truss 3 prestressed concrete laminated slab adopts a pretensioning method prestressed technology, the plate bottom stress steel bars in the plate span direction adopt high-strength prestressed steel bars with the diameter of 5mm, namely stress-relieving spiral ribbed steel wires, the standard value of the tensile strength of the steel bar is 1570N/mm2, prestress is applied to the prestressed steel bars through a steel bar tensioning machine, and the tensioning control stress of the prestressed steel bars is 0.6 times of the standard value of the tensile strength of the steel bars.
The prestressed concrete laminated slab with the steel bar truss 3 effectively solves the problem of large-span floor slab cracks by adopting a prestressing technology, the tensile strength of concrete is very low, the tensile stress of the surface of the concrete is greater than the tensile strength of the concrete due to the application of load, after the prestressing technology is adopted, the compressive stress is applied to the concrete in advance by the prestressing, and only after the applied load offsets the pre-compressive stress of the surface of the concrete, the tensile stress generated by the residual load on the surface of the concrete is greater than the tensile strength of the concrete, the cracks are generated on the surface of the concrete, namely the anti-cracking capability of the concrete is improved by the prestressing technology.
The steel bar truss 3 prestressed concrete laminated slab adopts the high-rigidity space steel bar truss 3, the rigidity of the steel bar truss 3 is far greater than that of the common steel bar truss 3, when prestress is applied to the concrete laminated slab, the common steel bar truss 3 is insufficient in rigidity, and the laminated slab can deform due to the applied prestress, so that the slab surface is uneven. When the high-rigidity space steel bar truss 3 is adopted, the rigidity of the truss is enough to resist the prestress applied to the concrete laminated slab, the laminated slab can be effectively prevented from deforming, the problem of large deflection of the large-span slab is solved, and the quality of the laminated slab is ensured.
The steel bar truss 3 prestressed concrete laminated slab provided by the invention adopts the steel bar arrangement with unequal intervals for the first time. Under the condition of meeting the requirement of the specification on the minimum reinforcement ratio of the steel bars, the prestressed steel bars are alternately arranged at intervals of 50mm and 100mm and are symmetrically arranged, and the arrangement of the steel bars has the advantages that the threading boxes (with the diameter of 80 mm) reserved in the laminated slab can be reserved in gaps of the steel bars, which are indirect by 100mm, then concrete is poured, the steel bars are survived once, and the problems that the wire boxes cannot be placed due to the arrangement of the steel bars at equal intervals, the concrete of the laminated slab needs to be poured, and the wire boxes are reserved after the concrete reaches the strength and are drilled on the concrete twice. Meanwhile, the problem that secondary opening of the prestressed laminated slab breaks the prestressed reinforcement is also solved.
Examples
The steel bar truss 3 prestressed concrete laminated slab comprises longitudinal prestressed bars 1, transverse hot-rolled ribbed steel bars 2 and high-rigidity space steel bar trusses 3 and 70mmC40 concrete. Vertical prestressed reinforcement 1 adopts the stress-relieving spiral ribbed steel wire of diameter 5mm, its tensile strength standard value is 1570N/mm2, exert prestressing force to the prestressed reinforcement through the reinforcing bar tensioning machine one by one, prestressed reinforcement's stretch-draw control stress is taken to be 0.6 times of reinforcing bar tensile strength standard value, vertical prestressed reinforcement 1 adopts 50mm and 100mm interval to arrange in turn, symmetrical arrangement, arrange in turn and can satisfy the standard under the condition that requires to minimum reinforcement ratio, reserve enough interval and place pre-buried line box, the problem that prestressed laminated slab secondary trompil breaks the prestressed reinforcement has been avoided. The problem that the prestressed reinforcing steel bars are not uniformly distributed can be solved by symmetrically arranging the reinforcing steel bars, the transverse reinforcing steel bars adopt HRB400 common hot-rolled ribbed reinforcing steel bars, and the spacing between the reinforcing steel bars is executed according to the design requirements of a project drawing, and is generally 120 mm.
Fig. 5 and 6 show a high-rigidity space steel bar truss 3, the truss ingeniously utilizes a triangular layout of the truss to weld a reinforcing chord rib 6 and web ribs on two sides of the truss, a double-layer space structure is formed, the rigidity of the space structure is far higher than that of a common steel bar truss 3, the requirement of the prestressed laminated slab on the rigidity of the outer surface of the slab can be met, and the unit of the width shown in the drawing is mm.
The invention provides a precast concrete composite floor slab adopting a pretensioning method prestress technology and using a high-rigidity space steel bar truss 3, which ensures the quality of a large-span plate in the hoisting and installation processes and solves the problem of large deflection of the large-span plate after the installation is finished.

Claims (9)

1. A steel bar truss prestressed concrete laminated slab is characterized by comprising longitudinal prestressed tendons, transverse hot-rolled ribbed steel bars, steel bar trusses and concrete curing layers, wherein the transverse hot-rolled ribbed steel bars are transversely arranged at intervals, the longitudinal prestressed tendons vertically connected with the transverse hot-rolled ribbed steel bars in the horizontal direction are arranged above the transverse hot-rolled ribbed steel bars side by side, the longitudinal prestressed tendons are longitudinally and sequentially arranged alternately at unequal intervals, the longitudinal prestressed tendons and the transverse hot-rolled ribbed steel bars are connected to form a latticed plane, the steel bar trusses which are mutually spaced and parallel to the longitudinal prestressed tendons are arranged above the latticed plane, each steel bar truss comprises an upper chord tendon, a reinforcing chord, a lower chord and wave-shaped lattice tendons, the wave-shaped lattice tendons are provided with two wave-shaped lattice tendons, the upper ends of the two wave-shaped lattice tendons are close to each other and connected through the upper chord tendon, the outer sides of the lower ends of the two wave-shaped lattice tendons are respectively connected with the lower chord and far away from each other, the reinforced chord rib is arranged below the upper chord rib and is connected with the wave-shaped lattice rib, the lower end of the wave-shaped lattice rib and the lower chord rib are connected with the transverse hot-rolled ribbed steel bar, the longitudinal prestressed rib, the transverse hot-rolled ribbed steel bar and the steel bar truss are mutually connected and then solidified into a concrete laminated slab through a concrete solidified layer, and the upper end of the steel bar truss extends out of the upper end surface of the concrete solidified layer.
2. The steel bar truss prestressed concrete composite slab as claimed in claim 1, wherein said longitudinal prestressed reinforcement is a stress-relieving spiral ribbed steel wire with a diameter of 4-12 mm.
3. The steel bar truss prestressed concrete composite slab as claimed in claim 2, wherein the tensile control stress of the longitudinal prestressed reinforcement is 0.4-0.6 times of the standard value of the tensile strength of the steel bar.
4. The steel bar truss prestressed concrete composite slab as claimed in claim 3, wherein said steel bar strength standard value is 1470-1860N/mm 2.
5. A steel-reinforced truss prestressed concrete composite slab as claimed in claim 1, wherein said reinforcing chord has a diameter larger than that of said upper chord.
6. The steel bar truss prestressed concrete composite slab as claimed in claim 5, wherein the diameter of the upper chord rib and the diameter of the lower chord rib are 6-12 mm, and the diameter of the reinforcing chord rib is 10-16 mm.
7. The steel bar truss prestressed concrete composite slab as claimed in claim 1, wherein the overall height of the steel bar truss is 80-180 mm, the width between the lower chord ribs of the steel bar truss is 60-100 mm, the wave unit width of the wave-shaped lattice ribs of the steel bar truss is 100-300 mm, the connection width of the upper ends of the wave-shaped lattice ribs and the upper chord ribs is 20mm, and the connection width of the lower ends of the wave-shaped lattice ribs and the lower chord ribs is 20 mm.
8. The steel bar truss prestressed concrete laminated slab as claimed in claim 1, wherein the thickness of the concrete cured layer is 60-100 mm, and the concrete cured layer is prepared from C30-C60 concrete.
9. The steel bar truss prestressed concrete composite slab as claimed in claim 1, wherein the height of the upper end of said steel bar truss extending beyond the upper end face of the concrete cured layer is 50-140 mm.
CN202022723612.7U 2020-11-23 2020-11-23 Steel bar truss prestressed concrete superimposed sheet Active CN213806067U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112324037A (en) * 2020-11-23 2021-02-05 威海齐德新型建材有限公司 Steel bar truss prestressed concrete laminated slab and manufacturing method thereof
CN113482217A (en) * 2021-08-12 2021-10-08 西安五和土木工程新材料有限公司 Truss laminated slab and manufacturing method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112324037A (en) * 2020-11-23 2021-02-05 威海齐德新型建材有限公司 Steel bar truss prestressed concrete laminated slab and manufacturing method thereof
CN113482217A (en) * 2021-08-12 2021-10-08 西安五和土木工程新材料有限公司 Truss laminated slab and manufacturing method thereof

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