CN112031236A - Detachable upper-bearing type steel bar truss laminated slab - Google Patents
Detachable upper-bearing type steel bar truss laminated slab Download PDFInfo
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- CN112031236A CN112031236A CN202010969434.8A CN202010969434A CN112031236A CN 112031236 A CN112031236 A CN 112031236A CN 202010969434 A CN202010969434 A CN 202010969434A CN 112031236 A CN112031236 A CN 112031236A
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- steel bar
- bar truss
- bottom plate
- slab
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a detachable deck type steel bar truss laminated slab, relates to the field of building structures, and solves the problems of waste of steel bar trusses, small slab span, excessive support, large slab thickness, difficulty in passing through electromechanical pipelines, complex installation and construction, prolonged construction period and the like of the existing steel bar truss prefabricated slab. The technical scheme adopted by the invention is as follows: the steel bar truss in the conventional steel bar truss precast slab is placed on the upper surface of a square frustum pyramid protruding from the upper surface of a precast bottom plate, a pre-buried steel plate and connecting steel bars are welded on lower chord steel bars of the steel bar truss, the steel bars are anchored into the precast bottom plate, the central line of a horizontal support at the bottom of the precast bottom plate is coincided with the central line of the protruding square frustum pyramid, and after post-cast concrete on the precast bottom plate reaches the designed strength, the connecting steel bars are cut off to detach the steel bar truss so as to be convenient for use in next turnover.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a detachable deck type steel bar truss composite slab applied to an assembly type reinforced concrete building.
Background
The construction template of the cast-in-place floor slab of the reinforced concrete building usually adopts detachable wood plywood, steel molds or aluminum molds, the repeated disassembly and assembly is labor-consuming and time-consuming, and the number of template supports is large. In recent years, a formwork-free construction technology using a steel bar truss precast slab as a permanent construction formwork for a floor slab and the like are widely applied. In the prefabricated slab, two lower chord reinforcements of a triangular reinforcement truss and part of diagonal web member reinforcements are embedded in the prefabricated slab, and the rest of the truss reinforcements are exposed above the prefabricated slab.
The precast slab has been found in engineering practice to have certain drawbacks: 1. the cast-in-place floor slab of the conventional residential building is a bidirectional slab, the span is not more than 4.5m, and the slab thickness is about 100mm generally. If the steel bar truss precast slab is adopted, the thickness of the slab is not less than 60mm according to the specification, and in order to enable the electromechanical pipeline to smoothly pass through the truss post-cast layer concrete, the thickness of the slab is about 70 mm-80 mm, the total thickness of the slab is about 130 mm-140 mm, the thickness of the slab is about 30-40% larger than that of a cast-in-place slab, and the self weight of the structure is increased, so that materials are wasted. The space distance between the upper chord steel bar of the truss and the upper surface of the prefabricated plate is only about 25-40 mm, and the difficulty of the electromechanical pipeline in passing through the truss is increased due to the fact that the distance is too small.
2. The existence of the steel bar truss in the temporary construction state improves the rigidity and the bending resistance bearing capacity of the precast slab, increases the occlusion effect between the post-cast concrete and the precast bottom slab in the later use state, and in addition, the steel bar truss hardly has any help to the bearing capacity of the precast slab, and is used as a temporary tool to be wasted in the concrete of the precast slab.
3. As a combined stress member of reinforcing steel bars and concrete, the existing precast slab breaks away from the basic principle of combined stress of the steel and the concrete and does not fully exert the advantages of high tensile strength of the reinforcing steel bars and high compressive strength of the concrete. When the load is applied, the lower chord steel bar of the truss and the adjacent part of concrete bear the tensile force under the action of the midspan positive bending moment of the prefabricated bottom plate, the advantage of higher compressive strength of the concrete is not fully exerted, the pressure borne by the upper chord steel bar of the slender truss is volatile and stable, and the advantage of higher tensile bearing capacity of the slender steel bar is not exerted.
4. The joint of the existing precast slab and the post-cast concrete has natural defects, and the thickness of the post-cast layer concrete at the slab end (side) is too thin, so that the in-plane shear rigidity of the floor slab is reduced, and the plane integral rigidity of the floor slab is weakened. If the thickness of the prefabricated plate bottom plate can be reduced and the thickness of the post-cast concrete can be increased, the integral rigidity of the floor can be improved.
5. The periphery of the existing precast slab is generally reserved with reinforcing steel bars extending out of the slab edge, and the construction is troublesome due to collision of the reinforcing steel bars and the beam longitudinal steel bars when the reinforcing steel bars are installed on site.
Disclosure of Invention
The detachable upper bearing type steel bar truss is superposed, so that the defect of material waste caused by the fact that the steel bar truss cannot be used repeatedly is overcome, and the problems that the span of the existing prefabricated slab is small, the number of supports is large, the thickness of the slab is large, the weight is too heavy, an electromechanical pipeline is difficult to pass through, the installation is troublesome, the construction is complicated, the construction period is prolonged, the construction cost is too high and the like are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the steel bar truss originally poured inside the traditional precast slab is placed on the upper surface of the square prismoid protruding from the upper surface of the precast bottom plate, the connecting steel plate is welded on the lower chord steel bar of the truss, the steel plate is connected with the connecting steel plate pre-buried on the upper surface of the square prismoid through bolts, and the steel bar truss can be detached and used for multiple times after the post-cast concrete pouring forming reaches the design strength.
The upper surface of the prefabricated bottom plate is provided with a protruding square prismoid, and the center of the upper surface of the prismoid is provided with a pre-buried threaded sleeve.
And secondly, the steel bar truss is not positioned in the precast slab any more, and the lower chord of the steel bar truss and the surface of the precast slab post-cast concrete are positioned on the same horizontal plane, so that the gap between the square prismatic tables is convenient for the electromechanical pipeline to pass through, the precast bottom plate can be made thinner, the material is saved, the dead weight is reduced, and the on-site hoisting and installation are facilitated.
Thirdly, the lower chord of the steel bar truss is welded with connecting steel bars which are anchored into the prefabricated floor and have the distance not more than 450mm, and the connecting steel bars and the prefabricated bottom plate can be detached separately.
Fourthly, after the prefabricated bottom plate is installed in place on a construction site, the central line of the horizontal support at the bottom of the prefabricated bottom plate is superposed with the central line of the square terrace with edges, the horizontal support is perpendicular to the truss and arranged, and the distance between the horizontal supports is not more than 1200 mm.
And fifthly, pouring a layer of post-cast concrete on the prefabricated bottom plate. After the post-cast concrete on the prefabricated bottom plate reaches the design strength, the connecting steel bars are cut off, and then the steel bar truss is disassembled so as to be used for the next turnover.
Sixth, the steel bar truss and the prefabricated bottom plate can be detached separately, the steel bar truss can be made into a standard component, the structural mechanical property of the prefabricated bottom plate after forming can be flexibly adjusted through the parameters such as the geometric dimension, the number and the spacing of the steel bar truss, the number and the spacing of the connecting pieces, and the like, and the use requirements of prefabricated plates with various spans can be met.
Seventhly, the four sides of the prefabricated plate are not provided with the steel bars and extend out, so that the difficulty in prefabricating, producing, transporting, hoisting and installing the prefabricated bottom plate is simplified, the manufacturing cost of the superposed floor is reduced, and the construction period is shortened.
Eighth, the steel bar truss provided by the invention can be replaced by section steel (such as I-shaped steel, channel steel and the like), the material is easy to obtain, and the steel bar truss can be removed and recycled for multiple times, so that the steel bar truss meets the green construction concept of environmental protection, energy conservation, low carbon and emission reduction.
The prefabricated slab of the invention has the following direct effects: the stress basic mode of the existing steel bar truss precast slab is overturned, the huge defect that the steel bar truss in the existing steel bar truss precast slab cannot be used circularly to cause material waste is completely overcome, the thickness of the precast slab is smaller, the span can be larger, the support is reduced, and the construction speed is accelerated. The prefabricated slab has great social benefit and economic value, and greatly promotes the development of modern fabricated reinforced concrete building.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
FIG. 1 is a three-dimensional schematic view of a prefabricated floor and raised square prism table of the present invention.
Fig. 2 is a three-dimensional schematic view of a prefabricated base plate and a raised square frustum of a pyramid and a steel truss according to the present invention.
Fig. 3 is a three-dimensional schematic view of the precast floor cast-in-place concrete of the present invention.
Fig. 4 is a three-dimensional schematic diagram of the cast-in-place concrete after the prefabricated base plate is poured.
Fig. 5 is an overall three-dimensional schematic view of the prefabricated base plate with the steel bar truss removed.
The method comprises the following steps of 1-prefabricating a bottom plate, 2-protruding square prismatic tables, 3-steel bar trusses, 4-connecting steel bars anchored into the prefabricated bottom plate, and 5-post-pouring concrete.
Detailed Description
The most key concept of the invention is as follows: the steel bar truss is placed on the upper surface of the square frustum pyramid protruding from the upper surface of the prefabricated bottom plate and fixed by bolts, the lower chord of the steel bar truss and the upper surface of the prefabricated bottom plate have a height enough for an electromechanical pipeline to pass through, the lower chord of the steel bar truss is welded with a connecting steel bar anchored in the prefabricated bottom plate, the steel bar serves as a vertical support of the prefabricated bottom plate, the steel bar truss can be detached for multiple times and can be used repeatedly, materials are saved, waste is reduced, the thickness of the plate is reduced, and temporary support under the prefabricated bottom plate is reduced.
In order to explain technical contents, structural features, objects, and effects of the present invention in detail, the present invention will be explained in detail with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, 2, 3 and 4, the detachable deck type steel bar truss composite slab of the present invention includes a prefabricated base plate 1, a protruding square frustum 2, a steel bar truss 3 and a connecting steel bar 4 anchored into the prefabricated base plate.
Further, the method comprises the following steps: the thickness of the prefabricated base plate 1 is thinner than that of the conventional prefabricated plate and can be as thin as 35 mm.
Further, the method comprises the following steps: the upper surface of the prefabricated bottom plate 1 is provided with longitudinal and transverse stressed steel bars according to the design requirements of drawings, wherein the longitudinal steel bars are positioned on the lower layer, and the longitudinal steel bars are transversely positioned on the upper layer.
Further, the method comprises the following steps: and reinforcing steel bars do not extend out of the periphery of the prefabricated bottom plate 1.
Further, the method comprises the following steps: the longitudinal and transverse stressed steel bars of the surface of the prefabricated bottom plate 1 are poured and covered by post-cast concrete, so that the protective layer can be smaller than the requirement of construction specifications, the width of a crack is also controlled to be not more than 0.2mm in the temporary construction stage, and the crack is poured and covered by the post-cast concrete, so that the normal use is not influenced.
Further, the method comprises the following steps: after the prefabricated bottom plate 1 is installed in place on a construction site, the center line of the horizontal support at the bottom of the prefabricated bottom plate coincides with the center line of the square terrace with edge 2, the horizontal support is perpendicular to the truss and arranged, and the distance between the horizontal supports is not more than 1200 mm.
Further, the method comprises the following steps: the convex square prismatic table 2 is a square prismatic table, and a threaded sleeve is pre-embedded in the center of the upper surface.
Further, the method comprises the following steps: the steel bar truss 3 is placed on the upper surface of the convex square prismatic table 2, and a connecting steel plate is welded on the steel bar truss 3 at the intersection of the steel bar truss and the convex square prismatic table and is connected with the embedded threaded sleeves through bolts.
Further, the method comprises the following steps: and a connecting steel bar 4 anchored in the prefabricated bottom plate 1 is welded on the lower chord of the steel bar truss 3, and the steel bar is used as a vertical support of the prefabricated bottom plate 1 and transmits the vertical load of the prefabricated bottom plate to the steel bar truss 3.
Further, the method comprises the following steps: and after the post-cast concrete on the prefabricated bottom plate 1 reaches the designed strength, the connecting steel bars 4 are cut off, and then the steel bar truss 3 is disassembled so as to be used for the next turnover.
Claims (7)
1. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: the steel bar truss structure comprises a prefabricated bottom plate and a triangular steel bar truss, wherein longitudinal and transverse bidirectional stressed steel bars are arranged on the upper surface of the prefabricated bottom plate.
2. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: the upper surface of the prefabricated bottom plate is provided with a convex square prismoid, and the center of the upper surface of the prismoid is provided with a pre-buried threaded sleeve.
3. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: the distance between the centers of the prismatic tables along the short direction of the bottom plate is not more than 600mm, and the distance along the long direction of the bottom plate is not more than 1200 mm.
4. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: and a connecting steel plate is welded on the lower chord of the steel bar truss and is connected with the embedded threaded sleeve on the upper surface of the square frustum pyramid through a bolt.
5. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: and connecting steel bars with the spacing not more than 450mm are welded on the lower chord of the steel bar truss and anchored into the prefabricated bottom plate.
6. The utility model provides a detachable formula steel bar truss superimposed sheet that holds on top, its characterized in that: after the prefabricated bottom plate is installed in place on a construction site, the central line of the horizontal support at the bottom of the prefabricated bottom plate coincides with the central line of the square frustum pyramid, the horizontal support is perpendicular to the arrangement of the steel bar truss, and the horizontal distance is not more than 1200 mm.
7. A detachable deck type steel bar truss composite slab is characterized in that after post-cast concrete on a prefabricated bottom plate reaches the designed strength, connecting steel bars are cut off, and then a steel bar truss is detached for the next turnover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969434.8A CN112031236A (en) | 2020-09-16 | 2020-09-16 | Detachable upper-bearing type steel bar truss laminated slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969434.8A CN112031236A (en) | 2020-09-16 | 2020-09-16 | Detachable upper-bearing type steel bar truss laminated slab |
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| Publication Number | Publication Date |
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| CN112031236A true CN112031236A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010969434.8A Withdrawn CN112031236A (en) | 2020-09-16 | 2020-09-16 | Detachable upper-bearing type steel bar truss laminated slab |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250360A (en) * | 2021-07-14 | 2021-08-13 | 南通汉腾建筑科技有限公司 | Assembled precast concrete floor slab and production method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108999326A (en) * | 2018-08-30 | 2018-12-14 | 天津大学建筑设计研究院 | Light steel grating concrete folding plate |
| CN208280412U (en) * | 2018-05-17 | 2018-12-25 | 浙江亿洲机械科技有限公司 | A kind of removable truss floor support plate bottom plate |
| CN110241959A (en) * | 2019-06-06 | 2019-09-17 | 中南林业科技大学 | A kind of superimposed sheet and its construction method |
| CN111075062A (en) * | 2018-10-18 | 2020-04-28 | 中清大科技股份有限公司 | Construction method for separating concrete shear wall structure from pipeline in wall |
| CN210636660U (en) * | 2019-08-07 | 2020-05-29 | 杭州嘉奕达实业有限公司 | Bottom die assembly structure based on steel bar truss floor support plate |
-
2020
- 2020-09-16 CN CN202010969434.8A patent/CN112031236A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208280412U (en) * | 2018-05-17 | 2018-12-25 | 浙江亿洲机械科技有限公司 | A kind of removable truss floor support plate bottom plate |
| CN108999326A (en) * | 2018-08-30 | 2018-12-14 | 天津大学建筑设计研究院 | Light steel grating concrete folding plate |
| CN111075062A (en) * | 2018-10-18 | 2020-04-28 | 中清大科技股份有限公司 | Construction method for separating concrete shear wall structure from pipeline in wall |
| CN110241959A (en) * | 2019-06-06 | 2019-09-17 | 中南林业科技大学 | A kind of superimposed sheet and its construction method |
| CN210636660U (en) * | 2019-08-07 | 2020-05-29 | 杭州嘉奕达实业有限公司 | Bottom die assembly structure based on steel bar truss floor support plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250360A (en) * | 2021-07-14 | 2021-08-13 | 南通汉腾建筑科技有限公司 | Assembled precast concrete floor slab and production method thereof |
| CN113250360B (en) * | 2021-07-14 | 2021-12-10 | 南通汉腾建筑科技有限公司 | Assembled precast concrete floor slab and production method thereof |
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Application publication date: 20201204 |
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