CN112282164B - Light composite floor slab structure and construction method thereof - Google Patents

Light composite floor slab structure and construction method thereof Download PDF

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Publication number
CN112282164B
CN112282164B CN202011149632.6A CN202011149632A CN112282164B CN 112282164 B CN112282164 B CN 112282164B CN 202011149632 A CN202011149632 A CN 202011149632A CN 112282164 B CN112282164 B CN 112282164B
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ribs
pyramid
steel bar
parallel
floor slab
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CN112282164A (en
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李成瑶
彭君秀
喻川
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JIANGXI ZHAO HUI URBAN CONSTRUCTION CO.,LTD.
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Jiangxi Zhao Hui Urban Construction Co ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17Floor structures partly formed in situ
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work

Abstract

A light composite floor slab structure and a construction method thereof belong to the technical field of constructional engineering, and the light composite floor slab structure comprises a prefabricated floor slab and a cast-in-place floor slab, wherein the prefabricated floor slab comprises a main steel bar truss, a concrete bottom plate and a light aggregate core plate; the main steel bar truss is composed of a pyramid truss and longitudinal and transverse ribs, the pyramid truss is composed of a pyramid frame and bottom transverse ribs, and the pyramid frame is composed of parallel opposite fork frame bottoms and oblique ribs; pouring concrete mortar at the bottom of the main steel bar truss to obtain a concrete bottom plate, and pouring light aggregate in the middle of the main steel bar truss to obtain a light aggregate core plate; the cast-in-place floor slab comprises auxiliary steel bar trusses and a concrete panel; binding upper transverse bars and upper longitudinal bars on the top points of the pyramid frame to obtain auxiliary steel bar trusses, pouring concrete mortar on the auxiliary steel bar trusses to obtain concrete panels, and forming the light composite floor slab integrally; the cast-in-place formwork has the beneficial effects of firm structure, strong splicing property, light weight and no need of formwork erection by a bottom formwork during cast-in-place.

Description

Light composite floor slab structure and construction method thereof
Technical Field
The invention belongs to the technical field of building engineering, and particularly relates to a light composite floor slab structure and a construction method thereof.
Background
Floor slabs are a kind of divided load-bearing member. The bearing part in the floor layer divides the house into a plurality of layers in the vertical direction, and transmits the vertical load of people, furniture and the like and the self weight of the floor to the foundation through the wall body, the beam or the column, thereby playing the role of transmitting the vertical load. At present, the most common floor in practical engineering is a reinforced concrete floor, and can be divided into a cast-in-place reinforced concrete floor and an assembly reinforced concrete floor according to a construction method.
The cast-in-place reinforced concrete floor slab is generally a solid slab, is usually cast together with a cast-in-place beam to form a cast-in-place beam slab, has good integrity, durability and shock resistance and high rigidity, can adapt to building planes of various shapes, and is convenient for reserving holes or arranging embedded parts on equipment. But the method has the defects of large template consumption, long construction period and the like.
By adopting the reinforced concrete floor structure, the factory prefabricated standard floor is transported to the site for hoisting and splicing, so that the site wet operation and the formwork supporting workload can be reduced, and the construction period is greatly shortened. However, the existing fabricated composite floor slab often has the defects of poor durability, poor shock resistance and insufficient overall connection strength; for single-slab prefabrication, the floor slabs assembled on site are mainly stressed by the single-slab, and the prefabricated floor slabs are not mutually connected, so that the integrity cannot be ensured; after the prefabricated floors are spliced on site, steel bar lapping and post-pouring belts are needed, and on-site formwork erecting and lap belt pouring are still needed to influence the construction efficiency; in order to overcome the defects of cast-in-place floor slabs and prefabricated floor slabs, the laminated floor slabs are natural; the precast concrete layer of the existing laminated floor slab is thick, so that the hoisting precision is greatly influenced by the hoisting weight, meanwhile, the cast-in-place layer is thinned to be unfavorable for laying of the pre-buried pipeline, and finally, the thickness of the whole floor slab is large.
In order to overcome the defects of the traditional laminated floor slab, the structure and the construction process of the laminated floor slab are improved and innovated by people. For example, patent document CN 108360721B discloses a precast concrete ultra-thin type two-way force-bearing fabricated steel bar truss composite floor slab, which comprises basic components including section steel beams, a three-dimensional truss temporary support, a connecting plate, a triangular steel bar truss, precast short bars and precast concrete slabs. Wherein: the section steel beam is welded with the connecting plate, and the prefabricated short rib, the steel bar truss and the prefabricated floor slab are poured into a whole. And hoisting the beam, the temporary support and the precast concrete floor in place and connecting the beam, the temporary support and the precast concrete floor by bolts on site, and paving the through reinforcing steel bars to pour the residual concrete. The prefabricated concrete ultra-thin assembled type steel bar truss composite floor slab with the temporary supports is adopted, the floor slab integrity problem is solved, the floor slab reliability in the construction stage is guaranteed, meanwhile, a post-cast strip of the assembled type floor slab is avoided, the field work efficiency is improved, the thickness of the prefabricated concrete slab is reduced, the hoisting weight is reduced, and the assembling precision is improved. However, the scheme still has three defects that 1, the precast concrete plates are directly spliced, and the connectivity is not strong; 2, the precast concrete slab is too heavy and inconvenient to construct; 3 still need adopt interim support, do not effectively reduce work load.
Disclosure of Invention
The invention aims to solve the technical problem of providing a composite floor slab which has firm structure, strong splicing property, light weight and convenient installation without a support frame.
In order to solve the technical problem, the technical scheme adopted by the invention is a light composite floor slab structure and a construction method thereof, and the light composite floor slab structure is characterized by comprising a prefabricated floor slab and a cast-in-place floor slab, wherein the prefabricated floor slab is produced in a factory, and the cast-in-place floor slab is cast in place on a building; the prefabricated floor slab comprises a main steel bar truss, a concrete bottom plate wrapping the bottom of the main steel bar truss and a light aggregate core plate wrapping the middle of the main steel bar truss; the main steel bar truss comprises bottom longitudinal bars, bottom transverse bars, inner longitudinal bars, inner transverse bars and a pyramid truss, the pyramid truss comprises bottom transverse bars and a pyramid frame, the pyramid frame comprises a parallel pair of fork frame bottoms and four equilong oblique bars, the parallel pair of fork frame bottoms comprise two equilong parallel bars and two equilong crossed bars, the two equilong crossed bars are mutually and crossly welded from the middle part, and then the two equilong parallel bars are respectively welded on the end points of the two equilong crossed bars to form a parallel pair of fork frame bottoms; one ends of four equal-length inclined ribs are fixedly connected to four end points of the parallel fork frame bottoms, and the other ends of the four equal-length inclined ribs are fixedly connected together to form the same vertex, namely the pyramid vertex, so that a pyramid is formed; binding two parallel ribs in the parallel pair of the fork frame bottoms of the pyramid frames to the two bottom transverse ribs respectively, and thus binding the two parallel ribs in the parallel pair of the fork frame bottoms of a plurality of pyramid frames to the same two bottom transverse ribs in a staggered manner in sequence to form a pyramid truss; binding a plurality of pyramid trusses on a plurality of bottom longitudinal ribs side by side, wherein the plurality of bottom longitudinal ribs and the bottom transverse ribs form a bottom rib plane; when the fork frame bottoms of the parallel pairs of the pyramid frames are sequentially and alternately bound, the inclined ribs on two adjacent pyramid frames are intersected with each other, a plurality of inner longitudinal ribs and inner transverse ribs are bound on the inclined ribs at the intersection of the inclined ribs, and a plurality of inner longitudinal ribs and inner transverse ribs jointly form an inner rib plane; together forming a main steel bar truss.
The concrete bottom plate for coating the bottom of the main steel bar truss is formed by erecting a pouring template for the main steel bar truss in a prefabrication factory, laying and binding a steel wire mesh between a bottom rib plane and an inner rib plane, then pouring common concrete mortar, coating the bottom rib plane, the inner rib plane, the steel wire mesh and oblique ribs on a pyramid frame positioned between the bottom rib plane and the inner rib plane, and forming the concrete bottom plate for coating the bottom of the main steel bar truss after curing and forming. Because the concrete bottom plate coats the bottom of the pyramid and the two layers of steel bar planes, the concrete bottom plate has extremely high strength and can bear strong pressure.
Furthermore, the two side surfaces of the concrete bottom plates are made into step-shaped occlusion structures, wherein one side of the concrete bottom plates is made into a platform edge structure, the other side of the concrete bottom plates is made into an eaves shielding structure, and the platform edge structure on one concrete bottom plate is mutually occluded with the eaves shielding structure on the other concrete bottom plate during installation.
Furthermore, the side surface coating of platform edge structure and eaves structure has sealed glue, like this, after the interlock, just need not be in the below formwork again when carrying out the post-cast strip, and direct pouring can not leak thick liquid.
The light aggregate core plate for coating the middle part of the main steel bar truss is formed by erecting a pouring template aiming at the middle part of the main steel bar truss in a prefabrication factory, taking a concrete bottom plate as a bottom plate of the pouring template, then pouring light aggregate above the concrete bottom plate, coating the middle oblique rib of the pyramid, exposing the top point of the pyramid, and forming the light aggregate core plate for coating the middle part of the main steel bar truss after curing and forming.
The main steel bar truss, the concrete bottom plate and the light aggregate core plate jointly form a prefabricated floor slab.
The cast-in-place floor slab comprises an auxiliary steel bar truss and a concrete panel wrapping the auxiliary steel bar truss, wherein the auxiliary steel bar truss comprises upper longitudinal bars and upper transverse bars, and a plurality of upper longitudinal bars and a plurality of upper transverse bars are bound on the top of a pyramid above the prefabricated floor slab to form the auxiliary steel bar truss; at the moment, the upper longitudinal bars can be directly connected with the pyramid vertexes of two adjacent prefabricated floor slabs to form the steel bar truss of the integral laminated floor slab with stable structure.
The concrete panel for coating the auxiliary steel bar truss is formed by erecting a pouring template on the auxiliary steel bar truss on a building site, laying and binding a steel bar net on the auxiliary steel bar truss by taking a prefabricated floor slab as a bottom plate of the pouring template, then pouring common concrete mortar, completely coating an upper transverse bar, an upper longitudinal bar and a steel wire net, and forming the concrete panel for coating the auxiliary steel bar truss after curing and forming. Thus, a support frame for supporting the casting form is no longer required at the construction site.
And the auxiliary steel bar truss and the concrete panel jointly form a cast-in-place floor slab.
A construction method of a light composite floor slab structure comprises the following steps:
the method comprises the steps of manufacturing a pyramid frame, cutting two parallel ribs with equal length and two crossed ribs with equal length by using a steel bar material, fixing the two crossed ribs with equal length in a crossed mode from the middle, and welding the two parallel ribs with equal length on end points of the two crossed ribs with equal length in a parallel mode respectively to form a parallel fork frame pair bottom; cutting four diagonal bars with equal length by using a reinforcing steel bar material, welding one ends of the four diagonal bars with equal length on four end points of the parallel opposite fork frame bottom, welding the other ends of the four diagonal bars with equal length together to form a pyramid vertex, and forming a pyramid frame by using two parallel bars with equal length, two crossed bars with equal length and the four diagonal bars with equal length together; thus, a plurality of pyramids are manufactured.
Cutting a plurality of bottom transverse ribs, bottom longitudinal ribs, inner transverse ribs, inner longitudinal ribs, upper transverse ribs and upper longitudinal ribs by using a reinforcing steel bar material; preparing a plurality of binding steel wires and a plurality of reinforcing meshes.
Manufacturing a pyramid truss, respectively binding two parallel ribs in the bottom of a parallel pair of the pyramid frames to two bottom transverse ribs which are arranged in parallel, then respectively binding two parallel ribs in the bottom of the parallel pair of the pyramid frames to the same two bottom transverse ribs which are arranged in parallel, and placing the parallel ribs on the two pyramid frames in a staggered mode during binding, so that the parallel ribs on the two pyramid frames are partially overlapped, the overlapped part of the parallel ribs is 5% -40% of the length of the parallel ribs, and is preferably 20% of the length of the parallel ribs, and thus, the two parallel ribs in the bottom of the parallel pair of the pyramid frames of a plurality of pyramid frames are sequentially bound to the same two bottom transverse ribs in a staggered mode to form the pyramid truss.
Preparing a main steel bar truss, tying a plurality of pyramid trusses to a plurality of bottom longitudinal ribs side by side, wherein the distance between every two pyramid trusses is larger than or equal to zero and smaller than or equal to the width of the pyramid trusses, and the bottom longitudinal ribs and the bottom transverse ribs form a bottom rib plane; when the fork frame bottoms of the parallel pairs of the pyramid frames are sequentially and alternately bound, the inclined ribs on two adjacent pyramid frames are intersected with each other, a plurality of inner longitudinal ribs and inner transverse ribs are bound on the inclined ribs at the intersection of the inclined ribs, and a plurality of inner longitudinal ribs and inner transverse ribs jointly form an inner rib plane; thus, the bottom rib plane, the inner rib plane and the pyramid truss jointly form a main steel bar truss.
Fifthly, manufacturing the concrete bottom plate, in a prefabrication factory, firstly, erecting a formwork, erecting a bottom formwork and side formworks, placing a main steel bar truss in the formwork, laying and binding a steel wire mesh between a bottom rib plane and an inner rib plane, or laying a plurality of steel wire meshes above or below the bottom rib plane and the inner rib plane, then pouring concrete mortar, covering and burying the bottom rib plane, the inner rib plane and the steel wire mesh as well as the oblique ribs and the oblique ribs on the pyramid frame positioned between the bottom rib plane and the inner rib plane in parallel to the bottom cover of the fork frame, and forming the concrete bottom plate covering the bottom of the main steel bar truss after curing and forming. The concrete mortar is common concrete mortar.
Sixthly, manufacturing a light aggregate core plate, in a prefabrication factory, firstly, supporting a mold, erecting a side mold plate by taking a concrete bottom plate as a bottom mold plate, then pouring light aggregate above the concrete bottom plate, coating the middle oblique ribs of the pyramid, reserving the vertex of the pyramid, and forming the light aggregate core plate coated on the middle part of the main steel bar truss after curing and forming.
The main steel bar trusses, the concrete bottom plate and the light aggregate core plate jointly form a prefabricated floor slab, and most steel bars in the main steel bar trusses are covered in the concrete bottom plate of the prefabricated floor slab and can bear most of load; meanwhile, the light aggregate core plates occupy most of the prefabricated floor slab, so that the prefabricated floor slab is relatively light and convenient to carry and install, and meanwhile, the pyramid tops are exposed outside and can be used as hoisting force points during carrying and installing without being hoisted by additional pull ropes, and the prefabricated floor slab can be prevented from being damaged.
The length and the width of the prefabricated floor slab can preferably directly cover the cross beams and the longitudinal beams of the floor, but the length and the width of the actual floor are larger than 3 meters, and the large prefabricated floor slab cannot be transported, so the prefabricated floor slab manufactured by the method is generally larger than the distance between the cross beams of the floor in the length direction, is 6 meters at the longest, is generally smaller than the distance between the longitudinal beams in the width direction, is generally 1.5 meters, and is 2 meters at the maximum, and splicing is needed in a construction site.
And then, carrying the prefabricated floor slab to a construction site and continuing construction.
And manufacturing a secondary steel bar truss, assembling the prefabricated floor slabs on the building beam, binding the transverse ribs and the upper longitudinal ribs on the top point of the pyramid, and directly binding the upper longitudinal ribs and the pyramid top points on two adjacent prefabricated floor slabs so that the upper transverse ribs, the upper longitudinal ribs and the pyramid top points form the secondary steel bar truss together.
And manufacturing a concrete panel, in a construction site, firstly, erecting a formwork, taking the prefabricated floor slabs as bottom formworks, then erecting side formworks, containing gaps between two adjacent prefabricated floor slabs in the formworks, laying and binding reinforcing mesh on the upper transverse ribs and the upper longitudinal ribs, then pouring concrete mortar, completely coating and burying the upper transverse ribs, the upper longitudinal ribs and the reinforcing mesh, and forming the concrete panel coated with the auxiliary steel bar trusses after curing and forming to obtain the cast-in-place floor slab, thereby integrally forming the light laminated floor slab.
Fifthly, binding a square strip mold on the lower side of the side template on one side and binding a square strip mold on the upper side of the side template on the opposite side when the side templates are additionally arranged, so that after casting and maintenance are completed, the side surface of the concrete bottom plate can form a stepped occlusion structure, wherein one side is a platform edge structure, and the other side is an eave shielding structure; and then in the fifth step, after the prefabricated floor slabs are assembled on the building beam, the platform edge structures on two adjacent prefabricated floor slabs are mutually occluded with the eaves structure, sealant is coated to adhere the occluded surfaces, and then the transverse ribs and the upper longitudinal ribs are bound on the peaks of the pyramid.
Compared with the prior art, the invention has the following beneficial effects:
the composite floor slab is divided into a prefabricated floor slab and a cast-in-place floor slab, particularly, a steel bar truss is divided into a main steel bar truss and an auxiliary steel bar truss, the main steel bar truss is bound in a factory and is combined with a concrete bottom plate and a light aggregate core plate to form the prefabricated floor slab, the exposed pyramid vertex of the main steel bar truss is a part of the truss and is a carrying force application point, meanwhile, the carrying weight of the prefabricated floor slab can be reduced, and the composite floor slab is convenient to mount.
The parallel fork butt frame bottom is formed by welding two equilong parallel ribs and two equilong crossed ribs, and actually, the bottom of the pyramid frame is made into a structure with four vertexes of a square formed by two symmetrical triangles.
And thirdly, the pyramid frame is formed by parallel opposite fork frame bottoms and four equal-length inclined ribs, actually four triangles are formed above the frame bottoms, two triangles are crossed with each other and correspond to each other, and the stable pyramid frame is formed by combining the parallel opposite fork frame bottoms.
The pyramid trusses are sequentially and crossly tied to the bottom transverse ribs, so that the strength of the bottom transverse ribs can be improved, the crossed oblique ribs can be formed, the oblique ribs are tied at the crossed positions, the strength of the oblique ribs can be greatly improved, and the strength and the stability of the trusses can be greatly improved due to the pyramid trusses formed by the plurality of pyramid trusses.
The pyramid truss is combined with the bottom longitudinal ribs, the inner transverse ribs and the inner longitudinal ribs to form the main steel bar truss, so that the main steel bar truss can be firmly supported front, back, left, right, upper and lower.
Sixthly, making the bottom of the main steel bar truss into a concrete bottom plate, and enabling the concrete bottom plate to cover the bottom of the pyramid, the lower parts of the crossed oblique ribs, the bottom rib plane and the inner rib plane, wherein the concrete bottom plate has extremely high strength and can bear strong load pressure.
And the middle part of the main steel bar truss is made into a light aggregate core plate, so that the overall quality of the composite floor slab can be greatly reduced, the composite floor slab is convenient to carry and install, and the composite floor slab has a heat insulation effect.
The engaging structures are arranged on the two sides of the width direction of the prefabricated floor slab, so that the floor slab can be tightly jointed after being spliced, the prefabricated floor slab can be conveniently used as a bottom template of a cast-in-place floor slab, a bottom template is not required to be erected, and labor force can be greatly saved; the length direction need not to set up the interlock structure because length direction's precast floor slab both ends can be shelved on the roof beam, and the post-cast strip on the roof beam can use the roof beam as the die block board, also need not the formwork.
The self-supporting provides a light composite floor slab which has firm structure, strong splicing property, light weight and no need of bottom template formwork and is convenient to install on the whole.
Drawings
Fig. 1 is a schematic structural view of a main steel bar truss according to the present invention.
Fig. 2 is a schematic view of the assembly process and structure of the pyramid truss of the present invention.
FIG. 3 is a schematic view of the assembly process and structure of the pyramid frame of the present invention.
FIG. 4 is a schematic view of the assembly process and structure of the parallel fork bottom of the present invention.
Fig. 5 is a schematic structural view illustrating a concrete bottom slab poured on the main steel bar truss according to the present invention.
Fig. 6 is a schematic view showing the overall structure of the prefabricated floor slab consisting of the main steel bar trusses, the concrete bottom plate and the lightweight aggregate core plate according to the present invention.
Fig. 7 is a schematic view of the process and structure of splicing the precast floor slabs at a construction site according to the present invention.
Fig. 8 is a schematic structural view illustrating the construction of the present invention in which the sub-steel trusses are attached and a part of the concrete panel is poured after the prefabricated floor slab is spliced at a construction site.
Fig. 9 is a schematic cross-sectional view of the frame a in fig. 7, i.e. a cross-sectional view along the length direction.
Fig. 10 is a schematic view of the cross-sectional structure at the position of the frame B in fig. 7 and the position of the frame C in fig. 8, i.e., a cross-sectional view in the width direction.
In the figure: 1. the concrete structure comprises a bottom transverse rib, 2 bottom longitudinal ribs, 3 inner transverse ribs, 4 inner longitudinal ribs, 5 upper transverse ribs, 6 upper longitudinal ribs, 7 pyramid frames, 8 parallel ribs, 9 cross ribs, 10 parallel opposite fork frame bottoms, 11 oblique ribs, 12 pyramid vertexes, 13 pyramid trusses, 14 bottom rib planes, 15 inner rib planes, 16 main steel bar trusses, 17 table edge structures, 18 eave shielding structures, 19 sealant, 20 concrete bottom plates, 21 light aggregate core plates, 22 auxiliary steel bar trusses and 23 concrete panels.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to illustrate the invention but not to limit it further, and should not be construed as limiting the scope of the invention.
Example 1.
As shown in the figure, the light composite floor slab structure and the construction method thereof comprise the following steps:
preparing steel bar strips, steel wires and steel bar nets; the reinforcing steel bar is cut into a plurality of bottom transverse bars 1, bottom longitudinal bars 2, inner transverse bars 3, inner longitudinal bars 4, upper transverse bars 5 and upper longitudinal bars 6.
Manufacturing a pyramid frame 7, cutting a reinforcing bar into two parallel ribs 8 with equal length and two crossed ribs 9 with equal length, welding and fixing the two crossed ribs 9 with equal length in a cross mode from the middle, and then welding the two parallel ribs 8 with equal length on the end points of the two crossed ribs 9 with equal length in a parallel mode to form a parallel opposite fork frame bottom 10; in addition, four diagonal ribs 11 with equal length are cut from the reinforcing bar, one ends of the four diagonal ribs 11 with equal length are welded on four end points of the parallel fork frame base 10, and the other ends are welded together to form a pyramid vertex 12, so that two parallel ribs 8 with equal length, two crossed ribs 9 with equal length and the four diagonal ribs 11 with equal length are welded together to form a pyramid frame 7; thus, a plurality of pyramids 7 are produced.
Manufacturing a pyramid truss 13, binding two parallel ribs 8 in the parallel pair fork frame bottom 10 of the pyramid frame 7 to two parallel bottom transverse ribs 1 respectively by using steel wires, then binding two parallel ribs 8 in the parallel pair fork frame bottom 10 of the other pyramid frame 7 to the same two parallel bottom transverse ribs 1 respectively, placing the parallel ribs 8 on the two pyramid frames 7 in a staggered mode during binding, enabling the parallel ribs 8 on the two pyramid frames 7 to be partially overlapped, overlapping 20% of the length of the parallel ribs 8, sequentially binding the two parallel ribs 8 in the parallel pair fork frame bottom 10 of the plurality of pyramid frames 7 to the same two bottom transverse ribs 1 in a staggered and overlapped mode, and manufacturing the pyramid truss 13.
Fourthly, a main steel bar truss 16 is manufactured, a plurality of pyramid trusses 13 are tied to the bottom longitudinal ribs 2 side by side, the distance between every two pyramid trusses 13 is larger than or equal to zero and smaller than or equal to the width of the pyramid 7, and the distance between every two pyramid trusses 13 is made to be equal to half of the length of the parallel ribs 8; a plurality of bottom longitudinal ribs 2 and bottom transverse ribs 1 positioned at the bottom of the pyramid frame 7 form a bottom rib plane 14; when the fork frame bases 10 of the pyramid frames 7 are sequentially and alternately bound, the diagonal ribs 11 on two adjacent pyramid frames 7 are crossed with each other, a plurality of inner longitudinal ribs 4 and inner transverse ribs 3 are bound on the diagonal ribs 11 at the crossed positions, and the plurality of inner longitudinal ribs 4 and the inner transverse ribs 3 jointly form an inner rib plane 15; thus, the bottom rib plane 14, the inner rib plane 15 and the pyramid truss 13 together form a main steel truss 16.
Fifthly, manufacturing the concrete bottom plate 20, in a prefabrication factory, firstly, erecting a formwork, erecting a bottom formwork and a side formwork, binding a square strip formwork on the lower side of the side formwork on one side in the width direction, and binding a square strip formwork on the upper side of the side formwork on the opposite side; then, the main steel bar truss 16 is placed in the template, a steel wire mesh is laid and bound between the bottom rib plane 14 and the inner rib plane 15, a plurality of steel wire meshes can also be laid above or below the bottom rib plane 14 and the inner rib plane 15, then concrete mortar is poured, the bottom rib plane 14, the inner rib plane 15, the steel wire mesh, the inclined ribs 11 on the pyramid frame 7 located between the bottom rib plane 14 and the inner rib plane 15 and the parallel fork frame bottom 10 are covered and buried, and after maintenance and molding, the concrete bottom plate 20 covering the bottom of the main steel bar truss 16 is formed. After the formwork is removed, a stepped occlusion structure appears on the side surface of the concrete bottom plate 20, wherein one side is a platform edge structure 17, and the other side is an eave shielding structure 18; additionally, the side surfaces of the platform edge structure 17 and the eave structure 18 are coated with sealant 19 for bonding during splicing; the concrete mortar is common concrete mortar, and the concrete mortar in the embodiment is formed by mixing cement, sand and water.
Sixthly, manufacturing a light aggregate core plate 21, in a prefabrication factory, firstly, supporting a mold, erecting a side mold plate by taking the concrete bottom plate 20 as a bottom mold plate, then pouring light aggregate above the concrete bottom plate 20, enabling the light aggregate to coat the middle inclined ribs 11 of the pyramid 7, only reserving the vertexes 12 of the pyramid, and forming the light aggregate core plate 21 coating the middle part of the main steel bar truss 16 after curing and forming. The lightweight aggregate is a material with density far less than that of concrete mortar, and the lightweight aggregate adopted in the embodiment is formed by mixing cement, EPS particles, perlite and water. Thus, the main steel bar trusses 16, the concrete bottom slab 20 and the lightweight aggregate core slab 21 together form a prefabricated floor slab. In this embodiment, the length of the precast floor slab is 4500mm, the width is 1500mm, the thickness of the concrete bottom plate 20 is 50mm, the thickness of the light aggregate core plate 21 is 100mm, the height of the main steel bar truss 16 is 180mm, and the height of the pyramid apex 12 exposed outside the light aggregate core plate 21 is 40 mm.
And (3) carrying the prefabricated floor slab to a construction site, and then continuing construction, wherein a lifting rope can be hung on the pyramid vertexes 12 or on a plurality of pyramid vertexes 12 during lifting so as to keep the prefabricated floor slab in a horizontal state.
Manufacturing a secondary steel bar truss 22, assembling prefabricated floor slabs on a building beam, mutually meshing the platform edge structures 17 on two adjacent prefabricated floor slabs and the eave structures 18, adhering the sealants 19, firmly adhering the meshed surfaces, then binding the upper transverse ribs 5 and the upper longitudinal ribs 6 on the pyramid vertexes 12, and directly binding the upper longitudinal ribs 6 and the pyramid vertexes 12 on the two adjacent prefabricated floor slabs so as to enable the upper transverse ribs 5, the upper longitudinal ribs 6 and the pyramid vertexes 12 to jointly form the secondary steel bar truss 22.
And then, manufacturing a concrete panel 23, in a construction site, firstly, erecting a formwork, taking the prefabricated floor slabs as bottom formworks, then erecting side formworks, including gaps between two adjacent prefabricated floor slabs in the formworks, then laying and binding reinforcing mesh on the upper transverse ribs 5 and the upper longitudinal ribs 6, then pouring concrete mortar, completely covering and burying the upper transverse ribs 5, the upper longitudinal ribs 6 and the reinforcing mesh, and forming the concrete panel 23 covering the auxiliary steel bar truss 22 after curing and forming to obtain the cast-in-place floor slab, thereby integrally forming the light laminated floor slab. In the present embodiment, the height of the sub-steel trusses 22 including the pyramid apexes 12 is set to 40mm, and the height of the concrete face 23 is set to 50 mm.
Thus, the concrete bottom plate 20, the lightweight aggregate core plate 21, the concrete face plate 23, and the main and sub steel trusses 16 and 22 together constitute a lightweight composite floor slab.
Example 2.
On the basis of the embodiment 1, the parallel ribs 8 on the two pyramid towers 7 are staggered, so that 15% of the length of the parallel ribs 8 on the two pyramid towers 7 are overlapped, then the length of the prefabricated floor slab is 4500mm, the width of the prefabricated floor slab is 1500mm, the thickness of the concrete bottom plate 20 is 40mm, the thickness of the light aggregate core plate 21 is 130mm, the height of the main steel bar truss 16 is 180mm, and the height of the vertex 12 of the pyramid tower exposed outside the light aggregate core plate 21 is 20 mm; the height of the sub-steel trusses 16 including the pyramid apexes 12 is set to 20mm, and the height of the concrete face 23 is set to 30 mm. Therefore, the whole weight of the composite floor slab can be reduced under the condition of ensuring the strength of the composite floor slab.
Example 3.
On the basis of the embodiment 1, the parallel ribs 8 on the two pyramid towers 7 are staggered, so that 25% of the length of the parallel ribs 8 on the two pyramid towers 7 are overlapped, then the length of the prefabricated floor slab is 4500mm, the width of the prefabricated floor slab is 1500mm, the thickness of the concrete bottom plate 20 is 60mm, the thickness of the light aggregate core plate 21 is 90mm, the height of the main steel bar truss 16 is 180mm, and the height of the vertex 12 of the pyramid tower exposed outside the light aggregate core plate 21 is 40 mm; the height of the sub-steel trusses 22 including the pyramid apexes 12 is set to 40mm, and the height of the concrete face 23 is set to 50 mm. Therefore, the load strength of the composite floor slab can be improved under the condition of ensuring that the whole weight of the composite floor slab is reduced.

Claims (10)

1. A light composite floor slab structure is characterized in that the light composite floor slab structure comprises a prefabricated floor slab and a cast-in-place floor slab, the prefabricated floor slab comprises a main steel bar truss and a prefabricated slab wrapping the main steel bar truss, the main steel bar truss comprises a bottom longitudinal bar, a bottom transverse bar, an inner longitudinal bar, an inner transverse bar and a pyramid truss, the pyramid truss comprises a bottom transverse bar and a pyramid frame, the pyramid frame comprises a parallel opposite fork frame bottom and four equilong oblique bars, the parallel opposite fork frame bottom comprises two equilong parallel bars and two equilong crossed bars, the two equilong crossed bars are mutually and crossly welded from the middle part, and the two equilong parallel bars are respectively welded on the end points of the two equilong parallel bars to form a parallel opposite fork frame bottom; one ends of four equal-length inclined ribs are fixedly connected to four end points of the parallel fork frame bottoms, and the other ends of the four equal-length inclined ribs are fixedly connected together to form the same vertex, namely the pyramid vertex, so that a pyramid is formed; binding two parallel ribs in the parallel pair of the fork frame bottoms of the pyramid frames to the two bottom transverse ribs respectively, and thus binding the two parallel ribs in the parallel pair of the fork frame bottoms of a plurality of pyramid frames to the same two bottom transverse ribs in a staggered manner in sequence to form a pyramid truss; binding a plurality of pyramid trusses on a plurality of bottom longitudinal ribs side by side, wherein the plurality of bottom longitudinal ribs and the bottom transverse ribs form a bottom rib plane; when the fork frame bottoms of the parallel pairs of the pyramid frames are sequentially and alternately bound, the inclined ribs on two adjacent pyramid frames are intersected with each other, a plurality of inner longitudinal ribs and inner transverse ribs are bound on the inclined ribs at the intersection of the inclined ribs, and a plurality of inner longitudinal ribs and inner transverse ribs jointly form an inner rib plane; together forming a main steel bar truss.
2. The lightweight composite floor structure according to claim 1, wherein said precast slab covering the main steel bar truss comprises a concrete bottom slab covering the bottom of the main steel bar truss and a lightweight aggregate core slab covering the middle of the main steel bar truss; the concrete bottom plate for coating the bottom of the main steel bar truss is formed by laying and binding a steel wire mesh between a bottom rib plane and an inner rib plane, then pouring concrete mortar, coating the bottom rib plane, the inner rib plane, the steel wire mesh and an oblique rib on the pyramid frame between the bottom rib plane and the inner rib plane, and forming the concrete bottom plate for coating the bottom of the main steel bar truss after curing and forming.
3. The lightweight composite floor slab structure according to claim 2, wherein both side surfaces of said concrete bottom slab are made into a step-like engagement structure, wherein one side is made into a ledge structure and the other side is made into a eaves structure.
4. A lightweight composite floor structure according to claim 3, wherein the platform edge structures and the lateral surfaces of the eave structure are coated with a sealant.
5. The lightweight composite floor slab structure according to claim 3 or 4, wherein the lightweight aggregate core plate covering the middle part of the main steel bar truss is formed by pouring lightweight aggregate above the concrete bottom plate, covering the middle oblique ribs of the pyramid frame to leave the vertexes of the pyramid, and curing and forming the lightweight aggregate core plate covering the middle part of the main steel bar truss.
6. The lightweight composite floor slab structure according to claim 5, wherein said cast-in-place floor slab includes a secondary steel bar truss and a concrete panel covering said secondary steel bar truss, said secondary steel bar truss includes upper longitudinal bars and upper transverse bars, and a plurality of upper longitudinal bars and a plurality of upper transverse bars are bound on the pyramid vertexes above said prefabricated floor slab to form the secondary steel bar truss.
7. The lightweight composite floor slab structure according to claim 6, wherein the concrete panel covering the secondary steel bar trusses is a bottom slab using a prefabricated floor slab as a casting form, a steel bar net is laid and bound on the secondary steel bar trusses, then a common concrete mortar is cast, the upper transverse bars, the upper longitudinal bars and the steel wire net are completely covered, and after curing and forming, the concrete panel covering the secondary steel bar trusses is formed.
8. The lightweight composite floor structure according to claim 7, comprising the following construction steps:
the method comprises the steps of manufacturing a pyramid frame, cutting two parallel ribs with equal length and two crossed ribs with equal length by using a steel bar material, fixing the two crossed ribs with equal length in a crossed mode from the middle, and welding the two parallel ribs with equal length on end points of the two crossed ribs with equal length in a parallel mode respectively to form a parallel fork frame pair bottom; cutting four diagonal bars with equal length by using a reinforcing steel bar material, welding one ends of the four diagonal bars with equal length on four end points of the parallel opposite fork frame bottom, welding the other ends of the four diagonal bars with equal length together to form a pyramid vertex, and forming a pyramid frame by using two parallel bars with equal length, two crossed bars with equal length and the four diagonal bars with equal length together; thus manufacturing a plurality of pyramid frames;
cutting a plurality of bottom transverse ribs, bottom longitudinal ribs, inner transverse ribs, inner longitudinal ribs, upper transverse ribs and upper longitudinal ribs by using a reinforcing steel bar material;
manufacturing a pyramid truss, respectively binding two parallel ribs in the bottom of a parallel pair of the pyramid frames to two bottom transverse ribs which are arranged in parallel, then respectively binding two parallel ribs in the bottom of a parallel pair of the other pyramid frame to the same two bottom transverse ribs which are arranged in parallel, and placing the parallel ribs on the two pyramid frames in a staggered mode during binding, so that the parallel ribs on the two pyramid frames are partially overlapped, and thus, two parallel ribs in the bottom of the parallel pair of the pyramid frames of a plurality of pyramid frames are sequentially bound to the same two bottom transverse ribs in a staggered mode to form the pyramid truss;
preparing a main steel bar truss, tying a plurality of pyramid trusses to a plurality of bottom longitudinal ribs side by side, and enabling the plurality of bottom longitudinal ribs and the bottom transverse ribs to form a bottom rib plane; when the fork frame bottoms of the parallel pairs of the pyramid frames are sequentially and alternately bound, the inclined ribs on two adjacent pyramid frames are intersected with each other, a plurality of inner longitudinal ribs and inner transverse ribs are bound on the inclined ribs at the intersection of the inclined ribs, and a plurality of inner longitudinal ribs and inner transverse ribs jointly form an inner rib plane; the bottom rib plane, the inner rib plane and the pyramid truss jointly form a main steel bar truss;
fifthly, manufacturing a concrete bottom plate, erecting a bottom template and a side template, placing a main steel bar truss in the template, laying and binding a steel wire mesh between a bottom rib plane and an inner rib plane, then pouring concrete mortar, covering and burying the bottom rib plane, the inner rib plane and the steel wire mesh, as well as an oblique rib and a parallel opposite fork frame on a pyramid frame positioned between the bottom rib plane and the inner rib plane, and forming the concrete bottom plate covering the bottom of the main steel bar truss after curing and forming;
sixthly, manufacturing a light aggregate core plate, erecting a side template by taking a concrete bottom plate as a bottom template, then pouring light aggregate above the concrete bottom plate, coating the inclined ribs in the middle of the pyramid, reserving the vertex of the pyramid, and forming the light aggregate core plate coating the middle of the main steel bar truss after curing and molding;
manufacturing a secondary steel bar truss, assembling prefabricated floor slabs on a building beam, binding transverse ribs and upper longitudinal ribs on the top point of the pyramid, and directly binding the upper longitudinal ribs and pyramid top points on two adjacent prefabricated floor slabs to enable the upper transverse ribs, the upper longitudinal ribs and the pyramid top points to jointly form the secondary steel bar truss;
and manufacturing a concrete panel, taking the prefabricated floor slabs as bottom templates, erecting side templates, containing gaps between two adjacent prefabricated floor slabs in the templates, laying and binding reinforcing mesh on the upper transverse ribs and the upper longitudinal ribs, then pouring concrete mortar, completely covering and burying the upper transverse ribs, the upper longitudinal ribs and the reinforcing mesh, and forming the concrete panel covered with the auxiliary steel bar truss after curing and molding.
9. The lightweight composite floor slab structure according to claim 8, wherein in the step fifthly, when the side formworks are additionally arranged, the square strip molds are bound on the lower sides of the side formworks on one side, and the square strip molds are bound on the upper sides of the side formworks on the opposite side; in the second place, after the prefabricated floor slabs are assembled on the building beam, the platform edge structures on two adjacent prefabricated floor slabs are mutually meshed with the eaves shielding structures, and then the transverse ribs and the upper longitudinal ribs are bound on the top points of the pyramid.
10. The lightweight composite floor slab structure according to claim 9, wherein in the third step, the parallel ribs on the two pyramids are staggered so that the parallel ribs on the two pyramids are partially overlapped, and the overlapped part is 5% -40% of the length of the parallel ribs.
CN202011149632.6A 2020-10-23 2020-10-23 Light composite floor slab structure and construction method thereof Active CN112282164B (en)

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JP2674463B2 (en) * 1993-04-23 1997-11-12 鹿島建設株式会社 Reinforcing bar assembly and method of using the same
KR101718050B1 (en) * 2015-06-02 2017-03-20 이기장 The hollowcore slab type-deck plate structure without anti-floating devices and the construction method thereof
CN106522440A (en) * 2016-11-17 2017-03-22 西咸新区矩阵实业有限公司 Composite floor slab based on polyphenyl granule fiber concrete sandwich insulation and construction method
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