CN216305077U

CN216305077U - Perforated prefabricated bottom plate of laminated floor slab and hoisting structure thereof

Info

Publication number: CN216305077U
Application number: CN202022784479.6U
Authority: CN
Inventors: 邹胜斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-04-15
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a perforated prefabricated bottom plate of a composite floor slab and a hoisting structure thereof, relates to the field of assembly type buildings, and solves the technical problem of providing the prefabricated bottom plate of the composite floor slab convenient to prefabricate and hoist. The technical scheme adopted by the utility model is as follows: the perforated prefabricated bottom plate for the composite floor slab comprises a bottom plate and sleeves, wherein the bottom plate is made of concrete provided with a reinforcing mesh, a plurality of hoisting points are arranged on the bottom plate, through holes are formed in the hoisting points, and the hollow sleeves are arranged in the through holes. The upper portion of hoisting piece sets up and is used for with hoisting device complex lifting eye or rings, and the middle part of hoisting piece is worn to locate in the sleeve, and the size of the lower part of hoisting piece is greater than the size of sleeve lower extreme or can adjust to the shape that is greater than sleeve lower extreme size, and the lower part of hoisting piece forms the bearing to the bottom plate, realizes the hoist and mount of bottom plate. The loading and unloading of the hoisting piece can be completed by hands, and the hoisting piece is convenient and fast. The bottom plate is convenient to produce and simple and convenient to construct. The method is used for producing, hoisting, transporting and installing the prefabricated bottom plate of the composite floor slab.

Description

Perforated prefabricated bottom plate of laminated floor slab and hoisting structure thereof

Technical Field

The utility model relates to the technical field of building structures, in particular to a prefabricated bottom plate of a composite floor slab in an assembly type building and a hoisting structure thereof.

Background

The composite floor slab is a structure combined by a prefabricated bottom plate and a post-cast concrete composite layer. At present, the laminated floor slab mainly comprises the following components.

1. Steel bar truss concrete superimposed sheet (thickness of the prefabricated bottom plate is at least 60mm)

The steel bar truss concrete composite slab is called steel bar truss composite slab for short, and the manufacturing and construction method comprises the following steps: firstly, binding plate bottom reinforcing steel bars and truss reinforcing steel bars in a factory, pouring concrete of a prefabricated part in a prefabricated factory, performing certain rough treatment on the surface of the prefabricated part, hoisting and transporting the prefabricated part to a construction site after the concrete of the prefabricated part reaches certain strength, and finally completing other construction procedures of the laminated slab on the site. The prefabricated truss steel bar and reinforced concrete prefabricated bottom plate plays a role of a bottom template in a construction site, workers bind surface layer steel bars on the bottom plate, and then concrete on the upper layer portion is poured.

The steel bar truss composite slab has wide application, but still has certain defects, which mainly comprise: firstly, the truss steel bars are complex to manufacture, and the production process of the laminated slab is increased. Secondly, the steel consumption of the floor slab is increased by the truss steel bars, and the cost is high. And thirdly, the increase of the rigidity of the floor slab by the truss steel bars is limited, and the floor slab needs to be additionally supported under construction load. Fourthly, the minimum thickness of the prefabricated bottom plate of the steel bar truss laminated slab is 60mm, the self weight of the prefabricated bottom plate is large, and hoisting and operation are inconvenient. The total thickness of the laminated floor slab is large, wherein the thickness of the prefabricated bottom slab is 60mm, the thickness of the post-cast concrete laminated layer is 70mm, the total thickness is generally not less than 130mm, and the thickness of the common cast-in-place floor slab is mainly 100 mm. In residential buildings, the span of the floor slab is more than 4m, the thickness of a common cast-in-place floor slab is generally 100-110 mm, but the thickness of the steel bar truss composite slab is 130mm or more, and for the floor slab with the span less than 4m, the steel bar truss composite slab can increase the consumption of more concrete and steel bars compared with the cast-in-place floor slab.

2. Prestressed concrete superimposed sheet (thickness of prefabricated base plate at least 50mm)

The prestressed concrete superimposed sheet and steel bar truss superimposed sheet's difference lies in: no steel bar truss is needed, and the bottom stressed steel bar adopts prestressed steel bars. During production, prestressed reinforcements are tensioned, and cracks and deflection of the prefabricated bottom plate are reduced by applying prestress. The construction method is basically the same as that of the prestressed concrete composite slab, the bottom of the prestressed concrete composite slab is supported, and the upper part of the prestressed concrete composite slab is tied with steel bars to cast concrete in situ.

3. Prestressed steel pipe truss concrete superimposed sheet (thickness of prefabricated base plate at least 35mm)

The prestressed steel pipe truss concrete laminated slab combines the characteristics of the reinforced concrete truss concrete laminated slab and the prestressed concrete laminated slab, the bottom of the slab adopts prestressed steel bars, and the upper part of the slab adopts a steel pipe truss to improve the integral rigidity. The main truss rib of the steel bar truss concrete laminated slab is a steel bar truss made of steel bars, the prestressed steel pipe truss concrete laminated slab is a steel pipe truss, and the main rib is a steel pipe.

PK prestressed laminate (thickness of prefabricated base plate at least 30mm)

The PK prestressed concrete composite floor slab is a composite floor slab formed by improving prefabricated composite components on the basis of the traditional concrete composite floor slab. Its bottom plate is an inverted T-shaped prestressed concrete prefabricated ribbed thin plate, the prestressed bars are high-strength steel wires with helical ribs for eliminating stress, and a plurality of holes are reserved on the ribs. The direction of the holes is parallel to the direction of the plane of the bottom plate. During construction, the bottom plate is first laid, transverse perforated steel bars are then inserted into the holes in the ribs, broken line type or parallel short bars meeting the requirement of anchoring length are arranged at the joints of the bottom plate, and concrete is poured to form the integral bidirectional stressed floor.

The PK prestressed laminated slab has the following characteristics: firstly, the prefabricated bottom plate is made of high-strength concrete, and prestressed tendons are arranged in the prefabricated bottom plate, and the thickness of the prefabricated bottom plate is generally not more than 90 mm. Secondly, the prefabricated bottom plate is of a ribbed structure, the adhesive section of new and old concrete is larger due to the ribs, mechanical engaging force of the prefabricated bottom plate is increased by the perforated ribs in the holes and the fold-line-shaped reinforcing steel bars of the connecting plate and the plate, and the laminated plate can work together through the construction process, so that the laminated plate is good in integrity. And thirdly, the prestressed steel bars in the prefabricated bottom plate and the abutted seam steel bars arranged at the abutted seam enable the laminated slab to have better crack resistance. Fourthly, arranging perforated steel bars in the reserved holes, and enabling the whole laminated floor slab to have the characteristic of bidirectional stress. Therefore, compared with the common floor slab, the PK prestressed concrete laminated slab has better bearing capacity and higher rigidity.

5. Combined prefabricated soleplate (prefabricated soleplate at least 40mm)

The patent with publication number CN 109083320 a discloses a combined prefabricated bottom plate and composite floor slab structure and a construction method of composite floor slab, wherein the combined prefabricated bottom plate comprises a prefabricated bottom plate and a supporting piece, a connecting piece is embedded in the prefabricated bottom plate, the upper end of the connecting piece penetrates out of the upper surface of the prefabricated bottom plate, any side of the upper side and the lower side of the prefabricated bottom plate is connected with the supporting piece, and the supporting piece is detachably connected with the connecting piece. According to the scheme, the bending resistance bearing capacity, the shearing resistance bearing capacity and the cracking resistance of the prefabricated bottom plate after forming can be adjusted by adjusting the supporting piece or the connecting piece, and the technical problem that the prefabricated bottom plate is thin and cannot meet various spans is solved.

The bearing capacity and rigidity of the prefabricated bottom plate are improved by adopting the schemes of the laminated slabs, or by using a truss, or by using prestress, or by using a concrete rib, or by using a supporting piece (such as a steel beam) as a reinforcing means, so that the effect of reducing the thickness of the bottom plate is achieved, and the purpose of reducing the weight of a prefabricated part is achieved. In either method, the manufacturing process and cost are increased in the production stage, which is not straightforward and simple. Specifically, the method comprises the following steps: the steel bar truss needs a special steel bar processing machine. Secondly, the steel bar needs to be tensioned by prestressing force, and tensioning equipment and procedures need to be added; in addition, the prestressed prefabricated bottom plate is easy to generate inverted arch and is not easy to control, and referring to fig. 1, when the prefabricated bottom plate is spliced, the flatness of the spliced seam cannot be guaranteed. And thirdly, the concrete rib formwork is very complicated to pour. And fourthly, the prefabricated bottom plate is reinforced by the steel beams, the step of mounting the steel beams is required to be added during production, the size of the whole prefabricated bottom plate is increased by the steel beams, the stacking quantity is reduced due to the stacking limit during transportation, and the cost for amortizing, transporting and recycling the steel beams is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a prefabricated bottom plate of a composite floor slab, which is convenient to prefabricate and hoist.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the perforated prefabricated bottom plate for the composite floor slab comprises a bottom plate and sleeves, wherein the bottom plate is made of concrete provided with a reinforcing mesh, a plurality of hoisting points are arranged on the bottom plate, through holes are formed in the hoisting points, and the hollow sleeves are arranged in the through holes.

Specifically, the method comprises the following steps: the sleeve is a steel pipe with a round cross section, and the center line direction of the steel pipe is vertical to the plane of the bottom plate.

Specifically, the method comprises the following steps: the thickness of the bottom plate is more than or equal to 30mm, and at least three hoisting points are arranged on the bottom plate.

Specifically, the method comprises the following steps: the lower end of the sleeve is flush with the bottom surface of the bottom plate, and the upper end of the sleeve exceeds the top surface of the bottom plate.

Specifically, the method comprises the following steps: the inner diameter of the sleeve is 20-200 mm, and the concrete of the bottom plate is C30 fine stone concrete.

Specifically, the method comprises the following steps: the sleeve is connected with the reinforcing mesh by welding or binding.

Specifically, the method comprises the following steps: the outside of the concrete part of the sleeve embedded in the bottom plate is provided with an expansion disc.

The perforated prefabricated bottom plate of the composite floor slab has the advantages that: the sleeve is arranged at the hoisting point of the bottom plate for hoisting, and the bottom plate only needs to be provided with the sleeve before concrete pouring, so that the construction is simple and convenient. The reinforcing mesh is arranged in the concrete of the bottom plate, and a prestress structure is not adopted, so that the phenomenon of inverted arch is avoided. When the bottom plate is hoisted, the hoisting device is arranged at the position of the sleeve for hoisting, and the hoisting device is convenient to disassemble and assemble.

The lower end of the sleeve is flush with the bottom surface of the bottom plate, so that the bottom plate is convenient to pour, and meanwhile, the bottom plate is convenient to stack. The upper end of the sleeve pipe exceeds the top surface of the bottom plate, and the part of the sleeve pipe exceeding the top surface of the bottom plate is directly poured on the post-poured concrete superposed layer, so that the strength of a hoisting point is increased. The outside of the concrete part of the embedded bottom plate of the sleeve is provided with an expansion disc, so that the sleeve is combined with the concrete more tightly.

The utility model also provides a prefabricated bottom plate hoisting structure, which solves the problem that the existing hoisting structure is inconvenient to install and disassemble a hoisting tool, and adopts the technical scheme that: laminated floor perforation formula prefabricated bottom plate hoisting structure, including above-mentioned arbitrary laminated floor perforation formula prefabricated bottom plate to and hoist and mount piece, the size of hoist and mount piece's upper end or lower extreme is less than sheathed tube downthehole size, and the upper portion of hoist and mount piece sets up and is used for lifting hole or rings with hoisting device complex, and the middle part of hoist and mount piece is worn to locate in the sleeve, and the size of the lower part of hoist and mount piece is greater than the size of sleeve lower extreme or can adjust to the shape that is greater than sleeve lower extreme size.

Specifically, the method comprises the following steps: the hoist and mount piece is for lifting by crane tray and fag end, lifts by crane the tray and is the shape of falling T on the vertical section, lifts by crane the tray and includes horizontal part and vertical portion, and the horizontal part holds in the palm in the bottom surface of bottom plate, and vertical portion is located the cover intraductally, and the fag end is connected at the top of vertical portion, and the fag end forms rings.

Or the hoisting piece comprises a hoisting bracket and a rope sleeve, the hoisting bracket comprises a vertical rod and a cross rod, the rope sleeve is connected to the top of the vertical rod, the rope sleeve forms a hoisting ring, and the bottom of the vertical rod is rotatably connected with the cross rod.

The perforated prefabricated bottom plate hoisting structure for the composite floor slab has the beneficial effects that: one end of the hoisting piece penetrates into the sleeve, the lower part of the hoisting piece supports the bottom plate, the middle part of the hoisting piece penetrates into the sleeve, and the upper part of the hoisting piece is provided with a hoisting hole or a hoisting ring for being matched with a hoisting device to realize hoisting of the bottom plate. The hoisting piece can be mounted and dismounted on the sleeve by hands, and the hoisting piece is convenient and fast. The size of the lower part of the hoisting piece is larger than that of the lower end of the sleeve or can be adjusted to be larger than that of the lower end of the sleeve, so that the stressed contact surface between the lower part of the hoisting piece and the bottom plate can be enlarged during hoisting, stress concentration is reduced, and the bottom plate is thin and cannot be cracked, pulled off and the like due to the stress concentration. During hoisting, the bottom plate is stressed at a plurality of hoisting points simultaneously, the stress span is reduced, and the plate thickness is reduced. After the production of the bottom plate is finished, the lifting, the transportation and the installation are safe, reliable and free of cracking. The hoisting piece is a hoisting bracket and a rope sleeve, and the hoisting piece can penetrate into the sleeve from the upper end or the lower section, so that the operation is convenient.

Drawings

FIG. 1 is a schematic representation of the prior art inverted arch creation using pre-stressed prefabricated panels.

Fig. 2 is a schematic structural view of an embodiment of the perforated prefabricated bottom plate of the composite floor slab of the utility model.

Fig. 3 is a schematic view of the perforated prefabricated bottom plate for composite floor slab during hoisting.

Fig. 4 is a schematic view of a perforated prefabricated bottom plate hoisting structure of a composite floor slab.

Fig. 5 is a schematic view of a perforated prefabricated bottom plate hoisting structure of a composite floor slab, according to a second embodiment of the utility model.

Parts, positions and numbers in the drawings: the steel bar net piece comprises a steel bar net piece 1, concrete 2, a sleeve 3, a hoisting tray 4, a rope sleeve 5 and a hoisting bracket 6; a hanger 7 and a lifting rope 8.

Detailed Description

The utility model will be further explained with reference to the drawings.

As shown in figure 2, the perforated prefabricated bottom plate of the composite floor slab comprises a bottom plate and a sleeve 3, wherein the bottom plate is concrete 2 provided with a steel mesh sheet 1, and the thickness of the bottom plate is more than or equal to 30mm, for example, 30-200 mm. The steel bar mesh 1 is determined by calculation according to the stress condition, a non-prestressed structure is selected, and the concrete 2 can be C30 fine stone concrete. The bottom plate is provided with a plurality of hoisting points, the hoisting points are provided with through holes, the through holes penetrate through the top surface and the bottom surface of the bottom plate, and hollow sleeves 3 are arranged at the through holes. The sleeve 3 is mounted in place prior to the casting of the concrete 2, and after casting the sleeve 3 and the concrete 2 are joined as a unit.

The hoisting points on the bottom plate are at least three, so that the balance of the bottom plate during hoisting is ensured. The number of hoisting points is generally four or more, and preferably an even number, the hoisting points being arranged uniformly in the rows and columns of the base plate. For example, for a base plate with the size not exceeding 2 x 2m, four hoisting points can be uniformly arranged; for floors of sizes exceeding 2 x 2m, six or more hoisting points can be provided. At the hoisting point, the reinforcing mesh sheets 1 are arranged in an encrypted manner, namely the arrangement density of the reinforcing mesh sheets 1 at the hoisting point is greater than that of the reinforcing mesh sheets 1 at other parts.

The sleeve 3 is preferably made of steel, so that the cost is low, and the sleeve is favorably and stably combined with the concrete 2. The inner hole of the sleeve 3 is preferably a round hole, namely the sleeve 3 is a steel pipe with a round cross section; the central line of the steel pipe is preferably vertical to the plane of the bottom plate. The inside of the sleeve 3 is preferably a flat curved surface, and the outside of the sleeve 3 may be a flat curved surface or a screw thread shape, so that the sleeve 3 and the concrete 2 are more firmly combined. The thickness of sleeve pipe 3 can equal in upper and lower part, perhaps the outside of the 2 parts of concrete of the embedding bottom plate of sleeve pipe 3 sets up the extension dish, and the extension dish is discoid, not only makes sleeve pipe 3 and concrete 2 combine more firmly, but also can the bearing reinforcing bar net piece 1, guarantees the thickness of reinforcing bar net piece 1 upper and lower side concrete 2. The inner hole of the sleeve 3 is used for placing a hoisting piece, and the inner diameter of the sleeve 3 is 20-200 mm. The lower end of the sleeve 3 is preferably flush with the bottom surface of the base plate, and the upper end of the sleeve 3 may be flush with the top surface of the base plate or the upper end of the sleeve 3 may extend beyond the top surface of the base plate. When the upper end of the sleeve 3 extends beyond the top surface of the base plate, the length of the sleeve 3 preferably does not exceed the sum of the thicknesses of the base plate and the post-cast concrete laminate. The sleeve 3 may be cylindrical with a large upper portion and a large lower portion, or may be circular truncated cone with a small upper portion and a large lower portion. The sleeve 3 can be directly embedded in the concrete 2 and is not in direct contact with the reinforcing mesh sheet 1. Or the sleeve 3 is connected with the reinforcing mesh sheet 1 in a welding or binding manner.

The second subject of the utility model is: laminated floor perforation formula prefabricated bottom plate hoisting structure, including above-mentioned first theme laminated floor perforation formula prefabricated bottom plate to and hoist and mount piece, realize hoisting the bottom plate fast, conveniently, safely. The hoisting piece is used for being connected to a hoisting point of the bottom plate, and the size of the upper end or the lower end of the hoisting piece is smaller than the inner size of the hole of the sleeve 3, so that the hoisting piece can penetrate into the sleeve 3. And the upper part of the hoisting piece is provided with a hoisting hole or a hoisting ring, and the hoisting hole and the hoisting ring are used for being matched with the hoisting device. Referring to fig. 3, the lifting device comprises a hanger 7 and a lifting rope 8, and the lower ends of the lifting rope 8 are respectively connected with lifting points of the bottom plate. The middle part of the sling is arranged in the sleeve 3 in a penetrating way, so the size of the middle part of the sling is smaller than the size of the hole of the sleeve 3. The lower part of the sling is used to support the underside of the base plate, so that the size of the lower part of the sling is larger than the size of the lower end of the sleeve 3 or can be adjusted to a shape larger than the size of the lower end of the sleeve 3. The lower part of the sling is in two cases, the first one being: the size of the lower part of the hoisting piece is fixed and is larger than the aperture of the inner hole at the lower end of the sleeve 3, and the upper end of the hoisting piece can penetrate into the sleeve 3 from the bottom surface of the bottom plate; the second case is: the shape of the lower part of the sling can be adjusted to two states, wherein in one state, the size of the lower part of the sling is larger than the aperture of the inner hole at the lower end of the sleeve 3.

The following examples are given by way of illustration. As shown in fig. 4, the hoisting piece is a hoisting tray 4 and a rope sling 5. The lifting tray 4 is inverted T-shaped in longitudinal section, and the lifting tray 4 includes a horizontal portion and a vertical portion, which are preferably integral. The horizontal part of the hoisting tray 4 has a bearing effect on the bottom surface of the bottom plate from the lower end of the casing pipe 3, the vertical part penetrates into the casing pipe 3 from the bottom surface of the bottom plate, the top of the vertical part can be directly connected with a lifting rope 8 of the hoisting device, or the top of the vertical part is connected with a rope sling 5, and the rope sling 5 forms a hoisting ring. The rope sling 5 can be directly connected with the lifting rope 8, or the lower end of the rope sling 5 is provided with a lifting hook and then connected with the rope sling 5. The length of the vertical portion is preferably greater than the length of the sleeve 3.

Another embodiment of the sling is given below. As shown in fig. 5, the hoisting member is a hoisting bracket 6 and a rope sling 5, the hoisting bracket comprises a vertical rod and a cross rod, the top of the vertical rod is connected with the rope sling 5, and the rope sling 5 forms a hoisting ring. The bottom of the vertical rod is rotatably connected with a cross rod, for example, the middle part of the cross rod is connected with the bottom of the vertical rod through a pin. The vertical rod is rotated to enable the vertical rod and the cross rod to be superposed with each other, and the hoisting bracket 6 can penetrate through the upper part or the lower part of the sleeve 3; the transverse rod is rotated to enable the transverse rod to be perpendicular to the vertical rod, and then the lifting device can be used for lifting the bottom plate. The vertical rod is preferably one, and the cross rod can be one or more, for example, two cross rods. In addition, the cross rod and the vertical rod of the lifting bracket 6 are rotatably connected, pin holes can be formed in the bottom of the vertical rod, and the cross rod directly penetrates through the pin holes.

Claims

1. Coincide floor perforation formula prefabricated bottom plate, its characterized in that: including bottom plate and sleeve pipe, concrete (2) for setting up reinforcing bar net piece (1) are set up a plurality of hoisting points on the bottom plate, and hoisting point department sets up the through-hole, and through-hole department sets up hollow sleeve pipe (3), and the outside of the concrete (2) part of the embedding bottom plate of sleeve pipe (3) sets up the extension dish.

2. A laminated floor perforated precast floor panel as recited in claim 1, wherein: the sleeve (3) is a steel pipe with a circular cross section, and the center line direction of the steel pipe is vertical to the plane of the bottom plate.

3. A laminated floor perforated precast floor panel as recited in claim 1, wherein: the thickness of the bottom plate is more than or equal to 30mm, and at least three hoisting points are arranged on the bottom plate.

4. A laminated floor perforated precast floor panel as recited in claim 1, wherein: the lower end of the sleeve (3) is flush with the bottom surface of the bottom plate, and the upper end of the sleeve (3) exceeds the top surface of the bottom plate.

5. A laminated floor perforated precast floor panel as recited in claim 1, wherein: the inner diameter of the sleeve (3) is 20-200 mm, and the concrete (2) of the bottom plate is C30 fine stone concrete.

6. A perforated precast floor slab of a composite floor according to any of claims 1 to 5, characterized in that: the sleeve (3) is connected with the reinforcing mesh (1) in a welding or binding way.

7. Coincide floor perforation formula prefabricated bottom plate hoisting structure, its characterized in that: the composite floor perforated prefabricated bottom plate comprises the composite floor perforated prefabricated bottom plate and a hoisting piece, wherein the size of the upper end or the lower end of the hoisting piece is smaller than the inner size of a sleeve (3), the upper part of the hoisting piece is provided with a hoisting hole or a hoisting ring matched with a hoisting device, the middle part of the hoisting piece is arranged in the sleeve (3) in a penetrating mode, and the size of the lower part of the hoisting piece is larger than the size of the lower end of the sleeve (3) or can be adjusted to be larger than the size of the lower end of the sleeve (3).

8. The perforated precast floor slab hoisting structure of composite floor slab as claimed in claim 7, wherein: the hoist and mount piece is for lifting by crane tray (4) and fag end (5), lifts by crane tray (4) and is the shape of falling T on the vertical section, lifts by crane tray (4) and includes horizontal part and vertical portion, and the horizontal part holds in the palm in the bottom surface of bottom plate, and vertical portion is located sleeve pipe (3), and fag end (5) are connected at the top of vertical portion, and fag end (5) form rings.

9. The perforated precast floor slab hoisting structure of composite floor slab as claimed in claim 7, wherein: the hoisting piece comprises a hoisting bracket (6) and a rope sleeve (5), the hoisting bracket comprises a vertical rod and a horizontal rod, the rope sleeve (5) is connected to the top of the vertical rod, the rope sleeve (5) forms a hoisting ring, and the bottom of the vertical rod is rotatably connected with the horizontal rod.