CN214461630U

CN214461630U - Prefabricated bottom plate of composite floor slab

Info

Publication number: CN214461630U
Application number: CN202022788171.9U
Authority: CN
Inventors: 邹胜斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-10-22
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a coincide floor prefabricated bottom plate relates to the assembly type structure field, and the technical problem of solution provides the coincide floor prefabricated bottom plate of being convenient for prefabricate, also be convenient for hoist and mount. The utility model adopts the technical proposal that: coincide floor prefabricated bottom plate, including bottom plate and hoist and mount piece, the bottom plate sets up a plurality of hoist and mount points for setting up the concrete of reinforcing bar net piece on the bottom plate, and hoist and mount point department sets up hoist and mount piece, and in the size of the lower part of hoist and mount piece was greater than the size on upper portion and embedded concrete, the upper portion of hoist and mount piece was located the upper surface of bottom plate, and the top of hoist and mount piece sets up hoisting structure. The bottom plate only needs to install the hoisting piece before pouring concrete, and the construction is simple and convenient. The bottom plate adopts a non-prestressed structure, so that the phenomenon of reverse arching is avoided. The hoisting device is connected with the hoisting structure at the top of the hoisting piece and then hoisted, and the hoisting device and the hoisting structure are convenient to disassemble and assemble. The utility model is used for the production of coincide floor prefabricated bottom plate, the prefabricated bottom plate of being convenient for lift by crane, transport and install.

Description

Prefabricated bottom plate of composite floor slab

Technical Field

The utility model relates to a building structure technical field, concretely relates to prefabricated bottom plate of coincide floor in assembly type structure.

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 to-be-solved technical problem of the utility model is to provide a coincide floor prefabricated bottom plate convenient to it is prefabricated, also be convenient for hoist and mount.

The utility model provides a technical scheme that its technical problem adopted is: coincide floor prefabricated bottom plate, including bottom plate and hoist and mount piece, the bottom plate sets up a plurality of hoist and mount points for setting up the concrete of reinforcing bar net piece on the bottom plate, and hoist and mount point department sets up hoist and mount piece, and in the size of the lower part of hoist and mount piece was greater than the size on upper portion and embedded concrete, the upper portion of hoist and mount piece was located the upper surface of bottom plate, and the top of hoist and mount piece sets up hoisting structure.

Specifically, the method comprises the following steps: the hoisting structure of the hoisting piece is a hoisting ring, a hoisting hook or a hoisting hole.

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 concrete of the bottom plate is C30 fine stone concrete.

Specifically, the method comprises the following steps: the arrangement density of the steel mesh sheets at the hoisting points is greater than that of the steel mesh sheets at other positions.

Specifically, the method comprises the following steps: the hoisting piece is made of steel, and the lower part of the hoisting piece is welded or bound with the reinforcing mesh.

Specifically, the method comprises the following steps: the hoisting piece is a tray, the lower part of the tray is in an inverted T shape in longitudinal section, and the top of the tray is connected with a hanging ring.

Specifically, the method comprises the following steps: the middle part of hoist and mount piece is the connecting rod, and rings are connected at the top of connecting rod, connects three piece at least splice bars around the connecting rod bottom, and the outer end of splice bar sets up the crotch and links to each other with the reinforcing bar net piece.

Specifically, the method comprises the following steps: the hoisting piece comprises a first steel bar and a second steel bar, the first steel bar is in an omega shape, and the middle part of the omega shape is in an arch shape; the middle part of the second steel bar is n-shaped, and two straight flat sides of the n-shape are respectively bent for 90 degrees towards opposite directions; the arch of the first steel bar and the n-shaped superposition of the second steel bar are bound or welded with the steel bar net piece, and the first steel bar and the second steel bar form a lifting hole on the top surface of the bottom plate. Or the hoisting piece comprises a third steel bar and a fourth steel bar, the third steel bar is n-shaped, the middle part of the fourth steel bar is n-shaped, two straight flat edges of the n-shaped steel bars are respectively bent to the same direction by 90 degrees, and the third steel bar is sleeved at the bent part of the fourth steel bar and is welded or bound and connected; the bent edges of the third steel bars and the fourth steel bars are respectively bound with the steel bar net sheets or welded, and the middle parts of the fourth steel bars form lifting holes on the top surface of the bottom plate.

More specifically: the tail ends of the first reinforcing steel bar and the second reinforcing steel bar are respectively provided with a hook and are bound and connected with the reinforcing steel bar mesh; the tail ends of the third steel bar and the fourth steel bar are respectively provided with a hook and are bound and connected with the steel bar net piece.

The utility model has the advantages that: the hoisting point of the bottom plate is provided with the sleeve for hoisting, and the bottom plate is only required to be provided with a hoisting piece 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. The hoisting device is connected with the hoisting structure at the top of the hoisting piece and then hoisted, and the hoisting device and the hoisting structure are convenient to disassemble and assemble. The size of the lower part of the hoisting piece is larger than that of the upper part of the hoisting piece and the hoisting piece is embedded into concrete, so that the stress between the lower part of the hoisting piece and the bottom plate is increased, stress concentration is reduced, and the bottom plate is thin and cannot be cracked, pulled off and the like due to the stress concentration. Set up a plurality of hoist and mount points on the bottom plate, the bottom plate atress simultaneously at a plurality of hoist and mount points during hoist and mount reduces the atress span, and the board is thick can reduce. After the production of the bottom plate is finished, the lifting, the transportation and the installation are safe, reliable and free of cracking.

The arrangement density of the steel mesh at the hoisting point is higher, and the strength at the hoisting point is increased. The lower part of the hoisting piece is welded or bound with the reinforcing mesh, so that the integrity between the hoisting piece and the bottom plate is improved, and the hoisting piece is prevented from slipping. The hoisting piece comprises a first reinforcing steel bar and a second reinforcing steel bar, so that the construction is convenient, and the cost is low.

Drawings

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

Fig. 2 is the structural schematic diagram of the first embodiment of the prefabricated bottom plate of composite floor slab of the utility model.

Figure 3 is the structural schematic diagram of the utility model discloses coincide floor precast floor board second embodiment.

Figure 4 is a schematic top view of the sling of figure 3.

Fig. 5 is the schematic structural diagram of the third embodiment of the composite floor slab prefabricated bottom plate of the utility model.

Figure 6 is a perspective view of the sling of figure 5.

Figure 7 is a perspective view of another embodiment of the sling.

Fig. 8 is the utility model discloses schematic diagram during coincide floor precast floor board hoist and mount.

Parts, positions and numbers in the drawings: the concrete-reinforced concrete slab comprises a steel bar mesh 1, concrete 2, a tray 31, a connecting rod 32, a connecting bar 33, a first steel bar 34, a second steel bar 35, a third steel bar 36 and a fourth steel bar 37; a hanger 4 and a lifting rope 5.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 2, fig. 3 and fig. 5, the utility model discloses prefabricated bottom plate of coincide floor, including bottom plate and hoist and mount piece, the bottom plate is the concrete 2 that sets up reinforcing bar net piece 1, and the thickness of bottom plate is more than or equal to 30mm, for example is 30 ~ 200 mm. The reinforcing mesh 1 is determined by calculation according to the stress condition, and a non-prestressed structure is selected to avoid the phenomenon of reverse arching. The concrete 2 can be C30 fine stone concrete. The bottom plate is provided with a plurality of hoisting points, and the number of the hoisting points is 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 hoisting part is arranged at the hoisting point, the size of the lower part of the hoisting part is larger than that of the upper part of the hoisting part and the hoisting part is embedded into the concrete 2, so that the lower part of the hoisting part can be firmly and tightly combined with the bottom plate. The lower part of the hoisting piece can be of a tray type structure, namely, a disc is arranged at the lower part of the hoisting piece towards the peripheral direction and is embedded into the concrete 2; or at least two steel bars can be arranged and embedded in the concrete, and the embedded steel bars are preferably connected with the steel bar mesh 1; or may be as described above. The upper portion of hoisting accessory is located the upper surface of bottom plate, and hoisting structure sets up at the top of hoisting accessory. The hoisting structure is used for a structure matched with the hoisting device and can be a hoisting ring, a hoisting hook or a hoisting hole. Referring to fig. 8, the lifting device comprises a hanger 7 and a lifting rope 8, wherein the lower end of the lifting rope 8 is connected with a lifting point of the bottom plate respectively, and then the bottom plate is lifted. The hoisting piece is preferably made of steel, so that the hoisting piece is favorably and tightly combined with the concrete 2. The lower part of the hoisting piece is welded or bound with the reinforcing mesh sheet 1, so that the lower part of the hoisting piece and the bottom plate are firmly connected into a whole.

The sling is exemplified below.

As shown in fig. 2, the hanging piece is a tray 31, the lower part of the tray 31 is in an inverted T shape in longitudinal section, the lower part of the tray 31 is embedded in the concrete 2, the lower part of the tray 31 and the reinforcing mesh sheet 1 can be disconnected or connected, and the connection mode includes binding connection and welding connection. The top of the tray 31 is provided with a hanging hole or a connecting hanging ring.

Another embodiment concerning the sling is given below. As shown in figures 3 and 4, the sling has a connecting rod 32 in the middle, the connecting rod 32 is preferably a solid steel bar, and the top of the connecting rod 32 is connected with a hanging ring, or the top of the connecting rod 32 is directly bent to form a hook. At least three connecting ribs 33 are connected around the bottom of the connecting rod 32, the connecting rod 32 and the connecting ribs 33 are preferably welded, the connecting ribs 33 are radially arranged around the connecting rod 32 and are located on the same plane, the lower portion of the connecting rod 32 and all the connecting rods 32 are embedded in the concrete 2, and the outer ends of the connecting ribs 33 are provided with hooks and are connected with the reinforcing mesh 1.

Another embodiment concerning the sling is given below. As shown in figures 5 and 6, the sling comprises a third bar 36 and a fourth bar 37. The third reinforcing bar 36 is n-shaped and is fully embedded in the concrete 2 in use. The middle part of the fourth steel bar 37 is n-shaped, and two straight edges of the n-shape are respectively bent by 90 degrees towards the same direction. The third reinforcing bar 36 is sleeved on the bent part of the fourth reinforcing bar 37 and welded or bound, see fig. 6. The whole of third reinforcing bar 36 and the limit of buckling of fourth reinforcing bar 37 are binded or welded connection with reinforcing bar net piece 1 respectively, and the middle part of fourth reinforcing bar 37 exposes and forms the lewis hole at the top surface of bottom plate.

Another embodiment concerning the sling is given below. As shown in figure 6, the sling comprises a first reinforcing bar 34 and a second reinforcing bar 35. The first reinforcing bar 34 is omega-shaped, and the middle part of the omega-shape is an n-shaped arch. The middle part of the second steel bar 35 is n-shaped, and two straight flat sides of the n-shape are respectively bent by 90 degrees towards opposite directions. The arch of the first reinforcement bar 34 and the n-shaped overlap of the second reinforcement bar 35 are preferably tied or welded together to form a unitary assembly. The arch of the first steel bar 34 and the n-shaped of the second steel bar 35 are overlapped and then are bound or welded with the steel bar mesh 1, the lower part of the first steel bar 34 and the lower part of the second steel bar 35 are embedded into the concrete 2, and the upper part of the first steel bar 34 and the upper part of the second steel bar 35 form a hanging hole on the top surface of the bottom plate.

In the two embodiments, hooks may be further disposed at the ends of the first reinforcing bar 34 and the second reinforcing bar 35, and are bound to the mesh sheet 1. The ends of the third reinforcing steel bar 36 and the fourth reinforcing steel bar 37 can also be respectively provided with hooks and connected with the reinforcing mesh sheet 1 in a binding way.

Claims

1. Coincide floor prefabricated bottom plate, its characterized in that: including bottom plate and hoist and mount piece, concrete (2) for setting up reinforcing bar net piece (1) are set up a plurality of hoist and mount points on the bottom plate, and hoist and mount point department sets up hoist and mount piece, and in the size that the size of the lower part of hoist and mount piece was greater than upper portion and embedded concrete (2), the upper portion of hoist and mount piece was located the upper surface of bottom plate, and the top of hoist and mount piece sets up hoisting structure.

2. A composite floor slab precast floor panel as set forth in claim 1, wherein: the hoisting structure of the hoisting piece is a hoisting ring, a hoisting hook or a hoisting hole.

3. A composite floor slab precast floor panel as set forth 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 composite floor slab precast floor panel as set forth in claim 1, wherein: the concrete (2) of the bottom plate is C30 fine stone concrete.

5. A composite floor slab precast floor panel as set forth in claim 1, wherein: the arrangement density of the steel mesh (1) at the hoisting point is greater than that of the steel mesh (1) at other positions.

6. A composite floor slab precast floor panel as set forth in claim 1, wherein: the hoisting piece is made of steel, and the lower part of the hoisting piece is welded or bound with the reinforcing mesh (1).

7. A composite floor slab precast floor as claimed in any one of claims 1 to 6, wherein: the hoisting piece is a tray (31), the lower part of the tray (31) is in an inverted T shape in the longitudinal section, and the top of the tray (31) is connected with a hoisting ring.

8. A composite floor slab precast floor as claimed in any one of claims 1 to 6, wherein: the middle part of hoist and mount piece is connecting rod (32), and rings are connected at the top of connecting rod (32), connects three piece at least splice bars (33) around connecting rod (32) bottom, and the outer end of splice bar (33) sets up the crotch and links to each other with reinforcing bar net piece (1).

9. A composite floor slab precast floor as claimed in any one of claims 1 to 6, wherein: the hoisting piece comprises a first steel bar (34) and a second steel bar (35), the first steel bar (34) is omega-shaped, and the middle part of the omega-shape is arched; the middle part of the second steel bar (35) is n-shaped, and two straight flat sides of the n-shape are respectively bent for 90 degrees towards opposite directions; the arch of the first steel bar (34) and the n-shaped superposition of the second steel bar (35) are bound or welded with the steel bar mesh (1), and the first steel bar (34) and the second steel bar (35) form a lifting hole on the top surface of the bottom plate;

or the hoisting piece comprises a third steel bar (36) and a fourth steel bar (37), the third steel bar (36) is n-shaped, the middle part of the fourth steel bar (37) is n-shaped, two straight flat edges of the n-shaped steel bars are respectively bent by 90 degrees towards the same direction, and the third steel bar (36) is sleeved at the bent part of the fourth steel bar (37) and is welded or bound; the bent edges of the third steel bars (36) and the fourth steel bars (37) are respectively bound or welded with the steel bar net sheets (1), and the middle parts of the fourth steel bars (37) form lifting holes on the top surface of the bottom plate.

10. A composite floor slab precast floor panel as set forth in claim 9, wherein: the tail ends of the first reinforcing steel bar (34) and the second reinforcing steel bar (35) are respectively provided with a hook and are bound and connected with the reinforcing steel bar mesh (1); the tail ends of the third steel bar (36) and the fourth steel bar (37) are respectively provided with a hook and are connected with the steel bar net piece (1) in a binding way.