Laminated slab and prefabricated bottom slab for laminated slab

Abstract

The utility model provides a prefabricated bottom plate for a laminated slab and the laminated slab adopting the prefabricated bottom plate, the prefabricated bottom plate comprises a bottom plate body and a prestress unit, and the bottom plate body is a prefabricated part; the prestress unit is arranged on the bottom face of the bottom plate body and comprises two anchor seats and at least one prestress tensioning piece, the two anchor seats are installed at the two opposite ends of the bottom plate body respectively, the prestress tensioning piece is tensioned, and the two ends of the prestress tensioning piece are locked on the two anchor seats respectively. According to the utility model, the prestressed unit is arranged at the bottom of the bottom plate body, and the structural rigidity and strength of the bottom plate body can be effectively improved through the tensioning of the prestressed tensioning piece, so that the bottom plate body can meet the performance requirements under the condition that the bottom plate body is not provided with a steel bar truss, the steel consumption can be obviously saved, and the building cost is reduced; and the prefabrication process of the bottom plate body can be simplified, and the manufacturing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of building engineering, specifically relates to a prefabricated bottom plate for laminated slab and laminated slab adopting the prefabricated bottom plate. BACKGROUND

[0002] The traditional laminated floor slab is a concrete bottom plate with steel bar truss, and the concrete bottom plate is transported to the construction site, and then the concrete pouring of the upper plate is carried out. The steel bar truss can enhance the overall rigidity of the concrete bottom plate, improve the bearing capacity and overall stability of the concrete bottom plate, and form effective shear connection between the concrete bottom plate and the cast-in-place surface layer, thereby improving the shear capacity of the laminated surface. However, the concrete bottom plate with steel bar truss has problems such as complex prefabrication process and large amount of steel, which increases the construction cost; especially for large-span laminated floor slab, the steel bar truss needs to be made larger and higher, and the construction cost increases more obviously. SUMMARY

[0003] In view of the technical defects and technical disadvantages in the prior art, the utility model embodiment provides a prefabricated bottom plate for laminated slab and laminated slab adopting the prefabricated bottom plate, which overcomes the above problems or at least partially solves the above problems.

[0004] The prefabricated bottom plate for laminated slab includes a bottom plate body and a prestressed unit, the bottom plate body is a prefabricated part; the prestressed unit is arranged on the bottom surface of the bottom plate body and includes two anchor seats and at least one prestressed tensioning piece, the two anchor seats are respectively installed at opposite ends of the bottom plate body, and the prestressed tensioning piece is tensioned and locked at both ends of the two anchor seats.

[0005] Preferably, the bottom plate body is arched upward.

[0006] Preferably, the two anchor seats are detachably connected with the bottom plate body.

[0007] Preferably, bolt assembly holes are arranged on the bottom plate body, and the anchor seats are detachably installed on the bottom plate body through a plurality of bolts.

[0008] Preferably, the prestressed tensioning piece is detachably connected with the anchor seat.

[0009] Preferably, both ends of the prestressed tensioning piece have threaded connection sections, and are locked on the anchor seat through locking nuts screwed on the threaded connection sections.

[0010] Preferably, the precast base plate further includes a tensioning jack, which is a bidirectional tensioning jack. The prestressed tensioning member includes a first tensioning section and a second tensioning section that are respectively locked and connected to the two anchor seats. The tensioning jack is located between the two anchor seats and is tensioned and connected to the first tensioning section and the second tensioning section respectively.

[0011] Preferably, the prestressed unit has multiple prestressed tension members arranged side by side, and the arrangement direction of each prestressed tension member is perpendicular to the axial direction of the tension member and parallel to the bottom surface of the base plate body.

[0012] Preferably, the anchor is an L-shaped component, including a first plate that is fitted and connected to the base plate body and a second plate that is perpendicularly connected to the first plate. The two ends of the prestressed tensioning member are respectively locked and connected to the two second plates.

[0013] This utility model also provides a composite slab, including the above-mentioned precast base plate for composite slabs, on which an upper slab is cast in place.

[0014] This utility model has the following beneficial effects:

[0015] In this invention, a prestressed unit is set at the bottom of the base plate body. The tensioning of the prestressed tensioning member can effectively improve the structural stiffness and strength of the base plate body, so that the base plate body can meet the performance requirements without setting a steel truss. This not only significantly saves steel consumption and reduces construction costs, but also simplifies the prefabrication process of the base plate body and improves manufacturing efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the prefabricated base plate provided in the embodiment of this utility model;

[0017] Figure 2 for Figure 1 Another structural diagram from another perspective;

[0018] Figure 3 and Figure 4 This is a partial structural diagram of the precast base plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the present utility model, and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] As Figures 1-4 shown in the drawings, the embodiment provides a prefabricated base plate for a laminated slab, comprising a base plate body 1 and a prestressed unit, the base plate body 1 is a prefabricated part; the prestressed unit is arranged on the bottom surface of the base plate body 1, comprising two anchor seats 3 and at least one prestressed tension member 2, the two anchor seats 3 are respectively installed on the opposite two ends of the base plate body 1, and the prestressed tension member 2 is tensioned and the two ends are respectively locked on the two anchor seats 3.

[0022] The above-mentioned base plate body 1 is generally a concrete component, preferably a reinforced concrete component.

[0023] The base plate body 1 is preferably a square component, when it is a rectangular component (i.e. the horizontal cross section is rectangular), the above-mentioned two anchor seats 3 are preferably installed on the two ends in the length direction of the base plate body 1.

[0024] Among them, the anchor seat 3 is installed on the bottom surface of the base plate body 1 and protrudes downward from the bottom surface, so as to facilitate the arrangement of the prestressed tension member 2, and the prestressed tension member 2 is located below the bottom surface of the base plate body 1. It should be noted that the top surface of the base plate body 1 is a laminated surface for pouring an upper plate thereon; the bottom surface of the base plate body 1 is a surface away from the upper plate.

[0025] The above-mentioned prestressed tension member 2 is preferably made of prestressed steel, but prestressed bolts and other tension members are also applicable.

[0026] In one embodiment, as Figures 1-4 , the anchor seat 3 is an L-shaped component, comprising a first plate body 31 connected with the base plate body 1 and a second plate body 32 connected perpendicularly with the first plate body 31, and the two ends of the prestressed tension member 2 are respectively locked with the two second plate bodies 32. This way facilitates the connection between the anchor seat 3 and the base plate body 1 and the connection between the anchor seat 3 and the prestressed tension member 2.

[0027] Among them, the anchor seat 3 includes but is not limited to using angle steel, which is low in cost and has very good structural rigidity and strength.

[0028] In another embodiment, the anchor seat 3 can also be C-shaped / U-shaped, for example, the anchor seat 3 is a C-shaped / U-shaped component, a third plate body can be formed at the bottom end of the second plate body 32, which is parallel to the first plate body 31, and the notches of the two anchor seats 3 are preferably opposite.

[0029] In one embodiment, the two anchor seats 3 are detachably connected with the base plate body 1, so that the prestressed unit can be integrally detached from the base plate body 1, which can be reused and is economical and environmentally friendly. Preferably, as Figure 4, and the anchor base 3 is detachably mounted on the bottom plate body 1 through a plurality of bolts 5. In the scheme in which the anchor base 3 is an L-shaped member, a bolt through hole is correspondingly provided on the first plate body 31.

[0030] Preferably, the bolt assembly hole extends upward from the bottom of the bottom plate body 1, which can be a blind hole or a through hole. When the bolt assembly hole is a blind hole, a threaded sleeve can be pre-buried in the bolt assembly hole, and the bolt 5 is screwed with the threaded sleeve. When the bolt assembly hole is a through hole, the bolt 5 can pass through the bottom plate body 1 from bottom to top and be locked with a nut on the top surface of the bottom plate body 1. For this way, the protruding screw rod can be solidified by cast-in-place concrete when the upper layer plate is cast-in-place, thereby improving the combination between the bottom plate body 1 and the upper layer plate and the shear capacity of the superimposed surface. The pre-stressed unit can be disassembled by cutting off the bolt head. Alternatively, the bolt 5 can pass through the bottom plate body 1 from top to bottom and be locked with a nut on the bottom surface of the bottom plate body 1, and the bolt head can also be solidified by the cast-in-place concrete of the upper layer plate, thereby improving the combination between the bottom plate body 1 and the upper layer plate and the shear capacity of the superimposed surface. The pre-stressed unit can be disassembled after the nut on the bottom surface of the bottom plate body 1 is removed. Obviously, it is also feasible to use a double-headed screw rod and lock it with nuts on the top surface and the bottom surface of the bottom plate body 1, so that the pre-stressed unit can be disassembled after the nut on the bottom surface of the bottom plate body 1 is removed.

[0031] In one embodiment, the pre-stressed tensioning member 2 is detachably connected with the anchor base 3, so that at least the pre-stressed tensioning member 2 can be reused to reduce the construction cost. In particular, when the anchor base 3 is detachably connected with the bottom plate body 1 and the pre-stressed tensioning member 2 is detachably connected with the anchor base 3, both the anchor base 3 and the pre-stressed tensioning member 2 can be reused. Preferably, as shown in Figures 1-4 , the two ends of the pre-stressed tensioning member 2 have threaded connection sections, and are locked on the anchor base 3 by locking nuts screwed on the threaded connection sections.

[0032] In this embodiment, the pre-stressed unit is provided at the bottom of the bottom plate body 1, and the structural rigidity and strength of the bottom plate body 1 can be effectively improved by tensioning the pre-stressed tensioning member 2, so that the bottom plate body 1 can meet the performance requirements without setting a steel bar truss. Not only the steel consumption and the construction cost can be significantly saved, but also the prefabrication process of the bottom plate body 1 can be simplified and the production efficiency can be improved.

[0033] Correspondingly, no steel bar truss is provided on the top surface of the bottom plate body 1.

[0034] The prestress of the prestress tensioning member 2 makes the prestress tensioning member 2 have a force on the anchor seat 3, the force is a force in the direction of the middle part of the prestress tensioning member 2, that is, a force in the direction of the other anchor seat 3, that is, the force directions of the two anchor seats 3 are opposite, the force of the anchor seat 3 is transmitted to the bottom plate body 1, so that the bottom plate body 1 has a tendency to arch upward, or the bottom plate body 1 arches upward. In the embodiment, preferably, the bottom plate body 1 arches upward, so as to ensure that the bottom plate body 1 has sufficient structural rigidity and strength, and ensure the reliability and safety of the composite slab during construction. This mode is especially suitable for large-span composite floors. The bottom plate body 1 is preferably slightly arched, and the specific arching degree can be determined according to the span of the composite slab, and preferably, the arching height of the bottom plate body 1 is 1 / 1000-3 / 1000 of the full span length.

[0035] In one of the embodiments, as shown in Figures 1-3 , the prefabricated bottom plate further comprises a tensioning jack 4, the tensioning jack 4 is a bidirectional tensioning jack capable of bidirectional tensioning, the prestress tensioning member 2 comprises a first tensioning section 21 and a second tensioning section 22 which are respectively locked and connected with the two anchor seats 3, and the tensioning jack 4 is located between the two anchor seats 3 and is respectively in tensioning connection with the first tensioning section 21 and the second tensioning section 22. In this way, complex devices such as tensioning anchorage devices can be omitted, and the prestress is controllable, so that the process flexibility and reliability are high. For the detachable prestress unit, the tensioning jack 4 can obviously be reused.

[0036] In one of the embodiments, as shown in Figures 2-4 , the prestress unit has a plurality of prestress tensioning members 2 arranged side by side, the arrangement direction of each prestress tensioning member 2 is perpendicular to the tensioning member axial direction and parallel to the bottom surface of the bottom plate body 1, for example, arranged in sequence along the width direction of the bottom plate body 1. Using a plurality of prestress tensioning members 2 can make the bottom plate body 1 bear force uniformly and ensure the prestress application effect on the bottom plate body 1.

[0037] Preferably, a prestress inner tendon can also be arranged in the bottom plate body 1 in advance, after the above prestress unit is removed, the prestress inner tendon can still make the bottom plate body 1 have good structural rigidity and strength, and ensure the application effect of the composite slab. The prestress distribution of the prestress inner tendon and the prestress unit needs to be considered in coordination to avoid adversely affecting the structural performance of the bottom plate body 1.

[0038] Embodiment two

[0039] The embodiment of the utility model provides a kind of composite slab, including the prefabricated bottom plate provided in above-mentioned embodiment one, upper layer plate is formed on the bottom plate body 1 by cast-in-place.

[0040] Among them, for the case of prestressed unit disassembly, preferably, after the upper layer pouring is completed and the concrete strength reaches the requirement, the prestressed unit is disassembled.

[0041] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precast base plate for a laminated slab, characterized by: The prestressed unit is arranged on the bottom surface of the bottom plate body and comprises two anchor seats and at least one prestressed tension member.

2. A precast base panel for use in a composite panel according to claim 1, characterised in that: The bottom plate body is arched upward.

3. The pre-cast footing for a composite slab of claim 1, wherein: The two anchor seats are detachably connected with the bottom plate body.

4. The precast base panel for a composite panel according to claim 3, wherein: The anchor seats are detachably mounted on the bottom plate body through bolt assembly holes.

5. Prefabricated sole slab for laminated slabs according to any one of claims 1 to 4, characterized in that: The prestressed tension member is detachably connected with the anchor seats.

6. A precast base panel for use in a composite panel according to claim 5, characterised in that: The two ends of the prestressed tension member have threaded connection sections and are locked on the anchor seats through locking nuts screwed on the threaded connection sections.

7. The pre-cast footing for a composite slab of claim 1, wherein: The prestressed unit has a plurality of prestressed tension members arranged side by side, and the arrangement direction of each prestressed tension member is perpendicular to the axial direction of the tension member and parallel to the bottom surface of the bottom plate body.

8. The pre-cast footing for a composite slab of claim 1, wherein: The anchor seat is an L-shaped member comprising a first plate body in abutting connection with the bottom plate body and a second plate body in perpendicular connection with the first plate body, and the two ends of the prestressed tension member are locked with the two second plate bodies, respectively.

9. The pre-cast footing for a composite slab of claim 1, wherein: The prestressed unit has a plurality of prestressed tension members arranged side by side, and the arrangement direction of each prestressed tension member is perpendicular to the axial direction of the tension member and parallel to the bottom surface of the bottom plate body.

10. A laminated board, characterized by: The anchor seat is an L-shaped member comprising a first plate body in abutting connection with the bottom plate body and a second plate body in perpendicular connection with the first plate body, and the two ends of the prestressed tension member are locked with the two second plate bodies, respectively. The prestressed unit has a plurality of prestressed tension members arranged side by side, and the arrangement direction of each prestressed tension member is perpendicular to the axial direction of the tension member and parallel to the bottom surface of the bottom plate body. The anchor seat is an L-shaped member comprising a first plate body in abutting connection with the bottom plate body and a second plate body in perpendicular connection with the first plate body, and the two ends of the prestressed tension member are locked with the two second plate bodies, respectively.

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