Hollow prefabricated concrete ribbed beam prestressed hollow laminated slab

Abstract

The utility model discloses a hollow prefabricated concrete ribbed beam prestressed hollow laminated slab, which belongs to the technical field of constructional engineering and comprises a hollow prefabricated concrete ribbed beam prestressed bottom plate and a cast-in-place layer, and the bottom plate comprises a bound reinforcing mesh and a hollow prefabricated concrete ribbed beam arranged on the reinforcing mesh. Cylinder core inner molds are arranged on the two sides of the prefabricated ribbed beam in the plate length direction, a prefabricated bottom plate concrete layer with a certain height is poured on the lower portion of the reinforcing mesh and the lower portion of the hollow prefabricated concrete ribbed beam, a concrete solid is poured on the hollow prefabricated concrete ribbed beam prestressed bottom plate, and the cylinder core inner molds are embedded in the concrete solid. On the premise that the weight of the laminated slab is reduced, the integrity and the structural performance can be effectively guaranteed, the laminated slab can be used for a large-span structure, and the production cost is reduced to a certain extent.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, specifically relating to a hollow precast concrete ribbed prestressed hollow composite slab. Background Technology

[0002] Composite slabs are floor slabs made by stacking a precast base slab and a cast-in-place concrete layer. They are suitable for various prefabricated building applications. Most of the precast slabs are solid slabs formed in one piece. To expand their application range, give full play to the material properties of prestressed steel bars and high-strength concrete, and avoid the disadvantages of increased self-weight and poor economic indicators after the floor slab span is increased, the technical characteristics of composite floor slabs and cast-in-place hollow floor slabs can be combined.

[0003] For structures with large spans, a large overall weight of composite slabs can easily reduce the load-bearing capacity of the structural floor slabs, increase the risk of floor slab deformation and cracking, and adversely affect the seismic resistance of the structure. How to effectively ensure the overall strength and structural performance while reducing the weight of composite slabs is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hollow precast concrete ribbed prestressed hollow composite slab that can effectively ensure integrity and structural performance while reducing the weight of the composite slab. It can be used for large-span structures and reduces production costs to a certain extent.

[0005] This utility model provides the following technical solution: a hollow precast concrete ribbed prestressed hollow composite slab, including longitudinal prestressing tendons of the bottom slab, transverse reinforcing bars of the bottom slab, hollow precast concrete ribs, longitudinal stressed prestressing tendons, transverse anchoring reinforcing bars, lifting rings, precast bottom slab concrete layer, core inner mold, and cast-in-place concrete layer on the upper part of the composite slab.

[0006] The longitudinal prestressed tendons and transverse reinforcing bars of the base slab are tied together with reinforcing wire to form a horizontal reinforcing mesh; the hollow precast concrete rib beams are set on the horizontal reinforcing mesh, and the horizontal reinforcing mesh and the lower part of the hollow precast concrete rib beams are filled with concrete of a certain thickness to form a precast base slab concrete layer.

[0007] The hollow precast concrete rib beam has a core mold of the same length as the precast base slab concrete layer placed on both sides, and a certain height of concrete is poured to form the upper cast-in-place concrete layer of the composite slab.

[0008] The hollow precast concrete rib beam has a rectangular cross-section containing a circle. Two longitudinal prestressing tendons are provided on the top side, and lifting rings are provided at the three equal division points of the top side. The longitudinal prestressing tendons and lifting rings are fixed by binding wire. Two longitudinal prestressing tendons are provided on the bottom side, and transverse anchoring steel bars are provided on them. The longitudinal prestressing tendons and transverse anchoring steel bars are fixed by binding wire. The longitudinal prestressing tendons extend a certain length from each end face of the hollow precast concrete rib beam, and the transverse anchoring steel bars extend a certain length from each side of the outer facade of the hollow precast concrete rib beam.

[0009] Preferably, the transverse reinforcing bars of the base plate are arranged at equal intervals above the longitudinal prestressing tendons of the base plate, with a distance greater than or equal to 200mm.

[0010] Preferably, the center of the hollow precast concrete rib beam section is located at the geometric center of the rectangle, and the edge of the circle is at least 20mm away from the long side of the rectangle.

[0011] Preferably, the longitudinal length of the hollow precast concrete rib beam is the same as the length of the precast base slab concrete layer, and the length of the longitudinal prestressing tendon is the same as the length of the longitudinal prestressing tendon of the base slab.

[0012] Preferably, the longitudinal prestressing tendons in the hollow precast concrete rib beam are at least 10 mm away from the side profile of the hollow precast concrete rib beam.

[0013] Preferably, the longitudinal prestressing tendons in the hollow precast concrete rib beam are at least 10 mm away from the bottom surface of the hollow precast concrete rib beam.

[0014] The beneficial effects of this utility model are as follows: This utility model is equipped with hollow precast concrete rib beams and steel mesh for reducing overall weight and material usage. The hollow precast concrete rib beams are equipped with longitudinal prestressing tendons to improve strength, transverse anchoring steel bars, and lifting rings for easy hoisting. The steel mesh is equipped with longitudinal prestressing tendons and transverse steel bars to improve strength. The cast-in-place layer has core molds on both sides of the hollow precast concrete rib beams. Combining the technical characteristics of composite slabs and cast-in-place hollow floor slabs, it can effectively ensure overall strength and structural performance while reducing the weight of composite slabs. It can be used for large-span structures, avoids material waste, and reduces production costs to a certain extent. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the hollow precast concrete rib beam of this utility model;

[0018] Figure 4 This is a plan view of the present invention;

[0019] Figure 5 This is a cross-sectional view of the present invention.

[0020] In the figure, 1-longitudinal prestressing tendon of the base slab; 2-transverse reinforcement of the base slab; 3-hollow precast concrete rib beam; 4-longitudinal prestressing tendon; 5-transverse anchoring reinforcement; 6-lifting ring; 7-precast base slab concrete layer; 8-core inner mold; 9-cast-in-place concrete layer on the upper part of the composite slab. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-5 As shown, a hollow precast concrete ribbed prestressed hollow composite slab includes: 1. longitudinal prestressing tendons of the bottom slab, 2. transverse reinforcing bars of the bottom slab, 3. hollow precast concrete ribs, 4. longitudinal prestressing tendons, 5. transverse anchoring bars, 6. lifting rings, 7. precast bottom slab concrete layer, 8. core inner mold, and 9. cast-in-place concrete layer on the upper part of the composite slab.

[0023] The longitudinal prestressed tendons 1 and the transverse reinforcing bars 2 of the base plate are tied together by reinforcing bar ties to form a horizontal reinforcing bar mesh; the hollow precast concrete rib beam 3 is set on the horizontal reinforcing bar mesh, and the horizontal reinforcing bar mesh and the lower part of the hollow precast concrete rib beam 3 are filled with concrete of a certain thickness to form a precast base plate concrete layer 7.

[0024] The hollow precast concrete rib beam 3 has a core inner mold 8 of the same length as the precast base slab concrete layer 7 placed on both sides, and concrete of a certain height is poured to form the upper cast-in-place concrete layer 9 of the composite slab.

[0025] The hollow precast concrete rib beam 3 has a rectangular cross-section containing a circle. Two longitudinal prestressing tendons 4 are provided on the top side, and lifting rings 6 are provided at the three equal division points of the top side. The longitudinal prestressing tendons 4 and the lifting rings 6 are fixed by binding wire. Two longitudinal prestressing tendons 4 are provided on the bottom side, and transverse anchoring steel bars 5 are provided on them. The longitudinal prestressing tendons 4 and the transverse anchoring steel bars 5 are fixed by binding wire. The longitudinal prestressing tendons 4 extend a certain length from each end face of the hollow precast concrete rib beam 3, and the transverse anchoring steel bars 5 extend a certain length from each side of the outer facade of the hollow precast concrete rib beam 3.

[0026] The transverse anchoring steel bars 5 are equidistantly arranged above the longitudinal prestressing tendons 4 on the bottom side, with a distance greater than or equal to 200 mm. The center of the cross-section of the hollow precast concrete rib beam 3 is located at the geometric center of the rectangle, and the edge of the circle is greater than or equal to 20 mm from the long side of the rectangle. The longitudinal length of the hollow precast concrete rib beam 3 is equal to the length of the precast base slab concrete layer 9, and the length of the longitudinal prestressing tendon 4 is equal to the length of the longitudinal prestressing tendon 1 of the base slab. The longitudinal prestressing tendon 4 in the hollow precast concrete rib beam 3 is greater than or equal to 10 mm from the side elevation of the hollow precast concrete rib beam 3. The longitudinal prestressing tendon 4 in the hollow precast concrete rib beam 3 is greater than or equal to 10 mm from the bottom surface of the hollow precast concrete rib beam 3.

[0027] A method for manufacturing a hollow precast concrete ribbed prestressed hollow composite slab includes the following steps:

[0028] Step 1: Install the mold for casting hollow precast concrete ribs and the tensioning table for tensioning prestressing tendons on the mold platform, and apply release agent.

[0029] Step 2: Place the longitudinal prestressing tendons of the hollow precast concrete rib beam, which have been processed according to the design dimensions, into the mold for casting the hollow precast concrete rib beam.

[0030] Step 3: After tensioning is completed, the transverse anchoring steel bars of the hollow precast concrete rib beam, which have been processed according to the design dimensions, are tied and fixed to the longitudinal reinforcing steel bars on the bottom side of the hollow precast concrete rib beam using steel bar ties.

[0031] Step 4: Tie the lifting rings of the hollow precast concrete rib beam, which have been processed according to the design dimensions, to the longitudinal reinforcing bars on the top side of the hollow precast concrete rib beam at the three equal division points using steel wire.

[0032] Step 5: Fix the airbag in the mold, pour concrete and vibrate it. The upper surface of the hollow precast concrete rib beam should be roughened before the concrete sets.

[0033] Step 6: After the concrete has initially set, deflate the airbag and pull it out.

[0034] Step 7: Demold the concrete when it has cured to the point where the concrete strength meets the requirements for demolding and hoisting.

[0035] Step 8: Install the mold and tensioning table for casting the hollow precast concrete ribbed prestressed base plate on the mold platform, and apply the release agent.

[0036] Step 9: After the longitudinal prestressing tendons of the base slab are tensioned, place the transverse reinforcing bars of the base slab on top and fix them by binding wire.

[0037] Step 10: Hoist the demolded hollow precast concrete rib beams to the top of the precast base plate mold and place them on the corresponding horizontal reinforcing bars of the base plate.

[0038] Step 11: Pour the precast base slab concrete layer and vibrate it to form a precast base slab. The upper surface of the precast base slab should be roughened before the concrete sets.

[0039] Step 12: Once the concrete has reached the required strength for demolding, demold it and transport it outside the production workshop for further curing.

[0040] Step fourteen: Place the inner mold of the core on both sides of the hollow precast concrete rib beam, pour the upper layer of cast-in-place concrete of the composite slab and vibrate it to form the composite slab structure. The upper surface of the composite slab should be smoothed.

[0041] The specific embodiments described above further illustrate the purpose and technical solution of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hollow precast concrete ribbed prestressed hollow composite slab, characterized in that: This includes longitudinal prestressed tendons of the base slab, transverse reinforcing bars of the base slab, hollow precast concrete ribs, longitudinal prestressed tendons, transverse anchoring bars, lifting rings, precast base slab concrete layer, core inner formwork, and cast-in-place concrete layer on top of the composite slab. The longitudinal prestressed tendons and transverse reinforcing bars of the base slab are tied together with reinforcing wire to form a horizontal reinforcing mesh; the hollow precast concrete rib beams are set on the horizontal reinforcing mesh, and the horizontal reinforcing mesh and the lower part of the hollow precast concrete rib beams are poured with concrete to form a precast base slab concrete layer. The hollow precast concrete rib beam has a core mold of the same length as the precast base slab concrete layer placed on both sides, and concrete is poured on it to form the upper cast-in-place concrete layer of the composite slab. The hollow precast concrete rib beam has a rectangular cross-section containing a circle. Two longitudinal prestressing tendons are provided on the top side, and lifting rings are provided at the three equal division points of the top side. The longitudinal prestressing tendons and the lifting rings are fixed by binding wire. Two longitudinal prestressing tendons are provided on the bottom side, and transverse anchoring steel bars are provided on them. The longitudinal prestressing tendons and the transverse anchoring steel bars are fixed by binding wire. The longitudinal prestressing tendons extend out of both ends of the hollow precast concrete rib beam, and the transverse anchoring steel bars extend out of both sides of the outer facade of the hollow precast concrete rib beam.

2. The hollow precast concrete ribbed prestressed hollow composite slab according to claim 1, characterized in that: The transverse reinforcing bars of the base slab are equidistantly arranged above the longitudinal prestressing tendons of the base slab, with a distance of ≥200mm.

3. A hollow precast concrete ribbed prestressed hollow composite slab according to claim 2, characterized in that: The center of the hollow precast concrete rib beam section is located at the geometric center of the rectangle, and the edge of the circle is at least 20mm away from the long side of the rectangle.

4. A hollow precast concrete ribbed prestressed hollow composite slab according to claim 3, characterized in that: The longitudinal length of the hollow precast concrete rib beam is the same as the length of the precast base slab concrete layer, and the length of the longitudinal prestressing tendon is the same as the length of the longitudinal prestressing tendon of the base slab.

5. A hollow precast concrete ribbed prestressed hollow composite slab according to claim 4, characterized in that: The longitudinal prestressing tendons in the hollow precast concrete rib beam are at least 10 mm away from the side profile of the hollow precast concrete rib beam.

6. A hollow precast concrete ribbed prestressed hollow composite slab according to claim 5, characterized in that: The longitudinal prestressing tendons in the hollow precast concrete rib beam are at least 10 mm away from the bottom surface of the hollow precast concrete rib beam.

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