Prefabricated laminated slab and vacancy filling structure between laminated slab and beam

Abstract

The utility model relates to the technical field of assembly type building construction, in particular to the technology of steel truss threshold value laminated slabs, in particular to a prefabricated laminated slab and a vacancy filling structure between the laminated slab and a beam, which comprises a prefabricated bottom plate and a plurality of steel pipe web member trusses installed on the prefabricated bottom plate. The steel pipe web member truss is composed of web members with wave-shaped sections and main rods connected with the tops of the web members, and a plurality of prestressed tendons parallel to the wave-shaped web members and a plurality of constructional steel bars perpendicular to the wave-shaped web members are pre-buried in the prefabricated bottom plate. The constructional steel bars are arranged at the connecting positions of the wave troughs of every two adjacent wave-shaped web members and located between the wave-shaped web members and the prestressed tendons. Compared with the prior art, the structure has the advantages that good anti-shearing force performance is achieved between the cast-in-place layer and the prefabricated layer, gaps among the supporting wall, the supporting column and the prefabricated laminated slab are filled more firmly, and the crack problem of the prefabricated laminated slab can be better controlled.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building construction technology, and in particular to the technology of steel truss threshold composite slabs. Specifically, it is a prefabricated composite slab and a gap-filling structure between the composite slab and the beam. Background Technology

[0002] Traditional floor slab construction requires on-site formwork erection, rebar tying, and concrete pouring, which suffers from technical drawbacks such as long construction cycles, high formwork wastage rates, and poor quality stability. It is particularly vulnerable to weather conditions during high-altitude operations, making it difficult to meet the efficiency and quality control requirements of industrialized construction.

[0003] With the development of science and technology, prefabricated modular buildings have been proposed. For example, existing technologies involve prefabricating perforated concrete slabs in factories for on-site assembly. Although this allows for rapid installation, its unidirectional stress characteristics result in insufficient overall structural integrity. Cracks are prone to occur at the joints between slabs, and bidirectional force transfer cannot be achieved, leading to inherent defects in seismic performance.

[0004] Furthermore, a composite slab construction method combining a precast concrete base slab with a cast-in-place concrete layer has been proposed in this field. Although the integrity is improved by the post-cast layer, the shear strength of the interface between the precast and cast-in-place layers is insufficient, posing a risk of delamination at the interface. Consequently, the resulting interface slippage is significant, severely affecting the structural performance.

[0005] Therefore, there is an urgent need to design a precast composite slab and a gap-filling structure between the composite slab and the beam to solve the problems of shear resistance, crack control, and connection stability between the precast layer and the cast-in-place layer in the prior art. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a precast composite slab and a gap-filling structure between the composite slab and the beam, so as to overcome the problems of shear resistance between the precast layer and the cast-in-place layer, crack control, and connection stability between the precast layer and the on-site supporting beam or supporting wall.

[0007] To achieve the above objectives, a precast composite slab is designed, comprising a precast base slab and several steel pipe web trusses installed on the precast base slab. The steel pipe web trusses are composed of web members with a corrugated cross section and main members connected to their tops. Several prestressing tendons parallel to the direction of the corrugated web members and several structural steel bars perpendicular to the direction of the corrugated web members are pre-embedded in the precast base slab. The structural steel bars are set at the connection of the troughs of two adjacent corrugated web members and are located between the corrugated web members and the prestressing tendons.

[0008] Preferably, the present invention further includes: at least three structural steel bars on both sides of the precast base plate, all of which are on the same horizontal plane and located at the bottom of the prestressing tendons.

[0009] Preferably, the present invention further includes: the upper surface of the precast base plate is used to support a number of bottom reinforcement bars laid on site, the bottom reinforcement bars laid on site being perpendicular to the direction of the corrugated web members.

[0010] This utility model also provides a gap-filling structure between the precast composite slab and the beam, wherein a plurality of gap-filling bottom reinforcement bars parallel to the corrugated web members are provided in the gap-filling area between the composite slab and the beam, and the gap-filling bottom reinforcement bars are closely connected to and located below the bottom reinforcement bars laid on site perpendicular to the direction of the corrugated web members.

[0011] Compared with the prior art, the advantages of this utility model are:

[0012] It has good shear resistance between the cast-in-place layer and the precast layer, and more firmly fills the gap between the supporting wall, supporting column and precast composite slab, which can better control the cracking problem of the precast composite slab. Attached Figure Description

[0013] Figure 1 This is a top perspective view of the composite plate of this utility model;

[0014] Figure 2 This is a front perspective view of the composite plate of this utility model;

[0015] Figure 3 This is a front view of the gap-filling structure of this utility model;

[0016] Figure 4 This is a top view of the gap-filling structure of this utility model;

[0017] Figure 5 This is a partial schematic diagram of the gap-filling structure of this utility model;

[0018] In the diagram: 1. Precast base slab, 2. Steel pipe web truss, 2-1 web member, 2-2 main member, 3. Prestressed tendon, 4. Structural reinforcement, 5. Bottom reinforcement, 6. Filling gap bottom reinforcement, 7. Top reinforcement, 8. Top reinforcement, 9. Concrete rib, 10. C-shaped steel edging, 11. Scaffolding, 12. Support beam, 13. Filling gap. Detailed Implementation

[0019] To make the purpose, principle and structure of this utility model clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] See Figures 1 to 5 This utility model provides a prefabricated composite slab and a gap-filling structure between the composite slab and the beam.

[0021] Example 1: This example provides a prefabricated composite slab.

[0022] The composite slab includes a precast base slab 1, on which a steel pipe web truss 2 is installed. The steel pipe web truss 2 includes several wavy web members 2-1 and main members 2-2 located at the top of the wavy web members 2-1. The web members 2-1 have several continuous wavy bends, and the troughs of the web members 2-1 are connected in the precast base slab 1 and fixed by casting, welding, or binding. The crests of the web members 2-1 are connected to the main members 2-2.

[0023] Several prestressed tendons 3 are pre-embedded in the precast base plate 1, which are parallel to the extension direction of the corrugated web members 2-1, and several structural steel bars 4 are perpendicular to the direction of the corrugated web members 2-1. The structural steel bars 4 are arranged at the trough connection of two adjacent corrugated web members 2-1 and are located between the corrugated web members 2-1 and the prestressed tendons 3.

[0024] At least three structural steel bars 4 are provided on both sides of the precast base plate 1. The structural steel bars 4 are set at the bottom of the prestressing tendons 3. The structural steel bars 4 can be cast and fixed in the precast base plate 1, or they can be fixedly connected to the prestressing tendons 3 by binding, snapping, welding or other methods.

[0025] Several bottom reinforcement bars 5 are also laid on the upper surface of the precast base plate 1. The bottom reinforcement bars 5 are laid on site and are arranged along the direction perpendicular to the corrugated web bar 2-1.

[0026] The top of the steel pipe web truss 2 is also provided with a concrete rib 9. Inside the concrete rib 9, there is a top rib 7 set at the top of the main member 2-2 along the direction parallel to the web member 2-1. The top of the concrete rib 9 is also surrounded by a C-shaped steel edging 10.

[0027] Example 2: A gap-filling structure between the composite slab and the beam using the prefabricated composite slab as described in Example 1.

[0028] There is a gap 13 between the composite slab and the precast supporting beam 12 or supporting wall. Several bottom reinforcing bars 6 are provided at the gap 13 along a direction parallel to the corrugated web members 2-1. These bottom reinforcing bars 6 are fixedly connected to the bottom reinforcing bars 5 laid perpendicular to the corrugated web members 2-1 by welding, snap-fitting, or binding. The bottom reinforcing bars 5 are also fixedly connected to the precast base slab 1 and the corrugated web members 2-1 by welding, snap-fitting, or binding. A mesh-like steel reinforcement structure is formed in the gap 13 between the composite slab and the supporting wall or supporting beam 12. By using a formwork supported by scaffolding 11 at the bottom of the gap 13, stable casting of the gap can be achieved, forming a stable and firm gap-filling structure between the precast composite slab and the supporting beam 12.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and novel concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A prefabricated composite slab, comprising a prefabricated bottom plate and a plurality of steel pipe web truss girders mounted on the prefabricated bottom plate, the steel pipe web truss girders being composed of a web with a wavy cross section and a main rod connected to the top of the web, characterized in that: a plurality of prestressed tendons parallel to the direction of the wavy web are embedded in the prefabricated bottom plate, and a plurality of constructional steels perpendicular to the direction of the wavy web are embedded in the prefabricated bottom plate; the constructional steels are arranged at the connection between two adjacent wave troughs of the wavy web and between the wavy web and the prestressed tendons; at least three constructional steels are arranged on both sides of the prefabricated bottom plate, all the constructional steels are in the same horizontal plane and are located at the bottom of the prestressed tendons; the upper surface of the prefabricated bottom plate is used to support a plurality of field-laid bottom tendons, the field-laid bottom tendons are perpendicular to the direction of the wavy web; a plurality of emptying bottom tendons parallel to the wavy web are arranged in the emptying area between the composite slab and the beam, the emptying bottom tendons are closely connected with and located below the field-laid bottom tendons perpendicular to the direction of the wavy web. ​ ​ 2. A precast sandwich panel as claimed in claim 1, wherein, ​ 3. A precast sandwich panel as claimed in claim 1 wherein, ​ 4. A structure for filling the gap between the laminated slab and the beam using the prefabricated laminated slab according to claim 3, characterized in that, ​

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