A heavy-duty precast composite slab

Abstract

This utility model relates to the field of precast composite slabs. Its purpose is to provide an ultra-heavy precast composite slab, comprising a composite slab body. Within the composite slab body, a reinforcing cage, several strip-shaped reinforcing trusses, and prestressed reinforcing bars are pre-embedded. The upper part of the reinforcing cage extends beyond the top surface of the composite slab body, with both ends of the extended portion pre-cast with concrete to form reinforcing beam ends, while the middle section of the extended portion forms a reinforcing beam casting area. The strip-shaped reinforcing trusses are located around the reinforcing beams, and their upper parts also extend beyond the top surface of the composite slab body. The prestressed reinforcing bars are located below the strip-shaped reinforcing trusses, with their ends extending beyond the left and right end faces of the composite slab body. This utility model possesses excellent structural rigidity, load-bearing capacity, and superior secondary bonding with cast-in-place concrete.

Description

Technical Field

[0001] This utility model relates to the field of composite slabs, specifically a heavy-duty precast composite slab. Background Technology

[0002] Heavy-duty precast composite slabs refer to precast composite slabs that are prefabricated in a factory and have a certain weight. Due to their good load-bearing capacity and structural stability, heavy-duty precast composite slabs are widely used in various construction projects.

[0003] However, traditional heavy-duty precast composite slabs often have some technical problems in the construction of buildings with large spans or high stiffness requirements. For example, the structural stiffness of heavy-duty precast composite slabs is insufficient, and the secondary bonding effect with cast-in-place concrete is poor. Utility Model Content

[0004] The purpose of this invention is to provide an ultra-heavy precast composite slab with good structural rigidity, load-bearing capacity, and excellent secondary bonding with cast-in-place concrete.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A heavy-duty precast composite slab includes a composite slab body, wherein a steel cage, several strip steel trusses and prestressed steel bars are pre-embedded in the composite slab body;

[0007] The upper part of the steel cage extends out of the top surface of the composite slab body. The left and right ends of the extension are pre-cast with concrete to form the ends of the reinforcing beam, while the middle section of the extension forms the waiting area for the reinforcing beam.

[0008] The strip steel truss is located around the reinforcing beam, and its upper part also extends out of the top surface of the composite slab body;

[0009] The prestressed steel bars are located below the strip steel truss, and the ends of the prestressed steel bars extend out of the left and right end faces of the composite slab body, respectively.

[0010] Compared with the prior art, the advantages of this utility model are:

[0011] 1. By pre-embedding a steel cage in the composite slab body and pre-casting concrete on the top of the steel cage to form the end of a reinforcing beam, the bending and shear resistance and overall stiffness of the composite slab body are improved.

[0012] 2. By setting up a waiting area for the reinforcing beam, the cast-in-place concrete can flow into the reinforcing cage of the waiting area for the reinforcing beam and bond with it during the secondary pouring of the composite slab, thereby improving the secondary bond strength between the composite slab and the cast-in-place concrete. Attached Figure Description

[0013] Figure 1This is a structural schematic diagram of an embodiment of an ultra-heavy precast composite slab of this utility model;

[0014] Figure 2 This is a front view of an embodiment of an ultra-heavy precast composite slab of this utility model;

[0015] Figure 3 This is a left view of an embodiment of an ultra-heavy precast composite slab of this utility model;

[0016] Figure 4 This is a simplified structural diagram of the strip steel truss of this utility model.

[0017] Labeling explanation: 1 Composite slab body, 2 Reinforcing beam, 201 Reinforcing cage, 3 Strip steel truss, 301 Top chord reinforcement, 302 Bottom chord reinforcement, 303 Truss web reinforcement, 4 Prestressed reinforcement. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0019] like Figure 1-4 The diagram shown is a schematic representation of an embodiment of a heavy-duty precast composite slab provided by this utility model.

[0020] A heavy-duty precast composite slab includes a composite slab body 1, wherein a steel cage 201, several strip steel trusses 3 and prestressed steel bars 4 are pre-embedded in the composite slab body 1.

[0021] The upper part of the steel cage 201 extends out of the top surface of the composite slab body 1. The left and right ends of the extension are pre-cast with concrete to form the ends of the reinforcing beam 2, while the middle section of the extension forms the waiting area for the reinforcing beam 2.

[0022] The reinforcing beam 2 should be cast using concrete of the same strength as the composite slab body 1, and the ends of the reinforcing beam 2 should be cast integrally with the composite slab body 1.

[0023] The steel cage 201 is made by binding together several strip steel bars and several stirrups. The stirrups are arranged at intervals on the left and right. In order to ensure smooth flow of the cast-in-place concrete during the secondary pouring, the spacing between the stirrups in the waiting area of ​​the reinforcing beam 2 is not less than 200mm.

[0024] The strip steel truss 3 is located around the reinforcing beam 2, and its upper part also extends out of the top surface of the composite slab body 1;

[0025] The prestressed steel bar 4 is located below the strip steel truss 3, and the ends of the prestressed steel bar 4 extend out of the left and right end faces of the composite slab body 1, respectively.

[0026] The steel reinforcement cage 201 extends to the left and right, and there are two of them, with the two steel reinforcement cages 201 spaced apart from each other.

[0027] The steel cage 201 extends to the left and right, and the strip steel truss 3 is arranged in parallel on the front and rear sides of the reinforcing beam 2.

[0028] The prestressed steel bars 4 are provided in multiples, and the multiple prestressed steel bars 4 are arranged at intervals.

[0029] The prestressed steel bar 4 has external threads at both ends so that multiple heavy precast composite slabs can be connected by steel bar sleeves.

[0030] The strip steel truss 3 includes an upper chord steel bar 301 and two lower chord steel bars 302 located below the upper chord steel bar 301. The two lower chord steel bars 302 are respectively located on the front and rear sides of the upper chord steel bar 301. Each lower chord steel bar 302 is connected to the upper chord steel bar 301 by a wavy truss web bar 303.

[0031] The contact points between the truss web reinforcement 303 and the upper chord reinforcement 301 and the lower chord reinforcement 302 are all fixed by welding.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A superheavy prefabricated laminated slab comprising a laminated slab body (1), characterized in that: The composite slab body (1) is pre-embedded with a steel cage (201), several strip steel trusses (3) and prestressed steel bars (4); The upper part of the steel cage (201) extends out to the top surface of the composite slab body (1). The left and right ends of the extension are pre-cast with concrete to form the ends of the reinforcing beam (2), while the middle section of the extension forms the waiting area for the reinforcing beam (2). The strip steel truss (3) is located around the reinforcing beam (2), and its upper part also extends out of the top surface of the composite slab body (1); The prestressed steel bars (4) are located below the strip steel truss (3), and the ends of the prestressed steel bars (4) extend out of the left and right end faces of the composite slab body (1).

2. The superheavy precast composite slab as claimed in claim 1, wherein: The steel reinforcement cage (201) extends to the left and right, and there are two of them, with the two steel reinforcement cages (201) spaced apart from each other.

3. The heavy-duty precast composite slab according to claim 1, characterized in that: The steel cage (201) extends to the left and right, and the strip steel truss (3) is arranged in parallel on the front and rear sides of the reinforcing beam (2).

4. The heavy-duty precast composite slab according to claim 1, characterized in that: The prestressed steel bars (4) are provided in multiple strands, and the multiple prestressed steel bars (4) are arranged at intervals.

5. The heavy-duty precast composite slab according to any one of claims 1-4, characterized in that: The strip steel truss (3) includes an upper chord steel bar (301) and two lower chord steel bars (302) located below the upper chord steel bar (301). The two lower chord steel bars (302) are respectively located on the front and rear sides of the upper chord steel bar (301). Each lower chord steel bar (302) is connected to the upper chord steel bar (301) by a wavy truss web bar (303).

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