Ultra-wide steel pipe truss prestressed concrete composite slab

Abstract

The utility model discloses a kind of super wide-width steel pipe truss prestressed concrete composite slabs, including prefabricated slab, several parallel prestressed reinforcement are embedded in the prefabricated slab;The upper surface of the prefabricated slab is fixedly provided with multiple parallel steel pipe link frames;The upper portion of the multiple steel pipe link frames is provided with a set of integral link assembly, the link assembly is fixedly connected with the upper chord of all steel pipe link frames, and the link assembly includes the fixedly connected connection reinforcement one and connection reinforcement two of each other crossing.The utility model applies pressure to tension adjusting reinforcement one and tension adjusting reinforcement two by threaded sleeve, so that active tension is formed to lower connection reinforcement network, the pre-tension is evenly transmitted to the upper chord of all steel pipe trusses by link assembly, significantly enhance the overall rigidity and bending performance of prefabricated slab in demoulding, transportation and hoisting process, effectively inhibit the bending deformation and cracking risk easily produced by super wide-width thin plate.

Description

Technical Field

[0001] This utility model relates to the technical field of prestressed concrete composite slabs, specifically an ultra-wide steel pipe truss prestressed concrete composite slab. Background Technology

[0002] The ultra-wide steel pipe truss prestressed concrete composite slab is a large-scale precast and cast-in-place composite floor slab manufactured using advanced technology. It consists of a prestressed concrete slab with a steel pipe truss prefabricated in a factory, transported to the construction site for installation, and then a layer of cast-in-place concrete is poured on top. The two are integrated into a whole through the steel pipe truss and the roughened surface, sharing the load. Chinese Patent No. CN202422389962.2 discloses a steel truss prestressed concrete composite slab, relating to the technical field of steel truss prestressed concrete composite slabs, specifically including a base slab, a positioning and casting layer slab, and a casting layer cover slab. An external handle is fixedly connected to the side of the pouring layer cover plate, and a positioning clip is fixedly connected to the bottom of the positioning pouring layer plate. A positioning groove is opened on the top of the base plate, and a locking groove is opened on the top of the positioning pouring layer plate. A positioning steel body is locked inside the locking groove. A fixing groove is opened at the bottom of the pouring layer cover plate. A steel truss is set on the top of the positioning pouring layer plate, and a composite plate is set inside the steel truss. A reinforcing rib is fixedly installed on the top of the composite plate. The positioning pouring layer plate and the positioning steel body facilitate installation and enhance the overall rigidity. The multi-layer composite plate and reinforcing rib effectively increase the stability during use.

[0003] Based on the above, the inventors have discovered the following problems: the above-mentioned device can effectively enhance the resistance strength of the composite slab during use; however, for ultra-wide steel pipe truss prestressed concrete composite slabs, their transportation and hoisting require higher requirements. Due to the characteristics of ultra-wide steel pipe truss prestressed concrete composite slabs such as large slab size, light weight, and high flexibility, they are extremely sensitive to the stress state during hoisting and transportation; if an unreasonable hoisting scheme is adopted, it will lead to excessive bending moment and shear force on the slab under its own weight. Utility Model Content

[0004] The purpose of this utility model is to provide an ultra-wide steel pipe truss prestressed concrete composite slab to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ultra-wide steel pipe truss prestressed concrete composite slab, comprising a precast slab, wherein a plurality of parallel prestressed steel bars are pre-embedded in the precast slab; a plurality of parallel steel pipe connecting frames are fixedly arranged on the upper surface of the precast slab; an integral connecting assembly is arranged above the plurality of steel pipe connecting frames, and the connecting assembly is fixedly connected to the upper chord of all the steel pipe connecting frames.

[0006] Furthermore, the connecting assembly includes a first connecting steel bar and a second connecting steel bar that are fixedly connected to each other at an intersection. Both the first connecting steel bar and the second connecting steel bar span across and are fixedly connected to the upper chord of the plurality of steel pipe connecting frames.

[0007] Furthermore, a tension adjusting rib is provided above the first connecting steel bar, and the two ends of the tension adjusting rib are fixedly connected to the two ends of the first connecting steel bar; a tension adjusting rib is provided above the second connecting steel bar, and the two ends of the tension adjusting rib are fixedly connected to the two ends of the second connecting steel bar; the tension adjusting rib and the tension adjusting rib are fixedly connected at the intersection point in the middle.

[0008] Furthermore, a screw is fixedly installed above the intersection of the first connecting steel bar and the second connecting steel bar; a through hole is opened at the intersection of the first tension adjusting steel bar and the second tension adjusting steel bar; and a threaded sleeve is provided on the screw bar as it passes upward through the through hole.

[0009] Furthermore, the tension adjusting rib one and tension adjusting rib two are arc-shaped steel bars, and their arching direction is away from the precast slab.

[0010] Furthermore, the tension adjusting rib two and the tension adjusting rib one are symmetrically provided with connecting rings on both sides of their upper ends.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the ultra-wide steel pipe truss prestressed concrete composite slab is reasonable and has the following advantages: (1) The unique adjustable tensioning mechanism effectively improves the workability; by tightening the threaded sleeve at the factory, downward pressure is applied to the arc-shaped tension adjustment bar one and tension adjustment bar two, causing them to undergo elastic deformation and forming an active tension force on the lower connecting steel reinforcement network. This pretension is evenly transmitted to the upper chord of all steel pipe trusses through the connecting components, which significantly enhances the overall rigidity and bending resistance of the precast slab during demolding, transportation and hoisting, effectively suppressing the bending deformation and cracking risk that ultra-wide thin plates are prone to, and ensuring the integrity of the components from the factory to the installation. (2) Safe and efficient construction operation was achieved through the integrated hoisting system. Multiple connecting rings set on both sides of the upper surface of the tension adjustment bar are directly connected to the integral connecting component, so that the concentrated force during hoisting is evenly distributed to all steel pipe trusses through the crisscrossing steel reinforcement network, which completely avoids the stress concentration problem caused by traditional hoisting methods. This integrated design not only ensures hoisting safety, but also eliminates the need for additional welding of hoisting points, simplifies the construction process, and improves installation efficiency. It is especially suitable for hoisting operations of ultra-large plates. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 This is a schematic diagram of part of the structure of this utility model; Figure 4 This utility model Figure 3 Schematic diagram of the exploded structure; Figure 5 This is an enlarged structural diagram of point A in this utility model; In the diagram: 1. Precast slab; 2. Steel pipe connecting frame; 3. Prestressed steel bar; 4. Connecting steel bar one; 5. Connecting steel bar two; 6. Tension adjusting bar one; 7. Tension adjusting bar two; 8. Threaded sleeve; 9. Through hole; 10. Screw; 11. Connecting ring. Detailed Implementation

[0013] 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 some embodiments of the present utility model, and not all 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.

[0014] Please see Figure 1-5 The present invention provides a technical solution as follows: Example: An ultra-wide steel pipe truss prestressed concrete composite slab includes a precast slab 1, in which several parallel prestressed steel bars 3 are pre-embedded; multiple parallel steel pipe connecting frames 2 are fixedly installed on the upper surface of the precast slab 1; an integral connecting assembly is installed above the multiple steel pipe connecting frames 2, and the connecting assembly is fixedly connected to the upper chord of all the steel pipe connecting frames 2.

[0015] The connecting component includes a first connecting steel bar 4 and a second connecting steel bar 5 that are fixedly connected to each other at an intersection. Both the first connecting steel bar 4 and the second connecting steel bar 5 span across and are fixedly connected to the upper chord of the plurality of steel pipe connecting frames 2.

[0016] Among them, a tension adjusting rib 6 is provided above the connecting steel bar 4, and the two ends of the tension adjusting rib 6 are fixedly connected to the two ends of the connecting steel bar 4; a tension adjusting rib 7 is provided above the connecting steel bar 5, and the two ends of the tension adjusting rib 7 are fixedly connected to the two ends of the connecting steel bar 5; the tension adjusting rib 6 and the tension adjusting rib 7 are fixedly connected at the intersection point in the middle.

[0017] A screw rod 10 is fixedly installed above the intersection of the first connecting steel bar 4 and the second connecting steel bar 5; a through hole 9 is opened at the intersection of the first tension adjusting bar 6 and the second tension adjusting bar 7; and a threaded sleeve 8 is provided on the screw rod 10 as it passes upward through the through hole 9.

[0018] Among them, tension adjusting rib 6 and tension adjusting rib 7 are arc-shaped steel bars, and their arching direction is away from the precast slab 1.

[0019] Among them, the tension adjusting rib 2 7 and the tension adjusting rib 1 6 are symmetrically provided with connecting rings 11 on both sides of the upper end.

[0020] Working principle: During use, tightening the threaded sleeve 8 applies downward pressure to tension adjusting rib 1 6 and tension adjusting rib 2 7. Since tension adjusting rib 1 6 and tension adjusting rib 2 7 are arc-shaped steel bars with fixed ends, this pressure causes them to undergo elastic deformation and form tension force on the connecting steel bar 1 4 and connecting steel bar 2 5 below. Then, through the connecting assembly, this pretension is transmitted to the upper chord of all steel pipe connecting frames 2, ultimately enhancing the overall rigidity and bending resistance of the entire precast slab 1 during transportation and hoisting, and preventing cracking. The connecting ring 11 is used to connect the hoisting equipment, so that the force during hoisting is evenly distributed through the entire connecting assembly, avoiding stress concentration.

[0021] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A prestressed concrete composite slab with an ultra-wide steel pipe truss, comprising a precast slab (1), characterized in that: The precast slab (1) is pre-embedded with several parallel prestressed steel bars (3); multiple parallel steel pipe connecting frames (2) are fixedly installed on the upper surface of the precast slab (1); an integral connecting assembly is installed above the multiple steel pipe connecting frames (2), and the connecting assembly is fixedly connected to the upper chord of all the steel pipe connecting frames (2).

2. The ultra-wide steel pipe truss prestressed concrete composite slab according to claim 1, characterized in that: The connecting assembly includes a first connecting steel bar (4) and a second connecting steel bar (5) that are fixedly connected to each other. Both the first connecting steel bar (4) and the second connecting steel bar (5) span across and are fixedly connected to the upper chord of the plurality of steel pipe connecting frames (2).

3. The ultra-wide steel pipe truss prestressed concrete composite slab according to claim 2, characterized in that: A tension adjusting rib (6) is provided above the first connecting steel bar (4), and the two ends of the tension adjusting rib (6) are fixedly connected to the two ends of the first connecting steel bar (4); a tension adjusting rib (7) is provided above the second connecting steel bar (5), and the two ends of the tension adjusting rib (7) are fixedly connected to the two ends of the second connecting steel bar (5); the tension adjusting rib (6) and the tension adjusting rib (7) are fixedly connected at the intersection point in the middle.

4. The ultra-wide steel pipe truss prestressed concrete composite slab according to claim 3, characterized in that: A screw (10) is fixedly installed above the intersection of the first connecting steel bar (4) and the second connecting steel bar (5); a through hole (9) is opened at the intersection of the first tension adjusting bar (6) and the second tension adjusting bar (7); the screw (10) passes upward through the through hole (9) and is provided with a threaded sleeve (8).

5. The ultra-wide steel pipe truss prestressed concrete composite slab according to claim 4, characterized in that: The tension adjusting rib one (6) and tension adjusting rib two (7) are arc-shaped steel bars, and their arching direction is away from the precast slab (1).

6. The ultra-wide steel pipe truss prestressed concrete composite slab according to claim 5, characterized in that: Both the upper ends of the tension adjusting rib 2 (7) and the tension adjusting rib 1 (6) are symmetrically provided with connecting rings (11).

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