Prefabricated steel pipe truss prestress laminated slab

Abstract

The utility model relates to the field, in particular to an assembly type steel pipe truss prestress laminated slab which comprises a concrete bottom slab, and transverse distribution bars and prestress longitudinal bars are embedded in the concrete bottom slab. Web member steel bars inclined relative to the concrete bottom plate are arranged on the two sides of the upper chord; the web member steel bars are of continuous wave-shaped structures, wave troughs of the web member steel bars are embedded in the concrete bottom plate, and wave crests of the web member steel bars are arranged on two sides of the upper chord; meanwhile, the wave trough embedded in the concrete bottom plate is of a horizontal straight line section structure. After the scheme is adopted, the anchoring strength of the truss and the bottom plate is increased, the overall strength is better, and meanwhile the stacking capacity can be improved.

Description

Technical Field

[0001] This utility model relates to a precast prestressed composite slab for steel pipe trusses. Background Technology

[0002] In the field of lightweight building materials technology, concrete truss composite slabs are increasingly widely used in the construction industry because they can reduce the amount of formwork and scaffolding required during construction, improve construction efficiency, and thus reduce construction costs. Existing concrete truss composite slabs mainly consist of a base slab and trusses, forming an integral concrete truss composite slab through the casting of the base slab and the steel pipe trusses.

[0003] Prior patent "CN115341705A" discloses a steel pipe truss concrete composite slab, which includes a reinforced concrete base slab and a steel pipe truss. Multiple longitudinal prestressed steel bars are arranged within the reinforced concrete base slab. The steel pipe truss includes steel pipes and corrugated steel bars welded to both sides of the steel pipes. The corrugated steel bars include crest sections, trough sections, and web members between the crest and trough sections. The troughs of the corrugated steel bars are embedded within the reinforced concrete base slab. Multiple transverse steel bars are arranged within the reinforced concrete base slab. The crests of the corrugated steel bars have welded joints to the steel pipes, and these welded joints are located at or near the tangent points where the corrugated steel bars intersect with the steel pipes. This design improves the overall structural stability of the steel pipe truss prestressed concrete composite slab.

[0004] However, in the above structure, the pressure of the corrugated web members (i.e., corrugated steel bars) in contact with the concrete is relatively high when the floor slabs are stacked, which can easily cause the concrete below the corrugated web members to crack. When the floor slab is lifted, the anchorage force may be insufficient due to the short length of the trough of the web members embedded in the concrete, which may also lead to cracking. In addition, there is still room for improvement in the structural stability.

[0005] Therefore, the inventors conducted further research and developed a precast steel pipe truss prestressed composite slab, which led to this invention. Utility Model Content

[0006] The purpose of this utility model is to provide a prestressed composite slab for prefabricated steel pipe trusses, which increases the anchorage strength between the truss and the base plate, resulting in better overall strength and improved stacking capacity.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A precast steel pipe truss prestressed composite slab, comprising

[0009] A concrete base slab, in which transverse distribution bars and prestressed longitudinal bars are embedded;

[0010] The top chord has web reinforcement bars on both sides that are inclined relative to the concrete base slab.

[0011] The web reinforcement is a continuous wavy structure, with its troughs embedded in the concrete base slab and its crests located on both sides of the upper chord.

[0012] Meanwhile, the troughs embedded in the concrete base slab are horizontal straight line segments.

[0013] Compared to existing technologies where the web reinforcement is almost vertically arranged, the web reinforcement in this design is inclined. Combined with the straight horizontal structure of its troughs, this increases the embedment length of the web reinforcement into the base slab concrete, thereby increasing the anchorage strength between the truss and the base slab, resulting in better overall integrity and reducing the likelihood of cracking during the lifting of the composite slab. The straight horizontal troughs themselves increase the contact area between the web reinforcement and the concrete base slab, thus reducing the pressure on the contact area between the web reinforcement and the concrete when the slabs are stacked, and improving stacking capacity.

[0014] Furthermore, the transverse distribution reinforcement is placed below the prestressed longitudinal reinforcement.

[0015] Placing the distribution bars below the prestressed longitudinal bars can better utilize the tensile strength of the steel bars, making the concrete slab bear the stress evenly and preventing the concrete at the ends of the composite slab from cracking.

[0016] Furthermore, the prestressed longitudinal reinforcement in the concrete base slab has an asymmetrical reinforcement structure, with the reinforcement length on one side being 130-170mm and the reinforcement length on the other side being 0-30mm.

[0017] The exposed length of the reinforcing bars refers to the length of the reinforcing bars relative to the outside of the concrete slab. Asymmetrical exposed reinforcing bar structures reduce the amount of reinforcing bars used, increase the convenience of later composite slab installation, reduce the probability of exposed reinforcing bars pricking construction workers during installation, and improve safety.

[0018] Furthermore, the edges of the concrete base slab are provided with tongue and groove joints, and one side of the tongue and groove joint is provided with a sealing structure.

[0019] This effectively increases the sealing between adjacent composite slabs, eliminating the need for sealing the joints between slabs during subsequent secondary pouring, thus improving construction efficiency and quality.

[0020] Furthermore, the upper chord is a steel round tube with a diameter of Φ20-Φ50mm and a wall thickness of 1-5mm, or a steel square tube with a side length of 20-50mm and a wall thickness of 1-5mm.

[0021] This method saves on steel usage without compromising the mechanical properties of the composite slab.

[0022] Furthermore, the upper chord is filled with UHPC material.

[0023] UHPC is short for Ultra-High Performance Concrete.

[0024] Furthermore, the joint between the two adjacent concrete base slabs is a beveled splice.

[0025] Angled joints can increase the adhesion of the bottom plaster, making the underlying mortar less likely to fall off.

[0026] Furthermore, the angle between the web reinforcement and the center plane of the top chord is in the range of 15°-60°.

[0027] Furthermore, the length of the horizontal straight segment of the trough is 3-10cm.

[0028] By adopting the above solution, this utility model has the following advantages compared with the prior art:

[0029] 1) Solved the problem of easy cracking of the concrete at both ends of ordinary prestressed precast composite slabs;

[0030] 2) It solves the problem that the truss and concrete base plate are prone to loosening and separation during the lifting process of ordinary prestressed precast composite slabs; at the same time, it increases the number of layers of finished composite slabs that can be stacked.

[0031] 3) The amount of steel reinforcement used in the composite slab is reduced without affecting performance, resulting in better economic efficiency;

[0032] 4) It solves the problem of sealing the joints of ordinary prestressed precast composite slabs before secondary pouring on the construction site to prevent grout leakage, thereby saving labor costs and improving construction efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the present invention;

[0034] Figure 2 This is a magnified view of a section of the truss;

[0035] Figure 3 This is a schematic diagram of the tongue-and-groove joint between two concrete base slabs;

[0036] Figure 4 This is a schematic diagram of the beveled joint between two concrete base slabs;

[0037] Label Explanation

[0038] Concrete base slab 1, transverse distribution reinforcement 11, prestressed longitudinal reinforcement 12

[0039] Web reinforcement 2, (web reinforcement) crest 21, (web reinforcement) trough 22,

[0040] 3. Upper chord rod, 4. Sealing strip, 5. Bevel. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 As shown, a precast steel pipe truss prestressed composite slab includes a concrete base slab 1, web reinforcement 2, and top chord 3. The concrete base slab 1 is embedded with transverse distribution bars 11 and prestressed longitudinal bars 12, which are distributed in a mesh pattern. The transverse distribution bars 11 are placed below the prestressed longitudinal bars 12, which can better exert the tensile strength of the steel bars, make the concrete floor slab uniformly stressed, and prevent the concrete at the end of the composite slab from cracking.

[0043] Meanwhile, the prestressed longitudinal reinforcement 12 has an asymmetrical outward reinforcement structure in the concrete base slab 1, so as to Figure 1 Taking the angle in the middle as an example, the length of the lower rib is 150mm and the length of the upper rib is 20mm.

[0044] like Figure 2 As shown, the web reinforcement 2 is located on both sides of the upper chord 3, with an inclination angle of 30° relative to the concrete base slab 1. The upper chord 3 is filled with UHPC, and the web reinforcement 2 is inclined relative to the concrete base slab 1. That is, the crests 21 of the web reinforcement connect to and support the upper chord 3, and the troughs 22 of the web reinforcement are horizontal straight segments with a length of 5cm. Some transverse distribution reinforcement 11 passes over the troughs 22. The horizontal straight troughs 22 themselves increase the contact area between the web reinforcement and the concrete base slab 1, thereby reducing the pressure on the contact part between the web reinforcement and the concrete when the floor slabs are stacked, and improving the stacking capacity.

[0045] like Figure 3 As shown, the edge of the concrete base slab 1 is provided with a tongue and groove, and two adjacent concrete base slabs 1 can form a tongue and groove. At the same time, a sealing strip 4 is provided in the tongue and groove, which effectively increases the sealing between adjacent composite slabs. In the later secondary pouring, the process of sealing the joint between the slabs can be eliminated, which improves the construction efficiency and construction quality.

[0046] like Figure 4 As shown, in this embodiment, the other structures are the same as described above, except that the splicing structure between two adjacent concrete base slabs 1 is a beveled splice. The bevel 5 can increase the adhesion of the bottom plaster, making the lower mortar less likely to fall off. Different splicing methods can be determined according to specific needs.

[0047] In the above embodiments, the upper chord 3 is made of steel round tube, but it is only a specific embodiment of this utility model. At the same time, all terms such as "upper", "lower", "left", "right", and "middle" involved in this utility model are for reference only and are not absolute limitations. Any non-substantial modifications made using this utility model shall be considered as acts that infringe on the protection scope of this utility model.

Claims

1. A fabricated steel pipe truss prestressed composite slab, characterized in that: include A concrete base slab, in which transverse distribution bars and prestressed longitudinal bars are embedded; The top chord has web reinforcement bars on both sides that are inclined relative to the concrete base slab. The web reinforcement is a continuous wavy structure, with its troughs embedded in the concrete base slab and its crests located on both sides of the upper chord. Meanwhile, the troughs embedded in the concrete base slab are horizontal straight line segments.

2. The prefabricated steel pipe truss prestressed composite slab according to claim 1, characterized in that: The transverse distribution reinforcement is placed below the prestressed longitudinal reinforcement.

3. The prefabricated steel pipe truss prestressed composite slab according to claim 1, characterized in that: The prestressed longitudinal reinforcement in the concrete base slab has an asymmetrical reinforcement structure, with the reinforcement length on one side being 130-170mm and the reinforcement length on the other side being 0-30mm.

4. The prefabricated steel pipe truss prestressed composite slab according to claim 1, characterized in that: The concrete base slab has tongue and groove joints at its edges, and one side of the tongue and groove joint is fitted with a sealing structure.

5. The prefabricated steel pipe truss prestressed composite slab according to claim 1, characterized in that: The upper chord is a steel round tube with a diameter of Φ20-Φ50mm and a wall thickness of 1-5mm, or a steel square tube with a side length of 20-50mm and a wall thickness of 1-5mm.

6. The prefabricated steel pipe truss prestressed composite slab of claim 1, wherein: The upper chord is filled with UHPC material.

7. The prestressed composite slab of precast steel pipe truss according to claim 1, characterized in that: The joint between the two adjacent concrete base slabs is a beveled splice.

8. The prefabricated steel pipe truss prestressed composite slab of claim 1, wherein: The angle between the web reinforcement and the center plane of the top chord is between 15° and 60°.

9. The prefabricated steel pipe truss prestressed composite slab of claim 1, wherein: The length of the horizontal straight segment of the trough is 3-10cm.

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