Prestressed steel pipe truss concrete laminated slab

Abstract

The utility model provides a prestressed steel pipe truss concrete laminated slab, which relates to the technical field of building prefabricated components and comprises a plurality of groups of steel pipe trusses and a concrete prefabricated slab, the plurality of groups of steel pipe trusses are longitudinally arranged on the concrete prefabricated slab, and each group of steel pipe trusses comprises an upper chord steel pipe, two groups of web members and two reinforcing steel bars. The web members are in a wave shape, the two web members are arranged on the two sides of the upper chord steel pipe, the wave crest bending sections of the web members are welded to the upper chord steel pipe, the wave trough bending sections of the web members are embedded in the concrete prefabricated plate, and the two reinforcing steel bars are welded to the top and the bottom of the upper chord steel pipe in the length direction of the upper chord steel pipe. According to the prestressed steel pipe truss concrete laminated slab, the reinforcing steel bars are additionally arranged at the upper part and the lower part of the upper chord steel pipe, so that the flexural rigidity of the upper chord steel pipe is greatly enhanced, the arch camber of the laminated slab is favorably controlled, and grouting can be avoided and the manufacturing difficulty is reduced by adopting the laminated slab in the form.

Description

Technical Field

[0001] The utility model relates to the technical field of building precast components, in particular to a prestressed steel pipe truss concrete composite slab. Background Technique

[0002] In the field of building materials, concrete truss composite slabs are increasingly widely used in the construction industry. The existing concrete truss composite slabs mainly consist of a bottom slab and a truss, and the overall concrete truss composite slab is formed by pouring the bottom slab and the steel pipe truss.

[0003] For example, a steel pipe and steel bar combined truss with the Chinese patent publication number CN108643448A includes an upper chord pipe, and a web member is arranged on each side of the upper chord pipe in the length direction. Each of the two web members is formed by continuously bending a steel bar. The bending parts at the upper and lower ends of the web member are both arc-shaped, and the straight bar is between the arc-shaped bends at the upper and lower ends of the web member. The arc-shaped ends at the bending parts at the upper ends of the web members are respectively welded to the outer wall of the upper chord pipe through a first welding point and a second welding point at the junction with the straight bar.

[0004] The steel pipe truss concrete composite slab such as the above is a product improved from the steel bar truss concrete composite slab. In the truss, the upper chord steel bar is replaced by a steel pipe, and prestressed steel bars are used to replace the bottom steel bars, which improves the stiffness and reduces the mass.

[0005] However, the stiffness provided by using a steel pipe to replace the upper chord steel bar is limited. In the traditional method, if it is necessary to improve the stiffness of the steel pipe, grouting is required in the steel pipe. However, the grouting step is relatively cumbersome, and the grouting quality is difficult to guarantee, and quality problems such as incomplete grouting and air bubbles are likely to occur. Based on this, this case is born. Content of the Utility Model

[0006] (I) Technical Problems to be Solved

[0007] In view of the deficiencies of the prior art, the utility model provides a prestressed steel pipe truss concrete composite slab, which solves the problems put forward in the above background technique.

[0008] (II) Technical Solutions

[0009] To achieve the above purposes, the utility model is realized through the following technical solutions: a prestressed steel pipe truss concrete composite slab, including several groups of steel pipe trusses and a concrete precast slab. Several groups of steel pipe trusses are longitudinally arranged on the concrete precast slab. Each group of the steel pipe trusses includes an upper chord steel pipe, two groups of web members, and two reinforcing steel bars. The web members are in a wave shape. The two groups of web members are arranged on both sides of the upper chord steel pipe. The wave crest bending section of the web member is welded to the upper chord steel pipe, and the wave trough bending section of the web member is embedded in the concrete precast slab. The two reinforcing steel bars are welded to the top and bottom of the upper chord steel pipe along the length direction of the upper chord steel pipe.

[0010] Preferably, transverse prestressed steel bars and longitudinal prestressed steel bars are arranged in a crisscross pattern within the precast concrete slab, and are tied to each other at the intersections.

[0011] Preferably, longitudinal prestressed steel bars are arranged on both the upper and lower sides of the trough bending section of the web member.

[0012] Preferably, two groups of web members are inclined and arranged on both sides of the upper chord steel pipe, and the web members and the upper chord steel pipe form a triangular shape.

[0013] Preferably, a pair of U-shaped reinforcement bars are arranged in the precast concrete slab corresponding to the trough bending section of each group of web members. The two U-shaped reinforcement bars pass through the trough bending sections of the two web members relatively, and the ends of the pair of U-shaped reinforcement bars are contact-tied and lapped to form a ring.

[0014] Preferably, the sides of a pair of U-shaped reinforcement bars are tied to the longitudinal prestressed steel bars.

[0015] (III) Advantageous Effects

[0016] The present utility model provides a prestressed steel pipe truss concrete composite slab, which has the following advantageous effects:

[0017] 1. For this prestressed steel pipe truss concrete composite slab, by adding reinforcement bars at the upper and lower parts of the upper chord steel pipe, the flexural stiffness of the upper chord steel pipe is greatly enhanced, which is beneficial to controlling the camber of the composite slab. Using this form of composite slab can eliminate grouting and reduce the manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an isometric view of the present utility model;

[0019] Figure 2 is a side sectional schematic view of the present utility model;

[0020] Figure 3 is a front sectional view of the present utility model.

[0021] In the figures: 1 steel pipe truss, 2 precast concrete slab, 3 transverse prestressed steel bar, 4 longitudinal prestressed steel bar, 5 U-shaped reinforcement bar, 11 upper chord steel pipe, 12 web member, 13 reinforcement bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] An embodiment of the present utility model provides a prestressed steel pipe truss concrete composite slab, as Figures 1-3As shown in the figure, it includes several groups of steel pipe trusses 1 and precast concrete slabs 2. Several groups of steel pipe trusses 1 are longitudinally arranged on the precast concrete slabs 2. Each group of steel pipe trusses 1 includes upper chord steel pipes 11, two groups of web members 12 and two reinforcing bars 13. The web members 12 are wavy. The two groups of web members 12 are arranged on both sides of the upper chord steel pipes 11. The web members 12 are tangent to the upper chord steel pipes 11. The peak bending sections of the web members 12 are welded to the upper chord steel pipes 11, and the welding points are located on the upper and lower sides of the tangent points. The valley bending sections of the web members 12 are embedded in the precast concrete slabs 2. The two groups of web members 12 are inclined and arranged on both sides of the upper chord steel pipes 11, and the web members 12 and the upper chord steel pipes 11 form a triangular shape.

[0023] As Figure 2 shown, the two reinforcing bars 13 are welded to the top and bottom of the upper chord steel pipes 11 along the length direction of the upper chord steel pipes 11. By adding the reinforcing bars 13 at the upper and lower parts of the upper chord steel pipes 11, the bending stiffness of the upper chord steel pipes 11 is greatly enhanced, and it is beneficial to control the camber of the composite slab. Using this form, grouting can be omitted for composite slabs with a small span, reducing the manufacturing difficulty.

[0024] Transverse prestressed steel bars 3 and longitudinal prestressed steel bars 4 are arranged vertically and horizontally in the precast concrete slabs 2, and are tied to each other at the intersection points.

[0025] The longitudinal prestressed steel bars 4 can be arranged in two layers, and the two layers of longitudinal prestressed steel bars 4 are respectively arranged on the upper and lower sides of the valley bending sections of the web members 12. And the longitudinal prestressed steel bars 4 are welded to the web members 12 at the intersection of the valley bending sections, increasing the connection strength between the web members 12 and the precast concrete slabs 2.

[0026] As Figure 2 shown, a pair of U-shaped reinforcement bars 5 are arranged in the precast concrete slabs 2 corresponding to the valley bending sections of each group of web members 12. The U-shaped reinforcement bars 5 are arranged at intervals at the valley bending sections of several web members 12. The two U-shaped reinforcement bars 5 pass through the valley bending sections of the two web members 12 relatively. The upper and lower ends of the U-shaped reinforcement bars 5 are respectively located on the upper and lower sides of the valley bending sections of the web members 12. The ends of a pair of U-shaped reinforcement bars 5 are in contact with each other and are tied and lapped to form a ring. By arranging the U-shaped reinforcement bars 5, it helps to improve the connection strength between the web members 12 and the precast concrete slabs 2.

[0027] The sides of a pair of U-shaped reinforcement bars 5 are tied to the longitudinal prestressed steel bars 4. The steel pipe trusses 1 and the transverse prestressed steel bars 3 and longitudinal prestressed steel bars 4 in the precast concrete slabs 2 are tied together, mainly placed at the hoisting point strengthening parts, improving the hoisting point strength and ensuring the hoisting safety.

[0028] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A prestressed steel tube truss concrete composite slab, comprising a plurality of groups of steel tube trusses (1) and a concrete precast slab (2), wherein the plurality of groups of steel tube trusses (1) are longitudinally arranged on the concrete precast slab (2), characterized in that: Each group of the steel tube trusses (1) comprises an upper chord steel tube (11), two groups of web members (12) and two reinforcing steel bars (13); the web members (12) are wavy in shape; the two groups of web members (12) are arranged on both sides of the upper chord steel tube (11); the wave crest bending section of the web members (12) is welded to the upper chord steel tube (11); the wave trough bending section of the web members (12) is embedded in the concrete precast slab (2); and the two reinforcing steel bars (13) are welded to the top and bottom of the upper chord steel tube (11) along the length direction of the upper chord steel tube (11).

2. The prestressed steel tube truss concrete composite slab according to claim 1, characterized in that: The concrete precast slab (2) is provided with transverse prestressed steel bars (3) and longitudinal prestressed steel bars (4) arranged in a crisscross pattern, and the intersections are tied to each other.

3. The prestressed steel tube truss concrete composite slab according to claim 2, characterized in that: Longitudinal prestressed steel bars (4) are arranged on both upper and lower sides of the trough bending section of the web member (12).

4. The prestressed steel tube truss concrete composite slab according to claim 1, characterized in that: Two groups of web members (12) are obliquely arranged on both sides of the upper chord steel pipe (11), and the web members (12) and the upper chord steel pipe (11) are in a triangular shape.

5. The prestressed steel tube truss concrete composite slab according to claim 1, characterized in that: A pair of U-shaped reinforcing steel bars (5) are provided in the concrete precast slab (2) at the wave trough bending section corresponding to each group of web members (12); the two U-shaped reinforcing steel bars (5) pass through the wave trough bending sections of the two web members (12) in opposite directions; the ends of the pair of U-shaped reinforcing steel bars (5) are contacted, tied and overlapped to form a ring shape.

6. The prestressed steel tube truss concrete composite slab according to claim 5, characterized in that: The side portions of a pair of U-shaped reinforcing steel bars (5) are tied to the longitudinal prestressed steel bars (4).

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