Prestressed concrete truss laminated slab

Abstract

The utility model discloses a prestressed concrete truss laminated slab which comprises an upper chord member, a plurality of fixing frames are fixed to the lower portion of the upper chord member in the length direction of the upper chord member, and the bottoms of the fixing frames are embedded in a poured concrete bottom plate. The fixing frame comprises an X-shaped cross rod located at the bottom, two web bars composed of bent steel bars or alloy forgings are fixed to the cross rod, the bottoms of the web bars are fixed to two arms of the cross rod, and the tops of the web bars are fixed to the two sides of the lower portion of the upper chord. According to the utility model, the concrete bottom plate can be prevented from being damaged by a gripping device of hoisting equipment, and concrete at the two ends of the concrete bottom plate can be prevented from being broken or deformed when bearing the acting force of prestressed steel bars; and the thickness of the concrete bottom plate can be further reduced.

Description

Technical Field

[0001] The utility model relates to the field of composite slabs, in particular to a prestressed concrete truss composite slab. Background Art

[0002] In recent years, concrete truss composite slabs have been widely used in the construction industry. This product can reduce wet work steps during construction and the use of construction formwork and scaffolding, thereby reducing labor consumption, lowering construction difficulty, and improving construction efficiency. Existing concrete truss composite slabs are prefabricated with a truss consisting of an upper chord, webs, and lower chords. During the pouring of the concrete base slab, the lower chord and part of the webs are embedded in the concrete base slab to form the concrete truss composite slab. The lower chord also serves as the longitudinal internal reinforcement of the concrete base slab. Concrete truss composite slabs with this structure must ensure that the concrete base slab thickness is at least 60 mm. Otherwise, the base slab will warp and fail to meet the required rigidity requirements during construction. The thicker the concrete base slab, the greater its deadweight, which increases the deadweight of the entire building structure. This increases the volume of basic structural components such as beams, columns, and walls, reducing the utilization rate of the building's indoor area and the headroom. Furthermore, these concrete truss composite slabs have limited strength, are prone to cracking during transportation and installation, and have a high defective rate.

[0003] For this purpose, application number: CN201620264464.8 proposes a prestressed concrete truss composite plate to solve the above problems. However, the total weight of the metal parts required for the composite plate is relatively large, and the cost is significantly increased compared to the existing composite plates. Summary of the Invention

[0004] In order to increase the strength of the truss composite plate while reducing the weight of the metal materials used, the utility model proposes a prestressed concrete truss composite plate, the structure of which includes: an upper chord, a plurality of fixing frames fixed to the lower part of the upper chord along its length direction, and the bottom of the fixing frame is buried in the cast concrete base plate; the fixing frame includes an X-shaped cross bar at the bottom, and two webs composed of bent steel bars or alloy forgings are fixed on the cross bar, the bottom of the webs are fixed to the two arms of the cross bar, and the top of the webs are fixed to the two sides of the lower part of the upper chord; the four ends of the cross bar are also provided with upward or downward protrusions.

[0005] Preferably, it further comprises an inter-rod connector, which is X-shaped and has sleeves at its four ends. The sleeves are inserted into four inner convex columns of adjacent fixing frames, and the sleeves are fixed to the convex columns by welding.

[0006] Preferably, the portion of the inter-rod connector excluding the sleeve is a steel bar or an alloy forging.

[0007] Preferably, the diameters of the abdominal muscles and cross bars are equal.

[0008] Preferably, the bottoms of the cross rods are not on the same horizontal plane, and the bottoms of the inter-rod connecting members are also not on the same horizontal plane.

[0009] The utility model combines the cross rods and the web reinforcement to form a fixing frame, and fixes the adjacent fixing frames by rod-to-rod connectors, forming a net-like structure, which strengthens the bonding degree between the metal material below the web reinforcement and between the upper chord rods and the concrete. The utility model can prevent the grabbing device of the lifting equipment from damaging the concrete base plate, and can also prevent the concrete at both ends of the concrete base plate from being broken or deformed when subjected to the force of the prestressed steel bars, and can further reduce the thickness of the concrete base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is a three-dimensional diagram of the utility model.

[0012] Figure 2 Schematic diagram of the installation of the upper chord and the fixing bracket.

[0013] Figure 3 Schematic diagram of the inter-rod connector structure.

[0014] In the figure: 1, upper chord; 2, concrete base plate; 3, fixing frame; 4, inter-rod connector; 31, web reinforcement; 32, cross rod; 33, boss; 41, alloy forging; 42, sleeve. DETAILED DESCRIPTION

[0015] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0016] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0019] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0020] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. Example 1

[0021] like Figure 1-Figure 3 As shown, the prestressed concrete truss composite plate of the present invention has a structure comprising: an upper chord 1, a plurality of fixing frames 3 being fixed to the lower portion of the upper chord 1 along its length direction, the bottom of the fixing frames 3 being embedded in the cast concrete base plate 2; the fixing frames 3 comprising an X-shaped cross bar 32 at the bottom, two webs 31 consisting of bent steel bars being fixed on the cross bar 32, the bottom of the webs 31 being fixed to the two arms of the cross bar 32, and the top of the webs 31 being fixed to both sides of the lower portion of the upper chord 1; upward protrusions 33 are also provided at the four ends of the cross bar 32.

[0022] More specifically, it also includes an inter-rod connector 4, which is X-shaped, and has sleeves 42 at its four ends. The sleeves 42 are inserted into the four inner protrusions 33 of the adjacent fixing frame 3, as shown in FIG. Figure 1 As shown, the sleeve 42 is fixed to the boss 33 by welding.

[0023] More specifically, Figure 3 As shown, the portion of the inter-rod connecting member 4 excluding the sleeve 42 is an alloy forging 41 , which is in the shape of an X-shaped rod.

[0024] More specifically, the diameters of the web ribs 31 and the cross bars 32 are equal.

[0025] More specifically, the bottoms of the cross rods 32 are not on the same horizontal plane, and the bottoms of the inter-rod connectors 4 are also not on the same horizontal plane.

[0026] The utility model combines the cross rods and the web reinforcement to form a fixing frame, and fixes the adjacent fixing frames by rod-to-rod connectors, forming a net-like structure, which strengthens the bonding degree between the metal material below the web reinforcement and between the upper chord rods and the concrete. The utility model can prevent the grabbing device of the lifting equipment from damaging the concrete base plate, and can also prevent the concrete at both ends of the concrete base plate from being broken or deformed when subjected to the force of the prestressed steel bars, and can further reduce the thickness of the concrete base plate.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prestressed concrete truss composite slab, characterized by: include: The upper chord is fixed with several fixing brackets along its length at the lower part of the upper chord, and the bottom of the fixing bracket is buried in the cast concrete base plate; the fixing bracket includes an X-shaped cross bar at the bottom, and two webs made of bent steel bars or alloy forgings are fixed on the cross bar. The bottom of the webs is fixed to the two arms of the cross bar, and the top of the web is fixed to the two sides of the lower part of the upper chord; the four ends of the cross bar are also provided with upward or downward protrusions.

2. The prestressed concrete truss composite slab according to claim 1, characterized in that: It also includes an inter-rod connector, which is X-shaped and has sleeves at its four ends. The sleeves are inserted into four inner convex columns of adjacent fixing frames and are fixed to the convex columns by welding.

3. The prestressed concrete truss composite slab according to claim 2, characterized in that: The portion of the inter-rod connecting piece excluding the sleeve is a steel bar or an alloy forging.

4. The prestressed concrete truss composite slab according to claim 3, characterized in that: The diameters of the abdominal muscles and cross bars are equal.

5. The prestressed concrete truss composite slab according to claim 4, characterized in that: The bottoms of the cross rods are not on the same horizontal plane, and the bottoms of the inter-rod connectors are also not on the same horizontal plane.

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