Steel bar truss unit and prefabricated floor support plate thereof

Abstract

The utility model provides a steel bar truss unit and a prefabricated floor support plate thereof, and belongs to the technical field of building floor slabs. Each steel bar truss unit comprises two upper chord steel bars, two lower chord steel bars, a web bar A and a web bar B, and the web bar A and the web bar B intersect with each other to form an X shape. The prefabricated floor support plate comprises a bottom plate and a plurality of steel bar truss units. All layers of steel bars are connected through the web bars to form a steel bar truss unit with a stable structure, the strength is high, stress can be effectively transmitted and dispersed, and the deformation resistance of the floor support plate is enhanced. The floor support plate forms an overall stress structure under the action of the steel bar truss units, all the structures cooperate with one another to bear various loads of a building in the using process, and damage caused by partial independent deformation is reduced. And the lightweight concrete layer has the characteristics of heat preservation, sound insulation and light weight, so that the floor support plate is convenient to transport and construct.

Description

Technical Field

[0001] This utility model relates to a steel truss unit and its precast floor deck, belonging to the field of building floor technology. Background Technology

[0002] The steel truss and base slab are prefabricated and connected in the factory to form a precast floor deck. During construction, the precast floor deck can be used as a formwork that does not need to be removed, making installation convenient, significantly shortening the construction cycle, reducing on-site wet work, lowering construction costs, and reducing construction waste. This aligns with the concept of green building development and is suitable for various building types, including residential, commercial, and industrial buildings. Traditional steel trusses are mostly constructed by welding together one top chord, two bottom chords, and web reinforcement, and their structural strength and load-bearing capacity need optimization and improvement. Traditional precast floor decks suffer from drawbacks such as heavy base slab weight, lack of structural insulation and sound insulation, and limited performance characteristics. This invention aims to provide a novel steel truss unit and its precast floor deck. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a steel truss unit and its precast floor slab, which integrates lightweight concrete and a specially designed steel truss unit, resulting in high structural stability, improved seismic performance, and the dual goals of enhanced thermal insulation and sound insulation performance and reduced floor slab weight.

[0004] This utility model achieves the above objectives by adopting the following technical solutions:

[0005] On the one hand, this utility model provides a steel truss unit, including two upper chord steel bars, two lower chord steel bars, and web bars A and web bars B. Both web bars A and web bars B are bent into a wave-shaped structure, and the wave-shaped structure has multiple peaks and troughs.

[0006] Abdominal tendons A and B intersect each other in an X shape, with the intersection line parallel to the wave direction line of the wavy structure;

[0007] The crests of the web reinforcement A and web reinforcement B are fixedly connected to two upper chord steel bars, respectively, and the troughs of the web reinforcement A and web reinforcement B are fixedly connected to two lower chord steel bars, respectively.

[0008] Furthermore, the steel truss unit provided by this utility model also includes a central steel bar, which is arranged parallel above or below the intersection line, and the web reinforcement A and web reinforcement B are fixedly connected to the central steel bar at the parts near the intersection line.

[0009] Specifically, the crests of abdominal fascia A and abdominal fascia B are staggered or correspond to each other along the wave direction.

[0010] Furthermore, in the direction perpendicular to the wave line, the distance between two upper chord bars is greater than, equal to, or less than the distance between two lower chord bars.

[0011] Furthermore, the two upper chord bars and the two lower chord bars are connected by transverse bars.

[0012] Specifically, the transverse reinforcing bars are made of steel bars bent into a wavy structure, and two upper chord reinforcing bars or two lower chord reinforcing bars are fixedly connected to the crest and trough of the wavy structure, respectively.

[0013] Alternatively, the transverse reinforcement may be made of multiple segments of straight reinforcement.

[0014] On the other hand, this utility model provides a precast floor deck, including a base plate and a plurality of steel truss units, wherein the lower part of the steel truss unit is embedded in the base plate, the upper part of the steel truss unit is exposed above the base plate, and the distance between the bottom surface of the steel truss unit and the bottom surface of the base plate is D.

[0015] Furthermore, the bottom of the steel truss unit is supported by pads.

[0016] Furthermore, the base plate includes a lightweight concrete layer, which is formed by curing lightweight concrete slurry, and the lightweight concrete is foamed concrete or lightweight aggregate concrete.

[0017] When applied to composite slabs, a conventional concrete layer is also provided on top of or at the bottom of the lightweight concrete layer.

[0018] The beneficial effects of this utility model include, but are not limited to:

[0019] The steel truss unit provided by this utility model connects the steel bars of each layer through web reinforcement to form a structurally stable steel truss unit with high strength. It can effectively transfer and disperse stress and enhance the deformation resistance of the floor deck.

[0020] The precast floor deck provided by this utility model integrates lightweight concrete and specially designed steel truss units. After the cast-in-place layer is constructed on the precast floor deck, the floor deck forms an integral load-bearing structure under the action of the steel truss units. The various structures work together to bear various loads during the use of the building, reducing damage caused by independent deformation of parts. The lightweight concrete layer has the characteristics of heat insulation, sound insulation, and light weight, which facilitates the transportation and construction of the floor deck.

[0021] Steel truss units can take various shapes, including those with equal width at the top and bottom, wider at the top and narrower at the bottom, or narrower at the top and wider at the bottom. Steel truss units with a wider top and narrower bottom offer advantages in resisting the swaying and deformation of the superstructure. Those with a narrower top and wider bottom facilitate better transfer of superstructure loads to the substructure, enhancing overall structural stability. Steel truss units with equal width at the top and bottom provide stable support while better adapting to both horizontal and vertical seismic forces. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a structural schematic diagram of one of the steel truss units provided in Examples 1 and 2;

[0024] Figure 2 This is a structural schematic diagram of another steel truss unit provided in Examples 1 and 2;

[0025] Figure 3 This is a structural schematic diagram of the steel truss unit provided in Example 3;

[0026] Figure 4 Side view of the steel truss unit as seen from one longitudinal end;

[0027] Figure 5 This is a three-dimensional structural diagram of the truss plate;

[0028] Figure 6 This is a side view of the truss plate;

[0029] Figure 7 This is a schematic diagram of the pad block structure;

[0030] Figure 8 This is a schematic diagram showing the pads placed at the bottom of the steel truss unit;

[0031] Figure 9 This is a schematic diagram of the three-dimensional structure of the composite plate;

[0032] Figure 10 This is a side view of a composite plate of one of the structures;

[0033] Figure 11 A side view of a composite plate with another structure;

[0034] In the diagram, 100 is the top chord reinforcement; 200 is the bottom chord reinforcement; 310 is the web reinforcement A; 320 is the web reinforcement B; 301 is the crest of the wave; 302 is the trough of the wave; 400 is the middle reinforcement; 500 is the transverse reinforcement; 600 is the bottom slab; 610 is the lightweight concrete layer; 620 is the ordinary concrete layer; and 700 is the spacer block. Detailed Implementation

[0035] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0036] It should be noted that many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below. Example 1

[0037] like Figure 1 and Figure 2 As shown, the steel truss unit provided in this embodiment includes two top chord steel bars 100, two bottom chord steel bars 200, and web reinforcement A 310 and web reinforcement B 320. The top chord steel bars 100 and bottom chord steel bars 200 are parallel to each other. Web reinforcement A 310 and web reinforcement B 320 are both bent into a wavy structure, as detailed in the reference. Figure 1 The web reinforcement A 310 and web reinforcement B 320 bend along plane A and plane B respectively. The wave-shaped structure has multiple crests and troughs. The wave direction line indicates the propagation direction of the wave-shaped structure and is parallel to the upper chord reinforcement 100 and the lower chord reinforcement 200. The length direction of the upper chord reinforcement 100 or the lower chord reinforcement 200 is the longitudinal direction of the steel truss unit.

[0038] Abdominal tendons A 310 and B 320 intersect each other in an X shape, with the intersection line parallel to the wave direction line of the wavy structure.

[0039] The crests 301 of the web reinforcement A 310 and web reinforcement B 320 are fixedly connected to the two upper chord reinforcements 100 respectively, and the troughs 302 of the web reinforcement A 310 and web reinforcement B 320 are fixedly connected to the two lower chord reinforcements 200 respectively, usually by welding.

[0040] refer to Figure 1 In one specific embodiment, the crest portion 301 of the abdominal rib A 310 and the crest portion 301 of the abdominal rib B 320 may correspond to each other along the wave direction. (See reference) Figure 2 In another specific embodiment, the crest portion 301 of the abdominal ligament A 310 and the crest portion 301 of the abdominal ligament B 320 are staggered along the wave direction.

[0041] The web reinforcement A 310 and web reinforcement B 320 can be obtained by conventional methods in the art. Typically, the diameter of the top chord reinforcement 100 and the bottom chord reinforcement 200 is 6-12 mm, and the diameter of the web reinforcement is 4-8 mm. Example 2

[0042] The difference between this embodiment and embodiment 1 is that the steel truss unit provided in this embodiment also includes a central steel bar 400, which is arranged parallel above or below the intersection line, and the web reinforcement A 310 and web reinforcement B 320 are fixedly connected to the central steel bar 400 near the intersection line. Example 3

[0043] like Figure 3 As shown, the difference between this embodiment and embodiments 1 and 2 is that the steel truss unit provided in this embodiment connects the two upper chord steel bars 100 and the two lower chord steel bars 200 respectively through transverse steel bars 500.

[0044] Specifically, in one embodiment, the transverse reinforcing bar 500 is a reinforcing bar bent into a wavy structure, and two upper chord reinforcing bars 100 or two lower chord reinforcing bars 200 are fixedly connected to the crest and trough of the wavy structure, respectively.

[0045] Alternatively, in another specific embodiment, the transverse reinforcement 500 adopts a multi-segment straight reinforcement structure.

[0046] This invention connects the steel bars of each layer through the web reinforcement to form a structurally stable steel truss unit with high strength, which can effectively transfer and disperse stress and enhance the deformation resistance of the floor deck.

[0047] In embodiments 1-3 above, in the direction perpendicular to the wave line, the distance between two upper chord steel bars 100 is greater than, equal to, or less than the distance between two lower chord steel bars 200, causing the steel truss unit to exhibit a specific shape that is wider at the top and narrower at the bottom, equal in width at both the top and bottom, or narrower at the top and wider at the bottom. Specifically, as follows... Figure 4 As shown in (a), the use of steel truss units that are wider at the top and narrower at the bottom has certain advantages in resisting the swaying and deformation of the superstructure (referring to the superstructure above the floor slab and building components located above the floor slab). Figure 4 As shown in (b), using steel truss units that are narrower at the top and wider at the bottom helps to better transfer the upper load (referring to the gravity of the upper structure of the floor slab and various loads applied to the floor slab) to the lower structure (referring to the structure below the floor slab) through walls, columns, beams, etc., thus enhancing the overall structural stability. Using steel truss units with equal width at the top and bottom provides stable support while better adapting to horizontal and vertical seismic forces.

[0048] In practical applications, the above three types of steel truss units can be used simultaneously in precast floor decks, so that steel truss units of different shapes can work together to improve the seismic performance of the floor decks. Example 4

[0049] like Figures 5-8 As shown in the figure, the precast floor deck provided in this embodiment includes a base plate 600 and several steel truss units as described in the above embodiment, with each steel truss unit arranged in parallel at intervals.

[0050] The lower part of the steel truss unit is embedded in the base slab 600, specifically the lower chord steel bar 200 and the lower part of the web reinforcement are embedded in the base slab 600. The upper part of the steel truss unit is exposed above the base slab 600, specifically the middle steel bar 400, the upper chord steel bar 100 and the upper part of the web reinforcement are exposed above the base slab 600.

[0051] The distance between the bottom surface of the steel truss unit and the bottom surface of the base plate 600 is D. In order to maintain this distance D, a pad 700 can be supported at the bottom of the steel truss unit. A groove is provided on the top of the pad 700 for the lower chord steel bars to be inserted.

[0052] In actual production, cement blocks 700 are evenly supported at the bottom of the two lower chord steel bars 200 respectively, so that the lower chord steel bars 200 and the bottom surface of the mold form a gap D. The required thickness of slurry is poured into the mold. After the slurry solidifies and forms the precast floor deck, the lower chord steel bars 200 are prevented from being exposed on the surface.

[0053] Furthermore, in this utility model, the base plate 600 preferably adopts a lightweight concrete layer 610. Lightweight concrete is a type of concrete with low density. It is mainly formed by using lightweight porous aggregates such as ceramsite and shale, or by adding air-entraining agents and foaming agents to form a porous structure. The pores significantly improve the thermal insulation and sound insulation effect of the precast floor deck, and also reduce the weight of the precast floor deck, making it easy to handle and install during the construction process.

[0054] Specifically, the lightweight concrete layer 610 is formed by the curing of lightweight concrete slurry, and the lightweight concrete is either foamed concrete or lightweight aggregate concrete. The steel truss unit provided by this utility model can be applied to truss panels (…). Figures 5-8 ) and composite slabs ( Figures 9-11 The composite slab is surrounded by lapped steel bars, and the bottom plate of the composite slab is 600mm thicker than the truss plate.

[0055] When applied to truss slabs, the prefabricated thickness of the base plate 600 is 20-30mm; when applied to composite slabs, the prefabricated thickness of the base plate 600 is not less than 60mm, and the specific thickness is adjusted according to the structural span.

[0056] like Figure 10 and Figure 11As shown, when applied to composite slabs, a regular concrete layer 620 is also provided on top or at the bottom of the lightweight concrete layer 610. The regular concrete layer 620 can use the same concrete as the post-cast layer on the base slab 600, further improving the load-bearing capacity of the base slab 600, effectively resisting various loads during construction and use, and ensuring the structural integrity of the composite slab in complex environments. Regular concrete is mainly composed of basic elements such as cement, sand, stone, and water.

[0057] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A steel truss unit, characterized in that, It includes two upper chord steel bars, two lower chord steel bars, and web bars A and B. Both web bars A and B are bent into a wavy structure with multiple peaks and troughs. Abdominal tendons A and B intersect each other in an X shape, with the intersection line parallel to the wave direction line of the wavy structure; The crests of the web reinforcement A and web reinforcement B are fixedly connected to two upper chord steel bars, respectively, and the troughs of the web reinforcement A and web reinforcement B are fixedly connected to two lower chord steel bars, respectively.

2. The steel truss unit according to claim 1, characterized in that, It also includes a central reinforcing bar, which is arranged parallel to the cross line above or below it, and the web reinforcement A and web reinforcement B are fixedly connected to the central reinforcing bar near the cross line.

3. The steel truss unit according to claim 1, characterized in that, The crests of abdominal fascia A and abdominal fascia B are either staggered or correspond to each other along the wave direction.

4. The steel truss unit according to claim 1, characterized in that, In the direction perpendicular to the wave line, the distance between two upper chord bars is greater than, equal to, or less than the distance between two lower chord bars.

5. The steel truss unit according to claim 1, characterized in that, The two top chord bars and the two bottom chord bars are connected by transverse bars.

6. The steel truss unit according to claim 5, characterized in that, The transverse reinforcing bars are made of steel bars bent into a wavy structure, and two upper chord steel bars or two lower chord steel bars are fixedly connected to the crest and trough of the wavy structure, respectively. Alternatively, the transverse reinforcement may be made of multiple segments of straight reinforcement.

7. A precast floor deck, characterized in that, It includes a base plate and several steel truss units as described in any one of claims 1-6, wherein the lower part of the steel truss unit is embedded in the base plate, the upper part of the steel truss unit is exposed above the base plate, and the distance between the bottom surface of the steel truss unit and the bottom surface of the base plate is D.

8. The precast floor decking according to claim 7, characterized in that, The bottom of the steel truss unit is supported by pads.

9. The precast floor decking according to claim 7, characterized in that, The base plate includes a lightweight concrete layer, which is formed by curing lightweight concrete slurry. The lightweight concrete is either foamed concrete or lightweight aggregate concrete.

10. The precast floor decking according to claim 9, characterized in that, A conventional concrete layer is also provided on top of or at the bottom of the lightweight concrete layer.

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