Novel-type laminated prefabricated slab and supporting structure using prefabricated slab

Abstract

The utility model discloses a new type laminated precast slab which comprises a precast slab body, a plurality of stiffening ribs which are arranged in parallel along the length direction of the precast slab body are arranged on the top surface of the precast slab body, and the stiffening ribs are high-strength concrete stiffening ribs. The utility model further discloses a supporting structure. According to the utility model, the UHPC (high-strength concrete) concrete is adopted as the prefabricated slab of the laminated slab floor slab, the rigidity is high, the self weight is light, a template with higher rigidity can be manufactured without using more reinforcing steel bars, and the prefabricated slab can be widely applied to building components.

Description

Technical Field

[0001] This utility model relates to the field of building components, and in particular to a new type of composite precast slab and a supporting structure using the precast slab. Background Technology

[0002] All existing precast slab products have drawbacks. One type is the commonly used precast concrete composite slab, which is 60mm thick in precast form and 70mm thick in cast-in-place. It is too heavy. When there are embedded pipelines crossing, the 70mm cast-in-place layer cannot cover the pipelines, resulting in the floor slab being too thick. During the assembly process, it is often necessary to locally smooth the surface to match the original design thickness, which wastes materials, increases the load, and is also detrimental to the overall structure.

[0003] Another type is steel truss floor decking. The steel truss is not for load-bearing purposes, but to meet the self-stiffness requirements of the unsupported structure. It has a high steel content and is expensive.

[0004] In response to the above situation, the national standard drawing set (21CG54) uses cement fiberboard as the bottom formwork. This bottom formwork is removable, has a thickness of 12-14mm, and is not part of the structural floor slab; it is merely used as a template. Because the bottom slab is not removed, the thickness of the structural floor slab is increased.

[0005] The "Technical Specification for the Application of High-Performance Fine Aggregate Concrete Reinforced Truss Composite Structure" being drafted by Xi'an University of Architecture and Technology uses reinforced trusses to provide bending stiffness, which undoubtedly increases the cost. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the above-mentioned background technology and provide a new type of composite precast slab and a supporting structure using the precast slab, which uses UHPC (high-strength concrete) as the precast slab of the composite floor slab, has high rigidity and light weight, and can produce a formwork with high rigidity without using a lot of steel bars.

[0007] This utility model provides a new type of composite precast slab, including a precast slab body, the top surface of which is provided with a plurality of stiffening ribs arranged parallel to each other along its length direction, the stiffening ribs being high-strength concrete stiffening ribs.

[0008] In the above technical solution, the high-strength concrete stiffening rib is composed of a rectangular strip web and a flange plate located at the top of the web, and the overall cross-section of the high-strength concrete stiffening rib is a "T" shaped structure.

[0009] In the above technical solution, the high-strength concrete stiffening rib includes a rectangular strip-shaped web, and a flange plate is provided at the top of the web plate. The flange plate has a structure that is wider in the middle and narrower at both ends.

[0010] In the above technical solution, the width of the flange plate is set at an angle from the middle to both ends.

[0011] In the above technical solution, the flange plate has a structure with a high middle and low ends, and the flange plate is set at an angle from the middle to the two ends.

[0012] In the above technical solution, the upper part of the web is evenly distributed with multiple steel bar openings, and the lower part of the web is evenly distributed with multiple pipeline openings, and the multiple steel bar openings and multiple pipeline openings are arranged in an alternating manner.

[0013] In the above technical solution, the high-strength concrete stiffening rib is a fiber-reinforced concrete stiffening rib or a structural steel wire stiffening rib.

[0014] In the above technical solution, the high-strength concrete stiffening rib is a rectangular stiffening rib.

[0015] This utility model also discloses a support structure that uses a new type of composite precast slab and includes beams or walls. The bottom ends of the precast slab body are respectively fixed between two beams or walls that are arranged opposite each other, and the high-strength concrete stiffening ribs are arranged facing upwards.

[0016] The novel composite precast slab and the supporting structure using the precast slab of this utility model have the following beneficial effects:

[0017] This invention utilizes the inherent characteristics of UHPC concrete: high tensile strength (easily achievable within 10MPa), high modulus of elasticity, and excellent stability. The resulting precast composite slabs exhibit high rigidity, allowing them to span conventional spans and making them suitable for office buildings. It effectively reduces the use of bamboo plywood, resulting in a green, energy-saving, and low-carbon solution.

[0018] Moreover, the precast slab of this utility model, as part of the floor slab, bears the construction load during the construction stage, and can serve as a protective layer for the floor slab, and naturally becomes part of the composite slab after the pouring is completed.

[0019] In this invention, UHPC concrete itself provides flexural stiffness, requires very little steel reinforcement, and after mass production, the cost is lower than that of the former. Attached Figure Description

[0020] Figure 1 This is a perspective view of the overall structure of the new type of composite precast slab of this utility model;

[0021] Figure 2 This is a top view of the overall structure of the new type of composite precast slab of this utility model;

[0022] Figure 3 This is a side structural elevation view of the new type of composite precast slab of this utility model;

[0023] Figure 4 This is a cross-sectional view of the cross section of the composite precast slab of the new type of this utility model;

[0024] Figure 5 This is a cross-sectional view of the end section of the new type of composite precast slab of this utility model;

[0025] Figure 6 This is a schematic diagram of the overall structure of the support structure for the new type of composite precast slab used in this utility model. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but these embodiments should not be construed as limiting the present invention.

[0027] See Figures 1 to 5 The new type of composite precast slab of this utility model includes a precast slab body 1. The top surface of the precast slab body 1 is provided with a plurality of stiffening ribs arranged parallel to its length direction. The stiffening ribs are high-strength concrete stiffening ribs 2.

[0028] In the first embodiment, the high-strength concrete stiffening rib 2 is composed of a rectangular strip web 21 and a flange 22 located at the top of the web 21, and the overall cross-section of the high-strength concrete stiffening rib 2 is a "T" shaped structure.

[0029] In the second embodiment, the high-strength concrete stiffening rib 2 includes a rectangular strip web 21, and a flange 22 is provided at the top of the web 21. The flange 22 has a structure that is wider in the middle and narrower at both ends. In one or more embodiments, the flange 22 is inclined from the middle to both ends.

[0030] Of course, there can be variations in this embodiment, namely, the height of the flange plate 22 is high in the middle and low at both ends, and the height of the flange plate 22 is set at an angle from the middle to both ends.

[0031] The upper part of the web 21 has multiple steel bar openings 23, and the lower part of the web 21 has multiple pipeline openings 24. The steel bar openings 23 and the pipeline openings 24 are arranged in an alternating pattern.

[0032] The high-strength concrete stiffening rib 2 is a fiber-reinforced concrete stiffening rib or a structural steel wire stiffening rib.

[0033] In the third embodiment, the high-strength concrete stiffening rib 2 is a rectangular stiffening rib.

[0034] See Figure 6The support structure of this utility model uses the aforementioned new type of composite precast slab. The bottom ends of the precast slab body 1 of the new type of composite precast slab are respectively fixed between two opposing beams 3 or walls, and the high-strength concrete stiffening ribs 2 are arranged facing upwards.

[0035] Technical features of this utility model:

[0036] 1) The stiffening ribs of the composite precast slab of this utility model are made of UHPC, i.e. high-strength concrete. Fiber-reinforced concrete or other reinforced concrete can be used as load-bearing components during construction. High-strength concrete requires very little reinforcement, only 5mm diameter structural steel wire is needed, or fiber can be added.

[0037] 2) Based on the requirements for reinforcing bar placement, the flange plates 22 of the high-strength concrete stiffening ribs 2 at both ends of the composite precast slab were reduced in size. This reduction allows for more cast-in-place concrete to bond with the reinforcing bars. Depending on the span, the height of this flange can also be reduced to create more cast-in-place sections, increasing overall integrity.

[0038] 3) To accommodate the arrangement of reinforcing bars (not shown in the figure) perpendicular to the direction of the precast composite slab and pipelines (not shown in the figure), reinforcing bar openings 23 and pipeline openings 24 are provided. The location of the reinforcing bar openings 23 accurately positions the reinforcing bars. The spacing of the reinforcing bar openings 23 can also be adjusted according to different loads. The spacing between the pipeline openings 24 can also be adjusted according to the actual project. Specific implementation examples:

[0040] The precast slab body 1 typically has a width of 600, 800, 900, or 1200 mm and a thickness of 15 mm, forming a flat plate that serves as the lower protective layer for the floor slab (not shown in the figure). T-shaped high-strength concrete stiffeners 2 are installed on top of this plate, with spacing calculated, typically 200-300 mm. The flange plate 22 of the T-shaped high-strength concrete stiffeners 2 has a thickness of 15 mm and serves as the upper protective layer for the floor slab. For smaller spans, rectangular stiffeners can also be used, retaining only the rebar openings 23 and pipeline openings 24. After the composite precast slab is fabricated, it serves as a formwork support between two corresponding beams 3 or walls (not shown in the figure), employing a partial support construction method. The web 21 of the composite precast slab has multiple rebar openings 23 and pipeline openings 24 to facilitate rebar tying. In this embodiment, the composite precast slab has a span of 4.2 m and a width of 900 mm.

[0041] This invention utilizes software simulation calculations, and its compressive, tensile, and shear strength indicators are all within the conventional range of UHPC. This UHPC is applicable to the engineering examples disclosed in this embodiment.

[0042] Details to note when implementing this embodiment:

[0043] 1) The opening in the web 21 meets the requirements for the placement of reinforcing bars and the passage of pipelines. It can also be opened at a non-perpendicular angle to the web 21 to facilitate the passage of pipelines. The pipeline opening 24 can be set separately from the reinforcing bar opening 23 or together.

[0044] 2) The precast slab body 1 and the flange plate 22 may or may not be chamfered. The purpose of chamfering is to allow for more cast-in-place concrete at the joint.

[0045] This utility model uses precast composite panels that are closely joined together to form an integral template. According to calculations, only supports are needed at both ends, or no supports are needed in the middle.

[0046] After the pouring is completed, the composite precast slab serves as the height control line for the floor slab, which can control the construction error of the floor slab within the range allowed by the specifications, ensuring that it is neither too thick nor too thin.

[0047] Compared with the closest technology, the advantages and functions of this utility model are as follows:

[0048] 1) The precast slab of this utility model does not require a lot of steel bars or steel trusses. It uses UHPC material, which can be used as a formwork in the construction stage and form an integral floor slab with the subsequent concrete pouring.

[0049] 2) The formwork height, i.e. the floor slab thickness, can be used as a height standard to control the elevation during pouring, ensuring that the deviation of the floor slab thickness is very small.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0051] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A new type of composite precast slab comprising a precast slab body (1), characterized in that: The top surface of the precast slab body (1) is provided with a plurality of stiffening ribs arranged parallel to its length direction. The stiffening ribs are high-strength concrete stiffening ribs (2). The high-strength concrete stiffening ribs (2) are composed of a rectangular strip web (21) and a flange plate (22) located at the top of the web (21). The overall cross section of the high-strength concrete stiffening ribs (2) is a "T" shaped structure. The high-strength concrete stiffening ribs (2) include a rectangular strip web (21). The top of the web (21) is provided with a flange plate (22). The width of the flange plate (22) presents a structure that is wider in the middle and smaller at both ends.

2. The new type of composite precast slab according to claim 1, characterized in that: The flange (22) is set at an angle from the middle to both ends.

3. The new type of composite precast slab according to claim 2, characterized in that: The flange plate (22) has a structure that is high in the middle and low at both ends, and the flange plate (22) is set at an angle from the middle to both ends.

4. The new type of composite precast slab according to claim 3, characterized in that: The upper part of the web (21) is evenly distributed with multiple steel bar openings (23), and the lower part of the web (21) is evenly distributed with multiple pipeline openings (24). The multiple steel bar openings (23) and the multiple pipeline openings (24) are arranged in an alternating manner.

5. The new type of composite precast slab according to claim 4, characterized in that: The high-strength concrete stiffening rib (2) is a fiber-reinforced concrete stiffening rib or a structural steel wire stiffening rib.

6. The new type of composite precast slab according to claim 5, characterized in that: The high-strength concrete stiffening rib (2) is a rectangular stiffening rib.

7. A support structure using the new type of composite precast slab as claimed in any one of claims 1 to 6, characterized in that: It also includes beams (3) or walls, with the bottom ends of the precast slab body (1) fixed between two opposing beams (3) or walls, and the high-strength concrete stiffening ribs (2) facing upwards.

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