A precast concrete composite slab unit

Abstract

A kind of pre-mixed concrete composite slab component belongs to concrete composite slab production technical field, to the problem of traditional steel mould heavy, easy to wear and long maintenance cycle, component includes bottom plate and four L type side plates, bottom plate bottom is equipped with grid frame to enhance bearing capacity, top is equipped with positioning bolt and side plate positioning hole cooperation to realize accurate assembly;L type side plate outer wall is equipped with triangular plate to improve deformation resistance, U type mouth is provided on side plate to facilitate reinforcing bar to be provided;Bottom plate and side plate are all used glass steel light base material, outer cover epoxy resin wear-resistant coating containing silicon carbide particles, reduce dead weight while improve wear resistance;Vertical plate is locked side plate by double inner hexagonal bolt and reinforcing nut, to prevent pouring slurry leakage.The component is optimized by material and strengthened by structure, realizes mould light weight, high durability and fast assembly, is suitable for fabricated building composite slab production, can shorten maintenance cycle.

Description

Technical Field

[0001] This utility model relates to the field of concrete composite slab production technology, and in particular to a pre-concrete composite slab component. Background Technology

[0002] Precast concrete composite slabs are made by stacking precast slabs with cast-in-place reinforced concrete layers. The production process involves steps such as mold setting, application of release agent, insertion and binding of reinforcing bars into the mold, concrete pouring and vibration, curing and demolding.

[0003] Currently, most composite slab production molds are made of steel, which has problems such as heavy weight and difficulty in handling and assembly. In addition, steel has limited wear resistance, and after long-term use, surface wear leads to a decrease in mold precision, requiring frequent replacement and increasing production costs. Furthermore, traditional steel molds have a high thermal conductivity, and the concrete curing cycle is long, which affects production efficiency.

[0004] To address the aforementioned problems, this utility model document proposes a pre-concrete composite slab component. Utility Model Content

[0005] This utility model provides a preconcrete composite slab component, which solves the shortcomings of the existing technology, such as the large weight, easy wear and tear and long maintenance cycle of traditional steel molds.

[0006] This utility model provides the following technical solution: A precast concrete composite slab component, comprising: The base plate has four L-shaped side plates arranged in a circular array on its top. The L-shaped side plates have U-shaped openings at equal intervals for the ends of the reinforcing bars to pass through. The top of the base plate is fixedly provided with two positioning pins for positioning the corresponding L-shaped side plates. The L-shaped side plates are provided with positioning holes for the ends of the corresponding positioning pins to pass through. Vertical plates are fixedly provided at the four edges of the top of the base plate. The vertical plates have three threaded holes at equal intervals, each threaded with an internal hexagon bolt for tightly abutting against the outer wall of the L-shaped side plates. Both the base plate and the L-shaped side plate are made of a lightweight substrate with a wear-resistant coating on the outer wall.

[0007] In one possible design, a grid frame is fixedly installed in the rectangular cavity at the bottom of the base plate to improve its load-bearing capacity.

[0008] In one possible design, multiple triangular plates are fixedly arranged at equal intervals on the outer wall of the L-shaped side plate to improve its resistance to deformation.

[0009] In one possible design, the end of the internal hex bolt passes through the corresponding threaded hole and is fixedly provided with a stop block, the other side of which abuts against the outer wall of the corresponding L-shaped side plate.

[0010] In one possible design, the internal hex bolt is threaded with a reinforcing nut, one side of which abuts against the outer wall of the corresponding vertical plate.

[0011] In one possible design, the lightweight substrate is made of fiberglass, and the wear-resistant coating is a polymer composite coating with epoxy resin as the matrix and silicon carbide wear-resistant particles added.

[0012] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0013] The working principle and usage process of this technical solution are as follows: During use, the base plate is placed flat on the production table. The grid frame in the rectangular cavity at the bottom of the base plate enhances the load-bearing capacity, ensuring the base plate is flat and stable. The four L-shaped side plates are aligned with the positioning holes on the side plates using the positioning pins on the top of the base plate, achieving quick and accurate positioning. Then, the three hexagonal bolts on the vertical plate are tightened to make the abutment block press against the outer wall of the side plate, forming a preliminary fixation. The reinforcement nuts are further tightened, and the connection stability between the side plates and the base plate is enhanced through the threaded locking mechanism to prevent the side plates from deforming or shifting during the pouring process. Afterward, a release agent is sprayed on the mold surface (the surface of the base plate and the L-shaped side plates), and the pre-processed steel bars and trusses are placed in the mold, ensuring that the ends of the steel bars pass through the U-shaped openings on the L-shaped side plates and are tied and fixed. Finally, conventional grout-stopping strips are installed at each U-shaped opening to prevent grout leakage. During pouring, pre-mixed concrete is injected into the mold, and air bubbles are removed using a vibrating device to ensure compaction. The triangular plates on the outer wall of the L-shaped side plate enhance the side plate's resistance to deformation and prevent the side plate from bulging due to pouring pressure. After pouring, the surface of the component is smoothed and roughened to form a rough surface to enhance the adhesion with the subsequent cast-in-place layer. After the concrete has initially set, a moisturizing film is covered and allowed to cure until the design strength is reached. When demolding, the internal hex bolts and reinforcing nuts are loosened, the vertical plates are removed, and the component is separated from the mold.

[0014] This utility model has the following beneficial effects: The bottom plate and L-shaped side plate of this utility model are made of fiberglass lightweight substrate, which significantly reduces the weight compared to traditional steel molds, making them easier to transport and assemble. In addition, fiberglass has better thermal conductivity than steel, which can accelerate concrete curing and shorten the curing cycle. The wear-resistant coating is based on epoxy resin and contains silicon carbide particles, which helps to improve the wear resistance of the mold and thus extend its service life.

[0015] The positioning pins on the bottom plate of this utility model cooperate with the positioning holes on the L-shaped side plate, and the internal hexagon bolts and reinforcing nuts on the vertical plate ensure accurate positioning and firm fixation of the L-shaped side plate, thereby improving the precision and efficiency of mold assembly.

[0016] In this invention, the triangular plate on the outer wall of the L-shaped side plate and the grid frame inside the bottom plate form a double reinforcement structure to resist the pressure of the dispersed concrete and reduce the risk of deformation during pouring. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of a pre-concrete composite slab component provided for an embodiment of this utility model; Figure 2 A schematic diagram of the L-shaped side plate and bottom plate separation structure of a preconcrete composite slab component provided in an embodiment of this utility model; Figure 3 Another structural schematic diagram of a preconcrete composite slab component provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the planar structure of an L-shaped side plate of a preconcrete composite slab component provided in an embodiment of the present invention, in a partial cross-sectional view.

[0018] Reference numerals: 1. Base plate; 2. Grille frame; 3. Rectangular cavity; 4. L-shaped side plate; 5. U-shaped opening; 6. Triangular plate; 7. Positioning pin; 8. Positioning hole; 9. Vertical plate; 10. Hex socket head cap screw; 11. Abutment block; 12. Reinforcing nut; 13. Lightweight substrate; 14. Wear-resistant coating. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted. Example:

[0022] Please refer to Figure 1-4 A precast concrete composite slab component, used in the field of concrete composite slab production, includes a base plate 1, L-shaped side plates 4, vertical plates 9, and related fixing components: The base plate 1 is made of fiberglass lightweight substrate 13, and the surface is coated with a polymer composite wear-resistant coating 14 with epoxy resin as the matrix and silicon carbide wear-resistant particles added. The coating process adopts high pressure airless spraying, and the thickness is controlled within the range of 0.5-1mm. A rectangular cavity 3 is set at the bottom of the base plate 1, and a grid frame 2 is embedded inside. The grid frame 2 is made of galvanized steel, with a grid size of 100mm×100mm and a height consistent with the depth of the rectangular cavity 3. It is used to disperse the concrete lateral pressure borne by the base plate 1. Eight positioning pins 7 are bonded and fixed to the top of the base plate 1 with structural adhesive (such as epoxy resin). The positioning pins 7 are cylindrical parts, which are used to cooperate with the two positioning holes 8 on the L-shaped side plate 4 to achieve quick positioning.

[0023] The L-shaped side plate 4 also adopts a composite structure of fiberglass lightweight substrate 13 and wear-resistant coating 14. The angle between its vertical section and horizontal section is 90°. Each L-shaped side plate 4 has multiple U-shaped openings 5 ​​equidistantly arranged. The width of the U-shaped opening 5 is 2mm larger than the diameter of the steel bar, which is used to pass the end of the steel bar. A positioning insertion hole 8 is opened in the middle of the vertical section of the L-shaped side plate 4, which forms a clearance fit with the positioning pin 7 to ensure that the verticality deviation of the side plate is ≤1mm during assembly. Multiple triangular plates 6 are bonded and fixed to the outer wall of the L-shaped side plate 4 with structural adhesive. The triangular plates 6 are right triangles, which are used to enhance the deformation resistance of the side plate.

[0024] During assembly, four L-shaped side plates 4 are placed on top of the base plate 1 in a circular array. The positioning pins 7 are inserted into the positioning holes 8 to complete the initial positioning. Vertical plates 9 are vertically bonded to the four edges of the base plate 1 using structural adhesive. The height of the vertical plates 9 is consistent with the vertical section of the L-shaped side plates 4. Three M12 threaded holes are opened at equal intervals on the vertical plates 9. After the hexagonal socket bolts 10 pass through the threaded holes, circular abutments 11 are welded to the ends. The surface of the abutments 11 is covered with a 1mm thick rubber layer. By tightening the hexagonal socket bolts 10, the abutments 11 are pressed tightly against the outer wall of the L-shaped side plates 4. The reinforcing nut 12 connected to the thread at the tail of the hexagonal socket bolts 10 is tightened. A spring washer is placed between the reinforcing nut 12 and the outer wall of the vertical plate 9. The nuts are tightened with a torque wrench until they are pressed tightly against the outer wall of the vertical plate 9, forming a double locking structure. After the mold is assembled, water-based release agent is sprayed on the surface of the base plate 1 and L-shaped side plate 4. The spraying amount is controlled at 200-300g / m². The pre-processed steel bars and trusses are hoisted into the mold and tied and fixed to ensure that the ends of the steel bars pass through the U-shaped opening 5 accurately. A grout-stop strip is attached to each U-shaped opening 5. The grout-stop strip is made of polyethylene foam to prevent grout leakage during concrete pouring. Then, pre-mixed concrete is injected into the mold. The grouting concrete is C35 strength grade pre-mixed concrete and is vibrated with an immersion vibrator. The vibration time is based on the concrete surface showing grout and no air bubbles escaping. The triangular plate 6 on the outer wall of the L-shaped side plate 4 can effectively disperse the lateral pressure of the concrete. After the concrete has initially set, a polyethylene moisture-retaining film is placed on the surface of the component and the component is statically cured under an ambient temperature controlled at 20±5℃. Since the thermal conductivity of the fiberglass substrate 13 is 0.23W / (m·K), which is significantly lower than that of steel (45W / (m·K)), the heat exchange between the mold and the concrete can be reduced, making the internal temperature gradient of the concrete gentler and shortening the curing cycle to 12 hours (traditional steel molds require 24 hours). After the design strength is reached, the reinforcing nuts 12 and the internal hex bolts 10 are loosened in sequence. After the vertical plate 9 is removed, the L-shaped side plate 4 is vertically lifted using the guiding action of the positioning pin 7 to achieve non-destructive demolding.

[0025] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0026] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A precast concrete composite slab element, characterised in that, include: The base plate (1) has four L-shaped side plates (4) arranged in a ring array on its top. The L-shaped side plates (4) are provided with U-shaped openings (5) for the end of the reinforcing bars to pass through at equal intervals. The top of the base plate (1) is fixedly provided with two positioning pins (7) for positioning the corresponding L-shaped side plates (4). The L-shaped side plates (4) are provided with positioning holes (8) for the end of the corresponding positioning pins (7) to pass through. Vertical plates (9) are fixedly provided at the four edges of the top of the base plate (1). The three threaded holes on the vertical plates (9) are threaded with hexagonal bolts (10) for tightly abutting against the outer wall of the L-shaped side plates (4). The base plate (1) and the L-shaped side plate (4) are both made of a lightweight substrate (13) with a wear-resistant coating (14) on the outer wall.

2. A precast concrete composite slab element according to claim 1, characterised in that A grid frame (2) is fixedly installed in the rectangular cavity (3) at the bottom of the base plate (1) to improve its load-bearing capacity.

3. A precast concrete composite slab element according to claim 1, wherein Multiple triangular plates (6) are fixedly arranged at equal intervals on the outer wall of the L-shaped side plate (4) to improve its deformation resistance.

4. A precast concrete composite slab element according to claim 1, wherein The end of the internal hex bolt (10) passes through the corresponding threaded hole and is fixedly provided with a stop block (11), and the other side of the stop block (11) is tightly against the outer wall of the corresponding L-shaped side plate (4).

5. A precast concrete composite slab member according to claim 1, wherein The internal hex bolt (10) is threaded with a reinforcing nut (12), one side of which is tightly against the outer wall of the corresponding vertical plate (9).

6. A precast concrete composite slab member according to claim 1, wherein The lightweight substrate (13) is made of fiberglass.

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