A precast concrete beam mold

Abstract

This utility model belongs to the technical field of building materials, specifically relating to a precast concrete beam mold, including a base plate, side plates, and a sealing plate. Each side of the sealing plate has a buckle fixed at its midpoint along its width direction. Each buckle has a slot, the opening of which faces away from the sealing plate. Each of the outermost sides of the side plates along their length direction has a screw hinged to its midpoint. The tail of each screw is threaded with a nut, and the screw can engage with the corresponding slot of the buckle on the sealing plate. The buckle is secured to the sealing plate and side plate by tightening the nut between the nut and the screw head. This utility model solves the problem of grout leakage caused by lateral pressure during concrete pouring, improves overall sealing and stability, ensures the dimensional accuracy and surface quality of the concrete beam, meets the assembly requirements of building structures, and helps guarantee the strength and durability of the concrete beam.

Description

Technical Field

[0001] This utility model belongs to the technical field of building materials, specifically relating to a precast concrete beam mold. Background Technology

[0002] As a crucial load-bearing component in building structures, the quality and production efficiency of concrete beams have a vital impact on the progress and quality of the entire construction project. Traditional concrete beam fabrication methods often involve on-site casting. On-site casting requires the construction of complex formwork systems on the construction site, which not only consumes large amounts of timber, steel, and other formwork materials, increasing construction costs, but also involves tedious formwork erection and dismantling work, requiring significant manpower and extending the construction period. Furthermore, on-site casting is greatly affected by environmental factors, such as weather changes and site conditions, which can easily affect the quality of the concrete beams, leading to quality problems such as uneven surfaces and large dimensional deviations, ultimately impacting the safety and stability of the building structure.

[0003] With the increasing demands for construction efficiency and quality in the construction industry, prefabricated modular buildings are gradually becoming a development trend. Precast concrete beams, as an important component of precast modular buildings, have advantages such as high production efficiency, controllable quality, and short construction cycles. Currently, most precast concrete beam molds are designed for single use, such as laying plastic film on the ground and using plywood to cut and support the formwork, reinforced step by step with nails. These molds cannot be reused, resulting in serious material waste, increased construction waste, and significantly higher construction costs. Even if some molds are designed to be reusable, their fixed dimensions cannot be adjusted for different specifications, further increasing costs and management complexity.

[0004] Existing technologies include research addressing the problems of current precast concrete beam molds. For example, patent CN117067365A – an adjustable precast concrete lintel mold and its usage method – adjusts the length through a sliding partition and a gear and rack mechanism. While this achieves variable dimensions, the structure is complex, relies on the meshing precision of the gear and rack, and is prone to jamming due to concrete slurry seepage. The partition also requires bidirectional insertion into the slot and relies on rotating buckles for fixation, making disassembly and assembly cumbersome. Mold reassembly requires module reassembly, resulting in poor on-site adaptability. Patent CN216707846U – a variable-length precast lintel mold – uses the pins on the end cap plate and the limiting holes on the side plate to adjust the length. While this improves the mold's versatility, the sealing and stability of the end cap plate are insufficient, making it prone to grout leakage during concrete pouring. This makes it difficult to guarantee dimensional accuracy, resulting in large dimensional deviations in the produced concrete beams, failing to meet the assembly requirements of building structures, and even affecting their strength and durability.

[0005] In summary, existing precast concrete beam molds have complex structures, making assembly and disassembly difficult. They also exhibit poor sealing and stability, making them highly susceptible to grout leakage during concrete pouring. This results in significant dimensional deviations, failing to meet the assembly requirements of building structures and potentially affecting the strength and durability of the concrete beams. Therefore, a new technical solution is needed to address these problems. Utility Model Content

[0006] The purpose of this utility model is to provide a precast concrete beam mold to solve the problems mentioned in the background art, such as the complex structure of the current precast concrete beam mold, the difficulty in assembly and disassembly, the poor sealing and stability, the easy occurrence of grout leakage during concrete pouring, the large dimensional deviation, the inability to meet the assembly requirements of building structures, and even the impact on the strength and durability of the concrete beam.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a precast concrete beam mold, comprising a base plate and side plates hinged to both sides of the base plate via pins. A sealing plate is hinged to each end of the base plate via pins. A buckle is fixed to the middle of each side of the sealing plate along its width direction. Each buckle has a slot, the opening of which faces away from the sealing plate. A screw is hinged to the middle of the outer side wall at each end of the side plate along its length direction. A nut is threaded to the tail of each screw. The screw can be engaged into the corresponding slot of the buckle on the sealing plate. The buckle is secured to the sealing plate and side plate by tightening the nut between the nut and the head of the screw.

[0008] Furthermore, a positioning block is fixed at each end of the top of the sealing plate along its width direction, and a limiting slide rail that cooperates with the positioning block is fixed at each end of the top of the side plate along its length direction; the positioning block is slidably embedded in the limiting slide rail.

[0009] Furthermore, the bottom of the side plate has a number of side ear plates evenly distributed along its length, and the side wall of the bottom plate has a number of side ear seats corresponding to the side ear plates evenly distributed along its length; the side ear seats are hinged to the side ear plates by pins.

[0010] Furthermore, an end ear plate is fixed at each end of the bottom of the sealing plate along its width direction, and an end ear seat corresponding to the end ear plate is fixed at each end of the end wall of the bottom plate along its width direction; the end ear seat is hinged to the end ear plate by a pin.

[0011] Furthermore, the height of the sealing plate is equal to the height of the side plate, the width of the sealing plate is greater than the width of the bottom plate, and the length of the bottom plate is equal to the length of the side plate; the width of the sealing plate is the sum of the width of the bottom plate and the thickness of the two side plates.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model uses a pin to hinge the side plate and the sealing plate to the base plate, so that the side plate, sealing plate and base plate can form an integrated box mold structure, making the assembly and disassembly of the mold extremely simple, realizing a one-release-and-open demolding method, and effectively avoiding the problem of affecting the sealing of the joint due to repeated disassembly; on this basis, combined with the locking mechanism of buckles and screw nuts, a rigid locking structure is formed at the connection between the sealing plate and the side plate. Compared with the existing rotating buckle fixing method, this precast mold reduces the need for precision mechanical parts, thereby avoiding the problem of jamming caused by concrete slurry seepage, improving the convenience and efficiency of on-site operation, and also effectively avoiding the problem of slurry leakage caused by the lateral pressure during concrete pouring, improving the overall sealing and stability of the precast mold, effectively ensuring the dimensional accuracy and surface quality of the concrete beam, meeting the assembly requirements of the building structure, and helping to ensure the strength and durability of the concrete beam;

[0014] 2. This utility model achieves precise alignment and dynamic constraint between the sealing plate and the side plate by sliding the positioning block at the top of the sealing plate and the slide rail at the top of the side plate. No additional measurement or adjustment is required, reducing human error and ensuring that the sealing plate will not shift under the action of concrete lateral pressure, avoiding grout leakage and improving the dimensional accuracy of the concrete beam. The pin hinge of the side ear plate and the side ear seat enables flexible connection between the side plate and the bottom plate. Multiple hinge points are distributed along the length of the side plate, which can evenly distribute the lateral pressure during concrete pouring and prevent mold deformation. The pin hinge of the end ear plate and the end ear seat enables stable connection between the sealing plate and the bottom plate. The two hinge points limit the bottom displacement of the sealing plate. Combined with the top screw-clasp structure, a mechanism of upper and lower constraint is formed, which completely solves the problem of the sealing plate tilting outward under concrete pressure.

[0015] 3. By optimizing the dimensions of the sealing plate, side plate and bottom plate, this utility model enables the sealing plate to completely cover the end face of the side plate, eliminating splicing gaps, and also effectively avoiding material redundancy caused by the sealing plate being too wide, effectively reducing the mold customization cost and ensuring the quality of the concrete beam edge forming.

[0016] 4. This utility model, through a hinged base plate, three-dimensional sealing, and size optimization, enables the precast mold to achieve high-precision molding with zero grout leakage while allowing for easy demolding. By transforming the contradictions of sealing, adjustability, and operability into synergistic benefits, it achieves the functions of traditional precision components with a minimalist mechanical structure. It provides a standardized mold solution for precast concrete beams that is "leak-free and quick to assemble and disassemble," expanding overall benefits and demonstrating its potential for widespread adoption. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the prefabricated mold of this utility model in a closed state;

[0018] Figure 2 for Figure 1 A schematic diagram of the side structure;

[0019] Figure 3 This is a schematic diagram of the prefabricated mold of this utility model in the open state;

[0020] Figure 4 This is a side view of the sealing plate of this utility model;

[0021] Figure 5 This is a top view of the sealing plate of this utility model;

[0022] Figure 6 for Figure 1 Schematic diagram of the middle side plate;

[0023] Figure 7 for Figure 6 A schematic diagram of the side structure of the middle side plate.

[0024] The components are: 1. Base plate; 2. Side plate; 3. Sealing plate; 4. Pin A; 5. Pin B; 6. Buckle; 601. Slot; 7. Screw; 8. Nut; 9. Positioning block; 10. Limiting slide rail; 11. Side ear plate; 12. Side ear seat; 13. End ear plate; 14. End ear seat; 15. Pin C. Detailed Implementation

[0025] The following embodiments are used to further illustrate the content of this utility model, and do not limit the application of this utility model.

[0026] Please see Figures 1-7 This utility model provides a precast concrete beam mold, including a base plate 1, side plates 2 hinged to both sides of the base plate 1 by pin A4, and sealing plates 3 hinged to both ends of the base plate by pin B5. Each side of the sealing plate 3 has a buckle 6 fixed in the middle of its width direction. The buckle 6 has a U-shaped groove 601 with the opening facing away from the sealing plate 3. Each side plate 2 has a screw 7 hinged to the middle of its outer side wall at both ends in the length direction by pin C15. The tail of the screw 7 is threaded with a nut 8. The screw 7 can be inserted into the groove 601 of the corresponding buckle 6 on the sealing plate 3. By tightening the nut 8, the buckle 6 is pressed between the nut 8 and the head of the screw 7, so that the sealing plate 3 is locked to the end of the side plate 2.

[0027] A positioning block 9 is fixed at each end of the top of the sealing plate 3 along its width direction, and a limiting slide rail 10 that cooperates with the positioning block 9 is fixed at each end of the top of the side plate 2 along its length direction. The positioning block 9 is slidably embedded in the limiting slide rail 10, so that the sealing plate 3 can be precisely aligned with the side plate 2 to achieve dynamic constraint.

[0028] The bottom of the side plate 2 has a number of side ear plates 11 evenly distributed along its length direction. The side wall of the bottom plate 1 has a number of side ear seats 12 that correspond to the side ear plates 11 evenly distributed along its length direction. The side ear seats 12 are hinged to the side ear plates 11 by a pin A4, so that the side plate 2 can rotate on the side of the bottom plate 1 with the pin A4 as the fulcrum.

[0029] The bottom of the sealing plate 3 is fixed with an end ear plate 13 at each end along its width direction. The end wall of the bottom plate 1 is fixed with an end ear seat 14 corresponding to the end ear plate 13 at each end along its width direction. The end ear seat 14 is hinged to the end ear plate 13 by a pin B5, so that the sealing plate 3 can rotate at the end of the bottom plate 1 with the pin B5 as the fulcrum.

[0030] The height of the sealing plate 3 is equal to the height of the side plate 2. The width of the sealing plate 3 is greater than the width of the bottom plate 1. The length of the bottom plate 1 is equal to the length of the side plate 2. The width of the sealing plate 3 is the sum of the width of the bottom plate 1 and the thickness of the two side plates 2, so that the sealing plate 3 can completely cover the end face of the side plate 2 and eliminate the splicing gap.

[0031] The working principle and usage process of this utility model are as follows: Figures 1-7 As shown, after the precast concrete beam mold is assembled, the operator fixes the mold to the ground. This is to solve the problem of grout leakage caused by the lateral pressure during concrete pouring, improve the overall sealing and stability, ensure the dimensional accuracy and surface quality of the concrete beam, meet the assembly requirements of the building structure, and help ensure the strength and durability of the concrete beam.

[0032] When casting precast concrete beams, operators must first apply a release agent to the upper surface of the base plate 1 and the inner sides of the side plates 2 and the sealing plate 3 to facilitate concrete demolding. Then, the reinforcing bars and embedded connectors are tied and placed on the base plate 1 according to the requirements for concrete beam fabrication, or the reinforcing bars and embedded connectors are tied directly on the base plate 1 according to the requirements for concrete beam fabrication. Then, the side plate 2 is rotated to the side perpendicular to the base plate 1 with pin A4 as the fulcrum (i.e., the side plate 2 is in a closed state). Then, the sealing plate 3 is rotated to the end perpendicular to the base plate 1 with pin B5 as the fulcrum (i.e., the sealing plate 3 is in a closed state). At the same time, the positioning block 9 is aligned with the limiting slide rail 10 and slidably embedded in the limiting slide rail 10, so that the sealing plate 3 can be accurately positioned at the end of the side plate 2. Then, the screw 7 on the outer wall of the side plate 2 is rotated with the pin C15 as the fulcrum, so that the rod part of the screw 7 is inserted into the slot 601. Then, the nut 8 is tightened to press the buckle 6 between the nut 8 and the head of the screw 7, so that the sealing plate 3 is locked to the end of the side plate 2, thereby forming a box mold structure with a top opening. Finally, concrete is injected into the top opening of the box mold structure, so that the concrete fills the entire box mold structure. After the concrete solidifies, a precast concrete beam is formed.

[0033] When the concrete beam needs to be demolded, the operator first loosens the nut 8, and then pulls the rod of the screw 7 out of the slot 601. This allows the side plate 2 to rotate around the pin A4 to a position approximately horizontal to the side of the bottom plate 1 (i.e., the side plate 2 is in the open state). At the same time, the sealing plate 3 rotates around the pin B5 to a position approximately horizontal to the end of the bottom plate 1 (i.e., the sealing plate 3 is in the open state), thus achieving a demolding method that allows for immediate opening upon loosening.

[0034] When side plate 2 is in the open position, the operator rotates screw 7 with pin C15 as the fulcrum to the outer side wall perpendicular to side plate 2, so that screw 7 acts as a support point to support side plate 2, thereby effectively avoiding the problem of side plate 2 being damaged by direct contact with the ground.

Claims

1. A precast concrete beam form comprising a base plate and side plates hinged to the base plate on either side by a pin, characterised in that, Each end of the base plate is hinged to a sealing plate via a pin. Each sealing plate has a buckle fixed at the middle of its two sides along its width direction. Each buckle has a slot, and the opening of the slot is facing away from the sealing plate. Each side plate has a screw hinged to the middle of its outer side wall at both ends along its length direction. The tail of each screw is threaded with a nut. The screw can be engaged into the slot of the corresponding buckle on the sealing plate. The buckle is locked to the sealing plate and the side plate by tightening the nut between the nut and the head of the screw.

2. A concrete beam precasting form according to claim 1, wherein A positioning block is fixed at each end of the top of the sealing plate along its width direction, and a limiting slide rail that cooperates with the positioning block is fixed at each end of the top of the side plate along its length direction.

3. A concrete beam precasting form according to claim 2, wherein, The positioning block is slidably embedded in the limiting slide rail.

4. A concrete beam precasting form according to claim 1, wherein The bottom of the side plate has a number of side ear plates evenly distributed along its length, and the side wall of the bottom plate has a number of side ear seats corresponding to the side ear plates evenly distributed along its length.

5. A concrete beam precasting form according to claim 4 wherein, The side ear seat is hinged to the side ear plate via a pin.

6. A precast concrete beam mold according to claim 1, characterized in that, The bottom of the sealing plate has an end ear plate fixed at each end along its width direction, and the end wall of the bottom plate has an end ear seat corresponding to the end ear plate fixed at each end along its width direction.

7. A concrete beam precasting mould according to claim 6, characterised in that The end ear seat is hinged to the end ear plate via a pin.

8. A concrete beam precasting form according to claim 1 wherein, The height of the sealing plate is equal to the height of the side plate, the width of the sealing plate is greater than the width of the bottom plate, and the length of the bottom plate is equal to the length of the side plate.

9. A concrete beam precasting mould according to claim 8, characterised in that, The width of the sealing plate is the sum of the width of the bottom plate and the thickness of the two side plates.

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