Concrete box culvert forming device

Abstract

The utility model discloses a concrete box culvert forming device, and relates to the technical field of box culvert molds. Two T-shaped blocks, two hydraulic cylinders and an outer mold are fixedly installed at the top of the bottom plate, one side of the outer mold is connected with a side mold plate through a hinge, and a fixing hole is formed in one side of the side mold plate. A box culvert air bag demolding assembly used for facilitating demolding after a cavity in the middle of a box culvert is formed is arranged on the other side of the outer mold, the fixing holes are used in cooperation with the box culvert air bag demolding assembly, a high-precision sliding guide structure is formed by arranging T-shaped blocks matched with T-shaped grooves in the bottoms of supporting plates, and hydraulic cylinders are used for pushing the supporting plates to move; after concrete pouring is completed, when the box culvert air bag demolding assembly is installed, the fixing holes can guide the installation frame to be accurately inserted, displacement or shaking of the box culvert air bag demolding assembly is prevented, and the box culvert air bag demolding assembly is used for forming a cavity in a box culvert and achieving convenient and efficient demolding.

Description

Technical Field

[0001] This utility model relates to the field of box culvert mold technology, specifically to a concrete box culvert forming device. Background Technology

[0002] Concrete box culverts are typical precast concrete structures in municipal and transportation engineering. They have a closed rectangular or arched cross section and are widely used in urban drainage systems, integrated utility tunnels, railway and highway underpasses, and other scenarios. Their core function is to construct underground linear space: the hollow cavity formed by prefabrication or cast-in-place processes can simultaneously meet the complex needs of drainage, pipeline laying, and pedestrian and vehicular passage. The box culvert is made of cast concrete and resists soil lateral pressure and ground load with its rigid structure. The internal steel reinforcement skeleton enhances crack resistance, and the outer layer can be sprayed with an anti-corrosion coating to adapt to the groundwater erosion environment.

[0003] In existing technologies, traditional hollow box culvert molding relies on fixed core molds such as wooden molds and steel molds, which are pre-embedded in concrete. Demolding requires manual hammering or disassembly in sections. This method is not only inefficient, but also easily damages the inner wall of the box culvert. At the same time, the manual hammering and disassembly process is time-consuming and laborious, further reducing work efficiency and making it difficult to adapt to high-efficiency construction scenarios. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a concrete box culvert molding device, which has the advantages of avoiding manual hammering and prying, reducing surface damage, and improving work efficiency. This solves the problems of needing to manually hammer during demolding, which easily damages the inner wall of the box culvert and results in low work efficiency.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution: a concrete box culvert forming device, including a base plate, two T-shaped blocks fixedly installed on the top of the base plate, two hydraulic cylinders fixedly installed on the top of the base plate, an outer mold fixedly installed on the top of the base plate, a side template connected to one side of the outer mold via a hinge, a fixing hole provided on one side of the side template, and a box culvert airbag demolding component provided on the other side of the outer mold for easy demolding after forming the middle cavity of the box culvert, the fixing hole being used in conjunction with the box culvert airbag demolding component.

[0006] As a preferred technical solution of this utility model, the box culvert airbag demolding assembly includes a support plate, which is set on the top of the base plate. One side of the support plate is fixedly installed with the output ends of two hydraulic cylinders, and the other side of the support plate is fixedly installed with an installation frame. An air pump is fixedly installed inside the installation frame, and an airbag inner mold is fixedly installed on the outside of the installation frame. The airbag inner mold is connected to the air pump through a conduit. The air outlet of the air pump is fixedly connected to one end of the conduit, and the other end of the conduit passes through a round hole at the top of the installation frame and is fixedly connected to the airbag inner mold.

[0007] As a preferred embodiment of this utility model, the bottom of the support plate has two T-shaped grooves, which are movably connected to the T-shaped block.

[0008] As a preferred technical solution of this utility model, two U-shaped mounting blocks are fixedly installed on both sides of the outer mold. Limiting grooves are respectively opened on the inner bottom surface of the two U-shaped mounting blocks. Springs are fixedly installed on one side of the inner surface of the two U-shaped mounting blocks. Rectangular blocks are fixedly installed on the other end of the two springs. Limiting blocks are fixedly installed at the bottom of the rectangular blocks. The limiting blocks are used in conjunction with the limiting grooves.

[0009] As a preferred embodiment of this utility model, the top of the U-shaped mounting block is provided with a movable hole, and a locking rod is movably inserted into the movable hole.

[0010] As a preferred embodiment of this utility model, pins are fixedly installed on both sides of the support plate. The pins are used in conjunction with the U-shaped mounting blocks. Locking holes are opened on the top of the two pins, and the locking holes are used in conjunction with the locking rods.

[0011] The beneficial effects of this utility model are as follows:

[0012] This utility model fixes the side template and the outer mold by passing bolts through the threaded holes on the fixing block on one side of the side template and the outer mold. The hydraulic cylinder is activated to push the support plate along the T-shaped block to the side of the outer mold until the mounting frame is inserted into the fixing hole. During the movement, the pin is inserted into the U-shaped mounting block, and the locking rod automatically falls and inserts into the locking hole, completing the fixation of the support plate and the outer mold. An external power supply is connected to start the air pump to inflate the mold inside the airbag, causing it to expand and form the middle cavity of the box culvert. Subsequently, a release agent is sprayed inside the outer mold and on the surface of the mold inside the airbag. Concrete is then injected from the top of the outer mold and left to solidify.

[0013] After the concrete has solidified, manually pull the locking rod to disengage from the locking hole, release the lock between the support plate and the outer mold, open the air pump vent valve, slowly release the gas in the mold inside the airbag, and at the same time start the hydraulic cylinder to retract, pull the support plate backward, so that the mold inside the airbag is separated from the middle hole of the solidified box culvert. Finally, unscrew the side formwork bolts, open the side formwork, and lift the formed box culvert from one side of the side formwork using a gantry crane. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the concrete box culvert forming device of this utility model;

[0015] Figure 2 This is a schematic diagram of the side template structure of this utility model;

[0016] Figure 3This is a schematic diagram of the structure of the box culvert airbag demolding component of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the box culvert airbag demolding component of this utility model;

[0018] Figure 5 This is a schematic diagram of the U-shaped mounting block structure of this utility model.

[0019] Reference numerals: 1. Base plate; 2. Outer mold; 3. T-block; 4. Hydraulic cylinder; 5. Support plate; 501. Mounting frame; 502. Inner mold of airbag; 503. Air pump; 504. T-slot; 6. Side template; 601. Fixing hole; 7. U-shaped mounting block; 701. Limiting groove; 702. Spring; 703. Movable hole; 704. Locking rod; 705. Rectangular block; 706. Limiting block; 8. Pin; 801. Locking hole. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0021] Figures 1-5 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 - Appendix Figure 5 The present invention will be further described below.

[0022] A concrete box culvert forming device includes a base plate 1, two T-shaped blocks 3 fixedly installed on the top of the base plate 1, two hydraulic cylinders 4 fixedly installed on the top of the base plate 1, an outer mold 2 fixedly installed on the top of the base plate 1, a side template 6 connected to one side of the outer mold 2 via a hinge, a fixing hole 601 opened on one side of the side template 6, and a box culvert airbag demolding component provided on the other side of the outer mold 2 for easy demolding after forming the middle cavity of the box culvert, the fixing hole 601 is used in conjunction with the box culvert airbag demolding component.

[0023] In this implementation scheme, a base plate 1 is set up to create a stable installation surface for other components. The T-shaped block 3 and the T-shaped groove 504 at the bottom of the support plate 5 cooperate with each other to form a high-precision sliding guide structure, ensuring that the support plate 5 moves accurately. Sealing strips are installed on both sides of the outer mold 2, and correspondingly, a sealing groove is opened on one side of the side template 6. The two fit tightly together to effectively prevent concrete from flowing out during the pouring process. In addition, both the outer mold 2 and the side template 6 are fixedly installed with fixing blocks with threaded holes. By screwing bolts into the fixing blocks, a stable connection between the outer mold 2 and the side template 6 is achieved. During installation, the hydraulic cylinder 4 extends to push the support plate 5 and the connected box culvert airbag demolding assembly. The inner mold 502 of the airbag moves outward, allowing it to accurately enter the predetermined position inside the outer mold 2, ensuring a tight fit between the two. The shape and size of the outer mold 2 determine the external contour of the concrete box culvert. The side template 6 is connected to the outer mold 2 via hinges. After the concrete is poured, the box culvert can be easily removed by simply opening the side template 6. The fixing hole 601 on one side of the side template 6 guides the installation frame 501 to be accurately inserted when installing the box culvert airbag demolding assembly, ensuring that the relative position of the inner mold 502 of the airbag and the outer mold 2 is accurate and preventing displacement or shaking. The box culvert airbag demolding assembly is used to form the internal cavity of the box culvert and to achieve convenient and efficient demolding.

[0024] Specifically, the box culvert airbag demolding assembly includes a support plate 5, which is set on the top of the base plate 1. One side of the support plate 5 is fixedly installed with the output ends of two hydraulic cylinders 4, and the other side of the support plate 5 is fixedly installed with an installation frame 501. An air pump 503 is fixedly installed inside the installation frame 501, and an airbag inner mold 502 is fixedly installed on the outside of the installation frame 501. The airbag inner mold 502 is connected to the air pump 503 through a conduit. The air outlet of the air pump 503 is fixedly connected to one end of the conduit, and the other end of the conduit passes through the round hole at the top of the installation frame 501 and is fixedly connected to the airbag inner mold 502.

[0025] In this embodiment, by setting up a support plate 5, when installing the inner airbag mold 502 into the outer mold 2, the support plate 5 moves smoothly by the thrust of the hydraulic cylinder 4, ensuring that the inner airbag mold 502 is accurately positioned. During demolding, the hydraulic cylinder 4 pulls the inner airbag mold 502 out of the formed box culvert smoothly. A sealing groove is provided on one side of the support plate 5, which works in conjunction with the sealing strip on the outer mold 2 to form a completely sealed space to prevent concrete from flowing out. At the same time, the support plate 5 provides a stable mounting surface for the mounting frame 501 and components such as the air pump 503 and the inner airbag mold 502 on the mounting frame 501. The mounting frame 501 serves as the mounting carrier for the air pump 503 and the inner airbag mold 502. The shape and size design of the mounting frame 501 allow it to precisely fit with the fixing holes 601 on the side template 6. During installation, the mounting frame 501 is inserted into the fixing holes 601. 01. To achieve precise positioning and connection between the box culvert airbag demolding component and the side template 6, preventing displacement or shaking, the air pump 503 is the core power equipment for inflating the airbag inner mold 502. The device is powered by an external power source from the construction site. The airbag inner mold 502 adopts a composite structure of wear-resistant outer layer and high-elasticity inner layer, with an orthogonal nylon mesh embedded inside. When subjected to the lateral pressure during concrete pouring and the impact force during vibration, it can maintain a stable shape and will not deform excessively. In the inflated state, it expands to the predetermined shape, occupying the internal space of the box culvert and providing a precise inner mold shape for concrete pouring. After the concrete solidifies, the airbag inner mold 502 deflates and shrinks. Its elastic properties allow it to quickly separate from the concrete surface, greatly reducing demolding resistance. Combined with the movement of the support plate 5 under the action of the hydraulic cylinder 4, non-destructive demolding can be achieved.

[0026] Specifically, the bottom of the support plate 5 has two T-shaped grooves 504, which are movably connected to the T-shaped block 3.

[0027] In this embodiment, by setting a T-shaped groove 504 that closely matches the T-shaped block 3, the support plate 5 moves more smoothly and stably, reducing the occurrence of jamming. When the hydraulic cylinder 4 pushes the support plate 5, the T-shaped groove 504 slides along the surface of the T-shaped block 3. The close fit between the two and the reasonable tolerance ensure the stability and accuracy of the support plate 5 during movement.

[0028] Specifically, two U-shaped mounting blocks 7 are fixedly installed on both sides of the outer mold 2. Limiting grooves 701 are opened on the inner bottom surface of the two U-shaped mounting blocks 7. Springs 702 are fixedly installed on one side of the inner surface of the two U-shaped mounting blocks 7. Rectangular blocks 705 are fixedly installed on the other end of the two springs 702. Limiting blocks 706 are fixedly installed on the bottom of the rectangular blocks 705. The limiting blocks 706 are used in conjunction with the limiting grooves 701.

[0029] In this embodiment, a U-shaped mounting block 7 serves as a key structure connecting the outer mold 2 and the pin 8. A limiting groove 701 is formed on the inner bottom surface of the U-shaped mounting block 7, which works in conjunction with the limiting block 706 at the bottom of the rectangular block 705 to precisely limit the horizontal displacement of the rectangular block 705. During the movement of the rectangular block 705 by the pin 8 on the support plate 5, the limiting groove 701 ensures that the rectangular block 705 can only move horizontally, guaranteeing that the locking hole 801 at the top of the pin 8 and the movable hole 703 at the top of the U-shaped mounting block 7 can be precisely aligned. A spring 702 is installed inside the U-shaped mounting block 7, its function being to keep the rectangular block 705 below the movable hole 703 until the pin 8 is inserted. When the spring 702 is in its natural state, it positions the rectangular block 705 in a suitable position, preventing the locking rod 704 from falling into the U-shaped mounting block 7 from the movable hole 703. When the pin 8 pushes the rectangular block 705 to slide and the locking hole 801 aligns with the movable hole 703, the elastic force of the spring 702 can assist the locking rod 704 to fall smoothly into the locking hole 801, realizing the automatic locking function. At the same time, when demolding, after manually pulling out the locking rod 704, the spring 702 can push the rectangular block 705 to reset, so that the pin 8 can be smoothly withdrawn, improving the convenience and efficiency of operation. The limiting block 706 is tightly engaged with the limiting groove 701 on the bottom surface of the U-shaped mounting block 7, limiting the horizontal displacement of the rectangular block 705.

[0030] Specifically, the top of the U-shaped mounting block 7 has a movable hole 703, and a locking rod 704 is movably inserted into the movable hole 703.

[0031] In this embodiment, by setting a locking rod 704, when the pin 8 pushes the rectangular block 705 to move, so that the locking hole 801 at the top of the pin 8 is aligned with the movable hole 703 at the top of the U-shaped mounting block 7, the locking rod 704 can quickly fall into the locking hole 801 through the movable hole 703. The movable hole 703 provides precise positioning and guidance for the insertion and removal of the locking rod 704.

[0032] Specifically, pins 8 are fixedly installed on both sides of the support plate 5. The pins 8 are used in conjunction with the U-shaped mounting block 7. The top of the two pins 8 are respectively provided with locking holes 801, which are used in conjunction with locking rods 704.

[0033] In this embodiment, by setting a pin 8, during the mold assembly stage, when the hydraulic cylinder 4 pushes the support plate 5 to move outward, the pin 8 gradually approaches the U-shaped mounting block 7. Its structure is compatible with the internal structure of the U-shaped mounting block 7, and it can be smoothly inserted into the U-shaped mounting block 7, pushing the rectangular block 705 to move, thereby establishing a preliminary connection between the entire box culvert airbag demolding assembly and the outer mold 2. The locking hole 801 is opened at the top of the pin 8. When the pin 8 pushes the rectangular block 705 to a suitable position, so that the locking hole 801 is precisely aligned with the movable hole 703 at the top of the U-shaped mounting block 7, the locking rod 704 can smoothly fall into the locking hole 801 through the movable hole 703.

[0034] In summary: When using this utility model, the base plate 1 is placed on the construction site. One side of the outer mold 2 is connected to the side template 6 via a hinge. Both the side template 6 and the outer mold 2 are equipped with fixing blocks with threaded holes. A stable connection between the two is achieved by screwing bolts into the fixing blocks. At the same time, the sealing strips on both sides of the outer mold 2 tightly cooperate with the sealing groove on one side of the side template 6 to prevent concrete from flowing out during pouring. When the hydraulic cylinder 4 is activated, as the hydraulic cylinder 4 extends, it pushes the support plate 5 and its connected box culvert airbag demolding assembly to move outward, causing the mounting frame 501 to gradually approach the fixing hole 601 on the side template 6 and be accurately inserted. The precise positioning and connection of the air-filled demolding assembly of the box culvert to the side formwork 6 are achieved. A sealing groove is provided on one side of the support plate 5, which works in conjunction with the sealing strip on the outer mold 2 to form a completely sealed space, preventing concrete leakage. During movement, the pins 8 fixedly installed on both sides of the support plate 5 gradually approach the U-shaped mounting blocks 7 on both sides of the outer mold 2. The pins 8 insert into the U-shaped mounting blocks 7, pushing the rectangular block 705 to move. As the pins 8 push the rectangular block 705, the spring 702 is compressed. When the locking hole 801 at the top of the pin 8 precisely aligns with the movable hole 703 at the top of the U-shaped mounting block 7, the locking rod 704 engages. The support plate 5 falls into the locking hole 801 through the movable hole 703, locking the outer mold 2. The device is powered by an external power source connected to the construction site to supply power to the air pump 503. The air pump 503 inflates the inner mold 502 of the air bladder through a conduit. The inner mold 502 of the air bladder adopts a composite structure of a wear-resistant outer layer and a highly elastic inner layer, with an orthogonal nylon mesh embedded inside. After inflation, it expands to a predetermined shape, occupying the internal space of the box culvert and providing a precise inner mold shape for concrete pouring. After spraying a release agent inside the outer mold 2 and on the surface of the inner mold 502 of the air bladder, concrete is poured from the top of the outer mold 2. After the concrete has solidified, the air pump 503 is turned on. The vent valve at 03 releases air, causing the inner mold 502 of the airbag to contract. Its elastic properties allow it to quickly separate from the concrete surface, greatly reducing demolding resistance. Manually pull up the locking rod 704 on the top of the U-shaped mounting block 7 to release the lock between the support plate 5 and the outer mold 2. Start the hydraulic cylinder 4 to contract, pulling the support plate 5 and the inner mold 502 of the airbag outward. The T-shaped groove 504 slides along the surface of the T-shaped block 3, allowing the inner mold 502 of the airbag to smoothly detach from the formed box culvert. Unscrew the bolts on the side template 6, open the side template 6, and use a gantry crane to lift the box culvert away from one side of the side template 6, completing the entire demolding process.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A concrete box culvert forming device, characterized in that, Includes a base plate (1), on which two T-shaped blocks (3) are fixedly installed, and on which two hydraulic cylinders (4) are fixedly installed, and on which an outer mold (2) is fixedly installed, and on one side of the outer mold (2) is a side template (6) connected by a hinge, and on one side of the side template (6) is a fixing hole (601), and on the other side of the outer mold (2) is a box culvert airbag demolding component for easy demolding after forming the middle cavity of the box culvert, and the fixing hole (601) is used in conjunction with the box culvert airbag demolding component.

2. The concrete box culvert forming device according to claim 1, characterized in that, The box culvert airbag demolding assembly includes a support plate (5), which is set on the top of the base plate (1). One side of the support plate (5) is fixedly installed with the output ends of two hydraulic cylinders (4), and the other side of the support plate (5) is fixedly installed with an installation frame (501). An air pump (503) is fixedly installed inside the installation frame (501), and an airbag inner mold (502) is fixedly installed on the outside of the installation frame (501). The airbag inner mold (502) is connected to the air pump (503) through a conduit. The air outlet end of the air pump (503) is fixedly connected to one end of the conduit, and the other end of the conduit passes through the round hole at the top of the installation frame (501) and is fixedly connected to the airbag inner mold (502).

3. The concrete box culvert forming device according to claim 2, characterized in that, The bottom of the support plate (5) has two T-shaped grooves (504), which are movably connected to the T-shaped block (3).

4. The concrete box culvert forming device according to claim 2, characterized in that, Two U-shaped mounting blocks (7) are fixedly installed on both sides of the outer mold (2). Limiting grooves (701) are opened on the inner bottom surface of the two U-shaped mounting blocks (7). Springs (702) are fixedly installed on one side of the inner surface of the two U-shaped mounting blocks (7). Rectangular blocks (705) are fixedly installed on the other end of the two springs (702). Limiting blocks (706) are fixedly installed on the bottom of the rectangular blocks (705). The limiting blocks (706) are used in conjunction with the limiting grooves (701).

5. The concrete box culvert forming device according to claim 4, characterized in that, The top of the U-shaped mounting block (7) is provided with a movable hole (703), and a locking rod (704) is movably inserted into the movable hole (703).

6. The concrete box culvert forming device according to claim 5, characterized in that, Pins (8) are fixedly installed on both sides of the support plate (5). The pins (8) are used in conjunction with the U-shaped mounting block (7). The top of the two pins (8) is provided with locking holes (801). The locking holes (801) are used in conjunction with the locking rod (704).

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