Core mold structure capable of realizing quick drawing and stripping

Abstract

The utility model discloses a mandrel structure capable of realizing quick pulling and stripping, which is quickly stripped from a box girder after stripping and comprises mounting seats, moving devices and mandrels, the mounting seats are arranged on the mandrels at intervals, and the moving devices are detachably connected onto the mounting seats; the mounting seats are arranged on the inner surfaces of the bottom die and the side dies of the core die, the moving devices are located on the rear sides of the mounting seats, and the moving devices are aligned with the core die in the front-back direction and make contact with the inner surface of the box girder. The demolding core mold is separated from the surface of the box girder by a certain distance through the support of the moving device, and then the sliding friction between the core mold and the box girder is changed into rolling friction through the moving device, so that the core mold is conveniently and quickly pulled and separated, the efficiency is higher, the stability is stronger, the damage to the surface of the box girder is avoided, and the production cost is reduced. The integrity of concrete on the inner surface of the box girder is ensured.

Description

Technical Field

[0001] This utility model relates to the field of box girder prefabrication production technology, specifically to a core mold structure that enables quick pull-out. Background Technology

[0002] The dismantling of precast box girders and formwork is a crucial construction stage in bridge engineering, serving as a fundamental element and key step in ensuring the construction of the bridge deck system. Box girders are a type of beam in bridge engineering, available in various specifications such as single-box and multi-box configurations. Existing precast box girder molds typically have fixed formwork on both sides, making dismantling difficult and resulting in cumbersome demolding processes that hinder rapid demolding and may damage the surface integrity of the precast concrete beam. While existing technologies include numerous core mold demolding devices and methods, such as those proposed in CN113681701B and CN118456611A, which offer easier core mold demolding solutions, the removal of the core mold from the box girder after demolding generally relies on a traction device. This process is not only time-consuming and labor-intensive but also highly susceptible to damaging the box girder surface. This invention provides a core mold structure that enables rapid pull-out, solving the aforementioned problems. Utility Model Content

[0003] This utility model provides a core mold structure that enables quick pull-out. By detachably installing a moving device on the core mold, the quick operation of pulling out the core mold is realized, and the inner surface of the box girder is protected.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0005] A core mold structure for quick pull-out and release, which can be quickly released from the box girder after demolding, includes a mounting base, a moving device, and a core mold. The mounting base is spaced apart on the core mold, and the moving device is detachably connected to the mounting base. The mounting base is located on the inner surface of the bottom mold and side mold of the core mold, and the moving device is located on the rear side of the mounting base. The moving device is aligned front and back with the core mold and contacts the inner surface of the box girder.

[0006] The moving device includes a mounting rod, a connecting seat, moving wheels, a placement plate, and a connecting component. The mounting rod is detachably connected to the mounting seat and is located on the front side of the connecting seat. The placement plate is connected to the connecting seat via the connecting component. The moving wheels are located on the placement plate and contact the inner surface of the box girder.

[0007] Furthermore, the mounting base includes a mounting slot, a retaining plate, and a locking bolt. The mounting slot is fixedly mounted on the core mold, the locking bolt is movably mounted on the mounting slot, and the retaining plate is movably mounted on the inner end of the locking bolt and located in the mounting slot.

[0008] Furthermore, the bottom mold of the core mold is provided with an opening, and a sealing device is provided at the opening. The sealing device includes a baffle and a slide groove. The slide groove is fixedly provided on both sides of the opening, and the baffle is movably provided at the opening and located in the slide groove.

[0009] Furthermore, a mounting base is provided at the opening of the core mold, and a moving device is provided inside the opening of the core mold when the core mold is removed.

[0010] Furthermore, the connecting seat includes an upper plate, a vertical plate, and a lower plate, the upper plate and the lower plate are arranged in parallel, the vertical plate is located between the upper plate and the lower plate, and the connecting member is fixedly installed on the lower plate.

[0011] Furthermore, the card plate is provided with limiting pins, which are arranged in pairs on the bottom surface of the card plate, and the mounting rod is provided with limiting grooves, which are correspondingly arranged with the limiting pins.

[0012] Preferably, the connecting member is a pin hinge seat, and the movable wheel is a caster wheel.

[0013] The beneficial effects of this utility model are as follows:

[0014] The core mold is separated from the box girder surface by using a moving device to create a certain distance. Then, the moving device changes the sliding friction between the core mold and the box girder into rolling friction, which facilitates the quick pulling out of the core mold. This not only increases efficiency and stability but also avoids damage to the box girder surface and ensures the integrity of the concrete on the inner surface of the box girder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the extraction construction state of this utility model;

[0017] Figure 3 This is a schematic diagram of the box girder casting construction process of this utility model;

[0018] Figure 4 This is a schematic diagram showing the connection between the mounting base and the mobile device of this utility model.

[0019] Figure 5 This is a schematic diagram of the mounting base structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the mobile device structure of this utility model.

[0021] Reference numerals: 1. Mounting base; 11. Mounting slot; 12. Clamping plate; 13. Locking bolt; 2. Moving device; 21. Mounting rod; 22. Connecting seat; 23. Moving wheel; 24. Placement plate; 25. Connecting piece; 3. Core mold; 4. Sealing device. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0024] like Figure 1 , 2 As shown in Figure 3, a core mold structure for quick pull-out release, which can be quickly released from the box girder after demolding, includes a mounting base 1, a moving device 2, and a core mold 3. The mounting base 1 is spaced apart on the core mold 3 and located at the rear end of the core mold 3. The front end of the core mold 3 is connected to a traction device. The moving device 2 is detachably connected to the mounting base 1. The mounting base 1 is located on the inner surface of the bottom mold and side mold of the core mold 3. The moving device 2 is located on the rear side of the mounting base 1. The moving device 2 is aligned with the core mold 3 front and back and contacts the inner surface of the box girder.

[0025] like Figure 1 , 4As shown in Figure 6, the moving device 2 includes a mounting rod 21, a connecting seat 22, moving wheels 23, a placement plate 24, and a connecting piece 25. The mounting rod 21 is detachably connected to the mounting seat 1 and is used to connect the moving device 2 to the mounting seat 1. The mounting rod 21 is located on the front side of the connecting seat 22. The placement plate 24 is connected to the connecting seat 22 through the connecting piece 25. The placement plate 24 is located below the connecting seat 22. The connecting piece 25 is located between the connecting seat 22 and the placement plate 24. The connecting piece 25 is used to connect the connecting seat 22 and the placement plate 24 and to adjust the angle of the placement plate 24 and the moving wheels 23 so that they are flush with the surface of the core mold 3, thereby maintaining the stability of the core mold 3 during movement. The moving wheels 23 are arranged in groups on the placement plate 24 and contact the inner surface of the box girder. The moving wheels 23 play a supporting and rolling role, reducing friction and improving the convenience of pulling out the core mold.

[0026] like Figure 1 , 2 As shown in Figure 3, after demolding, the length of a single core mold 3 is relatively long. When it is pulled out of the box girder, the friction between the bottom surface of the core mold 3 and the inner surface of the box girder is extremely high, making it very difficult to pull out. Moreover, due to the large and uneven friction during the pulling process, the core mold 3 is very prone to shifting or tilting, which can damage the inner surface of the box girder. In this embodiment, the moving device 2 is used to support the core mold 3 and detach it from the surface of the box girder, so that the core mold 3 no longer contacts the inner surface of the box girder. Furthermore, the moving wheels 23 of the moving device 2 change the sliding friction to rolling friction, which greatly reduces the friction and makes it easier to pull out the core mold. At the same time, multiple sets of moving devices 2 are set up to strengthen the support of the core mold 3. Combined with the rolling movement by the moving wheels 23, the core mold 3 remains stable throughout the entire extraction process, avoiding shifting or tilting during extraction, thereby avoiding damage to the surface of the box girder and ensuring the integrity of the concrete on the inner surface of the box girder.

[0027] In specific setup, after the core mold 3 is demolded, it is ejected in a single piece. Mounting seats 1 are pre-installed on the core mold 3, and these seats are placed on the bottom and side molds. The moving device 2 is fixed in place via the mounting seats 1. The moving device 2 on the side molds maintains a certain distance between the side molds of the core mold 3 and the box girder, ensuring stability. The moving device 2 on the bottom mold provides support and movement. It supports and lifts the core mold 3, detaching it from the box girder surface. The rolling of the moving wheels 23 reduces friction and improves the stability of the ejection process, facilitating the complete extraction of the core mold. During movement, unstable traction may cause the core mold to shift. The moving device 2 on the side molds provides support and limits, preventing the core mold from tipping over. Simultaneously, the moving device 2 on the side molds also helps reduce friction, improving the ease of pulling out the core mold 3. The movable device 2 installed on the bottom mold of the core mold may deviate inward due to the traction force. Therefore, two movable devices 2 are installed on the bottom mold of the core mold. One movable device 2 is located at the rear end of the bottom mold, and the other movable device 2 is located in front of the first movable device 2. The two movable devices 2 work together to improve the stability of the core mold 3 when it moves. Since the movable device 2 needs to be installed on the crossbeam of the inner mold of the box girder to avoid damage to the surface concrete of the box girder, the two movable devices 2 installed on the bottom mold need to be aligned front and back. Therefore, an opening is made in the core mold 3 and a sealing device 4 is installed at the opening. When the core mold 3 is removed, the movable device 2 is installed through the opening. When the box girder is poured, the opening is sealed with the sealing device 4 to ensure the integrity of the core mold 3 and not affect the normal pouring operation of the box girder.

[0028] like Figure 4 , 6 As shown, the connecting seat 22 further includes an upper plate, a vertical plate and a lower plate. The upper plate and the lower plate are arranged in parallel. The vertical plate is located between the upper plate and the lower plate. The upper plate, the vertical plate and the lower plate are connected by welding. The connecting piece 25 is fixedly installed on the lower plate.

[0029] Preferably, the connecting member 25 is a pin hinge seat, which connects the placement plate 24 and the connecting seat 22 to achieve a movable connection between the placement plate 24 and the connecting seat 22. After the moving device 2 is installed through the mounting base 1, it cannot be guaranteed that the moving device 2 is completely parallel to the surface of the core mold 3. Therefore, the core mold may deviate during the pulling process. Therefore, the connecting member 25 is set to adjust the angle of the placement plate 24 so that the placement plate 24 is parallel to the surface of the core mold at its setting position, thereby ensuring that the core mold 3 will not deviate when moving. The connecting member 25 includes an upper pin seat and a lower pin seat. The upper pin seat and the lower pin seat are movably connected by a pin to achieve rotation around the axis of the pin. It is also equipped with a self-locking function to lock after adjustment. After the upper pin seat and the lower pin seat rotate relative to each other to a specified angle, the pin is locked by the self-locking function. The upper pin seat is welded to the bottom surface of the connecting seat 22, and the lower pin seat is welded to the surface of the placement plate 24.

[0030] like Figure 4 , 5 As shown, the mounting base 1 further includes a mounting slot 11, a locking plate 12, and a locking bolt 13. The mounting slot 11 is fixedly mounted on the core mold, and the locking bolt 13 is movably mounted on the mounting slot 11. The locking plate 12 is located at the inner end of the locking bolt 13 and is situated in the mounting slot 11. In the working state, the mounting rod 21 is inserted into the mounting slot 11, and the locking plate 12 moves up and down by rotating the locking bolt 13. After moving down into place, the locking plate 12 locks the mounting rod 21.

[0031] like Figure 5 , 6 As shown, the card plate 12 is further provided with a limiting pin, and the limiting pins are arranged in pairs on the bottom surface of the card plate 12. The mounting rod 21 is provided with a limiting groove, and the limiting groove and the limiting pin are correspondingly arranged. When the mounting rod 21 is installed, the limiting pin is inserted into the limiting groove to limit and lock the mounting rod 21, so as to prevent the mounting rod 21 from shifting, and at the same time, it also improves the connection stability.

[0032] Preferably, the locking bolt 13 and the mounting slot 11 are connected by threads and achieve self-locking. By rotating the locking bolt 13, its height can be adjusted, thereby moving the clamping plate 12 downward and clamping the mounting rod 21. The locking bolt 13 and the clamping plate 12 are connected by a bearing, so that the direction of the clamping plate 12 is stable when the locking bolt 13 rotates.

[0033] like Figure 1 , 2As shown in Figure 3, further, the bottom mold of the core mold 3 has an opening, and a sealing device 4 is provided at the opening. The sealing device 4 includes a baffle and a slide groove. The slide groove is fixedly arranged on both sides of the opening, and the baffle is movably arranged at the opening and located in the slide groove. The baffle includes a retaining plate and a sealing plate. The sealing plate corresponds to the opening on the outer surface of the bottom mold of the core mold and blocks it. The sealing plate is connected to the retaining plate, and the retaining plate is stuck in the slide groove, thereby fixing the baffle in the opening on the bottom mold of the core mold. The slide groove is provided with a slope for installing the baffle to facilitate the insertion of the baffle. During pouring, the baffle is inserted into the slide groove and tightened with bolts to block the opening on the bottom mold of the core mold.

[0034] Furthermore, a mounting base 1 is provided at the opening of the core mold 3. When the core mold 3 is removed, the moving device 2 is installed at the opening using the mounting base 1.

[0035] Preferably, the movable wheels 23 are omnidirectional wheels, which are arranged in groups on the placement plate 24.

[0036] The specific method of using this utility model includes the following steps:

[0037] S1, Prefabricated components: The mounting base 1 and the moving device 2 are prefabricated according to the specific structure of the core mold 3. The mounting base 1 and the moving device 2 are prefabricated by welding connection. An opening is made on the bottom mold of the core mold 3 and a sealing device 4 is installed. The mounting base 1 is pre-welded to the corresponding position of the core mold. A total of three mounting bases 1 are installed. One mounting base 1 is set at the rear end of the bottom mold, one mounting base 1 is set at the rear end of the side mold, and one mounting base 1 is set at the opening of the bottom mold.

[0038] S2, Core mold demolding: After the box girder construction is completed and reaches the predetermined strength, the outer mold of the precast box girder is first removed to expose the core mold 3 and demold the core mold 3. After the core mold 3 is separated from the box girder, the core mold is pried with a tool to leave a gap between it and the box girder to facilitate the installation of the moving device 2.

[0039] S3, Install components: Open the sealing device 4 to expose the opening, then connect and assemble the prefabricated moving device 2 with the mounting base 1, and lock the moving device 2. Then adjust the connecting piece 2 so that the moving device 2 is flush with the core mold 3. After the adjustment is completed, lock the connecting piece 2 to achieve the stability of the moving device 2.

[0040] S4, core mold extraction: Connect the traction device to the front end of the core mold, and then drive the traction device to pull the core mold 3 forward until the entire core mold 3 is pulled out. After the core mold 3 is pulled out, remove the moving device 2 and install and fix the sealing device 4.

[0041] S5, Repeat the operation: Following the steps of S2-S4, extract the remaining core molds 3. Once all core molds 3 have been extracted, the operation is complete.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A core mold structure for quick pull-out and release, which can be quickly released from the box girder after demolding, characterized in that: The device includes a mounting base (1), a moving device (2), and a core mold (3). The mounting base (1) is spaced apart on the core mold (3), and the moving device (2) is detachably connected to the mounting base (1). The mounting base (1) is located on the inner surface of the bottom mold and the side mold of the core mold (3). The moving device (2) is located on the rear side of the mounting base (1). The moving device (2) is aligned with the core mold (3) front and back and contacts the inner surface of the box girder. The moving device (2) includes a mounting rod (21), a connecting seat (22), a moving wheel (23), a placement plate (24), and a connector (25). The mounting rod (21) is detachably connected to the mounting seat (1). The mounting rod (21) is located on the front side of the connecting seat (22). The placement plate (24) is connected to the connecting seat (22) through the connector (25). The moving wheel (23) is located on the placement plate (24) and contacts the inner surface of the box girder.

2. The core mold structure for quick pull-out and release according to claim 1, characterized in that: The mounting base (1) includes a mounting slot (11), a retaining plate (12) and a locking bolt (13). The mounting slot (11) is fixedly mounted on the core mold. The locking bolt (13) is movably mounted on the mounting slot (11). The retaining plate (12) is movably mounted on the inner end of the locking bolt (13) and is located in the mounting slot (11).

3. The core mold structure for quick pull-out and release according to claim 1, characterized in that: The bottom mold of the core mold (3) has an opening, and a sealing device (4) is provided at the opening. The sealing device (4) includes a baffle and a slide groove. The slide groove is fixedly provided on both sides of the opening, and the baffle is movably provided at the opening and located in the slide groove.

4. The core mold structure for quick pull-out and release according to claim 1, characterized in that: The core mold (3) has an installation base (1) at its opening. When the core mold (3) is removed, a moving device (2) is installed inside the opening of the core mold (3).

5. The core mold structure for quick pull-out and release according to claim 1, characterized in that: The connecting seat (22) includes an upper plate, a vertical plate and a lower plate. The upper plate and the lower plate are arranged in parallel. The vertical plate is located between the upper plate and the lower plate. The connecting piece (25) is fixedly installed on the lower plate.

6. The core mold structure for quick pull-out and release according to claim 2, characterized in that: The card plate (12) is provided with a limiting pin, and the limiting pins are arranged in pairs on the bottom surface of the card plate (12). The mounting rod (21) is provided with a limiting groove, and the limiting groove and the limiting pin are arranged accordingly.

7. The core mold structure for quick pull-out and release according to claim 1, characterized in that: The connector (25) is a pin hinge seat, and the movable wheel (23) is a universal wheel.

Images