A jacking device and leakage-proof structure for karst cave pile foundation pouring

Abstract

The application discloses a jacking device and leakage-proof structure for karst cave pile foundation pouring, and relates to the technical field of pile foundation pouring, which comprises a shell, a push block, a first elastic component, a jacking rod, a second elastic component, a first locking component and a second locking component; the push block is arranged in the shell; the first elastic component is in transmission connection with the push block; the jacking rod is inserted into the shell; the second elastic component is in transmission connection with the jacking rod; the first locking component is connected with the push block, and the first locking component can prevent the push block from moving when the first locking component is in a locking state; the second locking component is connected with the jacking rod, and the second locking component can prevent the jacking rod from moving when the second locking component is in a locking state. The jacking device and leakage-proof structure for karst cave pile foundation pouring can support a karst cave sealing plate in the case of lacking power and complete pile foundation pouring.

Description

Technical Field

[0001] This invention relates to the field of pile foundation casting technology, and in particular to a jacking device and leak-proof structure for casting pile foundations in karst caves. Background Technology

[0002] In engineering construction, such as bridge construction, pile foundations need to be driven into the ground. In some special geographical environments, after the pile holes are excavated, karst caves may be encountered. In this case, the boundary of the karst cave may happen to intersect with the pile hole, causing concrete to flow into the karst cave when the concrete is poured to form the pile foundation. In this situation, the concrete will first fill the karst cave and then fill the pile hole to form the pile foundation, resulting in a large amount of wasted concrete.

[0003] Hydraulic support devices also exist in related technologies. For example, in document CN212506236U, an electro-hydraulic rod is used to support an arc-shaped protective steel plate, which is then used to cover the entrance of the karst cave to prevent concrete from entering. However, in some construction environments, it is difficult to transport energy supply equipment and power equipment. The electro-hydraulic rod cannot be driven in the absence of power and is easily affected by the environment. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a jacking device for the pouring of pile foundations in karst caves, which can support the karst cave sealing plate and complete the pile foundation pouring even in the absence of power.

[0005] The present invention also proposes a leak-proof structure for the pouring of pile foundations in karst caves.

[0006] A lifting device for pouring pile foundations in karst caves according to a first aspect of the present invention includes a housing; A pusher block, wherein the pusher block is disposed inside the housing; A first elastic component is connected to the push block via a transmission connection. A push rod is inserted into the housing; The second elastic component is connected to the push rod drive; A first locking component is connected to the push block, and when the first locking component is in a locked state, it can prevent the push block from moving. A second locking assembly is connected to the top rod, and when the second locking assembly is in a locked state, it can prevent the top rod from moving. The lifting device has an initial state, a lifting state, and a retraction state. In the initial state, both the first and second elastic components are configured to store energy, and both the first and second locking components are configured to lock. In the lifting state, the second locking component is configured to unlock, and the second elastic component drives the push rod to extend to the outside of the housing. In the retraction state, the first locking component is configured to unlock, and the first elastic component drives the push block to move and abut against the push rod, and moves the push rod toward the inside of the housing to retract.

[0007] The jacking device for karst cave pile foundation pouring according to an embodiment of the present invention has at least the following beneficial effects: when the jacking device is lowered to the sealing plate in the pile hole, an action is applied to the second locking component, and the second elastic component drives the push rod to extend to the outside of the shell. One end of the push rod abuts against the sealing plate, and the end of the shell away from the push rod abuts against the inner wall of the pile hole, thus completing the support and fixation of the sealing plate; when the concrete is poured to a certain depth submerging the sealing plate, an action is applied to the first locking component, and the first elastic component drives the push block to move and abut against the push rod, and moves the push rod toward the inside of the shell to retract. The push rod no longer supports the sealing plate, and at this time the jacking device can be lifted and retrieved. The jacking device is a purely mechanical structure, which can support the karst cave sealing plate and complete the pile foundation pouring without external power.

[0008] According to some embodiments of the present invention, the housing is provided with a first guide cavity and a second guide cavity that are parallel to each other. The push block is disposed in the first guide cavity, the push rod is inserted into the second guide cavity, the push rod is provided with a stop block that extends into the first guide cavity. In the lifting state, the second elastic component drives the push rod to move in a first direction. In the retracting state, the first elastic component drives the push block to move in a second direction, the first direction being opposite to the second direction.

[0009] According to some embodiments of the present invention, the first elastic component is a first spring, the second elastic component is a second spring, the housing has a first end and a second end opposite to each other, the first spring is disposed in the first guide cavity and located at the first end, one end of the first spring is fixed to the housing, and the other end of the first spring is fixed to the push block, the second spring is disposed in the second guide cavity and located at the second end, one end of the second spring is fixed to the housing, and the other end of the second spring is fixed to the push rod, and in the initial state, both the first spring and the second spring are configured in a compressed state.

[0010] According to some embodiments of the present invention, the second locking assembly includes a second slot, a second limiting hole, and a second locking block. The second slot is disposed on the side wall of the top rod, and the second limiting hole is disposed in the housing and extends to the second guide cavity. In the locked state, the second locking block passes through the second limiting hole and is engaged in the second slot.

[0011] According to some embodiments of the present invention, the second locking assembly further includes a third spring, one end of which is connected to the housing and the other end of which is connected to the second locking block. The third spring is configured to drive the second locking block to maintain a tendency to move toward the second locking slot.

[0012] According to some embodiments of the present invention, the first locking component includes a first slot, a first limiting hole, and a first locking block. The first slot is disposed on the side wall of the push block, and the first limiting hole is disposed on the housing and extends to the first guide cavity. In the locked state, the first locking block passes through the first limiting hole and is locked in the first slot.

[0013] According to some embodiments of the present invention, the side wall of the first locking block is provided with an anti-disengagement groove, and the protruding end of the top rod is provided with an insertion rod. In the initial state, the insertion rod is inserted into the anti-disengagement groove to prevent the first locking block from moving, and in the lifting state, the insertion rod is disengaged from the anti-disengagement groove.

[0014] According to some embodiments of the present invention, the protruding end of the push rod is provided with a pressure plate, and the surface of the pressure plate away from the push rod is provided with a plurality of protruding pressure blocks.

[0015] According to some embodiments of the present invention, a top plate is provided on the outer side of the housing away from the protruding end of the top rod, and the top plate has an arc-shaped surface.

[0016] According to a second aspect of the present invention, a leak-proof structure for pouring karst cave pile foundations includes a cylindrical metal cage, a sealing plate, and the aforementioned jacking device for pouring karst cave pile foundations. The metal cage is placed inside the pile hole, the sealing plate is placed in the pile hole and is used to cover the karst cave opening inside the pile hole, one end of the jacking device abuts against the sealing plate, and the other end of the jacking device abuts against the metal cage.

[0017] The anti-leakage structure for karst cave pile foundation pouring according to embodiments of the present invention has at least the following beneficial effects: When the lifting device is lowered to the sealing plate in the pile hole, an action is applied to the second locking component. The second elastic component drives the push rod to extend to the outside of the shell. One end of the push rod abuts against the sealing plate, and the end of the shell away from the push rod abuts against the metal cage inside the pile hole, thus completing the support and fixation of the sealing plate. When the concrete is poured to a certain depth submerging the sealing plate, an action is applied to the first locking component. The first elastic component drives the push block to move and abut against the push rod, and moves the push rod towards the inside of the shell to retract. The push rod no longer supports the sealing plate. At this time, the lifting device can be lifted and retrieved. The lifting device is a purely mechanical structure, capable of supporting the karst cave sealing plate and completing the pile foundation pouring without external power. The sealing plate covers the karst cave opening, minimizing the entry of concrete into the karst cave and greatly reducing unnecessary waste.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a jacking device used for pouring pile foundations in karst caves, according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of a jacking device used for pouring karst pile foundations according to an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the second locking component in an embodiment of the present invention; Figure 4 This is a partial cross-sectional view of the first locking component in an embodiment of the present invention; Figure 5 This is a schematic diagram of a leak-proof structure for karst cave pile foundation pouring according to an embodiment of the present invention.

[0020] Icon labels: The components include: housing 100, first guide cavity 110, second guide cavity 120, push block 200, first elastic component 300, top rod 400, stop block 410, insertion rod 420, pressure plate 430, pressure block 431, top plate 440, second elastic component 500, first locking component 600, first slot 610, first limiting hole 620, first locking block 630, anti-disengagement groove 631, second locking component 700, second slot 710, second limiting hole 720, second locking block 730, third spring 740, metal cage 800, and sealing plate 900. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element 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 invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] As described in the background section, some construction environments are restricted from using external power equipment. In order to support the karst cave entrance inside the sealing plate blocking pile hole in a powerless environment, it is necessary to develop a jacking device with a purely mechanical structure.

[0026] Reference Figure 1 and Figure 2 As shown, a lifting device for karst pile foundation pouring according to an embodiment of the present invention includes a housing 100, a push block 200, a first elastic component 300, a top rod 400, a second elastic component 500, a first locking component 600, and a second locking component 700.

[0027] A push block 200 is disposed inside the housing 100; a first elastic component 300 is operatively connected to the push block 200; a push rod 400 is inserted into the housing 100; a second elastic component 500 is operatively connected to the push rod 400; a first locking component 600 is connected to the push block 200, and when the first locking component 600 is in a locked state, it can prevent the push block 200 from moving; a second locking component 700 is connected to the push rod 400, and when the second locking component 700 is in a locked state, it can prevent the push rod 400 from moving; wherein, the lifting device has an initial state, a lifting state, and a retraction state. In the initial state, both the first elastic component 300 and the second elastic component 500 are configured in an energy storage state, and both the first locking component 600 and the second locking component 700 are configured in a locked state. In the lifting state, the second locking component 700 is configured in an unlocked state, and the second elastic component 500 drives the push rod 400 to extend to the outside of the housing 100. In the retraction state, the first locking component 600 is configured in an unlocked state, and the first elastic component 300 drives the push block 200 to move and abut against the push rod 400, and moves the push rod 400 toward the inside of the housing 100 to retract.

[0028] When using the jacking device for pouring karst cave pile foundations according to the embodiment, the jacking device is in its initial state, i.e., the jacking rod 400 is not extended. First, the necessary components for pouring the pile hole are placed in the pile hole, such as a metal cage and a sealing plate. The position of the sealing plate is adjusted so that it completely covers the opening of the karst cave in the pile hole. Then, the jacking device is lowered to the position of the sealing plate. It should be understood that the jacking device can be hoisted to the position of the sealing plate using chains or steel ropes. Specifically, several lifting lugs can be provided on the outer surface of the housing 100 to facilitate the connection of the chains or steel ropes to the lifting lugs.

[0029] After the lifting device is placed in the position of the sealing plate, the second locking component 700 is activated, that is, the lifting device is adjusted to the lifting state. At this time, the second locking component 700 is in the unlocked state. The top rod 400 is no longer restricted by the second locking component 700, and the second elastic component 500 no longer remains in the energy storage state. The second elastic component 500 can drive the top rod 400 to move to extend to the outside of the housing 100 until the top rod 400 contacts and abuts against the sealing plate. At the same time, the end of the housing 100 away from the top rod 400 will also abut against the inner wall of the pile hole, thereby fixing the sealing plate.

[0030] After the sealing plate is fixed, concrete pouring can be carried out in the pile hole. When the concrete in the pile hole is poured to the position of the sealing plate and the concrete submerges the sealing plate to a predetermined height, the concrete can fix the sealing plate. At this time, the first locking component 600 is activated, and the lifting device is adjusted to the retraction state. At this time, the first locking component 600 is in the unlocked state, the push block 200 is no longer restricted by the first locking component 600, the first elastic component 300 no longer maintains the energy storage state, and the first elastic component 300 can drive the push block 200 to move and abut against the top rod 400, and move the top rod 400 toward the inside of the housing 100 to retract. That is, the top rod 400 no longer supports the sealing plate, and the lifting device can be lifted and retracted.

[0031] It is important to understand that when the first elastic component 300 and the second elastic component 500 are in an energy storage state, they both require external force to maintain this state. For example, the first locking component 600 restricts the movement of the push block 200, preventing the first elastic component 300 from releasing energy to drive the push block 200. Specifically, taking a spring as an example, when a spring is in a compressed or stretched state, it is in an energy storage state and tends to return to its default state.

[0032] It is understood that the housing 100 has a first guide cavity 110 and a second guide cavity 120 that are parallel to each other. The push block 200 is disposed in the first guide cavity 110, and the push rod 400 is inserted into the second guide cavity 120. The push rod 400 is provided with a stop block 410 that extends into the first guide cavity 110. In the lifting state, the second elastic component 500 drives the push rod 400 to move in the first direction. In the retracting state, the first elastic component 300 drives the push block 200 to move in the second direction. The first direction is opposite to the second direction.

[0033] The first guide cavity 110 serves both to accommodate the push block 200 and to guide its movement. Similarly, the second guide cavity 120 serves both to accommodate the push rod 400 and to guide its movement.

[0034] The push rod 400 and the stop block 410 can be a single integrated structure or two parts assembled and fixed together, such as by welding. Regardless of how the stop block 410 is set, it can be considered as part of the push rod 400. The stop block 410 extends into the first guide cavity 110, meaning the stop block 410 is on the movement path of the push block 200. The first direction and the second direction are defined as opposite, meaning the movement directions of the stop block 410 and the push block 200 are opposite. In the lifting state, the push rod 400 moves towards the first direction, and the stop block 410 moves towards the push block 200 to approach it. In the retraction state, the push block 200 moves towards the second direction, and the push block 200 abuts against the stop block 410 and pushes the stop block 410 to move towards the second direction, completing the retraction of the push rod 400.

[0035] It is understood that the first elastic component 300 is a first spring, the second elastic component 500 is a second spring, the housing 100 has a first end and a second end opposite to each other, the first spring is disposed in the first guide cavity 110 and located at the first end, one end of the first spring is fixed to the housing 100, and the other end of the first spring is fixed to the push block 200, the second spring is disposed in the second guide cavity 120 and located at the second end, one end of the second spring is fixed to the housing 100, and the other end of the second spring is fixed to the push rod 400. In the initial state, both the first spring and the second spring are configured to be in a compressed state.

[0036] When the first and second springs are in a completely opposite position, and the compressed first and second springs reset, they can drive the push block 200 and the top rod 400 to move in opposite directions, respectively. Specifically, when the second locking assembly 700 is in the unlocked state, the movement of the top rod 400 is not restricted by the second locking assembly 700, and the compressed second spring will reset, that is, the second spring pushes the top rod 400 from the second end toward the first end, defined as moving in the first direction, and the lifting device is in the lifting state. When the first locking assembly 600 is in the unlocked state, the movement of the push block 200 is not restricted by the first locking assembly 600, and the compressed first spring will reset, that is, the first spring pushes the push block 200 from the first end toward the second end, defined as moving in the second direction, and the lifting device is in the retraction state. The push block 200 will abut against the stop block 410 and push the stop block 410 to move in the second direction, retracting the top rod 400 toward the inside of the housing 100.

[0037] It should be understood that the second spring can also be set to a stretched state, which is also configured as an energy storage state. When the second spring is set to a stretched state, the second spring should also be located at the first end of the housing 100. One end of the second spring is connected to the housing 100, and after stretching, the other end of the second spring is connected to the side of the push rod 400 near the second end. At this time, when the second spring is reset, it will pull the push rod 400 from the second end toward the first end.

[0038] Reference Figure 3 As shown, it can be understood that the second locking assembly 700 includes a second slot 710, a second limiting hole 720, and a second locking block 730. The second slot 710 is disposed on the side wall of the top rod 400, and the second limiting hole 720 is disposed in the housing 100 and extends to the second guide cavity 120. In the locked state, the second locking block 730 passes through the second limiting hole 720 and is engaged in the second slot 710.

[0039] On one hand, the second locking block 730 contacts the second locking groove 710. On the other hand, the second locking block 730 contacts the second limiting hole 720. The second limiting hole 720 is fixed on the housing 100. The second locking block 730 is restricted by the second limiting hole 720. The push rod 400 is restricted by the second locking block 730, so the push rod 400 cannot move. When the second locking block 730 is engaged in the second locking groove 710, the second locking assembly 700 is in a locked state.

[0040] When the second locking block 730 moves out of the second locking slot 710, the top rod 400 is no longer restricted by the second locking block 730, and the second locking component 700 is in the unlocked state. It should be understood that, to facilitate the removal of the second locking block 730 from the second locking slot 710, a traction rope can be installed on the second locking block 730. The operator can then pull the traction rope from outside the pile hole to remove the second locking block 730 from the second locking slot 710.

[0041] Understandably, the second locking assembly 700 also includes a third spring 740, one end of which is connected to the housing 100 and the other end of which is connected to the second latch 730. The third spring 740 is configured to drive the second latch 730 to maintain a tendency to move toward the second latch 710.

[0042] Because the third spring 740 exerts a force on the second locking block 730, the second locking block 730 tends to move toward the second locking slot 710, thus preventing accidental premature activation of the lifting device when placing it. It should be understood that since moving the second locking block 730 requires overcoming the elastic force of the third spring 740, pulling the traction rope of the second locking block 730 will raise the housing 100. At this point, a rigid support rod can be used, inserted into the pile hole until it contacts the housing 100. The support rod prevents the housing 100 from rising, and in conjunction with pulling the traction rope of the second locking block 730, moves the second locking block 730 out of the second locking slot 710, triggering the lifting device to the lifting state.

[0043] Reference Figure 4As shown, it can be understood that the first locking component 600 includes a first slot 610, a first limiting hole 620, and a first locking block 630. The first slot 610 is disposed on the side wall of the push block 200, and the first limiting hole 620 is disposed on the housing 100 and extends to the first guide cavity 110. In the locked state, the first locking block 630 passes through the first limiting hole 620 and is locked in the first slot 610.

[0044] Similar to the second locking assembly 700, on one hand, the first locking block 630 contacts the first locking groove 610, and on the other hand, the first locking block 630 contacts the first limiting hole 620. The first limiting hole 620 is fixed on the housing 100. The first locking block 630 is restricted by the first limiting hole 620, and the push block 200 is restricted by the first locking block 630. Therefore, the push block 200 cannot move. When the first locking block 630 is engaged in the first locking groove 610, the first locking assembly 600 is in a locked state.

[0045] When the first locking block 630 moves out of the first locking slot 610, the push block 200 is no longer restricted by the first locking block 630, and the first locking component 600 is in the unlocked state. Similarly, to facilitate the removal of the first locking block 630 from the first locking slot 610, a traction rope can be installed on the first locking block 630. The operator can pull the traction rope on the first locking block 630 from outside the pile hole to remove the first locking block 630 from the first locking slot 610.

[0046] Reference Figure 5 As shown, it can be understood that the side wall of the first locking block 630 is provided with an anti-disengagement groove 631, and the extended end of the top rod 400 is provided with an insertion rod 420. In the initial state, the insertion rod 420 is inserted into the anti-disengagement groove 631 to prevent the first locking block 630 from moving. In the lifting state, the insertion rod 420 is disengaged from the anti-disengagement groove 631.

[0047] To prevent the lifting device from prematurely switching to the retracted state due to contact with the first locking block 630, which would prevent the push rod 400 from extending outside the housing 100, the insertion rod 420, in cooperation with the anti-disengagement groove 631, can prevent the first locking block 630 from moving out of the first locking groove 610. It is important to understand that the insertion rod 420 is located at the extended end of the push rod 400. In the initial state, the push rod 400 does not extend outside the housing 100, and the insertion rod 420 is inserted into the anti-disengagement groove 631. Only in the lifting state, when the push rod 400 extends outside the housing 100, i.e., the insertion rod 420 moves away from the first locking block 630 as the push rod 400 moves, and the insertion rod 420 leaves the anti-disengagement groove 631, can the first locking block 630 be moved to unlock the push block 200, switching the lifting device to the retracted state.

[0048] It is understandable that the extended end of the push rod 400 is provided with a pressure plate 430, and the surface of the pressure plate 430 away from the push rod 400 is provided with a plurality of protruding pressure blocks 431.

[0049] The extended end of the top rod 400 is generally used to contact and support the sealing plate, which is usually located on the outside of the metal cage. The lifting device is hoisted from the inside of the metal cage to the position of the sealing plate. Therefore, in order to ensure good contact between the extended end of the top rod 400 and the sealing plate, a pressure plate 430 is provided at the extended end of the top rod 400. At the same time, multiple protruding pressure blocks 431 are provided on the surface of the pressure plate 430. The pressure blocks 431 can pass through the mesh of the metal cage and contact the sealing plate.

[0050] It is understood that a top plate 440 is provided on the outer side of the housing 100 away from the protruding end of the top rod 400, and the top plate 440 has an arc-shaped surface.

[0051] When the push rod 400 abuts against the support sealing plate, the side of the housing 100 away from the protruding end of the push rod 400 will also abut against the inner wall of the metal cage. A top plate 440 is provided on the outer side of the housing 100, and the top plate 440 has an arc-shaped surface, which can increase the contact surface between the top plate 440 and the metal cage, and further improve the support stability of the lifting device.

[0052] An embodiment of the present invention provides a leak-proof structure for the pouring of karst cave pile foundations, comprising a cylindrical metal cage 800, a sealing plate 900, and the aforementioned jacking device for the pouring of karst cave pile foundations. The metal cage 800 is placed inside the pile hole, the sealing plate 900 is placed in the pile hole and is used to cover the karst cave opening inside the pile hole, one end of the jacking device abuts against the sealing plate 900, and the other end of the jacking device abuts against the metal cage 800.

[0053] First, the pile hole is excavated. When the pile hole intersects with a karst cave, the inner wall of the pile hole will contain the entrance to the karst cave. A sealing plate 900 is then hoisted into the pile hole to cover the karst cave entrance. It's important to understand that the sealing plate 900 should be slightly larger than the karst cave entrance, and it can be designed with an arc shape to match the arc of the pile hole, resulting in better sealing of the karst cave. Preferably, multiple lifting lugs are provided at the upper end of the sealing plate 900 for easy hoisting. After the sealing plate 900 is in place, it is kept in a hoisted state, and then a metal cage 800 is placed into the pile hole. It should be understood that the metal cage 800 is often a reinforced steel cage.

[0054] Next, the lifting device, in its initial state, is lowered into the pile hole. When the lifting device is at the position of the sealing plate 900, the second locking component 700 is operated. The second locking component 700 releases the restriction on the top rod 400, and the second elastic component 500 drives the top rod 400 to extend outward toward the outside of the housing 100 and contact the sealing plate 900. The other side of the housing 100 contacts and abuts against the metal cage 800, completing the support for the sealing plate 900. At this point, the lifting of the sealing plate 900 can be unloaded. Supported by the lifting device, the sealing plate 900 completely seals the entrance to the karst cave, allowing concrete to be poured into the pile hole.

[0055] After the concrete has submerged the sealing plate 900 to a certain height, the first locking component 600 can be operated. The first locking component 600 releases the restriction on the push block 200, and the first elastic component 300 drives the push block 200 to move and abut against the top rod 400, moving the top rod 400 toward the inside of the housing 100 and retracting it. The lifting device releases its support on the sealing plate 900, and the lifting device can be lifted and retrieved.

[0056] It should be understood that the lifting device in the retracted state can apply an external force to the lifting rod 400, causing the lifting rod 400 to move towards the outside of the housing 100. Since the push block 200 is in contact with the lifting rod 400 at this time, the movement of the lifting rod 400 towards the outside of the housing 100 is opposite to the direction in which the first elastic component 300 drives the push block 200 to move. The lifting rod 400 will drive the push block 200 to move to overcome the driving force of the first elastic component 300, reconfigure the first elastic component 300 into an energy storage state, and then operate the first locking component 600 to re-lock in the locked state, restricting the movement of the push block 200. Then, an external force is applied to the top rod 400, causing it to move toward the inside of the housing 100 to retract. At this time, the direction of movement of the top rod 400 is opposite to the direction of movement of the second elastic component 500 driving the top rod 400, which can overcome the driving force of the second elastic component 500 and reconfigure the second elastic component 500 into an energy storage state. Then, the second locking component 700 is operated to re-lock into a locked state, restricting the movement of the top rod 400. The lifting device is then reset to its initial state.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A jacking device for pouring pile foundations in karst caves, characterized in that, include: The housing has a first guide cavity and a second guide cavity that are parallel to each other inside the housing. A pusher block, wherein the pusher block is disposed in the first guide cavity; A first elastic component is connected to the push block via a transmission connection. A push rod is inserted into the second guide cavity, and the push rod is provided with a stop block that extends into the first guide cavity; The second elastic component is connected to the push rod drive; A first locking component is connected to the push block, and when the first locking component is in a locked state, it can prevent the push block from moving. A second locking assembly is connected to the top rod, and when the second locking assembly is in a locked state, it can prevent the top rod from moving. The lifting device has an initial state, a lifting state, and a retraction state. In the initial state, both the first elastic component and the second elastic component are configured in an energy storage state, and both the first locking component and the second locking component are configured in a locking state. In the lifting state, the second locking component is configured to be unlocked, the second elastic component drives the top rod to move in the first direction and extend to the outside of the housing, and the stop block moves toward the push block to approach the push block; In the retraction state, the first locking component is configured to be unlocked, and the first elastic component drives the pusher to move in the second direction to abut against the stop block and pushes the stop block to move in the second direction, causing the push rod to retract towards the inside of the housing, thus completing the retraction of the push rod. The first direction is opposite to the second direction.

2. The jacking device for pouring pile foundations in karst caves according to claim 1, characterized in that, The first elastic component is a first spring, and the second elastic component is a second spring. The housing has a first end and a second end opposite to each other. The first spring is disposed in the first guide cavity and located at the first end. One end of the first spring is fixed to the housing, and the other end of the first spring is fixed to the push block. The second spring is disposed in the second guide cavity and located at the second end. One end of the second spring is fixed to the housing, and the other end of the second spring is fixed to the push rod. In the initial state, both the first spring and the second spring are configured to be in a compressed state.

3. The jacking device for pouring pile foundations in karst caves according to claim 1, characterized in that, The second locking assembly includes a second slot, a second limiting hole, and a second locking block. The second slot is disposed on the side wall of the top rod, and the second limiting hole is disposed in the housing and extends to the second guide cavity. In the locked state, the second locking block passes through the second limiting hole and is locked in the second slot.

4. The jacking device for pouring pile foundations in karst caves according to claim 3, characterized in that, The second locking assembly further includes a third spring, one end of which is connected to the housing and the other end of which is connected to the second locking block. The third spring is configured to drive the second locking block to maintain a tendency to move toward the second locking slot.

5. The jacking device for pouring pile foundations in karst caves according to claim 1, characterized in that, The first locking component includes a first slot, a first limiting hole, and a first locking block. The first slot is disposed on the side wall of the push block, and the first limiting hole is disposed on the housing and extends to the first guide cavity. In the locked state, the first locking block passes through the first limiting hole and is locked in the first slot.

6. The jacking device for pouring pile foundations in karst caves according to claim 5, characterized in that, The first locking block has an anti-disengagement groove on its side wall, and the extended end of the top rod has an insertion rod. In the initial state, the insertion rod is inserted into the anti-disengagement groove to prevent the first locking block from moving. In the lifting state, the insertion rod is disengaged from the anti-disengagement groove.

7. The jacking device for pouring pile foundations in karst caves according to claim 1, characterized in that, The extended end of the push rod is provided with a pressure plate, and the surface of the pressure plate away from the push rod is provided with a plurality of protruding pressure blocks.

8. The jacking device for pouring pile foundations in karst caves according to claim 1, characterized in that, A top plate is provided on the outer side of the housing away from the protruding end of the top rod, and the top plate has an arc-shaped surface.

9. A leak-proof structure for pouring pile foundations in karst caves, characterized in that, The invention includes a cylindrical metal cage, a sealing plate, and a jacking device for pouring karst cave pile foundations as described in any one of claims 1 to 8. The metal cage is placed inside the pile hole, the sealing plate is placed in the pile hole and used to cover the karst cave opening inside the pile hole, one end of the jacking device abuts against the sealing plate, and the other end of the jacking device abuts against the metal cage.

Images