Karst cave pile foundation construction method and construction device

Abstract

This invention belongs to the field of pile foundation construction technology, specifically a method and device for constructing karst cave pile foundations, including a pile body one and a pile body two; reinforcing ribs are welded between the pile body one and the pile body two; multiple reinforcing ribs are arranged in a circular array between the pile body one and the pile body two; the pile body one, the pile body two, and the reinforcing ribs are all made of stainless steel; both the pile body one and the pile body two have a hollow design; cement containers are placed inside both the pile body one and the pile body two; multiple embedded rods are provided on the outer circumference of the pile body two; through the pile body one, the pile body two, and the cement containers in this embodiment of the invention, the strength of the hole after drilling is improved, and the cement in the cement containers will adaptively fill the reinforcing ribs and one side of the hole, the cavity of the karst cave can be filled densely, the filling material can be consolidated with the surrounding environment into a whole, and has a certain strength, which facilitates the subsequent construction of pile foundation projects.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation construction technology, specifically a method and device for constructing karst cave pile foundations. Background Technology

[0002] The purpose of karst cave treatment is to ensure that the cavity of the karst cave can be filled densely, that the filling material can be consolidated with the surrounding environment into a whole, and that it has a certain strength, and to cut off the connection between the cave and groundwater and karst water, so that it will no longer develop, in order to ensure the safe and smooth construction of the subsequent pile foundation project.

[0003] When treating karst caves, in order to ensure that there is no grout leakage during the construction of bored piles in karst-developed areas, or that there is grout leakage but no collapse of the hole, and to ensure that the pile hole is successfully formed and the pile meets the bearing capacity requirements, the geological conditions of the karst cave, the size of the cavity, and the filling material of the karst cave should be determined based on the geological conditions that have been investigated.

[0004] Currently, after drilling a hole in a karst cave, mortar is usually directly poured into the hole and then flows into the cave. However, this method is only suitable for sections with thick and hard cave walls. If there are some interconnected thin-layered deep caves, and only mortar is simply poured in, there is a high possibility that the cave walls will experience uneven stress during the mortar pouring process, leading to collapse and affecting the construction of subsequent pile foundation projects.

[0005] Therefore, the present invention provides a method and apparatus for constructing karst cave pile foundations. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A karst cave pile foundation construction device of this invention includes a pile body one and a pile body two; reinforcing ribs are welded between the pile body one and the pile body two; multiple reinforcing ribs are arranged in a circular array between the pile body one and the pile body two; the pile body one, the pile body two, and the reinforcing ribs are all made of stainless steel; both the pile body one and the pile body two have a hollow design; cement containers are placed inside both the pile body one and the pile body two; multiple embedded rods are arranged in a circular array on the outer circumference of the pile body two; multiple reinforcing mechanisms are arranged on the outer circumference of the pile body two to reinforce the pile body one and the pile body two.

[0008] Preferably, the bottom of the embedded rod is conical, the material of the embedded rod is stainless steel, and the bottom of the embedded rod extends to the outer side of the bottom of the second pile body. During operation, the conical shape of the bottom of the embedded rod ensures that when the second pile body enters the hole, the conical embedded rod will first embed itself into the bottom of the hole because the bottom of the embedded rod extends to the outer side of the bottom of the second pile body. This improves the stability of the first and second pile bodies within the hole and avoids displacement during subsequent mortar delivery.

[0009] Preferably, the reinforcement mechanism includes multiple mounting slots formed on the outer circumference of the pile body two, with the multiple mounting slots and the embedded rods arranged in a one-to-one correspondence; a reinforcing column one is rotatably connected in each mounting slot; a reinforcing column two is provided at the bottom of the reinforcing column one through a fastening mechanism; the fastening mechanism is used to support the reinforcing column one and the reinforcing column two; the embedded rod is fixed to the two side walls of the reinforcing column two.

[0010] Preferably, the fastening mechanism includes a support plate between reinforcing column one and reinforcing column two; the side wall of the support plate is rotatably connected to reinforcing column one and reinforcing column two via two rotating frames; a mounting frame one is fixedly connected at the contact position between the rotating frame and the support plate; reinforcing column one and reinforcing column two are rotatably connected to the two side walls of the rotating frame via a rotating shaft.

[0011] Preferably, a hinge frame is provided on the inner wall of the mounting groove at the contact position of the reinforcing column one; the reinforcing column one is rotatably connected to the hinge frame through a rotating rod, and a mounting frame two is fixedly connected at the contact position of the reinforcing column one and the hinge frame; during operation, the hinge frame provided at the contact position of the reinforcing column one and the inner wall of the mounting groove allows the reinforcing column two and the reinforcing column one to rotate towards the side closer to the hole when under pressure, thereby facilitating the support of the pile body two.

[0012] Preferably, multiple conical columns are fixed to the end face of the support plate away from the first and second reinforcing columns; the multiple conical columns are irregularly distributed on the end face of the support plate; the pointed end of each conical column faces the hole side, and each conical column is provided with a locking rod on its surface; during operation, when the support plate is moved by the rotation of the first and second reinforcing columns, the conical columns on the end face of the support plate will be tightly pressed into the hole, thereby fastening the first and second reinforcing columns, ensuring the strength of the pile body when in contact with the hole, which is beneficial for the protection of different types of holes such as connected thin-layer deep holes, avoiding the problem of uneven stress that can easily lead to collapse, and ensuring the safe and smooth construction of the pile foundation project.

[0013] Preferably, the depth of each mounting groove is greater than the height of reinforcing column one and reinforcing column two; a gap is left between reinforcing column one and reinforcing column two and the mounting groove.

[0014] Preferably, each of the mounting slots and reinforcing columns one and two are arranged in a one-to-one correspondence; the reinforcing columns one and two are arranged in a circular array on the outer circumferential surface of the pile body two; during operation, the reinforcing columns one and two are arranged in a circular array, and when the reinforcing columns one and two rotate, they will adaptively engage in the hole, and engage in the hole in a circular shape, which facilitates the subsequent entry of mortar between the reinforcing columns one and two, and maintains the reinforcing columns one and two in a deflected state, avoiding the problem of hole collapse in the later stage, and ensuring the safe and smooth construction of the pile foundation project.

[0015] Preferably, the two side walls of the pile body are fixedly connected with clamping discs; the clamping discs have threaded grooves; the shapes of the clamping discs and threaded grooves are adapted to the threaded rods of the external grouting pipe.

[0016] A method for constructing karst cave pile foundations, the method employing any one of the aforementioned karst cave pile foundation construction devices, includes the following steps:

[0017] S1. During construction, it is necessary to drill holes at the location of the karst cave. During the drilling process, attention should be paid to the location and boundary of the karst cave. After the hole is formed, pile body one and pile body two are placed in the hole, so that pile body one, pile body two and reinforcing bars are completely placed in the hole, and the embedded rod is inserted into the bottom of the hole.

[0018] S2. Then, install the grouting pipe at the top of the pile body 1. The grouting pipe is placed inside the cement hopper bag. The pipe enters the cement hopper bag 4 0.3-0.5m below the pipe and is 50cm above the ground. Weld a flange at the pipe position above the ground to prevent the pipe from falling into the hole. Then, pour mortar through the pipe within 1 meter below the hole opening to fill the gap between the pipe and the hole wall and prevent the pipe from shifting during the mortar pumping process.

[0019] S3. Connect the pipe to the ground pump delivery pipe. The mortar injection uses a high-pressure delivery pipe to enter the cement tank bag inside pile body one and pile body two, so that the cement tank bag automatically fills the reinforcing bars and holes. After the cement tank bag is full and the pressure reaches the design pressure, stabilize the pressure for about 30 minutes, pull out the grouting pipe, and after the grouting construction is completed, pull out the sleeve and seal the hole.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The present invention discloses a method and device for constructing karst cave pile foundations. Cement is self-filled into reinforcing bars and holes using cement-filled bags. After the cement-filled bags are full and the pressure reaches the design pressure, the pressure is stabilized for about 30 minutes before the grouting pipe is pulled out. After grouting is completed, the casing is pulled out and the borehole is sealed. This design can adapt to karst caves in different environments, such as interconnected thin-layered deep caves, avoiding the problem of uneven stress leading to collapse. Through the pile body one, pile body two, and cement-filled bags of this embodiment, the strength of the borehole after drilling is improved. Furthermore, the cement in the cement-filled bags self-fills the reinforcing bars and one side of the borehole, ensuring a dense filling of the karst cave cavity. The filling material can solidify with the surrounding environment into a whole and possesses a certain strength, facilitating subsequent pile foundation construction.

[0022] 2. The karst cave pile foundation construction method and construction device of the present invention, wherein reinforcing column one and reinforcing column two are rotatably connected to the side wall of the rotating frame by a rotating shaft, so when reinforcing column two is under pressure, reinforcing column two and reinforcing column one will rotate relative to each other, and reinforcing column two and reinforcing column one will drive the support plate to move closer to the inner wall of the hole, thereby improving the contact strength between the pile body two and the hole, ensuring that the subsequent mortar can be consolidated with the surrounding environment into a whole, and has high strength, long service life, and is not easy to collapse, thus ensuring the safe and smooth construction of the pile foundation project. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a perspective view of pile body one and pile body two of the present invention;

[0025] Figure 2 This is a schematic diagram of the reinforcing rib structure of the present invention;

[0026] Figure 3 This is a top view of the pile body in this invention;

[0027] Figure 4 This is a schematic diagram of the structure of reinforcing column one and reinforcing column two in this invention;

[0028] Figure 5 This is a schematic diagram of the support plate structure in this invention;

[0029] Figure 6 In this invention Figure 5 Enlarged view of the structure at point A;

[0030] Figure 7 In this invention Figure 5 Enlarged view of the structure at point B;

[0031] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0032] Figure 9 This is a flowchart of the method in this invention.

[0033] In the diagram: 1. Pile body one; 2. Pile body two; 3. Reinforcing rib; 4. Cement hopper bag; 5. Embedded rod; 6. Mounting groove; 7. Reinforcing column one; 701. Mounting frame one; 702. Mounting frame two; 8. Reinforcing column two; 9. Support plate; 10. Rotating frame; 101. Rotating shaft; 11. Hinge frame; 12. Conical column; 14. Clip plate; 15. Threaded groove. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] Example 1

[0036] like Figures 1 to 4 As shown in the embodiment of the present invention, a karst cave pile foundation construction device includes a pile body 1 and a pile body 2; a reinforcing rib 3 is welded between the pile body 1 and the pile body 2; multiple reinforcing ribs 3 are arranged in a circular array between the pile body 1 and the pile body 2; the pile body 1, the pile body 2, and the reinforcing ribs 3 are all made of stainless steel; both the pile body 1 and the pile body 2 have a hollow design; a cement hopper bag 4 is provided inside both the pile body 1 and the pile body 2; multiple embedded rods 5 are provided on the outer circumferential surface of the pile body 2; the multiple embedded rods 5 are arranged in a circular array on the outer circumferential surface of the pile body 2; multiple reinforcement mechanisms are provided on the outer circumferential surface of the pile body 2 to reinforce the pile body 1 and the pile body 2;

[0037] The purpose of karst cave treatment is to ensure that the cavities of the karst caves are filled densely, that the filling material is consolidated with the surrounding environment into a whole, and that it has a certain strength. It also aims to sever the connection between the cave and groundwater and karst water, preventing further development, thus ensuring the safe and smooth construction of the pile foundation project. Currently, after drilling a hole in a karst cave, mortar is usually directly pumped into the hole and then flows into the karst cave. However, this method is only suitable for sections with thick and hard karst cave walls. If there are some interconnected thin-layered deep caves, and only mortar is simply pumped in, there is a high possibility that the inner walls of the karst cave may experience uneven stress during the mortar pumping process, leading to collapse and affecting the subsequent construction of the pile foundation project.

[0038] During construction, drilling is required at the location of the karst cave. During drilling, attention must be paid to the location and boundaries of the karst cave. After drilling, pile body 1 and pile body 2 (as described in this embodiment) are placed inside the hole, ensuring that pile body 1, pile body 2, and reinforcing rib 3 are completely contained within the hole. The embedding rod 5 is inserted into the bottom of the hole. Then, a grouting conduit is installed at the top of pile body 1, placed inside a cement hopper bag 4. The conduit extends 0.3-0.5m below the cement hopper bag 4 and is 50cm above the ground. A flange is welded at the conduit's position above the ground to prevent it from falling into the hole. Mortar is then poured through the conduit within 1 meter below the hole opening to fill the gap between the conduit and the hole wall, preventing the conduit from shifting during mortar pumping. The conduit opening is connected to the ground pump delivery pipe. Mortar injection uses a high-pressure delivery pipe to enter pile body 1 and... The cement-filled bag 4 inside pile body 2 adaptively fills the reinforcing rib 3 and the hole. After the cement-filled bag 4 is full and the pressure reaches the design pressure, it is stabilized for about 30 minutes before the grouting pipe is pulled out. After the grouting construction is completed, the casing is pulled out and the hole is sealed. This design can adapt to karst caves in different environments, such as connected thin-layer deep caves, avoiding the problem of uneven stress that easily leads to collapse. Through pile body 1, pile body 2, and cement-filled bag 4 in this embodiment of the invention, the strength of the hole after drilling is improved, and the cement in the cement-filled bag 4 will adaptively fill the reinforcing rib 3 and one side of the hole, the cavity of the karst cave can be filled densely, and the filling material can be consolidated with the surrounding environment into a whole with a certain strength, which facilitates the construction of subsequent pile foundation projects. It should be noted that Figure 1 In this context, D represents a hole drilled inside the cave.

[0039] It should be noted that the drilling depth should be adapted to the height of pile body 1 and pile body 2.

[0040] The bottom of the embedded rod 5 is conical, and the material of the embedded rod 5 is stainless steel. The bottom of the embedded rod 5 extends to the outer side of the bottom of the pile body 2. During operation, the bottom of the embedded rod 5 is conical. When the pile body 2 enters the hole, because the bottom of the embedded rod 5 extends to the outer side of the bottom of the pile body 2, the conical embedded rod 5 will first be embedded below the hole, which improves the stability of the pile body 1 and the pile body 2 in the hole and avoids displacement during the subsequent mortar delivery process.

[0041] like Figures 4 to 7 As shown, the reinforcement mechanism includes multiple mounting slots 6 formed on the outer circumferential surface of the pile body 2, with each mounting slot 6 and embedded rod 5 arranged in a one-to-one correspondence; a reinforcing column 7 is rotatably connected in each mounting slot 6; a reinforcing column 8 is provided at the bottom of the reinforcing column 7 through a fastening mechanism; the fastening mechanism is used to support the reinforcing column 7 and the reinforcing column 8; the embedded rod 5 is fixed to the two side walls of the reinforcing column 8.

[0042] In the initial state, reinforcing column 1 7 and reinforcing column 2 8 are vertical. During operation, when the embedding rod 5 is embedded into the hole, the embedding rod 5 is compressed and presses against reinforcing column 2 8. Since reinforcing column 1 7 is rotatably connected to the inner wall of the mounting groove 6, when reinforcing column 2 8 applies a certain pressure to reinforcing column 1 7, reinforcing column 2 8 and reinforcing column 1 7 will rotate towards the side closer to the inner wall of the hole, and will drive the fastening mechanism to press against the inner wall of the hole, improving the strength of the bottom of pile 2 2, which is beneficial for the subsequent sealing of the karst cave hole.

[0043] The fastening mechanism includes a support plate 9 between reinforcing column 7 and reinforcing column 8; the side wall of the support plate 9 is rotatably connected to reinforcing column 7 and reinforcing column 8 via two rotating frames 10; a mounting bracket 701 is fixedly connected at the contact position between the rotating frame 10 and the support plate 9; reinforcing column 7 and reinforcing column 8 are rotatably connected to the two side walls of the rotating frame 10 via a rotating shaft 101; during operation, since reinforcing column 7 and reinforcing column 8 are rotatably connected to the side wall of the rotating frame 10 via the rotating shaft 101, when reinforcing column 8 is compressed, reinforcing column 8 and reinforcing column 7 will rotate relative to each other, and reinforcing column 8 and reinforcing column 7 will drive the support plate 9 to move closer to the inner wall of the hole (e.g. Figure 5 (As shown) This figure shows that reinforced column 2 8 and reinforced column 1 7 rotate relative to each other; this increases the contact strength between pile 2 2 and the hole, ensuring that the subsequent mortar can be consolidated with the surrounding environment into a whole, with high strength, long service life, and is not easy to collapse, thus ensuring the safe and smooth construction of the pile foundation project.

[0044] A hinge frame 11 is provided on the inner wall of the mounting groove 6 at the contact position of the reinforcing column 7; the reinforcing column 7 is rotatably connected to the hinge frame 11 via a rotating rod, and a mounting frame 702 is fixedly connected at the contact position between the reinforcing column 7 and the hinge frame 11; during operation, the hinge frame 11 is provided at the contact position between the reinforcing column 7 and the inner wall of the mounting groove 6, which allows the reinforcing column 8 and the reinforcing column 7 to rotate towards the side closer to the hole when under pressure, thereby facilitating the support of the pile body 2.

[0045] Multiple conical columns 12 are fixedly connected to the end face of the support plate 9 away from the reinforcing column 7 and the reinforcing column 8. The multiple conical columns 12 are irregularly distributed on the end face of the support plate 9. The pointed end of the conical column 12 faces the hole side, and each conical column 12 is provided with a locking rod on its surface. During operation, when the support plate 9 is moved by the rotation of the reinforcing column 7 and the reinforcing column 8, the conical columns 12 on the end face of the support plate 9 will be tightly pressed into the hole, thereby fastening the reinforcing column 7 and the reinforcing column 8. This ensures the strength of the pile body 2 when in contact with the hole, which is beneficial for the protection of different types of holes, such as connected thin-layer deep holes, and avoids the problem of uneven stress that can easily lead to collapse, thus ensuring the safe and smooth construction of the pile foundation project.

[0046] The depth of each mounting groove 6 is greater than the height of reinforcing column 1 7 and reinforcing column 2 8; a gap is left between reinforcing column 1 7 and reinforcing column 2 8 and the mounting groove 6; during operation, since the depth of the mounting groove 6 is greater than the height of reinforcing column 1 7 and reinforcing column 2 8, when reinforcing column 1 7 and reinforcing column 2 8 are in their initial state, that is, when reinforcing column 1 7 and reinforcing column 2 8 are in a vertical state, reinforcing column 1 7 and reinforcing column 2 8 will be completely inside the mounting groove 6. This design facilitates the transportation of pile body 1 and pile body 2, and avoids reinforcing column 1 7 and reinforcing column 2 8 being outside the mounting groove 6, which would occupy too much space and affect the transportation of pile body 2 and pile body 1. At the same time, the gap between reinforcing column 1 7 and reinforcing column 2 8 and the mounting groove 6 facilitates the rotation of reinforcing column 1 7 and reinforcing column 2 8 when under pressure, which is beneficial for the support plate 9 to be inserted into the inner wall of the hole.

[0047] Each of the aforementioned mounting slots 6, reinforcing column 1 7, and reinforcing column 2 8 is arranged in a one-to-one correspondence; the reinforcing columns 1 7 and 2 8 are arranged in a circular array on the outer circumferential surface of the pile body 2; during operation, the reinforcing columns 1 7 and 2 8 are arranged in a circular array, and when the reinforcing columns 1 7 and 2 8 rotate, they will adaptively engage in the hole, and engage in a circular manner, which facilitates the subsequent entry of mortar between the reinforcing columns 1 7 and 2 8, and maintains the reinforcing columns 1 7 and 2 8 in a deflected state, avoiding the problem of hole collapse in the later stage, and ensuring the safe and smooth construction of the pile foundation project.

[0048] Example 2

[0049] like Figure 8 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the two side walls of the pile body 1 are fixedly connected with a snap-fit ​​plate 14; the snap-fit ​​plate 14 is provided with a threaded groove 15; the shape of the snap-fit ​​plate 14 and the threaded groove 15 is adapted to the threaded rod of the external grouting pipe; during operation, the snap-fit ​​plate 14 and the threaded groove 15 are provided on the outer side wall of the pile body 1, which can facilitate the connection between the grouting pipe and the cement tank bag 4 inside the pile body 1, and facilitate the external mortar to be transported from the grouting pipe to the cement tank bag 4.

[0050] like Figure 9 As shown, a method for constructing karst cave pile foundations, which employs any one of the aforementioned karst cave pile foundation construction devices, includes the following steps:

[0051] S1. During construction, it is necessary to drill holes at the location of the karst cave. During the drilling process, attention should be paid to the location and boundary of the karst cave. After the hole is formed, pile body 1 and pile body 2 are placed in the hole, so that pile body 1, pile body 2 and reinforcing bar 3 are completely placed in the hole, and the embedded rod 5 is inserted into the bottom of the hole.

[0052] S2. Then, install the grouting pipe at the top of the pile body 1. The grouting pipe is placed inside the cement hopper bag 4. The pipe enters 0.3-0.5m below the cement hopper bag 4 and is 50cm above the ground. Weld a flange at the position of the pipe above the ground to prevent the pipe from falling into the hole. Then, pour mortar through the pipe within 1 meter below the hole opening to fill the gap between the pipe and the hole wall and prevent the pipe from shifting during the pumping of mortar.

[0053] S3. Connect the pipe to the ground pump delivery pipe. The mortar injection uses a high-pressure delivery pipe to enter the cement tank bag 4 inside pile body 1 and pile body 2, so that the cement tank bag 4 can automatically fill the reinforcing bar 3 and the hole. After the cement tank bag 4 is full and the pressure reaches the design pressure, stabilize the pressure for about 30 minutes, pull out the grouting pipe, and after the grouting construction is completed, pull out the sleeve and seal the hole.

[0054] This design can adapt to karst caves in different environments, such as interconnected thin-layered deep caves, avoiding the problem of uneven stress that can easily lead to collapse. Through the pile body 1, pile body 2, and cement jar bag 4 in this embodiment of the invention, the strength of the hole after drilling is improved, and the cement in the cement jar bag 4 will adaptively fill the reinforcing bar 3 and one side of the hole, so that the cavity of the karst cave can be filled densely, and the filling material can be consolidated with the surrounding environment into a whole, and has a certain strength, which facilitates the construction of subsequent pile foundation projects.

[0055] During the work, it is necessary to drill holes at the location of the karst cave. During drilling, attention must be paid to the location and boundaries of the karst cave. After drilling, pile body 1 and pile body 2 (as described in this embodiment) are placed inside the hole, ensuring that pile body 1, pile body 2, and reinforcing rib 3 are completely contained within the hole. The embedding rod 5 is then inserted into the bottom of the hole. Subsequently, a grouting guide pipe is installed at the top of pile body 1, placed inside a cement hopper bag 4. The guide pipe extends 0.3-0.5m below the cement hopper bag 4 and is 50cm above the ground. A flange is welded at the point above the ground to prevent the guide pipe from falling into the hole. Then, mortar is poured through the guide pipe within 1 meter below the hole opening to fill the gap between the guide pipe and the hole wall, preventing the guide pipe from shifting during mortar pumping. The pipe opening is then connected to the ground pump delivery pipe. The mortar injection uses a high-pressure delivery pipe. The cement jars 4 inside pile body 1 and pile body 2 are filled with cement, which automatically fills the reinforcing bars 3 and the holes. After the cement jars 4 are filled and the pressure reaches the design pressure, the pressure is stabilized for about 30 minutes. Then the grouting pipe is pulled out. After the grouting construction is completed, the casing is pulled out and the hole is sealed. This design can adapt to karst caves in different environments, such as connected thin-layer deep caves, and avoid the problem of uneven stress that can easily lead to collapse. Through the pile body 1, pile body 2, and cement jars 4 of this invention, the strength of the hole after drilling is improved. The cement in the cement jars 4 will automatically fill the reinforcing bars 3 and one side of the hole. The cavity of the karst cave can be filled densely. The filling material can be consolidated with the surrounding environment into a whole and has a certain strength, which facilitates the construction of subsequent pile foundation projects.

[0056] When the embedding rod 5 is embedded into the hole, it is compressed and presses against the reinforcing column 2 8. Since the reinforcing column 1 7 is rotatably connected to the inner wall of the mounting groove 6, when the reinforcing column 2 8 applies a certain pressure to the reinforcing column 1 7, the reinforcing column 2 8 and the reinforcing column 1 7 will rotate towards the inner wall of the hole, and will drive the fastening mechanism to press against the inner wall of the hole, improving the strength of the bottom of the pile body 2 2, which is beneficial for the subsequent sealing of the karst cave. Since the reinforcing column 1 7 and the reinforcing column 2 8 are rotatably connected to the side wall of the rotating frame 10 through the rotating shaft 101, when the reinforcing column 2 8 is compressed, the reinforcing column 2 8 and the reinforcing column 1 7 will... The pile body 2 rotates relative to the hole, and the reinforcing columns 2 and 7 will drive the support plate 9 to move closer to the inner wall of the hole; this improves the contact strength between the pile body 2 and the hole, ensuring that the subsequent mortar can be consolidated with the surrounding environment into a whole, with high strength, long service life, and is not easy to collapse, thus ensuring the safe and smooth construction of the pile foundation project; when the support plate 9 is moved by the rotation of the reinforcing columns 1 and 2, the conical column 12 on the end face of the support plate 9 will be pressed tightly into the hole, thereby securing the reinforcing columns 1 and 2, ensuring the strength of the pile body 2 when in contact with the hole;

[0057] Since the depth of the mounting groove 6 is greater than the height of the first reinforcing column 7 and the second reinforcing column 8, when the first reinforcing column 7 and the second reinforcing column 8 are in their initial state, that is, when the first reinforcing column 7 and the second reinforcing column 8 are in a vertical state, the first reinforcing column 7 and the second reinforcing column 8 will be completely inside the mounting groove 6. This design facilitates the transportation of the first pile body 1 and the second pile body 2, and avoids the problem that the first reinforcing column 7 and the second reinforcing column 2 are located outside the mounting groove 6, which would occupy too much space and affect the transportation of the second pile body 2 and the first pile body 1. At the same time, a gap is designed between the first reinforcing column 7 and the second reinforcing column 2 and the mounting groove 6, which can facilitate the rotation of the first reinforcing column 7 and the second reinforcing column 2 when under pressure, and is conducive to the support plate 9 being inserted into the inner wall of the hole.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A solution cavity pile foundation construction apparatus, characterised in that: The utility model provides a pile body one (1) and pile body two (2), welding has the reinforcing rib (3) between pile body one (1) and pile body two (2), the reinforcing rib (3) sets up multiple, and the circumferential array is set between pile body one (1) and pile body two (2), the material quality of pile body one (1), pile body two (2) and reinforcing rib (3) is stainless steel, the inside of pile body one (1) and pile body two (2) is hollow type design, the inside of pile body one (1) and pile body two (2) is provided with cement tank bag (4), the outer circumferential surface of pile body two (2) is provided with multiple embedding rods (5), multiple embedding rods (5) are circumferentially arrayed and set in the outer circumferential surface of pile body two (2), the outer circumferential surface of pile body two (2) is provided with multiple reinforcing mechanisms, and the reinforcing mechanism is used to reinforce pile body one (1) and pile body two (2). The reinforcing mechanism includes multiple installation grooves (6) opened in the outer circumferential surface of pile body two (2), multiple installation grooves (6) and embedding rods (5) are one-to-one corresponding, each installation groove (6) is rotatably connected with a reinforcing column one (7), the bottom of the reinforcing column one (7) is provided with a reinforcing column two (8) through a fastening mechanism, the fastening mechanism is used to support the reinforcing column one (7) and the reinforcing column two (8), and the embedding rod (5) is fixedly connected to the two side walls of the reinforcing column two (8). The fastening mechanism includes a support plate (9) between the reinforcing column one (7) and the reinforcing column two (8), the side wall of the support plate (9) is rotatably connected with the reinforcing column one (7) and the reinforcing column two (8) through two rotating frames (10), the rotating frame (10) is fixedly connected with a mounting frame one (701) at the contact position with the support plate (9), and the reinforcing column one (7) and the reinforcing column two (8) are rotatably connected with the two side walls of the rotating frame (10) through a rotating shaft (101). The inner wall of the installation groove (6) is provided with a hinged frame (11) at the contact position with the reinforcing column one (7), the reinforcing column one (7) is rotatably connected in the hinged frame (11) through a rotating rod, and the reinforcing column one (7) is fixedly connected with a mounting frame two (702) at the contact position with the hinged frame (11). The end face of the support plate (9) away from the reinforcing column one (7) and the reinforcing column two (8) is fixedly connected with multiple tapered columns (12), multiple tapered columns (12) are irregularly distributed on the end face of the support plate (9), the pointed part of the tapered column (12) faces the hole side, and the surface of each tapered column (12) is provided with a clamping rod.

2. A solution cavity pile foundation construction apparatus according to claim 1, characterised in that: The bottom of the embedding rod (5) is tapered, the material of the embedding rod (5) is stainless steel, and the bottom of the embedding rod (5) extends to the outside of the bottom of the pile body two (2).

3. The solution cavity pile foundation construction device according to claim 1, characterized in that: The depth of each installation groove (6) is greater than the height of the reinforcing column one (7) and the reinforcing column two (8), and a gap is left between the reinforcing column one (7), the reinforcing column two (8) and the installation groove (6).

4. A solution cavity pile foundation construction apparatus according to claim 3, wherein: Each installation groove (6) is one-to-one corresponding with the reinforcing column one (7) and the reinforcing column two (8), and the reinforcing column one (7) and the reinforcing column two (8) are circumferentially arrayed on the outer circumferential surface of the pile body two (2).

5. A solution cavity pile construction apparatus as claimed in claim 4, wherein: The both side walls of the pile body one (1) are fixedly connected with clamping discs (14); the clamping discs (14) are provided with screw grooves (15) inside; the clamping discs (14) and the screw grooves (15) are adapted to the shape of the threaded rods of the grouting guide pipes.

6. A method for construction of a karst pile foundation, characterized in that the method uses the karst pile foundation construction device according to any one of claims 1-5. The method comprises the following steps: S1, during construction, drilling is needed at the position of the karst cave, and the position and boundary of the karst cave need to be paid attention to during drilling; after the drilling is completed, the pile body one (1) and the pile body two (2) are placed in the hole, so that the pile body one (1) and the pile body two (2) and the reinforcing rib (3) are completely placed in the hole, and the embedded rod (5) is clamped into the bottom of the hole, S2, then a grouting guide pipe is installed at the top of the pile body one (1), and the grouting guide pipe is placed in the cement bag (4); the guide pipe enters the cement bag (4) by 0.3-0.5m, and is 50cm higher than the ground; a flange is welded at the position of the guide pipe which is higher than the ground, so as to prevent the guide pipe from falling into the hole; then mortar is poured through the guide pipe within 1m below the hole, so as to fill the gap between the guide pipe and the hole wall, and prevent the guide pipe from moving during pumping of the mortar, S3, and the pipe opening is connected with the ground pump delivery pipe; the mortar injection adopts high-pressure delivery pipe to enter the cement bag (4) in the pile body one (1) and the pile body two (2), so that the cement bag (4) is self-adaptively filled into the reinforcing rib (3) and the hole; after the cement bag (4) is filled, the pressure reaches the design pressure, and the pressure is stabilized for about thirty minutes; the grouting guide pipe is pulled out; after the grouting construction is completed, the sleeve pipe is pulled out and the hole is plugged.

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