A micro steel pipe pile bottom plate grouting and plugging structure

Abstract

The present invention relates to the technical field of steel pipe pile construction, and discloses a micro steel pipe pile bottom plate grouting and plugging structure, comprising a steel pipe placed vertically on the ground, a connector movably connected to the bottom of the steel pipe, a plurality of casting pipes fixedly connected to the top of the connector, a top cover installed on the common top of the plurality of casting pipes, a support plate movably connected to the bottom of the connector, a movable ring slidably connected to the inside of the connector, an inner ring of the movable ring extends toward the inside of the steel pipe to form a plurality of bayonet structures, a moving block is fixedly installed at the bottom of each bayonet structure, a first partition plate is fixedly installed on one side of the moving block, the inner side of the first partition plate is slidably connected to the outside of the steel pipe through the bayonet structure, in this micro steel pipe pile bottom plate grouting and plugging structure, the bayonet position of the moving block and the steel pipe is disengaged, and the first partition plate and the inner wall of the connector are abutted against each other to prevent mud from entering the inside of the steel pipe from the side of the bottom of the steel pipe, causing mud to overflow everywhere, thereby increasing the pressure at each through hole and improving the filling efficiency of the bottom of the waterproof layer.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe pile construction, in particular to a micro steel pipe pile bottom plate grouting and plugging structure. Background Art

[0002] Steel pipe piles are divided into three parts: the upper part, the middle part, and the lower part. The upper part of the steel pipe pile is one of the components of the steel pipe pile. The upper part has high structural rigidity and can withstand the pressure of heavy objects. The upper part mainly consists of the construction interface, the pipe top plate, the pile cap, and the anchor. The construction interface protects the water-logged part of the steel pipe pile and prevents the ingress of mud. In addition, during the construction of the foundation pier, it is necessary to install an upper support frame to ensure the stability of the horizontality within the pile.

[0003] Middle section: The middle section of a steel pipe pile is one of the components of the steel pipe pile. Therefore, this part requires regular inspection and maintenance. The middle section mainly consists of the pile body, construction interface and spacer.

[0004] The lower section of a steel pipe pile is one of the components of the pile, primarily bearing the horizontal loads of the piers and the vertical loads of the abutments. The lower section primarily consists of the steel pipe piles, pile foundation, and base plate. The base plate serves as the foundation for securing the piers and requires proper selection to ensure that its strength meets design requirements.

[0005] During the construction of steel pipe piles, it is necessary to fill the inside of them with concrete according to the construction project to improve the compressive strength of the pile body. A steel cage will be placed in the steel pipe and concrete will be poured to form a composite structure. For example, in bridge projects and soft soil foundation surfaces, it is necessary to fill the inside of the steel pipe with concrete. During construction, a drilling machine is required to drill holes in the ground, and then the steel pipe piles are placed into the ground hole by a crane. Then, the steel pipe piles are filled with concrete one or two days before the installation of the reinforced structure. C50 concrete is commonly used. After the filling is completed, steel bars are installed between the steel pipe piles for traction and fixation. The concrete construction process adopts the high-throw method, which uses the deadweight of concrete to fill the pipe. The other is the conduit method, which extends a section of conduit into the bottom of the steel pipe to pour the inside of the steel pipe. During the pouring process, there is a certain gap between the surface of the steel pipe pile and the ground hole. Although the steel pipe pile can be erected on the ground after the bottom plate of the steel pipe pile contacts the bottom of the underground cave, the load on the bottom of the steel pipe pile during concrete construction is much greater than the load on its upper layer. This may cause the concrete to be not dense due to vibration, and it needs to be poured in two stages, which will cause the concrete to shrink prematurely. As a result, cracks often appear in the concrete, which in turn causes the waterproof layer to be pulled apart, forming leakage points. The existing plugging method is groove sealing plugging: a circular groove with a depth of 10-15cm and a diameter of 3-5cm is chiseled at the leakage point of the bottom plate, and sealed with a quick-setting inorganic plugging material. After no leakage is found, the next process is carried out. After the pouring is completed, it is necessary to drill a hole from top to bottom inside the steel pipe pile to the bottom plate. This operation is relatively difficult and may damage other layers of the steel pipe pile. It requires a large amount of concrete backfill, resulting in a relatively long processing time. To this end, we propose a micro steel pipe pile bottom plate grouting plugging structure. Summary of the Invention

[0006] The purpose of the present invention is to provide a micro steel pipe pile bottom plate grouting and plugging structure to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a micro steel pipe pile bottom plate grouting and plugging structure, comprising a steel pipe placed vertically on the ground, a connector movably connected to the bottom of the steel pipe, a plurality of casting pipes fixedly connected to the top of the connector, a top cover installed on the common top of the plurality of casting pipes, a support plate movably connected to the bottom of the connector, a movable ring slidably connected inside the connector, the inner ring of the movable ring extends toward the inside of the steel pipe to form a plurality of bayonet structures, a moving block is fixedly installed at the bottom of each bayonet structure, a first partition plate is fixedly installed on one side of the moving block, the inner side of the first partition plate is slidably connected to the outside of the steel pipe through the bayonet structure, a plurality of docking cuts are provided on the outer ring of the movable ring, a plurality of through holes are provided on the top of the support plate, and the support plate is communicated with the bottom of the casting pipe through the docking cuts.

[0008] Preferably, the support plate is cross-shaped, and the connector includes a base plate fixed to the bottom of multiple casting pipes. The inside of the base plate extends outward to form an overflow area for storing slurry. A plurality of limit grooves are provided at the bottom of the base plate. The plurality of limit grooves and the support plate are clamped together. A plurality of slurry discharge grooves are provided on the inside of the overflow area. The docking cuts and the overflow area correspond one to one. A slurry discharge groove extension top is provided at the bottom of the base plate near each docking cut.

[0009] Preferably, each slurry discharge trough has a downward extending guide slope at the bottom, and the inner side and outer edge of the movable ring are respectively against the steel pipe and the slurry overflow area and are slidably connected.

[0010] Preferably, a first magnet is fixedly connected to the top of each docking cutout, and a second magnet is fixedly mounted on the inner wall of the bottom plate near the top of each first magnet.

[0011] Preferably, a countersunk head is fixedly connected to the middle of the support plate, and a plurality of grouting pipes are fixedly installed on the countersunk head toward the inner side of the steel pipe. A plurality of connecting holes are opened at equal intervals on each grouting pipe, and a sealing plate is fixedly installed at one end of each grouting pipe, and the sealing plate and the inner wall of the steel pipe are abutted against each other.

[0012] Preferably, a plurality of teeth are fixedly installed at equal intervals on one side of each moving block, a rotating tube is rotatably connected inside the grouting tube, a gear is fixedly connected to one end of the rotating tube, the gear and the teeth are meshed together, and a yield rod for sealing the connecting hole is fixedly installed on the surface of the rotating tube.

[0013] Preferably, a plurality of third magnets are fixedly mounted on the inner ring of the grouting pipe and the outer ring of the rotating pipe, and the third magnets located on the inner ring of the grouting pipe and the third magnets located on the outer ring of the rotating pipe have opposite magnetic poles and attract each other.

[0014] Preferably, an overflow head is fixedly installed at the other end of the grouting pipe, each overflow head is located inside the countersunk head, an extension rod is fixedly installed at the other end of the rotating tube, a sealing piece is fixedly connected to the inner ring of the overflow head, the extension rod and the sealing piece are slidably connected together, one end of the extension rod is fixedly connected to a second partition plate, and a slurry leakage hole is opened on the top of the overflow head.

[0015] Preferably, a plurality of leakage holes are opened at the bottom of the outer ring of the steel pipe, a central ring is slidably connected to the middle of the outer part of the steel pipe, each casting pipe is fixedly connected to the central ring, and a plurality of anchor thorns are fixedly installed on the outer surface of the steel pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The bottom of the casting pipe of the present invention is connected to the connector, so that after the movable ring contacts the mud, it is dispersed to the bottom of the connector through the docking incision. The mud inside the casting pipe has gravity and the downward pressure provided by the pump to cause the movable ring to descend. When the movable ring descends, the mud at the bottom of the movable ring is introduced into each through hole along the inside of the support plate, wherein the support plate is located at the bottom of the steel pipe, and the cracks of the mud at the bottom of the steel pipe can be randomly filled to prevent water seepage at the bottom of the steel pipe, thereby preliminarily solving the defects of the waterproof layer inside the steel pipe and improving the service life of the steel pipe.

[0018] The movable block and the bayonet position of the steel pipe are disengaged, and the first partition plate and the inner wall of the connector are abutted against each other to prevent mud from entering the inside of the steel pipe from the bottom side of the steel pipe, causing mud to overflow everywhere, thereby increasing the pressure at each through hole and improving the filling efficiency of the bottom of the waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cooperation between multiple integral bodies and the ground of the present invention;

[0020] Figure 2 A schematic diagram of the cooperation between a single unit and the ground of the present invention;

[0021] Figure 3 Schematic diagram of the internal structure of the steel pipe of the present invention;

[0022] Figure 4 This is a schematic diagram of the bottom plate structure of the present invention;

[0023] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 6 This is a schematic diagram of the matching structure of the movable ring and the base plate of the present invention;

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the movable ring of the present invention;

[0026] Figure 8 This is a schematic diagram of the support plate, countersunk head and grouting pipe structure of the present invention;

[0027] Figure 9 For the present invention Figure 8 A schematic cross-sectional view of a part of the structure;

[0028] Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure at B in the middle;

[0029] Figure 11 For the present invention Figure 3 Schematic diagram of the enlarged structure at point C in the middle.

[0030] In the figure: 1-steel pipe; 2-top cover; 3-casting pipe; 4-leakage hole; 5-center ring; 6-anchor thorn; 7-connector; 8-bottom plate; 801-limiting groove; 802-overflow area; 803-grouting trough; 804-guide slope; 9-support plate; 901-through hole; 10-movable ring; 1001-docking cut; 11-countersunk head; 12-sealing plate; 13-first magnet; 14-second magnet; 15-grouting pipe; 16-grouting trough extension top; 17-first partition plate; 18-moving block; 19-gear; 20-third magnet; 21-rotating pipe; 22-yield rod; 23-extension rod; 24-overflow head; 25-sealing piece; 26-second partition plate. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-11The present invention provides a technical solution: a micro steel pipe pile bottom plate grouting plugging structure, comprising a steel pipe 1 placed vertically on the ground, a connector 7 movably connected to the bottom of the steel pipe 1, a plurality of pouring pipes 3 fixedly connected to the top of the connector 7, a top cover 2 installed on the common top of the plurality of pouring pipes 3, a support plate 9 movably connected to the bottom of the connector 7, a movable ring 10 slidably connected inside the connector 7, the inner ring of the movable ring 10 extends into the interior of the steel pipe 1 to form a plurality of bayonet structures, a moving block 18 is fixedly installed at the bottom of each bayonet structure, and a first partition plate 17 is fixedly installed on one side of the moving block 18, The inner side of the first partition plate 17 is slidably connected to the outside of the steel pipe 1 through a bayonet structure, and a plurality of docking cutouts 1001 are provided on the outer ring of the movable ring 10. A plurality of through holes 901 are provided on the top of the support plate 9, and the support plate 9 is connected to the bottom of the pouring pipe 3 through the docking cutouts 1001. First, a hole is drilled in the ground, and then the support plate 9 is placed inside the hole to stabilize the placement of the steel pipe 1. Then, the steel pipe 1 is installed at the drilled hole in the ground. During the production process of the connector 7, it is directly matched with the steel pipe 1 to form a pre-assembled state. When the steel pipe 1 is hoisted by a crane and placed in the ground, the connector When the connector 7 contacts the ground, the steel pipe 1 will slide along the inside of the connector 7, and finally the bottom of the steel pipe 1 will contact the support plate 9. The next step is to grout the bottom of the steel pipe 1 to form a waterproof layer at the bottom of the hole and the bottom of the steel pipe 1. A water layer is formed inside the steel pipe 1 above the waterproof layer. After waiting for 24 hours, the mud will automatically dry up, and then the detector will be used to extend into the bottom of the hole to detect the water content. If the waterproof layer seeps water, the mud can be pumped into the bottom of the pouring pipe 3 with a pump at the top of each pouring pipe 3. In this process, the bottom of the pouring pipe 3 and the connector 7 is connected, so that after the movable ring 10 contacts the mud, it is dispersed to the bottom of the connector 7 through the docking incision 1001. The mud inside the casting pipe 3 has gravity and the downward pressure provided by the pump to make the movable ring 10 fall. When the movable ring 10 falls, the mud at the bottom of the movable ring 10 will be introduced into each through hole 901 along the inside of the support plate 9, wherein the support plate 9 is located at the bottom of the steel pipe 1, and then the cracks of the mud at the bottom of the steel pipe 1 can be randomly filled to prevent water seepage from the bottom of the steel pipe 1, preliminarily solving the defects of the waterproof layer inside the steel pipe 1 and improving the service life of the steel pipe 1.

[0033] The movable block 18 and the bayonet position of the steel pipe 1 are disengaged, and the first partition plate 17 and the inner wall of the connector 7 are abutted against each other to prevent mud from entering the interior of the steel pipe 1 from the bottom side of the steel pipe 1, causing mud to overflow everywhere, thereby increasing the pressure at each through hole 901 and improving the filling efficiency of the bottom of the waterproof layer.

[0034] Specifically, the support plate 9 is in a cross shape, and the connector 7 includes a bottom plate 8 fixed to the bottom of multiple pouring pipes 3. The inside of the bottom plate 8 extends outward to form an overflow area 802 for storing slurry. A plurality of limiting grooves 801 are provided at the bottom of the bottom plate 8. The plurality of limiting grooves 801 and the support plate 9 are snapped together. A plurality of slurry discharge grooves 803 are provided inside the overflow area 802. The docking notches 1001 correspond to the overflow area 802 one by one. The bottom of the bottom plate 8 is located near each docking notch 1001. 01 is provided with a slurry discharge groove extension top 16; the bottom of each slurry discharge groove 803 has a downward extending guide slope 804, and the guide slope 804 prevents mud from remaining inside the slurry discharge groove 803. The inner side and outer edge of the movable ring 10 are respectively against the steel pipe 1 and the overflow area 802 and are slidably connected; the top of each docking cutout 1001 is fixedly connected to a first magnet 13, and the inner wall of the bottom plate 8 is fixedly installed with a second magnet 14 near the top of each first magnet 13. When mud is poured from the inside of the pouring pipe 3, the mud at the bottom of the pouring pipe 3 will accumulate on the top of the movable ring 10. The docking cutout 1001 located on the outer edge of the movable ring 10 and the slurry groove extension top 16 will disperse the mud and make it flow into the overflow area 802 along the slurry groove 803, and then be located at the bottom of the movable ring 10. When the pump power becomes larger, making the internal pressure of the pouring pipe 3 higher, the mud pressure at the upper part of the movable ring 10 is higher, causing the first magnet 13 and the second magnet 14 to separate, thereby allowing the movable ring 10 and the second magnet 14 to disengage. During the descending process of the movable ring 10, it moves like a piston between the bottom plate 8 and the steel pipe 1, and the mud at the bottom of the movable ring 10 is pressurized, allowing the mud to enter the inside of the support plate 9 along one end of the support plate 9 and flow out to the crack along the through hole 901.

[0035] Furthermore, a countersunk head 11 is fixedly connected to the middle of the support plate 9, and a plurality of grouting pipes 15 are fixedly installed on the countersunk head 11 toward the inner side of the steel pipe 1. A plurality of connecting holes are opened at equal intervals on each grouting pipe 15, and a sealing plate 12 is fixedly installed at one end of each grouting pipe 15. The sealing plate 12 is against the inner wall of the steel pipe 1. The sealing plate 12 can effectively prevent the mud from overflowing out of the outside of the steel pipe 1 when the waterproof layer is initially poured on the steel pipe 1. The countersunk head 11 is installed in a pre-buried manner. After a hole is first opened in the ground, the countersunk head 11 is placed into the hole by a crane, wherein each end of the support plate 9 is against the inner wall of the hole. After the position is determined, during the process of placing the steel pipe 1, the bottom of the inner wall of the steel pipe 1 and the sealing plate 12 slide, and then the bottom plate 8 is placed in the right position. In the process of the steel pipe 1 contacting the soil layer at the bottom of the cave, the steel pipe 1 and the movable block 18 are separated at the bayonet position. When the movable ring 10 is pressurized and moves downward, the mud is concentrated in the middle of the support plate 9 and gathered inside the countersunk head 11, so that the mud is output along one end of the grouting pipe 15 to the other end of the grouting pipe 15. Since the grouting pipe 15 has connecting holes, the mud can overflow into the waterproof layer along these connections. If the waterproof layer is not in a leaking state at some point, the grouting pipe 15 cannot be discharged. If the waterproof layer is in a leaking state, the mud inside the grouting pipe 15 will fill the gap along the connecting holes. Multiple connecting holes are conducive to the mud finding multiple gaps and reducing errors. When the waterproof layer is repaired, the strength of the steel pipe 1 is improved.

[0036] Furthermore, a plurality of teeth are fixedly installed at equal distances on one side of each moving block 18, and the grouting pipe 15 is rotatably connected to a rotating pipe 21 inside, and one end of the rotating pipe 21 is fixedly connected to a gear 19, and the gear 19 and the teeth are meshed together, and a yield rod 22 for sealing the connecting hole is fixedly installed on the surface of the rotating pipe 21; a plurality of third magnets 20 are fixedly installed on the inner ring of the grouting pipe 15 and the outer ring of the rotating pipe 21, and the third magnet 20 located on the inner ring of the grouting pipe 15 and the third magnet 20 on the outer ring of the rotating pipe 21 have opposite magnetic poles and attract each other; an overflow head 24 is fixedly installed on the other end of the grouting pipe 15, and each overflow head 24 is located inside the countersunk head 11, and an extension rod 23 is fixedly installed on the other end of the rotating pipe 21, and the inner ring of the overflow head 24 is fixedly connected to a sealing piece 25, and the extension rod 23 and the sealing piece 25 are slidably connected together, and one end of the extension rod 23 is fixedly connected to a second partition plate 26, and the top of the overflow head 24 is provided with a leakage hole. The machine pressure increases, causing the movable ring 10 to descend, which will cause the bayonet structure of the movable ring 10 to descend. Once the bayonet structure is disengaged from the initial position, the moving block 18 will descend. During the descent process, the moving block 18 causes the gear 19 buried in one side of the sealing plate 12 to roll, causing a pair of third magnets 20 to separate. During the rolling process, the gear 19 causes the rotating tube 21 to rotate, thereby causing the yield rod 22 to rotate, which will cause the yield rod 22 to separate from the connecting hole, and the mud inside the grouting pipe 15 to be sprayed out. At the same time, the extension rod 23 at the other end of the rotating tube 21 drives the second partition plate 26 to rotate synchronously, opening the overflow head 24 to facilitate the mud to enter the grouting pipe 15. The initial position of the yield rod 22 is against the connecting hole, preventing the mud from flowing back into the grouting pipe 15 when the waterproof layer is poured on the steel pipe 1, thereby causing the mud inside the grouting pipe 15 to dry and form a blockage.

[0037] In addition, when the movable ring 10 descends, the bayonet structure and the bayonet of the steel pipe 1 are separated, so that the outer wall of the steel pipe 1 can enter the mud for surface repair of the waterproof layer.

[0038] A plurality of leakage holes 4 are provided at the bottom of the outer ring of the steel pipe 1, and a central ring 5 is slidably connected to the middle of the outer part of the steel pipe 1. Each casting pipe 3 is fixedly connected to the central ring 5. A plurality of anchor thorns 6 are fixedly installed on the outer surface of the steel pipe 1. The central ring 5 prevents the casting pipe 3 from shaking. The leakage holes 4 are conducive to the rapid pouring of mud. The anchor thorns 6 can enhance the grabbing force of the steel pipe 1 after the mud grouting is dry.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A micro steel pipe pile bottom plate grouting and plugging structure, comprising a steel pipe (1) placed vertically on the ground, characterized in that: The bottom of the steel pipe (1) is movably connected to a connector (7), the top of the connector (7) is fixedly connected to a plurality of casting pipes (3), a top cover (2) is installed on the common top of the plurality of casting pipes (3), the bottom of the connector (7) is movably connected to a support plate (9), the inside of the connector (7) is slidably connected to a movable ring (10), the inner ring of the movable ring (10) extends into the interior of the steel pipe (1) to form a plurality of bayonet structures, a moving block (18) is fixedly installed at the bottom of each bayonet structure, a first partition plate (17) is fixedly installed on one side of the moving block (18), the inner side of the first partition plate (17) is slidably connected to the outside of the steel pipe (1) through the bayonet structure, the outer ring of the movable ring (10) is provided with a plurality of docking cuts (1001), the top of the support plate (9) is provided with a plurality of through holes (901), and the support plate (9) is communicated with the bottom of the casting pipe (3) through the docking cuts (1001); The support plate (9) is cross-shaped, and the connector (7) includes a bottom plate (8) fixed to the bottom of multiple casting pipes (3). The inside of the bottom plate (8) extends outward to form an overflow area (802) for storing slurry. The bottom of the bottom plate (8) is provided with multiple limiting grooves (801). The multiple limiting grooves (801) and the support plate (9) are engaged together. The inside of the overflow area (802) is provided with multiple slurry grooves (803). The docking cutouts (1001) and the overflow area (802) correspond one to one. The bottom of the bottom plate (8) is provided with a slurry groove extension top (16) near each docking cutout (1001). A first magnet (13) is fixedly connected to the top of each docking notch (1001), and a second magnet (14) is fixedly mounted on the inner wall of the bottom plate (8) near the top of each first magnet (13); A countersunk head (11) is fixedly connected to the middle of the support plate (9), and a plurality of grouting pipes (15) are fixedly installed on the countersunk head (11) toward the inner side of the steel pipe (1). A plurality of connection holes are opened at equal intervals on each of the grouting pipes (15), and a sealing plate (12) is fixedly installed at one end of each of the grouting pipes (15), and the sealing plate (12) and the inner wall of the steel pipe (1) are in contact with each other; A plurality of teeth are fixedly installed at equal intervals on one side of each moving block (18); a rotating tube (21) is rotatably connected inside the grouting tube (15); a gear (19) is fixedly connected to one end of the rotating tube (21); the gear (19) and the teeth are meshed together; a yield rod (22) for blocking the connection hole is fixedly installed on the surface of the rotating tube (21); An overflow head (24) is fixedly installed at the other end of the grouting pipe (15), and each overflow head (24) is located inside the countersunk head (11). An extension rod (23) is fixedly installed at the other end of the rotating pipe (21). A sealing plate (25) is fixedly connected to the inner ring of the overflow head (24). The extension rod (23) and the sealing plate (25) are slidably connected together. One end of the extension rod (23) is fixedly connected to a second partition plate (26). A grouting hole is opened on the top of each overflow head (24).

2. The micro steel pipe pile bottom plate grouting and plugging structure according to claim 1, characterized in that: The bottom of each slurry discharge groove (803) has a downwardly extending guide slope (804), and the inner side and outer edge of the movable ring (10) are respectively against the steel pipe (1) and the slurry overflow area (802) and are slidably connected.

3. The micro steel pipe pile bottom plate grouting and plugging structure according to claim 1, characterized in that: The inner ring of the grouting pipe (15) and the outer ring of the rotating pipe (21) are both fixedly mounted with a plurality of third magnets (20), and the third magnets (20) located in the inner ring of the grouting pipe (15) and the third magnets (20) located in the outer ring of the rotating pipe (21) have opposite magnetic poles and are attracted to each other.

4. The micro steel pipe pile bottom plate grouting and plugging structure according to claim 1, characterized in that: The bottom of the outer ring of the steel pipe (1) is provided with a plurality of leakage holes (4), the middle portion of the outer portion of the steel pipe (1) is slidably connected to a center ring (5), each of the casting pipes (3) is fixedly connected to the center ring (5), and the outer surface of the steel pipe (1) is fixedly provided with a plurality of anchor thorns (6).

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