A composite foundation construction device and its construction method

Abstract

The present invention provides a composite foundation construction device and a construction method thereof. The composite foundation construction device includes a pile hole; a steel reinforcement cage; a grouting mechanism, wherein the grouting pipes are symmetrically welded inside the steel reinforcement cage, and two ends of the connecting rod are respectively fixedly connected to the grouting pipes and the conical pointed head; a suction mechanism, wherein a suction pipe is installed inside the steel reinforcement cage, and the bottom end of the suction pipe is fixedly connected to the second piston; the second piston and the suction pipe are slidably connected inside the sliding rod, limit blocks are symmetrically installed inside the sliding rod, and the limit blocks abut against the second piston; a lifting mechanism; a protection mechanism, wherein the bottom end of the cylinder body is fixedly connected to the cover plate, and an annular rubber pad is installed on the side wall of the cover plate; the bottom end of the cover plate is fixedly connected to the fixed ring; a connection mechanism. The composite foundation construction device and the construction method thereof provided by the present invention have the advantages of reducing the sediment inside the pile hole and preventing the grouting pipe from being blocked by mortar.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation construction, and particularly to a composite foundation construction device and a construction method thereof. Background Art

[0002] During the foundation treatment process, some soil masses are strengthened, or replaced, or reinforcing materials are set in the natural foundation to form a composite foundation, which is a commonly used foundation form in engineering construction. The composite foundation formed by foundation treatment enhances the bearing capacity of the foundation and reduces the foundation settlement. It accounts for a large proportion in the artificial foundation formed by foundation treatment and shows a development trend. However, due to the current composite foundation design, there is a situation where the elevation surface of the composite foundation is higher than the foundation structure surface, and the composite foundation is close to the foundation structure. Therefore, if the traditional construction procedure is adopted, that is, the composite foundation is completed first and then the foundation structure is constructed, during the foundation excavation process, due to the need for earthwork excavation slope, part of the composite foundation will be damaged during the construction process, reducing the bearing capacity of the foundation and laying a hidden danger for building settlement. Therefore, some foundation construction methods adopt the top-down method. The top-down method is to construct the basement floors underground from top to bottom. By relying on the self-capacity of the underground structure to support the foundation pit, the earthwork excavation of the foundation pit is ensured. By using the horizontal stiffness and compressive strength of the concrete structure floors at each underground layer, each floor slab becomes the horizontal support point of the foundation pit retaining pile (wall), and the self-balance of the earth pressure (including passive earth pressure) in different directions outside the foundation pit is used to offset the adverse effects on the retaining wall of the foundation pit. Therefore, in the top-down method construction, generally, the surrounding retaining walls of the underground building and the intermediate support columns (also known as middle column piles) arranged according to the column grid axis inside the building are constructed first, and then the underground beam-slab floor structure construction and the earthwork excavation under the floor slab are carried out from top to bottom.

[0003] During the top-down method construction, the entire structural construction load is mainly borne by the intermediate support columns and the diaphragm wall. Therefore, it is very important to control the differential settlement of the entire structure. To improve the vertical bearing capacity of the diaphragm wall and the intermediate support columns and reduce the settlement difference, compaction grouting can be carried out at the bottom of the wall and the column. When the middle column piles are bored cast-in-place piles, during the pile hole construction process, due to careless inspection, incomplete hole cleaning, and no secondary cleaning, this will cause sediment at the bottom of the pile. In addition, when the steel bars are hoisted and placed, if the steel bars are not aligned with the hole position and the steel bars scrape the hole wall when entering the pile hole, resulting in soil collapse at the bottom of the pile, causing excessive sediment in the pile hole, reducing the quality of the cast-in-place pile. And when the cast-in-place pile is being poured, the mortar in the pile hole is likely to enter the inside of the grouting pipe, causing blockage inside the grouting pipe, resulting in the inability to carry out compaction grouting at the bottom of the pile.

[0004] Therefore, it is necessary to provide a new composite foundation construction device and a construction method thereof to solve the above technical problems. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide a composite foundation construction device and a construction method thereof that can reduce the sediment inside the pile hole and prevent the mortar from blocking the grouting pipe.

[0006] To solve the above technical problem, the composite foundation construction device provided by the present invention includes: a pile hole; a steel reinforcement cage disposed inside the pile hole; a grouting mechanism including a grouting pipe, a pointed head, a connecting rod, a first spring, a first piston, a first through hole, and a groove. The grouting pipes are symmetrically welded inside the steel reinforcement cage. The two ends of the connecting rod are respectively fixedly connected to the grouting pipe and the conical pointed head. A plurality of the first through holes are obliquely provided on the side wall of the connecting rod. The first piston is slidably connected inside the pointed head and the connecting rod. The first spring is installed inside the pointed head, and the top end of the first spring is connected to the first piston. The groove is provided between the side walls of the pointed head and the connecting rod; a suction mechanism including a suction pipe, a second piston, a sliding rod, a connecting hose, a cylinder, and a limiting block. The suction pipe is installed inside the steel reinforcement cage, and the bottom end of the suction pipe is fixedly connected to the second piston. The second piston and the suction pipe are slidably connected inside the sliding rod. The limiting blocks are symmetrically installed inside the sliding rod and abut against the second piston. The sliding rod is slidably connected to the cylinder, and the two ends of the connecting hose are respectively connected to the cylinder and the sliding rod; a lifting mechanism installed inside the cylinder; a protection mechanism including a rubber pad, a fixing ring, a cover plate, and a second through hole. The bottom end of the cylinder is fixedly connected to the cover plate, and the annular rubber pad is installed on the side wall of the cover plate. The fixing ring is fixedly connected to the bottom end of the cover plate, and a plurality of the second through holes are provided on the side wall of the fixing ring; a connecting mechanism connecting the cover plate and the connecting rod.

[0007] Preferably, the connecting mechanism includes a fixing sleeve, a third spring, a convex block, and a third through hole. The fixing sleeves are symmetrically installed inside the cover plate and are slidably connected to the grouting pipe. The third spring is installed inside the connecting rod. The third spring is connected to the convex block, and the convex block is slidably connected inside the connecting rod and the fixing sleeve.

[0008] Preferably, the inner parts of the bottom ends of the connecting rod and the fixing sleeve are respectively in a frustum shape, and the inside of the connecting rod communicates with the grouting pipe.

[0009] Preferably, the maximum inner diameter of the groove is smaller than the maximum diameter of the connecting rod, and the maximum diameter of the pointed head is larger than the maximum diameter of the connecting rod.

[0010] Preferably, the lifting mechanism includes a limiting ring, a first magnet, a second magnet, a second spring, a partition board, a support rod, a clamping block and a fixing block. The limiting ring is installed on the side wall of the sliding rod, and the limiting ring abuts against the top surface of the cylinder body; The partition board and the fixing block are installed inside the cylinder body. The support rod is slidably connected inside the partition board, and the two ends of the support rod are respectively fixedly connected to the clamping block and the second magnet, and the second magnet is fixed on the side wall of the sliding rod; The first magnet is installed at the top end of the cylinder body. The first magnet adsorbs the second magnet and the iron limiting ring, and the first magnet is slidably connected with the sliding rod; The second springs are symmetrically installed inside the cylinder body, and the two ends of the second springs are respectively fixedly connected to the partition board and the second magnet.

[0011] Preferably, the bottom end of the clamping block is of a hemispherical structure, the top end of the clamping block is of a frustum-shaped structure, the inside of the fixing block is of a hollow funnel shape, and the minimum inner diameter of the fixing block is larger than the minimum diameter of the clamping block.

[0012] Preferably, the bottom end of the connecting hose is located between the fixing block and the partition board, and the top end of the connecting hose is located between the limiting ring and the limiting block.

[0013] Preferably, the inside of the cover plate is of a hollow funnel shape structure, and the cross section of the side wall of the fixing ring is of a triangular structure.

[0014] Preferably, the heights of both the grouting pipe and the suction pipe are higher than the height of the steel reinforcement cage, and the height of the grouting pipe is greater than the height of the suction pipe.

[0015] Preferably, a composite foundation construction method includes the following steps:

[0016] Step 1: After the pile hole is formed and cleaned, use a steel wire to tie the suction pipe to the side wall of the steel reinforcement cage. At this time, the fixing sleeve does not contact the connecting rod. Use a crane to lift the steel reinforcement cage and place the steel reinforcement cage into the pile hole. At this time, the pointed head contacts the bottom end of the pile hole, and connect the suction pipe and the grouting pipe to the water pump respectively;

[0017] Step 2: Turn on the water pump so that water continuously enters the inside of the grouting pipe and the connecting rod through the water pump. The water pushes the first piston into the inside of the pointed head to compress the first spring, and the water sprays upward through the first through hole and the groove, driving the sediment deposited at the bottom end of the pile hole to move upward; at this time, another water pump operates to generate suction inside the suction pipe, the sliding rod, the connecting hose and the cylinder. Due to the blockage of the cover plate, the sediment and sewage from the bottom end of the pile hole continuously enter the inside of the cylinder, cleaning the sediment at the bottom end of the pile hole; as water continuously enters the pile hole, due to the blockage of the clamping block, the distance between the clamping block and the fixed block is small, and the amount of water sprayed out from the groove is greater than the amount of water entering the inside of the cylinder. The water accumulates at the bottom end of the pile hole and contacts the cover plate and the rubber pad. The water pushes the elastic rubber pad upward to expand, so that the rubber pad tightly adheres to the side wall of the pile hole, thereby accumulating water below the rubber pad, increasing the extrusion force of the water on the rubber pad and the cover plate, and thus pushing the cover plate, the cylinder and the sliding rod upward, so that the suction pipe abuts against the limit block. At this time, the cover plate no longer moves, and the water pressure below the cover plate gradually increases. When the thrust of the water on the cover plate is greater than the upward resistance of the cover plate, the cover plate drives the cylinder and the first magnet upward. The first magnet moves away from the second magnet. At this time, the movement resistance of the cover plate suddenly decreases, accelerating the upward movement speed of the cover plate and the cylinder. The movement of the cylinder along the sliding rod compresses the second spring. When the first magnet abuts against and adsorbs the limit ring, the cylinder stops moving upward. At this time, the distance between the fixed block and the clamping block is large, so that a large amount of accumulated water and sediment in the pile hole enter the inside of the suction pipe through the fixed block and the cylinder. The amount of water sprayed out from the groove is less than the amount of water entering the inside of the cylinder. When the cylinder moves to the highest point and then slowly slides down, due to the certain thrust of the water at the bottom end of the pile hole on the cover plate, and the first magnet adsorbs the limit ring, the cover plate, the cylinder, the first magnet, the limit ring and the sliding rod move downward synchronously, so that the sediment and accumulated water inside the pile hole are quickly discharged through the suction pipe. As the water level inside the pile hole continuously drops, the thrust of the water on the cover plate gradually decreases, and the downward movement force of the cover plate is greater than the suction force between the first magnet and the limit ring, and the cover plate and the cylinder gradually return downward; as water continuously enters the inside of the pile hole, the cover plate continuously moves up and down inside the pile hole. When the cover plate moves upward, the water pressure at the bottom end of the pile hole is continuously increased. When the cover plate moves downward, the fixed block is completely opened, so that the water and sediment inside the pile hole quickly enter the inside of the cylinder, which is beneficial to quickly cleaning the sediment inside the pile hole;

[0018] Step 3: After the sediment cleaning is completed, drain the accumulated water inside the pile hole through the suction pipe, remove the steel wire on the surface of the suction pipe, separate the suction pipe from the steel reinforcement cage, release the suction pipe, and the suction pipe moves upward to squeeze the limit block, the sliding rod, the cylinder body, the cover plate and the fixed sleeve, so that the fixed sleeve contacts the connecting rod, squeezes the steel reinforcement cage, and makes the pointed head and the fixed ring enter the soil layer. Inject sodium silicate into the inside of the suction pipe, so that the sodium silicate fills the inside of the cover plate, and part of the sodium silicate enters the bottom surface of the pile hole through the second through hole to cover the bottom surface of the pile hole, preventing mortar from entering the soil layer;

[0019] Step 4: Pour concrete into the pile hole until the pile hole is filled. The concrete squeezes the cover plate to make the cover plate closely adhere to the soil layer surface. At the same time, the sodium silicate on the soil layer surface blocks the downward leakage of the mortar, reducing the probability of the mortar contacting the groove; After 3 to 7 days of concrete pouring, connect the grouting pipe to a high-pressure grouting machine, and let the mortar enter the inside of the groove through the grouting pipe, so that the mortar enters the soil layer inside through the groove, and perform compaction grouting on the cast-in-place pile to improve the strength and quality of the cast-in-place pile.

[0020] Compared with the related technology, the composite foundation construction device and its construction method provided by the present invention have the following beneficial effects:

[0021] The present invention provides a composite foundation construction device and a construction method thereof. After the steel reinforcement cage enters the inside of the pile hole, water sprays upward through the first through hole and the groove, driving the sediment deposited at the bottom end of the pile hole to move upward. At this time, the water pump operates to generate suction inside the suction pipe, the sliding rod, the connecting hose and the cylinder body. Due to the blockage of the cover plate, the sediment and sewage at the bottom end of the pile hole continuously enter the inside of the cylinder body to clean the sediment at the bottom end of the pile hole. As water continuously enters the pile hole, due to the blockage of the lifting mechanism, the amount of water sprayed out from the groove is greater than the amount of water entering the inside of the cylinder body. The water deposits at the bottom end of the pile hole and contacts the cover plate and the rubber pad. The water pushes the elastic rubber pad upward to expand, so that the rubber pad tightly adheres to the side wall of the pile hole, thereby accumulating water below the rubber pad, making the extrusion force of the water on the rubber pad and the cover plate increase more and more, thereby pushing the cover plate, the cylinder body and the sliding rod upward, so that the suction pipe abuts against the limit block. At this time, the cover plate no longer continues to move, and the water pressure below the cover plate gradually increases. When the thrust of the water on the cover plate is greater than the upward resistance of the cover plate, the cover plate drives the cylinder body to move upward. The cylinder body abuts against the limit ring and then stops moving upward. At this time, without the blockage of the lifting mechanism, a large amount of accumulated water and sediment in the pile hole enter the inside of the suction pipe through the fixed block and the cylinder body. The amount of water sprayed out from the groove is less than the amount of water entering the inside of the cylinder body. When the cylinder body moves to the highest point and then slowly slides downward, at this time, the cover plate, the cylinder body, the limit ring and the sliding rod move downward synchronously, so that the sediment and accumulated water inside the pile hole are quickly discharged through the suction pipe. As the water level inside the pile hole continuously drops, the thrust of the water on the cover plate gradually decreases. The downward movement force of the cover plate is greater than the suction force between the first magnet and the limit ring, and the cover plate and the cylinder body gradually return downward. As water continuously enters the inside of the pile hole, the cover plate continuously moves up and down inside the pile hole. When the cover plate moves upward, the water pressure at the bottom end of the pile hole is continuously increased. When the cover plate moves downward, the fixed block is completely opened, so that the water and sediment inside the pile hole quickly enter the inside of the cylinder body, which is beneficial to quickly cleaning the sediment inside the pile hole. After the sediment cleaning is completed, the cover plate moves downward, so that the pointed head and the fixed ring enter the soil layer, and the cover plate covers the remaining sediment inside the pile hole. Inject sodium silicate into the inside of the suction pipe, so that the inside of the cover plate is filled with sodium silicate. Part of the sodium silicate enters the bottom surface of the pile hole through the second through hole to cover the bottom surface of the pile hole, preventing mortar from entering the soil layer. At the same time, a small amount of remaining sediment inside the pile hole is mixed in the sodium silicate, so that the sediment remains on the bottom surface of the pile hole, preventing the sediment from mixing into the inside of the concrete;When concrete is added into the pile hole, the concrete squeezes the cover plate, making the cover plate closely adhere to the soil layer surface. At the same time, the sodium silicate on the soil layer surface blocks the downward leakage of the mortar, reducing the probability of the mortar contacting the groove and avoiding the blockage of the first through hole, which is convenient for people to perform grouting. Description of the Drawings

[0022] Figure 1 Structural schematic diagram of the composite foundation construction device and its construction method provided by the present invention;

[0023] Figure 2 is Figure 1 Enlarged schematic diagram of the structure at A shown;

[0024] Figure 3 is Figure 2 Enlarged schematic diagram of the structure at B shown;

[0025] Figure 4 is Figure 2 Top view of the cover plate structure shown;

[0026] Figure 5 is Figure 1 Internal structural schematic diagram of the bottom end of the pile hole shown;

[0027] Figure 6 is Figure 2 Structural schematic diagram of the fixing ring shown.

[0028] Reference numerals in the figures: 1, pile hole; 2, steel reinforcement cage; 3, grouting mechanism; 31, grouting pipe; 32, pointed head; 33, connecting rod; 34, first spring; 35, first piston; 36, first through hole; 37, groove; 4, protection mechanism; 41, rubber pad; 42, fixing ring; 43, cover plate; 44, second through hole; 5, suction mechanism; 51, suction pipe; 52, second piston; 53, sliding rod; 54, connecting hose; 55, cylinder body; 56, limit block; 6, lifting mechanism; 61, limit ring; 62, first magnet; 63, second magnet; 64, second spring; 65, partition plate; 66, support rod; 67, clamping block; 68, fixing block; 7, connecting mechanism; 71, fixing sleeve; 72, third spring; 73, convex block; 74, third through hole. Detailed Embodiments

[0029] The present invention will be further described below in conjunction with the drawings and embodiments.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 Among them, Figure 1Structural schematic diagram of the composite foundation construction device and its construction method provided by the present invention; Figure 2 is Figure 1 Enlarged schematic diagram of the structure at position A shown in the figure; Figure 3 is Figure 2 Enlarged schematic diagram of the structure at position B shown in the figure; Figure 4 is Figure 2 Top view of the cover plate structure shown in the figure; Figure 5 is Figure 1 Internal structural schematic diagram of the bottom end of the pile hole shown in the figure; Figure 6 is Figure 2 Schematic diagram of the fixed ring structure shown in the figure. The composite foundation construction device includes: a pile hole 1; a steel reinforcement cage 2, and the steel reinforcement cage 2 is arranged inside the pile hole 1; a grouting mechanism 3, and the grouting mechanism 3 includes a grouting pipe 31, a pointed head 32, a connecting rod 33, a first spring 34, a first piston 35, a first through hole 36 and a groove 37. The grouting pipes 31 are symmetrically welded inside the steel reinforcement cage 2, and the two ends of the connecting rod 33 are respectively fixedly connected to the grouting pipe 31 and the conical pointed head 32; a plurality of the first through holes 36 are obliquely arranged on the side wall of the connecting rod 33, and the first piston 35 is slidably connected inside the pointed head 32 and the connecting rod 33; the first spring 34 is installed inside the pointed head 32, and the top end of the first spring 34 is connected to the first piston 35, and the groove 37 is arranged between the side walls of the pointed head 32 and the connecting rod 33; a suction mechanism 5, and the suction mechanism 5 includes a suction pipe 51, a second piston 52, a sliding rod 53, a connecting hose 54, a cylinder body 55 and a limiting block 56. The suction pipe 51 is installed inside the steel reinforcement cage 2, and the bottom end of the suction pipe 51 is fixedly connected to the second piston 52; the second piston 52 and the suction pipe 51 are slidably connected inside the sliding rod 53, and the limiting blocks 56 are symmetrically installed inside the sliding rod 53, and the limiting blocks 56 abut against the second piston 52; the sliding rod 53 is slidably connected with the cylinder body 55, and the two ends of the connecting hose 54 are respectively connected to the cylinder body 55 and the sliding rod 53; a lifting mechanism 6, and the lifting mechanism 6 is installed inside the cylinder body 55; a protection mechanism 4, and the protection mechanism 4 includes a rubber pad 41, a fixed ring 42, a cover plate 43 and a second through hole 44. The bottom end of the cylinder body 55 is fixedly connected to the cover plate 43, and the annular rubber pad 41 is installed on the side wall of the cover plate 43; the bottom end of the cover plate 43 is fixedly connected to the fixed ring 42, and a plurality of the second through holes 44 are arranged on the side wall of the fixed ring 42; a connecting mechanism 7, and the connecting mechanism 7 connects the cover plate 43 and the connecting rod 33.

[0031] The connecting mechanism 7 includes a fixed sleeve 71, a third spring 72, a convex block 73 and a third through hole 74. The fixed sleeves 71 are symmetrically installed inside the cover plate 43, and the fixed sleeves 71 are slidably connected to the grouting pipes 31; the third spring 72 is installed inside the connecting rod 33, the third spring 72 is connected to the convex block 73, and the convex block 73 is slidably connected to the inside of the connecting rod 33 and the fixed sleeve 71. The inner parts of the bottom ends of the connecting rod 33 and the fixed sleeve 71 are respectively in a frustum shape, and the inside of the connecting rod 33 communicates with the grouting pipe 31. In order to facilitate the movement of the fixed sleeve 71 along the grouting pipe 31 and contact with the connecting rod 33, the fixed sleeve 71 squeezes the convex block 73 with a hemispherical end into the inside of the connecting rod 33 to compress the third spring 72. When the third through hole 74 is aligned with the convex block 73, the third spring 72 extends to push the convex block 73 into the inside of the third through hole 74, so that the fixed sleeve 71 and the connecting rod 33 are fixed together.

[0032] The maximum inner diameter of the groove 37 is smaller than the maximum diameter of the connecting rod 33. When the liquid drips from the side wall of the connecting rod 33, the liquid moves downward along the connecting rod 33 and enters the side wall of the pointed head 32, reducing the probability of the liquid entering the inside of the groove 37. And the maximum diameter of the pointed head 32 is larger than the maximum diameter of the connecting rod 33. When the pointed head 32 enters the soil layer, the soil moves to the four sides along the side wall of the pointed head 32, preventing a large amount of soil from falling into the inside of the groove 37.

[0033] The lifting mechanism 6 includes a limit ring 61, a first magnet 62, a second magnet 63, a second spring 64, a partition plate 65, a support rod 66, a clamping block 67 and a fixing block 68. The limit ring 61 is installed on the side wall of the sliding rod 53, and the limit ring 61 abuts against the top surface of the cylinder body 55. The partition plate 65 and the fixing block 68 are installed inside the cylinder body 55. The support rod 66 is slidably connected inside the partition plate 65, and the two ends of the support rod 66 are respectively fixedly connected to the clamping block 67 and the second magnet 63. The second magnet 63 is fixed on the side wall of the sliding rod 53. The first magnet 62 is installed at the top end of the cylinder body 55. The first magnet 62 adsorbs the second magnet 63 and the iron limit ring 61, and the first magnet 62 is slidably connected with the sliding rod 53. The second springs 64 are symmetrically installed inside the cylinder body 55, and the two ends of the second springs 64 are respectively fixedly connected to the partition plate 65 and the second magnet 63.The bottom end of the clamping block 67 is in a hemispherical structure. For the convenience of water flow, the top end of the clamping block 67 is in a frustum shape. The inside of the fixing block 68 is in a hollow funnel shape, and the minimum inner diameter of the fixing block 68 is larger than the minimum diameter of the clamping block 67. When water continuously enters the pile hole 1, due to the blockage of the clamping block 67, the distance between the clamping block 67 and the fixing block 68 is small, and the amount of water sprayed out from the groove 37 is greater than the amount of water entering the inside of the cylinder body 55. The water deposits at the bottom end of the pile hole 1 and contacts the cover plate 43 and the rubber pad 41. The water pushes the elastic rubber pad 41 upward to expand, so that the rubber pad 41 closely adheres to the side wall of the pile hole 1, thereby accumulating water below the rubber pad 41, making the extrusion force of the water on the rubber pad 41 and the cover plate 43 increase more and more, thereby pushing the cover plate 43, the cylinder body 55 and the sliding rod 53 upward, so that the suction pipe 51 abuts against the limit block 56. At this time, the cover plate 43 no longer moves upward. The water pressure below the cover plate 43 gradually increases. When the thrust of the water on the cover plate 43 is greater than the upward resistance of the cover plate 43, the cover plate 43 drives the cylinder body 55 and the first magnet 62 upward. The first magnet 62 moves away from the second magnet 63. At this time, the movement resistance of the cover plate 43 suddenly decreases, accelerating the upward movement speed of the cover plate 43 and the cylinder body 55. The movement of the cylinder body 55 along the sliding rod 53 compresses the second spring 64. When the first magnet 62 abuts against and adsorbs the limit ring 61, the cylinder body 55 stops moving upward. At this time, the distance between the fixing block 68 and the clamping block 67 is large, so that a large amount of accumulated water and sediment in the pile hole pass through the fixing block 38 and the cylinder body 55 into the inside of the suction pipe 51. The amount of water sprayed out from the groove 37 is less than the amount of water entering the inside of the cylinder body 55. When the cylinder body 55 moves to the highest point and then slowly slides downward, due to the certain thrust of the water at the bottom end of the pile hole on the cover plate 43, and the first magnet 62 adsorbs the limit ring 61, the cover plate 43, the cylinder body 55, the first magnet 62, the limit ring 61 and the sliding rod 53 move downward synchronously, so that the sediment and accumulated water inside the pile hole are quickly discharged through the suction pipe 51. As the water level inside the pile hole 1 continuously drops, the thrust of the water on the cover plate 43 gradually decreases. The downward movement force of the cover plate 43 is greater than the suction force between the first magnet 62 and the limit ring 61, and the cover plate 43 and the cylinder body 55 gradually return downward. As water continuously enters the inside of the pile hole 1, the cover plate 43 continuously moves up and down inside the pile hole 1.

[0034] The bottom end of the connecting hose 54 is located between the fixed block 68 and the partition plate 65 to facilitate the water inside the cylinder body 55 to enter the inside of the connecting hose 54; the top end of the connecting hose 54 is located between the limiting ring 61 and the limiting block 56 to facilitate the water inside the connecting hose 54 to enter the inside of the sliding rod 53.

[0035] The inside of the cover plate 43 is of a hollow funnel-shaped structure to facilitate the sewage inside the pile hole 1 to enter the inside of the cylinder body 55 along the cover plate 43, and the cross-section of the side wall of the fixed ring 42 is of a triangular structure to facilitate the downward movement of the fixed ring 42 into the soil layer.

[0036] The heights of the grouting pipe 31 and the suction pipe 51 are both higher than the height of the steel reinforcement cage 2 and the height of the grouting pipe 31 is greater than the height of the suction pipe 51 to facilitate the input or output of substances into or from the grouting pipe 31 and the suction pipe 51.

[0037] A composite foundation construction method includes the following steps:

[0038] Step 1: After the pile hole 1 is formed and cleaned, use a steel wire to tie the suction pipe 51 to the side wall of the steel reinforcement cage 2. At this time, the fixed sleeve 71 does not contact the connecting rod 33. Use a crane to lift the steel reinforcement cage 2 and place the steel reinforcement cage 2 into the inside of the pile hole 1. At this time, the pointed head 32 contacts the bottom end of the pile hole 1, and connect the suction pipe 51 and the grouting pipe 31 to the water pump respectively;

[0039] Step 2: Turn on a water pump so that water continuously enters the inside of the grouting pipe 31 and the connecting rod 33 through the water pump. The water pushes the first piston 35 into the inside of the pointed head 32 to compress the first spring 34, and the water sprays upward through the first through hole 36 and the groove 37, driving the sediment deposited at the bottom end of the pile hole 1 to move upward; at this time, another water pump operates to generate suction inside the suction pipe 51, the sliding rod 53, the connecting hose 54 and the cylinder body 55. Due to the blockage of the cover plate 43, the sediment and sewage at the bottom end of the pile hole 1 continuously enter the inside of the cylinder body 55 to clean the sediment at the bottom end of the pile hole 1; as water continuously enters the pile hole 1, due to the blockage of the clamping block 67, the distance between the clamping block 67 and the fixed block 68 is small, and the amount of water sprayed out of the groove 37 is greater than the amount of water entering the inside of the cylinder body 55. The water deposits at the bottom end of the pile hole 1 and contacts the cover plate 43 and the rubber pad 41. The water pushes the elastic rubber pad 41 upward to expand, so that the rubber pad 41 closely adheres to the side wall of the pile hole 1, thereby accumulating water below the rubber pad 41, making the extrusion force of the water on the rubber pad 41 and the cover plate 43 greater and greater, thereby pushing the cover plate 43, the cylinder body 55 and the sliding rod 53 upward, so that the suction pipe 51 abuts against the limit block 56 (as shown in the appendix Figure 5As shown, at this time, the cover plate 43 no longer moves continuously. The water pressure below the cover plate 43 gradually increases. When the thrust of the water on the cover plate 43 is greater than the upward resistance of the cover plate 43, the cover plate 43 drives the cylinder body 55 and the first magnet 62 to move upward. The first magnet 62 moves away from the second magnet 63. At this time, the movement resistance of the cover plate 43 suddenly decreases, accelerating the upward movement speed of the cover plate 43 and the cylinder body 55. The movement of the cylinder body 55 along the slide bar 53 compresses the second spring 64. When the first magnet 62 abuts and adsorbs the limit ring 61, the cylinder body 55 stops moving upward. At this time, the distance between the fixed block 68 and the clamping block 67 is large, enabling a large amount of accumulated water and sediment in the pile hole to enter the interior of the suction pipe 51 through the fixed block 38 and the cylinder body 55. The amount of water sprayed out from the groove 37 is less than the amount of water entering the interior of the cylinder body 55. When the cylinder body 55 moves to the highest point and then slowly slides downward, due to the certain thrust of the water at the bottom of the pile hole on the cover plate 43 and the adsorption of the first magnet 62 to the limit ring 61, the cover plate 43, the cylinder body 55, the first magnet 62, the limit ring 61, and the slide bar 53 move downward synchronously, enabling the sediment and accumulated water inside the pile hole to be quickly discharged through the suction pipe 51. As the water level inside the pile hole 1 continuously drops, the thrust of the water on the cover plate 43 gradually decreases. The downward movement force of the cover plate 43 is greater than the suction force between the first magnet 62 and the limit ring 61, and the cover plate 43 and the cylinder body 55 gradually return downward. As water continuously enters the interior of the pile hole 1, the cover plate 43 continuously moves up and down inside the pile hole 1. When the cover plate 43 moves upward, the water pressure at the bottom of the pile hole 1 is continuously increased. When the cover plate 43 moves downward, the fixed block 68 is completely opened, enabling the water and sediment inside the pile hole 1 to quickly enter the interior of the cylinder body 55, thus facilitating the rapid cleaning of the sediment inside the pile hole 1;

[0040] Step 3: After the sediment cleaning is completed, drain the accumulated water inside the pile hole 1 through the suction pipe 51, separate the water pump from the suction pipe 51 and the grouting pipe 31. At this time, the first through hole 36 is closed by the first piston 35 to prevent other substances from entering the inside of the grouting pipe 31; remove the steel wire on the surface of the suction pipe 51 to separate the suction pipe 51 from the steel reinforcement cage 2, release the suction pipe 51, and the suction pipe 51 moves upward to squeeze the limit block 56, the slide bar 53, the cylinder body 55, the cover plate 43 and the fixing sleeve 71, so that the fixing sleeve 71 contacts the connecting rod 33. The fixing sleeve 71 squeezes the convex block 73 with a hemispherical end into the inside of the connecting rod 33 to compress the third spring 72. When the third through hole 74 is aligned with the convex block 73, the third spring 72 extends to push the convex block 73 into the inside of the third through hole 74, so that the fixing sleeve 71 is fixed to the connecting rod 33 (as shown in the attachment Figure 2 ); squeeze the steel reinforcement cage 2 so that the pointed head 32 and the fixing ring 42 enter the soil layer (as shown in the attachment Figure 6 ); inject sodium silicate into the inside of the suction pipe 51 to fill the inside of the cover plate 43 with sodium silicate. Part of the sodium silicate enters the bottom surface of the pile hole 1 through the second through hole 44 to cover the bottom surface of the pile hole 1 and prevent mortar from entering the soil layer.

[0041] Step 4: Add concrete into the pile hole 1 to fill the inside of the pile hole 1. The concrete squeezes the cover plate 43 and the rubber pad 41 to make the cover plate 43 and the rubber pad 41 closely adhere to the soil layer surface, increasing the sealing performance between the cover plate 43 and the soil layer. At the same time, the sodium silicate on the soil layer surface blocks the downward leakage of the mortar, reducing the probability of the mortar contacting the groove 37; after 3 to 7 days of concrete pouring, connect the grouting pipe 31 to a high-pressure grouting machine, and let the mortar enter the inside of the groove 37 through the grouting pipe 31, so that the mortar enters the soil layer through the groove 37 for pressure grouting of the cast-in-place pile to improve the strength and quality of the cast-in-place pile.

[0042] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A composite foundation construction device, characterized in that, it includes: a pile hole; a steel reinforcement cage, and the steel reinforcement cage is arranged inside the pile hole; a grouting mechanism, the grouting mechanism includes a grouting pipe, a pointed head, a connecting rod, a first spring, a first piston, a first through hole and a groove. The grouting pipes are symmetrically welded inside the steel reinforcement cage. The two ends of the connecting rod are respectively fixedly connected to the grouting pipe and the conical pointed head; a plurality of the first through holes are obliquely arranged on the side wall of the connecting rod, and the first piston is slidably connected inside the pointed head and the connecting rod; the first spring is installed inside the pointed head, and the top end of the first spring is connected to the first piston, and the groove is arranged between the side walls of the pointed head and the connecting rod; a suction mechanism, the suction mechanism includes a suction pipe, a second piston, a sliding rod, a connecting hose, a cylinder body and a limit block. The suction pipe is installed inside the steel reinforcement cage, and the bottom end of the suction pipe is fixedly connected to the second piston; the second piston and the suction pipe are slidably connected inside the sliding rod, the limit blocks are symmetrically installed inside the sliding rod, and the limit blocks abut against the second piston; the sliding rod is slidably connected with the cylinder body, and the two ends of the connecting hose are respectively connected to the cylinder body and the sliding rod; a lifting mechanism, the lifting mechanism is installed inside the cylinder body; the lifting mechanism includes a limit ring, a first magnet, a second magnet, a second spring, a partition board, a support rod, a clamping block and a fixing block. The limit ring is installed on the side wall of the sliding rod, and the limit ring abuts against the top surface of the cylinder body; the partition board and the fixing block are installed inside the cylinder body, the support rod is slidably connected inside the partition board, and the two ends of the support rod are respectively fixedly connected to the clamping block and the second magnet, and the second magnet is fixed on the side wall of the sliding rod; the first magnet is installed at the top end of the cylinder body, the first magnet adsorbs the second magnet and the iron limit ring, and the first magnet is slidably connected with the sliding rod; the second springs are symmetrically installed inside the cylinder body, and the two ends of the second spring are respectively fixedly connected to the partition board and the second magnet; a protection mechanism, the protection mechanism includes a rubber pad, a fixing ring, a cover plate and a second through hole. The bottom end of the cylinder body is fixedly connected to the cover plate, and the rubber pad in a ring shape is installed on the side wall of the cover plate; the fixing ring is fixedly connected to the bottom end of the cover plate, and a plurality of the second through holes are arranged on the side wall of the fixing ring; a connecting mechanism, the connecting mechanism connects the cover plate and the connecting rod.

2. The composite foundation construction device according to claim 1, characterized in that, the connecting mechanism includes a fixing sleeve, a third spring, a convex block and a third through hole. The fixing sleeves are symmetrically installed inside the cover plate, and the fixing sleeves are slidably connected with the grouting pipes; the third spring is installed inside the connecting rod, the third spring is connected to the convex block, and the convex block is slidably connected inside the connecting rod and the fixing sleeve.

3. The composite foundation construction device according to claim 2, characterized in that, The inner parts of the bottom ends of the connecting rod and the fixing sleeve are respectively in the shape of a frustum of a cone, and the inside of the connecting rod communicates with the grouting pipe.

4. The composite foundation construction device according to claim 3, wherein, the maximum inner diameter of the groove is smaller than the maximum diameter of the connecting rod, and the maximum diameter of the pointed head is larger than the maximum diameter of the connecting rod.

5. The composite foundation construction device according to claim 4, wherein, the bottom end of the clamping block is in the shape of a hemisphere, the top end of the clamping block is in the shape of a frustum of a cone, the inside of the fixing block is in the shape of a hollow funnel, and the minimum inner diameter of the fixing block is larger than the minimum diameter of the clamping block.

6. The composite foundation construction device according to claim 5, wherein, the bottom end of the connecting hose is located between the fixing block and the partition board, and the top end of the connecting hose is located between the limiting ring and the limiting block.

7. The composite foundation construction device according to claim 6, wherein, the inside of the cover plate is in the shape of a hollow funnel structure, and the cross-section of the side wall of the fixing ring is in the shape of a triangle.

8. The composite foundation construction device according to claim 7, wherein, the heights of the grouting pipe and the suction pipe are both higher than the height of the steel reinforcement cage, and the height of the grouting pipe is greater than the height of the suction pipe.

9. The construction method of the composite foundation construction device according to claim 8, wherein, comprises the following steps: Step 1: After the pile hole is formed and cleaned, use a steel wire to tie the suction pipe to the side wall of the steel reinforcement cage. At this time, the fixing sleeve does not contact the connecting rod. Use a crane to lift the steel reinforcement cage and place the steel reinforcement cage into the inside of the pile hole. At this time, the pointed head contacts the bottom end of the pile hole. Connect the suction pipe and the grouting pipe to a water pump respectively; Step 2: Turn on the water pump so that water continuously enters the inside of the grouting pipe and the connecting rod through the water pump. The water pushes the first piston into the inside of the pointed head to compress the first spring, and the water sprays upward through the first through hole and the groove, driving the sediment deposited at the bottom end of the pile hole to move upward; at this time, another water pump operates to generate suction inside the suction pipe, the sliding rod, the connecting hose and the cylinder body. Due to the blockage of the cover plate, the sediment and sewage from the bottom end of the pile hole continuously enter the inside of the cylinder body to clean the sediment at the bottom end of the pile hole; as water continuously enters the pile hole, due to the blockage of the clamping block, the distance between the clamping block and the fixed block is small, and the amount of water sprayed out from the groove is greater than the amount of water entering the inside of the cylinder body. The water accumulates at the bottom end of the pile hole and contacts the cover plate and the rubber pad. The water pushes the elastic rubber pad upward to open it, so that the rubber pad clings to the side wall of the pile hole, thereby accumulating water below the rubber pad, and the squeezing force of the water on the rubber pad and the cover plate becomes larger and larger, thereby pushing the cover plate, the cylinder body and the sliding rod upward, so that the suction pipe abuts against the limit block. At this time, the cover plate no longer continues to move, and the water pressure below the cover plate gradually increases. When the thrust of the water on the cover plate is greater than the upward resistance of the cover plate, the cover plate drives the cylinder body and the first magnet upward. The first magnet moves away from the second magnet. At this time, the movement resistance of the cover plate suddenly decreases, accelerating the upward movement speed of the cover plate and the cylinder body. The upward movement of the cylinder body along the sliding rod compresses the second spring. When the first magnet abuts against and adsorbs the limit ring, the cylinder body stops moving upward. At this time, the distance between the fixed block and the clamping block is large, so that a large amount of accumulated water and sediment in the pile hole enter the inside of the suction pipe through the fixed block and the cylinder body. The amount of water sprayed out from the groove is less than the amount of water entering the inside of the cylinder body. When the cylinder body moves to the highest point and then slowly slides downward, due to the certain thrust of the water at the bottom end of the pile hole on the cover plate and the first magnet adsorbing the limit ring, the cover plate, the cylinder body, the first magnet, the limit ring and the sliding rod move downward synchronously, so that the sediment and accumulated water inside the pile hole are quickly discharged through the suction pipe. As the water level inside the pile hole continuously drops, the thrust of the water on the cover plate gradually decreases, and the downward movement force of the cover plate is greater than the suction force between the first magnet and the limit ring, and the cover plate and the cylinder body gradually return downward; as water continuously enters the inside of the pile hole, the cover plate continuously moves up and down inside the pile hole. When the cover plate moves upward, the water pressure at the bottom end of the pile hole is continuously increased. When the cover plate moves downward, the fixed block is completely opened, so that the water and sediment inside the pile hole quickly enter the inside of the cylinder body, which is beneficial to quickly cleaning the sediment inside the pile hole; Step 3: After the sediment cleaning is completed, drain the accumulated water inside the pile hole through the suction pipe, remove the steel wire on the surface of the suction pipe, separate the suction pipe from the steel reinforcement cage, release the suction pipe, and the suction pipe moves upward to squeeze the limit block, the sliding rod, the cylinder body, the cover plate and the fixed sleeve, so that the fixed sleeve contacts the connecting rod, squeezes the steel reinforcement cage, and makes the pointed head and the fixed ring enter the soil layer. Inject sodium silicate into the inside of the suction pipe, so that the sodium silicate fills the inside of the cover plate, and part of the sodium silicate enters the bottom surface of the pile hole through the second through hole to cover the bottom surface of the pile hole, preventing the mortar from entering the soil layer; Step 4: Add concrete into the pile hole until the pile hole is filled with concrete. The concrete squeezes the cover plate to make the cover plate closely adhere to the soil surface. At the same time, the sodium silicate on the soil surface blocks the downward leakage of the mortar, reducing the chance of the mortar contacting the groove; When the concrete is poured for [number of days] days, connect the grouting pipe to the high-pressure grouting machine, and let the mortar enter the inside of the groove through the grouting pipe, so that the mortar enters the soil layer through the groove to perform compaction grouting on the cast-in-place pile, improving the strength and quality of the cast-in-place pile.

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