A pile grouting device and method based on ring rotation control

Abstract

The application relates to the technical field of building engineering construction, in particular to a pile grouting device and method based on ring rotary method control. The pile grouting device based on the ring rotary method control comprises a steel reinforcement main cage; two groups of post-grouting mechanisms are symmetrically arranged in the steel reinforcement main cage; a grouting pipe is arranged on a vertical rib of an L-shaped supporting rib; a grout valve mechanism is arranged at the bottom end of the grouting pipe; the grout valve mechanism comprises a grouting sleeve which is screw-connected to the bottom end of the grouting pipe; a plurality of grouting holes are evenly arranged on the outer wall of the grouting sleeve; a drill bit is movably arranged at the end of the grouting sleeve away from the grouting pipe; a valve core assembly is arranged at the end of the drill bit extending into the grouting sleeve; and a traction assembly is arranged at the top end of the grouting pipe. The pile grouting device and method based on the ring rotary method control have the advantages that the grout valve mechanism can be stably arranged in the soil under the pile bottom, and the post-grouting can be efficiently and high-qualityly carried out.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a pile grouting device and method based on ring rotation control. Background Technology

[0002] With the development of society, there are many more buildings that require cast-in-place pile foundations. The post-grouting technology at the pile tip and pile side of cast-in-place piles has become a common foundation treatment solution chosen by building structural designers. Post-grouting solidifies the sediment and mud cake of the cast-in-place piles, strengthens the soil within a certain range, improves the bearing capacity of a single pile, and reduces building settlement.

[0003] When using post-grouting reinforced concrete cast-in-place piles, cement grout is injected under high pressure into the pile perimeter and pile tip through grouting pipes pre-embedded in the reinforcing cage, tied to the design dimensions. This solidifies sediment, reinforces the soil, significantly increases the bearing capacity of a single pile, and reduces pile foundation settlement. The post-grouting valve at the pile tip should be placed in the soil beneath the pile, and it is essential to ensure that the grouting valve can open smoothly in order to carry out grouting according to design requirements.

[0004] However, in practice, due to limitations in site conditions, construction workers can only control the top elevation of the rebar cage when placing it, without knowing whether the bottom elevation is in the designed position, and consequently, the location of the pile-end grouting valve. Currently, it is also impossible to detect whether the pile-end grouting valve is in place. In fact, because the design length of the rebar cage is generally tens of meters, it needs to be processed in sections. Errors in the connection of multiple sections during placement can shorten the actual length of the rebar cage. During concrete pouring, the rebar cage is prone to floating due to external forces such as the guide pipe hook. Improper measures during cage fixing can also lead to significant upward deviations in the bottom elevation of the rebar cage. Furthermore, inaccurate measurements, lack of operational expertise, and excessively deep drilling can all result in a certain distance between the rebar cage and the bottom of the hole, leaving the pile-end grouting valve "suspended" and embedded in the concrete during pouring. One week later, during grouting, the grouting valve at the pile end was unable to open because it was encased in concrete of a certain strength. This resulted in grouting failure at the pile bottom, directly affecting the pile's bearing capacity. Consequently, structural design changes, additional piles, or the use of core drilling to reset the grouting valve at the pile end were required, leading to increased costs and delays in the construction period.

[0005] Therefore, it is necessary to provide a new pile grouting device and method based on ring rotation control to solve the above-mentioned technical problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a pile grouting device and method based on the ring rotation method that can stably install the grouting valve mechanism in the soil under the pile, ensuring that the subsequent grouting can be carried out smoothly.

[0007] The grouting device for piles controlled by the ring rotation method provided by the present invention includes: a main steel cage, wherein the main steel cage includes longitudinal bars and stirrups;

[0008] The post-grouting mechanism is provided in two sets, and the two sets of post-grouting mechanisms are symmetrically installed in the main steel cage. The post-grouting mechanism includes a ring support, the ring support includes a ring steel plate, one end of the ring steel plate has a notch, a ring handle is welded to one side of the notch, the outer wall of the ring handle is welded to the bottom end of the longitudinal bar of the steel cage, and a sliding block is slidably installed on the ring steel plate, and an L-shaped support bar is installed on the sliding block.

[0009] Grouting pipes are installed on the vertical bars of the L-shaped support bars;

[0010] A grouting valve mechanism is installed at the bottom end of the grouting pipe. The grouting valve mechanism includes a grouting sleeve, which is threaded onto the bottom end of the grouting pipe. A plurality of grouting holes are evenly distributed on the outer side wall of the grouting sleeve. A drill bit is movably installed at the end of the grouting sleeve opposite to the grouting pipe. A valve core assembly is installed at the end of the drill bit that extends into the grouting sleeve. The valve core assembly includes a spring seat, which is mounted on the drill bit. A connecting spring is fixedly installed inside the spring seat. A lower valve core that seals multiple grouting holes is fixedly installed at the end of the connecting spring that is opposite to the spring seat. An upper valve core is inserted into the lower valve core. A threaded sleeve is fixedly installed at the top of the upper valve core. A limit plate is threaded onto the threaded sleeve. A lifting ring is installed at the center of the top of the upper valve core. A plurality of mounting holes are evenly distributed inside the grouting sleeve outside the limit plate. Limiting components that contact and cooperate with the limit plate are installed in each of the mounting holes.

[0011] A traction assembly for pulling the upper valve core is mounted on the top of the grouting pipe.

[0012] Preferably, the drill bit includes a conical head, on which a plurality of insert rods are evenly installed on the outer edge of the top end face of the conical head. The ends of the plurality of insert rods opposite to the conical head are inserted into the insertion holes opened at the bottom end of the grouting sleeve. A protective sleeve is provided on the outer side wall of the top end of the conical head. The inner side wall of the protective sleeve is slidably engaged with the outer side wall of the grouting sleeve. The spring seat is fixedly connected to the top end face of the conical head by screws.

[0013] Preferably, the outer walls of both the lower and upper valve cores slide in fit with the inner wall of the grouting sleeve, and the lower and upper valve cores are inserted into each other by staggered slots.

[0014] Preferably, each of the limiting components includes a sealing rod, which is inserted into a corresponding mounting hole. One end of the sealing rod extending into the grouting sleeve is fitted with a ball head, the top of which contacts and engages with the outer wall of the limiting plate. The other end of the sealing rod is fitted with a plate, and the bottom of the plate is fitted with a sealing cap, which engages with the corresponding top grouting hole.

[0015] Preferably, the plates of several of the limiting members are pre-tightened by tying wire.

[0016] Preferably, the traction assembly includes a frame, which is fixedly installed on the top of the grouting pipe by clamps and has a reel installed on the frame, as well as a servo motor for driving the reel to rotate. A traction steel wire rope is wound on the reel, and one end of the traction steel wire rope extends into the grouting pipe and is fixedly connected to a lifting ring.

[0017] Preferably, a guide wheel is installed at the end of the frame facing the grouting pipe.

[0018] Preferably, a pressure pipe assembly is detachably installed at the top of the main steel cage. The pressure pipe assembly includes an intermediate plate, on which connecting frames are symmetrically inserted. The end of the connecting frame opposite to the intermediate plate is detachably connected to the top of the longitudinal reinforcement of the main steel cage. A lead screw is rotatably installed in the middle of the intermediate plate, and a rotating handle is installed at the bottom of the lead screw. Limiting rods are symmetrically installed on both sides of the lead screw on the intermediate plate. A pressure pipe plate is slidably installed on both limiting rods. A threaded through hole that is threadedly connected to the lead screw is opened in the middle of the pressure pipe plate.

[0019] Preferably, the connector has multiple pin holes evenly distributed at its insertion end, and the two ends of the intermediate plate are threaded with pins that engage with the pin holes.

[0020] This invention provides a pile grouting method based on ring rotation control, comprising the following steps:

[0021] S1. Processing ring support: The ring handle is welded to the ring steel plate to form a ring support. The ring support has a notch, and the L-shaped support rib can pass freely through the notch of the ring support.

[0022] S2. Fixing of the post-grouting mechanism: The ring handle is welded to the inner wall of the longitudinal reinforcement of the bottom of the main steel cage to fix the ring support. The L-shaped support bar is tied and fixed 200mm above the grouting valve mechanism installed at the bottom of the grouting pipe.

[0023] S3. Install the grouting pipe: After installing the grouting valve mechanism and traction assembly on the grouting pipe, place the L-shaped support bar on the ring support so that the sliding block avoids the gap, temporarily fix the grouting pipe on the steel cage, and use iron wire to loosely tie the grouting pipe to the longitudinal reinforcement of the steel cage in sections to prevent the grouting pipe from falling off during hoisting.

[0024] S4. Placement of the main steel cage and grouting pipe: When installing the main steel cage, ensure that the L-shaped support bar rests on the ring support and the ring support supports the L-shaped support bar. As the steel cage is hoisted and placed, the grouting pipe is simultaneously lowered into the borehole, and finally the steel cage is fixed on the top of the pile hole casing.

[0025] S5. Rotate the grouting pipe: After completing step S4, use a pipe wrench to rotate the grouting pipe clockwise from the ground, so that the sliding block at the bottom of the L-shaped support bar falls down from the notch of the ring support. Because the grouting pipe is loosely tied, under its own weight, the grouting pipe drives the grout valve mechanism to insert into the soil and continue to rotate 3-5 times, so that the grout valve mechanism drills into the soil under the action of gravity and rotation.

[0026] S6, Pipe clamping and stabilization: After completing step S5, fix the middle plate to the top of the longitudinal reinforcement of the steel cage through the connecting brackets at both ends, then drive the rotating handle to drive the screw to rotate, drive the pipe clamping plate to move downward, contact and squeeze the grouting pipe to drill into the soil, and perform pipe clamping and stabilization. After clamping and stabilization, remove the pipe clamping assembly.

[0027] S7. Grouting according to design requirements: After completing step S6, first fill the main steel cage with concrete. After the concrete has solidified, use the traction component to pull the upper valve core out of the grouting pipe, and then perform post-grouting according to the design.

[0028] Compared with related technologies, the grouting device and method for pile injection based on the ring rotation method provided by the present invention have the following beneficial effects:

[0029] 1. This invention provides a grouting device and method for pile grouting based on ring rotation control. By symmetrically setting up a post-grouting mechanism inside the main steel cage, the post-grouting mechanism uses a ring steel plate, ring handle, sliding block, L-shaped support bar and notch to cooperate with the grouting pipe, which can accurately bury the bottom end of the grouting pipe into the soil layer placed at the set position, and complete the post-grouting installation of the grouting pipe.

[0030] 2. The grouting pipe, through the grout valve mechanism at the bottom and the migration component at the top, can effectively prevent concrete slurry from being injected into the bottom of the grouting pipe during the grouting of the main steel cage. This allows concrete to be smoothly ejected from the grouting hole in the grouting sleeve during subsequent grouting, thereby injecting cement slurry into the sediment that cannot be cleaned or is not thoroughly cleaned. This reinforces the sediment, mud skin, and soil within a certain range of the cast-in-place pile, improves the bearing capacity of a single pile, ensures that the vertical bearing capacity of each pile is relatively small, reduces settlement, and avoids uneven settlement, structural changes, pile additions, or the use of core drilling to reset the grouting valve at the pile end, which would increase costs and delay the construction period.

[0031] 3. Furthermore, by setting up a pressure pipe assembly, the pressure pipe assembly, through the cooperation of an intermediate plate, pin, connecting frame, screw, rotating handle, limiting rod, pressure pipe plate and pin hole, can further insert the grout valve mechanism into the soil layer, which facilitates the subsequent grouting operation, improves the stability of the overall column pile foundation, and reduces the settlement of the overall pile foundation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a preferred embodiment of the pile grouting device based on the ring rotation method control provided by the present invention.

[0033] Figure 2 This is a schematic diagram of the installation structure of the post-grouting mechanism and grouting pipe provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the post-grouting mechanism provided by the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the slurry valve mechanism provided by the present invention;

[0036] Figure 5 An exploded structural diagram of the slurry valve mechanism provided by the present invention;

[0037] Figure 6 for Figure 4 The diagram shows the structure of the limiting component;

[0038] Figure 7 This is a schematic diagram of the traction assembly provided by the present invention;

[0039] Figure 8 A schematic diagram of the internal structure of the grouting pipe equipped with a grout valve mechanism provided by the present invention;

[0040] Figure 9 This is a schematic diagram of the structure of the pressure tube assembly provided by the present invention;

[0041] Figure 10 This is a block diagram of the pile grouting method based on the ring rotation method provided by the present invention.

[0042] Labels in the diagram: 1. Main reinforcing cage; 11. Longitudinal reinforcement of the reinforcing cage; 12. Stirrups of the reinforcing cage; 2. Post-grouting mechanism; 211. Annular steel plate; 212. Ring handle; 22. Sliding block; 23. L-shaped support bar; 201. Notch; 3. Grouting pipe; 4. Grouting valve mechanism; 41. Grouting sleeve; 42. Drill bit; 421. Conical head; 422. Insert rod; 423. Protective sleeve; 43. Valve core assembly; 431. Spring seat; 432. Connecting spring; 433. Lower valve core; 434. Upper valve core; 435. Threaded sleeve; 436. Limiting plate; 437. Lifting ring; 44. Limiting component; 441. Sealing rod; 442. Plate; 443. Ball head; 444. Sealing cover; 45. Binding wire; 401. Grouting hole; 402. Mounting hole; 5. Traction assembly; 51. Frame; 52. Reel; 53. Servo motor; 54. Traction wire rope; 55. Guide wheel; 6. Pipe pressing assembly; 61. Intermediate plate; 611. Pin rod; 62. Connecting frame; 63. Lead screw; 64. Rotating handle; 65. Limiting rod; 66. Pipe pressing plate; 601. Pin hole. Detailed Implementation

[0043] Example 1:

[0044] Please see Figures 1 to 8 The present invention provides a pile grouting device based on the ring rotation method control, which includes:

[0045] The main steel cage 1 includes longitudinal steel bars 11 and stirrups 12.

[0046] The post-grouting mechanism 2 is provided in two sets, and the two sets of post-grouting mechanisms 2 are symmetrically installed in the main steel cage 1. The post-grouting mechanism 2 includes a ring support, which includes a ring steel plate 211. One end of the ring steel plate 211 has a notch 201. A ring handle 212 is welded to one side of the notch 201. The outer wall of the ring handle 212 is welded to the bottom end of the longitudinal reinforcement 11 of the steel cage. A sliding block 22 is slidably installed on the ring steel plate 211, and an L-shaped support bar 23 is installed on the sliding block 22.

[0047] Grouting pipe 3 is installed on the vertical bar of L-shaped support bar 23;

[0048] The grouting valve mechanism 4 is installed at the bottom end of the grouting pipe 3. The grouting valve mechanism 4 includes a grouting sleeve 41, which is threaded onto the bottom end of the grouting pipe 3. The outer wall of the grouting sleeve 41 is evenly provided with a plurality of grouting holes 401. A drill bit 42 is movably installed at the end of the grouting sleeve 41 away from the grouting pipe 3. A valve core assembly 43 is installed at the end of the drill bit 42 that extends into the grouting sleeve 41. The valve core assembly 43 includes a spring seat 431, which is installed on the drill bit 42. A connecting spring 432 is fixedly installed inside the spring seat 431. A lower valve core 433 that seals the plurality of grouting holes 401 is fixedly installed at the end of the connecting spring 432 away from the spring seat 431. An upper valve core 434 is inserted into the lower valve core 433. A threaded sleeve is fixedly installed at the top end of the upper valve core 434. 435, a limiting disc 436 is threadedly installed on the threaded sleeve 435, a lifting ring 437 is installed at the top center of the upper valve core 434, a number of mounting holes 402 are evenly opened in the grouting sleeve 41 on the outside of the limiting disc 436, a limiting element 44 that contacts and cooperates with the limiting disc 436 is installed in each of the mounting holes 402, and a sealing rod 441 is included in each of the limiting elements 44. The sealing rod 441 is inserted into the corresponding mounting hole 402, and a ball head 443 is installed at one end of the sealing rod 441 that extends into the grouting sleeve 41. The top of the ball head 443 contacts and cooperates with the outer wall of the limiting disc 436. A plate 442 is installed at the other end of the sealing rod 441. A sealing cover 444 is installed at the bottom end of the plate 442. The sealing cover 444 is inserted and cooperates with the corresponding top grouting hole 401.

[0049] The traction assembly 5, used for pulling the upper valve core 434, is installed at the top of the grouting pipe 3.

[0050] The drill bit 42 includes a conical head 421. Multiple insertion rods 422 are evenly installed on the outer edge of the top end face of the conical head 421. The ends of the insertion rods 422 facing away from the conical head 421 are inserted into insertion holes at the bottom end of the grouting sleeve 41. A protective sleeve 423 is provided on the outer wall of the top end of the conical head 421. The inner wall of the protective sleeve 423 slides against the outer wall of the grouting sleeve 41. A spring seat 431 is fixedly connected to the top end face of the conical head 421 by screws. The outer walls of the lower valve core 433 and the upper valve core 434 slide against the inner wall of the grouting sleeve 41. The lower valve core 433 and the upper valve core 434 are integrated by interlocking slots.

[0051] It should be noted that during use, the ring support is fixed to the bottom end of the longitudinal reinforcement 11 of the reinforcing cage using the ring handle 212. Then, the grouting valve mechanism 4 and the traction assembly 5 are installed at the bottom and top of the grouting pipe 3. After fixing the grouting pipe 3 to the L-shaped support rib 23, the L-shaped support rib 23 is placed on the annular steel plate 211 using the sliding block 22 at the bottom. Then, the main reinforcing cage 1 and the grouting pipe 3 are placed, ensuring that the L-shaped support rib 23 rests on the ring support. The ring support holds the L-shaped support rib 23. As the steel cage is hoisted and placed, the grouting pipe 3 is simultaneously lowered into the borehole. Finally, the steel cage is fixed on top of the pile hole casing. Then, the grouting pipe 3 is rotated clockwise with pipe wrenches on the ground, causing the sliding block 22 at the bottom of the L-shaped support bar 23 to fall from the notch 201 of the ring support. Because the grouting pipe 3 is loosely tied, under its own weight, the grouting pipe 3 drives the grout valve mechanism 4 to insert into the soil sediment and continue to rotate 3-5 times, so that the grout valve mechanism 4 drills into the soil sediment under the action of gravity and rotation.

[0052] When the grouting valve mechanism 4 is in use, during drilling into the soil, the conical head 421 of the bottom drill bit 42 drills down into the soil layer to facilitate better penetration. During drilling pressure, the conical head 421 is pressed against the bottom of the grouting sleeve 41. A protective sleeve 423 then protects the connection point. During grouting, concrete grout is poured into the grouting sleeve 41. When grouting the main steel cage 1, after the grouting sleeve 41 is inserted into the soil layer, the upper valve core 434, under the constraint of the limiting plate 436 and the limiting element 44, engages with the lower valve core 433. Supported by the connecting spring 432, the lower valve core 433, in conjunction with the upper valve core 434, seals the grouting hole 401, preventing grout from entering the grouting sleeve 41 from the grouting hole 401 during grouting, thus avoiding any impact on subsequent grouting. In the grouting operation, after the grout in the main steel cage 1 has solidified, the traction assembly 5 is activated to remove the upper valve core 434 from the grouting pipe 3, thereby opening the lower valve core 433. Then, during the subsequent grouting, when the grout fills the grouting sleeve 41, the lower valve core 433, together with the drill bit 42, is further pressed into the soil layer, thereby fully opening the grouting hole 401. This facilitates subsequent grouting through the grouting hole 401, injecting cement grout into the sediment that cannot be cleaned or is not thoroughly cleaned, to reinforce the sediment, mud skin, and a certain range of soil in the cast-in-place pile, improve the bearing capacity of a single pile, ensure that the vertical bearing capacity of each pile is relatively small, and reduce settlement. This can avoid uneven settlement, or the increased costs and delays caused by design changes, pile additions, or core drilling to reset the grouting valve at the pile end, thus improving the overall construction quality and efficiency of the subsequent grouting.

[0053] In this embodiment, the plates 442 of several limiting members 44 are pre-tightened by binding wires 45. This facilitates the restriction of the limiting members 44 and ensures that the limiting members 44 will not detach from the mounting holes 402. When the limiting member 44 is in the limiting position, the binding wires 45 fix it to the grouting sleeve 41, and the ball head 443 at the front end of its sealing rod 441 presses against the upper limit plate 436, restricting the upper valve core 434, thereby allowing it to be inserted into the lower valve core 433, completing the process. The section of the grouting sleeve 41 with the grouting hole 401 is sealed, and the grouting hole 401 at the top is further sealed from the outside by the sealing cover 444. Then, during the subsequent grouting, when the traction component 5 forcibly pulls the upper valve core 434 upward, the limiting disc 436 contacts and squeezes the ball head 443 through the arc shape opened on the outer edge, forcibly squeezing the sealing rod 441 into the mounting hole 402, and then opening the grouting hole 401 at the top and the lower valve core 433 to facilitate the subsequent grouting.

[0054] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 The traction assembly 5 includes a frame 51, which is fixedly installed on the top of the grouting pipe 3 by a clamp and a reel 52 is installed on the frame 51, as well as a servo motor 53 that drives the reel 52 to rotate. A traction steel wire rope 54 is wound on the reel 52, and one end of the traction steel wire rope 54 extends into the grouting pipe 3 and is fixedly connected to the lifting ring 437.

[0055] It should be noted that when using the traction component 5, first start the servo motor 53 to drive the reel 52 to unwind, tie one end of the traction wire rope 54 to the lifting ring 437, and then start the servo motor 53 to drive the reel 52 to wind up the traction wire rope 54, thereby forcibly pulling the upper valve core 434 out of the lower valve core 433 until it is pulled out of the grouting pipe 3, and remove the traction component 5 connected to the upper valve core 434 as a whole, open the grouting hole 401, and then the post-grouting operation can be carried out through the grouting pipe 3.

[0056] In this embodiment, a guide wheel 55 is installed at one end of the frame 51 facing the grouting pipe 3 to guide the unwinding of the traction wire rope 54 and facilitate its better unwinding in the grouting pipe 3.

[0057] Example 2:

[0058] This second embodiment is based on the first embodiment; please refer to... Figure 1 and Figure 9The top of the main steel cage 1 is detachably equipped with a pressing pipe assembly 6. The pressing pipe assembly 6 includes an intermediate plate 61. A connecting frame 62 is symmetrically inserted on the intermediate plate 61. The end of the connecting frame 62 facing away from the intermediate plate 61 is detachably connected to the top of the longitudinal reinforcement 11 of the main steel cage 1. A screw rod 63 is rotatably installed in the middle of the intermediate plate 61. A rotating handle 64 is installed at the bottom of the screw rod 63. Limiting rods 65 are symmetrically installed on both sides of the intermediate plate 61 on the screw rod 63. A pressing pipe plate 66 is slidably installed on the two limiting rods 65. A threaded through hole that is threadedly connected to the screw rod 63 is opened in the middle of the pressing pipe plate 66.

[0059] It should be noted that: under the action of gravity and rotation, the grout valve mechanism 4 drills into the soil sediment, and then the intermediate plate 61 is fixed to the top of the longitudinal reinforcement 11 of the steel cage through the connecting brackets 62 at both ends. Then, the rotating handle 64 drives the screw 63 to rotate, and drives the pressure plate 66 to move downward, contact and squeeze the grouting pipe 3 to further drill into the soil, and perform pipe pressing and stabilization. After pressing and stabilization, the pressure pipe assembly 6 is removed, and grouting can be performed on the main steel cage 1.

[0060] In this embodiment, the connector 62 has a plurality of pin holes 601 evenly provided at the insertion end, and the two ends of the intermediate plate 61 are threaded with pins 611 that cooperate with the pins in the pin holes 601. This makes it easy to pull the connector 62 at both ends to detachably connect it with the main steel cage 1 of different diameter specifications.

[0061] A pile grouting method based on ring rotation control, please refer to [link / reference]. Figures 1 to 10 It includes the following steps:

[0062] S1. Processing ring support: The ring handle 212 is welded to the annular steel plate 211 to form a ring support. The ring support has a notch 201, and the L-shaped support rib 23 can pass freely through the notch 201 of the ring support.

[0063] S2. Fixing of the post-grouting mechanism 2: The ring handle 212 is welded to the inner wall of the longitudinal reinforcement 11 at the bottom of the main steel cage 1, and the ring support is fixed. The L-shaped support rib 23 is tied and fixed at the grouting pipe 3 200mm above the grouting valve mechanism 4 installed at its bottom end.

[0064] S3. Install grouting pipe 3: After installing the grouting valve mechanism 4 and the traction component 5 on the grouting pipe 3, place the L-shaped support bar 23 on the ring support so that the sliding block 22 avoids the notch 201, temporarily fix the grouting pipe 3 on the steel cage, and use iron wire to loosely tie the grouting pipe 3 to the longitudinal bar 11 of the steel cage in sections to prevent the grouting pipe 3 from falling off during hoisting.

[0065] S4. Place the main steel cage 1 and grouting pipe 3: When installing the main steel cage 1, ensure that the L-shaped support bar 23 rests on the ring support and the ring support supports the L-shaped support bar 23. As the steel cage is hoisted and placed, the grouting pipe 3 is simultaneously lowered into the borehole, and finally the steel cage is fixed on the top of the pile hole casing.

[0066] S5. Rotate grouting pipe 3: After completing step S4, use a pipe wrench to rotate grouting pipe 3 clockwise from the ground, so that the sliding block 22 at the bottom of the L-shaped support bar 23 falls down from the ring support notch 201. Because grouting pipe 3 is loosely tied, under its own weight, grouting pipe 3 drives grout valve mechanism 4 to insert into the soil sediment, and continues to rotate 3-5 times, so that grout valve mechanism 4 drills into the soil sediment under the action of gravity and rotation.

[0067] S6, Pipe clamping and stabilization: After completing step S5, fix the intermediate plate 61 to the top of the longitudinal reinforcement 11 of the steel cage through the connecting brackets 62 at both ends, then drive the rotating handle 64 to drive the screw 63 to rotate, drive the pipe clamping plate 66 to move downward, contact and squeeze the grouting pipe 3 to drill into the soil, and perform pipe clamping and stabilization. After clamping and stabilization, remove the pipe clamping assembly 6.

[0068] S7. Grouting according to design requirements: After completing step S6, first fill the main steel cage 1 with concrete. After the concrete has solidified, use the traction component 5 to pull the upper valve core 434 out of the grouting pipe 3, and then perform post-grouting according to the design.

[0069] The working principle of the pile grouting device and method based on ring rotation control provided by this invention is as follows:

[0070] In use, the ring support is fixed to the bottom end of the longitudinal reinforcement 11 of the reinforcing cage using the ring handle 212. Then, the grouting valve mechanism 4 and the traction assembly 5 are installed at the bottom and top of the grouting pipe 3. After fixing the grouting pipe 3 to the L-shaped support rib 23, the L-shaped support rib 23 is placed on the annular steel plate 211 using the sliding block 22 at the bottom. Then, the main reinforcing cage 1 and the grouting pipe 3 are placed, ensuring that the L-shaped support rib 23 rests on the ring support and that the ring support holds the L-shaped support rib 23 in place. As the reinforcing cage is hoisted and placed, the grouting pipe 3 is simultaneously lowered into the borehole. Finally, the reinforcing cage is fixed on top of the pile hole casing. Then, the grouting pipe 3 is rotated clockwise with pipe wrenches on the ground, causing the sliding block 22 at the bottom of the L-shaped support bar 23 to fall down from the notch 201 of the ring support. Because the grouting pipe 3 is loosely tied, under its own weight, the grouting pipe 3 drives the grout valve mechanism 4 to insert into the soil sediment and continue to rotate 3-5 times, so that the grout valve mechanism 4 drills into the soil sediment under the action of gravity and rotation.

[0071] When the grouting valve mechanism 4 is in use, during drilling into the soil, the conical head 421 of the bottom drill bit 42 drills down into the soil layer to facilitate better penetration. During drilling pressure, the conical head 421 is pressed against the bottom of the grouting sleeve 41. A protective sleeve 423 then protects the connection point. During grouting, concrete grout is poured into the grouting sleeve 41. When grouting the main steel cage 1, after the grouting sleeve 41 is inserted into the soil layer, the upper valve core 434, under the constraint of the limiting plate 436 and the limiting element 44, engages with the lower valve core 433. Supported by the connecting spring 432, the lower valve core 433, in conjunction with the upper valve core 434, seals the grouting hole 401, preventing grout from entering the grouting sleeve 41 from the grouting hole 401 during grouting, thus avoiding any impact on subsequent grouting. In the grouting operation, after the grout in the main steel cage 1 has solidified, the traction assembly 5 is activated to remove the upper valve core 434 from the grouting pipe 3, thereby opening the lower valve core 433. Then, during the subsequent grouting, when the grout fills the grouting sleeve 41, the lower valve core 433, together with the drill bit 42, is further pressed into the soil layer, thereby fully opening the grouting hole 401. This facilitates subsequent grouting through the grouting hole 401, injecting cement grout into the sediment that cannot be cleaned or is not thoroughly cleaned, to reinforce the sediment, mud skin, and soil within a certain range of the cast-in-place pile, improve the bearing capacity of a single pile, ensure that the vertical bearing capacity of each pile is relatively small, and reduce settlement. This can avoid uneven settlement, or the increased costs and delays caused by design changes, pile additions, or core drilling to reset the grouting valve at the pile end, thus improving the overall construction quality and efficiency of the subsequent grouting.

[0072] Furthermore, under the action of gravity and rotation, the grout valve mechanism 4 drills into the soil sediment. Then, the intermediate plate 61 is fixed to the top of the longitudinal reinforcement 11 of the steel cage through the connecting brackets 62 at both ends. Then, the rotating handle 64 drives the screw 63 to rotate, driving the pressure plate 66 to move downward, contacting and squeezing the grouting pipe 3 to further drill into the soil for pressure and stabilization. After pressure and stabilization, the pressure pipe assembly 6 is removed, and grouting can be performed on the main steel cage 1.

[0073] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0074] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pile grouting device based on ring rotation control, comprising: The main steel cage (1) includes longitudinal steel bars (11) and stirrups (12). Its characteristic is that it further includes: The post-grouting mechanism (2) is provided in two sets, and the two sets of post-grouting mechanisms (2) are symmetrically installed in the main steel cage (1). The post-grouting mechanism (2) includes a ring support, which includes an annular steel plate (211). One end of the annular steel plate (211) is provided with a notch (201). A ring handle (212) is welded to one side of the notch (201). The outer wall of the ring handle (212) is welded to the bottom end of the longitudinal reinforcement (11) of the steel cage. A sliding block (22) is slidably installed on the annular steel plate (211). An L-shaped support bar (23) is installed on the sliding block (22). Grouting pipe (3) is installed on the vertical bar of the L-shaped support bar (23); A grout valve mechanism (4) is installed at the bottom end of the grouting pipe (3), and the grout valve mechanism (4) includes a grouting sleeve (41). The grouting sleeve (41) is threadedly installed at the bottom end of the grouting pipe (3), and a plurality of grouting holes (401) are evenly opened on the outer side wall of the grouting sleeve (41). A drill bit (42) is movably installed at the end of the grouting sleeve (41) away from the grouting pipe (3). A valve core assembly (43) is installed at the end of the drill bit (42) that extends into the grouting sleeve (41). The valve core assembly (43) includes a spring seat (431). The spring seat (431) is installed on the drill bit (42), and a connecting spring (43) is fixedly installed inside the spring seat (431). 2) The lower valve core (433) that seals multiple grouting holes (401) is fixedly installed at the end of the connecting spring (432) away from the spring seat (431). An upper valve core (434) is inserted into the lower valve core (433). A threaded sleeve (435) is fixedly installed at the top of the upper valve core (434). A limit plate (436) is threaded on the threaded sleeve (435). A lifting ring (437) is installed at the middle of the top of the upper valve core (434). Several mounting holes (402) are evenly opened inside the grouting sleeve (41) on the outside of the limit plate (436). A limit member (44) that contacts and cooperates with the limit plate (436) is installed in each of the mounting holes (402). The traction assembly (5), used for pulling the upper valve core (434), is installed at the top of the grouting pipe (3).

2. The pile grouting device based on ring rotation control according to claim 1, characterized in that, The drill bit (42) includes a conical head (421). Multiple insertion rods (422) are evenly installed on the outer edge of the top end face of the conical head (421). The ends of the multiple insertion rods (422) opposite to the conical head (421) are inserted into the insertion holes opened at the bottom end of the grouting sleeve (41). A protective sleeve (423) is provided on the outer side wall of the top end of the conical head (421). The inner side wall of the protective sleeve (423) is slidably engaged with the outer side wall of the grouting sleeve (41). The spring seat (431) is fixedly connected to the top end face of the conical head (421) by screws.

3. The pile grouting device based on ring rotation control according to claim 1, characterized in that, The outer walls of the lower valve core (433) and the upper valve core (434) are slidably fitted with the inner wall of the grouting sleeve (41), and the lower valve core (433) and the upper valve core (434) are inserted into each other by staggered slots.

4. The pile grouting device based on ring rotation control according to claim 1, characterized in that, Each of the aforementioned limiting components (44) includes a sealing rod (441), which is inserted into a corresponding mounting hole (402). A ball head (443) is installed at one end of the sealing rod (441) that extends into the grouting sleeve (41). The top end of the ball head (443) contacts and engages with the outer wall of the limiting plate (436). A plate (442) is installed at the other end of the sealing rod (441). A sealing cover (444) is installed at the bottom end of the plate (442). The sealing cover (444) is inserted into and engages with the corresponding top grouting hole (401).

5. The pile grouting device based on ring rotation control according to claim 4, characterized in that, The plates (442) of several of the limiting members (44) are pre-tightened by tie wire (45).

6. The pile grouting device based on ring rotation control according to claim 1, characterized in that, The traction assembly (5) includes a frame (51), which is fixedly installed on the top of the grouting pipe (3) by a clamp and a reel (52) is installed on the frame (51), and a servo motor (53) for driving the reel (52) to rotate. A traction wire rope (54) is wound on the reel (52), and one end of the traction wire rope (54) extends into the grouting pipe (3) and is fixedly connected to the lifting ring (437).

7. The pile grouting device based on ring rotation control according to claim 6, characterized in that, The frame (51) is equipped with a guide wheel (55) at one end facing the grouting pipe (3).

8. The pile grouting device based on ring rotation control according to claim 1, characterized in that, The top of the main steel cage (1) is detachably equipped with a pressure pipe assembly (6). The pressure pipe assembly (6) includes an intermediate plate (61). A connecting frame (62) is symmetrically inserted on the intermediate plate (61). The end of the connecting frame (62) away from the intermediate plate (61) is detachably connected to the top of the longitudinal reinforcement (11) of the main steel cage (1). A screw rod (63) is rotatably installed in the middle of the intermediate plate (61). A rotating handle (64) is installed at the bottom of the screw rod (63). Limiting rods (65) are symmetrically installed on both sides of the intermediate plate (61) on the screw rod (63). A pressure pipe plate (66) is slidably installed on both limiting rods (65). A threaded through hole that is threadedly connected to the screw rod (63) is opened in the middle of the pressure pipe plate (66).

9. The pile grouting device based on ring rotation control according to claim 8, characterized in that, The connector (62) has a plurality of pin holes (601) evenly distributed at the insertion end, and the two ends of the intermediate plate (61) are threaded with pins (611) that cooperate with the pin holes (601).

10. A pile grouting method based on ring rotation control, using the pile grouting device based on ring rotation control according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Processing ring support: The ring handle (212) and the ring steel plate (211) are welded to form a ring support. The ring support has a notch (201), and the L-shaped support rib (23) can pass freely through the notch (201) of the ring support. S2, Fixing of the post-grouting mechanism (2): The ring handle (212) is welded to the inner wall of the longitudinal reinforcement (11) of the bottom of the main steel cage (1), and the ring support is fixed. The L-shaped support bar (23) is tied and fixed at 200mm above the grouting pipe (3) and the grout valve mechanism (4) installed at its bottom end. S3. Install the grouting pipe (3): After installing the grouting valve mechanism (4) and the traction assembly (5) on the grouting pipe (3), place the L-shaped support bar (23) on the ring support so that the sliding block (22) avoids the notch (201), temporarily fix the grouting pipe (3) on the steel cage, and use iron wire to loosely tie the grouting pipe (3) to the longitudinal bar (11) of the steel cage in sections to prevent the grouting pipe (3) from falling off during hoisting; S4. Place the main steel cage (1) and grouting pipe (3): When installing the main steel cage (1), ensure that the L-shaped support bar (23) rests on the ring support. The ring support supports the L-shaped support bar (23). As the steel cage is hoisted and placed, the grouting pipe (3) is simultaneously lowered into the borehole. Finally, the steel cage is fixed on the top of the pile hole casing. S5. Rotate the grouting pipe (3): After completing step S4, use a pipe wrench to rotate the grouting pipe (3) clockwise from the ground, so that the sliding block (22) at the bottom of the L-shaped support bar (23) falls down from the ring support notch (201). Since the grouting pipe (3) is loosely tied, under its own weight, the grouting pipe (3) drives the grout valve mechanism (4) to insert into the soil and continue to rotate 3-5 times, so that the grout valve mechanism (4) drills into the soil under the action of gravity and rotation. S6, Pipe clamping and stabilization: After completing step S5, fix the intermediate plate (61) to the top of the longitudinal reinforcement (11) of the steel cage through the connecting brackets (62) at both ends, then drive the rotating handle (64) to drive the screw (63) to rotate, drive the pipe clamping plate (66) to move downward, contact and squeeze the grouting pipe (3) to drill into the soil, perform pipe clamping and stabilization, and remove the pipe clamping assembly (6) after clamping. S7. Grouting according to design requirements: After completing step S6, first fill the main steel cage (1) with concrete. After the concrete has solidified, use the traction component (5) to pull the upper valve core (434) out of the grouting pipe (3) and then perform post-grouting according to the design.

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