Flow self-adaptive pile side grouting device and construction method

Abstract

The invention relates to the technical field of pile foundation engineering, in particular to a flow self-adaptive pile side mud jacking device and a construction method.The flow self-adaptive pile side mud jacking device comprises one or more pile side annular mud jacking pipes, vertical mud jacking pipes, a flow self-adaptive valve body and a mud outlet nozzle, the pile side annular mud jacking pipes are of an annular opening structure, and the vertical mud jacking pipes are connected with the flow self-adaptive valve body; the middle parts of the pile side annular mud jacking pipes are communicated with the vertical mud jacking pipes through three-way connectors, and one or more pile side annular mud jacking pipes are mounted on the outer side of a cast-in-place pile reinforcement cage through the vertical mud jacking pipes; the flow self-adaption valve bodies are arranged at the two ends of the pile side annular mud jacking pipe, the multiple flow self-adaption valve bodies are further arranged between the flow self-adaption valve bodies at the two ends of the pile side annular mud jacking pipe, and the outer side ends of the flow self-adaption valve bodies are connected with the mud outlet nozzles. The flow self-adaptive pile side grouting device is low-carbon and environment-friendly, and the design length of a cast-in-place pile can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation engineering, and in particular to a flow-adaptive pile side grouting device and a construction method. Background Art

[0002] At present, bored piles have been widely used in the fields of construction engineering, bridge engineering, and traffic engineering due to their advantages of high pile body strength, reliable quality, and fast construction speed. However, bored piles generally have problems with pile side mud skin, pile end sediment and bearing layer disturbance, and pile body concrete quality problems, which lead to the vertical bearing capacity of bored piles being relatively discrete, resulting in a reduction in bearing capacity after pile formation. In view of this, the proposed traditional pile side post-grouting is to reinforce the pile side mud skin by post-grouting with a pre-buried grouting valve, which plays a role in improving the bearing capacity. However, in actual use, because a pile side grouting device is often equipped with multiple grouting valves at the same time, when the pile side concrete thickness and hole expansion are uneven, it is often impossible to achieve uniform grouting, which makes the construction effect of grouting construction somewhat compromised. In order to reduce the mud skin problem of traditional bored piles during the pile formation process, it is necessary to solve the problem of application limitations of pile side post-grouting under specific conditions, improve the quality of pile side grouting, and achieve the purpose of saving pile length and reducing construction cost.

[0003] Prior to the present invention, a Chinese utility model (patent application number: 201621422036.X) disclosed a "post-grouting pipe pile", which is characterized in that the pile end of the pipe pile body is provided with an end plate, and a T-shaped groove and a plurality of evenly distributed end plate holes are sequentially arranged circumferentially from the end plate axis to the outside, and the ear of the T-shaped groove forms a sealing groove for filling a rubber sealing strip, and the pile tip is conical, and the grouting pipe includes a pile end grouting pipe and a pile side grouting pipe; (2) the grouting pipe includes two symmetrical pile end grouting pipes and two symmetrical pile side grouting pipes, and the four grouting pipes are arranged in a cross shape. However, it has the following disadvantages: (1) The post-grouting pipe pile needs to be customized for the project, and it is difficult for factory production to meet the project requirements due to the tight construction period; (2) There are high precision requirements for the pipe pile mold, and the construction difficulty of the pipe pile joint is increased.

[0004] A Chinese patent (patent application number: 201710470201.1) discloses "a pipe pile with post-grouting grouting pipe and its construction method", which is characterized by: opening a grouting hole between steel piles, symmetrically arranging grouting pipes inside the pipe pile body with its axis as the center, and spot welding a sealing plate corresponding to the grouting hole to cover the grouting hole and be pushed open by the grouting pressure. However, this method has the following defects: (1) The grouting hole is vertically opened in the pipe pile end plate. During the pipe pile construction process, due to the huge vertical pressure, it is difficult to open the grouting sealing plate in the later grouting; (2) One grouting hole corresponds to one grouting pipe, and the number of grouting pipes is large, which is not economical. (3) The grouting pipe is arranged inside the pipe pile, which increases the difficulty of pipe pile production, and different types of pipe piles need to adjust the production mold separately.

[0005] Therefore, there is an urgent need for a post-grouting device and construction method that can fully utilize and improve the quality of pile side post-grouting construction, ensure the uniform distribution of pile side post-grouting slurry, and have cost and construction period advantages under the condition of simple construction and installation. The present invention came into being under such conditions and became a means to solve this problem. Summary of the invention

[0006] The purpose of the present invention is to provide a flow-adaptive pile side grouting device and a construction method. On the basis of the traditional cast-in-place pile side post-grouting, a flow-adaptive grouting device is installed on the pile side grouting pipe to achieve the injection of high-pressure cement slurry after the cast-in-place pile construction is completed, and the pile side grouting can be discharged and evenly distributed through multiple grouting valves, thereby improving the stress performance of the cast-in-place pile side, being low-carbon and environmentally friendly, and being able to greatly reduce the design length of the cast-in-place pile, so as to solve the technical problems existing in the above-mentioned background technology.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A flow adaptive pile side grouting device comprises: a pile side annular grouting pipe, a vertical grouting pipe, a flow adaptive valve body and a grouting nozzle, wherein the pile side annular grouting pipe is an annular opening structure, and one or more pile side annular grouting pipes are arranged, the middle part of the pile side annular grouting pipe is connected to the vertical grouting pipe through a three-way connector, and one or more pile side annular grouting pipes are installed on the outside of the cast-in-place pile reinforcement cage through the vertical grouting pipe; both ends of the pile side annular grouting pipe are provided with flow adaptive valve bodies, and the pile side annular grouting pipe is also provided with multiple flow adaptive valve bodies between the flow adaptive valve bodies at both ends, and the outer end of the flow adaptive valve body is connected to the slurry outlet.

[0009] Furthermore, the three-way connector includes: a first T-shaped tee, a switching straight pipe and a first right-angle double-way, the two lateral ways of the first T-shaped tee are respectively sealed and sleeved on the left and right sides of the middle part of the pile-side annular grouting pipe, and a grouting inlet is provided on the radial inner side of the pile-side annular grouting pipe, which is connected to the longitudinal way of the first T-shaped tee, the longitudinal way of the first T-shaped tee is connected to one end of the first right-angle double-way through the switching straight pipe, and the other end of the first right-angle double-way is connected to the vertical grouting pipe.

[0010] Furthermore, it also includes: a second T-shaped tee and a second right-angle two-way, the two ends of the pile-side annular grouting pipe are connected to two flow adaptive valve bodies through two second right-angle two-way respectively, and the pile-side annular grouting pipe is connected to multiple flow adaptive valve bodies through multiple second T-shaped tees between the two second right-angle two-way.

[0011] Furthermore, a plurality of grouting outlets are provided in the annular grouting pipe on the pile side between the two second right-angle double-way passages, the two transverse passages of the second T-shaped tee are respectively sealed and sleeved on both sides of the corresponding grouting outlets, and the longitudinal passage of the second T-shaped tee is connected to the flow adaptive valve body; one end of the second right-angle double-way passage is connected to the end of the annular grouting pipe on the pile side, and the other end of the second right-angle double-way passage is connected to the flow adaptive valve body.

[0012] Furthermore, the flow adaptive valve body includes: a valve body main body A, a slurry outlet head A, a spring A and a ball A. The left side opening of the valve body main body A is hollow inside, and a valve hole A is opened in the middle of the right end of the valve body main body A. The left end of the slurry outlet head A is sealed and welded at the right end edge of the valve body main body A. The left side opening of the slurry outlet head A is hollow inside, and a plurality of slurry outlet holes A are evenly opened at the right end of the slurry outlet head A. The right end of the spring A is fixedly connected to the middle of the slurry outlet head A. The spring A movably passes through the valve hole A and is fixedly connected to the ball A in the inner cavity of the valve body main body A. The diameter of the ball A is larger than the diameter of the valve hole A. The left end of the valve body main body A is threaded and sealed to the other end of the longitudinal single-way of the second T-shaped tee or the second right-angle double-way.

[0013] Furthermore, the flow adaptive valve body includes: a valve body B, a slurry outlet B, a spring B, a sphere B and a partition B. The left side opening of the valve body B is hollow inside, and a valve hole B is opened in the middle of the right end of the valve body B. The left end of the slurry outlet B is sealed and welded at the edge of the right end of the valve body B. The left side opening of the slurry outlet B is hollow inside, and a plurality of slurry outlet holes B are evenly opened at the right end of the slurry outlet B. The right end of the spring B is fixedly connected to the middle of the slurry outlet B. The spring B movably penetrates the valve hole B and is fixedly connected to the sphere B in the inner cavity of the valve body B. The diameter of the sphere B is larger than the diameter of the valve hole B. The inner cavity of the valve body B is located on the left side of the sphere B and is threadedly connected with a partition B. An injection hole B is opened in the middle of the partition B. The diameter of the injection hole B is smaller than the diameter of the sphere B. The left end of the valve body B is threaded and sealed to the other end of the longitudinal single-way of the second T-shaped tee or the second right-angle double-way.

[0014] Furthermore, the flow adaptive valve body includes: a valve body C, a partition C, a spring C and a ball C. The left side opening of the valve body C is hollow inside, and a valve hole C is opened in the middle of the right end of the valve body C. The left side of the inner cavity of the valve body C is threadedly sealed and connected to the partition C. A number of injection holes C are evenly opened on the partition C. The left end of the spring C is fixedly connected to the middle of the partition C, and the right end of the spring C is fixedly connected to the ball C. The diameter of the ball C is larger than the diameter of the valve hole C. The left end of the valve body C is threadedly sealed and connected to the other end of the longitudinal single-way of the second T-shaped three-way or the second right-angle two-way.

[0015] A flow-adaptive pile side grouting construction method, using a flow-adaptive pile side grouting device, specifically comprises the following steps:

[0016] Step 1: Connect the flow-adaptive pile side grouting device to the cast-in-place pile reinforcement cage, wherein the pile side annular grouting pipe is arranged outside the reinforcement cage, fixed to the reinforcement cage by steel wire, and connected to the vertical grouting pipe by a three-way connector, and the vertical grouting pipe is connected and arranged inside the reinforcement cage and is equal in length to the reinforcement cage;

[0017] Step 2: Put the first section of the steel cage into the pile hole. Before installing the next section of the steel cage, fix the vertical grouting steel pipe in the next section of the steel cage in advance. When the steel cage is extended, the vertical grouting steel pipe is connected at the same time.

[0018] Step 3: construct the remaining steel cages in sequence, connect the vertical grouting pipes, until the cast-in-place pile construction is completed, and the vertical grouting pipes are led out of the ground through the steel cages;

[0019] Step 4: Connect the vertical grouting pipe leading out of the ground through the post-grouting equipment, press the cement slurry into the flow-adaptive pile side grouting device through the grouting machine with flow control function, and achieve uniform grouting by controlling the grouting flow.

[0020] Furthermore, the step four is specifically as follows: control the grouting flow rate to gradually increase from zero, and observe the flow rate change in this process; when the flow rate is less than or equal to the total flow rate limiting the adaptive pile side grouting device, all flow adaptive valve bodies on the pile side are ready to open, and the slurry discharge from the grouting holes on the pile side is adaptively adjusted according to the situation outside the hole; if one or more flow adaptive valve bodies on the pile side are blocked, the corresponding grouting flow rate will be transmitted to the remaining grouting holes, so that the total flow rate of the remaining flow adaptive valve bodies is greater than the flow limiting flow rate, and the remaining flow adaptive valve bodies are forced to close, and more pressure is transmitted to the blocked flow adaptive valve body. When the pressure reaches a certain amount, the pile side flow adaptive valve body opens to rebalance the flow; when the flow rate is greater than the total flow limiting flow of the adaptive pile side grouting device, all flow adaptive valve bodies are automatically closed due to the action of the flow limiter, and the grouting pressure continues to increase, thereby realizing the pressure maintaining function after grouting. At this time, the grouting pump flow rate is maintained at not less than minutes, and then the grouting pump is turned off to complete the grouting.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] On the basis of the traditional post-grouting of the bored pile side, an adaptive grouting device is installed on the grouting pipe on the pile side to realize the injection of high-pressure cement slurry after the bored pile construction is completed. The grouting on the pile side can be discharged through multiple grouting valves and evenly distributed, thereby improving the stress performance of the bored pile side, being low-carbon and environmentally friendly, and can significantly reduce the design length of the bored pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 is a schematic structural diagram of a flow adaptive valve body in Embodiment 1 of the present invention;

[0025] Figure 3 is a schematic structural diagram of a flow adaptive valve body in Embodiment 2 of the present invention;

[0026] Figure 4 is a schematic structural diagram of a flow adaptive valve body in Embodiment 3 of the present invention;

[0027] Figure 5 It is a schematic diagram of the installation of a flow-adaptive pile side grouting device provided by the present invention.

[0028] The numbers in the accompanying drawings are: 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 801a-valve body A, 802a-slurry outlet head A, 803a-spring A, 804a-ball A, 801b-valve body B, 802b-slurry outlet head B, 803b-spring B, 804b-ball B, 805b-partition B, 801c-valve body C, 802c-partition C, 803c-spring C, 804c-ball C, 9-slurry outlet nozzle. DETAILED DESCRIPTION

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

[0030] Embodiment 1:

[0031] See also Figures 1 to 5 As shown, a flow adaptive pile side grouting device comprises: a pile side annular grouting pipe 1, a vertical grouting pipe 5, a flow adaptive valve body 8 and a grouting nozzle 9. The pile side annular grouting pipe 1 is an annular opening structure, and one or more pile side annular grouting pipes 1 are provided. The middle part of the pile side annular grouting pipe 1 is connected to the vertical grouting pipe 5 through a three-way connector, and one or more pile side annular grouting pipes 1 are installed on the outside of the cast-in-place pile reinforcement cage through the vertical grouting pipe 5; both ends of the pile side annular grouting pipe 1 are provided with flow adaptive valve bodies 8, and the pile side annular grouting pipe 1 is also provided with multiple flow adaptive valve bodies 8 between the flow adaptive valve bodies 8 at both ends, and the outer end of the flow adaptive valve body 8 is connected to the slurry outlet nozzle 9.

[0032] The three-way connector includes: a first T-shaped tee 2, a switching straight pipe 3 and a first right-angle double-way 4. The two lateral ways of the first T-shaped tee 2 are respectively sealed and sleeved on the left and right sides of the middle part of the pile-side annular grouting pipe 1. A grouting inlet is provided on the radial inner side of the pile-side annular grouting pipe 1. The grouting inlet is connected to the longitudinal way of the first T-shaped tee 2. The longitudinal way of the first T-shaped tee 2 is connected to one end of the first right-angle double-way 4 through the switching straight pipe 3, and the other end of the first right-angle double-way 4 is connected to the vertical grouting pipe 5.

[0033] The flow adaptive pile side grouting device also includes: a second T-shaped tee 6 and a second right-angle double-way 7. The two ends of the pile side annular grouting pipe 1 are connected to two flow adaptive valve bodies 8 through two second right-angle double-ways 7 respectively. The pile side annular grouting pipe 1 is connected to multiple flow adaptive valve bodies 8 through multiple second T-shaped tees 6 between the two second right-angle double-ways 7.

[0034] The pile-side annular grouting pipe 1 is provided with a plurality of grouting outlets between the two second right-angle double-way pipes 7. The two lateral passages of the second T-shaped tee 6 are respectively sealed and sleeved on both sides of the corresponding grouting outlets, and the longitudinal passage of the second T-shaped tee 6 is connected to the flow adaptive valve body 8; one end of the second right-angle double-way pipe 7 is connected to the end of the pile-side annular grouting pipe 1, and the other end of the second right-angle double-way pipe 7 is connected to the flow adaptive valve body 8.

[0035] The flow adaptive valve body 8 includes: a valve body A801a, a slurry outlet head A802a, a spring A803a and a ball A804a. The left side opening of the valve body A801a is hollow inside, a valve hole A is opened in the middle of the right end of the valve body A801a, the left end of the slurry outlet head A802a is sealed and welded to the edge of the right end of the valve body A801a, the left side opening of the slurry outlet head A802a is hollow inside, a plurality of slurry outlet holes A are evenly opened at the right end of the slurry outlet head A802a, and the spring A803a is provided with a spherical body A804a. The right end of 03a is fixedly connected to the middle of the slurry outlet head A802a, and the spring A803a movably penetrates the valve hole A and is fixedly connected to the ball A804a in the inner cavity of the valve body A801a. The diameter of the ball A804a is larger than the diameter of the valve hole A, and the left end of the valve body A801a is threadedly sealed and connected to the longitudinal single-way of the second T-shaped tee 6 or the other end of the second right-angle double-way 7; in this embodiment, the cement slurry enters the valve hole A from the inner cavity of the valve body A801a and is then discharged from a plurality of slurry outlet holes A.

[0036] Embodiment 2:

[0037] In this embodiment, the flow adaptive valve body 8 is replaced on the basis of the first embodiment. The replaced flow adaptive valve body 8 includes: a valve body B801b, a slurry outlet head B802b, a spring B803b, a ball B804b and a partition B805b. The left side of the valve body B801b is open and the interior is hollow. A valve hole B is opened in the middle of the right end of the valve body B801b. The left end of the slurry outlet head B802b is sealed and welded to the edge of the right end of the valve body B801b. The left side of the slurry outlet head B802b is open and the interior is hollow. A plurality of slurry outlet holes B are evenly opened on the right end of the slurry outlet head B802b. The right end of the spring B803b is fixedly connected to the slurry outlet head B801b. In the middle of 802b, a spring B803b movably penetrates the valve hole B and is fixedly connected to a sphere B804b in the inner cavity of the valve body B801b. The diameter of the sphere B804b is larger than the diameter of the valve hole B. The inner cavity of the valve body B801b is located on the left side of the sphere B804b and is threadedly connected with a partition B805b. An injection hole B is opened in the middle of the partition B805b. The diameter of the injection hole B is smaller than the diameter of the sphere B804b. The left end of the valve body B801b is threadedly sealed and connected to the longitudinal single-way of the second T-shaped tee 6 or the other end of the second right-angle double-way 7. In this embodiment, the cement slurry enters the valve hole B through the injection hole B and is discharged through a plurality of slurry outlet holes B.

[0038] Embodiment three:

[0039] This embodiment replaces the flow adaptive valve body 8 on the basis of the first embodiment. The replaced flow adaptive valve body 8 includes: a valve body C801c, a partition C802c, a spring C803c and a ball C804c. The left side of the valve body C801c is open and hollow inside. A valve hole C is opened in the middle of the right end of the valve body C801c. The left side of the inner cavity of the valve body C801c is threadedly sealed and connected to the partition C802c. A number of injection holes C are evenly opened on the partition C802c. The left end of the spring C803c is fixedly connected to the middle of the partition C802c, and the right end of the spring C803c is fixedly connected to the ball C804c. The diameter of the ball C804c is larger than the diameter of the valve hole C. The left end of the valve body C801c is threadedly sealed and connected to the longitudinal single-way of the second T-shaped three-way 6 or the other end of the second right-angle two-way 7. In this embodiment, the cement slurry is discharged from the valve hole C through the several injection holes C.

[0040] A flow-adaptive pile side grouting construction method specifically comprises the following steps:

[0041] Step 1: Connect the flow-adaptive pile side grouting device to the cast-in-place pile reinforcement cage, wherein the pile side annular grouting pipe 1 is arranged outside the reinforcement cage, fixed to the reinforcement cage by steel wire, and connected to the vertical grouting pipe 5 through a three-way connector, and the vertical grouting pipe 5 is connected and arranged inside the reinforcement cage and is equal in length to the reinforcement cage;

[0042] Step 2: put the first steel cage into the pile hole, and before installing the next steel cage, fix the vertical grouting steel pipe 5 in the next steel cage in advance, and connect the vertical grouting steel pipe 5 when the steel cage is extended;

[0043] Step 3: construct the remaining steel cages in sequence, connect the vertical grouting pipe 5, until the cast-in-place pile construction is completed, and the vertical grouting pipe 5 is led out of the ground through the steel cage;

[0044] Step 4: Connect the vertical grouting pipe 5 leading out of the ground through the post-grouting equipment, and press the cement slurry into the flow-adaptive pile side grouting device through a grouting machine with flow control function, and achieve uniform grouting by controlling the grouting flow; control the grouting flow to gradually increase from zero, and observe the flow change in this process. When the flow is less than or equal to the total flow limiting flow of the adaptive pile side grouting device, all the flow adaptive valve bodies 8 on the pile side are in the opening condition, and the slurry discharge from the grouting holes on the pile side is adaptively adjusted according to the situation outside the hole. If one or more flow adaptive valve bodies 8 on the pile side are blocked, the corresponding grouting flow will be transmitted to the remaining grouting holes, making the total flow of the remaining flow adaptive valve bodies 8 greater than the flow limiting flow, and the remaining flow adaptively The valve body 8 is forced to close, and more pressure is transmitted to the non-flow adaptive valve body 8. When the pressure reaches a certain amount, the pile-side flow adaptive valve body 8 opens to rebalance the flow. Therefore, under the pile-side grouting device, the cement slurry on the pile side can be evenly distributed, avoiding the situation in the original pile-side grouting device that when one flow adaptive valve body 8 is opened, the other flow adaptive valve bodies 8 cannot be opened, and the cement slurry on the pile side cannot be evenly distributed; when the flow is greater than the total flow limiting flow of the adaptive pile-side grouting device, all flow adaptive valve bodies 8 are automatically closed due to the action of the flow limiter, and the grouting pressure continues to increase, realizing the pressure maintaining function after grouting. At this time, the grouting pump flow is maintained at not less than 5 minutes and then the grouting pump is turned off to complete the grouting.

[0045] The present invention is based on the traditional cast-in-place pile side post-grouting. By installing a self-adaptive grouting device on the pile side grouting pipe, it is possible to inject high-pressure cement slurry after the cast-in-place pile construction is completed. The pile side grouting can be discharged and evenly distributed through multiple grouting valves, thereby improving the stress performance of the cast-in-place pile side. It is low-carbon and environmentally friendly and can significantly reduce the design length of the cast-in-place pile.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A flow-adaptive pile side grouting device, characterized in that: include: A pile-side annular grouting pipe (1), a vertical grouting pipe (5), a flow adaptive valve body (8) and a grouting nozzle (9); the pile-side annular grouting pipe (1) is an annular opening structure; one or more pile-side annular grouting pipes (1) are provided; the middle of the pile-side annular grouting pipe (1) is connected to the vertical grouting pipe (5) via a three-way connector; one or more pile-side annular grouting pipes (1) are installed on the outside of the cast-in-place pile reinforcement cage via the vertical grouting pipe (5); both ends of the pile-side annular grouting pipe (1) are provided with a flow adaptive valve body (8); the pile-side annular grouting pipe (1) is further provided with a plurality of flow adaptive valve bodies (8) between the flow adaptive valve bodies (8) at both ends; the outer end of the flow adaptive valve body (8) is connected to a grouting nozzle (9).

2. A flow-adaptive pile side grouting device according to claim 1, characterized in that: The three-way connector comprises: a first T-shaped tee (2), a transition straight pipe (3) and a first right-angle double-way (4); the two lateral ways of the first T-shaped tee (2) are respectively sealed and sleeved on the left and right sides of the middle of the pile-side annular grouting pipe (1); a grouting inlet is provided on the radial inner side of the pile-side annular grouting pipe (1); the grouting inlet is connected to the longitudinal way of the first T-shaped tee (2); the longitudinal way of the first T-shaped tee (2) is connected to one end of the first right-angle double-way (4) through the transition straight pipe (3); and the other end of the first right-angle double-way (4) is connected to the vertical grouting pipe (5).

3. A flow-adaptive pile side grouting device according to claim 1, characterized in that: Also includes: A second T-shaped three-way connection (6) and a second right-angle two-way connection (7), the two ends of the pile-side annular grouting pipe (1) are connected to two flow adaptive valve bodies (8) through the two second right-angle two-way connections (7), and the pile-side annular grouting pipe (1) is connected to multiple flow adaptive valve bodies (8) through multiple second T-shaped three-way connections (6) between the two second right-angle two-way connections (7).

4. A flow-adaptive pile side grouting device according to claim 3, characterized in that: The pile-side annular grouting pipe (1) is provided with a plurality of grouting outlets between the two second right-angled double-way pipes (7); the two transverse pipes of the second T-shaped three-way pipe (6) are respectively sealed and sleeved on both sides of the corresponding grouting outlets; the longitudinal pipe of the second T-shaped three-way pipe (6) is connected to the flow adaptive valve body (8); one end of the second right-angled double-way pipe (7) is connected to the end of the pile-side annular grouting pipe (1), and the other end of the second right-angled double-way pipe (7) is connected to the flow adaptive valve body (8).

5. A flow rate adaptive pile side grouting device according to claim 4, characterized in that: The flow adaptive valve body (8) comprises: a valve body main body A (801a), a slurry outlet head A (802a), a spring A (803a) and a ball A (804a); the valve body main body A (801a) is open on the left side and hollow inside; a valve hole A is opened in the middle of the right end of the valve body main body A (801a); the left end of the slurry outlet head A (802a) is sealed and welded to the edge of the right end of the valve body main body A (801a); the left end of the slurry outlet head A (802a) is open on the left side and hollow inside; the slurry outlet head A (803a) is opened on the right side and hollow inside; 02a), a plurality of slurry outlet holes A are evenly opened at the right end, the right end of the spring A (803a) is fixedly connected to the middle of the slurry outlet head A (802a), the spring A (803a) movably passes through the valve hole A and is fixedly connected to the ball A (804a) in the inner cavity of the valve body A (801a), the diameter of the ball A (804a) is larger than the diameter of the valve hole A, and the left end of the valve body A (801a) is threadedly sealed and connected to the longitudinal single-way of the second T-shaped three-way (6) or the other end of the second right-angle two-way (7).

6. A flow rate adaptive pile side grouting device according to claim 4, characterized in that: The flow adaptive valve body (8) comprises: a valve body B (801b), a slurry outlet head B (802b), a spring B (803b), a ball B (804b) and a partition B (805b); the valve body B (801b) has an opening on the left side and is hollow inside; a valve hole B is provided in the middle of the right end of the valve body B (801b); the left end of the slurry outlet head B (802b) is sealed and welded to the edge of the right end of the valve body B (801b); the opening on the left side of the slurry outlet head B (802b) is hollow inside; a plurality of slurry outlet holes B are evenly provided at the right end of the slurry outlet head B (802b); the right end of the spring B (803b) is fixedly connected to the slurry outlet head B (804b); In the middle of the head B (802b), the spring B (803b) movably passes through the valve hole B and is fixedly connected to the ball B (804b) in the inner cavity of the valve body B (801b), the diameter of the ball B (804b) is larger than the diameter of the valve hole B, the inner cavity of the valve body B (801b) is located on the left side of the ball B (804b) and is threadedly connected to a partition B (805b), the middle of the partition B (805b) is provided with an injection hole B, the diameter of the injection hole B is smaller than the diameter of the ball B (804b), and the left end of the valve body B (801b) is threadedly sealed and connected to the longitudinal single-way of the second T-shaped three-way (6) or the other end of the second right-angle two-way (7).

7. The flow-adaptive pile side grouting device according to claim 4, characterized in that: The flow adaptive valve body (8) comprises: a valve body C (801c), a partition C (802c), a spring C (803c) and a ball C (804c). The left side of the valve body C (801c) is open and hollow inside. The middle part of the right end of the valve body C (801c) is provided with a valve hole C. The left side of the inner cavity of the valve body C (801c) is threadedly sealed and connected to the partition C (802c). The partition C (802c) is evenly provided with a plurality of injection holes C. The left end of the spring C (803c) is fixedly connected to the middle part of the partition C (802c). The right end of the spring C (803c) is fixedly connected to the ball C (804c). The diameter of the ball C (804c) is larger than the diameter of the valve hole C. The left end of the valve body C (801c) is threadedly sealed and connected to the longitudinal single-way of the second T-shaped three-way (6) or the other end of the second right-angle double-way (7).

8. A flow adaptive pile side grouting construction method, using the flow adaptive pile side grouting device according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: Connect the flow-adaptive pile side grouting device to the cast-in-place pile reinforcement cage, wherein the pile side annular grouting pipe (1) is arranged outside the reinforcement cage, fixed to the reinforcement cage by steel wire, and connected to the vertical grouting pipe (5) by a three-way connector, and the vertical grouting pipe (5) is connected and arranged inside the reinforcement cage and has the same length as the reinforcement cage; Step 2: The first section of the steel cage is placed in the pile hole. Before installing the next section of the steel cage, a vertical grouting steel pipe (5) is pre-fixed in the next section of the steel cage. When the steel cage is extended, the vertical grouting steel pipe (5) is connected at the same time; Step 3: construct the remaining steel cages in sequence, connect the vertical grouting pipe (5), until the cast-in-place pile construction is completed, and the vertical grouting pipe (5) is led out of the ground through the steel cage; Step 4: connect the vertical grouting pipe (5) leading out of the ground through the post-grouting equipment, press the cement slurry into the flow-adaptive pile side grouting device through a grouting machine with flow control function, and achieve uniform grouting by controlling the grouting flow.

9. A flow-adaptive pile side grouting construction method according to claim 8, characterized in that: The specific steps of step 4 are as follows: controlling the grouting flow rate to gradually increase from zero, and observing the flow rate change during this process; when the flow rate is less than or equal to the total flow rate of the adaptive pile side grouting device, all the flow adaptive valve bodies (8) on the pile side are in an open condition, and the grouting holes on the pile side are adaptively adjusted according to the situation outside the hole; if one or more flow adaptive valve bodies (8) on the pile side are blocked, the corresponding grouting flow rate will be transmitted to the remaining grouting holes, so that the total flow rate of the remaining flow adaptive valve bodies (8) is greater than the flow rate of the limiting flow rate, and the remaining flow adaptive valve bodies (8) are forced to close, and more pressure is transmitted to the blocked flow adaptive valve body (8); when the pressure reaches a certain amount, the pile side flow adaptive valve body (8) opens, so that the flow rate is rebalanced; when the flow rate is greater than the total flow rate of the adaptive pile side grouting device, all the flow adaptive valve bodies (8) are automatically closed due to the action of the limiter, and the grouting pressure continues to increase, realizing the pressure maintenance function after grouting; at this time, the grouting pump flow rate is maintained at not less than 5 minutes, and then the grouting pump is turned off to complete the grouting.

Images