Post-grouting type conical thorn pile for composite foundation and grouting device

Abstract

The invention provides a post-grouting type conical thorn pile for a composite foundation and a grouting device, and relates to the technical field of foundation treatment, the post-grouting type conical thorn pile comprises a concrete pile body, a grouting hole, a sleeve with the same length as the concrete pile body, a discharging hole, a dispersing assembly, a supporting edge, a scraping ring, a lower sealing piece, an upper sealing piece, a connecting rod, a pressurizing grouting assembly, a positioning assembly and a supporting assembly; according to the device, targeted grouting can be carried out on complex geology of different heights through graded grouting, that is, different slurries can be injected into the concrete pile body at different heights, and a stable and dispersed cone thorn structure is formed by selecting different grouting pressures; the side friction resistance of the concrete pile body is greatly improved, the overall bearing capacity of the concrete pile body after a composite foundation is subsequently assembled is enhanced, the subsequent maintenance cost of the concrete pile body is low, the concrete pile body is convenient and fast to use, the adaptation effect on different soil environments is good, and the concrete pile body is suitable for batch pile sinking construction.

Description

Technical Field

[0001] The invention relates to the technical field of foundation treatment, in particular to a post-grouting type cone-pierced pile and a grouting device for a composite foundation. Background Art

[0002] Pile foundation can effectively improve the bearing capacity of the foundation and reduce the compressibility of the foundation. It is an indispensable key process in soft soil foundation treatment projects. The existing pile foundation forms mainly include cement soil mixing piles, CFG piles, gravel piles, precast concrete piles, etc., and different pile foundations are applicable to different scenarios. In comparison, precast concrete piles have the advantages of easy mass production, easy to ensure pile quality, and simple splicing. When used for foundation treatment, the single pile has a strong bearing capacity, small settlement deformation, and is not easily affected by groundwater levels, etc., and the construction efficiency is fast. It is widely used in soft foundation treatment projects.

[0003] At present, precast concrete piles are mainly hollow piles, including precast pipe piles and precast square piles. When used in composite foundation to treat soft soil foundation, precast concrete piles are mostly small diameter (side length) piles, and their bearing mechanism is mainly the side friction of the pile body and the end resistance of the pile. Among them, the side friction of precast concrete piles in composite foundation contributes more than 80% of the bearing capacity.

[0004] During pile driving construction, the precast concrete piles are first driven into the foundation by hammering or static pressure, and then the soil squeezing effect of the precast piles is used to form effective squeezing and friction resistance on the surrounding soil, so that the precast piles have a certain vertical bearing capacity. However, the outer sides of the existing precast concrete piles are mostly smooth side walls, and thus the bearing capacity is average.

[0005] Announcement No. CN203639903U proposes a prefabricated pipe pile structure with enhanced side friction resistance. Although the device can enhance the side friction resistance of the prefabricated pipe pile, it is not possible to select different grouting liquids at different parts of the pile body and control different grouting pressures accordingly, and is not flexible enough to cope with complex geological conditions or foundation construction with special reinforcement requirements. In addition, the earth bag has poor adaptability under different soil conditions, especially when the soil properties change greatly, the side friction resistance it provides will be affected. At the same time, its installation and maintenance costs are high, and it is not suitable for use in batch pile construction. Summary of the invention

[0006] The purpose of the present invention is to solve the problems raised in the above background technology, and then propose a post-grouting type cone-pierced pile and a grouting device for composite foundation.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] A post-grouting cone-pierced pile and grouting device for composite foundation, comprising a concrete pile body, a grouting hole, a sleeve with the same length as the concrete pile body, a discharge hole, a dispersion component, a supporting edge, a scraper ring, a lower sealing component, an upper sealing component, a connecting rod, a pressurized grouting component, a positioning component and a supporting component.

[0009] The grouting holes are distributed along the circumference of the concrete pile body and are arranged in multiple groups in the height direction;

[0010] The circumference of the casing is arranged inside the concrete pile body and is equal to the number of a group of grouting holes;

[0011] The discharge holes are arranged on the casing along the height direction and correspond to and are connected with the grouting holes one by one;

[0012] The dispersion component is arranged inside the grouting hole so that the slurry is ejected in multiple directions to form a dispersed cone thorn structure;

[0013] The supporting edge is arranged in a fixed area at the bottom of the casing;

[0014] The scraper ring fits the inner wall of the casing;

[0015] The lower seal is connected to the scraper ring;

[0016] The upper sealing member is connected to the lower sealing member through a connecting rod, and a grouting cavity is formed between the upper sealing member, the lower sealing member and the casing;

[0017] The pressurized grouting assembly passes through the upper sealing member and communicates with the grouting cavity;

[0018] The positioning assembly is arranged on the sleeve and the upper sealing member so that the grouting cavity can face one of the discharge holes every time it moves up and down;

[0019] The support assembly is arranged on the scraper ring and is electrically connected to the positioning assembly to limit the position of the grouting cavity after the movement of the grouting cavity is completed.

[0020] Furthermore, the dispersion component includes a dispersion plate and an injection pipe. A dispersion plate is arranged in each grouting hole, and the bottom of the dispersion plate is spaced apart from the bottom of the grouting hole. A plurality of dispersion holes facing different directions are opened on the dispersion plate, and a injection pipe is connected to the outside of each dispersion hole.

[0021] Furthermore, a first one-way valve is provided on the injection pipe.

[0022] In the above scheme, the slurry will be pressurized into multiple injection pipes facing different directions and then ejected outward in a divergent and irregular high-speed manner to present a cone-shaped structure. The first one-way valve can be used to prevent the slurry from flowing out but not in. Subsequently, when the concrete pile body is unstable, secondary grouting can be performed to further increase the lateral friction resistance of the concrete pile body.

[0023] Furthermore, the pressurized grouting assembly includes a high-pressure grouting pipe, a second one-way valve, a grouting pump and a hose. One end of the high-pressure grouting pipe passes through the upper seal to connect to the grouting chamber and a second one-way valve is provided on the high-pressure grouting pipe. The other end of the high-pressure grouting pipe is connected to the grouting pump through the hose.

[0024] Furthermore, the positioning assembly includes an infrared transmitter and an infrared receiver. The upper sealing member is provided with an infrared transmitter, and the sleeve is provided with a plurality of infrared receivers which are equidistantly and embeddedly arranged opposite to the infrared transmitter and electrically connected to the infrared transmitter.

[0025] The above scheme can accurately define the movement position of the grouting chamber after each lifting and lowering through the positioning component, and automatically trigger the support component to complete the position definition after detecting the accurate position signal, thereby eliminating the need for manual positioning multiple times and reducing the difficulty of operation.

[0026] Furthermore, the supporting assembly includes a mounting rod, a micro-cylinder and an arc-shaped support plate. The mounting rod is arranged inside the scraper ring, and the micro-cylinder is symmetrically arranged on the mounting rod. The micro-cylinder is connected to the arc-shaped support plate. The scraper ring is provided with a through hole facing the arc-shaped support plate and matching its size so that the arc-shaped support plate can automatically fit tightly with the inner wall of the casing after the positioning assembly detects a signal.

[0027] The above solution uses a micro cylinder to make the arc-shaped support plate fit tightly against the inner wall of the casing, thereby limiting the position of the lower sealing member in the casing to avoid position movement during the pressurized grouting process.

[0028] Furthermore, the arc-shaped support plate is provided with protrusions and anti-slip textures.

[0029] Furthermore, the discharge hole, the upper surface of the lower sealing member and the lower surface of the upper sealing member are all arranged to be inclined and the inclinations are kept consistent.

[0030] The above scheme can reduce the probability of pressurized injected slurry accumulating and remaining on the surface of the seal, and allow it to flow more smoothly into the discharge hole and enter the grouting hole to be ejected at high speed to form a cone-shaped thorn structure.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This device can carry out targeted grouting for complex geology at different heights through graded grouting, that is, different slurries can be injected into different heights of the concrete pile body and different grouting pressures can be selected to form a stable and dispersed cone thorn structure, thereby greatly improving the lateral friction resistance of the concrete pile body and thus enhancing the overall bearing capacity after the subsequent assembly of the composite foundation. The subsequent maintenance cost of the concrete pile body is low and convenient, and it has a good adaptability to different soil environments, and is suitable for batch pile sinking construction.

[0033] 2. The purpose of leaving a gap between the dispersion plate and the grouting hole in this device is to reduce the influence of the dispersion plate on the pressurized injection of the slurry. At the same time, most of the slurry will enter multiple injection pipes facing different directions and then be injected outward at high speed in a divergent shape to present a cone-shaped structure. The first one-way valve can make the slurry only go out but not in. Then, when the concrete pile body is unstable, secondary grouting can be performed to further increase the lateral friction resistance of the concrete pile body.

[0034] 3. When the device needs to increase the side friction of the concrete pile body for a second time, the seal is first placed in, and then the scraper ring can automatically scrape off the solidified slurry attached to the inner wall of the casing while driving the lower seal to move, and effectively reduce the wear of the lower seal; that is, the scraper ring has two functions, the first is to limit the orientation of the grouting chamber through the internally installed support assembly during pressurized grouting, and the other is to effectively scrape off the solidified material in the casing during the subsequent secondary grouting.

[0035] 4. This device can accurately define the movement position of the grouting chamber after each lifting and lowering through the positioning component, and automatically trigger the support component to complete the position definition after detecting the accurate position signal, thereby eliminating the need for multiple manual positioning, reducing the difficulty of manual positioning work, and one adjustment can efficiently complete the subsequent graded pressurized grouting process at different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 for Figure 1 A partial enlarged view of the label A;

[0038] Figure 3 This is a schematic diagram of the installation of a micro cylinder;

[0039] Reference numerals:

[0040] 1. Concrete pile body; 11. Grouting hole; 2. Casing; 21. Discharge hole; 3. Dispersion plate; 31. Injection pipe; 32. First one-way valve; 4. Support rib; 41. Scraper ring; 42. Lower seal; 43. Upper seal; 44. Connecting rod; 45. High-pressure grouting pipe; 46. Second one-way valve; 47. Infrared transmitter; 48. Infrared receiver; 51. Mounting rod; 52. Micro cylinder; 53. Arc support plate; 54. Rubber convex particles. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention is further described in combination with the drawings and embodiments:

[0042] like Figures 1 to 3 As shown, a post-grouting cone-pierced pile and grouting device for composite foundation includes a concrete pile body 1, a grouting hole 11, a sleeve 2 with the same length as the concrete pile body 1, a discharge hole 21, a dispersion component, a support rib 4, a scraper ring 41, a lower seal 42, an upper seal 43, a connecting rod 44, a pressurized grouting component, a positioning component and a support component.

[0043] The grouting holes 11 are distributed along the circumference of the concrete pile body 1 and are arranged in multiple groups in the height direction thereof;

[0044] The casing 2 is circumferentially arranged inside the concrete pile body 1 and is equal in number to a group of grouting holes 11;

[0045] The discharge holes 21 are formed on the casing 2 along the height direction and correspond to and communicate with the grouting holes 11 one by one;

[0046] The dispersion component is arranged inside the grouting hole 11 so that the slurry is ejected in multiple directions to form a dispersed cone thorn structure;

[0047] The supporting edge 4 is arranged at the bottom fixing area of ​​the sleeve 2;

[0048] The scraper ring 41 is in contact with the inner wall of the sleeve 2;

[0049] The lower seal 42 is connected to the scraper ring 41;

[0050] The upper sealing member 43 is connected to the lower sealing member 42 via a connecting rod 44, and a grouting cavity is formed between the upper sealing member 43, the lower sealing member 42 and the casing 2;

[0051] The pressurized grouting assembly passes through the upper sealing member 43 and communicates with the grouting cavity;

[0052] The positioning assembly is arranged on the sleeve 2 and the upper sealing member 43 so that the grouting cavity can face one of the discharge holes 21 every time it moves up and down;

[0053] The support assembly is arranged on the scraper ring 41 and is electrically connected to the positioning assembly to limit the position of the grouting cavity after the movement is completed.

[0054] Further refinement of the embodiments of the present invention is as follows: Figure 1 and Figure 2As shown, the dispersion assembly includes a dispersion plate 3 and a spray pipe 31. A dispersion plate 3 is arranged in each grouting hole 11, and the bottom of the dispersion plate 3 is spaced from the bottom of the grouting hole 11. The dispersion plate 3 is provided with a plurality of dispersion holes facing different directions, and each dispersion hole is connected to a spray pipe 31 on its outer side.

[0055] Further optimization of the above scheme, such as Figure 2 As shown, a first one-way valve 32 is provided on the injection pipe 31 .

[0056] Further refinement of the embodiments of the present invention is as follows: Figure 2 As shown, the pressurized grouting assembly includes a high-pressure grouting pipe 45 (the high-pressure grouting pipe 45 is a hard pipe), a second one-way valve 46, a grouting pump and a hose. One end of the high-pressure grouting pipe 45 passes through the upper seal 43 to connect to the grouting chamber and a second one-way valve 46 is provided on the high-pressure grouting pipe 45. The other end of the high-pressure grouting pipe 45 is connected to the grouting pump through a hose. The grouting pump and the hose are not shown in the figure. The hose adopts a fiber-reinforced high-pressure hose, and the working pressure can reach 40MPa.

[0057] Further refinement of the embodiments of the present invention is as follows: Figure 2 As shown, the positioning assembly includes an infrared transmitter 47 and an infrared receiver 48. The upper seal 43 is provided with an infrared transmitter 47, and the sleeve 2 is provided with a plurality of infrared receivers 48 which are distributed opposite to the infrared transmitter 47 and are electrically connected thereto and are equidistantly and embedded therein.

[0058] Further refinement of the embodiments of the present invention is as follows: Figure 3 As shown, the support assembly includes a mounting rod 51, a micro cylinder 52 and an arc-shaped support plate 53. The mounting rod 51 is arranged inside the scraper ring 41, and the micro cylinder 52 is symmetrically arranged on the mounting rod 51. The micro cylinder 52 is connected to the arc-shaped support plate 53. The scraper ring 41 is provided with a through hole that is directly opposite to the arc-shaped support plate 53 and is adapted to its size so that the arc-shaped support plate 53 automatically fits tightly with the inner wall of the sleeve 2 after the positioning assembly detects a signal. The through hole is not shown in the figure;

[0059] As a further optimization of the above embodiment, the arc-shaped support plate 53 is provided with protrusions and anti-skid textures, which are not shown in the figure.

[0060] Further refinement of the embodiments of the present invention is as follows: Figure 1 and Figure 2 As shown, the lower surface of the upper seal 43, the upper surface of the lower seal 42 and the discharge hole 21 are all inclined and the inclination is kept consistent. This reduces the probability of pressurized injected slurry accumulating and remaining on the surface of the seal, allowing it to flow more smoothly into the discharge hole 21 and enter the grouting hole 11 to be ejected at high speed to form a cone-shaped structure.

[0061] It should be noted that the grouting pump, the infrared transmitter 47, the infrared receiver 48 and the micro cylinder 52 are all electrically connected to the controller, which is not shown in the figure.

[0062] The workflow of the present invention is:

[0063] First, the upper seal 43 and the lower seal 42 are installed together into the casing 2. During the initial installation, the infrared transmitter 47 and the infrared receiver 48 are arranged opposite to each other. Then, the lower seal 42 is lowered. When the scraper ring 41 contacts the supporting edge 4, it stops descending. At this time, the grouting cavity is opposite to the discharge hole 21 at the bottom of the casing 2.

[0064] Then the controller controls the grouting pump to work and inject the slurry into the grouting cavity, and then the slurry flows along the discharge hole 21 to the grouting hole 11. At this time, a part of the slurry is ejected from the gap between the dispersion plate 3 and the grouting hole 11. The significance of this design is to reduce the influence of the dispersion plate 3 on the pressurized injection of the slurry. At the same time, most of the slurry will enter a plurality of injection pipes 31 facing different directions and then be ejected outward in a divergent and irregular high-speed manner to present a cone thorn structure. The first one-way valve 32 can make the slurry only go out but not in, and then when the concrete pile body is unstable, secondary grouting can be performed to further increase the lateral friction resistance of the concrete pile body 1.

[0065] After the grouting of the bottom grouting hole 11 is completed, the high-pressure grouting pipe 45 can be driven to move upward, and then the upper seal 43 and the lower seal 42 start to move upward. When the signal emitted by the infrared transmitter 47 is received by the first infrared receiver 48 above, a signal will be fed back to the controller, and then the controller controls the micro cylinder 52 to extend so that the arc support plate 53 is tightly fitted with the inner wall of the casing 2, thereby realizing the position limitation of the lower seal 42 in the casing 2. At this time, the grouting cavity is facing the next discharge hole 21, and then the above process is repeated to realize the graded grouting process at the height of the discharge hole 21. At this time, the slurry will impact the lower seal 42 under the action of the grouting pump, but due to the action of the support component, the position limitation of the grouting cavity can be realized, and no position deviation will occur during the pressurized grouting process. After the grouting of the second height concrete pile body 1 is completed, a divergent cone thorn structure will be formed again, and then the outer support limitation of the casing 2 is released and it can be accurately moved up to the position of the next discharge hole 21 again.

[0066] Repeating the above process can realize the graded grouting process of the concrete pile body 1 to improve the lateral friction resistance through the cone thorn structure, and different slurries can be selected and the injection pressure of the slurry can be controlled before each grouting to enhance the lateral friction resistance of the concrete pile body 1 in response to complex geology;

[0067] After the grouting of all the grouting holes 11 of the concrete pile body 1 is completed, the seal can be taken out. During the graded upward movement of the grouting cavity, slurry will adhere to the inner wall of the casing 2, which will gradually solidify after a long time. Then, when the side friction resistance of the concrete pile body 1 needs to be increased for a second time, the seal will be put in first. Then, in the process of driving the lower seal 42 to move, the scraper ring 41 can automatically scrape off the attached solidified slurry, and effectively reduce the wear of the lower seal 42; thereby extending the service life of the seal; that is, the scraper ring 41 has two functions, the first is to limit the orientation of the grouting cavity through the internally installed support assembly during pressurized grouting, and the other function is to effectively scrape off the solidified material in the casing 2 during the subsequent secondary grouting;

[0068] When the length of the concrete pile body 1 needs to be extended, a flange connection can be used. The flange is not numbered in the figure. At the same time, when the concrete pile body 1 is extended, the length of the high-pressure grouting pipe 45 can be extended through the joint to facilitate the subsequent staged grouting process to be carried out flexibly.

[0069] Compared with the prior art, the present device can carry out targeted grouting for complex geology at different heights through graded grouting, that is, different slurries can be injected into different heights of the concrete pile body 1 and different grouting pressures can be selected to form a stable and dispersed cone thorn structure, thereby greatly improving the lateral friction resistance of the concrete pile body 1 and thus enhancing its overall bearing capacity after subsequent assembly of the composite foundation. In addition, the subsequent maintenance of the concrete pile body 1 is convenient, and it has good adaptability to different soil environments, and is suitable for batch pile sinking construction.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A post-grouting cone-pierced pile and grouting device for composite foundation, characterized in that: The invention comprises a concrete pile body (1), a grouting hole (11), a sleeve (2) having the same length as the concrete pile body (1), a discharge hole (21), a dispersion component, a support rib (4), a scraper ring (41), a lower sealing member (42), an upper sealing member (43), a connecting rod (44), a pressurized grouting component, a positioning component and a support component. The grouting holes (11) are distributed along the circumference of the concrete pile body (1) and are arranged in multiple groups in the height direction thereof; The sleeve (2) is circumferentially arranged inside the concrete pile body (1) and has the same number as a group of grouting holes (11); The discharge holes (21) are arranged on the casing (2) along the height direction and correspond to and communicate with the grouting holes (11) one by one; The dispersion component is arranged inside the grouting hole (11) so that the slurry is ejected in multiple directions to form a dispersed cone thorn structure; The supporting rib (4) is arranged in a fixed area at the bottom of the sleeve (2); The scraper ring (41) is in contact with the inner wall of the sleeve (2); The lower sealing member (42) is connected to the scraper ring (41); The upper sealing member (43) is connected to the lower sealing member (42) via a connecting rod (44), and a grouting cavity is formed between the upper sealing member (43), the lower sealing member (42) and the casing (2); The pressurized grouting assembly passes through the upper sealing member (43) and is connected to the grouting cavity; The positioning assembly is arranged on the sleeve (2) and the upper sealing member (43) so that the grouting cavity can face one of the discharge holes (21) each time it moves up and down; The support component is arranged on the scraper ring (41) and is electrically connected to the positioning component to limit the position of the grouting cavity after the movement of the grouting cavity is completed.

2. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 1, characterized in that: The dispersion component comprises a dispersion plate (3) and a spray pipe (31), each grouting hole (11) is provided with a dispersion plate (3), and the bottom of the dispersion plate (3) is spaced apart from the bottom of the grouting hole (11), the dispersion plate (3) is provided with a plurality of dispersion holes facing different directions, and each dispersion hole is connected to a spray pipe (31) on its outer side.

3. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 2, characterized in that: The injection pipe (31) is provided with a first one-way valve (32).

4. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 1, characterized in that: The pressurized grouting assembly comprises a high-pressure grouting pipe (45), a second one-way valve (46), a grouting pump and a hose. One end of the high-pressure grouting pipe (45) passes through an upper sealing member (43) to communicate with the grouting chamber and a second one-way valve (46) is provided on the high-pressure grouting pipe (45). The other end of the high-pressure grouting pipe (45) is connected to the grouting pump via the hose.

5. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 1, characterized in that: The positioning assembly comprises an infrared transmitter (47) and an infrared receiver (48). The upper sealing member (43) is provided with the infrared transmitter (47), and a plurality of infrared receivers (48) are equidistantly and embeddedly arranged on the sleeve (2) and are distributed opposite to the infrared transmitter (47) and electrically connected to the infrared receiver (48).

6. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 1, characterized in that: The support assembly comprises a mounting rod (51), a micro cylinder (52) and an arc-shaped support plate (53); the mounting rod (51) is arranged inside the scraper ring (41); the micro cylinder (52) is symmetrically arranged on the mounting rod (51); the micro cylinder (52) is connected to the arc-shaped support plate (53); the scraper ring (41) is provided with a through hole which is directly opposite to the arc-shaped support plate (53) and has a size matching the arc-shaped support plate (53) so that the arc-shaped support plate (53) automatically fits tightly with the inner wall of the sleeve (2) after the positioning assembly detects a signal.

7. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 6, characterized in that: The arc-shaped support plate (53) is provided with rubber protrusions (54) and anti-slip textures.

8. The post-grouting cone-pierced pile and grouting device for composite foundation according to claim 1, characterized in that: The discharge hole (21), the upper surface of the lower sealing member (42) and the lower surface of the upper sealing member (43) are all arranged to be inclined and the inclinations are kept consistent.

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