Post-grouting pressurizing device for pile bottom of cast-in-situ bored pile

Abstract

The invention discloses a bored pile bottom post-grouting pressurizing device, and relates to the technical field of bored pile bottom post-grouting, the bored pile bottom post-grouting pressurizing device comprises a grouting pipe, the grouting pipe is filled with slurry, the top of the slurry is provided with a sealing plate, the grouting pipe is internally provided with a pressurizing mechanism, the pressurizing mechanism comprises a pressurizing water tank arranged in the grouting pipe, and the pressurizing water tank is provided with a water inlet and a water outlet. A partition plate is fixedly mounted at the edge of the bottom of the pressurizing water tank, a positioning sleeve is fixedly mounted below the partition plate, an impact mechanism is mounted at the positioning sleeve, the pressurizing mechanism comprises a water pumping pipe and a water inlet pipe which are connected to the pressurizing water tank, and a waterproof shell is fixedly mounted in the middle of the upper surface of the partition plate; a sliding groove is formed in the side wall of the positioning sleeve. According to the pressure device for post-grouting of the pile bottom of the cast-in-situ bored pile, through cooperative use of the pressure mechanism and the impact mechanism, sufficient pressure can be applied to slurry in the grouting pipe, the use of water is reduced, then the time for water injection and water pumping is shortened, and the construction speed is increased.

Description

Technical Field

[0001] This invention relates to the field of post-grouting technology for bored piles, specifically a post-grouting pressurization device for bored piles. Background Technology

[0002] When drilling and grouting piles in soft strata, post-grouting is often carried out to reinforce the foundation and enhance the bearing capacity of the pile tip and the surrounding strata within a certain range. During the grouting process, air bubbles are prone to appear inside the pile bottom, causing hollowing and affecting the quality of the pile.

[0003] In the prior art, patent announcement number CN217480166U discloses a post-grouting pressurization device for bored cast-in-place piles, including a water tank, a grout storage chamber, a drainage pump, and a grouting pipe. The water tank is equipped with a water pump, and the outlet of the water pump is connected to a water delivery pipe. The end of the water delivery pipe is connected to the grouting pipe. The outlet of the grout storage chamber is connected to a pressure grouting pump through a connecting pipe. The outlet of the pressure grouting pump is connected to a grout delivery pipe, and the end of the grout delivery pipe is connected to the pressure grouting pipe, which is located inside the grouting pipe.

[0004] The aforementioned device pressurizes the grout by injecting water into the water chamber, using the gravity of the water to press down the sealing plate and prevent air pockets from forming inside the grouting pipe due to air resistance. However, maintaining the pressure requires a large amount of water during the pressurization process, and both the water injection and pumping stages are time-consuming, resulting in a slow construction progress. Summary of the Invention

[0005] The purpose of this invention is to provide a post-grouting and pressurization device for bored cast-in-place piles to solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a grouting and pressurizing device for the bottom of a bored cast-in-place pile, comprising a grouting pipe filled with grout, a sealing plate at the top of the grout, a pressurizing mechanism inside the grouting pipe, the pressurizing mechanism comprising a pressurizing water tank disposed inside the grouting pipe, a partition plate fixedly installed at the bottom edge of the pressurizing water tank, a positioning sleeve fixedly installed below the partition plate, and an impact mechanism installed at the positioning sleeve.

[0007] Preferably, the pressurizing mechanism includes a pumping pipe and an inlet pipe connected to the pressurizing water tank, a waterproof shell is fixedly installed at the middle position of the upper surface of the partition, and a sliding groove is provided on the side wall of the positioning sleeve.

[0008] Preferably, the pressurized water tank is provided with a connection port, and both the water pump pipe and the water inlet pipe are connected to the pressurized water tank through the connection port.

[0009] Preferably, the partition is fixed to the pressurized water tank by welding, and the waterproof shell is fixed to the partition by welding.

[0010] Preferably, the impact mechanism includes a motor fixedly installed in a waterproof housing and an impact block slidably installed in a positioning sleeve. A storage spring is provided above the impact block, and sliding feet are fixedly installed on both sides of the impact block and are slidably installed in a groove. A planetary reducer is connected to the output end of the motor, and a drive shaft is fixedly installed on the output end of the planetary reducer. A drive frame is fixedly installed at the end of the drive shaft, a wedge block is fixedly installed at one end of the drive shaft, and a counterweight block is fixedly installed at the other end of the drive shaft.

[0011] Preferably, a through hole is provided in the middle of the partition, and the output end of the motor passes through the partition through the through hole.

[0012] Preferably, the impact block is movably mounted in the positioning sleeve via a sliding support foot, one end of the energy storage spring is connected to the impact block, the other end of the energy storage spring is connected to the top plate of the positioning sleeve, the drive shaft is rotatably mounted below the partition, and the wedge block is rotatably mounted on both sides of the sliding support foot via a drive frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this application, liquid is injected into the pressurized water tank through the inlet pipe. The static pressure of the liquid applies pressure to the grout in the injection pipe. Simultaneously, the liquid in the pressurized water tank is discharged through the pumping pipe, making it easy for the user to remove the pressurized water tank. The waterproof shell prevents the liquid from directly contacting the motor, while the baffle ensures that the liquid is effectively blocked above the impact mechanism.

[0014] 2. In this application, after the motor starts, it drives the drive shaft to rotate, which in turn drives the wedge block to rotate. During rotation, the wedge block pushes the sliding support upward, causing the impact block to move upward and compress the energy storage spring. When the impact block reaches its highest point, the wedge block disengages from the sliding support, at which point the energy storage spring rapidly releases its stored elastic potential energy. This energy release causes the impact block to strike the sealing plate downward, applying pressure to the grout in the grouting pipe, thereby reducing water usage, shortening the time for water injection and pumping, and thus improving construction efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the pressurization mechanism of the present invention; Figure 4This is a schematic diagram of the impact mechanism of the present invention.

[0016] The following are the labeling elements in the diagram: 1. Grout; 2. Sealing plate; 3. Grouting pipe; 4. Pressurization mechanism; 401. Pressurization water tank; 402. Partition plate; 403. Positioning sleeve; 404. Slide groove; 405. Waterproof shell; 406. Pumping pipe; 407. Inlet pipe; 5. Impact mechanism; 501. Motor; 502. Planetary reducer; 503. Drive shaft; 504. Drive frame; 505. Wedge block; 506. Impact block; 507. Sliding support; 508. Storage spring; 509. Counterweight. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution for a grouting and pressurizing device at the bottom of a bored pile, including a grouting pipe 3, which is filled with grout 1, a sealing plate 2 on the top of the grout 1, a pressurizing mechanism 4 inside the grouting pipe 3, and an impact mechanism 5 installed at the positioning sleeve 403. By using the pressurizing mechanism 4 and the impact mechanism 5 together, sufficient pressure can be applied to the grout 1 inside the grouting pipe 3, reducing the use of water, thereby shortening the time for water injection and pumping, and improving the construction speed.

[0019] like Figure 2 and Figure 3 As shown, the pressurizing mechanism 4 includes a pressurizing water tank 401 disposed inside the grouting pipe 3. A partition 402 is fixedly installed at the bottom edge of the pressurizing water tank 401, and a positioning sleeve 403 is fixedly installed below the partition 402. The pressurizing mechanism 4 includes a pumping pipe 406 and an inlet pipe 407 connected to the pressurizing water tank 401. A waterproof shell 405 is fixedly installed at the middle position of the upper surface of the partition 402. A sliding groove 404 is provided on the side wall of the positioning sleeve 403. A connection port is provided on the pressurizing water tank 401. The pumping pipe 406 and the inlet pipe 407 are both connected to the pressurizing water tank 401 through the connection port.

[0020] Specifically, the user can inject an appropriate amount of water into the pressurized water tank 401 through the water inlet pipe 407, using the natural gravity of the water to apply a certain pressure to the grout 1 located in the grouting pipe 3. Furthermore, the user can drain the water from the pressurized water tank 401 through the water outlet pipe 406, which allows for easy removal of the pressurized water tank 401 when needed. The waterproof housing 405 ensures that water does not come into contact with the motor 501, thus avoiding potential short-circuit risks. Meanwhile, the design of the baffle 402 also plays a crucial role, effectively blocking water above the impact mechanism 5, ensuring the safe and stable operation of the entire system.

[0021] like Figure 2 and Figure 4 As shown, the impact mechanism 5 includes a motor 501 fixedly installed in the waterproof housing 405 and an impact block 506 slidably installed in the positioning sleeve 403. A storage spring 508 is provided above the impact block 506. Sliding feet 507 are fixedly installed on both sides of the impact block 506 and are slidably installed in the slide groove 404. The output end of the motor 501 is connected to a planetary reducer 502. A drive shaft 503 is fixedly installed on the output end of the planetary reducer 502. A drive frame 504 is fixedly installed at the end of the drive shaft 503. A wedge block 505 is fixedly installed at one end of the drive shaft 503 and a counterweight block 509 is fixedly installed at the other end of the drive shaft 503. A through hole is opened in the middle of the partition 402, and the output end of the motor 501 passes through the partition 402 through the through hole.

[0022] Specifically, after the motor 501 is started, it drives the connected drive shaft 503 to rotate. As the drive shaft 503 rotates, it further drives the connected wedge block 505 to rotate as well. During the rotation of the wedge block 505, it pushes the sliding support 507 upwards in a specific mechanical manner. This pushing action causes the impact block 506 to move upwards, compressing the energy storage spring 508 in the process. As the impact block 506 continues to rise, when it reaches its highest point, the wedge block 505 disengages from the sliding support 507. Once the wedge block 505 disengages from the sliding support 507, the energy storage spring 508 immediately releases the previously stored elastic potential energy. This rapid energy release causes the impact block 506 to move downwards and impact the sealing plate 2 with a certain force. This impact applies additional pressure to the grout 1 inside the grouting pipe 3, which helps reduce the amount of water used during construction. By reducing water usage, the time required for water injection and pumping can be effectively shortened, thereby improving the efficiency and speed of the entire construction process.

[0023] Working principle: First, the pressurized water tank 401 is placed above the grout 1 in the grouting pipe 3. Then, water can be injected into the pressurized water tank 401 through the water inlet pipe 407. The gravity of the water applies pressure to the grout 1 in the grouting pipe 3. At the same time, the water in the pressurized water tank 401 can be discharged through the water pumping pipe 406, making it convenient for the user to remove the pressurized water tank 401. When the pressurized water tank 401 applies pressure to the grout 1, the motor 501 can be started. After the motor 501 is started, it will drive the drive shaft 503 to rotate. After the drive shaft 503 rotates, it will drive the wedge block 505 to rotate. During the rotation of the wedge block 505, it will push the sliding support foot 507 upward, causing the impact block 506 to move upward and compress the energy storage spring 508. When the impact block 506 moves upward to the highest point, the wedge block 505 will disengage from the sliding support foot 507. After the wedge block 505 disengages from the sliding support foot 507, the energy storage spring 508 will quickly release its stored elastic potential energy, thereby driving the impact block 506 to strike the sealing plate 2 downward, applying additional pressure to the grout 1 in the grouting pipe 3, thereby reducing the use of water, shortening the time for water injection and pumping, and improving the construction speed.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A grouting and pressurization device for the bottom of a bored cast-in-place pile, comprising a grouting pipe (3), wherein the grouting pipe (3) is filled with grout (1), and a sealing plate (2) is provided on the top of the grout (1), characterized in that: The grouting pipe (3) is provided with a pressurizing mechanism (4). The pressurizing mechanism (4) includes a pressurizing water tank (401) installed in the grouting pipe (3). A partition (402) is fixedly installed at the bottom edge of the pressurizing water tank (401). A positioning sleeve (403) is fixedly installed below the partition (402). An impact mechanism (5) is installed at the positioning sleeve (403).

2. The post-grouting and pressurization device for bored cast-in-place piles according to claim 1, characterized in that: The pressurizing mechanism (4) includes a pumping pipe (406) and an inlet pipe (407) connected to the pressurizing water tank (401). A waterproof shell (405) is fixedly installed in the middle of the upper surface of the partition (402). A sliding groove (404) is provided on the side wall of the positioning sleeve (403).

3. The post-grouting and pressurization device for bored cast-in-place piles according to claim 2, characterized in that: The pressurized water tank (401) is provided with a connection port, and the water pumping pipe (406) and the water inlet pipe (407) are both connected to the pressurized water tank (401) through the connection port.

4. The post-grouting and pressurization device for bored cast-in-place piles according to claim 3, characterized in that: The partition (402) is fixed to the pressurized water tank (401) by welding, and the waterproof shell (405) is fixed to the partition (402) by welding.

5. The post-grouting and pressurization device for bored cast-in-place piles according to claim 4, characterized in that: The impact mechanism (5) includes a motor (501) fixedly installed in a waterproof housing (405) and an impact block (506) slidably installed in a positioning sleeve (403). A storage spring (508) is provided above the impact block (506). Sliding feet (507) are fixedly installed on both sides of the impact block (506), and the sliding feet (507) are slidably installed in the slide groove (404). The output end of the motor (501) is connected to a planetary reducer (502). A drive shaft (503) is fixedly installed on the output end of the planetary reducer (502). A drive frame (504) is fixedly installed at the end of the drive shaft (503). A wedge block (505) is fixedly installed at one end of the drive shaft (503), and a counterweight block (509) is fixedly installed at the other end of the drive shaft (503).

6. The post-grouting and pressurization device for bored cast-in-place piles according to claim 5, characterized in that: A through hole is provided in the middle of the partition (402), and the output end of the motor (501) passes through the partition (402) through the through hole.

7. The post-grouting and pressurization device for bored cast-in-place piles according to claim 6, characterized in that: The impact block (506) is movably installed in the positioning sleeve (403) via the sliding support (507). One end of the energy storage spring (508) is connected to the impact block (506), and the other end of the energy storage spring (508) is connected to the top plate of the positioning sleeve (403). The drive shaft (503) is rotatably installed below the partition plate (402) via the drive shaft (503). The wedge block (505) is rotatably installed on both sides of the sliding support (507) via the drive frame (504).

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