CN221855618U - A kind of karst cave pile foundation repair structure - Google Patents

Abstract

The present invention discloses a karst cave pile foundation repair structure, which comprises a flexible drill pipe, a drill rod and a drill bit, wherein the drill bit is fixedly mounted on the drill rod, the drill rod is rotatably mounted on the flexible drill pipe, and a driving assembly is installed in the drill rod for driving the drill rod to rotate on the flexible drill pipe with the drill rod and the flexible drill pipe as the center. The present invention has the effect of reducing the damage to the pile body structure when filling the karst cave at the bottom of the pile foundation.

Description

A kind of karst cave pile foundation repair structure

Technical Field

The invention relates to the field of engineering construction, in particular to a karst cave pile foundation repair structure.

Background Art

In construction and civil engineering, pile foundation is a common form of foundation. Pile foundation is formed by one or more piles, which are connected at the top to form a stable support structure to support the building or other structure above. The design and construction of pile foundation need to take into account geological conditions, the weight and size of the building, and natural factors such as earthquakes. However, in the actual construction process, defects sometimes occur at the bottom of the pile foundation, such as unstable soil layer at the bottom of the pile, insufficient bearing capacity at the bottom of the pile, etc. These defects may affect the stability and safety of the pile foundation.

The traditional solution is to drill a hole from the pile body down to the bearing layer at the bottom of the pile for treatment; this method requires the use of vertical drilling rods to remove the defective soil layer through the drilling rods, and then fill it with stable materials to enhance the bearing capacity of the pile bottom; however, this traditional method has some disadvantages; first, since it is necessary to drill a hole at the pile body, this may destroy the integrity of the pile foundation and affect its stability; second, this method may affect adjacent pile foundations or buildings, especially in dense urban environments. Therefore, a new device is needed to treat the defects at the bottom of the pile without damaging the pile body to solve the above problems.

Summary of the invention

In order to reduce damage to the pile body structure when filling the karst cave at the bottom of the pile foundation, the present application provides a karst cave pile foundation repair structure.

The present application provides a karst cave pile foundation repair structure that adopts the following technical solution:

A karst cave pile foundation repair structure comprises a flexible drill pipe, a drill rod and a drill bit, wherein the drill bit is rotatably mounted on the drill rod, and the drill rod is rotatably mounted on the flexible drill pipe. A driving assembly is installed in the drill rod for driving the drill rod to rotate on the flexible drill pipe with the connection between the drill rod and the flexible drill pipe as the center.

By adopting the above technical solution, because the flexible drill pipe has greater rigidity in the axial direction and certain flexibility in the radial direction, the construction workers can drill holes in the soil layer by pushing the flexible drill pipe forward after the drill bit rotates. When the drill bit stops drilling, the drive assembly drives the drill rod to rotate on the flexible drill pipe to adjust the forward angle of the drill rod; finally, a pipeline path for filling and slurry delivery to the cave is drilled in the soil layer, thereby reducing damage to the pile foundation structure when repairing the cave.

Preferably, the driving assembly includes a universal ball bearing and a connecting rod, the universal ball bearing is fixedly mounted on the pipe mouth of the flexible drill pipe, the connecting rod is passed through the universal ball of the universal ball bearing and the two ends of the connecting rod are respectively located on both sides of the universal ball bearing, one end of the connecting rod away from the flexible drill pipe is used to connect the drill rod, and a first driving member for driving the connecting rod to move is installed in the flexible drill pipe.

By adopting the above technical solution, the first driving member is used to drive one end of the connecting rod located in the drill pipe to rotate so that the connecting rod moves in any direction under the action of the universal ball bearing, thereby changing the forward direction of the drill rod.

Preferably, the first driving member comprises a plurality of cylinders, each of which is fixedly mounted on the inner tube wall of the flexible drill tube and spaced circumferentially along the inner tube wall, and the piston rod of the cylinder is connected to the outer side wall of the connecting rod.

By adopting the above technical solution, a plurality of cylinders are used to jointly push the connecting rod so that the connecting rod moves. This driving method can accurately control the position and direction of the drill rod through the cylinder, thereby improving the accuracy and reliability of the work.

Preferably, the driving assembly includes an eccentric shaft, the eccentric shaft includes a central axis portion and an eccentric portion which are connected to each other, the central axis portion is rotatably mounted on one end of the flexible drill pipe, the eccentric portion is fixedly connected to the drill rod, and the cave pile foundation repair structure also includes a second driving member for driving the eccentric shaft to rotate.

By adopting the above technical solution, the second driving member is used to drive the eccentric shaft to rotate, so that the drill rod can deviate from the center line within a certain range for operation, thereby increasing the flexibility of drilling, and the position and direction of the drilling can be adjusted according to work needs, so that defects in the pile foundation can be repaired more accurately, thereby improving the quality and effect of the repair.

Preferably, the second driving member comprises a motor, the motor is fixedly installed in the flexible drill pipe, and the output end of the motor is connected to the central axis.

By adopting the above technical solution, the motor as a driving source can provide stable and continuous power to ensure the continuous rotation of the eccentric shaft.

Preferably, a slurry delivery pipe is sleeved on the flexible drill pipe, and a fixing member for fixing the slurry delivery pipe on the flexible drill pipe is installed on the flexible drill pipe.

By adopting the above technical solution, the grouting pipe is fixed to the flexible drill pipe using fixings and enters the soil layer together with the flexible drill pipe. After drilling out the predetermined grouting path, the flexible drill pipe and the drill pipe are recovered, and grouting is directly performed in the grouting pipe to fill the cave, thereby speeding up the construction speed.

Preferably, the fixing member includes a fixing rod, which is rotatably mounted on the flexible drill pipe and rotates within an axial plane of the flexible drill pipe. The fixing rod is perpendicular to the flexible drill pipe, and one end of the fixing rod away from the flexible drill pipe is passed through the slurry pipe. When the drill pipe completes drilling and begins to be pulled out, the fixing rod rotates in a direction away from the drill pipe.

By adopting the above technical solution, the fixing rod can fix the grouting pipe on the drill pipe, ensuring the stability of the grouting pipe and avoiding the movement or vibration of the grouting pipe during the drilling process. At the same time, after the drilling is completed, the construction personnel will pull the flexible drill pipe and drill rod out of the soil layer, and the fixing rod will be rotated and no longer penetrated into the grouting pipe, so that the grouting pipe will be left in the soil layer to start grouting to fill the cave.

Preferably, the cross-sectional area of the drill bit is larger than the cross-sectional area of the slurry delivery pipe.

By adopting the above technical solution, the hole drilled by the drill bit is larger than the cross-sectional area of the grouting pipe, so that the grouting pipe can advance in the hole along with the flexible drill pipe and is less likely to be scratched and damaged by the narrow hole wall, thereby ensuring sufficient injection of slurry and improving the quality of pile foundation repair.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Because the flexible drill pipe has greater rigidity in the axial direction and certain flexibility in the radial direction, the construction personnel can drill holes in the soil layer by pushing the flexible drill pipe forward after the drill bit rotates. When the drill bit stops drilling, the driving assembly drives the drill rod to rotate on the flexible drill pipe to adjust the forward angle of the drill rod; finally, a pipeline path for filling and conveying slurry to the cave is drilled in the soil layer, thereby reducing the damage to the pile foundation structure when repairing the cave;

2. Using the first driving member to drive one end of the connecting rod located in the drill pipe to rotate so that the connecting rod moves in any direction under the action of the universal ball bearing, thereby changing the forward direction of the drill pipe;

3. Use the second drive member to drive the eccentric shaft to rotate, so that the drill rod can deviate from the center line within a certain range to operate, increasing the flexibility of drilling. The position and direction of the drilling can be adjusted according to work needs, and the defects of the pile foundation can be repaired more accurately, thereby improving the quality and effect of the repair.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of the overall structure of a karst cave pile foundation repair structure according to Example 1 of the present application.

Figure 2 is a cross-sectional view of the overall structure of a karst cave pile foundation repair structure according to Example 2 of the present application.

Description of reference numerals:

1. Flexible drill pipe; 11. Fixed rod; 2. Drill rod; 3. Drill bit; 4. Drive assembly; 41. Universal ball bearing; 42. Connecting rod; 43. First drive member; 44. Eccentric shaft; 441. Middle shaft; 442. Eccentric part; 45. Second drive member; 5. Slurry delivery pipe.

DETAILED DESCRIPTION

The present application is further described in detail below in conjunction with Figures 1-2.

Example 1

The embodiment of the present application discloses a karst cave pile foundation repair structure. Referring to Figure 1, the karst cave pile foundation repair structure includes a flexible drill pipe 1, a drill rod 2 and a drill bit 3, the drill bit 3 is rotatably mounted on the drill rod 2, a driving motor for driving the drill bit 3 to rotate is installed in the drill rod 2, the drill rod 2 is rotatably mounted on the flexible drill pipe 1, a driving assembly 4 for driving the drill rod 2 to rotate on the flexible drill pipe 1 with the connection between the drill rod 2 and the flexible drill pipe 1 as the center is installed in the drill rod 2, a grouting hole is drilled from the soil layer on one side of the existing pile foundation using the flexible drill pipe 1 and the drill rod 2, and the driving assembly 4 is used to adjust the direction of the drill rod 2 in the soil layer so that the structure moves in a predetermined direction, and a curved grouting hole is drilled in the soil layer, which can effectively reduce the damage to the pile foundation compared to drilling a grouting pipe in the existing pile foundation.

In this embodiment, the driving assembly 4 includes a universal ball bearing 41 and a connecting rod 42. The base of the universal ball bearing 41 is fixedly installed on the pipe mouth of the flexible drill pipe 1. The connecting rod 42 is inserted into the universal ball of the universal ball bearing 41, and one end of the connecting rod 42 is located inside the flexible drill pipe 1 and the other end is located outside the flexible drill pipe 1. The end of the connecting rod 42 located outside the flexible drill pipe 1 is used to connect the drill pipe 2. A first driving member 43 for driving the connecting rod 42 to move is installed in the flexible drill pipe 1; the first driving member 43 includes a plurality of cylinders, each of which is fixedly installed on the inner pipe wall of the flexible drill pipe 1 and is arranged at intervals along the circumferential direction of the inner pipe wall. The piston rod of the cylinder is connected to the outer wall of the connecting rod 42, and the cylinder pushes one end of the connecting rod 42 in the flexible drill pipe 1, so that the drill pipe 2 moves under the action of the universal ball bearing 41.

A slurry delivery pipe 5 is sleeved on the flexible drill pipe 1, and the maximum cross-sectional area of the drill bit 3 is larger than the cross-sectional area of the slurry delivery pipe 5. When drilling a slurry delivery hole, the slurry delivery pipe 5 is directly brought to the bottom of the hole; a fixing device for fixing the slurry delivery pipe 5 on the flexible drill pipe 1 is installed on the flexible drill pipe 1; the fixing device includes a fixing rod 11, which is rotatably installed on the flexible drill pipe 1 and rotates in the axial plane of the flexible drill pipe 1, the fixing rod 11 is perpendicular to the flexible drill pipe 2, and the end of the fixing rod 11 away from the flexible drill pipe 1 is penetrated by the slurry delivery pipe 5, and when the drill pipe 2 completes drilling and begins to be pulled out, the fixing rod 11 rotates in a direction away from the drill pipe 2, so that it is no longer connected to the slurry delivery pipe 5.

The implementation principle of a karst pile foundation repair structure in Example 1 of the present application is as follows: when a detection instrument is used to detect the presence of a karst cave at the bottom of the pile foundation, the grouting pipe 5 is put on the flexible drill pipe 1 and fixed with the fixing rod 11, the drill bit 3 is turned on to drill a hole in the soil layer, and the flexible drill pipe 1 is used to advance at the same time. When the direction needs to be adjusted, the cylinder is used to push the connecting rod 42 to change the forward direction of the drill rod 2, until the drill bit 3 drills a hole directly leading to the karst cave. At this time, the flexible drill pipe 1 is pulled out, leaving the grouting pipe 5, and the construction personnel directly grout into the grouting pipe 5 to fill the karst cave.

Embodiment 2,

2 , Example 2 of the present application differs from Example 1 in that the drive assembly 4 includes an eccentric shaft 44, the eccentric shaft 44 includes a central axis portion 441 and an eccentric portion 442 that are interconnected, the central axis portion 441 is rotatably mounted on one end of the flexible drill pipe 1 close to the drill rod 2, the eccentric portion 442 is fixedly connected to the drill rod 2, and the karst cave pile foundation repair structure also includes a second drive member 45 for driving the eccentric shaft 44 to rotate; the second drive member 45 includes a motor, the motor is fixedly mounted in the flexible drill pipe 1, and the output end of the motor is connected to the central axis portion 441.

The implementation principle of a karst pile foundation repair structure in Example 2 of the present application is: when the direction needs to be adjusted, stop the drill bit 3, start the motor, drive the eccentric shaft 44 to rotate, thereby changing the direction of the drill rod 2, and after rotating to an appropriate angle, stop the motor and continue to start the drill bit 3, so as to continue to drill slurry delivery holes in the soil layer.

The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims (8)

1. A karst cave pile foundation repair structure, characterized in that it comprises a flexible drill pipe (1), a drill rod (2) and a drill bit (3), wherein the drill bit (3) is rotatably mounted on the drill rod (2), the drill rod (2) is rotatably mounted on the flexible drill pipe (1), and a driving component (4) is installed in the drill rod (2) for driving the drill rod (2) to rotate on the flexible drill pipe (1) with the connection between the drill rod (2) and the flexible drill pipe (1) as the center. 2. A karst cave pile foundation repair structure according to claim 1, characterized in that the driving assembly (4) comprises a universal ball bearing (41) and a connecting rod (42), the universal ball bearing (41) is fixedly mounted on the pipe mouth of the flexible drill pipe (1), the connecting rod (42) is passed through the universal ball of the universal ball bearing (41) and the two ends of the connecting rod (42) are respectively located on both sides of the universal ball bearing (41), one end of the connecting rod (42) away from the flexible drill pipe (1) is used to connect the drill pipe (2), and a first driving member (43) for driving the connecting rod (42) to move is installed in the flexible drill pipe (1). 3. A karst cave pile foundation repair structure according to claim 2, characterized in that the first driving member (43) includes a plurality of cylinders, each of which is fixedly mounted on the inner tube wall of the flexible drill pipe (1) and is circumferentially spaced along the inner tube wall, and the piston rod of each of the cylinders is connected to the outer wall of the connecting rod (42). 4. A karst cave pile foundation repair structure according to claim 1, characterized in that the driving assembly (4) includes an eccentric shaft (44), the eccentric shaft (44) includes a central axis portion (441) and an eccentric portion (442) connected to each other, the central axis portion (441) is rotatably mounted on one end of the flexible drill pipe (1), and the eccentric portion (442) is fixedly connected to the drill rod (2), and the karst cave pile foundation repair structure also includes a second driving member (45) for driving the eccentric shaft (44) to rotate. 5. A karst cave pile foundation repair structure according to claim 4, characterized in that the second driving member (45) comprises a motor, the motor is fixedly installed in the flexible drill pipe (1), and the output end of the motor is connected to the central axis (441). 6. A karst cave pile foundation repair structure according to claim 1, characterized in that a grouting pipe (5) is sleeved on the flexible drill pipe (1), and a fixing part for fixing the grouting pipe (5) on the flexible drill pipe (1) is installed on the flexible drill pipe (1). 7. A karst cave pile foundation repair structure according to claim 6, characterized in that the fixing part includes a fixing rod (11), the fixing rod (11) is rotatably mounted on the flexible drill pipe (1) and rotates in the axial plane of the flexible drill pipe (1), the fixing rod (11) is perpendicular to the flexible drill pipe (1), and one end of the fixing rod (11) away from the flexible drill pipe (1) is passed through the slurry pipe (5), and when the drill rod (2) completes drilling and begins to be pulled out, the fixing rod (11) rotates in a direction away from the drill rod (2). 8. A karst cave pile foundation repair structure according to claim 6, characterized in that the maximum cross-sectional area of the drill bit (3) is greater than the cross-sectional area of the slurry delivery pipe (5).