A guiding device for MJS method pile construction

Abstract

The application discloses a guide device for MJS method pile construction, which comprises a centering connecting pipe and a guide sliding sleeve, drill pipe and drill body pipe are detachably arranged at two ends of the centering connecting pipe to form a straight linear drill pipe body, an inclined surface is arranged at the end of the guide sliding sleeve, the guide sliding sleeve is arranged on the surface of the centering connecting pipe, an annular groove is formed in the inner wall of the guide sliding sleeve, a positioning ring is rotatably arranged in the annular groove, and a guide sliding block is fixedly arranged on the inner wall of the positioning ring. The guide sliding sleeve is arranged on the surface of the drill pipe body, the guide sliding sleeve is submerged into the underground soil layer together with the drill pipe body during the drilling process, the guide sliding sleeve is rotated, the direction of the inclined surface is changed, the inclined surface is provided with a lifting resistance by using the sludge, the direction of the drill pipe is corrected through the resistance, and the effect of preventing deviation is achieved. The method has the advantages of simple structure, easy control, manual intervention condition for horizontal and inclined deep hole pile construction, and improved pile construction quality.

Description

Technical Field

[0001] This invention relates to the field of MJS method construction technology, and in particular to a guiding device for MJS method pile construction. Background Technology

[0002] The MJS method is a construction method capable of horizontal and 360° all-around foundation reinforcement. It has minimal impact on the surrounding environment and foundation disturbance, enabling deep foundation reinforcement and underwater construction. It also allows for the selection of sludge removal sites. Existing technologies, such as patent application number 201910472260.1, disclose a pile-forming method for hard strata using the MJS method, which includes pile location measurement and marking; determining the pile core position using a measuring instrument based on the preset pile location; and pre-drilling. The process involves several steps: First, a pre-drilling machine is used to remove local obstacles. Then, the MJS piling machine is positioned and debugged, and its drilling, slag removal, and grouting parameters are set according to geological conditions. Next, the borehole is formed by connecting the multi-hole pipe, drill rod, and drill bit, and the MJS piling machine pushes the multi-hole pipe into the soil. Finally, after borehole formation, grouting is initiated, injecting hardened material from the drill rod nozzle to form a solidified structure. The multi-hole pipe is then withdrawn. This invention employs different strategies for borehole and pile formation under varying geological conditions, achieving rapid rock-breaking drilling and improving the efficiency of both processes.

[0003] The MJS method can be used for construction in horizontal, inclined, and vertical directions at any angle. However, in practical applications, when the pile length is relatively long, especially in horizontal and inclined piles, the drill rod becomes longer and longer. The accuracy of drilling into the ground relies solely on the rigidity of the drill rod and the guidance control of the pile driver, which can easily lead to drilling deviation. Since there is no suitable underground guiding mechanism to correct the direction of the drill rod, the quality of pile formation is difficult to guarantee, causing many inconveniences to the construction. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a guiding device for MJS method pile construction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A guiding device for MJS method pile construction includes a centering connecting pipe and a guide sleeve. The two ends of the centering connecting pipe are respectively detachably installed with a drill bit pipe and a drill body pipe. The centering connecting pipe, the drill bit pipe and the drill body pipe are assembled together to form a straight drill rod body.

[0007] The end of the guide sleeve is provided with an inclined surface. The guide sleeve is sleeved on the surface of the centering connecting tube. An annular groove is opened on the inner wall of the guide sleeve. A positioning ring is rotatably connected in the annular groove. A guide slider is fixedly installed on the inner wall of the positioning ring. A guide groove is opened on the surface of the centering connecting tube. The positioning ring is sleeved on the surface of the centering connecting tube, so that the guide slider slides along the inner wall of the guide groove.

[0008] The inner wall of the guide sleeve is provided with a snap-fit ​​groove, and the surface of the centering connecting pipe is rotatably connected with a snap-fit ​​plate. The inside of the centering connecting pipe is provided with a liquid injection channel. Pressurized fluid is delivered through the liquid injection channel to push open the snap-fit ​​plate, so that the snap-fit ​​plate extends into the snap-fit ​​groove.

[0009] Preferably, the surface of the drill bit tube is provided with a mud discharge port, a grouting port, an air nozzle, and a jet nozzle, and the interior of the drill rod body is provided with a mud conveying hole, an air conveying hole, a grouting conveying hole, and a water conveying hole. The mud conveying hole is connected to the mud discharge port, the air conveying hole is connected to the air nozzle, the water conveying hole is connected to the jet nozzle, and the grouting conveying hole is connected to the grouting port.

[0010] Preferably, the mud delivery hole, air delivery hole, grout delivery hole, and water delivery hole pass through both ends of the centering connecting pipe, and a through hole communicating with the injection channel is opened inside the drill rod body.

[0011] Preferably, the outer wall of the centering connecting pipe is provided with a sinking groove, the snap-fit ​​plate is rotatably installed in the sinking groove, the inner wall of the sinking groove is provided with a sliding cavity communicating with the injection channel, a movable plunger is slidably installed in the sliding cavity, the end of the movable plunger is rotatably connected to a transmission rod, and the end of the transmission rod away from the movable plunger is rotatably connected to the lower surface of the snap-fit ​​plate.

[0012] Preferably, a plurality of spiral ribs are fixedly installed on the surface of the guide sleeve, and the plurality of spiral ribs are arranged in a circumferential array on the surface of the guide sleeve, and the end surface of the guide sleeve near the inclined surface is provided with an expansion structure.

[0013] Preferably, the drill tube has a multi-section structure, with multiple drill tubes interlocked and fixed together by bolts, and the centering connecting tube, drill bit tube and drill tube are assembled and fixed together by bolts.

[0014] The present invention has the following beneficial effects:

[0015] 1. This guiding device features a guide sleeve on the surface of the drill rod body. During drilling, the guide sleeve is submerged into the underground soil along with the drill rod. By rotating, the guide sleeve changes the orientation of the inclined surface, and the mud provides a lifting resistance to the inclined surface. This resistance corrects the direction of the drill rod's advance, thus preventing deviation. This method has a simple structure and is easy to control, providing conditions for manual intervention in the construction of horizontal and inclined deep-hole piles, thereby improving the quality of pile formation.

[0016] 2. This guiding device, by setting a hydraulically driven snap-fit ​​plate, snaps into the snap-fit ​​groove, so that the guide sleeve can rotate with the drill pipe body, thereby achieving the effect of adjusting the rotation angle of the guide sleeve underground, and facilitating the use of the drill pipe to push the guide sleeve, so that the guide sleeve can be submerged underground, achieving the effect of underground guidance.

[0017] By setting a positioning ring and a guide slider, the guide sleeve and the centering connecting pipe are connected in a sliding and rotating manner. The guide sleeve is submerged underground, supporting the drill rod body to maintain an accurate rotation direction, thereby achieving the effect of controlling the drilling direction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the guiding device proposed in this invention (with the snap-fit ​​plate in its retracted state);

[0019] Figure 2 This is a cross-sectional view of the guiding device proposed in this invention (with the snap-fit ​​plate in its unfolded state);

[0020] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the diagram.

[0021] Figure 4 This is a schematic diagram of the cross-section of the centering connecting pipe proposed in this invention;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the guide sleeve proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the force applied to the guiding device proposed in this invention.

[0024] In the diagram: 1. Centering connecting pipe, 2. Guide sleeve, 3. Drill bit pipe, 4. Guide slider, 5. Drill body pipe, 6. Inclined surface, 7. Positioning ring, 8. Guide groove, 9. Clip groove, 10. Clip plate, 11. Injection channel, 12. Mud discharge port, 13. Grouting port, 14. Air nozzle, 16. Jet nozzle, 17. Mud conveying hole, 18. Air conveying hole, 19. Grouting conveying hole, 20. Water conveying hole, 21. Movable plunger, 22. Transmission rod, 23. Spiral reinforcement bar, 24. Mud and slag, 25. Underground soil layer. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Reference Figure 1-6 A guiding device for MJS method pile construction includes a centering connecting pipe 1 and a guide sleeve 2. Drill bit pipe 3 and drill body pipe 5 are detachably installed at both ends of the centering connecting pipe 1. The centering connecting pipe 1, drill bit pipe 3 and drill body pipe 5 are assembled together to form a straight drill rod body.

[0028] The drill bit tube 3 has a mud discharge port 12, a grouting port 13, an air nozzle 14, and a jet nozzle 16 on its surface. The drill rod body has a mud conveying hole 17, an air conveying hole 18, a grouting conveying hole 19, and a water conveying hole 20 inside. The mud conveying hole 17 is connected to the mud discharge port 12, the air conveying hole 18 is connected to the air nozzle 14, the water conveying hole 20 is connected to the jet nozzle 16, and the grouting conveying hole 19 is connected to the grouting port 13.

[0029] The drill pipe 5 has a multi-section structure, with multiple drill pipes 5 interlocked and fixed together by bolts. The mud delivery hole 17, air delivery hole 18, grouting delivery hole 19 and water delivery hole 20 pass through both ends of the centering connecting pipe 1. The centering connecting pipe 1, drill bit pipe 3 and drill pipe 5 are assembled and fixed together by bolts.

[0030] The MJS method for pile construction involves installing the drill rod body on an MJS jet drilling rig. The drill rod body rotates and advances forward, drilling into the ground. The MJS jet drilling rig injects high-pressure water and air into the drill rod body, which are ejected from the air nozzle 14 and jet nozzle 16, respectively, cutting the soil to form a pile hole. The generated mud enters the mud conveying hole 17 from the mud discharge port 12 and is discharged. After the drill rod reaches the design elevation or depth (nose area), concrete mortar is conveyed from the grouting conveying hole 19, and grouting begins at the grouting port 13 to form an underground pile. The above construction process is a mature existing technology and will not be elaborated here.

[0031] In this embodiment, the guide sleeve 2 is sleeved on the surface of the centering connecting pipe 1. The end of the guide sleeve 2 is provided with an inclined surface 6. The inner wall of the guide sleeve 2 is provided with an annular groove. A positioning ring 7 is rotatably connected in the annular groove. A guide slider 4 is fixedly installed on the inner wall of the positioning ring 7. A guide groove 8 is provided on the surface of the centering connecting pipe 1. The positioning ring 7 is sleeved on the surface of the centering connecting pipe 1, so that the guide slider 4 slides along the inner wall of the guide groove 8.

[0032] By setting the positioning ring 7 and the guide slider 4, the guide sleeve 2 and the centering connecting pipe 1 are connected to slide and rotate. The guide sleeve 2 is submerged underground, supporting the drill rod body to maintain an accurate rotation direction, thereby achieving the effect of controlling the drilling direction.

[0033] The inner wall of the guide sleeve 2 is provided with a snap-fit ​​groove 9, the surface of the centering connecting pipe 1 is rotatably connected with a snap-fit ​​plate 10, the inside of the centering connecting pipe 1 is provided with a liquid injection channel 11, the inside of the drill rod body is provided with a through hole communicating with the liquid injection channel 11, and pressurized fluid is delivered to the liquid injection channel 11 through the through hole, which pushes open the snap-fit ​​plate 10 so that the snap-fit ​​plate 10 extends into the snap-fit ​​groove 9.

[0034] Specifically, a recessed groove is provided on the outer wall of the centering connecting pipe 1, and the snap-fit ​​plate 10 is rotatably installed in the recessed groove. A sliding cavity communicating with the injection channel 11 is provided on the inner wall of the recessed groove. A movable plunger 21 is slidably installed in the sliding cavity. A transmission rod 22 is rotatably connected to the end of the movable plunger 21. The end of the transmission rod 22 away from the movable plunger 21 is rotatably connected to the lower surface of the snap-fit ​​plate 10. The pressurized fluid pushes the movable plunger 21 to move, which can also make the snap-fit ​​plate 10 flip and extend into the snap-fit ​​groove 9. By drawing the injection channel 11, a negative pressure is formed, so that the snap-fit ​​plate 10 is housed in the recessed groove on the outer wall of the centering connecting pipe 1.

[0035] By setting a hydraulically driven snap-fit ​​plate 10, the snap-fit ​​plate 10 snaps into the snap-fit ​​groove 9, so that the guide sleeve 2 can rotate with the drill pipe body, thereby achieving the effect of adjusting the rotation angle of the guide sleeve 2 underground, and facilitating the use of the drill pipe to push the guide sleeve 2, so that the guide sleeve 2 can be submerged underground to achieve the effect of underground guidance.

[0036] In this embodiment, a plurality of spiral ribs 23 are fixedly installed on the surface of the guide sleeve 2. The plurality of spiral ribs 23 are arranged in a circumferential array on the surface of the guide sleeve 2. The end surface of the guide sleeve 2 near the inclined surface 6 is provided with an expansion structure, which increases the area of ​​the inclined surface 6.

[0037] The specific operating method of this guiding device, including its underground guiding mechanism, is as follows: Figure 1 Under normal conditions, the drill pipe body is drilled into the ground, and the guide sleeve 2 is also pushed into the ground. The drill pipe body can reciprocate, extend, and rotate to achieve jet grouting and slag removal. When the guide sleeve 2 is pushed forward, as... Figure 2 As shown, the snap-fit ​​plate 10 extends into the snap-fit ​​groove 9, allowing the guide sleeve 2 to rotate and advance together with the drill pipe body. When it is necessary to adjust the drilling direction, the guide sleeve 2 is rotated to a certain angle, such as... Figure 6 As shown, the drill pipe body stops rotating and propels the drill pipe body and guide sleeve 2 forward. The mud 24 provides a lifting resistance to the inclined surface 6, and the drill pipe jacking direction is corrected by this resistance.

[0038] It should be noted that, a) during the construction process, once the slag discharge is stopped, mud and slag will accumulate in the pile hole, which will prepare for the guidance control.

[0039] b. When the drill pipe body and guide sleeve 2 are pushed forward, not only can the snap-fit ​​plate 10 be adjusted as follows: Figure 6 The indicated posture, stopping rotation and advancing forward, can also cause the snap-fit ​​plate 10 to move as shown. Figure 1 As shown in the posture, the main body of the rotating rod rotates to cut the hole and moves forward. This can be selected according to actual needs.

[0040] c. The guide sleeve 2 rotates with the drill pipe body, which can change the orientation of the inclined surface 6, and the direction of the lifting resistance also changes accordingly, so as to correct the drilling angle in different directions.

[0041] A guide sleeve 2 is installed on the surface of the drill rod body. During the drilling process, the guide sleeve 2 is submerged into the underground soil layer 25 along with the drill rod. By rotating the guide sleeve 2, the orientation of the inclined surface 6 is changed. The mud slag 24 provides a lifting resistance to the inclined surface 6. This resistance corrects the direction of the drill rod's advance, thereby achieving the effect of preventing deviation. This method has a simple structure and is easy to control. It provides conditions for artificial intervention in the construction of horizontal and inclined deep hole piles, and improves the quality of pile formation.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A guiding device for MJS method pile construction, comprising a centering connecting pipe (1) and a guide sleeve (2), characterized in that: The centering connecting pipe (1) is detachably equipped with a drill bit pipe (3) and a drill body pipe (5) at both ends. The centering connecting pipe (1), the drill bit pipe (3) and the drill body pipe (5) are assembled together to form a straight drill rod body. The guide sleeve (2) has an inclined surface (6) at its end. The guide sleeve (2) is fitted onto the surface of the centering connecting pipe (1). The inner wall of the guide sleeve (2) has an annular groove. A positioning ring (7) is rotatably connected in the annular groove. A guide slider (4) is fixedly installed on the inner wall of the positioning ring (7). The surface of the centering connecting pipe (1) has a guide groove (8). The positioning ring (7) is fitted onto the surface of the centering connecting pipe (1), so that the guide slider (4) slides along the inner wall of the guide groove (8). By setting the positioning ring (7) and the guide slider (4), the sliding and rotating connection between the guide sleeve (2) and the centering connecting pipe (1) is realized. The inner wall of the guide sleeve (2) is provided with a snap-fit ​​groove (9), and the surface of the centering connecting pipe (1) is rotatably connected with a snap-fit ​​plate (10). The inside of the centering connecting pipe (1) is provided with an injection channel (11). Pressurized fluid is delivered through the injection channel (11) to push open the snap-fit ​​plate (10) so that the snap-fit ​​plate (10) extends into the snap-fit ​​groove (9).

2. The guiding device for MJS method pile construction according to claim 1, characterized in that: The surface of the drill bit tube (3) is provided with a mud discharge port (12), a grouting port (13), an air nozzle (14) and a jet nozzle (16). The inside of the drill rod body is provided with a mud conveying hole (17), an air conveying hole (18), a grouting conveying hole (19) and a water conveying hole (20). The mud conveying hole (17) is connected to the mud discharge port (12), the air conveying hole (18) is connected to the air nozzle (14), the water conveying hole (20) is connected to the jet nozzle (16), and the grouting conveying hole (19) is connected to the grouting port (13).

3. A guiding device for MJS method pile construction according to claim 2, characterized in that: The mud delivery hole (17), air delivery hole (18), grout delivery hole (19) and water delivery hole (20) pass through both ends of the centering connecting pipe (1), and a through hole communicating with the injection channel (11) is opened inside the drill rod body.

4. A guiding device for MJS method pile construction according to any one of claims 1-3, characterized in that: The outer wall of the centering connecting pipe (1) is provided with a sinking groove, and the snap-fit ​​plate (10) is rotatably installed in the sinking groove. The inner wall of the sinking groove is provided with a sliding cavity communicating with the injection channel (11). A movable plunger (21) is slidably installed in the sliding cavity. A transmission rod (22) is rotatably connected to the end of the movable plunger (21). The end of the transmission rod (22) away from the movable plunger (21) is rotatably connected to the lower surface of the snap-fit ​​plate (10).

5. A guiding device for MJS method pile construction according to claim 4, characterized in that: Multiple spiral ribs (23) are fixedly installed on the surface of the guide sleeve (2). The multiple spiral ribs (23) are arranged in a circumferential array on the surface of the guide sleeve (2). The end surface of the guide sleeve (2) near the inclined surface (6) is provided with an expansion structure.

6. A guiding device for MJS method pile construction according to claim 5, characterized in that: The drill pipe (5) is a multi-section structure, with multiple drill pipes (5) connected together by bolts. The centering connecting pipe (1), the drill bit pipe (3) and the drill pipe (5) are assembled and fixed together by bolts.

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