A foundation pit foundation treatment process and a rotary drilling machine suitable for the process

Abstract

The present application discloses a foundation pit ground treatment process and a rotary drilling machine suitable for the process, which relates to the field of foundation construction technology, including the following steps: S1, pile position measurement and layout; S2, casing burial and hole guiding; S3, hole making; S4, hole cleaning: after the rotary drilling machine finishes hole making, a gravel pile machine equipped with a vibrator is used to clean the hole, and the vibrator is continuously lifted and lowered until the mud coming out of the hole mouth becomes thinner. S5, pile making: by continuously filling the hole, the density of the filling in the casing is controlled. When a certain density is reached, the filling is stopped and the casing is pulled out; S6, quality inspection and acceptance. The present application makes the foundation pit foundation less likely to collapse by using a specific rotary drilling machine and by replacing the cutter head.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation construction, in particular to a foundation pit foundation treatment process and a rotary drilling machine suitable for the process. Background Art

[0002] From top to bottom, the riverbed of the hydropower station dam foundation is distributed with modern river alluvial deposits composed of sand, gravel and boulders, barrier lake phase sediments composed of silt, clay, sandy silt and silty sand, and lens-shaped river alluvial deposits mixed with landslide deposits on both sides of the river and Lawa ditch alluvial deposits.

[0003] During the construction process, the foundation will undergo varying degrees of settlement. The general practice is to use a vibrator to drill holes in the ground and place piles into the holes to increase the bearing capacity of the foundation and reduce the amount of settlement.

[0004] However, during the construction process, there are a lot of boulders, boulders, gravels, etc., which are difficult to penetrate even with a high-power vibrator, and hole collapse often occurs. Summary of the Invention

[0005] In order to improve the problem that the vibrator is easily affected by the adverse effects of hard sand and gravel during foundation construction and the hole collapse is likely to occur during the drilling process, the present application provides a foundation pit foundation treatment process and a rotary drilling rig suitable for the process.

[0006] On the one hand, the present application provides a foundation pit foundation treatment process:

[0007] The foundation pit foundation treatment process provided in this application adopts the following technical solutions:

[0008] A foundation pit foundation treatment process comprises the following steps:

[0009] S1. Pile position measurement and setting out;

[0010] S2. Casing burial and pilot hole: Use a rotary drilling machine to drill a pilot hole at the construction site, use a vibratory hammer to bury the casing in the pilot hole and then backfill, and use the rotary drilling machine to initially pilot the hole. When encountering isolated rocks and other sand and gravel that are difficult to penetrate, use a pick barrel to drill the pilot hole;

[0011] S3. Hole making: Use a rotary drilling machine to make further holes. After the lead hole passes through the backfill layer, lower the vibrator to 30 cm from the bottom of the lead hole section. Turn on the water supply pump and air compressor. After the water and air at the lower end of the vibrator are out of normal, start the vibrator. Clean the mud residue at the hole mouth at any time during the hole making process.

[0012] S4. Hole cleaning: After the rotary drilling machine finishes drilling, a stone pile driver equipped with a vibrator is used to clean the hole. The vibrator is continuously lifted and lowered until the mud coming out of the hole becomes thinner.

[0013] S5. Pile making: Control the density of the filling material in the casing by continuously filling the hole. When a certain density is reached, stop filling and pull out the casing.

[0014] S6. Quality inspection and acceptance.

[0015] By adopting the above technical solution, when encountering strata that are difficult to penetrate, such as boulders, the pick barrel is replaced to drill the hole, which increases the drilling speed. After the boulders are drilled through, the rotary drilling rig can be continued to work, making it less likely for collapse to occur during foundation construction.

[0016] Optionally, during the pile making process, the filler is mainly fed continuously, supplemented by interval feeding, so that the vibrator can penetrate to the original depth before lifting.

[0017] By adopting the above technical solution, the occurrence of vibration leakage is reduced.

[0018] On the other hand, the present application provides a rotary drilling machine,

[0019] The rotary drilling machine provided in this application adopts the following technical solution:

[0020] A rotary drilling rig comprises a slewing mechanism, a moving crawler and a boom, the moving crawler is movably connected to an organic body, a mast is fixed to the front end of the running body, a main winch is fixed above the mast, the main winch sleeve is provided with a wire rope for lifting the boom, the boom is connected to a drilling tool, the boom is connected to a positioning assembly, the positioning assembly is connected to the mast, the positioning assembly includes a positioning platform, the positioning platform is used to be sleeved on the outside of the boom, the positioning platform is provided with a positioning hole through which the boom passes, the positioning platform is provided with a locking device, the locking device is used to lock the boom and the positioning platform.

[0021] By adopting the above technical solution, before suspending the boom, the boom is first inserted into the positioning assembly. When the main winch is working, the boom is continuously lifted. When the bottom end of the boom is away from the ground, the positioning assembly is connected to the mast, and then the boom is limited by the locking device, so that the boom is not easy to shake, thereby facilitating the boom to pass through the slewing mechanism, so that the boom can drive the drilling tool vertically to the foundation for construction, reducing the possibility of foundation collapse.

[0022] Optionally, the positioning assembly includes a bracket, one end of the bracket is connected to the mast, the other end of the bracket is connected to a first magnet, the positioning platform is provided with a second magnet, the first magnet and the second magnet attract each other, and the positioning platform is provided with a groove for inserting the bracket.

[0023] By adopting the above technical solution, the bracket is inserted into the positioning platform, and then the positioning platform is connected to the mast through the first magnet and the second magnet.

[0024] Optionally, the positioning assembly also includes an L-rod, a first motor, and a telescopic rod, the first motor is connected to the mast, the output shaft of the first motor faces upward, one end of the L-rod is fixedly connected to the output shaft of the first motor, and the other end of the L-rod is connected to the telescopic rod, the telescopic rod is vertically arranged, the positioning platform is provided with a groove for inserting the telescopic rod, and a third magnet is provided at one end of the telescopic rod close to the positioning platform. After the telescopic rod is inserted into the positioning platform, the third magnet and the second magnet attract each other.

[0025] By adopting the above technical solution, after the positioning platform is installed on the bracket, the first motor is started. During the operation of the first motor, the L rod is driven to rotate, and the L rod drives the telescopic rod to rotate, so that the telescopic rod is inserted into the positioning platform, and the positioning platform is firmly fixed to the mast through the interaction force between the third magnet and the second magnet.

[0026] Optionally, a connecting block is slidingly provided on the mast, the first motor is connected to the connecting block, the bracket is also connected to the connecting block, the connecting block slides along the length direction of the mast, the mast is connected to a third motor, the output shaft of the third motor is fixed with a screw, and the connecting block is threadedly connected to the screw.

[0027] By adopting the above technical solution, the third motor drives the screw to rotate during operation, and the screw drives the connecting block to slide along the length direction of the mast, thereby controlling the third motor and the bracket to slide up and down, and adjusting the height of the positioning assembly.

[0028] Optionally, the cross section of the positioning hole is teardrop-shaped, the radius of the positioning hole away from the mast is larger than the radius of the positioning hole close to the mast, and the locking device is used to fit the boom to the smaller radius of the positioning hole.

[0029] By adopting the above technical solution, since different booms have different circumferences, a suitable position can be selected in the teardrop-shaped positioning hole to position them, which has the beneficial effect of adapting to booms with a wider range of circumferences.

[0030] Optionally, the locking device includes a fourth motor, a threaded rod, and a sleeve rod, the fourth motor is fixed to the positioning platform, the output shaft of the fourth motor is fixed to the threaded rod, one end of the sleeve rod is sleeved on the threaded rod and threadedly connected to the threaded rod, the other end of the sleeve rod is slidingly connected to the positioning platform, and an arc-shaped pad is fixed to the end of the sleeve rod away from the positioning platform, and the arc-shaped pad abuts against the side wall of the suspension rod.

[0031] By adopting the above technical solution, the fourth motor drives the threaded rod to rotate, and the threaded rod drives the sleeve rod to slide along the length direction of the threaded rod. When the sleeve rod moves closer to the mast, the arc-shaped pad presses the boom against the inner wall of the positioning hole opened in the positioning platform.

[0032] Optionally, the positioning platform includes a left half, a right half and a connecting piece, and the left half and the right half are connected by a plurality of connecting pieces.

[0033] By adopting the above technical solution, it is convenient to install the positioning platform on the boom.

[0034] Optionally, the telescopic rod includes a sleeve and a spring, one end of the spring is connected to the L rod, and the other end of the spring is connected to the third magnet, the third magnet and the spring are both located in the sleeve, the sleeve is sleeved on the L rod, and the sleeve is slidingly connected to the L rod, and the end of the sleeve close to the positioning platform is provided with an inclined surface to facilitate the telescopic rod to slide into the positioning platform.

[0035] By adopting the above technical solution, it is easy for the telescopic rod to slide into the positioning platform, and it is easy for the telescopic rod to be separated from the positioning platform.

[0036] In summary, this application has at least one of the following beneficial effects:

[0037] When encountering difficult-to-penetrate formations such as boulders, the pick barrel is replaced to drill the hole, which increases the drilling speed. After the boulder is drilled through, the rotary drilling rig can be continued to work, making it less likely for collapse to occur during foundation construction.

[0038] Before suspending the boom, insert the boom into the positioning assembly first. When the main winch is working, the boom is continuously lifted. When the bottom end of the boom is away from the ground, connect the positioning assembly to the mast, and then limit the boom through the locking device to make it less likely to shake, making it convenient to pass the boom through the slewing mechanism, so that the boom can drive the drilling tool vertically to the foundation for construction, reducing the possibility of foundation collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a three-dimensional diagram of a rotary drilling machine according to an embodiment of the present application;

[0040] Figure 2 This is a structural diagram of a positioning assembly for a rotary drilling machine according to an embodiment of the present application;

[0041] Figure 3 This is a structural diagram of a locking device for a rotary drilling rig according to an embodiment of the present application;

[0042] Figure 4 It is a structural schematic diagram of a connecting part of a rotary drilling rig in an embodiment of the present application.

[0043] Explanation of the accompanying drawings: 1. slewing mechanism; 2. moving track; 3. boom; 4. machine body; 5. mast; 6. main winch; 7. wire rope; 8. drilling tool; 9. positioning assembly; 10. positioning platform; 11. positioning hole; 12. locking device; 13. bracket; 14. first magnet; 15. second magnet; 16. L rod; 17. first motor; 18. telescopic rod; 19. third magnet; 20. connecting block; 21. third motor; 22. lead screw; 23. fourth motor; 24. threaded rod; 25. sleeve rod; 26. spring; 27. arc pad; 28. left half; 29. ​​right half; 30. connecting part; 31. sleeve; 32. inclined plane. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-4 This application is described in further detail.

[0045] The embodiment of the present application discloses a foundation pit foundation treatment process, comprising the following steps:

[0046] S1. Pile position measurement and setting out;

[0047] S2. Casing burial and pilot hole: Use a rotary drilling machine to drill a pilot hole at the construction site, use a vibratory hammer to bury the casing in the pilot hole and then backfill, and use the rotary drilling machine to initially pilot the hole. When encountering isolated rocks and other sand and gravel that are difficult to penetrate, use a pick barrel to drill the pilot hole;

[0048] S3. Hole making: Use a rotary drilling machine to make further holes. After the lead hole passes through the backfill layer, lower the vibrator to 30 cm from the bottom of the lead hole section. Turn on the water supply pump and air compressor. After the water and air at the lower end of the vibrator are out of normal, start the vibrator. Clean the mud residue at the hole mouth at any time during the hole making process.

[0049] S4. Hole cleaning: After the rotary drilling machine completes the hole drilling, the stone pile machine equipped with a vibrator is used to clean the hole. The vibrator is continuously lifted and lowered until the mud coming out of the hole becomes thinner.

[0050] S5. Pile making: The density of the filling material in the casing is controlled by continuously adding filling material into the hole. When a certain density is reached, the filling material is stopped and the casing is pulled out. During the pile making process, the filling material is mainly added continuously, supplemented by intermittent additions, so that the vibrator can penetrate to the original depth before lifting.

[0051] S6. Quality inspection and acceptance.

[0052] The present application also provides a rotary drilling machine suitable for the above foundation pit foundation treatment process, referring to Figure 1The rotary drilling rig includes a slewing mechanism 1, a moving crawler 2, a boom 3, and a mast 5. The moving crawler 2 is movably connected to a body 4. The running front end of the body 4 is fixed to the mast 5. A main winch 6 is fixed above the mast 5. The main winch 6 is provided with a wire rope 7 for lifting the boom 3. The end of the boom 3 close to the foundation is connected to a drilling tool 8. The boom 3 is connected to a positioning assembly 9. The positioning assembly 9 is connected to the mast 5 to limit the boom 3.

[0053] Reference Figure 1 、 Figure 2 and Figure 4 The positioning assembly 9 includes a positioning platform 10, a bracket 13, an L-shaped rod 16, a first motor 17, and a telescopic rod 18. One side of the positioning platform 10 is in contact with the side wall of the mast 5. The positioning platform 10 defines a positioning hole 11 for the boom 3 to pass through. The cross-section of the positioning hole 11 is teardrop-shaped. Specifically, the radius of the positioning hole 11 farther from the mast 5 is larger than the radius of the positioning hole 11 closer to the mast 5. One end of the bracket 13 is fixedly connected to the mast 5. The other end of the bracket 13 faces upward and is inserted into the positioning platform 10. The end of the bracket 13 near the positioning platform 10 is connected to a first magnet 14. A second magnet 15 is disposed within the positioning platform 10. The first magnet 14 and the second magnet 15 attract each other. The positioning platform 10 defines a groove for the bracket 13 to be inserted. Once inserted into the positioning platform 10, the bracket 13 is attracted to the positioning platform 10 by the attraction of the first magnet 14 and the second magnet 15. The first motor 17 is arranged vertically, and the output shaft of the first motor 17 is facing upward. The first motor 17 is connected to the side wall of the mast 5. One end of the L rod 16 is fixed to the output shaft of the first motor 17, and the other end of the L rod 16 is connected to the telescopic rod 18. The telescopic rod 18 is arranged vertically. The positioning platform 10 is provided with a groove for inserting the telescopic rod 18. A third magnet 19 is provided at one end of the telescopic rod 18 close to the positioning platform 10. After the telescopic rod 18 is inserted into the positioning platform 10, the third magnet 19 and the second magnet 15 attract each other.

[0054] Reference Figure 2 and Figure 4 The telescopic rod 18 includes a sleeve 31 and a spring 26. One end of the spring 26 is connected to the L rod 16, and the other end of the spring 26 is connected to the third magnet 19. The spring 26 and the third magnet 19 are both located in the sleeve 31. The sleeve 31 is sleeved on the L rod 16, and the sleeve 31 is slidingly connected to the L rod 16. An inclined surface 32 is provided at one end of the sleeve 31 close to the positioning platform 10 to facilitate the telescopic rod 18 to slide into the positioning platform 10 and to facilitate the separation of the telescopic rod 18 from the positioning platform 10.

[0055] Reference Figure 2 and Figure 3The positioning platform 10 includes a left half 28 , a right half 29 and a connecting member 30 . The left half 28 and the right half 29 are connected by a plurality of connecting members 30 . A portion of the connecting member 30 is bolted to the left half 28 , and another portion of the connecting member 30 is bolted to the right half 29 . The positioning platform 10 is provided with a locking device 12 for pressing the boom 3 against the side wall of the positioning hole 11 opened on the positioning platform 10. The locking device 12 includes a fourth motor 23, a threaded rod 24 and a sleeve rod 25. The fourth motor 23 is horizontally arranged and fixed to the positioning platform 10. The output shaft of the fourth motor 23 faces the mast 5. The output shaft of the fourth motor 23 is fixedly connected to the threaded rod 24. The threaded rod 24 is coaxial with the output shaft of the fourth motor 23. One end of the sleeve rod 25 is sleeved on the threaded rod 24 and threadedly connected to the threaded rod 24. The other end of the sleeve rod 25 is slidably connected to the positioning platform 10. An arc-shaped pad 27 is fixed to the end of the sleeve rod 25 away from the positioning platform 10. The arc-shaped pad 27 is used to abut against the side wall of the boom 3.

[0056] Reference Figure 1 A connecting block 20 is slidingly provided on the mast 5, the first motor 17 is fixed to the connecting block 20, the bracket 13 is also fixed to the connecting block 20, the connecting block 20 slides along the length direction of the mast 5, the mast 5 is connected to the third motor 21, the output shaft of the third motor 21 is fixed with a vertically arranged screw 22, and the connecting block 20 is threadedly connected to the screw 22.

[0057] The implementation principle of a rotary drilling rig in an embodiment of the present application is as follows: before suspending the boom 3, the boom 3 is first inserted into the positioning assembly 9. When the main winch 6 is working, the boom 3 is continuously lifted. When the bottom end of the boom 3 is away from the ground, the positioning assembly 9 is connected to the mast 5, and then the boom 3 is limited by the locking device 12, so that the boom 3 is not easy to shake, thereby facilitating the boom 3 to pass through the slewing mechanism 1, so that the boom 3 can drive the drilling tool 8 vertically to the foundation for construction. When encountering strata that are difficult to penetrate, such as boulders, the pick barrel is replaced to drill the hole, which increases the drilling speed. After the boulders are drilled through, the rotary drilling rig is continued to work, so that collapse is not easy to occur during the foundation construction process.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rotary drilling machine suitable for foundation pit treatment technology, characterized by: The invention comprises a slewing mechanism (1), a moving crawler (2) and a boom (3), wherein the moving crawler is movably connected to an organism (4), a mast (5) is fixed to the front end of the organism (4), a main winch (6) is fixed above the mast (5), and the main winch (6) is provided with a steel wire rope (7) for hoisting the boom (3), the boom (3) is connected to a drilling tool (8), the boom (3) is connected to a positioning assembly (9), the positioning assembly (9) is connected to the mast (5), the positioning assembly (9) comprises a positioning platform (10), the positioning platform (10) is used to be sleeved on the outside of the boom (3), the positioning platform (10) is provided with a positioning hole (11) for the boom (3) to pass through, and the positioning platform (10) is provided with a locking device (12), and the locking device (12) is used to lock the boom (3) and the positioning platform (10); The positioning assembly (9) includes a bracket (13), one end of the bracket (13) is connected to the mast (5), the other end of the bracket (13) is connected to a first magnet (14), the positioning platform (10) is provided with a second magnet (15), the first magnet (14) and the second magnet (15) attract each other, and the positioning platform (10) is provided with a groove for inserting the bracket (13); The positioning assembly (9) further includes an L-rod (16), a first motor (17) and a telescopic rod (18), wherein the first motor (17) is connected to the mast (5), the output shaft of the first motor (17) faces upward, one end of the L-rod (16) is fixedly connected to the output shaft of the first motor (17), and the other end of the L-rod (16) is connected to the telescopic rod (18), the telescopic rod (18) is vertically arranged, the positioning platform (10) is provided with a groove for inserting the telescopic rod (18), and a third magnet (19) is provided at one end of the telescopic rod (18) close to the positioning platform (10). After the telescopic rod (18) is inserted into the positioning platform (10), the third magnet (19) and the second magnet (15) attract each other.

2. A rotary drilling machine according to claim 1, characterized in that: A connecting block (20) is slidably provided on the mast (5), the first motor (17) is connected to the connecting block (20), the bracket (13) is also connected to the connecting block (20), the connecting block (20) slides along the length direction of the mast (5), the mast (5) is connected to a third motor (21), a lead screw (22) is fixed to the output shaft of the third motor (21), and the connecting block (20) is threadedly connected to the lead screw (22).

3. The rotary drilling machine according to claim 1, characterized in that: The cross section of the positioning hole (11) is in the shape of a water drop, the radius of the positioning hole (11) away from the mast (5) is larger than the radius of the positioning hole (11) close to the mast (5), and the locking device (12) is used to fit the boom (3) to the smaller radius of the positioning hole (11).

4. The rotary drilling machine according to claim 1, characterized in that: The locking device (12) includes a fourth motor (23), a threaded rod (24), and a sleeve rod (25). The fourth motor (23) is fixed to the positioning platform (10), and the output shaft of the fourth motor (23) is fixed to the threaded rod (24). One end of the sleeve rod (25) is sleeved on the threaded rod (24) and is threadedly connected to the threaded rod (24). The other end of the sleeve rod (25) is slidably connected to the positioning platform (10). An arc-shaped pad (27) is fixed to the end of the sleeve rod (25) away from the positioning platform (10), and the arc-shaped pad (27) abuts against the side wall of the suspension rod (3).

5. The rotary drilling machine according to claim 1, characterized in that: The positioning platform (10) comprises a left half (28), a right half (29) and a connecting piece (30), wherein the left half (28) and the right half (29) are connected via a plurality of connecting pieces (30).

6. The rotary drilling machine according to claim 1, characterized in that: The telescopic rod (18) includes a sleeve (31) and a spring (26), one end of the spring (26) is connected to the L rod (16), and the other end of the spring (26) is connected to the third magnet (19), the third magnet (19) and the spring (26) are both located in the sleeve (31), the sleeve (31) is sleeved on the L rod (16), and the sleeve (31) is slidably connected to the L rod (16), and an end of the sleeve (31) close to the positioning platform (10) is provided with an inclined surface (32) for facilitating the telescopic rod (18) to slide into the positioning platform (10).

7. The rotary drilling machine according to claim 1, characterized in that: The process includes the following steps: S1. Pile position measurement and setting out; S2. Casing burial and pilot hole: Use a rotary drilling machine to drill a pilot hole at the construction site, use a vibratory hammer to bury the casing in the pilot hole and then backfill, and use the rotary drilling machine to initially pilot the hole. When encountering sand and gravel that are difficult to penetrate, use a pick barrel to drill the pilot hole; S3. Hole making: Use a rotary drilling machine to make further holes. After the lead hole passes through the backfill layer, lower the vibrator to 30 cm from the bottom of the lead hole section. Turn on the water supply pump and air compressor. After the water and air at the lower end of the vibrator are out of normal, start the vibrator. Clean the mud residue at the hole mouth at any time during the hole making process. S4. Hole cleaning: After the rotary drilling machine completes the hole drilling, the stone pile machine equipped with a vibrator is used to clean the hole. The vibrator is continuously lifted and lowered until the mud coming out of the hole becomes thinner. S5. Pile making: Control the density of the filling material in the casing by continuously filling the hole. When a certain density is reached, stop filling and pull out the casing. S6. Quality inspection and acceptance.

8. The rotary drilling machine according to claim 7, characterized in that: During the pile making process, the filler is mainly fed continuously, supplemented by intermittent feeding, so that the vibrator can penetrate to the original depth before lifting.

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