An auger drill and a construction technology for auger cast-in-place piles

Abstract

The present application relates to a rotary drilling machine and a rotary drilling pile construction process, and relates to the technical field of construction machinery for building engineering. In order to solve the problem that the slag barrel will bring mud out of the hole when excavating the slag, affecting the structural stability of the pile hole, the application includes a power head, a drill rod and a drilling tool. The drilling tool includes a slag barrel and a bucket door at the bottom of the slag barrel that can be opened and closed. The drill rod is connected to the top plate of the slag barrel, and the bucket door is provided with a drill bit. A plurality of slurry discharge holes are provided on the side wall of the slag barrel. A splint is slidably provided in the slag barrel, and the splint can move toward the direction close to the axis of the slag barrel to squeeze the slag and squeeze out the mud in the slag. The power head is sleeved on the drill rod, and the power head and the drill rod are slidably connected. The power head can slide along the length direction of the drill rod, and a driving component for driving the splint to move is installed on the power head. The present application has the effect of reducing the loss of mud in the pile hole and improving the structural stability of the pile hole.

Description

Technical Field

[0001] The present application relates to the technical field of construction machinery for building engineering, and in particular to a rotary drilling machine and a rotary drilling pile construction process. Background Art

[0002] The rotary drilling rig is also called a rotary drilling rig or a pile driver. The rotary drilling rig is a comprehensive drilling rig that has the characteristics of fast hole-making speed, less pollution, and strong mobility. The rotary drilling rig uses a rotary drill bit to perform wet excavation operations under the condition of mud wall protection.

[0003] In the process of drilling holes with mud arm guards, the drilling system of the rotary drilling rig includes a drill bit and a drill rod. The drill bit consists of an auger and a slag barrel. The auger rotates and drills into the ground to cut the soil. The drill rod gradually extends. The slag barrel fills the slag barrel with slag under the action of rotation and gravity. Then the drill rod rises to a height above the ground. After the rotary main machine rotates a certain angle, the bottom door of the drill bit is opened to unload the slag in the slag barrel. The bucket door is closed and returned to the drilling location. The drill rod is lowered and the drill bit is put into the hole again for drilling operations. The holes are repeatedly drilled. In the process of drilling, the mud in the mud pool needs to be transported into the hole and the height of the mud liquid level in the hole is maintained. This is because during the drilling construction, the soil layer to be drilled is relatively loose, or the soil around the borehole is disturbed during drilling. The soil around the borehole has a tendency to collapse into the hole under the action of horizontal soil pressure. The mud can form a mud skin on the debris on the inner wall of the hole, and the mud is a semi-fluid that can support the hole wall, thereby reducing the phenomenon of hole collapse.

[0004] During the operation of the above-mentioned rotary drilling rig, when the slag barrel is being filled with slag, more mud will be loaded into the slag barrel together with the soil, and after the slag barrel is moved to one side, the mud will be discharged into the pile hole together with the slag. Although a number of through holes for the outflow of mud are opened on the side wall of the slag barrel, the through holes may be blocked or partially blocked, causing part of the mud to be carried out of the hole. If the mud is not replenished in time, it may affect the structural stability of the pile hole, and if the replenishment speed is too slow, it will affect the work efficiency. Summary of the invention

[0005] In order to reduce the loss of mud in the pile hole and thus improve the stability of the pile hole structure, the present application provides a rotary drilling machine and a construction process for rotary drilling piles.

[0006] In the first aspect, the present application provides a rotary drilling machine adopting the following technical solution:

[0007] A rotary drilling machine comprises a power head, a drill rod and a drilling tool, wherein the drilling tool comprises a slag removal barrel and a bucket door at the bottom of the slag removal barrel that can be opened and closed, the drill rod is connected to the top plate of the slag removal barrel, the bucket door is provided with a drill bit, and a plurality of slurry discharge holes are opened on the side wall of the slag removal barrel.

[0008] A clamping plate is slidably arranged in the slag removal barrel. The clamping plate can move towards the axis direction of the slag removal barrel to extrude the muck and squeeze out the slurry in the muck. The power head is sleeved on the drill pipe, and the power head is slidably connected to the drill pipe. The power head can slide along the length direction of the drill pipe. A driving assembly for driving the clamping plate to move is installed on the power head.

[0009] By adopting the above technical solution, when the slag removal barrel lifts the muck to the orifice of the pile hole, the driving assembly drives the clamping plate to move. The clamping plate extrudes the muck in the slag removal barrel, squeezes out the slurry in the muck, and the slurry flows into the pile hole through the slurry discharge hole, reducing the loss rate of the slurry in the pile hole, thereby improving the stability of the side wall of the pile hole.

[0010] Preferably, a plurality of limiting rods are inserted through the clamping plate. One end of the limiting rod is fixedly connected to the inner side wall of the slag removal barrel, and the clamping plate can slide on the limiting rod.

[0011] By adopting the above technical solution, on the one hand, the limiting rod plays a supporting role for the clamping plate, which is beneficial to placing the clamping plate in the slag removal barrel; on the other hand, the limiting rod plays a guiding role for the moving direction of the clamping plate, reducing the occurrence of the phenomenon that the clamping plate deviates.

[0012] Preferably, the clamping plate is arc-shaped and can be in contact with the inner side wall of the slag removal barrel. A plurality of plungers corresponding to the positions of the slurry discharge holes are connected to the surface of the clamping plate in contact with the inner side wall of the slag removal barrel. The plungers can open and close the slurry discharge holes following the movement of the clamping plate.

[0013] By adopting the above technical solution, during the process of rotary drilling the muck, the soil will block the slurry discharge hole, making it difficult for the slurry in the slag removal barrel to be discharged into the pile hole. The slurry discharge hole is blocked by the plunger, reducing the possibility of the slurry discharge hole being blocked by the muck. When the clamping plate extrudes the muck, the plunger follows the clamping plate to move, so that the plunger is pulled out of the slurry discharge hole, realizing the function of discharging the slurry through the slurry discharge hole.

[0014] Preferably, one end of the clamping plate close to the inner side of the top plate of the slag removal barrel is connected with a sliding rod. A sliding groove for the sliding rod to pass through and slide is opened on the top plate of the slag removal barrel. The driving assembly is used to drive the sliding rod to move in the sliding groove.

[0015] By adopting the above technical solution, the driving assembly drives the sliding rod to move in the sliding groove, and the sliding rod drives the clamping plate in the slag removal barrel to move together with the sliding rod, realizing the function of extruding the muck in the slag removal barrel by the clamping plate.

[0016] Preferably, one end of the sliding rod outside the slag scooping cylinder is beveled. The driving assembly includes an abutting rod installed on the power head. One end of the abutting rod is provided with a guiding bevel surface. The guiding bevel surface of the abutting rod fits and can abut against the beveled end of the sliding rod. When the sliding rod abuts against the guiding bevel surface and the power head and the slag scooping cylinder continue to approach, the sliding rod can move along the sliding groove.

[0017] By adopting the above technical solution, the power head moves up and down the drill pipe until the guiding bevel surface of the abutting rod fits with the bevel surface of the sliding rod. When the abutting rod continues to move down, the sliding rod moves in the sliding groove under the thrust of the abutting rod, thereby driving the clamping plate to move in the slag scooping cylinder.

[0018] Preferably, there are two clamping plates. The moving directions of the sliding rods on the two clamping plates are on the same straight line. The side walls of the ends of the two sliding rods are connected to the same telescopic rod.

[0019] By adopting the above technical solution, when the two clamping plates move towards each other, the extrusion effect on the muck is better, and the mud can be filtered out of the muck as much as possible. The telescopic rod is connected to the two sliding rods, thereby fixing the relative positions of the two clamping plates.

[0020] Preferably, a restoring assembly for moving the clamping plate to abut against the inner side wall of the slag scooping cylinder is installed on the sliding rod.

[0021] By adopting the above technical solution, when the abutting rod does not exert a force on the sliding rod, the restoring assembly resets the sliding rod and the clamping plate, facilitating the subsequent continuous operation of the rotary drilling rig.

[0022] Preferably, the restoring assembly includes a spring sleeved on the telescopic rod. The two ends of the spring are respectively fixedly connected to the side walls of the two sliding rods.

[0023] By adopting the above technical solution, when the abutting rod exerts a force on the sliding rod and the clamping plates approach each other, the spring contracts. When the force exerted by the abutting rod on the sliding rod is removed, the spring returns to its original state, resets the sliding rod, and at the same time makes the clamping plate abut against the inner side wall of the slag scooping cylinder.

[0024] Second, the present application provides a construction process for a rotary drilled pile, including the following steps:

[0025] S1. Determine the pile position, and excavate the mud pit and mud ditch;

[0026] S2. Bury the casing and position the rotary drilling rig;

[0027] S3. Carry out rotary drilling construction with the rotary drilling rig and divert the mud into the hole;

[0028] S4. Fabricate the steel reinforcement cage, lower the steel reinforcement cage and the conduit into the hole, and carry out the casting of underwater concrete;

[0029] S5. After the concrete pouring is completed, the casing is pulled out and the hole is backfilled;

[0030] S6. Excavate the foundation trench and finally chisel out the pile head.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The driving assembly drives the clamping plate to move, and the clamping plate squeezes the slag in the slag removal tube, squeezes out the mud in the slag, and flows into the pile hole from the slurry discharge hole, reducing the loss rate of the mud in the pile hole, thereby improving the stability of the side wall of the pile hole;

[0033] 2. Use a plunger to block the slurry discharge hole to reduce the possibility of the slurry discharge hole being blocked by the slag. When the splint squeezes the slag, the plunger is pulled out from the slurry discharge hole to realize the slurry discharge function;

[0034] 3. When the abutment rod exerts a force on the slide bar and the clamping plates approach each other, the spring contracts. When the force exerted by the abutment rod on the slide bar is removed, the spring returns to its original state and resets the slide bar, while making the clamping plates abut against the inner wall of the slag removal barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of a rotary drilling machine according to an embodiment of the present application;

[0036] Figure 2 It is a bottom view of a rotary drilling machine according to an embodiment of the present application;

[0037] Figure 3 It is an exploded schematic diagram of a rotary drilling machine according to an embodiment of the present application;

[0038] Figure 4 It is a cross-sectional schematic diagram of a slag removal barrel of a rotary drilling rig according to an embodiment of the present application.

[0039] Explanation of the reference numerals in the accompanying drawings: 1. power head; 11. driving assembly; 12. abutment rod; 13. guide slope; 2. drill rod; 3. drilling tool; 4. slag removal barrel; 41. clamping plate; 42. slurry unloading hole; 43. plunger; 44. limiting rod; 45. sliding rod; 46. slide groove; 47. telescopic rod; 48. recovery assembly; 49. limiting hole; 5. bucket door; 51. bucket tooth; 52. notch; 53. hook; 6. opening and closing rod; 61. limiting plate; 62. restraining plate; 63. torsion spring; 64. first connecting rod; 65. second connecting rod; 66. limiting block; 67. hook. DETAILED DESCRIPTION

[0040] The following is combined with Figures 1-4 This application is described in further detail.

[0041] The present application embodiment discloses a rotary drilling machine.Figure 1 and Figure 2 , including a power head 1, a drill rod 2 and a drilling tool 3. The drilling tool 3 includes a cylindrical slag removal barrel 4 and a bucket door 5 located at the bottom of the slag removal barrel 4. A drill bit is installed on the bucket door 5. In this embodiment, the drill bit is a bucket tooth 51. The bucket teeth 51 are distributed on the central axis of the bucket door 5, and the bucket door 5 on both sides of the bucket teeth 51 is provided with an arched notch 52.

[0042] Reference Figure 1 and Figure 3 The power head 1 is sleeved on the drill rod 2 and can reciprocate along the length direction of the drill rod 2, or the drill rod 2 can reciprocate along its own axis, and when the drill rod 2 rotates, the power head 1 can rotate together with the drill rod 2, and one end of the drill rod 2 is fixedly connected to the top plate of the slag removal barrel 4. The above are all functions of conventional rotary drilling rigs and are not described in detail here. The inner wall of the slag removal barrel 4 is fitted with a splint 41, and the splint 41 is arc-shaped and there are two of them. The two splints 41 are symmetrically arranged on the inner walls of the slag removal barrel 4 on both sides of the slag removal barrel 4 with the axis of the slag removal barrel 4, and there is a gap between the splints 41. The power head 1 is equipped with a driving assembly 11 that drives the splint 41 to move away from the inner wall of the slag removal barrel 4. A plurality of slurry discharge holes 42 are opened on the side wall of the slag removal barrel 4, and a plunger 43 corresponding to the slurry discharge hole 42 is installed on the side of the splint 41 that abuts against the slag removal barrel 4, and the plunger 43 can be inserted into the slurry discharge hole 42 to close the slurry discharge hole 42.

[0043] During the drilling process, the plunger 43 closes the grouting hole 42 to reduce the amount of mud entering the pile hole, thereby reducing the amount of mud being carried out. When the slag barrel 4 is digging, the grouting hole 42 is closed. When the slag barrel 4 is loaded with slag and lifted upward, the driving assembly 11 drives the clamping plate 41 away from the inner wall of the slag barrel 4, thereby pulling the plunger 43 out of the grouting hole 42 to facilitate the outflow of mud. When the two clamping plates 41 are close to each other, the clamping plates 41 squeeze the slag in the slag barrel 4, squeeze out the mud in the slag, and the overflowed mud flows out from the arched notch 52 of the bucket 5 and the grouting hole 42 on the side wall of the slag barrel 4, thereby falling back into the pile hole, reducing the loss of mud in the pile hole.

[0044] Reference Figure 3 A plurality of limiting holes 49 are provided on the clamping plate 41, and a plurality of limiting rods 44 corresponding to the limiting holes 49 are fixedly connected to the inner wall of the slag removal tube 4. The limiting rods 44 are passed through the limiting holes 49. The limiting rods 44 support the clamping plate 41, and the clamping plate 41 can move repeatedly on the limiting rods 44. The limiting rods 44 have a limiting and guiding effect on the moving direction of the clamping plate 41.

[0045] One side of the clamping plate 41 close to the top plate of the slag removal cylinder 4 is fixedly connected with a sliding rod 45 passing through the top wall of the slag removal cylinder 4. There are two sliding rods 45 on each clamping plate 41, which are respectively arranged at both ends of the clamping plate 41 close to the side wall of the top plate of the slag removal cylinder 4. The end of the sliding rod 45 away from the clamping plate 41 is provided with an inclined surface. A chute 46 for the sliding rod 45 to pass through and move is opened on the top plate of the slag removal cylinder 4. The number of the chutes 46 is the same as that of the limiting rods 44, and the length direction of the chute 46 is perpendicular to the axis of the two clamping plates 41. A driving component 11 for driving the clamping plate 41 to move is installed on the power head 1. The driving component 11 includes a contact rod 12 fixedly connected to the power head 1 and perpendicular to the power head 1. The end of the contact rod 12 away from the power head 1 is provided with a guiding inclined surface 13, and the guiding inclined surface 13 of the contact rod 12 fits with the inclined surface of the sliding rod 45.

[0046] When the slag removal cylinder 4 brings the muck to the upper part of the pile hole, the power head 1 approaches the slag removal cylinder 4 along the drill rod 2. The guiding inclined surface 13 of the contact rod 12 abuts against the inclined surface of the sliding rod 45. The power head 1 continues to move downward, and the contact rod 12 pushes the sliding rod 45 to move along the length direction of the chute 46, so that the two clamping plates 41 approach each other, squeezing the muck in the slag removal cylinder 4, thereby discharging the mud.

[0047] Refer to Figure 1 and Figure 3 As shown in [figures] and [figures], a restoring component 48 is installed on two adjacent sliding rods 45 on the two clamping plates 41. An expansion link 47 is fixedly connected between two adjacent sliding rods 45 on the two clamping plates 41. The restoring component 48 includes a spring sleeved on the expansion link 47. The two ends of the spring are respectively fixedly connected to the side walls of the two sliding rods 45. When the two clamping plates 41 approach each other, the contact rod 12 pushes the sliding rod 45 to move. When the two sliding rods 45 approach each other, an extrusion force is generated on the expansion link 47 and the spring, causing the expansion link 47 to shorten, and the spring contracts along the length direction of the expansion link 47, reducing the phenomenon that the spring generates radial bending.

[0048] When the contact rod 12 moves away from the sliding rod 45 until the contact rod 12 is not in contact with the sliding rod 45, the sliding rod 45 loses the thrust of the contact rod 12, and the spring returns to its original length, thereby pushing the sliding rod 45 to move, so that the two clamping plates 41 move away from each other until they respectively abut against the inner side wall of the slag removal cylinder 4.

[0049] In other embodiments of the present application, the number of the clamping plates 41 can also be other numbers, such as four arranged at intervals of 90 degrees around the axis of the slag removal cylinder 4. By adjusting the number and position of the sliding rods 45 and the contact rods 12, as well as the orientation of the inclined surfaces.

[0050] Refer to Figure 2 and Figure 4A hinge is connected between the bottom of the slag removal barrel 4 and the bucket door 5. One end of the bucket door 5 is hinged to the slag removal barrel 4 through the hinge. An opening and closing rod 6 is arranged in the slag removal barrel 4. One end of the opening and closing rod 6 vertically passes through the top plate of the slag removal barrel 4. A limit plate 61 is connected to the top plate of the slag removal barrel 4. The limit plate 61 is L-shaped. One side of the limit plate 61 is perpendicular to the top plate of the slag removal barrel 4. The other side of the limit plate 61 is located directly above the opening and closing rod 6. The opening and closing rod 6 passes through the limit plate 61 at the same time. A torsion spring 63 is sleeved on the opening and closing rod 6 located between the limit plate 61 and the top plate of the slag removal barrel 4. The inner wall of the slag removal barrel 4 is fixedly connected with a restraining plate 62, one end of the opening and closing rod 6 located in the slag removal barrel 4 passes through the restraining plate 62 and is rotatably connected with a first connecting rod 64, one end of the first connecting rod 64 away from the opening and closing rod 6 is rotatably connected with a second connecting rod 65, one end of the second connecting rod 65 away from the first connecting rod 64 is connected with a hook 67, the middle part of the second connecting rod 65 is rotatably connected with a limit block 66, and the limit block 66 is fixedly connected to the inner wall of the slag removal barrel 4. The end of the bucket door 5 away from the loose-leaf is connected with a hook head 53 engaged with the hook 67, and a hook groove for the hook 67 to move is provided on the side wall of the slag removal barrel 4.

[0051] The power head 1 contacts the opening and closing rod 6 during the downward movement and applies a downward thrust to the opening and closing rod 6. The torsion spring 63 contracts, and the constraint plate 62 restricts the opening and closing rod 6 to move only in the vertical direction. The opening and closing rod 6 applies pressure to the first connecting rod 64, and the first connecting rod 64 applies a thrust to the second connecting rod 65, so that the second connecting rod 65 rotates around the limit block 66, so that the hook 67 passes through the hook groove and disengages from the hook head 53, thereby opening the bucket door 5.

[0052] The end of the hopper door 5 away from the hinge is in a hanging state under the action of gravity. When the power head 1 moves up and disengages from the opening and closing rod 6, the hanging end of the hopper door 5 is brought into contact with the ground and the slag removal tube 4 is moved toward the ground. The hopper door 5 rotates around the hinge, and the hook head 53 is engaged with the hook 67 to complete the closing of the hopper door 5.

[0053] The implementation principle of a rotary drilling machine in the embodiment of the present application is as follows: when the slag barrel 4 is filled with slag from the pile hole and rises above the pile hole, the power head 1 approaches the slag barrel 4 along the drill rod 2, and the guide inclined surface 13 of the abutment rod 12 abuts against the inclined surface of the slide rod 45, and the power head 1 continues to move downward until the side wall of the abutment rod 12 abuts against the side wall of the slide rod 45, and the abutment rod 12 pushes the slide rod 45 to move along the length direction of the slide groove 46, and the telescopic rod 47 and the spring are compressed. When the slide rod 45 moves in the slide groove 46, it applies thrust to the two clamps 41 respectively, so that the two clamps 41 move along the length direction of the corresponding limit rod 44 and approach each other, and the two clamps 41 squeeze the slag in the slag barrel 4, thereby squeezing the mud out of the slag. When the two clamps 41 are close, the plunger 43 is separated from the slurry discharge hole 42, which facilitates the discharge of mud from the slurry discharge hole 42.

[0054] Then, the slag removal barrel 4 is transferred outside the pile hole, and the power head 1 continues to move downward until the power head 1 contacts the opening and closing rod 6, and the power head 1 applies a thrust to the opening and closing rod 6, the torsion spring 63 contracts, and the constraint plate 62 restricts the opening and closing rod 6 to move only in the vertical direction. The opening and closing rod 6 applies pressure to the first connecting rod 64, and the first connecting rod 64 applies a thrust to the second connecting rod 65, so that the second connecting rod 65 rotates around the limit block 66, so that the hook 67 passes through the hook groove and disengages from the hook head 53, thereby opening the bucket door 5 and unloading the slag from the slag removal barrel 4.

[0055] After the power head 1 moves upward to be separated from the opening and closing rod 6 and the soil is discharged, the hanging end of the bucket door 5 is abutted against the ground and the slag removal tube 4 is moved toward the ground. The bucket door 5 rotates with the hinge as the axis, and the hook head 53 is engaged with the hook 67 to close the bucket door 5. The power head 1 continues to move upward until the abutment rod 12 is no longer in contact with the slide bar 45, the slide bar 45 loses the thrust of the abutment rod 12, and the spring returns to its original length, thereby pushing the slide bar 45 to move, so that the two clamping plates 41 move back to back until they are respectively abutted against the inner wall of the slag removal tube 4.

[0056] The slag in the slag removal tube 4 is squeezed by the clamping plate 41 to squeeze out the mud in the slag, and the overflowing mud flows out from the arched notch 52 of the bucket 5 and the slurry discharge hole 42 on the side wall of the slag removal tube 4, and then falls into the pile hole, reducing the loss of mud in the pile hole.

[0057] The present application also discloses a construction process for rotary pile drilling, comprising the following steps:

[0058] S1: Measure and lay out the pile positions according to the design drawings, use a total station to determine the pile positions, and excavate mud pools and mud trenches at the construction site to connect the mud pools with the pile holes;

[0059] S2: Use a rotary drilling machine to dig a hole larger than the pile hole diameter at the pile position, and bury a casing in the hole. The central axis of the casing is aligned with the measured pile position center, and the verticality of the casing is strictly maintained;

[0060] S3: The rotary drilling machine is used to drill and drain the mud into the pile hole during the drilling process to stabilize the soil at the hole mouth and protect the hole wall;

[0061] S4: After the pile hole is excavated, a steel cage is made and hoisted into the pile hole by a crane. A suitable conduit is selected and hoisted into the pile hole. The bottom of the conduit is lowered to about 500mm above the hole bottom elevation. A funnel is installed on the top of the conduit, and concrete is poured from the funnel. The conduit is pulled out while pouring concrete, so that the bottom of the conduit is always located in the poured concrete.

[0062] S5: After the concrete pouring is completed, before the concrete begins to set, pull out the casing from the orifice of the hole. When lifting the casing, keep the casing vertical to reduce damage to the poured concrete, and then backfill the side wall of the opening.

[0063] S6: Excavate the foundation trench and chisel the pile head manually.

[0064] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A rotary drilling machine, comprising a power head (1), a drill rod (2) and a drilling tool (3), wherein the drilling tool (3) comprises a slag removal barrel (4) and a hopper (5) located at the bottom of the slag removal barrel (4) and capable of being opened and closed, the drill rod (2) being connected to a top plate of the slag removal barrel (4), the hopper (5) being provided with a drill bit, and a plurality of slurry discharge holes (42) being provided on a side wall of the slag removal barrel (4), characterized in that: A clamping plate (41) is slidably arranged in the slag removal barrel (4), and the clamping plate (41) can move toward the axis of the slag removal barrel (4) to squeeze the slag and squeeze out the mud in the slag. The power head (1) is sleeved on the drill rod (2), and the power head (1) and the drill rod (2) are slidably connected. The power head (1) can slide along the length direction of the drill rod (2), and a driving component (11) for driving the clamping plate (41) to move is installed on the power head (1); A plurality of limiting rods (44) are provided on the clamping plate (41), one end of the limiting rod (44) is fixedly connected to the inner wall of the slag removal tube (4), and the clamping plate (41) can slide on the limiting rod (44); The clamping plate (41) is arc-shaped and can abut against the inner wall of the slag removal barrel (4); a surface of the clamping plate (41) abutting against the inner wall of the slag removal barrel (4) is connected to a plurality of plungers (43) corresponding to the positions of the slurry discharge holes (42); the plungers (43) move with the clamping plate (41) and can open and close the slurry discharge holes (42); One end of the clamping plate (41) close to the inner side of the top plate of the slag removal barrel (4) is connected to a sliding rod (45); a sliding groove (46) for the sliding rod (45) to pass through and slide is provided on the top plate of the slag removal barrel (4); and the driving component (11) is used to drive the sliding rod (45) to move in the sliding groove (46); One end of the slide bar (45) located outside the slag removal barrel (4) is an inclined surface, the drive assembly (11) comprises an abutting rod (12) mounted on the power head (1), one end of the abutting rod (12) is provided with a guiding inclined surface (13), the guiding inclined surface (13) of the abutting rod (12) fits with and can abut against the inclined surface end of the slide bar (45), when the slide bar (45) and the guiding inclined surface (13) abut against each other and the power head (1) and the slag removal barrel (4) continue to approach each other, the slide bar (45) can move along the slide groove (46); There are two clamping plates (41), the movement directions of the slide bars (45) on the two clamping plates (41) are located on the same straight line, and the end side walls of the two slide bars (45) are connected to the same telescopic rod (47).

2. The rotary drilling rig according to claim 1, characterized in that, The slide bar (45) is provided with a restoring assembly (48) for moving the clamping plate (41) to abut against the inner wall of the slag removal barrel (4).

3. A rotary drilling rig according to claim 2, wherein, The restoration component (48) comprises a spring sleeved on the telescopic rod (47), and two ends of the spring are respectively fixedly connected to the side walls of the two sliding rods (45).

4. A construction process for a rotary drilling pile, using the rotary drilling rig described in any one of claims 1 - 3, characterized in that, The following steps are involved: S1. Determine the pile position, excavate the mud pool and mud trench; S2.Bury the casing and put the rotary drilling machine in place; S3. Drilling with a rotary drilling machine to divert the mud into the hole; S4. Make a steel cage and lower the steel cage and conduit into the hole to pour concrete in the pile hole; After the concrete pouring is completed, pull out the casing and backfill the hole opening; S6. Excavate the foundation trench and finally chisel the pile head.

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