High-frequency impact double-rotary-cutting tunneling type large-diameter pile hole drilling machine

Abstract

The utility model provides a high-frequency impact double-rotary-cutting tunneling type large-diameter pile hole drilling machine which comprises a walking device with a lifting device and a power system, a monitoring device and an impact milling device driven by the lifting device to ascend and descend. The impact milling device comprises a vertical guide cylinder, a deslagging system, grouped impact-rotary drill bits and vertical high-frequency impact devices correspondingly arranged. The guide cylinder is connected with lifting equipment through a rigid drill rod and is driven to rotate by a power motor arranged on the ground; or the guide cylinder is suspended below the lifting equipment through a rotary connecting piece, and is driven to revolve under the driving of circumferential rock-soil friction force generated by rotating and symmetrically arranging the impact-rotary drill bit mounted below the guide cylinder around the axis of the guide cylinder and rotating in the same direction; and the impact-rotation drill bit synchronously revolves along with the guide cylinder while rotating in an impact mode, and double-rotation milling of rotation and revolution is carried out on the rock soil.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high -frequency impact double rotary cutting tunneling type large -diameter pile hole drilling machine, is applicable to the construction of large -diameter bored pile in hard rock and other complex stratum, belongs to pile foundation equipment field. BACKGROUND

[0002] In the construction of large bridges and other projects, in hard rock and other complex stratum, the construction of large-diameter bored piles is inefficient and costly, and it is even more difficult to tunnel in rock layers above medium weathering. This is a difficult problem in the construction of large bridges and other projects.

[0003] The applicant has applied for an invention patent for a suspension type multi-drill head rotary-impact combined tunneling type engineering slotter (application number: 20181065944330.X, utility model also applied for, application number 201820980721.7). The invention relates to a suspension type multi-drill head rotary-impact combined tunneling type engineering slotter, which comprises a walking device with a winch device and a power system and a monitoring device. The winch device is suspended at the traction end of the impact milling device, which comprises a vertical guide frame, a deviation correction device, a group of drill heads, and a corresponding vertical high-frequency impact device. The drill head transmission shafts in each group are connected through a power distribution box arranged in the guide frame box-shaped bottom beam or the middle cross beam, and are driven to rotate by the same power driving device. The drill rod of the high-frequency impact device is pushed against the top of the single drill head transmission shaft by the spring buffer device or the plunger cylinder, or is pushed against the top surface of the connecting cross beam connecting a group of drill head transmission shafts. The connecting cross beam of a group of drill head transmission shafts and the guide frame box-shaped bottom beam are connected by a group of suspension sliding devices. The slotter can efficiently complete the slotting operation of various complex strata including soil, rock, gravel, and boulders, with good results. During the slotting process, the high-frequency impact and rotary milling combined tunneling mechanism is basically realized, which has the characteristics of narrow slotting, deep slotting, and low damage to the surrounding rock layer, and has important practical significance in foundation engineering.

[0004] In the engineering test and practice of the impact and rotary milling combined tunneling slotter, the applicant found that the high-frequency impact and rotary milling combined tunneling mechanism has great advantages in dealing with hard rock and other complex strata. However, the slotter can only straighten the slot, and cannot solve the problem of large pile hole tunneling. Therefore, the applicant further innovates to complete the innovative structure of realizing the high-frequency impact and rotary milling combined tunneling mechanism in the large pile hole drilling machine, which can solve the problem of low construction efficiency of large-diameter bored piles in hard rock and other complex strata in large bridge and other projects. INNOVATIVE CONTENT

[0005] The application provides a high-frequency impact double rotary cutting tunneling large-diameter pile hole drilling machine, which solves a series of structural problems of a power system related to revolution of an impact rotary drill bit on the basis of a high-frequency impact-rotation mechanism and handles a slag discharge system, a pressure oil pipeline system and a vertical guide of a tunneling device of multiple drill bits in a self-rotation and revolution combination state.

[0006] The application provides a high-frequency impact double rotary cutting tunneling large-diameter pile hole drilling machine, which solves a series of structural problems of a power system related to revolution of an impact rotary drill bit on the basis of a high-frequency impact-rotation mechanism and handles a slag discharge system, a pressure oil pipeline system and a vertical guide of a tunneling device of multiple drill bits in a self-rotation and revolution combination state.

[0007] The guide cylinder is connected with the lifting device through a rigid drill rod, and is driven to rotate by a power motor of the rigid drill rod arranged on the ground.

[0008] Alternatively, the guide cylinder is suspended below the lifting device through a rotary connecting piece, and is driven to revolve around the guide cylinder by circumferential rock-soil friction force generated by the impact-rotation drill bit symmetrically arranged around the axis of the guide cylinder.

[0009] The impact-rotation drill bit revolves around the guide cylinder synchronously while rotating and impacting, and performs double rotary milling of self-rotation and revolution on rock-soil.

[0010] Further, the bottom of the slag discharge branch pipe of the slag discharge system is communicated with the slag discharge hole in the center of the impact-rotation drill bit through a rotary sleeve at the bottom end of the transmission drill rod, and the slag discharge branch pipes of the drill bits are connected to the slag discharge main pipe at the top of the protection cylinder of the high-frequency impact device.

[0011] Alternatively, the bottom of the slag discharge branch pipe of the slag discharge system is close to the outside of the drill rod on the upper surface of the impact-rotation drill bit, a communication groove is arranged between the upper surface and the bottom of the impact-rotation drill bit, and the slag discharge branch pipes of the drill bits are connected to the slag discharge main pipe at the top of the protection cylinder of the high-frequency impact device.

[0012] Further, the top of the rigid drill pipe is provided with a multi-channel rotary sealing joint, and the slag removal main pipe is connected with the ground sand pump slag removal hose through the multi-channel rotary sealing joint.

[0013] Further, the slag removal main pipe is connected with the ground sand pump slag removal hose, and the rigid drill pipe power motor drives the rigid drill pipe linkage guide cylinder to reciprocate and swing at a preset angle to realize double rotary milling and make the impact rotary milling point of the drill bit teeth spread throughout the hole.

[0014] Further, the guide cylinder is connected with the lifting device through the rigid drill pipe, and the rigid drill pipe is drivingly connected with the output shaft of the rigid drill pipe power motor arranged on the ground.

[0015] The guide cylinder comprises an intermediate connecting cylinder, an impact hammer protection cylinder and a power distribution box which are fixedly and sealingly connected, the top of the intermediate connecting cylinder is fixedly provided with a cross beam which is fixedly connected with the bottom of the rigid drill pipe, the centers of the rigid drill pipe and the cross beam are hollow structures, the high-frequency impact device is arranged in the impact hammer protection cylinder, and the transmission shaft of the impact-rotary drill bit is arranged in the power distribution box.

[0016] Further, the guide cylinder is hung below the lifting device through a rotary hanger ring connected with a suspension wire rope, and the guide cylinder comprises a rotary sealing joint protection cylinder, an intermediate connecting cylinder, an impact hammer protection cylinder and a power distribution box which are fixedly and sealingly connected from top to bottom.

[0017] The top of the rotary sealing joint protection cylinder is connected with a hanger cylinder assembly and a transverse partition plate, the hanger cylinder assembly comprises a cross hanger beam, a hanger cylinder and a hanger cylinder box body, the top of the cross hanger beam is connected with the rotary hanger ring, the upper end of the hanger cylinder is fixedly inserted into the cross hanger beam, the hanger cylinder box body is sleeved with the lower end of the hanger cylinder and is supported and limited by a hanger cylinder upper flange, a plane bearing and a radial bearing, and the hanger cylinder box body is fixedly connected with the top of the rotary sealing joint protection cylinder.

[0018] The transverse partition plate is fixed on the inner wall of the hanger cylinder, the rotary shaft of the multi-channel rotary sealing joint is fixed at the mounting hole in the center of the transverse partition plate through a rotary joint mounting flange, and each joint of the rotary shaft is connected with external equipment through a hose. The rotary sleeve of the multi-channel rotary sealing joint is fixed in the rotary joint protection cylinder through a multi-channel joint rotary sleeve support beam. Each oil pipe passes through the gap of the support beam and is connected with the related oil nozzle, and the upper and lower slag removal rotary pipe interfaces in the center of the multi-channel joint are connected with the slag removal pipeline through hoses. Even if there is high-frequency vibration, the slag can be normally removed and the oil can be normally supplied. The slag removal main pipe is connected with the ground sand pump slag removal hose through the multi-channel rotary sealing joint.

[0019] Further, a group of hydraulic deviation correction push rods are arranged on the peripheral wall of the lifting cylinder, and a ratchet wheel is arranged at the end of the hydraulic deviation correction push rod.

[0020] In addition to timely stretching and retracting in different directions to correct the deviation of the guide cylinder and maintain the perpendicularity of the guide cylinder according to the deviation of the guide cylinder during the tunneling process, the ratchet wheel at the end of the hydraulic deviation correction push rod is moderately cut into the surrounding rock, and the ratchet wheel also has the effect of preventing the rotation of the lifting cylinder. The lifting cylinder only slides vertically downward following the guide cylinder without rotating circumferentially, so as to facilitate the connection of the power oil pipe and the mud conveying pipeline to the winding device of the ground main machine.

[0021] Further, the impact-rotary drill bit comprises a center drill bit and a plurality of groups of peripheral drill bits that are rotationally symmetrically arranged around the center of the pile hole, two adjacent peripheral drill bits in each group are driven by the same hydraulic motor, the center drill bit is driven by a through-hole spline hydraulic motor, the plurality of groups of rotationally symmetrically arranged peripheral drill bits rotate in the same direction, and the center drill bit rotates in the opposite direction to the peripheral drill bits. Due to the rotation of the plurality of groups of peripheral drill bits in the same direction, the total friction force of the rock and soil forms a torque around the center of the pile hole during the impact-rotary milling and tunneling process, so as to drive the entire guide cylinder and the tunneling device to revolve slowly around the center of the pile hole.

[0022] Further, the impact-rotary drill bit comprises a center drill bit and N peripheral drill bits that are rotationally symmetrically arranged around the center of the pile hole, the center drill bit and the peripheral drill bits are independently driven by one through-hole spline hydraulic motor respectively, and the angle of rotation and swing of the rigid drill rod driven guide cylinder is 0-360° / N.

[0023] Further, in order to adapt to underwater operation, the inside and outside of the sealed guide cylinder and the box are inflated to maintain pressure balance or slight positive pressure, the components in the box and the guide cylinder are sealed and protected, and mud and water are prevented from entering.

[0024] The technical scheme provided in the application has at least the following technical effects or advantages:

[0025] The utility model discloses a pile hole full section high frequency impact-rotary milling mechanism improves rock tunneling efficiency, can cope with various rock layers including hard rock layer. The utility model discloses through two different ways, by the rigid drill rod power motor drive rotation of setting on the ground, or by the impact-rotary drill head of a plurality of around the guide cylinder axial rotation symmetry arrangement same direction rotation and produce the circumferential rock and soil friction force drive under revolution, thereby solved the rigid drill rod lift or the guide cylinder of steel wire rope suspension lift and its impact rotary tunneling device's revolution problem, make impact rotary action point spread whole hole, simultaneously through many passageways rotary sealing device, solved the slag problem under the revolution of tunneling device, and the arrangement of power oil pipeline, realized high frequency impact double rotary milling state under high -efficient mud reverse circulation slag, solved the difficult problem of pile hole tunneling in complex stratum. High frequency moderate impact reaches the critical value of rock breaking, while efficient drilling, can keep the integrity of the rock of hole wall periphery, improve the bearing capacity of pile foundation, especially because the integrity of the rock of hole wall periphery guarantees the lateral bearing capacity of pile, this in cable-stayed bridge etc. engineering construction, more important, cope with very big lateral tension, can greatly save the amount of work and cost of pile foundation.

[0026] 2, the utility model discloses a guide cylinder with proper height and weight is guided by adjusting the suspension steel wire tension, and a group of hydraulic deviation rectifying push rods are arranged on the peripheral wall of the guide cylinder, and a ratchet wheel is mounted at the end of the hydraulic deviation rectifying push rod. In addition to timely expansion and contraction in different directions to rectify the deviation and keep the verticality of the guide cylinder according to the deflection of the guide cylinder during tunneling, the ratchet wheel at the end of the hydraulic deviation rectifying push rod moderately cuts into the surrounding rock, and also has the effect of preventing the guide cylinder from rotating radially, so as to facilitate the winding device of the power oil pipe and the mud delivery pipeline to be connected to the ground main machine, greatly reducing the height of the main machine lifting frame, and making the main machine lighter and more suitable for water operation by using a floating platform on water.

[0027] 3, the utility model discloses the drill pipe axle of pile hole drilling machine is connected to the power transfer case box body through the spring buffer device of step setting upper end and lower end respectively, make the rotary drill pipe and its drill bit under impact be in suspended state, the spring can also play the role of reset after each impact, so as to keep the abutting state of the output device of impact hammer and the top end of drill pipe, and also play the role of protecting the high frequency impact hammer, avoiding damage caused by empty drilling. The spring buffer device adopts two layers of upper and lower overlapping springs with different elastic moduli, which has the effect of hitting the rock at the bottom of the pile hole under normal impact head state, and the drill pipe only moves up and down a little, and the steel wire supporting spring and the positioning spring are compressed to provide a moving space. At the same time, due to the small elastic modulus, the impedance generated by the impact is small, which is beneficial to improve the impact transmission efficiency. When the stratum appears a cavity or the tunneling device is lifted, the impact hammer impacts to make the drill pipe produce a larger displacement, and the annular spring is also compressed. Due to the large elastic modulus, a large impedance force is generated, which can avoid excessive displacement of the drill pipe and damage to the impact hammer caused by empty drilling.

[0028] 4、The pile hole drilling machine, the tunneling device adopts the upper and lower series type low speed large torque rotary hydraulic motor and the special impact hammer with the enlarged piston stroke, solves the impact-rotation power required by the efficient tunneling of the rock stratum. The multi-drill bit combination can adapt to the tunneling of larger diameter pile holes. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole structure schematic diagram of the drill rod type pile hole drilling machine in the embodiment 1 of the utility model.

[0030] Figure 2 It is a structure schematic diagram of the drill rod type pile hole drilling machine in the embodiment 1 of the utility model.

[0031] Figure 3 It is a structure schematic diagram of the drill rod type pile hole drilling machine in the embodiment 1 of the utility model. Figure 2 It is an enlarged schematic diagram of the upper half structure of the drill rod type pile hole drilling machine.

[0032] Figure 4 It is an enlarged schematic diagram of the lower half structure of the drill rod type pile hole drilling machine. Figure 2 It is an enlarged schematic diagram of the lower half structure of the drill rod type pile hole drilling machine.

[0033] Figure 5 It is an installation exploded schematic diagram of the rotary joint in the embodiment 1 of the utility model.

[0034] Figure 6 It is a transverse view of the impact-rotation drill bit in the embodiment 1 of the utility model.

[0035] Figure 7 It is a distribution schematic diagram of the drill bit in the embodiment 1 of the utility model.

[0036] Figure 8 It is a whole structure schematic diagram of the suspension type pile hole drilling machine in the embodiment 2 of the utility model.

[0037] Figure 9 It is a structure schematic diagram of the suspension type pile hole drilling machine in the embodiment 2 of the utility model.

[0038] Figure 10 It is an enlarged schematic diagram of the upper half structure of the suspension type pile hole drilling machine. Figure 9

[0039] It is an enlarged schematic diagram of the lower half structure of the suspension type pile hole drilling machine. Figure 11 Figure 9 It is an enlarged schematic diagram of the lower half structure of the suspension type pile hole drilling machine.

[0040] Figure 12 It is a top view at C-C in the embodiment 2. Figure 9

[0041] It is a tunneling schematic diagram using the prefabricated guide cylinder in the initial drilling in the embodiment 2. Figure 13 It is a tunneling schematic diagram using the prefabricated guide cylinder in the initial drilling in the embodiment 2.​

[0042] Figure 14 This is a schematic diagram of the slag discharge structure described in Example 3.

[0043] Figure 15 This is a schematic diagram of the drill bit distribution in Example 3.

[0044] In the diagram: 1. Multi-channel rotary sealing joint; 2. Hydraulic motor; 3. Lower flange of the lifting cylinder; 4. Seal; 5. Support bearing; 6. Lifting cylinder housing; 7. Lifting cylinder; 8. Cross lifting beam; 9. Rotary lifting ring; 10. Suspension wire rope; 11. Ratchet; 13. Upper flange of the lifting cylinder; 14. Flat bearing; 15. Slag discharge main pipe; 16. Flange; 17. Connecting hose; 18. Slag discharge rotary pipe; 19. Horizontal partition; 20. Hydraulic correction push rod; 21. Rotary sleeve flange; 22. Impact-rotary drill bit; 23. Drill rod; 24. Rotary sleeve; 25. Rotary sleeve sealing gasket; 26. Slag discharge branch pipe; 27. Slag discharge hole; 28. Sand suction pump sand discharge hose; 29. ​​Rotary sleeve support bearing; 30. Power transfer case; 31. Screw hole; 32. High-frequency impact device; 33. Through-hole spline hydraulic motor; 34. Intermediate connecting cylinder; 34'. Rotary joint protective cylinder; 35. Crossbeam; 36. Rigid drill rod; 37. Hydraulic motor bracket; 38. Rigid drill rod power motor; 39. Impact hammer protective cylinder; 40. Oil supply pipeline; 41. Multi-channel joint rotary sleeve support beam; 42. Spring buffer device. Detailed Implementation

[0045] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0046] Example 1: This example provides a high-frequency impact dual-rotary cutting type large-diameter pile hole drill, such as... Figures 1-7 As shown: a walking device and monitoring device with lifting equipment and power system, and an impact milling device driven by the lifting equipment. The impact milling device includes a vertical guide cylinder, a slag removal system, grouped impact-rotary drill bits 22 and their corresponding vertical high-frequency impact devices 32; the drive shafts of the impact-rotary drill bits in each group are connected by a power transfer box 30 set in the guide cylinder and are driven to rotate by the same power drive device; the high-frequency impact device is pushed against the top of the individual drill bit drive shaft by the spring buffer device 42 or the plunger cylinder. When the high-frequency impact device impacts up and down under power drive, it transfers the impact energy to the drill bit rotating under power drive.

[0047] The impact milling device in this embodiment is basically similar in structure and principle to the related patents previously filed by the inventor, and is not a major innovation of this application, so it will not be described in detail. This embodiment focuses on the main innovative parts of this application.

[0048] The basic principle of the embodiment is that the guide cylinder is connected with the lifting device by the rigid drill pipe 36, and the rotation is driven by the rigid drill pipe power motor 38 fixed to the ground by the hydraulic motor support 37; the percussion-rotation drill bit 22 rotates synchronously with the guide cylinder while being impacted and rotated, and performs double-rotation milling on the rock and soil.

[0049] The guide cylinder in the embodiment is composed of the intermediate connecting cylinder 34, the high-frequency percussion hammer protection cylinder 39 and the power distribution box 30 fixedly and sealingly connected.

[0050] As a preferred, the top of the rigid drill pipe 36 is provided with a multi-channel rotary sealing joint 1.

[0051] As shown in Figure 5 the bottom of the slag discharge branch pipe 26 of the slag discharge system is communicated with the slag discharge hole 27 in the center of the percussion-rotation drill bit 22 and the drill pipe 23 through the rotary sleeve 24 at the bottom end of the drill pipe 23, the slag discharge branch pipes of each drill bit are connected to the slag discharge main pipe 15 at the top of the percussion hammer protection cylinder 39, and the slag discharge main pipe 15 is connected with the ground sand pump slag discharge hose 28 through the multi-channel rotary sealing joint 1. More specifically, the rotary sleeve 24 is installed on the step at the lower end of the drill pipe 23 through the rotary sleeve support bearing 29, the rotary sleeve flange 21 and the rotary sleeve sealing gasket 25.

[0052] More specifically, the center of the percussion-rotation drill bit 22 is an internal hex structure, the bottom of the drill pipe 23 is an external hex structure, and both are provided with screw holes 31 for fixed connection.

[0053] As a preferred, the center of the rigid drill pipe and the fixed cross beam are hollow structures to set the slag discharge channel, oil pipeline and electrical circuit connected with the multi-channel rotary sealing joint 1.

[0054] As a preferred, the percussion-rotation drill bit includes a central drill bit and six peripheral drill bits distributed around the central drill bit, each two adjacent peripheral drill bits are driven by the same hydraulic motor 2, the central drill bit is driven by a through-hole spline hydraulic motor 33, the six peripheral drill bits rotate in the same direction, and the six peripheral drill bits are sequentially and interval distributed inside and outside, the centers of the outer three peripheral drill bits are located on a large concentric circle with the pile hole center as the center, the centers of the inner three peripheral drill bits are located on a small concentric circle with the pile hole center as the center, the rotation direction of the central drill bit is opposite to that of the peripheral drill bits, and since the six peripheral drill bits rotate in the same direction, the total friction force of the rock and soil during the percussion-rotation milling and excavation forms a torque rotating around the pile hole center, which drives the entire guide cylinder and the excavation device to rotate in the opposite direction around the pile hole center, as shown in Figure 6

[0055] ​As preferred, the joint on the top end face of the multi-channel rotary seal joint 1 is connected with external equipment, and the joint on the rotary sleeve is connected with the deslagging pipe and the hydraulic power component to ensure the deslagging and oil supply of the guide cylinder in the rotary state.

[0056] As preferred, the embodiment adopts a double-stacked low-rotational-speed high-torque multi-curve hydraulic motor in series in the up-down direction to increase the rotary power of the hydraulic motor in the compact guide frame space. The rotary gear box connected with the hydraulic motor power, the intermediate connecting cylinder 34, the impact hammer protection cylinder 39, and the power distribution box 30 adopt a filled cast steel box to increase the stability of the structure including the transmission drill pipe and related components under the impact energy and to facilitate the weight of the guide frame to meet the requirement of moderate drilling pressure.

[0057] As preferred, the embodiment increases the stroke of the piston rod of the high-frequency impact hammer on the basis of the existing breaking hammer to increase the output power of the impact hammer and meet the impact specific work of the lower teeth of the drill bit under the condition of the size limitation of the guide cylinder.

[0058] As preferred, the embodiment increases the drill bit groove and reasonably adjusts the number of lower teeth of the drill bit to meet the requirement of the impact specific work of the teeth within the limit of the power of the high-frequency impact hammer.

[0059] Embodiment 2: The high-frequency impact double rotary cutting and excavating large-diameter pile hole drill provided by the embodiment has a basic same impact milling device as the previous application patent, such as the spring buffer device 42 arranged at the upper and lower ends of the rotary impact drill pipe. The spring buffer device is composed of two layers of superimposed springs with different elastic moduli and thrust bearings. Similarly, the embodiment sets springs with different elastic moduli through the step of the drill pipe shaft, and the springs are placed on the power distribution box body, so that the rotary drill pipe and the drill bit subjected to impact are in a suspended state. After each impact, the spring can also play a resetting role. In this way, the impact hammer output device and the top end of the drill pipe are kept in abutting state, and the high-frequency impact device 32 is protected from damage caused by empty drilling. In order to solve the replacement of the impact contact surface, the top of the drill pipe uses a detachable drill pipe top connector. The top of the rotary-impact drill bit is screwed with an impact cap in the embodiment.

[0060] As preferred, the cylinder-piston control valve of the high-frequency impact device in the embodiment can prevent high-pressure slurry from entering the impact mechanism while transmitting impact energy through the impact pad with sealing, and particularly solves the problem of efficiency reduction of the high-frequency impact device under deep water operation. Compared with the embodiment 1, the main difference of the present embodiment is that the impact milling device and the guide cylinder are connected with the main machine lifting equipment through the suspension wire rope and the rotary bearing connector, and the rotary driving power of the guide cylinder is arranged symmetrically around the axis of the guide cylinder by the impact-rotary drill bit. Most of the drill bits rotate in the same direction, so that the guide cylinder and the tunneling device are subjected to circumferential rock-soil friction force, i.e. the circumferential rock-soil unbalanced friction force is used to drive the guide cylinder and the impact-rotary drill bit to revolve. Therefore, a few groups of impact-rotary drill bits are arranged symmetrically in rotation and their rotary directions are adjusted to generate a moderate unbalanced friction force symmetric to the axis. At the same time, the tension of the wire rope suspending the guide cylinder and the tunneling device is adjusted to implement gravity guidance.

[0061] The total weight of the guide cylinder and the tunneling device is set to meet the moderate pre-pressure of rock-soil drilling. In the deep pile hole drilling, the main machine lifting equipment avoids long rigid drill pipes and high landing gear, so that the equipment is lightened.

[0062] The suction pipe of the slag discharge system of the present embodiment is connected with the sand suction pump discharge hose through the rotary sealing joint and the total slag discharge pipe at the top of the impact hammer protection cylinder.

[0063] In order to better understand the above main difference, the above technical solutions will be described in detail below in combination with the drawings and specific embodiments. Figures 8-13

[0064] The guide cylinder of the present embodiment is suspended below the lifting equipment through the rotary hanger 9, and is arranged symmetrically around the axis of the guide cylinder by the impact-rotary drill bit 22 installed below the guide cylinder, and the circumferential rock-soil friction force generated by the same direction rotation drives the revolution. More specifically, the guide cylinder is suspended below the lifting equipment through the rotary hanger 9 installed below the suspension wire rope 10. The guide cylinder includes the rotary sealing joint protection cylinder 34', the intermediate connecting cylinder 34, the impact hammer protection cylinder 39 and the power distribution box 30 fixed and sealedly connected in an up-down manner.

[0065] ​The top of the rotary joint protection cylinder 34' is provided with a lifting cylinder assembly, which comprises a cross lifting beam 8, a lifting cylinder 7 and a lifting cylinder box 6. The top of the cross lifting beam 8 is connected with a rotary lifting ring 9, the lifting cylinder 7 has a half-longitudinal section in L shape, the upper end of the lifting cylinder 7 is inserted and fixed in the cross lifting beam 8, the lifting cylinder box 6 is sleeved on the lower end of the lifting cylinder 7, and is supported and limited by a lifting cylinder upper flange 13, a plane bearing 14 and a radial bearing 5, and is sealed by sealing elements 4 at the upper and lower positions respectively; the lifting cylinder box 6 is fixedly connected with the top end of the rotary sealing joint protection cylinder 34' through a lifting cylinder lower flange 3 and screws.

[0066] As preferred, the embodiment further comprises a transverse partition plate 19, which is in a hollow structure, the transverse partition plate 19 is welded to the bottom of the lifting cylinder 7, the rotary shaft part of the top of the multi-channel rotary sealing joint 1 is fixed with the transverse partition plate 19 through a rotary joint mounting flange 16, the bottom of the rotary sleeve below is fixed with a multi-channel joint rotary sleeve support beam 41, and the edge of the multi-channel joint rotary sleeve support beam 41 is fixed on the intermediate connecting cylinder 34.

[0067] The rotary sleeve part of the multi-channel rotary sealing joint in the embodiment of the utility model rotates synchronously with the guide cylinder, so that the pipes in the guide cylinder can be connected with the pipes of each drill bit, and the rotary shaft of the rotary joint is arranged above the top of the guide cylinder and connected with the corresponding slag discharge pipe and oil supply pipe. That is, the rotary sleeve of the multi-channel rotary sealing joint rotates synchronously downward with the guide cylinder, and the rotary shaft is exposed above the guide cylinder and fixed with the lifting cylinder, and the multiple interfaces of the rotary shaft are respectively connected with the slag discharge hose and the pressure oil hose leading to the ground. More specifically, the oil supply pipe 40 interface and the slag discharge pipe interface on the top end face of the multi-channel rotary sealing joint 1 are respectively connected with external equipment, the interface on the rotary sleeve is connected with the slag discharge pipe and the oil supply pipe of the hydraulic power component to ensure the slag discharge and oil supply of the guide cylinder in the revolution state.

[0068] As preferred, the bottom of the slag discharge branch pipe 26 of the slag discharge system is communicated with the slag discharge hole 27 in the center of the percussion-rotary drill bit 22 through the rotary sleeve 24 at the bottom end of the drill rod 23, the slag discharge branch pipes 26 of each drill bit converge to the slag discharge main pipe 15 at the top of the percussion hammer protection cylinder 39, the slag discharge main pipe is connected with the rotary pipe 18 at the bottom of the multi-channel rotary sealing joint 1 through the connecting hose 17, and then connected with the gravel pump slag discharge hose 28 on the ground through the multi-channel rotary sealing joint 1 to discharge the slag. The embodiment is adapted to underwater work, and adopts inflation to keep the pressure balance or micro-positive pressure between the inside and outside of the tunneling device protection cylinder, so as to prevent the mud from entering and seal and protect the components in the box.

[0069] As preferred, during construction, the guide cylinder is rotated while the hanging cylinder assembly is controlled not to rotate. Hydraulic deviation correction push rods 20 are installed on the periphery of the hanging cylinder, and the end of the hydraulic deviation correction push rod is used to push the ratchet 11 against the hole wall, so as to fix the hanging cylinder assembly in the center of the pile hole in the radial direction, so that it only moves in the axial direction. At the same time, during the impact rotary excavation process, the deviation of the guide cylinder in the vertical direction can be corrected by adjusting the pressure of the deviation correction push rod in different directions. Two sets of hydraulic deviation correction and rotation stopping push rods are arranged above and below, as shown in Figures 9-12 .

[0070] Example 3: The structure of the large-diameter pile hole drilling device in this example is basically the same as that in Example 1, and the impact rotary milling device and the guide cylinder thereof are connected with the main machine lifting equipment through a rigid drill rod. The difference is that this example does not install a multi-channel rotary sealing joint, and this example includes one central drill bit and five peripheral drill bits arranged symmetrically along the periphery of the central drill bit. The drill rod of each drill bit is driven by an independent through-hole hydraulic motor 33.

[0071] The rigid drill rod is driven by a power motor arranged on the ground to swing back and forth at a certain angle (such as 72 degrees) at a slow speed, and drives the impact rotary milling device and the guide cylinder thereof to swing back and forth around the center of the pile hole at the same angle at the same speed. During the swinging process, a group of drill bits of the impact rotary milling device swing back and forth around the center of the pile hole at a slow speed in addition to the impact rotation, constantly changing the position of the impact rotary milling, or timely replacing the position of the impact rotary milling at a certain angle, so as to make the impact rotary milling points of the drill bit teeth spread throughout the hole. Since the impact rotary milling device only swings back and forth at a certain angle, the oil pipe and the slag discharge pipe connected therewith swing back and forth at a certain amplitude, which can avoid the entanglement of the oil pipe and the slag discharge pipe under continuous rotation, and the multi-channel rotary sealing joint used in Example 1 is not needed to handle the connection problem of the oil pipe and the slag discharge pipe during continuous rotation. Compared with Example 1, each has its own advantages. This example can simplify and omit the multi-channel rotary sealing joint, but in the case of a large hole diameter, due to the limitation of the swinging angle, in order to ensure that the impact rotary milling points of the drill bit teeth spread throughout the hole, the number of impact rotary drill bits needs to be increased.

[0072] As shown in Figures 14-15 : In this example, the bottom of the slag discharge branch pipe 26 of the slag discharge system is close to the slag discharge hole 27 on the outer side of the drill rod on the upper surface of the impact-rotary drill bit 22. A communication groove is arranged between the upper surface and the bottom of the impact-rotary drill bit. The slag discharge branch pipe 26 of each drill bit converges to the slag discharge main pipe on the top of the power distribution box, which further simplifies the structure and saves the rotary sleeve. The slag discharge main pipe is directly connected with the sand pump slag discharge hose on the ground.

[0073] The above merely is the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled person in the art, without departing from the principles of the present application, can make a number of improvements, these improvements also should be considered as the protection scope of the present application.

Claims

1. A high-frequency impact double-rotary cutting drilling machine for large-diameter pile holes, comprising a walking device with a lifting device and a power system, and a monitoring device, an impact milling device driven by the lifting device, the impact milling device comprising a vertical guide cylinder, a slag removal system, a set of independent impact-rotary drill bits or grouped impact-rotary drill bits (22) and corresponding vertical high-frequency impact devices (32) arranged therefor, the independent impact-rotary drill bits being driven to rotate by independent power driving devices, the impact-rotary drill bits in each group being connected by a power distribution box (30) arranged in the guide cylinder and driven to rotate by the same power driving device, and the high-frequency impact device being pressed against the top of the single drill bit drive shaft under the pushing of a spring buffer device (42) or a plunger oil cylinder, and transmitting impact energy to the drill bit rotating under the power driving when the high-frequency impact device is driven to impact up and down, characterized in that: the guide cylinder is connected with the lifting device by a rigid drill rod (36), and is driven to rotate by a rigid drill rod power motor (38) arranged on the ground; or the guide cylinder is suspended below the lifting device by a rotary connecting piece, and is driven to revolve by the circumferential rock-soil friction force generated by the same-direction rotation of the impact-rotary drill bits symmetrically arranged around the axis of the guide cylinder; the impact-rotary drill bits rotate while impacting and synchronously revolve with the guide cylinder, and perform double-rotary milling on the rock-soil. The bottom of the slag removal branch pipe (26) of the slag removal system is communicated with the slag removal hole (27) in the center of the impact-rotary drill bit (22) through a rotating sleeve (24) at the bottom end of the transmission drill rod (23), and the slag removal branch pipes of the drill bits are connected to the slag removal main pipe (15) at the top of the protection cylinder of the high-frequency impact device. The bottom of the slag removal branch pipe (26) of the slag removal system is close to the outside of the drill rod on the upper surface of the impact-rotary drill bit (22), a communication groove is arranged between the upper surface and the bottom of the impact-rotary drill bit, and the slag removal branch pipes of the drill bits are connected to the slag removal main pipe (15) at the top of the protection cylinder of the high-frequency impact device. A multi-channel rotary sealing joint (1) is arranged at the top of the rigid drill rod (36), and the slag removal main pipe (15) is connected with the sand and stone pump slag removal hose on the ground through the multi-channel rotary sealing joint (1).

2. A high-frequency impact double-rotary boring piling hole drill according to claim 1, characterized in that: The slag removal main pipe (15) is connected with the sand and stone pump slag removal hose (28) on the ground, and the rigid drill rod power motor (38) drives the rigid drill rod (36) to link the guide cylinder to reciprocatingly rotate and swing at a preset angle, so as to realize double-rotary milling and make the impact-rotary milling points of the drill bit teeth spread throughout the hole.

3. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 1, characterized in that: The guide cylinder is connected with the lifting device by a rigid drill rod, and the rigid drill rod is in transmission connection with the output shaft of the rigid drill rod power motor arranged on the ground.

4. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 2, characterized in that: ​ 5. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 2, characterized in that: ​ 6. A high-frequency impact double-reaming, excavating, large-diameter pile hole drill according to claim 4 or 5, characterized in that: ​ The guide cylinder comprises a middle connecting cylinder (34) fixedly connected, an impact hammer protection cylinder (39) and a power distribution box (30), the top of the middle connecting cylinder (34) is fixedly provided with a cross beam (35), the cross beam (35) is fixedly connected with the bottom of the rigid drill rod (36), the center of the rigid drill rod and the cross beam is a hollow structure, the high-frequency impact device is arranged in the impact hammer protection cylinder (39), and the transmission shaft of the impact-rotary drill bit is arranged in the power distribution box (30).

7. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 3, characterized in that: The guide cylinder is hung below the lifting equipment through a rotating hanger ring (9) connected to a suspension wire rope (10); the guide cylinder is composed of a rotating sealing joint protection cylinder (34'), a middle connecting cylinder (34), an impact hammer protection cylinder (39) and a power distribution box (30) fixedly connected in sequence from top to bottom; The rotating sealing joint protection cylinder (34') is connected with a hanger cylinder assembly and a transverse partition plate (19) at the top, the hanger cylinder assembly comprises a cross hanger beam (8), a hanger cylinder (7) and a hanger cylinder box (6), the top of the cross hanger beam (8) is connected with the rotating hanger ring (9), the upper end of the hanger cylinder (7) is inserted and fixed in the cross hanger beam (8), the hanger cylinder box (6) is sleeved with the lower end of the hanger cylinder (7) and is supported and limited through a hanger cylinder upper flange (13), a plane bearing (14) and a radial bearing (5); the hanger cylinder box (6) is fixedly connected with the top of the rotating sealing joint protection cylinder (34'); The transverse partition plate (19) is fixed on the inner wall of the hanger cylinder, the top of the rotating shaft of the multi-channel rotating sealing joint (1) is fixed in the center of the transverse partition plate (19) through a flange (16), and the bottom of the rotating sleeve of the multi-channel rotating sealing joint (1) is fixed in the rotating sealing joint protection cylinder (34') through a support beam (41); The slag discharge main pipe (15) is connected with a gravel pump slag discharge hose (28) on the ground through the multi-channel rotating sealing joint (1).

8. A high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 7, characterized in that: A group of hydraulic deviation correction push rods (20) are arranged on the peripheral wall of the hanger cylinder (7), and a ratchet wheel (11) is arranged on the end of each hydraulic deviation correction push rod.

9. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 1, characterized in that: The impact-rotary drill bit comprises a center drill bit and a plurality of groups of peripheral drill bits which are rotationally symmetrically arranged around the center of the pile hole, two adjacent peripheral drill bits in each group are driven by a same hydraulic motor (2), the center drill bit is driven by a through-hole spline hydraulic motor (33), the plurality of groups of peripheral drill bits rotate in the same direction, the center drill bit rotates in the opposite direction, and the total friction force of the rock and soil forms a torque around the center of the pile hole in the process of impact-rotary milling and excavation, so as to drive the whole guide cylinder and the excavation device to revolve slowly around the center of the pile hole.

10. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 1, characterized in that: The impact-rotary drill bit comprises a center drill bit and N peripheral drill bits which are rotationally symmetrically arranged around the center of the pile hole, the center drill bit and the peripheral drill bits are independently driven by a through-hole spline hydraulic motor (33) respectively, and the angle of the rigid drill rod driving the guide cylinder to rotate and swing is 0~360° / N.

11. The high-frequency impact double-reaming digging large-diameter pile hole drill according to claim 7, characterized in that: The intermediate connecting cylinder (34), the impact hammer protection cylinder (39) and the power distribution box (30) are all sealed and connected, and the inside is filled with air to keep the internal and external pressure balanced or slightly positive to avoid mud and water from entering.

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