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

Abstract

The invention provides a high-frequency impact double-rotary-cutting tunneling type large-diameter pile hole drilling machine which comprises a walking device with lifting equipment and a power system, a monitoring device and an impact milling device driven by the lifting equipment 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 invention relates to a high-frequency impact double-rotating excavation type large-diameter pile hole drilling machine, which is suitable for constructing large-diameter cast-in-place piles in complex strata such as hard rocks, and belongs to the field of pile foundation equipment. Background Art

[0002] In the construction of large bridges and other projects, the machinery for constructing large-diameter cast-in-place piles in complex strata such as hard rock is inefficient and cost-effective. Existing equipment, including impact drills and rotary excavators, is more difficult to dig in medium-weathered or higher rock strata. This is a difficult problem in the construction of large bridges and other projects.

[0003] The applicant has applied for an invention patent "A suspended multi-drill bit rotary-impact combined excavation type engineering slotting machine" (application number: 20181065944330.X, utility model application at the same time, application number 201820980721.7). The invention relates to a suspended multi-drill bit rotary-impact combined excavation type engineering slotting machine, including a walking device and a monitoring device with a hoisting device and a power system; an impact milling device is suspended at the traction end of the hoisting device, and the impact milling device includes a vertical guide frame, a correction device, grouped drill bits and corresponding vertical high-frequency impact devices; the drill bit drive shafts in each group are connected through a power transfer box arranged on the box-shaped bottom beam or middle cross beam of the guide frame, and are driven to rotate by the same power drive device; the drill rod of the high-frequency impact device is pressed against the top of a single drill bit drive shaft, or against the top surface of a connecting cross beam connecting a group of drill bit drive shafts, under the push of a spring buffer device or a plunger cylinder. A set of connecting crossbeams of the drill drive shaft and the box-shaped bottom beam of the guide frame are movably connected through a set of suspension sliding devices. The slotting machine of the invention can efficiently complete the slotting operation of various complex strata including soil, rock, gravel, and boulders with good results. The trenching mechanism combining high-frequency impact and rotary milling is basically realized in the trenching process. It is characterized by the ability to open narrow and deep trenches, and the rock strata around the trench wall are intact and low in damage, which has important practical significance in foundation engineering.

[0004] During the engineering tests and practice of the tunneling slotting machine combining impact and rotary milling, the inventor of this application found that the tunneling mechanism combining high-frequency impact and rotary milling has great advantages in dealing with complex strata such as hard rock. However, the slotting machine can only form slots in a straight line, but cannot solve the problem of tunneling large pile holes. For this reason, this application further innovates and completes the innovative structure of the tunneling mechanism combining high-frequency impact and rotary milling in a large pile hole drilling machine, which can solve the problem of low construction efficiency of large-diameter cast-in-place piles in complex strata such as hard rock for large bridges and other projects. Summary of the invention

[0005] The present application provides a high-frequency impact dual-rotation excavation type large-diameter pile hole drilling rig, which solves a series of structural problems related to the power system of the impact rotary drill bit's revolution on the basis of the high-frequency impact-rotation mechanism, as well as a series of technical problems such as the corresponding processing of the slag discharge system in the revolution state, the processing of the pressure oil pipeline system, and the vertical guidance of the excavation device of multiple groups of drill bits in the state of combined rotation and revolution.

[0006] The present application provides a high-frequency impact double-turning excavation type large-diameter pile hole drilling machine, comprising a traveling device and a monitoring device with a lifting device and a power system, an impact milling device driven to rise and fall by the lifting device, the impact milling device comprising a vertical guide cylinder, a slag removal system, a group of independent impact-rotating drill bits or grouped impact-rotating drill bits and their corresponding vertical high-frequency impact devices; the independent impact-rotating drill bits are respectively driven to rotate by independent power drive devices, the grouped impact-rotating drill bits and their corresponding vertical high-frequency impact devices; the transmission shafts of the impact-rotating drill bits in each group are connected through a power transfer box arranged in the guide cylinder, and are driven to rotate by the same power drive device; the high-frequency impact device is pressed against the top of a single drill bit transmission shaft under the push of a spring buffer device or a plunger cylinder, and when the high-frequency impact device impacts up and down under power drive, the impact energy is transmitted to the drill bit rotating under power drive; the characteristics are: The guide cylinder is connected to the lifting device by a rigid drill rod and is driven to rotate by a rigid drill rod power motor arranged on the ground; Alternatively, the guide cylinder is suspended below the lifting device through a rotating connector, and is driven to revolve under the circumferential rock and soil friction force generated by the same-direction rotation of an impact-rotation drill bit installed below the guide cylinder and arranged rotationally symmetrically around the axis of the guide cylinder; The impact-rotation drill bit revolves synchronously with the guide cylinder while impacting and rotating, so as to perform dual rotation milling of self-rotation and revolution on rock and soil.

[0007] Furthermore, the bottom of the slag discharge branch pipe of the slag discharge system is connected to the slag discharge hole in the center of the impact-rotary drill bit through a rotating sleeve at the bottom end of the driving drill pipe, and the slag discharge branch pipes of each drill bit are connected to the slag discharge main pipe at the top of the impact hammer protective tube; Alternatively, the bottom of the slag discharge branch pipe of the slag discharge system is close to the outer side of the drill rod on the upper surface of the impact-rotary drill bit, a connecting groove is provided between the upper surface and the bottom of the impact-rotary drill bit, and the slag discharge branch pipes of each drill bit converge into the slag discharge main pipe at the top of the impact hammer protective tube.

[0008] Furthermore, a multi-channel rotary sealing joint is arranged on the top of the rigid drill pipe, and the slag discharge main pipe is connected with the slag discharge hose of the sand and gravel pump on the ground through the multi-channel rotary sealing joint.

[0009] Furthermore, the slag discharge main pipe is connected to the slag discharge hose of the sand and gravel pump on the ground; the rigid drill pipe power motor drives the rigid drill pipe linked guide cylinder to reciprocate and swing at a preset angle to achieve double rotary milling and make the drill bit teeth impact rotary milling points throughout the hole.

[0010] Furthermore, the guide cylinder is connected to the lifting device by a rigid drill rod, and the rigid drill rod is drivingly connected to an output shaft of a rigid drill rod power motor disposed on the ground; The guide cylinder includes an intermediate connecting cylinder, an impact hammer protection cylinder and a power transfer case which are fixedly and sealedly connected. A crossbeam is fixedly arranged on the top of the intermediate connecting cylinder. The crossbeam is fixedly connected to the bottom of the rigid drill rod. The centers of the rigid drill rod and the crossbeam are both hollow structures. The high-frequency impact device is arranged in the impact hammer protection cylinder, and the transmission shaft of the impact-rotating drill bit is arranged in the power transfer case.

[0011] Furthermore, the guide cylinder is suspended under the lifting device through a rotating ring connected to the suspension wire rope; the guide cylinder is composed of a rotating sealing joint protective cylinder, an intermediate connecting cylinder, an impact hammer protective cylinder and a power transfer case which are fixedly sealed and connected up and down.

[0012] A hanging tube assembly and a transverse partition are connected to the top of the rotary sealing joint protective tube. The hanging tube assembly includes a cross hanging beam, a hanging tube and a hanging tube box. The top of the cross hanging beam is connected to the rotary hanging ring. The upper end of the hanging tube is inserted and fixed in the cross hanging beam. The hanging tube box is sleeved on the lower end of the hanging tube and is supported and limited by the upper flange of the hanging tube, the plane bearing and the radial support bearing; the hanging tube box is fixedly connected to the top of the rotary sealing joint protective tube.

[0013] The transverse partition is fixed on the inner wall of the hanging tube, and the rotating shaft of the multi-channel rotary sealing joint is fixed to the mounting hole in the center of the transverse partition through the rotary joint mounting flange, and each joint of the rotary shaft is connected to the external equipment with a hose. The rotating sleeve of the multi-channel rotary sealing joint is fixed in the rotary joint protective cylinder through the multi-channel joint rotary sleeve support beam. Each oil pipe passes through the gap of the support beam and is connected to the relevant oil nozzle. The upper and lower slag discharge rotary pipe interfaces in the center of the multi-channel joint are connected to the slag discharge pipe with a hose. Even with high-frequency vibration, slag discharge and oil supply can be normal. The slag discharge main pipe is connected to the slag discharge hose of the sand and gravel pump on the ground through the multi-channel rotary sealing joint.

[0014] Furthermore, a group of hydraulic deviation correction push rods are arranged on the peripheral wall of the hanging barrel, and ratchets are installed on the ends of the hydraulic deviation correction push rods. The outer sleeve of the multi-channel rotary sealing joint rotates synchronously with the impact hammer protection cylinder, and the top of the inner shaft of the multi-channel rotary sealing joint is fixedly connected to the hanging barrel box.

[0015] The hydraulic correction push rod not only retracts and contracts in different directions to correct the guide cylinder to maintain its verticality during excavation, but also has a ratchet at its end that moderately cuts into the surrounding rocks to prevent the suspension cylinder from rotating. The suspension cylinder only slides vertically downward following the guide cylinder without rotating in the circumferential direction, so as to facilitate the connection of the power oil pipe and mud delivery pipeline to the winding device of the ground host.

[0016] Furthermore, the impact-rotary drill bit includes a center drill bit and multiple groups of peripheral drill bits rotationally symmetrically distributed around the center of the pile hole, two adjacent peripheral drill bits in each group are driven by the same hydraulic motor, and the center drill bit is driven by a through-spline hydraulic motor, the multiple groups of rotationally symmetrically distributed peripheral drill bits rotate in the same direction, and the center drill bit rotates in opposite directions to the peripheral drill bits. Since the multiple groups of peripheral drill bits rotate in the same direction, during the impact rotary milling and excavation process, the total friction force of the rock and soil forms a torque rotating around the center of the pile hole, driving the entire guide cylinder and its excavation device to slowly revolve around the center of the pile hole.

[0017] Furthermore, the impact-rotary drill bit includes a center drill bit and N peripheral drill bits 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-spline hydraulic motor respectively. The rigid drill rod drives the guide cylinder to rotate and swing at an angle of 0~360° / N.

[0018] Furthermore, in order to adapt to underwater operations, inflation is adopted in the sealing guide cylinder and the box to maintain internal and external pressure balance or slight positive pressure, and the components in the guide cylinder of the box are sealed and protected to prevent mud and water from entering.

[0019] The technical solution provided by this application has at least the following technical effects or advantages: The present invention realizes the high-frequency impact-rotation milling mechanism of the full cross-section of the pile hole The rock excavation efficiency is improved, and various rock formations including hard rock formations can be handled. The present invention uses two different methods: a rigid drill rod power motor set on the ground drives the rotation, or a plurality of groups of impact-rotation drill bits arranged symmetrically around the axis of the guide tube rotate in the same direction and drive the circumferential rock and soil friction force to revolve, thereby solving the revolving problem of the guide tube and its impact-rotation excavation device that are raised and lowered by the rigid drill rod or suspended by the wire rope, so that the impact-rotation action points are distributed throughout the hole. At the same time, the multi-channel rotary sealing device solves the slag discharge problem of the excavation device under the revolving state, and the layout of the power oil pipeline realizes efficient mud reverse circulation slag discharge under high-frequency impact double-rotation milling state, solving the problem of pile hole excavation in complex formations. High-frequency and moderate impact reaches the critical value of rock crushing. While drilling efficiently, it can maintain the integrity of the rocks around the hole wall and improve the bearing capacity of the pile foundation. In particular, the integrity of the surrounding rocks ensures the lateral bearing capacity of the pile. This is of great significance in the construction of cable-stayed bridges and other projects. It can cope with large lateral tensions and greatly save the amount and cost of pile foundation projects.

[0020] 2. The present invention adopts a guide cylinder with appropriate height and weight to adjust the tension of the suspension wire fly for gravity guidance. At the same time, a group of hydraulic correction push rods are arranged on the peripheral wall of the suspension cylinder, and the end of the hydraulic correction push rod is installed with a ratchet. In addition to timely stretching and correcting the guide cylinder in different directions according to the deflection of the guide cylinder during the excavation process to maintain the verticality of the guide cylinder, the ratchet at the end of the hydraulic correction push rod moderately cuts into the surrounding rocks and also has the function of preventing the radial rotation of the suspension cylinder, so as to facilitate the connection of the power oil pipe and the mud conveying pipeline to the winding device of the ground main engine, greatly reducing the height of the main engine hoisting frame, making the main engine lighter and more suitable for water operations using a floating platform on the water.

[0021] 3. The upper and lower ends of the drill rod shaft of the pile hole drilling machine of the present invention are connected to the power transfer box body through the step-arranged spring buffer device, so that the impacted rotary drill rod and its drill bit are in a suspended state. After each impact, the spring can also play a role of resetting, thereby maintaining the contact state between the output device of the impact hammer and the top of the drill rod, and protecting the high-frequency impact hammer from damage caused by empty hitting; the spring buffer device adopts two layers of springs with different elastic moduli overlapping on the upper and lower sides, and its function is to hit the rock at the bottom of the pile hole in the normal impact head state. The drill rod only moves up and down a small amount. The steel wire support spring and the positioning spring are compressed to provide a moving space. At the same time, due to its small elastic modulus, the impedance generated by the impact is very small, so as to improve the impact transmission efficiency. When there is a cavity in the local layer or the excavation device is lifted, the impact of the impact hammer causes a large displacement of the drill rod, and the annular spring is also subjected to a large compression. Because of its large elastic modulus, it will generate a large impedance force, which can avoid excessive displacement of the drill rod and will not cause damage to the impact hammer due to empty hitting.

[0022] 4. The pile hole drilling machine of the present invention adopts a rotary hydraulic motor with low speed and high torque in series and a special impact hammer with a large piston stroke, which solves the impact-rotation power required for efficient excavation of rock formations. The multi-drill bit combination can adapt to the excavation of pile holes with larger diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the drill rod type pile hole drilling rig in Example 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the drill rod type piling rig in Example 1 of the present application.

[0025] Figure 3 This is a schematic diagram of the exploded installation of the rotary joint in Example 1 of the present application.

[0026] Figure 4 This is a cross-sectional view of the impact-rotary drill bit in Example 1 of the present application.

[0027] Figure 5 This is a schematic diagram of the distribution of the drill bits in Example 1 of the present application.

[0028] Figure 6 This is a schematic diagram of the overall structure of the suspended pile hole drilling rig in Example 2 of the present application.

[0029] Figure 7 This is a schematic diagram of the structure of the suspended piling drilling rig in Example 2 of the present application.

[0030] Figure 8 for Figure 7 Top view of the center CC.

[0031] Fig. 9 Schematic diagram of excavation using a prefabricated guide tube during initial drilling in Example 2.

[0032] Fig.10 This is a schematic diagram of the slag discharge structure described in Example 3.

[0033] Fig.11 This is a schematic diagram of drill bit distribution in Example 3.

[0034] In the figure: 1. Multi-channel rotary sealing joint; 2. Hydraulic motor; 3. Bottom flange of hanging tube; 4. Seal; 5. Support bearing; 6. Hanging tube box; 7. Hanging tube; 8. Cross hanging beam; 9. Rotating lifting ring; 10. Suspension wire rope; 11. Ratchet; 13. Upper flange of hanging tube; 14. Plane bearing; 15. Mud discharge main pipe; 16. Flange; 17. Connecting hose; 18. Mud discharge rotary pipe; 19. Horizontal partition; 20. Hydraulic deviation correction push rod; 21. Rotating sleeve flange; 22. Impact-rotating drill bit; 23. Drill rod; 24. Rotating 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 supporting bearing; 30. Power transfer case; 31. Screw hole; 32. High-frequency impact device; 33. Through-heart spline hydraulic motor; 34. Intermediate connecting tube; 34', rotary joint protective tube; 35. Crossbeam; 36. Rigid drill pipe; 37. Hydraulic motor bracket; 38. Rigid drill pipe power motor; 39. Impact hammer protective tube; 40. Oil supply pipeline; 41. Multi-channel joint rotary sleeve support beam; 42. Spring buffer device. DETAILED DESCRIPTION

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Example

[0036] This embodiment provides a high-frequency impact double-turning excavation type large-diameter pile hole drill, such as Figure 1-Figure 5 As shown: it includes a walking device and a monitoring device with a lifting device and a power system, an impact milling device driven to rise and fall by the lifting device, and the impact milling device includes a vertical guide cylinder, a slag removal system, grouped impact-rotating drill bits 22 and a corresponding vertical high-frequency impact device 32; the transmission shafts of the impact-rotating drill bits in each group are connected through a power transfer box 30 arranged in the guide cylinder, and are driven to rotate by the same power drive device; the high-frequency impact device is pressed against the top of a single drill bit transmission shaft under the push of a spring buffer device 42 or a plunger cylinder, and when the high-frequency impact device impacts up and down under power drive, the impact energy is transmitted to the drill bit rotating under power drive.

[0037] The impact milling device of this embodiment is basically similar to the structure and principle of the related patent previously applied by the inventor, and is not the main innovation of this application, so it will not be described in detail. This embodiment focuses on the main innovative part of this application.

[0038] The basic principle of this embodiment is that the guide cylinder is connected to the lifting equipment with a rigid drill rod 36, and is driven to rotate by a rigid drill rod power motor 38 fixed to the ground by a hydraulic motor bracket 37; the impact-rotation drill bit 22 revolves synchronously with the guide cylinder while impacting and rotating, performing dual rotation and revolution milling on the rock and soil.

[0039] The guide cylinder in this embodiment is composed of an intermediate connecting cylinder 34, a high-frequency impact hammer protection cylinder 39 and a power transfer case 30, which are fixedly connected to each other in a sealed manner. A crossbeam 35 is fixedly arranged on the top of the intermediate connecting cylinder 34, and the crossbeam 35 is fixedly connected to the bottom of the rigid drill rod 36.

[0040] Preferably, a multi-channel rotary sealing joint 1 is provided on the top of the rigid drill pipe 36 .

[0041] like Figure 3 As shown in the figure, the bottom of the slag discharge branch pipe 26 of the slag discharge system is connected to the impact-rotation drill bit 22 and the slag discharge hole 27 in the center of the drill rod 23 through the rotating sleeve 24 at the bottom end of the drill rod 23, and the slag discharge branch pipes of each drill bit are connected to the slag discharge main pipe 15 at the top of the impact hammer protection tube 39, and the slag discharge main pipe 15 is connected to the slag discharge hose 28 of the sand and gravel pump on the ground through the multi-channel rotary sealing joint 1. More specifically, the rotating sleeve 24 is installed and limited on the step at the lower end of the drill rod 23 through the rotating sleeve support bearing 29, the rotating sleeve flange 21 and the rotating sleeve sealing gasket 25.

[0042] More specifically, the center of the impact-rotation drill bit 22 of this embodiment is an inner hexagonal structure, and the bottom of the drill rod 23 is an outer hexagonal structure, and both are provided with screw holes 31 for fixed connection between the two.

[0043] Preferably, the centers of the rigid drill pipe and the fixed crossbeam are hollow structures to provide a slag discharge channel, an oil pipeline line and an electrical line connected to the multi-channel rotary sealing joint 1 .

[0044] Preferably, the impact-rotary drill bit includes a center drill bit and 6 peripheral drill bits distributed around the center drill bit, every two adjacent peripheral drill bits are driven by the same hydraulic motor 2, the center drill bit is driven by a through-spline hydraulic motor 33, the 6 peripheral drill bits rotate in the same direction, and the 6 peripheral drill bits are sequentially spaced inside and outside, and the centers of the three outer peripheral drill bits are located on a large concentric circle with the center of the pile hole as the center, and the centers of the three inner peripheral drill bits are located on a small concentric circle with the center of the pile hole as the center, and the center drill bit and the peripheral drill bits rotate in opposite directions. Since the 6 peripheral drill bits rotate in the same direction, during the impact rotary milling excavation process, the total friction force of the rock and soil forms a torque rotating around the center of the pile hole, driving the entire guide cylinder and its excavation device to rotate slowly in the opposite direction around the center of the pile hole, such as Figure 4 shown.

[0045] Preferably, the joint on the top end face of the multi-channel rotary sealing joint 1 is connected to external equipment, and the joint on its rotary sleeve is connected to the slag discharge pipe and the hydraulic power component to ensure slag discharge and oil supply of the guide cylinder in a rotating state.

[0046] As a preferred embodiment, this embodiment adopts a double stacked low-speed high-torque multi-curve hydraulic motor connected in series, so as to increase the rotary power of the hydraulic motor in a compact guide frame space. The rotary gear box, the intermediate connecting tube 34, the impact hammer protection tube 39 and the power transfer box 30 connected to the hydraulic motor power adopt a filled cast steel box body to increase the stability of the structure including the transmission drill rod and related components in the impact energy transmission and facilitate the weight of the guide frame to achieve the need for moderate drilling pressure.

[0047] As a preferred embodiment, under the condition of the space size limitation of the guide tube, in order to increase the output power of the impact hammer and meet the impact power ratio of the lower cutter of the drill bit, the high-frequency impact hammer is modified on the basis of the existing breaker hammer to increase the stroke of the piston rod. In order to adapt to underwater operations, the sealed guide tube box is inflated to maintain the internal and external pressure balance or slightly positive pressure to prevent muddy water from entering, and the components in the guide tube of the box are sealed and protected.

[0048] As a preferred embodiment, within the power limit of the high-frequency impact hammer, in order to meet the requirements of the impact power ratio of the cutter teeth, the drill groove is enlarged and the number of cutter teeth under the drill bit is reasonably adjusted. Example

[0049] The present embodiment provides a high-frequency impact double-turning excavation type large-diameter pile hole drill, and the impact milling device is basically the same as the embodiment 1 and the prior patent application, such as including a spring buffer device 42 arranged at the upper and lower ends of the rotary impact drill rod, and the spring buffer device is composed of two overlapping layers of springs with different elastic moduli and thrust bearings. Similarly, in the present embodiment, springs with different elastic moduli are arranged through the steps of the drill rod shaft, and are placed on the top of the power transfer case body, so that the impacted rotary drill rod and its drill bit are in a suspended state, and the spring can play a role of reset after each impact, thereby maintaining the contact state between the impact hammer output device and the top of the drill rod, and protecting the high-frequency impact device 32 from damage due to empty hitting. In order to solve the damage and replacement of the impact contact surface, a detachable drill rod top connector is used at the top of the drill rod. In the present embodiment, the top of the rotary-impact drill bit is screwed with an impact cap through a thread.

[0050] As a preferred embodiment, the cylinder piston control valve of the high-frequency impact device in this embodiment can prevent high-pressure muddy water from entering the impact mechanism while transmitting impact energy through a sealed impact pad, especially solving the problem of reduced efficiency of the high-frequency impactor in deep-water operations. Compared with Example 1, the main difference of this example is that the impact milling device and its guide cylinder are connected to the main lifting equipment through a slewing bearing connector by a suspended wire rope, and the rotary driving power of the guide cylinder is that the impact-rotating drill bits are arranged symmetrically around the axis of the guide cylinder, and most of the drill bits rotate in the same direction, so that the guide cylinder and its excavation device are subjected to circumferential rock and soil friction, that is, the circumferential rock and soil unbalanced friction is used to drive the guide cylinder and its impact-rotating drill bits to revolve. For this reason, the structure is combined with several groups of impact-rotating drill bits in a rotationally symmetrical arrangement and the rotation direction is adjusted to generate a moderate unbalanced friction force symmetrical to the axis; at the same time, the tension of the wire rope suspending the guide cylinder and the excavation device therein is appropriately adjusted to implement gravity guidance.

[0051] The total weight of the guide tube and the excavation device therein is set to meet the appropriate pre-pressure of rock drilling. In this example, the main lifting equipment avoids the long rigid drill rod and high landing gear in the deep pile hole drilling, making the equipment light.

[0052] The slag suction pipe of the slag discharge system in this example goes upward from the top of each drill bit through the side gap of the gear box, and converges at the slag discharge main pipe on the top of the impact hammer protective tube and upwardly connects to the sand suction pump sand discharge hose through a rotary sealing joint.

[0053] In order to better understand the above main differences, the following will be combined with the instructions Figure 6-Figure 9 The above technical solution is described in detail with reference to the figures and specific implementation methods.

[0054] The guide cylinder of the present embodiment is suspended below the lifting device through a rotating lifting ring 9, and is driven to revolve by the circumferential rock and soil friction force generated by the impact-rotating drill bit 22 installed below the guide cylinder, which is arranged rotationally symmetrically around the axis of the guide cylinder and rotates in the same direction; more specifically, the guide cylinder is suspended below the lifting device through a rotating lifting ring 9 installed under the suspension wire rope 10; the guide cylinder includes a rotating sealing joint protective cylinder 34', an intermediate connecting cylinder 34, an impact hammer protective cylinder 39 and a power transfer case 30 that are fixedly sealed and connected above and below.

[0055] A hanging tube assembly is installed on the top of the rotary joint protection tube 34', and the hanging tube assembly includes a cross hanging beam 8, a hanging tube 7 and a hanging tube box 6. Among them, the top of the cross hanging beam 8 is connected to the rotary lifting ring 9, the semi-longitudinal section of the hanging tube 7 is L-shaped, and its upper end is inserted and fixed in the cross hanging beam 8, and the hanging tube box 6 is sleeved on the lower end of the hanging tube 7, and is supported and limited by the hanging tube upper flange 13, the plane bearing 14 and the radial support bearing 5, and the upper and lower parts are sealed respectively by the seal 4; the hanging tube box 6 is fixedly connected to the top of the rotary sealing joint protection tube 34' through the hanging tube lower flange 3 and screws.

[0056] Preferably, the present embodiment also includes a transverse partition 19, which is a hollow structure and is welded to the bottom of the hanging tube 7. The rotating shaft portion at the top of the multi-channel rotary sealing joint 1 is fixed to the transverse partition 19 through the rotary joint mounting flange 16, and the bottom of the rotating sleeve below it is fixed to the multi-channel joint rotary sleeve support beam 41, and the edge of the multi-channel joint rotary sleeve support beam 41 is fixed to the middle connecting tube 34.

[0057] The rotating sleeve of the multi-channel rotary sealing joint in the embodiment of the present invention rotates synchronously with the guide cylinder, so that the pipeline in the guide cylinder can be connected to each drill pipe correspondingly, and the rotating shaft of the rotary joint is arranged above the top of the guide cylinder and connected to the corresponding slag discharge pipe and the oil supply pipe. In other words, the rotating sleeve of the multi-channel rotary sealing joint is facing downward, fixed and synchronously rotated with the guide cylinder, and part of the rotating shaft is exposed above the guide cylinder and fixed to the hanging cylinder, and its multiple interfaces are respectively connected to the slag discharge hose and the pressure oil hose leading to the ground. More specifically, the oil supply pipeline 40 interface and the slag discharge pipe interface on the top end face of the multi-channel rotary sealing joint 1 are respectively connected to external equipment, and the joint on the rotary sleeve is connected to 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 orbital state.

[0058] As a preferred embodiment, the bottom of the slag discharge branch pipe 26 of the slag discharge system is connected to the slag discharge hole 27 in the center of the impact-rotating drill bit 22 through the rotating sleeve 24 at the bottom of the drill rod 23, and the slag discharge branch pipes 26 of each drill bit are connected to the slag discharge main pipe 15 at the top of the impact hammer protective tube 39. The slag discharge main pipe is connected to the rotating pipe 18 at the bottom of the multi-channel rotary sealing joint 1 through the connecting hose 17, and then connected to the slag discharge hose 28 of the sand and gravel pump on the ground through the multi-channel rotary sealing joint 1 for slag discharge. This embodiment is suitable for underwater work, and inflation is adopted to keep the pressure inside and outside the protective tube of the excavation device balanced or slightly positive to prevent mud and water from entering, and to seal and protect the components in the box.

[0059] As a preferred method, during construction, it is necessary to control the suspension barrel assembly not to rotate but the guide barrel to rotate. A hydraulic correction push rod 20 is installed around the suspension barrel. The ratchet 11 at the end of the hydraulic correction push rod is pressed against the hole wall to radially fix the suspension barrel assembly at the center of the pile hole so that it can only move axially. At the same time, during the impact rotary excavation process, the deviation of the guide barrel in the vertical direction can be corrected by adjusting the pressure of the correction push rod in different directions. Two sets of hydraulic correction anti-rotation push rods are set up at the top and bottom, such as Figure 7 , Figure 8 shown. Example

[0060] The high-frequency impact double-turning excavation type large-diameter pile hole drilling structure in this example is basically the same as that in Example 1, and the impact rotary milling device and its guide cylinder are connected to the main engine lifting device by a rigid drill rod. The difference is that this example does not install a multi-channel rotary sealing joint, and this example includes a center drill bit and five peripheral drill bits arranged rotationally symmetrically around the center drill, and the drill rod of each drill bit is driven by an independent through-the-center spline hydraulic motor 33.

[0061] The rigid drill rod is driven by a power motor installed on the ground to slowly reciprocate and swing at a certain angle (such as 72 degrees), driving the impact rotary milling device and its guide cylinder to synchronously rotate and swing at the same angle around the center of the pile hole. During the swinging process, a group of drill bits of the impact rotary milling device, in addition to impact rotation, are slowly rotated and swung around the center of the pile hole, constantly changing the position of the impact rotary milling, or reciprocatingly changing the position of the impact rotary milling at a certain angle in a timely manner, so that the impact rotary milling action points of the drill bit teeth are spread throughout the hole. Since the impact rotary milling device only reciprocates and swings at a certain angle, the oil pipe and the slag discharge pipe connected to it swing back and forth with a certain amplitude, which can prevent the oil pipe and the slag discharge pipe from being twisted under continuous rotation, and there is no need to use a multi-channel rotary sealing joint as in Example 1 to deal with 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. However, in the case of large hole diameters, due to the limitation of the swing angle, in order to ensure that the impact rotary milling action points of the drill teeth are distributed throughout the hole, it is necessary to increase the number of impact rotary drill bits.

[0062] like Figure 10-11 As shown: the bottom of the slag discharge branch pipe 26 of the slag discharge system in this embodiment is close to the slag discharge hole 27 on the outside of the drill rod on the upper surface of the impact-rotary drill bit 22, and a connecting groove is provided between the upper surface and the bottom of the impact-rotary drill bit. The slag discharge branch pipes 26 of each drill bit converge to the slag discharge main pipe on the top of the power transfer case, which further simplifies the structure and eliminates the rotating sleeve. The slag discharge main pipe is directly connected to the slag discharge hose of the sand and gravel pump on the ground.

[0063] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A high-frequency impact double-turning excavation type large-diameter pile hole drilling machine, comprising a traveling device and a monitoring device with a lifting device and a power system, an impact milling device driven to rise and fall by the lifting device, the impact milling device comprising a vertical guide cylinder, a slag removal system, a group of independent impact-rotating drill bits or grouped impact-rotating drill bits (22) and a corresponding vertical high-frequency impact device (32); the independent impact-rotating drill bits are respectively driven to rotate by independent power drive devices, the transmission shafts of the impact-rotating drill bits in each group are connected via a power transfer box (30) arranged in the guide cylinder, and are driven to rotate by the same power drive device; the high-frequency impact device is pressed against the top of a single drill bit transmission shaft under the push of a spring buffer device (42) or a plunger cylinder, and when the high-frequency impact device impacts up and down under power drive, the impact energy is transmitted to the drill bit rotating under power drive; the characteristics are: The guide cylinder is connected to the lifting device via a rigid drill rod (36) and is driven to rotate by a rigid drill rod power motor (38) disposed on the ground; Alternatively, the guide cylinder is suspended below the lifting device via a rotating connection (9), and is driven to revolve under the circumferential rock and soil friction force generated by the same-direction rotation of an impact-rotation drill bit installed below the guide cylinder and arranged rotationally symmetrically around the axis of the guide cylinder; The impact-rotation drill bit revolves synchronously with the guide cylinder while impacting and rotating, so as to perform dual rotation milling of self-rotation and revolution on rock and soil.

2. The high-frequency impact double-turning excavation type large-diameter pile hole drilling rig according to claim 1 is characterized in that: The bottom of the slag discharge branch pipe (26) of the slag discharge system is connected to the slag discharge hole (27) at the center of the impact-rotating drill bit (22) through the rotating sleeve (24) at the bottom end of the driving drill rod (23), and the slag discharge branch pipes of each drill bit are connected to the slag discharge main pipe (15) at the top of the impact hammer protective tube; Alternatively, the bottom of the slag discharge branch pipe (26) of the slag discharge system is close to the outer side of the drill rod on the upper surface of the impact-rotary drill bit (22), a connecting groove is provided between the upper surface and the bottom of the impact-rotary drill bit, and the slag discharge branch pipes of each drill bit are connected to the slag discharge main pipe (15) at the top of the impact hammer protective tube.

3. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 2 is characterized in that: A multi-channel rotary sealing joint (1) is provided at the top of the rigid drill rod (36), and the slag discharge main pipe (15) is connected to the slag discharge hose of the sand and gravel pump on the ground through the multi-channel rotary sealing joint (1).

4. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 2 is characterized in that: The slag discharge main pipe (15) is connected to the slag discharge hose (28) of the sand and gravel pump on the ground; the rigid drill rod power motor (38) drives the rigid drill rod (36) to link with the guide cylinder to reciprocate and swing at a preset angle, so as to realize double rotary milling and make the impact points of the drill bit teeth for rotary milling spread throughout the entire hole.

5. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 3 or 4, characterized in that: The guide cylinder is connected to the lifting device by a rigid drill rod, and the rigid drill rod is drivingly connected to an output shaft of a rigid drill rod power motor disposed on the ground; The guide cylinder comprises an intermediate connecting cylinder (34), an impact hammer protection cylinder (39) and a power transfer case (30) which are fixedly and sealedly connected. A crossbeam (35) is fixedly arranged on the top of the intermediate connecting cylinder (34). The crossbeam (35) is fixedly connected to the bottom of the rigid drill rod (36). The centers of the rigid drill rod and the crossbeam are both hollow structures. The high-frequency impact device is arranged in the impact hammer protection cylinder (39), and the transmission shaft of the impact-rotating drill bit is arranged in the power transfer case (30).

6. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 2 is characterized in that: The guide cylinder is suspended below the lifting device through a rotating lifting ring (9) connected to a suspension wire rope (10); the guide cylinder is composed of a rotating sealing joint protection cylinder (34') fixedly sealed and connected up and down, an intermediate connecting cylinder (34), an impact hammer protection cylinder (39) and a power transfer case (30); The top of the rotary seal joint protective cylinder (34') is connected to a hanging cylinder assembly and a transverse partition (19), the hanging cylinder assembly comprises a cross hanging beam (8), a hanging cylinder (7) and a hanging cylinder box (6), the top of the cross hanging beam (8) is connected to the rotary hanging ring (9), the upper end of the hanging cylinder (7) is inserted and fixed in the cross hanging beam (8), the hanging cylinder box (6) is sleeved on the lower end of the hanging cylinder (7), and is supported and limited by the hanging cylinder upper flange (13), the plane bearing (14) and the radial support bearing (5); the hanging cylinder box (6) is fixedly connected to the top of the rotary seal joint protective cylinder (34'); The transverse partition (19) is fixed to the inner wall of the hanging tube, the top of the rotating shaft of the multi-channel rotary sealing joint (1) is fixed to the center of the transverse partition (19) through a flange (16), and the bottom of the rotating sleeve of the multi-channel rotary sealing joint (1) is fixed in the rotary sealing joint protective tube (34') through a support beam (41); The slag discharge main pipe (15) is connected to the slag discharge hose (28) of the sand and gravel pump on the ground through the multi-channel rotary sealing joint (1).

7. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 6 is characterized in that: A group of hydraulic deviation correction push rods (20) are arranged on the peripheral wall of the suspension cylinder (7), and ratchets (11) are installed on the ends of the hydraulic deviation correction push rods.

8. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 1, characterized in that: The impact-rotation drill bit comprises a center drill bit and a plurality of groups of peripheral drill bits that are rotationally symmetrically distributed around the center of the pile hole. Two adjacent peripheral drill bits in each group are driven by the same hydraulic motor (2), and the center drill bit is driven by a through-spline hydraulic motor (33). The plurality of groups of peripheral drill bits rotate in the same direction, and the center drill bit rotates in opposite directions to the peripheral drill bits. Since the plurality of groups of peripheral drill bits rotate in the same direction, during the impact-rotation milling excavation process, the total friction force of the rock and soil forms a torque that rotates around the center of the pile hole, driving the entire guide cylinder and its excavation device to slowly revolve around the center of the pile hole.

9. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 1, characterized in that: The impact-rotating drill bit comprises a central drill bit and N peripheral drill bits that are rotationally symmetrically arranged around the center of the pile hole. The central drill bit and the peripheral drill bits are independently driven by a through-spline hydraulic motor (33) respectively. The rigid drill rod drives the guide tube to rotate and swing at an angle of 0 to 360° / N.

10. The high-frequency impact double-turning excavation type large-diameter pile hole drilling machine according to claim 5 or 6, characterized in that: The intermediate connecting tube (34), the impact hammer protection tube (39) and the power transfer case (30) are all sealed and connected, and the inside is inflated to maintain internal and external pressure balance or a slight positive pressure to prevent mud and water from entering.

Images