A large-diameter drilling device and drilling method based on hydraulic combined rock breaking

Abstract

The present invention discloses a large-diameter drilling device and a drilling method based on hydraulic combined rock breaking, which relate to the technical field of cast-in-place pile construction. The drilling device comprises a combined stand, a driving assembly, a drill pipe and a controller. The driving assembly is arranged on the combined stand, the drill pipe is arranged on the driving assembly and is rotatably connected thereto, a cutter disc is arranged at the bottom of the drill pipe, and a plurality of water cutters and a plurality of rollers are arranged on the cutter disc at intervals along the circumferential direction. The controller is used to control the driving assembly to drive the drill pipe to rotate, thereby driving the plurality of water cutters and the plurality of rollers to cut rocks. The large-diameter drilling device based on hydraulic combined rock breaking of the embodiment of the present invention drives the drill pipe to rotate through the driving assembly, thereby driving the plurality of water cutters to cut rocks and the plurality of rollers to crush the cut rocks. The water cutters cooperate with the rollers to realize hydraulic combined rock breaking, which reduces the difficulty of crushing hard rocks with the rollers alone, protects the cutters, reduces the loss of equipment, improves the rock breaking efficiency, and reduces the construction cost.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place pile construction, and in particular to a large-diameter drilling device and a drilling method based on hydraulic combined rock breaking. Background Art

[0002] Bored cast-in-place piles refer to piles made by forming pile holes in the foundation soil at the construction site through mechanical drilling, steel pipe squeezing or manual excavation, and placing steel cages and pouring concrete inside. Depending on the hole-forming method, cast-in-place piles can be divided into several categories, such as sunken pipe cast-in-place piles, bored cast-in-place piles and excavated cast-in-place piles. When large-diameter bored cast-in-place piles are constructed in hard rock areas, the rock strength is too high, resulting in a slow drilling speed. Therefore, it is very necessary to increase the excavation speed during the drilling and excavation construction of large-diameter bored cast-in-place piles.

[0003] In the prior art, the bored pile drilling construction in hard rock areas is carried out by using a roller cutter to break the rock. However, using a roller cutter to break the hard rock is prone to damage to the cutter, resulting in large equipment loss, which reduces the rock breaking efficiency and increases the construction cost. Summary of the invention

[0004] The embodiment of the present invention provides a large-diameter drilling device and a drilling method based on hydraulic combined rock breaking, so as to solve the technical problem in the related art that the existing technology of using a roller cutter to break hard rock is prone to tool damage, large equipment loss, reduced rock breaking efficiency, and increased construction costs.

[0005] In a first aspect, a large-diameter drilling device based on hydraulic combined rock breaking is provided, comprising:

[0006] Combined stand;

[0007] A driving assembly, wherein the driving assembly is arranged on the combined stand;

[0008] A drill pipe, the drill pipe is arranged on the drive assembly and is rotatably connected thereto, a cutter disc is arranged at the bottom end of the drill pipe, and a plurality of water cutters and a plurality of roller cutters are arranged on the cutter disc at intervals along the circumferential direction;

[0009] A controller is disposed on the combined stand and is electrically connected to the drive assembly, and the controller is used to control the drive assembly to drive the drill pipe to rotate, thereby driving the plurality of water cutters and the plurality of roller cutters to cut rocks.

[0010] In some embodiments, the drive assembly includes:

[0011] A power head, which is arranged on the top of the combined stand;

[0012] A shock absorber, wherein the shock absorber is connected to the power head;

[0013] A drill rod, one end of which is connected to the shock absorber, and the other end of which is connected to the drill pipe.

[0014] In some embodiments, the large-diameter drilling device based on hydraulic combined rock breaking further includes:

[0015] A water pressure control assembly is arranged on the driving assembly and located above the drill pipe.

[0016] In some embodiments, the water pressure control assembly includes:

[0017] A dynamic sealing device, the dynamic sealing device is arranged around the outer circumference of the drill pipe and is rotatably connected thereto, and a water pipe is penetrated through the dynamic sealing device;

[0018] a first water pump, the first water pump being disposed at one side of the top end of the drill pipe, the first water pump being connected to the water pipe;

[0019] A motor is disposed on the other side of the top of the drill pipe, and the motor is electrically connected to the first water pump and to the controller.

[0020] In some embodiments, the water pressure control assembly further comprises:

[0021] An electric slip ring is arranged below the dynamic sealing device, and the electric slip ring is arranged around the outer circumference of the drill pipe and is rotatably connected thereto, and the electric slip ring is electrically connected to the motor and the controller.

[0022] In some embodiments, each of the water cutters is provided with positioning wheels on both sides, and the top of the positioning wheels is connected to the cutter disc via a first spring. Each of the water cutters is also provided with a telescopic pipe at the top, one end of the telescopic pipe is connected to the cutter disc, and the other end is connected to the water cutter.

[0023] In some embodiments, the cutter head further comprises:

[0024] A plurality of scrapers are provided, one of the scrapers is correspondingly arranged in front of one of the water knives, and the top end of each scraper is connected to the knife disc via a second spring.

[0025] In some embodiments, the large-diameter drilling device based on hydraulic combined rock breaking further includes:

[0026] Water tank;

[0027] A second water pump is provided between the water tank and the combined stand, one end of the second water pump is connected to the water tank through a pipeline, and the other end of the second water pump is connected to the combined stand through a pipeline.

[0028] In a second aspect, a large-diameter drilling method based on hydraulic combined rock breaking is provided, using the aforementioned large-diameter drilling device based on hydraulic combined rock breaking, comprising the following steps:

[0029] A combined stand is set up at the drilling position of the cast-in-place pile;

[0030] A driving assembly and a controller are arranged on the combined stand, a drill pipe is arranged on the driving assembly, a cutter disc is arranged on the drill pipe, and a plurality of water cutters and a plurality of roller cutters are arranged on the cutter disc at intervals along the circumferential direction;

[0031] The controller controls the driving assembly to drive the drill pipe to rotate, thereby driving multiple water cutters and multiple roller cutters to cut the rock until the drill pipe reaches a preset depth.

[0032] In some embodiments, the step of controlling the driving assembly through a controller to drive the drill pipe to rotate, thereby driving multiple water cutters and multiple roller cutters to cut the rock, includes:

[0033] Get the actual drilling depth of the drill pipe;

[0034] The motion parameters of the drill pipe and the cutting parameters of the cutter disc are adjusted according to the actual drilling depth of the drill pipe; wherein the motion parameters of the drill pipe are the rotation speed of the drill pipe, and the cutting parameters of the cutter disc are the water pressure of the water jet, the distance between the water jet and the rock, and the distance between the roller and the rock.

[0035] The beneficial effects brought about by the technical solution provided by the present invention include:

[0036] The embodiment of the present invention provides a large-diameter drilling device and a drilling method based on hydraulic combined rock breaking, wherein the drilling device comprises a combined stand, a driving assembly, a drill pipe and a controller, wherein the driving assembly is arranged on the combined stand, the drill pipe is arranged on the driving assembly and is rotatably connected thereto, a cutter disc is arranged at the bottom of the drill pipe, and a plurality of water cutters and a plurality of roller cutters are arranged on the cutter disc at intervals along the circumferential direction, the controller is arranged on the combined stand and is electrically connected to the driving assembly, and the controller is used to control the driving assembly to drive the drill pipe to rotate, thereby driving the plurality of water cutters and the plurality of roller cutters to cut rocks. The large-diameter drilling device based on hydraulic combined rock breaking of the embodiment of the present invention drives the drill pipe to rotate through the driving assembly, thereby driving the plurality of water cutters to cut rocks and the plurality of roller cutters to crush the cut rocks, wherein the plurality of water cutters cooperate with the plurality of roller cutters to realize hydraulic combined rock breaking, thereby reducing the difficulty of crushing hard rocks with roller cutters alone, protecting the cutters, reducing the loss of equipment, improving the rock breaking efficiency, and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic structural diagram of a large-diameter drilling device based on hydraulic combined rock breaking provided in an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the structure of a water pressure control assembly provided by an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the structure of a cutter disc provided in an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the structure of a water jet cutter and a roller cutter provided in an embodiment of the present invention;

[0042] Reference numerals:

[0043] 1. Combined stand;

[0044] 2. Driving assembly; 21. Power head; 22. Shock absorber; 23. Drill rod;

[0045] 3. Drill pipe;

[0046] 4. Cutter disc; 41. Water knife; 411. Positioning wheel; 4111. First spring; 412. Telescopic pipe; 42. Hob; 43. Scraper; 431. Second spring;

[0047] 5. Controller;

[0048] 6. Water pressure control assembly; 61. Dynamic sealing device; 611. Water pipe; 62. First water pump; 63. Motor; 64. Electric slip ring;

[0049] 7. Water tank;

[0050] 8. Second water pump. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The embodiment of the present invention provides a large-diameter drilling device and a drilling method based on hydraulic combined rock breaking, which can solve the technical problems in the prior art of related technologies that the use of roller cutters to break hard rocks easily leads to tool damage, large equipment loss, reduced rock breaking efficiency, and increased construction costs.

[0053] Figure 1 A large-diameter drilling device based on hydraulic combined rock breaking is provided in an embodiment of the present invention, which includes a combined stand 1, a driving assembly 2, a drill pipe 3 and a controller 5. The driving assembly 2 is arranged on the combined stand 1, the drill pipe 3 is arranged on the driving assembly 2 and is rotatably connected thereto, a cutter disc 4 is provided at the bottom end of the drill pipe 3, and a plurality of water knives 41 and a plurality of roller cutters 42 are arranged on the cutter disc 4 at intervals along the circumferential direction. The controller 5 is arranged on the combined stand 1 and is electrically connected to the driving assembly 2. The controller 5 is used to control the driving assembly 2 to drive the drill pipe 3 to rotate, thereby driving the plurality of water knives 41 and the plurality of roller cutters 42 to cut rocks.

[0054] A large-diameter drilling device based on hydraulic combined rock breaking is provided in an embodiment of the present invention, and is provided with a combined stand, a driving assembly, a drill pipe and a controller. The driving assembly is arranged on the combined stand, the drill pipe is arranged on the driving assembly and is rotatably connected thereto, a cutter disc is arranged at the bottom end of the drill pipe, a plurality of water knives and a plurality of roller cutters are arranged on the cutter disc at intervals in a circumferential direction, the cutter disc is a circular ring structure, a plurality of the water knives and a plurality of the roller cutters are evenly arranged on the cutter disc with an inner diameter to an outer diameter staggered, the controller is arranged on the combined stand and is electrically connected to the driving assembly, the drill pipe is driven to rotate by the driving assembly, and the drill pipe further drives the plurality of the water knives and the plurality of the roller cutters to rotate, the plurality of the water knives pre-destroy the rock to form free surfaces on both sides of the rock, and the plurality of the roller cutters subsequently crush the cut rock, and hydraulic combined rock breaking is achieved by the cooperation of the plurality of the water knives and the plurality of the roller cutters, thereby reducing the difficulty of crushing hard rock using the roller cutter alone, protecting the tool, reducing the loss of equipment, improving the rock breaking efficiency, and reducing the construction cost.

[0055] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, the driving assembly 2 includes: a power head 21, a shock absorber 22 and a drill rod 23. The power head 21 is arranged at the top of the combined stand 1, the shock absorber 22 is connected to the power head 21, one end of the drill rod 23 is connected to the shock absorber 22, and the other end is connected to the drill pipe 3. The power head 21 is a hydraulic rotary power head or a pneumatic rotary power head. The controller 5 controls the movement of the power head 21. The power head 21 provides power for the drill rod 23, that is, the power head 21 drives the drill rod 23 to rotate, and further drives the drill pipe 3 to rotate. The shock absorber 22 is arranged between the power head 21 and the drill rod 23, which can reduce the impact of rock breaking vibration on the drill rod 23.

[0056] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2 As shown, the large-diameter drilling device based on hydraulic combined rock breaking also includes: a water pressure control component 6, which is arranged on the driving component 2 and located above the drill pipe 3. The water pressure control component 6 provides hydraulic power for the multiple water knives 41, and adjusts the injection water pressure of the multiple water knives 41 through the water pressure control component 6.

[0057] As an optional implementation, in an embodiment of the invention, see Figure 2 As shown, the water pressure control assembly 6 includes: a dynamic sealing device 61, a first water pump 62 and a motor 63. The dynamic sealing device 61 is arranged around the outer periphery of the drill pipe 23 and is rotatably connected thereto. A water pipe 611 is penetrated through the dynamic sealing device 61. The first water pump 62 is arranged on one side of the top of the drill pipe 3. The first water pump 62 is connected to the water pipe 611. The motor 63 is arranged on the other side of the top of the drill pipe 3. The motor 63 is electrically connected to the first water pump 62 and to the controller 5. The controller 5 controls the action of the motor 63, and the motor 63 drives the first water pump 62 to move. The pump 62 delivers water to the multiple water knives 41. The controller 5 can also adjust the rotation speed of the motor 63 and the water pressure delivered by the first water pump 62. The dynamic sealing device 61 is arranged around the outer periphery of the drill rod 23. The inner ring of the dynamic sealing device 61 is rotatably connected to the drill rod 23 and rotates with the drill rod 23. The outer ring of the dynamic sealing device 61 is fixed and used to fix the water pipe 611, so that the rotation of the drill rod 23 does not affect the water delivery of the water pipe 611 to the first water pump 62. The dynamic sealing device 61 can maintain the sealing of the water pipe 611 to prevent water leakage.

[0058] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2As shown, the water pressure control assembly 6 also includes: an electric slip ring 64, which is arranged below the dynamic sealing device 61, and the electric slip ring 64 is arranged around the outer periphery of the drill rod 23 and is rotatably connected thereto, the electric slip ring 64 is electrically connected to the motor 63 and the controller 5, one end of the electric slip ring 64 is electrically connected to the controller 5, and the other end is connected to the motor 63, and is used to connect the controller 5 to the motor 63, and at the same time, the electric slip ring 64 is arranged around the outer periphery of the drill rod 23, then the inner ring of the electric slip ring 64 is rotatably connected to the drill rod 23 and rotates with the drill rod 23, and the outer ring of the electric slip ring 64 is fixed and used to fix the connecting wire between the controller 5 and the motor 63, so as to prevent the wire from being entangled with the drill rod 23 when the drill rod 23 rotates.

[0059] As an optional implementation, in an embodiment of the invention, see Figure 3 and Figure 4 As shown, positioning wheels 411 are correspondingly provided on both sides of each water knife 41, and the top of the positioning wheel 411 is connected to the cutter disc 4 through a first spring 4111. A telescopic pipe 412 is also provided at the top of each water knife 41, one end of the telescopic pipe 412 is connected to the cutter disc 4, and the other end is connected to the water knife 41. The positioning wheel 411 is movably connected to the cutter disc 4 through the first spring 4111, so that the positioning wheel 411 can be telescopic in the vertical direction. The positioning wheel 411 is used to adjust the water knife 41 so that it can cut rocks on uneven roads. The telescopic pipe 412 at the top of each water knife 41 is used to adjust the telescopic length of the water knife 41, and further adjust the distance between the water knife 41 and the rock. When the water knife 41 is close to the rock, the water knife 41 can shorten its length through the telescopic pipe 412. When the water knife 41 is far away from the rock, the water knife 41 can extend its length through the telescopic pipe 412 to avoid collision between the water knife 41 and the rock.

[0060] As an optional implementation, in an embodiment of the invention, see Figure 3 and Figure 4 As shown, the cutter disc 4 also includes: a plurality of scrapers 43, one of the scrapers 43 is correspondingly arranged in front of one of the water jets 41, and the top of each scraper 43 is connected to the cutter disc 4 through a second spring 431, and the second spring 431 enables the scraper 43 to be flexibly adjusted left and right, and the scraper 43 is used to remove the crushed rocks to avoid repeated cutting of the crushed rocks by the water jet 41.

[0061] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, the large-diameter drilling device based on hydraulic combined rock breaking also includes: a water tank 7 and a second water pump 8, the second water pump 8 is arranged between the water tank 7 and the combined stand 1, one end of the second water pump 8 is connected to the water tank 7 through a pipeline, and the other end is connected to the combined stand 1 through a pipeline, the water tank 7 is used to store water, the water tank 7 is connected to the second water pump 8 and the combined stand 1 through a water guide pipe, the second water pump 8 transports the water in the water tank 7 to the water pressure control component 6 in the combined stand 1, the water in the water tank 7 enters the first water pump 62 through the water pipe 611, and the first water pump 62 further transports the water to the multiple water knives 41 for cutting rocks.

[0062] The working principle of the large-diameter drilling device based on hydraulic combined rock breaking in the embodiment of the present invention is as follows:

[0063] Draw a drawing of the distribution position of the bored piles and determine the drilling position of the bored piles, set a combined stand 1 at the drilling position of the bored piles, set the driving assembly 2 at the top of the combined stand 1, set the drill pipe 3 on the driving assembly 2, and set a plurality of water cutters 41 and a plurality of roller cutters 42 on the drill pipe 3 along the circumferential direction. The combined stand 1 is also provided with the controller 5, and the controller 5 controls the driving assembly 2 to drive the drill pipe 3 to rotate, thereby driving the plurality of water cutters 41 and the plurality of roller cutters 42 to rotate, and the drill pipe 3 rotates according to the rotation speed set by the controller 5. The multiple water jets 41 cut rocks according to the water pressure parameters and the distance parameters from the rocks set by the controller 5, pre-destroy the rocks to form free surfaces on both sides of the rocks, the multiple roller cutters 42 crush the cut rocks according to the distance parameters from the rocks set by the controller 5, the multiple scrapers 43 remove the crushed rocks, the multiple water jets 41 cut the next layer of rocks, repeat the actions of cutting, crushing and removing rocks, and then carry out the next stage of drilling of the bored piles until the drill pipe 3 is drilled to a preset depth, then the borehole is cleaned and the hole is inspected, and the drilling construction of the bored piles is completed.

[0064] The embodiment of the present invention further provides a large-diameter drilling method based on hydraulic combined rock breaking, using the aforementioned large-diameter drilling device based on hydraulic combined rock breaking, comprising the following steps:

[0065] A combined stand 1 is arranged at the drilling position of the cast-in-place pile;

[0066] A driving assembly 2 and a controller 5 are arranged on the combined stand 1, a drill pipe 3 is arranged on the driving assembly 2, a cutter head 4 is arranged on the drill pipe 3, and a plurality of water cutters 41 and a plurality of roller cutters 42 are arranged on the cutter head 4 at intervals along the circumferential direction;

[0067] The controller 5 controls the driving assembly 2 to drive the drill pipe 3 to rotate, thereby driving the multiple water cutters 41 and the multiple roller cutters 42 to cut the rock until the drill pipe 3 drills to a preset depth.

[0068] The large-diameter drilling method based on hydraulic combined rock breaking in the embodiment of the present invention drives the drill pipe to rotate through the driving assembly, and the drill pipe further drives the multiple water cutters and the multiple rollers to rotate. The multiple water cutters pre-destroy the rock to form free surfaces on both sides of the rock, and the multiple rollers then crush the cut rock. The hydraulic combined rock breaking is achieved by the cooperation of the multiple water cutters and the multiple rollers, which reduces the difficulty of crushing hard rock with the roller alone, protects the tool, reduces equipment loss, improves rock breaking efficiency, and reduces construction costs.

[0069] As an optional implementation, in one embodiment of the invention, the step of controlling the driving assembly through the controller to drive the drill pipe to rotate, thereby driving multiple water cutters and multiple roller cutters to cut the rock, includes:

[0070] Obtaining the actual drilling depth of the drill pipe 3;

[0071] The motion parameters of the drill pipe 3 and the cutting parameters of the cutter head 4 are adjusted according to the actual drilling depth of the drill pipe 3; wherein the motion parameter of the drill pipe 3 is the drill pipe rotation speed, and the cutting parameters of the cutter head 4 are the water pressure of the water jet, the distance between the water jet and the rock, and the distance between the roller and the rock.

[0072] Specifically, when the actual drilling depth of the drill pipe 3 increases, the rotation speed of the drill pipe 3 is reduced, that is, the drilling speed of the drill pipe 3 is reduced, the water pressure of the water jet 41 is increased, and the distance between the water jet 41 and the rock and the distance between the roller cutter 42 and the rock are reduced.

[0073] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0074] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0075] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A large-diameter drilling device based on hydraulic combined rock breaking, characterized in that: include: Combined stand (1); A driving assembly (2), wherein the driving assembly (2) is arranged on the combined stand (1); A drill pipe (3), the drill pipe (3) being arranged on the drive assembly (2) and being rotatably connected thereto, a cutter disc (4) being arranged at the bottom end of the drill pipe (3), and a plurality of water knives (41) and a plurality of roller cutters (42) being arranged on the cutter disc (4) at intervals along a circumferential direction; a controller (5), the controller (5) being arranged on the combined stand (1) and being electrically connected to the driving assembly (2), the controller (5) being used to control the driving assembly (2) to drive the drill pipe (3) to rotate, thereby driving the plurality of water cutters (41) and the plurality of roller cutters (42) to cut rocks; Positioning wheels (411) are correspondingly provided on both sides of each water knife (41), the top end of the positioning wheel (411) is connected to the knife disc (4) via a first spring (4111), and a telescopic pipe (412) is also provided at the top end of each water knife (41), one end of the telescopic pipe (412) is connected to the knife disc (4), and the other end is connected to the water knife (41); The telescopic pipe is used to adjust the distance between the water knife (41) and the rock to avoid collision between the water knife (41) and the rock; and is also used to reduce the distance between the water knife (41) and the rock when the actual drilling depth of the drill pipe (3) increases; The knife disc (4) also includes: a plurality of scrapers (43), wherein one scraper (43) is correspondingly arranged in front of one of the water knives (41), and the top end of each scraper (43) is connected to the knife disc (4) via a second spring (431); The driving component (2) comprises: A power head (21), the power head (21) being arranged at the top end of the combined stand (1); A shock absorber (22), the shock absorber (22) being connected to the power head (21); A drill rod (23), one end of the drill rod (23) being connected to the shock absorber (22), and the other end of the drill rod (23) being connected to the drill pipe (3); Also includes: A water pressure control component (6), the water pressure control component (6) being arranged on the driving component (2) and located above the drill pipe (3); The water pressure control component (6) comprises: A dynamic sealing device (61), the dynamic sealing device (61) being arranged around the outer circumference of the drill rod (23) and being rotatably connected thereto, and a water pipe (611) penetrating the dynamic sealing device (61); a first water pump (62), the first water pump (62) being arranged on one side of the top end of the drill pipe (3), the first water pump (62) being connected to the water pipe (611); A motor (63), the motor (63) being arranged on the other side of the top end of the drill pipe (3), the motor (63) being electrically connected to the first water pump (62) and to the controller (5).

2. The large-diameter drilling device based on hydraulic combined rock breaking according to claim 1 is characterized in that: The water pressure control component (6) further comprises: An electric slip ring (64), the electric slip ring (64) being arranged below the dynamic sealing device (61), and the electric slip ring (64) being arranged around the outer circumference of the drill rod (23) and being rotatably connected thereto, and the electric slip ring (64) being electrically connected to the motor (63) and the controller (5).

3. The large-diameter drilling device based on hydraulic combined rock breaking according to claim 1 is characterized in that: Also includes: Water tank (7); A second water pump (8), the second water pump (8) being arranged between the water tank (7) and the combined stand (1), one end of the second water pump (8) being connected to the water tank (7) via a pipeline, and the other end of the second water pump (8) being connected to the combined stand (1) via a pipeline.

4. A large-diameter drilling method based on hydraulic combined rock breaking, using the large-diameter drilling device based on hydraulic combined rock breaking according to claim 1, characterized in that: The following steps are involved: A combined stand (1) is provided at the drilling position of the cast-in-place pile; A drive assembly (2) and a controller (5) are arranged on the combined stand (1), a drill pipe (3) is arranged on the drive assembly (2), a cutter head (4) is arranged on the drill pipe (3), and a plurality of water knives (41) and a plurality of roller cutters (42) are arranged on the cutter head (4) at intervals along a circumferential direction; The controller (5) controls the driving assembly (2) to drive the drill pipe (3) to rotate, thereby driving the plurality of water cutters (41) and the plurality of roller cutters (42) to cut the rock until the drill pipe (3) drills to a preset depth.

5. The large-diameter drilling method based on hydraulic combined rock breaking according to claim 4 is characterized in that: The step of controlling the driving assembly through the controller to drive the drill pipe to rotate, thereby driving multiple water cutters and multiple roller cutters to cut rocks includes: Obtaining the actual drilling depth of the drill pipe (3); The motion parameters of the drill pipe (3) and the cutting parameters of the cutter head (4) are adjusted according to the actual drilling depth of the drill pipe (3); wherein the motion parameters of the drill pipe (3) are the rotation speed of the drill pipe, and the cutting parameters of the cutter head (4) are the water pressure of the water jet, the distance between the water jet and the rock, and the distance between the roller cutter and the rock.

Images