Drilling rig apparatus and method of construction based on high pressure water jet technology

Abstract

A drilling rig equipment and construction method based on high-pressure water jet technology, including drill pipe system, frame system, high-pressure water system and control system, drill pipe system includes drill bit, drill pipe, drill pipe mounting seat and drill pipe propulsion device, the fixed end of drill pipe propulsion device is fixedly connected with frame system, drill pipe mounting seat is installed on the movable end of drill pipe propulsion device, one end of drill pipe is rotatably connected with drill pipe mounting seat, the other end of drill pipe is provided with drill bit, the front end working surface of drill bit is provided with slag discharge hole and spray hole, a plurality of slag discharge holes penetrate through drill bit, a plurality of spray holes are communicated with drill pipe, pressure sensor is installed in drill bit. The rock-soil is cut into hole by drill bit through high-pressure water, the slag discharge hole is arranged on drill bit for discharging water and rock slag, the pressure sensor is installed on drill bit, the drilling speed of hole can be adjusted in real time according to rock formation, the drill bit is prevented from being damaged when drilling, the present application has the characteristics of fast construction speed and small drill bit wear.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering drilling construction, and particularly relates to a drilling rig device based on high-pressure water jet technology and a construction method. BACKGROUND

[0002] The conventional drilling rig device is an impact drill and a rotary drill. The impact drill is used to extrude rock and soil to form a hole by reciprocating vertical movement of a drill bit with strong impact force, and can be applied to a wide range of geology, but the drilling speed is slow, and a large amount of mechanical energy is consumed in the reciprocating movement of the drill bit, resulting in large energy consumption. The rotary drill relies on the rotary movement of the drill bit to cut rock and soil to form a hole, and the hole forming speed is fast, but the drill bit is greatly worn in hard rock. Therefore, the present inventors have improved the current drilling device.

[0003] Chinese patent document CN112796659A, published on May 14, 2021, discloses a static comb-shaped drilling device and method, which comprises a drilling rig with a drill rod, the distal end of the drill rod is fixedly connected with a drill for breaking rock and coal layers, the drill is provided with a nozzle, the drilling rig is connected with a high-pressure water pump through a high-pressure pipe, high-pressure water is input to the drilling rig through the high-pressure water pump and the high-pressure pipe, the high-pressure water is delivered to the drill through the drill rod, and a high-pressure water jet is formed through the nozzle to construct a branch hole. The drilling device mainly relies on the drill at the front end of the drill rod to drill, the nozzle is arranged on the side of the drill to construct a branch hole, and the drill rod of the device cannot adjust the drilling speed in real time according to the rock layer. SUMMARY

[0004] The technical problem to be solved by the present application is to solve the problems in the above background technology, provide a drilling rig device based on high-pressure water jet technology, cut rock and soil into a hole by high-pressure water, and adjust the drilling speed in real time according to the rock layer to prevent damage to the drill bit during drilling, with the characteristics of fast construction speed and small drill bit wear.

[0005] Another technical problem to be solved by the present application is to provide a construction method using the drilling rig device based on high-pressure water jet technology, adjust the drill bit advancing speed according to the drill bit pressure, achieve the best advancing speed adaptive to different geology, and adapt to drilling of different geological rock layers.

[0006] In order to realize the above technical features, the purpose of the present application is realized as follows: a drilling rig device based on high-pressure water jet technology, comprising a drill rod system, a vehicle frame system, a high-pressure water system and a control system, the drill rod system comprising a drill bit, a drill rod, a drill rod mounting seat and a drill rod propulsion device, the fixed end of the drill rod propulsion device being fixedly connected with the vehicle frame system, the drill rod mounting seat being mounted on the movable end of the drill rod propulsion device, one end of the drill rod being rotatably connected with the drill rod mounting seat and being driven to rotate by a driving device mounted on the drill rod mounting seat, the drill rod being a hollow tubular structure, the other end of the drill rod being provided with the drill bit, the high-pressure water system being connected with the drill rod through a high-pressure hose, a plurality of slag discharge holes being formed through the drill bit, a plurality of spray holes being in communication with the drill rod, the radii of the spray holes from the central axis of the drill bit being different, a pressure sensor being further mounted in the drill bit and extending out of the front working surface of the drill bit, the control system being electrically connected with the pressure sensor, the driving device, the drill rod propulsion device and the high-pressure water system.

[0007] The drill rod is rotatably connected with the drill rod mounting seat through a sliding bearing, a high-pressure water rotary joint is mounted on the end of the drill rod located at one end of the drill rod mounting seat, and the high-pressure hose is connected with the high-pressure water rotary joint.

[0008] The driving device is an electric motor or a hydraulic motor, the electric motor or the hydraulic motor is mounted in the drill rod mounting seat, and a belt pulley is mounted on the output shaft of the electric motor or the hydraulic motor and on the drill rod respectively, and a transmission belt is mounted on the belt pulleys on both sides.

[0009] The vehicle frame system comprises a vehicle chassis, an operating room and a power system, the operating room is mounted on the vehicle chassis, an arm support for mounting and supporting the drill rod propulsion device is mounted on the vehicle chassis, the arm support comprises a first supporting arm and a second supporting arm, one end of the first supporting arm is hingedly connected with the vehicle chassis, the other end is hingedly connected with the second supporting arm, the drill rod propulsion device is mounted on the second supporting arm, an arm support hydraulic cylinder is hingedly mounted on the first supporting arm, the piston rod end of the arm support hydraulic cylinder is hingedly connected with the second supporting arm, the first supporting arm is driven to swing by the hydraulic cylinder mounted on the vehicle chassis, and the power system provides power for the vehicle chassis and the drill rod system.

[0010] The high-pressure water system comprises a high-pressure pump and a water storage tank, the high-pressure pump and the water storage tank are mounted on the vehicle frame system, the water outlet of the high-pressure pump is connected with the drill rod through a high-pressure hose, and the high-pressure pump pumps high-pressure water or compressed air by pumping water from the water storage tank.

[0011] The drill bit comprises a connecting end and a working end, the connecting end is in a circular truncated cone structure, the small end of the connecting end is fixedly connected or threadedly connected with the drill rod, the large end is connected with the working end, the slag discharge holes penetrate through the working end and the connecting end, and the spray holes are arranged on the working end and are in communication with the water guide cavity in the connecting end.

[0012] The several said injection holes are arranged in two rows in transverse and longitudinal directions, and the slag discharge hole is arranged in the area divided by the two rows of said injection holes.

[0013] A construction method of a drilling rig device using the high-pressure water jet technology, comprising the following steps:

[0014] S1. Fixing the drilling point: controlling the frame system to aim the drilling rod system at the drilling point, and locking the frame system;

[0015] S2. Pre-setting the drilling speed: according to different geological types, pre-setting the drilling speed on the control system; wherein, for weak weathered stratum, the pre-set drilling speed is 2-5mm / s; for medium weathered stratum, the pre-set drilling speed is 8-12mm / s; for strong weathered stratum, the pre-set drilling speed is 15-20mm / s;

[0016] S3. Adaptive drilling: under the control of the control system, the driving device and the high-pressure water system are started, the drilling rod starts to rotate and drives the drill bit to rotate, and the drilling rod advancing device advances forward at the pre-set drilling speed; when the drill bit enters the soft rock soil to drill, the rock surface is quickly cut, the pressure sensor has no contact with the rock surface, at this time, the control system will control the drilling rod advancing device to increase the advancing speed on the basis of the pre-set drilling speed, the pressure sensor gradually approaches the rock surface, and finally contacts the rock surface, the pressure of the pressure sensor gradually increases, when the pressure value of the pressure sensor reaches the optimal contact pressure F N , the control system will control the drilling rod advancing device to advance forward at the current advancing speed; when the drill bit enters the hard rock soil to drill, the rock surface is cut at a slow speed, and when still drilling at the current speed, the pressure sensor is extruded by the contact of the rock surface, the contact pressure F gradually increases, the control system will control the drilling rod advancing device to reduce the advancing speed, the pressure value F of the pressure sensor decreases, until F=F N , the control system will control the drilling rod advancing device to advance forward at the current advancing speed;

[0017] S4. Hole forming and hole cleaning: when the drilling rod advancing device is retracted to the predetermined length, the drilling is completed; the control system controls the driving device to stop working, the drilling rod stops rotating, the high-pressure water system stops pumping high-pressure water, the valve of the high-pressure pump of the high-pressure water system is switched to pump compressed air, and the airflow is blown out from the drill bit, the accumulated water and rock slag in the drilling hole are blown out, and the hole cleaning is completed;

[0018] S5. The control system controls the drilling rod advancing device to retract, and the drilling rod is retracted to perform the cycle of the next hole.

[0019] The present application has the following beneficial effects:

[0020] 1. The frame system is used for supporting and moving the drill rod system, the drill rod system is used for drilling operation, high pressure water is pumped through the high pressure water system, the drill bit cuts the rock and soil into a hole through the high pressure water, the drill bit is provided with a residue discharge hole for discharging water and rock residue, the drill bit is provided with a pressure sensor, the drilling speed can be adjusted in real time according to the rock formation, the high pressure water jet cuts the rock into small particles, and the particles are discharged from the drill hole with the water flow, compared with the traditional percussion drill and the rotary drill, the drilling speed is fast, the drill bit is less worn and the like.

[0021] 2. The control system is used for controlling the drill rod pushing device, the driving device, the high pressure water system and the like, so that the equipment start-stop, drilling and cutting, compressed air hole cleaning and the like can be integrally controlled, and the automation degree is high.

[0022] 3. The front working surface of the drill bit is provided with a residue discharge hole and a spray hole, the plurality of residue discharge holes penetrate the drill bit, the plurality of spray holes are communicated with the drill rod, the radius of each spray hole to the central axis of the drill bit is different, the high pressure water drill bit rotates one circle, and the drilling cutting surface is fully covered and cut.

[0023] 4. The drill bit is provided with a pressure sensor, the pressure sensor extends out of the front working surface of the drill bit, the drill bit pushing speed is adjusted according to the drill bit pressure, the optimal pushing speed is adapted to different geology, the equipment is suitable for drilling in different geological strata, and the adaptability is high.

[0024] 5. The high pressure water is used for drilling, and the compressed air is used for hole cleaning, so that the hole is drilled and excavated at one time, the influence of accumulated water in the hole is avoided, and the construction is convenient and efficient.

[0025] 6. In the construction method S3, the pressure sensor and the drill rod pushing device are matched, the optimal pushing speed is adapted to different geology, and the drill bit is not easy to be damaged. DETAILED DESCRIPTION

[0026] Figure 1 It is a whole structure schematic view of the present application.

[0027] Figure 2 It is a frame system structure schematic view of the present application.

[0028] Figure 3 It is a drill rod system structure schematic view of the present application.

[0029] Figure 4 It is a drill bit front view structure schematic view of the present application.

[0030] Figure 5 It is Figure 4 It is an A-A section structure schematic view.

[0031] Figure 6 It is a control system connection schematic view of the present application.

[0032] Figure 7The schematic diagram of the working state of the drill bit of the present application.

[0033] Figure 8 The schematic diagram of the cutting point cutting of the adjacent high-pressure water of the drill bit of the present application.

[0034] In the figure: drill rod system 1, frame system 2, drill bit 3, connecting end 31, working end 32, residue discharging hole 33, jet hole 34, pressure sensor 35, drill rod 4, drill rod mounting seat 5, sliding bearing 6, high-pressure water rotary joint 7, high-pressure hose 8, transmission belt 9, driving device 10, drill rod propelling device 11, arm support 12, first branch arm 121, second branch arm 122, arm support hydraulic cylinder 13, operation room 14, power system 15, high-pressure water system 16, water storage tank 17, vehicle chassis 18, control system 19. DETAILED DESCRIPTION

[0035] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] Reference Figures 1-8 A drilling rig device based on high-pressure water jet technology, comprising a drill rod system 1, a frame system 2, a high-pressure water system 16 and a control system 19, the drill rod system 1 comprising a drill bit 3, a drill rod 4, a drill rod mounting seat 5 and a drill rod propelling device 11, the fixed end of the drill rod propelling device 11 being fixedly connected with the frame system 2, the drill rod mounting seat 5 being installed at the movable end of the drill rod propelling device 11, one end of the drill rod 4 being rotatably connected with the drill rod mounting seat 5 and being driven to rotate by the driving device 10 installed on the drill rod mounting seat 5, the drill rod 4 being a hollow tubular, the other end of the drill rod 4 being installed with the drill bit 3, the high-pressure water system 16 being connected with the drill rod 4 through the high-pressure hose 8, the front working surface of the drill bit 3 being provided with the residue discharging hole 33 and the jet hole 34, the plurality of residue discharging holes 33 penetrating through the drill bit 3, the plurality of jet holes 34 being in communication with the drill rod 4, the radii of the jet holes 34 from the central axis of the drill bit 3 being different, the pressure sensor 35 being further installed in the drill bit 3, the pressure sensor 35 extending out of the front working surface of the drill bit 3, the control system 19 being electrically connected with the pressure sensor 35, the driving device 10, the drill rod propelling device 11 and the high-pressure water system 16. The frame system 2 is used for supporting and moving the drill rod system 1, the drill rod system 1 is used for drilling operation, high-pressure water is pumped by the high-pressure water system 16, the rock-soil is cut into a hole by the drill bit 3 through the high-pressure water, the residue discharging hole 33 is provided on the drill bit 3 for discharging water and rock residue, the pressure sensor 35 is installed on the drill bit 3, the drilling speed can be adjusted in real time according to the rock formation, and the drill bit is prevented from being damaged during drilling. The present application has the characteristics of fast construction speed and small drill bit wear.

[0038] Preferably, the vehicle frame system 2 adopts the track frame structure disclosed in CN103707950 A Tunnel Crawler Walking Engineering Drilling Rig Special Track Frame. The drill rod propulsion device 11 adopts the drill arm structure disclosed in CN 209653963 U Remote Control Operation Full Hydraulic Tunneling Drill Rig. The pressure sensor 35 adopts a piezoelectric pressure sensor of YCRYL101Y type, which is installed and connected with the drill bit 3 through threads.

[0039] Referring to Figure 3 , the drill rod 4 is rotatably connected with the drill rod mounting seat 5 through a sliding bearing 6, the end of the drill rod 4 located at one end of the drill rod mounting seat 5 is provided with a high-pressure water rotary joint 7, and a high-pressure hose 8 is connected with the high-pressure water rotary joint 7. Of course, the drill rod mounting structure disclosed in CN 112796659 A can also be used.

[0040] Specifically, the driving device 10 is an electric motor or a hydraulic motor, which is installed in the drill rod mounting seat 5. A belt pulley is installed on the output shaft of the electric motor or the hydraulic motor and on the drill rod 4, respectively. A transmission belt 9 is installed on the belt pulleys on both sides. The structure is simple, and it can prevent the drill bit from being stuck and damaging the driving device 10. When stuck, the transmission belt 9 slips, thereby protecting the driving device 10.

[0041] Specifically, referring to Figure 2 , the vehicle frame system 2 includes a vehicle chassis 18, an operating room 14, and a power system 15. The operating room 14 is installed on the vehicle chassis 18. The vehicle chassis 18 is provided with an arm support 12 for mounting and supporting the drill rod propulsion device 11. The arm support 12 includes a first branch arm 121 and a second branch arm 122. One end of the first branch arm 121 is hinged to the vehicle chassis 18, and the other end is hinged to the second branch arm 122. The drill rod propulsion device 11 is installed on the second branch arm 122. An arm support hydraulic oil cylinder 13 is hingedly installed on the first branch arm 121. The piston rod end of the arm support hydraulic oil cylinder 13 is hinged to the second branch arm 122. The first branch arm 121 is driven to swing by a hydraulic oil cylinder installed on the vehicle chassis 18. The power system 15 provides power for the vehicle chassis 18 and the drill rod system 1. By controlling the actions of the first branch arm 121 and the second branch arm 122, the position of the drill rod system 1 can be adjusted.

[0042] Specifically, the high-pressure water system 16 includes a high-pressure pump and a water storage tank 17. The high-pressure pump and the water storage tank 17 are installed on the vehicle frame system 2. The water outlet of the high-pressure pump is connected with the drill rod 4 through the high-pressure hose 8. The high-pressure pump pumps high-pressure water or compressed air by pumping water from the water storage tank 17.

[0043] Referring to Figure 4, the drill bit 3 includes a connecting end 31 and a working end 32, the connecting end 31 is a circular truncated cone structure, the small end of the connecting end 31 is fixedly connected or threadedly connected with the drill rod 4, the large end is connected with the working end 32, the deslagging hole 33 penetrates through the working end 32 and the connecting end 31, the jet hole 34 is arranged on the working end 32 and communicates with the water guide cavity in the connecting end 31. The connecting end 31 of the circular truncated cone structure is convenient for arranging the deslagging hole 33, and the working end 32 is used for arranging the jet hole 34 and mounting the pressure sensor 35.

[0044] Referring to Figure 5 , the plurality of jet holes 34 are arranged in two rows in the transverse direction and the longitudinal direction, the deslagging hole 33 is provided with four, which are respectively located in the regions divided by the two rows of jet holes 34 in the transverse direction and the longitudinal direction, and the four pressure sensors 35 are respectively and uniformly arranged on the edges of the drill bit 3.

[0045] Specifically, the cross section of the jet hole 34 is divided along the transverse axis and the longitudinal axis, and each jet hole is at a different radius from the rotation axis of the drill bit 3, so that the adjacent jet holes 34 cut out grooves with partially overlapping boundaries, as shown in Figure 7 、 8 The outermost jet hole 34 has a certain jet angle, so that the diameter of the rock cutting surface is slightly larger than the diameter of the drill bit 3, so that the drill bit 3 is not pressed by the rock surface of the drill hole, as shown in Figure 7 In the process of continuously advancing the drill rod 4, the drill bit 3 gradually cuts the rock and soil to form a drill hole.

[0046] For different types of geological conditions, the drill bit 3 can be switched to change the arrangement mode of the jet holes, so as to improve the drilling efficiency. For fully weathered strata, the jet holes 34 do not need to be arranged too densely, only Δl=r1-r2≤d+0.25D (where D is the diameter of the deslagging hole 33) is required; for medium weathered strata, the number of jet holes is increased, so that Δl=r1-r2≤d, so that the high-pressure water can fully cover the cross section of the drill hole in one rotation of the drill bit 3; for weakly weathered strata, the number of jet holes is increased, and the overlapping degree of the cutting surfaces of adjacent jet holes is increased, that is, Δl=r1-r2≤0.5d, so that the high-pressure water can cut the rock surface twice in one rotation of the drill bit 3, so as to strengthen the cutting force on the hard rock strata.

[0047] Embodiment two:

[0048] A construction method of a drilling rig equipment based on high-pressure water jet technology, comprising the following steps:

[0049] S1. Fix the drilling point: control the frame system 2 to aim the drill rod system 1 at the drilling point, and lock the frame system 2.

[0050] S2. Preset drilling speed: The drilling speed is preset on the control system 19 according to different geological types; for weakly weathered strata, the preset drilling speed is 2~5 mm / s; for moderately weathered strata, the preset drilling speed is 8~12 mm / s; for strongly weathered strata, the preset drilling speed is 15~20 mm / s.

[0051] S3. Adaptive Drilling: Under the control of the control system 19, the drive unit 10 and the high-pressure water system 16 are started, the drill rod 4 begins to rotate, and drives the drill bit 3 to rotate. The drill rod propulsion device 11 drills forward at the preset drilling speed. When the drill bit 3 enters the soft rock and soil, the rock surface is cut quickly, and the pressure sensor 35 is not in contact with the rock surface. At this time, the control system 19 will control the drill rod propulsion device 11 to increase the propulsion speed based on the preset drilling speed. The pressure sensor 35 gradually approaches the rock surface and eventually contacts the rock surface. The pressure on the pressure sensor 35 gradually increases. When the pressure value of the pressure sensor 35 reaches the optimal contact pressure F... N At the specified time (FN is the optimal contact pressure calibrated experimentally to prevent damage to the drill rod system due to excessive hydraulic system propulsion speed), the control system 19 will control the drill rod propulsion device 11 to advance steadily at the current propulsion speed; when the drill bit 3 enters hard rock and soil for drilling, the rock surface is cut at a slower speed, and while drilling continues at the current speed, the pressure sensor 35 is subjected to contact and compression from the rock surface, and the contact pressure F gradually increases, i.e., F > F N The control system 19 will control the drill pipe propulsion device 11 to reduce the forward propulsion speed, and the pressure value F of the pressure sensor 35 will decrease until F = F N The control system 19 will control the drill rod propulsion device 11 to advance steadily at the current propulsion speed. That is, when the drill bit 3 passes through rock strata of different properties, the CNC system will control the propulsion speed of the drill rod propulsion device 11 according to the pressure received by the pressure sensor 34, so as to achieve adaptive drilling speed under different geological conditions.

[0052] S4. Hole Formation and Cleaning: When the drill rod advance device 11 extends to the predetermined length, drilling is completed; the control system 19 controls the drive device 10 to stop working, the drill rod 4 stops rotating, the high-pressure water system 16 stops pumping high-pressure water, and the high-pressure pump valve of the high-pressure water system 16 switches to pumping compressed air. The airflow blows out from the drill bit 3, and the accumulated water and rock debris in the borehole are blown out, completing the hole cleaning.

[0053] S5. The control system 19 controls the drill rod propulsion device 11 to retract, retracting the drill rod 4 to begin the cycle for the next hole position.

Claims

1. A construction method based on high pressure water jet technology, characterized in that: The drilling equipment based on high-pressure water jet technology is characterized in that the drilling equipment comprises a drill rod system, a frame system, a high-pressure water system and a control system, the drill rod system comprises a drill bit, a drill rod, a drill rod mounting seat and a drill rod propulsion device, the fixed end of the drill rod propulsion device is fixedly connected with the frame system, the drill rod mounting seat is mounted at the movable end of the drill rod propulsion device, one end of the drill rod is rotatably connected with the drill rod mounting seat and is driven to rotate by a driving device mounted on the drill rod mounting seat, the drill rod is a hollow pipe, the other end of the drill rod is provided with the drill bit, the high-pressure water system is connected with the drill rod through a high-pressure hose, a plurality of discharge holes and a plurality of spray holes are arranged on the front working surface of the drill bit, the plurality of discharge holes penetrate through the drill bit, the plurality of spray holes are communicated with the drill rod, the distances from the plurality of spray holes to the central axis of the drill bit are different, a pressure sensor is further mounted in the drill bit and extends out of the front working surface of the drill bit, and the control system is electrically connected with the pressure sensor, the driving device, the drill rod propulsion device and the high-pressure water system. The drill bit comprises a connecting end and a working end, the connecting end is in a circular truncated cone structure, the small end of the connecting end is fixedly connected or threadedly connected with the drill rod, the large end is connected with the working end, the discharge holes penetrate through the working end and the connecting end, and the spray holes are arranged on the working end and communicated with a water guide cavity in the connecting end. The plurality of spray holes are arranged in two rows in the horizontal and vertical directions, the discharge holes are arranged at four positions in the areas divided by the two rows of spray holes in the horizontal and vertical directions. The construction method comprises the following steps: S1. Fixing a drilling point: controlling the frame system to aim the drill rod system at the drilling point and locking the frame system; S2. Pre-setting a drilling speed: pre-setting the drilling speed on the control system according to different geological types; for weakly weathered strata, the pre-set drilling speed is 2-5 mm / s; for moderately weathered strata, the pre-set drilling speed is 8-12 mm / s; for strongly weathered strata, the pre-set drilling speed is 15-20 mm / s; for fully weathered strata, Δl=r1-r2≤d+0.25D, for moderately weathered strata, Δl=r1-r2≤d, so that the high-pressure water fully covers the drilling section during one rotation of the drill bit; for weakly weathered strata, Δl=r1-r2≤0.5d, so that the high-pressure water cuts the rock surface twice during one rotation of the drill bit; wherein r1 and r2 are the radii of the centers of adjacent spray holes from the central axis of the drill bit, d is the diameter of the spray hole section, D is the diameter of the discharge hole, and Δl is the difference between r1 and r2; S3. Adaptive drilling: under the control of the control system, the driving device and the high-pressure water system start, the drill rod starts to rotate and drives the drill bit to rotate, and the drill rod propulsion device advances forward at the preset drilling speed; when the drill bit enters the soft rock soil and drills, the rock surface is quickly cut, the pressure sensor has no contact with the rock surface, at this time the control system will control the drill rod propulsion device to increase the propulsion speed on the basis of the preset drilling speed, the pressure sensor gradually approaches the rock surface, and finally contacts the rock surface, the pressure of the pressure sensor gradually increases, when the pressure value of the pressure sensor reaches the best contact pressure F N , the control system will control the drill rod propulsion device to advance forward at the current propulsion speed; when the drill bit enters the hard rock soil and drills, the rock surface is cut at a slow speed, and when it is still drilled at the current speed, the pressure sensor is pressed by the rock surface contact, the contact pressure F gradually increases, the control system will control the drill rod propulsion device to reduce the forward propulsion speed, the pressure value F of the pressure sensor decreases, until F=F N , the control system will control the drill rod propulsion device to advance forward at the current propulsion speed; S4. Hole forming and hole cleaning: when the drill rod propulsion device is retracted to the predetermined length, the drilling is completed; the control system controls the driving device to stop working, the drill rod stops rotating, the high-pressure water system stops pumping high-pressure water, the valve of the high-pressure pump of the high-pressure water system is switched to pump compressed air, the airflow is blown out from the drill bit, the accumulated water and rock debris in the drilling hole are blown out, and the hole cleaning is completed; S5. The control system controls the drill rod propulsion device to retract, the drill rod is retracted, and the cycle of the next hole is performed.

2. The construction method based on high-pressure water jet technology according to claim 1, characterized in that: The drill rod is rotatably connected with the drill rod mounting seat through a sliding bearing, the end of the drill rod at one end of the drill rod mounting seat is provided with a high-pressure water rotary joint, and the high-pressure hose is connected with the high-pressure water rotary joint.

3. The construction method based on high-pressure water jet technology according to claim 1, characterized in that: The driving device is an electric motor or a hydraulic motor, which is installed in the drill rod mounting seat, and a belt pulley is installed on the output shaft of the electric motor or the hydraulic motor and on the drill rod, and a transmission belt is installed on the two belt pulleys.

4. The construction method based on high-pressure water jet technology according to claim 1, characterized in that: The vehicle frame system comprises a vehicle chassis, an operating room and a power system, the operating room is installed on the vehicle chassis, and an arm support for installing and supporting the drill rod propulsion device is installed on the vehicle chassis, the arm support comprises a first supporting arm and a second supporting arm, one end of the first supporting arm is hinged to the vehicle chassis, the other end is hinged to the second supporting arm, the drill rod propulsion device is installed on the second supporting arm, an arm support hydraulic cylinder is hingedly installed on the first supporting arm, the piston rod end of the arm support hydraulic cylinder is hinged to the second supporting arm, the first supporting arm is driven to swing by the hydraulic cylinder installed on the vehicle chassis, and the power system provides power for the vehicle chassis and the drill rod system.

5. The construction method based on high-pressure water jet technology according to claim 1, characterized in that: The high-pressure water system comprises a high-pressure pump machine and a water storage tank, the high-pressure pump machine and the water storage tank are installed on the vehicle frame system, the water outlet of the high-pressure pump machine is connected with the drill rod through a high-pressure hose, and the high-pressure pump machine pumps high-pressure water by pumping water from the water storage tank and pressurizing, or pumps compressed air.

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