LU502510B1 - Dry Drilling Rig for Construction in Underground Narrow Space and Construction Method Thereof - Google Patents

Abstract

Disclosed are a dry drilling rig for construction in underground narrow space and a construction method thereof. The dry drilling rig for construction in underground narrow space comprises a travelling system and a hole-forming system, the hole-forming system is arranged at one end of the travelling system and is provided with a travelling state and a working state; the traveling system includes traveling chassis, hydraulic station, winch and landing gear; the hole- forming system includes a main frame, a power head, a casing driver, a casing, a drill rod and a drill bit. The main frame is movably connected to the traveling chassis; the power head is arranged in the main frame and connected with the winch through a connecting rope; the power head and landing gear are connected with the hydraulic station; the casing driver is arranged at the lower part of the power head.

Description

DESCRIPTION LU502510 Dry Drilling Rig for Construction in Underground Narrow Space and Construction Method Thereof

TECHNICAL FIELD The invention relates to the technical field of building construction, and in particular to a dry drilling rig and a construction method for construction in a narrow underground space.

BACKGROUND Pile driver is a special equipment in pile foundation construction, which plays an important role in engineering construction. At present, the pile driver is widely used in foundation improvement of various buildings, housing construction, transportation, water conservancy and flood control, environmental protection, offshore drilling platform and wind power generation. In recent years, with the rapid development of underground engineering construction, the number of piles in underground engineering, especially in underground excavation stations, is increasing, but the pile-forming method is single, and manual digging piles is mostly adopted. However, manual digging pile has some defects, such as low construction efficiency, poor working environment, poor safety performance and high labor cost, which can no longer meet the needs of modern mechanized construction, and there are great safety risks in the digging process. Therefore, from April 20, 2019, Beijing requires that the manual digging pile operation in the underground excavation station in the city be completely stopped, and it is required to replace manual digging pile with mechanical construction of the hole pile.

Because the foundation of pile foundation is deep and the length of pile body is long, in order to realize the need of hole-forming, pile drivers are mostly erected on the ground, and are matched with pile driving frames to realize the lifting of drill rods, lowering of reinforcing cages and driving of precast piles. Moreover, because there are not too many obstacles at high altitude on the ground, in order to meet the requirements of pile length and facilitate construction, high pile driving frames are generally installed on the ground. However, for such a narrow space as the underground excavation station, it is impossible to place a high pile driving frame, resulting in a contradiction between the operating space of the existing site and the construction space required for piling.

The following hole-forming methods are usually used in pile foundation engineering, although their respective application ranges are different, but they can't all meet the requirements of hole-forming in underground holes.

1. Drilling with mud retaining wall: drilling with mud retaining wall includes positive and negative circulation, rotary drilling and submersible drilling. The drilling with mud retaining wall is characterized in that, no matter what kind of drilling rig is used, a mud pit must be built before the hole-forming operation, and the mud should continue to circulate in the hole wall,592510 during the drilling process of the drilling rig to maintain the stability of the hole wall. However, the narrow underground construction site can't provide the required working space for the mud pit. If the mud pit is set on the ground and then transported to the underground through the pipeline, it's quite uneconomical because of the deep depth of the underground station, and a large amount of mud produced during the construction pollutes the construction environment.

2. The whole set of casing drilling: the whole set of casing drilling generally includes rotary drilling and vibration drilling, in which vibration drilling has a certain vibration impact on the surrounding soil. In underground engineering, the excavation causes the instability of underground soil, so strong supporting measures must be taken to ensure the safety of excavation. Additional vibration further affects the stability of soil within the excavation scope and the safety of underground cavern, so it is not recommended to use vibration drilling. Relatively speaking, the impact of rotary drilling is much smaller, but the length of the casing used at present is too long to meet the needs of underground tunnel construction.

3. Dry drilling: dry drilling including manual digging, spiral drilling and rotary drilling, is generally applicable to cohesive soil, silty soil, filled soil, sandy soil and weathered rock above medium density above the groundwater level or after precipitation. Among them, manual digging requires water-free or less-water environment, and requires higher stability of the soil itself.

To sum up, the existing pile drivers can't work in the narrow underground space, and can't meet the high safety control requirements of underground projects, and some of them also cause noise, vibration, waste water and other impacts on the surrounding environment. The invention provides a dry drilling rig and a construction method for construction in a narrow underground space to solve the above problems.

The invention provides a dry drilling rig and a construction method for construction in a narrow underground space, which can realize dry drilling in the narrow underground space and has the characteristics of high safety performance, little environmental pollution and high construction efficiency.

The technical scheme adopted by the invention to solve the technical problems is as follows.

A dry drilling rig for construction in underground narrow space comprises a travelling system and a hole-forming system, the hole-forming system is arranged at one end of the travelling system and is provided with a travelling state and a working state; the travelling system comprises a travelling chassis, a hydraulic station, a winch and a landing gear, the hydraulic station, the winch and the landing gear are all arranged on the travelling chassis; the hole-forming system comprises a main frame, a power head, a casing driver, a casing, a drill rod and a drill bit, the main frame is movably connected to the travelling chassis and connected wifh;5p2510 the landing gear; the power head is arranged in the main frame and connected with the winch through a connecting rope; the power head and the landing gear are connected with the hydraulic station; the casing driver is arranged at lower part of the power head and keeps a same motion with the power head; the casing is connected to the lower part of the casing driver; the drill rod and the drill bit are positioned in the casing, the drill bit is arrange at a bottom end of the drill rod, and a top end of the drill rod is connected with the casing driver.

In an embodiment; the power head comprises a power seat and a connector; the power seat is arranged in the main frame; and the connector is arranged at a bottom for the power seat. The casing driver comprises a first connecting seat and a second connecting seat, the first connecting seat is fixedly connected with the connector, and the second connecting seat is located at the lower side of the first connecting seat.

In an embodiment, the casing includes casing unit sections, the upper and lower ends of casing unit sections are respectively provided with inner ring joints and outer ring joints, the inner ring joints and outer ring joints of adjacent casing unit sections are connected in a sleeved way, and the inner ring joint of the casing unit section at the top is fixedly connected with the second connecting seat.

In an embodiment, an outer wall of the inner ring joints are provided with a connecting plate, and the inner walls of the outer ring joint and the second connecting seat are provided with connecting grooves, and the connecting plate is located in the connecting grooves; the inner ring joints and the outer ring joints are provided with corresponding connecting holes, and the connecting holes are arranged at intervals along the circumference of the casing, and bolts are arranged in the connecting holes.

In an embodiment, the drill rod comprises drill rod units, adjacent drill rod units are connected by pin shafts, the drill rod unit at the top end is fixedly connected with the second connecting seat, and the drill rod unit at the bottom end is fixedly connected with the drill bit.

In an embodiment, the drill bit comprises a shaft, a drill plate and drill teeth, where the drill plate is arranged at the bottom end of the shaft, and the drill teeth are arranged on the drill plate at intervals.

In an embodiment, the travelling chassis comprises a travelling base, a turntable and legs, and the turntable and the legs are connected to the travelling base.

In an embodiment, the main frame comprises a main frame body, a first pin shaft seat and a second pin shaft seat, where the first pin shaft seat is arranged at the upper part of the main frame body and connected with the top end of the landing gear, and the second pin shaft seat is arranged at the lower part of the main frame body and connected with the outer end of th@)502510 turntable.

In an embodiment, the main frame body is provided with a fixed wheel, the power head is provided with a lifting wheel, and the connecting rope bypasses the fixed wheel and is connected with the lifting wheel. The main frame is provided with a slide rail in the length direction, and the power head is provided with a pulley which is arranged on the slide rail and moves along the slide rail.

A construction method of a dry drilling rig for construction in a narrow underground space includes the following steps: S1, burying a casing in a hole: manually excavating a hole at the pile position, making concrete retaining wall, and placing the casing unit sections; S2, putting the drilling rig in place: after moving the drilling rig to the drilling position and aligning with the hole position, changing the hole-forming system from a horizontal posture in a travelling state to a vertical posture in a working state; S3, putting the drill bit in place: after installing the drill bit, getting the drill bit into the hole, and then separating the drill bit from the casing driver and reserving the drill bit in the hole; S4, drill rod drilling: lifting the casing driver and installing the drill rod units, connecting the drill rod units with the drill bit in the hole, and drilling; after drilling to a depth of one drill rod unit, disconnecting the drill rod units from the casing driver and reserving the drill rod units in the hole; SS, casing drilling: lifting the casing driver and installing the casing unit sections, connecting the casing unit sections with the casing unit sections in the hole, and drilling; after drilling to the depth of one casing unit section, disconnecting the second casing unit section from the casing driver and reserving second casing unit section in the hole; S6, continuous drilling: carrying out the continuous construction in turn and circularly according to the drill rod drilling in S3 and then the casing drilling in step S4 until the drilling reaches a designed position; and S7, removing equipment: removing the equipment in the reverse order to the drilling operation, after removing the equipment, and performing the hole-forming check acceptance.

The invention has that follow beneficial effects.

The height requirement of the main frame is reduced by setting the casing and drill rod in sections, and the mechanized piling operation in the narrow space in the underground hole is realized by drilling of the drill rod first, then followed by the casing and multiple cycles for many times. The conventional mud retaining wall method is replaced by the construction method of assembling casting section by section, which has the characteristics of energy saving and environmental protection, and can flexibly adapt to the narrow underground space. It has the,5p2510 characteristics of high safety performance, little environmental pollution and high construction efficiency.

BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a schematic diagram of an overall structure of the present invention.

FIG. 2 is a top view of an overall structure of the present invention.

FIG. 3 is a schematic diagram of a main frame structure according to the present invention.

FIG. 4 is a schematic structural diagram of a power head according to the present invention.

FIG. 5 is a schematic structural diagram of a casing driver according to the present invention.

FIG. 6 is a schematic diagram of a structure of a casing unit section according to the present invention.

FIG. 7 is a schematic diagram of a drill rod structure of according to present invention.

FIG. 8 is a schematic diagram of a drill bit structure of according to the present invention.

Drawings: 1- travelling chassis, 110- travelling base, 120- turntable, 130- leg, 2- hydraulic station, 3- winch, 4- landing gear, 5- main frame, 51- main frame body, 52- first pin shaft seat, 53- second pin shaft seat, 54- fixed wheel, 6-power head, 61- power base, 62- connector, 63- lifting wheel, 7- casting driver, 71- first connecting seat, 72-second connecting seat, 8- casting, 81- inner ring joint, 82- outer ring joint, 83- connecting plate, 84- connecting groove, 85- connecting hole, 9- drill rod, 10- drill bit, 101- shaft, 102- drilling plate, 103- drilling teeth and 11- connecting rope.

DESCRIPTION OF THE INVENTION Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of them. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in the field without creative labor are within the scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the specification, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be understood as limiting the invention.

As shown in FIG. 1 and FIG. 2, a dry drilling rig for construction in underground narropy)s02510 space includes a travelling system and a hole-forming system, the hole-forming system is arranged at one end of the travelling system and is provided with a travelling state and a working state; the travelling system includes a travelling chassis 1, a hydraulic station 2, a winch 3 and a landing gear 4; the hydraulic station 2, the winch 3 and the landing gear 4 are all arranged on the travelling chassis 1; the hole-forming system comprises a main frame 5, a power head 6, a casing driver 7, a casing 8, a drill rod 9 and a drill bit 10; the main frame 5 is movably connected to the travelling chassis 1 and connected with the landing gear 4; the power head 6 is arranged in the main frame 5 and connected with the winch 3 through a connecting rope 11; the power head 6 and the landing gear 4 are connected with the hydraulic station 2; and the casing driver 7 is arranged at the lower part of the power head 6 and kept a same motion with the power head 6; the casing 8 is connected to the lower part of the casing driver 7, the drill rod 9 and the drill bit are located in the casing 8, the drill bit 10 is arranged at the bottom end of the drill rod 9, and the top end of the drill rod 9 is connected with the casing driver 7.

The principle of the invention is as follows: in a narrow underground space, because there is no large space for ground construction, it is necessary to reduce the absolute height of the structure for construction, and the casing 8 is composed of casing unit sections, and the drill rod 9 is composed of drill rod units. During construction, the power head 6 is connected to the main frame 5 and can move up and down along it, the casing driver 7 is connected to the power head 6, and the drill rod units and casing unit section are connected to the casing driver 7 in turn and circularly. Under the action of downward and rotational power by the power head 6, the drilling of the drill rod units, the footage of casing unit sections, the drilling of the drill rod units and the footage of casing unit sections are carried out in turn until the hole-forming is accomplished. After the hole-forming operation is completed, the disassembly is performed according to the reverse operation sequence.

As shown in FIG.4 and FIG.5, the power head 6 further comprises a power base 61 and a connector 62, the power base 61 is arranged in the main frame 5, and the connector 62 is arranged at the bottom of the power base 61. The casing driver 7 comprises a first connecting seat 71 and a second connecting seat 72, the first connecting seat 71 is fixedly connected with the connector 62, and the second connecting seat 72 is located at the lower side of the first connecting seat 71.

Furthermore, the connector 62 of the power base 61 is has retractable and rotating functions, and can drive the casing driver 7 to move up and down and rotate.

As shown in FIG. 6, the casing 8 further comprises casing unit sections, and the upper and lower ends of the casing unit sections are respectively provided with inner ring joints 81 and outer ring joints 82. The inner ring joints 81 and the outer ring joints 82 of the adjacent casing,5p2510 unit sections are sleeved with each other, and the inner ring joint 81 of the casing unit section at the top is fixedly connected with the second connecting seat 72.

As shown in FIG. 6, further, the outer wall of the inner ring joints 81 is provided with a connecting plate 83, and the inner walls of the outer ring joints 82 and the second connecting seat 72 are provided with a connecting groove 84. The connecting plate 83 is located in the connecting groove 84, and the matching between the connecting plate 83 and the connecting groove 84 has the functions of positioning, limiting and fixing alignment. The inner ring joints 81 and the outer ring joints 82 are provided with corresponding connecting holes 85, and the connecting holes 85 are circumferentially spaced along the casing 8, and bolts are arranged in the connecting holes 85.

The casing unit sections and the casing driver 7 are connected through sleeving connecting seat 72 on the inner ring joints 81 of the casing unit section, and the adjacent casing unit sections are connected through sleeving outer ring joints 82 of the upper casing unit sections on the inner ring joints 81 of the lower casing unit sections, one by one to form the casing 8.

Furthermore, the inner ring joints 81 of the casing unit sections are provided with a hoisting hole. It is used for lifting and removing the casing unit sections after the casing unit sections are pulled out.

Optionally, the lengths of the casing unit sections are 1 m. It is convenient for construction in underground narrow space.

The connection mode between the casing unit joints is as follows: the inner ring joints 81 of the lower casing unit joints are sleeved tightly by the outer ring joints 82 of the upper casing unit joints, and the connecting plate 83 on the outer wall of the inner ring joints 81 is stuck in the corresponding connecting groove 84 on the inner wall of the outer ring joints 82. Then, the casing unit joints are sequentially connected by bolts through the connecting holes 85 on the inner ring joints 81 and the outer ring joints 82.

As shown in FIG. 7, further, the drill rod 9 comprises drill rod units, adjacent drill rod units are connected by pin shafts, the drill rod unit at the top is fixedly connected with the second connecting seat 72, and the drill rod unit at the bottom is fixedly connected with the drill bit 10 by a pin shaft.

As shown in FIG. 8, the drill bit 10 further comprises a shaft 101, a drill plate 102 and drill teeth 103, the drill plate 102 is arranged at the bottom of the shaft 101, and the drill teeth 103 are arranged on the drill plate 102 at intervals.

Optionally, the drill plate 102 is a V-shaped steel plate, and five drill teeth 103 are welded,502510 on both sides, and the drill teeth 103 are bucket teeth of a digging machine. Excavating soil by bucket teeth of excavator can effectively improve drilling efficiency.

Optionally, the drill rod 9 comprises a shaft and spiral blades, the spiral blades are arranged on the shaft, the spiral blades of adjacent drill rods 9 are butted with each other, and the shaft 101 of the drill bit 10 is provided with spiral blades which are butted with the spiral blades on the drill rod 9.

As shown in FIG. 1, the travelling chassis 1 further comprises a travelling base 110, a turntable 120 and legs 130, and the turntable 120 and legs 130 are connected to the travelling base 110.

As shown in FIG. 3, the main frame 5 further comprises a main frame body 51, a first pin shaft seat 52 and a second pin shaft seat 53, the first pin shaft seat 52 is arranged at the upper part of the main frame body 51 and connected with the top end of the landing gear 4, and the second pin shaft seat 53 is arranged at the lower part of the main frame body 51 and connected with the outer end of the turntable 120. 4 When the landing gear is retracted, the main frame 5 is in a horizontal posture in a travelling state, which is convenient for transportation. After arriving at the construction site, the landing gear 4 extends out, and the main frame 5 is adjusted from the horizontal posture in travelling state to the vertical posture in working state, which is convenient to move in the narrow underground space.

As shown in FIG. 3, further, the main frame body 51 is provided with a fixed wheel 54, the power head 6 is provided with a lifting wheel 63, and the connecting rope 11 bypasses the fixed wheel 54 and is connected with the lifting wheel 63. The main frame 5 is provided with a slide rail in the length direction, and the power head 6 is provided with a pulley, the pulley is arranged on the slide rail and moves along it. The pulley block composed of the fixed wheel 54 and the lifting wheel 63 plays the role of lifting and lowering the power head 6, and realizes the vertical movement of the power head 6 by the cooperation of the pulley and the slide rail.

A construction method of a dry drilling rig for construction in a narrow underground space includes the following steps: S1, burying a casing in a hole: manually excavating a hole with a depth of 1 m at the pile position, making concrete retaining wall for the pile hole, and placing the casing unit sections; S2, putting the drilling rig in place: after moving the drilling rig to the drilling position and aligning with the hole position, changing the hole-forming system from a horizontal posture in the travelling state to a vertical posture in the working state;

S3, putting the drill bit in place: after installing the drill bit (10), getting the drill bit into the,5p2510 holes, and then disassembling the drill bit (10) from the casing driver (7) and reserving the drill bit the in the hole; S4, drill rod drilling: lifting the casing driver (7) and installing the drill rod units, connecting the drill rod units with the drill bit in the hole, and drilling; after drilling to a depth of one drill rod unit, disconnecting the drill rod units from the casing driver 7 and reserving drill rod units in the hole; SS, casing drilling: lifting the casing driver 7 and installing the casing unit sections, connecting the casing unit sections with the casing unit sections in the hole, and drilling; after drilling to the depth of one casing unit section, disconnecting the second casing unit section from the casing driver 7 and reserving second casing unit section in the hole; S6, continuous drilling: carrying out the continuous construction in turn and circularly according to the drill rod drilling in S3 and then the casing drilling in step S4 until the drilling reaches a designed position; and S7, removing equipment: removing the equipment in the reverse order to the drilling operation, after removing the equipment, and performing the hole-forming check and acceptance.

Further, during the drilling process, the soil residues is unearthed through the spiral blades on the outside of the shaft.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the invention is defined by the appended claims rather than the above description. Therefore, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be included in the invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims (10)

CLAIMS LU502510

1. À dry drilling rig for construction in underground narrow space, comprising a travelling system and a hole-forming system, wherein the hole-forming system is arranged at one end of the travelling system and provided with a travelling state and a working state; the travelling system comprises a travelling chassis (1), a hydraulic station (2), a winch (3) and a landing gear (4), wherein the hydraulic station (2), the winch (3) and the landing gear (4) are all arranged on the travelling chassis (1); the hole-forming system comprises a main frame (5), a power head (6), a casing driver (7), a casing (8), a drill rod (9) and a drill bit (10), wherein the main frame (5) is movably connected with the travelling chassis (1) and is connected with the landing gear (4), and the power head (6) is arranged on the main frame (5) and is connected with the winch (3) through a connecting rope (11); the casing driver (7) is arranged at a lower part of the power head (6) and keeps a same motion with the power head (6), the casing (8) is connected to a lower part of the casing driver (7), the drill rod (9) and the drill bit (10) are located in the casing (8), and the drill bit (10) is arranged on the drill rod (9) and a top end of the drill rod (9) is connected with the casing driver (7).

2. The dry drilling rig for construction in underground narrow space according to claim 1, wherein the power head (6) comprises a power base (61) and a connector (62), wherein the power base (61) is arranged in the main frame (5) and the connector (62) is arranged at a bottom of the power base (61); the casing driver (7) comprises a first connecting seat (71) and a second connecting seat (72), wherein the first connecting seat (71) is fixedly connected with the connector (62), and the second connecting seat (72) is located at a lower side of the first connecting seat (71).

3. The dry drilling rig for construction in underground narrow space according to claim 2, wherein the casing (8) comprises casing unit sections, and upper and lower ends of the casing unit sections are respectively provided with inner ring joints (81) and outer ring joints (82), and the inner ring joints (81) and the outer ring joints (82) of adjacent casing unit sections are sleeved with each other, and a casing unit section at the top is fixedly connected with the second connecting seat (72).

4. The dry drilling rig for underground construction in narrow space according to claim 3, wherein the outer wall of the inner ring joints (81) is provided with a connecting plate (83), and the inner walls of the outer ring joints (82) and the second connecting seat (72) are provided with a connecting groove (84), and the connecting plate (83) is located in the connecting groove (84); the inner ring joints (81) and the outer ring joints (82) are provided with corresponding connecting holes (85), and the connecting holes (85) are arranged at intervals along the circumference of the casing (8), and bolts are arranged in the connecting holes.

5. The dry drilling rig for construction in underground narrow space according to claim B;5p2510 wherein the drill rod (9) comprises drill rod units, adjacent drill rod units are connected by pin shafts, the drill rod unit at the top is fixedly connected with the second connecting seat (72), and the drill rod unit at the bottom is fixedly connected with the drill bit (10).

6. The dry drilling rig for construction in underground narrow space according to claim 3, wherein the drill bit (10) comprises a shaft (101), a drill plate (102) and a drill teeth (103), wherein the drill plate (102) is arranged at the bottom end of the shaft (101) and the drill teeth (103) are arranged at intervals on the drill plate (102).

7. The dry drilling rig for construction in underground narrow space according to claim 1, wherein the travelling chassis (1) comprises a travelling base (110), a turntable (120) and legs (130), and the turntable (120) and legs (130) are connected to the travelling base (110).

8. The dry drilling rig for construction in underground narrow space according to claim 7, wherein the main frame (5) comprises a main frame body (51), a first pin shaft seat (52) and a second pin shaft seat (53), wherein the first pin shaft seat (52) is arranged at an upper part of the main frame body (51) and connected with a top of the landing gear (4); wherein the second pin shaft seat (53) is arranged at a lower part of the main frame body (51) and connected with an outer end of the turntable (120).

9. The dry drilling rig for construction in underground narrow space according to claim 8, wherein the main frame body (51) is provided with a fixed wheel (54), the power head (6) is provided with a lifting wheel (63), and the connecting rope (11) bypasses the fixed wheel (54) and is connected with the lifting wheel (63); the main frame (5) is provided with a slide rail in a length direction, the power head (6) is provided with a pulley, and the pulley is arranged on the slide rail and moves along the slide rail.

10. A construction method of a dry drilling rig for construction in a narrow underground space according to any of claims 1-9, comprising the following steps: S1, burying a casing in a hole: manually excavating a hole at the pile position, making concrete retaining wall, and placing the casing unit sections; S2, putting the drilling rig in place: after moving the drilling rig to the drilling position and aligning with the hole position, changing the hole-forming system from a horizontal posture in a travelling state to a vertical posture in a working state; S3, putting the drill bit in place: after installing the drill bit, getting the drill bit into the hole, and then separating the drill bit from the casing driver and reserving the drill bit in the hole; S4, drill rod drilling: lifting the casing driver (7) and installing the drill rod units, connecting the drill rod units with the drill bit (10) in the hole, and drilling; after drilling to a depth of one drill rod unit, disconnecting the drill rod units from the casing driver (7) andj50p2510 reserving the drill rod units in the hole;

SS, casing drilling: lifting the casing driver (7) and installing the casing unit sections, connecting the casing unit sections with casing unit sections in the hole, and drilling; after drilling to a depth of one casing unit section, disconnecting a second casing unit section from the casing driver (7) and reserving the second casing unit section in the hole;

S6, continuous drilling: carrying out the continuous construction in turn and circularly according to the drill rod drilling in S3 and then the casing drilling in step S4 until the drilling reaches a designed position; and

S7, removing equipment: removing the equipment in the reverse order to the drilling operation, after removing the equipment, and performing the hole-forming check acceptance.