CN207673287U - A kind of jet-propelled high-efficiency helical drilling tool - Google Patents

Abstract

The utility model relates to the drilling technology in soil or soft rock, in particular to a jet-type high-efficiency helical drilling tool. The jet-type high-efficiency auger drill of the utility model comprises a jet-type drill bit and a jet-type auger drill rod, and one end of the jet-type auger drill rod is coaxially connected with the jet-type drill bit. Advantages: It can better solve technical problems such as high energy consumption and difficult chip removal in the auger drilling process, can effectively improve the ROP and chip removal efficiency of auger drilling, and is suitable for drilling rock and soil with high moisture content layer, which can make the auger drilling method better serve the construction technology fields such as non-excavation, rock and soil grouting and reinforcement, pile foundation and engineering geological survey and sampling.

Description

A jet-type high-efficiency auger drilling tool

technical field

The utility model is mainly used for drilling and forming holes in soil or soft rock, and can be widely used in various construction technical fields such as non-excavation, rock and soil grouting and reinforcement, pile foundation, engineering geological survey and sampling, etc., and particularly relates to a A jet-type high-efficiency auger drilling tool.

Background technique

Auger Boring Tools (AugerBoring Tools) is a drilling tool used in auger drilling, which is mainly composed of a drill bit, a core tube and a helical wing. Auger drilling (Auger Boring) is a non-circulation rotary drilling method, which is suitable for drilling holes in soil layers and soft rock formations. It is a dry mechanical rotary drilling method that uses auger drilling tools to store and transport cuttings. There is no flushing medium (dry drilling) in the hole during the drilling process, so it does not rely on the circulation of the flushing medium to remove the drill cuttings broken by the drill bit. Auger drilling can be divided into two types: long auger drilling and short auger drilling. The long auger drilling refers to the auger drilling tools in the axial pressure P (on-bit WOB) and rotary torque N (rotary speed Rotary Speed) Under the combined action, the drill bit is driven to rotate and cut the rock and soil mass, and the drill cuttings are driven by the rotary drilling tool to continuously rise along the helical fins to the surface and be discharged out of the hole. The drill bit breaks the rock and soil mass without lifting the drill during the entire drilling process The two processes of drilling footage and discharging drill cuttings are carried out simultaneously, without repeated crushing, and without the influence of liquid column pressure, so the drilling efficiency is high; while short helical drilling means that the helical drilling tool is under the pressure P of the axial center and the rotational moment N Under the joint action, the drill bit is driven to rotate and cut the rock and soil mass, and the drill cuttings are driven by the rotary drilling tool to continuously rise along the helical fins and temporarily store in the space formed by the helical fins. When drilling, the drill cuttings are lifted to the surface together with the whole set of drilling tools, and the drill cuttings accumulated on the helical fins are thrown off by reversing the drilling tool. Therefore, the operation process of short auger drilling is carried out intermittently, and the drilling efficiency is lower than that of long auger drilling. However, due to the small slewing resistance torque, the equipment load is small, and the power consumption is much smaller.

In the process of auger drilling, there is no flushing fluid circulation and no need for stabilizing fluid wall protection, which can save slurry making and circulation equipment such as mixers and mud pumps, thus reducing construction costs to a certain extent; low noise and vibration during drilling, And without waste slurry treatment, it can be called a veritable "green" construction method. During long helical drilling, the drill bit breaks the rock and soil mass and removes chips simultaneously, so the energy consumed on the drilling tool is relatively large, so that the diameter and depth of the hole are greatly limited by the drilling equipment (generally speaking, the hole diameter can reach 800mm, and the hole depth can reach 27.5m); in comparison, when drilling with a short helix, the energy consumed on the drill tool for chip removal is much smaller than that of a long helix, so its rotational resistance torque, equipment load and power The consumption is also much smaller than that of long helical drilling, so that short helical drilling can form larger and deeper boreholes (generally speaking, the hole diameter can reach 1.5-2m, and the hole depth can reach 30m).

Due to the many advantages of the auger drilling method, it has been widely used in many construction technology fields such as non-excavation, rock and soil grouting and reinforcement, pile foundation and engineering geological survey and sampling. Trenchless construction technology (Trenchless Technology or No-Dig) is a technology that detects, inspects, lays, repairs and replaces various underground pipelines without excavating the surface, and can be widely used in crossing roads, buildings, rivers and lakes The laying, testing, repairing and updating of pipelines such as oil and gas, water supply and drainage, cables, communication lines, etc. in historical sites, historic sites, etc. have the advantages of not affecting traffic, not polluting the environment, safe and reliable construction, short cycle, low overall cost, and social benefits. It has many advantages that cannot be compared with the traditional open cut method; the auger drilling method can be directly used to drill holes in the operation of laying underground pipelines without excavation, and can also be coupled with pipe jacking or other construction methods It can realize efficient drilling and pipe laying operations, and has played an important role in the field of trenchless construction technology and has broad application prospects. Grouting and reinforcement of rock and soil is to inject some grout with cementation and solidification properties into the pores, cracks or caves of rock and soil, and after it solidifies and hardens, it can prevent seepage, Construction technologies for plugging, reinforcement and deviation correction, including methods such as static pressure grouting, high-jet grouting, electrochemical grouting, etc. Spiral drilling method can be used to drill grouting holes required for grouting in grouting construction . Pile Foundation (Pile Foundation) is a deep foundation composed of foundation piles and caps placed on the pile top. For most types of pile foundations, the pile holes need to be drilled before the pile is formally formed, except for In addition to the pile hole that can be drilled using the auger drilling method, the screw (grain) pile is a pile foundation type with excellent performance. Engineering Geological Exploration and Sampling (Engineering Geological Exploration and Sampling) is a reliable method to directly go deep into the underground rock and soil to obtain the required engineering geological condition data and to ascertain the deep geological conditions. Using auger sampling is a commonly used field drilling sampling method. Commonly used in field portable manual rotary sampling operations.

Spiral drilling is a typical dry drilling method, especially in dry soil with a high ROP, but for the soil layer with a slightly higher moisture content, due to the influence of water, the soil is easy to muddy, thus On the other hand, water will reduce the friction coefficient between the drill cuttings and the spiral fins, thus increasing the difficulty of chip removal to a certain extent, and the drill cuttings are easy to slide off the spiral fins And gather at the bottom of the hole, reducing the drilling speed. In addition, even if an auger drill is used to drill into dry soil, due to the influence of the axial pressure (bit pressure P), it is inevitable that the rock and soil will have a compaction effect. On the one hand, it increases the difficulty of the drill bit to break the rock and soil. On the one hand, it also increases the frictional resistance during the ascent of the cuttings along the helical fins, thereby increasing the energy consumption during the helical drilling process.

Utility model content

The technical problem to be solved by the utility model is to provide a jet-type high-efficiency helical drilling tool, which effectively overcomes the defects of the prior art.

The technical solution of the utility model to solve the above-mentioned technical problems is as follows: a jet-type high-efficiency auger drill includes a jet-type drill bit and a jet-type auger rod, and one end of the jet-type auger rod is coaxially connected with the jet-type drill bit.

The beneficial effects of the utility model are: it can better solve the problem of high energy consumption and difficulty in chip removal during the auger drilling process, improve the mechanical drilling speed and chip removal efficiency of auger drilling, and enable the auger drilling method to better serve It is used in construction technology fields such as non-excavation, geotechnical grouting and reinforcement, pile foundation and engineering geological survey and sampling.

On the basis of the above technical solutions, the utility model can also be improved as follows.

Further, the above jet drill bit includes a central tube, three stepped fins and cutting teeth;

The center tube is hollow inside and has an open end;

The three above-mentioned stepped fins are uniformly arranged on the outer wall of the above-mentioned central tube along the length direction of the above-mentioned central tube, and the tangent line between each of the above-mentioned stepped fins and the central tube is perpendicular to the corresponding stepped fin;

One end of the jet-type auger rod is connected to the open end of the central pipe;

The closed end of the central tube is located on both sides of the above-mentioned cutting teeth, and there are first bottom spray holes communicating with the inside thereof;

The end surface of the above-mentioned stepped fin facing away from the above-mentioned central tube is set as a stepped surface, and the above-mentioned stepped surface is raised layer by layer along the direction from the closed end of the above-mentioned central tube to the open end;

First injection holes communicating with the interior of the central tube are evenly distributed on both sides of the stepped fins and on the stepped surface.

The beneficial effect of adopting the above-mentioned further scheme is that the jet drill bit has a simple structure, good rock-soil crushing effect, can effectively dry the rock-soil mass, and alleviate the compaction of the rock-soil mass due to the combined effect of the axial pressure P and the rotational moment N. The compaction effect reduces the compactness of the rock and soil mass, helps the crushing of the rock and soil mass and the removal of drill cuttings, and can reduce the frictional heat generated by the stepped fins during rotary cutting of the broken rock and soil mass, and helps to extend the life of the drill bit. service life, an air film can be formed near the surface of the stepped fins and the bottom wall of the central tube, which helps to reduce the frictional resistance between the rock and soil mass, drilling cuttings, and the stepped fins and the bottom wall of the central tube to a certain extent, thereby It helps to reduce the energy consumption in the auger drilling process, and has the beneficial effect of energy saving and emission reduction.

Further, each of the above-mentioned stepped fins is provided with a cavity communicating with the interior of the above-mentioned central pipe, and the above-mentioned first bottom spray hole and the first spray hole are respectively communicated with the interior of the above-mentioned central pipe through the cavity inside the above-mentioned stepped fin. .

The beneficial effect of adopting the above further solution is that the design is simple and reasonable, and it is convenient for the first bottom spray hole and the first spray hole to communicate with the central pipe respectively.

Further, the jet-type auger rod includes a core tube and a helical fin, the core tube is a tube with two ends open, one end of which is connected to and communicated with the opening end of the central tube, and the helical fin is formed by one end of the core tube The other end is spirally arranged on the above-mentioned core pipe, and the above-mentioned spiral fin has a spiral-shaped cavity matching it, and the outer wall of the above-mentioned core pipe is provided with a spiral-shaped air intake cavity matching the above-mentioned spiral fin , the above-mentioned air intake cavity communicates with the inside of the above-mentioned core tube, the above-mentioned cavity communicates with the above-mentioned air intake cavity, and a plurality of second injection holes communicating with the internal cavity of each of the above-mentioned spiral fins are evenly distributed on both sides, and the above-mentioned On the outer wall of the core tube, there are evenly distributed a plurality of third injection holes communicating with the inside between two adjacent spiral fins.

The beneficial effect of adopting the above-mentioned further solution is that the structure of the jet auger drill rod is simple, and the airflow ejected from the core pipe through the second injection hole and the third injection hole will directly act on the airflow stored in the helical fins and contact with the core pipe. On the drill cuttings, it can simultaneously dry the drill cuttings, reduce the compaction effect of the drill cuttings, increase the upward thrust of the drill cuttings along the spiral fins, and form an air film near the outer wall of the core tube to reduce the contact between the drill cuttings and the core. There are many beneficial effects such as reducing the frictional resistance between the outer walls of the pipe, reducing the energy consumption of chip removal, energy saving and emission reduction.

Further, all the third injection holes are distributed on the outer wall of the core pipe at equal intervals in a helical shape.

The beneficial effect of adopting the above further solution is that the layout is reasonable, so that the third injection holes can be evenly arranged on the core tube, ensuring that each part of the core tube has a better chip removal effect.

Further, the opening end of the above-mentioned central tube is integrally formed with a hollow threaded connection section communicating with it, which has an internal thread on the inside, and an external thread on the outer wall of one end of the above-mentioned core tube, and one end of the above-mentioned core tube is threadedly connected to the above-mentioned thread. within the connection segment.

The beneficial effect of adopting the above further solution is that the design is simple, and the connection between the central tube and the core tube is convenient.

Further, the outer circumference of the opening end of the central tube is provided with a first flange, the outer circumference of one end of the core tube is provided with a second flange, one end of the core tube is docked with the opening end of the central tube, and the first The flange plate and the second flange plate are fixed through bolt connection, and a sealing ring is arranged between the two.

The beneficial effect of adopting the above further solution is that the design is simple, and the connection between the central tube and the core tube is relatively firm.

Further, an annular support frame is coaxially sleeved outside the open end of the central tube, and the support frame is respectively connected and fixed to the end faces of the three stepped fins away from the closed end of the central tube.

The beneficial effect of adopting the above further solution is to improve the stability of the stepped fins and ensure the durability of the entire drill bit.

Description of drawings

Fig. 1 is the overall structure schematic diagram of jet-type high-efficiency auger drilling tool of the present utility model;

Fig. 2 is the bottom view of the jet-type high-efficiency helical drilling tool of the present utility model;

Fig. 3 is the structural schematic diagram when the jet-type high-efficiency helical drilling tool of the present invention cooperates with the pipe jacking method to drill into a horizontal hole;

Fig. 4 is the exploded view of the structure of the jet-type high-efficiency helical drilling tool of the present utility model;

Fig. 5 is an axonometric view of an embodiment of the jet drill in the jet high-efficiency helical drilling tool of the present invention;

Fig. 6 is an axonometric view of another embodiment of the jet drill bit in the jet high-efficiency helical drilling tool of the present invention;

Fig. 7 is a schematic structural view of the jet-type auger rod in the jet-type high-efficiency auger drilling tool of the present invention;

Fig. 8 is a cross-sectional view of the jet-type auger rod in the jet-type high-efficiency auger drilling tool of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Jet drill bit, 2. Jet auger drill pipe, 3. Pipeline, 4. Sealing ring, 11. Center tube, 12. Step fins, 13. Cutter, 14. Thread connection section, 15. First method Blue plate, 16, support frame, 21, core pipe, 22, helical fin, 111, the first bottom spray hole, 121, the first spray hole, 211, air intake cavity, 212, the third spray hole, 213, the first spray hole Two flanges, 221, the second injection hole.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

Embodiment: As shown in Figures 1, 2, 3, 4, 7, and 8, the jet-type high-efficiency auger drill of this embodiment includes a jet-type drill bit 1 and a jet-type auger rod 2, and the above-mentioned jet-type auger rod 2 One end is coaxially connected with the above-mentioned jet drill bit 1.

The above jet drill bit 1 comprises a central tube 11, three stepped vanes 12 and cutting teeth 13;

The above-mentioned central tube 11 is hollow inside and has an opening at one end;

The three above-mentioned stepped fins 12 are evenly arranged on the outer wall of the above-mentioned central tube 11 along the length direction of the above-mentioned central tube 11, and the tangent line between each of the above-mentioned stepped fins 12 and the central tube 11 is the same as that of the corresponding stepped fins. 12 vertical;

One end of the jet-type auger rod 2 is connected to the open end of the central pipe 11;

The closed end of the central tube 11 is located on both sides of the cutting teeth 13, respectively, with first bottom spray holes 111 communicating with the inside thereof;

The end surface of the stepped fin 12 facing away from the central tube 11 is set as a stepped surface, and the stepped surface is raised layer by layer along the direction from the closed end of the central tube 11 to the open end;

First injection holes 121 communicating with the inside of the central tube 11 are evenly distributed on both sides of the stepped fin 12 and on the stepped surface.

Above-mentioned spray type auger rod 2 comprises core pipe 21 and helical fin 22, and above-mentioned core pipe 21 is the tubular body of opening at both ends, and its one end is connected with the open end of above-mentioned center pipe 11 and communicates, and above-mentioned helical fin 22 is formed by above-mentioned One end of the core tube 21 is spirally arranged on the above-mentioned core tube 21 to the other end, and there is a helical cavity matching it in the above-mentioned helical fin 22, and the outer wall of the above-mentioned core tube 21 is provided with the above-mentioned helical fin. 22 matching spiral air intake chamber 211, the above-mentioned air intake chamber 211 communicates with the inside of the above-mentioned core pipe 21, the above-mentioned cavity communicates with the above-mentioned air intake chamber 211, and the two sides of each above-mentioned spiral wing 22 are respectively evenly distributed with A plurality of second injection holes 221 communicating with the internal cavity, and a plurality of third injection holes 212 communicating with the inside are evenly distributed on the outer wall of the core tube 21 between two adjacent spiral fins 22 .

Before construction, install the jet drill bit 1, the jet auger drill pipe 2 (can be connected to a single piece, or can be connected axially by multiple pieces) and other auxiliary equipment (including: drilling rig) in the opposite direction to the direction to be drilled. , air compressor or air pump, air supply hose, dynamic sealing joint, etc.). It should be pointed out that: since the utility model needs to use compressed air, it is necessary to ensure the airtightness of the entire drilling tool passage during the whole process of implementing the helical drilling. ), rotary torque N (Rotary Speed) and the air supply Q of the air compressor or air pump must be determined through experiments, which can be flexibly adjusted according to the actual situation during the drilling process, so as to ensure the normal drilling footage and the smooth removal of cuttings As a basis for adjusting parameters, the utility model can be used to drill both vertical holes and horizontal holes; It is a horizontal hole; while rock and soil grouting and reinforcement include both vertical holes and horizontal holes or drilling holes at other angles, which are determined comprehensively depending on the formation and groundwater conditions. specifically:

(1) Take drilling a vertical hole as an example to describe the embodiment of the present utility model: connect each part in sequence to form a complete set of drilling tools, start the drilling rig, air compressor or air pump placed outside the hole (ground), and the rotation of the drilling rig The device drives the jet-type auger drill pipe 2 and the jet-type drill bit 1 to rotate, and the drilling rig provides the axial pressure P (weight on drill WOB) and rotation torque N (rotary speed) required for auger drilling, and the air compressor or air pump Provide compressed air. The cutting teeth 13 and the stepped fins 12 can rotate to cut the rock and soil mass, and the airflow ejected from the first bottom spray hole 111 can assist the cutting teeth 13 to break the rock and soil mass at the bottom of the hole, and at the same time help to reduce the rock and soil mass at the bottom of the hole. compaction effect, remove drill cuttings, and reduce the temperature rise after the friction between the cutting teeth 13 and the rock and soil mass; the airflow ejected from both sides of the stepped fin 12 and the first injection hole 121 on the stepped surface can assist the stepped wing The sheet 12 breaks the rock and soil around the bottom of the hole and the wall of the hole, and also helps to reduce the compaction effect of the rock and soil at the bottom of the hole, remove drilling cuttings, and reduce the temperature rise after the friction between the stepped fins 12 and the rock and soil. The airflow ejected from both sides of the stepped fins 12 and the first injection holes 121 on the above-mentioned stepped surface can assist the stepped fins 12 to break the rock and soil around the bottom of the hole and the wall of the hole, and also help to reduce the pressure on the bottom of the hole and the hole wall. The compaction effect of the rock and soil around the wall, the removal of cuttings, and the reduction of the temperature rise after the friction between the stepped fins 12 and the rock and soil. The drill cuttings produced after the cutting teeth 13 and the stepped fins 12 are rotated to cut the rock and soil mass into the hole are passed through the area between the three stepped fins 12 at 120° to each other (the three stepped fins at 120° to each other The area between 12 can form the cuttings discharge guide groove) squeeze into the front end area of the jet-type auger rod 2, and gradually enter the helical fins 22 as the drilling process continues, and the cuttings will move along the helical fins 22 gradually rises; during this process, the airflow ejected from the second injection hole 221 and the third injection hole 212 will directly act on the drill cuttings stored in the section of the spiral fin 22, which can simultaneously dry the drill cuttings, Reduce the compaction effect of cuttings, increase the upward thrust of cuttings, and form an air film near the outer wall of the core tube 21 and spiral fin 22, which can reduce the friction between the cuttings and their outer walls, and reduce the chip removal performance. energy consumption, energy saving and emission reduction, and other beneficial effects; finally, the drill cuttings produced by the jet drill bit 1 placed at the front end of the auger drill will continuously go up along the jet auger rod 2 and be discharged out of the hole, thereby facilitating It can realize the synchronous progress of drilling and chip removal, and accelerate the construction progress of drilling.

If the construction of the utility model is a pile foundation hole, after the hole is drilled to the design depth requirement, the subsequent processes such as hole cleaning, lowering of the reinforcement cage, and pouring concrete into piles can be carried out; if the construction of the utility model is engineering geology In addition to using a drilling rig for survey and sampling drilling, in order to facilitate field sampling operations, a rotating handle can be added to the top of the drilling tool depending on the stratum conditions, and then the drilling operation is performed by manpower rotation; if the utility model is used for construction of rock and soil After the grouting and reinforcement holes are drilled to the design depth requirements, the subsequent processes such as lowering the grouting flower tube, placing the grouting plug, and pouring grout into the formation can be carried out.

(2) As shown in Figure 3, take drilling a horizontal hole as an example to illustrate the implementation of the present utility model: the main operation process is similar to that of drilling a vertical hole. It should be pointed out that if the utility model is adopted to carry out trenchless The construction work of laying underground pipelines, in addition to drilling horizontal holes alone, can also be used in conjunction with other suitable construction methods. The following is an example of pipe jacking method: First, it is necessary to drill at a suitable position on the construction site. Dig an initial working pit or shaft with suitable specifications, put the utility model, hydraulic pipe jacking machine, drilling rig and several sections of pipelines 3 into the initial working pit or shaft, and the hydraulic pipe jacking machine is used for jacking the pipeline 3 The outer diameter of the utility model should match the inner diameter of the pipeline 3. The utility model is placed in the pipeline 3, and the pipe jacking machine, drilling rig, air compressor or air pump are opened, and the hydraulic pipe jacking machine is pushed forward section by section. At the same time as the pipeline 3, the utility model can simultaneously realize the two processes of drilling and chip removal. After the pipe laying operation is completed, the utility model can be taken out by the drilling rig backwards along the drilled hole, and then the utility model, The hydraulic pipe jacking machine, drilling rig, etc. are hoisted from the initial working pit or shaft to the ground, thereby saving the process of excavating and receiving the working pit or shaft, and the whole process greatly speeds up the construction progress of laying underground pipelines without excavation.

When using the utility model to drill holes, the above-mentioned first bottom spray hole 111, the first spray hole 121, the third spray hole 212 and the second spray hole 221 arranged on the jet drill bit 1 and the jet drill rod 2 The ejected gas jet can realize the following six beneficial effects at the same time: ① assisting the drill bit in crushing the rock and soil mass; ② drying the rock and soil mass. It should be pointed out that hot air can also be injected when the water content of the rock and soil is high to enhance the drying effect on the rock and soil; The impact of the joint action of Speed) on the compaction effect of the rock and soil mass reduces the compactness of the rock and soil mass (especially the soil mass), which is helpful for the crushing of the rock and soil mass and the removal of drilling cuttings; ④ Interval design The first injection holes 121 on both sides of the three stepped fins 12 can be arranged in an inclined shape, and the direction of the inclination is opposite to the drilling direction, that is, the direction of inclination is consistent with the direction of cuttings removal. The airflow ejected from the first injection hole 121 arranged obliquely along the chip guide groove during the movement of the "guide groove" can increase the thrust of the cuttings moving along the direction of removal, which is helpful for the smooth removal of the cuttings; ⑤ It can reduce the friction and heat generated by the stepped fins 12 when they are rotating and cutting the broken rock and soil, which helps to prolong the service life of the drill bit; The thin film helps to reduce the frictional resistance between the rock and soil mass, drill cuttings and the surface of the stepped fin 12, the bottom of the central tube 11 and the surface of the core tube 21, thereby helping to reduce the equipment during the auger drilling process. Energy consumption has the beneficial effect of energy saving and emission reduction.

Preferably, each of the above-mentioned stepped fins 12 is provided with a cavity communicating with the interior of the above-mentioned central pipe 11, and the above-mentioned first bottom spray hole 111 and the first spray hole 121 pass through the cavity inside the above-mentioned stepped fin 12 respectively. The cavity communicates with the internal through hole of the above-mentioned central tube 11, so that the air flow passage can be realized inside the entire drill bit, which can reduce the manufacturing difficulty to a certain extent.

The central tube 11 and the stepped fins 12 are connected by welding, or other connection methods that can ensure the connection strength and airtightness.

Preferably, all the above-mentioned third injection holes 212 are distributed on the outer wall of the above-mentioned core tube 21 at equal intervals in a spiral shape, and this design enables the third injection holes 212 to cover the outer surface of the core tube 21 evenly and comprehensively. , which can effectively reduce the frictional resistance between the surface of the core tube 21 and the cuttings, thereby facilitating the removal of cuttings and energy saving and emission reduction.

In some embodiments, as shown in FIG. 5 , the open end of the above-mentioned central tube 11 is integrally formed with a hollow threaded connection section 14 communicating with it. The inner wall of the threaded connection section 14 has internal threads. One end of the above-mentioned core tube 21 There is an external thread on the outer wall, and one end of the above-mentioned core tube 21 is threaded into the above-mentioned threaded connection section 14. It should be noted that a raw material tape/hemp rope needs to be wound on the thread in advance to ensure the airtightness of the connection between the two. It is very convenient to connect and communicate between the central tube 11 and the core tube 14 .

In some other embodiments, as shown in FIG. 6, a first flange 15 is provided on the outer periphery of the opening end of the above-mentioned central tube 11, and a second flange 213 is provided on the outer periphery of one end of the above-mentioned core tube 21. The above-mentioned core One end of the pipe 21 is docked with the open end of the above-mentioned center pipe 11, the above-mentioned first flange 15 and the second flange 213 are connected by bolts, and a sealing ring 4 is arranged between the two. This design makes the center pipe 11 and the second flange 213 connected by bolts. The core tubes 21 are firmly connected and have good airtightness, but their installation is relatively cumbersome.

Preferably, an annular support frame 15 is coaxially sleeved outside the open end of the above-mentioned central tube 11, and the above-mentioned support frame 15 is respectively connected and fixed to the end faces of the three above-mentioned stepped fins 12 that are away from the closed end of the above-mentioned central tube 11. In this design, the three stepped fins 12 are integrated through the support frame 15, which improves the overall structural strength and reduces the failure rate of the stepped fins during drilling.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. a kind of jet-propelled high-efficiency helical drilling tool, it is characterised in that：Including jet bit (1) and injecting type auger stem (2), One end of the injecting type auger stem (2) and the jet bit (1) are coaxially connected；

The jet bit (1) includes central tube (11), three ladder fins (12) and cutting tooth (13)；

Central tube (11) inner hollow and one end open；

Length direction of three ladder fins (12) respectively along the central tube (11) is circumferentially uniformly arranged on the center It manages on (11) outer wall, and tangent line and the corresponding ladder fin of each the ladder fin (12) and central tube (11) junction (12) vertical；

One end of the injecting type auger stem (2) is connect with the open end of the central tube (11)；

The position that the blind end of the central tube (11) is located at the cutting tooth (13) both sides is respectively equipped with and internal is connected to it First bottom spray orifice (111)；

The ladder fin (12) is set as cascaded surface away from a side end face of the central tube (11), and the cascaded surface is along institute The direction for stating the blind end direction open end of central tube (11) successively increases；

It is evenly equipped on ladder fin (12) both sides and the cascaded surface and is connected to the inside of the central tube (11) respectively The first spray-hole (121).

2. a kind of jet-propelled high-efficiency helical drilling tool according to claim 1, it is characterised in that：Each ladder fin (12) the internal cavity for being equipped with and being connected to inside the central tube (11), first bottom spray orifice (111) and the first spray-hole (121) it is connected to respectively with the inside of the central tube (11) by the internal cavity of the ladder fin (12).

3. a kind of jet-propelled high-efficiency helical drilling tool according to claim 1, it is characterised in that：The injecting type auger stem (2) include core pipe (21) and helical wing plate (22), the core pipe (21) is the tube body of both ends open, one end and the central tube (11) open end is connected to and in communication with, and the helical wing plate (22) is set from one end of the core pipe (21) to the other end in the shape of a spiral It sets in the core pipe (21), there is matched spiral helicine cavity, the core pipe (21) in the helical wing plate (22) Outer wall be equipped with the matched spiral helicine inlet chamber (211) of the helical wing plate (22), the inlet chamber (211) with it is described The inside of core pipe (21) is connected to, and the cavity is connected to the inlet chamber (211), the both sides point of the every helical wing plate (22) It is not evenly equipped with multiple and its connects with the internal cavities the second spray-holes (221), is located at adjacent two panels on core pipe (21) outer wall Position between the helical wing plate (22) is evenly equipped with third spray-hole (212) of multiple its inside of connection.

4. a kind of jet-propelled high-efficiency helical drilling tool according to claim 3, it is characterised in that：Whole third injections What hole (212) was equidistantly spaced in the shape of a spiral is distributed on the core pipe (21) outer wall.

5. a kind of jet-propelled high-efficiency helical drilling tool according to claim 4, it is characterised in that：Central tube (11) are opened Mouth end is integrally formed equipped with the hollow threaded connection section (14) communicated therewith, and threaded connection section (14) inner wall has interior There is on one end outer wall of the core pipe (21) screw thread external screw thread, the threaded one end of the core pipe (21) to be connected to the screw thread In linkage section (14).

6. a kind of jet-propelled high-efficiency helical drilling tool according to claim 5, it is characterised in that：Central tube (11) are opened Mouth end periphery is equipped with first flange disk (15), and one end periphery of the core pipe (21) is equipped with second flange disk (213), described One end of core pipe (21) is docked with the open end of the central tube (11), the first flange disk (15) and second flange disk (213) fixation is bolted, and clips are equipped with sealing ring (4) between the two.

7. a kind of jet-propelled high-efficiency helical drilling tool according to any one of claims 1 to 6, it is characterised in that：The center Manage the supporting rack (16) of the outer coaxial sleeve in open end equipped with circular ring shape of (11), support frame as described above (16) respectively with three ladders Fin (12) is connected and fixed away from one end end face of the central tube (11) blind end.