Long spiral drilling tool

Abstract

The invention discloses a long spiral drilling tool which comprises an inner casing pipe, an outer casing pipe, an outer casing pipe and an inner casing pipe, the front end of the inner sleeve is movably sleeved with the rotary excavating drill bit, cutting teeth are arranged in the circumferential direction of the front end of the rotary excavating drill bit, and a guniting assembly is arranged at the front end of the rotary excavating drill bit; the outer side of the inner sleeve is sleeved with the outer sleeve, the outer sleeve is in transmission connection with the rotary digging drill bit, and spiral blades used for deslagging are arranged on the outer circumferential surfaces of the outer sleeve and the rotary digging drill bit; the piston is movably arranged between the inner sleeve and the outer sleeve, a first air chamber is formed among the outer sleeve, the piston and the inner sleeve, a second air chamber is formed among the piston, the rotary excavating drill bit, the outer sleeve and the inner sleeve, the air distribution channel is arranged in the outer sleeve, and the air distribution channel is alternately communicated with the first air chamber and the second air chamber. And the piston is driven to reciprocate in the axial direction of the inner sleeve so as to provide pulse acting force for the rotary excavating drill bit. Compared with the prior art, the long spiral drilling tool has the advantages that the drilling speed can be increased, and the construction efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of drilling equipment, and more specifically, to a long spiral drilling tool. Background Art

[0002] Long spiral drilling is widely used in the construction of pile foundation holes for buildings and bridges. In order to ensure the quality of pile foundations, the national construction standards have strict requirements on the depth of pile foundation holes, and the hole depth must be 1.5 to 2 times the hole diameter of the rock. The difficulty encountered in construction is that when the construction geological conditions include mixed rock layers or the hardness of the rock entering the rock is relatively high, the long spiral rotary drilling method is used to open the hole, and its drilling speed is very slow, which seriously affects the construction progress.

[0003] Therefore, there is an urgent need for a long spiral drilling tool that can increase the drilling speed and improve the construction efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a long spiral drilling tool, which can increase the drilling speed and improve the construction efficiency.

[0005] The technical solutions provided by this application are as follows: A long spiral drilling tool, comprising: An inner casing, wherein a grouting channel and a high-pressure air channel are provided inside the inner casing, and the high-pressure air channel is provided outside the grouting channel; A rotary drilling bit movably sleeved on the front end of the inner casing, wherein the front end of the rotary drilling bit is provided with cutting teeth in the circumferential direction, and the front end of the rotary drilling bit is provided with a shotcrete assembly; An outer sleeve is sleeved on the outside of the inner sleeve and is drivingly connected to the rotary drill bit, and the outer circumferential surfaces of the outer sleeve and the rotary drill bit are provided with spiral blades for slag removal; A piston movably arranged between the inner casing and the outer casing, a first air chamber is formed between the outer casing, the piston and the inner casing, and a second air chamber is formed between the piston, the rotary drill bit, the outer casing and the inner casing; An air distribution channel is connected to the high-pressure air channel, and the air distribution channel is alternately connected to the first air chamber and the second air chamber, driving the piston to reciprocate along the axial direction of the inner casing to provide a pulse force for the rotary drilling bit.

[0006] Preferably, it also includes: An exhaust port provided on the rotary drilling drill bit; An exhaust pipe is arranged in the rotary drilling bit, and the exhaust pipe is alternately connected with the second air chamber and the first air chamber; A one-way gas valve is arranged at the end of the exhaust pipe, and the one-way gas valve is used in conjunction with the exhaust port to allow gas to be discharged from the exhaust port from the exhaust pipe in one direction.

[0007] Preferably, the inner sleeve comprises: Grout pipe; A joint is sleeved on the outside of the rear end of the grouting pipe and is sealed and connected to the grouting pipe, the grouting channel is arranged in the axial direction of the joint and the grouting pipe, and the high-pressure airway is arranged at the front end of the joint; A check valve assembly is arranged in the joint and is used to open and close the high-pressure air passage.

[0008] Preferably, the high-pressure airway comprises: a first air channel disposed at a rear end of the connector; A second air passage is provided at the front end of the joint, wherein an outlet of the second air passage is communicated with the air distribution channel; a third air channel for connecting the first air channel and the second air channel, wherein the outlet of the third air channel extends to the outer surface of the connector, and a plug is provided at the outlet of the third air channel; The check valve assembly is arranged at the connection between the first air channel and the third air channel, and is used for opening and closing the first air channel.

[0009] Preferably, the check valve assembly comprises: A valve stem, wherein the rear end of the valve stem is provided with a tapered molding surface for opening and closing the first air passage; An elastic member connected to the valve stem has a compression state and a reset state. When the elastic member is in the compression state, the first air channel is connected to the third air channel. When the elastic member is in the reset state, the first air channel is isolated from the third air channel.

[0010] Preferably, the outer sleeve comprises: A first outer tube, the front end of which is drivingly connected to the rotary drill bit; A positioning member fixedly disposed in the first outer tube and used for limiting and restraining the axial displacement of the rotary drilling drill bit; a second outer tube sleeved inside the first outer tube, wherein two ends of the second outer tube are respectively in contact with the joint and the positioning member; A gas distribution component is fixedly sleeved between the second outer tube and the inner sleeve, and the gas distribution component and the inner sleeve are sealed and connected.

[0011] Preferably, the gas distribution assembly comprises: A gas distribution seat is fixedly sleeved on the outer side of the inner sleeve, and a first chamber is formed between the gas distribution seat and the joint, and the first chamber is used to communicate with the high-pressure airway; An inner cylinder is sleeved on the outer side of the front end of the valve seat and fixedly connected to the second outer tube, the piston is slidably disposed in the inner cylinder, and a second chamber is formed between the inner cylinder and the second outer tube; A gas passage is arranged in the gas distribution seat and is used to connect the first chamber and the second chamber.

[0012] Preferably, the gas distribution channel comprises: An air hole provided on the inner cylinder and communicating with the second chamber; A first annular groove is provided on the piston, wherein the first annular groove is recessed from the outer circumferential surface of the piston toward the axial direction of the piston; a second annular groove disposed on the second outer tube and communicating with the second air chamber, wherein the second annular groove is recessed from the inner wall of the second outer tube in a direction away from the axis; A third annular groove is provided on the inner cylinder and is used to connect the second annular groove and the first air chamber, wherein the third annular groove is recessed from the inner wall of the inner cylinder in a direction away from the axis; An exhaust passage is formed between the inner wall of the piston and the inner sleeve, and an outlet of the exhaust passage is communicated with the exhaust pipe.

[0013] Preferably, when the gas distribution channel is in communication with the second air chamber, the second chamber is in communication with the second air chamber through the first annular groove and the second annular groove, and the first air chamber is in communication with the exhaust pipe through the exhaust channel; When the gas distribution passage is connected to the first air chamber, the second chamber is connected to the first air chamber through the first ring groove, the second ring groove and the third ring groove, and the second air chamber is connected to the exhaust pipe through the exhaust passage.

[0014] Preferably, the rotary drilling drill bit comprises: A drill tail shank is arranged between the outer sleeve and the inner sleeve, and the drill tail shank is connected to the outer sleeve through a drill clamp sleeve; A seal disposed between the drill bit shank and the outer sleeve, and between the drill bit shank and the inner sleeve; An impact drill bit is arranged at the front end of the drill shank and fixedly connected to the drill shank.

[0015] The long spiral drill provided by the present invention is provided with an inner casing, a rotary drill bit and an outer casing, wherein a grouting channel is provided axially of the inner casing, a high-pressure air channel is provided outside the grouting channel, the grouting channel is used to accommodate and transport concrete, and the high-pressure air channel is provided outside the grouting channel for transporting high-pressure gas. The rotary drill bit is movably sleeved on the front end of the inner casing, and a pick is provided circumferentially on the front end of the rotary drill bit, and the pick is used to assist in drilling. A grouting assembly is also provided at the front end of the rotary drill bit, and the grouting assembly is connected with the grouting channel, and the grouting assembly is used to transport the concrete in the grouting channel into the hole. The outer casing is sleeved on the outside of the inner casing, and the outer casing is connected with the rotary drill bit in transmission. The outer circumferential surface of the outer casing and the rotary drill bit is provided with spiral blades for slag removal. During the drilling process, the power head gives the outer casing and the rotary drill bit a driving force to rotate and downward, and the rotary drill bit breaks rock. During the rotation of the outer casing and the rotary drill bit, the rock slag is discharged through the spiral blades.

[0016] Secondly, in order to further improve the efficiency of drilling, the long spiral drilling tool provided by the present invention also includes a piston and a gas distribution channel, wherein the piston is arranged between the inner sleeve and the outer sleeve, a first air chamber is formed between the outer sleeve, the piston and the inner sleeve, a second air chamber is formed between the piston, the rotary drill bit, the outer sleeve and the inner sleeve, the gas distribution channel is connected to the high-pressure airway, and the gas distribution channel is alternately connected to the first air chamber and the second air chamber, so that an air pressure difference is formed between the first air chamber and the second air chamber, pushing the piston to reciprocate along the axial direction of the inner sleeve, thereby providing a pulse force for the rotary drill bit, and the processing efficiency is higher. It can be seen that compared with the prior art, the long spiral drilling tool in the embodiment of the present invention is also provided with a piston and a gas distribution channel, which can provide a pulse force for the rotary drill bit, can increase the drilling speed, and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a long spiral drilling tool provided by an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of the rear end of the long spiral drilling tool provided; Figure 3 A schematic diagram of the structure of a long spiral drilling tool provided in an embodiment of the present invention (the second air chamber is for air intake and the first air chamber is for exhaust); Figure 4 for Figure 3 A partial enlarged view of the middle A; Figure 5 A schematic diagram of the structure of a check valve assembly provided in an embodiment of the present invention; Figure 6 for Figure 3 A structural schematic diagram of a central gas distribution channel; Figure 7 A schematic diagram of a structure of a long spiral drilling provided by an embodiment of the present invention (air intake in the first air chamber and exhaust in the second air chamber); Figure 8 for Figure 7 A structural schematic diagram of a gas distribution channel in; Fig. 9 A schematic structural diagram of a rotary drilling bit provided in an embodiment of the present invention.

[0019] Reference numerals: 11, grouting pipe; 111, grouting channel; 12, joint; 121, high-pressure airway; 1211, first airway; 1212, second airway; 1213, third airway; 1214, plug; 13, check valve assembly; 131, valve stem; 132, conical molding surface; 133, elastic member; 2, rotary drill bit; 21, pick; 22, shotcrete assembly; 24, exhaust pipe; 25, one-way air valve; 26, drill tail handle; 27, drill sleeve; 28, sealing member ; 29. ​​Impact drill bit; 31. Spiral blade; 32. First outer tube; 34. Positioning piece; 35. Second outer tube; 36. Gas distribution assembly; 361. Gas distribution seat; 362. First chamber; 363. Inner cylinder; 364. Second chamber; 365. Gas channel; 4. Piston; 41. First air chamber; 42. Second air chamber; 51. Air hole; 52. First ring groove; 53. Second ring groove; 54. Third ring groove; 55. Exhaust channel; 6. Rock and soil layer; 7. Concrete; 8. Bushing. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0025] The embodiments of the present invention are written in a progressive manner.

[0026] like Figures 1 to 9 As shown, it should be noted that in the drawings of the present application, a single arrow indicates the flow direction of high-pressure gas, and a double arrow indicates the flow direction of slag.

[0027] The embodiment of the present invention provides a long spiral drilling tool, comprising: an inner casing, a grouting channel 111 is arranged axially of the inner casing, and a high-pressure air channel 121 is arranged outside the grouting channel 111; a rotary drilling bit 2 movably sleeved on the front end of the inner casing, a cutting tooth 21 is arranged circumferentially on the front end of the rotary drilling bit 2, and a grouting assembly 22 connected to the grouting channel 111 is arranged at the front end of the rotary drilling bit 2; an outer casing sleeve sleeved on the outside of the inner casing and connected to the rotary drilling bit 2 in transmission, and the outer casing sleeve and the rotary drilling bit 2 are connected to the outer casing sleeve. The outer circumferential surface is provided with a spiral blade 31 for slag removal; a piston 4 is movably arranged between the inner sleeve and the outer sleeve, a first air chamber 41 is formed between the outer sleeve, the piston 4 and the inner sleeve, and a second air chamber 42 is formed between the piston 4, the rotary drill bit 2, the outer sleeve and the inner sleeve; an air distribution channel is connected to the high-pressure airway 121, and the air distribution channel is alternately connected to the first air chamber 41 and the second air chamber 42, driving the piston 4 to reciprocate along the axial direction of the inner sleeve, so as to provide a pulse force for the rotary drill bit 2.

[0028] The long spiral drill tool in the prior art includes a power head, a spiral drill rod and a spiral drill bit. The spiral drill bit is fixedly arranged at the front end of the spiral drill rod. A grouting pipe is arranged in the spiral drill rod. A pick is arranged at the front end of the spiral drill bit, and a grouting head is arranged at the front end of the spiral drill bit. In the process of the power head driving the spiral drill rod and the spiral drill bit to rotate, a downward impact force is applied to the spiral drill bit for drilling. After the drilling is completed, the grouting head is opened to pump concrete into the grouting pipe, and then the method of pouring while lifting the drill is adopted until the concrete is poured to the pile mouth position. After the pouring is completed, a steel cage is inserted into the cast-in-place pile, and a vibrating hammer is used to vibrate the concrete when inserting the steel cage to ensure the density of the concrete.

[0029] However, the current difficulty encountered in construction is that when the construction geological conditions include mixed rock layers or the hardness of the rock entering the rock is relatively high, the drilling speed is very slow when using a long spiral rotary drilling method to open a hole, which seriously affects the construction progress.

[0030] In order to solve this problem, the long spiral drill provided by the present invention is used for drilling holes in the rock and soil layer 6 with mixed rock layers or relatively high rock hardness in the construction condition. First, due to the provision of an inner casing, a rotary drilling bit 2 and an outer casing, a grouting channel 111 is axially provided in the inner casing, and a high-pressure air duct 121 is provided on the outside of the grouting channel 111. The grouting channel 111 is used to accommodate and transport concrete 7, and the high-pressure air duct 121 is provided on the outside of the grouting channel 111 for transporting high-pressure gas. The rotary drill bit 2 is movably sleeved on the front end of the inner casing, and a cutting tooth 21 is circumferentially arranged on the front end of the rotary drill bit 2. The cutting tooth 21 is used to assist in drilling. A grouting assembly 22 is also arranged at the front end of the rotary drill bit 2. The grouting assembly 22 is connected to the grouting channel 111. The grouting assembly 22 is used to transport the concrete 7 in the grouting channel 111 into the hole. The outer sleeve is sleeved on the outside of the inner sleeve. The outer sleeve is transmission-connected to the rotary drill bit 2. The outer circumferential surfaces of the outer sleeve and the rotary drill bit 2 are provided with spiral blades 31 for slag discharge. During the drilling process, the power head gives the outer sleeve and the rotary drill bit 2 a rotating and downward driving force, and the rotary drill bit 2 breaks rock. During the rotation of the outer sleeve and the rotary drill bit 2, the rock slag is discharged through the spiral blades 31.

[0031] Secondly, in order to further improve the drilling efficiency, the long spiral drilling tool provided by the present invention also includes a piston 4 and a gas distribution channel, wherein the piston 4 is arranged between the inner sleeve and the outer sleeve, a first air chamber 41 is formed between the outer sleeve, the piston 4 and the inner sleeve, a second air chamber 42 is formed between the piston 4, the rotary drill bit 2, the outer sleeve and the inner sleeve, and the gas distribution channel is connected to the high-pressure air channel 121, and the gas distribution channel is alternately connected to the first air chamber 41 and the second air chamber 42, so that an air pressure difference is formed between the first air chamber 41 and the second air chamber 42, pushing the piston 4 to reciprocate along the axial direction of the inner sleeve, thereby providing a pulse force for the rotary drill bit 2, and the processing efficiency is higher. It can be seen that compared with the prior art, the long spiral drilling tool in the embodiment of the present invention is also provided with a piston 4 and a gas distribution channel, which can provide a pulse force for the rotary drill bit 2, can improve the drilling speed, and improve the construction efficiency.

[0032] The rotary drill bit 2 in the present application is connected with the inner casing by transmission. A piston 4, an air distribution channel and a high-pressure air channel 121 are arranged between the inner casing and the outer casing. After the high-pressure gas passes through the high-pressure air channel 121 and the air distribution channel, it drives the piston 4 to move axially back and forth, thereby providing a pulse force for the rotary drill bit 2. Compared with the prior art, it can better improve the drilling efficiency, and can also ensure the construction efficiency when the construction geological conditions have mixed rock layers or the hardness of the rock entering the rock is relatively high.

[0033] Furthermore, as one of the embodiments, the long spiral drilling tool in the embodiment of the present invention also includes an exhaust port, an exhaust pipe 24 and a one-way air valve 25, wherein the exhaust port is arranged on the drilling bit, the exhaust pipe 24 is arranged in the rotary drilling bit 2, the outlet of the exhaust pipe 24 is connected to the exhaust port, the inlet of the exhaust pipe 24 is alternately connected to the second air chamber 42 and the first air chamber 41, and the one-way air valve 25 is arranged at the end of the exhaust pipe 24, and the one-way air valve 25 is used in conjunction with the exhaust port so that the gas can only be discharged from the exhaust port in one direction.

[0034] It should be noted that a one-way air valve 25 is provided at the end of the exhaust pipe 24 , and the exhaust gas in the outer casing can only be discharged to the outside of the outer casing through the exhaust pipe 24 , thereby preventing external gas and residue from entering the inside of the outer casing through the exhaust pipe 24 .

[0035] Specifically, when the outer sleeve is working, the exhaust gas in the outer sleeve needs to be discharged through the exhaust pipe 24 and the exhaust port. In order to prevent the residue outside the outer sleeve from entering the inner part of the outer sleeve through the exhaust port and the exhaust pipe 24, a one-way air valve 25 is provided at the end of the exhaust pipe 24. The gas can only be discharged from the exhaust port in one direction. The discharged exhaust gas blows up the residue at the bottom of the hole and is discharged through the spiral blade 31.

[0036] As one of the preferred implementations, the exhaust port in the embodiment of the present invention is arranged on the outside of the front end of the rotary drilling bit, and the exhaust port is used to discharge waste gas and to blow away the residue in the air to improve the slag discharge efficiency.

[0037] In the above structure, as one implementation method, Figure 4 As shown, the inner sleeve in the embodiment of the present invention includes a grouting pipe 11, a joint 12 and a check valve assembly 13, wherein the joint 12 is sleeved on the outer side of the rear end of the grouting pipe 11, the joint 12 is sealed and connected to the grouting pipe 11, the grouting channel 111 is arranged through the joint 12 and the grouting pipe 11 in the axial direction, the high-pressure airway 121 is arranged in the joint 12, the check valve assembly 13 is arranged in the joint 12, and the high-pressure airway 121 is opened and closed by the check valve assembly 13.

[0038] Specifically, when the check valve assembly 13 opens the high-pressure air passage 121, the high-pressure gas is alternately connected to the first air chamber 41 and the second air chamber 42 through the gas distribution channel. Due to the high-pressure gas difference between the first air chamber 41 and the second air chamber 42, the piston 4 is pushed to reciprocate along the axial direction of the inner sleeve, and the exhaust gas is discharged from the inside through the exhaust pipe 24.

[0039] More specifically, the high-pressure air passage 121 in the embodiment of the present invention is specifically an air pipe preset in the connector 12 .

[0040] In the above structure, as one of the implementation modes, a connector 12 is provided at the rear end of the joint 12 in the embodiment of the present invention, and the connector 12 is used to be connected to a drill rod, and concrete 7 is input into the grouting pipe 11 through the drill rod.

[0041] Furthermore, the connector 12 in the embodiment of the present invention is specifically a hexagonal connector 12 .

[0042] As one implementation mode, the joint 12 in the embodiment of the present invention is sleeved on the outer side of the rear end of the grouting pipe 11, and a positioning surface abutting against the rear end surface of the grouting pipe 11 is provided in the joint 12, so that a sealing connection is established between the joint 12 and the grouting pipe 11.

[0043] In the above structure, as one of the implementation modes, the high-pressure air channel 121 in the embodiment of the present invention includes a first air channel 1211, a second air channel 1212 and a third air channel 1213, wherein the first air channel 1211 is arranged at the rear end of the connector 12, the second air channel 1212 is arranged at the front end of the connector 12, the outlet of the second air channel 1212 is connected with the gas distribution channel, the third air channel 1213 is used to connect the first air channel 1211 and the second air channel 1212, the outlet of the third air channel 1213 extends to the outer surface of the connector 12, the plug 1214 is arranged in the connector 12, and the plug 1214 is arranged at the outlet of the third air channel 1213 to prevent the high-pressure gas from leaking from the outlet of the third air channel 1213, and the check valve assembly 13 is arranged at the connection between the first air channel 1211 and the third air channel 1213, and the first air channel 1211 is opened and closed by the check valve assembly 13. Specifically, the high-pressure gas enters the joint 12 from the first gas channel 1211, and then enters the gas distribution channel through the third channel and the second channel.

[0044] Furthermore, as one of the specific implementations, the third air duct 1213 in the embodiment of the present invention is provided with a threaded hole at one end away from the second air duct 1212, and a threaded line is provided on the outer circumferential surface of the plug 1214, and the plug 1214 and the third air duct 1213 are connected by threads.

[0045] Furthermore, as one of the specific implementations, the first air duct 1211 and the second air duct 1212 in the embodiment of the present invention are arranged in parallel along the axial direction of the grouting channel 111, the inlet of the first air duct 1211 extends to the rear end of the joint 12, and the outlet of the second air duct 1212 extends to the front end surface of the joint 12, and the third air duct 1213 is used to connect the outlet of the first air duct 1211 and the inlet of the second air duct 1212, and the third air duct 1213 is arranged perpendicular to the first air duct 1211 and the second air duct 1212.

[0046] Furthermore, as one implementation method, Figure 5 As shown, the check valve assembly 13 in the embodiment of the present invention includes a valve stem 131 and an elastic member 133, wherein the rear end of the valve stem 131 is provided with a conical molding surface 132 for opening and closing the first air channel 1211, and the elastic member 133 is connected to the valve stem 131, and the elastic member 133 has a compression state and a reset state. When the elastic member 133 is in the compression state, the first air channel 1211 and the third air channel 1213 are connected, and when the elastic member 133 is in the reset state, the first air channel 1211 and the third air channel 1213 are isolated.

[0047] As one of the specific implementation modes, the elastic member 133 in the embodiment of the present invention is specifically a spring, and the valve stem 131 includes a blocking section and a guide section, wherein the conical molding surface 132 is arranged on the blocking section, and the outer diameter of the conical molding surface 132 gradually increases from the blocking section to the guide section, and the outer diameter of the guide section is smaller than the maximum outer diameter of the conical molding surface 132, and the first air channel 1211 extends along the axial direction of the joint 12, and the valve stem 131 is sleeved on the front end of the first air channel 1211, and the elastic member 133 is sleeved on the outside of the guide section, and the two ends of the elastic member 133 are respectively abutted against the blocking section and the outer sleeve, and under the action of the high-pressure gas, the valve stem 131 is pushed to move toward the direction of the outer sleeve to compress the elastic member 133, and when the high-pressure gas is not passed into the high-pressure air channel 121, the elastic member 133 produces elastic reset deformation to push the valve stem 131 to close the first channel.

[0048] In the above structure, as one of the embodiments, the outer sleeve in the embodiment of the present invention includes a first outer tube 32, a positioning member 34, a second outer tube 35 and a gas distribution assembly 36, wherein the front end of the first outer tube 32 is fixedly connected to the drill sleeve 27, the drill sleeve 27 is connected to the drill bit in a transmission manner, the positioning member 34 is fixedly arranged on the inner side of the first outer tube 32, and the positioning member 34 is used to limit and constrain the axial displacement of the rotary drilling drill bit 2, the second outer tube 35 is sleeved on the inner side of the first outer tube 32, and the two ends of the second outer tube 35 are respectively abutted against the joint 12 and the positioning member 34, the gas distribution assembly 36 is fixedly arranged between the second outer tube 35 and the inner sleeve, the gas distribution assembly 36 is sealedly connected to the inner sleeve, and a gas distribution channel is formed between the gas distribution assembly 36, the second outer sleeve, the piston 4 and the first outer sleeve for gas distribution, thereby pushing the piston 4 to move axially.

[0049] As one of the specific implementations, the front end of the first outer tube 32 is sleeved on the outside of the joint 12, and the first outer tube 32 and the joint 12 are connected by a thread, the rear end of the first outer tube 32 is sleeved on the outside of the drill sleeve 27, and the first outer tube 32 and the drill sleeve 27 are connected by a thread, the drill sleeve 27 is sleeved on the outside of the drill bit, and the drill sleeve 27 and the drill bit are connected by a spline transmission.

[0050] Specifically, a positioning groove is provided on the outer surface of the drill bit, the outer ring of the positioning member 34 is fixedly connected to the inner surface of the first outer tube 32, the inner ring of the positioning member 34 is used in conjunction with the positioning groove, the positioning groove is slidably connected to the positioning member 34, and the positioning member 34 abuts against the two end faces of the positioning groove to limit and constrain the axial displacement of the drill bit.

[0051] In the above structure, the structure of the gas distribution assembly 36 in the embodiment of the present invention may be a gas distribution structure in an impactor in the prior art, which is defined here.

[0052] As one specific implementation method, Figure 2As shown, the gas distribution assembly 36 in the embodiment of the present invention includes a gas distribution seat 361, an inner cylinder 363 and a gas channel 365, wherein the gas distribution seat 361 is fixedly sleeved on the outer side of the inner sleeve, a first chamber 362 is formed between the gas distribution seat 361 and the joint 12, and the first chamber 362 is used to communicate with the high-pressure air channel 121, the inner cylinder 363 is sleeved on the outer side of the front end of the gas distribution seat 361, the inner cylinder 363 is fixedly connected to the second outer tube 35, the piston 4 is slidably arranged in the inner cylinder 363, a second air chamber 42 is formed between the inner cylinder 363 and the second outer tube 35, the second air chamber 42 is used to communicate with the gas distribution channel, and the gas channel 365 is arranged in the gas distribution seat 361, and the first chamber 362 and the second chamber 364 are connected through the gas channel 365.

[0053] Furthermore, as one of the implementation modes, the outer surface of the grouting pipe 11 in the embodiment of the present invention is provided with a positioning step, and the positioning step is used to abut against the rear end face of the gas distribution seat 361, and the front end of the gas distribution seat 361 is used to abut against the inner cylinder 363, thereby completing the positioning of the gas distribution seat 361.

[0054] Furthermore, in order to prevent leakage of the gas in the first chamber 362 , a seal 28 is provided between the gas distribution seat 361 and the grouting pipe 11 , and between the grouting pipe 11 and the joint 12 in the embodiment of the present invention.

[0055] Furthermore, the gas distribution channel in the embodiment of the present invention includes an air hole 51, a first annular groove 52, a second annular groove 53, a third annular groove 54 and an exhaust channel 55, wherein the air hole 51 is arranged on the inner cylinder 363, the first annular groove 52 is arranged on the outer surface of the piston 4, the first annular groove 52 is recessed from the outer surface of the piston 4 toward the axial direction of the piston 4, the second annular groove 53 is arranged on the second outer tube 35, the second annular groove 53 is used to communicate with the second air chamber 42, the second annular groove 53 is recessed from the inner wall of the second outer tube 35 in a direction away from the axis, the third annular groove 54 is arranged on the inner cylinder 363, the third annular groove 54 is used to connect the first annular groove 52 with the first air chamber 41, the third annular groove 54 is recessed from the inner wall of the inner cylinder 363 in a direction away from the axis, and an exhaust channel 55 is formed between the inner wall of the piston 4 and the inner sleeve, and the outlet of the exhaust channel 55 is used to communicate with the exhaust pipe 24.

[0056] Furthermore, the high-pressure air passage 121 in the embodiment of the present invention is communicated with the second air chamber 42, and the second chamber 364 is communicated with the second air chamber 42 through the air hole 51, the first annular groove 52, and the second annular groove 53. The first annular groove 52 is isolated from the third annular groove 54, thereby pushing the piston 4 to move toward the joint 12. At this time, the piston and the valve seat are in a separated state, and the first air chamber 41 enters the exhaust channel 55 through the gap between the piston and the valve seat. The exhaust gas in the first air chamber 41 is communicated with the exhaust pipe 24 through the exhaust channel 55, and the excess gas in the first air chamber 41 is discharged through the exhaust channel 55 and the exhaust pipe 24. When the high-pressure air passage 121 in the embodiment of the present invention is connected to the first air chamber 41, the second chamber 364 is connected to the first air chamber 41 through the air hole 51, the first annular groove 52 and the third annular groove 54. As the piston moves upward, the piston cooperates with the valve seat to isolate the first air chamber 41 from the exhaust passage 55. The outer surface of the piston cooperates with the inner surface of the second outer tube, so that the first annular groove 52 is isolated from the second annular groove 53. At this time, the piston is separated from the bushing 8, and the second air chamber 42 is connected to the exhaust pipe 24 through the exhaust passage 55, and the excess exhaust gas in the second air chamber 42 is discharged through the exhaust pipe 24. The piston 4 moves in the axial direction of the inner cylinder 363, thereby switching the above two states.

[0057] In the above structure, as one of the implementation modes, the rotary drilling drill bit 2 in the embodiment of the present invention includes a drill bit tail shank 26, a seal 28 and an impact drill bit 29, wherein the drill bit tail shank 26 is slidably arranged between the outer sleeve and the inner sleeve, the seal 28 is arranged between the drill bit tail shank 26 and the outer sleeve, and between the drill bit tail shank 26 and the inner sleeve, the impact drill bit 29 is arranged on the outside of the outer sleeve, and the impact drill bit 29 is fixedly connected to the drill bit tail shank 26.

[0058] Specifically, the drill shank 26 in the embodiment of the present invention is coaxially arranged with the piston 4, the drill shank 26 and the drill sleeve 27 are connected by a spline transmission, the drill sleeve 27 and the first outer tube 32 are connected by a thread, the first seal is arranged between the outer surface of the drill sleeve 27 and the inner wall of the first outer tube 32, and the second seal is arranged between the inner wall of the drill shank 26 and the outer surface of the inner casing.

[0059] Furthermore, as one implementation mode, the rotary drilling bit 2 in the embodiment of the present invention further includes a bushing 8 , which is fixedly sleeved on the inner side of the second outer tube 35 .

[0060] Furthermore, a receiving chamber is provided in the impact drill bit 29, and the receiving chamber is used to communicate with the grouting channel 111. A spraying assembly 22 is provided at the front end of the impact drill bit 29, and the spraying assembly 22 is used to inject concrete 7 into the drill hole when the drill is lifted.

[0061] Furthermore, the impact drill bit 29 in the embodiment of the present invention is fixedly connected to the drill bit shank 26. Specifically, the impact drill bit 29 and the drill bit shank 26 can be connected by welding.

[0062] The impact drill bit 29 in the embodiment of the present application has the same external structure as the impact drill bit 29 in the existing long spiral drilling tool. The difference from the existing structure is that an exhaust pipe 24 is provided inside the impact drill bit 29, and the drill bit tail handle 26 has the same external structure as the tail handle in the existing down-the-hole impactor. The difference from the existing structure is that a channel connected to the exhaust pipe 24 is provided between the drill bit tail handle 26 and the grouting pipe.

[0063] In the above structure, the exhaust channel in the embodiment of the present invention is arranged between the drill tail shank 26, the piston 4 and the grouting pipe 11. The drill tail shank 26 and the piston 4 are coaxially arranged. An annular air groove is arranged in the drill tail shank 26. The annular air groove is connected to the exhaust channel 55. The annular air groove is recessed from the inner surface of the drill tail shank 26 in the direction away from the axis. The rear end of the exhaust pipe 24 is arranged in the drill tail shank 26, and the exhaust pipe 24 is connected to the exhaust air duct 55.

[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A long spiral drilling tool, characterized in that: include: An inner casing, wherein a grouting channel (111) and a high-pressure air channel (121) which are independent of each other are arranged inside the inner casing, and the high-pressure air channel (121) is arranged outside the grouting channel (111); A rotary drilling bit (2) movably sleeved on the front end of the inner casing, a cutting tooth (21) being arranged in the circumferential direction of the front end of the rotary drilling bit (2), and a grouting assembly (22) being arranged at the front end of the rotary drilling bit (2); An outer sleeve sleeved on the outside of the inner sleeve and drivingly connected to the rotary drilling bit (2), wherein the outer sleeve and the outer circumferential surface of the rotary drilling bit (2) are provided with spiral blades (31) for slag removal; a piston (4) movably arranged between the inner sleeve and the outer sleeve, a first air chamber (41) being formed between the outer sleeve, the piston (4) and the inner sleeve, and a second air chamber (42) being formed between the piston (4), the rotary drill bit (2), the outer sleeve and the inner sleeve; An air distribution channel connected to the high-pressure air channel (121), the air distribution channel alternately connected to the first air chamber (41) and the second air chamber (42), driving the piston (4) to reciprocate along the axial direction of the inner casing, so as to provide a pulse force for the rotary drilling bit (2).

2. The long spiral drilling tool according to claim 1, characterized in that: Also includes: An exhaust port provided on the rotary drilling drill bit (2); An exhaust pipe (24) disposed in the rotary drill bit (2), the exhaust pipe (24) being alternately connected to the second air chamber (42) and the first air chamber (41); A one-way gas valve (25) is arranged at the end of the exhaust pipe (24), and the one-way gas valve (25) is used in conjunction with the exhaust port to allow gas to be discharged from the exhaust pipe (24) from the exhaust port in a one-way manner.

3. The long spiral drilling tool according to claim 2, characterized in that: The inner sleeve comprises: Grouting pipe (11); A joint (12) sleeved on the outside of the rear end of the grouting pipe (11) and sealedly connected to the grouting pipe (11), the grouting channel (111) penetrating the axial direction of the joint (12) and the grouting pipe (11), and the high-pressure air channel (121) being arranged at the front end of the joint (12); A check valve assembly (13) is disposed in the joint (12) and is used to open and close the high-pressure air passage (121).

4. The long spiral drilling tool according to claim 3, characterized in that: The high-pressure airway (121) comprises: A first air channel (1211) provided at the rear end of the connector (12); A second air channel (1212) is arranged at the front end of the joint (12), the outlet of the second air channel (1212) being in communication with the air distribution channel; a third air channel (1213) for connecting the first air channel (1211) and the second air channel (1212), the outlet of the third air channel (1213) extending to the outer surface of the connector (12), and a plug (1214) being provided at the outlet of the third air channel (1213); The check valve assembly (13) is arranged at the connection between the first air channel (1211) and the third air channel (1213), and is used to open and close the first air channel (1211).

5. The long spiral drilling tool according to claim 4, characterized in that: The check valve assembly (13) comprises: A valve stem (131), wherein a conical molding surface (132) for opening and closing the first air passage (1211) is provided at a rear end of the valve stem (131); An elastic member (133) connected to the valve stem (131), the elastic member (133) having a compressed state and a reset state, when the elastic member (133) is in the compressed state, the first air channel (1211) is connected to the third air channel (1213), when the elastic member (133) is in the reset state, the first air channel (1211) is isolated from the third air channel (1213).

6. The long spiral drilling tool according to any one of claims 2 to 5, characterized in that: The outer sleeve comprises: A first outer tube (32), the front end of the first outer tube (32) being drivingly connected to the rotary drill bit (2); A positioning member (34) fixedly arranged in the first outer tube (32) and used for limiting and restraining the axial displacement of the rotary drilling bit (2); a second outer tube (35) sleeved inside the first outer tube (32), wherein two ends of the second outer tube (35) are respectively in contact with the joint (12) and the positioning member (34); A gas distribution component (36) is fixedly sleeved between the second outer tube (35) and the inner sleeve, and the gas distribution component (36) and the inner sleeve are sealedly connected.

7. The long spiral drilling tool according to claim 6, characterized in that: The gas distribution assembly (36) comprises: A gas distribution seat (361) is fixedly sleeved on the outside of the inner sleeve, a first chamber (362) is formed between the gas distribution seat (361) and the joint (12), and the first chamber (362) is used to communicate with the high-pressure air passage (121); An inner cylinder (363) is sleeved on the outer side of the front end of the valve seat (361) and fixedly connected to the second outer tube (35); the piston (4) is slidably disposed in the inner cylinder (363); a second chamber (364) is formed between the inner cylinder (363) and the second outer tube (35); A gas passage (365) is disposed in the gas distribution seat (361) and is used to connect the first chamber (362) and the second chamber (364).

8. The long spiral drilling tool according to claim 7, characterized in that: The gas distribution channel comprises: an air hole (51) disposed on the inner cylinder (363) and communicating with the second chamber (364); A first annular groove (52) is provided on the piston (4), wherein the first annular groove (52) is recessed from the outer circumferential surface of the piston (4) toward the axial direction of the piston (4); a second annular groove (53) disposed on the second outer tube (35) and communicating with the second air chamber (42), wherein the second annular groove (53) is recessed from the inner wall of the second outer tube (35) in a direction away from the axis; A third annular groove (54) provided on the inner cylinder (363) and used for connecting the second annular groove (53) and the first air chamber (41), wherein the third annular groove (54) is recessed from the inner wall of the inner cylinder (363) in a direction away from the axis; An exhaust passage (55) is formed between the inner wall of the piston (4) and the inner sleeve, and an outlet of the exhaust passage (55) is in communication with the exhaust pipe (24).

9. The long spiral drilling tool according to claim 8, characterized in that: When the gas distribution channel is in communication with the second air chamber (42), the second chamber (364) is in communication with the second air chamber (42) through the first annular groove (52) and the second annular groove (53), and the first air chamber (41) is in communication with the exhaust pipe (24) through the exhaust channel (55); When the gas distribution channel is in communication with the first air chamber (41), the second chamber (364) is in communication with the first air chamber (41) through the first annular groove (52), the second annular groove (53) and the third annular groove (54), and the second air chamber (42) is in communication with the exhaust pipe (24) through the exhaust channel (55).

10. The long spiral drilling tool according to any one of claims 1 to 5 and 7 to 9, characterized in that: The rotary drilling bit (2) comprises: A drill bit tail shank (26) is arranged between the outer sleeve and the inner sleeve, and the drill bit tail shank (26) is connected to the outer sleeve via a drill clamping sleeve (27); A sealing member (28) provided between the drill bit shank (26) and the outer sleeve, and between the drill bit shank (26) and the inner sleeve; An impact drill bit (29) is arranged at the front end of the drill bit shank (26) and is fixedly connected to the drill bit shank (26).

Images