Drilling system and drilling method for square pile hole construction

Abstract

A drilling system and a drilling method for square pile hole construction, the drilling system comprises a drill rod and a drilling device at the lower end thereof, a rotary drive mechanism of the drilling device is connected to the drill rod, and a rotary shaft of the rotary drive mechanism can drive the drilling mechanism to perform eccentric rotation and self-rotation, a main body cross section is arranged as a Lello triangle, a plurality of down-the-hole hammers are arranged thereon, and under the eccentric rotation and self-rotation of the main body, the drilling construction work of the square pile hole is completed by the down-the-hole hammers, the arrangement mode of the main body self-rotating and eccentrically rotating around the axis of the drill rod significantly improves the drilling efficiency of the square hole, and the down-the-hole hammers at the intersection of the three arc-shaped end faces of the main body effectively ensure the flatness of the wall of the square hole after the drilling is completed, the drilling construction of the square pile hole can be completed in one drilling, and no trimming or other operations are required, thereby further ensuring the drilling construction efficiency of the square pile hole.

Description

Technical Field

[0001] The invention relates to the technical field of drilling devices for pile hole construction, in particular to a drilling system for square pile hole construction and a drilling method thereof. Background Art

[0002] The drilling construction of pile holes is usually carried out with the help of a rotary drilling rig. When the drilling position is a harder rock layer, the drilling work will be completed with the help of a down-the-hole hammer. However, the existing rotary drilling rigs usually rely on the rotating action to complete the drilling of pile holes. When encountering the design requirements of a square pile, it is necessary to first carry out circular hole construction, and then use a special square trimming drill to trim the square pile. If a harder rock layer is encountered, the drilling efficiency will be abnormally slow, especially the trimming link, which has low efficiency, high energy consumption, and poor hole quality.

[0003] Based on this phenomenon, the application document with application number CN202223257556.8 discloses a square slot impactor, which sets the drilling cylinder into a square shape, and arranges multiple sub-down-the-hole hammers therein, and the multiple sub-down-the-hole hammers are also arranged in a rectangular array, and based on this structure, the drilling work of the square hole is completed. However, on the one hand, this design method only relies on the impact of the sub-down-the-hole hammer to complete the drilling of the square hole, and cannot cooperate with the rotation of the cylinder, so that the drilling efficiency is relatively low, especially when the drilling position is a harder rock formation, the drilling process is even slower, resulting in the drilling construction being unable to match the normal construction requirements; on the other hand, since the cylinder is vertically lowered during drilling, this will cause the part between the adjacent sub-down-the-hole hammer heads to be unable to effectively achieve drilling. At the same time, the above-mentioned square slot impactor, after the hole is formed, the side wall of the hole will still be convex due to the gap between the sub-down-the-hole hammers, that is, manual trimming is still required after the drilling is completed, so the drilling construction of its square pile hole still has great deficiencies. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a drilling system and a drilling method for square pile hole construction.

[0005] The technical solution of the present invention is as follows:

[0006] A drilling system for square pile hole construction comprises a rotary drilling rig, wherein the rotary drilling rig comprises a vertically arranged drill rod, a drilling device is arranged at the lower end of the drill rod, and the drilling work of the square pile hole can be completed by the drilling device.

[0007] As the core technical concept of the present invention, the drilling device includes a rotary drive mechanism and a drilling mechanism transmission-connected thereto.

[0008] As for the structure of the rotary drive mechanism, it includes a fixing part that can be horizontally fixed in the square pile hole, the fixing part can slide vertically along the square pile hole and has no relative rotation with the square pile hole, a circular first opening is vertically opened in the middle of the fixing part, the center of the first opening coincides with the axis of the drill pipe, and a connecting plate and a positioning plate are rotatably provided at the upper and lower ends, wherein a first connecting head is provided in the middle of the upper side of the connecting plate, and is connected to the lower end of the drill pipe through a first joint, the rotary drive mechanism also includes a vertically arranged rotary shaft, the rotary shaft passes through the positioning plate and the first opening, its axis does not coincide with the center of the first opening, and the upper end and the middle are respectively connected to the connecting plate and the positioning plate, the drill pipe can drive the first connecting head to rotate, thereby driving the connecting plate and the positioning plate to rotate, and finally driving the rotary shaft to rotate eccentrically around the axis of the drill pipe.

[0009] Based on the above structure, the rotating shaft is rotatably connected to the connecting plate and the positioning plate. The first opening is provided with internal teeth, and the part of the rotating shaft located in the first opening is provided with external teeth meshing with the internal teeth. When the rotating shaft rotates eccentrically with the connecting plate, it can rotate under the meshing action of the internal teeth and the external teeth.

[0010] As for the structure of the drilling mechanism, it includes a vertically arranged columnar main body, the cross-section of the main body is a Lello triangle structure, and at least the middle part of the main body and the intersection of the three arc-shaped end faces are vertically provided with a down-the-hole hammer, and the middle part of the upper end of the main body is also provided with a second joint, and is connected to the lower end of the rotating shaft through the second joint. The rotating shaft can drive the main body to rotate and eccentrically rotate around the axis of the drill pipe. Combined with the design that the main body cross-section is a Lello triangle, the main body can complete the drilling construction of square pile holes through the down-the-hole hammer. This setting method of the main body rotating and eccentrically rotating around the axis of the drill pipe significantly improves the drilling efficiency of the square hole. At the same time, the down-the-hole hammer at the intersection of the three arc-shaped end faces of the main body effectively ensures the flatness of the square hole wall after the drilling is completed. The drilling construction of the square pile hole can be completed in one drilling without trimming or other operations, which further ensures the drilling construction efficiency of the square pile hole.

[0011] As described above, a drilling system for square pile hole construction is provided with a first air vent at the connection position between the connecting plate and the rotating shaft; a first gas channel, a second gas channel and a third gas channel are respectively provided in the middle of the first connecting head, the rotating shaft and the second connecting head; a cover plate is buckled at the upper end of the main body, and a second chamber is formed between the cover plate and the upper end of the main body, the second connecting head is arranged at the middle part of the upper side of the cover plate, and a second air vent is provided at the connection position between the cover plate and the second connecting head; a fourth gas channel is provided in the middle of a plurality of down-the-hole hammers; the first gas channel, the first air vent, the second gas channel, the third gas channel, the second vent, the second chamber and the fourth gas channel are interconnected, and the high-pressure air injected through the first air vent can be transmitted to the down-the-hole hammer, thereby blowing out the debris generated by drilling to the outside of the hole, thereby assisting in completing the drilling construction work and further ensuring the drilling construction efficiency.

[0012] In order to ensure the service life of the rotary drive mechanism and prevent debris from damaging its structure due to the action of high-pressure gas, a protective tube is also provided on the lower side of the fixed part, a straightening plate is provided at the lower end of the protective tube, a second opening is opened in the middle of the straightening plate, the second connecting head passes through the second opening and is connected to the lower end of the rotary shaft, and the upper side of the cover plate is in contact with the straightening plate.

[0013] In order to further ensure the drilling efficiency of the drilling mechanism, down-the-hole hammers are also vertically provided on the three arc-shaped end faces of the main body.

[0014] At the same time, in order to ensure that the debris generated by drilling can be successfully blown out of the hole by high-pressure gas, the fixing part is configured to include a horizontally arranged fixing ring, whose outer diameter is smaller than the side length of the square hole, and the outer ring is provided with at least two relatively arranged clamping arms.

[0015] In the drilling system for square pile hole construction as described above, the second connector is plug-connected to the lower end of the rotary shaft and fixed by an axle pin, so that the connection between the drilling mechanism and the rotary shaft can be more convenient.

[0016] It should be noted that the shaft pin does not pass through the third gas channel to ensure the airtightness of the third gas channel.

[0017] A drilling system for square pile hole construction as described above, with regard to the setting method of the rotating shaft, a swivel interface is provided on the positioning plate, and the rotating shaft is rotatably arranged in the swivel interface through the third bearing ring; the rotating shaft on the upper side of the third bearing ring is provided with a first boss protruding outward and pressed on the upper side of the inner ring of the third bearing ring; the inner ring at the lower end of the swivel interface is provided with a second boss protruding inward and supported on the lower side of the outer ring of the third bearing ring, so that the connection between the rotating shaft and the connecting plate and the positioning plate can be more stable, and then the rotating shaft can smoothly rotate under the meshing action of the inner teeth and the outer teeth when it rotates eccentrically with the connecting plate.

[0018] To ensure the drilling system for square pile hole construction according to claim 8, it is characterized in that seals are provided between the upper end of the rotating shaft and the connecting plate, and between the second boss and the outer ring of the rotating shaft, wherein the seal between the upper end of the rotating shaft and the connecting plate can ensure the airtightness of the rotating connection position of the upper end of the rotating shaft, thereby ensuring that the gas reaching the down-the-hole hammer still has a relatively high pressure, and the seal between the second boss and the outer ring of the rotating shaft ensures that the dust generated by drilling will not enter between the two connecting plates, thereby ensuring that the structure inside the fixed ring is not contaminated, thereby increasing the service life.

[0019] The present invention also provides a drilling method, which is based on the above-mentioned square pile hole construction drilling system, the drilling system also includes a square columnar positioning cylinder, and the drilling method includes the steps of:

[0020] S1. Measurement and site selection

[0021] Determine the construction position of the square pile hole by measuring as needed;

[0022] S2, pile hole preset

[0023] A square pile hole is pre-drilled at the construction site manually, and the depth of the square pile hole to be drilled is not less than 30cm;

[0024] S3, Positioning and Fixing

[0025] Fix the positioning tube in the square pile hole to be drilled, and the part of the positioning tube outside the hole should not be greater than 4 / 5 of its total length;

[0026] S4, drilling

[0027] S4.1. Drive the rotary drilling rig to work, place the drilling device (2) into the positioning tube through the drill rod (13), and match the fixing part (211) with the fixing tube so that the fixing part (211) cannot rotate axially;

[0028] S4.2, the rotary drilling rig is in operation and drives the connecting plate (2121) to rotate through the first connecting head (213), thereby driving the rotary shaft (2124) to rotate eccentrically around the axis of the drill rod (13), and at the same time, the rotary shaft (2124) rotates under the meshing action of the internal teeth and the external teeth;

[0029] S4.3. Under the action of the second connector (225), the rotary shaft (2124) drives the main body (221) to rotate eccentrically and self-rotate, and completes the drilling of the square hole through the down-the-hole hammer (223).

[0030] The beneficial effects of the present invention are as follows: the present invention provides a drilling system and a drilling method for square pile hole construction, wherein the drilling mechanism of the drilling system is connected to the drill rod through a rotary drive mechanism, and the drill rod can drive the first connecting head to rotate, thereby driving the connecting plate and the positioning plate to rotate, and finally driving the rotary shaft to rotate eccentrically around the axis of the drill rod, and at the same time the rotary shaft can rotate on its own under the meshing action of the inner teeth and the outer teeth, thereby driving the main body to rotate eccentrically and on its own, and with the design that the main body cross-section is a Lello triangle, the main body can complete the drilling construction of the square pile hole through a down-the-hole hammer, and this setting mode of the main body rotating on its own and rotating eccentrically around the axis of the drill rod significantly improves the drilling efficiency of the square hole, and the down-the-hole hammer at the intersection of the three arc-shaped end faces of the main body effectively ensures the flatness of the wall of the square hole after the drilling is completed, and the drilling construction of the square pile hole can be completed in one drilling, without the need for trimming or other operations, thereby further ensuring the drilling construction efficiency of the square pile hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0032] In the attached picture:

[0033] Figure 1 It is a structural schematic diagram of a drilling system in an embodiment;

[0034] Figure 2 It is a structural schematic diagram of a drilling device in an embodiment;

[0035] Figure 3 It is a front view of the drilling device in the embodiment;

[0036] Figure 4 It is a structural schematic diagram of the rotary drive mechanism in the embodiment;

[0037] Figure 5 A schematic diagram of the transmission structure of the rotary drive mechanism in the embodiment;

[0038] Figure 6 It is a structural schematic diagram of the drilling mechanism in the embodiment;

[0039] Figure 7 A schematic diagram of a partial internal structure of a drilling mechanism in an embodiment;

[0040] Figure 8 A bottom view of the drilling mechanism in the embodiment;

[0041] The components represented by the reference numerals in the figure are:

[0042] 1. Frame; 11. Main frame; 12. Rotary drilling driver; 13. Drill rod; 2. Drilling device; 21. Rotary driving mechanism; 211. Fixing part; 2111. Fixing ring; 2112. Clamping arm; 212. Driving part; 2121. Connecting plate; 2122. Positioning plate; 2123. First bearing ring; 2124. Rotating shaft; 2125. Second bearing ring; 2126. Third bearing ring; 213. First connector; 214. Protective tube; 215. Straightening plate; 22. Drilling mechanism; 221. Main body; 222. Mounting tube; 223. Down-the-hole hammer; 2231. Hammer body; 2232. Hammer head; 224. Cover plate; 225. Second connector. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0044] Example

[0045] This embodiment first provides a drilling system for square pile hole construction. Figure 1-Figure 3 , including a rotary drilling rig, the rotary drilling rig includes a main body (not shown) and a frame 1 vertically arranged at the front / rear side thereof, a rotary drilling drive machine 12 is vertically slidably provided on the frame 1, a drill rod 13 is vertically provided at the lower side of the rotary drilling drive machine 12, and the rotary drilling drive machine 12 can drive the drill rod 13 to move vertically and drive the drill rod 13 to rotate, a drilling device 2 is provided at the lower end of the drill rod 13, the drilling device 2 includes a rotary driving mechanism 21 and a drilling mechanism 22 transmission-connected thereto, the rotary driving mechanism 21 can be connected to the lower end of the drill rod 13, and can drive the drilling mechanism 22 to move, and then the drilling work of the square pile hole is completed by the drilling device 2, and the structure of the drilling device 2 is described in detail below.

[0046] In this embodiment, combined with Figure 4 As one of the core technical concepts of the present invention, the rotary drive mechanism 21 includes a fixing portion 211 that can be horizontally fixed in the square pile hole, the fixing portion 211 can slide vertically along the square pile hole and has no relative rotation with the square pile hole, and a driving portion 212 is provided on the fixing portion 211, and the driving portion 212 can drive the drilling mechanism 22 to move.

[0047] Specifically, the fixing portion 211 is a horizontally arranged fixing ring 2111, in which a circular first opening is vertically opened, and the center of the first opening coincides with the axis of the drill rod 13. In order to prevent relative rotation between the fixing ring 2111 and the square pile hole, the outer ring of the fixing ring 2111 is provided with at least two relatively arranged clamping arms 2112, and the two relatively corner edges of the square pile hole can be supported by the two clamping arms 2112, so as to ensure that the fixing ring 2111 and the square pile hole do not rotate relative to each other, and at the same time, the vertical sliding of the fixing portion 211 along the square pile hole is not affected.

[0048] As a preferred embodiment, four clamping arms 2112 are evenly distributed around the outer circle of the fixing ring 2111 , and the outer ends of the four clamping arms 2112 can respectively press against the four corners of the square pile hole, further ensuring the fixing effect of the fixing part 211 .

[0049] As for the structure of the driving unit 212, Figure 5 , which includes a connecting plate 2121 and a positioning plate 2122 rotatably arranged at the upper and lower ends of the first opening, the connecting plate 2121 and the positioning plate 2122 are both circular plate structures, wherein the lower middle part of the connecting plate 2121 is provided with a columnar protrusion, the outer ring of the protrusion is provided with a first bearing ring 2123, and is rotatably connected to the inner side of the upper end of the first opening through the first bearing ring 2123, the upper middle part of the positioning plate 2122 is also provided with a columnar protrusion, and the outer ring of the protrusion is also provided with a first bearing ring 2123, and is rotatably connected to the inner side of the lower end of the first opening through the first bearing ring 2123, and at the same time, a connecting piece passing through the first opening is connected between the connecting plate 2121 and the positioning plate 2122, so as to ensure that the connecting plate 2121 and the positioning plate 2122 can rotate synchronously, and a first connecting head 213 is provided in the middle part of the upper side of the connecting plate 2121, the first connecting head 213 can be a hexagonal joint, and is connected to the lower end of the drill pipe 13 through the first joint.

[0050] On the basis of the above structure, the driving part 212 also includes a vertically arranged rotating shaft 2124, which passes through the positioning plate 2122 and the first opening, and its axis does not coincide with the center of the first opening, and the upper end and the middle part are respectively connected to the connecting plate 2121 and the positioning plate 2122. Through the drill rod 13, the first connecting head 213 can be driven to rotate, and then the connecting plate 2121 and the positioning plate 2122 can be driven to rotate, and finally the rotating shaft 2124 can be driven to rotate eccentrically around the axis of the drill rod 13.

[0051] In order to realize the self-rotation of the rotating shaft 2124 when it rotates eccentrically, the rotating shaft 2124 is rotatably connected with the connecting plate 2121 and the positioning plate 2122. The first opening is provided with internal teeth, and the part of the rotating shaft 2124 located in the first opening is provided with external teeth meshing with the internal teeth, so that when the rotating shaft 2124 rotates eccentrically with the connecting plate 2121, it can rotate under the meshing action of the internal teeth and the external teeth.

[0052] Specifically, the lower side of the connecting plate 2121 is provided with a circular adapter groove, the upper end of the rotating shaft 2124 is sleeved with a second bearing ring 2125, and the rotating shaft 2124 is rotatably arranged in the adapter groove through the second bearing ring 2125; the positioning plate 2122 is provided with an adapter, the rotating shaft 2124 passes through the adapter and is rotatably arranged in the adapter through the third bearing ring 2126, and at the same time, the rotating shaft 2124 on the upper side of the third bearing ring 2126 is 24 is provided with a first boss which protrudes outward and is pressed on the upper side of the inner ring of the third bearing ring 2126, and the inner ring at the lower end of the transfer interface is provided with a second boss which protrudes inward and is supported on the lower side of the outer ring of the third bearing ring 2126, so that the connection between the rotating shaft 2124 and the connecting plate 2121 and the positioning plate 2122 can be more stable, so that the rotating shaft 2124 can smoothly rotate under the meshing action of the inner teeth and the outer teeth when the connecting plate 2121 rotates eccentrically.

[0053] As for the structure of the drilling mechanism 22, Figure 6-Figure 8 , which comprises a vertically arranged columnar body 221, the cross section of the body 221 is a Lello triangle structure, and at least the middle part of the body 221 and the intersection of the three arc-shaped end faces are vertically provided with a down-the-hole hammer 223. In order to ensure the installation effect and stability of the down-the-hole hammer 223, a plurality of installation tubes 222 are vertically provided on the body 221, and the down-the-hole hammer 223 is installed in the installation tubes 222. A second connector 225 is also provided in the middle part of the upper end of the body 221, and the second connector 225 can also be a hexagonal connector, and the body 221 is connected to the lower end of the rotary shaft 2124 through the second connector, and the rotary shaft 2124 is connected to the lower end of the rotary shaft 2124 through the second connector. 4 can drive the main body 221 to rotate and eccentrically rotate around the axis of the drill rod 13. With the design that the cross section of the main body 221 is a Lello triangle, the main body 221 can complete the drilling construction of the square pile hole through the down-the-hole hammer 223. This setting mode of the main body 221 rotating and eccentrically rotating around the axis of the drill rod 13 significantly improves the drilling efficiency of the square hole. At the same time, the down-the-hole hammer 223 at the intersection of the three arc-shaped end faces of the main body 221 effectively ensures the flatness of the wall of the square hole after the drilling is completed. The drilling construction of the square pile hole can be completed in one drilling without trimming or other operations, which further ensures the drilling construction efficiency of the square pile hole.

[0054] In order to further ensure the drilling efficiency of the drilling mechanism 22, as a preferred embodiment, a down-the-hole hammer 223 is also vertically provided on the three arc-shaped end faces of the main body 221. At the same time, the down-the-hole hammer 223 includes a columnar hammer body 2231 and a hammer head 2232 located at its lower end. The lower end of the hammer head 2232 extends out of the lower end of the main body 221 to ensure that the drilling work can proceed smoothly.

[0055] At the same time, the second connector 225 is plug-connected to the lower end of the rotating shaft 2124 and fixed by an axle pin, so that the connection between the drilling mechanism 22 and the rotating shaft 2124 can be more convenient.

[0056] In this embodiment, a first air vent is provided at the connection position between the connecting plate 2121 and the rotating shaft 2124; a first gas channel, a second gas channel and a third gas channel are respectively provided in the middle of the first connecting head 213, the rotating shaft 2124 and the second connecting head 225; a cover plate 224 is buckled at the upper end of the main body 221, and a second chamber is formed between the cover plate 224 and the upper end of the main body 221, the second connecting head 225 is arranged in the middle of the upper side of the cover plate 224, and a second air vent is provided at the connection position between the cover plate 224 and the second connecting head 225; a fourth gas channel is provided in the middle of a plurality of down-the-hole hammers 223; the first gas channel, the first air vent, the second gas channel, the third gas channel, the second air vent, the second chamber and the fourth gas channel are connected, and the high-pressure air injected through the first air vent can be transmitted to the down-the-hole hammer 223, thereby blowing the debris generated by drilling out of the hole, assisting in completing the drilling construction work, and further ensuring the drilling construction efficiency.

[0057] In order to ensure that the debris generated by drilling can be blown out of the hole smoothly by the high-pressure gas, the outer diameter of the fixing ring 2111 is smaller than the side length of the square hole, so that there is a chip removal gap between the fixing part 211 and the square hole.

[0058] At the same time, in order to ensure the service life of the rotary drive mechanism 21 and prevent debris from damaging its structure due to the action of high-pressure gas, a protective tube 214 is also provided on the lower side of the fixed part 211, and a straightening plate 215 is provided at the lower end of the protective tube 214. A second opening is opened in the middle of the straightening plate 215, and the second connecting head 225 passes through the second opening and is connected to the lower end of the rotary shaft 2124, and the upper side of the cover plate 224 is in contact with the straightening plate 215.

[0059] It should be noted that the shaft pin does not pass through the third gas channel to ensure the airtightness of the third gas channel.

[0060] On the basis of the above structure, seals are provided between the upper end of the rotating shaft 2124 and the connecting plate 2121, and between the second boss and the outer ring of the rotating shaft 2124. The seal between the upper end of the rotating shaft 2124 and the connecting plate 2121 can ensure the airtightness of the rotating connection position of the upper end of the rotating shaft 2124, thereby ensuring that the gas reaching the down-the-hole hammer 223 still has a relatively high pressure. The seal between the second boss and the outer ring of the rotating shaft 2124 ensures that the dust generated by drilling will not enter between the two connecting plates 2121, thereby ensuring that the structure inside the fixed ring 2111 is not contaminated, thereby improving the service life.

[0061] This embodiment also provides a drilling method, which is based on the above-mentioned drilling system (a drilling system for square pile hole construction), the drilling system also includes a square columnar positioning cylinder, the internal specifications of the positioning cylinder are consistent with the specifications of the required square pile hole, and the drilling method specifically includes the steps of:

[0062] S1. Measurement and site selection

[0063] Determine the construction position of the square pile hole by measuring as needed;

[0064] S2, pile hole preset

[0065] A square pile hole is pre-drilled at the construction location manually, and the specifications of the square pile hole to be drilled are compatible with the specifications of the positioning tube. At the same time, the depth of the square pile hole to be drilled is not less than 30cm to ensure that the positioning tube can be firmly fixed;

[0066] S3, Positioning and Fixing

[0067] Fix the positioning tube in the square pile hole to be drilled, and the part of the positioning tube outside the hole should not be greater than 4 / 5 of its total length, so as to further ensure the stability of the positioning tube;

[0068] S4, drilling

[0069] S4.1. Drive the rotary drilling rig to work, place the drilling device 2 into the positioning tube through the drill rod 13, and match the fixing part 211 with the fixing tube to prevent it from axially rotating;

[0070] S4.2, the rotary drilling rig works and drives the connecting plate 2121 to rotate through the first connecting head 213, thereby driving the rotary shaft 2124 to rotate eccentrically around the axis of the drill rod 13, and at the same time, the rotary shaft 2124 rotates under the meshing action of the inner teeth and the outer teeth;

[0071] S4.3. The rotary shaft 2124 drives the main body 221 to rotate eccentrically and self-rotate under the action of the second connector 225, and completes the drilling of the square hole through a number of down-the-hole hammers 223. The waste generated by the drilling is discharged out of the hole under the action of high-pressure gas, ensuring that the drilling work can proceed smoothly.

Claims

1. A drilling system for square pile hole construction, characterized in that: The rotary drilling rig comprises a vertically arranged drill rod (13), a drilling device (2) is provided at the lower end of the drill rod (13), and the drilling device (2) can be used to complete the drilling of a square pile hole; The drilling device (2) comprises a rotary drive mechanism (21) and a drilling mechanism (22) connected thereto in a transmission manner; The rotary drive mechanism (21) comprises a fixing portion (211) capable of being fixed horizontally in a square pile hole, a first circular opening being vertically opened in the middle of the fixing portion (211), the center of the first opening being coincident with the axis of the drill rod (13), and a connecting plate (2121) and a positioning plate (2122) being rotatably provided at the upper and lower ends, respectively, wherein a first connector (213) is provided at the middle of the upper side of the connecting plate (2121), and is connected to the lower end of the drill rod (13) via a first joint, and the rotary drive mechanism (21) further comprises a vertically arranged rotary shaft (2124), the rotary shaft (2124) being arranged to pass through the positioning plate (2122) and the first opening, the axis of the rotary shaft being not coincident with the center of the first opening, and the upper end and the middle portion being respectively connected to the connecting plate (2121) and the positioning plate (2122); The rotary shaft (2124) is rotatably connected to the connecting plate (2121), and the rotary shaft (2124) is also rotatably connected to the positioning plate (2122); internal teeth are provided in the first opening, and the portion of the rotary shaft (2124) located in the first opening is provided with external teeth meshing with the internal teeth; The drilling mechanism (22) comprises a vertically arranged columnar main body (221), the cross section of the main body (221) being a Lello triangle structure, and a down-the-hole hammer (223) is vertically arranged at least in the middle of the main body (221) and at the junction of three arc-shaped end faces, and a second joint is also arranged in the middle of the upper end of the main body (221), and is connected to the lower end of the rotary shaft (2124) via the second joint.

2. A drilling system for square pile hole construction according to claim 1, characterized in that: A first vent is provided at the connection position between the connecting plate (2121) and the rotating shaft (2124); A first gas channel, a second gas channel and a third gas channel are respectively provided in the middle of the first connecting head (213), the rotating shaft (2124) and the second connecting head (225); The upper end of the main body (221) is buckled with a cover plate (224), and a second chamber is formed between the cover plate (224) and the upper end of the main body (221); the second connector (225) is disposed at the middle portion of the upper side of the cover plate (224), and a second vent is provided at the connection position between the cover plate (224) and the second connector (225); A fourth gas channel is provided in the middle of the plurality of down-the-hole hammers (223); The first gas channel, the first vent, the second gas channel, the third gas channel, the second vent, the second chamber and the fourth gas channel are connected.

3. A drilling system for square pile hole construction according to claim 2, characterized in that: A protective tube (214) is provided at the lower side of the fixing portion (211), a straightening plate (215) is provided at the lower end of the protective tube (214), a second opening is provided in the middle of the straightening plate (215), the second connector (225) passes through the second opening and is connected to the lower end of the rotary shaft (2124), and the upper side of the cover plate (224) is in contact with the straightening plate (215).

4. A drilling system for square pile hole construction according to claim 2, characterized in that: Down-the-hole hammers (223) are also vertically provided on the three arc-shaped end surfaces of the main body (221).

5. A drilling system for square pile hole construction according to claim 4, characterized in that: The fixing portion (211) comprises a horizontally arranged fixing ring (2111), the outer diameter of which is smaller than the side length of the square hole, and the outer ring is provided with at least two clamping arms (2112) arranged opposite to each other.

6. A drilling system for square pile hole construction according to claim 2, characterized in that: The second connector (225) is plug-connected to the lower end of the rotary shaft (2124) and fixed via a shaft pin.

7. A drilling system for square pile hole construction according to claim 6, characterized in that: The shaft pin does not pass through the third gas passage.

8. A drilling system for square pile hole construction according to claim 2, characterized in that: The positioning plate (2122) is provided with a transfer interface, and the rotary shaft (2124) is rotatably arranged in the transfer interface via a third bearing ring (2126); A first boss protruding outwards and pressed against the upper side of the inner ring of the third bearing ring (2126) is provided on the rotary shaft (2124) on the upper side of the third bearing ring (2126); The inner ring at the lower end of the transfer interface is provided with a second boss which protrudes inwards and is supported on the lower side of the outer ring of the third bearing ring (2126).

9. A drilling system for square pile hole construction according to claim 8, characterized in that: A sealing member is provided between the upper end of the rotary shaft (2124) and the connecting plate (2121), and between the second boss and the outer ring of the rotary shaft (2124).

10. A drilling method, characterized in that: A drilling system for square pile hole construction according to any one of claims 1 to 9, wherein the drilling system further comprises a square columnar positioning cylinder; The drilling method comprises the steps of: S1. Measurement and site selection Determine the construction position of the square pile hole by measuring as needed; S2, pile hole preset A square pile hole is pre-drilled at the construction site manually, and the depth of the square pile hole to be drilled is not less than 30cm; S3, Positioning and Fixing Fix the positioning tube in the square pile hole to be drilled, and the part of the positioning tube outside the hole should not be greater than 4 / 5 of its total length; S4, drilling S4.

1. Drive the rotary drilling rig to work, place the drilling device (2) into the positioning tube through the drill rod (13), and match the fixing part (211) with the fixing tube so that the fixing part (211) cannot rotate axially; S4.2, the rotary drilling rig is in operation and drives the connecting plate (2121) to rotate through the first connecting head (213), thereby driving the rotary shaft (2124) to rotate eccentrically around the axis of the drill rod (13), and at the same time, under the meshing action of the internal teeth and the external teeth, the rotary shaft (2124) rotates; S4.

3. Under the action of the second connector (225), the rotary shaft (2124) drives the main body (221) to rotate eccentrically and on its own, and completes the drilling of the square hole through the down-the-hole hammer (223).

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