A ring bit with coring function and its drilling method

Abstract

A circumferential cutting hammer with core sampling function and its drilling method are disclosed. The circumferential cutting hammer includes a drilling device and a core sampling device. The drilling device includes a drilling cylinder with a core breaking mechanism and a core sampling device inside. After the pile hole drilling is completed, the core breaking mechanism on the drilling device can break the rock core, and the core sampling device can be used to retrieve the rock core. The rock core can be broken without the need for other tools or equipment, and the core sampling device can be used to clamp and retrieve the broken rock core. The entire pile hole can be constructed in one drilling operation, which simplifies the pile hole construction process, significantly shortens the construction time, ensures the construction efficiency of the pile hole, and improves the construction speed of the pile hole.

Description

Technical Field

[0001] This invention relates to the field of drilling device technology, specifically to a circumferential cutting hammer with core extraction function and its drilling method. Background Technology

[0002] Down-the-hole hammers are commonly used equipment in pile hole drilling construction. They are suitable for drilling in hard rock formations. When a conventional down-the-hole hammer is drilling, compressed air can enter the down-the-hole hammer through the drill rod to generate a certain frequency of impact force to break the rock. At the same time, the exhaust gas is used to cool the hammer head and discharge the chiseled rock cuttings out of the hole.

[0003] However, when the borehole diameter is large, a steel cylinder is usually used, with the down-the-hole hammer positioned around the circumference of the steel cylinder, also known as a circumferential cutting hammer, to complete the drilling work for larger diameter pile holes. This drilling method can only cut a circumferential groove according to the pile hole, forming a vertical columnar rock core inside the pile hole. The traditional method of core extraction is to use other devices or tools to break the rock core and set up a separate core sampling device to complete the core extraction operation. This results in a large number of drill bit replacement operations during drilling construction, prolonging the construction process of the pile hole and affecting the progress of the drilling work. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a circumferential cutting hammer with core sampling function and its drilling method.

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

[0006] A ring cutting hammer with core sampling function includes a drilling device and a core sampling device. The drilling device can complete the drilling work in the pile hole construction process, and the core sampling device can extract the rock core formed after the drilling work is completed, thus completing the pile hole drilling construction work.

[0007] Specifically, the drilling device includes a vertically arranged drilling cylinder with a connecting mechanism at the middle of its upper end and several down-the-hole hammers on its outer ring. The drilling cylinder can be connected to the drilling drive mechanism through the connecting mechanism and can complete the drilling work under the rotation of the down-the-hole hammers and its own rotation, and cut an annular groove at the pile hole construction position.

[0008] As a core technical concept of this invention, the drilling device further includes a top-breaking mechanism mounted on the drilling cylinder. The top-breaking mechanism includes a first hydraulic top-breaking cylinder mounted on the middle wall of the drilling cylinder, which can press against the top of the core inside the drilling cylinder after drilling is completed, allowing the core to break under the action of the first hydraulic top-breaking cylinder. The core-taking device includes a core-taking cylinder vertically mounted inside the drilling cylinder and located above the first hydraulic top-breaking cylinder. It can be vertically raised and lowered, and a core-taking mechanism is provided on the outer wall of the cylinder. A clamping opening is provided on the wall of the core-taking cylinder. The core-taking mechanism includes a clamping member rotatably mounted within the clamping opening. The inner end of the clamping member can rotate into the core barrel to clamp the rock core. The core-taking mechanism also includes a pull rod and a hydraulic core-taking cylinder set on the outer wall of the core barrel. The two ends of the pull rod are respectively connected to the telescopic end of the hydraulic core-taking cylinder and the outer end of the clamping member. The rotation of the clamping member can be controlled by the hydraulic core-taking cylinder to clamp the rock core. After the pile hole drilling work is completed, the rock core can be broken without the aid of other tools or other equipment. The core is then clamped and removed with the help of the core-taking device, making the pile hole construction process simpler and significantly improving the pile hole drilling speed.

[0009] As described above, in a preferred embodiment of a circumferential cutting hammer with core extraction function, the core breaking mechanism further includes a second hydraulic core breaking cylinder located on the lower wall of the drilling cylinder. The second hydraulic core breaking cylinder is located on the opposite side of the first hydraulic core breaking cylinder. When the first hydraulic core breaking cylinder is working, the second hydraulic core breaking cylinder can abut against the root of the core, making the core breaking operation smoother.

[0010] As a further preferred embodiment, the first hydraulic core breaking cylinder is a bidirectional telescopic hydraulic cylinder, with its telescopic ends pointing towards the axis of the drilling cylinder and the rock wall outside the drilling cylinder, respectively. The telescopic end pointing towards the axis of the drilling cylinder can press against and break the rock core, while the telescopic end pointing towards the rock wall outside the drilling cylinder can offset the reaction force generated when the rock core breaks, preventing the drilling cylinder from moving relative to the core breaking work, and further ensuring that the core breaking work can be carried out smoothly.

[0011] As described above, in a ring cutting hammer with core-taking function, the clamping component is a clamping plate whose rotation axis is perpendicular to the core-taking cylinder axis, and whose plane always coincides with the core-taking cylinder axis. This ensures that the clamping plate itself has good structural strength, thereby ensuring that it can have a better clamping effect on the rock core.

[0012] More specifically, the core-taking mechanism also includes a limiting seat set on the outer wall of the core-taking cylinder, on which a limiting component is slidably provided along the axis of the core-taking cylinder. The end of the pull rod away from the clamping plate and the telescopic end of the hydraulic core-taking cylinder are both connected to the limiting component, so that the hydraulic core-taking cylinder can be fixedly connected to the core-taking cylinder, making the connection more convenient. At the same time, after the clamping plate clamps the rock core, it can offset part of the reaction force provided by the pull rod to the hydraulic core-taking cylinder, thereby ensuring the clamping effect of the clamping plate.

[0013] Preferably, when the clamping plate clamps the core, the horizontal plane where it contacts the core is located is above the horizontal plane where its rotation axis is located. This allows the clamping plate to have a locking effect on the core. That is, after the clamping plate clamps the core, the core's own weight enables the clamping plate to provide better clamping force, further ensuring its clamping effect on the core.

[0014] As described above, a ring-cutting hammer with core-taking function includes a hammer head located at its lower end. The diameter of the circle formed by the inner side of the hammer head is smaller than the inner diameter of the core-taking cylinder, so that the core-taking cylinder can be smoothly inserted into the upper end of the rock core and complete the core clamping work.

[0015] Regarding the arrangement of the core sampling cylinder, the connecting mechanism includes a sliding column vertically disposed at the upper end of the drilling cylinder, a second connecting plate disposed at the upper end of the core sampling cylinder, and vertically slidably connected to the sliding column through the second connecting plate. The core sampling mechanism also includes a hydraulic drive cylinder disposed at the upper end of the drilling cylinder, which is connected to the second connecting plate and can control the lifting and lowering of the core sampling cylinder.

[0016] A drilling method, based on the aforementioned circumferential cutting hammer with coring function, specifically includes the following steps:

[0017] Step S1, Drilling

[0018] S1.1 Connect the drill barrel to the drilling drive mechanism via a connecting device;

[0019] S1.2 Start the drilling drive machinery and start drilling. Stop drilling when the drilling depth matches the distance from the first hydraulic jacking cylinder to the lower end of the drill barrel, that is, when the upper end of the core reaches the position of the first hydraulic jacking cylinder.

[0020] Step S2, Top Break

[0021] S2.1 Connect the oil circuit of the hydraulically driven machinery to the first hydraulic jacking cylinder and the hydraulic core-retrieving cylinder;

[0022] S2.2 The first hydraulic jacking cylinder is activated to jack the core, and after jacking, the telescopic end of the first hydraulic jacking cylinder returns to its original position;

[0023] Step S3, Core Removal

[0024] S3.1 The drill pipe moves upward, and the upward movement distance is 1 / 6 to 1 / 2 of the drilling depth of the drill pipe;

[0025] S3.2. The core tube is moved down until it is fitted onto the upper end of the core.

[0026] S3.3, The hydraulic core cylinder moves, which in turn drives the clamping parts to move through the pull rod, thus completing the core clamping work;

[0027] S3.4 The drill pipe moves down while the core tube moves up, and the downward speed of the drill pipe is the same as the upward speed of the core tube, so that the core tube and the rock core remain relatively stationary until the lower end of the drill pipe reaches the drilling depth position again.

[0028] S3.5 The drilling barrel moves upward, and then the core is extracted by the core sampling device.

[0029] In the aforementioned drilling method, after the drilling work of the drilling cylinder is completed, the construction of the pile hole can be completed simply by controlling the actions of the first hydraulic jacking cylinder, the second hydraulic jacking cylinder, the hydraulic core sampling cylinder, the hydraulic drive cylinder, and the up-and-down movement of the drilling cylinder. There is no need to take other measures to break or crush the rock core for extraction. The construction of the pile hole can be completed in one drilling operation, which significantly shortens the construction time and ensures the construction efficiency of the pile hole.

[0030] To further shorten the coring time and ensure that the coring tube can be smoothly inserted into the upper end of the core, in step S3, S3.1 and S3.2 start simultaneously, and when step S3.1 is completed, the lower end of the coring tube is exactly flush with the upper end of the core, or the lower end of the coring tube is above the upper end of the core.

[0031] The beneficial effects of this invention are as follows: This invention is a ring-cutting hammer with core-taking function and its drilling method. After the pile hole construction drilling work is completed, the core is broken off by the top-breaking mechanism on the drilling device. At the same time, the core is extracted by the core-taking device. The core can be broken off without the need for other tools or other equipment. The core is clamped and extracted by the core-taking device. The entire pile hole construction can be completed in one drilling operation, which simplifies the pile hole construction process, significantly shortens the construction time, ensures the construction efficiency of the pile hole, and improves the construction speed of the pile hole. Attached Figure Description

[0032] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] In the attached diagram:

[0034] Figure 1 This is a schematic diagram of the ring-cutting hammer in the embodiment;

[0035] Figure 2 This is a schematic diagram of the arrangement of the top-breaking mechanism in the embodiment;

[0036] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0037] Figure 4 for Figure 2 A magnified schematic diagram of the local structure at point B;

[0038] Figure 5 This is a schematic diagram showing the arrangement of the core sampling device in the embodiment;

[0039] Figure 6 This is a schematic diagram of the core sampling device in the embodiment;

[0040] Figure 7 This is a schematic diagram showing the arrangement of the core sampling mechanism in the embodiment;

[0041] Figure 8 This is a schematic diagram showing the state of the core clamping mechanism in the embodiment.

[0042] The components represented by the various reference numerals in the diagram are:

[0043] 1. Drilling device; 11. Drilling cylinder; 111. Upper cylinder; 112. Lower cylinder; 12. Connecting mechanism; 121. First connecting plate; 122. Connector; 13. Down-the-hole hammer; 131. Hammer head; 14. Top-cutting mechanism; 141. First hydraulic top-cutting cylinder; 142. Second hydraulic top-cutting cylinder; 2. Core sampling device; 21. Core cylinder; 22. Second connecting plate; 221. Sliding hole; 23. Core sampling mechanism; 231. Connecting seat; 232. Clamping plate; 233. Pin; 234. Tie rod; 235. Limiting seat; 236. Hydraulic core cylinder; 237. Connecting block; 3. Hydraulic pressure dividing device. Detailed Implementation

[0044] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. Example

[0045] This embodiment first provides a circumferential cutting hammer with core extraction function, see [link to previous section]. Figure 1 and Figure 5 It includes a drilling device 1 and a core sampling device 2. The drilling device 1 can complete the drilling work in the pile hole construction process, and the core sampling device 2 can extract the rock core formed after the drilling work is completed, and finally complete the pile hole drilling construction work. The following is a detailed description.

[0046] In this embodiment, the drilling device 1 includes a vertically arranged drilling cylinder 11 with a connecting mechanism 12 at the middle of its upper end and a plurality of down-the-hole hammers 13 on its outer ring. The drilling cylinder 11 can be connected to the drilling drive machinery (such as a rotary drilling rig) through the connecting mechanism 12, and can complete the drilling work under the rotation of the down-the-hole hammers 13 and its own rotation, and cut an annular groove at the pile hole construction position.

[0047] Specifically, regarding the structure of the drill pipe 11, in conjunction with... Figure 2 It includes an upper cylinder 111 and a lower cylinder 112 arranged vertically. Both cylinders are cylindrical structures, and the lower end of the upper cylinder 111 and the upper end of the lower cylinder 112 are fixedly connected by circumferentially arranged connecting bolts. This allows for easy replacement of the lower cylinder 112 when it is damaged after long-term use. At the same time, different specifications of the upper cylinder 111 can be replaced according to the depth of the pile hole, which improves the practicality and applicability of the drilling cylinder 11. In addition, both the upper cylinder 111 and the lower cylinder 112 are double-layer structures composed of inner and outer cylindrical cylinders to ensure the structural strength of the drilling cylinder 11.

[0048] The connecting mechanism 12 includes a first connecting plate 121 disposed at the upper end of the upper cylinder 111. A connector 122 is provided at the middle of the upper end of the first connecting plate 121. The connector 122 can be a square connector or a hexagonal connector. It can be connected to the drilling drive mechanism through the connector 122.

[0049] The down-the-hole hammer 13 is arranged along the axis of the drilling cylinder 11, and multiple hammers are arranged around the circumference of the drilling cylinder 11. It is connected to the cylinder wall of the drilling cylinder 11, and a hammer head 131 is provided at the lower end. The lower end of the hammer head 131 extends out of the lower end of the drilling cylinder 11. The specific structure of the down-the-hole hammer 13 can be referred to the single down-the-hole hammer 13 disclosed in the application document with application number CN201621048605.9. No further explanation or limitation will be made here. Driven by the drilling drive mechanism, an annular groove can be cut at the pile hole position, and a columnar rock core is formed in the middle of the annular groove to complete the drilling work of the drilling cylinder 11.

[0050] As one of the core technical concepts of this invention, combined with Figure 3 The drilling device 1 also includes a top-breaking mechanism 14 provided on the drilling tube 11. The top-breaking mechanism 14 includes a first hydraulic top-breaking cylinder 141 provided on the middle part of the cylinder wall of the drilling tube 11. It can press against the top of the rock core inside the drilling tube 11 after the drilling work is completed, so that the rock core can be broken under the action of the first hydraulic top-breaking cylinder 141.

[0051] Specifically, the circumferential cutting hammer (the aforementioned circumferential cutting hammer with core-taking function) further includes a hydraulic pressure-dividing device 3 disposed on the upper part of the first connecting plate 121. A first mounting port is provided in the middle of the upper cylinder 111. The first hydraulic top-cutting cylinder 141 is disposed in the first mounting port on the upper cylinder 111 and fixed between the inner and outer cylinders of the upper cylinder 111. The first hydraulic top-cutting cylinder 141 is connected to the hydraulic pressure-dividing device 3. The hydraulic pressure-dividing device 3 can be composed of several pressure-dividing boxes, through which the pressure-dividing boxes can control... The operation of the first hydraulic core breaking cylinder 141 is preferably controlled by a bidirectional telescopic hydraulic cylinder, with the telescopic ends pointing towards the axis of the drilling barrel 11 and the rock wall outside the drilling barrel 11, respectively. The telescopic end pointing towards the axis of the drilling barrel 11 can press against and break the rock core, while the telescopic end pointing towards the rock wall outside the drilling barrel 11 can offset the reaction force generated when the rock core is broken, preventing the drilling barrel 11 from moving relative to each other during the core breaking operation, thus further ensuring that the core breaking operation can be carried out smoothly.

[0052] As a further preferred option, combined with Figure 4 The core breaking mechanism 14 further includes a second hydraulic core breaking cylinder 142 disposed on the lower cylinder wall of the drilling cylinder 11. Specifically, the lower end of the lower cylinder 112 is provided with a second mounting port, the second hydraulic cylinder is disposed in the second mounting port and fixed between the inner and outer cylinders of the lower cylinder 112, and its telescopic end points to the axis of the drilling cylinder 11. The second hydraulic core breaking cylinder 142 is connected to a pressure distribution box, and the action of the second hydraulic core breaking cylinder 142 can be controlled through the pressure distribution box. At the same time, the second hydraulic core breaking cylinder 142 is disposed on the opposite side of the first hydraulic core breaking cylinder 141. When the first hydraulic core breaking cylinder 141 is working, the second hydraulic core breaking cylinder 142 can abut against the root of the rock core, so that the core breaking work can be more smoothly.

[0053] As another core technical concept of this invention, combined with Figure 6 The core sampling device 2 includes a core sampling cylinder 21 vertically installed inside the drilling cylinder 11 and located above the first hydraulic jacking cylinder 141. It can be vertically raised and lowered, and a core sampling mechanism 23 is provided on the outer cylinder wall. The core sampling mechanism 23 also includes a hydraulic core sampling cylinder 236 installed on the outer cylinder wall of the core sampling cylinder 21. It is connected to the core sampling mechanism 23 in a transmission manner. The hydraulic core sampling cylinder 236 is connected to a pressure distribution box. The pressure distribution box can control the movement of the first hydraulic jacking cylinder 141, thereby driving the core sampling mechanism 23 to move, and thus completing the core extraction work.

[0054] Specifically, combining Figure 7 and Figure 8The core sampling cylinder 21 is a cylindrical structure vertically mounted on the upper part of the upper cylinder 111, with its axis collinear with the axis of the drilling cylinder 11. A second connecting plate 22 is provided at its upper end. The connecting mechanism 12 includes a sliding column vertically mounted inside the upper part of the drilling cylinder 11. The upper end of the sliding column is connected to the lower end of the first connecting plate 121. A sliding hole 221 is provided in the middle of the second connecting plate 22, and the sliding column is vertically slidably connected to the second connecting plate 22 through the sliding hole 221. The core sampling mechanism 23 also includes a hydraulic drive cylinder located at the upper end of the drilling cylinder 11, connected to the second connecting plate 22. The hydraulic drive cylinder is connected to a pressure distribution box, which controls the movement of the hydraulic drive cylinder, thereby controlling the lifting and lowering of the core sampling cylinder 21.

[0055] Regarding the structure of the core sampling mechanism 23, the core sampling cylinder 21 has a clamping opening on its wall. The core sampling mechanism 23 includes a clamping member rotatably disposed within the clamping opening, and the inner end of the clamping member can rotate into the core sampling cylinder 21 to clamp the rock core. The core sampling mechanism 23 also includes a pull rod 234, the two ends of which are respectively connected to the telescopic end of the hydraulic core sampling cylinder 236 and the outer end of the clamping member. The rotation of the clamping member can be controlled by the hydraulic core sampling cylinder 236 to clamp the rock core. After the pile hole drilling work is completed, the rock core can be broken without the aid of other tools or other equipment, and the broken rock core can be clamped and removed with the help of the core sampling device 2. This makes the pile hole construction process simpler and significantly improves the pile hole drilling speed.

[0056] Specifically, the core sampling mechanism 23 includes a connecting seat 231 disposed on the outer wall of the core sampling cylinder 21. The connecting seat 231 is a two-piece structure and is located on both sides of the clamping opening. The clamping member is rotatably connected to the connecting seat 231 through a pin 233. The clamping member is a clamping plate 232, whose rotation axis is perpendicular to the axis of the core sampling cylinder 21, and whose plane always coincides with the axis of the core sampling cylinder 21. This ensures that the clamping plate 232 itself has good structural strength, thereby ensuring that it can have a better clamping effect on the rock core.

[0057] Preferably, the core extraction mechanism 23 further includes a limiting seat 235 disposed on the outer wall of the core extraction cylinder 21, which is located above the connecting seat 231 and is also a two-piece structure. A limiting element is slidably disposed on the limiting seat 235 along the axial direction of the core extraction cylinder 21. Specifically, the limiting seat 235 has a vertically opened sliding opening. The limiting element can be a pin 233, which passes through the sliding opening on the limiting seat 235. The end of the pull rod 234 away from the clamping plate 232 and the telescopic end of the hydraulic core extraction cylinder 236 are both connected to the pin 233 on the limiting seat 235, so that the hydraulic core extraction cylinder 236 can be fixedly connected to the core extraction cylinder 21, making the connection more convenient. At the same time, after the clamping plate 232 clamps the core, it can offset part of the reaction force provided by the pull rod 234 to the hydraulic core extraction cylinder 236, thereby ensuring the clamping effect of the clamping plate 232.

[0058] As a further preferred embodiment, the pull rod 234 includes two rods located on both sides of the clamping plate 232. The hydraulic core-taking cylinder 236 is connected to the pin 233 on the limiting seat 235 via the connecting block 237. The ends of the two pull rods 234 away from the clamping plate 232 are respectively attached to both sides of the connecting block 237, thereby ensuring that the hydraulic core-taking cylinder 236 can provide a better clamping force to the clamping plate 232 and ensure the clamping effect.

[0059] It is important to note that, in combination Figure 8 When the clamping plate 232 clamps the core, the horizontal plane where it contacts the core is located is above the horizontal plane where its rotation axis is located. This allows the clamping plate 232 to have a locking effect on the core. That is, after the clamping plate 232 clamps the core, the core's own weight enables the clamping plate 232 to provide better clamping force for the core, further ensuring its clamping effect on the core. At the same time, the down-the-hole hammer 13 includes a hammer head 131 located at its lower end. The diameter of the circle formed by the inner side of the hammer head 131 is smaller than the inner diameter of the core tube 21, so that the core tube 21 can be smoothly inserted into the upper end of the core and complete the core clamping work.

[0060] This embodiment also provides a drilling method. Based on the above-mentioned circumferential cutting hammer with core sampling function, the drilling method specifically includes the following steps:

[0061] Step S1, Drilling

[0062] S1.1 Connect the drill barrel 11 to the drilling drive mechanism via the connector 122 of the connecting device;

[0063] S1.2 Start the drilling drive machinery and carry out drilling work. Stop drilling when the drilling depth matches the distance from the first hydraulic top-cut cylinder 141 to the lower end of the drilling barrel 11, that is, when the upper end of the rock core reaches the position of the first hydraulic top-cut cylinder 141.

[0064] Step S2, Top Break

[0065] S2.1 Connect the oil circuit of the hydraulic drive mechanism to the pressure distribution box, and then drive the first hydraulic top-cut cylinder 141, the second hydraulic top-cut cylinder 142, the hydraulic drive cylinder and the hydraulic core-taking cylinder 236 through the pressure distribution box.

[0066] S2.2, the first hydraulic jacking cylinder 141 and the second hydraulic jacking cylinder 142 are activated to jack the core. After jacking, the extension and retraction ends of the first hydraulic jacking cylinder 141 and the second hydraulic jacking cylinder 142 return to their original positions.

[0067] Step S3, Core Removal

[0068] S3.1 The drilling tube 11 moves upward, and the core can be straightened by the hammer head 131 of the ring cutting hammer. The upward movement distance of the drilling tube 11 is 1 / 6 to 1 / 2 of the drilling depth of the drilling tube 11, ensuring that the core tube 21 can be smoothly fitted onto the upper end of the straightened core.

[0069] S3.2 The hydraulic drive cylinder moves, causing the core cylinder 21 to move down until it is fitted onto the upper end of the core.

[0070] S3.3, the hydraulic core cylinder 236 is activated, which in turn drives the clamping plate 232 to move through the pull rod 234, thus completing the core clamping work;

[0071] S3.4 The drilling drive mechanism drives the drilling barrel 11 to move downward, while the hydraulic drive cylinder drives the core barrel 21 to move upward. The downward speed of the drilling barrel 11 is the same as the upward speed of the core barrel 21, so that the core barrel 21 and the rock core remain relatively stationary until the lower end of the drilling barrel 11 reaches the drilling depth position again. This ensures that the rock core is completely inside the drilling barrel 11 when it is retrieved. The drilling barrel 11 can provide a good protection for the rock core and ensure the safety of construction personnel or construction machinery.

[0072] S3.5 The drilling drive mechanism drives the drilling barrel 11 to move upward, and then the core is extracted by the core sampling device 2.

[0073] In the above-described drilling method, after the drilling work of the drilling cylinder 11 is completed, the construction of the pile hole can be completed simply by controlling the actions of the first hydraulic jacking cylinder 141, the second hydraulic jacking cylinder 142, the hydraulic core sampling cylinder 236, the hydraulic drive cylinder, and the up-and-down movement of the drilling cylinder 11. There is no need to take other measures to break or crush the rock core for extraction. The construction of the pile hole can be completed in one drilling operation, which significantly shortens the construction time and ensures the construction efficiency of the pile hole.

[0074] To further shorten the core sampling time and ensure that the core sampling tube 21 can be smoothly inserted into the upper end of the core, in step S3, S3.1 and S3.2 start simultaneously, and when step S3.1 is completed, the lower end of the core sampling tube 21 is exactly flush with the upper end of the core, or the lower end of the core sampling tube 21 is located above the upper end of the core.

Claims

1. A ring-cut hammer with a coring function, characterized by, Includes drilling equipment (1) and core sampling equipment (2): The drilling device (1) includes a vertically arranged drilling cylinder (11), with a connecting mechanism (12) at the middle of its upper end and several down-the-hole hammers (13) on its outer ring. The drilling cylinder (11) can be connected to the drilling drive mechanism through the connecting mechanism (12) and can complete the drilling work under the rotation of the down-the-hole hammers (13) and its own rotation. The drilling device (1) also includes a top-breaking mechanism (14) provided on the drilling tube (11). The top-breaking mechanism (14) includes a first hydraulic top-breaking cylinder (141) provided on the middle wall of the drilling tube (11). After the drilling work is completed, the rock core inside the drilling tube (11) can be broken under the action of the first hydraulic top-breaking cylinder (141). The jacking mechanism (14) further includes a second hydraulic jacking cylinder (142) disposed on the lower cylinder wall of the drilling tube (11), the second hydraulic jacking cylinder (142) being disposed on the opposite side of the first hydraulic jacking cylinder (141); The core sampling device (2) includes a core sampling cylinder (21) vertically installed inside the drilling cylinder (11) and located above the first hydraulic top-cut cylinder (141). It can be vertically lifted and lowered, and a core sampling mechanism (23) is provided on the outer cylinder wall. A clamping opening is provided on the cylinder wall of the core sampling cylinder (21). The core sampling mechanism (23) includes a clamping member rotatably installed inside the clamping opening, and the inner end of the clamping member can rotate into the core sampling cylinder (21). The downhole hammer (13) includes a hammer head (131) located at its lower end. The diameter of the circle formed by the inner side of the hammer head (131) is smaller than the inner diameter of the core tube (21). The drilling tube (11) moves upward, and the core can be straightened by the hammer head (131) of the ring cutting hammer. The core sampling mechanism (23) also includes a pull rod (234) and a hydraulic core sampling cylinder (236) disposed on the outer wall of the core sampling cylinder (21). The two ends of the pull rod (234) are respectively connected to the telescopic end of the hydraulic core sampling cylinder (236) and the outer end of the clamping member, and the rotation of the clamping member can be controlled by the hydraulic core sampling cylinder (236) to complete the clamping and extraction of the broken rock core. The clamping component is a clamping plate (232), whose rotation axis is perpendicular to the axis of the core tube (21), and the plane on which it is located always coincides with the axis of the core tube (21). The core extraction mechanism (23) also includes a limiting seat (235) set on the outer wall of the core tube (21), on which a limiting component is slidably provided along the axis of the core tube (21). The end of the pull rod (234) away from the clamping plate (232) and the telescopic end of the hydraulic core extraction cylinder (236) are both connected to the limiting component. When the clamping plate (232) clamps the core, the horizontal plane where it contacts the core is located is above the horizontal plane where its rotation axis is located.

2. The ring bit according to claim 1, wherein The first hydraulic jacking cylinder (141) is a bidirectional telescopic hydraulic cylinder, and the telescopic ends point to the axis of the drilling tube (11) and the rock wall outside the drilling tube (11), respectively.

3. The ring hammer with coring function according to claim 1, characterized in that, The connecting mechanism (12) includes a sliding column vertically disposed at the upper end of the inside of the drilling cylinder (11), and the upper end of the core cylinder (21) is provided with a second connecting plate (22), which is vertically slidably connected to the sliding column through the second connecting plate (22). The core sampling mechanism (23) also includes a hydraulic drive cylinder located at the upper end of the drilling barrel (11), which is connected to the second connecting plate (22) and can control the lifting and lowering of the core sampling barrel (21).

4. A method of drilling, characterized by, A circumferential cutting hammer with core extraction function according to any one of claims 1-3 specifically includes the following steps: Step S1, Drilling S1.1 Connect the drill barrel (11) to the drilling drive mechanism via a connecting device; S1.2 Start the drilling drive mechanism to carry out drilling work until the drilling depth matches the distance from the first hydraulic jacking cylinder (141) to the lower end of the drilling barrel (11), then stop drilling; Step S2, Top Break S2.1 Connect the oil circuit of the hydraulic drive mechanism to the first hydraulic top-breaking cylinder (141) and the hydraulic core-taking cylinder (236); S2.2, The first hydraulic jacking cylinder (141) is activated to jack the core. After jacking, the telescopic end of the first hydraulic jacking cylinder (141) returns to its original position. Step S3, Core Removal S3.1 The drilling tube (11) moves upward, and the upward movement distance is 1 / 6-1 / 2 of the drilling depth of the drilling tube (11); S3.2, The core tube (21) is moved down until it is fitted onto the upper end of the core. S3.3, The hydraulic core cylinder (236) moves, which in turn drives the clamping parts to move through the pull rod (234) to complete the core clamping work; S3.4 The drilling barrel (11) moves down while the core barrel (21) moves up, and the downward movement speed of the drilling barrel (11) is the same as the upward movement speed of the core barrel (21) until the lower end of the drilling barrel (11) reaches the drilling depth position again. S3.5 The drilling tube (11) moves upward, and then the core is extracted by the core sampling device (2).

5. A method of drilling according to claim 4 wherein, In step S3, steps S3.1 and S3.2 start simultaneously, and when step S3.1 is completed, the lower end of the core tube (21) is exactly flush with the upper end of the core, or the lower end of the core tube (21) is above the upper end of the core.

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