Pipe jacking drilling device and method

Abstract

A pipe jacking drilling device and method include a pipe jacking drilling device, and the pipe jacking drilling device includes a driving mechanism, wherein the driving mechanism is connected to a plug-in coupling, a casing connector and a thrust drill bit arranged in sequence through a plurality of hollow drill rods; the plug-in coupling, casing connector and thrust drill bit are all provided with relatively arranged through holes along the arrangement direction; the plug-in coupling is plugged and fixed to the casing connector and can rotate synchronously; the casing connector is fixed to the thrust drill bit and can rotate synchronously; then the thrust casing is sleeved and fixed on the casing connector to achieve pipe jacking drilling. Through the above device, a new method is adopted for pipe jacking drilling, which not only can the casing connector and the related structures fixed thereto be directly discarded when necessary, and the necessary structures can be taken out instead, but also can avoid structural distortion and deformation caused by the synchronous rotation of the thrust casing, resulting in the inability to complete the drilling operation.

Description

Technical Field

[0001] The present invention relates to the technical field of mine drilling equipment, in particular to a pipe jacking drilling device and method. Background Art

[0002] The existing drilling equipment will inevitably encounter broken strata with collapsed rock during the construction of drilling holes for advanced exploration, water drainage, gas extraction, etc. in mines, and it is difficult to drill holes in broken rock strata, which will affect the drainage and gas extraction in the drilling operation. The existing solution is to set a special pipe body at the rear position of the propulsion drill bit. The pipe body can prevent the broken rock strata from blocking the drilling equipment and can assist in completing the drainage and gas extraction operations. However, most of the existing pipe bodies are structures that rotate synchronously with the propulsion drill bit. This means that the pipe body needs to overcome the pressure of the broken rock strata while bearing torque, and it is inevitable that the pipe body will twist and deform. Once the pipe body is twisted and deformed, the twisting and deformation phenomenon will continue to worsen with the rotation, and eventually the pipe body will be unable to perform its original function. In addition, due to the long length of the drilling operation, the process of removing and replacing the pipe body after deformation is extremely complicated, which will seriously affect the drilling progress. Summary of the Invention

[0003] In order to solve the problems in the above-mentioned pipe jacking drilling work that the pipe body is easily twisted and deformed and the replacement process is extremely complicated, the present invention provides a pipe jacking drilling device and method.

[0004] The technical solutions of the present invention are as follows:

[0005] A pipe jacking drilling device includes a driving mechanism, wherein the output shaft of the driving mechanism is connected to a plurality of hollow drill rods arranged in sequence, and the end of the hollow drill rod away from the driving mechanism is connected to a plug coupling, a casing connector and a propulsion drill bit in sequence;

[0006] The plug-in coupling, sleeve connector and propulsion drill bit are all provided with oppositely arranged through holes along the arrangement direction, and the through holes are located on the rotation axis;

[0007] The plug coupling is provided with a power shaft connecting section at one end away from the sleeve connector, and a sealing section and a plug-in limiting section are sequentially provided at one end of the plug coupling close to the sleeve connector, and the outer diameter of the power shaft connecting section is larger than the outer diameter of the plug-in limiting section, and the outer diameter of the plug-in limiting section is larger than the outer diameter of the sealing section;

[0008] One end of the casing connector close to the plug-in connector is a sleeve limiting section, the sleeve limiting section is plugged and fixed with the plug limiting section, and can rotate synchronously, the end of the casing connector close to the propulsion drill bit is a first fixing section, the inner diameter of the first fixing section is the same as the outer diameter of the sealing section, and the outer diameter of the casing limiting section is larger than the outer diameter of the first fixing section;

[0009] The end of the propulsion drill bit close to the casing connector is a second fixed section, the first fixed section of the casing connector is fixedly connected to the second fixed section of the propulsion drill bit, and the end of the propulsion drill bit away from the casing connector is a propulsion drill tooth;

[0010] A propulsion sleeve is rotatably sleeved on the first fixed section of the sleeve connector, the propulsion sleeve comprising a tube body and a vertical plate provided on one side of the tube body, the vertical plate being located between the propulsion drill bit and the sleeve connector, and the vertical plate being provided with a limiting hole, the diameter of the limiting hole being the same as the outer diameter of the first fixed section;

[0011] The sleeve connector is provided with an outwardly protruding movable limiting section between the sleeve limiting section and the first fixed section, and the outer diameter of the movable limiting section is the same as the inner diameter of the sleeve.

[0012] After the plug-in coupling is connected to several hollow drill rods, it can drive the mechanism to rotate synchronously. After it is plugged into the casing connector, it can drive the casing connector to rotate synchronously. At the same time, since it is not an existing fixed connection method, the plug-in structure can be separated at any time and has no effect on the waterproofing process. Therefore, after the device completes drilling, the related structure of the casing connector fixed connection can be directly discarded and left in the hole. At the same time, the device will not rotate synchronously when pushing the casing, so it will not be affected by the huge torque, and thus there will be no distortion or deformation problems.

[0013] To facilitate water and gas drainage, the first fixing section includes a secondary retaining section located near the plug-in coupling and an externally threaded section located near the propulsion drill bit. The secondary retaining section is the same length as the sealing section, and its inner diameter is larger than that of the externally threaded section. Once the sealing section is inserted, proper water drainage and gas extraction must be ensured.

[0014] Based on the above structure, the sealing section further comprises a first sealing section and a second sealing section. The first sealing section is positioned adjacent to the sleeve connector and has a smaller outer diameter than the second sealing section. The outer diameter of the second sealing section is the same as the inner diameter of the secondary limiting section. The outer wall of the first sealing section is provided with a groove, and a sealing ring is positioned within the groove. The maximum outer diameter of the sealing ring after being fitted into the first sealing section is greater than that of the second sealing section. The above sealing section must comprise two sections of different diameters to achieve sealing. Since the device is plug-and-lock fixed, it is necessary to ensure that sealing is achieved after plugging in and that sealing failure does not occur during rotation.

[0015] The specific connection method between the casing connector and the driving drill bit is that the second fixing section is provided with an internally threaded section arranged opposite the externally threaded section. The externally threaded section is truncated cone-shaped, and the outer diameter of the externally threaded section near the driving drill bit is smaller than the outer diameter of the end near the plug-in coupling. Conventional cylindrical thread structures are difficult to align, but a design with a large inlet and a small inner section effectively solves this problem.

[0016] In order to prevent the propulsion casing from bearing the propulsion pressure, the maximum outer diameter of the propulsion drill teeth is larger than the maximum outer diameter of the propulsion casing. During the propulsion process, the propulsion casing will only bear the resistance of the crushed rocks after the propulsion drill teeth break into holes, rather than the pressure of the rock formation.

[0017] The structure for achieving relative rotation between the propulsion sleeve and the sleeve connector is as follows: an upper bearing plate is sleeved on the outer side of the first fixed section, and the upper bearing plate is closely attached to the movable limiting section. A lower bearing plate is provided on the inner side of the propulsion sleeve near the vertical plate. The upper bearing plate and the lower bearing plate are arranged relative to each other to achieve a rotational connection between the propulsion sleeve and the sleeve connector. Since the propulsion sleeve does not need to rotate, it will only be subjected to pressure from the gravel in the hole after drilling, and will not be subjected to torque. Therefore, a relative rotation structure is not required. However, since the device is continuously advanced, the propulsion drill bit of this device must not be affected by the propulsion sleeve and unable to rotate.

[0018] Based on the above structure, further, the sum of the thickness of the vertical plate and the distance between the opposite planes of the upper and lower bearing plates is equal to the length of the secondary limit section. The forward and backward movement of the push sleeve must be avoided to prevent deformation during movement.

[0019] Preferably, the outer diameter of the power shaft connecting section is smaller than the inner diameter of the pipe body, and the length of the sleeve is greater than the plug-in length of the splice coupling and the sleeve connector. The splice coupling is protected by the sleeve from being affected by the broken rock formation.

[0020] In order to reduce liquid leakage, the external thread section is provided with a plurality of reflux holes along the length direction. The reflux holes include two connected straight holes, and the angle between the two straight holes is an acute angle. The openings of the two straight holes are respectively located on the inner wall of the external thread section and the vertical wall near the plug-in coupling.

[0021] Preferably, the sleeve limit section and the plug limit section are connected via a spline, so as to achieve synchronous rotation after plugging and be able to be separated at any time.

[0022] A pipe jacking drilling method adopts the above-mentioned pipe jacking drilling device and comprises the following steps:

[0023] Step 1: Place the bearing lower plate into the tube from the end of the push sleeve away from the vertical plate, and move the bearing lower plate until it contacts the vertical plate;

[0024] Step 2: Sleeve the upper bearing plate onto the first fixed section of the sleeve connector, and move the upper bearing plate to the movable limit section, then insert the sleeve connector from the end of the sleeve away from the vertical plate into the tube body until the upper bearing plate contacts the lower bearing plate;

[0025] Step 3: Connect the second fixing section of the propulsion drill bit to the first fixing section of the casing connector;

[0026] Step 4: Insert one end of the plug-in coupling sealing section into the sleeve limit section, and move it until the plug-in limit section and the movable limit section are in close contact;

[0027] Step 5: Connect the power shaft connecting section of the plug-in coupling to the hollow drill rod of the connecting drive mechanism;

[0028] Step 6: Adjust the push drill bit to a predetermined angle, start the driving mechanism, and drive the push drill bit to rotate and drill a hole;

[0029] Step 7: Pull out the hollow drill rod and the plug-in coupling of the connecting mechanism from the borehole, and discard the push drill bit, push casing and casing connector in the borehole.

[0030] Since the device adopts the method of synchronous rotation of the plug-in coupling and the casing connector, the plug-in coupling can be directly removed after use, and the casing connector and the connected parts can be directly discarded. In addition, the propulsion casing in the above structure will not be affected by the torque, so there will be no serious deformation accidents, which will lead to the inability to complete the drilling operation.

[0031] The beneficial effects of the present invention are: the present invention is a pipe jacking drilling device and method, which is different from the setting method of the propulsion casing in the existing device. The propulsion casing of this device can rotate relative to the casing connector and the relative position is constant, so it can advance synchronously with the propulsion drill bit, but will not rotate synchronously with it, nor will there be a problem of continuous rotation after distortion caused by large torque, which eventually leads to the inability of the device to operate. Moreover, in the above structure, while ensuring normal water drainage and gas extraction, the plug-in coupling can be plugged and fixed relative to the casing connector, and when necessary, the casing connector, propulsion casing and propulsion drill bit can be discarded and the necessary structure can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the detailed description of the preferred embodiment below, the solutions and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0033] In the attached figure:

[0034] Figure 1It is a schematic diagram of the cross-sectional structure of the present invention;

[0035] Figure 2 This is a schematic cross-sectional view of the propulsion drill bit of the present invention;

[0036] Figure 3 This is a schematic diagram of the cross-sectional structure of the propulsion casing of the present invention;

[0037] Figure 4 This is a schematic cross-sectional view of the sleeve connector of the present invention;

[0038] Figure 5 This is a schematic cross-sectional view of the plug-in coupling of the present invention;

[0039] Figure 6 This is a schematic diagram of the connection structure between the plug coupling and the sleeve connector of the present invention;

[0040] Figure 7 This is an exploded view of the structure of the present invention;

[0041] Figure 8 This is a structural schematic diagram of a second embodiment of the sleeve connector of the present invention;

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

[0043] 1. Plug-in coupling; 11. Power shaft connecting section; 12. Plug-in limiting section; 13. Sealing section; 131. First sealing section; 132. Second sealing section; 14. Sealing ring; 2. Casing connector; 21. Casing limiting section; 22. Movable limiting section; 23. First fixed section; 231. External thread section; 2311. Reverse flow hole; 232. Secondary limiting section; 3. Push casing; 31. Limiting hole; 32. Pipe body; 4. Push drill bit; 41. Second fixed section; 411. Internal thread section; 42. Push drill teeth; 5. Push bearing; 51. Bearing upper plate; 52. Bearing lower plate. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figure 1 A pipe jacking drilling device shown in the figure includes a driving mechanism, which is used to provide power to drive the rotation to complete the drilling operation, and the output shaft of the driving mechanism is connected to multiple hollow drill rods arranged in sequence, and the number of hollow drill rods set is determined by the actual drilling depth. Initially, only one hollow drill rod is set, but as the drilling depth increases, hollow drill rods are continuously added between the hollow drill rod and the driving mechanism for extension, and the hollow drill rod away from the driving mechanism is connected to a plug-in coupling 1, a casing connector 2 and a thrust drill bit 4 arranged in sequence, and the hollow drill rod is only connected to the plug-in coupling 1, and is not connected to the casing connector 2 and the thrust drill bit 4.

[0046] And, as Figure 1 、 7 As shown, the plug-in coupling 1, the sleeve connector 2 and the thrust drill bit 4 are all provided with relatively arranged through holes along the arrangement direction, and the through holes are located on the rotation axis for draining water and gas. The purpose of providing the through holes on the rotation axis is to enable them to remain in the same position during the rotation process, and there is no requirement for the connection direction between each component. It is only necessary to ensure that they are connected in sequence to be aligned.

[0047] like Figure 5 The specific structure of a plug-in coupling 1 shown is that a power shaft connecting section 11 is provided at one end of the plug-in coupling 1 away from the sleeve connector 2, and the power shaft connecting section 11 is used to connect the hollow drill rod, and the connection between the power shaft connecting section 11 and the hollow drill rod is a threaded connection, which can not only rotate synchronously but also move synchronously. The end of the power shaft connecting section 11 close to the sleeve connector 2 is successively composed of a plug-in limit section 12 and a sealing section 13. It is important that the outer diameter of the power shaft connecting section 11 is larger than the outer diameter of the plug-in limit section 12, and the outer diameter of the plug-in limit section 12 is larger than the outer diameter of the sealing section 13; that is, the plug-in coupling 1 is a structure with a gradually smaller diameter, so it is smoother and easier to use when placed in the drill hole, and it is also smoother when taken out.

[0048] And as Figure 4 The specific structure of the sleeve connector 2 shown is that the end of the sleeve connector 2 close to the plug-in connecting shaft is a sleeve limit section 21, and the sleeve limit section 21 is used to connect with the plug-in limit section 12, that is, the sleeve limit section 21 can be plugged and fixed with the plug-in limit section 12, and can rotate synchronously. The specific method is that the sleeve limit section 21 and the plug-in limit section 12 are connected by a spline. It can realize synchronous rotation after plugging in and can be separated at any time. Since it is necessary to rotate the drill bit 4 in the drilling process in this device, the casing connector 2 must be able to transmit the rotational power of the plug-in coupling 1. However, this device is different from the existing structure. If necessary, the casing connector 2 can be directly abandoned and discarded in the hole. Therefore, in addition to the need for synchronization of the forward drilling action, the process of retreating to remove the hollow drill rod and the plug-in coupling 1 does not need to be synchronized. The above-mentioned setting method is necessary to avoid the inconvenience of removing the pushing casing 3, which leads to the phenomenon that the entire hollow drill rod and the plug-in coupling 1 are discarded together.

[0049] In addition, the end of the casing connector 2 close to the thrust drill bit 4 is a first fixed section 23. The first fixed section 23 not only needs to be connected and fixed with the thrust drill bit 4, but also needs to be rotatably connected with the thrust casing 3 to limit it. At the same time, the inner diameter of the first fixed section 23 is the same as the outer diameter of the sealing section 13. In order to complete the drainage and gas extraction, a direct sealing connection between the sealing section 13 and the first fixed section 23 is necessary, but the above connection must ensure that it does not affect the connection between the casing connector 2 and the thrust drill bit 4.

[0050] Moreover, the inner diameter of the first fixing section 23 is smaller than the inner diameter of the sleeve limiting section 21, so there will be a vertical plane between the two end structures. When the plug-in limiting section 12 is inserted, it can be blocked by the vertical plane caused by the inner diameter difference and then plugged into place.

[0051] Furthermore, in the above structure, the key point is that Figure 4 As shown, the sealing segment 13 includes a first sealing segment 131 and a second sealing segment 132, that is, two segments with different outer diameters, so as to achieve the necessary sealing function of the present device, and the first sealing segment 131 is arranged close to the sleeve connector 2, and the outer diameter is smaller than the second sealing segment 132. If only the first sealing segment 131 is inserted, the sealing failure may occur. The outer diameter of the second sealing segment 132 is the same as the inner diameter of the secondary limiting segment 232. Although it can be inserted, a moving gap is still required. However, through the cooperation of the two ends, and as shown in FIG. Figure 5 As shown, a groove is provided on the outer wall of the first sealing section 131, and a sealing ring 14 is provided in the groove. This can be achieved through the above structure. Since the present device is plugged in and fixed, it is necessary to ensure that the sealing can be completed after plugging in, and that the sealing failure will not occur during the rotation process. It is difficult to achieve the above problem by relying solely on the sealing ring 14, nor by relying solely on the contoured design. However, through the above-mentioned segmented design, effective sealing can be achieved, and it is also very convenient to connect. It is only necessary to ensure that the sealing section 13 is inserted to the extreme position.

[0052] In order to complete the drilling operation, it is necessary to advance the setting of the drill bit 4, and as Figure 2 As shown, the end of the push drill bit 4 close to the casing connector 2 is a second fixed section 41, the inner diameter of the second fixed section 41 is the same as the outer diameter of the first fixed section 23, and can be fixed. After fixation, the driving mechanism rotates to drive the hollow drill rod to rotate, the hollow drill rod rotates to drive the plug-in coupling 1 to rotate, the plug-in coupling 1 drives the casing connector 1 to rotate, and the casing connector 2 drives the push drill bit 4 connected thereto to rotate, and after continuously pushing forward, the drilling operation can be achieved. For this reason, the end of the push drill bit 4 away from the casing connector 2 is a push drill tooth 42 for drilling.

[0053] Since this device adopts jacking drilling, the design of the thrust casing 3 is also very important. Figure 1 As shown, the installation position of the propulsion sleeve 3 is to set the propulsion sleeve 3 to be rotatably sleeved on the first fixing section 23 of the sleeve connector 2, located behind the propulsion drill bit 4, and as shown in FIG. Figure 3 The specific structure of the propulsion sleeve 3 shown is that the propulsion sleeve 3 includes a tube body 32 and a vertical plate arranged on one side of the tube body 32, wherein the vertical plate is located between the propulsion drill bit 4 and the casing connector 2, and the vertical plate is provided with a limiting hole 31, and the diameter of the limiting hole 31 is the same as the outer diameter of the first fixed section 23, which is used to connect with the casing connector 2. Using the above-mentioned socket connection method, during the rotation of the casing connector 2, the propulsion sleeve 3 will not rotate therewith, so there will be no distortion and deformation as shown in the existing structure, but non-rotation does not affect the normal use of the propulsion sleeve 3.

[0054] Moreover, since the casing connector 2 is continuously moving forward during the drilling process, the propulsion casing 3 cannot directly contact the casing connector 2, and the specific structure adopted is that the casing connector 2 is provided with an outwardly protruding movable limiting section 22 between the sleeve limiting section 21 and the first fixed section. The outer diameter of the movable limiting section 22 is the same as the inner diameter of the casing, which can support the propulsion casing 2, and the outer side of the first fixed section 23 is sleeved with a bearing upper plate 51, and the bearing upper plate 51 is tightly attached to the movable limiting section 22. A bearing lower plate 52 is provided on the inner side of the propulsion casing 3 near the vertical plate, and the bearing upper plate 51 is in contact with the bearing The lower plates 52 are arranged relative to each other and together form a propulsion bearing 5, which is used to realize the rotational connection between the propulsion sleeve 3 and the sleeve connector 2. Since the propulsion sleeve 3 does not need to rotate, it will only receive the pressure of the gravel in the hole after drilling, and will not receive torque. Therefore, there is no need to set a relative rotation structure. However, since the present device is continuously advanced, the propulsion drill bit 4 of the present device must not be affected by the propulsion sleeve 3 and cannot rotate. The split design of the propulsion bearing 5 can ensure that the propulsion sleeve 3 withstands the forward thrust, but the forward thrust does not become friction between the sleeve connector 2, and will not cause wear problems between the two.

[0055] like Figure 1 As shown, in order to prevent the propulsion casing 3 from being subjected to the propulsion pressure, the maximum outer diameter of the propulsion drill teeth 42 is larger than the maximum outer diameter of the propulsion casing 3. During the propulsion process, the propulsion casing 3 will only be subjected to the resistance of the crushed rocks after the propulsion drill teeth 42 break the hole, rather than the pressure of the broken rock formation.

[0056] In the above structure, the sum of the thickness of the vertical plate and the distance between the opposing planes of the upper bearing plate 51 and the lower bearing plate 52 is equal to the length of the secondary limiting section 232. The drill bit 4 and the casing connector 2 can be used to limit the position, thereby preventing the casing 3 from moving forward and backward and thus preventing deformation during movement.

[0057] Finally, the propulsion sleeve 3 can also have the function of protecting part of the structure, which is specifically reflected in that the outer diameter of the power shaft connecting section 11 is smaller than the inner diameter of the tube body 32, and the vertical plane where the end of the sleeve away from the vertical plate is located is located at the end of the plug coupling 1 away from the sleeve connector 2. Figure 1 As shown, the plug-in coupling 1 is protected by the sleeve and will not be affected by the broken rock layer, so it can rotate freely. The thrust sleeve 3 can block the broken rock layer at the periphery without affecting the internal structure.

[0058] On the basis of the above structure, further, Figure 1 、 7 As shown, the first fixing section 23 includes a secondary limiting section 232 located near the plug-in coupling 1 and an externally threaded section 231 located near the propulsion drill bit 4. The inner diameter of the secondary limiting section 232 is larger than that of the externally threaded section 231. When the sealing section 13 is inserted, it is blocked by the vertical plane formed by the inner diameter difference, thus reaching the limit position and being able to resist the advancement of the casing connector 2. The length of the secondary limiting section 232 is the same as that of the sealing section 13. This ensures that the sealing section 13 can properly drain water and extract gas after insertion.

[0059] Furthermore, the specific connection method between the casing connector 2 and the driving drill bit 4 is that the second fixing section 41 is provided with an internal threaded section 411 arranged opposite the external threaded section 231. The external threaded section 231 is truncated cone-shaped, and the outer diameter of the external threaded section 231 near the driving drill bit 4 is smaller than the outer diameter near the plug-in coupling 1. Conventional cylindrical threaded structures are difficult to align, but a structure with a large inlet and a small inner portion effectively solves this problem.

[0060] Through the above structure, it can be achieved that after the plug-in coupling 1 is connected to several hollow drill rods, the driving mechanism can drive the synchronous rotation, and after it is plugged into the casing connector 2, the casing connector 2 can be driven to achieve synchronous rotation. At the same time, since it is not an existing fixed connection method, the plug-in structure can be separated at any time and has no effect on the waterproofing process. Therefore, after the device completes drilling, the relevant structure of the casing connector 2 fixed connection can be directly discarded and left in the hole. At the same time, the device pushes the casing 3 and does not rotate synchronously, so it will not be affected by the huge torque, and thus there will be no problem of distortion and deformation.

[0061] Example 2

[0062] In addition to the above-mentioned structure, the following structure is also provided on the basis of the above-mentioned structure.

[0063] like Figure 8 As shown, to reduce liquid leakage, the externally threaded section 231 is circumferentially provided with a plurality of return holes 2311 along its length. The return holes 2311 comprise two interconnected straight holes, and the angle between the two straight holes is acute. The openings of the two straight holes are located on the inner wall of the externally threaded section 231 and on the vertical wall near the plug-in coupling 1, respectively. When liquid flows into the return holes 2311, it flows back. Moreover, the liquid flowing into the opening in the externally threaded section 231 can also block the liquid entering from the other opening, thereby further improving the sealing effect.

[0064] A pipe jacking drilling method used for the above-mentioned pipe jacking drilling device includes the following steps:

[0065] Step 1: Place the bearing lower plate 52 into the tube body 32 from the end of the propulsion sleeve 3 away from the vertical plate, and move the bearing lower plate 52 until it contacts the vertical plate;

[0066] Step 2: Sleeve the bearing upper plate 51 onto the first fixed section 23 of the sleeve connector 2, and move the bearing upper plate 51 until it contacts the movable limit section 22. Then, insert the sleeve connector 2 from the end of the sleeve 3 away from the vertical plate into the tube body 32 until the bearing upper plate 51 contacts the bearing lower plate 52.

[0067] Step 3: Connect the second fixing section 41 of the propulsion drill bit 4 to the first fixing section 23 of the casing connector 2;

[0068] Step 4: Insert one end of the sealing section 13 of the plug-in coupling 1 into the sleeve limiting section 21 and move it until the plug-in limiting section 12 and the movable limiting section 22 are in close contact;

[0069] Step 5: Connect the power shaft connecting section 11 of the plug-in coupling 1 to the hollow drill rod of the connecting drive mechanism;

[0070] Step 6: Adjust the push drill bit 4 to a predetermined angle, start the driving mechanism, and drive the push drill bit 4 to rotate and drill a hole;

[0071] Step 7: Pull out the hollow drill rod and the plug-in coupling of the connecting mechanism from the borehole, and discard the push drill bit, push casing and casing connector in the borehole.

[0072] Moreover, as the depth of the borehole increases, it is necessary to continuously add hollow drill rods to extend the depth of the borehole. Moreover, after the drilling operation is completed, the plug-in coupling 1 can be pulled out, and the push drill bit 4, push sleeve 3 and sleeve connector 2 can be directly discarded in the borehole to avoid the problem that all subsequent structures cannot be removed due to the inability to remove the above three structures. The accumulation of gravel in the borehole caused by the crushing of the rock strata can easily cause the push drill bit 4 and other design structures to be unable to be removed due to the pressure of the gravel when exiting the borehole. Once the push drill bit 4 cannot be removed, all structures connected to it will be difficult to remove them in the borehole. For this reason, directly discarding them and retaining the option of most structures can effectively reduce such problems.

[0073] That is to say, since the present device adopts the method of synchronous rotation of the plug-in coupling 1 and the sleeve connector 2, the plug-in coupling 1 can be directly removed after use, and the sleeve connector 2 and the connected parts can be directly discarded. Moreover, the propulsion sleeve 3 in the above structure will not be affected by the torque, so there will be no serious deformation accident, which will lead to the inability to complete the drilling operation.

Claims

1. A pipe jacking drilling device, comprising a driving mechanism, wherein the output shaft of the driving mechanism is connected to a plurality of hollow drill rods arranged in sequence, characterized in that: The end of the hollow drill rod is connected in sequence to a plug-in coupling (1), a casing connector (2) and a propulsion drill bit (4) on the side away from the driving mechanism; The plug-in coupling (1), the sleeve connector (2) and the thrust drill bit (4) are all provided with through holes arranged opposite to each other along the arrangement direction, and the through holes are located on the rotation axis; The end of the plug-in coupling (1) away from the sleeve connector (2) is provided with a power shaft connecting section (11), and the end of the plug-in coupling (1) close to the sleeve connector (2) is provided with a sealing section (13) and a plug-in limiting section (12) in sequence, and the outer diameter of the power shaft connecting section (11) is larger than the outer diameter of the plug-in limiting section (12), and the outer diameter of the plug-in limiting section (12) is larger than the outer diameter of the sealing section (13); The end of the sleeve connector (2) close to the plug-in connector shaft is a sleeve limiting section (21), the sleeve limiting section (21) is plugged and fixed with the plug-in limiting section (12), and can rotate synchronously, the end of the sleeve connector (2) close to the propulsion drill bit (4) is a first fixing section (23), the inner diameter of the first fixing section (23) is the same as the outer diameter of the sealing section (13), and the outer diameter of the sleeve limiting section (21) is larger than the outer diameter of the first fixing section (23); The end of the propulsion drill bit (4) close to the casing connector (2) is a second fixed section (41), the first fixed section (23) of the casing connector (2) is fixedly connected to the second fixed section (41) of the propulsion drill bit (4), and the end of the propulsion drill bit (4) away from the casing connector (2) is a propulsion drill tooth (42); A propulsion sleeve (3) is provided to be rotatably sleeved on the first fixed section (23) of the sleeve connector (2), the propulsion sleeve (3) comprising a tube body (32) and a vertical plate provided on one side of the tube body (32), the vertical plate being located between the propulsion drill bit (4) and the sleeve connector (2), and the vertical plate being provided with a limiting hole (31), and the diameter of the limiting hole (31) being the same as the outer diameter of the first fixed section (23); The sleeve connector (2) is provided with an outwardly protruding movable limiting section (22) between the sleeve limiting section (21) and the first fixed section (23); the outer diameter of the movable limiting section (22) is the same as the inner diameter of the sleeve; The outer side of the first fixed section (23) is sleeved with a bearing upper plate (51), and the bearing upper plate (51) is in close contact with the movable limiting section (22). The inner side of the propulsion sleeve (3) is provided with a bearing lower plate (52) near the vertical plate. The bearing upper plate (51) and the bearing lower plate (52) are arranged relative to each other to realize the rotational connection between the propulsion sleeve (3) and the sleeve connector (2).

2. A pipe jacking drilling device according to claim 1, characterized in that: The first fixing section (23) comprises a secondary limiting section (232) arranged near the plug-in coupling (1) and an external thread section (231) near the propulsion drill bit (4); the length of the secondary limiting section (232) is the same as the length of the sealing section (13); and the inner diameter of the secondary limiting section (232) is larger than the inner diameter of the external thread section (231).

3. A pipe jacking drilling device according to claim 2, characterized in that: The sealing section (13) comprises a first sealing section (131) and a second sealing section (132), wherein the first sealing section (131) is arranged close to the sleeve connector (2) and has an outer diameter smaller than that of the second sealing section (132), and the outer diameter of the second sealing section (132) is the same as the inner diameter of the secondary limiting section (232), and the outer wall of the first sealing section (131) is provided with a groove, and a sealing ring (14) is provided in the groove, and the maximum outer diameter of the sealing ring (14) after being sleeved on the first sealing section (131) is larger than that of the second sealing section (132).

4. The pipe jacking drilling device according to claim 2, characterized in that: The second fixing section (41) is provided with an internal thread section (411) arranged opposite to the external thread section (231), and the external thread section (231) is truncated cone-shaped, and the outer diameter of the external thread section (231) near the driving drill bit (4) is smaller than the outer diameter of the end near the plug-in coupling (1).

5. The pipe jacking drilling device according to claim 1, characterized in that: The maximum outer diameter of the propulsion drill tooth (42) is greater than the maximum outer diameter of the propulsion sleeve (3).

6. The pipe jacking drilling device according to claim 1, characterized in that: The sum of the thickness of the vertical plate and the spacing between the planes facing each other of the upper bearing plate (51) and the lower bearing plate (52) is equal to the length of the secondary limiting section (232).

7. The pipe jacking drilling device according to claim 1, characterized in that: The outer diameter of the power shaft connecting section (11) is smaller than the inner diameter of the tube body (32), and the sleeve length is greater than the plug-in length of the plug-in coupling (1) and the sleeve connector (2).

8. The pipe jacking drilling device according to claim 2, characterized in that: The external thread section (231) is provided with a plurality of return holes (2311) circumferentially along the length direction. The return holes (2311) include two connected straight holes, and the angle between the two straight holes is an acute angle. The openings of the two straight holes are respectively located on the inner wall of the external thread section (231) and on the vertical wall close to the plug-in coupling (1).

9. A pipe jacking drilling method, characterized in that: A pipe jacking drilling device according to any one of claims 1 to 8 is used, and comprises the following steps: Step 1: Place the bearing lower plate (52) into the tube body (32) from the end of the propulsion sleeve (3) away from the vertical plate, and move the bearing lower plate (52) until it contacts the vertical plate; Step 2: Sleeve the bearing upper plate (51) on the first fixed section (23) of the sleeve connector (2), and move the bearing upper plate (51) to contact the movable limit section (22), and then insert the end of the sleeve connector (2) self-propelled sleeve (3) away from the vertical plate into the tube body (32) until the bearing upper plate (51) contacts the bearing lower plate (52); Step 3: Connect the second fixing section (41) of the propulsion drill bit (4) to the first fixing section (23) of the casing connector (2); Step 4: insert one end of the sealing section (13) of the plug-in coupling (1) into the sleeve limiting section (21), and move it until the plug-in limiting section (12) and the movable limiting section (22) are in close contact; Step 5: Connect the power shaft connecting section (11) of the plug-in coupling (1) to the hollow drill rod of the connecting drive mechanism; Step 6: Adjust the propulsion drill bit (4) to a predetermined angle, start the driving mechanism, and drive the propulsion drill bit (4) to rotate and open a hole; Step 7: Pull out the hollow drill rod and the plug-in coupling (1) of the connecting mechanism from the borehole, and discard the push drill bit (4), the push casing (3) and the casing connector (2) in the borehole.

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