A detachable casing construction technology for drilling into a pile foundation in hard rock formation and its casing structure

Abstract

The invention discloses a detachable casing construction process for drilling pile foundations in hard rock formations and a casing structure thereof, and relates to the technical field of construction engineering, comprising a first casing and a second casing, wherein a positioning assembly is arranged on the outer surface of the first casing, and a connecting assembly is arranged on the outer surface of the second casing; in the process of drilling pile foundation construction, the invention first drives the second casing into a hole to ensure that the lower end of the casing contacts the foundation, and then moves one end of the positioning assembly to a position corresponding to the connecting assembly, so that the top views of the first connecting sleeve and the circular ring coincide, and at the same time, rotates a plurality of conical blocks to positions corresponding to a plurality of circular grooves, and continues to move the connecting sleeve downward so that the inclined block is stuck between the casing and the conical block, and fixes the plurality of conical blocks in the interior of the plurality of circular grooves respectively, thereby realizing the connection and sealing between the first casing and the second casing, and solving the problem in the prior art that the casing is inconvenient to disassemble and increases the difficulty of installing and removing the longer casing.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, in particular to a detachable casing construction process for drilling a pile foundation in a hard rock layer and a casing structure thereof. Background Art

[0002] When drilling into hard rock formations, landslides are likely to occur due to the looseness of the rocks or the fragility of the structure. Casings can help support the surrounding rocks to prevent them from falling or collapsing during the drilling process, thereby ensuring the safety of the construction. When drilling into hard rock formations, casings can prevent rocks from falling, ensure the stability of the borehole, and avoid accidents during the construction process.

[0003] In the prior art, during the construction of pile foundation drilling, casing is an important device for protecting the hole mouth, locating the pile position and maintaining the water head in the hole. It plays a vital role when drilling into the pile foundation of hard rock formation. In order to further improve the stability of the rock formation, it is necessary to use a longer casing to ensure the stability of the rock formation. The longer casing can better cover the unstable rock formation part of the upper part of the borehole. When drilling into the hard rock formation, the upper rock formation will have cracks and other unstable conditions under the influence of drilling vibration, etc., so it is necessary to use a longer casing. The long casing can effectively prevent the rock around the hole from collapsing. However, due to the large volume and long length of the long casing, it is inconvenient for the staff to install the long casing due to the long length of the casing. In addition, the space of some construction sites is limited. When installing the long casing, it will be restricted by the surrounding buildings, equipment and other construction elements, resulting in inconvenience in installation. The existing partially spliced ​​casings are connected by welding to connect multiple casings. Although the stability of the casing is improved, it is not convenient to disassemble, thereby increasing the difficulty of installing and removing the casing of the pile foundation for drilling in the hard rock formation.

[0004] Therefore, we propose a detachable casing construction process and casing structure for drilling pile foundation in hard rock formations to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a detachable casing structure for drilling pile foundations in hard rock formations, so as to solve the problem in the above background technology that the casing is inconvenient to disassemble and increases the difficulty of installing and removing longer casings.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a detachable casing structure for drilling pile foundation in hard rock formations, comprising a first casing and a second casing, a positioning assembly being arranged on the outer surface of the first casing, and a connecting assembly being arranged on the outer surface of the second casing, the positioning assembly comprising a first connecting sleeve, a plurality of threaded tubes being movably embedded in the inner wall of the first connecting sleeve, a plurality of driven gears being fixedly installed at one end of the plurality of threaded tubes, a plurality of sleeves being threadedly sleeved on the outer surfaces of the plurality of threaded tubes, a conical block being fixedly connected at the other end of the plurality of threaded tubes, a plurality of slots being arranged on the outer surfaces of the plurality of sleeves, a plurality of limiting tubes being movably embedded inside the interiors of the plurality of slots, a plurality of driving gears being meshedly connected on the outer surfaces of the plurality of driving gears, a plurality of limiting columns being fixedly connected on the outer surfaces of the first connecting sleeve, a second connecting sleeve being fixedly installed on the outer surface of the first connecting sleeve, an extension rod being movably embedded inside the interior of the second connecting sleeve, and a limiting plate being fixedly installed at one end of the extension rod.

[0007] Preferably, the inner wall of the first connecting sleeve is fixedly connected to the outer surface of the first casing, one end of the plurality of limiting tubes is movably passed through the outside of the plurality of slots, one end of the plurality of limiting tubes is movably passed through the outside of the first connecting sleeve, the outer surfaces of the plurality of limiting columns are rotatably connected to the inside of the plurality of limiting slots, the other end of the extension rod is fixedly connected to the outer surface of one of the driving gears, and the inner wall of the second connecting sleeve is fixedly connected to the outer surface of the first connecting sleeve.

[0008] Preferably, the connecting assembly includes a circular ring, the inner wall of the circular ring is fixedly connected to the outer surface of the second casing, the outer surface of the circular ring is provided with a plurality of circular grooves, the inner walls of the plurality of circular grooves are each provided with two auxiliary grooves, and the inner walls of the plurality of auxiliary grooves are each fixedly connected with a first damper.

[0009] Preferably, a first spring is disposed on the outer surface of each of the first dampers, and an inclined block is fixedly installed at one end of each of the first dampers. One end of each of the first springs is fixedly connected to the inner walls of each of the auxiliary grooves, and the other end of each of the first springs is fixedly connected to the outer surfaces of each of the inclined blocks.

[0010] Preferably, multiple circular holes are opened on the outer surfaces of the multiple inclined blocks, and limiting shafts are fixedly embedded between the relative inner walls of the multiple circular holes. Rollers are rotatably sleeved on the outer surfaces of the multiple limiting shafts, and the outer surfaces of the multiple rollers are movable and penetrate to the outside of the multiple circular holes.

[0011] Preferably, a limiting assembly is arranged on the outer surface of the limiting plate, and the limiting assembly includes two reinforcing blocks, the outer surfaces of the two reinforcing blocks are fixedly connected to the outer surface of the limiting plate, a damping shaft is arranged between the outer surfaces of the two limiting plates, and a torsion block is arranged on the outer surface of the damping shaft.

[0012] Preferably, grooves are provided on the opposite outer surfaces of the torsion block, an anti-compression block is fixedly installed on the outer surface of the second connecting sleeve, two screws are threadedly connected to the inner wall of the anti-compression block, a second damper is fixedly installed at one end of the two screws, and a second spring is arranged on the outer surface of the two second dampers.

[0013] Preferably, one end of each of the two second dampers is fixedly mounted with a positioning ball, one end of each of the two second springs is fixedly connected to one end of each of the two screw rods, and the other end of each of the two second dampers is fixedly connected to the outer surfaces of the two positioning balls.

[0014] Preferably, a mounting groove is formed at one end of the first protective tube, a sealing ring is arranged inside the mounting groove, and a connecting groove is formed at one end of the second protective tube.

[0015] A process for constructing a detachable casing for drilling into a pile foundation in a hard rock formation comprises the following steps:

[0016] S1. During the construction of pile foundation, casing is an important device to protect the hole mouth, locate the pile position and maintain the water head in the hole. When a longer casing needs to be installed,

[0017] Step 1: First, ensure the normal operation of the external crane and lifting equipment, and carry out necessary maintenance and inspection. Then, select appropriate lifting belts and hooks according to the weight and shape of the casing. According to the shape and weight of the casing, calculate the best lifting point position to ensure that the casing remains balanced during the lifting process. Connect the lifting belt firmly to the lifting point of the connecting component in the second casing to ensure that it is fixed reliably, and take anti-slip and anti-damage measures. Under the command of the crane operator, slowly raise the second casing to ensure that it remains vertical and stable at a certain height from the ground.

[0018] Step 2: During the lifting process, monitor the status of the casing, slowly lower the second casing to the predetermined position, ensure that it is aligned with the base, and use an external level to check the verticality and horizontality of the casing to ensure that it is correctly positioned;

[0019] S2, step 3: After the second casing is placed, gently place the second casing into the pre-drilled hole to ensure that the lower end of the casing is in contact with the foundation. When the second casing is implanted, use the external crane to move one end of the positioning assembly in the first casing to the position corresponding to the connecting assembly;

[0020] S3, step 4: when the top view of the first connecting sleeve and the circular ring overlap, the plurality of conical blocks are rotated to positions corresponding to the plurality of circular grooves, and then the first connecting sleeve is driven downward by the crane, so that the plurality of conical blocks are moved downward, so that the plurality of conical blocks are respectively inserted into the corresponding circular grooves, and the plurality of conical blocks are respectively fixed in the plurality of circular grooves, thereby achieving connection and sealing between the first casing and the second casing;

[0021] S4, step 5: when the casing needs to be moved out of the hard rock formation, first use an external crane to move the first casing to the ground through the sling and hook. When the positioning assembly and the connecting assembly are completely moved above the ground, rotate the limit plate to drive the casing to move downward so that the casing and the conical block form a whole. Then, the first casing can be moved upward by the external crane, thereby driving the casing upward, and then driving the conical block upward to the outside of the circular groove.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When in use, during the construction of the pile foundation, first drive the second casing into the hole to ensure that the lower end of the casing is in contact with the foundation, and then move one end of the positioning assembly to a position corresponding to the connecting assembly, so that the top view of the first connecting sleeve and the circular ring coincide, and at the same time, rotate the multiple conical blocks to positions corresponding to the multiple circular grooves, and continue to move the connecting sleeve downward so that the inclined block is stuck between the sleeve and the conical block, and fix the multiple conical blocks in the multiple circular grooves, thereby achieving the connection and sealing between the first casing and the second casing, solving the problem that the casing is inconvenient to disassemble in the prior art and increases the difficulty of installing and removing the longer casing;

[0024] 2. When in use, when separating the first casing and the second casing, in order to facilitate the rotation of the limit plate, first move the two screws to the outside of the anti-compression block to release the limit on the torsion block, and then rotate the torsion block upward. When the torsion block moves out of the anti-compression block, rotate the two screws again so that the two positioning balls move to the inside of the anti-compression block respectively. After the torsion block drives the sleeve to move to the specified position, rotate the torsion block to the inside of the anti-compression block again so that the two positioning balls are squeezed. The two positioning balls can be reset under the elastic action of the second spring and move to the inside of the two grooves respectively, further improving the convenience of casing connection;

[0025] 3. During use, when the multiple conical blocks move to the inside of the multiple circular grooves, the multiple rollers are set so that the conical blocks have a strong smoothing effect when they contact with the inclined blocks, which facilitates the movement efficiency of the conical blocks, thereby further improving the connection rate between the first casing and the second casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front perspective view of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0027] Figure 2 It is a three-dimensional view of the first casing part of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0028] Figure 3 This is a three-dimensional diagram of the structure of the sealing ring of a detachable casing structure for drilling into a pile foundation in a hard rock formation according to the present invention;

[0029] Figure 4 It is a three-dimensional view of the first connecting sleeve part of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0030] Figure 5 A three-dimensional view of a threaded pipe portion of a detachable casing structure for drilling into a pile foundation in a hard rock formation according to the present invention;

[0031] Figure 6 It is a partially cutaway perspective view of a threaded sleeve of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0032] Figure 7 It is a cross-sectional perspective view from another angle of the first connecting sleeve part of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0033] Figure 8 It is a partially cutaway perspective view of the second connecting sleeve of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0034] Fig. 9 A three-dimensional diagram of the torsion block portion of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0035] Fig.10 It is a cross-sectional stereoscopic diagram of the structure of the compression block part of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0036] Fig.11 A three-dimensional view of the second casing part of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0037] Fig.12 It is a cutaway perspective view of a circular ring portion of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention;

[0038] Fig.13 It is a partial three-dimensional view of the connection components of a detachable casing structure for drilling a pile foundation in a hard rock formation according to the present invention.

[0039] In the figure:

[0040] 1. First casing; 2. Mounting groove; 3. Sealing ring; 4. Positioning assembly; 401. First connecting sleeve; 402. Driven gear; 403. Threaded pipe; 404. Sleeve; 405. Conical block; 406. Slot; 407. Limiting pipe; 408. Driving gear; 409. Limiting column; 410. Limiting groove; 411. Second connecting sleeve; 412. Extension rod; 413. Limiting plate; 5. Limiting assembly; 501. Reinforcement block; 502 , damping shaft; 503, torsion block; 504, groove; 505, anti-pressure block; 506, screw; 507, second damper; 508, second spring; 509, positioning ball; 6, second casing; 7, connecting groove; 8, connecting assembly; 801, ring; 802, circular groove; 803, auxiliary groove; 804, first damper; 805, first spring; 806, inclined block; 807, circular hole; 808, limit shaft; 809, roller. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Reference Figure 1-13As shown: a detachable casing structure for drilling pile foundation in hard rock formation, including a first casing 1 and a second casing 6, a positioning assembly 4 is arranged on the outer surface of the first casing 1, a connecting assembly 8 is arranged on the outer surface of the second casing 6, the positioning assembly 4 includes a first connecting sleeve 401, a plurality of threaded tubes 403 are movably embedded in the inner wall of the first connecting sleeve 401, a driven gear 402 is fixedly installed at one end of the plurality of threaded tubes 403, a sleeve 404 is threadedly sleeved on the outer surface of the plurality of threaded tubes 403, a conical block 405 is fixedly connected to the other end of the plurality of threaded tubes 403, a slot 406 is opened on the outer surface of the plurality of sleeves 404, a limit tube 407 is movably embedded in the interior of the plurality of slots 406, and a plurality of The outer surfaces of the driven gears 402 are all meshed and connected with the driving gears 408, and the outer surfaces of the multiple driving gears 408 are all fixedly connected with the limiting columns 409. The outer surface of the first connecting sleeve 401 is provided with multiple limiting grooves 410, and the outer surface of the first connecting sleeve 401 is fixedly installed with the second connecting sleeve 411. The second connecting sleeve 411 is movably embedded with an extension rod 412 inside, and one end of the extension rod 412 is fixedly installed with a limiting plate 413. The inner wall of the first connecting sleeve 401 is fixedly connected to the outer surface of the first casing 1, and one end of the multiple limiting tubes 407 are respectively movably penetrated to the outside of the multiple slots 406, and one end of the multiple limiting tubes 407 are all movably penetrated to the outside of the first connecting sleeve 401. The outer surfaces of the plurality of limit columns 409 are respectively connected to the inner rotation of the plurality of limit grooves 410, the other end of the extension rod 412 is fixedly connected to the outer surface of one of the driving gears 408, the inner wall of the second connecting sleeve 411 is fixedly connected to the outer surface of the first connecting sleeve 401, the connecting assembly 8 includes a ring 801, the inner wall of the ring 801 is fixedly connected to the outer surface of the second casing 6, the outer surface of the ring 801 is provided with a plurality of circular grooves 802, the inner walls of the plurality of circular grooves 802 are each provided with two auxiliary grooves 803, the inner walls of the plurality of auxiliary grooves 803 are each fixedly connected to a first damper 804, the outer surfaces of the plurality of first dampers 804 are each provided with a first spring 805, the plurality of first dampers One end of 804 is fixedly installed with an inclined block 806, one end of multiple first springs 805 is fixedly connected to the inner wall of multiple auxiliary grooves 803, the other ends of multiple first springs 805 are fixedly connected to the outer surface of multiple inclined blocks 806, multiple circular holes 807 are opened on the outer surface of multiple inclined blocks 806, and limiting shafts 808 are fixedly embedded between the relative inner walls of multiple circular holes 807. The outer surfaces of multiple limiting shafts 808 are rotatably sleeved with rollers 809, and the outer surfaces of multiple rollers 809 are movable through the outside of multiple circular holes 807. One end of the first protective tube 1 is opened with a mounting groove 2, and a sealing ring 3 is arranged inside the mounting groove 2. One end of the second protective tube 6 is opened with a connecting groove 7.

[0043] In this embodiment, during the construction of the pile foundation, the lifting belt in the crane is firstly used to firmly connect to the lifting point of the connection component 8 in the second casing 6, and the second casing 6 is gently placed in the pre-drilled hole to ensure that the lower end of the casing is in contact with the foundation. After the second casing 6 is implanted, one end of the positioning component 4 in the first casing 1 is moved to a position corresponding to the connection component 8 by an external crane again, so that the top view of the first connecting sleeve 401 coincides with the top view of the ring 801, wherein the first connecting sleeve 401 has the same radius as the ring 801, and the plurality of conical blocks 405 are rotated to coincide with the plurality of conical blocks 405. The first connecting sleeve 401 is moved downward to the corresponding position of the circular groove 802, and then the crane is used to drive the first connecting sleeve 401 to move downward, so that the multiple conical blocks 405 move downward, so that the multiple conical blocks 405 are respectively inserted into the corresponding circular grooves 802. During the movement of the conical blocks 405, the two inclined blocks 806 in contact with them are squeezed, and then the first spring 805 matched with them is squeezed and shortened, thereby driving the inclined blocks 806 to move to the inside of the auxiliary grooves 803 matched with them, and then the conical blocks 405 move downward to the bottom of the two inclined blocks 806. Figure 6 As shown, there is a certain distance between the conical block 405 and the sleeve 404. When the conical block 405 moves downward to a position where it does not contact the two inclined blocks 806, since the outer diameter of the threaded tube 403 is smaller than the maximum outer diameter of the conical block 405, the two first springs 805 extend under their own elastic force, driving the two inclined blocks 806 to move toward the direction of the threaded tube 403, respectively, so that the two inclined blocks 806 are stuck between the sleeve 404 and the conical block 405, and then the multiple conical blocks 405 are respectively fixed inside the multiple circular grooves 802. At this time, the sealing ring 3 is just completely embedded in the connecting groove 7, thereby realizing the connection and sealing between the first casing 1 and the second casing 6. During the internal process, the multiple rollers 809 are arranged so that the conical block 405 has a strong smooth effect in the process of contacting with the inclined block 806, which facilitates the movement efficiency of the conical block 405. Through the connection between the first casing 1 and the second casing 6, the longer casing can be drilled into the hard rock formation in sections, and the connection is convenient. When the casing needs to be moved out of the hard rock formation, the first casing 1 is first moved to the ground by an external crane through the action of the sling and the hook. When the positioning component 4 and the connecting component 8 are completely moved above the ground, the rotating limit plate 413 drives the extension rod 412 to rotate, and then drives the driving gear 408 connected thereto to rotate, thereby driving the other multiple driven gears 402 and the driving gear 408 to rotate, wherein, as Figure 7As shown, the cross-sections of the limiting column 409 and the limiting groove 410 match each other and are both T-shaped, the purpose of which is to limit the limiting column 409 while facilitating its rotation. The rotation of the multiple driven gears 402 drives the multiple threaded tubes 403 to rotate, and then drives the multiple sleeves 404 to move downward, wherein the sleeves 404 are limited by the multiple limiting tubes 407, so that they can move up and down intelligently under the action of the threaded tubes 403. In addition, as Figure 6 As shown, the internal cross-section of the card slot 406 matches the cross-section size of the limiting tube 407, and both are T-shaped, the purpose of which is to limit the limiting tube 407 while facilitating its up and down movement. When the sleeve 404 moves to the position in contact with the inclined block 806, the inclined block 806 is squeezed again, so that the first spring 805 is shortened, driving the inclined block 806 to move to the inside of the auxiliary groove 803 again, and when the bottom of the sleeve 404 moves to the position in full contact with the top of the conical block 405, the sleeve 404 and the conical block 405 form a whole, wherein the radius of the top circle of the conical block 405 is the same as the outer diameter of the bottom of the sleeve 404, and the top of the sleeve 404 is still on the upper part of the inclined block 806, still The inclined block 806 is squeezed, and the first casing 1 can be continuously moved upward by the external crane, thereby driving the sleeve 404 to move upward, and then driving the tapered block 405 to move upward to the outside of the circular groove 802, thereby realizing the separation between the first connecting sleeve 401 and the circular ring 801. At the same time, the first casing 1 drives the sealing ring 3 to move upward during the upward movement, thereby moving it to the outside of the connecting groove 7, thereby realizing the separation between the first casing 1 and the second casing 6. The connection and separation of the casing are facilitated by the positioning component 4 and the connecting component 8, and the steps are relatively simple, which facilitates the connection and disassembly of longer casings, and solves the problem in the prior art that the casing is inconvenient to disassemble and increases the difficulty of installing and removing the longer casing.

[0044] like Figure 1 and Figure 8-10As shown, the outer surface of the limit plate 413 is provided with a limit assembly 5, and the limit assembly 5 includes two reinforcement blocks 501, and the outer surfaces of the two reinforcement blocks 501 are fixedly connected to the outer surface of the limit plate 413, and a damping shaft 502 is arranged between the outer surfaces of the two limit plates 413, and a torsion block 503 is arranged on the outer surface of the damping shaft 502, and grooves 504 are provided on the opposite outer surfaces of the torsion block 503, and an anti-compression block 505 is fixedly installed on the outer surface of the second connecting sleeve 411, and the inner wall of the anti-compression block 505 is threadedly connected to two screw rods 506, and the two screw rods 506 are connected to the outer surface of the second connecting sleeve 411. 06, a second damper 507 is fixedly installed at one end, a second spring 508 is arranged on the outer surface of the two second dampers 507, a positioning ball 509 is fixedly installed at one end of the two second dampers 507, one end of the two second springs 508 is fixedly connected to one end of the two screw rods 506 respectively, and the other end of the two second dampers 507 is fixedly connected to the outer surface of the two positioning balls 509 respectively, a mounting groove 2 is opened at one end of the first casing 1, a sealing ring 3 is arranged inside the mounting groove 2, and a connecting groove 7 is opened at one end of the second casing 6.

[0045] In this embodiment, when separating the first casing 1 and the second casing 6, in order to facilitate the rotation of the limit plate 413, the two screws 506 are first rotated to move them to the outside of the compression block 505 respectively, thereby driving the two positioning balls 509 to move to the outside of the groove 504 respectively until they are completely moved out of the groove 504, thereby releasing the limit on the torsion block 503, and then the torsion block 503 can be rotated upward to move it to a position perpendicular to the limit plate 413, and then the limit plate 413 can be rotated, wherein the damping shaft 502 limits the torsion block 503 to prevent it from rotating at will. The damping shaft 502 is a device for reducing movement or vibration in a mechanical system. Its main working principle is to absorb and attenuate the energy brought by the movement through specific damping materials and designs, thereby improving the stability of the equipment and reducing the impact of vibration on the system. When moving out of the interior of the anti-compression block 505, the two screw rods 506 are rotated again to move them toward the interior of the anti-compression block 505 respectively until the outer walls of the two screw rods 506 are completely in contact with the outer surface of the anti-compression block 505, so that the two positioning balls 509 are moved to the interior of the anti-compression block 505 respectively. After the twist block 503 drives the sleeve 404 to move to the specified position, the twist block 503 is rotated to the interior of the anti-compression block 505 again, so that the two positioning balls 509 are squeezed, driving the two second springs 508 to shorten. When the two grooves 504 are rotated to correspond to the positions of the two screw rods 506, the two positioning balls 509 can be reset under the elastic action of the second springs 508 and move to the interior of the two grooves 504 respectively, that is, the twist block 503 is limited to prevent it from moving in subsequent construction. Through the action of the limiting component 5, the convenience of casing connection is further improved.

[0046] In the present invention, during the construction of the pile foundation, the second casing 6 is gently placed in the pre-drilled hole to ensure that the lower end of the casing is in contact with the foundation. After the second casing 6 is implanted, one end of the positioning assembly 4 in the first casing 1 is moved to a position corresponding to the connecting assembly 8 by an external crane again, so that the top views of the first connecting sleeve 401 and the circular ring 801 coincide with each other, and at the same time, the plurality of conical blocks 405 are rotated to positions corresponding to the plurality of circular grooves 802, and the first connecting sleeve 401 is continuously driven to move downward, so that the plurality of conical blocks 405 are moved downward, so that the plurality of conical blocks 405 are respectively inserted into the corresponding circular grooves 802. During the movement of the conical blocks 405, the two inclined blocks 806 in contact with them are squeezed. Then, the first spring 805 matched therewith is squeezed and shortened, thereby driving the inclined blocks 806 to move to the inside of the auxiliary groove 803 matched therewith, and then the conical block 405 moves downward to the bottom of the two inclined blocks 806. When the conical block 405 moves downward to a position where it does not contact the two inclined blocks 806, since the outer diameter of the threaded tube 403 is smaller than the maximum outer diameter of the conical block 405, the two first springs 805 extend under their own elastic force, driving the two inclined blocks 806 to move toward the direction of the threaded tube 403, respectively, so that the two inclined blocks 806 are stuck between the sleeve 404 and the conical block 405, and then the multiple conical blocks 405 are fixed in the multiple circular grooves 802, respectively. At this time, the sealing ring 3 is completely embedded in The interior of the connecting groove 7 realizes the connection and sealing between the first casing 1 and the second casing 6. Through the connection between the first casing 1 and the second casing 6, the longer casing can be drilled into the hard rock formation in sections and is convenient to connect. When the casing needs to be moved out of the hard rock formation, the first casing 1 is first moved to the ground by an external crane through the action of the sling and the hook. When the positioning component 4 and the connecting component 8 are completely moved above the ground, the limit plate 413 is rotated to drive the extension rod 412 to rotate, and then drive the driving gear 408 connected thereto to rotate, thereby driving the other multiple driven gears 402 and the driving gear 408 to rotate, and the rotation of the multiple driven gears 402 drives the multiple threaded pipes 403 to rotate, and then drives the multiple casings 404 downward When the sleeve 404 moves to the position in contact with the inclined block 806, the inclined block 806 is squeezed again, so that the first spring 805 is shortened, and the inclined block 806 is driven to move to the inside of the auxiliary groove 803 again. When the bottom of the sleeve 404 moves to the position in full contact with the top of the conical block 405, the sleeve 404 and the conical block 405 form a whole, and the top of the sleeve 404 is still on the upper part of the inclined block 806, and the inclined block 806 is still squeezed. At this time, the first casing 1 can continue to be moved upward by the external crane, thereby driving the sleeve 404 to move upward, and then driving the conical block 405 to move upward to the outside of the circular groove 802, thereby realizing the separation between the first connecting sleeve 401 and the circular ring 801. At the same time,In the process of moving upward, the first casing 1 drives the sealing ring 3 to move upward, thereby moving it to the outside of the connecting groove 7, thereby realizing the separation between the first casing 1 and the second casing 6. In addition, in order to facilitate the rotation of the limit plate 413, the two screws 506 are first rotated to move them to the outside of the pressure-resistant block 505 respectively, thereby driving the two positioning balls 509 to move to the outside of the groove 504 respectively, until they are completely moved out of the inside of the groove 504, thereby releasing the limit on the torsion block 503, and then the torsion block 503 can be rotated upward to move it to a position perpendicular to the limit plate 413, and then the limit plate 413 can be rotated. When the torsion block 503 moves out of the inside of the pressure-resistant block 505, the two screws are rotated again. 506, so that they move toward the inside of the anti-compression block 505 respectively, until the outer walls of the two screws 506 are completely in contact with the outer surface of the anti-compression block 505, so that the two positioning balls 509 move to the inside of the anti-compression block 505 respectively. After the torsion block 503 drives the sleeve 404 to move to the specified position, the torsion block 503 is rotated to the inside of the anti-compression block 505 again, so that the two positioning balls 509 are squeezed, driving the two second springs 508 to shorten. When the two grooves 504 are rotated to correspond to the positions of the two screws 506, the two positioning balls 509 can be reset under the elastic action of the second springs 508, and move to the inside of the two grooves 504 respectively, that is, the torsion block 503 is limited.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A detachable casing structure for drilling a pile foundation in a hard rock formation, comprising a first casing (1) and a second casing (6), wherein a positioning assembly (4) is arranged on the outer surface of the first casing (1), and a connecting assembly (8) is arranged on the outer surface of the second casing (6); Features: The positioning assembly (4) comprises a first connecting sleeve (401), the inner wall of which is movably embedded with a plurality of threaded tubes (403), one end of each of the plurality of threaded tubes (403) being fixedly mounted with a driven gear (402), the outer surfaces of each of the plurality of threaded tubes (403) being threadedly sleeved with a sleeve (404), the other ends of each of the plurality of threaded tubes (403) being fixedly connected with a conical block (405), the outer surfaces of each of the plurality of sleeves (404) being provided with a slot (406), and the interiors of each of the plurality of slots (406) being movably embedded with a A limiting tube (407), the outer surfaces of the plurality of driven gears (402) are meshedly connected with driving gears (408), the outer surfaces of the plurality of driving gears (408) are fixedly connected with limiting columns (409), the outer surface of the first connecting sleeve (401) is provided with a plurality of limiting grooves (410), the outer surface of the first connecting sleeve (401) is fixedly mounted with a second connecting sleeve (411), an extension rod (412) is movably embedded inside the second connecting sleeve (411), and a limiting plate (413) is fixedly mounted on one end of the extension rod (412); A limiting assembly (5) is arranged on the outer surface of the limiting plate (413), and the limiting assembly (5) comprises two reinforcing blocks (501), the outer surfaces of the two reinforcing blocks (501) are fixedly connected to the outer surface of the limiting plate (413), a damping shaft (502) is arranged between the outer surfaces of the two limiting plates (413), and a torsion block (503) is arranged on the outer surface of the damping shaft (502); The opposite outer surfaces of the torsion block (503) are provided with grooves (504); an anti-compression block (505) is fixedly mounted on the outer surface of the second connecting sleeve (411); two screw rods (506) are threadedly connected to the inner wall of the anti-compression block (505); a second damper (507) is fixedly mounted on one end of the two screw rods (506); and a second spring (508) is disposed on the outer surface of the two second dampers (507); A positioning ball (509) is fixedly mounted on one end of each of the two second dampers (507), one end of each of the two second springs (508) is fixedly connected to one end of each of the two screw rods (506), and the other ends of each of the two second dampers (507) are fixedly connected to the outer surfaces of the two positioning balls (509); The inner wall of the first connecting sleeve (401) is fixedly connected to the outer surface of the first casing (1); one end of the plurality of limiting tubes (407) is movably connected to the outside of the plurality of slots (406); one end of the plurality of limiting tubes (407) is movably connected to the outside of the first connecting sleeve (401); the outer surfaces of the plurality of limiting columns (409) are rotatably connected to the inside of the plurality of limiting slots (410); the other end of the extension rod (412) is fixedly connected to the outer surface of one of the driving gears (408); and the inner wall of the second connecting sleeve (411) is fixedly connected to the outer surface of the first connecting sleeve (401); The connecting assembly (8) comprises a circular ring (801), the inner wall of the circular ring (801) is fixedly connected to the outer surface of the second casing (6), the outer surface of the circular ring (801) is provided with a plurality of circular grooves (802), the inner walls of the plurality of circular grooves (802) are each provided with two auxiliary grooves (803), and the inner walls of the plurality of auxiliary grooves (803) are each fixedly connected to a first damper (804); A first spring (805) is disposed on the outer surface of each of the plurality of first dampers (804); an inclined block (806) is fixedly mounted on one end of each of the plurality of first dampers (804); one end of each of the plurality of first springs (805) is fixedly connected to the inner wall of each of the plurality of auxiliary grooves (803); and the other end of each of the plurality of first springs (805) is fixedly connected to the outer surface of each of the plurality of inclined blocks (806).

2. The detachable casing structure for drilling pile foundation in hard rock formation according to claim 1 is characterized by: Multiple circular holes (807) are formed on the outer surfaces of the multiple inclined blocks (806), and limiting shafts (808) are fixedly embedded between the relative inner walls of the multiple circular holes (807). Rollers (809) are rotatably sleeved on the outer surfaces of the multiple limiting shafts (808), and the outer surfaces of the multiple rollers (809) are movable and penetrate the outside of the multiple circular holes (807).

3. The detachable casing structure for drilling pile foundation in hard rock formation according to claim 2 is characterized by: One end of the first protective tube (1) is provided with a mounting groove (2), a sealing ring (3) is arranged inside the mounting groove (2), and one end of the second protective tube (6) is provided with a connecting groove (7).

4. A process for constructing a detachable casing for drilling into a pile foundation in a hard rock formation, characterized in that: The detachable casing structure for drilling into a pile foundation in a hard rock formation as described in claim 3 is used. The following steps are involved: Step 1: During the construction of pile foundation, casing is an important device to protect the hole mouth, locate the pile position and maintain the water head in the hole. When a longer casing needs to be installed, First, ensure the normal operation of the external crane and lifting equipment, and carry out necessary maintenance and inspection. Then, select appropriate lifting belts and hooks according to the weight and shape of the casing. Calculate the best lifting point position according to the shape and weight of the casing to ensure that the casing remains balanced during the lifting process. Connect the lifting belt firmly to the lifting point of the connecting component (8) in the second casing (6). Ensure that it is fixed reliably and take anti-slip and anti-damage measures. Under the command of the crane operator, slowly raise the second casing (6) to ensure that it remains vertical and stable at a certain height from the ground. Step 2: During the lifting process, monitor the status of the casing, slowly lower the second casing (6) to the predetermined position, ensure that it is aligned with the base, and use an external level to check the verticality and horizontality of the casing to ensure that it is correctly positioned; Step 3: After the second casing (6) is placed, the second casing (6) is gently placed into the pre-drilled hole to ensure that the lower end of the casing is in contact with the foundation. When the second casing (6) is implanted, one end of the positioning component (4) in the first casing (1) is moved to a position corresponding to the connecting component (8) by an external crane again; Step 4: After the top views of the first connecting sleeve (401) and the circular ring (801) overlap, the plurality of conical blocks (405) are rotated to positions corresponding to the plurality of circular grooves (802), and then the first connecting sleeve (401) is driven downward by a crane, so that the plurality of conical blocks (405) are moved downward, so that the plurality of conical blocks (405) are respectively inserted into the corresponding circular grooves (802), and the plurality of conical blocks (405) are respectively fixed in the plurality of circular grooves (802), thereby achieving connection and sealing between the first casing (1) and the second casing (6); Step 5: When the casing needs to be removed from the hard rock formation, first use an external crane to move the first casing (1) to the ground through the action of the sling and the hook. When the positioning assembly (4) and the connecting assembly (8) are completely moved above the ground, the limit plate (413) is rotated to drive the casing (404) to move downward, so that the casing (404) and the conical block (405) form a whole. Then, the first casing (1) can be moved upward by the external crane, thereby driving the casing (404) to move upward, and then driving the conical block (405) to move upward to the outside of the circular groove (802).

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