A long casing following drilling device for cast-in-place pile construction

Abstract

This invention discloses a long casing follow-drilling device for cast-in-place pile construction, belonging to the field of building construction technology. It includes a casing drive assembly and a casing support assembly. The casing drive assembly includes a connecting cylinder body. Several rotating plates are evenly distributed around the outer wall of the connecting cylinder body. One end of each rotating plate is rotatably connected to the connecting cylinder body, and the other end of each rotating plate has a limiting post. One end of the limiting post is fixed to the connecting plate, and the other end faces the outer wall of the connecting cylinder body. The rotating plate has an installation groove, and a support spring is installed within the installation groove. Both ends of the support spring are fixed to the installation groove and the outer wall of the connecting cylinder body, respectively. Near the other end of the rotating plate, the connecting cylinder body has several first rectangular grooves around its circumference, and these first rectangular grooves correspond to the positions of the limiting posts. This technical solution improves the connection and disassembly efficiency between the casing drive assembly and the casing, thereby improving construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a long casing follow-up drilling device for cast-in-place pile construction. Background Technology

[0002] In modern construction engineering, cast-in-place pile construction is a widely used foundation treatment technology with advantages such as high bearing capacity, low construction noise, and strong adaptability. However, drilling operations face many challenges during cast-in-place pile construction. For example, the drilling effect is affected by geological conditions, such as loose soil layers and quicksand layers, which can easily lead to problems such as borehole wall collapse and diameter reduction, seriously affecting construction quality and progress.

[0003] Therefore, a long casing drilling technique is required during drilling. By simultaneously advancing the long casing during the drilling process, the borehole wall is effectively protected, preventing collapse and diameter reduction. This technique can adapt to various complex geological conditions, ensuring the verticality and accuracy of the borehole, thus providing a good foundation for subsequent cast-in-place pile construction.

[0004] However, existing long casing follow-up drilling devices still have some shortcomings in practical applications. For example, during the drilling process, a casing drive assembly is required. The existing casing drive assembly and casing are usually connected by bolts. Therefore, the connection and disassembly of the casing drive assembly and casing must be done manually, which cannot achieve rapid connection and disassembly, which obviously reduces construction efficiency. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a long casing follow-up drilling device for cast-in-place pile construction, so as to improve the connection and disassembly efficiency of the casing drive assembly and the casing, thereby improving the construction efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A long casing follow-up drilling device for cast-in-place pile construction includes a casing drive assembly and a casing support assembly. The casing drive assembly includes a connecting casing body. A plurality of rotating plates are evenly distributed around the outer wall of the connecting casing body. One end of each rotating plate is rotatably connected to the connecting casing body, and the other end of each rotating plate has a limiting post. One end of the limiting post is fixed to the connecting plate, and the other end faces the outer wall of the connecting casing body. The rotating plate has an installation groove, and a support spring is installed within the installation groove. Both ends of the support spring are respectively fixed to the installation groove and the outer wall of the connecting casing body. A plurality of first rectangular grooves are provided around the circumference of the connecting casing body near the other end of the rotating plate. The positions of the first rectangular grooves correspond to the positions of the limiting posts, and the width of the first rectangular grooves is... Matching the diameter of the limiting post, a plurality of first connecting blocks are circumferentially provided on the outer side of the end of the connecting cylinder body. An annular elastic rope is provided on the first connecting block. The annular elastic rope is used to limit the end position of the rotating plate, so that the limiting post is located in or out of the first rectangular groove. The inner wall of the end of the connecting cylinder body with the first rectangular groove is provided with a first annular groove. The supporting protective cylinder assembly includes a protective cylinder body. The outer wall of the end of the protective cylinder body connected to the connecting cylinder body is provided with a second annular groove. A plurality of second rectangular grooves are provided on the end of the protective cylinder body connected to the connecting cylinder body. A plurality of first rectangular grooves and a plurality of first rectangular grooves can be arranged to correspond one-to-one and coincidentally. The width of the second rectangular groove matches the width of the first rectangular groove. The length of the second rectangular groove is greater than the diameter of the limiting post.

[0007] Furthermore, a third rectangular groove is provided on the outer wall of the connecting cylinder body and on the fixing parts of the several supporting springs. A guide crossbar is provided on the inner wall of the third rectangular groove. The two ends of the guide crossbar are respectively fixed on the inner wall of the third rectangular groove. A slip ring is provided in the first annular groove. The outer surface of the slip ring is in sliding contact with the inner wall of the first annular groove. A traction rope is provided inside the several supporting springs. One end of the traction rope is fixed to the rotating plate, and the other end of the traction rope is fixed to the outer wall of the slip ring. The traction rope is located below the guide crossbar.

[0008] Furthermore, the inner wall of the other end of the protective casing body is provided with a third annular groove, and a plurality of locking bolts are provided on the protective casing body outside the third annular groove. The locking bolts are threadedly connected to the protective casing body, and the positions of the plurality of locking bolts correspond to the positions of the plurality of second rectangular grooves. The locking bolts are used to connect and limit the adjacent two supporting protective casings.

[0009] Furthermore, a slider is provided on the outer surface of the slip ring, one end of the slider is fixed to the slip ring, and the other end of the slider is slidably connected in the third rectangular groove.

[0010] Furthermore, the rotating plate is provided with a rotating shaft at its end, and a second connecting block is provided at both ends of the rotating shaft. One end of the second connecting block is rotatably connected to the rotating shaft, and the other end of the second connecting block is fixed to the outer wall of the connecting cylinder body.

[0011] Furthermore, the main body of the casing is provided with a plurality of receiving grooves, the plurality of receiving grooves being positioned corresponding to the positions of a plurality of locking bolts, and when the locking bolts are tightened, the locking bolts are located within the receiving grooves.

[0012] Furthermore, it also includes a moving component, a position adjustment component, a drive component, and a drilling component. The position adjustment component connects the drive component to the moving component, the drilling component is connected to the drive component, the casing drive component connects the supporting casing component to the drive component, and the rotating rod component is located inside the casing drive component and the supporting casing component.

[0013] Furthermore, the sleeve drive assembly and the drive assembly are detachably connected via a pin.

[0014] The beneficial effects of this invention are as follows: In this technical solution, by rotating the plate to drive the limiting post to be located in the first rectangular groove and the second rectangular groove, a reliable connection between the connecting cylinder body and the casing body can be achieved. The connection method is simple and efficient, which can greatly improve drilling efficiency.

[0015] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic cross-sectional view of the front view of the drilling device of the present invention; Figure 2 This is a three-dimensional schematic diagram showing the connection between the casing drive assembly, the casing support assembly, the drilling assembly, and the drive assembly in this invention. Figure 3 This is a three-dimensional schematic diagram of the casing drive assembly in the drilling device of the present invention; Figure 4 This is a schematic cross-sectional view of the casing drive assembly in the drilling device of the present invention; Figure 5 This is a three-dimensional schematic diagram of the external structure of the casing drive assembly in the drilling device of the present invention; Figure 6This is a three-dimensional schematic diagram of the connecting cylinder body in the drilling device of the present invention; Figure 7 This is a three-dimensional schematic diagram of the support casing assembly in the drilling device of the present invention.

[0017] The following labels are shown in the attached diagram: 1. Moving component; 2. Position adjustment component; 3. Drive component; 4. Drill rod; 5. Drill bit; 6. Casing drive component; 610. Connecting cylinder body; 611. Second connecting block; 612. Rotating shaft; 613. Rotating plate; 614. Mounting slot; 615. Support spring; 616. Limiting post; 617. First rectangular slot; 618. First connecting block; 619. Annular elastic rope; 620. Third rectangular slot; 621. Guide crossbar; 622. Slip ring; 623. Traction rope; 624. First annular slot; 7. Casing support component; 710. Casing body; 711. Second annular slot; 712. Second rectangular slot; 713. Locking bolt; 714. Third annular slot. Detailed Implementation

[0018] like Figures 1-7As shown, a long casing follow-up drilling device for cast-in-place pile construction includes a casing drive assembly 6 and a casing support assembly 7. The casing drive assembly 6 includes a connecting cylinder body 610. A plurality of rotating plates 613 are evenly distributed around the outer wall of the connecting cylinder body 610. The rotating plates 613 are vertically arranged. One end of the rotating plate 613 is rotatably connected to the connecting cylinder body 610. A limiting post 616 is provided on the other end of the rotating plate 613. One end of the limiting post 616 is fixed to the connecting plate, and the other end of the limiting post 616 faces the outer wall of the connecting cylinder body 610. The rotating plate 613 is provided with an installation recess. In this specific embodiment, the mounting groove 614 can be understood as follows: the rotating plate 613 has a bent portion that protrudes outward, and the inner wall of the bent portion is the mounting groove 614. A support spring 615 is provided in the mounting groove 614, and the two ends of the support spring 615 are respectively fixed in the mounting groove 614 and on the outer wall of the connecting cylinder body 610. A plurality of first rectangular grooves 617 are provided on the circumference of the connecting cylinder body 610 near the other end of the rotating plate 613. The positions of the plurality of first rectangular grooves 617 correspond to the positions of the plurality of limiting posts 616 (in terms of quantity and circumference). The distances between the evenly distributed rectangular grooves are equal, and the width of the first rectangular groove 617 matches the diameter of the limiting post 616 (or it can be slightly larger to facilitate the entry of the limiting post 616, for example, 0.5-1cm larger). Several first connecting blocks 618 are circumferentially arranged on the outer side of the end of the connecting cylinder body 610. An annular elastic rope 619 is provided on each first connecting block 618. The annular elastic rope 619 is used to limit the end position of the rotating plate 613, so that the limiting post 616 is located within or detached from the first rectangular groove 617. The end of the connecting cylinder body 610 is provided with the first rectangular groove 617. The inner wall of the part is provided with a first annular groove 624; the support sleeve assembly 7 includes a sleeve body 710, the outer wall of the end where the sleeve body 710 is connected to the connecting sleeve body 610 is provided with a second annular groove 711, and a plurality of second rectangular grooves 712 are provided on the end where the sleeve body 710 is connected to the connecting sleeve body 610. A plurality of first rectangular grooves 617 and a plurality of first rectangular grooves 617 can be arranged to overlap one-to-one (the setting position and quantity are corresponding), and the width of the second rectangular groove 712 matches the width of the first rectangular groove 617. The length of the second rectangular groove 712 is greater than the diameter of the limiting post 616.

[0019] The working principle of the above technical solution is as follows: When the protective sleeve drive assembly 6 and the supporting protective sleeve assembly 7 are connected, the first annular groove 624 provided on the end of the connecting sleeve body 610 is first sleeved onto the second annular groove 711 provided on the protective sleeve body 710 (this can be understood as the end diameter of the connecting sleeve body 610 being larger than the diameter of the protective sleeve body 710, thus achieving the sleeve connection). After the sleeve connection is completed, the connecting sleeve body 610 is controlled to rotate, so that the positions of several first rectangular grooves 617 and second rectangular grooves 712 are aligned. At this time, it is only necessary to manually squeeze the annular elastic rope 619 onto the outer wall of the end of the rotating plate 613 (it is easy to understand that a slot should be provided on the outer surface of the rotating plate 613, and the annular elastic rope 619 is located in the slot to prevent the annular elastic rope 619 from detaching). At this time, the force of the annular elastic rope 619 can compress the supporting spring 615, thereby causing the end of the rotating plate 613 to rotate inward, so that the limiting post 616 is located in the first rectangular groove 617 and the second rectangular groove 712, thus achieving the end connection between the connecting sleeve body 610 and the protective sleeve body 710.

[0020] It should be noted that after the limiting post 616 is located within the first rectangular groove 617 and the second rectangular groove 712, it can limit the relative sliding of the ends of the casing body 710 and the connecting cylinder body 610, preventing them from separating. At the same time, the limiting post 616, in contact with the sidewalls of the first rectangular groove 617 and the second rectangular groove 712, can also prevent relative rotation between the casing body 710 and the connecting cylinder body 610. That is, during drilling operations, under the action of the drive assembly 3 and the position adjustment assembly 2, the connecting cylinder body 610 will be driven to rotate and move downward, thereby allowing the connecting cylinder body to pass through. Body 610 pushes the casing body 710 downward and rotates it, thus rotating and lowering the casing body 710 into the pile hole to support the inner wall of the pile hole. Once the casing body 710 has moved a certain distance, the annular elastic rope 619 is released from its limiting position on the end of the rotating plate 613. Under the action of the support spring 615, the end of the rotating plate 613 rotates outward, causing the limiting post 616 to disengage from the first rectangular groove 617 and the second rectangular groove 712, thereby separating the connecting cylinder body 610 from the casing body 710. It is easy to understand that the lengths of the first rectangular groove 617 and the second rectangular groove 712 should be such that when the rotating plate 613 rotates, the limiting post 616 at its end can enter without interfering with the outer wall of the connecting cylinder body 610.

[0021] The beneficial effects of the above technical solution are that by rotating the plate 613 to drive the limiting post 616 to be located in the first rectangular groove 617 and the second rectangular groove 712, a reliable connection can be achieved between the connecting cylinder body 610 and the protective casing body 710. The connection method is simple and efficient, which can greatly improve drilling efficiency. At the same time, this connection method can drive the protective casing body 710 to rotate regardless of whether the connecting cylinder body 610 rotates forward or backward, and the two will not separate. In the existing technology, the connection method of the slot and the block can easily separate the connecting cylinder body 610 and the protective casing body 710 when rotating backward, resulting in an unstable connection.

[0022] In one feasible embodiment, a third rectangular groove 620 is provided on the outer wall of the connecting cylinder body 610 and on the fixing parts of the plurality of support springs 615. A guide crossbar 621 is provided on the inner wall of the third rectangular groove 620, and the two ends of the guide crossbar 621 are respectively fixed on the inner wall of the third rectangular groove 620. A slip ring 622 is provided in the first annular groove 624, and the outer surface of the slip ring 622 is in sliding contact with the inner wall of the first annular groove 624. A traction rope 623 is provided inside the plurality of support springs 615. One end of the traction rope 623 is fixed on the rotating plate 613, and the other end of the traction rope 623 is fixed on the outer wall of the slip ring 622. The traction rope 623 is located below the guide crossbar 621.

[0023] The working principle of the above technical solution is as follows: It should be noted in advance that during the drilling operation, the drive component 3 and the position adjustment component 2 apply a downward pressure and a rotational force to the connecting cylinder body 610. After one section of the casing body 710 enters the pile hole, the connecting cylinder body 610 needs to be moved upward to detach from the current casing body 710 so as to connect another casing body 710 (the other casing body 710 can be hoisted onto the casing body 710 in the pile hole by a small crane, etc.) to achieve continuous drilling. The end of the other casing body 710 also needs to be connected to the casing body 710 in the pile hole so as to facilitate the later extraction of the casing.

[0024] Therefore, this configuration utilizes this working characteristic to further improve the efficiency and stability of the rapid connection between the connecting cylinder body 610 and the protective cylinder body 710; the specific working principle is as follows: When the connecting cylinder body 610 is connected to the protective cylinder body 710, it is only necessary for the first annular groove 624 on the connecting cylinder body 610 to be sleeved onto the second annular groove 711 on the protective cylinder body 710. Under the action of gravity or the position adjustment component 2, the connecting cylinder body 610 will move downward, that is, the end of the protective cylinder body 710 will move upward within the first annular groove 624, that is, abut against the slip ring 622, and push the slip ring 622 to move upward within the first annular groove 624, thereby providing... The traction rope 623 applies a force, which, under the action of the guide crossbar 621 (which can be understood as a fixed pulley), pulls the rotating plate 613 to rotate inward, thereby rotating the limiting post 616 into the first rectangular groove 617 and the second rectangular groove 712, thus connecting the connecting cylinder body 610 and the protective casing body 710. It is easy to understand that during drilling, the connecting cylinder body 610 will apply a downward pressure to the protective casing body 710. Therefore, the end of the protective casing body 710 will always be pressed against the slip ring 6. 22, meaning the traction rope 623 will always limit the deflection angle of the deflection plate, thus ensuring that the limiting post 616 is always located within the first rectangular groove 617 and the second rectangular groove 712. This further guarantees the connection stability between the connecting cylinder body 610 and the casing body 710 during drilling (avoiding vibration causing the annular elastic rope 619 to detach). When the connecting cylinder body 610 needs to detach from the casing body 710 that has entered the pile hole, it is only necessary to pull the connecting cylinder body 610 upwards, i.e., due to the second rectangular groove... Since 712 is relatively long, the limiting post 616 will slide in the second rectangular groove 712, that is, the end of the protective cylinder body 710 will disengage from the slip ring 622, thus losing the restriction on the deflection plate. Therefore, under the action of the support spring 615, the deflection plate will rotate outward, thereby pulling the traction rope 623, which in turn causes the slip ring 622 to move down and reset under the action of the traction rope 623 and gravity, thereby causing the limiting post 616 to disengage from the first rectangular groove 617 and the second rectangular groove 712, thus causing the two to automatically disengage. It is easy to understand that in this specific embodiment, the application scenario of the annular elastic rope 619 is when the connecting cylinder body 610 is under tension, such as when it is necessary to pull out the protective cylinder body 710 or to hoist another protective cylinder body 710 through the connecting cylinder body 610. Of course, if the splicing between the protective cylinder bodies 710 is completed by a crane, then there is no need to use the annular elastic rope 619 to additionally limit the rotating plate 613 (it can also be used in conjunction with the annular elastic rope 619, because during construction, there will be a large vibration, and the elastic rope may vibrate and detach. Therefore, by setting up components such as the traction rope 623, the problem of the annular elastic rope 619 being vibrated and detached can be avoided).

[0025] It should also be noted that with this setup, there is no need to deliberately align the positions of the first rectangular groove 617 and the second rectangular groove 712 during connection (in existing technologies, the positions of the locking block and the locking groove need to be aligned to achieve connection). Therefore, during the fitting process, it is only necessary to first fit to a certain depth, so that the slip ring 622 is compressed, thereby causing the limiting post 616 to abut against the surface of the casing body 710 (the traction rope 623 can be an elastic rope, that is, the force of the elastic rope under tension will apply an inward rotational force to the rotating plate 613). When the limiting post 616 is aligned with the second rectangular groove 712, it will be pulled directly into the second rectangular groove 712 by the traction rope 623. It is easy to understand that the traction rope 623 is located in the third rectangular groove and will not contact the side wall of the protective cylinder body 710, thus avoiding the problem of shearing damage. Then, the driving component 3 drives the connecting cylinder body 610 to rotate, which will rotate the limiting post 616 to the second rectangular groove 712. Then the limiting post 616 will engage with the second rectangular groove 712, thus realizing the connection.

[0026] In one feasible embodiment, the inner wall of the other end of the casing body 710 is provided with a third annular groove 714, and a plurality of locking bolts 713 are provided on the casing body 710 outside the third annular groove 714. The locking bolts 713 are threadedly connected to the casing body 710, and the positions of the plurality of locking bolts 713 correspond to the positions of the plurality of second rectangular grooves 712. The locking bolts 713 are used to connect and limit the adjacent two supporting casings.

[0027] The working principle of the above technical solution is as follows: When multiple sections of the casing body 710 need to be spliced ​​together, the third annular groove 714 on the upper casing body 710 can be fitted onto the second annular groove 711 on the lower casing body 710. Then, by rotating the locking bolt 713, the locking bolt 713 passes through the second rectangular groove 712, thereby reliably connecting the ends of the upper and lower casing bodies 710, preventing them from separating, and facilitating subsequent drilling and extraction. This standardizes the supporting casing assembly 7, enabling it to reliably connect with the casing drive assembly 6 while also ensuring reliable connection between adjacent supporting casing assemblies 7.

[0028] In one feasible embodiment, a slider is provided on the outer surface of the slip ring 622. One end of the slider is fixed to the slip ring 622, and the other end of the slider is slidably connected in the third rectangular groove 620. This prevents the slip ring 622 from rotating inside the first annular groove 624, which would cause the traction rope 623 to be subjected to non-vertical movement and tension, resulting in abnormal deflection of the rotating plate 613.

[0029] In one feasible embodiment, the end of the rotating plate 613 is provided with a rotating shaft 612, and both ends of the rotating shaft 612 are provided with second connecting blocks 611. One end of the second connecting block 611 is rotatably connected to the rotating shaft 612, and the other end of the second connecting block 611 is fixed to the outer wall of the connecting cylinder body 610.

[0030] In one feasible embodiment, the casing body 710 is provided with a plurality of receiving grooves, the plurality of receiving grooves being positioned corresponding to the positions of a plurality of locking bolts 713. When the locking bolts 713 are tightened, the locking bolts 713 are located within the receiving grooves, which can prevent the ends of the locking bolts 713 from being located outside the outer wall of the casing body 710, thus avoiding the problem of movement interference with the pile hole.

[0031] In one feasible embodiment, the system further includes a moving component 1, a position adjustment component 2, a drive component 3, and a drilling component. The position adjustment component 2 connects the drive component 3 to the moving component 1, the drilling component is connected to the drive component 3, and the casing drive component 6 connects the supporting casing component 7 to the drive component 3. The rotating rod component is located inside the casing drive component 6 and the supporting casing component 7. It should be noted that the moving component 1, position adjustment component 2, drive component 3, and drilling component are all prior art. For example, the moving component 1 is a moving vehicle; the position adjustment component 2 includes a rotating component and a telescopic component, which can be implemented by a rotary motor and a hydraulic rod to adjust the height and tilt angle of the drive component 3; the drilling component includes a drill rod 4 and a drill bit 5; the drive component 3 drives the drill rod 4 to rotate; and the position adjustment component 2 drives the drill rod 4 to move vertically. Those skilled in the art can refer to the specific structure of existing rotary drilling rigs, which will not be elaborated upon here. Meanwhile, in one feasible embodiment, the sleeve drive assembly 6 and the drive assembly 3 are detachably connected by a pin, that is, by inserting the pin to avoid relative rotation and vertical movement. This is existing technology and will not be described in detail here.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A long casing drilling device for cast-in-place pile construction, characterized in that: The device includes a casing drive assembly and a casing support assembly. The casing drive assembly includes a connecting cylinder body. A plurality of rotating plates are evenly distributed around the outer wall of the connecting cylinder body. One end of each rotating plate is rotatably connected to the connecting cylinder body, and the other end of each rotating plate has a limiting post. One end of the limiting post is fixed to the connecting plate, and the other end faces the outer wall of the connecting cylinder body. The rotating plate has a mounting groove, and a support spring is installed within the mounting groove. Both ends of the support spring are respectively fixed to the mounting groove and the outer wall of the connecting cylinder body. A plurality of first rectangular grooves are distributed around the circumference of the connecting cylinder body near the other end of the rotating plate. The positions of the first rectangular grooves correspond to the positions of the limiting posts, and the width of the first rectangular groove is equal to the diameter of the limiting post. Matching the first connecting cylinder body, a plurality of first connecting blocks are provided circumferentially on the outer side of the end of the connecting cylinder body. An annular elastic rope is provided on the first connecting block. The annular elastic rope is used to limit the end position of the rotating plate, so that the limiting post is located in or out of the first rectangular groove. The inner wall of the end of the connecting cylinder body with the first rectangular groove is provided with a first annular groove. The supporting protective cylinder assembly includes a protective cylinder body. The outer wall of the end of the protective cylinder body connected to the connecting cylinder body is provided with a second annular groove. A plurality of second rectangular grooves are provided on the end of the protective cylinder body connected to the connecting cylinder body. A plurality of first rectangular grooves and a plurality of first rectangular grooves can be arranged to correspond one-to-one and coincidentally. The width of the second rectangular groove matches the width of the first rectangular groove. The length of the second rectangular groove is greater than the diameter of the limiting post.

2. The long casing drilling device for cast-in-place pile construction according to claim 1, characterized in that: The outer wall of the connecting cylinder body and the fixing parts of the several supporting springs are each provided with a third rectangular groove. The inner wall of the third rectangular groove is provided with a guide crossbar. The two ends of the guide crossbar are respectively fixed to the inner wall of the third rectangular groove. A slip ring is provided in the first annular groove. The outer surface of the slip ring is in sliding contact with the inner wall of the first annular groove. Each of the several supporting springs is provided with a traction rope. One end of the traction rope is fixed to the rotating plate, and the other end of the traction rope is fixed to the outer wall of the slip ring. The traction rope is located below the guide crossbar.

3. The long casing drilling device for cast-in-place pile construction according to claim 1, characterized in that: The inner wall of the other end of the protective casing body is provided with a third annular groove. Several locking bolts are provided on the protective casing body outside the third annular groove. The locking bolts are threadedly connected to the protective casing body. The positions of the locking bolts correspond to the positions of the second rectangular grooves. The locking bolts are used to connect and limit the adjacent two supporting protective casings.

4. The long casing drilling device for cast-in-place pile construction according to claim 2, characterized in that: The outer surface of the slip ring is provided with a slider, one end of which is fixed to the slip ring, and the other end of which is slidably connected to the third rectangular groove.

5. The long casing drilling device for cast-in-place pile construction according to claim 1, characterized in that: The rotating plate is provided with a rotating shaft at its end, and a second connecting block is provided at both ends of the rotating shaft. One end of the second connecting block is rotatably connected to the rotating shaft, and the other end of the second connecting block is fixed to the outer wall of the connecting cylinder body.

6. The long casing drilling device for cast-in-place pile construction according to claim 3, characterized in that: The main body of the casing is provided with a plurality of receiving grooves, and the plurality of receiving grooves are located in a manner corresponding to the positions of a plurality of locking bolts. When the locking bolts are tightened, the locking bolts are located in the receiving grooves.

7. The long casing drilling device for cast-in-place pile construction according to claim 1, characterized in that: It also includes a moving component, a position adjustment component, a drive component, and a drilling component. The position adjustment component connects the drive component to the moving component. The drilling component is connected to the drive component. The casing drive component connects the casing support component to the drive component. The rotating rod component is located inside the casing drive component and the casing support component.

8. A long casing drilling device for cast-in-place pile construction according to claim 7, characterized in that: The casing drive assembly and the drive assembly are detachably connected via a pin.

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