A casing for drilling

Abstract

This utility model provides a casing for drilling, comprising: a sleeve, a sealing ring, an upper annular platform, a lower annular platform, a lower abutment mechanism, and an upper abutment mechanism. One end of the sleeve is fixedly connected to the upper annular platform, and the other end is fixedly connected to the lower annular platform. The sleeve has a first slot for inserting a steel casing and a second slot for inserting a steel pipe pile. The sealing ring is provided in both the first and second slots. The lower abutment mechanism is disposed on the upper surface of the lower annular platform for abutting and fixing the steel pipe pile. The upper abutment mechanism is disposed on the upper surface of the upper annular platform for abutting and fixing the steel casing. The casing of this utility model is easy to operate and can quickly and efficiently connect the steel pipe pile and the steel casing.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular relates to a casing for drilling. Background Technology

[0002] With the continuous advancement of near-shore infrastructure construction, especially in projects such as port and waterway dredging, offshore wind power foundations, deep-water wharves, and cross-sea bridges, steel pipe composite piles, as an integrated foundation form that combines load-bearing and retaining wall functions, are widely used in pile foundation construction under complex hydrological and geological conditions. In traditional construction, the connection between steel casings and steel pipe piles is mostly achieved through welding or flange connections. However, in actual marine environments, these connection methods have a series of engineering drawbacks. Welded structures have long construction cycles, strong environmental dependence, and are difficult to assemble and reuse quickly. Flange bolt connections require welding the flange to the ends of both the steel casing and the steel pipe pile, which is cumbersome and has problems such as insufficient sealing.

[0003] Meanwhile, current offshore construction demands increasingly higher standards for equipment standardization, construction efficiency, erosion resistance, and water-stopping performance. There is an urgent need for a steel casing and steel pipe pile insertion structure that is structurally stable, reliably sealed, easy to install, and highly adaptable to meet the technical requirements of steel pipe composite pile construction in marine environments. Utility Model Content

[0004] In view of this, the present invention aims to provide a casing for drilling, in order to solve the problems of cumbersome construction of connection structures, insufficient sealing performance, and inability to achieve rapid assembly in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A casing for drilling includes: a sleeve, a sealing ring, an upper annular platform, a lower annular platform, a lower abutment mechanism, and an upper abutment mechanism;

[0007] The sleeve is fixedly connected to the upper annular platform at one end and to the lower annular platform at the other end. The sleeve has a first slot for inserting a steel casing and a second slot for inserting a steel pipe pile. The sealing ring is provided in both the first slot and the second slot. The lower abutment mechanism is provided on the upper surface of the lower annular platform for abutting and fixing the steel pipe pile. The upper abutment mechanism is provided on the upper surface of the upper annular platform for abutting and fixing the steel casing.

[0008] Furthermore, both the inner wall of the first slot and the inner wall of the second slot are provided with limiting members for limiting the sealing ring. The sealing ring includes a contact section, a transition section, and a limiting section that are fixedly connected. The limiting member is provided with an annular channel for the transition section to pass through. A first limiting cavity for receiving the limiting section is formed between the bottom surface of the first slot and the limiting member. A second limiting cavity for receiving the limiting section is formed between the bottom surface of the second slot and the limiting member. The contact section is used to abut against the steel pipe pile and / or the steel casing.

[0009] Furthermore, the end face of the contact section opposite to the transition section has an embedded annular groove; furthermore, the lower end abutment mechanism includes a lower end fixing member, an abutment screw, a guide block, a connecting rod, and a lower end abutment block.

[0010] The lower end fixing member is fixedly connected to the upper surface of the lower end ring platform. The lower end fixing member has a receiving cavity for receiving the guide block. The lower end ring platform is provided with a through groove communicating with the receiving cavity. The guide block is fixedly connected to the connecting rod. The connecting rod passes through the lower end ring platform through the through groove. The end of the connecting rod away from the guide block is fixedly connected to the lower end abutment block. The end of the lower end fixing member away from the sleeve is fixedly connected to a threaded cylinder. The threaded cylinder has a first threaded hole for threaded connection with the abutment screw. The first threaded hole communicates with the receiving cavity. The abutment screw extends into the receiving cavity through the first threaded hole and abuts against the guide block.

[0011] Furthermore, a guide rod is fixedly connected to the guide block, and a guide groove communicating with the storage cavity is provided on the lower end fixing member, with the guide rod slidably connected to the guide groove.

[0012] Furthermore, the lower end fixing member is provided with an elastic abutment component;

[0013] The elastic abutment assembly includes an abutment spring, an abutment rod, a limiting ring platform, a limiting baffle, and a mounting cylinder. The mounting cylinder is fixedly connected to the upper surface of the lower end fixing member and has a receiving cavity communicating with the receiving cavity. The limiting ring platform is fixedly connected to the inner wall of the receiving cavity. The limiting ring platform has a through hole for the abutment rod to pass through. The limiting baffle is fixedly connected to the abutment rod. The abutment spring is sleeved on the abutment rod, and one end of the abutment spring abuts against the bottom surface of the receiving cavity opposite to the lower end fixing member. The other end of the abutment spring abuts against the limiting baffle. The abutment rod can extend through the receiving cavity into the receiving cavity and abut against the guide block.

[0014] Furthermore, the abutting rod has an abutting state and an extended state. When the abutting rod is in the abutting state, the limiting ring platform and the limiting baffle are separated from each other. When the abutting rod is in the extended state, the lower surface of the limiting baffle abuts against the upper surface of the limiting ring platform.

[0015] The guide block is provided with a guide ramp.

[0016] Furthermore, the lower end abutment block has a first abutment surface for abutting the steel pipe pile, and a rubber pad layer is provided on the first abutment surface.

[0017] Furthermore, the upper abutment mechanism includes an upper fixing member, an upper abutment block, and a side top screw;

[0018] The upper fixing component includes a fixed section and a threaded section. The fixed section is fixed to the upper surface of the upper ring platform. The threaded section is provided with a second threaded hole for threaded connection of the side top screw. The upper abutment block has a through groove for receiving part of the threaded section and an insertion hole. The insertion hole communicates with the through groove and is coaxially arranged with the second threaded hole. The upper abutment block has a second abutment surface that abuts against the steel casing. A rubber pad layer is provided on the second abutment surface.

[0019] Furthermore, the angle between the end face of the threaded segment facing away from the fixed segment and the upper surface of the upper ring is an acute angle.

[0020] The above technical solution, by setting an upper and lower ring platform at both ends of the sleeve, and setting an upper and lower abutment mechanism at their corresponding positions, ensures that the steel casing and the steel pipe pile are firmly fixed. At the same time, by setting sealing rings in the first and second slots, the sealing performance of the connection is improved, preventing external media such as mud and seawater from seeping into the pile hole. The sleeve adopts a two-way slot design, which facilitates the quick and efficient connection of the steel casing and the steel pipe pile by inserting the sleeve. It is suitable for drilling construction of steel pipe composite piles in complex near-shore environments, and effectively improves the standardization and efficiency of casing assembly in marine foundation engineering. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the protective sleeve according to an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of the sleeve described in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the sealing ring described in an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the guide block, connecting rod, and lower end abutment block described in an embodiment of the present utility model;

[0026] Figure 5 This is a structural schematic diagram of the lower end fixing member described in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the lower end abutment mechanism described in an embodiment of the present utility model;

[0028] Figure 7 This is a cross-sectional structural diagram of the lower end abutting mechanism and the upper end abutting mechanism described in an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of the upper abutment mechanism described in an embodiment of the present utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Sleeve; 101. First slot; 1011. First limiting cavity; 102. Second slot; 1021. Second limiting cavity; 2. Sealing ring; 201. Contact section; 2011. Embedded annular groove; 202. Transition section; 203. Limiting section; 3. Upper annular platform; 4. Lower annular platform; 401. Through groove; 5. Lower abutment mechanism; 501. Lower fixing component; 5011. Receiving cavity; 5012. Guide groove; 502. Abutment screw; 503. Guide block; 5031. Guide slope; 504. Connecting rod; 505. Lower abutment block; 5051. First abutment surface; 506, threaded cylinder; 507, guide rod; 6, upper abutment mechanism; 601, upper fixing part; 6011, fixing section; 6012, threaded section; 602, upper abutment block; 6021, through groove; 6022, through hole; 6023, second abutment surface; 603, side top screw; 7, limiting part; 701, annular channel; 8, elastic abutment assembly; 801, abutment spring; 802, abutment rod; 803, limiting ring platform; 804, limiting baffle; 805, mounting cylinder; 8051, receiving cavity; 9, steel casing; 10, steel pipe pile. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Regarding steel casings: In the construction of bored pile foundations or steel pipe composite piles, the casing is an indispensable guiding and protective component during the drilling process. Its main functions are as follows: 1. As an initial guiding device for pile hole drilling, the steel casing ensures that the drill bit and drill rod enter the soil vertically and are accurately centered. Especially at sea or in soft strata, the steel casing provides structural guidance, effectively preventing drilling deviation and skewed holes. 2. In soft soil, sandy layers, or water-bearing strata, the steel casing can effectively inhibit the collapse of the strata at the borehole opening and maintain the stability of the upper structure of the pile hole. Its protective role is particularly crucial in the early stages of construction before the mud wall effect is formed. 3. In marine or cofferdam conditions, the steel casing is usually fixed to the working platform by a steel structure or platform. Its upper edge provides rigid support for the drilling rig and guide pipe, ensuring stable equipment operation and improving drilling accuracy. 4. During the later stages of concrete pouring, the steel casing can also provide initial positioning for the guide pipe and form a certain closed boundary, which helps to maintain a consistent pile top elevation and prevent the pile head concrete from turning up or mud from getting mixed in.

[0037] In the specific embodiments provided in this disclosure, a casing for drilling is provided, with reference to... Figures 1 to 8 As shown, the casing includes: a sleeve 1, a sealing ring 2, an upper ring platform 3, a lower ring platform 4, a lower abutment mechanism 5, and an upper abutment mechanism 6. One end of the sleeve 1 is fixedly connected to the upper ring platform 3, and the other end is fixedly connected to the lower ring platform 4. The sleeve 1 has a first slot 101 for inserting the steel casing 9 and a second slot 102 for inserting the steel pipe pile 10. Both the first slot 101 and the second slot 102 are provided with sealing rings 2. The lower abutment mechanism 5 is disposed on the upper surface of the lower ring platform 4 for abutting and fixing the steel pipe pile 10. The upper abutment mechanism 6 is disposed on the upper surface of the upper ring platform 3 for abutting and fixing the steel casing 9.

[0038] The above technical solution effectively solves the problems of cumbersome construction, poor sealing, and unstable structure in the existing connection method between the steel casing 9 and the steel pipe pile 10. Specifically, the sleeve 1 is provided with a first slot 101 and a second slot 102, which are used to insert the steel casing 9 and the steel pipe pile 10, respectively, making the connection method at both ends uniform and standardized, facilitating standardized construction. Sealing rings 2 are provided in both the first slot 101 and the second slot 102 to achieve axial compression during insertion, effectively preventing the infiltration of media such as seawater and mud, improving the sealing and impermeability of the connection. The upper ring platform 3 and the lower ring platform 4 are fixed to both ends of the sleeve 1, forming a rigid limiting platform. Together with the upper abutment mechanism 6 and the lower abutment mechanism 5, they can firmly fix the steel casing 9 and the steel pipe pile 10, ensuring the reliability of their connection.

[0039] In some implementations, reference Figure 2 and Figure 3 As shown, both the inner wall of the first slot 101 and the inner wall of the second slot 102 are provided with limiting members 7 for limiting the sealing ring 2. The sealing ring 2 includes a contact section 201, a transition section 202 and a limiting section 203 that are fixedly connected. The limiting member 7 is provided with an annular channel 701 for the transition section 202 to pass through. A first limiting cavity 1011 for receiving the limiting section 203 is formed between the bottom surface of the first slot 101 and the limiting member 7. A second limiting cavity 1021 for receiving the limiting section 203 is formed between the bottom surface of the second slot 102 and the limiting member 7. The first limiting cavity 1011 and the second limiting cavity 1021 can accurately position and limit the installation of the sealing ring 2, avoid deformation and twisting of the sealing ring 2 during installation, and enhance the structural stability and reliability of the overall sealing system.

[0040] For example, the sealing ring 2 includes a contact section 201, a transition section 202, and a limiting section 203 that are fixed together. The contact section 201 is used to fit the steel pipe pile 10 and / or the steel casing 9 to form an annular circumferential seal. The transition section 202 is used to flexibly connect the contact section 201 and the limiting section 203 to form a buffer transition. The limiting section 203 is located in the first limiting cavity 1011 and / or the second limiting cavity 1021 to ensure that the position of the sealing ring 2 remains stable.

[0041] In some implementations, reference Figure 2 and Figure 3 As shown, the end face of the contact section 201 facing away from the transition section 202 is provided with an embedded annular groove 2011. The cross-section of the embedded annular groove 2011 is trapezoidal or V-shaped. By setting the embedded annular groove 2011 with a specific geometric shape, the contact section 201 can generate a certain elastic deformation when subjected to the axial insertion force of the steel casing 9 or the steel pipe pile 10, thereby enhancing its tightness of contact with the surface of the insert and improving the circumferential sealing performance of the sealing ring 2. Specifically, when the embedded annular groove 2011 has a V-shaped cross-section, the contact section 201 can adaptively deform and embed itself in the tiny gap between the slot and the steel casing 9 or the steel pipe pile 10 under external pressure, effectively resisting the penetration of high-pressure water flow or mud; while the trapezoidal cross-section provides stronger structural support and resilience, preventing the contact section 201 from losing its sealing ability due to long-term compression.

[0042] In some implementations, reference Figures 4 to 7 As shown, the lower end abutment mechanism 5 includes a lower end fixing member 501, an abutment screw 502, a guide block 503, a connecting rod 504, and a lower end abutment block 505; the lower end fixing member 501 is fixedly connected to the upper surface of the lower end ring 4, and the lower end fixing member 501 has a receiving cavity 5011 for receiving the guide block 503. The lower end ring 4 is provided with a through groove 401 communicating with the receiving cavity 5011. The guide block 503 is fixedly connected to the connecting rod 504, and the connecting rod 505... 04 The lower end ring platform 4 is inserted through the through groove 401. The end of the connecting rod 504 away from the guide block 503 is fixedly connected to the lower end abutment block 505. The end of the lower end fixing member 501 away from the sleeve 1 is fixedly connected to the threaded cylinder 506. The threaded cylinder 506 has a first threaded hole for threaded connection to the abutment screw 502. The first threaded hole communicates with the receiving cavity 5011. The abutment screw 502 extends into the receiving cavity 5011 through the first threaded hole and abuts the guide block 503.

[0043] For example, by rotating the abutment screw 502, the abutment screw 502 can pass through the first screw hole provided on the lower end fixing member 501 and gradually extend into the receiving cavity 5011, thereby abutting against the guide block 503 located in the receiving cavity 5011; as the abutment screw 502 pushes inward, the guide block 503 slides along the receiving cavity 5011 and drives the connecting rod 504 fixed thereto to move, so that the lower end abutment block 505 connected to the lower end of the connecting rod 504 moves towards the steel pipe pile 10, and finally the lower end abutment block 505 abuts against the outer wall surface of the steel pipe pile 10. By pressing and fixing the steel pipe pile 10 with the lower end abutment block 505, the connection strength between the steel pipe pile 10 and the sleeve 1 is effectively enhanced, and the stability and anti-disturbance ability between the steel pipe pile 10 and the sleeve 1 are improved.

[0044] In some implementations, reference Figures 4 to 7 As shown, a guide rod 507 is fixedly connected to the guide block 503, and a guide groove 5012 communicating with the receiving cavity 5011 is provided on the lower end fixing member 501. The guide rod 507 is slidably connected to the guide groove 5012. The guide rod 507 slides in the guide groove 5012, making the movement of the guide block 503 in the receiving cavity 5011 more stable. During the rotation of the abutment screw 502, it can ensure that the guide block 503 and its driven connecting rod 504 and lower end abutment block 505 move stably in a direction perpendicular to the axis of the steel pipe pile 10, avoiding problems such as offset, tilting or jamming.

[0045] In some implementations, reference Figures 4 to 7 As shown, the lower fixing member 501 is provided with an elastic abutment component 8; the elastic abutment component 8 includes an abutment spring 801, an abutment rod 802, a limiting ring platform 803, a limiting baffle 804, and a mounting cylinder 805. The mounting cylinder 805 is fixedly connected to the upper surface of the lower fixing member 501 and has a receiving cavity 8051 communicating with the receiving cavity 5011. The limiting ring platform 803 is fixedly connected to the inner wall of the receiving cavity 8051. The limiting ring platform 803 has a through hole for the abutment rod 802 to pass through. A limiting ring platform 803 is provided and extends into the receiving cavity 5011. A limiting baffle 804 is fixedly connected to the abutment rod 802. An abutment spring 801 is sleeved on the outside of the abutment rod 802. One end of the abutment spring 801 abuts against the bottom surface of the receiving cavity 8051 away from the lower fixing member 501, and the other end of the abutment spring 801 abuts against the limiting baffle 804. Thus, under the elastic action, the abutment rod 802 is pushed to move towards the guide block 503, so that the head of the abutment rod 802 abuts against the surface of the guide block 503.

[0046] For example, when no external force is applied, the elastic abutment component 8, through the elastic force of the abutment spring 801, enables the abutment rod 802 to provide a continuous elastic thrust to the guide block 503, thereby improving the stability of the guide block 503 within the receiving cavity 5011. That is, through the elastic force of the abutment spring 801 itself, the abutment rod 802 is continuously pushed downward, providing a stable elastic support force to the guide block 503. Thus, even when the abutment screw 502 is not abutting the guide block 503, the guide block 503 can still maintain a relatively stable position within the receiving cavity 5011, preventing it from shaking or slipping due to gravity or slight disturbances, and providing a good initial state for the subsequent abutment and fixation of the abutment screw 502.

[0047] For example, the abutting rod 802 has an abutting state and an extended state. When the abutting rod 802 is in the abutting state, the limiting ring platform 803 and the limiting baffle 804 are separated from each other, and the abutting spring 801 is in a compressed state. When the abutting rod 802 is in the extended state, the lower surface of the limiting baffle 804 abuts against the upper surface of the limiting ring platform 803, and the abutting spring 801 is in an extended state.

[0048] Meanwhile, the guide block 503 is provided with a guide slope 5031. That is, when the guide block 503 moves toward the abutting rod 802, one end of the abutting rod 802 located in the receiving cavity 5011 gradually contacts the guide slope 5031, thereby causing the abutting rod 802 to gradually move upward. During the movement of the abutting rod 802, the abutting rod 802 switches from the extended state to the abutting state.

[0049] In some implementations, reference Figures 4 to 7 As shown, the lower abutment block 505 has a first abutment surface 5051 for abutting against the steel pipe pile 10. The first abutment surface 5051 is provided with a rubber pad layer. The outer contour of the first abutment surface 5051 is adapted to the outer contour of the steel pipe pile 10. That is, the first abutment surface 5051 can fully contact the steel pipe pile 10. At the same time, the rubber pad layer has a high surface friction coefficient, which can form a stronger friction force between the first abutment surface 5051 and the steel pipe pile 10, thereby enhancing the connection stability between the lower abutment block 505 and the steel pipe pile 10.

[0050] In some implementations, reference Figure 1 , Figure 7 and Figure 8As shown, the upper abutment mechanism 6 includes an upper fixing member 601, an upper abutment block 602, and a side-top screw 603. The upper fixing member 601 includes a fixed section 6011 and a threaded section 6012 that are fixedly connected. The fixed section 6011 is fixedly connected to the upper surface of the upper ring platform 3. The threaded section 6012 is provided with a second threaded hole for threaded connection of the side-top screw 603. The upper abutment block 602 has a through groove 6021 for receiving part of the threaded section 6012 and an insertion hole 6022. The insertion hole 6022 communicates with the through groove 6021 and is coaxially arranged with the second threaded hole so that the side-top screw 603 can pass through the fixing member and press against the abutment block. At the same time, the upper abutment block 602 has a second abutment surface 6023 that abuts against the steel casing 9. A rubber pad layer is provided on the second abutment surface 6023.

[0051] For example, by rotating the side screw 603, a side clamping force can be applied to the upper abutment block 602, so that the second abutment surface 6023 abuts against the outer wall of the steel casing 9, thereby achieving radial limiting clamping and improving the connection reliability between the steel casing 9 and the sleeve 1.

[0052] In some implementations, reference Figure 1 , Figure 7 and Figure 8 As shown, the end face of the threaded section 6012 facing away from the fixed section 6011 forms an acute angle with the upper surface of the upper ring platform 3. Therefore, when the side-top screw 603 is screwed into the second threaded hole and presses against the upper abutment block 602, its force is transmitted to the upper abutment block 602 in a downward-sloping direction. This inclined arrangement allows the side-top screw 603 to exert not only a radial limiting force on the upper abutment block 602, but also a vertical component of force, causing the upper abutment block 602 to more stably adhere to the outer wall surface of the steel casing 9. That is, the side-top screw 603 applies force along the acute angle direction, creating a certain downward pressure trend on the basis of radial clamping, effectively preventing the upper abutment block 602 from sliding or shifting on the surface of the steel casing 9.

[0053] In some embodiments, multiple upper abutment mechanisms 6 are spaced apart on the upper ring platform 3, and multiple lower abutment mechanisms 5 are spaced apart on the lower ring platform 4. By setting multiple upper abutment mechanisms 6 and multiple lower abutment mechanisms 5, the steel casing 9 and the steel pipe pile 10 can be clamped and limited in multiple directions, effectively suppressing their axial displacement and radial sway in the plugged state, and improving the stability and reliability of the overall connection.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A caisson for drilling a borehole, characterized in that include: Sleeve (1), sealing ring (2), upper end ring platform (3), lower end ring platform (4), lower end abutment mechanism (5) and upper end abutment mechanism (6); The sleeve (1) is fixedly connected to the upper ring platform (3) at one end and to the lower ring platform (4) at the other end. The sleeve (1) has a first slot (101) for inserting the steel casing (9) and a second slot (102) for inserting the steel pipe pile (10). The sealing ring (2) is provided in both the first slot (101) and the second slot (102). The lower end abutment mechanism (5) is provided on the upper surface of the lower ring platform (4) for abutting and fixing the steel pipe pile (10). The upper end abutment mechanism (6) is provided on the upper surface of the upper ring platform (3) for abutting and fixing the steel casing (9).

2. A casing for boring according to claim 1, characterised in that: The inner wall of the first slot (101) and the inner wall of the second slot (102) are provided with limiting members (7) for limiting the sealing ring (2). The sealing ring (2) includes a contact section (201), a transition section (202) and a limiting section (203) that are fixedly connected. The limiting member (7) is provided with an annular channel (701) for the transition section (202) to pass through. A first limiting cavity (1011) for receiving the limiting section (203) is formed between the bottom surface of the first slot (101) and the limiting member (7). A second limiting cavity (1021) for receiving the limiting section (203) is formed between the bottom surface of the second slot (102) and the limiting member (7). The contact section (201) is used to abut against the steel pipe pile (10) and / or the steel casing (9).

3. A casing for boring according to claim 2, characterised in that: The contact section (201) has an embedded annular groove (2011) on one end face away from the transition section (202), and the cross-section of the embedded annular groove (2011) is trapezoidal or V-shaped.

4. A casing for boring according to claim 1, characterized in that: The lower end abutment mechanism (5) includes a lower end fixing member (501), an abutment screw (502), a guide block (503), a connecting rod (504), and a lower end abutment block (505); The lower end fixing member (501) is fixedly connected to the upper surface of the lower end ring platform (4). The lower end fixing member (501) has a receiving cavity (5011) for receiving the guide block (503). The lower end ring platform (4) is provided with a through groove (401) communicating with the receiving cavity (5011). The guide block (503) is fixedly connected to the connecting rod (504). The connecting rod (504) passes through the lower end ring platform (4) through the through groove (401). The lower end abutment block (505) is fixedly connected to one end away from the guide block (503). The lower end fixing member (501) is fixedly connected to the threaded cylinder (506) at one end away from the sleeve (1). The threaded cylinder (506) has a first threaded hole for threaded connection of the abutment screw (502). The first threaded hole communicates with the receiving cavity (5011). The abutment screw (502) extends into the receiving cavity (5011) through the first threaded hole and abuts against the guide block (503).

5. A casing for boring according to claim 4, characterised in that: A guide rod (507) is fixedly connected to the guide block (503), and a guide groove (5012) communicating with the storage cavity (5011) is provided on the lower end fixing member (501). The guide rod (507) is slidably connected to the guide groove (5012).

6. A casing for boring according to claim 4, characterised in that: The lower end fixing member (501) is provided with an elastic abutment component (8); The elastic abutment assembly (8) includes an abutment spring (801), an abutment rod (802), a limiting ring platform (803), a limiting baffle (804), and a mounting cylinder (805). The mounting cylinder (805) is fixedly connected to the upper surface of the lower end fixing member (501) and has a receiving cavity (8051) communicating with the receiving cavity (5011). The limiting ring platform (803) is fixedly connected to the inner wall of the receiving cavity (8051), and the limiting ring platform (803) has a through hole for the abutment rod (802) to pass through. The limiting baffle (804) is fixedly connected to the abutting rod (802). The abutting spring (801) is sleeved on the abutting rod (802), and one end of the abutting spring (801) abuts against the bottom surface of the receiving cavity (8051) away from the lower end fixing member (501). The other end of the abutting spring (801) abuts against the limiting baffle (804). The abutting rod (802) can extend through the receiving cavity (8051) into the storage cavity (5011) and abut against the guide block (503).

7. A casing for boring according to claim 6, characterised in that: The abutting rod (802) has an abutting state and an extended state. When the abutting rod (802) is in the abutting state, the limiting ring platform (803) and the limiting baffle (804) are separated from each other. When the abutting rod (802) is in the extended state, the lower surface of the limiting baffle (804) abuts against the upper surface of the limiting ring platform (803). The guide block (503) is provided with a guide ramp (5031).

8. A casing for boring according to claim 4, characterized in that: The lower end abutment block (505) has a first abutment surface (5051) for abutting the steel pipe pile (10), and a rubber pad layer is provided on the first abutment surface (5051).

9. A caisson for boring according to claim 1, characterized in that: The upper end abutting mechanism (6) includes an upper end fixing member (601), an upper end abutting block (602), and a side top screw (603); The upper fixing member (601) includes a fixed section (6011) and a threaded section (6012) that are fixedly connected. The fixed section (6011) is fixedly connected to the upper surface of the upper ring platform (3). The threaded section (6012) is provided with a second threaded hole for threaded connection of the side top screw (603). The upper abutment block (602) has a through groove (6021) for receiving part of the threaded section (6012) and an insertion hole (6022). The insertion hole (6022) communicates with the through groove (6021) and is coaxially arranged with the second threaded hole. The upper abutment block (602) has a second abutment surface (6023) that abuts against the steel casing (9). The second abutment surface (6023) is provided with a rubber pad layer.

10. A casing for boring according to claim 9, characterised in that: The angle between the end face of the threaded section (6012) away from the fixed section (6011) and the upper surface of the upper ring platform (3) is an acute angle.

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