Vertical shaft bottom sealing device and construction method thereof

Abstract

The invention belongs to the technical field of open caisson control, and discloses a vertical shaft bottom sealing device and a construction method, the vertical shaft bottom sealing device is used for sealing the bottom of a shaft, and the vertical shaft bottom sealing device comprises a blade foot ring with a first limiting block and a guide sliding groove and a bottom sealing beam with a second limiting block and a guide piece. A thickening area is arranged on the inner side of a blade foot ring body to form a step, the step provides an inlet for a guide piece, and the guide piece is accurately positioned to the position below a first limiting block through a guide sliding groove; the first limiting block protrudes out of the inner edge of the thickening area and is connected with the second limiting block in an embedded mode to form a stable limiting structure, and deviation caused by lateral force is effectively limited. Therefore, according to the vertical shaft bottom sealing device and the construction method thereof, it can be guaranteed that a heading machine has enough excavation space while it is guaranteed that the thickness of a bottom sealing layer of a deep and large vertical shaft is reduced, the bottom sealing beam and the blade foot ring are easy and convenient to assemble and high in stability, the assembly and construction efficiency can be improved, the construction period is shortened, and the construction cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of caisson control, and in particular to a vertical shaft bottom sealing device and a construction method thereof. Background Art

[0002] The caisson process can be divided into two construction methods, drainage sinking and undrained sinking, depending on whether drainage is used during construction. For deep and large vertical shafts, due to the large depth and inner diameter of the shaft, the undrained sinking method is usually used for construction. In the undrained sinking process, deep and large vertical shafts often require a thicker underwater plain concrete bottom seal to ensure the stability of the shaft structure and the safety of subsequent construction. In some cases, the thickness of the underwater plain concrete sealing layer of deep and large vertical shafts can reach more than 10 meters, which not only significantly increases the construction cost, but also the thick sealing layer is prone to cracks and causes safety hazards such as uneven settlement of the shaft. Therefore, the prior art proposes to effectively reduce the thickness of the bottom seal through the form of reinforced concrete bottom seal beams.

[0003] In order to solve the above problems, the prior art proposes to effectively reduce the thickness of the bottom layer by setting a reinforced concrete bottom beam. In this method, the reinforced concrete bottom beam is usually cast together with the blade ring and sunk with the shaft. However, the above method also has certain limitations. The existence of the reinforced concrete bottom beam will limit the excavation space of the shaft boring machine, thereby affecting the excavation efficiency; if the construction efficiency needs to be maintained under the above conditions, it is necessary to increase the number of boring machines, or design the reinforced concrete bottom beam as a ring beam with a larger cross-sectional size, which significantly increases the construction cost. Summary of the invention

[0004] The object of the present invention is to provide a shaft bottom sealing device and a construction method thereof, which can ensure that the thickness of the sealing layer of a deep and large shaft is reduced without affecting the excavation space of a tunnel boring machine, thereby improving the tunneling efficiency and construction efficiency and saving construction costs.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A shaft bottom sealing device is used to seal the bottom of a shaft, and includes:

[0007] A blade foot ring, the blade foot ring comprises a blade foot ring body, a first limit block and a guide slot, the blade foot ring body is arranged at the bottom of the shaft in the vertical direction, a thickened area is arranged inside the blade foot ring body, the thickened area extends upward from the bottom of the blade foot ring body in the vertical direction, and the inside of the blade foot ring body is a step structure; at least two of the first limit blocks are symmetrically arranged on the upper edge of the thickened area with respect to the central axis of the shaft, the thickened area of ​​each of the first limit blocks radially protrudes from the inner edge of the thickened area, the guide slot is opened on the thickened area on the adjacent side of each of the first limit blocks, the guide slot passes through the upper edge of the thickened area, and extends along the side wall of the thickened area to below the first limit block;

[0008] A bottom beam, the bottom beam comprising a bottom beam body, a second limit block and a guide member, the second limit blocks are respectively provided at both ends of the bottom beam body in the length direction, each second limit block is provided with the guide member at one end away from the bottom beam body, the guide member can slide along the guide groove and finally be positioned below the first limit block, the first limit block and the second limit block can be engaged and connected.

[0009] Furthermore, an engaging groove is formed on a side of the first limiting block facing the second limiting block, the width of the engaging groove gradually decreases from its opening end inward, and the outer contour of the second limiting block matches the shape of the engaging groove.

[0010] Furthermore, the guide slot is inclined from one end passing through the upper edge of the thickened area to one end located below the first limit block, and the slope angle of the guide slot is 15° to 75°.

[0011] Furthermore, the guide member includes a guide wheel and a wheel axle, the wheel axle is embedded in the end of the second limit block away from the bottom beam body, the end of the wheel axle away from the second limit block is rotatably connected to the guide wheel, and the guide wheel can rotate in the guide groove.

[0012] Furthermore, the width and height of the second limit block along the cross-section of the shaft axis are greater than the diameter of the guide wheel. The center of the guide wheel is located on the vertical center axes at both ends of the length direction of the bottom beam body, and is located on the side of the horizontal center axis of the bottom beam body close to the top of the shaft. The total height of the vertical center axis is h, and the distance between the center of the guide wheel and the horizontal center axes at both ends of the length direction of the bottom beam body is h / 10 to h / 6.

[0013] Furthermore, the total length of the bottom beam body, the second limit blocks at both ends and the guide member is greater than the inner diameter of the thickened area, but smaller than the inner diameter of the guide groove; the total length of the bottom beam body and the second limit blocks at both ends is greater than the distance between the two symmetrical first limit blocks, but smaller than the inner diameter of the thickened area; the length of the bottom beam body is smaller than the distance between the two first limit blocks.

[0014] Furthermore, an injection hole penetrating the first limit block is provided along the axial direction of the wellbore.

[0015] Furthermore, the bottom cover beam further comprises at least one hanging rib, and at least one hanging rib is sequentially and spaced apart on the bottom cover beam body along the length direction of the bottom cover beam body.

[0016] Furthermore, the shaft bottom sealing device also includes a real-time monitoring component, which is respectively arranged on both ends of the bottom sealing beam body in the length direction or on each of the first limit blocks.

[0017] A construction method for shaft bottom sealing, wherein the shaft bottom sealing device as described in any one of the above items is used, comprises the following steps:

[0018] S1: Casting the blade foot ring having the first limiting block and the guide groove;

[0019] S2: Casting the bottom beam having the second limit block and the guide member;

[0020] S3: The blade foot ring is pushed into the stratum along the vertical direction, and the tunnel boring machine is used to dig until the shaft reaches the designed depth, and then the tunnel boring machine is taken out;

[0021] S4: hoisting and lowering the cast bottom beam to the position of the blade foot ring, the guide members at both ends of the bottom beam slide along the guide chute, and finally positioned below the first limit block, and the first limit block is engaged with the second limit block;

[0022] S5: Concrete is poured at the bottom of the blade foot ring to seal the bottom of the wellbore. After the bottom sealing strength reaches the design requirement, excess liquid in the wellbore is extracted to complete the bottom sealing.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a shaft bottom sealing device and a construction method thereof, which are used for sealing the bottom of the shaft, and include a blade foot ring with a first limit block and a guide slot, and a bottom sealing beam with a second limit block and a guide member; a step structure is formed by arranging a thickened area on the inner side of the blade foot ring body, and the characteristic that one end of the guide slot passes through the upper edge of the thickened area and extends to the bottom of the first limit block, wherein the step structure provides an entrance for the guide member, so that the guide member can smoothly enter the guide slot from the upper edge of the thickened area, and the guide slot is used to guide the guide member accurately to the bottom of the first limit member; at least two first limit blocks are symmetrically arranged along the central axis of the shaft, and a base is formed by using geometric constraints. The coordination of the first limit block and the guide groove on the adjacent side provides a clear installation reference for the bottom beam, and the guide member slides directly to the bottom of the first limit block through clear direction guidance; each first limit block protrudes from the inner edge of the thickened area, and is engaged with the second limit blocks at both ends of the bottom beam to form a stable limit structure; the protruding first limit block provides an engagement connection point for the second limit block, forming a physical barrier, which shares the shear force and external pressure after being engaged with the second limit block, effectively limiting the displacement or loosening of the bottom beam at the bottom of the wellbore caused by the lateral force, providing multi-directional support for the bottom beam, making the force on the bottom beam more uniform, and keeping it stable under high load. Therefore, the assembly process of the bottom sealing beam and the blade foot ring in a vertical shaft bottom sealing device and its construction method is simple and convenient, with high stability, and can effectively improve the assembly efficiency and construction efficiency. While ensuring that the thickness of the sealing layer of deep and large vertical shafts is reduced, the excavation space of the tunnel boring machine is guaranteed, so that the tunnel boring machine can excavate quickly, improve the excavation efficiency, effectively shorten the construction period, and save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an assembly diagram of the shaft bottom sealing device of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the blade foot ring in the present invention;

[0027] Figure 3 is a top view of the blade foot ring of the present invention;

[0028] Figure 4 The present invention Figure 3 Sectional view of AA in the middle;

[0029] Figure 5 The present invention Figure 3 Cross-sectional view of the middle BB;

[0030] Figure 6 It is a structural schematic diagram of the bottom cover beam in the present invention;

[0031] Figure 7 It is a cross-sectional view of the bottom beam in the present invention.

[0032] In the figure:

[0033] 1. Blade foot ring; 11. Blade foot ring body; 12. First limit block; 13. Fitting groove; 14. Guide slide groove; 15. Thickened area; 16. Injection hole;

[0034] 2. Bottom beam; 21. Bottom beam body; 22. Second limit block; 23. Guide member; 231. Guide wheel; 232. Wheel axle; 24. Hanging rod. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] Please refer to Figures 1 to 7As shown, the present invention provides a shaft bottom sealing device, which can ensure that the thickness of the sealing layer of a deep and large shaft is reduced while not affecting the excavation space of the tunnel boring machine, thereby improving the excavation efficiency and construction efficiency and saving construction costs. The shaft bottom sealing device is used for sealing the bottom of the shaft, and comprises a blade foot ring 1 and a bottom sealing beam 2, wherein the blade foot ring 1 comprises a blade foot ring body 11, a first limit block 12 and a guide slide groove 14, the blade foot ring body 11 is arranged at the bottom of the shaft in the vertical direction, and a thickening area 15 is arranged on the inner side of the blade foot ring body 11, and the thickening area 15 extends upward from the bottom of the blade foot ring body 11 in the vertical direction, and the inner side of the blade foot ring body 11 is a step structure; the upper edge of the thickening area 15 is symmetrically provided with at least two first limit blocks 12 with respect to the central axis of the shaft, and each first limit block 12 protrudes from the inner edge of the thickening area 15 along the radial direction of the thickening area 15, and each first limit block 12 protrudes from the inner edge of the thickening area 15 in the radial direction of the thickening area 15. A guide slot 14 is provided on the thickened area 15 on the adjacent side of the positioning block 12, and the guide slot 14 passes through the upper edge of the thickened area 15 and extends along the side wall of the thickened area 15 to below the first limiting block 12; the bottom beam 2 includes a bottom beam body 21, a second limiting block 22 and a guide member 23, and the second limiting blocks 22 are respectively provided at both ends of the bottom beam body 21 in the length direction, and a guide member 23 is provided at the end of each second limiting block 22 away from the bottom beam body 21, and the guide member 23 can slide along the guide slot 14 and finally be positioned below the first limiting block 12, and the first limiting block 12 and the second limiting block 22 can be engaged and connected.

[0040] By setting a thickened area 15 on the inner side of the blade foot ring body 11 to form a step structure, combined with the characteristic that one end of the guide slot 14 passes through the upper edge of the thickened area 15 and extends to the bottom of the first limit block 12, the step structure provides an entrance for the guide slot 14, which is convenient for the guide member 23 to smoothly enter the guide slot 14 from the upper edge of the thickened area 15, and utilize the guiding effect of the guide slot 14 to accurately guide the guide member 23 to the bottom of the first limit member; at least two first limit blocks 12 are symmetrically arranged along the central axis of the wellbore, and a reference line is formed by geometric constraints. After the symmetrically distributed first limit blocks 12 and the guide slots 14 on the adjacent sides cooperate, a sealing The bottom beam 2 provides a clear installation reference, and the guide member 23 slides directly to the bottom of the first limit block 12 through a clear direction guide; each first limit block 12 protrudes from the inner edge of the thickened area 15, and is connected with the second limit blocks 22 at both ends of the bottom beam 2 to form a stable limit structure. The protruding first limit block 12 provides a connection point for the second limit block 22, forming a physical barrier, and after being connected with the second limit block 22, it shares the shear force and external pressure, effectively limiting the displacement or loosening of the bottom beam 2 at the bottom of the shaft due to the lateral force, providing multi-directional support for the bottom beam 2, making the force of the bottom beam 2 more uniform, so that it remains stable under high load. The bottom beam 2 and the blade foot ring 1 in the shaft bottom sealing device are simple and convenient to assemble, with high stability, which can effectively improve the assembly efficiency and construction efficiency. While ensuring that the thickness of the sealing layer of the deep and large shaft is reduced, the excavation space of the tunnel boring machine is guaranteed, so that the tunnel boring machine can quickly dig, improve the digging efficiency, effectively shorten the construction period, and save construction costs.

[0041] Furthermore, the thickness of the inner edge of the protruding thickened area 15 of the first limiting block 12 is not less than 0.6 meters to ensure the limiting strength of the first limiting block 12 .

[0042] Combination Figure 2 and Figure 5As shown, in order to enhance the stability of the connection between the first limiting block 12 and the second limiting block 22, in some embodiments, the first limiting block 12 is provided with an engaging groove 13 on one side facing the second limiting block 22, the width of the engaging groove 13 gradually decreases from its open end inward, and the outer contour of the second limiting block 22 matches the shape of the engaging groove 13; by designing that the width of the engaging groove 13 gradually decreases from its open end inward, a self-locking structure is formed, the bite force between the first limiting block 12 and the second limiting block 22 is enhanced, a strong limiting effect is provided, and it is ensured that the second limiting block 22 is not easily separated due to external force or vibration after insertion, thereby improving the stability of the connection of the shaft bottom sealing device; by the design of matching the shape of the engaging groove 13 with the second limiting block 22, a precisely matched engaging structure can be achieved, so that the positioning is accurate during the assembly process, the operation is more convenient, and the gap that may exist between the internal structures of the shaft bottom sealing device is effectively reduced, thereby preventing the infiltration of external media (such as mud or water). Among them, the shape of the engaging groove 13 can be but not limited to a trapezoidal shape, which is not specifically limited here.

[0043] Continue to combine Figure 2 and Figure 5 As shown, in order to further improve the guiding function of the guide slot 14, in some embodiments, the guide slot 14 is inclined from one end passing through the upper edge of the thickened area 15 to one end located below the first limit block 12, and the slope angle of the guide slot 14 is 15° to 75°; wherein, the guide slot 14 is inclined at a certain slope from one end passing through the upper edge of the thickened area 15 to one end located below the first limit block 12, and the gravity of the bottom beam 2 is utilized to accelerate the guide member 23 from sliding into the designated position of the guide slot 14, thereby reducing the difficulty of manual alignment and improving assembly efficiency. At the same time, a clear guiding path is also provided for the guide member 23, thereby effectively preventing the guide member 23 from deflecting or getting stuck during movement. The setting of the slope makes the sliding process of the guide member 23 smoother and more stable; the slope angle range is set to 15° to 75°, which can adapt to different working conditions. For example, a smaller slope is suitable for slow sliding to maintain precise positioning, while a larger slope is suitable for rapid guidance to improve work efficiency; specifically, the slope angle can be but is not limited to being set to 30° or 45°, which is not specifically limited here and can be adjusted according to actual construction needs.

[0044] like Figure 7As shown, in order to make the process of the guide member 23 sliding into the specified position of the guide slot 14 smoother, in some embodiments, the guide member 23 includes a guide wheel 231 and a wheel axle 232, and the end of the second limit block 22 away from the bottom beam body 21 is embedded with a wheel axle 232, and the end of the wheel axle 232 away from the second limit block 22 is rotatably connected with the guide wheel 231, and the guide wheel 231 can rotate in the guide slot 14; wherein the guide wheel 231 is connected to the end of the second limit block 22 away from the bottom beam body 21 through the wheel axle 232, the guide wheel 231 is rotatably connected to the wheel axle 232, and the guide wheel 231 can rotate in the guide slot 14, and the design of the guide wheel 231 can significantly reduce the friction resistance between the guide member 23 and the surface of the guide slot 14, so that the guide member 23 can move more smoothly and smoothly along the guide slot 14, avoiding friction or jamming between the two, and improving assembly efficiency.

[0045] Combination Figure 1 and Figure 6 As shown, if the size of the second limit block 22 is smaller than the diameter of the guide wheel 231, when the guide wheel 231 moves in the limit slide groove, the second limit block 22 may be offset from the interlocking groove 13 of the first limit block 12, thereby destroying the interlocking relationship. To solve the above problem, in some embodiments, the width and height of the cross section of the second limit block 22 along the shaft axis are both larger than the diameter of the guide wheel 231, and the center of the guide wheel 231 is located on the vertical center axis at both ends of the length direction of the bottom beam body 21, and is located on the side of the horizontal center axis of the bottom beam body 21 close to the top of the shaft, the total height of the vertical center axis is h, and the distance between the center of the guide wheel 231 and the horizontal center axis of the bottom beam body 21 is h / 10~h / 6; by increasing the size of the second limit block 22 After the size is designed to be larger than the diameter of the guide wheel 231, even if the guide wheel 231 is displaced in a small range at the bottom of the guide slot 14, the first limit block 12 and the second limit block 22 can still be kept in an engaged state to prevent the device from loosening or failing; in addition, when the bottom beam 2 slides in the guide slot 14, the center position of the guide wheel 231 will directly affect the symmetry of the overall force of the bottom beam 2. The center height of the guide wheel 231 is set to be located on the side of the horizontal center axis of the bottom beam body 21 close to the top of the shaft, and the distance from the horizontal center axis of the bottom beam body 21 is h / 10 to h / 6, so that it is closer to the center of gravity, optimizes the distribution of gravity and guide force, and effectively prevents the bottom beam 2 from tilting during movement, making the device more stable.

[0046] like Figure 1As shown, in some embodiments, the total length of the bottom beam body 21, the second limit blocks 22 at both ends thereof and the guide member 23 is greater than the inner diameter of the thickened area 15, but less than the inner diameter of the guide slot 14; the total length of the bottom beam body 21 and the second limit blocks 22 at both ends thereof is greater than the distance between the two symmetrical first limit blocks 12, but less than the inner diameter of the thickened area 15; the length of the bottom beam body 21 is less than the distance between the two first limit blocks 12; wherein, the total length of the bottom beam 2 is greater than the inner diameter of the thickened area 15 but less than the inner diameter of the guide slot 14, ensuring that the guide member 23 can slide smoothly in the guide slot 14 without being blocked or loosened due to insufficient or excessive size, and the guide member 23 can fully contact the inner wall of the guide slot 14 so that it can slide in the guide slot 1 4, which can maintain smooth movement and obtain good support in the guide slot 14, thereby improving the guiding accuracy and enabling the bottom beam 2 to slide accurately along the predetermined path; the total length of the bottom beam body 21 and the second limit block 22 is greater than the distance between the two first limit blocks 12, so that it always maintains an interlocking relationship with the first limit block 12 during movement, ensuring that the bottom beam 2 moves in a controlled manner under the action of the first limit block 12, preventing it from escaping from the limit structure due to insufficient size, and improving safety; the length of the bottom beam body 21 is less than the distance between the two first limit blocks 12, so that a certain movement gap can be left between the bottom beam body 21 and the first limit block 12 to avoid friction and jamming caused by excessive interlocking.

[0047] Combination Figure 3 and Figure 4 As shown, in some embodiments, an injection hole 16 is provided on the first limit block 12 along the axial direction of the shaft, wherein the construction personnel can, after the bottom sealing beam 2 and the blade foot ring 1 are assembled, inject water into the injection hole 16 at high pressure, and use the high-pressure water flow to wash away the silt and sediment attached between the first limit block 12 and the second limit block 22, and then inject cement mortar into the injection hole 16 at high pressure to seal the bottom of the shaft; by injecting high-pressure water flow into the injection hole 16, the contact surface between the first limit block 12 and the second limit block 22 can be kept clean, and impurities can be prevented from affecting the fixation of the two. After cleaning, continuing to inject cement mortar through the injection hole 16 can help the cement mortar to be evenly injected into the bottom sealing area of ​​the shaft to form an effective sealing layer, and the cleaning and grouting operations are realized through the injection hole 16, so that the construction personnel do not need to perform additional tedious cleaning work. It can be understood that setting the injection hole 16 at the center position of the first limit block 12 can ensure that when water or cement mortar is injected into the injection hole 16, the liquid can be evenly distributed around the first limit block 12 and the second limit block 22, which helps to improve the injection effect and avoid excessive local pressure or uneven liquid flow.

[0048] like Figure 6As shown, in order to facilitate hoisting, in some embodiments, the bottom beam 2 also includes at least one hanging rod 24, and at least one hanging rod 24 is arranged on the bottom beam body 21 at intervals along the length direction of the bottom beam body 21; through the arrangement of the hanging rod 24, the construction personnel can more efficiently and safely hoist the bottom beam 2 from the ground to the specified position of the blade foot ring 1, thereby improving the convenience of the hoisting operation, wherein the number of the hanging rods 24 can be but is not limited to 2, 3, etc., which is not specifically determined here; if the number of the hanging rods 24 is set to 2, the two hanging rods 24 can be symmetrically arranged along the central axis of the bottom beam body 21 to ensure that the bottom beam 2 is evenly stressed during hoisting, thereby ensuring the stability of the hoisting process.

[0049] In order to ensure that the bottom beam 2 is accurately connected to the blade foot ring 1, in some embodiments, the shaft bottom sealing device also includes a real-time monitoring component, which is respectively arranged at both ends of the length direction of the bottom beam body 21 or on each first limit block 12, wherein the real-time monitoring component can provide real-time data through sensors and other equipment to help construction personnel track the relative position between the bottom beam 2 and the blade foot ring 1 in real time, ensuring that their docking process meets the design requirements. If deviations or misalignments are found during the docking process between the bottom beam 2 and the blade foot ring 1, adjustments can be made in time, reducing structural problems caused by assembly errors. Among them, the real-time monitoring component can be, but is not limited to, a waterproof surveillance camera, which is not specifically limited here.

[0050] The present invention also provides a construction method for shaft bottom sealing, using the shaft bottom sealing device in any of the above embodiments, comprising the following steps:

[0051] S1: Casting a blade foot ring 1 having a first limit block 12 and a guide slot 14;

[0052] S2: Casting the bottom beam 2 having the second limit block 22 and the guide member 23;

[0053] S3: The blade foot ring 1 is pushed into the stratum along the vertical direction, and the tunnel boring machine is used to dig until the shaft reaches the designed depth, and then the tunnel boring machine is removed;

[0054] S4: The cast bottom beam 2 is hoisted and lowered to the position of the blade foot ring 1, and the guide members 23 at both ends of the bottom beam 2 slide along the guide chute 14 and finally positioned below the first limit block 12, and the first limit block 12 is engaged with the second limit block 22;

[0055] S5: Pour concrete at the bottom of the blade foot ring 1 to seal the bottom of the wellbore. After the bottom sealing strength reaches the design requirement, extract the excess liquid inside the wellbore to complete the bottom sealing.

[0056] The construction method of the bottom sealing of the vertical shaft is to first use a tunnel boring machine to excavate the bottom of the shaft, and after the shaft reaches the designed depth, the bottom sealing beam 2 is assembled on the blade foot ring 1 to seal the bottom of the shaft. While ensuring that the thickness of the sealing layer of the deep and large shaft is reduced, it can ensure that the tunnel boring machine has sufficient excavation space. The assembly process of the bottom sealing beam 2 and the blade foot ring 1 is simple and stable, which can improve the assembly and construction efficiency, shorten the construction period and save construction costs.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A shaft bottom sealing device, used for sealing the bottom of a shaft, characterized in that: include: A blade foot ring (1), the blade foot ring (1) comprising a blade foot ring body (11), a first limit block (12) and a guide slot (14), the blade foot ring body (11) being arranged at the bottom of the wellbore in a vertical direction, a thickened area (15) being arranged on the inner side of the blade foot ring body (11), the thickened area (15) extending upward from the bottom of the blade foot ring body (11) in a vertical direction, and the inner side of the blade foot ring body (11) being a step structure; the upper edge of the thickened area (15) is provided with the At least two first stop blocks (12) are symmetrically arranged on the central axis of the wellbore, each of the first stop blocks (12) protrudes from the inner edge of the thickened area (15) along the radial direction of the thickened area (15), and the thickened area (15) adjacent to each first stop block (12) is provided with a guide slot (14), the guide slot (14) passes through the upper edge of the thickened area (15), and extends along the side wall of the thickened area (15) to below the first stop block (12); A bottom cover beam (2), the bottom cover beam (2) comprising a bottom cover beam body (21), a second limit block (22) and a guide member (23), the second limit blocks (22) being respectively arranged at both ends of the bottom cover beam body (21) in the length direction, the guide member (23) being arranged at one end of each second limit block (22) away from the bottom cover beam body (21), the guide member (23) being able to slide along the guide slide groove (14) and finally being positioned below the first limit block (12), the first limit block (12) being engaged with the second limit block (22).

2. The shaft bottom sealing device according to claim 1, characterized in that: A fitting groove (13) is provided on a side of the first limiting block (12) facing the second limiting block (22), the width of the fitting groove (13) gradually decreases from its opening end inwards, and the outer contour of the second limiting block (22) matches the shape of the fitting groove (13).

3. The shaft bottom sealing device according to claim 1, characterized in that: The guide slot (14) is inclined from one end passing through the upper edge of the thickened area (15) to one end located below the first limit block (12), and the slope angle of the guide slot (14) is 15° to 75°.

4. The shaft bottom sealing device according to claim 1, characterized in that: The guide member (23) comprises a guide wheel (231) and a wheel axle (232); the wheel axle (232) is embedded in one end of the second limit block (22) away from the bottom beam body (21); the wheel axle (232) is rotatably connected to one end of the wheel axle (232) away from the second limit block (22); and the guide wheel (231) is capable of rotating in the guide slot (14).

5. The shaft bottom sealing device according to claim 4, characterized in that: The width and height of the cross section of the second limit block (22) along the shaft axis are both greater than the diameter of the guide wheel (231); the center of the guide wheel (231) is located on the vertical center axis at both ends of the length direction of the bottom beam body (21), and is located on the side of the horizontal center axis of the bottom beam body (21) close to the top of the shaft; the total height of the vertical center axis is h, and the distance between the center of the guide wheel (231) and the horizontal center axis of the bottom beam body (21) is h / 10 to h / 6.

6. The shaft bottom sealing device according to claim 5, characterized in that: The total length of the bottom beam body (21), the second limit blocks (22) at both ends thereof, and the guide member (23) is greater than the inner diameter of the thickened area (15), but less than the inner diameter of the guide slot (14); the total length of the bottom beam body (21) and the second limit blocks (22) at both ends thereof is greater than the distance between the two symmetrical first limit blocks (12), but less than the inner diameter of the thickened area (15); the length of the bottom beam body (21) is less than the distance between the two first limit blocks (12).

7. The shaft bottom sealing device according to any one of claims 1 to 6, characterized in that: The first limiting block (12) is provided with an injection hole (16) extending through the wellbore in the axial direction.

8. The shaft bottom sealing device according to any one of claims 1 to 6, characterized in that: The bottom cover beam (2) further comprises at least one hanging rib (24), wherein at least one hanging rib (24) is sequentially arranged on the bottom cover beam body (21) at intervals along the length direction of the bottom cover beam body (21).

9. The shaft bottom sealing device according to any one of claims 1 to 6, characterized in that: The shaft bottom sealing device also includes a real-time monitoring component, which is respectively arranged on both ends of the bottom sealing beam body (21) in the length direction or on each of the first limit blocks (12).

10. A construction method for sealing the bottom of a shaft, characterized in that: The shaft bottom sealing device according to any one of claims 1 to 9 comprises the following steps: S1: Casting the blade foot ring (1) having the first limiting block (12) and the guide groove (14); S2: Casting the bottom beam (2) having the second limiting block (22) and the guide member (23); S3: Pushing the blade foot ring (1) vertically into the ground, using a tunnel boring machine to dig until the shaft reaches the designed depth, and then removing the tunnel boring machine; S4: The cast bottom beam (2) is hoisted and lowered to the position of the blade foot ring (1), and the guide members (23) at both ends of the bottom beam (2) slide along the guide slide groove (14) and are finally positioned below the first limit block (12), and the first limit block (12) is engaged and connected with the second limit block (22); S5: Concrete is poured onto the bottom of the blade foot ring (1) to seal the bottom of the shaft. After the strength of the bottom seal reaches the design requirement, excess liquid inside the shaft is extracted to complete the bottom seal.

Images