Tunneling and bottom sealing method for super-large-section vertical shaft

Abstract

The invention belongs to the technical field of open caisson control, and discloses a tunneling and bottom sealing method for a super-large-section vertical shaft, a first tunneling machine is adopted for tunneling an outer ring area of the bottom of the shaft along a sliding rail, a second tunneling machine is adopted for rotatably tunneling an inner ring area around the central axis of a rotary disc, the tunneling range is effectively expanded, and the construction requirement of the super-large-section vertical shaft is met; wherein the ring beam is pre-embedded around the upper part of the inner wall of the blade foot to support the arrangement of the slide rail and ensure the stable operation of the first heading machine; the working radius of the central operation platform is adjusted through the telescopic second heading machine so as to adapt to heading areas of different sizes, and the supporting legs can be stably clamped to the ring beam to maintain the stability of the central operation platform; according to the area ratio of the inner ring area to the outer ring area, the tunneling speed of the first tunneling machine and the second tunneling machine is adjusted, and the excavation consistency is guaranteed; the brush arm machine slides along the sliding rail and drives the brush head to be attached to the side wall of the blade foot for cleaning, it is ensured that no impurity is attached to the side wall of the blade foot, and structural hidden dangers caused by local weakness of the back cover are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of caisson control, and in particular to a method for excavating and sealing the bottom of a vertical shaft with a super-large cross-section. Background Art

[0002] At present, in order to meet the excavation needs of shafts with larger diameters, an operating platform is usually set up in the center of the shaft, and a rotary excavation arm is installed in the center of the platform for excavation operations. The central operating platform is connected to the inside of the shaft through legs, and the length of the legs can be adjusted to adapt to shafts of different diameters.

[0003] However, when the shaft diameter exceeds 30 meters (usually called a super-large section shaft), the central operating platform is limited by the telescopic range of the rotary tunneling arm, and its maximum tunneling diameter cannot meet the construction needs of the super-large section shaft. In addition, during the excavation of the super-large section shaft, the excavation is carried out only by the central operating platform, and the excavation efficiency is low. In addition, super-large section shafts usually require a thicker underwater concrete bottom seal to balance the formation water pressure, but due to the telescopic excavation method of the rotary tunneling arm, there are excavation dead angles, especially the position of the blade foot side wall cannot clean the soil; if it is in a soft soil layer, the soil often adheres to the blade foot side wall. At this time, after the bottom seal is poured, it is easy to form a local weak area, resulting in the formation of a seepage channel, which in turn affects the safety of the super-large section shaft structure. Summary of the invention

[0004] The purpose of the present invention is to provide a method for excavating and sealing the bottom of a super-large cross-section vertical shaft, which can break through the operating limitations of a traditional rotary excavation arm, meet the construction requirements of super-large cross-section vertical shafts, improve excavation efficiency and bottom sealing quality, and avoid structural hazards caused by local weakness of the bottom sealing.

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

[0006] A method for excavating and sealing the bottom of a super-large-section vertical shaft, wherein the super-large-section vertical shaft comprises a shaft and a blade foot, wherein the method for excavating and sealing the bottom of a super-large-section vertical shaft comprises the following steps:

[0007] S1: The blade foot is installed at the bottom of the shaft, and a pre-buried ring beam is arranged at the upper end of the inner wall of the blade foot along the circumference of the shaft, and a slide rail is arranged on the ring beam, and the first tunneling machine is detachably installed on the slide rail;

[0008] S2: hoisting the central operating platform into the interior of the super-large cross-section shaft; the central operating platform comprises supporting legs, a rotary table and a retractable second roadheader, the supporting legs are evenly spaced along the circumference of the rotary table and are clamped with the ring beam, and the second roadheader is connected to the output end of the rotary table;

[0009] S3: the shaft is pushed vertically into the ground, the first roadheader slides on the slide rail along the side wall of the blade foot to excavate the outer ring area at the bottom of the shaft; the second roadheader rotates around the central axis of the rotary table to excavate the inner ring area of ​​the shaft; the excavation speeds of the first roadheader and the second roadheader are set according to the ratio of the area of ​​the outer ring area to the area of ​​the inner ring area to keep the excavation completion progress of the inner ring area the same as that of the outer ring area, until the excavation reaches the designed depth of the shaft, and then the first roadheader and the central operating platform are dismantled and recovered;

[0010] S4: The brush arm machine is detachably mounted on the slide rail and slides along the side wall of the blade foot. The brush arm machine comprises a brush head, a brush arm and a first driving member. The brush arm is connected to the output end of the first driving member, and the brush head is connected to the brush arm. The first driving member drives the brush arm to drive the brush head to move up and down along the shaft axis. The brush head adheres to the side wall of the blade foot and cleans its surface until the cleaning meets the standard, and the brush arm machine is dismantled and recovered.

[0011] S5: pouring bottom sealing concrete to complete the bottom sealing construction of the super-large section shaft.

[0012] Furthermore, the bottom surface of the ring beam is set to be a concave-convex surface.

[0013] Furthermore, a water stop strip is arranged around the concave-convex surface.

[0014] Furthermore, a plurality of the first tunneling machines are installed in the super-large cross-section shaft, and each of the first tunneling machines is installed on the slide rail and located between adjacent supporting legs.

[0015] Furthermore, the first tunneling machine includes a first tunneling arm, a rotating member and a second driving member. The first tunneling arm is connected to the output end of the second driving member. The second driving member can drive the first tunneling arm to tunnel along the axis direction of the first tunneling arm. The rotating member connects the second driving member and the first tunneling arm. The rotating member can drive the first tunneling arm to rotate a certain angle around the axis of the first tunneling arm.

[0016] Furthermore, the first tunneling machine and / or the second tunneling machine is provided with a plurality of replaceable cutting parts.

[0017] Furthermore, each of the cutting elements is provided with a displacement sensor for monitoring the displacement of the cutting element.

[0018] Furthermore, the arm brush machine also includes a high-pressure nozzle, and the high-pressure nozzle is arranged on the brush head.

[0019] Furthermore, the brush head and the high-pressure nozzle are both detachably connected to the brush arm.

[0020] Furthermore, a third driving member is provided on the slide rail, one end of which can slide along the slide rail, and the other end of the third driving member is detachably connected to the first tunnel boring machine or the brush arm machine to facilitate driving the first tunnel boring machine or the brush arm machine to slide along the slide rail.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a method for excavating and sealing the bottom of a super-large cross-section vertical shaft. By sliding a first tunnel boring machine on a slide rail along the side wall of a blade foot to excavate the outer ring area at the bottom of the shaft, and rotating a second tunnel boring machine around the central axis of a turntable to excavate the inner ring area of ​​the shaft, the excavation range can be effectively expanded to meet the construction needs of super-large cross-section vertical shafts. A ring beam is pre-embedded in the upper part of the inner wall of the blade foot to enhance the overall stability of the shaft structure. The slide rail is arranged based on the ring beam to provide stable guiding support for the first tunnel boring machine, ensuring that the first tunnel boring machine runs smoothly and has a precise path. The retractable tunnel boring machine in the central operating platform can adapt to the excavation needs of different diameters or areas inside the shaft by adjusting the operating radius. The supporting legs evenly distributed along the circumference of the turntable can provide stable support for the central operating platform, ensuring that the central operating platform can be safely and stably connected to the ring beam and suspended in the shaft. inside; at the same time, the excavation speeds of the first tunnel boring machine and the second tunnel boring machine are set according to the ratio of the area of ​​the outer circle area to the area of ​​the inner circle area, so as to keep the excavation speed of the inner circle area the same as the excavation completion progress of the outer circle area, which can effectively prevent the construction delay in a certain area and avoid the imbalance or stress concentration of the local supporting structure caused by uneven construction progress, effectively reduce the risk of collapse or deformation, and improve the overall stability and safety; the brush arm machine is detachably installed on the slide rail and slides along the side wall of the blade foot. The first driving member drives the brush arm to drive the brush head to move up and down along the axial direction of the wellbore. The brush head fits against the side wall of the blade foot, and can perform comprehensive and automatic cleaning of the side wall of the blade foot to ensure that there is no impurity attachment on the surface of the blade foot before concrete pouring. The cleaning path is precisely controllable to ensure uniform cleaning without leaving blind spots, effectively avoid the formation of seepage channels due to local weak areas, and improve the stability of the combination of the bottom sealing concrete and the structure. The excavation and bottom sealing method of super-large section shafts has achieved high efficiency, safety and high quality of excavation and bottom sealing construction of super-large section shafts through the design of mechanized and automated construction processes, breaking through the limitations of traditional technology, significantly improving construction efficiency and avoiding structural risks caused by local weakness of the bottom seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view of the super-large cross-section vertical shaft excavation device of the present invention;

[0024] Figure 2 The present invention Figure 1 Sectional view of AA in the middle;

[0025] Figure 3 It is an assembly diagram of the super-large cross-section vertical shaft and the brush arm machine in the present invention.

[0026] In the figure:

[0027] 100. Shaft; 200. Blade foot;

[0028] 1. Ring beam; 11. Concave and convex surface; 2. Slide rail; 3. First tunneling machine; 31. First tunneling arm; 4. Central operating platform; 41. Support leg; 42. Turntable; 43. Second tunneling machine; 5. Brush arm machine; 51. Brush head; 52. Brush arm; 53. First driving member; 6. Third driving member. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Please refer to Figures 1 to 3 As shown, the present invention provides a method for excavating and sealing the bottom of a super-large cross-section vertical shaft, which can break through the operating limitations of a traditional rotary excavation arm, meet the construction requirements of a super-large cross-section vertical shaft, improve excavation efficiency and bottom sealing quality, and avoid structural hazards caused by local weakness of the bottom sealing. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft, the super-large cross-section vertical shaft includes a shaft 100 and a blade foot 200, wherein the method for excavating and sealing the bottom of a super-large cross-section vertical shaft includes the following steps:

[0034] S1: The blade foot 200 is installed at the bottom of the shaft 100, and a pre-buried ring beam 1 is arranged around the upper end of the inner wall of the blade foot 200 along the circumference of the shaft 100, and a slide rail 2 is arranged on the ring beam 1, and the first tunneling machine 3 is detachably installed on the slide rail 2;

[0035] S2: hoisting the central operating platform 4 into the interior of the super-large cross-section shaft; the central operating platform 4 comprises a support leg 41, a rotary table 42 and a retractable second roadheader 43, the support leg 41 is evenly spaced along the circumference of the rotary table 42 and is clamped with the ring beam 1, and the second roadheader 43 is connected to the output end of the rotary table 42;

[0036] S3: The shaft 100 is pushed vertically into the stratum, and the first roadheader 3 slides on the slide rail 2 along the side wall of the blade foot 200 to excavate the outer circle area at the bottom of the shaft 100; the second roadheader 43 rotates around the central axis of the rotary disk 42 to excavate the inner circle area of ​​the shaft 100; the excavation speeds of the first roadheader 3 and the second roadheader 43 are set according to the ratio of the area of ​​the outer circle area to the area of ​​the inner circle area, so as to keep the excavation completion progress of the inner circle area the same as that of the outer circle area, until the excavation reaches the designed depth of the shaft 100, and then the first roadheader 3 and the central operating platform 4 are dismantled and recovered;

[0037] S4: The brush arm machine 5 is detachably mounted on the slide rail 2 and slides along the side wall of the blade foot 200. The brush arm machine 5 includes a brush head 51, a brush arm 52 and a first driving member 53. The brush arm 52 is connected to the output end of the first driving member 53. The brush head 51 is connected to the brush arm 52. The first driving member 53 drives the brush arm 52 to drive the brush head 51 to move up and down along the shaft 100. The brush head 51 is attached to the side wall of the blade foot 200 and cleans its surface. After the cleaning is up to standard, the brush arm machine 5 is dismantled and recovered.

[0038] S5: Pour bottom concrete to complete the bottom construction of the super-large section shaft.

[0039] In the extra-large cross-section vertical shaft, the maximum range that the second tunnel boring machine 43 in the central operating platform 4 can dig is the inner circle area, and the part outside the inner circle area is the outer circle area, where the sum of the areas of the inner circle area and the outer circle area together constitutes the overall area of ​​the bottom of the shaft 100.

[0040] By sliding the first tunnel boring machine 3 on the slide rail 2 along the side wall of the blade foot 200 to excavate the outer ring area at the bottom of the shaft 100, and rotating the second tunnel boring machine 43 around the central axis of the turntable 42 to excavate the inner ring area of ​​the shaft 100, the excavation range can be effectively expanded to meet the construction requirements of super-large cross-section vertical shafts; wherein, the ring beam 1 is pre-buried around the upper part of the inner wall of the blade foot 200, thereby enhancing the overall stability of the shaft 100 structure, and the slide rail 2 is arranged based on the ring beam 1 to provide stable guiding support for the first tunnel boring machine 3, ensuring that the first tunnel boring machine 3 runs smoothly and the path is accurate; the retractable tunnel boring machine in the central operating platform 4 can adapt to the excavation requirements of different diameters or areas inside the shaft 100 by adjusting the operating radius; the support legs 41 evenly distributed along the circumference of the turntable 42 can provide stable support for the central operating platform 4, ensuring that the central operating platform 4 can be safely and stably connected to the ring beam 1 and suspended in the shaft 100; at the same time, according to the area of ​​the outer ring area The excavation speeds of the first tunnel boring machine 3 and the second tunnel boring machine 43 are set according to the ratio of the area of ​​the inner circle area to the area of ​​the inner circle area, so as to keep the excavation speed of the inner circle area the same as the excavation completion progress of the outer circle area, which can effectively prevent the construction of a certain area from lagging behind, ensure the consistency of excavation in each area, avoid the imbalance of the local supporting structure or stress concentration caused by uneven construction progress, effectively reduce the risk of collapse or deformation, and improve the overall stability and safety; the brush arm machine 5 is detachably mounted on the slide rail 2 and slides along the side wall of the blade foot 200, and the first driving member 53 drives the brush arm 52 to drive the brush head 51 to move up and down along the axis of the wellbore 100. The brush head 51 fits with the side wall of the blade foot 200, and can perform comprehensive and automatic cleaning of the side wall of the blade foot 200, ensuring that there is no impurity attachment on the surface of the blade foot 200 before concrete pouring. The cleaning path is precisely controllable, ensuring uniform cleaning without leaving blind spots, effectively avoiding the formation of seepage channels due to local weak areas, and improving the stability of the combination of the bottom sealing concrete and the structure. The excavation and bottom sealing method of super-large section shafts has achieved high efficiency, safety and high quality of excavation and bottom sealing construction of super-large section shafts through the design of mechanized and automated construction processes, breaking through the limitations of traditional technology, significantly improving construction efficiency and avoiding structural risks caused by local weakness of the bottom seal.

[0041] It is understandable that a slot can be provided on the ring beam 1 at a position corresponding to the support leg 41, and the end of the support leg 41 is set to a shape matching the slot, and the two are connected by insertion. Alternatively, an elastic buckle structure is provided on the ring beam 1, and after the support leg 41 is inserted into the buckle structure, the buckle structure is automatically locked to achieve the connection between the two. Furthermore, the number of the support legs 41 can be set to 2, 3, 4 or 5, etc., which is not specifically limited here.

[0042] In other embodiments, the central operating platform 4 also includes a slewing support structure, which is arranged between the turntable 42 and the second tunnel boring machine 43, wherein the slewing support structure can provide stable rotational support for the second tunnel boring machine 43, reduce vibration and shaking during rotation, and enable the second tunnel boring machine 43 to rotate smoothly around the central axis of the turntable 42.

[0043] like Figure 3 As shown, in order to enhance the anti-seepage performance of the ring beam 1, in some embodiments, the bottom surface of the ring beam 1 is set as a concave-convex surface 11, wherein the irregularity of the concave-convex surface 11 is used to form more contact points or "gullies" between the bottom surface of the ring beam 1 and the concrete, thereby increasing the actual contact area between the two, forcing the water flow to bypass these concave-convex parts, increasing the complexity of the contact between the liquid and the solid, and significantly extending the water seepage path, thereby slowing down the water seepage speed and enhancing the anti-seepage performance of the contact part between the ring beam 1 and the concrete. Furthermore, a waterstop is arranged on the concave-convex surface 11, and the waterstop can effectively prevent water from penetrating along the contact surface between the ring beam 1 and the concrete. The waterstop is arranged on the concave-convex surface 11, and the waterstop can be in close contact with the concrete surface and play a more efficient sealing role. The concave-convex surface 11 itself can increase the contact area, and the waterstop further strengthens this effect and improves the sealing performance. It is understandable that the waterstop can be made of a material with elasticity and sealing properties, which can fill the gaps on the concave and convex surfaces and reduce the path for water to penetrate along the surface; specifically, the waterstop can be made of but not limited to silicone materials or rubber materials, etc., and no specific limitation is made here.

[0044] like Figure 1 As shown, in order to improve the excavation efficiency of the outer circle area, in some embodiments, a plurality of first tunneling machines 3 are installed in the super-large section shaft, and each first tunneling machine 3 is installed on the slide rail 2 and is located between adjacent supporting legs 41; through the parallel operation of the plurality of first tunneling machines 3, the plurality of first tunneling machines 3 are distributed between adjacent supporting legs 41, so that multiple areas can be excavated at the same time, and the coordinated operation of the plurality of first tunneling machines 3 reduces the burden of a single tunneling machine, significantly improves the excavation speed, and evenly shares the force and load generated during the excavation process.

[0045] In order to expand the excavation range, in some embodiments, the first tunneling machine 3 includes a first tunneling arm 31, a rotating member and a second driving member. The first tunneling arm 31 is connected to the output end of the second driving member, and the second driving member can drive the first tunneling arm 31 to excavate along the axis direction of the first tunneling arm 31. The rotating member connects the second driving member and the first tunneling arm 31, and the rotating member can drive the first tunneling arm 31 to rotate a certain angle around the axis of the first tunneling machine 3; wherein, the first tunneling arm 31 can be driven by the rotating member to provide an additional rotation angle around its axis, so that the first tunneling machine 3 can flexibly adjust the excavation angle and range, improve the flexibility and accuracy of the first tunneling machine 3, avoid the limitation of excavation in a single fixed direction, not only ensure that the soil under the support foot 41 can be fully excavated, but also reduce the excavation dead angle to expand the excavation range, and at the same time enable the first tunneling arm 31 to avoid the risk of possible interference with the support foot 41.

[0046] In order to adapt to different geological conditions, in some embodiments, the first tunnel boring machine 3 and / or the second tunnel boring machine 43 are provided with a plurality of replaceable cutting parts; wherein, the replaceable cutting parts design enables the first tunnel boring machine 3 and / or the second tunnel boring machine 43 to flexibly replace the cutting parts according to actual needs under various geological conditions from soft soil to hard rock. For example, in soft soil layers, soft and wear-resistant cutting parts are used, and in hard rock layers, high-strength cutting parts are used, thereby ensuring that the first tunnel boring machine 3 and / or the second tunnel boring machine 43 are always in the best working condition, effectively reducing the resistance during tunneling and increasing the tunneling speed.

[0047] In order to further ensure the consistency of excavation of each tunnel boring machine, in some embodiments, a displacement sensor is provided on the cutting piece to monitor the displacement of the cutting piece; wherein, by providing a displacement sensor on the cutting piece, the position change of the cutting piece can be monitored in real time, and real-time feedback can be given to the control system, so that the operator can timely understand the excavation status of each tunnel boring machine, and the precise displacement data can accurately determine the excavation depth of each area, avoid inconsistent depth or local over-excavation during the excavation process, and ensure that the depth of the entire excavation process meets the design requirements.

[0048] like Figure 3 As shown, in order to enhance the cleaning effect of the brush arm machine 5, in some embodiments, the brush arm machine 5 also includes a high-pressure nozzle, which is arranged on the brush head 51, wherein the high-pressure nozzle cooperates with the brush head 51 by spraying high-pressure water flow, thereby improving the efficiency of the brush head 51 in cleaning the soil adhered to the side wall of the blade foot 200, ensuring that the brush head 51 can perform a more thorough cleaning on the wall of the blade foot 200, remove surface attachments, keep the well wall smooth, and prevent these soils from forming leakage channels in subsequent construction, which helps to improve the bottom sealing quality of the wellbore 100.

[0049] In order to improve the cleaning efficiency, in some embodiments, a plurality of arm brush machines 5 are installed on the slide rail 2, wherein the plurality of arm brush machines 5 operate simultaneously to clean the side wall of the blade foot 200 in different areas, thereby covering more cleaning paths, greatly shortening the cleaning time, and improving the cleaning efficiency.

[0050] In order to further improve the anti-seepage performance, in some embodiments, the high-pressure nozzle and the brush head 51 can rotate along the axis of the wellbore 100 around the connection between the two and the brush arm 52; wherein, the high-pressure nozzle and the brush head 51 can rotate along the axis of the wellbore 100 around the connection between the two and the brush arm 52, so that the two can be aligned with the bottom of the waterstop belt, effectively removing the soil on the waterstop belt, further ensuring that the surface of the waterstop belt remains clean, avoiding soil adhesion, affecting the anti-seepage function of the waterstop belt, and preventing the formation of leakage channels.

[0051] To facilitate the maintenance and replacement of the brush arm machine 5, in some embodiments, the brush head 51 and the high-pressure nozzle are both detachably connected to the brush arm 52; wherein, the brush head 51 and the high-pressure nozzle are detachably connected to the brush arm 52, and both can be conveniently maintained, cleaned or replaced as needed. Especially after long-term use, the brush head 51 and the high-pressure nozzle may be worn or clogged. At this time, the operator can only dismantle the structure that needs to be replaced, thereby reducing downtime and increasing the service life of the equipment.

[0052] like Figure 2 As shown, in order to improve the flexibility of the device, in some embodiments, a third driving member 6 is provided on the slide rail 2, one end of the third driving member 6 can slide along the slide rail 2, and the other end of the third driving member 6 is detachably connected to the first tunneling machine 3 or the arm brush machine 5, so as to drive the first tunneling machine 3 or the arm brush machine 5 to slide along the slide rail 2; wherein, the third driving member 6 can be detachably installed with the first tunneling machine 3 or the arm brush machine 5 according to construction requirements, so as to realize rapid switching of different functions; and the third driving member 6 can drive the first tunneling machine 3 or the arm brush machine 5 to slide along the slide rail 2, so as to realize automatic adjustment of the position, replacing the traditional manual or external equipment moving method, ensuring the stability and accuracy of the movement, through the cooperation of the slide rail 2 and the third driving member 6, the first tunneling machine 3 or the arm brush machine 5 can operate within the entire range of the slide rail 2, covering different operating areas of the entire shaft 100, ensuring uniform coverage of the operating range, and improving construction efficiency and quality.

[0053] It can be understood that the first driving member 53, the second driving member and the third driving member 6 can be but are limited to using DC driving motors, which are not specifically limited here.

[0054] 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 method for excavating and sealing the bottom of a super-large cross-section vertical shaft, wherein the super-large cross-section vertical shaft comprises a shaft (100) and a blade foot (200), wherein: The excavation and bottom sealing method of the super-large cross-section vertical shaft comprises the following steps: S1: The blade foot (200) is installed at the bottom of the shaft (100), and a pre-buried ring beam (1) is arranged at the upper end of the inner wall of the blade foot (200) along the circumference of the shaft (100), and a slide rail (2) is arranged on the ring beam (1), and a first roadheader (3) is detachably mounted on the slide rail (2); S2: hoisting a central operating platform (4) into the interior of the super-large cross-section vertical shaft; the central operating platform (4) comprises supporting legs (41), a rotating disk (42) and a retractable second roadheader (43); the supporting legs (41) are evenly spaced along the circumference of the rotating disk (42) and are clamped with the ring beam (1); the second roadheader (43) is connected to the output end of the rotating disk (42); S3: The shaft (100) is pushed vertically into the ground, the first roadheader (3) slides on the slide rail (2) along the side wall of the blade foot (200) to excavate the outer ring area at the bottom of the shaft (100); the second roadheader (43) rotates around the central axis of the rotary disk (42) to excavate the inner ring area of ​​the shaft (100); the excavation speeds of the first roadheader (3) and the second roadheader (43) are set according to the ratio of the area of ​​the outer ring area to the area of ​​the inner ring area, so as to keep the excavation completion progress of the inner ring area the same as the excavation completion progress of the outer ring area, until the shaft (100) is excavated to the designed depth, and then the first roadheader (3) and the central operating platform (4) are dismantled and recovered; S4: The brush arm machine (5) is detachably mounted on the slide rail (2) and slides along the side wall of the blade foot (200), wherein the brush arm machine (5) comprises a brush head (51), a brush arm (52) and a first driving member (53), wherein the brush arm (52) is connected to the output end of the first driving member (53), the brush head (51) is connected to the brush arm (52), the first driving member (53) drives the brush arm (52) to drive the brush head (51) to move up and down along the axis of the wellbore (100), and the brush head (51) is attached to the side wall of the blade foot (200) and cleans its surface until the cleaning reaches the standard and the brush arm machine (5) is dismantled and recovered; S5: pouring bottom sealing concrete to complete the bottom sealing construction of the super-large section shaft.

2. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 1, characterized in that: The bottom surface of the ring beam (1) is configured as a concave-convex surface (11).

3. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 2, characterized in that: A water stop strip is arranged around the concave-convex surface (11).

4. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 1, characterized in that: A plurality of the first roadheaders (3) are installed in the super-large cross-section shaft, and each of the first roadheaders (3) is installed on the slide rail (2) and is located between adjacent supporting legs (41).

5. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 4, characterized in that: The first tunnel boring machine (3) comprises a first tunnel boring arm (31), a rotating member and a second driving member, the first tunnel boring arm (31) is connected to the output end of the second driving member, the second driving member can drive the first tunnel boring arm (31) to dig along the axis direction of the first tunnel boring arm (31), the rotating member connects the second driving member and the first tunnel boring arm (31), and the rotating member can drive the first tunnel boring arm (31) to rotate around the axis of the first tunnel boring arm (31) by a certain angle.

6. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 1, characterized in that: The first tunnel boring machine (3) and / or the second tunnel boring machine (43) are provided with a plurality of replaceable cutting parts.

7. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 6, characterized in that: The cutting pieces are each provided with a displacement sensor for monitoring the displacement of the cutting pieces.

8. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 1, characterized in that: The arm brushing machine (5) further comprises a high-pressure nozzle, and the high-pressure nozzle is arranged on the brush head (51).

9. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to claim 8, characterized in that: The brush head (51) and the high-pressure nozzle are both detachably connected to the brush arm (52).

10. The method for excavating and sealing the bottom of a super-large cross-section vertical shaft according to any one of claims 1 to 9, characterized in that: A third driving member is provided on the slide rail (2), one end of the third driving member can slide along the slide rail (2), and the other end of the third driving member is detachably connected to the first tunnel boring machine (3) or the arm brush machine (5) so as to drive the first tunnel boring machine (3) or the arm brush machine (5) to slide along the slide rail (2).

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