A water cut-off structure used during shaft construction and a construction method thereof

Abstract

The invention discloses a water intercepting structure used during shaft construction and a construction method thereof, and relates to the technical field of shaft construction. The structure comprises a shaft rock wall and a primary lining arranged on the inner wall of the shaft rock wall along the axial direction thereof, and also comprises an annular water intercepting groove arranged between the primary lining and the shaft rock wall and having a right-angled triangle cross section. A water intercepting plate which surrounds the primary lining and forms a V-shaped groove with the primary lining is arranged on one side of the primary lining away from the shaft rock wall and corresponds to the annular water intercepting groove. The V-shaped groove and the annular water intercepting groove are connected through a horizontal guide pipe. A water collecting box is further arranged below the annular water intercepting groove. The water collecting box and the annular water receiving groove are connected through a vertical water guide pipe. A water pump is arranged inside the water collecting box. The invention has simple construction, can be constructed synchronously with shaft excavation, has simple structural design, is easy to realize, and is simple to operate. The structure can effectively intercept water flow inside and outside the shaft wall of the primary lining, is conducive to improving the construction progress of the shaft, and has good economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of shaft construction, in particular to a water cut-off structure used during shaft construction and a construction method thereof. Background Art

[0002] During the construction of deep and large vertical shafts, water is a key factor restricting the progress of vertical shaft construction. With the increase of the depth of vertical shaft excavation, the water in bedrock fissures becomes more and more obvious. In the summer, the temperature and ground temperature in high-altitude and cold areas rise, and the surface snow melts and enters the bedrock along the surface cracks, causing water to flow out of the excavated shaft wall like rain, and the groundwater level rises, leading to well flooding accidents. In the field of coal mine construction technology, water management usually adopts ground pre-grouting and face curtain grouting technical measures to control the bedrock fissure water within a certain range. During the vertical shaft excavation process, wall grouting is adopted to stop water and then further block it to achieve the purpose of drilling a "dry well". The wall grouting needs to be implemented before pouring the lining formwork concrete after the high slag of the section is completed, or after the high formwork concrete construction of the next section is completed, the high wall grouting of the previous section is implemented. This results in a poor construction environment of the face, which is not conducive to civilized construction, takes a long time, affects the construction progress, and is not conducive to the control of the vertical shaft construction period.

[0003] Therefore, it is urgent to propose a water cut-off structure and a construction method thereof for use during shaft construction. Summary of the invention

[0004] The present invention aims to provide a water cut-off structure and a construction method thereof for use during shaft construction, so as to solve the above-mentioned problems.

[0005] The present invention is achieved through the following technical solutions:

[0006] A water interception structure used during shaft construction, comprising a shaft rock wall and a primary lining arranged on the inner wall of the shaft rock wall along the axial direction thereof, and also comprising an annular water interception trough arranged between the primary lining and the shaft rock wall and having a right-angled triangle cross-section, a side of the primary lining away from the shaft rock wall and corresponding to the annular water interception trough is further provided with a water interception plate which surrounds the primary lining and forms a V-shaped groove with the primary lining, the V-shaped groove and the annular water interception trough are connected by a water guide pipe, a water collecting box is further provided below the annular water interception trough, the water collecting box and the annular water receiving trough are connected by a vertical water guide pipe, a water pump is provided inside the water collecting box, and a reserved hole for installing a water pump is further provided at the position of the water collecting box on the side of the primary lining away from the shaft rock wall.

[0007] This scheme uses the annular water interception trough, water interception plate, water collecting box and water pump to collect the fissure water in the rock wall and the rain-like dripping water outside the well wall in the water collecting box, and pumps the water to the temporary water tank on the hanging plate in the shaft or to the outside of the well for recycling through the water pump in the water collecting box. In this way, the rain-like water, seepage water and rock wall fissure water on the outer and inner walls of the lining can be intercepted, and their further downward spread can be collected at the heading face, thus ensuring the dryness of the heading face construction, improving the construction progress and facilitating the control of the shaft construction period.

[0008] Furthermore, the bottom of the annular water intercepting trough is lower than the bottom elevation of the water pipe in the construction joint of the primary lining, one of the right-angled sides of the annular water intercepting trough is tightly attached to the side wall of the primary lining close to the rock wall of the vertical shaft, and its oblique edge is arranged in a direction away from the primary lining and inclined upward.

[0009] Furthermore, a drainage pipe for guiding the water in the rock wall of the vertical shaft into the annular water intercepting trough is provided above the annular water intercepting trough, and the drainage pipe is arranged upwardly and inclined in a direction away from the annular water receiving trough.

[0010] Preferably, the water cut-off plate is fixed to the outer wall of the primary lining by expansion bolts.

[0011] Preferably, the top end of the vertical water guide pipe is located at the bottom of the annular water intercepting groove, and the vertical water guide pipe is fixed to the rock wall of the vertical shaft by a U-shaped clamp.

[0012] Furthermore, a plurality of water level sensing alarm devices connected to the start and stop power of the water pump are provided inside the water collecting tank at the highest water level line.

[0013] Furthermore, the water pump is a horizontal pump, the drainage capacity of the water pump should be no less than 1.2 times the normal water inflow, and a spare water pump should be equipped, and the rated head of the water pump should be greater than the actual drainage height.

[0014] Furthermore, the water cut-off structure can be set at one or more locations according to the water seepage of the primary lining of the shaft and the water cut-off effect, to ensure that the water inflow at the face is no more than 6m 3 / h.

[0015] A construction method for a water cut-off structure used during shaft construction, for constructing a water cut-off structure used during shaft construction, comprising the following steps:

[0016] S1. Perform primary lining construction along the axial direction of the shaft to the bottom of the primary lining of the nth module, and excavate an annular intercepting ditch, where n>0 and is a positive integer, and perform anti-leakage treatment on the bottom of the annular intercepting ditch;

[0017] S2. Drill holes to relieve pressure at the concentrated water outlet of the vertical shaft rock wall above the annular intercepting trough, and install drainage pipes to guide the water flow into the annular intercepting trough;

[0018] S3, install the formwork between the annular water cut-off groove and the inner wall of the primary lining of the nth formwork, and pre-embed the water guide pipe above or below the construction joint between the nth formwork and the n+1th formwork;

[0019] S4, using geotextile to plug and wrap the water pipe (5), and then pouring the first lining (2) concrete of the nth mold; after removing the mold, remove the geotextile plugging the water pipe;

[0020] S5, continue to blast downward to the primary lining of the n+1th mold to install the water collecting tank;

[0021] S6. Install a vertical water pipe at the bottom of the annular intercepting trough to the water collecting tank, and install a template within the water collecting tank. Set a water pump reserved hole on the template, install a water pump reserved hole component, plug the water pump reserved hole with a geotextile, and then pour the first lining concrete of the n+1 template; remove the blocked geotextile after demoulding;

[0022] S7. Place the water pump into the water collection tank through the reserved hole in S6 and install it. The water pump is a horizontal pump. The drainage capacity of the water pump is not less than 1.2 times the normal water inflow. A spare water pump should be equipped. The rated head of the water pump should be greater than the actual drainage height.

[0023] S8. Install a water cut-off plate at the bottom of the water guide pipe of the first lining of the nth mold.

[0024] It should be further explained that this scheme is simple to construct and can be constructed simultaneously with the excavation of the shaft. It has a simple structural design, is easy to implement and simple to operate. It can effectively intercept the water flow inside and outside the shaft wall of the primary lining 2, which is beneficial to improving the construction progress of the shaft. It has good economic benefits and can provide reference for similar projects in different fields.

[0025] Specifically, in S5, before constructing and installing the water collecting tank, the following steps are also included:

[0026] S51, Hand-held YT-28 pneumatic drill to construct the cavern for installing the water collection tank;

[0027] S52. Carry out temporary waterproofing treatment on the inner wall of the cave.

[0028] Preferably, in S3 and S6, the water guide pipe and the vertical water guide pipe are both made of PVC hard pipe, and the inner diameters of the water guide pipe and the vertical water guide pipe are both ≥50 mm.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] (1) The present invention can collect the fissure water of the rock wall and the rain-like dripping water outside the shaft wall in the water collecting box by means of the annular water interception groove, water interception plate, water collecting box and water pump arranged between the primary lining and the shaft rock wall, and then pump the water to the temporary water tank on the hanging plate in the shaft or to the shaft for recycling outside the shaft through the water pump in the water collecting box, thereby intercepting the rain-like dripping water, seepage water and fissure water of the rock wall from the outer and inner walls of the lining, preventing them from further spreading downward and collecting them at the tunnel face, thereby ensuring the dryness of the tunnel face construction and improving the construction progress;

[0031] (2) The invention is simple to construct and can be constructed simultaneously with the excavation of the shaft. It has a simple structural design, is easy to implement and is simple to operate. It can effectively intercept the water flow inside and outside the primary lining shaft wall, which is beneficial to improving the construction progress of the shaft and has good economic benefits.

[0032] (3) The water cut-off structure can realize water cut-off and drainage at the same time. The design structure is simple, the construction is convenient, safe and reliable, it can be set up in multiple sections, it has strong operability and good water cut-off effect. The annular water cut-off groove and water cut-off plate are easy to realize and can effectively cut off the bedrock fissure water and rain-like dripping water on the inner and outer walls of the primary lining, ensuring that the working face is always in a dry working environment. The water cut-off plate does not affect the lifting of the hoisting platform in the shaft, and ensures the smooth transportation of materials in the shaft, does not affect the excavation speed, and is conducive to the realization of the total construction period target of the shaft;

[0033] (4) The annular intercepting trough, water collecting box and water intercepting plate can be constructed simultaneously during the excavation of the shaft. There is no need to organize additional construction personnel for construction. The process connection is tight. The water collection box pumping adopts intelligent and information-based means, which saves additional labor input and reduces construction costs. The water collected in the water collection well can be pumped out of the well for recycling, which is conducive to resource conservation.

[0034] (5) Components such as water collecting tanks, water intercepting plates, water pipes, and U-shaped clips can be made from local materials, which are inexpensive, save construction costs, are easy to install, and each component is easy to process, resulting in high construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0036] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the process of Example 2 of the present invention.

[0039] In the above drawings, the component names corresponding to the reference numerals are as follows:

[0040] 1. Shaft rock wall; 2. Primary lining; 20. Pipe reserved hole; 3. Annular water cut-off trough; 4. Water cut-off plate; 5. Water guide pipe; 6. Water collecting tank; 7. Vertical water guide pipe; 8. Water pump; 9. Water pipeline; 10. Water level sensing alarm device; 11. Water diversion and drainage pipe. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0042] First of all, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0043] Embodiment 1;

[0044] like Figure 1 to Figure 2 As shown, the present embodiment provides a water intercepting structure for use during shaft construction, comprising a shaft rock wall 1 and a primary lining 2 arranged on the inner wall of the shaft rock wall 1 along the axial direction thereof, and also comprising an annular water intercepting groove 3 arranged between the primary lining 2 and the shaft rock wall 1 and having a right-angled triangular cross-section, a side of the primary lining 2 away from the shaft rock wall 1 and corresponding to the annular water intercepting groove 3 is further provided with a water intercepting plate 4 surrounding the primary lining 2 and forming a V-shaped groove with the primary lining 2, the V-shaped groove and the annular water intercepting groove 3 are connected through a water guide pipe 5, a water collecting box 6 is further provided below the annular water intercepting groove 3, the water collecting box 6 is connected to the annular water receiving groove through a vertical water guide pipe 7, a water pump is provided inside the water collecting box 6, and a reserved hole for installing a water pump is further provided at the position of the water collecting box 6 on the side of the primary lining 2 away from the shaft rock wall 1.

[0045] In this embodiment, the bottom of the annular water intercepting ditch 3 is lower than the bottom elevation of the water pipe 5 in the construction joint of the primary lining 2. One of the right-angled sides of the annular water intercepting ditch 3 is tightly attached to the side wall of the primary lining 2 close to the vertical shaft rock wall 1, and its oblique edge is away from the primary lining 2 and inclined upward, so as to facilitate the water flow to be gathered at the vertical water pipe 7, so that the water flow flows into the water collecting tank 6 through the vertical water pipe 7.

[0046] In this embodiment, a drainage pipe 11 is provided above the annular water intercepting trough 3 for guiding the water in the vertical shaft rock wall 1 to enter the annular water intercepting trough 3. The drainage pipe 11 is arranged upwardly and inclined in a direction away from the annular water receiving trough. It should be noted here that when the vertical shaft rock wall 1 is constructed, there will often be concentrated water flow or strand-shaped water outlet points. For the concentrated water flow or strand-shaped water outlet points of the vertical shaft rock wall 1, the user can drill holes to relieve pressure and then insert a concentrated drainage pipe to drain the water flow into the annular water intercepting trough 3 through it.

[0047] In this embodiment, the water cut-off plate 4 is fixed to the outer wall of the primary lining 2 by expansion bolts.

[0048] In this embodiment, the top of the vertical water pipe 7 is located at the bottom of the annular water intercepting trough, and the vertical water pipe 7 is fixed to the shaft rock wall 1 by a U-shaped clamp, wherein the U-shaped clamp can be selected as φ8mm smooth round steel bars and processed centrally in a steel bar yard.

[0049] In this embodiment, a plurality of water level sensing alarm devices 10 connected to the start and stop power of the water pump are provided inside the water collecting tank 6 at the position of the highest water level line. Through the setting of the water level alarm device, when the water level in the water collecting tank 6 reaches the highest water level line, the water level sensing alarm device 10 can start working and sound an alarm to start the water pump 8 to pump the water in the water collecting tank 6 to a temporary water tank on the hanging tray or to recycle it outside the well. It should be noted that the water level sensing alarm device 10 is model ZSB127 and is purchased on the market. It is a prior art. In this embodiment, the water level sensing alarm device 10 is connected to the water pump 8 through a feedback circuit.

[0050] In the above embodiment, the water pump is a horizontal pump, the drainage capacity of the water pump should be no less than 1.2 times the normal water inflow, and a spare water pump should be equipped. The rated head of the water pump should be greater than the actual drainage height. At the same time, the water cut-off structure can be set at one or more locations according to the water seepage of the primary lining of the shaft and the water cut-off effect, to ensure that the water inflow at the face is no more than 6m 3 / h.

[0051] In the above embodiment, in order to ensure that the water pipe 5 and the vertical water pipe 7 can guide the water out of the vertical shaft rock wall in the high-cold area, the present embodiment is more preferably provided with a cold-resistant protective layer on the outer surface of the water pipe 5 and the vertical water pipe 7, and the thermal insulation layer includes a geogrid laid on the surface of the water pipe 5 and the vertical water pipe 7, a steel pipe cage surrounded by the geogrid and welded by steel bars with a diameter of Φ12mm, and a concrete layer cast on the outer surface of the steel pipe cage. Therefore, by setting the thermal insulation protective layer, the water pipe 5 and the vertical water pipe 7 can be effectively prevented from being damaged by frost heave in the high-cold area, and the compressive strength of the water pipe 5 and the vertical water pipe 7 can be effectively improved to prevent them from being ruptured and damaged by external stress during use after the construction is completed.

[0052] It should be further explained that, in this embodiment, the fissure water of the rock wall and the rain-like dripping water outside the well wall are collected in a water collection well through the annular water intercepting groove 3 between the inner wall of the primary lining 2 and the rock wall and the V-shaped water intercepting plate 4 arranged on the outer wall of the primary lining 2, and the water is pumped to a temporary water tank on the hanging plate or recycled outside the well through a water pump in the water collection well, so as to intercept the rain-like water, seepage water and rock wall fissure water from the outer and inner walls of the primary lining 2, prevent them from further spreading downward and collect them at the heading face, thereby ensuring that the heading face construction is dry and improving the construction progress.

[0053] Embodiment 2;

[0054] See also Figure 3 As shown, based on Example 1, this embodiment provides a construction method of a water cut-off structure during shaft construction, which is described in detail from another aspect in order to better understand the present technology, and specifically includes the following steps:

[0055] S1, construct the primary lining 2 along the axial direction of the shaft rock wall 1 to the bottom of the n-th mold primary lining 2, and use a handheld YT-28 pneumatic drill to excavate the annular cut-off groove 3, where n>0 and is a positive integer. Preferably, after the construction of the annular cut-off groove 3 is completed, temporary leakage prevention measures should be taken between the annular cut-off groove 3 and the shaft rock wall 1, wherein the leakage prevention measures can be shotcrete;

[0056] S2, drilling pressure relief at the concentrated water outlet of the vertical shaft rock wall 1 above the annular water cut-off trough 3, and installing a drainage pipe 11 to guide the water flow into the annular water cut-off trough 3;

[0057] S3, installing a template between the annular water cut-off groove 3 and the inner wall of the primary lining 2 of the nth template, and pre-embedding a water guide pipe 5 in a horizontal direction above or below the construction joint of the nth template and the n+1th template;

[0058] S4, wrap the horizontal water pipe 5 with geotextile and steel cage, and then pour the first lining 2 concrete of the nth mold;

[0059] S5. Continue to dig downward to the first lining of the n+1th mold, and install the water collecting tank 6. The size of the water collecting tank 6 is determined according to the amount of rain on the well wall and the amount of water in the fissure of the vertical shaft rock wall 1. The water collecting tank 6 can be formed on site using a hard plastic barrel or a steel plate with a thickness of d, where d≥3mm. Before installing the water collecting tank 6, the following steps are also included:

[0060] S51, handheld YT-28 pneumatic drill for installing the cavern of water collecting tank 6,

[0061] S52, temporary anti-leakage treatment is carried out on the inner wall of the cave;

[0062] S6, installing a vertical water pipe 7 at the bottom of the annular water intercepting trough 3 to the water collecting box 6, and installing a template within the range of the water collecting box 6, setting a water pump reserved hole on the template, and installing a water pump reserved hole component, using a geotextile to block the water pump reserved hole, and then pouring the n+1th mold primary lining 2 concrete, specifically, installing a vertical water pipe 7 from the bottom of the annular water intercepting trough 3 set in the nth mold to the water collecting box 6 set between the inner wall of the n+1th mold primary lining 2 and the bedrock, and after installing the vertical water pipe 7, performing protective construction on its exterior;

[0063] S7. Place the water pump into the water collection tank through the reserved hole in S6 and install it. The water pump is a horizontal pump. The drainage capacity of the water pump is not less than 1.2 times the normal water inflow. A spare water pump should be equipped. The rated head of the water pump should be greater than the actual drainage height.

[0064] S8. Install a water cut-off plate 4 at the bottom of the water guide pipe 5 in the horizontal direction of the primary lining 2 of the nth mold.

[0065] In this embodiment, in S3 and S6, the water pipe 5 and the vertical water pipe 7 are both made of PVC hard pipe material, and the inner diameters of the water pipe 5 and the vertical water pipe 7 are both ≥50 mm.

[0066] It should be noted here that the construction of this embodiment is simple and can be constructed simultaneously with the excavation of the shaft body. The structural design is simple, easy to implement and simple to operate. It can effectively intercept the water flow inside and outside the shaft wall of the primary lining 2, which is beneficial to improving the construction progress of the shaft. It has good economic benefits and can provide reference for similar projects in different fields.

[0067] Example 3

[0068] To further demonstrate the advantages of the above embodiment, this embodiment is explained in conjunction with the construction of a 22.13 km long tunnel in Xinjiang. The tunnel adopts a "3 holes + 4 shafts" design scheme, in which the No. 4 shaft has a designed net diameter of 9.0 m, a maximum excavation diameter of 11.3 m, and a designed shaft of 645.4 m. According to geological data, the surrounding rock of Shaft No. 4 is marble with developed cracks and relatively broken rock strata. It is 107m away from the F7 fault fracture zone. The stratified water inflow of Shaft No. 4-1 is 7062mm³ / d, and the stratified water inflow of Shaft No. 4-2 is 7186mm³ / d, which is equivalent to an hourly water inflow of 294.25m³ / h~299.42m³ / h. After the implementation of ground pre-grouting water plugging technology from May 26, 2021 to October 28, 2021, when the shaft heading was excavated to 225m, rain-like dripping water appeared on the shaft wall, and the rain-like dripping water decreased as the heading was excavated downward. During the construction process, water interception measures such as an annular water interception trough + water collecting box + water interception plate were adopted behind the wall, which achieved good results, so that the heading at the bottom of the shaft has a good construction environment and has the purpose of drilling a "dry well".

[0069] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a water cut-off structure used during shaft construction, used to construct a water cut-off structure used during shaft construction, characterized in that: The structure comprises a vertical shaft rock wall (1) and a primary lining (2) arranged on the inner wall of the vertical shaft rock wall (1) along the axial direction thereof, and also comprises an annular water intercepting groove (3) arranged between the primary lining (2) and the vertical shaft rock wall (1) and having a right-angled triangle cross section, a water intercepting plate (4) surrounding the primary lining (2) and forming a V-shaped groove with the primary lining (2) is provided on a side of the primary lining (2) away from the vertical shaft rock wall (1) and corresponding to the annular water intercepting groove (3), the V-shaped groove and the annular water intercepting groove (3) are connected via a water guide pipe (5), a water collecting box (6) is provided below the annular water intercepting groove (3), the water collecting box (6) is connected to the annular water receiving groove via a vertical water guide pipe (7), a water pump (8) is provided inside the water collecting box (6), and a reserved hole for installing a water pump is provided at a position corresponding to the water collecting box (6) on a side of the primary lining (2) away from the vertical shaft rock wall (1); The construction method specifically comprises the following steps: S1, constructing a primary lining (2) along the axial direction of the vertical shaft rock wall (1) to the bottom of the n-th module primary lining (2), and excavating an annular intercepting trench (3), wherein n>0 and is a positive integer; S2, drilling a hole to relieve pressure at the concentrated water outlet of the vertical shaft rock wall (1) above the annular intercepting groove (3), and installing a drainage pipe (11) to guide the water flow into the annular intercepting groove (3); S3, installing a formwork between the annular water intercepting groove (3) and the inner wall of the primary lining (2) of the nth formwork, and pre-embedding a water guide pipe (5) above or below the construction joint between the nth formwork and the (n+1)th formwork; S4, using geotextile to plug the water pipe (5), and then pouring the first lining (2) concrete of the nth mold; after removing the mold, remove the geotextile plugging the water pipe; S5, continue to blast downward to the primary lining of the n+1th mold to construct and install a water collecting tank (6); S6, installing a vertical water pipe (7) at the bottom of the annular intercepting groove (3) into the water collecting tank (6), and installing a template within the range of the water collecting tank (6), setting a water pump reserved hole on the template, and installing a water pump reserved hole component, using a geotextile to plug the water pump reserved hole, and then pouring the (n+1) first lining (2) concrete; after demolding the template, remove the plugging geotextile; S7. Place the water pump in the water collecting tank (6) through the reserved hole for the water pump in S6 and install it, wherein the water pump (8) is a horizontal pump, the drainage capacity of the water pump (8) is not less than 1.2 times the normal water inflow, and a spare water pump should be provided, and the rated head of the water pump should be greater than the actual drainage height; S8. Install a water cut-off plate (4) at the bottom of the water guide pipe (5) of the primary lining (2) of the nth mold.

2. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: The bottom of the annular intercepting groove (3) is lower than the bottom elevation of the water pipe (5) in the construction joint of the primary lining (2); one of the right-angled sides of the annular intercepting groove (3) is closely attached to the side wall of the primary lining (2) close to the vertical shaft rock wall (1); and its oblique side is arranged in a direction away from the primary lining (2) and inclined upward.

3. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: A drainage pipe (11) for guiding water from the vertical shaft rock wall (1) into the annular water intercepting groove (3) is also provided above the annular water intercepting groove (3); the drainage pipe (11) is arranged obliquely upward in a direction away from the annular water receiving groove.

4. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: The water cut-off plate (4) is fixed to the outer wall of the primary lining (2) by means of expansion bolts.

5. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: The top end of the vertical water guide pipe (7) is located at the bottom of the annular water intercepting groove, and the vertical water guide pipe (7) is fixed to the vertical shaft rock wall (1) via a U-shaped clamp.

6. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: A plurality of water level sensing alarm devices (10) connected to the start and stop functions of the water pump (8) are also provided inside the water collecting tank (6) at the highest water level line.

7. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: In S5, before constructing and installing the water collecting tank (6), the following steps are also included: S51, using a handheld YT-28 pneumatic drill to construct the cavern for installing the water collecting tank (6); S52. Carry out temporary waterproofing treatment on the inner wall of the cave.

8. A construction method for a water cut-off structure during shaft construction according to claim 1, characterized in that: In S3 and S6, the water guide pipe (5) and the vertical water guide pipe (7) are both made of PVC hard pipe material, and the inner diameters of the water guide pipe (5) and the vertical water guide pipe (7) are both ≥50 mm.

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