Vertical shaft wall with complete water-resisting layer and construction method

Abstract

The invention discloses a vertical shaft wall with a complete water-resisting layer and a construction method, and belongs to the technical field of mine construction engineering. A segmented construction method is adopted, a grouting waterproof layer, a flexible waterproof layer and a vertical shaft wall are sequentially constructed on the side face of surrounding rock excavated in each well section, so that the waterproof vertical shaft wall with a complete water-resisting layer is jointly formed, water leakage and water seepage of the shaft wall in the construction and production period are prevented, and grouting and water sealing do not need to be conducted after the shaft wall is constructed; when the flexible waterproof layer is constructed on the grouting waterproof layer and the vertical shaft wall is constructed on the flexible waterproof layer, lap joint sections are reserved, when the grouting waterproof layer and the flexible waterproof layer of the next well section are constructed, construction is repeated on the lap joint sections to form a double-layer staggered lap joint structure, joint water seepage is prevented, well section stratum excavation is repeated, and the construction efficiency is improved. The construction of the shaft wall of the whole vertical shaft is completed, and the shaft wall of the vertical shaft with a complete water-resisting layer is formed. The process is simple, the water seepage prevention effect is good, and the manufacturing cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of mine construction engineering, and in particular to a vertical shaft wall with a complete water-proof layer and a construction method. Background Art

[0002] In existing projects, for water-rich rock formations, some projects use double-layer reinforced concrete wellbore linings without plastic interlayers (referred to as "double-layer wellbore lining"). In these two wellbore lining structures, the outer wellbore primarily resists formation pressure and construction loads during construction, and secondarily, it works with the inner wellbore to resist formation pressure during use. Due to the presence of numerous construction joints, the outer wellbore cannot resist groundwater pressure. The inner wellbore primarily resists groundwater pressure during use, and secondarily, it works with the outer wellbore to resist formation pressure.

[0003] In the existing technology, whether it is a double-layer well wall or a double-layer composite well wall, the thickness of the well wall designed according to the current specifications increases rapidly with the increase of the wellbore depth, resulting in a sharp increase in the freezing and excavation of the wellbore, a significant extension of the construction period, and the emergence of severe problems such as crack prevention of large-volume concrete in the well wall. After the frozen wall thaws, groundwater flows into the wellbore through the well wall joints, affecting the normal use of the wellbore and even flooding the well. The main channels for water leakage in the single-layer well wall are the construction joints of the upper and lower sections of the well wall and the cracks generated in the well wall itself. To address the leakage of the well wall joints, the existing single-layer well wall is mainly waterproofed by setting various water retaining plates at the well wall joints, and then performing grouting treatment. There are problems such as the installation of grouting pipelines and grouting treatment procedures, and the waterproofing effect is unreliable in actual application. The joints need to be grouted and sealed at the right time. Before sealing, a large amount of water may gushed out due to cracks in the well wall and leakage at the joints, seriously threatening the safety and normal use of the mine.

[0004] The traditional double-layer well wall or double-layer composite well wall has a design thickness of the inner and outer layers exceeding 4m due to the increase in the depth of the wellbore. On the one hand, this is extremely unreasonable, and on the other hand, the project cost has also increased dramatically. In recent years, the practice of single-layer well walls in multiple wellbores has shown that the effect of grouting and sealing the well wall joints and well wall concrete at the right time is sometimes unsatisfactory. The grouting and water blocking work has certain uncertainties and leads to delays in the construction period, which makes the existing single-layer well wall technology difficult to promote. Therefore, the construction of deep wells in water-bearing strata faces the difficult problem of how to effectively thin the well wall thickness while effectively preventing water leakage from the well wall. The present invention is proposed in the context of solving this problem.

[0005] Prior art CN113356887A discloses a single-layer well wall with a grouting water-stop connector and its construction method. It includes an upper well wall and a lower well wall, with a construction joint provided between the upper and lower well walls. At the construction joint, the upper and lower well walls are connected via a grouting water-stop connector. The grouting water-stop connector includes a flexible tube in a closed annular shape and embedded between the upper and lower well walls. The upper and lower ends of the flexible tube are fixedly connected to steel plate edges, which are respectively embedded in the upper and lower well walls. A grouting hole is provided on the flexible tube facing the construction joint on the side close to the outer wall of the wellbore. The flexible tube is also provided with a grouting pipe, which has a grouting port on the inner wall of the wellbore. The sealing effect is poor and the construction is complicated. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, a vertical shaft wall and construction method with a complete waterproof layer are provided. Through the grouting waterproof layer and the flexible waterproof layer and their respective overlapping structures, the method has good waterproof performance, simple construction, low cost, and is suitable for shafts constructed using various methods with water sealing requirements, and has great economic benefits and practical value.

[0007] In order to achieve the above-mentioned technical objectives, the present invention discloses a vertical shaft wall with a complete water-proof layer. The vertical shaft wall with a complete water-proof layer is composed of a plurality of upper and lower shaft sections. Each shaft section includes a grouting waterproof layer and a vertical shaft wall sequentially arranged on the side of the surrounding rock. The connection between the grouting waterproof layers in the upper and lower adjacent shaft sections is a double-layer staggered overlap structure to improve the sealing performance. The bottom of the vertical shaft wall at the bottom of each shaft section is cast as a blade foot structure, so that the shaft wall joints formed by the upper and lower adjacent shaft walls can effectively prevent water seepage.

[0008] Furthermore, a flexible waterproof layer is added between the grouting waterproof layer and the vertical shaft wall, and the connection between the flexible waterproof layers of the upper and lower adjacent well sections is a double-layer staggered overlap structure.

[0009] Furthermore, the flexible waterproof layer is located between the grouting waterproof layer and the well wall, and the flexible waterproof layer needs to ensure that it does not crack within the temperature range of -30℃~60℃; the material of the flexible waterproof layer is a combination of two or more of resin mortar, resin, polyurea, asphalt, butyl waterproof tape, aluminum foil and steel foil with a thickness not exceeding 0.5mm.

[0010] A method for constructing a vertical shaft wall with a complete waterproof layer adopts a segmented construction method, wherein a grouting waterproof layer and a vertical shaft wall are sequentially constructed on the side of the surrounding rock excavated in each well section to form a complete waterproof layer, thereby preventing water leakage and water seepage during construction and production, and no grouting and water sealing is required after the well wall construction; an overlapping section is left when constructing the vertical shaft wall on the grouting waterproof layer, and when constructing the grouting waterproof layer of the next well section, the construction is repeated in the overlapping section to form a double-layer staggered overlapping structure, thereby preventing water seepage at the joints, and the well section stratum excavation is repeated until the well wall construction of the entire vertical shaft is completed.

[0011] Furthermore, before constructing the vertical shaft wall, a flexible waterproof layer is first constructed on the grouting waterproof layer, and then the vertical shaft wall is constructed on the flexible waterproof layer. When constructing the vertical shaft wall on the flexible waterproof layer, an overlapping section of the flexible waterproof layer of the next well section is left.

[0012] Further, the specific steps are as follows:

[0013] S1. Excavate the well section according to the designed outer diameter of the well wall and add a margin. The excavation depth of the well section includes the height of the well wall construction section and the staggered overlapping sections of the intact waterproof layer between adjacent sections;

[0014] S2. Erect a grouting waterproofing layer template based on the designed outer diameter of the well wall plus twice the minimum designed thickness of the grouting waterproofing layer. Utilize a grouting pipe with an outlet below the grouting waterproofing layer template to inject grout into the space to be injected between the grouting waterproofing layer template and the side of the excavated surrounding rock to form a grouting waterproofing layer. Simultaneously, an effective grouting waterproofing layer is formed and the over-excavated area is densely filled by grouting.

[0015] S3. Apply or paste waterproof material on the grouting waterproof layer to form a flexible waterproof layer. When spraying or pasting the waterproof material to form the flexible waterproof layer, leave an overlap section below the grouting waterproof layer. The overlap section height of the grouting waterproof layer is L2. The flexible waterproof layer and the grouting waterproof layer together form a water-proof layer. When constructing the flexible waterproof layer on the grouting waterproof layer, it is necessary to leave an overlap section below the flexible waterproof layer for constructing the grouting waterproof layer in the next well section. The overlap section height is L4.

[0016] S4: After pouring the formwork according to the designed inner diameter of the well wall, tying the steel bars and pouring the concrete for the vertical well wall, the well wall is cast. When constructing the well wall, it is also necessary to leave an overlap section of the flexible waterproof layer of the next well section, with a height of L4. After removing the formwork, the well wall construction of the current well section is completed.

[0017] S5. Excavate the next well section and repeat steps S2 to S4 to connect the well walls in each well section. At the same time, a double-layer staggered overlapping structure is formed on the overlapping sections of the grouting waterproof layer and the flexible waterproof layer in each well section until the construction of the entire vertical well wall is completed.

[0018] Furthermore, the excavation depth of each well section is L1, which is the sum of the well wall construction depth L3 and the grouting pipe connection margin L2. The height of the blade foot formed by the blade foot template below the well wall from the bottom plate of the current well section is L2+L4. The height L2 of the overlapping section of the adjacent grouting waterproof layer is 50mm~500mm. The outer diameter of the grouting waterproof layer template within the height range of L2 is 10mm~80mm larger than the designed well wall outer diameter; the height L4 of the overlapping section of the adjacent flexible waterproof layer is 50mm~200mm, and the overlapping surface needs to be cleaned before overlapping.

[0019] Furthermore, cement slurry with an early strength agent, cement-water glass double liquid slurry, and polyurethane grouting materials with an initial setting time of more than 5 minutes and a final setting time of no more than 2 hours are injected into the gap between the grouting waterproof layer template and the side of the surrounding rock through the grouting pipe; the volume ratio of the cement-water glass double liquid slurry is 1:0.2~1. After excavation, the side of the surrounding rock will be uneven due to over-excavation. The effective thickness of the grouting waterproof layer is 30~150mm, and the final setting time is 10~60 minutes. When constructing in water-bearing strata, a foam board is added between the grouting waterproof layer and the side of the surrounding rock as a buffer layer.

[0020] Furthermore, the construction process of the flexible waterproof layer is as follows: first brush a layer of resin with a thickness of 0.1~0.2mm on the inner wall of the grouting waterproof layer, generally vinyl resin, and after the resin layer is dried, brush a layer of polyurea with a thickness of 0.2~1mm to form a flexible waterproof layer.

[0021] Furthermore, when constructing the well wall of each section, at the height of L2+L4 above the grouting waterproof layer, the blade foot formwork is erected, the steel bars are tied, the well wall concrete pouring formwork is erected, and then concrete is poured to form a well wall with a waterproof layer, just like the conventional wellbore outer wall construction.

[0022] Beneficial effects: Compared with the currently commonly used single-layer well wall, the method for constructing a vertical shaft wall with a complete waterproof layer according to the present invention can effectively solve the leakage caused by cracks and joints in the well wall, and reduce construction delays or well flooding accidents caused by grouting and water blocking due to wellbore leakage. Compared with the traditional double-layer well wall, the total thickness of the well wall is greatly reduced. When the wellbore depth is 600m, the double-layer composite well wall constructed by the freezing method has a thickness of more than 2m even if two layers of C90 are used. By using the present invention and an effective grouting waterproof layer, the thickness can be reduced to within 1.2m, which greatly reduces construction investment costs and reduces safety risks. It has a wide range of adaptability to wellbores constructed by various methods. Summary of the Invention

[0023] Figure 1 It is a schematic diagram of the first section of the wellbore with a height of L1 excavated after the freezing wall is engaged in an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the formation of the first section of the grouting waterproof layer in an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure after the first section of the well wall is cast in an embodiment of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the second section of high grouting waterproof layer formwork after the formwork is erected in an embodiment of the present invention.

[0027] Figure 5 It is a schematic cross-sectional view of the well wall structure formed after four well sections are excavated and built in an embodiment of the present invention.

[0028] Figure 6 Schematic diagram of the cross section of a wellbore with a complete aquiclude in an embodiment of the present invention.

[0029] Figure 7 Schematic diagram of a double-layer staggered overlapping structure formed by overlapping sections in an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the installation of the blade foot template in an embodiment of the present invention.

[0031] In the figure: 1. Water-bearing stratum, 2. Grouting waterproof layer, 3. Flexible waterproof layer, 4. Well wall, 5. Grouting waterproof layer template, 6. Overlap section, 7. Space to be injected with slurry, 8. Well wall joint, 9. Frozen wall, 10. Side surface of surrounding rock, 11. Grouting pipe. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] As shown, the present invention discloses a method for constructing a vertical shaft wall with a complete water-proof layer, and the specific steps are as follows:

[0034] When constructing a vertical shaft, use drilling and blasting or excavation methods such as excavation to excavate a section height downward, the section height length is L1; the diameter of the grouting template is excavated according to the designed shaft wall outer diameter + 2 times the thickness of the effective grouting waterproof layer 3, the height of the grouting waterproof layer template 5 is L1, and the outer diameter within the height range of the upper part L3 = L1-L2 (L2 = 50mm~500mm, the lower part L2 is the overlap height of the adjacent grouting waterproof layer) is the same as the designed shaft wall 4 outer diameter, as shown in the following example: Figure 7 As shown, Figure 7 The interface between the green and black parts is the staggered overlap section of the grouting waterproof layer, and the red part is the overlap of the flexible waterproof layer; the outer diameter within the height range of L2 is 10mm~80mm larger than the outer diameter of the designed well wall 4, and slurry is injected into the slurry space 7 to be injected between the grouting waterproof layer template 5 and the excavated surrounding rock side surface 10, and the slurry quickly solidifies to form a grouting waterproof layer 3; the grouting waterproof layer template 5 is removed, and the surface of the solidified slurry L3 is sprayed or pasted with waterproof material to form a flexible waterproof layer 3, and the grouting waterproof layer 2 and the flexible waterproof layer 3 form a complete waterproof layer with a height of L3; the well wall blade template is vertically cast, such as Figure 8 As shown, when the blade foot formwork is installed, its lower edge is L2+L4 higher than the lower edge of the grouting formwork, where L4 is the overlap length of the flexible waterproof layer 3 and the upper section height, L4=50mm~200mm; after the blade foot formwork is installed, the well wall vertical reinforcement and annular reinforcement are tied, the well wall formwork is erected according to the designed inner diameter of the well wall 4, and the well wall concrete is poured to complete the first section height of the well wall 4 pouring construction of L=L1-L2-L4.

[0035] Continue excavating downward by one segment, L3. Set up a grouting formwork again, at a height of L1, based on the designed shaft wall outer diameter plus twice the effective grouting waterproofing layer thickness. Slurry is injected between the formwork, the inner surface of the excavated surrounding rock, and the space between the overlapping segments 6 of the adjacent grouting waterproofing layers. The slurry rapidly solidifies, forming a second segment of grouting waterproofing layer 2. The overlap between this segment and the previous segment is L2. Remove the grouting formwork, and spray or apply waterproofing material to the surface within the area L3 and L4 above the solidified slurry in the second segment, forming a flexible waterproofing layer 3. The overlap between this flexible waterproofing layer 3 and the previous segment is L4. Set up the shaft wall blade formwork, with its lower edge elevated L2 + L4 above the lower edge of the grouting formwork. Tie the shaft wall vertical and circular reinforcement. Set up the shaft wall formwork, and pour concrete, completing the second segment of shaft wall 4, at a height of L = L1 - L2 - L4. Continue digging and laying in the second stage of the cycle. When the wellbore changes its diameter, the diameter change position should be placed in the impermeable layer. After the diameter is changed, construction is carried out again according to the new diameter until the wellbore of the required depth is built.

[0036] The thickness of the well wall 4 is designed according to the depth of the well wall 4 and its required bearing capacity, and is generally greater than 300 mm.

[0037] Example: The present invention provides a method for constructing a vertical shaft wall with a complete water-proof layer. First, a cylindrical frozen wall 9 surrounding the vertical shaft is constructed using refrigeration equipment in the water-bearing stratum 1 outside the vertical shaft to be excavated. Then, the vertical shaft is constructed in sections within the frozen wall 9.

[0038] Step 1: If Figure 1 As shown, after the frozen wall 9 is completed and excavation conditions are met, the water-bearing rock layer 1 is excavated according to the designed wellbore outer diameter + 200mm excavation diameter to form the first unsupported wellbore section, with a section height of L1. After excavation, the surrounding rock side 10 will be uneven due to over-excavation.

[0039] Step 2: If Figure 2 According to the outer diameter of the well wall design, a grouting waterproof layer template 5 is erected, and a double liquid slurry mainly composed of cement and water glass with a volume ratio of 1:0.5 is injected into the gap between the template and the side of the surrounding rock through the grouting pipe 11 located at the bottom of the template. The effective thickness of the grouting waterproof layer 2 is not less than 100mm, and the final setting time is about 30 minutes.

[0040] Step 3: If Figure 3 After the grouting waterproof layer 2 has finally set, the grouting waterproof layer template 5 is removed. A 0.1-0.2 mm thick layer of vinyl resin is applied to the inner surface of the grouting waterproof layer within a height range of L3. After the resin has dried, a 0.2-1 mm thick layer of polyurea is applied to form the flexible waterproof layer 3. The flexible waterproof layer 3 and the grouting waterproof layer 2 together form a water barrier.

[0041] Step 4: If Figure 3At the height of L2+L4 above the grouting waterproof layer, the blade foot formwork is erected, the steel bars are tied, and the well wall concrete pouring formwork is erected like the conventional wellbore outer wall construction. Then, the well wall 4 concrete is poured after the formwork is removed. The first section of the well wall with a waterproof layer is formed.

[0042] Step 5: If Figure 4 , excavate the next section, the section height is L3, and again erect the grouting waterproof layer template 5 according to the designed well wall outer diameter + 200mm excavation diameter. The height of the grouting waterproof layer template 5 is L1. Repeat the second step of grouting process to form the second section of high grouting waterproof layer 2. The overlap length of this section of high grouting waterproof layer and the previous section of high grouting waterproof layer is L2.

[0043] Step 6: Remove the grouting waterproofing layer template 5 and apply a 0.1-0.2mm thick layer of vinyl resin to the surface of the second high grouting waterproofing layer within the area L3 and above L4. After the resin solidifies, apply 0.2-1mm thick polyurea. This forms a flexible waterproofing layer 3, ensuring an overlap of L4 between adjacent flexible waterproofing layers 3.

[0044] Step 7: At the height of L2+L4 above the grouting waterproof layer, erect the blade foot formwork, tie the steel bars, erect the well wall formwork and pour the well wall 4 concrete like the conventional wellbore outer wall construction, completing the second section of well wall pouring construction with a height of L=L1-L2-L4.

[0045] Step 8: Repeat steps 5 to 7 to complete the construction of the entire well wall. Figure 5 、 Figure 6 shown.

[0046] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A vertical shaft wall with a complete water-proof layer, characterized by: A vertical shaft wall with a complete waterproof layer is composed of a plurality of upper and lower shaft sections, each of which includes a grouting waterproof layer (2) and a vertical shaft wall (4) sequentially arranged on the side surface (10) of the surrounding rock, wherein the connection between the grouting waterproof layer (2) in the upper and lower adjacent shaft sections is a double-layer staggered overlap structure to improve the sealing performance, and the bottom of the vertical shaft wall (4) at the bottom of each shaft section is cast into a blade foot structure, so that the shaft wall joint (8) formed by the upper and lower adjacent shaft walls (4) can effectively prevent water seepage.

2. The vertical shaft wall with a complete waterproof layer according to claim 1 is characterized in that: A flexible waterproof layer (3) is added between the grouting waterproof layer (2) and the vertical shaft wall (4), and the connection between the flexible waterproof layers (3) of the upper and lower adjacent shaft sections is a double-layer staggered overlap structure.

3. The vertical shaft wall with a complete waterproof layer according to claim 1 is characterized in that: The flexible waterproof layer (3) is located between the grouting waterproof layer (2) and the well wall (4). The flexible waterproof layer (3) needs to ensure that it does not crack within a temperature range of -30°C to 60°C. The material of the flexible waterproof layer is a combination of two or more of resin mortar, resin, polyurea, asphalt, butyl waterproof tape, aluminum foil, and steel foil with a thickness not greater than 0.5 mm.

4. A method for constructing a vertical shaft wall with a complete waterproof layer according to claim 1, characterized in that: A segmented construction method is adopted, and a grouting waterproof layer (2) and a vertical shaft wall (4) are sequentially constructed on the surrounding rock side (10) excavated in each well section to form a complete waterproof layer to prevent water leakage and seepage during construction and production. Grouting and water sealing are not required after the well wall construction. When constructing the vertical shaft wall (4) on the grouting waterproof layer (2), an overlapping section (6) is left. When constructing the grouting waterproof layer (2) of the next well section, the overlapping section is repeatedly constructed to form a double-layer staggered overlapping structure to prevent water seepage at the joints. The well section stratum excavation is repeated until the well wall construction of the entire vertical shaft is completed.

5. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 4, characterized in that: Before constructing the vertical shaft wall (4), a flexible waterproof layer (3) is first constructed on the grouting waterproof layer (2), and then the vertical shaft wall (4) is constructed on the flexible waterproof layer (3). When constructing the vertical shaft wall (4) on the flexible waterproof layer (3), an overlapping section (6) of the flexible waterproof layer (3) of the next well section is left.

6. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 4, characterized in that: The specific steps are as follows: S1. Excavate the well section according to the designed outer diameter of the well wall and add a margin. The excavation depth of the well section includes the height of the well wall construction section and the staggered overlapping sections of the intact waterproof layer between adjacent sections; S2, erecting a grouting waterproof layer template (5) according to the designed outer diameter of the well wall (4) plus 2 times the minimum designed thickness of the grouting waterproof layer, and using a grouting pipe (11) whose outlet is located below the grouting waterproof layer template (5), grouting is performed in the slurry injection space (7) formed between the grouting waterproof layer template (5) and the side surface (10) of the excavated surrounding rock to form a grouting waterproof layer (2), while forming an effective grouting waterproof layer and filling and compacting the over-excavated part by grouting; S3, brushing or pasting waterproof material on the grouting waterproof layer (2) to form a flexible waterproof layer (3), leaving an overlap section (6) below the grouting waterproof layer (2) when spraying or pasting the waterproof material to form the flexible waterproof layer (3), the grouting waterproof layer overlap section (6) has a height of L2, and the flexible waterproof layer (3) and the grouting waterproof layer (2) together form a water-proof layer; when constructing the flexible waterproof layer (3) on the grouting waterproof layer (2), it is necessary to leave an overlap section (6) for the next well section construction of the grouting waterproof layer (2) below the flexible waterproof layer (3), the height of which is L4; S4, according to the inner diameter of the well wall design, the edge foot formwork is erected, the steel bars are tied, and the well wall concrete is poured into the formwork, and then the well wall (4) is poured. When constructing the well wall (4), it is also necessary to leave a lap section (6) for the next well section flexible waterproof layer (3), with a height of L4; after removing the formwork, the construction of the well wall (4) of the current well section is completed; S5, excavate the next well section, repeat steps S2 to S4, connect the well wall (4) in each well section into one, and at the same time form a double-layer staggered overlapping structure on the overlapping section (6) of the grouting waterproof layer (2) and the flexible waterproof layer (3) in each well section until the construction of the entire vertical well wall is completed.

7. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 5, characterized in that: The excavation depth of each well section is L1, which is the sum of the well wall construction depth L3 and the grouting pipe connection margin L2. The height of the blade foot formed by the blade foot template below the well wall (4) from the bottom plate of the current well section is L2+L4. The height L2 of the overlapping section (6) of the adjacent grouting waterproof layer (2) is 50mm~500mm. The outer diameter of the grouting waterproof layer template (5) within the height range of L2 is 10mm~80mm larger than the designed well wall outer diameter. The height L4 of the overlapping section (6) of the adjacent flexible waterproof layer (3) is 50mm~200mm. The overlapping surface needs to be cleaned before overlapping.

8. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 4, characterized in that: Cement slurry, cement-water glass double liquid slurry, and polyurethane grouting materials with an early setting time greater than 5 minutes and a final setting time not greater than 2 hours with an early strength agent are injected into the gap between the grouting waterproofing layer template (5) and the surrounding rock side (10) through the grouting pipe (11); the volume ratio of the cement-water glass double liquid slurry is 1:0.2~1. After excavation, the surrounding rock side (10) will be uneven due to over-excavation. The effective thickness of the grouting waterproofing layer (2) is 30~150mm, and the final setting time is 10~60 minutes. When constructing in the water-bearing stratum (10), a foam board is added between the grouting waterproofing layer (2) and the surrounding rock side (10) as a buffer layer.

9. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 6, characterized in that: The construction process of the flexible waterproof layer (3) is as follows: first, a layer of resin with a thickness of 0.1 to 0.2 mm, generally vinyl resin, is brushed on the inner wall of the grouting waterproof layer (2); after the resin layer is solidified, a layer of polyurea with a thickness of 0.2 to 1 mm is brushed on to form the flexible waterproof layer (3).

10. The method for constructing a vertical shaft wall with a complete waterproof layer according to claim 5, characterized in that: When constructing the well wall (4) of each well section, at the height L2+L4 above the grouting waterproof layer, the blade foot formwork is erected, steel bars are tied, and the well wall concrete pouring formwork is erected, and then concrete is poured to form the well wall (4) with a waterproof layer, just like the conventional wellbore outer wall construction.

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