Ultra-deep diaphragm wall structure and construction method of ultra-deep diaphragm wall structure

Abstract

The invention discloses an ultra-deep anti-seepage wall structure and a construction method of the ultra-deep anti-seepage wall structure, and relates to the field of civil engineering, the ultra-deep anti-seepage wall structure comprises a main anti-seepage wall, the main anti-seepage wall comprises a first main wall section and a second main wall section, and the first main wall section and the second main wall section extend in the first direction and are connected; the connecting wall extends in the second direction, the main anti-seepage wall is connected to the connecting wall in a penetrating mode, and the connecting position of the first main wall section and the second main wall section is located in the connecting wall. Therefore, the main anti-seepage wall is connected to the connecting wall in a penetrating mode, and the connecting position of the first main wall section and the second main wall section is located in the connecting wall, so that the seepage path of the connecting position of the first main wall section and the second main wall section can be prolonged, and the risk that forks and leakage channels occur in the connecting position of the first main wall section and the second main wall section is reduced; the anti-seepage efficiency of the joint of the first main wall section and the second main wall section is remarkably improved, and the continuity and reliability of the ultra-deep anti-seepage wall structure can be improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, and in particular to an ultra-deep seepage barrier structure and a construction method for the ultra-deep seepage barrier structure. Background Technology

[0002] In related technologies, the reliability of seepage prevention at the joints of the cutoff wall is the key to the construction of the cutoff wall. In some ultra-deep cutoff walls with depths exceeding 100 meters or even 200 meters, due to complex geological conditions and limited construction precision, the joints of the cutoff wall sections are prone to forks and leakage channels, which increases the risk of leakage and affects the continuity and reliability of the cutoff wall. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide an ultra-deep cutoff wall structure with good seepage prevention performance, high continuity, and high reliability.

[0004] The present invention further proposes a construction method for an ultra-deep anti-seepage wall structure.

[0005] The ultra-deep cutoff wall structure according to the present invention includes: a main cutoff wall, the main cutoff wall including a first main wall segment and a second main wall segment extending and connected in a first direction; a connecting wall, the connecting wall extending in a second direction, the main cutoff wall passing through and connected to the connecting wall, and the connection between the first main wall segment and the second main wall segment being located inside the connecting wall.

[0006] According to the ultra-deep cutoff wall structure of the present invention, by connecting the main cutoff wall through the connecting wall and placing the connection between the first main wall segment and the second main wall segment inside the connecting wall, the permeation path at the connection between the first main wall segment and the second main wall segment can be extended, reducing the risk of forks and leakage channels at the connection between the first main wall segment and the second main wall segment, significantly improving the cutoff performance at the connection between the first main wall segment and the second main wall segment, and contributing to improving the continuity and reliability of the ultra-deep cutoff wall structure.

[0007] In some examples of the present invention, the second direction is perpendicular to the first direction.

[0008] In some examples of the present invention, the dimension of the connecting wall in the first direction is A, and the dimension of the main seepage barrier wall in the second direction is B, satisfying the relationship: A=B.

[0009] In some examples of the present invention, the dimension of the connecting wall in the second direction is C, which satisfies the relationship: 1.5A≤C≤2A.

[0010] In some examples of the present invention, the connecting surface of the first main wall segment and the second main wall segment coincides with the centerline of the connecting wall.

[0011] In some examples of the present invention, the main seepage barrier wall includes a plurality of first main wall segments and at least one second main wall segment. In the first direction, two adjacent first main wall segments are connected by a second main wall segment, and the size of the second main wall segment is D, satisfying the relationship: 2m≤D≤3m. There are multiple connecting walls, and the connection point between each of the first main wall segment and the second main wall segment is located inside a corresponding connecting wall.

[0012] In some examples of the present invention, the compressive strength of the main impermeable wall is greater than that of the connecting wall.

[0013] In some examples of the present invention, the main seepage barrier is made of ordinary concrete with a compressive strength of 25 MPa to 45 MPa, and the connecting wall is made of plastic concrete with a compressive strength of 3 MPa to 6 MPa.

[0014] According to the construction method of the ultra-deep cutoff wall structure of the present invention, wherein the ultra-deep cutoff wall structure is the aforementioned ultra-deep cutoff wall structure, the construction method includes: The original strata are constructed by trenching the connecting trench, and the connecting wall is poured at the connecting trench. The original stratum and the connecting wall are trenched together to form the first trench. The first main wall segment and the transition connecting segment are cast together at the first trench. The transition connecting segment is located inside the connecting wall. The original stratum and the connecting wall are constructed by forming a second trench. The position of the transition connecting section coincides with a part of the second trench to remove the transition connecting section. The second main wall section is then cast in the second trench.

[0015] Therefore, by connecting the main cutoff wall to the connecting wall and placing the connection between the first and second main wall sections inside the connecting wall, the seepage path at the connection between the first and second main wall sections can be extended, reducing the risk of forks and leakage channels at the connection, significantly improving the seepage prevention efficiency at the connection, and enhancing the continuity and reliability of the ultra-deep cutoff wall structure.

[0016] In some examples of the present invention, the dimension of the main impermeable wall in the third direction is E, and the dimension of the transition connection section in the first direction is F, satisfying the relationship: F≥0.002E.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a top view of the ultra-deep seepage barrier structure according to an embodiment of the present invention; Figure 2 This is a top view of the trenching construction of the connecting groove according to an embodiment of the present invention; Figure 3 This is a top view of the connecting wall casting construction according to an embodiment of the present invention; Figure 4 This is a top view of the first trenching construction according to an embodiment of the present invention; Figure 5 This is a top view of the first main wall segment pouring construction according to an embodiment of the present invention; Figure 6 This is a top view of the second trenching construction according to an embodiment of the present invention; Figure 7 This is a top view of the second main wall segment pouring construction according to an embodiment of the present invention; Figure 8 This is a flowchart of the construction method for an ultra-deep anti-seepage wall structure according to an embodiment of the present invention.

[0019] Figure label: Ultra-deep seepage-proof wall structure 100; Main waterproof wall 10; First main wall section 11; Second main wall section 12; Connecting wall 20; Connecting groove 30; first groove 31; second groove 32; transition connecting section 40; original stratum 50. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-8 The ultra-deep impermeable wall structure 100 according to an embodiment of the present invention is described.

[0022] like Figures 1-8 As shown, the ultra-deep seepage barrier structure 100 according to an embodiment of the present invention includes: a main seepage barrier 10 and a connecting wall 20.

[0023] The main impermeable wall 10 includes the first direction (i.e. Figure 1 The first main wall segment 11 and the second main wall segment 12 extend and connect along the X direction (as shown); the connecting wall 20 extends along the second direction (i.e., Figure 1 Extending in the Y direction (as shown), the main impermeable wall 10 is connected to the connecting wall 20, and the connection between the first main wall section 11 and the second main wall section 12 is located inside the connecting wall 20.

[0024] The ultra-deep cutoff wall structure 100 of this application can be applied to riverbeds with depths exceeding 100 meters, or even 200 meters. This application will use the application of the ultra-deep cutoff wall structure 100 to a riverbed with a depth of 200 meters as an example for illustration, and will not be elaborated further below.

[0025] The main impermeable wall 10 includes a first main wall section 11 and a second main wall section 12, both of which are along a first direction (i.e., Figure 1 The wall extends in the X direction as shown, and the first main wall segment 11 and the second main wall segment 12 are connected. As some embodiments of this application, the first main wall segment 11 and the second main wall segment 12 are connected by concrete pouring.

[0026] Connecting wall 20 along the second direction (i.e. Figure 1 Extending in the Y direction (as shown), the main anti-seepage wall 10 is connected to the connecting wall 20. As some embodiments of this application, the connecting wall 20 is formed with a through groove, and the main anti-seepage wall 10 can be inserted into the through groove so that the main anti-seepage wall 10 is inserted into the connecting wall 20. Furthermore, the main anti-seepage wall 10 and the connecting wall 20 are connected and arranged.

[0027] The connection between the first main wall segment 11 and the second main wall segment 12 is located inside the connecting wall 20. That is, the connecting wall 20 is located at the connection between the first main wall segment 11 and the second main wall segment 12. As some embodiments of this application, the connection between the first main wall segment 11 and the second main wall segment 12 is located in the through groove.

[0028] It should be noted that by positioning the connection between the first main wall segment 11 and the second main wall segment 12 within the connecting wall 20, it is possible to extend along the second direction (i.e., Figure 1 (As shown in the Y direction) Extend the seepage path at the connection between the first main wall segment 11 and the second main wall segment 12, reduce the risk of forking and leakage at the connection between the first main wall segment 11 and the second main wall segment 12, and reduce the construction difficulty of the ultra-deep anti-seepage wall structure 100, significantly improve the continuity of the first main wall segment 11 and the second main wall segment 12, and improve the connection quality of the first main wall segment 11 and the second main wall segment 12.

[0029] Therefore, by connecting the main cutoff wall 10 to the connecting wall 20 and placing the connection between the first main wall segment 11 and the second main wall segment 12 inside the connecting wall 20, the seepage path at the connection between the first main wall segment 11 and the second main wall segment 12 can be extended, reducing the risk of forks and leakage channels at the connection between the first main wall segment 11 and the second main wall segment 12. This significantly improves the seepage prevention efficiency at the connection between the first main wall segment 11 and the second main wall segment 12, and is beneficial to improving the continuity and reliability of the ultra-deep cutoff wall structure 100.

[0030] In some embodiments of the present invention, such as Figure 1 As shown, the second direction (i.e. Figure 1 The Y direction shown) and the first direction (i.e. Figure 1 The X direction shown is perpendicular to the main anti-seepage wall 10, that is, the extension direction of the main anti-seepage wall 10 is perpendicular to the extension direction of the connecting wall 20. This can extend the seepage path at the connection between the first main wall section 11 and the second main wall section 12 from the seepage direction, and improve the anti-seepage performance of the ultra-deep anti-seepage wall structure 100.

[0031] In some embodiments of the present invention, such as Figure 1 As shown, the dimension of the connecting wall 20 in the first direction is A, and the dimension of the main anti-seepage wall 10 in the second direction is B, satisfying the relationship: A=B.

[0032] In other words, the connecting wall 20 in the first direction (i.e. Figure 1 The dimension A in the X direction (as shown) and the main cutoff wall 10 in the second direction (i.e. Figure 1 The dimension B of the connecting wall 20 in the Y direction (as shown) satisfies the relationship: A=B, that is, the dimension B in the first direction (i.e., the dimension B in the Y direction) satisfies the relationship: A=B, that is, the dimension B in the connecting wall 20 ... Y direction satisfies Figure 1 The dimension A in the X direction (as shown) and the dimension A of the cutoff wall in the second direction (i.e. Figure 1 The dimension B in the Y direction (as shown) is equal.

[0033] This arrangement allows the connecting wall 20 to be positioned along the first direction (i.e. Figure 1 The dimensions (in the X direction shown) are reasonable, which significantly improves the structural strength of the connecting wall 20 and allows the connection between the first main wall segment 11 and the second main wall segment 12 to be located inside the connecting wall 20, thereby significantly extending the seepage path and improving the seepage prevention performance of the ultra-deep anti-seepage wall structure 100.

[0034] In some embodiments of the present invention, such as Figure 1 As shown, the connecting wall 20 is in the second direction (i.e. Figure 1 The dimension in the Y direction (as shown) is C, which satisfies the relationship: 1.5A≤C≤2A.

[0035] In other words, the connecting wall 20 is in the second direction (i.e. Figure 1 The dimension C in the Y direction (as shown) and the connecting wall 20 in the first direction (i.e. Figure 1 The dimension A in the X direction (as shown) satisfies the relationship: 1.5A≤C≤2A, that is, the dimension C of the connecting wall 20 in the second direction is greater than or equal to 1.5 times the dimension A of the connecting wall 20 in the first direction and less than or equal to 2 times the dimension A of the connecting wall 20 in the first direction.

[0036] This arrangement allows the connecting wall 20 to be positioned along the second direction (i.e. Figure 1 The dimensions (shown in the Y direction) are reasonable, which significantly improves the structural strength of the connecting wall 20, extends the seepage path of the main anti-seepage wall 10, and is conducive to improving the anti-seepage performance of the ultra-deep anti-seepage wall structure 100.

[0037] In some embodiments of the present invention, such as Figure 1 As shown, the connection surface of the first main wall segment 11 and the second main wall segment 12 coincides with the center line of the connecting wall 20.

[0038] Among them, the connecting wall 20 has a centerline, which is along the second direction (i.e. Figure 1 Extending in the Y direction (as shown), the connecting wall 20 is symmetrical about the center line, and the connecting surface of the first main wall segment 11 and the second main wall segment 12 coincides with the center line of the connecting wall 20.

[0039] This arrangement ensures that the contact area between the first main wall segment 11, the second main wall segment 12 and the connecting wall 20 is the same, making the stress on the first main wall segment 11, the second main wall segment 12 and the connecting wall 20 uniform. Furthermore, it can extend the seepage path of the first main wall segment 11 and the second main wall segment 12, which is beneficial to improving the seepage prevention performance of the ultra-deep anti-seepage wall structure 100.

[0040] In some embodiments of the present invention, such as Figure 1 As shown, the main seepage barrier 10 includes multiple first main wall segments 11 and at least one second main wall segment 12. In the first direction, two adjacent first main wall segments 11 are connected by a second main wall segment 12, and the size of the second main wall segment 12 is D, which satisfies the relationship: 2m≤D≤3m. There are multiple connecting walls 20, and the connection between each first main wall segment 11 and the second main wall segment 12 is located inside a corresponding connecting wall 20.

[0041] The main anti-seepage wall 10 includes multiple first main wall segments 11 and at least one second main wall segment 12. That is, the main anti-seepage wall 10 includes multiple first main wall segments 11 and one second main wall segment 12, or the main anti-seepage wall 10 includes multiple first main wall segments 11 and multiple second main wall segments 12.

[0042] In the first direction, two adjacent first main wall segments 11 are connected by a second main wall segment 12. As some embodiments of this application, the main seepage barrier 10 includes multiple first main wall segments 11 and multiple second main wall segments 12, along the first direction (i.e. Figure 1 (As shown in the X direction), two adjacent first main wall segments 11 are connected by a second main wall segment 12.

[0043] Along the first direction (i.e.) Figure 1 (As shown in the X direction), the size D of the second main wall segment 12 satisfies the relationship 2m≤D≤3m. That is, the size D of the second main wall segment 12 can be any value between 2m and 3m. The size D of the second main wall segment 12 can be, but is not limited to, 2m, 2.5m, 3m, etc. As some embodiments of this application, the size D of the second main wall segment 12 is 2.5m.

[0044] There are multiple connecting walls 20. The connection point of each first main wall segment 11 and second main wall segment 12 is located inside a corresponding connecting wall 20. That is, the connecting wall 20 is located at the connection point of each first main wall segment 11 and second main wall segment 12, and the center distance between the two connecting walls 20 at the two ends of the second main wall segment 12 is also D.

[0045] By ensuring that the connection points of each first main wall segment 11 and second main wall segment 12 are located inside the corresponding connecting wall 20, the seepage prevention performance of the overall ultra-deep seepage-proof wall structure 100 can be improved. Furthermore, by allowing the dimension D of the second main wall segment 12 to be any value between 2m and 3m, the second main wall segment 12 can have good rigidity and verticality, making it easier to match with high-precision equipment, which helps to reduce construction difficulty and improve construction efficiency.

[0046] Furthermore, by allowing the dimension D of the second main wall segment 12 to be any value between 2m and 3m, when the connection between the first main wall segment 11 and the second main wall segment 12 fails, only the connection of the second main wall segment 12 needs to be repaired, which can improve the convenience of subsequent maintenance of the ultra-deep anti-seepage wall structure.

[0047] In some embodiments of the present invention, the compressive strength of the main cutoff wall 10 is greater than that of the connecting wall 20. This arrangement enables the main cutoff wall 10 to have good strength and rigidity to resist water pressure and osmotic pressure, and enables the connecting wall 20 to have good plastic deformation capacity at the connection, better absorbing stress changes at the connection, thereby reducing the probability of through cracks appearing in the main cutoff wall 10. Furthermore, by making the compressive strength of the connecting wall 20 lower, it is easier to drill the connecting wall 20 and facilitate trenching.

[0048] In some embodiments of the present invention, the main cutoff wall 10 is made of ordinary concrete with a compressive strength of 25 MPa to 45 MPa, and the connecting wall 20 is made of plastic concrete with a compressive strength of 3 MPa to 6 MPa. This arrangement enables the main cutoff wall 10 to have good strength and rigidity to resist water pressure and osmotic pressure, and enables the connecting wall 20 to have good plastic deformation capacity at the connection point, better absorbing the stress at the connection point, thereby reducing the probability of through cracks in the main cutoff wall 10, improving the seepage prevention safety redundancy of the ultra-deep cutoff wall structure 100, and facilitating subsequent drilling of the connecting wall 20, which is beneficial to improving construction efficiency and saving construction time.

[0049] The construction method of the ultra-deep seepage barrier wall structure according to embodiments of the present invention, such as... Figures 1-8 As shown, the ultra-deep cutoff wall structure is the ultra-deep cutoff wall structure described in the above embodiment, and the construction method includes: S1, construct the trench for the connection groove in the original stratum, and pour the connection wall at the connection groove; As some embodiments of this application, before constructing the ultra-deep anti-seepage wall structure 100, construction preparation work needs to be carried out. First, the original stratum 50 is leveled, and then the construction of the guide wall (not shown in the figure), the construction of the operating platform, the construction of the slurry preparation station, the construction of the slurry circulation system such as the mud pit, the slurry storage pit, and the waste slurry pit, as well as the laying of slurry supply and return pipelines are carried out in sequence.

[0050] As some embodiments of this application, the operating platform, as the main load-bearing body of the construction equipment for the ultra-deep anti-seepage wall structure 100, generally has a thickness of 0.4 to 0.6 m, and the concrete compressive strength of the operating platform is generally 25 MPa to 30 MPa.

[0051] As some embodiments of this application, slurry circulation systems such as mud pits, slurry storage pits, and waste slurry pits can be constructed by underground excavation or by surface laying.

[0052] As some embodiments of this application, the trenching of the connecting trench 30 can be carried out on the original stratum 50 using construction equipment such as impact drilling rigs, rotary drilling rigs, hydraulic grab buckets and twin-wheel trenching machines. The dimensions of the connecting trench 30 along the first direction and the dimensions along the second direction are the same as those of the connecting wall 20, so as to facilitate the casting of the connecting wall 20 at the connecting trench 30.

[0053] As some embodiments of this application, after the construction of the connecting groove 30 is completed, the final hole acceptance, hole cleaning and slurry replacement, and hole cleaning acceptance are carried out. After the hole cleaning acceptance is qualified, a set of pouring pipes is installed in the connecting groove 30, and the concrete of the connecting wall 20 is poured using the mud slurry vertical pipe method. It can be understood that the concrete material for pouring the connecting wall 20 is plastic concrete with a compressive strength of 3 MPa to 6 MPa.

[0054] S2, the first trench is constructed for the original strata and the connecting wall. The first main wall segment and the transition connecting segment are poured in one piece at the first trench. The transition connecting segment is located inside the connecting wall. As some embodiments of this application, the main-secondary hole method is used to construct the first trench 31 between the original stratum 50 and the connecting wall 20. The main hole processing equipment can be, but is not limited to, impact drilling rigs, rotary drilling rigs, twin-wheel trenching machines, etc., and the secondary hole processing equipment can be, but is not limited to, hydraulic grab buckets, twin-wheel trenching machines, etc.

[0055] It should be noted that during the trenching construction of the first trench 31, along the first direction (i.e. Figure 1 After drilling to the midline of the connecting wall 20 in the X direction (as shown), it is necessary to continue drilling the plastic concrete of the connecting wall 20 with a length of transition connecting section 40.

[0056] As some embodiments of this application, the main seepage barrier 10 includes a plurality of first main wall segments 11 and at least one second main wall segment 12. Along the first direction, two adjacent first main wall segments 11 are connected by a second main wall segment 12. A plurality of connecting walls 20 are provided at the connection between the first main wall segments 11 and the second main wall segments 12. The first grooves 31 at both ends only need to be drilled toward one side to drill the connecting walls 20, while the first grooves 31 in the middle need to be drilled toward both sides to drill the connecting walls 20.

[0057] As some embodiments of this application, after the trenching construction of the first trench 31 is completed, final hole acceptance, hole cleaning and slurry replacement, hole cleaning acceptance and other work are carried out. After the hole cleaning acceptance is qualified, 2 to 3 sets of pouring pipes are set into the first trench 31, and the concrete of the first trench 31 is poured using the mud slurry vertical pipe method. It can be understood that the poured concrete material is ordinary concrete with a compressive strength of 25 MPa to 45 MPa.

[0058] S3, construct the second trench for the original strata and connecting wall. The location of the transition connection section overlaps with part of the second trench to remove the transition connection section. The second main wall section is then poured in the second trench.

[0059] In other words, the second trench 32 includes a transition connection section 40. During the trenching construction of the second trench 32, along the first direction (i.e. Figure 1 After drilling to the transition connection section 40 in the X direction (as shown), it is necessary to continue drilling away the concrete of the transition connection section 40 to the center line of the connecting wall 20, so that the connection between the first main wall section 11 and the second main wall section 12 is located at the center line of the connecting wall 20, that is, the second groove 32 is along the first direction (i.e., Figure 1 The length dimension (in the X direction shown) is D. This setting facilitates equipment matching for the trenching construction of the second trench 32, which helps to improve construction efficiency and reduce construction costs.

[0060] As some embodiments of this application, a twin-wheel grooving machine is used for the grooving construction of the second groove 32.

[0061] As some embodiments of this application, after the trenching construction of the second trench 32 is completed, final hole acceptance, hole cleaning and slurry replacement, hole cleaning acceptance and other work are carried out. After the hole cleaning acceptance is qualified, a set of pouring pipes is set up in the second trench 32, and the concrete of the second trench 32 is poured using the mud slurry vertical pipe method. It can be understood that the poured concrete material is ordinary concrete with a compressive strength of 25 MPa to 45 MPa.

[0062] As some embodiments of this application, the guide wall is located on both sides of the original stratum 50 of the first trench 31 and the original stratum 50 of the second trench 32. The guide wall can provide guidance for the equipment for trenching construction, ensure the geometric dimensions and shape of the ultra-deep anti-seepage wall structure 100, and also store mud and prevent the trench opening soil wall from collapsing.

[0063] Depending on the geological conditions at the construction site, the guide wall can be constructed in, but is not limited to, a rectangle, a right-angled trapezoid, or an L-shape, and the compressive strength of the guide wall concrete can be 30MPa to 35MPa.

[0064] As some embodiments of this application, after construction is completed, the construction quality of the ultra-deep anti-seepage wall structure 100 can be inspected. Core samples can be taken by drilling at the connection between the first main wall section 11 and the second main wall section 12. The construction quality of the ultra-deep anti-seepage wall structure 100 can be evaluated and inspected by indicators such as core sample strength and core sample integrity.

[0065] Therefore, according to the construction method of the ultra-deep cutoff wall structure of the present invention, by connecting the main cutoff wall 10 through the connecting wall 20 and placing the connection between the first main wall segment 11 and the second main wall segment 12 inside the connecting wall 20, the seepage path at the connection between the first main wall segment 11 and the second main wall segment 12 can be extended, reducing the risk of forks and leakage channels at the connection between the first main wall segment 11 and the second main wall segment 12, significantly improving the seepage prevention efficiency at the connection between the first main wall segment 11 and the second main wall segment 12, and helping to improve the continuity and reliability of the ultra-deep cutoff wall structure 100.

[0066] In some embodiments of the present invention, such as Figure 5 As shown, the dimension of the main cutoff wall in the third direction is E (not shown in the figure), and the dimension of the transition connection section in the first direction is F, satisfying the relationship: F≥0.002E.

[0067] The third direction can be understood as the depth direction of the main anti-seepage wall 10. That is, the dimension E of the main anti-seepage wall 10 in the third direction and the dimension F of the transition connection section 40 in the first direction satisfy the relationship: F≥0.002E, that is, the dimension F in the first direction is greater than or equal to 0.002 times the dimension E of the main anti-seepage wall 10 in the third direction.

[0068] This design can reduce the probability of misalignment between the first groove 31 and the second groove 32, reduce the risk of poor connection, loose joints, and discontinuous wall structure in the first main wall segment 11 and the second main wall segment 12, and help improve the reliability of the connection between the first main wall segment 11 and the second main wall segment 12.

[0069] As some embodiments of this application, before constructing the ultra-deep anti-seepage wall structure 100, construction preparation work is required. First, the original stratum 50 is leveled. Then, the construction of the guide wall, the operating platform, the slurry preparation station, the mud pit, the slurry storage pit, the waste slurry pit and other slurry circulation system, the slurry supply, and the slurry return pipeline are carried out in sequence. Next, on the original stratum 50, construction equipment such as impact drilling rigs, rotary drilling rigs, hydraulic grab buckets and double wheel trenching machines can be used to construct the connecting trench 30. The dimensions of the connecting trench 30 along the first direction and the dimensions along the second direction are the same as those of the connecting wall 20, so as to facilitate the casting of the connecting wall 20 at the connecting trench 30.

[0070] After the construction of the connecting groove 30 is completed, the final hole acceptance, hole cleaning and slurry replacement, and hole cleaning acceptance are carried out. After the hole cleaning acceptance is qualified, a set of pouring pipes is installed in the connecting groove 30, and the concrete of the connecting wall 20 is poured using the mud slurry vertical pipe method. It can be understood that the concrete material for pouring the connecting wall 20 is plastic concrete with a compressive strength of 3 MPa to 6 MPa.

[0071] Next, the main-secondary borehole method was used to construct the first trench 31 between the original stratum 50 and the connecting wall 20. During the construction of the first trench 31, the trench was constructed along the first direction (i.e., Figure 1 After drilling to the midline of the connecting wall 20 in the X direction (as shown), it is necessary to continue drilling the plastic concrete of the connecting wall 20 with a length of transition connecting section 40.

[0072] After the trenching of the first trench 31 is completed, the final hole acceptance, hole cleaning and slurry replacement, and hole cleaning acceptance are carried out. After the hole cleaning acceptance is qualified, 2 to 3 sets of pouring pipes are lowered into the first trench 31, and the concrete of the first trench 31 is poured using the mud slurry vertical pipe method. It can be understood that the concrete material is ordinary concrete with a compressive strength of 25 MPa to 45 MPa.

[0073] Next, trenching construction of the second trench 32 is carried out on the original stratum 50 and the connecting wall 20. The second trench 32 includes a transition connecting section 40. During the trenching construction of the second trench 32, along the first direction (i.e. Figure 1 After drilling to the transition connection section 40 in the X direction (as shown), it is necessary to continue drilling away the concrete of the transition connection section 40 to the center line of the connecting wall 20 so that the connection between the first main wall section 11 and the second main wall section 12 is located at the center line of the connecting wall 20.

[0074] After the second trench 32 is completed, the final hole acceptance, hole cleaning and slurry replacement, and hole cleaning acceptance are carried out. After the hole cleaning acceptance is qualified, a set of pouring pipes is installed in the second trench 32, and the concrete of the second trench 32 is poured using the mud slurry vertical riser method. It can be understood that the concrete material is ordinary concrete with a compressive strength of 25 MPa to 45 MPa.

[0075] Finally, after construction is completed, the construction quality of the ultra-deep cutoff wall structure 100 can be inspected. Core samples can be taken by drilling at the connection between the first main wall section 11 and the second main wall section 12. The construction quality of the ultra-deep cutoff wall structure 100 can be evaluated and accepted by indicators such as core sample strength and core sample integrity.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0078] In the description of this invention, "a plurality of" means two or more.

[0079] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0080] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An ultra-deep seepage-proof wall structure, characterized in that, include: The main cutoff wall includes a first main wall segment and a second main wall segment extending and connected in a first direction; A connecting wall extends along a second direction, and the main impermeable wall passes through and connects to the connecting wall, with the connection point between the first main wall segment and the second main wall segment located inside the connecting wall.

2. The ultra-deep seepage barrier structure according to claim 1, characterized in that, The second direction is perpendicular to the first direction.

3. The ultra-deep seepage barrier structure according to claim 2, characterized in that, The dimension of the connecting wall in the first direction is A, and the dimension of the main seepage barrier wall in the second direction is B, satisfying the relationship: A=B.

4. The ultra-deep seepage-proof wall structure according to claim 3, characterized in that, The dimension of the connecting wall in the second direction is C, which satisfies the relationship: 1.5A≤C≤2A.

5. The ultra-deep seepage-proof wall structure according to claim 4, characterized in that, The connection surface between the first main wall segment and the second main wall segment coincides with the centerline of the connecting wall.

6. The ultra-deep seepage-proof wall structure according to claim 5, characterized in that, The main seepage barrier wall includes multiple first main wall segments and at least one second main wall segment. In the first direction, two adjacent first main wall segments are connected by a second main wall segment, and the size of the second main wall segment is D, which satisfies the relationship: 2m≤D≤3m. There are multiple connecting walls, and the connection point between each of the first main wall segment and the second main wall segment is located inside a corresponding connecting wall.

7. The ultra-deep seepage barrier structure according to any one of claims 1-6, characterized in that, The compressive strength of the main impermeable wall is greater than that of the connecting wall.

8. The ultra-deep seepage-proof wall structure according to claim 7, characterized in that, The main seepage barrier is made of ordinary concrete with a compressive strength of 25 MPa to 45 MPa, and the connecting wall is made of plastic concrete with a compressive strength of 3 MPa to 6 MPa.

9. A construction method for an ultra-deep seepage-proof wall structure, characterized in that, The ultra-deep cutoff wall structure is the ultra-deep cutoff wall structure according to any one of claims 1-8, and the construction method includes: The original strata are constructed by trenching the connecting trench, and the connecting wall is poured at the connecting trench. The original stratum and the connecting wall are trenched together to form the first trench. The first main wall segment and the transition connecting segment are cast together at the first trench. The transition connecting segment is located inside the connecting wall. The original stratum and the connecting wall are constructed by forming a second trench. The position of the transition connecting section coincides with a part of the second trench to remove the transition connecting section. The second main wall section is then cast in the second trench.

10. The construction method of the ultra-deep seepage-proof wall structure according to claim 9, characterized in that, The main impermeable wall has a dimension of E in the third direction, and the transition connection section has a dimension of F in the first direction, satisfying the relationship: F≥0.002E.

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