Well pit water-intercepting and soil-retaining parapet wall structure

Abstract

The invention discloses a well pit water interception and soil retaining parapet wall structure, and relates to the technical field of well pit water interception construction. A well pit water-intercepting and soil-retaining parapet wall structure comprises a plurality of steel sheet piles which are spliced in a meshed mode, each steel sheet pile comprises a bottom plate and side plates connected with the two ends of the bottom plate respectively, meshing buckles are arranged on the side plates, and each meshing buckle comprises a first frame plate, a second frame plate and a filling meshing connecting assembly, and the first frame plate, the second frame plate and the side plates are continuously formed. The meshing buckles between the adjacent steel sheet piles are meshed with each other; the arc surface clinging design is adopted for structures such as the first inner wall arc surface / second inner wall arc surface between the side plate and the first frame plate, the first inner wall arc surface / second inner wall arc surface between the first frame plate and the second frame plate, the outer wall of the first water interception arc part / second water interception semi-arc part, the first inner folded plate arc surface / second inner folded plate arc surface and the like, traditional right-angle splicing is replaced, continuous sealing can be achieved through an arc interface, and gaps easily generated by right-angle splicing are eliminated; and the external expansion arc parts form pre-pressure through mutual extrusion, so that the fitting sealing performance is further improved, and the watertight effect can be realized without depending on an external sealing strip.

Description

Technical Field

[0001] This invention belongs to the field of well pit water interception construction technology, specifically, it relates to a well pit water interception retaining wall structure. Background Technology

[0002] A cutoff wall is a vertical, curtain-like water-cutting protective structure used to block or reduce the flow of groundwater into a well pit through its sidewalls. Construction methods for cutoff walls include high-pressure jet grouting, diaphragm walls, small-toothed steel sheet piles, and deep cement-soil mixing piles.

[0003] Among them, sheet pile curtain refers to the support structure formed by driving sheet piles into the soil around the pit and setting necessary supports or anchors to resist soil and water pressure and maintain the stability of the surrounding strata. There are various structures of sheet piles, with U-shaped Larssen sheet piles being the most common.

[0004] Larssen sheet piles consist of a U-shaped pile body and interlocking clips on both sides of the pile body, with adjacent sheet piles interlocked. Sheet pile curtains serve a water-blocking function; however, the current design of the Larssen sheet pile interlocking structure results in gaps between the clips, allowing water to enter the pit through these gaps.

[0005] In the prior art, publication number CN116180786A, entitled "Water-Cutting Curtain Structure and Construction Method Thereof," relates to the technical field of foundation pit construction. The water-cutting curtain structure includes multiple interconnected steel sheet piles. Each steel sheet pile includes a U-shaped pile body and locking buckles connected to both ends of the pile body. Each locking buckle includes a connecting part connected to the pile body and a buckle body connected to the connecting part. The outer surface of each buckle body includes sequentially adjacent inclined surfaces, a water-cutting surface, and a water-entry surface. The inclined surfaces of two adjacent buckle bodies are in contact with each other. The water-cutting surface is in contact with the connecting part of the adjacent locking buckle. There is a water-entry gap between the water-entry surface and the adjacent pile body. A sealing groove is provided at the water-cutting surface of each buckle body, and a sealing strip is provided within the sealing groove. A water-entry hole is provided at the water-entry surface of each buckle body, and the water-entry hole communicates with the sealing groove. This application provides sealing strips at the seepage path, and the greater the external water pressure, the better the sealing effect, effectively improving the water-cutting effect of the curtain structure. However, this technical solution still has significant limitations in practical engineering applications, making it difficult to simultaneously meet the comprehensive requirements of "sealing reliability, ease of construction, and cost-effectiveness." Specific problems are as follows: 1. The sealing reliability depends on a single component, which is at risk of failure. The core sealing function of this solution is entirely undertaken by the sealing strip. If the sealing strip is damaged during transportation or construction, or is aged due to long-term erosion by groundwater or compression by soil, it will directly lead to a sharp drop in sealing performance and fail to form a lasting and stable water interception effect. 2. The construction process is complex, increasing costs and time. To prevent the sealing strip from wearing out during the interlocking process, additional baffles are required for protection. The baffles are removed after the adjacent sheet piles are interlocked. This extra step not only increases the material cost of the baffles but also extends the construction period and reduces the splicing efficiency. 3. The locking mechanism is difficult to process and has poor economic efficiency. The width of the locking body in the design is greater than the thickness of the steel sheet pile body, which makes it impossible for the locking mechanism to be formed synchronously with the pile body. It is necessary to achieve the design shape through secondary processing (such as additional cutting, welding or cold pressing), which significantly increases the processing cost and production cycle of the steel sheet pile. Summary of the Invention

[0006] The purpose of this invention is to provide a well pit water interception and retaining wall structure to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: a well pit water interception and retaining wall structure, comprising multiple interlocking steel sheet piles, wherein each steel sheet pile includes a base plate and side plates respectively connected to both ends of the base plate, and interlocking buckles are provided on the side plates, wherein the interlocking buckles include a first frame plate and a second frame plate continuously formed with the side plates, and a filling interlocking connection assembly; after the interlocking buckles between adjacent steel sheet piles interlock with each other, a rectangular interlocking area is formed between two adjacent steel sheet piles through the first frame plate, the second frame plate, and the filling interlocking connection assembly, and at least two chambers are formed in the rectangular interlocking area.

[0008] Preferably, the angle between the side plate and the bottom plate is greater than 90°, the angle between the first frame plate and the side plate is greater than 90°, and the first frame plate is located on the side of the side plate away from the bottom plate, the second frame plate is perpendicular to the first frame plate, and the second frame plate is located on the opposite side of the side plate.

[0009] Preferably, the filling interlocking connection assembly includes a water-cutting arc portion integrally formed with the second frame plate, an inner wall arc surface is provided between the side plate and the first frame plate, the outer wall of the water-cutting arc portion is in close contact with the inner wall of the first inner wall arc surface, and the outer walls of the two water-cutting arc portions located in the rectangular interlocking area are in contact with each other, the chamber includes an O-shaped chamber and a secondary chamber formed by the water-cutting arc portion in the rectangular interlocking area; a redundant area is left between one end of the water-cutting arc portion and the second frame plate; wherein, the two water-cutting arc portions in the rectangular interlocking area are staggered and interlocked.

[0010] Preferably, the filling interlocking connection assembly includes a water-cutting semi-circular portion one integrally formed with the frame plate two, and an inner wall arc surface one is provided between the side plate and the frame plate one. The outer wall of the water-cutting semi-circular portion one is in close contact with the inner wall of the inner wall arc surface one. An outwardly expanding arc portion is integrally formed on the water-cutting semi-circular portion one. The radius of the outwardly expanding arc portion is larger than the radius of the water-cutting semi-circular portion one, so that the two outwardly expanding arc portions in the rectangular interlocking area are close to each other. The chamber includes a g-shaped chamber formed in the rectangular interlocking area by the water-cutting semi-circular portion one, the outwardly expanding arc portion, and the frame plate two. A redundant area is left between one end of the outwardly expanding arc portion and the frame plate two. The two water-cutting semi-circular portions one in the rectangular interlocking area are staggered and interlocked.

[0011] Preferably, the filling interlocking connection assembly includes a water-cutting semi-circular portion two integrally formed with the frame plate two; an inner wall arc surface one is provided between the side plate and the frame plate one; the outer wall of the water-cutting semi-circular portion two is in close contact with the inner wall of the inner wall arc surface one; a straight portion is integrally formed on the water-cutting semi-circular portion two; the straight portion is perpendicular to the line connecting the centers of the two water-cutting semi-circular portions two in the rectangular interlocking area; the chamber includes a teardrop-shaped chamber formed in the rectangular interlocking area by the water-cutting semi-circular portion two, the straight portion, and the frame plate two; a redundant area is left between one end of the straight portion and the frame plate two; wherein, the two water-cutting semi-circular portions two in the rectangular interlocking area are staggered and interlocked.

[0012] Preferably, the filling interlocking connection assembly includes an inner folded plate 1 integrally formed with the second frame plate; an inner wall arc surface 1 is provided between the side plate and the first frame plate; an inner folded plate arc surface 1 is formed between the second frame plate and the first inner folded plate; the outer wall of the inner folded plate arc surface 1 is in close contact with the inner wall of the inner wall arc surface 1; an inner folded plate 2 is integrally formed on the first inner folded plate; a straight plate 1 is integrally formed on the second inner folded plate; the connection between the straight plate 1 and the center of the two inner folded plate arc surfaces 1 in the rectangular interlocking area is perpendicular; the outer walls of the two straight plates 1 are in close contact; the chamber includes a U-shaped chamber formed in the rectangular interlocking area by the second frame plate, the first inner folded plate, the second inner folded plate, and the straight plate 1; a redundant area is left between one end of the straight plate 1 and the second frame plate; wherein, the two inner folded plates 2 and the straight plate 1 in the rectangular interlocking area are staggered and interlocked.

[0013] Preferably, the filling interlocking connection assembly includes an inner folded plate one integrally formed with the frame plate two, an inner folded plate arc surface one formed between the frame plate two and the inner folded plate one, an inner folded plate two integrally formed on the inner folded plate one, an inner folded plate arc surface two provided between the inner folded plate one and the inner folded plate two, an inner wall arc surface one provided between the side plate and the frame plate one, an inner wall arc surface two provided between the frame plate one and the frame plate two, and the outer wall of the inner folded plate arc surface one and the inner wall of the inner wall arc surface one... The outer wall of the inner folded plate arc surface two is tightly attached to the inner wall of the inner folded plate arc surface two; a straight plate two is integrally formed on the inner folded plate two, the straight plate two is parallel to the bottom plate, and the outer walls of the two straight plates two in the rectangular biting area are tightly attached; the cavity includes a U-shaped cavity e formed in the rectangular biting area by the frame plate two, the inner folded plate one, the inner folded plate two, and the straight plate two; a redundant area is left between one end of the straight plate two and the frame plate two; wherein, the two straight plates two in the rectangular biting area are horizontally biting.

[0014] Furthermore, a buffer element is provided in the chamber.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. In this well pit water-cutting retaining wall structure, within the rectangular interlocking area formed by the interlocking of adjacent sheet piles, at least two independent chambers are constructed by filling interlocking connecting components (water-cutting arc section, water-cutting semi-arc section one / two, inner folded plate one / two, straight plate one / two, etc.) to create O-shaped chambers, G-shaped chambers, teardrop-shaped chambers, figure-9 shaped chambers, and U-shaped chambers. This multi-chamber design extends the seepage path and disperses water pressure: even if a single chamber experiences slight seepage, other chambers can still intercept the water flow; simultaneously, the chambers can accommodate small amounts of seepage and reduce seepage pressure through overflow, completely avoiding the risk of "leakage at the slightest crack" in traditional chamberless structures.

[0016] 2. The well pit water interception and retaining wall structure adopts a curved surface close-fitting design for the inner wall arc surfaces one / two between the side plates and frame plate one, the outer wall of the water interception arc part / water interception semi-arc part one / two, and the inner folded plate arc surface one / two, etc., replacing the traditional right angle splicing: the arc interface can achieve continuous sealing and eliminate the gaps that are easy to be generated by right angle splicing; the outwardly expanded arc part forms pre-pressure through mutual compression, further improving the fit and sealing performance, and can achieve watertight effect without relying on external sealing strips.

[0017] 3. The water-cutting retaining wall structure of the well pit adopts staggered interlocking or horizontal interlocking for the water-cutting arc section, water-cutting semi-arc section I / II, inner folded plate I / II, and straight plate I / II within the rectangular interlocking area: staggered interlocking transforms straight gaps into tortuous paths, increasing seepage resistance; horizontal interlocking is designed to address the stress characteristics of the well pit sidewall, ensuring complete horizontal fit and preventing new gaps caused by angular deviations, thus cutting off the possibility of water seepage from the path design.

[0018] 4. The retaining wall structure for the well pit water interception, with the rigid frame formed by frame plate one and frame plate two, can evenly distribute the interlocking pressure and reduce local gaps; at the same time, the redundant area reserved between the interlocking connection component and frame plate two can provide elastic space for steel sheet pile interlocking displacement, uneven ground settlement or construction errors, avoid structural deformation caused by rigid contact, and take into account both long-term stability and dynamic adaptability.

[0019] 5. The retaining wall structure of the well pit has a design where straight plate one and straight plate two are tightly attached to each other on their outer walls to increase the interlocking interface area: when the steel sheet pile is under force and moves to the adjacent pile body, the interlocking area of ​​straight plate one and straight plate two will gradually increase, and the interlocking force will increase with the increase of force, further enhancing the water-proof performance and avoiding the expansion of gaps caused by force.

[0020] 6. The retaining wall structure for the well pit water interception adopts a continuous molding or integral molding process for the rectangular interlocking area, the steel sheet pile side plate, and the bottom plate, without the need for secondary welding or assembly; at the same time, there is no need to install additional auxiliary components such as sealing strips and protective baffles, which greatly simplifies the manufacturing and splicing process and reduces the processing difficulty and construction time cost.

[0021] 7. The well pit water interception and retaining wall structure uses a self-sealing structure to replace the traditional sealing strip, avoiding frequent replacements due to aging and wear of the sealing strip; all core components are one-piece metal structures, which are highly durable and do not require frequent inspection or replacement of vulnerable parts during long-term use, reducing later maintenance costs.

[0022] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of a well pit water interception and retaining wall structure proposed in this invention. Figure 1 ; Figure 2 This is a top view of a well pit water interception and retaining wall structure proposed in this invention. Figure 1 ; Figure 3 This is a schematic diagram of the water-cutting arc section, O-shaped chamber, and auxiliary chamber of a well pit water-cutting retaining wall structure proposed in this invention. Figure 4 This is a three-dimensional structural diagram of a well pit water interception and retaining wall structure proposed in this invention. Figure 2 ; Figure 5 This is a top view of a well pit water interception and retaining wall structure proposed in this invention. Figure 2 ; Figure 6This is a schematic diagram of the water-cutting semi-circular part, the outwardly expanding arc part, and the g-shaped chamber of a well pit water-cutting retaining wall structure proposed in this invention. Figure 7 This is a three-dimensional structural diagram of a well pit water interception and retaining wall structure proposed in this invention. Figure 3 ; Figure 8 This is a top view of a well pit water interception and retaining wall structure proposed in this invention. Figure 3 ; Figure 9 This is a schematic diagram of the water-cutting semi-circular section, the straight section, and the teardrop-shaped cavity of a well pit water-cutting retaining wall structure proposed in this invention; Figure 10 This is a three-dimensional structural diagram of a well pit water interception and retaining wall structure proposed in this invention. Figure 4 ; Figure 11 This is a top view of a well pit water interception and retaining wall structure proposed in this invention. Figure 4 ; Figure 12 This is a schematic diagram of the straight plate-shaped chamber of a well pit water interception and retaining wall structure proposed in this invention; Figure 13 This is a three-dimensional structural diagram of a well pit water interception and retaining wall structure proposed in this invention. Figure 5 ; Figure 14 This is a top view of a well pit water interception and retaining wall structure proposed in this invention. Figure 5 ; Figure 15 This is a schematic diagram of the straight plate and U-shaped chamber of a well pit water interception and retaining wall structure proposed in this invention.

[0024] In the diagram: 1. Rectangular interlocking area; 10. Sheet pile; 100. Interlocking joint; 101. Base plate; 102. Side panel; 1021. Inner wall arc surface one; 103. Frame panel one; 1031. Inner wall curved surface two; 104. Frame plate two; 105. Inner fold plate one; 105a. Inner fold plate arc surface one; 106. Inner fold plate two; 106a. Inner fold plate arc surface two; 107a. Straight plate one; 107b. Straight plate two; 11a. Water-cutting circular arc section; 11b. Water-cutting semi-circular section one; 11c. Water-cutting semi-circular section two; 12a. O-shaped chamber; 12b. G-shaped chamber; 12c. Teardrop-shaped chamber; 12d. Figure-9 shaped chamber; 12e. U-shaped chamber; 13. Secondary chamber; 14a. Outwardly expanding arc section; 14b. Straight line section; 2. Buffer components; 3. Redundancy area. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] The following is in conjunction with the appendix Figure 1 - Appendix Figure 15 The technical solutions provided in the various embodiments of the present invention will be described in detail.

[0027] Reference Figure 2 This embodiment relates to a retaining wall structure for well pit water interception, aiming to solve the problem of water seepage into the well pit caused by gaps in the interlocking joints of steel sheet piles in the prior art. It also avoids relying on a single component for sealing reliability, simplifies the construction process, and reduces the difficulty of processing the interlocking joints. The structure includes multiple interlocking steel sheet piles 10. Each steel sheet pile 10 includes a base plate 101 and side plates 102 connected to both ends of the base plate 101. Interlocking fasteners 100 are provided on the side plates 102. Further, the interlocking fasteners 100 include a first frame plate 103 and a second frame plate 104 continuously formed with the side plates 102, as well as a filling interlocking connection assembly. In practical applications, the filling interlocking connection assembly refers to the structural component continuously formed with the second frame plate 104, used to fill the space and form a cavity during the interlocking process. It can be implemented using plates of various geometric shapes, such as straight plates, curved plates, or bent plates. Its main purpose is to create multiple independent cavities within the rectangular interlocking area 1 to block the water flow path.

[0028] Specifically, after the interlocking buckles 100 between adjacent sheet piles 10 interlock, a rectangular interlocking area 1 is formed between the two adjacent sheet piles 10 through the frame plate 103, the frame plate 104, and the filling interlocking connection assembly, and at least two chambers are formed in the rectangular interlocking area 1. Thus, the multi-chamber design in the rectangular interlocking area 1 provides multiple water flow blocking paths through physical separation. Even if there is micro-seepage in a single chamber, other chambers can still effectively intercept water flow, thereby avoiding the risk of seal failure. At the same time, since the interlocking buckles 100 and the side plate 102 are continuously formed, no secondary processing is required, reducing manufacturing difficulty. Furthermore, this structure eliminates the need for additional sealing strips (in the prior art, the main function of sealing strips is to fill the gap between two sheet piles) and protective baffles, simplifying the splicing process. As one implementation method, the formation of the rectangular interlocking area 1 relies on the rigid frame effect of the frame plate 103 and the frame plate 104, which evenly distributes the interlocking pressure, reducing the generation of local gaps. Therefore, this structural design replaces the existing technology's reliance on sealing strips with an integrated interlocking design, effectively improving water interception reliability and optimizing construction efficiency.

[0029] In order to further optimize the interlocking tightness of the sheet pile 10, the included angle between the side plate 102 and the bottom plate 101 is any angle greater than 90° and less than 180° (obtuse angle structure). The purpose is to make the sheet pile 10 more uniformly distributed when subjected to soil pressure and water pressure, and to avoid bending deformation at the connection between the bottom plate 101 and the side plate 102 due to stress concentration at the acute angle, thereby maintaining the structural rigidity during the interlocking process. The included angle between the first frame plate 103 and the side plate 102 is greater than 90° and less than 180° (obtuse angle structure). The first frame plate 103 is set parallel to the bottom plate 101, and the first frame plate 103 is located on the side of the side plate 102 away from the bottom plate 101. The second frame plate 104 is perpendicular to the first frame plate 103 and is located on the opposite side of the side plate 102. The purpose is to maintain the shape integrity of the rectangular interlocking area 1 after the two steel sheet piles 10 are spliced, and to avoid the rectangular interlocking area 1 from being twisted and deformed to produce gaps.

[0030] As a preferred embodiment, refer to Figure 1 , Figure 2 , Figure 3 The filling interlocking connection assembly includes a water-cutting arc portion 11a integrally formed with the second frame plate 104. An inner wall arc surface 1021 is provided between the side plate 102 and the first frame plate 103. The outer wall of the water-cutting arc portion 11a is in close contact with the inner wall of the inner wall arc surface 1021, and the outer walls of the two water-cutting arc portions 11a located in the rectangular interlocking area 1 are in contact with each other. The chamber includes an O-shaped chamber 12a and a secondary chamber 13 formed in the rectangular interlocking area 1 through the water-cutting arc portion 11a. A redundant area 3 is left between one end of the water-cutting arc portion 11a and the second frame plate 104. The two water-cutting arc portions 11a in the rectangular interlocking area 1 are staggered and interlocked. The water-cutting arc portion 11a refers to an arc-shaped sealing structure integrally formed with the frame plate 104. It can be achieved by directly stamping or cold bending metal sheets. Its purpose is to form a continuous sealing interface through the tight contact of the arc surfaces, avoiding reliance on external sealing strips. When two sheet piles 10 are spliced, the water-cutting arc portion 11a is in close contact with the inner wall of the inner arc surface 1021, which can eliminate the hidden dangers of traditional right-angle gaps. The tight contact of the outer walls of the two water-cutting arc portions 11a can effectively improve the firmness of the connection between adjacent sheet piles 10. The O-shaped chamber 12a and the secondary chamber 13 formed can effectively extend the seepage path and disperse water pressure. Compared with the chamberless design in the prior art, the chamber design can disperse water pressure and prevent continuous water seepage. When the water pressure in the chamber is high, the water in the chamber can also overflow to reduce the seepage water pressure. The design of the redundant area 3 between one end of the water-cutting arc section 11a and the frame plate 104 is to provide elastic space for displacement during the interlocking process of the sheet pile 10, to adapt to uneven settlement of the stratum or construction errors, and to prevent deformation caused by rigid contact. The staggered interlocking is to make the connection between the two sheet piles 10 more stable; it can be understood as the interlocking method in which the two water-cutting arcs 11a in the rectangular interlocking area 1 are offset and interlocked in space, the purpose of which is to transform the straight gap into a tortuous path and increase the seepage resistance.

[0031] It is necessary to understand that Figure 3 The two horizontal and vertical dashed lines in the middle indicate the misalignment of the two water-cutting arc parts 11a in the rectangular interlocking area 1.

[0032] As a preferred embodiment, refer to Figure 4 , Figure 5 , Figure 6 The filling interlocking connection component includes a water-cutting semi-arc portion 11b integrally formed with the frame plate 104. It can be implemented by using arc plates with different radii of curvature. The purpose is to form a continuous contact interface with adjacent components through the arc surface to eliminate linear gaps. An inner wall arc surface 1021 is provided between the side plate 102 and the frame plate 103. The inner wall arc surface 1021 refers to the arc-shaped inner surface between the side plate 102 and the frame plate 103. It can be implemented by using a smooth transition arc surface or an arc surface with micro-texture. The purpose is to provide a matching contact surface with the outer wall of the water-cutting semi-arc portion 11b. The outer wall of the water-cutting semi-arc portion 11b is in close contact with the inner wall of the inner wall arc surface 1021. An outwardly expanding arc portion 14a is integrally formed on the water-cutting semi-arc portion 11b. The radius of the outwardly expanding arc portion 14a is larger than the radius of the water-cutting semi-arc portion 11b. The outwardly expanding arc portion 14a refers to the arc-shaped extension portion with a larger radius integrally formed on the water-cutting semi-arc portion 11b. It can be achieved by adopting an arc structure with a gradually changing radius or a segmented arc structure. The purpose is to make the outwardly expanding arc portions 14a squeeze each other during splicing, forming a pre-pressure to improve the sealing between the two outwardly expanding arc portions 14a, so that the two outwardly expanding arc portions 14a in the rectangular interlocking area 1 are close to each other. The chamber includes a g-shaped chamber 12b formed in the rectangular interlocking area 1 by the water-cutting semi-arc part 11b, the outwardly expanding arc part 14a, and the frame plate 104. Its asymmetrical curved surface layout can guide a small amount of seepage water to flow along the g-shaped path and disperse the water pressure. At the same time, the chamber space can accommodate a small amount of seepage water to play a buffering role. A redundant area 3 is left between one end of the outwardly expanding arc portion 14a and the frame plate 104, which is used to reserve space for elastic deformation displacement in case of uneven settlement or stress fluctuation. Among them, the two water-cutting semi-circular parts 11b in the rectangular interlocking area 1 are staggered and interlocked, making the connection of the steel sheet piles 10 more stable and forming an effective sealed water-cutting retaining wall. The above solution further improves the sealing between the two sheet piles 10, preventing water from seeping into the well pit along the gaps. It should be understood that, since the two outwardly expanding arc portions 14a are close to each other in the rectangular interlocking area 1, chamfers are respectively opened on the outwardly expanding arc portions 14a at both ends of the sheet pile 10 to facilitate the initial insertion of one sheet pile 10 into the other sheet pile 10. It is necessary to understand that Figure 6 The two horizontal and vertical dashed lines in the middle indicate the misalignment of the two water-cutting semi-circular parts 11b in the rectangular interlocking area 1.

[0033] As a preferred embodiment, refer to Figure 7 , Figure 8 , Figure 9 The filling interlocking connection component includes a water-cutting semi-arc part 11c integrally formed with the frame plate 104. The water-cutting semi-arc part 11c refers to an arc-shaped water-cutting structure integrally formed with the frame plate 104. It can be made of metal sheet with a semi-circular or elliptical cross section by cold bending forming process. Its purpose is to provide a sealing interface that matches the inner wall arc surface 1021 and eliminate straight water seepage path. An inner wall arc surface 1021 is provided between the side plate 102 and the frame plate 103. It can be made of a curved surface structure with a circular arc transition or a parabolic transition. Its purpose is to form a tight fit with the outer wall of the water-cutting semi-arc part 11c and avoid gaps caused by abrupt angle changes. The outer wall of the water-cutting semi-arc part 11c is in close contact with the inner wall of the inner wall arc surface 1021. A straight section 14b is integrally formed on the water-cutting semi-circular section 11c. The straight section 14b refers to the straight extension integrally formed on the water-cutting semi-circular section 11c. Its purpose is to increase the interlocking interface, extend the seepage path, and be perpendicular to the line connecting the centers of the water-cutting semi-circular section 11c to evenly distribute the interlocking force, thereby improving the interlocking force of the rectangular interlocking area 1 and improving the sealing between adjacent sheet piles 10. When one sheet pile 10 is subjected to force and displaces towards the other sheet pile 10, the outer surfaces of the two straight sections 14b fit more tightly, and the contact area gradually increases, which can further improve the seepage prevention when the sheet pile 10 is subjected to force. The chamber includes a teardrop-shaped chamber 12c formed within the rectangular interlocking area 1 by the water-cutting semi-circular portion 11c, the straight portion 14b, and the frame plate 104. The teardrop-shaped chamber 12c refers to a closed space with a teardrop shape formed by the water-cutting semi-circular portion 11c, the straight portion 14b, and the frame plate 104. It can be realized by using a teardrop profile with a single curvature or a composite curvature. Its purpose is to increase the contact area, extend the seepage path, and increase the flow resistance while improving the connection strength of the sheet pile 10. A redundant area 3 is left between one end of the straight section 14b and the frame plate 104. This area can be achieved by using a fixed-size gap. The purpose of this is to accommodate construction errors and ground displacement, and to provide flexible adjustment space. Among them, the two water-cutting semi-circular parts 11c in the rectangular interlocking area 1 are misaligned and interlocked. Misaligned interlocking refers to the interlocking method in which the two water-cutting semi-circular parts 11c in the rectangular interlocking area 1 are not completely symmetrical in position when splicing. Its purpose is to make the sealing line asymmetrically distributed, increase the tortuousness of the seepage path, and improve the firmness of the two steel sheet piles 10 after they interlock with each other. It is necessary to understand that Figure 9 The two horizontal and vertical dashed lines in the middle indicate the misalignment of the two water-cutting semi-circular parts 11c in the rectangular interlocking area 1. Therefore, in this scheme, the initial gap is eliminated by matching the curved surfaces of the water-cutting semi-circular part 11c and the inner wall arc surface 1021, preventing water from seeping in along the straight interface. At the same time, the perpendicular setting of the straight part 14b and the center line of the water-cutting semi-circular part 11c ensures that the interlocking force is evenly distributed, preventing local stress concentration. The geometry of the teardrop-shaped chamber 12c extends the potential seepage path, forcing the water flow to change direction multiple times. The redundant area 3 provides elastic adjustment space to adapt to external deformation. The misaligned interlocking makes the sealing line asymmetrically distributed, fundamentally blocking the straight seepage channel. In addition, it avoids dependence on external seals, simplifies the construction process, improves the reliability of water interception, and enhances the structure's adaptability to construction errors and ground displacement.

[0034] As a preferred embodiment, refer to Figure 10 , Figure 11 , Figure 12 The filling interlocking connection component includes an inner folded plate 105 integrally formed with the frame plate 2 104. The inner folded plate 105 refers to a bent structure component continuously formed with the frame plate 2 104. It can be achieved by hot rolling integral forming or cold bending process. The purpose is to eliminate the connection interface and avoid potential leakage points caused by welding or assembly. An inner wall arc surface 1021 is provided between the side plate 102 and the frame plate 103. The inner wall arc surface 1021 can be understood as the arc-shaped inner surface of the transition area between the side plate 102 and the frame plate 103. Specifically, it can be formed by die stamping or CNC bending. Its purpose is to provide a continuous and uniform pressure distribution interface. An inner folded plate arc surface 105a is formed between the frame plate 2 104 and the inner folded plate 105. Specifically, the inner folded plate arc surface 105a refers to the arc-shaped transition surface between the frame plate 2 104 and the inner folded plate 105. It can be designed as a circular arc or an elliptical arc with different radii of curvature. The purpose is to form a tight and sealed fit with the inner wall arc surface 1021. The outer wall of the inner folded plate arc surface 105a is in close contact with the inner wall of the inner wall arc surface 1021. During the process of driving the sheet pile 10 into the soil, a continuous and uniform pressure distribution interface is formed, so that the geometric characteristics of the arc surface automatically maintain close contact under the action of ground movement or water pressure. An inner folding plate 106 is integrally formed on the inner folding plate 105, and a straight plate 107a is integrally formed on the inner folding plate 106. The straight plate 107a can be understood as a flat plate structure perpendicular to the line connecting the centers of the two inner folding plate arc surfaces 105a within the rectangular interlocking area 1. The purpose is to form a watertight barrier by the outer walls of the two straight plates 107a being in contact, thereby improving the water-proof performance. The connection between the straight plate 107a and the centers of the two inner folding plate arc surfaces 105a within the rectangular interlocking area 1 is perpendicular, and the outer walls of the two straight plates 107a are in close contact. The chamber includes a figure-9 shaped chamber 12d formed in the rectangular interlocking area 1 by the second frame plate 104, the first inner fold plate 105, the second inner fold plate 106, and the first straight plate 107a. The combination forms a tortuous internal path, which effectively extends the potential seepage channel and increases the resistance to water flow. A redundant area 3 is left between one end of the straight plate 107a and the frame plate 104, providing a flexible space. Among them, the two inner folded plates 106 and straight plates 107a in the rectangular interlocking area 1 are staggered and interlocked to disperse the interlocking force, avoid the concentration of gaps, and inhibit the water flow along the seepage path of the straight gaps, thereby forming a complete self-sealing system. It is necessary to understand that Figure 12 The two cross-shaped dashed lines indicate the location of the center of the inner folded plate arc surface 105a, and the intersecting vertical dashed lines indicate the vertical connection between the straight plate 107a and the centers of the two inner folded plate arc surfaces 105a within the rectangular interlocking area 1.

[0035] As a preferred embodiment, refer to Figure 13 , Figure 14 , Figure 15 The filling interlocking connection component includes an inner folded plate 105 integrally formed with the frame plate 2 104. The inner folded plate 105 refers to a bent structure continuously formed with the frame plate 2 104. It can be manufactured directly with the frame plate 2 104 using a hot rolling forming process, avoiding the welding process. The purpose is to improve the overall structure and reduce secondary processing costs. An inner fold plate arc surface 105a is formed between the frame plate 2 104 and the inner fold plate 105. Specifically, the inner fold plate arc surface 105a refers to the arc-shaped transition surface between the frame plate 2 104 and the inner fold plate 105. It can be designed as a circular arc or an elliptical arc with different radii of curvature, with the purpose of forming a tight and sealed fit with the inner wall arc surface 1021. An inner fold plate 106 is integrally formed on the inner fold plate 105. Specifically, the inner fold plate 106 refers to the secondary bending component formed by the extension of the inner fold plate 105. It can be achieved by a process of bending simultaneously with the inner fold plate 105, with the purpose of dispersing earth pressure and water pressure. An inner fold plate arc surface 106a is provided between inner fold plate 105 and inner fold plate 2 106, and an inner wall arc surface 1031 is provided between frame plate 103 and frame plate 2 104. The outer wall of inner fold plate arc surface 106a is in close contact with the inner wall of inner wall arc surface 1031. The purpose is to form a tight and sealed fit between inner fold plate arc surface 106a and inner wall arc surface 1031. A straight plate 107b is integrally formed on the inner folding plate 106. The straight plate 107b is parallel to the bottom plate 101. The outer walls of the two straight plates 107b in the rectangular interlocking area 1 are closely attached to each other. The purpose is to provide a large area of ​​planar contact to block the water flow path. The chamber includes a U-shaped chamber 12e formed in the rectangular interlocking area 1 by the second side plate 104, the first inner fold plate 105, the second inner fold plate 106, and the second straight plate 107b. Its shape optimizes the water flow blocking ability, effectively collects and retains seepage water, and buffers the seepage water pressure. A redundant area 3 is left between one end of the straight plate 2107b and the frame plate 2104 to reserve flexible space; Among them, the two straight plates 107b in the rectangular interlocking area 1 are horizontally interlocked. The horizontal interlocking design is designed to ensure complete horizontal fit in the direction of the pit sidewall and prevent gaps caused by angular deviation.

[0036] As a preferred embodiment, refer to Figure 3 , Figure 6 , Figure 9 , Figure 13 , Figure 15 To prevent the chamber from undergoing rigid deformation or structural damage under external soil or water pressure, which could lead to widening gaps in the interlocking area, reduced water interception reliability, and the lack of stress buffering mechanisms under long-term dynamic loads, thus exacerbating the risk of leakage, a buffer component 2 is installed in the chamber. Buffer component 2 is an elastic component that can absorb and disperse external dynamic stress. It can be made of rubber, spring structure, or foam filling material. Its purpose is to effectively alleviate the concentrated stress generated by soil compression or water flow impact through elastic deformation, avoid plastic deformation or micro-cracks on the chamber wall, and thus maintain the structural integrity of the interlocking area.

[0037] Specifically, the O-shaped chamber 12a, g-shaped chamber 12b, teardrop-shaped chamber 12c, 9-shaped chamber 12d, and U-shaped chamber 12e are equipped with buffer components 2. When external soil pressure or water pressure is applied to the sheet pile 10, the buffer component 2 undergoes elastic compression to absorb and disperse dynamic stress, preventing stress concentration from causing damage to the chamber wall. At the same time, the buffer component 2 dynamically compensates for the instantaneous changes in the geometry of the chamber under pressure, maintaining a tight fit between adjacent sheet piles 10 within the rectangular interlocking area 1, thereby ensuring that the interlocking area maintains its sealing performance under long-term dynamic loads and avoiding the problem of gap expansion caused by chamber deformation.

[0038] Among them, the buffer element 2 in the O-shaped chamber 12a, g-shaped chamber 12b, teardrop-shaped chamber 12c, and figure-9-shaped chamber 12d mainly fills the large-area chambers, so some chambers are reserved for buffering water, and the chambers will not be completely filled due to the configuration of the buffer element 2. When the buffer element 2 is configured in the U-shaped chamber 12e, the buffer element 2 needs to be designed separately. A buffer cavity needs to be set on the buffer element 2 and connected to the U-shaped chamber 12e. When water seeps in, the water can enter the buffer cavity located in the buffer element 2.

[0039] Since the buffer component 2 is configured in the O-shaped chamber 12a, the g-shaped chamber 12b, the teardrop-shaped chamber 12c, the figure-9-shaped chamber 12d, and the U-shaped chamber 12e, the buffer component 2 will not rub during splicing, thus avoiding large-area wear of the buffer component 2.

[0040] Therefore, the buffer 2 effectively prevents the rigid deformation of the chamber under external loads, ensures the stability of the interlocking gap, significantly improves the water interception reliability of the well pit water interception retaining wall structure in complex geological environments, and reduces the risk of leakage.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A well pit water interception and retaining wall structure, comprising multiple interlocking steel sheet piles (10), wherein each steel sheet pile (10) includes a base plate (101) and side plates (102) respectively connected to both ends of the base plate (101), and the side plates (102) are provided with interlocking buckles (100), characterized in that, The interlocking buckle (100) includes a first frame plate (103) and a second frame plate (104) continuously formed with the side plate (102), as well as a filling interlocking connection assembly; After the interlocking buckles (100) between adjacent sheet piles (10) interlock with each other, a rectangular interlocking area (1) is formed between the two adjacent sheet piles (10) by means of a first frame plate (103), a second frame plate (104), and a filling interlocking connection assembly, and at least two chambers are formed in the rectangular interlocking area (1).

2. The well pit water interception and retaining wall structure according to claim 1, characterized in that, The angle between the side plate (102) and the bottom plate (101) is greater than 90°, the angle between the first frame plate (103) and the side plate (102) is greater than 90°, and the first frame plate (103) is located on the side of the side plate (102) away from the bottom plate (101). The second frame plate (104) is perpendicular to the first frame plate (103) and is located on the opposite side of the side plate (102).

3. The well pit water interception and retaining wall structure according to claim 2, characterized in that, The filling occlusal connection assembly includes a water-cutting arc portion (11a) integrally formed with the second frame plate (104). An inner wall arc surface (1021) is provided between the side plate (102) and the first frame plate (103). The outer wall of the water-cutting arc portion (11a) is in close contact with the inner wall of the inner wall arc surface (1021), and the outer walls of the two water-cutting arc portions (11a) located in the rectangular occlusal area (1) are in contact with each other. The chamber includes an O-shaped chamber (12a) and a secondary chamber (13) formed in the rectangular occlusal area (1) through the water-cutting arc portion (11a). A redundant area (3) is left between one end of the water-cutting arc portion (11a) and the second frame plate (104). Among them, the two water-cutting arc portions (11a) in the rectangular biting area (1) are misaligned and biting.

4. The well pit water interception and retaining wall structure according to claim 2, characterized in that, The filling interlocking connection assembly includes a water-cutting semi-arc part one (11b) integrally formed with the frame plate two (104), and an inner wall arc surface one (1021) is provided between the side plate (102) and the frame plate one (103). The outer wall of the water-cutting semi-arc part one (11b) is in close contact with the inner wall of the inner wall arc surface one (1021). An outwardly expanding arc portion (14a) is integrally formed on the water-cutting semi-arc portion one (11b). The radius of the outwardly expanding arc portion (14a) is larger than the radius of the water-cutting semi-arc portion one (11b), so that the two outwardly expanding arc portions (14a) in the rectangular biting area (1) are close to each other. The chamber includes a g-shaped chamber (12b) formed in the rectangular biting area (1) by the water-cutting semi-arc portion one (11b), the outwardly expanding arc portion (14a), and the frame plate two (104). A redundant area (3) is left between one end of the outer arc portion (14a) and the second frame plate (104); Among them, the two water-cutting semi-arc portions (11b) in the rectangular biting area (1) are misaligned and biting.

5. The well pit water interception and retaining wall structure according to claim 2, characterized in that, The filling interlocking connection assembly includes a water-cutting semi-arc part two (11c) integrally formed with the second frame plate (104), and an inner wall arc surface one (1021) is provided between the side plate (102) and the first frame plate (103). The outer wall of the water-cutting semi-arc part two (11c) is in close contact with the inner wall of the inner wall arc surface one (1021). A straight section (14b) is integrally formed on the water-cutting semi-arc section two (11c), and the straight section (14b) is perpendicular to the line connecting the centers of the two water-cutting semi-arc sections two (11c) in the rectangular interlocking area (1). The chamber includes a teardrop-shaped chamber (12c) formed within the rectangular interlocking area (1) by the water-cutting semi-circular portion two (11c), the straight portion (14b), and the frame plate two (104). A redundant area (3) is left between one end of the straight section (14b) and the second frame plate (104); Among them, the two water-cutting semi-arc portions (11c) in the rectangular biting area (1) are misaligned and biting.

6. The well pit water interception and retaining wall structure according to claim 2, characterized in that, The filling interlocking connection assembly includes an inner folded plate (105) integrally formed with the second frame plate (104), an inner wall arc surface (1021) is provided between the side plate (102) and the first frame plate (103), an inner folded plate arc surface (105a) is formed between the second frame plate (104) and the first inner folded plate (105), and the outer wall of the inner folded plate arc surface (105a) is in close contact with the inner wall of the inner wall arc surface (1021); An inner folding plate two (106) is integrally formed on the inner folding plate one (105), and a straight plate one (107a) is integrally formed on the inner folding plate two (106). The connection between the straight plate one (107a) and the center of the two inner folding plate arc surfaces one (105a) in the rectangular interlocking area (1) is perpendicular, and the outer walls of the two straight plates one (107a) are in close contact. The chamber includes a figure-9 shaped chamber (12d) formed in the rectangular occlusal area (1) by the second side plate (104), the first inner fold plate (105), the second inner fold plate (106), and the first straight plate (107a); A redundant area (3) is left between one end of the straight plate (107a) and the second frame plate (104); Among them, the two inner folded plates (106) and straight plates (107a) in the rectangular biting area (1) are misaligned and biting.

7. The well pit water interception and retaining wall structure according to claim 2, characterized in that, The filling interlocking connection assembly includes an inner folded plate (105) integrally formed with the second frame plate (104), an inner folded plate arc surface (105a) is formed between the second frame plate (104) and the inner folded plate (105), an inner folded plate (106) is integrally formed on the inner folded plate (105), and an inner folded plate arc surface (106a) is provided between the inner folded plate (105) and the inner folded plate (106). An inner wall arc surface one (1021) is provided between the side plate (102) and the first frame plate (103), and an inner wall arc surface two (1031) is provided between the first frame plate (103) and the second frame plate (104). The outer wall of the inner folded plate arc surface one (105a) is in close contact with the inner wall of the inner wall arc surface one (1021), and the outer wall of the inner folded plate arc surface two (106a) is in close contact with the inner wall of the inner wall arc surface two (1031). A straight plate (107b) is integrally formed on the inner folding plate (106). The straight plate (107b) is parallel to the bottom plate (101), and the outer walls of the two straight plates (107b) in the rectangular interlocking area (1) are in close contact. The chamber includes a U-shaped chamber (12e) formed in the rectangular occlusal area (1) by the second side plate (104), the first inner fold plate (105), the second inner fold plate (106), and the second straight plate (107b). A redundant area (3) is left between one end of the straight plate 2 (107b) and the frame plate 2 (104); Among them, the two straight plates (107b) in the rectangular biting area (1) are horizontally biting.

8. A well pit water interception and retaining wall structure according to any one of claims 3, 4, 5, 6, and 7, characterized in that, The chamber is equipped with a buffer (2).

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