Concrete arc-shaped sheet pile and production mold thereof

Abstract

The utility model discloses a concrete arc-shaped sheet pile and a production die thereof, which belong to the field of constructional engineering and comprise an arc-shaped pile body, and a thickening area is arranged in an arc-shaped inner groove at one end of the arc-shaped pile body. The thickening area is arranged in the end inner groove area where the stress of the arc-shaped pile body is most concentrated, so that the volume and the thickness of concrete in the area are increased, the bearing capacity is improved, impact stress concentration during vibration pile sinking or hammering is effectively resisted, the strength of the pile head is improved, the pile head is prevented from being crushed or cracked, and the pile sinking integrity is guaranteed. The two sides of the arc-shaped pile bodies extend outwards to form flange plates, the flange plates are distributed on the two sides of the arc-shaped pile bodies, a platform is provided for lap joint of the adjacent arc-shaped pile bodies, and the arc-shaped pile bodies are sequentially connected to form a continuous wall structure.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering, specifically a concrete arc-shaped sheet pile and its production mold. Background Technology

[0002] In water conservancy bank protection projects, municipal drainage ditch projects, and foundation pit support projects, protective sheet piles are widely used for retaining soil, cutting off water, and stabilizing excavated slopes. Traditional sheet piles mostly adopt a straight design, but their bending stiffness is limited, and they are prone to bending deformation when subjected to large earth pressure or water pressure. To improve structural strength, curved pile designs have gradually been applied. By converting external loads into axial pressure through the curvature structure, the bending performance is significantly enhanced, making them particularly suitable for deep foundation pits or high water pressure conditions.

[0003] Currently, sheet pile construction mainly relies on vibration or hammering methods, requiring materials with good impact resistance and ductility. Therefore, steel has become the mainstream choice for curved sheet piles: it has high toughness, the pile body is easy to sink into the soil, and it can withstand high-frequency impacts during construction. For example, patent CN212772302U discloses a steel-plastic retaining sheet pile, including a pipe body, a first curved plate connected to one side of the pipe body, and a second curved plate connected to the other side of the pipe body. The curved plate disperses the force, making the overall stress distribution of the retaining sheet pile uniform.

[0004] However, steel is prone to electrochemical corrosion in damp soil or water environments, leading to a significant risk of rust during long-term service. Even with anti-corrosion coatings, durability issues remain in permanent or semi-permanent projects (such as embankment protection and municipal drainage systems), resulting in high maintenance costs and safety hazards.

[0005] If concrete sheet piles are used, the impact area of ​​the pile head is small when using vibration or hammering methods. In particular, the curved cross-section further compresses the contact surface, and stress concentration leads to local crushing or cracking, which seriously affects the pile driving efficiency and structural integrity. Utility Model Content

[0006] The purpose of this utility model is to provide a concrete arc-shaped sheet pile and its production mold to solve the problems mentioned in the prior art.

[0007] A concrete curved sheet pile is provided, comprising:

[0008] The arc-shaped pile body has a thickened area in the arc-shaped inner groove at one end.

[0009] Furthermore, the two sides of the arc-shaped pile body extend outward to form flange plates.

[0010] Flange plates are distributed on both sides of the arc-shaped pile body, providing a platform for the overlapping of adjacent arc-shaped pile bodies, so that the arc-shaped pile bodies can be connected in sequence to form a continuous wall structure.

[0011] Furthermore, the bearing surfaces of the two flange plates respectively form a male tenon and a female tenon.

[0012] The mortise and tenon joint allows for stable connection between adjacent curved piles, providing resistance to lateral displacement and pull-out. This structure enhances the continuity and stability of the entire pile wall structure, effectively preventing gaps or misalignment between piles and walls, and strengthening water and soil retention.

[0013] Furthermore, the end of the flange plate away from the thickened area is recessed inward to form a beveled pile tip.

[0014] The beveled design of the pile tip enables the pile bottom to cut through the soil in a wedge shape, reducing pile driving resistance, improving sinking efficiency, and preventing the concrete pile bottom from being crushed or cracked. In addition, during the pile driving process, the beveled pile tip generates lateral squeezing force at the contact surface with the soil, which allows the driven pile to fit more tightly with the previous pile.

[0015] Furthermore, a beveled support is provided between the thickened area and the arc-shaped inner groove.

[0016] The slanted support serves as a structural transition, creating a smooth stress transmission path between the thickened area and the curved pile body. This reduces stress concentration at abrupt structural changes, prevents cracks caused by shear stress at the connection between the curved pile body and the thickened area, and improves impact resistance.

[0017] Furthermore, the slope of the inclined support foot forms an angle of α degrees with the extension direction of the arc-shaped inner groove, and the angle α is 25°-40°.

[0018] Controlling the angle range makes the stress distribution more reasonable. The slope can guide the impact force to spread to a larger area of ​​the pile body, effectively buffering stress under vibration or hammering conditions, preventing local shear failure, and making the structure have both strength and toughness. At the same time, it avoids material waste caused by excessive extension of the inclined side.

[0019] Furthermore, the ratio between the dimension of the thickened area in the length direction of the arc-shaped pile and the total length of the arc-shaped pile is 1-3:16.

[0020] By limiting the proportion of the thickened area in the curved pile body, the curved pile body is reinforced only in the critical stress areas, avoiding material waste, balancing structural strength and economy, and controlling the amount of concrete used while ensuring the pile's resistance to impact.

[0021] Furthermore, the ratio between the extended thickness of the thickened area and the cavity thickness of the arc-shaped inner groove is 3-7:10.

[0022] By setting a thickness ratio, the thickened area is ensured to have sufficient bearing capacity, while the pile size is not excessively increased. This optimizes the structural stress distribution, improves the compressive strength of the pile head, and avoids cracking or crushing due to insufficient thickness.

[0023] Another aspect of this utility model provides a production mold for producing the aforementioned concrete curved sheet piles, comprising:

[0024] The bottom mold has an inwardly recessed first cavity plate;

[0025] Two side molds, each hinged to one side of the bottom mold;

[0026] The cover mold has a second cavity plate that extends outward.

[0027] The three-sided mold configuration and the side mold hinge mechanism facilitate demolding and reuse. In particular, the hinged rotation structure of the side mold can flexibly form complex constrained cavities of the flange plate, while reducing the number of fasteners between molds and the number of fastener locking operations.

[0028] Furthermore, the outer arc surface of the bottom mold is provided with bottom mold longitudinal stiffeners and bottom mold transverse stiffeners, the side mold is hinged to the bottom mold transverse stiffeners, and the side mold is provided with vertical plates.

[0029] The longitudinal and transverse stiffening plates of the bottom formwork enhance its overall rigidity and bending resistance, preventing deformation during concrete pouring. The bottom formwork does not need to be a solid structure; the stiffening plates reduce its weight while maintaining strong stability. Furthermore, the transverse stiffening plates provide an installation platform for the bolted hinged shaft components of the side formwork. After the side formwork rotates, the vertical plates can engage with the bottom formwork to form a fully enclosed cavity structure.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] The thickened zone is set in the inner groove area where the stress is most concentrated in the arc-shaped pile body. This increases the volume and thickness of the concrete in this area, improves the bearing capacity, effectively resists the concentrated impact during vibration pile driving or hammering, improves the strength of the pile head, avoids the pile head being crushed or cracked, and ensures the integrity of the pile driving. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1A schematic diagram of the overall structure of a concrete curved sheet pile;

[0034] Figure 2 Elevation structural diagram of the assembled concrete curved sheet pile;

[0035] Figure 3 This is a cross-sectional structural diagram of a concrete curved sheet pile;

[0036] Figure 4 Exploded view of the production mold;

[0037] Figure 5 This is a schematic diagram of the overall structure after the production mold is assembled.

[0038] In the diagram: 1. Arc-shaped pile body; 11. Arc-shaped inner groove; 12. Thickened area; 13. Flange plate; 131. Tenon joint; 132. Tenon joint; 14. Pile tip bevel; 15. Beveled support; 2. Bottom mold; 21. First cavity plate; 22. Bottom mold longitudinal reinforcement plate; 23. Bottom mold transverse reinforcement plate; 3. Side mold; 31. Vertical plate; 4. Cover mold; 41. Second cavity plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0040] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0041] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0042] Please see Figures 1-3 As shown in the embodiment of this utility model, a concrete arc-shaped sheet pile includes an arc-shaped pile body 1, with a thickened area 12 provided in the arc-shaped inner groove 11 at one end of the arc-shaped pile body 1. The arc-shaped pile body 1 is a reinforced concrete component, and the concave arc surface of the arc-shaped pile body 1 is the arc-shaped inner groove 11. The end of the arc-shaped pile body 1 that bears the vibration pile driving or hammer pile driving process is the pile head, and the end of the arc-shaped pile body 1 that is driven into the soil layer is the pile tail. By providing a thickened area 12 at the pile head, the arc-shaped pile body 1 strengthens the impact resistance of the pile head during vibration pile driving or hammer pile driving, and avoids local damage and crushing of the pile head.

[0043] Both sides of the arc-shaped pile 1 extend outward to form flange plates 13. The flange plates 13 are located on both sides of the arc-shaped pile 1, forming a transverse overlapping platform between the arc-shaped piles 1. When multiple arc-shaped piles 1 are arranged sequentially, the flange plate 13 of each pile can be butt-joined or overlapped with the flange plate 13 of the adjacent pile. The flange plate 13 provides a stable connection surface, facilitating a smooth transition and force transmission. After the arc-shaped piles 1 are connected by overlapping flange plates 13, a seamless arc-shaped continuous sheet pile wall is formed, improving integrity and sealing, making it particularly suitable for water-retaining and soil-retaining applications.

[0044] Furthermore, the bearing surfaces of the two flange plates 13 respectively form a male tenon 131 and a female tenon 132. The male tenon 131 is a columnar structure protruding outward from the side wall of the flange plate 13, and the female tenon 132 is a groove structure recessed inward from the side wall of the flange plate 13. On the bearing surfaces where adjacent arc-shaped piles 1 meet, the male tenon 131 and the female tenon 132 fit together.

[0045] The tenon 131 and tenon 132 have a self-positioning function, enabling mechanical guidance and limiting of the arc-shaped pile 1 during installation. The tenon-groove structure provides a fixed mating relationship, avoiding manual alignment deviations and ensuring consistency between the wall axis and the lap joint position. The socket structure forms a nested sealing joint, increasing the fluid penetration path and improving sealing performance, making it particularly suitable for scenarios with high sealing requirements such as revetments, seepage barriers, and drainage ditches. The tenon-groove structure provides a shear bearing surface. When the arc-shaped pile 1 is subjected to soil pressure and water pressure, the tenon 131 and tenon 132 generate mutual shear resistance, enhancing local anti-tipping function and limiting the relative displacement of the pile.

[0046] Furthermore, the end of the flange plate 13 furthest from the thickened area 12 is recessed inward to form a pile tip bevel 14. The pile tip bevel 14 forms a wedge-shaped inclined surface structure, which has a soil-breaking and splitting effect at the bottom front end of the pile body during pile driving. It can guide the vertical impact force into a combined downward and lateral force, disperse the soil resistance, reduce the concentration of force, and protect the bottom edge of the curved pile body 1 concrete from being crushed or impact-stripped.

[0047] A beveled support 15 is provided between the thickened area 12 and the arc-shaped inner groove 11. The beveled support 15 is a concrete structure and is cast synchronously with the arc-shaped pile 1. The beveled support 15 is positioned between the thickened area 12 and the arc-shaped inner groove 11, serving as a geometric transition. Compared to right-angle or abrupt connection structures, the beveled support 15 creates a smooth and continuous connection interface between two areas with different stiffnesses. At the junction of the arc-shaped inner groove 11 and the thickened area 12, if there is an abrupt connection without a transition design, the thickened area 12 is prone to forming a local shear stress concentration point after being subjected to axial impact force or bending moment, which can induce concrete cracks. The beveled support 15, on the other hand, disperses the stress gradient and reduces local stress concentration.

[0048] Furthermore, the slope of the inclined foot 15 and the extension direction of the arc-shaped inner groove 11 form an angle of α degrees, with α being 25°-40°. When the stress in the thickened area 12 is transferred to the arc-shaped inner groove 11 through the inclined foot 15, a stress diffusion distribution area will be formed on the cross-section of the inclined foot 15. The purpose of selecting this angle range is to cover the stress diffusion area with the distribution area of ​​the inclined foot 15, avoiding stress defects caused by excessively steep or gentle slopes. Specifically, a slope with a reasonable angle can guide the force to a wider angular distribution when subjected to vibration, hammering, or bending moment loads, thereby expanding the concentrated force into a planar transmission and reducing single-point stress. If the slope angle is too small, the length of the inclined side will increase unnecessarily, resulting in material waste and increased mold complexity.

[0049] The ratio between the dimension L1 of the thickened area 12 along the length of the arc-shaped pile 1 and the total length L2 of the arc-shaped pile 1 is 1-3:16. That is, the thickness is reinforced only in a section of the arc-shaped pile 1, usually corresponding to the pile head or impact-prone parts, to achieve local structural reinforcement. If the thickened area is too long, it will not only lead to a large waste of materials, but also increase the self-weight, construction burden and mold complexity.

[0050] The ratio between the extended thickness H1 of the thickened zone 12 and the cavity thickness H2 of the arc-shaped inner groove 11 is 3-7:10. By thickening the pile body in a specific area, the pile head has a stronger local bearing capacity, effectively withstanding the impact force and axial pressure during pile driving. Increasing the thickness ratio helps guide the even distribution of stress, avoiding stress concentration in critical areas of the pile head, and reducing the risk of cracking or crushing due to insufficient local strength. In addition, since the thickened zone 12 is formed in the pile head area at a higher elevation, if the thickness of the thickened zone 12 is too large, it will cause the gravity of the arc-shaped pile body 1 to be eccentrically distributed, increasing the risk of tipping over, and avoids excessive thickening leading to a bulky structure and wasted materials.

[0051] Please see Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, another aspect of this utility model provides a production mold for producing the aforementioned arc-shaped pile 1, including a bottom mold 2, two side molds 3, and a cover mold 4. The bottom mold 2 has an inwardly recessed first cavity plate 21. The two side molds 3 are respectively hinged to both sides of the bottom mold 2. The cover mold 4 has an outwardly extending second cavity plate 41. When the mold is closed, the first cavity plate 21 and the second cavity plate 41 are arranged opposite to each other, and both sides are supported by the side molds 3 to form an arc-shaped cavity inside that conforms to the shape of the arc-shaped pile 1.

[0052] In one specific embodiment, the bottom mold 2, the two side molds 3 and the cover mold 4 constitute a complete cavity, which can simultaneously define the arc-shaped inner groove 11, the thickened area 12, the flange plate 13, the male tenon 131, the female tenon 132, the pile tip bevel 14 and the beveled support 15 of the arc-shaped pile body 1, which is suitable for forming irregular components with spatial geometric structures.

[0053] When the mold is closed, the side mold 3 and the cover mold 4 are fixed together by mold opening pins. The three molds form a closed cavity, which is shaped after concrete is poured. When demolding, the side mold 3 is opened by rotating through the hinge structure without interfering with the other parts, which helps to maintain the structural integrity. Specifically, one end of the side mold 3 is connected to the bottom mold 2 through a hinge shaft. During the demolding stage, the side mold 3 can rotate around the hinge point to achieve the opening action, so that the demolding operation no longer relies on a large amount of lateral pulling force or lifting equipment, while not affecting the surface integrity of the flange plate 13 of the component.

[0054] Furthermore, the outer arc surface of the bottom mold 2 is provided with longitudinal stiffening plates 22 and transverse stiffening plates 23. The side mold 3 is hinged to the transverse stiffening plates 23, and a vertical plate 31 is provided on the side mold 3. The longitudinal stiffening plates 22 and transverse stiffening plates 23 are distributed in a grid pattern or crosswise to form a rigid skeleton structure, which significantly improves the overall rigidity of the bottom mold 2. Instead of using a solid bottom mold 2, a stiffening plate structure is used, which saves materials and reduces its own weight, and facilitates hoisting, handling and construction layout. The transverse stiffening plates 23 are provided with bolt hinge holes to provide a stable platform for the rotating connection components of the side mold 3. When the side mold 3 is connected to the transverse stiffening plates 23 through hinges, the vertical plate 31 rotates and closes to the working position. The vertical plate 31 closes with the first cavity plate 21 and the second cavity plate 41 respectively to form a completely closed mold cavity.

[0055] In one specific embodiment, the two upright plates 31 are respectively provided with a male tenon mold and a female tenon mold for forming a male tenon 131 and a female tenon 132.

[0056] In one specific embodiment, the cavity between the cover mold 4 and the second cavity plate 41 is hollow, and the cover mold 4 is provided with a lifting lug on the side away from the second cavity plate 41 to facilitate the lifting and transportation of the cover mold 4.

[0057] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A type of concrete arc-shaped sheet pile, characterized in that, include: The arc-shaped pile body (1) has a thickened area (12) in the arc-shaped inner groove (11) at one end.

2. The concrete arc-shaped sheet pile according to claim 1, characterized in that, The two sides of the arc-shaped pile (1) extend outward to form flange plates (13).

3. A concrete arc-shaped sheet pile according to claim 2, characterized in that, The two flange plates (13) form a male tenon (131) and a female tenon (132) respectively on their bearing surfaces.

4. A concrete arc-shaped sheet pile according to claim 2, characterized in that, The flange plate (13) is recessed inward at the end away from the thickened area (12) to form a pile tip bevel (14).

5. A concrete arc-shaped sheet pile according to claim 1, characterized in that, A slanted support (15) is provided between the thickened area (12) and the arc-shaped inner groove (11).

6. A concrete arc-shaped sheet pile according to claim 5, characterized in that, The slope of the inclined support (15) forms an angle of α degrees with the extension direction of the arc-shaped inner groove (11), and the angle α is 25°-40°.

7. A concrete arc-shaped sheet pile according to claim 1, characterized in that, The ratio of the dimension of the thickened area (12) in the length direction of the arc-shaped pile (1) to the total length of the arc-shaped pile (1) is 1-3:

16.

8. A concrete arc-shaped sheet pile according to claim 1, characterized in that, The ratio between the extended thickness of the thickened area (12) and the cavity thickness of the arc-shaped inner groove (11) is 3-7:

10.

9. A production mold for producing concrete curved sheet piles as described in claim 2, characterized in that, include: The bottom mold (2) has an inwardly recessed first cavity plate (21). Two side molds (3) are respectively hinged to both sides of the bottom mold (2); The cover mold (4) has an outwardly extending second cavity plate (41).

10. A production mold according to claim 9, characterized in that, The outer arc surface of the bottom mold (2) is provided with bottom mold longitudinal stiffener plate (22) and bottom mold transverse stiffener plate (23). The side mold (3) is hinged to the bottom mold transverse stiffener plate (23). The side mold (3) is provided with a vertical plate (31).

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