Steel sheet pile connecting structure and ecological revetment

Abstract

The invention relates to the technical field of water conservancy projects, and discloses a steel sheet pile connecting structure and an ecological revetment. According to the steel sheet pile connecting structure, the thickening layer of the plain concrete cushion layer is arranged at the connecting position of the steel sheet pile and the bearing platform, and the exposed metal area formed in the welding process is completely wrapped inside, so that the exposed metal area formed due to high-temperature damage in the welding process is not directly exposed to seawater or a high-corrosion environment; corrosion media (water, chloride ions and oxygen) are prevented from being in contact with the metal surface, invasion of the corrosion media is avoided, and a corrosion starting point is eliminated. Meanwhile, according to the structural design, post-welding supplementary coating treatment is not needed, the construction cost is remarkably reduced, the construction period is remarkably shortened, the problem of secondary corrosion prevention failure caused by mismatching of adhesive force and durability in a traditional supplementary coating process is solved, and continuity and integrity of the corrosion prevention performance of the connecting part are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic engineering, in particular to a steel sheet pile connecting structure and an ecological revetment. BACKGROUND

[0002] High-pile pile-supported revetment is a typical structure widely used in coastal and river revetment engineering. It suspends the pile cap above the water level fluctuation area through pile foundation, which can effectively resist water erosion and wave impact, and can adapt to complex geological conditions. This structure has the advantages of short construction period, strong bearing capacity, high adaptability to terrain, etc., and is especially suitable for soft soil foundation or areas with significant water depth changes. The core feature is the synergistic effect of pile foundation and pile cap: pile foundation bears vertical load and provides horizontal resistance, while pile cap integrates the stress performance of pile foundation through rigid connection to achieve the stability of the overall structure.

[0003] Steel sheet piles, as the key supporting material for high-pile pile-supported revetment, are widely used in revetment engineering due to their high strength, lightweight, and good water sealing performance. It forms a continuous retaining wall by locking and engaging, which can effectively isolate the interaction between soil and water. In seawater or high-corrosion environment (such as salt spray environment), steel sheet piles are easily corroded due to long-term exposure to water level fluctuation area, resulting in degradation of structural performance. The existing technology generally applies a corrosion-resistant coating (such as epoxy resin, polyurethane, etc.) on the surface of the steel sheet pile to isolate the corrosive medium and prolong its service life.

[0004] In actual construction, the connection between steel sheet piles and pile caps needs to be achieved through welding to realize structural integration. However, the high temperature generated during welding will directly damage the chemical structure of the coating, resulting in the formation of bare metal surface in local areas, which becomes the starting point for corrosion. In addition, the temperature gradient in the welding heat-affected zone may also cause the coating to crack or peel off, further expanding the range of corrosion-free gaps. Post-welding recoating is required, but such recoating process not only increases construction cost and construction period, but also the adhesion and durability of the recoating layer are difficult to match the original coating. SUMMARY

[0005] Therefore, the present application provides a steel sheet pile connecting structure and an ecological revetment to solve the problem of reduced durability caused by corrosion-free gaps in existing steel sheet piles.

[0006] In a first aspect, the steel sheet pile connecting structure provided by the present application comprises a pile cap, a steel sheet pile, and a plain concrete cushion. The steel sheet pile is anchored and connected to the pile cap through a reinforcing member; the plain concrete cushion has a base layer and a thickened layer, which are stacked in the height direction, the base layer is uniformly laid on the bottom of the pile cap, and the thickened layer is laid on the bottom of the base layer. The thickened layer is configured to cover the connection part of the reinforcing member and the steel sheet pile.

[0007] Beneficial effects: The present application sets a thickened layer of concrete cushion at the connection part of steel sheet pile and pile cap, which completely wraps the exposed metal area formed during welding process, so that the exposed metal area caused by high temperature damage during welding process is not directly exposed to seawater or high corrosive environment, preventing the contact between corrosive medium and metal surface, avoiding the invasion of corrosive medium, and eliminating the corrosion starting point. At the same time, the structure design does not need post-welding coating treatment, which significantly reduces the construction cost and construction period, avoids the secondary corrosion failure problem caused by the mismatch of adhesion and durability in the traditional coating process, and ensures the continuity and integrity of the corrosion resistance of the connection part. In addition, since the connection part is tightly covered by the high-strength and corrosion-resistant concrete thickened layer, the overall stiffness and stability of the connection node can also be enhanced, and the concrete coating layer can uniformly transfer stress, reduce stress concentration, protect the reinforcement from external force impact or wear, and improve the service life and durability of the revetment pile structure in corrosive environment, prolonging the service period of the steel sheet pile connection structure.

[0008] In an alternative embodiment, the steel sheet pile connection structure further comprises a square pile installed at the bottom of the pile cap, and the square pile is arranged in space with the steel sheet pile.

[0009] Beneficial effects: As a vertical support member, the square pile can work cooperatively with the steel sheet pile by arranging the square pile in space with the steel sheet pile, so as to jointly bear the load from the upper pile cap and directly and efficiently transfer the vertical load to the deep foundation, significantly reducing the vertical pressure borne by the steel sheet pile. At the same time, the square pile itself has a certain stiffness, which can effectively constrain the deformation of the soil behind the steel sheet pile and form a complement with the steel sheet pile. Even in the case of large water and soil pressure, the composite system can provide more solid and reliable support, further ensuring the integrity and safety of the supporting structure.

[0010] In an alternative embodiment, a plurality of reinforcement members are provided, and the plurality of reinforcement members are arranged in space.

[0011] Beneficial effects: By providing a plurality of reinforcement members arranged in space, the relative displacement between the steel sheet pile and the pile cap is jointly constrained in the longitudinal and transverse directions, the stiffness of the node and the entire supporting structure is enhanced, which can more effectively resist the shear force and bending moment caused by soil pressure, water pressure and earthquake load, reduce the structural deformation, and improve the overall stability.

[0012] In an alternative embodiment, the thickened layer is located at the soil side of the steel sheet pile.

[0013] Beneficial effects: The thickened layer of the concrete cushion is arranged at the soil side of the steel sheet pile, which can directly cover the welding point and block the penetration path of soil corrosive medium to the exposed metal, eliminating the corrosion starting point.

[0014] In an alternative embodiment, the bearing platform is embedded with bearing platform reinforcement bars, which are anchored and connected with the reinforcement member through the connecting member.

[0015] Beneficial effects: the reinforcement member is anchored and connected with the reinforcement bar framework inside the bearing platform through the connecting member, and the steel sheet pile and the bearing platform are reliably connected in rigidity, the ability of the joint to resist bending moment and shear force is enhanced, and the load borne by the reinforcement member can be efficiently dispersed to the bearing platform, which is borne by the bearing platform reinforcement bars, effectively avoiding the damage of the bearing platform concrete caused by stress concentration, and ensuring the safety and durability of the bearing platform.

[0016] In an alternative embodiment, the steel sheet pile section is in the shape of a straight line, U or Z.

[0017] In an alternative embodiment, the steel sheet pile connection structure further comprises a corrosion-resistant coating applied to the outer wall of the steel sheet pile.

[0018] Beneficial effects: the corrosion-resistant coating on the outer wall of the steel sheet pile serves as a basic corrosion barrier, effectively preventing the direct contact of corrosive media such as seawater and salt mist with the outer wall of the steel sheet pile, reducing the corrosion risk of the steel sheet pile in the non-welded area. At the same time, the corrosion-resistant coating and the thickened layer of the plain concrete cushion layer work together to form a protection mode of overall corrosion protection of the outer wall and precise protection of the welding points, prolonging the service life of the steel sheet pile.

[0019] In a second aspect, the present application also provides an ecological revetment, comprising a revetment body and a steel sheet pile connection structure, the steel sheet pile connection structure being the steel sheet pile connection structure provided in the first aspect, and the steel sheet pile connection structure being installed on the water side of the revetment body.

[0020] Beneficial effects: because the ecological revetment comprises the steel sheet pile connection structure, it has the same effects as the steel sheet pile connection structure, which will not be described here.

[0021] In an alternative embodiment, the water side of the revetment body is provided with an aquatic plant platform for planting submerged or emergent plants.

[0022] In an alternative embodiment, the land side of the revetment body is provided with a terrestrial plant platform for planting grasses, shrubs and trees. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1A front view of the steel sheet pile connecting structure provided by the embodiment of the present application;

[0025] Figure 2 A front view of the steel sheet pile connecting structure provided by the embodiment of the present application;

[0026] Figure 3 A plan view of the reinforcing member and the steel sheet pile when connected in the steel sheet pile connecting structure provided by the embodiment of the present application;

[0027] Figure 4 A front view of the ecological revetment provided by the embodiment of the present application.

[0028] Explanation of reference numerals:

[0029] 11, pile cap; 111, pile cap steel bar; 12, steel sheet pile; 13, connecting member; 14, plain concrete cushion layer; 141, base layer; 142, thickened layer; 15, square pile; 16, reinforcing member; 17, warning pile;

[0030] 2, revetment body; 21, aquatic plant platform; 22, terrestrial plant platform;

[0031] 31, submerged or emergent plant; 32, grass and shrub; 33, tree;

[0032] 4, road;

[0033] 5, drainage ditch;

[0034] a, design water level; b, front mud surface line of pile cap; c, water side; d, soil side. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms “center”, “upper”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In the description of the present application, unless otherwise specified, the meaning of “several” and “multiple” is two or more.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The embodiments of the present application will be described below in conjunction with Figures 1 to 4 .

[0040] According to the embodiments of the present application, in one aspect, a steel sheet pile connection structure is provided, as shown in Figure 1 , comprising a bearing platform 11, a steel sheet pile 12 and a concrete cushion layer 14.

[0041] As shown in Figure 1 and Figure 2 , the steel sheet pile 12 is anchored and connected with the bearing platform 11 through a reinforcing member 16; the concrete cushion layer 14 has a base layer 141 and a thickened layer 142, the base layer 141 and the thickened layer 142 are stacked in the height direction, the base layer 141 is uniformly laid on the bottom of the bearing platform 11, and the thickened layer 142 is laid on the bottom of the base layer 141, and the thickened layer 142 is configured to cover the connecting part of the reinforcing member 16 and the steel sheet pile 12.

[0042] In this way, the present application completely wraps the exposed metal area formed during welding by arranging the thickened layer 142 of the concrete cushion layer 14 at the connecting part of the steel sheet pile 12 and the bearing platform 11, so that the exposed metal area formed due to high temperature damage during welding is not directly exposed to seawater or a highly corrosive environment, preventing the contact between corrosive medium (water, chloride ions, oxygen) and the metal surface, avoiding the invasion of corrosive medium, and eliminating the corrosion initiation point.

[0043] At the same time, this structure design does not need to be post-welded and coated, significantly reducing the construction cost and construction period, avoiding the secondary corrosion failure problem caused by the mismatch of adhesion and durability in the traditional coating process, and ensuring the continuity and integrity of the corrosion resistance of the connecting part.

[0044] In addition, since the connecting part is tightly wrapped by the high-strength and corrosion-resistant concrete thickened layer 142, the overall stiffness and stability of the connecting node can also be enhanced, and the concrete coating layer can uniformly transmit stress, reduce stress concentration, protect the reinforcing member 16 from external force impact or wear, improve the service life of the revetment pile structure in a corrosive environment, and prolong the service period of the steel sheet pile connection structure.

[0045] It can be explained that during construction, one end of the steel sheet pile 12 along its length direction is poured into the pile cap 11, and the pouring length of the steel sheet pile 12 is less than the thickness of the concrete protective layer, for example, the pouring length of the steel sheet pile 12 is 50mm.

[0046] In one embodiment, as shown in Figure 1 The steel sheet pile connecting structure further includes a square pile 15 installed at the bottom of the pile cap 11, and the square pile 15 is arranged in a spaced manner with the steel sheet pile 12.

[0047] In this way, the square pile 15 acts as a vertical support member, and by arranging the square pile 15 in a spaced manner with the steel sheet pile 12, the square pile 15 can work cooperatively with the steel sheet pile 12 to jointly bear the load from the upper pile cap 11 and directly and efficiently transmit the vertical load to the deep foundation, thereby significantly reducing the vertical pressure borne by the steel sheet pile 12.

[0048] At the same time, the square pile 15 itself has a certain rigidity, and its existence can effectively constrain the deformation of the soil behind the steel sheet pile 12 and form a complement with the steel sheet pile 12, so that the composite system can provide more solid and reliable support, thereby further guaranteeing the integrity and safety of the supporting structure.

[0049] In one embodiment, as shown in Figure 1 and Figure 2 The reinforcing member 16 is provided with a plurality of reinforcing members 16 arranged in a spaced manner.

[0050] In this way, by providing a plurality of reinforcing members 16 arranged in a spaced manner, the relative displacement between the steel sheet pile 12 and the pile cap 11 is jointly constrained in the longitudinal and transverse directions, the rigidity of the node and the entire supporting structure is enhanced, and the supporting structure can more effectively resist the shear force and bending moment caused by the soil pressure, water pressure and earthquake and the like, thereby reducing the structural deformation and improving the overall stability.

[0051] Preferably, the plurality of reinforcing members 13 are arranged in an array, such as a matrix array.

[0052] In one embodiment, as shown in Figure 1 and Figure 2 The pile cap 11 is embedded with a pile cap reinforcement 111, and the pile cap reinforcement 111 is anchored and connected with the reinforcing member 16 through the connecting member 13.

[0053] In this way, the reinforcing member 16 is anchored and connected with the reinforcement skeleton inside the pile cap 11, the steel sheet pile 12 and the pile cap 11 are reliably rigidly connected, the ability of the node to resist bending moment and shear force is enhanced, and it is ensured that the load received by the reinforcing member 16 can be efficiently dispersed into the pile cap 11 and jointly borne by the pile cap reinforcement 111, thereby effectively avoiding the damage of the pile cap 11 concrete due to stress concentration and guaranteeing the safety and durability of the pile cap 11 itself.

[0054] It should be noted that the arrangement of the plurality of connecting pieces 13 is consistent with the main reinforcement spacing of the pile cap reinforcement 111.

[0055] It should be noted that the connecting pieces 13 provided in the above embodiments are selected to be steel bars.

[0056] During installation, the connecting mode of the connecting pieces 13 with the pile cap reinforcement 111 and the reinforcing member 16 is preferably welding.

[0057] Of course, in other alternative embodiments, reliable connecting modes such as mechanical connection can also be used.

[0058] Specifically, the connecting length of the connecting pieces 13 with the steel sheet pile 12 needs to meet the specification requirement of anchoring length, for example, when single-sided welding is selected, the welding length is ten times the diameter of the steel bar, and when double-sided welding is selected, the welding length is five times the diameter of the steel bar.

[0059] It should be noted that the connecting pieces 13 are anchored into the pile cap 11, and the anchoring length needs to meet the specification requirement of anchoring length, and the seismic zone is according to the seismic anchoring length.

[0060] In one embodiment, as shown in Figure 1 and Figure 2 , the thickened layer 142 is located at the soil side d of the steel sheet pile 12.

[0061] In this way, by arranging the thickened layer 142 of the plain concrete cushion layer 14 at the soil side d of the steel sheet pile 12, the welding points can be directly covered, the penetration path of soil corrosion medium to the bare metal is blocked, and the corrosion starting point is eliminated.

[0062] It should be noted that the steel sheet pile connecting structure further includes a corrosion-resistant coating, and the corrosion-resistant coating is coated on the outer wall of the steel sheet pile 12.

[0063] In this way, by providing the corrosion-resistant coating on the outer wall of the steel sheet pile 12, the corrosion-resistant coating serves as a basic corrosion barrier, effectively isolating the direct contact of corrosion media such as seawater and salt mist with the outer wall of the steel sheet pile 12, and reducing the corrosion risk of the steel sheet pile 12 in the non-welding area.

[0064] At the same time, the corrosion-resistant coating and the thickened layer 142 of the plain concrete cushion layer 14 work together to form a protection mode of overall corrosion protection of the outer wall and precise protection of the welding points, prolonging the service life of the steel sheet pile 12.

[0065] In one embodiment, as shown in Figure 1 , the reinforcing member 16 is installed on the outer wall of the soil side d of the steel sheet pile 12, and the reinforcing member 16 is arranged in the length direction of the steel sheet pile 12.

[0066] With this configuration, the reinforcement 16 is arranged along the length direction, which enhances the ability of the steel sheet pile 12 section to resist bending deformation caused by earth pressure, thereby improving the stiffness and bending modulus of a single steel sheet pile 12, reducing pile body deflection under huge lateral earth pressure, and ensuring the flatness and effectiveness of the support wall.

[0067] Meanwhile, the concentrated loads from the pile cap 11 and transmitted through the connector 13, as well as the concentrated stresses in the earth pressure, can be effectively distributed to a larger area of ​​the sheet pile 12 by the reinforcement 16, transforming point loads or line loads into more uniformly distributed loads, optimizing the load transfer path, avoiding structural damage caused by excessive local stress, thereby improving the overall load transfer efficiency and stability from the sheet pile 12 to the foundation soil.

[0068] Among them, such as Figure 2 As shown, during installation, the top of the reinforcement member 16 extends above the top of the sheet pile 12.

[0069] In one embodiment, such as Figures 1 to 3 As shown, there are multiple reinforcing members 16, which are arranged at intervals along the horizontal direction.

[0070] This configuration, by setting multiple horizontally spaced reinforcement members 16, ensures that the soil pressure and external load are evenly distributed on the sheet pile 12, effectively avoiding stress concentration caused by single-point reinforcement, improving the overall stiffness and bending resistance of the sheet pile 12, and reducing the risk of local bending, deformation or instability of the sheet pile 12 due to soil pressure in seawater or highly corrosive environments.

[0071] It can be noted that the reinforcement 16 provided in the above embodiments is selected as a steel bar.

[0072] It can be noted that in the above embodiments, the cross-section of the sheet pile 12 is in the form of a straight line, a U-shape, or a Z-shape.

[0073] Secondly, the present invention also provides an ecological revetment, including a revetment body 2 and a steel sheet pile connection structure.

[0074] Among them, the sheet pile connection structure is the sheet pile connection structure provided by the former, and the sheet pile connection structure is installed on the water-facing side c of the revetment body 2.

[0075] This setup is because the ecological revetment includes a sheet pile connection structure, which has the same effect as the sheet pile connection structure, and will not be elaborated further here.

[0076] In one embodiment, such as Figure 2 As shown, the water-facing side c of the revetment body 2 is provided with an aquatic plant platform 21 for planting submerged or emergent plants 31.

[0077] Thus, by arranging the aquatic plant platform 21 on the water side c of the revetment body 2, the shear strength and cohesion of the matrix can be increased, the discrete soil particles can be integrated into a complex, and the structural stability can be improved. When the water impact acts on the revetment interface, the underwater stem and leaf system of the plant can dissipate the kinetic energy of the water flow, reduce the shear stress and scour rate of the shoreline, and help to slow down the water flow. At the same time, the underwater stem and leaf and root system can provide shelter and breeding environment for small aquatic organisms, so that the ecological and landscape of the revetment section are better.

[0078] In one embodiment, as shown in FIG. 1, the soil side of the revetment body 2 is provided with a terrestrial plant platform 22 for planting grasses, shrubs 32 and trees 33. Figures 1 to 3 Figure 4 Figure 4

[0079] It can be explained that the backfill area 21 is paved with a planting layer, and the bottom of the planting layer is provided with a ploughed soil layer and a soil protection blanket layer.

[0080] It can be explained that the top of the pile cap 11 is provided with a warning pile 17.

[0081] It can be explained that the backwater side of the revetment body 2 is provided with a road for traffic use.

[0082] It can be explained that the backwater side of the revetment body 2 is provided with a drainage ditch 5, and the drainage ditch 5 is arranged behind the road 4 for regional drainage.

[0083] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.​

Claims

1. A steel sheet pile connection structure, characterized in that, include: Platform(11); Sheet piles (12) are configured to be anchored to the cap (11) via reinforcements (16); The plain concrete cushion layer (14) has a base layer (141) and a thickening layer (142). The base layer (141) and the thickening layer (142) are stacked in the height direction. The base layer (141) is evenly laid on the bottom of the foundation (11), and the thickening layer (142) is laid on the bottom of the base layer (141). The thickening layer (142) is configured to cover the connection between the reinforcement member (16) and the sheet pile (12).

2. The sheet pile connection structure according to claim 1, characterized in that, Sheet pile connection structures also include: Square piles (15) are installed at the bottom of the foundation (11), and the square piles (15) and the sheet piles (12) are arranged at intervals.

3. The sheet pile connection structure according to claim 1, characterized in that, The reinforcement (16) is provided in a plurality of such reinforcements (16) arranged at intervals.

4. The sheet pile connection structure according to claim 1, characterized in that, The thickened layer (142) is located on the soil-facing side (d) of the sheet pile (12).

5. The sheet pile connection structure according to claim 1, characterized in that, The foundation (11) is embedded with foundation steel bars (111), and the foundation steel bars (111) and the reinforcement members (16) are anchored together by connectors (13).

6. The sheet pile connection structure according to claim 1, characterized in that, The cross section of the sheet pile (12) is in the shape of a straight line, a U-shape, or a Z-shape.

7. The sheet pile connection structure according to claim 1, characterized in that, Sheet pile connection structures also include: An anti-corrosion coating is applied to the outer wall of the steel sheet pile (12).

8. An ecological bank protection system, characterized in that, include: Bank protection body (2); The sheet pile connection structure is the sheet pile connection structure according to any one of claims 1-7, and the sheet pile connection structure is installed on the water-facing side (c) of the revetment body (2).

9. The ecological bank protection according to claim 8, characterized in that, The water-facing side (c) of the revetment body (2) is provided with an aquatic plant platform (21) for planting submerged or emergent plants (31).

10. The ecological bank protection according to claim 8, characterized in that, The earth-facing side (d) of the revetment body (2) is provided with a terrestrial plant platform (22) for planting grasses, shrubs (32) and trees (33).

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