Composite tension sand blocking and silt reducing facility and method

Abstract

The invention provides a composite tension sand blocking and silt reducing facility and method.The facility is composed of one or more units, each unit comprises a floating body, a composite tension curtain and an anchor point located at the bottom of a water body, one end of the composite tension curtain is connected to the floating body, and the other end of the composite tension curtain is connected to the anchor point; the composite tension curtain forms a sand blocking surface in the water between the bottom of the water body and the floating body by virtue of the buoyancy of the floating body, and the floating body is positioned on the water surface or suspended in the water; the composite tension curtain is formed by sewing two layers of geotechnical cloth together, a plurality of steel cables are inserted between the two layers of geotechnical cloth, a composite tension structure is formed to serve as a sand blocking and silt reducing curtain face, and main water flow force and wave force are borne by the steel cables. The flexible sand blocking curtain structure facility is economical, convenient to construct, suitable for large flow velocity and wave conditions and capable of blocking sand and reducing silt.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy engineering, and in particular to a composite tension sand-trapping and silt-reducing facility and method. Background Art

[0002] Among existing breakwaters, vertical, sloped, and hybrid types are the most common traditional types of breakwaters. Currently, limited methods exist for controlling sediment re-accumulation in silt- and silty-sand coastal harbors and waterways. The most effective measure is to extend the guide dike beyond the sediment flow zone to minimize sediment inflow and ultimately reduce sedimentation. However, for the ocean, the cost per meter of guide dike increases rapidly as it extends into deeper offshore waters.

[0003] Traditional sand and silt-reducing structures are mostly gravity-based rigid structures. Research on new sand and silt-reducing structures, such as flexible sand curtains, is still in its early stages. While traditional sand curtains have been accepted in specific projects such as dredging and land reclamation, they suffer from significant drawbacks that hinder their further application: First, due to limitations in material strength and construction techniques, sand curtains can only be used in weak wave and current conditions; second, they are often only temporary structures, limiting their application; and third, they cannot provide full-depth protection.

[0004] After searching, it is found in the prior art that there is a disclosed underwater flexible curtain for preventing the spread of mud and sand, which includes an underwater curtain, a surface float, a first connecting rope, a ballast block, a second connecting rope, a pendant, and a seabed. A surface float is arranged above the underwater curtain, and the two ends of the surface float are respectively connected to the two ballast blocks by the first connecting rope. The two sides below the underwater curtain are respectively connected to the two pendants by the second connecting rope. The two pendants and the two ballast blocks are all arranged on the seabed. In this prior art, the upper and lower ends of the curtain are restricted from displacement along the direction of water flow, and the main water flow and wave forces are completely borne by the underwater curtain. Under the action of water flow, the curtain is like a horizontal parachute. On the one hand, when the flow rate is large (more than 0.5m / s), the force on the curtain body increases sharply. With this structural setting, the strength of the geotextile currently on the market cannot meet the application requirements of fast currents and large waves. On the other hand, it cannot be enclosed at full water depth. The lower edge of the curtain does not contact the bed surface. When used on silty sandy coasts, high-sand water bodies can pass through the gap below, and the sand-retaining effect cannot be effectively exerted. In addition, the curtain is fixed by concrete blocks. For waters with fast currents and large waves, in order to resist the large water flow and wave forces and prevent the device from being carried away by the water flow, larger concrete blocks need to be used, and larger lifting equipment is required, which brings difficulties to construction and increases costs.

[0005] Further research revealed double-sided wire-reinforced geotextiles. These have multiple ribs spaced longitudinally on one side of the main fabric layer and multiple ribs spaced transversely on the other side. Steel wire is inserted into the ribs, adding reinforcement to the surface layer to improve tensile strength and deformation resistance. However, these double-sided wire-reinforced geotextiles can only be custom-made at the factory, which also results in high costs.

[0006] Therefore, there is a need for a flexible sand retaining curtain structure facility that is economical, easy to construct, suitable for high flow velocity and wave conditions, and capable of retaining sand and reducing siltation. Summary of the Invention

[0007] In response to one of the defects in the prior art, the purpose of this application is to provide a composite tension sand-trapping and silt-reducing facility and method.

[0008] In a first aspect of the present application, a composite tension sand-trapping and silt-reducing facility is provided, comprising one or more units, each unit comprising: a floating body, a composite tension curtain, and an anchor point located on the bottom of the water body, wherein:

[0009] The float is used to provide buoyancy for the entire structure;

[0010] One end of the composite tension curtain is connected to the float, and the other end is connected to an anchor point. The composite tension curtain relies on the buoyancy of the float to form a sand retaining surface in the water between the bottom of the water body and the float. The float is located on the water surface or suspended in the water.

[0011] The composite tension curtain is composed of two layers of geotextiles sewn together, with multiple steel cables inserted between the two layers of geotextiles to form a composite tension structure as a sand-trapping and silt-reducing curtain surface. The main water flow force and wave force are borne by the steel cables.

[0012] Optionally, the floating body is a steel buoy, and a hook lock is provided on the steel buoy. One end of the composite tension curtain is connected to the hook lock of the steel buoy through a steel cable.

[0013] Optionally, the lower edge of one end of the composite tension curtain connected to the anchor point is in close contact with the bottom surface of the water body.

[0014] Optionally, the geotextile is a flexible polypropylene woven geotextile.

[0015] Optionally, the anchor point is a PHC pile, one end of which is driven into the bottom surface of the water body, and the other end is connected to the composite tension curtain through the steel cable.

[0016] Optionally, there are multiple PHC piles, each of which is connected to one steel cable, and the multiple PHC piles and the multiple steel cables are evenly spaced at the same distance.

[0017] Optionally, the multiple units are arranged at the sand-trapping location to form a sand-trapping curtain strip, wherein each unit is removable or replaceable.

[0018] Optionally, in the composite tension curtain, the steel cable is inserted along the direction from the floating body to the anchor point.

[0019] Optionally, in the composite tension curtain, the steel cables are interspersed in a wave shape between two layers of geotextiles.

[0020] In a second aspect of the present application, a composite tension sand-trapping and silt-reducing method is provided, which uses any of the composite tension sand-trapping and silt-reducing facilities described above, comprising:

[0021] Secure anchor points to the bottom bed of the water body;

[0022] Prepare a composite tension curtain, which is composed of two layers of geotextile sewn together, with multiple steel cables inserted between the two layers of geotextile to form a composite tension structure as a sediment retention and silt reduction curtain surface;

[0023] One end of the composite tension curtain is connected to a floating body, and the other end is connected to an anchor point. The composite tension curtain relies on the buoyancy of the floating body to form a sand-retaining surface in the water between the bottom surface of the water body and the floating body; the floating body is located on the water surface or suspended in the water;

[0024] When water flow, waves and / or the deadweight of sediment act on the composite tension curtain, the composite tension curtain disperses and transfers the force to the steel cables between the composite tension curtains. The steel cables then transfer the force of the entire structure to the anchor points, completing the transmission of the composite tension force and achieving sand retention and silt reduction.

[0025] Optionally, the anchor point is a PHC pipe pile, which fixes the entire sand-trapping and silt-reducing facility in the target area; one end of the PHC pipe pile is driven into the bottom bed of the water body, and the other end is connected to the composite tension curtain through the steel cable, and the horizontal force and vertical force transmitted by the steel cable are resisted by embedding the PHC pipe pile with the bottom soil of the water body.

[0026] The composite tension sand-trapping and silt-reducing facility and method provided by the present application has a floating body end that does not restrict displacement along the water flow direction. At the same time, a composite tension curtain is formed by inserting steel cables between two layers of geotextiles. The main water flow force and wave force are borne by the steel cables instead of the geotextiles, which greatly improves the device's ability to resist water flow and wave effects. At the same time, it can be manufactured using the existing two layers of geotextiles without customization and at a low cost. It is an economical, easy-to-construct flexible sand-retaining curtain structure facility that is suitable for high flow rates and wave conditions and can trap sand and reduce silt.

[0027] Other technical effects brought about by the additional features will be further explained in the corresponding embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0029] Figure 1 Schematic diagram of the structure of a composite tension sediment retention and silt reduction facility according to an exemplary embodiment;

[0030] Figure 2 is a cross-sectional view of a composite tension curtain of a composite tension sediment-trapping and silt-reducing facility according to an exemplary embodiment;

[0031] Figure 3 FIG1 is a schematic diagram showing force transmission of a composite tension sediment retention and silt reduction facility according to an exemplary embodiment;

[0032] Figure 4 Schematic diagram showing the connection between the steel buoy and the composite tension curtain in a composite tension sediment retention and silt reduction facility according to an exemplary embodiment;

[0033] In the figure: 1-floating body, 2-geotextile, 3-steel cable, 4-anchor point, 5-acting force, 6-structure buoyancy, 7-anchor pile tension, 8-structure deadweight, 9-hook. DETAILED DESCRIPTION

[0034] The present application is described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present application, but are not intended to limit the present application in any form. It should be noted that, without departing from the concept of the present application, a number of variations and improvements may be made by those skilled in the art, and these all fall within the scope of protection of the present application. Parts not described in detail in the following examples may be implemented using existing technologies.

[0035] Existing flexible sand curtains, which are structures that block sand and reduce silt, are not well suited to high flow rates and wave conditions, or their cost is relatively high. Based on the above problems, the present invention provides a composite tension sand and silt removal facility to achieve an economical, easy-to-construct flexible sand curtain structure facility that is suitable for high flow rates and wave conditions and can block sand and reduce silt.

[0036] Reference Figure 1 、 2As shown, in one embodiment of the present application, the composite tension sand-trapping and silt-reducing facility is composed of one or more units, each unit including: a float 1, a composite tension curtain and an anchor point 4 located on the bottom bed of the water body, wherein: the float is used to provide buoyancy for the overall structure; one end of the composite tension curtain is connected to the float 1, and the other end is connected to the anchor point 4, and the composite tension curtain relies on the buoyancy of the float to form a sand-trapping surface in the water between the bottom bed of the water body and the float 1, and the float 1 is located on the water surface or suspended in the water; the composite tension curtain is composed of two layers of geotextiles 2 sewn together, and a plurality of steel cables 3 are inserted between the two layers of geotextiles 2 to form a composite tension structure as a sand-trapping and silt-reducing curtain surface, and the main water flow force and wave force are borne by the steel cables 3.

[0037] In this embodiment, two layers of geotextiles 2 and steel cables 3 are used, and a composite tension structure is formed by inserting steel cables between the two layers of fabric. As long as the geotextiles on the market are used for processing, no customization is required, and the cost is low. At the same time, the float does not limit the displacement along the water flow direction. The main water flow force and wave force are borne by the steel cable 3 instead of the geotextile, which greatly improves the ability of the device to resist water flow and wave effects. It can be used in waters with high flow rate and wave height, but the strength cannot meet the application requirements of fast flow and large waves.

[0038] In order to facilitate construction, in one embodiment, refer to Figure 4 As shown, the float 1 is a steel buoy equipped with a hook lock. One end of the composite tension curtain is connected to the hook lock 9 of the steel buoy via a steel cable. In this structural arrangement, the steel buoy provides buoyancy for the entire structure. The steel cable 3 connected to the steel buoy allows the structure to form a sand-trapping surface in the water. Under natural conditions, the float 1 can float or submerge in the water. During construction, the hook lock and steel cable 3 are used to achieve secure installation, making it easy and unnecessary to perform complex operations.

[0039] Specifically, the steel cable 3 is inserted into the two layers of geotextile, and the two layers of geotextile are sewn and fixed to ensure that the steel cable fits tightly with the two layers of geotextile. One end of the steel cable 3 is fixed to the hook lock 9 of the steel buoy, and the other end is fixed to the anchor point 4 located on the bottom bed of the water body. The buoyancy of the steel buoy provides an upward force for the composite curtain composed of the steel cable and the geotextile, thus forming a sand retaining surface in the water. Furthermore, by adjusting the position of the steel buoy so that the hook lock is aligned with the connecting end of the steel cable, the steel cable is inserted into the hook lock to complete the quick connection. The number of connections between the steel buoy and the steel cable can be set according to the needs of the actual application scenario, such as 10 groups, with a connection spacing of 3-5m between each group.

[0040] Existing flexible sand curtains operate in a parachute-like manner. The lower edge of this structure doesn't contact the waterbed, making it ineffective at retaining sand. To better retain sand and reduce siltation, the composite tension curtain in the above-mentioned embodiment maintains close contact with the waterbed at one end connected to the anchor point. This allows for wider application. For example, on silty sandy coasts, the water near the seabed often contains a high concentration of sand, reaching tens of kilograms per cubic meter. This is known as the near-bottom high-sand layer, while the surface layer has a concentration of about one kilogram per cubic meter or even less. In these waters, retaining the higher-sand content near the seabed is more important. If the curtain is suspended from the seabed, with its lower edge not in contact, high-sand water can pass through the gap below when used on silty sandy coasts, effectively retaining the sand. In this embodiment, the lower edge of the curtain is in close contact with the seabed, thereby retaining more of the high-sand content near the seabed.

[0041] Reference Figure 1 、 2 As shown, in order to achieve the effect that the lower edge of the above-mentioned curtain is always in close contact with the bed surface, in one embodiment of the present application, the anchor point 4 located on the bed surface at the bottom of the water body can adopt a pile structure to fix the entire sand interception and silt reduction facility in the target area. Specifically, the pile can preferably be a PHC pipe pile, one end of the PHC pipe pile is driven into the bed surface at the bottom of the water body, and the other end is connected to the composite tension curtain through a steel cable 3. Preferably, there are multiple PHC pipe piles, each of which is connected to a steel cable 3 in the composite tension curtain, thereby ensuring that the lower edge of the curtain is always in close contact with the bed surface.

[0042] Of course, in some embodiments, multiple steel cables 3 are connected to multiple anchor points 4, and multiple steel cables 3 and multiple anchor points 4 (PHC piles) are evenly spaced to form a uniformly stressed curtain structure that can better withstand the effects of water flow and waves. In addition, the insertion direction of the steel cables in the composite tension curtain is along the direction from the float to the anchor point. In this way, the anchor point 4 is formed by piling on the bed surface, and then the composite tension curtain is fixed on the pile, and the horizontal force and vertical force transmitted by the steel cables are resisted by embedding the pile and the soil. Figure 3 shown.

[0043] In order to adapt to more usage scenarios, the composite tension sand-trapping and silt-reducing facility can be composed of one unit or multiple units. One unit is suitable for smaller sand-trapping scenarios. For larger sand-trapping scenarios, the above-mentioned multiple units are used to form a composite tension sand-trapping and silt-reducing facility. Multiple units are arranged at the sand-trapping location to form a sand-trapping curtain strip. The specific size of each unit can be adjusted according to the needs of the actual sand-trapping location. The composite tension curtain can be produced on the construction site, or it can be produced in advance and then directly installed on site.

[0044] In addition, after the facility has been used at the same location for a long time, the composite tension curtain or a unit may be damaged. Through the setting of the above-mentioned structure (such as hook locks, steel cable connections, etc.), each unit or the composite tension curtain in each unit can be disassembled, so that replacement can be easily achieved, which greatly reduces the cost of existing sand and silt reduction facilities and reduces the difficulty of construction and maintenance.

[0045] In the above embodiment, the geotextile is made of a flexible polypropylene woven geotextile, which can be a high-strength polypropylene woven geotextile. Based on the structural design, the geotextile itself provides enhanced tear resistance, allowing it to withstand significant current and wave forces. Furthermore, the composite tension curtain exhibits excellent flexibility, adapting to complex ocean current conditions.

[0046] In the above embodiment of the present application, water flow, waves and the deadweight of sediment act on the composite tension curtain, and the composite tension curtain disperses and transfers the force to the steel cables 3 between the composite tension curtains. The steel cables 3 then transfer the force of the entire structure to the anchor points 4, completing the transmission of the composite tension force and improving the overall force and stability of the structure.

[0047] In the above embodiment of the present application, in the composite tension curtain, steel cables are inserted between the two layers of geotextiles. The specific insertion method can also be diverse. For example, the simplest method is to directly insert the steel cables into the middle of the two layers of geotextiles in a straight line. That is, the two layers of high-strength woven geotextiles are sewn together. In the horizontal direction, every 3 to 5 meters (the specific value is determined according to the on-site wave and flow conditions), steel cables are inserted between the two layers of geotextiles to form a high-strength sand-trapping structure. The geotextile itself is available on the market and has a low processing and manufacturing cost. This insertion method is the simplest and lowest cost, and can also be applied to sand-trapping and silt-reducing conditions with high flow rates and wave conditions.

[0048] Based on the same technical concept, another embodiment of the present application further provides a composite tension sand trap and silt reduction method, which is performed using the composite tension sand trap and silt reduction facility in any of the above embodiments. Specifically, the composite tension sand trap and silt reduction method includes the following steps:

[0049] S1, fixed anchor point on the bottom bed of water body;

[0050] S2, prepare a composite tension curtain, which is composed of two layers of geotextile sewn together, with multiple steel cables inserted between the two layers of geotextile to form a composite tension structure as a sediment retention and silt reduction curtain surface;

[0051] S3, one end of the composite tension curtain is connected to the floating body, and the other end is connected to the anchor point. The composite tension curtain relies on the buoyancy of the floating body to form a sand retaining surface in the water between the bottom surface of the water body and the floating body; the floating body is located on the water surface or suspended in the water;

[0052] like Figure 3 As shown, the composite tension curtains are acted upon by currents, waves, and the weight of sediment. These disperse the forces and transfer them to the steel cables 3 between them. These cables then transmit the forces acting on the entire structure to anchor points 4, completing the transmission of the composite tension forces and improving the overall structure's stress resistance and stability. Floating body 1 suspends the entire structure at a designated location in the water, thereby trapping sediment and reducing siltation at a specific location.

[0053] Reference Figure 3 As shown in, 5-acting force, 6-structure buoyancy, 7-anchor pile tension, 8-structure deadweight.

[0054] In the above embodiment, the anchor point is a PHC pipe pile, which fixes the entire sand-trapping and silt-reducing facility in the target area. One end of the PHC pipe pile is driven into the bottom bed of the water body, and the other end is connected to the composite tension curtain via a steel cable. The horizontal and vertical forces transmitted by the steel cable are resisted by the embedding of the PHC pipe pile and the soil at the bottom of the water body. When the composite tension facility is installed, a certain number of composite tension facility units can be arranged at the sand-trapping location to form a sand-trapping curtain strip, which serves the purpose of sand-trapping and silt-reducing. When a unit is damaged, a new composite tension facility can be replaced according to the unit to maintain the overall sand-trapping effect.

[0055] The above steps S1 and S2 do not need to be performed in a strict order and can be performed sequentially or simultaneously. After determining the anchor point and preparing the composite tension curtain, the installation and construction of S3 can be carried out. The above-mentioned composite tension sand-trapping and silt-reducing facility structure and method can be installed on-site without the need for complex and costly procedures such as factory customization. For other steps not specifically described, refer to the features in the above-mentioned composite tension sand-trapping and silt-reducing facility embodiment.

[0056] This application can be used for reducing siltation in waterways, etc. The application scenario is to arrange the composite tension sand-trapping and silt-reducing facility of this application outside the waterway, and reduce the suspended sediment entering the waterway through this composite tension sand-trapping and silt-reducing facility, thereby reducing the accumulation of suspended sediment in the waterway waters, thereby achieving the purpose of reducing waterway siltation. Of course, the scope of application of the sand-trapping and silt-reducing structure is not limited to waterways, but can also be used in various water bodies such as docks and temporary construction areas at sea to intercept and reduce siltation.

[0057] The composite tension sand-trapping and silt-reducing facility and method provided in the present application does not restrict the displacement of the floating end along the water flow direction. A high-strength composite tension curtain is formed by inserting steel cables between the existing two layers of geotextiles, and a pile structure is used as an anchor point. The load is mainly borne by the steel cables and anchor points, which greatly improves the ability of the device to resist water flow and wave effects. It is low in cost and easy to construct, and can be used for sand-trapping and silt-reducing under high flow rates and wave conditions.

[0058] The preferred features of the above embodiments can be used alone in any embodiment, or in any combination without conflict. In addition, parts not described in detail in the embodiments can be implemented using existing technologies.

[0059] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0060] In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically defined. In the present application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the embodiments of the present application, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or apparatus.

[0062] The above describes some specific embodiments of the present application. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the substantive content of the present application.

Claims

1. A composite tension sediment trap and silt reduction facility, characterized in that: It consists of one or more units, each unit including: a floating body, a composite tension curtain and an anchor point located on the bottom of the water body, wherein: The float is used to provide buoyancy for the entire structure; One end of the composite tension curtain is connected to the float, and the other end is connected to an anchor point. The composite tension curtain relies on the buoyancy of the float to form a sand retaining surface in the water between the bottom of the water body and the float. The float is located on the water surface or suspended in the water. The composite tension curtain is composed of two layers of geotextiles sewn together, with multiple steel cables inserted between the two layers of geotextiles to form a composite tension structure as a sand-trapping and silt-reducing curtain surface. The main water flow force and wave force are borne by the steel cables.

2. The composite tension sediment-trapping and silt-reducing facility according to claim 1 is characterized in that: The floating body is a steel buoy, and a hook lock is provided on the steel buoy. One end of the composite tension curtain is connected to the hook lock of the steel buoy through a steel cable.

3. The composite tension sediment-trapping and silt-reducing facility according to claim 1 is characterized in that: The lower edge of one end of the composite tension curtain connected to the anchor point is in close contact with the bottom surface of the water body.

4. The composite tension sediment-trapping and silt-reducing facility according to claim 3 is characterized in that: The geotextile is a flexible polypropylene woven geotextile.

5. The composite tension sediment-trapping and silt-reducing facility according to claim 1 is characterized in that: The anchor point is a PHC pipe pile, one end of which is driven into the bottom bed of the water body, and the other end is connected to the composite tension curtain through the steel cable.

6. The composite tension sediment-trapping and silt-reducing facility according to claim 5 is characterized in that: There are a plurality of PHC piles, each of which is connected to a steel cable, and the plurality of PHC piles and the plurality of steel cables are evenly spaced at the same distance.

7. The composite tension sediment-trapping and silt-reducing facility according to claim 1 is characterized in that: The multiple units are arranged in an array at the sand-trapping location to form a sand-trapping curtain strip, wherein each unit can be disassembled or replaced.

8. The composite tension sediment-trapping and silt-reducing facility according to claim 1 is characterized in that: The composite tension curtain, wherein the steel cable is inserted along the direction from the floating body to the anchor point.

9. A composite tension sand-trapping and silt-reducing method, using the composite tension sand-trapping and silt-reducing facility according to any one of claims 1 to 8, characterized in that: include: Secure anchor points to the bottom bed of the water body; Prepare a composite tension curtain, which is composed of two layers of geotextile sewn together, with multiple steel cables inserted between the two layers of geotextile to form a composite tension structure as a sediment retention and silt reduction curtain surface; One end of the composite tension curtain is connected to a floating body, and the other end is connected to an anchor point. The composite tension curtain relies on the buoyancy of the floating body to form a sand-retaining surface in the water between the bottom surface of the water body and the floating body; the floating body is located on the water surface or suspended in the water; When water flow, waves and / or the deadweight of sediment act on the composite tension curtain, the composite tension curtain disperses and transfers the force to the steel cables between the composite tension curtains. The steel cables then transfer the force of the entire structure to the anchor points, completing the transmission of the composite tension force and achieving sand retention and silt reduction.

10. The composite tension sediment interception and silt reduction method according to claim 9, characterized in that: The anchor points are PHC piles, which fix the entire sediment interception and silt reduction facility in the target area; One end of the PHC pile is driven into the bottom bed of the water body, and the other end is connected to the composite tension curtain through the steel cable. The horizontal force and vertical force transmitted by the steel cable are resisted by embedding the PHC pile with the bottom soil of the water body.

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