Flexible energy-dissipating flow-guiding anti-scour device and application method

Abstract

The invention discloses a flexible energy-dissipating flow-guiding anti-scour device and an application method. The device is used for local scour protection of a pile foundation and comprises a flexible protective sleeve, a rigid guide plate and a flexible protective pad, wherein the flexible protective sleeve is arranged on a pile in a wrapping mode, the rigid guide plate is arranged at the topof the flexible protective sleeve, and the flexible protective pad is laid on the periphery of the pile foundation. According to the flexible energy-dissipating flow-guiding anti-scour device, the flexible protective sleeve is utilized to absorb kinetic energy of incoming flow, so that the velocity of the incoming flow is reduced; the rigid guide plate is utilized to block and disinfect descendingwater flow from a water surface of the pile foundation, so that the volume and direction of the descending water flow are changed, the descending water flow is forced to be divided towards two sides,and the intensity of a horseshoe-shaped vortex is reduced; the flexible protective pad is utilized to protect the bottom of the foundation, so that impact energy of the descending water flow is reduced, the energy of the incoming flow at the sea bottom mainly acts on the flexible protective pad, and consequently the effects of transporting and undercutting on sea bottom soil are avoided; and theflexible protective pad has good collaborative adaptability to sea beds with different pile foundations, thereby being suitable for various complicated sea bottom surfaces.

Description

technical field [0001] The invention relates to a foundation protection device for a fixed structure on water and an application method, in particular to a flexible energy dissipation, diversion and anti-scour device for a pile foundation, belonging to the technical fields of marine engineering and hydraulic engineering. [0002] technical background [0003] The pile foundation mentioned in the present invention is mainly the foundation part of bridge piers or piles driven into the seabed as supports of bridges, wharfs, trestle roads or fixed platforms. In the shallow sea and intertidal zone to build wind turbine foundations, bridges, jacket platforms, jack-up platforms and other fixed structures on the water, due to the action of tides and ocean currents, the soil around the foundations will be washed away, taking away piles and foundations. The surrounding sediment will reduce the bearing capacity of the pile body. When the pile foundation is exposed to a certain extent, i...

AI Technical Summary

Problems solved by technology

In practice, methods such as underwater riprap, expanded foundation protection, and concrete sinking pads have achieved a certain degree of erosion prevention and control effect, but solid objects such as underwater riprap are much more rigid than the seabed, and they are still harmful to the sea. The sediment on the bed has been severely washed away, leading to the occurrence of the "secondary erosion" problem on the seabed. The seawater continues to take away the sediment, and the stones sink. After a period of time, the stones will sink below the mud surface and have no protective effect. , so it is necessary to keep throwing stones to maintain the elevation of the mud surface

To ensure that the scour does not develop into the foundation within the service life, it is necessary to deal with a large area around the foundation, which is expensive and difficult to maintain later.

Pile body slit protection, pile front row pile protection and submerged sill protection are limited by water flow direction, and are mainly suitable for scour protection of pier piers in rivers. The protection effect is not obvious in the offshore environment, and it is laborious, time-consuming and consumes a lot of materials

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