Protection block special for seabed foundation pile and protection method

Abstract

The protection block special for the seabed foundation pile is characterized by comprising a main body, the bottom face of the main body is a plane, the upper portion of the main body is an arc-shaped face, a cavity is formed in the main body, a plurality of through holes are formed in the arc-shaped face, and the through holes communicate with the cavity; prefabricated special protection blocks are transported to the periphery of a seabed foundation pile through a ship, then the special protection blocks are evenly thrown into a pit of the seabed foundation pile through an inclined sliding barrel and stacked till a protection pile is formed, and water flow scouring protection is achieved on the seabed foundation pile; the special protection block has the advantages that the special protection block is of a streamline shape and a hollow structure, the impact flow speed of water flow is well reduced, meanwhile, the sediment gathering effect is enhanced, the supporting capacity of seabed foundation piles can be continuously improved within a long time, and the good water flow scouring resistance and protection effect on the seabed foundation piles are achieved.

Description

Technical Field

[0001] This invention relates to the field of submarine foundation pile protection technology, and in particular to a special protective block for submarine foundation piles and a protection method thereon. Background Technology

[0002] Offshore wind power, as an important source of clean energy, has become a crucial option for meeting global electricity demand and reducing greenhouse gas emissions. However, the construction and maintenance of offshore wind power facilities still face a series of challenges, one of which is the erosion resistance and stability of submarine monopile foundation systems. Ocean currents and wave loads impact the foundation piles, generating downwelling currents. Simultaneously, due to the high velocity of the surface current and the low velocity of the seabed current, a pressure gradient exists, forming a transverse vortex that moves downwards. The downwelling current carries the transverse vortex, forming a horseshoe vortex. Upon contact with the seabed surface, it continuously erodes the seabed, stirring up sediment. The accelerating currents on both sides of the foundation pile keep the stirred sediment suspended, gradually forming a horseshoe-shaped depression.

[0003] Currently, the common method for filling the depressions around the subsea piles is to pour solidified soil slurry. This can protect the subsea piles under certain circumstances. However, the pouring process requires a long curing time and the construction cycle is long. Before the solidified soil is fully solidified, the impact of the seabed water flow will cause 5% to 12% of the solidified soil to be lost. At the same time, the construction effect is greatly affected by the weather (such as rainfall, temperature changes, etc.). Different weather conditions will affect the solidification process of the solidified soil, resulting in uneven strength and density of the solidified soil, which will affect the protective effect on the subsea piles. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a special protective block and protection method for submarine foundation piles, which improves the ability to resist water erosion, reduces the impact of water flow and adverse weather on protection operations, and improves the quality and efficiency of operations.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a special protective block for submarine foundation piles, comprising a main body, wherein the bottom surface of the main body is a plane and the upper part is an arc-shaped surface, a cavity is provided inside the main body, and a plurality of through holes are provided on the arc-shaped surface, wherein the through holes are connected to the cavity.

[0006] Furthermore, the plane and the arcuate surface are connected by an arcuate edge transition.

[0007] Furthermore, the bottom surface is a circular plane.

[0008] Furthermore, the through holes are arranged in an array on the arc-shaped surface.

[0009] Furthermore, the protective block is made of clay, cement, curing agent, and water in a mass ratio of 9:0.8-1:1.8-2.5:3.2-4.

[0010] Furthermore, the curing agent is composed of 70-80% sodium silicate, 8-20% polyvinyl alcohol, 5-15% gypsum, and 0.5-1.5% aluminate accelerator by mass percentage.

[0011] The method of protecting seabed piles using the aforementioned special protective blocks involves transporting prefabricated special protective blocks to the vicinity of the seabed piles by ship, and then evenly throwing the special protective blocks into the pits of the seabed piles through an inclined chute and stacking them until a protective pile is formed, thereby protecting the seabed piles from water erosion.

[0012] Compared with the prior art, the advantages of the present invention are: (1) The prefabricated special protective blocks are stacked into the pits around the seabed piles by throwing, which reduces the time the ship operates near the seabed piles, shortens the operation cycle, reduces the impact of water flow and adverse weather on the protective operation, and improves the quality and efficiency of the protective operation. (2) The special protective block of the present invention adopts a streamlined shape and hollow structure, which effectively reduces the impact velocity of water flow, enhances the aggregation effect of sediment, and continuously improves the support capacity of the seabed pile over a long period of time, thus playing a good role in resisting water erosion and protecting the seabed pile. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the special protective block of the present invention; Figure 2 This is a front view of the special protective block of the present invention; Figure 3 for Figure 2 A sectional view; Figure 4 This is a schematic diagram of the stacking of the special protective blocks of the present invention in the pits around the submarine foundation piles; Figure 5 This is a schematic diagram illustrating the principle of the special protective block of the present invention for resisting water erosion. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] Example 1: As Figure 1-3As shown, a special protective block for submarine foundation piles includes a main body 1. The bottom surface of the main body 1 is a plane 11 and the upper part is an arc-shaped surface 12. The plane 11 and the arc-shaped surface 12 are connected by an arc-shaped edge 13 to enhance the protective block's resistance to water erosion. A cavity 2 is provided inside the main body 1. Multiple through holes 3 are arranged in an array on the arc-shaped surface 12. The through holes 3 are connected to the cavity 2.

[0016] In the above embodiments, the bottom surface of the main body 1 can be a circular plane, or a plane of other geometric shapes such as square or ellipse.

[0017] The principle of the special protective block in the above embodiment for resisting water erosion is as follows: Water flows from left to right onto the protective block, with high-speed water on the water-facing side and low-speed water on the water-repellent side. This high-speed flow effectively reduces the velocity of the water flow, thus resisting erosion. Meanwhile, the quicksand brought by the water flow enters the cavity 2 through the through-hole 3 of the protective block. The flow velocity inside the cavity 2 is extremely low, making it difficult for the low-velocity water to flush the quicksand out of the protective block. Therefore, the cavity 2 of the protective block has an excellent sand-gathering effect. Figure 5 As shown, this further enhances the protective block's resistance to water flow impact.

[0018] The prefabrication method of the special protective block of the present invention is as follows: (1) Take soil and conduct soil quality testing, and then send it to the soil screening and conveying mechanism to crush and screen the obtained soil to remove impurities in the soil. The soil particle size after crushing is less than 6mm. (2) A curing agent is obtained by uniformly mixing sodium silicate (75% by mass), polyvinyl alcohol (15%), gypsum (9%) and aluminate coagulant (1%). Then, the crushed soil (clay), cement, curing agent and water are added to the mixing tank in a mass ratio of 9:0.8:2:4 and stirred for 4 hours to obtain a uniform curing slurry. (3) Pour the solidified mud into the mold and cast it into shape. Under the conditions of temperature of 20-35℃ and relative humidity of 80-95%, seal it in a plastic bag and cure it for 7 days before demolding to obtain the solidified protective block. Then, under the conditions of temperature of 5-30℃ and relative humidity of 70-80%, cure it for 21 days to ensure the strength of the protective block, so that the compressive strength of the protective block after curing is ≥2.3MPa.

[0019] Since the special protective block of the present invention has a hollow structure, when casting it in the mold, the protective block can be cast in half to facilitate demolding. After demolding, the two halves are spliced ​​together with solidified mud, and then post-curing is carried out after it has solidified.

[0020] In the above embodiments, the component ratio of the curing agent can be selected from the range of 70-80% sodium silicate, 8-20% polyvinyl alcohol, 5-15% gypsum, and 0.5-1.5% aluminate accelerator by mass percentage, according to actual needs; and the component ratio of the protective block can be selected from the range of clay, cement, curing agent, and water by mass ratio of 9:0.8-1:1.8-2.5:3.2-4, according to actual needs.

[0021] Example 2: The method of protecting submarine piles using the special protective block from Example 1 is as follows: Prefabricated protective blocks are transported by ship to the vicinity of the seabed pile 4. Then, using a combination of inclined chute and water pump, the protective blocks are evenly dumped into the pits 5 around the seabed pile 4 and stacked until a protective pile is formed, thus protecting the seabed pile from water erosion. Figure 4 As shown; and the accumulation of silt in the cavities within the protective block will continuously improve the support capacity of the protective stack for the seabed piles.

[0022] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A special protective block for submarine foundation piles, characterized in that... The device includes a main body, the bottom of which is flat and the top is curved. A cavity is provided inside the main body, and multiple through holes are provided on the curved surface, which are connected to the cavity.

2. The special protective block for submarine foundation piles as described in claim 1, characterized in that: The plane and the arc-shaped surface are connected by an arc-shaped edge.

3. The special protective block for submarine foundation piles as described in claim 1, characterized in that: The bottom surface is a circular plane.

4. The special protective block for submarine foundation piles as described in claim 1, characterized in that: The through holes are arranged in an array on the arc-shaped surface.

5. A special protective block for submarine foundation piles as described in claim 1, characterized in that: The protective block is made of clay, cement, curing agent and water in a mass ratio of 9:0.8-1:1.8-2.5:3.2-4.

6. A special protective block for submarine foundation piles as described in claim 5, characterized in that: The curing agent is composed of 70-80% sodium silicate, 8-20% polyvinyl alcohol, 5-15% gypsum, and 0.5-1.5% aluminate accelerator by mass percentage.

7. A method for protecting submarine foundation piles using the special protective block described in claim 1, characterized in that: Prefabricated protective blocks are transported by ship to the vicinity of the seabed piles. Then, the protective blocks are evenly thrown into the pits of the seabed piles through inclined chute and stacked until a protective pile is formed, thus protecting the seabed piles from water erosion.

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