Sea floor corrosion-proof and silt-promoting system and its uses

An anti-erosion and seagrass technology, applied in marine engineering, pipeline laying and maintenance, water conservancy engineering and other directions, can solve the problems of increased construction difficulty due to self-weight, poor effect, slow subsidence, etc., to improve the bearing capacity of the seabed and improve the effect. , good effect of wave elimination and slow flow

Inactive Publication Date: 2008-09-17
INST OF OCEANOLOGY - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sandbag method is used to support the suspended section of the pipeline laid on the seabed within a water depth of 50m (see figure 1 ), the simplest and most cost-effective, but the tests in the North Sea show that traditional sandbags are not very effective in protecting pipelines from mechanical damage
The method of throwing gravel is widely used to deal with the problem of suspended pipelines. It can be thrown along all the suspended sections of the pipeline, and gravel can also be thrown at several points in the suspended section of the pipeline to form gravel piles to protect the pipeline. , further maintenance and control are required due to stone settling
Although the asphalt settling bed has good flexibility, it is considered to be more suitable for protecting the exposed section of the pipel

Method used

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  • Sea floor corrosion-proof and silt-promoting system and its uses
  • Sea floor corrosion-proof and silt-promoting system and its uses
  • Sea floor corrosion-proof and silt-promoting system and its uses

Examples

Experimental program
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Effect test

Embodiment 2

[0046] The difference from Example 1 is:

[0047] Wherein the blade is made of polypropylene material with a specific gravity of 0.68g / cm 3 .

[0048] Submarine anti-erosion and silt-promoting system application: directly fix the artificial seagrass of the net-like flexible frame structure on the coastline where the seabed moves through the anchoring system (the seabed that needs to promote siltation or prevent erosion).

[0049] The present invention carries out the research result of artificial seaweed promoting sedimentation experiment. The results showed that the greater and denser the seagrass laying, the greater the reduction in flow velocity near the seafloor surface. Figure 9 Shown is the comparison of seafloor velocity when the beach without seagrass and the beach with seagrass experience the same tidal process, and the measurement results show that the beach velocity with the seagrass of the present invention is obviously smaller than the beach velocity without th...

Embodiment 3

[0051] The difference from Example 1 is:

[0052] Wherein the specific gravity of the blade material is 0.4g / cm 3 . Subsea anti-erosion and sedimentation promotion systems are applied on the upper surface of pipelines laid on the seabed (see Figure 7-2 , wherein: the pipeline represented by the black long frame is covered by the artificial seaweed of the net-like flexible frame structure, 8 pieces of artificial seagrass of the net-like flexible frame structure in this embodiment are connected together and laid above the pipeline, and the position of each piece of anchoring system is laid see Figure 7-3 ).

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Abstract

The invention relates to a sea floor sedimentation promoting technology, in particular to a sea floor corrosion-resistant and sedimentation-promoting system and the application thereof. The sea floor corrosion-resistant and sedimentation-promoting system includes fixing man-made seaweed with a net-shaped flexible frame structure to the sea floor structure through an anchorage system; the man-made seaweed has flexible branches and trunk, the seaweed lamina has a curtain-shaped structure, pressed strings pass through on the flexible branches and trunk to form a string-shaped structure flaky structure capable of naturally dispersing, the bottom of the branches and trunk is connected with the flexible frame structure connecting on the anchorage system. The anchorage system is composed of a retractable elastic lamina, a support bar tied with a cable and a stud. The topmost part of the lamina is fixedly connected with the support bar, which is integrally arrowhead structured, the support bar is grafted with the stud, the free end of the cable tied on the support bar is connected with the flexible frame. The sea floor corrosion-resistant and sedimentation-promoting system is characterized by better effects of corrosion resistance and sedimentation promoting management, simple structure, convenient installation and processing, and low cost.

Description

technical field [0001] The invention relates to seabed silting promotion technology, in particular to a seabed anti-erosion and silting promotion system and its application. Background technique [0002] Since the 1980s, along with the development of my country's submarine oil and gas resources, a large number of submarine oil and gas pipelines (sea pipelines) have been successively laid on the offshore seabed. The spatial position of the subsea pipeline has obvious changes, and further development may cause the submarine pipeline to be completely suspended, thus endangering the safety of the pipeline. [0003] At present, the commonly used protection methods include piled sandbags, throwing gravel, and asphalt bed on the seabed near the pipeline. The sandbag method is used to support the suspended section of the pipeline laid on the seabed within a water depth of 50m (see figure 1 ), the simplest and most cost-effective, but tests in the North Sea show that traditional san...

Claims

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Application Information

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IPC IPC(8): E02B3/00F16L1/16
Inventor 阎军范奉鑫杨存黄健福
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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