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

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...

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 pipeline in deep water. The disadvantage is that the extremely heavy self-weight increases the construction difficulty. sunken bed (see image 3 ), as with any rigid body, scour still occurs at the edges and causes slow settling, requiring further processing

[0004] In the prior art, there is a method of laying artificial seagrass-type sedimentation beds on the pipeline to solve the problem of seabed silting promotion. The artificial seaweeds are single branches, and the effect of erosion and silting promotion is not enough; there are also artificial seaweeds that are "planted" by anchors. In the method on the bottom of the sea, the structure of the anchor is a sheet with a guide mechanism tied with a rope (see Figure 4), the disadvantage is that the processing is inconvenient and the structure is complicated

Images