CN201581410U

CN201581410U - Seafloor skirt-type suction anchor

Info

Publication number: CN201581410U
Application number: CN2009202399148U
Authority: CN
Inventors: 李大勇; 都浩; 孙宗军; 刘小丽; 王梅; 曹立雪; 宋言江
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2009-10-14
Filing date: 2009-10-14
Publication date: 2010-09-15
Anticipated expiration: 2019-10-14

Abstract

The utility model discloses a seafloor skirt-type suction anchor which comprises a barrel body with an open bottom part and a closed top end, wherein a drain hole is formed on the top surface of the barrel body; an annular reinforcing disc is arranged on the outer side of the upper end of the barrel body; the annular reinforcing disc and the barrel body form an integrated structure with a T-shaped vertical section; a skirt hemline is connected to the periphery of the annular reinforcing disc; a circle of permeable round holes are uniformly distributed on the top surface of the annular reinforcing disc; the proportion of the diameter of the barrel body to the height of the barrel body is 1: (1-2); the difference between the inner and the outer radius of the annular reinforcing disc is smaller than the radius of the barrel body, the height of the annular reinforcing disc is smaller than that of the barrel body; the proportion of the difference between the inner and the outer radius of the annular reinforcing disc to the thickness of the annular reinforcing disc is 1: (1-2); and the thickness of the skirt hemline ranges from 8 to 10 mm. By improving the traditional suction base, the seafloor skirt-type suction anchor completely solves the problems of high construction cost and small horizontal bearing capacity of the traditional suction base and erosion of seabed soil body at the periphery of the upper part of the barrel body.

Description

Undersea skirt-type suction anchor

Technical field

The utility model belongs to marine engineering design, technical field of construction, relates in particular to the foundation of offshore wind electrical engineering.

Background technology

Along with global energy crisis is day by day obvious, world's more and more national is paid attention to the exploitation regenerative resource.Because the marine wind energy aboundresources, have zero pollution, zero-emission and do not have vision, noise and do not take land energy advantage, have huge resource potential so set up wind power plant at sea.

Present international offshore wind-powered electricity generation maximum water depth is 30m, and major part is built 5～15m depth of water marine site in.And be the important component part of whole engineering as the basis of offshore wind electrical engineering, traditional base form is gravity type foundation, pile foundation and suction basis.The technology relevant with the utility model is the suction basis.The suction basis according to its draw ratio difference, is categorized as suction caisson, suction anchor, suction pile or suction barrel base (suction caisson, suction anchor, suction pile, bucket foundation) both at home and abroad.Similar one inverted " bucket " of the common ground of suction foundation structure, the steel drum structure of bottom-open, top seal just, the staving end face is provided with drain hole.Motivation level load, vertical load and moment of flexure are being born in these suction bases, and heavy to pass through mechanism be identical, promptly make by deadweight to apply negative pressure between barrel inwall and the sea bed and sink to sea bed, can pass through sand and cohesive soil and reach the seabed basement rock.The defective that above-mentioned traditional suction basis exists is:

1) there is the sand liquefaction problem around the tradition basis, thereby reduces foundation bearing capacity;

2) around the basis wave taking place causes sea bed erosion problem easily;

3) can not effectively improve vertical and Its ultimate bearing capacity.

In order to overcome the defective on traditional suction basis, Chinese patent publication number CN101158164 discloses a kind of " suction type foundation that the seabed is used ", it is to have the annular stable disk of booster action together in the outside, tubbiness body upper end of traditional suction type foundation, the holistic T shape structure of the common formation of annular stable disk and tubbiness body, the outer rim radius of described annular stable disk and staving body are positioned at the equal in length of annular stable disk below part.Bear horizontal dynamic loading ability and vertical bearing capacity though this suction type foundation has improved to a certain extent, also have following defective:

1) because the existence of annular stable disk is not provided with permeable hole above reaching, the basis can produce the seawater resistance that makes progress more greatly when sunk type, especially under the condition of " the outer rim radius of annular stable disk and staving body are positioned at the equal in length of annular stable disk below part " of describing as this patent, stable disk has large-size, bigger cascading water resistance will be produced, heavy speed and the heavy quality of passing through of passing through of influence; Increased energy loss simultaneously,, can increase construction cost with traditional suction basis ratio;

2) though the bearing capacity of the vertical pressurized on basis can be effectively improved on this basis, can not significantly improve especially anti-pulling capacity of horizontal bearing capacity;

3) this basis is owing to be provided with bigger annular stable disk, and it is a cantilever construction, under bigger top vertical uniform load q, can produce warpage upwards, the contact area of reduction and sea bed, thus reduce its bearing capacity.If adopt the scheme that adds steel plate to prevent that this phenomenon from producing, and certainly will cause the remarkable increase of cost of manufacture.

4) can not effectively solve staving top seabed soil erosion problem on every side.

The applicant finds that by the analysis to suction base response under the horizontal loads maximal bending moment and shearing that the suction basis is subjected to occur in the shallow soil layer, and the interaction on shallow soil and suction basis has determined suction foundation level bearing capacity and maximum defluxion distortion.Want to improve the horizontal bearing capacity on suction basis, reduce deflection deformation, must improve the interaction of traditional suction basis and shallow soil.The utility model proposes a kind of novel suction basis---skirt-type suction anchor for this reason.By document Investigation, skirt-type suction anchor is a kind of new structure, the report that still unmatchful both at home and abroad this theory, experimental study and engineering used.

Summary of the invention

The purpose of this utility model provides the undersea skirt-type suction anchor that a kind of bending rigidity and shearing rigidity height, anti-crawl agentdefiection degree are out of shape, significantly improve vertical bearing capacity, horizontal bearing capacity and application life.

For achieving the above object, skirt-type suction anchor structure of the present utility model is: it comprises a bottom-open, the staving of top closure, the staving end face is provided with drain hole, the outside, staving upper end has an annular stopping-off piece, the common formation of annular stopping-off piece and staving one longitudinal section is the overall structure of T shape, it is characterized in that, be connected with the shirt rim in the processing of described annular stopping-off piece periphery, evenly be furnished with the permeable circular hole of a circle at the stopping-off piece end face, the number of permeable circular hole and diameter should guarantee to sink at utmost to reduce the seawater resistance when passing through and significantly do not reduce annular stopping-off piece end face intensity.

Above-mentioned staving diameter and height ratio are 1: (1-2);

Less than the staving height, and the difference of the interior outer radius of annular stopping-off piece and its thickness proportion are 1 to the difference of the interior outer radius of above-mentioned annular stopping-off piece less than staving radius, height: (1-2);

The thickness of above-mentioned shirt rim is 8-10mm.

Job practices when the utility model skirt-type suction anchor uses is:

1) at first skirt-type suction anchor is sunk to the seabed by deadweight, staving incision sea bed, staving top drain hole is opened always in this process;

2) staving top drain hole connects drainage system, discharges the water body in the staving, forms negative pressure in staving, and suction anchor continues to sink under suction function.

Close drain hole when 3) suction anchor sinks to the precalculated position, remove drainage system, whole construction finishes.

The utility model has the advantages that:

1, the utility model greatly reduces basic heavy passing through in the process owing to be provided with permeable circular hole at annular stopping-off piece end face, and the resistance of seawater has reduced construction cost.

2, the utility model is provided with the shirt rim according to the problem of suction anchor deflection deformation under the horizontal loads, has strengthened the bending rigidity and the shearing rigidity of suction anchor, thereby has reduced the deflection deformation under the horizontal loads;

3, the layout of the utility model shirt rim has enlarged the lateral area and the top area of traditional suction anchor, has improved the frictional force of the basic side and the soil body, thereby improves vertical bearing capacity and uplift resistance, and has reduced main barrel base height;

4, the setting of shirt rim has improved the ability of opposing seabed soil erosion greatly, guarantees bearing capacity not because of reduced by the seabed soil erosion, thereby has prolonged the basic life-span.

In order to verify advantage of the present utility model, through testing: under the identical prerequisite of basic materials, the utility model suction anchor is compared with existing suction basis, the result shows discovery:

1) the utility model skirt-type suction cat heavy to pass through in the process required suction littler by about 30% than existing suction basis, pass through the construction period with sinking thereby reduced power consumption, have favorable economic benefit.

2) skirt-type suction anchor is owing to be provided with " skirt ", and the bearing capacity on the existing suction basis of its bearing capacity ratio improves 20% approximately.

3) with existing suction basis ratio, " shirt rim " that the utility model skirt-type suction anchor is provided with greatly reduces wave master's bucket located washing away of sea bed, and the application life on basis is than having basis life-span length 20 years now;

4) the utility model is owing to be provided with permeable circular hole at annular stopping-off piece end face, and reduced main bucket height, thereby greatly reduces the resistance that passes through the process seawater heavy, and construction cost has reduced by 15%.

In a word, the utility model is by improving existing suction type foundation, thoroughly solved existing suction type foundation construction cost height, horizontal bearing capacity is little and staving top around seabed soil erosion problem, though technical scheme is simple, but obtained unforeseeable good effect, concerning the person of ordinary skill in the field, can't expect in advance coming out with reasoning, have outstanding substantive distinguishing features.Meet the creativeness that possesses the 3rd section of the 22nd article regulation of Patent Law.

Description of drawings

Fig. 1 is a structural front view of the present utility model;

Fig. 2 is the upward view of Fig. 1.

Among the figure: 1-staving, 2-shirt rim, the permeable circular hole of 3-, 4-drain hole, 5-annular stopping-off piece.

The specific embodiment

Further specify the technical solution of the utility model below in conjunction with the drawings and specific embodiments.

As depicted in figs. 1 and 2, skirt-type suction anchor of the present utility model is in bottom-open, staving 1 center of top closure is provided with drain hole 4, the outside, staving 1 upper end has an annular stopping-off piece 5, annular stopping-off piece 5 is the overall structure of T shape with staving 1 common formation one longitudinal section, be connected with shirt rim 2 in described annular stopping-off piece 5 periphery processing, evenly be furnished with the permeable circular hole 3 of a circle at annular stopping-off piece 5 end faces, only show four permeable circular holes 3 among the figure, in actual mechanical process, the number of permeable circular hole 3 and diameter should guarantee to sink at utmost to reduce the seawater resistance when passing through and significantly do not reduce annular stopping-off piece end face intensity.

Above-mentioned staving 1 diameter and height ratio are 1: (1-2).

The difference of the interior outer radius of above-mentioned annular stopping-off piece 5 is less than staving 1 radius, and the height of annular stopping-off piece 5 is less than staving 1 height, and the difference of the interior outer radius of annular stopping-off piece 5 and its thickness proportion are 1: (1-2).

Above-mentioned skirt-type suction basis is made by stainless steel, and wherein shirt rim 2 is made by the steel plate of thickness 8-10mm.

Claims

1. undersea skirt-type suction anchor, it comprises the staving of a bottom-open, top closure, the staving end face is provided with drain hole, the outside, staving upper end has an annular stopping-off piece, the common formation of annular stopping-off piece and staving one longitudinal section is the overall structure of T shape, it is characterized in that, be connected with the shirt rim, evenly be furnished with the permeable circular hole of a circle at annular stopping-off piece end face in the processing of described annular stopping-off piece periphery;

Above-mentioned staving diameter and height ratio are 1: (1-2);

The difference of the interior outer radius of above-mentioned annular stopping-off piece is less than the staving radius, and the height of annular stopping-off piece is less than the staving height, and the difference of the interior outer radius of annular stopping-off piece and its thickness proportion are 1: (1-2);

The thickness of above-mentioned shirt rim is 8-10mm.