CN203129167U - Novel inverted filter device for improving installation quality of suction type barrel-shaped foundation in silt seabed - Google Patents
Novel inverted filter device for improving installation quality of suction type barrel-shaped foundation in silt seabed Download PDFInfo
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- CN203129167U CN203129167U CN 201220579963 CN201220579963U CN203129167U CN 203129167 U CN203129167 U CN 203129167U CN 201220579963 CN201220579963 CN 201220579963 CN 201220579963 U CN201220579963 U CN 201220579963U CN 203129167 U CN203129167 U CN 203129167U
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Abstract
The utility model provides a novel inverted filter device for improving installation quality of a suction type barrel-shaped foundation in a silt seabed. The novel inverted filter device is formed by geotextile on an outer layer and internal inclusions, namely granular materials. The relative positions of the geotextile and the granular materials are fixed. According to the size of the suction type barrel-shaped foundation and the principles of the geotextile and the granular materials, the inverted filter device with the appropriate size is manufactured on shore. The diameter of the inverted filter device which is spread out on the silt seabed is slightly smaller than the inner diameter of the suction type barrel-shaped foundation so as to reduce friction resistance between the barrel wall and the inverted filter device when the foundation is installed and not to influence the functions of the foundation. The novel inverted filter device has the advantages of effectively protecting the seepage stability of soil mass inside the silt seabed, preventing the internal soil mass from being liquefied and losing stability to cause overhigh soil plugging, and improving the final installation quality of the suction type barrel-shaped foundation.
Description
Technical field
The utility model belongs to offshore wind turbine suction type barrel base installing engineering technical field, relates to the installation quality that uses a kind of novel trans filtering layer device to improve suction type barrel base on the silt sea bed.
Background technology
Wind energy on the sea is as a kind of safe, cleaning, stable regenerative resource, appears gradually than the advantage of other energy.The rugged environment because the sea is special, how selecting a kind of safe, effective, economic base form is key efficient, the low cost development wind energy on the sea.The suction type barrel base is the blower foundation form of development abroad a kind of novelty of getting up in recent years, and this foundation structure manufactured materials is generally steel or concrete, because of its top closure, and bottom opening, the bucket of a handstand of outer image and gaining the name.The suction type barrel base has simple installation, economical with materials, can reuse, and resistance to capsizing is strong, to plurality of advantages such as the depth of water and sea bed condition compliance is strong, is the development trend of blower foundation from now on.Denmark once successfully installed one as the suction bucket of blower foundation in 2009 in the Frederikshaven marine site, this basis diameter 12m, the high 6m of skirt.
Compare with other bases, traditional ocean, the marine mounting means of suction type barrel base is more special, for relying on deadweight effect injection sea bed certain depth scope to form the pressure injection stage of sealed environment, make its slow injection to the suction penetration stage of designated depth for extracting the inner seawater of bucket by the draining extract opening that is reserved in barrel top with the negative pressure that forms continuous action then.At present, carry out a large amount of research work with regard to the negative pressure mounting technique of suction type barrel base in soft clay or sand sea bed in the world, mainly concentrated on on-the-spot original position or indoor model test and numerical analysis stage.It is inner in the negative pressure installation process that to allow to apply vacuum magnitude always be the focuses of two big concerns with soil plug stability.The actual negative pressure that applies should be between staving is sunk between required minimum essential requirement negative pressure and the maximum permission negative pressure.In the suction type foundation installation process, it is generally acknowledged by what insert the soil body of replace under the bucket wall to flow into inside even possible whole inflow 50% or more.From a large amount of engineering practical experience and results of study, think after negative pressure surpasses maximum permission negative pressure, the backward bearer power destruction of the interior soil body of bucket on the clay sea bed or the liquefaction unstability of sand foundation can take place, produce excessive soil plug, have a strong impact on the final installation quality on basis.The basis is heavy, and to pass through resistance suffered in the process also be a problem that merits attention, prevailing paradigm is all thought now: for the big chiltern sea bed of permeability, internal negative pressure causes the seepage flow around the staving, seepage flow causes barrel outer wall frictional resistance to increase, and inwall frictional resistance and end resistance all reduce, and total influence is to sink will reduce when passing through resistance than no seepage flow.
China southeastern coastal areas are the major fields of following wind energy development in offshore 10 kilometer range, these marine sites silt that extensively distributing.Than cohesive soil and sand, silt is a kind of soil of specific type.Its permeability is between sandy soil and cohesive soil, and other mechanics index of physics of silt and its particle constituent have substantial connection.But all be blank at home or even in the world about the mounting technique research of suction type barrel base in the silt sea bed at present.Therefore, it is imperative to carry out the mounting technique research in the silt sea bed of suction type barrel base.Existing a small amount of result of study shows: when the suction type barrel base is installed in the silt sea bed; under inner continuous negative pressure effect; around staving, can form the seepage field of ecto-entad; the inner soil body is under the seepage force effect that makes progress; soil plug compactness can diminish on the one hand; and forming certain seepage channel, its particle of the diffusing soil body that fluffs on the other hand can corrode under the seepage water effect.In the suction penetration later stage, can stop the further heavy desired depth of passing through of suction type barrel base owing to the liquefaction of soil mass unstability that is transported to by seepage water in barrel continuous accumulation of interior space soil particle and the top layer certain depth scope forms too high soil plug.See for details document＜
Tran, M.N., Randolph, M.F., 2007. Installation of suction caissons in sand with silt layers. Journal of Geotechnical and Geoenvironmental Engineering 133 (10), 1183-1191.And document＜
Yang, S.L., Grande, L.O., Qi, J.F., et al., 2003. Excessive Soil Plug and Anti-failure Mechanism of Bucket Foundation During Penetration by Suction. In:Proceedings of the 13th International Offshore and Polar Engineering Conference. Hawaii. p. 659-664..Although under the effect of suction bucket internal negative pressure, can form seepage field around the silt sea bed staving, can reduce the heavy resistance that passes through of staving.But by heavy pass through the too high soil plug that the inner soil body of later stage causes because of the seepage flow unstable failure (reporting once in the several suction type foundation actual installation engineering of the European North Sea and the U.S. Gulf of Mexico that the soil plug maximum height of having found can reach 15% height of the final depth of penetration of staving) to the influence of the final installation quality in basis considerably beyond seepage flow reduce to install the favourable one side that resistance brings.Too high inside soil plug often makes the basis not sink and passes through the predetermined degree of depth that washing away around blower fan can accelerate the basis during one's term of military service has a strong impact on safety and the stability of basis and whole superstructure.When running into the continuation injection of soil plug influence basis on the engineering, generally will take out the soil plug earlier and continue to finish heavy passing through again, this will increase the operation on the sea time greatly.Yet because marine special environment, increasing the operation on the sea time is very uneconomic selection.Also do not have very effective installation measure on the engineering at present, can effectively suppress the development of the inside soil plug in the suction type foundation installation process.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of novel trans filtering layer device that is applied to improve in the silt sea bed suction type barrel base installation quality.For this reason, the utility model is by the following technical solutions: it is made up of outer field geotextile and internal package body-granular material, diameter when described device is paved on sea bed is slightly less than the internal diameter of suction bucket, the frictional resistance of bucket wall and loaded filter device when installing to reduce the basis but do not influence its function.
Geotextile is the main material of forming the loaded filter device, can select the non-woven geotextile synthetic materials of often using on the engineering for use.Generally should be according to its main design parameters-effective aperture O when selecting the geotextile model for use
95(the maximum apparent pore diameter of geotextile, expression have 95% aperture to compare O
95Be worth little) size and form situation and determine with reference to the particle of place, engineering place silt.Generally should guarantee its powder group greater than engineering place sea bed silt (such as, the particle diameter of this particle diameter group is 0.005mm-0.075mm) maximum particle diameter less than effective aperture O
95, guarantee that under the internal negative pressure effect glutinous grain (particle diameter is less than 0.005mm) and most of powder in the silt of top layer can enter the loaded filter device smoothly with seepage water, and it caused to a certain degree silting.
Granular material generally can consider to use the gravel of suitable particle size and grating for forming anti-another indispensable material of filter device when practical application.In actual engineering, determine the installation speed of suction type barrel base and the vacuum magnitude that maximum possible applies according to sitework geological conditions, operation on the sea time and erection equipment-submersible pump watt level usually.Since granular material another mainly to act on be the sole mass that increases the loaded filter device, prevent that loaded filter breaks away from its origin-location and loses its due function under the effect of suction bucket internal negative pressure.So should determine according to the peak suction size that actual capabilities apply when selecting granular material model and definite loaded filter device actual (real) thickness for use.
In order to reduce marine total activity duration, can be according to suction type barrel base size and the principle described above sizeable loaded filter device of manufactured size by land.
For making things convenient for operation on the sea, should fix its relative position between geotextile and the granular material.
Owing to adopt the technical solution of the utility model, effectively protected the analysis of seepage flow stability of the inner soil body of silt sea bed, suppress inner liquefaction of soil mass unstability and cause too high soil plug, and improved the final installation quality of suction type foundation.
Description of drawings
Fig. 1 is the schematic diagram that the auxiliary suction type barrel base negative pressure of loaded filter device of the present utility model is installed.
Fig. 2 is the structural representation of the utility model device.
The specific embodiment
With reference to Fig. 2, the novel trans filtering layer device 100 that is applied to improve in the silt sea bed suction type barrel base installation quality that the utility model provides, it is made up of outer field geotextile cover 1 and the granular material 2 that is in the geotextile cover, and the diameter when described device is paved on sea bed is slightly less than the internal diameter of suction type barrel base.
The effective aperture O of geotextile
95Maximum particle diameter greater than place, engineering place silt.
Described granular material 2 adopts gravel.
With reference to Fig. 1, the suction type barrel base negative pressure mounting method that be applied to silt sea bed auxiliary by loaded filter device of the present utility model can carry out according to the following steps: at first, in order to reduce marine total activity duration, can be according to the size of suction type barrel base 200 and the structure described above sizeable loaded filter device 100 of manufactured size by land, the frictional resistance of bucket wall and loaded filter device when installing for reducing the basis but do not influence its function, the loaded filter assembly dia can be slightly less than the internal diameter of barrel base, for making things convenient for operation on the sea, should fix its relative position between geotextile and the granular material; Then, by towboat the loaded filter device of making is dragged to marine site, foundation construction place, suitable processing is done on silt sea bed surface to suction type foundation position to be installed, the topsoil (it is suitable with loaded filter device gross thickness to remove soil thickness) in the certain thickness is also removed in smooth place, institute's sea-bed area area of handling and suction type barrel base energy overlay area 300 areas suitable; Then, slowly sink to suction type foundation zone to be installed with making good loaded filter device 100 by offshore crane or pontoon, by water operation under diver or the underwater robot, the loaded filter device evenly is laid on treated silt sea bed surface, and guarantee that loaded filter device top and sea bed face on every side are in sustained height substantially, prevent the artificial heavy obstruction that passes through in influence basis of making; At last, finish the conventional installation procedure of suction type barrel base on this specific sea bed surface, rely on namely that the pressure of self buoyant weight amount is heavy to be passed through the stage and extract the heavy phase process of passing through of suction that inner bucket water forms negative pressure.
In actual engineering, determine the installation speed of suction type barrel base and the vacuum magnitude that maximum possible applies according to sitework geological conditions, operation on the sea time and erection equipment-submersible pump watt level usually.Since granular material another mainly to act on be the sole mass that increases the loaded filter device, prevent that loaded filter breaks away from its origin-location and loses its due function under the effect of suction bucket internal negative pressure.So should determine according to the peak suction size that actual capabilities apply when selecting granular material model and definite loaded filter device actual (real) thickness for use.
Below in conjunction with the accompanying drawing 1 concise and to the point real work mechanism of setting forth this utility model technology.
After silt sea bed surface arranges one deck loaded filter device, under the caused seepage effect of suction bucket (suction type barrel base 200) internal negative pressure, the sea bed surface enters loaded filter device 100 near loaded filter device 100 and the thinner regolith seepage water carrying of particle, this situation develops to the direction away from loaded filter, forms the certain thickness Stilt layer 301(that is formed by thick soil particle gradually and sees accompanying drawing 1).This layer soil particle is thicker, and transmission coefficient is big, but it can not stop the movement of fine soil grain.When the loaded filter filtration is given full play to, can form the natural filtering layer 302 of one deck in the Stilt layer upstream, this layer fine earth particle is than Stilt layer more than 301, and water permeability is relatively low, thereby stopped the movement of the fine grained soils of adjacent natural soil layer, increased the analysis of seepage flow stability of undisturbed soil greatly.Therefore, the effect of loaded filter device may be summarized to be to bring out and has formed natural filtering layer.
At suction penetration in earlier stage, because few by the fine earth particle of silting in the loaded filter device 100, it is less to the foundation negative pressure installation influence.At this time under the internal negative pressure effect and the seepage field that forms has reduced the basic heavy resistance that passes through to a certain extent.In negative pressure be installed the later stage, after the continuous silting of fine earth particle in loaded filter device 100, its permeability can constantly reduce, under the constant situation of inside and outside head difference, most head loss have been born in the loaded filter device 100 that transmission coefficient reduces, the soil body and the head loss of extraneous part are lowered greatly, effectively regulated the amount of seepage water.At this time be similar to an impervious layer in the loaded filter device 100 of silting, effectively blocked the transmission of internal negative pressure toward soil body deep, guaranteed inner soil body self stability.From top introduction as can be seen, apply the loaded filter device technique after, heavy to pass through the influence at initial stage be very little to suction type foundation.At this time can give full play to because internal negative pressure causes the seepage flow around the staving and reduce this favourable one side of installation resistance.Later stage is installed, might not reduces although resistance is installed, under submersible pump power appropriate condition, still the basis can be in place smoothly.Be the analysis of seepage flow stability of effectively having protected the inner soil body and apply behind the loaded filter device remarkable advantages this moment, suppress inner liquefaction of soil mass unstability to cause too high soil plug, and improved the final installation quality of suction type foundation.
Along with the utilization of continually developing of coastal waters wind energy resources, the exploitation of offshore wind farm will be moved towards the field, deep-sea gradually.When the depth of water surpasses 50m, fixed braced structures will seem uneconomical as blower foundation, and the buoyant foundation is the alternative best base form of following deep-sea blower fan structure.Similar with suction type barrel base mounting method, the bigger suction anchor of draw ratio (the high and basic diameter ratio of skirt) is the anchoring base form of current deep-sea floating oil production platform and following floating blower fan optimum.Therefore, this utility model technology can also be applied to the installation process of suction anchor basis on silt or sand soil sea bed, is used for improving the installation quality of suction type foundation.
Claims (3)
1. novel trans filtering layer device that is applied in the silt sea bed to improve suction type barrel base installation quality, it is characterized in that it by outer field geotextile cover and be in the interior granular material of geotextile cover being formed, the diameter when described device is paved on sea bed is slightly less than the internal diameter of suction type barrel base.
2. a kind of novel trans filtering layer device that is applied in the silt sea bed to improve suction type barrel base installation quality as claimed in claim 1 is characterized in that the effective aperture O of geotextile
95Maximum particle diameter greater than place, engineering place silt.
3. a kind of novel trans filtering layer device that is applied to improve in the silt sea bed suction type barrel base installation quality as claimed in claim 1 is characterized in that described granular material adopts gravel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579963 CN203129167U (en) | 2012-11-06 | 2012-11-06 | Novel inverted filter device for improving installation quality of suction type barrel-shaped foundation in silt seabed |
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| CN 201220579963 CN203129167U (en) | 2012-11-06 | 2012-11-06 | Novel inverted filter device for improving installation quality of suction type barrel-shaped foundation in silt seabed |
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| CN 201220579963 Expired - Fee Related CN203129167U (en) | 2012-11-06 | 2012-11-06 | Novel inverted filter device for improving installation quality of suction type barrel-shaped foundation in silt seabed |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900097A (en) * | 2012-11-06 | 2013-01-30 | 浙江大学 | Reverse filtering layer device for assisting in mounting suction barrel-shaped foundation applied to silt seabed and method for mounting barrel-shaped foundation |
| CN111456687A (en) * | 2020-04-08 | 2020-07-28 | 中国石油大学(华东) | Multi-cylinder coordination self-balancing wellhead supporting device suitable for marine hydrate exploitation |
-
2012
- 2012-11-06 CN CN 201220579963 patent/CN203129167U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900097A (en) * | 2012-11-06 | 2013-01-30 | 浙江大学 | Reverse filtering layer device for assisting in mounting suction barrel-shaped foundation applied to silt seabed and method for mounting barrel-shaped foundation |
| CN102900097B (en) * | 2012-11-06 | 2015-04-29 | 浙江大学 | Reverse filtering layer device for assisting in mounting suction barrel-shaped foundation applied to silt seabed and method for mounting barrel-shaped foundation |
| CN111456687A (en) * | 2020-04-08 | 2020-07-28 | 中国石油大学(华东) | Multi-cylinder coordination self-balancing wellhead supporting device suitable for marine hydrate exploitation |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20151106 |
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| EXPY | Termination of patent right or utility model |