EP2851471B1 - Bauwerksstruktur insbesondere Unterwasserstruktur eines Offshore-Bauwerks und Verfahren zur Gründung eines Offshore-Bauwerks - Google Patents

Bauwerksstruktur insbesondere Unterwasserstruktur eines Offshore-Bauwerks und Verfahren zur Gründung eines Offshore-Bauwerks Download PDF

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Publication number
EP2851471B1
EP2851471B1 EP14185475.2A EP14185475A EP2851471B1 EP 2851471 B1 EP2851471 B1 EP 2851471B1 EP 14185475 A EP14185475 A EP 14185475A EP 2851471 B1 EP2851471 B1 EP 2851471B1
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EP
European Patent Office
Prior art keywords
concrete
building structure
structure according
equivalent
pile
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Application number
EP14185475.2A
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German (de)
English (en)
French (fr)
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EP2851471A3 (de
EP2851471A2 (de
Inventor
Daniel Bartminn
Jesus David Quintana Saavedra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innogy SE
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RWE Innogy GmbH
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Publication of EP2851471A3 publication Critical patent/EP2851471A3/de
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0008—Methods for grouting offshore structures; apparatus therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/52—Submerged foundations, i.e. submerged in open water

Definitions

  • the invention relates to a building structure, in particular an underwater structure of an offshore structure, comprising at least two interconnected or at least partially enclosing structural elements of steel, which at least partially enclose at least a volume filled with a hardenable potting compound.
  • the invention further relates to a method for establishing an offshore structure, comprising an underwater structure having at least one support leg and / or at least one pile guide on the underwater structure, the method comprising creating at least one foundation pile in the seabed and connecting the underwater structure to the foundation pile and the Graying the support leg in the foundation pile or vergrouten an annulus between the pile guide and the foundation pile comprises.
  • An underwater structure of an offshore structure and a method of the type mentioned are, for example, from WO 2011/010937 A1 and the EP 0 204 041 A1 known.
  • Offshore foundations are often designed as pile foundations, with one or more foundation piles usually being rammed or flushed into the seabed.
  • the piles are often formed as hollow piles made of steel, which are spent over a given length in the seabed.
  • an underwater structure or anchoring structure of the offshore structure for example in the form of a jacket foundation, placed.
  • the jacket foundation will later accommodate a transition piece and a structure built on the transition piece.
  • the support legs of the structure may for example be provided with so-called piles sleeves, which are interspersed in the installation position of the foundation piles. Alternatively, the support legs can be immersed in the foundation piles.
  • offshore structures are exposed to cyclic loads by waves and wind, so that tensile and compressive stresses are entered into the potting compound over the life of the structure.
  • the concrete undergoes some shrinkage, which may reduce the surface contact of the concrete with the steel, so that tensile stresses in the concrete lead to cracking and reduced material strength of the concrete.
  • the invention is therefore based on the object to provide a building structure and a method of the type mentioned, in which the fatigue strength of the molded compounds is improved, especially when exposed to dynamic cyclic loads.
  • the object is first achieved by a building structure according to Ansprunch 1.
  • this volume increase takes place over a long period of time and to such an extent that it is ensured that the strength limits of the building structure are not exceeded.
  • a building structure in the sense of the present invention does not necessarily have to be an underwater structure. Even potted compounds that are not underwater are subject to structural changes, for example in the form of drying shrinkage. Even with such building structures, it is useful and appropriate to fill the enclosed volumes with a hydraulically setting mass that undergoes an increase in volume after curing.
  • the building structure according to the invention comprises both partially enclosing structural components with, for example, annular space volumes as well as those components which are connected, for example, the impact side with bolted flange connections to each other.
  • a concrete is provided as potting compound, which comprises an alkali silicate-reactive aggregate.
  • an alkali-silica reaction is generated in the concrete between the alkalis of the cement in the concrete and the concrete aggregates with alkali-soluble silica. This reaction causes a drifting or an increase in the volume of the concrete, which makes use of the structure according to the invention in order to generate a prestress between the enclosing components of the building structure.
  • the concrete has an alkali content of between 1 kg / m 3 and 5 kg / m 3 of Na 2 O equivalent.
  • the concrete has an alkali content> 1 kg / m 3 , more preferably> 3 kg / m 3 . A value of 5 kg / m 3 should not be exceeded.
  • Na 2 O equivalent Alkaline contents of cement and concrete are usually given as so-called Na 2 O equivalent.
  • the Na 2 O equivalent results from the sum of the Na 2 O content and the K 2 O content occupied by a factor.
  • Concrete usually consists of the cement, if necessary, a concrete additive, which is considered volumetrically, and a surcharge and a water supply.
  • the cement is hydraulically reactive and, with the addition of water, causes the hydraulic setting of the mixture.
  • the cement has a Na 2 O equivalent of> 0.6 M .-%.
  • alkali-sensitive additives for example aggregates, lead in combination with cements with a Na 2 O equivalent of> 0.6 M .-% to the desired volume increase of the concrete.
  • the aggregate is preferably selected from a group comprising siltstone, limestone, quartzite, greywacke, granite, diorite, gabbro, rhyolitic tuff, chlorite schist or basalt.
  • the aggregate may comprise greater than 1% by weight of pure crystalline or amorphous silicate minerals, preferably selected from a group comprising opal, cristobalite, obsidian or other volcanic or synthetic glass.
  • volcanic glass means an amorphous vulcalite with a high silicate content.
  • the volume increase when using moderately alkali-reactive supplements, may be in the range of 0.06% or slightly more than 0.06%.
  • the volume increase may be on the order of 0.12%.
  • the volume increase after one year may be more than 0.24%.
  • the addition of water to the pourable concrete is preferably chosen so that the relative internal moisture of the concrete is about 80% after two years.
  • the proportion of the concrete additive should be ⁇ 30% by mass.
  • the M .-% - proportion of the concrete additive should be ⁇ 35%.
  • the proportion of the concrete admixture should be ⁇ 60% by mass, when using silicate dust ⁇ 12% by mass, when using slag ⁇ 65%. % and when using metakaolin ⁇ 20% by mass.
  • the proportion of CaO in the fly ash should ideally be above 15% by mass.
  • building structure in a preferred variant of the building structure according to the invention are provided as structural elements at least one foundation pile in the seabed and at least one support leg or at least one pile guide to a foundation structure of the offshore structure and the potting compound fills an annular space between the support leg or the pile guide on the one hand and the pile on the other.
  • the object underlying the invention is further achieved by a method for establishing an offshore structure comprising an underwater structure with at least one support leg or at least one pile guide on the underwater structure, the method comprising creating at least one foundation pile in the seabed and connecting the underwater structure the foundation pile and the Vergrouten of the support leg in the foundation pile or the Vergrouten an annulus between the pile guide and the foundation pile comprises, and wherein as a potting compound, a hydraulically setting mass is used, which undergoes an increase in volume after setting.
  • FIGS. 1 and 2 show part of an underwater anchoring structure of an offshore structure.
  • the anchoring structure comprises a support leg 1, which is inserted into a foundation pile 2 anchored in the seabed.
  • the anchoring structure is designed for example as a so-called jacket foundation with a plurality of support legs 1, which receives a transition piece (transition piece) and a building erected thereon, for example in the form of a tower with a wind power generator.
  • the support leg 1 is part of the steel construction of the jacket foundation and dives over a predetermined embedding length in the foundation pile 2 a.
  • the foundation pile 2 for example, designed as a steel tube, this was rammed or flushed into the seabed.
  • the support leg 1 may be discontinued, for example, on a filling within the foundation pile 2. Alternatively, this can be supported for example on a so-called bracket on the foundation pile 2.
  • the annular space 3 formed between the foundation pile 2 and the support leg 1 passing through it is routed in a known manner, that is to say filled with a hardenable potting compound 4.
  • the arrangement of the support leg 1 in the foundation pile 2 is representative of at least two mutually partially enclosing or partially penetrating components made of steel, which form an outer enclosure and an inner enclosure.
  • the foundation pile 2 defines the outer enclosure
  • the support leg 1 however, the inner enclosure, the annular space formed between them 3 forms the volume to be filled.
  • potting compound 4 a determination of the inner enclosure is effected with respect to the outer enclosure, the potting compound 4 transmits forces in the cured state between the support leg 1 and the foundation pile.
  • the potting compound 4 within the annulus may additionally be interspersed with reinforcing elements.
  • 2 shear plugs 5 are provided on the inside of the foundation pile, which are embedded in the potting compound 4.
  • the shear plugs 5 can also be provided on the support leg 1.
  • Scherdübeln 5 also recesses / openings in the support leg 1 and / or on the foundation pile 2 may be provided, in which the potting compound 4 flows into and thus produces a positive connection.
  • a concrete is provided as potting compound, which was prepared with an alkali-silicate reactive addition and the cement has a Na 2 O equivalent of more than 0.6 M .-%.
  • a aggregate with a maximum grain size of 8 mm or a maximum grain size of 16 mm was selected as the aggregate for the concrete.
  • the rock types include, for example, granite, diorite, grave, basalt, quartzite, greywacke or dense limestones, so that the alkali content of the concrete, So the finished mixture of cement and aggregate has an alkali content of more than 1 kg / m 3 Na 2 O equivalent.
  • the alkali content of the concrete is more than 3 kg / m 3 Na 2 O equivalent.
  • Such an alkali content is achieved, for example, if silicate-containing limestones are used as aggregate.
  • the alkali content of the concrete may be more than 4 kg / m 3 Na 2 O equivalent.
  • FIG. 3 and 4 are the frontier lines for aggregates of a maximum particle size of 8 mm ( FIG. 3 ) and a maximum particle size of 16 mm ( FIG. 4 ), using aggregates with the A8 or B8 grading curves when using an aggregate with a maximum grain size of 8 mm, aggregates with the grading curves A16 or B16 are used for a maximum aggregate grain size of 16 mm.
  • the grading curves are determined using mesh sieves and square-hole sieves in accordance with DIN ISO 3310-1 and DIN ISO 3310-2, with square hole sieves being used above a particle size of 2.5 mm.
  • such aggregates are preferred, which have a greater modulus of elasticity and a lower water absorption capacity.
  • These are preferably granites, diorite grabbo, basalt, quartzite, and higher density limestone.
  • the preferred concrete mixture in the presence of water favors an alkali-silica reaction which leads to the sedimentation of the concrete after its hardening, that is after completion of the hydraulic setting process.
  • composition of the concrete is chosen so that the volume increase after one year is at least 0.06%.
  • the volume increase is preferably determined on a concrete block according to the test standard according to ASTM C1293.
  • the volume increase for moderately reactive concrete mixes is about 0.06%, for high reactive concrete mixes the volume increase may be about 0.12%, for extremely reactive concrete mixes the volume increase may be about 0.24% or more.
  • Alkali-silica reactivity of the mixture is understood to mean the alkali-silica reactivity of the mixture.
  • Alkali-silicic acid reaction is the chemical reaction between the alkalis in the cement and the concrete aggregates with alkali-soluble silicic acid. This alkali-silica reaction is also referred to as an alkali-aggregate reaction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Revetment (AREA)
  • Foundations (AREA)
EP14185475.2A 2013-09-24 2014-09-19 Bauwerksstruktur insbesondere Unterwasserstruktur eines Offshore-Bauwerks und Verfahren zur Gründung eines Offshore-Bauwerks Active EP2851471B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310015819 DE102013015819A1 (de) 2013-09-24 2013-09-24 Bauwerksstruktur insbesondere Unterwasserstruktur eines Offshore-Bauwerks und Verfahren zur Gründung eines Offshore-Bauwerks

Publications (3)

Publication Number Publication Date
EP2851471A2 EP2851471A2 (de) 2015-03-25
EP2851471A3 EP2851471A3 (de) 2015-04-08
EP2851471B1 true EP2851471B1 (de) 2016-06-08

Family

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EP14185475.2A Active EP2851471B1 (de) 2013-09-24 2014-09-19 Bauwerksstruktur insbesondere Unterwasserstruktur eines Offshore-Bauwerks und Verfahren zur Gründung eines Offshore-Bauwerks

Country Status (5)

Country Link
EP (1) EP2851471B1 (es)
DE (1) DE102013015819A1 (es)
ES (1) ES2588481T3 (es)
PL (1) PL2851471T3 (es)
PT (1) PT2851471T (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100027479A1 (it) 2021-10-26 2023-04-26 Bartminn Int Holding Gmbh Tubo composito per applicazioni offshore, metodo per la sua fabbricazione e componente in calcestruzzo multistrato

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109601220B (zh) * 2018-12-17 2021-01-26 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） 一种干旱少雨地区石英岩高陡坡面绿化方法
DE102021112877A1 (de) 2021-05-18 2022-11-24 Rwe Renewables Gmbh Gründungspfahl und Verfahren zu seiner Herstellung
IT202100027473A1 (it) * 2021-10-26 2023-04-26 Bartminn Int Holding Gmbh Componente in calcestruzzo multistrato

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2122710C3 (de) * 1970-05-12 1981-04-02 Sika AG, vorm. Kaspar Winkler & Co., Zürich Zusatzmittel zu Zement, Mörtel und Beton und Verfahren zu dessen Herstellung
US3878687A (en) * 1973-07-19 1975-04-22 Western Co Of North America Grouting of offshore structures
US4552486A (en) * 1984-03-21 1985-11-12 Halliburton Company Grouting method - chemical method
DE10330963A1 (de) * 2003-07-08 2005-01-27 Repower Systems Ag Gründung für Bauwerke
NO339381B1 (no) 2009-07-22 2016-12-05 Owec Tower As Fremgangsmåte og anordning for å kontrollere kraftoverføring mellom en struktur og dens fundament under installasjon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100027479A1 (it) 2021-10-26 2023-04-26 Bartminn Int Holding Gmbh Tubo composito per applicazioni offshore, metodo per la sua fabbricazione e componente in calcestruzzo multistrato

Also Published As

Publication number Publication date
PL2851471T3 (pl) 2016-12-30
ES2588481T3 (es) 2016-11-03
PT2851471T (pt) 2016-09-01
EP2851471A3 (de) 2015-04-08
EP2851471A2 (de) 2015-03-25
DE102013015819A1 (de) 2015-03-26

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