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US20130183102A1 - Slip formed concrete structure - Google Patents

Slip formed concrete structure Download PDF

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Publication number
US20130183102A1
US20130183102A1 US13/876,957 US201113876957A US2013183102A1 US 20130183102 A1 US20130183102 A1 US 20130183102A1 US 201113876957 A US201113876957 A US 201113876957A US 2013183102 A1 US2013183102 A1 US 2013183102A1
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US
United States
Prior art keywords
slip
panels
concrete structure
concrete
abrasion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/876,957
Inventor
Kjell Tore Fosså
Endre Gudmestad
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.)
Kvaerner Oil and Gas AS
Kvaemer Engr AS
Kvaerner AS
Original Assignee
Kvaemer Engr AS
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Filing date
Publication date
Application filed by Kvaemer Engr AS filed Critical Kvaemer Engr AS
Publication of US20130183102A1 publication Critical patent/US20130183102A1/en
Assigned to KVAERNER ENGINEERING AS reassignment KVAERNER ENGINEERING AS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FOSSÅ, KJELL TORE, GUDMESTAD, ENDRE
Assigned to KVÆRNER CONCRETE SOLUTIONS AS reassignment KVÆRNER CONCRETE SOLUTIONS AS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KVAERNER ENGINEERING AS
Assigned to KVÆRNER STORD AS reassignment KVÆRNER STORD AS MERGER (SEE DOCUMENT FOR DETAILS). Assignors: KVÆRNER CONCRETE SOLUTIONS AS
Assigned to KVAERNER AS reassignment KVAERNER AS CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KVÆRNER STORD AS
Assigned to KVAERNER AS reassignment KVAERNER AS CHANGE OF ADDRESS Assignors: KVAERNER AS
Assigned to KVAERNER AS reassignment KVAERNER AS CHANGE OF ADDRESS Assignors: KVAERNER AS
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/20—Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
    • E04G11/22—Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E02D5/182—Bulkheads or similar walls made solely of concrete in situ using formworks to separate sections

Definitions

  • the present invention relates to concrete structures. More specifically, the invention relates to slip formed concrete structures, particularly structures made of high strength concrete.
  • slip forming is very favorable, particularly from an economical point of view, since the extent of the work is greatly reduced.
  • the surface of a slip formed concrete structure includes irregularities, particularly when high strength, abrasion resistant concrete qualities are used. The result is reduced erosion and abrasion resistance, reduced service life and reduced surface quality, compared to a structure having a smooth surface, all of which has technical and economical consequences. Repair of irregularities or eroded or abraded surface is often very expensive and the quality is still reduced. Forming with fixed forms for all or a part of a concrete structure is often very expensive.
  • the objective of the invention is to provide a concrete structure and a method of building said structure, providing improvements with respect to the above mentioned problems and disadvantages.
  • the invention provides a concrete structure, distinctive in that at least a part of the structure has been formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • the concrete structure is for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, and the abrasion allowance has been formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • the invention also provides a method of building a concrete structure, distinctive in that at least a part of the structure is formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • the method is for building a concrete structure for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, the abrasion allowance is formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • the invention also provides use of panels inside a slip form, the panels facing the slip form, for building a slip formed concrete structure or a part thereof.
  • the structure, method and use of the invention surprisingly result in a slip formed concrete structure or -part having smooth, plane and hard surface without irregularities such as small cracks, crazes or voids, which has been impossible so far in full scale production, particularly when using hard high strength, abrasion resistant air-rich concrete qualities.
  • the present invention eliminates or reduces irregularities, particularly lifting crazes or—cracks, in the surface of the ice abrasion allowance as the slip form is lifted upwards, and that such irregularities previously have been the main reason for reduced service life and high abrasion rate.
  • the technical effect can be beneficial for any concrete structure, particularly for high strength quality concrete structures exposed for erosion or abrasion or wear for any reason, for any structures for which reduced drag or friction can be beneficial, and structures for which subsequent treatment can be facilitated.
  • Deterioration, wear, ageing, ingress of salts and chemicals all take place in principle form the surface and inwards, for which reason the structure, the method and use according to the invention can be advantageous since better resistance is provided. Testing so far has confirmed the beneficial technical effect; however, it may take many years of service and testing in order to quantify the technical effect in all of the different aspects thereof.
  • panel means in this context any in substance two dimensional structure useful for the intended purpose. Examples are plates of any feasible material such as metal, polymer material, composite material, concrete and ceramic material. Panels also include any grid, grating, mesh or honeycomb-like plate-like structures.
  • the panels are preferably having a shape adapted for the site it is used, such as the curvature of a platform shaft with round cross section shape.
  • the panels are arranged on the outer side of the abrasion allowance, or for fixed panels as a part of the abrasion allowance, and for all embodiments of the invention the panels are arranged nearest to the slip form, i.e. facing the slip form.
  • the panels are left in the structure after the slip forming or the panels are removed from the structure after the slip forming.
  • a smooth inner surface is preferred for panels that are removed.
  • An irregular inner surface such as for feasible grid, grating, mesh or honeycomb-like plate-like structures, is preferred for panels that are left as part of the structure.
  • the abrasion allowance is formed by concrete, preferably without steel armour reinforcement except of possible reinforcing fibres that optionally may be steel fibres. Any steel reinforcement armouring of the abrasion allowance is preferably without electrical or mechanical contact with the main steel reinforcement armouring.
  • the length of increased thickness that is the elevation range of the ice abrasion allowance, preferably encompass the range abraded by drifting ice, which is from the lowest ice draught level at lowest water tide level to the highest expected ice top at the highest water tide level for a gravity base structure.
  • the tidal range is replaced by the ballast range for the specification of required elevation range having abrasion allowance.
  • the transition from the ordinary structure to the structure of increased thickness is preferably gradual and preferably formed by an insert form onto which the panels are arranged.
  • both the panels and the insert form have means for being arranged or connected together, such as by a wedge system, bolts or male-female means.
  • FIGS. 1 to 5 illustrate sections through a structure according to the invention having an abrasion allowance.
  • FIG. 1 illustrating a section through a wall of a gravity base shaft structure 1 that is slip formed and which shall be provided with an abrasion allowance according to the invention.
  • a slip form yoke 2 and working platforms 3 are lifted upwards concurrently as the structure is slip formed upwards, in a conventional way.
  • a bolted support 4 and an insert form 5 have been arranged on the outer wall of the structure.
  • the first panel 6 has been arranged on the insert form 5 .
  • the volume inside the panel is filled with concrete of a feasible quality for abrasion resistance and behaviour in the forming operation, which quality may be determined by testing.
  • the armouring is not illustrated.
  • the steel armouring is not extended into the abrasion allowance, but the abrasion allowance may preferably comprise reinforcing fibres such as steel fibres, carbon fibres, boron fibres or other fibres or ceramics or other material for increased abrasion resistance and/or strength.
  • the main structure armouring will thereby not be exposed as the erosion allowance is eroded.
  • FIGS. 4 and 5 illustrate how the structure is slip casted further, arranging panels successively upwards in order to cover the structure with abrasion allowance over the intended distance or elevation range.
  • the figures also illustrate how the abrasion allowance is terminated at the upper end in a corresponding way as it was started in the lower end, i.e with an insert form and a bolted support.
  • the supports, insert forms and panels are preferably provided with means for being connected together, preferably in a releasable way.
  • the panels, any insert forms and any bolted supports are all removed after the forming operation, leaving a smooth, plane, hard and abrasion resistant regular surface of the abrasion allowance on the structure.
  • a concrete quality such as B70 (CEN: C70/85, ref. ISO 19906) is feasible for abrasion allowance.
  • Testing and modelling has revealed that an abrasion allowance thickness of 105-122 mm, over an elevation range of typical 6.6 m encompassing the ice drift abraded zone, for a service life of 40 years on shafts of a gravity base structure in ice infested areas, is convenient.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)

Abstract

The invention provides a concrete structure of which at least a part has been formed by slip forming with panels inside the slip form, the panels facing the slip form.

Description

    FIELD OF THE INVENTION
  • The present invention relates to concrete structures. More specifically, the invention relates to slip formed concrete structures, particularly structures made of high strength concrete.
    • BACKGROUND OF THE INVENTION AND PRIOR ART
  • Currently, many concrete structures, such as concrete shafts, are typically formed by slip forming, alternatively termed slip casting. Compared to forming with fixed forms, slip forming is very favorable, particularly from an economical point of view, since the extent of the work is greatly reduced. However, the surface of a slip formed concrete structure includes irregularities, particularly when high strength, abrasion resistant concrete qualities are used. The result is reduced erosion and abrasion resistance, reduced service life and reduced surface quality, compared to a structure having a smooth surface, all of which has technical and economical consequences. Repair of irregularities or eroded or abraded surface is often very expensive and the quality is still reduced. Forming with fixed forms for all or a part of a concrete structure is often very expensive.
  • Structures used in the sea in areas infested by drifting surface ice have so far not been protected in the zone abraded by ice by a slip formed concrete abrasion allowance, but with a protective steel structure, due to the above mentioned technical problems. For concrete structures such steel protection is very expensive, requiring extensive scaffolding and additional work at high elevation, and may not be a good technical solution since the integrity has been questionable. Protection using concrete has so far not been possible for the desired reliable, long-lasting, affordable and simple solutions sought for by the industry.
  • The objective of the invention is to provide a concrete structure and a method of building said structure, providing improvements with respect to the above mentioned problems and disadvantages.
    • SUMMARY OF THE INVENTION
  • The invention provides a concrete structure, distinctive in that at least a part of the structure has been formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • Preferably the concrete structure is for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, and the abrasion allowance has been formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • The invention also provides a method of building a concrete structure, distinctive in that at least a part of the structure is formed by slip forming with panels inside the slip form, the panels facing the slip form. In one embodiment the method is for building a concrete structure for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, the abrasion allowance is formed by slip forming with panels inside the slip form, the panels facing the slip form.
  • The invention also provides use of panels inside a slip form, the panels facing the slip form, for building a slip formed concrete structure or a part thereof.
  • The structure, method and use of the invention surprisingly result in a slip formed concrete structure or -part having smooth, plane and hard surface without irregularities such as small cracks, crazes or voids, which has been impossible so far in full scale production, particularly when using hard high strength, abrasion resistant air-rich concrete qualities. Without wishing to be bound by theory, it is assumed that the present invention eliminates or reduces irregularities, particularly lifting crazes or—cracks, in the surface of the ice abrasion allowance as the slip form is lifted upwards, and that such irregularities previously have been the main reason for reduced service life and high abrasion rate. The technical effect can be beneficial for any concrete structure, particularly for high strength quality concrete structures exposed for erosion or abrasion or wear for any reason, for any structures for which reduced drag or friction can be beneficial, and structures for which subsequent treatment can be facilitated. Deterioration, wear, ageing, ingress of salts and chemicals all take place in principle form the surface and inwards, for which reason the structure, the method and use according to the invention can be advantageous since better resistance is provided. Testing so far has confirmed the beneficial technical effect; however, it may take many years of service and testing in order to quantify the technical effect in all of the different aspects thereof.
  • The term panel means in this context any in substance two dimensional structure useful for the intended purpose. Examples are plates of any feasible material such as metal, polymer material, composite material, concrete and ceramic material. Panels also include any grid, grating, mesh or honeycomb-like plate-like structures. The panels are preferably having a shape adapted for the site it is used, such as the curvature of a platform shaft with round cross section shape. The panels are arranged on the outer side of the abrasion allowance, or for fixed panels as a part of the abrasion allowance, and for all embodiments of the invention the panels are arranged nearest to the slip form, i.e. facing the slip form.
  • The panels are left in the structure after the slip forming or the panels are removed from the structure after the slip forming. A smooth inner surface is preferred for panels that are removed. An irregular inner surface, such as for feasible grid, grating, mesh or honeycomb-like plate-like structures, is preferred for panels that are left as part of the structure.
  • The abrasion allowance is formed by concrete, preferably without steel armour reinforcement except of possible reinforcing fibres that optionally may be steel fibres. Any steel reinforcement armouring of the abrasion allowance is preferably without electrical or mechanical contact with the main steel reinforcement armouring.
  • The length of increased thickness, that is the elevation range of the ice abrasion allowance, preferably encompass the range abraded by drifting ice, which is from the lowest ice draught level at lowest water tide level to the highest expected ice top at the highest water tide level for a gravity base structure. For a floating concrete structure, the tidal range is replaced by the ballast range for the specification of required elevation range having abrasion allowance.
  • The transition from the ordinary structure to the structure of increased thickness is preferably gradual and preferably formed by an insert form onto which the panels are arranged. Preferably both the panels and the insert form have means for being arranged or connected together, such as by a wedge system, bolts or male-female means.
    • FIGURES
  • The invention is illustrated with figures, of which:
  • FIGS. 1 to 5 illustrate sections through a structure according to the invention having an abrasion allowance.
    •  DETAILED DESCRIPTION
  • Reference is made to FIG. 1, illustrating a section through a wall of a gravity base shaft structure 1 that is slip formed and which shall be provided with an abrasion allowance according to the invention. A slip form yoke 2 and working platforms 3 are lifted upwards concurrently as the structure is slip formed upwards, in a conventional way.
  • In FIG. 2, a bolted support 4 and an insert form 5 have been arranged on the outer wall of the structure. In FIG. 3 the first panel 6 has been arranged on the insert form 5. The volume inside the panel is filled with concrete of a feasible quality for abrasion resistance and behaviour in the forming operation, which quality may be determined by testing. The armouring is not illustrated. Preferably the steel armouring is not extended into the abrasion allowance, but the abrasion allowance may preferably comprise reinforcing fibres such as steel fibres, carbon fibres, boron fibres or other fibres or ceramics or other material for increased abrasion resistance and/or strength. The main structure armouring will thereby not be exposed as the erosion allowance is eroded.
  • FIGS. 4 and 5 illustrate how the structure is slip casted further, arranging panels successively upwards in order to cover the structure with abrasion allowance over the intended distance or elevation range. The figures also illustrate how the abrasion allowance is terminated at the upper end in a corresponding way as it was started in the lower end, i.e with an insert form and a bolted support. The supports, insert forms and panels are preferably provided with means for being connected together, preferably in a releasable way. During slip forming the slip form slip or slide on the panels, not on the concrete of the abrasion allowance. Accordingly, the concrete of the abrasion allowance is not subjected to shear forces by the slip form.
  • Preferably the panels, any insert forms and any bolted supports are all removed after the forming operation, leaving a smooth, plane, hard and abrasion resistant regular surface of the abrasion allowance on the structure. Extensive testing has revealed that a concrete quality such as B70 (CEN: C70/85, ref. ISO 19906) is feasible for abrasion allowance. Testing and modelling has revealed that an abrasion allowance thickness of 105-122 mm, over an elevation range of typical 6.6 m encompassing the ice drift abraded zone, for a service life of 40 years on shafts of a gravity base structure in ice infested areas, is convenient.
  • Testing has revealed that the contents of small cracks or crevices on a concrete surface is dramatically reduced, and the surface become far smoother, with far less irregularities, by slip forming with panels with smooth panel inner surface and removing said panels after forming, according to a preferred embodiment of the invention. The result is inter alia an improved ice abrasion resistance, a reduction in ice formation on the structure per se, increased resistance to repeated cycles of freezing and melting, reduced friction and prolonged service life of the structure.

Claims (12)

1. A concrete structure, wherein at least a part of the structure has been formed by slip forming with panels inside the slip form, the panels facing the slip form and that the panels are removable panels that are removed from the structure after slip forming.
2. The concrete structure according to claim 1, wherein the structure is for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, the abrasion allowance has been formed by slip forming with panels inside the slip form, the panels facing the slip form.
3. The concrete structure according to claim 2, wherein the abrasion allowance of the structure is without steel reinforcement armouring.
4. (canceled)
5. The concrete structure according to claim 2, wherein the structure is the shafts of a gravity base structure or a floating concrete structure.
6. The concrete structure according to claim 2, wherein the abrasion allowance is without steel reinforcement armouring having electrical or mechanical contact with the main steel reinforcement armouring
7. A method of building a concrete structure, wherein at least a part of the structure is formed by slip forming with panels inside the slip form, the panels facing the slip form and that the panels are removed from the structure after the slip forming.
8. The method according to claim 7, for building a concrete structure for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, wherein the abrasion allowance is formed by slip forming with panels inside the slip form, the panels facing the slip form.
9. (canceled)
10. The method according to claim 8, wherein the abrasion allowance is formed by concrete, without steel armour reinforcement except of possible fibres that optionally may be steel fibres.
11. Use of panels inside a slip form, the panels facing the slip form, for building a slip formed concrete structure or a part thereof.
12. Use according to claim 11, wherein the concrete structure is for use offshore in ice-infested areas, the structure has an increased thickness as an abrasion allowance in a zone abraded by ice drifting on the sea, the panels are used for building the abrasion allowance by slip forming with panels inside the slip form.
US13/876,957 2010-10-01 2011-09-23 Slip formed concrete structure Abandoned US20130183102A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20101368 2010-10-01
NO20101368A NO335062B1 (en) 2010-10-01 2010-10-01 Sliding cast concrete structure, as well as the method and application of such a concrete structure.
PCT/NO2011/000270 WO2012044174A1 (en) 2010-10-01 2011-09-23 Slip formed concrete structure

Publications (1)

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US20130183102A1 true US20130183102A1 (en) 2013-07-18

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US13/876,957 Abandoned US20130183102A1 (en) 2010-10-01 2011-09-23 Slip formed concrete structure

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US (1) US20130183102A1 (en)
EP (1) EP2622151B1 (en)
CA (1) CA2813195C (en)
DK (1) DK2622151T3 (en)
EA (1) EA034111B1 (en)
ES (1) ES2570802T3 (en)
NO (1) NO335062B1 (en)
WO (1) WO2012044174A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643850A (en) * 2016-10-27 2017-05-10 中国电建集团贵阳勘测设计研究院有限公司 Hydraulic instrument base

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105839545A (en) * 2016-05-16 2016-08-10 中铁十六局集团第五工程有限公司 One-way variable-cross-section adjustable turnover formwork and construction method thereof

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US4016228A (en) * 1973-03-07 1977-04-05 Enor Nominees Pty. Limited Method for progressively constructing a wall of cementitious material
US4054034A (en) * 1976-07-01 1977-10-18 Robert Warren Hyre Method for casting concrete tanks in water
US4314798A (en) * 1979-03-16 1982-02-09 Pettersson John Paul Apparatus for arrangement of combined stationary and slip form casting of concrete
US4701075A (en) * 1984-04-12 1987-10-20 Novolipetsky Politekhnichersky Institut Imeni Leninskogo Komsomola Belorusii Reinforced concrete offshore platform
US5613808A (en) * 1995-03-15 1997-03-25 Amoco Corporation Stepped steel gravity platform for use in arctic and subarctic waters
US6371695B1 (en) * 1998-11-06 2002-04-16 Exxonmobil Upstream Research Company Offshore caisson having upper and lower sections separated by a structural diaphragm and method of installing the same
US20100281819A1 (en) * 2009-05-05 2010-11-11 Thompson Bradley D Slip Formed Concrete Wind Turbine Tower
US20110061321A1 (en) * 2006-09-21 2011-03-17 Ahmed Phuly Fatigue reistant foundation system

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FR1110989A (en) * 1953-10-28 1956-02-20 Skanska Cementgjuteriet Ab Method for pouring concrete walls in sliding molds
JPS5436501Y2 (en) * 1976-11-05 1979-11-05
DE2948255A1 (en) * 1979-11-30 1981-06-04 Philipp Holzmann Ag, 6000 Frankfurt METHOD FOR PROTECTING THE SURFACES OF CONCRETE CONSTRUCTIONS, AND SEALING ELEMENT FOR CARRYING OUT THIS METHOD
JPS6098006A (en) * 1983-11-04 1985-06-01 Mitsui Eng & Shipbuild Co Ltd Concrete structure in icy waters
US4725166A (en) * 1986-01-16 1988-02-16 Santa Fe International Corporation Mobile marine operations structure
JP4427081B2 (en) * 2005-09-28 2010-03-03 グライトバウ ゲスエムベーハー In particular, a method for introducing a built-in part perpendicular to a structure built with a sliding formwork in an annular concrete wall, and an apparatus for carrying out the method
DE102006049037A1 (en) * 2006-10-13 2008-04-24 Lothar Bitschnau Shuttering system for cement coating of walls (1) of tanks for holding media which attack cement comprises inner and outer shuttering attached to support carrying reel of protective sheet which is unrolled between inner shuttering and wall

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016228A (en) * 1973-03-07 1977-04-05 Enor Nominees Pty. Limited Method for progressively constructing a wall of cementitious material
US4054034A (en) * 1976-07-01 1977-10-18 Robert Warren Hyre Method for casting concrete tanks in water
US4314798A (en) * 1979-03-16 1982-02-09 Pettersson John Paul Apparatus for arrangement of combined stationary and slip form casting of concrete
US4701075A (en) * 1984-04-12 1987-10-20 Novolipetsky Politekhnichersky Institut Imeni Leninskogo Komsomola Belorusii Reinforced concrete offshore platform
US5613808A (en) * 1995-03-15 1997-03-25 Amoco Corporation Stepped steel gravity platform for use in arctic and subarctic waters
US6371695B1 (en) * 1998-11-06 2002-04-16 Exxonmobil Upstream Research Company Offshore caisson having upper and lower sections separated by a structural diaphragm and method of installing the same
US20110061321A1 (en) * 2006-09-21 2011-03-17 Ahmed Phuly Fatigue reistant foundation system
US20100281819A1 (en) * 2009-05-05 2010-11-11 Thompson Bradley D Slip Formed Concrete Wind Turbine Tower

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643850A (en) * 2016-10-27 2017-05-10 中国电建集团贵阳勘测设计研究院有限公司 Hydraulic instrument base

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Publication number Publication date
NO20101368A1 (en) 2012-04-02
DK2622151T3 (en) 2016-06-27
WO2012044174A1 (en) 2012-04-05
NO335062B1 (en) 2014-09-01
EA034111B1 (en) 2019-12-27
CA2813195A1 (en) 2012-04-05
CA2813195C (en) 2018-07-24
EA201300391A1 (en) 2013-09-30
EP2622151A1 (en) 2013-08-07
EP2622151B1 (en) 2016-03-30
EP2622151A4 (en) 2014-07-23
ES2570802T3 (en) 2016-05-20

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