GB2136482A - Offshore tower structure - Google Patents

Offshore tower structure Download PDF

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Publication number
GB2136482A
GB2136482A GB08307639A GB8307639A GB2136482A GB 2136482 A GB2136482 A GB 2136482A GB 08307639 A GB08307639 A GB 08307639A GB 8307639 A GB8307639 A GB 8307639A GB 2136482 A GB2136482 A GB 2136482A
Authority
GB
United Kingdom
Prior art keywords
base frame
column
central column
support legs
sea bed
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.)
Withdrawn
Application number
GB08307639A
Other versions
GB8307639D0 (en
Inventor
Jan Meek
Kees Willemse
Finn Michelsen
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.)
HEEREMA ENGINEERING
Original Assignee
HEEREMA ENGINEERING
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HEEREMA ENGINEERING filed Critical HEEREMA ENGINEERING
Priority to GB08307639A priority Critical patent/GB2136482A/en
Publication of GB8307639D0 publication Critical patent/GB8307639D0/en
Publication of GB2136482A publication Critical patent/GB2136482A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto

Abstract

An offshore tower structure comprises a central column (11) for supporting a platform (13) above the level of the sea (14). The column (11) extends upwardly from a base frame (10) and is braced by three support legs (12). The entire structure is rigid or stiff and is fixed directly to the sea bed (15) by means of piles driven through sleeves (18) located at each corner (16) of the base frame (10). <IMAGE>

Description

SPECIFICATION Offshore tower structures This invention relates to Offshore Tower Structures. According to the invention there is provided an offshore tower structure comprising a rigid base frame, a central column for carrying services from said base frame to above the water level, in use, for supporting a platform and/or mooring a vessel, and at least two support legs each extending between an upper portion of the column and the base frame at points spaced horizontally from the column, the legs being rigidly attached to the base frame at said spaced points and to the column, and the column being rigidly attached to said base frame whereby the whole structure is rigid, means being provided for fixing the structure to the sea bed at points spaced horizontally from the column.
The structure preferably has three support legs.
The base frame, central column and support legs are all preferably round tubular metal members and are attached preferably by welding. The structure is preferably fixed directly to the sea bed by means of piles driven through sleeves on the base frame. The sleeves are preferably arranged on the base frame adjacent to the foot of each support leg.
The base frame is preferably polygonal with the said spaced points being the corners of the polygon.
By way of example, an embodiment of the present invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a side elevation of an offshore tower structure according to the invention, and Figure 2 is a plan view of the base frame of the structure.
An offshore tower structure comprises a base frame 10, a central column 11 and three support legs 1 2. The central column 11 extends generally perpendicularly upwardly from the base frame 10, which is generally planar, and supports a platform 1 3 above the water level 14. The central column 11 may carry services such as conductors and risers from the sea bed 1 5 to the platform 1 3. If desired the inside of the column 11 may be kept dry.
The base frame 10 is in the form of an equilateral triangle, each apex 1 6 of the frame being the point at which the lower end of each support leg 1 2 is attached to the base frame.
The upper end of each support leg 1 2 is attached to an upper portion of the central column 11. The configuration of the joint between each support leg 1 2 and the central column 11 is the subject of our Copending British Application No. 8212699. The base frame 10 further has three struts 1 7 which extend inwardly from the apices 1 6 and are rigidly attached to the central column 11. The base frame 10, central column 11 and support legs 1 2 are all hollow cylindrical steel members and the respective joints between these members are effected by welding or grouting. This means that the whole structure is rigid. The base frame 10 further comprises, at each apex 16, a tubular sleeve member 18, arranged generally at right angles to the plane of the base frame.The tower structure is fixed directly to the sea bed 1 5 by driving piles into the sea bed through the sleeve members 1 8.
To give an indication of the sort of dimensions associated with a construction of this kind: in one particular example of a tower structure according to the invention for installation on the sea bed in about 1 00m of water, the central column would be of 100mm thick X 5m outer diameter steel tubular, the support legs would each be of 50mm thick X 3m OD steel tubular and the base frame members would be of 50mm thick X 2.5m OD steel tubular. The length of each support leg would be about 78m and the overall length of the central column would be approximately 1 30m. Furthermore, it will be appreciated that structures of this kind can be built for installation on the sea bed in depths of water exceeding 1 00m, or indeed in shallower waters.
The embodiment described above comprises three support legs for the column, but it will be appreciated that the structure need only incorporate two support legs which could be arranged at right angles to each other.
The configuration of the joint between each support leg 1 2 and each apex 1 6 of the base frame 10 is the subject of our copending British Application No
CLAIMS 1. An offshore structure comprising a rigid base frame, a central column for carrying services extending from said base frame to above the water level, in use, for supporting a platform, and/or mooring a vessel, and at least two support legs each extending between an upper portion of the column and the base frame at points spaced horizontally from the column, the legs being rigidly attached to the base frame at said spaced points and to the column, and the column being rigidly attached to said base frame whereby the whole structure is rigid, means being provided for fixing the structure to the sea bed at points spaced horizontally from the column.
2. A structure as claimed in Claim 1 wherein there are three support legs.
3. A structure as claimed in Claim 1 or Claim 2 wherein the central column, support legs and base frame are all round tubular metal members.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Offshore tower structures This invention relates to Offshore Tower Structures. According to the invention there is provided an offshore tower structure comprising a rigid base frame, a central column for carrying services from said base frame to above the water level, in use, for supporting a platform and/or mooring a vessel, and at least two support legs each extending between an upper portion of the column and the base frame at points spaced horizontally from the column, the legs being rigidly attached to the base frame at said spaced points and to the column, and the column being rigidly attached to said base frame whereby the whole structure is rigid, means being provided for fixing the structure to the sea bed at points spaced horizontally from the column. The structure preferably has three support legs. The base frame, central column and support legs are all preferably round tubular metal members and are attached preferably by welding. The structure is preferably fixed directly to the sea bed by means of piles driven through sleeves on the base frame. The sleeves are preferably arranged on the base frame adjacent to the foot of each support leg. The base frame is preferably polygonal with the said spaced points being the corners of the polygon. By way of example, an embodiment of the present invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a side elevation of an offshore tower structure according to the invention, and Figure 2 is a plan view of the base frame of the structure. An offshore tower structure comprises a base frame 10, a central column 11 and three support legs 1 2. The central column 11 extends generally perpendicularly upwardly from the base frame 10, which is generally planar, and supports a platform 1 3 above the water level 14. The central column 11 may carry services such as conductors and risers from the sea bed 1 5 to the platform 1 3. If desired the inside of the column 11 may be kept dry. The base frame 10 is in the form of an equilateral triangle, each apex 1 6 of the frame being the point at which the lower end of each support leg 1 2 is attached to the base frame. The upper end of each support leg 1 2 is attached to an upper portion of the central column 11. The configuration of the joint between each support leg 1 2 and the central column 11 is the subject of our Copending British Application No. 8212699. The base frame 10 further has three struts 1 7 which extend inwardly from the apices 1 6 and are rigidly attached to the central column 11. The base frame 10, central column 11 and support legs 1 2 are all hollow cylindrical steel members and the respective joints between these members are effected by welding or grouting. This means that the whole structure is rigid. The base frame 10 further comprises, at each apex 16, a tubular sleeve member 18, arranged generally at right angles to the plane of the base frame.The tower structure is fixed directly to the sea bed 1 5 by driving piles into the sea bed through the sleeve members 1 8. To give an indication of the sort of dimensions associated with a construction of this kind: in one particular example of a tower structure according to the invention for installation on the sea bed in about 1 00m of water, the central column would be of 100mm thick X 5m outer diameter steel tubular, the support legs would each be of 50mm thick X 3m OD steel tubular and the base frame members would be of 50mm thick X 2.5m OD steel tubular. The length of each support leg would be about 78m and the overall length of the central column would be approximately 1 30m. Furthermore, it will be appreciated that structures of this kind can be built for installation on the sea bed in depths of water exceeding 1 00m, or indeed in shallower waters. The embodiment described above comprises three support legs for the column, but it will be appreciated that the structure need only incorporate two support legs which could be arranged at right angles to each other. The configuration of the joint between each support leg 1 2 and each apex 1 6 of the base frame 10 is the subject of our copending British Application No CLAIMS
1. An offshore structure comprising a rigid base frame, a central column for carrying services extending from said base frame to above the water level, in use, for supporting a platform, and/or mooring a vessel, and at least two support legs each extending between an upper portion of the column and the base frame at points spaced horizontally from the column, the legs being rigidly attached to the base frame at said spaced points and to the column, and the column being rigidly attached to said base frame whereby the whole structure is rigid, means being provided for fixing the structure to the sea bed at points spaced horizontally from the column.
2. A structure as claimed in Claim 1 wherein there are three support legs.
3. A structure as claimed in Claim 1 or Claim 2 wherein the central column, support legs and base frame are all round tubular metal members.
4. A structure as claimed in Claim 1, Claim 2 or Claim 3 wherein the means for attaching the respective members of the structure to each other is by welding or grouting.
5. A structure as claimed in any preceding claim wherein the means for fixing the structure to the sea bed comprises piles which are driven through sleeves on the base frame.
6. A structure as claimed in Claim 5 wherein the sleeves are arranged on the base frame each adjacent to the foot of a support leg.
7. A structure as claimed in any preceding claim wherein the base frame is polygonal, the said spaced points being at the corners of the polygon.
8. An offshore tower structure substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB08307639A 1983-03-18 1983-03-18 Offshore tower structure Withdrawn GB2136482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08307639A GB2136482A (en) 1983-03-18 1983-03-18 Offshore tower structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08307639A GB2136482A (en) 1983-03-18 1983-03-18 Offshore tower structure

Publications (2)

Publication Number Publication Date
GB8307639D0 GB8307639D0 (en) 1983-04-27
GB2136482A true GB2136482A (en) 1984-09-19

Family

ID=10539874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08307639A Withdrawn GB2136482A (en) 1983-03-18 1983-03-18 Offshore tower structure

Country Status (1)

Country Link
GB (1) GB2136482A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306145A1 (en) * 1987-09-04 1989-03-08 Cooper Industries, Inc. Caisson tower platform and method of setting same
US5332336A (en) * 1992-11-16 1994-07-26 Kvaerner Earl And Wright, Inc. Offshore base-supported column structure and method of installation
GB2290334A (en) * 1994-06-14 1995-12-20 Kvaerner Earl & Wright Offshore platform and method of installation
GB2292405A (en) * 1994-08-19 1996-02-21 Mcdermott Int Inc Offshore structures.
GB2467842A (en) * 2009-02-12 2010-08-18 Marine Current Turbines Ltd A submerged support structure with adjustable feet secured by piling
GB2481906A (en) * 2010-07-05 2012-01-11 Marine Current Turbines Ltd A template structure for erecting underwater columns
CN102852155A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation
CN102852154A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation
CN102852156A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1446367A (en) * 1974-01-11 1976-08-18 Ingeco Spa Marine monomooring terminal
EP0059651A1 (en) * 1981-03-04 1982-09-08 Heerema Engineering Service B.V. Offshore tower structures
GB2102482A (en) * 1981-07-16 1983-02-02 Agip Norsk Offshore mooring structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1446367A (en) * 1974-01-11 1976-08-18 Ingeco Spa Marine monomooring terminal
EP0059651A1 (en) * 1981-03-04 1982-09-08 Heerema Engineering Service B.V. Offshore tower structures
GB2096673A (en) * 1981-03-04 1982-10-20 Platform Service Sa Offshore tower structures
GB2102482A (en) * 1981-07-16 1983-02-02 Agip Norsk Offshore mooring structure

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306145A1 (en) * 1987-09-04 1989-03-08 Cooper Industries, Inc. Caisson tower platform and method of setting same
US5332336A (en) * 1992-11-16 1994-07-26 Kvaerner Earl And Wright, Inc. Offshore base-supported column structure and method of installation
GB2290334A (en) * 1994-06-14 1995-12-20 Kvaerner Earl & Wright Offshore platform and method of installation
GB2290334B (en) * 1994-06-14 1998-02-04 Kvaerner Earl & Wright Offshore platform and method of installation/reinstallation
GB2292405A (en) * 1994-08-19 1996-02-21 Mcdermott Int Inc Offshore structures.
GB2292405B (en) * 1994-08-19 1998-05-06 Mcdermott Int Inc Offshore structures
GB2467842A (en) * 2009-02-12 2010-08-18 Marine Current Turbines Ltd A submerged support structure with adjustable feet secured by piling
CN102362033A (en) * 2009-02-12 2012-02-22 船舶通用涡轮有限公司 Installing submerged support structures
GB2467842B (en) * 2009-02-12 2013-11-13 Marine Current Turbines Ltd Installing submerged support structures
CN102362033B (en) * 2009-02-12 2014-09-24 船舶通用涡轮有限公司 Installing submerged support structures
GB2481906A (en) * 2010-07-05 2012-01-11 Marine Current Turbines Ltd A template structure for erecting underwater columns
CN102852155A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation
CN102852154A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation
CN102852156A (en) * 2012-08-01 2013-01-02 天津大学 Composite pile foundation structure

Also Published As

Publication number Publication date
GB8307639D0 (en) 1983-04-27

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)