GB2136482A - Offshore tower structure - Google Patents
Offshore tower structure Download PDFInfo
- 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- Withdrawn
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
- Foundations (AREA)
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)
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.
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)
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 |
CN102852156A (en) * | 2012-08-01 | 2013-01-02 | 天津大学 | Composite pile foundation structure |
CN102852154A (en) * | 2012-08-01 | 2013-01-02 | 天津大学 | Composite pile foundation |
Citations (3)
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 |
-
1983
- 1983-03-18 GB GB08307639A patent/GB2136482A/en not_active Withdrawn
Patent Citations (4)
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)
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 |
CN102852156A (en) * | 2012-08-01 | 2013-01-02 | 天津大学 | Composite pile foundation structure |
CN102852154A (en) * | 2012-08-01 | 2013-01-02 | 天津大学 | Composite pile foundation |
Also Published As
Publication number | Publication date |
---|---|
GB8307639D0 (en) | 1983-04-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |