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Патент USA US3082618

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March 26, 1963
A. F. DANIELL
-
3,082,608
MARINE PLATFORM
Filed Nov. 18, 1960
3 Sheets-Sheet 1
15
FIG. 2.
14
14
i5
ENTZDg
ATTORNEYS
1 v
March 26, 1963
A. F. DANIELL
3,082,608
MARINE PLATFORM
Filed Nov. 18, 1960
s Sheets-Sheet 2
15
INVENTOR
BY £2“
'
QM
WJIWWIZMMYZYA
ATTORNEYS
March 26, 1963
A. F. DANIELL
3,082,608
MARINE PLATFORM
Filed Nov. 18, 1960
3 Sheets-Sheet 5
14
ATTORNEYS
United States Patent 0 "
1
3,632,668
MARENE PLATFORM
Alan Francis Daniell, London, England, assignor to In
tercontinentai Marine Development Limited, London,
England, a British company
Filed Nov. 18, 1969, Ser. No. ‘70,155
ce
3,982,6li8
Patented Mar. 26, 1963
2
substructure in such manner as to form a series of tri
angles.
Consequently when the platform is partially submerged
due to the large reserve of buoyancy of the substructure,
the mooring cables are subjected to tension and therefore
act as a rigid triangulated structure.
Claims priority, appiication Great Britain May 30, 1960
4 Claims. (Cl. 61-465)
The minimum depth of water to obtain satisfactory
angles on the moorings is of the order of 80 ft., and the
The subject of the present invention is a marine plat
maximum depth is limited only by the practicable di?i
form which may be used as a marine drilling platform 10 culties of handling great lengths of mooring wires.
A typical platform of 100 ft. side would have an ex
for petroleum prospecting, as a shipping terminal for
cess buoyancy of the order of 400 tons when carrying
150 tons of deck equipment and would withstand a hori
will remain precisely in position under the effects of tide, 15 zontal force of about 200 tons without slackening of any
cable and therefore without appreciable movement.
waves or wind and which can be used in depths of water
As indicated in FIGS. 4 and 5, the lines of the mooring
where a platform supported by piles would be expensive
chains 13 and the anchor chains 15 should intersect at or
or impracticable.
adjacent the centre of gravity 116 of each clump 14. Two
In accordance with the invention the platform is formed
with a substructure having a high reserve of buoyancy 20 anchor chains 15 should be provided for each clump 14
and should extend at an angle of about 20° to one an
adapted to be held in submerged condition at a depth
other. As indicated, the clumps 14 may be provided with
unaffected ‘by wave or tide motion by means of a series
?aring pockets 16a to receive the ends of the anchor
of spaced anchorages located on the seat ‘bottom and con
chains 15 and with leads 17 for the mooring cables .13.
nected with the substructure by a series of taut chains
Where the rig is located in deep water, say 300 feet and
or wire cables holding the structure substantially hori
upwards, in order to reduce the catenary effect it may be
zontal.
necessary as shown in FIG. 6 to provide ?otation devices
Preferably the substructure is triangular in plan and
such as hollow steel spheres 18 ?xed at intervals by cables
obtains the major part of its buoyancy from large diam
19 along the mooring cables 13.
eter tubes forming a triangular frame. The upper struc
I claim:
ture is designed to suit individual requirements and is so
1. A marine platform including a buoyant structure
arranged as to offer minimum resistance to Waves and
comprising a sub-structure incorporating hollow tubular
wind. The platform is attached by wire cables or chains
tankers fed by submarine pipe lines, or for any other
use and has for its object to provide a platform which
to heavy mooring clumps arranged in triangular form.
As the platform when partially submerged will have a
large reserve of buoyancy all the mooring wires or chains
are subjected to tension and therefore act as a rigid tri-'
angulated structure. Providing that the weights of moor
ings and the buoyancy of the platform are properly pro
portioned no slackening of the mooring wires or chains‘
side members arranged end~to-end in polygonal formation,
a single mooring clump for each hollow tubular side
member, means connect-ing each mooring clump to an
associated side member at points near the ends thereof,
and spaced anchors connected to each mooring clump,
said anchors being connected to its associated mooring
clump by chains, the chains connecting the anchors to
occurs in loads from wave action wind or incidental 40 their associated mooring clumps and the means connect
loading so that the only movement of the platform is that
due to elastic extension of the mooring cables or chains
and is thus negligibly small. Each mooring preferably
consists of a heavy vessel containing a ‘buoyancy chamber
connected by compressed air lines to the platform so
that the moorings may be ?oated up by admitting com
pressed air and blowing ballast water when it is re
ing each associated mooring clump to the respective asso
ciated sides of the sub-structure extending in lines which
intersect adjacent the center of gravity of the respective
clumps.
2. A marine platform including a buoyant structure
comprising a sub-structure incorporating large diameter
hollow tubular side members arranged end-to-end in tri
quired to move'the rig. The horizontal component of
angular formation, three submersible mooring clumps,
the mooring forces is resisted by laying the chain cables
means for respectively connecting the mooring clumps to
to the length required to suit the particular conditions. 50 the hollow tubular side members ‘at points near the ends
The platform itself and the moorings can therefore be
thereof thereby forming a triangulated structure, and
readily towed from site to site and established at a new
spaced anchors connected to each mooring clump, said
position rapidly and without need for any outside equip
anchors being connected to its associated mooring clump
ment.
by
chains, the chains connecting the anchors to their asso
The accompanying drawing illustrates schematically 55 ciated
mooring clumps and the means connecting each
a preferred form of the invention, FIG. 1 being an eleva
associated mooring clump to the respective associated
tion of the platform in operative position, FIG. 2 a plan
sides of the sub-structure extending in lines which inter
view and FIG. 3 a perspective view thereof. FIG. 4 is an
sect adjacent the center of gravity of the respective clumps.
elevation and FIG. 5 a plan view showing the preferred
form of mooring clump, while FIG. 6 shows in diagram 60 3. A marine platform including a buoyant structure
comprising a generally polygonal sub-structure, a single
form an arrangement of ?otation devices attached to the
mooring clump for each side of said sub-structure, means
mooring cables, and serving, where the rig is located in
connecting each mooring clump to an associated side of
deep water, to reduce the spring of the mooring cables
due to the catenary effect.
said sub-structure at points near the ends thereof, spaced
anchors for said mooring clumps, and means connecting
As shown, the platform 10 is formed with a substruc
ture 11 having a high reserve of buoyancy derived from
large diameter tubes 12 forming a triangular frame. The
platform is attached by wire cables or chains 13 to
heavy mooring clumps 14 which are in turn anchored by
chains 15 to heavy anchorages 15a, the cables extending
from the moorings being connected to the sides of the
each of said anchors to an associated clump, the means
connecting the anchors to their associated mooring clumps
and the means connecting each associated mooring clump
to the respective associated sides of the sub-structure ex
tending in lines which intersect adjacent the center of
gravity of the respective clumps.
3,082,608
4. A marine platform as de?ned in claim 3 in which
the sub-structure -is generally triangular in shape.
References Cited in the ?le of this patent
UNITED STATES PATENTS
' 1,115,752
2,399,656
~
Vick _________________ __ Nov. 3, 1914
Armstrong ____ __~ ______ __ May 7, 1946
5
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2,881,591
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2,939,291
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3,031,997
4
Ault _________________ __. Feb. 8,
Reeve _______________ .. Apr. 14,
Marsh ________________ __ Oct. 13,
Schurman ____________ __ June 7,
Ludwig _______________ __ June 6,
Nesbitt _______________ _. May 1,
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