Ships – Floating platform – Multiple leg
Patent
1986-08-26
1988-09-20
Basinger, Sherman D.
Ships
Floating platform
Multiple leg
403237, 52655, B63B 3544
Patent
active
047717203
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a construction of a joint portion of a semi-submerged marine structure.
BACKGROUND ART
Semi-submerged marine structures generally have such a structure in which a plurality of columns having their respective upper portion projecting above water surface are built on each of a plurality of submerged bodies held in water and, while a platform is supported on and by all the columns, correspondingly located columns on respective submerged bodies are supported in pairs by bracings.
Then, according to the prior art, the bracing is secured with its portion having a larger cross-sectional area to the column in a manner such that a connection portion of the bracing at which the portion having a larger cross-sectional area and a tapering portion are connected to each other is disposed outside the column, so that the problem is encountered that stress concentrates at the connection portion to produce cracking therein.
The present invention aims at avoiding the concentration of stress at the connection portion in or of the bracings.
DISCLOSURE OF THE INVENTION
Thus, the present invention provides a construction of a joint portion in or of a semi-submerged marine structure in which a plurality of columns having their respective upper portion projecting above water surface are built on each of a plurality of submerged bodies held in water and, while a platform is supported on and by all the columns, correspondingly located columns on respective submerged bodies are supported in pairs by bracings, characterized in that a tapering portion the cross-sectional area of which increases gradually toward a forward end of the bracing, provided at an end of a portion of the bracing which has a smaller cross-sectional area, is secured to an outer plate of the column in a manner such that a connection portion of the tapering portion and a portion of the bracing having a larger cross-sectional area is disposed in the interior of the column.
Attributable to this construction, according to the present invention the concentration of stress in the connection portion at which the tapering portion and the portion having a larger cross-sectional area of the bracing are connected together can be avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view, partly in section, showing an example of the construction of a joint portion in or of a semi-submerged marine structure pertaining to the present invention;
FIGS. 2 to 12 are plan views, partly in section, respectively showing another example of the construction of a joint portion in or of a semi-submerged marine structure pertaining to the present invention;
FIG. 13 shows a front view of a semi-submerged marine structure of the prior art; and
FIG. 14 shows a sectional view, taken on line A--A in FIG. 13.
BEST MODE FOR THE CARRYING-OUT OF THE INVENTION
Generally, semi-submerged marine structures such as the one shown at 1 have such a structure in which a plurality of columns 3 having their respective upper portion projecting above a water surface W are built on each of a plurality of submerged bodies 2 held in water and, while a platform 4 is supported on and by all the columns 3, the correspondingly located columns 3 and 3 on the submerged bodies are supported in pairs by bracings 5.
Then, according to the prior art, as illustrated in FIG. 14 the bracing 5 is secured with its portion having a larger cross-sectional area, 6, to an outer plate 11 of the column 3 in a manner such that a connection portion 8 of the bracing 5 at which the portion having a larger cross-sectional area 6 and a tapering portion 7 are connected to each other is disposed outside the column 3, so that the problem is encountered that stress tends to concentrate at the connection portion 8 to produce cracking in this portion.
The present invention, which has for its object to cancel the above-indicated problem in the prior art, is possessed of the following structural features.
FIG. 1 shows a construction of a joint portion in a semi-submerged marine struct
REFERENCES:
patent: 3485050 (1969-12-01), Martinovich
patent: 3841249 (1974-10-01), Vilian
patent: 4646672 (1987-03-01), Bennett et al.
European Patent Application No. 0094156 Heerema, Nov. 1983.
Inui Taiji
Maeda Noriharu
Yuzuriha Yoshiyuki
Basinger Sherman D.
Mitsui Engineering & Shipbuilding Co. Ltd.
Swinehart Edwin L.
LandOfFree
Construction of joint portion of semi-submerged marine structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Construction of joint portion of semi-submerged marine structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Construction of joint portion of semi-submerged marine structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1742486