Hydraulic and earth engineering – Marine structure or fabrication thereof – Floatable to site and supported by marine floor
Patent
1990-03-05
1991-12-31
Taylor, Dennis L.
Hydraulic and earth engineering
Marine structure or fabrication thereof
Floatable to site and supported by marine floor
405222, 405252, 264 32, 264 34, 264 35, 264256, 264262, 264274, E02D 2500
Patent
active
050767321
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for the construction of concrete shafts for a platform or similar structure which may for instance rest on the seabed, where one or several shafts will be outfitted with relatively much equipment.
The present invention in addition relates to a section to be used as an internal formwork and/or stiffening for the construction of a concrete shaft in a platform or similar structure which may for instance rest on the seabed.
So far, it has been common to use traditional slipforming for the construction of a platform or similar structure. This means that the shaft must first be constructed in its full height, and any outfitting in the shaft must be subsequently performed. Thus, considerable work and time will be spent on the outfitting of the shafts with said equipment after the completed casting of the shafts. This gives substantial additional construction cost.
By outfitting the individual concrete shaft of the said type with the necessary equipment simultaneously with the casting of the shafts, the present invention is intended to reduce the required construction time and thus also the costs. In other words, the intention, at least for the shafts to be outfitted with equipment, is to construct the shafts in a new way, while other shafts, if any, are constructed by means of traditional slipforming. It should be observed that the advantages of the invention increase with the depth of the water.
The new construction method according to the invention is characterized by the shafts of the said type being constructed of prefabricated sections which are consecutively installed butt-in-butt on top of each other and which are left in the shaft as an internally fully shaped shaft component, as the sections internally contain the associated equipment and externally feature bodies for mounting of easily removable formwork elements or attachments for slip-forming. The sections either serve as internal formwork where the external formwork is subsequently installed, or alternatively, as an attachment for internal formwork as they are built up by means of tubulars on which the internal and external formworks are attached. The space between the formworks is filled with reinforcement and concrete, by a per se known procedure, and is thus moved up to a higher level.
According to the invention, the advantage of this is that said sections may be built in heights of 15-20 m, which may in their turn be put together to form longer sections onshore prior to being transferred to the platform. The sections which form the internal formwork or attachment for the internal formwork may be prefabricated on an appropriate construction site with associated equipment completely installed in sections, in an easily accessible way on an appropriate installation site - and said sections may later be consecutively installed in the shaft, which is under construction, in a relatively simple and accurate way. The easily accessible section provides a correspondingly effective installation of the equipment in each individual section. In addition, a particularly rational installation of the equipment in the different sections is provided, as the sections can be constructed and outfitted with equipment independently of the construction of the actual shaft.
As soon as one section has been installed in the shaft, which is under construction, this part of the shaft has simultaneously been prefabricated internally, and the different sections can subsequently be consecutively attached on top of each other and the shaft can be prefabricated internally, as the shaft is gradually constructed. Consequently, when the casting of the shaft is completed, the shaft will simultaneously be fully outfitted internally. Thus, the total time spent on the platform construction or similar structure can to a considerable extent be reduced by a corresponding reduction of the otherwise normal time spent on the outfitting of shafts.
A section according to the invention is characterized by comprising a cylindrically shaped section with a di
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Coker John W. A.
Gudmestad Ove T.
Stead Brian L.
Warland Terje A.
Den Norske Stats Oljeselskap A.S.
McBee J. Russell
Taylor Dennis L.
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