WO1988002718A1 - Cloche de plongee destinee a etre utilisee lors de travaux dans des zones agitees aupres d'elements cylindriques dresses dans l'eau tels qu'un jambage d'une plate-forme de forage ou d'un pilier de pont - Google Patents

Cloche de plongee destinee a etre utilisee lors de travaux dans des zones agitees aupres d'elements cylindriques dresses dans l'eau tels qu'un jambage d'une plate-forme de forage ou d'un pilier de pont Download PDF

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Publication number
WO1988002718A1
WO1988002718A1 PCT/DK1987/000128 DK8700128W WO8802718A1 WO 1988002718 A1 WO1988002718 A1 WO 1988002718A1 DK 8700128 W DK8700128 W DK 8700128W WO 8802718 A1 WO8802718 A1 WO 8802718A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
diving bell
bell
wall elements
attached
Prior art date
Application number
PCT/DK1987/000128
Other languages
English (en)
Inventor
Ove Dam
Einar Dyhr
Jens Lauritzen
Original Assignee
Ove Dam
Einar Dyhr
Jens Lauritzen
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
Priority claimed from DK500386A external-priority patent/DK500386A/da
Application filed by Ove Dam, Einar Dyhr, Jens Lauritzen filed Critical Ove Dam
Publication of WO1988002718A1 publication Critical patent/WO1988002718A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/34—Diving chambers with mechanical link, e.g. cable, to a base
    • B63C11/36—Diving chambers with mechanical link, e.g. cable, to a base of closed type
    • B63C11/40—Diving chambers with mechanical link, e.g. cable, to a base of closed type adapted to specific work
    • 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
    • E02B17/0034—Maintenance, repair or inspection of offshore constructions

Definitions

  • Diving bell to be used when working in the wave affec ing zone at one in water standing cylindrical element like a leg of a drilling platform or a bridge pillar.
  • the present invention refers to a diving bell used when working in the swell zone around a cylindrical element standing in water such as the legs of a drilling platform or a bridge pillar and comprises two parts which can be closely locked together around the cylindrical object and with a recess suitable for making tight contact with the outside of the cylindrical object.
  • Offshore contructions such as drilling platforms and bridge pillars are very exposed to corrosion in what is known as the swell area, i.e. at the surface of the water where the construction has ample access to the oxygen in the air while water is present. Irrespective of whether the construction is of steel or concrete, it is more exposed to corrosion and degradation in the swell zone than any other part of the contruction which is either continously below or above the water. Regular inspection and maintenance of the construction in the swell zone are therfore necessary. The surface is cleaned by sand blasting and is given a water-resistant coating whose durability shall be regularly maintained.
  • Norwegian Application No. 146 053 illustrates a completely closed working chamber comprising two or more parts which can be locked together in position with an openeing at the bottom and top of the chamber for the cylindrical object.
  • the working chamber has however been shown to be unsuitale for the intended purpose since sand from the sand biasing machine and the layer of material removed from the cylindrical object accumulates at the bottom of the chamber.
  • the quantity of sand used can amount to 500-600 kg which is a considerable increase in the load on the working chamber. There have been instances of such working chambers falling from the leg of a drilling platform.
  • the purpose of the present invention is to provide the diving bell with a design described in the introduction where the waste products are dispersed at the same rate as they are produced. According to the present invention, this is achieved by having the bottom of the diving bell partly or fully open and having a comrpessed air unit to supply compressed air to the ' interior of the diving bell to displace water.
  • the pressure required to keep out the water from within an approximately 5.0 m high diving bell is approximately 0.5 bar, in other words it is sufficiently low to permit work to be carried out at this pressure without any special measures needing to be taken. It is recommended that the compressed air unit and the sand blasting equipment be located outside the diving bell and a bit above it and that they are connected to the diving bell via .hoses which have watertight connections.
  • the design of the diving bell is individual insomuch as it comprises a top section designed for attachment and fastening around the object and a number af wall units designed for attachment to the top section once this has been attached to the object to be cleaned.
  • the upper edges of the wall elements have attachments devices designed to fit the attachment devices around the periphery of the top section, and the wall elements' side edges are designed with connection devices for linking together.
  • the diving bell is contructed of a small number of easily-handled simple parts which can be relatively simply and easily put together, a fact that is important bearing in mind the weather conditions which are experienced around offshore constructions.
  • the diving bell in this manner so that the bottom section and possibly the intermediate deck can be lowered and raised in relation to the top section with the aid of a lowering and raising device, for example in the form af a wi ⁇ e hoist, the parts can be attached around the leg of a drilling platform as a whole after which the intermediate deck and the bottom can be lowered into position.
  • a lowering and raising device for example in the form af a wi ⁇ e hoist
  • the special design of the top section uses a divided top deck with an opening for the object to be cleaned and a framework on the top side whose side is attached to a divided top.
  • assembly can take place by individual parts being grouped around the platform's leg after the bottom section has been fitted in position. The method of procedure will become clearer to the reader in the following account of a concrete example.
  • the design of the jointing of the top section and the wall elements is individual insomuch as the wall elements and their upper end and outside have a horizontal T rail fitted with rollers which runs on the underside of a section on the top deck and where the other edge of the T rail runs on rollers in a suspension device attached to the frames, and where the upper part of the wall element enters the section that is open downwards and which on three inner faces has inflatable sealing strips.
  • the wall elements can be lowered vertically onto the water and then displaced sideways into position.
  • the construction forms a good guide for the elements and the sealing strips are inflated to provide a seal once the elements are in position .
  • connection and sealing devices along the side edges of the wall elements is produced by bending the elements' side edges so that two adjacent side edges can engage each other, and so that at the bottom of one of the recessed edges has a sealing strip. This is a simple design without additional separate attachment devices. Such robust and simple constructions without many small loose parts are necessary for work on offshore structures.
  • the guide and connection devices on the wall elements' lower edge comprises a horizontal T section attached to the element above a hollow section, and with the devices on the bottom support comprising two verticals positioned so that the T piece's flanges slide against the inside of the verticals and the inside of the hollow section towards the outside of the verticals, and where the verticals are flexibly mounted so that they can be radially displaced.
  • the verticals are attached to a plate whose edges grip the guide strip, and where for sideways displacement of the frames there is at least one air or hydraulic cylinder fixed to the structure and the plate, and that for radial displacement there is a cylinder similarly attached to the structure and the plate.
  • a further configuration of the diving bell is that this comprises a number of vertical rods from the periphery of the top section with two links designed either for snapping into fixed contact with the object to be cleaned, and at least two horizontal support rings which can glide down over the verticals and be fastened to them, so that the wall elements are positioned inside the verticals and support rings and that there are coupling devices for attaching the elements to the support rings.
  • The_ design is - characterised in that individual parts are relatively small and thus easier to handle while at the same time installation is simple.
  • Fig. shows a schematic perspective of the diving bell while being attached to the leg of a drilling platform.
  • Fig. 2,3,4 show one half section of the top of the diving bell seen from the side and from above.
  • Fig shows the top of the diving bell seen in perspective, mounted on the drilling platform's leg .
  • Fig. 6 shows a section throught one side of the diving bell and when mounted on the drilling platform's leg.
  • Fig. 7 shows one of the support fittings seen form the side.
  • Fig. 8 shows one of the support fittings seen from the side.
  • Fig. 9 shows a vertical section through a different configuration of the diving bell.
  • Fig. 10 shows a wall element with integral ladders
  • Fig. 11 shows a section through the diving bell at Section A-A in Fig. 9.
  • Fig. 12 shows a section through the diving bell at Section B-B in Fig. 9.
  • Fig. 13 shows the interacting joint between elements on an enlarged scale, c.f. Detail E in Fig. 12.
  • Fig. 14 shows the detail of a joint between the top section and wall elements on an enlarged scale according to Detail C in Fig. 12.
  • Fig. 15 shows a general view from Fig. 14 along line D- D.
  • Fig. 16 shows an enlargement of the connection and guide devices between the support and the wall elements seen from inside the diving bell.
  • Fig. 17 shows the devices in Fig. 16 seen from the side , and
  • Fig. 18 shows the devices from above.
  • Fig. 19-26 illustrate schematically the assembly of the diving bell on a leg of a drilling platform.
  • Fig. 27 a schematically horizontal view of a radial support of a further embodiment of the diving belle according to the invention, shown during mounting on a leg.
  • Fig. 28 shows a cross section through the diving bell during mounting on a leg, and with "some of the wall elements in place.
  • Fig. 29 illustrate schematically mounting of the diving belle on a leg to a drilling pla form.
  • Fig. 30 shows a detail of a joint between the top section and wall elements on an enlarged scale .. according to fig. 29.
  • Fig. 31-39 illustrate schematically the assembly of a further configuration of the diving bell according th the present invention.
  • Fig. 40 shows, purely schematically, the diving bell attached to the leg of the drilling platform.
  • Fig. 41 shows a section in the top of the diving bell.
  • Fig. 42 shows a section in the wall of the diving bell.
  • Fig. 43 shows the general detail of the assembly of the wall elements for the support rings.
  • Fig. 44 shows a general view of the joints between the wall elements.
  • Fig. 45 shows a wall element purely schematically.
  • Fig. 46 shows one of the uprights being moved into during installations.
  • Fig. 47 shows a section of two wall elements for mounting around a transvers pipe or the like.
  • Fig. 48 shows a cross section in a assembly of two wall elements.
  • Fig. 49 shows schematically mounting of a diving bell on a horizontal pipe, and with one connection shown partially in cross section.
  • Fig. 50 shows a cross section in the connection on the horizontal pipe.
  • Fig. 51 illustrates the diving bell mounted around a joint, i.e. an assembly between a vertical leg and a horizontal cylindrical support beam, and
  • Fig. 52 illustates the diving bell mounted on a hori ⁇ zontal pipe and where the bell can be moved along the pipe.
  • the bell is for the sake of clearness shown diaphanous.
  • the diving bell comprises a top section 1 which is clamped to the drilling platform's leg 2, wall element 3, which is hooked on top section 1, and which is supported and attached below by radial support 4.
  • the top section comprises two identical parts la shown in figures 2-4 which can be clamped together around the leg with clamps 5, and in the clamped state there is a recess for leg 2.
  • a peripheral collar 7 for installations with the leg over a rubber liner 8. It is necessary for all assemblies and installations to have a rubber seal to produce the necessary tightness and, for installations with legs, the necessary function for fixing the diving bell to the leg.
  • wall elements 3 there are four wall elements 3, where each constitutes a quarter circle, and which are suspe.'nded by hook * 9 on the top section 1.
  • Wall elements 3 are supported on radial support 4 which . comprises four parts as shown in figures 7 and 8. The four sections are clamped together* around the leg together with the rubber liner, and each section has a bracket 10 upon which the wall element is supported and fixed .
  • top section 1 which is made up of a top cover 12, to which a number of frames 13 can be attached on the top side, and which is also attached to a top 14.
  • the top deck, frames and top are made of segments which can be clamped around the drilling platform's leg 2.
  • Frames 13 are fitted with what are called “slips" 15, a device where the top section can move freely up and down on the leg to the required position. The movement is achieved with aid of wedges 16 and hydraulic cylinders 17.
  • wire winches 18 with twin drums for lowering and raising intermediate deck 19 and a radial support 4.
  • Wire 21 is attached to the intermediate deck 19 and wire 22 is attached to the radial support.
  • the stops are attached to the wall elements.
  • braces 22 which can be swung up from the wall.
  • the radial support 4 is equipped with horizontal air cylinders 23 which can be made to apply pressure against the drilling platform's leg 2 and which thus pushes the lower part of the wall elements according to the principle explained in the following.
  • Radial support 4 is fitted with buoyancy bodies 26 whose buoyancy can be regulated to that top deck 1, intermediate deck and device can be made to float on * water or so that the intermediate deck and device 4 can sink into position in the water.
  • Top deck 12 is a watertight deck sealed against the drilling platform's leg 2 with an inflatable seal 24, for example a rubber tube.
  • a wall element 3 equipped with ladders 25 and buoyancy bodies 26 for anoeuvering the element into position is shown in drawing 9.
  • Drawing 11 shows a section along line A-A in figure 9 where it is possible to see frames 13 which can be attached to two semicircular rings 27',27''and which can be locked around leg 2.
  • the section shown in figure 12 illustrates intermediate deck 19 comprising two semicircular frame constructions 28', 28''which can be joined around leg 2. Gratings are laid across the frame to form a floor. The inner section up to the leg can be covered with loose arc-shaped floor segments 29 so that allowances can be made for various leg thicknesses. 30 indicates a cut in the grid 28 for ladder 25.
  • the jointing of the wall panels along the sides is achieved with a bend 31,32 along the side edges so that two adjacent edges grip each other.
  • a sealing strip 33 At the bottom of one bend there is a sealing strip 33, preferably of rubber, so that the edge of one element forms a seal with it.
  • the shape of the sealing strip is such that the bent part of one element seals the side and with the end of the edge.
  • Figures 14 and 15 show how the" wall * elements "are attached to top section 1.
  • the mounting comprises two rollers 36 upon which the wall element's T rail can. run.
  • the wall element above the wall rail penetrates section 37 which is open at the bottom.
  • roller 38 At control the wall element, the upper side of the T section is fitted with roller 38 at each end of the element, which supports and runs on a bent section of section 37.
  • Three inflatable seals 39',39 ' 'and 39 ' ' ' are fitted in section 37 to seal the wall element against the top section. These seals are fitted to the end of the wall element and on both sides.
  • Figures 16 and 17 shows coupling and control devices for controlling and coupling the wall elements with the bottom support device.
  • the lower ends are fitted with a T rail 39 over a hollow section 40.
  • Radial support 4 is fitted with a plate 41 which supports a guide 42 in the form of two sections 42' and 42 ' ' fitted at a distance from each other and designed so that one side of the wall elements ' s hollow section slides against the other side.
  • the upper end of the two uprights are bevelled in towards the bell and in towards the slot so that the wall element's guides 39,40 can just be gripped during times of difficult working conditions.
  • Base plate 41 is steered by the three edges of guide strip 43.
  • Wall element 3 is pushed up to the rollers and held in position.
  • ⁇ f) Wall element 3 is moved horizontally with the aid of the longitudinal pistons 44'and 44''so that the wall elements grip each other completely.
  • Stop 1 and then stop 2 are applied and the lower support for the intermediate deck is swung up and engaged.
  • the diving bell When installing in marginal weather or in more exposed waters, the diving bell can be assembled as follows:
  • Bottom 4 which may comprise two or more parts is lifted in position and assembled free from the action of waves with the aid of a platform crane of stiffleg mounted on the drilling platform's leg. Bottom 4 is locked to the column.
  • Seal 24 on the top deck is partially inflated, i.e. until a seal is just made and so that the water can be forced out as required. By balancing the amount of air in the bell, it can be brought to any depth that may be required.
  • the wall elements are formed according to the previous con ⁇ figurations, however so that they are fitted with two gui ⁇ des at the bottom edges.
  • the bottom platform or support de ⁇ vices 4 is shown on fig. 28. It consists of several circle segments 61 for example four, six or eight having fitted a double operating hydraulic piston 62. The segments 61 can mutually be radially and individially dislocated, but are tangentially connected by a double-acting hydraulic cylin ⁇ der. The whole platform can be opened as two 180 degree segments with a hinge 63 mounted on the outside.
  • the top and bottom platform can as previously be launc ⁇ hed from a boat as a unit.
  • the unit floats with the aid of bags filled with air.
  • the unit is connected with the boat by an airtube.
  • the unit is lowered under the water (well zone) and with the aid of a wire is pulled onto the steel and concrete structure to be treated. This process is assisted by divers.
  • the unit is in open position as shown on fig. 64.
  • top deck moves upwards until top position is reached. Then the top deck is locked.
  • Wall elements 3 are lauched one after the other.
  • First wall elements 3a is mounted turning outwards couplingrails . Toat is done by divers fastening of two wires to bottom of the wall element 3a while floating in safe distance from the platform. The wall element is then pulled downwards and towards the bottom 4 and being pressed into the two guides 67 mounted on the platform.
  • each wall element 3a being guided back to the bottom and thus away from the well movements, the wall element is pul ⁇ led in contact with the top section 1 and resting on the conical surface 68 shown on fig. 68.
  • the mounting continues by placing of wall elements 3b having in turning couplings, so that every second wall element 3b has in turning couplings and every sencond 3a has outwards tur ⁇ ning couplings.
  • the guide on the bottom platform 4 is pulled to its utter- most position by pressure pistons 62.
  • the pistons 62 are activated and the wall element is pulled into contact with wall ele ⁇ ments as shown on fig. 28.
  • Figures 31-46 show an additional configuration of diving bell according to the present invention.
  • the bell comprises a top section 1 designed to be clamped around the drilling platform's leg 2.
  • the top -section comprises an inner ring 45 with the "slip" referred to earlier, and an outer ring 46, which constitute the top deck.
  • Verticals 47 can be attached to the upper section, which below have links 47' and 47'' designed for snapping onto the drilling platform's legs for support. To engage and hold the horizontal support rings 48 and 49 there are hooks 50 in verticals 47.
  • the underside has a longitudinal dovetail groove 51, which can interact with bolts or pins on the support rings since these have a head which fits groove 51.
  • angular bend 53 For interconnection of wall elements 3, their longitudinal edges have an angular bend 53 so that two opposing support edges can engage each other.
  • the angular bends can be provided with a scarf and sealing strip 54.
  • Figure 29 shows the assembly between the wall elements' upper edge and the top section.
  • the periphery of the top section has groove with a bevelled edge facing the middle of the bell.
  • the upper edge of the wall element is bevelled 56, so that the edge can engage the groove.
  • On the underside of the element is a support flap 57, which supports against the edge of the upper section's groove ..
  • the inner ring 45 is assembled on the leg, see figure 20.
  • Top section 1 and wall elements 3 can be designed as a sandwich construction of glass fibre and fitted with steps, lighting and other equipment that may be necessary. Similarly, working gratings can be fitted at different levels.
  • the top section is fitted with a manhole 11 and the necessary services penetrations for compressed air and sand blasting.
  • the basis contruction of the diving bell is mounted as pre- viously described, but at the transverse pipes 70 a wall element 71 in two parts with a half circular cut out 72 in the junctional end edges is used and in the cut outs a with compressed air inflated tube 73 is mounted.
  • the wall element 3 is mounted as usually next to the transverse pipe 70 and then the bottom wall element 71a is mounted.
  • the top wall element 71b is moved and lifted to contact with the guide in attaching wal element 3 and then it is slided down in contact with the wall element 71a.
  • Spring mountings 74 keep the wall elements 71a, 71b toge ⁇ ther.
  • the inflatable half circular tubes 73 are inflated for tightening of the transverse tube 70.
  • the configuration shown in fig. 49,50 makes the diving bell - when mounted on a horizontal tube element 70 - to move there along. That is done by locking and closing alternate ⁇ ly of inflatable half circular tubes 73.
  • the connection to the horizontal tube element 70 is for ⁇ med as a short telescopic tube 75 with an inflatable tube 73a , 73 -fitted at each end.
  • air pistons and hy- • draulic pistons are connected between the wall element and the end of the telescopic tube.
  • the telescopic tube is pulled together and the tube 73b activated.
  • the pressure is relie ⁇ ved and the bell is moved. Then the pistons reverses to the starting position ready to the next movement. So the bell can move gradually along a horinzontal pipe or a sloping pipe .
  • a diving bell which is easy to assemble and dismantle on off ⁇ shore constructions, as well on horizontal as on inclining pipe pieces.
  • the bell can also bee made of imperishable ma ⁇ terials. Furhtermore, sand from the sandblasing and the coatings removed disappear through the bottom of the bell

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Une cloche de plongée, destinée à être utilisée lors de travaux dans des zones agitées auprès d'éléments cylindriques dressés dans l'eau tels qu'un jambage (2) d'une plate-forme de forage ou d'un pilier de pont, se compose d'au moins deux parties connectées ou séparées (1, 3) qui peuvent être plaquées l'une contre l'autre en position étanche et immobile autour de l'élément cylindrique. Une ouverture (6) est ménagée dans la cloche afin que celle-ci puisse s'adapter de façon étanche et immobile à la surface de l'élément cylindrique (2). Le fond de la cloche est complètement ou partiellement ouvert et un dispositif pneumatique est prévu pour acheminer de l'air comprimé à l'intérieur de la cloche afin d'en chasser l'eau. Grâce à cet agencement, les déchets produits ne sont pas recueillis à l'intérieur de la cloche, où l'espace est limité, mais peuvent en être évacués par le bas.
PCT/DK1987/000128 1986-10-17 1987-10-19 Cloche de plongee destinee a etre utilisee lors de travaux dans des zones agitees aupres d'elements cylindriques dresses dans l'eau tels qu'un jambage d'une plate-forme de forage ou d'un pilier de pont WO1988002718A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK500386A DK500386A (da) 1985-10-17 1986-10-17 Dykkerklokke til brug ved arbejde i skvulpezonen paa et cylindrisk emne staaende i vandet, saasom benene paa en boreplatform eller bropille
DK5003/86 1986-10-17

Publications (1)

Publication Number Publication Date
WO1988002718A1 true WO1988002718A1 (fr) 1988-04-21

Family

ID=8138576

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1987/000128 WO1988002718A1 (fr) 1986-10-17 1987-10-19 Cloche de plongee destinee a etre utilisee lors de travaux dans des zones agitees aupres d'elements cylindriques dresses dans l'eau tels qu'un jambage d'une plate-forme de forage ou d'un pilier de pont

Country Status (2)

Country Link
AU (1) AU8158587A (fr)
WO (1) WO1988002718A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0533649A1 (fr) * 1991-09-18 1993-03-24 General Coatings Dispositif pour assurer l'étanchéité à l'eau de caissons
US5324140A (en) * 1991-03-18 1994-06-28 Lopez Jose De Jesus F S Flexible submersible compartment
US7770338B2 (en) 2004-08-10 2010-08-10 Abdessatar Nefzi Method for producing triangular elements designed for the manufacture of structures and resulting triangular elements
CN101746493B (zh) * 2010-01-29 2012-06-27 纪建阳 一种水底观光潜水系统
GB2523705B (en) * 2012-12-28 2017-08-02 1 Diamond Llc Sawing system, sawing support structure and a wire replacement unit and method
US10046405B2 (en) 2014-11-26 2018-08-14 Quanta Associates, L.P. Salvage sawing system and method
US11339549B2 (en) 2018-01-30 2022-05-24 Quanta Associates, L.P. Inclined cut GBS leg

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386254A (en) * 1966-04-26 1968-06-04 Reading & Bates Offshore Drill Underwater work vessel
US3991583A (en) * 1973-04-10 1976-11-16 Scurlock John T Method of providing an underwater enclosure
FR2410597A1 (fr) * 1977-12-01 1979-06-29 Expertises Sa Cie Maritime Chambre sous-marine et procede pour realiser des travaux dans une atmosphere de gaz sur des elements de forme allongee
NO146053B (no) * 1980-09-19 1982-04-13 Harald Andersen Wallevik Arbeidskammer til bruk ved undervannsarbeider.
WO1986006121A1 (fr) * 1985-04-11 1986-10-23 Maple Engineering Projects Limited Dispositif d'entretien des jambes d'une plate-forme pour forages en mer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386254A (en) * 1966-04-26 1968-06-04 Reading & Bates Offshore Drill Underwater work vessel
US3991583A (en) * 1973-04-10 1976-11-16 Scurlock John T Method of providing an underwater enclosure
FR2410597A1 (fr) * 1977-12-01 1979-06-29 Expertises Sa Cie Maritime Chambre sous-marine et procede pour realiser des travaux dans une atmosphere de gaz sur des elements de forme allongee
NO146053B (no) * 1980-09-19 1982-04-13 Harald Andersen Wallevik Arbeidskammer til bruk ved undervannsarbeider.
WO1986006121A1 (fr) * 1985-04-11 1986-10-23 Maple Engineering Projects Limited Dispositif d'entretien des jambes d'une plate-forme pour forages en mer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5324140A (en) * 1991-03-18 1994-06-28 Lopez Jose De Jesus F S Flexible submersible compartment
EP0533649A1 (fr) * 1991-09-18 1993-03-24 General Coatings Dispositif pour assurer l'étanchéité à l'eau de caissons
BE1005308A3 (nl) * 1991-09-18 1993-06-22 Gen Coatings Inrichting voor het waterdicht maken van een caisson.
US5292206A (en) * 1991-09-18 1994-03-08 General Coatings Device for sealing a caisson in a watertight way
US7770338B2 (en) 2004-08-10 2010-08-10 Abdessatar Nefzi Method for producing triangular elements designed for the manufacture of structures and resulting triangular elements
CN101746493B (zh) * 2010-01-29 2012-06-27 纪建阳 一种水底观光潜水系统
GB2523705B (en) * 2012-12-28 2017-08-02 1 Diamond Llc Sawing system, sawing support structure and a wire replacement unit and method
US10786855B2 (en) 2012-12-28 2020-09-29 1 Diamond, Llc Sawing system, sawing support structure and a wire replacement unit and method
US10046405B2 (en) 2014-11-26 2018-08-14 Quanta Associates, L.P. Salvage sawing system and method
US11339549B2 (en) 2018-01-30 2022-05-24 Quanta Associates, L.P. Inclined cut GBS leg

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Publication number Publication date
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