WO1992020947A1 - Element de canalisation et procede de pose de pipelines sous terre - Google Patents

Element de canalisation et procede de pose de pipelines sous terre Download PDF

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Publication number
WO1992020947A1
WO1992020947A1 PCT/NO1992/000094 NO9200094W WO9220947A1 WO 1992020947 A1 WO1992020947 A1 WO 1992020947A1 NO 9200094 W NO9200094 W NO 9200094W WO 9220947 A1 WO9220947 A1 WO 9220947A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
channel element
skirts
seabed
elements
Prior art date
Application number
PCT/NO1992/000094
Other languages
English (en)
Inventor
Ove T. Gudmestad
Tor Inge Tjelta
Original Assignee
Den Norske Stats Oljeselskap A.S.
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
Application filed by Den Norske Stats Oljeselskap A.S. filed Critical Den Norske Stats Oljeselskap A.S.
Publication of WO1992020947A1 publication Critical patent/WO1992020947A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/18—Foundations formed by making use of caissons
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/06—Methods of, or installations for, laying sewer pipes

Definitions

  • This invention relates to a channel element for burying pipelines for bringing ashore, for example, gas and/or oil in regions where the seabed consists of loose masses such as sand.
  • the invention also comprises a method for such burying of pipelines.
  • Beaches and marshlands in particular are of interest in this connection, since nature conservation con ⁇ siderations, inter alia, can make it difficult to use conven ⁇ tional and known methods for bringing ashore pipelines of the kind contemplated here.
  • These pipelines can have large dimensions and this accentuates the problems of gentle and safe conveyance to dry land.
  • Another method consists in pulling the pipeline from the sea onto the land and subsequently to plough it down after laying in the desired path.
  • This method requires large equipment units for pulling the pipe and a special plough for the burying.
  • the seabed which often consists of sand, will be able to slide in, so that the necessary trench to be ploughed will be rather wide.
  • the mass can be carried off by tide water and waves so that the requi ⁇ red cover cannot be guaranteed.
  • wounds in the land ⁇ scape can be the result.
  • a further known method is directed to fluidizing the loose masses underneath the pipe sections in order to form a wide trench.
  • a drawback here is that the filling of the trench is difficult.
  • the channel element according to the invention comprises an upwardly open cross-section having side walls, and a bottom which internally is adapted to support one or more pipelines.
  • the invention makes it possible to install pipelines through a shore zone in a environment-friendly manner, so that the problems involved with available, known technology are avoided. Moreover, this new method may lead to savings because it does not require the use of large and heavy machi ⁇ nes and equipment for the construction work.
  • fig. 1 shows a simplified cross-section of a channel el ⁇ ement of concrete placed on the seabed and with a pipeline arranged on the bottom of the channel element
  • fig. 2 shows a corresponding cross-section as in fig. 1, after lowering the channel element to the desired level
  • fig 3 shows in schematic longitudinal section a series of channel elements in buried position with an asso- ciated pipeline extending from the sea through a shore zone.
  • the element comprises a bottom 13 and side walls 1A and IB.
  • the internal chamber thereby formed serves to receive one or more pipelines 3, which usually will be pulled in, in their longitudinal direc ⁇ tion from the sea, in order to be extended through a shore zone, e.g. a marshland.
  • the bottom 13 can be covered with a fric ⁇ tion reducing coating 13A, e.g. of teflon or a similar mate ⁇ rial.
  • the concrete element 1 is placed on a seabed 2, for example by means of a crane which can be moved on the seabed by caterpillar means, or it can be run successively out on rails being provided on the elements as these are laid out with a starting point on more or less dry land.
  • a particular crane vessel which can operate in very shallow water.
  • plate-shaped skirts 11A and 11B respec ⁇ tively, which project downwards to a suitable distance under ⁇ neath the bottom 13.
  • the space 16 lying between the skirts 11A, 11B and underneath the bottom 13 there is con- fined a volume of the loose mass which forms the seabed 2.
  • lowering or burying of the concrete element 1 takes place by introducing water into this space 16, for the purpose of fluidizing the loose masses therein so that these loose masses can be removed in a fluidized or water-mixed condition.
  • nozzle devices in the space 16 for example in the form of jet tubes and nozzles 14 which, through supply tubes, are connected to water pump equipment 15 which can for exam ⁇ ple be common to a number of concrete elements 1 at a given construction site.
  • each side wall 1A,B there are shown supporting plates 4A and 4B which have a specific function in connection with the burying of the element to the desired depth, which is to be explained further below.
  • the mouth 17C of which is open towards the space 16 there is, moreover, provided at least one suc ⁇ tion tube 17, the mouth 17C of which is open towards the space 16.
  • the mouth 17C is located at a corner region between the bottom 13 and the skirt llB. Such a position of the suction mouth 17C can be advantageous in many cases.
  • the suction tube 17 leads to pump equipment being suited for pumping out the above mentioned mixture of water and loose mass, for example sand, from the space 16.
  • the water tubes and nozzles 14 for fluidizing these loose masses can with advantage be located internally on the two skirts 11A, B, preferrably also with somewhat downwardly directed nozzles 14A and 14B at the lower edges of the skirts. In the starting position shown in fig. 1 before lowering or burying by means of jet effect, the pipline 3 is placed or pulled into the channel element.
  • the pipeline is placed in the channel elements only when a series of these elements of a required number has been low ⁇ ered to the desired level underneath the seabed, so as to ⁇ gether to form a smooth guiding channel for a pipeline.
  • each channel or concrete element 1 is lowered by injecting water through the nozzles 14 and 14A, B. At the same time suction from the mouth 17C is initiated through suction tube 17. As loose masses are by and by removed from space 16 element l will sink down into the seabed 2, and this takes place in a cont ⁇ rolled manner depending upon the amount of water supplied and the pumping out power. This can be adjusted by means of a suitable control unit which as the case may be, can be common to a series of channel elements in a given installation.
  • the supporting plates 4A, B are deta- chably mounted in slits 19A, B in the respective side walls 1A, B.
  • the burying therefore can proceed until a depth, for example as indicated as sea bottom at 2', whereby the height difference between the two seabed levels 2 and 2 ' in fig.2, will be for example more than 1 meter.
  • the supporting plates 12A, B and the attachment 19A, B there ⁇ of in side walls 1A, B must be sufficiently strong for the structure to resist the exterior pressure of the loose masses of the seabed when the burying has proceeded to a depth corresponding to the sea bottom level 2' in fig. 2, or in other words to the maximum burying depth.
  • the supporting plates 4A, B are then pulled up from the elements 1.
  • the supporting plates preferrably are provided with attatchment means 5A, 5B at their upper portions, for example in the form of suitable openings for a crane hook.
  • Fig. 3 shows a number of channel elements 21-27, for example of concrete, as described with reference to figs.l and 2, in a finished installation with a pipeline 3 being extended inwards from the depth under the sea 20 to dry land.
  • the sea bottom is indicated at 2', corresponding to the final level 2' in fig. 2.
  • connection means 31, 32 which can consist of cooperating and complementary parts at the respec ⁇ tive ends of the channel elements.
  • connection means can be adapted to make the interconnection somewhat flexible and shall serve to guide and align adjacent channel elements in relation to each other.
  • a mobile equipment carriage 40 which can contain, inter alia, the above mentioned control unit for controlling the burying of the individual elements 21-27, whereby water supply con ⁇ duits and suction tubes for the elements can be extended to the unit 40, as schematically indicated for the two elements 26 and 27.
  • Unit 40 can also comprise the above mentioned water pump equipment 15. As in the case of a crane as men- tioned above, the unit can be run on rails (not shown) , mounted on the elements 21-27.
  • the channel cross-section can be approximately U-shaped or possibly can be of a triangular shape, so that a more or less pointed bottom part projects downwards centrally in the space 16 between the skirts. In any case it is significant that the mutual spacing between the two skirts substantially corresponds to the maximum width of the overlying channel.
  • channel element must not necessarily be made of reinforced concrete, but can for example in similarity to the skirts also be made as a steel structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Civil Engineering (AREA)
  • Public Health (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Revetment (AREA)
  • Pipeline Systems (AREA)
  • Paper (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Elément de canalisation et procédé servant à poser des pipelines souterrains, afin d'amener vers la terre ferme, par exemple, du gaz et/ou du pétrole dans des régions où le fond de la mer (2) est constitué par des masses mouvantes telles que du sable, en particulier dans des plages et des régions marécageuses. Cet élément de canalisation (1) comprend une section transversale ouverte vers le haut et comportant des parois latérales (1A, 1B) ainsi qu'un fond, dont l'intérieur est conçu pour supporter un ou plusieurs pipelines (3). Une jupe sous forme de plaque (11A, 11B) se trouve le long de chaque côté de l'élément de canalisation (1) et se prolonge au-dessous du fond (13) dudit élément sensiblement dans l'alignement de chaque paroi latérale respective (1A, 1B). Dans l'espace (16) situé entre les jupes (11A, 11B) au-dessous du fond (13), se trouvent des buses (14, 14A, 14B) servant à introduire de l'eau et à fluidifier les masses mouvantes situées dans l'espace (16). De plus, au moins un tube d'aspiration (17) est branché sur une pompe extérieure et s'ouvre dans l'espace (16) par son extrémité (17C), afin d'aspirer les masses mouvantes fluidifiées hors dudit espace.
PCT/NO1992/000094 1991-05-24 1992-05-19 Element de canalisation et procede de pose de pipelines sous terre WO1992020947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO912018A NO174860C (no) 1991-05-24 1991-05-24 Kanal-element og fremgangsmåte for nedgraving av rörledninger
NO912018 1991-05-24

Publications (1)

Publication Number Publication Date
WO1992020947A1 true WO1992020947A1 (fr) 1992-11-26

Family

ID=19894167

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1992/000094 WO1992020947A1 (fr) 1991-05-24 1992-05-19 Element de canalisation et procede de pose de pipelines sous terre

Country Status (3)

Country Link
AU (1) AU1695692A (fr)
NO (1) NO174860C (fr)
WO (1) WO1992020947A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002255C2 (nl) * 1996-02-06 1997-08-07 Oranjewoud Ingb Bv Werkwijze voor het plaatsen van een leidingstelsel.
WO2001001028A2 (fr) * 1999-06-25 2001-01-04 J P Kenny Pty Limited Stabilisation de structures sous-marines allongees
AU764929B2 (en) * 1999-06-25 2003-09-04 J.P. Kenny Pty. Limited Stabilisation of submarine elongate structures

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1801994B2 (de) * 1968-10-09 1974-10-24 Horst-D. Dipl.-Ing. 2000 Hamburg Baser Vorrichtung zum Einbringen von Rohrleitungen in einen Gewässergrund
US4102145A (en) * 1976-06-03 1978-07-25 Shell Oil Company Anchoring a pipeline to the ground

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1801994B2 (de) * 1968-10-09 1974-10-24 Horst-D. Dipl.-Ing. 2000 Hamburg Baser Vorrichtung zum Einbringen von Rohrleitungen in einen Gewässergrund
US4102145A (en) * 1976-06-03 1978-07-25 Shell Oil Company Anchoring a pipeline to the ground

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002255C2 (nl) * 1996-02-06 1997-08-07 Oranjewoud Ingb Bv Werkwijze voor het plaatsen van een leidingstelsel.
EP0790451A1 (fr) * 1996-02-06 1997-08-20 Ingenieursbureau Oranjewoud B.V. Procédé pour poser un système de tuyaux
WO2001001028A2 (fr) * 1999-06-25 2001-01-04 J P Kenny Pty Limited Stabilisation de structures sous-marines allongees
WO2001001028A3 (fr) * 1999-06-25 2001-05-31 J P Kenny Pty Ltd Stabilisation de structures sous-marines allongees
AU764929B2 (en) * 1999-06-25 2003-09-04 J.P. Kenny Pty. Limited Stabilisation of submarine elongate structures
US7246971B1 (en) 1999-06-25 2007-07-24 J P Kenny Pty Limited Stabilisation of submarine elongate structures

Also Published As

Publication number Publication date
NO174860C (no) 1994-07-20
NO912018D0 (no) 1991-05-24
NO174860B (no) 1994-04-11
AU1695692A (en) 1992-12-30
NO912018L (no) 1992-11-25

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