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EP0213167A1 - Arrangement in boom structure - Google Patents

Arrangement in boom structure

Info

Publication number
EP0213167A1
EP0213167A1 EP19860901527 EP86901527A EP0213167A1 EP 0213167 A1 EP0213167 A1 EP 0213167A1 EP 19860901527 EP19860901527 EP 19860901527 EP 86901527 A EP86901527 A EP 86901527A EP 0213167 A1 EP0213167 A1 EP 0213167A1
Authority
EP
European Patent Office
Prior art keywords
pipe
pieces
floating means
skirt
boom
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19860901527
Other languages
German (de)
French (fr)
Inventor
Jan Monrad Tangen
Per Hartwig
Ole Fritjof Nyhammer
Svein Tore Rabben
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BENNEX SERVICES AS
Original Assignee
BENNEX SERVICES AS
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 BENNEX SERVICES AS filed Critical BENNEX SERVICES AS
Publication of EP0213167A1 publication Critical patent/EP0213167A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
    • E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
    • E02B15/08—Devices for reducing the polluted area with or without additional devices for removing the material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
    • E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
    • E02B15/08—Devices for reducing the polluted area with or without additional devices for removing the material
    • E02B15/0814—Devices for reducing the polluted area with or without additional devices for removing the material with underwater curtains

Definitions

  • the present invention relates to an arrangement in a boom structure, comprising a skirt of impervious fabric, elongated floating means in the form of at least one flexible pipe having relatively high stiffness in the axial direction, spacer means attached to the floating means and to the upper and lower edges of the skirt in order to hold the latter extended, and possibly ballasting means attached to the lower edge of the skirt in order to hold the latter generally vertically in the sea.
  • Boom structures of this type are often used to limit oil spill from a potential source of pollution, for instance a loading and unloading terminal for tankers.
  • the boom is held in standby condition in that it is lying submerged on the bottom in a ring around the potential source of pollution. Should for instance an oil spill occur, the boom is raised to the surface by filling the floating means with air.
  • the floating means may advantageously have a certain stiffness, at least in the axial direction.
  • floating means in the form of a long plastic pipe. It has the desired stiffness, but is concurrently sufficiently flexible in the vertical plane to be able to follow the wave move ⁇ ments most likely to occur.
  • the spacer means holding the skirt of the boom extended in the vertical direction and providing attach ⁇ ment for the floating means usually have consisted of stiff stays of metal or glass fiber reinforced plastic. Such stays have the disadvantage that they are prone to getting hooked into mooring ropes and the stabilizing net usually provided at the lower edge of the boom. This problem is often largest when the boom lies in standby condition on the bottom, where current and waves may cause movements in the boom. The stiffness of the stays may also contribute to damage to the boom fabric due to wave movements. If waves move in the longitudinal direction of the boom, the floating means will usually be able to follow these, the boom thus assuming a generally sinusoidal form in the vertical . plane.
  • the object of the present invention is to provide an improved boom structure of the type mentioned in the introductory paragraph.
  • the floating means are constituted by at least two pipes arranged alongside each other, and in that the spacer means are each constituted by two pipe pieces, preferably of plastic material, which are attached to the floating means on opposite sides of these, the central axes of the pipe pieces extending transversely of the longitudinal direction of the floating means.
  • spacers in the form of stays which can get hooked into the stabilizing net and mooring lines, so that the boom can stand movements while lying standby on the bottom.
  • Spacers in the form of pipe pieces of plastic material facilitates a certain mov- ability of the attachment points for the boom fabric in the longitudinal direction of the boom, so that the slack occuring in a wave through may be transferred to the con- c vex portion on the adjacent wave crest. Therefore, one has to a substantial degree reduced the danger of over ⁇ loading and damage to the boom fabric and spacers.
  • the pipe pieces constituting the spacers may be cut from commercially available pipe material, which contributes
  • the pieces of pipe are attached to the floating means by means of a lashing which has been run around the
  • the lashing may advantageously consist of a belt having a buckle, both preferably made from synthetic material.
  • the lashing may very quickly be brought in place and tightened to the desired degree, so that
  • the end surfaces of the pipe pieces may advantageously converge in the direction away from the floating means, e.g. so that the smallest axial dimension of the pipe pieces is about half of the largest axial Q dimension.
  • This tapering form in the direction away from the floating means contributes to the flexibility of the spacers in the longitudinal direction of the boom, while still leaving them with a relatively wide "foot" for resting against the floating means.
  • One will of course 5 also save material in the pipe pieces.
  • Fig. 2 shows the boom structure in section along the line II - II in Fig. 1,
  • Fig. 3 shows a partial view at a larger scale, 5 seen in the direction III - III in Fig. 1, and
  • Fig. 4 shows at a larger scale the partial view IV - IV in Fig. 1.
  • the boom structure shown in the drawings comprises a skirt 1, floating means 2, spacers 3 and a stabilizing Q net 4.
  • the skirt may be constituted by an impervious fabric, e.g. PVC-coated polyamid.
  • the floating means 2 are constituted by two adjacent pipes of PEHD.
  • the spacers 3 are constituted by pipe pieces, which are cut from a pipe which may also be made from PEHD.
  • the pipe 5 pieces 3 are lashed in pairs to the floating means 2, one on either side, by means of a lashing 5, which advantageously may be constituted by a belt and buckle of synthetic material.
  • the spacers in the form of pipe pieces 3 have their central axes extending transversely of the longi ⁇ tudinal direction of the boom.
  • the pipe pieces 3 show a certain flexibility in the longitudinal direction of the boom, not only due to their own elasticity, but also because they to a limited extent
  • the skirt has about 15% excess length as compared to the distance between two consecutive pipe pieces 3 in order to reduce the possibility of over ⁇ loading the skirt during wave strains, as it best appears from Fig. 3.
  • the lower edge 8 of the skirt is attached
  • ballasting means in the form of lead weights 10 are attached in order to contribute to maintaining the verti ⁇ cal position of the boom in the sea.
  • the stabilizing net 4 is also attached to the rope 9 and contributes to
  • the stabilizing net is provided with a bottom rope 11, which i.a. is used as attachment for the moorings of the boom.
  • the invention is by no means restricted to this example, but may be varied in a number of ways within the scope of the following claims.
  • the ropes 7 and 9 at the edges of the skirt need not be run through holes in the spacers, but
  • 35 may instead be connected to the outside of these by means of a clamp attached by screws.
  • the ropes have to be run through eyelets in the skirt, but may instead be attached to the skirt by means of lashings or straps, suitably with buckles, so that the skirt may be assembled to the ropes in a simple and quick manner, preferably during launching of the boom at the place of use.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Cleaning Or Clearing Of The Surface Of Open Water (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Road Repair (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

Une structure de barrage comporte une jupe (1) en tissu imperméable, des moyens de flottaison (2) allongés en forme de tuyaux, et des organes d'écartement (3) fixés sur les moyens de flottaison (2) et sur les bords supérieurs et inférieurs (6, 8) de la jupe pour la maintenir tendue. Les moyens de flottaison (2) sont constitués par deux tuyaux adjacents en plastique réunis par des ligatures (5). Les organes d'écartement (3) sont constitués par des petits morceaux de tuyau (3), également en plastique, dont le sens axial est transversal par rapport au sens longitudinal du barrage. Les organes d'écartement (3) sont fixés sur les moyens de flottaison (2) à l'aide des mêmes ligatures (5) qui peuvent être constituées par des courroies munies de boucles. La structure porteuse du barrage constituée par les tuyaux (2) et les morceaux de tuyau (3) ligaturés lui confère une bonne stabilité latérale ainsi qu'une souplesse suffisante dans le plan vertical.A dam structure comprises a skirt (1) made of impermeable fabric, flotation means (2) elongated in the form of pipes, and spacers (3) fixed on the flotation means (2) and on the upper edges and lower (6, 8) of the skirt to keep it taut. The flotation means (2) consist of two adjacent plastic pipes joined by ligatures (5). The spacer members (3) consist of small pieces of pipe (3), also made of plastic, the axial direction of which is transverse to the longitudinal direction of the dam. The spacers (3) are fixed to the flotation means (2) using the same ties (5) which can be constituted by belts provided with loops. The supporting structure of the dam constituted by the pipes (2) and the pieces of pipe (3) ligated gives it good lateral stability as well as sufficient flexibility in the vertical plane.

Description

Arrangement in boom structure
The present invention relates to an arrangement in a boom structure, comprising a skirt of impervious fabric, elongated floating means in the form of at least one flexible pipe having relatively high stiffness in the axial direction, spacer means attached to the floating means and to the upper and lower edges of the skirt in order to hold the latter extended, and possibly ballasting means attached to the lower edge of the skirt in order to hold the latter generally vertically in the sea.
Boom structures of this type are often used to limit oil spill from a potential source of pollution, for instance a loading and unloading terminal for tankers. The boom is held in standby condition in that it is lying submerged on the bottom in a ring around the potential source of pollution. Should for instance an oil spill occur, the boom is raised to the surface by filling the floating means with air.
In order for the boom to stay in place both in standby condition on the bottom and in floating position during use without the necessity of too many mooring points, the floating means may advantageously have a certain stiffness, at least in the axial direction. Thus, it has been found expedient to use floating means in the form of a long plastic pipe. It has the desired stiffness, but is concurrently sufficiently flexible in the vertical plane to be able to follow the wave move¬ ments most likely to occur.
The spacer means holding the skirt of the boom extended in the vertical direction and providing attach¬ ment for the floating means, usually have consisted of stiff stays of metal or glass fiber reinforced plastic. Such stays have the disadvantage that they are prone to getting hooked into mooring ropes and the stabilizing net usually provided at the lower edge of the boom. This problem is often largest when the boom lies in standby condition on the bottom, where current and waves may cause movements in the boom. The stiffness of the stays may also contribute to damage to the boom fabric due to wave movements. If waves move in the longitudinal direction of the boom, the floating means will usually be able to follow these, the boom thus assuming a generally sinusoidal form in the vertical . plane. In the wave troughs, where the top of the boom will be upwardly concave, slack occurs in the boom fabric and top rope. On the wave crests, however, the boom will assume a convex form, but since the floating means, due to their axial stiffness, will tend to maintain their length, the upper edge of the boom may be stretched beyond its nominal length. During such circumstances one has found both that the boom fabric has been torn and that the stays have been broken or bent.
Further deficiencies in previously known booms of this type are that they have been cumbersome to assemble and have shown low stability during sideways influence from wind and current.
The object of the present invention is to provide an improved boom structure of the type mentioned in the introductory paragraph.
According to the invention this is obtained in that the floating means are constituted by at least two pipes arranged alongside each other, and in that the spacer means are each constituted by two pipe pieces, preferably of plastic material, which are attached to the floating means on opposite sides of these, the central axes of the pipe pieces extending transversely of the longitudinal direction of the floating means.
Thus, one has avoided spacers in the form of stays which can get hooked into the stabilizing net and mooring lines, so that the boom can stand movements while lying standby on the bottom. Spacers in the form of pipe pieces of plastic material facilitates a certain mov- ability of the attachment points for the boom fabric in the longitudinal direction of the boom, so that the slack occuring in a wave through may be transferred to the con- c vex portion on the adjacent wave crest. Therefore, one has to a substantial degree reduced the danger of over¬ loading and damage to the boom fabric and spacers. The pipe pieces constituting the spacers may be cut from commercially available pipe material, which contributes
IQ to making the entire boom structure simple and inexpen¬ sive.
According to an advantageous feature of the inven¬ tion, the pieces of pipe are attached to the floating means by means of a lashing which has been run around the
|c floating means and through the pipe pieces. This contri¬ butes to the flexibility of the pipe pieces in the longi¬ tudinal direction of the boom, so that this may more easily adapt to wave movements without overloading. The lashings also constitute a very simple means for holding n the two pipes constituting the floating means in place but, nevertheless, permit a certain relative axial move¬ ment between the pipes if these, due to production tole¬ rances in the material properties or for other reasons, should change differently when they are subjected to
25 environmental effects.
The lashing may advantageously consist of a belt having a buckle, both preferably made from synthetic material. Thus, the lashing may very quickly be brought in place and tightened to the desired degree, so that
30 assembling the boom may take place in a simple manner at the place of use, which is often necessary due to the relatively great length of the pipes constituting the floating means.
Furthermore, according to the invention it is
35 suggested to make the largest axial dimension of the pipe pieces somewhat larger than the diameter of the floating means. Thus, the pipe pieces will rest steadily against the two pipes constituting the floating means and form a relatively stable structure, making the lateral stability of the boom very good. In other words, the boom will not have a tendency to lie flat in the sea when subjected to c strong wind or current.
The end surfaces of the pipe pieces may advantageously converge in the direction away from the floating means, e.g. so that the smallest axial dimension of the pipe pieces is about half of the largest axial Q dimension. This tapering form in the direction away from the floating means contributes to the flexibility of the spacers in the longitudinal direction of the boom, while still leaving them with a relatively wide "foot" for resting against the floating means. One will of course 5 also save material in the pipe pieces.
In order for improved understanding of the inven¬ tion, it shall be explained more closely with reference to the exemplifying embodiment shown in the accompanying drawings, in which Q Fig. 1 shows a side view of a boom structure according to the invention.
Fig. 2 shows the boom structure in section along the line II - II in Fig. 1,
Fig. 3 shows a partial view at a larger scale, 5 seen in the direction III - III in Fig. 1, and
Fig. 4 shows at a larger scale the partial view IV - IV in Fig. 1.
The boom structure shown in the drawings comprises a skirt 1, floating means 2, spacers 3 and a stabilizing Q net 4. The skirt may be constituted by an impervious fabric, e.g. PVC-coated polyamid. The floating means 2 are constituted by two adjacent pipes of PEHD. The spacers 3 are constituted by pipe pieces, which are cut from a pipe which may also be made from PEHD. The pipe 5 pieces 3 are lashed in pairs to the floating means 2, one on either side, by means of a lashing 5, which advantageously may be constituted by a belt and buckle of synthetic material. The spacers in the form of pipe pieces 3 have their central axes extending transversely of the longi¬ tudinal direction of the boom. They have their largest 5 axial dimension in the part resting against the floating means 2 and taper off in the direction away therefrom. The pipe pieces 3 show a certain flexibility in the longitudinal direction of the boom, not only due to their own elasticity, but also because they to a limited extent
•JO may roll along the floating means 2, provided that the belts 5 are not too rigid and tight.
Along the upper edge 6 of the skirt 1 a rope 7 is run through eyelets, the rope also being run through two holes in the top of the pipe pieces 3 in order to attach
15 the skirt thereto. The skirt has about 15% excess length as compared to the distance between two consecutive pipe pieces 3 in order to reduce the possibility of over¬ loading the skirt during wave strains, as it best appears from Fig. 3. The lower edge 8 of the skirt is attached
20 in a similar manner by means of a rope 9, and here also ballasting means in the form of lead weights 10 are attached in order to contribute to maintaining the verti¬ cal position of the boom in the sea. The stabilizing net 4 is also attached to the rope 9 and contributes to
25 stabilizing the boom in the sea. At the bottom the stabilizing net is provided with a bottom rope 11, which i.a. is used as attachment for the moorings of the boom.
Even though the boom structure according to the invention is described above with respect to a certain
30 exemplifying embodiment, the invention is by no means restricted to this example, but may be varied in a number of ways within the scope of the following claims. Thus, as an example, the ropes 7 and 9 at the edges of the skirt need not be run through holes in the spacers, but
35 may instead be connected to the outside of these by means of a clamp attached by screws. Nor do the ropes have to be run through eyelets in the skirt, but may instead be attached to the skirt by means of lashings or straps, suitably with buckles, so that the skirt may be assembled to the ropes in a simple and quick manner, preferably during launching of the boom at the place of use.

Claims

C l a i m s
1. Arrangement in a boom structure, comprising a skirt (1) of impervious material, elongated floating means (2) in the form of at least two adjacent, bendable pipes having relatively high stiffness in the axial direction, spacer means (3) attached to the floating means and to the upper and lower edges (6, 8) of the skirt in order to hold the skirt extended, and possibly ballasting means (10) attached at the lower edge (8) of the skirt in order to hold it generally vertically in the sea, c h a r a c t e r i z e d in that the spacers are constituted by two pieces of pipe (3), preferably of plastic material, which are attached to the floating means (2) on opposite sides of these, the central axes of the pieces of pipe (3) extending transversely of the longitudinal direction of the floating means (2).
2. Arrangement according to claim 1, c h a r a c t e r i z e d in that the pieces of pipe (3) are attached to the floating means (2) by means of a lashing (5) which is run around the floating means (2) and through the pieces of pipe (3).
3. Arrangement according to claim 2, c h a r a c t e r i z e d in that the lashing (5) con¬ sists of a belt with a buckle.
4. Arrangement according to any one of the preceding claims, c h a r a c t e r i z e d in that the largest axial dimension of the pieces of pipe (3) is larger than the diameter of the floating means (2).
5. Arrangement according to any one of the preceding claims, c h a r a c t e r i s e d in that the end surfaces of the pieces of pipe (3) converge in the direc¬ tion away from the floating means (2).
6. Arrangement according to claim 5, c h a r a c t e r i z e d in that the smallest axial dimension of the pieces of pipe (3) is about half of c their largest axial dimension.
0
5
0
5
0
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EP19860901527 1985-02-22 1986-02-20 Arrangement in boom structure Withdrawn EP0213167A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO850738 1985-02-22
NO850738A NO156297C (en) 1985-02-22 1985-02-22 LENS CONSTRUCTION DEVICE.

Publications (1)

Publication Number Publication Date
EP0213167A1 true EP0213167A1 (en) 1987-03-11

Family

ID=19888140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860901527 Withdrawn EP0213167A1 (en) 1985-02-22 1986-02-20 Arrangement in boom structure

Country Status (3)

Country Link
EP (1) EP0213167A1 (en)
NO (1) NO156297C (en)
WO (1) WO1986004942A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071286A (en) * 1989-11-13 1991-12-10 Separovich Robert A Floating boom for confining waterborne contaminates
GB9115948D0 (en) * 1991-07-24 1991-09-11 Carr Rupert E Marine boom
GR1004864B (en) * 2000-11-23 2005-04-13 Φραγκισκος Κωνσταντινου Μαστροπαυλος Floating barrier for pollution prevention incorporating a net and a filter or a net without filter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751925A (en) * 1970-10-07 1973-08-14 Merritt Division Of Murphy Pac Floating oil containment boom
JPS506743B1 (en) * 1971-03-13 1975-03-17
FR2289682A1 (en) * 1974-10-29 1976-05-28 Rhin Et Rhone Sa DAM TO COMBAT WATER POLLUTION BY HYDROCARBONS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8604942A1 *

Also Published As

Publication number Publication date
WO1986004942A1 (en) 1986-08-28
NO156297B (en) 1987-05-18
NO850738L (en) 1986-08-25
NO156297C (en) 1987-08-26

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Inventor name: HARTWIG, PER

Inventor name: NYHAMMER, OLE, FRITJOF

Inventor name: RABBEN, SVEIN, TORE

Inventor name: TANGEN, JAN MONRAD