GB1575308A - Trunking for tubes pipes and electrical cable - Google Patents
Trunking for tubes pipes and electrical cable Download PDFInfo
- Publication number
- GB1575308A GB1575308A GB2058076A GB2058076A GB1575308A GB 1575308 A GB1575308 A GB 1575308A GB 2058076 A GB2058076 A GB 2058076A GB 2058076 A GB2058076 A GB 2058076A GB 1575308 A GB1575308 A GB 1575308A
- Authority
- GB
- United Kingdom
- Prior art keywords
- trunking
- members
- article
- series
- intumescent
- 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.)
- Expired
Links
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
- F16L7/00—Supporting of pipes or cables inside other pipes or sleeves, e.g. for enabling pipes or cables to be inserted or withdrawn from under roads or railways without interruption of traffic
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/04—Protection of pipes or objects of similar shape against external or internal damage or wear against fire or other external sources of extreme heat
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/20—Metal tubes, e.g. lead sheaths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
- H02G3/0412—Heat or fire protective means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Details Of Indoor Wiring (AREA)
- Installation Of Indoor Wiring (AREA)
Description
(54) TRUNKING FOR TUBES, PIPES AND ELECTRJCAL CABLE
(71) We, ADVANCED FIREPROOFING SYSTEMS LIMITED, of P.O. Box 62, 11/12 Anne Road, Smethwick, Warley, West Midlands, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to protective trunking for narrow elongate articles such as electric cables, tubes and pipes.
The present invention consists in protective trunking for a narrow elongate article comprising at least one tubular structure surrounding and spaced apart from the article, the walls of said structure containing a plurality of perforations for ventilation, the structure being coated with or formed from an intumescent fire resistant composition.
Intumescent coatings generally comprise a resin and a spumific agent and swell to form a heat resistant char when exposed to fire. The intumescent compositions used in connection with the present invention preferably consist of an epoxy resin, melamine phosphate as the spumific agent in a weight ratio of less than 7.5 : 1 and a curing agent for the epoxy resin together with additives and fillers as required. Desirably the composition also includes from 1 to 15% by weight, based on the weight of the other components in the compositions, of inorganic fibres, preferably ceramic fibres. Such compositions are described in our copending application for letters patent No. 9928/76. (Serial No 1570604).
In an alternative form the intumescent composition may include up to 15% by weight of crushed glass particles.
In those embodiments of the invention in which the tubular structure is coated with an intumescent composition, the latter is applied to the uncured state but in the presence of a curing agent such that curing takes place after application to the structure. In those embodiments in which the structure consists entirely of an intumescent material, the uncured composition, containing the curing agent, is poured into a mould of appropriate shape and cured therein.
The structure of the present invention is especially suitable for providing a protective cover for electric cables. In addition to fire protection it also provides protection for the article located within the structure against damage by physical knocks and may also be employed to support the article.
In the event of fire external to the trunking the intumescent composition of the structure expands and chars and closes off the apertures to form a shield. In the event that fire is generated within the article, for example in an electrical cable, the intumescent composition again expands and chars to close off the apertures thus restraining the fire from spreading and also assisting in extinguishing the fire by restricting the access of oxygen thereto.
The structure may be made from metal or other suitable materials, such as plastics materials, coated with an intumescent composition or it may be formed entirely of an intumescent material.
The article is preferably supported within the structure by spacers arranged to maintain it away from the walls thereof in order that air may flow freely between the article and the said walls.
The coating of intumescent material is applied to the structure in a manner to avoid obstruction of the perforations therein.
In a preferred embodiment the structure comprises a discontinuous tube consisting of a plurality of annular members each having a circumferential wall and two annular end faces, which are normally in contact with the corresponding faces of adjacent members, each said member containing two or more slots in the wall thereof.
For convenience the slots may communicate with an end face of each member.
Preferably the individual members are divided across a diameter for ease of assembly around the article to be protected.
It is also preferred that the members are formed solely of an intumescent composition.
Spacers, for locating the structure around the article or around an inner structure, may be in the form, for example; of corrugated strips of metal inserted between the inner walls of the structure and the elongate article, or may be in the form of spacer projections integral with the inside walls of the structure.
It is preferred that at least two concentric structures are employed to provide protection for the article.
When the structure is in the form of a plurality of annular members the second and successive series of outer members preferably contain, in addition to spacer projections, lugs which co-operate with the slots formed in the walls of the next inner member to prevent relative axial movement of the two series of members.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a perspective view of part of an electrical cable trunking according to the present invention prior to coating with an intumescent composition,
Figure 2 is a perspective view of the same trunking as Figure 1 after coating with intumescent compositions,
Figure 3 is a cross sectional view of the trunking shown in Figure 2,
Figure 4 is a perspective view of part of the embodiment shown in Figures 2 and 3,
Figure 5 is a perspective view of a preferred embodiment of the present invention used as an electrical cable trunking,
Figure 6 is an end view of one part of the embodiment of Figure 5,
Figure 7 is an end view of another part of the embodiment of Figure 5.
The embodiment of Figures 1 to 4 consists of an electric cable trunking in the form of a tube 10 surrounding an electrical cable 11. The tube 10 is formed from a sheet of "expanded metal", thus being of perforate construction providing a plurality of holes 12 for ventilation, the holes being defined between the inter-connected bars 13 of the wall of the tube. In
Figure 2 the trunking is shown after being coated with an intumescent composition, such as that sold under the Trade Mark FIREC by Advanced Fireproofing Systems Limited of
Warley, West Midlands. The intumescent composition is seen to have enveloped the inter-connected bars 13 of the wall of the structure 10, but has not closed the apertures 12 thus allowing adequate ventilation for the cable 11. The electrical cable 11 is supported away from the walls of the structure by means of spacers 14, thus permitting air to flow freely between the cables and the walls thereof. Each spacer 14, illustrated in Figure 4, is formed from a corrugated strip of metal which is inserted between the cable and the walls of the structure as shown in Figure 3.
It is preferred that a second concentric structure surrounding and supported away from the inner structure 10 by further spacers 14, be provided to give additional protection.
Further protection can be obtained by the provision of additional concentric structures.
For ease of assembly each structure e.g. structure 10, may be formed in two parts divided longitudinally along the plane contained in the axis of the structure.
The structures illustrated in Figures 1 and 2 are provided in convenient lengths for ease of assembly. Two or more elongated articles, such as cables or pipes, can be located in each structure.
In a preferred embodiment of the invention as illustrated in Figures 5, 6 and 7 an electrical cable trunking is formed from a first series of annular members 20 surrounding an electrical cable 21. Each member 20 has a circumferential wall 22, a plane end face 23 and a second end face (not shown). Slots 24 are formed in the wall 22 and communicate with the second end face to give the said face a castallated appearance. The cable is retained substantially concentrically within the annular members by spacer projections 25 depending from the inside walls 22. Each member is located in contact with adjacent members, the plane face 23 of one member being in contact with the castallared face of an adjacent member. A second series of annular members 30, having substantially the same structure as the first series are located concentrically around the outside of the first series 20. The members are maintained apart from the first series 20 by spacer projections 31. in addition locating lugs 32 interlock with slots 24 of annular members 20 to prevent relative axial movement between the two series of members.
The structures described with reference to Figures 5, 6 and 7 have the advantage that they enable an electrical cable, for example. to retain flexibility and thus allow it to be reeled.
The structures also permit an electrical cable to "snake".
Both the series of members are formed in two halves for ease of assembly and are joined by an adhesive.
The annular members may be formed from an intumescent composition containing the following components in part by weight as shown:
Epoxy resin (Araldite l MY 753) 35
Melamine Phosphate 40
Ceramic Fibre (Fiberfrux 2 chipped film) 8
Curing agent (Versamide 3 V125) 15
Accelerator (DYO 4 63) 2
Gelling agent (Bentone 5 27) 2
Filler (Cristobolite) 2
An alternate composition may consist of:
Epoxy resin (Araldite 1 MY 753) 35
Melammine Phosphate 30
Curing agent (Versamide 3 V125) 15
Accelerator (DYO 634) 2
Gelling agent (Bentane 275) 2
Filler (Cristobolite) 2
Crushed glass particles 10
1. Registered Trade Mark of Ciba Limited.
2. Registered Trade Mark of Carborumdum Co.
3. Registered Trade Mark of Cray Valley Products.
4. Sold by Ciba Limited.
5. Registered Trade Mark of Berk Limited.
The uncured material being poured into moulds and then allowed to cure, to a solid hardenable state.
The members may alternatively, be formed from a metal or other suitable material which is subsequently coated with the intumescent composition. The coating may take place before or after assembly of the members around the cable or other article. Where two concentric series of members are employed the first series should, however, be coated prior to assembling the second series of members concentrically thereabout.
Whilst the structures disclosed in the accompanying drawings are of an essentially circular cross section, structures of other cross sections, for example rectangular, may be employed.
WHAT WE CLAIM IS:
1. A protective trunking for a narrow elongate article comprising at least one tubular structure surrounding and spaced apart from the article, the walls of said structure containing a plurality of perforations for ventilation, the structure being coated with or formed from a fire resistant intumescent composition.
2. A trunking as claimed in claim 1 wherein the fire resistant intumescent composition comprises an epoxy resin and melamine phosphate in a weight ratio of less than 7.5 to 1, and a curing agent for the epoxy resin.
3. A trunking as claimed in claim 2 wherein the intumescent composition includes from 1 to 15% by weight, based on the weight of the other components of the composition, of inorganic fibres,.
4. A trunking as claimed in claim 3 wherein the inorganic fibres are ceramic fibres.
5. A trunking according to claim 2 wherein the intumescent composition includes up to 15% by weight of crushed glass particles.
6. A trunking as claimed in any one of claims 1 to 5 wherein the structure is formed from expanded metal.
7. A trunking according to claim 6 wherein the structure is formed in two parts divided longitudinally along the plane contained in the axis of the structure.
8. A trunking according to any one of claims 1 to 7 wherein the structure is spaced apart from the article by means of spacers, consisting of corrugated strips of metal inserted between the inner walls of the structure and the article.
9. A trunking as claimed in any one of claims 6, 7 or 8 wherein the article is surrounded by at least two concentric structures in spaced apart relationship.
10. A trunking according to any one of claim l or claim 5 wherein the structure comprises a tube consisting of a plurality of discrete narrow annular members each having a circumferential wall and two annular end faces, which end faces are normally in contact
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (18)
1. A protective trunking for a narrow elongate article comprising at least one tubular structure surrounding and spaced apart from the article, the walls of said structure containing a plurality of perforations for ventilation, the structure being coated with or formed from a fire resistant intumescent composition.
2. A trunking as claimed in claim 1 wherein the fire resistant intumescent composition comprises an epoxy resin and melamine phosphate in a weight ratio of less than 7.5 to 1, and a curing agent for the epoxy resin.
3. A trunking as claimed in claim 2 wherein the intumescent composition includes from 1 to 15% by weight, based on the weight of the other components of the composition, of inorganic fibres,.
4. A trunking as claimed in claim 3 wherein the inorganic fibres are ceramic fibres.
5. A trunking according to claim 2 wherein the intumescent composition includes up to 15% by weight of crushed glass particles.
6. A trunking as claimed in any one of claims 1 to 5 wherein the structure is formed from expanded metal.
7. A trunking according to claim 6 wherein the structure is formed in two parts divided longitudinally along the plane contained in the axis of the structure.
8. A trunking according to any one of claims 1 to 7 wherein the structure is spaced apart from the article by means of spacers, consisting of corrugated strips of metal inserted between the inner walls of the structure and the article.
9. A trunking as claimed in any one of claims 6, 7 or 8 wherein the article is surrounded by at least two concentric structures in spaced apart relationship.
10. A trunking according to any one of claim l or claim 5 wherein the structure comprises a tube consisting of a plurality of discrete narrow annular members each having a circumferential wall and two annular end faces, which end faces are normally in contact
with the corresponding faces of adjacent members, each said member containing two or more slots in the wall thereof.
11. A trunking as claimed in claim 10 wherein the slots communicate with an end face of the member containing them.
12. A trunking as claimed in claim 10 or claim 11 wherein each member is divided across a diameter for ease of assembly around the article.
13. A trunking as claimed in any one of claims 7 to 9 wherein the structure consists solely of an intumescent material.
14. A trunking according to any one of claims 10 to 13 wherein the members are spaced apart from the article by means of projections integral with the inside walls of the structure.
15. A trunking according to any one claims 10 to 14 wherein the article is surrounded by at least two concentric structures, each comprising a series of annular members.
16. A trunking according to claim 15 wherein the second and subsequent series of annular members contains lugs integral with the inside walls thereof which co-operate with the slots in the walls of the next inner series of members.
17. A trunking according to claim 1 substantially as hereinbefore described with reference to Figures 1 to 4 of the drawings.
18. A trunking according to claim 1 substantially as hereinbefore described with reference to Figures 5 to 7 of the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2058076A GB1575308A (en) | 1977-07-21 | 1977-07-21 | Trunking for tubes pipes and electrical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2058076A GB1575308A (en) | 1977-07-21 | 1977-07-21 | Trunking for tubes pipes and electrical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1575308A true GB1575308A (en) | 1980-09-17 |
Family
ID=10148268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2058076A Expired GB1575308A (en) | 1977-07-21 | 1977-07-21 | Trunking for tubes pipes and electrical cable |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1575308A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0090635A2 (en) * | 1982-03-30 | 1983-10-05 | Dunlop Limited | Flexible hose incorporating a fire barrier |
| EP0108296A1 (en) * | 1982-11-04 | 1984-05-16 | Siemens Aktiengesellschaft | Flame-proof housing for cable junctions in telecommunication and power transmission |
| US4467577A (en) * | 1980-05-29 | 1984-08-28 | Minnesota Mining And Manufacturing Company | Intumescent fire barrier material laminated with restraining layer |
| GB2186123A (en) * | 1986-02-03 | 1987-08-05 | Norsk Kabelfabrik As | Cable ladder |
| WO1993022814A1 (en) * | 1992-04-27 | 1993-11-11 | B & K Southern Ltd | Trunking and a venting arrangement for fire protection structure |
| GB2311235A (en) * | 1996-03-19 | 1997-09-24 | David John Catt | Flexible fire protection wrap for cable trays and cable ladder racks |
| DE19948007A1 (en) * | 1999-10-06 | 2001-05-23 | Hans Skodock Gmbh | Linkage for corrugated pipe and associated fitting enhances degree of fire protection in building installations using tourniquet ring placed between inner cylinder section and corrugated pipe |
| WO2008035976A1 (en) * | 2006-09-20 | 2008-03-27 | Dalseide & Fløysand Group As | Means for fire protection of pipes, pipe joints, flanges, valves, insulation and steel constructions |
| CN106573711A (en) * | 2014-06-02 | 2017-04-19 | 路易斯·亚历汉德罗·阿玛托·马丁内兹·加扎 | Plastic cap design for protecting connectors, adaptable to different sizes |
| EP3409990A1 (en) * | 2017-05-31 | 2018-12-05 | HILTI Aktiengesellschaft | Flame retardant element and flame retardant bandage |
| CH715080A1 (en) * | 2018-06-11 | 2019-12-13 | Aborra Ag | Cable protective guide. |
-
1977
- 1977-07-21 GB GB2058076A patent/GB1575308A/en not_active Expired
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467577A (en) * | 1980-05-29 | 1984-08-28 | Minnesota Mining And Manufacturing Company | Intumescent fire barrier material laminated with restraining layer |
| EP0090635A2 (en) * | 1982-03-30 | 1983-10-05 | Dunlop Limited | Flexible hose incorporating a fire barrier |
| FR2524605A1 (en) * | 1982-03-30 | 1983-10-07 | Dunlop Ltd | FLEXIBLE PROTECTIVE ELEMENTS AGAINST FIRE, AND OBJECTS COMPRISING SAME, IN PARTICULAR FLEXIBLE PIPING |
| EP0090635A3 (en) * | 1982-03-30 | 1984-07-11 | Dunlop Limited | Flexible hose incorporating a fire barrier |
| US4509559A (en) * | 1982-03-30 | 1985-04-09 | Dunlop Limited | Fire-barriers |
| EP0108296A1 (en) * | 1982-11-04 | 1984-05-16 | Siemens Aktiengesellschaft | Flame-proof housing for cable junctions in telecommunication and power transmission |
| GB2186123A (en) * | 1986-02-03 | 1987-08-05 | Norsk Kabelfabrik As | Cable ladder |
| WO1993022814A1 (en) * | 1992-04-27 | 1993-11-11 | B & K Southern Ltd | Trunking and a venting arrangement for fire protection structure |
| GB2311235A (en) * | 1996-03-19 | 1997-09-24 | David John Catt | Flexible fire protection wrap for cable trays and cable ladder racks |
| DE19948007A1 (en) * | 1999-10-06 | 2001-05-23 | Hans Skodock Gmbh | Linkage for corrugated pipe and associated fitting enhances degree of fire protection in building installations using tourniquet ring placed between inner cylinder section and corrugated pipe |
| WO2008035976A1 (en) * | 2006-09-20 | 2008-03-27 | Dalseide & Fløysand Group As | Means for fire protection of pipes, pipe joints, flanges, valves, insulation and steel constructions |
| CN106573711A (en) * | 2014-06-02 | 2017-04-19 | 路易斯·亚历汉德罗·阿玛托·马丁内兹·加扎 | Plastic cap design for protecting connectors, adaptable to different sizes |
| EP3409990A1 (en) * | 2017-05-31 | 2018-12-05 | HILTI Aktiengesellschaft | Flame retardant element and flame retardant bandage |
| WO2018219730A1 (en) * | 2017-05-31 | 2018-12-06 | Hilti Aktiengesellschaft | Fire protection element and fire protection wrap |
| US11191982B2 (en) | 2017-05-31 | 2021-12-07 | Hilti Aktiengesellschaft | Fire-protection element and fire-protection wrap |
| CH715080A1 (en) * | 2018-06-11 | 2019-12-13 | Aborra Ag | Cable protective guide. |
| EP3582349A1 (en) * | 2018-06-11 | 2019-12-18 | Aborra AG | Cable protection guide |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920721 |