EP0907807B1 - Improved power transmission support structures - Google Patents
Improved power transmission support structures Download PDFInfo
- Publication number
- EP0907807B1 EP0907807B1 EP97930177A EP97930177A EP0907807B1 EP 0907807 B1 EP0907807 B1 EP 0907807B1 EP 97930177 A EP97930177 A EP 97930177A EP 97930177 A EP97930177 A EP 97930177A EP 0907807 B1 EP0907807 B1 EP 0907807B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support structure
- engaging
- pole
- transmission line
- securing
- 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 - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/22—Sockets or holders for poles or posts
- E04H12/2253—Mounting poles or posts to the holder
- E04H12/2261—Mounting poles or posts to the holder on a flat base
Definitions
- This invention relates to the art of structures for supporting high tension power transmission lines and high tension substation structures.
- Known structures for supporting high tension power transmission lines present several problems.
- Some support structures are made of wood, but these structures are usually small and expensive to maintain. Larger poles are typically made of steel, and these are conductive and present the problem of induction and the risk of a short to ground. Similar problems exist throughout the high tension infrastructure, for example, in the structures used in substations.
- plastic materials that are not inductive. These structures have not been successful because such structures having adequate strength are quite expensive. Further, plastic towers are flexible, which makes them vulnerable to excessive vibration in windy conditions. These vibrations are transmitted to the power lines causing them to break and resulting in often serious damage. Another drawback to the use of plastics is that they degrade significantly in the harsh environment to which the structures are exposed, particularly UV-radiation from the sun.
- US-A-4088808 discloses shaped articles, including hollow utility poles of hydraulic cement compositions reinforced with fiber glass fabric or with chopped fiber glass, and having a smooth, reflective surface, produced by the admixture of "super" water reducers to the aqueous cementitious slurries followed by casting or spraying into synthetic polymer molds, or molds coated with such synthetic polymers which are water repellent and non-sticking to hydraulic cements, to yield cured articles of high flexural strength with at least one surface which is an exact reproduction of the surface of the synthetic polymer mold, such as high gloss and patterned design.
- the present invention is directed to apparatus having the construction set out in the accompanying claim 1. Preferred features are set out in the subclaims 2 to 10.
- the high tension support poles are made of a composite material having physical and chemical properties that make it ideal for this purpose.
- the material is a composite made of an inorganic cement and inductively transparent glass fibers. This material is preferably that disclosed in United States patent 4,921,222 (Mott).
- the composite material utilized for the structures of the invention has a high strength-to-weight ratio and high torsional rigidity. It is also non-corroding in a variety of environmental conditions, and the exterior of this material may easily be sealed whereby there is no significant absorption of water. These properties allow the material to be used in harsh weather over extended periods of time. Electrically, the material is transparent to electromagnetic fields of the frequencies employed in high tension transmission and has high dielectric strength.
- the high tension power poles and other such structures made of the preferred composite material are inductively transparent, fewer expensive insulators are required to support a power line on the structure, and the poles may be smaller. Moreover, because of the physical properties of the material, the poles will have a very long life, which further reduces costs.
- the support structures in accordance with the invention are preferably manufactured in the form of poles by winding fiberglass under tension around a mandrel while supplying the inorganic cement, to form a fiberglass winding in an inorganic-cement matrix.
- Poles such as this may be made in a variety of shapes and sizes, depending on the number of transmission lines to be supported and the terrain.
- a support pole is a single, elongated element tapered from the bottom to the top having one or more cross pieces with insulators for engaging the transmission lines.
- the support structures may, however, be of other shapes, such as that of a tower having trusses constructed from individual pieces made of the inorganic cement composite material.
- the support structure When the support structure is in the shape of a pole, it may be attached to the ground in any of several ways.
- the bottom portion of the pole may simply planted in the ground.
- the pole is provided with a bottom flange for engaging a base structure, such as a concrete base that has been installed previously.
- the flange is attached to the pole is any of several ways.
- the cross pieces may be attached to the pole by any of several techniques.
- a tapered receptacle is formed in the composite material during manufacture and a cross piece made of the same composite material is held in the receptacle by grout, which is preferably expanding grout for ensuring a secure connection.
- An object of this invention is to provide an inductively transparent structure for supporting high tension transmission lines.
- Another object of this invention is to provide a support structure for high tension transmission lines that is inexpensive and yet highly resistant to environmental conditions.
- Yet another object of this invention is to provide a support structure for high tension transmission lines that has superior physical strength.
- Figure 1 illustrates an embodiment of the invention wherein an apparatus 2 for supporting high-tension power lines comprises a support structure 4 and line securing elements 6 made of inductively transparent, substantially continuous glass fibers and inorganic cements, such as those described in the aforementioned Mott patent.
- the support structure shown in figure 1 is in the shape of a tapered pole and is supported in the ground by placing a lower end of the pole in a hole in the ground.
- the pole illustrated in figure 1 may be made by winding glass fibers under tension about a tapered mandrel while supplying the inorganic cement. The mandrel is then withdrawn after the composite material has cured and the line-securing elements are added.
- Figures 2 and 3 illustrate one method for attaching the line-securing elements to the support structure.
- the line securing element 6 comprises a cross beam 8 that supports an insulator 10, the transmission line itself (not illustrated) being attached to the insulator 10.
- Figure 3 illustrates the connection between the cross beam 8 and the support structure 4.
- a receptacle 12 in the shape of two truncated cones placed back-to-back is first made from the inductively transparent inorganic cement composite material.
- the glass may be wound on a cardboard mandrel of the desired shape or a collapsible mandrel of that shape.
- the receptacle is then made a part of the support structure by winding it into the composite material during manufacture of the support structure.
- the crossbeam 8 is wound with known techniques except that a central section 14 is enlarged to provide an exterior shape similar to the interior of the receptacle.
- the maximum outside diameter of the cross beam 8 is just less than the smallest inside diameter of the receptacle to allow the cross beam to be inserted into the receptacle.
- the cross beam is secured to the receptacle by filling the gap 16 with grout, which preferably expands as it cures, to hold the cross beam securely to the support structure 4.
- Other means may be used to secure the cross beam to the support structure, such as by providing threaded holes for bolting the two parts together.
- other prior art structures may be used in combination with the components made of inductively transparent composites. For example, a wood crossbeam, and metal parts, such as bolts or brackets that are small and induct only insignificantly may be employed.
- Figure 2 illustrates one technique for holding a insulator 10 to the cross beam 8.
- the insulator includes a shaft 18 that has the insulator at one end and is threaded at the other for receiving a nut.
- the shaft passes through holes that have been drilled in the cross beam 8.
- the end of the cross beam may also be filled with grout or cement 20 by placing a plug of foam 22 in the end of the beam and pouring the grout in the end. This will seal the end of the beam and allow the nut to be tightened without damaging the beam.
- Figures 4 through 6 illustrate several techniques for attaching the support structure to the ground.
- the embodiments of these figures attach the support structure to a base that has previously been secured to the ground, whereas the embodiment shown in figure 1 simply places the bottom of the pole in a hole in the ground.
- the top of the pole should be capped.
- a pole made of the disclosed composite materials may have characteristics different from those of normally used poles, it may be desirable to add weight to other parts of the pole to adjust these characteristics.
- Figure 4 illustrates an embodiment where a cylindrical sleeve 24 having a flange 26 attached thereto, as by welding, is placed in the lower end of the support structure.
- the preferred method of constructing the support structure is by winding on a mandrel, and this results in the support structure's being hollow.
- the cylindrical sleeve can be placed inside the support structure such that the flange can be attached to a base 28 having threaded studs 30 by nuts 32.
- a gap 34 between the sleeve and the inside of the pole is filed with grout to hold the pole to the sleeve.
- Figure 5 shows an embodiment wherein a sleeve 36 is secured to the exterior of the pole 4. This sleeve is attached to a flange 26, which is bolted to the base 28 as shown in figure 4.
- the gap 38 is filled with grout.
- Figure 6 illustrates yet another embodiment wherein the iower end of the pole is tapered such that it narrows toward the end and is provided with a conical sleeve 40.
- the sleeve 40 is used as a mandrel during winding and the pole is provided with an increased number of circumferential windings to provide increased hoop strength in this area. Also, the sleeve 40 may be provided with a rough exterior to provide increased gripping with the interior of the pole.
- the sleeve 40 is provided with a bottom plate 42 having a central hole and a nut 44 aligned with the hole and welded to the plate.
- the bottom portion of the pole is received in an outer sleeve 46, which is secured to a flange 26 and supported by a conical shoulder 48, which is secured to the outer sleeve at its upper edge and also to the flange 26.
- the plate 42 is held in the outer sleeve by a bolt 50, which pulls the conical bottom part of the pole into the conical sleeve 46 to secure the pole to the flange. It will be appreciated that this is a quite secure arrangement because tension forces on the pole are resisted by the strength of the inwardly tapered bottom part of the pole. Because this part is provided with extra hoops, it is very strong and, thus, is capable of resisting such forces.
Abstract
Description
Claims (10)
- Apparatus (2) for supporting a high tension transmission line comprising
a support structure (4) having a structural wall for providing the primary structural strength for supporting said transmission line, the structural wall being of inductively transparent, substantially continuous fibers and inductively transparent inorganic cement cementing said fibers together, said fibers and cement imparting to the structural wall the primary structural strength for supporting said transmission line and being transparent to said electromagnetic fields generated by said transmission line, and
means (6) for securing said transmission line to said support structure (4), characterised in that said support structure (4) is for extending vertically and said means (6) for securing is an elongate element made of said inductively transparent, substantially continuous fibers and inductively transparent inorganic cement and is attached to said support structure (4) for extending horizontally. - Apparatus according to claim 1, characterised in that said means (6) for securing further comprises an insulator (10) attached to said elongate element for engaging said transmission line.
- Apparatus according to claim 1 or claim 2, characterised in that said support structure (4) is an elongate, tapered pole.
- Apparatus according to any preceding claim, characterised in that said support structure (4) includes a receptacle (12) for attaching said means (6) for securing to said support structure (4).
- Apparatus according to claim 4, characterised in that said receptacle (12) comprises a tapered sleeve extending across said support structure (4) for receiving said means (6) for securing therein.
- Apparatus according to any preceding claim, characterised in that the apparatus further comprises means (24,26,30,32; 26,30,32,36; 26,30,32,40,42,44,50) for attaching said support structure (4) to a base (28).
- Apparatus according to claim 6, characterised in that said support structure (4) comprises a hollow portion at one end of said means (24,26,30,32; 26,30,32,40,42,44,50) for attaching comprises means (24; 40) for engaging the interior of said hollow portion and a flange (26) for engaging said base (28).
- Apparatus according to claim 7, characterised in that said means (24) for engaging comprises a cylindrical tube (24) that extends vertically and is secured to said flange (26), wherein said flange extends horizontally.
- Apparatus according to claim 7, characterised in that said hollow portion is in the shape of a truncated cone tapering in a direction toward said one end and said means (40) for engaging comprises a vertically extending element (40) in the shape of said truncated cone.
- Apparatus according to claim 6, characterised in that said means (26,30,32,36) for attaching comprises means (36) for engaging the exterior of one end of said support structure and a flange (26) for engaging said base (28).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2075396P | 1996-06-28 | 1996-06-28 | |
US20753P | 1996-06-28 | ||
PCT/US1997/010794 WO1998000615A1 (en) | 1996-06-28 | 1997-06-26 | Improved power transmission support structures |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0907807A1 EP0907807A1 (en) | 1999-04-14 |
EP0907807A4 EP0907807A4 (en) | 2002-11-06 |
EP0907807B1 true EP0907807B1 (en) | 2004-08-18 |
Family
ID=21800371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97930177A Expired - Lifetime EP0907807B1 (en) | 1996-06-28 | 1997-06-26 | Improved power transmission support structures |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0907807B1 (en) |
AT (1) | ATE274117T1 (en) |
AU (1) | AU723443B2 (en) |
CA (1) | CA2259182C (en) |
DE (1) | DE69730329T2 (en) |
ES (1) | ES2225978T3 (en) |
NZ (1) | NZ333575A (en) |
WO (1) | WO1998000615A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20002104A1 (en) * | 2000-09-28 | 2002-03-28 | Iguzzini Illuminazione Srl | LAMP FOR STREET LIGHTING |
NL1027605C2 (en) * | 2004-11-26 | 2006-05-29 | Laszlo Imre Vakar | High voltage pylon, energy transport system, energy transport method and assembly method. |
WO2007016347A1 (en) * | 2005-07-29 | 2007-02-08 | Specialty Composites, Llc | Cement-containing composition for use with alkali-resistant fiberglass and poles made therefrom |
NO20160271A1 (en) * | 2016-02-16 | 2016-11-04 | Comrod As | Apparatus and method for attaching and creating a composite mast. |
NO346092B1 (en) * | 2020-08-27 | 2022-02-07 | Comrod As | MOUNTING FOR A COMPOSITE MAST TO AN UPPENDING COINIC SHAPE CONSTRUCTION PILLAR WITH A RING-FOLDED FLANGE, AND PROCEDURE FOR ATTACHING A COMPOSITE MAST WITH SUCH A COINIC SHAPED MOUNTING PILLAR TO THE GROUND |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4088808A (en) * | 1976-01-16 | 1978-05-09 | Cornwell Charles E | Shaped articles of hydraulic cement compositions with a glossy reflective surface and reinforced with fiber glass |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US839272A (en) * | 1906-09-24 | 1906-12-25 | Anderson G Crow | Cement pole. |
US1711824A (en) * | 1926-07-12 | 1929-05-07 | George E Barnhart | Tapered drawn structural element |
US2066419A (en) * | 1934-07-26 | 1937-01-05 | Pfistershammer Josef | Tubular post |
US2128294A (en) * | 1936-04-18 | 1938-08-30 | Robert B Gage | Post |
US2702103A (en) * | 1948-11-10 | 1955-02-15 | Pfistershamer Josef | Tubular pole |
US3713262A (en) * | 1970-12-10 | 1973-01-30 | J Jatcko | Taper lock break-away pole structure |
US4007075A (en) * | 1973-12-10 | 1977-02-08 | Cascade Pole Company | Method of making a fiberglass pole |
US4312162A (en) * | 1979-08-15 | 1982-01-26 | Jonas Medney | Reinforced pole |
US5285613A (en) * | 1992-01-31 | 1994-02-15 | Goldsworthy W Brandt | Pultruded joint system and tower structure made therewith |
US4785593A (en) * | 1986-10-27 | 1988-11-22 | Munoz Jr Jose C | Structural building system |
US4921222A (en) | 1988-04-05 | 1990-05-01 | Advanced Metals Technology Corp. | Fiber composite article and method of manufacture |
US4813651A (en) * | 1988-06-30 | 1989-03-21 | Rutledge Terry G | Fence post with saddle support construction and method therefore |
US5197253A (en) * | 1990-12-31 | 1993-03-30 | Johnson David W | Interlocking joint pultrusion construction |
US5175971A (en) * | 1991-06-17 | 1993-01-05 | Mccombs P Roger | Utility power pole system |
-
1997
- 1997-06-26 DE DE69730329T patent/DE69730329T2/en not_active Expired - Lifetime
- 1997-06-26 NZ NZ333575A patent/NZ333575A/en not_active IP Right Cessation
- 1997-06-26 AT AT97930177T patent/ATE274117T1/en not_active IP Right Cessation
- 1997-06-26 CA CA002259182A patent/CA2259182C/en not_active Expired - Fee Related
- 1997-06-26 AU AU58328/98A patent/AU723443B2/en not_active Ceased
- 1997-06-26 ES ES97930177T patent/ES2225978T3/en not_active Expired - Lifetime
- 1997-06-26 WO PCT/US1997/010794 patent/WO1998000615A1/en active IP Right Grant
- 1997-06-26 EP EP97930177A patent/EP0907807B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4088808A (en) * | 1976-01-16 | 1978-05-09 | Cornwell Charles E | Shaped articles of hydraulic cement compositions with a glossy reflective surface and reinforced with fiber glass |
Also Published As
Publication number | Publication date |
---|---|
DE69730329T2 (en) | 2005-09-08 |
EP0907807A1 (en) | 1999-04-14 |
AU723443B2 (en) | 2000-08-24 |
WO1998000615A1 (en) | 1998-01-08 |
ATE274117T1 (en) | 2004-09-15 |
CA2259182A1 (en) | 1998-01-08 |
ES2225978T3 (en) | 2005-03-16 |
NZ333575A (en) | 1999-10-28 |
AU5832898A (en) | 1999-01-25 |
DE69730329D1 (en) | 2004-09-23 |
EP0907807A4 (en) | 2002-11-06 |
CA2259182C (en) | 2002-11-19 |
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