NL2016438B1 - Power pylon with flange connected tubular segments. - Google Patents

Power pylon with flange connected tubular segments. Download PDF

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Publication number
NL2016438B1
NL2016438B1 NL2016438A NL2016438A NL2016438B1 NL 2016438 B1 NL2016438 B1 NL 2016438B1 NL 2016438 A NL2016438 A NL 2016438A NL 2016438 A NL2016438 A NL 2016438A NL 2016438 B1 NL2016438 B1 NL 2016438B1
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Netherlands
Prior art keywords
flange
flanges
annular
face
pylon according
Prior art date
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NL2016438A
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Dutch (nl)
Inventor
Gerardus Maria Platenburg Josephus
Original Assignee
Vdl Groep B V
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Application filed by Vdl Groep B V filed Critical Vdl Groep B V
Priority to NL2016438A priority Critical patent/NL2016438B1/en
Priority to EP17159607.5A priority patent/EP3219876B1/en
Priority to DK17159607.5T priority patent/DK3219876T3/en
Priority to EP19172737.9A priority patent/EP3591143B1/en
Priority to PT17159607T priority patent/PT3219876T/en
Application granted granted Critical
Publication of NL2016438B1 publication Critical patent/NL2016438B1/en

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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
    • E04H12/08—Structures made of specified materials of metal
    • E04H12/085—Details of flanges for tubular masts

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

A power pylon comprises at least two tubular segments interconnected by two opposing annular flanges which are attached to the respective ends of the tubular segments. The annular flanges extend radially inwards and each having an end face that faces the end face of the opposing flange. The annular flanges have through bores distributed in a circle. The through bores of the two opposing flanges are aligned and bolts pass through said aligned through bores, wherein nuts cooperate with said bolts to bolt the opposing flanges together. The end face of at least one of the opposing annular flanges has a central annular recessed zone that is machined in said end face. The central annular recessed zone is flanked by a radially outward engagement surface and a radially inward engagement surface, which form the interface with the opposing flange.

Description

P32672NLOO/CHO
Title: Power pylon with flange connected tubular segments
The invention relates to a power pylon comprising at least two tubular segments which are interconnected by an annular flange connection, the annular flange connection comprising two opposing annular flanges which are attached to the respective ends of the tubular segments, said annular flanges extending radially inwards and each having an end face that faces the end face of the opposing flange, the annular flanges each having through bores distributed in a circle, wherein the through bores of the two opposing flanges are aligned, wherein the annular flange connections furthermore comprise bolts that pass through said aligned through bores, and nuts cooperating with said bolts so as to bolt the opposing flanges together.
An example of such a pylon is known as “Wintrack pylon”, which comprises two steel tubular segments with each a length of about 30m. The outer diameter of this known pylon tapers from about 2,4m at the bottom to 0,5m at the top. The wall thickness of the two tubular segments is about 16 mm. The upper segment has a weight of about 13 tons and the lower segment has a weight of about 40 tons. At the location of the flange connection the pylon has an outer diameter of about 1,2m.
The upper tubulars segment of the “Wintrack pylon” has a flange attached (welded) at its lower end, which flange extends radially inwards. The lower tubular segment has a flange attached (welded) at its upper end which also extends radially inwards. The flanges are each provided with for example twenty-four through bores aranged in a circle. The bores of the opposing flanges are aligned and bolted together by bolts and nuts.
Although the known pylons have been successfully built, there have occurred some problems with the sealing between the flanges. A defect in the sealing between the flanges may increase the risk of corrosion of the bolts due to exposure to moist/water.
From EP 1 514 029 it is known to provide a layer of a thermoplastic material between the flanges to compensate for surface unevenness and, additionally with silicone filling mass to prevent moisture from entering between the flanges. This solution however requires additional parts and complication during installation (heat the thermoplastic layer).
The present invention has for an object to mitigate the problem of exposure of the bolts to moist in a simple but effective manner.
This object is achieved by a pylon according to the preamble of claim 1, wherein the end face of at least one of the opposing annular flanges has a central annular recessed zone that is machined in said end face, said central annular recessed zone being flanked by a radially outward engagement surface and a radially inward engagement surface which form the interface with the opposing flange.
This connection structure according to the invention achieves that two radially spaced relatively narrow coaxial annular interfaces are created between the two opposing flanges. Thereby any unevenness in the flange surfaces is compensated.
In a practical embodiment the central annular recessed zone has a width that is between 70% - 75%, preferably around 73% of the width of the end face of the annular flange.
Preferably the radially outward engagement surface and the radially inward engagement surface have substantially the same width.
Thereby, in the mentioned practical embodiment, the two radially spaced relatively narrow coaxial annular interfaces between the opposing flanges each have width that is about 12,5% -15% of the total flange width. By such a width of the interfaces a good compromise is achieved between the load distribution at the interfaces, and on the other hand the approximation of a two-point load which mitigates the unevenness problem of the interfaces.
In a preferred embodiment the end face of both of the opposing annular flanges have an annular recessed zone that is machined in the end face. The flanges are manufactured separately from the tubular walls of the tubular pylon segments and are then attached to the respective tubular walls by welding. It is advantageous to manufacture only one single type of flange both for the upper and the lower pylon segment. This prevents that the wrong flange can be welded to the tubular wall and two opposing flanges can be of the type having no recess.
In a possible practical embodiment the annular flange has a thickness and the central annular recessed zone has a depth with respect to the radially outward and radially inward engagement surfaces, wherein the ratio between said depth and said thickness is within the range 0,02 - 0,03, preferably around 0,027.
In a possible practical embodiment the flange has an outer diameter and the central annular recessed zone has a depth with respect to the radially outward and radially inward engagement surfaces, wherein the ratio between said depth and an outer diameter of the flange is between 0,001 - 0,002, preferably between 0,0015 and 0,0020, more preferably around 0,0017.
In a preferred embodiment the bolts have a head which is arranged against the lower annular flange of the flange connection.
In a preferred embodiment the connection furthermore comprises washers arranged between the flange surface and the bolt heads and nuts, wherein the washer at the lower flange has a radial groove extending from the inner side of the washer to the outer side of the groove.
The radial groove may have a depth that corresponds to about half of the thickness of the washer. In a practical embodiment the washer may have a thickness of about 8mm and the groove may have depth of about 4mm.
The radial groove, in the mounted state of the washer, preferably faces the flange surface.
The groove in the washer at the lower flange of the connection serves as a drainage for water/moist that for some reason has entered in the through bores. If the water would stay in the bores the bolts might get exposed too long to the moist and get corroded, whereby the risk of failure of the bolt increases. By draining the possible water from the bores through the groove this risk is reduced.
The invention will be further elucidated in the following description with reference to the drawing, wherein:
Fig. 1 shows in a view from above a flange connection of a pylon according to the invention, Fig. 2 shows a cross section according to C-C as indicated in Fig. 1,
Fig. 3 shows in a view from above one of the flanges of the connection of Fig. 1,
Fig. 4 shows a cross section according to A-A in Fig. 3,
Fig. 5 shows a detail of Fig. 4, and
Fig. 6 shows a view in perspective of a washer for a connection shown in Fig. 1.
In Figs 1 and 2 is illustrated a flange connection to connect two tubular segments 1 and 2 of a power pylon. Such a power pylon carries overhead power lines. The tubular segments 1,2 each have a tubular wall indicated by reference numerals 3, 4 respectively. In a practical embodiment of the pylon the tubular walls of the pylon may have an outer diameter of about 1,1 - 1,2 m at the location of the flanged connection. The outer diameter D0 (cf. Fig. 3) of the flanges corresponds to the outer diameter of the tubular walls
The upper tubular segment 1 has an upper flange 5, which is attached to the lower end of the upper tubular wall 3. The flange 5 is attached to the tubular wall by welding and extends radially inwards therefrom. The weld is indicated by reference numeral 7.
The lower tubular segment 2 has a lower flange 6, which is attached to the upper end of the lower tubular wall 4. The flange 6 is attached to the tubular wall by welding and extends radially inwards therefrom. The weld is indicated by reference numeral 8.
The flanges 5, 6 have an upstanding circumferential rim 19, at which the flange is welded to the tubular walls. The rim 19 may have a height of about 25 mm. This rim 19 has the advantage that the welding heat is applied at some distance of the flanges 5, 6 whereby the effect of deformation, thermal tension and additional unevenness of the flanges 5, 6 is reduced.
In the preferred embodiment the flanges 5 and 6 are identical. The separate flange 5, 6 is shown in Fig. 3 and 4. Identical flanges 5, 6 results in that all flanges can be made by the same forming and machining process and no mistakes can be made regarding which flange has to be welded to which tubular wall 3, 4.
For a pylon according to the invention the flanges 5, 6 may have thickness i ^ 30 mm, for example 60 - 80 mm. The flanges 5, 6 may have an inner diameter D, of 700 - 800 mm.
The flanges 5, 6 are provided with through bores 9 distributed over the circumference of the flange, as can be seen in Figs 3 and 4.
In the particular embodiment shown in the figures there are twenty-four bores 9 provided in the flange 5, 6. Bolts 10 with a threaded shank are inserted through the aligned bores 9 of the two opposing flanges 5, 6. The bolts 10 are inserted from below such that the bolt head 10A is located at the lower flange 6. Nuts 11 are screwed on the bolts 10 to tighten the flanges 5, 6 together. For the pylon according to the invention M48 bolts can be used.
Between the nut 11 and the upper flange a washer 13 is arranged. Also between the bolt head 10A and the lower flange a washer 12 is arranged. The lower washer 12 is shown separately in Fig. 6. The washer 12 has an upper surface 12A in which a radial groove 14 is formed. When mounted the upper surface 12A is facing the flange 6. The radial groove 14 forms with the flange surface a channel that communicates with the bore 9. This has as an advantage that if moist/water somehow ends up in the bore 9, it will be able to drain at the lower side from the bore 9 through the formed channel. In this way a retention of water in the bores 9, which is potentially detrimental for the bolt 10, is prevented.
In a practical embodiment the washer 12 may have a thickness of about 8mm and the groove 14 may have a depth of about 4mm.
The opposing annular flanges 5, 6 each have an end face 15, which faces the end face 15 of the other one of the flanges 5, 6. The end face 15 has a central annular recessed zone 16 that extends circumferentially. The annular recessed zone 16 is machined in said end face 15. The central annular recessed zone 16 is flanked by a radially outward engagement surface 17 and a radially inward engagement surface 18. The radially outward engagement surface 17 and radially inward engagement surface 18 form the interface with the same surfaces 17, 18 of the opposing flange 5, 6 when the flanges 5, 6 are clamped together (cf. Fig. 2). These surfaces 17, 18 are machined such that they each form an even plane. The radially inward engagement surface 18 may be a little recessed with respect to the outward engagement surface 17.
The central annular zone 16 has a depth d of about 2mm with regard to the outer and inner engagement surfaces 17, 18.
By providing the recessed central annular zone 16 the contact surface between the engaging flanges 5, 6 is reduced whereby the evenness and thus the tightness between the opposing contacting surfaces 17, 18 can be better guaranteed. This has a positive influence on the prevention of water penetration between the flanges without the use of a separate sealing gasket or the like between the flanges.
The total flange width Wt may be about 185 mm. The width Wcz of the recessed annular zone 16 may be about 130mm. The width Weso, Wesi, of the engagement surfaces 17, 18 may be 25-30mm.

Claims (10)

1. Hoogspanningsmast omvattende ten minste twee buisvormige segmenten die onderling verbonden zijn door een ringvormige flensverbinding, waarbij de ringvormige flensverbinding twee tegenover elkaar gelegen ringvormige flenzen (5, 6) omvat die bevestigd zijn aan de respectieve einden van de buisvormige segmenten, waarbij de ringvormige flenzen zich radiaal naar binnen uitstrekken en elk een eindvlak (15) hebben dat naar het eindvlak (15) van de tegenovergelegen flens (5, 6) is gekeerd, waarbij de ringvormige flenzen (5, 6) elk doorgaande boringen (9) hebben die verdeeld zijn in een cirkel, waarbij de doorgaande boringen (9) van de twee tegenover elkaar gelegen flenzen (5, 6) in lijn zijn gelegen, waarbij de ringvormige flensverbinding verder bouten (10) omvat die door de in lijn liggende doorgaande boringen (9) steken, en moeren (11) die samenwerken met de bouten (10) om de tegenover elkaar gelegen flenzen (5, 6) tegen elkaar te bouten, met het kenmerk, dat het eindvlak (15) van ten minste een van de tegenover elkaar gelegen ringvormige flenzen (5, 6) een centraal en verdiept gelegen ringvormige zone (16) heeft die machinaal is aangebracht in het eindvlak (15), waarbij de centraal en verdiept gelegen ringvormige zone (16) geflankeerd wordt door een radiaal buitenste aangrijpingsoppervlak (17) en een radiaal binnenste aangrijpingsoppervlak (18) die het raakvlak vormen met de tegenover gelegen flens (5, 6).A high-voltage pylon comprising at least two tubular segments interconnected by an annular flange connection, the annular flange connection comprising two opposed annular flanges (5, 6) attached to the respective ends of the tubular segments, the annular flanges extend radially inwardly and each have an end face (15) that faces the end face (15) of the opposite flange (5, 6), the annular flanges (5, 6) each having through-going bores (9) distributed are in a circle, wherein the through bores (9) of the two opposite flanges (5, 6) are aligned, the annular flange connection further comprising bolts (10) passing through the aligned through bores (9) and nuts (11) cooperating with the bolts (10) for bolting the opposite flanges (5, 6) against each other, characterized in that the end face (15) of at least one of the opposed annular flanges (5, 6) has a central and recessed annular zone (16) which is mechanically arranged in the end face (15), the central and recessed annular zone (16) being flanked by a radially outer engagement surface (17) and a radially inner engagement surface (18) forming the interface with the opposite flange (5, 6). 2. Hoogspanningsmast volgens conclusie 1, waarbij het eindvlak (15) van beide van de tegenover elkaar gelegen ringvormige flenzen (5, 6) een centraal en verdiept gelegen ringvormige zone (16) heeft die machinaal is aangebracht in het eindvlak.The high-voltage pylon according to claim 1, wherein the end face (15) of both of the opposed annular flanges (5, 6) has a centrally and recessed annular zone (16) which is mechanically arranged in the end face. 3. Hoogspanningsmast volgens conclusie 1 of 2, waarbij de centraal en verdiept gelegen ringvormige zone (16) een breedte {Wcz) heeft die ligt tussen 70%-75%, bij voorkeur rond 73% van de breedte (Wt) van het eindvlak van de ringvormige flens.High-voltage pylon according to claim 1 or 2, wherein the centrally located and recessed annular zone (16) has a width (Wcz) that is between 70% -75%, preferably around 73% of the width (Wt) of the end face of the annular flange. 4. Hoogspanningsmast volgens een van de voorgaande conclusies, waarbij het radiaal buitenste aangrijpingsoppervlak (17) en het radiaal binnenste aangrijpingsoppervlak (18) in hoofdzaak dezelfde breedte hebben.High-voltage pylon according to any of the preceding claims, wherein the radially outer engaging surface (17) and the radially inner engaging surface (18) have substantially the same width. 5. Hoogspanningsmast volgens een van de voorgaande conclusies, waarbij de flens (5, 6) een dikte (t) heeft en de centraal en verdiept gelegen ringvormige zone (16) een diepte (cf) heeft ten opzichte van het radiale buitenste en radiaal binnenste aangrijpingsoppervlak, waarbij de ratio (d/t) tussen de genoemde diepte (cf) de genoemde dikte (t) binnen het bereik van 0,02-0,03 ligt, bij voorkeur rond 0,027.High-voltage pylon according to one of the preceding claims, wherein the flange (5, 6) has a thickness (t) and the centrally located and recessed annular zone (16) has a depth (cf) with respect to the radially outer and radially inner engagement surface, wherein the ratio (d / t) between said depth (cf) and said thickness (t) is in the range of 0.02-0.03, preferably around 0.027. 6. Hoogspanningsmast volgens een van de voorgaande conclusies, waarbij de flens (5, 6) een buitendiameter (D0) en de centraal en verdiept gelegen ringvormige zone (16) een diepte (cf) heeft ten opzichte van het radiaal buitenste en radiaal binnenste aangrijpingsoppervlak (17, 18), waarbij de ratio (cf/D0) tussen de genoemde diepte (cf) en een buitendiameter (D0) van de flens (5, 6) ligt tussen 0,001-0,002, bij voorkeur tussen 0,0015 en 0,0020, meer bij voorkeur rond 0,0017.High-voltage pylon according to one of the preceding claims, in which the flange (5, 6) has an outer diameter (D0) and the centrally located and recessed annular zone (16) has a depth (cf) with respect to the radially outer and radially inner engagement surface (17, 18), wherein the ratio (cf / D0) between said depth (cf) and an outside diameter (D0) of the flange (5, 6) is between 0.001-0.002, preferably between 0.0015 and 0, 0020, more preferably around 0.0017. 7. Hoogspanningsmast volgens een van de voorgaande conclusies, waarbij de bouten (10) een kop (10a) hebben die tegen de onderste ringvormige flens (6) van de flensverbinding is aangebracht.High-voltage pylon according to one of the preceding claims, wherein the bolts (10) have a head (10a) which is arranged against the lower annular flange (6) of the flange connection. 8. Hoogspanningsmast volgens een van de voorgaande conclusies, waarbij de verbinding verder onderlegringen (12, 13) omvat die zijn aangebracht tussen het flensoppervlak en de houtkoppen (10a) en moeren (11), waarbij de onderlegring (12) bij de onderste flens (6) een radiale groef (16) heeft die zich vanaf de binnenzijde van de onderlegring (12) naar de buitenzijde van de onderlegring (12) uitstrekt.The high-voltage pylon according to any of the preceding claims, wherein the connection further comprises washers (12, 13) arranged between the flange surface and the wood heads (10a) and nuts (11), the washer (12) at the lower flange ( 6) has a radial groove (16) extending from the inside of the washer (12) to the outside of the washer (12). 9. Hoogspanningsmast volgens conclusie 8, waarbij de radiale groef (14) een diepte heeft die overeenkomt met ongeveer de helft van de dikte van de onderlegring (12).The high-voltage pylon according to claim 8, wherein the radial groove (14) has a depth corresponding to approximately half the thickness of the washer (12). 10. Hoogspanningsmast volgens conclusie 8 of 9, waarbij de radiale groef (14), in de gemonteerde toestand van de onderlegring (12), gekeerd is naar het flensoppervlak.The high-voltage pylon according to claim 8 or 9, wherein the radial groove (14), in the mounted state of the washer (12), faces the flange surface.
NL2016438A 2016-03-15 2016-03-15 Power pylon with flange connected tubular segments. NL2016438B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL2016438A NL2016438B1 (en) 2016-03-15 2016-03-15 Power pylon with flange connected tubular segments.
EP17159607.5A EP3219876B1 (en) 2016-03-15 2017-03-07 Power pylon with flange connected tubular segments
DK17159607.5T DK3219876T3 (en) 2016-03-15 2017-03-07 POWER SUPPLY WITH FLOW-CONNECTED PIPE SEGMENTS
EP19172737.9A EP3591143B1 (en) 2016-03-15 2017-03-07 Power pylon with flange connected tubular segments
PT17159607T PT3219876T (en) 2016-03-15 2017-03-07 Power pylon with flange connected tubular segments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2016438A NL2016438B1 (en) 2016-03-15 2016-03-15 Power pylon with flange connected tubular segments.

Publications (1)

Publication Number Publication Date
NL2016438B1 true NL2016438B1 (en) 2017-10-02

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ID=55949043

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2016438A NL2016438B1 (en) 2016-03-15 2016-03-15 Power pylon with flange connected tubular segments.

Country Status (4)

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EP (2) EP3219876B1 (en)
DK (1) DK3219876T3 (en)
NL (1) NL2016438B1 (en)
PT (1) PT3219876T (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108180117B (en) * 2018-01-09 2023-10-31 重庆大学 Corrosion-resistant offshore wind power tower tube combined structure
NO345662B1 (en) 2018-11-02 2021-06-07 Tp Products As A flange element for a flange connection, a flange connection for a tower structure and a tower structure comprising such a flange connection.
DE102019218358A1 (en) * 2019-11-27 2021-05-27 Thyssenkrupp Steel Europe Ag Lattice structure for a tower of a wind turbine and tower of a wind turbine

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE10152018A1 (en) * 2001-10-22 2003-04-30 Gen Electric Component arrangement for manufacturing tower for wind power system has components with boundary surfaces bounding test channel enabling testing of contact between components
US20040112002A1 (en) * 2001-03-23 2004-06-17 Aloys Wobben Connecting flange for tubular components
US20100117353A1 (en) * 2007-01-26 2010-05-13 Renle Ma Flange assembly, a coupling flange and an assembly method tehreof

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
DE20006750U1 (en) 2000-04-12 2000-06-29 August Friedberg Gmbh Flange system with corrosion protection
DE10223429C1 (en) 2002-05-25 2003-05-28 Aloys Wobben Flange coupling method for wind turbine tower sections with softening of variable viscosity layer between cooperating flange surfaces during formation of flange coupling
US8490337B2 (en) * 2009-06-09 2013-07-23 Thomas Nott Word, III Structural flange connection system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040112002A1 (en) * 2001-03-23 2004-06-17 Aloys Wobben Connecting flange for tubular components
DE10152018A1 (en) * 2001-10-22 2003-04-30 Gen Electric Component arrangement for manufacturing tower for wind power system has components with boundary surfaces bounding test channel enabling testing of contact between components
US20100117353A1 (en) * 2007-01-26 2010-05-13 Renle Ma Flange assembly, a coupling flange and an assembly method tehreof

Also Published As

Publication number Publication date
EP3591143A2 (en) 2020-01-08
EP3591143B1 (en) 2023-11-22
EP3591143A3 (en) 2020-03-25
PT3219876T (en) 2019-09-20
EP3219876A1 (en) 2017-09-20
EP3591143C0 (en) 2023-11-22
EP3219876B1 (en) 2019-05-08
DK3219876T3 (en) 2019-07-08

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