EP3843913B1 - Verfahren zur herstellung eines polyhedrischen schraubenförmigen rohrs und dadurch hergestelltes polyhedrisches schraubenförmiges rohr - Google Patents

Verfahren zur herstellung eines polyhedrischen schraubenförmigen rohrs und dadurch hergestelltes polyhedrisches schraubenförmiges rohr Download PDF

Info

Publication number
EP3843913B1
EP3843913B1 EP19752713.8A EP19752713A EP3843913B1 EP 3843913 B1 EP3843913 B1 EP 3843913B1 EP 19752713 A EP19752713 A EP 19752713A EP 3843913 B1 EP3843913 B1 EP 3843913B1
Authority
EP
European Patent Office
Prior art keywords
strip
tube
helical tube
metal strip
polyhedral
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.)
Active
Application number
EP19752713.8A
Other languages
English (en)
French (fr)
Other versions
EP3843913A1 (de
Inventor
Paul Alexander De Vries
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.)
Tata Steel Nederland Technology BV
Original Assignee
Tata Steel Nederland Technology BV
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 Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Publication of EP3843913A1 publication Critical patent/EP3843913A1/de
Application granted granted Critical
Publication of EP3843913B1 publication Critical patent/EP3843913B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/155—Making tubes with non circular section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/156—Making tubes with wall irregularities
    • B21C37/158—Protrusions, e.g. dimples

Definitions

  • This invention relates to a method of producing a tube and to the tube produced thereby and use thereof.
  • a tube is cylindrical.
  • a cylindrical tube is not the most dimensionally stable tube if the tube is thin-walled.
  • Buckling is also a problem.
  • Buckling refers to the loss of stability of a structure and in its simplest form, is independent of the material strength where it is assumed that this loss of stability occurs within the elastic range of the material. Slender or thin-walled structures under compressive loading are susceptible to buckling.
  • JP2010007801 discloses a mathematical construct of cylindrical helical polyhedrons and refers in a very general sense to applications of such geometrical structures for aircraft fuselage or beverage containers.
  • Buckminster Fuller's work on the tetrahelix structure was implemented to great theatrical effect in the Mito Art Tower (JP) in 1990.
  • the method according to the invention provides a method to produce polyhedral helical tubes on an industrial scale.
  • a polyhedron In geometry, a polyhedron is a solid in three dimensions with flat polygonal faces, straight edges and sharp corners or vertices.
  • the word "polygon” means "many-angled”. Individual polygons are named according to the number of sides, combining a Greek-derived numerical prefix with the suffix -gon, e.g. pentagon, dodecagon. However, mathematicians generally use numerical notation, for example 6-gon for a hexagon, and 12-gon for a dodecahedron.
  • An ideal helical tube is a straight tube that is twisted along its longitudinal axis and which has smooth facets.
  • Figure 2 shows a sketch of such an ideal helical tube on the basis of a square (4-gon).
  • a square tube has four surfaces (top, bottom, left and right) which are long rectangles in figure 2 .
  • By twisting the 4-gon tube a helical tube is formed.
  • Figure 2 shows such a helical tube wherein the front surface is twisted over 360° in relation to the back surface. The original long rectangles have now become curved surfaces, and these curved surfaces are smooth and show no discontinuities.
  • the polyhedral helical tube referred-to in the present disclosure is a multifaceted tube wherein the facets consist of identically shaped triangles.
  • the helical character of the tube is provided by the fact that the identically shaped triangles are provided in the form of a metal strip with a width w, preferably in the form of a continuous strip. This strip may be provided in the form of a coil of metal strip.
  • the triangles in the strip are produced by a bending operation.
  • the polyhedral helical tube is thus an approximation of the ideal helical tube, but one which can be produced from a straight and flat strip of material without having to deform the material differently over the width of the strip, but can be produced by providing upward and downward kinks in a strip material thereby forming pairs of triangles which pair of triangles forms a parallelogram with two sides of the parallelogram being parallel to the edges of the strip material.
  • the deformation needed to allow the straight strip to be formed into a polyhedral helical tube is localised in the kinks, rather than spread over the entire strip width as in the 4-gon of figure 2 .
  • the triangles remain flat, and the only deformation is present in the upward and downward kinks.
  • the vertices of the polyhedral helical tube are lined up in a regular pattern on the surface of the polyhedral helical tube.
  • the straight lines between the vertices i.e. the edges a, b and c of the triangles
  • They also produce an apparent thickness of the tube which is larger than the thickness of the strip material. This is because the straight line between two neighbouring vertices cuts into the tube as a matter of principle. Depending on the choice of triangles, the apparent thickness decreases more or less.
  • the inscribed cylinder in the tube depends on the depth that the straight line between two neighbouring vertices cuts into the tube.
  • polyhedral helical tube referred-to in the present disclosure, is that all vertices are at the same distance r to the central axis of the tube, and that the sum of all corners of the six triangles around each vertex is 360°. This is because each vertex is surrounded by two pairs of 3 triangles. Since all triangles are identical, the sum is 360°.
  • the normal vector often simply called the "normal,” to a surface is a vector which is perpendicular to the surface at a given point.
  • the bisecting vector is a vector that goes through the central axis of the tube and is orthogonal to that axis. This is true for all pairs of adjacent triangles.
  • a last characteristic is that the centre of each of the sides of each triangle is closest to the central axis.
  • the method to produce the polyhedral helical tube starts from a metal strip with a width w, preferably in the form of a continuous strip.
  • a parallelogram is chosen on the basis of the desired apparent thickness of the polyhedral helical tube. The longer the diagonal, the deeper the diagonal cuts into the polyhedral helical tube because it connects vertices further away on the polyhedral helical tube.
  • the strip is kinked over the entire width over the dashed lines from side to side as depicted in figure 3a .
  • the edge of the material as seen from one side and the other is also depicted which shows that one kink is upwards and the next is downwards.
  • the pair of triangles i and ii form a parallelogram with two of its edges parallel to (and in this case coinciding with) the edges of the strip. So in terms of the circumscribed parallelogram consisting of the pairs of triangles the (short) diagonal of the parallelogram separating triangle i from triangle ii is kinked as well (see 3a).
  • the triangles are equilateral triangles and the circumscribed parallelogram has sides of a and a.
  • the triangles are isosceles triangles and the circumscribed parallelogram has sides of a and a (identical to figure 3a ).
  • the circumscribed parallelogram has sides of a and b, or b and c, or a and c, depending on which side of the triangle forms one of the diagonals in the parallelogram.
  • Figure 4a shows a tube according to the invention produced on the basis of the kinked strips of figure 3a consisting entirely of kinked strip material.
  • the kinked strip is forced into the curvature of the polyhedral helical tube before welding, not by curving the triangles by using the kinks.
  • each triangle i will be welded to a triangle ii on the previous loop.
  • This construction leads to a loop having a length of 12.5 triangle basis. When viewed in the flat plane, this would be considered an irregular 12.5-gon. There are 12.5 dark triangles to complete one full loop.
  • the weld between triangle i to a triangle ii on the previous loop the weld also forms a rib and the triangle i and ii are at an angle to each other, just like the kinks made in the metal strip.
  • the normals on i and ii are not parallel.
  • the parallelogram in 3b is the same as in 3a but the pair of triangles is different.
  • the triangles are now isosceles triangles, and not equilateral triangles.
  • the parallel edges of the parallelogram of triangle i and ii are kinked as well as the (long) diagonal of the parallelogram separating triangle i from triangle ii.
  • both tubes of figure 4a and 4b can be produced by spiral welding a kinked and originally flat strip wherein the kinks form pairs of equal triangles.
  • figures 4a and 4b these are highlighted.
  • the depth of the kinks is also larger for 4b, and thus the apparent thickness of the tube increases, which increases the resistance to buckling.
  • this apparent thickness effect is visualised for the helical hexagonal tube where the kinks intrude into the tube more substantially than in the helical dodecahedral tube.
  • the polyhedral helical tube can be produced by spiral-welding one strip, that is provided with the kinks forming the triangles, and optionally also already the curve forming the tube, beforehand by a suitable bending or roll-forming apparatus.
  • the helical hexagonal tube can be produced by spiral welding two kinked strips simultaneously.
  • the two kinked strips can be built up from individual strips first (in figure 4b three strips could be welded together to produce one kinked strip) or the wide strip can be kinked in a suitable bending or roll-forming apparatus so that the up and downward kinks are already present in the strips before starting the spiral welding.
  • the tube polyhedral helical tube according to the invention is not twisted after producing the tube, but twisted as a result of the fact that the strips are provided with kinks in a triangular pattern which "pop" into the right direction (inwardly or outwardly) while the edges of the strips are joined together.
  • the presence of the kinks form the elements that contribute to the increase in buckling resistance of the polyhedral helical tube.
  • the kinks that pop inwardly are the intruding reinforcements against buckling, the kinks that pop outwardly are the protruding reinforcements against buckling.
  • the intruding and protruding kinks provide a thicker apparent thickness of the strip and that is what contributes to the buckling resistance.
  • the intruding kinks of the 11.5-gon of figure 4b are deeper than the intruding kinks of the 12.5-gon of figure 4a .
  • the apparent thickness of the 11.5-gon is consequently higher and therefore the resistance against buckling is also higher.
  • Figure 7b this is illustrated on the basis of the polyhedral helical tube of figure 7a .
  • the distance to the central axis is plotted for the points indicated by the grey dots. It is shown in figure 7b that the distance to the central axis varies between an inscribed and circumscribed circle.
  • the distance between the inscribed and circumscribed circle can be considered a measure for the apparent thickness of the tube, which is significantly larger than the thickness of the metal strip, and therefore the resistance to buckling or the mechanical strength of the tube is also larger.
  • the reinforcements against buckling are the ribs of the triangles making up the polyhedral helical tube.
  • Figure 4d shows a polyhedral helical tube consisting of, in this example, a hexagon (6-gon) that is perpendicular to the longitudinal axis of the tube that is rotated along its centre while moving along this longitudinal axis.
  • the ideal helical tube would have six smoothly curved surfaces with the 6 corners of the hexagon each forming a perfect helix (like in figure 2 for the 4-gon).
  • the plane between each of the neighbouring helix is again filled with equal triangles (i and ii) as depicted in figure 4d wherein one set of equal triangles is highlighted.
  • Figure 4e shows the same polyhedral helical tube in which the spirals run orthogonal to the six strips. This shows that the same polyhedral helical tube can be made using conventional spiral welding using one or more spiral welding machines.
  • a polyhedral helical tube is not limited to any particular number of sides, as long as the pairs of triangles provide increased resistance to buckling of the polyhedral helical tube.
  • the lowest value for the polyhedral helical tube on the basis of a regular polyhedron is the 3-gon (triangle).
  • the 3-gon (triangle) and 4-gon (square) are not very practical, hence have not been retained in the present invention, because the apparent thickness is so large that the space in the tube is small, compared to higher value x-gons which already approach the circular cross section more closely.
  • the maximum value for x in x-gon is the value in which no significant strengthening effect is obtained.
  • the higher the value of x the more the tube resembles a cylindrical tube, and there the increase in apparent thickness provided by the triangles is reduced to a value that is no longer relevant.
  • the polyhedral helical tube is, as seen along the connection between two consecutive loops of the helix, at least a 6-gon, more preferably a 7-gon. Even more preferably the polyhedral helical tube is at least a 10-gon.
  • a suitable upper value is a 20-gon, preferably at most a 15-gon. In this case the value x in x-gon need not be a natural number but can be a rational number as well.
  • the x in x-gon also represents the number of triangle bases required for one loop of the helix. If the length of one loop is 12.5 triangles bases, then the x-gon is a 12.5 gon.
  • the strip material is preferably provided as as-rolled steel strip, which may be hot-rolled, optionally galvanized and/or organically coated, or cold-rolled, annealed and optionally galvanized and/or organically coated.
  • the as-rolled or as-coated steel strip is usually provided in the form of a coiled steel strip.
  • the process to produce the polyhedral helical tube optionally comprises levelling a strip which is usually provided in the form of a coiled strip, optionally end cut and welded to a preceding strip, provided with kinks so as to form pairs of equal triangles, wherein each pair of triangles forms a parallelogram wherein two of the parallel edges of the parallelogram are parallel to the edges of the strip and wherein each of the other two parallel edges of the parallelogram and a diagonal of the parallelogram respectively is kinked consecutively upwardly and downwardly, spiral welding the strip to form a polyhedral helical tube.
  • the simplest procedure is to produce the polyhedral helical tube on the basis of pairs of equal triangles wherein the kinks run from one edge to the other edge of the strip, so that a pair of triangles occupies the entire width of the strip, as depicted in figure 3a and 3b . It is also theoretically possible to produce a kinked strip with two or more rows of pairs of equal triangles. However, due to the presence of upward and downward kinks in one sheet, it will be more difficult to bend and weld and this is not deemed to be very practical.
  • the kinking operation is preferably performed at ambient temperatures so as not to complicate the process or affect the properties of the metal strip in a negative way.
  • the kinking angle alpha is negative and the kinking angle beta is positive.
  • both the kinking angle alpha and the kinking angle beta is positive.
  • the flat metal strip is provided as as-rolled strip, or as slit as-rolled strip.
  • the width of the strip can be carefully controlled, which is important to control the gap between two adjoining edges of triangles to be welded together and to safeguard a smooth operation of the kinking and welding process.
  • the metal strip is hot-rolled strip, preferably provided in the form of a coiled strip. This is an economic starting material for the flat metal strip and can be provided in many appropriate thicknesses, suitable for a polyhedral helical tube.
  • the metal strip is a galvanized and/or organically coated hot-rolled strip.
  • the metal of the metal strip is steel or a steel alloy (including stainless steel alloys), or aluminium or an aluminium alloy.
  • the welding step is a conventional welding step and may be laser welding, hybrid welding, gas metal arc welding, etc.
  • the particular shape of the polyhedral helical tube may reduce the need for expansion joints because it is able to absorb some or all of the expansion itself, particularly if the tube segments are alternating clockwise and anticlockwise helical tube segments.
  • the tube producible can be very small or very large.
  • the principle is the same for a tube of the dimension of an air-conditioning duct or for a tube for a Hyperloop or Evacuated Tube Transport system (ETT) application.
  • ETT Evacuated Tube Transport system
  • the invention is also embodied in a polyhedral helical tube produced according to the invention.
  • the polyhedral helical tube is used for underpressure applications (i.e. near vacuum applications), such as a tube for an Evacuated Tube Transport system.
  • underpressure application is meant that the pressure in the tube segment is lower than outside the tube segment.
  • the tube segment is therefore under external pressure.
  • One such underpressure application is a tube in an evacuated tube transport system (ETT).
  • ETT evacuated tube transport system
  • a hyperloop is a proposed mode of ETT for passenger and/or freight transportation, first used to describe an open-source vactrain design released by a joint team from Tesla and SpaceX. Drawing heavily from Robert Goddard's vactrain, a hyperloop comprises a sealed vacuum tube or system of vacuum tubes through which a pod may travel free of air resistance or friction conveying people or objects at high speed and acceleration.
  • the underpressure application or near vacuum application is an evacuated tube transport system tube
  • the internal atmosphere in the tube is, in use, near vacuum.
  • near vacuum means that the pressure inside the tube is less than 10 kPa ( ⁇ 0.1 bar), preferably less than 1 kPa ( ⁇ 0.01 bar or 10 mbar), even more preferably less than 500 Pa ( ⁇ 5 mbar) or even 200 Pa ( ⁇ 2 mbar), or even about 100 Pa ( ⁇ 1 mbar).
  • the tube is used for an ETT-system rails and other auxiliary equipment needs to be installed for the ETT to function.
  • the rails and other auxiliary equipment may be mounted in the tubes with the help of support structures which may have the form of a (polygonal) ring through which the ETT-pod may travel and onto which additional support structures, the auxiliary equipment and the rails may be mounted. If suitably shaped these ring like support structures may function as additional stiffening and anti-buckling elements.
  • the tube according to the invention needs to be supported only at limited intervals of, for example 30 meters.
  • additional support means may be provided to support the tube. These additional support means may comprise a steel beam or structure, or a concrete beam or structure.
  • the tube according to the invention is suitable for constructing an evacuated tube transport system.
  • the specific properties of the tube, and in particular its ability to perform under conditions wherein the pressure exerted on it from outside the tube is significantly higher than the pressure in the tube make it also suitable for the application of tubes operating under similar pressure conditions. Examples of these applications are underground or underwater tunnels for traffic such as bicycle tunnels, car tunnels, train tunnels, maintenance tunnels or shafts, tubes in hydro-electric power stations, gas storage systems in which underpressure occurs or may occur, etc.
  • the stiffness and mechanical strength of the tube built for underpressure applications as defined in the appended claims may also make excellently applicable under conditions wherein the pressure inside the tube is higher than outside or the same as outside.
  • these applications are gas conduits, e.g. in climate control systems, chimneys, etc. or a tower structure, e.g. for a windmill, telecommunication equipment, and the like.
  • the tube according to the invention can also be applied, and due to its inherent stiffness and strength, it is likely to have thinner material thickness and therefore a lower weight.
  • a polyhedral helical tube for an ETT-system is about half the weight, with a similar amount of welding length.
  • the polyhedral helical tube can be produced or (if necessary) divided into shorter sections that enable transport to the site where the tube for the ETT-system is constructed.
  • FIG 5 a schematic device to produce a polyhedral helical tube according to the invention (i.e. based on the triangles pairs) is drawn.
  • the different steps are as follows:
  • Step 6 and 7 are critical for the method according to an embodiment of the invention.
  • the two process steps are preferably linked in a continuous process. It is conceivable that the kinking process is separate from the welding, but due to the geometry of the kinked metal strip the kinked metal strip assumes a helical form, and therefore it makes sense to link the kinking and welding step and feed the kinked metal strip immediately into the welding apparatus.
  • Figure 6 shows a metal strip with different kink lines i, ii, iii, iv, v (ii and iv dashed, and i, ii and iii dash-dot, representing the two different bending angles), the two triangles a and b and the parallelograms circumscribing a and b.
  • Figure 7a and b show a polyhedral helical tubes and the increased effective thickness.
  • Figure 8a to d show different polyhedral helical tubes with different angles a and b as defined in figure 8a , and the required bending angles alpha and beta.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (16)

  1. Verfahren zum Herstellen eines polyhedrischen schraubenförmigen Metallrohrs für Unterdruckanwendungen des Typs, bei dem der Druck innerhalb des Rohrs weniger als 10kPa ist, wobei eine einzelne Schleife des polyhedrischen schraubenförmigen Rohrs zumindest 6 Segmente (6-Eck) umfasst, wobei ein flacher Metallstreifen (1) mit Knicken (i, ii, iii, iv, ...) über die gesamte Breite des Streifens bereitgestellt ist, um Paare aus angrenzenden und gleichen Dreiecken (a, b) zu bilden, wobei jedes Paar aus angrenzenden Dreiecken ein Parallelogramm bildet, wobei zwei der parallelen Kanten des Parallelogramms mit den Kanten des Streifens zusammenfallen und wobei jeweils jede der anderen zwei parallelen Kanten des Parallelogramms und eine Diagonale des Parallelogramms nacheinander in einem Winkel alpha und einem Winkel beta geknickt ist, gefolgt von Spiralschweißen des Streifens, um das polyhedrische schraubenförmige Rohr zu bilden, wobei die Kante eines Dreiecks vom Typ "a", welche die Kante des Metallstreifens bildet, mit der Kante eines Dreiecks vom Typ "b" in der vorhergehenden Schleife verschweißt ist und wobei die Kante eines Dreiecks vom Typ "b", welche die Kante des Metallstreifens bildet, mit einem Dreieck vom Typ "a" in der vorhergehenden Schleife verschweißt ist.
  2. Verfahren nach Anspruch 1, wobei der Winkel alpha negativ ist und der Winkel beta positiv ist.
  3. Verfahren nach Anspruch 1 oder 2, wobei die Knicke durch einen Press- oder Biegevorgang bereitgestellt sind.
  4. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen als Walzstreifen oder als geschlitzter Walzstreifen bereitgestellt ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen warmgewalzter Streifen ist.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen verzinkter und/oder organisch beschichteter warmgewalzter Streifen ist.
  7. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen kaltgewalzt, geglüht und optional verzinkt und/oder organisch beschichtet ist.
  8. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen in der Form eines aufgerollten Streifens bereitgestellt ist.
  9. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Metall Stahl oder eine Stahllegierung oder Aluminium oder eine Aluminiumlegierung ist.
  10. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Metallstreifen einem oder mehreren der folgenden Prozessschritte unterzogen wird:
    - Nivellieren;
    - geschnitten und mit einem vorhergehenden Streifen verschweißt, um kontinuierliche Herstellung zu ermöglichen.
  11. Verfahren nach einem der vorhergehenden Ansprüche, wobei eine einzelne Schleife des polyhedrischen schraubenförmigen Rohrs zumindest 10 Segmente (10-Eck) umfasst.
  12. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Unterdruckanwendung ein Vakuumrohrtransportsystem (ETT) ist, wobei das polyhedrische schraubenförmige Rohr mit Schienen bereitgestellt ist und andere Hilfsausrüstung in dem polyhedrischen schraubenförmigen Rohr mit der Hilfe von Stützstrukturen in der Form von Ringen montiert ist, durch die sich in Verwendung der ETT-Pod bewegen kann.
  13. Verfahren nach Anspruch 11, wobei die Ringe als Versteifungs- und Knickschutzelemente fungieren.
  14. Polyhedrisches schraubenförmiges Metallrohr für Unterdruckanwendungen des Typs, bei dem der Druck innerhalb des Rohrs weniger als 10kPa ist, wobei das polyhedrische schraubenförmige Rohr aus einem spiralgeschweißten geknickten Metallstreifen besteht, der nach dem Verfahren nach einem der Ansprüche 1-13 hergestellt ist, wobei eine einzelne Schleife des polyhedrischen schraubenförmigen Rohrs zumindest 6 Segmente (6-Eck) umfasst, wobei der spiralgeschweißte geknickte Metallstreifen ein flacher Metallstreifen (1) ist, der mit Knicken (i, ii, iii, iv, ...) über die gesamte Breite des Streifens bereitgestellt ist, um Paare aus angrenzenden und gleichen Dreiecken (a, b) zu bilden, wobei jedes Paar aus angrenzenden Dreiecken ein Parallelogramm bildet, wobei zwei der parallelen Kanten des Parallelogramms mit den Kanten des Streifens zusammenfallen und wobei jeweils jede der anderen zwei parallelen Kanten des Parallelogramms und eine Diagonale des Parallelogramms nacheinander in einem Winkel alpha und einem Winkel beta geknickt ist, wobei der Streifen spiralgeschweißt ist, um das polyhedrische schraubenförmige Rohr zu bilden, wobei die Kante eines Dreiecks vom Typ "a", welche die Kante des Metallstreifens bildet, mit der Kante eines Dreiecks vom Typ "b" in der vorhergehenden Schleife verschweißt ist und wobei die Kante eines Dreiecks vom Typ "b", welche die Kante des Metallstreifens bildet, mit einem Dreieck vom Typ "a" in der vorhergehenden Schleife verschweißt ist.
  15. Polyhedrisches schraubenförmiges Rohr nach Anspruch 14, wobei eine einzelne Schleife des polyhedrischen schraubenförmigen Rohrs zumindest 10 Segmente (10-Eck) umfasst.
  16. Verwendung des polyhedrischen schraubenförmigen Rohrs nach Anspruch 14 oder 15 für Unterdruckanwendungen, wie als Rohr für ein Vakuumrohrtransportsystem.
EP19752713.8A 2018-08-28 2019-08-15 Verfahren zur herstellung eines polyhedrischen schraubenförmigen rohrs und dadurch hergestelltes polyhedrisches schraubenförmiges rohr Active EP3843913B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18191327 2018-08-28
PCT/EP2019/071968 WO2020043506A1 (en) 2018-08-28 2019-08-15 Method for producing a polyhedral helical tube and polyhedral helical tube produced thereby

Publications (2)

Publication Number Publication Date
EP3843913A1 EP3843913A1 (de) 2021-07-07
EP3843913B1 true EP3843913B1 (de) 2024-03-06

Family

ID=63442547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19752713.8A Active EP3843913B1 (de) 2018-08-28 2019-08-15 Verfahren zur herstellung eines polyhedrischen schraubenförmigen rohrs und dadurch hergestelltes polyhedrisches schraubenförmiges rohr

Country Status (3)

Country Link
EP (1) EP3843913B1 (de)
KR (1) KR20210050516A (de)
WO (1) WO2020043506A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110382129B (zh) * 2017-01-12 2021-05-18 吉斯通塔系统公司 圆柱形管形成

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007801A (ja) 2008-06-29 2010-01-14 Taiji Kajikawa 円筒面３方向螺旋相互分割方法

Also Published As

Publication number Publication date
EP3843913A1 (de) 2021-07-07
KR20210050516A (ko) 2021-05-07
WO2020043506A1 (en) 2020-03-05

Similar Documents

Publication Publication Date Title
EP3840998B1 (de) Doppelwandiger rohrabschnitt zum aufbau eines rohrsegments
US9168576B2 (en) Tower production method
EP2615226A1 (de) Stahlrohrsäule und verfahren zu ihrer herstellung
EP3843913B1 (de) Verfahren zur herstellung eines polyhedrischen schraubenförmigen rohrs und dadurch hergestelltes polyhedrisches schraubenförmiges rohr
US20190292803A1 (en) Additively manufactured tower structure and method of fabrication
EP3784543B1 (de) Rohrsegment für evakuiertes rohrtransportsystem
JP7500586B2 (ja) 真空チューブ輸送システムのチューブセクション
EP3983646B1 (de) Doppelwandiges rohrsegment und verfahren zur herstellung dieses rohrsegments
EP2581517A1 (de) Windturbinenturmabschnitt und Verfahren zur Montage eines Windturbinenturms
KR20200112849A (ko) 비워진 튜브 운송 시스템용 튜브 및 튜브 세그먼트
EP4031430B1 (de) Röhrenabschnitt für entleertes röhrentransportsystem
CN110761955A (zh) 一种预制混凝土风机塔筒
RU2052622C1 (ru) Способ изготовления башни
NO347702B1 (en) Method of manufacture of a reinforced pipe sector
WO2024022783A1 (en) Method of manufacture of a reinforced joined pipe sector
NO20220832A1 (de)
CN114987688A (zh) 一种锚链及其链环和链环的加工装置

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20210329

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20230922

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602019047828

Country of ref document: DE

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D