EP2670919A1 - Method for constructing a mast for in particular off-shore wind turbines - Google Patents

Method for constructing a mast for in particular off-shore wind turbines

Info

Publication number
EP2670919A1
EP2670919A1 EP12712890.8A EP12712890A EP2670919A1 EP 2670919 A1 EP2670919 A1 EP 2670919A1 EP 12712890 A EP12712890 A EP 12712890A EP 2670919 A1 EP2670919 A1 EP 2670919A1
Authority
EP
European Patent Office
Prior art keywords
welded
struts
main pipe
pipe
mast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12712890.8A
Other languages
German (de)
French (fr)
Inventor
Rainer Spreckelmeyer
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.)
Weserwind Offshore Construction Georgsmarienhuette GmbH
Original Assignee
Weserwind Offshore Construction Georgsmarienhuette GmbH
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 Weserwind Offshore Construction Georgsmarienhuette GmbH filed Critical Weserwind Offshore Construction Georgsmarienhuette GmbH
Publication of EP2670919A1 publication Critical patent/EP2670919A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0004—Nodal points
    • 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
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • B21C37/296—Making branched pieces starting from strip material; Making branched tubes by securing a secondary tube in an opening in the undeformed wall of a principal tube
    • 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
    • E04H12/10—Truss-like structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0065—Monopile structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0091—Offshore structures for wind turbines

Definitions

  • the invention relates to a method for constructing a mast for in particular off-shore wind turbines, which consists of a main pipe and of this obliquely downwardly descending struts, the main pipe with lateral support feet
  • both the main pipe and the struts consist of pipe segments to be welded together.
  • Such a method is for example from WO
  • Pipe trusses have considerable advantages in terms of corrosion protection and flow resistance due to their continuously curved surface, which is particularly useful in off-shore applications -
  • the design of the connection of the tubular truss rods is problematic with each other.
  • Transition from the node to the nozzle connection This process is also referred to as necking.
  • the force lines in the component are not interrupted, the power flow is not disturbed.
  • the transition area can
  • the diameter of the main pipe is in the range of about 6 m while the diameter of the struts in about 2 to 4.50 m and their length up to 25 m.
  • connection between strut and main pipe is thus at a height of about 20 to 30 m.
  • TRIPOD-type masts For TRIPOD-type masts, three struts running down at an acute angle around the circumference of the mast are welded to the main pipe, which in turn are welded at the lower end to a vertical stand.
  • connection pipe strut stub
  • strut stub The pipe nodes, so the connections between strut and main pipe can be designed as pure welded joints.
  • Starting point are two cylindrical pipe segments with different diameters.
  • the smaller in diameter, involved in the connection pipe (strut stub) has a penetration, intersection or
  • Saddle contour designated form at its end. The production of such segments and this contour is described in detail in the cited document.
  • the invention solves this problem according to the characterizing part of claim 1, characterized in that the / the
  • Pipe segment / pipe segments of the main pipe, to which the respective strut is welded, is disassembled according to the number of struts to be welded into individual parts, which are placed with the curvature up on the ground, after which the welded connection of the strut with the main pipe segment / den Main pipe segments is produced and finally these items are züsartimengesch facedt again to the pipe segment, which is added to the main pipe.
  • the welded joint can be conveniently made on the ground.
  • Main tube item can only short
  • Strut stub to be welded. At this then the other required pipe segments are also welded by means of welding machines.
  • FIG. 1 shows the lower part of a TRIPOD mast 1 in this invention. It consists of the main tube 2, the laterally downgoing struts 3, which are connected at its lower end with feet 4, which in turn are connected via further struts 5 with the main tube 2.
  • the upper welded joint 7 of the struts 3 is located at a height of about 20 to 30 m.
  • the respective main pipe segments 6 are disassembled into 120 ° pieces 8. These items 8 are placed with the curvature up on the floor.
  • the strut stub 10 is connected to this item 8.

Abstract

The invention relates to a method for constructing a mast for in particular off-shore wind turbines. The mast consists of a main tube and struts that project obliquely downwards therefrom and connect the main tube to lateral pointed feet, wherein both the main tube and the struts consist of tube segments intended to be welded to each other. The method is characterised in that the tube segment(s) of the main tube to which the particular struts welded, is/are dismantled into individual parts corresponding to the number of struts to be welded on, wherein said individual parts are placed, with the curvature thereof upwards, on the ground, after which the struts are joined to the segment(s) and finally said individual parts are again welded together to form the tube segment that is joined on to the main tube.

Description

Verfahren zum Aufbau eines Mastes für insbesondere OFF-SHOBE- Windenergieanlagen  Method of constructing a mast for in particular OFF-SHOBE wind turbines
Die Erfindung betrifft ein Verfahren zum Aufbau eines Mastes für insbesondere Off-Shore-Windenergieanlagen, der aus einem Hauptrohr und von diesem schräg nach unten abgehenden Streben besteht, die das Hauptrohr mit seitlichen Stützfüßen The invention relates to a method for constructing a mast for in particular off-shore wind turbines, which consists of a main pipe and of this obliquely downwardly descending struts, the main pipe with lateral support feet
verbinden, wobei sowohl das Hauptrohr als auch die Streben aus aneinander zu schweißenden Rohrsegmenten bestehen. connect, wherein both the main pipe and the struts consist of pipe segments to be welded together.
Ein derartiges Verfahren ist beispielsweise aus der WO Such a method is for example from WO
2010/121596 bekannt. 2010/121596 known.
Darin wird ausgeführt, dass die Trag- und Gründungsstrukturen von derartigen Anlagen in aller Regel als geschweißte It states that the support and foundation structures of such facilities are usually welded
Stahlkonstruktionen ausgeführt sind. Geschweißte Steel structures are executed. welded
Stahlkonstruktionen sind typisch in Form eines Rohrfachwerks ausgeführt. Rohrfachwerke haben wegen ihrer stetig gekrümmten Oberfläche erhebliche Vorteile hinsichtlich Korrosionsschutz und Anströmwiderstand, was besonders bei Off-shore-Anwendungen zum tragen kommt- Problematisch ist jedoch die Gestaltung der Verbindung der Rohrfachwerkstäbe untereinander. Diese Steel structures are typically designed in the form of a tubular framework. Pipe trusses have considerable advantages in terms of corrosion protection and flow resistance due to their continuously curved surface, which is particularly useful in off-shore applications - However, the design of the connection of the tubular truss rods is problematic with each other. These
Verbindung wird fast ausschließlich durch Schweißen Connection is almost exclusively by welding
praktiziert. Hierdurch gelingt ein stetiger, kerbarmer practiced. This succeeds in a steady, kerbarmer
Übergang vom Knoten in den Stutzenanschluss . Dieser Vorgang wird auch als Aushalsen bezeichnet. Die Kraftlinien im Bauteil werden nicht unterbrochen, der Kraft fluss nicht gestört. Der Übergangsbereich kann Transition from the node to the nozzle connection. This process is also referred to as necking. The force lines in the component are not interrupted, the power flow is not disturbed. The transition area can
kegelförmig ausgestaltet werden. be designed cone-shaped.
Die Herstellung der Aushalsung ist eine stark handwerklich geprägte Tätigkeit. Manuelle Anpassarbeiten sind immer erforderlich. Die Herstellung wird um so schwieriger, je größer der Rohrdurchmesser ist. The production of the Aushalsung is a strong artisanal activity. Manual fitting work is always required. The production becomes more difficult, the larger the pipe diameter.
Der Durchmesser des Hauptrohres liegt im Bereich von etwa 6 m während der Durchmesser der Streben in etwa 2 bis 4,50 m beträgt und ihre Länge bis zu 25 m. The diameter of the main pipe is in the range of about 6 m while the diameter of the struts in about 2 to 4.50 m and their length up to 25 m.
Die Verbindung zwischen Strebe und Hauptrohr liegt somit in einer Höhe von etwa 20 bis 30 m. The connection between strut and main pipe is thus at a height of about 20 to 30 m.
Bei Masten vom TRIPOD-Typ sind drei um den Umfang des Mastes herum im spitzen Winkel nach unten verlaufende Streben an das Hauptrohr angeschweißt, die wiederum am unteren Ende an jeweils einem vertikal angeordneten Standfuß angeschweißt sind . For TRIPOD-type masts, three struts running down at an acute angle around the circumference of the mast are welded to the main pipe, which in turn are welded at the lower end to a vertical stand.
Die Rohrknoten, also die Verbindungen zwischen Strebe und Hauptrohr, können als reine Schweißverbindungen gestaltet werden. Ausgangspunkt sind zwei zylinderförmige Rohrsegmente mit unterschiedlichem Durchmesser. Das im Durchmesser kleinere, an der Verbindung beteiligte Rohr (Strebenstummel) besitzt eine als Durchdringungs-, Verschneidungs- oder The pipe nodes, so the connections between strut and main pipe can be designed as pure welded joints. Starting point are two cylindrical pipe segments with different diameters. The smaller in diameter, involved in the connection pipe (strut stub) has a penetration, intersection or
Sattelkontur bezeichnete Form an seinem Ende. Die Herstellung derartiger Segmente und dieser Kontur wird in der bereits zitierten Druckschrift im einzelnen beschrieben. Saddle contour designated form at its end. The production of such segments and this contour is described in detail in the cited document.
Das Verschweißen beider Rohre geschieht dabei wegen der komplizierten Geometrie von Hand, was in der großen Höhe von über 20 m in der Handhabung einerseits und bezüglich der Sicherheit andererseites Schwierigkeiten macht. The welding of both tubes happens because of the complicated geometry by hand, which in the high altitude of more than 20 m in the handling on the one hand and the safety of others on the other.
Daher liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art so zu führen, dass es sicher und weniger aufwändig durchgeführt werden kann, It is therefore the object of the invention to provide a method of the type mentioned at the outset in such a way that it can be carried out safely and with less effort,
Die Erfindung löst diese Aufgabe gemäß dem kennzeichnenden Teil des Anspruchs 1 dadurch, dass das/die The invention solves this problem according to the characterizing part of claim 1, characterized in that the / the
Rohrsegment /Rohrsegmente des Hauptrohres, an das/die jeweilige Strebe angeschweißt wird, entsprechend der anzuschweißenden Anzahl von Streben in Einzelteile zerlegt wird/werden, die mit der Krümmung nach oben auf den Boden gelegt werden, wonach die Schweißverbindung der Strebe mit dem Hauptrohrsegment/ den Hauptrohrsegmenten hergestellt wird und schließlich diese Einzelteile wieder zum Rohrsegment züsartimengeschweißt werden, welches dem Hauptrohr hinzugefügt wird.  Pipe segment / pipe segments of the main pipe, to which the respective strut is welded, is disassembled according to the number of struts to be welded into individual parts, which are placed with the curvature up on the ground, after which the welded connection of the strut with the main pipe segment / den Main pipe segments is produced and finally these items are züsartimengeschweißt again to the pipe segment, which is added to the main pipe.
Somit kann die Schweißverbindung bequem am Boden hergestellt werden. Nachdem das Hauptrohrsegment durch Zusammenschweißen der Einzelteile fertig gestellt ist, kann es dann in Thus, the welded joint can be conveniently made on the ground. After the main pipe segment has been completed by welding together the individual parts, it can then in
entsprechender Höhe mittels eines Schweißautomaten auf das bis in diese Höhe bereits fertig gestellte Hauptrohr aufgeschweißt werden . corresponding height be welded by means of a welding machine on the already up to this height asked main pipe.
Bei der Herstellung der Verbindung zwischen Strebe und In the preparation of the connection between strut and
Hauptrohr-Einzelteil können dabei lediglich kurze Main tube item can only short
Strebenstummel angeschweißt werden. An diese werden dann ebenfalls mittels Schweißautomaten die weiteren erforderlichen Rohrsegmente angeschweißt. Strut stub to be welded. At this then the other required pipe segments are also welded by means of welding machines.
Das Verfahren kann vor Ort und mit großer Sicherheit für die Mitarbeiter durchgeführt werden. In der Figur 1 ist der untere bei dieser Erfindung in Rede stehende Teil eines TRIPOD-Mastes 1 dargestellt. Er besteht aus dem Hauptrohr 2, den seitlich nach unten abgehenden Streben 3, die an ihrem unteren Ende mit Standfüßen 4 verbunden sind, die wiederum über weitere Streben 5 mit dem Hauptrohr 2 verbunden sind. The procedure can be carried out on site and with great certainty for the employees. FIG. 1 shows the lower part of a TRIPOD mast 1 in this invention. It consists of the main tube 2, the laterally downgoing struts 3, which are connected at its lower end with feet 4, which in turn are connected via further struts 5 with the main tube 2.
Wie aus der Darstellung hervorgeht, sind die Streben 3, 5 und das Hauptrohr 2 aus einzelnen zylinderförmigen oder As is apparent from the illustration, the struts 3, 5 and the main tube 2 of individual cylindrical or
konusförmigen Segmenten 6 zusammen gesetzt. cone-shaped segments 6 together.
Die obere Schweißverbindung 7 der Streben 3 befindet sich in einer Höhe von etwa 20 bis 30 m. The upper welded joint 7 of the struts 3 is located at a height of about 20 to 30 m.
Wie aus der Figur 2 hervorgeht, sind die entsprechenden Hauptrohrsegmente 6 in 120 º-Einzelteile 8 zerlegt. Diese Einzelteile 8 werden mit der Krümmung nach oben auf den Boden gelegt. Der Strebenstummel 10 wird mit diesem Einzelteil 8 verbunden. As shown in Figure 2, the respective main pipe segments 6 are disassembled into 120 ° pieces 8. These items 8 are placed with the curvature up on the floor. The strut stub 10 is connected to this item 8.
Danach werden die drei 120 °-Einzelteile 8 wieder zum Thereafter, the three 120 ° items 8 again to
Rohrsegment zusammen geschweißt und auf den bereits fertigen Teil des Hauptrohres 2 aufgeschweißt. Pipe segment welded together and welded onto the already finished part of the main pipe 2.

Claims

Patentansprüche 1. Verfahren zum Aufbau eines Mastes für insbesondere Off- shore-Windenergieanlagen, der aus einem Hauptrohr und von diesem schräg nach unten abgehenden Streben besteht, die das Hauptrohr mit seitlichen Spitzfüßen verbinden, wobei sowohl das Hauptrohr als auch die Streben aus aneinander zu schweißenden Rohrsegmenten bestehen, 1. A method for building a mast for offshore wind turbines, in particular, which consists of a main pipe and obliquely down this outgoing struts connecting the main pipe with side shanks, wherein both the main pipe and the struts to be welded together Pipe segments exist,
dadurch gekennzeichnet,  characterized,
dass das/die Rohrsegment/Rohrsegmente (6) des Hauptrohres (2) an das/die die jeweilige Strebe (3) angeschweißt wird, entsprechend der anzuschweißenden Anzahl an Streben (3) in Einzelteile (8) zerlegt wird/werden, die mit ihrer  that the pipe segment (s) (6) of the main pipe (2) to which the respective strut (3) is welded, is disassembled into individual parts (8) corresponding to the number of struts (3) to be welded
Krümmung nach oben auf den Boden gelegt werden, wonach die Verbindung der Strebe (3) mit dem Segment/den Segmenten (6) hergestellt wird und schließlich diese Einzelteile (8) wieder zum Rohrsegment zusammen geschweißt werden, welches dem Hauptrohr (2) hinzugefügt wird. 2. Verfahren nach Anspruch 1,  Curvature are placed on the ground upwards, after which the connection of the strut (3) is made with the segment / segments (6) and finally these items (8) are welded together again to the pipe segment, which is added to the main pipe (2) , 2. The method according to claim 1,
dadurch gekennzeichnet,  characterized,
dass drei 120 ° /Einzelteile (8) erzeugt werden, an die der Verbindungsstummel (10) der jeweiligen Strebe (3)  that three 120 ° / individual parts (8) are generated, to which the connecting stub (10) of the respective strut (3)
angeschweißt wird und nach dem Zusammenschweißen der drei Einzelteile (8) und dem Aufschweißen auf das Hauptrohr (2) durch Anschweißen weiterer Segmente die Strebe (3) in ihrer Gesamtlänge erzeugt wird.  is welded and after the welding together of the three items (8) and the welding on the main pipe (2) by welding other segments, the strut (3) is produced in its overall length.
EP12712890.8A 2011-02-01 2012-01-26 Method for constructing a mast for in particular off-shore wind turbines Withdrawn EP2670919A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110009995 DE102011009995A1 (en) 2011-02-01 2011-02-01 Method for constructing a mast for in particular OFF-SHORE wind turbines
PCT/DE2012/000066 WO2012103867A1 (en) 2011-02-01 2012-01-26 Method for constructing a mast for in particular off-shore wind turbines

Publications (1)

Publication Number Publication Date
EP2670919A1 true EP2670919A1 (en) 2013-12-11

Family

ID=45936588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12712890.8A Withdrawn EP2670919A1 (en) 2011-02-01 2012-01-26 Method for constructing a mast for in particular off-shore wind turbines

Country Status (3)

Country Link
EP (1) EP2670919A1 (en)
DE (1) DE102011009995A1 (en)
WO (1) WO2012103867A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012111769A1 (en) 2012-12-04 2014-06-05 Christian Hormann Method of manufacturing foundation structure for wind turbine, involves making points of tubular strut segments to lie on planes which are in manufacturing state of structure and perpendicular to longitudinal axis of central tube
NL2019701B1 (en) 2017-10-10 2019-04-15 Spt Equipment Bv Off shore wind energy installation foundation system.
WO2020227917A1 (en) * 2019-05-14 2020-11-19 江苏海上龙源风力发电有限公司 Jacket apparatus
NL2028088B1 (en) * 2020-04-29 2022-06-03 Spt Equipment Bv Concrete connector body for an offshore wind turbine.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2510656C3 (en) * 1975-03-12 1979-05-17 Ingenieur-Gemeinschaft Meerestechnik Und Seebau (Ims) Gmbh, 2000 Hamburg Process for the production of an underwater structure from parts connected to one another by screwing and welding and the formation of a joint to connect the parts
CN102414371A (en) 2009-04-23 2012-04-11 Iag马格南有限责任公司 Method for production of extra heavy pipe joints, preferably for off-shore wind energy plants

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012103867A1 *

Also Published As

Publication number Publication date
WO2012103867A1 (en) 2012-08-09
DE102011009995A1 (en) 2012-08-02

Similar Documents

Publication Publication Date Title
EP2828436B1 (en) Offshore foundation for wind energy plants with nodes bent in an arch shape
EP2670919A1 (en) Method for constructing a mast for in particular off-shore wind turbines
DE2605542C3 (en) Scaffolding for making structures
EP3208405B1 (en) Device and method for assembling tower-like structures from pre-fabricated elements
WO2006034847A1 (en) Expandable lattice support structure
DE2924677A1 (en) METHOD FOR PRODUCING LARGE TANKS
EP3208404B1 (en) Method and apparatus for mounting a pipe tower segment
EP2828523B1 (en) Offshore supporting structure for wind energy installations and framework element for same
CN105386604A (en) High altitude grid structure mounting method
DE102013015299B4 (en) Jacket for a wind turbine and method of manufacture
WO2013167101A2 (en) Stand structure
CN204531341U (en) A kind of for the passageway platform between building and construction elevator
DE3146521A1 (en) METHOD AND DEVICE FOR CREATING A LAYERED CONTAINER IN LOCATION
CN104018655B (en) A kind of assembly type monomer bracing frame
CN105464215A (en) Reverse construction method construction method of hanging structure incapable of being provided with vertical temporary support
EP0098962A1 (en) Erecting scaffold for shutterings for circular structures of concrete or the like
CN205206280U (en) Telescopic landing girder that hangs
CN210396087U (en) Drag hook is connected to outrigger bridging
DE1292364B (en) Sliding or climbing formwork for concreting structures with polygonal or curved closed floor plans
CN207003990U (en) The dismantling device of scaffold
DE3718436A1 (en) Process for producing tower-like structures
DE828152C (en) Climbing method and equipment for work scaffolding and sliding formwork
DE102012111769A1 (en) Method of manufacturing foundation structure for wind turbine, involves making points of tubular strut segments to lie on planes which are in manufacturing state of structure and perpendicular to longitudinal axis of central tube
EP2679726B1 (en) Method for the preparation of tubular structures and mounting frame
CN214575520U (en) Telescopic cantilever outer frame

Legal Events

Date Code Title Description
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: 20130823

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

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140801