EP0893551A2 - A method for preparing and for removing a strand with a weakened breaking portion - Google Patents

A method for preparing and for removing a strand with a weakened breaking portion Download PDF

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Publication number
EP0893551A2
EP0893551A2 EP98113443A EP98113443A EP0893551A2 EP 0893551 A2 EP0893551 A2 EP 0893551A2 EP 98113443 A EP98113443 A EP 98113443A EP 98113443 A EP98113443 A EP 98113443A EP 0893551 A2 EP0893551 A2 EP 0893551A2
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EP
European Patent Office
Prior art keywords
strand
wire
cut
wires
cable
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Withdrawn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
EP98113443A
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German (de)
French (fr)
Other versions
EP0893551A3 (en
Inventor
Werner Rempe
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.)
Drahtwerk Koln GmbH
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Drahtwerk Koln 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 Drahtwerk Koln GmbH filed Critical Drahtwerk Koln GmbH
Publication of EP0893551A2 publication Critical patent/EP0893551A2/en
Publication of EP0893551A3 publication Critical patent/EP0893551A3/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions

Definitions

  • the invention relates to a method for removing a Strand from its installation position and one for removal prepared strand.
  • Prestressing steel strands are used in different areas, for example for prestressed concrete bridges, but also for Slope and pit protection used.
  • slope and pit protection systems become underground installed prestressing steel strands used by means of fan, adhesive or loop anchors in the ground are attached.
  • the stranded wire must be removed from the ground after use be removed.
  • the invention is therefore based on the problem of a To create a strand that defined one in terms of breaking strength Has a predetermined breaking point and is therefore reliable can be used for preloading.
  • a strand according to claim 1 where one of the stranded wires is cut what when a certain tractive force is exceeded Break the strand in the area of the cut wire leads.
  • the problem is also solved by a method for Treatment of a strand according to claim 2, in which one the stranded wires cut, a certain tensile force is created, causing the strand to break in the area of the cut wire and the broken wire is then removed from its installation position.
  • a strand usually consists of seven tension wires. One of the tension wires runs as a heart wire in the Center and is wrapped by the remaining tension wires.
  • the heart wire of the strand is preferably severed. This prevents the separated individual wire from fanning out when putting on the train because the heart wire goes through the stranded wires surrounding it and their frictional connection in its position is held.
  • Cutting one or more tension wires allowed a defined reduction in breaking strength. So it diminishes Breaking strength when cutting a tension wire at a Strand with seven tension wires around a seventh, or around the severed cross section. Should the breaking strength around a larger proportion only have to be reduced one or more outer wires are cut. Alternatively can also use one or more wires on others Mechanically weakened cross-section.
  • the wire For access to the heart wire on the selected The wire must be opened and after cutting of the heart wire are closed again.
  • the opening and closing the wire is not a problem, since there is a known procedure for this. With Using the devices known from this area the wire can be easily opened and closed again become.
  • the method according to the invention is preferably used in Cutting the strand used so that the user Heart wire when unwinding from the coil on a chosen one Can sever position.
  • the invention is suitable for cutting the heart wire Device according to claim 7.
  • a tensioning wall 3 which has an anchoring 4 with a prestressing steel strand 6 braced against the pit wall is.
  • the prestressing steel strand 6 has after connection with an anchoring 5 in the ground and corresponding preload sufficient hold for the tensioning wall 3.
  • the designs can e.g. Single anchor A) or loop anchor B).
  • the prestressing steel strand 6 has an area 7 in which the heart wire is cut before the strand is brought forward has been. In this area 7, the strand 6 breaks when over the anchoring 4 a tension is applied to the strand, that exceeds their breaking strength in this area.
  • the Breaking strength is in the range 7 around one of the number of severed Corresponding wires reduced. Thereby the breaking strength reduction of the strand can be exactly calculate.
  • the prestressing steel strand according to the invention has thus a predetermined breaking point and yet has a defined one Breaking strength.
  • Prestressing steel strand 6 opened.
  • the device has one Opener 8, a movable pair of scissors 10 and one Normally open 11.
  • the prestressing steel strand 6 then closed again, using the outer wires the heart wire 9 in the severed area 7 then in a form-fitting manner surround.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Ropes Or Cables (AREA)

Abstract

Cables such as steel tensioning cables used for bridges etc. are removed from the positions in which they are laid by mechanical weakening. Preferably at least one of the wires (9) of the cable is mechanically weakened or cut through. Particularly the core wire of the cable is cut through. The method may be carried out using an opener (8) to open the cable, a shearing tool (10) to cut through or score a wire and a closer (11) to close the cable.

Description

Die Erfindung betrifft ein Verfahren zum Entfernen einer Litze aus ihrer Verlegeposition und eine für das Entfernen vorbereitete Litze.The invention relates to a method for removing a Strand from its installation position and one for removal prepared strand.

Spannstahllitzen werden in verschiedenen Bereichen, beispielsweise für Spannbetonbrücken, aber auch bei der Hang- und Grubensicherung eingesetzt.Prestressing steel strands are used in different areas, for example for prestressed concrete bridges, but also for Slope and pit protection used.

Insbesondere bei nicht freiliegenden Litzen besteht das Problem, die Litze, wenn sie nicht mehr gebraucht wird, aus ihrer Verlegeposition zu entfernen. Häufig ist die Litze nach dem Verlegen jedenfalls nicht mehr ohne weiteres zugänglich.This is particularly the case with non-exposed strands Problem, the stranded wire when it is no longer needed, to remove from their installation position. It is common In any case, after laying the wire, it is no longer easy accessible.

Zum Beispiel werden bei Hang- und Grubensicherungen unterirdisch verlegte Spannstahllitzen eingesetzt, die mittels Fächer-, Haft- oder Schlaufenanker im Erdreich befestigt sind.For example, slope and pit protection systems become underground installed prestressing steel strands used by means of fan, adhesive or loop anchors in the ground are attached.

Häufig muß nach Nutzungszeit die Litze aus dem Erdreich entfernt werden. Often, the stranded wire must be removed from the ground after use be removed.

Um ein aufwendiges Ausgraben der Litze zu vermeiden, ist es bekannt, in einem Bereich im Verlauf der Litze eine Sollbruchstelle durch thermische Schwächung des Spanndrahts in diesem Bereich anzulegen. Auf diese Weise kann die Litze durch Anlegen einer die Bruchkraft der Sollbruchstelle übersteigenden Zugkraft aus dem Erdreich entfernt werden. Die Litze bricht dann an der Sollbruchstelle, und kann aus ihrer Verlegeposition herausgezogen werden.In order to avoid a time-consuming digging out of the strand it is known to be in an area along the strand Predetermined breaking point due to thermal weakening of the tension wire invest in this area. That way the strand by applying the breaking strength of the predetermined breaking point traction exceeding the ground be removed. The strand breaks at the predetermined breaking point, and can be pulled out of its laying position become.

In der Praxis, insbesondere bei der Anwendung vor Ort ist wegen der großen Anzahl der zu berücksichtigenden Parameter (u.a. Ist-Messung in Induktionsgrube, gleichmäßige Erwärmung aller Litzendrähte kurzzeitig, EinflußAnalyse und Kaltumformgrad der Litzen) eine natürliche Streuung gegeben.In practice, especially when used on site is due to the large number of Parameters (e.g. actual measurement in induction pit, uniform Briefly heating all stranded wires, influence analysis and degree of cold forming of the strands) a natural one Scatter.

Dies führt zu einer wenig definierten Bruchkraft, oder zu Sicherheitszuschlägen, die die eigentliche Funktion der Litze, nämlich die Haltefunktion beeinträchtigen.This leads to a little defined breaking force, or to safety supplements that are the actual function the strand, namely impair the holding function.

Alternativ können nur überdimensionierte Litzen eingesetzt werden.Alternatively, only oversized strands can be used become.

Der Erfindung liegt daher das Problem zugrunde, eine Litze zu schaffen, die eine bezüglich der Bruchkraft definierte Sollbruchstelle aufweist und somit zuverlässig zur Vorspannung eingesetzt werden kann.The invention is therefore based on the problem of a To create a strand that defined one in terms of breaking strength Has a predetermined breaking point and is therefore reliable can be used for preloading.

Das Problem wird gelost durch eine Litze gemäß Anspruch 1, bei der einer der Litzendrähte durchtrennt ist, was bei Überschreiten einer bestimmten Zugkraft zu einem Brechen der Litze im Bereich des durchtrennten Drahtes führt.The problem is solved by a strand according to claim 1, where one of the stranded wires is cut what when a certain tractive force is exceeded Break the strand in the area of the cut wire leads.

Das Problem wird ferner gelöst durch ein Verfahren zur Behandlung einer Litze gemäß Anspruch 2, bei dem einer der Litzendrähte durchtrennt, eine bestimmte Zugkraft angelegt wird, was zu einem Brechen der Litze im Bereich des durchtrennten Drahtes führt und die gebrochene Litze daraufhin aus ihrer Verlegeposition entfernt wird.The problem is also solved by a method for Treatment of a strand according to claim 2, in which one the stranded wires cut, a certain tensile force is created, causing the strand to break in the area of the cut wire and the broken wire is then removed from its installation position.

Üblicherweise besteht eine Litze aus sieben Spanndrähten. Einer der Spanndrähte verläuft als Herzdraht im Zentrum und ist von den übrigen Spanndrähten umwickelt.A strand usually consists of seven tension wires. One of the tension wires runs as a heart wire in the Center and is wrapped by the remaining tension wires.

Um die Bruchstelle nicht nur bezüglich ihrer Bruchkraft, sondern auch bezüglich ihrer Position zu definieren, wird vorzugsweise der Herzdraht der Litze durchtrennt. Dies verhindert ein Auffächern des getrennten Einzeldrahtes beim Anlegen des Zuges, da der Herzdraht durch die ihn umgebenden Litzendrähte und deren Reibschluß in seiner Position gehalten wird.Not only about the breaking point, but also to define their position, the heart wire of the strand is preferably severed. This prevents the separated individual wire from fanning out when putting on the train because the heart wire goes through the stranded wires surrounding it and their frictional connection in its position is held.

Das Durchtrennen eines oder mehrerer Spanndrähte erlaubt eine definierte Bruchkraftminderung. So mindert sich die Bruchkraft beim Durchtrennen eines Spanndrahtes bei einer Litze mit sieben Spanndrähten um ein Siebentel, bzw. um den durchtrennten Querschnitt. Soll die Bruchkraft um einen größeren Anteil gemindert werden, müssen lediglich ein oder mehrere Außendrähte durchtrennt werden. Alternativ können auch ein oder mehrere Drähte auf andere Weise mechanisch querschnittsgeschwächt werden. Cutting one or more tension wires allowed a defined reduction in breaking strength. So it diminishes Breaking strength when cutting a tension wire at a Strand with seven tension wires around a seventh, or around the severed cross section. Should the breaking strength around a larger proportion only have to be reduced one or more outer wires are cut. Alternatively can also use one or more wires on others Mechanically weakened cross-section.

Für den Zugriff auf den Herzdraht an der gewählten Stelle muß die Litze geöffnet und nach dem Durchtrennen des Herzdrahtes wieder geschlossen werden. Das Öffnen und Schließen der Litze bereitet jedoch keine Probleme, da sich dafür ein bekanntes Verfahren anbietet. Mit Hilfe der aus diesem Bereich bekannten Vorrichtungen kann die Litze ohne weiteres geöffnet und wieder geschlossen werden.For access to the heart wire on the selected The wire must be opened and after cutting of the heart wire are closed again. The opening and closing the wire is not a problem, since there is a known procedure for this. With Using the devices known from this area the wire can be easily opened and closed again become.

Vorzugsweise wird das erfindungsgemäße Verfahren beim Ablängen der Litze eingesetzt, so daß der Anwender den Herzdraht beim Abwickeln vom Coil an einer von ihm gewählten Position durchtrennen kann.The method according to the invention is preferably used in Cutting the strand used so that the user Heart wire when unwinding from the coil on a chosen one Can sever position.

Zum Durchtrennen des Herzdrahtes eignet sich die erfindungsgemäße Vorrichtung gemäß Anspruch 7.The invention is suitable for cutting the heart wire Device according to claim 7.

Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:

Fig. 1
einen schematischen Verlauf eines unterirdisch verlegten Spanndrahtes,
Fig. 2
eine geöffnete Sitze mit freigelegtem Herzdraht und erfindungsgemäßer Trennvorrichtung.
The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing. The drawing shows:
Fig. 1
a schematic course of an underground tension wire,
Fig. 2
an open seats with exposed heart wire and inventive separation device.

An einer Grubenwand 1 mit zu sicherndem Gut 2 befindet sich eine Spannwand 3, die über eine Verankerung 4 mit einer Spannstahllitze 6 gegen die Grubenwand verspannt ist. Die Spannstahllitze 6 besitzt nach Verbindung mit einer Verankerung 5 im Erdreich und entsprechender Vorspannung einen ausreichenden Halt für die Spannwand 3. Die Ausführungen können z.B. Einzelanker A) oder Schlaufenanker B) sein.Located on a pit wall 1 with goods 2 to be secured a tensioning wall 3, which has an anchoring 4 with a prestressing steel strand 6 braced against the pit wall is. The prestressing steel strand 6 has after connection with an anchoring 5 in the ground and corresponding preload sufficient hold for the tensioning wall 3. The designs can e.g. Single anchor A) or loop anchor B).

Die Spannstahllitze 6 besitzt einen Bereich 7, in dem der Herzdraht vor dem Vorbringen der Litze durchtrennt wurde. In diesem Bereich 7 bricht die Litze 6, wenn über die Verankerung 4 ein Zug an der Litze angelegt wird, der deren Bruchkraft in diesem Bereich übersteigt. Die Bruchkraft ist im Bereich 7 um einen der Zahl der durchtrennten Drähte entsprechenden Anteil vermindert. Dadurch läßt sich die Bruchkraftminderung der Litze genau errechnen. Die erfindungsgemäße Spannstahllitze besitzt somit eine Sollbruchstelle und weist dennoch eine definierte Bruchkraft auf.The prestressing steel strand 6 has an area 7 in which the heart wire is cut before the strand is brought forward has been. In this area 7, the strand 6 breaks when over the anchoring 4 a tension is applied to the strand, that exceeds their breaking strength in this area. The Breaking strength is in the range 7 around one of the number of severed Corresponding wires reduced. Thereby the breaking strength reduction of the strand can be exactly calculate. The prestressing steel strand according to the invention has thus a predetermined breaking point and yet has a defined one Breaking strength.

Mit Hilfe der erfindungsgemäßen Vorrichtung wird die Spannstahllitze 6 geöffnet. Die Vorrichtung besitzt einen Öffner 8, eine verfahrbare Schere 10 und einen Schließer 11. Sobald der Herzdraht 9 an dem als Sollbruchstelle vorgewählten Bereich 7 freiliegt, kann dieser mit Hilfe der verfahrbaren Schere 10 durchtrennt werden. Mit Hilfe des Schließers 11 wird die Spannstahllitze 6 dann wieder geschlossen, wobei die Außendrähte den Herzdraht 9 im durchtrennten Bereich 7 dann formschlüssig umgeben.With the help of the device according to the invention Prestressing steel strand 6 opened. The device has one Opener 8, a movable pair of scissors 10 and one Normally open 11. As soon as the heart wire 9 at the as a predetermined breaking point preselected area 7 can be exposed severed with the help of the movable scissors 10 become. With the help of the closer 11, the prestressing steel strand 6 then closed again, using the outer wires the heart wire 9 in the severed area 7 then in a form-fitting manner surround.

Claims (7)

Verfahren zum Entfernen einer Litze aus ihrer Verlegeposition, bei dem die Litze (6) mechanisch geschwächt wird und ein Zug an die Litze (6) angelegt wird, der die Bruchkraft der Litze im Bereich der Schwächung (7) übersteigt.Method of removing a strand from its laying position where the strand (6) is mechanically weakened and a train is applied to the strand (6) the breaking strength of the strand in the area of the Weakening (7) exceeds. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß einer der Drähte (9) der Litze (6) durchtrennt oder mechanisch geschwächt wird.A method according to claim 1, characterized in that one of the wires (9) of the strand (6) is cut or mechanically weakened. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Herzdraht (9) der Litze (6) durchtrennt wird.A method according to claim 1, characterized in that the heart wire (9) of the strand (6) is cut. Aus ihrer Verlegeposition entfernbare mechanisch geschwächte Sitze. Mechanically removable from its installation position weakened seats. Litze nach Anspruch 4, dadurch gekennzeichnet, daß mindestens einer der Drähte (9) der Litze (6) mechanisch geschwächt oder durchtrennt wird.Strand according to claim 4, characterized in that at least one of the wires (9) of the strand (6) is mechanically weakened or severed. Litze nach Anspruch 4, dadurch gekennzeichnet, daß der Herzdraht (9) der Litze (6) durchtrennt wird.Strand according to claim 4, characterized in that the heart wire (9) of the strand (6) is severed. Vorrichtung zur Schwächung einer Litze gemäß Anspruch 4,5 oder 6 mit einem Öffner (8) zum Öffnen der Litze, einer Schere (10) zum Durchtrennen oder Anritzen eines Drahtes (9) der Litze (6) und einem Schließer (11) zum Schließen der Sitze.Device for weakening a strand according to claim 4,5 or 6 with an opener (8) for opening the strand, a pair of scissors (10) for cutting or Scoring a wire (9) of the strand (6) and one Closer (11) for closing the seats.
EP98113443A 1997-07-25 1998-07-18 A method for preparing and for removing a strand with a weakened breaking portion Withdrawn EP0893551A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732023 1997-07-25
DE1997132023 DE19732023A1 (en) 1997-07-25 1997-07-25 Method of making and removing a strand with a predetermined breaking point

Publications (2)

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EP0893551A2 true EP0893551A2 (en) 1999-01-27
EP0893551A3 EP0893551A3 (en) 2000-06-07

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EP98113443A Withdrawn EP0893551A3 (en) 1997-07-25 1998-07-18 A method for preparing and for removing a strand with a weakened breaking portion

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6447909B1 (en) 1999-01-14 2002-09-10 Sumitomo Metal Mining Co., Ltd. Transparent conductive layered structure and method of producing the same, and coating liquid for forming transparent conductive layer used in production of transparent conductive layered structure and method of producing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899892A (en) * 1973-02-08 1975-08-19 Ichise Yoshio Steel cable anchor and method for withdrawing the same
EP0163479A2 (en) * 1984-05-22 1985-12-04 Helix Cables International Pty. Ltd. Ground control
US4652179A (en) * 1983-01-13 1987-03-24 Dyckerhoff & Widmann Aktiengesellschaft Method of and device for severing a tension member in a prestressed grouted anchor
US4884377A (en) * 1986-04-28 1989-12-05 Vsl International Ag. Removable tension member
US5113634A (en) * 1988-07-06 1992-05-19 Vsl International Ag Method of producing a tension part anchorable in the earth

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899892A (en) * 1973-02-08 1975-08-19 Ichise Yoshio Steel cable anchor and method for withdrawing the same
US4652179A (en) * 1983-01-13 1987-03-24 Dyckerhoff & Widmann Aktiengesellschaft Method of and device for severing a tension member in a prestressed grouted anchor
EP0163479A2 (en) * 1984-05-22 1985-12-04 Helix Cables International Pty. Ltd. Ground control
US4884377A (en) * 1986-04-28 1989-12-05 Vsl International Ag. Removable tension member
US5113634A (en) * 1988-07-06 1992-05-19 Vsl International Ag Method of producing a tension part anchorable in the earth

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6447909B1 (en) 1999-01-14 2002-09-10 Sumitomo Metal Mining Co., Ltd. Transparent conductive layered structure and method of producing the same, and coating liquid for forming transparent conductive layer used in production of transparent conductive layered structure and method of producing the same
US6489029B1 (en) 1999-01-14 2002-12-03 Sumitomo Metal Mining Co., Ltd. Transparent conductive layered structure and method of producing the same, and coating liquid for forming transparent conductive layer used in production of transparent conductive layered structure and method of producing the same
US6528112B2 (en) 1999-01-14 2003-03-04 Sumitomo Metal Mining Co., Ltd. Transparent conductive layered structure and method of producing the same, and coating liquid for forming transparent conductive layer used in production of transparent conductive layered structure and method of producing the same

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Publication number Publication date
DE19732023A1 (en) 1999-01-28
EP0893551A3 (en) 2000-06-07

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