EP0715040A1 - Dispositif de coupe pour enrolages - Google Patents

Dispositif de coupe pour enrolages Download PDF

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Publication number
EP0715040A1
EP0715040A1 EP95118731A EP95118731A EP0715040A1 EP 0715040 A1 EP0715040 A1 EP 0715040A1 EP 95118731 A EP95118731 A EP 95118731A EP 95118731 A EP95118731 A EP 95118731A EP 0715040 A1 EP0715040 A1 EP 0715040A1
Authority
EP
European Patent Office
Prior art keywords
knife
tendon
housing
arm
cutting edge
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.)
Granted
Application number
EP95118731A
Other languages
German (de)
English (en)
Other versions
EP0715040B1 (fr
Inventor
Daniel P. Kenny
Donald J. Singer
Gerhard G. Kast
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.)
DYWIDAG-Systems International GmbH
Walter Bau AG
Original Assignee
Dyckerhoff and Widmann AG
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 Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Publication of EP0715040A1 publication Critical patent/EP0715040A1/fr
Application granted granted Critical
Publication of EP0715040B1 publication Critical patent/EP0715040B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/924—Work wrapped or coated around a core, not part of the machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/929—Particular nature of work or product
    • Y10S83/947—Particular nature of work or product insulation about wire
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/667—Tool carrier or guide affixed to work during cutting
    • Y10T83/68—Entirely work supported

Definitions

  • the invention relates to devices that are used for tensioning components that are subjected to tension or compression, and in particular to devices for cutting open sheathing on tendons that are arranged in a component before tension is exerted on them.
  • Structures e.g. Constructions made of concrete can be reinforced or reinforced by using post-tensioning elements.
  • This type of reinforcement uses one or more high tensile tendons that are tensioned after a hardening material, e.g. Concrete, is brought in and could harden around it.
  • Tendons can also be used to reinforce steel structures, e.g. Trusses, for rock and earth anchors and other tensile agents.
  • Tendons are often covered with a plastic sheathing, often made of polyethylene. Usually the space between the tendon and the sheathing is covered with grease or grease-like compounds, e.g. Micro wax, filled.
  • the grease-filled casing serves two purposes: to protect the tendon against corrosion and also to keep it free to move in the hardened concrete.
  • a sheathed tendon of this type is used to reinforce a concrete component with subsequent prestressing
  • the sheathed tendon is usually installed on the construction site of the building and initially held in a slack position, suspended between two anchoring bodies or devices, while the concrete is being placed around it.
  • a tensile device for example a tensioning press
  • anchoring wedges or other holding means are inserted between the tendon and the anchoring body or the anchoring device in order to fix the tendon and to maintain the required tensile stress. Then the clamping press is removed.
  • the plastic jacket Before attaching a clamping press, the plastic jacket must be removed from the end of the tendon so that the clamping jaws of the clamping press and the anchoring wedges can directly touch and firmly grip the tendon.
  • the sheath was removed before the tendon was inserted into the anchors, usually well before the concrete was inserted into the component.
  • the unclamped end of the tendon may be exposed to the weather for a few days to a few weeks before the preload is applied so that it can corrode.
  • the casing can be removed after the tendon has been inserted into the anchoring device.
  • the removal can at least be difficult.
  • the invention has for its object to eliminate one or some of the difficulties mentioned.
  • a device for cutting open the casing on a tendon which in a Anchoring device is attached to a knife holder and a knife with a cutting edge.
  • the cutting edge contacts the jacket.
  • the cutting edge cuts the casing at a preselected location within the anchoring device when the knife holder is rotated around the tendon.
  • the knife holder has a housing which can be rotatably arranged on a section of the tensioning member, and a mechanism for fastening the knife to the housing.
  • the knife contacts an inner wall of the anchoring device and bends the cutting edge toward the tendon until it contacts the jacket.
  • the cutting edge cuts the casing at a preselected point when the housing is rotated around the tendon.
  • the housing has features, such as an inner wall that defines an opening.
  • the inner wall partially surrounds the jacketed tendon when the device is mounted thereon.
  • the housing is a front section with a conical outer surface.
  • the conical surface contacts the inner wall of the anchoring device to bring about a coaxial alignment between the housing and the tendon.
  • the housing can have a practically cylindrical section arranged on the front part, and the mechanism for holding the knife is located within this cylindrical section.
  • the mechanism for fastening the knife preferably represents a knife holding and extending mechanism which can be brought into a first and a second position. When the mechanics are in their first position, the cutting edge of the knife is inside the housing. When the mechanism is in the second position, the cutting edge protrudes outward from the housing and is in a cutting position.
  • the housing has a slot in its front section, through which the knife protrudes when the mechanism has assumed its second position.
  • the mechanism also automatically returns from the second position to the first position when the device is removed from the tendon.
  • one embodiment of the knife holder and cutting mechanism has a first and a second arm, which are connected to one another by a tension spring, the spring pulling the first arm toward the second arm.
  • the first arm is rotatably attached to the housing and the second arm is rotatably attached to the first arm and to a knife holder slidably on the housing.
  • the knife is firmly attached to the knife holder.
  • the first or the second arm pushes or pushes both arms against the covered tendon and moves or shifts the knife into the selected cutting position when the knife holding and extending mechanism is in the second position.
  • the knife holder has a first and a second side part
  • the housing has a first and a second groove, the first and the second side part being slidably displaceable in the first and the second groove, respectively.
  • the knife contacts an inner wall of the anchoring device and directs the cutting edge toward the tendon in contact with the jacket.
  • the cutting edge cuts the casing at a predetermined point when the housing is rotated around the tendon.
  • the housing has an inner wall surface that defines an opening. The inner wall surface partially surrounds the jacketed tendon when the device is attached to the tendon.
  • the device also has an elongated knife with a flat part and a cutting edge as well as a mechanism attached to the housing and firmly connected to the knife for holding the knife and for extending the knife.
  • the mechanism assumes a first position, in which the cutting edge of the knife is inside the housing, and a second position, in which the cutting edge of the knife protrudes from the housing and assumes a predetermined cutting position.
  • the mechanism is in the second position and the knife surface contacts an inner wall of the anchoring device, whereby the cutting edge is deflected towards the tendon and brought into contact with the casing.
  • the cutting edge cuts the casing at a preselected point when the housing is rotated around the tendon.
  • a device according to the invention for cutting open a casing 14 of a tendon 16 in a wedging opening 18 of an anchoring device 20 by means of an elongated housing 23 has means for receiving a knife, a knife 25 and further means for holding the knife 25, represented by a hat holding and extending mechanism designated overall by 27.
  • a "tendon" of the type described here includes both single-strand and multi-strand tendons that can be used for a variety of applications for reinforcing or reinforcing concrete parts. Such applications also include, but are not limited to, rock and ground anchors, and tension members.
  • the elongate housing 23 of the device 11 has a substantially conical front end part 29 and essentially cylindrical main and rear sections 31 and 33, respectively.
  • Fig. 7 shows that a slot 35 is provided on the front end piece 29, from which the knife 25 emerges.
  • 29 outer surfaces 37, 39 and 41 are to be distinguished on the front end part, each are bevelled or conical, and a collar 43 with a substantially flat surface 45 which is connected to the surface 41.
  • the front end part 29 is intended to cooperate with the anchoring device 20 such that the outer surfaces 37 and 41 touch a conical inner surface or wall 48 which forms the wedging opening 18 of the device 20.
  • the flat surface 45 bears against one end 50 of the anchoring device 20 when the device 11 is in the cutting position, as a result of which the housing 23 is essentially coaxial with the tensioning member 16.
  • the front end part 29 is connected to the main part 31 of the housing 23 on the collar 43.
  • the main part 31 has a substantially cylindrical outer surface 51 and is structurally connected to the rear housing part 33, which has an outer surface 53.
  • the outer surface 53 has longitudinal grooves 55 which make it easier for the user to hold the device 11 in use.
  • the front end part 29, the main part 31 and the rear part 33 of the housing 23 are hollow and have surfaces which form a slot-shaped opening 57, the width of which is greater than the diameter of a covered tendon 16, the Sheathing to be cut open by the device 11.
  • an inner surface 59 of the front conical part 29 of the housing 23 has a substantially U-shape, in which the radius of curvature of a bent section 61 is somewhat larger than the radius of a tendon 16 surrounded by a casing 14 8 to 10 show, the main part 31 and the rear part 33 have an inner surface 63 which is substantially rectangular in shape and has a substantially flat contact surface 65 which can lie against the casing 14 of the tendon 16.
  • the knife holding and extending mechanism 27 is accommodated within the main part 31 of the housing 11.
  • the mechanism 27 comprises a block-shaped knife holder 67, a first and a second articulated arm 71 and 73 and a tension spring 75 stretched between the two.
  • the knife holder 67 consists of a front part 77, a rear part 79 and side parts 81 structurally connected to the rear part 79.
  • the front part 77 has a recess 83, into which the knife 25 is received, and a threaded bore 85, into which one Hexagon socket set screw 87 is turned, which lies against the knife 25 and holds it in the recess.
  • the knife 25 consists of an elongated body 89 with a rear end 91, a top 93, a front end 95, a cutting edge 97 and a puncture tip 98.
  • the recess 83 of the knife holder 67 is inclined against the longitudinal axis of the main housing part 31, as a result of which the knife body 89 runs in practically the same direction as the inclined surfaces 37, 39 and 41 of the front piece 29.
  • Fig. 8 shows on the main housing part 31 grooves 99, in which the side parts 81 of the knife holder 67 are slidable.
  • the knife holder 67 is thus received in the housing part 31 and can be moved in the longitudinal direction of the housing 23.
  • the arm 71 is pivotally attached to the rear part 79 of the knife holder.
  • the rear part 79 has two bearing parts 101 and 103, each of which has a bore (not shown) through which a bolt 105 is inserted.
  • a front part 107 of the arm 71 lies between the bearing parts 101 and 103 and has also a bore (not shown) through which the bolt 105 runs.
  • the arm 71 is articulated with its rear part 109 to a front part 111 of the arm 73.
  • the front part 111 of the arm 73 has two bearing parts 113 and 115, each of which contains a bore (not shown) through which a bolt 117 is inserted is.
  • the rear part of the arm 71 lies between the bearing parts 101 and 103 and also has a bore (not shown) through which the bolt 117 runs.
  • the arm 73 has a rear part 119, which is pivotably connected to the main housing part 31 by means of a bolt 121.
  • a recess 123 is provided in the main housing part 31, in which the rear part 119 is accommodated.
  • the bolt 121 leads through the bores 125 and 127 of the housing and a bore 129 in the rear part 119.
  • the bolt 121 is held in the bores 125 and 127 of the housing 31 by means of an Allen screw 131.
  • each arm 71 and 73 has a recess 133 and 135 on their upper side, the width of which is greater than the diameter of the spring 75.
  • Each arm 71 and 73 also has a recess 137 and 139, which extend transversely to the recesses 133 and 135 and lie between the center of each arm and one end 141 and 143, respectively.
  • the two arms 71 and 73 also have a longitudinal rod 145 and 147, which runs transversely to the recess and defines an opening 149 and 151, respectively.
  • Eyes 153 and 155 formed on the tension spring 75 lead through the openings 149 and 151 and are hooked around the rods 145 and 147, as a result of which the spring 75 with the arms 71 and 73 connected is.
  • the spring 75 pulls the knife holder 67 towards the rear part 33 of the housing 23.
  • the cutting device 11 can be made of hardened tool steel or other suitable, wear-resistant materials.
  • the tendon 16 enclosed by the casing 14 is placed on the site of a component (e.g. a concrete component) and inserted into the anchoring device 20. At the opposite end, the tendon 16 is attached to a further anchoring device (not shown); the tendon 16 is tensioned to avoid sagging. After the concrete or other hardening material has been introduced and hardened, the part of the casing 14 protruding beyond the anchoring device 20 must be removed in order to expose the tendon 16 so that it can be tensioned.
  • the device 11 according to the invention serves to remove the casing 14.
  • the device 11 is placed on the jacketed tendon 16 at a freely selectable location, advantageously in the vicinity of the anchoring device 20, in order to ensure that the jacket 14 can be removed in the immediate vicinity of the area in which the conical inside 48 of the anchoring device 20 reaches close to the covered tendon 16. With the removal of the sheathing at such a location, it is ensured that a tensioning device (not shown) can then be clamped on an unclad tendon or a group of unclad tendons, and it is also ensured that there is sufficient frictional engagement between the unclad tendon and the anchoring wedges between the tendon and of the anchoring device 20 after the prescribed tensile force has been applied.
  • the operation of the cutting device 11 can be explained with reference to FIGS. 1 to 4. 1 and 2, the device 11 is brought to one side of a tendon 16, with the oblique front part 29 of the device directed against the anchoring device 20, the opening 57 (see FIG. 7) of the housing to the tendon 16 is facing. At this time, the knife 25 is in the withdrawn position, the front knife end 95 being in the front oblique part 29 of the housing 23.
  • the knife holding and extending mechanism 27 is in a first angled position with the spring 75 pulling the front end 107 of the arm 71 against the rear end 119 of the arm 73.
  • the device 11 is then moved in the direction of the tendon 16 until the inner surfaces 59 and 63 partially surround the tendon 16 and the surface 65 lies on the casing 14 of the tendon 16.
  • the arm 71 contacts the jacket 14 and the rear part 109 of the arm 71 is moved towards the spring 75, whereby the front part 107 of the arm 71 is extended in the longitudinal direction the front housing part 29 is moved.
  • the arm 71 and the front part 111 of the arm 73 contact the casing 14 and are moved towards the housing main part 31, and the side parts 81 are pushed forward in the grooves 99, whereby the knife 25 is moved forward so that the front end 95 of the knife and part of the knife body 89 in the slot 35 disappear.
  • the spring 75 occurs when the housing contact surface 65 (cf. FIG. 9) contacts the casing 14 and the arms 71 and 73 are fully extended in the longitudinal direction into the slots 133 and 135, and the knife holding and extending mechanism 27 is in a second, extended position.
  • the knife 25 is in an intended cutting position.
  • the knife 89 is located within the slot 35, while the top 93 of the knife stands outside the outer surfaces 37, 39 and 41 of the housing part 29 and the front end 95 of the knife 25 and the piercing tip 98 protrude from the part 29 which is beveled forward the anchoring assembly 20 are directed.
  • the cutting edge 97 is close to the casing 14 or lies against it; however, the tip 98 does not yet penetrate into the casing 14.
  • the device 11 is pushed along the jacketed tendon 16 in the direction of the anchoring device 20 in the sense indicated by the arrow 160 in FIG. 2 until the flat surface 45 of the collar 43 lies against the end 50 of the anchoring device 20, as shown in Fig. 3.
  • the front part 29 of the housing 23 enters the wedging opening 18, which is defined by the conical inner surface 48 of the anchoring device 20, the upper side 93 of the knife 25 contacts the conical surface 48.
  • Some anchoring devices have an annular sealing member (not shown) between the tendon 16 and the surface 48 at or near 162 where the surface 48 approaches the tendon 16.
  • a device 11 according to the invention can be designed such that the knife cutting edge 97 is brought into a predetermined piercing / cutting position as required at a point in the vicinity of such a seal or abutting it.
  • the device 11 After the device 11 has been rotated about the tensioning member 16, the device is moved in a direction indicated by an arrow 166 in FIG. 4, as a result of which the knife edge 97 can return to its original position, lifted off the casing. Then the device 11 is removed from the tendon 16.
  • the spring 75 presses the arm part 107 against the arm part 119, as a result of which the knife holder 67 is pushed backwards towards the rear housing part 33 and the knife 25 is returned to the withdrawn position.
  • the casing 14 is then removed from the tendon 16 by being pushed in the direction of arrow 166 in FIG. 4 and over the end of the tendon 16.
  • a fast, uncomplicated and effective means for separating a sheathing from a tendon and at a point within the recess of an anchoring device is specified.
  • Excellent corrosion protection of the tendon is achieved because the casing protects the tendon until immediately before the step of tensioning the tendon. After tensioning, the sheathing can be pulled back onto the tendon so that corrosion protection is still provided.
  • a device according to the invention advantageously works together with the existing anchoring bodies or devices, which typically have conical inner walls, in that a knife is provided which bends towards the casing and cuts through the casing when the knife touches the inner wall.
  • the invention is not limited to the use of a cutting knife deflected from a wall to cut open the sheath.
  • the device can be equipped with a knife, which takes a fixed position, for use in anchoring devices with wide or non-conical locking wedge openings.
  • the feed and return mechanism described here can be dispensed with.
  • the invention therefore does not necessarily have to be equipped with such a mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
EP95118731A 1994-12-02 1995-11-29 Dispositif de coupe pour enrobages Expired - Lifetime EP0715040B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US34904594A 1994-12-02 1994-12-02
US349045 1994-12-02

Publications (2)

Publication Number Publication Date
EP0715040A1 true EP0715040A1 (fr) 1996-06-05
EP0715040B1 EP0715040B1 (fr) 1998-09-23

Family

ID=23370683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95118731A Expired - Lifetime EP0715040B1 (fr) 1994-12-02 1995-11-29 Dispositif de coupe pour enrobages

Country Status (5)

Country Link
US (1) US5745996A (fr)
EP (1) EP0715040B1 (fr)
CA (1) CA2163063C (fr)
DE (1) DE59503688D1 (fr)
MX (1) MX9504747A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896108A2 (fr) * 1997-08-05 1999-02-10 Dyckerhoff & Widmann Aktiengesellschaft Procédé de pose et de mise en tension d'un membre de précontrainte libre, et dispositif pour la mise en oeuvre du procédé

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US6311600B1 (en) * 1999-10-20 2001-11-06 Hong Kong Polytechnic University Electric power cable sheath cutter
US6739229B2 (en) 2002-06-19 2004-05-25 Thomas D. Scollon Cable stripping device
JP2005218212A (ja) * 2004-01-29 2005-08-11 Yazaki Corp 編組の切断装置
US7243429B2 (en) * 2005-03-23 2007-07-17 Landes Mark J Wire stripper systems
US7316058B2 (en) * 2005-08-15 2008-01-08 Beam-Chi Jee Coaxial cable stripper
US8443520B2 (en) * 2008-09-09 2013-05-21 Kyle Viereck Device for stripping sheathing on unbonded post-tensioning tendons
US9517332B2 (en) 2011-01-27 2016-12-13 Medtronic, Inc. Anchors including rigid bodies defining full length slots for use with implantable medical leads
US9615823B2 (en) 2011-01-27 2017-04-11 Medtronic, Inc. Tools and methods for removing anchors from medical leads

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EP0146397A2 (fr) * 1983-12-20 1985-06-26 Vasilije Kokotovich Dispositif dénudeur de fil

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528635A1 (fr) * 1982-06-14 1983-12-16 Krampe Josef Outil de denudage
EP0146397A2 (fr) * 1983-12-20 1985-06-26 Vasilije Kokotovich Dispositif dénudeur de fil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896108A2 (fr) * 1997-08-05 1999-02-10 Dyckerhoff & Widmann Aktiengesellschaft Procédé de pose et de mise en tension d'un membre de précontrainte libre, et dispositif pour la mise en oeuvre du procédé
EP0896108A3 (fr) * 1997-08-05 2000-09-27 Dyckerhoff & Widmann Aktiengesellschaft Procédé de pose et de mise en tension d'un membre de précontrainte libre, et dispositif pour la mise en oeuvre du procédé

Also Published As

Publication number Publication date
MX9504747A (es) 1997-05-31
CA2163063A1 (fr) 1996-06-03
US5745996A (en) 1998-05-05
CA2163063C (fr) 1998-08-11
EP0715040B1 (fr) 1998-09-23
DE59503688D1 (de) 1998-10-29

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