WO1996002363A1 - Dispositif hydraulique de mise en tension d'un boulon - Google Patents

Dispositif hydraulique de mise en tension d'un boulon Download PDF

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Publication number
WO1996002363A1
WO1996002363A1 PCT/GB1995/001617 GB9501617W WO9602363A1 WO 1996002363 A1 WO1996002363 A1 WO 1996002363A1 GB 9501617 W GB9501617 W GB 9501617W WO 9602363 A1 WO9602363 A1 WO 9602363A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
bolt
outboard
inboard
arrangement
Prior art date
Application number
PCT/GB1995/001617
Other languages
English (en)
Inventor
Mark Nicholas Sadler
Jason Philip Stevens
Original Assignee
Hydra-Tight Limited
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 Hydra-Tight Limited filed Critical Hydra-Tight Limited
Priority to JP8504788A priority Critical patent/JPH09502934A/ja
Publication of WO1996002363A1 publication Critical patent/WO1996002363A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B29/00—Accessories
    • B25B29/02—Bolt tensioners

Definitions

  • This invention relates to hydraulic bolt or stud tensioning arrangements and in particular to such arrangements of the so- called multi-layer or tandem-piston type in which a plurality of piston and cylinder arrangements have their pistons coupled to apply a large tensile stress to such a bolt or stud.
  • a plurality of annular piston and cylinder defining bodies are arranged in operation to surround coaxially an individual bolt anchored at some point thereof and able to be stretched by the arrangement at a free end, the bodies being coupled mechanically and hydraulically to each other, essentially forming a stack from an inboard piston and cylinder body, closest to an anchored part of the bolt, to an outboard piston and cylinder body furthest from the anchored part of the bolt and coupled to said free end thereof.
  • each piston extends axially to, and bears on, the next-inboard piston in addition to defining with an associated cylinder body a piston-extending chamber to which hydraulic fluid is supplied at elevated pressure to displace the piston in an outboard direction.
  • the outboard piston is mechanically coupled to said free end of the anchored bolt to which tensile stress is to be applied, directly or by way of a separate puller supported on the outboard piston, so that when hydraulic fluid is supplied to each of said piston-extending chambers the cumulative force exerted on the bolt is substantially proportional to the sum of the individual piston/chamber means.
  • tandem piston arrangement enables an effectively large piston area to be provided without unduly large piston dimensions or fluid pressure when a large force is to be exerted.
  • hydraulic fluid is supplied to a piston- retracting chamber defined outboard of the outboard piston whereby an inboardly directed force acts on the outboard piston and is likewise transmitted by abutment against each successively inboard piston in turn until they are all retracted with respect to their respective cylinder bodies.
  • tandem arrangements permit increased tensile stresses to be applied for a particular fluid pressure without even greater increase in lateral body dimensions, or for a lower fluid pressure to be used than would be the case without such tandem arrangement. Notwithstanding this, it is often necessary to constrain design, manufacture and/or usage in some way that affects, or is affected by, the requirement to supply fluid to various piston-extending chambers.
  • each passage either leading to a discrete supply pipe and pipe coupling at the exterior of the body or being aligned and communicating with corresponding ducts within the separate cylinder bodies that lead to a common supply pipe and pipe coupling for each functional chamber type.
  • tandem arrangement is essentially modular in respect of its major components, and may appear suited to final assembly, or partial dis-assembly and re-assembly, on site, the fact that in the former case, it is necessary to have sufficient clearance about the cylinder bodies to allow for such supply pipes and couplings and even confine them to a specific orientation with respect to the bolt axis, as well as with respect to each other, whilst in the latter case, there is a requirement for alignment of, and sealing between, duct interconnections between cylinder bodies both effectively inhibit assembly to the manufacturing environment.
  • a hydraulic bolt or stud tensioning arrangement of the tandem piston type in which a plurality of annular pistons within cylinder defining bodies, dimensioned to surround in operation an individual anchored bolt axis, are coupled mechanically and hydraulically in tandem from an inboard piston and cylinder body operationally closest to an anchored part of the said bolt to an outboard piston-and cylinder body furthest from said anchored part of the bolt, with each said piston defining with its associated cylinder body a piston- extending, bolt-stressing fluid chamber, is characterised by a puller bar extending along a axis common with said bolt axis, adapted at its inboard end for connection to the bolt and outboard thereof to support said inboard and outboard pistons for transmission of forces in both axial directions therebetween having a fluid passage therein extending from its outboard end to each piston-extending chamber, and piston retracting spring means disposed between said inboard piston and next outboard cylinder body operable to exert force on the inboard piston in an inboard axial direction.
  • Such piston retraction spring means acts to dispose both pistons fully retracted in their cylinder bodies in the absence of high fluid pressure in the chambers formed thereby, serving not only to expel superfluous fluid but also to facilitate the provision of carriage means affixed to the accessible outboard piston so that the tensioning arrangement may be lifted intact by way thereof and independently of side access.
  • a bolt 11 extends from a machine casing, such as a flange 12 and terminates at an end portion 13.
  • the other end of the bolt (not shown) is, or may be, anchored with respect to the flange 12 to resist axial and rotational motion of the bolt per se.
  • the end portion 13 is short in a direction measured along the longitudinal axis 14 of the bolt having such length as is necessary to engage with a nut 15 and a threaded extension piece, or puller bar, of a hydraulic tensioning arrangement.
  • a hydraulic bolt tensioning arrangement in accordance with the invention is shown at 20 and disposed operationally in relation to bolt 11.
  • the arrangement includes a puller bar 21 and an annular bridge member 22 which is arranged to straddle the nut 15 and bolt end 13 to support the tensioning arrangement on the flange 12.
  • the bridge member may include a lateral aperture 22' providing access to the nut, and possibly containing all or part of a nut turning device 23.
  • the arrangement further includes a plurality of annular pistons within cylinder defining bodies surrounding the puller bar 21 and thus, in operation, the bolt axis 14.
  • the pistons and cylinder bodies are coupled mechanically and hydraulically in tandem as will be described.
  • An inboard cylinder body 25 is formed integrally with, or mounted on, the bridge member 22, and contains, in an annular recess 26 therein, an inboard piston 27.
  • the inboard piston and cylinder body are thus operationally closest to an anchored point of the bolt, or alternatively, the flange 12.
  • An outboard cylinder body 30, containing an outboard piston 31 is mounted on, and secured to, the inboard cylinder body, therefore being furthest away in a direction along axis 14 from the anchored part of the bolt.
  • the outboard cylinder body 30 is mounted on the inboard cylinder body 25, with a lower portion 32 of the outboard body being supported coaxially within the recess 26 in the inboard body and secured thereto at annular interface 33 by screw thread engagement.
  • the puller bar extends along the axis of the tensioning arrangement through the inboard and outboard pistons, which pistons surround the puller bar and interengage therewith by means of screw threads 35, 36, or the like, respectively, thereby forces are transmitted between the pistons and puller bar in both axial directions, that is, a force exerted on any one piston is transferred into the puller bar and other piston irrespective of the axial direction of that force.
  • the inboard cylinder body 25 defines, with the inboard piston 27 a piston-extending, bolt-stressing fluid chamber 40, whilst the outboard cylinder body 30 defines, with outboard piston 31 a corresponding piston-extending chamber 41.
  • the spring means is provided conveniently and compactly by a stack of belleville washers.
  • the spring means 43 exerts an axial force on the inboard piston to bias it with respect to the cylinder body 30 to attempt to retract it into its cylinder body 25. Because of the coupling to the puller bar, the outboard piston is likewise biased to retract with respect to cylinder body 30 and the puller bar with respect to the bridge/cylinder bodies.
  • a fluid passage 50 is defined axially through the puller bar 21 from the inboard piston-extending chamber 40 to the outboard piston-extending chamber 41.
  • Coupling port 51 disposed on the longitudinal axis of the puller bar is connected by way of passage 50 and cross drillings 52, 53 to the piston-extending chambers 40 and 41 respectively.
  • Carriage means 55 shown as a lifting handle although lifting eyes or lugs could be substituted, is secured to the outboard piston 31 at 56 and by way of which the tensioning arrangement may be carried and lowered onto, or lifted from, the bolt 11.
  • the retracting spring means 42 causes the cylinder bodies and bridge to be biased with respect to the puller bar towards the outboard piston, whereby the tensioning arrangement remains intact and readily moved and disposed.
  • the arrangement is substantially symmetrical about the longitudinal axis of the puller bar.
  • the tensioning arrangement is lifted by way of the carriage means and disposed with the inboard end of the puller bar adjacent the end part 13 of the bolt, whereupon the whole arrangement is rotated by way of the carriage means to thread the end of the puller bar onto the bolt and bring the bridge 22 into abutment with the flange 12.
  • fluid supplied under pressure to the coupling 51 enters chambers 40 and 41, the fluid pressure in each chamber acting on the respective piston to cause it to move in an outboard axial direction against the resistance of the bolt exerted by way of puller bar 21.
  • the spring retracting means 43 acts to retract the pistons with respect to their respective cylinder bodies; however, as the pistons are fixed with respect to the puller bar and bolt, the cylinder bodies and integral bridge are lifted clear of the flange to effect said retraction and excess fluid expelled from the chambers 40 and 31.
  • the tensioning arrangement is thereafter unthreaded from the bolt and lifted away by way of the carriage means 55.
  • the embodiments described require access to only one end thereof for both transporting, engaging (rotating) and supplying hydraulic operating fluid, which compact arrangement makes it suited to use in environments where access to other parts is severely limited, or non-existent, such as at the bottom of a blind hole or recess.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Abstract

Dispositif hydraulique (20) de mise en tension d'un boulon, du type piston en tandem, possédant des pistons (27, 31) intérieur et extérieur, couplés mécaniquement et délimitant avec leurs corps (25 et 30) de cylindre intérieur et extérieur des chambres (40 et 41) d'extension de piston. Une barre de tirage (21) s'étendant axialement possède une extrémité interne conçue pour venir au contact du boulon (11) à mettre en tension, supporte les pistons (27 et 31) et contient un passage (50) pour fluide faisant la jonction entre les chambres. Un ressort de rappel (43) placé entre le piston intérieur et le corps de cylindre extérieur fait se rétracter les deux pistons par rapport aux corps de cylindre respectifs de ceux-ci, du fait de son couplage avec la barre de tirage. Un moyen porteur sous la forme d'un manche (55) est raccordé au piston extérieur et permet de placer le dispositif sur l'extrémité du boulon, de le tourner dans son ensemble afin de visser la barre de tirage sur le boulon, puis de l'enlever après mise en tension du boulon, le ressort de rappel des pistons permettant que tout le fluide soit purgé hors des chambres et que les composants du dispositif conservent leur intégrité.
PCT/GB1995/001617 1994-07-15 1995-07-10 Dispositif hydraulique de mise en tension d'un boulon WO1996002363A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8504788A JPH09502934A (ja) 1994-07-15 1995-07-10 油圧式ボルト引っ張り装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9414297.3 1994-07-15
GB9414297A GB2291155B (en) 1994-07-15 1994-07-15 Hydraulic bolt tensioning arrangement

Publications (1)

Publication Number Publication Date
WO1996002363A1 true WO1996002363A1 (fr) 1996-02-01

Family

ID=10758380

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001617 WO1996002363A1 (fr) 1994-07-15 1995-07-10 Dispositif hydraulique de mise en tension d'un boulon

Country Status (3)

Country Link
JP (1) JPH09502934A (fr)
GB (1) GB2291155B (fr)
WO (1) WO1996002363A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043145B3 (de) * 2004-09-03 2006-05-18 Hohmann, Jörg Hydraulische Schraubenspannvorrichtung
DE102012216579A1 (de) 2012-09-17 2014-03-20 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn
DE102012219518A1 (de) 2012-10-25 2014-04-30 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19638901C2 (de) * 1996-09-23 2000-05-25 Joerg Hohmann Hydraulische Gewindebolzenspannvorrichtung
GB9827653D0 (en) * 1998-12-17 1999-02-10 More Nicholas Hydraulic bolt tensioner
WO2006016162A1 (fr) * 2004-08-13 2006-02-16 Tentec Limited Tendeur de boulon
DE102006047512B4 (de) * 2006-10-07 2014-01-16 Man Diesel & Turbo Se Hydraulische Spannvorrichtung
DE102010017403B4 (de) 2010-06-16 2013-05-29 Ith Gmbh & Co. Kg Schraubenspannvorrichtung
DE102012109681A1 (de) * 2012-10-11 2014-04-17 Jörg Hohmann Spannvorrichtung zum Dehnen eines Gewindebolzens
CN108705486B (zh) * 2018-07-15 2023-12-29 德州德劲液压动力有限公司 一种智能拉伸器
GB2595257B (en) * 2020-05-19 2023-04-12 Acutension Ltd Bolt tensioner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008362A (en) * 1959-03-20 1961-11-14 Babcock & Wilcox Co Power operated stud tensioners
CH552448A (de) * 1971-03-26 1974-08-15 Bieri Hans Hydraulisches spannwerkzeug zur erzeugung vorgespannter schraubverbindungen.
DE2625407B1 (de) * 1976-05-13 1977-11-10 Sulzer Ag Anziehvorrichtung zum anspannen eines schraubenbolzens
DE3047674A1 (de) * 1980-12-18 1982-07-15 Hohmann, Hans, 5778 Meschede Rueckstellung, sicherheitsdeckel, endlagenbegrenzung und tragbuegel am hydraulischen schraubenanzuggeraet
WO1994014578A1 (fr) * 1992-12-23 1994-07-07 Unex Corporation Outil a commande hydraulique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837694A (en) * 1970-07-08 1974-09-24 Westinghouse Electric Corp Hydraulic head closure mechanism
DE2258859A1 (de) * 1972-12-01 1974-06-12 Masch Und Bohrgeraete Fabrik Hydraulische spannvorrichtung
FR2329414A1 (fr) * 1975-10-27 1977-05-27 Skf Cie Applic Mecanique Tendeur hydraulique a plusieurs etages pour boulons ou goujons precontraints

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008362A (en) * 1959-03-20 1961-11-14 Babcock & Wilcox Co Power operated stud tensioners
CH552448A (de) * 1971-03-26 1974-08-15 Bieri Hans Hydraulisches spannwerkzeug zur erzeugung vorgespannter schraubverbindungen.
DE2625407B1 (de) * 1976-05-13 1977-11-10 Sulzer Ag Anziehvorrichtung zum anspannen eines schraubenbolzens
DE3047674A1 (de) * 1980-12-18 1982-07-15 Hohmann, Hans, 5778 Meschede Rueckstellung, sicherheitsdeckel, endlagenbegrenzung und tragbuegel am hydraulischen schraubenanzuggeraet
WO1994014578A1 (fr) * 1992-12-23 1994-07-07 Unex Corporation Outil a commande hydraulique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043145B3 (de) * 2004-09-03 2006-05-18 Hohmann, Jörg Hydraulische Schraubenspannvorrichtung
US7661336B2 (en) 2004-09-03 2010-02-16 Jorg Hohmann Hydraulic screw tightening or tensioning device
DE102012216579A1 (de) 2012-09-17 2014-03-20 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn
DE102012219518A1 (de) 2012-10-25 2014-04-30 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn

Also Published As

Publication number Publication date
JPH09502934A (ja) 1997-03-25
GB9414297D0 (en) 1994-09-07
GB2291155A (en) 1996-01-17
GB2291155B (en) 1998-04-08

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