WO2007139702A2 - Système et procédé de mise en tension automatique d'armatures de précontrainte monotoron - Google Patents

Système et procédé de mise en tension automatique d'armatures de précontrainte monotoron Download PDF

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Publication number
WO2007139702A2
WO2007139702A2 PCT/US2007/011736 US2007011736W WO2007139702A2 WO 2007139702 A2 WO2007139702 A2 WO 2007139702A2 US 2007011736 W US2007011736 W US 2007011736W WO 2007139702 A2 WO2007139702 A2 WO 2007139702A2
Authority
WO
WIPO (PCT)
Prior art keywords
stressing
tendon
elongation
actual
pump
Prior art date
Application number
PCT/US2007/011736
Other languages
English (en)
Other versions
WO2007139702A3 (fr
Inventor
Paul A. Hohensee
Original Assignee
Actuant Corporation
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 Actuant Corporation filed Critical Actuant Corporation
Publication of WO2007139702A2 publication Critical patent/WO2007139702A2/fr
Publication of WO2007139702A3 publication Critical patent/WO2007139702A3/fr

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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
    • E04G21/121—Construction of stressing jacks
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • This invention relates to tensioning or stressing tendons extending from a structure and, in particular, to a system and method for automatically stressing mono-strand tendons used in construction processes.
  • Concrete is a common building material that is often used to form the primary structural components of many structures.
  • mono-strand tendons are often used to strengthen the overall structure.
  • mono-strand tendons are often employed in slab-on-grade foundations, elevated parking garages, multi-story buildings, and large formed tanks to create an active reinforcement system that is generally superior to passive reinforcement systems, such as re-bar.
  • a tendon is fed through a passage formed in a portion of the structure, a stress is applied to the tendon, and the stressed tendon is secured.
  • an operator controls a hydraulic jack that pulls the tendon.
  • the operator Prior to stressing the tendon, the operator must measure the size and length of the tendon and, using the structural design requirements, determine an elongation of the tendon required to maximize reinforcement of the structure as well as the life of the tendon.
  • the operator must then relate the hydraulic pressure of the jack to the stress applied to the tendon so that the user can estimate whether the desired elongation has been achieved. Accordingly, during the stressing process, the operator must monitor the hydraulic jack to determine when it has reached a pre-determined hydraulic pressure that the operator has correlated to an amount of stress that should be applied to the tendon.
  • some hydraulic jack systems include mechanical measuring devices that are designed to measure the elongation of the tendon as it is stressed. These mechanical measuring devices typically include a counter that is rotatably incremented by the tendon as it is elongated. In this regard, the counter provides the user with a measure of the elongation.
  • These measuring systems while eliminating the need for the operator to equate the hydraulic pressure to the elongation of the tendon, require the operator to carefully monitor and control the hydraulic jack during the stressing process.
  • the present invention overcomes the aforementioned drawbacks by providing a system and method for automatically controlling a process for stressing a mono-strand tendon.
  • a user input is designed to receive a user-desired parameter indicating an amount of elongation to be applied to a tendon.
  • a processor is included that receives the user-desired parameter from the user input and automatically controls a hydraulic jack to accurately stress the mono-strand tendon according to the user-desired parameter.
  • a system for stressing a tendon includes a hydraulically actuated puller configured to grip a tendon extending from a structure.
  • a user input is included that is configured to receive a user-desired stressing parameter indicating a desired stressing magnitude or a desired stressing distance.
  • a processor receives the user-desired stressing parameter from the user input and controls actuation of the hydraulically actuated puller to apply the desired stressing magnitude or the desired stressing distance to the tendon.
  • a hydraulic stressing system includes a gripper configured to engage a tendon extending from a structure and a hydraulically actuated puller configured to pull the gripper to elongate the tendon during a stressing process.
  • a sensor is configured to determine an actual elongation of the tendon during the stressing process.
  • a user input is included that accepts a user-selected stressing parameter indicating a desired elongation of the tendon to be achieved during the stressing process.
  • the system also includes a processor that is programmed to receive the user-selected stressing parameter indicating the desired elongation of the tendon from the user input and receive feedback from the sensor indicating the actual elongation of the tendon.
  • a hydraulic stressing system includes a gripper configured to engage a tendon extending from a structure and a hydraulic jack configured to pull the gripper to elongate the tendon during a stressing process.
  • a pump is configured to provide fluid to the hydraulic jack to cause the hydraulic jack to pull the gripper and a pump sensor is provided that monitors an actual pressure applied at the pump.
  • a position sensor is included that is designed to monitor an actual elongation of the tendon during the stressing process.
  • a processor is provided to control the pump to increase the fluid provided to the hydraulic jack according to a desired pump pressure.
  • the processor receives feedback from the pump sensor indicating the actual pump pressure of the pump as well as feedback from the position sensor indicating the actual elongation of the tendon resulting from the actual pump pressure. Accordingly, the processor calculates whether any slack in the tendon has been removed using the desired pump pressure, the actual pump pressure, and the actual elongation of the tendon.
  • FIG. 1 is a perspective view of a hydraulic tensioning system in accordance with the present invention engaged with a tendon;
  • Fig. 2 is a schematic diagram of the hydraulic and electronic systems of the hydraulic tensioning system of Fig. 1;
  • FIG. 3 is a plan view of a user interface of the hydraulic tensioning system of Fig. 1 ;
  • Fig. 4 is a flowchart setting forth the steps for stressing a tendon using the hydraulic tensioning system of Fig. 1.
  • a hydraulic tensioning system 10 includes a power unit 12 and a puller 14.
  • the power unit 12 has a hydraulic pump 16, which may be a fixed displacement pump, driven by an electric motor 18 to supply hydraulic fluid under pressure through a valve 20, which may also be manually operable or, as shown, a four-way, two- position valve operated by two solenoids 21, 23.
  • the pump 16 draws fluid from a reservoir tank 22, to which fluid is returned from the puller 14 by the valve 20. In the position of the •valve 20 illustrated in Fig.
  • fluid under pressure from the pump 16 is directed to a retract port B of the puller 14 and from an advance port A of the puller 14 to the tank 22.
  • the valve 20 is shifted by the solenoids 21 ,23 to its other position, fluid under pressure from the pump 16 is directed to the advance port A of the puller 14 and from the retract port B of the puller 14 to the tank 22.
  • the system 10 also includes a pressure relief valve 24 that prevents the pressure in the retract line from exceeding a preset limit.
  • the power unit 12 also includes a pressure transducer that acts as a pump pressure sensor 26 to produce an electrical signal representative of pump pressure, which is provided to a microprocessor that acts as a controller 28.
  • the pressure sensor 26 measures the pressure upstream of the valve 20 and provides feedback to the controller 28 to determine the cycling set points of the solenoids 21, 23 and the valve 20 during normal system operation.
  • the controller 28 also receives feedback from a user input 30 and supplies information to a display 32, for example liquid crystal display (LCD) screen, that is configured to display user-desired parameters input through the user input 30 or other information output from the controller 28.
  • a display 32 for example liquid crystal display (LCD) screen
  • the controller 28 monitors operator inputs from the user input 30, torque wrench pressure as measured by the pressure sensor 26, and a variety of other system status indicators and sensors to control the system 10 and provide outputs to the display 32.
  • the controller 28, user input 30, and display 32 may all be considered part of the power unit 12, although they may be connected to the power unit 12 and to each other by cables that can be unplugged.
  • the controller 28 controls operation of the pump motor 18 and the valve 20 solenoids 21, 23 based on user-desired parameters received from the user input 30.
  • the user input 30 typically includes multiple buttons.
  • a menu button 35 is included to allow an operator to toggle between various display modes, select particular data sets to be displayed on the display 32, and select between automated or manual tensioning processes.
  • Two other buttons 36, 37 include "UP" and "DOWN” arrows, respectively, and can be used for a variety of purposes. For example, when operating in the manual mode, the UP button 36 and the DOWN button 37 provide feedback to the controller 28 indicating the direction the operator desires the puller 14 to actuate.
  • the UP button 36 and the DOWN button 37 are used to input desired stressing parameters that the controller 28 uses to automatically control the system 10.
  • the display 32 will show the current stressing parameter as a particular value, for example, a numerical indication of the desired pounds per square inch (PSI) 39 shown in Fig. 3.
  • PSI pounds per square inch
  • the display 32 may then be used to display the current operating conditions calculated by the controller 28 during the automated stressing process.
  • a power button 38 is included that operates to turn the system 10 off and on.
  • the user input 30 may be modified to include additional keys or even a complete computer keyboard for setting input parameters, calibrating, or making other settings for the system 10.
  • the puller 14 may be of any suitable type. However, it is contemplated that the puller 14 is designed for extremely rugged and heavy- duty service, for example, having a metal body 40 that houses a hydraulic cylinder 42 and a piston 44 that is slideably received in the cylinder 42 to reciprocate axially as hydraulic fluid is introduced to the cylinder 42 at either the advance A or retract B lines. The piston 44 drives a gripper 45 back and forth to pull a post or tendon 46.
  • a position sensor 48 is included within the body 40 and is positioned to monitor the tendon 46 as it is pulled from a structure 50 and elongated by the system 10.
  • the sensor may preferably be a linear variable differential transducer or displacement transducer.
  • a feedback line 52 is included to allow the sensor 48 to provide feedback to the controller 28 in order to determine when the system 10 has sufficiently stressed the tendon 46 according to the user selected parameters input through the user input 30.
  • an automated process 60 for stressing or tensioning a tendon using the above-described system starts 62 upon receiving user-desired stressing parameters and/or tendon characteristics 64.
  • this information may be input through a user interface to indicate the final parameters the user desires upon completion of the stressing or tensioning process.
  • These parameters may take various forms and may include, for example, a desired stressing magnitude or a desired stressing distance.
  • the parameters may simply include a desired elongation that the operator whishes to achieve at the outcome of the stressing process or may include a desired pressure to be applied to the tendon and/or the characteristics of the tendon.
  • the operator provides the characteristics of the tendon and construction, and relies upon the controller to calculate the desired elongation that would be appropriate for a tendon having the characteristics indicated by the operator.
  • the controller determines the specific control parameters 66 required to achieve the desired outcome.
  • the system determines whether the stress level currently applied to the tendon is negative 68. This may be achieved by analyzing the feedback provided to the controller by the pressure sensor monitoring the pressure of the hydraulic fluid in the system. The controller can engage the motor to cause the pump to increase the pressure in the system slightly. In this regard, if the increased pressure results in movement of the tendon without sufficient resistance, the controller will determine that the stress level was negative 70 as a result of slack in the tendon. The controller will then incrementally increase the pressure in the system until the tendon provides adequate resistance indicating that the slack has been removed 72.
  • the controller resets the current tendon displacement reference point to zero 74.
  • any feedback previously received from the position sensor monitoring the displacement of the tendon through the puller is disregarded. This allows the controller to control the system based on a highly accurate measurement of tendon elongation that would otherwise include errors due to the inclusion of feedback provided during the removal of slack from the tendon.
  • the system can begin stressing the tendon 78.
  • the controller continually determines whether the current stress applied to the tendon meets the desired stressing parameters entered by the operator 64 by first determining if the stress applied and/or elongation achieved is less than the desired stress/elongation 80. This determination 80 may be performed using the positioning feedback provided by the sensor monitoring the elongation of the tendon and/or using the current pressure applied to the tendon. In the latter case, the controller may use the characteristics of the tendon entered by the operator to determine whether, under the pressure levels currently being applied, the tendon should be sufficiently stressed along with the actual elongation measured by the positional sensor.
  • the controller determines that the current stress being applied has not achieved the desired stress/elongation 82, the system continues increasing the stress applied to the tendon 78 until the current stress applied/elongation achieved is not less than the desired stress/elongation 84.
  • the controller determines if the current stress/elongation is greater than the desired stress/elongation 86. If so 88, the controller reverses the system to reduce the stress applied to the tendon 90 and then determines whether the current stress/elongation is neither less than the desired stress/elongation 80, 84 nor greater than the desired stress/elongation 86. If so 92, the system has sufficiently stressed to tendon according to the user-desired stressing parameters 64 and the controller automatically ends the stressing process 94.
  • a system and method for automatically stressing/tensioning mono- strand tendons is achieved.
  • the system is capable of applying a predetermined/user-selected tension to a tendon with increased accuracy over prior art systems that rely on the operator to continuously monitor the stressing process and determine when the desired elongation has been achieved.
  • the present invention is significantly more accurate than prior art systems that do not account for removing any slack in the tendon before initiating the stressing process.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

La présente invention concerne un système et un procédé permettant de tendre des armatures de précontrainte. Le système selon l'invention comprend un dispositif de traction hydraulique conçu pour exercer un effort de traction sur une armature de précontrainte s'étendant depuis une structure, et une entrée utilisateur conçue pour recevoir un paramètre de mise en tension désiré par l'utilisateur, ledit paramètre indiquant une amplitude de mise en tension désirée et/ou une distance de mise en tension désirée. Le système comporte également un processeur configuré pour recevoir le paramètre de mise en tension désiré par l'utilisateur de l'entrée utilisateur, et pour commander le dispositif de traction hydraulique pour qu'il applique au moins l'amplitude de mise en tension désirée et/ou la distance de mise en tension désirée sur l'armature de précontrainte.
PCT/US2007/011736 2006-05-25 2007-05-16 Système et procédé de mise en tension automatique d'armatures de précontrainte monotoron WO2007139702A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/440,875 US20070271762A1 (en) 2006-05-25 2006-05-25 System and method for automatically stressing mono-strand tendons
US11/440,875 2006-05-25

Publications (2)

Publication Number Publication Date
WO2007139702A2 true WO2007139702A2 (fr) 2007-12-06
WO2007139702A3 WO2007139702A3 (fr) 2008-01-17

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PCT/US2007/011736 WO2007139702A2 (fr) 2006-05-25 2007-05-16 Système et procédé de mise en tension automatique d'armatures de précontrainte monotoron

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Country Link
US (1) US20070271762A1 (fr)
WO (1) WO2007139702A2 (fr)

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ITPC20090001A1 (it) * 2009-01-08 2010-07-09 Stefano Zambelli Dispositivo modulare per la programmazione, controllo e registrazione dei valori di tesatura di trecce e trefoli pretesi e postesi negli stabilimenti e cantieri fissi e mobili di prefabbricazione di manufatti in calcestruzzo
CN102888996B (zh) * 2012-09-29 2016-03-16 招商局重庆交通科研设计院有限公司 基于物联网的预应力施工系统
US9606709B2 (en) * 2012-12-27 2017-03-28 Google Inc. System and method for geographic data layer management in a geographic information system
DE102014105402A1 (de) * 2014-04-15 2015-10-15 Matthias Holzberger Spanneinrichtung
US9758359B2 (en) 2015-03-25 2017-09-12 K-Line Industries, Inc. Jack system
KR101643732B1 (ko) * 2015-07-29 2016-07-28 서울대학교산학협력단 포스트텐션 긴장력 컨트롤 시스템

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EP1061204A1 (fr) * 1999-06-14 2000-12-20 GTM Construction S.A. Procédé et dispositif pour tendre un câble multi-torons entre deux ancrages
WO2002020904A1 (fr) * 2000-09-08 2002-03-14 Michel Marchetti Procede de mise en tension de haubans a torons multiples

Also Published As

Publication number Publication date
WO2007139702A3 (fr) 2008-01-17
US20070271762A1 (en) 2007-11-29

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