CH682768A5 - Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station - Google Patents

Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station Download PDF

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Publication number
CH682768A5
CH682768A5 CH6893A CH6893A CH682768A5 CH 682768 A5 CH682768 A5 CH 682768A5 CH 6893 A CH6893 A CH 6893A CH 6893 A CH6893 A CH 6893A CH 682768 A5 CH682768 A5 CH 682768A5
Authority
CH
Switzerland
Prior art keywords
measurement
rock
sensors
permanenet
fixings
Prior art date
Application number
CH6893A
Other languages
German (de)
Inventor
Hans Dietrich
Original Assignee
Dietrich Messtechnik H
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 Dietrich Messtechnik H filed Critical Dietrich Messtechnik H
Priority to CH6893A priority Critical patent/CH682768A5/en
Publication of CH682768A5 publication Critical patent/CH682768A5/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/103—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors fixed at one end of the flexible member
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/06—Measuring force or stress, in general by measuring the permanent deformation of gauges, e.g. of compressed bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0004—Force transducers adapted for mounting in a bore of the force receiving structure

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

The cables (C) from a number of measurement sensors (M) are fed together into the connecting plug (A) of a force measurement cell (K) and then connected to a measurement station via a single main cable (H). The arrangement can contain devices for measuring the temp. of the clamping head, the insulation resistance of strain gauges and of the fixing wrt. a concrete base and rock movement. USE/ADVANTAGE - E.g. for application at fixed intervals on steep rock faces to measure the anchorage force over a period of 80 years. The arrangement achievs simplified cable connection to the measurement station.

Description

1 1

CH 682 768 A5 CH 682 768 A5

2 2nd

Beschreibung description

Permanente vorgespannte Felsanker werden in bestimmten Abständen z.B an steilen Felshängen angebracht. Permanent prestressed rock anchors are installed at certain intervals, e.g. on steep rocky slopes.

Eine Auswahl dieser Felsanker ist mit Kraftmessdosen versehen. Eine Kraftmessdose ist kraftschlüssig unter dem Spannkopf des Felsankers angeordnet. Mit ihr wird die Ankerkraft gemessen. A selection of these rock anchors is provided with load cells. A load cell is non-positively arranged under the clamping head of the rock anchor. The anchor force is measured with it.

Die Ankerkraft ist der Hauptzweck der vorgespannten Felsanker. Demnach ist die Ankerkraft die wichtigste Messgrösse. Sie wird über die gesamte Gebrauchsdauer des Felsankers von z.B. 80 Jahren gemessen. The anchor force is the main purpose of the prestressed rock anchors. Accordingly, the anchor force is the most important measurement. It is used over the entire service life of the rock anchor, e.g. Measured 80 years.

Es bestehen aber in diesem Zusammenhang noch weitere Messgrössen. Es ist sinnvoll, diese auch zu erfassen. Diese helfen dem Verantwortlichen wesentlich bei der Interpretation des Kraftverlaufes während der Zeit. However, there are other parameters in this context. It makes sense to record this too. These help the person in charge to interpret the course of the force over time.

Die weitern Messgrössen beziehen sich im wesentlichen auf die sichere Funktion der Kraftmessdose, der Korrosionsgefahr für den Anker, der Feisund Bauwerksbewegungen sowie den Temperaturen. The other measurement parameters essentially relate to the safe function of the load cell, the risk of corrosion for the anchor, the iron and building movements and the temperatures.

Die Sensoren der weitern Messgrössen sind teils in der Kraftmessdose, teils in der nähern Umgebung des Felsankers angeordnet. Sie sind mit Kabel mit der Anschlussdose der Kraftmessdose verbunden. The sensors of the other measurement parameters are partly located in the load cell, partly in the vicinity of the rock anchor. They are connected by cable to the junction box of the load cell.

In der Anschiussdose werden alle Messgrössen auf das Hauptkabel geschaltet. Demnach besitzt jede Kraftmessdose ein Hauptkabel. Die Länge der Hauptkabel richtet sich nach den örtlichen Verhältnissen. Sie beträgt typisch 50 bis 150 m. In the connection box, all measurement parameters are switched to the main cable. Accordingly, each load cell has a main cable. The length of the main cable depends on the local conditions. It is typically 50 to 150 m.

Alle Hauptkabel führen zur zentralen Messstation. Diese ist gut zugänglich und in der Regel mit einem Stromanschluss versehen. All main cables lead to the central measuring station. This is easily accessible and usually has a power connection.

Mittels mobilen oder ortsfesten Anzeigegeräten werden die Messwerte angezeigt oder eventuell gespeichert und fernübertragen. The measured values are displayed or possibly saved and transmitted remotely using mobile or fixed display devices.

Es können z.B. folgende Messwerte erfasst werden: For example, the following measured values are recorded:

1. Ankerkraft 1. Anchor force

2. Temperatur des Spannkopfes 2. Temperature of the clamping head

3. Isolationswiderstand der Dehnungsmessstreifen 3. Insulation resistance of the strain gauges

4. Isolationswiderstand des Ankers zum Betonfundament 4. Insulation resistance of the anchor to the concrete foundation

5. Wasservorkommen in der Trompete 5. Water in the trumpet

6. Elektrische Potentialmessung 6. Electrical potential measurement

7. Bewegungsmessungen an Fels und Bauwerk 7. Movement measurements on rock and structure

8. Spannstahlbruch 8. Prestressing steel break

Die Vorteile dieser Erfindung sind offensichtlich: Vereinfachte Kabelführung durch Zentralisation der Einzelkabel bereits an der Quelle bei der Kraftmessdose und Führung eines einzigen Kabels zur Messstation. The advantages of this invention are obvious: simplified cable routing by centralizing the individual cables already at the source in the load cell and routing a single cable to the measuring station.

Im weitern wird der Messkomfort erhöht und Fehler beim Ablesen vermindert. Die Voraussetzung für eine Automation sind gegeben. Furthermore, the measuring comfort is increased and errors in reading are reduced. The prerequisites for automation are given.

Selbstverständlich werden nicht immer alle Messgrössen angewendet. Die Auswahl erfolgt in der Projektphase selektiv entsprechend den gegebenen Of course, not all measurements are always used. The selection is made in the project phase selectively according to the given

Umständen. Kriterien sind: Bestehende oder neue Anker, Anzahl und Grösse der Anker, Gefahrenklasse, Statik, Korrosionsgefahr usw. Circumstances. Criteria are: existing or new anchors, number and size of the anchors, hazard class, statics, risk of corrosion, etc.

Claims (1)

Patentanspruch Claim Verfahren zur dauernden Überwachung von vorgespannten permanenten Felsankern (F), dadurch gekennzeichnet, dass in der Anschlussdose (A) der Kraftmessdose (K) die Kabel (C) einer Anzahl Messfühler (M) zusammengeführt werden und in einem einzigen Hauptkabel (H) mit der Messstation (S) verbunden sind.Method for the permanent monitoring of prestressed permanent rock anchors (F), characterized in that the cables (C) of a number of sensors (M) are brought together in the junction box (A) of the load cell (K) and in a single main cable (H) with the Measuring station (S) are connected. 55 1010th 1515 2020th 2525th 3030th 3535 4040 4545 5050 5555 6060 6565 22nd
CH6893A 1993-01-12 1993-01-12 Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station CH682768A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH6893A CH682768A5 (en) 1993-01-12 1993-01-12 Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH6893A CH682768A5 (en) 1993-01-12 1993-01-12 Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station

Publications (1)

Publication Number Publication Date
CH682768A5 true CH682768A5 (en) 1993-11-15

Family

ID=4178567

Family Applications (1)

Application Number Title Priority Date Filing Date
CH6893A CH682768A5 (en) 1993-01-12 1993-01-12 Permanent monitoring of permanenet measurement fixings in rock - Involves using sensors with cables combined in force measurement cell connector and single cable to measurement station

Country Status (1)

Country Link
CH (1) CH682768A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4130389A1 (en) * 2021-08-06 2023-02-08 GLÖTZL GESELLSCHAFT FÜR BAUMESSTECHNIK mbH Force transducer, geotechnical anchor system and method for measuring the force of such an anchor system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4130389A1 (en) * 2021-08-06 2023-02-08 GLÖTZL GESELLSCHAFT FÜR BAUMESSTECHNIK mbH Force transducer, geotechnical anchor system and method for measuring the force of such an anchor system

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