EP0855472A1 - Method of installing a cut-off wall in the soil - Google Patents

Method of installing a cut-off wall in the soil Download PDF

Info

Publication number
EP0855472A1
EP0855472A1 EP98200213A EP98200213A EP0855472A1 EP 0855472 A1 EP0855472 A1 EP 0855472A1 EP 98200213 A EP98200213 A EP 98200213A EP 98200213 A EP98200213 A EP 98200213A EP 0855472 A1 EP0855472 A1 EP 0855472A1
Authority
EP
European Patent Office
Prior art keywords
signal
screen wall
sensor element
conversion
screen
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Withdrawn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
EP98200213A
Other languages
German (de)
French (fr)
Inventor
Hendrik Spek
Peter Jan Lobbezoo
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.)
VAN SPLUNDER FUNDERINGSTECHNIEK BV
Original Assignee
VAN SPLUNDER FUNDERINGSTECHNIEK BV
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 VAN SPLUNDER FUNDERINGSTECHNIEK BV filed Critical VAN SPLUNDER FUNDERINGSTECHNIEK BV
Publication of EP0855472A1 publication Critical patent/EP0855472A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/06Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing

Definitions

  • a screen wall 10 in the floor As shown schematically is shown in the view of Figure 2, for Example of prefabricated screen wall elements in sequence let down into the floor 11, one each following Screen wall element 3 with its longitudinal edge 4 in the longitudinal edge 2 of the previous one, already embedded in the floor, on it subsequent screen wall element 1 engages; first only with its lower end, and with increasing introduction into the ground in the direction of the arrow over an ever larger one Length.
  • a screen wall is, for example, many meters deep and, for example, connects to one with its lower edge waterproof layer, for example a natural one Clay layer.
  • a screen wall element is preferably on both Long sides with profiling for mutual intervention equipped and, for example, resistant to bending, such as one steel sheet piling, or bendable, like one Foil.
  • a screen wall is preferably made of one or more Groups of uniform screen wall elements built, the for example rammed into the ground, shaken or pressed will.
  • a combination wall is made of vertical tubular and sheet metal parts built.
  • the sensor means include Solenoid.
  • That the signal led over a wire to the surface of the earth has a number of disadvantages, such as: protecting the This wire must be fastened to the sheet piling plate Steel pipe are performed, which is insufficient Protection from melting by frictional heat during in particular of the vibrating process, so that the wire is still there has to be packed in, for example, an artificial foam, whereby the wires have to be laid in the workshop. Also through the above disadvantages is the application of a Sensor means relatively expensive, if not impossible.
  • a purpose of the invention is to use sensor means to make it cheaper. Another purpose is that To make application of sensor means more reliable. A Another purpose is to recover sensor media enable or make it more reliable. A another purpose is the need to connect and / or the disassembly of valuable wiring do.
  • the invention realizes at least one of the purposes of the signals of the sensor means wirelessly to the Bring the surface of the earth, for which the signals are preferred first converted into a signal to be transmitted by transmission means will.
  • a wave signal is preferred an ultrasound signal is sent to the earth's surface, although electromagnetic waves, like radar waves, are usable.
  • the signal can be electrical Include current or voltage pulses, for example if the Soil has sufficient galvanic conductivity.
  • the floor can be the screen wall element as a conduction medium be used.
  • the signal to be transmitted wirelessly preferably with a local one, for example with a battery or Battery powered transmitter generated.
  • the transmitter can also be Take energy from the environment, for example when the sensor reacted to a potential field.
  • the sensor like a solenoid, is also preferably powered locally, preferably with the same energy source as that of the transmitter.
  • the Sensor means and the sending means can be an integral part be mounted on the screen wall element.
  • the sensor means can for example be a magnetic switch or comprise a solenoid or one on a potential field based sensor, for example around the longitudinal edge of the a screen wall element a potential field of suitable Averaging is generated while the potential field sensor on the cooperating longitudinal edge of the other screen wall element is fixed and detects deviations in the potential field, which can be an indication that the longitudinal edges are not correctly interlock.
  • Another alternative sensor means is for example a power wire that is broken as in NL-A-7908262, so that a circuit is interrupted whereby the transmitter sends a signal. It goes without saying that the remote receiver on the Transmitter can be tuned.
  • the transmitter can be of the type be in which two types of pulse are emitted; the one Pulse type, which indicates that the profiles interlock well, while the other indicates that the opposite is the case.
  • Figure 1 shows two interlocking edge profiles of Screen wall elements in top view.
  • Element 1 is already there inserted in the ground and has a profile 2; element 3 is introduced and has a profile 4.
  • 5 is a protective strip to 1, which can be omitted if necessary.
  • 6 is a Proximity switch and transmitter about 50 cm from the lower edge of the element 3, and is with threaded connector 9 in the threaded hole 7 is screwed in and has on its underside a shield plate 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The method is used in installing a screen wall in the ground. In each profile edge of an already installed wall element or panel, a profiled edge of a next wall element or panel is inserted. The correct engagement of the two edges is monitored with a sensor element on one of these elements. The sensor element output or a conversion signal taken from it is sent or transmitted by wireless transmission to a remote display and/or processor device. This displays the state of the mutual engagement of adjacent wall panels. Preferably the transmission signal is an acoustic signal e.g. an ultrasound signal. The signal may be generated by an energy source controlled by a local clock or time independent.

Description

Um im Boden eine Schirmwand 10 zu erstellen, wie dies schematisch in der Ansicht von Figur 2 dargestellt ist, werden zum Beispiel vorgefertigte Schirmwandelemente der Reihe nach abwärts in den Boden 11 eingelassen, wobei jeweils ein folgendes Schirmwandelement 3 mit seinem Längsrand 4 in den Längsrand 2 des vorigen und schon in den Boden eingelassenen, daran anschließenden Schirmwandelements 1 eingreift; zunächst lediglich mit seinem unteren Ende, und mit zunehmender Einführung in den Boden in Pfeilrichtung über eine immer größere Länge. Eine Schirmwand steckt zum Beispiel viele Meter tief und schließt zum Beispiel mit ihrem unteren Rand an eine wasserundurchlässige Schicht an, zum Beispiel eine natürliche Tonschicht. Ein Schirmwandelement ist vorzugsweise an beiden Längsseiten mit Profilierung zum gegenseitigen Eingreifen ausgestattet und zum Beispiel verbiegungssteif, wie eine stählerne Spundwandplatte, oder verbiegungsfähig, wie eine Folie. Eine Schirmwand ist vorzugsweise aus einer oder mehreren Gruppen gleichförmiger Schirmwandelemente aufgebaut, die zum Beispiel in den Boden gerammt, gerüttelt oder gepreßt werden. Zum Beispiel ist eine Kombinationswand aus senkrechten rohr- und blechförmigen Teilen aufgebaut. Bekannt ist zum Beispiel aus NL-A-7908262, daß das gegenseitige Anschließen von Spundwandplatten mit Sensormitteln zu überprüfen, die an dem unteren Ende einer Spundwandplatte befestigt sind und über elektrisch leitende Drähte ihre Signal zur Erdoberfläche bringen. Nach NL-B-191614 umfassen die Sensormittel ein Solenoid. Die Offenbarung und die Einsicht dieser beiden Dokumente ist hier durch Bezugnahme aufgenommen, und nach der vorliegenden Erfindung auch auf andere Schirmwände anwendungsfähig, wie auf Schirmwände aus Folie. Nach der Erfindung können die Sensormittel sich auch an einer anderen Stelle als in der Nähe des unteren Randes des Schirmwandelements befinden.To create a screen wall 10 in the floor, as shown schematically is shown in the view of Figure 2, for Example of prefabricated screen wall elements in sequence let down into the floor 11, one each following Screen wall element 3 with its longitudinal edge 4 in the longitudinal edge 2 of the previous one, already embedded in the floor, on it subsequent screen wall element 1 engages; first only with its lower end, and with increasing introduction into the ground in the direction of the arrow over an ever larger one Length. A screen wall is, for example, many meters deep and, for example, connects to one with its lower edge waterproof layer, for example a natural one Clay layer. A screen wall element is preferably on both Long sides with profiling for mutual intervention equipped and, for example, resistant to bending, such as one steel sheet piling, or bendable, like one Foil. A screen wall is preferably made of one or more Groups of uniform screen wall elements built, the for example rammed into the ground, shaken or pressed will. For example, a combination wall is made of vertical tubular and sheet metal parts built. Is known for Example from NL-A-7908262 that the mutual connection of sheet piles with sensor means to check the the lower end of a sheet piling are attached and over electrically conductive wires send their signal to the earth's surface bring. According to NL-B-191614, the sensor means include Solenoid. The revelation and the insight of these two Document is incorporated here by reference, and according to the present invention also applicable to other screen walls, like on screen walls made of foil. According to the invention the sensor means can also be located at a location other than located near the lower edge of the screen wall element.

Daß das Signal über einen Draht zur Erdoberfläche geführt wird, hat eine Reihe von Nachteilen, wie: zum Schutze des Drahtes muß dieser durch ein an der Spundwandplatte befestigtes Stahlrohr geführt werden, was allerdings unzureichenden Schutz vor dem Schmelzen durch Reibungswärme während insbesondere des Rüttelverfahrens bietet, so daß der Draht auch noch in zum Beispiel einem Kunstschaum verpackt werden muß, wodurch die Drähte in der Werkstatt verlegt werden müssen. Auch durch die vorstehend genannten Nachteile ist die Anwendung eines Sensormittels relativ kostspielig, wenn nicht sogar unmöglich.That the signal led over a wire to the surface of the earth has a number of disadvantages, such as: protecting the This wire must be fastened to the sheet piling plate Steel pipe are performed, which is insufficient Protection from melting by frictional heat during in particular of the vibrating process, so that the wire is still there has to be packed in, for example, an artificial foam, whereby the wires have to be laid in the workshop. Also through the above disadvantages is the application of a Sensor means relatively expensive, if not impossible.

Ein Zweck der Erfindung ist es, die Anwendung von Sensormitteln preiswerter zu machen. Ein anderer Zweck ist der, die Anwendung von Sensormitteln zuverlässiger zu machen. Ein weiterer Zweck ist der, die Rückgewinnung von Sensormitteln zu ermöglichen beziehungsweise zuverlässiger zu machen. Ein weiterer Zweck ist der, die Notwendigkeit des Anschließens und/oder des Demontierens kostbarer Verkabelung überflüssig zu machen.A purpose of the invention is to use sensor means to make it cheaper. Another purpose is that To make application of sensor means more reliable. A Another purpose is to recover sensor media enable or make it more reliable. A another purpose is the need to connect and / or the disassembly of valuable wiring do.

Die Erfindung realisiert wenigstens einen der Zwecke, indem die Signale der Sensormittel drahtlos beispielsweise an die Erdoberfläche gebracht werden, wozu die Signale vorzugsweise zunächst in ein von Sendemitteln auszusendendes Signal umgewandelt werden. Vorzugsweise wird ein Wellensignal, vorzugsweise ein Ultraschallsignal an die Erdoberfläche gesandt, obwohl auch elektromagnetische Wellen, wie Radarwellen, brauchbar sind. Gegebenenfalls kann das Signal elektrische Strom- oder Spannungspulse umfassen, zum Beispiel wenn der Boden ausreichende galvanische Leitfähigkeit aufweist. Statt des Bodens kann das Schirmwandelement als Leitungsmedium genutzt werden. Das drahtlos zu übermittelnde Signal wird vorzugsweise mit einem lokal, zum Beispiel mit Akku oder Batterie versorgten Sender erzeugt. Auch kann der Sender seine Energie der Umgebung entnehmen, zum Beispiel wenn der Sensor auf ein Potentialfeld reagiert. Der Sensor, wie ein Solenoid, wird ebenfalls vorzugsweise lokal mit Strom versorgt, vorzugsweise mit derselben Energiequelle wie die des Senders. Die Sensormittel und die Sendemittel können als integrales Teil auf dem Schirmwandelement montiert sein.The invention realizes at least one of the purposes of the signals of the sensor means wirelessly to the Bring the surface of the earth, for which the signals are preferred first converted into a signal to be transmitted by transmission means will. Preferably a wave signal is preferred an ultrasound signal is sent to the earth's surface, although electromagnetic waves, like radar waves, are usable. If necessary, the signal can be electrical Include current or voltage pulses, for example if the Soil has sufficient galvanic conductivity. Instead of of the floor can be the screen wall element as a conduction medium be used. The signal to be transmitted wirelessly preferably with a local one, for example with a battery or Battery powered transmitter generated. The transmitter can also be Take energy from the environment, for example when the sensor reacted to a potential field. The sensor, like a solenoid, is also preferably powered locally, preferably with the same energy source as that of the transmitter. The Sensor means and the sending means can be an integral part be mounted on the screen wall element.

Die Sensormittel können zum Beispiel einen Magnetschalter oder ein Solenoid umfassen oder einen auf einem Potentialfeld basierenden Sensor, wobei zum Beispiel um den Längsrand des einen Schirmwandelements ein Potentialfeld von dazu geeigneten Mitteln erzeugt wird, während der Potentialfeldsensor an dem zusammenwirkenden Längsrand des anderen Schirmwandelements befestigt ist und Abweichungen in dem Potentialfeld erfaßt, was ein Hinweis darauf sein kann, daß die Längsränder nicht korrekt ineinander fassen. Ein weiteres alternatives Sensormittel ist zum Beispiel ein Stromdraht, der unterbrochen wird, wie nach NL-A-7908262, so daß ein Stromkreis unterbrochen wird, wodurch der Sender ein Signal sendet. Es ist selbstverständlich, daß der in Entfernung befindliche Empfänger auf den Sender abgestimmt werden kann. Der Sender kann einer des Typs sein, bei dem zwei Pulsarten ausgestrahlt werden; die eine Pulsart, die angibt, daß die Profile gut ineinandergreifen, während die andere angibt, daß das Gegenteil der Fall ist.The sensor means can for example be a magnetic switch or comprise a solenoid or one on a potential field based sensor, for example around the longitudinal edge of the a screen wall element a potential field of suitable Averaging is generated while the potential field sensor on the cooperating longitudinal edge of the other screen wall element is fixed and detects deviations in the potential field, which can be an indication that the longitudinal edges are not correctly interlock. Another alternative sensor means is for example a power wire that is broken as in NL-A-7908262, so that a circuit is interrupted whereby the transmitter sends a signal. It goes without saying that the remote receiver on the Transmitter can be tuned. The transmitter can be of the type be in which two types of pulse are emitted; the one Pulse type, which indicates that the profiles interlock well, while the other indicates that the opposite is the case.

Die Figur 1 zeigt zwei ineinanderfassende Randprofile von Schirmwandelementen in der Draufsicht. Das Element 1 ist schon in den Boden eingeführt und hat ein Profil 2; das Element 3 wird eingeführt und hat ein Profil 4. 5 ist ein Schutzstreifen an 1, der gegebenenfalls ausgelassen werden kann. 6 ist ein Näherungsschalter und Sender in etwa 50 cm Entfernung vom unteren Rand des Elements 3, und ist mit Gewindestutzen 9 in das Gewindeloch 7 eingeschraubt und hat an seiner Unterseite eine Abschirmungsplatte 8.Figure 1 shows two interlocking edge profiles of Screen wall elements in top view. Element 1 is already there inserted in the ground and has a profile 2; element 3 is introduced and has a profile 4. 5 is a protective strip to 1, which can be omitted if necessary. 6 is a Proximity switch and transmitter about 50 cm from the lower edge of the element 3, and is with threaded connector 9 in the threaded hole 7 is screwed in and has on its underside a shield plate 8.

Claims (4)

Verfahren zur Überprüfung der Aufstellung eines Schirmwandteils beim im Boden Anbringen einer Schirmwand, wobei jeweils in einen Profilrand eines schon eingeführten Schirmwandelements ein Profilrand eines nachfolgenden Schirmwandelements eingeführt wird, und wobei das korrekte gegenseitige Eingreifen der beiden Profilränder mit einem Sensorelement an einem dieser Schirmwandelemente überwacht wird, wobei die Erfassung dieses Sensorelements oder ein davon abgeleitetes Umwandlungssignal dieses Sensorelements drahtlos an eine sich im Abstand befindende Anzeige- und/oder Verarbeitungsvorrichtung übersandt oder übermittelt wird, um den Zustand des gegenseitigen Eingreifens dieser Profilränder anzuzeigen.Procedure for checking the installation of a screen wall part when installing a screen wall in the floor, whereby each in a profile edge of an already introduced screen wall element a profile edge of a subsequent screen wall element is introduced, and being the correct mutual Engage the two profile edges with a sensor element one of these screen wall elements is monitored, the Detection of this sensor element or a derivative thereof Conversion signal of this sensor element wirelessly to itself spaced display and / or processing device is sent or transmitted to the state of the indicate mutual intervention of these profile edges. Verfahren nach Anspruch 1, wobei das Sendesignal ein akustisches, insbesondere ein Ultraschallsignal ist.The method of claim 1, wherein the transmit signal is on acoustic, in particular an ultrasonic signal. Verfahren nach Anspruch 1 oder 2, wobei das Umwandlungssignal und/oder das Sendesignal mittels einer vorzugsweise lokal tätigen und/oder vorzugsweise unabhängig tätigen Energiequelle, wie eines galvanischen Akkus, vorzugsweise elektrisch erzeugt wird, vorzugsweise durch ein Umwandlungsmittel beziehungsweise ein Sendemittel.The method of claim 1 or 2, wherein the conversion signal and / or the transmission signal by means of a preferably operate locally and / or preferably independently, like a galvanic battery, preferably electrical is generated, preferably by a converting agent or a transmission medium. Schirmelement zur Ausführung des Verfahrens nach Anspruch 1, wobei dieses mit einem Sensorelement und einem wirksam damit gekoppelten Sende-Element ausgestattet ist, um Sensorsignale, gegebenenfalls nach der Umwandlung durch dazu geeignete Umwandlungsmittel in geeignete Sendesignale, drahtlos mit dem Sendeelement an ein Empfangselement zu übermitteln.Screen element for performing the method according to claim 1, this with a sensor element and an effective coupled transmitter element is equipped to receive sensor signals, if necessary after the conversion by suitable ones Conversion means into suitable transmission signals, wireless with to transmit the transmitting element to a receiving element.
EP98200213A 1997-01-24 1998-01-26 Method of installing a cut-off wall in the soil Withdrawn EP0855472A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1005083 1997-01-24
NL1005083 1997-01-24

Publications (1)

Publication Number Publication Date
EP0855472A1 true EP0855472A1 (en) 1998-07-29

Family

ID=19764272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200213A Withdrawn EP0855472A1 (en) 1997-01-24 1998-01-26 Method of installing a cut-off wall in the soil

Country Status (1)

Country Link
EP (1) EP0855472A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7908262A (en) 1979-11-12 1981-06-01 Hollandsche Betongroep Nv Piling plant for shuttering planks of dam - has wall seal with slotted edges with male and female sections mating with sealing rod activating signal generator
NL8603243A (en) * 1986-12-19 1988-07-18 Hattum & Blankevoort Bv Checking position of dam wall plates - generating magnetic field by solenoid to check deviation indicated by lamp in electric circuit revealing interruptions
FR2646188A1 (en) * 1989-04-24 1990-10-26 Soletanche Method for monitoring the engagement of sealing membranes and sealing membranes for the implementation of this method
EP0431710A1 (en) * 1989-12-08 1991-06-12 Hollandsche Beton Groep N.V. Lock monitoring system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7908262A (en) 1979-11-12 1981-06-01 Hollandsche Betongroep Nv Piling plant for shuttering planks of dam - has wall seal with slotted edges with male and female sections mating with sealing rod activating signal generator
NL8603243A (en) * 1986-12-19 1988-07-18 Hattum & Blankevoort Bv Checking position of dam wall plates - generating magnetic field by solenoid to check deviation indicated by lamp in electric circuit revealing interruptions
NL191614B (en) 1986-12-19 1995-07-03 Hattum & Blankevoort Bv Method for checking the placement of sheet piles when placing a sheet pile wall and sheet pile in the ground before carrying out the method.
FR2646188A1 (en) * 1989-04-24 1990-10-26 Soletanche Method for monitoring the engagement of sealing membranes and sealing membranes for the implementation of this method
EP0431710A1 (en) * 1989-12-08 1991-06-12 Hollandsche Beton Groep N.V. Lock monitoring system

Similar Documents

Publication Publication Date Title
US4006481A (en) Underground, time domain, electromagnetic reflectometry for digging apparatus
JP2790975B2 (en) Transmission equipment used for monitoring of human holes
DE2523802A1 (en) ELECTRONIC CONTROL SYSTEM FOR ROAD TRAFFIC
EP0305484B1 (en) Device employing a tensile force meter for measuring tensile force
CN205756850U (en) Electric power special-purpose ultrasonic bird-scaring unit
EP0855472A1 (en) Method of installing a cut-off wall in the soil
DE60007018T2 (en) Compact seismic vibrator and method for its use in seismic monitoring and prospecting
DE2011857A1 (en) Method and device for securing rooms at risk of burglary
CN105305106A (en) Anti-theft grounding electrode for ground wire, and telegraph pole
CN210838137U (en) Grounding device for movable steam injection boiler of oil field
DE102007008469A1 (en) Measurement/report values transmitting device for use in e.g. electricity meter, has secondary antenna that is not connected with primary antenna, fixed outside housing, and coupled to primary antenna by near field coupling
CN209893076U (en) Wall body vibrations monitoring facilities for coal mine
DE102017006156A1 (en) Living object detection by means of vehicle-side ultrasonic sensors for inductive charging systems
NL1008121C1 (en) Testing installation of screen wall in ground
DE102008037463A1 (en) delineators
EP1282093A1 (en) System for telemonitoring of manholes, especially of manholes of a long-distance heating network
JPH10239262A (en) Method for diagnosing damage of pile and underground pile whose damage can be detected
KR100492932B1 (en) Electric pole to be used in electric exploration to test the ground status in the rear-area of a tunnel made by pre-pressed concrete shield blocks
KR102124644B1 (en) pipe type concrete grounding block
US2683765A (en) Ground plate and connector
CN203192949U (en) Special fixing grounding nail used for grounding wire installation
CN212966419U (en) Monitoring device and protective net for realizing ground digging alarm
CN216133476U (en) Device capable of realizing ground digging monitoring and protective net
CN213676427U (en) Direct current fills electric pile securing device
JPH10125367A (en) Grounding member

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid
RBV Designated contracting states (corrected)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19990130

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566