EP0333577A1 - Système de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol - Google Patents

Système de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol Download PDF

Info

Publication number
EP0333577A1
EP0333577A1 EP89400698A EP89400698A EP0333577A1 EP 0333577 A1 EP0333577 A1 EP 0333577A1 EP 89400698 A EP89400698 A EP 89400698A EP 89400698 A EP89400698 A EP 89400698A EP 0333577 A1 EP0333577 A1 EP 0333577A1
Authority
EP
European Patent Office
Prior art keywords
wheels
guide
guide member
produced
profiled
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Withdrawn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
EP89400698A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jacques Charlier
Paul Dupeuble
Jean-Claude Gessay
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.)
Sondages Injections Forages SIF Enterprise Bachy
Original Assignee
Sondages Injections Forages SIF Enterprise Bachy
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 Sondages Injections Forages SIF Enterprise Bachy filed Critical Sondages Injections Forages SIF Enterprise Bachy
Publication of EP0333577A1 publication Critical patent/EP0333577A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/20—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels
    • E02F3/205—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels with a pair of digging wheels, e.g. slotting machines
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ

Definitions

  • the invention relates to a system for guiding the excavation tool used for producing a wall molded into the ground.
  • the walls molded into the ground are executed by alternating or successive elementary panels.
  • the finished work is therefore made up of a succession of unitary panels which must be able to guarantee geo-metric continuity during execution.
  • two channels are used independently or jointly.
  • the first consists of giving to excavation tools (mechanical or hydraulic skips in the case of discontinuous excavation and extraction of spoil, or drum or chain cutters, or rotary cutters in the case of continuous excavation and extraction) a body of great slenderness and of section very close to the excavation section, so as to achieve, in conjunction with the lowering of the center of gravity, self-guidance on the excavation even during execution.
  • Control and correction devices can be incorporated into the excavation tools so as to more or less effectively correct any deviation from the theoretical trajectory.
  • the second is to guide the excavation tool more or less effectively on the previously executed panel.
  • the formwork put in place at the end of the panel before concreting is extracted like a sliding formwork before the complete setting of the concrete.
  • the vacuum thus created makes it possible to ensure a certain guiding of the excavation tool when the next panel is executed.
  • European patent No. 0 101 350 describes a specific process for extracting the end formwork by lateral formwork which also makes it possible, at the same time, to ensure effective guidance of the excavation tool.
  • the guidance function of this device is subject to its simultaneous formwork, the primary object of the invention described.
  • this guiding method is basically based on the sliding of two elements one inside the other.
  • This system is therefore suitable in the case of the use of clamshell buckets as an excavation tool, but is totally unsuitable in the case of the use of continuous excavation tools such as cutters and wall milling cutters.
  • the present invention aims to provide an effective guidance system for the excavation tool during the entire digging operation of an elementary pass.
  • the invention relates to a system for guiding the excavation tool used for producing the trenches necessary for the production by successive or alternating panels of a wall molded into the ground, which comprises, in combination, a member vertical guide extending over the height of the trench to be produced and integral with a previously made adjacent wall panel or with a formwork placed at the end of the previously made adjacent panel, and guide wheels carried by the excavation tool and rolling on said guide member, characterized in that: (i) said guide member and said guide wheels are shaped and arranged so that said wheels are retained by the guide member against any horizontal force tending to separate them, and (ii) said wheels are profiled so as to be able to destroy any concrete obstacle or hardened grout possibly present on said guide member as they roll on said member.
  • the guide member has, in cross section, a T-profile whose foot extends parallel to the length of the trench to be produced and is secured at its base to a panel of adjacent wall previously made or a formwork placed at the end of said adjacent panel, and the system comprises at least two superimposed pairs of guide wheels oriented substantially perpendicular to said foot, the wheels of each pair being arranged on either side 'other of said foot, the wheels of the lower pair having their profiled periphery in the form of median cutting disc and the wheels of the upper pair having their profiled periphery in the form of two lateral cutting discs separated by an intermediate groove.
  • the guide member has, in cross section, an L-shaped profile, one of the branches of which extends parallel to the length of the trench to be produced and is integral with its base. an adjacent wall panel previously made or a formwork placed at the end of said adjacent panel.
  • the profiled guide wheels of any concrete obstacle or hardened grout present on the guide member provision may be made to apply to the parts of said member subjected to the action of profiled wheels a rubbery material or a relatively easily destructible material.
  • the coating thus formed constitutes a deformable support (in the case of a rubber) or easily destructible (in the case of a friable material, for example) which greatly facilitates the removal of obstacles of concrete or grout hardened by the profiled wheels.
  • the guide member comprises a strip extending parallel to the length of the trench to be produced, which is integral with an adjacent wall panel previously produced or with a formwork placed in place end of said adjacent panel, this strip being pierced at regular intervals with through lights so as to form a rack, and the system comprises at least one pair of guide wheels oriented substantially perpendicular to said strip, the wheels having teeth engaging lesdi your lights during the movement of the excavation tool along the guide member.
  • the wheels of each pair may be at the same height or slightly offset from one another.
  • the system may include pairs of additional guide wheels disposed above the pairs described above. These additional wheels, however, do not need to be profiled at their periphery and can therefore have a conventional flat tread.
  • the system of the invention is particularly advantageous in the case where the excavation tool is a cutting machine with continuous excavation. It can also be used in the case where the excavation tool is a dump machine with discontinuous excavation. In the following description, the invention will be more particularly described in relation to the use of a cutting machine as an excavation tool.
  • a wall cutter comprising four cutting drums 1 with a horizontal axis mounted in pairs on a central support 2 secured to the superstructure 3 of the machine, the two pairs of drums rotating in opposite directions.
  • the four drums belay the entire rectangular horizontal projection surface, with the exception of a central strip 4 of width corresponding to the location of the central support of the machine.
  • the guidance system for the excavation tool includes the following different elements: - A fixed guide rail 5 of T-shaped cross section placed in the axis of the previously executed panel ( Figure 2).
  • the bar 7 of the T, against the earth end, has a width of the same order as that of the central support of the cutting machine so as to be able to pass into the space existing between the excavation drums.
  • this guide rail 5 is secured, at the base of the foot of the T, with a temporary formwork 8 placed at the end of the adjacent panel 9 previously produced, all along the median generatrix of the last.
  • a temporary formwork 8 placed at the end of the adjacent panel 9 previously produced, all along the median generatrix of the last.
  • This guide rail could also, as a variant, conceive this guide rail as a lost rail, by securing it then to a sealing element incorporated in the panel 9 itself.
  • the guide rail thus placed in the plane of symmetry of the panel defines two parallel longitudinal grooves 10 with opposite openings, the common bottom of which is formed by the foot of the T.
  • Two superimposed mobile guide assemblies 11 and 12 secured to the excavation machine according to one of the edges of its superstructure and covering the guide rail 5 ( Figure 3).
  • Each guide assembly consists of two pairs of wheels, with a horizontal axis, perpendicular to the foot of the T-rail.
  • the wheels of the same pair are mounted on either side of the foot of the T-rail so as to engage the two opposite grooves defined by the guide rail.
  • the wheels of the same pair can be located at the same level as shown or slightly offset in the vertical direction.
  • the lower guide assembly 11 is formed by two pairs of lower 13 and upper 14 wheels profiled at their periphery.
  • the lower wheels 13 are profiled in the form of a median cutting disc 15, while the upper wheels 14 are profiled in the form of two lateral cutting discs 16 separated by an intermediate groove 17 (FIG. 1).
  • the lower guide assembly 12 is formed by two pairs of lower 18 and upper 19 wheels, the treads of which are flat.
  • Each pair of wheels thus opposes any horizontal movement of the machine, whether in its plane or in a perpendicular plane, allowing only a vertical movement in a rolling movement along the guide rail.
  • the grooves of the guide rail are cleaned so as to rid them of filling with bypass concrete is provided by the wheels 13 and 14 of the lower guide assembly 11.
  • the wheels 13 of the lower pair which are profiled at their periphery in the form of a median cutting disc, cause the concrete possibly present in the grooves 10 to disintegrate by punching along a central groove.
  • This punching action is important because the weight of the excavation tool is considerable (several tonnes).
  • the wheels 14 of the upper pair which are profiled, at their periphery, in the form of two lateral cutting discs, complete the destruction of the filling concrete thanks to the groove created by previous discs. It will be noted that the cleaning of the guide grooves obviously only arises for the lower mobile guide assembly, the upper guide assembly circulating in cleared grooves.
  • the rail 5 has, in cross section, the shape of an L, one of the branches of which extends parallel to the length of the trench to be produced.
  • This variant is of a simplified embodiment and is more particularly advantageous in the case where a lost rail is used.
  • Figures 5 and 6 is shown another embodiment of the guide system of the invention.
  • This embodiment differs from that of Figures 1-3 only in the nature of the guide rail and the wheels of the lower guide assembly.
  • the guide rail 5 consists of a single strip extending parallel to the length of the trench to be produced and which is pierced at regular intervals with through holes 20 so as to form a sort of rack
  • the lower guide assembly 11 is formed of a pair of toothed wheels 21, the teeth of one of the wheels 21 being offset with respect to the teeth of the other wheel, as shown, so as to come mesh in said lights.
  • the rail 5 of the embodiment of FIGS. 5 and 6 could have a T-section like the rail of the module of embodiment of FIGS. 1-3. In this case it would, of course, be the foot of the T which would be pierced with lights.
  • each tooth when it meshes with a light, comes to drive out the concrete plug possibly blocking the light.
  • each light is given a slight draft towards the outside so as to facilitate the evacuation of the debris.
  • one or both cogwheels can be driven by one or more rotary motor (s) incorporated in the superstructure of the machine, in order to help overcome friction and rolling resistance and ensure the correct operation of the device, the driving force of the motor or motors being oriented in the downward direction. Simultaneously this increases the vertical thrust on the excavation drums and, therefore, increases the speed of excavation.
  • rotary motor s
  • FIG. 7 shows the preferred embodiment in which the surfaces of the guide member 5 subjected to the action of the profiled wheels are coated with a rubber coating 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Mechanical Engineering (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
EP89400698A 1988-03-18 1989-03-14 Système de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol Withdrawn EP0333577A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803534 1988-03-18
FR8803534A FR2628772B1 (fr) 1988-03-18 1988-03-18 Systeme de guidage de l'outil d'excavation utilise pour la realisation d'une paroi moulee dans le sol

Publications (1)

Publication Number Publication Date
EP0333577A1 true EP0333577A1 (fr) 1989-09-20

Family

ID=9364399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400698A Withdrawn EP0333577A1 (fr) 1988-03-18 1989-03-14 Système de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol

Country Status (7)

Country Link
US (1) US4930940A (enrdf_load_html_response)
EP (1) EP0333577A1 (enrdf_load_html_response)
JP (1) JPH01299916A (enrdf_load_html_response)
AR (1) AR240348A1 (enrdf_load_html_response)
AU (1) AU609955B2 (enrdf_load_html_response)
FR (1) FR2628772B1 (enrdf_load_html_response)
TR (1) TR23553A (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663357A1 (fr) * 1990-06-15 1991-12-20 Bouygues Sa Dispositif pour faciliter l'extraction d'un coffrage, outil present dans le dispositif et application a la realisation d'une paroi moulee dans le sol.
EP0496719A1 (fr) * 1991-01-22 1992-07-29 S.A. Compagnie Internationale Des Pieux Armes Frankignoul Elément de coffrage en béton
EP0509934A1 (fr) * 1991-04-19 1992-10-21 SONDAGES INJECTIONS FORAGES "S.I.F." ENTREPRISE BACHY Société Anonyme dite: Procédé de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol, et outil d'excavation pour la mise en oeuvre de ce procédé
WO2013007968A2 (en) 2011-07-14 2013-01-17 Coupland John William Diaphragm wall apparatus and methods
US10988911B2 (en) 2017-04-26 2021-04-27 Ccmj Systems Ltd Diaphragm walls
US11225769B2 (en) 2018-02-15 2022-01-18 Ccmj Systems Ltd Shear key former apparatus and method(s)
US11268260B2 (en) 2017-11-06 2022-03-08 Ccmj Systems Ltd Cutting assembly

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311683A (en) * 1986-06-13 1994-05-17 Foundation Technology Limited Propulsion apparatus
FR2647828B1 (fr) * 1989-06-06 1991-08-30 Soletanche Procede et dispositif pour decoller du beton auquel il adhere, un joint d'extremite de panneau de paroi moulee dans le sol
US5247743A (en) * 1992-07-02 1993-09-28 Eagle-Picher Industries, Inc. Method and apparatus for digging trenches
DE19502324A1 (de) * 1994-12-09 1996-06-20 Wirth Co Kg Masch Bohr Schlitzfräse
DE10308539B3 (de) * 2003-02-27 2004-06-03 Bauer Maschinen Gmbh Fräsvorrichtung zum Fräsen von Schlitzen im Boden
DE10308538C5 (de) * 2003-02-27 2014-11-06 Bauer Maschinen Gmbh Verfahren zum Herstellen einer Schlitzwand im Boden, Schlitzwandfräse und Schlitzwandfräsvorrichtung
EP1640509B2 (de) * 2004-08-23 2014-03-05 BAUER Maschinen GmbH Vorrichtung und Verfahren zum Erstellen einer Schlitzwand im Erdboden
IT1401736B1 (it) * 2010-07-19 2013-08-02 Soilmec Spa Dispositivo di perforazione per l'esecuzione di diaframmi e relativo metodo.
JP6384715B2 (ja) * 2014-07-15 2018-09-05 清水建設株式会社 鋼製地中連続壁の芯材清掃装置
FR3107537B1 (fr) * 2020-02-25 2022-04-08 Soletanche Freyssinet Machine d’excavation ayant un châssis muni d’ailes de guidage
CN112962581B (zh) * 2021-03-08 2023-01-20 中国建筑一局(集团)有限公司 一种填海斜岩区域的超深地下连续墙结构的施工方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526176A (en) * 1946-02-25 1950-10-17 Benjamin Van Eyck Foundation machine
US3513572A (en) * 1967-09-01 1970-05-26 Stang Cofor Inc Excavating apparatus for digging trenches
US3796054A (en) * 1971-12-14 1974-03-12 U Piccagli Method for the construction of impermeable walls
GB2093090A (en) * 1981-01-29 1982-08-25 Nishimatsu Constr Co Ltd Method and apparatus for making a deep trench
EP0101350A1 (fr) * 1982-08-11 1984-02-22 Sondages Injections Forages "S.I.F." Entreprise Bachy Procédé et dispositif d'extraction d'un coffrage dans le cadre de la réalisation d'une paroi moulée dans le sol

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645101A (en) * 1970-11-04 1972-02-29 James L Sherard Method and apparatus for constructing impervious underground walls
US4249836A (en) * 1976-08-02 1981-02-10 Slurry Systems, Inc. Method and apparatus for building below ground slurry walls
JPS60133117A (ja) * 1983-12-20 1985-07-16 Taisei Corp 連続地中壁の継手部分の構築方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526176A (en) * 1946-02-25 1950-10-17 Benjamin Van Eyck Foundation machine
US3513572A (en) * 1967-09-01 1970-05-26 Stang Cofor Inc Excavating apparatus for digging trenches
US3796054A (en) * 1971-12-14 1974-03-12 U Piccagli Method for the construction of impermeable walls
GB2093090A (en) * 1981-01-29 1982-08-25 Nishimatsu Constr Co Ltd Method and apparatus for making a deep trench
EP0101350A1 (fr) * 1982-08-11 1984-02-22 Sondages Injections Forages "S.I.F." Entreprise Bachy Procédé et dispositif d'extraction d'un coffrage dans le cadre de la réalisation d'une paroi moulée dans le sol

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 294 (M-431)[2017], 20 novembre 1985; & JP-A-60 133 117 (TAISEI KENSETSU K.K.) 16-07-1985 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663357A1 (fr) * 1990-06-15 1991-12-20 Bouygues Sa Dispositif pour faciliter l'extraction d'un coffrage, outil present dans le dispositif et application a la realisation d'une paroi moulee dans le sol.
EP0496719A1 (fr) * 1991-01-22 1992-07-29 S.A. Compagnie Internationale Des Pieux Armes Frankignoul Elément de coffrage en béton
EP0509934A1 (fr) * 1991-04-19 1992-10-21 SONDAGES INJECTIONS FORAGES "S.I.F." ENTREPRISE BACHY Société Anonyme dite: Procédé de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol, et outil d'excavation pour la mise en oeuvre de ce procédé
FR2675526A1 (fr) * 1991-04-19 1992-10-23 Sif Entreprise Bachy Procede de guidage de l'outil d'excavation utilise pour la realisation d'une paroi moulee dans le sol, et outil d'excavation pour la mise en óoeuvre de ce procede.
US5263798A (en) * 1991-04-19 1993-11-23 Societe Anonyme Dite Sondages Injections Forages "S.I.F." Entreprise Bachy Process for guiding the excavation tool used for the construction of a wall cast in the ground, and excavation tool for implementing this process
WO2013007968A2 (en) 2011-07-14 2013-01-17 Coupland John William Diaphragm wall apparatus and methods
US9371623B2 (en) 2011-07-14 2016-06-21 Ccmj Systems Ltd Diaphragm wall apparatus and methods
US10988911B2 (en) 2017-04-26 2021-04-27 Ccmj Systems Ltd Diaphragm walls
US11268260B2 (en) 2017-11-06 2022-03-08 Ccmj Systems Ltd Cutting assembly
US11225769B2 (en) 2018-02-15 2022-01-18 Ccmj Systems Ltd Shear key former apparatus and method(s)

Also Published As

Publication number Publication date
AU3140489A (en) 1989-09-21
AU609955B2 (en) 1991-05-09
FR2628772A1 (fr) 1989-09-22
JPH0435568B2 (enrdf_load_html_response) 1992-06-11
JPH01299916A (ja) 1989-12-04
FR2628772B1 (fr) 1990-08-24
US4930940A (en) 1990-06-05
TR23553A (tr) 1990-03-23
AR240348A1 (es) 1990-03-30

Similar Documents

Publication Publication Date Title
EP0333577A1 (fr) Système de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol
EP2002061B1 (fr) Outillage de forage
CA2925072C (fr) Equipement de formage de surfaces, procede de fabrication et utilisation de l'equipement de formage de surfaces et unite mobile incluant l'equipement de formage de surfaces
EP3359744B1 (fr) Ouvrage de soutènement
EP0021987B1 (fr) Machine pour le creusement des galeries souterraines
EP0101350A1 (fr) Procédé et dispositif d'extraction d'un coffrage dans le cadre de la réalisation d'une paroi moulée dans le sol
EP0509934B1 (fr) Procédé de guidage de l'outil d'excavation utilisé pour la réalisation d'une paroi moulée dans le sol, et outil d'excavation pour la mise en oeuvre de ce procédé
EP0245155B1 (fr) Procédé pour la construction d'ouvrages sous des voies ferrées en exploitation
EP1626129B1 (fr) Machine pour creuser une tranchée et réaliser une paroi dans ladite tranchée
EP0250286B1 (fr) Procédé d'exploitation de mines ou carrières souterraines par enlevures descendantes et foudroyage et installation pour sa mise en oeuvre
FR2467917A1 (fr) Procede pour l'extraction de sediments marins au moyen d'un tube d'aspiration pendant librement et dispositif pour la mise en oeuvre de ce procede
CH642425A5 (fr) Procede de construction d'un ouvrage souterrain et ouvrage ainsi obtenu.
US2934841A (en) Ditching machine
FR2724411A1 (fr) Excavateur de tunnel principal-ancillaire et son procede de percage de tunnel
FR2570435A1 (fr) Procede et appareillage pour l'exploitation de couches de mineraux de forte pente, notamment de couches de charbon
FR2615544A1 (fr) Procede et machine de preparation de tranchees pour cables ou autres dans tous types de sols
FR2651531A1 (fr) Machine de percement a bouclier.
FR2566615A1 (fr) Procede et dispositif de traitement des sols pierreux et de mise en valeur de terrains reputes non cultivables
BE1011787A3 (fr) Procede et ponton de dragage.
EP0603024B1 (fr) Procédé pour la réalisation d'un passage transversal sous une voie ferrée ou une chaussée
FR2724188A1 (fr) Procede et dispositif pour la realisation de tranchee de drainage pour aire de jeu ou terrain de sport
EP2110476A2 (en) Device and method for the removal of ballasting material from a ballast bed
BE570277A (enrdf_load_html_response)
FR3138156A1 (fr) Machine d’excavation comportant des disques de découpe et procédé de découpe correspondant
FR3107537A1 (fr) Machine d’excavation ayant un châssis muni d’ailes de guidage

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 ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19891214

17Q First examination report despatched

Effective date: 19910531

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: 19920403