EP0835984B1 - Method to substitute the supporting liquid by compressed air in an hydro-shield - Google Patents
Method to substitute the supporting liquid by compressed air in an hydro-shield Download PDFInfo
- Publication number
- EP0835984B1 EP0835984B1 EP97116218A EP97116218A EP0835984B1 EP 0835984 B1 EP0835984 B1 EP 0835984B1 EP 97116218 A EP97116218 A EP 97116218A EP 97116218 A EP97116218 A EP 97116218A EP 0835984 B1 EP0835984 B1 EP 0835984B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting wheel
- sectional region
- supporting liquid
- space
- compressed air
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 22
- 239000007788 liquid Substances 0.000 title claims description 11
- 239000004927 clay Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 2
- 239000012530 fluid Substances 0.000 description 22
- 238000012423 maintenance Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 210000000481 breast Anatomy 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/065—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end with devices for provisionally supporting the front face
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/0875—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a movable support arm carrying cutting tools for attacking the front face, e.g. a bucket
- E21D9/0879—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a movable support arm carrying cutting tools for attacking the front face, e.g. a bucket the shield being provided with devices for lining the tunnel, e.g. shuttering
Definitions
- the invention relates to a method for replacing in a hydroshield with a material discharge opening Cutting wheel supporting fluid supporting the face by compressed air, with the support fluid initially in an upper cross-sectional area with simultaneous Replacement is released by compressed air, then in the upper one Cross-sectional area of the working face with a support material is applied and then also in the lower cross-sectional area the supporting fluid through compressed air is replaced.
- the invention has for its object the method of to make it easier and safer at the beginning.
- the invention teaches in one Method of the type mentioned that after draining the supporting fluid in the upper cross-sectional area the material discharge openings on the face opposite side are mechanically closed and by Retracting the cutting wheel between the face and Cutting wheel a space is formed that subsequently the space in the upper cross-sectional area with buoyant fired clay balls that is then filled in the lower cross-sectional area Compressed air replaced and the remaining part of the space is filled with the clay balls, and that at least finally the clay ball layer in the space by advancing the cutting wheel against the working face is pressed.
- the buoyant burned Clay balls preferably have a diameter of 5 to 10 mm, they are commercially available in the form of BigPacks. These clay balls are expediently through feed openings in the cutting wheel with compressed air from 5 to 7 bar in blown the gap.
- the pressing of the clay balls against the face by advancing the cutting wheel, the if necessary accompanied by turning the cutting wheel can be, is preferably also immediately after Backfilling of the upper cross-sectional area Part of the space performed. If necessary, can it is also recommended to use the gap between the cutting wheel and Shield jacket of the hydroshield with an inflatable Seal the hose seal.
- a hydroshield in which a shield jacket 1 through a baffle 2 and a Pressure wall 3, a working chamber 4 is formed, in which so-called closed cutting wheel 5, i.e. one up on Material discharge openings 6 essentially closed Cutting wheel 5 works (see. Fig. 2).
- the working chamber 4 is during jacking with supporting fluid supporting the face filled, the pressure of which is between a baffle 2 and pressure wall 3 located compressed air cushion 7 is controlled. That through the material discharge openings 6 Extracted soil material is in the lower area of the Working chamber 4 discharged with the support liquid, fresh Support fluid is in the upper area of the working chamber 4th fed.
- this will be the normal support fluid against a thickened support fluid in the form an appropriately prepared bentonite suspension.
- this support fluid is initially in an upper cross-sectional area, e.g. the upper half of the cross-section, with simultaneous replacement by compressed air drained. Since the support fluid is thickened, remains on the face 8 an approximately 3 to 5 cm thick Layer.
- the material discharge openings 6 are now open the back of the cutting wheel 5 mechanically closed, with those in the lower cross-sectional area Material discharge openings 6 previously by turning the cutting wheel 5 are brought into the upper cross-sectional area.
- cover plates 9 which may be interposed a rubber seal 10 or a rubber frame in welded guide rails 11 inserted on the cutting wheel 5 and secured with wooden wedges 12 (cf. Figure 3). Then the cutting wheel 5 becomes one piece retracted so that between the face and cutting wheel a space 13 of 15 to 30 cm depth is created. The The cutting wheel 5 can also be retracted before or during Closing the material discharge openings 6 performed become. Then a line 14 is connected to a feed opening 15 connected in the cutting wheel 5; this feed opening 15 can also be from a partially closed material discharge opening 6 be formed.
- Line 14 leads to a spraying machine 16 in a follower 17, via the fired clay balls floating with compressed air of 5 to 7 bar 18 with a diameter of 5 to 10 mm in the upper part of the space 13 until it is filled be blown in; the clay balls 18 are the injection molding machine 16 supplied in the form of BigPacks 19. then the cutting wheel 5 is rotated a little and against the Face 8 advanced, with a space in the space 13 Mixture of thickened support fluid, undamaged Clay balls and clay parts of broken clay balls are created.
- the clay balls 18 can after pumping and Approaching the hydroshield at least partially separated and be used again later.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Ersetzen von in einem Hydroschild mit einem Materialaustragsöffnungen aufweisenden Schneidrad die Ortsbrust stützender Stützflüssigkeit durch Druckluft, wobei die Stützflüssigkeit zunächst in einem oberen Querschnittsbereich bei gleichzeitigem Ersatz durch Druckluft abgelassen wird, danach im oberen Querschnittsbereich die Ortsbrust mit einem Stützmaterial beaufschlagt wird und anschließend auch im unteren Querschnittsbereich die Stützflüssigkeit durch Druckluft ersetzt wird.The invention relates to a method for replacing in a hydroshield with a material discharge opening Cutting wheel supporting fluid supporting the face by compressed air, with the support fluid initially in an upper cross-sectional area with simultaneous Replacement is released by compressed air, then in the upper one Cross-sectional area of the working face with a support material is applied and then also in the lower cross-sectional area the supporting fluid through compressed air is replaced.
Verfahren der genannten Art benötigt man zur Durchführung von Wartungsarbeiten und Beseitigung von Hindernissen in der Arbeitskammer des Hydroschildes.Methods of the type mentioned are required for implementation of maintenance work and removal of obstacles in the working chamber of the hydraulic shield.
Bei einem bekannten Verfahren dieser Art (DE 44 09 049 C1) wird nach dem Ablassen der Stützflüssigkeit im oberen Querschnittsbereich zwischen dem oberen und dem unteren Querschnittsbereich eine im wesentlichen horizontale, dichte Abtrennung eingebracht und anschließend der oberhalb der Abtrennung liegende obere Querschnittsbereich mit einem Festbestandteile enthaltenden Stützmaterial in Form von Kunstboden derart kraftschlüssig verfüllt, daß es im oberen Abbaukammer die erforderliche statische Stützfunktion übernehmen kann. Genutzt wird hiermit die Kenntnis, daß die Sicherheit gegen Ausbläser bei der Durchführung von Wartungsarbeiten in der Arbeitskammer erheblich verbessert werden kann, wenn eine Druckluftstützung ausschließlich im unteren Querschnittsbereich der Arbeitskammer durchgeführt wird. Das beschriebene Verfahren ist aber verhältnismäßig zeit- und kostenaufwendig, gleiches gilt auch für den späteren Ausbau vor Wiederaufnahme des Vortriebbetriebes. Außerdem ergeben sich gewisse Probleme hinsichtlich der Verdichtung des Kunstbodens und dessen Formschlüssigkeit mit dem Schildmantel und der Ortsbrust. Schwierig wird es auch, wenn mit einem Wasserandrang von der Ortsbrust her zu rechnen ist.In a known method of this type (DE 44 09 049 C1) after draining the support fluid in the upper Cross-sectional area between the upper and lower Cross-sectional area a substantially horizontal, tight separation introduced and then the above the upper cross-sectional area with a Support material containing solid components in the form of Artificial floor filled so forcefully that it is in the upper Extraction chamber perform the required static support function can. The knowledge is hereby used that the Security against blowouts when performing Maintenance work in the work chamber is significantly improved can be, if a compressed air support exclusively in lower cross-sectional area of the working chamber becomes. However, the procedure described is proportional time and cost consuming, the same applies to the later expansion before resumption of tunneling operations. There are also certain problems with the Compaction of the synthetic floor and its form fit with the shield coat and the face. It will be difficult even if there is a rush of water from the face to calculate.
Bekannt ist es zwar auch (DE 42 25 121 A1), bei einem Vortrieb mit einem Hydroschild die Stützflüssigkeit in dem hinter dem Schneidrad liegenden Bereich der Arbeitskammer durch schwimmfähige kugelförmige Füllkörper, insbesondere aus Kunststoff, zu ersetzen. Diese Füllkörper sollen beim Vortrieb permanent in der Arbeitskammer verbleiben und weisen deshalb solche Abmessungen auf, daß sie erheblich größer sind als die normale Korngröße des als Abraum anfallenden und abzufördernden Bodenmaterials. Mit dem eingangs geschilderten Verfahren zum Ersetzen der Stützflüssigkeit durch Druckluft, um die Arbeitskammer begehen zu können, haben diese Maßnahmen nichts zu tun.It is also known (DE 42 25 121 A1) when driving with a hydroshield the support fluid in the area of the working chamber behind the cutting wheel due to buoyant spherical packing, in particular plastic, to replace. These packing elements are said to Propulsion remain permanently in the working chamber and therefore have such dimensions that they are considerable are larger than the normal grain size of the overburden accumulating and removed soil material. With the initially described method for replacing the support fluid by compressed air to commit to the work chamber To be able to, these measures have nothing to do.
Der Erfindung liegt die Aufgabe zugrunde, das Verfahren der eingangs genannten Art einfacher und sicherer zu gestalten.The invention has for its object the method of to make it easier and safer at the beginning.
Zur Lösung dieser Aufgabe lehrt die Erfindung bei einem Verfahren der eingangs genannten Art, daß nach dem Ablassen der im oberen Querschnittsbereich befindlichen Stützflüssigkeit die Materialaustragsöffnungen auf der der Ortsbrust abgewandten Seite mechanisch verschlossen werden und durch Zurückfahren des Schneidrades zwischen Ortsbrust und Schneidrad ein Zwischenraum gebildet wird, daß anschließend der Zwischenraum im oberen Querschnittsbereich mit schwimmfähigen gebrannten Tonkugeln verfüllt wird, daß danach auch im unteren Querschnittsbereich die Stützflüssigkeit durch Druckluft ersetzt und der verbliebene Teil des Zwischenraumes mit den Tonkugeln verfüllt wird, und daß zumindest abschließend die im Zwischenraum befindliche Tonkugelschicht durch Vorrücken des Schneidrades gegen die Ortsbrust gedrückt wird.To achieve this object, the invention teaches in one Method of the type mentioned that after draining the supporting fluid in the upper cross-sectional area the material discharge openings on the face opposite side are mechanically closed and by Retracting the cutting wheel between the face and Cutting wheel a space is formed that subsequently the space in the upper cross-sectional area with buoyant fired clay balls that is then filled in the lower cross-sectional area Compressed air replaced and the remaining part of the space is filled with the clay balls, and that at least finally the clay ball layer in the space by advancing the cutting wheel against the working face is pressed.
Im Zuge des erfindungsgemäßen Verfahrens wird beim Einbringen der Tonkugeln in den Zwischenraum ein Teil der an der Ortsbrust noch anhaftenden Stützflüssigkeit zwischen die Tonkugeln verdrängt; diese Verdrängung von Stützflüssigkeit wird beim Andrücken der Tonkugeln durch das Schneidrad fortgeführt, wobei einige Tonkugeln auch zerbrechen. Im Ergebnis entsteht jedenfalls eine gas- und wasserundurchlässige Schicht zwischen Ortsbrust und Schneidrad, die die Ortsbrust wie ein plastischer Pfropfen verschließt. Der gebildete Pfropfen ist so dicht, daß letztendlich der Luftdruck in der Arbeitskammer auf Normaldruck abgesenkt werden kann, so daß die für Arbeiten unter Druckluft bestehenden strengen Auflagen zur Arbeitssicherheit umgangen werden können.In the course of the method according to the invention, during the introduction the clay balls in the space part of the the supporting breast still adhering to the supporting fluid between the clay balls displaced; this displacement of support fluid is pressed by the Cutting wheel continued, some clay balls too break. In any case, the result is a gas and waterproof layer between face and Cutting wheel that grafted the working face like a plastic one closes. The plug formed is so tight that ultimately the air pressure in the working chamber to normal pressure can be lowered so that for working under Compressed air existing strict requirements for occupational safety can be avoided.
Im einzelnen sind mehrere Ausgestaltungsmöglichkeiten für das erfindungsgemäße Verfahren gegeben. So werden die Materialaustragsöffnungen, die nach dem Ablassen der im oberen Querschnittsbereich befindlichen Stützflüssigkeit im unteren Querschnittsbereich liegen, vorzugsweise durch Drehen des Schneidrades in den oberen Querschnittsbereich gebracht und dort verschlossen. Zur weiteren Verbesserung der Dichtwirkung der gebildeten pfropfenartigen Dichtschicht kann es sich empfehlen, die im Normalbetrieb des Hydroschildes eingesetzte Stützflüssigkeit vor dem Ablassen gegen eine eingedickte Stützflüssigkeit auszutauschen. Eine andere oder zusätzliche Möglichkeit besteht insoweit darin, daß eine hochsteife Dickschicht insbesondere von 3 bis 5 cm auf die Ortsbrust aufgespritzt wird. Als eingedickte Stützflüssigkeit bzw. hochsteife Dickschicht wird vorzugsweise eine entsprechend angemachte Bentonitsuspension eingesetzt. Für den Zwischenraum hat sich eine Tiefe von 15 bis 30 cm als optimal herausgestellt. Die schwimmfähigen gebrannten Tonkugeln haben vorzugsweise einen Durchmesser von 5 bis 10 mm, sie sind in Form von BigPacks handelsüblich. Zweckmäßigerweise werden diese Tonkugeln durch Zuführöffnungen im Schneidrad mit Druckluft von 5 bis 7 bar in den Zwischenraum eingeblasen. Das Andrücken der Tonkugeln gegen die Ortsbrust durch Vorrücken des Schneidrades, das gegebenenfalls von einem Drehen des Schneidrades begleitet sein kann, wird vorzugsweise auch unmittelbar nach dem Verfüllen des im oberen Querschnittsbereichs liegenden Teils des Zwischenraumes durchgeführt. Im Bedarfsfalle kann es sich auch empfehlen, den Spalt zwischen Schneidrad und Schildmantel des Hydroschildes mit einer aufblasbaren Schlauchdichtung abzudichten.There are several design options for given the inventive method. So they will Material discharge openings that after draining the in support fluid in the upper cross-sectional area lower cross-sectional area, preferably through Turn the cutting wheel in the upper cross-sectional area brought and locked there. For further improvement the sealing effect of the plug-like sealing layer formed it can be recommended that in normal operation of the Hydroshield support fluid used before draining exchanged for a thickened support fluid. A another or additional possibility is to that a highly rigid thick layer, in particular from 3 to 5 cm is sprayed onto the face. As a thickened support fluid or highly rigid thick film is preferred an appropriately prepared bentonite suspension is used. For the gap there is a depth of 15 to 30 cm was found to be optimal. The buoyant burned Clay balls preferably have a diameter of 5 to 10 mm, they are commercially available in the form of BigPacks. These clay balls are expediently through feed openings in the cutting wheel with compressed air from 5 to 7 bar in blown the gap. The pressing of the clay balls against the face by advancing the cutting wheel, the if necessary accompanied by turning the cutting wheel can be, is preferably also immediately after Backfilling of the upper cross-sectional area Part of the space performed. If necessary, can it is also recommended to use the gap between the cutting wheel and Shield jacket of the hydroshield with an inflatable Seal the hose seal.
Im folgenden wird die Erfindung anhand einer Zeichnung näher erläutert; es zeigen in schematischer Darstellung
- Fig. 1
- einen Hydroschild mit für das erfindungsgemäße Verfahren wesentlichen Teilen,
- Fig. 2
- eine Rückansicht des Schneidrades des Hydroschildes nach Fig. 1,
- Fig. 3
- einen Schnitt A-B durch den Gegenstand der Fig. 2, und
- Fig. 4
- ein vergrößertes Detail C des Gegenstandes der Fig. 1.
- Fig. 1
- a hydroshield with parts essential for the method according to the invention,
- Fig. 2
- 2 shows a rear view of the cutting wheel of the hydraulic shield according to FIG. 1,
- Fig. 3
- a section AB through the subject of Fig. 2, and
- Fig. 4
- an enlarged detail C of the object of FIG. 1st
In der Fig. 1 erkennt man einen Hydroschild, bei dem in
einem Schildmantel 1 durch eine Tauchwand 2 und eine
Druckwand 3 eine Arbeitskammer 4 gebildet ist, in der ein
sogenanntes geschlossenes Schneidrad 5, d.h. ein bis auf
Materialaustragsöffnungen 6 im wesentlichen geschlossenes
Schneidrad 5 arbeitet (vgl. Fig. 2). Die Arbeitskammer 4
ist beim Vortrieb mit die Ortsbrust stützender Stützflüssigkeit
gefüllt, deren Druck über ein zwischen Tauchwand
2 und Druckwand 3 befindliches Druckluftpolster 7
gesteuert wird. Das durch die Materialaustragsöffnungen 6
hereingewonnene Bodenmaterial wird im unteren Bereich der
Arbeitskammer 4 mit der Stützflüssigkeit abgeführt, frische
Stützflüssigkeit wird im oberen Bereich der Arbeitskammer 4
zugeführt.In Fig. 1 you can see a hydroshield, in which
a shield jacket 1 through a
Sollen nun in der Arbeitskammer 4 Wartungsarbeiten durchgeführt oder Hindernisse beseitigt werden, ist die Stützflüssigkeit gegen Druckluft auszutauschen, damit die Arbeitskammer 4 durch eine Schleuse begangen werden kann. Maintenance work should now be carried out in the work chamber 4 or removing obstacles is the support fluid exchanged for compressed air so that the Working chamber 4 can be entered through a lock.
Im einzelnen wird hierzu zunächst die normale Stützflüssigkeit
gegen eine angedickte Stützflüssigkeit in Form
einer entsprechend angemachten Bentonitsuspension ausgetauscht.
Danach wird diese Stützflüssigkeit zunächst in
einem oberen Querschnittsbereich, z.B. der oberen Querschnittshälfte,
bei gleichzeitigem Ersatz durch Druckluft
abgelassen. Da die Stützflüssigkeit angedickt ist, verbleibt
auf der Ortsbrust 8 eine etwa 3 bis 5 cm starke
Schicht. Nunmehr werden die Materialaustragsöffnungen 6 auf
der Rückseite des Schneidrades 5 mechanisch verschlossen,
wobei die im unteren Querschnittsbereich liegenden
Materialaustragsöffnungen 6 zuvor durch Drehen des Schneidrades
5 in den oberen Querschnittsbereich gebracht werden.
Zum mechanischen Verschließen der Materialaustragsöffnungen
6 dienen Abdeckbleche 9, die gegebenenfalls unter Zwischenschaltung
einer Gummidichtung 10 oder eines Gummirahmens in
angeschweißte Führungsschienen 11 am Schneidrad 5 eingeschoben
und mit Holzkeilen 12 gesichert werden (vgl.
Fig.3). Anschließend wird das Schneidrad 5 ein Stück
zurückgefahren, so daß zwischen Ortsbrust und Schneidrad
ein Zwischenraum 13 von 15 bis 30 cm Tiefe entsteht. Das
Zurückfahren des Schneidrades 5 kann auch vor oder beim
Verschließen der Materialaustragsöffnungen 6 durchgeführt
werden. Alsdann wird eine Leitung 14 an eine Zuführöffnung
15 im Schneidrad 5 angeschlossen; diese Zuführöffnung 15
kann auch von einer nur teilweise geschlossenen Materialaustragöffnung
6 gebildet sein. Die Leitung 14 führt zu
einer Spritzmaschine 16 in einem Nachläufer 17, über die
mit Druckluft von 5 bis 7 bar schwimmfähige gebrannte Tonkugeln
18 mit einem Durchmesser von 5 bis 10 mm in den
oberen Teil des Zwischenraumes 13 bis zu dessen Füllung
eingeblasen werden; die Tonkugeln 18 werden der Spritzmaschine
16 in Form von BigPacks 19 zugeführt. Alsdann
wird das Schneidrad 5 ein wenig gedreht und gegen die
Ortsbrust 8 vorgeschoben, wobei im Zwischenraum 13 ein
Gemenge aus angedickter Stützflüssigkeit, unbeschädigten
Tonkugeln und Tonteilen zerborstener Tonkugeln entsteht.In detail, this will be the normal support fluid
against a thickened support fluid in the form
an appropriately prepared bentonite suspension.
After that, this support fluid is initially in
an upper cross-sectional area, e.g. the upper half of the cross-section,
with simultaneous replacement by compressed air
drained. Since the support fluid is thickened, remains
on the
Anschließend wird auch im unteren Querschnittsbereich die
Stützflüssigkeit durch Druckluft ersetzt und der verbliebene
Teil des Zwischenraumes 13 mit den Tonkugeln 18
verfüllt, woraufhin das Schneidrad 5 erneut ein wenig
gedreht und vorgeschoben wird. Zwischen Ortsbrust 8 und
Schneidrad 5 befindet sich nun ein gas- und flüssigkeitsdichter
Pfropfen 20, der zumeist sogar eine Absenkung
des Luftdrucks auf Normaldruck in der Arbeitskammer 4
erlaubt. Im Bedarfsfalle hilft es, wenn der Spalt 21
zwischen Schneidrad 5 und Schildmantel 1 mit einer aufblasbaren
Schlauchdichtung 22 abgedichtet wird (vgl. Fig.
4).Subsequently, the
Support fluid replaced by compressed air and the remaining one
Part of the
Nach Durchführung der gewünschten Arbeiten in der
Arbeitskammer 4 wird der Arbeitszustand der Arbeitskammer 4
und des Schneidrades 5 in umgekehrter Reihenfolge wieder
hergestellt. Die Tonkugeln 18 können nach Abpumpen und
Anfahren des Hydroschildes zumindest teilweise separiert
und später erneut verwendet werden.After performing the desired work in the
Working chamber 4 becomes the working state of working chamber 4
and the
Claims (11)
- A method of replacing the supporting liquid, which supports the local face (8) in a hydroshield comprising a cutting wheel (5) having material discharge openings (6), by compressed air, wherein the supporting liquid is firstly discharged in an upper cross-sectional region and is simultaneously replaced by compressed air, thereafter the local face is acted upon in said upper cross-sectional region by a supporting material, and subsequently the supporting liquid is replaced by compressed air in the lower cross-sectional region also, characterised in that after discharging the supporting liquid situated in the upper cross-sectional region, the material discharge openings on the side facing away from the local face are mechanically closed and a space (13) is formed between the local face and the cutting wheel by moving the cutting wheel back, that the upper cross-sectional region of the space is subsequently filled with fired, buoyant clay balls (18), that thereafter the supporting liquid is replaced by compressed air in the lower cross-sectional region also and the remaining part of the space is filled with clay balls, and that finally at least the layer of clay balls situated in the space is pressed against the local face by moving the cutting wheel forwards.
- A method according to claim 1, characterised in that the material discharge openings which are situated in the lower cross-sectional region after discharging the supporting liquid situated in the upper cross-sectional region are bought into the upper cross-sectional region by rotating the cutting wheel and are closed there.
- A method according to claim 1 or 2, characterised in that the supporting liquid which is used in normal operation of the hydroshield is replaced by a thickened supporting liquid before discharge.
- A method according to any one of claims 1 to 3, characterised in that before the clay balls are introduced each time, a high-stiffness thick layer is sprayed on to the local face.
- A method according to claim 4, characterised in that the high-stiffness thick layer is applied at a thickness of 3 to 5 cm.
- A method according to any one of claims 3 to 5, characterised in that a bentonite suspension is used as the thickened supporting liquid and as the high-stiffness thick layer.
- A method according to any one of claims 1 to 6, characterised in that the space is formed with a depth of 15 to 30 cm.
- A method according to any one of claims 1 to 7, characterised in that clay balls with a diameter of 5 to 10 mm are used.
- A method according to any one of claims I to 8, characterised in that the clay balls are blown into the space through feed openings in the cutting wheel by compressed air at 5 to 7 bar.
- A method according to any one of claims 1 to 9, characterised in that directly after filling the part of the space situated in the upper cross-sectional region the clay balls are pressed against the local face by moving the cutting wheel forwards.
- A method according to any one of claims 1 to 10, characterised in that the gap between the cutting wheel and the shield casing of the hydroshield is sealed by an inflatable tubular seal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19642093 | 1996-10-12 | ||
| DE19642093A DE19642093C1 (en) | 1996-10-12 | 1996-10-12 | Replacing support fluid for work face with compressed air |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0835984A2 EP0835984A2 (en) | 1998-04-15 |
| EP0835984A3 EP0835984A3 (en) | 1998-08-19 |
| EP0835984B1 true EP0835984B1 (en) | 2003-05-14 |
Family
ID=7808542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97116218A Expired - Lifetime EP0835984B1 (en) | 1996-10-12 | 1997-09-18 | Method to substitute the supporting liquid by compressed air in an hydro-shield |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0835984B1 (en) |
| DE (1) | DE19642093C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2846727B1 (en) * | 2002-10-30 | 2005-02-18 | Claude Bresso | SEAL JOINT ARRANGEMENT FOR TWO ARTICULATED PIECES |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2227083C3 (en) * | 1972-06-03 | 1981-07-30 | Wayss & Freytag Ag, 6000 Frankfurt | Shield for mechanical tunneling with a liquid-supported face |
| JPH04277292A (en) * | 1991-03-01 | 1992-10-02 | Takenaka Komuten Co Ltd | Replacing method for bit in shield tunneling method |
| DE4118907C1 (en) * | 1991-06-08 | 1992-06-11 | Wayss & Freytag Ag, 6000 Frankfurt, De | |
| DE4225121A1 (en) * | 1992-07-30 | 1994-02-03 | Westfalia Becorit Ind Tech | Method of supporting tunnel face during shield driving excavation - involves bulkhead with high level shuttered opening and vertical partition next to face forming air pocket in between |
| DE4409049C1 (en) * | 1994-03-17 | 1995-03-30 | Hochtief Ag Hoch Tiefbauten | Method of replacing the supporting liquid by compressed air and use of a hydraulic shield for carrying out the method |
-
1996
- 1996-10-12 DE DE19642093A patent/DE19642093C1/en not_active Expired - Fee Related
-
1997
- 1997-09-18 EP EP97116218A patent/EP0835984B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19642093C1 (en) | 1997-10-02 |
| EP0835984A2 (en) | 1998-04-15 |
| EP0835984A3 (en) | 1998-08-19 |
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