DE4031072A1

DE4031072A1 - Shield seal for tunnelling machines - has at least two elastomer blades pointing against direction of movement and by space filled with e.g. bentonite

Info

Publication number: DE4031072A1
Application number: DE4031072A
Authority: DE
Inventors: Siegfried Glang
Original assignee: Phoenix AG
Current assignee: Phoenix AG
Priority date: 1989-10-04
Filing date: 1990-10-02
Publication date: 1991-04-11
Anticipated expiration: 2010-10-03
Also published as: DE4031072C2

Abstract

A shield seal for tunnelling machines has an elastomer component sloping against the direction of advancing the tunnel and it has a sealing lip which presses against the face of the tunnel; the component concerned is attached to the shield sleeve but can be replaced. It consists of at least two separate blades set at an angle of 30-60 deg. and pref. 40-50 deg. to the tunnel face; the space between the blades is filled with a pressure-stabilising paste, and a coolant tube can be set up at the end of the shield sleeve. The component and its sealing lips are pref. made of rubber based on natural, rubber, styrene-butadiene, polychloroprene, mixed ethylene-propylene-diene polymer, nitrile rubber, silicone rubber or other types which are resistant to swelling, weathering and chemicals. ADVANTAGE - The use of the filling between the blades (e.g. bentonite) enables them to grade their pressure on to the grouting. It also acts as a lubricant.

Description

Die Erfindung betrifft eine Schildschwanzdichtung gemäß Oberbe griff des Anspruchs 1. Hinsichtlich des Standes der Technik wird auf die DE-C-26 46 570 und DE-C-32 06 927 verwiesen.The invention relates to a shield tail seal according to Oberbe handle of claim 1. With regard to the prior art reference is made to DE-C-26 46 570 and DE-C-32 06 927.

Die Erfindung gemäß Kennzeichen des Anspruchs 1 (Variante A) oder des Anspruchs 2 (Variante B) als Weiterentwicklung bisheriger Schildschwanzdichtungen zeichnet sich besonders durch den Einsatz eines druckstabilisierenden Stoffes in Form einer pastösen Masse (z. B. Bentonit) aus. Diese Masse ermöglicht eine entsprechende Druckabstufung zum Verpreßmörtel. Gleichzeitig wirkt diese Masse als Schmier- bzw. Gleitmittel.The invention according to the characterizing part of claim 1 (variant A) or claim 2 (variant B) as a further development of previous ones Shield tail seals are particularly characterized by their use a pressure-stabilizing substance in the form of a pasty mass (e.g. bentonite). This mass enables a corresponding one Pressure gradation for grout. At the same time, this mass works as a lubricant.

Während bei der Ausführung nach Variante A eine montierbare Kühlleitung, die sich am Ende des Schildmantels befindet, erforder lich ist, kann im Rahmen der Dichtungsvariante B gegebenenfalls auf eine derartige Zusatzvorrichtung verzichtet werden.While in the version according to variant A a mountable Cooling line, which is located at the end of the shield jacket, is required Lich can, if necessary, within the scope of seal variant B. such an additional device can be dispensed with.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf schematische Zeichnungen näher erläutert. Es zeigen:The invention is described below using exemplary embodiments explained in more detail with reference to schematic drawings. Show it:

Fig. 1 die Schildschwanzdichtung nach Variante A und Fig. 1, the shield tail seal according to variant A and

Fig. 2 die Schildschwanzdichtung nach Variante B. Fig. 2, the shield tail seal according to variant B.

Die Schildschwanzdichtung nach Fig. 1 besteht aus drei getrennt angeordneten Schenkeln (1, 2, 3), die entgegen die Vortriebs richtung (Pfeilrichtung) in einem Winkel α von etwa 45° geneigt sind. Die Verankerung der Schenkel erfolgt mittels eines Fundaments (4, 5, 6), das sich zwischen den Schenkeln und dem Schildmantel (7) befindet, sowie mittels Schrauben (8, 9, 10). Durch dieses Befestigungssystem sind die Schenkel leicht austauschbar, falls Abnutzungserscheinungen den Austausch erforderlich machen. Am Ende des Schildmantels (7) befindet sich eine Kühlleitung (11), um den Verpreßmörtel (12) im Gefrierver fahren abzudichten. Durch diese Maßnahme ist es möglich, daß auch der Schenkel (1) leicht ausgetauscht werden kann. Zwischen den Schenkeln befindet sich raumfüllend ein druckstabilisierender Stoff (13, 14), z. B. aus Bentonit. Die Schenkel besitzen jeweils eine Dichtungslippe (15, 16, 17), die federnd gegen die Außen seite (18) des Tunneläusbaus drückt, wobei der Schenkel und die Dichtlippe im unbelasteten Zustand (gestrichelte Linienführung) ohne Winkeländerung ineinander übergehen. Zweckmäßigerweise sind die Schenkel mit einem zusätzlichen Federblech (19) ausgestattet. Hinsichtlich des Dichtungsprofils (20) wird beispielsweise auf die Patentschrift GB-B-21 70 561 verwiesen.The shield tail seal according to Fig. 1 consists of three separately arranged legs (1, 2, 3) opposite the propulsion direction (arrow direction) at an angle α of approximately 45 ° are inclined. The legs are anchored by means of a foundation ( 4 , 5 , 6 ), which is located between the legs and the shield casing ( 7 ), and by means of screws ( 8 , 9 , 10 ). With this fastening system, the legs can be easily replaced if wear and tear make replacement necessary. At the end of the shield jacket ( 7 ) there is a cooling line ( 11 ) to seal the grout ( 12 ) in the freezing process. This measure makes it possible for the leg ( 1 ) to be easily replaced. Between the legs there is a space-filling material ( 13 , 14 ), z. B. from bentonite. The legs each have a sealing lip ( 15 , 16 , 17 ) which resiliently presses against the outer side ( 18 ) of the tunnel housing, the leg and the sealing lip merging into each other in the unloaded state (dashed lines) without changing the angle. The legs are expediently equipped with an additional spring plate ( 19 ). With regard to the sealing profile ( 20 ), reference is made, for example, to the patent specification GB-B-21 70 561.

Nach Fig. 2 weist der Grundkörper (21) der Schildschwanzdichtung zwei Dichtlippen (22, 23) auf, die im unbelasteten Zustand einen Winkel γ bzw. δ besitzen, der größer ist als der Winkel β (zweckmäßigerweise etwa 30°) des Grundkörpers. Die Verankerung der Schildschwanzdichtung erfolgt mittels eines Fundaments (24), das längs der Basisseite (25) des Grundkörpers (21) schräg in Vortriebsrichtung verläuft, sowie mittels eines Schraubensystems (26), das sich von dem Dichtlippensteg (27) bis zum Fundament (24) längs durch den Grundkörper hindurch erstreckt. Das Fundament selbst ist am Schildmantel (28) befestigt. Zwischen den beiden Dichtungslippen (22, 23) und der Außenseite (29) des Tunnel ausbaus befindet sich raumfüllend der druckstabilisierende Stoff (30). Die Pfeilrichtung gibt hier wieder die Vortriebs richtung an.According to FIG. 2, the basic body (21) of the shield tail seal has two sealing lips (22, 23) which γ an angle in the unloaded state or possess δ which is larger than the angle β (preferably about 30 °) of the basic body. The shield tail seal is anchored by means of a foundation ( 24 ) which runs obliquely in the direction of advance along the base side ( 25 ) of the base body ( 21 ), and by means of a screw system ( 26 ) which extends from the sealing lip web ( 27 ) to the foundation ( 24 ) extends longitudinally through the base body. The foundation itself is attached to the shield jacket ( 28 ). Between the two sealing lips ( 22 , 23 ) and the outside ( 29 ) of the tunnel expansion is the space-stabilizing material ( 30 ). The direction of the arrow again indicates the direction of advance.

Claims

1. Shield tail seal for shield tunneling machines, consisting

- From a base body made of elastomeric material, which is inclined against the direction of advance and the tip of which as a sealing lip ( 15 , 16 , 17 ) is pressed resiliently against the outside ( 18 ) of the tunnel construction, wherein
- The base body is anchored interchangeably on the shield casing ( 7 ), characterized in that
- The base body consists of at least two separate legs ( 1 , 2 , 3 ) whose angle of inclination α (based on the outside 18 ) is 30 to 60 °, in particular 40 to 50 °, wherein
- A space-stabilizing substance ( 13 , 14 ) in the form of a pasty mass is between the legs filling the space, and that
- A mountable cooling line ( 11 ) is arranged at the end of the shield jacket (variant A).

2. Shield tail seal for shield tunneling machines, consisting

- From a base body ( 21 ) made of elastomeric material, which is inclined against the direction of advance and the tip of which is resiliently pressed as a sealing lip ( 22 , 23 ) against the outside ( 29 ) of the tunnel construction, wherein
- The base body is anchored interchangeably on the shield casing ( 28 ), characterized in that
- The base body ( 21 ), whose angle of inclination β (based on the outside 29) is 20 to 50 °, in particular 25 to 35 °, has two sealing lips ( 22 , 23 ),
- Between which there is a pressure-stabilizing substance ( 30 ) in the form of a paste-like mass (variant B).

3. shield tail seal according to claim 1, characterized in that three legs ( 1 , 2 , 3 ) are present.

4. shield tail seal according to claim 1 or 3, characterized in that the leg ( 1 , 2 , 3 ) and the sealing lip ( 15 , 16 , 17 ) merge into one another in the unloaded state without changing the angle.

5. shield tail seal according to claim 1, 3 or 4, characterized characterized in that the angle of inclination α is approximately 45 °.

6. shield tail seal according to claim 1, 3, 4 or 5, characterized in that the leg ( 1 , 2 , 3 ) has a spring plate ( 19 ) in the driving direction.

7. shield tail seal according to claim 1, 3, 4, 5 or 6, characterized in that the anchoring means by means of a foundation ( 4 , 5 , 6 ), which is arranged at an angle between the legs ( 1 , 2 , 3 ) and shield jacket ( 7 ) is done, and by means of screws ( 8 , 9 , 10 ).

8. Shield tail seal according to claim 2, characterized in that the base body ( 21 ) and the sealing lips ( 22 , 23 ) have different angles in the unloaded state, the angle γ or δ of the sealing lips ( 22 , 23 ) being greater than the angle β of the base body ( 21 ).

9. shield tail seal according to claim 2 or 8, characterized characterized in that the angle β is approximately 30 °.

10. shield tail seal according to claim 2, 8 or 9, characterized in that the anchoring by means of a foundation ( 24 ) which runs obliquely in the direction of advance along the base side ( 25 ) of the base body ( 21 ), and by means of a screw system ( 26 ), which extends from the sealing lip web ( 27 ) to the foundation ( 24 ) longitudinally through the base body.

11. tail seal according to claim 2, 8, 9 or 10, characterized in that there is a mountable cooling line at the end of the shield jacket ( 28 ).

12. Shield tail seal according to one of claims 1 to 11, characterized in that the pressure-stabilizing substance ( 13 , 14 , 30 ) consists of bentonite.

13. Shield tail seal according to one of claims 1 to 12, characterized in that the base body as well Sealing lips made from a rubber mixture based Natural rubber (NR), styrene-butadiene rubber (SBR), Polychloroprene (CR), ethylene-propylene-diene copolymer (EPDM), nitrile rubber (NBR), silicone rubber or other swell, weather and chemical resistant Rubber types exist.

14. Shield tail seal according to one of claims 1 to 13, characterized in that the base body and the Sealing lips a Shore A hardness of 35 to 80 °, in particular from 60 to 70 °.