Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1993-03-19
1994-09-13
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405146, 405141, E21D 906
Patent
active
053463315
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a shield tail sealing for driving shields, said sealing consisting of a basic body made of elastomeric (rubber or rubber-like) material having a substantially rectangular cross section in the longitudinal direction and being inclined against the driving direction, whereby a sealing nose is formed by molding on its sliding end on the inner side which nose, in the operating condition, presses elastically against the outer side of the tunnel lining; as well as of a holding means extending substantially centrally in the basic body and being fastened on a mounting support arranged on the tail (end part of the jacket of the shield) of the shield.
In the shield driving process, an annular gap forms behind the shield tail, which gap is outwardly limited by the surrounding rock or soil, and inwardly by the lining (encasement; tubing segments) of the tunnel. The sealing between the shield and the tunnel construction is accomplished by means of a shield tail sealing. In this connection, the annular gap has to be completely filled with injection mortar, whereby it is customary to carry out such injection through openings in the tubing segments or through pipelines through the shield.
A shield tail sealing according to this type is known from DE-C-32 06 927. This sealing has been tested in practical application; however, the problem of injecting under pressure with overcut (break-outs) in the stable soil (e.g. always in rocky sections) has not been resolved satisfactorily heretofore.
It is, therefore, the object of the present invention to make available a shield tail sealing which even with such overcut prevents the injection mortar from getting into the zone of the shield machine. This problem is resolved by the present invention.
The invention is explained hereinafter in greater detail on the basis of exemplified embodiments and by reference to the schematic drawings, in which:
FIGS. 1A and 1B show the shield drive by the tubing method of construction (FIG. 1A) as well as the basic structure of the shield tail sealing (FIG. 1B);
FIGS. 2 to 4 show shield tail sealings with one single outer sealing lip with a substantially triangular cross sectional shape (variation A);
FIG. 5 shows a shield tail sealing with at least one outer sealing lip with a substantially finger-shaped cross section form (variation B);
FIG. 6 shows a shield tail sealing with a spring metal sheet; and
FIG. 7 a shield tail sealing with a drag metal sheet.
FIG. 1A shows the shield drive by the tubing method of construction (tubing segments 1), whereby sealing profiles made of elastomeric material are used in the zones I to V, said profiles having different application-specific basic structures. In detail:
Now, FIG. 1B shows the shield tail sealing according to the type of the invention, whereby the basic body (2), which is inclined against the driving direction (direction indicated by the arrow), has in the upper zone (VI) adjacent to the shield tail on the outer side at least one sealing lip--hereinafter referred to as the outer sealing lip--according to the invention which, when the annular gap (3) between the outer side (4) of the tubing segments and the geological tunnel environment (5) is filled, prevents the injection mortar from getting into the zone of the shield machine even with an overcut (6).
According to FIG. 2, the basic body (2) of the shield tail sealing (7) has a substantially rectangular cross section in the longitudinal direction. A holding-means (8) extending substantially centrally in said basic body is fastened on a mounting support (10) arranged on the shield tail (9). A sealing nose (12) is formed by molding on the sliding end of the inner side (11) of the basic body, which nose, in the operating condition, elastically presses against the outer side (4) of the tunnel lining. Now, in the upper zone adjacent to the shield tail (9), the outer side (13) of the basic body has an outer sealing lip (14) which, viewed cross sectionally, has a substantially triangular shape. This outer sealing lip is provided
REFERENCES:
patent: 3910058 (1975-10-01), Fouillade
patent: 3979920 (1976-09-01), Burgess et al.
Patent Abstracts of Japan, vol. 14, No. 335, Jul. 19, 1990.
Anheuser Lothar
Glang Siegfried
Phoenix Aktiengesellschaft
Taylor Dennis L.
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