Process for continuously lining a tunnel with extruded concrete

Details Process for continuously lining a tunnel with extruded concrete Process for continuously lining a tunnel with extruded concrete

1986-07-07

1989-04-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming structural installations in situ

Sequentially molding in situ different portions or layers on...

264 33, 264256, 264269, 264308, 405146, B28B 114, E21D 1110

Patent

active

048204587

ABSTRACT:
A tunnel having an inner surface and extending along an axis is lined with pumpable concrete having a predetermined hardening time and by a form having an annular inner wall and an axially movable front wall. Substantially equal sized batches of pumpable concrete are successively injected into the space through the movable front wall through a plurality of angularly equispaced ports therein. The batches are injected axially backwardly through the ports at such a rate that succeeding batches are injected through each port at a time interval that is substantially smaller than the concrete hardening time. The front wall is displaced forward at such a rate and the batches are sized such that each batch spreads over a predetermined axial and a predetermined angular distance, such that the latter is greater than the former.

REFERENCES:
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patent: 4437788 (1984-03-01), Walbrohl
patent: 4530621 (1985-07-01), Furuta et al.
patent: 4618298 (1986-10-01), Takamiya et al.
patent: 4645378 (1987-02-01), Hentschel
patent: 4652174 (1987-03-01), Cornely et al.

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