Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent
1983-01-17
1984-10-16
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Lining
52584, 403372, 405152, 405151, E21D 1100
Patent
active
044772041
ABSTRACT:
A modular cast concrete element of this invention, capable of being assembled with other, similar elements into a tubular underground installation (e.g., sewer duct, tunnel liner) has a well opening to each of its axially-facing end surfaces wherein a rod is received that is insertable in a like well in an axially adjacent element to guide one of the elements to a predetermined position relative to the other and lock it in that position. In each well is a securement member having an annular radially outer marginal portion confined in a circumferential radially inwardly opening groove in the well and having resilient radially inwardly projecting teeth. The teeth have radially inner edges on a circle of smaller diameter than the rod and are flexible axially to enable the rod to be easily inserted into the securement member but to engage it under convergent bias for holding it against withdrawal from the well. Each securement member is held in the concrete body of the element by a retainer which partially defines the well and defines the groove and which can be assembled from commercial plastic pipe fittings.
REFERENCES:
patent: 1337767 (1920-04-01), Hastings
patent: 1670625 (1928-05-01), Johannesson
patent: 2798748 (1957-07-01), Maurer
patent: 2950937 (1960-08-01), Bedford
patent: 3677015 (1972-07-01), Chlumecky
patent: 3779659 (1973-12-01), Habert
patent: 4299067 (1981-11-01), Bertschi
patent: 4318636 (1982-03-01), Thomas
patent: 4397583 (1983-08-01), Horncy et al.
Farley Donald J.
Rohde Clarence J.
Farley Donald J.
Hart John R.
Rohde Clarence J.
Selhulster Joseph P.
Taylor Dennis L.
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