springing line

American  

noun

Architecture.

1. a horizontal line between the springs of an arch or dome.

2. the rise or the angle of the rise of an arch.

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Example Sentences

Before this mortar had set, concrete was rammed in between it and the sheeting to a height of 18 ins. above the springing line, and then the remainder of the concrete placed without outside forms.

From Concrete Construction Methods and Costs by Gillette, Halbert Powers

A concrete-mixing plant was placed in each shaft, the mixer being located high enough to discharge into cars at about the level of the springing line of the arch.

From Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158 by Brace, James H.

The concrete for the portion of the pier above springing line and for the lower portions of the haunches was dumped direct from the cars.

From Concrete Construction Methods and Costs by Gillette, Halbert Powers

A special set of inside forms, about 2 ft. high, extending to the springing line of the dome, was then put in, and the dome forms were set up on it.

From Transactions of the American Society of Civil Engineers, Vol. LXX, Dec. 1910 A Concrete Water Tower, Paper No. 1173 by Kempkey, A.

This form carried the concrete from about 2 ft. below to about 2 ft. above the springing line.

From Concrete Construction Methods and Costs by Gillette, Halbert Powers