Bechtel International Corporation

John M Engstrom

Joseph M Anderson

Barney T Baldi

A joint seal comprises two elastomeric elements, configured to fit as a nested assembly within the gap between adjacent slabs. The outer element (the 'outer seal') is a generally U-shaped channel (with sides and a bottom), and performs the actual sealing function. The outer surfaces of the channel sides are formed with a series of longitudinally-extending fins, which frictionally engage the slab edges. The inner element ('the core') is formed as a generally rectangular tube that provides a structural strength for the seal assembly. It includes a tubular outer wall and an internal truss-type framework consisting of a number of interconnected webs. The seal assembly is installed under compression.

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Walnut Creek, CA, United States of America

John M Engstrom