Joint Sealing Systems for Precast Concrete Tunnel Liners


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Title: Joint Sealing Systems for Precast Concrete Tunnel Liners

Author(s): Joseph F. Lamond

Publication: Special Publication

Volume: 70


Appears on pages(s): 455-460

Keywords: economics; joint sealers; joints (junctions); manufacturing; precast concrete; quality control; sealing; tunnel linings; tunnels.

Date: 1/1/1981

This paper presents the state of the art in sealing joints in tunnels using precast concrete segments. With the development of the tunnel boring machine initial and final lining of a tunnel can be accomplished in a single operation using precast concrete segments. Factors which effect the joint sealing are the alignment accuracy of the tunnel boring machine; the geometry of the joints; and the joint sealing system. The manufacturing tolerances, particularly at the edges and corners, have to be considered in both design and construction. The use of precast concrete segments for tunnel lining is anticipated to be the most economical tunneling method in the future. The proper design and construction of the joint sealing system are the most important features in the precast concrete tunnel lining method.