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Bracing and forming -- Key to fast subway construction

Silvestri, J.P. / Riffell, J.D.

Construction of 4600 ft of underground subway tunnel for Bay Area Rapid Transit system included 3300 ft of double-box structure; equipment was designed to improve excavation bracing system and concrete forming operations; excavation shoring made of soldier beams and lagging, was braced with 75-ton screw jack struts and without walers; struts were made from 14-in. steel pipe; screw jacks applied up to 40-ton load on shoring; movable jumbo with 12 screeds was designed for forming variable sectioned tunnel invert; two 25-ton jumbo forms, made from steel sections and plate, were used to form tunnel walls and ceiling; lagging formed outside of walls. (05819)

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Bracing and forming -- Key to fast subway construction

Silvestri, J.P. / Riffell, J.D.

Construction of 4600 ft of underground subway tunnel for Bay Area Rapid Transit system included 3300 ft of double-box structure; equipment was designed to improve excavation bracing system and concrete forming operations; excavation shoring made of soldier beams and lagging, was braced with 75-ton screw jack struts and without walers; struts were made from 14-in. steel pipe; screw jacks applied up to 40-ton load on shoring; movable jumbo with 12 screeds was designed for forming variable sectioned tunnel invert; two 25-ton jumbo forms, made from steel sections and plate, were used to form tunnel walls and ceiling; lagging formed outside of walls. (05819)

Bracing and forming -- Key to fast subway construction

Silvestri, J.P. / Riffell, J.D.

Construction of 4600 ft of underground subway tunnel for Bay Area Rapid Transit system included 3300 ft of double-box structure; equipment was designed to improve excavation bracing system and concrete forming operations; excavation shoring made of soldier beams and lagging, was braced with 75-ton screw jack struts and without walers; struts were made from 14-in. steel pipe; screw jacks applied up to 40-ton load on shoring; movable jumbo with 12 screeds was designed for forming variable sectioned tunnel invert; two 25-ton jumbo forms, made from steel sections and plate, were used to form tunnel walls and ceiling; lagging formed outside of walls. (05819)

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Title:

Bracing and forming -- Key to fast subway construction

Additional title:

Civ Eng (NY)

Contributors:

Silvestri, J.P. (author) / Riffell, J.D. (author)

Published in:

Civil Engineering (New York) ; 38

Publication date:

1968

Size:

3 pages

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

© Metadata Copyright Elsevier B. V. All rights reserved.

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