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ABC on LBJ Express Project – Innovative bent cap design and beam placement

 ABC on LBJ Express Project – Innovative bent cap design and beam placement
Author(s): , ,
Presented at IABSE Symposium: Engineering the Future, Vancouver, Canada, 21-23 September 2017, published in , pp. 2607-2614
DOI: 10.2749/vancouver.2017.2607
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The LBJ Express project rebuilt one of the most congested highways in Texas. Precasting most of the straddle bents that supported the 9-mile depressed section allowed for a fast construction and er...
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Bibliographic Details

Author(s): (Ferrovial Agroman US Corp, Austin, TX, USA)
(Ferrovial Agroman US Corp, Austin, TX, USA)
(Ferrovial Agroman US Corp, Austin, TX, USA)
Medium: conference paper
Language(s): English
Conference: IABSE Symposium: Engineering the Future, Vancouver, Canada, 21-23 September 2017
Published in:
Page(s): 2607-2614 Total no. of pages: 8
Page(s): 2607-2614
Total no. of pages: 8
Year: 2017
DOI: 10.2749/vancouver.2017.2607
Abstract:

The LBJ Express project rebuilt one of the most congested highways in Texas. Precasting most of the straddle bents that supported the 9-mile depressed section allowed for a fast construction and erection of the bents. In order to maintain the existing traffic at all times, some bent caps were constructed in several phases, and post-tensioning was used to connect different bent segments. For the IH-35E section, composite straddle bents were placed overnight in a single operation that allowed for a reduction of the original schedule. Existing cross bridges along I-635 created constructability issues because of low vertical clearance and crane placement constraints. An 82 meter long custom-built truss system enabled each beam to be carried transversely, moving across the bent cap to its final location, accelerating the bridge construction. This paper describes in detail some of these innovative designs and how they were implemented during construction.

Keywords:
bridges prestressing precast post-tensioning accelerated bridge construction innovative structural systems roads Construction equipment for Bridges Bent caps