Bridge within a bridge

Article Abstract:

Bridge experts Steinman Boynton Gronquist and Birdsall designed an addition to the Tagus River suspension bridge in Portugal. The company designed the original four-lane roadway bridge in 1960 to be retrofitted, but it was 1992 before the company was contracted again to add a railway deck and an extra automobile lane. The international consortium Consorcio Tejo, which won the $220 million contract to do the construction work, was headed by DSD Dillinger Stahlbau. The bridge will open for rail traffic in 1999, with construction work having caused minimal disruption to traffic flow.

Services, Cover Story, Transportation, Bridge construction, Lisbon, Portugal, Steinman Boynton Gronquist and Birdsall, DSD Dillinger Stahlbau GmbH

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Bridge to the past

Article Abstract:

A combination of archaeological accounts, field surveys involving aerial photography and computer-aided graphics helped to analyze and evaluate the structure of the Pre-Columbian bridge at Yaxchilan built by the Mayan civilization in 7th century. the bridge structure included south and north bridge piers, bridge abutments and mechanisms and a stairway connecting the plaza to the riverbank. It can also be hypothesized from the data that the bridge was a rope-cable suspension bridge.

Mayas, Native American architecture, Mayan culture

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Swedish success

Article Abstract:

The construction of the Hoga Kusten Bridge in Sweden was complicated by the weather, landscape and different languages spoken by construction workers participating in the project. Nonetheless, the bridge is expected to be completed four months ahead of schedule and within the alloted budget. The bridge will also have the seventh-longest main span of any suspenion bridge in the world, measuring 1,210 m.

Public works, Sweden

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