• Short Summary

    Frost and snow could have disastrous effects upon modern pre-stressed concrete bridges because of the uneven expansion and contraction of the upper and lower surfaces.

  • Description

    Frost and snow could have disastrous effects upon modern pre-stressed concrete bridges because of the uneven expansion and contraction of the upper and lower surfaces. To combat this, Swiss engineers have fitted five such bridges at Murg, on the Walensee, with built-in heaters, comprising electrified wire mesh sunk into the concrete. The position of these bridges is ideal for the tests because they all lie within the shade during the three months of hard winter, so that variations which might be caused by the sun are eliminated. This particular bridge is kept at a temperature of 18 degrees fahrenheit above freezing point by passing only 25 volts through the insulated mesh. The tests, spread over the whole winter, will provide engineers with the statistics by which they will be able to decide the best temperature for all conditions and circumstances.

  • Tags

  • Data

    Film ID:
    VLVAAO9T63TJJ0VXLQXZHVZQP3F75
    Media URN:
    VLVAAO9T63TJJ0VXLQXZHVZQP3F75
    Group:
    Reuters - Source to be Verified
    Archive:
    Reuters
    Issue Date:
    27/02/1958
    Sound:
    Unknown
    HD Format:
    Available on request
    Stock:
    Black & White
    Duration:
    00:01:43:00
    Time in/Out:
    /
    Canister:
    N/A

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