| 摘要 |
PURPOSE: An expansion survey meter of a bridge is provided to reduce the cost required for installation and maintenance, and to manage a bridge easily by measuring expansion exactly. CONSTITUTION: The expansion survey meter of a bridge contains transparent covers(15,20) hinged on primary and secondary survey plates(11,16) marked with degrees(12,17) to open and close the front parts of the primary and secondary survey plates(11,16), guides(13,18) installed on the lower parts of the primary and secondary survey plates(11,16), and guide holes(14,19) formed on the lower ends of the guides(13,18).
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