| 摘要 |
PURPOSE: A tunnel support lattice girder is provided to enable mass production by simplifying the shape of a reinforcing bar coupler for supporting an upper reinforcing bar and a pair of lower reinforcing bars. CONSTITUTION: A tunnel support lattice girder(10) comprises a pair of lower reinforcing bars(22), an upper reinforcing bar(24), reinforcing bar couplers, and reinforcing couplers(40). The lower reinforcing bars are parallelly extended to form an arched curve. The upper reinforcing bar is located between the lower reinforcing bars and is installed in an arched shape. The reinforcing bar couplers are installed to be separated from each other and connect the lower reinforcing bars and the upper reinforcing bar. The reinforcing couplers are welded between the lower and upper reinforcing bars.
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