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Tunnel Convergence Gauge

    The tunnel convergence gauge (also known as convergence gauge) is a kind of engineering test instrument for measuring and monitoring of deformation of the tunnels and underground caverns. This displacement meter uses one regular steel ruler under tension by one heavy hammer to transfer the displacement; a dial indicator is used for reading of the relative position change of certain two points in the tunnel and hence to calculate the relative displacement of two points in the connection direction (namely convergence value); the measuring of the peripheral displacement can find the rule for deformation of the surrounding rocks and provide necessary information for the design and construction of support system and provide means for ensuring safety of the construction as well.  

Tunnel Convergence Gauge