Improved concrete spraying and explosive charging 06 Jul 2017

Spraymec Norrunner 140 DC

Himec RM T125 with emulsion charging unit

To improve the mechanisation and automation of sprayed concrete work on underground projects, Normet has introduced a new Spraymec Norrunner 140 DC. The new machine has a long reach spray boom, an average spraying capacity of up to 26m³/hr, an on-board compressor with a capacity of 12m³/min and a constant 7 bar pressure to deliver enough air for spraying operations. It is designed for use in tunnels of up to 19.5m high x 28m wide.

A new optional smart boom allows less rebound due to a coordinated motion control linked to concrete pump output and the Norrunner can accurately spray linings of less than 80mm thick to protect against water and frost. The spraying operation can be powered either by diesel drive or electric power, which allows flexibility for sites in remote places and all operational access points are reachable from ground level to make routine service easy.

Normet has also introduced improvements to its Himec man lifting and installation and Charmec explosives charger ranges. Both now have rigid frame carriers which provide better driving stability compared to the articulated carrier used on earlier models, and the carriers also have four wheel and crab drive giving better maneuverability in tunnels. The engine in the new carrier is placed on the side of the equipment so that all engine and exhaust after- treatment system service points are easily accessed from tunnel floor level. There is an optional driving-from-the-basket feature allowing the operator in the basket to safely and easily move each unit from the work platform.

All Himec lifting equipment models can also be easily modified to Charmec explosive charging equipment by adding an emulsion explosive charging unit. The modified Himec RMT 125 and the Spraymec Norrunner 140 DC were unveiled at the recent WTC World Tunnel Congress in Bergen, Norway.