Installation of roof separation instrument 

 In order to accurately reflect the changes of roof separation indicator followed by face head-on installation, after installation, separation indicator in the face of 10-600 m each class observation record 

 Installation steps: 

 7m-8m deep hole Roofbolter ∮ 28mm drill bit to play; 

 Deep point: deep basis points anchoring push with a mounting pole into the hole until the bottom of the hole, out of the mounting pole, pull the wire rope, to confirm that the anchor has been stuck in deep base should be above the fixed roof 7m-8m at; 

 Shallow point: the mounting pole to push the shallow basis points anchoring to 2.3 meters at the hand after taking the mounting pole to pull the rope, to confirm the anchoring device has been fixed; 

 2, both ends of the screws aligned scale: shallow, deep note of the initial reading, screws card dead, and amputated the extra wire rope. 

 Use of the roof separation instrument 

 1, the roadway at intervals of 5m-10m install a LBY-roof separation indicator; ionosphere indicator installation location away from the head shall not exceed 1.5m, otherwise it is impossible to capture the whole process of the roof separation; 

 2, wire should advance plate is good, push the anchoring device-by-turn commence to prevent entanglement knot; 

 3, shallow basis points anchoring must be accurate positioning this in advance to install poles and marked; 

 4 After installation, the two scale cursor should be in free telescopic status, without any jamming phenomenon; 

 5, the construction area teams want to roof separation indicates the instrument settings, installation, hanging signs set into the accountability of the construction of the tunnel. Such as roadway at intervals of 5m-10m a LBY-roof separation indicator most suitable; 
 LBY-3A roof separation indicators for monitoring the separation of the roof strata displacement of dedicated instruments for surveillance monitoring of roof displacement (surrounding rock ionosphere) the amount, to avoid the cave roof collapse of the roof (wall rock). LBY-3A roof separation indicator mainly suitable for using the bolt length anchor support the tunnel roof and the need to measure the roof displacement of the face. Coal mine engineering and technical personnel and testing staff to determine the length of the bolt, tensile strength, is to understand the use of the anchor, anchor cable of the reasonableness of the scientific basis of the economy. Features: roof separation indicator, high sensitivity, intuitive display, greatly reducing the visual error. The main parameters: measuring rope length of the monitoring point hole diameter accuracy range measurement range 2:00 ￠ 27mm ± 1mm ??100mm (shallow basis points); 150mm (deep basis points) 2-3m (shallow basis points, drill end position); 5-7m ( 10 m of the deep basis points) 
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