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GENERAL45369
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GENERAL45369
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Last modified
8/24/2016 8:14:32 PM
Creation date
11/23/2007 1:45:15 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980004
IBM Index Class Name
General Documents
Doc Date
5/13/2002
Doc Name
MSHA TEST SITE DOCUMENTATION-1980
Permit Index Doc Type
Other Permits
Media Type
D
Archive
No
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If the majority of the bolts still fall outside the required torque ranee, <br />necessary adjustments shall be made immediately. ]i, after these adjust- <br />( ~ ments are made, the required torque ranges are still not obtained, supple- <br />. mentary supports such as different length roof bo]ts with adequate anchor- <br />age, posts, cribs, or crossbars shall be installed. <br />13. A spot-check on torques shall be made during each 24-hour period on at <br />least one roof bolt out of every ten from the outby corner of the last <br />open crosscut to the face. such torque checks are necessary only in ad- <br />vancing sections in working places producing coal during any portion of <br />the aformentioned 24-hour period. <br />The results of these tests shall be recorded in the onshift examination <br />book. The record shall show the number of bolts tested and number above <br />and below the required range. <br />If the results show that the majority of the bolts are not maintaining at <br />least ** 91 foot-pounds of torque or have loaded up to where they <br />* 65 <br />exceed 225 foot-pounds or torque, supplementary support such as <br />additional roof bolts, longer roof bolts with adequate anchorage, posts, <br />cribs, or crossbars shall be installed. <br />14. Posts installed under roof that is cracked, broken, or susceptible to <br />sloughing shall have a wooden cap block, plank, or crossbar between <br />the post and the roof. Where crossbars or planks are installed, they <br />( shall be blocked to equally distribute the load across their length. <br />• 15. Posts shall be installed tight and on solid footing. Not more than <br />two wooden wedges shall be used to install a post. <br />16. A supply of suitable roof support material, including temporary supports <br />sufficient to support the roof during one complete cycle of mining, <br />shall be provided as close as practicable to each working face. (Each <br />plan shall specify the location for the supply of such materials.) <br />17. An additional .supply of supplementary roof support material consisting <br />of 20 roof bolts, at least 12 inches longer than the bolt length being <br />used, a minimum of 20 posts of proper length with sufficient cap pieces <br />and wedges, and where applicable, at least 6 crossbars shall be provided. <br />at the dumping point or within 50D feet of the faces, whichever is <br />closer. Tools and equipment necessary to install such support shall <br />be available within this distance. (The 2D roof bolts, 12-inches longer, <br />do not apply to resin installations.) <br />**Plates directly against roof. <br />*Plates against wood. . <br />9 <br />
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