Roof Control Technology of Mining Roadway under the Influence of Advanced Supporting Pressure

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left">Model</td><td class="align_center">Material</td><td class="align_center">Width (mm)</td><td class="align_center">Length (mm)</td><td class="align_center">Height (mm)</td><td class="align_center">Thickness (mm)</td><td class="align_center">Bearing capacity (kN)</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">DFB4000-300</td><td class="align_center" rowspan="2">27simn</td><td class="align_center" rowspan="2">100</td><td class="align_center">4000</td><td class="align_center" rowspan="2">90</td><td class="align_center" rowspan="2">8</td><td class="align_center" rowspan="2">300～400, that is, when the beam span is 700 mm, concentrated load at beam center</td></tr><tr><td class="align_left">DFB3600-300</td><td class="align_center">3600</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The main technical characteristics of <i>π</i> type steel beam.</div>

Advances in Civil Engineering

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Table 3

Table 3: Roof Control Technology of Mining Roadway under the Influence of Advanced Supporting Pressure 