运河煤矿轨道巷甩车场交岔点大断面施工研究

The Construction Researches on Yard Junction of Large Section of Roadway in Yunhe Coal Mine

在交叉点的施工过程中,要以既能保证施工安全,又要施工快速方便,特别是要减少倒矸次数为原则,并根据围岩稳定程度、断面大小、掘进方向和施工设备以及具体的技术条件等灵活施工。此方法先以小断面导硐将交岔点切口掘好后,再掘支巷,再由主巷向支巷刷帮扩大断面。与原施工方法相比,除确保安全还有以下优点:避免顶板暴露面积过大,确保在岩性松软的情况下保证巷道造型;减小施工难度,为加快施工速度、缩短围岩暴露时间,中间岩柱暂时保留,待交岔点支护好后用简易爆破的方法把它除掉。

During the construction of junction we should take the principle of safe quick and reduce the times of rock pouring as possible and also construct according the strength of surrounding rock,the size of section,the way of mining,construction equipment and other special technology conditions.This method dig out the notch with pilot heading in small section first,then dig the offset,and enlarge the section form main roadway to offset.Compare with the original construction method,there are advantages below besides safe guarantee：avoid the large expose of roof and ensure the shape of roadway in soft rock,decrease the difficult of construction,.In order to increase the construction speed and decrease the expose time of surrounding rock,the medial rock pillar can temporary reserve and use simple explode method to take it away after the junction be supported.