由于乡镇煤矿的开采技术设备较落后,井下长期出现大面积的淋水,特别是在雨季更为突出,使井下整个运输巷污水砂泥漫延。由于水沟排水距离长,使排水沟底沉淀泥砂物增高,水位随之上升,使部份水带着砂泥物向上漫延到整个巷道,行人不便,易腐蚀轨道和坑木。为了解决这个问题,特将排水沟添设阻砂坑。在施工过程中,各矿应按井下涌出量的大小及 Due to the backward mining technology and equipment of township coal mines, a large area of ​​long-term water pouring occurs in the underground, especially during the rainy season, resulting in the spread of sewage sand and mud in the underground transport lane. Due to the long drainage ditch, the amount of sediment at the bottom of drainage ditches is increased and the water level rises. As a result, some of the water drifts with sand and mud to the entire roadway, pedestrian inconvenience, corrosive orbits and pits. In order to solve this problem, special drainage ditches add sand blocking pit. In the construction process, the mine should press downhole down the size and