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一、利用已竣工鑽孔掘进天井的合理性我队4号天井是沿鑽孔向上掘进的,从实踐初步体会有下列优点(鑽孔直徑160毫米): 1.通风良好: 沒有鑽孔的天井,爆破后,一般需要压縮空气通风2～3小时以上,有时由于爆破后渗入矿碴內的有毒瓦斯徐徐上升,加之工作人员的呼吸及电石灯对氧气的消耗,使支柱工在工作进行中,呼吸困难,尤其在高天井,通风工作稍有为慎,就极易发生恶性中毒和窒息,有造成重大伤亡事故的危险。利用已竣工的鑽孔
I. Rationality of using the completed borehole to dig into the well Our team’s No. 4 shaft is excavated along the borehole. From the practice, we have the following advantages (diameter 160mm): 1. Well ventilated: Patio without drilling After blasting, it usually takes more than 2 to 3 hours for compressed air to ventilate. Sometimes the toxic gas infiltrated into the mine after blasting increases slowly, and the breathing of workers and the consumption of oxygen by the calcium carbide lamp make the pillar work in progress. Difficulties in breathing, especially in high patios, where the ventilation work is a little cautious, it is prone to malignant poisoning and suffocation, and there is a risk of major injury and death. Utilize completed boreholes