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恶滩电站尾水渠围堰由原生岩石和混凝土组成,在水中爆破拆除后,需在水深7.3～12.7米的动水中把石碴取出。围堰岩层完整,预计爆破后岩石的块度较大。我们采用把HDK-6型附壁式抓岩机的气压抓斗改装在10吨动臂式门座起重机(以下简称门机)上,完成了水下抓岩出碴问题。一、改装设备的主要特性: 门机:起重量10吨, 起重高度20～37米扬程90米起重速度45米/分起重幅度37-18米行走速度18米/分臂架迥转速度0.75转/分臂架由最大伸幅变至最小伸幅所需时间3分钟抓斗:容积0.6米~3 工作风压5-7公斤/公分~2 气缸直径φ600毫米活塞最大行程630毫米耗气量6米~3/分自重2300公斤抓片张开最大直径φ300毫米抓斗闭合最大直径φ1600毫米二、通气抓碴原理:
The tailrace drainage cofferdam of Eotan Hydropower Station is made up of primary rock and concrete. After demolition in water, the ballast needs to be removed from the moving water at a depth of 7.3 to 12.7 meters. Cofferdam formation integrity, after blasting is expected to block larger rocks. We adopted the HDK-6-type wall-mounted gravel catching pressure grab to 10-ton boom-mounted portal crane (hereinafter referred to as the door machine) to complete the underwater grasp rock ballast problems. First, the main characteristics of modified equipment: Door machine: lifting capacity of 10 tons, lifting height of 20 to 37 meters Head lifting 90 meters Lifting speed of 45 m / min Lifting range of 37-18 meters Walking speed 18 m / Speed 0.75 rev / min boom from the maximum stretch to the minimum time required to stretch 3 minutes Grab: volume 0.6 m ~ 3 Working pressure 5-7 kg / cm ~ 2 Cylinder diameter φ600 mm Piston stroke of 630 mm Gas 6 m ~ 3 / min Weight 2300 kg Grip open the largest diameter φ300 mm Grab closed the largest diameter φ1600 mm Second, the principle of ventilation Grab the ballast: