Materials Handling handling porter _ _ Shandong reconnection

5.3 Deep Foundation waterproofing and drainage and precipitation scheme of deep foundation earth in order to ensure the safety of the excavation process, the need to take full account of the deep pit drainage, deep Foundation Pit Dewatering through always. After deep excavation to the bottom, 20 ~ 30m provided with a water pit, a small amount of groundwater flow together in the water pit (water pit is set to 2m * 2m * 1m, when the excavation pit in the middle of the corners and every Surrounded by walls punched channel support, with mortar surface), then the pump discharge deep pit outside. Sixth, heavy construction, difficulties and risk source analysis (1) Construction of precipitation: Well pit and tunnel precipitation for deep excavation and tunneling to provide "water" operating conditions is a major difficulty of the project, but also heavy engineering in priority. Section prepared on the basis of a preparation according to prepared on the basis of the construction program are: 1, "detailed geotechnical engineering investigation report," the Guangxi-based engineering survey Engineering Co., Ltd. 2, Urban and Rural Planning and Design Institute of this project related to construction, structure construction plans. 3, "engineering survey" GB50026-2007 4, "Building Ground Treatment Technical Specifications" JGJ79-2002 5, "Construction Quality Acceptance unified standard" GB50300-2001 6, "Building Foundation Engineering Quality Acceptance" GB50202-2002 7. "building excavation Technical specification" JGJ120-99 8, "bolt shotcrete support technical specifications" GB50086-2001 9, "site temporary electrical safety specifications" JGJ46-2005