落水井施工(国外英文资料).docVIP

降水井施工(国外英文资料) Dewatering well construction 1, precipitation measures According to the construction plan provided in the bidding document, the groundwater depth at which the project is located is 4.6 - 9.3 meters. The project in the tunnel excavation depth of 8 - 9 meters, so the two section across the board should take deep precipitation, according to the relevant hydrogeological design and construction experience in our Tianfu Square in the vicinity of wells, depth of 15 meters, dewatering well spacing is 30 meters, a total of 12 wells in this section; few are provided for support the artificial dig hole pile, pile pile length is 15 meters from the ground, digging depth of 16 meters, so in these digging hole pile depth on both sides of the dewatering well corresponding to 20 meters; in the K0+560 design of reserved subway supporting pile, the pile in the tunnel under 13.5 meters (pile the bottom 21 meters from the surface), so the location of the precipitation depth should be 25 meters on both sides of the. 2. Well completion technical requirement and well location Layout of well location is shown in detail. The dewatering well shall be designed according to the design position. The construction site may be suitable for displacement according to the site conditions. The well site shall be kept away from the underground pipeline and shall be constructed after approval by the construction unit. The dewatering well shall reach the design depth, and the orifice shall be 0.30 to 0.50m higher than the ground, and the well depth shall be calculated from the orifice (which is made of brick as a well ring). The diameter of the well is not less than 550mm. The well shall remain upright and free from necking. Fill gravel gravel diameter 0.50 ~ 2.00cm, the bottom hole to the mouth 2m below should fill gravel, wellhead section can be filled with clay soil. The filter pipe is arranged in the lower tube, no sand pipe, filter pipe length not less than 5.00m on the filter pipe cas