02轻型井点降水工程.doc

一、 施工准备
（一） 施工机具
1、 管：φ38～55，壁厚为3.0mm的无缝钢管或镀锌管，长2.0m左右，一端用厚为4.0mm的钢板焊死，在此端1.4m长范围内，在管壁上钻φ15mm的小圆孔，孔距为25mm，外包两层滤网，滤网采用编织布，外部再包一层网眼较大的尼龙丝网，每隔50～60mm用10号铅丝绑扎一道，滤管另一端与井点管进行连接。
2、 井点管：φ38～55，壁厚为3.0mm的无缝钢管或镀锌管。
3、 连接管：透明管或胶皮管，与井点管和总管连接，采用8号铅丝绑扎，应扎紧以防漏气。
4、 总管：φ75～102钢管，壁厚为4.0mm，用法兰盘加橡胶垫圈连接，防止漏气、漏水。
5、 抽水设备：根据设计配备离心泵、真空泵或射流泵，以及机组配件和水箱。
6、 移动机具：自制移动式井架(采用旧设备振冲机架)、牵引力为6t的绞车。
7、 凿孔冲击管：φ219×8的钢管，其长度为10m。
8、 水枪：φ50×5无缝钢管，下端焊接一个φ16的枪头喷嘴，上端弯成大约直角，且伸出冲击管外，与高压胶管连接。
9、 蛇形高压胶管：压力应达到1.50MPa以上。
10、 高压水泵：100TSW-7高压离心泵，配备一个压力表，作下井管之用。
（二） 材料
粗砂与豆石，不得采用中砂，严禁使用细砂，以防堵塞滤管网眼。
First, construction preparation
(A) construction equipment
1, pipe: φ38 ~ 55, the seamless steel pipe wall thickness of 3.0mm or galvanized pipe, about 2.0m long, one end with a thick steel plate welded to 4.0mm, 1.4m long on this side, within the wall small hole drilled φ15mm, pitch is 25mm, outsourcing two filters, filters using fabric, a layer of external re-package larger nylon mesh screen, every 50 ~ 60mm wire banding together with 10, the other side of the filter tubes connect with the well point.
2, well point tube: φ38 ~ 55, the seamless steel pipe wall thickness of 3.0mm or galvanized pipe.
3, connecting tubes: transparent tubes or hoses, and the well point and mains connection, using 8 wire banding shall be fastened to prevent leakage.
4, Explorer: φ75 ~ 102 pipe, wall thickness of 4.0mm, with additional rubber gasket flange connections to prevent air leakage, water leakage.
5, pumping equipment: According to the design with pump, vacuum pump or jet pump, as well as accessories and tank units.
6, moving machinery: self-made mobile rigs (using old equipment rack of vibration), traction winch for the 6t.
7, perforated shock tube: φ219 × 8 of the pipe, its length is 10m.
8, water gun: φ50 × 5 seamless steel tubes, welded a bottom nozzle φ16 of its action, the top bent approximately at right angles, and extend the impact of controls, and high pressure hose connection.
9, snake-like high pressure hose: the pressure should reach more than 1.50MPa.
10, high pressure pumps: 100TSW-7 high-pressure pump, equipped with a pressure gauge for use in well control.
(B) material
Sand and stone beans, not used in the sand, do not use sand to avoid blocking filter control mesh.