02輕型井點降水工程.doc
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一、 施工準備
（一） 施工機具
1、 管：φ38～55，壁厚為3.0mm的無縫鋼管或鍍鋅管，長2.0m左右，一端用厚為4.0mm的鋼板焊死，在此端1.4m長范圍內，在管壁上鉆φ15mm的小圓孔，孔距為25mm，外包兩層濾網，濾網采用編織布，外部再包一層網眼較大的尼龍絲網，每隔50～60mm用10號鉛絲綁扎一道，濾管另一端與井點管進行連接。
2、 井點管：φ38～55，壁厚為3.0mm的無縫鋼管或鍍鋅管。
3、 連接管：透明管或膠皮管，與井點管和總管連接，采用8號鉛絲綁扎，應扎緊以防漏氣。
4、 總管：φ75～102鋼管，壁厚為4.0mm，用法蘭盤加橡膠墊圈連接，防止漏氣、漏水。
5、 抽水設備：根據設計配備離心泵、真空泵或射流泵，以及機組配件和水箱。
6、 移動機具：自制移動式井架(采用舊設備振沖機架)、牽引力為6t的絞車。
7、 鑿孔沖擊管：φ219×8的鋼管，其長度為10m。
8、 水槍：φ50×5無縫鋼管，下端焊接一個φ16的槍頭噴嘴，上端彎成大約直角，且伸出沖擊管外，與高壓膠管連接。
9、 蛇形高壓膠管：壓力應達到1.50MPa以上。
10、 高壓水泵：100TSW-7高壓離心泵，配備一個壓力表，作下井管之用。
（二） 材料
粗砂與豆石，不得采用中砂，嚴禁使用細砂，以防堵塞濾管網眼。
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.