04無砂大孔混凝土管井降水工程.doc

一、 工藝特點
沿高層建筑基礎或在地下水位以下的建筑物基坑的四周采用泥漿護壁循環鉆機成孔，然后每隔一定距離埋設一個無砂大孔混凝土管井，形成環狀布置，從單孔管井用潛水泵抽水至連續總管內，然后排至沉淀池內，再排送至污水管井。
二、 材料、機械準備
濾水井管、循環成孔鉆機、潛水泵、吸水管、空壓機、排水管、水泵控制自動系統、3～5mm豆石、木底座或混凝土底座、瀝青、麻布等。
三、 施工準備
1、 首先要了解地質勘探資料、掌握地下土質和水位變化情況，特別是地下流砂層情況，以便確定鉆孔工藝和準備必要材料。
2、 根據總的平面布置和所開挖地下工程的面積，確定正式管井和觀測管井的數量、位置，排水管位置流向，沉淀池位置以及與污水管道連按地點。
3、 對設置井點位置進行平整、放線，用白次標明其位置。
四、 管井構造
管井的濾管為無砂大孔混凝土管，采用粒徑為3～5mm的豆石加水泥按6:1左右比例預制而成，

First, technological features
High-rise buildings along the base or foundation in the ground water level around the building below the Wall by mud circulation drill hole, and then at regular intervals from the laying of a concrete tube wells without sand big hole to form a circular arrangement, from the single-hole tube well with submersible pump to continuous pumping mains, the then exclusive to the sedimentation tanks, and then sent to waste water tube wells row.
Second, materials, mechanical preparation
Treatment well pipe, circular hole drilling, submersible pumps, suction, air compressors, pipes, pumps automatic control systems, 3 ~ 5mm bean stone, wood base or concrete base, asphalt, linen, etc..
Third, construction preparation
1, we must first understand the geological exploration data, soil and underground water level control, especially in dirty sand in order to determine drilling process and prepare the necessary materials.
2, according to the general layout of underground excavation works and the area to determine the official number of tube wells tube wells and observation, location, location of drainage flow, sedimentation tanks and sewer locations, and even by location.
3, set well point position on the formation, laying and marked its position with a white sub.
4, tube well construction
Tube wells without sand filter tube macroporous concrete pipe, with diameter of 3 ~ 5mm of beans stone with precast concrete made according to the proportion of about 6:1,

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