现场安全资料实例（177）基坑支护施工方案十七

基坑支护施工方案十七

五、井点降水施工方案

1．基坑开挖前都必须经过井点降水，将基坑内水位降至基坑底以下1m左右，方可进行基坑开挖。本工程采用真空泵轻型井点降水，具体如下：

(1) 本工程基坑底位于第④层灰色淤泥质粉质粘土层中，该层土压缩性大,含水率大，渗透系数大，基坑局部采用深层搅拌桩围护，拟在基坑放坡范围以外用轻型井点进行井点降水。

(2) 基坑开挖后，再在基坑底四周设一套井点，插3m井点管，降水两周。

2．施工顺序及要求

(1) 挖沟铺管。挖约1.5m深的井点沟槽，然后铺设集水总管。

(2) 冲孔。用自来水冲出约6m深的孔（孔底标高在基坑底以下2m左右），确保井点影响半径内地下水位降至基坑底以下1m左右，孔径不小于300mm，孔距1.6m。

(3) 沉设井点管填砂滤料，砂料选用中粗砂，将井点管和集水总管连接好。

(4) 井点系统各部位均应安装严密，防止漏气，连接集水总管与井点管之间的弯联管采用软管。

(5) 每根井点管沉设后应检验其渗水性能。井点管和孔壁之间填砂时，管口应有泥浆冒出，或向管内灌水时，能很快下渗，方为合格。

(6) 井点系统安装完毕，必须及时进行试抽，并全面检查管路接头质量、井点出水情况和真空泵运转情况等，如发现漏气等现象，应立即处理，检查合格后，井点孔口到地面下0.5～1.0m范围内应用粘性土填实。

(7) 开始抽水后，每天早晚检查两次，发现漏气、堵塞等现象，应及时修补。

By:苏州愚人 | 阅读全文 | 回复(12) | 引用通告 | 编辑

标签：安全台账

圈子：注安之家

Re:在漫画中识别身边的违章 | 2017-2-20 0:02:31

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Re:在漫画中识别身边的违章 | 2017-2-18 0:22:54

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Re:在漫画中识别身边的违章 | 2016-10-14 14:18:18

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Re:在漫画中识别身边的违章 | 2016-10-7 23:41:32

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原创 | 2016-9-30 16:13:22

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原创 | 2016-9-28 21:32:18

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原创 | 2016-9-6 21:55:14

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