第一卷 開槽埋管（PVC-U管）
1.開挖溝槽
1.1槽底寬度應(yīng)為管外徑+0.4m。
1.2溝槽開挖時(shí)，應(yīng)嚴(yán)格控制基底高程，不得超挖或擾動(dòng)基面。挖掘機(jī)挖至距基底20cm時(shí)，采用人工繼續(xù)開挖直至標(biāo)高。
1.3槽底不得受水浸泡。
1.4、開挖溝槽質(zhì)量標(biāo)準(zhǔn)：
1.4.1槽底松散土、淤泥、大塊石等雜物必須清除，保持槽底不浸水。
1.4.2溝槽允許偏差見表：
Vol slot buried (PVC-U tube)
1. Excavation trench
1.1 The bottom width of the pipe diameter should be +0.4 m.
1.2 The trench excavation should be strictly controlled basement elevation, excavation or disturbance shall not exceed the base plane. Excavator dug to 20cm from the base, the use of artificial continue excavation until the elevation.
1.3 shall be subjected to water immersion bottom.
1.4, trench excavation quality standards:
1.4.1 bottom loose soil, silt, large stones and other debris must be removed to maintain bottom is not flooded.
Table 1.4.2 Tolerance groove:

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