箱涵土方開挖、回填技術交底.doc

交底內容：
一、土方開挖：
1.  溝槽開挖前的準備工作：
(1).  根據設計圖紙的設計要求進行測量放線，定出中心樁、槽邊線。
(2).  先查明段地下管線及其它地下構筑物情況，會同有關部門作出妥善處理，確保施工安全
(3).  溝槽開挖前應做好溝槽外四周的排水工作，保證場外地表水不流入溝槽。
(4).  按工程監測要求，開挖前先布置各種類型的觀測點，并測定初始資料。
(5).  準備好所有的機械設備及場內外運輸道路，以利土方開挖工作連續快速完成。
2.  溝槽開挖方法：
(1).  開挖方式以機械開挖為主，人工開挖進行配合。土方采用分段分層開挖的方式進行，開挖深度3.0m以內的采用挖掘機一次開挖至距溝槽底20.0cm，開挖深度超過3.0m的，采用挖掘機分兩次開挖至距溝槽底20.0cm，挖出的土方用自卸運土車運至指定余泥堆場。
(2).  溝槽基底標高以上20cm的土層，采用人工開挖、清理、平整，以免擾動基底土，嚴禁超挖。
溝槽開挖過程中，不同土層面標高須報驗監理、業主確認，并做好
Cards on the table contents:
1, earth excavation:
1. Trench excavation preparatory work before:
(1). According to the design drawings of the design requirements for measuring and setting out, set the Pile, groove edges.
(2). First identify the section of underground pipelines and other underground structures in the situation, together with relevant departments to provide appropriate treatment to ensure the construction safety
(3). Trench excavation should be prepared prior to the drainage trench around the outside work to ensure that surface water does not flow outside the trench.
(4). According to project monitoring requirements, layout of various types of excavation prior to the observation point, and the determination of the initial data.
(5). Ready for all the mechanical equipment and OTC road transport to facilitate the rapid completion of a continuous earth excavation work.
2. Trench excavation methods:
(1). Excavation by mechanical excavation of the main excavated to meet. Sub-layer earth by way of excavation, the excavation depth of less than 3.0m with an excavator from the trench excavation to the end of 20.0cm, excavation deeper than 3.0m, the use of excavators digging in two to from the trench bottom 20.0cm, earthwork excavated earth with dump trucks to the named Yuni yard.
(2). Trench 20cm above the basement level of the soil, using artificial excavation, clearing, leveling, to avoid disturbance of soil substrate, is strictly prohibited overbreak.
Trench excavation, the different levels of soil test level shall be reported to the Commissioner, the owners recognized and well
 

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