綜合管溝溝槽開挖、回填施工技術交底.doc
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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). 先查明開挖段的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). 土方開挖采用放坡開挖，放坡系數為1：0.5，噴射10cm厚素混凝土硬化坡面。
(2). 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。
(3). 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。
(4). 溝槽開挖過程中，不同土層面標高須報驗監理、業主確認，并做好記錄。
(5). 土層與設計不符時，及時通知設計、監理單位，由設計、監理及施工單位共同商討處理方法。
3. 溝槽排水措施：
(1). 在溝槽外設置排水溝和集水井，截止溝槽外地表水流入溝槽，集水井內的污水經沉淀后排放。
(2). 開挖時基底設置臨時排水溝，排水溝的截面尺寸為200mm×300mm，沿著臨時排水溝每隔20m設置600mm×600mm×800mm的集水井，采用潛水泵把集水井的水抽出溝槽外
(3). 在溝槽開挖過程中出現的滲漏水應及時進行處理，處理的方法為：
A. 滲漏水較少時，直接封堵；
B. 滲漏水較大時，在溝槽外側施工擺噴或灌漿止水。
4. 開挖后的土方如達到回填質量要求并經監理確認后應用于填筑材料，不適用于回填的土料棄于業主、監理指定地點。
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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). The first paragraph to identify the underground excavation of underground pipelines and other 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). Earthwork excavation by sloping excavation, up slope coefficient of 1:0.5, jet 10cm thick plain concrete hardening slope.
(2). 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.
(3). Trench 20cm above the basement level of the soil, using artificial excavation, clearing, leveling, to avoid disturbance of soil substrate, is strictly prohibited overbreak.
(4). Trench excavation, the different levels of soil test level shall be reported to the Commissioner, the owner recognized, and well recorded.
(5). Soil and design does not comply, promptly notify the design, supervision units, from the design, supervision and construction of the unit to discuss treatment.
3. Trench drainage measures:
(1). Set in a trench drain and set well outside the cut-off trench into the trench field surface water, catchment wells after the discharge of sewage by sedimentation.
(2). Excavating the basement when temporary drainage ditches, drainage ditches cross-sectional dimensions of 200mm × 300mm, 20m to set up temporary drains every 600mm × 600mm × 800mm set of wells, wells with submersible pumps the water out of Baji outside groove
(3). In the groove leakage occurred during excavation should be disposed of water, treatment methods are:
A. less leakage of water, the direct closure;
B. water leakage is large, the construction placed in a trench outside the spray or grouting sealing.
4. Excavation to backfill of earth, such as quality requirements and confirmed by the Commissioner of filling material used, does not apply to the backfill soil material abandoned in the owner, supervision and designated locations.
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