箱涵混凝土技术交底.doc

交底内容：
1. 本箱涵（K9+535.284）的结构砼为C30砼，抗渗标号为S6，垫层为C10素砼。
2. 混凝土的保护层厚度：底板为40mm，墙、顶板为35mm；
3. 混凝土配制：本工程采用商品混凝土，混凝土配置严格按设计要求的技术指针确定。混凝土配合比必须经试验确定，水泥的选用要减小地下水对钢筋及混凝土的腐蚀。
4. 混凝土浇注前对模板、钢筋、端头止水带等进行检查，清除模板内杂物，隐蔽验收合格后，方可灌注。
5. 混凝土浇注过程中随时观测模板、支架、钢筋等情况，发现问题，及时处理。
6. 混凝土的浇注：本工程采用泵送商品混凝土，混凝土到达现场后，材料试验员核准混凝土发车时间，混凝土的品种、强度等级，混凝土坍落度是否在规定的范围内，并随机取样测定和做试块，严格把好混凝土的质量关。不同部分混凝土施工分述如下：
(1).  底板混凝土浇注：
A.  底板厚400mm，混凝土强度等级为防水C30、抗渗等级为S6。在底
Cards on the table contents:
1. The box culvert (K9 +535.284) the structure of concrete for the C30 concrete, impermeability grade for the S6, bedding factors for the C10 concrete.
2. Concrete cover thickness: bottom is 40mm, wall, roof is 35mm;
3. Concrete Mixing: This project uses concrete, concrete configuration in strict accordance with design requirements of the technical indicators to determine. Concrete mix to be determined by the test, the choice of cement to reduce water corrosion on steel and concrete.
4. Template before pouring concrete, steel, end of the first water stop, etc. to inspect, remove the template debris, hidden acceptance only after the infusion.
5. Concrete pouring at any time during the observation template, frame, steel, etc., identify problems and timely treatment.
6. Concrete casting: The use of premixed concrete construction, concrete arrived at the scene, material testing of concrete members approved departure time, the variety of concrete strength grade, whether concrete slump within the limits prescribed, and random sample testing and do try block, a strict standard of concrete quality. Different parts of the concrete construction are as follows:
(1). Bottom Pouring Concrete:
A. floor thickness 400mm, waterproof concrete strength grade C30, impermeability grade S6. In the end