综合管沟混凝土工程施工技术交底.doc

交底内容：
1. 综合管沟及其附属工程的结构砼为C30防水砼，抗渗标号为S6，垫层为C15素砼。
2. 混凝土的保护层厚度：
综合管沟及其附属工程结构的地下结构：底板下层、壁板外侧和顶板上层为50mm，其余为30mm；
综合管沟及其附属工程结构的地上结构：梁、柱为35mm，板为25mm；
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标确定。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、预埋件、预留孔洞、止水带等进行检查，清除模板内杂物，隐蔽验收合格后，方可灌注混凝土。
5. 混凝土浇注过程中随时观测模板、支架、钢筋、预埋件和预留孔洞等情况，发现问题，及时处理。
6. 混凝土的浇注：本工程采用商品混凝土，并用流槽把砼从搅拌车直接卸到浇注地点。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。不同的分部混凝土施工分述如下：
(1).  底板混凝土浇注：
A.  底板厚300mm，混凝土强度等级为防水C30、抗渗等级为S6。在底板面以上500mm设置一水平施工缝，施工中间设镀锌钢板止水带，截面为300mm×3mm。
B.  在混凝土浇筑前24小时内对垫层进行洒水湿润，采用“一个坡度、分层浇筑、循序推进、一次到顶”的斜面分层法浇筑。
C.  每个施工段均选择沿管沟方向浇筑，逐层覆盖沿管沟方向推进。浇筑混凝土时保证每个工作面各有一个流槽。混凝土浇注要连续，一气呵成，不留任何竖向施工冷缝。
D.  浇筑混凝土时边浇筑边振捣，振动器插入方式可采用行列式或
Cards on the table contents:
1. Combined duct and its subsidiary structure of the project for the C30 concrete waterproofing concrete, impermeability grade for the S6, bedding factors for the C15 concrete.
2. Concrete cover thickness:
Combined duct and its subsidiary structure of the underground structure works: the lower floor, wall and roof lateral upper 50mm, the rest is 30mm;
Combined duct and its subsidiary engineering structures on the ground structure: beam, column for the 35mm, plate is 25mm;
3. Concrete Mixing: This project uses concrete, concrete configuration in strict accordance with the technical specifications to determine design requirements. Concrete mix to be determined by experiment, to reduce groundwater use cement and concrete on the steel corrosion.
4. Template before pouring concrete, steel, embedded parts, aside holes, water stop, etc. to inspect, remove the template debris, hidden acceptance only after the concrete pouring.
5. Concrete pouring at any time during the observation template, frame, steel, embedded parts, and set aside holes, etc., identify problems and timely treatment.
6. Concrete pouring: The project uses concrete, and concrete with a groove to direct discharge from the mixer to the pouring site. Concrete arrived at the scene, materials testing staff approved the departure time of concrete, concrete variety, intensity level, whether concrete slump within the limits prescribed, and do random sample testing and test block, a strict standard of concrete quality. Different segments of concrete construction are as follows:
(1). Bottom Pouring Concrete:
A. floor thickness 300mm, waterproof concrete strength grade C30, impermeability grade S6. 500mm above the floor surface to set a level of construction joints, the middle set galvanized steel water stop construction, the section is 300mm × 3mm.
B. 24 hours before pouring the concrete within the wet cushion for watering, using "a slope, hierarchical placement, sequential forward, once up to the ceiling" of the slope stratification placement.
C. Construction segment were chosen for each trench along the direction of casting, layer by layer along the trench direction of forward cover. When pouring concrete to ensure a flow of each face in each slot. Concrete pouring to be continuous, coherent, do not leave any vertical construction cold joints.
D. pouring concrete when pouring side edge vibration, vibrator insertion can be carried determinant or