混凝土箱涵施工技术.rar

混凝土箱涵施工
8.5.1整体施工方案:
8.5.1.1基坑开挖深度约5m。基坑边坡坡度1∶1。
8.5.1.2采用木模板，钢支撑。模板经过设计后，在加工场地制作好，运至现场安装。两模板之间用对拉螺栓连接。对拉螺栓用Φ12的钢筋制作(中间设止水钢板)，上下左右间距均为80cm。
8.5.1.3箱涵混凝土似分两次浇注，先浇注底板混凝土，后浇注侧墙和顶板混凝土。施工缝设在底板以上30cm处，缝中安装镀锌钢板止水片。
8.5.1.4施工的重点是后浇部分，而后浇部分的施工重点是侧墙混凝土浇注。后浇部分的侧墙深度为3m，且顶板钢筋密布，浇注振捣十分困难。混合料用串筒送入模板中，每间隔1.5m移动一次串筒。串筒处的顶板钢筋先不绑扎，便于安放串筒。待侧墙混凝土浇注完毕后，再绑扎钢筋。
8.5.1.5侧墙混凝土以50cm的层厚逐层浇注。混合料从一端向另一端均匀地送入模板中，定人定位用插式振动棒振捣。每层均按先边墙，后中墙，再另一边墙的顺序，依次轮流浇注振捣。
8.5.1.6侧墙浇注完成后，紧接着浇注顶板混凝土。从一端向另一端一次浇注成形。
8.5.1.7在顶板最后一道收浆后，用麻袋覆盖，人工浇水养护14d。
8.5.1.8非承重模板3d后拆除，承重模板14d后拆除。
8.5.2施工注意事项:
8.5.2.1现场当场取样,对混凝土试块进行抗压、抗渗试验。
8.5.2.2检查地基承载力情况,基底土质为粘土，开挖基坑后，由质量监督站取三处土样进行试验。
8.5.2.3箱涵两侧按规定设有排水边沟和积水井，用水泵及时抽出积水。砼人工浇水养护不能对地基产生影响。
8.5.2.4对支架进行检查,防止因支撑不牢，混凝土在没有达
Concrete Box Culvert Construction
8.5.1 Overall construction program:
8.5.1.1 excavation depth of about 5m. Pit slope gradient of 1:1.
8.5.1.2 use of formwork, steel support. Template by design, the production of good in the processing site, transported to the site installation. Between the two templates to use and bolt connections. And bolt of steel production with Φ12 (middle set seal plate), vertical and horizontal spacing are 80cm.
8.5.1.3 twice like pouring concrete culvert, first pouring of concrete floor, side walls and the roof after the pouring of concrete. Construction joint located at 30cm above floor office, installation of galvanized steel sealing gap of the film.
8.5.1.4 Construction of part of the focus is poured, and then poured some of the side walls of concrete construction focuses on pouring. Some of the side walls after pouring a depth of 3m, and the roof bar sky, casting vibrators very difficult. Mixture into the cylinder with a series of templates, each interval of 1.5m move a string tube. String steel tube to the roof to not bandage, easy to place string tube. After the side walls of concrete to be poured, and then steel banding.
8.5.1.5 side wall of thick layer of concrete poured to 50cm. From one end to the mixture evenly into the other end of the template, and personnel positioning with plug vibrator vibrators. EMS or wall on each floor, then the wall, and then the other side wall of the order, followed by vibration casting rotation.
8.5.1.6 side wall casting is completed, followed by pouring concrete roof. From one end to the other end forming a cast.
8.5.1.7 pulp in the roof after the last one received, covered with sacks, artificial water conservation 14d.
8.5.1.8 After the removal of non load-bearing template 3d, 14d, after loading the template removed.
8.5.2 Construction Notes:
8.5.2.1 sampling site on the spot, on the concrete block for compression, permeability test.
8.5.2.2 Check bearing capacity situation, as the clay soil base, excavation pit, by the Quality Supervision Station to take three soil samples to test.
8.5.2.3 culvert on both sides with drainage ditches and in accordance with the provisions of water wells, water pump out water in time. Concrete artificial water conservation can not be an impact on the ground.
8.5.2.4 examine the stent, to prevent the support is not strong because of the concrete in the absence of up to