轨道板自密实混凝土施工.doc
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1、 轨道板自密实混凝土施工1.1 施工配合比混凝土拌制前,应将所用砂石材料用装载机拌匀,再从不同部位取适量有代表性的砂石材料进行的含水率检测,由于轨道板自密实混凝土对用水量十分敏感,故在测砂石材料含水率时要经过两次复测,测得的结果误差超过1%时要进行更多次的复测,直至准确。将选定的理论配合比换算成施工配合比,计算每盘混凝土实际需要的各种材料量,并下达施工配料通知单送交拌合楼进行混凝土的拌制。混凝土配料必须根据下达的施工配料通知单进行,配料采用全自动计量系统计量,并在微机上做好记录。一般情况下,含水量每班抽测两次,雨天随时抽测,并按测定结果及时调整混凝土施工配合比。混凝土开盘前,模板安装、钢筋安装
2、与工序的检查、签证手续完备齐全,如没有签证或签证手续不齐不允许开盘。1.2 轨道板自密实混凝土拌合技术要求1.2.1在配制轨道板自密实混凝土拌合物时,混凝土原材料严格按照施工配合比要求进行准确称量,水、胶凝材料、外加剂的质量用量误差为1;砂、石料的质量用量误差为2;1.2.2轨道板自密实混凝土拌制过程中,须对轨道板自密实混凝土拌和物的坍落扩展度进行测定,坍落度须满足轨道板自密实混凝土要求。如不符合要求应立即进行调整。1.2.3 轨道板自密实混凝土拌合物入模温度须控制在530。1.2.4 搅拌时,先向搅拌机投入细骨料、水泥、掺和料和外加剂,搅拌1分钟后,再加入所需用水量及外加剂,再搅拌2分钟,总
3、搅拌时间为3-4min。1.3 轨道板自密实混凝土的运输每次罐车停放到搅拌机料口之前应快速反转,把罐子里面的水放完,轨道板自密实混凝土的运输速率应保证施工的连续性,当罐车到达浇筑现场时,应使罐车高速旋转2030s方可卸料。运输自密实混凝土过程中,应保持运输混凝土的道路平坦通畅,确保混凝土在运输过程中能够保持均匀性,运到浇筑地点不发生分层、离析和泌浆等现象。应对运输设备采取保温隔热措施,防止局部混凝土温度升高(夏季)或受冻(冬季)。应采取适当措施防止水份进入运输容器或蒸发,严禁在运输过程中向混凝土内加水。应尽量减少自充填混凝土的转载次数和运输时间。1.4 轨道板自密实混凝土浇注轨道板自密实混凝土
4、必须快灌快运,禁止搅拌后的混凝土过长时间停留,以免坍落度损失过大。灌注自充填混凝土前,应检查轨道板四周模板的密封情况、排浆孔的设置情况,并检查轨道板之间横向边缝的密封情况,确保模板和边缝密封不漏浆。灌注自充填混凝土前,应确认轨道板标高及轴向平顺满足要求,检查千斤顶的受力状态及其紧固程度,确定封边模具的支护安全可靠时方允许灌注。在灌注前,应采用高压雾化水对轨道板底面进行润湿,并应确保土工布上不得有明显积水。自充填混凝土灌注前,应检测混凝土拌和物的温度、坍落扩展度、泌水率和含气量等;只有拌合物性能符合设计要求或配合比要求时方可灌注。自充填混凝土的入模温度宜控制在530。每工作班至少测温3次并填写测
5、温记录。自充填混凝土灌注宜采用自动化程度高、施工便捷的灌注设备,灌注设备应经过现场验证。灌注时应通过料仓及连接料仓的下料管注入,自由倾落高度不宜大于1.0m 。自密实混凝土灌注速度不宜过快,宜采取慢-快-慢方式灌注,应保证下料的连续性和混凝土拌合物在轨道板下的满空间连续流动。自充填混凝土从搅拌开始到灌注结束的持续时间不宜超过90min。在炎热季节灌注自充填混凝土时,应避免模板和混凝土直接受阳光照射,保证混凝土入模前模板和钢筋的温度以及附近的局部气温均不超过40。在低温条件下(当昼夜平均气温低于5或最低气温低于-3时)灌注自充填混凝土时,应采取适当的保温防冻措施,防止混凝土早期受冻。在相对湿度较
6、小、风速较大的环境下灌注自充填混凝土时,应采取挡风等措施,防止混凝土失水过快。1.5轨道板自密实混凝土检验频率和取样数量: 序号 检验项目 检验频次及数量 1 坍落扩展度 在配合比试验时检验一次。 搅拌站首盘混凝土。 每罐车取样检验一次。 2 T50时间 3 泌水率 4 含气量 在配合比试验时检验一次。 搅拌站首盘混凝土。 每100m3至少取样检验一次。 5 BJ高差 在配合比试验时检验一次。 6 H2/H1 7 竖向膨胀率 8 56d抗压强度 在配合比试验时检验一次。 每班次至少取样检验一次。 每50m3混凝土至少取样检验一次。 4制作试件不少于5组 5抗压强度试件用自密实混凝土应从混凝土运
7、输罐车中抽取,采用标准养护方式养护。 9 56d抗折强度 在配合比试验时检验一次。 相对应试验制作试件不少于1组 每1000m3混凝土至少取样检验弹性模量一次。 10 56d弹性模量 11 56d电通量 12 56d 28次冻融循环剥落量 13 56d干燥收缩值 1.6 拆模与养护自充填混凝土灌注完成后,应及时养护,自密实混凝土带模养护时间不得少于3d,强度达到10.0MPa以上方可拆模,且其表面及棱角不因拆模而受损。混凝土养护时间不得少于14天。养护用水与自充填混凝土表面温度之差不得大于15。拆模宜按立模顺序逆向进行,不得损伤轨道板四周混凝土,并减少模板破损。当模板与自充填混凝土脱离后,方可
8、拆卸、吊运模板。拆模后,应采取土工布包裹、养护膜覆盖或喷养护剂等保湿和保温养护措施。在冬季和夏季拆模后,若天气产生骤然变化时,应采取适当的保温(冬季)隔热(夏季)措施。冬期施工期间,自充填混凝土强度达到15MPa之前不得受冻。当自充填混凝土达到100%的设计强度后,轨道板方可承受全部设计荷载。organization system and working mode, the selection of a number of municipal strengthening group to build innovation and strengthen the organization of t
9、he basic level organizations advanced model.(seven) the manual work of the Communist Youth League Organization published and League branch of manual work, to promote the use of two manuals in the citys organizations at various levels. The county committee, directly under the group (work) is under th
10、e jurisdiction of grassroots League and group (total) using branch ratio shall not be less than 70%.Three, to further strengthen the groups leadership and team building(a) to strengthen the leagues leadership at all levels of construction. Continue to do a good job of municipal Party Committee Organ
11、ization Department on the strengthening of the Communist Youth League cadres management opinions implementation. To promote the group counties (autonomous counties, cities) Commission and city directly under the group (workers) appointed to carry out the Five team building activities. Improve the Le
12、ague Association Department working mechanism. Conscientiously fulfill the duties of CO, combined with the city group directly under (the) Committee of the general election and the adjustment, actively jointly with the unit where the party organization department good group leadership selection with
13、 the work. Do a good job in municipal Party committee assistant committee leadership and leading cadres of the annual assessment work, adhere to and improve the assistant secretary of the Communist Youth League talk system group To weave individual conversation and collective conversation, to streng
14、then the committees of all levels, the Standing Committee of the Standing Committee, the establishment of a sound system of central group learning, the system of investigation and study, the system of important issues and the reporting system.(two) to strengthen the work of education and training of
15、 cadres to conscientiously implement the Central Committee. On the implementation of grassroots cadres training project and opinions on carrying out the mission municipal CYL Cadres training project implementation opinions, full implementation of the project of the City Youth League cadres training
16、education. Focus on the county grassroots cadres and workers focused on training, the new school system vocational training League cadres, for the Municipal Organization Department jointly held the third session of the Communist Youth League system training cadres in party. Focusing on the construct
17、ion of new socialist countryside, strengthening village cadres and rural construction team group member of the young team, the county organizations at various levels throughout the year is expected to train 100 00 rural grassroots cadres, plans to train 1000 village secretary of the village Party br
18、anch.(three) actively promote grassroots cadres election work. Under the unified leadership of the party organization, to strengthen grassroots organizations direct work, standardize the election work rules and procedures, in the designated candidate, open competition to democratically elected branc
19、h secretary at the same time, actively and steadily the development of Township, streets and other grassroots organizations in the direct election of the pilot work, on the basis of summarizing the experience and gradually expand the scope of the pilot, and gradually formed a set of measures and cad
20、res election system.(four) to strengthen the cadres testing exercise. To study the development of XX city from 2006 to 2008 cadres testing exercise planning. To select outstanding cadres to the central mission in Beijing, Shanghai, Guangzhou and other central organs and sending work in developed are
21、as. With the Central Committee the implementation of the western region and ethnic minorities cadres training plan . To carry out the eighth batch of municipal organs attachment cadre management, selection, training work. The outstanding cadres to start the National Development Bank XX branch testin
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- 关 键 词:
- 轨道 密实 混凝土 施工
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