某城市桥梁工程,采用钻孔灌注桩基础,承台最大尺寸为长8m、宽6m、高3m,梁体为现浇

题型:问答题 案例分析题

问题:

某城市桥梁工程,采用钻孔灌注桩基础,承台最大尺寸为长8m、宽6m、高3m,梁体为现浇预应力钢筋混凝土箱梁。

跨越既有道路部分,梁跨度30m,支架高20m。

其他段为预制混凝土梁。

桩身混凝土浇筑前,项目技术负责人到场就施工方法对作业人员进行了交底,随后立即进行1号桩桩身混凝土浇筑,导管埋深保持在0.5~1.0m。浇筑过程中,拔管指挥人员因故离开现场。

后经检测表明1号桩出现断桩。

模板、支架搭设及拆除工作由项目部分包给某劳务公司,双方签订了劳务分包合同。

在合同实施过程中,发生了如下事件:

(1)为避免引起模板变形,模板与脚手架进行连接;

(2)分包商对于其分包现场的支架、脚手架等安全防护设施根据施工需要自行移动或拆除,结果发生了一起安全事故。

在后续的承台施工中,施工单位采取了措施。

因施工正处夏季,针对承台大体积混凝土施工编制了专项方案,采取了如下防裂缝措施:

(1)用改善集料级配、降低水灰比等方法减少水泥用量;

(2)减少浇筑层厚度,加快混凝土散热速度;

(3)混凝土用料遮盖,避免日光暴晒。

吊装预制梁过程中,项目部要求所有起重操作人员必须持证上岗,并进行了安全交底。

为加快进度,吊装过程中采用物料提升机载运部分人员到墩顶作业。

补充大体积混凝土裂缝防治措施。

考点:市政公用工程(二建)市政公用工程综合练习市政公用工程综合练习题库
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There may be good feelings too—it’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think—a better job may be just around the corner. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely.
Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’s up to you.

Unemployment almost always brings changes that are ______.

A.unpleasant

B.unsuitable

C.untenable

D.unworthy

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如果企业使用的生产要素从完全竞争市场上购入,生产的商品在完全竞争市场上出售,则其边际成本与边际收益都是常数。

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3011+149+288+5051=( )

A.8500

B.8499

C.8399

D.8409

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A.聋哑儿

B.佝偻病

C.牙齿黑染

D.骨骼脱钙和生长障碍

E.骨骼和骨干过早闭合

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