问题 问答题

某城市桥梁工程,采用钻孔灌注桩基础,承台最大尺寸: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。
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口头交底,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左右。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。在后续的承台、梁体施工中,施工单位采取了以下措施:
(1)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)混凝土浇筑安排在一天中气温较低时进行。
2)根据施工正值夏季的特点,决定采用浇水养护。
3)按规定在混凝土中适量埋入大石块。
(2)项目部新购买了一套性能较好、随机合格证齐全的张拉设备,并立即投入使用。
(3)跨越既有道路部分为现浇梁施工,采用支撑间距较大的门洞支架。为此编制了专项施工方案。并对支架强度作了验算。
问题
1.指出项目技术负责人在桩身混凝土浇筑前技术交底中存在的问题,并给出正确做法。

答案

参考答案:防治措施:减少浇筑层厚度;优先选用水化热较低的水泥;在保证混凝土强度等级的前提下,减少水泥用量,冷却集料或加入冰块;在混凝土中埋设冷却水管,通水冷却;采取温控措施,加强测温工作并实施监控。

阅读理解

阅读理解。

     Long ago, people in Rome talked to one another in Latin (拉丁文). Pupils in school learned to read

  and write in Latin. Books are in Latin.

     Some Romans went to other parts of the world. They took their language with them. Soon Latin was

 used in many countries. It became a world language. People in other countries did not talk in Latin the

 same way. In each land, they made more changes. At last they did not talk in Latin any more. New

 languages had come from the old one.

     People don't talk to one another in Latin today, but they still use many Latin words. You do, too.

 Street, wall, city, and salt are some of the Latin words we use. You are a pupil in school. Pupil is a

 Latin word. It means "little doll."

1. Latin was used by people in _____ long ago.

    A. Rome          

    B. the United States  

    C. Greece        

    D. Texas

2. The word in the passage that means what people speak and write is _____ .

    A. maths        

    B. Chinese  

    C. English        

    D. language

3. Which of the following does this passage lead you to believe?

    A. It is not good to change a language.

    B. Most of people could read Latin many years ago.

    C. Many people can read Latin today.

    D. Pupils in schools today play with dolls.

4. What happened to Latin when it was taken to other countries at the beginning?

    A. In each land, they changed the language a little.

    B. In each land, they changed the language a lot.

    C. In each land, people t, dked about each other.

    D. In each land, the children had to speak some Latin.

5. The main idea of the whole passage is that

    A. people in old Rome talked a lot to each other.

    B. Romans did not like to stay at home.

    C. although Latin moved from land to land, it didn't change.

    D. Latin changed as it moved from land to land.

选择题