问题 问答题

(一)

某城市桥梁工程项目,施工人员在大体积墩台及其基础施工时的部分施工工艺和方法如下:

(1)在墩台基础中埋放了厚度为120mm的石块,且埋放的数理为混凝土结构体积的20%。

(2)在浇筑混凝土时选择了一天中气温较高时进行。

(3)在后张有黏结预应力混凝土结构时,预应力筋的孔道采用钢管抽芯方法进行预留。

(4)预应力筋锚固完毕并经检验合格后用电弧焊切割外露预应力筋。

(5)施工中预应力筋采用应力控制张拉,在校验伸长值时,实际伸长值与理论伸长值的差值为8%。

问题

请逐条判断大体积墩台及其基础施工时的部分施工工艺和方法是否妥当如不妥,请改正。

答案

参考答案:

大体积墩台及其基础的部分施工工艺和方法妥当与否的判定:

(1)不妥。

正确做法:在墩台基础中埋放的石块的厚度不小于150mm。

(2)不妥。

正确做法:浇筑混凝土时应选择一天中气温较低时进行。

(3)正确。

(4)不妥。

正确做法:预应力筋锚固完毕并经检验合格后用砂轮机切除外露的多余预应力筋。

(5)不妥。

正确做法;预应力筋采用应力控制张拉时,应以伸长值进行校验,实际伸长值与理论伸长值的差值应控制在6%以内。

阅读理解

阅读理解。

    In most parts of the world, many students help their school make less pollution. They join in

"environment (环境) clubs". In an environment club, people work together to make our environment clean.

    Here are the things students often do.

    Turn off the water! Do you know that some toilets can waste (浪费) twenty to forty tons of water an

hour?

    In a year, that would fill a small river! In environment clubs, students mend those broken toilets.

    No-car day. On a no-car day, nobody comes to school in a car-not the students and not the teachers!

Cars give pollution to our air, so remember:

    Walk, jump, bike or run.

    Use your legs! It's lots of fun!

    No-garbage (垃圾) lunches. How much do you throw away after lunch? Environment clubs ask students

to bring their lunches in bags that can be used again. Every week they will choose the classes that make the

least garbage and report them to the whole school!

    We love our environment. Let's work together to make it clean!

1. After mending the broken toilets, they save            . [ ]

A. a small river

B. a lot of water

C. a toilet

D. a year

2. On a no-car day,             will take a car to school. [ ]

A. only students

B. only teachers

C. both students and teachers

D. neither students nor teachers

3. Environment clubs ask students            . [ ]

A. to run to school every day

B. to play sports every day

C. not to throw away lunch bags

D. not to forget to take cars

4. From this passage we know the students usually have lunch            . [ ]

A. at school

B. in clubs

C. at home

D. in shops

5. The writer wrote the passage to tell students to            . [ ]

A. join in clubs

B. help teachers

C. make less pollution

D. clean schools

填空题