问题 问答题 简答题

试述利用桅杆采用滑移法吊装塔类设备的过程控制。

答案

参考答案:

利用桅杆采用滑移法吊装塔类设备,一般可划分为始吊、提升滑移、脱排、拔高上基础和就位五个阶段.始吊时,如设备前方严格限定前移,则应加大溜尾力,待设备抬头之后,稍回溜尾,以理顺受力.如设备前方有前移余地,则应适度控制溜尾初拉力.

提升滑移阶段,在可能的情况下,尽量保持小主吊张角.如果设有前牵引滑轮组,注意其和溜尾滑轮组的协调.设备轴线与水平面夹角超过45度之后,注意主吊提升和溜尾回送的协调,避免过早脱排或出现尾排故障.提升滑移阶段的全过程,应时刻关注设备的通过空间.

脱排时,无特殊情况,应在即定位置脱排.提升、溜尾等动作宜分解进行,过程应缓慢,避免设备尾部出现突然而大幅度摆动.如预测有此种情况,应采取措施予以控制.最终决定脱排之前,应判定系统无异常.脱排之后,无极特殊情况,不宜将设备再回落到尾排上.

拔高上基础时,溜尾控制以设备不碰基础为宜,尽量避免无故停顿.就位时经周密观察和考虑,以确定恰当而必要的辅助措施,避免忙乱。

阅读理解

阅读理解。

  I am an English teacher in an international school. I have students from all

over the world. Let me tell you about my favorite students.

  Matt comes from New York. He loves rap music. When he walks between 

classmates, they respect (尊敬) him because he's big for his age. In his free time

he often watches action movies and practices kung fu. Today he takes part in a

kung competition.

  Kate is another one of my favorite students. She is a tall, beautiful girl from

London. She is a good student and she's always studying. Sometimes she can't

sleep because she thinks too much about her lessons. Her favorite sport is

swimming. She says she wants to be a doctor when she leaves school. I hope

she will succeed!

1. Where' are the students in the international school from?

A. New York.              

B. London.

C. All over the world.      

D. America.

2. What does Matt do today?

A. He practices kungfu.

B. He joins in a kung competition today.

C. He takes an exam.

D. He watches an action movie.

3. Why do Matt's classmates respect him?

A. Because he is old.

B. Because he is thin for his age.

C. Because he is tall and strong for his age.

D. Because he is a dangerous boy.

4. What country does Matt come from?

A. England.                  

B. France.

C. The USA.                  

D. China.

5. What problem does Kate have?

A. Sometimes she can't go to bed.

B. Sometimes she can't fall asleep.

C. She is a good girl.

D. She is always studying.

单项选择题