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

2011 is a special year all the people in Shenzhen. The 26th World Universiade will be held in the city from August 12th to 23rd.

As we all know, "Start Here'' is the slogan of this great event. Does anyone know that a new life of two giant pandas will start here as well?

Shenzhen is expecting the pair of pandas for the Summer Univcrsiade. The pandas, a male and a female from Wolong Panda Research Center in Sichuan Province, will be "Universiade Pandas", just like "Asian Games Pandas" and "Olympic Pandas".

Shenzhen Safari Park will rebuild its panda house to welcome the pandas. The panda house has  been empty since another panda, Yongba, 25. was returned to Sichuan in 2009 because it was too old.

How old are the Universiade Pandas? What are their names? What are they like? What are their living habits? We will find out the answers in June when they arrive.

小题1:The 26th World Universadc will begin on           .

A.August 12th

B.August 23rd

C.September 12th

D.September 23rd小题2:The pair of pandas comes from            .

A.Shenzhen

B.Sichuan

C. Guangzhou

D.Beijing小题3: Yongba is a(n)       .

A.Universiade Panda

B.Asian Games Panda

C.Olympic Panda

D.panda that used to live in Shenzhen Sal at Park小题4:From the passage we can know the __ of the Universiade Pandas.

A.arrival time

B.ages

C.names

D.living habits小题5:The passage tells us that_.

A.the slogan of the 26th World Universiade is "Just Do It"

B.there will be two male pandas coming to Shenzhen

C.Yongba left Shenzhen in 2009

D.Wolong Panda Research Center will build a panda house for the Universiade Pandas

单项选择题