问题 问答题 案例分析题

某沿海城市电力隧道内径为3.5m,全长4.9km,管顶覆土厚度大于5m,采用顶管法施工,合同工期1年,检查井兼作工作坑,采用现场制作沉井下沉的施工方案。电力隧道沿着交通干道走向,距交通干道侧石边最近处仅2m左右。离隧道轴线8m左右,有即将人地的高压线,该高压线离地高度最低为15m。单节混凝土管长2m、自重10t,采用20t龙门吊下管。隧道穿越一个废弃多年的污水井。上级公司对工地的安全监督检查中,有以下记录:(1)项目部对本工程作了安全风险源分析,认为主要风险为正、负高空作业,地面交通安全和隧道内施工用电,并依此制定了相应的控制措施。(2)项目部编制了安全专项施工方案,分别为施工临时用电组织设计,沉井下沉施工方案。(3)项目部制定了安全生产验收制度。

针对本工程,安全验收应包含哪些项目?

答案

参考答案:

本工程安全验收应包括以下内容:沉井模板支撑系统验收、脚手架验收、临时施工用电设施验收、个人防护用品验收、沉井周边及内部防高空坠落系列措施验收、龙门吊安装完毕验收、顶管设备安装完毕验收。

解析:

本小题是道分析简答题,涉及的考点:施工安全验收制度。项目部应依据资源配置计划和风险控制措施,制定对现场人员、实物、资金、管理及其组合的相符性的安全验收制度。

安全验收应分阶段按以下要求实施:

(1)施工作业前,对安全施工作业条件进行验收;

(2)危险性较大的分部分项工程,其重大危险源工程以及设施、设备施工工程中,对可能给下道工序造成影响的节点进行过程验收;

(3)物资、设施、设备和检测器具在投入使用前进行使用验收;

(4)建立必要的安全验收标识,未经安全验收或安全验收不合格不得进入后续工序或投入使用。

本顶管工程的施工作业阶段由以下大的阶段组成:沉井预制及下沉、龙门吊安装就位、顶管设备安装、顶管、拆除顶管设备、砌筑检查井、回填土、工地清场。在沉井预制及下沉阶段需要进行验收的有沉井模板支撑系统验收、脚手架验收、临时施工用电设施验收、个人防护用品验收、沉井周边及内部防高空坠落系列措施验收。龙门吊安装就位后需要实施龙门吊安装完毕验收。顶管设备安装完毕也需要进行安全验收。顶管开始前需进行临时施工用电设施验收、个人防护用品验收、沉井周边及内部防高空坠落系列措施验收。

选择题
阅读理解

Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago. But few people believed him until 1970. In that year a Canadian scientist George Kill proved the English professor was right. Dr Kill filled an open oil pail(桶) with cold water. He filled another with warm water. He put both in the same low temperature. The warm water froze first. The lack of covers on the pails is the secret. Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen. And so the warm water froze faster than the cold water even though it had a greater temperature drop to make.

小题1:Hundreds of years ago, Sir Francis Bacon found _______.

A.the temperature of warm water drops faster than that of cold water

B.warm water is heavier than cold water

C.warm water has the same temperature as cold water

D.warm water is not as useful as cold water小题2:What Sir Francis Bacon said was right, but people didn't believe him until _______.

A.late in the 19th century

B.early in the 20th century

C.three years ago

D.late in the 20th century小题3:Leave a pail with warm water and another pail with cold water in the same low temperature, you’ll find that _______.

A.cold water freezes first

B.warm water turns into ice before cold water

C.warm water and cold water freeze at the same time

D.much of cold water is changed into air.小题4:Why does warm water freeze first in the same freezing weather?

A.Because some of the warm water turns to vapor, the amount(数量) becomes less than that of cold water.

B.Because warm water is lighter than cold water.

C.Because the temperature of warm water is lower than that of cold water.

D.Because cold water freezes with more difficulty than warm water.