某公司中标一座地铁车站工程,车站基础全长约212m,宽度21m,开挖深度为16m,采

题型:问答题 案例分析题

问题:

某公司中标一座地铁车站工程,车站基础全长约212m,宽度21m,开挖深度为16m,采用明挖法施工。围护结构为地下连续墙,采用锁口管接头;设三道φ609钢管支撑。场地土层自上而下分别为填土、黏土和粉土地层。地下水位于地表下1m左右。基坑北侧有三条需要重点保护的地下管线,其中一条横穿基坑;东侧基坑一倍开挖深度范围内邻近一座条形基础的老旧房屋,开挖时如果变形过大对其结构安全的影响很严重;基坑南侧邻近一条市政道路。

项目部编制了施工组织设计,拟在基坑内侧采用管井降水,降水井按每250m2一口

管井布置。方案中的地下连续墙施工工序为:开挖沟槽→修筑导沟→开挖沟槽(注入泥浆)→清除槽底淤泥和残渣→吊放接头管。项目部编制了基坑监测方案,并且决定自行监测,监测方案由上一级主管部门签字认可后实施。

基坑开挖至粉土时,由于地下连续墙接头夹泥而发生渗漏,项目采取导管引流并且用聚氨酯封堵后没有效果;渗漏渐渐导致水土流失,基坑后土体出现明显沉陷。如果继续发展可能会导致基坑坍塌。

方案中地下连续墙的工序不全,请补充。

考点:市政公用工程(一建)市政公用工程综合练习市政公用工程综合练习题库
题型:问答题 案例分析题

底特律4000系列柴油机的冲程为()。

A、170mm

B、210mm

C、200mm

D、190mm

题型:问答题 案例分析题

链斗挖泥船适于施工的自然环境条件为()。

A.风浪小 

B.施工干扰大 

C.能见度好 

D.水域开阔 

E.流速小

题型:问答题 案例分析题

阅读理解。

     Passport Control

     If you are arriving at London Heathrow Airport and are not transferring (转换) another flight outside

Britain or Northern Ireland, you must pass through Passport Control and Customs (海关) immediately

after leaving your plane. If you are not British or a citizen of the European Community, you must fill out

a special form before your passport is examined. This form is called a landing card and should be given

to you during the flight to London. After landing, follow the ARRIVALS signs. Make sure you are in the

right channel when you reach Passport Control. There is one channel for holders of European Community

passports, and a second channel marked

     "Other Passports".

      Baggage Reclaim (行李领取) Area

     After passing through Passport Control, follow the signs to the Baggage Reclaim Area. If you have

luggage which was carried in the aircraft along with other cargo, it will be delivered to you in the Baggage

Reclaim Area. Look for the sign with your flight number. If you have only hand luggage, go directly through

the Baggage Reclaim Area to Customs.

     Customs

     All passengers must pass through Customs after Passport Control. There is a choice of two channels,

Green and Red. If you have nothing to declare, go through the Green Channel. If you are not sure about

your Duty Free allowances (免税额), or if you have something to declare, go through the Red Channel.

Information about Duty Free allowances can be found on special notice-boards in the Baggage Reclaim

Area. You should study this information carefully whether you are going through the Red Channel or not.

Please note that if you go through the Green Channel, you may be stopped and asked to open you luggage

for inspection.

  

1. When a Chinese traveler is arriving at Heathrow Airport for a trip in London, he must ______.

A. fill out a landing card first

B. pass through Customs before Passport Control

C. walk through the Red Channel

D. immediately reclaim his baggage after landing

2. Those who are not sure about their Duty Free allowances _______.

A. can check the information in the Baggage Reclaim Area

B. need to go through the Green Channel

C. will be asked to open the luggage for inspection

D. can do as those who have nothing to declare

3. Which of the following travelers DO NOT have to go through Passport Control and Customs?

A. People traveling straight to London.

B. Holders of European Community passports.

C. Passengers transferring to a city in Ireland.

D. Passengers only with some hand luggage.

题型:问答题 案例分析题

永暑礁在行政隶属上属于下列哪个城市()

A.海南省三沙市

B.海南省三亚市

C.海南省海口市

D.海南省琼海市

题型:问答题 案例分析题

操作站中图形可显示所有防火区内的探头布置以及探头状态,气体探头显示()-60%LEL报警

A、红色

B、粉红色

C、绿色

D、黄色

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