in recent years, around the subway construction under the background of high-speed growth

Summary: in recent years, around the subway construction under the background of high-speed growth, the subway construction accidents are increasing, the cause of the accident, the most landslides is appeared in the process of the construction site, Shanghai, Beijing, xian, hangzhou and other places have happened this kind of accident. Steel Structure Warehouse, lower cost,managementIs not caused by the subwayThe constructionThe main reason of the accident. Wang ever processing of hangzhou subway accident, his reason for subway accident took four conclusion: unreasonable unreasonable schedule, reasonable cost, unreasonable contract, reasonable solutions.

Killed 5 people of xi 'an third line collapse accident, safety issues for the construction of the subway back on to the people's horizons.

Official identified as the cause of the accident was in xian & other; Shield tunnel structure instability throughout the &; , let the claim many times to participate in xi 'an subway demonstration project of Chinese academy of engineering academician wang felt a little confused.

On May 7, he said in an interview, & other; Shield is the most should not be a problem, it is a very mature model, even if a problem also has a set of protection system of shield construction, not easily the dead. Throughout the &; Wang believes that main causes of the subway construction safety accident appear & other; Catch time, price and poor management & throughout; .

For the above statement, the relevant administrative department of the exact word, but it is worth noting that not completely according to the daily economic news "reporterstatisticsAre construction of metro lines, the current national more than 70, a total investment of more than 8000 one hundred million yuan, if plus has been approved by the project, investment of 1.5 trillion yuan of above.

Shield construction generally will not cause casualties

Xi 'an metro line three safety without accidents timing card at the 477th heaven, and stop this number the reason & other; Shield & throughout; The problem.

There are some strange name, but this is one of commonly used method is to build the subway. Shield shield construction is the use of excavators in underground excavation, soft foundation excavation surface to prevent the collapse or maintain stability of excavation face at the same time, the machine safely inside the tunnel excavation and lining operations. Generally speaking, the shield tunnel boring machine cutting soil excavation, transport soil crusts, tunnel lining, measure orientation deviation, and other functions.

Wang are familiar with this kind of machine, he said, this is a cylinder shell that shield components, there are a variety of operating systems, sells more than 4000 4000 yuan, and other Shield technology is very mature, and has a safe mode of operation, not the need of personnel, even happen collapse, shield outside dish support not to live but internal support system, general won't appear in death. Throughout the &;

But in recent years, shield tunnel construction accidents occur frequently. At 5 am on May 6, 2011, tianjin metro line 2 last shield interval had been excavating, sudden accident, resulting in two sinking of shield machine, two-way tunnel scrap, but caused no casualties.

Wang, nanjing subway shield construction method is used to build, repair to the xuanwu period of mechanical annihilation phenomenon also happen, but the shield protection system, so accidents didn't kill anyone, & other; Shield method is to build the subway very safe. Throughout the &;

Based on xi 'an metro construction headquarters, deputy commander in chief Qiao Zheng is introduced, the exact location of the collapse accident is within the range of xi 'an metro line no. 3 DE gruyter temple one of shield starting shaft. On the north side of the shaft has two underground running tunnel, underground running tunnel of the left line to 8 m, its founder constantly in the process of the layered soil, collapse accident occurred.

, according to a railway engineering in the industry of shield construction process need to be at one end of the tunnel for a shaft or pit, hanging into the installation of shield machine, the shield machine starting shaft or hole the wall of the foundation pit excavation, alongdesignHole line forward until she reached another shaft in the hole line or to the end of tunnel. The researchers speculate that may be the problem in shaft.

In addition to shield tunnel structure instability, & other; Rain lead to loose soil & throughout; Has been officially listed as one of the reasons. However, a citizen, told reporters that xi 'an this a few world rain without an umbrella, did not even wet road.

Wang has repeatedly invited to xi 'an subway's argument, he said: & other; Xi 'an itself is the loess, the soil is suitable for building the subway, I don't have to completely when the argument put forward in some places the shield method is adopted, because of shield method is suitable for in humid areas, and xi 'an construction by shield method to add water, if the water is too much loess will form a cohesive soil affect machine operation, can use commonly used in Beijing subway & lsquo; Shallow depth WaFa & rsquo; Throughout the &; .

The accident on shield construction problems, and loss of life, this let wang has some regret, he said & other; Don't know what is the problem & throughout; .

& other; Rob throughout time pressure & cost; The cause or accident

In fact, this is not in xi 'an subway first collapse accident. On August 2, 2009, sprinkle jinqiao station of xi 'an subway construction site collapsed slump have happened accidents, killing 2 homework personnel.

In recent years, in the subway construction under the background of high-speed growth, the subway construction accidents are increasing, the cause of the accident, the most landslides is appeared in the process of the construction site, Shanghai, Beijing, xian, hangzhou and other places have happened this kind of accident.

On December 31, 2012, Shanghai metro line 12 in pudong jinqiao parking lot access library construction collapsed, killing five people. On November 15, 2008, hangzhou customs avenue subway construction site, large area ground subsidence accident killed 21 people.

According to incomplete statistics, at present the country is on the construction of metro lines more than 70, a total investment of more than 8000 one hundred million yuan, if plus has been approved by the project, investment of 1.5 trillion yuan of above. To build metro cities are also growing, wang, new construction is 28 cities last year, behind a batch of the four cities, this move GongJian metro city up to 32.

First planning approval again has become the norm in local subway investment, and even some cities had started too late approval. The accident of xi 'an metro line 3 a project about the alleged & other; Built before shipment & throughout; , the first phase of the line in May 2012 to obtain the approval from the national development and reform commission (NDRC), but a number of projects, including the above bid accident already & other; Construction & throughout; Or & other; Comprehensive construction & throughout; .

Notable is, in the process, the project investment cost is high, the construction cycle is long, weak profitability, and other issues also emerge. Underground of high investment, let the local government is facingfinancingressure, and to build the subway, let local government with greater debt burden. According to metro industry insiders revealed that in the current mode of subway construction, the investment proportion of local government is likely to be accounted for by more than 40%, while the other is by the subway company loans. Under the subway widespread losses, & have sprung up all other In order to to raise iron & throughout; Model, but it's still not enough to solvefinancingThe problem.

& other; Rob period, lower cost, poor management is the main cause of subway construction accident. Throughout the &; Wang ever processing of hangzhou subway accident, his reason for subway accident took four conclusion: unreasonable unreasonable schedule, reasonable cost, unreasonable contract, reasonable solutions.

In addition, different subway lines in the same city, there are multiple units. Such as the construction of the engineering of xi 'an subway accident ZhuZong group in Beijing, and in 2009, construction of the line for the iron 2 bureaus co., LTD., another supervision party supervision company for the Beijing subway.

& other; Some of the construction unit to take the subway is not experienced. Throughout the &; Wang thinks, at present more and more city subways is shenzhen BT construction model, entirely by the big oneConstruction enterpriseTo pay for,standardAnd solutions are completely good, be decided by the company owner party pay,Construction enterpriseBuild the subway to the owner after.

It is understood that the so-called meaning & other BT mode; Construction - transfer & throughout; , is the government using private money for non-business infrastructure projects of a financing mode, refers to the operation of a project by project general contracting company, Steel Structure Warehouse, construction acceptance back to the owner, the owner pay to investors in the project total investment plus a reasonable return process.
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