lo_pak

To be honest, this bridge should go though a detail review... Hard to believe a 15 years old bridge looks like it's already 60... Obviously it's a construction quality problem because they are supposed to last for a century... Rehabitation should take place as soon as the review is done...

lo_pak

回復 6# rockypath

These are retarded... These activities are minimizing the service life of the road... China should like NA having weighting stations on major routes... These type of transportation violations have created a loss to the general public...

peter236

To be honest, this bridge should go though a detail review... Hard to believe a 15 years old bridge  ...
lo_pak 發表於 2011-7-15 14:04

I don't think there is a quality problem with this bridge. It just was not designed for overloaded trucks.

I heard that heavy trucks is banned on this partcular bridge. But there is no way of enforcing 24/7, especially 3-4 times overloaded trucks are often seen in China.

I think all bridges built pre-2000 should be reviewed and reinforced if needed because:
- pre-2000 they were not using the newer modular bridge design that is used today
- back then the trucks used in China were much lighter
- they could not predict the huge surge in car ownership and traffic load in the last 10 yrs

Lik

I don't think there is a quality problem with this bridge.
peter236 發表於 2011-7-15 15:45

Are you an engineer?

報道指於2006年9月，工程接近尾聲時，一個技術問題專家會得出橋樑「存在嚴重的工程質量問題」的結論。會議記錄稱，大修過程中，下游橋面鋪完水泥後，局部地段出現較多裂縫。專家認為，混凝土砂的比例過高，導致了裂縫產生，並指這是「一個典型的施工質量事故」，要求有關部門進行處理。

I would shut up when I clearly know shxt~

-Lik

peter236

Are you an engineer?


I would shut up when I clearly know shxt~

-Lik
Lik 發表於 2011-7-15 15:52

I also heard that this bridge was renewed in 2005/2006. This resulted in a ban of heavy trucks for this bridge. Clearly, they realized in 2005 that the bridge was not designed for heavy trucks. The question is, why didn't they in 2005, reinforce the bridge so that it can handle 3-4 times overloaded trucks? Like I said, it is hard to enforce 24/7 for overloaded trucks.

The best method is to review and reinforce all bridges built pre-2000.

大修過程中，下游橋面鋪完水泥後，局部地段出現較多裂縫

It looks like they are talking about the road surface here, but not the structure of the bridge.

rockypath

Rockypath, so with your 見識, could you conclude from the wreckage photo that it was a modified rig  ...
B2L2 發表於 2011-7-15 12:01

You can look at it by following this link:  http://tt.mop.com/read_4524896_1_0.html

Do you agree this is a similar type of truck of which reported in the news in the post #1? Even the head lights look identical.

rockypath

回復  rockypath

These are retarded... These activities are minimizing the service life of the road ...
lo_pak 發表於 2011-7-15 14:10

Yes, it is insane.  Not only the problem with overloading but over-high as well.

I saw a truck hit a crossing bridge right in front of me because of its high. I could be a victim if I was 30 feet ahead of where I was because the truck flipped over.

lo_pak

回復 15# peter236

Inspection and monitoring are important... And, to my disappointment, China are doing "shixty" in the inspection section because there are too many corruptions...

2011年07月16日 16:26:07　來源： 新華網

橋梁建設速度太快　設計管護滯後

“最近一二十年，我國迎來橋梁建設高峰期，在很短時間內建設了大量橋梁，目前已有６０多萬座橋梁，在世界上也是‘橋梁大國’。”同濟大學土木工程學院橋梁工程係副主任孫利民教授說，“由于量大集中，後期養護管理跟不上，很容易發生問題。”

孫利民說，一般而言，一般橋梁應該有５０年的使用壽命，部分橋梁設計時甚至達到１００年，但最近出現很多橋梁才使用十多年就壞了，這種狀況讓人擔憂，“尤其是中、小橋梁，質量堪憂。”

專家分析，一些橋梁在設計上不夠規范，在施工質量上沒有保障，造成橋梁先天不足，存在安全隱患；同時，在後期養護管理上，沒有定期檢查、檢測，發現問題也沒有及時解決。

福州大學土木工程學院鄭振教授認為，一些早期的橋梁在規劃、設計上比較滯後，近年來交通運輸發展迅速，大車、重車多，超載現象嚴重，對橋梁破壞比較大，造成橋梁不堪重負，使用壽命縮短，很多早期橋梁的承載能力遠遠不能適應現實的需求。

鄭振介紹，武夷山公館大橋遵循的橋梁設計荷載標準是《汽－２０》，驗算標準是《挂－１００》，也就是說每個車道的主車荷載為２０噸，１００噸以內的車要經過交通部門同意才能通過。“但實際上在橋上行駛的五六十噸的車很多。在交警上班期間，這些大車不敢過，等交警下班後多輛大車同時上橋，對橋梁的損害更大。”鄭振說。

今年６９歲的武夷山三姑鎮公館村村民劉訓祥也告訴記者，這些年武夷山搞開發，運鋼筋、水泥、砂土、石板的貨車特別多，負荷五六十噸的車很多。

“原有的橋梁荷載技術等級偏低，需要提高設計、施工標準，加強工程投資，提高橋梁安全性。”

lo_pak

回復 15# peter236

The whole project is a disaster I can tell from the start to the end... You will be hearing more news from it... Rehabilitation is only good when the project is built to design, it won't work when it's not...

lo_pak

回復  peter236

Inspection and monitoring are important... And, to my disappointment, China are doi ...
lo_pak 發表於 2011-7-16 12:18

I don't actually know how they can setup the standard on a bridge of a major route to 20 tons loading... the officials should be brain dead, the general public will have to pay for it with lives and monies...