Balochistan HUB Bridge about to fall! NHA doesn't want to fix - travel at own Risk! CORRUPTION.

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[Bilal9]

AFAIK - the piers underneath the pillars have not moved. 'Tut chukey hain' is not correct. The caisson around the piers need to be reconstructed and reinforced though, which is an urgent requirement before floodwaters erode the pillars holding up the bridge beams.

 

[valkyr_96]

When the bridge is build over a river-bed the columns normally run very deep into the sand. The issue is that around the pile cap an additional concrete layer has been added for no apparent reason, furthermore it is layered as a box while pile caps in rivers are curved shaped -almost like a boat to avoid wear and tear. It is this layer that has cracked and exposed not the pile cap. You can clearly see the two different things in the video.

Additionally, the pile cap is higher the river-bed this suggest that the bed has been dredged for sand to be used in construction.

Some pics for reference, I couldn't upload them for some reason:

Попередження про переадресування

Попередження про переадресування

 

[valkyr_96]

AFAIK - the piers underneath the pillars have not moved. 'Tut chukey hain' is not correct. The caisson around the piers need to be reconstructed and reinforced though, which is an urgent requirement before floodwaters erode the pillars holding up the bridge beams.

It is not a caisson but thanks for the informed reply on the matter.

 

[Bilal9]

It is not a caisson but thanks for the informed reply on the matter.

You are right. I am no civil engineer so mixed up the names. Underneath the pier columns are the pile caps ( and pile footers cast in-situ around the pile caps which are damaged) and below the pile footers are the piles. The piles seem to be intact however the pile footers underneath the pier columns are broken as shown.

 

[Bilal9]

When the bridge is build over a river-bed the columns normally run very deep into the sand. The issue is that around the pile cap an additional concrete layer has been added for no apparent reason, furthermore it is layered as a box while pile caps in rivers are curved shaped -almost like a boat to avoid wear and tear. It is this layer that has cracked and exposed not the pile cap. You can clearly see the two different things in the video.

Additionally, the pile cap is higher the river-bed this suggest that the bed has been dredged for sand to be used in construction.

Some pics for reference, I couldn't upload them for some reason:

Попередження про переадресування

Попередження про переадресування

How about that? Great minds think alike! I posted the same image.

My suspicion is that the pile cap surrounding structure was simply cast in-situ without any re-bar (tor steel) reinforcement and not enough cement. Over time, the force of on-rushing flood water (and the shape of the pile cap surround being square) caused this damage.

In any case, to correct this situation, some shallow piles need to be sunk around the pile cap casement and should be (like you said) shaped like a boat to prevent further erosion.

Talking about piling, during the Padma Bridge Piling in Bangladesh, they used some pretty large piling hammers by Menck Germany. These were so large, they had to be custom-made.

This article has the details,

STRUCTURE magazine | Padma Bridge

www.structuremag.org

 

[valkyr_96]

How about that? Great minds think alike! I posted the same image.

My suspicion is that the pile cap surrounding structure was simply cast in-situ without any re-bar (tor steel) reinforcement and not enough cement. Over time, the force of on-rushing flood water (and the shape of the pile cap surround being square) caused this damage.

In any case, to correct this situation, some shallow piles need to be sunk around the pile cap casement and should be (like you said) shaped like a boat to prevent further erosion.

Talking about piling, during the Padma Bridge Piling in Bangladesh, they used some pretty large piling hammers by Menck Germany. These were so large, they had to be custom-made.

This article has the details,

STRUCTURE magazine | Padma Bridge

www.structuremag.org

I am sorry for the extremely late reply....I normally do no linger around conversations for too long. Thank you for the video. As far as Hub bridge case was concerned there was no issue. I had referred this matter to my father who specialisation has been Roads, Pavements and Bridge design (including drainage and now Transportation).

My father has been associated with numerous roads and bridge projects which include numerous landmarks in Karachi, work on roads and pavements of Jinnah and Allama Iqbal international airports. I have a lot of anecdotes, for example he designed the first underpass (KPT) in Karachi. So when it rained the flyover was flooded -you will still find pictures of the incident. We made a lot of fun as Dawn had carried a big front picture on its newspaper. It was not a design fault but a failure of civic services. There were three pumps: two main and one backup. Only 1 pump worked. No maintenance had been done (We always have unexpected rains with long dry spells). He went on to design two more underpasses in Karachi.

When he was designing the KPT interchange, he watched me play NFS Underground 2 and told me that he was designing a similar to the interchanges that made up the tracks. I did a few run-arounds for him. He made 7 proposals for the project. In response to some comment (praise on the project) on LinkedIn (unfortunately I can't find an option to search this comment) he simply respond that he did not consider the project to be success because the best proposal was not chosen in which he had separated heavy traffic (due to the port) from the city traffic through separate tracks. Anyone who has travelled around it knows how much it sucks to be stuck behind a slow moving giant truck. There has been an incident that the truck over-turned killing some people.

You can spot the interchange on this flight simulator run at 7:30 mark:

My father also had run-ins with Mr. Cowasjee. He had written in the newspaper and my father was summoned to court. The case was that where a bridge lands require you to solicit approvals from people who might be affected by it. Initially, the plan was near a mosque. The Imam of this mosque (Saudi funded) stated that he would drop bodies (bloodshed) if such a thing happened so they had to move the landing forward. The woman on whose house the landing was decided lived in America so she did not reply to multiple letters but once the construction started she came back and started protesting that her rights had been infringed which prompted Cowasjee to pick the case. We both have a lot of respect for him regardless.

On matters of the recent DHA flooding, my father had present a comprehensive plan to manage the drainage issue which has persisted there for a long time. But they were looking for a quicker fix to the issue. As a result the issue still persists and will further deteriorate as sea levels rise.

Sorry for the rambling. It has been a pleasure conversing with you. Allah hafiz.

 

[Bilal9]

I am sorry for the extremely late reply....I normally do no linger around conversations for too long. Thank you for the video. As far as Hub bridge case was concerned there was no issue. I had referred this matter to my father who specialisation has been Roads, Pavements and Bridge design (including drainage and now Transportation).

My father has been associated with numerous roads and bridge projects which include numerous landmarks in Karachi, work on roads and pavements of Jinnah and Allama Iqbal international airports. I have a lot of anecdotes, for example he designed the first underpass (KPT) in Karachi. So when it rained the flyover was flooded -you will still find pictures of the incident. We made a lot of fun as Dawn had carried a big front picture on its newspaper. It was not a design fault but a failure of civic services. There were three pumps: two main and one backup. Only 1 pump worked. No maintenance had been done (We always have unexpected rains with long dry spells). He went on to design two more underpasses in Karachi.

When he was designing the KPT interchange, he watched me play NFS Underground 2 and told me that he was designing a similar to the interchanges that made up the tracks. I did a few run-arounds for him. He made 7 proposals for the project. In response to some comment (praise on the project) on LinkedIn (unfortunately I can't find an option to search this comment) he simply respond that he did not consider the project to be success because the best proposal was not chosen in which he had separated heavy traffic (due to the port) from the city traffic through separate tracks. Anyone who has travelled around it knows how much it sucks to be stuck behind a slow moving giant truck. There has been an incident that the truck over-turned killing some people.

You can spot the interchange on this flight simulator run at 7:30 mark:

My father also had run-ins with Mr. Cowasjee. He had written in the newspaper and my father was summoned to court. The case was that where a bridge lands require you to solicit approvals from people who might be affected by it. Initially, the plan was near a mosque. The Imam of this mosque (Saudi funded) stated that he would drop bodies (bloodshed) if such a thing happened so they had to move the landing forward. The woman on whose house the landing was decided lived in America so she did not reply to multiple letters but once the construction started she came back and started protesting that her rights had been infringed which prompted Cowasjee to pick the case. We both have a lot of respect for him regardless.

On matters of the recent DHA flooding, my father had present a comprehensive plan to manage the drainage issue which has persisted there for a long time. But they were looking for a quicker fix to the issue. As a result the issue still persists and will further deteriorate as sea levels rise.

Sorry for the rambling. It has been a pleasure conversing with you. Allah hafiz.

Many Thanks brother for the detailed reply. I appreciate the explanation and links.

Glad to learn something about civil engineering (in Karachi), a subject I'm always interested in.

In Bangladesh we have soft ground issues, being that most of the alluvial soil deposits are relatively new (in time constants) and so deep piling have to ensue for buildings of any height. Bedrock is hundreds of meters deep. This is the reason most apt. blocks in Dhaka don't exceed twenty or so stories, piling cost is prohibitive. Embankments are another reason setting up railway rights of way is also expensive.

Recently they have started plans for a complex of three large towers of 111, 71 and 57 stories in Dhaka, Allah knows how deep we have to pile for those and if these will even get completed. World's largest custom made piling hammer (Menck Germany) exists locally for this reason, among others.