Hanno Labuschagne

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Joburg CBD explosion caused by methane gas

An investigation has found that methane gas was the cause of the deadly Lillian Ngoyi Street (formerly known as Bree Street) explosion that rocked the Johannesburg city centre last month.

This was revealed by City of Johannesburg City Manager, Floyd Brink, during a media briefing on Wednesday.

[SANews]
 
“It travelled up all along the service tunnel from an unknown source to the crest of the tunnel near the Von Brandis Street.”
That's not encouraging. Where did the gas then go? If there was that much from there should still be plenty hanging around.
 
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Joburg CBD explosion caused by methane gas

An investigation has found that methane gas was the cause of the deadly Lillian Ngoyi Street (formerly known as Bree Street) explosion that rocked the Johannesburg city centre last month.

This was revealed by City of Johannesburg City Manager, Floyd Brink, during a media briefing on Wednesday.

[SANews]
We called it more than a week ago.

I'll send an invoice
 
That's not encouraging. Where did the gas then go? If there was that much from there should still be plenty hanging around.
Where did the gas go ? It dissipated into the atmosphere.
Or do you mean the source of the gas ?

In those drone videos they said that they were still detecting gas days after the explosion. It could have been a slow leak.
Where is the source ?
This is still unknown but I still think that one of the earthquakes ruptured a pocket of gas and it leaked into the tunnel under the road.
That pocket could have either been natural gas or sewer gas.
 
It’s high traffic.
Being basically a new build it will apparently 20 million per kilometer.


Yeah very much high traffic...

So lets assume we're talking 1.5kms of road that needs to be rebuilt, you're at R30m.

All the underlying infrastructure for 1.5km (new tunnel, rerouting and rebuilding services), say another R30m.

An additional portion for contingencies of say R15m.

Not that we wonder, but what is the other R100m for?

Even if we go over the top and tack on R20m for removal of the existing rubble and debris, there is still R80m that is possibly not really that well accounted for
 
Yeah very much high traffic...

So lets assume we're talking 1.5kms of road that needs to be rebuilt, you're at R30m.

All the underlying infrastructure for 1.5km (new tunnel, rerouting and rebuilding services), say another R30m.

An additional portion for contingencies of say R15m.

Not that we wonder, but what is the other R100m for?

Even if we go over the top and tack on R20m for removal of the existing rubble and debris, there is still R80m that is possibly not really that well accounted for
Project management.
 
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Project management.

Quite likely.

I suppose more of what I'm getting at, is that our government loves to throw around numbers, but there is no breakdown of what the actual costs are for the bits and pieces of the work.
Its something I've been challenging eThekwini on recently when they throw around numbers and its both distressing and fsck off funny to watch senior management fumble around when they can't provide answers.
 
R178million is much less than we initially thought, but still R250million is a fair amount of money to spend on fixing the damage. not sure if the city has the R400million needed to fix this, but they'll just have to find that somewhere in the budget. i suppose we should be glad that this didn't happen under one of the many highways or large streets, otherwise we'd be looking at a bill of more than the R800million needed to fix bree street. hopefully the cost doesn't go up more than the R1.2billion in their initial estimates.
 
So nothing has been done regarding the other tunnels that could experience the same problem?
 
How much will it cost? R178Million.
Ok
1 Million for you, 1Million for you, 1 Million for you.
But how much will it cost to fix the road?
'What road?'
Probably end up costing a half a Billion and still have nothing to show for it. Then request bailout from Tax payers and support to come fix the road.
 
Yeah very much high traffic...

So lets assume we're talking 1.5kms of road that needs to be rebuilt, you're at R30m.

All the underlying infrastructure for 1.5km (new tunnel, rerouting and rebuilding services), say another R30m.

An additional portion for contingencies of say R15m.

Not that we wonder, but what is the other R100m for?

Even if we go over the top and tack on R20m for removal of the existing rubble and debris, there is still R80m that is possibly not really that well accounted for
Its padding for when they discover what the real problem is
 
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