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Post by dazbt on Apr 15, 2014 12:44:15 GMT -5
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Post by Minutor on Apr 15, 2014 14:27:12 GMT -5
The Austar Mine uses a longwall top-coal caving method, I always understood this to be a bit tricky if the coal doesn't part from the roof
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Post by John on Apr 15, 2014 16:13:34 GMT -5
The Austar Mine uses a longwall top-coal caving method, I always understood this to be a bit tricky if the coal doesn't part from the roof
I remember a bad M/G fall we had at Angus Place, caused a lot of damage, but nobody was injured or trapped by it.
But the one in question was operating very successfully from what the member posted, sadly though, accidents will happen in mining, something we all had to live with. |
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Post by John on Apr 15, 2014 16:17:15 GMT -5
Here's the board devoted to top cave in method.LWTC method
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Post by dazbt on Apr 15, 2014 17:12:53 GMT -5
Apart from the improved quality of equipment there's nowt new about the concept of top coal caving, the French were using the same principle some 50 years ago. One development that I have heard mention of is a variant that allows the caved coal to be directed from behind the roof support onto the forward AFC, not sure if this is successful or even if it has been applied though.
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Post by tygwyn on Apr 15, 2014 17:46:53 GMT -5
That seems to be the system her Daz from the link above by John,heavy scraper chain conveyor behind the shields,or would the both,front and back conveyors go out separately to the main belt?
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Post by tygwyn on Apr 16, 2014 4:30:32 GMT -5
Sadly both are dead.
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Post by John on Apr 16, 2014 6:11:04 GMT -5
That seems to be the system her Daz from the link above by John,heavy scraper chain conveyor behind the shields,or would the both,front and back conveyors go out separately to the main belt?
Nights they used to remove a section of belt to allow production shifts just to remove belt structure, the excess belt is taken up by the automatic belt tension unit..Sounds complicated if you've never seen it done, but very simple in practice.
I may have a photo I took looking up the main gate showing the stage loader, I'll check, if I have I'll post it.
Sorry to hear another two have died...
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Post by dazbt on Apr 17, 2014 3:17:34 GMT -5
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Post by John on Apr 20, 2014 10:54:04 GMT -5
I haven't found the photo of a main gate looking towards the face yet, looks like a photo I haven't scanned yet.
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Post by John on Apr 21, 2014 15:13:14 GMT -5
Found it, this is LW7 M/G looking towards the face, the beam stage loader can be seen on the right, the long object down the centre of the gate carries the cables and hydraulic hoses to the face. The props down the centre of the road have been removed. This was normal and of no danger.
All support is from the pillars with additional support from roof bolts and "W" straps, as per the Managers support rules.
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Post by tygwyn on Apr 21, 2014 16:46:08 GMT -5
Shine your lamp towards the face John,mine`s on the blink,lol.
When you mention the post`s down the middle of the road have been removed,and its quite normal as support is from the pillar`s and bolt`s,as manager`s support rules,
Why were they put up in the first place,presume manager`s support rules?
That`s a dirty roadway with the spill off the pillar.
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Post by John on Apr 21, 2014 17:01:12 GMT -5
Shine your lamp towards the face John,mine`s on the blink,lol. When you mention the post`s down the middle of the road have been removed,and its quite normal as support is from the pillar`s and bolt`s,as manager`s support rules, Why were they put up in the first place,presume manager`s support rules? That`s a dirty roadway with the spill off the pillar.
To be honest, I don't think any of the props carried any weight, lids and wedges never seemed to get crushed.
The mess from the pillars is caused by the weight being thrown forward as the face retreats outbye. Just a bit of crush on the pillars that was of no danger.
When I was at Wongawilli Colliery on the south coast of NSW, Managers rules required props either side of the road and struts from the props to the ribs to prevent "spalling" which was bad in the Wongawilli seam. We didn't have those problems in the Lithgow seam at Angus Place. What you see there is just pressure coming on as the face retreats..Further outbye the ribs held up pretty good. |
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