Wall for impact of Dozers 2

[SKJ25POL]

Anybody knows this block manufacturer?
These are 2ft x 2ft x 6ft.
Trying to find an economical solution to keep them from rolling out.
Dozers pushed the material against the back wall- Anybody ran to this situation in past?
Any solutions?

Designing walls for Dozers impact- any information

Thank you

 

[manstrom]

Those are "mafia blocks". They are pretty much scrap concrete.

I can't imagine a cheap way of keeping a bulldozer from doing something that it's not supposed to do. Sober them up maybe? Tell the drivers to park their trucks on the other side of the wall?

The steel kickers aren't a terrible idea, but that will add up.



When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

-R. Buckminster Fuller

 

[btrueblood]

Dozers or front end loaders? (It looks like a roadway sand/salt bunker, to fill sand trucks from?)

Blocks like that are common, but typically of a design unique to local concrete companies. Excess concrete in a batch gets dumped into the molds, and the blocks are sold to contractors and state DOT's. Alternatively, they are made to order by the concrete company for large projects.

A better design for a loader bunker is either a) no end wall (let the loader approach from either end to scoop up a load) or b) pour a sloped/tapered end wall for the loader bucket to scrape up against. Expect wear damage for the latter, but I've seen these last quite awhile.

 

[Compositepro]

Actually, to me it looks like the wall is being undermined by water washing sand out from under it. Note the block in the lower corner toward the camera. It is leaning out while the block above it is trying to hold it in place. Also the sand at the base of the wall has obviously recently had water running over it. There is a river in the background.

 

[msquared48]

Place claymore mines on the sidewalls to detonate whenever the end wall is impacted to punish (and eliminate) the evildoers.

Mike McCann, PE, SE (WA)

 

[3DDave]

Go with a suggestion I heard in the mining industry - if it fails, double it. Go to 4 X 4 X 12 foot blocks. It doesn't take long before it no longer fails and saves on analysis cost.

 

[dhengr]

SKJ25POL:
I suppose this is a slightly passive aggressive suggestion, but here goes... Measure the distance from the front of the blade or bucket to the back of the operators seat and add 10-15', this is the harpoon handle length. Locate the harpoons horizontally every 3-4' apart all long the back wall and sticking into the bldg. Place them vertically at about the top height of the back of the operators seat. The material should flow freely btwn. the harpoons, sharpen harpoons, and let er rip.

 

[Signious]

When this runs its course, just print off this thread and post it in the cab of all of the loaders.

Caption it with, 'I asked around to some of the engineers, and we all agreed that you not being idiots is the best solution'

 

[oldestguy]

These concrete blocks made from excess concrete in the trucks and are cheap. I'd re-build the wall with the short (end) dimension facing the storage pile for the lowest course. Next layer with long dimension facing he sand storage and short for next then long, etc.. To add more strength, bed each course of blocks and side joints with a grout.

 

[Archie264]

dhengr,

I suppose this is a slightly passive aggressive suggestion, but here goes... Measure the distance from the front of the blade or bucket to the back of the operators seat and add 10-15', this is the harpoon handle length. Locate the harpoons horizontally every 3-4' apart all long the back wall and sticking into the bldg. Place them vertically at about the top height of the back of the operators seat. The material should flow freely btwn. the harpoons, sharpen harpoons, and let er rip.

3DDave,

Thanks for my new design philosophy. A few of iterations of doubling the prior failure ought to get me there, as you say. 'Shame for the folks on the first couple of rounds, of course...

 

[manstrom]

It must be friday.



When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

-R. Buckminster Fuller

 

[SKJ25POL]

dhengr (Structural)
I am sorry I am not following the harpoon method.
What is a harpoon? You put them horizontally and vertically ?

Could you possibly attach is sketch? It sounds an option but I dont whats a harpoon? and not clear of the locations u mentined
Thank you.

oldestguy (Geotechnical,
Thank you for you reply.
A question, if I lay the first layer short face perpendicular to wall and then next layer parallel to wall then the third layer will be perpendicular to wall and cantilevering? Can 4 feet of block cantilever?

A stetch meay help. Thank you

 

[oldestguy]

I'd not cantilever any of the courses. Note the indents and small peaks that fit together. Use that system with that joint between each block, a vertical joint. just imagine each course (layer) is a wall laid on its side. Looking down these block courses are first oriented "top" to "bottom" , which would be standing on their ends before it was laid down,and the next course has blocks as one would have them in a wall (as done on this job). Subsequent courses just orient them 90 degrees to the lower course.

This is figuring only one wall gets the pressure, Wall B

 

[oldestguy]

Here is the second layer. Just alternate the orientation of the blocks with successive layers. This is a gravity wall so its height would be limited without making sides A and B wider, front to back.

 

[racookpe1978]

The recommended "harpoon" method is viable. But a harpoon is not right instrument. A harpoon is intended to penetrate, then has a reverse point on the barb ro hang on within the flesh. The proper point is a sharp point that will penetrate, then allow simple removal for subsequent application of a band-aid.

One mounts "pikes" (medieval long sticks with a spear-point on the receiving end horizontally on the wall. Each point shall be the length from the wall to midpoint of the longest bulldozer seat from the bulldozer blade, sufficiently high to allow clearance for the bulldozer blade and engine.

Intent is to prevent impact of the bulldozer blade to the wall by allowing the bulldozer operator a clearly visible "warning point" as the bulldozer approached the wall so that the bulldozer operator stops the bulldozer before hitting the wall.

 

[cvg]

an electric fence would be a good alternative to the harpoons

 

[Signious]

I like the pike idea, but it doesn't account for a large amount of material in the storage pile.

If the pile has been freshly stocked the front end loader will not reach pike-engagement range before the material itself is pushed against the rear wall causing further damage. I propose a spring-actuated pike tied to a pressure sensitive plate on the rear wall.

This will also have the added benefit of a 'warning' system letting the operators know of their impending impalement as the pike inches its way towards them.