Perimeter wall

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Hoopoe
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Perimeter wall

Post by Hoopoe » October 19, 2016, 12:36 pm

Hi Guys ,
looking for info ,thought i'd post on here as where to buy Udon link is prob wrong link to post this on , i have a retaining wall 4 meters tall on one side 2 meters the other side , the bottom half is leaning south ,the top is going north , HA , so iv'e seen post that are piled into the ground ,(depth i dont know, i would presume at least 2 mters ) , then slotted concrete panels inserted between the post , the reason i'm asking is i had the house built on 6 meter piled posts and nothing has ever moved ,i'm wondering where i can get this system , i was told Khon Kaen but have so far failed to find them , cheers in advance



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Re: Perimeter wall

Post by Hoopoe » April 6, 2017, 3:22 am

Hoopoe wrote:Hi Guys ,
looking for info ,thought i'd post on here as where to buy Udon link is prob wrong link to post this on , i have a retaining wall 4 meters tall on one side 2 meters the other side , the bottom half is leaning south ,the top is going north , HA , so iv'e seen post that are piled into the ground ,(depth i dont know, i would presume at least 2 mters ) , then slotted concrete panels inserted between the post , the reason i'm asking is i had the house built on 6 meter piled posts and nothing has ever moved ,i'm wondering where i can get this system , i was told Khon Kaen but have so far failed to find them , cheers in advance
Hy , guys things have got worse since the last posting ( ha ) on this , i've now found a place in Udon that doe's the piled .(not just hole dug and filled with concrete , ) post's the wall is about to collapse , so have got a company called CPU ,to do a land survey etc , they will take down the existing wall , then pile 2-4 meters as the survey revealed different soil conditions , ,work should start early May , time frame of 2 weeks has been estimated to complete the work , will keep you all informed as and when work is carried out ,
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JR
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Re: Perimeter wall

Post by JR » April 13, 2017, 8:49 am

A very typical thai "wall". As you said, here the only thing to do is to take it down and start new and do it right.

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rick
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Re: Perimeter wall

Post by rick » April 13, 2017, 6:57 pm

Retaining walls do come under a lot of pressure. I built one 12" high to hold back soil in a vegetable patch, as so low i skimped on foundations. Result - wet season came and the soil pushed it over at an angle, had to rebuild it. Unless soil is fully stabilised the horizontal forces can be very high.

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panick
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Re: Perimeter wall

Post by panick » April 13, 2017, 7:49 pm

General rule of thumb .......
If the land has been filled over 1 year (settled) You only have to go down (pile) 3m's
Under 1 year (land built up and not settled) 5m's
The problem is we never know the history of the property and as the "Yank's" say ..... "We need Full Disclosure!"
Wifey and I want to upgrade after 12yrs .... Any house/property we look at .... We review on "Google Earth" using the time line ... shows how the land lays! ;-)
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Hoopoe
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Re: Perimeter wall

Post by Hoopoe » April 14, 2017, 6:25 am

rick wrote:Retaining walls do come under a lot of pressure. I built one 12" high to hold back soil in a vegetable patch, as so low i skimped on foundations. Result - wet season came and the soil pushed it over at an angle, had to rebuild it. Unless soil is fully stabilised the horizontal forces can be very high.
Rick , this one is 12ft/4meters high, the retained soil depth is 6ft/2 meters , this has been leaning since day one of in fill, it has got worse over the 10 years , my perimeter wall has 6 sections to it due to gates etc , 2 sections one 4 meters and the other 3 meters high x 20 meters long went over within a month of the back fill ,first rain ,,,,,the soil fill of the land had been through 2 rainy seasons , so no more than a meter and a half was back fill ,,,,,this is a builder who knows how to build perimeter walls (NOT) my concentration was soley fixed on the bungalow ( which has never moved ) ya live and learn , ,,,i now see a lot of the slotted panelled walls now being built ,

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sometimewoodworker
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Re: Perimeter wall

Post by sometimewoodworker » April 14, 2017, 6:49 am

Hoopoe wrote:
rick wrote:Retaining walls do come under a lot of pressure. I built one 12" high to hold back soil in a vegetable patch, as so low i skimped on foundations. Result - wet season came and the soil pushed it over at an angle, had to rebuild it. Unless soil is fully stabilised the horizontal forces can be very high.
Rick , this one is 12ft/4meters high, the retained soil depth is 6ft/2 meters , this has been leaning since day one of in fill, it has got worse over the 10 years , my perimeter wall has 6 sections to it due to gates etc , 2 sections one 4 meters and the other 3 meters high x 20 meters long went over within a month of the back fill ,first rain ,,,,,the soil fill of the land had been through 2 rainy seasons , so no more than a meter and a half was back fill ,,,,,this is a builder who knows how to build perimeter walls (NOT) my concentration was soley fixed on the bungalow ( which has never moved ) ya live and learn , ,,,i now see a lot of the slotted panelled walls now being built ,
The slotted panel walls are probably not very good as a retaining wall. You only have a few cm at each end holding the panels and of course the fill. If you try to use the concrete planks used for floors they don't have the strength to resist breaking, as they are designed to have a concrete skin added. The other panels are OK as a wall if you don't mind chipped edges (they are a little fragile) or are prepared to reject any that are damaged.
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Re: Perimeter wall

Post by Marcosteffano » April 14, 2017, 8:13 am

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.....as a retired bricklayer and civil engineer for the railway in the uk I have a fair knowledge about retaining walls.first of all the footing are never dug in deep enough to a lower level in the ground,then the walls are build with a 70mm block that has the density of a weetabix.also people like to grab as much land and build to the very limit of their boundary so this is a problem in it self as the inside land is usually raised a few foot and then a great deal of pressure is placed against the wall...another factor is when the wall is built it never gets the protection of being painted and a coping.so for months it will be light weight and dry,then for months it will be saturated and approximately 4 times heavier and all this will move the whole lot about and eventually break its back...another thing to remember is not to plant up trees next to your lovely new wall as they will help in the wall moving.in general to retain a 3ft or 1 metre raised land you would at least have a 9inch or 225mm thick wall.i think people ask to much of a Thai constructed wall and as you can see all over the country they don't work.remember drainage and backfill with the grey gravel and paint the wall and a good few coats to the top to stop the ingress of water.

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Re: Perimeter wall

Post by Marcosteffano » April 14, 2017, 9:26 am

in fact you can pull down the old wall and use that as part of your back fill and save on so much gravel.the object being it drains the water away from the inside instead of trying to use 70mm blocks as a swimming pool wall.im having the same problem with a property and I'm removing trees from inside my boundary,I've fully painted it and I'm in the middle of negotiations with the farmer of raising the land outside a couple of feet 2 metres out and asking if she would like some nice lime trees planting along the raised compacted soil im giving her.20,000b would do it but it'll save me a lot more time and money than letting it go too far over and the headache that would come with it.remember prevention is better than a cure.

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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 9:54 am

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Prepping a 100m x 0.6 to 2.4mt high, retaining wall, Bored piers set at 1.2 m apart 450mm dia pier, minimum depth of pier is height above natural ground +200mm, so a 2.4m high wall will have a bored pier of 2600 mm deep
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The columns are 102x102x6mm H beam, Hot dipped Gal, here you can see the columns concreted in and first row of concrete sleepers installed, they are lifted in place by excavator with a clamp grab, notice at the bottom of the wall steel reo N12, tieing all the gal columns together, called a pile cap, the footing is 1200 wide. to soil will be filled to top of the steel gal columns, then fence installed on top of that
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Concrete pile capping pour locking all the columns together at natural ground level, this will be covered over with spoil
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 10:04 am

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Installing Gal H columns
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backfilling with drainage gravel 10mm, as we build up the sleeper wall, notice the geotectile fabric behind the gravel on the back fill side, the fabric is laid over the gravel and retaining wall, red soil is then rolled compacted with sheep foot roller, then the fabric is folded back over the soil and more gravel is added, then fabric is folded over the gravel again, and more soil added compacted built up.


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Angle brackets for fence to attach to
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 10:16 am

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8T and 0.5 t vibrating sheep foot roller
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Finished wall with gravel and geotectile fabric then red top soil backfill
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 10:19 am

These designed walls meets Australian building code for minimum life of 50 years, so there is no cheap charlie short cut, the local Udon walls are just rubbish, pay for quality and get life long duarability
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 10:36 am

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2400 mm below ground footing and slab for retaining wall,
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Reo steel going in place, the horizontal footing in a retaining wall is called the toe, it stabilises the wall, the boundary wall 1 has reo at 400mm centers, the other side wall 2 as it will be near a building has the reo at 200 mm centers every block core, blocks are 200x200x400 mm
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Dont forget the Ag pipe at the bottom of all retaining walls, the flex pipe has slots to allow the water to drain away the geofabric is placed over the pipe then the gravel placed on top of that, the Ag pipe drains into

stormwater
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50mm pvc pipe runs through the wall to help drain behind the wall
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 10:42 am

Final produce notice right side has reo at 200mm centers, core filled blocks, the age pipes at the bottom help filter the water, this pit is used for stormwater over flow, but the retainwall is designed for both sides pressure from soil and water
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 12:00 pm

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1m x 300 mm footing called the Toe, for fence block wall
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12mm reo at 400mm centers
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Pumping standard fence wall footing with reo cage in place, bores piers 1800mm deep were installed at 2m centers
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10mm heilix with 150 dia at 200mm spiral 4 x 12mm reo bar vertical, used when NO steel post is inserted into pier hole, stops wall from over turning, when you need to go higher, similar to using a wide toe footing design, in this case we have a 405x450mm footing with bored piers, as we could not install a wide toe footing
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 12:02 pm

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Block work sitting on 450 x450 footing with bored pier design, core fill blocks with reo every second core
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 12:09 pm

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Not a good close up, but excavator installing concrete sleepers


bobcat installing concrete whalers with grabber
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Re: Perimeter wall

Post by AussieBoy » April 14, 2017, 12:20 pm

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typical design for block retaining wall, section B length is blank, the toe, you look up a chart as to how high the wall is going, lets say 2400mm high, then look for B width, the higher the wall the wider B will be, the thickening width 300mm is used when a load will be applied to the end of the toe, drive way building ETC

Notice the vertical reo is places at the right side off centre, telling me the load is being applied to the right side of the wall pushing to the left, get the placement of reo in correct position, if the vertical reo was placed to the left side off center the wall, the strength of the bending moment of the wall would be decreased

N12 is deformed 12mm 550 Mpa steel / reo mesh is F82= 8mm thick steel at 200 centere both directions/ -400 means 400mm centers either vertical or horizontal as maybe be drawn
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