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Concrete Fencing Posts
tom_boy
#1 Posted : Tuesday, August 04, 2015 11:17:45 AM
Rank: Member


Joined: 2/20/2007
Posts: 707
Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.
KulaRaha
#2 Posted : Tuesday, August 04, 2015 12:00:04 PM
Rank: Elder


Joined: 7/26/2007
Posts: 6,442
Following
Business opportunities are like buses,there's always another one coming
Muheani
#3 Posted : Tuesday, August 04, 2015 12:52:21 PM
Rank: Veteran


Joined: 11/20/2009
Posts: 1,397
tom_boy wrote:
Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.



Tried this sometime back. Did 50 of them using y10. Normal mix.

The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now.

still suspect they are part of a house nearby.....






nakujua
#4 Posted : Tuesday, August 04, 2015 12:59:55 PM
Rank: Elder


Joined: 12/17/2009
Posts: 3,583
Location: Kenya
Muheani wrote:
tom_boy wrote:
Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.



Tried this sometime back. Did 50 of them using y10. Normal mix.

The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now.

still suspect they are part of a house nearby.....

smile at least ulisaidia a neighbor put up a house - lakini why use chuma in the post, if its just for keeping in place barbed wire ama wire mesh, just do them without chuma.
But I am assuming with the molds you have to make the labor and time needed it might just be cheaper to buy the same from the concrete mold guys by the road sides.
KulaRaha
#5 Posted : Tuesday, August 04, 2015 1:56:20 PM
Rank: Elder


Joined: 7/26/2007
Posts: 6,442
Cost difference when using treated wooden poles (the green ones)?
Business opportunities are like buses,there's always another one coming
Much Know
#6 Posted : Tuesday, August 04, 2015 2:14:41 PM
Rank: Elder


Joined: 12/6/2008
Posts: 3,469
If anyone knows about the recycled plastic posts "eco-post" e.t.c, can't find them at hardware stores, what is your experience using them? delivery quantities, durability, cost e.t.c
A New Kenya
tom_boy
#7 Posted : Tuesday, August 04, 2015 9:43:47 PM
Rank: Member


Joined: 2/20/2007
Posts: 707
Muheani wrote:
tom_boy wrote:
Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.



Tried this sometime back. Did 50 of them using y10. Normal mix.

The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now.

still suspect they are part of a house nearby.....







Oh my goodness. I had not thought of people stealing the chumas. I was obsessed with people stealing the wooden posts for firewood. Now what? I guess one has no other option but to use the flimsy plastic ones!
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.
majimaji
#8 Posted : Wednesday, August 05, 2015 8:42:19 AM
Rank: Veteran


Joined: 4/4/2007
Posts: 1,160

even the barbed wire gets stolen
kawi254
#9 Posted : Wednesday, August 05, 2015 9:26:52 AM
Rank: Member


Joined: 2/20/2015
Posts: 328
Location: Nairobi
Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.

The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.

Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.

Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).

So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.

One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.

1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy.
tom_boy
#10 Posted : Wednesday, August 05, 2015 10:12:36 AM
Rank: Member


Joined: 2/20/2007
Posts: 707
kawi254 wrote:
Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.

The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.

Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.

Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).

So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.

One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.

1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy.


Thanks alot. Great info.
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.
nakujua
#11 Posted : Wednesday, August 05, 2015 12:40:05 PM
Rank: Elder


Joined: 12/17/2009
Posts: 3,583
Location: Kenya
unaweza weka bamboo instead of chuma smile saves on the worry of thieves
ole3
#12 Posted : Wednesday, August 05, 2015 12:55:25 PM
Rank: Member


Joined: 1/9/2015
Posts: 188
nakujua wrote:
unaweza weka bamboo instead of chuma smile saves on the worry of thieves



Shame on you Shame on you how safe is the barbed wire after fencing Laughing out loudly Laughing out loudly

shida mara mbili posts Laughing out loudly barbed wire Laughing out loudly

A dream is an illusion worth chasing
Much Know
#13 Posted : Wednesday, August 05, 2015 1:01:52 PM
Rank: Elder


Joined: 12/6/2008
Posts: 3,469
nakujua wrote:
unaweza weka bamboo instead of chuma smile saves on the worry of thieves
Applause I have a kibamboo in shamba, How is it done?
A New Kenya
tom_boy
#14 Posted : Wednesday, August 05, 2015 4:57:15 PM
Rank: Member


Joined: 2/20/2007
Posts: 707
Much Know wrote:
nakujua wrote:
unaweza weka bamboo instead of chuma smile saves on the worry of thieves
Applause I have a kibamboo in shamba, How is it done?


Interesting concept. Do you mean I use bamboo in the concrete post? Is this bamboo supposed to be treated? What kind of bamboo? How thick should it be? Have you done it before?
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.
lenchiiz
#15 Posted : Thursday, July 25, 2019 10:01:31 AM
Rank: Member


Joined: 3/21/2007
Posts: 1
kawi254 wrote:
Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.

The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.

Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.

Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).

So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.

One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.

1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy.


I know I'm light years behind, but might you still have the contacts for these guys? I'm looking for someone who has the skill set in making the concrete poles.
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