Hello po. I will start to build our perimeter fence next month (December 01, 2014). below are details.
Width: 14.3 mts
Length: 47.8 mts
Soil Type: Clay (use to be Farm land)
Backfill: 700-800mm
Column size: (250mm x 150 mm) interval of 3150mm
Footing: 500x500x150mm
Depth from natural grade: 750mm
Materials:
CHB 4"
T10 rebar for column & dowels
T9 rebar for stirrups and horizontal bar.
Height of fence from road level is 6ft, do i need a tie beam? where do I place the tie beam? Your comments & suggestions will be very much appreciated.
Maraming salamat po.
Re: Concrete Fence Project
Not an engineer but I've seen concrete fences higher than 6 feet with no tie beam.
Re: Concrete Fence Project
Allow me to chime in on this bro Michael,
May I suggest using the 5" CHB for your perimeter fence instead of the 4" CHB, madaling umuga at matibag yan. And for your column rebars, do increase the sizes, use 12 mm for dowels and columns. Then 10 mm for stirrups and horizontal bars. These would be the basic or standard size of rebars used for fencing. Mahina pag maliliit ang mga bakal.
You can add beams on top of the last line of CHBs installed connected to the column/posts, this will strengthen your walls.
Hope this helps ! 😉
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Re: Concrete Fence Project
@ fourtheboys96
The tie beam was suggested by my mason, but like you I've seen a lot of fences w/o tie beam. Salamat sa reply.
Re: Concrete Fence Project
@ Rosy,
Salamat po sa tips. Due to limited budget maybe i will use 5"CHB until the backfill level. Tapos sa taas 4"CHB na lang po.
Yes, on top of the last blocks I will finish it with 100mm Lintel beam.
Re: Concrete Fence Project
Im also not an engineer and just finished a concrete fence 5 years ago. My columns are 20x20cm, footing is 60x60. I used 4CHB, same rebars as you did. My property is sloping and some section have as high as 8-10ft. No beams (middle or top). Soil is lime though so very hard.
I think your main concern is water pushing against the walls so that 5" (I use 6" in mine) is a good idea. I also used no12 rebars for the 6 portion.
So far, so good, no movement yet. 🙂
Re: Concrete Fence Project
Yes, I'm worried of the outward force of the soil backfill (tambak) as well as the water inrush during rainy season. Thanks for your construction experience.
Re: Concrete Fence Project
Here's my Project Cost Estimate
(Project site Pampanga)
ESTIMATED PROJECT COST
A. Bill of Materials
Item No. Description Brand Unit Quantity Unit Cost Total Cost
1 Cement Bag 211 PHP 205.00 PHP 43,255.00
2 Sand Truckload 3 PHP 2,800.00 PHP 8,400.00
3 Gravel Truckload 1 PHP 12,000.00 PHP 12,000.00
4 CHB 5" pc 1225 PHP 7.00 PHP 8,575.00
5 CHB 4" pc 2620 PHP 5.90 PHP 15,458.00
6 T12 Re-bar pc 84 PHP 150.00 PHP 12,600.00
7 T10 Re-bar pc 142 PHP 110.00 PHP 15,620.00
8 T9 Re-bar pc 44 PHP 60.00 PHP 2,640.00
9 1/4 " Marine Plywood pc 6 PHP 360.00 PHP 2,160.00
10 2"x2"X10' Good Lumberpc 40 PHP 120.00 PHP 4,800.00
11 2"x2"X10' Coco Lumberpc 40 PHP 57.00 PHP 2,280.00
12 1" Common Nail Kilo 4 PHP 60.00 PHP 240.00
13 2" Common Nail Kilo 4 PHP 55.00 PHP 220.00
14 3" Common Nail Kilo 6 PHP 50.00 PHP 300.00
15 #18 G.I. Tie Wire Kilo 8 PHP 65.00 PHP 520.00
16 #16 G.I. Tie Wire Kilo 4 PHP 60.00 PHP 240.00
Sub-Total PHP 129,308.00
B. Labor Cost
S/n Manpower No. Working days Man-Day Rate/Man-Day Total Cost
1 Mason 2 18 36 PHP 500.00 PHP 18,000.00
2 labor 2 18 36 PHP 350.00 PHP 12,600.00
3 Helper 2 18 36 PHP 300.00 PHP 10,800.00
Re: Concrete Fence Project
Here is my Project Cost Estimate, the project site located @ pampanga.
