Geocell Channel for Rainwater Drainage
Let’s check a case study from one of our customers, who want to use Geocell to build rainwater drainage channels:
Good afternoon.
We need to quote geocells for the construction of rainwater drainage channels with concrete.
The height of the geocell must be 75 and/or 100 millimeters, please inform the width and length of the rhombus of the cell, as well as the maximum size of the piece of geocells. Initially we need to quote 200,000 m2.
This is the design of the drainage channels and their dimensions, as you can see it is a significant number of square meters. Please check your prices since the amount originally quoted is above market prices.
Please also provide us with A and B in mm, for 75 mm and 100 mm height. Also please provide N and M in cells and mm.
Question: What is the welding distance?
Dear Sir,
For Geocell welding distance, we can produce from 250mm to 1000mm, but regular types are just 330mm, 356mm, 445mm, 660mm, and 712mm.
330mm and 356mm mainly be used on soil stabilization/ load support projects.
356mm mainly be used on channel protection projects.
445mm mainly be used on slope protection or erosion control projects.
660mm and 712mm mainly be used on retaining wall projects.
But different projects use different Geocell types, for channel protection as in your project, some customers also use Geocell welding 356mm or 445mm. So it is better to confirm the exact specifications you designed, then I can quote the exact and best price to you.
A and B are fixed, when welding distance is fixed, it has nothing to do with the height.
For welding distance 356mm, AxB=260x255mm
For welding distance 445mm, AxB=320x288mm
N and M, no matter in cells or m, both can produce as per your request, if your project need size 5x8m/pc, then we can produce to close this size.
Our regular size is as follows:
For welding distance 356mm, MxN=2.34×7.65m
M=9 cells, N=34 cells
For welding distance 445mm, MxN=2.56×9.8m
M=8 cells, N=34 cells
Can you understand all the above information now?
Thanks for your time.
Dear Claire:
Attached we send the translated document. We need your company’s engineering department to be able to work with these figures to give us a complete quote.
Kind regards,
Dear Gerardo:
I have checked all your documents and figures with our engineer, and we still have several questions want to check with your technical person, which is more helpful to confirm the best suitable Geocell type and quantity, please check as follows:
1. Channels for storm drainage. These are simple mus, and can be from 75 to 100 mm. We need that reviewing the design, and you suggest us, which one to use.
For these channels we need to quote 340,514 M2.
# For storm drainage channels, we need to know:
1, Your subgrade type, which means your channels are newly dug or already existing?
2, The surface run-off velocities, also can called peak flow velocities?
3, Your infill material, will infill concrete or gravel?
These 3 questions are important, please check and advise, then we can recommend and quote the best suitable Geocell type.
Answers from customer:
1, R. Channels are new.
2, R. high speed will be 4,8 meters per second, low speed 2,8 meters per second
3, R. infill Will be concrete H18.
Dear Gerardo,
I checked all your answers and discussed them with our engineer, we have another 3 questions as follows:
You shared your channel’s traditional construction photos with me before,
1, What’s the thickness of your concrete pouring?
2, What is laid under the concrete? Is it fiberglass geogrid composite geotextile? or polyester geogrid composite geotextile?
3, For your new geocell design, will you also lay fiberglass geogrid composite geotextile under the Geocell? Due to your channel is new, so must use Geotextile to prevent the settlement.
Get these 3 answers, then we can confirm the channel Geocell height for 75mm or 100mm.
Answers from customer:
1, 10 centimeters
2, Polyester or fiber geotextile, any of the two. Additionally, it has an 8-millimeter electro-welded iron mesh with a spacing of 15 centimeters.
3, Yes, geotextile will be placed in the sector where the concrete is poured. Additionally, drains are placed on the floor and on the walls, to avoid the pressure of the phreatic level, in the places that are required.
Finally, we recommend Geocell welding 445mm, height 100mm, seam peel strength 10KN/m, GB standard is ok.
As for the detailed size, I organized a file for the customer, if you want to know more details, please contact Claire to get it directly.
