Core Drill Handrail/Chain Link Fence on Modular Blocks
Core Drill Handrail/Chain Link Fence on Modular Blocks
(OP)
I have couple of issues to get some better suggestions
A)wrt to specifying core drilling of handrail/chainlink fence on top modular blocks of Segmental Retaining Walls i have got quite a few complains from the site that the blocks seems to crack i looking for suggestion what is the best method to use for coredrilling of handrails and how much deep it should go typically i specify 450mm deep coredrill with non shrink grout and put a geogrid about 4.0ft long (in between top 3 units) just to compensate for 50lb/ft linear load as per our codes.
B) Is there any way to check where we should put filter fabric behind the wall to seperate infill soil and retained soil zones.
A)wrt to specifying core drilling of handrail/chainlink fence on top modular blocks of Segmental Retaining Walls i have got quite a few complains from the site that the blocks seems to crack i looking for suggestion what is the best method to use for coredrilling of handrails and how much deep it should go typically i specify 450mm deep coredrill with non shrink grout and put a geogrid about 4.0ft long (in between top 3 units) just to compensate for 50lb/ft linear load as per our codes.
B) Is there any way to check where we should put filter fabric behind the wall to seperate infill soil and retained soil zones.





RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
Have you considered placing the posts immediately behind the block, which are really a facing unit on the block/soil mass? I have seen this application often, but was usually on walls in the 15 to 30 foot high range.
If the units used are one of the national systems (Allan Block, Anchor Wall Systems, Keystone or Verslok), their staff engineers may be able to provide details based on their domestic and international experience through the years. Each type of unit is different, but many of the design concepts are the same. I have seen details on their sites for similar applications.
Your application is also similar to a common situation on lower walls near and around swimming pools and some highway/municipal applications.
Dick
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
The block are dry stacked, relying on the weight and usually a lip for stability and shear resistance.
Applying a moment(lever arm x 50#) by attaching a post results in a very unstable situation. To resist the lateral load on a railing you need depth into the soil.
Dick
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
Also, i am looking for some good guideline wrt to when to use filter fabric and when not to use filter fabric to seperate the well graded granular (infill zone) with retained zone.
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
h
haven't used it yet, but considering it.
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
You will have to go quite deep to develop enough moment capacity in the top portion of a dry stacked wall. - That is why posts are usually put in the backfill behind the wall and not into the "veneer" that protects the front and ties the grid in place.
The effectiveness of any grout in the lower units would be questionable.
Dick
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks
RE: Core Drill Handrail/Chain Link Fence on Modular Blocks