Shoring for residential infill construction
Shoring for residential infill construction
(OP)
Here's the problem:
Lots of homes in Denver are being scraped and replaced. One time in roughly every 300 homes, the excavation can cause an "issue" on the adjacent property.
So now, the City requires shoring before excavation. The status quo solution has been drilled & reinforced piers, adding $5k to every job. (I'm not against the shoring, safety is always #1)
There isn't enough room between houses for a stepped excavation.
I'm just wondering if anyone knows of a less expensive way to accomplish this?
They used to allow shotcrete to be sprayed on the excavation walls, but stopped that because the "issue" could happen between the excavation and the curing of the shotcrete.
Just brainstorming, if you think of the 40'wide x 60'long x 10' deep excavation as a trench, there are plenty of ways to temporarily shore a trench with reusable equipment.
Lots of homes in Denver are being scraped and replaced. One time in roughly every 300 homes, the excavation can cause an "issue" on the adjacent property.
So now, the City requires shoring before excavation. The status quo solution has been drilled & reinforced piers, adding $5k to every job. (I'm not against the shoring, safety is always #1)
There isn't enough room between houses for a stepped excavation.
I'm just wondering if anyone knows of a less expensive way to accomplish this?
They used to allow shotcrete to be sprayed on the excavation walls, but stopped that because the "issue" could happen between the excavation and the curing of the shotcrete.
Just brainstorming, if you think of the 40'wide x 60'long x 10' deep excavation as a trench, there are plenty of ways to temporarily shore a trench with reusable equipment.





RE: Shoring for residential infill construction
RE: Shoring for residential infill construction
Which way do the tubes lean? toward the basement or away from the basement?
RE: Shoring for residential infill construction
We used precast panels about10' wide and 8 to 12" thick with diagonal shores to a central footing (these will be heavy duty-standard tilt-up shores will not cut it).
We excavated a 10'wide trench to install every 3rd panel, leaving the remaining soil in place. Lean mix concrete was placed in the space behind the panels to endure stiff support of the soil. Eventually you have all your panels installed and you install a conventional slab on formwork between leaving blockouts at the shoring.
RE: Shoring for residential infill construction
RE: Shoring for residential infill construction
It worked, and the existing adjacent building was 1' away.
It was a rendered 2 story solid brick mansion that was falling apart in places.
No problems were encountered, and believe me if any building would have had problems this would have been it.
I agree it does depend on the soil though, this was in clay with a sandstone bedrock only 15' below.
Anyway, how do you underpin - in stages doing almost exactly the same procedure. If the 10' is the issue then use narrower panels in the critical areas.
RE: Shoring for residential infill construction