In many areas of Puget Sound creating retaining structures requires the use of Tieback Anchors to add strength to Soldier Pile or Concrete retaining walls. In most of the Puget Sound Basin the hard subsurface material into which the Tiebacks are to be established is either medium to dense sand or a hard blue-gray clay called Lawton Clay. Helical Tieback Anchors can be used effectively in these materials.
There are, however, several areas where the fine silts from underneath the glacier were compacted into a very dense rock like material called Glacial Till. In areas where there is rock or Glacial Till, the Helical Anchors will not work and in those areas we use an Anchor which has a rock bit followed by a hollow steel tube where grout is injected. These Anchors are called Injection Boring Anchors. There are many machines for installing this type of Anchor. As with the Helical Anchors, Integral Construction has tried to specialize in providing our services where there is difficult access for standard equipment.
. We use a portable air driven Jack Leg Drill to install IBO anchors on slopes and in difficult access areas. In the Hard Glacial Till areas these types of anchors can deliver 4,000 lb. to 6,000 lb. of pull-out load capability per foot of embedment into these hard materials. We have installed and tested hundreds of these types of Tieback Anchors.
Advantages of the IBO :
- Simple drilling system
- Suitable for cramped and limited-access conditions
- Low manpower requirement
- Good connection with surrounding soil due to drilling and grouting
- Soil improvement thanks to rotary impact driving and flushing
- Piles can be lengthened or shortened on site
- Suits all ground conditions
- Rapid, effective ground and structural stabilization(ground improvement)
Production Benefits:
- Single step casing free operation significantly improves productivity
- Suitable for difficult and restricted access situations
- Ability to use smaller drilling rigs reduces mobilization costs
Geotechnical benefits:
- Extreme low settlement characteristics – less than 5mm working load
- Enhanced mechanical bond with surrounding ground
- Minimal disturbance during installation
Material Benefits:
- No requirement for double corrosion protection in permanent works
- On site fabrication provides design flexibility
- Wide variety of drill bits to suit different ground conditions
Interested? Please contact:
Frank Russell
frankrussell@integralconstruction.com
Lic # INTEGCI159K3
206-362-4162
Mailing address:
19031 18th Avenue N.E.
Shoreline, WA 98155
Monday – Friday
8am to 5pm