Foundation repairs

The home we purchased was very charming.	But over time we discovered that cracks (which we were told were caused by a tree hitting the house years ago) were continuing to expand.	Geotechnical and structural engineers were brought in to find the problem and the solution. The root cause was concealed behind a wall in the garage.	A double-brick retaining wall, which supports a concrete slab above the garage, was slowly failing.	The wall has pushed in at the top about 3", causing the slab above (which forms the roof of the garage) to rotate counter-clockwise, making cracks in the brick and threatening the stability of the house.
A crack monitor shows how much the top of the retaining wall has moved from January - April of 2002. Not alot, but slow and steady.	A crack monitor was also placed at the rear of the garage at the other large crack.	A large crack runs from the top of the door frame to the bottom of the slab.	The crack monitor shows how much this crack has expanded from January - April of 2002.	Remedial contractors were brought in to fix the wall. A small hole was made in the retaining wall.
A soil anchor, like a corkscrew, was placed in the hole.	A hydraulic drill was used to turn the soil screw and drive it into the soil behind the retaining wall.	When one segment of steel was driven in, another segment was attached onto the end with bolts.	For this wall, 35' of steel was driven before the corkscrew-anchor bit hard enough soil to exceed engineer tolerances.	A threaded rod was attached at the end.
The hole in the retaining wall was patched...	...and the engineer-design support structure was installed.	The steel beams were bolted to the floor and ceiling slab and grout was wedged behind the vertical beems to provide uniform support to the wall.	We also had a dropped footer in the crawl space at the front of the house.	The remedial contractors dug out the footer.
The rough outside edge of the footer is squared-off. A bracket will be used to lift and support the dropped footer.	The bracket is attached to the footer...	...and another soil anchor, or pier, will be driven into the ground vertically and used to support the footer.	The hydraulic drill is used to drive the corkscrew-pier into the ground. In this instance, the contractor hit a new record depth of 86'.	A 4-ton jack is used to raise the bracket/footer's weight onto the top of the steel pier, which is then bolted off as shown.
The hole is re-filled and top soil replaced.	A slotted pipe is buried just below the surface to carry away any water which may collect at the doorway.	It shares the ditch with the gutter drain and a drain line for a sump pump which will be installed in the crawl space.	Water was seeping into the basement at the base of a ~40' wall which runs the length of the house and seperates the basement from the crawl space. This is part of the wall as seen in the crawl space.	The dirt in the crawl space along this wall was dug out to the footer. The wall was painted with foundation sealant. 4" slotted drain pipe was installed along the footer to take any water to a sump basin.
Since the footer is so deep below crawl space grade, a cage was built to allow access to the sump basin after backfill.	Rock was poured over the slotted drain pipe to help drainage.	The trench was backfilled.	The sump drain line was installed, and a GFCI-protected outlet was installed to power the sump.	You can see just how deep the sump basin sits relative to grade.
The sump pump is installed and works well.