Remove large concrete piers:
1. Determine the weight of the piece of concrete that your equipment can safely lift.
2. Drill a line of holes about 2 feet apart.
3. Drill a second line of holes at least 1 foot below the first line.
4. Place several splitters in the top line break. Do the same at the bottom line. You should have two broken lines that run through the width of the piece.
5. Drill a 3rd line of holes between the two broken lines about 1-1/2 feet apart.
6. Place a plitter into the nearest hole at the end and break the section on a 45 degree angle. This will break the bond on the rebar in both directions. This broken section can be removed with a light hammer.
7. Drill several holes through in order to pass a cable through and snug it up with your lift before cutting rebar.
8. When the area between the line breaks have been removed, the exposed rebar can be cut and the entire section can be lifted and removed.
Removing bridge pier tops
Method for the removal of bridge pier tops to road level in order to extend additional lanes. Two splitters are required for this procedure.
Drill two holes, approximately one foot from each end of column, preferably through the column to give maximum splitting control(Fig.A)
Two #12 splitters workign together will control this first break and prevent any fractures from carrying past this line into the concrete that is to remain. This break separates the two parts of the column.
Second, after the horizontal break, the vertical splits are made to remove the top. Holes are spaced(black dots) and drilled vertically about 1-1/2 feet apart. (see Fig.B for hole pattern.)
Note that a 45 degree breaking angle is used to break the bond on the rod.(see Fig.B). Arrows show the splitter should be positioned to make this break.”
See page No.5
Third(Fig.C). the broken concrete can now be removed with chipping hammers or pry bars. Rods can be cut or burned. The procedure is a fast and effective way to remove whole or parts of concrete columns without damaging the remaining section.
Call for recommended tool size including enlarging feathers.
Breaking openings in concrete walls
After the opening is determined, the first step is to drill a pattern of holes at each corner. These drilled holes will prevent the final splits from going past the planned corner. See Fig.D,E and F for the suggested drilling and spacing.
When breaking into a solid face such as a concrete wall, you must create an open face in order to move the broken peice. See below for a suggested method to ceate an open face to slot. Fig.A. Below also describes the steps in breaking peices from the drilled slot.(See. Fig.C.)
Methods of line drilling
A series of 2-1/2” diameter holes drilled on 4” centers is the first step. Next drill our the space between the holes using the 2-1/2” hole size. When completed, this will provide a slot. This line drilling method will create a face to break to .
The same method is used to make a corner slot. See Fig.B An alternative method is to drill two 2-1/2” holes on 6-1/4” center4s. Then drill a 4”hole between each smaller hole.
A ‘guide’ is required to hold the drill in the correct position if you use this method.
A line slot or a cormer slot can be created by using one or the other method described.(see drawings)
After a slot is created in the center of the planned opening, a hole(#1) is drilled very close to the slot and a break is made.#2 hole is drilled and a second break is made. Note that the lines from each hole indicates the direction the handle mst be in to push the concrete toward the open slot. After the first several breaks are made and the opening becomes larger, the spacing of the holes can increase.
Depending on the thickness and hardness of the concrete determine how far from the face each set of holes must be placed. Note the holes should be in a circular pattern around the slot as you begin the opening.