Agur Boring: Figure 1: AUGUR
Agur Boring: Figure 1: AUGUR
Agur Boring: Figure 1: AUGUR
Figure 1: AUGUR
The typical auger boring installation begins with the
installation of bore pits at the beginning and end of the proposed
bore. Bore pit dimensions vary depending on the size and length
of the casing being used and on the depth of the boring. The
bottom of the bore pit is usually over-excavated and backfilled
with crushed stone in order to provide adequate support for the
equipment. In auger boring, the auger rotates inside the casing as
it is being jacked. Consequently, there is a danger that any
interior pipe coatings may be damaged by the process. Due to
the rotating augers and spoil removal process the interior of the
casing pipe is subjected to during installation, the standard
casing material used for auger boring is steel. The most common
pipe sizes installed by auger boring are from 8 inches to 36
inches.
The boring machine applies thrust in order to advance the carrier
pipe. This thrust is applied against the back of the boring pit
with hydraulic rams. In order to withstand this thrust, a backing
plate is normally installed against the back wall of the boring pit.
This backing plate normally consists of steel piling, a steel plate,
or wooden timbers.
The bore is begun by carefully installing the first section
of casing pipe to the correct line and grade. After the first
section has been installed and checked for accuracy, the boring
machine is disconnected from the casing pipe and auger and slid
to the rear of the bore pit. The next section of casing pipe and
auger are lowered into position. The second auger section is
coupled to the first with an auger pin. The two casing sections
are lined up and either welded together, or an interlocking
casing pipe jointing system may be utilized.
Figure 2: AUGUR BORING