Custom Search
|
|
|
||
 Table 1-1
Typical Performance Rates for Inspection Tasks1
PILES
INSPECTION
BULKHEADS
TASK
300-600 Piles/Day
500-1500 LF/Day
Swim-By
-
__-_--------------
---
500-1500 LF/Day
30-70 Piles/Day
Cleaning
____
Cleaning
3-15% of All Piles
50-300 LF Intervals 2
Sample Rate
--
Concrete
Wood
Steel
50-200
30-60
30-70
Measurements
Piles/Day
Piles/Day 500-1500 LF/Day
Piles/Day
--------
3-15% of
3-10% of
5-15% of
Measurement
50-300 LF Intervals 2
All Piles All Piles All Piles
Sample Rate
NOTES: 1. Wide range of rates encompasses the combined effects of many
influencing factors as delineated in paragraph 1.4.3.2. The effect of each
of these factors on an inspection can vary drastically and must be evaluated
to determine a resultant rate for the specific conditions of each inspection.
2. Small areas are cleaned at one or two elevations spaced apart at
random intervals.
1.4.3 Structure Cleaning. Decisions are made on site regarding the
selection of specific structural elements (such as piles) and specific areas
on those elements to be cleaned and measured. These decisions will be based
on actual conditions of structures and the environment, especially
b i o f o u l i n g . Since the cleaning costs represent a large portion of the
inspection costs, it is important to minimize cleaning time by the use of
s p e c i a l t o o l s . The methods of cleaning commonly used include:
a. Chipping hammer and chisel.
b. Wire brush.
Hydraulic rotary brushes, grinders and scrapers.
d. High pressure water jets.
Cavitation erosion jet.
f . Sand blaster.
1.4.3.1 Locations. Surfaces cleaned for measurements are required
to be free of any corrosion accumulation or biofouling. Bare surfaces are
required for most measurements and bright metal surfaces are needed for
11
|
 
|
|
|
||
