In some remote works area or when the bulky compaction work is to be carried out beyond 1200mm below formation level, the site supervisor could suggest to use a what we called the “ product specification ” to determine the relative compaction of the backfill. To begin, we set out and agree with the Engineer …
The California Bearing Ratio (CBR) test is a simple strength test that compares the bearing capacity of a material with that of a well-graded crushed stone (thus, a high-quality crushed stone material should have a CBR @ 100%). The CBR rating was developed for measuring the load-bearing capacity of soils used for building roads. The CBR …
This test will be carried out by the laboratory staff on-site or at the borrow area. Before the backfilling work starts, the site supervisor should know where about is the borrow area and should inform the laboratory staff well in advance to allow them to conduct proctor tests for the respective backfilling materials. The test …
This test is to be conducted by laboratory staff to determine the degree of compaction after the layer of sandfill or DG material has been compacted. 1. Hand dig an insitu core sample from the compacted soil and weigh to get the mass of test sample. [ Note : It is usually to pick out …
This test is to be carried out by the laboratory staff on site. When excavation has proceeded to the designed formation level of a structure, the ER may need to ascertain the bearing capacity of that layer of insitu soil before approval is given to blinding concrete. In case the existing soil condition is not …
If a portable, battery-operated echo sounder is to be affixed to the side or bottom of the workboat to detect the water depth or seabed profile, the echo sounding result must be calibrated after the set-up by a bar check test to determine its accuracy. The test is simply conducted by a diver to measure …
This is another means of carrying out internal inspection inside small-diameter pipelines. The CCTV camera is being moved through the pipeline at a constant speed and stop wherever to allow inspection from the display screen, to take video and photographs as necessary. The site supervisor should prepare the key plan to locate the pipelines being …
Pigging in the maintenance of pipelines refers to the practice of using pipeline inspection gauges or ‘pigs’ to perform various operations on a pipeline without stopping the flow of the pipeline. The cleanliness, bore, linearity and joints inside the small diameter, say 450mm or less, drainage pipelines will be tested by pulling a mandrel through …
This test is to be set up and conducted by the site supervisor and is used to test for any infiltration and water leakage occurs in the sewage pipeline system which includes all the branches and pipelines, manholes, chambers and structures. Since a great amount of water will be used for ponding the pipeline system, …
This test will be set up and conducted by site supervisor and the procedures in brief are as follows : – 1. Water test on pipeline should be carried out on the complete pipeline between manhole and manhole or manhole and structure as much as practicable.2. Short branch pipelines could be tested together with the …
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