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April 2014 Archives

Kana Pipeline, Inc.

April 23, 2014 | Comments: 0

Pipeline Trenching

Now that we have discussed the different types of soil that OSHA recognizes, let's talk about how to test to determine these different soil types. When preparing trenching activities the three most common methods to test a construction site's soils are: a visual test, a plasticity test, the pocket penetrometer test. Testing soil is an important element in preventing trenches from collapsing.

First, a Visual Test is a purely qualitative evaluation of the condition in and around the entire pipeline construction jobsite. Here one looks at the soil being excavated as well as the soil next to the construction site. If the soil is in clumps, it is cohesive. Otherwise, it may be considered granular it if appears to be course-grained, gravel or sand-like. Signs of vibrations are checked, for i.e. crack-line openings along certain zones that would indicate tension cracks, or any existing utilities that indicate that the soil has been previously disturbed. Also, the exposed sides of the excavations are looked at for any layered geologic structuring. Any stresses, deformations and water intrusion should also be quickly taken into account and remedied accordingly, as these can cause trench failure.

Water and Sewer Pipeline on "Pipeline Trenching"