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| | | Concrete Lined Pit | | |
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| | | | | | | | | | | | | | | When soil conditions require, or when using partial coverage base, form and cast in place a concrete lined pit. Place lB-500 materials inside, using either full or partial coverage as addressed in previous illustrations. | ," -A. | | | | | | | | | |
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| | | This method of construction is used where soil conditions are less than ideal, or when it is desirable to provide a positive seal against contaminates reaching the sub soil. This creates a "socket" for the isolation material and inertia block foundation to be placed. | | |
| | | Here a mud mat is poured, then IB-500-B1 base material is applied in strips to achieve the desired pad loadings. In the foreground a sheet of treated plywood is being installed to protect the integrity of the spaces between the strips of base material (to prevent fluid concrete from entering the spaces). Notice that there is a strip of IB-500-B1 material around the perimeter of the base of the foundation as well as across (the full length). | | |
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| | | Following is a photograph showing a Concrete Lined Pit type foundation taken on an actual job site. | | |
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| | | (Concrete work completed) | | |
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| | | In this instance a concrete lined pit has been prepared due to less than ideal soil conditions. Note the "stepped" construction to establish the desired machine height. | | |
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| | | Oversize Excavation | | |
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| | | In this photo a Unisorb Poly Pit Liner is being installed over the treated plywood sheeting. | | |
| | | | | | | | | | | | | | | After pouring foundation in oversize pit, apply IB-500-S2 to sidewalls and backfill. Compact soil and complete concrete work to joint. | ^^^^^^ | | | | | | | | | |
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| | | The third acceptable method for installing Unisorb IB-500 materials is to dig an oversize pit. Here the foundation is poured directly on the IB-500-B1 base isolation material using removable forms to contain the perimeter. Once sufficiently cured, the sidewall forms are removed, and the isolation material is applied to the sidewalls. The pit is then backfilled directly against the IB-500-S2 sidewall material. This method is very cost effective when sufficient clearance is available to permit the larger excavation. | | |
| | | Here we have another view of the same foundation ready for the placement of the reinforcing steel and concrete. | | |
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