Laserfiche WebLink
1 until completion of the following: <br />1. Acceptance of construction below finish grade including <br />waterproofing and perimeter insulation. <br />' 2. Inspection, testing, approval, and recording locations of <br />underground utilities. <br />3. Removal of shoring and bracing, and backfilling of voids with <br />satisfactory materials. <br />E. Haunching <br />1. Proper haunching provides a major portion of the pipes strength <br />' and stability therefore care must be exercised in insure placement <br />and compaction of the embedment material in the haunches. For <br />larger diameter pipes ( >30 ") embedment materials should be <br />worked under the haunches by hand. Haunching materials may be <br />Class I, II, or III and must be placed and compacted in 8" maximum <br />lifts, compacted to 90% standard proctor density. <br />F. Initial Backfill: <br />1. Initial backfill materials are required to a minimum of the pipe <br />diameter for proper structural performance of the pipe. The ASTM <br />specifications extend the initial backfill from the springline to 6 " -12" <br />above the pipe to provide protection for the pipe from construction <br />operations during placement of the final backfill and protect the <br />pipe form stones or cobbles in the final backfill. For proper <br />1 01106 02221 -10 05 -5564 <br />C. Foundation <br />1. A stable foundation must be provided to insure proper line and <br />grade is maintained. Unsuitable foundations must be stabilized at <br />the engineer's direction. Unsuitable or unstable foundations may be <br />undercut and replaced with a suitable bedding material, placed in <br />6" lifts. Other methods of stabilization, such as geotextiles may be <br />appropriate based on the engineer's judgment. <br />' <br />D. Bedding: <br />' <br />1. A stable and uniform bedding shall be provided for the pipe and <br />any protruding features of its joints and /or fittings. The middle of <br />the bedding equal to 1/3 of the O.D. should be loosely placed, with <br />' <br />the remainder compacted to a minimum of 90% standard proctor <br />density. Class I, II, III <br />and materials are suitable for use as bedding. <br />E. Haunching <br />1. Proper haunching provides a major portion of the pipes strength <br />' and stability therefore care must be exercised in insure placement <br />and compaction of the embedment material in the haunches. For <br />larger diameter pipes ( >30 ") embedment materials should be <br />worked under the haunches by hand. Haunching materials may be <br />Class I, II, or III and must be placed and compacted in 8" maximum <br />lifts, compacted to 90% standard proctor density. <br />F. Initial Backfill: <br />1. Initial backfill materials are required to a minimum of the pipe <br />diameter for proper structural performance of the pipe. The ASTM <br />specifications extend the initial backfill from the springline to 6 " -12" <br />above the pipe to provide protection for the pipe from construction <br />operations during placement of the final backfill and protect the <br />pipe form stones or cobbles in the final backfill. For proper <br />1 01106 02221 -10 05 -5564 <br />