Part 1 — General
1.1 Section Includes
A.Excavation for and backfilling of bridges, foundations, box culverts, pipe culverts, drains, and other structures.
1.2 Related Sections
A.Section 02056: Embankment, Borrow, and Backfill
1.3 References
A.AASHTO LRFD Bridge Construction Specifications
1.4 Definitions Not Used
1.5 Submittals
A.Drawings for Temporary Works, for review.
1.Includes shoring, bracing, and cofferdams.
Part 2 — Products
2.1 Backfill for Structures
A.Embankment Material. Refer to Section 02056.
2.2 Drainage Pipe Backfill
A.Refer to Section 02056.
Part 3 — Execution
3.1 Preparation
A.Design and construct temporary works according to AASHTO LRFD Bridge Construction Specifications, Section 3 (Temporary Works).
B.Provide a cofferdam for underwater work.
1.Remove all cofferdams, sheeting, and bracing when no longer needed.
3.2 Excavation
A.Structural excavation includes:
1.Excavating for structure foundations.
2.Control and removal of water.
a.Dewater the excavation if ground water is encountered.
b.Continue dewatering activities as necessary to prevent damage to the work.
3.Installation and removal of facilities required to complete the work unless specified or allowed to remain in place.
B.Excavate rock and other hard strata to elevations and dimensions shown.
1.Clean and cut to a firm surface as shown.
a.Foundation cannot contain loose material.
2.Clean out seams and fill with concrete, mortar, or grout.
C.Over-excavate and waste unsuitable material for the structure foundation to at least 1 ft below the elevation shown when directed by the Engineer.
1.Cost of over-excavation is paid as extra work when directed by the Engineer.
D.Clean the areas in and near channels which were affected by operations, to prevent scour and waterborne debris.
E.Dispose of all unused excavation material.
3.3 Backfill and Compaction
A.Backfill and compact excavated spaces not occupied by abutments, foundations, and other permanent work as described. Refer to Section 02056.
1.Backfill to the surface of the surrounding ground, with a sufficient allowance for settlement.
2.Bring backfill up uniformly on all sides of structures.
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Source: Utah Standard Specifications for Road and Bridge Construction, 2027 Edition. Pages 283–284 of 1,343. View official source ↗