CULVERTS
607.01 Description. This item shall provide for the substitution of
precast reinforced concrete box culverts as an equa l alternate to cast in place box culverts, as further detailed below.
607.02 Materials. The manufacturer shall furnish design drawings for
each project sufficiently in advance of casting ope rations to allow for review by the Engineer. Precast units shall bear e vidence that the component materials have been tested and approved a nd the construction methods have been inspected by an inspector approve d by the Engineer.
607.03 Design. (a) Load and Resistance Factor Desig n. When a
cast in place box culvert has been designed meeting the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design S pecifications, current edition, with current interims, the precast box culvert proposed for substitution shall be designed to meet the LRFD Bri dge Design Specifications noted above. The design shall be ce rtified by a Professional Engineer, who is registered in any of the United States. The manufacture and furnishing of precast reinforce d concrete box culverts meeting these design specifications shall be according to ASTM C 1577. The manufacturer shall furnish a certifica tion to the Engineer that the units comply with ASTM C 1577 and that all steel materials incorporated in the units comply with Subsection 10 6.01.
b.Alternate Design. When a cast in place box culvert has not been designed meeting AASHTO LRFD Bridge Design Specific ations, , the precast box culvert proposed for substitution may be designed to meet the AASHTO Standard Specifications for Highway Bridges, 16 th Edition, with interims or the AASHTO LRFD Bridge Design Specifica tions noted 435 above. The design shall be certified by a Professio nal Engineer, who is registered in any of the United States. The manufacture and furnishing of precast reinforce d concrete box culverts shall be according to AASHTO M 259 or M 27 3, or ASTM C 1577, as applicable. The manufacturer shall furnis h a certification to the Engineer that the units comply with AASHTO M 259 or M 273, or ASTM C 1577, as appropriate, and that all steel material s incorporated in the units comply with Subsection 106.01.
607.04 Construction Requirements. Excavation and backfill shall be
according to the requirements of Section 801. The Department will perform acceptance sampling and testing of the comp acted backfill material in accordance with Subsection 210.10 at th e frequencies established in the Department’s Manual of Field Sampling and Testing Procedures . Precast reinforced concrete box culvert units shall be bedded on a foundation of firm and stable material, accurately shaped to conform to their base. When required by the plans, special bedding materia l shall be provided. Joints and joint materials shall comply with the re quirements of Section 606. Lifting holes shall be filled with mortar or concre te and cured as directed. When precast boxes are used to form multiple barrel structures, they shall be placed in conformance with the details sho wn on the plans. Material required between barrels shall be as shown on the plans. Connections of precast boxes to cast-in-place boxes or to any required headwalls, wingwalls, riprap, or other structure sh all comply with the details shown on the plans. Headwalls, wingwalls, and footings shall be accordi ng to the details of the plans, except that the overall widths of the he adwalls and footings shall be modified to fit the finished width of the various structures.
607.05 Method of Measurement and Basis of Payment. Precast
Reinforced Concrete Box Culverts will not be measur ed and paid for directly. Measurement and payment for precast culvert will be made on the same basis as for a cast in place culvert under Sec tions 802 and 804 for the length and size of culvert specified.
Source: , Edition.