733.1 Description. This work shall consist of furnishing and installing precast concrete box culverts as shown
on the plans or as directed by the engineer. Unless otherwise required in the contract, where the construction of cast-in-place single or multi-cell reinforced concrete box culverts is specified, the contractor shall have the option of constructing such culverts using precast reinforced concrete box sections and headwalls subject to the conditions specified in the contract.
733.2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically as
follows: Item Section Separation Geotextile 1011 Precast Concrete Box Culverts 1049 Plastic Joint Compound for Vitrified Clay and Concrete Pipe 1057 Tubular Joint Seal 1057 Mortars and Grout 1066
733.3 Construction Requirements.
733.3.1 Subgrade Preparation and Bedding. The excavation and backfilling for the precast box sections and
end sections shall be in accordance with Sec 206, except a layer of granular material at least 6 inches thick shall be placed immediately below the elevation of the bottom of the box and end sections. The granular material shall be in accordance with Sec 1007 for Type 1 aggregate and shall be placed to extend at least 18 inches on each side of the structure. The bedding shall be compacted to provide uniform support for the bottom of the box and end sections.
733.3.2 Placement. The individual box section shall be placed as shown on the plans with the groove end
upstream and the spigot end extended full length into the adjacent downstream section of box.
733.3.2 1 Joints.
733.3.2 1.1 All joints between individual box sections shall be sealed with an approved plastic joint compound
or a tubular joint seal. Trowel grade compounds shall be applied to both mating surfaces. Rope or tape-type plastic joint compounds and tubular joint seals shall be applied in accordance with the manufacturer's recommendations. Excess compound shall extrude from both the inside and outside of the joint when box sections are assembled. Excess compound shall be removed from the interior surface. The joint gap between individual box sections shall be uniform for the full perimeter.
733.3.2 1.2 Filter cloth 3 feet in width and double thickness shall be centered over the top and sides of all joints
between individual box sections with edges sealed with mastic or two-sided tape. Filter cloth shall be a separation geotextile in accordance with Sec 1011.
733.3.2 1.3 When cast-in-place concrete box culvert collars are shown on the plans and the alternate precast
option is used, precast box culvert ties may be used in place of collars in accordance with plans to connect individual precast box sections. Regular strength connections shall be supplied unless specified otherwise. When ties are placed in the wings, plans for the precast wing sections shall be signed and sealed by a professional engineer licensed in the State of Missouri and shall be provided to the engineer for review a minimum of two weeks prior to construction.
733.3.2 2 Lift and Core Holes. Lift holes shall be filled with expansive mortar or tapered precast mortar plugs
to provide a permanent watertight section, and shall be finished flush on the inside of the box. Lift and core holes are to be sealed with approved materials. Filter cloth at joints may be extended to cover patched holes in lieu of sealing.
733.3.2 3 Multi-Cell Box Culvert. When multi-cell box culverts are used, a 1 1/2-inch minimum space shall be
left between the adjacent precast sections. Following the installation of the end sections, the 1 1/2-inch space between the parallel sections shall be entirely filled with mortar for grout. After the mortar has attained sufficient strength, sections shall be backfilled in accordance with Sec 206.
733.4 Method of Measurement.
733.4.1 If the contractor chooses to construct the alternate precast box culvert, measurement will be made as
provided for the equivalent cast-in-place structure.
733.4.2 Final measurement will not be made except for authorized changes during construction or where
appreciable errors are found in the contract quantity. Where required, if a precast box culvert is specified in the contract, the precast box culvert, complete in place including end sections, will be measured to the nearest foot along the geometrical center of the culvert floor. The revision or correction will be computed and added to or deducted from the contract quantity.
733.5 Basis of Payment.
733.5.1 The accepted optional precast concrete box culvert, including end sections, will be paid for at the
contract unit price for each of the pay items included in the contract.
733.5.2 If a precast box culvert is specified in the contract, the accepted quantities for the precast box culvert,
complete in place including end sections, will be paid for at the contract unit price for each of the pay items included in the contract.
733.5.3 No direct payment will be made for furnishing, placing or compacting the Type 1 granular bedding
material. Replacement of unsuitable material below the 6-inch bedding will be paid for in accordance with Sec 206.
Precast Concrete Box Culverts in other states
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