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SECTION 51

CONCRETE STRUCTURES

355

The falsework shall be located so that falsework footings or piles are at

least 75 mm {3 inches} clear of railing posts and barriers and all other

falsework members are at least 0.3-m {one foot} clear of railing members and

barriers.

Falsework bents within 6 m {20 feet} of the center line of a railroad track

shall be sheathed solid in the area between 1 m {3 feet} and 5 m {17 feet}

above the track elevation on the side facing the track. Sheathing shall consist

of plywood not less than 16 mm {

5/8

inch} thick or lumber not less than

19 mm {

3/4

inch} thick. Bracing on these bents shall be adequate so that the

bent will resist the required assumed horizontal load or 22 kN {5,000 pounds}

whichever is greater.

The dimensions of the clear openings to be provided through falsework for

roadways shall be as specified in "Maintaining Traffic," of the special

provisions.

The dimensions of clear openings to be provided through the falsework for

railroads shall be as specified in "Railroad Relations and Insurance," of the

special provisions.

51-1.06B Falsework Construction

• The falsework shall be constructed to substantially conform to the falsework

drawings. The materials used in the falsework construction shall be of the quality

necessary to sustain the stresses required by the falsework design. When

manufactured assemblies are used in falsework, the Contractor shall furnish to the

Engineer a letter of certification which certifies that all components of the

manufactured assemblies are used in conformance with the manufacturer's

recommendations. The workmanship used in falsework construction shall be of the

quality that the falsework will support the loads imposed on the falsework without

excessive settlement or take-up beyond that shown on the falsework drawings.

• Falsework shall be founded on a solid footing safe against undermining,

protected from softening, and capable of supporting the loads imposed on the

falsework. When requested by the Engineer, the Contractor shall demonstrate by

suitable load tests that the soil bearing values assumed for the design of the

falsework do not exceed the supporting capacity of the soil.

• When falsework is supported on piles, the piles shall be driven to a bearing

value, as determined by the formula specified in Section 49-1, "General," equal to

the total calculated pile loading as shown on the falsework drawings.

• When falsework is over or adjacent to roadways or railroads, all details of the

falsework system which contribute to horizontal stability and resistance to impact,

except for bolts in bracing, shall be installed at the time each element of the

falsework is erected and shall remain in place until the falsework is removed.

• Temporary railing (Type K), conforming to the provisions in Section 12-3,

"Traffic-Handling Equipment and Devices," shall be installed on both sides of all

vehicular openings through falsework and, when ordered by the Engineer, at all

other falsework less than 3.6 m {12 feet} from the edge of a traffic lane.

Temporary railings shall begin approximately 46 m {150 feet} in advance of the

falsework and shall extend past the falsework, in the direction of adjacent traffic

flow. For 2-way traffic openings, the temporary railing shall extend at least 18 m

{60 feet} past the falsework, in the direction of adjacent traffic flow. The location

and length of railing and the type of flare to be used shall be as ordered by the

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