WOOD STRUCTURES SECTION 621 314 SECTION 621 — WOOD STRUCTURES
621.1Description.
This work consists of constructing wood structures and the wood portions of composite structures.
621.2Materials.
621.3Construction.
in the dimensions of the members before assembly. Reject wood that shrinks during storage, causing predrilled grooves for split rings, plate size, or bolt h ole spacing to change.
inches above the ground and open -stacked. Stack treated material on supports at least 12 -inches above the ground surface and close -stacked. Provide cover to protect materials from the weather.
using metal bands to bundle members.
filled with bolts or other items, with preservative -treated plugs flush with the surface.
as recommended by the manufacturer. Force spike grids into the wood so that members are in firm contact. Use pressure equipment that does not damage the woo d surface. Replace temporary high -strength bolts with specified bolts for the final installation. Embed all connectors at the joint simultaneously and uniformly. Cut connector grooves in wood, concentric with the bolt hole. Make grooves conform to the cross-sectional shape of the rings and provide a snug fit. Make the inside groove diameter larger than the nominal ring diameter. Fabricate structural members using connectors before preservative treatment. Drill bolt holes perpendicular to the face of the mem ber.
bolt or dowel. Drill holes for square drift bolts or dowels equal in diameter to the least dimension of the bolt or dowel. Drill the holes for machine bolts 1/16 -inch greater than the diameter of the bolt. Drill the holes for lag screws with a bit no larger than the body of the screw at the base of the threaded portion. Drill the hole for the shank 1/16 -inch greater than the diameter of the shank and to the s ame depth as the shank. Use a washer under bolt heads and nuts that would otherwise come in contact with wood, except for timber bolts with economy - type heads. Tighten all nuts to a snug fit condition. Retighten all nuts after full assembly. Lock the nuts of bolts after final tightening by burring or other approved method.
formed for countersinking in treated timber, in accordance with Section 1041.4.E. WOOD STRUCTURES SECTION 621 315 E. Cut and frame lumber and timber to a close fit with joints bearing evenly over the entire contact surfaces without requiring shims. The engineer will reject open joints. Ensure that all framing is true and exact. Set the nail heads flush with the surfac e of the wood. The engineer may consider hammer marks in wood surfaces as evidence of poor work quality and cause for removing the responsible crew member.
tops of the supporting piles. Secure caps by drift bolts at least 3/4 -inch in diameter, extending at least 9 -inches into the piles. Place the drift bolts approximately 2 -inches off -center of the pile to avoid conflicts with other hardware.
secured directly to the pile or nailing block. Secure horizontal backing with a minimum of 2 lag screws with washers at least 3/8 -inch in diameter for each pile , extending at least 4 inches into the piles. Place the lag screws approximately in the center of the pile and recess the heads below the top of the sheeting. Use tongue -and-groove lumber for vertical members of wood backing. Place vertical members of wood backing plumb and secured directly to the horizontal backing. Secure vertical backing with a minimum of 2 lag screws with washers at least 3/8 -inch in diameter to each of the top 2 rows of horizontal backing. Place the lag screws a minimum of 2 -inches into the horizontal backing but do not extend through the horizontal backing.
bolt of no less than 5/8 -inch in diameter. Use bracing long enough to provide a minimum distance of 8 inches between the outside bolt and the end of the brace.
near edges in the top portions of the stringers. Join outside stringers with lap joints or butt joints with the ends cut on a taper. Lap -join interior stringers to take bearing over the full width of the floor beam or cap at each end. Stagger the joints when stringers are 2 panels in length. Fasten all stringers by drift bolting. Place cross -bridging or blocking at the center of each span. Frame the cross-bridging between stringers and toenail with at least 2 nails in each end. Provide full bearing of cross -bridging members, at each end, against the sides of stringers. Cut blocking to a snug -fit condition and secure by nailing.
single thickness of plank supported by stringers or joists. Lay the planks heart side down.
material, or material treated with oil -borne preservatives.
borne preservatives.
thickness by more than 1/8 -inch. Provide a finished surface free of defects.
preservative treatment in accordance with Section 1041.4.A. Apply a preservative treatment to untreated field -cut or drilled areas. Plane bottom of deck panels only. Leave the top of the deck rough to ensure proper bonding with bituminous material. Remove excess oil by absorption before paving. Avoid damaging panels when handling and transporting. Protect the edges from damage and provide proper dunnage for deck panels during storage. WOOD STRUCTURES SECTION 621 316 L. Frame and erect wheel guards true to line and grade. Use wheel guards, rails, and rail posts surfaced on 4 sides. Lay wheel guards in sections no less than 12 -feet long, except where necessary to match expansion joints or end joints.
621.4Method of Measurement.
will only include material that is a part of the completed and accepted work. The Department will measure material used for temporary works in accordance with Section 604.
accepted, computed from the actual dimensions and actual lengths.
cross -sectional dimensions and actual lengths. The Department will measure quantities for glue - laminated girders, beams, and deck panels by the number of MFBM placed and accepted.
the Department will provide separate payment.
621.5Basis of Payment.
applying preservative treatment, and placing all material.
ITEM DESCRIPTION UNIT 621000 WOOD STRUCTURES, LUMBER MFBM 621001 WOOD STRUCTURES, TIMBER MFBM 621002 WOOD STRUCTURES, GLUE -LAMINATED GIRDERS AND BEAMS MFBM 621003 WOOD STRUCTURES, GLUE -LAMINATED DECK PANELS MFBM
BEARING DEVICES SECTION 623 317 SECTION 623 — BEARING DEVICES
623.1Description.
This work consists of fabricating, providing, and installing bearing devices.
623.2Materials.
specified edition of the AASHTO LRFD Bridge Construction Specifications, including materials, fabrication, and testing.
623.3Construction.
Construction Specifications, Chapter 18.
the materials proposed for use. Provide the seal of a professional Delaware engineer. Do not begin fabrication until receiving the engineer's approval of the d rawings. Include the following in the working drawings:
representative responsible for coordinating production, inspection, sampling, and testing.
required grouped first according to load range type and then grouped by actual design capacity.
conform to the approved processes of the specified AASHTO/AWS D1.5 Bridge Welding Code.
of bearing.
horizontal load, rotation, and movement capacity; and maximum design coefficient of friction as noted in the contract.