HAND RAILING
633.01 Description. This item shall consist of the construction
of concrete walks, concrete steps, and/or hand rail ing according to these specifications and in conformity with the loc ations, lines, and grade shown on the plans or as directed.
633.02 Materials. The concrete shall comply with the
requirements for Class M Concrete as provided in S ection 802. The maximum allowable slump shall be 4 inches (100 mm). The maximum water/cement ratio shall not be exceeded. The Department will perform all acceptance sampling and testing at the frequencies shown for Contractor acceptance testing in Subsection 802.06. Steel pipe and fittings for hand railing shall be c ommercially available hot-dip galvanized Schedule 40 steel pipe meeting the requirements of Subsection 106.01. As an alternate , hand railing sections may be hot dipped galvanized after fabrica tion. Plates shall comply with AASHTO M 270 (Grade 36) and shall be ga lvanized 519 according to AASHTO M 111. Nuts, bolts, and washer s shall comply with ASTM A 307, Grade A, or AASHTO M 314, G rade 36, and shall be galvanized according to AASHTO M 232 o r, ASTM B695 Class 40 or 50. After galvanizing, the nuts s hall be free running on the bolts.
633.03 Construction Requirements. (a) Subgrade. The
subgrade shall be excavated or filled to the requir ed grade. Soft and yielding material shall be removed and replaced wit h suitable material and the entire subgrade shall be thoroughl y compacted with approved mechanical equipment.
b.Forms. Forms shall be constructed of metal or wood, free from warp, and of sufficient strength to resist spr inging during the process of depositing concrete. They shall be secu rely staked, braced, set, and held firmly to the required line a nd grade. Forms shall be cleaned and oiled before concrete is place d against them.
c.Placing and Finishing. The concrete shall be deposited in the forms upon the wetted subgrade to such depth th at when it is compacted and finished, the top shall be at the req uired elevation. It shall be thoroughly consolidated and the edges alon g the forms spaded to prevent honeycomb. The top shall then be struck off with a straightedge and tamped or vibrated sufficiently to flush mortar to the surface, after which it shall be given a Class 6 finish according to Section 802.19. Edges shall be rounded with a ¼" ( 6 mm) radius, including edges at joints. A weakened plane shall be formed to a depth of 1 ″ (25 mm) and the edges shaped using a ¼" (6 mm) wide jointing to ol. These joints shall be formed at intervals not greater than the w idth of the walk being constructed, or as directed. Forms shall be removed from exposed surfaces of ste ps within 24 hours, and the surfaces finished by rubbing with a wetted cement mortar brick or wood float until it is smooth. Pla stering will not be permitted, but minor defects shall be filled with a 1:2 cement mortar (1 part Portland cement to 2 parts concrete sand) a pplied with a wood float. When completed, the concrete shall be cured as spec ified in Section 501, except that only clear curing compound may be used. 520 (d) Backfilling. After the forms have been removed, the spaces on each side of the walks or steps shall be backfil led with suitable material, which shall be firmly compacted by means of approved mechanical equipment and neatly graded.
e.Expansion Joints. A space not less than ½" (12 mm) wide shall be left between the sidewalks and adjacent st ructures. This space shall be filled with approved joint filler co mplying with AASHTO M 213. No space or joint filler is required between the sides of the walks and adjacent curbs. Transverse expansion joints shall be placed at a ma ximum interval of 45 ′ (13.7 m). Transverse joints shall be constructed using a joint filler complying with AASHTO M 213.
f.Hand Railing. Railing shall be erected in a workmanlike manner, straight and true to line and grade. The p osts shall be set in concrete or bolted down by use of steel plates as s hown in the plans. The joining of rails between posts by means of slee ves, couplings, or welding will not be permitted. All joints shall be welded with ¼" (6 mm) fillet we lds according to Subsection 807.26. Field galvanizing shall be p erformed using materials listed on the Department’s Qualified Prod ucts List and shall be applied in accordance with the manufacture r’s recommendations.
633.04 Method of Measurement. Concrete Walks and Steps
will be measured by the square yard (square meter). The area measured for steps will be that of the treads only. Hand Railing will be measured by the linear foot (m eter) in place. The measurement will include the distance from the centers of each end post of each separate section of railing, withi n the limits shown on the plans or as designated by the Engineer.
633.05 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for at the contract unit price bid per square yard (square meter) for Concre te Walks or Concrete Steps, which price shall be full compensat ion for furnishing materials including joint filler; constr ucting the concrete walks or concrete steps; for excavation and backfil ling; and for all labor, equipment, tools, and incidentals necessary to complete the work. 521 Hand railing, completed and accepted and measured a s provided above will be paid for at the contract unit price b id per linear foot (meter) for Hand Railing, which price shall be full compensation for furnishing, preparing, hauling, and erecting all ma terial; and for all labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit Concrete Walks Square Yard (Square Meter) Concrete Steps Square Yard (Square Meter) Hand Railing Linear Foot (Meter)
Source: , Edition.