617.05 Footings for Arches. Footings for arches shall be constructed in accordance with the design shown on the plans and with the requirements prescribed in other sections for the several kinds of work involved. 617.06 Erection. Structural-plate pipe, pipe-arches, and arches shall be erected in their final position by connecting the plates with bolts at longitudinal and circumferential seams. Drift pins may be used to facilitate matching of holes. All plates shall be placed in the order recommended by the manufacturer with joints staggered so that not more than three plates come together at any one point. All bolts shall be drawn tight, without overstress, before beginning the backfill. After pipe or arches have been erected all spots where damage has occurred to spelter shall be given two coats of approved hot asphalt paint, or shall be wire brushed and given 2 coats of zinc dust-zinc oxide paint, as directed by the Engineer. Method of Measurement 617.07 Structural-plate pipe, pipe-arches, and arches will be measured in linear feet, installed in place, completed, and accepted. The number of linear feet will be measured along the invert center line for pipe and pipe arches, and the average of the springing line lengths for arches. Basic of Payment 617.08. The quantities, determined as provided above, will be paid for at the contract price per unit of measurement, respectively, for each of the particular pay items listed below that is shown in the bid schedule, which prices and payment will be full compensation for the work prescribed in this section, except excavation and backfill which will be paid for as prescribed in Sections 206 and 603, and footings for arches which will be paid for as prescribed in the applicable section of this book. Section 618.-CLEANING AND RECONDITIONING EXISTING DRAINAGE STRUCTURES Description 618.01 This work shall consist of cleaning and reconditioning existing pipe and appurtenant structures in reasonably close conformity with these specifications and as shown on the plans. Materials 618.02 Materials used for repair or replacement under the various pay items shall conform to the requirements of the applicable sections. Contruction Requirements 618.03 Pipe Removed and Cleaned. The pipe shall be carefully removed and cleaned of foreign material, both within the barrel and at the jointed ends. 618.04 Pipe Cleaned in Place. All foreign material within the barrel shall be removed and disposed of by methods which do not damage the pipe. If approved by the Engineer, all or part of the pipe designated to be cleaned in place may be removed, cleaned, and relaid in accordance with the applicable sections. In such cases, the Contractor shall furnish all material required to replace damaged pipes and joints, perform all excavation and backfill, and re-lay the pipe, all at the contract bid price for this item. 618.05 Re-laying or Stockpiling Salvaged Pipe. Re-laying of pipe selected by the Engineer to be removed and cleaned shall be done where shown on the plans, in accordance with the appropriate section for the kind of pipe involved. The Contractor shall furnish all jointing material and shall replace pipe broken by him, in sufficient lengths to complete the designated length to be re-laid without added compensation. Salvaged pipe to be stockpiled shall be placed where shown on the plans and as directed by the Engineer. No pipe which has sustained structural damage shall be placed in stockpiles. The Contractor shall dispose of such damaged pipes at an approved location. 618.06 Reconditioning Drainage Structures. Structures such as manholes, inlets and the like, designated on the plans or directed by the Engineer to be reconditioned shall have all debris removed, leaks repaired, missing or broken metalwork replaced, and each structure left in operating condition. Method of Measurement 618.07 Measurement will be made of the number of linear feet of pipe acceptably cleaned, removed, re-laid or stockpiled as designated in the bid schedule, irrespective of the kind or size involved. Pipe removed, cleaned, and re-laid will be measured in final position. Pipe removed, cleaned, and stockpiled will be measured by totaling the nominal laying lengths of all pipe units acceptably removed, cleaned, and placed in the stockpile. Pipe cleaned in place will be measured along the flow line of pipe line acceptably cleaned as directed. Measurement of drainage structures reconditioned will be made by actual count of the total number of units of each type acceptably completed. Basis of Payment 618.08 The quantities determined as provided above will be paid for at the contract price per unit of measurement respectively, for each of the pay items below that appear in the bid schedule, which price and payment will be full compensation for the work of this section except excavation and backfill paid for under Section 206 in connection with re-laying salvaged pipe. Excavation and backfill necessary for pipe removal operations shall be done as part of the work of this section. The Contractor shall remove and replace without added compensation any pipe damaged by his operations and which cannot be acceptably repaired in place. Payment will be made under: Pay item ( ) Pay unit If no pay items from the list above appear in bid schedule, pipe removed will be considered as included in the work of Section 202. Section 619.-LOOSE RIPRAP Description 619.01 This work shall consist of stone riprap for bank protection furnished and constructed in accordance with these specifications and in reasonably close conformity with the lines, grades, and dimensions and at the locations shown on the plans or established by the Engineer. Materials 619.02 Stones shall be hard, angular, quarry stones of such quality that they will not disintegrate on exposure to water or weathering. Unless otherwise shown on the plans or in the special provisions, not more than 10 percent of the total volume of riprap shall consist of stones having a volume of less than one-half cubic foot (14.1 dm3) and at least 50 percent of the total riprap volume shall consist of stones having a volume of 2 cubic feet (56.6 dm3) or more as determined visually by the Engineer or by physical measurements. Construction Requirements 619.03 Foundation trenches and other necessary excavations shall be excavated by the Contractor as provided in Section 206, and approved by the Engineer before the placing of riprap is begun. The stones shall be handled or dumped into place so as to form the cross sections shown on the plans. Riprap materials shall be positioned in a manner that will provide uniform distribution of the various sizes of stone to produce a minimum practicable percentage of voids. Unless otherwise shown on the plans, the riprap shall extend from 2 feet (610 mm) below the bed of a stream to the apparent high water line. The face above low water line shall be reasonably uniform, free from humps or depressions, and with no excessively large cavities below or individual stones projecting above the general surface. Method of Measurement 619.04 The quantity of riprap to be paid for will be the number of cubic yards, measured in place, or tons of riprap, completed and accepted. At the option of the Engineer, riprap may be measured in the vehicle at the point of delivery. Basis of Payment 619.05 The quantities, determined as provided above, will be paid for at the contract price per unit of measurement, respectively, for each pay item listed below that is shown in the bid schedule, which prices and payment will be full compensation for the work of this section, except that excavation will be paid for as provided in Section 206. Payment will be made under: Pay item 619(1) Loose riprap--- Pay unit Section 620.-SPECIAL ROCK EMBANKMENT Description 620.01 This work shall consist of hand-laid or derrick/placed rock embankment, as designated in the bid schedule, constructed in accordance with these specifications and in reasonably close conformity with the lines and grades shown on the plans or established by the Engineer. Materials 620.02 Stones shall be sound and durable and furnished in a wellbalanced range of sizes meeting the requirements herein. Unless otherwise provided by the plans or special provisions, all stones shall be more than 2 cubic foot (14.1 dm3) in volume. For hand-laid embankment not less than 75 percent of the total volume of rock embankment shall consist of stones more than 1 cubic foot (28.3 dm3) in volume. For derrick-placed embankment, not less than 50 percent of the total volume of rock embankment shall consist of stones at least 12 cubic feet (0.34 m3) in volume as visually determined by the Engineer or by physical measurements. |