- 640 - SECTION 724 -- INSTALLATION AND REMOVAL OF FLARED-END SECTIONS
724.01 Description
1.As described in the contra ct, the Contractor shall:
a.Furnish and install new flared-end sections. b. Remove, salvage, and reinstall flared-end sections. c. Remove and dispose of flared-end sections.
d.Reinstall Department furnished flared-end sections.
2.Flared-end sections shall be manufactured as integral units so they may be readily installed and joined with the culvert pipe as shown in the contract.
3.The Contractor shall stockpil e and reinstall concrete and metal flared-end sections and bar grates at the locations shown in the contract.
724.02 Material Requirements
1.Metal flared-end sections for culvert pipe shall conform to the applicable requirements of Section 1036 for the diameter of pipe on which they are to be installed.
2.Concrete flared-end sections for use on concrete pipe shall conform to the applicable requirements of AASHTO M 170/M 170M–95, M 206/M 206M-95, or M 207/M 207M-95, for Class II pipe.
3.The Contractor shall not order any flared-end section until a correct list of sizes is provided by the Engineer.
724.03 Construction Methods
1.The Contractor shall excavate and backfill in accordance with the requirements of Section 702.
2.Flared-end sections to be removed and salvaged shall be removed in such a manner as to avoid damage to the flared-end section and the pipe when the pipe is salvaged. The salvaged flared-end sections shall be cleaned to remove accumulations of dirt and debris and stored at a location designated by the Engineer.
3.The Contractor shall install fl ared-end sections in accordance with the requirements of Section 719 or 720, depending on the type of end section.
4.Flared-end sections with bar grates may be removed as a unit; or, at the Contractor's option, the bar grate may be removed before the removal of the flared-end section.
724.04 Method of Measurement
1.A new flared-end section is measured by the each as "_____ inch (mm) _____ Flared-End Section". Included is a new flared-end section and its installation.
2.Flared-end section removal is measured by the each as "Remove Flared-End Section".
3.Flared-end section removal and salvage is measured by the each as "Remove and Salvage Flared-End Section." Installation and Removal of Flared-End Sections 724.05 - 641 - 4. Installation of salvaged or St ate furnished flared-end sections is measured by the each as "Install _____ inch (mm) _____ Flared-End Section".
5.New flared-end sections for cu lverts are measured by the each as "_____ inch (mm) Flared-End Section" when the Contractor has an option as to the type of pipe to use.
6.The cost of necessary connection bands are subsidiary to the appropriate flared-end section pay item.
724.05 Basis of Payment
1.P a y I t e m P a y U n i t _____ inch (mm) Flared-End Section Each (ea) Install _____ inch (mm) _____ Flared-End Section Each (ea) Remove Flared-End Section Each (ea) ______ inch (mm) _____ Flared-End Section Each (ea) Remove and Salvage Flared-End Section Each (ea) 2. Excavation required for the work of removing or installing the flared-end sections which is beyond the pay limits of excavation for installing or removing the culvert pipe in Figure 701.01 will not be measured or paid for directly, but shall be considered subsidiary to the flared-end section removal and/or installation pay item.
3.Removal and reinstallation of bar grates is subsidiary to the appropriate flared-end section pay item.
4.Flared-end sections for the pay item "Install _____ inch (mm) _____ Flared-End Section" shall be eit her salvaged or State furnished.
5.The cost of necessary connection bands except concrete collars are subsidiary to the appropriate flared-end section pay item.
6.Collars required when a tongue and groove connection on concrete pipe is not possible or an annual end is not presented on corrugated metal pipe shall be paid for as described in Subsections 720.04 and 720.05.
7.Payment is full compensation for all work described in this Section. - 642 - SECTION 725 -- BAR GRATES FOR FLARED-END SECTIONS
725.01 Description
1.This work shall consist of furnishing, installing, and painting/galvanizing bar grates on concre te or metal flared-end sections at the locations shown in the contract.
725.02 Material Requirements
1.Unless otherwise specified, bar s for bar grates shall be round, smooth bars conforming to the mechanic al requirements of Section 1044.
2.Plates shall be structural st eel conforming to the requirements of Section 1045.
3.Bar grates shall not be orde red until the Engineer provides the Contractor a complete list of all required bar grates.
725.03 Construction Methods
1.The Contractor shall accurately and neatly drill the holes and mount the bar grate in the flared-end sections . Holes required for installing the bar grate on the concrete flared-end section may be formed in the concrete during casting.
725.04 Method of Measurement
1.Bar grates of each different size and kind will be measured for payment by the each.
725.05 Basis of Payment
1.P a y I t e m P a y U n i t Bar Grate for _____ inch (mm) Flared-End Section Each (ea) Bar Grate for _____ inch (mm) _____ Each (ea) Flared-End Section Bar Grate for ____ inch (mm) _______ Each (ea) Round Equivalent Flared-End Section
2.Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 674–675 of 1,048.