624RAILROAD PROTECTION

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall include the installation and operation of gates, bell systems, warning lights, and other protective devices, all

as required by the Railroad to protect the operation and assure the safety of its equipment.

1.2Refer to 104.07 and the Special Provision to Section 104.07 for additional railroad information and requirements.

Method of Measurement

4.1Railroad Protection – Devices and Installation will be measured as a unit and shall include all labor and materials needed to

install and operate gates, bell systems, warning lights, and other protective devices. Basis of Payment

5.1Railroad Protection – Devices and Installation will be paid for at the Contract lump sum price.

Pay item and unit: 624.2_ Railroad Protection – Devices and Installation Unit

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This item shall consist of concrete light pole bases constructed at the locations and of the design shown on the plans or as

ordered. Materials

2.1Concrete shall be Class B conforming to Section 520.

2.2Granular backfill shall be gravel conforming to 209.2.1.2.

Construction Requirements

3.1Light pole bases shall be either precast or cast in place.

3.1.1 When precast bases are used, the hole shall be dug wide enough to allow for proper placement and compaction of the required backfill. The bases shall be placed on a prepared surface which shall provide a firm foundation. Where rock or unstable soil is encountered, the material shall be excavated 6 ” below the bottom of the base, and granular backfill placed and compacted in place of the excavated material. 3.1.2 When bases are to be cast in place, the holes shall be dug wide enough to allow the placement of concrete of the required diameter. Except when solid rock is encountered, the excavation shall be made to the full depth required on the plans. When solid rock is encountered, the bottom of the hole shall be at least 3 ft. from the top of the base and the concrete shall be firmly bonded to the rock with approved anchor rods. Forms will be required for the top of the light pole base only to a minimum distance of 12” below the finished grade of the ground at t he base. Sufficient excavation shall be made about that elevation to allow the proper placement of the forms and the proper placement and compaction of the required backfill.

3.2After the precast bases have been set, or after the removal of the forms for cast-in-place bases, granular backfill shall be

placed in the entire space outside the bases, to the level of the finished grade unless otherwise ordered. Backfill shall be made in layers not greater than 6”, with each layer thoroughly compacted. Method of Measurement

Light pole bases will be measured by the number of units installed.

4.1.1 When more than 3 ft. of conduit, measured horizontally, is required to be installed from the center of the base, the first 3 ft. will be subsidiary. Basis of Payment

The accepted quantities of light pole bases of the type required will be paid for at the Contract unit price for each complet e

in place. 5.1.1 There will be no separate payment for excavation and granular backfill. Pay items and units:

625.1Concrete Light Pole Bases, Type A Each

625.2Concrete Light Pole Bases, Type B Each

625.9Concrete Light Pole Bases, Special Type Each