- 756 - SECTION 917 -- RECONSTRUCTION OF MANHOLES AND ADJUSTING MANHOLES TO GRADE
917.01 Description
1.The Contractor shall adjust th e manhole elevations or reconstruct the manhole as described in the contract.
2.Adjusting a manhole elevation is defined as lowering the top 6 inches (150 mm) or less or raising t he top not more than 1 foot (300 mm).
3.Reconstructing a manhole is defined as lowering the top more than 6 inches (150 mm) or raising the top by more than 1 foot (300 mm).
917.02 Material Requirements
Brick mortar shall be 1 part cement, 2 parts sand, and water as necessary to insure brick can be set at designed spacing.
917.03 Construction Methods
1.The Contractor shall:
a.Remove and replace the necessary surfacing to allow adjustment of the manhole.
b.Remove the castings and adj ust the tops of the manholes by removing or adding concrete or brick, as the case may be.
c.Reset the frames and covers. 2. The work of reconstructing m anholes or adjusting manholes to grade shall be performed in accordance with the requirements of Subsection
916.03 when concrete is used.
3.Bricks shall be approved by the Engineer. The bricks shall be bonded in mortar. All brick must be wetted before being placed. All joints shall be completely filled with mortar and shall be 3/8 inch (9 mm) thick.
4.The Contractor shall provide and set all cast iron covers, rings, frames, flanges, and other items as described in the contract.
917.04 Method of Measurement
1.Adjusting manholes to grade will be measured by the each. 2. Reconstructing manholes will be measured by the each.
3.Cast iron is measured by the pound (kilogram).
917.05 Basis of Payment
1.P a y I t e m P a y U n i t Reconstruct Manhole Each (ea) Adjust Manhole to Grade Each (ea) Reconstruct Manhole _____ Each (ea) Cast Iron _____ Pound (lb) [ K i l o g r a m ( K g ) ]
2.Payment is full compensation for all work described in this Section. - 757 - SECTION 918 -- ABANDONING MANHOLES, INLETS, AND JUNCTION BOXES
918.01 Description
1.This work consists of demolishing manholes, inlets, and junction boxes and backfilling the area as described in the contract.
918.02 Material Requirements
1.Granular material in this Section is defined as material having 90% or more retained on the No. 200 (75 µm) sieve.
2.The backfill materials shall be compacted to the stiffness requirements for Class III embankment as described in S ubsection 205.03, Paragraph 14.b.(3).
918.03 Construction Methods
1.The Contractor shall remove the manhole cover and the top cast iron flange.
2.The Contractor shall demolish the manhole, inlet, or junction box walls to at least 40 inches (1 m) below the finished grade elevation.
3.The Contractor shall plug all opening with concrete pipe plugs. 4. The Contractor shall demolish th e floor of the structure. No piece shall be longer than 40 inches (1 m) in any dimension.
5.a. The Contractor shall fill the opening created by the demolition with granular material to within 40 inches (1 m) of the finished grade elevation.
b.The Contractor shall fill the remaining hole with soil and compact to the same stiff ness as surrounding soils.
6.Materials which are removed and not salvaged shall be disposed of in accordance with requirements in Section 203.
918.04 Method of Measurement
1."Abandon Manhole", "Abandon Inlet", and "Abandon Junction Box" are measured by the each.
918.05 Basis of Payment
1.P a y I t e m P a y U n i t Abandon Manhole Each (ea) Abandon Inlet Each (ea) Abandon Junction Box Each (ea)
2.Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 790–790 of 1,048.