Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
ITEM 604.46 - REPLACE CASTING
A. SCOPE
This work consists of replacing triangular, small diameter, and broken manhole frames and
covers, and catch basin frames and grates as shown on the drawings or as directed by the
Engineer. Any repair needed to the existing structure within the 12 inches below the bottom of
the casting shall be included and performed under this item. Any further repair needed to the
existing structure shall be performed under Item 604.4.
B. MATERIALS AND CONSTRUCTION
This item shall include all labor, materials (except for frames and covers), equipment, and
transportation necessary to replace castings, and to set them at new overlay elevation. Frames,
covers, and grates will be provided by the City of Nashua at 9 Stadium Drive in Nashua. This
item is to include removal of existing frame and cover, transport to City of Nashua drop off site
(Four Hills Landfill at 830 West Hollis St in Nashua), transport new frames and covers from 9
Stadium Dr in Nashua to work area, placement and all excavation and pavement restoration
work,
Mortar shall comply with NHDOT Section 707. Brick shall comply with NHDOT 604.2.4 and be
AASHTO M91 Grade SS brick. Contractor shall provide the City with material slips certifying
brick meets requirements.
Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a thick ring of mortar extending to
the outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.
All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.
Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction.
C. MEASUREMENT AND PAYMENT
Payment for replacing existing castings shall be at the contract unit price specified for each. All
castings regardless of size will be paid for as one (1) each. The removed castings will remain the
property of the City of Nashua.
