|
|
Specifications
|
|
|
|
|
|
|
|
|
|
|
|
| Part
1 - General |
|
|
Part
3 - Execution |
|
|
|
|
|
|
|
|
|
|
|
| 1.1
Work Included |
|
|
3.1
Inspection |
|
|
|
The
scope of the work includes labor, materials,
equipment and performance of all work required for
installation of Poly-Grate II as suggested by
manufacturer’s drawings and installation procedures. |
|
Proper
site preparation and ongoing maintenance will
determine performance. |
|
|
|
|
|
|
|
|
|
3.2
Surface Conditions |
|
|
|
|
Examine
concrete ledge, and/or existing tree pit to
receive grate. Correct condition to comply with
manufacturer’s recommended installation procedure. |
|
|
|
|
|
|
|
|
|
| 1.2
Work by Others |
|
|
|
|
|
|
|
|
Openings
to receive grates are to be provided by
others in accordance with instructions of tree grate
manufacturer and are indicated on drawings and
provisions of the specification. |
|
|
|
|
3.3
Installation |
|
|
|
|
A.
Opening to Receive Grate |
|
|
|
|
|
1.
Concrete Ledge Supported - New Installation
(figure 3.3A1) Concrete ledge shall be cast in size
and configuration of specified tree grate model plus
3/8” expansion allotment. Ledge shall be 2 inches
below concrete or tiled surface and extend inward
2 to 3 inches. Ledge must be level and free of bulges
and slag. |
|
|
|
|
|
|
|
|
|
|
| Part
2 - Product |
|
|
|
|
|
|
|
2.1
Tree Grates |
|
|
|
|
|
|
|
A.
Manufacturer |
|
|
|
|
|
|
Grates
shall be Poly-Grate II, plastic tree grates
as manufactured by us. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.
Angle Iron Frame Supported - Retro-fit
Installation (figure 3.3A2) When pouring sidewalk,
prepare smooth edges to accept lengths of 2” 90º
angle iron cut to specifications of grate size minus
5 inches (for 48” grate cut angle iron to 43”;
for
60” grate cut angle iron to 55”). Sidewalk
preparation should allow 3/8” additional length
per side to provide for grate expansion. Attach angle
iron to sides of poured surface with Tap-Con
screws or other approved concrete fastener.
The angle iron support ledge should be placed 2”
below the surface of the concrete. |
|
|
B.
Material |
|
|
|
|
|
|
|
|
|
Grates
shall be of high-density polyethylene resins
conforming to ASTM D-638. |
|
|
|
|
C.
Design |
|
|
|
|
|
|
Grate
pattern shall comply with A.D.A. requirements
for equal access. Color, size, and configuration shall
be specified by owner/architect. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
D.
Finish |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
B.
Support and Litter Prevention |
|
|
|
Grates
shall be manufactured true to pattern, of
uniform quality and size, and free from defects.
Surface shall be smooth; free of sharp edges. |
|
|
|
|
|
|
Fill
space from bottom of tree pit flush to bottom
of tree grate with pea rock, crushed shale or similar
aggregate. |
|
|
|
|
|
|
|
|
|
|
| 2.2
Hardware |
|
|
|
|
|
|
|
|
|
|
|
|
C.
Join Grate Halves |
|
|
|
Fasteners
(included) |
|
|
|
|
|
|
Bring
tree grate halves together around a tree at a
height that allows easy access to underside. Join
section at pre-formed holes using tamper-resistant
bolt package provided by manufacturer, or approved
equal. Lower grate into place. |
|
|
|
Grate
halves shall be joined together with tamper-
resistant bolt package as provided by us. Package
to consist of (6) each #16 3/8” x 1-1/4” button
head
socket-cap screw, stainless; #16 3/8” Tuff Nut,
brass; and (12) each 3/8” USS Flat washer, zinc. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TEST
DATA
|
|
|
|
|
|
|
|
|
|
|
|
|
ASTM Test |
Units |
Typical Values |
|
Resin Properties: |
|
|
|
|
Density |
D-1505 |
g/cc |
0.957 |
|
Melt Index |
D-1238 |
g/10 min |
7 |
|
Molded Properties: |
|
|
Tensile Modulus |
|
|
(1% Secant) |
D-638 |
psi |
166000 |
|
Tensile at Yield |
D-638 |
psi |
4300 |
|
Elongation at Break |
D-638 |
% |
1400 |
|
Flexural Modulus |
D-790 |
psi |
194000 |
|
