Attach_2_Sabbaday_Guiderail_Final_939_Specification_03-24-17.doc

Section 939— Guiderail Systems Description

939.00.01 This work consists of construction of guiderail systems, including excavation, embankment, cast-in-place concrete, reinforcing steel, welded wire mesh, steel connectors, fasteners, timber posts and railing. Construction of guiderail systems may be covered by one or more of the following subsections:

939.10.

Guiderail Posts and Bases 939.20.

Guiderail Rails and Inserts 939.30.

Guiderail Gates and Inserts Materials

939.00.02 Materials. Conform to the following Sections and Subsections:

Structure Excavation and Backfill

FP-14, Section 209

Reinforcing Steel

FP-14, Section 554

Steel Structures

FP-14, Section

Timber Structures

FP-14, Section

Concrete

FP-14, Section 601

Material for Timber Structures

Construction

939.00.03 General. Construct Guiderail Systems at locations SHOWN ON THE PLANS or DESIGNATED ON THE GROUND.

939.00.04 Excavation. Excavate neatly as required to evaluate and install appropriate post base type. Perform excavation in accordance with the requirements of FP-14, Section 209 and as SHOWN ON THE PLANS.

939.00.05 Backfill. Backfill and compact with suitable material in accordance with the requirements of FP-14, Section 209 and as SHOWN ON THE PLANS.

939.00.06 Reinforced Concrete. Install reinforcing in accordance with the requirements of FP-14, Section 554 and as SHOWN ON THE PLANS. Place and protect concrete in accordance with the requirements of FP-14, Section 601 and as SHOWN ON THE PLANS.

939.00.07 Steel. Install steel components and connectors in accordance with the requirements of FP-14, Section 555 and as SHOWN ON THE PLANS. Galvanize all steel in accordance with the requirements of Section 995.03.

939.00.08 Fasteners. Install steel fasteners in accordance with the requirements of Section 995 and as SHOWN ON THE PLANS. Galvanize all fasteners in accordance with the requirements of Section 995.03.

939.00.09 Log Rails and Posts. Install timber in accordance with the requirements of FP-14, Section 557 and 995. Use logs greater than or equal to 4 inches in diameter for rails and 6 inches for posts. Fasten each rail to posts as SHOWN ON THE PLANS. Pre-drill holes for fasteners to prevent splitting. Pressure treat all timber components in accordance with the requirements of Section 995.04.

939.00.10 Welded Wire Mesh. Weld the mesh from 12.5 gage galvanized steel wire conforming to ASTM A 641, class 3. Use wire with a minimum tensile strength of 60,000 pounds per square inch when tested according to AASHTO T 244. The galvanized coating shall be applied after mesh fabrication. Make the mesh openings with a maximum vertical dimension less than 4 inches and maximum horizontal dimension of less than 2 inches.

(a) Polyvinyl chloride coated mesh. Use either a fusion bonded or extruded coating to coat the galvanized mesh.

Make the coating at least 0.125 inch thick. Make the color black and conform to the following:

(1) For polyvinyl coating meet:

· Specific gravity, ASTM D 792

1.20 to 1.40

· Tensile strength, ASTM D 638

2,300 pounds per square inch min.

· Modulus of elasticity, ASTM D 638 2,000 pounds per square inch min. at 100 strain

· Hardness — shore "A", ASTM D 2240 75 min.

· Brittleness temperature, ASTM D 746 16 ºF max.

· Abrasion resistance, ASTM D 1242, 12% max.

method B at 200 cycles, mass loss

CSI-A abrader tape, 80 grit

· Salt spray (ASTM B 117) and

No visual effect ultraviolet light exposure

(c) ∆< 6%

(ASTM D 1499 and G 23 using

(d) ∆< 25% apparatus type E and 145 ºF)

(e) ∆< 25% for 3000 hours

(h) ∆< 10%

· Mandrel bend, 360º bend at 0 ºF

No breaks or around a mandrel 10 times the wire cracks in diameter coating

939.00.11 Finish guiderail systems smooth and free from splinters and sharp projections.

Measurement

939.00.12 Measure the Section 939 items listed in the bid schedule according to section 906.

Payment

939.00.13 The accepted quantities will be paid at the contract price per unit of measurement for the Section 939 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 906.04.

939.10. — Guiderail Posts and Bases Description

939.10.01 This work consists of construction of guiderail posts and bases including excavation, embankment, cast-in-place concrete, reinforcing steel, steel connectors, fasteners and timber posts.

Construction

939.10.02 Construct guiderail posts and bases as required under construction section 939.00 and/or as SHOWN ON THE PLANS.

939.20. — Guiderail Rails and Inserts Description

939.20.01 This work consists of installation of guiderail rails and inserts, including welded wire mesh, steel connectors, fasteners, and timber railing.

Construction

939.20.02 Install guiderail rails and inserts as required under construction section 939.00 and/or as SHOWN ON THE PLANS.

939.30. — Guiderail Gates and Inserts Description

939.20.01 This work consists of installation of the removable gates, including welded wire mesh, fasteners, and timber components.

Construction

939.20.02 Install guiderail gates and inserts as required under construction section 939.00 and/or as SHOWN ON THE PLANS.

03/24/2017

Sabbaday Falls Safety and Guiderail Replacement-2