**November 21, 1997**

Contract \# **TW-0928**

SPECIAL SPECIFICATION

SECTION 02444-S

[CHAIN LINK FENCES AND GATES]{.underline}

Page

[PART 1 - GENERAL]{.underline}

1.01 Description Of Work 2

1.02 Type Fence 2

1.03 Relocation of Existing Fence 2

1.04 Submittals 3

1.04 Delivery Storage and Handling 3

PART 2 - PRODUCTS

2.01 Materials 4

PART 3 - EXECUTION

3.01 Site Preparation 6

3.02 Erection 6

3.03 Bolts and Hardware 7

3.04 Painting 7

3.05 Clearance 7

**November 21, 1997**

Contract \# AQ-1486A

SPECIAL SPECIFICATION

SECTION 02444-S

[CHAIN LINK FENCES AND GATES]{.underline}

# PART 1 - GENERAL

## 1.01 [DESCRIPTION OF WORK]{.underline}

##  Chain link fence material shall be produced and installed by methods recognized as good commercial practices in accordance with the Chain Link Fence Manufacturers Institute.

## 1.02 [TYPE FENCE]{.underline}. 

##  A. Chain link fencing shall conform to the requirements stipulated herein. Chain link fencing shall be either buried perimeter fencing or standard fencing as indicated in the contract.

B. [Security (Buried Perimeter) Fencing]{.underline} shall be a fence
with 8-feet-0-inches of chain link fabric and top and bottom rails. The
bottom rail and fabric shall be buried 6 inches below grade. Place three
strands of barbed wire on extension arms for a total fence height of
8-feet-6-inches above grade.

C. [Standard Fencing]{.underline} shall be a fence with 8-feet-0-inches
of chain link fabric and top and bottom rails. The bottom rail shall be
within two inches above the finish grade. Place three strands of barbed
wire on extension arms for a total fence height of 9-feet-0-inches above
grade.

D. As a general rule, buried perimeter fencing will be used on perimeter
fences placed over soil. Standard fencing will be used on non-perimeter
fences and for perimeter fences placed over a concrete or asphalt paved
surface. Exceptions to this rule will be indicated in the contract.

E. [Interior Fencing and Gates]{.underline} shall be a fence with 8
feet - 0 inches of chain link fabric and top and bottom rails. The
bottom rail shall be within two inches of the floor. The gates will be
of a similar construction with cross bracing as required and a hasp for
locking.

## 1.02 [RELOCATION OF EXISTING FENCE]{.underline}

Any existing fence indicated on the drawings to be removed and relocated
shall be taken down, have concrete broken off the posts, and be
reinstalled in accordance with these specifications. At no additional
cost to Sandia, the contractor may keep the removed posts and install
new posts. Splicing posts by welding is not permitted.

## 1.04 [SUBMITTALS]{.underline}

##  A. [General:]{.underline} Submit the following in accordance with the provisions of Division 1, Section 01300-S "Descriptive Submittals"

B. [Product Data:]{.underline} Submit complete product or manufacturer's
specifications and installation instructions for each product used at
the interior chain link fences and gates

C. [Shop Drawings:]{.underline} Submit shop drawings layout and erection
of the interior chain link fencing and gates.

## 1.05 [DELIVERY STORAGE AND HANDLING]{.underline} 

##  A. [Fence Removal for Storage]{.underline}. Fence material shall be stored only when specifically noted in the contract. Any existing fence to be removed and stored for future use shall be taken down and have concrete broken off posts. Posts shall be bundled and tied with wire or strapping tape. Rails shall be bundled in like manner. Fabric shall be rolled, tied and tagged showing length. Separate sections of fabric and wire shall be rolled separately and tagged. All hardware (bolts, nuts, hinges, etc.) that is reusable shall be boxed and tagged as \"Fence Hardware.\" Gates shall remain intact. Material shall be delivered to a warehouse as directed by the INSPECTOR.

## B. Unless specifically directed by the engineer, all barbed wire shall be taken to salvage. (Reusing barbed wire is dangerous due to its tendency to snap when repulled.)

C. [Fence Removal for Salvage]{.underline}. Any existing fence to be
removed and turned into salvage shall be handled in the same manner as
noted in the previous paragraph except that concrete may be left on the
poles.

# PART 2 - PRODUCTS

## 2.01 [MATERIALS]{.underline} 

##  A. Concrete shall be at least 2500 psi.

##  B. [Fencing Materials]{.underline}. Posts, gate frames, braces, rails, stretcher bars, truss rods and tension wire shall be of steel. Gate hinges, post caps, barbed wire extension arms, stretcher bar bands, bolts, hardware, and other parts shall be of steel, malleable iron, ductile iron, except that post tops, rail ends, ties and clips may be of aluminum. All fencing, pipe, fabric, and accessories shall conform to the specifications described in the \"Product Manual\" published by the Chain Link Fence Manufacturers Institute unless further restricted by this section. The contractor shall submit shop and erection drawings for all components of the chain link fence.

C. [Fabric]{.underline}: Fabric shall be No. 11 gauge copper-bearing
open-hearth steel wire, woven in a 2-inch mesh, and heavily galvanized
by the hot-dip process after weaving.

D. [Pipe]{.underline}: All posts, braces, rails, and gate framing
members shall be coated with zinc by the hot-dip process after
fabrication. The strip steel used in the manufacture of the pipe shall
conform to either ASTM A-120 (Schedule 40) or ASTM A-569 (SS 40 by
Allied Tube and Conduit Corp. or equal). Pipe conforming to ASTM A-120
shall receive not less than 1.8 ounces per square foot of zinc coating.
Pipe conforming to ASTM A-569 shall be triple coated with a minimum of
0.9 ounces per square foot of zinc, 15 micrograms per square inch of
chromate, and 0.3 mils of polyurethane finish. Pipe shall be straight or
have an installed deflection not greater than 1/2\" per span or post.

E. [Line Posts]{.underline}: All line posts shall be nominal 2-inch,
2.375 inch O.D. steel pipe.

F. [Terminal Posts]{.underline}: End posts shall be nominal 2-1/2 inch,
2.875 O.D. steel pipe.

G. [Top Rail]{.underline}: All top rails shall be nominal 1-1/4 inch,
1.660 inch O.D. steel pipe. Top rails shall be provided with expansion
couplings and shall be securely fastened to gate and terminal posts by
means of suitable hot-dipped galvanized connections.

H. [Bottom Rail]{.underline}: All bottom rails shall be nominal 1-1/4
inch, 1.660 inch O.D. pipe.

I. [Bracing]{.underline}: Rails shall be nominal 1-1/4 inch, 1.660 inch
O.D. galvanized steel pipe with adjustable truss braces 3/8\" in dia.
and all fittings hot-dipped galvanized.

J. [Barbed Wire Support Arms]{.underline}: All posts shall be provided
with pressed copper-bearing galvanized steel extension arms. All end
posts shall be provided with heavy malleable iron extension arms. All
extension arms shall be heavily coated with zinc by the hot-dip process.
Each extension arm shall carry three strands of 12-1/2 GA, 4 PT, Class
III barbed wire at an angle of 45 degrees, the upper strand 12 inches
out from the fence line and 12 inches above the top of the fabric. Arms
shall be the type that allow top rail to pass through their bases to
form a continuous brace. Barbed wire arms shall be of sufficient
strength to withstand a weight of 250 pounds applied at the outer strand
of barbed wire.

K. [Barbed Wire]{.underline}: Barbed wire shall be of the four-point
pattern, composed of two strands of No. 12-1/2 gauge copper-bearing
steel wire, with large hard temper barbs spaced 5 inches apart, and
shall be heavily galvanized by the hot-dip process.

L. [Tension Bars]{.underline} shall be 3/16 x 3/4-inch hot-dipped
galvanized.

M. [Fabric Ties]{.underline} shall be No. 12 gauge galvanized steel or
aluminum wire.

N. [Gates]{.underline}: Gate frames shall be nominal 1-1/2 inch, 1.900
inch O.D. galvanized high carbon-welded steel tubing with internal
bracing of nominal 1-1/4 inch, 1.660 inch O.D., galvanized high
carbon-steel tubing welded at all joints to provide rigid water-tight
construction. Gate fabric shall match the line fence fabric. Gates shall
be 8-feet high with heavy malleable iron extension arms as previously
described. Swing gates shall be furnished with pivot-type hinges, center
stop, and hold open devices. Gates shall provide clear openings as shown
on the drawings. If requested on the submittal list, the contractor
shall submit shop and erection drawings on the gates, hardware, type of
hangers, spacing, and all other details required for a complete
installation. Latches are required only if called for in the contract.

O. [Gate Posts:]{.underline} For gates over 4 feet wide, gate posts
shall be nominal 3-1/2 inch, 4.00 inch O.D. galvanized steel pipe. The
posts shall be provided with heavy malleable iron extension arms as
previously described. For gates 4-feet wide and smaller, gate posts may
be nominal 2-1/2 inch, 2.875 inch O.D.

P. [At interior chain link partitions]{.underline}, provide a base plate
with minimum of four 1/2" diameter expansion anchors for each post.
Refer to structural drawings, General Notes, Sheet 105638/A1, for
expansion anchor requirements.

Q. [Substitutions]{.underline}: Only under provisions of section 01600.

PART 3 - EXECUTION

## 3.01 [SITE PREPARATION]{.underline}: 

##  A. Blade off all fence lines to finish grade before construction of fences.

## 3.02 [ERECTION]{.underline}: 

##  A. The fence erection, including all connections, shall be made in accordance with manufacturer\'s directions and the \"Product Manual\" published by the Chain Link Manufacturers Institute.

##  B. [Concrete Placement]{.underline}: Posts and gate hold open devices shall be placed in concrete. The contractor shall insure that the fresh concrete has sufficiently cured prior to pulling the fabric.

## C. [Fabric]{.underline} shall be stretched taut enough to resist a 6-inch deflection laterally, top or bottom, when force is exerted with the hand. Fabric shall be attached to and supported by terminal and gate posts by means of 3/16 x 3/4 inch hot-dipped galvanized tension bars. Fabric shall be fastened to line posts and to the top and bottom rails by means of tie wire spaced approximately two feet apart.

## D. [Top Rail]{.underline} shall pass through the extension arms to form a continuous brace from end to end of each stretch of fence.

## E. [Bottom Rail]{.underline} shall be installed in accordance with manufacturer\'s directions using couplings.

## F. [Bracing]{.underline}: All end and corner posts, unless otherwise shown, shall be suitably braced with pipe set in horizontal position, with adjustable truss braces between terminal and first line posts, complete with all fittings. Terminal posts shall be braced laterally in an approved manner.

## G. [Barbed Wire]{.underline}: Install three strands on the extension arms at the top of the fence and over gates.

## H. [Post Spacing and Setting]{.underline}: All posts shall be spaced in the line of the fence not to exceed 10-foot centers. All posts shall be set in concrete foundations to a depth of not less than 36 inches.

##  Top of concrete for buried fabric shall be 6-inches below finish grade. Concrete foundations shall be circular in horizontal section, not less than 10-inches in diameter for line posts, and with a diameter not less than the outside diameter of the post plus 9 inches for each gate and terminal post.

## 3.03 [BOLTS AND HARDWARE]{.underline}

A. All screws, nuts, bolts, bars, wire mesh, hinges and hinge pins shall
be securely fastened to preclude surreptitious removal and assure visual
evidence of tampering.

B. Hardware accessible from outside the area shall be restrained by
peening, brazing, or spot welding to preclude removal.

1\. Exceptions: Carriage bolts with round head need not be restrained
when used to connect top or bottom rail, latches or center stop.
Carriage bolts need not be restrained when used on hardware when the nut
is not accessible from the outside.

2\. Exceptions: Bolts and hardware on fence other than perimeter
security fence shall not be restrained unless directed otherwise.

## 3.04 [PAINTING]{.underline}

##  Surfaces that have been cut, filed, or where the galvanized coating has been broken shall be coated with an anti-corrosive aluminum paint or suitable substitute to prevent corrosion.

## 3.05 [CLEARANCE]{.underline}:

A. The bottom rail shall be installed so that it is not over 2 inches
above grade at any point. (Standard fence only)

B. Provide suitable closure at irregularities in grade, such as curbs or
ditches.

C. Vertical posts shall not exceed 6 inches open space to the adjacent
post or solid structure.

D. Gates in the closed position shall have vertical and horizontal
clearances not greater than 6 inches.

END OF SECTION