Chain Link Baseball Backstop

SECTION 32 31 13.33

Chain Link Baseball Backstop fence is of the same specification as Master Halco industrial chain link fence specification 32 31 13 using heavier gauge mesh, having a specific height, layout, canopy overhang design and some specific installation requirements. Chain link backstops carry the MasterFormat designation 32 31 13.33. To develop a chain link baseball backstop fence specification in accordance with Master Halco Baseball Backstop Drawings 16-1110 sheet 1 and 2 revise the selected chain link fence specification 32 31 13 following the step by step instructions below.

Step #1 Select the backstop design layout for the application. The backstop layout can be adjusted to fit the application by reducing the back dimension from 20’ 0” down to 10’ 0” or increasing it up to 30’ 0”. Maintain the maximum post spacing of 10’ 0” on center. Most applications are per the standard drawing 16-1110 using the 20’ 0” back dimension.

Step #2 Select the Master Halco 32 31 13 chain link specification system. [galvanized chain link fabric with galvanized framework] [aluminized chain link fabric with galvanized framework], [Galfan™, zinc 5% aluminum-mischmetal alloy coated chain link fabric with galvanized framework], [PVC coated chain link fabric with galvanized framework], [PVC coated chain link fabric with PVC color coated framework].

Step #3 Section 2.02 Chain link fabric; specify 2” mesh 6 gauge chain link fabric for the bottom 12’ 0” height. [the heavier, stronger 6 gauge is required to reduce fabric damage from foul balls] Specify 2” 9 gauge chain link fabric for the upper side panels and top canopy. Insert the fabric selvage as K &K, knuckled top and bottom.

Step #4 Section 2.03 Steel fence framework, insert the steel pipe framework to be specified, [Type I: ASTM F1043 Group IA, ASTM F1083 schedule 40 pipe] [Type 2: ASTM F1043 Group IC pipe] The minimum post pipe size for all posts per the drawing is 4.00” O.D. Applications in areas that experience wind loads over 75 MPH may require reduced post spacing or a larger post diameter, consult the Chain Link Fence Manufacturers Institute’s document, WLG2445, “Chain Link Fence Wind Load Guide for the Selection of Line Posts and Line post Spacing” at www.chainlinkinfo.org or www.wheatland.com. The bottom and mid rail shall be 1.660” O.D. and the top rail and canopy pipe framing shall be 1.900” OD, rails to be of the same specification as the posts.

Step #5 Section 2.04 Brace and tension bands; revise the brace and tension band material specification from 12 gauge by 3/4” to 3/8” (9.52 mm) thick by 1” (25 mm) galvanized steel bands. Section 2.04 Truss rod assembly; revise by deleting the truss rod assembly text as there are no truss rod assemblies required for the backstop design and replace it with, “Canopy support truss assembly: Galvanized steel truss rod assembly consisting of minimum ½” (12.7mm) diameter truss rod with malleable or pressed steel turnbuckle.”

1 Step #6 Section 3.02 framework installation; Add to 3.02 A, “Layout and install backstop fence in accordance with Master Halco baseball backstop drawing 16-1110 sheets 1 and 2.” Paragraph 3.02 D, the minimum concrete footing size per ASTM F567, 16” diameter by 48” deep, depending on soil conditions. Paragraph 3.02 I and 3.02 J add the following; “rail ends to be secured to the pipe rail by field drilling and bolting per drawing 16-1110 sheet 2.” Insert a new paragraph 3.02 K or L depending on the system specification, “Canopy truss assembly: The ½” diameter canopy truss assemblies shall be secured to the post and canopy frame using brace bands.”

Step #7 Paragraph 3.04 A, fabric installation: Install fabric on the inside of the backstop. Revise tension band spacing to maximum of 12” (304.8 mm) on center. Install fabric so that it is maximum 1” (25.4 mm) above finish grade.” Paragraph 3.04 B, delete existing text and replace with, “Secure fabric to line posts and rails using wire ties 12” (304.8 mm) on center. Tie wire shall be secured to the fabric by wrapping it two 360 degree turns around the chain link wire pickets. Cut off any excess wire and bend back so as not to protrude so as to avoid injury if a pedestrian may come in contact with the fence.”

END OF INSTRUCTION