Monday December 6, Session 4C: Sports Field Netting

Transcription

1 2010 Technical Meeting Monday December 6, 2010 Session 4C: Sports Field Netting

2 Princeton University Golf Course

3 Objectives Potential Uses & Benefits System Design & Layout Material Considerations Structural Design Issues Installation Methodology 2

4 Potential Uses & Benefits Primary Function is Containment Baseball & Softball Fields Lacrosse & Soccer Fields Indoor Practice/Training Facilities Golf Courses/Ranges Other Applications 3

5 Potential Uses & Benefits Benefits Greater Visibilityibilit Cleaner Look More Cost Effective for Ball Containment Will not Dent, Bend or Rust 3

6 Baseball & Softball Fields Backstops Batting Cages Outfield & Baseline Containment Dugout Shielding 4

7 Backstops or higher 4 poles system Back pole system for Greater Visibility Square vs. Diamond Mesh? 5

8 Backstops Length Site dependant Dugout or Baselines? Knee walls Concrete Masonry Rubber Belting Padding 6

9 Backstops Overhead Net Multiple Fields Primary Risk is Blind Balls From Adjacent Fields 7

10 Dugouts Player Protection Handrail Netting Overhead Systems Roof Detail 8

11 Outfield Fences Min. Height 30 AGL Create Shadow Zone Fence Details 9

12 Outfield Fences Other Considerations Foul Ball Posts Score Boards Batters Eye 10

13 Batting Cages Size: 70 Baseball, 55 Softball Access Door Impact Baffle Weighted Bottom 12

14 Batting Cages Base Turf Other Considerations Home Plate & Pitching Mound Power - Lighting 13

15 Indoor Practice Facilities Numerous Options Very Flexible Covered Cages Indoor Facility 15

16 Indoor Facilities Growing Market Segment Protect Building Exterior Sliding Partitions for Greatest Flexibility 16

17 Indoor Facilities Other Considerations Net Color White? Structure Cable attachment Points Access to lights/equipment Compliance with Fire Code 17

18 Soccer Fields Height 25 to 30 Full width of Field No poles behind Goal Even Number of Poles Consider Topographic Conditions 18

19 Golf Courses Height? Use trajectory Study Balance Coverage with Budget Option SF Cost is 50 o.c. and 50 AGL 19

20 Golf Courses Height Considerations Wood vs. Steel Poles Ability to extend height Topographic factors Ball Trajectory is Relative to Tee Line Height 20

21 Other Applications Lacrosse Field Hockey Track and Field 21

22 Other Applications Protection Parking Lots Walkways Private Property Playgrounds 22

23 Other Applications Uses Unlimited Blowing Debris - Landfills Bird/Animal i Control Building Protection Security 23

24 Material Considerations Netting Configuration Netting Hardware Support Structuret 24

25 Net (All Nets are not Equal) Material Construction UV Protection Standards d 25

26 Net Materials Nylon Polyester HMWPE Polypropylene l or Polyethylene l 26

27 Net Materials Nylon Typically used in sport Net Applications Good Abrasion Resistance Good UV Resistance (if Properly Treated) Water absorption 2% to 8% 27

28 Net Materials Polyester Typical use: Golf and Other Applications Excellent Abrasion Resistance Excellent UV Resistance Water absorption < 1% 28

29 Net Materials Polyester Typical use: Golf and Other Applications Excellent Abrasion Resistance Excellent UV Resistance Water absorption < 1% 29

30 Net Materials HMWPE Typical use: Specialty High Strength Applications Excellent Abrasion Resistance Excellent UV Resistance Water absorption < 1% 30

31 Net Materials HMWPE Trade Names Spectra or Dyneema Lighter and Stronger than Steel Higher strength with Smaller Cord Professional & College Stadiums 31

32 Net Materials Polypropylene or Polyethylene Typical use: Short term applications Good to Fair Abrasion Resistance Fair UV Resistance Water absorption: None 32

33 Net Materials Polypropylene or Polyethylene Not Recommended for Commercial Applications Low strength Sometimes Submitted as equal Product 33

34 Net Construction Two Main Methods Twisted Knotted Raschel Knotless Construction ti 34

35 Net Construction Twisted Knotted Typically used for Nylon and HMWPE Net Primary method for Sports Netting Knotted construction Prevents Runs 35

36 Net Construction Raschel Knots Typically used for Polyester Nets Primary method for Golf & Other Applications Available for Sports Applications 36

37 Net Construction Raschel Knots 2 or 4 Needle Construction Both Resistant t to Runs in Net 4 Needle results in stronger Joint 37

38 Net Construction Mesh Size Bar Length Stretch t Measure 38

39 Net Construction Mesh Size Sports Netting 1-3/4 Bar Measure (3-1/4 Stretch) Golf & Other 1 Bar Measure (2-1/2 Stretch) 39

40 Net Construction Cord Size #36 for Backstops #18 for Baselines & Outfields #36 or higher for Batting Cages 40

41 Net Construction Strength Best Measure is Mesh Breaking Strength Cord Strength th is not a Good Measure Burst Strength has no Recognized Standard 41

42 Net Construction Standards ISO 1806 Only Recommend Standard mesh breaking strength for netting ASTM D885 test method tire cords Require Test Results from Independent d Lab 42

43 Net Construction Strength Other Consideration Cord Breaks Approximately 15% Higher Bursting Strength does not Provide Good Indicator of Performance (No Standard) 43

44 Net Construction UV Protection Black Offers Greatest Protection Net Should Be: UV Treated Black Resin Dyed Urethane Bonding Treatment 44

45 Net Construction UV Protection Avoid Spun Dyed or Solution Dyed Fibers Impregnating pigment in yarns reduces strength (approximately 25%) 45

46 Net What Do I Use? Fiber: Type High Grade Nylon Construction: Twisted Knotted Mesh Size: 1-3/4 Bar Measure Twine: #36 or #18 46

47 Net Construction Rope Boarder/Riblines Transmit Load to Support Structure Construction ti 3/8 Braided Synthetic Cover with Parallel Core 3,500 lb. Breaking strength th 47

48 Net Construction Attachment Twine Use to sew net to Rope Boarder Construction ti #48 Braided Polyester Cord 375 lb. Breaking strength th Resin Dyed and Bonding Treatment 48

49 Net Construction Attachment Twine Attached using Clove & ½ Hitch 6 o.c. Things to avoid Continuous Sewn Boarders Weaver Rope Trough Net 49

50 Support Structure Attachment Clips Cable Hardware Poles 50

51 Support Structure Attachment Clips 9/32 Clips Cadmium Coated 1,140 lb. Breaking Strength 51

52 Support Structure Cable 9/16 EHS Galvanized Strand 1x7Construction 11,200 lb. Breaking Strength Aircraft cable & Coated Wire not Recommended 52

53 Support Structure Cable 5/16 Strandvise Terminations Always use Thimble Eye or Clevis Connections Avoid: Turnbuckles Cable Clamps 53

54 Support Structure Hardware Use Pole Line Utility Hardware Galvanized Finish ANSI, ASTM & NEMA Standards Bolts 5/8 13,550 lb. 54

55 Support Structure Poles Design to Take Loading Space to Provide Optimum Site Lines Avoid use of Light Poles 55

56 Types of Poles Steel More Finished Look Greater Strength & Design Flexibility Higher Cost More Maintenance 56

57 Types of Poles Steel Grades ASTM A500 ASTM A252 APL-5L 57

58 Types of Poles Steel Grades ASTM A500 ASTM A252 APL-5L 58

59 Types of Poles Steel Grades Avoid High Tensile Strength (80 ksi & higher) West Country Oil 59

60 Types of Poles Finishes High Quality Primer Galvanization UV Resistant & Flexible Finish Coat Field apply Final Coat 60

61 Types of Poles Wood Most Cost Effective Requires Guying Less Maintenance Long Life Span 61

62 Types of Poles Concrete Less Flexibility after Fabrication Cost Plant Location Weight 62

63 Types of Poles Others Tapered Steel Poles Stadium Structure Light poles 63

64 Structural Design ASTM 7-05 Design standard (2010 edition has been released) Be careful of other standards AASHTO LTS-4 Highway signs, lights & traffic signals 64

65 Structural Design Wind Load Chapter 6 Wind Speed per Fig 6-1 Exposure per surface roughness & local Code Exposure types: B, C & D 65

66 Structural Design Snow & Ice loads Chapters 7 & 10 Generally Increase Cost Consider not Designing i For Snow & Ice 66

67 Structural Design Foundations Geotechnical Report IBC Tables 67

68 Structural Design Foundations Direct Embedment Most Cost Effective 3,000 psi Concrete for Steel Poles Compacted Fill or 57 Stone for Other Poles oes 68

69 Installation Methods Poles Cable & Hardware Net 69

70 Installation Methods Poles Install Plumb and True One complete Topcoat of Paint in Field 70

71 Installation Methods Cable & Hardware Avoid Turnbuckles & and Cable Clamps Standvise is best method for terminations Use Appropriate Hardware for terminations Avoid off Axis loads on Hardware 71

72 Installation Methods Net Consider Individual Panels Clearance from Trees/Obstacles Clip cable to Rope Boarder Only Panel Size 2,500 SF Unsupported (max 5,000 sf) 72

73 Installation Methods Net Avoid Field Fabrication Sew Bottom Boarder at Back Stops Should not Bellow Minimize Wrinkles 73

74 Installation Methods Net is a good compliment to Chainlink Works well Above Chainlink Fences Systems Should not be Mixed Separate Support Structures are Required 74

75 Question & Answer Tom Pankey Jr (205)