Presentation on theme: "Session 6 KY Type 4A End Treatment See “Shop Drawings” for Types FLEAT-SP Slide 6 by Road Systems SRT-27 Slide 49 by Trinity The KY Type 4A End Treatment."— Presentation transcript:
1Session 6 KY Type 4A End Treatment See “Shop Drawings” for Types FLEAT-SP Slide 6 by Road Systems SRT-27 Slide 49 by TrinityThe KY Type 4A End Treatment is represented by the FLEAT-SP by Road Systems and the SRT-27 by Trinity Highway Products.The Type 4A is a flared end treatment.
2Standard Drawing RBR-035 Guardrail End Treatment Type 4A MUST use App Standard Drawing RBR-035 Guardrail End Treatment Type 4A MUST use App. Shop DrawingsKY’s Generic Standard Drawing for the Type 4A End Treatment– not much info – and still shows wooden post. You need Approved Shop Drawing and Manufacture’s Installation or Assembly Instructions to Install or Inspect
3RBR-035 -KYTC Pay Limits for the Type 4A is 37'-6” even though the FLEAT Shop Drawing says 12’ 6”? The FLEAT-SP Shop Drawing (bottom drawing) and Manufactures Assembly Instructions Show the End Terminal “End of Payment For Installation” to only be 12’ 6”. That is all the manufactures ships. However on Standard Drawing RBR-035 (currently a Sepia Drawing until Jan 2012) the KYTC Pay limit is 37’ 6” in order for the SRT and the FLEAT-SP to be equal in length for bid alternates (top Drawing). The remaining 25’ for the FLEAT-SP will be Standard Post with 8” Offset Blocks. At Post #7 the contractor will begin with the KY Standard 6” Offset Block.
4Installation Instructions for Proprietary Guard Rail End Terminals This Std Draw Note appears on each Proprietary End Treatment used in KY - “The Manufacturer SHALL furnish two (2) sets of shop plans to the contractor with each installation”Each Proprietary End Treatment “see shop drawings”Added to Sect of 2012 Std Specs: “Proprietary end treatments SHALL be installed according to the manufacturer’s assembly or installation instructions”SHOULD NOT LET THE CONTRACTOR BEGIN INSTALLATION BEFORE SUPPLYING YOU WITH THESE SHOP PLANS & INSTALLATION INSTRUCTIONS – Both you and the contractor need these documents to properly do your jobs of installing and inspection propriety guardrail end terminalsCLICKWhat dose this statement mean??This Note has been on proprietary guardrail end treatment Standard Drawings for many years. How many of you have seen this note and required the Shop Plans or Drawings?CLICK – this note has been added - CLICKYou should require this before allowing installation to begin. Probably all you need to do is require it once and the contractor will have the required information from that date forward CLICK
5How do you know which version of a Proprietary Guardrail End Treatment KY is Using? Go to the KYTC Div of Design Home PageOn the right click on Standard DrawingsBrings up:Standard DrawingsActive Sepia ListApproved Shop Drawings - ClickThe drawings show the version 350, SP, 27 etc.Good general information on the Shop Drawing
6Approved Shop Drawings Type 4A Click for Alternate 1 or 2
7Approved Shop Drawing Type 4A Alternate - FLEAT-SP
8Type 4A End Treatment FLEAT-SP (Std Post) Installation http://roadsystems.com/fleat.html Flared Energy Absorbing Terminal – Standard Post
9FLEAT & SKT-SP Road Systems http://roadsystems SKT-SP & FLEAT-SPA very easy to follow“Assembly Instructions”With Drawings and PhotosAs I noted in the Type 1Discussion we will cover boththe Type 1 SKT-SP andthe Type 4A FLEAT-SPInstallation together with theType 4A Discussion
10FLEAT FLared Energy Absorbing Terminal Absorbs Energy by Kinking & Extruding the Rail Thru Impact HeadFrom The FLEAT combines the superior performance of the energy absorbing tangent terminals with the advantage of flared terminals in reducing nuisance impacts. During head-on impacts, the FLEAT head slides over the W-beam guardrail. The rail is sequentially kinked or bent as it moves through the head. The kinked guardrail exits the head safely and the vehicle is brought to a controlled stop. When impacted along the side within the length-of-need, the FLEAT functions like guardrail. The errant vehicle is safely redirected back toward its original travel path.
11The FLEAT Extrudes the Rail Toward Traffic in a Tight Roll Thru Impact Head and Feeded Chute Because of the dynamics of extruding the guardrail and the guardrail being flared, when attempting to both flare and extrude the rail away from traffic the rail would kink. To get the system to work, Road Systems had to extrude the rail toward traffic to keep the rail from kinking. With flaring in one direction and extruding the rail in the opposite direction Road Systems was able to develop a TL-3 Flared Energy Absorbing Terminal (FLEAT-SP). Due to the tight roll of the extruded rail, there have not been problems with the rail extruding out into traffic.
12Type 4A FLEAT-SP http://roadsystems.com/fleat.html FLEAT-SP (FLared Energy Absorbing Terminal – Standard Post System) is an energy-absorbing flared terminal -NCHRP 350 APPROVEDFlare is straight and the offset is variable between 2'-6" and 4'-0” - KY only uses 4’No strut, but does have a soil plate at Post 1POST 3-6 STD GR POST W6x9 with 8” offset blocks.
13FLEAT Variable Offset KY = 48” The FLEAT Variable Offset allows for an Offset of 30-48” – KY GENERALLY uses 48” if available. If offset distance is not available KY generally reverts the Type 1 End Treatment2’-6”4’-0”Road Systems, Inc.
14Type 4A FLEAT-SP http://roadsystems.com/fleat.html FLEAT-SP Guardrail has SLOTS Toward The Impact HeadCable Anchor Bracket has Special Bolts with Widened Shoulders
16Installation Procedures for FLEAT-SP and SKT-SP Install standard steel guardrail posts #3 - #6 (on a straight 48” flair Post 7 to Post 1 FLEAT)Install breakaway steel end posts #1 and #2Install guardrail. All posts are spaced at 6'-3"Install cable anchor bracketInstall the SKT-SP or FLEAT-SP impact headInstall cable assemblyBegin the installation at the downstream end of the SKT-SP or FLEAT-SP to ensure that theterminal matches up with the standard downstream section of guardrail.
17Install Post 3-6 Requires Standard Post at 6’3” Post Spacing .
18Energy Absorbing End Treatmentts STRAIGHT FLARE / NOT CURVED NO CURVESNote: All of the W-Beam within the SKT-SP &FLEAT-SP end treatment must be straight. Curving the rail within the terminal is not permitted.Energy Absorbing End TreatmenttsSTRAIGHT FLARE / NOT CURVED
19Post 1 and 2 are Hinged to Facilitate Bending of the Post Upon Impact Post 1 has a Soil Plate - DownstreamSteel posts #1 & #2 are hinged steel posts. These bolted posts must have the lower section installed before attaching the top section. The lower section of the bolted hinged steel posts should NOT be driven with the upper post attached.
20Post 1 and 2 are Hinged to Facilitate Bending of the Post Upon Impact Post 1& Post 2 are NOT the SamePost 1 and 2 are NOT the samePost 1 and 2 are both two part Post that Bend or Hinge on ImpactInstall the bottom of the Post before connecting the Top portion of each PostSteel posts #1 & #2 are hinged steel posts. These bolted posts must have the lower section installed before attaching the top section. The lower section of the bolted hinged steel posts should NOT be driven with the upper post attached.
21Post 1 and 2 are Hinged Post 1 has a Soil Plate - Downstream Note how the Soil Plate is downstream of the Impact head.
22IMPORTANT SKT-SP and FLEAT-SP Assure the 5/8” or 3/4” Hinge Bolts are at the Proper Locations Post 1 – 5/8” x 8 ½” bolt, nut & 2 washers are on UPSTREAM side of the post (toward Impact Head)Post 2 - ¾” x 8 ½” bolt and nut (no washers) on DOWNSTREAM side of the post (away from Impact Head)
23IMPORTANT SKT-SP and FLEAT-SP Assure the 5/8” or 3/4” Hinge Bolts are at the Proper Locations Post 1 – 5/8” x 8 ½” bolt, nut & 2 washers are on UPSTREAM side of the post (toward Impact Head)Post 2 - ¾” x 8 ½” bolt and nut (no washers) on DOWNSTREAM side of the post (away from Impact Head)Post 1 – 5/8” x 8 ½” bolt, nut & 2 washers are on UPSTREAM side of the post with (toward Impact Head)Post 2 - ¾” x 8 ½” bolt and nut (no washers) on DOWNSTREAM side of the post (away from Impact Head)
24Post 2 is Hinged so it will bend over upon impact, slot allows the post to release from the guardrail boltTrafficBolt upper and lower post #2 together with a ¾“ x 8 ½" hex bolt and nut. Since a ground strut is not used with the SKT-SP or FLEAT-SP, an 8" hex bolt will also work. Be sure when the lower segment of the post is installed, the hinge bolt is on the downstream side of the post (opposite the impact head). The upper post #2 has an open-ended slot for the post bolt. Be sure this slot is on the upstream side of the post (toward the impact head).
25Post 2 -Assure the Guardrail Connection Bolt Slot is Facing Post #1 – Guardrail Connection Bolt slides out upon ImpactThere are open ended slot(s) for the Guardrail Connection Bolt in the flange of the post. Be sure the upper portion of Post 2 is installed with the slot facing Post 1 so the guardrail connection bolt can slip out of the slot upon impact.
26Post 2 is Installed Incorrectly Post 2 is Installed Incorrectly!! Top and Bottom are Installed Backward – Post Cannot Hinge properly – GR Bolt Cannot Release ProperlyTrafficThis Post 2 is installed incorrectly. According to previous slides the ¾” x 8 ½” Hinge Bolt for Post 2 shall be on DOWNSTREAM side of the post (away from Impact Head) and the Slots in the top portion of the post are to be oriented toward Post 1. As built the hinge cannot fold properly and the guardrail connecting bolt cannot release.
27Therefore Post 1&2 do not line up with other Post Post 3-6 require Standard Post With 8” Offset Blocks Post 1 & 2 no Offset BlocksTherefore Post 1&2 do not line up with other PostThe FLEAT-SP and SKT-SP by Road Systems.Because Post 1& 2 do not have Offset Blocks the Post will not line up with Post Therefore those Post are set 8” closer to the guardrail. Remember, as was shown with the Type 1, if you do not get Post 1 close enough to the rail you have problems getting the impact /extruder head on properly.
28Install the rail from Post 6-3 with 8” Offset Blocks and Post 1-2 No Offset Blocks Do NOT Attach Guardrail to Post 1 or 3 (Type 4A FLEAT)
29Type 1 “SKT-SP” Guardrail Bolt is Connection to Post 3 - Correct Installation Connect the Guardrailto Post 3 as shownPost 3
30Type 4A “FLEAT-SP” NO Guardrail Bolt Connection to Post 3 - Incorrect Installation Do NOT Connect the Guardrailto Post 3 just Connect the Block OutPost 3
31FLEAT-SP – Guardrail Correctly “NOT” Bolted to Post 3 – just Connect Offset Block to Post 3 Poor backfill around the post
32Guardrail Post 1-3 has 10 slots to Facilitate Bending the Rail as it Extrudes thru the Impact Head and 8 Bolt HolesThe slots in the first section of guardrail are oriented toward the impact head.Attach the guardrail end section to span from post 1 to 3 for a 12'-6" long rail, or from post 1 to 5 for a 25'-0" long rail. Most times a universal end panel with 6'-3" post spacing would be supplied. The universal end panel can be identified with eight (8) holes ¾" diameter to attach the cable anchor bracket and thirteen (13) slots. Ten (10) slots½" x 4" are in the corrugations of the rail and three (3) slots ½" x 4" are in the valley of the rail.
33Note: 2 washers on each bolt Cable Anchor Bracket – Install Shoulder Bolts Washers, Nuts and Bracket Bolts Heads on Inside of Rail NOT OutsideInstall the 8 shoulder bolts with 2 washers, one on each side of the guardrail. Be sure the shoulder bolts are placed with the shoulders of the bolts installed on the backside of the guardrail, away from traffic. Finger tighten the nut. Tap the cable anchor bracket onto the shoulder portion of the bolts using a hammer. Tighten the bolts.Road Systems goes out of their way to correctly show the proper installation of the bolts and washers – yet we have had some problems with the bolts installed backwards and without all the washers.Note: 2 washers on each bolt
34Cable Anchor Bracket – Designed to Release During an Impact Attach the cable anchor bracket shoulder bolts to the rail "finger tight". Then align the slots on the cable anchor bracket with the shoulder bolts and tap the cable anchor bracket onto the shoulder portion of the bolts using a hammer. Tighten the bolts with a wrench when the bracket is in place. The welded plate on the cable anchor bracket should be toward Post #2, as shown. Be sure the bracket is fully seated on the shoulder portion of the bolts.Bolted to Rail(8 places)Bracket rest on Shoulders of BoltsRoad Systems, Inc.
35Finger tighten Bolts & Washers – align slots on bracket with shoulder of bolts - tap into place with a hammer then tighten boltsThe bolt heads for the Cable Anchor Bracket are placed on the Inside of the Guardrail with a Washer to prevent the Widened Shoulder on the bolt from going thru the hole in the Guardrail. The Anchor Bracket rest on the Widened Shoulders of the Blots so the Cable Anchor Bracket can release during an impact. The Impact head in this example is sagging and needs to be adjusted. This is an older SKT with wooden post. Post 1 can be removed, rotated 180 degrees, drill a pilot hole and reattach the lag screw.
36Note how the Cable Anchor Bracket rest Snugly on the Shoulders of the Special Bolts
37Bolt head placed on Front Side of Rail Bolts installed backwards Assure Anchor Bracket is fully seated on Shoulder Portion of the Cable Anchor Bolts - Openings on Cable Anchor Bracket toward Post 1 Bolts Installed Incorrectly – Nuts on InsideBolt head placed on Front Side of Railwithout WasherThese Cable Anchor Bolts are in backwards. The head of the bolt is on the front side of the rail and one washer has been left off. The bolt head should be on the back side of the guardrail with 2 washers. One washer against widened shoulder of bolt and the other with the nut on the front side of the rail. The Cable Anchor Bracket cannot release properly upon impact when installed like this.Bolts installed backwardswith nuts on inside
38SKT & FLEAT - Post 1 is Hinged Arm on Impact Head Helps Bend Post Note the FLEAT-SP impact head will be installed with the rail exit slot on the traffic side. Place the impact head with the feeder guide chute over the end of the W-beam guardrail. The impact head should be positioned so that the protruding tube is on the backside of the guardrail, away from traffic. Slide the impact head forward until the post angle attachments on the impact head are aligned with the holes in post #1 (6" x 6" x ⅛" tube). Attach the impact head to the first post with two 5/16" x 1" hex bolts (each bolt gets 1 nut and (2) washers), one bolt each for the top and bottom post angle attachments.
39For the FLEAT the guardrail is also NOT attached at Post 3. is NOT attachedto Post 1.The Impact Head is.The Impact Head is connected to Post #1 with two 5/16” x 1”inch hex bolt grade 5 each with a nut and 2 washers per bolt . The guardrail is NOT bolted to post #1.For the FLEAT the guardrail is also NOT attached at Post 3.
40Impact Head Post 1, 5/16” Grade 5 bolts need 2 washers each (1 under nut & 1 under bolt head) and they need tighteningThe 2 washers are left off ,one washer by the nut and one washer by the bolt head. The Impact Head is not tightly snugged up to the bracket on the first post.This is not a big strong bolt. You must snug the Impact head up tight to the post and properly install the bolts and washers.
41Improper Installation - Extruder Head not Pushed all the way on
42SKT-SP Cable feed inside/thru the Feeder Chute FLEAT-SP cable does NOT Unlike the Type 1 SKT The Type 4A FLEAT-SP cable does NOT feed inside or Thru the feeder chute.
438”x8” Bearing Plate oriented Properly with Washer (5” up) - need restraining tie to keep Bearing Plate from TwistingThe cable gets a washer between the nut and the Bearing Plate. The hole in the 8”x8” Bearing Plate is off center with the 5 inch dimension up. Oriented correctly.The Manufacture, “Road Systems” recommends the addition of a restraining tie (not included) to hold the bearing plate in place. This could be a plastic restraining tie.
44Orientation of Bearing Plate Which Bearing Plate is almost Correct Orientation of Bearing Plate Which Bearing Plate is almost Correct? Road Systems recommends a Restraining TieFHWA Memo Nov 3, x8” steel bearing plate – Q: MANY OF OUR GUARDRAIL TERMINALS HAVE A STEEL BEARING PLATE ON THE FIRST POST THAT SOMETIMES ROTATES UNTIL IT IS UPSIDE-DOWN. IS THIS OK? A: No. This bearing plate (8 x 8-inch square with an off-center hole) must be installed with the longer dimension upright (5" dimension up and the 3" dimension down). If the cable slackens over time traffic vibrations may allow this plate to rotate downward due to gravity. If this happens the ability of post #1 to fracture in a head-on impact (thus preventing a snag point) is severely compromised. On wood posts, a nail can be driven to prevent this rotation. A solution that works on both wood and steel breakaway posts is to specify that this steel plate be fabricated with tabs on either side that will wrap around the side of the post an inch or so to prevent rotation. This is an acceptable modification to all crashworthy terminals that use this 8 x 8-inch bearing plate. Of course, it is still critical to install the bearing plate with the 5" dimension up and the 3" dimension down. (The function of the bearing plate is to transfer load from the cable to the end anchorage.)
45Tighten AnchorCable – UsingVice Grips, on Shank not on the Cable, to prevent twisting of the Cable
46FLEAT-SP Checklist Rail height is 27 ¾” Minimum No Curved Rail SKT-SP 50’ FLEAT-SP 37’ 6”Guardrail is NOT attached at Post 1 & 3End Rail Panel has Special SlotsHinge Post 2 is DownstreamHinge Post 1 is UpstreamBolt Slots in Post 2 Face Upstream
47FLEAT-SP Checklist Continued Stubs of Post 1&2 do not stick up 4”Straight 4’ FlareBolts Holding Impact Head are Properly Installed and Secure (2 washers each)8”x8” bearing Plate Oriented with 5” upCable Anchor Brackets Properly Installed Such that Bracket is Fully Seated on the Bolt ShouldersCable Taught
48Road Systems Assembly Instructions for SKT-SP and FLEAT-SP This is a very useful and well done document
49Type 4A Alternate SRT-27For over 2 years KY has suppose to have been installing the Trinity SRT-27 by Trinity however we have been installing the SRT-350 HBA 6 Post System. On March 7 & 8 a team from KYTC and Trinity toured KY to assure we have been installing an NCHRP-350 Approved Device and checking the installations to determine if they were installed correctly.
51One of the first KY Field Installations of the SRT-27 Length of Need??? This is on KY 15, 5 mile South of Jackson and was one of the first Field Installations of the SRT-27 – Installed properly except for slack in the cable.What about the length of need – could/should have been a longer. Shielded the large hazard – drop off to river – but failed to shield the smaller but closer hazard.
52Type 4A Installation Manual For the SRT-27 this is on line at:which has a link to the SRT-27 Installation Instructions & Shop Drawings in the right hand column near the bottomShop Drawing on KYTC Design Web Page
56SRT-27 Title Block and Parts List SRT-27 ERECTIONDETAILS( 3 PANELS andCR and SYT POST)
57Gating Flared End Terminal Straight Flare Pay Limits 37’ 6” SRT-27: Slotted Rail Terminal – 27 InchGating Flared End TerminalStraight FlarePay Limits 37’ 6”The SRT-27 is not an Energy Absorbing End TreatmentThe Slotted Rail Terminal (SRT-27) is a gating, flared end terminal. The straight-line flare offers a simple layout on new installations.
58Slide of schematic from installations instructions SRT-27
59I Installation Procedures for Type 4A – SRT-27 Post 1 – CR (Controlled Release)PostStrut Between Post 1&2Post 2-6 SYTP Post (Steel Yielding Terminal Post)Post 3-6 have 8” Offset BlocksGuardrail is not connected at Post 2, 3, 4 or 5Standard Guardrail Post 737’ 6” long on a straight flare
60SRT-27 Post Installation Post 9 to establish the Guardrail Tangent T7 – extend to T1Measure from T1 an offset of 4’0” perpendicular to roadway – Estb. backside of guardrail for Post 1Measure offsets of Post 7-8Estb. Straight line between Point 1 & Point 7 (represents back side of rail)
61SRT-27 Post Installation Begin @ Post 9 to establish the Guardrail Tangent Line @ T7 – extend to T1 Note that there is an offset from the tangent line at Post 7 & 8 before you go on the straight flare from Post 7 to the 4 foot or 48 inch at Post 1.
62SRT-27 Post Installation Continued Establish Points 6’3” intervalsInstalling the SYT (Steel Yielding Terminal) Post 2-6The Center of the Yielding Holes in the Post is Finished GradeCareful – do not mix SYT and SP (Standard Post) in the Type 4A Guardrail End Treatment – except for 4 ground line – very similar
63Drive SYT Post at Post 2-6. Careful SYT Post and SP (Std Post) look very similar – DO NOT INTERMIX SYT Post have4 holes nearGround LineDO NOTINTERMIXSYT Post andSP PostFor example: I have seen Post 2, 3, 5, 7 & 8 as SYT Post and Post 4 & 6 as SP Post and found the other 2 SYT post at Post 11 and 13.This is improper and the device will not work properly when constructed in this manner.
64Center of the Yielding Holes in the Post is Approx. @ Finished Grade
65SRT - 27 Post 1 CR (Controlled Release) Post Installation CR Bottom Post InstallationOrient lower portion of CR Post so the ¾” Strut Attachment Hole is closer to the nose of the systemPlace where the Strut Hole is Finished GradeSee Manufactures Instructions if Rock is Encountered
66Orient lower portion of CR Post so the ¾” Strut Attachment Hole is closer to the nose of the system
67SRT-27 Post 1 CR Post Installation CR Top Post InstallationAlign the ears of the top and bottom – top plate goes in front of the bottom (shop drawing)Insert a 5/16” x 1 ¾” Hex head Bolt in each of the 3/8” holes in bottom and top post plates – use a 5/16” washer under the hex nutTighten the nut (no torque requirements)
68Post 1 CR Top Portion Installation Align the ears of the top and bottom Slight AngleFront ViewBack View
69Insert a 5/16” x 1 ¾” Hex head Bolt in each of the 3/8” holes in bottom and top post plates – use a 5/16” washer under the hex nut5/16” Hex Bolt Washer & Nut each side
705/16” Hex Bolt Washer & Nut each side Insert a 5/16” x 1 ¾” Hex head Bolt in each of the 3/8” holes in bottom and top post plates – use a 5/16” washer under the hex nut5/16” Hex Bolt Washer & Nut each side
71Post 1 Incorrect Align the ears of the top and bottom – top plate goes in front of the bottom (shop drawing). Cable Anchor Bracket flushContractor drove the bottom of Post 1 backwards. When realize mistake instead of pulling bottom and re-driving properly.Now contractor must come back to job and correct their error. Cost lots extra $$$ to come back instead of correcting when an error is found.Bottom Post 1 driven backwards.Bottom Post 1 only has 1 hole and it is to be toward front.Cable Anchor Bracket NOT Flush & Gap Between TopBottom Ears & does not Align properly.
72SRT-27 – Installing the Strut between Post 1 & 2 Part of the Angle Strut is below grade – installer must provide a shallow valleyPlace the Angle Strut outside the Post Ear of Post 1 and backside of the SYT Post 2Place a 5/8” x 1 ¾” High Strength Hex Bolt thru ¾” hole in Post Plate and thru Slot in Post 1 – place 5/8” Washer Under Bolt Head and Hex NutA claw hammer can be used to cut a trench for the strut.
73SRT-27 – Installing the Strut at Post 1 Strut inShallow Valley
74Loose Fit Without Washer Place a 5/8” x 1 ¾” High Strength Hex Bolt thru ¾” hole in Post Plate and thru Slot in Post 1 – place 5/8” Washer Under Bolt Head and Hex NutWashers are ImportantIncorrectLoose Fit Without WasherCorrectTight Fit With Washer
75SRT-27 – Installing the Strut Post 2 Post 2 Insert 7/16” x 1 ¾” High Strength Hex Bolt with 7/16” washer thru each of the ½”ground holes of the SYT Post and thru the slots of the Strut – place 7/16 Lock Washer and Nut on end of boltTighten all Bolts – no Torque Requirements
76SRT-27 – Installing the Strut Post 2 Washers areImportantIncorrectLoose Fit Without WasherCorrectTight Fit With Washer
77SRT-27 Installing Rail Panels The Guardrail from Post 7 to Post 5 does NOT have SlotsLayout the Guardrail so Slot Guard Attachment the ends of the Slots (away from Post 1)Position Guardrail with Long Slots between Post 1&2 Post 2&3Position Guardrail with Short Slots between Post 3&4 and Post 4&5Splice and Post Bolt the 12’ 6”rail panel at Post 7 to the run of rail
78SRT-27 Installing Rail Panels Continued No SlotsShort SlotsLong SlotsConnect toStandard Rail@ Post 7Slot Guards Away From Post 1
82SRT-27 Installing Rail Panels Continued Insert and tighten 5/8”x10” Post Bolt thru 8” Offset Blocks and attach 5/8” Hex Head HGR Nut at Post 5, 4, and 3 (rail Panels are NOT attached to Post 2, 3, 4, & 5)Post 2 Insert and tighten 5/8”x2” HGR Post Bolts thru 2 holes in Flange Protector (6” Backup Plate) and the Post Shelf Angle with a 5/8’ HGR Hex Nuts
86Flange Protector & Shelf Angle Post 2 two 5/8” HGR Bolts & Nuts Flange Protector is a modified Backup Plate (2 holes). Post 2 Insert and tighten 5/8”x2” HGR Post Bolts thru 2 holes in Flange Protector and the Post Shelf Angle with a 5/8’ HGR Hex Nuts
88SRT-27 Installing Rail Panels Continued Splice the Rail Panel to the second Rail Panel at Post 5 with Splice Bolts and NutsInsert 5/8”x10” HGR Post Bolt thru the Rail Panel and Offset Block at Post 6 and secure with Hex Nut and TightenSplice the Rail Panel to the first Rail Panel at Post 3 with Splice Bolts and NutsRail Panel DOES get attached at Post 6.
90SRT-27 Installing Rail Panels Continued Insert 5/8”x2” HGR Post Bolt thru the Rail Panel at Post 1 and secure with Hex Nut and Tighten – Trinity has informed me that the bolt at Post 1 should be placed on the downstream side of the post (toward Post 2) – this is in response to reports of loose cables.Your Rail Panels are now attached
91SRT-27 Installing Slot Guards on Downstream End of Slots Place 4 Slot Guards against backside of the Guardrail Panels with Deflector Angle Gap Opening toward the Elongated Slots and connect with six 5/8”x1 1/4” Splice Bolts and Nuts – bolts inserted fromfront of railTraffic
932nd Rail Panel Installed Backwards Thus Slot Guards on Incorrect End of Slots Traffic
94SRT-27 Installing Cable Anchor Assembly Place 5/8” Washer on each of the eight 5/8” Hex Head BoltsInsert the Bolts thru the Traffic Side of the Rail Panel and the Cable Anchor Bracket (on the backside of the Rail Panel) & Secure with Hex HGR Nuts
95Front and Back of Cable Anchor Assembly Bolts & Washers (front) and Nuts (Back) Back of Rail TrafficFront of RailTraffic
96SRT-27 Installing Cable Anchor Assembly Continued Slide one end of Cable into Cable Anchor BracketPlace 1” washer and Hex Nut on End of the Cable extending thru the Cable Anchor Bracket
97SRT-27 Installing Cable Anchor Assembly @ Post 1 Slide the other end of Cable thru the Hole Between the Top and Bottom CR Post 1At Post 1 Place the Cable Anchor Bracket on the CablePlace the Short Bent Leg of the Cable Anchor Bracket over the Top Edge of the Post PlateSecure with a 1” Washer and Hex Nut
98SRT-27 Installing Cable Anchor Assembly @ Post 1
99View of Cable Anchor Assembly in Front of Post 1
105SRT-27 Installation Checklist Rail Height 27 ¾” MinimumSite grading such that Ears on bottom of CR Post 1 do not exceed 4” above groundAnchor Cable TaughtGuardrail is NOT Post 2, 3, 4 & 5Slot Guards in place and Deflector Angle Gap Opening oriented toward Elongated Slots
106SRT-27 Installation Checklist Continued Guardrail panels Oriented correctly and Lapped in direction of TrafficBackfill around Post if necessary and properly compactedSYT Post 2-6 Center of Yielding Holes are approx. at the Finished Grade
108SRT-27 and FLEAT-SP Installation manuals SKT-SP & FLEAT-SP
109Manufactures Installation Info FLEAT-SP Road SystemsSRT-27 Trinity Highway Products which has a link to the SRT-27 Installation Instructions lower right columnNote: SRT-27 Shop Drawing only available on KYTC Design web page - Standard Drawings
1101. Q & A Time Post 2 FLEAT OK?? Post 2 Installed Backwards Cannot hingeor releasefrom railThis Post 2 is installed incorrectly and not backfilled properly. According to previous slides the ¾” x 8 ½” Hinge Bolt for Post 2 shall be on DOWNSTREAM side of the post (away from Impact Head) and the Slots in the top portion of the post are to be oriented toward Post 1. As built the hinge cannot fold properly and the guardrail connecting bolt cannot release. The 2 errors will prevent the post from releasing from the rail and bending at the hinge during upon impact. Could lead to serious injury.
1112. Q & A Time What is Incorrect here?? Cable extremely looseThe cable gets a washer between the nut and the Bearing Plate. The hole in the 8”x8” Bearing Plate is off center with the 5 inch dimension up. NOT Oriented correctly. The Cable is NOT Tightened Properly. The Manufacture, “Road Systems” recommends the addition of a retaining tie (not included) to hold the bearing plate in place. This could be a plastic retainer tie.Bearing Plate Rotated5” to be up
1123. Q & A Time FLEAT-SP Third Post Post 3 of FLEATIs NOT AttachedOffset Block is AttachedPlease note that the SKT does get a bolt at the Post #3 the FLEAT does not.
1134. Q & A Time FLEAT-SP Cable Anchor Bracket Back of RailFrontof RailThe Cable Anchor Bracket Bolts were placed with the Shoulder on the Front Side of the Guardrail. The Shoulder MUST be on the Backside and the 1-1/16” OD x 9/16” ID washers must be placed so the shoulder of the Bolt will not slip thru the hold on the guardrail. With the bolts backwards, the nuts are so tight that the Cable Anchor Bracket will NOT Release Properly Upon Impact.Bolts Installed Backwards
1145. Q & A Time Post 1 FLEAT-SP Anything Missing?? Washers MissingUnder Nut & BoltHead on Top BoltsThe top washers outside and inside Post 1 are missing.The Impact Head of the FLEAT-SP or SRT-SP is very heavy and the washers are needed on these very small Grade 5 Bolts.
1156. Q & A Time SKT-27The SKT-27 - is Unique because the Guardrail is NOT Post??? Guardrail is NOT Post 2, 3, 4 & 5