Sci70gm And Sci100gm-Books Pdf

SCI70GM AND SCI100GM
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TABLE OF CONTENTS, OVERVIEW 1, Maintenance 1, Crash Performance 1. SPECIFICATIONS 2, Description 2, System Dimensions Weight 2. DESIGN CRITERIA 2 5, Foundations 2, Support Structure 3. Location 3, Transition Design 3, INSTALLATION 5 9, Installation Performance Statements 5. Equipment List Appendix B, Site Preparation 5, Foundations 5.
Placement of Crash Cushion 6, Anchor Installation 6. Delineator Panel Attachment 7, Transition Installation 7. Final Inspection 8, RESETTING SMART CUSHION AFTER IMPACT 8 12. Site Preparation 8, Re Extension Inspection After Frontal Impact 8. Side Impact Inspection Repair 10, Cable Inspection Procedure 10.
Cylinder Inspection 11, Anchor Bolt Inspection 11, Side Panel Inspection 11. Side Guide Inspection 11, Final Inspection 11, Non Repairable Impacts 12. Periodic Maintenance 12, APPENDICES, SCI SMART CUSHION PARTS LIST A. EQUIPMENT LIST B, ATTENUATORS, SMART CUSHION TEST LEVEL II C. SMART CUSHION TEST LEVEL III D, FOUNDATIONS, Test Level II Foundation E.
Test Level III Foundation E 2, TRANSITIONS, Jersey F Barrier NCHRP 350 F. Jersey F K Shape Barrier MASH G, Median Barrier Single Slope 24 26 75 Inch Base 610 679 mm H. Jersey F Shape 30 38 Inch 762 965 mm Variable Width Base I. Concrete Block 24 Inch 610 mm J, Concrete Block 30 Inch 762 mm K. Concrete Block 36 Inch 914 mm MASH L, Concrete Block 38 44 Inch 965 1118mm M. Thrie Beam Wide Taper N, Thrie Beam Bidirectional Traffic Design O.
W Beam Bidirectional Traffic Design P, W Beam 28 Inch High Unidirectional Traffic Design Q. W Beam 31 Inch High Unidirectional Traffic Design R. Spanner For Concrete Block S, Offset Concrete Block T. The SMART CUSHION impact attenuators are manufactured by Hill and Smith Inc The Test Level 3 model is NCHRP 350 MASH. approved by the FHWA The Test Level 2 is NCHRP 350 approved and has passed the MASH capacity test 2 31 Based on that. test it is MASH approved in many states They and are fully redirective non gating and bi directional SMART CUSHION. impact act attenuators are used to help protect motorists from hazards in both permanent and temporary work zone locations. They can be attached to most types of median and roadside barriers. The SMART CUSHION attenuators use a patented system for stopping vehicles The system is speed dependent and stops. small and large vehicles by automatically regulating the stopping force exerted on a vehicle Essentially the system provides the. necessary forces based on the speed of the vehicle automatically compensating for the mass of the vehicle. The SMART CUSHION attenuators are slightly tapered from front to rear This allows the side panel sections to collapse over the. next section without stress or damage During collapse the parts move freely past each other and do not become wedged during. the impact, Wide temperature variations and temperature extremes do not affect the performance of SMART CUSHION impact attenuators. Maintenance, SMART CUSHION impact attenuators are low maintenance units A trained two person maintenance crew can return most im. pacted SMART CUSHION attenuators to full service within 30 minutes This short repair time reduces the maintenance workers. exposure to traffic and minimizes traffic congestion Side impacts rarely require a repair which eliminates worker exposure repair. costs and traffic delays exposure, Crash Performance.
The SMART CUSHION broke new ground during NCHRP Report 350 crash testing In the high speed test 100 kilometers per hour. 63 miles per hour the small vehicle s deceleration rate was significantly lower than any previously recorded value 9 8 G s as. compared to previous low of 13 4 G s This means less impact forces on the vehicle s occupants and a reduced risk of injury due. to a much lower impact severity, The NCHRP 350 Test Level 3 Smart Cushion performed and passed ALL MASH tests to exact MASH standards with no modifica. tions The NCHRP Test Level 2 Smart Cushion also performed and passed the pickup capacity test 2 32 with no modifications. These tests were performed by an accredited independent testing facility As with the NCHRP 350 tests MASH frontal impacts. only needed two shear bolts to reset the unit back to full operation status. SPECIFICATIONS, Description, The SMART CUSHION is a re directive non gating crash attenuator that consists of a base supporting frames a sled side. panels a wire rope cable sheaves and a shock arresting cylinder The base is anchored to the mounting surface and provides. support for the frames that are mounted on it The support frames hold the side panels that provide a flat outer redirective surface. for side impacts The sled provides redirective support for side impacts and deceleration force for frontal impacts The SMART. CUSHION telescopes rearward upon frontal impact and can be reset with minimal repair parts. System Dimensions Weight, SCI 70 GM SCI 100 GM, Width 24 inch 610 mm 24 inch 610 mm. Length 13 feet 4115 mm 21 feet 6550 mm, Height 33 inch 840 mm 33 inch 840 mm. Weight 2465 lbs 1120 kg 3450 lbs 1570 kg, Test Level MASH NCHRP 350 Level 2 MASH NCHRP 350 Level 3.
DESIGN CRITERIA, SMART CUSHION impact attenuators comply with MASH and NCHRP Report 350 They are designed for temporary work zone. and permanent applications, Foundations, Foundations must be a flat surface with longitudinal and cross slopes of 10 1 horizontal vertical or less SMART CUSHION. impact attenuators should not be located over drainage basins or expansion joints Portland cement concrete foundation pads are. preferred for permanent installations asphaltic concrete foundation pads are appropriate for temporary work zone installations. The following table describes the foundations that may be used See Appendices for drawings. Foundations, Pad Material and Thickness Anchor Embedment. 6 inch 150 mm reinforced PCC 1 5 inch 140 mm, 8 inch 205 mm non reinforced PCC 5 inch 140 mm. 3 inch 75 mm AC 2 3 over 3 inch 75 mm non reinforced PCC 16 inch 420 mm. 6 inch 150 mm AC over 6 compacted subgrade 3 16 inch 420 mm. 8 inch 205 mm AC 3 16 inch 420 mm, Notes 1 Portland cement concrete 2 Asphaltic concrete 3 Minimum compaction 95 of optimal.
Concrete compressive strength shall be 4000 psi 28 MPa at 28 days. Foundation lengths may vary when using wide transitions. Support Structure, SMART CUSHION impact attenuators are self supporting and do not require an additional support structure. The SMART CUSHION impact attenuator s location determines its position and transition requirements. 1 Approach Zone SMART CUSHION impact attenuators should not be placed directly behind raised curbs that exceed. 4 inches in height The longitudinal and cross slopes in front of the device should not exceed 10 1 horizontal vertical. 2 Barrier Width SMART CUSHION impact attenuators are 24 inch 610 mm wide at the rear Barriers. 24 inch 610 mm wide or less can be shielded without using a transition if there is no reverse direction traffic Barriers. that are wider than 24 inch 610 mm and or have reverse direction traffic require a transition available from. Hill and Smith Inc, 3 Barrier Height SMART CUSHION impact attenuators are approximately 33 3 8 inch 848 mm high. 4 Barrier Shape SMART CUSHION transitions allow for connection to many barrier shapes. Transition Design, SMART CUSHION impact attenuators can be attached to many different barrier shapes The attenuators are designed for. direct attachment to 24 in wide barriers and Jersey F Shape barriers The SMART CUSHION side panels must have an. unobstructed travel zone for 30 behind the attenuator to allow a full collapse SMART CUSHION transitions provide. this travel zone in front of wide hazards, See appendices for SMART CUSHION transition drawings Additional transitions are available for other frequently used. applications Contact us for drawings and details, Transitions.
Necessary Locations see Figure 1 Necessary Locations. There is reverse direction traffic within the clear zone. The barrier intrudes into the side panels travel zone. Transition required on this side, SMART CUSHION Median. Figure 1 Necessary Locations, Examples are median applications with bidirectional traffic two lane roads with crossover potential etc. Unnecessary Locations see Figure 2 Unnecessary Locations. No reverse direction traffic within the clear zone. The barrier does not intrude into the side panels travel zone. SMART CUSHION Barrier, Figure 2 Unnecessary Locations. Examples are traffic splits shoulder applications with no crossover potential one way roads etc. Determining Side of Transition, The transition s side is determined by standing at the front of the attenuator looking rearward toward the barrier to choose. between left and right, INSTALLATION, Installation and Performance Statements.
Proper performance within MASH NCHRP 350 design limits depends on correct installation of the SMART CUSHION on an. approved foundation Any SMART CUSHION not installed according to the drawings and the requirements of this installation. manual may present an unsafe condition and should be reinstalled accordingly. Impacts with vehicles whose size or mass are outside of those tested according to MASH NCHRP 350 or with vehicles traveling at. speeds greater than those tested according to MASH NCHRP 350 will not necessarily produce results within the test criteria The. crash cushion is in conformance with all requirements of MASH Test Level 3 MASH Test Level 2 test 2 31 and NCHRP 350 Test. Levels 2 3, All work during installation repair and inspection of the SMART CUSHION should be performed according to fed. eral state and local laws, Equipment List, See Appendix B. Site Preparation, Check to make sure there are no drains expansion joints or buried conduit cables or utility lines in the footprint space where. the attenuator will be placed Remove any curbs 4 inch or obstacles in front of or beside where the attenuator will be installed. for a minimum distance of 12 feet from any edge of the attenuator Be sure to set up proper traffic control before beginning any. installation or repair work at the site, Foundations reference Appendices E and E2. New foundations should be installed according to Appendix E Foundation Drawing Concrete cure strength should reach 4 000. psi minimum before use The surface of the foundation must be cleaned of all debris dirt mud sand etc as the crash cushion. must sit on a flat plane although longitudinal and or cross slope of up to 10 1 horizontal vertical is allowed. Any of the following foundations will meet the minimum requirements. 6 inch reinforced concrete pad, 8 inch non reinforced concrete pad.
3 inch asphalt over 3 inch of concrete, 6 inch asphalt over 6 inch of compacted sub base. 8 inch asphalt, Note Concrete should be 28 MPa or 4000 psi minimum at full cure The slope should not exceed 10 1. Installing the SMART CUSHION on an existing foundation may result in anchor bolt locations corresponding to rebar positions in. the foundation When rebar is encountered rebar bits should be used as concrete bits may bend around the rebar and continue to. drill at an angle while the anchors will not bend, Prior to installing the SMART CUSHION on an existing foundation the concrete must be thoroughly inspected for slope signs. of cracking surface wear shifting from original position undercut of earth below or to the sides supporting the foundation. settling and any other signs of age or deterioration which may make the foundation unusable If any of these signs are evident. the foundation should be removed and a new one must be installed according to requirements stated If prior bolt patterns are. present use proper engineering calculations to assure adequate strength in the new holes. Placement of the SMART CUSHION, Measure the correct distance and offset of the SMART CUSHION according to the type of object being shielded and the type of. transition being used The dimensions shown on the transition drawings may be used as a guide for this System drawings are. also available, The crash cushion is shipped in one piece fully assembled Use a choked four point attachment on panel support frames 3 4.
behind the sled for the Test Level 3 unit Do not lift using the side panels only The lift points on the Test Level 2 unit are the. 1st and 2nd frames behind the sled Lift the SMART CUSHION off the transporting vehicle with a boom or forklift of sufficient. capacity and place it in the position marked on the foundation. Once in place double check the measurements to be sure of the proper location of the SMART CUSHION. Warning On a full collapse the last set of side panels will telescope 30 inches beyond the last terminal brace at the. rear of the crash cushion All objects that may interfere with this motion can affect the performance of and cause. undue damage to the crash cushion, Anchor Installation. Embedment Requirements are as follows, 1 6 inch reinforced concrete pad anchor embedment of 5 inch torque value of 170 N m 125 ft lbs. 2 8 inch non reinforced concrete pad anchor embedment of 5 inch torque value of 170 N m 125 ft lbs. 3 3 inch asphalt over 3 inch of concrete anchor embedment of 16 inch torque value of less than N m 10 ft lbs. 4 6 inch asphalt over 6 in of compacted sub base anchor embedment of 16 inch torque value of less than 14 N m. 5 8 inch asphalt anchor embedment of 16 inch and a torque value of less than 14 N m 10 ft lbs. MANUAL SMART CUSHIONSMART CUSHION SCI 70 GM SCI 100 GM Width 24 inch 610 mm 24 inch 610 mm Length 13 feet 4115 mm 21 feet 6550 mm Height 33 inch 840 mm 33 inch 840 mm Weight 2465 lbs 1120 kg 3450 lbs 1570 kg Test Level MASH NCHRP 350 Level 2 MASH NCHRP 350 Level 3 DESIGN CRITERIA General SMART CUSHION impact attenuators comply with MASH and NCHRP Report 350

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