05-10-1993 Council Packet - Laserfiche WebLink

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TECHNICAL SUPPORT GUIDEUNE SPECIFICATIONS This section shall provide all information required (or the furnishing of all labor, materials, equipment, and incidentals necessary for placenoent of soil reinforcement materials specified herein. Other sections related to this mrk. • Excavation • Embankment • Site Grading 1.0 Material Handling 4 Storaoe Upon arrival at site, the geogrid should be checked to ensure the prtyer material (strength) Is received. A product certification should be provided with each shipment stating the material conforms to the ^^uct spMificatior^ published by the suffer. ease of Installation, the material should be stored above -lO^F during winter months. Care should be taken to prevent mud. wet coment. epoxy, and like materials, which may permanently affix themselves to the gridwork. from coming in contaci with the geogrid. The rolled material may be laid flat for storage and should be covered with a light cokxed tarpaulin to prevent longterm exposure to sunlight. 2.0 Malafial SpedfVcatlona The geogrid shall be composed of polyester yarn encapsulated in a protective coating. The polyestsf 3.0 Reinforcement Placement Prior to placing the reinforcement, the excavation shall be cleaned of all excess material and the foundation base proofrolled. The reinforcement shall be rolled out. cut to length, and laid at the proper elevation, location, and orientation as shown on the contract drawings. Orientation of the reinforcement is of extreme importance since geogrids vary In strength with roll direction. The roll direction of Miraghd should be laid in the direction of main reinforcement. The contractor shall be responsible for correct orientation. , . Reir^orcement should be placed coincident with the compaction lift nearest the design elevation on the drawing. No partial or haiMift thickness are required. Geogrids can be placed directly on the existing fill surma No special surface treatment, leveling or smoothing, is reo ’ilred. If a shoepsfoot roller Is utilized, the Imprints are an acceptable I The reinforcing material should be cut to length as ! shown on the contract drawings. A razor blade. ‘ scissors.orsharpknifeareacceptablelnstruments j to cut the material. Should it be necessary to sec- ] lion a roll width, a high speed, abrasive saw or ^ vibrating knife edge works well. 4.0 Placement of Fill Over Reinforcement Control of the fill placement should be done by the starnfard method utilized for this cortiract as de-. fined in Pfojed S^ifications cx a? ^ j surface for reinforcement placement After being rolled out the reinforDni yarns shall be ioin^ ^ knitting or ultrasonic weld- inaing M evenly a^a^)unctk>n^ characteristics. gmalefial should be tensioned by hand until it is taut, free of wrinkles, and t^ng flat Overlaps as shown on the drawings should be maintained. No overlaps will be allowed in the direction of strength. A^acenl roll widths should (weriap a minimum of 4 inches. Mechanical connections be twe en acQacent rolls should be made '4 this time, if required. Certain fin properties. fiH placement pcoo^ures, andAx weather conditions may require the reinforcement to be held in place by stapl^ pins, sand bags, or till, as directed by the engineer. - MIRAGRID PHYSICAL PROPERTIES the engineer. Extreme care should be taken to ] prevent wrinkle development andAx slippage of : reinforcement during fin placement and shading. When practical, fill is to be placed in the directkxi . In which the reinforcement was rolled out, to aid ’ tensioning. However; if fill must be placed trans- j versa to die roll length direction, slight (4-Inch) ; » between rollvtidths with the top piece Of ; reinforcement being the first to receive fill, will ] prevent permanent folding of reinforcement./f- « Rubber-tired equipment is alow«d to paie over bare ) reinforcement at slow spee ds, less than 10 mph, ; ..............................raking. Ttek equipment * onto Dare reinforcement To avofo darning the reinforcernent. there must TENSILE STRENGTH & MODULUS Main Reinforcing Direction TENSION CREEP Cross- Direction Ty^e Ty^e Ty^e Tensile Strength (Ibs/ft) Peak 2% Strain Retained Modulus (ibs/ft) LTAOL after 1000 hrs 2.600 6.700 1.550 1.650 525 1,330 300 350 21.000 54.000 12.500 13.500 Long Term Allowable Design Load (LTADL) (Ibs/ft) Maximum Allowable Total Strain (ot) After 2000 hours & LTADL Main Reinforcing Cross- Direction Direction Type Type Type Type A 8 A B be a minimum of six inches of fill on top of the , reinfoicemetr^ before tracked equipment can be operated.- : ! F^ vertical walls, it wiN be required to temporivily : form the vertical lace and brace it for the horizontal loading created by compacting fill behir>d the 4 wall. Ibnsion should be maintained in the Miragrid ] until at least 70% of the grid area is covered with j fill. This locks tension Into Miragrld minimizing fadng movement lor vertical walb. The bracing and forming shall be aa shown on the oonetniction drawings or an alternate system that provides an equivalM reaction for pro^ compamn behind the well.. V f.* /. 1.050 2.700 5 5 630 5 650 5 54) Rtefment L R^ment will be based on the contract unit price per net square yard of reinforcing metofiel ptebed. This will be exclusive of overlap and wastage. Wastage directed by the en gineer wW be at me contract unit price. ^ The contract unit price shal Indude cost of me reinforcing materiel; coet of labor to handle, afore place, andciitthe reini Jng materiel; equipmem __________________ handle, afore, and place the reinforcing material; cost of excoee rekiiorcing maierid reguked for the overiape, iointe, extanslonai and end________Jsalvagee; end material and labor to furnish and kisSall etaplea, pegs, eto. to fix rein- fordng material during fill placement. I ... ■. .r-t ■ n.v 10' CALV. ST. SPIKC 3/8' 0 -------------— BE-MINIMUM 3 PER 8' timber 4.5' TREATED LANDSCAPE timbers 6'X 6' \ TREATED \ LANDSCAPE TjM,aLR. 8 PLYWOOD BATTEN 1/2 i ^ MIRAGRID COMPACTLD drainage FACING STML 10 PENNY NAIL compacted native soil RetMiO^yg MHU ftcmg Conn^ctfons MiRAGRIO hooked around f FIBERGLASS r ^CWEL FiBERCUSS —keystone " standard unit KEYSTONE WALL SYSTEMS u ragrid COMPACTED NATIVE SOIL X compacted aggregate J \ between , inside and BEHIND UNITS. -•24 -12'*^ SLOPES FROM 30* TO 45*MIRAGRID INSTALLED PARALLEL TO SLOPE FACE MIRAMAT 1800 EROSION CONTROL material , with HYDR0SEED\ MAIN REINFORCEMENT TO BE installed PERPENDICULAR TO SLOPE FACE Snwp Slop* SurflKt SLOPES FROM 50* TO 70' MIRAMAT 1800 WITH i - 4 - HYDROSEED t) r<_4Ct -*0 2) :cw»*CT r»a. *4 w 1-J .r r — ' * .• r .7- TT. •1 \