IG de Gabion Installation
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projecting selvedge wire diaphragm folding lines secure diaphragms to front and back secure ends to side PRODUCT INSTALLATION GUIDE Rev: 00, Issue Data 30.04.2004 GABIONS Figure 2 Lacing wire Rings Max 200 mm Figure 4 Figure 1 Figure 3 end panel fr ont panel end panel back pa nel Material Delivery Gabions are manufactured with all components mechanically connected at the production facility. All gabions are supplied in the collapsed form, either folded and bundled or rolled. The bundles are compressed and strapped together at the factory for easy shipping and handling. Lacing wire is shipped in coils. Fasteners are shipped in boxes. Preformed stiffeners are shipped in bundles. Assembly The folded units shall be taken out from the bundle and placed on a hard flat surface. Gabions shall be opened, unfolded and pressed out to their original shape. Front, back, and end panels shall be lifted to a vertical position to form an open box shape. Panels shall be fastened together with the projecting heavier gauge selvedge wire by firmly wrapping the selvedge wire around the selvedge or edge wire of the intersecting panel or back panel. Inner diaphragm panels shall be lifted into a vertical position and secured in the same manner. All edges of the dia- phragms and end panels shall be tied or fastened to the front and back of the gabion. Fastening Procedure When using tie wire, cut off a piece of wire approximately 1.5 times the length of the edge to be tied. The maximum length of the edge to be tied at one time shall not exceed 1 m. Longer edges shall be joined by several lengths of wire. Tie wires shall be secured around the selvedge wire or heavier edge wire, where present, by looping and twisting the lacing wire around itself. Proceed tying with alternate double and single loops. Dou- ble loops shall be made at intervals not greater than 150 mm. The basket pieces should be pulled tightly together during the tying operation. The other end of the tie wire shall be secured by again looping and twisting the wire around itself. When using tie wire to assemble the units, pliers may be used to create tight joints. Care should be taken to avoid damaging the wire coating. When steel ring fasteners are used, the use of either a mechani- cal or a pneumatic fastening tool is required. Rings shall be in- stalled at the top and the bottom connections of the end and centre diaphragms and then a maximum spacing of 200 mm along all edges shall be used. Foundation preparation The foundation on which the gabions are to be placed shall be level, and graded to the elevations as shown on the project con- struction drawings. The foundation for gabions shall be level, smooth, and free of surface irregularities, loose material, and vegetation in accordance with the project specifications. Appro- priate measures shall be taken for filtering and drainage of the foundation, as per the project specifications (filter cloth, drain works, etc.). Geotextiles required to be installed behind or un- derneath gabion structures shall comply with the requirements for subsurface drainage applications. Installation and Filling After the foundation has been prepared, the pre-assembled gabions are placed in position empty, and shall be tied or fas- tened to adjacent gabions along all containing edges in order to form a continuously connected, monolithic structural unit. Gabi- ons shall be placed front to front and back to back in order to expedite the stone filling and lid lacing operations. Rocks for gabions may be produced by any suitable quarrying method, and by the use of any device that yields the required sizes within the gradation limits chosen. Rocks shall be hard,
Transcript of IG de Gabion Installation
projecting selvedge wire diaphragm folding lines secure diaphragms to front and back secure ends to side PRODUCT INSTALLATION GUIDE Rev: 00, Issue Data 30.04.2004 GABIONS Figure 2 Lacing wireRings Max 200 mm Figure 4 Figure 1 Figure 3 endpanelfrontpanelendpanelbackpanelMaterial Delivery Gabionsaremanufacturedwithallcomponentsmechanically connectedattheproductionfacility.Allgabionsaresuppliedin thecollapsedform,eitherfoldedandbundledorrolled.The bundlesarecompressedandstrappedtogetheratthefactory for easy shipping and handling. Lacing wire is shipped in coils. Fastenersareshippedinboxes.Preformedstiffenersare shipped in bundles. Assembly The folded units shall be taken out from the bundle and placed onahardflatsurface.Gabionsshallbeopened,unfoldedand pressed out to their original shape. Front, back, and end panels shall be lifted to a vertical position to form an open box shape. Panelsshallbefastenedtogetherwiththeprojectingheavier gaugeselvedgewirebyfirmlywrappingtheselvedgewire aroundtheselvedgeoredgewireoftheintersectingpanelor back panel. Inner diaphragm panels shall be lifted into a vertical position and secured in the same manner. All edges of the dia-phragmsandendpanelsshallbetiedorfastenedtothefront and back of the gabion. Fastening Procedure Whenusingtiewire,cutoffapieceofwireapproximately1.5 times the length of the edge to be tied. The maximum length of theedgetobetiedatonetimeshallnotexceed1m.Longer edges shall be joined by several lengths of wire. Tie wires shall besecuredaroundtheselvedgewireorheavieredgewire, wherepresent,byloopingandtwistingthelacingwirearound itself. Proceed tying with alternate double and single loops. Dou-bleloopsshallbemadeatintervalsnotgreaterthan150mm. Thebasketpiecesshouldbepulledtightlytogetherduringthe tying operation. The other end of the tie wire shall be secured by again looping and twisting the wire around itself. When using tie wiretoassembletheunits,pliersmaybeusedtocreatetight joints. Care should be taken to avoid damaging the wire coating.When steel ring fasteners are used, the use of either a mechani-cal or a pneumatic fastening tool is required. Rings shall be in-stalledatthetopandthebottomconnectionsoftheendand centrediaphragmsandthenamaximumspacingof200mm along all edges shall be used. Foundation preparationThe foundation on which the gabions are to be placed shall be level, and graded to the elevations as shown on the project con-structiondrawings.Thefoundationforgabionsshallbelevel, smooth,andfreeofsurfaceirregularities,loosematerial,and vegetationinaccordancewiththeprojectspecifications.Appro-priatemeasuresshallbetakenforfilteringanddrainageofthe foundation,aspertheprojectspecifications(filtercloth,drain works,etc.).Geotextilesrequiredtobeinstalledbehindorun-derneathgabionstructuresshallcomplywiththerequirements for subsurface drainage applications. Installation and Filling Afterthefoundationhasbeenprepared,thepre-assembled gabionsareplacedinpositionempty,andshallbetiedorfas-tened to adjacent gabions along all containing edges in order to form a continuously connected, monolithic structural unit. Gabi-onsshallbeplacedfronttofrontandbacktobackinorderto expedite the stone filling and lid lacing operations.Rocksforgabionsmaybeproducedbyanysuitablequarrying method,andbytheuseofanydevicethatyieldstherequired sizeswithinthegradationlimitschosen.Rocksshallbehard, 123 BC 1.Pliers 2.Pliers with nipper 3.Nipper Pneumatic Spenax tool Manual tool Officine Maccaferri S.p.A. Via Agresti, 6 - P.O. BOX 396 - 40123 Bologna (Italy) Tel. (+39) 051-6436000 - Fax (+39) 051-236507 E-mail: [email protected] - Web site: www.maccaferri.com 1/3 h1/3 h1/3 hh1/3 h1/3 h1/3 hhPhase 1 Phase 2 Phase 3 Figure 8 Figure 7 Figure 6 Figure 5 Cross ties with lacing wireCross ties with stiffeners Figure 7 A Figure 9 angular to round, durable and of such quality that they shall not disintegrate on exposure to water or weathering during the life of the structure.Gabion rocks shall range between 100 mm and 200 mm. The range in sizes may allow for a variation of 5% oversize and/or 5%undersizerock,provideditisnotplacedonthegabion exposedsurface.Inallcases,theoversizerockshallnotbe largerthan250mm,andtheundersizerockshallnotbe smaller than 5 mm. Rock shall be placed in 300 mm lifts for 1 m high gabions, and 250mmfor0.5mhighgabions.Thefilllayershallneverbe morethan300mmhigherthananyadjoiningcell.Careshall be taken when placing the stone to ensure that the PVC coat-ing on gabions is not damaged. After a layer of rock has been placed in the cell, sufficient hand manipulation of the rock shall be performed to minimize voids and achieve a maximum den-sityoftherockinthegabion.Therockinexposedvertical facesshallbehandplacedtoreducevoidsintheouterface. Stiffeners or internal cross ties shall be installed connecting the frontandbackfacesofanysupportedorexposedfaceatthe vertical third points for a gabion 1 m high, as the cell is being filled.Gabionunitsinstalledatthewallends,havingtwoex-posed sides, shall also include a set of cross ties installed per-pendicularlytothelateralexposedface.For0.50mhighbas-ketswhenusedasrevetment,stiffenersorinternalcrossties are not required. When more than one vertical layer of gabions isinstalled,unitsshallbeoverfilledtoapproximately25to40 mmtoallowfornaturalsettlement.Thetopsurfaceshallbe smoothlylevelled,minimizingvoids.Ensurethatdiaphragm tops are accessible for connecting. Closing After the rock has been levelled and the voids minimized, fold theliddownandpulledgesofthepanelstogether.Itshould require a light stretching using an appropriate closing tool or lid closerinordertobringthetwogabionpiecestogether.Care shall be taken that the mesh is not deformed or the coating on the wire damaged. The projecting selvedge wire of the lid shall bewrappedtwocompleteturnsaroundtheselvedgewireor edgewireonthesides.Thelidshallbetightlytiedalongall edges, ends and tops of diaphragms. Adjacent lids may be tied orattachedsimultaneously.Allprojectingsharpendsofwire shall be turned in on the completed gabion structure.
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