Designing With Gabions Amp Mattresses Esi Info-Books Pdf

Designing with Gabions amp Mattresses ESI info
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CONDITIONS LIMITATIONS PAGE 1,INTRODUCTION PAGE 2,WHAT ARE GABION AND GABION MATTRESSES PAGE 3. WELDED MESH GABIONS PAGE 4,WOVEN MESH GABIONS PAGE 5. WOVEN MESH GABION MATTRESSES PAGE 6,FILLING MATERIALS PAGES 7 8. Gabion Mattresses,DESIGN MATTRESS PROTECTION PAGE 9. SLOPING REVETMENTS PAGES 10 12,STEPPED REVETMENTS SCOUR PAGES 13 18.
PROTECTION,OUTFALLS PAGES 19 20,CHANNEL LININGS AND DROP STRUCTURES PAGES 21 24. GROYNES PAGES 25 26,SPECIFICATIONS PAGES 27 34,woven mesh zinc PVC coated mattresses. gabion 27 system,welded mesh gabion 39 system 3mm,welded mesh gabion 39 system 4mm. welded mesh gabion 39 system 3 4mm,welded mesh gabion 39 system 5mm. woven mesh zinc coated gabions,woven mesh zinc PVC coated gabions.
Conditions Limitations, The copyright design right or other intellectual property in this guide. and the products set out herein shall as between Cerana Limited. trading under the Trade Mark of Enviromesh and any customer or. potential customer of Enviromesh be the property of Enviromesh. This publication is intended as a general overview of the subjects dealt. with and is not intended and should not be used as a substitute for. taking detailed and specific advice in any specific situation The. recommendation and advice given in this booklet is given without. liability on the part of Enviromesh or its employees and should not be. relied upon for any particular action or inaction, Enviromesh shall not be liable to compensate any other party for any. loss including any consequential loss arising out of any inaccuracies. in or omissions from this guide, It is the responsibility of all parties to satisfy themselves that the. designs calculations and specifications set out in proposals submitted. by Enviromesh are correct and no responsibility is accepted by. Enviromesh for the accuracy of the designs and specifications. included in such proposals,Enviromesh,Garner Street Business Park. Stoke on Trent,Staffordshire,Tel 0044 0 845 136 0101.
Fax 0044 0 845 136 0202,Email roger farmer enviromeshgabions com. Web www enviromeshgabions com,Introduction, Gabions and gabion mattresses have long been used as a system for erosion protection. on inland water courses,Typical applications are as follows. Channel linings,Bank and bed protection,Culvert headwall inlet and outlet structures. Protection around bridge piers,Outfall protection,River training works.
Fish habitats, Similarly gabions and gabion mattresses have been used on coastal protection schemes. Typical applications are,Top of the beach protection. Sloping revetments,Gabion walling,Beach replenishment. Water is a powerful force and unless the protection schemes are correctly designed then. potential failure can occur,What are Gabion and,Gabion Mattresses. The term gabion refers to a modular containment system that enables rock stone or other. inert materials to be used as a construction material. The modules or cages as they are known are formed of wire mesh fabric panels jointed to. form square or rectangular shaped units The main difference between a gabion and a. gabion mattress is in the ratio of plan area to height. A gabion is a box shape where the height is normally between 0 5m and. A gabion mattress is a unit that has a large plan area compared to its height. These are normally supplied in heights of between 0 17m to 0 5m. The units are pre assembled in the factory to form a flat pack system. These flat packs are then supplied to the customer and formed into the final shaped. module on site with the necessary lacing wire or C rings as required Each module has to. be connected to adjacent modules to form a monolithic structure. The types of mesh used must be of a non ravelling type such as welded steel wire mesh or. hexagonal woven wire mesh and provided with corrosion protection to suit the required. exposure conditions, Although gabion mattresses can be manufactured from a welded mesh this mesh is not as.
flexible as that manufactured from double twist hexagonal woven wire Erosion protection. schemes generally require units that are flexible hence it is recommended that the. hexagonal woven wire mesh gabion mattresses are used. Welded Mesh Gabions, These gabions are manufactured from a square mesh normally of opening size. 76 2mm x 76 2mm where the longitudinal wires are welded to the cross wires at there. intersection points This type of fabric manufacture produces a dimensionally stable mesh. This mesh produced in panels or rolls is then cut into the required panel sizes to form the. flat pack unit This is done by clipping the face rear side and diaphragm panels. intermediate dividing panels to the base panel so that they can rotate to be folded flat. The lid may be clipped to the front or back panel or left loose dependant upon the unit. Units can be manufactured in any multiple of the mesh size but are normally. supplied as standard sizes to the industry Welded mesh gabions can be readily modified. on site by cutting the mesh back to the next transverse mesh wire. Welded mesh gabions are available in a number of wire diameters to suit the. application or can be manufactured in a combination of mesh wire specifications to. provide economy in supply, The resultant gabions flexibility is dependant upon the choice of wire diameter. WELDED MESH GABION OPENED GABION FORMED INTO BOX,OUT FLAT PACK SHAPE ON SITE. Woven Mesh Gabions, These gabions are manufactured from a mesh that has a hexagonal opening which is. formed by twisting pairs of wire together with one and a half turns sometimes referred to as. triple or double twist, This type of mesh production is continuous To form panels the mesh is guillotined across.
the weave and the cut ends of the wire are wrapped around a heavier wire to form a. selvedge end, The unit is factory fabricated from one main panel which forms the front base rear and lid. of the unit with additional panels connected to the base section of the main panel to form. the diaphragm and end panels Dependant upon the manufacturer the mesh orientation is. normally either with the weave horizontal or vertical on the face panel and the connection of. the ends and diaphragm to the base is via a spiral wire or pairs of twisted wires twisted. together around the base mesh, This type of mesh is a flexible mesh as it can articulate about the twists It is normally. manufactured from a 2 7mm wire diameter The coatings are either galvanised only. galvanised and PVC coated or galvanised and HDPE coated The dimension between the. twists is a nominal 80mm,HEXAGONAL MESH GABION GABION FORMED INTO BOX. OPENED OUT FLAT PACK SHAPE ON SITE,Woven Mesh Gabion Mattresses. These gabions are manufactured from a mesh that has a hexagonal opening which is. formed by twisting pairs of wires together with one and a half turns sometimes referred to. as triple or double twist, This type of mesh production is continuous To form panels the mesh is guillotined across.
the weave and the cut ends of the wire are wrapped around a heavier wire to form a. selvedge end, The unit is factory fabricated from one main panel which forms the front base rear of the. unit with additional panels connected to the base section of the main panel to form the. diaphragms, The mesh orientation is normally with the weave running along the length of the unit The. lid is supplied as a separate panel, This type of mesh is a flexible mesh as it can articulate about the twists It is normally. manufactured from a 2 0mm wire diameter woven into a 60mm x 80mm mesh The. coatings are either galvanised only or galvanised and PVC coated The dimension. between the twists is a nominal 60mm,GABION MATTRESS FORMED. INTO BOX SHAPE ON SITE,Filling Materials, The selection of rock or stone fill is very important as the performance of gabion structures.
are dependant not only upon the type of unit but also the infill. Gabion units generally used as retaining walls along rivers. Grading of fill, Gabion fill is normally a graded fill of between 100mm to 200mm in diameter with a. nominal 6 of the stone being smaller or larger, The grading can be tightened from 80mm to 150mm providing the control of the. grading is good Stones smaller than the mesh will not be contained by it. The grading is important to ensure that voids within the gabions are minimised. otherwise settlements can occur,Angularity of fill. The more angular the gabion fill the better is the interlock of the stone within the. gabion This results in less deformation of the face and reduced internal movement. under water flow or wave action Limiting the movement of contained stone reduces. the possibility of abrasion to the protected coating. Rounded stone, This has little interlock and results in greater deformation of the face It also means. that the fill within the cell is more fluid and abrasion of the protective coatings to the. wire is more probable, With a rounded fill heavier guage wires are required to reduce the deformation It is.
recommended to use 4 0mm diameter wire for gabion 27 system and 5 0mm wire. diameter for gabion 39 system It is not recommended to use woven wire gabions. manufactured from 2 70mm wire diameter,Crushed concrete. Although angular in shape these do tend to become rounded They do have greater. interlock than rounded stones and therefore 4 0mm welded wire mesh should be. Quarried stone, This is normally angular and is the preferable fill as the interlock is very good. Blocky stone or flat stone, When machined filled these stones can result in large voids being present ultimately. leading to settlements Care should be taken when machine filling to minimise large. Ideally all gabions should be fair faced hand packed on the exposed faces Where the. cost of quarried rock fill is high the gabions can be filled with 2 types of fill a quarried rock. or block stone for the exposed face with a cheaper stone fill behind To assist in placing of. differing fills an additional cell can be incorporated normally set back 300mm from the face. during gabion manufacture to assist in the construction. Filling Materials,Gabion Mattresses, Gabion Mattresses generally used as a sloping revetment along rivers. Grading of fill, Gabion fill is normally a graded fill of between 100mm to 200mm in diameter with.
a nominal 6 of the stone being smaller or larger, The grading is important to ensure that voids within the unit are minimised. otherwise movement of the stone fill can occur,Angularity of fill. The more angular the fill the better interlock and the less possibility of stone. movement within the unit, Limiting possible movement in the contained stone reduces possible abrasion of. the protective coatings,Rounded stone, These have little interlock and therefore stone movement of the fill can occur This. type of fill is not recommended,Crushed concrete, Although angular in shape this fill tends to become rounded and is therefore not.
recommended,Quarried stone, This is normally angular and is the preferred fill as the interlock is very good. Blocky stone or flat stone, This is not suited to gabion mattresses as large voids can be present resulting in. stone movement,Design Mattress Protection, Gabions used as retaining structures along water courses or as headwalls require. designing to resist the soil and external forces Please refer to Volume 1 A Reference. Guide for the Designing of Mass Gravity Gabion Walls for the design procedures. The designer should be aware of the potential for the retained soils to be saturated after. flood conditions in the water course or from the effects of tidal flows For saturated soils. the design density is taken as the saturated density and it is recommended that the phi. value be reduced to 70 of its normal value, Wherever gabions are used in a water environment a non woven type of geotextile. should be placed behind and below the gabion structure. For gabion mattresses used as either channel linings sloping revetments bed. protection or scour protection the design is empirical and based on historical use The. purpose of the mattress is to reduce the water velocity of the stream as the depth. increases so that at the interface with the bed the velocity is such that it will not displace. the soil particles As a precautionary measure a geotextile separator membrane with a. pore size smaller than the soil particle size should always be placed below the mattress. It is normally recommended to use a non woven type of geotextile. The following table gives typical unit depth requirements for soil types and water velocity. laminar turbulent flow conditions and where eddie currents exist. Determination of gabion mattress depths,Flow Water Unit depths m.
Conditions Velocity,Fine grained Cohesive Coarse grained. m s soils soils soils,Laminar Flow 0 to 2 0 23 0 23 0 23. 2 to 4 0 3 0 23 0 23,4 to 6 0 5 0 3 0 3,6 0 5 0 45 0 5. Turbulent Flow 0 to 2 0 3 0 3 0 23,2 to 4 0 3 0 3 0 3. 4 to 6 0 5 0 5 0 5,6 0 5 0 5 0 5,Locations where 0 5 0 5 0 5.
eddies and 0 5 0 5 0 5,whirlpools occur 0 5 0 5 0 5. Note Where mattress unit depths are 0 5m the mattress units are formed from 0 5m. deep Gabions,Sloping Revetments,Water Courses See Drawing REVET 1. Volume 3 A Reference Guide for the Designing of River and Coastal Gabion Protection Works Designing with Gabions amp Mattresses Registered Office Unit 5 The Cobden Centre Folly Brook Road Emerald Park Emersons Green Bristol BS16 7FQ Enviromesh is a trading name of Cerana Limited

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