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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP Redaction Date Approval Rév. S.LUPI 07/04/2015 G. BOMBEN 1

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIPRedaction DateApproval Rv.S.LUPI07/04/2015G. BOMBEN 1

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORED RUBBER GASKET UG027AWITH HYDROPHILIC STRIP

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

GLUED GASKETSANCHORED GASKETS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIIP

CHARACTERISTICS OF RUBBER

The rubber is a flexible material and non-compressible.

Max compres. Relax Max flex. h 6 mm h 10 mm h 40 mm

For this reason, in the course of time, the form of hydraulic gaskets gradually has undergone conceptual changes to its shape. It has gone from forms that included a deformation in compression alone to forms that use in form also increasing elongation.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

RUBBER GASKETS FIRST GENERATIONCOMPRESSIVE DEFORMATION

Slight changes in shape and hardness of gasket, cause high variations of compression.Rapid drop of tightness performancesHigh stress conditions in the connection systemHigh reaction forces for closed gapsCONS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

DEVELOPMENT THE SECOND GENERATIONSTEP COMPLICATED

Forms apparently similar during compression behave a completely different wayThe evolution of the gasket from the first to the second generation is particularly complex

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

RUBBER GASKETS SECOND GENERATIONSEPTA DEFLECTION GASKET

SEPTA DEFLECTION GASKET

CONSPROSImproves the compression behaviour Lower forces for the closed gap.Better hydraulic performanceRemains a certain instabilityNeed for a taller gasket profile to mantain good watertightness performances.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

SECOND GENERATION GOOD SOLUTION

Good contact between the groove flanksContact surfaces between the rubber gaskets even.Instability of the upper part

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Bad contact between the groove flanksContact surfaces between the rubber gaskets neither even or flatGeneral instability

SECOND GENERATION BAD SOLUTION

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Better behaviour in compression and in relaxationHigher stability to the tightness performancesNo stress in the connection systemsHigher stability to compressionLower forces for the closed gap

RUBBER GASKETS THIRD GENERATIONFOLDING GASKET BY COMPRESSION

PROS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Good contact with groove flanksContact surfaces between the rubber gaskets even.Perfect gasket foldability and no instability.

RUBBER GASKETS THIRD GENERATIONFOLDING GASKET BY COMPRESSION

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANALYSIS OF GLUED GASKETS APPLICATION ON CONCRETE SEGMENTS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Bonding quality process which provides for the punctual control of these procedures, is usually entrusted to the care, accuracy and perseverance of the site operators. Generally this is an high risk factor

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Note: the white cross hatch was made on the profiles prior to the simulation test in order to show more clearly the effectsDISPLACEMENT BEHAVIOUR OF THE FRAME CORNER

1

2

3Expulsion of the corner gasket from its groove due to the compression exerted by the erected segment.Unbonding of the rubber gasket due to the reaction forces by the concrete segment during its erection.Higher deformation of the gasket frame corner.MAIN CONS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Corner geometry perfectly fits to the concrete segment

MEASURES TO IMPROVE THE HYDRAULIC WATER TIGHTNESS OF GLUED GASKETS Acute and oblique cornerObtuse and oblique corner

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Corner geometry perfectly fits to the concrete segment

Good fittingBad fitting

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

GLUED GASKETSANCHORED GASKETS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANALYSIS OF ANCHORED RUBBER GASKET UG027A

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORING OF RUBBER GASKET TO CONCRETE.RUBBER GASKETS FORTH GENERATION

This technological innovation allows to increase in a relevant way the quality of the produced parts but also to significantly reduce the manufacturing costs.

Installed in the 4.1m diameter TBM tunnel that brings two sets of cables from Sicily to the mainland under the sea (Scilla Tunnel)

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

+

=

Scilla TunnelVancouver Evergreen Line

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORING OF RUBBER GASKET WITH HYDROFILIC STRIPTO CONCRETE. RUBBER GASKETS FIFTH GENERATION

This technological innovation allows to increase in a relevant way the quality of the produced parts but also to significantly reduce the manufacturing costs.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORING OF GASKET WITH HYDROPHILIC STRIP TO CONCRETERUBBER GASKETS FIFTH GENERATIONGood contact with groove flanksContact surfaces between the rubber gaskets fully even.Perfect gasket foldability and no instability.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

The gasket maintains a good contact between the surfaces and a proper crushing also to offset 10

ANCHORING OF GASKET WITH HYDROPHILIC STRIP TO CONCRETERUBBER GASKETS FIFTH GENERATION

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

The gasket maintains a good contact between the surfaces and a proper crushing even if accidentally missing the hydrophilic cord

ANCHORING OF GASKET WITH HYDROPHILIC STRIP TO CONCRETERUBBER GASKETS FIFTH GENERATION

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

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ANCHORED RUBBER GASKET UG027AWITH HYDROPHILIC STRIP

The labyrinth shape of the anchoring part assure an high resistance to the water infiltrationsThe concrete makes an imprint that perfectly replicate the gasket anchoring feets geometry without gap or air inclusions

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ANCHORED RUBBER GASKET UG027AWITH HYDROPHILIC STRIP

ADVANTAGES OF THE RUBBER GASKET UG027A

PROSGuaranteed and remarkably higher adhesion between gasket and the concreteEnsure that during concrete segments assembly, rubber gasket isnt being expelled from its groove particularly in the corner zoneHigher hydraulic tightness due of the increasing distance for the water between gasket and concrete.

QUALITY

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ANCHORED RUBBER GASKET UG027AWITH HYDROPHILIC STRIP

PROSShortened process in the precast factory due to time savings for correction of imperfections and cleaning of the groove areaReduced assembly time of the gasketSaving costs for glue and glueing equipment

TIME SAVING

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ANCHORED RUBBER GASKET UG027AWITH HYDROPHILIC STRIP

PROSNo environmental pollution associated with the use of solvent in the glue.

ENVIRONMENTAL

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANCHORED RUBBER GASKET WITH HYDROFILIC STRIP: SELF REPAIRDuring concrete segment assembly there could be the following actions:

Anomalous deformations of the gasketGap and offsets higher than required in the technical specification and for which the gasket is being designedTherefore rubber gasket should work in unplanned conditions causing water infiltrations. To overcome this situation, is being added to the rubber gasket a hydrophilic part which swell when in contact with the water.The swelling action allows the recovery of the abnormal gaps and the reinstatement of the sealing.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

ANALYSIS OF ANCHORED RUBBER GASKET UG027AWITH HYDROFILIC STRIP: TECHNICAL FEATURES (STUVA Method)

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

Cross sectiona=274 mm (including swelling strip 5)b=57,5 mmCompoundEPDM 70 Shore AGroove width at bottom26 mmGroove depth10 mmGroove angle15Groove dimension286,8 mmAt full compression the groove is used at 95%

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

RUBBER COMPOUND TECHNICAL DATA SHEETDESCRIPTIONCompound codePGSA70 or similarCompound typeEPDM BLACK

TESTTEST METHODU.M.VALUE STUVAHardnessDIN53505Shore A70N.V. 5Tensile strenghtDIN53504(S2)Mpa9,7 9ElongationDIN53504(S2)%350 200Residual pressure deformation DVR22h at 70CISO 815A%19 25Ozone resistanceISO1431-1-No cracksnot requiredUV resistance---not requiredThermal ageing 168h a 70CChange in hardness DIN53505%+3%da -5% a +8%Change of crack resistanceDIN53504(S2)%+3da -20 a +10Change of elongationDIN53504(S2)%-15da -30 a +10Stress relaxation 3 months at 70CISO3384%42 45Restorative capacity at 20CSTUVA%91 80Fire resistanceDIN4102-1Class B2not requiredOperating temperature-C-40/+100not required

PHYSICAL FEATURES

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

WATERTIGHTNESS TEST RIG

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

WATERTIGHTNESS DIAGRAM FOR UG027A

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

LOAD DEFLECTION DIAGRAM FOR UG027A

UG027AUG027A

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

STRESS RELAXATION TEST ACCORDING TO STUVA RECOMMENDATIONSfor ANCHORED EPDM GASKET UG027A

UG027A

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

4 mmPRESENTATION OF THE CORD HYDROPHILIC ACTION

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

HYDROPHILIC SWELLING STRIP: MAXIMUM SWELLING

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

HYDROPHILIC SWELLING STRIP: EXPANSION PRESSURE/TIME IN CONCRETE WATER

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

TECHNICAL IMPLICATIONS OF EPDM GASKET AND HYDROPHILIC SWELLING STRIP AT THE DOHAS SPECIFIC WATER CONDITIONS

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

The concentrations of chlorydes and sulphates in the Dohas water do not influence the performance of EPDM.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

FULFILLMENT OF THE SPECIFICATIONS REQUIREMENTS

Hydrophilic anchored rubber gasket UG027A has the features that fulfill specifications requirements.

Water resistance up to 4 bar external water pressure (considering the maximum of 38 m waterhed to the tunnel crown );26 mm gasket groove width at bottom and 17 mm gasket height;Max gasket compression force: 45 kN/m at 0 mm gap;Safety factor of 2,5 for the long-term loads.Gasket made with EPDM compound;Gasket tollerances according to UNI EN 3302-1 Class E2;120 years long term life estimation gasket according to standards ISO 11346 ( Stuva recommendations ) and ISO 3384;Resistance to Dohas water conditions.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

CONCLUSIONS

EPDM rubber gasket is suitable for Dohas Red Line North Underground.

Hydrophilic swelling strip is suitable for Dohas Red Line North Underground.

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ANCHORED RUBBER GASKET UG027A WITH HYDROPHILIC STRIP

THANK YOU FOR YOUR ATTENTION

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