CASE HISTORY-

VERIFICATION IN EXECUTION OF SYSTEM

PERFORMANCE OF CONNECTION AND GASKET

Issue Date Check Project Rev.

S.LUPI 10/09/2014 G. BOMBEN METRO BLU 0

CASE HISTORY

INTRODUCTION

Fama Spa is an Italian company operating since 1988 in design, certification,manufacture of products for precast lining of tunnels.

Fama Spa is specialized in the development of sealing systems and a widerange of accessories for the connection, lifting and anchoring systems forthe construction of tunnels with TBM.

For the excavation of the line M4 - Route EXO, FAMA SpA provided gasketsand connection systems.

To complete a strategic path that began with the design and continued withthe certification through laboratory tests, with a campaign ofmeasurements, it was possible to document the performance of theseproducts in exercise.

CASE HISTORY

METRO MILAN - LINE M4 – Section EXPODESIGN OF THE LINING

- UNIVERSAL RING 5+1- KEY 1/3 OTHER SEGMENT- EX. DIAMETER 6.060 mm- IN. DIAMETER 5.500 mm- THICKNESS OF CONCRETE 280 mm- LENGTH OF CONCRETE 1.400 mm

- GASKET 29 x 14 mm- 16 CONNECTOR FOR RING

(3 FOR EACH SEGMENT , 1 FOR THE KEY)

- GUIDE ROD

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METRO MILAN - LINE M4 – Section EXPOHYDROGEOLOGICAL PROFILE

- FULL TRACK UNDER THE WATER TABLE- WATER PRESSURE 2.1 BAR

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EPDM SEALING GASKET

- UG022A- 29 x 14 GLUED- PRESSURE REQUIRED TO CONTRACT GAP 4 mm OFFSET 12 mm 13 BAR

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CONNECTION SYSTEM

- SMARTBLOCK 60-180/300-80- PULL OUT 60 KN- SHEAR STRENGTH 160 KN- LENGTH 300 mm- DIAMETER OF CENTERING 80 mm

CASE HISTORY

1. We want to calculate the current state of misalignment and separation of the joints between thesegments in the gallery;

2. The relief is performed with the use of two measurement gauges: one for the depth, with whichrecalculate the offsets and one for the width of the slots for the recalculation of the gap;

3. The joints are first classified according to the orientation angle to the progress of the excavation;

4. Usually the relief is performed on a continuous succession of five joints, reached by the operatorthat runs through the tunnel by foot. In case of severe anomalies the relief can be conducted on theentire ring with the aid of suitable lifting equipment. The measuring block 5 of joints may, at theoperator's discretion, be repeated several times;

5. The sequence of measurements, if necessary, can be performed on the right side and on the left sideof the tunnel with reference to the direction of advance of the excavation;

6. May be conducted in the presence of detections punctual infiltration of water, in order to evaluate ifthis is generated by an excessive misalignment, or spreading of the coupling or, finally, from othercauses;

7. If necessary measurements can be performed on the blocks, facing the opposite of progress tocompare with those initial misalignment stabilized along the tunnel.

PROCEDURE FOR DETECTION GAP AND OFFSET BETWEEN THE JOINTS IN CONCRETE INTO THE TUNNEL

CASE HISTORY

PROCEDURE FOR DETECTION GAP AND OFFSET BETWEEN THE JOINTS IN CONCRETE INTO THE TUNNEL

The measurements of gap and offset are performed at approximately 20mm from the T joint, where the deviations from nominal are maximums.

CASE HISTORY

PROCEDURE FOR DETECTION GAP AND OFFSET BETWEEN THE JOINTS IN CONCRETE

In the diagrams below are identified types of angles between segments of a same ring adjacent each other refer to the direction of excavation.

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PRESENTATION OF RESULTSMEASURES OF GAP IN THE CIRCUMFERENTIAL JOINTS

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PRESENTATION OF RESULTSMEASURES OF GAP IN THE LONGITUDINAL JOINTS

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PRESENTATION OF RESULTSMEASURES OF OFFSET IN THE CIRCUMFERENTIAL JOINTS

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PRESENTATION OF RESULTSMEASURES OF OFFSET IN THE LONGITUDINAL JOINTS

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PRESENTATION OF RESULTSPICTURES OF THE TUNNEL

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ANALYSIS OF THE RESULTSASSESSMENT OF THE EFFICIENCY OF THE CONNECTION SYSTEM

There have been 205 measurements of gap and offset.

The average weigth gain of the gap is 0.5 mm, the offset of 1.4 mm.

The requirements of the specifications of the project M4 Milan provide amounting tolerance of 4 mm on the opening of the joint (gap) and 12 mm on themisalignment of the joint (offset). The connection system SmartBlock allowed amounting error is much lower than expected.

The connection system SmartBlock has minimized the effect of the divergence ofthe longitudinal and circumferential joints generated by the thrust of the gasket.

The performance of the pull-out and shear of the SmartBlock are suited to theconditions of employment, ensuring the correct dimensioning of the system.

CASE HISTORY

ANALYSIS OF RESULTSASSESSMENT OF THE EFFICIENCY OF THE SEALING GASKET

The gallery of the Milan line M4 is dry.

The gasket sealing UG022A has been tested at the University Tor Vergata forthe hydraulic performance requirements in the specifications of the project M4in Milan.

The gasket UG022A requires a load of 42 KN/m for its complete compressionfacilitating, in fact, the permanence of the closed joint.

The geometry of UG022A well balanced between width and height andangles conformed to the geometry of the concrete allow, during assembly ofthe ring, to remain in its seat.

CASE HISTORY

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