Case history milan line m4 route expo en rev.1
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CASE HISTORY MILAN-LINE BLUE - VERIFICATION IN EXECUTION OF SYSTEM PERFORMANCE OF CONNECTION AND GASKET Issue Date Check Project Rev . S.LUPI 10/09/201 4 G. BOMBEN METRO BLUE 1
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Transcript of Case history milan line m4 route expo en rev.1
CASE HISTORYMILAN-LINE BLUE
-VERIFICATION IN EXECUTION OF SYSTEM PERFORMANCE
OF CONNECTION AND GASKET Issue Date Check Project Rev.
S.LUPI 10/09/2014 G. BOMBEN METRO BLUE 1
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 wide range of accessories for the connection, lifting and anchoring systems for the construction of tunnels with TBM.
For the excavation of the line M4 - Route EXPO, FAMA SpA provided gaskets and connection systems.
To complete a strategic path that began with the design and continued with the certification through laboratory tests, with a campaign of measurements, it was possible to document the performance of these products in exercise.
CASE HISTORY
METRO MILAN - LINE M4 – Section EXPODESIGN OF THE PRECAST RING
- UNIVERSAL RING 5+1- KEY 1/3 OTHER SEGMENT- EX. DIAMETER 6.060 mm- IN. DIAMETER 5.500 mm- THICKNESS OF SEGMENT 280 mm- LENGTH OF SEGMENT 1.400 mm
- GASKET 29 x 14 mm- 16 CONNECTORS FOR RING (3 FOR EACH SEGMENT, 1 FOR THE KEY)- GUIDE ROD ON THE RADIAL JOINT
CASE HISTORY
METRO MILAN - LINE M4 – Section EXPOHYDROGEOLOGICAL PROFILE
- FULL TRACK UNDER THE WATER TABLE - MAXIMAL WATER PRESSURE 2.1 BAR
CASE HISTORY
EPDM SEALING GASKET
- UG022A- 29 x 14 GLUED- SPECIFICATIONS REQUIRED TO
CONTRACT PRESSURE 13 bar GAP 4 mm OFFSET 12 mm
CASE HISTORY
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 the segments in the gallery; 2. The relief is performed with the use of two measurement gauges: one for the depth, with which recalculate 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 operator that runs through the tunnel by foot. In case of severe anomalies the relief can be conducted on the entire ring with the aid of suitable lifting equipment. The measuring block 5 of joints may, at the operator's discretion, be repeated several times; 5. The sequence of measurements, if necessary, can be performed on the right side and on the left side of the tunnel with reference to the direction of advance of the excavation; 6. May be conducted punctual detections in the presence of water infiltration, in order to evaluate if this is generated by an excessive misalignment, or spreading of the coupling or, finally, from other causes; 7. If necessary measurements can be performed on the blocks, facing the opposite of progress to compare with those initial misalignment stabilized along the tunnel.
PROCEDURE FOR DETECTION GAP AND OFFSET OF THE JOINTS BETWEEN THE SEGMENTS INTO THE TUNNEL
CASE HISTORY
PROCEDURE FOR DETECTION GAP AND OFFSET OF THE JOINTS BETWEEN THE SEGMENTS INTO THE TUNNEL
The measurements of gap and offset are performed at approximately 20 mm from the T joint, where the deviations from nominal are maximums.
Measurement scheme of
GAP
Measurement scheme of
OFFSET
CASE HISTORY
PROCEDURE FOR DETECTION GAP AND OFFSET OF THE JOINTS BETWEEN THE SEGMENTS INTO THE TUNNEL
In the diagrams below are identified types of angles between segments of a same ring adjacent each other refer to the direction of excavation.
CASE HISTORY
PRESENTATION OF RESULTSMEASURES OF GAP IN THE CIRCUMFERENTIAL JOINTS
CASE HISTORY
PRESENTATION OF RESULTSMEASURES OF GAP IN THE LONGITUDINAL JOINTS
CASE HISTORY
PRESENTATION OF RESULTSMEASURES OF OFFSET IN THE CIRCUMFERENTIAL JOINTS
CASE HISTORY
PRESENTATION OF RESULTSMEASURES OF OFFSET IN THE LONGITUDINAL JOINTS
CASE HISTORY
PRESENTATION OF RESULTSPICTURES OF THE TUNNEL
CASE HISTORY
ANALYSIS OF THE RESULTSASSESSMENT OF THE EFFICIENCY OF THE CONNECTION SYSTEMThere 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 a mounting tolerance of 4 mm on the opening of the joint (gap) and 12 mm on the misalignment of the joint (offset). The connection system SmartBlock allowed a mounting error is much lower than expected.
The connection system SmartBlock has minimized the effect of the divergence of the 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 the conditions 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” in Rome – Department of Civil Engineering – Structures and Material Tests Laboratory - for the hydraulic performance requirements in the specifications of the project M4 in Milan.
The gasket UG022A requires a load of 42 KN/m for its complete compression facilitating, in fact, the permanence of the closed joint.
The geometry of UG022A well balanced between width and height and angles conformed to the geometry of the segment allow, during assembly of the ring, to remain in its seat.
CASE HISTORY
THANK YOU FOR YOUR ATTENTION
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