MONITORING SOLUTION PROVIDERS PTE LTD

BRIDGE MONITORING

Opened in 1981, the Benjamin Sheares Bridge is the longest bridge in Singapore, spanning 1.8 km, and the tallest, at 20 m. It is named after Dr Benjamin Henry Sheares, the 2nd president of the Republic. The bridge is part of the East Coast Parkway. The cost of construction was S$177 million. Built over reclaimed land, the bridge is made of pre-stressed concrete and links East Coast Parkway on the east coast to Marina Bay on the west coast.

Picture 1: Benjamin Sheares Bridge

The Marina Bay Bridge across Marina Bay was officially opened on 24 April 2010. There are two components to the new bridge – a six-lane vehicular connection and a six-metre wide curved pedestrian connection that embraces Marina Bay. The Helix, at 280m long, was chosen for the spiral-shaped pedestrian bridge while the Bayfront Bridge, spanning 303m, was picked for the parallel bridge for vehicles.

Picture 2: Helix Bridge

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The Bayfront Bridge is a vehicular bridge part of the Bayfront Avenue which links the Marina Bay Sands Integrated Resort to Raffles Avenue at the junction with Temasek Avenue. Its simple design blends in with the existing Benjamin Sheares Bridge to form a backdrop to The Helix Bridge. The bridge provides a direct connection between Marina Centre and Marina South. The opening of this new road network will provide road access to the upcoming developments in the Marina Bay area, such as the Marina Bay Sands Integrated Resort (MBSIR), Gardens by the Bay and the Marina Bay Financial Centre (MBFC).

Picture 3: Bayfront Bridge

Monitoring Solution Providers Pte Ltd was involved in monitoring the movement of the Benjamin Sheares Bridge and later, the Bayfront Bridge under Land Transport Authority Contract 905.

Zone of Proposed Monitoring C905 Tunnel

Contract 905 is for the design, construction and completion of tunnels between Promenade

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Station and Marina Bay. It includes two pairs of stacked bored tunnels between the Marina Bay Sands Integrated Resort (MBSIR) development and Promenade interchange station for the Circle Line (CCL) and DTL Stage 1.

DESIGN CRITERIA

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• Distance of the monitoring points to the total station to be kept below 250 m to achieve the required accuracy when monitoring under harsh environment. eg (Hot afternoon sun and the shimmering effects of the water body at sea).

• The Measurement Station deployed must have 1” accuracy in angular measure and 1+1pmm accuracy for distance measurement.

• Equipment/Measurement Station to be used must also have high ratings in dust and water protection.

• Power consumption of all equipment used must be kept to the minimum due to the lack of constant power supply.

The proposed Downtown Line MRT construction C905 is in close vicinity of the existing Benjamin Sheares Bridge and an Automated Deformation Monitoring System (ADMS) was deployed for structural deformation and displacement monitoring of the bridge during the construction of the project. The installation and monitoring of this system will progress in two (2) phases to accommodate the construction sequence of the civil contractors.

Phase 1 – Pier 1A to Pier 8A (installed on 28 March 2008) Phase 2 – Pier 9A to Pier 22 (to be installed in late April 2008)

The system configuration for phases 1 & 2 is such that phase 1 is a standalone system with its own stable reference points. On the other hand, phase 2 being introduced on a later date will be linked to phase 1, for transferring its reference points to stable areas.

PROPOSAL The instruments used for phase 1 & 2 automated monitoring are:

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Phase 1: 1 nos. of Sokkia NET1-m total station; 29 nos. of monitoring prism; 2 nos. of 360 o prisms for monitoring and future connection to phase 2 monitoring system

Phase 2: 2 nos of Sokkia NET1-m total station X nos of monitoring prism

INSTRUMENT SETUP (STN1) was installed on the bridge column that is within the C905 site office

(STN2 & STN3) were installed on the pile caps of the bridge column that is within the Marina Bay channel

MONITORING PRISM

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RAPID INTELLIGENT UNIT

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Station 1 – Rapid IU (Type 2) Rapid IU with Power and Data control system, housing the PC with installed RAPID-PC software dictating the monitoring process of the NET1-m and sending the monitoring data to Office for processing.

Station 2 & 3 – Rapid IU (Type 1) Rapid IU with Power and Data control system, housing the Ruggedized PDA (built-in GSM) with installed RAPID-WM software, dictating the monitoring process of the Station 2 & 3 NET1-m. Upon completion of each monitoring cycle, the RAPID_WM automatically activate its GPRS connection to transmit the data to the HQ Server for processing

C905 – PROCESSED DATA Processed data from the monitoring site can slso be viewed and downloaded from the Internet

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Changes in Height Coordinates at Office (STN1)

4.0

3.0

2.0

1.0 R12-dRL(mm) 0.0

-1.0

-2.0

-3.0 -4.0

ChangesHeight in Coordinates (mm)

22-May-03 23-May-03 Date and Time

The Automated Deformation Monitoring System (ADMS) was officially commissioned 23 rd April 2008.

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C905 SITE PHOTO

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C905 SITE PHOTO

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C905 SITE PHOTO

MONITORING SOLUTION PROVIDERS PTE LTD 33 Ubi Avenue 3, #05-31, VERTEX Singapore 408868 Tel: +65 – 67479766 Fax: +65 – 6458 0824 E-mail: [email protected] Website: www.mspsystem.com Co. Reg No: 200210421W

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