SBH Shoring System for MBMC Sewerage Project

SBH Shoring System for MBMC Sewerage Project

SBH Shoring System for MBMC Sewerage Project
The Mira-Bhayandar Municipal Corporation (MBMC) awarded a contract to SPML Infra Ltd for underground sewerage in Mira-Bhayandar city in Thane, Maharashtra under JNNURM few years ago. The scope of project included sewage collection and conveyance system, sewage pumping stations, accepted treatment plants, treated sewage outfalls and other miscellaneous works. The project need was envisaged to control the environmental pollution & epidemics, to improve environmental hygiene by proper disposal of waste water and to eliminate septic system in order to reduce soil & sub soil water pollution.

While developing the project the entire Mira-Bhayandar has been divided into 10 Zones and in each zone independent Collection System, Sewage Treatment Plant (STP) and Outfall is provided with total 120 Km length of collection system, besides 115 MLD of STP capacities (10 nos.) and 5.6 Km length of Outfall.

The special feature of this project is that in India decentralized scheme has been executed for the first time. The sewage treatment plants in residential areas are with new modern MBBR technology which require less power consumption and fewer footprints than conventional sewage treatment plants. The STP is SCADA based operated from a master control room. Besides these features, the additional benefit is that the treated effluents can be reused for gardening and construction purpose by the MBMC.

As Mira-Bhayandar City is surrounded by creek from 3 sides and land is filled-up and proportion of reclamation land is maximum, so during excavation land collapses and landslides are observed frequently. Other than this as ground Water Table of the area is at shallow depth hence heavy dewatering is required. The area is almost at one level so the depth of the Underground collection system has to lay at greater depth ranging from 2.5 mts to 8 mts.

Considering these problems associated with the project where great support is needed through shoring in order to prevent collapse, SBH Shoring system is selected by the project developer SPML.

SBH Shoring System for MBMC Sewerage Project
Speaking about the selection of SBH shoring system for the project, Mr. Dada Sahed Chandane, Project Director who is involved with the project for the past two & half years said, “Basically Mira-Bhayandar is reclaimed slushy area adjacent to sea-shore where creeks intrude the reclaimed land. The creeks are flooded twice a day, during high tide. Hence entire sub base below top refill which is slush remains in saturated condition. It is observed from the excavated muck that this slush never dries more than 100m exposed top layer to ambience for days. Over and above this open cut unlined storm water drains, leaking RCC drains contribute to slush saturation below one meter depth which leads to unstable, sliding, collapsible, and boiling soil trenches.”

With this type of soil conditions, the timber shoring option was sidelined due to certain reasons as for example it cannot be removed and has to be ‘leave in’ and most importantly, it is not economical and eco-friendly to use. Though it can be left in to avoid the fatal accidents while removing it; the probability of fatal accidents while fixing the timber shoring in slush remains intact. The gaps in timber shoring lead to heavy percolation which resulted in higher cost of dewatering and longer time of construction.

Other alternatives available in India are Sheet piling and Trenchless techniques, but due to their heavy cost, they were also not considered. SPML infra quest for cost-effective and time saving methods ended when they came across SBH, the manufacturer of metal shoring equipment which has vast experience, capacity, and fantastic after sales service facility.

SBH Shoring System for MBMC Sewerage Project
Elaborating on the quality and functioning of the products Mr. Chandane said that SBH develops practical solutions to shoring requirements with the depth of 2.4 meters to 10 meters and width could be upto 12 metres. The equipment are rugged, long lasting, save immense time at the construction site, and is economical too. The company offers various models, suitable to different site conditions, at various depths. Safe working practices and accident prevention are ensured by correct choice of equipment for the project.

He further said that when it is compared from safety point of view, SBH shoring has helped us in achieving the target constantly without fatal accidents. In comparison to ‘leave in’ closed timber shoring sheet piling trenchless technology, SBH shoring is cost effective. Although the initial investment is more here compared to investment for timber shoring and big excavator of 30 tons is required for fixing and removing but it offers multiple benefits including giving increased efficiency in terms of time saved and productivity per day and requires less labor if compared to timbering or sheet piling.

Mr. Chandane concluded saying that without discovering the latest SBH Technology made in Germany, our projects would have been very much delayed and we are extremely happy that we are now a leading benchmark and example of state-of-the-art trench shoring in India. We hope that other contractors will follow our example to raise India´s shoring standards and avoid fatal accidents and have dramatic increase in completion time of the sites.

Using SBH is now like driving with a motorcycle rather that still using a donkey cart – India wants to be a technologically advanced country. So even in shoring technology, one should make use of the productivity improvements by using SBH solutions which signify speed, performance, efficiency and safety.

NBMCW June 2012

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