The flow chart below shows the flow of energy, water, and material input and waste, water, CO2 , and material output from Shimizu's office and construction activities.
Proper Processing of Waste
Countermeasures for Construction By-products
In addition to the dirt and sludge that is generated at building and civil engineering job sites, by-products such as steel, concrete, and glass from dismantling existing structures are also generated. Reducing the volume of these by-products and recycling them is an important mission for construction companies. Shimizu therefore engages the entire company in promoting "4R" activities (refuse, reduce, reuse and recycle).
Total Emissions Volume, Final Disposal Rate, and Total By-products Generated Per Square Meter
The results for fiscal 2016 are shown below.
We far surpassed our goal, thanks to the results from large construction projects in the metropolitan area.
- Total volume generated:2.07million tons (−4% YoY)
- Volume generated (excluding sludge):1.28million tons
- Final disposal rate:3.7％
[/4.0% or less]
- Total by-products generated per square meter:13.0kg/m2
Effective Use of Resources at Job Sites
Shimizu is working to reduce the volume of construction by-products generated per unit and the final disposal rate. A construction by-products forecasting system is used in by-product reduction and recycling initiatives.
A notable example of this is how Shimizu promoted 100% effective use of the rails, railroad ties, and ballast (crushed rock bed) that were uprooted by the debris flow caused by torrential rains in northern Kyushu at the Sakanoue tunnel disaster recovery project site (Kyushu Branch) located on the JR Kyushu Houhi Line. Shimizu received awards for this project in fiscal 2015, among them the 3R Contributor Award.
Shimizu strives to manage pollution prevention properly as an important task of management.
We take definitive steps to prevent pollution from the asbestos exposed during dismantling and renovation. A notable example of this is ASP method* that Shimizu developed and uses to remove asbestos, which easily becomes airborne. Shimizu is the only major general contractor in Japan that has a certified method for this process that it developed itself.*
Certified by the Building Center of Japan (BCJ)
Shimizu developed and uses the S-DA method for remediation of contamination from dioxins.
Shimizu developed and uses the Cool Cut method to control the generation of noise, vibration, and dust in the construction dismantling process.
We store PCB waste properly at our company, are systematically working with JESCO to neutralize it to render it harmless.
In fiscal 2015, 802 tons of dispersal fibrous asbestos was removed during dismantling and renovation construction activities. Shimizu properly disposed of all of this without incident, and melted approximately one-third of it, rendering it completely harmless.
Shimizu has developed various kinds of proprietary technology and is actively using these in asbestos remediation. These technologies include the ASP method, a highly effective removal method; Shico, a type of reduction equipment; FS-1, a real-time measuring device; technology for diagnosing degradation of asbestos; and Astector, an agent that prevents asbestos from scattering. surveyors of asbestos-containing construction materials in structures.
PCBs, CFCs, and Halons
Shimizu was storing the following PCB waste as of the end of fiscal 2016. We are discussing this with the candidate processing subcontractors and intend to finish processing to render it harmless by fiscal 2020.
|10 units||248 units||2,039 units||72 drums|
In regard to the types of CFCs used in the machinery we manage, we perform inspections and surveys as specified in the amended Act on Recovery and Destruction of Fluorocarbons, and have verified proper management.
Policy on Resource Conservation
To conserve resources, Shimizu actively employs industrialized construction methods and reuse of formwork, and is promoting pre-cut construction methods and unpackaged transport.
To coexist harmoniously in the local community, we provide unneeded used cardboard to the town, set up recycling stations, and provide the by-products (left-over usable construction materials) to the public. Our active efforts to reduce and reuse has enabled Shimizu to achieve the best results in the industry for the by-products intensity from new construction, at 16 kg/m2 or lower.
Lifecycle Analysis of Product and System Design
Shimizu uses a construction by-products forecasting system and front-loading from the design stage as part of the PDCA cycle for reducing waste.
Description of Initiatives in Resource Conservation
Exhibition Hall Built for Easily Removable 100% Recycling
In this project, we diligently engaged in 3R activities (reduce, reuse, and recycle) for building dismantling and removal from the design and construction stage. In the construction stage, we used the steel pipe pile rotation and press fit method or our patented pile head ring socket construction method. We also used recyclable materials for the exterior materials. We used precast concrete for the framework and unitized equipment during the construction stage, simplified packaging, and sorted waste. We planned and implemented a 4D process using BIM, and employed environmentally friendly methods in the dismantling work as well.
Shimizu received a contributor's award for promoting the 3Rs (reduce, reuse, and recycle) in fiscal 2017 for our work on building the Tokyo Big Site East temporary exhibition hall (Tokyo Branch).
Preventing Water Pollution and Effective Use of Water Resources
Preventing Water Pollution
We work hard to prevent water pollution during construction by providing a Manual on Preventing Water Pollution at Job Sites, conduct e-learning courses, and holding meetings for the construction managers at each branch. We also implement various initiatives during Water Pollution Preventing Awareness Month in June of each year.
Effective Use of Water Resources
Shimizu engages in systematic efforts to improve water use efficiency and mitigate or prevent a negative impact. Below are several examples of specific initiatives.
Water sprinkling to prevent dust
In cases where construction involves dismantling a building and requires sprinkling water to prevent dust, we reduced tap water usage by reusing the water that had collected in the underground spring pit during dismantling.
Reuse of processing water in underground pits
In cases where contaminated soil was excavated in underground pits and carried out, we initially used tap water to clean the pit after excavation and transport vehicle tires, but reduced water usage by treating water with water treatment equipment and recycling the treated water confirmed to meet the proper standards.
Use of recycled water in tunnel construction
We also reduce use of water in tunnel construction by reusing spring water that had been treated at a turbid water treatment plant.
Business Activities Overseas in Arid Regions
■Project Involving Produced Water in Oil Production: Generating New Water Resources
Produced water from oil production refers to the groundwater that wells up during oil drilling. The amount of water produced ranges from three to six times the amount of oil produced. In Oman, there are areas where one oil field generates 200,000 m3 of produced water a day, more than half of the potable water supply for Muscat, the capital of the country.
Produced water contains oil and hazardous heavy metals that are extremely difficult to remove. Treatment is difficult and nearly all of the produced water is returned, unused, to the subterranean mine, at present. In order to create a new water resource from this produced water, Shimizu working with JCCP (Japan Cooperation Center Petroleum), Sultan Qaboos University, the Oman Ministry of Oil & Gas, and others on developing highly efficient produced water treatment technology that is simple and can be used for general purposes. In order to effectively use produced water that has been treated, Shimizu is working with the Oman Ministry of Agriculture & Fisheries on exploring what types of plants can be cultivated using irrigation with producible water of different quality levels. We are also exploring seaweed production that makes use of the climate and vast expanse of land.