Resource Recycling and Preventing Environmental Pollution

Resource Recycling and Waste Reduction

Reducing the Volume of Construction By-products and Recycling Resources

Construction by-products generated during construction work include sand and other soil generated during construction and debris, metal, glass, and other materials generated during dismantling of a facility. These by-products are divided into recyclable resources and waste. Reducing the volume of such by-products and turning them into recycled resources is an important mission demanded of construction companies. At Shimizu, the entire company pursues 4R activities (Refuse, Reduce, Reuse, and Recycle) and we are working to comply strictly with laws and regulations and achieve even greater control over construction by-product generation and recycling resources to provide faithful craftsmanship of value to society.

Total Emissions Volume, Final Disposal Rate, and Total By-products Generated Per Square Meter

The New Kantas construction by-product data management system is used to aggregate annual performance in terms of construction by-products generated from job sites.
We have also set KPI for reducing the final disposal rate and reducing the total volume of construction by-products per base unit and are managing these goals.
The volume generated increased from last fiscal year due to large dismantling projects. While we achieved our goal in terms of the final disposal rate, the total volume of by-products per base unit increased compared to the goal due to the increase in by-products generated at large production facilities.

Total volume generated:2.29million tons (+17% YoY)
Volume generated (excluding sludge):1.55million tons (+21% YoY)
Final disposal rate:3.0
[Target: 3.9% or less]
Total by-products generated per square meter:16.3kg/m2
[Target: 15.7kg/m2or less]
Total By-product per Base Unit
Total Volume Generated (Excluding Sludge) and Final Disposal Rate
Total Volume Generated (Excluding Sludge) and Final Disposal Rate
Total Construction By-products Generated
Total Construction By-products Generated

Initiatives in Resource Conservation and Improvement of Resource Efficiency at Job Sites (4R Activities)

We plan and pursue 4R activities and are working to use fewer resources, reduce the volume of by-products, and recycle resources. We also employ a system for predicting the volume of construction by-products that will be generated, and formulating and implementing a plan for effective reduction.
Shimizu also provides e-learning on proper processing of construction by-products, education in environmental risk management for the general managers and foremen of construction sites, and works to comply with laws and regulations at job sites, control the volume of by-products generated, and recycle resources.

Refuse
Going package-less, precutting at the factory, and unitization
Reduce
Using alternate formwork and industrialization at job sites to reduce use
Reuse
Reusing repetitive formwork (eco formwork) and improved soil
Recycle
Bringing materials to a recycling center so they can be reused, recycling by manufacturers (regional authorization, etc.)
Factory pre-cut
Factory pre-cut
Package-less
Package-less

Pursuing Proper Waste Processing and Electronic Manifests

At job sites, the waste generated during construction is listed item-by-item in a manifest. We verify that these items are delivered to processors via collection and transporters, and processed properly.
Shimizu has been pursuing the use of electronic manifests to ensure thorough processing of waste generated and in accordance with the national policy on moving to electronic documentation. We have managed nearly all construction via electronic manifests from fiscal 2017 onward, with the exception of special circumstances.

Trend in Use of Electronic and Paper Manifests for All Construction Work (in Japan)
Trend in Use of Electronic and Paper Manifests for All Construction Work (in Japan)

Encouraging Manufacturer Recycling Using a Region-wide Certification System

The Region-wide Certification System is a certification system where manufacturers that make exceptional achievements in managing the waste generated by their products such as through recycling are recognized. The manufacturer of a product obtains certification from the Minister of the Environment showing that they have cleared the strict standards of the Ministry of the Environment. This enables the public to know for certain that the discarded product will be processed properly and results in a higher rate of product recycling.
We carefully sort the drywall, urethane materials, and other by-products generated from construction at each construction project job site and are working to promoting product recycling by manufacturers through the Region-wide Certification System.

Conceptual flow diagram of the zero emission region-wide certification for drywall (photo)

Conceptual flow diagram of the zero emission region-wide certification for drywall (photo)

Description of Initiatives in Resource Conservation

Easily Removable Exhibition Hall for 100% Recycling
Construction of a Temporary Exhibition Hall on the East Side of Tokyo Big Sight (Tokyo Branch)

Shimizu diligently implemented 4R activities from the design and construction stage by preemptively considering the dismantling and removing of the building. In the construction stage, we applied various methods such as the steel pipe pile rotation and press fit method or our patented pile head ring socket construction method. We used precast concrete for the framework and unitized equipment during the construction stage, simplified packaging, and sorted waste, thereby substantially reducing generation of by-products. We also used recyclable materials for the exterior components and materials. We planned and implemented a 4D process using BIM, and employed environmentally friendly methods in the dismantling stage as well. Shimizu received a contributor's award from the Prime Minister for practicing the 3Rs (reduce, reuse, and recycle) in fiscal 2017 in this project.

Pollution Prevention

Shimizu endeavors to properly manage and prevent environmental pollution as an important component of management.

Asbestos

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.

In fiscal 2019, 2,358 tons of asbestos dust was generated from dismantling and renovation projects.

Shimizu has developed various kinds of proprietary technologies such as a real-time measuring device (FS-1), volume reduction equipment (Shico), an agent to prevent asbestos from becoming airborne (Astector). Furthermore, Shimizu encourages its employees to build capacity regarding asbestos management, such as by providing special asbestos training to employees and providing certification support for managers involved in the use of asbestos and employees involved in investigation of construction materials containing asbestos.

The Building Center of Japan accreditation certificate (Shimizu is the only major general contractor with this accreditation)
The Building Center of Japan accreditation certificate
(Shimizu is the only major general contractor with this accreditation)
Real-time measuring device (FS-1)
Real-time measuring device (FS-1)
Volume reduction equipment (Shico)
Volume reduction equipment (Shico)
Special asbestos training (head office)
Special asbestos training (head office)

Dioxins, PCBs, CFCs, Halons, Noise and Vibration

Shimizu has developed and uses the S-DA method of remediation for dioxin contamination.
We store PCB waste properly at our company, and completed the detoxification processing for capacitors in 2019.

The PCB waste currently in our possession as of March 2020 is shown below, with some additional findings. We are meeting with each contract processor and plan to complete the detoxification processing.

Stabilizer Other
3 pieces Drum can 11 cans

We conducted inspections and surveys on the fluorocarbons of the equipment we manage in accordance with the revised fluorocarbon law, and confirmed proper management. Furthermore, through our internal environmental audits as constructors, we verify that our management of waste CFC emissions from special equipment used during building demolition is being managed properly.

Shimizu has also developed and uses the Cool Cut method to control the generation of noise, vibration, and dust during the demolition process.

Soil Remediation

We prevent problems related to the soil environment and make efficient and effective efforts with many countermeasure technologies for purifying contaminated soil.

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