Oriental Shiraishi Corporation

What Oriental Shiraishi Corporation does

Oriental Shiraishi Corporation is manufacture, sells, and constructs prestressed concrete products and structures, builds pneumatic caissons, repairs, retrofits, and reinforces infrastructure, designs, and constructs earthquake-resistant buildings, and sells construction materials and devices.

Name

Oriental Shiraishi Corporation

Legal name

Oriental Shiraishi Corporation Ltd

Website

http://www.orsc.co.jp

Company type

Public

Founded year

1952

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Oriental Shiraishi Corporation is a construction company that builds monorails, bridges, and other similar structures.

Ownership category

akta.pro rank

Product category

Specialty Civil Engineering Construction

NAICS

Commercial and Institutional Building Construction (236220), Utility System Construction (2371), Structural Steel and Precast Concrete Contractors (238120), Architectural, Engineering, and Related Services (5413)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Heavy Construction Other Than Bldg Const - Contractors (1600), Concrete Products, Except Block & Brick (3272)

akta.pro primary industry

Office & Corporate Building Construction (IMAFACAA)

akta.pro secondary industry

Civil & Structural Engineering Consulting (BPAHAIAA)

Keywords

• Pneumatic caisson construction
• Prestressed concrete engineering
• Bridge seismic reinforcement
• Precast concrete products
• Civil engineering construction

Headquarters

HQ city

Koto

HQ country

Japan

HQ region

Asia

Offices36 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales, Others

Revenue model

1. Construction Services (Civil Engineering and Building): Project-based revenue from civil engineering and building construction services. Major project categories include pneumatic caisson foundation construction, prestressed concrete bridge construction and repair, seismic reinforcement, and infrastructure maintenance. Revenue is generated through public works contracts with government agencies and government-affiliated bodies. The company operates on a project-by-project basis with revenue recognition tied to project completion milestones.
2. Precast PC Product Manufacturing and Sales: Manufacturing and sale of precast prestressed concrete products including bridge girders, slab elements, tunnel segments, tanks, and specialty PC components. Products are manufactured at company-owned factories (Kanto, Shiga, Fukuoka) and sold to construction contractors and project clients. ISO 9001 certified manufacturing with standardized quality management.
3. Construction Materials and Specialty Products: Sale of proprietary construction materials and products including NAPP (prestressing hardware), curing agents (Cure Keeper, Cure Brit), concrete admixtures (Chupole LS-B), corrosion reporting systems (EcorrLIGHT), hybrid slim guard temporary barriers, and concrete-related chemical products. Distributed through the company's own sales network and via co-development/manufacturing partners.
4. Solar Power Generation: Solar power generation business commenced in April 2015. The company generates and sells electricity from company-owned solar installations, contributing to revenue diversification.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels5 records

Core offering

Oriental Shiraishi Corporation is a specialty Japanese construction contractor that provides civil engineering and building construction services grounded in three proprietary technology pillars: pneumatic caisson foundation construction (Japan's pioneer since 1933), prestressed concrete (PC) construction (pioneer since 1952), and repair/reinforcement methods for bridges, buildings, and infrastructure. The company sells project-based construction services primarily to government and public-sector clients (ministries, NEXCO, JR, local governments), and also manufactures and sells precast PC products (tanks, piers, pontoons, walls, pavements) and specialty construction materials (NAPP anchors, curing agents, chemical admixtures).

Product overview

Oriental Shiraishi Corporation operates as a specialized construction technology company offering a comprehensive portfolio of products and services centered on three core technologies: Prestressed Concrete (PC) construction, Pneumatic Caisson methods, and Repair/Reinforcement technologies. The company provides both construction services and manufactured products, including PC buildings, bridges, tanks, and infrastructure components, supported by proprietary construction methods and concrete additives.

Differentiator

Problem solved

Functional benefit

Products and services

• Pneumatic Caisson Construction Services Construction service for building underground structures by sinking concrete caissons with compressed air to prevent water ingress. Used for bridge foundations, sewage pump stations, underground retention basins, tunnel launch/receiving shafts, railway and road tunnels, and building underground facilities. Includes the SI-Neuma automated design system enabling unmanned and remote-controlled excavation.
• Bridge Construction Services (Superstructure and Substructure) Complete bridge construction including PC composite truss bridges, PC truss bridges, roaring-method (concrete arch) bridges, and bi-prestressing methods. Covers both superstructure and substructure work for highway, expressway, railway, and monorail bridges.
• PC Building Construction Services Building construction services using prestressed concrete techniques including cast-in-place PC, precast PC, ORS outer frame, and PCa brace methods. Targeted at public facilities, educational institutions, commercial buildings, and sports arenas requiring large column-free spaces and seismic resilience.
• Bridge Repair and Seismic Reinforcement Services Specialized repair and seismic reinforcement services for bridge substructures, foundations, piers, slabs, and waterway tunnels. Includes proprietary methods such as Kui Taishin-SSP, PC Well-Reflo, Pier-Reflo, SLJ Slab, Cotter Slab, PC-Rev, SP Clamp, NAV-G, ONR, TC Unit, and STEP. Targets NEXCO bridge repair (top-class market share) and bridge life extension.
• PC Tank (Circular) Prestressed concrete circular tanks for water storage, sewage, petroleum, LNG, cement, grain silos with high water tightness and seismic resistance. Manufactured and sold as a precast concrete product.
• Precast PC Square Tank Factory-produced precast PC square tanks for water storage with quick assembly capabilities for tight construction sites. Sold as a precast concrete product.
• PC Pavement Prestressed concrete pavement for roads and airports using pre-stress to enable thinner slabs with superior durability. Sold as a precast concrete product.
• PC Pier Prestressed concrete piers using precast PC beams for port construction with excellent durability in marine environments. Sold as a precast concrete product.
• PC Pontoon Prestressed concrete floating piers with high durability in marine environments, available in light concrete variants. Sold as a precast concrete product.
• PC Wall Hollow precast PC panels installed by push-in method for earth retention structures including retaining walls and underground detention ponds. Sold as a precast concrete product.
• PCR Method (PC Roof Method) Non-cut-and-cover method pushing precast PC beams under railways and highways to construct underpass structures while maintaining operations. Sold as a precast concrete construction service/product.
• CFRP Slab (Carbon Fiber Reinforced Plastic Slab) Corrosion-free precast PC deck using CFRP cables for severe salt damage environments in port structures. Sold as a precast concrete product.
• Port Pier SLJ Deck Precast deck with end-band joints specifically designed for two-direction joints in port pier applications. Sold as a precast concrete product.
• NAPP (Prestressed Anchor Unit) Hollow PC steel rod and holder assembly for introducing prestress into concrete, developed jointly with Kochi Heat Treatment. Sold as a specialty construction material/product.
• Hi Jechter (Premix-AD) Ultra-low viscosity premix PC grout for filling tight spaces in PC steel tendon sheaths. Sold as a specialty construction material.
• Hyper Afterbond Cement-based ultra-delayed grout material with factory-prefilled PE-sheathed PC steel for corrosion resistance. Sold as a specialty construction material.
• Cure Keeper Finishing aid and curing agent improving workability and moisture retention to prevent plastic shrinkage cracking in concrete. Sold as a specialty construction chemical.
• Cure Brit Hybrid durability enhancement curing agent suppressing moisture loss and blocking chloride and carbon dioxide ingress into concrete. Sold as a specialty construction chemical.
• Chupole LS-B (Chub Pole LS-B) Shrinkage-reducing AE water reducer combining water reduction with crack reduction for improved concrete durability. Sold as a specialty concrete admixture.
• EcorrLIGHT (Corrosion Detection System) LED-based visual corrosion monitoring system for concrete reinforcement using solar battery for remote inspection. Sold as a specialty construction equipment/product.
• IH-Type RPR Coating Removal System Induction heating coating removal system for steel surfaces without dust, noise, or chemical use. Sold as a specialty construction equipment/product.
• Lightweight Insulating Eco Sheet Double Lightweight insulating concrete curing sheet reducing weight by 30% while maintaining thermal performance. Sold as a specialty construction material.
• Wall Parapet Curing Sheet Sealed curing sheet for bridge wall parapets with thermal insulation for winter concrete curing. Sold as a specialty construction material.
• Hybrid Slim Guard (Temporary Safety Barrier) Composite concrete and cast iron temporary safety barrier developed with NEXCO West and Keikon, 350mm wide for limited space applications. Patent No. 6804681. Sold as a specialty construction equipment/product.
• F-Cure Concrete (Non-steam precast concrete method) Non-steam precast concrete method achieving production efficiency and carbon reduction by eliminating steam curing. Sold as a proprietary concrete technology/product.
• Solar Power Generation Business Electricity generation and sales from company-owned solar installations, contributing to revenue diversification and sustainability initiatives.

Quantifiable outcome

• World's largest pneumatic caisson structure (4,838 m² floor area — 1.5x larger than Rainbow Bridge anchor block)
• +6 more outcomes

Named customers13 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature10 records

Partnerships

One partnership is on record.

• Akari Inc. (Akari株式会社)coreStrategic or Co-development Partner · 23 July 2026Akari Inc., an AI startup originating from the University of Tokyo, partnered with Oriental Shiraishi Corporation to co-develop software that automates equipment planning for the pneumatic caisson construction method. The AI system can instantly generate multiple optimal layout proposals by processing site drawing data, replacing a process that previously required skilled technicians several days to complete. Both companies aim to apply this technology to actual construction projects while addressing Japan's construction industry challenges of workforce shortages and knowledge transfer from retiring technicians.

Scale indicators11 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• PS Mitsubishi Corporation: Japanese specialty contractor focused on prestressed concrete (PC) bridges, piers, and PC building construction. Closest direct competitor to Oriental Shiraishi's PC construction and bridge engineering business, serving similar government and infrastructure clients with comparable methods and customer profiles.
• Sumitomo Mitsui Construction Co., Ltd. Operates a major bridge and PC construction division alongside general building and civil engineering. Directly competes with Oriental Shiraishi in PC bridge superstructure/substructure and seismic reinforcement work for government and railway clients.
• Tekken Corporation: Specialized Japanese contractor in railway civil engineering, tunneling, and foundation work including caisson methods. Comparable in technical specialization and customer mix (JR and government infrastructure), competing for similar heavy-civil tenders.
• Tokyu Construction Co., Ltd. Civil engineering and building contractor with established bridge and infrastructure construction capabilities. Competes with Oriental Shiraishi on bridge, expressway, and public infrastructure projects across Japan.
• Penta-Ocean Construction Co., Ltd. Major Japanese contractor specializing in marine, port, and coastal infrastructure including large-scale foundation work. Overlaps with Oriental Shiraishi on port and harbor pneumatic caisson projects (e.g., Osaka Shinya Adjusting Pond) and seismic reinforcement of marine structures.

Broad incumbents

• Shimizu Corporation: One of Japan's largest general contractors (super-zene) with extensive civil engineering and PC bridge capabilities. While much broader and larger than Oriental Shiraishi, it competes on large public-works tenders and PC bridge projects as part of a diversified portfolio.
• Obayashi Corporation: Major Japanese super-zene contractor with deep civil engineering and bridge construction capabilities. Competes in the same public-works procurement space as Oriental Shiraishi, though as part of a much broader portfolio spanning buildings, infrastructure, and overseas work.
• Kajima Corporation: Largest Japanese construction super-zene with significant civil engineering and infrastructure operations. Engages on large bridge, tunnel, and foundation projects alongside Oriental Shiraishi in government tenders, but as one of many business lines.
• Taisei Corporation: Major Japanese general contractor (super-zene) with active civil engineering division that competes on expressway, railway, and bridge tenders alongside Oriental Shiraishi. Substantially broader and larger than the specialty-caisson/PC niche.
• Toda Corporation: Established Japanese general contractor with civil engineering and infrastructure operations competing for government and private infrastructure tenders. Operates at scale across building and civil works, overlapping with Oriental Shiraishi on PC bridge and seismic reinforcement projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/orishira_recruit

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Oriental Shiraishi Corporation