- BUSINESS: What We Do
Renovation Business
Contributing to Society through Proprietary Technologies for Major Infrastructure Renovation
Elevated bridges and bridges built for highways and the like during the rapid economic growth period (1955-1973) in Japan are entering a period of major renovation. Compared to new construction works, these renewal works for such structures as expressways are often carried out while it is in use. Therefore, it requires more construction expertise and techniques.
We at TECHNOS possess many proprietary technologies for this renewal work and have been contributing to society by providing seismic reinforcement works as well as repair and maintenance works for structures like bridges and tunnels.
Seismic Reinforcement Works for Elevated Highway Bridges
Many elevated bridges such as highways have been constructed more than 50 years ago and require seismic reinforcement and measures to prevent concrete pieces from peeling off.
We undertake seismic reinforcement works, concrete peeling prevention measures, and repair works as a prime contractor, and sometimes as a subcontractor.
- Seismic Reinforcement Work
- Concrete Peeling Prevention Measures
- Repair Work
Renovation Works for Power Facilities
Many power facilities have been in use for a long time since constructed and require tunnel repairs, channel repairs, etc.
We undertake tunnel reinforcement, waterway repair, and dam apron repair works as a prime contractor, and sometimes as a subcontractor.
- Tunnel Repair Work
- Waterway Repair Work
- Dam Apron Scouring and Repair Work
Civil Engineering Renovation Works
We carry out various civil engineering renovation works such as renovations of athletic fields and streets for local governments.
We undertake renovation works as a prime contractor, and also we can carry out other public works as a subcontractor.
TECHNOS’ Technologies
KIRIKATA JOHZU (Bridge floor slab cutting method aims to shorten road closure periods)
“KIRIKATA JOHZU” is a floor slab cutting method which all cutting equipment are placed on the underside of the floor slab. Compared to the conventional method, this method reduces the floor slab replacement time by 50% and contributes to shorter road closure period during construction. It efficiently separates the floor slab from the main girder of the bridge by using a dry high-precision wire saw.
In the conventional method, a large tensile force is applied to the main girder during stripping, and has a risk of being severely deformed. With KIRIKATA JOHZU method, however, there is no such concern or risk of damage to the existing structure.
*This method is jointly developed by Seiwa Dia Corporation and TECHNOS CO., LTD.
Joint-Johzu Method (Spalling prevention method for brick tunnels)
This joint filling method can be efficiently applied using a new material developed for filling deteriorated mortar joints in brick and block tunnels.
The material has plasticity, underwater anti-washout ability, and ultra-fast hardening, enabling efficient construction even under conditions where construction time is limited such as railroad tunnels in service.
A dedicated electric injection gun discharges the material so that it does not scatter, and enables easy and quick installation.
Seismic Wrap Method
This is an earthquake-resistant reinforcement method. Steel plates cut into corrugations are piled up around existing concrete columns, and the gaps between the concrete columns and the corrugated plates are filled with mortar to prevent shear failure and improve the toughness of the columns.
Polymer Cement Mortar (PCM) Spraying Method
This PCM spraying method improves seismic performance by spraying polymer cement mortar to integrate it with the existing structure, such as concrete, steel, etc.
The construction period can be shortened because a wide area can be constructed at once.
Water Jet Method
This method utilizes a mechanism that destroys an object by the collision pressure of a high-speed water jet sprayed from a nozzle. Unlike breakers, rock drills, and other types of mechanisms that can damage the object, this method does not damage the surrounding concrete or rebars.
