Field survey

The shape of the bridge and site conditions vary.We make a plan after carefully investigating the delivery route to the site, where equipment is installed, and the state of the existing coating film in advance.
In the case of repainting, in order to grasp the presence or absence of harmful substances in the existing coating film, if there is no coating film survey result, we also conduct a coating film survey.

Design integration

We will reflect the results of the field survey and make the best design for the site.
At the same time, safety measures based on laws and regulations will be incorporated for each type of work.
We also carry out accumulation according to the design content.

Construction planning

To meet the requirements of the orderer and to make the construction safer, better, cheaper, faster and less environmental impact.Determine the method and procedure for construction.
For this reason, we conduct on・site inspections to understand the surrounding environment, contract conditions with the ordering party, consultation and coordination with the local community, and other conditions at the site.We will conduct a design review and discuss with the ordering party if there is any shortage, etc.
After technical examination of the construction method, the construction order, and the machine used, the construction plan is drawn up.

Construction management

We provide high-level construction management that matches the contents described in the construction plan and on-site construction, and can confirm the contents by utilizing the track record and experience cultivated in many original construction works.We will do it.

Safety management

As a whole, we will thoroughly implement "safety first" and carry out safety management.
We conduct regular in・house patrols (on-site and in writing) led by the Quality, Environment, Safety and Health Office, and immediately correct defects and eliminate dangerous elements.
In the case of repainting, since harmful substances are handled, management and safety measures based on laws and regulations are also essential.

Reducing the impact of construction

We will carefully grasp the situation around the construction site and actively consider minimizing the impact of construction, such as reducing congestion and noise.
(In the steel bridge reinforcement work, we have a track record of using the TRS method to perform repair of steel floor slab with main line regulation from within the girder without main line regulation.)）

Cost reduction because it is a one-stop service

In steel bridge repair work, we can take on the series of processes from planning, design and estimation to construction planning, construction work (floor slab repair, telescopic contact repair and replacement, support repair and replacement, installation of falling bridge prevention devices, crack repair and preventive maintenance, base adjustment, painting, etc.), construction management, and completion, which reduces total costs.

Quick response because it is a one-stop

Since all decision・making and communication in each process can be completed by one company, time loss in confirmation and judgment can be reduced as much as possible.

Quik Deck

Our company owns the "Quik Deck (NETIS TH-150007-VE Semi-recommended technology)", a pre-floor construction system suspended scaffolding, more than 1 million square meters in-house.
The horizontal swivel assembly method improves safety in aerial work.
The wide chain pitch of 2.5m makes it easy to handle large materials such as reinforcement members within the scaffold.
Due to its high strength (maximum load 350kg/㎡), frame scaffolding can be installed on the scaffolding, and it is effective on truss bridges with high girder height.
We offer advanced long-life technology with high-strength scaffolds that are safe and efficient.

Support for bridges of various shapes

In addition to the plate girder bridge and box girder bridge, we also deal with bridges of various shapes such as lower arch bridge and pedestrian bridge, and we carry out construction while securing traffic as much as possible.It's a good idea.

Measures for the surrounding environment

A safety net is put up before scaffolding installation to prevent secondary accidents caused by falling workers and falling materials and equipment during work.This net is also used for the same purpose when removing scaffolding.
In the case of blasting, the work area is covered around the scaffold with planking protection equipment, etc., so that dust such as grinding material and coating film debris do not scatter around the surrounding area.The rear must be sealed.In addition, the inside is cured reliably by the "Eco Clean Blast sheet" for blasting.In addition, it is necessary to keep the working area at negative pressure by negative pressure dust collector.None of these is a perfect measure.

TRS construction method

As a repair method for fatigue cracks in steel bridges, plate repair has been adopted as an effective means.The reinforcement plate is attached with high strength bolts, but depending on the repair point, the road surface is restricted by traffic, asphalt and concrete are chipped, and the bolt is fixed.It was necessary to recover after tightening the bolt.
TRS (Slot rolling screw) is a high-strength bolt that makes an anchor (bolt head) on the back and stops it, but it does not make an anchor and does not make an anchor from one side.It is an epoch-making bolt that can be fixed with only one bolt.
By adopting this method, traffic regulation of the road surface and restoration of the chipping of the pavement surface are unnecessary, and construction costs and social losses due to traffic regulation can be suppressed.You can also use the following methods:(Our company has a track record of being employed in the repair work of the Meiko Nishi-ohashi Bridge.)）

Eco Clean Crack Buster

It is a technology that closes the micro-cracks discovered during bridge inspection by repeated blows with a needle, and delays or stops the progress of the cracks.
Since compressive residual stress can be applied, preventive maintenance of cracks is also possible by improving the fatigue strength of non-crack areas.

Replacement of accounts

The bearing is an important member located at the contact point of the upper and lower structures of the bridge.The purpose of the replacement is to restore the function of the existing support due to aging and to improve the seismic performance.In general, the girder is jack-up and replaced on the support, but the girder reinforcement of the jack-up part is necessary if necessary.
The optimal construction method is selected according to the conditions of the target bridge, such as the structure type of the bridge, the surrounding environment, and construction conditions.

Telescopic device

The telescopic device is installed at the end of the road surface of the bridge, and is used to absorb the expansion and contraction of the bridge due to changes in temperature, deformation of the bridge during an earthquake and with the passage of vehicles.It is intended to allow cars and people to pass without hindrance.
However, it may cause noise and vibration because the car is directly loaded.In addition, because deterioration or damage of the telescopic device can lead to serious accidents, it is necessary to consider the size of the bridge, the characteristics of passing vehicles, and consideration for surrounding residents.We will make the selection.

Shot peening

As a preventive maintenance technology for fatigue cracks, we have focused on "shot peening", which has been proven in the automotive and aircraft industries.
Shot peening is a process in which a large number of special steel balls (shots) for peening are struck on the steel surface at high speed, and plastic deformation is made only near the surface.By applying compressive residual stress to the surface layer, this technology improves resistance to fatigue cracks and stress corrosion cracking.
From automotive parts such as springs, gears, crankshafts, etc., to aircraft related parts such as jet engines, wings, landing gears, etc.It has been used to ensure safety.

Industry-academia Collaborative Research

We conducted a joint research with Gifu University to investigate the effectiveness of shot peening using the circular shot peening method (former name: Eco-clean hybrid method).The results of the research were scientifically proven and published.We will continue to conduct research that will lead to further development in the future.

Recirculating Shot Peening Method

In the repainting process, "Circulating blast method_®︎By replacing the metal・based grinding material for blasting with a shot, the system of "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot", "shot"It is also possible to reduce the amount of heat generated by the heating process.Only "Shot for circular shot peening to steel structure" specified in JIS G 0951 is used for the shot.
A hybrid method of blasting and shot peening in the repainting process.This is the circular shot peening method (former name: Eco-clean hybrid method).

Recirculating Blasting Method_®

The circulating blasting method _® is a blasting method that uses highly abrasion-resistant metal grinding materials, collects both the paint debris that has been peeled off by blast and the used grinding materials, selects them, and then recycles the grinding materials. By recycled and reusing grinding materials, it is possible to suppress the generation of industrial waste equivalent to that amount, and reduce the environmental impact. It also minimizes dust generated during blasting. Significant dust suppression will clear the field of vision of workers, leading to improved safety and work efficiency.
The effect of suppressing the generation of industrial waste using the Recirculating Blasting Method_® has been objectively confirmed by the Construction Technology Examination Certification, and has been registered with NETIS as a new technology, including various improvements.
The Japan Steel Structure Recirculation Blasting Technology Association was established with the aim of spreading this method, ensuring construction systems, and developing technical capabilities, and is working to develop activities nationwide.

Japan Steel Structure Circulation Blast Association【JSCB】

The Japan Steel Structure Circulation Blast Association (General Incorporated Association) was established with the objective of ensuring the nationwide adoption and establishment of a construction system for the Circulation Blast Method _® using metallic abrasives, particularly in heavy-duty anticorrosion measures for prolonging the lifespan of steel infrastructure.
As of July 2023, the association has 119 corporate members and 1 organizational member. The cumulative construction track record of the Circulation Blast Method_® by the association members stood at approximately 1.93 million ㎡ at the end of FY 2022.

Construction Technology Examination certificate

In the midst of similar construction methods, circulating blasting method_®︎In order to clarify the definition of industrial waste, we confirm the effect of suppressing the generation of industrial waste by the reduction rate of the grinding material used in the construction technology examination certificate.
We set the specifications and construction conditions of the equipment and grinding materials to be used, and after satisfying the prescribed construction quality and construction efficiency compared with the case where the grinding materials are not reused, we will perform the followingThe Review Committee, which consists of a third party, has confirmed the high rate of reduction in the number of employees.
- If the grinding material used is high carbon cast steel grit grade A: 99.89%
- If the grinding material used is SUS430 cut wire: 99.94%

Eco Clean Cool Suit

Blasting works are classified as "Specific dust work" according to the Dust failure Prevention Regulations.Therefore, equipment required by laws and regulations, such as air supply masks and chemical protective clothing, is essential.
The Eco Clean Cool Suit is an upper and lower separation type full body protective suit that combines the functions of an air supply mask (JIS T 8153) and a chemical protective suit (JIS T 8115).
When working in the summer, a cold air conversion device is installed to send cold air into the suit and protect the worker from heat stroke.

It has been selected as the recommended technology for the Reiwa 5 fiscal year by NETIS.(CB-190009-VE)

Eco Clean Blast Sheet

During the blasting operation, it is necessary to put a blast curing sheet in the sealed work area to shut out the abrasive material and harmful dust.You can also use the following methods:
Eco-Clean Blast Sheet is a brand with high durability that does not damage even if the impact caused by the scattering of grinding materials, and high flexibility to follow even complex shapes.It is a curing sheet for exclusive use of the test.
It also conforms to the flameproof brain prescribed by the Fire Fighting Law.

Circulation wall surface blast robot

We have developed a "circular wall blasting robot" that reliably removes fragile parts such as layance layers and weathered parts in concrete surface treatment.
Since it adsorbs to the concrete surface and performs surface treatment, it can be constructed without scattering of dust.We have succeeded in recycling the grinding material and making only concrete powder as industrial waste.

Eco Clean Shot

Eco Clean Shot is a polyhedron grinding material made of stainless steel with improved blast quality.By utilizing this technology, it is possible to improve the quality of the grinding material by eliminating the impingement of debris on the steel surface.

Recycling blasting method of twin nozzles

The twin-nozzle recycling blasting method is a direct suction type blasting method that uses eco-clean shot to improve grinding capacity and recycling rate.It is a construction method.Compared to conventional direct suction type blasting, grinding capacity and work efficiency are greatly improved, and coating film peeling and substrate adjustment can be performed efficiently at the same time.You can do it.

Consideration for noise

Recirculating Blasting Method_®︎The vacuum recovery device is the main source of noise for suction and recovery of heavy metal-based grinding materials.For this reason, the vacuum recovery device is equipped with a silencer, and the noise criterion value (105dB) of the low noise type construction machinery of the compressor, which is a knitting machine of the same method, is reduced.We are trying to reduce the noise so that it becomes the following.We measure noise at the acoustic power level measurement site of construction machinery located at the Construction Technology Research Institute of Japan Construction Machinery Construction Association, and hold a noise measurement certificate.It's a great place to start.
In addition, we have also developed an urban low noise unit, which enables blasting in urban areas, which has been considered difficult until now.

Cross section repair

Cross-section restorers are used to repair parts that are missing due to deterioration of concrete structures, and to repair parts that are not missing but contain degradation factors such as neutralization and chloride ions.It is a construction method for the purpose of cross-section restoration after removing the concrete.We select the best method according to site conditions and construction scale and perform cross-section repair.

Prevention of peeling

Peeling prevention is a preventive maintenance technology to prevent third-party disasters that occur when pieces of concrete fall off due to deformation of concrete structures.
Continuous fiber sheet, FRP grating net, epoxy resin, urethane resin, etc. are applied to the concrete surface to prevent peeling.We select the best construction method considering the site conditions.

Carbon fiber/Aramid fiber reinforcement

High-strength continuous fiber sheet (tow sheet) is a method for repairing and reinforcing concrete and steel structures that have deteriorated due to aging or damage.It is intended to improve the structural performance by sticking () to the surface of the object.

In this method, high-performance continuous fibers such as carbon fiber and aramid fibers are arranged in one direction, and a room temperature curing type such as epoxy resin is applied at the site.It is impregnated with glue and pasted on the surface of concrete or steel.When the resin is cured, the sheet is integrated with the structure, adding additional strength and rigidity.

Because the fiber sheet is lightweight and thin, the weight burden on the structure is small, and construction can be done by hand without using heavy machinery even in narrow places.In addition, it has excellent corrosion resistance and chemical resistance, and it is an effective repair method even under salt damage and corrosive environment.It is also possible to suppress the progress of corrosion and restore the function of steel components.

This method can be expected to suppress the progress of cracks and improve shear and bending strength, so it can be used for earthquake・resistant reinforcement and to respond to changes in the use environment.It is widely used in a variety of situations, such as in response to the needs of customers.

Crack injection

The purpose of crack repair is to restore waterproofness and durability.The injection method is one of the repair methods, and it is mainly a method for repairing cracks with a crack width of 0.2mm or less than 1.0mm.
In the actual repair work, it is necessary to check the cause and condition of the crack, the size of the crack width, the behavior of the crack, and the presence or absence of internal rebar corrosion.Then, we will select the appropriate construction method and materials to perform the construction.There are various factors that cause cracks, so it is important to identify those factors and remove them appropriately.

Establishment of a circular blasting Technician certification system

Through the Japan Steel Structure Recycling Blast Technology Association, we have established a recycling blast technician certification system, and have established a recycling blast technician certification system.We will strive to improve safety knowledge and safety awareness, such as measures against harmful substances such as lead poisoning, and safety equipment.

Vietnam Technical Training Center

Although the current Technical Intern Training System aims to contribute internationally through human resource development, there are also cases where it is used to secure labor.It has been pointed out that there is a discrepancy between the purpose of the system and the actual state of operation.For this reason, technical intern training, which was added to the purpose of "human resource development," has been abolished, and a new system has been proposed that was added to the purpose of "securing human resources."
However, there are concerns that if the purpose of securing human resources is added, it will be used only to secure the labor force even more.

Through the Japan Steel Structure Circular Blast Technology Association, our company aims to provide trainees with basic knowledge (technical capabilities) in advance before coming to Japan.In order to ensure efficient practical training after coming to Japan, as well as to raise the possibility of securing a place to play an active role in the home country after returning to Japan, and to establish a technical training center in Vietnam, we have established a technical training center in Vietnam.We have established a technical Training Center (Blast School) to secure highly skilled human resources.

Thorough safety management through the establishment of various guidelines

Through the Japan Steel Structure Recycling Blast Technology Association (JSTC), we have developed a system to prevent lead poisoning, fire, and benzyl alcohol in repainting work.We have created 3 types of guidelines for the eradication of "poisoning", etc., and we have made it known to our employees and association members about safety.
A checklist for each worker is also attached to improve the safety awareness of all workers.