Bridge Inspection

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Bridge Inspection, Survey, and Repair

Keystone Co., Ltd. is a professional in bridge inspection with extensive experience and achievements.
Qualified professionals, including Road Bridge Inspectors, perform close-up visual inspections using rope access techniques, with numerous successful projects involving special bridges such as long-span bridges and high-pier bridges.
Additionally, by not using work vehicles or large equipment, traffic restrictions are often unnecessary, greatly contributing to cost reduction and shortened construction periods. We can also handle sites with time constraints, such as railway overpasses.
Inspections using rope access are effective for cost reduction as they eliminate the need for scaffolding, shortening the construction period.

Situations Where Rope Access Is the Preferred Solution

• When steep gradients prevent the use of inspection vehicles
• For pedestrian bridges or bridges with vehicle weight restrictions
• On remote islands or other sites where vehicle access is difficult
• When the bridge width is too great for inspection vehicles to reach the center beneath the girders
• For main towers, cables, or arch components that are inaccessible by aerial work platforms

Inspections & Investigations

Regular Inspections

In accordance with legal standards, we perform visual and tactile inspections of bridge components such as the underside of girders, bearings, and mid-span sections. We accurately record deterioration or damage and propose appropriate countermeasures.

Detailed Inspections for Repair Design

We conduct in-depth assessments of damaged structural elements to gather data essential for repair planning. This includes crack width measurements and detailed investigations of bearing areas.

Magnetic Particle Testing (MT) & Carbonation Testing

We perform magnetic particle testing on steel structures and carbonation testing on concrete to identify internal damage and deterioration.

Sample Collection for Laboratory Testing

We collect various specimens—such as concrete cores, rebar, and chloride ion samples—for laboratory analysis.

Repair Work

Sectional Restoration & Crack Repair

We remove damaged areas and restore them using appropriate repair materials, including filling cracks and surface restoration.

Steel Bridge Repairs

Our services include component replacement, repainting, bolt re-tightening, and match-marking for proper alignment and structural integrity.

Data Organization, Analysis, and Report Preparation

Here is an example of our deliverables.

High-Quality
Reports Ready
for Direct Use

We take pride in delivering high-standard, professional documentation.

[Report Contents]
• Submission of inspection data (field notes and photographs)
• Creation of damage maps (CAD drawings)
• Preparation of technical records and reports

All inspections are conducted in accordance with the relevant guidelines.
We provide damage assessments and recommended response classifications based on each applicable standard.
Inspection results can be compiled and formatted flexibly to meet your specific requirements.

Technical Documents, Work Procedures, and Planning Reports

These documents provide detailed descriptions of our work procedures and technical standards.
Please download and review them for more information.

Handbook Vol.1

ダウンロード

Handbook Vol.2

Work Plan: Bridge Inspection

Safety Management Checklist

Rope Access Safety Management Guidelines

Bridge Inspection Illustration Guide

Sampling Procedure Manual

Inspection Procedures for Cable-Stayed Bridges

Public Relations & Direct Mail

On-Site Operations

Technical Documents

Frequently Asked Questions

Q. Is traffic control required?
A. It depends on the site conditions, but in principle, it is not required.

Q. How do you handle insurance and safety management?
A. We are fully covered by workers’ compensation insurance and have maintained a perfect safety record with zero accidents in our 33 years of operation.

Q. Can work be performed in rainy weather?
A. Yes. Since all work is secured by rope, operations can continue safely in light rain and wind.

Q. How long does it take to complete a project?
A. We are flexible and will adjust to meet your timeline requirements.

Our Promise to You

Cost-Efficient, High-Quality Solutions—Tailored to Your Budget

At our company, we deliver highly efficient bridge inspection services powered by skilled technicians and a passionate team.
We always prioritize your budget, finding the best possible solutions even under tight financial constraints.

We never turn down projects simply because of budget limitations. In fact, we see challenging conditions as opportunities to apply our ingenuity and technical expertise.

Please feel free to contact us for detailed cost estimates.
We also provide flexible formatting of inspection reports to meet your specific needs.

Bridge Inspection

Bridge Inspection, Survey, and Repair

Situations Where Rope Access Is the Preferred Solution