ジャスト List of Products and Services

The "Durability Survey" is a service that supports the longevity of buildings. Reducing the maintenance costs of aging buildings has become a significant social issue, and to lower the life cycle costs of buildings, more effective and efficient longevity measures are necessary. Even when discussing the longevity of a building, without knowing its remaining lifespan, it is impossible to implement specific and effective longevity measures. This survey first assesses the current condition of the building and then predicts its remaining lifespan. Furthermore, we provide necessary decision-making materials for planning and examining the future of the building, such as proposals for extending the building's lifespan (longevity), prioritizing renovations when there are multiple buildings, determining whether renovations are worthwhile, or whether it would be better to demolish the building. Please feel free to consult us when you need our services. *For more details, please refer to the PDF materials or feel free to contact us.

• Other construction services
• Facility Design

We would like to introduce a case study of a durability survey conducted during the seismic retrofitting work of a government building. While seismic isolation is low-cost, there were concerns about the durability of the structure, leading to consideration of new construction. It was estimated that even with large-scale repairs repeated over 50 years, the total repair costs would be around several hundred million yen, and thus the decision was made to proceed with seismic isolation rather than new construction. In addition to this, we also present examples of renewal work, long-term use of existing facilities, and assessments of facilities that are 80 years old. 【Case Overview】 ■ Concerns - If the remaining useful life is about 10 years, is the cost-effectiveness justifiable? Should new construction be considered? - New construction costs over 10 billion yen / seismic retrofitting costs 2.3 billion yen ■ Results - Confirmed that there is a useful life of 50 years ahead - Estimated total repair costs over 50 years to be around several hundred million yen *For more details, please refer to the related links or feel free to contact us.

• Structural Survey

We would like to introduce our service "Seismic Survey" for existing structures. The survey for seismic diagnosis of existing RC (Reinforced Concrete) and SRC (Steel Reinforced Concrete) buildings is conducted in accordance with the "Standards and Explanations for Seismic Diagnosis of Existing Reinforced Concrete Buildings." Starting with a preliminary survey to determine the applicability of the diagnostic standards and set the diagnostic level, we conduct primary surveys, detailed surveys, and more. The investigation of components, seismic walls, and the position and dimensions of openings is carried out meticulously, as these factors significantly impact the diagnostic results. In addition, we also conduct surveys for seismic diagnosis of steel structures and wooden houses. Please contact us if you require our services. 【Overview of Seismic Survey】 ■ Survey for seismic diagnosis of existing RC and SRC buildings ■ Survey for seismic diagnosis of steel structures ■ Wooden house diagnosis *For more details, please refer to the related link page or feel free to contact us.

• Structural Survey
• Other services and technologies

The lifespan of piping systems varies depending on their application and type, but deterioration of pipes, such as water leakage incidents, is a very serious issue for buildings. Our company estimates the remaining lifespan of various piping systems by combining non-destructive testing methods such as X-rays, endoscopy, and ultrasonic thickness measurement with sampling investigations through pipe removal. In crack investigations, we estimate the causes of concrete cracking and propose improvement methods. Additionally, we investigate decayed wood caused by termite damage or rainwater intrusion inside walls using X-rays and other inspection equipment. Please contact us if you require our services. [Survey Overview] ■ Crack Investigation ■ Wood Aging Investigation ■ Waterproofing Investigation ■ Equipment Deterioration Investigation ■ Piping Deterioration Investigation *For more details, please refer to the related link page or feel free to contact us.

• Structural Survey
• Other services and technologies

Our "Durability Survey" statistically calculates the probability of rebar corrosion from the depth of carbonation and the cover thickness of reinforced concrete structures, even from a small sample, and evaluates it based on reliability design. We predict the current and future health status of structures and propose optimal timing and frequency for renovations to ensure that the structures remain safe and in good condition over the long term. Based on statistical reliability design methods, we evaluate the durability of reinforced concrete structures, estimate the duration until limit states, and assist comprehensively with renovation frequency and methods. [Survey Items] ■ Drawing Survey ■ Appearance Deterioration Survey ■ Cover Thickness Survey ■ Rebar Corrosion Survey ■ Carbonation Depth Survey ■ Concrete Compressive Strength Test ■ Concrete Moisture Content Measurement *For more details, please refer to the related link page or feel free to contact us.

• Structural Survey
• Other services and technologies

In the case of fire-resistant structures such as reinforced concrete and steel structures, most instances do not develop into large-scale fires even if a fire occurs, thus avoiding destruction. Therefore, it is necessary to accurately assess the structural safety and durability of the remaining structures for safe reuse after a fire. As guidelines for such post-fire investigations, the Architectural Institute of Japan has published "Guidelines for Fire Damage Diagnosis and Repair/Strengthening Methods, and Commentary," and the Japan Society of Civil Engineers has published "Guidelines for Diagnosis and Repair of Steel Bridges Affected by Fire." At Just, we conduct more precise investigations by incorporating our own non-destructive testing methods in accordance with these guidelines. Additionally, by applying non-destructive testing technology, it is also possible to estimate the tensile strength of steel materials and measure bolt axial forces on-site without damaging the components. Please feel free to contact us if you require our services. *For more details, please refer to the related links page or feel free to reach out to us.

• Structural Survey
• Other services and technologies

Even in durable reinforced concrete buildings, natural environmental factors such as daily wind, rain, light, and heat, as well as human usage conditions, can lead to aging and deterioration of the material's strength and performance over time. Therefore, our company conducts exterior wall surveys to gather basic data for repair work and to understand the current condition of the exterior walls. Using a tapping hammer, we tap the wall surface to check for any detachment based on the sound produced. In crack surveys, we measure the width and length of cracks using a crack scale. Additionally, we can investigate wall detachment using infrared thermography, which can be used in conjunction with tapping surveys. [Survey Items] - Detachment, bulging, and cracking of tiles and mortar - Deterioration of sealing and finishing materials *For more details, please refer to the related link page or feel free to contact us.

• Structural Survey
• Other services and technologies

"J-Scan 3D+" is a service that uses a 3D laser scanner. Currently, the digitization and dataization of existing structures, including BIM for architecture and CIM design for civil engineering, is accelerating. In the digitalization of complex existing structures, point cloud data obtained through 3D scanning is widely utilized as fundamental data. By combining scanning technology with the expertise we have cultivated over half a century in the inspection and investigation of structures, we aim to meet our customers' demands with the added value of scanning that goes beyond mere 3D measurement, offering "plus alpha." 【Features】 ■ Approximately 10 minutes per measurement ■ Significant time savings compared to manual measurement ■ Possibility of secondary use such as drawing restoration and 3D modeling ■ Scanning of high places and complex structures as they are *For more details, please refer to the PDF document or feel free to contact us.

• Other construction services
• Structural Survey
• Measurement and analysis equipment leasing and rental

"J-SHOT" is an inspection and survey service that utilizes cutting-edge imaging technology, including ultra-high-resolution digital camera systems and super-telephoto camera systems. The pixel count of the ultra-high-resolution digital camera is 100 million pixels, and the telephoto performance of the super-telephoto camera is equivalent to 2,000mm in 35mm format. When combined with digital zoom, it reaches 4,000mm. By integrating these camera systems, it has become possible to conduct inspections and surveys that surpass traditional visual inspections in a short amount of time. Traditional high-altitude visual inspections required scaffolding or gondolas, but with this product, these temporary costs can be reduced, allowing for detailed information to be obtained safely from a distance. Additionally, it can be used not only for inspecting structures and signs but also as an alternative to drones. [Features] ■ Overwhelming 12K resolution with dynamic and rich color representation ■ Extensive and detailed information ■ Capability to shoot in low-light conditions ■ Range of adjustments for brightness and shadows ■ Effective in various locations *For more details, please refer to the PDF document or feel free to contact us.

• Other construction services
• Structural Survey
• Facility Management System

"J-PANO" is a service that captures various situations inside and outside buildings in 360° panoramic photos and connects those images to create a street view. It allows for the addition, management, and sharing of various information related to buildings and other structures within the panoramic photos, making it highly suitable for facility maintenance and management. Visualization is possible anywhere, from narrow spaces within ceilings to large facilities like factories! Information can be shared on a PC without having to visit the site. 【Features】 ■ Visualization of all areas of a building with 360° panoramic images ■ Compatible with smartphones, tablets, and VR goggles ■ Quick turnaround from shooting to delivery ■ Comprehensive security measures ■ Usable in various business scenarios *For more details, please refer to the PDF document or feel free to contact us.

• Other construction services
• Structural Survey
• Facility Management System

At Just Co., Ltd., we offer a service called 'J-SKY' that conducts inspections of non-structural components such as building exteriors and signs using drones. We select the optimal drone and camera based on the customer's objectives and environment, capturing images to analyze deterioration conditions such as cracks from high-quality overall images, and create crack diagrams. Furthermore, based on the captured images and analysis results, building inspection professionals will analyze and provide support for the investigation. 【Features】 ■ Short preparation and cleanup time (about 10 minutes) ■ Reduced on-site inspection time compared to visual inspections ■ Cost savings on temporary scaffolding and aerial work platforms ■ No materials required ■ Reduction in labor costs due to shortened work time *For more details, please refer to the catalog or feel free to contact us.

• Other construction services
• Structural Survey