大和探査技術 List of Products and Services

Our company has developed an "Improved Elastic Wave Exploration" method to quantitatively and spatially evaluate the integrity (deformation level) of mass concrete in dams, which is being utilized in sand control dams nationwide. By setting up vibration points around the dam, we analyze the elastic waves that pass through the concrete in both vertical and horizontal directions, visualizing the elastic wave velocity distribution spatially and evaluating it quantitatively. The on-site work takes about 1 to 2 days, and the analysis results are organized visually in an easily understandable manner using contours and meshes. 【Awards and Achievements】 ■ Infrastructure Maintenance Award: Excellence Award (Received in 2021) ■ NETIS Registration Number: KT-190137-A (Registered in 2019) ■ Patent Registration Number: No. 6396074 (Registered in 2018) *For more details, please refer to the PDF materials or feel free to contact us.

• Erosion control works
• Geological Survey

Our company offers "microtremor array surveys" suitable for S-wave velocity structure investigations. We conduct analysis using the CCA method with points on the same circumference as a single array unit. Please feel free to contact us if you have any requests. 【Measurement Data】 ■Sampling interval: 2 milliseconds ■24 to 48 channels ■Continuous measurement for approximately 30 minutes per deployment *For more details, please download the PDF or contact us.

• Surveying

Our "Underground Structures, Foundation Piles, and Buried Metal Investigation (Vertical Magnetic Survey)" investigates the location and magnetic intensity of underground structures such as building and bridge foundations, foundation piles, and buried metals. It is possible to accurately investigate the position of objects containing metals underground, which are difficult to survey from the surface, using boreholes. 【Survey Targets】 ■ Underground foundations of buildings such as offices and structures like bridges ■ Concrete piles and steel pipe piles ■ Buried pipes and tunnels ■ Retaining wall sheet piles and concrete slabs ■ Unexploded ordnance ■ Other buried metals *For more details, please download the PDF or contact us.

• Other civil engineering services
• Geological Survey

Our "High-Density Elastic Wave Exploration (Shallow Ground Investigation Technology)" is a technique that visualizes the P-wave velocity structure (hardness/softness of the ground) in shallow underground layers by utilizing refracted waves generated at the surface. Please feel free to contact us if you have any inquiries. 【Measuring Equipment】 ■ Source: Hammer, etc. ■ Receiver: 28Hz Geophone ■ Explorer: GeoSEIS-48 *For more details, please download the PDF or contact us.

• Geological Survey
• Environmental Survey

Our "Shallow Reflection Seismic Exploration (Shallow Ground Investigation Technology)" utilizes reflected waves generated at the surface to visualize the geological structure and the boundaries between hard and soft ground in the shallow subsurface. Please feel free to contact us if you have any inquiries. 【Measurement Equipment】 ■ Source: Air Shot (in-house developed high-resolution source) ■ Receiver: 100Hz Geophone ■ Data Acquisition: DAQ Link 4 *For more details, please download the PDF or contact us.

• Geological Survey

Our company conducts health assessments of embankments using elastic wave tomography. We evaluate the overall health of the dam by combining the main investigation, which is elastic wave tomography, with supplementary investigations such as visual inspections, image enhancement technology, and thermographic surveys. Additionally, based on the results, we carry out detailed examinations such as sample collection to assess the health of the embankment, and we propose whether repairs are necessary, as well as the locations and methods for repairs based on the evaluation results. [Investigation Methods] ■ Overall Investigation: Elastic Wave Tomography ■ Detailed Investigation: Slice Tomography *For more details, please download the PDF or contact us.

• Other civil engineering services

Our company conducts marine surveys, including seabed surface surveys, fault surveys in marine areas, seabed foundation surveys, and seabed geological surveys. We also accommodate depth measurements. Please feel free to contact us if you have any requests. 【Survey Methods】 ■ Seabed Surface Survey: Side Scan Sonar ■ Fault Survey (Marine Area): Multi-Channel Acoustic Exploration ■ Seabed Foundation Survey: Acoustic Exploration (Sonoprobe) ■ Seabed Geological Survey: Single-Channel Acoustic Exploration ■ Depth Measurement: Narrow Multi-Beam *For more details, please download the PDF or contact us.

• Environmental Survey
• Geological Survey

Our "Image Enhancement Technology" can emphasize fine scratches and dirt on the surface of objects from regular photographs and camera footage. There are also applications in environmental surveys, seabed investigations, and structural integrity assessments. Please feel free to contact us if you have any inquiries. 【Features】 ■ Emphasizes fine scratches and dirt on the surface of objects from regular photographs and camera footage ■ Improves visibility of images and footage taken under poor conditions (backlighting, dark areas, underwater) *For more details, please download the PDF or contact us.

• Other civil engineering services
• photograph

Our company conducts concrete bridge condition surveys using physical exploration methods. Infrared thermography allows us to investigate areas that are otherwise inaccessible. By identifying the differences in radiative temperatures between deteriorated and sound areas, we can pinpoint the deteriorated sections and use this as a basis for detailed investigations. Additionally, we measure the minute vibrations from impacts using elastic wave tomography to determine the distribution of elastic wave (P-wave) velocities within the concrete. We evaluate the condition of the measurement points based on the correlation between the condition and the elastic wave velocity. Using RC radar, we non-destructively detect deformations within the concrete that cannot be visually confirmed. Defects, voids, foreign objects, etc., appear as abnormal reflection patterns of electromagnetic waves. *For more details, please download the PDF or contact us.*

• Other construction services
• Non-destructive testing

Our company offers road inspection and exploration using 3D radar surveying. By measuring three cross-sections—longitudinal (in the direction of travel), transverse (across the road), and horizontal (depth)—quickly and with high precision, we can rapidly and accurately obtain more detailed data. Additionally, the data obtained through analysis can be reflected in plans and cross-sectional diagrams alongside geological data and topographical information. 【Benefits of 3D Radar Surveying】 ■ It is possible to obtain multiple cross-sections, including longitudinal, transverse, and plan views, on-site. ■ The time required for what used to involve multiple back-and-forth trips in conventional radar surveying can be significantly reduced. ■ Exploration can be conducted while driving on public roads without road restrictions (can accommodate speeds of 50-60 km/h). ■ By emitting multiple electromagnetic waves simultaneously, it is possible to explore through the gaps in rebar mesh (depending on the spacing of the mesh). *For more details, please download the PDF or contact us.

• Geological Survey

"High-Precision Magnetic Survey" is a survey method used to distinguish magnetic responses that resemble small artillery shells. By arranging 15 magnetic gradient meters at 0.5m intervals on a survey frame and converting the digitally measured magnetic anomaly waveforms into contour maps, we can determine the likelihood of small artillery shells based on their patterns. This survey method allows us to narrow down the number of magnetic anomaly points that are targets for underwater exploration to one-third to one-fourth. 【Features】 - This survey method was developed to reduce the duration and cost of underwater exploration by selecting magnetic anomaly points that may indicate small artillery shells from the magnetic anomaly responses. - By converting the abnormal waveforms of dual-coil magnetic gradient meters into abnormal waveforms from a single coil, the contour patterns are simplified. For more details, please contact us or download the catalog.

• Harbor Construction
• Civil Engineering Company
• Other civil engineering services