We construct the general slope countermeasure works such as landslide prevention works. And we also undertake digging underground water wells and construct the environmentally friendly water-sprinkling / non-water-sprinkling snow melting facilities that effectively utilize underground water and geothermal heat. In our recent technology development, we invented "Karuwaza Sakkun". This simplified drilling system is very useful for preventing sediment disasters in residential land development sites and drilling in the sites where is in urgent such as slope disaster sites. The salient feature of this method is to be able to drill quickly at low cost when drilling depth is relatively shallow or where the transportation and installation of a typical drilling machine is difficult due to space etc.
we consider natural environment such as ecosystems and landscapes based on the characteristics of regions. And we strive to further improve our skills in the rapidly changing technological innovations and respond to the needs of the times with well-prepared management and promptness.
Landslide prevention works include the restraint works that restrain landslide fluctuations by changing natural conditions such as topography and groundwater, and the deterrence works that deter landslides by directly adding resistance to the landslide mass that is going to slide by mean of structures such as steel pipe piles, anchors and so on.
As the restraint works, we construct the horizontal boring works that drain shallow groundwater, the water collecting and drainage boring works that bore catchment wells and drain groundwater from it, the landslide head removal works that remove the load of landslide head, and the embankment works that construct embankment at the ends of landslides.
As the deterrent works, we construct the anchor works which aim to counteract landslides by fixing anchors in a stable ground and utilizing the tensile strength of steel cables fixed to anchors. And we also construct the steel pipe pile works that directly resist sliding by inserting steel pipes to immovable ground to add shear resistance force and bending resistance force to landslide.
Slope protection works aim to stabilize slopes by covering its surfaces that appeared due to cutting and embankment works.
In this works, we carry out following methods:
“Slope greening method” that plants vegetation to the slopes of cut/embankment, maintains the stability of its growth base as necessary and manages the grown vegetation.
“Slope protection method” that uses the structures such as crib works, mortar / concrete spraying works, and reinforcing bar insertion works.
Using drilling machine, we drill the water wells for melting snow, agricultural use etc., In addition, we also drill the heat collecting wells for snow melting utilizing geothermal and the wells for non-water-sprinkling snow melting.
To deal with wide range of needs, we conduct the surveys and designs such as the efficient and reliable maintenance of social infrastructure: roads, rivers and so on, and renewal of aging facilities.
On the other hand, toward developing safe and reliable social infrastructure, we conduct field surveys, monitoring, observations, proposing and designing countermeasure methods against slope collapses and falling rocks which are caused by heavy rains and earthquakes which have been increasing in recent years.
In addition, we provide services with our high skills for the inspections for social infrastructure, diagnostic surveys, and the renewal designs of social infrastructure that has deteriorated and renewal due coming.
We will continue to provide the services that adopt changing social needs by further improving our high skill cultivated through years of experience.
We figure out the behavior of soft ground and consider appropriate measures.
To comprehend the amount of soft ground subsiding and the time required for consolidation, it is necessary to clarify its properties and characteristics. In addition to boring surveys, we collect target soil from ground without disturbing and conduct indoor soil tests. Even if collecting samples is difficult, we can analyze from standard values. Based on its analysis results, we propose appropriate soft ground countermeasure works.
We propose the construction methods for cut and embankment slopes, natural slopes, rivers, etc. that can be expected to have continuous effects with applicable technology and reasonable costs
To clarify the circulation mechanism and quantitative evaluation of water in a target area, it is necessary to understand information on the flow of water. We measure groundwater level, flow direction and velocity to obtain more detailed groundwater information.
We propose landslide monitoring and the emergency measures for unstable slopes after landslides has occurred or signs of landslides are observed. If necessary, we rush to the sites of large-scale disasters and summarize its findings concerning the occurrence mechanism and emergency measures etc.
As the geological surveys of building foundation, slope surfaces, landslide sites etc., we conduct boring surveys, hole horizontal loading tests, simple bearing strength measurements, cone penetration tests, Swedish weight sounding tests, etc.
We engage in business related to landslide. Landslides are often caused by earthquakes, snow melting and extreme weather such as heavy rain. They damage houses, roads, rivers, farmlands, forests, etc., and have tremendous impact on people's livelihoods.
We prepare the survey plans for such landslides, conduct the surveys and analyses, design countermeasures, and provide advice on the procedures of constructing landslide prevention works and ensuring safety.
As the countermeasures after landslides occur, we propose appropriate monitoring systems and other non-structural measures if there is a risk of damage spreading.
In addition, we are commissioned to draw up documents based on the national law “Sediment Disasters Prevention Act” from local government. Concretely, we form data that appoints the district where is possible to be damaged when landslides occur. we assist preparation of the documents for applications for designation of landslide prevention area, the documents for judgement of landslide occurrence, and the procedures for designation of sediment disaster warning area based on the Sediment Disasters Prevention Act. In recent years, we also conduct the inspection for the maintenance and management of landslide prevention facilities, and plan and design renewal for aging facilities.
We conduct the sand erosion control surveys in mountain streams and the surveys in landslide areas.
To predict landslides, improve warning and evacuation systems, and design prevention works through slope stability analyses, it is necessary to clarify the mechanism and characteristics of landslide occurrence. Therefore, we survey topography, geology and groundwater in landslide areas, and landslide behavior. The landslide surveys include surface geological surveys, boring surveys, borehole camera surveys, groundwater logging, groundwater tracking, the soil tests of sliding surface, and landslide dynamics observations.
We design the slope countermeasures such as horizontal boring works for landslide prevention, catchment wells, steel pipe piling works, anchor works, embankment, soil removal works, and slope protection works for steep slope countermeasure.
We demonstrate the mechanism of landslide occurrences based on landslide block classification, the position of sliding, soil mechanics properties, groundwater condition, etc. We identify destabilized slopes by earthquake response analyses based on anticipated seismic motions. In addition, utilizing 3D data, we create geological maps and conduct landslide collapse simulations and groundwater analyses, and we also conduct 3D model analyses by using GIS.
We inspect soil erosion control facilities, landslide prevention facilities, and slope protection works, and prepare plans for extending the life span of facilities and proposing the methods for maintaining and repairing.