ダイカ List of Products and Services

Mikune District, Sayo Town, Sayo County, Hyogo Prefecture ◆ Disaster from Typhoon No. 23 in 2004 In response to the damage caused by Typhoon No. 23 in 2004, the "Unit Net" was adopted at planned locations for the restoration of windfall trees and slope collapse areas, and construction was sequentially ordered based on the plan. ◆ Disaster from Typhoon No. 9 in 2009 While restoration work was progressing sequentially, we were hit by damage from Typhoon No. 9 in 2009. Slope collapses also occurred in surrounding areas, centered around the restoration plan area. There were still unaddressed areas within the restoration plan where slope collapses occurred, but in the adjacent area where the "Unit Net" had been installed, collapses were prevented. There were houses below the slope, but thanks to the installation of the "Unit Net," safety was successfully maintained. ● For more details, please download the materials.

Asakura City, Fukuoka Prefecture, Haki Hoshimaru, Shimizu Moto District From July 5 to 6, 2017, due to the inflow of warm and very humid air towards the stationary rainy front near the Tsushima Strait, a linear precipitation zone was formed and maintained, resulting in extremely heavy rain in the same location. This led to record-breaking rainfall in the northern Kyushu region and caused a heavy rain disaster. In Asakura City, Fukuoka Prefecture, where this heavy rain disaster occurred, unit nets were adopted and constructed in 2014 as part of a steep slope collapse prevention project. You can view the situation near the unit net construction site immediately after the disaster on the Geospatial Information Authority of Japan's YouTube account. The back side of the three-story building (elementary school) shown around 1:40 in the video below is the site where the unit net method was implemented. Despite numerous landslides occurring in the surrounding mountains, the area where the unit net method was applied did not experience any landslides. For more details, please refer to our company's website column and materials (available for download below).

This is a ground reinforcement construction method that connects rock bolts and unit nets with pressure plates to stabilize slopes through their mutual effects. It is often used on natural slopes because it allows for the preservation of trees, but it can also be applied in restoration work for collapsed areas and on cut slopes in conjunction with slope protection measures such as vegetation mats. 【Features】 - An environmentally considerate ground reinforcement construction method that allows for forest protection, landscape preservation, and greening of slopes. - No large machinery required; can be constructed in narrow sites using lightweight materials. - Compared to conventional methods that use frame supports and rebar insertion, it can reduce costs and shorten construction periods. - Applicable in cut slopes and collapsed slopes in combination with slope protection measures such as wire mesh and vegetation mats. - Proven results in the removal of special disaster warning areas (red zones). - Registered with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS registration number KK-010068-V (published until April 2017). ◆◇ You can download a collection of disaster recovery case studies from the link below! ◇◆

【Features】 ○ An environmentally friendly ground reinforcement method that allows for forest protection, landscape preservation, and greening of slopes. 〇 No large machinery required; can be constructed in narrow sites using lightweight materials. ○ Compared to conventional methods that use retaining walls and rebar insertion, it can reduce costs and shorten construction periods. 〇 Applicable even on cut slopes and collapsed slopes when used in conjunction with slope protection methods such as wire mesh and vegetation mats. ○ Registered with the Ministry of Land, Infrastructure, Transport and Tourism NETIS registration number KK-010068-V (published until April 2017). In road slope applications, it allows for early traffic opening compared to conventional methods and can be constructed in small spaces, making it a preferred choice. In areas where landscape consideration is necessary, such as tourist spots, it can also be made less noticeable with colored specifications. ◆ A collection of case studies can be downloaded for free from the link below! If you have any questions, please feel free to contact us!◆

In recent years, with the increase in rainfall, the importance of slope measures in urban areas has been rising. In residential areas and public facilities, slope measures often face limitations in terms of delivery and construction space. However, the unit net construction method allows for delivery and construction in smaller spaces compared to traditional shotcrete frame construction and rebar insertion methods. It is also ideal for areas where it is difficult to remove felled trees or where there is a desire to stabilize slopes while preserving greenery. We have a wealth of construction achievements, with approximately 1,000 cases and 710,000 square meters, including examples where special warning areas for sediment disasters (red zones) have been lifted. ◇◆ You can download the collection of construction examples from the link below. ◆◇ Please take a look!

【Features】 ○ An environmentally friendly ground reinforcement method that allows for forest protection, landscape preservation, and greening of slopes. 〇 It can be constructed even in narrow sites such as residential areas by using lightweight materials. ○ Compared to conventional methods using retaining walls and rebar insertion, it can reduce costs and shorten construction periods. 〇 Applicable in cut slopes and landslide-prone areas when used in conjunction with slope protection works such as wire mesh and vegetation mats. 〇 Proven track record of lifting special alert zones for sediment disasters (red zones). ○ Registered with the Ministry of Land, Infrastructure, Transport and Tourism NETIS under registration number KK-010068-V (published until April 2017). * For slopes with spring water, it is effective to combine with drainage work using "DK Drain Pipes." * We also have a collection of case studies from various fields, so please download from the catalog below!

In June 2025, disaster prevention measures for historic sites and cultural properties were incorporated into the first mid-term plan for national resilience. The unit net method has been adopted in many situations where landscape considerations are important. Moving forward, we aim to contribute to the protection of cultural properties and the prevention of human damage as a method that can balance landscape considerations and slope preservation. 【Features】 - This method suppresses surface landslides (up to about 3-4 meters thick). - Rock bolts and unit nets are connected by pressure plates, and their interaction stabilizes the slope. - Its open shape allows for minimal tree cutting. - The lightweight components excel in narrow areas, enabling efficient construction and shortening the construction period. 【Reasons for Adoption in Major Historic Sites and Cultural Properties】 - Landscape considerations are required near historical cultural properties. - The construction sites and access routes are narrow, making it impossible to secure large construction yards for methods like shotcrete frame construction. (The unit net is lightweight and easy to transport, eliminating the need for large construction yards.) - Cost reduction and shorter construction periods are possible compared to conventional methods, such as frame construction with rock bolts.

【Usage Scenarios】 - Rockfall measures and slope protection in areas prone to rust, such as coastal regions, volcanic areas, and hot spring areas. - Repair over rusted wire mesh (STK net is made of polyester, so it does not acquire rust.) 【Benefits of Implementation】 - Reduction in life cycle costs. - Improved work efficiency due to lightweight design. - Can be installed over rusted wire mesh, eliminating the costs and labor associated with removing existing wire mesh.

【Features】 - Made of 100% polyester, it is corrosion-resistant and lightweight (about 1/5 the weight of conventional φ3.2mm wire mesh). - It has a long-term durability of over 60 years. - Woven with a double twist in a hexagonal pattern, preventing continuous mesh breakage. - It does not rust and is suitable for repairs over deteriorated wire mesh.

The high-durability STK net is a rust-free polyester hexagonal net that serves as an alternative to wire mesh. Originally developed as a net for marine aquaculture, it has been repurposed for land applications, used for various purposes such as rockfall prevention, sediment control, wildlife damage prevention, and fall prevention. It is particularly adopted in the railway and road sectors due to its lightweight and durability (life cycle cost). You can download case studies from the link below. Please refer to it.

◇ Eliminating "Invisible Dangers" in Waterways and Ditches Waterways in daily living areas become unclear at night or during rainfall. By installing the STK net in waterways, the risk of pedestrians and cyclists falling is significantly reduced. ◇ Adaptable to All Sites The STK net can be installed to fit the shape of the site. • Complete coverage of waterways and ditches • Guard net for gaps under guardrails • Fall prevention on train platforms • Safety measures for river fences, etc. ◇ High Strength and Excellent Workability The STK net has the strength to withstand the weight of a person. The main features are as follows: • Choice of mesh size and wire diameter: Options like large mesh, Φ2.5 or Φ3.0 can be selected based on the site. • Quick installation: Delivered in rolls, it can be easily spread and secured. Falling accidents are not just due to "individual carelessness." There is an urgent need for hard measures to improve environmental factors. Let’s protect community safety with the quickly installable STK net.

1. Excellent durability and weather resistance • Long-term use possible: Made of 100% polyester with a durability of 60 years. • Strong against environmental changes: Minimal degradation from UV rays, corrosion, acids, and sulfur. 2. Workability and efficiency • Lightweight: Comparable in weight to conventional fiber nets, allowing for manual transport and installation even in steep sites. • Use of standing trees: Quick installation by securing to standing trees with a dedicated elastic belt, eliminating the need for upper and lower ropes. 3. Animal safety and repellent effect • Reduction of fatal accidents: The shape of the net (hexagonal) and the material's rebound force help prevent animal fatalities. • Repellent effect: The shape of the upper and lower edges of the net can also provide a repellent effect against animals. 4. Strength and ease of maintenance • Metal-like strength: Lightweight yet as strong as metal nets. • Easy repairs: Damaged wire mesh can be easily repaired in sections like patchwork. 5. Other functional advantages • Electrical insulation: Does not conduct electricity at all, allowing for use in conjunction with electric fences. • Maintenance of landscape: Excellent transparency ensures that the surrounding landscape is not compromised.

In June 2025, disaster prevention measures for historic sites and cultural properties were incorporated into the first mid-term plan for national resilience. The unit net method has been adopted in many slope disaster prevention scenarios that consider landscape. Moving forward, we aim to contribute to the protection of cultural properties and the prevention of human damage as a method that can balance landscape consideration and slope preservation. 【Features】 - This method suppresses surface landslides (up to about 3-4 meters thick). - Rock bolts and unit nets are connected by pressure plates, stabilizing the slope through their interaction. - Its open shape allows for minimal tree cutting. - The lightweight components excel in construction in narrow areas, enabling a reduction in construction time. 【Reasons for Adoption in Major Historic Sites and Cultural Properties】 - Landscape consideration is required near historical cultural properties. - The construction site and access routes are narrow, making it impossible to secure large construction yards for methods like shotcrete. (Unit nets are lightweight and easy to transport, eliminating the need for large construction yards.) - Cost reduction and shortened construction time are possible compared to conventional methods, such as frame + rock bolt construction.