一般社団法人　全国落石災害防止協会 List of Products and Services

This document introduces the construction results of stone masonry repair using the Rock Adhesion DK Bond method. The Rock Adhesion DK Bond method is a technique that stabilizes unstable rock masses by bonding them to stable bedrock using an adhesive material (DK Bond Mortar). We provide information on "stone masonry (stone wall) repair and reinforcement using the Rock Adhesion DK Bond method," "construction procedures," and various construction results. [Contents] ■ Stone masonry (stone wall) repair and reinforcement using the Rock Adhesion DK Bond method ■ Stone masonry (stone wall) repair construction procedures ■ Stone masonry (stone wall) repair construction results *For more details, please refer to the PDF document or feel free to contact us.

• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

The "Rock Adhesive DK Bond Method" is a rockfall prevention technique that uses adhesive material (DK Bond Mortar) to bond unstable rock masses to solid bedrock, thereby achieving stability through integration. Since the development of this method, it has been implemented on a national scale for over 40 years, with more than 3,900 successful projects. It can be applied to steep slopes, high altitudes, and very unstable boulders, and it possesses seismic performance that can withstand massive earthquakes. We are currently offering a document summarizing our construction achievements. 【Features】 ■ Effective for boulders and high-altitude rocks ■ Easy to combine with other methods ■ Effective for preserving natural landscapes *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method

The "Rock Adhesion DK Bond Method" is a technique that uses adhesive material (DK Bond Mortar) to bond unstable rock masses to solid bedrock, thereby achieving stability by integrating them. The method aims to prevent the fall of floating stones and rolling stones that are the source of rockfalls, and is applied directly to the source of rockfall. 【Features】 ■ Effective for large boulders and high-altitude rocks ■ Easy to combine with other methods ■ Effective for preserving natural landscapes *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce examples of applications for the rockfall prevention construction method by Daini Kensetsu Co., Ltd. Our rockfall prevention method is adaptable to "landscape conservation areas." For example, this includes scenic spots and natural parks. Without making significant alterations to the natural environment, we utilize surrounding stone fragments (or stone materials), resulting in a finish that is close to natural conditions. Additionally, landscape restoration work through coloring and other methods is also possible. Please feel free to consult us when needed. 【Features】 ■ A method that does not significantly alter the natural environment ■ Utilization of surrounding stone fragments (or stone materials) ■ Finish that can closely resemble natural conditions ■ Landscape restoration work through coloring and other methods is also possible *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods
• Civil Engineering Method
• Earthquake-resistant construction method

We would like to introduce examples of applications for the rockfall prevention methods of Daini Kensetsu Co., Ltd. Our rockfall prevention methods can be adapted to "steep slopes and high places." For example, they can be used in locations where machinery cannot be utilized. The construction is primarily manual labor, and it is a method that does not require large-scale temporary structures or construction equipment. Please feel free to consult us when needed. 【Features】 ■ Primarily manual labor ■ A method that does not require large-scale temporary structures or construction equipment *For more details, please refer to the PDF materials or feel free to contact us.

• Civil Engineering Method
• Renovation and repair methods
• Earthquake-resistant construction method

We would like to introduce examples of applications for the rockfall prevention method by Daini Kensetsu Co., Ltd. Our rockfall prevention method is adaptable even to "very unstable large boulders." For example, this includes large boulders on ridges. During construction, we ensure safety by performing temporary adhesion without applying vibrations that pose a high risk of rockfall. Additionally, it is not affected by the size or shape of the target boulder. 【Features】 ■ A method that does not apply vibrations that pose a high risk of rockfall ■ Ensures safety during construction through temporary adhesion ■ Not affected by the size or shape of the target boulder *For more details, please refer to the PDF materials or feel free to contact us.

• Civil Engineering Method
• Earthquake-resistant construction method
• Renovation and repair methods

We would like to introduce examples of the rockfall prevention construction methods used by Daini Kensetsu Co., Ltd. Our rockfall prevention methods can also be adapted for "emergency measures and first aid." For instance, they can be utilized in urgent situations where "time is of the essence." There is no need to acquire land for construction, and the temporary structures and construction equipment are minimal, allowing for a short construction period. Additionally, our specialized technicians respond quickly from investigation and design to construction. 【Features】 ■ No need to acquire land for construction ■ Minimal temporary structures and construction equipment, allowing for short construction periods ■ Specialized technicians respond quickly from investigation and design to construction *For more details, please refer to the PDF materials or feel free to contact us.

• Civil Engineering Method
• Earthquake-resistant construction method
• Renovation and repair methods

We would like to introduce examples of applications for the rockfall prevention construction method by Daini Kensetsu Co., Ltd. Our rockfall prevention construction method is adaptable for "preliminary work for disaster recovery," for instance, in cases where "immediate effectiveness is desired." It requires no effort for preparatory or temporary work, allowing for immediate commencement of construction. DK Bond Mortar can achieve the specified adhesion strength within 7 days of curing. 【Features】 ■ No effort required for preparatory or temporary work ■ Immediate commencement of construction possible ■ DK Bond Mortar can achieve the specified adhesion strength within 7 days of curing *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods
• Civil Engineering Method
• Earthquake-resistant construction method

We would like to introduce examples of applications for the rockfall prevention methods of Daini Kensetsu Co., Ltd. Our rockfall prevention methods can be adapted for use in conjunction with other rockfall countermeasures. For example, they can be applied simultaneously for measures against large boulders and small boulders. Please feel free to consult us when needed. 【Features】 ■ Applicable when measures against large boulders and small boulders are carried out simultaneously ■ Can be used in conjunction with rockfall prevention works and protective works *For more details, please refer to the PDF materials or feel free to contact us.

• Earthquake-resistant construction method
• Renovation and repair methods
• Civil Engineering Method

We would like to introduce the "Seismic Performance Achievements" of Daini Kensetsu Co., Ltd. Our rockfall prevention method is designed to withstand massive earthquakes and has proven effective in various locations across Japan. It showed no deformation even during the Great Hanshin-Awaji Earthquake, which registered a magnitude of 7 in 1995, and has successfully withstood numerous earthquakes since then, including the 2000 Tottori Prefecture Western Earthquake and the 2007 Noto Peninsula Earthquake. If you have concerns regarding rockfall prevention methods, please feel free to consult us. 【Seismic Achievements】 ■ Great Hanshin-Awaji Earthquake (Magnitude 7) ■ Tottori Prefecture Western Earthquake (Magnitude 6+) ■ Geiyo Earthquake (Magnitude 6-) ■ Noto Peninsula Earthquake (Magnitude 6+) ■ Great East Japan Earthquake (Magnitude 6-) ■ Kumamoto Earthquake (Magnitude 7) *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method
• Renovation and repair methods
• Civil Engineering Method

We would like to introduce examples of "rockfall prevention construction methods" by Daini Kensetsu Co., Ltd. Our rockfall prevention methods are applied in various locations. The DK Bond method, which does not require formwork, is effective for stabilizing high places and large boulders, as well as areas with a high risk of collapse. As a result, we have a track record of construction in steep slopes across Japan, as well as in deteriorated embankments, stone walls, artificial structures, and the restoration of cultural properties. If you are facing issues with rockfall prevention methods, please feel free to consult with us. 【Examples of Construction】 ■ Stabilization of large boulders ■ Stabilization of collapsed rocks ■ Fixing of slope cracks ■ Repair of deteriorated embankments and artificial structures ■ Restoration of stone walls and cultural properties *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods
• Earthquake-resistant construction method
• Civil Engineering Method

On April 13, 2013, a strong earthquake registering a magnitude of 6 occurred in Sumoto City, Hyogo Prefecture, causing significant damage in the local area. This document presents records confirming that there were no abnormalities such as cracks or delamination at the construction site of the adhesive work, which had been completed 23 years prior. [Contents Included] ■ Sumoto City, Kojiya, Hyogo Prefecture - 4 years after construction (photos) ■ Okuyama, Ashiya City (Rock Garden) - 2 years after construction (photos) ■ 23 years after construction (photos) *For more details, please refer to the PDF document or feel free to contact us.

• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

This document introduces examples of the rock adhesion "DK Bond Method" through comparison photos before and after construction. [Contents] ■ Rock Adhesion DK Bond Method Construction Achievements ■ Client ■ General Contractor ■ Project Name ■ Prefecture/City/Town/Village *For more details, please refer to the PDF document or feel free to contact us.

• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

This document is a collection of follow-up investigation photographs related to the Rock Bond DK construction method. It includes observations from construction sites affected by major earthquakes in Japan, including the 1995 Great Hanshin-Awaji Earthquake, as well as recent large-scale earthquakes. The content presents follow-up investigations conducted over "10 years, 15 years" since those events. [Contents] ■ Greetings ■ Follow-up investigation from 1997 construction ■ Follow-up investigation from 2002 construction ■ Follow-up investigation from 2003 construction ■ List of follow-up investigation sites for DK Bond method in Kochi Prefecture ■ Follow-up investigation after the Geiyo Earthquake *For more details, please refer to the PDF document or feel free to contact us.

• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

This document is a record of construction performance site investigations related to the western Tottori earthquake and the Geiyo earthquake. It includes information on the damage conditions in various areas during the occurrence of the western Tottori earthquake (M7.3, intensity 6 strong) and the Geiyo earthquake (M6.7, intensity 6 weak), as well as the status of rock bonding methods. Additionally, many photographs of construction sites are also presented. [Contents] - Report on the tracking investigation of construction performance sites near the epicenter (western Tottori earthquake) - Report on the tracking investigation of construction performance sites around the epicenter (Geiyo earthquake) - DK Bond method rock bonding rockfall prevention work - Fundamental principles of rock bonding methods - Achievements of the rock bonding DK Bond method *For more details, please refer to the PDF document or feel free to contact us.

• others
• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

The Great Hanshin-Awaji Earthquake, which occurred in the early morning of January 17, 1995, vividly demonstrated the terrifying nature of urban-subduction earthquakes. In the disaster area, there were several locations where rockfall prevention work was carried out using the DK Bond method. Our company conducted a follow-up survey on the impact of the earthquake on these construction sites from mid-February to early March, one month after the disaster. This document includes the survey records of those construction achievements. [Contents] ■ Investigation of the disaster area ■ Overview of the earthquake ■ Conditions of adjacent non-construction areas and rockfall occurrences *For more details, please refer to the PDF document or feel free to contact us.

• Rockfall prevention agent
• Other earthworks, foundation works, and exterior floors
• Earthquake-resistant construction method

We would like to introduce the construction achievements of the DK Bond Method. The implementation of this method closes cracks and openings to prevent loosening of the bedrock due to weathering, while also dispersing concentrated stress in the area. This results in excellent durability against repeated loads such as earthquakes and demonstrates a high rockfall prevention effect. 【Construction Achievements】 ■ Project Number: 3579 ■ Client: Okayama Prefectural Mimasaka Bureau of Construction ■ General Contractor: Nakaniishi Kogyo Co., Ltd. ■ Project Name: 52-18-52 2-18-1 Public Road Construction (Slope Work) ■ Prefecture: Okayama ■ Construction Location: Kamisaihara, Kagamino Town, Tomata County ■ Construction Start Date: September 2018 ■ Construction End Date: November 2018 *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce the construction achievements of the DK Bond Method. The implementation of this method closes crack openings and prevents loosening of the rock mass due to weathering, while also dispersing the stress concentrated in the area. This results in excellent durability against repeated loads such as earthquakes and demonstrates a high rockfall prevention effect. 【Construction Achievements】 ■Project Number: 3606 ■Client: Izumo City ■Main Contractor: Mihara Corporation ■Project Name: Disaster Prevention Rockfall Prevention Work for Machitakanishi Line ■Prefecture: Shimane ■Construction Location: Sada Town, Izumo City, Hanbe ■Construction Start: December 2018 ■Construction End: February 2019 *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce the construction results of the DK Bond Method. The implementation of this method closes crack openings and prevents loosening of the bedrock due to weathering, while also dispersing concentrated stress in the area. This results in excellent durability against repeated loads such as earthquakes and demonstrates a high rockfall prevention effect. 【Construction Results】 ■ Client: Hyogo Prefectural Nakaharima Bureau ■ General Contractor: Tateiwa Co., Ltd. ■ Project Name: Landslide Countermeasure Work in the Nagase Area (Part 2) ■ Prefecture: Hyogo ■ Construction Location: Kamikawa Town, Kanzaki County ■ Construction Start: April 2018 ■ Construction End: December 2018 *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce the construction achievements of the DK Bond Method. The implementation of this method closes crack openings and prevents loosening of the bedrock due to weathering, while also dispersing the concentrated stress in the area. This results in excellent durability against repeated loads such as earthquakes and demonstrates a high effectiveness in preventing falling rocks. 【Construction Achievements】 ■Project Number: 3559 ■Client: Hiroshima Prefectural Eastern Construction Office ■Main Contractor: Amano Kiko Co., Ltd. ■Project Name: Fuchu Up and Down Line Road Disaster Prevention Work (Fuchihara Section) ■Prefecture: Hiroshima ■Construction Location: Kawamachi, Fuchu City ■Start Date: June 2018 ■End Date: September 2018 *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce the construction achievements of the DK Bond Method. The implementation of this method closes crack openings and prevents loosening of the bedrock due to weathering, while also dispersing concentrated stress in the area. This results in excellent durability against repeated loads such as earthquakes and demonstrates a high effectiveness in preventing falling rocks. 【Construction Achievements】 ■Project Number: 3563 ■Client: Kyoto Prefectural Forestry Office ■Main Contractor: Sanwa Construction Co., Ltd. ■Project Name: FY 2017 Erosion Control Project (Emergency Erosion Prevention) (National Treasury Debt Obligation) ■Prefecture: Kyoto Prefecture ■Construction Location: Kurama Honmachi, Sakyo Ward, Kyoto City ■Construction Start: June 2018 ■Construction End: August 2018 *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method