Development and Adoption of Implant-Type Seawalls in Coastal Areas

「技研製作所、タイの護岸整備事業で「インプラント工法™」継続採用🔒」

「As a result, the method was adopted for restoration of national highways damaged by typhoons, widening of national highway bypasses, seawall construction and fishing-port revetment improvements, among other projects, and the number of projects using it remained solid.」

「While adoption of the method remained solid, construction progressed smoothly on coastal levee renovation in Kochi Prefecture as a countermeasure against Nankai Trough megathrust earthquakes, revetment renovation in Tokyo as an earthquake and storm-surge countermeasure, revetment reinforcement in the Hijikawa River basin in Ehime Prefecture, which was affected by the July 2018 torrential rains in western Japan, and fishing-port revetment reinforcement in Hokkaido, among other projects.」

「The number of projects using the method remained solid, including seismic-resilience works for aging fishing ports and port access roads, scour protection for bridges, new seawall construction, and permanent restoration of cut slopes that collapsed in torrential rain disasters.」

「As a result, adoption increased steadily for seismic reinforcement of river revetments, improvement of port revetments, restoration of national roads and diversion dikes damaged by torrential rains, and construction of retaining walls for expressway widening.」

「Among the projects undertaken by group company 株式会社技研施工, a large-scale project to construct a resilient coastal levee using an Implant structure in Ofunato, Iwate Prefecture, as part of restoration following the Great East Japan Earthquake, with a total length of 750 m, was completed in November 2022 after approximately 4 years and 1 month from the start of construction in October 2018.」

「In addition to infrastructure development such as seawalls for earthquake, tsunami and storm-surge countermeasures, river revetment renovation for flood control, expressway construction and port facility improvements, the method was also adopted for water barriers protecting private-sector factories from flooding as a pre-disaster measure. The scope of application expanded, and adoption increased steadily.」

「Focusing primarily on disaster prevention and mitigation and national resilience measures for the future, including renovation of seawalls to prepare for earthquakes, tsunamis and storm surges, and seismic retrofitting and flood-control improvements to coastal and river revetments」

「As part of efforts to move away from the principle of using earthen embankments, construction of an Implant Levee within the body of a river levee is progressing on the Kokubungawa earthquake and storm-surge countermeasure project in Kochi Prefecture. The plan is to monitor the behavior of the levee body, corrosion of the steel sheet piles and deformation over the long term in order to demonstrate the performance of the Implant Levee.」

「In its domestic method-proposal activities, the company worked to expand the Implant Method's application range in road extension and improvement projects, including expressway renewal, port development projects involving the substantial deepening of quay walls, and liquefaction countermeasures at private-sector plants, while focusing on disaster recovery and reconstruction, disaster prevention and mitigation for the future, and national resilience initiatives. Adoption of the method increased steadily.」

「In its domestic method-promotion activities, the company worked to expand the Implant Method's application range in road extension and improvement projects, including expressway renewal, and port development projects involving the substantial deepening of quay walls, while focusing on disaster recovery and reconstruction, disaster prevention and mitigation for the future, and national resilience initiatives. Adoption of the method increased steadily.」

「In its domestic method-promotion activities, the company worked to expand the Implant Method's application range, focusing on national resilience initiatives such as disaster recovery and reconstruction, advance disaster-prevention and disaster-mitigation measures, and measures to address aging social infrastructure. Adoption increased for coastal levee and quay-wall improvements and expressway renewal projects.」

「In domestic construction, although the start of some projects was delayed after the state of emergency was lifted, work generally progressed smoothly without any suspension. Projects included coastal levee construction in Iwate and Kochi prefectures, disaster restoration works following last year's typhoon damage, landslide-control works for the Kyushu Shinkansen, and expressway improvement works.」

「As a result, adoption of the Implant Method remained solid, and projects including coastal levee reinforcement and quay-wall improvements to accommodate cruise ships progressed.」

「As in the previous fiscal year, adoption of our construction methods in disaster restoration and disaster prevention and mitigation projects remained solid. Levee and other projects continued in Iwate Prefecture, which was affected by the Great East Japan Earthquake, and in Kochi and Wakayama prefectures, where damage from a Nankai Trough megathrust earthquake is anticipated.」

「As in the previous fiscal year, adoption of our construction methods in disaster restoration and disaster prevention and mitigation projects remained solid. Levee and other projects were carried out in Iwate and Miyagi prefectures, which were affected by the Great East Japan Earthquake, and in Kochi and Wakayama prefectures, where damage from a Nankai Trough megathrust earthquake is anticipated.」

「As in the previous fiscal year, adoption of our construction methods in disaster restoration and disaster prevention and mitigation projects remained solid. Levee and other projects continued in Iwate Prefecture, which was affected by the Great East Japan Earthquake, and Kochi Prefecture, where damage from a Nankai Trough megathrust earthquake is anticipated.」

「As in the previous fiscal year, adoption of our construction methods in disaster prevention and mitigation projects remained solid. We carried out levee projects in Iwate Prefecture, which was affected by the Great East Japan Earthquake, Kochi Prefecture, where damage from a Nankai Trough megathrust earthquake is anticipated, and Wakayama Prefecture, among others.」

「In the current environment, adoption of the Implant Method has been expanding, including Implant Levees along the coasts of Wakayama and Shizuoka prefectures and river levee projects in the Tokyo metropolitan area, Osaka Prefecture and elsewhere.」

「As in the previous fiscal year, adoption of our construction methods in disaster prevention and disaster mitigation projects remained solid. In Hokkaido, where a sales office was opened in June, inquiries continued for projects including restoration works following the torrential rain disaster in Hokkaido in August 2016, and some were completed during the fiscal year under review.」

「Most of the Implant Levee projects ordered by the company for coastal levee improvement works in Kochi Prefecture as a countermeasure against Nankai Trough earthquakes have been completed. The company is now proceeding with proposals for construction methods and order-seeking activities for new seismic-resilience projects.」

「Based on the track record of coastal levee improvement works in Kochi Prefecture as a countermeasure against Nankai Trough earthquakes, and new seawall construction and height-raising works in Iwate and Miyagi prefectures as part of post-earthquake restoration, adoption of Implant Levees, which are resilient against earthquakes and tsunamis, is expanding nationwide.」

「Orders for Implant Levees, which are resilient against earthquakes and tsunamis, remained at a high level. Based on the track record of coastal levee improvement works in Kochi Prefecture undertaken as a countermeasure against Nankai Trough earthquakes, adoption for river levee reinforcement and other applications has expanded in Osaka, Tokushima and other areas. The Implant Method, including Implant Levees, has entered the nationwide adoption phase.」

「In the press-in construction business, orders for Implant Levees, which are resilient against earthquakes and tsunamis, remained at a high level. In Iwate and Miyagi prefectures, where reconstruction projects are progressing, adoption is increasing for new seawall construction and height-raising works as a method that reduces labor requirements and manpower through systemized machinery. Based on the track record of coastal levee improvement works in Kochi Prefecture as a countermeasure against Nankai Trough earthquakes, adoption for river levee reinforcement and other applications has expanded in Osaka, Tokushima and other areas. The advantages of the Implant Method are steadily gaining acceptance, and the method has entered the nationwide adoption phase.」

「In Iwate and Miyagi prefectures, where post-earthquake restoration works are progressing, adoption is increasing for new seawall construction and height-raising works as methods that reduce labor requirements and manpower through systemized machinery. As a countermeasure against Nankai Trough earthquakes, more than 10 km of coastal levee improvement works have been carried out in Kochi Prefecture. Based on this track record, adoption for river levee reinforcement is progressing in Tokushima and Osaka prefectures, among others. The advantages of the Implant Method are steadily gaining acceptance, and the method has entered the nationwide adoption phase.」

「In addition to the conventional method of continuously pressing steel sheet piles and steel pipe piles into the ground to construct strong levee bodies, adoption is expanding for construction methods based on our proprietary technologies, including the Skip Rock Method, which enables rational wall construction at an early stage through staggered installation of steel pipe piles, and the Combi Gyro Method, which offers excellent water-tightness and rigidity with economic advantages. Construction results are steadily increasing in Iwate and Tokushima prefectures, as well as at Kochi Coast.」

「Development of the Implant Levee at Kochi Coast, undertaken since 2012 as a countermeasure against Nankai Trough earthquakes, has entered its fourth year, and work in the Nangoku section is continuing. As larger-diameter piles are increasingly used in levee and retaining-wall construction designed to withstand substantial external forces, the GRV2540 Gyro Piler, which can handle large-diameter steel pipe piles with a diameter of 2 m, began operating in March at a river improvement project in Sapporo, Hokkaido. Its track record is expanding, including adoption at a road retaining-wall project in Akiruno, Tokyo, together with the CB5-2 Clamp Crane, which handles large-diameter piles.」

「Development of Implant Levees is steadily progressing in coastal areas across Japan. In Shiogama, Miyagi Prefecture, the Combi Gyro Method (patent pending), which uses a combination of Hat-shaped Steel Sheet Piles 900 and steel pipe piles to construct an economical wall structure with excellent water-tightness and rigidity, was adopted for the first time in seawall restoration works. In Ofunato and Kamaishi, Iwate Prefecture, the Skip Rock Method, which enables rational wall construction at an early stage through staggered installation of steel pipe piles, was adopted for seawall redevelopment works, expanding its track record. Development of Implant Levees at Kochi Coast as a countermeasure against Nankai Trough earthquakes, which began in 2012, has entered its fourth year, and extension works in the Nangoku section remain scheduled.」