中日建設株式会社／一般社団法人 IPH工法協会 List of Products and Services

The civil engineering heritage "Omiya Bridge" in Saijo City, Ehime Prefecture, completed in 1927 (Showa 2), was approaching the end of its lifespan as a bridge after nearly 90 years. The Omiya Bridge, deemed a dangerous bridge (health assessment category "III," with internal cavities and leakage), underwent repair work using the "IPH method." By reinforcing the hollow parts inside the concrete with resin, the strength recovery work was completed without dismantling the original structure. Additionally, the construction period was shorter than that of a "replacement," taking into consideration the surrounding environment, and with the cooperation of local government and universities, the work was able to proceed smoothly. *It has been confirmed through ultrasonic surveys by Ehime University that the structural strength has been restored. 【Case Overview】 ■Location: Civil Engineering Heritage Omiya Bridge ■Method Used: IPH Method ■Award Information: 2020 All Construction Award, Road Division ■Construction Company: Oono Painting Co., Ltd. (IPH Method Association - Shikoku Regional Authorized Dealer) https://www.oono-toso-ten.jp/ They are responsible for the construction and promotion of the IPH method in the four prefectures of Shikoku, as well as providing technical and construction guidance to members. *Case video is currently available at the bottom of the page. *For detailed information about the method, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

At our company, Chūnichi Construction, we are implementing the concrete repair and reinforcement method known as "IPH Method." The conventional concrete repair method, "low-pressure resin injection method," often failed to allow the resin to reach the internal structure of the concrete due to the obstruction of air inside. In contrast, the "IPH Method" allows the injected resin to diffuse radially within the concrete while removing the air present inside the structure, enabling it to fill even the finest cracks at the ends. This detailed filling enhances the adhesion strength between the rebar and concrete, providing anti-corrosion effects as well. We have a significant track record of adoption in tunnels, bridges, and public works projects, and in recent years, there has been a notable increase in inquiries from large private facilities and factories! 【Construction Achievements in Aichi Prefecture (Partial Excerpt)】 ◇ May 2018: Toyoda City, Aichi Prefecture Construction work for seismic reinforcement of the Kanpachi Water Pipe Bridge as part of the Yahagi River Comprehensive Phase II Agricultural Disaster Prevention Project. ◇ March 2019: Okazaki City, Aichi Prefecture Box culvert repair work as part of road disaster prevention construction. ◇ March 2019: Nishikasugai District, Aichi Prefecture Combined construction for the improvement of the internal roads at Nagoya Airport (Phase 5) and civil engineering facilities (Phase 18). *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

The conventional concrete repair method known as "low-pressure resin injection" often fails to reach the internal structure of the concrete due to the obstruction of air inside. In contrast, the concrete repair and reinforcement method "IPH method" allows the injected resin to diffuse radially within the concrete while removing the air present inside the structure, effectively filling even the finest cracks at the ends. This filling enhances the bond strength between the rebar and concrete, providing anti-corrosion effects as well. Recently, there have been many successful applications in public works projects such as tunnels and bridges, and inquiries from private large facilities and factories have significantly increased in recent years! ~ We are currently offering the latest construction case collection for download as a PDF! ~ 【Features of the IPH Method】 ■ Extracts air from inside the cracks and releases it outside ■ Achieves high-density filling through ultra-low-pressure injection ■ Restores and enhances the strength of the internal structure ■ By filling voids, it provides water-stopping, anti-corrosion effects, neutralization suppression, and salt damage countermeasures ■ Can be performed without stopping facility usage * For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods

This case study collection mainly summarizes construction examples of the IPH method (Internal Pressure Reinforced Joint Method) specifically focused on Aichi Prefecture. In addition to wall surfaces, it includes projects related to coastlines, factories, revetments, and tunnels, as well as construction examples of repairs for underground tanks and airports. We encourage you to read it. 【Contents (Excerpt)】 ■ Wall Surface: Cracks in Observation Deck Wall ■ Coastline: Coastal Cracks ■ Factory: Cracks and Uplift in Factory Machinery Foundations ■ Revetment: Cracks in Revetment ■ Tunnel: Tunnel Water Leakage 【Applications】 ■ Repair and reinforcement of floating cracks in concrete and mortar in various fields of civil engineering and architecture, as well as water stopping ■ Measures to prevent spalling [Civil Engineering] → Dams, levees, tunnels, retaining walls, bridges, bridge piers, slabs, tracks, subways, sediment control dams [Architecture] → Residential foundations, exterior walls, tile substrates, parking lots, cracks in blocks *For more details, please refer to the PDF document or feel free to contact us.

• Reinforcement and repair materials

This case study collection summarizes construction examples of the IPH method (Internal Pressure Filling Reinforcement Method). In addition to repair work on columns, it introduces construction examples for bridges, quay walls, embankments, snow shelters, as well as repairs for lighthouses and steep slope retaining walls. We encourage you to read it. 【Contents (Excerpt)】 ■ Columns: Janka repair work ■ Bridges: Horizontal beams and floor slabs (drying and leakage cracks) repair work ■ Quay walls: Drying crack repair work ■ Embankments: Leakage crack repair work ■ Snow shelters: Cross-section joint injection repair work 【Applications】 ■ Repair and reinforcement of floating cracks in concrete and mortar in various fields of civil engineering and architecture, as well as water stopping ■ Measures to prevent spalling [Civil Engineering] → Dams, levees, tunnels, retaining walls, bridges, bridge piers, floor slabs, tracks, subways, sediment control embankments [Architecture] → Residential foundations, exterior walls, tile substrates, parking lots, block cracks *For more details, please refer to the PDF document or feel free to contact us.

• Reinforcement and repair materials

In conventional low-pressure resin injection methods, the resin sometimes fails to reach the internal structure of the concrete due to the obstruction of air inside. With the concrete repair and reinforcement method "IPH method," the resin injected while removing the air present inside the structure can now diffuse radially within the concrete, allowing it to fill even the finest cracks at the ends. By filling in detail, it enhances the adhesion strength between the rebar and concrete, and also provides anti-corrosion effects, as confirmed by technical evaluations from the Japan Society of Civil Engineers. 【Features】 - Extracts air from inside the cracks and releases it outside - Achieves high-density filling through ultra-low-pressure injection - Restores and enhances the strength of the internal structure - Provides anti-corrosion effects, neutralization suppression effects, and measures against salt damage by filling voids - Construction can be carried out while utilizing facilities such as roads, bridges, and buildings *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods

The "IPH method" involves drilling into the structure and rapidly injecting resin to create airflow, which extracts air from within the cracks and releases it outside, replacing it with resin. This principle allows the resin to fill and penetrate even the finest cracks, curing at ultra-low pressure. As a result, it is a method that can bond and reinforce concrete, integrating and densifying the structure, thereby restoring its strength. 【Features】 ■ High-density filling (replacement of air with resin) ■ Strength recovery and durability improvement ■ Reinforcement against rust and suppression of carbonation ■ Construction can be carried out while the facility is in use *For more details, please refer to the PDF document or feel free to contact us.

• Reinforcement and repair materials

"The design and construction method of internal pressure filling joint reinforcement for reinforced concrete structures" is a technical document regarding the evaluation of the IPH system. [Contents] - Technical evaluation results of the Civil Engineering Society's evaluation system for the fiscal year 2010 - Overview of the evaluation target - Evaluation items - Three elements of the IPF internal pressure filling joint reinforcement method - Comparison between general injection methods and the IPF internal pressure filling joint reinforcement method - etc. *For more details, please refer to the technical document.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 H27 Arimine Erosion Control Work Road and Other Works 【Construction Period】 September 1, 2015 – October 31, 2015 【Project Overview】 Repair work for the foundation of the suspension bridge for erosion control dam management 【Project Purpose】 Repair and reinforcement of the suspension bridge foundation *For more details, please download the catalog or contact us directly.

• Renovation and repair methods

This is a technical document comparing the IPH system (internal pressure filling joint reinforcement method) with chipping removal + backfilling (polymer cement mortar) and chipping removal + backfilling (epoxy resin mortar). 【Comparison Contents】 ■Overview Diagram ■Method Overview ■Method Features ■Discussion ■Neutralization and Salt Damage Countermeasures ■Workability of Leak Areas ■Adhesion between Rebar and Concrete ■Economic Efficiency ■Comprehensive Evaluation ■Durability ■30-Year Life Cycle Cost *For more details, please refer to the technical document.

• Renovation and repair methods

"The Long Lifespan of Concrete: 'IPH System'” is a detailed explanatory document about the IPH system (Internal Pressure Filling Joint Reinforcement Method). [Contents] ■ Features of the IPH System ■ Work Procedures ■ Injection Status ■ Characteristics of the Method *For more details, please refer to the technical documentation.

• Renovation and repair methods

The "IPH Method - Method Explanation" is a detailed explanatory document about the IPH system (Internal Pressure Filling Joint Reinforcement Method). [Contents] - Developers of the IPH system and collaborating research institutions - Features of the IPH system - Construction achievements of the IPH system in Aichi Prefecture - Core photos of the IPH system *For more details, please refer to the technical documentation.

• Renovation and repair methods

This is a technical document that thoroughly compares the IPH system (internal pressure filling joint reinforcement method) with other low-pressure resin injection methods. [Comparison Contents] ■Overview Diagram ■Summary ■Target Applications ■Main Objectives ■Pressurization Method ■Pressurization Overview ■Injection Equipment Characteristics ■Injection Material ■Construction, etc. *For more details, please refer to the technical document.

• Renovation and repair methods

This is a technical document explaining the reduction of life cycle costs through the utilization of the IPH system internal pressure filling joint reinforcement method. [Contents] ■ Previous considerations of life cycle costs ■ Preventive maintenance management through asset management of civil structures (bridges, roads, etc.) ■ Utilization of the IPH system internal pressure filling joint reinforcement method *For more details, please refer to the technical document.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 Prefectural Nagoya Airport Runway Repair Project 【Construction Period】 February 29, 2016 – March 23, 2016 【Project Overview】 Concrete pavement repair 【Project Purpose】 Repair of floating sections *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Large Oil Refining Plant 【Construction Period】 January 25, 2016 - February 13, 2016 【Project Overview】 Foundation Columns 【Project Purpose】 Strength Recovery *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (civil engineering). 【Project Name】 Akaiwa Bridge Pier Repair Work 【Construction Period】 March 24, 2016 – March 31, 2016 【Project Overview】 Bridge Repair 【Project Purpose】 Cross-section Restoration *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 FY 2015 Minami-i No. 1 Ishibashi Bridge Repair Work 【Construction Period】 February 6, 2016 – February 26, 2016 【Project Overview】 Bridge repair work 【Project Purpose】 Crack repair, cross-section restoration *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is a case study of the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 Fiscal Year 2015 Bridge No. 2 Miyagawa Bridge Repair Work 【Construction Period】 January 18, 2016 – February 8, 2016 【Project Overview】 Bridge repair work 【Project Purpose】 Crack repair, cross-section restoration (exposed rebar, delamination), internal pressure filling joint reinforcement (floating, bean plate) *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Road Improvement Project (Subsidy) No. 3 【Construction Period】 February 15, 2016 - March 4, 2016 【Project Overview】 Culvert 【Project Purpose】 Crack Repair *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 Emergency Disaster Prevention Erosion Control Work on the First-Class River Nio River 【Construction Period】 December 22, 2015 – March 18, 2016 【Project Overview】 Erosion Control Dam 【Project Purpose】 Integration of Structures *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Bancho Tunnel Crack Repair Project 【Construction Period】 January 28, 2016 – March 24, 2016 *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (internal pressure filling joint reinforcement method) in civil engineering. 【Project Name】 General Prefectural Road Kawachi Hanazaki Line External Road Comprehensive Grant (Disaster Prevention and Bridge Repair) Bunka Bridge External Bridge Collapse Prevention Work 【Construction Period】 June 4, 2015 - June 10, 2015 【Project Overview】 Bridge 【Project Purpose】 Repair Work *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Bridge Reinforcement Work (Toyoko Bridge) 【Construction Period】 October 26, 2015 - March 18, 2016 【Project Overview】 Bridge 【Project Purpose】 Crack Repair *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Takakuma Bridge Superstructure Repair Work 【Construction Period】 April to May 2015 【Project Overview】 Bridge 【Project Purpose】 Repair work *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 Comprehensive Grant for Major Local Road Toyama Kosugi Line Outer Road (Disaster Prevention, Repair, Inspection) Sakaebashi Outer Repair Work 【Construction Period】 October 5, 2015 – March 10, 2016 【Project Overview】 Bridge 【Project Purpose】 Repair *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH construction method (internal pressure filling joint reinforcement method) in civil engineering. 【Project Name】 Repair Work for the Second Kanmon Tunnel on the Town Road Menkawa Line, Fiscal Year 2015 【Construction Period】 September 24, 2015 - October 10, 2015 【Project Overview】 Tunnel repair work: injection of 11.50 m² for cross-section restoration, injection of 8.39 m² for floating sections, injection of 20 m for cracks, and injection of 3.95 m² for significantly floating sections with water leakage. 【Project Purpose】 Repair work for the ceiling area of the tunnel (structure: mortar spray thickness of 10 cm, height approximately 4.8 m, width approximately 5.0 m, length 29.8 m) within a range of 4.6 m. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (Civil Engineering). 【Project Name】 No. 77 Small Kō Port Floating Pier Bearing Reinforcement Work 【Construction Period】 August 20, 2015 – August 22, 2015 【Project Overview】 IPH method 1 set (Chipping 0.9m², Cross-section restoration 0.9m², Resin injection (Drilling depth 10cm, 2 rotations) 61 holes 【Project Purpose】 Reinforcement of the anchor bolts for the ferry pier bearings and repair of the concrete defects in the parapet. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) in civil engineering. 【Project Name】 Replacement of Hardware for Sarukobashi Bridge and Other Works *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

Introduction of IPH Method (Internal Pressure Filling Joint Reinforcement Method) Case Study (Architecture). 【Project Name】 H26 Maintenance Work at Anan Technical High School, Anan and Takarada, Seismic Renovation of the 1st Mechanical and Electronic Building and Others 【Construction Period】 2nd Mechanical and Electronic Building (July 27, 2015 - July 30, 2015) 1st Mechanical and Electronic Building (November 12, 2015 - November 14, 2015) 【Project Overview】 Preliminary Investigation 1.0, Repair of Defective Areas 2.5m², Section Restoration Injection 5.5m² 【Project Purpose】 To reinforce the concrete of the struts and horizontal beams by installing anchor bolts for seismic reinforcement. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (construction). 【Project Name】 Oborozukiyo Retaining Wall Renovation Project 【Construction Period】 August 4, 2015 – August 28, 2015 【Project Overview】 Repair of a building (fence) 【Project Purpose】 Repair of the outer perimeter fence of the annex *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

Introduction of IPH Method (Internal Pressure Filling Joint Reinforcement Method) Case Study (Architecture). 【Project Name】 Shima Kanko Hotel Classic Seismic Renovation and Other Works 【Construction Period】 October 1, 2015 - November 20, 2015 【Project Overview】 Hotel seismic renovation work 【Project Purpose】 Reinforcement of columns and walls, leak prevention measures for cracked areas *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

This is an introduction to the IPH method (Internal Pressure Filling Joint Reinforcement Method) case study (construction). 【Project Name】 Repair Work for the Tsutsumi Bridge 【Construction Period】 October 3, 2015 - October 29, 2015 【Project Overview】 Repair of floating and honeycomb defects in the newly constructed box culvert and water leakage sealing. 【Project Purpose】 Repair of areas with poor concrete quality. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

The "IPH System (Internal Pressure Filling Joint Reinforcement Method)" is one of the automatic low-pressure resin injection methods widely used for the restoration of concrete structures damaged by earthquakes and for the repair and renovation of existing structures. By drilling a hole for the injector installation and injecting high-flow resin at low pressure from within the concrete, it is possible to achieve high-precision filling, akin to ensuring that moisture and nutrients reach all the veins of a plant's leaves. By diffusing the resin into a spherical shape, the injection density around the rebar increases, providing a rust prevention enhancement effect. 【Features】 - The epoxy resin for injection is highly fluid, allowing for more natural injection by utilizing capillary action. - Injection and filling into fine cracks within the structure can be achieved for widths down to 0.01 mm. - The filling effect at the ends of fine cracks improves the durability of the components beyond the design strength at the time of new construction. - Due to the filling effect in fine areas, it is expected to be effective not only for structures but also as a waterproofing method for buildings. - The components of the cement paste designed to prevent resin leakage penetrate reliably to the internal rebar. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

The IPH method (internal pressure filling joint reinforcement) replaces the air present inside the concrete with injected resin, allowing it to fill even the fine cracks at the ends by diffusing radially from the inside of the drilled holes. This method not only enhances the adhesion strength of reinforced concrete but also provides a high anti-corrosion effect, leading to improved durability. It has received technical evaluation from the Japan Society of Civil Engineers and has obtained a patent for the method. 【Catalog Contents】 ■ IPH Method ■ What is the IPH Method ■ Features ■ Construction Procedure ■ Performance Recovery Experiment of Column Specimens ■ Papers on the IPH Method ■ Various Case Studies *For more details, please refer to the technical catalog.

• Renovation and repair methods