Construction is possible only in the work zone on the road without excavation! A new pipeline is formed inside the existing pipe.
The "Danby Method" is a technique for rehabilitating damaged or aging pipes in sewers, agricultural water systems, and sluice gates without excavation. A rigid PVC strip is fed into the existing pipe from a manhole, and while spirally winding it along the inner surface of the pipe, adjacent strips are joined using a fitting component to form a continuous pipe body. After that, using a spacer for injecting filler material, which is pre-installed above the existing pipe, the filler material is injected into the gap between the strip pipe and the existing pipe, resulting in a composite pipe that is integrated with the existing pipe, exhibiting high strength and water tightness. 【Features】 - Construction is possible only in the work zone on the road without excavation. - A new pipeline is formed on the inner surface of the existing pipe. - Improved chemical resistance and abrasion resistance due to the formation of a rigid PVC pipeline. - Enhanced load capacity, seismic resistance, and flow capacity as a composite pipe integrated with the existing pipe. *For more details, please download the PDF or feel free to contact us.*
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【Merits】 ■ Since it is non-excavation, it can minimize the impact on the surrounding environment. ■ By utilizing existing pipes, it can reduce costs and eliminate waste generation. ■ Improved chemical resistance and abrasion resistance increase the durability after rehabilitation. ■ It has load-bearing capacity equal to or greater than that of existing pipes, and the flow capacity is enhanced by improving the roughness coefficient, while the use of flexible joint components improves seismic resistance. *For more details, please download the PDF or feel free to contact us.
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Kouwa Commercial Co., Ltd. was established in October 1975 by separating the sales division of Hirokuchi Block Co., Ltd., a comprehensive manufacturer of concrete products, and has since developed into a general trading company dealing in concrete secondary products, steel materials, civil engineering and construction materials, reaching this milestone after 50 years. During this time, in response to the diverse society alongside economic development, we have earnestly committed ourselves to the advancement of our business, upholding sincerity and trust as our principles. As a result, thanks to the support of many related industries, we have been able to build a solid foundation of trust. We sincerely appreciate and thank our clients and all those in related industries for their support and guidance. All of us at the company, as we welcome the 21st century, are eager to continue advancing businesses that meet the needs of the local community and fulfill our mission. We kindly ask for your continued guidance and support, and we extend our greetings.