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  6. Tunnel Backfill Repair Method Using Urethane Injection "Tn-p Method"

Tunnel Backfill Repair Method Using Urethane Injection "Tn-p Method"

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last updated:Apr 21, 2025

アキレス 化成品事業部フイルム販売部
アキレス 化成品事業部フイルム販売部
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Cost reduction with 40 times high foaming polyurethane! Improved workability with compact injection equipment!

The "Tn-p Method," which is a "NETIS Utilization Promotion Technology (Old Registration)," is a tunnel repair technique that involves injecting polyurethane foam into the void behind the tunnel lining for repairs. It is effective in preventing sudden collapse accidents of the ground behind the tunnel lining. With 40 times the expansion of conventional polyurethane, it is economical, and the injection equipment is compact and easy to work with. Additionally, it is lightweight, which reduces the load on the tunnel, and it solidifies in just a few minutes, thereby reducing the risk of accidents caused by material leakage from cracks. 【Features】 - The injection equipment is compact, and the injection material comes in drum cans, allowing everything to be loaded onto a single 4-ton truck. - Ultra-lightweight, reducing the load on the tunnel lining. - Rapid solidification reduces the risk of accidents due to material leakage. - Environmentally friendly, using no fluorocarbons in the foaming agent. ★ To promote the widespread adoption of this method, we have established the "Polyurethane Void Injection Association." For more details, please visit the official website at the URL below. https://tnp-method.com/ *You can immediately view the details of the method from the "Catalog Download."

    Bridge ConstructionTunnel constructionRenovation and repair methods
1805_achilles_tn-p.jpg

Tunnel Backfill Repair Method Using Urethane Injection "Tn-p Method"

1805_achilles_tn-p.jpg
1805_achilles_tn-p.jpg
  • Related Link - http://www.achilles.jp/product/construction/civil/…

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【Material Properties of Tn-p Method】 Original Liquid Name: SK-02 Foaming Ratio: 40 times Form Density: 30±3kg/m3 Compressive Strength: 0.14N/mm2 or more Cream Time: 14±5 seconds Gel Time: 60±10 seconds Combustibility: Passes JIS A9521 *In addition to the above, there are types with 7 times, 8 times, 12 times, 20 times, and 30 times foaming. 《Also Recommended!》 【EPS Method】 ◎ Constructs embankments by stacking large blocks of expanded polystyrene ◎ Density is about 1/100 that of soil or concrete, making it ultra-lightweight ◎ Rapid construction is possible over large areas ◎ Its self-supporting nature is effective in reducing soil pressure ◎ Manual construction reduces noise 【Juten Bag】 ◎ Suitable for repair and reinforcement work of various cavities such as waterfronts, rivers, lakes, and bridges ◎ Thickness is 0.2mm, allowing it to be folded and used, and can be inserted through small injection holes with a diameter of 10 to 20 cm ◎ Durable and resistant to damage, preventing the outflow of filling materials ◎ Eliminates the need for large machinery, improving safety ◎ Can be manufactured to match the size and shape of cavities *For more details, please download the catalog or contact us.

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【Number of Achievements of Tn-p Method】 (As of the end of March 2024) Ministry of Land, Infrastructure, Transport and Tourism Directly Managed Projects: 57 cases Public Works: 421 cases Private Works: 15 cases In addition to road tunnels, it can also be applied to railway and waterway tunnels, utilizing its characteristics of lightweight, compact equipment, and early solidification for various filling works, such as injection filling into voids behind retaining walls, bridge abutments, and liner plates. *For more details, please refer to the catalog or feel free to contact us.*

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Tunnel Backfill Repair Method Using Urethane Injection "Tn-p Method"

Tunnel Backfill Repair Method Using Urethane Injection "Tn-p Method"

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アキレス

アキレス 化成品事業部フイルム販売部

Building materials, supplies and fixtures manufacturers

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Achilles, with plastic processing technology as its core technology, delivers a wide variety of products that support daily life and industry, ranging from everyday consumer goods to advanced electronics components, to the world.

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