There are no restrictions on the penetration direction, and in-situ tests can be conducted on the tunnel wall surface.
We handle the air pressure pin penetration testing machine 'APP Tester', which drives a dedicated pin into concrete using air pressure, measures the penetration depth, and estimates concrete strength. This is a simple testing method that replaces the pull-out testing machine used for initial strength testing of sprayed concrete, requiring no test specimens and allowing for in-situ testing of the concrete sprayed on wall surfaces. 【Features】 - Easy to handle with no individual differences in test results - Stable penetration force obtained through air pressure - Allows for a wide range of strength estimation by using two types of pins with different penetration resistances (Pin A: 10–30 N/mm², Pin B: up to 10 N/mm²) *For more details, please download the PDF or feel free to contact us.
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【Main Achievements】 ■ Construction of the Shizuoka No. 6 Tunnel on the Second Tomei Expressway ■ Construction of the Hida Tunnel Escape Shaft on the Tokai-Hokuriku Expressway ■ Repair work on the Tsuruga Tunnel on the Hokuriku Expressway, among others *For more details, please download the PDF or feel free to contact us.
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For more details, please download the PDF or feel free to contact us.
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The work of Nippon Marts Co., Ltd. is to support customers by providing machinery for their on-site needs. However, regardless of how thoroughly we prepare, malfunctions and defects in machinery can occur. This is why our responsiveness is what customers choose us for. We will respond to various situations with determination and a spirit of challenge, never backing down from any unreasonable demands.