Xinyu RECORD Technology Co., Ltd.
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LF 401 is a spraying film which used for waterproofing to concrete structures. It is mainly used for spraying construction between shotcrete or cast-in-place concrete to make a "sandwich". It has good bond strength and elasticity between the two concrete. As a bonding entity, it provides excellent waterproofing properties for underground structures to prevent water ingress. LF 401 will get hardened within 4 to 6 hours (depending on environmental conditions) after spraying off, providing sufficient time for concrete lining and effectively ensuring construction progress. Similar to other shotcrete products, it can not prevent water penetration through the concrete. For such cases, it will be better to start spraying after water drainage. (Please refer to the LF 401 technical description. However, the LF 401 can be used in humid working (Non flowing water) surfaces. LF401 is also suitable for steel fiber shotcrete structures.)
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Xinyu RECORD Technology Co., Ltd.
LG 131 is a two-component solvent-free resin foam suitable for rapid filling of cavities in coal mine tunnel and rock face, water proofing and prevention of air leakage.
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Xinyu RECORD Technology Co., Ltd.
LC 241 is a two-component injection foam used for cavity filling, to isolate air and mash-gas intervention.
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Xinyu RECORD Technology Co., Ltd.
LG 131 is a solvent-free silicate modified polyurethane resin made of two-component which use for grouting and rapid treatment of fractured coal mine layer and rock fault.
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Xinyu RECORD Technology Co., Ltd.
LG 134 is polyurethane material made of two-component, which use for ground reinforcement and small water ingress. It has high level adhesive force and excellent mechanical properties. It can last the same long lifetime when bonding and united with the ground condition; The reaction speed of the product can be improved by adding a certain amount of accelerator. After injection into the ground, the low-viscosity mixture remains as liquid status for a few seconds, penetrates into cracks, expands, and effectively strengthens and seals the broken area.
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Shotcrete uses compressed air to transport concrete mixture in a certain proportion through pipelines and spray it onto the sprayed surface at high speed to solidify and harden, thereby forming a concrete supporting layer. In recent years, shotcrete technology has been widely used in construction, railway and highway tunnel construction, mine tunnel construction, slope reinforcement and other fields with its simple process, unique effects, economical cost and fast construction speed.
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What are the four stages in the development history of shield tunnels at home and abroad?
Since Brunel's square shield, shield technology has been improved for 23 years. By 1869, Great was responsible for the construction of the second tunnel across the Thames. From the repeated failures of Torevix at the beginning, to Brunel's shield construction method , and then improved into Great's shield construction method, which lasted for 80 years.
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