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DEXTRA
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DEXTRA
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Meu Dextra

Túneis e Mineração

Tunelamento and Mining

Aplicações Típicas

Soft-eye PRFV wall for easy penetration of TBM through retaining walls.

Para fixação em telhados e paredes em aplicações temporárias e permanentes

Nossas soluções

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Innovative PRFV solution for efficient tunnel excavation ASTEC™ PRFV combination bolt is a unique and innovative Glass Fiber Reinforced Polymer solution precisely designed by Dextra. In unconsolidated excavation areas, like steel bolts, PRFV Combination Bolts can be automatically installed by a jumbo machine or manually installed. Thanks to the characteristics of the PRFV material, Combination Bolt can easily be cut by common excavation equipment, which makes the product an ideal solution for temporary application for tunnel excavation projects. Eurocode 2, BS 8110, DIN 1045, ACI 318, IBC, AASHTO, ASME Sec III Div 2.
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Tunnel breakthrough made easy with PRFV rebar ASTEC Soft–Eyes allow the penetration of Tunnel Boring Machines (TBM) through paredes de diafragma and secant piles. This unique technology uses cuttable Glass Fiber Reinforced Polymer (PRFV) reforço as an advantageous replacement for conventional steel rebars. The Soft-Eye technology was developed by Dextra in 1996 and successfully implemented for the first time on Bangkok MRT subway stations. The Soft-Eye technology has since become a standard concept in the design of launching/receiving shafts and subway stations. We have successfully supplied over 500 soft-eyes on all continents. Dextra offers an integrated turnkey solution that includes design, optimization, manufacturing, logistics, and on-site training.
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Os sistemas de vigas treliçadas GEOTEC são estruturas de aço curvas tridimensionais leves que são compostas por barras principais, barras secundárias, placas de conexão, placas de apoio e reforços.

The lattice girder can provide immediate support for tunneling ambientes.

O raio de curvatura é feito sob medida para atender às demandas de cada projeto.

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Tubo de guarda-chuva

Um sistema de pré-apoio para motivos fracos

O sistema de tubo guarda-chuva GEOTEC™ é um pré-suporte em condições de solo macio e fraco. O sistema compreende tubos de aço instalados a partir da face do túnel para formar uma cobertura para estabilizar o rumo do túnel. Distribuir a carga na direção longitudinal pode diminuir a deformação durante as escavações.
O mecanismo de suporte do método do tubo guarda-chuva é estabilizar a face da escavação nas direções transversal e longitudinal por meio de uma zona reforçada em forma de arco. O sistema de apoio pode ser dividido em três aspectos diferentes:
Suporte radial Suporte longitudinal
Subdivisão de áreas abertas da zona não apoiada

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Parafuso Combinado de Aço

Immediate and permanent rock bolting solution GEOTEC™ steel combination bolt is suitable for the most stringent requirements. A mechanical bolt combined with a corrugated pipe and a double grout layer all along the tendon to provide both high bonding and protection against corrosion (similar to Double Corrosion Protection / DCP). It is initially installed for immediate support by the use of an expansion shell, to be fully grouted at a later stage allowing it to be classified as permanent application. bent reforço bars while being simpler and faster to install.
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Cuttable mining anchor GEOTEC™ PRFV solid rock bolt is a rock-bolting system based on a fully threaded PRFV tendon. It is specially designed for the following applications: Face-bolting and temporary applications: The cutability of PRFV makes it the ideal solution for face bolting or any other tunneling/mining application where further excavation is required. Cohesive soil & hard rock. GEOTEC PRFV is installed into pre-drilled holes. Installation with grout or with resin cartridges.
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Perfuração, rejuntamento e ancoragem em um só lugar!

GEOTEC Steel self-drilling rock bolt is a rock-bolting system based on a fully coarse threaded hollow bar.
É especialmente recomendado para as seguintes aplicações:
Fixação de telhado e parede.
All ground conditions. GEOTEC self drilling rock bolts do not require pre-drilling a hole, therefore making it usable even in soft rock conditions.
Installation with grout. The hollow steel anchor rod also acts as a grouting pipe to ease setup. For non-grouting applications, please refer to the mechanical anchor or expandable friction bolt.
Aplicações temporárias ou permanentes. Com revestimento epóxi opcional disponível para aplicações permanentes.

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PRFV hollow rock bolt

ASTEC PRFV hollow rock bolt is a rock-bolting system based on fully threaded hollow PRFV bars. It is specially designed for the following applications:

Aparafusamento frontal e aplicações temporárias: The cut-ability of PRFV makes it the ideal solution for face bolting or any other tunneling/mining application where further excavation is required.

Cohesive soil & hard rock conditions: ASTEC is inserted into a pre-drilled hole. For a non-cohesive soil environment, refer instead to PRFV Self-Drilling Bolts.

Instalação com argamassa: The hollow PRFV anchor rod also acts as a grouting pipe to ease installation.

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