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DEXTRA
リンクトイン フェイスブック ユーチューブ
DEXTRA
リンクトイン フェイスブック ユーチューブ
私のデクストラ

トンネルと採掘

トンネリング and Mining

代表的なアプリケーション

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

一時的および恒久的な用途での屋根と壁のボルト締め用

当社のソリューション

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Innovative FRP solution for efficient tunnel excavation ASTEC™ FRP combination bolt is a unique and innovative Glass Fiber Reinforced Polymer solution precisely designed by Dextra. In unconsolidated excavation areas, like steel bolts, FRP Combination Bolts can be automatically installed by a jumbo machine or manually installed. Thanks to the characteristics of the FRP 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 FRP rebar ASTEC Soft–Eyes allow the penetration of Tunnel Boring Machines (TBM) through 地中隔壁 and secant piles. This unique technology uses cuttable Glass Fiber Reinforced Polymer (GFRP) reinforcement 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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GEOTEC格子桁システムは、主筋、副筋、連結板、踏板、補剛材で構成される軽量の三次元曲面鋼フレームです。

The lattice girder can provide immediate support for tunneling 環境。

曲げ半径は、各プロジェクトの要求に合わせてカスタマイズされます。

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傘パイプ

弱い地盤に対する事前サポート体制

GEOTEC™ アンブレラ パイプ システムは、軟弱な地盤条件における事前サポートです。このシステムは、トンネル切羽から設置された鋼管で構成され、トンネルの頭首を安定させる屋根を形成します。長手方向に荷重を分散させることで掘削時の変形を軽減します。
アンブレラパイプ工法の支持機構は、アーチ状の補強ゾーンにより掘削切羽を横方向と縦方向の両方向に安定させるものである。サポート システムは 3 つの異なる側面に分けることができます。
ラジアルサポート 縦サポート
サポートされていないゾーンのオープンエリアの細分化

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スチールコンビネーションボルト

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 reinforcement bars while being simpler and faster to install.
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Cuttable mining anchor GEOTEC™ FRP solid rock bolt is a rock-bolting system based on a fully threaded GFRP tendon. It is specially designed for the following applications: Face-bolting and temporary applications: The cutability of FRP makes it the ideal solution for face bolting or any other tunneling/mining application where further excavation is required. Cohesive soil & hard rock. GEOTEC FRP is installed into pre-drilled holes. Installation with grout or with resin cartridges.
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穴あけ、グラウト注入、アンカー固定が 1 つで行えます。

GEOTEC Steel self-drilling rock bolt is a rock-bolting system based on a fully coarse threaded hollow bar.
以下の用途に特にお勧めします。
屋根と壁のボルト固定。
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.
一時的または永続的なアプリケーション。オプションのエポキシコーティングにより、恒久的な用途に使用できます。

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FRP hollow rock bolt

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

フェースボルト締めおよび一時的な用途: The cut-ability of FRP 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 FRP Self-Drilling Bolts.

グラウトを使用した設置: The hollow GFRP anchor rod also acts as a grouting pipe to ease installation.

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