News Archives

Dextra to attend WTC 2020 virtual exhibition

发表于 8 月 1, 20202 月 6, 2024 通过 Sir Gwi

Click here for more information and registration

Dextra is showcasing innovative ground engineering solutions, featuring GFRP 软眼 和 Rock-Bolts, at the World Tunnel Digital Congress (WTC) 2020 on September 14-16, 2020.

WTC is one of the world’s leading tunneling event that explores the latest innovations, trends and advances in all areas of tunneling, from tunnel project development to both design and construction.

The event is moved to a fully digital platform due to the impact of COVID-19: it will include online technical paper presentations, along with training courses, and virtual exhibitions by companies from all over the world.

Dextra features a wide range of underground temporary and permanent support solutions, with a focus on cuttable glass fiber reinforcement polymer (GFRP) technology: join us at the virtual exhibition at booth no. SS11 (Silver Sponsor)!

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Dextra GFRP rebar technology featured in SAICE magazine

发表于 7 月 1, 20202 月 6, 2024 通过 Sir Gwi

Dextra GFRP rebar technology is featured in the April 2020 issue of the SAICE Civil Engineering magazine.

The article provides guidance on the design of lateral support systems using FRP rebars as soil nails or ground anchors.

Fiber-reinforced polymers are increasingly used in mining and tunneling projects as they provide high performance while being easily cuttable, corrosion-free and lighter in weight with respect to steel rebars.

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Read the full issue

For more information on Dextra GFRP rebars

用于拉杆的新 CAD/BIM 工具！

发表于 6 月 1, 20202 月 6, 2024 通过 Sir Gwi

拉杆的新 CAD/BIM 组件可用于 AutoCAD、Revit 和 Tekla。

Dextra 拉杆是适用于屋顶、外墙、桥梁和高架桥的高性能解决方案。它们可用作支撑或悬挂元件，设计美观且功能强大。

这些 CAD/BIM 工具允许设计人员通过将提供的组件导入到所选软件中来快速准确地对建筑结构进行建模和详细设计。

立即下载组件并利用我们易于使用的 AutoCAD、Revit 和 Tekla 组件（提供所有尺寸和等级）。

Tension Rod Tools

如何开始？

1.下载并安装拉杆组件：

• 对于 AutoCAD 用户，请下载这里（需要注册）

• 对于Revit 用户，请下载这里（需要注册）

• 对于 Tekla 用户，请下载这里（需要注册）

2. 将文件解压到笔记本电脑上所需的文件夹中。

3. 按照名为“readme.pdf”的文件中详细说明的分步说明进行操作

4. 根据您的项目要求选择合适的杆尺寸。画出完整的结构。

5. 您最终可以直接在 AutoCAD、Revit 和 Tekla 上添加产品规格说明。

Dextra 张力杆工具：教程视频

Dextra Group announces partnership with Rocscience

发表于 5 月 1, 20202 月 6, 2024 通过 Sir Gwi

Rocscience Partnership

We are excited to announce that a wide range of Dextra ground engineering solutions is now available in the Rocscience programs Slide2, Slide3, RS2 和 RS3.

Rocscience is a world leader in developing 2D and 3D software for civil, mining, and geotechnical engineers. For over 20 years, they have built on leading-edge research to create the best geotechnical software available.

Users will be able to select Dextra products from a built-in list and integrate them directly into their design.

The Dextra products that are available in the Rocscience suite include:

• ASTEC Active Anchor TB3

• ASTEC Combination Bolt

• ASTEC GFRP Injected Thread Rockbolt

• ASTEC GFRP Thrust Bolt

• ASTEC Soil Nail Grade 50

• GEOTEC GFRP Rockbolt

• GEOTEC GFRP Self Drilling Rockbolt

Dextra ground engineering solutions are high performance and versatile. Due to their cuttability, the bolts can be used for the stabilization of soil-covered slopes, face bolting and other tunneling/mining works in both temporary and permanent applications.

Learn more about Dextra soil stabilization solutions

Learn more about Dextra tunneling and mining solutions

Dextra China certified ISO 14001:2015

发表于 5 月 1, 20202 月 6, 2024 通过 Sir Gwi

Dextra China ISO 14001:2015

We are delighted to share with you our ISO 14001:2015 (environmental management system) certificate awarded by the Bureau Veritas Certification.

It is to certify that the management system of Dextra China has been audited and found to be in accordance with the requirements of the management system standards, in the scope of design, manufacturing and sales of products.

With the update of our ISO 9001 certification in 2018, this new environmental certification completes a solid quality system in the Guangzhou office.

Dextra has been consistent in creating a green and environmentally sustainable manufacturing system.

We have been improving our quality management system and raising environment awareness in our daily operations.

Contact Dextra in China

Coupler performance tests at elevated temperatures

发表于 4 月 1, 20202 月 6, 2024 通过 Sir Gwi

The Imperial College London tested Dextra Bartec/Fortec and Griptec couplers at elevated temperatures to evaluate how the couplers would perform in case of a fire.

测试的亮点包括：

The findings indicate that current codified rules can be used for assessing the strength and stiffness properties of both non-spliced rebar and rebar connected with Bartec/Fortec or Griptec couplers.

At temperatures below 400°C the ultimate tensile strength and stiffness of Bartec/Fortec and Griptec splices, as well as un-spliced rebar is not significantly affected.

When tensile tested at temperatures below 500°C, failure still generally occurred in the rebar outside of the Bartec/Fortec or Griptec coupler region.

请阅读下面的全文：

Dextra Bartec/Fortec and Griptec rebar couplers at elevated temperatures

Dextra have recently collaborated with Imperial College London to investigate the performance of rebar couplers at elevated temperatures, simulating temperatures which could occur in rebar due to fire, both before and after concrete spalling.

Standard 16mm and 20mm Bartec/Fortec and Griptec couplers were used, as well as non-spliced reinforcement and tests conducted at ambient, elevated steady state and transient elevated temperatures.

testing machine

schematic representation of the testing arrangement

a) testing machine, b) schematic representation of the testing arrangement

Codified procedures for the fire design of reinforced concrete structures typically give prescriptive recommendations for rebar/coupler cover with the aim of protecting the reinforcement from reaching temperatures above a critical value of around 500°C.

The test results show that:

For both spliced and un-spliced specimens there is a gradual decrease in yield strength as temperature increases.

At temperatures below 400°C the ultimate tensile strength and stiffness of the spliced and un-spliced specimens is not significantly affected.

When tensile tested at temperatures below 500°C, failure still generally occurred in the rebar outside of the coupler region.

The findings also indicate that current codified rules can be used for assessing the strength and stiffness properties of both non-spliced rebar and rebar connected with Bartec/Fortec or Griptec couplers.

However, the code assumptions regarding the ultimate strain characteristics at elevated temperatures were found to be unrealistic for hot rolled rebar, as well as rebar connected by couplers.

需要有关我们耦合器的更多信息？

了解我们的耦合器系列

参考

Bompa, D. V., & Elghazouli, A. Y. (2019). Elevated temperature characteristics of steel reinforcement incorporating threaded mechanical couplers. Fire Safety Journal, 104, 8–21. https://doi.org/10.1016/j.firesaf.2018.12.006

New CAD/BIM tools for Unitec bolted couplers!

发表于 4 月 1, 20202 月 6, 2024 通过 Sir Gwi

New CAD/BIM components of Unitec couplers are now available for AutoCAD, Revit and Tekla.

Unitec® is a bolted splicing system used in repair works for the connection of two rebars which haven’t been previously prepared (that is, no threads).

Unitec coupler features a long hollow body which will bond with the rebar. Several screws will lock both bar ends and complete the connection.

You can download the components now for free!

Dextra Unitec couplers on Revit

如何开始？

1. Download and install Unitec coupler component:

• 对于 AutoCAD 用户，请下载这里（需要注册）

• 对于Revit 用户，请下载这里（需要注册）

• 对于 Tekla 用户，请下载这里（需要注册）

2. 将文件解压到笔记本电脑上所需的文件夹中。

3. 按照名为“readme.pdf”的文件中详细说明的分步说明进行操作

4. 根据您的项目要求选择正确的耦合器尺寸。画出完整的结构。

5. 您最终可以直接在 AutoCAD、Revit 和 Tekla 上添加产品规格说明。

COVID-19 preventive measures

发表于 4 月 1, 20202 月 6, 2024 通过 Sir Gwi

The safety and security of our employees, customers, and other stakeholders are our top priorities.

Dextra Group has implemented measures based on guidance received from local authorities in order to help prevent the spread of COVID-19 infections.

These measures include:

– Either normal work, alternate work or work from home according to the local health authorities’ recommendations.

– For all employees in our offices or factories, strict social distancing and strict limitation of visitors allowed in Dextra’s premises.

– Reduction of meetings and contact with third parties to the bare minimum.

– Extensive access to sanitizing and protection products.

– Deep cleaning and fumigation of facilities whenever applicable.

– Cancellation of all travels, domestic and international.

For the time being, each Dextra affiliate will keep enforcing and updating its preventive measures according to the local regulations.

Despite the critical situation worldwide, Dextra team is committed more than ever to provide the best service possible to its customers while guaranteeing the safety of all parties involved.

Our factory in India, which serves only the local market, is complying with the complete lockdown imposed by the Indian government. Our main factories, in Thailand and China, are currently fully operational and delivering goods and services as usual. Their supply chains are not hampered by the current restrictions.

Please follow the indications of the World Health Organization and local governmental health agencies in order to prevent unnecessary risks, minimize the spreading of the virus and be safe.