ロンドン クロスレール (2016 年にエリザベス線と命名) は、ヨーロッパ最大のエンジニアリング プロジェクトです。これはロンドン交通局の投資プログラムの主要部分であり、交通システムへの過去 50 年間で最大の追加工事です。

このプロジェクトは、西のレディングとヒースロー空港から東のシェンフィールドとアビーウッドまでを結ぶ、グレーターロンドンを横断する118キロメートルの東西鉄道で構成されています。

2009 年以来、Dextra は、次のようなステーションを含む 20 以上のパッケージで 600,000 を超えるグリップテック接続を提供してきました。

• リバプール・ストリート
• パディントン
• ボンドストリート
• カナリーワーフ
• ロイヤル オーク ポータル
• プリンミルレーン

グリップテック カプラーは、D ウォール (垂直および水平接続)、柱および杭 (垂直接続) に使用されています。

クロスレールの各セグメントは段階的に運用を開始し、完全完成は 2019 年 12 月に予定されています。

リオデジャネイロ 4 号線は地下鉄です。一部は高架、一部は地下です (2 つのセグメント)。この路線は、2016 年のリオデジャネイロ夏季オリンピックに合わせて開通する予定です。

Dextra は、2013 年から 2015 年にかけて、駅の出入口ポイント用の 4 つの大型 FRP ソフト アイの設計、エンジニアリング、供給に携わってきました。これらのソフトアイは、南アメリカ大陸に初めて納入されたものでした。

D-Wall の建設に先立って、Dextra は TBM のサイズ、誤差の範囲、土の力、その他の設計パラメーターを考慮して FRP ケージの設計を設計します。

FRP 材料の特性のおかげで、トンネル ボーリング マシンは最小限の時間で D ウォールを切断し、予定どおりの時間を節約し、TBM ヘッドの完璧な状態を保証します。リオのような湿気の多い環境では、ステーション掘削部への水の侵入を制限するために、時間要因が特に重要です。

このプロジェクトでは、Dextra は、ケージを再接続するための垂直コネクタとしてステーションのダイヤフラム壁の垂直接続として使用される Rolltec 鉄筋カプラーも提供しました。

カプラーは、D ウォール内のスラブ (駅レベルおよび表面) に再接続ポイントを提供するために水平方向にも使用されました。

The Doha Metro is a rapid transportation system, designed as an integral component to the larger Qatar rail network. This country wide mega-scale infrastructural project consists of 300km of rail and 100 stations. The rail network to reduce traffic congestion, and to connect the people of Qatar with the rest of the GCC region. At the city scale, currently under construction, the metro is projected to be operational by the end of 2019. It will serve Doha and its surrounding suburbs with stations located in all major nodes of the metropolis. Doha Metro will be operating both at grade and below grade, with the majority of the metro project being underground. Complex tunneling and soil retaining solutions by Dextra were utilized in the construction of this project.

Glass Fiber Reinforced Polymers (GFRP) as Tie-back anchors to retain soil

To eliminate concerns of encroachment, and obstacle for future construction projects, the Diaphragm Wall (D-Wall) at Al Sadd C-Ring Station were post-tensioned anchored with ASTEC Active Active Anchor. These high performance, fully cut-able GFRP anchors were chosen by ALSYJ JV contractors and the D-Wall anchors of choice. This innovative solution was chosen because it can be cut by Tunnel Boring Machines (TBM) or standard excavation equipment, it also doesn’t need to be removed from the ground even in temporary applications. For Al Sadd C-Ring Station 7,113 strands for GFRP rebars were used to make approximately 700 ground retaining anchors used in the D-WALL around that station.

The Second Ho Chi Minh City Environmental Sanitation Project consists of the construction of interceptor that will convey the wastewater collected from the Nhiêu Lộc-Thị Nghè Canal and District 2 areas of Ho Chi Minh City to the treatment plant.

Dextra has been involved in the construction of the large underground system by supplying 40 Soft-Eyes to assist in the tunnel breakthroughs.

The cuttable Glass Fiber Reinforced Polymer (GFRP) Soft-Eyes were applied to reinforce 21 shafts, allowing the penetration by the Tunnel Boring Machine (TBM) without the need of removing steel reinforcement and without the risk to damage the TBM’s head.

With its completion, planned to be in 2022, the wastewater services in HCMC will have a considerably more sustainable nature, and will be remembered as the first big step toward the alleviation of the environmental and sanitation issues of the Country.

Nagpur, the second capital of Maharashtra and one of the fastest developing city in India is witnessing major growth in terms of Infrastructure. The development encompasses primarily the connectivity, of which Metro rail becomes a major part.

Incepted in 2016, the metro project is being a subject of acclaimed discussion for its speed of execution and the quality of construction.

Within the city boundaries, it requires the highest standards of safety considerations including the seismic analysis of structure in service life.

Project Requirement

The fast track project has typical structure for its Line 1 alignment, where the viaducts are supporting 2 levels of pathways, lower one for NH-7 and upper one for the metro rail. As the impact loading is a big concern due to train movement.
Being the stretch of always busy traffic, a solution was required which does not have to revise the existing design. Plus a major concern was the impact on speed of the otherwise fast moving project. The issue was concerning to all the stakeholders especially the GC for the project, who were looking to maintain the agility as well as find a sustainable solution.

Solution

Dextra Introduced Shear Key Bars for the priority section allowing the structure to neutralize the seismic forces. This not only helped the contractor to get the work done faster, but also enabled the client to go for the trial run earlier than expected.

Doha Metro Phase 1 is Qatar’s mega infrastructure project of three metro lines with a total length of 164 km. The first phase involves the construction of red, green and gold lines and their major stations. It is a part of a US$36,000 million Doha Metro Rail Network Project, aiming to reduce the city’s road traffic congestion while facilitating the connection between Qatar and other Gulf countries.

The required completion period of this project is extremely short: with excavation starting in mid-2013 and operations expected by 2019. With the timeline of the project being constrained, high innovative solutions are required to complete the building of underground structures in a minimal amount of time.

Dextra’s FRP Active Anchors as temporary tie-backs in retaining walls

Composite materials have been used for over 20 years as temporary reinforcement in concrete structures. In Doha metro phase 1, both Dextra’s post-tensions carbon-FRP (CFRP) Active Anchors and glass-FRP (GFRP) Active Anchors have been used in retaining walls. When used as temporary tie-backs, CFRP material is offering the most advanced technical solution thanks to its superior properties in tensile, creep and durability, while the GFRP Anchors offers a cost-effective solution without technical compromise.

GFRP anchors can advantageously replace steel removable anchors to prevent encroachment of neighboring plots. This is why nowadays, GFRP anchors account for more than 90% of the FRP anchors installed in the region.

For the first phase of the Doha Metro Rail Network project, Dextra has been supplying 150 CFRP Active Anchors and 700 GFRP Active Anchors to date.

ASTEC Soft-Eye for a better penetration of TBMs

Dextra’s ASTEC Soft-Eyes is a unique technology using cut-able GFRP reinforcement as a replacement of conventional steel rebars. Since 1996, this solution has become a standard concept in the design of shafts and subway stations. More than 10 sets of Dextra’s ASTEC Soft-Eyes have been supplied and used in Doha Metro construction project as per May 2018.

To reduce traffic congestion on Mexico – Toluca highway, as well as to ease connections between both cities, the Secreatariat of Commuciations and Transportaion (SCT) is undergoing the construction of the new Mexico city areas’ 55.7-kilometer rail line. Aiming to be an environment-friendly project, the commuter rail line includes 4.7-kilometer double-tube tunnel in highly complex terrain and natural protected areas.

The new train will connect Toluca Valley to Mexico City, and will provide a service to an estimated 270,000 commuters. The line included 6 stations: 2 terminals (Zinacantepec and Observatorio) and 4 intermediate (Cristobal Colon, Metepec, Lerma, and Santa Fe). It will also be a backbone for Mexico City area’s regional and urban transport.

The construction being initiated in 2015, the railway is scheduled for completion in 2019.

Light and productive rebar coupler solution for the construction project

For the reinforcement of the railways concrete structures, Dextra supplied more than 100,000 Rolltec splices. The system is a practical and economic alternative to laps. Rolltec is also supported by one rebar preparation equipment, and only one man is needed to operate the machine.

Plus, thanks to the performance of our machines, the thread is ready in less than 30 seconds!
Moreover, with Rolltec system, the same type of coupler can be used for both standard and position applications, resulting in an optimized inventory of the project.

For more information about our projects in Latin America, contact our Panama Office.