राष्ट्रीय राजमार्ग 44 (एनएच 44) भारत का सबसे लंबा राजमार्ग है, जो श्रीनगर से कन्याकुमारी तक 3,745 किमी तक फैला है।

जैसे-जैसे समय आगे बढ़ा, राजमार्ग के निकट के शहरों का विस्तार इतनी तेजी से हुआ कि राजमार्ग से सटे इलाकों में बहुत बड़ी संख्या में वृद्धि हुई।

परिणामस्वरूप, सड़क के दोनों किनारों पर पैदल चलने वालों और हल्के वाहनों के कारण अक्सर लंबे मार्ग के भारी वाहनों का प्रवाह और गति प्रभावित होती है। यह उन स्थानीय हल्के वाहनों और पैदल यात्रियों के लिए भी एक बड़ा खतरा है।

इस समस्या को हल करने के लिए, भारतीय राजमार्ग प्राधिकरण ने सड़क चौड़ीकरण के साथ-साथ उस हिस्से पर फ्लाईओवर बनाने का प्रस्ताव रखा, जहां राजमार्ग घनी आबादी वाले कस्बों से होकर गुजर रहा है।

नागपुर-हैदराबाद क्षेत्र में राजमार्ग का 34 किलोमीटर लंबा एलिवेटेड खंड नागपुर और राजधानी हैदराबाद के बीच सड़क नेटवर्क को बेहतर बनाने के लिए बनाया जा रहा है।

प्राधिकारियों ने एलिवेटेड पुलों के लिए खंडीय निर्माण प्रौद्योगिकी का चयन किया, तथा प्रत्येक भारी खंड को प्रीकास्ट यार्ड के गुणवत्ता-नियंत्रित वातावरण में ढाला गया।

इन पूर्वनिर्मित खंडों के बड़े आकार को ध्यान में रखते हुए, उपयोग में आसान उठाने वाली सामग्री का स्रोत प्राप्त करना आवश्यक हो गया है, जो उच्च भार को सहन करने में सक्षम हो।

डेक्सट्रा हॉट रोल्ड पूर्णतः थ्रेडेड बार उन आवश्यकताओं के लिए सबसे उपयुक्त थे।

इस परियोजना के लिए लॉन्चिंग गर्डर के साथ प्रीकास्ट सेगमेंट को उठाने और लॉन्च करने के लिए पूरी तरह से थ्रेडेड (एफटी) पोस्ट टेंशनिंग बार के 100 से अधिक सेटों की आपूर्ति की गई है, साथ ही एंड नट और कप्लर्स जैसे सहायक उपकरण भी दिए गए हैं।

डेक्सट्रा एफटी बार सिस्टम का उपयोग अक्सर अस्थायी अनुप्रयोगों के लिए किया जाता है जैसे कि भारी सामान उठाना और प्रीकास्ट तत्वों की सिलाई और स्टील फ्रेम सपोर्ट की एंकरिंग।

स्थायी अनुप्रयोगों के मामले में, एफटी बार्स का उपयोग खंडीय पुल निर्माण में गर्डरों और खंभों के कनेक्शन के लिए किया जा सकता है।

टेम्बुरोंग ब्रिज, जिसे सुल्तान हाजी उमर अली सैफुद्दीन ब्रिज के नाम से भी जाना जाता है, देश के उत्तर-पूर्व में ब्रुनेई खाड़ी में स्थित है। 30 किलोमीटर की लंबाई और चार लेन के साथ, यह दुनिया के सबसे लंबे समुद्री पुलों में से एक है।

यह पुल सुंगई बेसर और मेंगकुबाउ को जोड़ता है। यह यात्रियों को वर्तमान मार्ग पर चार आव्रजन चौकियों से बचते हुए, मलेशिया पार किए बिना दोनों क्षेत्रों के बीच यात्रा करने की अनुमति देता है, जहां अक्सर भीड़भाड़ रहती है।

डेक्सट्रा सीएसएल (क्रॉसहोल सोनिक लॉगिंग) परीक्षण विधि का उपयोग करके नींव ढेर की अखंडता परीक्षण के लिए 34,000 रैखिक मीटर सोनीटेक ट्यूबों की आपूर्ति करके इस परियोजना में शामिल है।

पुल का निर्माण 2014 में शुरू हुआ और 2020 में इसे आधिकारिक तौर पर यातायात के लिए खोल दिया गया।

छवियों का स्रोत: https://www.reduper.com/industry/traffic/bridge/sea-bridge/temburong-bridge/

Barapullah Elevated corridor is a major infrastructure project in India. The main purpose of this extension is to ease traffic congestion, as well as to provide a new express connectivity between Indira Gandhi International Airport and east Delhi.

Reinforcing the elevated road with PT bars

For the construction of this flyover, Dextra has been supplying its fully-threaded PT bars, as well as its well-known Bartec rebar splicing solution to the contractor L&T Construction.
The PT bar systems were applied in temporary applications of the construction project. Dextra fully-threaded post-tensioning bars are currently being used for lifting and launching the precast elements of the expressway’s elevated structures.

The Atlantic Bridge project, also called the Third Bridge Over the Canal, is being developed closed to the Atlantic Ocean entrance of the Panama Canal. This $600M project consists in construction of a 1-kilometer cable-stayed bridge, along with access viaducts on both sides and connections to the existing roads, as well as pedestrian and bicycle lanes. When archived, the bridge will allow vehicles to cross the Panama Canal even when the locks are in operation.

One of the World’s longest concrete cable-stayed bridge with Bartec

With its 530-meter central span and its vertical clearance of 75 meters above sea level allowing the passage of Post-Panamax ships, the four-lane Atlantic Bridge is one of the longest cable-stayed bridges in the World. It is also supported by two delta-shaped main pylons, reaching 212.5 meter height.
डेक्सट्रा लैटिन अमेरिका, with its main office in Panama City, was involved in supplying its rebar splicing solution Bartec for the reinforcement of the bridge’s concrete structure.

More than 350,000 Bartec couplers were delivered to the contractor VINCI Construction Grands Projets for the reinforcement of the bridge’s pile cages, pile caps and pylons for up to #14 (dia. 43 mm.) bars. Plus, three Dextra Bartec machine sets have been used to support the bar-end preparation on site.
Moreover, in order to avoid steel congestion in the heavily reinforced areas, more than 50,000 Dextra end anchors सिर वाली बार्स are used in the bridge’s pile caps.

The Atlantic bridge is now in its final construction stage, and is planned to open in early 2019.

Phuoc Khanh bridge is a 4.7-kilometer cable-stayed bridge linking Ho Chi Minh City with Dong Nai. The bridge is part of the southern Vietnam’s longest highway, Ben Luc – Long Thanh Expressway, running through Long An province, Ho Chi Minh City and Dong Nai province.
When completed, the highway will connect the south-western region with the south-eastern region of the country, facilitating the transportation between the two parts of the country with improved traffic flow and larger lanes. The project aims to develop the socio-economic activities of this area.

Dextra post-tensioning bars for permanent applications of the bridge

For the construction of the Phuoc Khanh Bridge, Dextra is supplying its post-tensioning bar systems as permanent post-tensioning anchors.
Over 250 high performance fully-threaded post-tensioning bars and over 200 smooth bar systems were delivered to site. Also known as PT bars, they are specifically designed for post-tensioned applications. They can be corrosion-protected as is the case for the equipment supplied in the project. The corrosion protection is done in a controlled facility in Dextra’s factory, before being shipped to site.

To learn more about our products, discover Dextra’s solutions for bridges and viaducts.

The Tuen Mun–Chek Lap Kok Link (TM–CLKL) is a road project between the Northwest New Territories and Hong Kong – Zhuhai – Macao Bridge, the Airport and North Lantau.

The total length of the road is around 9 km, consisting of two elements which are the Northern Connection and the Southern Connection.
The Northern Connection will join Tuen Mun Area 40 to Hong Kong Port through an undersea tunnel, while the Southern Connection will link the Hong Kong Port and North Lantau Island on viaducts.

Dextra supplied 100,000 Bartec rebar couplers for the structure of diaphragm walls and tunnels.

Full-performance Bartec couplers are an optimal replacement for rebar overlapping, reducing both cost of material and rebar congestion at the lap zone.

Moreover, to avoid rebar congestion in the ventilation building structure, more than 50,000 Headed Bars were applied at the top of the columns. Headed Bars act as a substitute for hook and long development length with more simple and effective anchorage.

The Southern Connection was opened in October 2018. The project is expected to be fully commissioned by 2020.

Pumarejo Bridge is a 3,200m-long bridge including an 800m-long cable-stayed section and 1,300m of viaducts as well as access roads.

The new cable-stayed bridge is located over the Rio Magdalena river in Barranquilla and the Salamanca Island Road Park in Sitionuevo, Colombia.

It replaces the old Puente Pumarejo: with its two lanes, the old bridge was no longer doing justice to the increased traffic, and it quickly became an obstacle for shipping on the Rio Magdalena due to a clearance below of only 16 meters.

The new bridge comprises of 6 lanes of traffic (3 lanes each way), 2 side bike paths and a pedestrian path along its side.

Dextra provided rebar connection solutions that were designed to reinforce the concrete structures.

More than 120,000 Rolltec couplers were provided for pier and deck reinforcements.

In addition, over a thousand of Unitec bolted couplers were applied for the connection rebars without the need of threading.

Since its completion, it became the longest road bridge in the country and one of the largest in Latin America.

Source of images: https://www.khl.com/international-construction/colombias-longest-road-bridge/139582.article, https://commons.wikimedia.org/wiki/File:Puente_ pumarejo.jpg

ठाणे-कलवा क्रीक ब्रिज भारत के कलवा नाका में ठाणे क्रीक पर लगभग 2.4 किलोमीटर लंबा यू-आकार का सड़क पुल है, जिसका उद्देश्य कलवा और ठाणे शहर क्षेत्रों में भीड़भाड़ के साथ-साथ ठाणे और नवी मुंबई के बीच यातायात की भीड़ को कम करना है।

डेक्सट्रा ने विभिन्न लंबाई में टेंशन रॉड सिस्टम के 20 से अधिक सेट वितरित किए (आपूर्ति की गई अधिकतम लंबाई ~ 24 मीटर है), आकार एम 108, ग्रेड 700, टोकरी हैंडल ब्रिज / स्टील आर्च ब्रिज के लिए सस्पेंडर्स के रूप में उपयोग किया जाता है।

तनाव छड़ें आमतौर पर ब्रेसिंग या सस्पेंशन तत्वों के रूप में कार्य करती हैं और उच्च शक्ति, लंबाई समायोजन, स्थापना में आसानी के साथ-साथ स्थापना के बाद तनावग्रस्त होने की क्षमता का लाभ प्रदान करती हैं। विभिन्न स्टील ग्रेड और कार्बन और स्टेनलेस स्टील दोनों में आकार और सहायक उपकरण की एक विस्तृत श्रृंखला उपलब्ध है।

पुल को मूल रूप से 2020 में खोला जाना था, लेकिन महामारी और उसके बाद के लॉकडाउन के कारण निर्माण में काफी देरी हुई।

The Braila-Tulcea Bridge is an under-construction road suspension bridge over the Danube river, between Braila, a major city in the east of Romania, and the opposite bank of the river in Tulcea County.

It will be the first bridge over the maritime sector of the Danube river, which will improve road traffic accessibility of the Galați-Braila area to Constanța and Tulcea, and connect Moldavia and Dobruja regions.

The suspension bridge will have a main span of 1,974m, two side spans of respectively 490m on the Braila bank of the river and 365m on the Tulcea bank of the river, along with two access viaducts of 110m length on both sides, and a connecting road with a total length of approximately 23km.

Dextra supplied 280,000 Bartec rebar couplers for the reinforcement of the suspension bridge structure.

Bartec coupler is compliant with seismic design under ISO 15835 category S2. It can withstand tension and compression of large deformation in case of violent earthquakes.

The construction of the bridge is anticipated to be completed in 2023.

Being the new fast-tracks linking the Center to the East of Thailand, the construction of Bang Pa-In – Nakhon Ratchasima Motorway is therefore considered one of the country’s major infrastructure projects.

The main purpose of this project is to stimulate the country’s economy. When completed, it will connect Thailand’s major urban centers within the Greater Mekong Sub-region.
The Intercity Motorway includes two sections: the six-lane 103-kilometer section from Bang Pa-In to Pak Chong, and the 93-kilometer four-lane from Pak Chong to Nakhon Ratchasima. Having been started in 2016, the project is planned to last until 2020.

The project’s required completion period of 4 years being challenging, the construction of the motorway has been divided into approximately 40 contracts to accelerate the project’s schedule.
To minimize potential impacts to local residents, a number of underpasses, overpasses and elevated structures (e.g. large viaducts) are provided throughout the Bang Pa-In – Nakhon Ratchasima Motorway.

Optimize the infrastructure project with Dextra’s rebar couplers

For the construction of the motorway’s elevated structure, the contractors of different packages opted for Dextra’s full performance Bartec rebar couplers to save time and money on the mechanical connection of the diameter 20mm to 32mm reinforcement bars.
Thanks to Bartec’s unique splicing system, all applications (Standard/ Position) can be fulfilled by one and only model of rebar coupler, reducing inventory management of the project to a minimum.
Further to this, Dextra’s Sonitec sonic tubes were also installed for cross-hole sonic logging tests in the foundations of the Bang Pa-In – Nakhon Ratchasima Intercity Motorway structures.

Dextra’s post-tensioning bars for the Motorway’s elevated structures

In addition to Dextra’s splicing and cross hole logging solutions, both smooth and fully-threaded Post-Tensioning bars were also used for both temporary (lifting and launching girder assembly) and permanent applications in segments. Approximately 28,000 sets of both PT bars have been delivered as per June 2018.
For more information about Dextra’s solutions in Thailand, please contact our Bangkok office.