New Hybrid-Electric HDD Rig Cuts Fuel Costs in Half

Recently, Finnish manufacturer Visedo and Dutch industrial drilling equipment manufacturer Normag jointly launched a hybrid electric horizontal directional drilling (HDD) rig. Visedo’s managing director Pieter Dijkstra says the HDD system is a real innovation in the industry, unlike traditional hydraulic drivelines, which do not require dedicated generators as part of mobile drilling equipment, which will …

Tunnel Deformation and Its Control Technology

After excavation of tunnel, stress from initial stress field will be relieved, which will inevitably arouse deformation of various forms, such as arch crown subsidence, surrounding rocks from two sides squeezing in, bottom parts plumping up and tunnel face squeezing out, etc. Then it will cause slack, even instability and collapse. So the purpose of …

The Designed Tension of Self Drilling Hollow Bar

Self drilling hollow bar’s designed tension is mainly depended by possibility, reliability and convenience of construction technique. If tension designs too big, accordingly, the cross section and gravity are big, then it is difficult for inserting into hole and construction quality cannot be guaranteed, also it’s not easy to handle if tension test and validation …

Main Functions of Geotechnical Anchoring

The fundamental principle of geotechnical anchoring is to transfer tension of structures or keep self stability of excavation face in stratum, relying on shearing strength of hollow anchor bolt’s surrounding stratum. The main functions of geotechnical anchoring are: 1. Providing resisting power on structures for bearing external load. It directs at point contacting stratum. 2. …

The Silvertown Tunnel

The Silvertown Tunnel is a proposed new twin-bore road tunnel under the River Thames in East London that would connect the Greenwich Peninsula and West Silvertown. It is being promoted by Transport for London (TfL). Construction of the new twin-bore road tunnel would begin in 2019 and then open in 2023, helping to ease the …

Tunnel Construction on Copenhagen’s Cityringen

The four TBMs excavating Copenhagen’s Cityringen have completed their drives, twin tunnels comprising 15.5km in long. Launched in 2013, the TBMs faced lime, gravel, sand and stone along with major challenges like passing below historic buildings, and difficult geological conditions such as the valley next to City Hall. Tunnels have an inse diameter of 4.9m. …

Sydney Metro Tunnels Project

Construction of the second stage of Sydney Metro tunnels project will begin this year on the twin tunnels that will start at Chatswood and travel beneath Sydney Harbor, through the CBD to Sydenham and on to Bankstown. Planning includes: delivering 16.5km of new metro rail between Chatswood and Sydenham, including 15.5km of new twin railway …

Pakistan 84-MW Matiltan Hydropower Project

Pakistan announced on Dec. 2 that it was beginning construction of the 84-MW Matiltan run-of-the-river hydropower project. The scheme is located in the Gorkin Matiltan region of Kalam Valley in the district of Swat on the left tributary of the Suvastu River in Khyber Pakhtunkhwa (KPK), Pakistan. Pakhtunkhwa Energy Development Organization, based in Pakistan, is …