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2014 ISTT Award Winners

- Project HDD: Visser&SmitHanabbv , Rehabilitation of Lidcombe,  "Pre-Bent Drilling
- A New Application of HDD"
- Rehabilitation Project: UKDN Waterflow, "Protective Structural Lining of Ham Sewer" - New Machine: Catsurveys Group Plc, "Mobile Ground Penetrating Radar (MGPR)"
- Academy: Zhengzhou University and SAFEKEY Engineering Technology (Zhengzhou), Ltd., "Trenchless technology for repairing roads and underground infrastructures" 
(click here for the summary with images)

Category Name or Company CountryReason for Award
Project - HDDVisser&SmitHanabbvVisser&SmitHanabbv

Pre-Bent Drilling – A New Application of HDD

Visser&SmitHanab employed trenchless solutions to install muchof a new 30 km natural gas transmission pipeline located in Beverwijk and Wijngaarden Netherlands. The installation took place in challenging soil conditions and constrained rights-of-ways.

One section was particularly challenging due to a series of obstacles located along the path of the pipeline. These obstacles made use of traditional HDD unfeasible.

Visser&SmitHanab proposed to install a pre-bent the 48” pipe into a hole with a design radius equal to the pre bent pipe. A maxi rig could not be used to make the initial bore due to the very soft soil conditions and the relatively stiffness of rig’s drill pipe.

A smaller 27 ton rig with a more flexible drill pipe made the initial small ream and then pull the maxi rig drill string into the hole.

A maxi rig than reamed the hole to 60” and installed the pre bent pipe. The pre-bent 160m pipe string assembled in three sections, which were installed sequentially.

The installation was completed in 36 hours of non-stop operation. The use of HDD to install the gas pipeline in a site that initially appeared to preclude its use was a relatively simple innovative solution that saved time, simplified installation, and reduced neighborhood impact including potential damage to nearby structures.

Rehabilitation ProjectUKDN WaterflowUK

Protective Structural Lining of Ham Sewer

The Ham Sewer is a strategically important large diameter (2.06m) brick sewer that serves 2 million residents and businesses in East London. Two Crossrail tunnels were to be installed just below the Ham sewer. Vibration and ground movement associated with the installation of the tunnelsin such close proximity to the sewer put the Ham Sewer at substantial risk of being structurally damaged.

Based on modeling of likely ground movement, bending stresses, and settlements associated with the installation of the two tunnels, the UKDN Waterflow team decided to install a 50-metre continuous duplex stainless steel structural liner into a live sewer.

The project required the installation of two shafts. One shaft was used to over-pump wastewater flow from the Ham to the Wick sewer, and the other served as an access shaft for installation of the liner.

The liner was jacked into the masonry sewer on fixed rails in five-meter sections. Modified gun-sighting lasers ensured a precise alignment. Each section was full-penetration welded forming a continuous liner.The liner was grouted to help spread the loads created by the installation of the nearby tunnels.

The UKDN Waterflow’s trenchless solution was successfully engineered and executed as planned on a complex site without the knowledge of the general public preserving the structural integrity of the strategically important Ham Sewer.

New MachineCatsurveys Group PlcUK

Mobile Ground Penetrating Radar (MGPR)

Catsurveys Group has developed an innovative Georeferencing system and algorithm that allows the interlacing between data generated with a vehicle towed Mobile Ground Penetrating Radar (GPR) system (MGPR) and a Global Positioning System (GPS). The Catsurveys’ MGPR system uses a unique synchronization process to rapidly link large quantities of GPR data with its geographic location via GPS.

The MGRP uses a multitude of low and intermediate frequency antennas to boost the quality of data and its reliability. Double polarized antennas cover both longitudinal and transverse scans to create underground images. The mobile feature of the system allows for rapid data collection with minimal impact on traffic and associated traffic management requirements, reduce health and safety risks, and lower cost relative to traditional push GPR.

The MGPR system is and will be a key component for feasibly studies and civil engineering projects. Reducingrisks, costs and time.

AcademyZhengzhou University and SAFEKEY Engineering Technology (Zhengzhou), Ltd.China

Trenchless technology for repairing roads and underground infrastructures

Dr. Fuming Wang, Professor, Collage of Water Conservancy and Environmental Engineering, Zhenghou University, has developed a trenchless technique to restore the structural integrity of surface and underground infrastructure. 

This technique holds the promise of restoring the structural integrity of a road bed without excavation. Non-water reactive polymer grout is systematically injected to voids, cracks, soft soils in the sub-base of a roadway stabilizing the road bedding reducing the likelihood of settlement and damage to the roadway. The grout injection technique also can be used to restore the structural integrity of tunnels and other underground utilities and the grade of pipelines by eliminating sags at joints.

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