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Feb 18, 2009

News

Herrenknecht AG

The renowned association of the US heavy construction industry, "The Moles", has presented the Schwanau entrepreneur Dr. Martin Herrenknecht with the "Moles Award 2009". This makes Martin Herrenknecht the first European and non-US citizen to be honored with this prize. "The Moles" award is highly regarded in the heavy construction industry in the US.

Aug 14, 2006

News

Borealis AG

Borealis, provider of innovative value creating plastics solutions, will be present at the Plastics Pipes XIII conference taking place on October 2-5 in Washington D.C. Borealis will present six technical papers covering a wide range of pipe solutions.

Apr 25, 2007

News

Institute for Underground Infrastructure (IKT)

In urban areas trees grow in the vicintity of sewers, drains and service pipes. Their roots grow into cracks and pipe connections. Furthermore roots find no natural soil to grow in. This leads to a couple of conflicts between trees and underground pipes.

Mar 27, 2008

News

Bran+Luebbe GmbH, An SPX Brand

The legally prescribed limit value in the outlet of municipal and industrial sewage treatment plants is reliable monitored by the Bran+Luebbe PowerMon Ionometer with high precision.

Nov 19, 2008

News

Borealis AG

A group of major European equipment technology developers and material producers, together with Borealis, a leading provider of innovative value-creating plastics solutions, have joined forces to design a single-stage production process for high-performance peroxidecrosslinked polyethylene (PE-Xa) pipes.

Sep 25, 2006

News

North American Society for Trenchless Technology (NASTT)

The Mid-Atlantic Society for Trenchless Technology offers a one-day Cured-in-Place-Pipe (CIPP) Good Practices Course, Thursday, Oct. 5, 8:30 am to 4:30 pm following the Rehab Road Show at the Radisson Hotel in Valley Forge, Pa. Course instructors are Chris Macey with UMA Engineering, Ltd. and Kaleel Rahaim with Interplastic Corporation.

Jul 23, 2009

News

S & P Consult GmbH

Last year, S & P Consult was tasked by Stadtwerke Essen with an extended assessment and evaluation of the condition of the combined sewer "Graitengraben" in Altenessen. The section to be inspected was about 750 m long, with four different cross sections and three special sections. In addition to the extended evaluation of the condition, we paid special attention to the appraisal of the stability analysis of the sewer section.

Jun 26, 2018

News

Jan Tøibner

Aarhus Vand and Blue Ocean Robotics have initiated a partnership to develop robotic technology for wastewater treatment plants. Drone technology for inspection of wastewater basins and sewage systems, as well as robotics for the maintenance of outdoor areas at wastewater treatment plants, have potential to both improve the working environment for the employees and make wastewater treatment cheaper and more efficient.

May 13, 2021

News

Lianne Ayling

Technology from wastewater treatment specialist WPL has been selected by Scottish Water to deliver enhanced ammonia removal at a village treatment works.

May 14, 2021

News

Pipeline Renewal Technologies

Download a free Small Diameter Lateral Cutter Guide from PRT

Apr 12, 2022

Article

Dipl.-Ing. Christoph Bennerscheidt

Drainage for a scattered settlement in the Carnic Alps

Jul 20, 2022

Article

Dipl.-Ing. Christoph Bennerscheidt

New DN 400 drinking water transport pipeline

Jun 18, 2019

News

Stacey Hajdak

Aqua America Inc. announced that Christine Saball will join Aqua as vice president, tax to succeed current VP Bill Jerdon, who plans to retire July 1. Saball, a CPA, will report to Chief Financial Officer Dan Schuller and oversee Aqua’s income tax functions with responsibility for tax planning, reporting, and compliance. She will manage a team assisting in regulatory filings, performing tax research, and providing budget and strategic guidance on tax matters.

Jun 19, 2019

News

Eva Ori

The Plastic Pipes Conference Association (PPCA) has issued a call for papers to be presented at its next conference and exhibition, Plastic Pipes XX. Hosted in Amsterdam at the Hotel Okura, this event will be held September 21 - 23, 2020.

CoJack is a new efficient method for the static calculation of jacking pipes for loads in the direction of the pipe axis. By means of algorithms especially developed by company Stein & Partner, it has for the first time been possible to accurately determine the constantly varying pipe stress during jacking processes. The rough simplifications of the currently used calculation methods are eliminated in order to optimise the safety and economic efficiency …

(Image: Presentation of a pipe jacking with an intermediate jacking station)

In this method, jacking pipes are jacked by pressing-in through the subsoil from a starting shaft to a target shaft with the aid of a jacking station as well as intermediate jacking stations.
Jacking in a straight or curved line path is made possible by means of a steerable shield machine positioned at the head of the first pipe. The spoil excavated at the working face is conveyed to the surface through the jacked pipe string.

(Image: View into …
(Image: Attention!)

With reference to the variant used to support the workface or to convey the excavated soil the technical components vary in pipe jacking.

(Image: Schematic presentation of a pipe jacking)

Advantages of trenchless technology compared to the open cut method:

  • Preventing break-up and replacement of road surface
  • Prevention of soil excavation masses
  • Minimizing groundwater retention measures
  • Little impairment to traffic flow especially in inner urban areas
  • Only short-term noise and emission pollution while excavating the starting and target shafts
(Image: Disadvantages of the open cut method for installing drains and sewers (Part 1) [GSTT])

The duties of the shield machine in pipe jacking are as follows [Scher77a] :

  • To protect the personnel,
  • To create the necessary cavity so that the following pipe string can be pressed in with a minimum degree of soil deformation and with the lowest possible skin friction,
  • To protect the cavity until the jacking pipes can finally carry all the loads and forces,
  • To secure the working face against collapsing soil and rock as well as groundwater, and
(Image: Overview of shield machine types)

Jacking pipes have a double function: They constantly support the excavated cavity and, in the case of a single shell lining, they provide the structure of the pipeline (final lining).

(Image: View into the jacking pipes) (Image: Reinforced concrete jacking pipes)
(Image: Joint of jacking pipes with loose steel guide ring for concrete, reinforced concrete or fibre cement)
(Image: Joint of jacking pipes with steel guide ring fixed single-sided )

In jacking processes, extensive and irreparable damages are frequently observed, which is due to irregularities of the subsoil.

Although extensive subsoil investigations can reduce the subsoil risk, failures and damages cannot completely be excluded.

(Image: Attention!)

These are the consequences of damages during pipe jacking:

  • Insufficient quality of the construction execution
  • Delay
  • High costs
  • Environmental impacts
(Image: Distribution of damages in pipe jacking in Germany (source: IFB, Hanover 1993))