UNITRACC - Underground Infrastructure Training and Competence Center

SM-V5 - working face with earth pressure support

Critical operating condition - condition 5

Critical operating condition - Condition 5

Resulting from condition 4 if the too low conveyor performance of the spiral conveyor is not immediately corrected.
With growing torque and reducing jacking speed the mud warms up increasingly.
Warming increasingly affects the solidification and sticking tendency.
In an extreme case the solidification reaches the entire excavation chamber starting from the centre of the excavation chamber.
Consequence: …

May 18, 2020

SM-V5 - working face with earth pressure support

Critical operating condition - condition 6

(Image: Operating condition when encountering an obstacle (Condition 6) with reference to [Maidl97b] [Image: S&P GmbH])

Critical operating condition - Condition 6: Encountering an obstacle

When encountering an obstacle (e.g. a boulder), the contact pressure force must be increased.
Consequence: control and transfer of the required support pressure from the pressure bulkhead via the mud in the surrounding subsoil is immensely impaired.

(Image: EPB shield …

May 18, 2020

SM-V5 - working face with earth pressure support

May 18, 2020

Obstacle removal

Obstacle removal in partial excavation

(Table: Obstacle removal in pipe jacking with partial excavation [FI-Steina])

May 18, 2020

Obstacle removal

Obstacle removal in full-face excavation

(Table: Obstacle removal in pipe jacking with full-face excavation [FI-Steina])

May 18, 2020

Obstacle removal

Obstacle removal in special forms

(Table: Obstacle removal in pipe jacking (special forms))

May 18, 2020

Obstacle removal

May 18, 2020

(Image: Attention!)

If the method is changed, the principle of supporting the working face during jacking is changed. By doing so the technique-specific limits of application can be shifted and/or extended.

It is distinguished between:

unscheduled change of method by modification
schedules change of method by modification
scheduled change of method by conversion.

[Tunnel01]

In all cases, access is necessary for carrying out the required mechanical …

May 18, 2020

Unscheduled change of method by modification

Unscheduled changes of the method by means of modification are carried out from the pipe string or from a specially excavated auxiliary shaft.

(Image: Pros and cons)

Disadvantages of unscheduled changes of the method by modification:

the modification is labour-intensive and time-consuming (might take weeks)
causes high costs due to the delay of the construction project
ground stabilization measures might have to be taken

(Image: Attention!)

May 18, 2020

Scheduled change of method by modification

(Image: Attention!)

An expected or scheduled change of method technology must be taken into account early on in the planning phase.

If a modification in the shaft is not possible due to topographical or other reasons, then it is carried out in the protection of a specially built station through the pipe string [Tunnel01].

(Image: Pros and cons)

Disadvantages of scheduled change of method by modification:

modification is labour-intensive and …

May 18, 2020

Scheduled change of method by conversion

(Image: Attention!) A scheduled change of method by conversion can only be carried out with shield types that are further developed for this purpose.
(Image: Pros and cons) The advantages of scheduled change of method by conversion: conversion can take place in each spot of the jacking route relatively short conversion times if the subsequent material conveying does not have to be changed	(Image: Pros and cons) The disadvantage of scheduled …

May 18, 2020

Conventional changes of method by conversion

(Table: Conventional changes of method by conversion in pipe jacking [Tunnel01])

May 18, 2020

Change of method

May 18, 2020

Errors and consequences of damage

Damages in pipe jacking

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 be completely excluded.

(Image: Attention!)

These are the consequences of damages during pipe jacking:

Insufficient quality of the construction execution
Delay
High costs
Environmental impacts

May 18, 2020

Errors and consequences of damage

Damages in pipe jacking - statistics

(Image: Distribution of damages in pipe jacking in Germany (source: IFB, Hanover 1993))

May 18, 2020

Errors and consequences of damage

Indication: Leaking Pipe Connection

May 18, 2020

Errors and consequences of damage

May 18, 2020

NA-21 Utility Tunnelling: Pipe Jacking - Part 2

Today, the installation of gas, water and wastewater pipelines is still predominantly carried out using open trenches. In view of the numerous disadvantages associated with this method, it is imperative that trenchless pipeline construction be considered much more strongly in the future than it has been to date, as an alternative in the planning and construction of sewers and pipelines. This module deals in detail with the numerous different types of shield machines, obstacle removal and possible errors in pipe jacking and their consequences. After completing this module, you will have a sound knowledge of: - limitations of the use of shield machines and - errors and consequences of damage during pipe jacking.

Apr 14, 2005

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Imprint

Publication with friendly permission of the MUNLV NRW, DÃ¼sseldorf, Germany.

Imprint

Editor
Prof. Dr.-Ing. Stein & Partner GmbH
Konrad-Zuse-Str. 6
D-44801 Bochum
Phone: 0049-234-5167-0
Fax: 0049-234-5167-119
office@stein.de
www.stein.de

Compilation and Editing
University-Professor Dietrich Stein
Ansgar Brauer

Picture Editors
visaplan GmbH, Bochum
Prof. Dr.-Ing. Stein & Partner GmbH, Bochum

This guideline was originally published in German by the Ministry for Environment …

Jun 29, 2004

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Preface

(Image: Dr.-Ing. Robert Stein)

To the proper development of new construction areas also belongs the sewage disposal, of course. Also in the future it will remain necessary to build sewers new within the scope of site development. When rehabilitating sewers, which will be one of the main tasks of the local authorities, municipalities or sewer operators in the future, to an increasing degree a new line is chosen in dependence on its load and its condition, …

May 28, 2004

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Introduction

(Image: Disadvantages of the open cut method for installing drains and sewers (Part 1) [GSTT])

(Image: Disadvantages of the open cut method for installing drains and sewers (Part 2) [GSTT])

According to latest estimations [Dohma97], in the Federal Republic of Germany approximately 2000 km of sewers will have to be newly installed each year until 2015 with an investment volume of over 1.2 billion € per year. Over 80% of these sewers are < DN/ID …

Aug 03, 2005

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Pilot pipe jacking: Pilot boring by means of soil displacement and reaming boring by means of soil removal

Two-phase jacking

(Image: mts 400 method - pilot pipe jacking in two phases - 1st phase: pilot boring by means of soil displacement with reference to [FI-mts] [Image: S&P GmbH])

(Image: mts 400 method - pilot pipe jacking in two phases - 2nd phase: reaming boring by means of soil removal and jacking of the product pipes with reference to [FI-mts] [Image: S&P GmbH])

(e.g. methods mts 400 [FI-mts], RVS 80 and 160 [FI-Wirthb], BM 300, 400 and 500 [FI-Bohrt], PBA …

Aug 03, 2005

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Pilot pipe jacking: Pilot boring by means of soil displacement and reaming boring by means of soil removal

3-phase jacking

(e.g. methods mts 400 [FI-mts], RVS 80 and 160 [FI-Wirthb], BM 300, 400 and 500 [FI-Bohrt], PBA 85 [FI-Schmi])

(Image: mts 400 method - pilot pipe jacking in three phases - 1st phase: pilot boring by means of soil displacement with reference to [FI-mts] [Image: S&P GmbH])

(Image: mts 400 method - pilot pipe jacking in three phases - 2nd phase: reaming boring by means of soil removal and jacking of the temporary pipes with reference to [FI-mts] […

Aug 03, 2005

Practical Guideline for the Application of Microtunnelling Methods for the Ecological, Cost-Minimised Installation of Drains and Sewers

Pilot pipe jacking

Pilot pipe jacking: Pilot boring by means of soil displacement and reaming boring by means of soil removal

May 28, 2004