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Aug 04, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with pneumatic spoil removal

Experience gathered at sites [Reith98] has shown that they are at their best in cohesive soils with a large percentage of particle sizes < 0.5 mm. The main advantages here are economic as the separation plants required with hydraulic spoil removal for separating the slurry are less effective in this size range.

Area of application of microtunnelling with pneumatic spoil removal:

  • nominal pipe size range of DN/ID 200 (8 in) up to a clear width < 1200 …

Aug 04, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with pneumatic spoil removal

The jacking performance of microtunnelling with pneumatic spoil removal is subject to the following influence:

  • subsoil conditions and type of soil (cohesive, non-cohesive)
  • jacking distance
  • jacking technology (design of the cutting head)
  • number and qualification of the personnel (especially the experience of the machine operator)
  • construction-site-specific boundary conditions (e.g. space)
  • jacking pipe (nominal pipe size, material, quality)
(Image: …

Aug 04, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with pneumatic spoil removal

(Image: Pros and cons)
(Table: Advantages and disadvantages of microtunnelling with pneumatic spoil removal)

Aug 01, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Aug 05, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with scraper spoil removal

(Image: Microtunnelling with spoil removal by other mechanical means (spoil removal by a scraper arrangement))

Method of operation and procedure

Microtunnelling with scraper spoil removal is marked by pipe jacking with the simultaneous excavation of soil at the work face by means of a cutting head and continuous or discontinuous soil removal with a scraper arrangement.

One representative of this group is the Swedish LUNDBY method [FI-Skansb].

Aug 05, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with scraper spoil removal

Nowadays this method, which was originally developed for the nominal size range from DN/ID 400 (16 in), is only used in the nominal size range 800 ≤ DN/ID ≤ 2750 (32 in to 108 in) (from a clear width > 1200 mm (48 in) referred to as manned pipe jacking). It is therefore ideally suitable for very soft, cohesive clay with a clay concentration of ≥ 40% and one-axial uniaxial compressive strengths ≤ 0.05 N/mm2.

(Image: Conveying of soil with the LUNDBY …

Aug 05, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with scraper spoil removal

Area of application of the LUNDBY method:

  • nominal pipe size range from DN/ID 800 (32 in) up to a clear width < 2750 mm (108 in) and a jacking distance ≤ 150 m (492 ft)

  • usually straight bores; cohesive, saturated soil of classes LBM 1/LBO 1 with N-values ≤ 4
(Image: Attention!)

Empirical value for the jacking performance in the LUNDBY method: 1.25 to 4.2 m/h

Aug 01, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Aug 05, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with soil displacement

(Image: Microtunnelling with soil displacement)

Method of operation and procedure

The group of microtunnelling with spoil displacement is characterized by the single-phase jacking of pipes with simultaneous displacement of the soil by means of a displacement and steering head, e.g. no system for removing the soil is provided.

The method of operation and equipment of the single-phase microtunnelling method with soil displacement are basically identical …

Aug 05, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Microtunnelling with soil displacement

Microtunnelling methods with soil displacement are used exclusively in displaceable soils with or without groundwater.

(Table: Areas of application of microtunnelling methods with soil displacement according to the manufacturer's information)

Aug 01, 2008

Modules

Utility Tunnelling - Microtunnelling - Part 1

Jul 01, 2021

Modules

Micro tunnelling refers to unmanned, remote-controlled methods for jacking pipes.

This module covers the various methods, in particular, micro tunnelling with hydraulic, pneumatic, auger and scraper conveyance and soil displacement. The focus is on single- and two-phase micro tunnelling, the technical components in micro tunnelling and areas of application.

After completion of this module, you will have a sound knowledge of:

-spectrum of process technologies;
-machine and control components and
-their functions;
-advantages and disadvantages as well as
-areas of application.

Jan 01, 1900

Modules

Utility Tunnelling - Introduction

Today, supply and discharge lines are still predominantly installed using the open-cut method. This involves digging a trench, installing the lines under the protection of an embankment or sheeting, and subsequently refilling the trench.

However, due to numerous disadvantages and growing public environmental awareness, it is becoming increasingly important to consider trenchless technology as a viable alternative. Trenchless technology offers significant …

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Introduction

(Image: Overview of the present underground infrastructures)

A functional and efficient line network is a fundamental prerequisite for the functioning of human communities and urban development. Such networks ensure a reliable supply of:

  • Water
  • Gas
  • District heating
  • Electricity
  • Telecommunication

Additionally, they enable environmentally friendly disposal, which includes the collection and discharge of sewage.

Jun 20, 2006

Modules

Utility Tunnelling - Introduction

Introduction

(Image: Infrastructures in the urban underground [FI-Steina])

Jun 21, 2006

Modules

Utility Tunnelling - Introduction

Introduction

(Image: Documentation)

Accurate piping documentation is often unavailable. Even the owners of pipe networks frequently lack detailed knowledge about the exact positions of their pipelines.

As a result, it cannot be assumed that pipeline distribution in underground construction adheres to standard guidelines.
(Image: Underground pipelines in New York about 1916 [Boegl69]) (Image: Unprofessional installed cables and pipelines [FI-Feuera])

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Introduction

Open-cut method of construction

(Image: Open cut method)
(Image: Sheeted trench for the installation by open-cut method of construction) (Image: Urban installation of pipelines)

Trenchless method of construction

(Image: Geschlossene Bauweise)
(Image: Accessible city centre area in spite of construction works) (Image: Accessible city centre area in spite of construction works)

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Definitions

…

Trenchless construction technique:
Any technique for constructing pipelines underground without the need to open trenches  [DINEN12889:2000].
(Image: Shield machine arriving in the target shaft)
(Image: Microtunnelling machine with pneumatic spoil removal (method AVP [FI-Herreb]) - Scraper cutting head with view of the rotary vane lock behind the excavation chamber)
(Image: Microtunnelling machine with auger spoil removal ? cutting head)

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Overview of techniques

(Image: Manned techniques)

manned

 (Image: Unmanned techniques)

unmanned

(Image: Steerable techniques)

steerable

 (Image: Steerable techniques)

steerable

 (Image: Non-steerable techniques)

non-steerable

(Image: Soil removal techniques)

soil removal

 (Image: Soil removal techniques)

soil removal

 (Image: Soil displacement techniques)

soil displacement

 (Image: Soil removal techniques)

soil removal

 (Image: Soil displacement techniques)

soil displacement…

Jul 31, 2008

Modules

Utility Tunnelling - Introduction

Overview of techniques

(Image: Manned techniques) 

Manned technique:
A method in which personnel work inside the excavated bore during the installation process [DINEN12889:2000].
(Image: Unmanned techniques) 

Unmanned technique:
A method that avoids the use of personnel working inside the excavated bore during the installation process  [DINEN12889:2000].

Aug 01, 2008

Modules

Utility Tunnelling - Introduction

Overview of techniques

(Image: Steerable techniques)

Steerable techniques:
Techniques which allow for a correction of the direction of the cutting head, the steel pipe joint or auger flight [Stein05a].
(Image: Non-steerable techniques)

Non-steerable techniques:
Techniques which do not allow for a correction of the direction of the cutting head, the steel pipe joint or auger flight [Stein05a].

Aug 01, 2008

Modules

Utility Tunnelling - Introduction

Overview of techniques

(Image: Soil removal techniques)

Soil removal techniques:

Jacking pipes are jacked either dynamically or statically from a starting shaft to a target shaft. During this process, the soil or rock material loosened by the jacking is transported away, either continuously, in intervals or after the boring is completed [Stein05a].
(Image: Soil displacement techniques)

Soil displacement techniques:
These techniques involve the static or dynamic jacking

Jul 07, 2006

Modules

Utility Tunnelling - Introduction

Overview of techniques

(Image: Overview of the methods of trenchless installation of cables and pipelines by jacking or drilling)

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