UNITRACC - Underground Infrastructure Training and Competence Center

Design of a microtunnelling machine with hydraulic spoil removal

(Video: Integrated high-pressure flushing system in the crusher space of the AVN microtunnelling machine)

Aug 04, 2008

Design of the cutting head

(Image: Microtunnelling machine with hydraulic spoil removal - Standard cutting head in the form of cutting wheels [FI-Herreb])

Standard cutting head:
Use in cohesive and non-cohesive soil in the form of cutting wheels with several spokes or more or less locked or lockable scraper cutting heads

(Image: Microtunnelling machine with hydraulic spoil removal -Rock cutting head with disc cutters [FI-Herreb])

Rock cutting head:
Use in rock and stony soil …

Aug 04, 2008

Design of the cutting head - examples

(Image: Microtunnelling machine with hydraulic spoil removal - Standard cutting head in the form of cutting wheels [FI-Wirthb])

(Image: Cutting head design for use in soil and rock - Scraper cutting head with fixed soil entry openings [FI-ICH])

Standard cutting heads

(Image: Cutting head design for use in soil and rock - Rock cutting head with (tungsten carbid) insert roller cutters [FI-Wirthb])

(Image: Cutting head design for use in soil and …

Aug 04, 2008

Advantages and disadvantages of microtunnelling with hydraulic spoil removal

(Image: Pros and cons)

(Table: Advantages and disadvantages of microtunnelling with hydraulic spoil removal)

Mar 02, 2011

Microtunnelling with hydraulic spoil removal

Aug 15, 2006

Microtunnelling with pneumatic spoil removal - description

(Image: Microtunnelling with pneumatic spoil removal)

(Image: Equipment, possible arrangement of the components on the construction site and space requirements (approximately L x W = 34 x 4 m) in microtunnelling with pneumatic spoil removal - plan view (on the model of the jacking of pipes DN/ID 600, pipe length 2.0 m))

Method of operation and sequence

Microtunnelling with pneumatic spoil removal on the basis of a suction plant is characterized …

Aug 04, 2008

Removal of the spoil

A distinction is made with regard to the discharge system, between

Suction plants
Pressure plants

The transfer point of the spoil to the respective discharge system, which at the same time acts as the point of pressure-tight separation between the excavation and crusher chamber, can be designed in a number of ways.

Rotary vane lock

(Image: HERRENKNECHT AVP method - View of the rotary vane lock behind the excavation chamber [FI-Herreb])

Spoil valve

(…

Aug 04, 2008

Design of the cutting head

Microtunnelling machines with pneumatic spoil removal are used with standard cutting heads as well as rock cutting heads so that the same areas of application are valid in soils and rock as with hydraulic spoil removal to [Becke96] [Wilhe99a].

(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)

Aug 04, 2008

Advantages and disadvantages of microtunnelling with pneumatic spoil removal

(Image: Pros and cons)

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

Mar 02, 2011

Microtunnelling with pneumatic spoil removal

Aug 05, 2008

Microtunnelling with scraper spoil removal

Microtunnelling with scraper spoil removal - description

(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 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].

Mar 02, 2011

Microtunnelling with scraper spoil removal

Aug 05, 2008

Microtunnelling with soil displacement

Microtunnelling with soil displacement - description

(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 …

Mar 02, 2011

Microtunnelling with soil displacement

Jun 28, 2021