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INNOVATION UND QUALITÄT IN MICROTUNNELING
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Products

THE HYDRAULIC JOINT

The advantages
  • Higher jacking forces
  • Smaller curve radii
  • Longer jacking pipes
  • Permanent, real-time monitoring
  • Many intervention possibilities
  • Systematic secondary joint sealing
The added value
  • Optimum quality assurance
  • Minimal risk during jacking process
  • Shorter construction times
  • No need for intermediate shafts / installations
  • Increased leak tightness of the pipe joints
  • Wider range of applications
  • More economical
Minimum possible curve radii
Function
The safe transfer of the jacking force from pipe to pipe up to the tunnel boring machine (TBM) and tunnel face is essential in the microtunnelling and pipe jacking methods. The possibility of being able to transfer high jacking forces is indispensable for an efficient way of working.

Pressure transfer media made of wood materials prove their worth on straight tunnels. However, with larger joint angles and / or tighter curve radii, they reach their limits, i.e. only significantly smaller jacking forces Q can be transferred from pipe to pipe without damaging the pipes. Consequently, the admissible jacking force Q for articulated pipe joints and thus the jacking performance is significantly reduced. Articulation angles between jacking pipes occur not only as a result of planned alignment curvature, but also as a result of steering movements of the TBM, as a result of changing geological conditions and also as a result of manufacturing tolerances in the jacking pipes. The characteristic, irreversible material behaviour of a conventional pressure transfer ring made of timber results in stress concentrations on the inside of the curve when the pipe joint is articulated, which can exceed the strength of the pipe wall even at apparently small angles, while the joint on the outside of the curve is gaping and thus no jacking force is transmitted there.

EDAR®

Compared to conventional PTR made of wood materials, the EDAR® is characterised by the following relevant properties for the jacking process:

  • Higher jacking forces in curves.
  • Longer jacking pipes in curves.
  • Reliable monitoring thanks to reversible mechanical properties.

Beyond the construction phase, the EDAR® provides even more pro’s during the entire service life of the structure:

  • High quality and continuous joint sealing across the entire pipe circumference.
  • Internal joint seal with an inorganic, hemically inert and thus permanently stable material, even in the extreme conditions of a sewer (this in contrast to PTR made of wood materials that rot and promote fungus formation).
  • In combination with appropriate pipe surfaces, the possibility of activation as an internal joint seal, depending on project requirements combined with injections / grouting.
EDAR

JCGrout

A specially designed tunnel vehicle, the Compact Tunnel Rover (CT Rover), has been developed to perform the JCGrout injections.

The key features of the CT Rover are:

  • Pipe diameter application range: DN 1200 mm to DN 3500 mm
  • Crew of two
  • Autonomous (battery) operation for at least 5 hours
  • On-board lighting
  • High safety standard (various limit switch enables required for movement, self rescue of the crew using the accompanying mobile stretcher)
  • Simple and efficient handling
  • Comfortable workplace even in confined spaces with

JCFlex

As the Hydraulic Joint cannot be implemented as a closed ring, there is an interruption or opening between the two ends of the Hydraulic Joint (fittings).

In tunnels with required internal joint seal, the Hydraulic Joint can basically perform this function, except in the area of the cavity where the fittings are located.

Jackcontrol AG provides JCFlex, a joint sealant, to fill this “gap”. JCFlex basically consists of a suitable sealing compound based on silane-modified polymers. JCFlex can be used for internal cavities. However, JCFlex is not used for open (external) cavities; in this case, the cement paste injection JCGrout is suitable.

JCFlex

MT.Connect

MT.connect is completely compatible with the applications of VMT and Jackcontrol AG and will form the basis for many other applications in the tunnel over the next few years; the joint application brings considerable synergies and savings in time and costs. At the same time, MT.connect uses DSL technology and thus brings the large world of the Internet with its uncountable applications (e.g. LAN / WLAN, Internet telephony, VPN, video streaming, etc.) into the tunnel, which further makes everyday work on the construction site easier.

Complete solutions

In progress...

Address

Jackcontrol AG
Buchholzstrasse 50 | 8750 Glarus | Switzerland
Telefon +41 (0)55 650 20 20
info@jackcontrol.com | www.jackcontrol.com

Complete catalogue

Complete catalogue 2022/2023