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
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®
- 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.
JCGrout
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.