Problem
The structure is a cut and cover tunnel reinforced concrete box that acts as
a cable and utility tunnel. The surface area of the total internal structure is
170.000sqm. The targeted area for the installation was 43.000sqm.
The tunnel is placed on reclaimed land and consists mostly of wet clay.
The water ingress problems started even before the laying of the tunnel
was completed. The regional state design institute was in charge of
choosing the waterproofing to be used in the design.
They had decided to implement Electro osmosis as the sole waterproofing
solution for the tunnel. No bentonite mats or other forms of waterproofing
was added to the design. The design institute endorsed the MPS for use
on the tunnel and later also the AOP system.
Challanges
There where several years of delay during the construction of the tunnel, but finally the MPS installation could commence.
We built a special jig which could cut multiple cuts in one pass and the anode installation turned out very nice.
After the anode and cathode installation was completed, Hydrotech terminated as a company and could not deliver the control
units or do the commissioning. In the wake of this, the Norwegian development department of Hydrotech, established a new
company called Triton Norway. We where asked by the Chinese regional design institute to complete the installation.
We further enhanced the MPS control units and designed a bespoke remote monitoring system specific for this installation.
We rebranded the name of the system to AOP and delivered 27 control units to cover the 43.000sqm target area..
Contract
The contract was let by Dalian Deli Electro osmosis technology ltd company and was tendered on the basis
of the spesifications from the regional design institute. The MPS and AOP was the preferred waterproofing system approved by
the design institute. The design institute was so convinced of the superiority of the MPS/AOP system, that they did not include
any other waterproofing solutions in the design of the tunnel.
The tunnel was placed underground on reclaimed land next to the sea and was exposed to massive amounts of water.
AOP system
The MPS System is an evolutionary technology based on an accepted theory. It gives new life to existing brick,
masonry and concrete structures avoiding expensive reconstruction and has a broad field of application in new
concrete structures. The “state of the art” methods in use in the building industry today can be characterised as
temporary solutions to a problem for which there is no apparent cost effective permanent solution. The MPS System
provides a permanent solution. The MPS System is utilised for transporting water encapsulated within the capillaries
out of structures, as well as permanently preventing the penetration of water into structures. A control unit produces a
low voltage electrical charge, which is passed through electrodes in the form of probes or wires strategically placed
within portions of the walls and/or floors which are wet.