Drainage, lining, and suction prevention materials


Drainage, lining, and suction prevention material

By implementing unified forming of the ribbed structure and the lug parts, the drainage function and workability has been improved.

  • Geocomposite product

Products Outline


MONODREN RB is a drainage material developed for tunnel arch parts.

By adopting a unified form for the ribbed structure that is used for securing the flow amount and the lug parts which are used for fixing the material with nails, the drainage function and the workability have been improved. 


Because the drainage part has a ribbed structure, blockages due to the buildup of free lime rarely occur.

By integrating the lug parts for mounting at each end, the mounting by nailing can be easily implemented.

Measurement lines are provided at 1m intervals, so that the usage amount can be confirmed after mounting.

(Because two lines are incorporated, if the part between the lines is cut, measurement will also be possible from the end line.)

The material is made from polyethylene, which can be easily cut using scissors.

Because the material is thin, it will not interfere with the NATM sheet mounting.

The RB-3050FT has been improved to a type that supports the rear surface flat type tunnel insulated lining method (FILM).

By adding fins for preventing water inflow, inflow of the back filling material (mortar) to the inside of the drainage material has been reduced. (RB-3050FT)

By incorporating projections on the ribbed structure rear surface, adhesion with the back filling mortar has been provided. (RB-3050FT)

By attaching vertical grooves to prevent nail displacement, nail displacement during nailing is prevented. (RB-3050FT) 


Rear surface projections


Mortar adhesion

Application Example

NATM installation method usage example

縦断方向排水 インバーと下部排水


Usage examplesProduct No.Thickness (mm)Width (ribbed structure part) (mm)Total width (reference value) (mm)Length (m)Fin presence
Arch part drainageRB-30606.030060020Absent


Usage examplesProduct No.Tube diameter (mm)No. of tubesThickness x width (Reference value) (mm)Permeating water filterRemarks
Arch part drainageTK-3NT20323×120NetBoth fins provided with belts
Vertical (longitudinal) direction drainageM-3NT-S0530335×170NetOne fin
Invert bottom drainageMK-330335×170Nonwoven fabricFin width 150 or more

* Regarding the MONODREN (TK-3NT、MK-3NT) product diagrams, please refer to the MONODREN Catalog.