Method for placing at least one duct/communication cable below a road surface in an area

1. Method for installing at least one duct/cable in an area for building a distribution network and/or an access network, said area comprising a first layer and a second layer, said first layer being a road layer, and said second layer being a bearing layer for said first layer and being located below said first layer, said method comprising the steps of:

designing a network layout for a distribution network and/or an access network in said area, wherein said network layout is for a plurality of ducts or cables having at least one size, and wherein said network layout comprises at least one micro trench and at least one splicing point, a branching from said at least one micro trench, and a final destination;

arranging said plurality of ducts/cables according to said network layout;

sawing a micro trench in said area through said first layer into said second layer using a sawing machine comprising a diamond saw blade arranged for up-cut rotation so as to remove sawing material from said micro trench, and a stabilizing device positioned immediately behind said diamond saw blade, said stabilizing device having a front part and a back part, wherein the shape of the front part is complementary to the shape of said diamond saw blade, and wherein said diamond saw blade and said stabilization device are arranged so that their respective working depths may be adjusted in order to adjust a laying depth, wherein the working depth for said stabilization device is less than the working depth for said diamond saw blade;

stabilizing the walls of said second layer in said micro trench by means of side elements of said stabilizing device;

installing said plurality of arranged ducts/cables in said micro trench, by means of guiding means comprised in said stabilizing device, into said second layer below said first layer according to said network layout, wherein said stabilizing device and said guiding means are dimensioned according to the number and size of ducts/cables for said network layout and wherein each guiding means is arranged to guide one or more ducts/cables for said network layout and wherein each guiding means is arranged to guide one or more of said ducts/cables for said distribution and/or access network so as to be located side by side and/or on top of each other in said micro trench;

successively routing each one of said plurality of ducts/cables to its endpoint, the endpoint being any of said splicing point, said branching and said final destination according to said network layout;

filling said micro trench with filling material after said plurality of arranged ducts/cables have been successively routed; and

sealing said micro trench with sealing material so as to restore said surface layer.

2. Method according to claim 1 , wherein said micro trench has a depth d>d 1 +d 2 , where d 1 is a depth of said first layer and d 2 is a height of said at least one duct/communication cable.

3. Method according to claim 2 , wherein said micro trench has a depth d between 200-500 mm and a width w between 10-30 mm.

4. Method according to claim 1 , wherein said step of sealing involves:

sealing said micro trench substantially flush to a bottom of said first layer; and

sealing said micro trench substantially flush to a surface of said first layer.

5. Method according to claim 1 , wherein said micro trench is sealed using one or more sealant in the group consisting of: concrete, cold asphalt, bitumen and polymer modified asphalt.

6. Method according to claim 1 , further comprising the step of:

making one or more branches connected to said micro trench.

7. Method according to claim 6 , wherein said one or more branches are bored by means of: a core drill or a hand-held sawing machine.

8. Method according to claim 6 , further comprising the step of:

boring one or more channels below said first layer from said one or more branching to one or more houses using controlled or guided boring.

9. Method according to claim 1 , further comprising the step of:

installing or blowing fiber into said plurality of ducts placed in said micro trench.

10. Method according to claim 1 , further comprising the steps of:

scanning said area by means of a ground penetrating radar;

identifying obstacles in said area using data generated by said ground penetrating radar;

wherein said steps of scanning and identifying are performed before said step of sawing.

11. Method according to claim 1 , wherein the filling material is sand.

12. Method according to claim 1 , wherein said plurality of ducts/cables have at least two different sizes.