US 12,007,060 B2
Method for filling a trench comprising a pair of conduits and such a filled trench
Per Rosén, Lund (SE); Jacob Skogström, Lomma (SE); Bengt Lindoff, Bjärred (SE); and Fredrik Rosenqvist, Helsingborg (SE)
Assigned to E.ON SVERIGE AB, Malmo (SE)
Appl. No. 17/309,553
Filed by E.ON SVERIGE AB, Malmo (SE)
PCT Filed Dec. 3, 2019, PCT No. PCT/EP2019/083413
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2020/115013, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 18210807 (EP), filed on Dec. 6, 2018.
Prior Publication US 2022/0018488 A1, Jan. 20, 2022
Int. Cl. F16L 59/15 (2006.01); F16L 1/028 (2006.01)
CPC F16L 59/15 (2013.01) [F16L 1/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A filled trench comprising:
a pair of conduits for delivering fluid with a different temperature in each of the conduits, the pair of conduits being surrounded by filling material;
a first section filled with a filling material of a first type, wherein the first filled section of the filled trench occupies a space surrounding a first conduit of the pair of conduits; and
a second section filled with a filling material of a second type, wherein the second filled section of the filled trench occupies a space surrounding a second conduit of the pair of conduits;
wherein the filling material of the first type has a first thermal conduction coefficient and the filling material of the second type has a second thermal conduction coefficient, the second thermal conduction coefficient being different from the first thermal conduction coefficient.