Adding some pointers into the documentation, and as I realize
you're on the QGIS users mailing list, I'd suggest to also
consider contributing support for this procedure in the 
DBManager (core plugin) or the postgis topology editor plugin
(http://github.com/strk/qgis_pgis_topoedit).

Following, docs pointers

On Fri, Jan 20, 2017 at 11:37:02AM +0100, Sandro Santilli wrote:

> 1. Load the shapefile into a table

http://postgis.net/docs/manual-2.3/using_postgis_dbmanagement.html#shp2pgsql_usage

> 2. Create a topology

http://postgis.net/docs/manual-2.3/CreateTopology.html

> 3. Add a TopoGeometry column to the table

http://postgis.net/docs/manual-2.3/AddTopoGeometryColumn.html

> 4. Update the table setting the new column with toTopoGeom

http://postgis.net/docs/manual-2.3/toTopoGeom.html

--strk;
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