Lincoln Castle, Lincoln- Slope stabilisation with ground anchors and masonry thumb_Generalreinforcement

   

Lincoln Castle is an 11th century earthwork motte and bailey fortress, founded by William the Conqueror.  A partial collapse of a masonry wall on the eastern motte resulted in material falling into the carpark situated around the base of the castle.  Consulting Engineers Mouchel attended site to inspect the situation and sought advice from Platipus Ground anchors.  Topbond are an approved installer of the ground anchors with extensive experience and were able to visit site within 24 hours.

 Following the site meeting a scheme was developed which required the partial demotion of a small poor quality Victorian masonry wall built on the motte, necessitating a limited regrade of the earth in the immediate vicinity.  Following this Topbond installed approximately 700m2 of Macmat-R geonetting, stitching the edges of the overlapping netting, to form one composite membrane.  The geonetting was held in place by 400 Platipus SO4 geo-anchors, driven to a depth of up to 2m on a diamond formation.

 A small section of brickwork, which formed a retaining wall around a terraced area towards the bottom of the motte, was restrained with SO8 ground anchors and the brickwork around the anchors was strengthened with masonry reinforcement.