Patent ID: 8328482

Claim:
A hydraulic tensioner for tensioning a foundation bolt, said bolt having a bolt diameter, said tensioner comprising: a) an outer body having a lower portion and an upper portion, said outer body defining an internal passage and comprising an internal annular shoulder, said outer body comprising an upper annular cap removably mounted at an extremity of said upper portion; b) an inner body slidingly received into said upper portion of said outer body, said inner body defining an internal passage suitably sized and shaped to allow said foundation bolt to extend therethrough, said internal passage being larger than said bolt diameter, said inner body comprising an external annular shoulder configured to define an annular pressure area with said internal annular shoulder of said outer body, said annular pressure area being configured to receive therein hydraulic fluid, said external annular shoulder defining an annular channel with said upper annular cap; c) at least one resilient element mounted in said annular channel and extending between said annular upper cap and said external annular shoulder, said at least one resilient element being configured to urge said inner body toward said internal annular shoulder; d) a hydraulic fluid inlet port mounted to said outer body and fluidly communicating with said pressure area; e) a split nut configured to be mounted to said foundation bolt, said split nut being configured to be engaged by said inner body; whereby when said tensioner is mounted to said foundation bolt, introduction of hydraulic fluid into said annular pressure area urges said inner body and said split nut upwardly, thereby tensioning said foundation bolt.