Articulated prestressing tensioning device for shield tunnels and reinforcement method thereof

An articulated prestressed tensioning device suitable for shield tunnels, comprising:

• two sets of reinforcement components, wherein the reinforcement components are arranged opposite each other;
• a prestressing component disposed between the two sets of the reinforcement components;
• a prestressing rod disposed within the prestressing component, wherein the prestressing rod is subjected to prestress tensioning by the prestressing component, wherein both ends of the prestressing rod extend beyond the prestressing component, and wherein both ends of the prestressing rod are connected to the two sets of the reinforcement components via high-strength nuts;
• wherein each set of the reinforcement components comprises:
• a connecting rod reaction block, a lug plate with holes or apertures, and a connecting rod;
• wherein the connecting rod reaction block is rotatably mounted on the lug plate via the connecting rod, wherein an end of the prestressing rod is connected to the connecting rod reaction block via a high-strength nut, and wherein the lug plate is configured to be fixed to a shield tunnel segment via segment bolts;
• wherein the prestressing component comprises:
• two clamping steel plates, each of the clamping steel plates being provided with pre-drilled screw holes, comprising reserved screw holes;
• wherein the prestressing rod is disposed between the two clamping steel plates, and wherein the prestressing rod is connected to the clamping steel plates via wedge grips.