The construction design idea of the steel strand prestressed tensioning project is to control the tensile strength of the tension, which refers to the tensile force of the steel strand in front of the anchoring device after prestressing.
Therefore, when calculating the theoretical extension of the prestressed tensile foundation of the steel hinge line, the distance between the anchor points on both sides of the steel hinge line should be used as the calculated length of the steel hinge line, but the steel The operation of the hinge line controls the tensile force at the anchor point of the hydraulic jack tool,
Therefore, in order to facilitate manipulation and calculation, the distance between the anchor points of the steel hinge wires on both sides and the length of the steel hinge wires in tensioning jacks are usually used as the method for calculating the theoretical extension of the steel strand. The prestress of the length of the steel hinge line.
When prestressing the steel strand, the bare part of the steel strand is mostly wrapped by anchors and hydraulic jacks. The prestressed extension of the steel hinge line cannot be measured immediately and accurately on the steel hinge line. Therefore, the prestressed extension of the steel hinge line can be measured only by accurately measuring the stroke arrangement of the piston rod tensioning the jack.
But together, the number of retracted anchors should be reduced during the prestressing of the hinge wire. The carrying capacity of the steel hinge line should be 4-6 times the total driving force. You can select the appropriate steel strand according to this data and determine the specifications of the steel strand!