Prestressed Tensioning Equipment

Prestressing equipment is the device used to apply prestress. Prestressing generates prestress-related values through operation. Prestressing equipment primarily consists of a tensioning jack (tensioning jack) and an electric oil pump (tensioning oil pump). This equipment works together to increase the force of the steel strands or rebar in the anchors, thereby imparting prestress.

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Features
Technical Indicators
Overall Dimension

Selecting Prestressing Equipment Models: 1. The rated tonnage of the tensioning jack should be 1.5 times the tensioning force, and no less than 1.2 times. Calibration is required before use, with a calibration factor no greater than 1.05. Calibration should be performed monthly and no more than 200 tensioning operations. The stroke of the tensioning jack should meet the requirements of the tensioning process. 2. The pressure gauge should be vibration-proof, with a maximum reading of 1.5 to 2.0 times the pressure corresponding to the tensioning force. The accuracy should not be less than 1.0. Calibration must be performed by a metrology department before use and regularly during use. Calibration should be performed weekly. When using a 0.4 gauge, the calibration period may be one month. 3. The rated pressure of the oil pump should be 1.4 times the pressure corresponding to the tensioning force. The oil tank capacity should be 1.5 times the total oil output of the tensioning jack. 4. The tensioning jack, pressure gauge, and oil pump should be calibrated and used together. If any abnormality occurs during use, they should be recalibrated. Use and Maintenance of Tensioning Equipment: a. The voltage at the work site must not be lower than 360V. b. The hydraulic system must use pure hydraulic oil filtered through a 160-mesh oil filter. Do not mix two or more types. Seal the oil tank after refueling. Change the oil every three months, and clean the tank regularly. The oil tank should be heated in winter, and the oil pressure system should be maintained at normal pressure. c. Sufficient operating space must be provided to facilitate operation and avoid damage to the jack after pressurization. d. The operators of the oil pump and jack must work closely together. The oil pump may only be started after the jack is properly positioned. The oil pump operator must concentrate, slowly add oil, and monitor the oil pressure gauge. When the oil pump is fully tensioned or the cylinder is fully returned to the bottom, the control handle must be immediately placed in the neutral position to prevent a sudden increase in return oil pressure. e. During tensioning operations, the oil pump operator will be in charge of oil delivery and return operations under overall command. After completion, the power supply must be disconnected. The equipment must be properly stored and maintained. Hammers are strictly prohibited when disassembling or replacing parts. When replacing wearing parts, they must be replaced in the exact order they were disassembled and assembled. f. In the event of a malfunction, the equipment must be shut down immediately for inspection and can only be used after it has been corrected by maintenance personnel. High-pressure hoses must not be used to pull the jack or oil pump during transportation or use. g. Avoid disconnecting quick-change connectors whenever possible. If disconnection is necessary, keep them clean. Promptly tighten dust-proof nuts onto the jack's high-pressure hose and oil nozzle, and seal them with plastic bags to prevent debris from entering the hydraulic system and causing contamination and leaks. The oil hose should be coiled and stored. h. Oil pumps should be covered when stored outdoors.