In-situ tensioning system and method for beams and slabs reinforced with integrated prestressed fiberboards

Abstract

The invention discloses an in-site tensioning system for a reinforcing slab plate of an integral prestress fiber board. The in-site tensioning system comprises a tensioning end anchorage device, a fixed end anchorage device, a convex hydraulic jack and a two-section clip type clamp, wherein the tensioning end anchorage device and the fixed end anchorage device are anchored on a beam or a plate, and the convex hydraulic jack is connected with the tensioning end anchorage device. A cylinder with a cylinder cap is welded to the upper surface of the clip type clamp. A sleeve which is arranged outside the cylinder in a sleeving mode is connected to the convex hydraulic jack through a jacking rod. One end of the fiber board is clamped by the clip type clamp of the tensioning end, and the other end of the fiber board is anchored to the fixed end anchorage device. According to the in-site tensioning system, the anchorage devices serve as counter force devices of the hydraulic jack, and no additional device is needed to transfer the tensioning force of the hydraulic jack; and the cylinder and the cylinder cap are arranged on the clamp and connected with the sleeve, the connection mode between the jacking rod and the clamp is changed from rigid connection into hinged connection, the eccentricity problem in the tensioning process can be effectively solved, automatic centering of the whole device is guaranteed, the reinforcing cost is reduced, force transferring is direct, and the anti-seismic performance and fatigue resistance are good.

Description

technical field [0001] The invention relates to the technical field of civil engineering and transportation, in particular to an in-situ tensioning system and method for reinforcing beams and slabs with integrated prestressed fiberboards. Background technique [0002] Due to the influence of material aging, construction quality, natural or man-made factors, many existing bridge projects and houses urgently need to be repaired and reinforced, and countries all over the world spend huge sums of money on this every year. Fiberboard is lightweight, high-strength, and corrosion-resistant. Sticking the fiberboard on the surface of the component and pulling it can enhance and improve the mechanical performance of the component. Using fiberboard with high rigidity and applying prestress to it is an effective way to solve the above engineering problems. By applying prestress to the fiberboard and anchoring it at both ends of the concrete member through a special anchorage, the stren...

AI Technical Summary

Problems solved by technology

However, due to the separation of the anchorage and the fixing device in the existing prestressed fiberboard tensioning system, the tensioning system is too bulky and the force transmission is not direct, the construction is inconvenient, and materials are wasted; and the existing devices are prone to eccentricity problems during the tensioning process , resulting in uneven tensile stress of the slab, and premature failure during the loading process; in addition, the existing device has too large a slotted area for the beam, causing serious damage to the beam

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