Carbon fiber plate reverse tensioning prestressed anchor

Abstract

The invention relates to a carbon fiber plate reverse tensioning prestressed anchor, which comprises a tensioning end tensioning assembly fixedly arranged on a concrete and used for clamping the carbon fiber plate, a fixing end fixing assembly, and a tensioning tool for assisting the tensioning of the carbon fiber plate; the tensioning end tensioning assembly comprises a tensioning end fixing plate fixedly arranged on the concrete and a tensioning end clamp used for clamping the carbon fiber plate; The fixing end fixing assembly comprises a fixing end fixing plate fixedly arranged on the concrete and a fixing end clamp used for clamping the carbon fiber plate; the tensioning tool comprises a tensioning screw rod, a tensioning thrust plate and a tensioning top plate; and a jack is arrangedbetween the tensioning thrust plate and the tensioning top plate to push the tensioning end clamp to achieve reverse tensioning of the carbon fiber plate. According to the carbon fiber plate reverse tensioning prestressed anchor, the stress is not only uniformly applied on a reinforced concrete member but also maintained for a long time; and grooves are formed on the concrete surface, so that a minimum distance between the installed prestressed carbon plate and the concrete surface is ensured and a secondary damage to the concrete is avoided.

Description

technical field [0001] The invention relates to the construction field, in particular to a carbon fiber plate reverse tension prestressed anchor used in the bridge traffic field. Background technique [0002] Traditional anchorage refers to the permanent anchoring device used in prestressed concrete. It is an anchoring tool used in post-tensioned structures or components to maintain the tension of prestressed tendons and transmit it to the interior of the concrete. It is also called prestressed. anchorage. [0003] With the rapid development of the transportation industry, the road bridges at all levels built in the past are still shouldering the increasing traffic load and traffic volume. Due to the limitations of technical conditions such as early design, construction and maintenance, the old bridge gradually suffered from diseases. Although the newly built bridges in recent years have a short service period, due to the demand of economic development, vehicle overload, r...

AI Technical Summary

Problems solved by technology

Due to the high requirements for construction process control, the uneven technical level of each construction unit, and the quality of various parts of the prestressed system (such as anchorage splints, carbon fiber plates, structural adhesives, etc.), especially the quality of the prestressed system formed after mutual cooperation is difficult. control, it is difficult to guarantee the reliable clamping force of traditional anchors on carbon fiber plates

When the carbon fiber plate reaches the design tensile strength during construction and under normal impact fatigue load during the service period, the clamping force of the anchor must ensure that the plate does not slip, and at the same time, the anchor bolts that fix the anchor must not be sheared during stress work. If the steel of the anchor bolt is damaged by prying or the steel of the anchor bolt is cut, otherwise the reinforcement effect expected by the design cannot be achieved, resulting in waste of resources and potential safety hazards of the bridge; moreover, the traditional anchor is stretched in the forward direction, so sufficient construction space should be reserved at the tension end, resulting in The asymmetry of the effective coverage area of ​​the prestress increases the difficulty of the overall design work; in addition, when the traditional anchorage is installed, it is necessary to slot the surface of the concrete component, and only by embedding a part of the anchorage into the concrete component can the carbon fiber plate and the surface of the concrete achieve the ideal The distance ensures the load transfer effect of the structural glue, thus causing secondary damage to the foundation of the concrete member

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