Special anchorage for combined variable-corrugated fiber sheets and prestressing force stretching method thereof

Abstract

The invention relates to a special anchorage device of a composite type variable corrugation fiber sheet material and the prestress tensioning of the same. The outer anchor shells of the special anchorage device are provided inside with locking square holes, wherein an upper corrugated clamping piece and a lower corrugated clamping piece inside a variable corrugation clamping piece are arranged inside the locking square holes; the upper top of each locking square hole is provided with a plurality of sets of pressure bolts to hang the upper corrugated clamping piece on the upper top of each locking square hole of the outer anchor shells; the inside of each outer anchor shell is provided with a perforated flat long narrow hole; a top pulling device is connected between the opposite sides ofthe flat long narrow hole of each outer anchor shell to form a unit outer anchor shell; and the unit outer anchor shell at one end of the top pulling device is a pre-anchoring end, while the other end of the top pulling device is a preadjusting end. Moreover, the special anchorage device adopts the technical proposal that: the outer anchor shells are fixed with the anchoring end of a box girder, and the unit outer anchor shell is fixed with the tensioning end of the box girder; meanwhile, the special anchorage device overcomes the disadvantages that: a prestressing fiber sheet material is easy to peel off and has low strength utilization rate, uneven anchorage device clamping force, easy looseness, high cost of a tensioning tool and complicated use and operation, etc. when reinforced and under stress; therefore, the special anchorage device can be used in a concrete box girder and a steel girder, etc. to realize external prestressing reinforcement and in the prior engineering member to realize reinforcement.

Description

[0001] Field [0002] The invention relates to a prestressed anchoring and tensioning device for structural components of buildings and bridges, in particular to a combined variable corrugated fiber sheet special anchor and its prestressing tensioning method. Background technique [0003] At present, many structural buildings in our country need to be reinforced and reconstructed due to various reasons, and some commonly used reinforcement methods have more or less defects. Therefore, continuous exploration of more effective, more reasonable and more economical reinforcement methods and reinforcement materials has become a research hotspot in the field of civil engineering today. In recent years, fiber sheet composite materials have been introduced into the field of construction and bridge structure reinforcement due to their high tensile strength, light weight, fatigue resistance and corrosion resistance, and have been widely used rapidly. As an ideal reinforcement material ...

AI Technical Summary

Problems solved by technology

However, the prestressed reinforcement method of fiber sheet composite materials also has deficiencies in its anchoring technology. First, it is necessary to establish a prestressed tensioning machine for fiber reinforced composite materials (FRP), which has complicated equipment, cumbersome operation steps and low tonnage; Secondly, the anchoring method of the FRP (fiber reinforced composite material) sheet is directly related to whether the reinforcement effect can be realized. Due to the poor shear resistance of the fiber sheet itself, the prestress will cause the shear stress concentration at the end of the FRP sheet, resulting in FRP sheets are prone to peeling and damage at the bonding interface with concrete, and the reinforcement effect is difficult to guarantee

Moreover, the cost of tensioning equipment is high, the actual use is inconvenient, a large working surface is required, the tensioning effect is difficult to guarantee, and the utilization rate of fiber sheet strength is still not high

[0004] In addition, the Chinese Utility Model Patent Authorization Announcement No. CN 2594357Y "High-strength Composite Corrugated Tooth Fixture Anchor" discloses a technical solution mainly composed of upper and lower corrugated tooth plates, stiffened corrugated plates, and pressing and locking devices. The disadvantage is that it is very inconvenient when it is stretched by the segmented stretching method. Because the flat jack has to rely on the upper and lower corrugated clips at the tensioning end, it can achieve uniform force during tensioning, and the upper corrugated When the clip is pressed on the fiber sheet, when the jack is stretched, due to the gravity of the upper corrugated clip itself, the fiber sheet will be greatly damaged and the tensioning effect will not be good.

It is also inconvenient when it is stretched by segmented stretching method. When it is used at the stretching end, the upper and lower corrugated clips will damage the fiber sheet

During the second stretching, due to the self-locking principle of the frictional force between the wedge-shaped corrugated clips, it is difficult to loosen the upper and lower corrugated clips, and the operation is cumbersome, which will damage the fiber sheet.

Images