Prestressed carbon fiber tensioning device

Abstract

The invention discloses a prestressed carbon fiber tensioning device. The device comprises a fixed end base, a fixed end anchoring block, a carbon fiber tensioning cable, a tensioning end anchoring block and a tensioning end base. The fixed end anchoring block and the tensioning end anchoring block are of cylindrical shapes and are fixed to the two ends of the tensioning cable; the tensioning endanchoring block is connected with one end of a tensioning screw, and the other end of the tensioning screw passes through a tensioning end through hole in the tensioning end base and is connected to ajack. By adopting the prestressed carbon fiber tensioning device, the area of a groove formed in concrete is small, the depth is also small, and the damage to the structural strength of the concreteof a bridge surface is smaller so as to maintain the overall structural strength of the bridge as far as possible.

Description

Technical field [0001] The invention relates to a prestressed carbon fiber tensioning device, belonging to the technical field of bridge concrete prestressing tensioning devices. Background technique [0002] At present, prestressed reinforced concrete structures are mostly used in bridges. The prestressed tension cables used in the reinforcement of bridge concrete structures are usually rectangular thin plates (strips or strips) with a width of 100mm, 50mm or 20mm and a thickness of 1mm to 3mm. The pre-tensioning method and the post-tensioning method are conventionally used to strengthen the method. Because the carbon fiber rectangular sheet is prone to cracking due to uneven force when applying tension, the reliability and safety of these two methods are poor when implemented, and the tension control stress can only play 40-50 of the standard value of the material. ﹪, the high-strength properties of carbon fiber have not been effectively used, and the effectiveness of structur...

AI Technical Summary

Problems solved by technology

Because the carbon fiber rectangular thin plate is prone to crack due to uneven force when the tension is applied, the reliability and safety of these two methods are not only poor in implementation, but also the tension control stress can only exert 40-50% of the standard value of the material. ﹪, the high-strength characteristics of carbon fiber have not been effectively utilized, and the effectiveness of structural reinforcement is also low

After the carbon fiber plate in the prior art is subjected to tension, the carbon fiber plate and the concrete structure layer need to be bonded with an epoxy structural adhesive with a filling thickness of 10-60mm (thick at the middle and thin at both ends). Such a thick glue layer not only The low elastic modulus of epoxy structural adhesive is not conducive to the transmission of structural force, and the cost of epoxy structural adhesive auxiliary materials is expensive, much higher than that of carbon fiber main materials. The disadvantage of poor cost performance has seriously affected the popularization and application of this reinforcement technology

In response to this situation, those skilled in the art have proposed the following solution, that is, to directly erect the fixed end and the tension end under the bridge to pull the carbon fiber sheet to make it close to the bridge deck. There are many slots for installing the fixed end base, the tension end base and the jack, and since there are also chutes in the square fixed end base and the tension end base, the chute is set There is an anchor block that can slide in the chute, and the tension cable is fixedly installed on the anchor block, so the area of ​​the base is larger, and the area of ​​the groove is also larger, which is not conducive to maintaining the overall structural strength of the bridge. In actual construction, the installation accuracy is required to be high. The installation position error between the fixed end base and the tension end base will easily cause the direction of the tension force of the jack to be inconsistent with the extension direction of the carbon fiber sheet, resulting in damage to the carbon fiber sheet and affecting the structural strength.

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