Locking structure and tensioning holding component and implementation method and tensioning device for prestressed tendons

Abstract

The invention discloses a locking structure and a tensioning holding component and implementation method and tensioning device for prestressed tendons. The locking structure comprises a bevel gear nutand a bevel gear capable of being engaged with the bevel gear nut. The bevel gear nut is used for being in threaded connection to a to-be-locked component. An included angle is formed between the axis of the bevel gear nut and the axis of the bevel gear and is larger than 0 degrees and smaller than or equal to 90 degrees. The bevel gear is used for driving the bevel gear nut to rotate and can move in the axial direction of the bevel gear nut. By means of the structure, initial alignment of the bevel gear and the bevel gear nut and screwing of the bevel gear nut can be guaranteed, after beingscrewed in place, the bevel gear can be separated from the engaged state and does not continue to be screwed, wear of threads on the bevel gear nut and the to-be-locked component and wear of teeth onthe bevel gear nut and the bevel gear are greatly reduced, the locking effect is guaranteed by achieving good tightening, meanwhile, the service life of each component is prolonged, and the number oftimes of replacement and the use cost are reduced; and the locking structure is simple in structure, convenient to use and good in effect.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a locking structure, a prestressed tendon tensioning and holding component, a realization method and a tensioning device. Background technique [0002] In the past, in the production process of high-speed rail track slabs, whether it is pre-tensioning or post-tensioning, artificial single-stretched prestressed steel bars are used, such as figure 1 As shown, the ends of several prestressed steel bars arranged in the track slab mold 1 are connected with tension rods 2, and the tension rods 2 extend outside the wall of the track slab mold 1. In this way, all the prestressed steel bars on the track slab mold 1 are tensioned The degree of pull is different, which will affect the performance of the track slab and even lead to the scrapping of the track slab; in order to overcome the above problems and improve the automation level of the track slab production, the production line o...

AI Technical Summary

Problems solved by technology

[0002] In the past, in the production process of high-speed rail track slabs, whether it is pre-tensioning or post-tensioning, artificial single-stretched prestressed steel bars are used, such as figure 1 As shown, the ends of several prestressed steel bars arranged in the track slab mold 1 are connected with tension rods 2, and the tension rods 2 extend outside the wall of the track slab mold 1. In this way, all the prestressed steel bars on the track slab mold 1 are tensioned The degree of pull is different, which will affect the performance of the track slab and even lead to the scrapping of the track slab; in order to overcome the above problems and improve the automation level of the track slab production, the production line of the track slab unit assembly line is now used, such as figure 2 As shown, all the prestressed steel bars on one side of the track slab are stretched synchronously by the tensioner 3. After the tension is in place, a tension anchor component is set between the tension rod 2 and the wall of the track slab mold 1 to maintain the tension state

[0003] The Chinese patent application with the publication number CN109262827A discloses a tensioning and holding structure for the prestressed tendons of the prefabricated track slab. An external thread section is provided on the tension rod, and a nut driven by a friction wheel or a gear is provided on the external thread section. The nut driven by the method, so that after the prestressed tendon is stretched, the drive nut is close to and attached to the outer wall of the track plate mold to maintain the tensioned state of the prestressed tendon, although this overcomes the possible problems caused by the original anchor plate locking method The loss of prestress ensures that the tension of the track plate is qualified. However, the existing structures that use nut locking methods to maintain tension, including the above-mentioned patent applications, all have the problem that after the nuts have been attached to the outer wall of the track plate mold, the driving mechanism still remains The driving nut has a tendency to rotate, causing severe wear of the external thread section and the nut, or failure of the friction wheel friction wall, or gear wear, etc., so that the tension rod and the tension holding structure need to be replaced frequently, increasing the cost

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