Pre-stress rebar anchoring device

Abstract

The invention discloses a pre-stress rebar anchoring device. Pre-stress rebar adopts finish rolling deformed steel bar, and the innovation is characterized in that the device is composed of an anchorbearing plate, a positioning nut and an anchoring nut; the middle of the anchor bearing plate is provided with a first threaded hole, the anchor bearing plate is pre-buried in the top face of a beam body of a box-shaped section bridge, the surface of the lower end of the positioning nut is provided with a first outer thread, the middle of the positioning nut is provided with a second threaded hole, and the positioning nut is in threaded connection with the first threaded hole through the first outer thread; the surface of the lower end of the anchoring nut is provided with a second outer thread, the middle of the anchoring nut is provided with a third threaded hole, and the anchoring nut is in threaded connection with the second threaded hole through the second outer thread; and the anchoring nut is in threaded connection with the finish rolling deformed steel bar through the third threaded hole. The pre-stress rebar anchoring device has the advantages that the structure of the deviceis simple and ingenious, the problem of stress loss during anchoring can be effectively solved, and the safety of the bridge structure is ensured.

Description

technical field [0001] The invention relates to a prestressed reinforcement anchoring technology, in particular to a prestressed reinforcement anchorage device. Background technique [0002] Existing long-span girder bridges usually adopt a box-shaped cross section. In order to ensure the structural stability of the bridge, when building this type of bridge, it is necessary to apply prestress in three directions on the box-shaped girder. The prestress in these three directions They are respectively the prestress along the axial direction of the box girder, the prestress along the transverse direction of the box girder and the prestress along the vertical direction of the box girder. The prestress in these two directions is usually achieved by tensioned steel strands, the size of the box girder in the vertical direction is relatively small, and the prestress in the vertical direction of the box girder is generally achieved by tensioning and finishing thread steel realization...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, when vertical prestressed steel bars are installed, the anchor plate is generally pre-embedded on the top surface of the beam body, and a straight hole is arranged in the anchor plate, and the finish-rolled rebar is threaded in the straight hole, and the surface of the finish-rolled rebar is provided with a Nut (finish-rolled rebar and nut thread connection), after the jack pulls the finish-rolled rebar into place, screw the nut in the direction of the anchor backing plate, so that the nut is pressed against the anchor backing plate, and finally loosen the jack; there is The problem is: Due to various reasons (such as processing errors, installation errors, etc.), the nut cannot fit perfectly with the anchor backing plate, resulting in a gap between the nut and the anchor backing plate after tightening. The steel will have a large stress loss, resulting in a low vertical prestress of the box girder, and due to the structural characteristics of the finished rolled rebar, it cannot be over-tensioned

[0004] In addition, in the prior art, when making hollow slab bridges, most of them adopt assembly-type construction methods. During assembly, the horizontal connection between the slabs is not strong enough, and it is difficult to form an overall force. Cracking damage occurs at the position; for the existing hollow slab bridges that have cracked joints, a reinforcement method is to install a reinforced steel beam along the transverse direction at the bottom of the bridge deck beam composed of multiple slabs, and the reinforced steel beam passes through the fine-rolled rebar It is connected with each hollow plate, so that each plate forms an overall force-bearing structure in the horizontal direction. When the finish-rolled rebar is installed, there is the same problem of tensile stress loss as the aforementioned vertical prestressed steel bar;

[0005] In addition, the existing technology also adopts an assembled construction method when making a small box girder bridge; during assembly, there is also the problem that the transverse connection between the beams is not strong enough; its transverse reinforcement method is similar to that of the hollow slab bridge, and the same There is a problem of tensile stress loss in finished rolled rebar

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