Connecting device for prestressed steel strand – news

Connecting device for prestressed steel strand – news

Prestressed anchoring technology is more and more widely used in industrial and civil buildings, municipal roads and bridges, and mine tunnel support. The prestressed steel strand connecting device is a basic and important part of the anchoring system.

There are two ways to fix the prestressed steel strand: pre-tensioning method and post-tensioning method. The key of prestress technology is anchorage, and anchorage is one of the keys to ensure the safety and reliability of prestressed concrete structures. The stress of the anchors should be uniform. When the prestressed concrete project is too long, stretching the prestressed steel strand at the end of the concrete will cause a great loss of prestress.

In order to reduce the loss of prestress in prestressed concrete projects, it is necessary to use prestressed steel strand connectors to stretch prestressed steel strands in sections. At present, the existing prestressed steel stranded wire connector is easy to enter the cement slurry between the anchor and the anchor ring, which causes the anchoring end to be loosened before and during the tensioning, which causes the prestressed steel strand to be pulled during the tensioning. It affects the establishment of tension.

During the assembly process of the existing prestressed steel stranded wire connector, the strength between the anchoring end and the connecting sleeve is not high enough, which may easily cause the prestressed steel stranded wire and the connector to fall off, which affects the assembly quality and efficiency. Although different devices have appeared in the prior art to solve the above-mentioned problems, they still cannot solve the bottom problem.

In order to overcome the problem of insufficient clamping capacity of the existing prestressed steel strand connecting device, technicians provide a prestressed steel strand connecting device. In order to solve the above problems, the prestressed steel strand connecting device adopts the following technical solutions:

A prestressed steel strand connecting device is composed of an extrusion anchor, an anchor ring and a protective sleeve. The extrusion anchor is fixedly sleeved on the prestressed steel strand, the inside of the extrusion anchor is provided with rough arc-shaped convex strips partially embedded in the gap of the prestressed steel strand, and the outside of the extrusion anchor is equipped with non-slip rectangular strips, non-slip rectangular A high-strength spring is arranged above the strip, and the high-strength spring is fixedly connected with the yielding pad. The anchor ring is sleeved on the outside of the extrusion anchoring device and consists of two semi-circular anchors. The inside of the semi-circular anchor is provided with a groove corresponding to the non-slip rectangular strip, and the outside of the semi-circular anchor is provided with a rough spherical protrusion . The protective sleeve is fixedly sleeved on the outer side of the anchor ring, and rough spherical protrusions are arranged in the protective sleeve. Set at least ten sets of thick ribs and at least fifteen sets of high-strength springs; the extrusion anchor is made of soft metal aluminum; the anchor ring and protective sleeve are made of low-carbon alloy steel; the extrusion anchor, anchor ring and the protective sleeve All coated with anti-corrosion layer.

The beneficial effect of the above-mentioned prestressed steel strand connecting device is that the prestressed steel strand connecting device can well play the role of connecting the prestressed steel strand. The inner side of the extrusion anchor is provided with rough arc-shaped convex strips, so that the extrusion anchor and the prestressed steel strand are seamlessly connected, so that the prestressed steel strand and the extrusion anchor have a stronger clamping force and are not easy to slide . The non-slip rectangular strip on the outside of the squeeze anchor can also have greater tension and increase friction through the fastening force of the anchor ring, which can be ensured by the springs and yield pads arranged on the outside of the squeeze anchor.

By arranging spherical protrusions on the outside of the anchor ring and the inside of the protective sleeve to increase friction, it is not easy to slip. The prestressed steel strand connecting device has reasonable design, simple structure and convenient construction. It can effectively connect the prestressed steel strand and realize the segmented cutting and segmented tensioning of the prestressed steel strand. It can be widely used in prestressed concrete. Sectional tensioning or section-lengthening of prestressed steel strands in the structure.