Prestressed steel strand penetrating guide device and penetrating usage method

Abstract

The invention relates to a prestressed steel strand penetrating guide device and a penetrating usage method thereof, and belongs to the technical field of building construction of nuclear power stations. The device mainly comprises a guide head, a casing pipe, a spring and at least two clamping pieces, wherein the front end of the guide head is a guide end with a gradually expanding section; the rear end of the guide head is a combined end with an inner threaded hole; the excircle front end of the casing pipe is provided with an external thread matched with the threaded hole; a flaring segment which expands gradually is arranged at the front end of an inner hole of the casing pipe; the outer diameter of the spring is less than the major diameter of the front end of the inner hole; the inner diameter of the spring is more than the minor diameter of the inner hole; the envelope shape of the buckled clamping pieces is a conical shape matched with the flaring segment; and the envelope inner hole of the buckled clamping pieces is matched with the outer diameter of a steel strand. By adoption of the invention, the guide head cannot fall off the steel strand no matter whether the steel strand penetrates forwards or is pulled backwards, so that the penetrating operation in a prestressed hole channel is greatly facilitated, the construction efficiency is obviously increased and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to a beam threading guide device for prestressed steel strands, in particular to a beam threading guide device for prestressed steel strands, and a method for using the beam threading, belonging to the technical field of nuclear power plant construction. Background technique [0002] Post-tensioning prestressed systems such as containment shells of nuclear power plants require prestressed steel bars to be pierced after tunnel cleaning is completed. The guide device is integrally cast on the headgear. For prestressed tunnels with large apertures, large curvatures, many curved sections, and long lengths, such as the containment of EPR nuclear power plants, the disadvantage of the existing beam threading head is that the beam threading operation can only be performed forward and cannot be reversed. If one-time threading fails, the guide device will easily fall off and fall into the...

AI Technical Summary

Problems solved by technology

For prestressed tunnels with large apertures, large curvatures, many curved sections, and long lengths, such as the containment shell of an EPR nuclear power plant, the disadvantage of the existing beam piercing head is that it can only move forward and cannot go backward during the beam piercing operation.

If one-time threading fails, the guide device will easily fall off and fall into the tunnel when exiting and re-threading, which will cause troubles for subsequent construction, lead to delays in construction progress, increase scrap rate, and even bring hidden dangers to construction safety

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