Prestressed pipeline friction testing apparatus and installation method of apparatus

Abstract

The invention relates to a prestressed pipeline friction testing apparatus and an installation method of the apparatus, belonging to the technical field of prestress testing equipment. The prestressed pipeline friction testing apparatus is improved based on the traditional prestressed pipeline friction testing method, and aims at overcoming the defects of the existing prestressed pipeline friction testing method of a bridge. Under the condition that the structure and the stress of a pressure ring are not influenced, the prestressed pipeline friction testing apparatus and the installation working procedures of the apparatus are improved, so that the demand of a construction site can be met. The prestressed pipeline friction testing apparatus which is simple, efficient and safe is provided by the invention.

Description

technical field [0001] The invention relates to a prestressed pipeline friction test method, which is based on the traditional prestressed pipeline friction test method and improved. By improving the installation process and testing device of the prestressed pipeline friction test, the prestressed pipeline friction The resistance test operation process is simpler, more efficient, safer and more economical. Background technique [0002] At present, most of the prestressed pipe friction tests of bridges adopt the test method of installing pressure rings at both ends of the beam. Centering sleeve and tester, the installation sequence of the test equipment at both ends of the beam is anchor plate, centering sleeve, pressure ring, centering sleeve, tension jack, tool anchor, clip; the test method is firstly the steel strand in the pipeline The number of wires is used to determine the first-level and second-level tension of the pipeline friction test. The test equipment is instal...

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Problems solved by technology

In addition, the protruding steel strands are easy to be bent under compression and the webs at both ends of the beam body are arranged with shallow oblique square holes. In the actual installation process, it is difficult for the inner centering sleeve to align with the anchor plate. so that it is difficult for the pressure ring and the centering sleeves on both sides to be tightly centered and placed centered with the anchor plate at the beam end

The traditional solution is to use blocks such as square wood to align the height of the pressure ring and the centering sleeves on both sides with the anchor plate, and then install tension jacks; however, the construction platform at the beam end is often at the same height as the beam bottom plate. When the position of the anchor plate at the web is relatively high, the pressure ring and the centering sleeves on both sides will undoubtedly increase the difficulty of installation with square wood and other spacers.

[0005] When lifting or moving the tension jack left and right, the chain hook of the lifting equipment is hung on the wire rope on the tension jack, and the two ends of the wire rope are buckled on the front and rear buckles of the tension jack; when the tension jack is hoisted, under the action of gravity The hook slides on the wire rope so that the tension jack is in a horizontal state, and because the anchor plate at the beam end web is in a concave and inclined arrangement, the pressure ring and the centering sleeves on both sides that are closely aligned with the anchor plate must be in an inclined state , while the tensioning jack in the horizontal state is difficult to closely align with the obliquely arranged pressure ring and the centering sleeves on both sides, and it is difficult to manually adjust the inclination of the heavy tensioning jack

The traditional solution is to manually lift the steel strand at the end of the tensioning jack, so that the tensioning jack is tilted and closely aligned with the pressure ring and the centering sleeves on both sides, which undoubtedly increases the difficulty of installation

If the tension jack, the outer centering sleeve, the pressure ring, and the inner centering sleeve are not tightly aligned, the test accuracy will be affected, and the tension of the active end may be smaller than that of the passive end.

[0006] The prestressed pipeline friction test of bridges often needs to go to the construction site to conduct channel friction test on the cast-in-place girder body. The construction site often uses the traditional installation test process due to insufficient preparation, which not only causes waste of manpower and material resources, but also directly affects the test. Affecting the progress of construction

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