Prestressed pipeline friction loss test and calculation method

The technology of a prestressed pipeline and a test method is applied in the field of friction loss testing of prestressed concrete bridges and prestressed pipelines. high effect

CN112014310AInactive Publication Date: 2020-12-01GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a prestressed pipeline friction loss test and calculation method. The test and calculation method comprises the following steps: (1) carrying out multiple times of asymmetric tensioning and symmetric tensioning operations on a prestressed steel bundle, and recording related data; (2) deducing a calculation formula of a friction influence coefficient of the prestressed pipeline based on a stress uniform distribution principle in a Hertz contact theory; and (3) according to the deduced calculation formula, calculating a friction influence coefficient of the prestressed pipeline by utilizing the elongation difference of the prestressed steel beams which are tensioned twice, and evaluating the prestressed friction loss. The method is based on the stress uniform distribution principle of the Hertz contact theory and skillfully utilizes the Hooke law; the test method is convenient and economical, can effectively and reasonably calculate the friction influence coefficient and the prestress friction loss value of the prestress pipeline, and is suitable for prestress concrete bridges with symmetrically arranged prestress steel beams; and the prestressed pipeline friction loss test and calculation method is convenient and fast in test, high in efficiency, low in cost, good in economy and high in accuracy.
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Description

technical field

[0001] The invention belongs to the field of testing friction loss of prestressed concrete bridge prestressed pipeline in bridge engineering, and relates to a friction loss test and calculation method of prestressed pipeline. Background technique

[0002] At present, the methods for testing the friction loss of prestressed pipelines mainly include the strain distribution method and the tension ratio method.

[0003] 1) Strain distribution method. The strain distribution method is to paste strain gauges at different positions along the length direction of the prestressed tendons, and lead out the test wires through the holes reserved by the anchorage. By testing the strain changes of prestressed tendons along the length direction, the friction loss of prestressed pipelines at each stage is obtained, and then the relevant pipeline friction coefficients are obtained. When the strain distribution method is used to test the friction loss parameters of the prestr...

Examples

Embodiment Construction

[0052] The present invention will be further explained and described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the specific embodiments do not limit the scope of rights of the present invention.

[0053] Such as figure 1 As shown, a kind of prestressed pipe friction loss test method and calculation method provided in this specific embodiment, in actual engineering, the internal prestressed steel tendons 3 of the main bridge 1 are symmetrically distributed, and the main bridge fixed by anchors at both ends The prestressed steel beams 3 on both sides of the prestressed pipe 2 in the bridge 1 are respectively subjected to multiple asymmetric stretching and symmetrical stretching. 3 ends of the stress steel beam.

[0054] The specific test method includes the following steps:

[0055] ①The tension diagram of the prestressed steel beam 3 is attached figure 1 As shown, one end of the prestressed steel beam 3 on both side...