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Stretch-drawing method for prestressed ribs of concrete bridge

A technology of prestressed tendons and concrete, which is applied in the direction of construction, building structure, and building material processing, etc., and can solve problems such as complex construction technology, large channel friction loss, and high quality requirements

Inactive Publication Date: 2009-07-08
THE SECOND OF CHINA RAILWAY PORT CHANNEL ENG GROUP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, its construction process is complex and requires high quality. For long prestressed tendons, the channel friction loss is relatively large, and the elongation and effective prestress often fail to meet the design and specification requirements.
At present, the prestressed stretching method of ordinary prestressed concrete mostly adopts one-end stretching method, and usually only one stretching method is used. For bridge prestressed concrete with long prestressed tendon length, the stretching The length and effective prestress often fail to meet the design requirements

Method used

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Experimental program
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Effect test

Embodiment

[0020] A kind of concrete bridge prestressed tendon stretching method of the present embodiment comprises the following steps successively:

[0021] A. Determine the initial stress and tension according to the design requirements, and install jacks at both ends of the prestressed tendons;

[0022] B. Jacks are loaded in stages to stretch the prestressed tendons;

[0023] C. After the load reaches the design tension, hold the load for 5 to 30 minutes, return oil, self-anchor, back off the top, and complete the first tension;

[0024] D. Park for 5-10 days;

[0025] E. Repeat steps B and C to complete the second tension.

[0026] Among them, the graded loading is divided into 5 grades of loading, that is, 0.2 times, 0.4 times, 0.6 times, 0.8 times and 1 times the design tension.

[0027] When performing each level of loading and tensioning, determine whether the level of loading and tensioning meets the design requirements by measuring the elongation of the prestressed tendon...

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PUM

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Abstract

The invention discloses a method for tensioning a prestressed reinforcing rib of a concrete bridge, which comprises the following steps: A, determining primary stress and tensioning force according to the design requirement, and mounting a jack on two ends of the prestressed reinforcing rib; B, loading the jacks in stages to tension the prestressed reinforcing rib; C, when the loading reaches the designed tensioning force, holding the force for 5 to 30 minutes, returning oil, anchoring automatically, and moving back from the top to finish the tensioning for the first time; D, placing the prestressed reinforcing steel for 5 to 10 days; and E, repeating the steps B and C to finish the tensioning for the second time. The method for tensioning the prestressed reinforcing steel of the concrete bridge tensions two ends of the prestressed reinforcing rib and performs the tensioning for the second time so as to better ensure that the elongation and the effective prestressing of the prestressed reinforcing rib after the tensioning reaches the design requirements.

Description

technical field [0001] The invention relates to bridge beam section prefabrication technology, in particular to a method for stretching prestressed tendons of concrete bridges. Background technique [0002] Prestressed concrete is widely used in various projects because of its good crack resistance, high rigidity, saving materials, reducing self-weight, improving the shear resistance and fatigue resistance of components, and improving the stability of compression components. . However, its construction process is complex and requires high quality. For long prestressed tendons, the channel friction loss is relatively large, and the elongation and effective prestress often fail to meet the design and specification requirements. At present, the prestressed stretching method of ordinary prestressed concrete mostly adopts one-end stretching method, and usually only one stretching method is used. For prestressed concrete bridges with long prestressed tendons, the stretching metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/12
Inventor 陶建山王吉侠叶李张启桥
Owner THE SECOND OF CHINA RAILWAY PORT CHANNEL ENG GROUP
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