Construction method for penetrating through full-length prestressed tendon of segmental prefabricated assembled beam

A prestressed beam, prefabricated assembly technology, applied in the erection/assembly of bridges, bridges, bridge construction, etc., can solve the problems of affecting the prestressed elongation value, low construction work efficiency, large construction resistance, etc., to reduce construction costs and improve. The effect of improving construction quality and construction efficiency

Inactive Publication Date: 2020-08-28
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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Problems solved by technology

[0003] Disadvantage: When the prestressed beam is short, the construction efficiency is acceptable; but for the tunnel with long prestressed beam and the prestressed design line shape is changeable, when the prestressed beam is threaded after the completion of the box girder construction, the bea

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  • Construction method for penetrating through full-length prestressed tendon of segmental prefabricated assembled beam
  • Construction method for penetrating through full-length prestressed tendon of segmental prefabricated assembled beam
  • Construction method for penetrating through full-length prestressed tendon of segmental prefabricated assembled beam

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Embodiment Construction

[0032] The present invention is described in further detail below by embodiment, and embodiment is only used for illustrating the present invention, does not limit the scope of the present invention.

[0033] see Figure 1-10 A construction method for segmentally prefabricated assembled girder through-length prestressed beams shown includes the following steps:

[0034] (1) First cut a steel strand 1 that is about 3 meters longer than the designed full-length prestressed beam length (so that it is convenient to operate), the steel strand 1 is a single piece, and is used for trying on. An annulus 2 (the diameter of the annulus 2 is the same as the diameter of the steel strand bundle 3 to be worn) made of light round steel bars is fixed at the end of the steel strand 1 by electric welding;

[0035] (2) The operator holds the other end of the steel strand 1, that is, the end of the unwelded ring 2, and passes the steel strand 1 into one end of the prestressed tunnel to be penetr...

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Abstract

The invention relates to a box girder pre-stressed tendon penetrating construction method of a post-tensioning method in the field of infrastructures, in particular to a segment prefabricated assembled beam full-length pre-stressed tendon penetrating construction method and a penetrating construction method with variable pre-stressed design lines. One end of a single steel strand is welded with acircular ring with the same diameter as a steel strand bundle in advance for trying to penetrate the hole channel, so that factors influencing bundle penetration are processed in advance, and the whole bundle is prevented from penetrating in and exiting to delay the construction progress; the total number of prestress is designed in a duct in advance, the prestress is bundled and integrally arranged in a penetrating mode according to numbers, the steel strand winding phenomenon is avoided, the prestress tensioning quality is guaranteed, and the construction quality is improved; the winch is used for pulling, labor is saved, the construction progress is accelerated, and the construction cost is reduced; especially, for a multi-connected continuous box girder, two winches are adopted for alternate strand pulling, and the strand pulling construction efficiency is remarkably improved.

Description

technical field [0001] The invention relates to a post-tensioning method for post-tensioning box girder prestressed beam threading construction method in the field of infrastructure, in particular to a segmental prefabricated assembled beam through-length prestressed beam threading construction method. Background technique [0002] The post-tensioned prestressed box girder prestressed beam threading is cut by a cutting machine according to the design length, and then the beam is threaded manually or by a small beam threading machine. The cumulative number of beams is consistent with the number of single beam design beams; [0003] Disadvantages: When the prestressed beam is short, the construction efficiency is acceptable; however, for the channel with long prestressed beam and variable prestressed design line shape, when the prestressed beam is threaded after the completion of the box girder construction, the beam threading is completed. Before the total number of roots is ...

Claims

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Application Information

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IPC IPC(8): E01D21/00E01D21/10E01D2/04
CPCE01D2/04E01D21/00E01D21/10
Inventor 王宝兵张清超韩亚军来克冬陈东辉聂鹏辉
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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