High-position beam falling construction method in box beam erection

A construction method and box girder technology, applied in the erection/assembly of bridges, bridge construction, bridges, etc., can solve the problems of idle equipment in the field, prolong the construction period, and increase the construction cost, so as to avoid idle equipment, save construction period, The effect of low construction cost

Active Publication Date: 2016-11-09
中铁十七局集团第三工程有限公司
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Problems solved by technology

In this way, the construction period will be extended, and the problems of idle equipment and personnel on the site will be caused, and the construction cost will be increased.

Method used

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  • High-position beam falling construction method in box beam erection
  • High-position beam falling construction method in box beam erection
  • High-position beam falling construction method in box beam erection

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] In the present invention, the box girder to be erected is aligned by the bridge erecting machine and the beam transport vehicle, the bridge erecting machine is returned, and then four 500T jacks are used to raise the top of the box girder to 420mm higher than the design elevation, and the four jacks are withdrawn after the alignment of the bottom of the beam is completed. (If you wait for the stretching time of the continuous beam within 7 days, the jack will not be withdrawn), carry out the stretching of the longitudinal prestressed beam of the continuous beam. position, carry out support mortar pouring. In the process of high-level storage, jacking and beam drop of the box girder, measures are taken to temporarily fix the expansion joints at four positions on both sides to prevent the box girder from sliding vertically and ho...

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Abstract

The invention discloses a high-position beam falling construction method in box beam erection, and belongs to the technical field of bridge construction. The construction method includes the following steps that concrete pouring is carried out on a pier cap for the first time, and box beam storing and jacking conditions and jack operation conditions in the beam falling process are met; the box beam is erected to the designed position, and supporting base mortar is not poured; the box beam is jacked, a crane sling of a bridge girder erection machine is not disassembled first, and box jacking and beam falling exercise simulation is carried out on a jack assisted by the bridge girder erection machine; the bridge girder erection machine returns to a beam field, the box beam is jacked to be higher than the design elevation by 420 mm, and a steel plate layer is arranged on four points to support the bottom of the box beam; a continuous beam longitudinal stress tendon is tensioned; the beam falls from the high position to the designed position, and the supporting base mortar is poured; concrete pouring is carried out on the pier cap for the second time. The high-position beam falling construction method is easy to operate and capable of shortening construction period and reducing construction cost, and construction is convenient.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for high-level falling beams in the erection of box girders. Background technique [0002] In the construction of high-speed railway box girder erection, due to the tight construction schedule and complex construction techniques such as continuous beams, cast-in-place beams, and basket arches, it is often encountered that the bridge erecting machine is erected to the continuous beams, but the continuous beams do not meet the tension conditions. At this time, the bridge erecting machine cannot pass through, and the bridge erecting machine needs to return to the end of the bridge, wait for the continuous girders to close and stretch the girder, or the bridge erecting machine turns around and erects another direction before returning to erect the girder. In this way, the construction period will be extended, and the problems of idle equi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 閤鹏魏文柱乐锋郭宏坤张生全
Owner 中铁十七局集团第三工程有限公司
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