Post-tensioning prestressed box girder double-duct type vacuum-assisted mud jacking system and construction method thereof

Abstract

The invention discloses a post-tensioning prestressed box girder double-duct type vacuum-assisted mud jacking system and a construction method thereof. A sealing assembly seals the two ends of two prestressed reinforcement ducts respectively, the two ends of a communicating pipe are in sealed connection with the tail ends of the two prestressed reinforcement ducts respectively, and a vacuum degreemeasuring piece is used for measuring the vacuum degree of the prestressed reinforcement ducts; an vacuum-assisted mud jacking machine comprises a mud stirring bin provided with a mud inlet and a stirring mechanism, a mud jacking pump with the inlet connected with the mud stirring bin, a waste mud bin provided with a pressure release valve, a negative pressure bin, and a vacuum pump with the inlet connected with the negative pressure bin. The outlet of the mud jacking pump is divided into two paths, one path is in sealed connection with one prestressed reinforcement hole channel through a mudjacking pipe with a first valve, the other path is communicated with the waste mud bin through a pipeline with a second valve, and the waste mud bin is in sealed connection with the head end of the other prestressed reinforcement hole channel through a vacuum pipe with a third valve. The negative pressure bin is communicated with the waste mud bin through a pipeline with a fourth valve. Double-hole-channel one-time grouting can be achieved, and operation is convenient and fast.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a post-tensioned prestressed box girder double-channel vacuum-assisted grouting system and a construction method. Background technique [0002] After the post-tensioned prestressed box girder is poured, the prestressed reinforcement channels and prestressed steel bars will be left, and the prestressed reinforcement channels need to be filled by vacuum-assisted grouting. However, the current vacuum-assisted grouting technology has the following problems: 1) The grouting pump The vacuum equipment and the vacuum equipment are arranged at both ends of the prestressed steel tunnel respectively. The operation and layout are cumbersome, the grouting quality is not easy to control, and the labor cost is high; 2) The prestressed steel tunnel needs to be grouted one by one, and the construction period is slow; 3) The sealing effect Poor, can not prestress the complete va...

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Problems solved by technology

[0002] After the post-tensioned prestressed box girder is poured, the prestressed reinforcement channels and prestressed steel bars will be left, and the prestressed reinforcement channels need to be filled by vacuum-assisted grouting. However, the current vacuum-assisted grouting technology has the following problems: 1) The grouting pump The vacuum equipment and the vacuum equipment are arranged at both ends of the prestressed steel tunnel respectively. The operation and layout are cumbersome, the grouting quality is not easy to control, and the labor cost is high; 2) The prestressed steel tunnel needs to be grouted one by one, and the construction period is slow; 3) The sealing effect Poor, can not prestress the complete vacuum state of the steel channel, affecting the grouting quality and compactness

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