Bridge Grouting Anchor Head Sealing Method

Abstract

The present invention relates to a bridge grouting anchor head sealing method, which comprises the following steps: (1) During the construction of bridge prestressed cast-in-place box girders, after the steel strands are tensioned, the excess steel strands are cut off with a grinder, and The exposed length of the steel strand is 3-5cm; (2) After the PVC pipe is cut along one side of the longitudinal direction, the PVC pipe is inserted in the circumferential direction of the working anchorage, and the PVC pipe is bound with iron wires around the periphery to ensure that all The PVC pipe will not slide; (3) Fill the PVC pipe with C50 mortar to make it full, and smooth it at the mouth of the pipe; (4) Remove the PVC pipe when the strength of the mortar meets the requirements. The invention has good sealing performance and simple operation, can effectively improve the airtightness of the vacuum grouting channel, thereby ensuring that the vacuum grouting reaches the specified negative pressure, not only uses less labor force, but also saves costs, so it has good popularization and use value.

Description

technical field [0001] The invention relates to a sealing method, in particular to a sealing method for a bridge grouting anchor head. Background technique [0002] In the construction of bridge prestressed cast-in-place box girders, steel strand tension and channel grouting play an important role. After the steel strand is stretched, it is necessary to carry out the grouting construction in time. The traditional vacuum grouting anchor head sealing method is to use cement to mix into a semicircle seal. The semicircle seal often has cracks. When vacuum grouting, It is difficult to achieve the negative pressure required by the design, and occasionally the headburst phenomenon will occur due to the pressure of the grout during grouting, which will cause the grout to flow out and cause the grout in the pipeline to be not dense. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bridge grouting anchor head sealing met...

AI Technical Summary

Problems solved by technology

After the steel strand is stretched, the grouting construction must be carried out in time. The traditional vacuum grouting anchor head sealing method is to use cement to mix into a semicircle seal. The semicircle seal often has cracks. When vacuum grouting, It is difficult to achieve the negative pressure required by the design, and occasionally the headburst phenomenon will occur due to the pressure of the grout during grouting, which will cause the grout to flow out and cause the grout in the pipeline to be not dense

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