Highway T-beam hogging moment grouting exhaust observation pipe

Abstract

The invention discloses a highway T-beam hogging moment grouting exhaust observation pipe which is applied to a T-beam hogging moment prestressed steel strand laying duct grouting process. A T-beam comprises a bottom bent cap, beam plates erected between adjacent bent caps, grouting pipelines between the two beam plates above the same bent cap, and continuous end pouring pieces filled between twobeam plates above the same bent cap; steel strand laying hole channels are formed in the two ends of each beam plate correspondingly, and the two ends of each grouting pipeline communicate with the corresponding steel strand laying hole channels and are used for steel strand laying and grouting; and the bottom of each observation pipe is fixed to the highest point of the middle of each grouting pipeline, and the top of the observation pipe extends upwards to form a continuous end pouring piece. After the observation pipes are used, the duct grouting time of each span of bridge hogging moment steel strand is shorter than 380 min, and the grouting compactness of the pipeline grouting quality detection result can reach 95% or above.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a T-beam negative bending moment grouting exhaust observation tube for expressways. Background technique [0002] The purpose of grouting the prestressed steel strands is to prevent the corrosion of the prestressed tendons, and to transfer the prestress to the concrete structure through the condensed slurry, which generally includes the construction of cover beams and pad stones, the erection of beams and slabs, and the connection of pipes , continuous end pouring, steel strand laying and tensioning, steel strand laying channel grouting, observation and anchor sealing. When the traditional negative moment prestressed steel strand laying hole is grouted, the grout is injected from the inlet end to the end of the steel strand laying hole and flows out, which is prone to problems such as not being full and not dense at the highest point. Usually, the quality inspection r...

AI Technical Summary

Problems solved by technology

When the traditional negative moment prestressed steel strand laying hole is grouted, the grout is injected from the inlet end to the end of the steel strand laying hole and flows out, which is prone to problems such as not being full and not dense at the highest point. Usually, the quality inspection results of pipeline grouting note The density of the slurry can only reach 92.6%, so it is easy to cause problems such as corrosion of the steel strands. Once the steel strands break, the consequences will be disastrous

In addition, during traditional grouting, the end of the tunnel where the steel strand is laid is not tightly sealed, which may easily cause grout to splash, causing pollution to the structure and the environment

In addition, in the existing process, it generally takes 418 minutes to complete the bending moment grouting of each span of T-beam, which takes a long time

At present, for the optimization of pipeline grouting process, most of them start with improving the shape of steel strand laying tunnel, grouting material and grouting method. The improvement cost is high, the implementation steps are cumbersome, difficult and poor in practicability

However, some optimization schemes use secondary grouting, which requires a large investment.

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