Method for repeated grouting of anchor foundation full section of power transmission line tower site group

Abstract

The invention discloses a method for repeated grouting of an anchor foundation full section of a power transmission line tower site group, comprising the steps of: firstly, arranging anchor rods in foundation pits around a grouting hole, then arranging a grouting input tube in the grouting hole, firmly sealing the mouth of the grouting hole with concrete and simultaneously and firmly sealing a grouting guide tube end socket and a grout return tube, and starting carrying out primary grouting into the grouting input tube after a concrete coagulating period; when grout return starts in the groutreturn tube in the grouting process, adding cement into a grout return pool to regulate the concentration of cement slurry when grout is diluted, controlling the concentration of the grout and closing a grout return control valve; and when the grouting pressure ceaselessly reaches a pressure value as required, stopping grouting, repeating the steps for secondary grouting after 1-2 days till the whole grouting process is completed. The movable grouting input tube can be repeatedly used in the grouting hole in a vertical moving way so as to ensure the successful performing of the repeated grouting and ensure that the grout is uniformly radiated to rock stratums around the hole through pressure, and thus, the hardness of the surrounding rock stratums and the capabilities of the anchor foundation on resisting pressure, pulling and levelness are improved.

Description

technical field [0001] The invention relates to the field of reinforcement of anchor bolt foundations in geotechnical engineering, in particular to a method for repeated grouting of full sections of anchor foundations of tower foundation groups of power transmission lines. Background technique [0002] The bolt technology and its use are relatively mature at home and abroad, and are widely used in industrial and civil buildings. Practice has proved its application value and safety and reliability. It is the first case that we apply the group anchor foundation form to the UHV transmission line tower foundation. The force of the high-voltage transmission line tower foundation is different from the characteristics of other building foundations. The foundation is not only required to bear load, but also requires a large pullout force Resistance to horizontal forces and loads caused by special natural environments. Therefore, the tower foundation not only requires a solid foundat...

AI Technical Summary

Problems solved by technology

This will not only increase the difficulty of foundation construction and increase the construction cost, but also lead to large-scale excavation and a large amount of spoil, which will cause damage to the natural environment and soil erosion

At the same time, with the increase of high-voltage and long-distance transmission lines, the construction labor conditions in mountainous areas are harsh, and it is difficult for large-scale construction machines to enter the site.

At present, traditional methods directly affect the construction progress, and it is difficult to improve the working conditions of construction personnel.

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