Bottom grout injection system and method suitable for deep well grounding electrode feed bar

Abstract

The invention relates to a bottom grout injection system suitable for a deep well grounding electrode feed bar. The grout injection system comprises a bottom steel column, an inner layer floral tube,an outer layer floral tube, a grout injection inserting base, a one-way valve, a centralizer containing plug, a grout injection pipe and a steel casing pipe; when the grout injection system starts grout injection, through the pressure of the centralizer containing plug, the one-way valve is started, water on the outer pipe of the steel casing pipe is supplemented into the steel casing pipe in time, and the phenomenon that when the feed bar is drained to the ground, due to temperature rise, water is evaporated, and a feed system fails is avoided.

Description

technical field [0001] The invention relates to the technical field of DC transmission engineering grounding, in particular to a bottom grouting system and a grouting method suitable for deep well grounding electrode feed rods. Background technique [0002] As an important part of the DC transmission project, the DC grounding electrode is now commonly used in two types of land grounding electrode technology: horizontal grounding electrode and vertical grounding electrode. The existing grounding electrodes have disadvantages such as large floor area, difficult site selection, and great impact on the shallow environment around the electrode site. The deep well grounding electrode technology can effectively avoid the above-mentioned problems. After the deep well drilling is completed, in order to install the follow-up equipment smoothly, it is necessary to lower the protective wall steel casing first, and then lower the drainage and feeder rods. In order to increase the connect...

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Problems solved by technology

[0003] Coke particles are an important part of grounding electrodes. In the construction of conventional horizontal and vertical grounding electrodes, direct landfilling is often used. However, deep well grounding electrodes have small apertures, large buried depths, and many equipments, so direct landfilling cannot be adopted. Therefore, it is considered to use the method of grouting at the bottom of the hole for filling. The grouting at the bottom of the hole is widely used in oil, natural gas, geothermal and other exploration and production processes, but it is mostly used in the cementing process. big difference

[0004] The existing bottom grouting equipment does not consider the construction procedure and electrical equipment installation requirements of the deep well ground electrode. There is a big difference between the cementing and one-way grouting process and the deep well ground electrode coke filling process. It is necessary to consider the existing feeder in the deep well. In the case of electric rods, it is of great significance to design a grouting equipment that can fill the coke slurry completely and quickly in the diffuse flow section after bottom grouting. It is of great significance to break through engineering problems for the installation of deep well ground electrodes.

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