Device for injecting water into collapsible loess at fixed point

Abstract

The invention provides a device for injecting water into collapsible loess at a fixed point,. The device comprises an outer water injection pipe and a plurality of sections of inner water injection pipes which are radially and rotatably sleeved in the outer water injection pipe, convex teeth are arranged among the inner water injection pipes and used for delaying transmission, and the top end of the top-layer inner water injection pipe is connected with a water inlet pipe. Rotary handles are fixedly connected to the position extending out of the outer water injection pipe, of the top-layer inner water injection pipe, soil moisture sensors are arranged on the outer side wall of the outer water injection pipe along the thickness of a soil layer in an equal spacing manner, a plurality of outer water injection holes are formed in the side wall of the outer water injection pipe, and a plurality of inner water injection holes are formed in the side walls of the inner water injection pipes. The number of protruding teeth at the bottom of the inner water injection pipe is twice that of protruding teeth at the top of the next inner water injection pipe. The device disclosed by the inventionis scientific and reasonable in structural design, can achieve the purpose of directionally injecting water into different soil layers, accurately injects water into different soil layers with different moisture contents, is simple and convenient to operate and accurate to control, and can be popularized and used.

Description

technical field [0001] The invention relates to a soil water injection device for geotechnical engineering, in particular to a device for water injection at fixed points in collapsible loess. Background technique [0002] In construction engineering, when collapsible loess is encountered, foundation treatment is required, that is, to eliminate its collapsibility, according to the classification of buildings on collapsible loess sites ("Building Standards for Collapsible Loess Areas" GB50025-2018 No. 3.0 .1) and different types of buildings require different treatment depths. However, the problem often encountered in construction is that the water content of the foundation soil is low, the soil compaction cannot meet the requirements during foundation treatment, and the collapsibility coefficient after treatment cannot meet the design requirements. Clause 3, Article 7.5.3 of "Technical Specifications for Building Foundation Treatment" JGJ79-2012 requires: "When forming holes...

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Problems solved by technology

The water content of each layer of soil in the foundation soil is different. In actual operation, the total amount of water injection is easy to control, but the water injection position is not easy to control. Water injection often causes the soil layer with high water content to have higher water content and lower water content. The soil layer may still not meet the index requirements required for construction

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