Device for calibrating sand sample density by adopting sand rain method

Abstract

The invention discloses a device for calibrating the density of a sand sample by adopting a sand rain method, which comprises a sand storage box and a shakeout box arranged above the sand storage box,a ball valve is connected to an outlet of the shakeout box, a hose is connected to an outlet of the ball valve, and the shakeout box is connected with two vertically arranged guide rails through a sliding block I and a fixing structure thereof. The sand storage box is connected with the guide rail through a sliding block II, the sand storage box is driven by a sliding spiral transmission mechanism to move up and down, the guide rail is fixed to a panel of a main body support, the main body support is fixed to a weighbridge, the sliding spiral transmission mechanism is installed on the main body support, and a soil scraping plate is connected to the top of the sand storage box. By adopting the fixed shakeout box and the movable sand storage box and cooperating with the soil scraping plateand the lower weighbridge, the calibration work of the relation between the shakeout height and the sandy soil density can be completed accurately and rapidly, and the device is simple in structure, convenient to operate, capable of saving time and capable of improving the working efficiency.

Description

technical field [0001] The invention relates to the technical field of geotechnical tests, in particular to a device for calibrating the density of sand samples by using the sand rain method. Background technique [0002] In geotechnical model tests, the foundation preparation method and its uniformity have a direct impact on the test results. There are many sample preparation methods for sand models, such as vibration method, compaction method, plugging method, sand rain method, etc. Among them, the sand rain method is widely used in geotechnical centrifugal model tests because it can prepare sand samples with good uniformity. [0003] Before formal modeling, it is necessary to obtain the relationship between the height of sand shakeout and the density of the soil after sand shakeout. The previous method is to use a crane to hang a large funnel. A ball valve and a hose are connected to the lower part of the funnel. A regular sand storage box is placed on the ground. After...

AI Technical Summary

Problems solved by technology

However, there are many problems in this method: 1) due to the limitation of the control precision of the crane, it is difficult to keep the height between the hose outlet and the soil surface constant during the sand spreading process; 2) the operation of scraping the sand surface is relatively random; There may be sand leakage during the process of weighing on the floor scale

The existence of the above problems will lead to inaccurate test results

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