On-site detecting instrument for foundation bearing capacity and filling compactness

Abstract

The invention relates to a foundation bearing capacity filling packing in-situ detector, belonging to the geotechnical engineering mechanics field. which comprises: a casing, a crossbeam, a load sensor, a transmission shaft, a sounding rod, a sounding head, a data acquisition processor, a control display panel, a communication interface and a power supply box; The invention is characterized in that: the transmission shaft, the sounding rod and the sounding head is connected with the bottom of the load sensor fixed in the inner cavity of the casing; when the sounding head is inserted into soilmass, the load sensor generates a changeable signal, the signal is sampled, amplified, calculated and displayed by the data acquisition processor, and sent to the upper machine through the communication interface for intelligentizing processing. The invention is distinguished from the penetration test apparatus, sand cone method and nucleon density apparatus used in current engineerings, can solves the following problems in existing technologies: 1, in-situ disturbing dehydration caused by drilling soil sampling, 2, radiation pollution of the nucleon density apparatus, 3, the time and labor consumed in digging pit and filling sand, 4, large error in spring force measuring element, 5, visual error in rule read value and impossibility for keeping data.

Description

Technical field: [0001] An on-site tester for foundation bearing capacity filling density involves fields such as geotechnical engineering survey, design, construction, etc. Mechanics index. Background technique: [0002] In the practice of geotechnical engineering, we often come into contact with natural foundations and artificial backfill foundations. For the evaluation of particle size, density distribution arrangement, load strength, and water content of such soils, the judgment of critical state and limit state indicators , will directly affect and control the quality of construction projects, and is a century-old plan for national capital construction. Therefore, it is very important to carry out on-site quantitative testing and qualitative analysis of the filling density of the foundation bearing capacity. [0003] Among the existing related technologies are A: "Electronic micro-penetrator" refer to Chinese patent: 88216921.1 - produced by Shenyang Institute of Autom...

AI Technical Summary

Problems solved by technology

Its shortcomings are: the error increases after the spring is fatigued, and because the probe is only 1cm long, the sounding depth is limited and cannot be tested in situ on site, and the soil sample must be taken out by drilling, which increases the disturbance and dehydration of the soil

Its shortcomings are: the visual error of the scale display itself exceeds ±5%, the error increases after the spring is used as the force measuring element, and the data disappears after the scale shrinks and cannot be retained.

Its disadvantage is: since the gamma ray source has cobalt 60 (CO 60 ) and Cesium 137 (CS 137 ) composition, radiation to the human body and pollution to the environment are well known, so its protection, radiation protection, special care, and safety facilities are very complicated

Its shortcomings: labor-intensive, time-consuming, costly and laborious

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