CN208520669U - A kind of measurement frozen soil sample unfrozen water content and can melt the device of soil sample water content - Google Patents

Abstract

The utility model relates to a device for measuring the unfrozen water content of a frozen soil sample and the water content of a thawed soil sample. connected to the real instrument. The joint seam of the two pairs of half-type cylinders is grooved, and a sealing rubber strip is embedded in the groove. The wall of the sample preparation cylinder is thin at the top and thick at the bottom, and the outer wall is not perpendicular to the bottom plate. The inner wall has recessed notches. There are grooves on the inner wall of the sample preparation cylinder. The flexible circuit board is fixed in the groove on the inner wall of the sample preparation cylinder by 3M glue. The two pieces of flexible circuit boards on the inner wall of the sample preparation cylinder form a capacitor, and the flexible circuit board is connected to the power supply and signal through wires. Processing module and data acquisition instrument. Compared with the drying method, the utility model is quick and convenient to use, reduces the uncertainty of the test data caused by the volatilization of water during the complicated operation steps of the long drying method, and greatly improves the measurement accuracy.

Description

A kind of measurement frozen soil sample unfrozen water content and can melt the device of soil sample water content

Technical field

The utility model relates to a kind of measurement frozen soil sample unfrozen water content and melt the device of soil sample water content, which can be with The volumetric(al) moisture content for carrying out soil sample is just measured while sample preparation, according to the density of sample preparation, also obtains the mass water content of soil sample finally, The unfrozen water content of frozen soil can also be measured immediately.

Background technique

Soil is widely distributed in the topmost of the earth's crust, is the main object of human engineering and economic activity.The engineering geology of soil Property is very different, for example, what is had builds high buildings and large mansions, and some Lianping rooms, which are all held, dares not accept as building lot.Therefore, just The engineering properties for really evaluating and findding out soil, provides reliable foundation and parameter for the design and construction of building lot, for ground It is vital and soil test purpose for engineering.Soil test is important as soil science and soil mechanics Component part is physico-hydrology, the physical mechanics, physicochemical characteristics that soil is evaluated by designing a series of means of testing 's.Soil physical properties, such as structural, plasticity, compressibility, adherence, caking property, all with the close phase of soil water regime It closes.The soil water is not only the emphasis or the hydrology, meteorology, hydrogeology, irrigation and water conservancy, nature of domestic and international soil physics research The important research content of the subjects such as geographical and plant physiology.The occurrence status of water content and water in frozen soil directly affects frozen soil Physical property and engineering characteristic, the heat exchange conditions and hydro-thermal transportational process, frozen soil of water content of soil and frozen soil and external environment The important cyopedology project such as coupled heat-moisture-stress process is closely related, is to influence the characteristics such as frozen soil strength, rheology, frost heave, thaw collapse When key factor.The occurrence status variation of water not only influences native aqueous systems heat balance in frozen soil, but also influences frozen soil The variation of physical property.Unfrozen water content in frozen soil is not only the important indicator of evaluation water translocation feature, and is also heat Essential parameter in stream calculation, thus in frozen soil total moisture content and unfrozen water content measurement it is extremely important.

Measurement soil sample water content, the measurement of current existing soil moisture content are generally required in soil and cyopedology The advantages of there are many method, are substantially are measured using oven drying method at present, oven drying method are precision height, but its process is many and diverse, time-consuming, The undisturbed initial water content that especially field acquisition is arrived measures more difficult.The dielectric constant of water is about 81, and ice is opposite Dielectric constant is 3.2, suitable with dry ground particle dielectric constant (3-5).Therefore, frozen soil is tested using dielectric property do not freeze water contain Measuring and melting native water content is a kind of fit closely method.Compared with other measuring technology means, the advantage of dielectric property technology Measuring accuracy height is shown, in volumetric(al) moisture content error in soil testing between 1%-2%；Time and spatial resolution are high, survey Try simple and fast, can be used for field test, continuous uninterrupted test can be realized by automation and multi-channel mode, to frozen soil and Agrology research and engineer application are of great significance.

Summary of the invention

In view of above-mentioned, the purpose of the utility model is to provide a kind of measurement frozen soil sample unfrozen water content and to melt soil sample aqueous The device of amount.The device is not destroying the complete of soil sample using the principle of Method of Dielectric Coefficient measured moisture content with unique frame mode Whole property tests content of unfrozen water in frozen earth and to melt native water content simple and fast, and there is performance to stablize, the high feature of measuring accuracy. Frozen soil sample unfrozen water content can be conveniently measured in sample making course and melts the volumetric(al) moisture content of soil sample.

Purpose of the utility model is realized as follows:

A kind of measurement frozen soil sample unfrozen water content and can melt the device of soil sample water content, mainly by cushion block, sample preparation cylinder, soft Property circuit board, garter spring, signal processing module and data acquisition module composition.Sample preparation cylinder is two half-and-half type arcuate cylinders, and soil sample is set In two half-and-half type arcuate cylinders, sample preparation cylinder bottom has cushion block and flange, and flange is connected with sampling machine or size automatic firmness-impacting apparatus, and two A sample preparation cylinder arcuate cylinder piece bonding crack is in groove, and groove is embedded with sealing rubber strip；Garter spring inner wall has recess to be embedded in rubber strip, system Sample barrel upper-thin-lower-thick, outer wall are not orthogonal to bottom plate, and garter spring is inserted in two half-and-half type arcuate cylinders, and two half-and-half type arcuate cylinders are tight Hoop, the flexible circuit board of sample preparation cylinder inner wall are fixed on groove, flexible circuit board are fixed on the recessed of sample preparation cylinder inner wall using 3M glue In slot, the flexible circuit board of two panels sample preparation cylinder inner wall forms a capacitor, capacitance with the change of moisture content of soil sample in cylinder and Variation；Flexible circuit board accesses power supply and signal processing module by conducting wire, and processed signal is 4 ~ 20mA standard direct current Signal is flowed, which is accessed into data acquisition module automatic data collection.

The advantages of the utility model and beneficial effect are:

1, when measuring the volumetric(al) moisture content for melting soil sample, it can directly melt soil and not freeze sample preparation cylinder sample preparation.It can made using device The water content that soil sample is measured while sample, greatlys improve working efficiency；

2, the present apparatus can be used for the water content of field undisturbed and the unfrozen water content measurement of frozen soil undisturbed, improve field Accuracy and the working efficiency for measuring the water content of undisturbed, reduce many and diverse degree of field measurement.

3, the present apparatus can measure simultaneously the water content of soil sample both with sample preparation, the good frozen soil sample of constant temperature can also be put into sample preparation bucket Interior, the unfrozen water content of measuring frozen is widely used in soil test；Loading method can be free, and versatility is good；

4, the present apparatus can automatic data collection, reduce oven drying method multi-step manual measurement and recording error, use quick side Just, and reduce moisture evaporation between many and diverse operating procedure of too long oven drying method, cause the uncertainty of test data, greatly improve Measurement accuracy.

5, flexible circuit board used by the utility model is using polyimides or polyester film as one kind made of substrate With height reliability, excellent flexible printed circuit has the characteristics that Distribution density is high, light-weight, thickness is thin.

Detailed description of the invention

Fig. 1 is the utility model sample preparation cylinder schematic diagram；

Fig. 2 is the utility model structure diagram；

Fig. 3 is variation and the soil sample change of moisture content schematic diagram of capacitance.

Specific embodiment

The technical solution of the utility model is described further again with reference to the accompanying drawing:

As shown in Figs. 1-2, a kind of measurement frozen soil sample unfrozen water content and can melt the device of soil sample water content, mainly by padding Block 1, sample preparation cylinder 2, flexible circuit board 3,5 signal processing module 8 of garter spring and data acquisition module 9 form.Sample preparation cylinder 2 is two double Formula arcuate cylinder, for making soil sample 7.Two half-and-half type arcuate bottom of cylinder are equipped with cushion block 1 and flange, and flange is in sample making course What be can be convenient is connected using bolt 6 with sampling machine or size automatic firmness-impacting apparatus.Two half-and-half type arcuate cylinder piece bonding cracks are in groove, interior Embedded with sealing rubber strip 10,5 inner wall of garter spring has recess to be embedded in rubber strip 10.2 barrel upper-thin-lower-thick of sample preparation cylinder, outer wall are not orthogonal to Bottom plate, such garter spring 5 easily can tightly fit together two half-and-half type arcuate cylinder pieces, and be easy to dismantle.Sample preparation 2 inner walls of cylinder are fluted, flexible circuit board 3 are fixed in 2 inboard wall groove of sample preparation cylinder using fixation dedicated 3M glue, two panels sample preparation cylinder The flexible circuit board 3 of 2 inner walls forms a capacitor.Dielectric constant is also known as capacitivity or relative permitivity, be characterization dielectric or One significant data of insulating materials electrical property, commonly using ε indicates.It refers to that in same capacitor be dielectric with same substance With the ratio of capacitor when vacuum, indicate that dielectric stores the relative ability of electrostatic energy in the electric field.Due to 2 internal diameter one of sample preparation cylinder Fixed (for standard soil sample diameter 61.8mm), thus the capacitance of capacitor composed by flexible circuit board 3 in a vacuum be it is certain, because This, the dielectric constant between flexible circuit board 3 depends on soil sample 7.Soil sample 7 serves as dielectric, and dielectric constant is with flexible circuit board 3 Between soil sample 7 capacitance variations and change, 7 change of moisture content of soil sample can be converted to the variation of capacitance.And capacitance is big It is small depending on 7 interior liquid water of soil sample number.The variation of capacitance and soil sample change of moisture content are as shown in Figure 3.By sample preparation bucket 2 On flexible circuit board 3 be connected with conducting wire with signal processing module 8, data acquisition module 9.The function of signal processing module 8 It is that capacitance signal is converted into 4-20mA standard current signal, to facilitate data collecting instrument 9 to acquire data.Melt soil when to measure Unfrozen water content will can directly melt soil sample and place in sample preparation cylinder 2.Standard current signal is converted into aqueous by data acquisition module 9 Digital signal is measured, data collecting instrument has small liquid crystal display, can melt the volumetric(al) moisture content of soil sample 7 in the surveyed sample preparation cylinder 2 of real-time display. When measuring the unfrozen water content of frozen soil sample, frozen soil sample 7 is directly put into sample preparation bucket 2, frozen soil sample 7 can have both been measured and does not freeze water and contain Amount.

Claims (1)

1. a kind of measurement frozen soil sample unfrozen water content and can melt the device of soil sample water content, mainly by cushion block (1), sample preparation cylinder (2), flexible circuit board (3), garter spring (5), signal processing module (8) and data acquisition module (9) composition, sample preparation cylinder (2) are two Half-and-half type arcuate cylinder, soil sample (7) are placed in two half-and-half type arcuate cylinders, and sample preparation cylinder (2) bottom has cushion block (1) and flange, Flange is connected with sampling machine or size automatic firmness-impacting apparatus, and two sample preparation cylinder (2) arcuate cylinder piece bonding cracks are in groove, and groove is embedded with sealing Rubber strip (10)；Garter spring (5) inner wall has recess to be embedded in rubber strip (10), sample preparation cylinder (2) wall upper-thin-lower-thick, and outer wall is not orthogonal to bottom Plate, garter spring (5) are inserted in two half-and-half type arcuate cylinders, by two half-and-half type arcuate cylinder lock rings, the flexible circuit of sample preparation cylinder (2) inner wall Flexible circuit board (3) is fixed in the groove of sample preparation cylinder (2) inner wall by plate fixed groove using 3M glue, in two panels sample preparation cylinder (2) The flexible circuit board (3) of wall forms a capacitor, and capacitance changes with the change of moisture content of soil sample in cylinder (7)；Flexible electrical For road plate (3) by conducting wire (4) access power supply and signal processing module (8), processed signal is 4 ~ 20mA standard DC current The signal is accessed data acquisition module (9) automatic data collection by signal.