JPH0718868B2 - Soil investigation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an apparatus for soil investigation, which is important as a preliminary survey for designing the foundation of construction work or for constructing a tunnel or the like.

(Prior Art) Generally, soil investigation is performed by bowling, and a soil sample is sampled in a sampling tube as a core, and the soil is judged by visual inspection. In addition, a standard penetration test was conducted to know the N value as a relative value of the hardness and softness of soil, and the N value is 63.5 kg in weight according to Japanese Industrial Standards.
It is defined as the number of hits required to freely drop the hammer of f by 75 cm and hit the standard penetration test sampler by 30 cm. Then, the soil columnar diagram is prepared by associating the soil quality and N value obtained as data with the depth.

(Problems to be solved by the invention) Soil quality is determined by visual inspection as described above, so skillful and specialized knowledge is required, and the sample is carried from the collection site to a test room, etc. There is a problem that it takes time to get the result because it is manually evaluated. In addition, regarding the measurement of the N value, not only the equipment installed at the measurement site becomes large in size, but also noise is generated during the measurement.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a soil investigation device capable of quickly obtaining soil quality and N value data without requiring skill or specialized knowledge. .

(Means and Actions for Solving Problems) The present invention for achieving the above-mentioned object is to measure a pulling distance around a sampling tube of a sample core at a predetermined pulling distance when the sampling tube is pulled out. Withdrawal distance measuring device that outputs a signal, at the time of outputting the withdrawal distance measuring signal, with a density measuring device that outputs a density measuring signal by measuring the density of the soil inside the sampling tube, when outputting the withdrawing distance measuring signal, A chromaticity measuring instrument for measuring chromaticity of soil and outputting a chromaticity measurement signal, and a rotary penetrating rod, and at the same time as outputting the pull-out distance measuring signal, push the penetrating rod into the soil in the sampling tube, An N-value measuring device that outputs an N-value measuring signal according to the rotating torque and pushing pressure at the time is fixedly installed at a predetermined position, and further, the pull-out distance measuring signal, the density measuring signal, and the chromaticity measuring signal. , N value measurement signals are input at the same time, and the density measurement signal, the chromaticity measurement signal, and the N value measurement signal are compared with the soil density data, the chromaticity data, and the N value data that are input in advance, and The present invention is characterized in that an arithmetic processing unit for determining the N value at the same time as determining the soil type at each different depth corresponding to the pulling distance is provided.

In the present invention as described above, after the sampling tube is driven into the survey soil to a predetermined depth and the sample core is sampled, when the sampling tube is withdrawn, a withdrawal distance measuring signal is output by the withdrawal distance measuring device for each predetermined withdrawal distance. At the same time, the density, chromaticity, and N value of the soil inside the sampling tube are measured by a density measuring device, a chromaticity measuring device, and an N value measuring device that are fixed around the sampling tube, respectively. The signal, the chromaticity measurement signal, and the N value measurement signal are output, and these respective measurement signals are simultaneously input to the arithmetic processing device, and the density measurement signal, the chromaticity measurement signal, and the N value measurement signal and the soil previously input The density value, the chromaticity data, and the N value data are compared to determine the soil type at each different depth corresponding to each pulling distance, and at the same time, calculate the N value.

(Example) An example shown in the drawings will be described below.

As shown in FIGS. 1 and 2, 1 is a sampling tube, and when this tube 1 is penetrated into the ground and then withdrawn,
A soil sample core 2 is collected inside. A pull-out distance measuring device 3, a density measuring device 4, a chromaticity measuring device 5 and an N value measuring device 6 are placed around the collecting tube 1 so as not to move in the pulling-out direction of the collecting tube 1. Reference numerals 1a and 1b are grooves provided in the longitudinal direction on the peripheral wall of the tube 1, and the core 2 is measured by each measuring instrument through the grooves 1a and 1b.

The pull-out distance measuring device 3 is based on the number of rotations of the roller etc.
A measurement signal corresponding to the pulling distance of is output, and this signal is input to the computer 8 via the interface 7. A γ-ray density meter is used as the density meter 4, and
Outputs a measurement signal corresponding to the density of the cores 2 in the tube 1 as the tube 1 is pulled out, and this signal is input to the computer 8. A color TV camera is used as the chromaticity measuring device 5. This measuring device 5 identifies the chromaticity of the core 2 as the tube 1 is pulled out and outputs a measurement signal, which is input to the computer 8. It The N value measuring device 6 has a rotary penetrating rod 6a, and the penetrating rod 6a is pushed into the core 2 through the groove 1a every time the tube 1 is pulled out by a predetermined distance, and each measurement according to the rotating torque and pushing pressure at that time The signals are output and each signal is input to the computer 8.

The computer 8 stores a large amount of data of density and chromaticity regarding various soil types, and data of rotational torque and pushing pressure of the penetrating rod 6a regarding various N values beforehand.
Have been entered through. The computer 8 compares the signals output from the density measuring device 4 and the chromaticity measuring device 5 with the data input in advance regarding the soil quality, determines the soil quality corresponding to the extraction distance, and from the N value measuring device 6. The output signal is compared with the data input beforehand regarding the N value, and N corresponding to the extraction distance is compared.
Determine the value.

The soil quality and N value data corresponding to the pull-out distance, that is, the depth thus obtained are printed by the printer 9 as required, or the soil column diagram can be displayed on the display 10 based on this data. . Further, it is possible to display three-dimensionally on the display 10 on the basis of soil data obtained as described above or soil data obtained in the past at a plurality of locations.

The above embodiment is merely an example, and the present invention can be variously modified.

(Effects of the Invention) The present invention is as described above, and when the sampling tube is drawn around the sampling tube of the sample core, the drawing distance measurement signal is output for each predetermined drawing distance. And a device for outputting the withdrawal distance measurement signal,
A density measuring instrument that measures the density of the soil inside the sampling tube and outputs a density measuring signal, and a chromaticity measuring instrument that measures the chromaticity of the soil and outputs a chromaticity measuring signal when the pull-out distance measuring signal is output. N value that outputs a N value measurement signal corresponding to the rotation torque and the pushing pressure at that time when the penetration rod is pushed into the soil in the sampling tube when the pulling distance measurement signal is output. A measuring device is fixedly installed at a predetermined position, and further the drawing distance measurement signal, the density measurement signal, the chromaticity measurement signal, and the N value measurement signal are simultaneously input, and the density measurement signal, the chromaticity measurement signal, and the N value measurement are performed. The signal is compared with the soil density data, chromaticity data, and N-value data that are input in advance to determine the type of soil at each different depth corresponding to each extraction distance,
Since the arithmetic processing unit for calculating the N value is provided, the pull-out distance measured by each measuring device, the density of soil, the chromaticity, and the N value are previously input with the density data, the chromaticity data, and the N value data. By inputting to the arithmetic processing unit and comparing and calculating the two in this arithmetic processing unit, the determination of the soil type at each different depth corresponding to each withdrawal distance and the calculation of the N value can be performed quickly and accurately at the work site. Therefore, the worker is not required to perform a particularly difficult work during this time, and the work is easy, and therefore, there is an effect that a skilled and special skill or specialized knowledge is not required.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a sectional view of a collection tube. 1 ... sampling tube, 2 ... core 3 ... withdrawal distance measuring device, 4 ... density measuring device, 5 ... chromaticity measuring device, 8 ... computer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-83895 (JP, A) JP-A-59-54963 (JP, A) JP-A-60-100053 (JP, A) Actual development Sho-58- 153347 (JP, U)

Claims (1)

[Claims] 1. A pull-out distance measuring device which outputs a pull-out distance measuring signal for each predetermined pull-out distance around the pull-out tube of the sample core, when the pull-out distance measuring signal is output. , A density measuring device that measures the density of the soil inside the sampling tube and outputs a density measurement signal, and a chromaticity measurement that also measures the chromaticity of the soil and outputs a chromaticity measurement signal when the pull-out distance measurement signal is output. And a rotary penetrating rod, also when the pull-out distance measurement signal is output, push the penetrating rod into the soil in the sampling tube,
An N-value measuring device that outputs an N-value measuring signal corresponding to the rotating torque and pushing pressure at that time is fixedly installed at a predetermined position, and further, the pull-out distance measuring signal, the density measuring signal, the chromaticity measuring signal, and the N value. The measurement signals are input at the same time, and the density measurement signal, chromaticity measurement signal, and N value measurement signal are compared with the soil density data, chromaticity data, and N value data that have been input in advance to determine the pull-out distance. A soil investigation device, characterized in that it is provided with an arithmetic processing unit for calculating the N value at the same time as determining the type of soil at each corresponding different depth.