JP3705538B2 - Soil evaluation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soil quality evaluation apparatus such as embankments and cuts in tunnel excavation or light construction, landfill, improved ground, etc., and more particularly to a soil quality evaluation apparatus for unconsolidated ground.
[0002]
[Prior art]
Conventionally, with regard to the soil quality evaluation of the face in tunnel excavation, it is possible to directly evaluate the hard rock ground by visual observation, hammering, and various investigation equipment, but in the so-called unconsolidated ground excavation work, the face is independent. In many cases, sprayed concrete was constructed at the same time as excavation, and in general, no soil survey was conducted on the face.
In addition, in the basic excavation management in light construction such as dams, control values are often set by flat plate loading test or standard penetration test, but it takes a lot of labor and time depending on the test quantity.
[0003]
In tunnel excavation by a shield machine, for example, in Japanese Patent Publication No. 3-44197, Japanese Patent Laid-Open No. 62-164997, and Japanese Patent Laid-Open No. 1-94196, a rod disposed in the shield machine is used as a front face. A technique for penetrating and measuring soil properties is disclosed.
However, these techniques are not capable of quickly, safely and economically assessing the condition of the face in unconsolidated ground excavation.
[0004]
[Problems to be solved by the invention]
Generally, in civil engineering, especially in the tunnel field, judgment based on experience often occupies a large weight, and therefore, obtaining objective and quantitative judgment information is required.
However, it is difficult to work close to the face of an unconsolidated mountain, and it is difficult to make a quantitative evaluation using various measuring instruments.
In addition, as described above, the plate loading test and the standard penetration test in the light work require separate labor and time for carrying in the test equipment. The development of a law is desired.
[0005]
Therefore, the present invention addresses the above-mentioned problems, and can evaluate a ground condition quickly, safely and economically in excavation work, embankment, ground improvement work, etc. of unconsolidated ground. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In the present invention, a cylindrical sliding body (6) driven by a hydraulic cylinder (5) is slidably fitted into a casing (1), and is provided on a head (6a) of the cylindrical sliding body (6). The load cell (7) is engaged with the rear end portion of the center rod (4a) having the tip cone (3) at the front end portion, and the rear end portion of the sleeve tube (4b) surrounding the center rod (4a) is cylindrically slid. The moving body (6) is fixed to the head (6a) and the casing (1) is provided with the displacement sensor (8) of the tip cone (3) to constitute the cone penetrating means (10). The cone penetrating means (10) Is attached to the heavy construction machine (M) and the hydraulic cylinder (5) is driven by the hydraulic device of the heavy equipment, and the central rod (6) is driven through the cylindrical sliding body (6) by the driving force of the hydraulic cylinder (5). 4a) and the sleeve tube (4b) penetrate into the ground, and the load cell (7) and the displacement sensor (8) The penetration resistance and penetration amount of the tip cone (3) are detected.
[0007]
As the means for detecting the penetration resistance, a load cell or a hydraulic sensor is preferable. As the means for detecting the penetration amount, a displacement sensor or an oil amount is preferably detected and converted.
[0008]
According to the present invention, the cone penetrating means is applied to the face or the ground by a general-purpose heavy machine at an arbitrary angle, and the hydraulic cylinder is driven by the hydraulic device of the heavy construction machine so that the tip cone of the penetrating rod penetrates the face or the ground. Then, the penetration resistance and penetration amount of the tip cone are continuously measured by the detection means, and the soil quality such as the face and the ground is evaluated.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a penetration device 10 which is a cone penetration means. The penetrating device 10 has a cylindrical casing 1, and a cylindrical sliding body 6 is inserted into the casing 1 so as to be slidable in the longitudinal direction by driving of the hydraulic cylinder 5. A load cell 7 for detecting penetration resistance is provided on the head 6a. A tip cone 3 is provided at the tip of the center rod 4 a, and the rear end of the center rod 4 a is engaged with the load cell 7. A sleeve tube 4b is provided so as to surround the central rod 4a, and a rear end portion of the sleeve tube 4b is fixed to a head portion 6a of the cylindrical sliding body 6. The double tube rod 4 is constituted by the center rod 4a and the sleeve tube 4b, and the penetrating rod 2 is constituted by the double tube rod 4 and the tip cone 3. A displacement sensor 8 that detects the amount of movement of the penetrating rod 2, that is, the tip cone 3, is provided at the rear end of the casing 1.
[0010]
The penetration device 10 is detachably attached to a general purpose heavy machine generally used at an excavation site as shown in FIG. 2, for example, the side of the bucket arm A of the hydraulic excavator M, etc. The hydraulic cylinder 5 to be driven is supplied with pressure oil using a hydraulic device (not shown) of the excavator M as a hydraulic source.
The hydraulic power source is preferably provided with a flow control valve (not shown) in order to control the penetration speed.
[0011]
As shown in FIG. 2, the measurement for soil evaluation is performed by pressing the bottom surface of the bucket B of the excavator M against a face or the ground (indicated by E) and driving the hydraulic cylinder 5 with the arm A fixed. Insert the tip cone 3 into the face or ground. At this time, the penetration speed is suitably about 1 cm / s. The load cell 7 and the displacement sensor 8 continuously measure the penetration input and the penetration amount, and record it in a recording device (not shown) to evaluate the soil quality. .
Since the penetrating rod 2 is a double tube type, the frictional resistance force of the rod is removed, and only the penetration resistance force of the cone 3 is loaded on the load cell 7 and measured.
[0012]
FIG. 3 and FIG. 4 show an embodiment for a natural ground and embankment, and both the penetration amount (stroke mm) is taken on the horizontal axis and the penetration input (kN) is taken on the vertical axis.
FIG. 3 shows two examples of natural ground 1 and embankment 1, and FIG. 4 shows two measurement examples of natural ground 2, 3 and embankment 2, 3, and the soil quality can be evaluated from these results.
[0013]
In the soil evaluation, N and qc values are adopted in the design as quantitative indexes in soil engineering. However, in the present invention, an index corresponding to the qc value can be obtained, and the face like the normal ground evaluation can be obtained. And physical properties such as ground.
[0014]
【The invention's effect】
The present invention is configured as described above, and the following effects are obtained.
(1) It is possible to evaluate soil quality such as face and ground by making effective use of general-purpose heavy machinery permanently installed at the site.
(2) The measurement is a work with heavy machinery, and it is safe because it is not necessary for the worker to approach the face or slope in tunnel excavation.
(3) Soil quality is evaluated by obtaining indices recognized in geotechnical engineering.
(4) A recording device or a recording medium can be used for measurement data, and rapid processing is possible.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a cone penetration means according to the present invention.
FIG. 2 is a diagram showing a measurement situation by the soil quality evaluation apparatus of the present invention.
FIG. 3 is a diagram illustrating an example of a measured value of a penetration input.
FIG. 4 is a diagram showing another example of measured values of the penetration input.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Penetrating stick 3 ... Tip cone 4 ... Double pipe rod 5 ... Hydraulic cylinder 6 ... Cylindrical sliding body 7 ... Load cell 8 ... Displacement sensor 10 ... Cone penetration means M ... General purpose heavy machinery

Claims (1)

  A cylindrical sliding body (6) driven by a hydraulic cylinder (5) is slidably fitted into the casing (1), and a load cell (7) provided on the head (6a) of the cylindrical sliding body (6). ) Is engaged with the rear end portion of the center rod (4a) having the tip cone (3) at the front end portion, and the rear end portion of the sleeve tube (4b) surrounding the center rod (4a) is connected to the cylindrical sliding body (6). The displacement sensor (8) of the tip cone (3) is provided on the casing (1) to constitute the cone penetration means (10), and the cone penetration means (10) is connected to a heavy construction machine ( M) and the hydraulic cylinder (5) is driven by the hydraulic device of the heavy machinery, and the central rod (4a) and the sleeve are driven via the cylindrical sliding body (6) by the driving force of the hydraulic cylinder (5). The pipe (4b) penetrates the ground, and the tip coat is applied by the load cell (7) and the displacement sensor (8). A soil quality evaluation apparatus characterized in that the penetration resistance and penetration amount of the slab (3) are detected.

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