JP2002004259A - Soil evaluation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil evaluation device capable of evaluating rapidly, safely, and ecomincally conditions of cutting faces, ground, etc., in an excavation work of unsolidified ground, an embankment, a ground improving work, etc. SOLUTION: A cone penetration means (10) is constituted of a penetration bar (2) formed of a cone tip (3) and a double tube rod (4) and a hydraulic cylinder (5) by which the penetration bar (2) is forced to penetrate into a cutting face or a ground. The cone penetration means (10) is attached to a construction machine ordinarily used in an excavating site and the hydraulic cylinder (5) of the cone penetration means (10) is driven by the hydraulic device of the construction machine (M) and means (7, 8) for detecting a penetration resistance of the penetration bar (2) and a penetration depth are provided in the cone penetration means (10).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for evaluating soil quality, for example, for cutting face in tunnel excavation or embankment or cut in landfill work, landfill ground, and improved ground.
In particular, the present invention relates to a soil evaluation device for unconsolidated ground.

[0002]

2. Description of the Related Art Conventionally, with respect to the evaluation of the soil quality of a face in tunnel excavation, a method of directly observing a hard rock ground by a visual observation, a hammer strike, and various kinds of investigation equipment is possible. In many cases, the face was not self-supporting, so shot concrete was constructed at the same time as the excavation, and the soil quality of the face was not generally investigated. In addition, in the case of foundation excavation management for light construction of dams and the like, management values are often set by flat plate loading tests, standard penetration tests, and the like, but considerable labor and time were required depending on the number of tests.

[0003] In tunnel excavation by a shield machine, for example, Japanese Patent Publication No. 3-44197, Japanese Patent Application Laid-Open No. 62-164997, and Japanese Patent Application Laid-Open No. 1-9419 are disclosed.
Japanese Patent Application Laid-Open No. 6-62103 discloses a technique in which a rod disposed in a shield machine penetrates a front face to measure soil properties.
However, these technologies have been used in the excavation of unconsolidated
It is not possible to evaluate the face condition quickly, safely and economically.

[0004]

Generally, in the field of civil engineering, especially in the tunnel field, judgment based on experience often occupies a large weight. Therefore, it is required to obtain objective and quantitative judgment information. I have. However, working close to the face of the unconsolidated ground has a safety problem, and it has been difficult to quantitatively evaluate using various measuring instruments. In addition, as mentioned above, the flat plate loading test and the standard penetration test in the lighting work require separate loading of equipment for the test and labor and time, so tests that can be performed with general-purpose heavy equipment as an extension of earthwork The development of a law is desired.

Accordingly, the present invention can solve the above problems, and can quickly, safely and economically evaluate the state of the ground in excavation work, embankment, ground improvement work, etc. of an unconsolidated ground. The purpose is to provide a soil evaluation device.

[0006]

According to the present invention, a cone penetrating means is constituted by a penetrating rod comprising a tip cone and a double pipe rod, and a hydraulic cylinder for penetrating the penetrating rod into the ground.
The cone penetrating means is attached to a heavy construction machine, and a hydraulic device of the heavy equipment drives a hydraulic cylinder of the cone penetrating means, and the cone penetrating means includes means for detecting a penetration resistance and a penetration amount of a penetrating rod. Provided.

The means for detecting the penetration resistance is preferably a load cell or a hydraulic sensor, and the means for detecting the penetration amount is preferably a displacement sensor or an oil amount which is detected and converted.

According to the present invention, the cone penetrating means is applied to the face or the ground at an arbitrary angle by a general-purpose heavy machine, and the hydraulic cylinder is driven by the hydraulic device of the construction heavy machine to move the tip cone of the penetrating rod to the face or the ground. Let it penetrate. Then, the penetration resistance and the penetration amount of the tip cone are each continuously measured by the detecting means, and the soil properties such as the face and the ground are evaluated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a penetrating device 10 which is a cone penetrating means. A cylindrical sliding body 6 is slidably fitted in the cylindrical casing 1 in the longitudinal direction by driving the hydraulic cylinder 5, and a load cell 7 for detecting a penetration resistance is inserted into the cylindrical sliding body 6. The penetrating rod 2 is engaged with the interposition. The penetrating rod 2 is composed of a double pipe rod 2 and a tip cone 3 that penetrates one end of the casing 1 and is fixed to a tip portion thereof.
A displacement sensor 8 for detecting the amount of movement of the penetrating rod 2
Is provided.

As shown in FIG. 2, the penetrating device 10 is detachably attached to a general-purpose heavy machine generally used at an excavation site or the like, for example, a side surface of a bucket arm A of a hydraulic shovel M. The hydraulic cylinder 5 that drives the rod 2 is supplied with pressure oil using a hydraulic device (not shown) of the hydraulic shovel M as a hydraulic source. In addition, it is preferable that a flow control valve (not shown) is provided in the hydraulic pressure source to control the penetration speed.

As shown in FIG. 2, the hydraulic cylinder 5 is pressed with the arm A fixed while the bottom surface of the bucket B of the hydraulic shovel M is pressed against a face or the ground (indicated by E) as shown in FIG. By driving, the tip cone 3 penetrates into the face or the ground. At this time, the penetration speed is suitably about 1 cm / s, and the penetration force and the penetration amount are continuously measured by the load cell 7 and the displacement sensor 8 and recorded on a recording device (not shown) to evaluate the soil quality. . Since the penetrating rod 2 is of a double tube type, the frictional resistance of the rod is removed, and only the penetration resistance of the cone 3 is applied to the load cell 7 for measurement.

FIG. 3 and FIG. 4 show an embodiment for ground and embankment, in which the horizontal axis indicates the penetration amount (stroke mm) and the vertical axis indicates the penetration force (kN). 3 shows two examples of the ground 1 and the embankment 1, and FIG.
In addition, two measurement examples of the embankments 2 and 3 are described, and the soil quality can be evaluated from the results.

In the soil evaluation, an N value and a qc value are employed in the design as quantitative indicators in the soil engineering. In the present invention, an index corresponding to the qc value can be obtained. Similarly, physical properties such as face and ground can be evaluated.

[0014]

The present invention is configured as described above, and has the following effects. (1) Soil evaluation such as face and ground can be carried out by effectively utilizing a general-purpose heavy machine that is permanently installed on site. (2) The measurement is performed by heavy equipment, and it is safe because there is no need for the operator to approach the face or slope in tunnel excavation. (3) Soil quality is evaluated by obtaining an index that is recognized by soil engineering. (4) A recording device and a recording medium can be used for the measurement data, and quick 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 state by the soil evaluation device of the present invention.

FIG. 3 is a diagram showing an example of a measurement value of a penetrating input.

FIG. 4 is a diagram showing another example of a measurement value of a penetrating input.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Penetration rod 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 equipment

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Shimodera 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroshi Ohta Moto-Akasaka, Minato-ku, Tokyo 2-7-7 Kashima Construction Co., Ltd. (72) Inventor Yoshinori Fukuya 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. 1-15-15 Awaza, Nishi-ku, Kashima Construction Kansai Branch F-term (reference) 2D043 AA01 AB01 AC01 BA01 BB02 BC05 2D054 GA10 GA15 GA17 GA64

Claims (1)

[Claims] 1. A cone penetrating means comprising a penetrating rod comprising a tip cone and a double pipe rod, and a hydraulic cylinder for penetrating the penetrating rod into the ground, and attaching the cone penetrating means to a heavy construction machine. A hydraulic cylinder of the cone penetrating means is driven by the hydraulic device, and the cone penetrating means is provided with means for detecting a penetration resistance and a penetration amount of a penetration rod.