KR101975600B1 - Cone pentration system for site investigation - Google Patents

Abstract

The present invention relates to a cone interpenetrating device for site investigation. The purpose of the present invention is to improve reliability on the cone interpenetrating device by accurately estimating the position and size of rock included in the ground by having an inclination sensor and a direction sensor configured in the cone interpenetrating device interpenetrated in the ground and accurately measuring information on bending due to an external force during an interpenetration process of the cone interpenetrating device, in other words, an inclination angle and an inclination direction. To this end, in a cone interpenetrating device for site investigation for measuring the state of geological features by being interpenetrated in the ground, the cone interpenetrating device (1) includes the inclination sensor (310) and the direction sensor (320), to improve reliability and usage limit on the cone interpenetrating device (1), by checking the inclination angle and bending direction, which are the information on the bending of the cone interpenetrating device (1) during the interpenetration process.

Description

{CONE PENTRATION SYSTEM FOR SITE INVESTIGATION}

The present invention relates to a cone penetration apparatus for soil measurement, and more particularly, to a cone penetration apparatus for ground measurement, which comprises a tilt sensor and an orientation sensor in a cone penetration apparatus penetrated into the ground, Accurate and precise measurement of the tilt angle and tilt direction makes it possible to precisely estimate the location and size of the rock bed and the like contained in the ground so as to improve the reliability of the cone penetration device .

In general, soft ground formed by erosion, weathering and sedimentation has various characteristics and structures according to the formation conditions.

The soft ground layer is composed of thinly layered soil such as sand seam formed of sand or silt in addition to clay, and thus has horizontal and vertical heterogeneity and anisotropy characteristics.

Although the thickness of this layer is thinner than several millimeters, it has a significant effect on the consolidation of the soft ground because of the large difference in pitch coefficient.

Therefore, when constructing civil engineering and building structures on soft ground, it is very important to acquire precise and reliable ground water constants for the target ground, and the bridge layer must be detected in the ground survey stage for reasonable soft ground design.

In addition, field site survey is an archiving method practiced on the actual site. There are a variety of test methods and available devices.

Among them, the cone penetration test (or cone penetration test) is a typical field ground experiment. When the cone probe is penetrated into the ground at a constant speed (standard 2 cm / sec), the cone penetration test This is a method of estimating the physical characteristics of the target ground by measuring resistance (qc), friction resistance (fs), and pore water pressure (u).

This cone penetration test method has the advantage of continuously acquiring the characteristics of the ground without any additional boreholes.

The cone penetration apparatus (or cone penetration test apparatus) used for the cone penetration test of the cone penetration test method is 35.7 mm in diameter and 10 cm2 in cross-sectional area.

Such penetration into the ground of the conventional cone pipe has a problem that disturbance phenomenon occurs in which the surrounding ground is pushed out or is entrained in the intrusion direction.

This disturbance causes shear deformation of the particles and reduces the strength of the soil, making it difficult to investigate the exact physical properties of the soil.

In addition, when a conventional cone penetration device is applied to the field, a large penetration device is required and the penetration rod must be continuously connected so that the depth of the penetration device can be deepened. have.

Therefore, a demand for a small-sized cone penetration apparatus is rapidly increasing.

On the other hand, the electromagnetic wave survey during the ground survey is an exploration method for measuring the target ground area using an artificial signal, which is used in various fields such as seabed topography observation, water content change observation, ground pollution observation, and facility management.

There are various kinds of electromagnetic wave exploration as follows.

First, electrical resistivity survey is a method to measure the resistivity (resistivity) and conductivity of the ground by measuring electric potential difference generated by sending current through direct current or very low frequency alternating current.

This has been mainly used to determine the approximate structure of strata and the presence of pollutants. In recent years, however, it has been used to estimate the stratified structure and design constants of the ground.

Second, induction polarimetry is a method similar to electrical resistivity survey. Four electrodes are installed on the earth's surface. After current is sent from a pair of current poles, electric current is intercepted and instantaneous potential difference is used to detect metal mines and geothermal Is widely used for characterization of

Third, natural potential exploration is a method used for geothermal and hydraulic geological survey through natural potential abnormal curves by measuring the natural potential difference between two points of the surface.

Fourth, EM is a method of analyzing the characteristics of ground using electric fields and magnetic fields, which are vector quantities perpendicular to each other. Unlike the above-mentioned methods, non-contact type measurement techniques are widely used for aircraft, ships and the like.

In consideration of the electric conductivity of the object to be measured, GPR (Ground Penetration Radar) exploration and VLF (Very Low Frequency) exploration are widely used.

Electromagnetic survey, especially electrical resistivity survey, is more sensitive than other survey methods and has a great advantage of accurately evaluating the ground condition composed of various complexes such as sand, clay and silt.

The electrical resistivity is basically measured by measuring the impedance of the ground, and the measured impedance is converted into electrical resistivity, potential difference, capacitance, phase angle and dielectric constant, etc., Accurate and reliable impedance measurement in ground survey is a very important issue.

However, as described above, the conventional cone penetration apparatus has a problem that it is difficult to grasp a precise layered structure because the sensitivity is low due to the ground disturbance caused by the large diameter.

Particularly, in the conventional cone penetration apparatus, a cone penetration device is penetrated into the ground to search for a rock layer distributed in the ground, and the cone penetration device thus intruded is bent by the rock layer in the ground, There is a problem in that it is not possible to obtain data on the positional change of the cone penetration device and that there is a limit of use such that only the tip resistance force, frictional resistance force or pore water pressure acting on the cone penetration device can be obtained.

Further, as described above, when the state of change of the course of the cone penetration device can not be confirmed by the rock layer or the like, since the degree of the rock layer in the ground is predicted through the repetitive operation of continuously penetrating the cone penetration device into the ground, There is a problem in that the working efficiency with respect to time is deteriorated.

Korean Patent Publication No. 10-1152429 (2012.06.05 Announcement) Korean Patent Publication No. 10-1452462 (issued October 23, 2014) Korean Patent Publication No. 10-1649443 (Announced 2016.08.18)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tilt sensor and an orientation sensor in a cone penetration apparatus that penetrates into the ground to detect information that is bent by an external force or the like during intrusion of the cone penetration apparatus, A tilt angle and a tilt direction can be precisely and precisely measured to accurately estimate the position and size of a rock bed included in the ground so as to improve the reliability of the cone penetration apparatus. .

According to another aspect of the present invention, there is provided a cone penetration apparatus for ground measurement, which is configured to measure a state of a lipid by penetrating into the ground, wherein the cone penetration apparatus is provided with a tilt angle And a tilt sensor and an orientation sensor that can confirm the warping direction and improve the usability and reliability of the cone penetration device.

In the present invention, the cone penetration device comprises: a cone; A first body formed at one end of the cone; A second body formed at one end of the first body; And a connector cable formed at one end of the second body; Preferably, the first or second body includes a tilt sensor and an orientation sensor.

In the present invention, the first body may include: a water pressure sensor module for measuring water pressure; And a friction sensor module for measuring frictional force; The hydraulic pressure sensor module includes: a first center pin; A first housing formed at one end of the first center pin; And a water pressure sensor formed at one end of the first housing; The friction sensor module includes a second housing; And a friction sensor disposed on one side of the second housing.

In the present invention, the first housing includes at least one first packing for maintaining airtightness and watertightness between the cone and the first body; And at least one inflow hole for allowing a predetermined space between the cone and the first body to be formed and allowing the water pressure to flow into the space to allow the water pressure sensor to perform the measurement.

In the present invention, the second body is formed in a tube shape; A tilt sensor, an orientation sensor, and a temperature sensor are disposed inside the second body; And a third housing for supporting the extension pipe to be connected to one end of the second body.

In the present invention, it is preferable that the friction sensor module includes a tip resistance sensor configured on the other side of the second housing and measuring a tip resistance.

According to the present invention, a tilt sensor and an orientation sensor are provided in a cone penetration apparatus that penetrates into the ground, so that information that is bent due to an external force or the like, that is, tilt angle and tilt direction can be accurately and precisely measured during penetration of the cone penetration apparatus It is possible to accurately estimate the position and size of the rock bed or the like contained in the ground, thereby improving the reliability of the cone penetration apparatus.

1 is a perspective view of a cone penetration apparatus according to the present invention;
2 is a sectional view of a cone penetration apparatus according to the present invention;
3 is a perspective view of the first body according to the present invention.
4 is a perspective view of a second body according to the present invention.
5 is an operational view of a cone penetration apparatus according to the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, as well as the manner in which it may be achieved, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

However, it should be understood that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well known process steps, well-known structures, and well-known techniques are not specifically described to avoid an undue interpretation of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular forms include plural forms unless otherwise specified in the specification.

It is to be understood that the terms comprise and / or comprise are used in a generic sense to refer to the presence or addition of one or more other elements, steps, operations and / or elements other than the stated elements, steps, operations and / It is used not to exclude.

And " and / or " include each and every one or more combinations of the mentioned items.

Further, the embodiments described herein will be described with reference to cross-sectional views and / or schematic drawings that are ideal illustrations of the present invention.

Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process.

In addition, in the drawings of the present invention, each constituent element may be somewhat enlarged or reduced in view of convenience of explanation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the cone penetration device 1 of the present invention includes a cone 10, a first body 20, a second body 30, and a cable connector 40 .

The cone (10) is configured at the foremost stage and performs a function of guiding intrusion into the ground smoothly.

The cone 10 is made of a material and a shape or a shape that can smoothly overcome the intrusion pressure when the intrusion pressure is directly received.

Of course, the present invention is not limited thereto, and the cone 10 can be used in any structure or shape that enables smooth penetration of the earth.

As shown in FIG. 3, the first body 20 is formed at an upper end of the cone 10 based on a penetration state, and performs a function of measuring water pressure and friction force.

The first body 20 is formed in a tubular shape.

In addition, the first body 20 includes a water pressure sensor module 210 and a friction sensor module 220.

The water pressure sensor module 210 includes a first center pin 212, a first housing 214, and a water pressure sensor 216.

The first center pin 212 functions to provide a fixing force so that one end of the cone 10 is fixed.

In addition, the first center pin 212 is threaded so that the cone 10 can be fastened.

Of course, the present invention is not limited thereto, and any structure or configuration may be used for the first center pin 212 to allow the cone 10 to be stably fixed.

In addition, an induction groove 2122 is formed at the center of the first center pin 212 to guide the water pressure generated during the process of penetration into the ground through the water pressure sensor 216 smoothly.

The guide groove 2122 can be any structure or shape that allows the hydraulic pressure acting on the ground to be smoothly measured by the hydraulic pressure sensor 216.

The first housing 214 functions to protect the first body 212 and the water pressure sensor 216 from being stably mounted in the first body 20 of the cone penetration apparatus 1. [ do.

The first housing 214 includes at least one first packing 2142 to maintain watertightness and airtightness when the first housing 214 is coupled with the first body 20.

The first packing 2142 is preferably an O-ring.

In addition, a space is formed at a predetermined interval when the cone (10) is coupled to the first body (20) in the first housing (214), and an external water pressure enters the space, And at least one inflow hole 2144 for allowing the user to measure the temperature.

The inflow hole 2144 is formed in the space between the cone 10 and the first body 20.

Of course, the present invention is not limited to this, and may be configured on one side of the cone 10 or the first body 20, and may be any structure or configuration that can smoothly measure the water pressure acting on the ground. It is possible.

The inlet hole 2144 has a correlation with the induction groove 2122 formed in the first center pin 212 so that the water pressure can be smoothly communicated.

The water pressure sensor 216 is a sensor for measuring a water pressure acting when the cone penetration device 1 is intruded.

The water pressure sensor 216 is formed at the upper end of the first center pin 212 to measure the water pressure acting on the guide groove 2122 of the first center pin 212.

Of course, the present invention is not limited to this, and the hydraulic pressure sensor 216 may adopt any position, structure, or configuration for stably measuring the hydraulic pressure acting upon penetration.

The friction sensor module 220 functions to measure a frictional force acting on the first body 20 during penetration.

The friction sensor module 220 includes a second housing 222, a friction sensor 224, and a tip resistance sensor 226.

The second housing 222 is formed within the first body 20 and functions to smoothly measure the frictional force through the friction sensor 224.

In the lower end of the second housing 222, there is formed a seating groove 2222 having a predetermined depth to hold the water pressure sensor 216 in a fixed state.

In addition, an insertion hole 2224 is formed at the center of the second housing 222 to insert a wire or the like.

The insertion hole 2224 functions to supply electric wires or the like necessary for the water pressure sensor 216 and the friction sensor 224 formed at the center of the second housing 222.

Of course, depending on the case, the insertion hole 2224 may be omitted depending on the coupling relationship or configuration relationship of the water pressure sensor 216, the friction sensor 224, and the like.

The friction sensor 224 is disposed on one side of the outer circumference of the second housing 222 to detect a frictional force acting on the cone penetration device 1. [

The friction sensor 224 has a structure or structure suitable for the purpose of use, the position to be measured, and the like.

The front end resistance sensor 226 is disposed on the outer circumferential side of the second housing 222 to detect a tip resistance acting on the cone penetration device 1.

The end resistance sensor 226 may have a suitable structure or structure according to the purpose of use, the position to be measured, and the like.

As shown in FIG. 4, the second body 30 is formed at one end of the first body 20 so as to protect the tilt sensor 310, the orientation sensor 320, and the temperature sensor 330 .

The second body 30 is formed in a tubular shape so as to have a uniform shape with respect to the first body 20.

In addition, the upper end of the second body 30 includes a third housing 340 for supporting the cable connector 40 to be connected thereto.

The inclination sensor 310 is disposed inside the second body 30 and functions to sense a tilt angle of the cone penetration device 1 due to an external force or lipid during intrusion.

The inclination sensor 310 can be used as long as the cone penetration device 1 has a structure or configuration that can be converted to a numerical value and provided to an external manager when the cone penetration device 1 is bent during the penetration process.

The orientation sensor 320 is disposed inside the second body 30 and functions to sense a direction in which the cone penetration device 1 is bent due to an external force or lipid during the penetration operation.

In addition, the orientation sensor 320 can be used in any structure or configuration so long as it can convert the bending direction into a numerical value when the cone penetration device 1 is bent during the penetration process and provide it to an external manager.

5, the current state of the cone penetration apparatus 1 intruded into the ground is accurately determined by the tilt angle and the tilt direction measured through the tilt sensor 310 and the orientation sensor 320 , And can be confirmed accurately.

For example, during the course of penetration of the cone penetration apparatus 1 into the ground, it is inevitable that it can be forcefully deflected by a hard ground such as a rock, and the inclination angle and the deflection direction of the deflected cone penetration apparatus 1 are accurate, Because it can be confirmed accurately, the location and shape of the rock like the rock can be confirmed at any point in the ground from the outside.

For example, in the conventional case, even if the cone penetration device is bent by the rock mass during the process of penetration into the ground, the data value can not be obtained. Therefore, the sensor value can be obtained by simple sensor values such as frictional force, There is a problem in that it only checks the data information.

Further, in the process of measuring (or testing) the ground by the conventional cone penetration apparatus, when the ground such as a rock bed existing in the ground is encountered, data information about the inclination angle and the inclination direction of the cone penetration apparatus is not obtained There is a problem in that it is impossible to estimate the location and size of the rock bed.

On the other hand, the cone penetration apparatus 1 of the present invention accurately and precisely measures the tilt angle and tilt direction of the cone penetration apparatus 1 by the tilt sensor 310 and the orientation sensor 320, It is possible to accurately estimate the position and size of the rock mass or the like contained in the ground, thereby improving the reliability of the cone penetration device 1. [

The temperature sensor 330 is disposed inside the second body 30 and functions to sense an underground temperature during a penetration process.

In addition, the temperature sensor 330 can be used as long as the cone penetration device 1 senses the temperature of the ground during the intrusion process and converts the detected temperature into a numerical value to provide it to an external manager .

The third housing 340 is connected to the upper end of the second body 30 and includes a tilt sensor 310, an orientation sensor 320 and a temperature sensor 330 formed inside the second body 30 While maintaining a durable durability.

The third housing 340 also functions to support the extension pipe in a stable manner in accordance with the penetration depth during the penetration process of the cone penetration device 1.

The third housing 340 may be stably fixed to the second body 30 to support the inner tilt sensor 310, the orientation sensor 320 and the temperature sensor 330 It is possible to use any structure or structure that enables the connection of the extension pipe to be stably performed.

The cable connector 40 is provided at one end of the third housing 340 and is connected to the control device 40. The control device 40 includes a display for performing the identification and adjustment of the master data, And the wires and the like are stably connected to each other.

The cable connector 40 may have various structures or configurations according to a structure that can be stably fixed to one end of the third housing 340 and a connection structure with a host device.

The operation state of the cone penetration apparatus constructed as above will be described below.

First, the setting of the cone penetration device 1 is performed through the master key.

For example, the zero point of the tilt sensor 310 and the azimuth sensor 320 may be adjusted so that accurate and precise data information about the bending tilt angle and bending (inclination) direction during the penetration process of the cone penetration apparatus 1 can be obtained do.

Then, when the setting of the cone penetration device 1 is completed, it is intruded into the ground.

The hydraulic pressure, frictional force, temperature and the like acting on the cone penetration device 1 during the penetration of the cone penetration device 1 are detected by the pressure sensor 216, the friction sensor 224, the temperature sensor 330, .

When the cone penetration device 1 is bent by a rock or the like during the penetration process, the tilt sensor 310 and the orientation sensor 320, which are configured in the cone penetration device 1, The tilt angle and the bending direction can be accurately and precisely confirmed.

On the other hand, the cone penetration device (1) smoothly penetrates the cone penetration device (1) by continuously connecting the extension pipe according to the penetration depth.

Further, since the connection method of the extension pipe to the cone penetration device 1 is the same as the conventional one, it can be easily grasped by a general technician even though it is not described in detail here.

The depth of the cone penetration device 1 can be determined according to the length of the extension pipe extending to the cone penetration device 1.

Therefore, the cone penetration apparatus 1 can accurately and precisely measure the tilt angle and tilt direction of the cone penetration apparatus 1 by the tilt sensor 310 and the orientation sensor 320, And the position and size of the rock mass or the like are accurately estimated, thereby improving the reliability of the cone penetration device 1. [

The above description is only one embodiment for carrying out the cone penetration apparatus for ground measurement, and the present invention is not limited to the above embodiment. It will be understood by those skilled in the art that various changes may be made without departing from the spirit of the invention.

1: Cone penetration device 10: Cone
20: first body 210: hydraulic pressure sensor module
212: first center pin 2122: guide groove
214: first housing 2142: first packing
2144: Inflow hole 216: Water pressure sensor
220: Friction sensor module 222: Second housing
2222: seating groove 2224: insertion hole
224: Friction sensor 226: Lead resistance sensor
30: second body 310: tilt sensor
320: orientation sensor 330: temperature sensor
340: third housing 40: cable connector

Claims (6)

A first body 20 formed at one end of the cone 10; a second body 30 formed at one end of the first body 20; And a connector cable (40) formed at one end of the ground terminal,
The first body 20 measures a water pressure and includes a first center pin 212, a first housing 214 formed at one end of the first center pin 212, a first housing 214, And a water pressure sensor module 210 comprising a water pressure sensor 216 formed at one end of the water pressure sensor module 210;
The second body 30 is formed in a tube shape and a tilt sensor 310, an orientation sensor 320 and a temperature sensor 330 are formed inside the second body 30, A third housing (340) is formed at one end of the body (30) to support the connection of the extension pipe;
The tilt angle and the bending direction of the cone penetration device 1 which are information bent during the penetration process can be confirmed in the first or second body 20 or 30 so that the use tolerance and reliability The tilt sensor 310 and the orientation sensor 320 are configured so as to be improved;
In the first housing 214,
At least one first packing (2142) for maintaining airtightness and watertightness between the cone (10) and the first body (20); And at least one inflow hole for allowing a predetermined space to be formed between the cone (10) and the first body (20) to be spaced apart from each other and allowing the water pressure sensor (216) (2144);
In the friction sensor module 220,
A tip resistance sensor 226 provided on the other side of the second housing 222 for measuring a tip resistance;
And a ground penetrating unit for ground penetration. delete delete delete delete delete

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