KR101928193B1 - Method for predicting data of tower footing - Google Patents

Abstract

The present invention relates to a method for predicting tower base data, comprising: a step of measuring an electric field of the underground around a tower base buried for supporting a tower; a step of calculating a relation equation of an electric resistance of the underground from the electric field measured in the step of measuring an electric field; and a step of deriving the base data through the relation equation of the electric resistance and the measured electric field. According to the present invention, the tower base data can be precisely predicted.

Description

METHOD FOR PREDICTING DATA OF TOWER FOOTING

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for predicting the specifications of a steel tower foundation buried in the ground.

The steel tower is made of steel or steel and is mainly used as a support for the transmission line. The shape of the tower is different depending on the transmission power, voltage, terrain, etc. of the line (line) .

In order to prevent the steel tower from collapsing and falling down, a foundation (footing, foundation, foundation) is installed on the underground, and a steel tower is installed thereon.

There are inverted T-shape, L-shape, and heart shape depending on the conditions such as topography.

The steel tower is a structure where safety is important. As the time passes, it becomes aged due to the influence of the wind speed and it is necessary to reinforce the foundation.

Therefore, it is periodically considered stability. In Korea, the number of steel towers completed before June of 1988 is 4,324, and the number of steel towers that need reinforcement is 4,220.

However, in order to reinforce the foundation of the steel tower, the specifications of the foundation must be grasped. Of the 4,220 steel towers that require reinforcement, 2,306 steel towers are not secured.

Electrical resistivity survey, seismic survey, and electromagnetic survey can be used to explore the underground of the pylon.

When conducting electrical resistivity survey, it is impossible to accurately determine the shape and size of the steel tower, and a large site is needed for exploration.

In the case of EM survey, the steel tower foundation is not conductive because it has no conductivity, and seismic surveys do not obtain accurate results because the signal is interfered by the steel towers.

That is, it is difficult to accurately determine the shape and size of the steel tower foundation by the existing method.

The matters described in the background art are intended to aid understanding of the background of the invention and may include matters which are not known to the person of ordinary skill in the art.

Korean Patent Publication No. 10-2014-0049240

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for accurately predicting the specifications of a steel tower foundation.

According to an aspect of the present invention, there is provided a method for predicting a steel tower base material, comprising the steps of measuring an electric field of the earth at the periphery of a foundation buried for supporting a steel tower, measuring an electric resistance of the ground from an electric field measured by measuring the electric field And deriving a specification of the base through a relational expression for the measured electric field and the electric resistance.

The step of measuring the ground electric field includes the steps of: constructing a sidewall parallel to the left and right sides of the foundation, having the same length; installing a plurality of sensors at each of the two points by the sidewall; And a step of measuring the temperature.

And the sensor is five per side point when the base is a heart base.

Further, when the base is an L-shaped base, the sensor is characterized by 7 per side point.

The plurality of sensors provided at the centers of the respective points are spaced apart from each other by at least 0.5 m.

The relational expression for the electrical resistance is derived from the relationship between the current when the base is not present, the current corresponding to the area of the base, and the current considering the base material.

Thus, the relational expression for the electric resistance is characterized by including the electric conductivity of the soil, the electric conductivity of the foundation, and the ratio of the permittivity of the soil and the permittivity of the foundation as variables.

According to another aspect of the present invention, there is provided a method of predicting a steel tower base material, comprising: measuring an electric field at a periphery of a foundation buried for supporting a steel tower; calculating a relational expression for the electric resistance in the ground from the measured electric field; The relation of the electric resistance calculated in the case where the base is the core base is expressed by the following equation.

은 전기저항,

는 전기장 측정 센서의 반지름,

은 흙의 전기전도도,

는 심형 기초의 전기전도도,

은 전기장 측정을 위한 두 센서 사이 거리,

는 흙의 유전율(

)과 심형 기초의 유전율(

)의 비,

,

는 심형 기초의 모양 변수임.)(here,

Electrical resistance,

The radius of the electric field measurement sensor,

The electrical conductivity of the soil,

Is the electrical conductivity of the heart base,

The distance between two sensors for electric field measurement,

Is the dielectric constant of soil

) And the dielectric constant of the heart base

),

,

Is the shape parameter of the heart base.)

According to another aspect of the present invention, there is provided a method for predicting a steel tower base material, comprising the steps of: measuring an electric field at a periphery of a foundation buried in order to support a steel tower; calculating a relational expression for the electric resistance in the ground from the measured electric field; And the relationship of the electric resistance calculated when the base is the L-shaped base is expressed by the following equation.

은 전기저항,

는 전기장 측정 센서의 반지름,

은 흙의 전기전도도,

는 L형 기초의 전기전도도,

은 전기장 측정을 위한 두 센서 사이 거리,

는 흙의 유전율(

)과 L형 기초의 유전율(

)의 비,

,

,

,

는 L형 기초의 모양 변수임.)(here,

Electrical resistance,

The radius of the electric field measurement sensor,

The electrical conductivity of the soil,

Is the electrical conductivity of the L-shaped base,

The distance between two sensors for electric field measurement,

Is the dielectric constant of soil

) And the dielectric constant of the L-shaped base

),

,

,

,

Is the shape parameter of the L-shaped foundation.)

According to the method of predicting the steel tower basic specification of the present invention, it is possible to estimate the approximate depth and shape of the steel tower foundation by measuring the electric resistance value around the steel tower.

Therefore, it is possible to predict the penetration depth and shape of the foundation of the steel tower through the electric field analysis on the foundation of the heart and the foundation of the L type, which can not be predicted in the past, so that the reinforcement work of the steel tower base can be performed.

FIG. 1 is a diagram for explaining a method of predicting the shape of a heart base.
Fig. 2 is a view for explaining a method of predicting the specifications of the L-shaped foundation.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In describing the preferred embodiments of the present invention, a description of known or repeated descriptions that may unnecessarily obscure the gist of the present invention will be omitted or omitted.

In the method of predicting a steel tower base material according to the present invention, first, a sidewall is formed parallel to the left and right sides of the base of the steel tower and having the same length.

Then, a plurality of sensors are provided on each of the two points.

The sensor is installed at 5 points for each point on the core foundation and 7 points for each point on the L-type foundation, and measures a plurality of data.

It is preferable that a plurality of sensors installed around each point are spaced apart by 0.5 m or more considering the influence of the surroundings.

The electric field is measured through the installed sensor, and the electric resistance of the ground is theoretically calculated from the measured electric field.

Then, inverse analysis is performed from the calculated electric resistance equation to derive various specifications of the foundation.

1 and 2 are diagrams for explaining a method of calculating an electric resistance equation from a measured electric field, wherein Fig. 1 is a method for predicting a parameter of a heart base, Fig. 2 is a graph for predicting parameters of an L- Method.

First, with reference to FIG. 1, description will be given of the specification of the heart base.

The current I means the amount of charge passing through an arbitrary cross-sectional area ds during the elapse of time, and is expressed by the following equation (1): Gauss'law =

는 전기전도도,

는 전기장이다.here,

Lt; / RTI >

Is an electric field.

Equation (1) is applied to the foundations of the heart in Fig.

은 흙의 전기전도도,

은 흙에서 발생하는 전기장,

는 심형 기초의 전기전도도,

는 심형 기초에서 발생하는 전기장,

은 두 센서를 연결한 선에서 흙 내부 임의의 점까지 거리이다.here,

The electrical conductivity of the soil,

The electric field generated from the soil,

Is the electrical conductivity of the heart base,

Is an electric field generated at the base of the heart,

Is the distance from the line connecting the two sensors to any point in the soil.

)을 고려한 전류량을 의미한다.The first term in Equation 2 is the electric field analysis equation when there is no heart base, the second term is the amount of current in the core base area, and the third term is the heart base material

) Is taken into consideration.

The electric field generated from the soil is expressed by Equation (3), and the relationship between the electric field generated in the core base and the electric field generated in the soil is expressed by Equation (4).

은 흙의 유전율,

는 전하량,

은 센서에서 흙 내부 임의 점까지 거리,

은 두 센서 사이 거리, 벡터

은 방향의 수직 벡터,

는 흙의 유전율(

)과 심형 기초의 유전율(

)의 비이다.here,

The dielectric constant of soil,

The charge amount,

The distance from the sensor to any point in the soil,

Is the distance between two sensors, vector

A vertical vector in the direction of silver,

Is the dielectric constant of soil

) And the dielectric constant of the heart base

).

The reason for doubling in Equation 3 is that any point in the soil is affected by the source sensor and the receiver sensor, respectively.

Equation (3) and Equation (4) are applied to the first term of Equation (2).

)는 기존 이론식에 의해서 수학식 6과 같으며 수학식 6을 수학식 5에 대입하여 수학식 2를 정리하면 수학식 7과 같다.Charge amount

) Is expressed by Equation (6) according to the existing equation, and Equation (6) is substituted into Equation (5), and Equation (2) is summarized as Equation (7).

는 센서의 반지름,

는 전압이다.here,

The radius of the sensor,

Is the voltage.

Equation (7) can be substituted into Equation (7) to obtain Equation (8).

Substituting Equations (3) and (6) into the integral term of Equation (8), Equation (8) can be expressed as Equation (9).

,

는 도 1의 심형 기초모양 변수이다.here,

,

Is the heart shape basic parameter of FIG.

) 식으로 표현하면 수학식 10과 같다.Thus, equation (9)

) ≪ / RTI >

,

,

,

,

,

,

,

이다.The variable in equation (10)

,

,

,

,

,

,

,

to be.

는 아는 변수이며,

에 따라

을 5번 측정하여 얻고자 하는 변수

,

,

,

,

를 역해석을 통해 획득 가능하다.among these

Is a known variable,

Depending on the

To be obtained by measuring 5 times

,

,

,

,

Can be obtained through inverse analysis.

Next, the specification calculation of the L-shaped base will be described with reference to Fig.

The current flowing when the L-shaped foundation exists in the underground is expressed by Equation (12), which is a modification of Equation (2).

은 L형 기초의 전기전도도,

은 L형 기초에서 발생하는 전기장이다.here,

The electrical conductivity of the L-shaped base,

Is an electric field generated at the L-shaped base.

)을 고려한 전류량을 의미한다.The first term in equation (12) is the electric field analysis equation when there is no L-shaped base, the second term is the amount of current for the L-shaped base area, and the third term is the L-

) Is taken into consideration.

The electric field generated from the soil is expressed by Equation (3), and the relationship between the electric field generated in the L-shaped foundation and the electric field generated in the soil is expressed by Equation (13).

는 흙의 유전율(

)과 L형 기초의 유전율(

)의 비이다.here,

Is the dielectric constant of soil

) And the dielectric constant of the L-shaped base

).

The first term of Equation (12) is expressed by Equation (5).

Equation (13) can be substituted into Equation (14) to obtain Equation (15).

The integral term in Equation (15) can be expressed as Equation (16).

,

,

,

는 도 2의 L형 기초모양 변수이다.here,

,

,

,

Is the L-shaped basic shape variable of FIG.

) 식으로 표현하면 수학식 17과 같다.Therefore, equation (16)

) ≪ / RTI >

,

,

,

,

,

,

,

,

,

이다.The variable in equation (18)

,

,

,

,

,

,

,

,

,

to be.

는 아는 변수이며,

에 따라 을 7번 측정하여 얻고자 하는 변수

,

,

,

,

,

,

,

를 역해석을 통해 획득 가능하다.among these

Is a known variable,

The number of times to measure 7

,

,

,

,

,

,

,

Can be obtained through inverse analysis.

While the present invention has been described with reference to the exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (9)

delete Measuring an electric field in the ground around the foundation embedded to support the tower;
Calculating a relational expression for the electric resistance in the ground from the electric field measured by measuring the electric field; And
And deriving a specification of the foundation through a relational expression for the measured electric field and the electric resistance,
The step of measuring the ground electric field includes:
Constructing a sidewall of parallel and parallel length to the left and right about the foundation;
Installing a plurality of sensors at two points on the side line; And
Measuring an electric field through the sensor,
Wherein the relational expression for the electrical resistance is derived from the relationship between the current when the base is not present, the current corresponding to the area of the base, and the current taking into account the material of the base.
Prediction of basic specifications of steel tower. The method of claim 2,
Characterized in that the sensor is 5 per side point if the base is a heart base.
Prediction of basic specifications of steel tower. The method of claim 2,
And said sensor is 7 per side point when said base is an L-shaped base.
Prediction of basic specifications of steel tower. The method of claim 2,
Wherein a plurality of sensors provided at centers of the respective points are spaced apart from each other by at least 0.5 m.
Prediction of basic specifications of steel tower. delete The method of claim 2,
Wherein the relational expression for the electrical resistance comprises as a parameter the electrical conductivity of the soil, the electrical conductivity of the foundation, and the ratio of the dielectric constant of the soil to the dielectric constant of the foundation.
Prediction of basic specifications of steel tower. The electric field is measured at the periphery of the foundation buried in order to support the steel tower, and a relational expression for the electric resistance in the ground is calculated from the measured electric field to derive a specification of the foundation through the relational expression for the calculated electric resistance,
Wherein the relational expression for the electric resistance calculated when the foundation is a core foundation is expressed by the following equation.

(here,

Electrical resistance, The radius of the electric field measurement sensor,

The electrical conductivity of the soil,

Is the electrical conductivity of the heart base,

The distance between two sensors for electric field measurement,

Is the dielectric constant of soil

) And the dielectric constant of the heart base

),

,

Is the shape parameter of the heart base.) The electric field is measured at the periphery of the foundation buried in order to support the steel tower, and a relational expression for the electric resistance in the ground is calculated from the measured electric field to derive a specification of the foundation through the relational expression for the calculated electric resistance,
Wherein the relational expression for the electrical resistance calculated when the foundation is an L-shaped foundation is expressed by the following equation.

(here,

Electrical resistance,

The radius of the electric field measurement sensor,

The electrical conductivity of the soil,

Is the electrical conductivity of the L-shaped base,

The distance between two sensors for electric field measurement,

Is the dielectric constant of soil

) And the dielectric constant of the L-shaped base

),

,

,

,

Is the shape parameter of the L-shaped foundation.)

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