JP2014169982A - Inclination measuring apparatus and inclination measuring method for retaining walls, and monitoring method for retaining walls - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inclination measuring apparatus and method for retaining walls excelling in working efficiency over existing such apparatus and method in the ease of introduction and management of measured value history.SOLUTION: An inclination measuring apparatus, equipped at least with a clinometer 1 that measures the inclination angle of a retaining wall and a function to acquire the value measured by the clinometer 1 by wireless communication from an external terminal B. Further equipped at least with a passive type IC tag 2, the apparatus calculates relative displacements of the retaining wall on the basis of the acquired measured value. By causing the IC tag 2 to record the measurement history of the clinometer 1, the retaining wall itself is enabled to keep the measurement history.

Description

  TECHNICAL FIELD The present invention relates to a retaining wall inclination measuring device and an inclination measuring method, and a retaining wall monitoring method for monitoring deformation of the retaining wall when maintaining the retaining wall such as a reinforced earth wall.

  Retaining wall is a structure that soils the ground and mountain surface with installed wall materials and reinforcing members, etc., and is often used for general road, highway, constructed land, steep slope, river and coastal quay, cliff protection, etc. It has been.

  Many retaining walls are constructed throughout the country, and there are many retaining walls that have been installed for a long time. In order to prevent accidents such as the collapse of these retaining walls, it is necessary to monitor in advance the necessity for repair, repair, reconstruction, etc. (hereinafter referred to as “repair”, etc.).

As a method for determining the necessity of repairing the retaining wall, there is a method for monitoring the dropping, inclination, deformation, etc. of the wall material.
The dropping of the wall material can be monitored mainly by visual inspection by a person.
However, since it is difficult to grasp the inclination and deformation of the wall material by the above-mentioned visual inspection, a method of using dedicated equipment such as light wave surveying or stereo camera surveying is common.

  Non-Patent Document 1 below does not measure the inclination of a concrete structure, but discloses a system that monitors the deterioration of a concrete structure by measuring the strain of a reinforcing bar inside the concrete structure with an RFID. Has been.

http://www.taiheiyo-cement.co.jp/rd/rfid/hizumi/index.html

In the conventional method described above, a problem including at least one of the problems described below may occur.
(1) Viewpoint of securing measurement location Lightwave surveying and stereo camera surveying need to be measured from the space in front of the retaining wall, and it may not be possible to secure that space on retaining walls constructed on steep slopes. It was.
(2) Viewpoint of history management of measured values What is important for examining the stability of the retaining wall is the occurrence of a displacement difference between the initial value and the abnormal time, or a sudden displacement difference from the previous measured value. Therefore, in order to examine the stability of the retaining wall, not only the current survey results but also the past survey results are required.
However, in the conventional survey method, it is necessary to install the target on the wall material. Therefore, if the target is dropped or the measurement location is changed due to re-installation, continuity with past survey results may not be maintained. .
In addition, past survey results are mostly managed at the office by storing data in document files, PCs, etc., and managing the history of these survey results for all retaining walls, The operation of searching for the result is very time-consuming and complicated.
(3) Viewpoint of work cost In order to implement the conventional surveying method, specialized knowledge and expensive equipment are required, and it is impractical to monitor all the numerous retaining walls using the conventional surveying method. there were.
(4) Viewpoint of rapid stability evaluation As described in (2) above, in order to study the stability of retaining walls, not only the current survey results but also past survey results are required. It was difficult to quickly evaluate sex at the surveying site.
(5) Viewpoint of ease of introduction to existing retaining wall The strain measurement system as in Non-Patent Document 1 needs to be incorporated in advance in the newly installed structure, and an additional measurement system is added to the existing structure. It cannot be introduced.

  Therefore, it is an object of the present invention to provide a retaining wall tilt measuring device, a tilt measuring method, and a monitoring method that are more efficient or convenient than conventional ones.

The present invention is a tilt measuring device installed on a retaining wall, and includes at least a tilt meter that measures a tilt angle of the retaining wall and a function of acquiring a measured value of the tilt meter by wireless communication from an external terminal. And a passive type IC tag. At least, a retaining wall inclination measuring device is provided.
The present invention also provides a method for measuring the inclination of a retaining wall, characterized in that a measured value of an inclinometer provided on the retaining wall is acquired by wireless communication via a passive IC tag.
The invention of the present application is characterized in that a measured value of an inclinometer provided on a retaining wall is acquired by wireless communication via a passive IC tag, and a displacement of the retaining wall is calculated from the measured value. Provide a wall monitoring method.
In the present invention, a history of the measured values may be stored in the IC tag.

According to the present invention, at least one of the effects described below can be obtained.
(1) There is no need to secure a measurement space in front of the retaining wall, and any on-site conditions can be selected.
(2) Inclinometers can be measured, recorded, and read by the acquisition means without requiring specialist knowledge, and the past and present values of retaining wall inclination can be immediately confirmed.
(3) By recording the measurement history of the inclinometer on the IC tag, it is as if the retaining wall itself stores the measurement history, and the administrator does not need to manage the recording separately.
(4) Information other than the measured value of the inclinometer (for example, related information such as contractor, inspection contractor, retaining wall specifications, repair history, etc.) is separately recorded on the IC tag, so that it can be used for construction management other than monitoring. Can be used.
(5) Since each means constituting the present invention can be diverted with widely known parts, the present invention can be implemented at low cost.
(6) By using a passive IC tag, it is not necessary to provide a power source for the tilt measuring device itself, and displacement can be measured and recorded semi-permanently and long-term maintenance management becomes possible.
(7) Easy to introduce into existing retaining walls.

The schematic diagram which shows the basic composition of the inclination measuring apparatus of this invention. The schematic diagram which shows the usage example of the inclination measuring apparatus of this invention. The schematic diagram which shows the other usage example of the inclination measuring apparatus of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

First, the basic configuration of the tilt measuring apparatus according to the present invention will be described.
<1> Overall Configuration An inclination measuring apparatus A according to the present invention is an apparatus that is attached in advance or later to a retaining wall or a wall surface material (hereinafter referred to as a retaining wall or the like) that is a measurement target. It comprises at least these two elements.
The inclinometer 1 and the IC tag 2 may be configured by independent members, or may be configured by a single member in which the respective functions are integrated.
In addition, the inclination measuring device A may be affixed to the surface of a retaining wall or the like, or may be previously embedded in the retaining wall in a range where wireless communication can be performed from the outside of the retaining wall when newly installed. Good.
Details of each element will be described below.

<2> Inclinometer The inclinometer 1 is a device that is installed on a retaining wall or the like and measures an inclination angle of the retaining wall or the like.
The inclinometer 1 can use a known sensor capable of detecting an inclination angle, such as a pendulum type or a spirit level.

<3> IC Tag The IC tag 2 is a device installed on the retaining wall together with the inclinometer 1.
The IC tag 2 includes an antenna 21 that communicates with the outside, a memory 22 that records measurement values, and a control unit 23 that controls the antenna 21, the memory 22, and the inclinometer 11.
The IC tag 2 is desirably a passive type that does not require a self-power supply.
The IC tag 2 has a function of starting the inclinometer 1, recording measured values, and transmitting measured values to the external terminal B using power secured by RFID electromagnetic induction caused by the approach of the external terminal B described later. Have

<4> Other Elements The external terminal 3 is a device that can transmit and receive information to and from the IC tag 2 through wireless communication.
The external terminal B includes at least a reader / writer 3 for the IC tag 2.
More preferably, the external terminal includes at least a control unit 4 having a function of calculating the displacement of the retaining wall based on the measurement value acquired from the IC tag, a memory 5 for storing the displacement, and a display illustrating the displacement of the retaining wall. Any one of the means 6 may be provided.

Note that the displacement of the retaining wall or the like in the calculation unit 5 can be calculated as both a relative displacement and an absolute displacement.
The calculation of the displacement can be performed by a method that can be appropriately performed by those skilled in the art based on the acquired measurement values and the conditions such as the structural specifications such as the retaining wall.
For example, when assuming a retaining wall that can be tilted without deformation, if a plurality of inclination measuring devices A are provided so as to be separated in the vertical direction of the retaining wall or the like, each measured value and the difference between those measured values Thus, it is possible to calculate the relative displacement between the respective inclination measuring devices A and to grasp the posture of the retaining wall or the like.
Then, if absolute coordinates at any one location such as a retaining wall are separately measured and combined with the relative displacement, the absolute displacement of the retaining wall or the like can be calculated.

<5> Measuring method Various methods are conceivable as a procedure for acquiring a measured value by wireless communication from the existing inclination measuring apparatus A using the external terminal B.
For example, the external terminal B can be hung down from the top of a retaining wall, or a scaffold can be provided on the front surface of the retaining wall to allow workers to enter and exit. The IC tag 2 and the external terminal B installed on the retaining wall There is a method of making a close proximity communication.

<6> First Example A method for measuring the inclination of an integral retaining wall will be described with reference to FIG.

FIG. 2A is a schematic view showing a state in which the inclination measuring device A is installed at the top end portion of the integral retaining wall C. FIG.
FIG. 2B is a simplified model diagram of FIG.
The measured value of the inclination measuring apparatus A in the initial state is assumed to be 0 °, and the height of the retaining wall is L. The height of the retaining wall C corresponds to the height from the ground surface to the inclination measuring device A.

FIG. 2C is a simplified model diagram when the retaining wall C is inclined with the bottom surface of the retaining wall C as the center.
When the measured value of the inclination measuring device A is θ, it is possible to calculate at the external terminal B that the top end portion of the retaining wall C is displaced forward by t = Lsinθ as shown in FIG.
With these simple arithmetic processes, the displacement of the retaining wall C can be easily calculated.

  Although not shown, the vertical displacement of the retaining wall C can also be calculated based on the same concept as described above.

  Even in the case of an inclined retaining wall installed on a slope, the displacement of the retaining wall C can be calculated in the same way as long as the inclination angle is calculated based on the initial state.

  The retaining wall monitoring method can be realized by calculating the inclination angle and displacement of the retaining wall C every predetermined period, and determining the necessity of repair based on an arbitrary determination condition.

<7> 2nd Example Next, the method to measure the inclination of the split type retaining wall C is demonstrated, referring FIG.

FIG. 3A shows an outline of the state in which the inclination measuring devices (A1, A2, A3... An) are individually installed on the wall surface materials (D1, D2, D3... Dn) constituting the retaining wall C. FIG.
FIG. 3B is a simplified model diagram of FIG.
The measured value of each inclination measuring device A in the initial state is assumed to be 0 °, and the height of each wall surface material D is L.

FIG.3 (c) is a simple model figure when each wall surface material D each inclines.
Different identification numbers are assigned to the IC tags 2 in the inclination measuring apparatus A, and the external terminal B obtains these identification numbers together with the measured values, thereby grasping the inclination angle of each wall material D. Can do.

The relative displacement in the horizontal direction based on the measurement value of each inclination measuring device A can be obtained by the following equation.
A1 relative displacement from the bottom of the retaining wall (t ₁ ): Lsinθ ₁
Relative displacement of A2 from A1 (t ₂ ): Lsinθ ₂
Relative displacement of A3 from A2 (t ₃ ): Lsinθ ₃
・ ・
Relative displacement of An from An-1 (t _n ): Lsinθ _n

In the present embodiment, since the bottom surface of the retaining wall C is assumed to be immobile, the relative displacement amounts (t ₁ , t ₂ ... T _n ) based on the inclination measuring devices A are summed in order from the bottom. The absolute displacement of the entire retaining wall C can be calculated.

  The method for calculating the total displacement is not limited to the method described above, and if the absolute position of a specific location (for example, a certain inclination measuring device A) is obtained, the total of the retaining wall C is calculated by adding the relative displacements based on the absolute position. Absolute displacement can be calculated.

<8> Modification Examples of the inclination measuring apparatus according to the present invention will be described below.

[Measurement history function]
In the present invention, one or both of the IC tag 2 and the external terminal may store a measured value of the tilt measuring device or a history of displacement calculated by the external terminal B.
According to the said structure, the state of a retaining wall etc. can be grasped | ascertained in time series.
For example, if the measured value is small but changes greatly from the previous measurement, it is predicted that there is a high need for repair, or if the measured value is large but the change from the previous measurement is small, the current state is maintained. This makes it possible to make flexible judgments such as continuing monitoring.

[Additional information of IC tag]
In the present invention, other information may be recorded on the IC tag 2.
For example, it is possible to store information such as information on construction companies such as retaining walls, management companies, and specifications of retaining walls.
According to the configuration, by storing various information in the retaining wall itself, information is collected in advance on the worker side, or information necessary for information processing on the external terminal B side is IC tag each time. This is advantageous in that it can be acquired from the two sides.

[Write function from external terminal]
The present invention can also be configured so that information can be written to the IC tag 2 in the inclination measuring apparatus A from the external terminal B or other information processing apparatus.
For example, the inclination measuring device of the present invention is introduced by converting the inclination state of the existing retaining wall, which has already been managed by documents, into a format corresponding to the inclination measuring device of the present invention and recording it in the IC tag 2 Retaining walls can be maintained in the form of utilizing previous information.

A Inclination measuring device 1 Inclinometer 2 IC tag 21 Antenna 22 Memory 23 Control unit B External terminal 3 Reader / writer 4 Control unit 5 Memory 6 Display means C Retaining wall D Wall material

Claims (4)

An inclination measuring device installed on a retaining wall,
An inclinometer for measuring the inclination angle of the retaining wall;
A passive IC tag having at least a function of acquiring a measurement value of the inclinometer by wireless communication from an external terminal;
An apparatus for measuring the inclination of a retaining wall.   2. The retaining wall inclination measuring device according to claim 1, wherein the IC tag stores a history of the measured values.   A method for measuring a tilt of a retaining wall, comprising: obtaining a measured value of an inclinometer provided on the retaining wall by wireless communication via a passive IC tag.   A method for monitoring a retaining wall, comprising: obtaining a measured value of an inclinometer provided on the retaining wall by wireless communication via a passive IC tag, and calculating a displacement of the retaining wall from the measured value.

Images