JP2008051676A - Earthquake damage measurement system using maximum response member angle measurement device for elevated bridge column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and high precision earthquake damage measurement system using a system measurement device for measuring a maximum response member angle of an elevated bridge column. <P>SOLUTION: The earthquake damage measurement system using the maximum response member angle measurement device for the elevated bridge column includes a sensor system measuring the maximum response member angle in two directions of the elevated bridge column, a transmission system of a radio LAN system or an RF-ID tag system transmitting measurement data from the sensor system, and an evaluation system taking the measurement data transmitted from the transmission system and evaluating the degree of damage of the elevated bridge column. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an earthquake disaster measurement system using a maximum response member angle measuring device for a viaduct column, and more particularly to a system for measuring a maximum response member angle and a damage level of a viaduct column.

  Currently, there is a system for estimating the damage status of a column from data obtained by using an acceleration sensor as a system to detect the earthquake itself, and judging whether or not train operation is possible. There is no system to grasp.

Further, a bridge diagnosis technique using the maximum strain memory sensor (the following Non-Patent Document 1) has been proposed.
Shimoaki Shimoaki, Yoshimasa Matsui, Shuichi Shinkawa, Yoshimasa Nakaizumi: “Symposium on Bridge Diagnosis Technology Using Maximum Strain Memory Sensor”, “Symposium on Seismic Reinforcement / Repair Technology, Seismic Diagnosis Technology”, Vol. 3, pp. 143-150, 1999

  Acceleration data is inaccurate in grasping the actual damage state, so a system for directly grasping column damage is required. There is a maximum response member angle as an index, and a system that can measure the earthquake response in a wide area by measuring the maximum response member angle of a viaduct column with low cost and high accuracy is desired.

  In view of the above situation, an object of the present invention is to provide an earthquake disaster measurement system using a system measurement device that measures the maximum response member angle of a viaduct pillar that is inexpensive and highly accurate.

In order to achieve the above object, the present invention provides
[1] In an earthquake disaster measurement system using a maximum response member angle measuring device for a viaduct column, a sensor system for measuring the maximum response member angle in two directions of the viaduct column and a wireless LAN for transmitting measurement data from the sensor system Or an RF-ID tag type transmission system, and an evaluation system that takes measurement data transmitted from the transmission system and evaluates the damage level of the viaduct pillar.

  [2] In the earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct column described in [1] above, about one sensor system is arranged for each block of the viaduct column.

  [3] In the earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct pillar described in [2] above, the measurement data is sent from the sensor system to a short-range wireless LAN transmitter, and then the short-range wireless The data is sent to the LAN receiver, and further transmitted to the command station in a relay form by transmission / reception of a long-distance wireless LAN.

  [4] In the earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct column described in [2] above, transmitting measurement data from the sensor system to a command center using an RF-ID tag method. Features.

  [5] In the earthquake disaster measurement system using the apparatus for measuring the maximum response member angle of a viaduct column described in [1] above, the evaluation system grasps the relationship between the maximum response member angle of the viaduct column and the damage level of the viaduct column. It is characterized by doing.

  According to the present invention, the following effects can be achieved.

  (1) The maximum response member angle of a viaduct column can be easily measured by a mechanical peak sensor, and the earthquake disaster of a viaduct column in a wide area can be measured.

  (2) It is possible to measure the maximum response member angle of the viaduct pillars in two directions with high accuracy and to grasp the damage level of each viaduct pillar with one apparatus.

  (3) By disposing one sensor system for each block of the viaduct pillar, it is possible to measure the damage level of the entire viaduct.

  The earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct of the present invention can be used for measuring earthquake disasters of a viaduct in a wide area.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of an earthquake disaster measuring system using a system measuring apparatus for measuring the maximum response member angle of a viaduct column showing an embodiment of the present invention.

  In this figure, 1 is a viaduct pillar, and 2 is a maximum response member angle θ measured in two directions of the viaduct in the X direction (line direction) and the Y direction (line direction perpendicular to the line) installed at the top end of the viaduct pillar 1. A possible sensor system 3 includes a transmission system for transmitting measurement data from the sensor system 2, and 4 includes an evaluation system for taking in and measuring the measurement data transmitted via the transmission system 3.

  The evaluation system 4 can acquire the installation position data A, the response maximum member angle B, and the damage level C. In the case of the viaduct pillar 1, it is possible to accurately grasp the damage level of the viaduct by arranging one sensor system in one block.

  First, the sensor system of the earthquake disaster measurement system according to the present invention will be described.

  2 is a schematic diagram of a sensor system showing an embodiment of the present invention, FIG. 3 is a schematic diagram of a peak sensor as a mechanical sensor in FIG. 2, and FIG. 4 is a substitute drawing showing an appearance of the maximum response member angle measuring device. It is a photograph of.

  In this figure, 11 is a viaduct column, 11A is a plastic hinge section in the viaduct column (where damage is concentrated near the base of the RC column member), 12 is an upper beam supported by the viaduct column 11, and 13A is the X direction. A first peak sensor 13B is arranged in the Y direction perpendicular to the X direction. The second peak sensor 13B is a first jig (not shown) in the Y direction. ) And a peak sensor having the same structure as the first peak sensor 13B is arranged in the Y direction. 14 is a first jig to which a peak sensor is attached, 15 is a connection portion between the first jig 14 and the upper beam 12, 16 is an arm, and 17 is provided between the tip of the arm 16 and the viaduct pillar 11. The second jig 18, 18 is an arm swinging part, 19 is a two-layer ball bearing constituting the arm swinging part 18, and 20 is a connection point between the second jig 17 and the viaduct pillar 11.

  A hole (not shown) is formed at the tip of the second jig 17 so that the tip of the arm 16 penetrates and engages with the hole. Further, the arm 16 and the peak sensors 13A and 13B are engaged, for example, between two cylindrical bodies fixed to the tip portions of the peak sensors 13A and 13B (see FIG. 4).

  Table 1 shows the specifications of the peak sensor. The dimensions of the peak sensor are, for example, 127 × 18 × 32 mm, the weight is 155 g, the detection range is ± 10 mm, and the resolution is 2 μm.

In FIG. 3, 21 is a case part, 22 is a first movable part, 23 is a second movable part, 24 is a positive side, 25 is a negative side, and 26 is a positive side maximum connected to the first movable part 22. A value detecting mechanism 27 is a potentiometer applied to the positive maximum value detecting mechanism 26, 28 is a negative maximum value detecting mechanism connected to the second movable part 23, and 29 is a potentiometer applied to the negative maximum value detecting mechanism 28. .

  Thus, the peak sensors 13A and 13B can detect and store the maximum displacement amounts of both the positive side 24 and the negative side 25. Here, since the detection range of the peak sensor 13 is ± 10 mm, as shown in FIG. 2, the first jig 14 capable of measuring the member angle θ using the geometrical similarity relationship was used. However, it is predicted that the column end portion of the viaduct pillar 11 vibrates in all directions due to an earthquake. Therefore, as shown in FIG. 4, the arm 16, the peak sensor 13A (arranged in the X direction), and the peak sensor 13B (arranged in the Y direction) are, for example, two cylindrical shapes fixed to the tip of the peak sensor. Since it is configured to engage between the bodies, the displacement in any direction is decomposed into X direction (route direction) and Y direction (direction perpendicular to the route) components, and a maximum response member in two directions with one device A mechanism for measuring corners can be provided.

  When this maximum response member angle measuring device is installed in an actual structure, the connecting portion 15 between the first jig 14 and the upper beam 12 is connected to the second jig 17 and the viaduct pillar 11 at the plastic hinge. The section (location where damage near the base of the RC column member is concentrated) 11A was avoided.

  The backlash and mechanical distortion that occur in the maximum response member angle measurement device can greatly affect the measurement accuracy. Therefore, the rigidity of the first jig 14 to which the ball bearing 19 of the arm swinging portion 18 is installed in two layers or the peak sensor 13 is attached based on the preliminary experiment result by sine wave vibration or circular vibration. For example, the maximum response member angle measuring device is improved.

  Next, the transmission system of the earthquake disaster measurement system of the present invention will be described.

  FIG. 5 is a photograph as a substitute drawing showing an example of a wireless LAN transmission system according to the present invention.

  A transmission system (wireless LAN) that requires immediate data is constructed, and immediately after the disaster, measurement data is transmitted to a command center (for example, civil engineering center).

  In addition, a wireless LAN data transfer system was prototyped (see FIG. 5), and the data obtained from the sensor system 2 was about 100 m at a distance between the transmitter and the receiver of about 100 m and a small number of obstacles. Confirmed that transfer is possible.

  FIG. 6 is a diagram showing an example of a wireless LAN transmission system according to the present invention.

  In this figure, 31 is a sensor system, 32 is a wireless LAN transmission unit that transmits measurement data from the sensor system 31 over a short distance (several tens of meters), and 33 is a short circuit that receives measurement data transmitted from the wireless LAN transmission unit 32. The distance wireless LAN receiving unit 34 is a command station, and 35 is a power source connected to the sensor system 31 and the command station 34.

  Here, the measurement data is sent from the sensor system 31 to the short distance (about several tens of meters) wireless LAN transmitter 32 and then to the short distance wireless LAN receiver 33. Further, it is transmitted to the command station 34 in a relay form by transmission / reception of a long distance (about several hundreds of meters) wireless LAN.

  Further, a transmission system using an RF-ID tag method may be used instead of the wireless LAN method.

  FIG. 7 is a diagram showing an example of a transmission system for an RF-ID tag according to the present invention.

  In this figure, reference numeral 41 denotes a sensor system. Here, each sensor has an ID tag. 42 is an RF-ID tag transmitter that transmits measurement data together with ID information of the sensor from the sensor system 41, and 43 is a portable RF-receiver that receives ID information and measurement data transmitted from the RF-ID tag transmitter 42. An ID tag receiving unit.

  Here, ID information and measurement data from each sensor system 41 are collected by the RF-ID tag receiver 43 via the RF-ID tag transmitter 42.

  Next, the evaluation system according to the present invention will be described.

  In the evaluation system, a damage evaluation method is constructed. Specifically, the relationship between the maximum response member angle and the damage level is ascertained from parameters and represented as a simple standard number table. This standard value is used as a threshold for the damage level of each column.

  Table 2 shows the types of input parameters.

In this way, the concept of the output of the evaluation system (Table 3) to (Table 5) is shown from the setting of the damage level threshold.

In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct of the present invention can accurately measure the degree of damage of the viaduct in a wide range.

It is a schematic diagram of the earthquake disaster measurement system using the system measuring apparatus which measures the maximum response member angle of the viaduct pillar which shows the Example of this invention. It is a schematic diagram of a sensor system showing an embodiment of the present invention. It is a schematic diagram of the peak sensor as a mechanical sensor in FIG. It is the photograph as a substitute drawing which shows the external appearance of the maximum response member angle measuring apparatus which shows the Example of this invention. It is the photograph as a substitute drawing which shows the example of the transmission system of the wireless LAN concerning this invention. It is a figure which shows the example of the transmission system of the wireless LAN concerning this invention. It is a figure which shows the transmission system example of the RF-ID tag concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Viaduct pillar 2,31,41 Sensor system 3 Transmission system 4 Evaluation system 11 Viaduct pillar 11A Plastic hinge area 12 Upper beam 13A 1st peak sensor (arranged in X direction)
13B Second peak sensor (arranged in the Y direction)
DESCRIPTION OF SYMBOLS 14 1st jig | tool 15 Connection location of sensor part and upper layer beam 16 Arm 17 2nd jig | tool 18 Arm rocking | fluctuation part 19 2 layer ball bearing 20 Connection location of 2nd jig | tool and viaduct pillar 21 Case Portion 22 First movable portion 23 Second movable portion 24 Positive side 25 Negative side 26 Positive maximum value detection mechanism 27, 29 Potentiometer 28 Negative maximum value detection mechanism 32 Wireless LAN transmission unit 33 Short range wireless LAN reception unit 34 Command station 35 Power source 42 RF-ID tag transmitter 43 Portable RF-ID tag receiver

Claims (5)

(A) a sensor system for measuring a maximum response member angle in two directions of a viaduct pillar;
(B) a wireless LAN transmission system or an RF-ID tag transmission system for transmitting measurement data from the sensor system;
(C) Seismic disaster measurement using a maximum response member angle measuring device for a viaduct, which includes an evaluation system that takes measurement data transmitted from the transmission system and evaluates the degree of damage of the viaduct system.   2. The maximum response of a viaduct column according to claim 1, wherein the sensor system is arranged about one for each block of the viaduct column. Earthquake disaster measurement system using a member angle measuring device.   The earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct according to claim 2, wherein measurement data is sent from the sensor system to a short-range wireless LAN transmitter, and then to a short-range wireless LAN receiver. An earthquake disaster measurement system using a maximum response member angle measuring device of a viaduct pillar, which is further transmitted to a command station in a relay form by transmission / reception of a long-distance wireless LAN.   The earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct according to claim 2, wherein measurement data is transmitted from the sensor system to a command center using an RF-ID tag system. Earthquake disaster measurement system using the column maximum response member angle measurement device.   2. The earthquake disaster measurement system using the maximum response member angle measuring device for a viaduct according to claim 1, wherein the evaluation system grasps a relationship between a maximum response member angle of the viaduct column and a damage level of the viaduct column. Seismic disaster measurement system using the maximum response member angle measurement device for viaduct columns.