JP6530726B2 - Member angle measurement system - Google Patents

Description

  The present invention relates to a member angle measurement system for measuring a member angle generated at an intersection of a first member and a second member which are concrete structures.

  As disclosed in Patent Document 1, there is known an apparatus for measuring the maximum response member angle of a elevated bridge, which stores the maximum value of the member angle generated at the intersection of the upper layer beam of the elevated bridge which is a concrete structure and the column. .

  In this maximum response member angle measurement device, the first jig is fixed to the lower surface of the upper layer beam, and a sensor (peak sensor) capable of measuring the maximum member angle experienced in the jig is attached. Further, the end of the second jig is embedded at a position where the plastic hinge area of the column is removed.

  The second jig is extended substantially parallel to the lower surface of the upper layer beam and has a hole at its tip, and the lower end of the arm connected to the peak sensor is penetrated in the hole. .

  On the other hand, Patent Document 2 discloses a three-axis relative displacement meter capable of measuring displacement in three orthogonal axial directions with one unit, and it is possible to measure displacement of a structure in a space-saving manner. It is stated that it will be.

Patent No. 5064740 Patent No. 4773268 gazette

Ninpei Tatsuya, 3 others, “Influence of loading history of RC elevated bridge column on deformation performance”, Proceedings of the Japan Concrete Institute, Vol. 27, No. 2, 2005, p. 943-948

  However, the measurement result of the peak sensor alone can only grasp the maximum amount of deformation that the concrete structure has received in the past in the measurement direction of the sensor, and can not accurately know the state of the concrete structure after a disaster.

  For example, the maximum deformation of the concrete structure does not necessarily occur along the measurement direction of the sensor, and the largest amount of deformation among all the deformations needs to be measured.

  In addition, in the reinforced concrete column in which the axial rebars are buckled, the deformation performance is reduced, and the remaining load resistance is affected by the response history (see Non-Patent Document 1). That is, even if the measured maximum response displacement is the same, the residual strength may differ due to the difference in response history.

  Therefore, the present invention provides a member angle measurement system capable of grasping the maximum response member angle actually received by the column of the concrete structure, and also grasping the residual strength and the like by the deformation behavior of the time history. The purpose is that.

  In order to achieve the above object, a member angle measurement system according to the present invention is a member angle measurement system for measuring a member angle generated at an intersection of a first member and a second member which are concrete structures, A rod-like arm extending substantially parallel to the inner angular surface of the two members, a measuring unit installed on the inner angular surface side of the first member to measure the inclination of the arm at a predetermined time interval, and the second member A mounting jig for connecting the arm portion in a state of being penetrated through the arm portion on a surface which is projected from the inner corner surface and is substantially parallel to the inner corner surface of the first member, and the measurement value detected by the measuring unit is stored. A storage unit is provided, and in the measurement unit, measurement is performed in at least two directions orthogonal to each other in an inner angular surface of the first member.

  Here, the measurement unit can be configured by two rotary potentiometers arranged in two orthogonal directions. In addition, the configuration may further include a damage degree determination unit that extracts the maximum response member angle generated at the intersection between the first member and the second member from the measurement values stored in the storage unit.

  Furthermore, a configuration may be provided that includes a time history analysis unit that analyzes the time history of the measurement values stored in the storage unit. Moreover, it is preferable that the said measurement part is the structure provided with the trigger mechanism which starts measurement, when a predetermined | prescribed vibration or more is received.

  In the member angle measurement system of the present invention configured as described above, a measurement unit that measures the inclination of the arm at predetermined time intervals in order to measure the member angle generated at the intersection of the first member and the second member. Is equipped. And this measurement part can measure inclination of two directions which intersect perpendicularly in an inside angle side of the 1st member.

  Therefore, even if the second member is inclined in any direction, it appears as a component in the amount of displacement in two orthogonal directions, so that it is possible to grasp the maximum response member angle actually received.

  Furthermore, since it is a measurement part which measures at a predetermined time interval and obtains time history, it is possible to continuously grasp not only the existing maximum value but also the change of the member angle at the time of earthquake. For this reason, by measuring the time history response of the reinforced concrete column, it is possible to grasp the detailed behavior of the column, the residual strength, and the like. Moreover, it becomes possible to grasp the appropriateness of the behavior of the time history of the whole concrete structure at the time of carrying out subsequent reproduction analysis.

  In addition, by configuring the measurement unit that measures displacement amounts in two directions orthogonal to each other by two rotary potentiometers arranged in two directions orthogonal to each other, space can be saved.

  Furthermore, with the configuration provided with the damage degree determination unit that extracts the maximum response member angle from the measurement values obtained at predetermined time intervals, it is possible to quickly determine the damage level received by the concrete structure after the earthquake. .

  In addition, if the time history analysis unit that analyzes the time history of measured values is provided, it will be possible to understand the behavior and residual strength of concrete structures at the time of an earthquake, etc. It can be useful in setting up.

  And, if the measurement unit is equipped with a trigger mechanism that starts measurement when receiving a certain level of vibration, wiring by wires etc is difficult, and even when the measurement unit is operated by a storage battery, it can be measured over a long period of time You can keep

It is a side view explaining the composition of the member angle measurement system of this embodiment. It is a block diagram explaining the composition of the member angle measurement system of this embodiment. It is a wiring diagram explaining composition of a sensor part of a measurement part. It is sectional drawing seen in the AA arrow direction of FIG. It is sectional drawing seen in the BB arrow direction of FIG. It is explanatory drawing which illustrated the time history of the measured value detected by the measurement part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 illustrate the configuration of the member angle measurement system according to the present embodiment. This member angle measurement system is a device that measures a response member angle θ that is a member angle generated near the intersection of a concrete structure.

  The concrete structure may be, for example, the viaduct 1 in which the long beam 11 serving as the first member and the long pillar 12 serving as the second member intersect. The beam portion 11 is an upper beam having a substantially rectangular cross sectional view, and is connected to a stigma of a columnar portion 12 having a substantially rectangular cross sectional view as well.

  The beam portion 11 and the column portion 12 are constructed integrally by reinforced concrete. That is, the viaduct 1 has an RC rigid frame structure. The upper end of the column 12 near the intersection of the concrete beam 11 and the column 12 may be concentrated and damaged if a large horizontal force acts due to a large earthquake or the like. The area which may be plastically deformed by the damage and rotate like a hinge in this manner is defined as a plastic hinge area 12a. The range of the plastic hinge region 12 a differs depending on the shape of the column 12 and the like.

  In the member angle measurement system, for example, the response member angle θ of the column 12 when the column 12 is deformed as shown by the two-dot chain line in FIG. 1 is measured. The relationship between the response member angle θ and the damage level generated in the column 12 due to deformation due to an external force such as a large earthquake has been roughly grasped by previous research.

  In the member angle measurement system of the present embodiment, the measurement unit 3 is installed on the surface (inner surface) of the inner corner of the intersection. Here, the inner angular surface of the beam portion 11 is the lower surface 111, and the inner angular surface of the column portion 12 is the inner surface 121. The lower surface 111 and the inner surface 121 intersect at a substantially right angle. Further, the longitudinal direction of the beam portion 11 is taken as a beam axial direction Y, a direction substantially orthogonal to the beam axial direction Y is taken as a beam width direction X, and the longitudinal direction of the column 12 is taken as a vertical direction Z.

  The member angle measurement system includes a rod-like arm 2 extending substantially parallel to the inner side surface 121 of the column 12, a measurement unit 3 for measuring the inclination of the arm 2 at predetermined time intervals, and a projection from the inner side 121 The arm 2 is mainly composed of a mounting jig 4 connected in a state of being penetrated by the arm 2 in a surface substantially parallel to the lower surface 111 and a storage unit for storing the measured value detected by the measuring unit 3.

  The measurement unit 3 is a device that directly or indirectly measures displacement amounts in at least two directions orthogonal to each other in the lower surface 111 of the beam portion 11. For example, it can be configured by two rotary potentiometers arranged in two orthogonal directions.

  A rotary potentiometer is a sensor that converts mechanical displacement into an electrical quantity like a variable resistor. In a rotary potentiometer, a rotation angle is detected, which can be converted into displacement.

  The measurement unit 3 uses the sensor unit 30 as a Y-axis sensor 31 that measures the inclination (displacement) in the beam axial direction Y, and the X-axis that measures the inclination (displacement) in the beam width direction X substantially orthogonal to the beam axial direction Y And a sensor 32. The Y-axis sensor 31 and the X-axis sensor 32 are both rotary potentiometers.

  The upper end 21 of the arm unit 2 is connected to the sensor unit 30 as shown in FIG. In detail, the connection shaft 331 is connected to the sensor unit 30 via a universal joint 33 which can be tumbled (rotated) in any direction in the plane.

  A joint 332 made of a hexagonal nut or the like is attached to the lower end of the rod-like connection shaft 331, and the upper end 21 of the arm 2 is screwed into the joint 332.

  With such a configuration, when the arm 2 tilts, the tilt causes the universal joint 33 to move through the joint 332 and the connection shaft 331. Then, the sensor unit 30 detects the fluctuation (rotation) of the universal joint portion 33.

  As shown in the wiring diagram of FIG. 3, the Y-axis sensor 31 and the X-axis sensor 32 of the sensor unit 30 are arranged in two directions orthogonal to each other. That is, the inclination (rotation) of the universal joint 33 in the Y-axis direction is detected by the Y-axis sensor 31, and the inclination (rotation) in the X-axis direction is detected by the X-axis sensor 32.

  The sensor unit 30 configured by the Y-axis sensor 31 and the X-axis sensor 32 detects the rotation angle at predetermined time intervals, for example. A block diagram is shown in FIG. 2 in order to explain the system outline of the member angle measurement system of the present embodiment.

  The measurement unit 3 mainly includes a sensor unit 30, a memory unit 36 as a storage unit for storing the measurement value detected by the sensor unit 30, and a control unit 37. In addition to this, a clock unit 303, an A / D converter 304, and the like are provided.

  Electric power serving as an operation source of the measurement unit 3 is supplied from, for example, a battery 381 which is a storage battery. That is, the place where the measurement unit 3 is installed is not limited to the place where the stable power is supplied from the electric wire or the like, and by being operable by the battery 381, it is released from the restriction of the installation place.

  For example, a solar panel 39 may be connected to the battery 381 to charge power generated by solar power generation. Further, the measured value detected by the sensor unit 30 is transmitted to a personal computer or the like disposed at a remote position via, for example, a wireless communication unit 38.

  If the time interval at which the detection by the sensor unit 30 is performed becomes short, continuous measurement is performed. Then, if continuous measurement is performed even when displacement does not occur, the battery 381 is consumed.

  Therefore, a trigger mechanism such as interlocking with an acceleration sensor 302 such as a seismograph can be provided so that continuous measurement is started when a certain or greater seismic intensity occurs.

  Furthermore, the measurement by the sensor unit 30 can be performed also at predetermined time intervals measured by the clock unit 303. The measured value (signal) detected by the sensor unit 30 is temporarily stored in the memory unit 36 configured of a storage medium such as an EEPROM.

  The control unit 37 starts the measurement by the sensor unit 30 in response to the output from the acceleration sensor 302, ends the measurement in response to the output from the clock unit 303, and transmits / receives data via the communication unit 38. Is an arithmetic processing unit that performs control such as

  The control unit 37 can be provided with a damage degree determination unit that extracts the maximum response member angle from the measurement values stored in the memory unit 36. Then, when the maximum response member angle exceeds the predetermined value, the switch of the external contact portion 301 can be turned on to cause the alarm unit 5 to perform notification.

  The alarm unit 5 is a lighting device using, for example, an LED (light emitting diode) as shown in FIG. 1. When the alarm unit 5 is lit, the alarm unit 5 acquires time history of measured values stored in the memory unit 36. It becomes possible to connect to operation.

  The measuring unit 3 is fixed to the lower surface 111 of the beam 11 via the base 34. Further, the sensor unit 30 is accommodated in a box-shaped case unit 351. Further, the lower surface openings of the movable (inclined) connection shaft 331 and the case portion 351 are covered by the bellows-like stretchable cover portion 35. By configuring the sensor unit 30 to be covered by the stretchable cover unit 35 and the case unit 351, the dustproofness and waterproofness of the measurement unit 3 can be enhanced.

  On the other hand, for the arm portion 2, a rod-like member such as a cylinder or a cylinder can be used. For example, a steel rod or a steel pipe having a length of about 500 mm to 2000 mm from the upper end 21 serving as the first end to the lower end 22 serving as the second end can be used as the arm 2. Moreover, it can also be set as the arm part 2 which can be changed into arbitrary length.

  In addition, the mounting jig 4 connected in a state in which the arm portion 2 is penetrated is a projecting plate portion in which a surface which is projected from the inner side surface 121 of the column portion 12 and which becomes substantially parallel to the lower surface 111 of the beam portion 11 is formed. 41, a steel plate portion 43 fixed to the inner side surface 121 of the column portion 12, and a magnet portion 42 for attaching the overhang plate portion 41 to an arbitrary position of the steel plate portion 43.

  The steel plate portion 43 is formed of a substantially rectangular steel plate or the like as shown in FIG. The long side direction of the steel plate portion 43 coincides with the vertical direction Z. Further, the four corners of the steel plate portion 43 are fixed to the inner side surface 121 of the column portion 12 by anchor bolts 431,. The position where the steel plate portion 43 is fixed is, as shown in FIG. 1, a position below the plastic hinge region 12a.

  Then, the projecting plate portion 41 is attached to the steel plate portion 43 by the magnet portion 42. The overhanging plate portion 41 is formed in a substantially L-shape in side view, and the inner corner side is reinforced by being connected by a lateral wand 411.

  The magnet part 42 attached to the back side of the overhang plate part 41 is a known device capable of switching between the adsorption state and the release state by the rotation of the switch. That is, although the magnet unit 42 has a strong adsorptive force, the magnetic field can be controlled by switching the switch, so that the mounting and demounting with respect to the steel plate unit 43 can be easily performed.

  The overhanging plate portion 41 attached to the steel plate portion 43 via the magnet portion 42 moves not only in the column axis direction (vertical direction Z) or the column width direction (beam width direction X) but also in all directions in the steel plate portion 43 plane It can be done easily. Then, the arm portion 2 is passed through the tip end side (the opposite side to the magnet portion 42) of the overhanging plate portion 41.

Next, the installation method of the member angle measurement system of the present embodiment and the operation of the member angle measurement system will be described.
First, as shown in FIG. 1, the measuring unit 3 is attached to the lower surface 111 of the beam 11 near the corner (intersection) of the beam 11 of the viaduct 1 and the column 12 via the base 34. Attach.

  Subsequently, the upper end 21 of the arm portion 2 is fitted into the joint portion 332 from below, and the arm portion 2 is connected to the measuring portion 3. Arm part 2 can also be attached to measurement part 3 beforehand.

  As a result, the arm 2 is suspended from the measuring unit 3 substantially in parallel with the inner side surface 121 of the column 12. Further, the communication unit 38, the battery 381, the alarm unit 5, the solar panel 39 and the like are arranged and connected to the measuring unit 3.

  On the other hand, the steel plate portion 43 is fixed to a position outside the plastic hinge region 12 a with respect to the inner side surface 121 of the column portion 12. The steel plate portion 43 is oriented such that the long side direction is the vertical direction Z, and is fixed to the column portion 12 by the anchor bolts 431,. The overhang plate portion 41 is attached to the steel plate portion 43 fixed to the column portion 12 in this manner.

  With respect to the lower end 22 of the arm portion 2 suspended from the beam portion 11, the overhang plate portion 41 aligns the position with the arm hole (not shown) on the tip end side from below and passes the arm portion 2 The magnet portion 42 is attached to the steel plate portion 43 by adsorbing the magnet portion 42 after being aligned in a direction orthogonal to the arm portion 2.

  In the member angle measurement system according to the present embodiment installed in this manner, the measurement unit 3 on the beam 11 side and the projecting plate 41 on the column 12 side are connected by the arm 2. The overhanging plate portion 41 is attached to the steel plate portion 43 fixed to the inner side surface 121 of the column portion 12 via the magnet portion 42.

  The overhang plate portion 41 attached by the magnet portion 42 can be easily removed simply by rotating the switch even after being attached once, and can be changed while adjusting the position any number of times.

  For this reason, movement of the overhang plate portion 41 is easy, and the member angle measurement system can be installed at a simple and appropriate position with respect to the elevated bridge 1. In particular, the viaduct 1 constructed as a railway, a road, etc. is a linear structure with a long extension, and not all cross sections of the entire length become the same, but cross sections such as curved sections and station sections change variously . If the cross section changes, the range of the plastic hinge region 12a also changes, but the member angle measurement system of this embodiment can be easily installed on any cross section.

  And by the member angle measurement system installed in this way, the measurement of the response member angle θ generated at the corner portion (intersection portion) between the beam portion 11 of the viaduct 1 and the column portion 12 is performed. The response member angle θ is usually measured, for example, once a day.

  That is, as shown in FIG. 2, the time is measured in the clock unit 303, and when the set time elapses, the measuring unit 3 in the sleep state is activated, and for a predetermined time (for example, about 1 minute to 5 minutes) And the measurement by the sensor unit 30 is performed.

  In the sensor unit 30, the rotation angle (deg) in each direction is measured by the Y-axis sensor 31 and the X-axis sensor 32. The measured values are stored in the memory unit 36.

  The measured values stored in the memory unit 36 can be transmitted to a computer or the like in a remote management building via the communication unit 38 each time depending on settings. Also, the administrator can periodically patrol and obtain the data by a portable data collection device (for example, a notebook computer or a tablet terminal) held by the administrator.

  As described above, if measurement is performed once a day for about 5 minutes, the power consumption is small even if continuous measurement is performed at short time intervals, and the battery 381 is not consumed. In addition, since the solar panel 39 is connected to the battery 381, the member angle measurement system can be measured for a long time even in a non-power source where power can not stably be supplied from a wire or the like. be able to.

  On the other hand, when an earthquake occurs, the vibration is detected by the acceleration sensor 302. For example, when the acceleration sensor 302 detects an acceleration greater than or equal to a predetermined magnitude, the measurement unit 3 is activated to perform measurement by the sensor unit 30 for a predetermined time (for example, about 5 minutes). The predetermined acceleration for activating the measuring unit 3 can be set, for example, between 100 gal and 900 gal.

  The measured values measured at the time of earthquake are stored in the memory unit 36. Then, the damage degree determination unit of the control unit 37 extracts the maximum response member angle from among the measurement values stored in the memory unit 36.

  When the maximum response member angle becomes equal to or more than a predetermined value, the external contact portion 301 is turned on to light the alarm portion 5. The lighting of the alarm unit 5 can be a display configuration in which the size of the maximum response member angle can be grasped stepwise. By performing such a display, the administrator performing the patrol can grasp the approximate damage level only by confirming the display level of the alarm unit 5.

  Also, the extracted maximum response member angle can be transmitted via the communication unit 38 to a computer or the like in a remote management building. The manager can quickly determine the damage level received by the viaduct 1 from the maximum response member angle sent during an earthquake.

  Since the response member angle θ measured by the sensor unit 30 of the measurement unit 3 is measured by the two orthogonal Y-axis sensor 31 and X-axis sensor 32 in the orthogonal direction, the largest response member angle θ generated in the plane is It can be grasped from components of two directions orthogonal to each other.

For example, in the case of a measurement unit that measures only the response member angle θ _Y in the beam axial direction Y, only the Y axial component of the member angle generated in directions other than the beam axial direction Y can be measured. Could be

  On the other hand, if it is sensor part 30 which measures inclination of two directions which intersect perpendicularly in undersurface 111 of beam part 11, even if pillar part 12 inclines in any direction, it will be the displacement amount of two directions which intersect at right angles. As it appears as a component, it is possible to accurately grasp the maximum response member angle actually received.

  The measuring unit 3 capable of measuring such displacement amounts in two orthogonal directions is configured by two rotary potentiometers (Y-axis sensor 31 and X-axis sensor 32) mounted in two orthogonal directions. Can be installed in a space-saving manner.

  On the other hand, it is possible to transmit the measured value, which is the time history stored in the memory unit 36, to a computer or the like in a remote management building via the communication unit 38. It can also be acquired by a data collection device.

  The measurement value to be the time history can be analyzed by a time history analysis unit incorporated in a computer or the like in the management building. For example, as disclosed in Non-Patent Document 1, the reinforced concrete column in which the axial rebar is buckled has a reduced deformation performance, and its residual strength is affected by the response history. For this reason, after that, the amount of hysteresis absorbed energy becomes small, and there are cases where the residual resistance can not be grasped only by the maximum response member angle (maximum response displacement). Therefore, the time history analysis unit verifies the detailed behavior of the viaduct 1 at the time of an earthquake, the residual strength, and the like.

  FIG. 6 illustrates an example of measured values of time history. The values which can be grasped by the peak sensor which can measure the maximum member angle are only the largest values of the maximum response member angles M1 and M2. That is, in the peak sensor, when the maximum response member angle larger than the maximum response member angle measured at the previous time occurs, only the maximum response member angle which has been overwritten and the viaduct 1 has received in the past can be grasped.

  On the other hand, if there is time history data TS of the response member angle θ measured, it is possible to continuously grasp not only the history of the maximum value (M1, M2) but also the change of the response member angle θ. Become. As a result, it becomes possible to verify the complex behavior of the viaduct 1 during earthquakes. In addition, it will be possible to understand not only large earthquakes but also the behavior of small and medium-sized earthquakes.

  Then, if the deformation behavior and residual strength of the time history of the viaduct 1 (especially the column 12) are accurately understood by the analysis of the time history analysis unit, it can be used when making a repair plan or operation plan after the earthquake. it can.

  As mentioned above, although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the design change to the extent not departing from the gist of the present invention Included in the invention.

  For example, although a member angle measurement system for measuring the response member angle θ generated in the vicinity of the intersection of the upper beam portion 11 and the stigma of the column portion 12 has been described in the embodiment, the present invention is not limited thereto. For example, the member angle measurement system can be installed so that the response member angle θ generated near the intersection of the column base and the lower beam can be measured.

  Further, in the above embodiment, the rotary potentiometer (31, 32) for measuring the inclination of the arm 2 in two directions by the rotation angle has been described as an example, but it is not limited thereto. The measurement unit may be configured by a sensor that measures the inclination of 2 by displacement.

  Furthermore, in the above embodiment, although the measurement unit 3 operated by the battery 381 has been described, the present invention is not limited to this, and when the power can be secured by an electric wire or the like, the battery 381 or The solar panel 39 can also be omitted.

1 Viaduct (concrete structure)
11 Beam (first member)
111 Bottom (inner corner)
12 pillars (second member)
121 Inner side (inner corner)
2 arm part 3 measurement part 30 sensor part 31 Y axis sensor (rotation potentiometer)
32 X-axis sensor (rotation potentiometer)
36 Memory unit (storage unit)
302 Acceleration sensor (Trigger mechanism)
4 Mounting jig θ Response member angle (member angle)
X Beam width direction Y Beam axis direction

Claims (4)

A member angle measurement system for measuring a member angle generated at an intersection of a first member and a second member which are concrete structures, comprising:
A rod-like arm portion extending substantially parallel to the inner angular surface of the second member;
A measuring unit installed on the inner corner surface side of the first member to measure the inclination of the arm at predetermined time intervals;
A mounting jig configured to connect the arm portion in a state in which the arm portion is penetrated to a surface which is projected from the inner corner surface of the second member and which is substantially parallel to the inner corner surface of the first member;
And a storage unit for storing the measurement value detected by the measurement unit,
Before SL based on the rotation angle detected by the two rotary potentiometers disposed toward the two orthogonal directions in the internal angle surface of the first member, the measurement of the largest response member angle occurring in a plane at each measurement time A member angle measurement system characterized in that it is performed. The damage degree determination part which extracts the largest response member angle | corner which arose at the intersection of the said 1st member and the said 2nd member from the measured value memorize | stored in the said memory | storage part was provided. Member angle measurement system. The member angle measurement system according to claim 1 or 2 , further comprising a time history analysis unit that analyzes a time history of the measurement values stored in the storage unit. The member angle measurement system according to any one of claims 1 to 3 , wherein the measurement unit includes a trigger mechanism that starts measurement when receiving a predetermined vibration or more.