Displacement measurement apparatus for structure

Patent metadata

Field	Value
Publication number	US-11821815-B2
Application number	US-201917439006-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Mar 26, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

An apparatus includes an acquisition means for acquiring displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of a structure by the weight of a vehicle that travels on the structure, a detection means for detecting the size of the vehicle that passes through the structure and detecting the type of the vehicle from the size, and a control means for controlling the acquisition means on the basis of the detected type of the vehicle.

First claim

The invention claimed is:

1. A displacement measurement apparatus for a structure, the apparatus comprising:
a memory containing program instructions; and
a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
acquire displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of the structure by weight of a vehicle that travels on the structure;
detect a size of the vehicle that passes through the structure, on a basis of an analysis result of determining whether or not a change pattern of a strength and a direction of wind generated along with passage of the vehicle and that is measured by an anemometer is identical or similar to a reference change pattern that is registered and stored in advance;
detect a type of the vehicle from the size; and
control acquisition of the displacement quantity on a basis of the detected type of the vehicle.

2. The displacement measurement apparatus for the structure according to claim 1 , wherein the processor is further configured to:
detect a position and clock time of the vehicle that travels a pre-passage area of the measurement part; and
estimate an arrival time at which the vehicle arrives at the measurement part, from a position of the measurement part and the position and the clock time of the vehicle, and
the acquisition of the displacement quantity is further controlled on a basis of the estimated arrival time.

3. The displacement measurement apparatus for the structure according to claim 2 , wherein
the position and the clock time of the vehicle are detected on a basis of a position of a reference point that is set in the pre-passage area and a detection result by a sensor that detects a clock time that the vehicle passes through the reference point.

4. The displacement measurement apparatus for the structure, according to claim 2 , wherein
estimation of the arrival time includes calculation of a period of time necessary for the vehicle to move from the position of the vehicle to the position of the measurement part at a vehicle speed that is set and stored in advance, and
the arrival time is calculated from the calculated period of time and the detected clock time.

5. The displacement measurement apparatus for the structure, according to claim 2 , wherein the processor is further configured to:
detect speed of the vehicle, and
estimation of the arrival time includes calculation of a period of time necessary for the vehicle to move from the position of the vehicle to the position of the measurement part at the detected speed of the vehicle, and
the arrival time is calculated from the calculated period of time and the detected clock time.

6. The displacement measurement apparatus for the structure, according to claim 2 , wherein
the acquisition of the displacement quantity is controlled such that the acquisition is allowed to be performed during a period from a clock time before the arrival time by a certain period of time to a clock time after the arrival time by the certain period of time.

7. The displacement measurement apparatus for the structure, according to claim 2 , wherein
the acquisition of the displacement quantity is controlled such that an error in the arrival time is calculated, and the acquisition is allowed to be performed during a period from a clock time before the arrival time by the error to a clock time after the arrival time by the error.

8. A displacement measurement apparatus for a structure, the apparatus comprising:
a memory containing program instructions; and
a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
acquire displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of the structure by weight of a vehicle that travels on the structure;
detect a size of the vehicle that passes through the structure, on a basis of an analysis result of determining whether or not a strength of wind generated along with passage of the vehicle and that is measured by an anemometer exceeds a threshold that is set and stored in advance;
detect a type of the vehicle from the size; and
control acquisition of the displacement quantity on a basis of the detected type of the vehicle.

Assignees

• Nec Corp

Inventors

• Nakano Gaku

Classifications

• G01M5/005 Primary

  by means of external apparatus, e.g. test benches or portable test systems · CPC title

• G01M5/0008 Primary

  of bridges · CPC title

• G01M5/0091

  by using electromagnetic excitation or detection · CPC title

• E01D22/00

  Methods or apparatus for repairing or strengthening existing bridges {(electrochemical desalination or re-alkalisation C04B41/00); Methods or apparatus for dismantling bridges} · CPC title

• G01B11/16

  for measuring the deformation in a solid, e.g. optical strain gauge · CPC title