Title:
WATER PERMEABILITY-TESTING DEVICE, AND WATER PERMEABILITY-TESTING METHOD
Document Type and Number:
Japanese Patent JP2015059346
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a water permeability-testing device and a water permeability-testing method, which can reduce the size of the device and easily perform installation work by confining ultrasonic wave in a hollow ultrasonic waveguide and propagating it.SOLUTION: In a water permeability-testing device: water is stored in an ultrasonic waveguide 6 which is a hollow member whose one end is sealed and the another end is opened, and has an inner diameter equal to or less than four times a wavelength of an ultrasonic wave transmitted from an ultrasonic transmitting element provided in the interior on the sealed end side, in a state where the ultrasonic waveguide 6 is inserted into a test hole 3 excavated on a ground 2 with the opened end side faced downwards; an ultrasonic wave U is transmitted from the ultrasonic transmitting element toward the opened end side; a reflection wave R obtained by reflecting the ultrasonic wave U on the water surface in the ultrasonic waveguide 6 to return is received by an ultrasonic receiving element provided in the interior on the sealed end side of the ultrasonic waveguide 6; and the water level in the ultrasonic waveguide 6 is sequentially measured on the basis of a propagation time required from the transmission of the ultrasonic wave U by the ultrasonic transmitting element until the reception of the reflection wave R by the ultrasonic receiving element, thereby the water permeability coefficient of the ground 2 is calculated.
Inventors:
TANAKA KATSUHIKO
FUKAGAWA RYOICHI
FUJIMOTO MASAMITSU
HIRAOKA NOBUTAKA
KUROHARA TAKEHIRO
FUKAGAWA RYOICHI
FUJIMOTO MASAMITSU
HIRAOKA NOBUTAKA
KUROHARA TAKEHIRO
Application Number:
JP2013193946A
Publication Date:
March 30, 2015
Filing Date:
September 19, 2013
Export Citation:
Assignee:
RITSUMEIKAN
International Classes:
E02D1/02; G01N33/24
Domestic Patent References:
| JP2013007725A | 2013-01-10 | |||
| JP2011123012A | 2011-06-23 | |||
| JP2004226232A | 2004-08-12 |
Foreign References:
| US20060042356A1 | 2006-03-02 |
Other References:
平岡 伸隆 ほか: "超音波土中水分・水位計測における周波数特性の検討", 土木学会年次学術講演会講演概要集, vol. 第６６巻, JPN6017030935, 2011, JP, pages 629 - 630, ISSN: 0003622286
Attorney, Agent or Firm:
Mitsuhiko Watanabe