JPS6435207A - Method for measuring thickness of cover over sand layer - Google Patents

Method for measuring thickness of cover over sand layer

Info

Publication number
JPS6435207A
JPS6435207A JP18892587A JP18892587A JPS6435207A JP S6435207 A JPS6435207 A JP S6435207A JP 18892587 A JP18892587 A JP 18892587A JP 18892587 A JP18892587 A JP 18892587A JP S6435207 A JPS6435207 A JP S6435207A
Authority
JP
Japan
Prior art keywords
cover over
sand
sand layer
thickness
constant speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP18892587A
Other languages
Japanese (ja)
Other versions
JPH0476601B2 (en
Inventor
Yutaka Nishikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toa Corp
Original Assignee
Toa Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toa Corp filed Critical Toa Corp
Priority to JP18892587A priority Critical patent/JPS6435207A/en
Publication of JPS6435207A publication Critical patent/JPS6435207A/en
Publication of JPH0476601B2 publication Critical patent/JPH0476601B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • A Measuring Device Byusing Mechanical Method (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

PURPOSE:To measure the thickness of cover over sand layer readily and accurately, by applying a vane testing method, capturing the amount of change in torque, which is generated in a rotary resistor, distinguishing the sand and viscous soil, and using the result for judgement. CONSTITUTION:A measuring instrument 1 is lowered to the bottom of water with a piece of rope 11. A seating plate 2 is seated on the surface of the layer of sand S. A motor 6 is rotated at a constant speed. An impeller unit 8 is rotated in the direction R at a constant speed. The impeller unit 8 is continuously pushed and inserted into the cover over a sand layer by the actions of gears 4 and thread rod 3 in the direction of the thickness T of the cover over the sand layer slowly at a constant speed as shown by an arrow D. The amount of change in torque, which is generated in the rotating impeller unit 8 at this time, is caught as the electric signal of a current value on a working ship 10. The signal is compared with the torque characteristic of standard cover over a sand ground. Thus the thickness T of the cover over the sand layer is determined.
JP18892587A 1987-07-30 1987-07-30 Method for measuring thickness of cover over sand layer Granted JPS6435207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18892587A JPS6435207A (en) 1987-07-30 1987-07-30 Method for measuring thickness of cover over sand layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18892587A JPS6435207A (en) 1987-07-30 1987-07-30 Method for measuring thickness of cover over sand layer

Publications (2)

Publication Number Publication Date
JPS6435207A true JPS6435207A (en) 1989-02-06
JPH0476601B2 JPH0476601B2 (en) 1992-12-04

Family

ID=16232284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18892587A Granted JPS6435207A (en) 1987-07-30 1987-07-30 Method for measuring thickness of cover over sand layer

Country Status (1)

Country Link
JP (1) JPS6435207A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323137A (en) * 2016-09-21 2017-01-11 河南理工大学 River sediment depth measuring device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323137A (en) * 2016-09-21 2017-01-11 河南理工大学 River sediment depth measuring device
CN106323137B (en) * 2016-09-21 2020-05-15 河南理工大学 River silt depth measuring device

Also Published As

Publication number Publication date
JPH0476601B2 (en) 1992-12-04

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