CN110080746A - A kind of compression test equipment and its application method in situ of drilling - Google Patents
A kind of compression test equipment and its application method in situ of drilling Download PDFInfo
- Publication number
- CN110080746A CN110080746A CN201910442296.5A CN201910442296A CN110080746A CN 110080746 A CN110080746 A CN 110080746A CN 201910442296 A CN201910442296 A CN 201910442296A CN 110080746 A CN110080746 A CN 110080746A
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- Prior art keywords
- support rod
- drilling
- loading plate
- pressure
- test equipment
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- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 20
- 238000012669 compression test Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 17
- 238000012360 testing method Methods 0.000 abstract description 10
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004062 sedimentation Methods 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/006—Measuring wall stresses in the borehole
Landscapes
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of drilling compression test equipments in situ, including loading plate, vertically be installed in the support rod of loading plate center, be arranged in support bar top for support rod be continuously applied the pressurizing device of pressure straight down and positioned at pressurizing device side be used for detect loading plate displacement settlement measuring device, the hanging stick perpendicular to support rod is installed on the side wall of the post upper, the settlement measuring device is connected to the top surface of hanging stick.It is pressed by pressurizing device to support rod, utilize the sedimentation deformation of settlement measuring device detection loading plate, so as to the live relationship quickly measured in drilling between the pressure and displacement of soil, convenient for calculating unearthed bearing capacity and compression modulus, the present invention has the advantages that structure is simple and convenient to operate, in-situ test reduces soil disturbance.
Description
Technical field
The present invention relates to the technical fields of geological mapping, more particularly, to a kind of drilling compression test equipment in situ and its make
Use method.
Background technique
Currently, sampled generally at corresponding geologic position when detecting the parameters such as soil bearing capacity or compression modulus,
Then it is tested in laboratory, such method takes soil sample process and the easy disturbed sample structure of transport, needs to carry out depth and repairs
Just, accurate data can be just accessed, and high equipment cost, experimentation are cumbersome.It is existing, it is directly surveyed in hole at the scene
The method of amount includes:
Lateral loading test is a kind of horizontal direction loading test carried out in drilling at the scene.Specific test method is by a cylinder
Other depressor be put into designed elevation in drilling, pressurization is so that other depressor lateral expansion, according to the available drilling of the reading of test
The volume-pressure or curves of stress-strain relationship of lateral magnification can be used to estimate foundation bearing capacity accordingly, measure Soil Parameters,
But high equipment cost.
It is to measure a kind of method of the foundation bearing capacity of sand or cohesive soil at the scene that mark, which passes through test,.This method passes through measurement
The weight of predetermined weight freely hammers ground from a certain certain height, and depth of penetration reaches blow counts when a certain value, should with evaluation
Locate the property and bearing capacity of foundation soil.Usual weight quality takes 63.5 ± 0.5kG, falls away from taking 76 ± 2cm.It is a kind of that mark, which passes through test,
The soil exploration method combined with in-situ test is explored, approximate cohesive soil ground bearing capacity mark can be quickly and easily obtained
Quasi- value.Such method is only applicable in the small drilling of depth, when drilling depth is big, is not suitable for.
Summary of the invention
The first purpose of the invention is to provide a kind of drilling compression test equipments in situ, solve mark and pass through the applicable model of experiment
Small problem is enclosed, has structure simple, it is easy to operate, the advantages of wide adaptation range.
Foregoing invention purpose of the invention has the technical scheme that
A kind of drilling compression test equipment in situ, including loading plate, the vertical support rod for being installed in loading plate center, setting
It is used to be continuously applied support rod the pressurizing device of pressure straight down and is located at pressurizing device side in support bar top and use
It is installed on the settlement measuring device of detection loading plate displacement, the side wall of the post upper perpendicular to the outstanding of support rod
Bar, the settlement measuring device are connected to the top surface of hanging stick.
Pressurizing device is utilized by support rod of the insertion with loading plate in drilling by using above-mentioned technical proposal
Lasting pressure is carried out to support rod, the sedimentation position occurred under the effect of the pressure by loading plate at settlement measuring device detection
It moves, to obtain the relationship between pressure and native compression displacement, convenient for obtaining different depth geology bearing capacity and compression modulus, benefit
In situ measurement can be carried out to the soil body at the construction field (site) with this equipment, obtain the actual experimental data in scene, avoid post depth
Amendment, while the support rod of different length being selected to can adapt to the drilling of different depth, adaptable, the present invention has structure letter
List is applicable in different drilling depths, easy to operate advantage.
The present invention is further arranged to: the pressurizing device be hydraulic jack, the telescopic end of the hydraulic jack with
Support bar top abuts.
By using above-mentioned technical proposal, hydraulic jack force is controllable, can apply and stop at any time pressure to support rod,
It is easy to operate.
The present invention is further arranged to: the settlement measuring device include magnet base, the dial framework being installed on magnet base with
And it is clamped to the amesdial on dial framework, the amesdial includes measuring head, and the measuring head is connected to hanging stick top surface.
By using above-mentioned technical proposal, by magnet base and dial framework by the fixed top for being suspended on hanging stick of amesdial, more
Add stabilization, convenient for detecting the sedimentation deformation of loading plate, precision is higher.
The present invention is further arranged to: pressure-strain piece, the pressure are provided between the pressurizing device and support rod
Foil gauge is connected with for showing that pressurizing device applies the display screen of pressure size.
By using above-mentioned technical proposal, electric signal can be converted for the pressure of hydraulic jack by pressure-strain piece
It is shown on a display screen, so as to the pressure value applied convenient for observation hydraulic jack, more accurately.
The present invention is further arranged to: the support rod is that more leg units are spliced to form, the adjacent leg unit
It is detachably connected, is located at support rod the lowermost leg unit and loading plate consolidates, positioned at described support rod the top
Hanging stick is installed on the side wall of leg unit.
By using above-mentioned technical proposal, it is able to detect the relationship of the pressure of the soil body and displacement at different drilling depths.
The present invention is further arranged to: being arranged at intervals on the outer peripheral surface of the support rod along the length direction of support rod
Multiple locators, the locator include at least two locating rods, and the locating rod is uniformly arranged along support rod is circumferentially-spaced.
By using above-mentioned technical proposal, locator can have the function of in the borehole positioning to support rod, meanwhile, it is fixed
Position device has booster action to support rod, can prevent the support rod when pressurizing device presses from bending
The present invention is further arranged to: the locator is fixed on support rod by fastener, and the locator is installed in tightly
On the lateral wall of firmware, the fastener is held tightly on support rod.
By using above-mentioned technical proposal, be temporarily fixed on support rod by fastener, convenient for locator installation and
Disassembly, can reuse.
The present invention is further arranged to: the fastener is anchor ear, and the locator is fixedly arranged at the lateral surface of anchor ear.
By using above-mentioned technical proposal, locator is fixedly arranged on anchor ear, locator is fixed on by support by anchor ear
On bar, installing and dismounting is more convenient.
A second object of the present invention is to provide a kind of application methods of drilling compression test equipment in situ, including following step
It is rapid:
S1, drilling: drilling to probing region, is drilled into detection position, is inserted into drilling and drills what inner diameter size was adapted to
Casing；
S2, insertion support rod: one end related loading plate of the support rod with loading plate is inserted into together in drilling, wherein transferring
When support rod, the interval setting locator on support rod, until loading plate is connected to drilling bottom；
S3, setting pressurizing device: fixed plate is passed through into the top that support rod is placed on casing, hydraulic jack is placed on support
The top of bar is connected to the telescopic end of hydraulic jack on support rod, and the other end is connected to position and mobile holding force does not occur
In structure, and pressure-strain piece is set between hydraulic jack and support rod；
S4, setting settlement measuring device: dial framework being installed on magnet base, amesdial is clamped on dial framework, magnet base absorption
It is fixed in fixed plate, makes to test the upper surface that head erect is connected to hanging stick；
S5, it measures and records: downward power constantly being applied to support rod by hydraulic jack, then records hydraulic jack
Corresponding displacement in the pressure and amesdial of different phase.
By using above-mentioned technical proposal, this method simple process is easy to operate, and the data measured are more bonded live real
Border geology.
In conclusion advantageous effects of the invention are as follows:
1. being pressed by pressurizing device to support rod, cooperation settlement measuring device detects soil deformation, to obtain pressure
The advantages of relationship between soil deformation has structure simple, easy to operate, wide adaptation range；
2. making support rod can adapt to the ground quality detection of different depth by more leg units of setting；
3. the size of pressure can be accurately obtained by setting pressure-strain piece and display screen, to obtain pressure and sedimentation
Relationship between displacement.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Cross-sectional view when Fig. 2 is use of the invention.
In figure, 1, loading plate；2, support rod；21, hanging stick；22, leg unit；3, hydraulic jack；4, settlement measurement fills
It sets；41, magnet base；42, dial framework；43, amesdial；431, measuring head；5, holding force structure；6, pressure-strain piece；61, display screen；
7, locator；8, anchor ear；9, casing；91, fixed plate.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment one:
It referring to Fig.1, is a kind of drilling compression test equipment in situ disclosed by the invention, including loading plate 1, support rod 2, pressurization dress
It sets and settlement measuring device 4, loading plate 1 is the circular steel plate for being slightly less than drilling internal diameter, drilling internal diameter 1-3cm can be less than.
It is welded with support rod 2 in the center of 1 top surface of loading plate, support rod 2 is provided with perpendicular to loading plate 1, the top of support rod 2
For being persistently continuously applied the pressurizing device of pressure straight down to support rod 2.The side of pressurizing device is provided with for detecting
Loading plate 1 is installed with the hanging stick perpendicular to support rod 2 to the settlement measuring device 4 of bottom offset on the side wall of 2 upper end of support rod
21, hanging stick 21 is the square bar of top surface level, and settlement measuring device 4 is connected to the top surface of hanging stick 21.
Pressurizing device is hydraulic jack 3, is abutted at the top of the telescopic end and support rod 2 of hydraulic jack 3.Hydraulic jack
3 have the advantages of simple structure, light-weight, easy to carry, conveniently moving, are suitble to carrying and using for scene, in use, by liquid
The telescopic end of pressure jack 3 is placed on the top of support rod 2, and at the top of hydraulic jack 3, suspension is fixed with for hydraulic thousand
The holding force structure 5 of 3 holding forces of jin top, holding force structure 5 can be the weights such as the power head of drilling machine or the weight of drilling machine convenient for hydraulic
Holding force when jack 3 downwards exerts a force to support rod 2.
Settlement measuring device 4 includes magnet base 41, the dial framework 42 being installed on magnet base 41 and is clamped to dial framework
Amesdial 43 on 42, amesdial 43 can also be changed to dial gauge, and amesdial 43 includes measuring head 431, when in use, by measuring head
431 pressings are connected to the top surface of hanging stick 21 in order to which when hydraulic jack 3 exerts a force to support rod 2, accurately measurement is held
The distance that support plate 1 settles.
Referring to Fig. 2, for the ease of the pressure that detection hydraulic jack 3 applies support rod 2, in hydraulic jack 3 and branch
Pressure-strain piece 6 is provided between strut 2, pressure-strain piece 6 and external electric are connected to display screen 61, right in hydraulic jack 3
When support rod 2 applies pressure, pressure signal is changed by the display pressurization dress of display screen 61 by electric signal by pressure-strain piece 6
The pressure size of application is set, in order to which the pressure by each stage of hydraulic jack 3 of staff accurately and timely records.
Referring to Fig.1, since the depth to drill when drilling is indefinite, the position for measuring bearing capacity or compression modulus is different, institute
It is unable to satisfy the actual needs at scene with the support rod 2 of single length, sets more leg units 22 for support rod 2, more
Leg unit 22 is mutually spliced to form support rod 2, the length 2-3m of every section leg unit 22, wherein adjacent leg unit 22 it
Between be detachably connected, can for threaded screw bore connect, or flanged joint, the application take threaded screw bore to connect.It is located at
2 the lowermost leg unit 22 of support rod is welded with loading plate 1, on the side wall of the leg unit 22 of 2 the top of support rod
It is welded with hanging stick 21.More piece leg unit 22 is selected, the bearing capacity or compression modulus of drilling different depth can be measured,
It is more practical.
Referring to Fig.1, further, when drilling deeper, since support rod 2 is relatively thin longer, hydraulic jack 3 is to support rod
2 when being downwardly applied to pressure, will lead to support rod 2 and bends, and pressure is consumed, so that the precision of experiment is influenced, so propping up
The length direction of support rod 2 is provided with multiple locators 7 on the outer peripheral surface of strut 2, locator 7 is positioned including at least two
Bar, locating rod are uniformly arranged along support rod 2 is circumferentially-spaced.Locator 7 is fixed on support rod 2 by fastener, locator 7
It is fixed on the lateral wall of fastener, fastener is held tightly on support rod 2.
Fastener is anchor ear 8, and locator 7 is welded on the lateral surface of anchor ear 8, in use, holding tightly anchor ear 8 in support rod
It on 2, is bolted, support rod 2 is placed in drilling, and locator 7 can be connected on the inner wall of drilling, so as to branch
Strut 2 is supported, while also can have positioning action to support rod 2.
Referring to Fig. 2, for the use of compatibility test equipment, when in use, be inserted into casing 9 in drilling, the diameter of casing 9 with
Drilling internal diameter is adapted, and is fallen soil bits to prevent from occurring during experiment collapse hole or hole wall and is influenced the accuracy of experiment.
It is placed with fixed plate 91 on the top of casing 9, fixed plate 91 is iron plate, and support rod 2 passes through in the insertion drilling of fixed plate 91, in reality
Convenient for magnet base 41 to be fixed on iron plate when testing, convenient for placing settlement measuring device 4.
Embodiment two:
It referring to Figures 1 and 2, is a kind of application method of drilling compression test equipment in situ provided by the invention, including following step
It is rapid:
S1, drilling: drilling to probing region, is drilled into detection position, is inserted into drilling and drills what inner diameter size was adapted to
Casing 9 cleans out loosening the soil for drilling hole bottom, to prevent non-undisturbed soil from impacting to experiment；
S2, insertion support rod 2: one end related loading plate 1 of the support rod 2 with loading plate 1 is inserted into together in drilling, wherein
When transferring support rod 2, the anchor ear 8 for being fixed with locator 7 is held tightly on support rod 2 every 1-2m, until loading plate 1 is connected to
Drill bottom；
S3, setting pressurizing device: fixed plate 91 is passed through into the top that support rod 2 is placed on casing 9, hydraulic jack 3 is placed
On the top of support rod 2, it is connected to the telescopic end of hydraulic jack 3 on support rod 2, the other end is connected to position and does not move
In dynamic holding force structure 5, holding force structure 5 is drill power head, and pressure is arranged between hydraulic jack 3 and support rod 2 and answers
Become piece 6；
S4, setting settlement measuring device 4: dial framework 42 is installed on magnet base 41, amesdial 43 is clamped on dial framework 42, magnetic
Power seat 41 is absorbed and fixed in fixed plate 91, presses measuring head 431, measuring head 431 is made to be connected to the upper surface of hanging stick 21 vertically；
S5, it measures and records: downward power constantly being applied to support rod 2 by hydraulic jack 3, then records hydraulic jack
Corresponding displacement in the pressure and amesdial 43 of 3 different phases is pushed up, the displacement of the pressure and generation that are subject to according to soil calculates
Unearthed bearing capacity and compression modulus, more closing to reality do not need to carry out the cumbersome procedures such as the amendment of depth.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of drilling compression test equipment in situ, it is characterised in that: including loading plate (1), be vertically installed in loading plate (1)
The support rod (2) of heart position, setting add at the top of support rod (2) for being continuously applied pressure straight down to support rod (2)
Pressure device and the settlement measuring device (4) for being used to detect loading plate (1) displacement positioned at pressurizing device side, the support rod
(2) hanging stick (21) perpendicular to support rod (2) is installed on the side wall of upper end, the settlement measuring device (4) is connected to hanging stick
(21) top surface.
2. a kind of drilling compression test equipment in situ according to claim 1, it is characterised in that: the pressurizing device is liquid
It presses jack (3), is abutted at the top of the telescopic end and support rod (2) of the hydraulic jack (3).
3. a kind of drilling compression test equipment in situ according to claim 1, it is characterised in that: the settlement measuring device
It (4) include magnet base (41), the dial framework (42) being installed on magnet base (41) and thousand points be clamped on dial framework (42)
Table (43), the amesdial (43) include measuring head (431), and the measuring head (431) is connected to hanging stick (21) top surface.
4. a kind of drilling compression test equipment in situ according to claim 1, it is characterised in that: the pressurizing device and branch
It is provided between strut (2) pressure-strain piece (6), the pressure-strain piece (6) is connected with for showing that pressurizing device applies pressure
The display screen (61) of power size.
5. a kind of drilling compression test equipment in situ according to claim 1, it is characterised in that: the support rod (2) is
More leg units (22) are spliced to form, and the adjacent leg unit (22) is detachably connected, and it is most lower to be located at the support rod (2)
The leg unit (22) at end and loading plate (1) consolidate, and are located on the side wall of the leg unit (22) of the support rod (2) the top
It is installed with hanging stick (21).
6. a kind of drilling compression test equipment in situ according to claim 1, it is characterised in that: the support rod (2)
It is arranged at intervals with multiple locators (7) on outer peripheral surface along the length direction of support rod (2), the locator (7) includes at least
Two locating rods, the locating rod are uniformly arranged along support rod (2) is circumferentially-spaced.
7. a kind of drilling compression test equipment in situ according to claim 6, it is characterised in that: the locator (7) is logical
It crosses fastener to be fixed on support rod (2), the locator (7) is installed on the lateral wall of fastener, and the fastener is held tightly
On support rod (2).
8. a kind of drilling compression test equipment in situ according to claim 7, it is characterised in that: the fastener is anchor ear
(8), the locator (7) is fixedly arranged at the lateral surface of anchor ear (8).
9. a kind of application method of drilling compression test equipment in situ, comprising the following steps:
S1, drilling: drilling to probing region, is drilled into detection position, is inserted into drilling and drills what inner diameter size was adapted to
Casing (9)；
S2, insertion support rod (2): support rod (2) are inserted into drilling with the related loading plate in one end (1) of loading plate (1) together
It is interior, wherein when transferring support rod (2), interval setting locator (7) on support rod (2), until loading plate (1) is connected to brill
Bottom hole；
S3, setting pressurizing device: fixed plate (91) are passed through into the top that support rod (2) are placed on casing (9), by hydraulic jack
(3) it is placed on the top of support rod (2), is connected to the telescopic end of hydraulic jack (3) on support rod (2), the other end abuts
Do not occur in mobile holding force structure (5) in position, and pressure-strain is set between hydraulic jack (3) and support rod (2)
Piece (6)；
S4, setting settlement measuring device (4): dial framework (42) is installed on magnet base (41), amesdial (43) is clamped in table
On frame (42), magnet base (41) is absorbed and fixed on fixed plate (91), and measuring head (431) is made to be connected to the upper of hanging stick (21) vertically
Surface；
S5, it measures and records: downward power constantly being applied to support rod (2) by hydraulic jack (3), is then recorded hydraulic
Corresponding displacement in the pressure and amesdial (43) of jack (3) different phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910442296.5A CN110080746A (en) | 2019-05-24 | 2019-05-24 | A kind of compression test equipment and its application method in situ of drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910442296.5A CN110080746A (en) | 2019-05-24 | 2019-05-24 | A kind of compression test equipment and its application method in situ of drilling |
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| CN110080746A true CN110080746A (en) | 2019-08-02 |
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ID=67421978
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| CN201910442296.5A Pending CN110080746A (en) | 2019-05-24 | 2019-05-24 | A kind of compression test equipment and its application method in situ of drilling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230023924A1 (en) * | 2020-01-08 | 2023-01-26 | Nippon Telegraph And Telephone Corporation | Measuring system and measuring method |
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