CN108867605B - A kind of vehicle-mounted feeler inspection device - Google Patents
A kind of vehicle-mounted feeler inspection device Download PDFInfo
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- CN108867605B CN108867605B CN201810817844.3A CN201810817844A CN108867605B CN 108867605 B CN108867605 B CN 108867605B CN 201810817844 A CN201810817844 A CN 201810817844A CN 108867605 B CN108867605 B CN 108867605B
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- 238000007689 inspection Methods 0.000 title claims abstract description 39
- 230000003068 static effect Effects 0.000 claims abstract description 124
- 238000005553 drilling Methods 0.000 claims abstract description 53
- 238000009413 insulation Methods 0.000 claims description 20
- 238000007373 indentation Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 37
- 239000003921 oil Substances 0.000 description 24
- 238000000034 method Methods 0.000 description 19
- 238000012360 testing method Methods 0.000 description 15
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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- Analytical Chemistry (AREA)
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- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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Abstract
The present invention relates to a kind of vehicle-mounted feeler inspection devices, including chuck, the chuck hub is provided with kelly, chuck connection pressurization oil cylinder, the bottom of kelly is provided with kelly catcher, and kelly catcher is connect with connection card, and connection card is connect with static sounding bar, the bottom of static sounding bar is provided with static sounding head, and static sounding head is connect by shielded wire with static penetrometer；The chuck is identical as the chuck of drilling machine, and the kelly is connect with truck-mounted drilling rig, and feeler inspection is pressurizeed using pressurization oil cylinder, and kelly is for transmitting pressure；Connection card can be connect with the lifting system of truck-mounted drilling rig, can be pulled out by the lifting system of drilling machine.
Description
Technical field
The present invention relates to engineering geological investigation technical fields, and in particular to a kind of vehicle-mounted feeler inspection device.
Background technique
Feeler inspection is the method for test beds physico-mechanical properties, makes special test probe insertion soil layer, root using external force
According to injection, revolution and the physico-mechanical properties for acting measure of resistance soil property when pulling out.Feeler inspection point has static sounding, dynamic sounding and punching
Hit vibration feeler inspection etc..
Static sounding is the soil layer for being tested probe indentation with press-in device, the injection being unearthed with resistance strain-ga(u)ge measurement
Resistance.Static sounding can determine certain basic physical mechanics properties of soil, such as deformation modulus, the native allowable bearing of soil.
Static sounding pressuring method has mechanical, fluid pressure type and three kinds of manpower type.Static sounding is tested at the scene, by static sounding
The related index of gained specific penetration resistance (Ps) and load test, soil test carries out regression analysis, it is available be suitable for it is certain
The empirical equation of area or certain soil nature can determine that the subsoil of soil carries by the resulting parameter of static sounding
Power.
The basic principle of static sounding is exactly will with quasi- static(al) (for opposite dynamic sounding, no or seldom impact load)
The contact probe of one inside equipped with sensor is to be at the uniform velocity pressed into soil, due to the soft or hard difference of soil various in stratum, suffered by probe
Resistance it is naturally also different, this penetration resistance of different sizes is input in recording apparatus by sensor by electric signal to be remembered
Record is got off, then the qualitative relationships and statistical correlation relationship, Lai Shixian that pass through between penetration resistance and the Engineering Geologic Characteristics of soil take
Soil profile, the engineering geological investigations purpose such as shallow ground bearing capacity is provided, selects bearing course at pile end and estimates bearing capacity of single pile.
Cone Penetration Test is detector to be pressed into soil layer, and measure gross pressure needed for it is pressed into certain depth, is asked
Illustrate the index of soil density and intensity out --- specific penetration resistance P S.Wherein, P: total penetration resistance is Ps=P/A with kilogram
Unit.A: detector bores floor space, as unit of square centimeter.
Static sounding application of result is very wide, can mainly be summarized as following several respects: dividing soil layer；Seek each soil layer engineering
Matter index；Determine pile foundations parameter.
1. dividing soil layer and great soil group differentiating: dividing soil layer according to data of static sounding should sequentially include the following steps:
(1) static sounding probe resistance and depth curve are segmented.The foundation of segmentation is according to various drag sizes and song
Wire shaped carries out comprehensive segmentation.If resistance is compared with the curved section institute that small, frictional resistance is bigger, excess pore water pressure is big, curvilinear motion is small
The soil layer of representative is mostly argillic horizon；And resistance is big, frictional resistance is smaller, excess pore water pressure very little, curve are in saw jumpy
Dentation is then sand.
(2) each soil layer interface depth is accurately determined by concepts such as critical depths.Static sounding is from earth's surface at the uniform velocity penetration process
In, Cone resistance is gradually increased (crust layer influence except), to certain depth (critical depth) after just reach a more steady state value,
Critical depth and the more steady state value section of curve first are first layer；When probe is continued near injection to the second layer, resistance meeting of popping one's head in
By upper and lower soil layer joint effect and change, become larger or become smaller, universal law is positioned at the intermediate deep of curvilinear motion section
Degree is level depth, and the second layer also has more steady state value section, analogizes below.
(3) after above-mentioned two step, then the parameters such as each layer of native probe resistance are subjected to arithmetic average respectively, put down
Mean value can be used to determine soil layer title, and determining soil layer (class) title method can carry out according to various experience figures.Porous static(al) also can be used
Feeler inspection curve seeks site soil layers section.
2. seeking the engineering properties index of soil layer: comparing Experimental Method in Laboratory with the engineering properties index that Cone Penetration Test inquires into soil
Reliably, economical, the period is short, therefore is popular, and application is very wide.The moist degree and force density, calculating that may determine that soil are satisfied
With native force density γsat, calculate soil classifiction parameter, seek foundation soil Basic bearing ability f0, with pore pressure feeler inspection seek saturation
Soil consolidation coefficient and infiltration coefficient etc..
3. the application in stake-base survey: can determine bearing course at pile end and bearing capacity of single pile with static sounding, this be by
It is similar to pile sinking in Mechanism of Static Penetration.Double lumen intubation precision is higher than single bridge probe precision height, in stake-base survey
It can preferentially use.
Feeler inspection device in the prior art when in use, drilling and static sounding cannot same Kong Jinhang, can not achieve roadbed
The synchronous implementation detected with subgrade strength is reconnoitred, the damage area of aperture longevity of service, road pavement is big；Static sounding needs simultaneously
Lower earth anchor process, person works' time long large labor intensity, the accident risk in work is high, and injection pressure and depth of penetration are not
It is enough.
Summary of the invention
The present invention is intended to provide a kind of vehicle-mounted feeler inspection device, improves feeler inspection device in the prior art, realizes
Drilling and the same Kong Jinhang of static sounding, reduce the aperture working time, reduce the damage area of road pavement, reduce personnel's work
Making the time reduces labor intensity, has evaded the accident risk in work, has improved injection pressure and depth of penetration.
The present invention provides a kind of vehicle-mounted feeler inspection device, including chuck, the chuck hub are provided with kelly, chuck
Connection pressurization oil cylinder, the bottom of kelly are provided with kelly catcher, and kelly catcher is connect with connection card, connection card
Connect with static sounding bar, the bottom of static sounding bar is provided with static sounding head, static sounding head by shielded wire with it is quiet
The connection of power cone penetrometer；The chuck is identical as the chuck of drilling machine, and the kelly is connect with truck-mounted drilling rig, and feeler inspection utilizes
The oil cylinder that pressurizes pressurizes, and kelly is for transmitting pressure；Connection card and the lifting system of truck-mounted drilling rig connect, by the promotion of drilling machine
System rises and pulls out.
The pressurization oil cylinder is the oil cylinder on truck-mounted drilling rig.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
In another embodiment, the vehicle-mounted feeler inspection device includes chuck, and the chuck hub is provided with six side's cards,
Connection pressurization oil cylinder on chuck, the bottom of six side's cards are provided with kelly and become silk catcher, and kelly is become by kelly
Silk catcher is connect with short drill pipe, and the length of short drill pipe is less than the length of kelly, and the length of short drill pipe is and pressurization oil cylinder
What stroke was adapted；The bottom of short drill pipe is provided with guide pipe, and guide pipe is internally provided with static sounding bar, guide pipe with it is quiet
It is connected between power sounding rod by hand card；The bottom of static sounding bar is provided with static sounding head, and static sounding head passes through shielding
Conducting wire is connect with static penetrometer, and shielded wire in hollow static sounding bar by passing through, static sounding head and static sounding bar
It is attached by screw thread；The chuck is arranged in drilling machine mould assembling, and the kelly is connect with truck-mounted drilling rig, feeler inspection benefit
With pressurization oil cylinder pressurization, six side's cards are for transmitting pressure；The connection of the compression system of chuck and truck-mounted drilling rig, realizes static sounding bar
It is pressed into or rises and pull out.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
In another embodiment, the vehicle-mounted feeler inspection device includes static sounding bar, the bottom setting of static sounding bar
There is static sounding head, static sounding head is connect by shielded wire with static penetrometer 34；It is provided on static sounding bar solely
Vertical pressurization oil cylinder, the pressurization oil cylinder are driven using the hydraulic system of truck-mounted drilling rig, utilize the self weight of the vehicle of installation truck-mounted drilling rig
As counterforce device, when self weight is unsatisfactory for requiring using screw thread drill bit as earth anchor, the function of static sounding is realized.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
Compared with prior art, the beneficial effect of vehicle-mounted feeler inspection device of the present invention includes:
1, engineering investigation probing is combined the use of method with quiet spy, increases job applications range.
2, two sets of a set of personnel of equipment save personnel and cost of equipment, save transportation cost.
3, earth anchor process under static sounding is avoided: when, less than 5 ton hours, can use truck-mounted drilling rig in static sounding resistance
Self weight carry out pressurization equilibration, reduce person works' time, reduce labor intensity, evaded work in accident risk,
Injection pressure and depth of penetration are improved, provides quantitative parameter Ps and q for subgrade soils prospectingc.(Ps- static sounding ratio passes through
Enter resistance；qcProbe resistance)
4, it is used cooperatively with hand static sounding, has taken into account hand static sounding and adapted to place flexibility.
5, when meeting the impenetrable stratum of static sounding, it can be crept into drilling machine, can continue to use behind the stratum quiet
Power feeler inspection obtains static sounding data.
6, drilling and static sounding are constructed with hole, are reduced the aperture working time, are reduced the damage area of road pavement.
7, live bearing-ratio test is transformed into than (CBR) test principle using the working principle and carrying of I-3 type probe.
The technical solution of three embodiments of the invention can reach above-mentioned seven effects.
The practical method of most convenient, easy to accomplish in the technical solution use of first embodiment, convenient for operation, it is only necessary to increase
Less component just combines probing and feeler inspection.
When the technical solution of second embodiment is better than being that shallow-layer soil layer is hard in place of first embodiment, pressure transfer device
Have the function of that guiding comforts arm, is improved the resistant to bending effect of sounding rod, it is more convenient in subgrade frost heaving disease section use.
The technical solution of 3rd embodiment is better than the stroke for being pressurization oil cylinder in place of first embodiment and second embodiment
With cylinder diameter arbitrarily option and installment, stroke and cylinder diameter former drilling machine oil can be utilized than former drilling machine pressurization cylinder lengthening
Pressure system is, it can be achieved that penetrating power, depth of penetration increase, functionally more approach and static sounding vehicle.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the first embodiment of vehicle-mounted feeler inspection device of the invention.
Fig. 2 is the overall structure diagram of the second embodiment of vehicle-mounted feeler inspection device of the invention.
Fig. 3 is the overall structure diagram of the 3rd embodiment of vehicle-mounted feeler inspection device of the invention.
Specific embodiment
The present invention is described below in more detail to facilitate the understanding of the present invention.
First embodiment:
As shown in Figure 1, vehicle-mounted feeler inspection device of the present invention includes chuck 1 and kelly 2, chuck and pressurization oil cylinder
3 connections, the bottom of kelly are provided with kelly catcher 4, and kelly catcher 4 is connect with connection card 5, connection card 5 and
Static sounding bar 6 connects, and the bottom of static sounding bar is provided with static sounding head 7, static sounding head 7 by shielded wire with it is quiet
Power cone penetrometer 8 connects；The chuck is identical as the chuck of drilling machine, and the kelly is connect with truck-mounted drilling rig, feeler inspection benefit
With pressurization oil cylinder pressurization, kelly is for transmitting pressure；Connection card can be connect with the lifting system of truck-mounted drilling rig, can be by drilling machine
Lifting system rise pull out sounding rod.
The pressurization oil cylinder is the oil cylinder on truck-mounted drilling rig.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
The application method of vehicle-mounted feeler inspection device described in first embodiment of the invention:
It is operated under vehicle, plays tower, perforation of boring machine；
Play tower process:
1, drilling machine is parked in scheduled drilling or feeler inspection hole site, by drilling machine vertical shaft hole and hole location to just.
2, it checks after not blocking in the air, operating stick is pushed into drilling machine position, starts oil hydraulic system.
3, using oil pressure supporting leg, drilling machine is leveled.
4, stagnant band and lifting system are checked, after kelly is tensed, lock lives stagnant band, prevents kelly from playing tower process
Middle swing.
5, ensured safety during tower, it is aerial it is unobstructed after, tower handle, appropriate intensified pressure are boosted, until tower body is flat
It is steady to start to plumbness.
Drill aperture:
Perforation of boring machine is penetrated kelly in chuck and vertical shaft hole to the above 0.5-1.3m in ground, is connected drill bit, is returned
Turn drilling.Aperture is that earth's surface solid bed is drilled to (such as concrete, road surface structare layer, sand, gravelly soil and artificial bed course).
Before aperture, static sounding bar is not connected.Static sounding head connect with shielded wire and penetrates touching
It is normal that feeler lever connect debugging with cone penetrometer.The every root long degree 1m of sounding rod, series connection length meet test depth.
Feeler inspection is pressurizeed using pressurization oil cylinder, and kelly is for transmitting pressure；
After feeler inspection, pulled out by the lifting system of drilling machine.
The advantages of first embodiment is using easy, flexible, efficient.
The disadvantage is that static sounding bar is pliable.
Second embodiment:
As shown in Fig. 2, vehicle-mounted feeler inspection device of the present invention includes chuck 22, the chuck hub is provided with six sides
Card 21, chuck are connect with pressurization oil cylinder 23, and the bottom of six side's cards is provided with kelly and becomes silk 24 (public silks-public affairs silk) of catcher, main
Dynamic drilling rod becomes silk catcher and connect with short drill pipe 25, the length of short drill pipe and the stroke and machine Gao Youguan of pressurization oil cylinder；Short drill pipe
Bottom is provided with guide pipe 26, and guide pipe is internally provided with static sounding bar 27, passes through between guide pipe and static sounding bar
Hand card 28 connects；The bottom of static sounding bar is provided with static sounding head 29, and static sounding head is touched by shielded wire and static(al)
Instrument 8 is visited to connect；The chuck is identical as chuck of rig, and the six Fang Kayu chucks are connected, can by chuck operation valve
Realize the dismounting of six side's cards.Feeler inspection is pressurizeed using pressurization oil cylinder, and short drill pipe is for transmitting pressure；It the injection of static sounding bar and mentions
Rise is realized by the chuck descending operation of drilling machine.
The function of six side's cards is a part of kelly function, and the size of outer diameter and card pipe is consistent with kelly, main
Dynamic drilling rod also selects hexagon.The two is not the same part, is selected under different conditions.Six sides are stuck in chuck and rise admittedly
Position the effect of setting, with chuck synchronize move up and down, between kelly and chuck can synchronize move up and down, can also have on relatively
Lower movement.The rotary motion of drilling tool may be implemented in kelly, and six side's cards can only play transmitting power downward or upward.It is main
The dynamic optional 5.5m of run of steel, six side's card length 20-30cm.Using kelly cannot be used in the scheme of six side's cards.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
The application method of vehicle-mounted feeler inspection device described in second embodiment of the invention:
It is operated under vehicle, has been not required to tower；
The technical solution of first embodiment has needed tower: when earth's surface has solid bed, needing to carry out aperture drilling, Yao Shixian
Kelly must just be used by creeping into function, just need tower using kelly；Because of kelly length about 5.5m, weight is about
500kg need to utilize the lifting system of drilling machine；Lifting system work is completed under conditions of playing tower.
The technical solution of second embodiment has not needed tower, and when earth's surface is without solid bed, static sounding can be with injection, just not
Aperture is needed to creep into；When such situation, kelly is not had to, there is no need to play tower.
Pressure is applied by transmission rod using pressurization oil cylinder, indentation rises and pulls out.Transmission rod is by six side's cards+thread-changing joint (active
Drilling rod becomes silk catcher)+short drill pipe+guide pipe composition；Kelly has transmission rod effect in the technical solution of first embodiment
It is the drilling rod being commonly used that short drill pipe, which is in drilling work, and general drilling machine can be all equipped with, and suitable length can
With general.
Six Fang Kayu thread-changing joints (kelly become silk catcher) are that tool tightens connection, use in as a group
Part；Short drill pipe connect with thread-changing joint, tightens by hand as a component；Guide pipe is as a component and stub boring
Bar connection, is tightened by hand.After three component connections, only plays the transmitting of pressure and pulling force, do not play the biography of torsion
The effect of passing.
The effect of guide pipe: transmitting pressure when injection, pulling force is transmitted when plaing a part of to pull out, while can reduce in injection
Buckling length increases the resistant to bending effect of sounding rod, plays the role of relay cylinder stroke in conjunction with the stroke of oil cylinder.
Compared with first embodiment, the advantages of second embodiment is the bending resistance for improving static sounding bar, is reduced
The process for playing tower.
Guide pipe can be matched with first embodiment.
The kelly thread-changing joint (i.e. kelly catcher) of guide pipe and first embodiment is connected, can be realized
It matches, it is resistant to bending can to play the role of improving sounding rod in first embodiment after matching.
When just connecting sounding rod, feeler inspection resistance is larger, and the length that the sounding rod of indentation bassets is again longer, increases pressure
When entering pressure and will cause feeler inspection rod bending, it just should take and unload the connection card in first embodiment, by guide pipe and actively bore
Bar becomes silk catcher connection, continues injection.
Feature after mating is must both to play tower the shortcomings that summarizing two schemes, and operation is again cumbersome.Advantage is to improve
The use ability of one embodiment and second embodiment protects sounding rod, reduces feeler inspection rod bending.
3rd embodiment:
As shown in figure 3, vehicle-mounted feeler inspection device of the present invention includes static sounding bar 32, the bottom of static sounding bar is set
It is equipped with static sounding head 33, static sounding head is connect by shielded wire with static penetrometer；It is provided on static sounding bar
Independent pressurization oil cylinder 31, the pressurization oil cylinder are driven using the hydraulic system of truck-mounted drilling rig, utilize the vehicle for installing truck-mounted drilling rig
Self weight realizes the function of static sounding when self weight is unsatisfactory for requiring using screw thread drill bit as earth anchor as counterforce device.
The linearity error of the static sounding head is less than ± the 1% of range.
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, decays
Insulation resistance is not less than 100M Ω afterwards.
Three above embodiment realizes following functions:
1, static sounding in-situ test, hydraulic and Manual pressurizing combination are realized.
2, the method that drilling and static sounding are carried out with hole is realized.
3, the synchronous implementation that roadbed prospecting is detected with subgrade strength is realized.
4, existing road is realized under equilibrium humidity state, the method for obtaining CBR parameter.
It 5, is the subgrade resilient modulus providing method under acquisition equilibrium humidity state.
The scheme of three above embodiment can equally realize the combination of static sounding and truck-mounted drilling rig.Static sounding is existing
Form have: static sounding vehicle, crawler type static sounding vehicle, the hand static sounding of manpower.The equipment of these types of type is all
It is mature product, is widely used in engineering investigation field.Also there is more answer in terms of highway, Municipal Road Engineering prospecting
With, but due to the engineering characteristic in the field mostly be circuit homework, region is wide, complex geologic conditions, independent static sounding use by
To limitation.Because static sounding is suitable for fine grained soil stratum.And coarse-grained soil or lithostratigraphy cannot be applicable in, and fine grained soil stratum
It is the stratum that highway and Municipal Road Engineering answer emphasis to reconnoitre again, so using static sounding in conjunction with truck-mounted drilling rig, for road
Stratum in base stress workspace is reconnoitred, is tested, and can achieve the purpose that prospecting and achieve the effect that detection.
1, by static sounding in conjunction with truck-mounted drilling rig, the function of static sounding vehicle not only may be implemented, but also can solve static(al) touching
It visits vehicle and is not suitable for the stratum used, entering difficult region again in vehicle can be surveyed in conjunction with artificial hand static sounding mode
Examination.
It 2, can be by the way of creeping into tested at any time at any time, and same when being reconnoitred to existing road
It is completed in hole.For the Seines types situation for each layer position reconnoitred in stress workspace, using different test methods, so can
Implemented with realizing that roadbed prospecting is synchronous with intensity detection.
3, bearing-ratio test (CBR) refers to filler experiment situation under standard state, rather than roadbed runed 2-3 with
State (the CBR test i.e. under equilibrium humidity state) afterwards.It is wet that balance will be obtained for existing roadbed progress injection pressure test
CBR value under degree state, therefore static sounding and truck-mounted drilling rig are combined into acquisition CBR parameter and provide method.
4, subgrade resilient modulus test is compared with static sounding test, establishes model, it will obtain the modulus of resilience
(E0) static sounding (PSOr qc) relationship, thus for obtain equilibrium humidity state under subgrade resilient amount provide method.
The foregoing describe the preferred embodiment of the present invention, and however, it is not to limit the invention.Those skilled in the art
Improvements and changes without departing from scope and spirit can be carried out to embodiment disclosed herein.
Claims (1)
1. a kind of vehicle-mounted feeler inspection device, which is characterized in that including chuck, the chuck hub is provided with six side's cards, on chuck
Connection pressurization oil cylinder, the bottom of six side's cards are provided with kelly and become silk catcher, and kelly becomes silk by kelly and takes over
It is connect with short drill pipe, the length of short drill pipe is less than the length of kelly, and the length of short drill pipe is the stroke phase with pressurization oil cylinder
It adapts to；The bottom of short drill pipe is provided with guide pipe, and guide pipe is internally provided with static sounding bar, guide pipe and static sounding
It is connected between bar by hand card；The bottom of static sounding bar is provided with static sounding head, static sounding head by shielded wire with
Static penetrometer connection, shielded wire in hollow static sounding bar by passing through, and static sounding head and static sounding bar are by screw thread
It is attached；The chuck is arranged in drilling machine mould assembling, and the kelly is connect with truck-mounted drilling rig, and feeler inspection utilizes pressurization
Oil cylinder pressurization, six side's cards are for transmitting pressure；The compression system of chuck and truck-mounted drilling rig connection, realize static sounding bar indentation or
It rises and pulls out；
The linearity error of the static sounding head is less than ± the 1% of range；
The insulation resistance of the static sounding head is greater than 500M Ω, and static sounding head is decayed using rear insulation resistance, after decaying absolutely
Edge resistance is not less than 100M Ω.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810817844.3A CN108867605B (en) | 2018-07-22 | 2018-07-22 | A kind of vehicle-mounted feeler inspection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810817844.3A CN108867605B (en) | 2018-07-22 | 2018-07-22 | A kind of vehicle-mounted feeler inspection device |
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| CN108867605A CN108867605A (en) | 2018-11-23 |
| CN108867605B true CN108867605B (en) | 2019-06-14 |
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| CN111766364A (en) * | 2019-04-02 | 2020-10-13 | 中国地震局工程力学研究所 | Hidden sensor for in-situ experiment and embedding method thereof |
| CN111879633B (en) * | 2020-06-19 | 2022-09-09 | 东南大学 | Indoor model device for free-fall dynamic sounding test |
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