CN208934695U - The focusing system and shield machine of shield machine - Google Patents
The focusing system and shield machine of shield machine Download PDFInfo
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- CN208934695U CN208934695U CN201821305793.8U CN201821305793U CN208934695U CN 208934695 U CN208934695 U CN 208934695U CN 201821305793 U CN201821305793 U CN 201821305793U CN 208934695 U CN208934695 U CN 208934695U
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Abstract
The utility model discloses a kind of focusing system of shield machine and shield machines.Wherein, which includes: current source, emission electrode, bucking electrode, return electrode and current detector, wherein in current source supply in the case where emission electrode and return electrode, shield machine uses first mode emission current；In current source supply in the case where bucking electrode and return electrode, shield machine uses second mode emission current；Wherein, focusing system further include: controller, for the superposition ratio of first mode and second mode being controlled, so that the current value that current detector detects is zero in focusing system emission current by the way of first mode and second mode superposition.The utility model solves the focusing system focused in the related technology using hardware, the technical issues of influencing the measurement accuracy of apparent resistivity, system is be easy to cause to report by mistake.
Description
Technical field
The utility model relates to shield machine fields, in particular to the focusing system and shield machine of a kind of shield machine.
Background technique
In the related art, tunnel electrical method forward probe BEAM (Bore-Tunneling Electrical Ahead
Monitoring) technology is a kind of technology that electrical method is used for tunnel geological forecast, using induced polarization method.?
In this method, ring electrode is laid in face and lays measuring electrode inside front of tunnel heading.By into bucking electrode
Emit a bucking current and a measurement electric current is emitted to measuring electrode, enters current focusing in the rock mass to be detected.
The variation of energy parameter is stored by analyzing related with hole in rock mass electric energy, predict the integrality of front of tunnel heading blindage with
The property of water-bearing.When using BEAM technology, carry out emission current using the cutterhead of shield machine and shield body as emission electrode and bucking electrode.
It under normal circumstances, is all to make emission electrode and bucking electrode by the way of hardware focusing when being focused to emission current
Meet focused condition, rest potential is certainly existed under the hardware type of focusing, measurement view electricity can be reduced to a certain extent in this way
The precision of resistance rate；In addition, emission electrode and bucking electrode are conductings, do not do and insulate, emission electrode and bucking electrode it
Between pressure difference it is extremely faint, this requires system have very high weak-signal measurement ability.Therefore, using the hardware type of focusing
When, the precision of BEAM systematic survey apparent resistivity will receive large effect, so as to will lead to the feelings such as geologic interpretation wrong report
Condition.
For above-mentioned problem, currently no effective solution has been proposed.
Summary of the invention
The utility model embodiment provides the focusing system and shield machine of a kind of shield machine, at least to solve the relevant technologies
The middle focusing system focused using hardware, the technical issues of influencing the measurement accuracy of apparent resistivity, system is be easy to cause to report by mistake.
According to the one aspect of the utility model embodiment, a kind of focusing system of shield machine is provided, comprising: electric current
Source, the emission electrode on the cutterhead of shield machine, the bucking electrode on the shield of shield machine, the emission electrode and shielding electricity
The return electrode of pole, the current detecting that the electric current on the conductor between the emission electrode and the bucking electrode is detected
Device, wherein in the current source supply in the case where emission electrode and the return electrode, the shield machine is using the
One Mode Launch electric current；In the current source supply in the case where bucking electrode and the return electrode, the shield
Machine uses second mode emission current；Wherein, the focusing system further include: controller, for being used in the focusing system
When the first mode and the mode emission current of second mode superposition, the folded of the first mode and second mode is controlled
Add ratio, so that the current value that the current detector detects is zero.
Optionally, the focusing system further include: provide the reference electricity of potential reference for the current potential on the bucking electrode
The current potential under the first mode and under the second mode on the emission electrode is surveyed according to the reference electrode in pole
The tension measuring circuit of amount, to what is measured under the first mode with the total current of the shield machine under the second mode
Total current measuring circuit and processor, wherein the processor, the current potential for being measured according to the tension measuring circuit,
The electric current that the electric current and the current detector of the total current measuring circuit measurement detect, determines that the shield machine is surveyed
The apparent resistivity on stratum.
Optionally, the controller is also used to the current potential measured according to the tension measuring circuit, the total current measurement
The electric current that the electric current of circuit measuring and the current detector detect generates and supplies the emission electrode and the bucking electrode
The transmitting signal of transmitting.
Optionally, the focusing system includes: transmit circuit, wherein the transmit circuit is used to produce the controller
The raw transmitting signal carries out power amplification, and the signal of power amplification is supplied to the emission electrode and shielding electricity
Pole.
Optionally, the processor includes: processing unit, wherein the processing unit for determining in the following manner
The apparent resistivity of shield machine institute geodetic layer:
Wherein, Ra is the apparent resistivity, and K is electrode coefficient, and V0 is the electricity of the emission electrode under the first mode
Position, I are the total current of the shield machine under the first mode, and I1 is the total current point of the shield machine under the first mode
To the electric current of the bucking electrode, V0 ' is the current potential of the emission electrode under the second mode, and I0 ' is the second mode
Under the total current of the shield machine assign to the electric current of the emission electrode.
Optionally, the controller includes: control unit, wherein described control unit, for passing through the first electric current of control
It is controlled with the mode of the ratio of the second electric current and described is superimposed ratio, wherein first electric current is described under the first mode
The total current of shield machine assigns to the electric current of the bucking electrode, and second electric current is the shield machine under the second mode
Total current assigns to the electric current of the emission electrode.
Optionally, the tension measuring circuit includes: amplifier, filter and analog-digital converter, wherein the amplification
Device, for being amplified to current potential collected on the bucking electrode；The filter, for amplifying to the amplifier
Current potential be filtered；The analog-digital converter, for the analog signal of the current potential obtained after filtering to be converted to digital signal.
Optionally, the current detector includes at least one of: Rogowski coil, current transformer, and fibre-optic current passes
Sensor.
Optionally, the current transformer has magnetic core.
According to the other side of the utility model embodiment, a kind of shield machine, including any one of above-mentioned institute are provided
The focusing system for the shield machine stated.
In the utility model embodiment, current source, to the emission electrode on the cutterhead as shield machine, the shield of shield machine
The return electrode of bucking electrode on shield, emission electrode and bucking electrode, on the conductor between emission electrode and bucking electrode
The electric current current detector and controller that are detected, wherein in current source supply in emission electrode and return electrode
In the case of, shield machine uses first mode emission current；In current source supply in the case where bucking electrode and return electrode, shield
Structure machine uses second mode emission current；The system when emission current, is controlled by the way of first mode and second mode superposition
The superposition ratio of first mode processed and second mode, so that the mode that the current value that current detector detects is zero, by making
The electric current on conductor between above-mentioned emission electrode and bucking electrode is zero, has reached the residue for making emission electrode and bucking electrode
The purpose that current potential is zero improves the measurement accuracy of apparent resistivity to realize the focusing effect of optimization focusing system, reduces system
The technical effect of system wrong report probability, and then solve the focusing system focused in the related technology using hardware, influence apparent resistivity
Measurement accuracy, the technical issues of be easy to causeing system to report by mistake.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings:
Fig. 1 is the structural schematic diagram according to a kind of focusing system of shield machine of the utility model embodiment；
Fig. 2 is the structural schematic diagram according to the first mode circuit of the utility model embodiment preferred embodiment；
Fig. 3 is the structural schematic diagram according to the second mode circuit of the utility model embodiment preferred embodiment；
Fig. 4 is the superimposed electric field of first mode and second mode according to the utility model embodiment preferred embodiment
Schematic diagram；
Fig. 5 is the structural schematic diagram according to the digital focus circuit of the utility model embodiment preferred embodiment.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model a part, instead of all the embodiments.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts is all answered
When the range for belonging to the utility model protection.
It should be noted that the specification and claims of the utility model and term " first " in above-mentioned attached drawing,
" second " etc. is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that in this way
The data used are interchangeable under appropriate circumstances, so that the embodiments of the present invention described herein can be in addition at this
In illustrate or description those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, meaning
Figure be to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units
Those of be not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes,
The intrinsic other step or units of method, product or equipment.
Development and shield machine producer independent research shield machine with the large-scale construction project such as domestic railway, highway and water conservancy
The promotion of ability, it is higher and higher using the ratio of shield-tunneling construction in constructing tunnel.In shield-tunneling construction, when encountering crushed zone, molten
When the water-bearing structures such as hole, underground river, often will cause water bursting disaster causes machine breakdown, engineering extension or even casualties etc. tight
Weight accident.In order to avoid the generation of above-mentioned accident, the method for advance geologic prediction is generallyd use to front of tunnel heading geological condition
It is detected, and reasonable construction prediction scheme and treatment measures is pre-established according to the result of measurement and evaluation.
Drilling and blasting method is a kind of common methods of tunnelling, be by drilling, powder charge, Blasting Excavation rock method,
During drill bursting construction, the ground situation in front of face (that is, tunnel piercing face) is carried out analyzing detection, for
Different Rock Conditions perform corresponding processing, and otherwise easily cause the generation of safety accident.Poorly for water-bearing structure etc.
The detection of plastid generallys use transient electromagnetic method, geological radar method and induced polarization method in drilling and blasting method.Due to being applied by shield
Shield machine occupies entire tunnel face space of planes in work, and shield-tunneling construction environment electromagnetics interfere the limitation of the actual conditions such as big,
Transient electromagnetic method and geological radar method are difficult to use in shield-tunneling construction.
It is right in using shield machine (or TBM (rock tunnel(ling) machine, Tunneling Boring Machine)) work progress
When the aqueous equal undesirable geologic body of construction is detected, BEAM technology is generally used.When using the BEAM technology, respectively with shield
The cutterhead and shield body of structure machine carry out emission current as emission electrode and bucking electrode, focusing and control system in same phase bucking current
Altogether under same-action, satisfaction flows through the focused condition that the electric current of base bearing is zero, and emission current is forced to flow to front of tunnel heading, this
True resistivity and sharp electrical characteristics value of the apparent resistivity and parameters of electrical induction measured under kind state closer to front of tunnel heading geologic body.
The effectively apparent resistivity on measurement front of tunnel heading stratum, predicts front of tunnel heading geological condition.
In the utility model embodiment, for ease of description, following shield machine can be understood as shield machine (or
TBM)。
According to the utility model embodiment, a kind of system embodiment of the focusing system of shield machine is provided, needs to illustrate
, step shown in the flowchart of the accompanying drawings can hold in a computer system such as a set of computer executable instructions
Row, although also, logical order is shown in flow charts, and it in some cases, can be to be different from sequence herein
Execute shown or described step.
Fig. 1 is according to a kind of structural schematic diagram of the focusing system of shield machine of the utility model embodiment, such as Fig. 1 institute
Show, which includes: current source 11, emission electrode 12, bucking electrode 13, return electrode 14, current detector 15, and
Controller 16.The focusing system is described in detail below.
Current source 11, the emission electrode 12 on the cutterhead of shield machine, the bucking electrode 13 on the shield of shield machine, transmitting electricity
The return electrode 14 of pole 12 and bucking electrode 13, examines the electric current on the conductor between emission electrode 12 and bucking electrode 13
The current detector 15 of survey, wherein in the case where current source 11 is powered at emission electrode 12 and return electrode 13, shield machine is adopted
With first mode emission current；In the case where current source 11 is powered at bucking electrode 14 and return electrode 13, shield machine is used
Second mode emission current；Wherein, focusing system further include: controller 16, in focusing system using first mode and the
When the mode emission current of two modes superposition, the superposition ratio of first mode and second mode is controlled, so that current detector 15
The current value detected is zero.
By above system, which includes current source, to the emission electrode on the cutterhead as shield machine, shield
The return electrode of bucking electrode on the shield of machine, emission electrode and bucking electrode, between emission electrode and bucking electrode
The current detector and controller that electric current on conductor is detected, wherein in current source supply in emission electrode and reflux
In the case where electrode, shield machine uses first mode emission current；In current source supply in the feelings of bucking electrode and return electrode
Under condition, shield machine uses second mode emission current；The system emits electricity by the way of first mode and second mode superposition
When stream, the superposition ratio of first mode and second mode is controlled, so that the mode that the current value that current detector detects is zero,
By making the electric current zero on the conductor between above-mentioned emission electrode and bucking electrode, having reached makes emission electrode and bucking electrode
Rest potential be zero purpose, thus realize optimization focusing system focusing effect, improve the measurement accuracy of apparent resistivity,
Reduction system reports the technical effect of probability by mistake, and then solves the focusing system focused in the related technology using hardware, influences to regard
The measurement accuracy of resistivity, the technical issues of be easy to causeing system to report by mistake.
Above-mentioned current source is used to be powered with return electrode or bucking electrode with return electrode for emission electrode, from
And make to be formed into a loop between above-mentioned emission electrode and return electrode or between bucking electrode and return electrode.In the present embodiment
In, above-mentioned emission electrode is located on the cutterhead of shield machine, which can be any electric conductor on cutter head of shield machine, example
Such as, the cutterhead of shield machine, the combination of cutter or cutterhead and cutter on the cutterhead of shield machine.Above-mentioned bucking electrode is located at shield
On the shield of structure machine, which can be any electric conductor on shield machine shield, for example, the shield of shield machine.It is above-mentioned
It is formed into a loop between return electrode ground connection and above-mentioned emission electrode and/or bucking electrode, thus before forming electric field detection face
The apparent resistivity of the ground of side.The return electrode be any electric conductor, with emission electrode and/or bucking electrode circuit connection and
Ground connection.
Above-mentioned first mode be above-mentioned current source simultaneously emission electrode and return electrode are powered, return electrode with
It is formed into a loop between above-mentioned emission electrode, to form electric field.The power supply total current of current source is I, and electric current flows into cutterhead and (sends out
Radio pole) after be divided into two parts, one part of current I0 flows directly into stratum and returns to return electrode, and another part electric current I1 is through electric current
Detector (i.e. coil) flows into bucking electrode (i.e. shield), is then returning to return electrode by stratum.
Above-mentioned second mode be above-mentioned current source simultaneously bucking electrode and return electrode are powered, return electrode with
It is formed into a loop between above-mentioned bucking electrode, to form electric field.The power supply total current of current source is I ', and electric current flows into shield (i.e.
Bucking electrode) after be divided into two parts, one part of current I1 ' flows directly into stratum and returns to return electrode, another part electric current I0 ' warp
Current detector (i.e. coil) flows into emission electrode (i.e. cutterhead), is then returning to return electrode by stratum.
In conjunction with above-mentioned first mode and second mode, when flowing to bucking electrode from emission electrode in the first mode, flow through
The electric current of current detector (i.e. coil) is I1, when flowing to emission electrode from bucking electrode in a second mode, flows through electric current inspection
The electric current for surveying device (i.e. coil) is the contrary big in above-mentioned electric current I1 and electric current I0 ' of I0 ', above-mentioned electric current I1 and electric current I0 '
In small identical situation, influence of the two to electric field is cancelled out each other, so that the electric field quilt generated by bucking electrode and emission electrode
Compel to flow to stratum to be measured, by the superposition to above two mode, effectively improves the focusing capability that shield machine generates electric field.
Optionally, focusing system further include: the reference electrode of potential reference is provided for the current potential on bucking electrode, according to ginseng
The tension measuring circuit that electrode measures the current potential under first mode and under second mode on bucking electrode is examined, to the first mould
The total current measuring circuit and processor measured under formula with the total current of shield machine under second mode, wherein processing
Device, the current potential for being measured according to tension measuring circuit, the electric current of total current measuring circuit measurement and current detector detection
The electric current arrived determines the apparent resistivity of shield machine institute geodetic layer.
The apparent resistivity of above-mentioned shield machine institute geodetic layer can be the view electricity of the ground in the front of face in front of shield machine
Resistance rate.Above-mentioned reference electrode is any electric conductor or unpolarizable electrode, the benchmark for the current potential as measurement emission electrode.
Above-mentioned unpolarizable electrode is commonly called as pole tank, is the device for being used to receive electric signal in electrical prospecting, is a kind of special measurement current potential
The grounding electrode of difference, can be such that polarization of electrode potential difference is reduced within 1mV, effectively reduce the polarization electricity of measuring electrode
Potential difference, because of referred to herein as unpolarizable electrode.Therefore, the current potential for measuring above-mentioned emission electrode using reference electrode is more accurate, error
It is smaller.
The voltage that the current potential under first mode and under second mode on bucking electrode measures is surveyed according to reference electrode
Measure circuit.In the flrst mode, the circuit first voltage between reference electrode and emission electrode is measured using tension measuring circuit,
Above-mentioned first voltage is the potential difference of reference electrode and emission electrode.The current potential of reference electrode it is known that above-mentioned reference electrode electricity
Position generally zero, or other fixed values.It can be calculated and be set out according to the potential value of reference electrode and above-mentioned first voltage
The current potential of radio pole in the flrst mode.It is under the second mode, identical as the emission electrode measuring principle under above-mentioned first mode,
The circuit second voltage between reference electrode and emission electrode can be measured using tension measuring circuit, according to above-mentioned second electricity
The potential value of pressure and reference electrode, can calculate the potential value of emission electrode under the second mode.
To under first mode and the total current of shield machine measures under second mode total current measuring circuit, above-mentioned
Electric field strength under one mode and under second mode exports current related with current source.Existed using above-mentioned total current measuring circuit
It is measured under first mode and to the total current of above-mentioned current source output under second mode.For example, under above-mentioned first mode
The power supply total current I ' of current source under the power supply total current I and second mode of current source.
Optionally, controller is also used to the current potential measured according to tension measuring circuit, the electricity of total current measuring circuit measurement
The electric current that stream and current detector detect generates the transmitting signal emitted for emission electrode and bucking electrode.
Above-mentioned transmitting signal is the electric signal that can produce electric field for emission electrode and bucking electrode transmitting, needs to illustrate
, which can be different form in different phase, for example, exporting the transmitting signal, the transmitting in controller
Signal is generally weak electric signal, is firing order, is used to indicate device and carries out transmitting relevant action；In bucking electrode and/or hair
When penetrating the electrode emission transmitting signal, which is generally forceful electric power signal, for generating the electric field of some strength.In this reality
It applies in example, according to the current potential that tension measuring circuit measures, the electric current of total current measuring circuit measurement and current detector detection
The electric current arrived, generates the transmitting signal emitted for emission electrode and bucking electrode, and the firing order that above-mentioned control issues can wrap
Include transmitting signal intensity, emit the duration of signal, etc. parameters.
Optionally, focusing system includes: transmit circuit, wherein transmit circuit is used for the transmitting signal generated to controller
Power amplification is carried out, and the signal of power amplification is supplied to emission electrode and bucking electrode.
In the present embodiment, the transmitting signal that above-mentioned transmit circuit is used to generate controller carries out power amplification, and will
The signal of power amplification is supplied to emission electrode and bucking electrode includes: that transmit circuit receives the firing order letter from controller
Number, a series of processing are made according to the emission instruction signal, to generate the hair that can emit for emission electrode and bucking electrode
Penetrate signal.A series of above-mentioned processing include noise reduction, enhancing, amplification etc. signal processing technology.
Optionally, processor includes: processing unit, wherein processing unit is by by based on according to above-mentioned apparent resistivity
Calculate the apparent resistivity that formula following manner determines shield machine institute geodetic layer:
Wherein, Ra is apparent resistivity, and K is electrode coefficient；V0 is the current potential of emission electrode under first mode, according to first mode
Under tension measuring circuit measure obtain；I is the total current of shield machine under first mode, is measured according to total current under first mode
Circuit measuring obtains；I1 is that the total current of shield machine under first mode assigns to the electric current of bucking electrode, according to electric under first mode
Current sensor detection obtains；V0 ' is the current potential of emission electrode under second mode, is surveyed according to the tension measuring circuit under second mode
Amount obtains；I0 ' is that the total current of shield machine under second mode assigns to the electric current of emission electrode, is examined according to the electric current under second mode
Device detection is surveyed to obtain.
Optionally, controller includes: control unit, wherein control unit, for passing through the first electric current of control and the second electricity
The mode of the ratio of stream controls superposition ratio, wherein the first electric current is that the total current of shield machine under first mode assigns to emitting panel
The electric current covered, the second electric current are that the total current of shield machine under second mode assigns to the electric current of emission electrode.
When above-mentioned first mode and second mode are overlapped, according to electric field superposition principle, first mode and second mode
It is superimposed to form synthesis model with certain proportion, it is assumed that the ratio is 1: λ, then has:
Wherein, the current potential on emission electrode is V0+ λ V0 ', and the electric current for flowing into stratum from emission electrode is I0+ λ I0 '.Work as I1
=λ I0 ', i.e.,The electric current that the conductor between emission electrode and bucking electrode is flowed through under synthesis model is zero.In above formula,
I1 is that the total current of shield machine under first mode assigns to the electric current of bucking electrode, and I0 ' is the total current of shield machine under second mode
Assign to the electric current of emission electrode.
Optionally, tension measuring circuit includes: amplifier, filter and analog-digital converter, wherein amplifier, for pair
Collected current potential amplifies on the shield electrode；Filter, for being filtered to the current potential that amplifier amplifies；Modulus turns
Parallel operation, for the analog signal of the current potential obtained after filtering to be converted to digital signal.
The measurement result of above-mentioned tension measuring circuit wants input processor, and processor generally passes through digital signal and counted
It calculates, therefore the analog signal of the measurement result of above-mentioned tension measuring circuit can be converted into digital letter using analog-digital converter
Number.Filter improves signal accuracy rate and accuracy, is convenient for subsequent processing mode except making an uproar.
Optionally, current detector includes at least one of: Rogowski coil, current transformer, fibre optic current sensor.
Above-mentioned current detector is used to detect the electric current on the conductor between emission electrode and bucking electrode, is led due to above-mentioned
Body is cylinder, and volume is larger, can not directly be measured with electric current detecting instrument, therefore generally use Rogowski coil to be surveyed
Amount can also be measured using current transformer or fibre optic current sensor.It should be noted that using above-mentioned Roche
When coil measures, Rogowski coil is covered on above-mentioned conductor, when flowing through electric current on above-mentioned conductor, Rogowski coil be can detecte
It arrives.
Optionally, current transformer has magnetic core.In the present embodiment, preferably with the current transformer of magnetic core.
It should be noted that a kind of digital focus method for being used for shield machine (or TBM) is present embodiments provided, as this
The preferred embodiment of embodiment, specific as follows:
The cutterhead of shield machine (or TBM) is as emission electrode A0 electrode, and the shield of shield machine (or TBM) is as bucking electrode
A1 electrode, Rogowski coil are mounted between cutterhead and shield as current measurement coil, and return electrode B and reference electrode N are placed
On the earth anchor at rear shield machine (or TBM) (for example, rear 300m-500m is remote).Digital focus embodiment is as follows:
Mode 1: Fig. 2 is the structural representation according to the first mode circuit of the utility model embodiment preferred embodiment
Figure, as shown in Fig. 2, powering to cutterhead (A0 electrode) and B electrode, power supply total current is I, and electric current is divided into two after flowing into cutterhead
Point, one part of current (I0) flows directly into stratum and returns to B electrode, and another part electric current (I1) flows into shield (A1 through Rogowski coil
Electrode), stratum is then flowed into again returns to B electrode.There is an I=I0+I1 according to Kirchhoff's current law (KCL), and the current source will be
The current potential V0 of opposite N electrode is generated on A0 electrode.
Mode 2: Fig. 3 is the structural representation according to the second mode circuit of the utility model embodiment preferred embodiment
Figure, as shown in figure 3, powering to shield (A1 electrode) and B electrode, power supply total current is I ', and electric current is divided into two after flowing into shield
Part, one part of current (I1 ') flow directly into stratum and return to B electrode, and another part electric current (I0 ') flows into cutterhead through Rogowski coil
(A0 electrode) then flows into stratum again and returns to B electrode.There are I '=I0 '+I1 ', and the electric current according to Kirchhoff's current law (KCL)
Source will generate current potential V0 ' on A0 electrode.
Synthesis model: according to electric field superposition principle, mode 1 is superimposed formation synthesis mould with mode 2 with certain proportion (1: λ)
Formula.Compositive relation is shown below:
Current potential under synthesis model on A0 electrode is V0+ λ V0 ', and the electric current for flowing into stratum from A0 electrode is I0+ λ I0 '.When
When I1=λ I0 ', i.e.,When, flowing through the electric current of Rogowski coil under synthesis model is zero, and synthesis model work is focusing shape
State, A1 electrode is equal with A0 electrode potential, and the electric current that the electric current of A1 electrode outflow forces A0 electrode to flow out enters perpendicular to cutterhead
Stratum in front of it, as shown in Figure 4, wherein Fig. 4 be according to the first mode of the utility model embodiment preferred embodiment and
The schematic diagram of the superimposed electric field of second mode.
At this point, apparent resistivity can be expressed by following formula:
Wherein, Ra is electrode coefficient to be surveyed formation apparent resistivity, K.
This preferred embodiment additionally provides a kind of digital focus circuit, specific as follows:
Fig. 5 is according to the structural schematic diagram of the digital focus circuit of the utility model embodiment preferred embodiment, such as Fig. 5
Shown, digital focus circuit includes acquisition/control circuit, transmit circuit, total current measuring circuit, tension measuring circuit, Roche
Coil, integrating circuit, Rogowski coil current measurement circuit, shield machine (or TBM) cutterhead A0 electrode, shield machine (or TBM) shield
A1 electrode, B electrode, N electrode.
Above-mentioned acquisition/control circuit major function has: 1) acquisition of total current, voltage, Rogowski coil electric current, and 2) to three kinds
The acquisition parameter of the measuring circuit of signal is controlled, 3) it generates and transmits signals to transmit circuit.
Above-mentioned transmit circuit receives the transmitting signal that acquisition/control circuit generates, and carries out power amplification to transmitting signal, will
Signal supply A0~B electrode or A1~B electrode after power amplification.
Above-mentioned total current measuring circuit picks up total emission current, which is amplified, is filtered, after A/D conversion, is given
Acquisition/control circuit is acquired.
Above-mentioned tension measuring circuit picks up current potential of the A0 electrode with respect to N electrode, which is amplified, is filtered, A/D turns
After changing, gives acquisition/control circuit and be acquired.
Above-mentioned Rogowski coil, integrating circuit and Rogowski coil current measurement circuit, which are responsible for picking up, flows through A0 electrode and A1 electrode
Between electric current, which is amplified, is filtered, A/D conversion after, give acquisition/control circuit and be acquired.
The cutterhead and the cutter on cutterhead that above-mentioned A0 electrode includes: shield machine (or TBM), as principal current emission electrode.
Above-mentioned A1 electrode includes: the shield of shield machine (or TBM), as bucking electrode.
Above-mentioned B electrode can be the conductors such as metal ground anchor, as A0 electrode, the return electrode of A1 electrode.
Above-mentioned N electrode can be the conductors such as metal ground anchor or unpolarizable electrode, the reference electrode as voltage measurement.
According to the other side of the utility model embodiment, a kind of shield machine is provided, including any one of above-mentioned
The focusing system of shield machine.
Above-mentioned the utility model embodiment serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
In the above embodiments of the present invention, all emphasize particularly on different fields to the description of each embodiment, in some embodiment
The part not being described in detail, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, each functional unit in each embodiment of the utility model can integrate in one processing unit,
It can be each unit to physically exist alone, can also be integrated in one unit with two or more units.It is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the utility model sheet
The all or part of the part that contributes to existing technology or the technical solution can be with software product in other words in matter
Form embodies, which is stored in a storage medium, including some instructions are used so that a meter
It calculates machine equipment (can be personal computer, server or network equipment etc.) and executes each embodiment the method for the utility model
All or part of the steps.And storage medium above-mentioned include: USB flash disk, read-only memory (ROM, Read-Only Memory), with
Machine access memory (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. are various to can store journey
The medium of sequence code.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (10)
1. a kind of focusing system of shield machine characterized by comprising current source, the emission electrode on the cutterhead of shield machine, shield
Bucking electrode on the shield of structure machine, the return electrode of the emission electrode and the bucking electrode, to the emission electrode with
The current detector that the electric current on conductor between the bucking electrode is detected, wherein in the current source supply in institute
In the case where stating emission electrode and the return electrode, the shield machine uses first mode emission current；In the current source
In the case where being powered at the bucking electrode and the return electrode, the shield machine uses second mode emission current；Wherein,
The focusing system further include:
Controller, for the emission current in such a way that the focusing system is superimposed using the first mode and the second mode
When, the superposition ratio of the first mode and second mode is controlled, so that the current value that the current detector detects is zero.
2. system according to claim 1, which is characterized in that the focusing system further include: on the bucking electrode
Current potential provide potential reference reference electrode, according to the reference electrode under the first mode and the second mode under
The tension measuring circuit that current potential on the emission electrode measures, under the first mode and the second mode under institute
State the total current measuring circuit and processor that the total current of shield machine measures, wherein the processor is used for basis
The current potential of the tension measuring circuit measurement, the electric current of the total current measuring circuit measurement and current detector detection
The electric current arrived determines the apparent resistivity of shield machine institute geodetic layer.
3. system according to claim 2, which is characterized in that the controller is also used to according to the voltage measurement electricity
The current potential of drive test amount, the electric current that the electric current and the current detector of the total current measuring circuit measurement detect, generates
The transmitting signal emitted for the emission electrode and the bucking electrode.
4. system according to claim 3, which is characterized in that the focusing system includes: transmit circuit, wherein described
The transmitting signal that transmit circuit is used to generate the controller carries out power amplification, and the signal of power amplification is provided
To the emission electrode and the bucking electrode.
5. system according to claim 2, which is characterized in that the processor includes: processing unit, wherein the place
Reason unit is used to determine the apparent resistivity of shield machine institute geodetic layer in the following manner:
Wherein, Ra is the apparent resistivity, and K is electrode coefficient, and V0 is the current potential of the emission electrode under the first mode, I
For the total current of the shield machine under the first mode, I1 assigns to institute for the total current of the shield machine under the first mode
The electric current of bucking electrode is stated, V0 ' is the current potential of the emission electrode under the second mode, and I0 ' is institute under the second mode
The total current for stating shield machine assigns to the electric current of the emission electrode.
6. system according to claim 2, which is characterized in that the controller includes: control unit, wherein the control
Unit processed, for controlling the superposition ratio by way of the ratio for controlling the first electric current and the second electric current, wherein described the
One electric current is that the total current of the shield machine under the first mode assigns to the electric current of the bucking electrode, and second electric current is
The total current of the shield machine assigns to the electric current of the emission electrode under the second mode.
7. system according to claim 2, which is characterized in that the tension measuring circuit includes: amplifier, filter and
Analog-digital converter, wherein
The amplifier, for being amplified to current potential collected on the bucking electrode；
The filter, the current potential for amplifying to the amplifier are filtered；
The analog-digital converter, for the analog signal of the current potential obtained after filtering to be converted to digital signal.
8. system according to any one of claim 1 to 7, which is characterized in that the current detector include with down toward
It is one of few: Rogowski coil, current transformer, fibre optic current sensor.
9. system according to claim 8, which is characterized in that the current transformer has magnetic core.
10. a kind of shield machine, which is characterized in that the focusing system including shield machine described in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201821305793.8U CN208934695U (en) | 2018-08-13 | 2018-08-13 | The focusing system and shield machine of shield machine |
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| CN201821305793.8U CN208934695U (en) | 2018-08-13 | 2018-08-13 | The focusing system and shield machine of shield machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026021A (en) * | 2018-08-13 | 2018-12-18 | 中国电子科技集团公司第二十二研究所 | The focusing system and method for shield machine |
-
2018
- 2018-08-13 CN CN201821305793.8U patent/CN208934695U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026021A (en) * | 2018-08-13 | 2018-12-18 | 中国电子科技集团公司第二十二研究所 | The focusing system and method for shield machine |
| CN109026021B (en) * | 2018-08-13 | 2024-02-27 | 中国电子科技集团公司第二十二研究所 | Focusing system and method of shield tunneling machine |
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