CN106149670B - Compacting degree sensor and dynamic compaction machinery and compacting degree detection method - Google Patents
Compacting degree sensor and dynamic compaction machinery and compacting degree detection method Download PDFInfo
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- CN106149670B CN106149670B CN201510128604.9A CN201510128604A CN106149670B CN 106149670 B CN106149670 B CN 106149670B CN 201510128604 A CN201510128604 A CN 201510128604A CN 106149670 B CN106149670 B CN 106149670B
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Abstract
The invention discloses a kind of compacting degree sensor and dynamic compaction machinery and compacting degree detection methods, are related to engineering machinery field.Compacting degree sensor therein includes：Accelerometer and controller；Accelerometer acquires the acceleration of hammer ram in real time, and it is sent to controller, controller determines the rammer energy action time of hammer ram by comparing the acceleration of hammer ram with preset acceleration rate threshold, and using compacting degree and the inverse relation formula for ramming energy action time, the compacting degree of the soil body can be calculated action time according to the rammer of hammer ram.The present invention determines the rammer energy action time of hammer ram using the hammer ram acceleration acquired in real time, and then calculate the compacting degree of the soil body, the compacting degree that can automatic, in real time, accurately and comprehensively detect the soil body ensures the consistency of construction quality the phenomenon that owing to ram or cross rammer caused by reducing human factor.
Description
Technical field
The present invention relates to engineering machinery field, more particularly to a kind of compacting degree sensor and dynamic compaction machinery and compacting degree detect
Method.
Background technology
Dynamic compaction machinery is that a kind of general engineering mechanical device is widely used in current basement process.Dynamic compaction machinery, which has utilized, to be reseted
Standby to promote hammer ram to certain altitude, then discharging hammer ram makes its free-falling, the strong impact generated when being fallen using hammer ram
Power is compacted the soil body, to improve the intensity of ground, reduces the settlement of foundation being likely to occur.The effective object of dynamic compaction machinery is
Foundation soil body, it is therefore an objective to improve the intensity and uniformity coefficient of foundation soil body.Therefore, compacting degree is the key that dynamic compaction machinery construction quality
One of index.
Currently, mostly using conventional detection method to the detection of consolidation degree.Conventional detection method be after strong rammer machine operation, by
Testing staff extracts the detection that some points carry out compacting degree in work surface.The shortcomings that conventional detection method is：
1. subsequent detection, cannot monitor compacting degree in real time in the construction process；
2. it is small to detect dot density, it cannot reflect the compacting situation of entire work surface；
3. human error is larger, precision is low, as a result inaccurate.
Invention content
Technical problem to be solved of the embodiment of the present invention includes：The current existing detection of compacting degree detection method is too late
When, detection dot density is small or human error is big problem.
The first aspect of the present invention provides a kind of compacting degree sensor, including：Accelerometer and controller；Accelerometer is real
When acquire the acceleration of hammer ram, and be sent to controller, acceleration and preset acceleration of the controller by comparing hammer ram
Degree threshold value determines the rammer energy action time of hammer ram, and using compacting degree and the inverse relation formula for ramming energy action time, according to hammer ram
Ram and can calculate the compacting degree of the soil body action time.
In one embodiment of first aspect present invention, controller is during single is rammed, when the acceleration of hammer ram
When being equal to acceleration rate threshold for the first time, start timing, when the acceleration of hammer ram is again equal to acceleration rate threshold, stops timing, this
When timing time be hammer ram rammer energy action time.
In one embodiment of first aspect present invention, controller is during single is rammed, according to the acceleration of hammer ram
Degree calculates the rate of acceleration change of hammer ram；When the rate of acceleration change of hammer ram is more than zero and the acceleration of hammer ram is greater than or equal to
When acceleration rate threshold, start timing, when hammer ram rate of acceleration change be less than zero and hammer ram acceleration be less than or equal to plus
When threshold speed, stop timing, timing time at this time is the rammer energy action time of hammer ram.
In one embodiment of first aspect present invention, controller includes the first counting circuit, the first comparison circuit, the
Two comparison circuits, the first AND gate circuit, the second AND gate circuit, the first timing circuit, the second counting circuit；First counting circuit root
According to the rate of acceleration change of the acceleration calculation hammer ram of hammer ram, and export to the first comparison circuit；First comparison circuit is by hammer ram
Rate of acceleration change be compared with zero, when more than zero, signal is sent out to the first AND gate circuit, when less than zero, to
Two AND gate circuits send out signal；The acceleration of hammer ram is compared by the second comparison circuit with acceleration rate threshold, when being more than or wait
When acceleration rate threshold, signal is sent out to the first AND gate circuit, when less than or equal to acceleration rate threshold, to the second AND gate circuit
Send out signal；After first AND gate circuit receives the signal of the first comparison circuit and the second comparison circuit, to the first timing circuit
Trigger signal is sent out, the first timing circuit starts timing；Second AND gate circuit receives the first comparison circuit and the second comparison is electric
After the signal on road, trigger signal is sent out to the first timing circuit, the first timing circuit stops timing, and timing time at this time is
The rammer energy action time of hammer ram, and export to the second counting circuit, then reset；Second counting circuit can be made according to the rammer of hammer ram
The compacting degree of the soil body is calculated with the time.
In one embodiment of first aspect present invention, controller includes comparison circuit, metering circuit, the second timing electricity
Road, the second counting circuit；The acceleration of hammer ram is compared by comparison circuit with acceleration rate threshold, and in the acceleration etc. of hammer ram
When acceleration rate threshold trigger signal is sent out to metering circuit；Metering circuit counts the number for receiving trigger signal,
When count value is 1, first control signal is sent out to the second timing circuit, when count value is 2, is sent out to the second timing circuit
Then second control signal is reset；Second timing circuit starts timing after receiving first control signal, receives the second control
Stop timing after signal, timing time at this time is the rammer energy action time of hammer ram, and exports to the second counting circuit, then
It resets；Second counting circuit can calculate the compacting degree of the soil body action time according to the rammer of hammer ram.
In one embodiment of first aspect present invention, controller includes comparison circuit, third timing circuit, the second meter
Calculate circuit；The acceleration of hammer ram is compared by comparison circuit with acceleration rate threshold, and is equal to acceleration in the acceleration of hammer ram
When threshold value trigger signal is sent out to third timing circuit；After third timing circuit receives trigger signal, switch time status, if
It is currently at non-time status, then starts timing, if being currently at time status, stops timing, timing time at this time is
It for the rammer energy action time of hammer ram, and exports to the second counting circuit, then resets；Second counting circuit is according to the rammer energy of hammer ram
Action time calculates the compacting degree of the soil body.
In one embodiment of first aspect present invention, it is additionally provided on the circuit between accelerometer and controller
Signal conditioning circuit.
In one embodiment of first aspect present invention, compacting degree sensor further includes wireless sending module, with control
The output end of device connects, and wireless sending module converts the compacting degree of the soil body to wireless signal and sends.
The second aspect of the present invention provides a kind of dynamic compaction machinery, including hammer ram, any one aforementioned embodiment is equipped on hammer ram
In compacting degree sensor.
The third aspect of the present invention provides a kind of compacting degree detection method, including：The acceleration of acquisition hammer ram in real time；Pass through
The acceleration for comparing hammer ram determines the rammer energy action time of hammer ram with preset acceleration rate threshold；Utilize compacting degree and rammer energy
The inverse relation formula of action time can calculate the compacting degree of the soil body action time according to the rammer of hammer ram.
In one embodiment of third aspect present invention, by comparing acceleration and the preset acceleration of hammer ram
Threshold value determines that the rammer energy action time of hammer ram includes：During single is rammed, when the acceleration of hammer ram is equal to acceleration for the first time
When threshold value, start timing, when the acceleration of hammer ram is again equal to acceleration rate threshold, stops timing, timing time at this time is
For the rammer energy action time of hammer ram.
In one embodiment of third aspect present invention, by comparing acceleration and the preset acceleration of hammer ram
Threshold value determines that the rammer energy action time of hammer ram includes：During single is rammed, according to adding for the acceleration calculation hammer ram of hammer ram
Percentage speed variation；When the rate of acceleration change of hammer ram is more than zero and the acceleration of hammer ram is greater than or equal to acceleration rate threshold,
Start timing, when the rate of acceleration change of hammer ram is less than zero and the acceleration of hammer ram is less than or equal to acceleration rate threshold, stops
Only timing, timing time at this time are the rammer energy action time of hammer ram.
In one embodiment of third aspect present invention, compacting degree detection method further includes：It is default near zero
Take a value as acceleration rate threshold in range.
The embodiment of the present invention determines the rammer energy action time of hammer ram using the hammer ram acceleration acquired in real time, and then calculates
The compacting degree of the soil body can automatic, in real time, accurately and comprehensively detect the compacting degree of the soil body, owe to ram caused by reducing human factor
Or the phenomenon that crossing rammer, ensure the consistency of construction quality.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is that the present invention rams the hammer ram motion state schematic diagram on the different compactness soil bodys in experiment.
Fig. 2 is the motion state change schematic diagram of hammer ram during single of the present invention is rammed.
Fig. 3 is the structural schematic diagram of compacting degree sensor one embodiment of the invention.
Fig. 4 is the structural schematic diagram of controller one embodiment of the present invention.
Fig. 5 is the structural schematic diagram of controller further embodiment of the present invention.
Fig. 6 is the structural schematic diagram of another embodiment of controller of the present invention.
Fig. 7 is the flow diagram of compacting degree detection method one embodiment of the invention.
Fig. 8 is the flow diagram of compacting degree detection method further embodiment of the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes.
For ease of understanding, the term mentioned in the present invention is explained or is illustrated below.
Compacting degree refers to ground by Pounding Method treated soil compactness, is the important measurement of construction quality.
Ram can action time, refer to contact to earth from hammer ram to its speed be reduced to for the first time zero time interval.
Dynamic compaction machinery is that a kind of general engineering mechanical device is widely used in current basement process.Dynamic compaction machinery utilizes lifting
Equipment promotes hammer ram to certain altitude, and then discharging hammer ram makes its free-falling, the powerful punching generated when being fallen using hammer ram
It hits power to be compacted the soil body, to improve the intensity of ground, reduces the settlement of foundation being likely to occur.
Fig. 1 is that the present invention rams the hammer ram motion state schematic diagram on the different compactness soil bodys in experiment.In compactness
On the larger hard soil body, the accelerometer registration curve for being located at hammer ram is as shown by the solid line, and it is t1~t2 action times to ram
Period, on the smaller soft soil body of compactness, the registration curve for being located at the accelerometer of hammer ram is shown in dotted line, rams energy
Action time is t1~t3 periods.As it can be seen that compacting degree C and rammer can be in inverse relation between action time Δ T, i.e.,
Wherein K be ram experiment gained proportionality coefficient, and ram can action time Δ T can by measure hammer ram motion state variation come
It measures.
Fig. 2 is the motion state change schematic diagram of hammer ram during single of the present invention is rammed.As shown in Fig. 2, once ramming
During hitting, the motion state of hammer ram changes as follows：
1.t0~t1 moment：Hammer ram freely falling body, is in state of weightlessness, and accelerometer registration a (t) is 0.
It should be noted that accelerometer registration a (t) indicates acceleration of the accelerometer relative to hammer ram referential, ram
It is a (t)+g that it is practical, which to hammer the acceleration to fall into shape,.Unless otherwise indicated, the acceleration accelerometer registration of the hammer ram in the present invention
It indicates.
2.t1~t2 moment：At the t1 moment, ram contacts ground, hammer ram stress mutates, accelerometer registration
Also it mutates, hammer ram, which is made to become, at this time accelerates linear motion, until t2 moment ram speeds become 0.
As it can be seen that by the variation of accelerometer registration, in other words, by the acceleration change of hammer ram, rammer can be determined
It can action time Δ T.Due to the acceleration measurement near zero it is possible that shaking, to ensure accuracy, in zero
Take a value as acceleration rate threshold a in neighbouring preset rangexEnergy action time Δ T is rammed to calculate.
Fig. 3 is the structural schematic diagram of compacting degree sensor one embodiment of the invention.Compacting degree sensor is located on hammer ram.
As shown in figure 3, the compacting degree sensor of the embodiment includes：Accelerometer 10 and controller 20, accelerometer 10 acquire in real time
The acceleration of hammer ram, and it is sent to controller 20, acceleration and preset acceleration of the controller 20 by comparing hammer ram
Threshold value determines the rammer energy action time of hammer ram, and using compacting degree and the inverse relation formula for ramming energy action time, according to hammer ram
The compacting degree of the soil body can be calculated action time by ramming.
In one embodiment, controller 20 is during single is rammed, when the acceleration of hammer ram is equal to acceleration for the first time
When threshold value, start timing, when the acceleration of hammer ram is again equal to acceleration rate threshold, stops timing, timing time at this time is
For the rammer energy action time of hammer ram.With reference to figure 2, the t1 moment starts timing, and the t2 moment stops timing.
In one embodiment, controller 20 is during single is rammed, according to adding for the acceleration calculation hammer ram of hammer ram
Percentage speed variation；When the rate of acceleration change of hammer ram is more than zero and the acceleration of hammer ram is greater than or equal to acceleration rate threshold,
Start timing, when the rate of acceleration change of hammer ram is less than zero and the acceleration of hammer ram is less than or equal to acceleration rate threshold, stops
Only timing, timing time at this time are the rammer energy action time of hammer ram.With reference to figure 2, the t1 moment starts timing, and the t2 moment stops
Timing.
As shown in figure 3, compacting degree sensor can also include further signal conditioning circuit 30, wireless sending module 40,
Clock circuit 50, power module 60 etc..
Signal conditioning circuit 30 is arranged on the circuit between accelerometer 10 and controller 20, has filtering, shaping, puts
The functions such as big.Signal conditioning circuit 30 can be connected on simulation numeral (A/D) interface of controller 20, and processing comes from accelerometer
10 acceleration signal, and result is exported to controller 20.Specifically, signal conditioning circuit 30 may include filter, it is whole
Shape device, amplifier, be respectively intended to be filtered signal, shaping, amplification.
Wireless sending module 40 is connect with the output end of controller 20, for converting the compacting degree of the soil body to wireless communication
Number and sent.
Clock circuit 50 is a kind of auxiliary circuit being connected on the clock pins of controller 20, device 20 can be carried in order to control
For crystal oscillator frequency, pilot controller 20 completes the functions such as timing, counting and sampling；
Power module 60, is integrated in sensor, each module can be given to provide burning voltage.
Compacting degree working sensor process is：When dynamic compaction machinery works, accelerometer 10 starts to acquire the acceleration of hammer ram in real time
Angle value a is transferred to controller 20 after 30 filtering of signal conditioning circuit, shaping, amplification, and controller 20 is by the acceleration of acquisition
The acceleration rate threshold a of value a and settingxCompare, rams energy action time Δ T according to comparison result record, and according to formula
Compacting degree is calculated, is then transferred to wireless sending module 40, compacting degree is converted into wireless signal and is sent.
Software mode may be used in controller 20 or hardware circuit mode is realized.Below to the hardware circuit of controller 20 reality
Existing mode illustrates.
Fig. 4 is the structural schematic diagram of controller one embodiment of the present invention.As shown in figure 4, controller 20 includes the first meter
Calculate circuit 401, the first comparison circuit 402, the second comparison circuit 403, the first AND gate circuit 404, the second AND gate circuit 405, the
One timing circuit 406, the second counting circuit 407；First counting circuit 401 is according to the acceleration of the acceleration calculation hammer ram of hammer ram
Change rate, and export to the first comparison circuit 402；First comparison circuit 402 compares the rate of acceleration change of hammer ram with zero
Compared with when more than zero, signal is sent out to the first AND gate circuit 404, when less than zero, signal is sent out to the second AND gate circuit 405；
The acceleration of hammer ram is compared by the second comparison circuit 403 with acceleration rate threshold, when more than or equal to acceleration rate threshold, to
First AND gate circuit 404 sends out signal, and when less than or equal to acceleration rate threshold, signal is sent out to the second AND gate circuit 405；The
After one AND gate circuit 404 receives the signal of the first comparison circuit 402 and the second comparison circuit 403, to the first timing circuit 406
Trigger signal is sent out, the first timing circuit 406 starts timing；Second AND gate circuit 405 receives the first comparison circuit 402 and
After the signal of two comparison circuits 403, trigger signal is sent out to the first timing circuit 406, the first timing circuit 406 stops timing,
Timing time at this time is the rammer energy action time of hammer ram, and is exported to the second counting circuit 407, is then reset；Second meter
The compacting degree of the soil body can be calculated action time according to the rammer of hammer ram by calculating circuit 407.
Fig. 5 is the structural schematic diagram of controller further embodiment of the present invention.As shown in figure 5, controller 20 includes comparing
Circuit 501, metering circuit 502, the second timing circuit 503, the second counting circuit 407；Comparison circuit 501 is by the acceleration of hammer ram
It is compared with acceleration rate threshold, and trigger signal is sent out to metering circuit when the acceleration of hammer ram is equal to acceleration rate threshold；
Metering circuit 502 counts the number for receiving trigger signal, when count value is 1, is sent out to the second timing circuit 503
First control signal sends out second control signal to the second timing circuit 503, then resets when count value is 2；Second meter
When circuit 503 receive first control signal after start timing, stop timing after receiving second control signal, timing at this time
Time is the rammer energy action time of hammer ram, and is exported to the second counting circuit 407, is then reset；Second counting circuit 407
The compacting degree of the soil body can be calculated action time according to the rammer of hammer ram.
Fig. 6 is the structural schematic diagram of another embodiment of controller of the present invention.As shown in fig. 6, controller 20 includes comparing
Circuit 501, third timing circuit 601, the second counting circuit 407；Comparison circuit 501 is by the acceleration and acceleration rate threshold of hammer ram
It is compared, and trigger signal is sent out to third timing circuit 601 when the acceleration of hammer ram is equal to acceleration rate threshold；Third meter
When circuit 601 receive trigger signal after, switching time status start timing if being currently at non-time status, if currently
In time status, then stop timing, timing time at this time is the rammer energy action time of hammer ram, and exports and calculated to second
Circuit 407, then resets；Second counting circuit 407 can calculate the compacting degree of the soil body action time according to the rammer of hammer ram.
In order to reduce timing error, the first timing circuit 406, the second timing circuit 503,601 timing of third timing circuit
When timer may be used and counter works at the same time, the rammer energy action time of timer record is set as Δ T0, counter records
Number be n, then the rammer energy action time of counter records be n Δ t, can refer to formula Δ T=α Δs T0+ (1- α) n Δs t is to Δ
T0It is weighted averagely, to reduce timing error with n Δs t.α indicates that weight, value can be adjusted according to actual conditions, such as
0.5,0.6 equivalence can be chosen, but is not limited to examples cited.
The present invention also provides a kind of dynamic compaction machinery, including hammer ram, the compacting that is equipped on hammer ram in any one aforementioned embodiment
Spend sensor.
The present invention also provides a kind of compacting degree detection methods, and with reference to figure 7, this method includes：
S701 acquires the acceleration of hammer ram in real time；
S702, when determining that the rammer of hammer ram can act on by comparing acceleration and the preset acceleration rate threshold of hammer ram
Between；
S703 is calculated using compacting degree and the inverse relation formula for ramming energy action time according to the rammer energy action time of hammer ram
Go out the compacting degree of the soil body.
The first exemplary implementation method of step S702 is：During single is rammed, when hammer ram acceleration for the first time
When equal to acceleration rate threshold, start timing, when the acceleration of hammer ram is again equal to acceleration rate threshold, stops timing, at this time
Timing time is the rammer energy action time of hammer ram.
Second of exemplary implementation method of step S702 be：During single is rammed, according to the accelerometer of hammer ram
Calculate the rate of acceleration change of hammer ram；When hammer ram rate of acceleration change be more than zero and hammer ram acceleration be greater than or equal to accelerate
Spend threshold value when, start timing, when hammer ram rate of acceleration change be less than zero and hammer ram acceleration be less than or equal to acceleration
When threshold value, stop timing, timing time at this time is the rammer energy action time of hammer ram.
The further embodiment of compacting degree detection method is refering to what is shown in Fig. 8, execute following operation when hammer ram discharges：
S801, sampling obtain the acceleration signal value a (k) of hammer ram；
S802 calculates the rate of acceleration change of hammer ramWherein Δ t is the sampling period；
S803, as a ' (k)>0 and a (k) >=axWhen, controller starts timing；
S804, as a ' (k)<0 and a (k)≤axWhen, controller stops timing；
S805 is determined and is rammed energy action time Δ T, and it is to ram energy that controller, which starts timing to the period stopped between timing,
Action time Δ T；
In order to reduce timing error, the present invention also proposes a kind of clocking method.Specifically, same using timer and counter
When work, the rammer energy action time of timer record is set as Δ T0, the number of counter records is n, then the rammer of counter records
It can action time be n Δ t, can refer to formula Δ T=α Δs T0+ (1- α) n Δs t are to Δ T0It is weighted averagely, to subtract with n Δs t
Few timing error.α indicates that weight, value can be adjusted according to actual conditions, such as can choose 0.5,0.6 equivalence, but unlimited
In examples cited.
S806, controller utilizeCalculate the compacting degree C of the soil body；
S807 optionally converts compacting degree C to wireless signal and sends.
Due to the acceleration measurement near zero it is possible that shaking, to ensure accuracy, compacting degree detection side
Method further includes：Take a value as acceleration rate threshold in the preset range near zero.
The present invention determines the rammer energy action time of hammer ram using the hammer ram acceleration acquired in real time, and then calculates the soil body
Compacting degree can automatic, in real time, accurately and comprehensively detect the compacting degree of the soil body, owe to ram or cross caused by reducing human factor to ram
The phenomenon that, ensure the consistency of construction quality.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of compacting degree sensor, which is characterized in that compacting degree sensor includes：Accelerometer and controller；Accelerometer
The acceleration of acquisition hammer ram in real time, and it is sent to controller, controller adds by comparing the acceleration of hammer ram with preset
Threshold speed determines the rammer energy action time of hammer ram, and using compacting degree and the inverse relation formula for ramming energy action time, according to rammer
Hammer rams the compacting degree that can calculate the soil body action time；Ram to refer to contacting to earth for the first time to reduce to its speed from hammer ram action time
The time interval for being zero.
2. compacting degree sensor as described in claim 1, which is characterized in that controller works as hammer ram during single is rammed
Acceleration for the first time be equal to acceleration rate threshold when, start timing, when the acceleration of hammer ram is again equal to acceleration rate threshold, stop
Timing, timing time at this time are the rammer energy action time of hammer ram.
3. compacting degree sensor as described in claim 1, which is characterized in that controller is during single is rammed, according to rammer
The rate of acceleration change of the acceleration calculation hammer ram of hammer；When hammer ram rate of acceleration change be more than zero and hammer ram acceleration it is big
When acceleration rate threshold, start timing, when the rate of acceleration change of hammer ram is less than zero and the acceleration of hammer ram is less than
Or when equal to acceleration rate threshold, stop timing, timing time at this time is the rammer energy action time of hammer ram.
4. compacting degree sensor as described in claim 1, which is characterized in that controller includes the first counting circuit, the first ratio
Compared with circuit, the second comparison circuit, the first AND gate circuit, the second AND gate circuit, the first timing circuit, the second counting circuit；
First counting circuit is exported according to the rate of acceleration change of the acceleration calculation hammer ram of hammer ram to the first comparison circuit；
The rate of acceleration change of hammer ram is compared by the first comparison circuit with zero, and when more than zero, letter is sent out to the first AND gate circuit
Number, when less than zero, signal is sent out to the second AND gate circuit；Second comparison circuit by the acceleration of hammer ram and acceleration rate threshold into
Row compares, and when more than or equal to acceleration rate threshold, signal is sent out to the first AND gate circuit, when less than or equal to acceleration rate threshold
When, send out signal to the second AND gate circuit；First AND gate circuit receives the signal of the first comparison circuit and the second comparison circuit
Afterwards, trigger signal is sent out to the first timing circuit, the first timing circuit starts timing；Second AND gate circuit receives first and compares
After the signal of circuit and the second comparison circuit, trigger signal is sent out to the first timing circuit, the first timing circuit stops timing, this
When timing time be hammer ram rammer energy action time, and export to the second counting circuit, then reset；Second counting circuit
The compacting degree of the soil body can be calculated action time according to the rammer of hammer ram.
5. compacting degree sensor as described in claim 1, which is characterized in that controller includes comparison circuit, metering circuit, the
Two timing circuits, the second counting circuit；
The acceleration of hammer ram is compared by comparison circuit with acceleration rate threshold, and is equal to acceleration rate threshold in the acceleration of hammer ram
When to metering circuit send out trigger signal；Metering circuit counts the number for receiving trigger signal, when count value is 1
When, first control signal is sent out to the second timing circuit, when count value is 2, the second control letter is sent out to the second timing circuit
Number, then reset；Second timing circuit starts timing after receiving first control signal, stops after receiving second control signal
Timing, timing time at this time is the rammer energy action time of hammer ram, and exports to the second counting circuit, then resets；Second
Counting circuit can calculate the compacting degree of the soil body action time according to the rammer of hammer ram.
6. compacting degree sensor as described in claim 1, which is characterized in that controller includes comparison circuit, third timing electricity
Road, the second counting circuit；
The acceleration of hammer ram is compared by comparison circuit with acceleration rate threshold, and is equal to acceleration rate threshold in the acceleration of hammer ram
When to third timing circuit send out trigger signal；After third timing circuit receives trigger signal, switch time status, if currently
In non-time status, then start timing, if being currently at time status, stop timing, timing time at this time is to ram
The rammer energy action time of hammer, and export to the second counting circuit, then reset；Second counting circuit can be acted on according to the rammer of hammer ram
Time calculates the compacting degree of the soil body.
7. compacting degree sensor as described in claim 1, which is characterized in that on the circuit between accelerometer and controller
It is additionally provided with signal conditioning circuit.
8. compacting degree sensor as described in claim 1, which is characterized in that further include wireless sending module, with controller
Output end connects, and wireless sending module converts the compacting degree of the soil body to wireless signal and sends.
9. a kind of dynamic compaction machinery, including hammer ram, which is characterized in that be equipped with the compacting of claim 1-8 any one of them on hammer ram
Spend sensor.
10. a kind of compacting degree detection method, which is characterized in that including：
The acceleration of acquisition hammer ram in real time；
The rammer energy action time of hammer ram is determined with preset acceleration rate threshold by comparing the acceleration of hammer ram；
Using compacting degree and the inverse relation formula for ramming energy action time, the rammer of the soil body can be calculated action time according to the rammer of hammer ram
Solidity.
11. method as claimed in claim 10, which is characterized in that the acceleration by comparing hammer ram with it is preset
Acceleration rate threshold determines that the rammer energy action time of hammer ram includes：
During single is rammed, when the acceleration of hammer ram is equal to acceleration rate threshold for the first time, start timing, when the acceleration of hammer ram
Degree stops timing when being again equal to acceleration rate threshold, and timing time at this time is the rammer energy action time of hammer ram.
12. method as claimed in claim 10, which is characterized in that the acceleration by comparing hammer ram with it is preset
Acceleration rate threshold determines that the rammer energy action time of hammer ram includes：
During single is rammed, according to the rate of acceleration change of the acceleration calculation hammer ram of hammer ram；When the acceleration of hammer ram becomes
Rate starts timing, when the acceleration change of hammer ram more than zero and when the acceleration of hammer ram is greater than or equal to acceleration rate threshold
Rate stops timing less than zero and when the acceleration of hammer ram is less than or equal to acceleration rate threshold, and timing time at this time is to ram
The rammer energy action time of hammer.
13. method as claimed in claim 10, which is characterized in that further include：A value is taken in the preset range near zero
As acceleration rate threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510128604.9A CN106149670B (en) | 2015-03-23 | 2015-03-23 | Compacting degree sensor and dynamic compaction machinery and compacting degree detection method |
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| CN201510128604.9A CN106149670B (en) | 2015-03-23 | 2015-03-23 | Compacting degree sensor and dynamic compaction machinery and compacting degree detection method |
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| CN106149670B true CN106149670B (en) | 2018-09-04 |
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| CN107843743B (en) * | 2017-09-27 | 2020-01-10 | 上海申元岩土工程有限公司 | Dynamic compaction construction data acquisition method based on impact acceleration |
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