JPH0788679B2 - Soil stabilizer addition control method for excavated soil reclaimer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a soil stabilizer addition control method for an excavated soil reclaiming device, in which the amount of the soil stabilizer used in the excavated soil reclaiming device is reduced.

[Prior art] Excavated soil generated by excavation in gas pipeline construction, water supply and sewerage construction, electrical construction, etc. is subjected to scouring due to excavation, and as a result, it loses the necessary roadbed support capacity and is now used as a backfill material. It was no longer possible, so it was discarded. For this reason, high quality earth and sand has been newly used for backfilling.

Therefore, a method for reprocessing excavated soil in which excavated soil is improved and regenerated so that it can be used for backfilling or the like is disclosed in, for example, Japanese Patent Laid-Open No. 57-121086.

That is, the excavated soil, the recovery aid, and the soil stabilizer are blended and simultaneously crushed and premixed, then impacted to perform crushing and mixing, followed by sieving, and the bottom of the sieve is backfilled as reclaimed soil. It is reclaimed and used on the sieve as a recovery aid.

[Problems to be Solved by the Invention] However, the above-mentioned conventional excavated soil treatment apparatus has the following technical problems. That is, the regenerated soil obtained by regenerating the excavated soil has an appropriate moisture value,
It is required to have properties such as CBR value (roadbed bearing capacity ratio), and by adjusting the soil stabilizer composition according to the operating parameters of the equipment including the moisture value of excavated soil, It is operated with the required properties, but when the operation is repeatedly stopped and restarted due to the inclusion of foreign matter in the operation line, and the properties such as the water content of the excavated soil itself are irregular and high water content, Due to its high viscosity and difficulty in handling, the properties of the excavated soil were observed, and the moisture value was measured and the soil stabilizer was blended by collating with past operation data. Since the mixing ratio was not properly adjusted, the quality of the reclaimed soil fluctuated and was unstable.

In addition, if the soil stabilizer is improperly mixed, for example, if the soil stabilizer is added in an excessive amount, the CBR of the regenerated soil may be changed.
If the amount is too low, the CBR value of the reclaimed soil will be insufficient, and the excavated soil will be mixed and the crushing reserve will be prepared according to the above process. During the process of mixing, crushing and mixing, moving while sieving, the crushed and mixed material gradually grows into a lump, and the material is crushed intermediately to become a recovery aid. In addition to the crushing performance, the crushing and premixing performance in the crushing and premixing process of excavated soil with the recovery aid and soil stabilizer, the crushing performance in the crushing and mixing process due to the impact of the above materials, and The sieving efficiency in the sieving process is reduced, and the production capacity of reclaimed soil is reduced. In order to avoid the above-mentioned situation, attempts are made to automatically supply soil stabilizers, but the controlled object exhibits complicated characteristics as described above, and disturbance (irregular operation stop due to metal detector or foreign material selection etc.) ) Is added irregularly and the response is significantly delayed, so that the desired regenerated soil quality can be obtained even if the flow rate of excavated soil is detected and the soil stabilizer supply amount is controlled. It was difficult to perform stable control.

In this way, since it is impossible to realize the optimum addition of soil stabilizers, there is a large tendency to operate with excessive addition that does not lead to the above-mentioned capacity deterioration. This will result in a decrease in sex.

The present invention solves such a conventional problem. Even when the excavated soil has a high water content and a high-viscosity soil type, the addition amount of the soil stabilizer is reduced to be optimum, and the roadbed suitable for backfilling is achieved. A good quality reclaimed soil having bearing capacity and compaction performance can be obtained,
It is also an object of the present invention to provide an excellent soil stabilizer addition control method for an excavated soil reclaiming device, which can improve economy.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pre-crushing mixer for pre-crushing and mixing excavated soil, a soil stabilizer and a recovery aid, and the pre-crushed and mixed material. Soil quality supplied to the preliminary crushing mixer of the excavated soil reclaiming device, which comprises a crushing mixer for crushing and mixing, and a sieving machine for sieving the crushed and mixed material into reclaimed soil and a recovery aid. A method for controlling the amount of agent added, which controls the amount of soil stabilizer added to the pre-crushing mixer based on signals relating to the moisture value of excavated soil and the moisture value of reclaimed soil and the signal relating to the flow rate of reclaimed soil. In addition, the signal of the moisture value of the excavated soil and the moisture value of the reclaimed soil, and the correction signal transmitted to the moisture value of the excavated soil according to the moisture value ratio of the excavated soil and the reclaimed soil. , Addition of soil stabilizer based on the correction signal Based on the process of transmitting a function signal relating to the regenerated soil flow rate signal, and the soil stabilizer addition amount control signal transmitted by multiplying the function signal and the regenerated soil flow rate signal, and supplied to the preliminary crushing mixer. The amount of soil stabilizer added is controlled.

[Operation] The present invention having the above-described configuration has the following operations. That is, signals relating to the moisture value of excavated soil and the moisture value of reclaimed soil are obtained by online measurement, and converted into a digital signal together with the flow rate signal of reclaimed soil for arithmetic processing to calculate and control the soil stabilizer addition amount. As a result, it is possible to accurately grasp the above-mentioned information regarding the amount of water, which is the standard for the amount of soil stabilizer added, and under the stable control by optimal addition, the quality of the desired recycled product can be improved. It is possible to prevent the occurrence of excess quality, and it is possible to reduce the addition amount of the soil stabilizer, and to avoid the reduction in the economic efficiency of the excavated soil reclaiming treatment.

[Examples] The present invention will be described in detail below with reference to the drawings illustrating the examples.

FIG. 1 is a system diagram showing an example of steps of the method of the present invention.

Excavated soil 13, soil stabilizer 14, and recovery aid 18 are supplied to the pre-crushing mixer 1 together for pre-crushing and mixing.

The soil of the excavated soil is often composed of a high water content and high viscosity system, the soil stabilizer is, for example, cement or quicklime, and the recovery aid 18 is the sieve of the sieving machine 5 as described later. What is crushed by the intermediate crusher 7 using the above is used. The moisture value of the excavated soil 13 is measured by the moisture meter 11, and an infrared moisture meter or the like is used as the moisture meter 11.
The analog signal 22 of the above moisture value is transmitted online. When preliminarily crushed and mixed, the excavated soil 13, the soil stabilizer 14, and the recovery aid 18 are mixed so as to obtain soil stability according to the soil quality of the excavated soil. The soil stabilizer 14 is supplied by the metering feeder 8, and its addition amount is the main controller 24.
It is adjusted by an operation signal from the control panel 10 to the drive device 9 based on the addition amount control signal 25 of. Pre-crushing mixer 1
For example, a double roll crusher is suitable, and the supplied excavated soil 13, soil stabilizer 14 and recovery aid
The above materials are crushed and dispersed and mixed with each other in the process of being supplied between a pair of rolls which rotate with each other and being discharged from the roll gap.

The above-mentioned pre-crushed and mixed material 16 is crushed and mixed by the crushing mixer 2 with a mechanical impact action. As the crushing mixer 2 by impact, for example, Japanese Patent Publication No. 42-1186
No. 1 and JP-A No. 60-48151. It is preferable to use an impact mixer that is particularly suitable for crushing and mixing viscous substances, and the impact of the rotary impactor causes the surface of the flexural crushing plate and between the flexing crushing plate and rotary impact In this space, the material 16 is sufficiently crushed and mixed in a short time. Next, the crushed and mixed material 17 is separated by the sieving machine 5 into an under-sieve and an over-sieve. Below the screen is recycled soil 19
Is used as a backfill material after being measured by the weighing machine 4 and transmitting a flow rate signal 20 to be conveyed, and used as a recovery aid 18 on the sieve as described above.

The moisture value of the reclaimed soil 19 is measured by the moisture meter 12, and the above analog signal 23 of the moisture value is transmitted online.

Further, in many cases, various kinds of metal pieces are mixed in the excavated soil 13. In such a case, there is a risk of damaging the regenerator or the like during the reprocessing of the excavated soil 13, so a metal detector is installed between the transportation means of the excavated soil 13 and the pre-crushing mixer 1, for example. When the metal detector detects a metal piece in the excavated soil 13, the operation of the transportation means for the excavated soil 13 is stopped. Furthermore, there are cases where lumped non-metallic substances are mixed in the excavated soil 13, and like the above, there is a risk of damaging the regeneration device and the like and hindering smooth operation. The operation of the transportation means for excavated soil 13 is stopped. Thus, since the movement of the excavated soil 13 from the transportation means to the preliminary crushing mixer 1 is repeatedly repeated frequently, the fluctuation of the flow rate is remarkable, and the excavated soil is controlled in order to stably control the addition amount of the soil stabilizer. 13
The flow rate of the reclaimed soil 19 is detected without detecting the flow rate on the side. In addition, using the signals related to the water content of the excavated soil 13 and the water content of the reclaimed soil 19, the two are compared and the measurement error of the water content of the excavated soil 13 due to the particle size, shape, influence of foreign matter, measurement distance variation, etc. The above control is performed while making a correction.

After removing the metal pieces and non-metallic substances on the transportation means of the excavated soil 13, the operation of the regeneration device including the transportation means of the excavated soil 13 is restarted. As the moisture value of the excavated soil 13 in the above case, when restarted within a certain time (for example, about 5 to 15 minutes), the influence on the regenerated soil flow rate can be ignored, so If the analog signal 22 is used, and if it is restarted after a certain time (for example, about 5 to 15 minutes), the regenerated soil flow rate will be greatly affected. The constant speed set value signal 42a of the constant speed setter 26 of the machine is used to continue the control operation.

FIG. 2 is a block diagram showing an example of the control circuit of the method of the present invention, and the control operation will be specifically described with reference to FIG.

In FIG. 2, reference numeral 70 designates a signal processing device. Moisture meter 11
The analog signal 22 of the moisture value transmitted from the device passes through the moisture meter control unit 27 and is input from the current-voltage converter 28 to the signal processing device 70. Subsequently, after performing the A / D conversion process 33, the filter process 38 is performed to stabilize the amount signal of the moisture value which changes instantaneously at a predetermined time constant and convert the waveform to output. Next, in the calibration curve conversion process 43, a calibration curve showing the relationship between the voltage value of the moisture meter 11 and the moisture value of the excavated soil 13 is used to convert it into a signal representing the moisture value of the excavated soil 13.

Next, a dead time compensation process 48 is performed, and the time required for the excavated soil 13 to reach from the measurement point of the moisture meter 11 to the confluence with the soil stabilizer 14 and the soil stabilizer 14 are measured by the metering device 8.
Using the dead time based on the time required to reach the confluence point after the operation signal is output to 0.
Moisture value data every 5 seconds is accumulated and integrated to calculate average value 51
The average value of water content is calculated based on the above.

49 indicates the limiter processing, and in order to obtain the detection signal of the excavated soil 13, it is determined whether the moisture value is a certain value or more. If it is more than the certain value, the excavated soil 13 is measured at the measurement point. Sense that it exists. In addition, off-delay processing
In order to obtain the sensing signal 50a of the excavated soil 13 that is guided to 50, it is considered that the excavated soil 13 exists at the measuring point until a certain time elapses even if the moisture value is below a certain value. ing.

Analog signal emitted from moisture meter 12 for recycled soil 19
23 is input from the current-voltage converter 29 to the signal processing device 70 via the moisture meter control unit 27. Next, after performing A / D conversion processing 34, filter processing 39 is performed, and subsequently,
The process goes to the average value calculation process 45 to calculate the average value of the water content. 52 indicates the water content correction process, calculates the water content ratio of the excavated soil 13 and the reclaimed soil 19, according to the water content ratio of both,
A correction process is applied to the moisture value of the excavated soil 13 to output a signal 52a. Reference numeral 53 indicates a function generator, which calculates the addition rate of the soil stabilizer 14 corresponding to the input signal 52a and transmits the function signal 53a.

Analog flow rate signal 20 sent from weighing machine 4 of recycled soil 19
Is input to the signal processing device 70 from the current-voltage converter 30.
Next, after performing the A / D conversion process 35, the filter process 40 is performed to stabilize the digital signal of the flow rate that changes instantaneously at a predetermined time constant, and the average value calculation process 46 is introduced to average the flow rate. The value is calculated and the output signal is output as the flow rate signal 60 to the excavated soil reclaiming device.

Reference numeral 55 denotes a multiplier, which inputs the function signal 53a and the regenerated soil flow rate signal 60 to perform a multiplication process, the addition amount of the soil stabilizer 14 is calculated, and the addition amount signal 55a is output. Reference numeral 26 indicates a constant speed setting device of the metering device 8 of the soil stabilizer 14, and the setting signal is input from the current / voltage converter 32 to the signal processing device 70, and after performing A / D conversion processing 37, filter processing 42 The constant speed set value signal 42a is output.

67 is a transportation means at the measuring point of the moisture meter 11, for example, an operation signal of the quantitative feeder, 68 is a transportation means connected to the above, for example, an operation signal of the belt conveyor, and is inputted to the digital input processing 59 to output the operation signal 59a. To be done. 56 indicates the switching process, and the detection signal 50a of the excavated soil 13
Addition amount signal 55a, constant speed set value signal 42a and operation signal 59a
The operating mode is appropriately switched and selected according to the operating conditions of the excavated soil reclaiming device, and after the D / A conversion process 57 is performed, the addition amount control signal 25 is input from the current / current converter 63 to the control panel 10. The metering and feeding machine 8 is operated.

For example, when the soil stabilizer 14 is supplied at a constant speed at a predetermined speed in the operation mode, the constant speed set value signal 42 of the constant speed setter 26 is supplied.
Under a, select the switching process 56 and continue to
As described above, the metering and feeding machine 8 is operated.

On the other hand, the regenerated soil flow rate signal 60 is extracted and subjected to the D / A conversion processing 58, and then the signal 64a output from the current-voltage converter 64 is transmitted for recording the regenerated soil flow rate.

The signal 65 from the control panel 10 is sent to the signal 66a via the current-voltage converter 66, and is used for recording the soil stabilizer flow rate.

FIG. 3 shows the functional relationship between the addition rate of the soil stabilizer used in the function generator 53 in the control circuit of the method of the present invention and the moisture value of excavated soil. Here, the water content of the excavated soil is indicated by the water content ratio, and as described above, it is corrected according to the water content ratio between the excavated soil and the regenerated soil.

FIG. 4 is a calibration curve conversion process in the control circuit of the method of the present invention.
It shows the relationship between the sensitivity of the moisture meter used in 43 and the moisture value of excavated soil. Here, the sensitivity is based on the intensity ratio of characteristic absorption due to moisture of infrared rays.

Table 1 shows an example of a regeneration test of excavated soil by the method of the present invention, and the water content is shown by the water content ratio. That is, the regenerated soil has a low water content and a sufficient CBR is obtained by adding a small amount of soil stabilizer.

Table 2 shows an example of regeneration test of excavated soil according to the prior art for comparison with the method of the present invention.

The present invention is not limited to the above embodiment,
It goes without saying that various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As is apparent from the above-described embodiments, the present invention responds to changes in the moisture value of excavated soil and reclaimed soil and to changes in the reclaimed soil flow rate in the reprocessing of excavated soil. When controlling and supplying the added amount of soil stabilizer, the moisture value of excavated soil and reclaimed soil is detected, and the moisture value ratio of both is calculated and corrected to make an error in measuring the moisture value for excavated soil. It is possible to suppress the amount to a small amount and detect the regenerated soil flow rate with a particularly small amount fluctuation in the system of the excavated soil reclaiming device, and perform the arithmetic processing of the required addition amount corresponding to the averaged flow rate value. Since it is combined with the addition amount control of the metering machine based on the obtained addition amount control signal, the control characteristics of the soil stabilizer addition control are improved, stable control is performed, and the desired regenerated soil You can get quality and also soil quality It is possible to achieve an excellent effect that the amount of the stabilizer added is reduced and optimized to improve the economical efficiency of the excavated soil reclaiming device.

[Brief description of drawings]

FIG. 1 is a system diagram showing steps of the method of the present invention, FIG. 2 is a block diagram of the control circuit, FIG. 3 is an explanatory view of a function generator in the control circuit, and FIG. 4 is a calibration curve in the control circuit. It is explanatory drawing of a conversion process. 1 …… Preliminary crushing mixer 2 …… Crushing mixer 5 …… Sieving machine, 13 …… Drilling soil 14 …… Soil stabilizer, 18 …… Recovery aid 19 …… Reclaimed soil

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigenori Nagaoka 1780 Kamitakano, Yachiyo-shi, Chiba Kawasaki Heavy Industries, Ltd. Yachiyo factory (72) Inventor Takashi Okamoto 1780 Uetakano, Yachiyo-shi Kawasaki Heavy Industries, Ltd. Inside the Yachiyo Factory (72) Inventor Yoshiaki Kato 1780 Kamikono, Yachiyo City, Chiba Kawasaki Heavy Industries, Ltd. Inside the Yachiyo Factory (56) Reference JP-A-63-27613 (JP, A) JP-A-57-68416 ( JP, A) JP 63-32016 (JP, A)

Claims (2)

[Claims] 1. A pre-crushing mixer for pre-crushing and mixing excavated soil, a soil stabilizer and a recovery aid, a crushing mixer for crushing and mixing the pre-crushed and mixed materials, and the crushing and mixing A method for controlling the amount of soil stabilizer added to a preliminary crushing mixer of an excavated soil reclaiming device, which comprises a sieving machine for sieving the separated material into a reclaimed soil and a recovery aid, and a moisture value of the excavated soil. And soil stabilizer addition control of excavated soil reclaimer characterized by controlling the amount of soil stabilizer added to the pre-crushing mixer based on a signal relating to the moisture value of the reclaimed soil and a signal relating to the flow rate of the reclaimed soil. Method. 2. A signal of the moisture value of the excavated soil and a moisture value of the reclaimed soil, a correction signal transmitted to the moisture value of the excavated soil according to the moisture value ratio of the excavated soil and the reclaimed soil, and the correction signal. Based on the function signal related to the soil stabilizer addition rate,
Based on a flow rate signal of the reclaimed soil, and a soil stabilizer addition amount control signal transmitted by multiplying the function signal and the regenerated soil flow rate signal, it is possible to control the addition amount of the soil stabilizer supplied to the preliminary crushing mixer. The method for controlling addition of a soil stabilizer according to claim 1, which is characterized in that.