JP2014005705A - Control system of generator used for ground improvement work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control system of generators capable of reducing generators' wasteful fuel consumption when performing a ground improvement work using a plurality of generators as a power source.SOLUTION: In a control system of generators, a control device 5 receives inputs of: necessary power data indicating relation between a depth when agitation blades 9 move downward as well as upward and necessary power during preliminary test construction in a construction objective ground B; data from a depth detection section 2 which obtains depth positions of the agitation blades 9; and data from an up-and-down detection section 3 which obtains whether the agitation blades 9 are in a state of moving upward or downward. Then, the control device 5 determines the number of generators G to be operated on the basis of the input data and controls operation of the determined number of generators G in such a manner as to minimize fuel consumed by all of the generators G in operation.

Description

  The present invention relates to a generator control system used for ground improvement construction, and more particularly, to ground improvement construction that can reduce wasteful fuel consumption by a generator when performing ground improvement construction using a plurality of generators as power sources. The present invention relates to a generator control system to be used.

  A ground improvement device equipped with a rotating agitating blade when performing ground improvement work such as the CDM method for improving soft soil to solid ground by stirring and mixing soft soil and improvement material. Is used. In order to supply electric power to the drive motor that rotationally drives the stirring blade, for example, a plurality of generators are operated in parallel (see, for example, Patent Document 1).

  Usually, the number of generators to be used is determined in consideration of the required power at the time of landing on the supporting ground where the rotational load of the stirring blades becomes the largest. In other words, in order to mix and agitate, for example, a soft ground surface layer portion or the like except when the supporting ground is bottomed, less power is supplied from the generator. Therefore, it is possible to reduce wasteful fuel consumption by the generator by changing the number of generators to be operated according to the required power.

  However, the invention described in Patent Document 1 focuses on properly maintaining the load sharing ratio of each generator and does not aim to reduce the fuel consumption of the generator. Moreover, even if a command for operation and stop is issued to the generator, a certain time lag occurs. Therefore, when the operation of switching the generator between operation and stop is performed manually, there is also a problem that it is difficult to switch between operation and stop of the generator in a timely manner.

JP 2007-60863 A

  A main object of the present invention is to provide a generator control system used for ground improvement work that can reduce wasteful fuel consumption by a generator when performing ground improvement work using a plurality of generators as a power source. .

  In order to achieve the above object, the generator control system used in the ground improvement construction of the present invention descends in the construction target ground while rotating the agitating blades of the ground improvement device by the power supplied from the plurality of generators. The control system of the generator used for the ground improvement construction in which the improvement material and the soil of the construction target ground are agitated and mixed during at least one of the descent or the rising, and the construction target ground is solidified. The control device to which required power data indicating the relationship between the required power and the depth when the stirring blade descends and ascends when the test construction is performed in advance on the construction target ground, and the depth of the stirring blade A depth detection unit for grasping the position, and data by the depth detection unit is input to the control device, and the operation is performed based on the data by the depth detection unit and the required power data. Determining the number of the generator, by driving the generator of the determined number, and controlling so as to minimize the fuel consumed by the plurality of generators.

  According to the present invention, by performing the test construction in advance on the construction target ground, the relationship between the depth and the required power when the stirring blade descends and rises is grasped, and the necessary power data indicating the relationship is stored in the control device. Since it is input, by inputting data from the depth detection unit that grasps the depth position of the stirring blade to the control device, power generation to be operated based on the data from the depth detection unit and the necessary power data If the number of machines is determined to be the minimum number that can supply the required power at that time, the fuel consumed by the plurality of generators can be minimized.

  Here, for example, data from a lift detection unit that grasps whether the stirring blade is in a descending or rising state is input to the control device, and data including the data from the lift detection unit is input to the control device. It is also possible to determine the number of generators to be operated based on the data. Thus, if the number of generators to be operated is different depending on whether the agitating blade is descending or rising, it will be consumed if it is determined to be the minimum number that can supply the necessary power at that time. This makes it possible to suppress the fuel that is used more effectively.

  In addition, for example, data by a speed detection unit that grasps the ascending / descending speed of the stirring blade is input to the control device, and each power generation is performed based on the data input to the control device including data by the speed detection unit. Use the specifications that determine the timing for issuing operation and stop commands to the machine. According to this specification, the timing for issuing the operation and stop instructions to each generator is determined in consideration of the ascending / descending speed data of the agitating blades, so there is a time lag for the operation and stop instructions in the generator. However, the generator can be switched between operation and stop at the desired depth.

  The operation histories of the plurality of generators are input to the control device in advance, and based on the operation histories, an earlier priority is set in the order of generators with less usage time, and the generators with earlier priorities are operated. It can also be controlled. According to this specification, it becomes possible to equalize the operating time of each generator, and the consumption of each generator can be made comparable.

It is explanatory drawing which illustrates the control system of the generator of this invention, and the ground improvement apparatus controlled by this control system. It is explanatory drawing which illustrates the outline | summary of the control system of FIG. It is explanatory drawing which illustrates the setting screen which sets the number of the generators operated according to the depth. It is explanatory drawing which illustrates a part of flowchart of switching control of the number of operation | movement of a generator.

  Hereinafter, the control system of the generator used for ground improvement construction of the present invention is explained based on an embodiment. The generator control system 1 of the present invention illustrated in FIGS. 1 and 2 controls a generator G (G1 to G5) that supplies power to a ground improvement device 7 used for ground improvement construction such as deep mixing processing. Used to do.

  The ground improvement device 7 rotates the drive motor 8 by the electric power supplied from the plurality of generators G to rotate the shaft 8a, and accordingly the rotation of the stirring blade 9 attached to the shaft 8a. While descending in the depth direction of the construction target ground B. At that time, the improving material (cement hardener) is discharged, the improving material and the soil of the construction target ground B are stirred and mixed, and the stirring blade 9 is lowered to the supporting ground B1, and then the stirring blade 9 The construction is completed by lifting it up and pulling it up on the ground. Through this series of steps, the construction target ground B is firmly improved. The stirring blade 9, the shaft 8 a and the drive motor 8 are moved up and down by winding and feeding the wire by the winch 10.

  In addition, when lowering and raising the depth of the construction target ground B while rotating the stirring blade 9, the improvement material is discharged, and the improvement material and the soil of the construction target ground B are stirred and mixed. Sometimes. Alternatively, when the stirring blade 9 is driven to rotate while being lowered in the depth direction of the construction target ground B, the improvement material is not discharged, and the improvement material is discharged only when it is raised. The soil of the ground B may be mixed with stirring. In other words, the present invention is applied to the case where the improvement material and the soil of the construction target ground are agitated and mixed while the stirring blade 9 is rotated and driven while the construction target ground B is descending or rising. .

  The control system 1 includes a control device 5 and a depth detection unit 2 that grasps the depth position of the stirring blade 9. As the control device 5, a personal computer or the like can be used. A generator control unit 5a and an operation control unit 5b are connected to the control device 5. The generator control unit 5a is connected to each generator G. The operation control unit 5b is connected to the depth detection unit 2, and data acquired by the depth detection unit 2 is input to the control device 5 via the operation control unit 5b.

  In this embodiment, the elevating detection unit 3 for grasping whether the stirring blade 9 is in the descending or rising state, and the speed detecting unit 4 for grasping the ascending / descending speed when the agitating blade 9 descends and ascends are provided. I have. Data acquired by the elevation detection unit 3 and the speed detection unit 4 is also input to the control device 5 via the operation control unit 5b. The depth detection unit 2, the elevation detection unit 3, and the speed detection unit 4 are provided on the winch 10. A display device 6 is connected to the control device 5.

  In the control device 5, necessary power data indicating the relationship between the depth and the required power when the stirring blade 9 descends and rises when the test construction is performed in advance on the construction target ground B in the same manner as the main construction is input. That is, before the main construction, the depth of the stirring blade 9 when the stirring blade 9 is lowered from the ground surface layer to the support ground B1 while rotating the stirring blade 9 in the construction target ground B and the rotational driving of the stirring blade 9 are necessary. Relationship between the required power and the depth position of the stirring blade 9 when the stirring blade 9 is raised from the support ground B1 to the ground surface while rotating the stirring blade 9 and the required power required for rotational driving of the stirring blade 9 The relationship is input to the control device 5.

  The control device 5 determines the number of generators G to be operated based on these input data, and instructs the generator control unit 5a to operate the determined number of generators G in this construction. Thus, control is performed to minimize the total amount of fuel consumed by the generator G.

  Normally, the maximum number of generators G to be used (installed number) is determined in anticipation of the required power at the time of landing on the support ground B1 where the rotational load of the stirring blade 9 is the largest. For example, the maximum number of generators G used here is five so that the maximum required power can be grasped by test construction and the maximum required power can be supplied without shortage.

  On the other hand, in the soft ground surface layer portion and the like, the rotational load of the stirring blade 9 is relatively small, so the required power is reduced. That is, since the hardness of the construction target ground B is different depending on the depth, the required power is different.

  Further, when the stirring blade 9 is lowered and when the stirring blade 9 is raised, even if the stirring blade 9 is at the same depth position, the hardness of the construction target ground B is different. Therefore, in the present invention, wasteful fuel consumption by the generator G is reduced by controlling the number of generators G that can supply the necessary power at that time without excess or deficiency.

  The display device 6 connected to the control device 5 displays a setting screen for setting the number of generators G to be operated according to the depth (depth position of the stirring blade 9), for example, as shown in FIG. . In the setting screen of FIG. 3, the number of generators G to be operated is set to be switched at the depth of the number switching points c1, c2, c3, c4, c6, c7, and c8.

  In the main construction based on the setting of FIG. 3, the required number (for example, two) of generator engines G are started based on the necessary power data acquired in the test construction input in advance to the control device 5. Thereby, electric power is supplied to the drive motor 8 of the ground improvement apparatus 7 from the several generator G operated in parallel.

  Next, while discharging the improved material, the stirring blade 9 is rotationally driven to gradually descend in the depth direction, and the generator G operated at a depth of 10 m (number switching point c1) is switched to three, and a depth of 15 m The generator G to be operated at (number switching point c2) is switched to five, the generator G to be operated at a depth of 20 m (number switching point c3) is switched to four, and the operation is performed at a depth of 30 m (number switching point c4). The number of generators G to be switched is switched to five, and then the five generators G are operated until the stirring blades 9 reach the support ground B1. After the stirring blade 9 is lowered to the supporting ground B1, the generator blade G is moved up while rotating the stirring blade 9 and operated at a depth of 30 m (number switching point c6), and the depth of 15 m is changed. The generator G to be operated at (number switching point c7) is switched to three units, the generator G to be operated at a depth of 10 m (number switching point c8) is switched to two units, and then the stirring blade 9 is lifted on the ground. Up to two generators G are operated.

  Specifically, the depth (required power) is increased by increasing the number of generators G to be operated in a place where the rotational load of the stirring blade 9 is large and decreasing the number of generators G to be operated in a place where the rotational load is low. Accordingly, the construction is performed by changing the number of generators G to be operated. If the number of generators G to be operated is set to the minimum number that can supply the required power at that time, the total amount of fuel consumed by all the generators G used can be minimized. Thus, useless fuel consumption by the generator G can be reduced.

  In the switching control of the number of generators G to be operated, for example, as in the flowchart shown in FIG. 4, first, it is determined whether or not each number switching portion is checked. Here, it is determined whether or not the number switching point c2 is checked. If the number is not checked, the process proceeds to a step of determining whether or not the next number switching point c3 is checked. On the other hand, if the number switching portion c2 is checked, it is determined whether the current depth H of the stirring blade 9 is shallower or deeper than the set H2 (depth 15 m). If it is shallower than H2, it waits for a predetermined time as it is, and waits for the stirring blade 9 to descend. After waiting for a predetermined time, it is determined again whether the current depth H of the stirring blade 9 is shallower or deeper than H2, and if it is shallow, it waits again for a predetermined time. On the other hand, if the current depth H of the stirring blade 9 is deeper than H2, the number switching a2 of the generator G to be operated is executed to switch the number to be operated from three to five.

  When switching control of the number of generators G to be operated is performed, data notifying whether the stirring blade 9 is currently descending or rising is sent from the ascending / descending detector 3 to the operation controller 5b. To the control device 5. Further, data notifying the current depth position (depth) of the stirring blade 9 is input from the depth detection unit 2 to the control device 5 through the operation control unit 5b.

  In addition, it is also possible to omit the elevating detection unit 3 and make a specification for determining the number of generators G to be operated based only on the required power data and the data from the depth detection unit 2. That is, it is possible to perform control for switching the number of generators to be operated based on the depth of the stirring blades 9 regardless of whether the stirring blades 9 are lowered or raised. This control can also reduce wasteful fuel consumption by the generator G. However, when the data by the elevation detection unit 3 is also used as in this embodiment, the stirring blade 9 is lowered and raised. However, more detailed control can be performed by varying the number of generators G to be operated. Thereby, the fuel consumed by the generator G can be more effectively suppressed.

  By the way, when the switching control of the number of generators G to be operated is performed, even if an operation and stop command is issued to each generator G, the generator G actually starts and stops operation. Until then, a certain time lag occurs. Therefore, it is preferable to determine the timing for issuing the operation and stop commands to each generator G in consideration of this time lag. That is, the operation and stop commands are issued earlier by the time lag than when the stirring blades 9 reach the respective depths (number switching points).

  For example, the speed detector 4 grasps the ascending / descending speed of the agitating blade 9 descending or ascending, and inputs the ascending / descending speed data to the control device 5, considering the ascending / descending speed data, Determine when to issue a stop command. If the ascending / descending speed of the stirring blade 9 is constant, the time at which the stirring blade 9 arrives at each set depth (number switching point) is known, so that the operation and the time lag before the arrival time are reached. Issue a stop command.

  As a result, even if the generator G has a time lag with respect to the operation and stop commands, it is possible to switch the operation and stop of the generator G at the desired depth (number switching point) at a target timing.

  In the case of using a plurality of generators G, the generator G with a long use time is more worn out than the generator G with a short use time. Therefore, it is preferable to equalize the usage time of all the generators G without being biased toward a specific generator G. Therefore, the operation history of each generator G (for example, the cumulative usage time at the construction site) is input to the control device 5 in advance. Based on this operation history, an earlier priority is set in the order of the generator G with less usage time. Then, in the switching control of the number of generators G to be operated, control is performed so that the generator G is operated from the generator G having a higher priority.

  For example, if the usage time is short in the order of the generators G1, G2, G3, G4, and G5, when construction is performed with the setting shown in FIG. 3, first, the two generators G1 and G2 are started. Next, the generator G3 is operated at a depth of 10 m (number switching location c1), the generators G4 and G5 are operated at a depth of 15 m (number switching location c2), and the generator is generated at a depth of 20 m (number switching location c3). G5 is stopped, and the generator G5 is operated at a depth of 30 m (number switching point c4). Similarly, the generator G5 is stopped at a depth of 30 m (number switching location c6), the generator G4 is stopped at a depth of 15 m (number switching location c7), and the generator G3 is stopped at a depth of 10 m (number switching location c8). After that, the two generators G1 and G2 are operated.

  Thereby, it becomes possible to equalize the operating time of each generator G, and the consumption condition of each generator G can be made comparable.

The following conventional examples and examples were carried out when a certain soft ground was ground improved up to a support ground having a depth of 44 m using a device similar to the ground improving device illustrated in FIG.
Conventional example: Three generators were operated throughout the construction to rotationally drive the stirring blades.
Example: When the present invention is applied to rotationally drive a stirring blade and the stirring blade is lowered and raised, two generators are operated in a section 20 m from the ground surface, and the supporting ground from a depth of 20 m. In this section, three generators were operated.
As a result, it was confirmed that the total amount of fuel consumed by the generator can be reduced by 5% or more compared to the conventional example.

DESCRIPTION OF SYMBOLS 1 Control system 2 Depth detection part 3 Elevation detection part 4 Speed detection part 5 Control apparatus 5a Generator control part 5b Operation control part 6 Display apparatus 7 Ground improvement apparatus 8 Drive motor 8a Shaft 9 Stirring blade 10 Winch G, G1-G5 Power generation Machine B Construction target ground B1 Support ground

Claims (4)

The agitating blade of the ground improvement device is rotated and driven by the electric power supplied from a plurality of generators while descending and rising in the construction target ground, and during this descent or ascent, the improvement material and It is a control system for a generator used for ground improvement construction in which the ground of the construction target ground is agitated and mixed, and this construction target ground is solidified,
A control device to which necessary power data indicating the relationship between the required power and the depth when the agitating blade descends and ascends when the test construction is performed in advance on the construction target ground, and the depth position of the agitating blade are grasped. A depth detection unit, the data by the depth detection unit is input to the control device, the number of generators to be operated is determined based on the data by the depth detection unit and the required power data, the determined number A generator control system used for ground improvement construction, wherein the generator is operated to control fuel consumed by the plurality of generators to a minimum.   Based on the data input to the control device, including data from the lift detection unit, data from the lift detection unit that grasps whether the stirring blade is in a descending or rising state. The generator control system used for ground improvement construction according to claim 1, wherein the number of generators to be operated is determined.   Data by a speed detection unit that grasps the ascending / descending speed of the stirring blade is input to the control device, and based on the data input to the control device including data by the speed detection unit, for each generator The generator control system used for ground improvement construction according to claim 1 or 2, wherein a timing for issuing an operation and stop command is determined.   The operation histories of the plurality of generators are input to the control device in advance, and based on the operation histories, an earlier priority is set in the order of generators with less usage time, and the generators with earlier priorities are operated. The control system of the generator used for the ground improvement construction in any one of Claims 1-3 to control.

Images