JPH0466798B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

This invention provides hydraulic jack control that adjusts the axial force of the hydraulic jack so that the amount of displacement of the structure falls within a predetermined set reference value range when the load of a structure is transferred to a pile or the like using a hydraulic jack. It is related to the device.

[Prior art and its problems]

Conventionally, when a large number of hydraulic jacks are used to transfer the load of a structure, the axial force of the hydraulic jacks is automatically adjusted so that the axial force of each hydraulic jack is within a predetermined set reference value range. This was done using fixed value control.
For this reason, even if the displacement amount of the structure is outside the set standard value range or the relative deviation of the displacement amount between measurement points exceeds the predetermined tolerance value, the axial force of the hydraulic jack remains at the predetermined setting. There was a problem in that the amount of displacement was not corrected if it was within the reference value range.

[Purpose of the invention]

This invention was made in view of the problems of the prior art, and it is difficult to control the axial force of each hydraulic jack at a fixed value when transferring the load of a structure using a hydraulic jack. It is an object of the present invention to provide a hydraulic jack control device that allows stable exchange even in the event of a sudden change.

[Key points of the invention]

This invention reduces the axial force of the hydraulic jack at the measurement point when the displacement of the measurement point exceeds a set standard value when the load of a structure is transferred to the hydraulic jack. Adjust the amount of displacement so that it is within the range of the set standard value, and if the amount of displacement at the target measurement point is less than the set standard value, increase the axial force of the hydraulic jack at that target measurement point. Adjust the amount of displacement so that it is within the range of the set standard value, and if the relative difference in the amount of displacement between the measurement point of interest and the surrounding measurement points exceeds the predetermined deviation tolerance range, adjust the value of one measurement point. This is characterized by adjusting the axial force of the hydraulic jack so that the relative difference in displacement falls within an allowable deviation range.

[Embodiments of the invention]

FIG. 1 is a block diagram showing an embodiment of a source pressure jack control device according to the present invention. In the figure, 1 is an electric pump unit, 2 is a hydraulic control panel, and 3 ₁ to 3
n is a load sensor, 4 ₁ to 4n are hydraulic jacks, 5 ₁
~5n is a displacement sensor, 6 ₁ ~6n is a data converter,
7 is a load measuring device, 8 is an interface device, 9 is a controller, and 10 is an operation panel. The electric pump unit 1 is a source of hydraulic pressure, and increases or relieves the axial force of the hydraulic jacks 4 ₁ to 4n by opening and closing valves in the hydraulic circuit in the hydraulic control panel 2.
The axial force of the hydraulic jack 4 ₁ to 4n is measured by the load sensor 3 ₁ to
3n, and read into the controller 9 via the load measuring device 7 and the interface device 8. The absolute displacement position of the structure supported by the hydraulic jacks 4 ₁ to 4n is determined by displacement sensors 5 ₁ to 5n.
data converters 6 ₁ to 6
n and is read into the controller 9 via the interface device 8. The displacement sensors 5 ₁ to 5n may be provided in one-to-one correspondence with the hydraulic jacks 4 ₁ to 4n, or may be provided only at predetermined hydraulic jack installation points. In the latter case, the amount of displacement of the structure at a location where a hydraulic jack is installed without a displacement sensor will be calculated using the values of displacement sensors installed at surrounding locations where hydraulic jacks are installed. . The controller 9 outputs opening/closing commands for the valves of the hydraulic circuit to the hydraulic control panel 2 via the operation panel 10. FIG. 2 shows an explanatory diagram of the arrangement of hydraulic jacks in replacement work, and is an example of the arrangement of hydraulic jacks in the case of constructing an underground railway underground of an existing structure. In the figure, a plurality of scaffolds 13 to be replaced are provided in order to construct an underground railway 12 underground of a structure 11, and a hydraulic jack is installed on each scaffold 13 to be replaced. FIG. 3 is a sectional view showing the replacement work, and shows the load of the structure being replaced by the hydraulic jack 14 in order to construct the underground railway 12 under the structure 11. ing. FIG. 4 is a layout diagram of each measurement point where hydraulic jacks are installed.
b~20b, 15c~20c are given. Figure 5 shows the amount of displacement of the structure at each measurement point where a hydraulic jack is installed, and the load (axial force) of each hydraulic jack measured by the load sensors ₃₁ to 3n shown in Figure 1. 4, and each symbol in the graph matches the symbol of the measurement point shown in FIG. The amount of displacement of the structure at each measurement point is calculated using the measurement value of the displacement sensor for the measurement point where a displacement sensor is installed as shown in Figure 1, and the measurement value of the surrounding measurement point for the measurement point without a displacement sensor. The value determined by a predetermined calculation based on the measured value of the displacement sensor provided at the point is used. FIG. 6 is a flowchart showing the operation of the controller 9, and the configuration of the hydraulic jack control device according to the present invention will be explained in detail below using FIGS. 4 to 6. In this invention, the order of measurement points for controlling the hydraulic jack is registered in advance; for example, in the example of FIG. 4, the order is 15a, 16a, ..., 20a,
The order is 15b, . . . 20b, 15c, . . . , 20c. Furthermore, the amount of displacement of the structure and the axial force (load) of the hydraulic jack are stored in advance as registered data for each measurement point. First, in step, the registration data of the measurement point of registration No. 1 (measurement point 15a in the example of FIG. 4) is sequentially output and set. The measurement point to which this registered data is set is called the measurement point of interest. Note that since the measurement point 15a is at a corner, the surrounding measurement points are 16a and 15.
b is specified. In step, the measured value of the displacement amount of the structure at the measurement point of interest 15a is compared with the upper limit value of the displacement amount. As shown in FIG. 5, the measured displacement value of the structure at the measurement point 15a of interest exceeds the upper limit value of displacement. The deviation 1 can be found. If measurement point 1 in Figure 5
If the displacement measurement value is smaller than the displacement upper limit value as shown in 6a to 20a, the process advances from step to step. In step, the displacement measurement value is compared with the displacement lower limit value. Measurement point 18 in Figure 5
If it is smaller than the lower limit value of displacement as shown in a, the process proceeds from step to step, and the lower limit value of displacement is subtracted from the measured displacement value to obtain deviation 1. Measurement points 16a, 17a, 19 in Figure 5
If the measured displacement value is within the upper and lower limits of displacement, as in a and 20a, proceed to step and calculate the deviation 1.
is determined as 0. After the deviation 1 is determined in steps , , the relative deviation 2 from the measured displacement values of the surrounding measurement points is determined in the next step. In the case of measurement point 15a, the surrounding measurement points are 16a and 15b, so measurement point 16
The deviation 2 from the measured displacement values of a and 15b is determined. The relative deviation 2 of the displacement measurement values of the measurement points 15a and 16a is shown as l in FIG. Next, in step, the maximum absolute value of the deviations 2 is compared with the allowable value. If the deviation 2 is smaller than the allowable deviation value, there is no need to consider the deviation 2, so the process proceeds to step 1, and the previously determined deviation 1 is determined as the deviation to be controlled. On the other hand, deviation 2
If is larger than the deviation tolerance value, it is necessary to consider deviation 2 as well, so proceed to step
The deviation A is obtained by subtracting the displacement reference value shown in FIG. 5 from the displacement measurement value. Further, in step, the deviation B is obtained by subtracting the above-mentioned displacement amount reference value from the displacement measurement value of the surrounding measurement point where the absolute value of the deviation 2 is the maximum. Next, in step, the magnitudes of the absolute values of deviations A and B are compared, and if the absolute value of deviation A is smaller, the process proceeds to step and deviation 1 is determined as the deviation to be controlled. In other words, when the absolute value of the deviation A is smaller, the measured displacement values of the surrounding measurement points where the deviation 2 is maximum are far from the displacement reference value and are considered abnormal values, so the deviation 1 It controls only the following. If the absolute value of deviation A is larger, the process advances from step to step, and the maximum absolute value of deviation 1 and deviation 2 is determined as the deviation to be controlled. In other words, if the deviation 1 is within the range of the displacement upper limit value and lower limit value, the deviation 1 is set to 0 in the step, but even in that case, the deviation 2 from the calculated displacement value of each surrounding measurement point is
is larger than the allowable deviation value and deviation A is larger, the axial force of this hydraulic jack must be controlled, so the maximum absolute value of deviation 2 is added to deviation 1 to force a larger value. It is creating a deviation. Once the deviation to be controlled has been determined in step , a comparison is then made in step 2 to see if this deviation is larger or smaller than the positive and negative tolerance values. If the deviation is smaller than the negative tolerance value, it is necessary to increase the axial force of the hydraulic jack, so if it is confirmed in step that the axial force of the hydraulic jack does not exceed the upper limit of axial force, Increase the hydraulic pressure at .
If it is determined in step that the axial force of the hydraulic jack exceeds the upper limit of axial force, the process proceeds to step without increasing the pressure of the hydraulic jack. Also, if the deviation is larger than the positive tolerance value, it is necessary to reduce the axial force of the hydraulic jack, so if it is confirmed in step that the axial force of the hydraulic jack is not below the lower limit of axial force, step Relieve the pressure from the hydraulic jack. If it is determined in step that the axial force of the hydraulic jack is less than the lower limit of axial force, the process proceeds to step without releasing the pressure of the hydraulic jack. Pressure increase and pressure release in step 2 are performed for a predetermined unit time. Therefore, the deviation does not necessarily fall within the allowable value at the end of the step. When the control of the hydraulic jack of the measurement point of registration No. 1 is completed in this way, data of the measurement point of registration No. 2 is set in the next step. In FIG. 4, the measurement point of registration No. 2 is 16a. Once the data is set in the step, the process advances to the next step where it is determined whether processing of all measurement points has been completed. In this case, since only the measurement point of registration No. 1 has been processed, the process returns to step and processing of the measurement point of registration No. 2 whose data was set in step is started. After that, follow the steps for all measurement points.
When the processing of all the measurement points is completed, the process advances to step 1, and a determination is made as to whether or not the control should be intermittent. If the control is to be connected, the process returns to the step and the same process is performed again for all measurement points. Even if the deviation does not fall within the allowable value in one process of step 2, it is possible to control the deviation so that it falls within the allowable value by repeatedly performing such processes.

【Effect of the invention】

According to this invention, when replacing the load of the structure or the hydraulic jack, the attractiveness of the hydraulic jack is controlled based on the amount of displacement of the structure and the relative deviation of the amount of displacement between measurement points. This makes it possible to prevent deformation of the structure due to replacement work. Furthermore, by arbitrarily changing each setting value, it is also possible to adjust the amount of displacement of the structure.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the hydraulic jack control device according to the present invention, Fig. 2 is an explanatory diagram of the arrangement of the hydraulic jack in replacement work, and Fig. 3 is a sectional view showing the pattern of the replacement work. , Figure 4 is a layout diagram of each measurement point where a hydraulic jack is placed, Figure 5 is a graph showing the displacement of the structure and the axial force of the hydraulic jack at each measurement point, and Figure 6 is a graph showing the axial force of the hydraulic jack. It shows an operation flowchart. DESCRIPTION OF SYMBOLS 1...Electric pump unit, 2...Liquid pressure control panel, _31-3n ...Load sensor, _41-4n ...Hydraulic pressure jack, _51-5n ...Displacement sensor, _61-6
n...Data converter, 7...Load measuring device, 8...
Interface device, 9... Controller, 10
...Operation panel, 11...Structure, 12...Underground railroad, 13...Scaffolding to be replaced, 14...Hydraulic jack.

Claims (1)

[Claims] 1. In a device for controlling multiple hydraulic jacks that exchange the load of a structure, a displacement detection means for detecting the amount of displacement of the structure at each measurement point where the hydraulic jacks are installed, and a displacement detection means for each hydraulic jack The displacement amount and axial force detected by the displacement amount detection means and the load detection means are input, and the displacement amount and axial force are used to detect each measurement point at each measurement point. and a controller that controls hydraulic jacks in a pre-registered order, and the controller determines whether the amount of displacement of the structure at the measurement point of interest is within a range of preset upper and lower limit values. If it does not exist, the first calculation means calculates the absolute deviation from the upper and lower limit setting values, and the relative deviation between the amount of displacement of the structure at the measurement point and the amount of displacement at the surrounding hydraulic jack installation point is calculated as the deviation. Based on the calculation results of the second calculation means and the first and second calculation means, which determine whether or not it is within the tolerance range, the absolute deviation becomes zero and the relative deviation falls within the deviation tolerance range. A hydraulic jack control device comprising a control means for outputting a control signal for the axial force of the hydraulic jack within a range in which the axial force does not exceed upper and lower limit set values.