JPH0617635B2 - Lift-up method automatic control system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic control system for a lift-up method.

«Conventional technology» Conventionally, when an object to be lifted, such as a structure such as a large roof, is to be moved up, for example, the members such as columns and beams that make up the structure are separated by cranes, winches, etc. It is moving up. And the assembly work of each member was performed in a predetermined place (high place). As described above, this means requires the assembling work at a high place as described above, which is dangerous.

Therefore, in recent years, there has been a method of lifting a structure by means called a lift-up method. That is, for example, as shown in Japanese Utility Model Publication No. 59-11557, a lower pedestal disposed above a column or the like on which an object is installed and a lower pedestal movably disposed on the lower pedestal via a jack. Lift-up device having an upper pedestal, a lower pedestal and a suspending member vertically inserted into the lower pedestal and the upper pedestal, and a suspending member locking member disposed near the lower pedestal upper surface and the upper pedestal upper surface Use multiple. Then, the lower end of each suspending member is connected to the object to be lifted, first the upper mount and the suspending member are integrally jacked up, and then the lower mount and the suspending member are fixed with a locking member such as a fixing nut. To prevent the hanging member from descending, and to release the unification of the upper mount and the hanging member to lower the jack. Thereafter, the suspending member is gradually moved upward by tightening or loosening the locking member on the upper cradle side and the locking member on the lower cradle side corresponding to the vertical movement of the jack.

In the case of such a lift-up method, the object to be lifted is supported at a plurality of points and is lifted. Therefore, it is necessary to raise the position where the hanging members are connected while maintaining the horizontal state from the requirement of safety and the like. That is, if one lifting member is lifted faster than the other, an unbalanced load is applied to the lift-up device and the object, and an unnecessary and unbalanced force is applied to the lift-up device, resulting in a smooth jack. It may not be possible to lift up or the hanging material may come off the object. Also, the object itself may have a problem in terms of strain durability.

Therefore, the amount of rise and speed of the jack have been made substantially constant by the intuition of a skilled worker.

<< Problems to be Solved by the Invention >> However, it is practically difficult to keep the speed of each jack constant, and in particular, the larger the object to be lifted, the more the number of lift-up devices required for it, and Along with this, the amount of data that must be controlled also increases, making it more difficult to control. Especially, when the object itself is not symmetrical and has an unbalanced load, the above problem becomes more serious.

Furthermore, for example, even if the rising speed of the jack can be made uniform, it is difficult to make the tightening force constant when tightening the nut of the suspension material performed for each stroke. May be different. And, the higher the lifting height is, the larger the difference is. Therefore, it is practically difficult to control the ascending speed of the jack and to keep the tightening degree of the nut constant.

The present invention has been made in view of the above problems,
It is an object of the invention to provide an automatic control system of a lift-up construction method capable of raising an object while maintaining it substantially horizontal, improving work safety and not causing distortion of the object. .

<< Means for Solving Problems >> In order to achieve the above object, in the automatic control system of the lift-up construction method according to the present invention, in the lift-up construction method in which a plurality of lift-up devices are used to lift and move an object, The rise amount of the jack is detected by the rise amount detection sensor, input by the arithmetic unit, and calculated by the arithmetic unit, and when the difference in the rise amount of each of the jacks is equal to or more than a predetermined value, the highest rise is made to the jack. A control signal that stops for a certain period of time is output, and when one lifting operation of the jack is completed, the level sensor measures the level difference at the location on the object where the hanging material is connected to the arithmetic unit. The input signal is input and calculated by the calculation device to output the stroke amount correction control signal for the next jack.

≪Operation≫ While the jack is rising, the rise amount of the jack is detected by the rise amount detection sensor and input to the arithmetic unit, and this detected value is calculated by the arithmetic unit, and the rise amount of each jack is different from the allowable range. In this case, the arithmetic unit outputs a control signal for temporarily stopping the most advanced jack. As a result, the jack-up can be performed, that is, the object can be raised and moved at substantially the same level.

Next, when each jack rises by one stroke, the level sensor on the object is detected by the level sensor and input to the arithmetic unit, and the arithmetic unit is operated to determine the next stroke amount of each jack based on the difference. This is output from the arithmetic unit as a stroke amount correction control signal. As a result, even if the object is tilted for some reason, the tilt is almost eliminated during the next rise of the jack.

<< Examples >> Hereinafter, preferred examples of the present invention will be described with reference to the accompanying drawings.

First, a schematic structure of a lift-up device controlled by using the present invention will be described. As shown in FIGS. 1 and 2, a lower mount 2 is mounted on the upper end of a mount support 1.
At the center of the upper surface of the lower mount 2, a hydraulic jack 3 is provided.
Is standing upright. An upper mount 4 is placed on the upper end of the jack 3. Thereby, the upper mount 4 can be moved up and down. Furthermore, the lower mount 2 and the upper mount 4 located around the jack 3 are
Through-holes 2a and 4a are formed so as to penetrate in the up-down direction, and a suspending member 5 is arranged to penetrate through the through-holes 2a and 4a. In this embodiment, the suspending member 5 is made of threaded reinforcing bar. Further, first and second fixing nuts 7 and 8 as locking members are screwed around the outer periphery of the suspending member 5 so as to be vertically movable along the suspending member 5. The first fixing nut 7 is arranged near the upper surface of the lower pedestal 2, and the second fixing nut 8 is arranged near the upper surface of the upper pedestal 4. Further, the hanging member 5 described above
An object 9 to be lifted is attached to the lower end of the.

Here, in the present invention, first, the lift sensor is provided with the stroke sensor 10 for detecting the amount of rise of the jack 3. The stroke sensor 10 uses a potentiometer in this embodiment. That is, the rotary shaft of the potentiometer is connected to the operating portion 3a of the jack 3, and the amount of movement of the operating portion 3a is converted into a resistance value depending on the rotation angle and detected.

Further, a level sensor 12 is provided on the upper surface of the target object 9 so that it is possible to detect the height difference at each position of the target object 9 to which the suspending member 5 is connected. Then, in this embodiment, a water surface level sensor is used. That is, a predetermined number of measuring units 16 are arranged upright in the vicinity of the connecting portion of the hanging member 5 and each measuring unit 16 is connected by a pipe or the like to form a closed loop. Then, a liquid such as water is sealed in the measuring unit 16 and the pipe. As a result, each measuring unit 1
The water surface in 6 is always kept horizontal with respect to the ground. Therefore, the horizontality can be detected by measuring the distance from the upper surface of the object 9 to the water surface in each measuring unit 16. That is,
If the water surface in each measurement unit 16 is the same from the upper surface of the target object 9, it means that the target object 9 is maintained in a horizontal state,
On the other hand, if they are different, it means that the shorter the distance to the water surface, the higher it is.

Further, in this embodiment, a rotary encoder type altitude sensor 20 is attached to the object 9 so that the altitude of the object 9 can be measured.

Each of the above-mentioned sensors is linked to the CPU 21 and performs a calculation for controlling the amount of rise, speed, etc. of the jackie 3 based on the information obtained from each sensor.

Furthermore, in the present embodiment, the jack 3 described above is linked to the hydraulic pump unit 23 via the electromagnetic valve 22. Further, the solenoid valve 22 is adapted to be opened and closed by the CPU 21.

Next, the system according to the present invention will be described.

First, an example of the object 9 used in this embodiment will be described. As shown in FIG. 3, four top girders 26 having different weights are arranged in parallel and the adjacent top girders 26 are arranged.
The spaces are connected by a middle beam 27 to form a substantially rectangular plane. Then, the system of the present invention is used to lift and fix such an object 9 to the upper end of the central space of the frame pillar 28 that is erected in a frame. That is, the eight lifting devices 30 are used to connect the hanging members 5 to both ends of each top girder 26.

Then, when the jack 3 is moved up and the upper mount 4 is lifted, the hanging members 5 are moved to the upper mount 4 and the second mount 4 in association with this.
It rises while taking a reaction force with the fixing nut 8 of. As a result, as the jack 3 moves up, the object 9 also moves up (see FIGS. 4 (a) and 4 (b)). At this time, since the first fixing nut 7 is also screwed around the suspending member 3, the first fixing nut 7 also moves upward together.

Next, when the jack 3 is lifted by a predetermined amount, the first fixing nut 7 is rotated and moved downward to abut on the upper surface of the lower mount 2 (see FIG. 4 (c)). Jack 3 from this state
To lower. At this time, the lower pedestal 2 and the first fixing nut 7 receive the reaction force of the suspending member 5, so that the suspending member 5, that is, the object 9 does not descend (see FIG. 4 (d)). Then, after the jack 3 is completely lowered, the second fixing nut 8 is rotated and moved downward until it comes into contact with the upper surface of the upper mount 4 (see FIG. 4 (e)). This completes one stroke of jacking up. After that, by repeating the above-described work, the target object 9 gradually rises.

Further, in the present invention, the raising operation of the jack 3 is controlled according to the flowchart shown in FIG. 5 during the above-mentioned raising work.

That is, first, initial settings are input to the CPU 21 in advance (step 100). Next, the stroke sensor 10 detects the amount of rise (position) of the jack 3 (step 1
01). Then, the CPU 21 determines whether or not the detected value has reached the stroke end (step 10).
2). Here, the stroke end is an amount by which the jack can be lifted in one stroke, and in the case of the first stroke, the standard one stroke amount input in the initial setting corresponds, and in the second and subsequent strokes, the correction work described later is performed. It is one corrected stroke amount based on the stroke amount correction control signal calculated by the CPU 21 and input to each lift-up device.

Then, the CPU 21 compares the amount of lift of each lift-up device 30 that has not reached the stroke end by the CPU 21, and determines whether or not the difference between the maximum value and the minimum value is within the initially input allowable stroke difference. When it exceeds the value, the CPU 21 outputs a control signal for temporarily stopping the rising of the jack 3 which is rising the most. Specifically, the solenoid valve 22 connected to the jack 3 is connected to the CPU 2
It is closed by the control signal No. 1 so that oil does not flow in (steps 103 to 106).

If there is a jack 3 that is already stopped, it is determined whether it is smaller than the intermediate value between the maximum value and the minimum value of the detected amount of rise of the jack 3 and that it is smaller than that. In this case, the CPU 21 will restart the solenoid valve 2
2 is opened to start the upward movement of the jack 3 (steps 107 and 108). The reason why the operation start time of the jack 3 once stopped is compared with the minimum value and is not delayed when it is within the allowable range is to prevent so-called chattering.

In this way, the jacks 3 are lifted while maintaining a substantially constant lift amount, so that the object 9 is lifted while maintaining the horizontality within the allowable range.

Then, when all the jacks 3 reach the set end stroke, the level sensor 12 detects the level on the target object 9 to which the suspension members 5 are connected. Then, each detected value is input to the CPU 21, and the CPU 21 detects the lowest point of the level and calculates the level difference between the lowest point and each point. Then, the CPU 21 corrects and determines the next stroke amount of the jack 3 of each lift-up device based on the calculated result, and outputs it as a stroke amount correction control signal. That is, the stroke amount of the jack 3 of the lift-up device connected to the lowest point is the same as the standard stroke amount, and the stroke amount of the jack 3 of the lift-up device connected to another point is subtracted by the level difference from the standard stroke amount. Value. By doing so, the inclination of the object 9 generated in one stroke can be eliminated in the next stroke (step 109-).
112).

Further, in the present embodiment, the altitude sensor 20 can measure and manage the altitude of the object 9 for each stroke. As a result, the actual altitude of the object 9 can be checked, the work can be easily managed, and the rising speed of the jack 3 can be slowed down when approaching the final target position, so that the installation position is smooth and without shock. Can be reached.

Furthermore, in the present embodiment, the display is linked to the CPU 21 so that the rising status of each jack 3, the level difference and the altitude can be easily confirmed.

Although each control described above is centrally controlled by the CPU 21, one CPU 21 may be used, or a plurality of CPUs 21 may be prepared for each of the sensors 10 and 12 (some may be shared). ) May be controlled.

Needless to say, the sensors 10 and 12 are not limited to the above-described embodiments, and various sensors can be used as appropriate.

<< Effects of the Invention >> As described above, in the control system according to the present invention, the object to be lifted up can be raised while maintaining its levelness.

Therefore, the workability is improved, and the object can be made highly durable (quality is good) without distortion or the like.

Furthermore, even if an error occurs when the locking member such as the fixing nut is tightened, the jack stroke can be corrected by the level difference of each point on the object, so that the error is almost the levelness of the object. Does not affect
As a result, the work of tightening the locking member does not need to be very precise, and the work is easier.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a lift-up device used in the present invention, FIG. 2 is a schematic configuration diagram showing a preferred embodiment of the present invention, and FIGS. 3 and 4 are functions of the lift-up device. FIG. 5 is a flow chart showing an example of a control system according to the present invention. 2 ... Lower mount, 3 ... Jack 4 ... Upper mount, 5 ... Suspension material 7 ... First fixing nut (suspension material locking member) 8 ... Second fixation nut (suspension material locking member) ) 9 ... Object 10 ... Stroke sensor (rising amount detection sensor) 12 ... Level sensor 20 ... Altitude sensor 21 ... CPU (arithmetic unit) 30 ... Lift-up device

Claims (1)

[Claims] 1. A lower pedestal, an upper pedestal movably arranged on the lower pedestal via a jack, a lower pedestal, and a suspending member vertically inserted into the upper pedestal. In a lift-up construction method in which a plurality of lift-up devices having the upper surface of the lower pedestal and the upper surface of the upper pedestal and the suspending member locking member are used to lift and move an object, the jack is lifted. The amount of rise is detected by the rise amount detection sensor, input to the arithmetic unit, and calculated by the arithmetic unit, and when the difference in the amount of rise of each jack is equal to or more than a predetermined value, the increase is stopped for a certain period of time. A control signal is output, and when a single lifting operation of the jack is completed, a level sensor measures a level difference at a portion of the object to which the suspension member is connected, and inputs the level difference to the arithmetic unit. Computed by a computing device The automatic control system for the lift-up method is characterized in that the next stroke stroke correction control signal is output.