JPH0197758A - Automatic control system of method of lift-up construction - Google Patents

Abstract

PURPOSE: To enhance operational safety and prevent deflection etc., of the subject to be lifted up by controlling jacks so that the jacks rise while maintaining the horizontality of the subject. CONSTITUTION: The amounts of rise of jacks 3 are detected while the jacks 3 are rising, and when the jacks 3 differ in amount of rise by more than an allowable range, the jack 3 which is most advanced is temporarily stopped. Once each jack 3 has risen one stroke, a level difference on a subject is detected, and the next stroke of each jack 3 is determined on the basis of the difference.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic control system for a lift-up construction method.

(Prior art) Conventionally, when moving an object to be lifted, such as a structure such as a large roof, for example, members such as columns and beams that make up the structure are moved one by one using a crane, winch, etc. The work was done by moving the parts upward one by one and assembling each member at a predetermined location (high place). However, as described above, this method requires assembly work at a high place, which is dangerous.

Therefore, in recent years, structures have been lifted using a method called a lift-up method. That is, for example, as shown in Jikko@59-11557, there is a lower pedestal placed above a pillar or the like on which the object is installed, and a lower pedestal placed on the lower pedestal via a jack so as to be movable up and down. A plurality of lift-up devices each having a plurality of upper pedestals, hanging members vertically inserted through the lower mounts and the upper mount, and hanging member locking members arranged on the upper surface of the lower mount and in the vicinity of the upper surface of the upper mount. Use one. Then, connect the lower end of each hanging material to the object to be lifted, first jack up the upper pedestal and the hanging material together, and then connect the lower pedestal and the hanging material together with a locking member such as a fixing nut. to prevent the hanging material from descending and lower the jack. Thereafter, in response to the vertical movement of the jack, the locking members on the upper pedestal side and the locking members on the lower pedestal side are tightened or loosened, thereby gradually moving the hanging member upward.

In the case of such a lift-up method, the object to be lifted is supported at multiple points and lifted, so it is necessary to raise the object while maintaining a horizontal state at the points where each hanging material is connected due to safety requirements.

In other words, if one hanging material were to rise faster than the others, an unbalanced load would be applied to the lift-up device and the object, and unnecessary and unbalanced force would be applied to the lift-up device, making it difficult to lift up the jacks smoothly. There is a risk that the hanging material may not be able to be used or the hanging material may come off from the object. Further, there is a risk that the object itself may suffer from distortion durability problems.

Therefore, the amount and speed of rise of the jack are kept almost constant based on the intuition of skilled workers.

(Problem to be Solved by the Invention) However, in practice, it is difficult to keep the speed of each jack constant, and in particular, as the object to be lifted becomes larger, the number of lift-up devices required increases. Accordingly, the amount of data that must be controlled also increases, making it more difficult to control. In particular, if the object itself is not symmetrical and has an unbalanced load, the above problem becomes even more serious.

Furthermore, even if it is possible to make the rising speed of the jack uniform, it is difficult to maintain a constant tightening force when tightening the nut of the hanging material with each stroke. The level of things may be different. The higher the height of lifting, the greater the effect of the difference. Therefore, it is necessary to control the rising speed of the jack and to always tighten the nut at a constant rate, which is difficult in practice.

This invention was made in view of the above-mentioned problems.
The purpose is to provide an automatic control system for the lift-up method, which can raise the object while maintaining it almost horizontally, improve work safety, and prevent distortion of the object. .

(Means for Solving the Problems) In order to achieve the above-mentioned object, the automatic control system for the lift-up construction method according to the present invention includes: The amount of rise in the jack is detected, and when the difference between the rise amounts of each jack is greater than a predetermined value, the jack that has risen the most is stopped for a certain period of time, and when the jack finishes one rising movement, the The level difference between the points where the hanging materials are connected is measured and the stroke amount for the next jacking is corrected.

(Function) While the jack is rising, the amount of rise of the jack is detected, and if the rise amount of each jack differs by more than the allowable range, the jack that is most advanced is temporarily stopped. As a result, it is possible to juggle, that is, to move the object upward at approximately the same level.

Next, when each jack increases by one stroke, a level difference on the object is detected, and the next stroke amount of each jack is determined based on the difference. As a result, even if the object is tilted due to some reason, the tilt will be almost eliminated during the next jacking up.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, the schematic configuration of a lift-up device controlled using the present invention will be described. As shown in FIGS. 1 and 2, a lower pedestal 2 is placed on the upper end of a pedestal support 1.
A hydraulic jack 3 is installed at the center of the upper surface of the lower frame 2.
is placed upright, and an upper frame 4 is placed on the upper end of the jack 3. This allows the upper pedestal 4 to move up and down. Furthermore, the lower pedestal 2 and the upper pedestal 4 located around the jack 3 are
Through-holes 2a and 4a penetrating in the vertical direction are bored, and a hanging member 5 is disposed to pass through the through-holes 2al Ja. In this embodiment, threaded reinforcing bars are used as the hanging members 5. Also, on the outer periphery of this hanging member 5, there is a first locking member which is a locking member. A second anchoring nut 7.8 is screwed onto the hanging member 5 so as to be movable up and down. The first fixing nut 7 is disposed near the upper surface of the lower pedestal 2, and the second fixing nut 8 is disposed near the upper surface of the upper pedestal 4. Further, an object 9 to be lifted is attached to the lower end of the hanging member 5 described above.

Here, in the present invention, first, a stroke sensor 10 for detecting the amount of rise of the jack 3 is disposed in the lift-up device. In this embodiment, a potentiometer is used as the stroke sensor 10. That is, the rotary shaft of a potentiometer is connected to the actuating portion 3a of the jack 3, and the amount of movement of the actuating portion 3a is converted into a resistance value based on the rotation angle for detection and control.

Further, a level sensor 12 is disposed on the upper surface of the object 9, and is capable of detecting the difference in altitude between the points of the object 9 to which the hanging members 5 are connected. In this embodiment, a water level sensor is used. That is, a predetermined number of measuring parts 16 are arranged upright near the connecting part of the hanging material 5, and each measuring part 16 is connected with a pipe or the like to form a closed loop. Then, these measurement units 16 and by 1
A liquid such as water is sealed inside. As a result, each measuring section 16
The water surface inside is always kept horizontal to the ground. Therefore, by measuring the distance from the top surface of the object 9 to the water surface in each measuring section 16, the levelness can be detected. In other words, if the water surface in each measurement unit 16 from the top surface of the object 9 is the same, the object 9 is maintained in a horizontal state.On the other hand, if they are different, the shorter the distance to the water surface This means that it is relatively high.

Furthermore, 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 2, so that the amount of rise, speed, etc. of the jack 3 can be controlled based on information obtained from each sensor.

Furthermore, in this embodiment, the above-mentioned jack 3 is connected to a hydraulic pump unit 23 via a solenoid valve 22. Further, the solenoid valve 22 is opened and closed by the CPU 21.

Next, a system according to the present invention will be explained.

First, an example of the object 9 used in this embodiment will be described. As shown in FIG. 3, four top garters 26 of different weights are arranged in parallel, and adjacent top garters 26
It is composed of a middle beam 27 that connects the space, and has a substantially rectangular shape with 1,000 sides. Then, the system of the present invention is used when lifting and fixing such an object 9 to the upper end of the central space of the frame column 28 erected as a frame. That is, eight lift-up devices 30 are used to connect the hanging members 5 to both ends of each top garter 26.

Then, when the jack 3 is moved upward to raise the upper frame 4, the hanging material 5 is moved between the upper frame 4 and the second frame.
It rises while taking up the reaction force with the fixing nut 8. As a result, as the jack 3 rises, the object 9 also moves upward (Fig. 4).

(See (a) and (b)) At this time, since the first fixing nut 7 is also screwed around the hanging member 3, it moves upward together.

Next, when the jack 3 rises by a predetermined amount, the first fixing nut 7 is rotated and moved downward to come into contact with the upper surface of the lower frame 2 (see FIG. 4(c)).
lower. At this time, since the lower frame 2 and the first fixing nut 7 receive the reaction force of the hanging material, the hanging material 5, that is,
The object 9 does not descend (see FIG. 4(d)), and
After lowering the jack 3 completely, tighten the second fixing nut, 8.
is rotated and moved downward until it comes into contact with the upper surface of the upper frame 4 (see FIG. 4(e)), thereby completing one stroke of jacking up. Thereafter, by repeating the above-described operations, the object 9 is gradually raised.

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

That is, first, initial settings are input into the CPtJ21 (step 100), and then the stroke sensor 1
0, the amount of rise (position) of the jack 3 is detected (step 101), and it is determined whether the detected value has reached the stroke end. Here, the stroke end is the amount by which the jerk can rise in one stroke, and in the case of the first stroke, it corresponds to the standard one stroke amount input in the initial settings, and from the second time onwards, it corresponds to the correction work described later. This is the correction value calculated and input to each lift-up device.

Then, the lift amount of each lift-up device 30 that has not reached the stroke end is compared, and it is determined whether the difference between the maximum value and the minimum value is within the permissible stroke difference inputted in the initial setting. And if it exceeds that value,
Temporarily stop the rise of Jyatsuki 3, which is rising the most. Specifically, the solenoid valve 22 connected to the jack 3 is closed to prevent oil from flowing in (step 10).
3-106).

In addition, if there is a jack 3 that is already stopped, it is determined whether the jack that is stopped has become lower than the intermediate value between the maximum and minimum increase amount of the detected jack, If it is low, the solenoid valve 22 is opened again to start the upward movement of the jack 3 (steps 107 and 108).
The reason for delaying the start of the operation of the jack, which has been stopped once, rather than when it is within the allowable range compared with the lowest value, is to prevent the occurrence of so-called chattering.

In this way, each jack 3 rises while maintaining a substantially constant amount of rise, so that the object 9 rises while maintaining horizontality within an allowable range.

If all the jacks 3 are not at the set end stroke, the level sensor 12 detects each hanging material 5.
detects the level on the object 9 to which it is connected. Then, each detected value is input to the CPU 21, and the CPU 21
At the same time, the lowest point of the level is detected, and the level difference between the lowest point and each point is calculated. Then, based on the calculated results, the next stroke amount of the jack 3 of each lift-up device is corrected and determined. In other words, 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 other points is subtracted by the level difference from the standard stroke amount. value. By doing this, the inclination of the object 9 that occurred during the - stroke can be resolved during the next stroke (steps 109 to 109).
112), and a specific flowchart of steps 110 to 112 is shown in FIG.

Furthermore, in this embodiment, the altitude sensor 20 can measure and manage the altitude of the object 9 for each stroke. This makes it possible to check the actual altitude of the object 9, making it easier to manage work, etc., and slowing down the rising speed of the jack when it approaches the final destination, allowing it to be installed smoothly and without shock. It is now possible to reach.

Furthermore, in this embodiment, a display is linked to the CPU 21, so that the rising status of each jack, level difference, altitude, etc. can be easily checked.

Each of the above-mentioned controls is centrally controlled by the CPU, but you can use one CPU or prepare multiple CPUs and control each sensor (possibly for one session). You may also do so.

Moreover, it goes without saying that each sensor is not limited to the above-mentioned actual repair example, 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, work efficiency is improved, and the object can be made highly durable (of good quality) without distortion or the like.

Furthermore, even if an error sometimes occurs when tightening a locking member such as a fixing nut, the stroke of the jack can be corrected based on the level difference at each point on the object, so the error is almost always on the object. Does not affect levelness,
As a result, the tightening of the locking member does not require very high precision, making the work easier.

[Brief explanation of the drawing]

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 operations of the lift-up device. 5 and 6 are flowcharts showing an example of the control system according to the present invention. 2... Lower frame 3... Jacket 4...
Upper frame 5...Hanging member 7...First fixing nut 8...Second fixing nut 10...Stroke sensor 12...Level sensor Patent applicant Obayashi Co., Ltd. Attorney Patent attorney Professional - Color Ken axis Patent attorney Masatoshi Matsumoto I1 Figure 2

Claims (1)

[Scope of Claims] A lower frame, an upper frame disposed on the lower frame so as to be vertically movable via a jack, and a hanging member vertically inserted through the lower frame and the upper frame. In a lift-up method in which an object is moved upward using a plurality of lift-up devices having the upper surface of the lower mount and the hanging material locking member disposed near the upper surface of the upper mount, the lifting amount of the jack is When the difference in the lifting amount of each jack is equal to or greater than a predetermined value, the lifting of the jack that has risen the most is stopped for a certain period of time, and when one lifting operation of the jack is completed, the lifting of the jack on the object is stopped. This automatic control system for the lift-up method is characterized by measuring the level difference at the points where hanging materials are connected and correcting the next stroke of the jack.