JP2000204760A - Lift-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a lift-up device which can surely take the alignment of operations. SOLUTION: Each lift-up device 7 is constituted by using a hydraulic pump 20 having a plurality of discharge ports 20a, the number of which corresponds to that of main cylinders 10, for supplying a hydraulic fluid to the cylinders 10. Between the lift-up devices 7 provided on a frame 2, the opening/closing of a solenoid valve 24 which intermittently discontinue the feeding of the hydraulic fluid to each cylinder 10 is controlled based on the detected results of a displacement gauge installed to each lift-up device 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift-up device for sequentially lifting, for example, a tower crane, a curing frame and the like as the construction progresses.

[0002]

2. Description of the Related Art Conventionally, tower cranes have been frequently used to construct buildings such as various condominiums and buildings. Generally, this tower crane is configured to obtain a reaction force from a mast erected on the ground and to sequentially lift up as the construction of the building progresses. In recent years, a system in which a frame composed of a large flat steel truss is installed above a building under construction, and the frame is sequentially lifted up with the progress of the building is being used. . At this time, the frame may have the mast erected on the ground like the tower crane,
In some cases, it may be erected directly on the building under construction.

In order to lift up a tower crane or a frame as described above, an upper frame and a lower frame movably provided along a mast and a plurality of frames provided between the upper frame and the lower frame are provided. , And a lift-up device provided with stopper mechanisms provided on each of the upper frame and the lower frame.

[0004] In such a lift-up device, 1) With the stopper mechanism of the lower frame holding only the lower frame on the mast, the lifting cylinder is extended to raise the upper frame. 2) After the upper frame is locked to the mast by the stopper mechanism of the upper frame, the stopper mechanism of the lower frame is released. 3) After the lifting cylinder is contracted to raise the lower frame, the lower frame is locked to the mast by the stopper mechanism of the lower frame. By sequentially performing the above operations 1) to 3), the tower crane and the frame supported on the upper frame are raised.

[0005]

However, the conventional lift-up device as described above has the following problems. First, as shown in FIG. 6, a plurality of lifting cylinders 1 provided in a lift-up device and a driving cylinder 2 of a stopper mechanism of each of an upper frame and a lower frame are driven by one hydraulic pump 3. Usually it is. For this reason, the pipe 4 connected to the hydraulic pump 3 is branched into a plurality of portions on the way (portions (a) and (b) in FIG. 6), and a plurality of lifting cylinders 1 and a driving cylinder of each stopper mechanism are provided. 2 and connected to it. However, in such a hydraulic circuit, the hydraulic oil is not always uniformly distributed to each branch pipe at the branch portion of the pipe 4, so that the hydraulic oil from the hydraulic pump 3 is evenly supplied to each cylinder. Do not mean. In particular, when hydraulic fluid is supplied to the plurality of lifting cylinders 1 during the lift-up operation, the hydraulic oil supplied from the hydraulic pump 3 first flows into the lifting cylinder 1 with a small load, and the lifting cylinder 1 extends first. .
Then, when the load with the other lifting / lowering cylinder 1 is equalized or reversed, the other lifting / lowering cylinder 1 starts to extend. The whole of the plurality of lifting cylinders 1 is extended while repeating such a decrease, and the lift-up operation is performed. Therefore, during the lift-up operation, a guide roller or the like is provided between the upper frame and the mast so that the upper frame and the crane and the like on the upper frame are inclined and do not interfere with other parts. It is necessary to detect the operation stroke and perform electrical control to synchronize the lift cylinders 1. However, such a method has a problem in that the configuration and control contents of the lift-up device are complicated, which leads to an increase in cost of the device.

In order to lift up a large-frame frame, a plurality of lift-up devices are provided. In this case, in addition to the problem of the lift-up device alone, There is such a problem. When the frame is lifted up by a plurality of lift-up devices, it is necessary to synchronize the operation between the lift-up devices in order to maintain the horizontal posture of the frame during the elevating operation. For this reason, conventionally, the operation stroke of each lift-up device is detected, and based on the stroke difference, the operation of the hydraulic pump in each lift-up device is controlled by an inverter, and the discharge flow rate of hydraulic oil from each hydraulic pump is controlled. Control is being done. In addition to this method, at the discharge port of the hydraulic pump of each lift-up device,
A proportional control valve for controlling the discharge flow rate is provided, and the discharge flow rate from each hydraulic pump is adjusted by controlling each proportional control valve, so that synchronization between the lift-up devices is achieved. However, in such a configuration in which synchronization is performed between the lift-up devices using the inverter and the proportional control valve, there is a problem that the number of components increases and the cost of the system increases.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and has as its object to provide a low-cost lift-up device capable of reliably synchronizing operations.

[0008]

The invention according to claim 1 is
A device that lifts up along a building under construction, and includes a plurality of drive cylinders that are hydraulically extended and retracted in a vertical direction between an upper frame and a lower frame that can be freely moved up and down in a vertical direction. The upper frame and the lower frame are each provided with a stopper mechanism detachably fixed to the building or mast, and the drive cylinder has a hydraulic pump and a hydraulic pump as a drive source thereof. Control means for controlling the operation of the hydraulic pump, wherein the hydraulic pump is formed with a plurality of discharge ports for individually discharging hydraulic oil toward each of the plurality of drive cylinders. I have.

By using a hydraulic pump having a plurality of discharge ports as described above, hydraulic oil is uniformly supplied to each cylinder, as compared with a conventional configuration in which a branch branches in the middle of a pipe.

[0010] The invention according to claim 2 is the lift-up device according to claim 1, wherein the plurality of lift-up devices are integrally provided on a frame that lifts up along a building under construction. Wherein each of the lift-up devices is provided with a displacement gauge for detecting expansion and contraction displacement of at least one of the plurality of drive cylinders, and a solenoid valve is provided between each of the drive cylinders and the pump. The control means operates the solenoid valves of the lift-up devices to drive the drive cylinders based on the detection result of the displacement meter, thereby controlling the plurality of lift-up devices. A lift-up device characterized in that the operation is synchronized.

As described above, by detecting each displacement between the lift-up devices and controlling the operation of the lift-up devices, the operation can be synchronized between the lift-up devices. At this time, the operation of each lift-up device is controlled by interrupting the supply of hydraulic oil from the hydraulic pump to each drive cylinder by simply turning on and off the solenoid valve.

According to a third aspect of the present invention, in the lift-up device according to the second aspect, the control means is configured to repeat the control for each stroke smaller than the operation stroke of the drive cylinder. It is characterized by having.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lift-up device according to the present invention will be described below with reference to FIGS. Here, an example is described in which the lift-up device according to the present invention is applied to a large-frame frame.

FIG. 1 shows a frame F which is installed above a building B under construction, and which is sequentially lifted up as the construction of the building B progresses. As shown in this figure, the frame F is, for example, a steel truss structure and has a large planar shape that covers the entire upper part of the building B under construction.
And a horizontal transfer device 5B.

The frame F has a plurality of masts 6.
Supported by These masts 6 are erected on the ground on the outer peripheral side of the building B, and are fixed to the building B by a stay 6a or the like at an intermediate portion thereof. Each mast 6 can be extended upward by adding a mast member 5a of a predetermined length. As such a mast 6, a conventional tower crane can be diverted.

Each mast 6 has a frame F
Is provided with a lift-up device 7 for lifting up. As shown in FIG.
Is schematically constituted by an upper frame 8 and a lower frame 9 and a hydraulic main cylinder (drive cylinder) 10 provided between the upper frame 8 and the lower frame 9.

The upper frame 8 and the lower frame 9 are
Each has a square ring shape located on the outer periphery of the mast 6,
The upper frame 8 is movable along the mast 6 in the vertical direction.
And are integrally fixed via the The upper frame 8 and the lower frame 9 are each provided with a stopper mechanism 12. Each stopper mechanism 12 is a hydraulic stopper cylinder (not shown) that is driven to expand and contract in the horizontal direction.
And a stopper member (not shown) which is driven toward and away from the mast 6 by this stopper cylinder (not shown) to be inserted into and removed from a locking hole or the like formed in the mast 6. The upper frame 8 or the lower frame 9 can be detachably fixed to the mast 6 by the stopper mechanism 12.

The main cylinder 10 is driven to expand and contract in the vertical direction. The upper end is connected to the upper frame 8 and the lower end is connected to the lower frame 9. A plurality of, for example, four such main cylinders 10 are arranged between the upper frame 8 and the lower frame 9.

In such a lift-up device 7, the stopper mechanism 12 of both the upper frame 8 and the lower frame 9 changes the initial state in which the lift-up device 7 is fixed to the mast 6 by the stopper mechanism 12 of the upper frame 8. Is released, and the lift-up device 7 is supported by the mast 6 only by the stopper mechanism 12 of the lower frame 9. All the main cylinders 10 are extended by a predetermined stroke, whereby the upper frame 8 is raised. The stopper mechanism 12 of the upper frame 8 is locked to the mast 6. The fixing of the lower frame 9 by the stopper mechanism 12 is released, and the lift-up device 7 is supported by the mast 6 only by the stopper mechanism 12 of the upper frame 8. All the main cylinders 10 are contracted by a predetermined stroke, whereby the lower frame 9 is pulled up. By locking the stopper mechanism 12 of the lower frame 9 to the mast 6, the lift-up device 7 is supported by the mast 6 by the stopper mechanisms 12 of both the upper frame 8 and the lower frame 9. By sequentially performing the above-mentioned operations (1) to (4), the lift-up device 7 itself is raised by obtaining a reaction force on the mast 6. Then, the lifting operation is performed simultaneously by all the lift-up devices 7, so that the entire frame F supported by the lift-up devices 7 is raised.

In the frame F provided with a plurality of such lift-up devices 7, the hydraulic drive mechanism for vertically extending and contracting these lift-up devices 7 has the following configuration.

First, as shown in FIG.
Each lift-up device 7 includes one hydraulic pump 20 and a pipe 21 that supplies hydraulic oil from the hydraulic pump 20 to a plurality of main cylinders 10 that constitute the lift-up device 7. Has become. Hydraulic pump 2
A so-called multi-flow type in which a predetermined number (a number corresponding to the pipes 21) of discharge ports 20a are formed in the pump itself is used for 0. And the pipe 21
It is arranged between each discharge port 20 a of the hydraulic pump 20 and each main cylinder 10. Thereby, the hydraulic oil discharged from the hydraulic pump 20 is individually supplied to each main cylinder 10 through each pipe 21. Moreover, since the discharge flow rate of the hydraulic oil from each discharge port 20a is designed to be uniform,
Each of the main cylinders 10 is configured to uniformly supply the working oil.

As shown in FIG. 4, the hydraulic drive mechanism A controls the plurality of lift-up devices 7 in a centralized manner. One unit is provided with a displacement meter 22 for detecting the lifting stroke, and the detection result of the displacement meter 22 is output to a control unit 23 provided in each lift-up device 7. Each of the pipes 21 shown in FIG. 3 is provided with an electromagnetic valve 24 whose operation is controlled by a control unit 23 (see FIG. 4), and the control unit 23 turns the electromagnetic valve 24 on and off. The supply of hydraulic oil from the hydraulic pump 20 to each main cylinder 10 through each pipe 21 can be intermittently performed.

Further, as shown in FIG. 4, the control unit 23 of each lift-up device 7 includes a central control unit (control means) 2.
5 (only one lift-up device 7 is shown in FIG. 4 and other lift-up devices 7 are omitted). The central control unit 25 receives, via the control unit 23, the detection results of the displacement meters 22 provided one by one in each of the lift-up devices 7, and based on the operation status of each of the lift-up devices 7, The operation of the lifting device 7 is controlled so that the lift-up operation is synchronized. The control method is described in more detail, and has the following configuration.

That is, as shown in FIG. 5, in the central control unit 25, the lift-up device 7
Is lifted up, a stroke smaller than the operation stroke of the main cylinder 10 (hereinafter referred to as
The control is performed for each “step size”. That is, for example, when the operation stroke of the main cylinder 10 is, for example, 1500 mm, the “step size” is set in advance to, for example, 40 mm, and this is set to the central control unit 25.
(STEP 1). This may be appropriately input to the central control unit 25 by various input means such as buttons.

Subsequently, the displacement meter 2 of each lift-up device 7
2 is reset to “0 (zero)” (STEP
2) The tuning control operation of the plurality of lift-up devices 7 provided on the frame F is started “ON” (STEP)
3). The above is the preparation work.

In actual operation, first, all the solenoid valves 24 of each lift-up device 7 are opened, hydraulic oil is supplied from the hydraulic pump 20, and all the main cylinders 10 are started to extend (STEP 4). At this time, in each of the lift-up devices 7, since the flow rate of the hydraulic oil supplied from each of the discharge ports 20 a of the hydraulic pump 20 to each of the main cylinders 10 is uniform, in the same lift-up device 7, The extension operation of the cylinder 10 is synchronized.

The displacement meter 2 of each lift-up device 7
In step 2, the amount of displacement of each of the lift-up devices 7 (one of the main cylinders 10) is detected, and it is determined whether the amount of displacement has reached the step size (40 mm in this case) (STEP 5). ). As a result, displacement meter 2
With respect to the main cylinder 10 that has been judged that the displacement amount detected in Step 2 has reached the increment (40 mm), all the solenoid valves 24 of the lift-up device 7 provided with the main cylinder 10 are closed, and the lift-up device 7 The lift-up operation is stopped (STEP 6). The operation is continued for the main cylinder 10 whose displacement amount has not reached the increment.

It is determined whether or not all the lift-up devices 7 provided on the frame F have stopped operating.
Steps 5 to 6 are repeated until all the lift-up devices 7 stop operating (STEP 7).

If all the lift-up devices 7 are in the above STEP
At the time of reaching 7, each lift-up device 7, that is, the frame F is lifted up by 40 mm.
At this time, the central control unit 25 stores that all the lift-up devices 7 have been extended by a predetermined increment (40 mm). Then, it is determined whether or not the actual stroke amount of the main cylinder 10 after the start of the ascent operation has reached the operation stroke of the main cylinder 10, and if not, the above STEPs 4 to 7 are repeated (STEP 8). . In other words, until the operation stroke of the main cylinder 10 is reached, the step size (40 m
The ascending operation is repeated every m).

Then, all the lift-up devices 7 are set to ST
When the condition of EP8 is satisfied, the lifting operation of one cycle is completed, and at this time, each lift-up device 7, that is, the frame F, has been raised by the working stroke of the main cylinder 10.

If it is necessary to raise the frame F by at least the operation stroke of the main cylinder 10, the above-described lifting operation cycle may be repeated.

In the lift-up device 7 described above, the hydraulic pump 20 having a plurality of discharge ports 20a is used in each lift-up device 7, so that each main cylinder 10 Hydraulic oil can be supplied uniformly. Therefore, each main cylinder 10 in the same lift-up device 7
Can be synchronized with each other, and the lift-up operation can be reliably performed without interfering with other members. In addition, since the hydraulic pump 20 having a plurality of discharge ports 20a is mechanically configured to uniformly supply hydraulic oil, each main cylinder 10 is required to synchronize with each lift-up device 7 alone.
There is no need to detect and control the displacement of the device, and the above effects can be realized at low cost without complicating the device configuration and control.

Further, between the plurality of lift-up devices 7 provided on the frame F, each lift-up device 7
Solenoid valve 2 for interrupting the supply of hydraulic oil to each main cylinder 10 based on the detection result of the displacement meter 22 provided for
4 is configured to be opened and closed. Thereby, the operation of each lift-up device 7 is controlled, and the operation can be synchronized between the plurality of lift-up devices 7. Therefore, it is possible to reliably lift up the frame F while maintaining the horizontal state of the frame F. In addition, since it is possible to achieve synchronization between the plurality of lift-up devices 7 by the electromagnetic valve 22 having only a simple on-off (opening / closing) operation, compared with the case where a conventional inverter or a proportional control valve is used, The cost of the component parts can be suppressed, and the above effects can be obtained at low cost.

In addition, the central control unit 25 is configured to control so as to repeat the lift-up operation for every increment smaller than the operation stroke of the main cylinder 10. Thereby, the operation of the lift-up device 7 is confirmed for each increment, the synchronization accuracy between the plurality of lift-up devices 7 can be improved, and the lift while maintaining the horizontal posture of the frame F is maintained. The up operation can be performed more reliably.

In the above embodiment, only the case where the lift-up device 7 is raised has been described as an example. However, it is needless to say that the structure of the present invention can be similarly applied to the case where the lift-down operation is performed. . In this case, the above operation may be performed in a reverse procedure. When performing the descending operation, in each of the main cylinders 10, the supply direction of the hydraulic pressure (the flow direction of the hydraulic oil) becomes the negative pressure direction, and the operation direction of the main cylinder 10 is the same as the load direction of the load from the frame F. become. In each of the lift-up devices 7 as well as between the plurality of lift-up devices 7, the frame F
If there is a bias in the load acting from the main cylinder 10 (biased load), the influence may significantly affect the operation of the main cylinder 10. However, with the above configuration, each of the lift-up devices 7
The synchronization between the plurality of main cylinders 10 and the synchronization between the plurality of lift-up devices 7 are ensured, so that the lowering operation can be performed more safely and reliably without being affected by the uneven load of the load. It is possible to do.

The structure of the frame F is as follows.
The structure, including the presence or absence of the crane 5A and the horizontal transfer device 5B, and the structure thereof are not limited to those described above. Further, for example, a configuration may be adopted in which the frame F is provided with an outer periphery curing or a roof covering the outer peripheral side or the upper side of the construction floor.

Further, in the above embodiment, the frame frame F is provided with the plurality of lift-up devices 7, but the frame lift F may be applied to a tower crane instead of the frame F. In this case, the lift-up device 7 is configured to be used alone. Therefore, components such as the displacement gauge 22 and the solenoid valve 24 for achieving synchronization between the plurality of lift-up devices 7 may be omitted.

In addition, the lift-up device 7 is moved up and down along the mast 6, but the structure and shape of the mast 6 do not matter at all. Further, the mast 6 may not be erected on the ground but may be erected on the building B under construction. In this case, the mast 6 itself can be rearranged upward by the lift-up operation of the lift-up device 7. Further, the upper frame 8 and the lower frame 9 are directly locked to the building B under construction by the stopper mechanism 12 instead of the mast 6, and the building B
It is also possible to adopt a configuration of raising and lowering along.

In addition, the detailed configuration of the lift-up device 7, for example, the stopper mechanism 12, etc., is not intended to be limited to only the configuration described above, and other configurations can be employed as appropriate.

The lift-up procedure by the lift-up device 7 may be other than the procedure described above.

Other than the above, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-described configurations may be appropriately selectively combined. No.

[0042]

As described above, according to the lift-up device of the first aspect, by using the hydraulic pump having a plurality of discharge ports, each drive cylinder can be provided in one lift-up device. Hydraulic oil is supplied uniformly to each other, and therefore, the operation of each drive cylinder in the same lift-up device can be synchronized, and the lift-up operation can be performed reliably without interfering with other members. be able to. In addition, since the hydraulic oil is uniformly supplied by the structural configuration of the hydraulic pump, there is no need to detect and control the displacement of each drive cylinder, and without complicating the device configuration and control. ,
The above effects can be realized at low cost. In addition, when the lift-up device is lowered, in each drive cylinder, the supply direction of the hydraulic pressure and the load direction of the load become the same. Therefore, it is possible to synchronize the load with the unbalanced load, and it is possible to more safely and reliably perform the descending operation.

According to the lift-up device according to the second aspect, when a plurality of lift-up devices are provided on the frame, based on the detection result of the displacement meter provided in each lift-up device, the hydraulic oil is supplied to each drive cylinder. It is configured to control a solenoid valve for interrupting the supply of air. This allows
The operation of each lift-up device is controlled, and the operation can be synchronized between the plurality of lift-up devices. As a result, not only synchronization of the drive cylinder in each lift-up device but also synchronization between a plurality of lift-up devices can be achieved. Therefore, it is possible to reliably lift up the frame while maintaining the horizontal state of the frame. In addition, the operation of multiple lift-up devices can be synchronized by using a solenoid valve that simply interrupts the supply of hydraulic oil to the drive cylinder. As a result, the cost of the components can be suppressed, and the above-described effect can be obtained at low cost.

According to the lift-up device of the third aspect, the control by the control means is repeatedly performed for each stroke smaller than the operation stroke of the drive cylinder. Thereby, the operation of the lift-up device is checked at every predetermined stroke, the synchronization accuracy between the plurality of lift-up devices can be improved, and the lift-up operation while maintaining the horizontal posture of the frame is performed. Can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a state in which a frame to which a lift-up device according to the present invention is applied is installed above a building under construction.

FIG. 2 is an elevation view showing the lift-up device.

FIG. 3 is a diagram showing a hydraulic drive circuit of a plurality of lift-up devices provided on the frame.

FIG. 4 is a diagram showing a relationship between each of the lift-up devices and a central control unit.

FIG. 5 is a flowchart showing a control method of the lift-up device.

FIG. 6 is a diagram showing a hydraulic drive circuit in a conventional lift-up device.

[Explanation of symbols]

 2 Frame 6 Mast 7 Lift-up device 8 Upper frame 9 Lower frame 10 Main cylinder (drive cylinder) 12 Stopper mechanism 20 Hydraulic pump 20a Discharge port 22 Displacement meter 24 Solenoid valve 25 Central control unit (control means) B Building

Continued on the front page (72) Inventor Haruyasu Minowa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Jun Nishimura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Toshiya Noji 2-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E177 KF01

Claims (3)

[Claims] 1. A device for lifting up along a building under construction, wherein the device is vertically driven hydraulically to extend and contract between an upper frame and a lower frame which can freely approach and separate vertically. A plurality of drive cylinders,
The upper frame and the lower frame are each provided with a stopper mechanism that can be detachably fixed to the building or the mast. Control means for controlling the
A lift-up device, wherein the hydraulic pump has a plurality of discharge ports for individually discharging hydraulic oil toward each of the plurality of drive cylinders. 2. The lift-up device according to claim 1, wherein the plurality of lift-up devices are integrally provided on a frame that lifts up along a building under construction. In the lift-up device, at least one of the plurality of drive cylinders is provided with a displacement gauge that detects expansion and contraction displacement thereof, and an electromagnetic valve is provided between each of the drive cylinders and the pump. In the control means, based on the detection result of the displacement meter,
A lift-up device, wherein the operation of the plurality of lift-up devices is synchronized by operating the electromagnetic valves of the respective lift-up devices to drive the respective drive cylinders. 3. The lift-up device according to claim 2, wherein the control means repeats the control for each stroke smaller than the operation stroke of the drive cylinder. Lift-up device.