JPH0138942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is particularly suitable for lifting and lowering sliding forms, work scaffolds, work floors, and highly rigid horizontal materials that support them using slip form construction methods and climbing form construction methods. The present invention relates to a technique for lowering this using a plurality of elevating and lowering jack devices.

For example, a structure under construction as shown in Figure 1
When raising and lowering the horizontal member (work floor) b that surrounds the structure a, a plurality of rods 1 (four in the figure) are erected around the structure a to guide the horizontal member b, and each rod 1 is equipped with an external lifting and lowering rod. The horizontal member b is mounted on the jacking device 2, and each lifting jack device 2 is operated simultaneously to raise and lower the horizontal member b.

FIG. 2 schematically shows this lifting jack device 2. As shown in FIG. That is, in the same figure, numerals 3 and 4 are upper and lower frames which are loosely fitted onto the rod 1, and each of which has tapered surfaces 3a and 4a formed opposite to the rod 1. The rod 1 is pushed in by the wedge effect of the engaging pawls 7 and 8 that are pushed between the surfaces 3a and 4a and the circumferential surface of the rod 1 by the elasticity of the springs 5 and 6.
is grasping. Both frames 3 and 4 are connected by a lifting jack 9 that extends and contracts in the vertical direction. Reference numerals 10 and 11 indicate an upper claw release jack and a lower claw release jack assembled on both frames 3 and 4 (the assembly structure is not shown), each of which directs the engaging claws 7 and 8 downward. It is provided with an upper claw release ring 12 and a lower claw release ring 13 for pushing back. 14 is a detector mounting rod erected on the lower frame 4, which is loosely fitted into the hole 3b drilled in the upper frame 3, and is installed in order from top to bottom to install the upper frame rise detector. 15. Jacket extension detector 1
6. A jack shortening detector 17 and a lower frame rise detector 18 are installed at a slight interval. These four types of detectors 15, 16, 1
7 and 18 are constituted by reed switches, for example. In addition, the upper claw and lower claw release ring 1
An upper claw release detector 19 and a lower claw release detector 20 are attached to the side ends of 2 and 13. Both detectors 19, 20 are constituted by proximity switches, for example.

The elevating and lowering jack device 2 having the above-mentioned structure is lowered by the following procedure. This is shown in Figure 3 A to G.
I will explain accordingly.

(A) First, FIG. 3A shows the initial state of the lowering operation of the device 2. The upper claw 7 and the lower claw 8 are each engaged with the rod 1, and the lifting jack 9 is in a shortened state.

(B) From the state of (A), use the engagement part between the upper claw 7 and the rod 1 as a reaction force support part, further shorten the lifting jack 9 slightly and lift the lower frame 4.
The engagement between the lower claw 8 and the rod 1 is released. The lifting height of the lower frame 4 at this time is regulated by operating the lower frame lift detector 18, and the shortening operation of the lifting jack 9 is stopped. Continue to release the upper claw 11
is activated to push down the lower claw release ring 13 and release the lower claw 8. Whether or not the lower claw 8 is completely released is detected by the lower claw release detector 20 (FIG. 3B).

(C) Next, from the state of (B), extend the lifting jack 9 downward to lower the lower frame 4. The jack extension detector 16 detects that the lower frame 4 has descended by a predetermined distance (FIG. 3C).

(D) Next, from the state of (C), lower claw release jack 11
The operation of the jack 11 is stopped, that is, the pressure oil is removed from the jack 11, and the lower claw 8 is returned to its old position by the restoring force of the spring 6 and engaged with the rod 1. The engagement of the lower claw 8 with the rod 1 is detected by the upper claw release detector 20 (FIG. 3D).

(E) Next, in the same way as when the lower frame 4 was slightly lifted in (B) above, the lifting jack 9 is slightly extended using the engagement part between the lower claw 8 and the rod 1 as a reaction force support part. Lift the upper frame 3 and release the engagement between the upper claw 7 and the rod 1.
The lifting height of the upper frame 3 at this time is
This is regulated by activating the upper frame lift detector 15, and the extension operation of the lifting jack 9 is stopped. Subsequently, the upper claw release jack 10 is operated to push down the upper claw release ring 12 and release the upper claw 7. Whether or not the upper claw 8 is completely released is detected by the upper claw release detector 19 (FIG. 3E).

(F) Next, from the state of (E), the upper frame 3 is lowered by shortening the lifting jack 9 by using the engagement portion between the lower claw 8 and the rod 1 as a reaction force support portion. The jerk reduction detector 17 detects that the upper frame 3 has descended by a predetermined distance (FIG. 3F).

(G) Next, the pressure oil is removed from the upper claw release jack 10, and the upper claw 7 is returned to its old position by the restoring force of the spring 5, and engaged with the rod 1. The upper claw release detector 1 detects the engagement of the upper claw 7 with the rod 1.
9 (Figure 3G).

This returns the device 2 to its initial state,
Complete one cycle of lowering step.

Based on the above-mentioned operation, the lifting jack device 2 can be operated smoothly when used alone, but as shown in Fig. When two lifting jack devices are operated at the same time, the operation of each device 2 gradually slows down, because in the past, the operation of each device 2 was operated without strictly synchronizing the operations.
The load borne by the device 2 that started descending in advance is applied to the other device 2 that operates later through the rigid horizontal member, and the operation of the first half of (B) or (E) of the latter device 2 is hindered. Therefore, there was a problem that the device 2 could not be lowered without releasing the engaging claws 7, 8 of the frame that directly supports the heavy load of the device 2. Note that when these two groups of devices are raised, this phenomenon does not occur for the following reason. In other words, when ascending, if there is a delay in the ascending operation of each lifting jack device 2 that is interconnected by a rigid horizontal member, the load borne by the device 2 that operates later will be transferred through the rigid horizontal member to advance the upward movement. If the load is gradually applied to the second device 2 and further exceeds the capability range of the latter device 2, only the second device 2 will be unable to rise. However, other lagging devices 2
The load is decreasing and it continues to rise without stopping. As the device 2 rises, the load of the device 2 that is unable to rise gradually returns to the former device 2, and when it falls within the capacity of the latter device 2, the device 2 starts rising again. start.
In this way, by repeating this phenomenon with a slight height difference between each lifting jack device 2, even if each device 2 is connected by a rigid horizontal member, the individual devices 2 can be synchronized. Even if it is not removed, these two groups of devices as a whole continue to rise without falling into a disabled state.

In view of the above points, the present invention is designed to smoothly operate a group of lifting jacks when a heavy object is lowered by a group of lifting jacks connected to each other by rigid horizontal members, etc. It is.

To achieve this objective, the present invention firstly provides that in its lowering method, during the operation of each lifting jack,
The basic process is starting, stopping, and changing the engagement of the upper frame's engaging claws and the lower frame's engaging claws with the rods in each lifting jack device (steps (A)→(B) or (D)→(E) above). ), etc., and in the middle of this mesh alternation process, a process of detecting and adjusting the relative level difference (height difference) between each lifting jack device was included. Second, the present invention provides, in addition to the hydraulic and electric circuits that operate each lifting jack device and its control device, relative level detection means and nail engagement state detection means for transmitting information necessary for the adjustment work, and these information. Based on this, it was decided to provide a central control device to coordinate the operation of each lifting jack device.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 4, 2 is the second
The lifting jack device shown in the figure is shown, each of which is provided with hydraulic and electrical circuits 21 for operation.

The hydraulic pipe 22 is for extending the lifting jack 9,
3 is for shortening the same, 24 is for operating the upper claw release jack 10, and 25 is for operating the lower claw release jack 11. This operating hydraulic and electric circuit 21
are each connected to a terminal control device 26, and operate each lifting jack device 2 in response to instructions from the device 26. The operation is as described in the above (A) → (G), and each terminal control device 26 is connected to each detector 15, 16, 1 attached to the lifting jack device 2.
7, 18, 19, and 20 indicating that each process has been completed, and sends an instruction signal 28 to the operating hydraulic pressure and electric circuit 21 in order to start the next process.

In the embodiment, the heavy load of each lifting jack device 2 is directly supported by the upper frame 3, and a relative level detection means 29 is attached to one end of the frame 3. This relative level detection means 29 detects the relative level difference between the upper frames 3 of each lifting jack device 2, and can transmit this as an electric signal. -Refer to Publication No. 20412). Signal 3 sent from this relative level detection means 29
0 is sent to the central controller 31 with or without the terminal controller 26.

The central control device 31 receives the level signal 30 from the relative level detection means 29, calculates the level difference with the other devices 2 based on the level of the one lifting jack device 2 at the highest level, and calculates the level difference between the levels of the other devices 2. If the difference exceeds a preset level difference tolerance, a level adjustment signal 32 is sent to the terminal control device 26 that controls the corresponding lifting jack device 2 until the difference falls within the tolerance. . Terminal control device 26 that received this signal 32
While receiving this signal 32, the elevating jack 9 is extended to align the level of the upper frame 3 with respect to the elevating jack device 2 which is the reference. In addition, to this central control device 31, upper claw and lower claw release detectors 1 are transmitted from each terminal control device 26.
9 and 20 signals 33 are sent from the central control device 31 to the terminal control device 2.
6, a synchronization control signal 34 is sent to synchronize and lower each upper frame 3.

Next, a series of procedures for lowering two groups of lifting jack devices connected to each other by a rigid horizontal member or the like using the device configured as described above will be generally explained.

(a) Initial state The lifting jack 9 of each lifting jack device 2 is in a shortened state, and the upper claw 7 and lower claw 8 are both engaged with the rod 1 (see FIG. 3A).

(b) Release process of the lower frame 4 By turning on the operating hydraulic pressure and the electric circuit for shortening the lifting jack in the electric circuit 21 using each terminal control device 26, the lifting jack 9 in the shortened state is further slightly moved. The upper claw 8 and the rod 1 are disengaged from each other. When the lower frame 4 rises to a predetermined position, the lower frame rise detector 18 turns "ON", this signal is sent to the terminal control device 26, and the device 26 turns on the electric circuit for shortening the lifting jack. OFF”
This causes the lifting jack 9 to stop shortening.
Subsequently, each terminal control device 26 turns on the hydraulic pressure for operation and the electric circuit for operating the lower claw release jack in the electric circuit 21 to operate the lower claw release jack 11, and pushes down the lower claw release ring 13 to release the lower claw. 8 is completely released from the rod 1 (see Figure 3B).

(c) Lowering process of the lower frame 4 When the lower claw 8 is pushed down, the lower claw release detector 2
0 becomes "ON" and this signal is sent to each terminal control device 26, which turns the hydraulic pressure for operation and the electric circuit for elevating jack extension operation in the electric circuit 21 "ON", and the elevating jack 9 is extended downward, and the lower frame 4 is lowered. When the lower frame 4 is lowered to a predetermined position, the elevating jack extension detector 16 is turned "ON", and the electric circuit for operating the elevating jack extension is turned "OFF" by the terminal control device 26 to which this signal is sent. Lifting jack 9
The extension of the lower frame 4 is stopped, and the lowering of the lower frame 4 is stopped (see FIG. 3C).

(d) Engaging process of the lower frame 4 Next, the electric circuit for operating the lower claw release jack is turned OFF using each terminal control device 26 to release the downward force of the upper claw release jack 11 on the lower claw 8. , the lower claw 8 is returned to its old position by the restoring force of the spring 6, and engaged with the rod 1 (see FIG. 3D).

(e) Release process of upper frame 3 When the lower claw 8 engages with the rod 1 in (d) above,
The lower claw release detector 20 becomes "OFF", and each terminal control device 26 receives the signal and turns on the hydraulic pressure for operation and the electric circuit for elevating jack extension in the electric circuit 21, and moves the elevating jack 9 upward. The upper frame 3 is raised to release the engagement between the upper claw 7 and the rod 1. When the upper frame 3 rises slightly and reaches a predetermined position, the upper frame rise detector 15 turns "ON", and the terminal control device 26 receiving this signal turns the electric circuit for operating the elevating jack extension "OFF". ” and stops the elevating jack 9 from extending. Continue each terminal control device 26
Turn on the operating hydraulic pressure and the electrical circuit for operating the upper claw release jack in the electric circuit 21 to operate the upper claw release jack 10, push down the upper claw release ring 12, and completely remove the upper claw 7 from the rod 1. (See Figure 3E).

(F) Lowering process of the upper frame 3 When the upper claw 7 is pushed down, the upper claw release detector 19 turns "ON" and this signal 33 is sent to the central control device 31 via each terminal control device 26.
The central control device 31 controls all the lifting jack devices 2.
"ON" signal 33 from upper claw release detector 19
The lifting jack device 2, which has completed the same process in advance, is kept on standby until the same process is sent.

After confirming that the "ON" signal 33 is sent from the last lifting jack device 2 and that the upper claw release process has been completed in all lifting jack devices 2, the central controller 31 detects the relative level of each lifting jack device 2. receiving a signal 30 from means 29;
Detects the relative level of the reference section.

Based on this detection, the central control device 31 determines whether the level difference between the upper frame 3 of one lifting jack device 2 at the highest level and the upper frame 3 of the other devices 2 is within a tolerance value. As a result of this judgment, if the level difference exceeds the allowable value, the level difference is increased beyond the allowable value using the level of the first upper frame 3 at the highest level as a reference until the level difference becomes within the allowable value. A signal 32 is sent to extend the lifting jack 9 to the terminal control device 26 which activates the upper frame 3 at a lower level.

Upon receiving this signal, the terminal control device 26 turns on the operating hydraulic pressure and the electric circuit for elevating jack extension in the electric circuit 21, extends the elevating jack 9 in accordance with the reception time, and raises the upper frame 3.

After confirming the completion of the adjusting and lifting process of the full lifting jack device 2 by the central controller 31,
A signal 34 is transmitted from the central control device 31 to all the terminal control devices 26 to simultaneously start shortening the lifting jacks 9 of each lifting jack device 2.

Each terminal control device 2 that received this start signal 34
6, the hydraulic pressure for operation and the electric circuit for shortening the lifting jacks of the electric circuit 21 are turned ON all at once, and each lifting jack 9 is shortened to lower the upper frame 3. When the upper frame 3 is lowered to a predetermined position, the jack shortening detector 17 turns "ON", and each terminal control device 26 receiving this signal turns the electric circuit for shortening the lifting jack to "OFF", and the jack shortens. Stop the shortening of 9 and move the upper frame 3
(See Figure 3 F).

(g) Engaging process of upper frame 3 Next, each terminal control device 26 turns the electric circuit for operating the upper claw release jack ``OFF'' to release the downward force of the upper claw release jack 10 on the upper claw 7, The upper claw 7 is returned to its old position by the restoring force of the spring 5, and the upper claw 7 is engaged with the rod 1 (see FIG. 3G). Through the above operations, each lifting jack device 2 returns to its initial state, completing one cycle of the lowering process in the device group. Note that the central control device 31 also synchronizes the starting and stopping of the device group.

As described above, the lowering method of the present invention includes the step of adjusting the level difference of each frame immediately before lowering the frame that directly supports the load of the heavy object of each lifting jack device, and performing the necessary operations. Since they are configured to be synchronized, these devices connected to each other by rigid horizontal members can be smoothly lowered without falling into a state where they cannot be lowered as in the conventional case. The present inventors conducted the following experiment to confirm this result. That is, as shown in Fig. 5, there is a lifting jack device 2 in which highly rigid horizontal members b surrounding a concrete structure a are arranged on all sides.
It was supported by A, 2B, 2C, and 2D and lowered. Figure 6 shows experimental data using the conventional descending method.
While the loads borne by B and 2D became "0," the loads borne by the other two devices 2A and 2C exceeded the allowable load, making it impossible for them to descend. On the other hand, the seventh
As shown in the figure, when the method of the present invention is used, although there is an increase or decrease in the load borne by each device 2A, 2B, 2C, and 2D, all of them are within the allowable load value and no descent stop occurs. It worked smoothly without any issues.

Furthermore, the device of the present invention is not only equipped with a central control device, relative level detection means, and nail engagement state detection means necessary for the above operation, but also has many of the various signals sent from each detector by a terminal control device. Since the system is structured so that only the minimum necessary signals are sent to the central control unit, fewer signals are sent between the two control units, preventing the generation of erroneous signals, and simplifying the wiring between the two. Furthermore, the control program of the central controller can be simplified.

In the above embodiments, the upper frame of each lifting jack device is made to bear the load of the heavy object, but it is also possible to make the lower frame bear the load. In this case, the relative level detection means is attached to the lower frame, and
During the steps (g) and (c), the lower frame lowering step, the level of each lower frame is adjusted and the subsequent lowering operations are synchronized.

As explained above, the present invention does not rely on improving the performance of each lifting jack device, but by finely regulating the operation of each lifting jack device.
This project proposes an efficient and smooth technology for lowering heavy objects.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a construction site showing the implementation status of a method for elevating heavy objects using a group of elevating jack devices; Fig. 2 is a schematic cross-sectional view of the elevating jack device;
Fig. 3 is an explanatory diagram of the lowering operation of the device, Fig. 4 is a block diagram of the device of the present invention, Fig. 5 is a schematic plan view of the construction site showing the experimental situation, and Fig. 6 is an experimental data diagram for the conventional lowering method. , FIG. 7 is a diagram of experimental data obtained by the method of the present invention. 1... Rod, 2... Lifting jack device, 3...
...Upper frame, 3a, 4a...Tapered surface, 4...
...Lower frame, 5, 6... Spring, 7, 8... Engaging claw, 9... Lifting jack, 10... Upper claw release jack, 11... Lower claw release jack, 12... Upper claw release ring, 13...Lower claw release ring, 14...
...Detector mounting rod, 15...Upper frame rise detector, 16...Judge extension detector, 17...Judge shortening detector, 18...Lower frame rise detector, 19...Upper claw release detector, 20...Lower claw release detector, 21...Operating hydraulic pressure and electric circuit,
26... terminal control device, 29... relative level detection means, 31... central control device.

Claims (1)

[Scope of Claims] 1. A pair of upper and lower frames each having engaging claws that engage with a load-supporting rod extending in a vertical direction are connected via an elevating jack, and the upper and lower engaging claws are engaged with and released from the load-supporting rod. and a plurality of elevating jack devices that move up and down on the rod by a chain movement of expansion and contraction of the elevating jacks are positioned substantially horizontally, and each of the elevating jack devices are connected to each other by a rigid horizontal member or the like and operated simultaneously. , in a method for lifting and lowering a heavy object supported by the device group, at least synchronizing the start and stop of all the lifting jack devices, and directly supporting the load of the heavy object among the upper and lower frames of each lifting jack device. At the stage when the engaging claw of the side frame is released from the rod, the frame is put on standby, and when all the lifting jack devices are in the standby state of the frame, quantitatively detecting the relative level difference between the respective frames, When the level difference is greater than or equal to the allowable value, the level difference is adjusted by further expanding or contracting the lifting jack of one of the lifting jack devices, after which each frame is synchronized and lowered all at once. Lowering of heavy objects by a group of lifting jacks connected to each other by rigid horizontal members etc., characterized in that processes other than the simultaneous lowering operation and the above-mentioned starting and stopping are operated for each lifting jack device. Method. 2 A pair of upper and lower frames equipped with engaging claws that engage with load-supporting rods extending in the vertical direction are connected via a lifting jack, and the upper and lower engaging claws engage and disengage from the load-supporting rod, and the lifting jacks extend and contract. A plurality of elevating jack devices that move up and down on the rod by chain actions are positioned substantially horizontally, and each elevating jack device is connected to each other by a rigid horizontal member, etc., operated simultaneously, and supported by the group of devices. Quantitatively detects the operating hydraulic and electric circuits and their control devices that operate each lifting jack individually and independently, and the relative level difference between each lifting jack in a device that lifts and lowers heavy objects. and a relative level detection means that transmits this as an electric signal, and detects the engagement and release state of the engagement claw of each lifting jack device with respect to the rod,
A nail engagement state detection means transmits this as an electric signal, and the detection signals sent from the relative level detection means and the nail engagement state detection means are received and compared and processed to generate a level difference adjustment signal, a synchronization signal, etc. A device for lowering a heavy object using a group of lifting jacks, characterized in that the device comprises a central control device that sends a required signal to a control device of each of the lifting jack devices.