JP5580721B2 - Operation method of fixed cable crane - Google Patents

Description

  The present invention relates to a method for operating a fixed cable crane.

  Conventionally, various types of cable cranes are used in civil works such as dam construction. The cable crane is a crane of a type in which a trolley traverses on a main rope stretched between two points, and is a fixed cable crane in which positions of both ends of the main rope are fixed (for example, refer to the prior art in Patent Document 1). ), Traveling type and railing type cable cranes in which the position of one end or both ends of the main rope moves. In the fixed cable crane, since the positions of both ends of the main rope are fixed, the suspended load is unloaded immediately below the main rope.

  The type and number of cranes used in the construction are determined according to the construction content and site conditions. When two fixed cable cranes are used side by side, when carrying suspended loads exceeding the rated load of the crane, two suspensions are used.

Japanese Patent No. 4131092

  However, when suspending using two fixed cable cranes, depending on the skill of the crane operator and signal personnel, differences in crane specifications, wireless interruptions, etc., the position of the two crane suspensions An error may occur. If an error occurs in the position of the two hanging tools, there is a risk that the sling will come off and the suspended load will fall. In particular, when two cranes are installed apart from each other, it is difficult to perform the suspension operation only by the operator's visual observation.

  If a fixed cable crane is used, in order to unload a suspended load at a location other than directly under the main rope, temporarily place it directly under the main rope, then lift it again with a rough terrain crane, etc., and move to the target location. There is a need. If it is not possible to secure a travel / installation place such as a rough terrain crane, it becomes difficult to carry suspended loads.

  Furthermore, the cable crane is not very suitable for precise work because of the influence of bounce due to the deflection of the main rope.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to enable reliable suspension operation with two cable cranes, and to unload suspended loads in a wide range. It is to provide a method of operating a fixed cable crane that can be used.

In order to achieve the above-described object, the present invention provides a method for operating a first fixed cable crane and a second fixed cable crane arranged in parallel , wherein the first I-shaped steel is used as the first fixed steel. The first fixed cable crane and the second fixed cable crane are hung over the first fixed cable crane and the second fixed cable crane. When a suspended load is hung on the I-shaped steel overhang portion, a counterweight is hung on the first I-shaped steel so that the first I-shaped steel is held horizontally, and the first fixed cable crane The position signal of the suspension and the suspension of the second fixed cable crane is detected, and based on the position signal and the operation signal of the first fixed cable crane, the first fixed cable crane Suspension and said A method of operating a fixed cable crane, characterized in that the two stationary cable crane slings to output an operation signal to the second fixed cable crane to move synchronously.

  The position signal is a signal related to the traversing position and the winding position, and the operation signal is a signal related to the traversing speed and the winding speed.

In the present invention, for example, the first type I item having a suspension hole in the web is suspended and suspended over the suspension of the first fixed cable crane and the suspension of the second fixed cable crane. A third hanging tool is installed in the hole and the suspended load is hung .

In the present invention, instead of the first I-shaped steel, the second I-shaped steel provided with an electric hoist and an angle detector is extended to the suspension side of the first fixed cable crane . It may be hung over the suspension of the fixed cable crane and the suspension of the second fixed cable crane. In this case, a fourth load is installed on the electric hoist to suspend the suspended load. Then, an angle detector is used to determine the height difference between the first fixed cable crane suspension and the second fixed cable crane suspension generated when the electric hoist traverses along the second I-shaped steel. Detect and finely adjust the position of the second fixed cable crane suspension so that the second I-shaped steel is held horizontally.

  In the present invention, the first fixed cable crane is based on the position signal of the first fixed cable crane suspension and the second fixed cable crane suspension and the operation signal of the first fixed cable crane. An operation signal is output to the second fixed cable crane so that the crane lifting tool and the second fixed cable crane lifting tool move in synchronization. Therefore, by operating the first fixed cable crane, the first fixed cable crane lifting tool and the second fixed cable crane lifting tool operate simultaneously, and the two cable cranes perform the suspension operation. It can be done reliably.

  In addition, the I-shaped steel is suspended by hanging over the first fixed cable crane suspension and the second fixed cable crane suspension, and the third suspension or electric hoist is attached to the I-shaped steel. This makes it possible to unload suspended loads over a wide range.

  ADVANTAGE OF THE INVENTION According to this invention, the operation method of the fixed cable crane which can perform the suspension operation with two cable cranes reliably and can unload a suspended load in a wide range can be provided.

Diagram showing the outline of two fixed cable cranes Input / output schematic of two fixed cable cranes Diagram showing correspondence between notch and binary signal Vertical section of dam 12 The figure which shows the state which suspended the I-type steel 57 which has the suspension hole 61 in the No. 1 hanging tool 17 and the No. 2 hanging tool 19. The figure which shows the state which suspended the hanging load 67 on the overhang | projection part 87 of I-shaped steel 57 The figure which shows the state which suspended the I-type steel 83 which has the electric hoist 71 in the No. 1 hanging tool 17 and the No. 2 hanging tool 19.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of two fixed cable cranes. In the first embodiment, as shown in FIG. 1, a No. 1 fixed cable crane 1 that is a first fixed cable crane, and a No. 2 fixed cable crane 3 that is a second fixed cable crane, It is installed in parallel above the valley 28 where the dam is planned. The No. 1 fixed cable crane 1 is installed downstream from the shaft of the dam 12 (FIG. 4) to be constructed, and the No. 2 fixed cable crane 3 is installed further downstream.

  The No. 1 fixed cable crane 1 includes a pair of towers 5, a main rope 9, a No. 1 trolley 13, and the like. The tower 5 is fixed on a foundation 29 provided on the left bank and the right bank of the valley 28. The main rope 9 is suspended between the opposing towers 5. The No. 1 trolley 13 includes a traveling portion 21, a hoisting wire 25, a No. 1 hanging tool 17 that is a hanging tool of the first fixed cable crane, a plurality of wires and winches (not shown), and the like. The traveling unit 21 traverses along the main rope 9 as shown by an arrow A by a wire or winch (not shown). The No. 1 hanging tool 17 is suspended from the traveling unit 21 by the hoisting wire 25. The No. 1 hanger 17 moves up and down as indicated by an arrow C by the hoisting wire 25 and a winch (not shown).

  The No. 2 fixed cable crane 3 includes a pair of towers 7, main ropes 11, No. 2 trolleys 15 and the like. The tower 7 is fixed on a foundation 29 provided on the left bank and the right bank of the valley 28. The main rope 11 is suspended between opposing towers 7. The No. 2 trolley 15 includes a traveling unit 23, a hoisting wire 27, a No. 2 hanging tool 19 that is a hanging tool of a second fixed cable crane, a plurality of wires and winches (not shown), and the like. The traveling unit 23 traverses along the main rope 11 as shown by an arrow B by a wire or winch (not shown). The No. 2 hanging tool 19 is suspended from the traveling unit 23 by the hoisting wire 27. The No. 2 hanging tool 19 moves in the vertical direction as indicated by an arrow D by the winding wire 27 or a winch (not shown).

  FIG. 2 shows an input / output schematic diagram of two fixed cable cranes. FIG. 3 is a diagram illustrating a correspondence relationship between the notch and the binary signal. The No. 1 fixed cable crane 1 and No. 2 fixed cable crane 3 are normally controlled independently by hand. In the case of normal manual operation, as shown in FIG. 2, a notch signal is output from the No. 1 operation unit 31 (operation lever), and an operation signal is input to the No. 1 control panel 33 as indicated by an arrow 45. This operation signal is a signal relating to the traversing speed and winding speed of the No. 1 trolley 13. The operation signal is output as an operation from the No. 1 control panel 33 to the No. 1 trolley 13 as indicated by an arrow 47.

  The No. 2 operation unit 37 (operating lever) is an absolute encoder, which outputs a 10-bit binary signal and inputs an operation signal to the No. 2 control panel 39 as indicated by an arrow 49. This operation signal is a signal relating to the traverse speed and winding speed of the No. 2 trolley 15. The operation signal is output as an operation from the No. 2 control panel 39 to the No. 2 trolley 15 as indicated by an arrow 51. The binary signal of the No. 2 operation unit 37 (operation lever) outputs the numbers shown in FIG. 3 to the notch of the No. 1 operation unit 31 (operation lever).

  FIG. 4 is a vertical sectional view of the dam 12. When the dam 12 is constructed, concrete or the like is transported using the No. 1 fixed cable crane 1 and the No. 2 fixed cable crane 3. As shown in FIG. 4, the unloading positions of the No. 1 fixed cable crane 1 and No. 2 fixed cable crane 3 are directly below the main rope 9 and the main rope 11, respectively. Therefore, the No. 2 fixed cable crane 3 cannot be unloaded after the downstream surface 14 of the dam 12 is constructed to a position directly below the main rope 11, and cannot be used alone.

  When the No. 2 fixed cable crane 3 is not used alone, the No. 1 fixed cable crane 1 and the No. 2 fixed cable crane 3 are controlled and operated at the same time to perform the suspension operation as necessary. The When simultaneously controlling and operating, the command system indicated by the arrow 49 shown in FIG. 2 is disconnected, and the independent operation of the No. 2 fixed cable crane 3 is terminated. Then, as shown in FIG. 2, the operation signal output from the No. 1 operation unit 31 (operation lever) is input to the No. 1 control panel 33 and the synchro control panel 43 as indicated by arrows 45 and 53. This operation signal is a signal relating to the traversing speed and winding speed of the No. 1 trolley 13. The operation signal input to the No. 1 control panel 33 is output to the No. 1 trolley 13 as indicated by an arrow 47.

  Further, the position / height of the No. 1 suspension 17 is detected by the No. 1 position detector 35, and a position signal is input to the synchro control panel 43 as indicated by an arrow 55. This position signal is a signal related to the traversing position and the winding position of the No. 1 hanging tool 17. At the same time, the position / height of the No. 2 hanging tool 19 is detected by the No. 2 position detector 41, and a position signal is input to the synchro control panel 43 as indicated by an arrow 57. This position signal is a signal related to the traversing position and the winding position of the No. 2 hanging tool 19.

  The synchro control panel 43 is based on the operation signal received from the No. 1 operation unit 31 (operation lever), the position signal received from the No. 1 position detector 35, and the position signal received from the No. 2 position detector 41. PID control is performed and an optimal operation signal is output so that the No. 1 hanging tool 17 and the No. 2 hanging tool 19 move synchronously. The operation signal is input to the No. 2 control panel 39 as indicated by an arrow 59. The operation signal input to the No. 2 control panel 39 is output to the No. 2 trolley 15 as indicated by an arrow 51.

  When controlling the No. 1 fixed cable crane 1 and the No. 2 fixed cable crane 3 at the same time, the binary for the notch signal is used to prevent sudden fluctuations in the speed command for the No. 2 fixed cable crane 3. The signal fluctuation range is limited to the front and rear 20. For example, when a 1-notch command is issued by the No. 1 operation unit 31, the binary signal corresponding to 1 notch is 34 as shown in FIG. Between 54.

  Note that switching between normal manual operation and simultaneous operation using the synchro control panel 43, display of errors between the No. 1 hanging tool 17 and the No. 2 hanging tool 19, and the like are performed using a display screen such as a touch panel. .

  FIG. 5 is a diagram showing a state in which the I-shaped steel 57 having the suspension hole 61 is suspended from the No. 1 hanging tool 17 and the No. 2 hanging tool 19. When the No. 1 fixed cable crane 1 and the No. 2 fixed cable crane 3 are simultaneously controlled and suspended, the No. 1 fixed cable crane 1 is suspended as shown in FIG. The I-shaped steel 57, which is the first I-shaped steel, is suspended and hung on the second hanging tool 19 of the tool 17 and the fixed cable crane 3 of No. 2. The No. 1 hanging tool 17 and the No. 2 hanging tool 19 are connected to a connecting member 53 and a connecting member 55 attached to the I-shaped steel 57, respectively. The I-shaped steel 57 is suspended and hung so as to project toward the No. 1 suspension 17 side.

  The I-shaped steel 57 has a suspension hole 61 in the web 59. The I-shaped steel 57 is provided with a hanging tool 65 as a third hanging tool in an arbitrary hanging hole 61. The hanging tool 65 is made of, for example, a wire and a shackle. By freely selecting the suspension hole 61 in which the suspension tool 65 is installed, the suspended load 67 suspended from the suspension tool 65 can be lowered to a place other than directly below the main rope 9 and the main rope 11. In addition, as shown in FIG. 5, when installing the hanging tool 65 in the hanging hole 61 in the position between the No. 1 hanging tool 17 and the No. 2 hanging tool 19, and hanging the hanging load 67, as shown in FIG. The counter weight 69 is not necessary.

  FIG. 6 is a view showing a state in which the suspended load 67 is suspended from the projecting portion 87 of the I-shaped steel 57. In FIG. 6, the hanger 65 is installed in the overhanging portion 87 of the I-shaped steel 57, that is, the hanger 61 at a position that is out of the space between the first hanger 17 and the second hanger 19. As shown in FIG. 6, when the suspended load 67 is suspended from the hanging tool 65 installed on the projecting portion 87 of the I-shaped steel 57, a counterweight 69 is suspended on the other side in order to hold the I-shaped steel 57 horizontally.

  Thus, according to the first embodiment, two cable cranes can be operated by controlling the No. 2 fixed cable crane 3 to operate simultaneously by operating the No. 1 fixed cable crane 1. The suspension operation can be performed reliably. Further, by installing the lifting tool 65 in the arbitrary suspension hole 61 of the I-shaped steel 57, the unloading range of the suspended load 67 can be expanded.

  Next, a second embodiment will be described. The No. 1 fixed cable crane 1 and No. 2 fixed cable crane 3 used in the second embodiment are the same as those in the first embodiment.

  FIG. 7 is a view showing a state in which the I-shaped steel 83 having the electric hoist 71 is suspended from the No. 1 hanging tool 17 and the No. 2 hanging tool 19. FIG. 7A shows a state in which the I-shaped steel 83 is kept horizontal.

  In the second embodiment, when the No. 1 fixed cable crane 1 and the No. 2 fixed cable crane 3 are controlled and operated simultaneously, instead of the I-shaped steel 57 shown in FIGS. 5 and 6, FIG. As shown in (a) of FIG. 1, an I-shaped steel 83, which is a second I-shaped steel, is attached to the No. 1 hanging tool 17 of the No. 1 fixed cable crane 1 and the No. 2 hanging tool 19 of the No. 2 fixed cable crane 3. Hanging over and hanging. The No. 1 hanging tool 17 and the No. 2 hanging tool 19 are connected to a connecting member 53 and a connecting member 55 attached to the I-shaped steel 83, respectively. The I-shaped steel 83 is suspended and hung so as to project toward the No. 1 suspension 17 side.

  The angle detector 79 is attached to the I-shaped steel 83 in the vicinity of the end of the No. 2 hanging tool 19 side. Moreover, the electric hoist 71 is attached to the I-shaped steel 83. The electric hoist 71 includes a traveling unit 73, a hoisting device 75, a hanging tool 77 as a fourth hanging tool, and the like. The traveling unit 73 traverses along the I-shaped steel 83 as indicated by an arrow E. The hoisting device 75 moves the hanging tool 77 in the vertical direction as indicated by an arrow F. Further, the counterweight 81 is attached to the I-shaped steel 83 in the vicinity of the end portion on the No. 2 suspension 19 side.

  In the second embodiment, an electric hoist 71, an angle detector 79, and a counterweight 81 are attached to the I-shaped steel 83, thereby obtaining a Teruha. By moving the electric hoist 71 along the I-shaped steel 83, the suspended load 85 suspended from the suspension tool 77 can be lowered to a place other than directly below the main rope 9 and the main rope 11. The operation of Telha is performed visually by a signal person at the place where the suspended load 85 is unloaded, so that it is possible to perform an operation that requires fine adjustment such as moving the slide formwork and the internal structure.

  FIG. 7B shows a state in which a difference in height occurs between the No. 1 hanging tool 17 and the No. 2 hanging tool 19. When the electric hoist 71 moves along the I-shaped steel 83, the deflection of the wire changes due to fluctuations in the load applied to the No. 1 suspension 17 and the No. 2 suspension 19, so that the winding wire 25 and the winding wire 27 Are the same, the positions of the No. 1 hanger 17 and the No. 2 hanger 19 fluctuate, and the I-shaped steel 83 is not horizontal.

  The angle detector 79 detects the angle of the I-shaped steel 83 and inputs it to the synchro control panel 43 shown in FIG. 2 by radio. When there is a difference in height between the No. 1 hanging tool 17 and the No. 2 hanging tool 19, the synchro control panel 43 takes into account the signal of the angle detector 79 and the position of the No. 2 hanging tool 19, that is, the hoisting wire 27. The I-shaped steel 83 is kept horizontal by finely adjusting the winding condition.

  According to the second embodiment, similarly to the first embodiment, by controlling the No. 2 fixed cable crane 3 to operate simultaneously by operating the No. 1 fixed cable crane 1, Suspension operation by two cable cranes can be performed reliably. Further, by attaching the electric hoist 71 to the I-shaped steel 83, the unloading range of the suspended load 85 can be expanded, and it is possible to deal with precision work that requires fine adjustment.

  In the first and second embodiments, the construction site of the dam 12 has been described as an example, but the present invention can also be applied to a construction site of a building other than the dam. The operation lever of No. 1 fixed cable crane 1 is a notch output type and the operation lever of No. 2 fixed cable crane 3 is an absolute encoder. However, the specifications of the two operation levers are not limited to this.

  The method of suspending the I-shaped steel 57 of the first embodiment and the I-shaped steel 83 of the second embodiment is not limited to the method shown in FIGS. 5 to 7, but the I-shaped steel 57 and the I-shaped steel 83 are suspended by No. 1. Any method can be used as long as it can be reliably hung from the tool 17 and the No. 2 hanging tool 19. Further, in the first embodiment and the second embodiment, the I-shaped steel 57 and the I-shaped steel 83 are suspended and hung so as to project to the side of the hanger 17, but the hanging position of the I-shaped steel is Not limited to this. The I-shaped steel may be bridged so as not to protrude from the position of the hanging tool.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs.

1 ......... No.1 fixed cable crane 3 ......... No.12 fixed cable crane 9,11 ......... Main rope 13 ......... No.1 trolley 15 ......... No.2 trolley 17 ......... No.1 lifting device 19 ......... No. 2 lifting device 57, 83 ......... I-shaped steel 59 ......... Web 61 ......... Hanging hole 65, 77 ......... Hanging device 69, 81 ......... Counter weight 71 ......... Electric hoist 79 ……… Angle detector 87 ……… Overhang

Claims (4)

A method of operating a first fixed cable crane and a second fixed cable crane arranged in parallel,
A first stationary cable crane suspension and a second stationary cable crane suspension so as to project the first I-shaped steel toward the first stationary cable crane suspension; Hanging over and hanging,
When hanging a suspended load on the overhanging portion of the first I-shaped steel, a counterweight is hung on the first I-shaped steel so that the first I-shaped steel is held horizontally,
Detecting position signals of the first fixed cable crane suspension and the second fixed cable crane suspension, and based on the position signal and the operation signal of the first fixed cable crane, An operation signal is output to the second fixed cable crane so that the lifting tool of the first fixed cable crane and the lifting tool of the second fixed cable crane move synchronously. To operate a fixed cable crane. The position signal is a signal related to a traversing position and a winding position,
The operation method of the fixed cable crane according to claim 1, wherein the operation signal is a signal relating to a traverse speed and a winding speed. The first type I steel, have a hole hanging web, the hanging hole on the third stationary according to claim 1 or claim 2, characterized in that suspend the suspended load by installing the hanger How to operate a cable crane. In place of the first I-shaped steel, the second fixed I-type steel provided with an electric hoist and an angle detector is extended to the suspension side of the first fixed cable crane. Suspended over the suspension of the second cable crane and the second fixed cable crane,
A fourth hanging tool is installed on the electric hoist to hang a suspended load,
The angle detector detects a height difference between the suspension of the first fixed cable crane and the suspension of the second fixed cable crane caused by the electric hoist traversing along the second I-shaped steel. The position of the suspension of the second fixed cable crane is finely adjusted so that the second I-shaped steel is held horizontally . The operation method of the fixed cable crane as described in any one .

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