JPS628399B2 - - Google Patents

Description

[Detailed Description of the Invention] Recently, the demand for electric power in urban areas has been increasing steadily, and large-scale power generation and transmission plans are being advanced in various places. The power transmission towers necessary for power transmission are becoming larger year by year as the power of power transmission increases, and at the same time, power transmission routes are being forced to move to mountainous areas far from human settlements due to environmental issues and other factors. As steel towers become larger and the working environment worsens, there is an urgent need to save labor by introducing high-efficiency machinery for steel tower construction work.
Plans to adopt full-scale climbing cranes are currently underway. Climbing cranes are far superior in performance and safety compared to conventional gin-pole and derrick-type cranes, but when installed in mountainous areas where road conditions and installation conditions are poor, transportation, crane installation, assembly, and removal may be difficult. There were many restrictions in terms of the technology, and there was almost no adoption. Therefore, typical lifting devices for assembling power transmission towers used in mountainous areas have been the ``gin pole'' shown in Figures 1 to 2 and the ``derrick type tower crane'' shown in Figure 2.

As shown in Fig. 1, the "gin pole" method places a gin pole a on the ground, fixes one end with a fixed anchor b, and then raises it using a winch c to form a lifting device. As shown in Figure 1, the steel tower
After assembling d ₁ and d ₂ to a certain height, gin pole a is moved upwards using a wire rope using a steel tower as shown in Figure 1, and the next lifting operation is performed. From then on, the lifting work will be carried out in the same way, changing the gin poles one by one according to the progress of the tower assembly.

As shown in Figure 2, the ``derrick type tower crane'' has jibs b attached to both sides of a central tower a, and a guide tower c arranged at the bottom. In addition, guide tower c has a branch line e from steel tower d at intervals of about 10 meters in height. According to the progress of assembling the steel tower, the guide tower c is used to successively raise the center tower a upward to carry out lifting work.

Of these methods, the former has simple equipment and low equipment costs, but on the other hand, it requires skill in handling and lifting the gin pole, and has problems in terms of workability and safety. There were disadvantages such as the troublesome and time-consuming work required to replenish the plates. The latter was a considerable improvement over the above-mentioned problems, but because it was a derrick type, there were difficulties in workability, such as restrictions on the swinging work range.
In addition, when installing in a mountainous area, it is necessary to place the center tower and the lower ends of the guide towers on both sides at the same horizontal level, so it is necessary to excavate a fairly wide area of ground or build a horizontal foundation using concrete. It was necessary to take measures such as constructing a new one, which required a large amount of effort and expense.
In recent years, from the perspective of environmental protection, geological excavation,
Regulations regarding felling of trees, etc. are becoming more and more strict, and it is becoming increasingly difficult to install such cranes in mountainous areas.

Another method is to use a truck crane, but it cannot be used for assembling steel towers over 100 meters in height or in mountainous areas, and is not a commonly used machine for assembling steel towers.

The present invention mainly relates to a method for constructing a steel tower that enables the use of a climbing crane on unspecified sloped areas such as mountainous areas, and a climbing crane device for the construction.
After supporting the assembly unit, which has an upper plane large enough to fit inside the tower legs and serves as a parts storage area and a workbench so that the upper plane is horizontal, a simple crane is installed on the assembly unit, and assembly is carried out using the simple crane. A method for constructing a steel tower in which a climbing crane is assembled at the center of the tower construction site, and the tower is constructed using the climbing crane; A climbing crane for constructing a steel tower, in which a frame is supported by a required number of extendable and fixable legs extending perpendicularly and downward to the plane, a simple crane is provided around the crane installation plane, and a climbing crane is provided at the center of the crane installation plane. It is related to the device.

Embodiments of the present invention will be described below based on the drawings.
FIG. 3 shows the overall view, and FIGS. 4-4 show the assembled unit. A frame 20 formed by the main frame 1 and the cross beams 2 is supported by extendable and fixable legs 3a, 3b, and 3c having extendable devices 26 provided on the main frame 1 so as to extend vertically downward. The frame frame 20 is provided with an equipment installation stand 21 connected to one side of the frame frame 20, and is detachably attached to the installation stand 21, including a small power generator 5, an assembly winch 6, a support frame 7 having a sheave 22 on the top, A foldable gin pole or a simple crane 12 having the same cargo handling function as the gin pole is provided, and an auxiliary assembly stand 8 is removably connected to the other side of the frame 20. The auxiliary assembly table 8 has a telescopic device (not shown), is supported by telescopic and fixable legs 3d, and is equipped with a lifting ramp 10. Further, a base plate 9 is provided on the upper surface of the frame frame 20 and the auxiliary assembly table 8, and a safety handrail 11 is provided around the periphery. The legs 3a, 3b, 3c, 3d and the pre-installed foundations 4a, 4b, 4c, 4d are the same as the legs 3a, 3b, 3c, 3d.
The mutual positions are determined so that they are erected at points b, 4c, and 4d. In addition to the above configuration, the crane mount 13,
The assembly unit 23 in which the mast elevating guide frame 14, etc. are arranged, and the auxiliary assembly stand 8 are located inside the tower legs 17a, 17b to be constructed.
It is installed in the space surrounded by b.

Here, the functions of each structure of the assembly unit will be described.

Foundations 4a, 4b, 4 shown in Figure 4 and
The legs 3a, 3b, 3c, 3d have the function of supporting the assembly unit 23, the auxiliary assembly table 8, and the crane load applied to the legs 3a, 3b, 3c, and 3d, and transmitting it to the ground. It has a structure in which the length dimensions of the legs 3a, 3b, 3c, and 3d can be expanded/contracted and fixed according to the shape of the unit, and the horizontal level of the top surface of the assembled unit can be maintained by adjusting the expansion/contraction device 26 attached to the legs. It is possible.

Next, the main frame 1 and the crossbeam 2 support the load of the crane and each assembly equipment, and the legs 3
a, 3b, 3c, and 3d, and is further used as a workbench when assembling the crane. In addition, a small power generator 5 attached to the frame 1 supplies power necessary for assembling the crane.
is driven to perform the raising and lowering operation of the gin pole 12 and the hoisting operation of the suspended load. In addition, support frame 7
is for raising and supporting the gin pole 12.

Next, the auxiliary assembly table 8 and the base plate 9 serve as an unloading area and a temporary storage area for each member of the crane, and are also used as a work table during assembly.

In addition, the elevator ramp 10 is used for lifting and lowering workers, and the safety handrail 11 is used to prevent workers from falling.
They are set up respectively.

Next, the gin pole 12 shown in FIG. 4 corresponds to a jib in a jib crane, and the temporary fixing member 27 is a device for temporarily fixing the gin pole 12.

This section describes the climbing crane equipment and the construction procedure for the steel tower.

Simple foundations 4a, 4b, 4c, and 4d shown in FIG. 4 are provided at the location where the climbing crane is installed.

The assembly unit 23 shown in FIG. 4 is transported from a predetermined base to a destination by means of transportation such as a helicopter or a cableway, and the foundation 4a,
4b, 4c, 4d, legs 3a, 3b, 3
The upper surface of the assembled unit 23 is kept horizontal by adjusting the expansion and contraction of the parts c and 3d. Next, secure it to the ground using anchor bolts, etc.

It should be noted that if the length dimensions of the legs 3a, 3b, 3c, and 3d are roughly adjusted in advance according to the height of each foundation surface, only minor adjustments are required on site.

The small power generator 5 shown in FIG. 4, the assembly winch 6, and the support frame 7 shown in FIG. 4 are arranged at predetermined positions of the unit 23, respectively.

An auxiliary assembly table 8, a base plate 9, a lifting ramp 10, and a safety handrail 11 shown in FIG. 4 are arranged at predetermined positions of the unit 23, respectively.

After placing the gin pole 12 shown in FIG. 4 on the upper surface of the base plate 9 and fixing the base part with the pin 18, the wire rope 19 is stretched in a predetermined manner, and the assembly winch 6 is used to assemble the gin pole 12 as shown in FIG. 4. Raise the gin pole 12. Next, the gin pole 12 is temporarily fixed using the temporary fixing device 27, and the tip of the folded gin pole 12 is stretched out into a single shape as shown in FIG.

With the above steps, the assembly unit 23 is completed.

Next, we will transport and unload the various parts of the crane.
Perform temporary storage. First, the crane mount 13 shown in FIG. 4 is lifted and placed in a predetermined position using the gin pole 12, the support frame 7, and the assembly winch 6, and then fixed to the assembly unit 23 using means such as anchor bolts. . Next, the lifting guide frames 14 and 15 shown in FIG. 4 are installed and fixed on the crane pedestal 13 using the same installation method as the crane pedestal 13.

Thereafter, each crane member including the crane mast 16 shown in FIG. 3 is arranged and erected in a predetermined assembly order to complete the crane.

Incidentally, this crane 28 is a climbing type, and there is no need to assemble it in the state shown in FIG. 3 from the beginning. That is, the initial crane assembly can be fully assembled within the functional range of the gin pole 12, and then the masts can be added one by one by the crane itself using the climbing device attached to the crane to achieve the state shown in FIG. 3.

Steel tower construction work involves assembly of small items, welding work, etc., but such work is performed on a work unit, and the necessary lifting work on the work unit is performed using a gin pole. Lifting work for the tower construction work itself will be carried out by a climbing crane, and masts will be added to the climbing crane itself as the tower construction work progresses.

Removal of the crane 28 and assembly unit 23 is, in principle, performed in the reverse order of assembly. However, if the crane and assembly unit 23 are installed inside the constructed steel tower, the completed steel tower will be used to lift and hold the crane and assembly unit 23 horizontally, and the crane will be removed from the specified gap between the tower members. Then, the assembled unit 23 is carried out, and then transported and removed from the outside of the tower using a transport means such as a helicopter or a cableway.

Incidentally, the transportation of the crane, which is a problem related to the above-mentioned installation of the crane, can be satisfactorily solved by increasing the size of the transportation means such as a helicopter or cableway, or by considering dividing the crane into blocks.

In the embodiments described above, the small power generator 5, the assembly winch 6, the support frame 7, etc. are attached separately to the assembly unit 23, but if there are no transportation restrictions, they can be attached to the unit 23 in advance. It is more effective to incorporate it into the ginpole 12
It is also possible to have a single shape from the beginning instead of a foldable type, and furthermore, there are five legs to support the assembled unit.
Although two legs are used to support the auxiliary assembly stand, the number of legs can be increased or decreased as appropriate depending on the installation conditions, and the auxiliary stand may not be necessary depending on the site, so it is not necessarily necessary to provide it.

Next, another example of the assembly unit will be described.

(1) As shown in Figure 5, legs 3a, 3b, 3c, 3
d is added and part of it is jacked 2.
4 or depending on the ground conditions, nails 25a, 2 may be used instead of a foundation such as concrete.
It may also be 5b, 25c, or 25d.

(2) Next, legs 3a, 3b, 3c, 3 shown in Figure 6
There is also a method of increasing d and installing the frame 1 of the assembly unit at a higher position than the tops of the surrounding trees 29. If this method is adopted, 29 trees
It has the advantage of reducing the amount of felling.

(3) Also, in any of the above embodiments, the leg base 4a,
4b, 4c, and 4d are separately provided before installing the unit 23, but it is also possible to fix multiple claws 25a, 25b, 25c, and 25d shown in Fig. 5 or outriggers used in truck cranes, etc. After the unit 23 is attached to the assembly unit 23 and dropped by a helicopter or the like, a hole is dug using a drilling device built into the unit 23, and concrete is filled to construct a crane or the foundation of the unit later. It is also possible.

As described above, the present invention exhibits the following excellent effects.

(i) Since this method uses an assembly unit to assemble a climbing crane, it is possible to introduce a full-scale climbing crane as a lifting device for assembling steel towers mainly in mountainous areas, and it can be used for tower assembly work.
It is expected to improve safety and significantly shorten the construction period.

(ii) By making the legs of the assembled unit expandable and fixed, one unit can be used over a wide range of flat areas or mountainous areas. Therefore, it has versatility for diversion,
Economical efficiency can be improved. In addition, the foundation required for installing the crane can be downsized, and at the same time, the area of earth excavation and tree felling can be reduced.

(iii) By arranging crane assembly equipment such as a small power generator, an assembly winch, a support frame, and a gin pole in an assembly unit, it is possible to standardize the assembly work regardless of the conditions of the tower construction site, and it is possible to assemble the tower at the same time. This eliminates or reduces the hassle of setting up equipment and equipment, making it possible to significantly shorten the tower assembly process.

In addition, with the standardization of work, skilled workers are not required for tower construction work, and work efficiency is improved.
Safety can be improved.

(iv) By removably attaching the auxiliary assembly table and base plate to the assembly unit, it can be used for multiple purposes as an unloading table or temporary storage area for crane components. Therefore, there is no need to provide a separate unloading platform or temporary storage area, so the area required for earth excavation and tree felling can be reduced, the effort and cost required for this can be reduced, and the effect of preventing environmental destruction is significant. In addition, the top surface of the base plate can always be kept horizontal regardless of the terrain, making it ideal for use as a work scaffold.Furthermore, the effective arrangement of lifting ramps and safety handrails improves work efficiency and safety. You can expect it.

[Brief explanation of the drawing]

Figures 1 to 2 are conventional illustrations;
The figure is a side view showing the entire embodiment of the present invention, FIG. 4 is a perspective view of an assembly unit forming a part of the present invention,
FIGS. 4 to 4 are explanatory diagrams showing the assembly order of the present invention,
FIGS. 5 and 6 are side views showing other embodiments of the present invention. 1 is the main frame, 2 is the crossbeam, 3a, 3b, 3
3c and 3d are legs, 4a, 4b, 4c, and 4d are base stands, 8 is an auxiliary assembly stand, 9 is a base plate, 12 is a gin pole, and 23 is an assembly unit.

Claims (1)

[Scope of Claims] 1. At the center of the tower construction site, there is an upper plane large enough to fit inside the tower legs, and after supporting an assembly unit that also serves as a parts storage area and a workbench so that the upper plane is horizontal. A simple crane is installed in the assembly unit,
A method for constructing a steel tower, comprising assembling a climbing crane at the center of the tower construction site on the assembly unit using the simple crane, and further constructing the steel tower using the climbing crane. 2. A crane installation plane with a width that fits inside the tower legs is formed by a frame frame and a base plate, and the frame frame is supported by a required number of extendable and fixable legs extending perpendicularly and downward to the plane, and the crane installation A climbing crane device for constructing a steel tower, characterized in that a simple crane is provided at the periphery of the plane, and a climbing crane is provided at the center of the plane where the crane is installed.