JPH028106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction method for performing foundation work to tower assembly work when constructing power transmission towers, etc. in mountains, etc., and a climbing crane used in the construction method.

[Prior Art] When constructing power transmission towers, antenna towers, etc. in mountains, the equipment necessary for constructing the towers is transported by helicopter.

Foundation work for steel tower construction involves excavating the ground and pouring concrete to plant the tower legs. However, in the case of tall steel towers, the fixed positions of the pillars are widely spaced, so cranes are required to construct the tower. is used.

However, when constructing a steel tower using a crane, a large amount of equipment is transported and unloaded from the ground by helicopter during the foundation work. The maximum height is around 6m, so it is necessary to keep the height as low as possible.

For this reason, conventionally, foundation work uses a lower-height stationary crane for foundation work, as shown in Figure 9, and tower assembly uses a taller climbing crane for tower assembly, so two types of cranes are used. During foundation work, a stationary crane is assembled and installed at the tower construction site, and once the foundation work is completed, the climbing crane for assembling the tower is replaced with a stationary crane for foundation work, assembled and installed.
Two types of cranes were used to assemble the tower while climbing. In Figure 9, a is a base for foundation work, b is a rotating frame, and c
is the guy support, d is the jib, and the height h is 5m
There is a rank.

[Problems to be solved by the invention] However, the crane itself is a heavy object, and if the crane is to be transported by helicopter from the flat ground to the mountain where the steel tower will be constructed, the crane must be disassembled and made many round-trip flights. This meant that the number of helicopter transports would increase, and the construction work could not proceed to the tower assembly unless a climbing crane was installed after the fixed crane for foundation work was removed.
It took a lot of time and effort to install and remove the crane.

Therefore, the present invention solves the above-mentioned conventional problems by allowing two types of cranes, one for foundation work and one for assembling steel towers, to be used in common by one crane, thereby allowing a smooth transition from foundation work to tower assembly work. That is.

[Means for Solving the Problems] The present invention provides a special mount for foundation work that is detachably supported by the crane body, and is used as a crane for foundation work by being attached to the dedicated mount during foundation work. After completion of the above, the dedicated trestle was removed and a guide mast for climbing was installed.
The crane is made to climb along the guide mast and the steel tower is assembled upward.

[Operation] When performing foundation work, use the dedicated trestle as legs and lower the height of the crane. Once the legs of the steel tower have been reclaimed and the foundation work is completed, the special pedestal is removed and the guide mast is erected.
A crane is used to climb the mast, the mast is added, and the steel tower aggregate is attached to the legs of the steel tower, and the tower is assembled.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 8 show an embodiment of the present invention, in which a crane main body 1 has a guide support 3 erected on a revolving frame 2, with a front strut 3a and a rear strut 3b formed in an A-shape. At the same time, a jib 4 is attached to the front end so that the jib 4 can be raised and lowered freely, and a hoisting rope 6 wound around a hoisting winch 5 installed on the revolving frame 2 is passed between the jib at the third section of the guide support and the jib at the tip of the jib 4 to create a jib. 4 can be raised and lowered, and a hoisting winch 7 on the revolving frame 2
A hook 9 is hung via a jib at the tip of the jib by a hoisting rope 8 wound around the hoist, so that the hook 9 can be hoisted up and down. The swing frame 2 is placed on a swing seat 11 via a swing bearing 10, and is configured to be able to swing by a swing device 12 installed on the swing frame 2.

When the crane main body 1 is used for foundation work for constructing a steel tower, in order to reduce the overall height and enable stable work, the crane body 1 has legs 14 that extend horizontally in all directions as shown in Figs. 1 to 4. The legs 14 are placed on a pedestal 13 dedicated to foundation work that can be separated, and the legs 14 are separated according to the slope of the ground at the construction site.
The height of the outrigger 15 at the tip is adjusted to hold the dedicated frame 13 horizontally. Reference numeral 16 denotes an elevating frame for climbing the crane main body 1 when used for steel tower assembly work, and is placed on a dedicated pedestal 13 in advance. Reference numeral 17 designates a platform on which a guide mast 18 for climbing used in the steel tower assembly work and a mast 19 of a crane used in the steel tower assembly work are mounted, and the ground of the foundation is leveled and installed horizontally.

When performing foundation work, set jib 4 in the condition shown in Figure 1.
Due to the ups and downs of the building, the machines are transported suspended by hooks 9, and the machines are continuously carried into the tower foundation construction department by lifting and lowering hooks 9, and the machines carried in are assembled, concrete 21 is poured, etc. Then, the steel tower legs 20 are reclaimed.

When a series of foundation works are completed, the guide mast 18 is erected between the legs 14 of the dedicated frame 13, as shown in FIGS. 2 and 3. This guide mast 18 is the stand 17
Fix it on top. At the same time, the rope 23 wound around the winch 22 attached to the guide mast 18 is connected to the jive 24 at the top of the guide mast 18 and the lifting frame 1.
6 and hang the elevating frame 16.
The elevating frame 16 has guide wheels 25 (see FIG. 8) on the outside so that it can be moved up and down along a guide rail provided or formed on the inner surface of the guide mast 18. A hollow hole 26 large enough to pass through the mast 19
(See FIG. 8), and a cannula is provided at an appropriate location on the inner edge of the hole 26 so that it can be moved in and out in the horizontal direction.

When the elevating frame 16 is suspended by the rope 23, the legs of the dedicated pedestal 13 for foundation work are divided at the dividing part 14a, the dedicated pedestal 13 is dismantled and removed, and the winch 22 is driven. The lifting frame 16 is raised and the crane main body 1 is lifted as it is (see Fig. 4). The lifting distance of the elevating frame 16 is the length of the addition mast 19 to be added. The crane body 1 is added to the mast 19
When it is lifted by the length of
After connecting the upper end and the swivel seat 11, lower the elevating frame 16, connect it with a cannula, and install the mast 19.
The lifting frame 16 is again raised by the length of the addition mast 19 to be added next by engaging the upper end portion. The elevating and lowering frame 16 is guided by the guide mast 18 via the guide wheels 25, so that the elevating frame 16 is smoothly moved without shaking.

When the crane main body 1 is lifted together with the replenishing mast 19, the second stage replenishing mast 19 is erected on the stand 17 and connected to the lower end of the first stage replenishing mast 19 to perform replenishment.

In this way, the supporting masts of the crane main body 1 are sequentially added to allow the crane main body 1 to climb, and the steel tower is assembled by assembling the steel tower aggregates to the steel tower legs 20 for which the foundation work has been completed. As the tower assembly work progresses, the crane body 1 is climbed and support masts are added sequentially as shown in Figures 6 to 8, and machines are hoisted from the machine storage area and assembled, and the tower is assembled. Have assembly work done.

When the tower assembly work is finished and the crane is to be removed, the crane body 1 is lowered by performing the operation opposite to the climbing operation described above. That is, the lifting frame 1
6, while supporting the mast 19 and the crane body 1, remove them from the lower additional mast in order. When the crane body 1 descends between the guide masts 18, the jib 4 is erected to the minimum radius. shall be. When the crane body 1 is lowered, it is disassembled and the guide mast 18 is also disassembled and removed.
Note that the present invention is not limited to the above-mentioned embodiment, and the elevating mechanism for the elevating frame 16 is the eighth embodiment.
Although the case using the winch 22 and rope 23 shown in the left half of the figure is shown, it is also possible to adopt a cylinder device 27 as shown in the right half of FIG. Of course, it is also possible to add

[Effects of the Invention] As described above, according to the present invention, a crane for foundation work necessary for constructing a steel tower in the mountains and a crane for assembling a steel tower, which is work at heights, are used during foundation work. The dedicated mount can be disassembled and removed so that it can be used in common, and one crane can be easily transferred from foundation work to tower assembly work, eliminating the need to use two different types of cranes. In addition to being able to reduce labor for removal and assembly, the crane body can be shared by simply preparing a special frame for foundation work, increasing economic efficiency, and significantly reducing the effort and time required for installation and removal. Furthermore, it can bring about excellent effects such as reducing the number of times equipment is transported by helicopter.

[Brief explanation of drawings]

Figures 1 to 8 all show examples of the present invention, with Figure 1 being a side view of the crane during foundation work, and Figure 2 showing the crane when the foundation work is completed and the tower assembly work begins. FIG. 3 is a side view showing the condition of FIG. 2, FIG. 4, FIG. 5, FIG. 6, and FIG. , FIG. 8 is a diagram showing an example of a climbing mechanism, and FIG. 9 is a side view of a conventional stationary crane for foundation work. 1 is the crane body, 2 is the revolving frame, 4 is the jib, 13 is the dedicated mount, 16 is the lifting frame, 18
19 indicates a guide mast, and 19 indicates an additional mast.

Claims (1)

[Scope of Claims] 1. Foundation work is carried out by supporting the crane body on a dedicated pedestal that can be disassembled, and after the foundation work is completed, a guide mast is erected to support the crane body, and then the dedicated pedestal is disassembled and removed; After that, the steel tower construction method is characterized in that the tower assembly work is performed while climbing the crane body. 2. The crane body, which is equipped with a jib that can be raised and lowered on a revolving frame, can be placed on a disassembleable platform dedicated to foundation work, and the crane body can be placed on it, and the additional mast can be penetrated. A climbing crane for use in a steel tower construction method, characterized in that a guide mast is provided with an elevating frame that can be raised and lowered freely, and an engagement device that is attached to the elevating frame and that engages with the mast is removably provided.