JPH028107B2 - - Google Patents

Description

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

[Conventional technology]

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 7, 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, a climbing crane for assembling the tower is assembled and installed in place of the stationary crane for foundation work, and the crane is used for climbing. They were using two different types of cranes to assemble the steel tower. In Figure 7, a is a base for foundation work, b is a rotating frame, c is a guy support, d is a jib, and the height is h.
is about 5m.

[Problem that the invention seeks to solve]

However, the crane itself is a heavy object, and if the crane is to be transported by helicopter from flat ground to the mountain where the steel tower will be constructed, the crane must be disassembled and made many round-trip flights, increasing the number of times the crane must be transported by helicopter. At the same time, after the fixed crane for foundation work was removed, a climbing crane would have to be installed before the construction work could move on to assembling the steel tower.
It took a lot of time and effort to install and remove the crane.

Therefore, the present invention allows two types of cranes, a crane for foundation work and a crane for assembling steel towers, to be used in common by one crane, thereby enabling a smooth transition from foundation work to tower assembly work. The aim is to reduce the number of times the tower construction equipment and the helicopter used to transport the crane are transported, and to reduce the amount of equipment required by supporting the crane body.

[Means for solving problems]

The present invention has four additional masts arranged radially and removably attached to the swing seat of the crane main body, and an outrigger fitting is removably attached to the other end of each mast. are used as the legs of a crane mount for foundation work, and after the foundation work is completed, the masts used as the legs of the crane mount are successively added to allow the crane body to be used for tower assembly work.

[Effect]

When performing foundation work, a stand dedicated to foundation work is required, but this dedicated stand consists of a swing seat for the crane body, which is the center of the stand, and a mast that is used in conjunction with the tower assembly work. Since the climbing masts are used as legs, after the foundation work is completed, the masts used as legs are successively added to support the crane body during the tower assembly work. As a result, the same crane body can be used for foundation work for constructing a steel tower and for assembling a steel tower, and the number of equipment prepared for foundation work can be reduced.

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

1 to 6 show an embodiment of the present invention. In order to use the crane body 1 for both foundation work and tower assembly work, the crane body 1 is designed to be attachable to and detachable from a dedicated pedestal for foundation work. The mast that supports the crane body 1 during the steel tower assembly work is used as it is for the legs of the dedicated frame.

To be more specific, the crane main body 1 has a guy support 3, which is made up of a front column 3a and a rear column 3b, mounted on a swing frame 2 so as to be rotatable in the front-rear direction. or rear strut 3a or 3b (in the embodiment, the rear strut 3
Case b) is telescopic, and a jib 4 is attached to the front end of the revolving frame 2 so that it can be raised or lowered freely, and a luffing rope 6 wound around a luffing winch 5 installed on the revolving frame 2 is attached to the guy support 3. It is passed between the sheave at the top and the sheave at the tip of the jib 4 so that the jib 4 can be raised and lowered, and the hoisting rope 8 wound around the hoisting winch 7 on the revolving frame 2 is passed through the sheave at the tip of the jib. The hook 12 is hung so that the hook 12 can be hoisted up and down. The swivel frame 2 is connected to the swivel seat 10 via a swivel bearing 9.
The swivel frame 2 is configured to be able to swivel by a swivel device 11 placed on the top of the swivel frame 2, and the swivel seat 10 has a bracket 13 on the side wall that protrudes in four directions: front, rear, left, and right. At the same time, a bracket 14 is provided on the bottom surface of the bracket 14 to protrude downward.

When the crane main body 1 is used for foundation work for constructing a steel tower, a dedicated mount is required in order to lower the overall height and work stably. In order to support the crane body 1 climbing during construction, the additional masts 15 for adding multiple stages are used as they are, and the four masts 15 are used as the legs of the frame, and each end is attached to the bracket 13 of the swing seat 10. Outrigger metal fittings 16 having outriggers 17 that can be raised and lowered are detachably attached to the tips of each legs, and the outriggers 17 hold the pedestal horizontally so that foundation work can be performed.

When performing foundation work, it is necessary to support the crane body 1 on a pedestal using a mast 15 as shown in Figure 1, and to keep the height of the crane as low as possible from the standpoint of safety against helicopters during the foundation work. Because of this, Guy Support 3 is available as needed.
By shortening the rear strut 3b, the guy support 3 is tilted backward to further reduce the height.

In the above state, the jib 4 is raised and lowered to transport the equipment suspended by the hook 12, and the equipment is transported to the construction site on the tower foot by lifting and lowering the hook 12.
The equipment carried in is assembled, concrete 19 is poured into the excavated hole 18, etc., and the tower legs 20 are fixed.

After a series of foundation work is completed, a platform 21 is placed below the crane body 1 on which to place a guide mast 22 for climbing used in the tower assembly work and an additional mast 15 to support the crane body 1 in the tower assembly work. The ground is leveled and laid horizontally as shown in FIG.
A guide mast 22 is positioned between masts 15 as legs and stands on a stand 21. At the same time, a rope 25 wound around the winch 24 attached to the guide mast 22 is passed between the sheave 26 at the top of the guide mast 22 and the lifting frame 23 to suspend the lifting frame 23. Although not shown, the elevating frame 23 has a hole in the center through which the mast 15 can pass, a guide wheel on the outside, and a guide rail (not shown) provided on the inner surface of the guide mast 22. It is designed so that it can be raised and lowered along.

When the elevating frame 23 is suspended by the rope 25, the additional mast 15 used as a pedestal for foundation work is attached to the swivel seat 1 of the crane body 1.
0 from the bracket 13, and each mast 1
5. Remove the outrigger fitting 16 at the tip from the mast 15. At the same time, the winch 24 is driven to raise the elevating frame 23 and lift the crane main body 1 as it is. The lifting frame 23 is added to the mast 15
When the mast 15 is raised by the length of , the mast 15 used as the pedestal leg in the foundation work is erected on the platform 21 to be used as a mast for supporting the crane (see FIG. 4). From the state shown in FIG. 4, once lower the elevating frame 23 and
is placed on the mast 15, and the upper end of the mast 15 is connected to the bracket 14 on the lower surface of the swivel seat 10. After that, lower the elevating frame 23 to the lowest position,
The lifting frame 23 and the lower end of the mast 15 are locked with a locking device such as a bolt (not shown), and the lifting frame 23 is raised again by the same stroke as described above to raise the second stage mast 15 (see FIG. 5). When the lower end of the upper mast 15 and the upper end of the lower mast 15 are connected, the elevating mast 23 is lowered, and the crane body 1 is climbed while adding masts 15 in the same manner as described above, as shown in FIG. As shown, the climbing will be done in accordance with the progress of the steel tower assembly work.

When the tower assembly work is completed and the crane is to be removed, the crane body 1 is lowered by the reverse operation of the climbing operation described above, and finally the guide mast 22 is removed.
be disassembled and removed.

Note that the present invention is not limited to the above-mentioned embodiments, and the front support 3a of the guy support 3 may be telescopic, and the elevating mechanism of the elevating frame 23 may be a cylinder device instead of a winch. However, various other changes may be made without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, when constructing a steel tower in the mountains, a large number of masts are used when assembling the tower by climbing a crane.
Since it can be used as it is as the legs of the mount used for foundation work, it is possible to construct a steel tower with one crane body by simply preparing the mast connection part and outrigger metal fittings on the crane body, without having to prepare a separate mount exclusively for foundation work. It can be used for foundation work and tower assembly work, and it is economical because only the outrigger metal fittings are required for foundation work, and the number of times the helicopter used to transport equipment and cranes for mountain tower construction is reduced ( This has the excellent effect of significantly reducing the time required (during installation and removal).

[Brief explanation of drawings]

Figure 1 is a side view showing the state in which the crane of the present invention is performing foundation work, Figure 2 is a - arrow view of Figure 1, and Figures 3 to 6 are states in which foundation work has transitioned to tower assembly work. FIG. 7 is a side view of a conventional foundation construction stationary crane. 1 is a crane main body, 2 is a swing frame, 4 is a jib, 10 is a swing seat, 15 is an additional mast, 16 is an outrigger fitting, 22 is a guide mast, 23 is a lifting frame, and 24 is a winch.

Claims (1)

[Scope of Claims] 1. A crane body comprising a jib that can be raised and lowered freely and a revolving frame that is rotatably supported on a revolving seat is supported on a frame that uses the mast that is used in many cases when assembling a steel tower as a leg. The foundation work for construction was carried out, and after the foundation work was completed, the guide mast was erected to support the crane body while climbing, and the masts used as the pedestal legs were added, and the crane body was used for the tower assembly work. A steel tower construction method characterized by performing steel tower assembly work. 2. A connecting part for connecting and holding one end of a mast used as a pedestal leg is provided on the swing seat of the crane body, which has a swing frame mounted on the swing seat so as to be freely swingable and a jib that can be raised and lowered on the swing frame. , and in order to use the mast as a pedestal leg, it has an outrigger metal fitting to be detachably attached to the other end of the mast, and furthermore, after the foundation work is completed, the mast as the pedestal leg is successively added to allow the crane body to climb. A climbing crane used in a steel tower construction method, characterized in that a guide mast and a lifting frame can be assembled and disassembled.