JPS6323118B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stay rope changing method and apparatus for, for example, assembling a crane jib in the air.

When attaching the jib to the crane body in locations where it is not possible to pre-assemble the jib on the ground and attach it to the crane revolving body, such as in mountainous areas,
The idea is to use a cable crane to transport the jib and attach it to the crane body.

However, once assembled, the jib is so heavy that it cannot be transported by a regular cable crane. For this reason, a method can be considered in which the jib is made into a block heavy enough to be transported by a cable crane, and the blocks are transported in blocks and assembled in the air.

According to this method, the blocks of the jib are connected in the air, but when several blocks are connected, the strength of the joint part alone cannot support it, so it is necessary to tension the stay ropes and support them with the stay ropes. be. In this case, as the additional length of the block increases, the stay ropes must be tightened one after another, so it is necessary to replace the stay ropes.

The present invention was made for the purpose of easily, quickly, and reliably changing the stay ropes, and the auxiliary rope is hung between the stay rope that has already been stretched and the main body side, and the auxiliary rope is A vertical force is applied to the stay rope through the auxiliary rope to bend it, pull up a supported object such as a jib, add a connecting block, tension the next stage of the stay rope on the connecting block, and bend the stay rope. The gist of this method is to remove the existing stay rope after removing the vertical force and supporting the object to be supported by the stay rope of the next stage so as to make the existing stay rope slack. Examples will be described with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of the device of the present invention,
Figures 2, 3, and 4 are parts A and B of Figure 1,
It is an enlarged view of part C.

A total of four eye plates 3 are fixed to the left and right sides of the upper end surface of the top frame 2 of the revolving body 1, two each, and a hole is bored in the top of the eye plate 3 to which a connecting pin 13, which will be described later, can be attached and detached. A guide roller 5 is pivotally supported on each eye plate 3 via a bracket 4 on the center side of the rotating body. A link joint 12 is attached to the top frame side end of the stay rope 6, which is formed by sequentially pivoting a connecting plate 9, a triangular intermediate link 10, and a connecting plate 11.
The joint 12 can be attached to and detached from the eye plate 3 via a connecting pin 13. On the other hand, a connecting plate 14 is pivotally attached to the jib side end of the stay rope 6, and can be connected to and released from an eye bracket 16 fixed to the tip of the jib block via a connecting pin 15. Here, eye brackets 16 are provided on both left and right sides facing the eye plate 3. Further, eyepieces 17 are provided protruding from both the right and left sides of the revolving body 1, and an auxiliary rope 19 is connected to the eyepiece 17 via a chain block 18, and the stay rope 6 can be releasably held at the tip of the auxiliary rope 19. Attach the connecting fitting 20. A small winch (not shown) is installed at a predetermined position on the revolving body 1, and a rope 21 from the winch is wound around the guide roller 5 so that it can be detachably connected to the top of the intermediate link 10.

The procedure for changing the stay rope in the above configuration will be explained with reference to FIGS. 5 to 10.

First, the jib block 22 on the base side is lifted by a cable crane and attached to the revolving structure 1 so that it can rise and fall freely. Rope 21 from a small winch (not shown)
is connected to the intermediate link 10 of the link joint 12, and the tip of the stay rope 6 is connected to the tip of the jib block 22 while the stay rope 6 is connected to a small winch. The ends of the stay ropes 6 are connected by overlapping the connecting plate 14 with the eye bracket 16 and passing the connecting pin 15 through both. Next, use a small winch to wind the rope 21 into the connecting plate 11 of the link joint 12.
The stay rope 6 is overlapped with one of the individual eye plates 3, passed through both with a connecting pin 13, and the base end of the stay rope 6 is engaged with the top frame 2 (see FIG. 5). When winding the rope 21 with this small winch, the tension action line of the stay rope 6 and the rope 21
A moment is generated because the line of tension action on both ropes 6 and 21 is misaligned, but since the link joint 12 is a three-bar link, each joint rotates so that the line of tension action on both ropes 6 and 21 coincides. Since the connecting position of the eye plate 21 is the intermediate link 10, the joint at the tip, that is, the connecting plate 11 is in a free state, and the connecting operation between the connecting plate 11 and the eye plate 3 is extremely easy.

The suspended state of the cable crane is released, and the auxiliary rope 19 is connected to the middle part of the stay rope 6 via the connecting fitting 20. Stay rope 6
The jib 26 is then supported, and the intermediate jib block 23 is fixed using a cable crane.

The chain block 18 interposed between the auxiliary rope 19 and the revolving structure 1 applies a vertical force to the stay rope 6 via the auxiliary rope 19, bends the stay rope 6, pulls up the jib 26, and lifts the eye of the intermediate jib block 23. The distance between the bracket 16 and the eye plate 3 of the top frame 2 is made shorter than the length of the second stay rope 7. In this state, the tip of the second stay rope 7, which is connected to a small winch in the same way as the stay rope 6, is connected to the eye bracket 16 via the connecting plate 14 (FIG. 6). Next, a small winch is used to wind the rope 21 and the base end of the second stay rope 7 is connected to the other of the two eye plates 3 through the link joint 12, and the chain block 18 is used to loosen the auxiliary rope 19. Here, if the length of the stay rope 6 is set so that when the second stay rope 7 supports the jib 26, as shown in FIG. It can be removed and can be rolled up with a small winch. Next, in the same procedure, the second stay rope 7 is bent via the auxiliary rope 19 to raise the jib 26, and the third stay rope 8 is stretched between the joined intermediate jib 24 and the top frame 2. (8th
), by supporting the jib 26 with the third stay rope 8 and adding the tip jib block 25, the jib 26
6 assembly is completed. In this case as well, the length relationship between the second stay rope 7 and the third stay rope 8 is determined as follows: when the jib 26 is supported by the third stay rope 8,
If the stay rope 7 is left slack, it is extremely easy to remove the second stay rope 7 (9th stay rope 7).
Figure 10).

Incidentally, in the above embodiment, the tension of the auxiliary rope is generated by a chain block, but it goes without saying that the tension may be generated by a winch already provided on the climbing crane. Furthermore, it goes without saying that the present invention can also be applied to structures where stay ropes are replaced, such as bridges.

As described above, the present invention has an extremely simple structure that only requires providing a means capable of applying vertical force to the stay rope, and allows the stay rope to be changed easily and quickly. It has the excellent effect of being reliable.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the device of the present invention, Fig. 2 is an enlarged view of section A in Fig. 1, Fig. 3 is an enlarged view of section B in Fig. 1, and Fig. 4 is an enlarged view of section C in Fig. 1. The enlarged views and FIGS. 5 to 10 are diagrams showing the stay rope replacement procedure. 1 is a revolving body, 2 is a top frame, 6, 7, 8 are stay ropes, 18 is a chain block, 19 is an auxiliary rope, and 26 is a jib.

Claims (1)

[Scope of Claims] 1. An auxiliary rope is hung between the stay rope that has already been stretched and the main body side, and a vertical force is applied to the stay rope through the auxiliary rope to bend the stay rope,
The object to be supported, such as a jib, is raised, a connecting block is added, the next stage stay rope is stretched on the connecting block, the vertical force from the auxiliary rope is removed, and the object to be supported is raised by the stay rope of the next stage. After supporting the existing stay rope so as to make it slack,
A stay rope replacement method characterized by removing an existing stay rope. 2 It is equipped with a plurality of stay ropes that are strung between the tip of each block of the supported object such as a jib and the required position on the main body side that supports the supported object, which are assembled by appropriately sized blocks, and the length of each rope is as follows. When the object to be supported is supported by the stay ropes of each stage, the stay ropes of the previous stage are made to slacken, and an auxiliary rope that can be disconnected from each stay rope is hung between the stay rope midway position and the main body, and the auxiliary ropes are A stay rope changing device characterized by being provided with a tension generating device such as a chain block that bends the stay rope by applying a vertical force to the stay rope.