JPS6228078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting a mast in a bottom-addition type climbing crane that connects a bottom-additional mast to the bottom of the lowest mast.

Next, an example of a conventional climbing crane for constructing steel towers will be explained with reference to FIGS. 1 to 6.

The lower end of a crane mast (hereinafter referred to as "mast") 10 is installed on the gantry (base) 5, and left and right base masts (masts for supporting lifting equipment) 9 are installed. It is supported by a horizontal ground branch line 4 and a diagonal ground branch line 3 stretched between the upper part of the pace mast 9 and the steel tower main column 1, respectively. The middle portion of the mast 10 is supported by a mast guide 2 supported by branch lines at vertical intervals in the center of the steel tower. As shown in FIG. 2, a plurality of mast guides 2 are attached to the mast 10 to be supported by the steel tower as the tower is constructed.

A climbing rope 8 extended from a climbing winch 7 installed on a pedestal 5 is connected to a lifting frame 6 that is raised and lowered relative to the left and right base masts 9. As shown in FIG. 6, the middle of the climbing rope 8 is wrapped around a sheave group 24A installed on the upper frame of the base mast 9 and a sheave group 24B installed on the lifting frame 6, and the end part is connected to the base mast 9. It is fixed to the upper frame of 9.

As shown in FIG. 2, the upper part of the mast 10 includes a lower frame 11, a middle frame 12, and an upper frame 13.
A hoisting winch 14 and an elevating winch 15 are installed on the upper frame 13, and an A frame 16 is fixed.
The jib 17 is attached so that it can be raised and lowered.
Hoisting rope 1 let out from hoisting winch 14
9 is suspended from the sheave at the tip of the jib 17,
A hook 18 is attached to its end. Elevation rope 20 extended from elevation winch 15
is connected to the tip of the jib 17.

As the construction of the steel tower progresses, the crane will be climbed in the following manner. First, jib 17
Raise the person to an upright position and assume a climbing position. Next, the lifting frame 6 and the mast 10 are connected to each other by a bolt pin 22 (see FIG. 4), and the climbing winch 7 is operated in the hoisting direction to raise the mast 10 as shown in FIG. 3. Thereafter, the supplementary mast 10A, which has been previously installed on the carrier (truck) 21, is moved and placed directly below the raised mast 10. Then, the climbing winch 7 is rotated in the lowering direction to lower the elevating frame 6, and the upper end of the replenishing mast 10A is connected to the lower end of the mast 10 by the connecting pin 23. That is, the square hole 1 at the lower end of the mast 10
A fitting protrusion at the upper end of the additional mast 10A is fitted into the fitting part 0a, and both fitting parts are connected by a connecting pin 23. In this state, the elevating frame 6 is slightly raised, the carrier 21 is added and removed from the lower end of the mast 10A, and returned to its original position. Then, remove the bolt pin 22, lower the elevating frame 6,
This is installed on the pedestal 5. The climbing work is now complete.

Generally speaking, a single mast for a climbing crane of about 50 t.m weighs about 1 t to 1.5 t, and putting it on a carrier and pushing it to the connecting position is quite hard work. Requires human labor. In addition, the mast connecting pin must be attached and detached at a high place. and,
A carrier must be equipped to withstand the weight of the mast, which increases cost and transportation costs. Incidentally, climbing cranes for constructing steel towers are often operated in mountainous areas, and their parts are mainly transported by cableway or helicopter, so transportation costs account for a large proportion of the total construction cost. Furthermore, when placing the supplementary mast on the carrier, it is necessary to set the mast in an upright position and sling the top of the mast. Therefore, work efficiency and safety are poor.

An object of the present invention is to provide a method for easily and safely connecting additional masts.

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 7 to 12. In these figures, the same reference numerals as in FIGS. 1 to 6 represent the same or equivalent items.

As shown in Fig. 10, the addition mast 10A
A link-shaped connecting insertion protrusion 25 with a pin hole 25a is attached to the upper end of the mast 10 by two fixing pins 26, and the lower end of the mast 10 has a
A half-split insertion hole (square hole) 27 is formed into which the coupling insertion protrusion 25 is inserted, and a pin hole 27b that matches the pin hole 25a is provided in the side wall portion where the half-split groove 27a is not provided. It is being The connecting protrusion 25 can be inserted into the half-split groove 27a both from directly below and from the side.

The addition of the addition mast 10A is performed as follows.

(a) Suspend the supplementary mast 10A with the hook 18 of the climbing crane or the hook of another crane, position the connecting insertion protrusion 25 beside the mast 10, and install it horizontally on the pedestal 5.

(b) The mast 10, which has been raised in advance for connection work, is lowered via the lifting frame 6, and the connection insertion protrusion 25 is located on the upper side.
into the half-split groove 27a of the mast 10,
Connecting pins 28 are inserted into pin holes 27b and 25a to connect both parts to each other (see FIG. 8).

(c) After raising the replenishment mast 10A to a nearly vertical state by pulling up the elevating frame 6, the mast 10 and the replenishment mast 10A are connected by pushing slightly with human power.

(d) Connecting pins 28 are inserted into the other pin holes 27b and 25a in which the connecting pins 28 are not inserted, and the two parts are connected to each other. Insert a split pin 29 into each pin hole 28a provided in the connecting pin 28.
to prevent each connecting pin 28 from coming off. Figures 11 and 12 show additional mast 1
0A is shown completely connected to the mast 10 by the connecting pin 28.

The above is the order of mast connection operations, but when dismantling the crane, the operation of pulling out the mast can be performed in the reverse order.

According to the invention described above, the following effects can be obtained.

(1) Labor can be saved because there is no need to push the additional mast to the connecting position while it is on the carrier. Moreover, since a carrier is not required, manufacturing costs and transportation costs can be reduced.

(2) The work of attaching and detaching connecting pins at high places can be done in half the time compared to conventional methods, improving work efficiency and safety.

(3) Slinging work on the additional mast can be carried out with the additional mast lying on its side.
It can improve work efficiency and safety.

[Brief explanation of the drawing]

Figure 1 is a front view showing a steel tower assembled with a conventional climbing crane for building steel towers, Figure 2 is a front view showing a climbing crane, and Figure 3 is a
Enlarged front view showing the lifting device part in the figure, No. 4
The figure is a side view of Figure 3, Figure 5 is a perspective view showing the connection between the lower end of the conventional mast and the upper end of the additional mast, and Figure 6 shows how to hang the rope of the lifting device in Figure 2. Fig. 7 is a front view showing a state in which the replenishing mast according to the present invention is laid down sideways and connected to the connecting part on one side of the mast with a connecting pin, and Fig. 8 is a view taken from the - line in Fig. 7. 9 is a side view showing the state in which the additional mast is lifted diagonally upward from the state shown in FIG. 8 through the lifting frame. FIG. 10 is a side view showing the lower end of the mast according to the present invention and the upper end of the additional mast according to the present invention. FIG. 11 is a perspective view showing a connecting portion with a connecting portion, a connecting pin that connects the connecting portion, and a cotter pin attached to the connecting pin; FIG. 12 is a side view taken along line XII-XII in FIG. 11. 1... Steel tower main column, 3... Diagonal ground branch line, 4... Horizontal ground branch line, 5... Frame, 6... Lifting frame, 7...
... Climbing winch, 8 ... Climbing rope, 9 ... Base mast, 10 ... Crane mast, 10A ... Additional mast, 14 ... Hoisting winch, 15 ... Elevation winch, 16 ... A frame, 17 ... Jib, 19...Hoisting rope, 2
0...Elevation rope, 21...Carrier, 24A,
24B... Sheave group, 25... Connection insertion protrusion, 25a... Pin hole, 26... Fixing pin, 27
...Half-crack insertion hole, 27a...Half-crack groove, 2
7b...Pin hole, 28...Connecting pin, 29...
Split pin.

Claims (1)

[Scope of Claims] 1. A method for connecting a mast in a bottom-jointed climbing crane, which includes the following steps (a) to (d). (a) The process of hoisting a supplementary mast with a connection insertion protrusion at the end of the connection side using a crane, positioning the connection insertion protrusion on the side of the crane mast, and installing it horizontally on a pedestal; (b) ) A half-break insertion hole into which the connection insertion protrusion of the supplementary mast is inserted is formed at the lower end, and a connection pin hole is provided in the wall where the half-break groove of the half-break insertion hole is not provided. (c) lowering the mast via the lifting frame, inserting the connecting insertion protrusion located on the upper side into the insertion hole through the half-split groove, and connecting both parts to each other with the connecting pin; (d) Insert the uninserted coupling insertion protrusions into the opposing insertion holes, and pin both parts together. The process of connecting each other,