JPS6332717B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a climbing crane.

Conventionally, as a method of increasing the freestanding height of a climbing crane, there is a method of using an inner mast and an outer mast in combination. As shown in Fig. 1, this method first lifts the inner mast 1 using the jib 3 of the revolving structure 2, and positions the lifted inner mast 1 at a radius of around 0 m, that is, at the center of the existing inner mast 1 on the pedestal 4. Then, it is placed on the existing inner mast 1 from the top of the revolving frame 5 and assembled. After assembly, the revolving body 2 is raised by the lifting device 6 equipped on the inner mast 1, and the next inner mast 1 is moved again. After loading and assembling, the revolving body 2 is further raised, and the above steps are repeated as appropriate to complete the inner mast 1 to a predetermined height, and then as shown in FIG.
The outer mast 7 is sequentially assembled to the outer periphery of the inner mast 1 from below to a predetermined height, and then as shown in FIG.
By attaching the inner mast stay 8 to the required height position from the outer mast 7, the inner mast 1 is supported,
The inner mast 1 was taken in again, assembled, and raised to secure the required height.

However, in such a conventional method, (i) it is necessary to secure a working radius of 0 m (or around 0 m), which is unnecessary in normal work, in order to take in the inner mast; Therefore, the length of the jib 3 becomes longer and the rear turning radius becomes larger.

(ii) Since the inner mast 1 passes through the inside of the revolving body 2, the revolving frame 5 and the revolving ring 9 become larger.

(iii) Workability is poor because the inner mast is assembled in a narrow space.

(iv) Since the outer mast 7 is assembled sequentially from the bottom, work is required at high places, which poses problems in workability and safety, and requires skilled workers for assembly.

(v) There is a "double" part between the outer mast 7 and the inner mast 1, which is uneconomical.

It had the following problems.

In view of these circumstances, the present invention provides a lifting device between the upper end of the outer mast and the inner mast, and takes in and assembles the inner and outer masts near the ground, thereby increasing workability and safety. The present invention is intended to provide a climbing crane that can reduce the size, weight, and cost of the revolving frame, revolving ring, etc.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, an anchor mast 11 for the inner mast is attached to the foundation 10 at the location where the crane is installed.
The anchor masts 12 for the outer masts are buried so as to surround the anchor masts 11 for the inner masts so that their upper ends protrude above the ground by a required amount, and the first stage outer mast is placed on the anchor masts 12 for the outer masts. 7 is removably attached, an inner mast 1 for supporting the revolving body 2 is disposed on the upper part of the outer mast 7, and a lifting device 13 is provided between the inner mast 1 and the upper end of the outer mast 7.

As shown in FIG.
A guide mast 14 attached to the upper end of b, a support frame 15 fixed to the guide mast 14, and an elevating frame 1 disposed above the support frame 15.
6, a lowering cylinder 17 installed between the frames 15 and 16, and a bolt 18 provided at the rod end of each frame 15 so that it can be inserted into and removed from a lock hole 19 bored in the outer wall of the inner mast 1. , 16, and an eccentric roller 21 attached to each frame 15, 16 to prevent the inner mast 1 from rolling.

Further, on the foundation 10 inside the first stage outer mast 7, a guide rail 22 is laid from the side of the outer mast 7 to both sides of the anchor mast 11 for the inner mast, and the guide rail 22 is laid on the foundation 10 inside the outer mast 7 of the first stage. A trolley 23 for transporting the inner and outer masts 1 and 7 and a telescopic pedestal 26 to be described later can be moved. This loading cart 23
has a U-shape in plan, and as shown in FIG. 6, the attachment 24 for carrying in the additional inner mast 1 and the telescopic pedestal 26 can be attached and detached inside it.
Further, as shown in FIG. 7, attachments 25 for carrying in an additional outer mast 7 can be attached to and detached from the four outer corners of the mast.

Furthermore, after the outer mast 7 and the inner mast 1 are assembled (details will be described later), an extendable frame 26 is provided for transmitting the loads of the inner mast 1 and the rotating structure 2 to the outer mast 7 side. This telescopic frame 26 is shown in FIGS. 8 to 10.
As shown in the figure, a base part 27 that can be connected to the lower end of the lowermost inner mast 1, legs 28 that extend and contract in a radial direction toward the main body 7a at the four corners of the outer mast 7 from the base part 27 by the operation of a cylinder 29, A positioning part 30 provided in the middle of the leg 28, and a presser metal fitting 31 for fixing the tip of the leg 28 to the support 7a of the outer mast 7.
It has a configuration consisting of.

Note that in FIGS. 4 to 10, the same reference numerals as in FIGS. 1 to 3 indicate the same parts.

Next, the lifting and lowering process of the crane of the present invention will be explained in detail with reference to FIGS. 11 to 17.

First, as shown in FIG. 6, an additional inner mast 1 is mounted on the trolley 23 with the inner mast attachment 24 attached to its inner side by operating the revolving structure 2, and the inner mast 1 After confirming whether it can be inserted into the first stage outer mast 7, the trolley 23 is pushed under the existing inner mast 1 using human power or a winch (see FIG. 11). Note that the reinforcing material 7b of the outer mast 7 at the portion intersecting with the additional inner mast 1 is removed in advance.

Next, the existing inner mast 1 that supports the revolving structure 2 is lowered by operating the lifting device 13, and a very small gap is created between the upper end of the additional inner mast 1 and the lower end of the existing inner mast 1, and the two are bolted together. Temporarily fasten while maintaining a very small gap. After the temporary fixing, the inner mast 1 is slightly raised and the trolley 23 is pulled out, and then the inner mast 1 is lowered and the temporary fixing parts are permanently fixed without any gaps (see FIG. 12).

By repeating the above operations, the inner mast 1 is raised one by one to ensure a predetermined height (normally, the inner mast 1 is assembled to its self-sustaining limit). After the assembly of the inner mast 1 is completed, the engagement between the lower end of the first stage outer mast 7 and the upper end of the outer mast anchor mast 12 is released (see FIG. 13).

Thereafter, the first stage outer mast 7 is raised to a predetermined position by operating the lifting device 13 with the inner mast 1 as the center (support structure). Subsequently, as shown in FIG. 7, the additional outer mast 7 is mounted on the trolley 23 to which the inner mast attachment 24 has been removed and the outer mast attachment 25 has been attached, and the trolley 23 is positioned on the upper stage. It is carried under the outer mast 7. The additional outer mast 7 carried in is fixed to the upper outer mast 7 in the same way as the inner mast 1, and the reinforcing member 7b in the carrying direction part is attached (see FIG. 14).

Furthermore, repeat the above operation to raise the outer mast 7 one after another and assemble it to a predetermined height. After assembly, the lower end of the lowest outer mast 7 and the anchor mast 1 for the outer mast
The outer mast is completed by engaging and fixing the upper end of the outer mast (see Fig. 15).

After the outer mast 7 is completed, the engagement between the lower end of the lowermost inner mast 1 and the upper end of the inner mast anchor mast 11 is released, the inner mast 1 is slightly raised, and the legs are attached to the lower part of the inner mast 1 by the trolley 23. The telescopic pedestal 26 with the 28 retracted is carried in, and the base part 2 of the pedestal 26 is
7 and the lower end of the inner mast 1 are connected with bolts or the like (see FIG. 16).

Then, the cart 23 is pulled out and the inner mast 1 is raised to a predetermined height position using the outer mast 7 as a supporting structure. At this time, the legs 28 of the pedestal 26 do not come into contact with the outer mast 7, as shown in FIG. At this raised position, the eccentric roller 21 is brought into close contact, the bolt 18 is set, and the cylinder 2 is
The legs 28 of the pedestal 26, which had been contracted by the operation in step 9, are extended, and the legs 28 are positioned at the midway positioning part 30, and the tips of the legs 28 are fixed to the upper end of the support column 7a of the outer mast 7 with the holding metal fitting 31. By doing so, the load from the inner mast 1 side is transmitted to the outer mast 7 side via the telescopic frame 26 (see FIG. 17).

Incidentally, if a high self-supporting height is not required, that is, if only the inner mast 1 suffices, as an applied example of the present invention, the crane can be erected by directly installing the telescopic frame 26 on the foundation 10.

As mentioned above, according to the present invention, () the load on the inner mast side can be received on the outer mast side, so that the guide mast, rollers,
Lifting devices such as bolts only need to bear the load during lifting and lowering (the moment and load during normal work are overwhelmingly larger than the load during lifting and lowering), so the size and weight of this part can be reduced. can be achieved.

() Since the load flow is simple due to the above (), there is less worry about "backlash" between the inner and outer masts, the deflection of the entire crane can be reduced, and there is no need to worry about maintenance, increasing safety. can be improved.

() It is no longer necessary to secure a working radius of 0m (or around 0m) and the fulcrum of the jib can be moved forward compared to before, making it economical to shorten the jib and reducing the rear turning radius. Therefore, it is advantageous to work in narrow spaces.

() Since it is not necessary to pass the inner mast through the inside of the swing frame or the swing ring, the strength of this part can be increased, and the size and weight of this part can be reduced.

() Since the work of taking in and assembling the inner and outer masts can be done near the ground using a single trolley, workability (particularly the block formation of the outer mast) is good, and there is no need to work at heights, so safety is improved. It is expensive and also saves the labor of the workers.

() Specially skilled workers are not required as the work is done in low places.

() It is efficient because the lifting device can be used to raise and lower the inner mast and the outer mast.

() Since there is less "double" between the inner and outer masts, the number of inner masts used can be reduced.

() Since the lifting device is located near the bottom of the inner mast during work, the wind load and seismic load applied to the entire crane can be reduced.

() As a countermeasure against strong winds, the inner mast and rotating body can be lowered in a short time after a forecast is issued without removing the inner mast, which can alleviate the effects of strong winds and reduce the weight of the aircraft. It can be designed to

It can produce excellent effects such as

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams showing the elevating system of a conventional climbing crane, FIG. 4 is an explanatory diagram of the elevating device and loading cart in the climbing crane of the present invention, and FIG. 5 is a view from the - arrow in FIG. Figure 6 is a plan view of the trolley when transporting the inner mast, Figure 7 is a plan view of the trolley when transporting the outer mast, and Figure 8 is a side view of the main parts of the climbing crane of the present invention. FIG. 9 is a view from the direction of the arrow in FIG. 8, FIG. 10 is a view from the direction of the arrow in FIG. FIG. 2 is a plan view of the telescoping frame when it moves up and down inside the outer mast. 1...Inner mast, 2...Swivel body, 7...Outer mast, 7
a...Main pillar, 13...Elevating device, 22...Guide rail, 23...Dolly, 26...Extensible frame, 27...Base part,
28...Leg, 29...Cylinder.

Claims (1)

[Claims] 1. In a climbing crane that uses both an inner mast and an outer mast, the outer mast is used as a support structure between the inner mast that supports the revolving structure and the upper end of the reinforcing material between the main pillars at the four corners of the outer mast. The outer mast is equipped with a lifting device capable of raising and lowering the inner mast and also raising and lowering the outer mast using the inner mast as a support structure, and the outer mast is configured with a platform that can be connected to the lower end of the inner mast located at the lowest stage. It has an extendable pedestal that is fixed to the upper ends of the main columns at the four corners and has legs that can extend and contract radially from the platform in a diagonal direction toward the main columns, and is capable of transmitting the load from the inner mast side to the outer mast side. Further, a planar rod having a recess, which is laid on the foundation and extends from the outside of the outer mast to both sides of the anchor mast for the inner mast, has a concave portion that can freely move in and out of the outer mast and that allows the inner mast to move in and out. It has a shape in which an additional inner mast and an attachment for carrying the telescoping frame can be attached and detached on the inside thereof, and a carriage that can be attached and detached on the outside of the attachment for carrying the additional outer mast is provided so as to be freely movable. Features a climbing crane.