JPH0648683A - Tower crane - Google Patents

Abstract

PURPOSE:To provide a tower crane wherein work for laying a beam of a building can be efficiently and economically performed by eliminating necessity for a lock pin insertion hole so that a lift device can be lifted to move along a mast where a beam joint is previously protruded. CONSTITUTION:In a tower crane 1 of utilizing a mast 2 as a pillar of a building, the crane is constituted such that a beam joint 22 of the building is overhung with a space provided in a height direction of the mast 2, and a telescopically operable lift device 3 of connecting upper/lower part frames 31, 32 by a jack 33 is lifted in a measurer like manner along the mast 2 by stopping the upper/ lower part frames 31, 32 hooked to the beam joint 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower crane equipped with a lifting device that uses a mast as a pillar of a building after use.

[0002]

2. Description of the Related Art A tower crane used for the construction of a high-rise building has its mast used as a pillar of a building after use. By the way, this tower crane is equipped with a lifting device for lifting. In the conventional tower crane, a steel pipe is used for the mast, and insertion holes for the lock pins of the lifting device are opened in the steel pipe at equal intervals in the height direction. On the other hand, the elevating device has two upper and lower frames which are constituted by a frame body which is just externally mounted on the steel pipe, and the frames are connected by a climbing jack to be extendable and contractible. Further, the upper and lower frames are provided with lock pins that can be projected and housed in order to fit into the insertion holes of the steel pipe. When the lifting device is moved up and down, the climbing jacks are repeatedly expanded and contracted, and at the same time, the lock pins of the upper and lower frames are inserted instead of the insertion holes of the steel pipe, and the weight of the lifting device is transferred to the steel pipe through the lock pin. While depositing, move up and down like a scale.

[0003]

Problems to be Solved by the Invention The above-described conventional tower crane has the following problems. <a> The steel pipe that the hoisting device moves up and down requires an insertion hole for the lock pin, and if the steel pipe is used as a pillar of a building, the insertion hole must be closed and the work process is complicated. there were. <B> If there is a protrusion on the outer peripheral surface of the steel pipe, the lifting device cannot be moved up and down, so that the beam joint required for the column cannot be attached to the steel pipe in advance. Therefore, the beam joint or the beam must be directly welded to the steel pipe erected at the site, which causes a decrease in work efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. The object of the present invention is that a lock pin insertion hole is not required and a beam joint is provided along a mast. (EN) Provided is a tower crane capable of vertically moving a lifting device and efficiently and economically constructing a building beam.

[0005]

[Means for Solving the Problems] That is, according to the present invention, in a tower crane that uses a mast as a pillar of a building, the beam joints of the building are projected at intervals at intervals in the height direction of the mast. A tower crane constructed by a telescopic lifting device in which a frame and a lower frame are connected by a jack so that the upper and lower frames are hooked on the beam joint and lifted and lowered like a scale along the mast. Is.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a tower crane 1
Is a mast 2 in which beam joints 22 are projected at equal intervals in the height direction.
And a boom 4 and an operation chamber 5 installed above the lifting device 3. Each part will be described in detail below. <A> Configuration of Mast (FIGS. 2, 4, and 5) The mast 2 is, as shown in FIG. 2, a columnar body 21 made of a steel pipe having a rectangular cross section, and the surface of the columnar body 21 in the height direction. It is formed by the beam connection 22 protruding at intervals. In this example,
There are cases where the beam connection 22 is extended in four directions on the four surfaces of the column 21. The mast 2 configured in this way is used as a pillar of a building after use, and is also used as a movement path of the lifting device 3 described later. The beam connection 22 is a mast 2,
It is a part that is attached as a joint of a beam 24 of a building that is laid horizontally between two, and can be used as a hooking member when the lifting device 3 moves, and is made of, for example, H steel. Also, as shown in FIGS. 4 and 5, V is placed on the beam joint 22.
A pedestal 25 having a V-shaped groove may be installed.

<B> Elevating device (FIGS. 1 and 3) As shown in FIG. 3, the elevating device 3 includes an upper frame 31, a lower frame 32, a climbing jack 33, a lock pin 34, and a guide roller 35. It is composed of The upper frame 31 and the lower frame 32 are formed of a frame body, and are externally mounted with the mast 2 penetrating therethrough. That is,
It is located on the outer peripheral surface of the beam joint 22, and is formed in a size that does not contact the beam joint 22. The upper frame 31 and the lower frame 32 have guide rollers 35 placed at their corners, and lock pins 34 provided inside. The wheel of the guide roller 35 is provided with a groove at the center. This guide roller 3
Reference numeral 5 is a portion that matches the corner portion of the pillar body 21 of the mast 2 and keeps the space between the lifting device 3 and the mast 2 constant to prevent the lifting device 3 from rotating in the horizontal direction. The lock pin 34 is
The upper frame 31 and the lower frame 32 are provided so as to project inside, and are configured so that they can be horizontally projected and housed by a jack installed at the base thereof. The climbing jack 33 is a jack that connects the upper frame 31 and the lower frame 32 such that they can expand and contract. The climbing jack 33 has a length corresponding to one section of the beam joints 22 and 22 of the mast 2 at least when contracted, and a length corresponding to two sections of the beam joints 22 and 22 when expanded, so that the climbing jack 33 is expanded and contracted to thereby form the upper frame 31. The distance between the lower frame 32 and the lower frame 32 can be adjusted. As shown in FIG. 1, scaffolding 3 is provided around the upper frame 31 and the lower frame 32.
6 may be provided.

<C> Boom and operation room (FIG. 1) The boom 4 is a device for hoisting and carrying building members such as the beams 24, and can be a known device. Control room 5
Controls the operation of the lifting device 3 and the boom 4. The boom 4 and the operation chamber 5 are placed on the upper frame 31 of the lifting device 3 and move up and down together with the lifting device 3.

[0009]

Next, a method of operating the tower crane 1 will be described. <a> Standing of mast (FIGS. 1 and 6) As shown in FIG. 1, the climbing jack 3 of the lifting device 3 is contracted, the lock pins 34 of the upper frame 31 and the lower frame 32 are projected, and the lifting device 3 is moved. Is hung on the pedestal 25 of the beam connection 22 of the mast 2. Then, as shown in FIG. 6, the mast 2 is separately lifted and connected to the extension portion above the mast 2 on which the lifting device 3 is hooked by the crane 4.

<B> Movement of Lifting Device (FIGS. 6 and 7) In FIG. 6, the lock pin 34 of the upper frame 31 is housed. Then, the climbing jack 33 is extended to move the upper frame 31, the boom 4, and the operation chamber 5 upward. The extension of the climbing jack 33 is adjusted so that the lock pin 34 of the upper frame 31 comes to the upper part of the upper beam connection 22. Next, the lock pin 34 of the upper frame 31 is projected and hooked on the pedestal 25 of the beam joint 22. Then, the lock pin 34 of the lower frame 32 is housed, the climbing jack 33 is contracted, and the lower frame 32 is raised. When the lower frame 32 is lifted up to the upper beam joint 22, the lock pin 34 is projected,
The beam connection 22 is hooked on the pedestal 25 to complete the movement of the lifting device 3. In this way, the building of the building is constructed by repeating the standing of the mast 2 and the movement of the lifting device 3.

[0011]

Since the present invention is as described above, the following effects can be obtained. <B> Since the lifting device is moved up and down by hanging it on the beam connection protruding from the mast, it is not necessary to open the lock pin insertion hole in the mast as in the conventional case, and the insertion hole is closed. Is also unnecessary. <B> Because the beam joint can be attached to the mast in advance, the work of welding the beam joint to the mast that was erected on site at the site can be saved, and the work of constructing the beam of the building can be performed very efficiently. You can

[Brief description of drawings]

[Figure 1] Illustration of tower crane

FIG. 2 is a perspective view of the mast.

FIG. 3 is a perspective view of a lifting device

FIG. 4 is a sectional view of the lifting device and the mast.

FIG. 5: Side view of lifting device and mast

[Figure 6] Illustration of the movement of the tower crane

[Fig.7] Illustration for moving the tower crane

Claims (1)

[Claims] 1. In a tower crane using a mast as a pillar of a building, beam joints of the building are projected at intervals in the height direction of the mast, and the upper frame and the lower frame are connected by a jack. A tower crane, in which the above-described telescopic lifting device is configured to lift the upper frame and the lower frame on the beam joint and raise and lower along the mast in a worm-like manner.