JP2002060175A - Bridge type crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge type crane preventing wheels suspending a crane from floating from a beam even on a slope track. SOLUTION: This bridge type crane 10 capable of traveling on the track 14 includes a frame 16 having a girder 24 extending in the direction crossing the track, a beam 18 supported by the girder of the frame and extending along it, and the crane 20 suspended from the beam via, at least, the pair of wheels 44. The beam can swing about an axis in parallel to the girder 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bridge crane, and more particularly to a bridge crane suitable for use in a tunnel under construction.

[0002]

2. Description of the Related Art Conventionally, a bridge-type crane running on a track installed on the bottom of a tunnel has been used for transporting a segment used for lining a tunnel wall excavated by a shield machine. Have been.

[0003] The conventional bridge-type crane comprises a beam fixed to the beam of a frame having a beam extending transversely to the track and extending along the beam, and the beam suspended from the beam via one or more pairs of wheels. The segment is suspended from the hoist for transport thereof, and the hoist is moved along the beam to determine the unloading position of the segment. .

[0004] By the way, where the track defining the traveling path of the bridge-type crane is inclined, the posture of the beam which has been in the horizontal state is inclined. As a result, one of the two wheels suspended from the lifting device rises from the running surface of the beam, and the other wheel receiving the partial load may be damaged.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bridge-type crane in which the wheels suspending the hoist do not rise even on an inclined track.

[0006]

According to the present invention, there is provided a bridge-type crane capable of traveling on a track, a frame having a girder extending in a direction transverse to the track, and a frame supported on and along the girder of the frame. And a hoist suspended from the beam via at least one pair of wheels, the beam being pivotable about an axis parallel to the spar.

[0007]

According to the present invention, the beam defining the running surface of at least one pair of wheels suspending the hoist is swingable about an axis parallel to the spar supporting it. From now on, when the bridge crane is on an inclined track, the beam swings around the axis by an angle equal to the angle of inclination and its attitude is kept horizontal. As a result, the inclination of the beam and one of the two wheels suspending the lifting device to the beam are prevented from rising from the running surface of the beam, and this also prevents the bridge crane from traveling on the inclined track. Damage to the wheel can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a bridge crane according to the present invention is indicated generally by the numeral 10.

The bridge type crane 10 is used to supply the segments 11 used for lining a tunnel wall (not shown) excavated by a shield machine (not shown). It is used as a transport means for transporting from a tunnel entrance to a predetermined place in the tunnel or on a bogie waiting at the predetermined place.

For this reason, on the bottom surface 12 of the tunnel,
A pair of parallel tracks 14 on which the bridge crane 10 can travel is provided.

The bridge crane 10 includes a frame 16, a beam 18, and a hoist 20.

The frame 16 includes a pair of generally triangular leg members 22 opposed to each other, and a spar 24 disposed between the tops of the two leg members 22 and fixed to the tops.

The illustrated leg member 22 has a bottom extending along the bottom of the triangle, and a pair of wheels 26 is provided on the bottom. Both wheels 26 of each leg member are made of a metal material such as steel, and can roll on each track 14. Both wheels 2
The rolling of 6 causes the bridge-type crane 10 to travel on the track 14.

In the illustrated example, a driving device 28 for applying a rotational driving force to each wheel 26 is attached to the bottom of the leg member 22. The driving device 28 includes, for example, an electric motor 308 and a reduction gear mechanism 32 connected to the electric motor and each wheel 26.

The spar 24 supported by the two leg members 22 has a rectangular cross-sectional shape in the illustrated example, and extends horizontally in a direction crossing the two tracks 14.

The beam 18 is disposed below and parallel to the spar 24 and is supported by the spar 24.

More specifically, beam 18 is sparged via three pairs of brackets 34, plates 36 received between each pair of brackets 34, and pins 38 passing through each pair of brackets 34 and plate 36. 24.

The three pairs of brackets 34 are spaced from each other in the longitudinal direction of the spar 24, are fixed to the lower surface of the spar 24, and extend downward. The plate 36 is fixed to a later-described upper flange 40 of the beam 18 and extends upward. Each pin 38 extends in the direction in which the beam 24 and the beam 18 extend. Of course, the axis of each pin 38 is on a common straight line. From this, the beam 18 is
About the axis of the pin 38, that is, the axis of the pin 38. In the illustrated example, the pin 38 is formed by a shaft of a bolt, and a nut is screwed to the bolt.

The beam 18 has an H-shaped cross section and includes a flange 42 serving as an upper flange 40.

Between the upper flange 40 and the lower flange 42 of the beam 18, at least one pair of wheels, in the example shown two pairs of wheels 44, are spaced apart from each other in the longitudinal direction of the beam 18. . The wheels 44 are made of a metal material such as steel.

Each pair of wheels 44 is associated with a respective beam 18
Are mounted on the lower flange 42 on both sides of the web 46 connected to the two flanges 40 and 42. Accordingly, the lifting device 20 travels on the beam 18 by rolling of the wheels 44 on the lower flange 42.

The two pairs of wheels 44 are rotatably supported by a pair of vertical bearing plates 48 facing each other.
The lifting device 20 is fixed to these bearing plates 48.
As a result, the hoisting device 20 transmits the beam 1 via the wheels 44.
Hanged at 8.

The lifting device 20 includes an electric chain block,
It consists of an electric hoist as shown in the figure, and suspends the segment 11 while moving in the tunnel.

In the illustrated example, a driving device 50 for rotationally driving one of the wheels 44 of each pair is provided. By operating the driving device 50 to apply rotational power to each pair of driving wheels 44, the lifting device 20 and the segment 11 suspended therefrom can be moved from one end of the beam 18 to the other end. it can. In addition, the operation of the lifting device 20 allows the segments 11 of the suspended body to be unloaded onto the bottom surface 12 of the tunnel.

In the bridge crane 10 of the present invention, as described above, since the beam 18 can swing around the pin 38, the bridge crane 10 is inclined from the horizontal track 14 (FIG. 2). When the beam 18 moves to the track 14 (FIG. 3), the beam 18 swings around the pin 38 by the inclination angle, and maintains the same attitude (horizontally extending attitude) as when the beam 18 was on the horizontal track 14.

For this reason, the lower flange 42 of the beam 18
And the contact state with the wheel 44 on the lower flange 42 does not change. That is, one of the wheels 44 of each pair does not move upward from the lower flange 42, and therefore, the effect of the eccentric load on the other wheel 44 and the breakage of the wheel 44 receiving the eccentric load occur when the wheel 44 separates from the lower flange 42 In addition, destruction can be prevented.

Although the bridge-type crane 10 has been described for transporting the segment 11 in a tunnel, it can be used for other purposes.

[Brief description of the drawings]

FIG. 1 is a front view of a bridge crane according to the present invention.

FIG. 2 is a longitudinal sectional view taken along line 2-2 of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a longitudinal sectional view similar to FIG. 2 of a bridge crane on an inclined track.

FIG. 5 is a partially enlarged view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bridge type crane 14 Track 16 Frame 18 Beam 20 Hoist

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Masao Kajiyama 1-8 Tsukudocho, Shinjuku-ku, Tokyo Inside the Kumagaya Gumi Tokyo Branch (72) Inventor Hirokazu Tanaka 2-1 Tsukudocho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo head office F-term (reference) 3F202 AA05 AA08 CB01 CE01

Claims (1)

[Claims] 1. A bridge-type crane operable on a track, comprising: a frame having a girder extending in a direction transverse to the track; a beam supported by the girder of the frame and extending along the girder; A lifting device suspended via at least one pair of wheels, wherein the beam is pivotable about an axis parallel to the spar.