JPH09255277A - Structure for hanging long member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long member (boom or the like of a container crane) hanging structure capable of reducing the shaking width (difference between maximum deflection and minimum deflection) of a main member by eliminating the influence of the self-weight deformation of an oblique tensile member. SOLUTION: The tip side 2a-1 of a boom 2a as a long and large main member and the upper end part 1a of a pillar 1 are connected to each other by an oblique tensile member 13 and the intermediate point 13a of this oblique tensile member 13 and the base end side 2a-2 of the boom 2a are connected to each other by a connecting member 10. The oblique tensile member 13 and the connecting member 10 have resistance to a tensile force while these are not resistant to a compressing force being contracted or bent, and further, the connecting member 10 connects the intermediate point 13a and the base end side 2a-2 to each other via an attaching length changing device for changing the attaching length of the connecting member 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for suspending a long member, and is particularly useful when applied to a structure for suspending a long member, such as a boom of a container crane, which receives a variable load.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to a container crane for transporting a load 8 on land g to a ship s on the sea or a load 8 on ship s to the land g as shown in FIG. To do.

This container crane comprises an upright pillar 1, a horizontal main member 2 on which a trolley 6 travels, a tip end side of the main member 2 and an upper end of the pillar 1 located above the tip end side. A trolley 6 that is configured to have an oblique tension member 3 that supports the main member 2 so as to maintain the horizontal state by connecting with the portion 1a, and reinforcing members 4 and 5, and that suspends a load 8 via a hanging wire 7. However, they move on the main member 2 to carry out cargo handling.

Generally, an I-shaped cross-section beam or a box-shaped cross-section beam is used as the main member 2, and an I-shaped steel or cable having a small bending rigidity is used as the diagonal tension member 3 because only normal tension normally acts. To be done.

A total load of the frame weight, the trolley 6 weight and the load 8 acts on the main member 2 and the diagonal tension member 3,
The stress generated in each member and the deflection of the main member 2 vary depending on the position of the trolley 6.

[0006] Conventionally, the main member 2 and the diagonal tension member 3
The cross section of the members such as the above is such that the stress generated when the load is applied becomes less than the allowable stress, and in order to maintain the driving performance, the fluctuation of the deflection δ, that is, the trolley 6 is the tip of the main member 2. Deflection δ when part is on the edge (sea side edge)
₁ and the minimum deflection δ ₀ when the trolley 6 is on the base end side (land side) of the main member 2 (runout width) Δ (= δ ₁ −
δ ₀ ) is designed to be as small as possible.

[0007]

However, in the case of the strength design as described above, the deflection of the main member 2 becomes large as the load and the structural dimension become large, and the deflection width Δ becomes large.
Since = δ ₁ −δ ₀ also increases, it is necessary to increase the rigidity of each member, that is, the member cross section, in order to reduce this deflection.

On the other hand, as shown in FIG. 7, the main member 2 is supported.
The diagonal tension member 3 to be deformed by its own weight w (hereinafter referred to as the
(Referred to as “gag deformation”), and the magnitude of this zag deformation.
Varies depending on the tension generated in the diagonal tension member 3.
Now, when the trolley 6 is on the land side of the main member 2 and the sea side
Tension and Zag deformation at the end are T₀, F
₀And T₁, F₁Then, the tension fluctuation ΔT = T₁−
T₀The elongation variation ΔL of the oblique tension member 3 with respect to
It is expressed by the following formula 1. As shown in the equation (1),
The influence of zag deformation on the elongation variation ΔL of the tensile member 3 (Equation 1 formula)
The second term on the right side of
Main member 2 compared to the case of only the shape (the first term on the right side of the equation 1)
There is a drawback that the deflection becomes large.

[0009]

[Equation 1]

Further, the zag deformation generated in the oblique tension member 3 has a characteristic that it increases as its own weight increases, and even if the cross-sectional area is increased in order to increase the tensile rigidity of the oblique tension member 3, the zag deformation is increased by that amount. There is also a drawback that the additional deformation becomes large and it is not effective in reducing the swing width Δ of the main member 2.

Therefore, in view of the above-mentioned prior art, the present invention eliminates the influence of the zag deformation of the oblique tension member and reduces the deflection width (difference between the maximum deflection and the minimum deflection) of the main member. (Boom of container crane, etc.)
It is an object to provide a suspension structure for the.

[0012]

Means for Solving the Problems A first method for solving the above problems is described below.
The invention of (1) is a structure for suspending a long member that supports the main member as a long member so as to keep the main member in a substantially horizontal state. While connecting the support portion located at the diagonal tension member, the intermediate portion of the diagonal tension member, and the base end side portion of the main member located below the intermediate portion or other support portion by the connecting member. Characterized by being connected.

In a second aspect based on the first aspect, the oblique tension member and the connecting member have a structure that resists tensile force but does not contract or bend by compressive force. It is characterized by

In a third aspect based on the first or second aspect, the connecting member is provided between an intermediate portion of the diagonal tension member and a base end side portion of the main member or another supporting portion. It is characterized in that the intermediate portion of the oblique tension member and the base end side portion of the main member or another supporting portion are connected to each other via the attachment length changing device having a configuration capable of changing the attachment length.

Therefore, according to the first, second or third aspect of the invention, when a load is applied to the main member, a tension is generated in the diagonal tension member to try to extend the zag deformation of the diagonal tension member. Because its movement is restrained by the connecting member,
Since the influence of the zag deformation (additional deformation) is eliminated, the deflection of the main member is mainly composed of a component due to elastic deformation, and the deflection width of the main member when the load position changes becomes small.

Further, according to the second aspect of the invention, since the oblique tension member and the connecting member have a structure that resists tensile force but not compressive force, the main member can be bent upward from an intermediate position. .

According to the third aspect of the invention, the mounting length varying device can change the mounting length of the connecting member to arbitrarily adjust the initial deflection of the main member.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. A container crane will be described as an example.

FIGS. 1 and 2 are schematic views of the essential parts of a container crane having a structure for suspending a long member according to an embodiment of the present invention (see FIG. 6 above for the overall structure), and FIGS. The structural diagram which shows the structural example of the connection member in the suspension structure of a long member, FIG. 5 is the structural example of the attachment length variable apparatus (illustration omitted in FIGS. 1, 2, 3, and 4) in the said suspension structure of a long member. It is a block diagram which shows.

As shown in FIGS. 1 and 2, an oblique tension member 13 is installed between the column 1 and the boom 2a, which are the main members of the container crane. That is, the tip side 2a-1 of the boom 2a, which is a long main member, and the tip side 2a
The upper end portion 1a of the column 1 located above a-1 is connected by an oblique tension member 13 and the boom 2 is supported so as to maintain a horizontal state.

The midpoint 13a of the diagonal tension member 13
And the boom 2a located below the intermediate point 13a
The intermediate member 13a and the base end side portion 2a-2 are connected by the connecting member 10 stretched between the base end side portion 2a-2 and the base end side portion 2a-2.

The boom 2a is connected to a girder 2b which is a main member of the container crane by a connecting portion 11, and is connected by a boom hoisting wire 12 which is connected to the boom 2a via the upper end of the pillar 1 as shown in FIG. The structure is such that it can rotate in the vertical direction with the portion 11 as a fulcrum.

The diagonal tension member 13 has a small bending rigidity I.
Shaped steel is used, and a link 9 is interposed in the middle part of the shape steel, which has a structure that resists tensile force but does not resist compressive force. Can be easily bent.

The connecting member 10 is a connecting member 10a having a telescopic structure as shown in FIG. 3, a connecting member 10b having a structure in which links are connected as shown in FIG. 4, or a connecting member having a wire structure. Similar to the tension member 13, it has a structure that resists a tensile force but does not resist a compressive force, and can easily contract or bend when subjected to a compressive force.

Further, as shown in FIG. 5, a mounting length varying device (for example, a hydraulic jack) 14 is provided between the end portion of the connecting member 10 and the base end side portion 2a-2 of the boom 2a. ing. That is, the connecting member 10 is the attachment length varying device 1
The attachment length of the connecting member 10 which connects the intermediate point 13a and the base end side portion 2a-2 via 4 can be arbitrarily changed by the attachment length changing device 14. .

Next, the function and effect of the suspension structure for the long member having the above-mentioned structure will be described.

Prior to the operation of the container crane, the attachment length of the connecting member 10 is adjusted by the attachment length changing device 14, and the diagonal tension member 13 is subjected to arbitrary zag deformation (deformation of the diagonal tension member 13 due to its own weight ... No. 7 diagonally tensioned material 3)).

Now, when the trolley 6 with the load 8 suspended via the suspension wire 7 moves from the girder 2b to the boom 2a, the boom 2a is bent due to the total weight of the trolley's own weight and the load amount, A predetermined tension is generated in the diagonal tension member 13. This tension tends to stretch the diagonal tension member 13 in the direction in which the zag deformation is reduced, but this movement is restrained by the connecting member 10 and the zag deformation is held in the original state, whereby the addition based on the zag deformation is performed. The deformation component is removed, and the deflection of the boom 2a is mainly due to the elastic deformation of the crane structural member.

Therefore, the trolley 6 is placed on the girder 2b.
Minimum deflection δ of boom 2a ₀And trolley 6
Maximum deflection of the boom 2a when it is at the tip of the boom 2a
Only δ ₁Difference, that is, the swing width Δ = δ₁−δ₀Is small
Driving performance is improved.

Next, when the boom 2a has a large deflection in the initial stage due to the tilting or rotation of the crane as a whole and the driving performance during loading and unloading is hindered, the connecting member is changed by the mounting length changing device 14. By shortening (or lengthening) the mounting length of the boom 10, the boom 2a is pulled up (or pulled down) via the diagonal tension member 13, and the boom 2a is pulled up.
The initial deflection of the can be adjusted.

Further, as shown in FIG. 2, the boom 2a is rotated from the connecting portion 11 by the boom hoisting wire 12 for the purpose of not hindering the berthing or departure of the ship or ensuring the safe traveling of the crane. It can be rolled up. At this time, the diagonal tension member 13 is bent from the link 9 portion, and at the same time, in the case where the connecting member 10 is the connecting member 10a shown in FIG. 3, the length thereof is automatically shortened in conjunction with this, as shown in FIG. In the case of the connecting member 10b, an intermediate portion can be arbitrarily bent, and in the case of a wire, it can be appropriately bent so that the boom 2a can be hoisted without any trouble. Of course, the boom 2a can be lowered without hindrance.

In this embodiment, the attachment point (base end side portion 2a-2) on the boom 2a side of the connecting member 10 is provided at a position slightly apart from the connecting portion 11 as shown in FIG. It is not limited to the above, but the vicinity of the connecting portion 11 and the girder 2b
It is also effective to provide it on the side, and further on the pillar 1 or the like.

[0033]

As described above in detail with the embodiments of the present invention, according to the present invention, a connecting member for connecting the intermediate portion of the diagonal tension member and the base end side portion of the main member or other supporting portion. The additional deformation due to the zag deformation that occurs in the diagonal tension member is eliminated by the provision of the, and the deflection of the main member is mainly due to the elastic deformation of the structure, and when the load position changes, The swing width of the member is also reduced. Therefore, for example, in a container crane, the swing width of the boom can be reduced to improve the driving performance.

Further, by constructing the oblique pulling member and the connecting member so as to resist the tensile force but not the compressive force, the main member can be bent vertically from the middle position. Therefore, for example, in a container crane, the boom can be rotated in the vertical direction so as not to interfere with the berthing of a ship or to ensure safe traveling of the crane.

Further, by providing a mounting length varying device capable of changing the mounting length of the connecting member, the initial deflection of the main member can be arbitrarily adjusted. Therefore, for example, in a container crane, the initial deflection of the boom can be arbitrarily adjusted to further improve the driving performance.

As described above, it is possible to reduce the swing width of the main member, to bend the main member in the middle, and to arbitrarily adjust the initial deflection of the main member. Therefore, the suspension structure of the member of the present invention can be widely applied.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram of a container crane having a structure for suspending a long member according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram (a state in which a boom is rotated) of a container crane having a suspension structure of a long member according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a structural example of a connecting member in the suspension structure of the long member.

FIG. 4 is a configuration diagram showing another structural example of a connecting member in the suspension structure of the long member.

FIG. 5 is a configuration diagram showing a structural example of an attachment length varying device (not shown in FIGS. 1, 2, 3, and 4) in the suspension structure of the long member.

FIG. 6 is an overall configuration diagram of a conventional container crane having a suspension structure of long members.

FIG. 7 is an explanatory diagram showing zag deformation of the diagonal tension member.

[Explanation of symbols]

 1 pillar 1a upper end 2a boom 2a-1 front end side 2b-2 base end side 2b girder 9 link 10, 10a, 10b connecting member 11 connecting part 12 boom hoisting wire 13 diagonal tension member 13a middle part 14 installation length variable apparatus

Front Page Continuation (72) Inventor Daisuke Furuta 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory

Claims (3)

[Claims] 1. A suspending structure for a long member that supports the main member as a long member so as to maintain the main member in a substantially horizontal state, wherein the leading end side portion of the main member and the tip end side portion The diagonally extending tension member is used to connect the upper supporting portion and the intermediate portion of the diagonal tension member, and the base end side portion or other supporting portion of the main member located below the intermediate portion is a connecting member. Suspended structure of long members characterized by being connected by. 2. The structure for suspending a long member according to claim 1, wherein the oblique tension member and the connecting member have a structure that resists tensile force but does not contract by compressing force or bending. The structure for suspending a long member, characterized in that 3. The structure for suspending a long member according to claim 1, wherein the connecting member is between an intermediate portion of the diagonal tension member and a base end side portion of the main member or another supporting portion. Is connected to an intermediate portion of the oblique tension member and a base end side portion of the main member or another support portion via an attachment length changing device having a configuration capable of changing the attachment length. Long member suspension structure.