JP3268195B2 - Suspension structure for long members and crane boom suspension structure - Google Patents

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.
Also, the present invention relates to a crane boom suspension structure , and is particularly useful when applied to a suspension structure of a long member that receives a variable load such as a boom of a container crane.

[0002]

2. Description of the Related Art The prior art will be described by taking as an example a container crane which transports a load 8 on land g to a ship s on the sea or a load 8 on ship s on land g as shown in FIG. I do.

In this container crane, an upright column 1, a horizontal main member 2 on which a trolley 6 travels, a front end portion of the main member 2 and an upper end of the column 1 located above the front end portion. A trolley 6 which has an oblique tension member 3 for supporting the main member 2 so as to keep the main member 2 in a horizontal state by connecting the portion 1a, and reinforcing members 4, 5 and the like; Moves on the main member 2 to perform cargo handling.

Generally, an I-shaped beam or a box-shaped beam is used as the main member 2, and an I-shaped steel or a cable having a low bending stiffness is used as the diagonal tension member 3 because usually only tension acts. Is done.

[0005] A total load of the frame's own weight, the trolley 6's own weight, and the load 8 weights acts on the main member 2 and the oblique 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.

Conventionally, the main member 2 and the oblique tension member 3
The cross-section of the member such as the trolley 6 is adjusted so that the stress generated when receiving the load is equal to or less than the allowable stress, and the trolley 6 Deflection δ when at the end (sea end)
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 above-described strength design, the deflection of the main member 2 particularly increases as the load and the structural size increase, and the deflection width Δ
= Δ ₁ −δ ₀ also increases, so that 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.
The oblique tensile material 3 undergoes deformation due to its own weight w (hereinafter, the
(Referred to as “sag deformation”).
Fluctuates depending on the tension generated in the oblique tension member 3.
Now, when the trolley 6 is on the land side of the main member 2 and on 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 obliquely drawn material 3 with respect to
It is expressed by the following equation (1). As shown in equation (1),
The effect of zag deformation on the elongation variation ΔL of the tensile material 3 (Equation 1)
Is added to the second term on the right side of the
Main member 2 compared to the case of only shape (the first term on the right side of Equation 1)
However, there is a disadvantage that the deflection becomes large.

[0009]

(Equation 1)

Further, the sag deformation generated in the obliquely pulled member 3 has a characteristic that it increases as its own weight increases. Even if the cross-sectional area of the obliquely drawn member 3 is increased in order to increase the tensile rigidity, the sag is correspondingly increased. There is also a disadvantage that the additional deformation becomes large and is not effective in reducing the runout width Δ of the main member 2.

Therefore, in view of the above prior art, the present invention eliminates the influence of the sag deformation of the obliquely tensioned member and reduces the deflection width (difference between the maximum deflection and the minimum deflection) of the main member. (Container crane boom, etc.)
An object of the present invention is to provide a suspension structure.

[0012]

Means for Solving the Problems A first method for solving the above problems is described below.
The invention of the above is a suspension structure of a long member that supports the main member such that the main member that is a long member keeps a substantially horizontal state, and a tip side portion of the main member and an upper side than the tip side portion. And the supporting portion located at the same position by an oblique tension member, and an intermediate portion of the oblique tension member and a base end portion or another supporting portion of the main member located below the intermediate portion by a connecting member. Connected, the connecting member is the oblique tension
Between the middle part of the material and the base end of the main member or other support
Variable installation length device with variable installation length
Through the intermediate portion of the obliquely tensioned member and the base of the main member.
It is connected to the end side part or another supporting part .

According to a second aspect of the present invention, in the first aspect, the diagonal tension member and the connecting member have a structure that resists a tensile force but contracts or bends and does not resist a compressive force. It is characterized by the following.

According to a third aspect of the present invention, the girder is connected to the girder at a connecting portion.
And a structure that can be turned up and down around the connecting portion.
Support the boom so that it is almost horizontal.
That a hanging structure of the crane boom, the boom
The tip side and the support portion located above the tip side
And the diagonal tension member, and this diagonal tension
An intermediate portion of the material and the above-mentioned bush located below the intermediate portion.
To the base end of the arm or other support
In other words, the diagonal tension member and the connecting member are subject to a tensile force.
Resists, but resists compressive force by shrinking or bending
It is characterized by having a structure that does not .

Therefore, according to the first, second or third aspect of the present invention, when a load is applied to the main member, tension is generated in the obliquely tensioned material, and the obliquely stretched material attempts to extend the zag deformation. Because the movement is restricted by the connecting member,
As the influence of the sag deformation (additional deformation) is eliminated, the deflection of the main member is mainly caused by the elastic deformation, and the deflection width of the main member when the load position changes is reduced. In addition, the connecting member can be removed
Arbitrary adjustment of the initial deflection of the main member by changing the attachment length
can do.

According to the second aspect of the present invention, since the obliquely pulling member and the connecting member have a structure that resists a tensile force but does not resist a compressive force, the main member can be bent upward from an intermediate position. .

According to the third aspect of the present invention, the boom can be loaded.
When weight acts, tension is generated in the diagonally pulled material and
Attempts to stretch the sag of the tensile material
Is restrained by the connecting member
(Additional deformation) has been removed and the boom
The load position changes mainly due to elastic deformation.
In this case, the swing width of the boom also becomes smaller. In addition, diagonal pull
Tension members and connecting members resist tensile force, but resist compressive force.
Is a structure that does not resist, rotate the boom upward
Can be

[0018]

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

FIG. 1 and FIG. 2 are main part configuration diagrams of a container crane having a long member suspension structure according to an embodiment of the present invention (refer to FIG. 6 for the overall configuration), and FIGS. FIG. 5 is a structural view showing a structural example of a connecting member in a hanging structure of a long member, and FIG. 5 is a structural example of a variable attachment length device (not shown in FIGS. 1, 2, 3, and 4) in the hanging structure of the long member. FIG.

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

Then, an intermediate point 13a of the obliquely pulled material 13
And the boom 2a located below the intermediate point 13a
The intermediate point 13a and the base end 2a-2 are connected by a connecting member 10 stretched between the base end 2a-2 and the base end 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 connected to the boom 2a via the upper end of the column 1 as shown in FIG. It has a structure that can be turned up and down with the part 11 as a fulcrum.

The obliquely tensioned material 13 has a low bending rigidity.
Shaped steel is used, and a link 9 is interposed in the middle part, and it 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. Like the tensile material 13, the material 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, between the end of the connecting member 10 and the proximal end 2a-2 of the boom 2a, a variable mounting length device (for example, a hydraulic jack) 14 is provided. ing. That is, the connecting member 10 is attached to the variable attachment length device 1.
The intermediate point 13a and the base end portion 2a-2 are connected to each other via the connecting member 4, and the mounting length of the stretched connecting member 10 can be arbitrarily changed by the mounting length varying device 14. .

Next, the operation and effect of the above-described structure for hanging a long member will be described.

Before the operation of the container crane, the attachment length of the connecting member 10 is adjusted by the attachment length variable device 14, and the oblique tension member 13 is deformed in an arbitrary zag (deformation due to its own weight of the oblique tension member 13). 7) is restrained.

When the trolley 6 hanging the load 8 via the hanging wire 7 moves from the girder 2b to the boom 2a, the boom 2a bends under the total load of the trolley's own weight and the load. A predetermined tension is generated in the oblique tension member 13. This tension tends to stretch the diagonal tension member 13 in a direction in which the sag deformation is reduced, but this movement is restrained by the connecting member 10 and the sag deformation is maintained in the original state, thereby adding an additional force based on the zag deformation. The deformation component is removed, and the bending of the boom 2a mainly includes the deformation component due to the elastic deformation of the crane structural member.

For this reason, the trolley 6 is placed on the girder 2b.
Deflection δ of boom 2a when moving ₀And trolley 6
Maximum bending of boom 2a when at the tip of boom 2a
Only δ ₁, Ie, the swing width Δ = δ₁−δ₀Is small
Driving performance is improved.

Next, if the boom 2a has a large deflection in the initial stage due to, for example, the tilting or rotation of the entire crane, which hinders the operation performance during loading and unloading, the connecting member is changed by the variable mounting length device 14. By shortening (or lengthening) the mounting length of the boom 10, the boom 2 a is pulled up (or pulled down) via the oblique tension member 13, and the boom 2 a
The initial deflection can be adjusted.

As shown in FIG. 2, the boom hoisting wire 12 rotates the boom 2a from the connecting portion 11 so as not to hinder the berthing or departure of the ship, or to ensure safe traveling of the crane. And can be wound up. At this time, the oblique tension member 13 bends from the link 9 portion, and at the same time, when the connecting member 10 is the connecting member 10a shown in FIG. In the case of the connecting member 10b, an intermediate portion is arbitrarily bent, and in the case of a wire, the boom 2a can be wound without any trouble. Of course, the boom 2a can be lowered without hindrance.

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

[0033]

According to the present invention, as described above in detail with the embodiments of the present invention, the connecting member for connecting the intermediate portion of the oblique tension member to the base end portion of the main member or another supporting portion. As a result, the additional deformation based on the sag deformation generated in the obliquely pulled material is removed, and the deflection of the main member is mainly caused by the elastic deformation of the structure, and the main deformation when the load position changes. The deflection width of the member is also reduced. Therefore, for example, in a container crane, the swinging width of the boom can be reduced, and the operating performance can be improved.

In addition, the main member can be bent up and down from an intermediate position by forming the oblique pulling member and the connecting member so as to resist the tensile force but not the compressive force. Therefore, for example, in the case of a container crane, the boom can be turned up and down so as not to obstruct the berthing of the ship or to ensure safe traveling of the crane.

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

As described above, the swing width of the main member can be reduced, the main member can be bent from the middle, and the initial deflection of the main member can be arbitrarily adjusted. Therefore, the member suspension structure of the present invention can be widely applied.

[Brief description of the drawings]

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

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

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

FIG. 4 is a structural view showing another example of the structure of the connecting member in the hanging structure of the long member.

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

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

FIG. 7 is an explanatory diagram showing a zag deformation of an obliquely pulled material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillar 1a Upper end 2a Boom 2a-1 Tip side 2b-2 Base end 2b Girder 9 Link 10,10a, 10b Connecting member 11 Connecting part 12 Boom hoisting wire 13 Diagonal tension member 13a Intermediate part 14 Mounting length variable apparatus

Continuation of front page (72) Inventor Daisuke Furuta 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (56) References JP-A-60-213692 (JP, A) JP-A Heihei 8-49215 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 5/08

Claims (3)

(57) [Claims] 1. A hanging structure for a long member that supports a main member that is a long member so as to keep the main member in a substantially horizontal state, wherein the main member has a front end side portion and a front end side portion. An upper supporting portion is connected to the support portion by an oblique tension member, and an intermediate portion of the oblique tension member is connected to a base end portion or another supporting portion of the main member located below the intermediate portion. The connection member is connected to the middle portion of the obliquely tensioned member and the main portion.
Change the installation length between the base end of the material and other supports
The oblique pulling can be performed via a variable length mounting device of a possible configuration.
An intermediate portion of the upholstery and a proximal end of the main member or other support
And a hanging structure for a long member. 2. The suspension structure for a long member according to claim 1, wherein the obliquely-tensioned member and the connecting member have a structure that resists a tensile force but contracts or bends and does not resist a compressive force. A structure for suspending a long member. 3. A connecting part connected to the girder at a connecting part.
A boom that can rotate up and down around the fulcrum
Crane boot supporting the boom to keep it level
A suspension structure for the boom , wherein the boom is located at the tip side and above the tip side.
Connect the supporting part to the
Between the middle part of the slanted tensile material and the lower part
Connect the base end of the boom to be placed or another support
Connected by a material, the diagonal tensile member and the connecting member resist tensile force
On the other hand, structure that does not shrink or bend to resist compressive force
A crane boom suspension structure.