JP2002060174A - Structure reinforcing constitution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with adjustment and control of distribution rate of the force during marine transportation structure such as a container crane and to surely reinforce a structure in marine transportation. SOLUTION: Tension bars 20 and 21, which are so formed as to be subjected to the tension when a sea-side leg portion 10 and a land-side leg portion of the container crane are subjected to a prescribed acceleration by the rolling of a ship in marine transportation and not as to be subjected to the tension when the legs are not subjected to the acceleration, are attached to the sea-side leg portion 10 and the land-side leg portion in such a state as diagonally crossing with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a structure reinforcing structure.

[0002]

2. Description of the Related Art Container cranes are installed in harbors for loading and unloading containers from ships. However, this container crane may be relocated to another port depending on circumstances, and at the time of relocation, the container crane is transported by sea by ship. Therefore, at the time of relocation, it is desirable to transport the container crane by sea without disassembling as much as possible in order to shorten the construction period.

FIGS. 9 and 10 show a general container crane. In the drawings, reference numeral 1 denotes a traveling frame capable of traveling on rails laid along a quay, and 2 denotes a traveling frame. An upright frame, 3 is a girder horizontally arranged from the sea side to the land side near the upper end of the traveling frame 1, 4 is a boom supported undulatingly at the sea end of the girder 3, 5 is a girder 3 and a trolley adapted to travel along the boom 4, a spreader 6 suspended from the trolley 5 and adapted to be raised and lowered by a hoisting winch 7,
8 is a container suspended by the spreader 6, and 9 is a ship.

The traveling frame 1 has a sea-side leg 10 and a land-side leg 11, and the sea-side leg 10 and the land-side leg 11 are spaced from each other in the traveling direction as shown in FIG. And a tie beam 14 connecting the upper ends of the leg bodies 12 and 13 and a sill beam 15 connecting the lower ends of the leg bodies 12 and 13, respectively, from the front or back of the container crane. When viewed, it is formed in a rectangular frame shape.

When the container crane is relocated to another port without being disassembled, a temporary rail is laid on a hatch cover on the deck of a vessel for transporting the container crane, and the container crane is lifted by another crane. It is mounted on a temporary rail, and an appropriate position of the traveling frame 1 and the deck are connected by a number of wire ropes so that the container crane does not move on the temporary rail during sea transportation.

Further, as shown in FIG. 11, the seaside leg 10 and the landside leg 11 are respectively provided with leg bodies 12, 1 as reinforcing members.
Tension rods 16 and 17 extending obliquely from the vicinity of the upper end portion 3 to the vicinity of the lower end portions of the leg bodies 13 and 12 are attached so that the middle portions in the longitudinal direction cross when viewed from the sea side or the land side.

[0007] Turnbuckles 18 and 19 provided with a booster mechanism are connected to the tension rods 16 and 17, and by operating the turnbuckles 18 and 19,
The tension rods 16 and 17 can be pre-tensioned in advance.

The reason why the tension rods 16 and 17 are arranged during sea transportation is as follows.

That is, during sea transportation, the waves swing the ship 9 back and forth, left and right, and up and down. As a result, a horizontal force based on acceleration acts on the container crane mounted on the ship 9. For this reason, when the tension rods 16 and 17 are not provided, a moment based on the horizontal force acts on the sea-side leg 10 and the land-side leg 11, and the vicinity of the connection between the leg body 12 and the tie beam 14 and the sill beam 15 and Leg body 13
A large stress exceeding the allowable stress of the material is generated in the vicinity of the connection between the tie beam 14 and the sill beam 15, and the seaside leg 10
In addition, there is a possibility that the land side leg 11 may be damaged.

Therefore, as described above, the tension rod 1
6 and 17, and a part of the force acting on the sea-side leg 10 and the land-side leg 11 is used as tension to make the tension rod 16,
17 to prevent the above situation from occurring.

Although not shown, wire ropes may be used as reinforcing members instead of the tension rods 16 and 17 in some cases.

[0012]

When the tension rods 16 and 17 are used as reinforcing members, the turnbuckles 18 and 19 are narrowed to reduce the tension acting on the tension rods 16 and 17 based on the horizontal force. By adjusting the size, the tension rods 16, 17, the leg body 12,
13, the tie beam 14, and the sill beam 15 can be adjusted in sharing ratio. However, if the tightening is excessive, the tension rods 16 and 17 may be subjected to a stress greater than the allowable stress due to the swinging of the ship 9, There is a possibility that the tension rods 16 and 17 may be damaged.

If the turnbuckles 18 and 19 are not sufficiently tightened, the share of the force borne by the tension rods 16 and 17 is insufficient, and the seaside leg 10 and the land side leg 11 are reinforced. Can not play a role. Therefore, it is difficult to adjust and manage the share ratio of the force to the tension rods 16 and 17.

Further, when a wire rope is used as the reinforcing member, the elongation gradually progresses with the passage of time, and the force sharing ratio cannot be kept constant, so that the reliability as the reinforcing member is deteriorated. , Handling is difficult due to the large diameter.

Further, the reinforcing members are tension rods 16,
In both the case 17 and the wire rope, whether or not the container crane can be protected during marine transportation depends on the adjustment of the reinforcing member, and therefore, insufficient adjustment easily leads to an accident. Also, under the condition that the sea is rough,
It is almost impossible to expect the seafarer to adjust the tension rods 16 and 17 and the wire rope accurately, and thus the effect of reinforcement is small and it is difficult to avoid the possibility of an accident.

In view of the above-mentioned circumstances, the present invention makes it unnecessary to adjust and manage the share of power when transporting a structure such as a container crane by sea, and can reliably reinforce the structure during sea transportation. An object of the present invention is to provide a structure reinforcing structure as described above.

[0017]

According to a first aspect of the present invention, there is provided a structure for reinforcing a structure, wherein a structure mounted on the transportation means receives a predetermined acceleration due to a swing of the transportation means during water transportation, and is displaced by a predetermined amount. Elongated reinforcing means attached to the structure to prevent the tension from being applied when the object is not subjected to a predetermined acceleration and is not displaced by a predetermined amount when the object is pulled and tensioned in a case where it is not displaced by a predetermined amount. It is.

In the structure reinforcing structure according to the second aspect of the present invention, the transportation means is a ship, the structure is a container crane, and the elongated reinforcing means is a front view of a rectangular frame-shaped leg of the container crane. The tension bars are arranged crossing each other.

In the structure reinforcing structure according to the third aspect of the present invention, the elongated reinforcing means is configured to be fastened to the structure at both ends by pins.

In the present invention, when the structure is not subjected to a predetermined acceleration, the elongated reinforcing means is slackened and no tension is applied. However, when the structure is displaced by a predetermined amount under the predetermined acceleration, the elongated reinforcing means is elongated. A tension is applied to the reinforcing means, and a force acting on the structure is partially shared by the elongated reinforcing means.

Therefore, according to the present invention, the share of the force to the elongated reinforcing means can be easily determined, and there is no need to adjust or manage the share of the force during the water transport. Can be reliably reinforced. For this reason, there is no danger of the structure being damaged, and the structure is simple, which is economically advantageous. Further, since the structure is fastened to the structure by the pins, the structure can be easily attached to and detached from the structure. it can.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 8 show an example of an embodiment of the present invention. In the drawings, the components denoted by the same reference numerals as those shown in FIGS. 9 to 11 represent the same components. or,
FIG. 9 shows a structure of a container crane to which the present invention is applied.
11 to FIG.

In FIGS. 1 and 2, reference numeral 20 denotes a reinforcing member for connecting the vicinity of the connection between the leg body 12 and the tie beam 14 of the seaside leg 10 or the land side leg 11 and the vicinity of the connection between the leg body 13 and the sill beam 15. The tension bar 21 is provided diagonally as shown in the figure, and 21 is a leg body 13 of the sea-side leg 10 or the land-side leg 11.
And a connection bar between the tie beam 14 and the connection between the leg body 12 and the sill beam 15.
Each of the reference numerals 0 and 21 is configured to cross at a middle portion in the longitudinal direction when viewed from the sea or the land.

The tension bars 20 and 21 have the same structure, and as shown in FIGS. 3 and 4, an upper bar body 22 and a lower bar body 23 in the form of a square pipe arranged in series, and an upper bar body 22 and a lower bar body. A flat bar-shaped connecting member 24 for connecting the main body 23 is provided, and a pin hole 25 is formed at an upper end of the upper bar main body 22 so that an axis is directed in a longitudinal direction of the girder 3 (see FIG. 9). A forked bracket 26 is fixedly provided, and a forked bracket 28 having a pin hole 27 whose axis is parallel to the pin hole 25 is fixedly provided at the lower end of the lower bar main body 23.

Next, how to determine the lengths of the tension bars 20, 21 will be described with reference to FIGS. That is,
As shown in FIG. 6, when the horizontal force W acts on the center of gravity G of the sea-side leg 10 or the land-side leg 11 without the tension bars 20 and 21 due to the rocking acceleration of the ship, The horizontal displacement of the connection between the leg body 12 and the tie beam 14 is δa1, and the leg bodies 12, 13 and the tie beam 1
4. The maximum stress based on the moment acting on the sill beam 15 is defined as σa1, and the maximum stress σa1 is the allowable stress σa1.
It is assumed that it is larger than o.

Next, as shown in FIG. 7, when the maximum displacement generated in the leg bodies 12, 13, the tie beam 14, and the sill beam 15 by the horizontal force W is defined as an allowable stress σo, the horizontal displacement amount is δa2. Since there is a proportional relationship between the horizontal displacement and the horizontal displacement, [Equation 1] holds.

[0027]

## EQU1 ## δa2 = σo × δa1 / σa1

The length of the diagonal line α connecting the connection position between the leg body 12 and the tie beam 14 and the connection position between the leg body 13 and the sill beam 15 when the horizontal force W does not act and there is no horizontal displacement amount δa2. As shown in FIG. 7, L1, the angle between the diagonal line α and the sill beam 15 and the angle between the diagonal line α and the tie beam 14 are θ, and the horizontal force W acts to generate the horizontal displacement amount δa2. Connection position between leg body 12 and tie beam 14, and leg body 13 and sill beam 15
L2 is the length of the diagonal β connecting the connection position with the connection point, and a perpendicular γ is drawn from the intersection of the leg body 12 and the tie beam 14 to the diagonal β when no horizontal force is applied, Assuming that the length to the tip of the horizontal displacement δa2 when the force W is applied is X and the angle between the diagonal lines α and β is θθ, θ ′ = θ− 、 θ, the length X is [ Equation 2]
Is represented by

[0029]

X = δa2 × cos θ ′

However, since .DELTA..theta. Is a small angle, there is practically no problem even if .theta. =. Theta. '. Therefore, [Equation 2] becomes [Equation 3].

[0031]

X = δa2 × cos θ

When the horizontal displacement W causes a horizontal displacement δa2 in the sea-side leg portion 10 and the land-side leg portion 11 with the tension bar 20 attached, the tension bar 20 itself also exerts a stress. Displaced in the longitudinal direction to bear. Assuming that the displacement of the tension bar 20 at this time is ΔX, [Equation 4] holds. In [Equation 4], E is the Young's modulus.

[0033]

４X = σo × (L1 / E)

Accordingly, the length L2 of the tension bar 20 to be manufactured is represented by [Equation 5].

[0035]

L2 = L1 + X− △ X = L1 + δa2 × cosθ−σo × (L1 / E) = L1 (1−σo / E) + δa2 × cosθ

That is, the actual length L2 between the pin holes 25 and 27 of the tension bar 20 is made longer than the length L1 of the diagonal line α when no horizontal force is applied.
Install in a loose state as shown in.

Next, a procedure for attaching the tension bar 20 having the length L2 determined by [Equation 5] to the sea-side leg 10 or the land-side leg 11 will be described with reference to FIG.

First, as shown in FIGS.
Is welded to both side surfaces of the lower bar body 23 at the factory, and the upper bar body 22 is inserted between the two connecting members 24 so as to be able to adjust the position in the longitudinal direction. Attach to the part 10 or the land side leg part 11.

That is, for example, the bracket 29 is welded near the connection between the leg body 12 and the tie beam 14, and the bracket 30 is welded near the connection between the leg body 13 and the sill beam 15.

The pin hole 25 of the bracket 26 attached to the upper part of the tension bar 20 is aligned with the pin hole of the bracket 29, and the pin is inserted to connect the upper bar body 22 to the bracket 29. The lower bar main body 23 is connected to the bracket 29 by aligning the pin holes 27 of the attached bracket 28 with the pin holes of the bracket 30 and inserting the pins.

At appropriate stages, brackets 31 and 32 are welded near the opposing portions of the upper bar main body 22 and the lower bar main body 23 as shown in FIG. 5, and a hydraulic jack 33 is set between the brackets 31 and 32. In advance, tension bar 2
0 is attached to brackets 29, 30 fixedly mounted on the sea-side leg 10 and the land-side leg 11, respectively.
Is actuated to extend. For this reason, the upper bar main body 22 and the lower bar main body 23 of the tension bar 20 extend in proportion to the force. As a result, when the pre-formed marking on the connecting member 24 matches the lower end of the upper bar main body 22, The bar body 22 and the connection member 24 are welded. For this reason, the length between the pin holes 25 and 27 of the tension bar 20 becomes L2 as shown in [Equation 5], and becomes slack as shown in FIG.

The attachment of the tension bar 21 to the sea-side leg 10 and the land-side leg 11 is performed in the same manner as in the case of the tension bar 20.

Therefore, even if acceleration occurs due to shaking of the ship when the container crane is mounted on the ship and transported by sea, if the acceleration is small, the connection between the leg body 12 and the tie beam 14 or Leg body 13 and tie beam 14
The horizontal displacement of the connection part is small, and the tension bar 2
0 and 21 remain slack, and the stress of each member is equal to or less than the allowable stress.

However, when the acceleration caused by the waves reaches a predetermined magnitude and the container crane receives a large force, first, the connection between the leg body 12 and the tie beam 14 or the leg body 13 and the tie beam 14 Is displaced in the horizontal direction, and the displacement in the horizontal direction becomes δa2. Then,
The tension bars 20 and 21 are pulled and act on tension,
Part of the horizontal force is shared by the tension bars 20 and 21,
Supported. In this case, a stress of σo which is substantially equal to the maximum allowable stress is generated in the leg bodies 12 and 13, the tie beam 14, the sill beam 15 and the tension bars 20 and 21.

As described above, the tension is applied to the tension bars 20 and 21 when a predetermined acceleration acts on the container crane due to the wave swinging the ship, so that the force sharing ratio can be easily determined. There is no need to adjust or manage power sharing during marine transport. For this reason, the container crane can be reliably reinforced during sea transportation, and there is no possibility that the container crane will be damaged.

The tension bars 20, 21 are economically advantageous because of their simple structure, and can be easily attached and detached because they are fastened using pins.

In the illustrated example of the present invention, the case where the tension bar is provided on the sea-side leg and the land-side leg of the container crane has been described. However, the present invention can be applied not only to the container crane but also to various structures. Of course, the water transportation is not limited to sea transportation, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0048]

As described above, the first aspect of the present invention is as described above.
According to the structural reinforcement structures described in (1) to (3), I) the power sharing ratio can be easily determined, and there is no need to adjust or manage the power sharing ratio during water transport.
The structure can be reliably reinforced during transportation, and there is no risk of damage to the structure. II) The structure is simple and therefore economically advantageous. III) The structure can be easily attached and detached. Various excellent effects can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a tension bar attached to a seaside leg of a container crane, which is an example of a structure reinforcing structure of the present invention.

FIG. 2 is a front view of a tension bar attached to a land-side leg of a container crane, which is an example of the structure reinforcing structure of the present invention.

FIG. 3 is a detailed view of the tension bar shown in FIGS.

4 is a view in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a detailed view showing a state where the tension bar is extended when the tension bar is attached to a sea-side leg or a land-side leg.

FIG. 6 is a schematic diagram for explaining the principle of determining the length of a tension bar.

FIG. 7 is a schematic diagram for explaining the principle of determining the length of a tension bar.

FIG. 8 is a schematic view showing a tension bar having an increased length attached to a sea-side leg or a land-side leg in a loosened state.

FIG. 9 is a front view showing an outline of a general container crane.

FIG. 10 is a view as viewed in the direction of arrows XX in FIG. 9;

FIG. 11 is a front view of a conventional tension rod attached to a sea-side leg or a land-side leg.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sea-side leg (structure) 11 Land-side leg (structure) 20 Tension bar (elongated reinforcing means) 21 Tension bar (elongated reinforcing means)

Claims (3)

[Claims] When a structure mounted on a transportation means receives a predetermined acceleration and is displaced by a predetermined amount due to shaking of the transportation means during water transportation, the structure is pulled and tensioned and receives a predetermined acceleration. The structure reinforcing structure is characterized in that elongated reinforcing means for preventing the tension from being slackened when not displaced by a predetermined amount is attached to the structure. 2. The transportation means is a ship, the structure is a container crane, and the elongated reinforcing means is a tension bar disposed on a rectangular frame-shaped leg of the container crane so as to cross each other in a front view. The structure reinforcing structure according to claim 1. 3. The structure reinforcing structure according to claim 1, wherein the elongated reinforcing means is fastened to the structure at both ends by pins.