JPH0720064Y2 - Roofboard structure of a maritime container with heat insulation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a roof structure for a marine container having a heat insulating structure.

(Prior Art) Conventionally, in a marine container having a heat insulating structure (hereinafter simply referred to as a marine container), its roof structure is, as shown in FIGS. 4 and 5, between the side frame members 4, 4 above the marine container. A flat roof plate 2 and a lining plate 3 are stretched on the upper and lower surfaces of a joist 1 provided at appropriate intervals in the width direction, and a heat insulation is provided in a space between the roof plate 2 and the lining plate 3. The material 5 was filled. The sea container with such a structure is loaded with cargo and is loaded and unloaded from land to ship or from ship to land using a container crane.

The marine container is hoisted or hung by the metal fittings 6 (Fig. 6) at its four corners engaging the tightening claws 8 of the spreader 7 of the container crane (Fig. 6). At this time, the sea container has a large deflection δ (7th
(Fig.) Has occurred, and the entire roof has been compressed. Therefore, a compressive load acts on the outer roof plate 2 and the lining plate 3, and the entire length of the roof plate 2 and the lining plate 3 is forcibly contracted by the compressive force, and the roof plate 2 and the lining plate 3 buckle. Although it acts as a force that causes a phenomenon, in the initial state, the generation is prevented by the adhesive force with the heat insulating material layer. However, since the maritime container is repeatedly used for a long period of time, when the compressive load is repeatedly applied during loading and unloading, the roof plate 2 and the lining plate 3 and the heat insulating material 5 are separated at first, and further progresses. Then, the buckling of the roof 2 and the lining board 3 occurs across the width of the roof, and eventually the tip of the buckling part cracks, which allows rainwater to enter the inside of the roof board and reduces the heat insulating effect. There was a problem. By such buckling of the inner and outer panels of the roof,
There was also an inherent problem of drastically reducing the product value of marine containers.

(Problems to be Solved by the Invention) The present invention has been devised in view of the above-mentioned problems of the prior art, and the roof plate 2 and the lining plate 3 during the loading and unloading of a marine container.
It is an object of the present invention to provide a roof structure capable of preventing the occurrence of buckling due to the repeated compressive load that occurs in the roof as much as possible.

(Means for Solving the Problem) In a roof structure of a marine container having corner metal fittings above and below four corners and forming a heat insulating material layer between the roof board and the lining board, the roof board 2 and the lining board 3 A plurality of widthwise recessed strips are provided at predetermined intervals over the lengthwise direction of the sea container, and a recessed strip 9 provided on the roof plate 2 side and a recessed strip 9a provided on the lining plate 3 side respectively form the center of the heat insulating material layer. I set it up to face.

In addition, the width-direction concave lines are densely roughened near the front and rear ends in the longitudinal center of the sea container.

(Operation) The roof is bent by the lifting of the container, and the outer roof plate 2
And the inner lining plate 3 is also compressed. At this time, the buckling force due to the compressive load can be absorbed by the recessed line 9 provided in the roof plate 2, and the buckling force due to the compressive load can be absorbed by the recessed line 9a in the lining plate 3.

In addition, the central part is made dense so that the buckling force in the part that is the most flexible and easily damaged is better absorbed.

(Example) FIG. 1 is an inclined view of a marine container to which the present invention is applied.
The roof board 2 has widthwise recessed lines 9 at predetermined intervals in the front-rear direction.
Is provided. As shown in FIG. 1, the groove 9 is used for the roof plate 2
Although it is not shown in the drawing, it may be provided so as to fill the width direction of the sea container, or it may be provided with a margin for attaching the upper side frame member 4 of the marine container to the side portion. The shape may be intermittent in the direction.

In the case of FIG. 1, since the recessed strip 9 reaches the end edge of the roof plate 2, the side frame member 4 can be mounted on the upper side frame member 4.
Press the mounting part to be flat and then mount. In the example of the drawing, the edge of the roof plate 2 is attached to the side frame member 4 as shown in FIG.
The flange is wrapped around to ensure perfect rain. The lining plate 3 is also provided with the recessed strip 9a similarly to the roofing plate 2, and both the recessed strip 9 on the roof plate side and the recessed strip 9a on the lining side are heat insulating materials when viewed in cross section as shown in FIG. It has side edges that slope towards the center of the layer.

In addition, the flexure δ that occurs when the sea container is lifted (7th
(Fig.) Is the largest in the center of the sea container, so
The positions where 9a and 9a are provided may be gradually increased in the front-rear direction from the longitudinal center of the marine container.

The roof plate with the groove 9 will be described in more detail below. The recesses 9 and 9a are pressed into a mountain-shaped cross section at a predetermined pitch (Fig. 3). When the roof plate 2 is attached to the side plate member 4, the peripheral edge portion in the width direction of the roof plate 2 is flattened and pressed back and attached to the flange 4a of the side frame member 4 as shown in FIG. In addition, in the heat insulating roof structure, since the joist 1 is provided between the roof board 2 and the lining board 3 in the width direction at an appropriate interval (for example, about 600 mm interval), the concave strip avoids this joist 1 part. Is provided. The lining plate 3 is also provided with the recessed line 9a similarly to the roof plate 2. The depths of the recesses 9 and 9a are shallower than the thickness of the heat insulating layer, and FIGS. 3 and 8 are exaggerated. However, the depth is appropriately selected depending on the size of the marine container, the thickness of the roof plate and the lining plate, and the like.

With the roof structure as described above, the recessed line 9 absorbs the compressive load applied to the roof plate 2 generated when the sea container is lifted, and the compressive load applied to the lining plate 3 faces the center of the heat insulating material layer. The groove 9a absorbs. In other words, the recess 9 on the side of the roof plate 2 and the recess 9a on the side of the lining plate 3 are provided so as to face each other toward the center of the heat insulating material layer. The component forces c'and c "of the compressive force c (Fig. 8) act on 3 in order to press the heat insulating material along the concave line, so that the heat insulating material 5 is separated from the roof plate 2 and the lining board 3. Will be prevented.

In addition, when the pitch of the recessed lines is provided in the width direction, it may be corrugated uniformly at a constant pitch, or may be a corrugated pitch in which the central portion is densely roughened at both ends.

(Effect) Since the concave strips 9 and 9a are provided on the roof plate and the lining plate of the marine container at appropriate intervals so as to face the center of the heat insulating material layer, they act on the roof plate and the lining plate generated by lifting the sea container. The buckling force caused by the compressive load can be absorbed by the presence of these recessed strips 9 and 9a, and the occurrence of damage due to the buckling phenomenon of the roof plate or the lining plate can be prevented.

Further, since both the roof plate and the lining plate are provided with the concave stripes that face the center of the heat insulating material layer, the bonding area between the roof plate and the heat insulating material that is in close contact therewith is increased, and the roof plate and the heat insulating material The peeling phenomenon can also be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a marine container to which the present invention is applied. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is a sectional view corresponding to FIG. 2 showing a conventional structure. FIG. 5 is a longitudinal cross-sectional view of a marine container showing a conventional structure. FIG. 6 is a diagram showing a method of loading and unloading a marine container. FIG. 7 is an explanatory view of a bent state when the sea container is lifted. FIG. 8 is an explanatory diagram of a load state in the concave portion. In the figure; 1 ... joist, 2 ... roofing board 3 ... lining board, 4 ... side frame material, 5 ... heat insulating material, 6 ... corner metal fitting, 7 ... spreader, 8 ... tightening claw 9, 9a ... recessed line

Claims (2)

[Scope of utility model registration request] 1. A roof structure for a marine container having corner fittings above and below four corners and having a heat insulating material layer formed between the roof plate and the lining plate, wherein the roof plate (2) and the lining plate (3) are provided. A plurality of widthwise concave lines are provided at predetermined intervals over the longitudinal direction of the sea container, and a concave line (9) provided on the roof plate (2) side and a concave line (9a) provided on the lining plate (3) side. The roof structure of the maritime container has a heat insulating structure, in which each is oriented toward the center of the heat insulating material layer. 2. The roof structure of a marine container provided with a heat insulating structure according to claim 1, wherein the widthwise recesses are densely and roughly roughened in the longitudinal center of the marine container toward the front and rear ends.