JPH06234389A - Longitudinal member penetration part structure in ship - Google Patents

Abstract

PURPOSE:To provide longitudinal member penetration part structuring allowing field mandays to be reduced by a large margin by improving the shape of an open type slot opened to a part where a longitudinal member penetrates a main frame, a bulkhead, or the like so as to relax the stress of the slot hole edge part, thereby disusing a stifferner heretofore in need. CONSTITUTION:This open-type slot structure is opened to a main frame, a bulkhead 4, or the like in such a way as to surround a web 1 and a face plate 2 in an inverted L-shape when a longitudinal member consisting of the web 1 and the face plate 2 passes through the main frame, bulkhead 4 or the like. In this case, the shape of a slot 5 toward the web 1 side from the vicinity of the level of the face plate 2 on the closed side of the slot 5 is formed into approximately elliptic shape with a major axis P inclined in such a way as to intersect the web 1, and the lower end part of the slot 5 has fixed gouging depth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stiffener (hereinafter referred to as "longe") composed of a web and a face plate, such as a longitudinal member guided in the longitudinal direction of a hull, to prevent large bones, bulkheads, etc. The present invention relates to a structure of a penetrating portion of a penetrating portion, and more particularly, to improvement of an open type slot shape having a hole in the penetrating portion.

[0002]

2. Description of the Related Art A hull structure of a ship is shown in FIG. 5, which is a horizontal cross-sectional view of the center of the hull (left and right side symmetry). For example, in the hull portion of a bulk carrier of the hull, an upper deck 9, a side shell 10 and a bottom shell 3 A cross-sectional shape is formed, and a longitudinal partition wall 11 that divides the hull diagonally is extended in the ship length direction. In addition, in the ship length direction, the large bones (webs, transformers) 4 and ship barges that are shown in the figure are partitioned back and forth. Partition walls and the like (not shown) are arranged at regular intervals. Then, the deck longe L ₁ is on the upper deck 9, the side longe L ₂ is on the side shell 10, the bottom longon L is on the bottom shell 3, and the side longe L ₃ is also on the longitudinal bulkhead 11, passing through each major bone 4 in the ship length direction. And extends along with the longitudinal partition wall 11 and the like to form a longitudinal strength member of the hull. In addition, 8 shows an inner bottom plate.

FIG. 6 shows a typical example of a T-type Bottomlongie L through-hole structure among the through-hole structures in the large bones, non-watertight bulkheads, etc. of these longies (hereinafter collectively referred to simply as "large bones"). As a result, a perspective view of a main part thereof is shown. Below, deck longe L _{1 side} longe L ₂ , L ₃ ,
Botmuronge L and the like are collectively referred to simply as Ronge L. That is, in FIG. 6, a longe L composed of the web 1 and the face plate 2 is provided so as to penetrate through the longe penetration portion of the large bone 4 standingly provided on the bottom plate 3 of the ship. In particular, a stiffener 7 is provided on the face plate 2 of the longe L for smoothly transmitting the load from the bottom plate 3 of the ship to the large bone 4 via the longe L. Examples of this type of prior art include, for example, JP-A-51-20390 and Japanese Utility Model Publication No. 1-1411.
There are 93 and Japanese Utility Model Laid-Open No. 2-40696.

FIG. 7 (a) is a front view showing a general slot shape of a longe penetration portion disclosed in Japanese Utility Model Laid-Open No. 1-141193. An inverted L-shaped slot 5 that surrounds the face plate 2 and the web 1 of the longe L is opened in the large bone 4 of the longe penetration portion. This slot 5 is a so-called open type slot. The left side of the figure with the longiweb 1 in between is called the closed side, and it is composed of straight lines and arcs surrounding the face plate 2, and the right side is called the open side. This is a type in which a linear slot is opened from the face plate 2 to the web 1 in parallel with the web 1 to the outer plate 3. A semicircular scallop 6 may be opened in the welded portion of the web 1 and the outer plate 3. These slots 5 are provided to enable the penetration of the longe L and the like. In addition to the above open type, there is a slit type slot shown in FIG. 7 (b) as the structure of the penetrating portion.

[0005]

In the case of the open type slot shown in FIG. 7 (a), the stress distribution (dotted line) shown in FIG. 3 (a) is exhibited, and at the hole edge 5a of the slot 5, the web 1 As the stress increases at a position G orthogonal to, the stress at the hole edge of the arc portion F having a small radius of curvature near the level of the face plate 2 also increases, and so-called stress concentration occurs here. This is because when the load from the bottom of the ship is transmitted to the large bone 4 via the longe L, the flow of the load (indicated by an arrow) is not smooth (especially in the case of an open type slot, the load is large on the right side of the web 1). This tendency is remarkable because there is no flow of the load transmitted to the bone 4), and it is considered that this occurs because the portion where the web 1 and the large bone 4 intersect is not in a soft shape.

Therefore, conventionally, a stiffener 7 as shown in FIG. 6 is provided in order to reduce the stress concentration in such a slot portion. That is, the lower end of the stiffener 7 is welded to the face plate 2 of the longe L, and the side end thereof is welded to the large bone 4. The stiffener 7 transmits a part of the load acting on the longe L to the large bone 4 through the stiffener 7 as indicated by an arrow to relieve the stress concentration at the slot hole edge. This stiffener 7 can be attached to the large bone 4 side in advance by automatic welding in the stage of small assembly, but the face plate 2 side of the longe L is inserted one by one by the site worker after inserting the longe because of the work surface. They are attached by welding, and the number of them is very large for the entire ship, which requires enormous man-hours.

However, since the stiffener 7 is provided, the stress distribution of the longe L has a bad result as shown in FIG. 4 (a). That is, regarding the stress of the longe L, the stress due to bending is the largest at the place of the large bone 4 supporting the longe L, and the stiffener 7 is attached to the place where this stress is the highest. 2 at the foot of 7
Stress concentration is occurring in some places. Therefore, many examples of damage to this part have been reported conventionally.

The stiffener 7 thus provided for alleviating the stress concentration in the slot portion causes the accident of damage to the longe L and the stiffener 7, and the stiffener 7 crosses the center of the hull in FIG. As shown in the figure, since the number of ships is extremely large, this welding work requires a huge number of on-site man-hours.

In view of the above situation, an object of the present invention is to improve the shape of an open type slot so as to alleviate the stress concentration at the hole edge portion and eliminate the stiffener which has been conventionally required. , To provide a longe penetration structure that enables a significant reduction in on-site man-hours.

[0010]

In order to achieve the above-mentioned object, a longe penetration part structure in a ship according to the present invention has a web and a face plate when the longe consisting of the web and the face plate penetrates a large bone, a partition wall or the like. In an open type slot structure in which the large bones, partition walls, etc. are opened so as to surround the face in an inverted L shape, the shape of the slot from the vicinity of the level of the face plate toward the web side on the closed side of the slot is changed to the web side. It is characterized in that it is formed in a substantially elliptical shape having a slanted long axis that intersects with, and that the lower end portion of the slot has a constant gouging depth.

[0011]

[Operation] In the above open type slot structure,
Part of the load is directly transmitted to the large bones, the partition wall, etc. on the close side via the longe. At that time, the shape of the slot on the close side exhibits a gentle curved hole edge (arc shape with a large radius of curvature) from the vicinity of the level of the longe's face plate toward the web side, and has an inclined long axis intersecting the web. The elliptical shape relieves stress concentration here. Moreover, since the lower end portion of the slot has a shape like a circular arc, the large bone is connected to the web of the longe in a soft shape, and the stress concentration here is reduced.

Since the stress concentration at the edge of the slot hole is relaxed, the stiffener, which has been conventionally required, can be eliminated. As a result, the face plate portion of the longe becomes a smooth surface without welding beads, and the stress concentration here is also eliminated. The load acting on the longe is smoothly transmitted to the large bones and the like.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a through-hole structure of a T-bottomronj as a typical example. The figure is a front view of a main portion of the through-hole, and a thick solid line portion shows a hole edge shape of a slot. In the figure, a longe L is composed of a web 1 erected on an outer plate 3 and the like, and a face plate 2 horizontally fixed to the web 1. Although this figure exemplifies the T-type longe, it can be similarly applied to the L-type longe. Where the longe L penetrates the large bone 4, an inverted L-shaped open type slot 5 is opened so as to surround the longe L. 5
a indicates the hole edge of the slot 5. As shown in the figure, the shape of the open type slot 5 is composed of a straight line portion A, a circular arc portion B, an elliptical portion C and a straight line portion D on the closed side.
That is, the A portion just above the face plate 2 is formed in a linear shape in a range slightly larger than the width of the face plate 2, and the B portion following the A portion is formed in an arc shape up to near the level of the face plate 2. The portion C continuing from the vicinity of the level of the face plate 2 downward (on the side of the web 1) has an elliptical shape (a part of the ellipse shown by the dotted line in the figure) having a long axis P inclined so as to intersect the web 1. Formed,
The D portion of the joining portion that intersects with the web 1 is formed in a slightly straight portion that is orthogonal to the web. In addition, when the size of the D portion is increased, the lower portion (from the D portion to the lower end portion C ₁
The shape of the slot (to
It may be an arc. The inclination angle θ of the ellipse major axis P depends on the size of the longe, but is 10 with respect to the web.
It is set in the range of 30 ° to 30 °, and usually about 15 ° to 20 ° is suitable. It is clear from the analysis results that the effect of relaxing the stress concentration is small regardless of whether the inclination is too large or small. This is considered to be because the flow of stress from the web 1 to the large bone 4 becomes smooth in this angle range.

On the other hand, the open side of the slot 5 on the right side is composed of a straight line portion A, a circular arc portion B (symmetrical up to this point), and a straight line portion H parallel to the web 1, and the foot of the slot 5 intersects the outer plate 3 in a straight line. Alternatively, a so-called soft toe such as a toe (consisting of a circular arc portion and a vertical portion) 6A protruding inward as shown in FIG. Reference numeral 6 is a semicircular scallop that is provided at the intersection of the web 1 and the outer plate 3.

The reason why the C portion on the slot close side is an elliptical hole edge having an oblique long axis P intersecting with the web 1 is that the portion C ₂ (face plate) most related to stress concentration is the first. This is to make (around the level 2) a gentle curve with a large radius of curvature. In particular, the reason why the elliptical hole edge in which the major axis P of the ellipse is inclined so as to intersect the web 1 is that the present invention is directed to the open type slot. That is, in the so-called slit type (see Fig. 7 (b)) that holds both sides of the longiweb and the open type as in Fig. 1, the load from the outer plate (bottom plate) 3 and the longiweb 1 is a large bone (transweb). Four
The reason is that the load transmission procedure is different from the one that is transmitted to only one side. In the case of the open type slot, the longe L is deformed so as to fall toward the grasped side (close side). As described above, since the flow of stress is different, if the conventional stiffener 7 (FIG. 6) is eliminated, if an elliptical slot in which the major axis P of the ellipse is parallel to the web 1 is simply used, the stress of the conventional stress is reduced. This is because the effect of alleviating concentration (see Figure 3 (a)) is small. In other words, this is to reduce the stress to the same level as the conventional type (FIG. 6) provided with the stiffener 7.
Secondly, focusing on the fact that the lower end portion C _{1 of the} edge of the elliptical hole has little relation to the stress concentration due to the vertical force acting in the plane of the large bone 4, This is because the connecting portion between the longe L and the large bone 4 is formed in a soft shape (to reduce stress concentration) as a downwardly protruding (cutout) shape. In this case, the depth (drilling depth) d from the lower end of the face plate 2 to the lower end C ₁ of the elliptical hole depends on the size of the longe L, but is usually about 75 mm, which cannot be extremely deep. . This is because if the cut-out depth d becomes too large, the transmission area of the E portion when the load is transmitted from the longe L to the large bone 4 becomes too small, and the shear stress of the E portion becomes too high. In the case of the slot of this example, as shown in FIG. 3 (b), part of the load applied to the outer plate or the like is directly transmitted to the large bone 4 through the longe L as shown by the arrow, The slot hole edge 5a extending from near the level of the plate 2 to the lower side (on the side of the web 1) is the web 1
Since it has an elliptical shape with a long axis P inclined so as to intersect with, stress flow becomes smooth.

FIG. 2 shows a modified embodiment in which the shape of the slot foot is different from that of FIG. 1, and a semi-elliptical scallop 6B is obliquely opened at the foot of the web 1 and the foot of the slot 5 on the open side is substantially formed. The arc-shaped notch 6C is provided to
It's a toe. Note that when the D portion is made large, the slot below this is not a part of the ellipse,
It may be an arc. Since other configurations are the same as those in FIG. 1, the same configurations are denoted by the same reference numerals as those in the above-mentioned embodiment and the description thereof will be omitted.

Here, a comparison of the stress distribution (shown by the dotted line) between the conventional slot and the slot shape of the present invention (FIG. 1) found by the structural analysis results is shown in FIG. 3, and the longe stress distribution (shown by the dotted line). 4) will be described with reference to FIG. In FIG. 3, (a) shows the stress distribution in the conventional slot portion, and (b) shows the stress distribution in the slot portion of the present invention. As described above, in the conventional slot 5, it is understood that the stress concentration occurs in the arc portion having a small radius of curvature in the F portion, and the stress concentration occurs in the position G orthogonal to the web 1.
Therefore, conventionally, as described above, the stiffener 7 (see FIG. 6) is provided in order to relieve the stress concentration at the hole edge portion of the slot 5.
Had to set up. However, the provision of the stiffener 7 causes a stress concentration in the longe L as described later.

On the other hand, in the slot shape of the present invention shown in FIG. 3 (b), such stress concentration does not occur, and even the arc portion B and the elliptical hole edge portion C exhibit a uniform stress distribution. This is because on the open type slot close side, the arc portion (conventional F portion) where stress concentration is likely to occur is formed by forming an oblique elliptical hole edge at least from near the level of the face plate 2 to the lower web side. It is considered that this is because the flow of stress becomes smooth due to the large curved line, and the load from the longe L is smoothly transmitted to the large bone 4.

Further, stress concentration is not generated even at the intersection of the web 1 and the large bone 4, and the stress is low. This is because the lower end of the slot 5 has a certain hollow depth d. It is considered that the mating portion where the web 1 and the large bone 4 intersect with each other has a soft shape. As a result, if the slot shape of the present invention is adopted, the stiffener 7 (FIG. 6) conventionally required can be eliminated. This means that the man-hours for mounting a huge number of stiffeners can be eliminated, and at the same time the stress concentration in the longe is eliminated and the possibility of damage to the longe is eliminated as described below. Bring

That is, in the stress distribution of Longe, FIG.
In the conventional case where the stiffener 7 is provided as shown in (a), the foot portion of the stiffener 7 (the weld bead portion is not smooth)
It can be seen that stress concentration occurs at two locations. This is because the stiffener 7 is provided at a high stress location of the longe L that intersects with the large bone 4, but rather results in stress concentration, which causes damage to the longe L and cracks in the stiffener 7. It will be easier. On the other hand, in the present invention, since the stress of the slot 5 is reduced as described above, the stiffener which was conventionally required can be eliminated. As a result, as shown in FIG. 4 (b), the face plate 2 of the longe L is smooth. Therefore, no stress concentration occurs and the stress is low.

[0021]

[Effects of the Invention] The open-type closed-side slot shape in the penetration part of the long bone, partition wall, etc.
In addition to the arc shape, by adopting an oblique elliptical shape from the level of the face plate to the web, it is possible to relieve stress concentration in the slot part without the need for stiffeners as in the past, and it is also excellent in strength. The structure can be obtained. With the abolition of stiffeners that were previously required, the number of on-site man-hours can be greatly reduced due to the huge reduction in the number of parts.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a longe penetration portion structure according to an embodiment of the present invention.

FIG. 2 is a front view of a main portion of a longe penetration portion structure according to a modified embodiment of the present invention.

3A and 3B are diagrams for comparing stress distributions of a conventional slot portion and a slot portion of the present invention, where FIG. 3A is a stress distribution diagram of a conventional slot portion, and FIG. The stress distribution map is shown.

4A and 4B are views for comparing stress distributions in the vicinity of the large bone penetrating portion of the conventional longe and the longe of the present invention, where FIG. 4A is a stress distribution diagram of the conventional longe, and FIG. The stress distribution map of Longe is shown.

FIG. 5 is a schematic hull structure diagram in a horizontal cross section (port side) of the center of the hull.

FIG. 6 is a perspective view of a main part showing a conventional structure of a portion where a longe penetrates a large bone.

FIG. 7 is a structural diagram of a conventional longe penetration portion, (a) shows a conventional open type slot, and (b) shows a slit type slot.

[Explanation of symbols]

 L ... Longie 1 ... Web 2 ... Face plate 3 ... Outer plate 4 ... Large bone 5 ... Slot 5a ... Slot edge 7 ... Stiffener P ... (Ellipse) long axis

Claims (1)

[Claims] 1. An open type slot formed in the large bone, the partition wall and the like so as to surround the web and the face plate in an inverted L shape when the longe comprising the web and the face plate penetrates the large bone, the partition wall and the like. In the structure, the shape of the slot from the vicinity of the level of the face plate toward the web on the closed side of the slot is formed into a substantially elliptical shape having a long axis inclined so as to intersect the web, and A longe penetration structure for a ship, wherein the lower end has a certain depth.