JP5707701B2 - Bow mask and ship with bow mask - Google Patents

Description

  The present invention relates to a bow mask attached to a ship having a constriction between a tip of a hull and a bow valve, and a ship to which the bow mask is attached.

In a large-sized ship, since the degree of enlargement of the entire bow is large, the size of the thickness of the bow water line has little effect on wave resistance in plain water. For this reason, as shown in FIG. 13 (a), the bow waterline portion 101 in the conventional enlarged ship 100 has a mainstream shape such that its horizontal section draws a large arc as shown in FIG. 13 (b). .
However, in addition to wave-making resistance caused by waves generated during propulsion, the ship has an increase in resistance in the waves.
Ships with such a large bowline have a large increase in resistance in waves, and in particular, there is a large increase in resistance even in waves with short wavelengths that were generally considered to have a small increase in resistance in waves. Has become clear in recent years. FIG. 14 is a test result showing an increase in resistance in waves. The broken line portion in FIG. 14 is an increase in resistance in waves with a short wavelength. This is resistance due to a reflected wave in which a wave hitting the bow is bounced back in front of the hull.
By the way, the following structure is proposed regarding the bow structure.
In Patent Document 1, a tapered rectifier is provided at the bow in order to reduce wave resistance.
Patent Documents 2, 3, 4, and 5 propose a bow structure for the purpose of reducing resistance by reflected waves.

A microfilm (issued by the Japan Patent Office on June 24, 1981) that photographed the specification and drawings attached to the application of the actual application No. 54-160405 (No. 56-77495). A microfilm (issued by the Japan Patent Office on August 3, 1993) in which the description and drawings attached to the application for the actual application No. 5-58591 (Japanese Utility Model Application No. 5-58591) were taken. JP-A-8-142974 JP 2003-327193 A Japanese Patent Laid-Open No. 2004-314943

As a countermeasure for reducing the resistance due to the reflected wave, as shown in FIG. 15, a hull form in which the bow end 102 of the enlarged ship 100 is extended to reduce the degree of enlargement of the bow water line is effective.
However, in the hull form shown in FIG. 15, since the portion having the drainage amount of the ship becomes long, the structural length that is the basis of the structural design becomes long. As a result, it is necessary to increase the structural strength of the entire hull, and the hull weight increases. . As a result, the cargo loading capacity of the ship is reduced, and at the same time, the construction cost is increased, and the transportation efficiency is deteriorated.
In order to solve this, it is preferable not to constitute a watertight compartment between the bow mask and the main hull so that the bow mask for reducing the enlargement of the bow water line does not have a drainage amount. It is effective to make the structure excluded from the range of the structure length.
Incidentally, the configuration proposed in Patent Document 1 is not sufficient as a measure for reducing resistance due to reflected waves. That is, in patent document 1, it has the structure where the rectifier and the bow are vacant, and the rectifier protrudes ahead rather than the bow valve. Since this ship has a structure with no constriction at the bow, when it shakes in the waves, the wave may hit over the rectifier due to the up and down movement of the bow, or conversely from below the rectifier, A reflected wave is generated between the rectifier and the bow. In addition, the rectifying body receives an impact from above and below due to the up and down swing of the bow, which is a serious problem. Moreover, by providing a large number of through-holes in the rectifying body, inflow and outflow of seawater occurs even in a calm sea area without waves, and resistance increases. In addition, since there is a large gap with a step between the end and the hull, a vortex is generated in this gap and it becomes resistance during navigation.
Patent Document 2 proposes a bow appendage for connecting the upper end of the bow valve and the bow upper portion (second embodiment shown in FIGS. 7 to 9). Even if there is up and down shaking, resistance due to reflected waves can be reduced. However, as described in Patent Document 2, this bow appendage is not sufficient as a measure for reducing the resistance due to the reflected wave, although it eliminates the reflection of the wave forward. That is, as shown in FIG. 16, a phenomenon occurs in which the wave a deflected on the side surface of the bow appendage 103 and the wave b reflected by the bow 104 collide with each other. End up. The resistance caused by the collision between the reflected waves has a large effect when the propulsion direction and the wave direction do not coincide even when the wave from the front does not have a large effect. . Since the number of cases in which the propulsion direction and the wave direction coincide with each other in a navigating ship, the influence of resistance due to the collision of the reflected waves is large.
In Patent Documents 3 and 4, as shown in FIG. 17, a phenomenon occurs in which the wave a deflected on the side surface of the bow appendage 103 and the wave b reflected on the bow 104 collide with each other. I will receive resistance from the collision. Therefore, it cannot be said to be sufficient as a measure for reducing the resistance due to the reflected wave.
Patent Document 5 proposes a reflected wave reducing structure that connects the upper end of the bow valve and the upper bow (third embodiment shown in FIGS. 8 to 13), and this reflected wave reducing structure. According to the object, the resistance due to the reflected wave can be reduced even when the bow moves up and down. However, in Patent Document 5, as shown in FIGS. 11 and 13, the reflected wave reducing structure 12B has a concave shape on the outer side. Therefore, on the side surface of the reflected wave reducing structure 12B like a parabolic antenna. The location where the deflected waves are concentrated occurs, and resistance is generated by the collision of the waves. In addition, it is not clear whether a watertight section is formed between the hull and the hull, and if it is a solid structure, a problem of an increase in hull structure weight occurs. Also, there is no disclosure about the attachment of the reflected wave reducing structure to the hull.

Accordingly, the present invention provides a bow mask that can suppress an increase in the hull structure weight while reducing an increase in wave resistance by adding a structure that has almost no drainage separately from the hull to the bow end. The purpose is to do.
Another object of the present invention is to provide a ship with a bow mask in which the bow mask is attached to the hull.

In the bow mask according to claim 1, the bow mask front end portion set so as not to protrude forward of the front end line connecting the tip and the front portion of the bow valve, and from the front end line to the left and right ship side skins of the hull Consists of a pair of bow mask side plates arranged along the drawn tangent line and a support structure that supports the bow mask side plate by attaching it to the hull. An upper opening is formed in the upper portion of the bow mask side plate, and a lower portion of the bow mask side plate. the together form a lower opening, and characterized in that the position of the bow structure of the attachment position of the hull supporting region structure, such as a horizontal structure provided inside the hull of the ship body To do. According to the first aspect of the present invention, the front end portion of the bow mask is set so as not to protrude forward of the front end line connecting the tip and the front portion of the bow valve. However, since it does not protrude forward, safety at the time of navigation is high. Further, according to the present invention, the propulsion direction does not coincide with the wave direction by arranging the pair of bow mask side plates along the tangent line drawn from the front end line to the left and right ship side outer plates of the hull. However, since the phenomenon that the reflected waves of the bow mask side plate and the bow portion collide does not occur, the resistance due to the reflected waves can be reliably reduced. Further, according to the present invention, the bow mask side plate is supported on the hull by the support structure, and the upper opening is formed in the upper portion of the bow mask side plate and the lower opening is formed in the lower portion of the bow mask side plate. It does not increase the weight of the hull structure, and the air in the bow mask and the water that has entered are smoothly discharged when sailing in the waves. Further, according to the present invention, the support structure is attached in accordance with the position of the bow structure such as a horizontal structure provided inside the hull outer plate of the hull. The strength against is also high.
In the bow mask according to claim 2, the upper opening is formed as a gap between the bow mask side plate and the hull, and the lower opening is formed as a gap between the bow mask side plate and the bow valve. It is characterized by doing. According to the second aspect of the present invention, when the bow mask is attached to the hull, the upper opening and the lower opening can be formed, and it is not necessary to provide an opening in the bow mask side plate in advance. In addition, by using the gap between the bow mask side plate and the hull and the gap between the bow mask side plate and the bow valve, a certain opening can be reliably formed. Air and incoming water are discharged more smoothly.
According to a third aspect of the present invention, in the bow mask according to the first or second aspect, a gap is formed between the rear end portion of the bow mask side plate and the hull. According to the third aspect of the present invention, a gap is also formed between the rear end portion of the bow mask side plate and the hull so that the air in the bow mask and the water that has entered are discharged during navigation in the waves. Is even smoother.
According to a fourth aspect of the present invention, there is provided the bow mask according to any one of the first to third aspects, wherein the mounting position of the support structure to the hull is a horizontal structure that is one of the bow structure. It is characterized by being a position. According to the fourth aspect of the present invention, the support structure is attached in accordance with the position of the horizontal structure that is one of the bow structures of the hull. The strength against is also high.
According to a fifth aspect of the present invention, in the bow mask according to any one of the first to fourth aspects, the support structure has a mounting portion attached to the hull. According to this invention of Claim 5, attachment to a ship body can be performed easily and reliably by having an attaching part.
According to a sixth aspect of the present invention, in the bow mask according to any one of the first to fifth aspects, the bow mask side plate has an outwardly convex curved surface. The bow mask side plate according to the present invention described in claim 6 has a curved surface that protrudes outward, thereby preventing the bow mask side plate from warping due to the force of waves even if the bow mask side plate is thin. To increase the strength. Moreover, even if the bow mask front end portion is R-shaped, it can be smoothly fitted along the ship side skin by forming a convex curved surface.
In a ship with a bow mask corresponding to claim 7, the bow mask according to any one of claims 1 to 6 is attached. According to the seventh aspect of the present invention, by adding a structure having almost no drainage to the bow end, it is possible to suppress an increase in the hull structure weight while reducing an increase in wave resistance. In addition, since the front end portion of the bow mask does not protrude ahead of the front end line, the safety at the time of navigation is high, and a ship that does not hinder the wave resistance suppressing effect of the bow valve can be realized.
The present invention according to claim 8 is the ship with a bow mask according to claim 7, wherein the support structure is attached to the hull by welding. According to the eighth aspect of the present invention, it is easy to form a gap between the bow mask side plate and the hull and a gap between the bow mask side plate and the bow valve by attaching the support structure to the hull by welding. .

According to the present invention, even if the propulsion direction and the wave direction do not coincide with each other, a phenomenon in which the reflected waves of the bow mask side plate and the bow portion collide with each other does not occur, thereby reliably reducing the resistance due to the reflected wave. be able to. Further, according to the present invention, the structure having the upper opening and the lower opening does not have a drainage amount and does not increase the weight of the hull structure. Further, it is possible to prevent the bow from being pushed up due to the compression of the air accumulated in the upper part due to waves during navigation and the addition of weight due to water entering and staying from the lower part. Furthermore, inspection and maintenance inside the bow mask can be facilitated from the upper opening and the lower opening. Further, according to the present invention, the front end portion of the bow mask does not protrude ahead of the front end line, so the safety at the time of navigation is high, and the effect of suppressing the wave resistance of the bow valve is not hindered. Further, since the support structure is attached in accordance with the position of the bow structure such as a horizontal structure provided inside the hull outer plate of the hull , joining such as welding is easy, and attachment strength and strength against external force are high.
When the upper opening is formed as a gap between the bow mask side plate and the hull and the lower opening is formed as a gap between the bow mask side plate and the bow valve, there is no need to provide an opening in the bow mask side plate in advance. Since a certain opening can be formed with certainty, it is possible to further prevent the bow from being pushed up by the compression of the air accumulated in the upper part due to waves during navigation, and the addition of weight due to water entering and staying from the lower part.
In addition, when a gap is formed between the rear end of the bow mask side plate and the hull, the bow of the bow is pushed up due to compression of the air accumulated in the upper part due to waves during navigation, and water enters and stays from the lower part. The addition of weight due to can be further prevented. In addition, inspection and maintenance inside the bow mask can be facilitated.
Further, when the support structure is attached to the hull at the position of the horizontal structure which is one of the bow structures of the hull, joining such as welding is easy, and attachment strength and strength against external force are high.
Further, when the support structure has an attachment portion attached to the hull, the attachment can be easily and reliably performed.
In addition, when the bow mask side plate has an outwardly convex curved surface, the strength against warpage is increased, the weight is reduced, and the prevention of the occurrence of concentrated spots on the side surface of the bow mask side plate is ensured. It becomes possible to plan. In particular, even if the front end portion of the bow mask is R-shaped, it can smoothly follow the ship side skin.
Further, by attaching a bow mask having almost no drainage to the ship, it is possible to suppress an increase in the hull structure weight while reducing an increase in resistance in waves. In addition, since the front end portion of the bow mask does not protrude ahead of the front end line, the safety at the time of navigation is high, and a ship that does not hinder the wave resistance suppressing effect of the bow valve can be realized.
In addition, when the support structure is attached to the hull by welding, it is easy to form a gap between the bow mask side plate and the hull, or a gap between the bow mask side plate and the bow valve. Installation is also easy .

The principal part perspective view which shows the state of the ship which attached the bow mask by one Embodiment of the bow mask of this invention. The principal part side view of the ship which attached the bow mask by other embodiment of the bow mask of this invention Main part plane sectional drawing by the AA line in FIG. Explanatory drawing of the bow mask The principal part side view of the ship which attached the bow mask by other embodiment of the bow mask of this invention. FIG. 5 is a cross-sectional view of an essential part taken along line AA in FIG. Enlarged view of the main part of FIG. 7 is a perspective view of a round frame portion in FIG. The principal part plane sectional view of the ship which attached the bow mask by other embodiment of the bow mask of the present invention. The principal part side view of the ship which attached the bow mask by other embodiment of the bow mask of this invention. Main part plane sectional drawing by the AA line in FIG. The principal part top side view of the ship which attached the bow mask by other embodiment of the bow mask of this invention. The figure which shows the shape of the conventional enlargement ship Diagram showing test results of resistance increase in waves Hull form diagram showing measures to reduce resistance by reflected waves Explanatory drawing showing a conventional bow appendage Explanatory drawing showing other conventional bow appendages

Below, one Embodiment of the bow mask of this invention is described.
FIG. 1 is a perspective view of a main part of a ship equipped with a bow mask according to the present embodiment.
As shown in FIG. 1, the bow mask 10 according to the present embodiment is attached to a ship having a large bow enlargement in which a constriction 3 is provided between the tip 1 a of the bow 1 and the bow valve 2. Here, the ship having a large bow enlargement corresponds to a low-speed cargo ship represented by a tanker having a horizontal section of the bow 1 having an arc shape and a square manure coefficient Cb of 0.78 or more. The bow mask 10 is arranged on the hull side so as not to protrude forward from a front end line X connecting the tip 1a and the front portion 2a of the bow valve 2. Note that the configuration described in this embodiment is applied to all of the following embodiments.

2 is a side view of an essential part of a ship to which a bow mask according to another embodiment of the bow mask of the present invention is attached. FIG. 3 is a plan sectional view of an essential part of the bow mask taken along line AA in FIG. It is explanatory drawing.
As shown in FIGS. 2 and 3, the bow mask 10 is connected to a pair of bow mask side plates 11 a and 11 b arranged corresponding to the ship side outer plates on the left and right sides of the hull, and a pair of bow mask side plates 11 a and 11 b. It is comprised from the bow mask front-end part 12 and the support structure 13 which supports the neck mask side plates 11a and 11b to a hull.

The bow mask front end portion 12 is disposed along the front end line X, and the bow mask side plates 11a and 11b are disposed along the tangent lines Y and Y 'drawn from the front end line X to the left and right ship side outer plates of the hull. The structure 13 is disposed inside the pair of bow mask side plates 11a and 11b. If the angle difference between the face of the bow mask side plates 11a and 11b and the ship side skin is within 5 degrees, the bow mask front end 12 may be near the rear of the front end line X, and the front end line X of the bow mask front end 12 The rear vicinity position of is determined by the hull shape.
In a state where the bow mask 10 is attached to the hull, an upper opening 14 is provided between the bow mask side plates 11a and 11b and the hull, and a lower opening is provided between the bow mask side plates 11a and 11b and the bow valve 2. 15 is formed. A gap 16 is formed between the rear ends of the bow mask side plates 11a and 11b and the hull.

  In FIG. 4, a tangent line Y drawn from the front end line X to the ship side skin of the hull is shown, and the bow mask side plates 11 a and 11 b are arranged along the tangent line Y.

As described above, according to the present embodiment, the bow mask front end portion 12 is set in the vicinity of the rear of the front end line X that connects the tip 1a and the front portion 2a of the bow valve 2, so that the bow mask front end portion 12 becomes the front end. The safety at the time of navigation is high because it does not protrude before the line. In addition, since the bow mask front end 12 faces the rear part of the bow valve 2 at the upper part and rearward, the effect of suppressing the wave resistance of the bow valve 2 is not hindered.
In addition, according to the present embodiment, by arranging the pair of bow mask side plates 11a and 11b along the tangent line Y drawn from the front end line X to the left and right ship side outer plates of the hull, for example, the propulsion direction and the wave direction can be changed. Even if they do not coincide with each other, the phenomenon that the reflected waves of the bow mask side plates 11a and 11b collide with the bow portion does not occur, so that the resistance due to the reflected waves can be reliably reduced.
Further, according to the present embodiment, the bow mask side plates 11a and 11b are supported on the hull by the support structure 13, and the upper opening 14 is formed at the upper part of the bow mask side plates 11a and 11b, and the bow mask side plates 11a and 11b. By forming the lower opening 15 in the lower part, there is no drainage and the hull structure weight is not increased.

Further, according to the present embodiment, the upper opening 14 is formed as a gap between the bow mask side plates 11a, 11b and the hull, and the lower opening 15 is formed as a gap between the bow mask side plates 11a, 11b and the bow valve 2. Thus, when the bow mask 10 is attached to the hull, the upper opening 14 and the lower opening 15 can be formed, and it is not necessary to provide openings in the bow mask side plates 11a and 11b in advance. Further, by utilizing the gap between the bow mask side plates 11a, 11b and the hull and the gap between the bow mask side plates 11a, 11b and the bow valve 2, a certain opening can be reliably formed in the upper part and the lower part. Accordingly, the weight of the bow due to the compression of the air accumulated in the upper part by the waves during navigation and the weight due to the seawater entering and staying in the lower part are not added.
Furthermore, inspection and maintenance inside the bow mask 10 can be facilitated from the upper opening 14 and the lower opening 15. In particular, even when floating in the sea, it is possible to observe and deal with the deterioration state of the coating and the adhesion state of foreign matter and marine organisms from the upper opening 14. Further, when entering the dock, the operator enters the bow mask 10 from the lower opening 15 and can perform maintenance and inspection.
Further, according to the present embodiment, the gap 16 is also formed between the rear end portions of the bow mask side plates 11a and 11b and the hull, so that the bow portion is pushed up by the compression of the air accumulated in the upper part during the navigation. In addition, it is possible to more reliably prevent the weight due to the seawater from entering and staying in the lower part.

Hereinafter, other embodiments of the bow mask of the present invention will be described.
5 is a side view of an essential part of a ship equipped with a bow mask according to the present embodiment, FIG. 6 is a plan sectional view of an essential part taken along line AA in FIG. 5, FIG. 7 is an enlarged view of the essential part of FIG. It is a perspective view of the round frame location of FIG. The same functional members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.
FIG. 5 shows a horizontal position Z of the bow structure 4 of the hull, and a support structure (stringer) 23 for supporting the bow mask side plates 11a and 11b on the hull is provided at the horizontal position Z. That is, the mounting position of the support structure 23 on the hull is matched with the position of the bow structure 4.

  As shown in FIG. 6, the bow structure 4 of the hull is a horizontal structure including a center line girder 4a and stringers 4b arranged on both sides of the center line girder 4a. The support structure 23 has the same type of structure as the bow structure 4, and is a horizontal structure including a center line girder 23a, frames 23b arranged on both sides of the center line girder 23a, and openings 23c. is there.

  As shown in FIGS. 7 and 8, a mounting portion 23 d is provided on the hull side of the support structure 23 along the hull outer plate. Note that the width in the height direction of the mounting portion 23d can be set small to the thickness of the frame 23b.

As described above, according to the present embodiment, the attachment of the support structure 23 to the hull is performed in accordance with the horizontal position Z of the bow structure 4 of the hull. Can be high. Even when an external force such as a wave is received, the force applied to the support structure 23 is directly received by the bow structure 4, so that the hull can be prevented from being damaged.
In addition, according to the present embodiment, the support structure 23 has the attachment portion 23d attached to the hull, so that the support structure 23 can be easily and surely attached to the hull, and the force can be distributed by giving the width. .

Hereinafter, still another embodiment of the bow mask of the present invention will be described.
FIG. 9 is a plan cross-sectional view of the main part of the ship to which the bow mask according to the present embodiment is attached, corresponding to FIG. The same functional members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.
In the present embodiment, the bow mask side plates 21a, 21b are curved outwardly convex.

  As in the present embodiment, the bow mask side plates 21a and 21b are curved outwardly convex, thereby making the bow mask side plates 21a and 21b thinner to further reduce the weight, and the bow mask side plates 21a and 21b are waved. Therefore, it is possible to surely prevent the occurrence of a portion where the wave deflected by the side and the deflected wave on the side surface is concentrated. Actually, the bow mask front end portion 12 cannot be sharply sharpened due to safety problems or the like, and therefore the bow mask front end portion 12 is preferably R-shaped.

Hereinafter, still another embodiment of the bow mask of the present invention will be described.
FIG. 10 is a side view of an essential part of a ship equipped with a bow mask according to the present embodiment, and FIG. 11 is a plan sectional view of an essential part taken along line AA in FIG. The same functional members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.
In this embodiment, the rear end portions of the bow mask side plates 11 a and 11 b and the hull are fixed by welding 17. The support structure 13 is also fixed to the hull by welding 18.

According to this embodiment, by attaching the rear end portions of the bow mask side plates 11a, 11b to the hull by welding 17, the strength of attaching the rear end portions of the bow mask side plates 11a, 11b to the hull can be increased.
Further, according to the present embodiment, the support structure 13 is attached to the hull by welding 18, so that the upper opening 14 between the bow mask side plates 11 a and 11 b and the hull and the bow mask side plates 11 a and 11 b and the bow valve 2 are connected. It is easy to form a lower opening 15 therebetween.
Further, by attaching the bow mask side plates 11a and 11b and the support structure 13 by welding 17 and welding 18 from the outside of the hull, it can be easily retrofitted from the outside even if the ship is an existing ship or a small ship. A bow mask can be attached.

Hereinafter, still another embodiment of the bow mask of the present invention will be described.
FIG. 12 is a plan side view of the main part of the ship to which the bow mask according to the present embodiment is attached, and corresponds to FIG. The same functional members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.
In this embodiment, the upper opening 24 is formed in the upper part of the bow mask side plates 11a and 11b, and the lower opening 25 is formed in the lower part of the bow mask side plates 11a and 11b. An intermediate opening 19 is formed at the rear end of the bow mask side plates 11a and 11b. The bow mask side plates 11a and 11b are fixed to each other by welding 17 between the rear end and upper and lower portions of the bow mask side plates and the hull.

According to the present embodiment, the upper opening 24 is formed in the upper part of the bow mask side plates 11a, 11b, and the lower opening 25 is formed in the lower part of the bow mask side plates 11a, 11b. Does not increase. Further, the upper opening 24 and the lower opening 25 prevent the bow from being pushed up by the compression of the air accumulated in the upper part by waves during navigation and the addition of weight due to the intrusion and retention of seawater in the lower part. The intermediate opening 19 further assists these actions.
Further, according to the present embodiment, the rear end portions and upper and lower portions of the bow mask side plates 11a and 11b are attached to the hull by welding 17, so that the attachment strength of the rear end portions of the bow mask side plates 11a and 11b to the hull is increased. It can be further increased.

  In each of the above-described embodiments, an example is shown in which the tip 1a is positioned in front of the front portion 2a of the bow valve 2 when viewed from the side. However, when the tip 1a is located at the same position, the tip 1a is also forward. There may be a case where it is located behind the front part 2 a of the valve 2. The idea of the present invention can be applied to these cases. Further, the bow mask front end portion 12 may be curved in a range along the front end line X instead of a straight line.

  The present invention particularly relates to a bow mask attached to a ship of a large-sized ship and a ship fitted with the bow mask, and is suitable for a ship having a constriction between a tip of a hull and a bow valve.

DESCRIPTION OF SYMBOLS 1a Tip 2 Bow valve 2a Front part 3 Constriction 4 Bow part structure 10 Bow mask 11a, 11b Bow mask side plate 12 Bow mask front end part 13 Support structure 14 Upper opening 15 Lower opening 16 Gap 17 Welding 18 Welding 21a, 21b Bow mask Side plate 23 Support structure 24 Upper opening 25 Lower opening X Front end line Y, Y 'Tangent

Claims (8)

A bow mask attached to a ship having a constriction between the tip of the hull and the bow valve, and a bow mask front end set so as not to protrude forward of a front end line connecting the bow and the front part of the bow valve; A pair of bow mask side plates disposed along a tangent line drawn from the front end line to the left and right ship side skins of the hull, and a support structure that supports the bow mask side plate by attaching to the hull. An upper opening is formed in the upper portion of the bow mask side plate, a lower opening is formed in the lower portion of the bow mask side plate, and the mounting position of the support structure to the hull is provided inside the hull outer plate of the hull. A bow mask characterized by the position of a bow structure such as a horizontal structure .   The bow according to claim 1, wherein the upper opening is formed as a gap between the bow mask side plate and the hull, and the lower opening is formed as a gap between the bow mask side plate and the bow valve. mask.   The bow mask according to claim 1 or 2, wherein a gap is formed between a rear end portion of the bow mask side plate and the hull. The said attachment position to the said hull of the said support structure is made into the position of the said horizontal structure which is one of the said bow structure, The Claim 1 characterized by the above-mentioned. Bow mask.   The bow mask according to any one of claims 1 to 4, wherein the support structure has a mounting portion attached to the hull.   6. The bow mask according to any one of claims 1 to 5, wherein the bow mask side plate has an outwardly convex curved surface.   A ship with a bow mask to which the bow mask according to any one of claims 1 to 6 is attached. The ship with a bow mask according to claim 7, wherein the support structure is attached to the hull by welding.