JPH02169385A - Hull construction - Google Patents

Abstract

PURPOSE:To make improvements in rigidity of the bottom as making it lighter in weight by forming the bottom into a double structure, and charging a buoyant body consisting of foaming material to an interspace between both first and second bottom plates, while attaching a mounting bracket for setting inboard equipment tightly on the second bottom plate. CONSTITUTION:When it is executed to a hull construction of a small jet propulsion boar, the hull 11 is constituted of its bottom 12 and an upper deck 13 mounted on this bottom 12, and an engine room 14 is partitioned off by those of bottom 12 and upper deck 13. The bottom 12 is formed in to a double structure with both first and second bottom plates 25, 26, and a buoyant body 27 consisting of foaming material is charged to a interspace between both these bottom plates 25, 26. In this case, these bottom plates 25, 26 are made of glassfiber reinforced plastics, and the second bottom plate 26 is extended almost in flatness in the boat length direction from the bow of the hull 11. Then, a base plate 30 as a mounting bracket for inboard equipment including an engine 20 or the like is clamped to a specified position on this second bottom plate 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a hull structure, and in particular, to a hull structure of a small jet propulsion boat that is mainly a one-person boat that glides at high speed on the sea.

(Prior Art) Recently, small jet propulsion boats, which are small boats with engines and are designed to glide on water, have come into wide use. This boat glides on the water and
It performs various operations such as sudden starts and turns. Therefore, the bottom of this type of watercraft has many chances to collide with floating objects floating on the water, and there is a risk of damage.

The invention described in JP-A-62-125984 (hereinafter referred to as No. 1)
This is called a conventional example. ) was proposed in consideration of the above circumstances. That is, a floating body made of a foam material is filled in contact with the front part of the engine room and the bottom of the ship on the ship's side. As a result, even if a floating object or the like collides with the bottom of the bow and the bottom of the bow is damaged, the inner floating body will prevent flooding.

On the other hand, some hulls of small jet propulsion boats are constructed as shown in Fig. 5 (hereinafter referred to as the second conventional example).
. In other words, the bottom plate 1 is made of glass, fiber reinforced plastic,
ic (hereinafter referred to as FRP). An inboard equipment mounting base such as an engine mounting base 2 is adhered to the inside of the engine room constituted by the bottom plate 1. The engine mounting base 2 and the like are also made of FRP, and a base plate 3 as a mounting bracket made of stainless steel is inserted in advance into the engine mounting base 2 and the like. moreover,
Mount 5 fixed to mount base 4 with bolt 6
The mount 5 is attached to the engine mounting base 2 via an inboard equipment plate such as an engine plate 7, and inboard equipment such as an engine is attached to this mount 5 via an inboard equipment plate such as an engine plate 7.

Note that the base plate 3 and the engine plate 7 are made of stainless steel, and the mount 5 is made of rubber. In addition, since the mounting surface of the engine mounting base 2 on the bottom plate 1 is a rough surface as described later, after the engine mounting base 2 is glued to the bottom plate 1, glass fiber is inserted into the outer periphery of the engine mounting base 2. Resin is applied in a laminated manner 8 for reinforcement.

(Problems to be Solved by the Invention) In the first conventional example, even if the bottom plate of the ship is damaged, the floating body is used to prevent flooding. However, since this floating body does not serve as a strength member of the ship's bottom, in order to improve the rigidity of the ship's bottom, the thickness of the ship's bottom plate itself must be increased, which increases the weight of the ship's hull.

Also, in the second conventional example, the inboard equipment mounting bases such as the engine mounting base 2 are partially fixed to the bottom plate 1 and are not large enough, so the strength of the bottom plate 1 is limited. It cannot be a member. Therefore, in this case as well, in order to improve the rigidity of the ship bottom, the thickness of the ship bottom plate 1 itself must be increased, which increases the distance between the hull bodies.

Furthermore, particularly in the second conventional example, when installing the engine, for example, the base plate 3 is attached to the engine mounting base 2, and the engine mounting base 2 is fixed to the bottom plate 1,
Many steps are required, such as applying a build-up 8 around the base 2 to reinforce it, attaching a mount 5 to the engine mounting base 2, and attaching the engine to the mount 5 via the engine plate 7. Therefore, the installation work for inboard equipment such as engines becomes complicated and installation is not easy.

In particular, the bottom plate 1 has molten FR on the inner surface of the mold of the bottom plate.
It is manufactured in a laminated form by applying P many times.

Therefore, the inner surface of the bottom plate 1 is a rough surface.

Therefore, in order to fix the engine mounting base 2 to the rough inner surface of the bottom plate 1, it is very difficult to position the engine mounting base 2. For this reason as well, it is not easy to install onboard equipment such as engines.

This invention was made in consideration of the above-mentioned circumstances, and improves the rigidity of the bottom of the ship while reducing weight, and also improves safety by reliably preventing flooding even if the bottom plate of the ship is damaged. It is an object of the present invention to provide a hull structure that allows for easy installation of inboard equipment to the bottom of the ship.

[Structure of the invention]

(Means for Solving the Problems) The present invention is characterized in that the bottom of the ship has a double bottom plate having a first bottom plate and a second bottom plate, and a buoyant body made of a foam material is filled between the first and second bottom plates. and is composed of
The present invention is characterized in that it is configured such that a mounting bracket for mounting inboard equipment can be fixed onto the second bottom plate.

(Function) Therefore, according to the hull structure according to the present invention, since the bottom is composed of the first and second bottom plates and the buoyancy body, the overall rigidity of the bottom can be improved without increasing the thickness of each bottom plate. This can be avoided as a result. Therefore, the rigidity of the boat bottom can be improved without increasing the weight of the boat bottom by increasing the thickness of the boat bottom plate.

Moreover, since the buoyancy body is filled between the first and second bottom plates, even if the first bottom plate is damaged, water intrusion can be reliably prevented by the buoyancy body and the second bottom plate. Furthermore, since buoyancy is ensured by this buoyant body, submergence of the hull can be prevented, improving safety.

Furthermore, since the second bottom plate is configured to allow direct attachment of the mounting fittings, it also serves as a base for mounting inboard equipment. Also, since this second bottom plate is approximately the same size as the first bottom plate, it becomes a strength member with respect to the first bottom plate.
It can contribute to improving the rigidity of the bottom of the ship. Not only this, but it is no longer necessary to separately install the onboard equipment mounting bases, and only the mounting brackets need to be attached individually, so the number of steps in the onboard equipment installation work can be reduced, and the onboard equipment installation work can also be made easier.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a partially cutaway side view showing a small jet propulsion boat to which an embodiment of the hull structure according to the present invention is applied;
The figure and FIG. 2 are cross-sectional views taken along the line II--II and the line mm in FIG. 3, respectively.

As shown in FIG. 3, in the hull 11 of the small jet propulsion boat, an engine room 14 is surrounded by a bottom 12 and an upper deck 13 attached to the bottom 12. A seat 15 is installed to protrude from the center of the hull 11 to the rear side in the width direction of the hull, and a foot deck 17 that opens to the stern end is formed between the seat 15 and the gunwales 16 on both sides. . The rider on the seat 15 puts his feet on the 7-todetsuki 17, grips the handlebar 18, and steers the boat.

In the upper deck 13, an opening is formed above the engine room 4, and an engine hatch 19 is attached so as to be openable and closable so as to cover this opening.In addition, an engine 20 is arranged in the engine room 14. The engine 20 operates the jet pump 21 to suck water from the suction port 22 in the bottom 12.The sucked water is
・Pump nozzle 23 that swings horizontally at the stern
It is injected backwards to generate turning force and propulsive force.

Reference numeral 24 indicates a fuel tank, and equipment disposed in the engine room 14, such as this fuel tank 24 and the engine 20, is inboard equipment.

As clearly shown in FIGS. 1 and 2, the bottom 12 has a double structure having a first bottom plate 25 and a second bottom plate 26.
A buoyant body 27 made of a foam material is filled between 26 and 26. 1st
The second bottom plates 25 and 26 are made of FRP, and the second bottom plate 26 constitutes the engine room 14 together with the upper deck 13. The filling of the buoyant body 27 is actually carried out after the first and second bottom plates 25, 26 are fixed in the gunwale 16 with a jig.

The first and second bottom plates 25,26 are formed by a first bottom plate mold 28.26, as shown in FIG. The upper surface of each of the second bottom plate molds 29 is coated with molten FRP many times to form a laminated structure.

Therefore, the surfaces of the first and second bottom plates 25.26 that contact the first and second bottom plate molds 28.29, respectively, are formed smoothly, but the opposite surfaces are rough. 1st
The second bottom plates 25 and 26 are arranged with the rough surfaces inside, that is, so that the buoyancy bodies 27 are in contact with the rough surfaces, thereby forming the bottom 12 of the ship.

The second bottom plate 26 not only constitutes the engine room 14, but also extends substantially flat from the bow of the hull 11 in the ship's direction, as shown in FIG. 21 to the stern of the ship. Therefore, this second bottom plate 26 is similar to the first bottom plate 25.
Since it has a size comparable to that of the first bottom plate 25, it functions as a strength member located above the first bottom plate 25. For this reason, the bottom 12
The rigidity of the first bottom plate 25 is improved, and the thickness of the first bottom plate 25 is reduced.

Further, the second bottom plate 26 functions as an iM mounting base for inboard Ia equipment such as the engine 20 in the engine room 14 . That is, as shown in FIG. 1, for example, in order to mount the engine 20, a base plate 30 as a mounting bracket is fixed to a predetermined position on the second bottom plate 26. Next, a mount 32 is fixed onto this base plate 30 via a mount base 31. This mount 3
The engine 20 is installed on the engine 2 via the engine plate 33. Other inboard equipment such as the fuel tank 24 is attached in the same manner. Here, the base plate 30. The mount base 31 and the engine plate 33 are made of stainless steel, and the mount 32 is made of rubber.

According to the above embodiment, as shown in FIGS. 1 and 2, the bottom 12 is connected to the first bottom plate 25. It is composed of a second bottom plate 26 and a buoyant body 27, and among these, the second bottom plate 26 has the same size as the first bottom plate 25, so it becomes a sufficient strength member for the first bottom plate 25. . Therefore, the rigidity of the bottom 12 can be improved. Since the rigidity of the bottom 12 is improved in this way, the thickness of the first bottom plate 25 can be reduced, and the weight of the bottom 12 can also be reduced.

In addition, in addition to the first bottom plate 25, the bottom 12 is also constituted by a second bottom plate 26 and a buoyant body 27.
Even if the bottom plate 25 is damaged by floating objects on the water,
The second bottom plate 26 and the buoyancy body 27, especially the second bottom plate 26, can reliably prevent water from entering. In this case, since buoyancy is ensured by the buoyant body 27, submergence of the hull 11 can be prevented, and the safety of the small jet propulsion boat can be improved.

Furthermore, the second bottom plate 26 functions as a mounting base for inboard equipment such as the engine 20 in the engine room 14, so when installing inboard equipment such as the engine 20, the engine mounting base 2 as in the conventional There is no need to provide it. It is sufficient to individually and directly attach the engine plate 33 and the like onto the second bottom plate 26. Therefore, the number of steps for installing the engine 20 and the like can be reduced, and the work for installing the engine 20 and other inboard equipment can be easily performed.

In particular, the surface of the second bottom plate 26 to which the engine plate 33 is attached is smooth on the surface in contact with the second bottom plate mold 29 shown in FIG. be able to. From this point of view as well, it is possible to facilitate the installation work of inboard equipment such as the engine 20, and also to improve the accuracy of the installation.

Further, the second bottom plate 26 constituting the engine room 14 has a surface in contact with the second bottom plate mold 29 that forms the engine room 14.
Further, a buoyant body 27 is hidden by the second bottom plate 26 . For these reasons, engine room 14
It can also improve the internal beauty.

In addition, since the second bottom plate 26 is formed in a flat shape, even if water accumulates in the engine room 14, for example, by operating the
! ! Water can be discharged at certain locations.

As a result, drainage can also be simplified.

〔Effect of the invention〕

As described above, according to the hull structure according to the present invention, the bottom of the ship is a two-am structure having a first bottom plate and a second bottom plate, and a buoyant body made of a foam material is provided between the first and second bottom plates. In addition to being configured so that mounting brackets for installing inboard equipment can be fixed on the second bottom plate, it is possible to improve the rigidity of the bottom while reducing the weight. Furthermore, even if the bottom plate of the ship were to be damaged, it would be possible to reliably prevent flooding and improve safety. Furthermore, since the second bottom plate also serves as an inboard equipment mounting base, inboard equipment can be easily attached to the bottom of the ship.

[Brief explanation of the drawing]

Figures 1 and 2 are the I-I line and I line in Figure 3.
3 is a cross-sectional view taken along line I-II, FIG. 3 is a partially cutaway side view of a small jet propulsion boat to which an embodiment of the hull structure according to the present invention is applied, and FIG. FIG. 5 is a cross-sectional view showing the main parts of FIG. 1 in an enlarged manner, and FIG. DESCRIPTION OF SYMBOLS 11... Hull, 12... Bottom, 20... Engine, 25... First bottom plate, 26... Second bottom plate, 27
... Buoyant body, 30... Base plate. Applicant's agent: Hisashi Hatano Procedural amendment for deafness 1 (Voluntary) February 23, 1989 Fumitake Yoshida, Director General of the Special Hinoki Agency 1, Indication of fl. 1988 Patent Application No. 322185 2, Name of invention Hull structure 3 , relationship with the person making the amendment

Claims (1)

[Claims] The bottom of the ship has a double structure having a first bottom plate and a second bottom plate, and a buoyant body made of a foam material is filled between the first and second bottom plates, and a buoyant body made of a foam material is filled between the first and second bottom plates. A hull structure characterized by being configured such that a mounting bracket for mounting onboard equipment can be fixed to the hull structure.