JP2016527114A - Hatch cover for marine vessels - Google Patents

Abstract

A hatch cover (1) comprising a cover body (17) and a skirt (4) hanging from the cover body (17) and surrounding the periphery. The skirt (4) has a support portion (8) on the hatch combing (2) of the ship and supporting the hatch cover (1), and the support portion (8) has a central long groove (9). Is attached. A lower sealing member (10) having elasticity that bulges from the central long groove (9) is attached to the central long groove (9) to seal the hatch combing (2). The lower sealing member (10) is deformed when the ship is in a normal use state and is pressed together with the hatch cover (1), and the lower sealing member (10) is deformed in the central long groove (9). It is comprised so that it may be pushed into. A plurality of stiffening bodies (18) are attached to the inside of the cover body (17). The cover body (17), the skirt (4) and the stiffening body (18) are made of fiber reinforced plastic. [Selection] Figure 5

Description

  The present invention relates to a hatch cover suitable for a marine vessel such as a Panamax bulk carrier. The present invention particularly relates to a hatch cover made of fiber reinforced plastic and a ship including the hatch cover.

  Generally, hatch covers for marine vessels are made of steel. Such hatch covers are heavy and require a sturdy support structure. Further, a powerful and expensive lifting / operating device is required to move the hatch cover. Such a hatch cover cannot always properly waterproof cargo to be transported. In addition, since the conventional hatch cover is heavy, the cargo loading capacity of the ship is reduced.

Korean Published Patent No. 20090087658 GB Patent Application No. 913497 Korean Open Patent 201110102530 International Publication No. 2009/0064175

  An object of the present invention is to provide a lightweight ship hatch cover that can reliably protect cargo to be transported.

  These and other objects are achieved by a hatch cover according to the first aspect of the present invention. The hatch cover includes a cover main body and a skirt that surrounds the cover main body and hangs down from the cover main body. The skirt is provided on a ship's hatch coaming and includes a support portion that supports the hatch cover, and the support portion includes a central long groove. An elastic lower sealing member is attached to the central long groove so as to protrude from the central long groove and seal between the hatch combing. The lower sealing member is configured to be deformed and pushed into the central long groove when pressed by a hatch cover and a ship during normal use. A plurality of stiffening bodies are provided inside the cover body. The cover body, the skirt and the stiffener are made of fiber reinforced plastic.

  Since the stiffening body is provided and fiber reinforced plastic is used for the cover body, the skirt, and the reinforcing body, a hatch cover that is robust, lightweight, and has corrosion resistance can be obtained. The hatch cover can evenly distribute the load applied from the top of the hatch cover and is pushed down toward the ship placed under the hatch cover so that it is good on the entire circumference of the skirt surrounding the hatch cover. Watertightness can be maintained. Since the cover main body covers the hatch of the ship, intrusion of water from the hatch is prevented. The skirt is on the upper surface of the ship, generally on the hatch combing around the hatch, and supports the hatch cover via the support portion of the skirt. When the hatch cover is in a position covering the hatch, the lower sealing member is pressed by the combing to seal the combing, and water enters the hatch through the sealing member. prevent.

  When the hatch cover is pressed against the vessel, the sealing member is deformed and compressed, and is pushed into the central long groove of the support portion, and the support portion of the hatch cover is a surface below it. Directly supported. In this way, the sealing member is protected from excessive loads, and as a result, excessive wear and breakage of the lower sealing member is prevented. In other words, the maximum pressure applied to the lower sealing member is suppressed. This effectively provides more reliable protection for the goods carried under the cover.

  The hatch cover is substantially rectangular, and includes a skirt portion disposed to face in the length direction and the width direction. The stiffening body is located between the skirt portions arranged opposite to each other in the length direction or the width direction, and extends across the cover body. Both ends of the stiffener are coupled to the skirt. Since the skirt and the stiffening body are combined, the structural soundness of the hatch cover is improved. Therefore, the thickness of the skirt and the cover body can be reduced to reduce the weight. Further, the load can be distributed from the cover body to the hatch combing via the stiffener and the skirt.

  The stiffeners may be arranged at intervals at their ends. By doing so, it becomes possible to attach components or open a ventilation opening in the space formed between the adjacent stiffeners.

  A plurality of stiffening plates may be arranged inside the skirt so as to extend substantially perpendicular to the inside of the skirt. If the stiffening plate is provided in the skirt, the soundness of the portion of the skirt that is not coupled to the stiffener is improved.

  You may make it provide a stopper member in at least one part of the said stiffening body. The stopper member has a protrusion. The projecting portion engages with a corresponding recess of a stopper socket attached to the marine vessel to suppress relative movement of the marine vessel and the hatch cover. When the hatch cover is positioned over the hatch, the stopper member engages a corresponding recess in the stopper socket. As a result, the stopper member cannot be moved relative to the ship in the length direction or the width direction in each portion adjacent to each hatch socket stopper socket. Thus, since the fixed movement of each site | part of the said skirt to which each stopper member was attached is suppressed, the excessive abrasion of the said lower sealing member is suppressed by providing the said stopper member. However, in general, the stopper member and the socket do not hinder the vertical movement of the hatch cover and the ship. Therefore, the hatch cover can be easily moved up and down. Further, since the stopper member and the socket are configured in this way, the skirt portion adjacent to each stopper member is moved inwardly and outwardly in a direction perpendicular to each part of the skirt portion. Movement is allowed to some extent.

  As a result, the flexibility of the hatch cover is improved, so that appropriate waterproofness is ensured. In addition, there is an effect that local stress is relieved. Therefore, a hatch cover having appropriate strength can be designed to be lightweight. The stopper member may be made of metal. By doing so, the wear resistance of hatch covers made of fiber reinforced plastic is improved.

  The hatch cover may be provided with a cleat bracket at a site outside the skirt. If the cleat bracket is provided, the hatch cover can be detachably coupled to a cleat attached to the ship. Since the compressive force applied to the sealing member and the load applied to the hatch cover can be regulated by the number and position of the cleat brackets, it is possible to prevent excessive stress from being generated in the hatch cover. This is particularly important in lightweight structures, such as structures made of fiber reinforced plastic.

  The cleat bracket may be attached to the upper surface of the cover body. If the cleat bracket is disposed at such a position, it can be detachably coupled to the adjacent hatch cover, and therefore a larger hatch structure can be formed by combining several hatch covers.

  There is at least one side ridge in at least one outer portion of the skirt, the side ridge includes a central long groove, and a resilient side sealing member is attached to the central long groove of the side ridge, The side sealing member protrudes from the groove and seals between adjacent hatch covers. Since the side ridge and the side sealing member are provided, any one of the opposed planes against which the side ridge is pressed is not affected by the relative movement between the side ridge and the opposed plane. These members can be formed and sealed. Similar to the lower sealing member, the side sealing portion is protected from an excessive load, so that excessive wear and breakage of the lower portion are suppressed. According to the side ridge and the sealing member, more reliable protection is effectively provided for the goods that are transported under the cover.

  According to one aspect of the present invention, a set of hatch covers as described above is provided. When the hatch cover sets are arranged adjacent to each other in order to close one hatch, the adjacent side ridges of the hatch cover set may extend in parallel to each other. Since each ridge extends parallel to each other, the relative movement in their first direction is limited. This is advantageous because it ensures proper waterproofing.

  According to a further aspect of the invention, a hatch cover system is provided. The system includes a ship and one or a plurality of the hatch covers described above. Each hatch is surrounded by hatch combing, and the hatch cover is configured to fit one of the hatch combings, so the lower sealing member is adapted to seal each hatch combing To do. According to the hatch cover system of the present invention, more reliable protection is provided for commodities that are transported under the cover.

  In order to prevent the skirt of each hatch cover from moving inward, an inner support ridge may be provided in the hatch combing. According to the inner support ridge, the regulation of the movement of the skirt is improved, so that the hatch cover can be designed to be light without risking excessive deformation of the hatch cover and a decrease in sealing performance. .

  In order to prevent the skirt of each hatch cover from moving outward, an outer support ridge may be provided in the hatch combing. Thereby, the structural soundness of the hatch cover is improved. There is also an effect that the lateral displacement of the hatch cover is suppressed, so that the hatch cover does not come off the hatch combing or move to a position where it cannot be sealed.

  The system may include a stopper socket attached to the ship and the corresponding stopper member described above. The stopper member and the stopper socket are configured to engage with each other. At least relative movement in the longitudinal direction of the skirt is prevented by the corresponding stopper socket. The combination of the stopper member and the stopper socket functions as described above. The stopper member engages with a corresponding recess of a corresponding stopper socket to restrict relative movement.

  As a result, unintended side slip of the hatch cover is suppressed, and the hatch cover is held in a predetermined position. When the hatch cover is moved, for example, when the hatch cover is slid open to allow access to the hatch, the hatch cover is first lifted. As a result, the stopper member and the stopper socket are not engaged with each other.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing specific embodiments of the present invention.

FIG. 1 is a three-dimensional view of a hatch cover according to an embodiment of the present invention. FIG. 2 illustrates the top surface of the hatch cover shown in FIG. FIG. 3 illustrates a cross section of the hatch combing shown in FIGS. 1 and 2. FIG. 4 shows a longitudinal section of the hatch combing shown in FIGS. FIG. 5 is a cross-sectional view of the hatch combing shown in FIGS. 1 to 4 taken along line AA in FIG. FIG. 6 is a cross-sectional view of the hatch combing shown in FIGS. 1 to 5 taken along line BB in FIG. FIG. 7 shows a longitudinal section of the hatch combing shown in FIGS. 1 to 5 taken along line CC in FIG. FIG. 8 is a three-dimensional illustration of a plurality of stiffeners, with the frontmost stiffeners having web plates attached to the skirts of the hatch cover. FIG. 9 is a three-dimensional view of the hatch cover according to the embodiment of the present invention when viewed from below, and the hatch cover includes a stiffening plate, a web plate, and a ventilation port. FIG. 10 is a three-dimensional illustration of a plurality of web plates according to the embodiment. FIG. 11 is a three-dimensional view of a part of the hatch cover according to the embodiment of the present invention when viewed from below. FIG. 12 is a three-dimensional view of a portion of the skirt of the hatch cover according to the embodiment of the present invention, which includes a plurality of stiffening plates. FIG. 13 is a three-dimensional view of a portion of the hatch cover shown in FIGS. 1 to 7, and the portion includes an opening for ventilation of the hatch. FIG. 14 is a three-dimensional view of a portion of the hatch cover shown in FIGS. 1 to 8, and the portion includes rounded corners. FIG. 15 is a cross-sectional view of a part of two adjacent hatch covers. The two hatch covers are joined together using cleats, and each sealing member and side ridge are joined together. Are closely sealed. FIG. 16 illustrates a longitudinal section of a portion of the hatch cover placed on the hatch combing and secured by the cleat, taken along line CC in FIG. FIG. 17 is a three-dimensional view of the stopper socket according to the embodiment, and the stopper socket is attached to a concave portion of the hatch combing. FIG. 18 illustrates the stopper socket shown in FIG. FIG. 19 is a three-dimensional illustration of a stopper member according to an embodiment suitable for engagement with the stopper socket shown in FIGS. 17 and 18. FIG. 20 is a three-dimensional view of the hatch cover placed on the hatch coaming as viewed from below, including the stopper member and the stopper socket shown in FIGS. FIG. 21 is a three-dimensional view of the cleat bracket according to the first embodiment as viewed from the front upper side. FIG. 22 is a three-dimensional view of the cleat bracket shown in FIG. FIG. 23 is a three-dimensional view of the cleat bracket according to the second embodiment as viewed from the front upper side. FIG. 24 is a three-dimensional view of the cleat bracket shown in FIG. FIG. 25 is a side view of an end portion of the hatch cover according to an embodiment of the present invention arranged in the hull width direction so that a cross section of the portion of the skirt arranged in the hull length direction can be seen. The corrugated member (the stiffening body (18)) is removed from the figure to conceal the portion arranged in the width direction of the hull and to make the figure clear. FIG. 26 is a cross-sectional view of the hatch cover according to the embodiment of the present invention when viewed from the width direction of the hull, and the hatch combing includes an inner support ridge. FIG. 27 illustrates a corner portion of a hatch combing that includes an inner support ridge, an outer support ridge, a rail, and a drain hole.

  The hatch cover 1 according to the first embodiment shown in FIG. 1 is disposed on the hatch combing 2. The hatch cover 1 includes a cover body 17 and a skirt 4 that hangs down from the cover body 17 and surrounds the periphery. The skirt 4 includes a support portion 8 that is on the hatch combing 2 of the ship and supports the hatch cover.

The ship used in the embodiment of the fiber reinforced plastic hatch cover and the specifications of the ship are as follows.
Oshima Shipyard Co., Ltd. No. 10692 Ship 77,000 Tons of Bulk Cargo Ship Hull Dimensions: 220 m x 32.26 m x 19.79 m x 12.20 m
Type of dry rice: B-60
Of course, the hatch cover according to the present invention can be applied to other ships within the scope of the present invention, and also to hatches of other sizes and hatch combing.

  The hatch cover 1 is made of fiber reinforced plastic, and has an outer dimension of 8.01 m × 17.10 m. The height of the hatch cover 1 is 0.83 m to 1.03 m. As shown in FIG. 1, the cover body 17 has two inclined portions connected to a flat portion having a width of 1250 mm at the center. In the embodiment shown here, the thickness of the material of the hatch cover 1 varies between 10 mm and 40 mm. The total weight of the fiber reinforced plastic for one hatch cover 1 is about 14,000 kg, which is about 40% of the weight of the corresponding steel hatch cover. The thickness of the material can be further optimized. One hatch of the ship is closed by the two hatch covers 1, 1b.

  2, 3, 8, 13, 14, 20 and 26, in order to strengthen the cover body 17 and transmit and distribute the stress generated by the load on the cover body 17 to the skirt 4, A plurality of stiffening bodies 18 are provided inside. The stiffening body 18 is a part of the skirt 4 arranged in the hull length direction and extends across the cover body 17 between the parts arranged facing each other, and both ends of each stiffening body 18 are at the skirt 4. Combined with. As shown in FIG. 8, the stiffening body 18 is formed to have a trapezoidal waveform. The wall member facing the stiffening body may be made of a single sheet or a sandwich material having a core covered with a fiber-reinforced plastic plate.

  As shown in FIGS. 2, 3 and 26, in order to prevent the skirt 4 of the hatch cover 1 from moving inward and outward, an inner support ridge 19 and an outer support ridge 3 are attached to the hatch combing 2, respectively. When the cleat is tensioned and the skirt is pulled downward, the lower sealing member 10 is pressed against the hatch combing 2 and prestressed. Since the inner support ridge 19 and the outer support ridge 3 prevent the skirt 4 from moving in and out, excessive wear of the lower sealing member 10 and the support surface is suppressed. It should be noted that although the stiffening body 18 is present in the present embodiment, the stiffening body 18 is not shown in FIG.

  The hatch cover 1 includes a cleat bracket 5 at a portion outside the skirt 4. The cleat bracket 5 is bolted to the skirt 4 of the hatch cover 1. 21 to 24 show two different embodiments of the cleat bracket 5. The first cleat bracket 5 shown in FIGS. 21 and 22 includes an inner plate and an outer plate. The outer plate is provided with a bolt hole, and the inner plate is a part corresponding to the bolt hole, and is provided with a threaded part that is screwed with each bolt. In another embodiment, as shown in FIGS. 23 and 24, a bolt is welded to the inner surface of the outer plate, and a through-hole through which the bolt passes is formed in the inner plate corresponding to the bolt. It has been. Each bolt is fixed on the inner surface of the inner plate using a normal nut instead of the threaded part. As shown in the figure, the inner plate is divided into two pieces so that the cleat bracket is symmetrically attached to the part of the skirt to which the stiffening plate is attached so as to extend vertically to the inner surface of the skirt. .

The transfer device 6 is attached to the side surface of the hatch cover 1 in the hull width direction. Each transfer device 6 includes a wheel attached to an arm, an electric screw jack (not shown) configured to arbitrarily raise and lower the wheel by rotating the arm, and rotating the wheel, The hatch cover 1 includes an electric motor configured to move back and forth on a rail 7 (see FIGS. 1 and 25) disposed on the ship.
When the movement of the hatch cover is required, the hatch cover 1 is lifted and the wheels of the transfer device 6 are lowered so as to be separated from all the support ridges 3. When the hatch cover 1 is lifted, the hatch cover 1 is easily moved by the wheels driven by the electric motor. As an emergency operation method when power supply does not function, the screw jack can be operated manually, the jack screw can be rotated, and the hatch cover can be moved up and down. The hatch cover can then be pulled laterally using a simple chain pulling winch.

  In order to easily handle the hatch cover 1 using a crane, a suspension ring may be attached in advance in one embodiment (not shown) of the hatch cover 1 as necessary. Needless to say, all cleats that connect the hatch cover 1 to the ship must be unconstrained before the hatch cover 1 can be lifted and moved. This simple transfer system comprising the transfer device as described above would not be practical with a conventional steel hatch cover. This is because the steel hatch cover is too heavy.

  As shown in FIGS. 6, 7, 15 and 16, the hatch cover 1 has a sealing system for watertight sealing with the hatch combing 2 and watertight sealing between the adjacent hatch covers 1, 1 b. Prepare.

  As shown in FIGS. 6, 7, 16, 25, and 26, the skirt 4 includes a support portion 8 that supports the hatch cover 1 on the hatch combing 2. The support portion has a thickness of 40 mm between the open end and the height of 100 mm. A central long groove 9 is provided at a portion below the support portion 8 and having a large plate thickness. A rubber lower sealing member 10 having elasticity is provided in the central long groove 9 and protrudes from the central long groove 9 for watertight sealing with the hatch combing 2. The lower sealing member 10 is configured to be pressed between the hatch cover 1 and the ship, deformed and pushed into the central long groove 9 during normal use. Here, normal use refers to a state in which the hatch cover 1 is attracted to the hatch coaming 2 by the cleat, and cargo is also loaded on the hatch cover 1.

  As shown in FIG. 15, the skirt 4 includes a side ridge 11, and the side ridge 11 includes a central long groove 12. In order to seal between the adjacent hatch covers 1b, the central long groove 12 of the side ridge has an elastic side sealing member 13 protruding from the central long groove 12. The side ridge 11 and the side sealing member 13 are formed as an integral member, and can be sealed anywhere between the opposing flat surface that compresses the side ridge 11 and the sealing performance of the opposing surface and the side. Little affected by the relative movement of the ridge 11.

  In one embodiment, the lower sealing member and the side sealing member are located around the entire circumference of the hatch cover 1, and are used for sealing the central long groove for sealing the hatch combing and the adjacent hatch cover 1 b. One continuous rubber member extending along both of the central long grooves.

  As shown in FIG. 15, an upper ridge 14 may be attached to the hatch cover in order to allow running water to flow aside. Further, the upper ridge 14 has a function of limiting the movement of the side ridge 11b opposite to the side ridge 11 disposed to seal the surface between the side ridge 11 and the upper ridge 14 together with the side ridge 11. . The upper ridge 14 and the side ridges 11, 11 b lead water far away, for example, directly to the outside of the hatch cover or to the drain hole 15 of the hatch combing 2, and further a drain pipe (not shown). You may make it equip an upper surface with the dent which each forms the groove | channel which leads to the outer side of the said hatch cover via.

  As shown in FIG. 18, the drain hole 16 may be provided on the bottom surface of the stopper socket 20. FIG. 19 shows a specific embodiment of the stopper member 21 assembled with the two stopper sockets 20.

  The fiber reinforced material used in the specific embodiments shown in the above-mentioned drawings is based on the conformity standard of the fiber reinforced plastic structure derived from Pt.3 Ch.4 of the Norwegian Classification Society Regulations for high speed lightweight boats. It is a glass fiber reinforced polyester resin.

  The characteristics of the material of the GRP single plate skin are shown in Table 1 below. For this structure, it is assumed that it is an injected sheet and contains 55% fiber by volume. The rule does not define a minimum value for the total amount of reinforcement specified for hatch cover applications. However, the value of 5400 g / m (ie cargo deck) shows the lowest level of the top, side and bottom plates in Pt. 3 Ch. 4, Sec. it is conceivable that.

  The thin plates 1 and 2 are made of E glass and vinyl ester resin, and fibers oriented in the direction of 0 ° / 90 ° / 45 ° / −45 ° are respectively 40% / 40% / 10% / 10%. Contains. The bottom plate is a flat intermediate portion of the stiffener 18. The thin plate 3 is made of E glass and vinyl ester resin and contains 10% / 10% / 40% / 40% of fibers oriented in the 0 ° / 90 ° / 45 ° / −45 ° directions, respectively. Yes. The thin plate 4 is made of E glass and vinyl ester resin and contains 25% / 25% / 25% / 25% fibers oriented in the 0 ° / 90 ° / 45 ° / −45 ° direction, respectively. Yes.

  It should be understood that the foregoing lamella is only one of a number of lamella options available to those skilled in the art. Any other fiber reinforced plastic sheet can be used within the scope of the present invention.

  The web plate 22 shown in FIGS. 8, 9, 10 and 11 is attached along a skirt portion connected to the same type of skirt portion of an adjacent hatch cover. Typically, the connected hatch covers cover large hatches that require a plurality of hatch covers to cover the hatch. When a plurality of hatches are used to cover the large hatch, there is no central hatch combing supported by the skirt portion at the center of the hatch opening. Therefore, a larger momentum and stress are generated in the skirt portion connected to the skirt portion supported by the hatch combing. Therefore, a web plate 22 connecting each skirt portion and the adjacent stiffener 18 is attached so that the stiffener 18 helps support the skirt portion. By increasing the strength in this way, the shape of the hatch cover can be better maintained. As a result, the sealed state between the adjacent hatch covers can be better maintained, and the conveyed cargo can be more reliably and effectively protected.

  The stiffener plate 23 shown in FIGS. 9, 10 and 11 is provided at another part of the skirt, and is an adjacent stiffening body, such as a skirt portion, which is underneath in use. It does not have to be connected to the stiffening body on which the hatch combing is placed.

  The claims of this application claim the benefit of Norwegian Patent Application No. 20130932 filed on July 3, 2013, the entire disclosure of which is incorporated herein by reference.

DESCRIPTION OF SYMBOLS 1 Hatch cover 2 Hatch combing 3 Outer support ridge 4 Skirt 5 Cleat bracket 6 Transfer device 7 Rail 8 Support part 9 Central long groove 10 Lower sealing member 11 Side ridge 12 Central long groove 13 Side sealing member 14 Upper ridge 15 (Hatch combing Drain hole 16 (for stopper socket) Drain hole 17 Cover body 18 Stiffener 19 Inner support ridge 20 Stopper socket 21 Stopper member 22 Web plate 23 Stiffener

These and other objects are achieved by a hatch cover according to the first aspect of the present invention. The hatch cover includes a cover main body and a skirt that surrounds the cover main body and hangs down from the cover main body. The cover body and the skirt surrounding the periphery of the cover body have a reverse groove-shaped cross-sectional shape. The skirt is provided on a ship's hatch coaming and includes a support portion that supports the hatch cover, and the support portion includes a central long groove. An elastic lower sealing member is attached to the central long groove so as to protrude from the central long groove and seal between the hatch combing. The lower sealing member is configured to be deformed and pushed into the central long groove when pressed by a hatch cover and a ship during normal use. The contact surface of the hatch combing is in contact with the lower sealing member and is flat. The hatch cover is disposed inside the cover main body and lacks a stiffening member extending in the hull length direction, and a plurality of stiffening members extend in the hull width direction and are arranged in the hull length direction, Arranged inside the cover body. The cover body, the skirt and the stiffener are made of fiber reinforced plastic.

Claims (15)

A cover body (17) and a skirt (4) hanging from the cover body (17) and surrounding the cover body (17) on the hatch combing (2) of the ship and supporting the hatch cover (1) A skirt (4) to which (8) is attached;
A central long groove (9) is attached to the support portion (8),
A lower sealing member (10) having elasticity that bulges from the central long groove (9) is attached to the central long groove (9), and the hatch combing (2) is sealed,
The lower sealing member (10) is deformed and pushed into the central long groove (9) when the ship is in a normal use state and is pressed together with the hatch cover (1). Is composed of
A plurality of stiffening bodies (18) are attached to the inside of the cover body (17),
The cover body (17), the skirt (4), and the stiffening body (18) are made of fiber reinforced plastic.
Hatch cover for ships (1). The hatch cover (1) is substantially rectangular with skirt portions in the hull length direction and the hull width direction, and the stiffening body (18) is in the hull length direction or the hull width direction. Extending across the cover body (17) between the opposed skirts (4), and opposite ends of the stiffeners connected to the skirt (4);
The hatch cover (1) according to claim 1. The stiffeners are spaced at the ends,
The hatch cover (1) according to claim 2. The stiffening bodies (18) are arranged at intervals over their entire length,
The hatch cover (1) according to claim 2. A plurality of web plates are attached to the inside of the skirt (4), the web plates extending substantially perpendicular to the inside of the skirt (4);
The hatch cover (1) according to any one of claims 2 to 4. A stopper member (21) is attached to at least some of the stiffeners (18), and the stopper member (21) prevents relative movement between the hull and the hatch cover (1). A protrusion engaging with a corresponding recess of a stopper socket (20) attached to the ship,
Hatch cover (1) according to any one of claims 2 to 5. The stopper member is made of metal,
The hatch cover (1) according to claim 6. Furthermore, a cleat bracket is provided on the outer side surface of the skirt (4).
Hatch cover (1) according to any one of the preceding claims. Furthermore, a cleat bracket is provided on the top of the cover body (17).
Hatch cover (1) according to any one of the preceding claims. Comprising at least one side ridge on at least one side of the skirt (4);
The side ridge (11) includes a central long groove (12),
Then, the side sealing member (13) having elasticity protrudes from the central long groove (12) of the side ridge (11) and seals the adjacent hatch cover (1b). A stop member (13) is attached to the central long groove (12).
10. A hatch cover (1) according to any one of the preceding claims. Each side ridge (11, 11b) of the hatch cover (1, 1b) extends parallel to each other when a pair of hatch covers (1, 1b) are positioned adjacent to cover the hatch. Configured to,
A set of hatch covers (1) according to claim 10. Ships,
It consists of one or more hatch covers (1) according to any one of claims 1 to 11,
The vessel comprises one or more hatches,
The hatch is surrounded by the hatch combing (2),
The hatch cover (1) is adapted to correspond to the corresponding one of the hatch combing (2), and the lower sealing member (10) is configured to contact and seal the corresponding hatch combing (2). Being
Hatch cover system. In order to prevent the corresponding skirt (4) of the corresponding hatch cover (1) from moving inward, the corresponding hatch combing (2) is provided with an inner support ridge (19),
The hatch cover system according to claim 12. Outer support to the hatch combing (2) to prevent the skirt (4) of the corresponding hatch cover (1) from moving outward and to maintain the position of the corresponding hatch cover (1) With ridge (3),
The hatch cover system according to claim 12 or 13. The system includes a stopper socket (20) attached to the ship, and the stopper socket (20) and the stopper member (21) are configured to engage with each other, and the corresponding stopper socket (20). Preventing movement of each said skirt (4) in the longitudinal direction,
15. A hatch cover system according to any one of claims 12 to 14 dependent directly or indirectly on claim 6.

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