Strainer, manhole cover set, and method

Abstract

To provide a strainer for preventing dropping of cargo into a bilge well.SOLUTION: A strainer is used for a manhole provided in a cargo hold of a vessel. The strainer includes: a bottom surface part provided with at least one hole; a side surface part extending in an upward direction from an end part of the bottom surface part; and a marginal part extending in a direction perpendicular to a vertical direction from a top end part of the side surface. It is preferable that length of the side surface part in the vertical direction is 30 mm or more and 70 mm or less. It is preferable that ratio of length in the vertical direction in a side surface part to an area of the bottom surface part is 1.8 x 10 -4(1 / m) or more and 4.2×10-4(1 / m) or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a strainer, a manhole cover set and a method. [Background technology]

[0002] Dry bulk carriers transport large amounts of cargo such as wood chips, iron ore, coal, and grains without packaging. The cargo is stored in the ship's cargo holds. The cargo holds are equipped with manholes to allow water and rainwater (also known as bilge) contained in the cargo to be discharged into bilge wells. Burlap, a type of linen cloth, is installed to cover the manholes to prevent the cargo from falling into the bilge wells.

[0003] However, when cargo is loaded or unloaded, the burlap can come off and become mixed with the cargo. On the other hand, if the burlap is lost, the cargo falls into the bilge well and accumulates in the bilge tank. This can cause damage to the pipes and valves when the fallen cargo is discharged through the drain pipe.

[0004] Patent Document 1 discloses a strainer installed in a ballast tank. The strainer can be inserted into and removed from a manhole opening provided in the double-bottom top plate inside the ballast tank. When cargo is being loaded, the manhole opening is watertightly closed with a lid with the strainer attached. The strainer is used to allow seawater to flow through the manhole opening by opening the lid when seawater is to be poured into or discharged from a cargo hold when the tank is empty. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Publication No. 2-097190 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a strainer for preventing cargo from falling into a bilge well. [Means for solving the problem]

[0007] The object of the present invention is to [1] A strainer to be installed in a cargo hold of a ship and used in a manhole for discharging bilge water, the strainer comprising: a bottom surface portion having at least one hole; a side surface portion extending upward from an end of the bottom surface portion; and an edge portion extending in a direction perpendicular to the up-down direction from an upper end of the side surface portion; [2] The strainer according to [1], wherein the length of the side surface in the vertical direction is 30 mm or more and 70 mm or less; [3] The ratio of the vertical length of the side surface to the area of the bottom surface is 1.8 × 10 -4 (1 / m) or more, 4.2 × 10 -4 (1 / m) of the strainer according to [1] or [2]; [4] The strainer according to any one of [1] to [3], wherein the diameter of the hole provided in the bottom surface portion is 3 mm or more and 15 mm or less; [5] The strainer according to any one of [1] to [4], wherein a plurality of holes are provided in the bottom surface portion, and the distance from the center of one of the plurality of holes to the center of an adjacent hole is 15 mm or more and 25 mm or less; [6] The strainer according to any one of [1] to [5], which includes an attachment part for attachment to the manhole, and the attachment part is provided on the edge part or is a member extending from the edge part; [7] A manhole cover set comprising the strainer according to any one of [1] to [6] above and a manhole cover, wherein the manhole cover comprises a cover portion having at least one hole, and the cover portion is capable of covering the bottom portion; [8] A method comprising the step of attaching a strainer having a bottom surface portion with a plurality of holes, a side surface portion extending upward from an end of the bottom surface portion, and an edge portion extending in a direction perpendicular to the up-down direction from the upper end of the side surface portion to a manhole provided in a cargo hold of a ship for discharging bilge water; [9] The method according to [8], further comprising a step of placing a water-permeable planar body on the bottom surface portion;

[10] The method according to [8] or [9], further comprising the step of attaching a manhole cover to the manhole so as to cover the strainer; This can be solved by: [Effects of the Invention]

[0008] According to the present invention, a strainer for preventing cargo from falling into a bilge well can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a manhole according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a view showing the strainer according to the first embodiment of the present invention as viewed from above and below. [Figure 3] FIG. 3 is a view of the strainer according to the first embodiment of the present invention as viewed from left to right. [Figure 4] FIG. 4 is a perspective view of a manhole cover and a strainer according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a front view of the strainer according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a rear view of the strainer according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a plan view of the strainer according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a right side view of the strainer according to the first embodiment of the present invention. [Figure 9]FIG. 9 is a cross-sectional view taken along line AA of the strainer according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a manhole according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a view showing a strainer according to a second embodiment of the present invention as viewed from above and below. [Figure 12] FIG. 12 is a view of a strainer according to a second embodiment of the present invention as viewed from left to right. [Figure 13] FIG. 13 is a perspective view of a manhole cover and a strainer according to the second embodiment of the present invention. [Figure 14] FIG. 14 is a front view of a strainer according to a second embodiment of the present invention. [Figure 15] FIG. 15 is a rear view of the strainer according to the second embodiment of the present invention. [Figure 16] FIG. 16 is a plan view of a strainer according to a second embodiment of the present invention. [Figure 17] FIG. 17 is a right side view of a strainer according to a second embodiment of the present invention. [Figure 18] FIG. 18 is a cross-sectional view taken along line AA of the strainer according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments unless it is contrary to the spirit of the present invention. Furthermore, the description of the effects is one aspect of the effects of the embodiments of the present invention, and is not limited to those described here. In the drawings described below, the same or corresponding components are given the same reference numerals, and redundant description will be omitted.

[0011] In this specification, the terms "forward / backward direction," "left / right direction," and "up / down direction" refer to the forward / backward direction, left / right direction, and up / down direction of a ship. The terms "up / down direction," "left / right direction," and "forward / backward direction" do not necessarily correspond to the up / down direction, left / right direction, and up / down direction of the strainer when in use. Furthermore, in this specification, "a member extending upward" includes cases where the member is parallel to an axis extending in the vertical direction and cases where the member is tilted relative to the axis extending in the vertical direction. In this case, the angle formed between the member and the upward direction is 20 degrees or less.

[0012] Generally, ships, including dry bulk carriers, have multiple cargo holds. In ships, bilge wells are provided near the bottom of the ship on the underside of the cargo holds. The cargo holds of ships, for example, are provided with at least one manhole. The manhole connects the space between the bilge well and the cargo hold. Bilge water, such as water and rainwater contained in the cargo, is discharged into the bilge well through the manhole, which is a drainage outlet provided on the bottom of the cargo hold.

[0013] [First embodiment] [Manhole section] Next, the shape of the manhole portion 10a that forms the manhole according to the first embodiment will be described. Fig. 1 is a perspective view of the manhole portion 10a according to the first embodiment. The manhole portion 10a includes mounting portions 11a to 11d, an edge portion 13, and a side portion 14. The mounting portions 11a to 11d and the edge portion 13 are located below the floor 2 of the cargo hold.

[0014] Mounting portion 11a has a rectangular shape when viewed from above and below. Mounting portion 11a extends forward from a part of the rear edge of the inner side of edge portion 13. The rear end of mounting portion 11a is connected to edge portion 13. A hole 12a is provided near the center of mounting portion 11a. Mounting portion 11c has a structure symmetrical to mounting portion 11a with respect to an axis extending in the left-right direction.

[0015] Mounting portion 11b has a rectangular shape when viewed from above and below. Mounting portion 11b extends rightward from a portion of the inner left side of edge portion 13. The left end of mounting portion 11b is connected to edge portion 13. A hole 12b is provided near the center of mounting portion 11b. Mounting portion 11d has a structure symmetrical to mounting portion 11b with respect to an axis extending in the front-to-rear direction.

[0016] The edge portion 13 has an elliptical ring shape. An opening M is formed by the edge portion 13. The opening M is a manhole that connects the space between the bilge well and the cargo hold. The side portion 14 extends upward from the end of the edge portion 13. The upper end of the side portion 14 is connected to the floor 2. The vertical length of the side portion 14 is the vertical length from the upper main surface of the edge portion 13 or the mounting portions 11a to 11d to the upper main surface of the floor 2.

[0017] [Strainer] Next, a strainer 100a according to a first embodiment will be described. The strainer 100a according to the first embodiment is used in a manhole formed by a manhole portion 10a. The strainer 100a is made of metal such as iron or steel. The strainer 100a is made by processing an iron plate having a thickness of 5 mm, for example.

[0018] Fig. 2 is a top-down view of the strainer 100a according to the first embodiment. Fig. 3 is a left-right view of the strainer 100a according to the first embodiment. As shown in Figs. 2 and 3, the strainer 100a includes a bottom surface portion 110, a side surface portion 120, an edge portion 130, and mounting portions 131a to 131d.

[0019] As shown in Fig. 2, the bottom surface portion 110 has an elliptical shape. More specifically, the shape of the bottom surface portion 110 is formed by linear right and left sides and arc-shaped rear and front sides. If the maximum length of the bottom surface portion 110 in the front-to-rear direction (longitudinal direction) is Ls1, Ls1 is preferably 200 to 1000 mm, and more preferably 300 to 700 mm. In other words, Ls1 is preferably 200 mm or more, and more preferably 300 mm or more. Ls1 is preferably 1000 mm or less, and more preferably 700 mm or less.

[0020] If the maximum length of the bottom surface portion 110 in the left-right direction (short direction) is Ls2, Ls2 is preferably 100 to 500 mm, and more preferably 200 to 420 mm. That is, Ls2 is preferably 100 mm or more, and more preferably 200 mm or more. Ls2 is preferably 500 mm or less, and more preferably 420 mm or less. Ls1 is shorter than the length of the opening M in the front-to-rear direction, and Ls2 is shorter than the length of the opening M in the left-to-right direction.

[0021] Furthermore, if the length in the front-rear direction of the linear right and left sides of the bottom surface portion 110 is Ls1', then Ls1' is preferably 80 to 400 mm, and more preferably 150 to 320 mm. That is, Ls1' is preferably 80 mm or more, and more preferably 150 mm or more. Ls1' is preferably 400 mm or less, and more preferably 320 mm or less.

[0022] The bottom surface portion 110 has an upper main surface and a lower main surface, and is provided with a plurality of holes 140 (for example, holes 140a, 140b, and 140c).

[0023] The diameter of the hole 140 is preferably 3 to 15 mm, and more preferably 7 to 12 mm. That is, the diameter of the hole 140 is preferably 3 mm or more, and more preferably 7 mm or more. Furthermore, the diameter of the hole 140 provided in the bottom surface portion 110 is preferably 15 mm or less, and more preferably 12 mm or less. When the diameter of the hole 140 is 3 mm or more, even if dust passes through the manhole cover and falls onto the bottom surface portion 110, the dust is prevented from clogging the hole 140, and the bilge can pass through to the bilge well. When the diameter of the hole 140 is 15 mm or less, the dust that has fallen onto the bottom surface portion 110 is prevented from falling into the bilge well.

[0024] As shown in FIG. 2, hole 140a is adjacent to holes 140b and 140c. Holes 140a and 140b are aligned in the front-to-rear direction. Holes 140a and 140c are aligned in the left-to-right direction. If the distance from the center of hole 140a to the center of hole 140b is Ls7, Ls7 is preferably 15 to 25 mm, and more preferably 18 to 22 mm. That is, Ls7 is preferably 15 mm or more, and more preferably 18 mm or more. Furthermore, Ls7 is preferably 22 mm or less, and more preferably 25 mm or less. Ls7 can also be applied to the distance from the center of hole 140a to the center of hole 140c.

[0025] 2, the plurality of holes 140 are provided on the entire surface of the bottom surface portion 110. The plurality of holes 140 may be provided on the entire surface of the bottom surface portion 110 except for an area within a predetermined range (for example, 40 mm) from the end of the bottom surface portion 110.

[0026] 3, the side surface portion 120 extends upward from the end of the bottom surface portion 110. The side surface portion 120 has a cylindrical shape that extends in the vertical direction. The side surface portion 120 does not have any holes.

[0027] If the length from the bottom to the top of the side surface portion 120 is Ls6, then Ls6 is preferably 30 to 70 mm, more preferably 40 to 60 mm, and even more preferably 45 to 55 mm. That is, Ls6 is preferably 30 mm or more, more preferably 40 mm or more, and even more preferably 45 mm or more. Furthermore, Ls6 is preferably 70 mm or less, more preferably 60 mm or less, and even more preferably 55 mm or less.

[0028] Ls6 can also be said to be the height of the side surface portion 120. Furthermore, Ls6 is the length in the vertical direction from the lower main surface of the bottom surface portion 110 to the upper main surface of the edge portion 130. Ls6 can also be said to be the depth of the strainer 100.

[0029] The ratio of the length (Ls6) of the side surface portion 120 in the vertical direction to the area of the upper main surface of the bottom surface portion 110 is 1.8×10 -4 ~4.2×10 -4 is preferred, and 2.2 × 10 -4 ~3.8×10 -4 That is, the ratio of Ls6 to the area of the upper main surface of the bottom surface portion 110 is more preferably 1.8×10 -4 It is preferable that the value is 2.2×10 or more. -4 The ratio of Ls6 to the area of the upper main surface of the bottom surface portion 110 is preferably 4.2×10 -4 Preferably, it is 3.8 x 10 or less. -4 It is more preferable that the ratio of Ls6 to the area of the upper main surface of the bottom surface portion 110 is Ls6 / area of the upper main surface of the bottom surface portion 110 (1 / m).

[0030] As shown in Fig. 3, edge portion 130 extends from the upper end of side portion 120 in a direction perpendicular to the up-down direction. As shown in Fig. 2, edge portion 130 has an elliptical ring shape when viewed from above. More specifically, the outer shape of edge portion 130 is formed by linear right and left sides and arc-shaped rear and front sides. The inner shape of edge portion 130 is formed by linear right and left sides and arc-shaped rear and front sides.

[0031] If the maximum length of edge 130 in the front-to-rear direction (longitudinal direction) is Ls3, then Ls3 is preferably 500 mm or more. Ls3 is preferably 800 mm or less. If the maximum length of edge 130 in the left-to-right direction (transverse direction) is Ls4, then Ls4 is preferably 250 mm or more. Ls4 is preferably 500 mm or less.

[0032] Moreover, edge portion 130 has a width extending in the left-right direction or the front-rear direction. As shown in FIG. 2, the width of edge portion 130 is constant. If the width of edge portion 130 is Ls5, Ls5 is preferably 5 to 80 mm, more preferably 10 to 70 mm, and even more preferably 15 to 65 mm. That is, Ls5 is preferably 5 mm or more, more preferably 10 mm or more, and even more preferably 15 mm or more. Ls5 is preferably 80 mm or less, more preferably 70 mm or less, and even more preferably 65 mm or less. When edge portion 130 has a width equal to or greater than a certain value, a gap is less likely to occur between opening M and the end of edge portion 130.

[0033] The mounting portions 131a to 131d are portions for mounting the strainer 100a to the manhole portion 10a. Mounting the strainer 100a to the manhole portion 10a is also referred to as mounting the strainer 100a to the manhole. The mounting portions 131a to 131d are provided on the edge portion 130. A hole is provided in each of the mounting portions 131a to 131d. The hole is provided in the edge portion 130. The diameter of the hole is preferably 10 mm or more. Furthermore, the diameter of the hole is preferably 25 mm or less.

[0034] Attachment portion 131a is located between the outer rear edge and the inner rear edge of edge portion 130. Attachment portion 131c is located between the outer front edge and the inner front edge of edge portion 130. Attachment portion 131b is located between the outer left edge and the inner left edge of edge portion 130. Attachment portion 131d is located between the outer right edge and the inner right edge of edge portion 130.

[0035] When strainer 100a is attached to manhole 10a, mounting portions 131a and 11a overlap when viewed from above. Furthermore, the hole in mounting portion 131a overlaps hole 12a when viewed from above. Furthermore, the length from the hole in mounting portion 131a to the hole in mounting portion 131c is within a predetermined range (e.g., 5 mm) of the length from hole 12a to hole 12c. Furthermore, the length from the hole in mounting portion 131b to the hole in mounting portion 131d is within a predetermined range of the length from hole 12b to hole 12d. Therefore, when strainer 100a is attached to manhole 10a, the hole in mounting portion 131b overlaps hole 12b, the hole in mounting portion 131c overlaps hole 12c, and the hole in mounting portion 131d overlaps hole 12d when viewed from above.

[0036] [Manhole cover] Next, a manhole cover 20a according to the first embodiment will be described. Fig. 4 is a perspective view of the manhole cover 20a and strainer 100a according to the first embodiment of the present invention. The manhole cover 20a is made of a metal such as iron or steel. The manhole cover 20a is made by processing, for example, an iron plate with a thickness of 5 mm. The manhole cover 20a may be made of the same material as the strainer 100a.

[0037] The maximum length of manhole cover 20a in the front-to-rear direction is longer than Ls1. Also, the maximum length of manhole cover 20a in the front-to-rear direction may be the same as or longer than Ls3. The maximum length of manhole cover 20a in the left-to-right direction is longer than Ls2. Also, the maximum length of manhole cover 20a in the left-to-right direction may be the same as or longer than Ls4.

[0038] The manhole cover 20a includes a cover portion 30. The cover portion 30 is capable of covering the bottom surface portion 110. The cover portion 30 includes an upper main surface and a lower main surface, and has an elliptical shape. More specifically, the shape of the cover portion 30 is formed by linear right and left sides and arc-shaped rear and front sides. When viewed from above and below, the shape of the cover portion 30 substantially matches the outer shape of the edge portion 130. The cover portion 30 includes handle portions 21a, 21b and attachment portions 22a to 22d.

[0039] Handles 21a and 21b are provided with oval holes extending in the left-right direction. Handles 21a and 21b are used by an operator when removing manhole cover 20a. Handle 21a is located in the rear region of cover part 30, and handle 21b is located in the front region of cover part 30. Handles 21a and 21b are located in the center of cover part 30 in the left-right direction.

[0040] A hole is provided in each of the mounting portions 22a to 22d. The diameter of the hole is preferably 8 mm or more. The diameter of the hole is preferably 25 mm or less. Mounting portion 22a is provided near the center of the rear side of manhole cover 20a. Mounting portion 22b is provided near the center of the left side of manhole cover 20a. Mounting portion 22c is provided near the center of the front side of manhole cover 20a. Mounting portion 22d is provided near the center of the right side of manhole cover 20a.

[0041] When manhole cover 20a and strainer 100a are attached to manhole portion 10a, mounting portion 22a, mounting portion 131a, and mounting portion 11a overlap when viewed from above. Furthermore, the hole in mounting portion 22a, the hole in mounting portion 131a, and hole 12a overlap when viewed from above. Furthermore, when manhole cover 20a and strainer 100a are attached to manhole portion 10a, the hole in mounting portion 22b, the hole and hole 12b in mounting portion 131b, the hole in mounting portion 22c, the hole and hole 12c in mounting portion 131c, and the hole in mounting portion 22d, the hole and hole 12d in mounting portion 131d overlap when viewed from above.

[0042] The cover part 30 is provided with a plurality of holes 23 (for example, holes 23a and 23b). The diameter of the holes 23 is preferably 15 to 25 mm, and more preferably 18 to 22 mm, similar to the hole 140. The plurality of holes 23 are aligned in the front-rear and left-right directions. The distance from the center of a hole 23 to the center of an adjacent hole 23 is preferably 15 to 25 mm, and more preferably 18 to 22 mm, similar to the hole 140.

[0043] [Instructions for use] Next, a method of using the manhole cover 20a and the strainer 100a will be described with reference to Fig. 4. Fig. 4 shows a state in which the strainer 100a is attached to the manhole portion 10a.

[0044] First, a method for attaching manhole cover 20a and strainer 100a to manhole portion 10a will be described. An operator places strainer 100a on manhole portion 10a by overlapping mounting portions 131a-131d with mounting portions 11a-11d. Next, an operator places manhole cover 20a on strainer 100a by overlapping mounting portions 22a-22d with mounting portions 131a-131d. At this time, the holes in mounting portions 22a-22d, the holes in mounting portions 131a-131d, and holes 12a-12d all overlap when viewed from above and below. Then, an operator inserts and fastens bolts into mounting portions 22a-22d, thereby attaching strainer 100a and manhole cover 20a to the manhole formed by manhole portion 10a.

[0045] 4, when strainer 100a is placed on manhole portion 10a, opening M is covered by edge portion 130. As a result, strainer 100a prevents dust that has fallen from manhole cover 20a from falling through the gap between edge portion 130 and edge portion 130.

[0046] Next, a method for removing the manhole cover 20a and the strainer 100a from the manhole portion 10a will be described. An operator can easily remove the manhole cover 20a from the manhole portion 10a and the strainer 100a by removing the bolts fixed to the mounting portions 22a to 22d and using the handle portions 21a and 21b.

[0047] Next, we will explain how to use the manhole cover 20a and strainer 100a. Before loading cargo, workers attach the manhole cover 20a and strainer 100a to the manhole section 10a. By providing the strainer 100a below the manhole cover 20a, the strainer 100a can catch dust that falls from the manhole cover 20a. It also allows bilge water to be discharged into the bilge well.

[0048] After unloading the cargo, the worker removes the manhole cover 20a from the manhole portion 10a. This allows the worker to collect the dust that has accumulated on the strainer 100a. The worker may remove the manhole cover 20a and the strainer 100a from the manhole portion 10a and remove the dust that has accumulated on the strainer 100a.

[0049] 4, the operator may place a sheet body 200 on the bottom surface portion 110 and use a strainer 100a. The sheet body 200 has water permeability. The sheet body 200 may be made of, for example, linen cloth, cotton cloth, nonwoven fabric, sponge, or the like. The sheet body 200 may be a disposable member or a reusable member. The sheet body 200 is not particularly limited as long as it can cover the holes 140 provided in the bottom surface portion 110. For example, the size of the sheet body 200 is such that it can cover the upper main surface of the bottom surface portion 110.

[0050] By placing the sheet-shaped body 200 on the bottom surface portion 110, the sheet-shaped body 200 catches dust that has fallen from the manhole cover 20a. In addition, because the sheet-shaped body 200 is water-permeable, it discharges bilge water into a bilge well. By removing the sheet-shaped body 200 from the strainer 100a, an operator can collect the dust that has accumulated in the strainer 100a.

[0051] FIG. 5 is a front view of the strainer 100a according to the first embodiment of the present invention. FIG. 6 is a rear view of the strainer 100a according to the first embodiment of the present invention. FIG. 7 is a plan view of the strainer 100a according to the first embodiment of the present invention. FIG. 8 is a right side view of the strainer 100a according to the first embodiment of the present invention. FIG. 9 is an AA cross-sectional view of the strainer 100a according to the first embodiment of the present invention. The bottom view of the strainer 100a is symmetrical to the plan view of the strainer 100a. The left side view of the strainer 100a is symmetrical to the right side view of the strainer 100a.

[0052] [Second embodiment] [Manhole section] Next, the shape of manhole portion 10b forming a manhole according to the second embodiment will be described. Fig. 10 is a perspective view of manhole portion 10b according to the second embodiment. Manhole portion 10b differs from manhole portion 10a in that it has a plurality of convex portions 15 (e.g., convex portions 15a, 15f, 15l, 15p, etc.) instead of mounting portions 11a-11d and holes 12a-12b, and in that it has sealing portion 16.

[0053] As shown in FIG. 10, the manhole portion 10b has a plurality of convex portions 15 (convex portions 15a to 15t). The convex portion 15a is a rod-shaped member extending upward. The convex portion 15a is, for example, a bolt. The convex portions 15 are arranged on the edge portion 13 at predetermined intervals. In the second embodiment, the convex portions 15a, 15f, 15l, and 15p function as attachment portions for attaching the strainer 100b and manhole cover 20b described below.

[0054] The sealing portion 16 is installed on the edge portion 13. When viewed from above, the sealing portion 16 has an elliptical ring shape. The width of the sealing portion 16 is equal to or less than the width of the edge portion 13. The sealing portion 16 comes into contact with the strainer 100b or manhole cover 20b attached to the manhole portion 10b. The sealing portion 16 comes into contact with other components and prevents water from entering through gaps between the sealing portion 16 and other components.

[0055] [Strainer] Next, a strainer 100b according to a second embodiment will be described. The strainer 100b according to the second embodiment is used in a manhole formed by the manhole portion 10b.

[0056] Fig. 11 is a top-down view of a strainer 100b according to a second embodiment of the present invention. Fig. 12 is a left-right view of the strainer 100b according to the second embodiment of the present invention. The strainer 100b differs from the strainer 100a in that the attachment portions 131a-131d are members extending from the edge portion 130.

[0057] In the second embodiment, as shown in FIG. 11 , the attachment portion 131a extends from an end of the edge portion 130 to the outside of the edge portion 130. Specifically, the attachment portion 131a extends rearward from the rear edge of the outer side of the edge portion 130. The attachment portion 131a has a rectangular shape when viewed from above and below. If the length of the attachment portion 131a in the front-to-rear direction is Ls9, Ls9 is preferably 40 to 80 mm, and more preferably 50 to 70 mm. In other words, Ls9 is preferably 40 mm or more, and more preferably 50 mm or more. Ls9 is preferably 80 mm or less, and more preferably 70 mm or less. Ls9 is shorter than the width of the edge portion 13.

[0058] If the length of the mounting portion 131a in the left-right direction is Ls10, then Ls10 is preferably 30 to 70 mm, and more preferably 40 to 60 mm. That is, Ls10 is preferably 30 mm or more, and more preferably 40 mm or more. Ls10 is preferably 70 mm or less, and more preferably 60 mm or less.

[0059] The mounting portion 131a is provided with one hole 132a. In the second embodiment, the diameter of the hole 132a is not particularly limited as long as it is larger than the diameter of the convex portion 15. The diameter of the hole 132a is preferably 15 mm or more. Also, the diameter of the hole 132a is preferably 30 mm or less.

[0060] In the second embodiment, the attachment portion 131b extends from an end of the edge portion 130 to the outside of the edge portion 130. Specifically, the attachment portion 131b extends leftward from the outer left side of the edge portion 130. The attachment portion 131b has a rectangular shape when viewed from above and below. The attachment portion 131b has a shape obtained by rotating the attachment portion 131a by 90 degrees to the right. Therefore, the length of the attachment portion 131b in the front-to-rear direction can be considered to be Ls10, and the length in the left-to-right direction can be considered to be Ls9.

[0061] 11, the mounting portion 131c has a structure symmetrical to the mounting portion 131a with respect to an axis extending in the left-right direction, and the mounting portion 131d has a structure symmetrical to the mounting portion 131b with respect to an axis extending in the front-rear direction.

[0062] When strainer 100b is attached to manhole 10b, convex portion 15a is inserted into hole 132a. Furthermore, the length from hole 132a to hole 132c is within a predetermined range (for example, within 5 mm) of the length from convex portion 15a to convex portion 15l. Furthermore, the length from hole 132b to hole 132d is within a predetermined range of the length from convex portion 15f to convex portion 15p. Therefore, when strainer 100b is attached to manhole 10b, convex portion 15f is inserted into hole 132b, convex portion 15l is inserted into hole 132c, and convex portion 15p is inserted into hole 132d.

[0063] The number of mounting portions 131 is preferably 2 to 8, more preferably 3 to 6, and even more preferably 4. In other words, the number of mounting portions 131 is preferably 8 or less, and more preferably 6 or less. Furthermore, the number of mounting portions 131 is preferably 2 or more, and more preferably 3 or more.

[0064] When the number of mounting portions 131 is four, the mounting portions 131 are arranged symmetrically with respect to axes extending in the front-rear and left-right directions, as shown in Fig. 11. When viewed from above and below, the mounting portions 131 may be arranged on a first line including the center point of the strainer 100b and on a second line including the center point and symmetrical with respect to the first line and the axis extending in the front-rear or left-right directions.

[0065] The strainer 100b is attached to the manhole portion 10b by inserting the convex portions 15a, 15f, 15l, and 15p of the manhole portion 10b into the holes 132a to 132d. The amount of bilge water discharged through the strainer 100b is less than the amount of ballast water discharged into the ballast tank. Therefore, by providing attachment portions 131a to 131d corresponding to some of the convex portions 15, an operator can easily install the strainer 100b in the manhole portion 10b while maintaining the strength of the strainer 100b when attached to the manhole portion 10b. Furthermore, there is no need to provide all of the holes 132 corresponding to the convex portions 15a to 15t in the strainer 100b, which reduces the burden of manufacturing the strainer 100b.

[0066] [Manhole cover] Next, a manhole cover according to a second embodiment will be described. Figure 13 10 is a perspective view of a manhole cover 20b and a strainer 100b according to a second embodiment of the present invention. The manhole cover 20b differs from the manhole cover 20a in the following points. The manhole cover 20b further includes an edge portion 24 and a side portion 25. The mounting portion 22 is included in the edge portion 24, not in the cover portion 30. The number of attachment portions 22 is different.

[0067] The side surface portion 25 extends downward from the end of the cover portion 30. The lower end of the side surface portion 25 is connected to the edge portion 24. The vertical length of the side surface portion 25 is preferably 15 to 50 mm, and more preferably 25 to 40 mm. In other words, the vertical length of the side surface portion 25 is preferably 15 mm or more, and more preferably 25 mm or more. The vertical length of the side surface portion 25 is preferably 50 mm or less, and more preferably 40 mm or less. The vertical length of the side surface portion 25 is preferably shorter than the height of the manhole portion 10b.

[0068] The edge portion 24 has an elliptical ring shape when viewed from above and below. The edge portion 24 has an upper main surface and a lower main surface. The lower main surface of the edge portion 24 contacts the sealing portion 16, the attachment portion 131, or the edge portion 130.

[0069] The edge portion 24 includes mounting portions 22a to 22t. A hole is provided in each of the mounting portions 22a to 22t. The diameter of the hole is preferably, for example, 15 mm or more. Furthermore, the diameter of the hole is preferably, for example, 30 mm or less. The mounting portions 22a to 22t are provided at positions corresponding to the convex portions 15a to 15t, respectively. Specifically, the distance from the center of the hole provided in mounting portion 22a to the center of the hole provided in mounting portion 22b is the same as the distance from the center of convex portion 15a to the center of convex portion 15b.

[0070] [Instructions for use] Next, a method of using the manhole cover 20b and the strainer 100b will be described with reference to Fig. 13. Fig. 13 shows a state in which the strainer 100b is attached to the manhole portion 10b.

[0071] First, a method for attaching manhole cover 20b and strainer 100b to manhole portion 10b will be described. An operator inserts convex portions 15a, 15f, 15l, and 15p into holes 132a to 132d and places strainer 100b on manhole portion 10b. Next, an operator inserts convex portions 15a to 15t into holes provided in mounting portions 22a to 22t and places manhole cover 20b on strainer 100b. By tightening nuts onto each of convex portions 15a to 15t from above manhole cover 20b, strainer 100b and manhole cover 20b can be attached to the manhole formed by manhole portion 10b.

[0072] 13, when strainer 100b is placed on manhole portion 10b, opening M is covered by edge portion 130. As a result, strainer 100b prevents dust that has fallen from manhole cover 20b from falling through the gap between edge portion 130 and edge portion 130.

[0073] A method for removing manhole cover 20b and strainer 100b from manhole portion 10b will be described below. An operator can easily remove manhole cover 20b from manhole portion 10b and strainer 100b by removing the nuts that fasten each of convex portions 15a to 15t and using handle portions 21a and 21b.

[0074] The strainer 100b and the manhole cover 20b can achieve the same effects as the strainer 100a and the manhole cover 20a. The worker may place the sheet body 200 on the bottom surface portion 110 and use the strainer 100b.

[0075] FIG. 14 is a front view of a strainer 100b according to a second embodiment of the present invention. FIG. 15 is a rear view of the strainer 100b according to the second embodiment of the present invention. FIG. 16 is a plan view of the strainer 100b according to the second embodiment of the present invention. FIG. 17 is a right side view of the strainer 100b according to the second embodiment of the present invention. FIG. 18 is an AA cross-sectional view of the strainer 100b according to the second embodiment of the present invention. The bottom view of the strainer 100b is symmetrical to the plan view of the strainer 100b. The left side view of the strainer 100b is symmetrical to the right side view of the strainer 100b.

[0076] [Other embodiments] The strainer according to one embodiment of the present invention is not limited to strainers 100a and 100b, and can be modified within the scope of the gist thereof. The structures of strainers 100a and 100b may be combined in any desired manner. The manhole cover according to one embodiment of the present invention is not limited to manhole covers 20a and 20b, and can be modified within the scope of the gist thereof. The structures of manhole covers 20a and 20b may be combined in any desired manner. The following structures may be combined in any desired manner.

[0077] In addition, strainers 100a and 100b may be used in one ship. For example, strainer 100a is used for a manhole formed by manhole portion 10a in a first cargo hold, and strainer 100b is used for a manhole formed by manhole portion 10b in a second cargo hold.

[0078] It is sufficient that at least one hole 140 is provided in the bottom surface portion 110. The bottom surface portion 110 may have a shape that is curved downward or upward.

[0079] The bottom surface portion 110 may have a circular or rectangular shape when viewed from above and below. The edge portion 130 may have a circular or rectangular ring shape when viewed from above and below. The shape of the bottom surface portion 110 or the edge portion 130 can be designed appropriately depending on the shape of the edge portion 13 of the manhole portion to which it is attached.

[0080] Note that one or more holes may be provided in the side surface portion 120. The diameter of the hole 140 can be applied to the diameter of the hole provided in the side surface portion 120. The distance between the centers of adjacent holes 140 can be applied to the distance between the centers of adjacent holes provided in the side surface portion 120.

[0081] The diameter of hole 140 may be smaller than the diameter of hole 23. This allows the strainer to suitably prevent dust that has fallen through hole 23 from falling into the bilge well. Holes 140a and 140b may be arranged diagonally, such as toward the front right or front left.

[0082] In strainer 100b, instead of holes provided in mounting portion 131, notches may be provided that extend from near the center of mounting portion 131 in a direction perpendicular to the direction in which mounting portion 131 extends from edge portion 130. In strainer 100b, the shape of mounting portion 131 is not limited to a rectangular shape, and may be a circular shape, an elliptical shape, a square shape, a trapezoidal shape, a polygonal shape, or the like. In strainer 100b, mounting portion 131 may be provided with two or more holes. In this case, the holes are provided in mounting portion 131 so as to correspond to the positions of convex portions 15 that are inserted into the holes.

[0083] It is sufficient that at least one hole 23 is provided in the cover portion 30. Furthermore, when holes are provided in the handle portions 21a and 21b, the cover portion 30 does not necessarily need to have a hole 23.

[0084] Although the embodiment in which holes are provided in the handle portions 21a and 21b has been described, protrusions or handles may be provided on the handle portions 21a and 21b instead of holes. Furthermore, the cover portion 30 may include either the handle portion 21a or 21b. The positions of the handle portions 21a and 21b on the cover portion 30 are not particularly limited.

[0085] Note that manhole cover 20a may have side portions and edge portions, similar to manhole cover 20b. In this case, attachment portions 22a to 22d are provided on the edge portions. Note that manhole cover 20b does not necessarily have side portions 25.

[0086] When the strainers 100a, 100b and the manhole covers 20a, 20b are attached to the manhole portions 10a, 10b, it is preferable that the upper main surface of the cover portion 30 is at the same height as the floor 2 in the vertical direction or within a predetermined range (for example, within 30 mm). This prevents the manhole cover from interfering with the operation of heavy machinery when loading and unloading cargo.

[0087] In the above, the holes may be through-holes, and the shape of the holes may be not only circular, but also elliptical, semicircular, triangular, rectangular, or polygonal.

[0088] According to the present invention, the strainer has a bottom surface with at least one hole, which prevents cargo loaded in the cargo hold from falling into the bilge well. Furthermore, the use of the strainer eliminates the need for burlap, preventing other substances from being mixed into the cargo. Furthermore, the length of the side surface of the strainer in the vertical direction is 30 mm or more and 70 mm or less, which prevents cargo from falling while ensuring water permeability through the bilge. Furthermore, the strainer is easy to clean. It can also be used in cases where the bilge well is shallow. In this case, to improve the cleanability of the strainer, the ratio of the vertical length of the side surface to the area of the bottom surface is set to 1.8 x 10 -4 (1 / m) or more, 4.2 × 10 -4 It is preferable that the thickness is (1 / m) or less.

[0089] In addition, for the purpose of improving the permeability of the bilge and preventing cargo from falling, it is preferable that the diameter of the holes provided in the bottom portion is 3 mm or more and 15 mm or less, and the distance from the center of one of the multiple holes to the center of an adjacent hole is 15 mm or more and 25 mm or less. In this case, the strength of the strainer can be maintained.

[0090] According to the present invention, the strainer has an attachment portion for attachment to the manhole, so the strainer can be attached to the manhole. According to the present invention, the cover portion of the manhole cover can cover the bottom portion, so cargo can be more effectively prevented from falling. According to the present invention, a water-permeable sheet-shaped body is placed on the bottom portion, so cargo can be more effectively prevented from falling and the strainer can be easily cleaned. [Explanation of symbols]

[0091] 2: Floor 10a, 10b: Manhole section 11a to 11d: Mounting section 12a~12d: Hole 13: Edge 14: Side part 15a~15t: Convex part 16: Sealing part 20a, 20b: Manhole cover 30: Cover part 21a, 21b: Handle portion 22, 22a to 22t: Mounting portion 23, 23a, 23b: Hole 24: Edge 25: Side part 100a, 100b: strainer 110: bottom surface 120: side surface 130: Edge portion 131a to 131d: Mounting portion 132a to 132a: Hole 140, 140a, 140b, 140c: hole 200: Planar body

Claims

1. A strainer for use in a manhole installed in a cargo hold of a ship for discharging bilge water, a bottom surface portion having at least one hole; a side surface portion extending upward from an end of the bottom surface portion; an edge portion extending in a direction perpendicular to the up-down direction from the upper end of the side surface portion; A strainer.

2. 2. The strainer according to claim 1, wherein the length of the side surface in the vertical direction is 30 mm or more and 70 mm or less.

3. The ratio of the length of the side surface portion in the vertical direction to the area of the bottom surface portion is 1.8 × 10 －４ (1 / m) or more, 4.2 x 10 －４ 3. The strainer according to claim 1, wherein the strainer has a cross section of 1 / m or less.

4. 3. The strainer according to claim 1, wherein the diameter of the holes provided in the bottom portion is 3 mm or more and 15 mm or less.

5. A plurality of holes are provided in the bottom surface portion, 3. The strainer according to claim 1, wherein the distance from the center of one of the plurality of holes to the center of an adjacent hole is 15 mm or more and 25 mm or less.

6. a mounting portion for mounting to the manhole Equipped with The strainer according to claim 1 or 2, wherein the attachment portion is a member provided on the edge portion or extending from the edge portion.

7. A manhole cover set comprising the strainer according to claim 1 or 2 and a manhole cover, The manhole cover, a cover portion having at least one hole therein; Equipped with A manhole cover set, wherein the cover portion is capable of covering the bottom portion.

8. a step of attaching a strainer having a bottom surface portion provided with a plurality of holes, a side surface portion extending upward from an end of the bottom surface portion, and an edge portion extending in a direction perpendicular to the up-down direction from an upper end of the side surface portion to a manhole provided in a cargo hold of a ship for discharging bilge water; A method having the following.

9. placing a water-permeable sheet-like body on the bottom surface portion; 9. The method of claim 8, comprising:

10. attaching a manhole cover to the manhole so as to cover the strainer; 10. The method of claim 8 or 9, comprising:

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