KR20160143998A - Grating, assembly of the grating and, manufacturing methods of the assembly - Google Patents

Abstract

A grating according to the present invention comprises: a support part which is formed by vertically bending the edge part of a metal plate to support a load; and multiple through holes formed on the inner side of the edge of the metal plate. Therefore, the present invention simplifies the manufacturing process of the grating and improves productivity compared with a conventional grating having a bearing bar and a cross bar as the grating can be manufactured through a non-welding method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grating assembly, a grating assembly including the grating assembly, and a method of manufacturing the grating assembly.

More particularly, the present invention relates to a grating having a structure in which a rim of a metal plate is bent and supported vertically and a plurality of through holes are formed inside a rim, The grating manufacturing process is simplified and productivity is improved because it can be manufactured in a non-bonded manner without a cross bar. The present invention also relates to a grating assembly including such a grating and a method of manufacturing the same.

Generally, a grating is widely used as a cover for a rainwater drainage channel installed in a road, a residential complex, a subway, etc., and usually includes a plurality of rectangular gratings.

1, the grating 1 includes an end bar 2 forming a rectangle, a plurality of bay ring bars 3 provided inside the end bar 2, and a cross bar 4 do.

The baying bar 3 supports most of the load applied to the grating 1, and a plurality of the baying bars 3 are arranged parallel to each other at equal intervals. Both ends of the bearing bar 3 are joined to the end bar 2 by welding or the like.

The cross bar 4 is installed at the upper end of the bearing bar 3 so as to be perpendicular to the bearing bar 3 and is welded to the bearing bar 3 and the end bar 2. [ The cross bar (4) serves to maintain the interval of the bearing bar (3).

As described above, since the bearing bar 3 is welded to the end bar 2 and the cross bar 4 is welded to the bearing bar 3 and the end bar 2, Many welding tasks are required. However, there is a problem that the quality of the welding depends on the skill level of the worker, so that the quality of the product may deviate significantly.

In addition, there is a problem that it takes a lot of time to manufacture and weld the end bar 2, the bearing bar 3, and the cross bar 4 respectively.

On the other hand, the grating 1 has a plurality of rectangular holes formed by the cross bar 4 and the bearing bar 3, and the odor is raised through such holes.

However, since the rectangular hole is a passage through which rainwater is moved to the drainage duct (collecting and draining passage), it must be kept open, and the fact that the rectangular hole must be sealed for the odor blocking collides with each other, Blocking is not easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a grating capable of ensuring uniformity of product quality because it can be manufactured in a non-bonded manner.

Another object of the present invention is to provide a grating which can shorten the manufacturing process and the working time because the bearing bar 3 and the cross bar 4 are not required, and thus the productivity can be increased.

Another object of the present invention is to provide a grating that can be made by appropriately adjusting the width W of the grating and / or the length L of the grating, the height H of the support, and the thickness of the metal plate depending on the magnitude of the applied load .

It is still another object of the present invention to provide a grating capable of efficiently filtering bad odors while discharging rainwater to a house drainage well.

It is a further object of the present invention to provide a grating assembly of such a grating.

It is still another object of the present invention to provide a method of manufacturing the grating assembly.

The present invention includes a grating that solves the above problems, a grating assembly formed by the grating, and a method of manufacturing the grating assembly. Meanwhile, the grating assembly is formed by horizontally joining gratings to cover a certain area such as a drainage path.

The grating according to the present invention includes a support 30 formed by vertically bending a rim portion of a flat metal plate P. A plurality of through holes (12) are formed in the metal plate inside the frame, and a fastening hole (32) is formed in the support portion (30). The through hole 12 is a hole through which the storm passes, and the fastening hole 32 is a hole for engagement with a neighboring grating.

In the present invention, the support portion 30 supports a load acting on the grating. Therefore, the bearing bar 3 for supporting the load and the cross bar 4 for maintaining the gap between the bearing bars 3 are not required. Thus, the grating may be made without welding.

The grating assembly according to the present invention is constructed such that such gratings are coupled to each other in the horizontal direction.

Reinforcing bars 40 and 40a for supporting the load may be provided between the supporting portions 30 at the connection portion with the neighboring gratings. Specifically, the fastening member 36 is provided so as to penetrate through the two support portions 30 and the reinforcing bars 40 and 40a, thereby connecting neighboring gratings and simultaneously increasing the load bearing capacity.

And the inclined portion 14 may be formed on the through hole 12 so as to face downward. The inclined portion 14 has a larger diameter than the upper end and the inclined portion 14 may be provided with an opening and closing member 400 or 500 for opening and closing the through hole 12. [

The opening and closing members 400 and 500 include a fastening part 410 having a hole 412 fastened to the slant part 14; A stopper 420 capable of rotating with respect to the fastening part 410; And the stopper portion 420 and the stopper portion 420 so that the stopper portion 420 and the stopper portion 420 are rotatable and the stopper portion 420 is formed integrally with the stopper portion 410 and the stopper portion 420, And a connection part 430 for providing an elastic restoring force for returning to the home position.

At this time, it is preferable that the inner circumferential surface of the hole 412 is formed as a ramp which mates with the inclined portion 14.

The stopper 420 is rotated downward by the load of the upper storey to open the through hole 12 and is returned to the original position by the elastic restoring force when the storm is removed.

Meanwhile, in the present invention, the opening and closing member for opening and closing the through hole 12 can be variously implemented. For example, the opening and closing member 600 includes an engaging portion 610; A coupling means 620 fastened to the coupling portion 610 to couple the opening and closing member 600 to the grating; A support portion 630 formed to extend outwardly from the engaging portion 610; And a stopper 640 formed on the upper portion of the support portion 630. [

The first engaging hole 15 is formed in the grating and the second engaging hole 615 is formed in the engaging portion 610 so that the engaging means 620 penetrates the first and second engaging holes 15 and 615 Respectively.

The support portion 630 provides a resilient restoring force so that the stopper portion 640 can provide a supporting force to seal the through hole 12 and return to the original position when the stopper portion 640 is rotated and opened.

The head portion of the fastening means 620 further protrudes above the upper surface of the grating to provide a slip prevention function.

In addition, the opening and closing member 600 may further include a guide portion 650. The guide portion 650 extends outwardly from the engaging portion 610 on both sides of the support portion 630 along each support portion 630. The guide portion 650 guides and supports the support portion 630 so that the guide portion 650 does not warp sideways when the support portion 630 rotates.

The method of manufacturing a grating assembly according to another aspect of the present invention includes the steps of: (a) vertically bending a rim of a flat metal plate P to form a support 30; (b) forming a plurality of small holes (11) by first punching the metal sheet material inside the rim; And (c) punching the small holes 11 to form through holes 12 having a diameter larger than that of the small holes 11.

In the step (a), the metal plate material has a rectangular shape, and neighboring supporting portions 30 can be coupled to each other by the connecting member 34 and the fastening member 36 having a cross-sectional shape.

As an alternative to the above method, the step (a) may also form a support 30 by drawing a metal sheet material in a rectangular shape.

The present invention has the following effects.

1. Uniformity of product quality can be ensured because it can be manufactured in a non-bonded manner.

2. Since the bearing bar (3) and the cross bar (4) are not required, it is possible to shorten the manufacturing process and the working time, thereby increasing the productivity.

3. It can be made by adjusting the width (W) and / or the length (L) of the grating, the height (H) of the support, and the thickness of the metal plate appropriately according to the size of the load acting.

4. Effluent can be effectively cut off while discharging rainwater to the drainage well.

5. Provide a grating assembly of the above-described grating.

6. Provide a method of making the grating assembly as described above.

1 is a perspective view showing a grating according to the prior art;
2 is a perspective view showing a grating according to a first embodiment of the present invention;
3 is a plan view showing a metal plate for making the grating of FIG. 2;
4 is a plan view showing the grating of FIG. 2 connected and first punched.
5 is a plan view showing the grating assembly of FIG. 4 being secondarily punched.
Figure 6 (a) is a plan view showing a reinforcing bar provided in the grating assembly of Figure 4;
6 (b) is a front view showing a reinforcing bar.
7 (a) is a plan view showing a modified example of a reinforcing bar.
7 (b) is a front view showing a modification of the reinforcing bar.
8 is a sectional view taken along line AA 'of FIG. 5;
9 is a sectional view taken along the line BB 'of FIG.
10 is a cross-sectional view showing the grating assembly being installed in a drainage channel;
11 is a plan view showing another metal plate for making a grating.
12 is a plan view showing a drawing process of the metal plate material of Fig.
13 is a sectional view taken along line CC 'in Fig. 12;
14 is a sectional view taken along the line DD 'in Fig. 12;
15 is a plan view showing an assembly made by connecting the gratings to each other;
16 is a sectional view taken along the line EE 'in Fig. 15;
17 is a cross-sectional view taken along line FF 'in Fig. 15;
18 is a plan view showing an assembly in which gratings having elliptical through holes are connected to each other.
19 (a) is a plan view showing an opening and closing member usable in the present invention.
19 (b) is a cross-sectional view taken along line GG 'in Fig. 19 (a).
Fig. 19 (c) is a right side view of Fig. 19 (a).
Fig. 20 (a) is a cross-sectional view showing that the opening and closing member of Fig. 19 (a) is fastened to the grating, showing that the opening and closing member closes the through hole;
Fig. 20 (b) is a cross-sectional view showing the opening and closing member of Fig. 19 (a) fastened to the grating, showing that the opening and closing member opens the through hole;
21 (a) is a plan view showing another opening and closing member that can be used in the present invention.
Fig. 21 (b) is a right side view of Fig. 21 (a). Fig.
21 (c) is a cross-sectional view taken along line HH 'in Fig. 21 (a).
Fig. 22 (a) is a cross-sectional view showing that the opening and closing member of Fig. 21 (a) is fastened to the grating, showing that the opening and closing member seals the through hole;
22 (b) is a cross-sectional view showing that the opening and closing member of Fig. 21 (a) is fastened to the grating, showing that the opening and closing member opens the through hole.
23 (a) is a plan view showing another opening and closing member that can be used in the present invention.
Fig. 23 (b) is a front view of Fig. 23 (a). Fig.
Fig. 23 (c) is a front view showing that the opening and closing member of Fig. 23 (b) is turned and opened.
23 (d) is an enlarged view of a portion M in FIG. 23 (a).
24 is a plan view showing a grating in which the opening and closing member of Fig. 23 (a) can be installed; Fig.
25 is a plan view showing that the opening and closing member of Fig. 23 (a) is installed in a grating.
Fig. 26 is a longitudinal sectional view of Fig. 25, showing that the left sealing member is blocking the through-hole and the right sealing member is opened; Fig.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely examples of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

FIG. 2 is a perspective view showing a grating according to a first embodiment of the present invention, and FIG. 3 is a plan view showing a metal plate used for manufacturing a grating.

Referring to the drawings, a grating 100 includes a body portion 10 and a support portion 30 formed at an edge of the body portion 10.

The grating 100 is formed by bending a flat metal plate P while the rim of the metal plate P is vertically bent to become the support portion 30 and the inside of the support portion 30 becomes the main body portion 10 . 3, after four vertex portions of the rectangular metal plate P are cut off, the rim portion is vertically bent to become the support portion 30, and the inside of the support portion 30 is folded into the main body portion 10 ). The portion indicated by "+" in FIG. 3 represents a point where punching is performed in the subsequent machining.

A plurality of through holes 12 are formed in the main body 10. The through hole 12 is a hole through which rainwater or the like passes and is formed by the first and second punching operations. The punching operation will be described below.

A plurality of fastening holes 32 are formed in the support 30. The fastening holes 32 are used to couple the two supports 30 to each other or to couple neighboring gratings 100 to each other.

Specifically, in order to engage the two supporting portions 30 bent at right angles to each other, a connecting member 34 having a cross-sectional shape is mounted on the inner surface of the supporting portion 30, 36, rivet, or bolt).

After the grating 100 is disposed so that the support portions 30 of the neighboring gratings 100 are brought into contact with each other in order to join the neighboring gratings 100, a fastening member 36 is attached to the fastening holes 32 Thereby joining the grating 100 to each other.

As such, since the grating 100 can be made only of bending and fastening members 36 (rivets or bolts), there is no need for welding, and therefore, the quality of the product is uniform and reliable. As described in " Technology as a Background of the Invention ", the quality of the product depends on the skill level of the worker, so that the conventional grating 1 has a problem of a large quality deviation.

On the other hand, when the gratings 100 are coupled to each other, a welding method may be used instead of or in combination with the fastening member 36. [

The main body 10 receives a load of a pedestrian, a vehicle or the like passing over the grating 100, and transfers the load to the supporting portion 30. [ Therefore, as shown in FIGS. 4 and 5, when the grating 100 is connected to each other, the smaller the width W and the length L of the main body 10, the larger the load can be supported The larger the height H of the support portion 30 is, the larger the load can be supported. It goes without saying that the larger the thickness of the metal plate P, the larger the load can be supported.

The width (W) is preferably 50 mm or more and 1500 mm or less, and the length (L) is preferably 50 mm or more and 1000 mm or less. The height H is 10 mm or more, preferably 30 mm or more and 100 mm or less.

The width W, the length L, the height H and the thickness of the metal plate P may be properly determined in consideration of the magnitude of the load to which the grating 100 is subjected.

On the other hand, when joining the neighboring gratings 100, it is also possible to provide a reinforcing bar 40 between the supports 30. 8 (a) and 8 (b), the reinforcing bar 40 is a metal plate having the same length as the length L of the main body 10 and having the same height H as the supporting portion 30, And includes a plurality of fastening holes (42). The fastening holes 42 are formed at positions corresponding to the fastening holes 32. The reinforcing bar (40) is installed between the supports (30) to increase the load bearing capacity of the grating.

9A and 9B show a modified example of the reinforcing bar. The reinforcing bar 40a further includes a non-slippery protrusion 44 formed at the upper end of the reinforcing bar 40, as compared with the reinforcing bar 40. [ When the reinforcing bars 40a are provided between the supporting portions 30, the non-slip projections 44 project further than the upper surface of the grating, thereby preventing the pedestrian or the like from slipping.

Although the arcuate slip prevention protrusions 44 are shown in the drawings, the slip prevention protrusions may have various shapes, for example, rectangular shapes or the like, to the extent that the frictional force can be increased.

The grating 100 does not require the bearing bar 3 and the cross bar 4 of the existing grating 1 because the support portion 30 supports the load. Conventionally, it took a lot of time and cost to manufacture and weld (joint) the bearing bar 3 and the cross bar 4. However, the grating according to the present invention requires such a bearing bar 3 and cross bar 4 Therefore, product cost and manufacturing time can be reduced.

On the other hand, as described above, the through holes 12 are formed by primary punching and secondary punching. 4, the grating 100 is connected to each other by bending the metal plate P and connecting the supporting portions 30 to each other. Then, the main body 12 is first punched to form a plurality of small holes (11).

Then, as shown in Fig. 5, the small holes 11 are secondarily punched to form the through holes 12. As shown in Fig. The secondary punching pushes the metal portion around the hole 11 down by pushing a punch (not shown in the drawing) having a diameter larger than the hole 11 into the hole 11. [ When the metal portion around the hole 11 is pushed down by the secondary punching as described above, the inclined portion 14 is formed in the lower portion of the through hole 12 as shown in Figs. 8 and 9 .

The inclined portion 14 is formed to have a larger diameter at the lower end than the upper end thereof. This structure is advantageous not only for the excellent discharge but also for the installation of the opening and closing member 400 (500). The opening and closing members 400 and 500 will be described below.

The structure in which the inclined portion 14 is formed under the through hole 12 increases the load supporting force of the main body portion 10.

The first and second punching are performed after connecting the gratings 100 to each other. However, the first and second punching may be performed before the metal plate P is bent. Also, the primary punching may be performed before bending the metal plate P, and the secondary punching may be performed after connecting the gratings to each other. This is because those skilled in the art will be able to refer to this specification You can easily see its composition.

Meanwhile, the grating 100 is installed so as to cover the collecting and draining passage, and FIG. 10 shows that a grating assembly is installed at the upper end of the U-shaped concrete drainage passage. As shown in the figure, an L-shaped angle 6 is provided at the upper end of the concrete drainage path, and a grating assembly is installed on the angle 6.

When the grating assembly is installed to cover the collecting and draining passage, it is preferable to connect the grating 100 only in one of the longitudinal direction and the width direction of the grating 100, The combination of the 'all' grating 100 in the longitudinal and width directions is undesirable because the stress is concentrated in the connecting portion of the grating. For example, as shown in Fig. 10, the grating 100 having a length L slightly longer than the inside width of the collecting and draining passage may be disposed along the longitudinal direction of the collecting drainage (that is, in the width direction of the grating ).

As described above, the grating 100 according to the first embodiment is manufactured by cutting the vertex portion of the rectangular metal plate P and vertically bending the rim portion. The grating according to the present invention can be made in various ways have.

11 to 17 show a grating made by a method different from that of the first embodiment. The grating 200 is made by drawing processing. 11 to 17, the same reference numerals as those in Figs. 1 to 10 denote the same elements.

Specifically, as shown in FIGS. 11 to 14, the vertex portion of the rectangular metal plate P is cut at a predetermined curvature, and then drawn to form the main body portion 10 and the support portion 30. The reason for cutting the vertex portion is to make the height of the support portion 30 at the vertex equal to the height of the support portion at the other portion.

The supporting portion 30 is formed to be perpendicular to the main body portion 10. Since the supporting portions 30 on both sides are integrally formed, a process for joining the supporting portions 30 on both sides is not required.

A plurality of fastening holes 32 for coupling with neighboring gratings are formed in the support portion 30. [

A plurality of through holes 12 are formed in the main body 10. The structure and role of the through hole 12 are the same as those of the through hole 12 of the first embodiment. The through holes 12 are formed by first and second punching, and the first and second punching are the same as the first and second punching of the first embodiment.

Specifically, the drawn metal plates P are bonded to each other as shown in FIG. 15, and through holes 12 are formed by first and second punching. 16 and 17 show through holes 12 formed by the punching operation.

Meanwhile, the through holes 12 may be formed in various shapes. FIG. 18 shows a grating 300 having elliptical through holes 12 coupled together (grating assembly). The grating according to the present invention may have through holes 12 of various shapes within a range that can smoothly discharge the storm.

The opening and closing member (400) may be installed in the through hole (12). The opening and closing member 400 prevents the odor from rising up at the same time while allowing the bleeding to be discharged to the drain.

19A to 19C, the opening and closing member 400 includes a coupling portion 410 having a hole 412 to be coupled to the inclined portion 14, A connecting part 420 connecting the connecting part 410 and the stopper part 420 so that the stopper part 420 can be rotated and providing a resilient restoring force for returning the stopper part 420 to the home position, Lt; / RTI > The opening and closing member 400 is preferably integrally made of rubber, soft plastic, urethane, silicone, or the like.

It is preferable that the inner peripheral surface of the hole 412 is formed as an inclined shape which mates with the inclined portion 14 so that the engaging portion 410 can be stably coupled to the inclined portion 14. [

20 (a)). When a load (not shown in the drawings) is applied to the upper portion of the cap portion 420, the cap portion 420 is rotated downward to open the through hole 12 (Fig. 20 (b)). Then, when the load of the abdomen is removed, the resilient restoring force of the connecting portion 430 returns to the original position to block the through hole 12 (Fig. 20 (a)).

The opening and closing member may have a different structure depending on the shape of the through hole. 22 (a), (b) and 22 (c) show the opening / closing member 500 installed in the elliptical through hole 12, ). ≪ / RTI >

The opening and closing member 500 includes a fastening part 410 and a stopper part 420 and a connecting part 430. The fastening part 410 and the stopper part 420 of the opening and closing member 400, And the connection unit 430, respectively. The material of the opening and closing member 500 is the same as that of the opening and closing member 400 described above.

23 (a) is a plan view showing another opening and closing member that can be used in the present invention, and Fig. 23 (b) is a front view showing the opening and closing member.

The opening and closing member 600 includes an engaging portion 610, a fastening means 620 provided on the engaging portion 610, a supporting portion 630 formed to extend outward from the engaging portion 610, And a cap 640 formed on the cap 640.

The engaging portion 610 is positioned to correspond to the first engaging hole (15 in Fig. 24). The coupling portion 610 is formed with a second coupling hole 615 passing through the coupling portion 610 in the up and down direction. The opening and closing member 600 may be coupled to the grating 100 when the fastening means 620 such as a bolt, a rivet or the like is installed to penetrate the first engaging hole 15 and the second engaging hole 615.

In the case where the head portion of the fastening means 620, for example, the fastening means 620 is formed of a bolt and a nut, the bolt head may be installed so as to protrude further above the upper surface of the grating 100, Ensure that the bolt head is anti-slip.

As shown in Fig. 24, the first coupling holes 15 are provided at predetermined intervals between the through holes 12.

23 (c), 25 and 26, the support portion 630 is formed to extend horizontally from the lower end of the coupling portion 610 to the outside.

The support portion 630 provides a supporting force so that the stopper portion 640 can seal the through hole 12. [ The support portion 630 provides an elastic restoring force so that when the load is removed, the stopper portion 640 is returned to the original position after the stopper portion 640 is rotated down due to the load of the abrasion. Accordingly, the opening and closing member 600 normally hermetically closes the through hole 12 to prevent the odor or the like from rising upward. If there is a load such as an abrasion on the upper portion, the stopper 640 is rotated downward, 12 are opened to move the rain or the like downward and return to the original position when the load is removed.

The support portion 630 has sufficient height and elasticity to provide such elastic restoring force. Since the lower end (for example, a nut) of the fastening means 620 supports the connecting point between the supporting portion 630 and the engaging portion 610, sufficient elastic restoring force can be provided.

Preferably, a plurality of support portions 630 are formed radially in the engaging portion 610. Although four support portions 630 extend outward from the coupling portion 610, the number of the support portions 630 may be increased or decreased corresponding to the number of the through holes 12 to be opened and closed.

The stopper portion 640 serves to seal the through-hole 12. The stopper portion 640 has a shape corresponding to the through hole 12.

Meanwhile, the sealing member 600 has a guide portion 650 for preventing the support portion 630 from twisting sideways when it rotates. The guide portion 650 is formed to extend horizontally from the middle portion of the engaging portion 610 to the outside along the support portion 630. The guide portion 650 is not coupled to the cap portion 640. Therefore, the guide portion 650 prevents the support portion 630 from twisting sideways by guiding and supporting the support portion 630 laterally when the support portion 630 rotates.

1, 100, 200, 300: grating 10:
12: through hole 14: inclined portion
30: Support part 32:
40, 40a: reinforcing bars 400, 500, 600: opening / closing member
P: metal plate

Claims (14)

And a support portion (30) made by vertically bending a rim portion of a flat metal plate (P)
A plurality of through holes 12 are formed in the metal plate on the inner side of the rim and a fastening hole 32 is formed in the supporting portion 30 for engaging with a neighboring grating,
The support portion 30 supports the load acting on the grating,
A bearing bar (3) for supporting a load, and a cross bar (4) for maintaining a gap between the bearing bars (3). The method according to claim 1,
A grating characterized by the absence of welding. A grating assembly according to claim 1 or 2, wherein the gratings are coupled to each other in a horizontal direction. The method of claim 3,
Reinforcing bars 40 and 40a for supporting the load are provided between the supporting portions 30 at the connecting portion with the neighboring gratings,
Wherein the fastening member (36) is installed through the two support portions (30) and the reinforcing bars (40) (40a) to connect neighboring gratings to each other. The method of claim 3,
The through hole (12) is formed with an inclined portion (14) formed to face downward. The inclined portion (14) has a larger diameter at the lower end than the upper end,
The inclined portion 14 is provided with an opening and closing member 400 (500) for opening and closing the through hole 12,
The opening and closing members (400, 500)
A fastening portion 410 having a hole 412 fastened to the inclined portion 14;
A stopper 420 capable of rotating with respect to the fastening part 410; And
The connecting portion 410 and the stopper portion 420 are connected to each other so that the stopper portion 420 can be rotated and the stopper portion 420 is integrally formed with the stopper portion 410 and the stopper portion 420, And a connecting portion 430 for providing an elastic restoring force for the elastic member,
The inner circumferential surface of the hole 412 is formed as a ramp which mates with the inclined portion 14,
Wherein the stopper (420) is pivoted downward by a load of upper superiority to open the through hole (12), and is returned to its original position by an elastic restoring force when the abdomen is removed. The method of claim 3,
And an opening and closing member (600) for opening and closing the through hole (12)
The opening and closing member (600)
An engaging portion 610;
A coupling means 620 fastened to the coupling portion 610 to couple the opening and closing member 600 to the grating;
A support portion 630 formed to extend outwardly from the engaging portion 610; And
And a stopper portion 640 formed on the upper portion of the support portion 630,
The support portion 630 provides an elastic restoring force so that the stopper portion 640 provides a supporting force for sealing the through hole 12 and can return to the home position when the stopper portion 640 is rotated and opened,
The grating includes a first coupling hole 15 and a coupling portion 610 formed with a second coupling hole 615. The coupling means 620 penetrates the first and second coupling holes 15 and 615, Lt; / RTI >
Characterized in that the head portion of the fastening means (620) further protrudes above the upper surface of the grating to provide a non-slip function. The method according to claim 6,
A plurality of support portions 630 are formed,
And guide portions 650 extending outwardly from the engaging portions 610 on both sides of the supporting portions 630 along the respective supporting portions 630. The guide portions 650 are formed on the sides of the supporting portions 630 when the supporting portions 630 are rotated And supports and supports the support portion (630) so as not to be distorted. A method of making a grating assembly in which a plurality of gratings are combined in a horizontal direction,
(a) bending the rim of the flat metal plate P vertically to make the support 30;
(b) forming a plurality of small holes (11) by first punching the metal sheet material inside the rim; And
(c) punching the small hole (11) to form a through hole (12) having a larger diameter than the small hole (11). 9. The method of claim 8,
In the step (a)
Wherein the metal plate has a rectangular shape and neighboring supports 30 are connected to each other by a connecting member 34 and a fastening member 36 having a cross sectional shape. 9. The method of claim 8,
Wherein the step (a) comprises drawing a rectangular metal plate to form the support part (30). 9. The method of claim 8,
The secondary punching is performed by pushing a punch having a larger diameter than the small hole 11 into the hole 11, thereby forming an inclined portion 14 extending downwardly through the through hole 12,
Wherein the slope part (14) is provided with an opening / closing member (400) (500) for opening / closing the through hole (12). 12. The method of claim 11,
The inclined portion 12 is formed to have a larger diameter than the upper end,
The opening and closing members (400, 500)
A fastening portion 410 having a hole 412 fastened to the inclined portion 12;
A stopper 420 capable of rotating with respect to the fastening part 410; And
The connecting portion 410 and the stopper portion 420 are connected to each other so that the stopper portion 420 can be rotated and the stopper portion 420 is integrally formed with the stopper portion 410 and the stopper portion 420, And a connecting portion 430 for providing an elastic restoring force for the elastic member,
Wherein the stopper portion (420) is pivoted downward by a load of upper superiority to open the through hole (12), and when the abdomen is removed, the stopper portion (420) is returned to its original position by an elastic restoring force. 13. The method according to any one of claims 8 to 12,
Reinforcing bars 40 and 40a are provided between the supporting portions 30 of adjacent gratings,
Wherein the fastening member (36) is installed through the support (30) and the reinforcing bars (40) (40a). 13. The method according to any one of claims 8 to 12,
Wherein no welding is used in the production of the grating.

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