KR20160135611A - Installation device of light-weight and high-load for access floor panel for a beam - Google Patents

Abstract

Disclosed is a device for installing a light-weight high-load access floor panel for a beam element. A floor panel (100) comprises: a rectangular upper plate (110) of a prescribed standard; a middle cross-shaped rib (120) having a prescribed height on a lower surface of the upper plate (110), and crossing on a middle portion thereof; a plurality of parallel ribs (130) symmetrically installed on both sides of the middle cross-shaped rib (120) in parallel with a beam element (200); and a plurality of perpendicular ribs (140) symmetrically installed on both sides of the middle cross-shaped rib (120) in a direction perpendicular to the beam element (200). The upper plate (110), the middle cross-shaped rib (120), the parallel ribs (130), and the perpendicular ribs (140) are integrated with each other. The parallel ribs (130) and the perpendicular ribs (140) corresponding to each other have different shapes and thicknesses.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-weight heavy-duty access floor panel mounting apparatus,

The present invention relates to an aluminum access floor panel which is a double floor flooring installed on the upper surface of a beam element and more specifically to a floor panel which is installed directly on the upper surface of a beam element such as an H-beam or a square tube, Weight access floor panel mounting apparatus for a small-size heavy-load type access floor panel mounting apparatus.

In high-precision parts and manufacturing processes, almost all work is done in a clean room. The clean room is a double floor system that functions as a control device for humidity control and static electricity, as well as for covering various kinds of process equipments or for precise horizontal floor for moving the conveying means, concealing electrical wiring including plenum, do.

This double floor system with access floor structure is used not only in the clean room but also in the computer room, the machine room, the semiconductor equipment room, and the general office, without the separate piping or the cable tray, To allow the centralized air conditioning system to be installed at a certain height from the foundation floor.

The clean room 10 includes a fan filter unit 30 for supplying purified air to the inside of a clean room around the access floor 20, And a lower space 51 in which a plenum 41 for discharging the air supplied from the upper space 50 below the clean room floor is disposed. The lower space 51 of the access floor 20 is provided with a power cable 60 required for operating equipment and equipment 31 installed in the clean room 10 and a piping 61 for supplying various raw materials, And is adapted to accommodate indirect work equipment and equipment 62 that supports the operation of the equipment in the room 10 and which accommodates such various equipment and power cable 60 and piping 61 and equipment and equipment 62 It is general to secure a space by installing a beam 80 such as a grid beam on the minimum column 70 and installing the access floor 20 on the beam 80 for the purpose.

2 and 3 illustrate a state in which an access floor is installed on a conventional general beam element. FIG. 2 shows a structure in which a beam element structure such as an H-beam 81 is provided on a concrete grid beam 80, 3 is an example in which the access floor panel 21 is installed to be supported by the support pads 90 at the corners of the respective access floor panels 21 as an example of the state in which the access floor panel 21 is installed. 70, and a beam element such as a square tube 82 is installed on a grid-like structure, and then an access floor panel 21 is installed thereon to form an access floor 20.

As described above, the beam elements such as the H-beam 81 and the square tube 82 are installed on the upper part of the concrete grid beam 80 or the post 70 and the spacing between the grid beam and the posts and the installation The method is not limited to the above-described example, and may be installed in various forms depending on the situation of the installation site.

Conventionally, a method of using four supports at four corners of a rectangular floor panel has been used, so that only four corners of the floor panel are supported even when the floor panel is installed at the top of the beam element. In the case of a floor panel installed at the upper part of the beam element, two sides of the floor panel parallel to the beam element are installed at the upper part of the beam element with a small interval, and when a high load is applied at the upper part of the floor panel, A method is proposed in which the rigidity of the floor panel is increased at the central portion of the floor panel by increasing the strength of the directly supported portion as well as increasing the support points of the floor panel.

However, it has been pointed out that the above-described method alone has a relatively low saving effect on the weight obtained by the change of the design stiffness corresponding to the increase in strength of the two sides parallel to the beam element.

Also, it is necessary to install the floor panel on the upper surface of the parallel beam in a precise manner when installing the floor panel. It is easy to check the installation direction when the floor panel is installed or reinstalled after installation. It is pointed out that there is a danger that the strength is very weak and the possibility of collapse is very high.

In general, when a damper or an absorbing pad for adjusting the airflow, which is attached directly to a lower portion of a floor panel for a double floor, is attached with a clip or a screw, interference due to a thickness (1 to 5 mm) There is a problem that it can not be installed.

[Patent Document 1] Korean Patent No. 10-1480874 (Published on Jan. 2015)

SUMMARY OF THE INVENTION The present invention provides a low-load, heavy-load type access floor panel installation apparatus for a companion, which is capable of realizing high rigidity while minimizing the weight of the bottom panel structure It has its purpose.

In addition, the present invention is also applicable to a low-floor heavy-load type accessory for a small-sized compartment capable of installing a double floor having a more stable supporting force by allowing an additional supporting point to be generated at the center of both sides of a parallelepiped of a rectangular floor panel, There is provided a floor panel installation apparatus.

It is another object of the present invention to provide a low-load, heavy-load type access floor panel installation apparatus for a companion, which facilitates installation of a filter for absorbing airflow control damper or chemical mist or the like on a lower surface of a floor panel.

In addition, the present invention provides a low-load, heavy-load type access floor for a small-sized booth for guiding the installation of a floor panel between adjoining beam elements so as to accurately install the floor panel in a direction in which its own rigidity works correctly, And an object thereof is to provide a panel mounting apparatus.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a plurality of beam elements arranged to be spaced apart from each other at a predetermined height to form a space therebetween, A floor panel fixedly installed on an upper surface of the beam element and connecting adjacent beam elements; And a support pad sandwiched between the beam element and the floor panel, wherein the floor panel comprises: a top plate in a rectangular shape of a predetermined size; A central rib shaped to have a predetermined height at the bottom of the upper plate and intersecting at a central portion; A plurality of parallel ribs symmetrically provided on both sides of the central ribs and installed to be parallel to the ribs; And a plurality of right angle ribs provided symmetrically on both sides of the central rib-shaped ribs and installed to be perpendicular to the beam elements; The parallel ribs and the rectangular ribs corresponding to each other are formed in different shapes and thicknesses, respectively.

According to the embodiment of the present invention, the ribs in the parallel direction are formed to be lower than the height of the corresponding rectangular direction ribs, respectively.

According to an embodiment of the present invention, the parallel ribs are parallel outer ribs located on both outer sides of the floor panel; A parallel inner rib positioned on the inner side of the parallel outer ribs, and a plurality of parallel reinforcing ribs.

According to an embodiment of the present invention, said right angle ribs are right angle outer ribs located on both outer sides of said floor panel; A right angle inner rib located inside the right angle outer rib, and a plurality of right angle reinforcing ribs.

According to an embodiment of the present invention, the parallel outer ribs are formed at a height of 1/3 or less of the height of the parallel inner ribs.

According to an embodiment of the present invention, the parallel outer rib is provided with a round connection part for stress dispersion at a connection part between the two side floor panel seals.

According to an embodiment of the present invention, the round connecting portion is formed such that the minimum radius of the round is larger than 10 mm.

According to an embodiment of the present invention, the rectangular reinforcing rib is formed such that the height of the center portion is higher than the height of both sides, and the inclined portion is inclined.

According to an embodiment of the present invention, the support pad is provided with a plurality of direction-setting projections projected to recognize the state of engagement with the bottom panel seam provided at the corner of the bottom panel.

According to an embodiment of the present invention, the supporting pads are formed in a rectangular shape having a different length from each other, and the bottom panel facing portion corresponding to the supporting pads is also formed in a rectangular shape.

According to an embodiment of the present invention, the bottom panel seam is provided with an erroneous insertion preventing protrusion protruding from the center.

According to the embodiment of the present invention, a damper is installed on the bottom surface of the floor panel.

In the present invention, an aluminum floor panel constituting a double floor system is installed on a beam element installed in a parallel direction, and unnecessary weight reduction is performed to minimize the weight required for an aluminum material having a suitable rigidity and high material cost There is an effect that the manufacturing cost is reduced.

Further, the present invention has the effect of making it possible to manufacture the floor panel with the optimum weight at the level of rigidity required to use the rigidity of the beam element as safely as possible.

In addition, the present invention has the effect of providing a more stable double floor installation by preventing the rigidity of the floor panel from being changed by changing the installation direction of the floor panel when the floor panel of the dual floor system is installed.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a typical large clean room constructed with a double floor.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an H-beam type beam element.
3 is an explanatory diagram of a state in which an access floor is installed on a square tubular beam element installed on a conventional post.
4 is a perspective view showing structural characteristics of a lower surface of a floor panel according to an embodiment of the present invention;
FIG. 5A is a plan view of FIG. 4; FIG.
5b are shown on the right side of Fig.
5c is a bottom view of Fig.
FIG. 6 is a view showing a floor panel installed on an upper part of a beam element according to an embodiment of the present invention, in which a) is a view in a direction parallel to the beam element,
b) is a view from the direction perpendicular to the beam element.
FIG. 7 is a sectional view taken along the line A-A of FIG. 4 illustrating a state where a deformation is generated when a load is applied to a central portion of a floor panel installed with minute gaps according to an embodiment of the present invention,
a) is a state before a load is applied,
b) is a state where a load is applied and deformation occurs.
8 is a cross-sectional view showing the shape of a rib according to an embodiment of the present invention,
4A is a sectional view taken along the line B - B in Fig. 4,
b) is a sectional view taken along the line C - C of Fig.
FIG. 9 is a view showing a state when a load is applied according to the shape of a central serpentine rib perpendicular to a beam element according to an embodiment of the present invention,
a) shows an example in which the beam element is deformed when there is no land portion having the same height as the parallel inner rib and having a uniform rib height,
b) is a sectional view taken along the line D - D of Fig. 4, in which the height of the ribs is reduced and the land portion is formed by reflecting the increase in strength due to the shortening of the support point distance due to the support of the parallel inner ribs.
FIG. 10 is a sectional view taken along the line E - E of FIG. 4, showing the shape of a rectangular reinforcing rib.
11 is a perspective view of a support pad according to an embodiment of the present invention.
12 is a view illustrating a state in which the support pad and the bottom panel seam are coupled according to the embodiment of the present invention,
a) is installed in the normal right direction,
b) shows the state where the erroneous insertion preventing jaw and the direction setting protrusion are mutually interfered with each other by mistake.
13 is a bottom perspective view of a floor panel according to an embodiment of the present invention in which a damper is assembled.

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

4 is a perspective view showing the structural characteristics of the lower surface of the floor panel according to the embodiment of the present invention, Fig. 5 is a view showing the shape of the floor panel viewed from various angles, 4 is a bottom view of FIG. 4, and FIG. 6 is a view showing a floor panel installed on a top of a beam element according to an embodiment of the present invention, in which a) And Fig. 6B is a view in a state of being viewed in a direction perpendicular to the beam element.

The floor panel 100 according to the embodiment of the present invention is installed on the upper surface of a plurality of the beam elements 200 installed at a predetermined interval so that there is a difference in rigidity supported according to the installation direction, The required rigidity can be obtained only by the installation.

The beam element 200 on which the floor panel 100 is installed is a structure such as an H-beam or a square tube and has a flat upper surface. They are installed parallel to each other while maintaining a constant width.

Therefore, the floor panel 100 is installed on the upper surface of the beam element 200 installed side by side and connected to the adjacent beam element 200 ', thereby forming a floor.

The bottom panel 100 includes a top plate 110 having a rectangular shape and a plurality of ribs integrally formed on the bottom surface of the top plate.

The central plate-shaped rib 120 having the largest height is provided at the center of the bottom surface of the upper plate 110 to have the overall rigidity of the upper plate 110.

The central ribs 120 are formed on the bottom surface of the upper plate 110 to have a constant height and intersect at a central portion.

A plurality of parallel ribs 130 and a plurality of right-angled ribs 140 are symmetrically provided on both sides of the central rib-shaped ribs 120 in the upward / downward direction and the left / right direction.

The parallel direction ribs 130 are ribs that are parallel to the beam element 200 at the time of installation and the ribs that are perpendicular to the beam element 200 at the time of installation are classified It is named.

Accordingly, the parallel direction ribs 130 are provided so as to be installed in a direction parallel to the beam elements 200, and have various heights depending on their positions, so as to have appropriate rigidity and to minimize the use of materials It is possible to lower the height possible to lose weight.

A plurality of rectangular ribs 140 perpendicular to the parallel direction ribs 130 are provided symmetrically on both sides of the central ribs 120 and are installed in a direction perpendicular to the rectangular element ribs. .

Since the plurality of right angle directional ribs 140 are connected to each other between the beam elements 200 on both sides thereof, it is a very important part that affects the rigidity of the floor panel 100. Therefore, do.

Therefore, in the embodiment of the present invention, the parallel ribs 130 and the rectangular ribs 140 are integrally formed as the bottom panel 100 but are formed in different shapes and thicknesses, respectively .

That is, as shown in FIG. 4, the parallel direction ribs 130 are formed to be lower than the height of the corresponding rectangular directional ribs 140, respectively.

The parallel direction ribs 130 include parallel outer ribs 131 located on both outer sides of the floor panel 100 and parallel inner ribs 132 located on the inner side of the parallel outer ribs 131, Rib 133 as shown in Fig.

The right-angle directional ribs 140 include right angle outer ribs 141 located on both outer sides of the floor panel 100, right inner ribs 142 located inside the right angle outer ribs 141, And a rib 143.

6A) is an installation shape of sides perpendicular to the beam element 200, and FIG. 6B is an installation shape of sides parallel to the beam element 200. The beam element 200 shows the use of H- FIG. 4 is a perspective view of the floor panel 100 according to the embodiment of the present invention.

It is preferable that the support pad 300 installed between the floor panel 100 and the beam element 200 has a thickness of 3 to 4 mm. In the embodiment of the present invention, And has a very important function for defining the installation direction of the vehicle.

The parallel ribs 130 and the rectangular ribs 140 of the floor panel 100 which contact the upper surface of the beam element 200 form mutual installation interference skin.

6a), the installation interference between the parallel inner ribs 132 and the right outer ribs 141 of the floor panel 100 may cause the skin to be deformed when the support pad 300 or the floor panel 100 is deformed. It is preferable to form the rib 200 at least 1 mm lower than the dimension of the right-angled outer rib 141 and the parallel inner rib 132 so as not to press the end face of the element 200, preferably 3 to 4.5 mm lower.

6B, when the load does not act on the upper surface of the bottom panel 100, the spacing between the parallel inner rib 132 and the beam element 200 is about 0.5 to 1.0 mm And when the load acts on the floor panel 100, the floor panel 100 is slightly sagged so as to be brought into contact with the upper surface of the beam element 200 to be supported.

FIG. 7 is a cross-sectional view taken along the line A-A of FIG. 4, illustrating deformation when a load is applied at a central portion of a floor panel 110 provided with a minute gap according to an embodiment of the present invention, (B) shows a state in which a load is applied, and explains the operation state of the beam element 200 and a specific part of the floor panel 100 installed on the upper part of the beam element 200 Fig.

That is, FIG. 7A shows a state in which a minute gap is formed between the upper surface of the beam element 200 and the right inner rib 142 formed on the bottom surface of the floor panel 100 in a normal load state, 7B is a state in which a load is applied to an upper portion of the floor panel 100 to cause a deformation of the floor panel 100. When a load F is applied to the floor panel 100, 200 and then the end of the parallel inner rib 132 serves as a fulcrum to serve as a rotating shaft so that the parallel outer rib 131 is lifted up as indicated by the arrow G. [

When the deformation of the floor panel 100 continues, the rectangular inner rib 142 of the floor panel touches and presses the end portion S of the beam element 200, and the end portion S is easily deformed even with a small bending load. .

The present invention is configured to have the shape and weight most appropriate to the required load in consideration of the contact state of the floor panel installed on the upper part of the beam and the occurrence of deformation with respect to the load, The parallel outer ribs 131 and the parallel inner ribs 132 which are the outer two ribs of the parallel ribs 130 are in contact with the upper surface of the beam element 200 when the load is applied, So as to become the parallel inner rib 132.

That is, since the distance between the support points is shortened, the parallel inner ribs 132 are supported by the parallel inner ribs 132, The rib 131 satisfies the designed load even at 1/3 or less of the height of the adjacent parallel inner ribs 132.

4, the height of the parallel outer rib 131 may be minimized, and the parallel outer rib 131 may be made to have a height of about 1/3 of the parallel inner rib 132, The weight saving effect can be obtained.

At this time, in order to prevent local destruction due to an impact load or a torsional stress momentarily applied in a short time, the parallel outer ribs 131 are formed to be large at the connection portion between the bottom panel case 150 and the parallel inner ribs 132, By forming the round connecting part 134 having rounds, the load can be smoothly dispersed. It is preferable that the minimum radius of the round connecting part 134 is 10 mm or more.

FIG. 8 is a cross-sectional view showing the shape of a rib according to an embodiment of the present invention, wherein FIG. 8A is a cross-sectional view taken along the line B-B in FIG.

That is, when the load is concentrated at the center of the central rib-shaped rib 120 parallel to the beam element 200, the center rib-shaped ribs 120 are arranged in the same direction in both the parallel direction and the right- And the right-angled outer ribs 141 are configured to have the same height as the parallel inner ribs 132 for the purpose of easy loading of the floor panel 100.

The height of the adjacent right-angled inner ribs 142 reinforcing the strength of the right-angled outer ribs 141 may be greater than the height of the parallel inner ribs 132 < RTI ID = 0.0 > And a portion connecting between the right inner corner rib 142 and the right outer corner rib 141 is formed by partially treating the portion of the right outer corner rib 141 in order to improve the breaking strength of the right outer corner rib 141, (121).

FIG. 9 shows a state when a load is applied according to the shape of a central rib shaped at right angles to a beam element according to an embodiment of the present invention, in which a) is a rib having the same height as a parallel inner rib and having a uniform rib height B) is a cross-sectional view taken along the line D-D in Fig. 4, in which the height of the ribs is reduced to reflect the increase in strength due to shortening of the support point distance due to the support of the parallel inner rib 132, A land portion 121 of a short section having the same height as that of the parallel inner rib 132 is provided to narrow the distance between the support points.

The length of the land portion 121 is preferably 1/5 to 2/6 of the width of the upper surface of the beam so that the rib is directly in contact with the weak portion S of the beam element 200 to not deform the beam.

FIG. 10 is a sectional view taken along a line E - E of FIG. 4, showing the shape of a right angle reinforcing rib, in which the entire section of the rib is formed to have the same height as a cross section of a right angle reinforcing rib 143 disposed in a direction perpendicular to the beam element 200 And a portion where the reaction force is high and a portion where the reaction force is low and the reaction force is low are formed to be high. The section between the two is inclined portion 144 formed to be inclined.

The maximum height and minimum height of the right angle reinforcing ribs 143 are arbitrarily set according to the degree of load required for the floor panel 100. The length of the section having the maximum height is 1/4 to 1 / The three levels are suitable and the low-height section of the right-angled reinforcing rib 143 is suitable for the level of 5/4 to 3/2 of the spacing of the lattice ribs.

FIG. 11 is a perspective view of a support pad according to an embodiment of the present invention, in which a support pad 300 is fitted between the beam element 200 and the floor panel 100.

The supporting pad 300 is provided with a plurality of direction setting protrusions 310 protruding to recognize a state of engagement with the floor panel ceiling 150 provided at the corner of the floor panel 100.

The support pad 300 is formed in a rectangular shape having a different side length, and the bottom panel seating 150 corresponding to the support pad 300 is also formed in a rectangular shape.

 12 is a view illustrating a state in which the support pad and the bottom panel seam are coupled according to the embodiment of the present invention, in which a) is installed in a normal right direction, b) And shows mutually interfered states.

The bottom panel ceiling 150 is rectangular and has one side longer than the other, and has an erroneous insertion preventing protrusion 151 protruding from the center thereof. The lower panel ceiling 150 has a plurality of protrusions formed on the upper surface of the supporting pad 300 It is determined whether or not the installation direction of the floor panel 100 is correct according to the contact with the setting protrusion 310.

Therefore, according to the present invention, it is possible to easily detect whether the bottom panel ceiling 150 and the supporting pad 300 are installed in the correct direction according to the combined state of the floor panel ceiling 150 and the supporting pad 300, So that it can be installed with strong rigidity.

FIG. 13 is a bottom perspective view of a floor panel according to an embodiment of the present invention, in which a damper is assembled. A damper 400 can be easily installed on a bottom surface of the floor panel 100.

That is, on the lower surface of the floor panel 100, it is possible to facilitate the installation of a filter for absorbing the airflow control damper or the chemical mist.

As described above, according to the embodiment of the present invention, in the structure of the central rib-shaped ribs of the floor panel installed on the upper part of the beam element and the ribs in the parallel direction parallel to the beam elements and the rectangular ribs It is possible to provide the floor panel having the optimum weight and strength for the required strength by providing the optimal constitutional requirement according to the relationship with each supporting point, thereby improving the durability of the floor panel and improving the durability of the aluminum material So that the manufacturing cost can be lowered.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

100: floor panel
110: top plate
120: central rib-shaped rib 121: land portion
130: Parallel rib 131: Parallel outer rib
132: parallel inner rib 133: parallel reinforcing rib
134: Round connection
140: right angle direction rib 141: right angle outer rib
142: right angle inner rib 143: right angle reinforcing rib
144:
150: Floor panel poetry 151: O insertion bust
200: beam element
300: support pad 310: direction setting projection
400: damper

Claims (12)

A plurality of beam elements (200) arranged to be spaced apart from each other at a predetermined height so as to form a space therebetween and arranged in parallel with a predetermined width;
A floor panel 100 fixedly installed on the upper surface of the beam element 200 and connecting the adjacent beam elements 200 ';
And a support pad (300) sandwiched between the beam element (200) and the floor panel (100), the apparatus comprising:
The floor panel (100)
A top plate 110 having a rectangular shape of a predetermined size;
A central serpentine rib 120 formed at the bottom of the upper plate 110 and having a predetermined height and intersecting at a central portion;
A plurality of parallel direction ribs (130) symmetrically provided on both sides of the central serpentine ribs (120) and installed to be parallel to the beam elements (200); And
A plurality of right angle ribs 140 symmetrically provided on both sides of the central ribs 120 and installed to be perpendicular to the ribs 200;
Wherein the parallel direction ribs 130 and the right directional ribs 140 are formed to have different shapes and thicknesses, respectively.
The method according to claim 1,
The ribs 130 in the parallel direction,
And the height of the corresponding right-angle direction ribs (140) is lower than the height of the corresponding right-angle direction ribs (140).
3. The method according to claim 1 or 2,
The parallel ribs 130
Parallel outer ribs 131 located on both outer sides of the floor panel 100;
A parallel inner rib 132 located inside the parallel outer rib 131;
And a plurality of parallel reinforcing ribs (133).
3. The method according to claim 1 or 2,
The right-angle directional ribs 140
Right outer ribs 141 located on both outer sides of the floor panel 100;
A right angled inner rib 142 positioned inside the right angle outer rib 141;
And a plurality of right angle reinforcing ribs (143).
The method of claim 3,
The parallel outer ribs 131,
And the height of the parallel inner ribs (132) is 1/3 or less of the height of the parallel inner ribs (132).
6. The method of claim 5,
The parallel outer ribs 131
And a round connection part (134) for stress dispersion is provided at a connection part between the floor panel (150) and the floor panel (150).
The method according to claim 6,
The round connection part 134
And the minimum radius of the round is larger than 10 mm.
5. The method of claim 4,
The right angle reinforcing rib 143 is formed of a right-
Wherein the height of the central portion is higher than the height of both sides, and the inclined portion (144) is provided at an oblique angle.
The method according to claim 1,
The support pads 300
And a plurality of direction setting protrusions (310) protruded to recognize a state of engagement with the floor panel ceiling (150) provided at an edge of the floor panel (100). Device.
10. The method of claim 9,
Wherein the supporting pad 300 is formed in a rectangular shape having a different length and the bottom panel seating 150 corresponding to the supporting pad 300 is also formed in a rectangular shape. .
10. The method of claim 9,
The bottom panel ceiling (150)
And an erroneous insertion preventing jaw (151) protruding from the center of the bottom wall (130).
The method according to claim 1,
And a damper (400) is installed on a bottom surface of the floor panel (100).

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