KR102051940B1 - Prefab Grating - Google Patents

Abstract

The present invention relates to a lightweight prefabricated grating, manufactured to be used in a sewer hole or a drainage hole which are installed a restaurant kitchen, the sauna, or a swimming pool in which a lot of water is used, and used in an air blowing hole installed to supply warm air through a floor to heat the inside. The prefabricated grating comprises: a plurality of main bars (10); a plurality of cross bars (20) binding and fixing the main bars so that the main bars are arranged at predetermined intervals; fixing bars (30) each attached to both ends of the cross bars that bind and fix the main bars; and a frame (40) in which the main bars are installed.

Description

Prefab Grating {Prefab Grating}

The present invention relates to a prefabricated grating, and more particularly, it is provided to supply hot air through the floor for heating of the indoor, as well as sewers or drains provided on the floor of the kitchen or bath or swimming pool of the water-intensive dining room. The present invention relates to a prefabricated grating that is manufactured to be lightweight for use in a tuyere.

Conventionally, braces on which non-slip irregularities are formed on the upper surface and reinforcement bars having integral protrusions formed on both sides of the tubular body are manufactured by an extrusion method, and the vertical bars of the braces are formed by using a press or punching machine. Holes through which the tubular body can penetrate, and slots through which the protruding blades of the reinforcement can pass, are used together with the press or punching machine to be in the same position as the vertical bar positions of the props arranged at regular intervals. Then, the cutting grooves are formed on the protruding blades of the reinforcement so that the width thereof is equal to the thickness of the vertical bars of the braces, and then the braces are sandwiched between fixtures assembled at regular intervals on the work table. Insert the tubular body of the reinforcement into the formed hole, but the protruding wing with the partition of the reinforcement Rotate the reinforcement 90 ° so that the cutting grooves of the reinforcement are aligned with the position of the reinforcement of the reinforcement while passing through the slots of the reinforcement horizontally. The braces and the reinforcement are integrated into a lattice structure, and the braces and the reinforcement that are integral with each other are seated in the reinforcement frame, and then spot the end and the reinforcement frame at the four corners of the reinforcement frame in only four places. There was a manufacturing method of the prefabricated grating (registered patent No. 10-1376001) to prevent the brace from being separated from the reinforcing frame by welding.

However, this prefabricated grating is to assemble the brace and the reinforcement so that the vertical teeth are inserted into the cutting grooves formed by cutting the same position as the vertical position of the brace in the protruding wings on the left and right of the reinforcement. Because of the shallow depth of the cutting groove, which is vertically inserted and bitten by the structure, if it is manufactured lightly, the compound load caused by pressure, vibration, or impact that occurs every time a person passes through it is concentrated on the bottom of each cutting groove by the vertical blade. Since the corresponding portion of the reinforcement of the reinforcement is easily bent, or deformed, or the vertical ribs are separated from the cutting groove, there are problems such as shortening of the life due to cracks in severe cases.

In addition, since the vertical teeth and the cutting grooves are simply assembled in surface contact, each time vibration or impact is applied, metallic noises such as friction are generated between the contact surfaces, and the contact surfaces are easily worn and loosely assembled. There is also a problem that shortens the life.

In addition, the spot welding machine is secured to prevent the props from escaping from the reinforcing frame by spot welding the ends of the props and the 4 reinforcing frames at the four corners of the reinforcing frame with the props and the reinforcing bars settled into the reinforcing frames. Since the welding work must be prepared separately, there are problems such as economical efficiency and workability.

In addition, when spot welding the end of the brace and four reinforcement frames to fix the braces from being separated from the reinforcement frame, the braces do not easily detach from the reinforcement frame even if vibration or impact is applied. In order to replace the cracks in any one of the props and reinforcement when it is necessary to replace or crack any of the bracing and reinforcing rods, it is necessary to disassemble and replace all 4 welded spots. Therefore, the separation and replacement of the brace and the reinforcement is very complicated and there are problems such as time and cost.

The present invention has been invented in view of the above-mentioned conventional points, and an object thereof is that assembly and separation are very simple and easy, and at the same time light weight can be prevented while the lifespan is prevented. To provide prefabricated gratings.

The present invention, in order to achieve this object, the fixing portion, the binding portion extending downward from the lower end of the fixing portion, the reinforcing portion is formed to be thicker than the thickness of the binding portion at the lower end of the binding portion, and the predetermined distance to the binding portion A main bar having a coupling hole drilled in and a through hole formed horizontally cut at one side of the coupling hole; If the diameter is formed in the shape of a roll proportional to the inner diameter of the coupling hole, when the plurality of main bars are arranged in parallel, the coupling holes are respectively penetrated through the coupling lines, and the penetrating holes are formed through the outer surface. A binding piece protruding in the longitudinal direction, a cut groove formed at a predetermined interval in the binding piece and rotated in a counterclockwise direction, and a binding groove portion fitted into each of the coupling holes, and screwing holes formed at both ends thereof. Crossbars; A top plate, a fixed plate extending in two stages vertically and horizontally from the outer end of the top plate to a height lower than the top plate, a vertical plate extending downward from the middle portion of the bottom surface of the top plate, and horizontally outward from the bottom of the vertical plate At an interval corresponding to an extended lower plate, a reinforcing protrusion formed in the middle of the outer surface of the vertical plate, a binding groove portion extending at an outer end of the fixing plate, and screw fastening portions at both ends of each of the crossbars coupled to the coupling holes. A fixing bar which is drilled in the lower part of the vertical plate and has screw holes fixed to the front and rear to cross the both ends of the crossbars by fastening the fixing screws to the respective screw fasteners; An upper piece, a side piece extending vertically downward from the outer end of the upper piece, and a lower part extending horizontally inward to face the upper piece at the lower end of the side piece and a fixed portion extending inward lower than the lower part at the inner end of the lower piece. Both ends of the front and rear members including the one-piece, the vertical side piece, and the left and right members each having the horizontal side piece having the vertical side piece extending horizontally from the lower side to the inner side are attached to each other to form a rectangular shape. It provides a prefabricated grating configured to include a frame for mounting therein an assembly that is fixed to both ends of the crossbars coupled to each coupling hole through the fixing bars, respectively.

In addition, the present invention is the upper plate portion, the vertical plate portion extending downward from the middle of the lower surface of the upper plate portion, the lower plate portion horizontally extended forward and backward wider than the upper plate portion at the lower end of the vertical plate portion, and the lower plate portion at the front and rear ends of the lower plate portion, respectively It has a lower height and the front and rear width is narrowly extended to the fixed plate portion, the fixing plates of the fixed bars fixed to the front and rear ends of the assembly are respectively located under the upper plate portions and the lower plate is respectively located above the lower plate portions to combine the assemblies in parallel It provides a prefabricated grating configured to further comprise a connecting bar for connecting.

Such a prefabricated grating according to the present invention has a more enhanced effect than the pre-registered patent, such as the assembly and separation is very easy and easy, as well as prevents shortening of life even when manufactured in light weight, and at the same time significantly reduced manufacturing costs and maintenance costs. You will get

1 is a perspective view of a prefabricated grating according to the present invention
Figure 2 is a perspective view showing a part of the prefabricated grating of Figure 1 separated
3A and 3B are a perspective view and a side cross-sectional view showing an enlarged excerpt of the main bar in the prefabricated grating of FIG.
Figures 4a, b is a perspective view and a side view showing an enlarged excerpt of the crossbar in the prefabricated grating of Figure 1
Figure 5a, b is a perspective view and a side cross-sectional view showing an enlarged excerpt of the fixed bar in the prefabricated grating of Figure 1
Figure 6a, b is a perspective view and a side view showing an enlarged excerpt of the front and rear members of the frame in the prefabricated grating of Figure 1
Figure 7 is an enlarged perspective view of the left and right members of the frame in the prefabricated grating of Figure 1
8 is a perspective view illustrating a state in which the main bar and the cross bar are assembled;
Figure 9a, b is a perspective view showing a state of assembling the fixed bar at both ends of the crossbar assembled with the main bar
FIG. 10 is a side view partially cut away showing a state in which an assembly assembled by FIGS. 9A and 9B is mounted on a frame; FIG.
FIG. 11 is a side view of a cutaway example of an installation state of the prefabricated grating manufactured by FIG. 10. FIG.
12a to c are side and perspective views showing enlarged different examples of the main bar.
Figure 13a, b is a perspective view showing an enlarged connection bar applied to the prefabricated grating of Figure 1 and a side view showing a state of use

Or less, on the basis of the accompanying drawings of the prefabricated grating according to the present invention in detail as follows.

1 is a perspective view of a prefabricated grating according to the present invention, Figure 2 is a perspective view showing a part of the prefabricated grating of FIG.

Prefabricated grating according to the present invention of Figures 1 and 2, the main bar 10, the crossbars 20 for binding and fastening the main bars are arranged at a predetermined interval, and at both ends of the crossbars for binding the main bars, respectively It is configured to include a fixed bar 30 to be attached and the frame 40 to which the main bar is mounted.

3A and 3B are a perspective view and a side cross-sectional view of an enlarged view of the main bar in the prefabricated grating of FIG. 1, and FIGS. 4A and 4B are a perspective view and a side view of an enlarged view of the crossbar in the prefabricated grating of FIG. 1.

"형태를 이루게 압출 형성된다.The main bar 10 includes an upper piece 11 having an upper surface of an uneven surface, a fixing portion 12 extending downwardly from the middle of the lower surface of the upper piece to a lower portion, and a lower thickness from a lower end of the fixing portion. A binding portion 13 extending downward with the same thickness and a reinforcing portion 14 thicker than the thickness of the lower end at the lower end of the binding portion are provided so that the side cross section is approximately "

"Extruded to form.

The main bar 10 is to be used to cut to the required length according to the specifications of the grating, the coupling hole 15 is drilled at a predetermined interval to the binding portion 13 and coupled to penetrate the crossbar 20, respectively, and the It is further provided with a through hole 16 of the binding piece 21 formed in the crossbar formed laterally cut in one side of the coupling hole as described later.

Crossbar 20, the binding piece 21 is protruded in the longitudinal direction on the outer surface, the diameter is extruded in the form of a roll proportional to the inner diameter of the coupling hole 15 is used to cut to the required length, the binding piece It is formed with an incision at intervals to rotate the crossbar in a counterclockwise direction by 90 ° to have a binding groove portion 22 to bind the periphery of each coupling hole, and screw fasteners 23 formed in both ends recessed to a predetermined depth from the outer surface, do.

"형태를 이루게 돌출되며, 이에 따라 관통구(16)는 상기 결속편의 측단면 형태와 동일하게 형성된다.The binding piece 21 is thickened to the outer end so that the side cross section "

"Protruding to form, so that the through hole 16 is formed in the same shape as the side cross-section of the binding piece.

In addition, the binding groove 22 is formed in such a way that the gap between the two sides 221, 222 extending upward from the both ends of the bottom to be the interval corresponding to the bottom thickness of the fixing portion 12 is opened toward the top.

At this time, the two sides (221, 222) is formed to be inclined at the same angle to each other or one side of the two sides of the vertical or steep inclination, while the other side may be formed to be inclined at a gentle angle, accordingly to the lower The shape of the fixing part 12 extending downward to narrow the thickness is formed corresponding to the shape of the binding groove.

Forming the fixing portion 12, the binding piece 21 and the binding groove 22 in such a form, the plurality of main bars 10 cut equally to the required length arranged at a predetermined interval crossbar 20 When fastening and fastening by using a wider area, the fixing part, the binding piece, and the binding groove part increase the contact area with each other, and at the same time, they are respectively triangular or trapezoidal, so that their strength and stress are strengthened as much as possible. This is to prevent the phenomenon such as being easily deformed or broken even when an impact or vibration is applied.

5A and 5B are a perspective view and a side cross-sectional view showing an enlarged excerpt of the fixing bar in the prefabricated grating of FIG. 1.

"형태를 이루게 압출 형성된다.The fixing bar 30 includes an upper plate 31 having an upper surface of an uneven surface, a fixing plate 32 extending two-fold vertically and horizontally from the outer end of the upper plate to a height lower than the upper plate, and a middle of the lower surface of the upper plate. A vertical plate 33 extending downward from the portion, a lower plate 34 extending horizontally from the lower end of the vertical plate, a coupling groove 35 recessed in the longitudinal direction on the lower surface of the lower plate, and the vertical plate. The side cross section is provided with a reinforcement projection 36 formed in the longitudinal direction in the middle of the outer surface thereof.

"Extruded to form.

"형태를 이루게 길이방향으로 연장형성되는 결착홈부(37)와, 수직판(33)의 보강돌기(36)와 하판(34)들 사이에 메인바(10)의 각 결합공(15)들에 결합하는 크로스바(20)들 각 양단부의 나사체결구(23)에 대응하는 간격으로 천공되는 나사공(38)들과, 결합홈부(35)와 상기 결착홈부에 각각 결합되어 완충 및 소음발생 등을 방지하게 고탄성의 실리콘 등으로 길게 형성되어 필요한 길이로 절단 사용하는 탄성부재(39)(39')를 더 구비하여 된다.In addition, the fixing bar 30 has a side cross section at the outer end of the fixing plate 32 "

In the coupling grooves 15 of the main bar 10 between the binding groove 37 extending in the longitudinal direction to form a shape, and the reinforcing projection 36 and the lower plate 34 of the vertical plate 33. Screw holes 38 drilled at intervals corresponding to the screw fasteners 23 at each end of each of the crossbars 20 to be coupled to each other, and the coupling groove 35 and the binding groove are respectively coupled to cushion and generate noise. It is further provided with an elastic member 39 (39 ') which is formed to be made of highly elastic silicone or the like and cut to a required length.

"형태로 형성되어 상부분을 결합홈부(35)에 결합하면 곡면으로 된 하부분이 하방으로 노출된다.When the elastic member 39 is formed in a circular cross section, the upper end portion is exposed upward through the isolated upper portion of the binding groove portion when the binding groove portion 37 is bound, and the elastic member 39 'has a side cross section ".

"Formed in the form, when the upper portion is coupled to the coupling groove 35, the lower portion of the curved surface is exposed downward.

6A and 6B are a perspective view and a side view showing an enlarged extract of the front and rear members of the frame in the prefabricated grating of FIG. 1, and FIG. 7 is a perspective view showing an enlarged excerpt of the left and right members of the frame in the prefabricated grating of FIG.

The frame 40 is formed in a rectangular shape by attaching both ends of the front and rear members 41 and 41 'and the left and right members 42 and 42' to each other.

"형태를 이루게 압출 형성되며, 필요한 길이로 절단하여 사용하면 된다.The front and rear members 41 and 41 ′ have an upper side portion 411, a side side portion 412 extending vertically downward from the outer end of the upper side portion, and horizontally extended inward to face the upper side portion at the lower end of the side side portion. And a lower piece portion 413 and a fixing piece portion 414 extending inwardly from the inner end portion of the lower piece portion with a height lower than that of the lower portion portion.

"Extruded to form, it can be cut to the required length.

"형태로 압출 형성되어 필요한 길이로 절단하여 사용하는 것이며, 필요에 따라서는 전후부재(41)(41')를 이용하여도 된다.The left and right members 42 and 42 'include a vertical side piece 421 and a horizontal lower piece 422 horizontally extending from the lower end to the inner side thereof.

It is extruded and formed into a shape, and it cut | disconnects to a required length, and may use the front-back member 41 and 41 'as needed.

Figure 8 is a perspective view showing a state of assembling the main bar and the crossbar, Figure 9a, b is a perspective view showing a state of assembling the fixed bar at both ends of the crossbar dlm assembled with the main bar, Figure 10 is an assembly assembled by Figures 9a, b Is a side view showing a part of the cut state mounted on the frame, Figure 11 is a side view showing a partially cut example of the installation state of the prefabricated grating manufactured by FIG.

When assembling the main bar 10, the crossbar 20, and the fixed bar 30 and the frame 40 to prepare the grating, a jig provided with a plurality of the main bar cut to the same length at a predetermined interval on the workbench To seat in parallel,

When seated in this way, the coupling holes 15 and the through holes 16 drilled at regular intervals on the main bars 10 are all aligned on the same line, and the through holes 16 are all in a horizontal state. do.

In this state, the crossbars cut so as to have a length l plus two intervals of the intervals s' between the main bars and the front and rear intervals s of the main bars 10 seated at regular intervals ( 20 are coupled to each coupling hole 15 so that the binding piece 21 penetrates the through hole 16.

When the coupling grooves 22 formed in the coupling bars 21 at regular intervals on each of the binding pieces 21 of the crossbars 20 are positioned in the respective coupling holes 15 drilled in the main bars 10, the crossbars may be 90 degrees. The rotation grooves are rotated by ° so that the front and rear surfaces of each of the coupling holes are fitted between the two surfaces 221 and 222 so as to be engaged with each other.

In this case, the length of the crossbars 20 is the length l plus two intervals of the intervals s' between the mainbars to the front and rear intervals s of the main bars 10 seated at regular intervals. Since both ends 20a and 20b of the crossbars pass through the front and rear main bars of the main bars, the front and rear main bars are exposed by one of the intervals between the main bars.

In this state, the screw holes 38 are held in close contact with each other before and after each of the two fixed bars 30 cut equally to the length of the main bars 10 to cross each end of the cross bars 20 in the longitudinal direction. The binding screw 24 is fastened to each other by coinciding with the screw fastening holes 23 formed at both ends 20a and 20b of the crossbars.

When fastening the binding screw 24 in this way, the lower end is in close contact with the upper surface of the lower plate 34, the upper end of the washer 25 of the size of the rectangular shape that is in close contact with the lower surface of the reinforcing projection (36) screw hole 38 The fastening is interposed on the outer surface of the vertical plate 33 of the perforated portion so that the phenomenon that the crossbar 20 is arbitrarily rotated or the screw is released by the external force during use does not occur at all.

Therefore, the main bar 10 and the crossbars 20 are tightly fixed by the fixing bar 30 to be an assembly A of one body, wherein the spacing between the fixing bar and the front and rear main bars is between the main bars. It is equal to the interval of.

When mounting the assembled assembly (A) to the frame 40 as described above, first, if necessary, the screw fastening holes 43 are drilled at regular intervals to the fixing piece portions 414 of the front and rear members 41 and 41 '. If necessary, the frame may be fixed by fastening the fixing screw to the floor through a screw fastening hole.

Afterwards, the fixing plates 32 to which the elastic members 39 are attached are located below the upper upper portions 411 of the front and rear members 41 and 41 ', respectively, and the lower plates 34 to which the elastic members 39' are coupled to each other. The assembly A is inserted into the frame 40 so as to be positioned above the lower portions 413 of the front and rear members, respectively.

When inserted in this way, the upper portion of the elastic member 39 is compressed to the lower surface of each of the upper portion 411, the lower portion of the curved surface of the elastic member 39 'is coupled to the upper surface of the lower portion 413 is compressed (A) is stably mounted on the frame 40 to produce one grating.

When installing the grating produced in this way, When the front and rear members 41 and 41 'are respectively seated on the stepped parts 2 and 2' respectively formed on the front and rear inner surface upper portions of the sewer or the drain 1 installed on the floor, the grating crosses the upper part of the drain. Is installed.

In such a state, when the fixing screw is fastened to the floor through the screw fastening hole 43 as necessary, the grating is firmly fixed to the drain hole.

The grating according to the present invention installed and used is very easy and easy to assemble and separate, as well as to prevent shortening of life even when manufactured in light weight, and at the same time, the manufacturing cost and maintenance cost are greatly reduced. will be.

12A to 12C are enlarged side and perspective views of different examples of the main bar.

The main member 10 of FIG. 12A does not have an upper portion 11 having irregularities formed on the upper surface thereof, and extends upwardly so that both sides of the fixing portion 12 become thicker toward the upper portion, thereby forming irregularities on the upper surface thereof. It is characterized by.

The main member 10 of FIG. 12 is characterized in that the upper piece 11 having irregularities formed on the upper surface thereof is horizontally extended from the upper end of the fixing part 12 to either front or rear.

In the main member 10 of FIG. 12C, the fixing part 12 extends downwardly vertically thicker than the thickness of the binding part 13 in the middle of the lower surface of the upper piece 11 where the unevenness is formed on the upper surface, and the lower end of the fixing part. Front and rear connecting portion 10a of the upper and the binding portion is formed to have a curved shape, and thus the binding groove portion 22 formed in the binding piece 21 of the crossbar 20 is also connected to the binding portion and the front and rear connection portions. It is characterized by being formed corresponding to the shape.

Figure 13a, b is a side view showing a perspective view and a state of use of an enlarged connecting bar applied to the prefabricated grating of Figure 1;

Connection bar 50 according to the present invention of Figure 13a, b, the back and forth intervals of the grating, such as when the front and rear width of the drain or drainage (1) is installed to support the middle of the grating when installed to install corresponding to the front and rear width If not installed, the stress in the middle part is relatively lower than that of the edge, thereby preventing the settling phenomenon from occurring.

"형태로 압출 형성된다.The connection bar 50 includes an upper plate portion 51, a vertical plate portion 52 extending downward from the middle of the lower surface of the upper plate portion, and a lower plate portion 53 extending horizontally back and forth wider than the upper plate portion at the lower end of the vertical plate portion. And fixed plate portions 54 and 54 ', which are lower than the lower plate portion and narrow in the front and rear widths, respectively, at the front and rear ends of the lower plate portion.

Extruded form.

When using such a connecting bar 50, when the front and rear width of the sewer or drain 1 is widely installed, the partition 3 is installed so as to cross the middle thereof in the longitudinal direction, and correspondingly, the front and rear width of the grating is described above. When manufactured in proportion to the front and rear widths of the sewers or drains, the main bars 10 and the crossbars 20 arranged in parallel are separated into two front and rear portions, and at the same time, each of the front and rear ends of the crossbars has a fixed bar ( 30 are brought into close contact with each other before and after they cross each other in the lengthwise direction to face each other, and the screw holes 38 coincide with the screw fasteners 23 formed at each end portion 20a, 20b of the crossbars. ) And fasten each one.

In addition, the connecting bar 50 cut to the same length as the main bar 10 is interposed between the fixing bars 30 fixed to the front and rear ends corresponding to each other of the cross bars 20, and fixed to the front and rear ends. The fixing plates 32 to which the elastic members 39 of the fixing bars are bound are respectively located below the upper plate portions 51, and the lower plates 34 to which the elastic members 39 ′ are coupled are respectively positioned above the lower plate portions 53. To combine.

When combined in this way, the upper portion of the elastic member 39 is pressed to the lower surface of each upper plate portion 51, the lower portion of the curved surface of the elastic member 39 'is pressed to the upper surface of the lower plate portion 53 so that the connection bar ( An assembly (A) 50 is stably coupled in the middle between the front and rear fixing bars 30, and when the assembly is mounted on a frame formed corresponding to the size of the assembly, a connecting bar is interposed in the middle. Grating is produced.

When the grating is installed in the sewer or drain 1 having a wide front and rear width, the fixing plate portion 54 (54 ') is disposed with the lower surface of the connecting bar 50 interposed in the middle seated on the upper surface of the partition 3. ) Is firmly installed by fixing the upper surface of the partition wall with a screw.

Accordingly, the connecting bar 50 supports the middle portion of the grating made with a wide front and rear space so that the middle portion does not fall even when used for a long time, thereby effectively preventing life shortening.

10: main bar 11: upper part
12: fixed portion 13: binding portion
15: coupling hole 16: through hole
20: crossbar 21: binding
22: binding groove 23: screw fasteners
30: fixed bar 31: the top plate
32: fixed plate 33: vertical plate
34: lower plate 35: coupling groove
36: reinforcement projection 37: binding groove
38: screw hole 39,39 ': elastic member
40: frame 41,41 ': front and rear member
42,42 ': Left and right member 50 connecting bar
51: upper plate portion 52: vertical plate portion
53: Lower plate 54,54 'fixed plate
411: upper portion 412: side portion
413: lower part 414: fixed part

Claims (9)

A fixing part 12, a binding part 13 extending downward from the lower end of the fixing part 12, a reinforcing part 14 formed thicker than a thickness of the binding part at the lower end of the binding part, and the binding part ( A main bar 10 having a coupling hole 15 drilled at a predetermined interval in the 13 and a through hole 16 formed to be horizontally cut at one side of the coupling hole 15;
When the diameter is formed in the shape of a roll proportional to the inner diameter of the coupling hole 15, when the plurality of main bars 10 are arranged in parallel to each other through the coupling holes 15 are located on the same line, respectively The coupling piece 21 is formed to protrude in the longitudinal direction to penetrate the through hole 16 on the outer surface, and the coupling pieces 15 are formed by cutting at a predetermined interval on the binding piece 21 and rotating counterclockwise. Crossbars 20 which is provided with a coupling groove portion 22 is inserted into each of the circumferential end of the coupling portion, and a screw fastener 23 is formed recessed at both ends;
Upper plate 31, a fixed plate 32 is bent and extended in two stages vertically and horizontally lower than the upper plate 31 from the outer end of the upper plate 31, and downward from the middle portion of the lower surface of the upper plate 31 An extended vertical plate 33, a lower plate 34 extending horizontally from the lower end of the vertical plate 33 to the outside, a reinforcement protrusion 36 formed in the middle of the outer surface of the vertical plate 33, and the fixing plate Vertical grooves 33 at intervals corresponding to the fastening grooves 37 extending at the outer ends of the ends 32 and the screw fasteners 23 at both ends of the crossbars 20 coupled to the respective coupling holes 15. A fixing bar 30 which is drilled in the lower part and has a screw hole 38 fixed to the front and rear to cross the both ends of the crossbars 20 by fastening the fixing screws to the respective screw fasteners 23;
The lower side portion 412 which extends vertically downward from the outer end of the upper side portion 411 and the upper side portion 411 and the lower side portion extending horizontally inward to face the upper side portion 411 at the lower end of the side side portion 412 ( 413 and the front and rear members 41, 41 ', which are provided with a fixing piece portion 414 extending inward at a lower level than the lower piece portion 413 at an inner end of the lower piece portion 413, and a vertical side piece 421. And both ends of the left and right members 42 and 42 'each having a horizontal lower piece 422 horizontally extending from the lower end to the inner side of the vertical side piece 421 are formed in a rectangular shape, and the main bar 10 ) And a frame 40 for mounting therein an assembly A in which crossbars 20 coupled to each coupling hole 15 of the main bar 10 are respectively fixed to the fixing bars 30 at both ends thereof. Prefabricated grating, characterized in that configured to The method of claim 1,
The main bar 10, the upper end of the fixing part 12 is further provided with an upper piece 11 to extend downward from the middle of the lower side cross section "

"Formed to form;
The fixing part 12 is extended downward so that its thickness becomes narrower toward the lower side, and the binding part 13 is extended downward to the same thickness as the bottom thickness of the fixing part 12;
Bonding piece 21 of the crossbar 20, prefabricated grating, characterized in that formed to correspond to the shape of the fixing portion 12 is extended downward to become narrower toward the lower portion of the fixing portion 12 , The method of claim 1,
The binding groove portion 22 is formed to be inclined at the same angle to each other, the shape of the two sides open, or one side of the two sides are formed to be inclined at a gentle angle while the other side is vertical or steep slope,
Prefabricated grating, characterized in that the thickness of the fixing portion 12 is formed to correspond to the shape of the binding groove 22, The method of claim 1,
The main member 10, prefabricated grating, characterized in that the upper piece 11 is formed on the upper end of the fixing part 12 so as to extend horizontally in either front and rear, The method of claim 1,
The main member 10, the fixing portion 12 is vertically extended downwardly thicker than the thickness of the binding portion 13 in the middle of the lower surface of the upper piece 11, the irregularities are formed on the upper surface, of the fixing portion 12 Front and rear connecting portion (10a) of the lower end and the binding portion 13 is formed to have a curved surface;
Bonding piece 21 of the crossbar 20, prefabricated grating, characterized in that formed to correspond to the form of the binding portion 13 and the front and rear connecting portion, The method of claim 1,
The fixing bar 30 has a side cross section at the outer end of the fixing plate 32 "

"Blocking groove portion 37 is formed to extend in the longitudinal direction to form a shape, characterized in that it further comprises an elastic member 39 is coupled to the binding groove portion 37 is formed to prevent the buffer and noise generation, etc. Prefab grating, The method of claim 1,
The fixing bar 30, the coupling groove 35 is formed in the longitudinal direction on the lower surface of the lower plate 34 and the elastic member is coupled to the coupling groove 35 to prevent the buffer and noise generation, etc. Prefabricated grating, characterized in that it further comprises (39) (39 '), The method of claim 1,
Prefabricated grating, characterized in that it further comprises a connection bar 50 for connecting the assembly (A) in parallel to the main bar 10 and the crossbar 20 to be fixed to the fixed bar 30, The method of claim 9,
The connecting bar 50 has an upper and lower width than the upper plate portion 51, a vertical plate portion 52 extending downward from the middle of the lower surface of the upper plate portion 51, and an upper plate portion 51 at the lower end of the vertical plate portion 52. It is provided with a lower plate portion 53, which is horizontally extended back and forth horizontally, and fixed plate portions 54, 54 'which are lower than the lower plate portion 53 and narrow in front and rear width at the front and rear ends of the lower plate portion 53, respectively. The fixing plates 32 of the fixing bars 30 fixed to the front and rear ends of the assembly A are respectively located below the upper plate portions 51 and the lower plates 34 are respectively coupled to be positioned above the lower plate portions 53. Prefabricated grating, characterized in that it is configured to connect the assemblies (A) in parallel

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