JPH0810880A - Grating and assembling method and assembling device - Google Patents

Abstract

PURPOSE:To simply and surely assemble a grating by pressing a cross tube penetrating main bars arranged parallel so as to cross orthogonally through a joining hole into a large ellipse like whose major axis is lager than the diameter of the joining hole. CONSTITUTION:Plural places of joining holes 2c are created on a web 2b of main bars 2 of stainless steel long sideways plate like, many sheets are arranged parallel, and the joining holes are penetrated crossing orthogonally with a cross tube 3 of stainless steel. Mutual interval parts 3a of respective main bars are deformed plastically into an almost oblate spheroidal cross section whose major axis is some larger than the inner diameter of the joining hole 2c with a clamping press, assembled in a grating-like and fixed. Due to such a grating assembling method, fixing with welding is made needless, the change of color caused on welding heat or stripping generating of jarring metal sound caused on defective welding are made to nothing, and assembling can be executed efficiently with a simple method and a small energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel grating which is mainly fitted in a side groove of a road surface, a drain groove inside and outside a building, an assembling method thereof and an assembling apparatus thereof.

[0002]

2. Description of the Related Art Generally, this type of grating is disclosed in, for example, Japanese Patent Publication No. 4-4076, and a large number of main bars arranged in parallel at equal intervals and connecting holes or connecting holes for these main bars. Welded end plates on both sides (both ends of the main bar), forming a grid consisting of a plurality of cross bars that are fixed to each main bar by welding and are inserted through the grooves in orthogonal directions. Is configured. Then, they are laid so as to be fitted individually or in a large number so as to be fitted into the receiving frames at both side edge portions such as the side grooves on the road surface and the drain grooves inside and outside the building.

The main bar is a plate-like member that mainly supports the load of pedestrians, and the cross bar connects the main bars in parallel at equal intervals. In addition, recently, end plates made of stainless steel, which are excellent in aesthetics, are becoming popular.

[0004]

By the way, in the above-mentioned conventional stainless steel grating, a large number of main bars and a plurality of cross bars are fixed by welding. However, the welding is difficult and Technology is required, and there are a large number of welding points.When welding is performed by a welding worker, it is very time-consuming, inefficient, and costly to manufacture. There is a problem that the main bar and the cross bar are loosened during use and an unpleasant metallic sound such as "chareen, chareen" is generated, and further, the discoloration of the stainless member due to welding heat occurs. However, there was a problem of impairing the design.

There is also a method for efficiently assembling the grating by welding the connecting portion between the main bar and the cross bar at a time by using an automatic welding machine, but this method involves complicated welding in which a large number of electrode rods are arranged. A machine is required, the equipment cost is very high, and the crossbar is moderately pressed into the groove with ridges on the main bar, while excess current is passed from the electrode rod to perform resistance welding. It is difficult to control technology such as safety control and safety management, and high technology is required.

The present invention has been made in view of the above circumstances, and it is an object of the present invention that welding of each main bar and a cross member is not necessary, and both the main bar and the cross member can be easily and surely connected and fixed without a high technique. It is assembled into a shape, and there is no concern about discoloration due to welding heat or peeling due to poor welding / unpleasant metal noise.
The main bar and the cross member are firmly connected to each other to provide a grating having a very high product value at a low cost. Another object of the present invention is to provide an optimum assembling method and apparatus for assembling and manufacturing the above grating very efficiently and at low cost with a small amount of energy.

[0007]

In order to achieve the above-mentioned object, the grating of the present invention is provided with a large number of stainless steel main bars arranged in parallel at equal intervals and with respect to these main bars. Hollow circular stainless steel tubes inserted through the connecting holes in orthogonal directions, and plastic deformation of each main bar between the main bars into a substantially oval cross section with a major axis slightly larger than the inner diameter of the connecting hole by a pressing press. It is characterized in that each main bar and a plurality of fixed fixed cross pipes are provided and assembled in a lattice shape.

According to the grating having such a structure, a cross pipe made of a hollow stainless steel tube is used as a cross member that is inserted into a plurality of stainless main bars arranged in parallel in a state orthogonal to each other. Each main bar was assembled and fixed in a lattice shape by plastically deforming the section between the main bars of the pipe by a pressing press into a cross section with a major axis slightly larger than the inner diameter of the connecting hole to form a substantially elliptical shape. It does not require welding with a cross pipe, which is a cross member, and can simply and securely bond and fix both without the need for advanced technology simply by pressing the cross pipe, and peeling due to discoloration due to welding heat or poor welding.・ No more worries about unpleasant metallic noise.

Further, since the cross pipe consisting of a hollow round pipe is only plastically deformed into a substantially vertically elliptical cross section having a major axis slightly larger than the inner diameter of the hole of the main bar by a pressing press,
Compared to plastic deformation of a solid bar by a pressing press, it requires less energy, assembly and production is easier and cost can be reduced, and plastic deformation is sufficient to prevent cracks and scratches on the cross pipe. No stress corrosion occurs in the cross pipe, and the material characteristics of stainless steel can be utilized.

Moreover, since the cross pipe is plastically deformed in the vertical direction to make the cross-section vertically long and elliptical, the load distribution in the use condition is improved, and the main bar and the cross pipe are firmly connected to each other. Will be a high-grade product.

In the assembling method of the grating of the present invention, a large number of stainless steel main bars each having connecting holes formed at a plurality of positions are held in parallel at equal intervals by an assembling jig, and the main bars are connected to each other. On the other hand, a plurality of cross pipes made of stainless steel hollow round tubes are inserted in a state of being orthogonal to each other through the connecting holes to form a lattice state, and in this state, a pair of comb-teeth pressing dies are used to cross each main bar of the cross pipes. It is characterized in that the cross pipe and each main bar are fixed to each other and assembled in a lattice shape by plastically deforming the cross-section with a major axis slightly larger than the inner diameter of the connecting hole into a substantially elliptical cross-section by pressing the space portion. And

According to such an assembling method, a large number of main bars and cross pipes can be easily held in a lattice state by an assembling jig, and the portions between the main bars of the cross pipes can be pressed as they are with a pair of comb teeth. The die is pressed at a stretch by a die and plastically deformed into a substantially elliptical cross section with a major axis slightly larger than the inner diameter of the connecting hole of the main bar, and the cross pipe and each main bar are easily grid-shaped without using welding means. It is possible to assemble and fix in a fixed shape, and it is possible to assemble and manufacture a high-grade grating with extremely high efficiency and a small energy as described above.

In the grating assembling apparatus of the present invention, a large number of stainless steel main bars each having connecting holes formed at a plurality of positions are held in parallel at equal intervals, and the connecting holes are connected to the main bars. An assembly jig that can insert a plurality of stainless steel hollow round tubes into a lattice state in a state of being orthogonal to each other, an elevating mechanism that supports and elevates the assembly jig, and an elevating and lowering mechanism. When the mechanism descends or rises, a pair of comb tooth-shaped pressing dies that enter into the jig and face each other between the main bars of the cross pipe from the left and right, and at least one comb tooth-shaped pressing die To the other comb-teeth-shaped die and press between the main bars of the cross pipe to press the other of the cross-pipes together to form a plastic shape of a cross-section with a major axis slightly larger than the inner diameter of the connecting hole. Comprising a hydraulic driving mechanism for deforming.

In the assembling apparatus having such a structure, a large number of main bars and cross pipes can be easily held in a lattice state by an assembling jig, and the assembling jig is supported by an elevating mechanism to descend or rise, As a result, a pair of comb-teeth pressing dies are sandwiched between the main bars of the cross pipe from the left and right, and at least one comb-teeth pressing die is directed to the other comb-teeth pressing die by a hydraulic drive mechanism. Pushing forward, the parts between the main bars of the cross pipe are pressed against each other and plastically deformed into a substantially elliptical cross section with a major axis slightly larger than the inner diameter of the connecting hole of the main bar. It is suitable for easy assembling and manufacturing with a small amount of energy.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. First, the grating 1 according to the present invention will be described with reference to FIGS. 1 and 2.
State. 1 is a partial cross-sectional view showing the assembly process of the grating, and FIG. 2 is a perspective view with a part of the grating 1 omitted, showing a plurality of main bars 2, a cross pipe 3 as a plurality of cross members, and a pair of left and right parts. And the end plate 4 of.

The main bar 2 has a flange-shaped flat portion 2a whose upper surface is non-slip processed (not shown).
Is a horizontally long plate made of stainless steel having a substantially T-shaped cross section, and connection holes 2c are formed by punching at a plurality of locations on the web portion 2b, for example, at a total of three locations in the middle in the longitudinal direction and portions near both ends. A large number of main bars 2 are prepared, for example, 50 sheets, which are arranged in parallel at equal intervals (10 mm to 30 mm pitch).

The cross pipes 3 are hollow stainless steel pipes, and a plurality of such pipes, for example, three pipes are provided. Each of the cross pipes 3 penetrates the main bar 2 at right angles through the connecting holes 2c in a skewered manner. Is inserted.

The cross pipe 3 has a wall thickness of 1 mm.
The diameter (outer diameter) of the connecting hole 2c of the main bar 2 is approximately
It is set slightly smaller (for example, 0.3 to 0.5 mm) than the inner diameter of. For example, the inner diameter of the connecting hole 2c of the main bar 2 is set to 10,5 mm while the diameter of the cross pipe 3 is 10 mm,
First, as shown in FIG. 1A, the cross pipe 3 is first connected to the connecting hole 2.
It can be easily inserted into c.

These cross pipes 3 are inserted into the connecting holes 2c of the respective main bars 2 and temporarily assembled in a lattice shape, as shown in FIGS. 1 (b) and 1 (c), by means to be described later. The inter-parts 3a of the respective main bars 2 are plastically deformed by a pinching press into a substantially elliptical cross section having a major axis (for example, 11.5 mm) slightly larger than the inner diameter (10,5 mm) of the connecting hole 2c. The cross pipe 3 and each main bar 2 are fixed to each other and assembled in a lattice shape.

Both ends of each cross pipe 3 are cut flush with the outer surface of the outermost main bar 2.
Only the joint between the main bar 2 at the outer end and each cross pipe 3 is fixed by welding 5 from the inside of the main bar 2. Further, caps 5 are fitted on both ends of each cross pipe 3 in order to enhance the design. The cap 6 is made of a soft metal similar in color to stainless steel, and has a pair of left and right projecting legs 6a on the inner surface, and the left and right gaps between the connecting hole 2c of the main bar 2 and the end of the cross pipe 3 are provided. It is mounted by inserting it into the main bar 2 and bending it inside.

Further, the end plates 4 are finally fixed by welding to both sides (both ends of the main bar 2) of the grid-like body composed of the main bar 2 and the cross pipe 3 to complete the grating. .

Next, an assembling apparatus used for assembling and manufacturing the above-mentioned grating 1 will be described with reference to FIGS. 1 to 3.
3 is a sectional view, FIG. 4 is a plan view, and FIG. 5 is a perspective view. Here, reference numeral 11 in the figure denotes the apparatus main body. The device body 11 has a fixed base 12. This fixed base 12
Is a horizontally long fixed base 13 that is fastened and fixed to the floor of a factory or the like.
And a reinforcing channel member 14 fixed to both ends of the upper part, and a plurality of support plates 15 fixed to the upper side of the reinforcing channel member 14 so as to stand upright with a parallel interval. The support plate 15 is a strength member made of a horizontally long thick steel plate or the like extending over the left and right ends of the fixed base 13, respectively.

An elevating mechanism 16 is provided in the upper left substantially half region of the base 12. This lifting mechanism 16
Is provided with a pair of brackets 17 projecting from the front and rear support plates 15 of the base 11, and air or hydraulic lifting cylinders 18 are erected on these brackets 17, respectively. Lifting cylinder 1
The lifting table 19 is horizontally mounted and supported on the upper end of the piston rod 8. The lift table 19 has an opening 19a that is long in the front-rear direction and is formed substantially in the center.

The lifting table 19 of the lifting mechanism 16 is
The large number of main bars 2 and the plurality of cross pipes 3 are mounted on this upper surface in a state of being temporarily assembled in a lattice shape through an assembling jig 50, which will be described later, and fixed by a lifting cylinder 17 from a predetermined height. The stroke can be lowered and returned to ascend.

A pair of comb-teeth pressing dies 21 and 22 are provided on the upper portion of the base 12 (the lower portion of the elevating table 18).
Is provided. These comb-tooth-shaped pressing dies 21 and 22 are tough dies, each having a horizontally long plate-like shape, and having a large number of protruding tooth-shaped portions 21a and 22a on the upper part thereof. These protruding tooth portions 21a and 22a are reinforced by quenching. The protruding tooth patterns 21a and 22 of the comb tooth-shaped pressing dies 21 and 22
a is arranged at the same pitch as that of the main bar 2, the groove width between the teeth thereof is set to be slightly larger than the thickness of the web portion 2b of the main bar 2, and the protruding tooth portions 21a and 22a of both are The main pipes 2b of the main bar 2 are not in contact with each other, but the inter-main bar portions 3 of the cross pipe 3 are
It is arranged to face the state where a is sandwiched as wide as possible from the left and right.

One of the comb-teeth pressing dies 21 is a fixed die,
This is fixed by screws to a fixed platen 23 which also serves as a strong die mounting base and is laid horizontally in the shape of a sleeper on the L-shaped step portion 15a on one end side (left end) of each support plate 15 of the base 12. The other comb tooth-shaped pressing die 22 is a movable die. As for this mounting method,
A horizontal shaft 25 is attached to the bottom of the base 12 via a bracket 24.
A plurality of rotating arms 26 are erected on the horizontal axis with their lower ends pivoted in parallel with each other at parallel intervals. A die mounting base 27 is fixedly mounted, and the movable comb-teeth pressing die 22 is screwed and fixed thereto.

A hydraulic drive mechanism 30 is provided in the upper right half of the base 12 as a means for pushing the movable comb-teeth pressing die 22 toward the fixed comb-teeth pressing die 21. The hydraulic drive mechanism 30 has a sleeper-like strong fixed plate 31 horizontally mounted on the L-shaped stepped portion 15b on the other end side (right end) of each support plate 15 of the base 12, and a T-shaped bracket 32 mounted on the fixed platen 31. A plurality of hydraulic cylinders 33, for example, three hydraulic cylinders 33 are provided so as to be swingable by pivotally attaching the base end portion via a shaft 32a via a T-shaped joint 34 at the tip of the plunger rod 33a of these hydraulic cylinders 33. The T-shaped joint 34 is connected to the U-shaped bracket 35 protruding from the die mount 27 on the back side by a pivot 36.

Each hydraulic cylinder 3 of this hydraulic drive mechanism 30
3 pushes (extends) when the elevating mechanism 16 descends, so that the movable comb-teeth pressing die 22 together with the die mount 27 via the rotating arm 26 is suitable for the fixed comb-teeth pushing die 21. The stroke is moved so that the movable comb-shaped pressing die 2 is moved.
2 and the fixed comb-shaped pressing die 21 protrude into the upper assembly jig 50 through the opening 19a of the elevating table 19 when the elevating mechanism 16 descends, and the main pipe inter-parts 3a of the cross pipe 3 between the main bars. It will be in a state of sandwiching from the left and right. In this state, each hydraulic cylinder 33 further presses (extends) to move the movable comb-teeth pressing die 22 toward the fixed comb-teeth pressing die 21 to move the main-bar interspace 3a of the cross pipe 3 to each other. It is designed to press under pressure. The operations of the hydraulic drive mechanism 30 and the elevating mechanism 16 are automatically controlled in association with the operation of a controller (not shown).

An auxiliary table 41 is installed as shown in FIG. 5 adjacent to the front of the apparatus body 11 at a right angle. The auxiliary table 41 is a long table having substantially the same height as the elevating table 19 when the elevating mechanism 16 of the apparatus body 11 is elevated, and has a pair of left and right slide rails 42 using ball bearings on the upper part thereof. The assembly jig 50 is mounted on the rail 42.

The assembling jig 50 has a rectangular frame shape.
A pair of left and right holding members 52 having receiving grooves 52a at equal pitches are provided in the inner portions of the left and right frame members 51 facing each other by a biasing member (not shown) such as a spring that presses at least one of the holding members 52 inward. Are prepared. This left and right pressing member 5
By dropping the large number of main bars 2 in the two receiving grooves 52a while standing upright, the main bars 2 are held in parallel at a predetermined equal interval. Further, in this state, the cross pipes can be inserted into the respective main bars 2 so as to be orthogonal to the main bars 2 via the connection holes 2c, thereby forming a lattice state.

An assembling method for assembling and manufacturing the grating 1 using the above-described grating assembling apparatus will be described. First, a worker inserts a large number of stainless steel main bars 2 each having a plurality of connecting holes 2c as described above into the assembly jig 50 on the auxiliary table 41 and holds them in parallel at equal intervals. At the same time, a plurality of stainless cross pipes 3 are inserted into the main bar 2 in a state of being orthogonal to the main bar 2 through the connecting holes 2c in a skewered state and temporarily assembled in a lattice shape.

While holding the temporarily assembled multiple main bars 2 and the plurality of cross pipes 3 in the lattice state by the assembly jig 50, the left and right slide rails 42 are slid while the auxiliary table 41 is placed on the main body 11 of the apparatus. Lifting mechanism 1
6 is placed on the lifting table 19 of FIG.

Then, the assembling jig 50 is moved forward and backward and right and left so that the first one cross pipe 3 is moved up and down.
Positioning is performed so as to be right above the center of the opening 19a of the nine. In this state, the controllers of the hydraulic drive mechanism 30 and the lifting mechanism 16 are operated. As a result, each hydraulic cylinder 33 of the hydraulic drive mechanism 30 presses (extends), and the rotating arm 26
The movable comb-teeth pressing die 22 together with the die attachment base 27 is appropriately moved to the fixed comb-teeth pushing die 21 through the die, and the four elevating cylinders 19 of the elevating mechanism 16 are shortened to raise and lower the table 19. Is lowered from a predetermined height to a fixed position.

Thus, the movable comb-teeth pressing die 22 together with the fixed comb-teeth pressing die 21 is provided with the opening 19a of the elevating table 19.
It enters into the above-mentioned assembly jig 50 through the upper side and sandwiches the inter-main-bar inter-parts 3a of the first one cross pipe 3 from the left and right. Further, each hydraulic cylinder 33 performs a pressing (expanding) operation to move the movable comb-tooth pressing die 22 toward the fixed comb-tooth pressing die 21 so that the main bars of the one cross pipe 3 are connected to each other. The portion 3a is pressed from the left and right. The pressing force at this time may be about 50 tons. As a result, the inter-main-bar inter-parts 3a of the one cross pipe 3
Is plastically deformed into a substantially vertically long elliptical cross section having a major axis slightly larger than the inner diameter of the connecting hole 2c of the main bar 2, whereby the one cross pipe 3 and each main bar 2 are fixed to each other.

Thereafter, the hydraulic cylinders 33 of the hydraulic drive mechanism 30 move backward (shorten) to release the clamping pressure, and the lifting mechanism 16 raises and returns the lifting table 19 to a predetermined height. Then, the worker again moves and adjusts the assembly jig 50 to the left and right, and the next second cross pipe 3 moves to the lifting table 1.
Positioning is performed so as to be right above the center of the opening 19a of the nine. In this state, the controller is operated in the same manner as the previous time to operate the hydraulic drive mechanism 30 and the elevating mechanism 16, and the movable comb-shaped pressing die 22 and the fixed comb-shaped pressing die 21 cause the second cross. The inter-main-bar portions 3a of the pipe 3 are pressed from the left and right to be plastically deformed into a substantially vertically long elliptical cross section having a major axis slightly larger than the inner diameter of the connecting hole 2c of the main bar 2, whereby the second cross. Pipe 3 and each main bar 2
And fix them to each other.

In this manner, the third cross pipe 3 is similarly pressed and pressed to be plastically deformed into a vertically elongated elliptical cross section so as to be fixed to each main bar 2, and the whole is assembled and fixed in a lattice shape.

Such a lattice body is removed from the assembly jig 50, both ends of each cross pipe 3 are cut flush with the outer surface of the outermost main bar 2, and only that portion is welded from the inside of the main bar 2. 5 and fix. Caps 5 are fitted on both ends of each cross pipe 3 in order to enhance the design. Further, the end plates 4 are fixed by welding to both sides of the lattice (both ends of the main bar 2) to complete the grating 1.

According to the grating 1 assembled in this way, the cross pipe 3 made of a hollow stainless steel tube is used as the cross member, and the main bar interspaces 3a of the cross pipes 3 are connected to each other by the pressing press to the inner diameter of the connecting hole 2c. The main bar 2 and the cross pipe 3 are assembled and fixed to each main bar 2 in a lattice shape by plastically deforming the cross section with a slightly larger major axis than the cross pipe 3 without simply welding the main bar 2 and the cross pipe 3. Both of them can be easily and securely firmly fixed together without the need for advanced technology.
There is no need to worry about discoloration due to welding heat or peeling due to poor welding or unpleasant metal noise.

Furthermore, since the hollow round cross pipe 3 is only plastically deformed into a vertically elongated elliptical cross section having a major axis slightly larger than the inner diameter of the hole 2c of the main bar 2 by a compressing press, the solid bar is clamped. Compared to plastically deforming by pressing, less energy is required, assembly and manufacturing is easier and cost can be reduced, and plastic deformation that does not cause cracks and scratches on the cross pipe 3 is sufficient. Stress corrosion does not occur, and the material properties of stainless steel can be utilized.

Moreover, since the cross pipe 3 is plastically deformed in the vertical direction to have a vertically elongated cross section, the load distribution in the use state is improved, and the main bar 2 and the cross pipe 3 are firmly connected. It will be a very beautiful and high-grade product.

Further, it becomes possible to assemble and manufacture the high-grade grating by a simple method with extremely high efficiency and small energy. In the above embodiment, the cross pipe 3 is formed by forming small arc-shaped or triangular notches (not shown) having a depth of about 0.3 mm at the upper and lower edges of the inner periphery of the connection hole 2c of each main bar 2. When the cross-section 3 is plastically deformed to have a vertically long elliptical cross section by the pressing press, the cross pipe 3 bites into the notch so that it can be more firmly fixed to the main bar 2.

In the assembling apparatus of the above embodiment,
When the elevating mechanism 16 descends, a pair of comb-teeth pressing dies 21, 22
While the main bar inter-parts 3a of the cross pipe 3 can be pressed from the left and right, the vertical arrangement relationship between the lifting table 19 of the lifting mechanism 16 and the pair of comb-teeth pressing dies 21, 22 is reversed. It is also possible that the pair of comb-teeth pressing dies 21 and 22 can press the inter-main-bar interspaces 3a of the cross pipe 3 from the left and right when the lifting mechanism 16 is raised. In addition, various changes may be made without departing from the scope of the present invention.

[0043]

Since the assembling method and the assembling apparatus of the present invention are as described above, welding between each main bar and the cross pipe which is the cross member is not necessary, and it is possible to simply press the cross pipe by pressing. Both can be easily and reliably firmly fixed together without the need for advanced technology, eliminating the risk of discoloration due to welding heat or peeling or unpleasant metal noise due to poor welding.

Further, since the cross pipe of the hollow round pipe is only plastically deformed by the pressing press into a substantially elliptical cross section having a major axis slightly larger than the hole inner diameter of the main bar, the solid bar is plastically pressed by the pressing press. It requires less energy than deforming, it is easy to assemble and manufacture, cost can be reduced, and plastic deformation is enough to prevent cracks and scratches on the cross pipe, so stress corrosion occurs on the cross pipe. Instead, the material characteristics of stainless steel can be utilized.

Moreover, since the cross pipe is plastically deformed in the vertical direction to have a vertically elongated cross section, the load distribution in the use condition is improved, and the main bar and the cross pipe are firmly connected to each other, which is very beautiful. Can produce high-grade products efficiently with small energy.

[Brief description of drawings]

FIG. 1 shows an embodiment of the grating of the present invention,
(A) is a partial cross-sectional view of a main bar and a cross pipe before plastic deformation in a loose state, (b) is a partial cross-sectional view of an engagement state of a main bar and a plastically deformed cross pipe,
Similarly, (c) is a cross-sectional view.

FIG. 2 is a perspective view in which a part of the assembled state of the grating of the above embodiment is omitted.

FIG. 3 shows one embodiment of the grating assembling apparatus of the above embodiment, (a) is a partial sectional view of a pressing press state,
(B) is sectional drawing of a press release state.

FIG. 4 is a plan view of the assembling apparatus of the above embodiment with some parts omitted.

FIG. 5 is a perspective view of the assembling apparatus according to the above embodiment.

[Explanation of symbols]

1 ... grating, 2 ... main bar, 2c ... connecting hole, 3
... Cross pipe, 3a ... Intersection between main bars of cross pipe, 16 ... elevating mechanism 21,22 ... comb-shaped pushing die,
30 ... Hydraulic drive mechanism, 50 ... Assembly jig.

Claims (3)

[Claims] 1. A multiplicity of stainless steel main bars arranged in parallel at equal intervals, and hollow hollow stainless steel tubes inserted into the main bars at right angles through connecting holes. Each of the main bars is provided with a plurality of cross pipes fixed to each other by being plastically deformed by a clamping press into a cross-section substantially vertically elliptical shape having a major axis slightly larger than the inner diameter of the connecting hole. Grating characterized by being assembled in a grid pattern. 2. A plurality of stainless steel main bars each having a plurality of connection holes formed therein are held in parallel at equal intervals by an assembly jig, and the main bars are connected to the main holes through the connection holes. A plurality of cross pipes made of stainless steel hollow round tubes are inserted in a state of being orthogonal to each other to form a lattice state, and in this state, a pair of comb tooth-shaped pressing dies is used to press and clamp the respective main bar portions of the cross pipes. As a result, the cross pipe and each main bar are fixed to each other by plastically deforming into a longitudinally elliptical cross section having a major axis slightly larger than the inner diameter of the connecting hole, and the cross pipe is assembled in a lattice shape. 3. A plurality of stainless steel main bars each having a plurality of connection holes formed therein are held in parallel at equal intervals, and are stainless steel in a state orthogonal to these main bars through the connection holes. An assembling jig capable of inserting a plurality of cross pipes made of hollow hollow tubes into a lattice state, an elevating mechanism for supporting and ascending together with the assembling jig, and an ascending / descending mechanism for descending or ascending the ascending / descending mechanism. A pair of comb-teeth pressing dies that rush into the jig and face each other between the main bars of the cross pipe from the left and right, and at least one comb-teeth pressing die is pushed to the other comb-teeth pressing die. And a hydraulic drive mechanism for plastically deforming the cross pipe into a substantially elliptical cross section having a major axis slightly larger than the inner diameter of the connection hole by pressing the main bars of the cross pipe between the main bars and pressing each other. Grating assembly equipment.