JP6713423B2 - Spark scattering prevention box - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark scattering prevention box for preventing sparks generated when a building, for example, an H-shaped steel or the like is fused and welded from scattering around.

Generally, when a building such as H-section steel is fused by using a gas cutting torch or the like, a spark is generated and the spark is scattered around, which is extremely dangerous.

Such a situation also occurs when welding H-section steel or the like using a gas cutting torch or the like.

Therefore, in the related art, as shown in Patent Document 1, a heat-resistant bag is attached to a substantially V-shaped frame portion, and the frame portion is attached to an H-shaped steel flange by a magnet through a band, a chain or the like. There is provided a fireproof cover having a structure in which sparks generated when magnetically fused and melted are dropped into the bag body.

JP, 2004-114082, A

However, in the above-mentioned fire-preventing cover of Patent Document 1, since it is a bag body having an open upper side, it is difficult to reliably catch the scattering of sparks that are generated so as to jump up vigorously when melted.

Moreover, since the fire protection cover of Patent Document 1 must be replaced on the web side when the web is blown, the time and labor required for this work becomes extremely large.

Therefore, the present invention was created in view of the above existing circumstances, and sparks generated around a building, for example, a web of H-shaped steel and a flange are melted and welded. It is an object of the present invention to provide a spark scattering prevention box capable of reliably preventing the above.

The invention of claim 1 according to the present invention is installed so as to cover a predetermined portion of the H-section steel in order to prevent scattering of sparks generated when fusing and welding the H-section steel having flanges at both ends of the web. It is a spark scattering prevention box consisting of a case,
The housing to be attached to the H-section steel is provided with an opening window portion for fusing and welding the flange of the H-section steel from the outside of the case. Also, in order to fuse and cut the web of the H-section steel in the case, a part of the case is provided. The above-mentioned problem is solved by providing an opening/closing door for opening and closing the.

According to the spark scattering prevention box of claim 1, for example, the sparks generated when the web and the flange of the H-shaped steel and the like are melt-cut and welded are dropped into the housing, so that the sparks are reliably prevented from scattering to the periphery. can do.

Further, the invention of claim 2 according to the present invention is provided with flanges at both ends of the web, and in order to prevent the scattering of sparks generated at the time of melting and welding the H-section steel installed in the longitudinal direction, the H-section steel is It is a spark scattering prevention box consisting of a housing attached so as to cover a predetermined part of
The housing attached to the H-section steel has an opening window portion for fusing/welding the flange of the H-section steel from the outside of the case. Further, in order to fuse/cut the web of the H-section steel in the case, an upper part of the case is provided. The above-mentioned problem is solved by providing an opening/closing door for opening and closing the.

According to the spark scattering prevention box of the present invention, the sparks generated when the web and the flange of the H-shaped steel or the like installed in the vertical direction are fused and welded are dropped into the housing, so that the sparks around the spark are prevented. It is possible to reliably prevent scattering.

Furthermore, in the invention of claim 3 according to the present invention, the housing has a state in which the left and right wall surface portions fixed to the flange of the H-shaped steel through the holding fixture, the web and the flange of the H-shaped steel project from the housing. In the above, a pair of doors of a double door type that opens and closes the upper side of the left and right wall parts, and a lower side wall part that closes the lower part of the left and right wall parts when the H-shaped steel web and the flange project from the housing. By providing the front and rear wall surface portions that close the front and rear of the left and right wall surface portions, the above-mentioned problem is solved.

According to the spark scattering prevention box of the third aspect, the single housing attached to the predetermined portion of the H-shaped steel does not particularly need to change the web side and the flange side, and the fusing and welding of the flange and the web are performed. Sparks that sometimes occur can be dropped into the housing to reliably prevent the sparks from scattering around.

Moreover, since it has a pair of double doors that open and close the upper part of the door, it is possible to open either one of the doors for the fusing and welding work of the web such as H-shaped steel installed vertically. Can be implemented easily.

Further, according to the invention of claim 4 of the present invention, the pair of doors of the double door type opens and closes the upper part of the housing in a state where the H-shaped steel web and the flange are projected from the housing. By providing the H-shaped slit corresponding to the outer shape of the shape steel, the above-mentioned problem was solved.

According to the spark scattering prevention box of the fourth aspect, since the H-shaped slit corresponding to the H-shaped steel is provided above the housing, the upper side of the housing is closed by the pair of doors of the double door type. Even when it is present, it is possible to maintain the state in which the H-section steel web and the flange are projected from the housing.

Due to the closed state above the casing, sparks are dropped into the casing while the H-shaped steel flange is being fused and welded through the opening window, and the sparks are emitted from above the casing. It is possible to surely prevent the occurrence of the situation of scattering.

Further, the housing attached to the H-section steel can be moved along the H-section steel, and the fusing/welding work at a desired position can be quickly performed.

Similarly, in the invention of claim 5 according to the present invention, the lower side wall surface portion of the casing is configured so that the lower side wall portions are closed under the state where the H-shaped steel web and the flange are projected from the casing. The above-described problem is solved by providing the H-shaped slit corresponding to the outer shape of the above.

According to the spark scattering prevention box of the fifth aspect, since the H-shaped slit corresponding to the H-shaped steel is provided in the lower side wall surface portion, the state in which the H-shaped steel web and the flange protrude from the housing is maintained. it can.

Due to the closed state of the lower part of the housing, sparks are dropped into the housing while the H-shaped steel flange is being fused and welded through the opening window portion, so that the sparks come from below the housing. It is possible to surely prevent the occurrence of the situation of scattering.

Further, the housing attached to the H-section steel can be moved along the H-section steel, and the fusing/welding work at a desired position can be quickly performed.

In addition, in the invention of claim 6 according to the present invention, the left and right wall surface portions fixed to the flange of the H-shaped steel through the holding fixture are formed wider than the flange of the H-shaped steel. The above-described problems are solved by forming the opening window portions in the respective.

According to the spark scattering prevention box of the sixth aspect, the flange of the H-shaped steel or the like installed in the vertical direction can be surely melted and welded through the opening window portion.

Further, in the invention of claim 7 according to the present invention, the housing attached to the H-section steel is constituted by a pair of half-box bodies arranged so as to sandwich the H-section steel, and the pair of half-box bodies is formed by the H-section box. The problems described above have been solved by being able to join each other through the connecting tool while sandwiching the shape steel.

According to the spark scattering prevention box of the seventh aspect, the pair of half-box bodies arranged so as to sandwich the H-shaped steel are joined through the connecting tool, so that the work of attaching the housing to the H-shaped steel can be performed. Can be implemented quickly.

In addition, a space in a so-called closed state is generated inside the pair of half-boxes attached to the H-section steel. For example, during fusion cutting/welding of the flange of the H-section steel through the opening window, The sparks generated can be dropped into this closed space to reliably prevent the sparks from scattering around.

In addition, according to the invention of claim 8 of the present invention, the half box body cuts each of the left and right wall surface portions in the central longitudinal direction to form a pair of half wall surface pieces, and the half box body is formed above the pair of half wall surface pieces. A door piece having an H-shaped slit is provided, and a lower half wall surface piece having a half H-shaped slit is provided below the pair of half wall surface pieces. The above-mentioned problem was solved by the side wall piece being closed by the vertical wall piece.

According to the spark scattering prevention box of the eighth aspect, by joining the half box bodies constituted by the half wall surface piece, the door piece, the lower half wall surface piece, and the vertical wall surface piece to each other, A so-called closed space is created inside, and for example, sparks are dropped into the closed space while the H-shaped steel flange is being fused and welded through the opening window. Thus, it is possible to reliably prevent the occurrence of a situation in which sparks are scattered outside the joined half-box body.

In addition, since the pair of half boxes have a bilaterally symmetrical structure, the manufacturing cost can be reduced.

Further, in the invention of claim 9 according to the present invention, the lower part of the pair of half-walled pieces constituting the half-box body is provided with respective hanging protrusions, and the pair of half-walled pieces are provided on the flange of the H-shaped steel. In the addressed state, the hanging protrusion is fixed to the flange of the H-shaped steel through the holding fixture, thereby solving the above-mentioned problem.

According to the spark scattering prevention box of the ninth aspect, since the hanging protrusions at the lower portions of the pair of half wall surface pieces in either one of the half boxes can be fixed to the left and right flanges by the holding fixture, respectively, the H-shaped steel It is possible to quickly carry out the work of attaching/removing the housing to/from. Further, by this, the opening window portion of the housing can be quickly arranged so as to face the fusing/welding position of the flange.

Moreover, when attaching the housing to the H-shaped steel, since the half box bodies on one side are fixed by the holding fixtures, the pair of half box bodies can be integrated by the connecting tool. Can be carried out more quickly.

Further, the invention of claim 10 according to the present invention solves the above-mentioned problem by the door piece being attached to the upper part of the vertically extending wall piece that constitutes the half-box body via the hinge portion.

According to the spark scattering prevention box of the tenth aspect of the present invention, since the opening/closing door formed by the pair of door pieces can be opened toward the outside on the upper side through the hinge portion, when the web is melt-fused/welded, By simply opening one door piece via the hinge part, fusing and welding work can be performed easily.

At this time, since the other door piece is closed, the generated spark can be dropped into the housing, and the spark can be reliably prevented from scattering around.

As described above, according to the present invention, by attaching the casing to a predetermined portion of the H-shaped steel, the generated sparks are dropped into the casing to prevent the scattering of the sparks, and at the same time, the fusing/welding work of the flange at the location is performed. It is possible to safely perform the fusing and welding work of the web.

With the spark scattering prevention box according to the present invention, it is possible to reliably prevent scattering of sparks to the periphery of a building, for example, when melting and welding a web such as H-shaped steel and a flange.

That is, since the housing is provided with an opening window portion for melting and welding the flange in a state where the portion to be melted and welded such as H-section steel is completely covered by the housing, The work of fusing and welding the flange can be performed from the outside of the housing, and the sparks generated during the fusing and welding can be dropped into the housing to reliably prevent the sparks from scattering around.

Further, at the time of melting/welding of the web, the melting/welding work of the web can be easily performed by opening one of the pair of double door type door pieces. At this time, since the other door piece is closed, the generated spark can be dropped into the housing, and the spark can be reliably prevented from scattering around.

Furthermore, the hanging protrusions on either one of the half boxes of the housing are fixed to the flanges of the H-shaped steel by the holding fixture, and after the fixing by the holding fixture, the pair of half boxes are integrated by the connecting tool. Since this is possible, the work of attaching the housing to the H-section steel can be carried out quickly.

Further, the removal work of the housing can be easily and quickly carried out.

It is a perspective view which shows the attachment state to the H-shaped steel of a spark scattering prevention box. The outline of the attachment state of the spark scattering prevention box to the H-shaped steel is shown, (a) is a front view, (b) is a plan view, (c) is a side view, and (d) is a bottom view. It is a perspective view which shows the state which looked at the housing|casing which comprises a spark scattering prevention box from diagonally upward. It is a perspective view which shows the state which looked at the housing|casing which comprises a spark scattering prevention box from diagonally downward. The figure shows the shape of the casing that constitutes the spark scattering prevention box. (a) is a front view, (b) is a rear view, (c) is a plan view, (d) is a side view, and (e) is a bottom view. Is. FIG. 2 shows the configuration of a half-box on the left side (one side) of the housing, in which (a) is a perspective view seen obliquely from above and (b) is a perspective view seen obliquely from below. It is a perspective view which looked at the half box of the right side (other side) of a case, and was seen from the slanting upper part, (a) is a perspective view seen from the slanting lower part. FIG. 3A is a perspective view showing a mounting state of the housing to the H-shaped steel, in which a mounting state of a half-box body on the left side (one side) of the housing is obliquely viewed from above, and (b) is a left side of the housing ( It is the perspective view which looked at the attachment state of the half box body of (one) from diagonally downward. FIG. 2A is a perspective view showing a state in which the housing is attached to the H-shaped steel, in which (a) is a state in which the right (other) half box is joined to the left (one) half box as seen obliquely from above. , (B) is a perspective view of a state in which the right (other) half-box body of the housing is joined to the left (one) half-box body as viewed obliquely from below. FIG. 2A is a schematic view showing a state in which a flange portion of the H-section steel is melt-cut in a state where the case is attached to the H-section steel, and FIG. 7A is a perspective view of a state in which the flange starts to be cut through the opening window of the case. , (B) are perspective views showing a state in which the fusing of the flange is completed. The outline of the state in which the web portion of the H-section steel is melt-cut in the state where the casing is attached to the H-section steel is shown. (a) opens the door piece on one side (right side) of the case to start the fusion-cutting of the web. FIG. 3B is a perspective view of the state, and FIG. 3B is a perspective view of the state in which the fusing of the web is completed.

An embodiment of the present invention will be described below with reference to the drawings.

<Embodiment>
As shown in FIGS. 1 to 5, 10, and 11, the spark scattering prevention box according to the present invention is used for melting and welding H-section steel having flanges F at both ends of a central web W. To do.

Specifically, the housing 1 is configured to cover a predetermined portion of the H-section steel to be melted and welded, without any gap. The housing 1 is formed in a rectangular box shape using, for example, a lightweight and fireproof material.

Then, sparks generated when the H-section steel is melt-cut and welded by using the gas-cutting torch T or the like are retained in the housing 1 to reliably prevent the sparks from being scattered to the periphery.

In the present embodiment, the casing 1 is fixed to the flange F of H-shaped steel via the holding fixture G.

Specifically, the housing 1 opens and closes the upper portions of the left and right wall surface portions 2 and 3 in a state where the left and right wall surface portions 2 and 3 and the H-shaped steel web W and the flange F project from the housing 1. An opening/closing door 4 is provided.

Further, in the state where the web W and the flange F of the H-shaped steel are also projected from the housing 1, the lower side wall surface portion 5 is provided to close the lower portions of the left and right wall surface portions 2 and 3.

Further, it is provided with front and rear wall surface portions 6 and 7 that close the front and rear of the left and right wall surface portions 2 and 3, and has a rectangular box shape as a whole, and a so-called closed space is formed in the housing 1. ..

The open/close door 4 of the housing 1 is configured by a pair of double door-type door pieces 4A and 4B that are opened to melt and cut the H-shaped steel web W in the housing 1. One of the door pieces 4A is attached to the upper portion of the rear wall surface portion 7 of the housing 1 via the hinge portion H, and the other door piece 4B is attached to the upper portion of the front wall surface portion 6 of the housing 1. , Hinges H are attached.

That is, the pair of door-opening door pieces 4A and 4B has an H-shaped steel outer shape so as to open and close the upper side of the housing 1 in a state where the H-shaped steel web W and the flange F project from the housing 1. A corresponding H-shaped slit S is provided.

Further, the lower side wall surface portion 5 of the housing 1 corresponds to the H-shaped slit S and below the left and right wall surface portions 2 and 3 in a state where the web W and the flange F of the H-shaped steel project from the housing 1. Is provided with an H-shaped slit S corresponding to the outer shape of the H-shaped steel. As a result, the casing 1 attached to the H-section steel can be moved along the H-section steel, and the fusing/welding work at a predetermined portion of the H-section steel can be quickly performed.

A handle R, which is gripped by an operator, is provided near the H-shaped slit S of both door pieces 4A and 4B.

The left and right wall surface portions 2, 3 fixed to the flange F of the H-shaped steel through the holding fixture G are formed wider than the flange F of the H-shaped steel, and the opening window portion 8 is formed in the left and right wall surface portions 2, 3. Are provided respectively.

That is, the left and right wall portions 2 and 3 are formed wider than the flange F, and rectangular opening windows 8 that are long in the horizontal direction are provided near the upper ends of the left and right wall portions 2 and 3, respectively. The left and right flanges F of the H-section steel can be fused and welded through the opening window portion 8 by using, for example, a fusing gas torch T.

The housing 1 attached to the H-section steel is composed of a pair of half-box bodies 1A and 1B arranged so as to sandwich the H-section steel. The pair of half-box bodies 1A and 1B can be joined to each other via a connecting tool Q in a state where the H-shaped steel is sandwiched.

As a result, a so-called closed space is formed inside the pair of half-box bodies 1A and 1B attached to the H-section steel, and for example, the flange F of the H-section steel is melted and cut through the opening window portion 8. By holding the sparks generated during the operation in the housing 1, it is possible to reliably prevent the sparks from being scattered around.

As shown in FIGS. 1 to 5, 6 and 7, the half boxes 1A and 1B respectively cut the left and right wall surface portions 2 and 3 in the central longitudinal direction. The pair of left half wall surface pieces 2A, 2B are formed through the cutting portion C, and the right side pair of half wall surface pieces 3A, 3B are formed.

That is, the half wall surface pieces 2A and 3A are continuously provided on both sides of the rear wall surface portion 7 in one of the half box bodies 1A (the left side in FIG. 1) through the cutting portion C, and the center rear wall surface portion 7 and both sides are connected to each other. The semi-walled pieces 2A and 3A form a substantially U-shaped frame piece.

Further, the half wall surface pieces 2B and 3B are continuously provided on both sides of the front wall surface portion 6 in the other half box body 1B (right side in FIG. 1) through the cutting portion C, and the front wall surface portion 6 in the center and both sides are connected. The half wall surface pieces 2B and 3B form a substantially U-shaped frame piece.

As shown in FIGS. 3 and 6, a door piece 4A provided with a half H-shaped slit S is provided above the pair of half wall surface pieces 2A, 3A constituting one half box body 1A, and Below the half wall surface pieces 2A and 3A, a lower half wall surface piece 5A having a half H-shaped slit S is provided. Each side of the pair of half wall surface pieces 2A, 3A, the door piece 4A, and the lower half wall surface piece 5A is closed by a vertical wall surface piece 7A.

As shown in FIGS. 4 and 7, a door piece 4B having a half H-shaped slit S is provided above the pair of half wall surface pieces 2B and 3B forming the other half box body 1B. Below the half wall surface pieces 2B and 3B, a lower half wall surface piece 5B having a half H-shaped slit S is provided. Each side of the pair of half wall surface pieces 2B and 3B, the door piece 4B, and the lower half wall surface piece 5B is closed by a vertical wall surface piece 6A.

The slit S has, for example, as shown in FIG. 3, a U-shaped cutout groove provided on the side edge of the door piece 4A, and an anti-U-shaped cutout groove provided on the side edge of the door piece 4B. In the state where both door pieces 4A, 4B are closed, the notch grooves of both door pieces 4A, 4B are adjacent to each other to form an H-shaped slit S corresponding to the outer shape of the H-shaped steel. There is.

A half box body 1A composed of the above-mentioned half wall surface pieces 2A and 3A, the door piece 4A, the lower half wall surface piece 5A, and the vertical wall surface piece 7A in a state where the H-shaped steel is sandwiched, and the above half wall surface piece. 2B, 3B, the door piece 4B, the lower half wall surface piece 5B, and the half box body 1B constituted by the vertical wall surface piece 6A are joined.

Then, in a state where the H-shaped steel is sandwiched by the half boxes 1A and 1B, the pair of half wall surface pieces 2A and 2B are connected to each other by a connecting tool Q of, for example, a buckle type, which is provided over both sides. Further, the pair of half-wall pieces 3A, 3B are connected to each other by a connecting member Q, such as a buckle type, which is provided so as to extend over both of the half-wall pieces 3A, 3B, so that the pair of front and rear half-box bodies 1A, 1B are integrated. Thus, the casing 1 has a so-called closed space formed therein.

At this time, the lower half wall surface pieces 5A and 5B are formed by connecting a pair of half box bodies 1A and 1B to each other to form a substantially rectangular box-shaped casing 1, and thus the lower side wall closing the lower portion of the casing 1. Further, the both vertical wall surface pieces 6A and 7A close the front and back of the housing 1 by forming a substantially rectangular box-shaped housing 1 by joining a pair of half-box bodies 1A and 1B. It becomes the front and rear wall parts 6, 7.

A pair of half wall surface pieces 2A, 3A forming one half-box body 1A (left side in FIG. 1) and a pair of half wall surface pieces 2B, 3B forming one half-box body 1B are provided at their lower portions with drooping protrusions, respectively. 9 is provided, for example, in a state where the pair of half wall surface pieces 2A and 3A of one half box body 1A are respectively applied to the left and right flanges F of the H-shaped steel from the left side, for example, The hanging protrusion 9 is fixed to the flange F of the H-shaped steel through a sandwiching fixture G such as a screw-in sand type (see FIG. 8).

In the state where the pair of half wall surface pieces 2B and 3B of the other half box body 1B (right side in FIG. 1) are respectively applied to the right and left flanges F of the H-shaped steel from the right side, for example, screwing The hanging protrusion 9 may be fixed to the flange F of the H-shaped steel via a sandwiching fixture G of a sand type or the like.

The connecting tool Q is composed of a hooking lever provided at two upper and lower portions on one side and a hanging portion provided at two upper and lower portions on the other side via the cut portions C of the left and right wall portions 2 and 3. There is.

Now, the housing 1 is assembled to the H-shaped steel by joining the cut portions C of the pair of half-box bodies 1A and 1B so as to sandwich the H-shaped steel and then engaging the hooking lever with the hanging portion. ..

As described above, when attaching the housing 1 to the H-shaped steel, after the half box body 1A on one side is fixed by the holding fixture G, the pair of half box bodies 1A and 1B can be integrated by the connecting tool Q. Therefore, the mounting work of the housing 1 can be performed more quickly.

The above-mentioned one door piece 4A is attached to the upper part of the vertically extending wall surface piece 7A (rear wall surface portion 7) constituting the one half-box body 1A via the hinge portion H, and the other door piece 4A described above. 4A is attached to the upper part of the vertically extending wall surface piece 6A (front wall surface portion 6) forming the other half-box body 1B via a hinge portion H.

Below, the mounting process of the housing 1 that constitutes the spark scattering prevention box according to the present invention will be described in detail with reference to FIGS. 8 and 9.

First, as shown in FIGS. 8A and 8B, in a state where the half wall surface pieces 2A, 3A of the half box body 1A on one side are directed to the flange F of the H-shaped steel, the half wall surface pieces 2A, 2A, Each hanging protrusion 9 of 3A is fixed to the flange F via the holding fixture G.

Then, as shown in FIGS. 9A and 9B, the half-box body 1B on the other side is joined to the half-box body 1A on the one side by sandwiching the H-shaped steel, and the half boxes 1B are connected to each other by a connecting tool Q. Link. As a result, the housing 1 that forms a so-called closed space is formed inside the pair of half-box bodies 1A and 1B.

Next, the fusing process using the housing 1 that constitutes the spark scattering prevention box according to the present invention will be described in detail with reference to FIGS. 10 and 11.

First, as shown in FIGS. 10A and 10B, the flange F is melt-cut through the opening window portion 8 of the left wall surface portion 2 of the housing 1 by using, for example, a gas torch T for cutting. This operation is similarly performed on the opening window portion 8 of the right wall surface portion 3 on the opposite side of the housing 1.

Next, as shown in FIGS. 11A and 11B, the door piece 4B on the rear wall surface portion 7 side is closed, and the door piece 4A is opened upward via the hinge portion H on the front wall surface portion 6 side. Then, a part of the housing 1 is opened, and one side surface of the web W is blown by using, for example, a gas torch T for cutting.

Alternatively, the door piece 4A on the front wall surface portion 6 side is closed, and the door piece 4B is opened upward through the hinge portion H of the rear wall surface portion 7 to open a part of the housing 1 and the other side of the web W The side surface of is melted by using, for example, a gas torch T for melting.

In this way, the opening/closing door 4 alternately opens and closes the pair of door pieces 4A and 4B in the state where the H-shaped steel web W and the flange F are projected, and one side surface and the other side surface of the web W alternate. To cut into.

Depending on the thickness of the web W, there may be a case where only the fusing from one side is sufficient, and in such a case, the fusing from the other side is not performed.

Moreover, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

INDUSTRIAL APPLICABILITY The present invention is to perform various operations as a spark scattering prevention box that drops sparks generated when melting and welding H-shaped steel or the like of a building into a housing to surely prevent the sparks from scattering around. It is widely used in the field.

W... Web F... Flange G... Clamping fixture Q... Connecting tool R... Handle S... H-shaped slit H... Hinge part C... Cutting part T... Fusing gas torch 1... Housing 1A... Half box 1B... Half box Body 2... Left wall surface 2A... Half wall piece 2B... Half wall piece 3... Right wall surface 3A... Half wall piece 3B... Half wall piece 4... Open/close door 4A... Door piece 4B... Door piece 5A... Bottom wall surface 5B... Lower wall surface portion 6... Front wall surface portion 6A... Vertical wall surface piece 7... Rear wall surface portion 7A... Vertical wall surface piece 8... Opening window portion 9... Vertical projection portion

Claims (10)

A spark scattering prevention box consisting of a casing mounted so as to cover a predetermined portion of the H-shaped steel in order to prevent scattering of sparks generated when fusing and welding the H-shaped steel having flanges at both ends of the web,
The housing to be attached to the H-section steel is provided with an opening window portion for fusing and welding the flange of the H-section steel from the outside of the case. Also, in order to fuse and cut the web of the H-section steel in the case, a part of the case is provided. Spark scattering prevention box, which is equipped with an opening/closing door that opens and closes. Sparks consisting of a housing with flanges at both ends of the web and attached so as to cover a prescribed part of the H-section steel in order to prevent the scattering of sparks generated when fusing and welding the H-section steel installed vertically. It is a shatterproof box,
The housing attached to the H-section steel has an opening window portion for fusing/welding the flange of the H-section steel from the outside of the case. Further, in order to fuse/cut the web of the H-section steel in the case, an upper part of the case is provided. Spark scattering prevention box, which is equipped with an opening/closing door that opens and closes. The housing has a left and right wall surface portion fixed to the flange of the H-shaped steel through a holding fixture, and a double door opening that opens and closes the upper side of the left and right wall surface portion when the web and the flange of the H-shaped steel project from the housing. -Type pair of door pieces, a lower side wall surface part that closes the lower part of the left and right wall surface parts, and front and rear wall surface parts that closes the front and rear parts of the left and right wall surface parts in a state where the H-shaped steel web and the flange project from the housing. The spark scattering prevention box according to claim 1 or 2, further comprising: The pair of doors of the double door type has an H-shaped slit corresponding to the outer shape of the H-shaped steel so as to open and close the upper part of the housing when the H-shaped steel web and the flange are projected from the housing. The spark scattering prevention box according to claim 3. The lower wall surface portion of the housing is provided with an H-shaped slit corresponding to the outer shape of the H-shaped steel so as to close the lower portions of the left and right wall surface portions in the state where the web and the flange of the H-shaped steel project from the housing. Item 4. A spark scattering prevention box according to Item 3. The left and right wall surface portions fixed to the flange of the H-shaped steel through the holding fixture are formed wider than the flange of the H-shaped steel, and the opening window portions are respectively provided in the left and right wall surface portions. Spark scattering prevention box as described. The housing attached to the H-section steel is composed of a pair of half-boxes arranged so as to sandwich the H-section steel, and the pair of half-boxes sandwiches the H-section steel with a connecting tool interposed therebetween. The spark scattering prevention box according to any one of claims 1 to 5, which can be joined to each other. The half-box body includes a door piece having a half H-shaped slit above the pair of half wall surface pieces by cutting each of the left and right wall surface portions in the central longitudinal direction to form a pair of half wall pieces. Is provided with a lower half wall piece having a half H-shaped slit below the half wall piece, and the pair of half wall pieces, the door piece, and the lower half wall piece are laterally closed by the vertical wall piece. The spark scattering prevention box according to claim 7. Under the pair of half-wall pieces forming the half-box body, there are provided hanging protrusions respectively, and in a state where the pair of half-wall pieces are attached to the flange of the H-shaped steel, the holding fixture is interposed. The spark scattering prevention box according to claim 8, wherein the drooping protrusion is fixed to the flange of the H-shaped steel. The spark scattering prevention box according to claim 8, wherein the door piece is attached to an upper portion of a vertically extending wall piece that constitutes the half-box body via a hinge portion.

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