Curing sheet

Abstract

To provide a curing sheet that can easily encircle a welding place (existing piping) where sparks are emitted, and prevents sparks from being scattered out of the encircled space.SOLUTION: The present invention relates to a cylindrical curing sheet 1 that encircles a work site where sparks of welding, fusing, etc., fly, and the curing sheet comprises refractory sheets 10A, 10B obtained by dividing the cylindrical shape into a plurality in a circumferential direction, and a magnet tape 12 which is disposed at right and left ends of the refractory sheet 10A detachably from the adjacent refractory sheet 10B, wherein a semicircular recessed part 13 is provided at the right and left ends of the refractory sheet 10A, and functions as a through hole 14 that piping 2 as an object of work penetrates when the adjacent refractory sheet 10B is bonded.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a protective sheet that prevents the scattering of sparks and the like during welding, cutting, or grinding work for repairing or replacing pipes, and in particular to a protective sheet that encloses a work site, such as within a power plant, when welding existing pipes, to prevent the scattering of sparks and other particles into the surrounding area. [Background technology]

[0002] When repairing or replacing pipes, welding, cutting, or grinding can cause problems with flying sparks and other debris.

[0003] Therefore, when welding pipes or the like at construction sites, etc., items that should not be exposed to sparks are covered with protective sheets, and protective sheets are placed below the welding points to prevent sparks from flying towards passersby (Patent Document 1, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-229685 [Patent Document 2] Japanese Patent Application Publication No. 8-33984 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, Patent Document 1 describes a spark receiving portion that opens and closes like an umbrella, and that is positioned below the welding location.

[0006] Patent Document 2 describes a structure in which modified S-shaped vertical and horizontal bars are positioned near (in front of, below) the welding point, and welding spark catchers made of heat-resistant sheets are attached to these bars.

[0007] In both of the methods described in Patent Documents 1 and 2, a sheet is placed between the welding point and an object that must not be covered by sparks.

[0008] However, in reality, sparks and embers fly in all directions, and there is a problem that sparks and embers that are not caught by the protective sheet (spark catcher) may bounce off other parts and fly to things that they should not hit.

[0009] Therefore, the purpose of this invention is to prevent sparks and other particles from flying outside the cylindrical space by surrounding the welding point (existing piping) where sparks and powder are generated with a protective sheet having a cylindrical space. [Means for solving the problem]

[0010] In order to solve the above problem, the invention of claim 1 is a cylindrical protective sheet for enclosing a work site where sparks and embers are generated, such as during welding and cutting, and is characterized by comprising a fire-resistant sheet divided into multiple pieces circumferentially, and fasteners at the left and right side edges of the fire-resistant sheet for detachably fastening it to adjacent fire-resistant sheets, and semicircular recesses are provided at the left and right side edges of the fire-resistant sheet, so that when the fire-resistant sheet is fastened to an adjacent fire-resistant sheet, the combined recesses function as through holes through which the piping to be worked on passes.

[0011] According to the invention of claim 1, by matching the recesses of the two fire-resistant sheets, a cylindrical space with a through hole that passes through the existing pipe can be formed, and the existing pipe can be positioned within the space of the cylindrical protective sheet, preventing sparks and other particles generated from the welding points of the pipe from flying out of the space, and preventing sparks and other particles from flying into the surrounding area.

[0012] The invention of claim 2 is characterized in that, in the protective sheet described in claim 1, a sheet-shaped magnet is provided in the recess, and radial slits are formed in the sheet-shaped magnet to bind two adjacent fire-resistant sheets together, so that when the through hole for passing the pipe is formed, the gap between the pipe and the recess is covered by the sheet-shaped magnet.

[0013] According to the invention of claim 2, when adjacent fire-resistant sheets are bonded together to form a through hole through which a pipe can be passed in two recesses, a sheet-shaped magnet with radial slits can be attached to the surface of the pipe, eliminating the gap between the recesses and the pipe, and further preventing sparks and the like from flying out of the cylindrical space in the protective sheet. [Brief explanation of the drawings]

[0014] [Figure 1] 1 to 10 are diagrams illustrating a protective sheet according to a first embodiment, and are front views of the protective sheet forming a cylindrical space. [Figure 2] FIG. 1 is a development view of the protective sheet. [Figure 3] FIG. 10 is an enlarged front view of the state in which two recesses are joined together to form a through hole. [Figure 4] FIG. 10 is a schematic perspective view showing a state in which a pipe is positioned in a through hole. [Figure 5] Figures 5 to 10 are schematic perspective views showing the steps for assembling protective sheets to form a cylindrical space, and these figures show the state just before one fire-resistant sheet is placed in the recess of an existing pipe. [Figure 6] This shows the state in which the recessed part of the fire-resistant sheet is positioned on the pipe, following the state shown in FIG. 5. [Figure 7] This shows the state in which the fire-resistant sheet is rolled up from the state shown in Figure 6 and the other recess is positioned on the pipe. [Figure 8] This shows the state immediately before another fire-resistant sheet is attached to the existing fire-resistant sheet from the state shown in FIG. 7. [Figure 9]This shows the state in which another fire-resistant sheet is attached to the installed fire-resistant sheet from the state shown in Figure 8, and a pipe is positioned in the recess. [Figure 10] This shows the state in which the fire-resistant sheet is rolled up from the state shown in FIG. 9, with the other recess positioned over the pipe, to form a cylindrical space. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described below based on the illustrated embodiments. (Embodiment) 1 to 10 show a protective sheet 1 according to this embodiment, in which two fire-resistant sheets 10 are bonded together to form a cylindrical space 11 in which an existing pipe 2 is housed.

[0016] The protective sheet 1 is constructed by rolling up two rectangular fire-resistant sheets 10A and 10B and joining their left and right side edges together, thereby forming a cylindrical space 11 inside.

[0017] The fire-resistant sheet 10 has magnetic tape 12 attached to its left and right side edges and bottom edge, and by bonding the left and right side edges of the two fire-resistant sheets 10A and 10B to each other, a cylindrical space 11 can be formed as described above.

[0018] This cylindrical space 11 is a space sufficient for repairing, replacing, and other work on the pipe 2, and is formed to a size large enough to accommodate workers and necessary tools.

[0019] The magnetic tape 12 at the lower end of the fireproof sheet 10 is adapted to attract the magnetic tape 12 to the iron plate when the floor surface is made of iron plate, for example, and can prevent sparks generated in the cylindrical space 11 from leaking to the outside.

[0020] The fire-resistant sheet 10 may be any material that does not cause holes or fires when hit by flying sparks, and may be a ceramic sheet made of ceramic fiber, or a synthetic resin fiber sheet such as a flame-retardant or non-combustible sheet.

[0021] The fire-resistant sheet 10 is made of a material that is flexible in all directions, such as cloth.

[0022] In each figure, the fire-resistant sheet 10 appears to be plate-shaped, but this is shown this way for the sake of convenience. In reality, the sheet-like material (such as cloth) can be formed into a protective sheet 1 with a cylindrical space 11 by attaching a simple framework to the sheet-like material or by hanging it from above.

[0023] Semicircular recesses 13 are formed at predetermined positions on both the left and right edges of the fire-resistant sheet 10, and these recesses 13 are formed to be approximately the same size as half the cross-sectional diameter of the pipe 2 to be repaired.

[0024] This allows the piping 2 to be positioned within the hole (through hole 14) formed when the two recesses 13 come together when the two fire-resistant sheets 10 are joined together at their left and right side edges (see Figures 3 and 4).

[0025] In addition, the positions (heights) of the recesses 13 on both the left and right edges of the fire-resistant sheet 10 are formed higher than the height of the existing piping 2. This is to prevent a space from being formed between the bottom of the fire-resistant sheet 10 and the floor surface when the recesses 13 of the fire-resistant sheet 10 are adjusted to the height of the piping 2, and to prevent sparks generated inside the cylindrical space 11 from leaking to the outside.

[0026] A semicircular sheet magnet is placed in the recess 13, and three slits are provided radially in this sheet magnet, forming four fan-shaped magnet pieces 15.

[0027] When the pipe 2 is positioned in the through hole 14 formed by joining the left and right side edges of the two fire-resistant sheets 10, the fan-shaped magnet 15 is bent along its periphery so that it adheres to the surface of the pipe 2. This eliminates the gap between the recess 13 and the pipe 2, preventing sparks and the like from flying out of the cylindrical space 11 of the protective sheet 1 (see Figure 4).

[0028] Next, the steps for assembling the two fire-resistant sheets 10A and 10B into a cylindrical protective sheet 1 by binding the left and right side edges of the two fire-resistant sheets 10A and 10B together will be described in order.

[0029] First, the recess 13 on one side edge of the fire-resistant sheet 10A is aligned so that the pipe 2 is positioned inside it (see FIGS. 5 and 6).

[0030] Next, the fire-resistant sheet 10A is curved (rolled) so that the recess 13 on the other side edge is aligned with another portion of the piping 2 (see FIG. 7).

[0031] When positioning the pipe 2 in the recess 13, the four fan-shaped magnet pieces 15 in the recess 13 are bent outward, the pipe 2 is positioned in the recess 13, and the fan-shaped magnet pieces 15 are attracted to the outer surface of the pipe 2 (see Figure 4).

[0032] Next, the fire-resistant sheet 10B is placed on the opposite side of the pipe 2 from the fire-resistant sheet 10A, and is moved toward the pipe 2 (see FIG. 8).

[0033] Then, the recess 13 of the fire-resistant sheet 10B is aligned with one of the recesses 13 of the fire-resistant sheet 10A, and the pipe 2 is sandwiched between the two recesses 13 (see FIG. 9).

[0034] When the piping 2 is positioned within the two recesses 13 of the fire-resistant sheets 10A and 10B, the magnetic tape 12 on the side edge of the fire-resistant sheet 10B is bonded to the magnetic tape 12 on the side edge of the fire-resistant sheet 10A (see Figure 9).

[0035] By matching the recess 13 of the fire-resistant sheet 10A with the recess 13 of the fire-resistant sheet 10B, a through hole 14 through which the pipe 2 passes is formed.

[0036] Furthermore, when the pipe 2 is positioned within the recess 13 of the fire-resistant sheet 10B, the fan-shaped magnet pieces 15 of the fire-resistant sheet 10B are bent outward and are attached to the surface of the pipe 2 in the same manner as the magnet pieces 15 of the fire-resistant sheet 10A. In this way, the pipe 2 is positioned within the two recesses 13, i.e., within the through-holes 14, and by attaching the fan-shaped magnet pieces 15 to the pipe 2, it is possible to eliminate gaps between the inside and outside of that portion (the inside and outside when the cylindrical space 11 is formed), and it is possible to prevent sparks and powder from the welding work within the cylindrical space 11 from scattering outside the cylindrical space 11.

[0037] Next, the fire-resistant sheet 10B is bent to align the recess 13 on the other side edge with another part of the piping 2, and at the same time, the magnetic tape 12 on the side edge of the fire-resistant sheet 10B is bonded to the magnetic tape 12 on the side edge of the fire-resistant sheet 10A (see Figure 10).

[0038] In this way, the protective sheet 1 is assembled from the two fire-resistant sheets 10A and 10B, and a cylindrical space 11 can be formed inside which the pipe 2 is located.

[0039] In addition, similar to the bonding of one side edge of the two fire-resistant sheets 10A and 10B, the other side edge is also bonded by matching the two recesses 13 to form a through hole 14 for the pipe 2, and the fan-shaped magnet piece 15 of the recess 13 is bent so that it is outside the cylindrical space 11 and is adsorbed to the outer surface of the pipe 2.

[0040] When a worker performs work such as welding pipes 2 inside cylindrical space 11 inside protective sheet 1, he peels off magnetic tape 12 that connects fire-resistant sheet 10A and fire-resistant sheet 10B. This allows him to enter cylindrical space 11. FIG. 1 shows a state in which part of magnetic tape 12 at the bottom of protective sheet 1 has been peeled off and the bottom of fire-resistant sheet 10B has been rolled up. From this state, he can further peel off magnetic tape 12 to enter cylindrical space 11.

[0041] After entering the cylindrical space 11, the magnetic tape 12 is used to bind the fire-resistant sheets 10A and 10B together, thereby securing the cylindrical space 11 in which the required work can be performed.

[0042] Work such as welding is carried out within the cylindrical space 11 of the protective sheet 1, but sparks and embers generated when welding the repair area (welding area) of the pipe 2 fall into the cylindrical space 11 and do not fly outside the cylindrical space 11, so there is no need to worry about flying sparks, improving work efficiency.

[0043] In this way, the fire-resistant sheets 10A and 10B are bonded together with the magnetic tape 12, and once bonded together, the sealing is good, so that sparks and other sparks generated during welding do not leak from the cylindrical space 11 and do not scatter to unexpected places, allowing for safe welding work.

[0044] The size of the cylindrical space 11 depends on the size of the fire-resistant sheets 10A and 10B, and is therefore determined taking into consideration the type of work to be performed in the cylindrical space 11, particularly the size of the tools and the like that will be required.

[0045] Thus, according to this embodiment, regardless of the location of the existing piping 2, by aligning the semicircular recesses 13 of the two fire-resistant sheets 10, a protective sheet 1 having a cylindrical space 11 through which the existing piping 2 passes can be constructed.

[0046] While the embodiments of the present invention have been described above, the specific configuration is not limited to the above embodiments, and design changes within the scope of the present invention are also included. For example, while the above embodiments have described a configuration in which a single recess is formed in the height direction on the side edge of the fire-resistant sheet 10, the present invention is not limited to this configuration, and multiple recesses 13 may be formed at different heights. Such a curing sheet 1 can be used for existing pipes 2 at different positions (heights). In this case, unused recesses 13 (through holes 14) can be sealed from the inside of the cylindrical space 11 with a sealing sheet or the like to reliably prevent sparks from flying to the outside.

[0047] In short, by enclosing the welding work and the welding location in the space (cylindrical space) of the protective sheet 1, it is possible to prevent sparks and powder from being scattered around during welding.

[0048] Furthermore, in the above embodiment, two fire-resistant sheets 10A and 10B are combined to form the curing sheet 1 having the cylindrical space 11. However, the present invention also allows for the combination of multiple fire-resistant sheets 10. For example, if three fire-resistant sheets 10 are combined, a cylindrical space 11 with a larger planar area can be secured. Furthermore, the position of the pipe 2 on the planar surface within the cylindrical space 11 can be shifted away from the center, thereby providing a larger space for workers. In this case, the pipe 2 passes through two of the three through holes 14, leaving one through hole 14 unused. However, the unused through hole 14 can be simply sealed.

[0049] Furthermore, it is preferable that the size of recess 13 is half the diameter of pipe 2 in the sense that no gap is generated, but in reality, recess 13 is formed to be larger than the diameter of pipe 2, and some gap is generated when recess 13 is positioned on pipe 2. In such a case, a flange-shaped sealing sheet can be prepared to cover the gap between pipe 2 and through-hole 14 from the cylindrical space 11 side.

[0050] Furthermore, in this embodiment, the fire-resistant sheet 10 is configured as a single sheet, but it may be doubled. By doubling the fire-resistant sheet 10, different materials can be used on the inside and outside of the curing sheet 1, allowing selection of materials suited to the work site environment. Also, by doubling the fire-resistant sheet 10, it is possible to sufficiently increase fire resistance by combining relatively inexpensive fire-resistant sheets without using expensive ones.

[0051] In order to maintain a cylindrical space with the two fire-resistant sheets 10A and 10B, a framework, hanging, or the like can be used depending on the situation at the site.

[0052] For example, if there are other pipes 2 above, the two fire-resistant sheets 10A, 10B can be suspended by strings or ropes attached to the pipes. Alternatively, a framework may be built into the fire-resistant sheets 10A, 10B in advance, allowing the fire-resistant sheets 10A, 10B to stand on their own. In short, any means is acceptable as long as it can enclose the welding points and ensure a space where workers can enter and perform welding work.

[0053] In the above embodiment, magnetic tape 12 is provided as a fastener on the side edges of two fire-resistant sheets 10A and 10B, but the present invention is not limited to this, and fasteners such as hook-and-loop fasteners may also be used. The key point is that the fastener has good adhesion and can prevent sparks and embers generated within cylindrical space 11 from scattering outside cylindrical space 11. [Explanation of symbols]

[0054] 1. Protective sheet 10A fire-resistant sheet 10B Fire-resistant sheet 11 Cylindrical Space 12 Magnetic tape (binding device) 13 Recess 14 Through holes 15 Fan-shaped magnet pieces (sheet magnets) 2 Piping

Claims

1. It is a cylindrical protective sheet that surrounds work sites where sparks and powder are generated, such as welding and cutting. A fire-resistant sheet obtained by dividing the cylindrical shape into a plurality of pieces in the circumferential direction; The fire-resistant sheet is provided with a fastener at each of the left and right side edges thereof for removably fastening the adjacent fire-resistant sheet, Semicircular recesses are provided on the left and right side edges of the fire-resistant sheet, and when the fire-resistant sheet is bonded to an adjacent fire-resistant sheet, the combined recesses function as through holes through which the pipe to be worked passes. A protective sheet characterized by:

2. A sheet-shaped magnet is provided in the recess, and radial slits are formed in the sheet-shaped magnet, When two adjacent fire-resistant sheets are bonded together to form the through-hole through which the pipe passes, the gap between the pipe and the recess is covered with the sheet-like magnet. The curing sheet according to claim 1 .

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