Chimney repair method

Abstract

To provide a chimney repair method that can reduce labor required for dismantling the entire chimney while improving seismic resistance.SOLUTION: The chimney repair method comprises partially dismantling a chimney 20 for improving seismic resistance.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chimney renovation method. [Background technology]

[0002] Patent Document 1 listed below describes a chimney reinforcement method in which a reinforcing steel frame is inserted into the chimney to prevent the chimney from collapsing due to an earthquake or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-92880 Summary of the Invention [Problem to be solved by the invention]

[0004] There are chimney renovation methods that use reinforcing members to improve earthquake resistance, as in Patent Document 1, but such renovation methods require a lot of man-hours to dismantle the entire chimney.

[0005] In consideration of the above, the present invention aims to provide a chimney renovation method that can improve earthquake resistance while reducing the labor required to dismantle the entire chimney. [Means for solving the problem]

[0006] The chimney renovation method of claim 1 improves earthquake resistance by partially removing the chimney.

[0007] In the chimney repair method of claim 1, the chimney is lightened by partially removing it. This increases the IS value (reducing the horizontal force acting on the chimney during an earthquake), improving earthquake resistance. This allows for improved earthquake resistance without reinforcing the chimney.

[0008] In addition, compared to improving earthquake resistance by reducing the size of a building, this does not reduce the building area, so it has less impact on the use of the building.

[0009] A chimney repair method according to claim 2 is the chimney repair method according to claim 1, wherein the chimney is formed to protrude upward from a building, and a lining material covering the inside of the protruding portion of the chimney is removed.

[0010] In the chimney renovation method of claim 2, the protruding part protruding from the building is removed. In this way, by removing the part that is likely to be subjected to horizontal force during an earthquake, the earthquake resistance is more effectively improved than when other parts are removed.

[0011] In addition, the lining material that covers the inside of the chimney is removed. This makes it less likely for dust to scatter into the outdoor space compared to removing the chimney itself. Also, because the lining material that has become contaminated through use is removed, it is possible to prevent contaminants from leaking out of the chimney.

[0012] A chimney repair method according to claim 3 is the chimney repair method according to claim 1 or 2, which includes a step of reinforcing the chimney with a reinforcing material.

[0013] In the chimney repair method of claim 3, the chimney is partially removed and reinforced with reinforcing materials, which further improves earthquake resistance.

[0014] The chimney repair method of claim 4 is the chimney repair method of claim 2, wherein the top of the protruding portion is covered with a wind-resistant film, and a dust collection chamber is provided that is under negative pressure relative to the surroundings.

[0015] In the chimney repair method of claim 4, by covering the top of the protruding part with a wind-resistant film and providing a dust collection chamber that is under negative pressure relative to the surroundings, dust is less likely to scatter into the outdoor space.

[0016] A chimney repair method according to claim 5 is the chimney repair method according to claim 4, wherein a cleaning chamber separated from the surrounding area by a sheet material and equipped with an air shower is provided inside the wind-resistant membrane.

[0017] In the chimney repair method of claim 5, the cleaning chamber, which is separated from the surrounding area by a sheet material and equipped with an air shower, is covered with a wind-resistant membrane, which prevents the cleaning chamber from being damaged by wind. [Effects of the Invention]

[0018] According to the present invention, it is possible to reduce the number of steps required to dismantle the entire chimney while improving earthquake resistance. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a cross-sectional elevation view showing a chimney repair method according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. [Figure 3] (A) is an elevation view showing an example of a method for reinforcing a chimney in a chimney repair method according to an embodiment of the present invention, (B) is an elevation view showing another example of a method for reinforcing a chimney, and (C) is an elevation view showing yet another example of a method for reinforcing a chimney. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a chimney renovation method according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0021] Furthermore, the description of the same components and symbols in the drawings may be omitted. Note that the present invention is not limited to the following embodiments, and can be implemented by making appropriate modifications, such as omitting components, replacing them with different components, or combining one embodiment with various modified examples, within the scope of the object of the present invention.

[0022] <Chimney> 1 partially shows a chimney 20 to which a chimney renovation method according to an embodiment of the present invention is applied, and a building 10 equipped with the chimney 20. The chimney 20 is formed from the inside to the outside of the building 10, and the top of the chimney 20 is formed to protrude above the building 10.

[0023] The chimney 20 is formed by a cylindrical main body 22 made of concrete, and a lining material 24 that covers the inside of the main body 22, i.e., the inner peripheral wall of the chimney 20. The lining material 24 is formed by using firebricks, castable fireproof material, or the like, and is arranged in the main body 22 from the part inside the building 10 to the part that protrudes from the building 10.

[0024] <Chimney renovation method> In a chimney renovation method according to an embodiment of the present invention, earthquake resistance is improved by partially removing the chimney 20. Specifically, the lining material 24A that covers the inside of the portion of the main body 22 that protrudes from the building 10 is removed. The lining material 24A to be removed is shown shaded in FIG. 1.

[0025] The extent of removal of the lining material 24A is determined by calculating the Is value (structural seismic index) from the weight of the chimney 20 that will result from removing the lining material 24A. The Is value is calculated using the following formula.

[0026] Is = Eo × SD × T Eo: Basic guidelines for possessing performance SD: Shape index of each floor T: aging index

[0027] Of these, Eo is calculated based on the strength (yield strength divided by weight) of the structure and its toughness. As the weight increases, the Is value decreases, and as the weight decreases, the Is value increases. In other words, as more of the lining material 24A is removed, the Is value increases.

[0028] In this embodiment, the amount of lining material 24A to be removed (in other words, the removal location) is determined so that the Is value is at least 0.6 or more. Preferably, the amount of lining material 24A to be removed is determined so that the Is value is 0.8 or more.

[0029] The Is value may be calculated using the following formula:

[0030] Is = 0.6 × Qu / Qun Qu:Horizontal bearing capacity Qun: Required horizontal bearing capacity

[0031] (scaffold) In the chimney repair method according to an embodiment of the present invention, scaffolding 30 is constructed around the chimney 20. Various types of scaffolding can be used as the scaffolding 30, such as single-pipe scaffolding, wedge-type scaffolding, and frame scaffolding. A work platform 32 is placed on the scaffolding 30.

[0032] 2, the work floor 32 is disposed so as to surround at least the opening at the upper end of the chimney 20. An air shower 40 and a dust collector 41 are installed on the work floor 32 surrounding the opening at the upper end of the chimney 20. In addition, a staircase (not shown) is installed on the work floor 32, allowing workers to move from the roof of the building 10 to the work floor.

[0033] Workers who have worked inside the chimney 20 descend from a ladder 26 hung on the chimney 20 to the work platform 32 and move along the flow line N indicated by the arrow, passing in front of the air shower 40.

[0034] On the traffic line N, there are provided an anteroom S1, a cleaning room S2, and a changing room S3, which are separated by protective sheets 42. The protective sheets 42 that separate the anteroom S1, the cleaning room S2, and the changing room S3 are formed in the shape of a curtain, allowing workers to move back and forth along the traffic line N. An air shower 40 is provided in the cleaning room S2.

[0035] In the following description, the anteroom S1, cleaning room S2, and changing room S3 surrounded by protective sheet 42 may be collectively referred to as the security room S. In addition, although the dust collector 41 is placed outside the protective sheet 42 in FIG. 2, the protective sheet 42 can also be placed so as to surround this dust collector 41.

[0036] (sheet) As shown in Fig. 1, the scaffolding 30 is covered with a mesh sheet 50. At a portion P where the scaffolding 30 protrudes horizontally from the outer wall of the building 10, the mesh sheet 50 is rolled up inside the scaffolding 30. In addition, a fall prevention net 54 is arranged inside the mesh sheet 50 as needed.

[0037] The periphery of the work floor 32 is covered with a fireproof sheet 52. The fireproof sheet 52 covers the walls, ceiling and security room S of the space above the work floor 32, as well as the work floor 32 itself.

[0038] The fireproof sheet 52 is formed of a windproof sheet (wind-resistant film) and prevents the security room S from being blown by the wind. The space inside the fireproof sheet 52 is adjusted to a negative pressure by the dust collector 41.

[0039] (wire rope) A pier 60 is provided at the top of the chimney 20, and a wire rope 62 is hooked to it. A gondola 64 is suspended from the tip of the wire rope 62, and workers ride in this gondola to work inside the chimney 20.

[0040] (Building configuration) Inside the building 10, buffer material 70 is laid at the bottom of the chimney 20 to cushion the impact of any objects that may fall during work. Also, outside the opening 20A at the bottom of the chimney 20, a dust collector 41 and an air shower 40 are installed, and a security room S is constructed that includes an anteroom S1, a cleaning room S2, and a changing room S3, each separated by a protective sheet 42.

[0041] <Effects> In the chimney repair method according to the embodiment of the present invention, the chimney 20 is lightened by partially removing the chimney 20. This increases the Is value (reducing the horizontal force acting on the chimney during an earthquake), improving earthquake resistance. This allows the earthquake resistance to be improved without reinforcing the chimney 20.

[0042] Furthermore, compared to improving earthquake resistance by reducing the size of building 10, this does not reduce the building area, so there is less impact on the use of the building.

[0043] Furthermore, in the chimney renovation method according to the embodiment of the present invention, the protruding portion of the chimney 20 that protrudes from the building 10 is removed. In this way, by removing the portion that is likely to be subjected to horizontal forces during an earthquake, the seismic resistance is more effectively improved than when other portions are removed.

[0044] Furthermore, this chimney renovation method removes the lining material 24A, which is firebrick that covers the inside of the chimney 20. This makes it less likely for dust to scatter into the outdoor space compared to removing the main body 22. Furthermore, because the lining material 24A, which has become contaminated through use, is removed, it is also possible to prevent contaminants from leaking from the chimney 20 to the outside.

[0045] Furthermore, in the chimney repair method according to the embodiment of the present invention, the top of the protruding portion of the chimney 20 from the building 10 is covered, and a dust collection chamber (the space inside the fireproof sheet 52) ​​is provided that is under negative pressure relative to the surrounding area. This makes it difficult for dust to scatter into the outdoor space.

[0046] Furthermore, in the chimney renovation method according to the embodiment of the present invention, the security room S, which is separated from the surrounding area by the protective sheet 42 and is equipped with the air shower 40, is covered with the fireproof sheet 52. This prevents the security room S from being damaged by wind.

[0047] <Other embodiments> In the above embodiment, the lining material 24A of the protruding portion of the chimney 20 that protrudes from the building 10 is removed, but the embodiment of the present invention is not limited to this. The lining material 24 of the inner portion of the building 10 may be removed depending on the required Is value.

[0048] Furthermore, the portion of the chimney 20 that is removed is not limited to the lining material 24. For example, the protruding portion of the main body 22 that protrudes from the building 10 may be removed.

[0049] In addition to partially removing the main body 22 or the lining material 24, the chimney 20 may be reinforced with a reinforcing material. By reinforcing the chimney 20 in addition to partially removing it, earthquake resistance can be further improved.

[0050] As a method for reinforcing the chimney 20, for example, as shown in FIG. 3(A), an annular steel material 80A is wrapped around the chimney 20, and a reinforcing material 80B for preventing the chimney 20 from collapsing is placed between the steel material 80A and the building 10.

[0051] As a method for reinforcing the chimney 20, for example, as shown in FIG. 3(B), a reinforcing material 80B for preventing tipping over may be placed between the chimney 20 wrapped with carbon fiber 82A and the building 10.

[0052] Furthermore, as a method for reinforcing the chimney 20, for example, as shown in FIG. 3(C), a steel frame 84 may be inserted inside the chimney 20.

[0053] These examples are used in combination with partial removal of the chimney 20, and therefore can improve earthquake resistance compared to the case where partial removal of the chimney 20 is not performed. As such, the present invention can be implemented in various modes. [Explanation of symbols]

[0054] 10 Building 20 Chimney 24 Lining material 24A Lining material 40 Air Shower 42 Curing sheet (sheet material) 52 Fireproof sheet (windproof membrane) S2 cleaning room

Claims

1. A chimney renovation method that improves earthquake resistance by partially removing the chimney.

2. The chimney is formed to protrude upward from the building, Remove the lining material covering the inside of the protruding portion of the chimney; The chimney repair method according to claim 1.

3. Reinforcing the chimney with a reinforcing material. The chimney repair method according to claim 1 or 2.

4. The top of the protruding portion is covered with a wind-resistant film, and a dust collection chamber is provided which is under negative pressure relative to the surroundings. The chimney repair method according to claim 2.

5. A cleaning chamber separated from the surrounding area by a sheet material and equipped with an air shower is provided inside the wind-resistant membrane. The chimney repair method according to claim 4.

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