Expandable closing plate and method for dismantling cylindrical structures using the same

Abstract

To provide a telescopic closing plate that can dismantle tubular structures safely, in a shorter work time and inexpensively.SOLUTION: A telescopic closing plate comprises a circular steel plate 20 having an outer diameter smaller than the inner diameter of a tubular structure 100, a doughnut-shaped overhanging steel plate 10 provided on the back side of the circular steel plate 20 and having a variable outer diameter, a plurality of individual steel plates 11 configuring the doughnut-shaped overhanging steel plate 10, a guide roller 30 that guides the individual steel plate 20 to the outer peripheral side or inner peripheral side, and a cylinder 40 that moves the guide roller 30. The outer diameter of the doughnut-shaped overhanging steel plate 10 is at its largest diameter when the individual steel plate 10 is extended and developed to the outer peripheral side, while it is at its smallest diameter when the individual steel plate 11 is reduced and stored to the inner peripheral side, and the maximum diameter of the doughnut-shaped overhanging steel plate is smaller than the outer diameter of the tubular structure 100, and the smallest diameter of the doughnut-shaped overhanging steel plate is approximately the same outer diameter as the circular steel plate 20.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a telescopic closing plate and a method for disassembling a cylindrical structure using the same. More specifically, when disassembling a cylindrical structure (such as a chimney) having a refractory material (such as bricks) on its inner circumference, the present invention relates to a telescopic closing plate used to prevent the fall of the refractory material and a method for disassembling a cylindrical structure using the same.

Background Art

[0002] The disassembly of a cylindrical structure such as a chimney is more difficult than the disassembly of a general building that can be collapsed inside the plane of the occupied space. Although the occupied plane size is small, the height is high, and there are various restrictions such as the proximity of surrounding structures. Many disassembly methods have been proposed so far.

[0003] For example, when disassembling a cylindrical structure (such as a chimney) having a refractory material (such as bricks) on its inner circumference, in order to prevent the fall of the refractory material, a wire mocco using a wire mesh, a synthetic resin sheet, a fiber sheet, etc. (for example, Patent Document 1) or a flameproof sheet has been used.

[0004] However, since the wire mocco is heavy, when taking fall prevention measures manually, it takes time for curing. In addition, the flameproof sheet may be blown by strong winds and the sheet may scatter, and it takes time for curing.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] ​The present invention aims to provide an expandable closing plate and a method for dismantling a cylindrical structure using the same, which enable safe, time-saving, and cost-effective dismantling of cylindrical structures. [Means for solving the problem]

[0007] The telescopic closing plate of the present invention (hereinafter sometimes simply referred to as "closing plate") is a telescopic closing plate used to prevent the fall of fire-resistant material when dismantling a cylindrical structure having fire-resistant material on its inner circumference, and comprises a circular steel plate having an outer diameter smaller than the inner diameter of the cylindrical structure, a donut-shaped protruding steel plate provided on the back side of the circular steel plate and whose outer diameter changes, a plurality of individual steel plates constituting the donut-shaped protruding steel plate, a guide roller for guiding the individual steel plates to the outer or inner circumference, and a cylinder for moving the guide roller, wherein the outer diameter of the donut-shaped protruding steel plate is at its maximum diameter when the individual steel plates are extended and unfolded on the outer circumference side, and at its minimum diameter when the individual steel plates are retracted and stored on the inner circumference side, and the maximum diameter of the donut-shaped protruding steel plate is larger than the outer diameter of the cylindrical structure, and the minimum diameter of the donut-shaped protruding steel plate is approximately the same as the circular steel plate. [Effects of the Invention]

[0008] According to the present invention, cylindrical structures can be dismantled safely, with reduced working time and at a low cost.

[0009] In other words, the present invention has the following aspects. [1] An expandable closing plate used to prevent the fire-resistant material from falling when dismantling a cylindrical structure having fire-resistant material on its inner circumference, A circular iron plate having an outer diameter smaller than the inner diameter of the aforementioned cylindrical structure, A donut-shaped protruding iron plate is provided on the back side of the aforementioned circular iron plate, and its outer diameter varies. The aforementioned donut-shaped protruding steel plate comprises a plurality of individual steel plates, A guide roller that guides the individual steel plates to the outer or inner circumference, A cylinder for moving the guide roller, Equipped with, The outer diameter of the donut-shaped protruding steel plate is at its maximum when the individual steel plates are extended outwards, and at its minimum when the individual steel plates are reduced inwards and stored. Furthermore, the maximum diameter of the donut-shaped protruding steel plate is larger than the outer diameter of the cylindrical structure, and the minimum diameter of the donut-shaped protruding steel plate is approximately the same as the outer diameter of the circular steel plate, in a retractable closing plate. [2] The aforementioned donut-shaped protruding steel plate is an expandable closing plate composed of eight individual donut-shaped steel plates. [3] The aforementioned individual steel plates are all the same shape, and are retractable closing plates. [4] The cylinder is a retractable closing plate attached to the back side of the circular iron plate. [5] The guide roller is an extendable closing plate attached to the back surface of the circular iron plate. [6] Each individual steel plate is attached to the back side of the circular steel plate via the guide roller, and is an extendable closing plate. [7] A retractable closing plate to which a plate-shaped member and a flap plate are attached in order to close the gap between the aforementioned individual steel plate and the individual steel plate adjacent thereto. [8] The aforementioned flap plate is an extendable closing plate that opens and closes vertically. [9] A method for dismantling a cylindrical structure, which involves partially cutting a cylindrical structure having fire-resistant material on its inner circumference from the top using an expandable closing plate, A method for dismantling a cylindrical structure using the aforementioned expandable closing plate. [Brief explanation of the drawing]

[0010] [Figure 1]It is a back view showing the expansion (deployment) of the closing plate according to an embodiment of the present invention. [Figure 2] It is a front view showing the expansion (deployment) of the closing plate according to an embodiment of the present invention. [Figure 3] It is a back view showing the contraction (storage) of the closing plate according to an embodiment of the present invention. [Figure 4] It is a front view showing the contraction (storage) of the closing plate according to an embodiment of the present invention. [Figure 5] It is an elevation view showing the expansion (deployment) of the closing plate according to an embodiment of the present invention. [Figure 6] It is an elevation view showing the contraction (storage) of the closing plate according to an embodiment of the present invention. [Figure 7] It is an elevation view (partial only) showing the expansion (deployment) of the closing plate according to another embodiment of the present invention. [Figure 8] It is an elevation view showing the expansion (deployment) of the closing plate according to another embodiment of the present invention. [Figure 9] It is an elevation view showing the contraction (storage) of the closing plate according to another embodiment of the present invention. [Figure 10] It is a back view showing the expansion (deployment) of the closing plate according to another embodiment of the present invention. [Figure 11] It is a back view showing the contraction (storage) of the closing plate according to another embodiment of the present invention.

Mode for Carrying Out the Invention

[0011] <Summary> An expandable closing plate according to one aspect of the present invention is an expandable closing plate used to prevent the fall of fire-resistant material when dismantling a cylindrical structure having fire-resistant material on its inner circumference, and comprises a circular steel plate having an outer diameter smaller than the inner diameter of the cylindrical structure, a donut-shaped protruding steel plate provided on the back side of the circular steel plate and whose outer diameter changes, a plurality of individual steel plates constituting the donut-shaped protruding steel plate, a guide roller for guiding the individual steel plates to the outer or inner circumference, and a cylinder for moving the guide roller, wherein the outer diameter of the donut-shaped protruding steel plate is at its maximum diameter when the individual steel plates are extended and unfolded on the outer circumference, and at its minimum diameter when the individual steel plates are retracted and stored on the inner circumference, and the maximum diameter of the donut-shaped protruding steel plate is larger than the outer diameter of the cylindrical structure, and the minimum diameter of the donut-shaped protruding steel plate is approximately the same as that of the circular steel plate.

[0012] According to this embodiment, cylindrical structures can be dismantled safely, with reduced working time and lower costs.

[0013] <First Embodiment> Hereinafter, an extendable closing plate according to one embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

[0014] Figure 1 is a rear view showing the closing plate in its extended (unfolded) state according to an embodiment of the present invention. Figure 2 is a front view showing the closing plate in its extended (unfolded) state according to an embodiment of the present invention. Figure 3 is a rear view showing the closing plate in its retracted (stored) state according to an embodiment of the present invention. Figure 4 is a front view showing the closing plate in its retracted (stored) state according to an embodiment of the present invention. Figure 5 is an elevation view showing the closing plate in its extended (unfolded) state according to an embodiment of the present invention. Figure 6 is an elevation view showing the closing plate in its retracted (stored) state according to an embodiment of the present invention.

[0015] <Overall Structure> The telescopic closing plate 1 of this embodiment comprises a circular steel plate 20 having an outer diameter smaller than the inner diameter of the cylindrical structure 100, a donut-shaped protruding steel plate 10 provided on the back side of the circular steel plate 20 and having a variable outer diameter, a plurality of individual steel plates 11 constituting the donut-shaped protruding steel plate 10, a guide roller 30 that guides the individual steel plates 11 to the outer or inner circumference, and a cylinder 40 that moves the guide roller 30.

[0016] In this embodiment, as shown in Figure 5, the outer diameter of the donut-shaped protruding steel plate 10 is at its maximum diameter (D1) when the individual steel plates 11 are extended outwards, while as shown in Figure 6, it is at its minimum diameter (D2) when the individual steel plates 11 are retracted inwards. Furthermore, the maximum diameter (D1) of the donut-shaped protruding steel plate is larger than the outer diameter of the cylindrical structure 100, and the minimum diameter (D2) of the donut-shaped protruding steel plate is approximately the same as that of the circular steel plate 20.

[0017] <Cylindrical structure> In this embodiment, we will describe the case where the cylindrical structure 100 is a chimney. There are no particular limitations on the chimney, but examples include a frustoconical chimney.

[0018] In this embodiment, a fire-resistant material 101 is provided on the inner circumference of the cylindrical structure 100 (see Figures 5 and 6). Examples of fire-resistant materials 101 include bricks.

[0019] <Cylindrical structure> In this embodiment, as shown in Figures 2 and 4, the circular iron plate 20 is composed of two semicircular iron plates 21 and 22.

[0020] As shown in Figure 6, the outer diameter (D3) of the circular steel plate 20 is smaller than the inner diameter (d1) of the cylindrical structure 100. Here, the inner diameter (d1) of the cylindrical structure 100 refers to the inner diameter including the thickness of the fire-resistant material 101, as shown in Figure 6. The inner diameter (d1) of the cylindrical structure 100 (including the thickness of the fire-resistant material 101) refers to the inner diameter of the cylindrical structure 100 (including the thickness of the fire-resistant material 101) near the demolition site.

[0021] <Individual Iron Plates> In this embodiment, as shown in Figure 1, the individual iron plates 11 have a shape in which a ring (donut shape) is divided into eight sections (divided donut shape).

[0022] Here, a ring refers to an object shaped like a circle, particularly a region enclosed by two concentric circles.

[0023] <Protruding steel plate> As shown in Figures 1 and 3, the protruding steel plate 10 is a donut-shaped steel plate with a variable outer diameter.

[0024] The protruding steel plate 10 of this embodiment is composed of eight individual steel plates 11 in the shape of a divided donut.

[0025] As shown in Figure 5, the outer diameter of the protruding steel plate 10 reaches its maximum diameter (D1) when the individual steel plates 11 are extended and unfolded toward the outer circumference (in the direction of the arrow).

[0026] As shown in Figure 5, this maximum diameter (D1) is larger than the outer diameter (d2) of the cylindrical structure 100. Therefore, even if the fire-resistant material 101 were to fall, the fallen fire-resistant material 101 would be caught by the overhanging steel plate 10, which extends beyond the outer diameter (d2) of the cylindrical structure 100. Here, the outer diameter (d2) of the cylindrical structure 100 refers to the outer diameter of the cylindrical structure 100 at the demolition site. Since the cylindrical structure is partially cut from the top and demolished, the outer diameter of the cylindrical structure 100 may differ depending on the demolition site. Therefore, even in the case of a frustoconical chimney with a frustoconical shape whose diameter increases as demolition progresses, the outer diameter of the overhanging steel plate 10 is larger than that, thus preventing the fire-resistant material 101 from falling to the ground.

[0027] On the other hand, the outer diameter of the protruding steel plate 10 becomes the minimum diameter (D2) when the individual steel plates 11 are reduced and stored on the inner circumference side, as shown in Figure 6.

[0028] As shown in Figure 6, this minimum diameter (D2) is approximately the same as, or slightly larger than, the outer diameter (D3) of the circular steel plate 20, and smaller than the inner diameter (d1) of the cylindrical structure 100 (including the thickness of the fire-resistant material 101). Therefore, the closing plate 1 can be suspended inside the cylindrical structure 100.

[0029] As shown in Figure 3, when the individual steel plates 11 are reduced in size and stored on the inner circumference side, the individual steel plates 11 and the adjacent individual steel plates 11 appear to overlap in a planar manner (the portion enclosed by the rectangle 12 shown in Figure 3). However, in this embodiment, as shown in Figure 6, the individual steel plates 11 (right side) and the adjacent individual steel plates 11 (left side) are installed with alternatingly different heights (distance from the circular steel plate 20), so that the eight individual steel plates 11 can be stored without overlapping.

[0030] <Guide roller> The guide roller 30 guides the individual steel plates 11 either to the outer circumference (in the direction of the arrow) or to the inner circumference.

[0031] The guide roller 30 is located on the back side of the circular iron plate 20.

[0032] The guide roller 30 is provided opposite to a pair of guide rails 31.

[0033] A pair of guide rails 31 are provided in the same number as the individual steel plates 11 (eight in this case).

[0034] The guide rollers 32 shown in Figures 1 to 3 are provided to prevent the side of the closing plate 1 from hitting and getting caught on the surface of the fire-resistant material 101 when the closing plate 1 is lowered.

[0035] <Cylinder> The cylinder 40 is a means for moving the guide roller 30 along the guide rail 31 either towards the outer circumference (in the direction of the arrow) or towards the inner circumference.

[0036] In this embodiment, the cylinders 40 are provided in the same number as the individual iron plates 11 (8 in this case).

[0037] The cylinder 40 is attached to the back side of the circular iron plate 20. In Figure 2, 41 indicates the cylinder mounting hole.

[0038] Cylinder 40 is driven by a compressor or the like.

[0039] <Method for dismantling cylindrical structures> First, the retractable closing plate 1 according to this embodiment is suspended by a crane or the like and placed inside the cylindrical structure 100 having fire-resistant material 101 on its inner circumference. In this state, the closing plate 1 is lowered to the vicinity of the first demolition point of the cylindrical structure 100. The demolition point of the cylindrical structure 100 has been pre-cut around the perimeter with a burner or the like. Next, after the cylindrical structure 100 has been cut and separated, the retractable closing plate 1 is lowered to below the cut surface. Subsequently, the cylinder 40 is driven and the individual steel plates 11 are extended outwards (in the direction of the arrow) by the guide roller 30. As a result, the eight individual steel plates 11 are unfolded and the overhanging steel plate 10 reaches its maximum diameter (D1). In this state, when the cylindrical structure 100 is lowered, even if the fire-resistant material 101 falls, the fallen fire-resistant material 101 will be caught by the overhanging steel plate 10 which extends beyond the outer diameter of the cylindrical structure 100. Therefore, it is possible to prevent the fire-resistant material 101 from falling to the ground.

[0040] Once the dismantling of the cylindrical structure 100 at the first dismantling site is complete, the cylinder 40 is driven to retract the individual steel plates 11 inward using the guide rollers 30. As a result, the eight individual steel plates 11 are stored, and the protruding steel plate 10 reaches its minimum diameter (D2). In this state, the closing plate 1 is lowered to the vicinity of the second dismantling site of the cylindrical structure 100. Here, the individual steel plates 11 are extended and unfolded in the same manner as above to make the protruding steel plate 10 reach its maximum diameter (D1). In this way, the extension and contraction of the individual steel plates 11 are repeated, and the dismantling of the cylindrical structure 100 is advanced to the final dismantling site.

[0041] <Second Embodiment> In the expandable closing plate according to this embodiment, as shown in Figure 7, the individual steel plates 11 (hereinafter referred to as "upper individual steel plate 11a") and adjacent individual steel plates 11 (hereinafter referred to as "lower individual steel plate 11b") are installed with alternating heights. Therefore, when the individual steel plates 11 are extended outwards and fully opened, a gap 50 is created between the upper individual steel plate 11a and the lower individual steel plate 11b, which can lead to the problem of fire-resistant material entering through this gap 50. In this embodiment, it is preferable that this gap 50 be closed by the plate-shaped steel plate 60 and the flap plate 70 before the expandable closing plate 1 is suspended by a crane or the like.

[0042] In the second embodiment, as shown in Figures 7 to 11, the expandable closing plate has a plate-shaped steel plate 60 attached to the upper individual steel plate 11a by welding or the like along its arc shape to fill the gap 50.

[0043] However, in order to prevent the plate-shaped iron plate 60 attached to the upper individual iron plate 11a from interfering with the lower individual iron plate 11b and preventing the individual iron plate 11 from being closed when it is stored on the inner circumference side, a plate-shaped iron plate is not attached to the area where interference would occur.

[0044] In this embodiment, as shown in Figure 7, a flap plate 70 is attached to the area that interferes with the upper individual iron plate 11a (the area where the plate-shaped iron plate 60 is not attached). Since the flap plate 70 is attached using a hinge or the like as a pivot point, it can be opened and closed vertically. When the individual iron plate 11 is fully opened by unfolding it outwards, the gap 50 can be closed by lowering the flap plate 70, as shown in Figures 8 and 10. On the other hand, when the individual iron plate 11 is stored inwards and closed, the flap plate 70 can be raised upwards, as shown in Figures 9 and 11.

[0045] <Sheet-shaped metal plate> In this embodiment, the material, shape, etc., of the plate-shaped iron plate 60 are not particularly limited as long as they can close the gap 50 between the upper individual iron plate 11a and the lower individual iron plate 11b.

[0046] <Flap plate> In this embodiment, the material, shape, etc. of the flap plate 70 are not particularly limited as long as they can close the gap 50 between the upper individual steel plate 11a and the lower individual steel plate 11b.

[0047] Furthermore, the means for opening and closing the flap plate 70 is not limited to hinges or the like.

[0048] <Variation> The above describes an expandable closing plate and a method for dismantling a cylindrical structure using the same according to one embodiment. However, the present invention is not limited to this embodiment, and may be modified in the following ways, for example. Furthermore, the embodiment and the modified are combined, or modified are combined with each other. In addition, examples not described in the embodiment or modified, or design changes that do not depart from the gist of the invention are also included in the present invention.

[0049] <Iron Plate> In this embodiment, the circular iron plate 20 is composed of two semicircular iron plates 21 and 22, but it is not limited to this, and it may be composed of one circular iron plate or three or more plates.

[0050] <Protruding steel plate> The protruding steel plate 10 in this embodiment is composed of eight divided donut-shaped individual steel plates 11, but the number and shape of the individual steel plates 11 are not particularly limited.

[0051] <Cylinder> In this embodiment, the individual steel plates 11 are moved to the outer or inner periphery side via the guide rollers 30 by the cylinder 40, but it is not limited to a cylinder as long as the individual steel plates 11 can be moved.

[0052] <Cylindrical structure> In this embodiment, the case where the cylindrical structure 100 is a chimney was described as an example, but the cylindrical structure is not limited to a chimney. [Explanation of Symbols]

[0053] 1. Extendable closing plate 10 Overhanging steel plate 11 individual griddle plates 20 circular iron plates 30 Guide Rollers 40 cylinders

Claims

1. An expandable closing plate used to prevent the fire-resistant material from falling when dismantling a cylindrical structure having fire-resistant material on its inner circumference, A circular iron plate having an outer diameter smaller than the inner diameter of the aforementioned cylindrical structure, A donut-shaped protruding iron plate is provided on the back side of the aforementioned circular iron plate, and its outer diameter varies. A guide roller that guides the aforementioned donut-shaped protruding steel plate to the outer or inner circumference, A cylinder for moving the guide roller, Equipped with, The donut-shaped protruding steel plate is composed of a plurality of individual steel plates, and the outer diameter of the donut-shaped protruding steel plate is at its maximum when the individual steel plates are extended outwards, and at its minimum when the individual steel plates are contracted inwards. Furthermore, the maximum diameter of the donut-shaped protruding steel plate is larger than the outer diameter of the cylindrical structure, and the minimum diameter of the donut-shaped protruding steel plate is approximately the same as the outer diameter of the circular steel plate. A retractable closing plate characterized by the following features.

2. The aforementioned donut-shaped protruding steel plate is composed of eight individual donut-shaped steel plates. The telescopic closing plate according to claim 1.

3. All of the aforementioned individual steel plates are the same shape. The telescopic closing plate according to claim 1 or 2.

4. The cylinder is attached to the back side of the circular iron plate. The telescopic closing plate according to claim 1 or 2.

5. The guide roller is attached to the back surface of the circular iron plate. The telescopic closing plate according to claim 1 or 2.

6. Each individual iron plate is attached to the back side of the circular iron plate via the guide roller. The telescopic closing plate according to claim 5.

7. A plate-shaped member and a flap plate are attached to close the gap between one of the aforementioned individual steel plates and the adjacent individual steel plate. The telescopic closing plate according to claim 1 or 2.

8. The aforementioned flap plate opens and closes vertically. The telescopic closing plate according to claim 7.

9. A method for dismantling a cylindrical structure, which involves partially cutting a cylindrical structure having fire-resistant material on its inner circumference from the top using an expandable closing plate, A method for dismantling a cylindrical structure, characterized by using the expandable closing plate described in claim 1.

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