JP6045358B2 - Falling object protection device in the chimney - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a fallen object protection device in a chimney that is installed to protect an operator from falling objects such as peeled refractory materials when performing various operations in a cylinder of a chimney that performs gas exhaust and the like. is there.

  When performing operations such as cleaning, checking, and repairing the inside of the chimney that performs gas exhaust and the like, a working gondola that moves an operator up and down in the chimney is temporarily installed inside the chimney. The assembly work of this gondola is performed by carrying the components into the chimney from a manhole on the lower side of the chimney.

  However, the refractory material applied to the inner wall of the chimney is easy to peel off due to deterioration, and in order to protect the worker from falling objects such as peeled refractory material, work from falling objects before assembling the gondola. It is necessary to provide a device to protect the person.

  Conventionally, a metal plate formed along the horizontal cross-sectional shape of the chimney cylinder is carried into the cylinder from the flue, and the metal plate covers the upper part of the work space to protect against falling objects. However, in the case of a metal plate, it is difficult to carry in a metal sheet having a size that matches the horizontal cross-sectional shape of the cylinder and to allow the worker to adhere to the inner wall of the cylinder without working in the cylinder. Moreover, the horizontal cross-sectional shape inside the cylinder is deformed due to breakage of the refractory material or the like, and if a gap is generated between the inner wall and the metal plate due to the deformation, falling objects may pass through the gap.

  Patent Document 1 describes a protection device for work in a chimney composed of a balloon for expansion and contraction and a balloon for roof. In this protective device, first, the telescopic balloon and the roof balloon are carried into the chimney cylinder with the air removed, the air is supplied to the telescopic balloon, and the roof balloon is lifted to a predetermined height. Air is supplied to the roof balloon, and the roof balloon is inscribed in the cylinder to form the roof. Thereafter, when the air of the expansion / contraction balloon is removed and the expansion / contraction balloon is pulled up to the lower surface of the roof balloon, a space is formed below the roof balloon, and operations such as assembling a work gondola are performed in this space. Air supply to or extraction from each balloon can be performed from the outside of the cylinder, and the roof balloon presses the inner wall of the cylinder with air pressure without creating a gap between the balloon and the inner wall. Falling objects can be prevented.

Japanese Utility Model Publication No. 3-93561

  However, the roof balloon described in Patent Document 1 is cylindrical and requires a large amount of air. In addition, in Patent Document 1, since air is supplied to and extracted from the balloon for expansion and contraction, there is a problem that it takes a long time to supply air when installing the roof balloon and to extract air during removal. Also, the cylindrical balloon is extremely heavy.

  An object of the present invention is to provide a lightweight fallen object protection device that can be installed and removed in a shorter time than before.

  In order to solve the above problems, the present invention is a chimney fall object protection device that is disposed inside a chimney cylinder and receives a fall object, and expands when air is supplied into the chimney. The balloon is in close contact with the inner wall surface, and a protective sheet is attached to at least one of the upper and lower surfaces in the horizontal direction of the balloon. The balloon is inflated and has a hole in the center in the horizontal direction. It is an annular shape, and the protective sheet is attached so as to close the hole portion.

  In the falling object protective device in the chimney, the protective sheet may have a double layer structure or a multilayer structure having two or more layers. Moreover, it is preferable that the protective sheet attached to the upper side of the cylinder among the protective sheets having a multilayer structure is made of an impact absorbing material.

  According to the present invention, since the air supplied to the balloon can be reduced, the balloon that protects the operator from falling objects can be installed and removed in a short time. Further, the weight of the balloon is reduced.

It is sectional drawing which shows the outline | summary inside the chimney which installed the falling object protection apparatus in a chimney concerning embodiment of this invention. It is the cross-sectional view seen from the AA line of FIG. It is an expanded sectional view showing the example of composition of the falling object protection device in a chimney.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show the inside of a chimney 2 provided with the falling object protective device 1 in the chimney according to the present invention. The chimney 2 has a cylinder 3 that extends perpendicularly to the ground. The cylindrical body 3 has a circular cross-sectional shape in the horizontal direction and an inner diameter of, for example, about 4 to 6 m. A refractory material 4 is applied to the inner wall of the barrel 3, and a flue 5 extending substantially horizontally is formed in the middle of the barrel 3 so as to communicate with the barrel 3. Further, a manhole 6 is provided on the lower side surface of the cylindrical body 3.

  When performing operations such as cleaning the chimney and maintaining the refractory material 4, a working gondola 9 is installed in the barrel 3. The gondola 9 can move up and down in the barrel 3 with the worker 10 on it. The material constituting the gondola 9 is carried from the lower manhole 6 and assembled by the operator 10 within the barrel 3.

  In such a case, prior to assembling the gondola 9, in order to protect the worker 10 who assembles the gondola 9 from falling objects such as deteriorated refractories, the fallen object protection device 1 in the chimney is installed before assembling the gondola 9. It is installed in the cylinder 3.

  As shown in FIGS. 2 and 3, the falling object protective device 1 in the chimney according to the present embodiment is configured by a balloon 11 and a protective sheet 12 attached to the upper surface of the balloon 11. Connected to the balloon 11 are an air supply means 21 for supplying air to the balloon 11 and an exhaust means 22 for extracting air from the balloon 11. The balloon 11 is substantially flat and can be folded when the air is removed, and when the air is supplied, the balloon 11 swells into an annular shape (a donut shape) having a hole 11a at the center. Further, on the outer peripheral side when inflated, in order to attach the protective sheet 12, petets (not shown) for locking the strings are provided at appropriate intervals. As the material of the balloon 11, for example, tarpaulin is suitable, but synthetic resin, natural fiber or chemical fiber may be used as long as the injected air does not leak and is a high strength material.

  The balloon 11 is connected to the air supply means 21 and the exhaust means 22 via, for example, a tube 23 connected to the side of the balloon 11 and a switching valve 24 provided in the middle of the tube 23. The air supply means 21 is, for example, a compressor, and the exhaust means 22 is, for example, an exhaust pump. Thus, air is supplied to and extracted from the balloon 11.

  The protective sheet 12 is attached so as to cover the upper surface of the balloon 11 so as to close the hole 11 a of the balloon 11. The protective sheet 12 is fixed by tying it with a string or the like provided on the outer periphery of the balloon 11, for example. The protective sheet 12 is not limited to the upper surface of the balloon 11, but may be attached to the lower surface, or may be attached to both the upper surface and the lower surface. Further, the protective sheet 12 may be attached by joining a plurality of divided sheets.

  As shown in FIG. 3, the protective sheet 12 has a two-layer structure, and as a material, the first layer 121 located on the upper side when the balloon 11 is installed has a low resilience cushion material that absorbs the impact of falling objects, and a lower side. The second layer 122 is preferably made of an aramid fiber that has excellent tensile strength, friction resistance, and heat resistance and is not easily broken. Note that the material of the protective sheet 12 may be appropriately selected depending on the properties of the fallen object and the like, and may have a multilayer structure of three or more layers.

  When air is sufficiently supplied to the balloon 11 and the outer periphery of the balloon 11 is pressed against the inner wall of the barrel 3, the balloon 11 is brought into close contact with the inner wall of the barrel 3 due to the pressure of the air, and the fallen objects are dammed up. Protect the operator 10 etc. from falling objects. Since the balloon 11 is annular, the amount of air to be supplied is smaller than that of a conventional cylindrical balloon, and the installation time of the balloon 11 can be shortened. Moreover, the constituent material of the balloon 11 can be reduced in weight. And since the hole 11a in the center of the balloon 11 is covered with the protective sheet 12, the same protective effect as that of the solid balloon conventionally used is exhibited. Furthermore, when the balloon 11 is removed, the amount of air extracted can be smaller than before, so that the removal time can be shortened.

  In addition, even when the horizontal cross-sectional shape of the cylinder 3 is not a perfect circle, the balloon 11 may be formed so that the contour shape matches the shape of the cylinder 3 and has a hole at the center.

  Next, an example of a procedure for installing the falling object protective device 1 in the chimney of the present invention will be described.

  First, a manhole on the side surface of the flue 5 is opened as a material entrance of the falling object protection device 1 in the chimney, and a working scaffold is temporarily installed in the flue 5.

  Next, the guide rail 31 is installed from the flue 5 toward the tube body 3. The front end of the guide rail 31 is engaged with a receiving member 32 that is attached in advance to the opposite side of the flue 5 on the inner wall of the cylindrical body 3, for example. Thereafter, the pallet 33 traveling on the guide rail 31 is carried in, and the folded balloon 11 before supplying air is placed on the pallet 33. At this time, the protective sheet 12 is attached to the balloon 11 in advance. Furthermore, one end of the tube 23 is connected to the air supply port of the balloon 11, and the other end side of the tube 23 is connected to the air supply means 21 and the exhaust means 22 installed outside the flue 5 via the switching valve 24. To do.

  When the pallet 33 is carried along the guide rail 31 to a predetermined position in the barrel 3, air is supplied from the air supply means 21 to the balloon 11 through the tube 23. By supplying air, the balloon 11 expands in an annular shape, and the protective sheet 12 covers, for example, the upper surface of the balloon 11. When the outer periphery of the balloon 11 is in close contact with the inner wall of the barrel 3, the supply of air is stopped.

  After the fallen object protection apparatus 1 in the chimney is thus installed, the material constituting the working gondola 9 is carried into the barrel 3 from the lower manhole 6 to assemble the gondola 9. Since the falling object protection device 1 in the chimney is installed above the work space for assembling the gondola 9, even if the refractory material 4 or the like peels off and falls, the safety of the operator 10 who assembles the gondola 9 can be ensured.

  Since the gondola 9 is provided with a roof that catches the fallen objects, when the assembly of the gondola 9 is completed, the falling object protection device 1 in the chimney is removed. That is, the switching valve 24 is set to the exhaust side, and the air inside the balloon 11 is extracted by the exhaust means 22 through the tube 23. With the balloon 11 sufficiently deflated, the pallet 33 is moved along the guide rail 31 to the flue 5 side. To draw. Thereafter, the guide rail 31 is removed from the barrel 3 and the gondola 9 is moved up and down to clean the inside of the chimney 2 and inspect and repair the refractory material 4.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  Air was supplied to an annular balloon having an outer diameter of 4.5 m at the time of air supply and a hole diameter of 3.5 m, and air was further extracted. In the case of a conventional cylindrical balloon having the same outer diameter, it takes about 4 hours to supply and withdraw air. However, in the case of the annular balloon of the present invention, it takes about 20 minutes, which can be greatly shortened. It was. In addition, the weight of the members constituting the balloon could be reduced by about 40%.

  INDUSTRIAL APPLICABILITY The present invention can be applied as a falling object protection device in a chimney that protects an operator who works at the lower part of a cylindrical structure from falling objects.

DESCRIPTION OF SYMBOLS 1 Falling object protection apparatus in a chimney 2 Chimney 3 Cylindrical body 4 Refractory material 5 Flue 9 Gondola 10 Worker 11 Balloon 11a Hole part 12 Protection sheet 21 Air supply means 22 Exhaust means 23 Tube

Claims (3)

A device for protecting a fallen object in a chimney that is placed in a cylinder of a chimney and receives a fallen object,
The balloon is inflated by supplying air therein, and the outer periphery is in close contact with the inner wall surface of the cylinder, and the protective sheet is attached to at least one of the horizontal upper and lower surfaces of the balloon,
The balloon has an annular shape with a hole formed in the center in the horizontal direction when inflated, and the protective sheet is attached so as to close the hole. Protective device.   The apparatus for protecting a fallen object in a chimney according to claim 1, wherein the protective sheet has a multilayer structure of two or more layers.   The apparatus for protecting a fallen object in a chimney according to claim 2, wherein the protective sheet attached to the upper side of the cylindrical body among the protective sheets having a multilayer structure is made of an impact absorbing material.

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