JP6461634B2 - Chimney building unit and chimney building method - Google Patents

Description

  The present invention relates to a chimney construction technique used when a new chimney is constructed outside an existing chimney using an existing chimney or when an existing chimney is reinforced.

  Steel chimneys that form part of the blast furnace facilities at steelworks gradually deteriorate with long-term operation, so repair technology (reinforcement technology) that has been proposed for steel chimneys that have approached the limit of use has been proposed. (For example, see Patent Documents 1 and 2). The “iron chimney chimney replacement repair method” described in Patent Document 1 is a method of using a steel reinforcing material to completely reinforce the cylinder without stopping the chimney function of the existing steel chimney. The “double-cylinder reinforcement structure of steel chimney” described in Patent Document 2 is a method of partially reinforcing the cylinder body without stopping the chimney function of the existing steel chimney using a steel reinforcement material. is there.

JP 54-73426 A JP-A-62-2228572

  In the conventional methods described in Patent Documents 1 and 2, etc., an arc-shaped split steel plate divided into a plurality of halves or more is arranged at a predetermined position around an existing chimney using a lifting machine. After welding (temporary fixing), it is necessary to weld the steel plates that are adjacent to each other vertically and horizontally, so not only does it take a lot of time to lift the divided steel plates, but also requires many welding operations that use fire. It is said. Moreover, in order to construct these methods, it is necessary to construct a scaffold at the construction site. Therefore, a lot of materials and labor are required for the construction of the scaffold, which is a factor in prolonging the construction period.

  On the other hand, an attempt to reduce the number of times of lifting and lifting time of the divided steel plate by increasing the size of the divided steel plate in order to solve the problems of the conventional method has been proposed. As a result, the safety of lifting and temporary fixing operations will become a major problem, as well as new problems related to unloading, mounting, and fixing. Actually, it has not been possible to improve work efficiency and shorten the construction period.

  Therefore, the problem to be solved by the present invention is to provide a chimney construction technique that simplifies the material lifting process, reduces the use of fire, and shortens the work period.

The chimney building unit of the present invention is configured such that at least a pair of segment members having a shape obtained by vertically dividing a cylindrical body in parallel with an axis thereof and one vertically divided portion of the pair of segment members facing each other. A hinge member that is pivotably connected, and a coupling means that removably couples the other vertically divided portions of the segment member ,
The hinge member penetrates the washer member in the vertically divided direction, and a plurality of washer members fixed to the vertically divided portions of the segment members facing each other in a state of being superposed in the vertically divided direction. And a friction reducing member sandwiched between the washer members .

  With such a configuration, it is possible to perform a placement operation around the existing chimney, a temporary fixing operation, and a fixing operation with respect to the existing chimney, with the pair of segment members as one unit, thus simplifying the lifting process. And shortening the construction period. Further, by using a pair of segment members that are rotatably connected by hinge members and have detachable coupling means, the segment members can be temporarily fixed to the existing chimney without performing temporary welding. Use work can also be reduced.

As described above , the hinge member includes a plurality of washer members fixed to the vertically divided portions of the segment members facing each other so as to be superposed in the vertically divided direction, and the washer member being vertically divided. and the shaft member is a bolt and nut mechanism disposed so as to penetrate in the direction, and the friction-reducing member interposed between the washer members together, Ru Tei comprises a.

  Moreover, the penetration part for welding can be provided in the said segment member.

  Furthermore, the scaffold attachment member which has the opening part penetrated in the said dividing direction in the outer peripheral surface of the said segment member can be provided.

Next, in the chimney construction method of the present invention, the segment member constituting any one of the above-described chimney construction units is rotated with the hinge member so that the other vertically divided portion is opened. A step of disposing the segment member on the outer periphery; a step of rotating the hinge member in the reverse direction to close the other vertically divided portion and covering the outer periphery of the existing chimney with the segment member; It is characterized by comprising a step of connecting the other vertically divided portions of the segment member with the connecting means, and a step of welding the vertically divided portions in an opposed state.

  Moreover, in the said chimney construction method, the process of welding the penetration part of the said segment member which covers the outer periphery of the said existing chimney, and the outer periphery of the said existing chimney can also be provided.

  According to the present invention, it is possible to provide a chimney construction technique that simplifies the material lifting process, reduces work using fire, and shortens the work period.

It is a top view which shows the unit for chimney construction which is embodiment of this invention in the state which closed the segment member. It is a top view which shows the unit for chimney construction shown in FIG. 1 in the state which opened the segment member. FIG. 2 is a partially omitted view seen from the direction of arrow A in FIG. 1. It is the figure seen from the arrow B direction in FIG. It is an enlarged view of the part shown by the arrow C in FIG. It is an enlarged view of the part shown by the arrow D in FIG. It is a partially abbreviated figure which shows the chimney which is the construction object of the chimney construction method which is embodiment of this invention. It is a partially abbreviated figure which shows the construction condition in the part shown by the arrow E in FIG. It is a perspective view which shows a part of chimney constructed | assembled with the chimney construction method which is embodiment of this invention. It is sectional drawing in the FF line in FIG. It is a perspective view which shows a part of chimney constructed | assembled with the chimney construction method which is embodiment of this invention.

  Hereinafter, based on FIGS. 1-11, the chimney construction unit 100 which is embodiment of this invention, and the chimney construction method using the same are demonstrated.

  As shown in FIGS. 1 to 4, the chimney building unit 100 of the present embodiment includes a pair of segment members 11 and 12 having a semi-cylindrical shape obtained by vertically dividing a cylindrical body in parallel with its axis, and a pair of segments. The hinge member 30 that is pivotably connected to each other in a state where one of the vertically divided portions 11a and 12a of the members 11 and 12 are opposed to each other, and the other vertically divided portion 11b and 12b of the segment members 11 and 12 are detachable. And a connecting means 50 for connecting to. The segment members 11 and 12 each have a plurality of slit-like through portions 13 and 14 for welding.

  In addition, in this embodiment, although the slit-shaped penetration parts 13 and 14 are opened so that it may become parallel with the axial center 100c direction of the chimney construction unit 100, since it does not limit to this, it is in construction conditions. Accordingly, it can be opened in other directions (for example, a circumferential direction of the chimney building unit 100 or a direction oblique to the axis 100c).

  As shown in FIGS. 1 and 2, the chimney building unit 100 is suspended at a plurality of locations on the outer peripheral surfaces of the segment members 11 and 12 using a lifting machine (not shown) when a chimney construction is performed. A locking member (hanging piece) 16 for hooking the wire W (see FIG. 8) is fixed.

  As shown in FIG. 1, one end 15 a of the arc-shaped stopper 15 is fixed to a portion of the outer peripheral surface of the segment member 11 near the hinge member 30, and the other end 15 b of the stopper 15 is fixed to the segment member 12. Opposite the outer peripheral surface. As shown in FIG. 2, when the segment members 11, 12 open to a predetermined angle around the hinge member 30, the end 15 b of the stopper 15 comes into contact with the outer peripheral surface of the segment member 12, and the stopper 15 The segment members 11 and 12 are held so as not to be opened any more.

  As shown in FIG. 5, the hinge member 30 can be superposed on the vertically divided portions 11 a and 12 a of the opposing segment members 11 and 12 in the vertically dividing direction (in the direction of the axis 100 c of the chimney building unit 100). A plurality of washer members 31 and 32 fixed in a state, a shaft body 33 disposed so as to penetrate the washer members 31 and 32 that are alternately overlapped in the longitudinal direction (direction of the axis 100c), and the washer members 31 and 32 And a friction reducing member 34 sandwiched between them. The shaft body 33 is a bolt and nut mechanism, and is attachable to and detachable from the washer members 31 and 32 and the friction reducing member 34. The friction reducing member 34 is preferably, for example, a flat plate made of “trade name: Teflon (registered trademark)” (made of polytetrafluoroethylene), but is not limited thereto.

  Although not shown in FIG. 5, in the hinge member 30, outside the friction reducing member 34 located near the end portion of the shaft body 33 among the plurality of friction reducing members 34 (on the end side of the shaft body 33). Each of the metal plates is arranged to prevent the friction reducing member 34 from being damaged when the nut of the shaft 33, which is a bolt and nut mechanism, is tightened.

  As shown in FIG. 6, the connecting means 50 includes U-shaped connecting auxiliary members 51 and 52 arranged so as to face each other in the vertically divided portions 11 b and 12 b of the opposing segment members 11 and 12, and a connecting auxiliary member. And a bolt and nut mechanism 53 capable of tightening 51 and 52 in a direction approaching each other. The bolt and nut mechanism 53 can be attached to and detached from the connection auxiliary members 51 and 52.

  Further, as shown in FIG. 11 described later, a scaffold attachment member 70 having an opening 71 penetrating in the longitudinal direction (axial center 100c direction) is attached to the outer peripheral surfaces of the segment members 11 and 12. By inserting the hook portion 81 of the slope bracket 80 into the opening 71 of the scaffold attachment member 70, the slope bracket 80 can be detachably attached to the outer periphery of the chimney building unit 100.

  Next, based on FIGS. 7-11, the chimney construction method using the unit 100 for chimney construction (refer FIG. 1) which is embodiment of this invention is demonstrated. As shown in FIG. 7, the chimney construction method of the present embodiment is constructed as a reinforcing technique when the existing steel chimney 90 that forms part of the blast furnace equipment of the steel works is aged, but is not limited thereto. Not what you want.

  The chimney construction method of this embodiment is applied to the portion (cylinder 90x) indicated by the arrow X of the steel chimney 90 shown in FIG. As shown in FIG. 8, a wire W of a hanging jig 61 suspended from a hook 60 of a lifting machine (not shown) on a locking member (hanging piece) 16 of a chimney building unit 100 manufactured in advance on the ground. Is hooked and lifted up to near 90x. At this time, as shown in FIG. 2, the segment members 11 and 12 constituting the chimney building unit 100 rotate the hinge member 30, and the vertically divided portions 11 b and 180 b that are 180 degrees opposite to the hinge member 30. The segment members 11 and 12 are arranged on the outer periphery of the cylindrical body 90x of the steel chimney 90, which is an existing chimney, with the 12b opened.

  The suspended segment members 11 and 12 are in a state of being opened around a plurality of hinge members 30 (see FIG. 2) not shown in FIG. 8, and the segment members 11 and 12 are a plurality of segment members 11 and 12. The stopper 15 is held so as not to open more than a predetermined angle.

  Next, the hinge member 30 (see FIG. 2) is rotated in the reverse direction so that the vertically divided portions 11b and 12b of the segment members 11 and 12 are closed, and the outer periphery of the cylindrical body 90x is covered with the segment members 11 and 12. Thereafter, the vertically divided portions 11b and 12b of the segment members 11 and 12 are connected by the connecting means 50 (see FIG. 1). Thereafter, as shown in FIG. 9, the vertically divided portions 11 b and 12 b that are opposed to each other on the side where the connecting means 50 exists are welded together, and the slit-like through portions 13 and 14 are welded. In this case, as shown in FIG. 10, the welded portion 10x between the vertically divided portions 11b and 12b and the welded portions 13x and 14x of the slit-like through portions 13 and 14 are welded to the outer periphery of the cylindrical body 90x.

  In addition, when constructing a new chimney outside the existing chimney using the chimney construction unit 100 according to the present invention, it is not necessary to weld the segment members 11 and 12 to the existing chimney. It can also be set as the structure which abbreviate | omitted the slit-shaped penetration parts 13 and 14 in the members 11 and 12. FIG. In addition, when not welding the segment members 11 and 12 and the existing chimney, a backing is provided in any one of the vertically divided portions 11a and 12a (11b and 12b).

  Similarly to the above, as shown in FIG. 1, the longitudinally split portions 11a and 12a facing each other on the side where the hinge member 30 located 180 degrees opposite to the connecting means 50 is welded and slit-shaped penetrating The parts 13 and 14 are welded. In addition, although not shown in figure, when arrange | positioning the several chimney construction unit 100 along the longitudinal direction of the existing chimney, one of the segment members 11 and 12 of the several adjacent chimney construction units 100 is used. The upper edge portion and the lower edge portions of the other segment members 11 and 12 are joined by welding.

  Thereafter, the hinge member 30, the connecting means 50, the stopper 15, the locking member 16 and the like are removed from the outer peripheral surface of the segment members 11 and 12 by a method such as fusing, and the vertically divided portion 11b of the portion 50x where the connecting means 50 is located. , 12b and the part (not shown) where the hinge member 30 is located are welded to the vertically divided portions 11a, 12a, the reinforcement work for the cylindrical body 90x is completed.

  In addition, since it is not limited to the welding procedure mentioned above, for example, welding of the vertically divided portions 11b, 12b, 11a, 12a is performed in a state where the hinge member 30, the connecting means 50, the stopper 15, the locking member 16, and the like are present. It is also possible to remove the hinge member 30, the connecting means 50, the stopper 15, the locking member 16 and the like after the completion of welding.

  As shown in FIG. 11, in the chimney building unit 100, a scaffold attachment member 70 having an opening 71 penetrating in the longitudinal direction (axial center 100 c direction) is attached to the outer peripheral surfaces of the segment members 11 and 12. Yes. Therefore, when the hook portion 81 of the slope bracket 80 is inserted into the opening 71 of the scaffold attachment member 70, the slope bracket 80 is attached to the outer periphery of the chimney construction unit 100, and a scaffold (not shown) is constructed thereon. can do.

  In the chimney building unit 100 of the present embodiment, the two segment members 11 and 12 (divided steel plates) are connected to each other through a hinge member 30 so as to be freely opened and closed, thereby providing a reinforcing panel body that can be easily temporarily fixed. Therefore, it was possible to increase the size of split steel plates that could not be constructed. Further, by increasing the size of the segment members 11 and 12, the number of times of lifting and the lifting time can be significantly shortened.

  In addition, since the size of the segment members 11 and 12 can be reduced, the number of welded portions between the segment members 11 and 12 can be reduced, so that the construction period can be shortened, the work using high-temperature fire can be reduced, and the cost can be reduced. The provision of the connecting means 50 for the segment members 11 and 12 eliminates the need for conventional temporary fixing by welding, which is effective for shortening the construction period, reducing the use of high temperature fire, and reducing costs.

  Further, by attaching the scaffold mounting member 70 to the outer periphery of the segment members 11 and 12, it is possible to use the slope bracket 80 with a small number of members and good workability from a single pipe scaffold having a large construction load. Simplification of dismantling work and shortening of construction period can be realized.

  In addition, although the chimney construction method of this embodiment has demonstrated the construction example which reinforces the cylindrical body 90x of the existing steel chimney 90, since the chimney construction method of this invention is not limited to the said construction example. Further, the present invention can also be suitably carried out in a construction in which a new chimney is constructed outside the existing chimney using the existing chimney.

  The chimney building unit 100 described based on FIGS. 1 to 11 and the chimney building method using the same are examples of the present invention, and the chimney building unit and the chimney building method of the present invention are described above. The chimney building unit 100 and the chimney building method using the same are not limited.

  The chimney construction technique of the present invention can be widely used in various manufacturing industries as a chimney construction technique that constitutes a part of various production facilities such as a blast furnace in a steel mill.

10x, 13x, 14x Welded part 11, 12 Segment member 11a, 12a, 11b, 12b Vertically divided part 13, 14 Slit-like through part 15 Stopper 15a, 15b End part 30 Hinge member 31, 32 Washer member 33 Shaft body 34 Friction reduction Member 50 Connection means 51, 52 Connection auxiliary member 53 Bolt nut mechanism 60 Hook 61 Hanging jig 70 Scaffolding attachment member 71 Opening 80 Slope bracket 81 Hook part 90 Steel chimney 90x Cylindrical body

Claims (5)

At least a pair of segment members having a shape in which the cylindrical body is vertically divided in parallel with the axis thereof, and a hinge member that is rotatably connected to each other in a state in which one of the vertically divided portions of the pair of segment members faces each other. Connecting means for detachably connecting the other vertically divided portions of the segment member ,
The hinge member penetrates the washer member in the vertically divided direction, and a plurality of washer members fixed to the vertically divided portions of the segment members facing each other in a state of being superposed in the vertically divided direction. A chimney building unit comprising: a shaft body which is a bolt and nut mechanism disposed on the friction member; and a friction reducing member sandwiched between the washer members . Chimney construction for unit of claim 1 Symbol placement provided a through portion to said segment member. The chimney building unit according to claim 1 or 2 , wherein a scaffold mounting member having an opening penetrating in the longitudinal direction is provided on an outer peripheral surface of the segment member. The segment member constituting the chimney building unit according to any one of claims 1 to 3 , wherein the hinge member is rotated to open the other vertically divided portion, and the segment member is disposed on an outer periphery of an existing chimney. Disposing the segment member in a reverse direction and rotating the hinge member in a state where the other vertically divided portion is closed to cover the outer periphery of the existing chimney with the segment member, and the segment member A chimney construction method comprising: a step of connecting the other vertically divided portions with the connecting means; and a step of welding the vertically divided portions in an opposing state. The chimney construction method according to claim 4 , further comprising a step of welding a penetration portion for welding of the segment member covering the outer periphery of the existing chimney and the outer periphery of the existing chimney.

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