JP5723932B2 - How to build a scaffold in a boiler - Google Patents

Description

  The present invention relates to a method for constructing a scaffold in a boiler, and more particularly to a method for constructing a scaffold in a boiler that can shorten the construction period of a scaffold in a boiler constructed in a boiler body for boiler maintenance and inspection.

  For example, maintenance and inspection of a furnace wall of a large boiler and a burner grate installed in a thermal power plant are performed by building a scaffold in the boiler body.

  An example of a method for constructing a boiler internal scaffold is disclosed in Patent Document 1. Hereinafter, the construction method of the scaffold in the boiler is referred to as a conventional scaffold construction method 1 and will be described with reference to the drawings.

  FIG. 13 is a schematic perspective view showing a boiler internal scaffold constructed in the boiler body by the conventional scaffold construction method 1, and FIGS. 14A to 14H are process diagrams showing the conventional scaffold construction method 1. (A) is a diagram showing the construction of the uppermost scaffolding, (B) is a diagram of connecting the support pillars of the uppermost scaffolding and the lifting member of the jack body, and (C) is a lifting of the lifting member of the jack body. Fig. 3D shows the top scaffold raised, Fig. 2D shows another scaffold connected to the top scaffold, and a scaffold one step below the top scaffold. Fig. E shows the top scaffold. FIG. 5F is a diagram in which the connection between the scaffolding column and the lifting / lowering member of the jack body is released, and FIG. 5F is a diagram in which the lifting / lowering member of the jack body is lowered to the base position and coupled to the uppermost scaffolding column. The figure which raised the raising / lowering member of the jack main body, and raised the uppermost scaffold and the lower one scaffold, ( ) Is a diagram obtained by connecting a further strut to the scaffold posts in a one level lower. FIG. 14 is an enlarged view of a portion X in FIG.

  In FIG. 13, reference numeral 21 denotes a boiler inner scaffold, which is arranged on the lower work floor 24 built in the boiler hopper 23 at the bottom of the boiler body 22 in a multi-step manner with intervals along the height direction of the boiler body 22. is set up. A handrail 25 is attached to each scaffold 21, and the upper and lower scaffolds 21 are connected to each other by struts 26, and a worker can freely move between the upper and lower scaffolds 21 by means of stairs 27. Yes.

  In order to construct the boiler internal scaffold 21 by the conventional scaffold construction method 1, first, as shown in FIG. 14A, the uppermost scaffold 21a is constructed together with the support 26a on the lower work floor 24 constructed in the boiler hopper 23. To do. On the work floor 24, a jack main body 28 having an elevating member 29 is installed for each column 26a, and the elevating members 29 of all the jack main bodies 28 are moved up and down at the same time.

  Next, as shown in FIG. 5B, the support 26a of the uppermost scaffold 21a and the elevating member 29 are connected by a connecting member 30. Next, as shown in FIG. 3C, the elevating member 29 is raised to raise the uppermost scaffold 21a together with the support 26a. Next, as shown in FIG. 4D, another strut 26b is connected to the strut 26a of the raised uppermost scaffold 21a, and another scaffold 21b is constructed below the uppermost scaffold 21a. Next, as shown in FIG. 5E, the connection between the support 26a of the uppermost scaffold 21a and the elevating member 29 is released. Next, as shown in FIG. 5F, after the elevating member 29 is lowered to the original position, the support 26a of the uppermost scaffold 21a and the elevating member 29 are connected by the connecting member 30. Next, as shown in FIG. 5G, the elevating member 29 is raised again to raise the scaffold 21a and the scaffold 21b together with the columns 26a and 26b. Next, as shown in FIG. 6H, another support 26c is connected to the support 26b of the scaffold 21b, and another scaffold 21c is constructed below the scaffold 21b.

  Hereinafter, the boiler internal scaffold 21 can be constructed in multiple stages in the boiler body 22 by repeatedly performing the above steps.

  According to the above-described conventional scaffold construction method 1, it is possible to reliably construct the scaffold in the boiler, but since it is necessary to install the scaffold 21 in multiple stages, there is a problem that it takes a long construction period to construct the scaffold in the boiler. there were.

  For the purpose of shortening the construction period of the boiler internal scaffold, there is a scaffold construction method in which the boiler internal scaffold is suspended in a boiler body so as to be lifted and lowered by a jack device (see Patent Document 2). The jack device is composed of a strand whose upper end is fixed to a boiler steel frame at the top of the boiler body, suspended from the boiler body, and a jack body that raises and lowers the scaffold intermittently along the strand. Hereinafter, this scaffold construction method is referred to as conventional scaffold construction method 2.

  According to the conventional scaffold construction method 2, since it is not necessary to install scaffolds in upper and lower stages, the work period of the scaffold in the boiler can be shortened, but depending on the boiler structure, the strand can be suspended from the top of the boiler body. There may not be. For example, it is a case where the boiler water pipe is overhanging and arranged in the upper part in a boiler body (refer to Drawing 1).

  Further, as shown in FIG. 15, a water tube nose portion 31 may be formed to protrude into the boiler body 22 at the upper part in the boiler body 22. If the water tube nose portion 31 is formed, the scaffold 21 can be constructed only up to just below the water tube nose portion 31 in the above-described conventional scaffold construction method 1.

  Accordingly, the maintenance inspection scaffold such as the superheater 32 installed in the boiler body 22 above the water pipe nose 31 is formed on the lower work floor 24 by the conventional scaffold construction method 1, for example, as shown in FIG. The lower scaffold 33 is constructed up to just below the water pipe nose portion 31, the intermediate work floor 34 is constructed on the lower scaffold 33, and the upper scaffold 35 is constructed on the intermediate work floor 34.

  However, in this method, after the lower work floor 24 is constructed, the upper scaffold 35 can be constructed only after the intermediate work floor 34 is constructed. Therefore, it takes a long period of time to construct the scaffold in the boiler. .

  Therefore, Patent Document 3 discloses an example of another method for constructing a boiler internal scaffold, which has been made to solve this problem. Hereinafter, the construction method of the scaffold in the boiler is referred to as a conventional scaffold construction method 3 and will be described with reference to the drawings.

  FIG. 16: is a schematic sectional drawing which shows the boiler main body by which the upper scaffold was constructed | assembled by the conventional scaffold construction method 3. FIG.

  In FIG. 16, 36 is a horizontal beam. The horizontal beam 36 is constructed outside the boiler body 22, and is configured to be able to project into the boiler body 22 from an opening 22 a formed on the side wall of the boiler body 22. An upper scaffold 35 is constructed on the horizontal beam 36.

  In order to construct the upper scaffold 35 by the conventional scaffold construction method 3, the horizontal beam 36 is constructed outside the boiler body 22, and then the horizontal beam 36 is installed in the boiler body 22 from the opening 22 a formed in the side wall of the boiler body 22. And the upper scaffold 35 is constructed on the horizontal beam 36.

Japanese Examined Patent Publication No. 63-122863 JP 2012-52305 A JP 2011-80668 A Japanese Patent No. 2828430

  According to the conventional scaffold construction method 3, since the construction work of the upper scaffold 35 can be performed without constructing a scaffold at a level below the intermediate work floor 34, the construction period of the upper scaffold 35 can be shortened. Regarding the construction period of the entire scaffold, there were the following problems.

  While the upper scaffold 35 is being constructed on the horizontal beam 36 by the conventional scaffold construction method 3, there is a risk that tools, construction members, etc. may fall, so the construction of the upper scaffold 35 is independent of other operations. Although it can be done, in reality, while the upper scaffold 35 is being constructed, the construction of the lower scaffold 33 and the maintenance and inspection work for the boiler using the lower scaffold 33 cannot be performed.

  It has also been proposed that the intermediate work floor 34 is horizontally projected into the boiler body 22 and a scaffold plate is installed thereon as in the conventional scaffold construction method 3, but in this case as well, While the work floor 34 is being constructed, work below the intermediate work floor 34 cannot be performed, and therefore the construction period of the entire boiler scaffolding is not shortened. In addition, the construction work of the intermediate work floor 34 or the horizontal beam 36 is a work at a high place on a beam that has nothing below, so that the work efficiency is higher than that when assembled on the entire floor such as the lower work floor 24. It is greatly reduced, and it takes days to assemble. Furthermore, since it is necessary to provide a plurality of openings 22a for extending the horizontal beam 36 and a device for extending the horizontal beam 36 on the pressure-resistant portion of the boiler and the furnace wall in the vicinity thereof, particularly in the case of an existing boiler, modification of the equipment Takes time and effort.

  Accordingly, an object of the present invention is to suspend a strand from the opening formed in the side wall of the boiler body into the boiler body even when the strand cannot hang from the top of the boiler body into the boiler body due to the structure of the boiler. Thus, the suspended lifting scaffold can be reliably constructed in the boiler body. The object is to provide a method for constructing a scaffold in a boiler.

  Another object of the present invention is to easily and safely simultaneously construct a lower scaffold below the water pipe nose and an upper scaffold just below the water pipe nose in the boiler in which the water pipe nose is formed. It is in providing the construction method of the scaffold in a boiler which can shorten the construction period as the whole scaffold in a boiler by enabling it to perform.

  The present invention has been made to achieve the above object, and is characterized by the following.

Invention of Claim 1 is a construction method of a boiler internal scaffold that constructs a boiler internal scaffold in the boiler main body of the boiler, and constructs a lower work floor on a boiler hopper constructed at the lower part of the boiler main body, Next, a suspended lifting platform is constructed on the lower working floor, and then the suspended lifting platform is fixed to the strand suspended in the boiler body from the opening of the upper side wall of the boiler body, and thus the strand In the method for constructing a scaffold in the boiler, the suspension type lifting scaffold can be intermittently lifted or lowered by a jack body installed outside the boiler body to intermittently lift and lower the suspension type lifting scaffold. Lifted by the jack body to just below the water tube nose of the boiler body, and then between the lower working floor and the suspended lifting platform It constructs a lower scaffold, simultaneously with the construction of the lower scaffold, and has a particular feature to build an upper scaffold on the hanging lifting scaffold.

The invention according to claim 2 is the invention according to claim 1, wherein at least one of the lower scaffold and the upper scaffold is a mast with a rack, a pinion that meshes with the rack, and a driving means that rotates the pinion. It has the characteristic in constructing | assembling by the raising / lowering apparatus which consists of.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, after the construction of the lower scaffold is completed, the lower scaffold and the suspended lifting scaffold are connected. .

The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, a winding device for the strand is provided .

  According to this invention, the strand is suspended from the top of the boiler body due to the structure of the boiler by suspending the strand that suspends the suspension type lifting scaffold from the opening formed in the side wall of the boiler body into the boiler body. Even if it is not possible, the suspension type lifting scaffold can be reliably constructed in the boiler body, so the construction period of the boiler scaffold can be shortened.

  In addition, according to the present invention, a suspended lifting platform is constructed on the lower working floor, the suspended lifting platform is raised to just below the water tube nose part, and thereafter, the lower scaffold is constructed on the lower working floor, By constructing the upper scaffold on the suspension type lifting scaffold, the scaffold in the boiler can be constructed safely, and the construction period can be greatly shortened.

It is sectional drawing which shows the suspension type raising / lowering scaffold constructed | assembled in the boiler main body by this invention. It is the sectional view on the AA line of FIG. It is the B section enlarged view of FIG. It is an enlarged view which shows a jack main body. It is sectional drawing which shows the lower scaffold constructed | assembled in the boiler main body by this invention, and an upper scaffold. It is sectional drawing which shows the lower work floor constructed | assembled in the boiler hopper. It is sectional drawing which shows the jack main body and strand which were installed in the boiler main body. It is sectional drawing which shows the hanging type lifting scaffold fixed to the strand. It is sectional drawing which shows the suspension type raising / lowering scaffold raised to the just under water pipe nose part with the jack main body. It is sectional drawing which shows the lower scaffold currently constructed | assembled on a lower work floor, and the upper scaffold currently constructed | assembled on a suspension type raising / lowering scaffold. It is an enlarged view which shows the lower part of a lower scaffold. It is an enlarged view which shows an upper scaffold. It is a schematic perspective view which shows the boiler internal scaffold constructed | assembled in the boiler main body by the conventional scaffold construction method 1. It is the figure which constructed | assembled the uppermost scaffold among the process drawings which show the conventional scaffold construction method 1. FIG. It is the figure which connected the support | pillar of the uppermost step scaffold and the raising / lowering member of the jack main body among the process drawings which show the conventional scaffold construction method 1. It is the figure which raised the raising / lowering member of the jack main body among the process drawings which show the conventional scaffold construction method 1, and raised the uppermost scaffold. In the process diagram showing the conventional scaffold construction method 1, it is a diagram in which another strut is connected to the strut of the uppermost scaffold to construct a scaffold one step lower than the uppermost scaffold. It is the figure which canceled the connection with the support | pillar of the uppermost step scaffold, and the raising / lowering member of a jack main body among the process drawings which show the conventional scaffold construction method 1. It is the figure which lowered | hung the raising / lowering member of the jack main body to the base position among the process drawings which show the conventional scaffold construction method 1, and connected with the support | pillar of the uppermost scaffold. It is the figure which raised the raising / lowering member of the jack main body among the process drawings which show the conventional scaffold construction method 1, and raised the uppermost stage scaffold and the lower stage scaffold. It is the figure which connected another support | pillar to the support | pillar of the lower step among process drawings which show the conventional scaffold construction method 1. FIG. It is sectional drawing which shows the boiler main body in which the water pipe nose part was formed. It is a schematic sectional drawing which shows the boiler main body by which the upper scaffold was constructed | assembled by the conventional scaffold construction method 3.

  An embodiment of a method for constructing a boiler internal scaffold according to the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a suspended lifting scaffold as a scaffold in a boiler constructed in the boiler body according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is an enlarged view showing a jack body.

  1 to 4, 1 is a boiler main body, 2 is a suspension type lifting scaffold as a boiler internal scaffold, which is installed in the boiler main body 1 so as to be movable up and down by a jack device described later, and 3 is a suspension A jack device 4 for raising and lowering the lift type lifting scaffold 2 is a boiler water pipe that projects from the upper part of the boiler body 1.

  The jack device 3 includes a jack body 6 (see FIG. 4) installed outside an opening 5 formed on the upper side wall of the boiler body 1 and a strand 7 that is intermittently pulled up or down by the jack body 6. Yes. The strand 7 is guided substantially vertically by a plurality of guide rollers 8 provided in the opening 5 portion from the jack body 6 slightly inclined inward, and is suspended in the jack body 6, and the lower end is suspended from the lifting type lifting scaffold 2. It is fixed to.

  Since the strand 7 is wound or unwound by a winding device (not shown) installed outside the boiler body 1, the strand 7 can be wound even if the installation space of the jack device 3 is limited. Alternatively, rewinding can be performed easily.

  In this way, by dropping the strand 7 from the opening 5 of the boiler body 1 into the jack body 6 via the guide roller 8, for example, the boiler water pipe 4 extends over the upper portion of the boiler body 1, thereby Even when the strand 7 cannot be suspended from the top of the boiler body 1, the suspended lifting scaffold 2 can be reliably suspended by the strand 7.

  As the jack apparatus 3, for example, a center hole type jack apparatus disclosed in Patent Document 4 is used. The outline of this jack apparatus is as follows.

  A pair of grips capable of gripping and releasing a strand from which a heavy object is suspended are provided. After the strand is gripped by one grip, one grip is lifted by a jack to lift the heavy object by one stroke of the jack. Next, after the strand is gripped by the other grip, the grip of one grip is released. Then, the other grip is lifted by the jack, and the heavy object is lifted by one stroke of the jack. This operation is repeated to lift the heavy object intermittently. When suspending heavy objects, reverse this operation.

  In order to construct the suspension type lifting scaffold 2 as a scaffold in the boiler according to the present invention, first, the lower work floor 10 is constructed on the boiler hopper 9 constructed at the lower part of the boiler body 1 (see FIG. 6).

  Next, the suspended lifting scaffold 2 is constructed on the lower work floor 10 (see FIG. 8).

  Next, the jack body 6 is installed outside the opening 5 on the upper side wall of the boiler body 1, and the suspended lifting scaffold 2 is fixed to the strand 7 that is suspended in the boiler body 1 through the jack body 6.

  Thus, the strand 7 is intermittently lifted or pulled down by the jack body 6 so that the hanging type lifting scaffold 2 can be lifted and lowered intermittently.

  In this way, by dropping the strand 7 from the opening 5 of the boiler body 1 into the jack body 6 via the guide roller 8, for example, the boiler water pipe 4 extends over the upper portion of the boiler body 1, thereby Even when the strand 7 cannot be suspended from the top of the boiler body 1, the suspended lifting scaffold 2 can be reliably constructed.

  In addition, since the large boiler has a strong explosion-proof backstay, if the jack body 6 is installed on this backstay, the reaction force can be easily received.

  Next, in the boiler in which the water tube nose part is formed, it is possible to easily and safely perform simultaneous construction of the lower scaffold below the water pipe nose part and the upper scaffold directly below the water pipe nose part. The construction method of the boiler internal scaffolding which can shorten the construction period of the boiler internal scaffolding will be described with reference to FIGS.

  5 to 12, 11 is a water pipe nose portion formed on the upper portion of the boiler body 1 and protruding from the inside of the boiler body 1, 12 is a lower scaffold constructed on the lower work floor 10, This is an upper scaffold constructed on the suspended lift platform 2.

  The lower scaffold 12 is composed of a lower scaffold body 14 and lifting means 15. The elevating means 15 includes a mast 16 with a plurality of racks (not shown) installed on the lower work floor 10, a pinion (not shown) meshing with the rack, and a driving means 17 (FIG. 11) for rotating the pinion. Reference). The lower scaffold body 14 moves up and down along the mast 16 by rotating the pinion by the driving means 17.

  Next, the simultaneous construction method of the lower scaffold and the upper scaffold as the boiler internal scaffold according to the present invention will be described.

  First, as shown in FIG. 6, a lower work floor 10 is constructed on the top of the boiler hopper 9.

  Next, as shown in FIG. 7, after the jack device 3 is installed, the suspended lifting scaffold 2 is constructed on the lower work floor 10 as shown in FIG. 8. That is, the jack body 6 is installed outside the opening 5 of the boiler body 1, and the strand 7 is inserted into the jack body 6. Note that the construction order of the jack device 3 and the suspended lifting platform 2 may be reversed or simultaneous.

  Next, as shown in FIG. 9, the strand 7 is pulled up by the jack body 6, and the suspended lifting scaffold 2 is lifted up to just below the water tube nose portion 11.

  Next, as shown in FIG. 10, the mast 16 with a rack is installed on the lower work floor 10, and the lower scaffold body 12 is assembled to the mast 16 by attaching the driving means 17 and the lower scaffold body 14. Then, the lower scaffold body 14 is raised while the mast 16 is sequentially added. By repeating this operation, the lower scaffold 12 is constructed in the boiler body 1 between the suspended lifting scaffold 2 and the lower work floor 10 (see FIG. 5).

  Then, simultaneously with the construction of the lower scaffold 12, the upper scaffold 13 is constructed on the hanging type lifting scaffold 2. As shown in FIG. 12, the upper scaffold 13 may be a single pipe scaffold constructed by assembling single pipes, or may be a scaffold similar to the lower scaffold 12 described above.

  In addition, if the suspension type lifting scaffold 2 and the mast 16 of the lower scaffold 12 are connected after the construction of the suspension type lifting scaffold 2 and the lower scaffolding 12 is completed (see FIG. 5), their rigidity is dramatically improved. So safety and earthquake resistance are improved. Furthermore, since the strength of each other's work floor can be complemented, the number of members can be minimized accordingly.

  As described above, according to the present invention, the strand 7 that suspends the hanging type lifting scaffold 2 is suspended from the opening 5 formed in the side wall of the boiler body 1 into the boiler main body 1. Even when the strand 7 cannot be suspended from the top of the boiler body 1, the suspension type lifting scaffold 2 can be reliably constructed in the boiler body 1, so that the construction period of the boiler scaffold is shortened. Can do.

  In addition, according to the present invention, the suspension type lifting scaffold 2 is constructed on the lower work floor 10, and the suspension type lifting scaffold 2 is lifted to a position directly below the water pipe nose portion 11. By constructing the upper scaffold 13 on the suspension type lifting scaffold 2 at the same time as constructing the scaffold 12, the scaffold in the boiler can be constructed safely, and the construction period can be greatly shortened.

1: Boiler body 2: Suspended lifting scaffold 3: Jack device 4: Boiler water pipe 5: Opening 6: Jack body 7: Strand 8: Guide roller 9: Boiler hopper 10: Lower work floor 11: Water pipe nose part 12: Lower scaffold 13: Upper scaffolding 14: Lower scaffolding body 15: Lifting means 16: Mast 17: Driving means 21: Boiler scaffolding 22: Boiler body 23: Boiler hopper 24: Lower work floor 25: Handrail 26: Prop 27: Stair 28: Jack body 29: Lifting member 30: Connecting member 31: Water pipe nose part 32: Superheater 33: Lower scaffold 34: Intermediate work floor 35: Upper scaffold 36: Horizontal beam

Claims (4)

It is a construction method of a boiler internal scaffolding that builds a boiler internal scaffolding in the boiler body of the boiler, and constructs a lower working floor on a boiler hopper constructed at the lower part of the boiler body, and then hangs on the lower working floor A jack in which the suspended lifting platform is fixed to a strand suspended in the boiler body from the opening of the upper side wall of the boiler body, and thus the strand is installed outside the boiler body. In the construction method of the scaffold in the boiler, which can be lifted or lowered intermittently by the main body to enable the suspension type lifting scaffold to be lifted intermittently ,
The suspended lifting platform is lifted by the jack body to directly below the water tube nose of the boiler body, and then a lower scaffold is constructed between the lower work floor and the suspended lifting platform, A method for constructing a scaffold in a boiler, characterized in that, simultaneously with construction, an upper scaffold is constructed on the suspended lifting scaffold . The at least one of the lower scaffold and the upper scaffold is constructed by a lifting device including a mast with a rack, a pinion that meshes with the rack, and a driving unit that rotates the pinion. The construction method of the scaffold in the boiler. The method for constructing a scaffold in a boiler according to claim 1 or 2 , wherein after the construction of the lower scaffold is completed, the lower scaffold and the suspended lifting scaffold are connected . The method for constructing a boiler internal scaffold according to any one of claims 1 to 3, wherein a winding device for the strand is provided .

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