JP5245104B2 - Boiler scaffold and its construction method - Google Patents

Description

  The present invention relates to a boiler internal scaffold and a construction method thereof, in particular, a boiler internal scaffold that can be constructed easily, in a short period of time, and inexpensively in a boiler scaffold built in a boiler for boiler maintenance and inspection. It relates to the construction method.

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

  An example of a conventional boiler internal scaffold constructed in the boiler will be described with reference to the drawings. Hereinafter, this conventional boiler internal scaffold is referred to as a conventional scaffold.

  FIG. 9 is a perspective view showing a conventional scaffold.

  As shown in FIG. 9, the conventional scaffold is composed of a hopper inner scaffold A, a fixed full work floor B, and a lift full work floor C.

  The hopper inner scaffold A is constructed in the boiler hopper 2 below the boiler body 1, the fixed full work floor B is built on the hopper inner scaffold A, and the lifting full work floor C is the fixed full work floor B. It is constructed above and can be moved up and down in the boiler body 1 by a plurality of jacks 23.

  In this example, the jack 23 is a center hole jack, and includes a jack body 24 and a strand 25 that is intermittently suspended and lifted by the jack body 24, and the lower end of the strand 25 is fixed to the lifting floor C. Has been. Thereby, the raising / lowering entire work floor C can be raised / lowered intermittently to a predetermined height position of the boiler body 1 by the jack 23.

  According to the above-described conventional scaffold, by raising and lowering the lifting and lowering work floor C to the predetermined height position by the jack 23, the boiler maintenance inspection and the like can be reliably performed through the lifting and lowering work floor C.

  Next, a conventional scaffold construction method will be described with reference to the drawings. Hereinafter, this conventional scaffold construction method is referred to as a conventional scaffold construction method.

  FIGS. 10A to 10C are perspective views showing a construction method of the hopper scaffold A according to the conventional scaffold construction method, and FIG. 10A is a perspective view showing a construction state of the first-stage scaffold block. ) Is a perspective view showing the construction state of the second stage scaffold block, and (c) is a perspective view showing the construction state of the third stage scaffold block.

  11 (a) to 11 (c) are perspective views showing a construction method of a fixed full work floor B by a conventional scaffold construction method, and FIG. 11 (a) is a perspective view showing an installation state of a cross beam on the fixed full work floor B. FIG. (B) is a perspective view which shows the installation state of the vertical beam of the fixed whole surface work floor B, (c) is a perspective view which shows the fixed whole surface work floor B. FIG.

  In FIG. 11, the hopper inner scaffold A is not shown.

  In order to construct a conventional scaffold by the conventional scaffold construction method, first, an in-hopper scaffold A is constructed in the boiler hopper 2. That is, as shown to Fig.10 (a), the 1st step | paragraph scaffold block 26 is installed in the bottom part of the boiler hopper 2. As shown in FIG. Each of the first-stage scaffold blocks 26 is constructed on the foundation scaffold 34. When the installation of the first stage scaffold block 26 is completed, a plurality (two in this example) of second stage scaffold blocks 27 are provided on each first stage scaffold block 26 as shown in FIG. And put them together. When the installation of the second stage scaffold block 27 is completed, a plurality of (three in this example) third stage scaffolds are placed on each second stage scaffold block 27 as shown in FIG. A block 28 is placed and connected to each other. In this way, the hopper inner scaffold A is constructed in the boiler hopper 2. The hopper inner scaffold A is a scaffold for constructing the fixed full work floor B.

  In addition, when installing each scaffold block, the walkway 29 and the diagonal support 35 are installed between each scaffold block. In addition, various members such as each scaffold block are carried into the boiler hopper 2 by a crane or the like from the opening 2A or an inspection hole (not shown) at the bottom of the boiler hopper 2. This also applies to the construction of the fixed full work floor B and the lift full work floor C described below.

  Next, as shown in FIG. 11A, the upper frame 10 is attached on the hopper inner scaffold A, and the cross beam 31 is installed on the upper frame 30. Thereafter, as shown in FIG. 4A, the vertical beam 32 is installed on the upper frame 30. Then, as shown in FIG. 5C, the scaffolding plate 33 is passed between the horizontal beam 31 and the vertical beam 32 over the entire surface. In this way, the fixed full work floor B is constructed on the hopper inner scaffold A.

  Next, as shown in FIG. 9, a lifting and lowering work surface C is constructed on the fixed work surface B. As in the case of the fixed full-scale work floor B, the lifting / lowering full-scale work floor C is composed of a horizontal beam, a vertical beam, and a scaffolding plate (both not shown) between these beams, stretched, and fixed. All the construction work of the raising / lowering work floor C is performed on the fixed work floor B. The reason for performing the construction work of the lifting / lowering entire work floor C on the fixed entire work floor B is because the members such as the cross beams and the vertical beams constituting the lifting / lowering entire work floor C are not integrated but short members are connected. This is because, because of strength, it is not possible to get on the lifting and lowering work floor C being constructed and work.

  Thus, when the raising / lowering whole work floor C is constructed | assembled, the several jack main body 24 is installed in the top part of the boiler main body 1, and the lower end of the strand 25 is fixed to the raising / lowering whole work floor C.

  As described above, a conventional scaffold composed of the hopper inner scaffold A, the fixed entire work floor B, and the lift entire work floor C is constructed by the conventional scaffold construction method.

Japanese Patent No. 2828430

  According to the above-described conventional scaffold construction method, it is possible to reliably construct the entire raising / lowering work floor C for performing maintenance and inspection of the boiler in the boiler body 1, but there are the following problems.

  (1) The hopper internal scaffold A is constructed by stacking the scaffold blocks 26, 27, and 28 in multiple stages while connecting a large number of scaffolds A to the left and right, so it takes time and labor to construct the hopper internal scaffold A.

  (2) Since the raising / lowering entire work floor C is constructed through the fixed entire work floor B constructed on the hopper inner scaffold A, the work floor is constructed in an overlapping manner. The construction period will be longer, and the construction cost will increase accordingly.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a boiler internal scaffolding and a construction method thereof that can easily, in a short period of time and inexpensively construct a boiler internal scaffolding constructed in the boiler for boiler maintenance and inspection. It is in.

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

  [1] In a method for constructing a scaffold in a boiler constructed in a boiler for maintenance and inspection of the boiler, a work floor having a length between opposing hopper wall surfaces of the boiler hopper is straddled between the hopper wall surfaces. A plurality of upper and lower tiers are placed between the hopper wall surfaces to construct a hopper inner scaffold, and then the uppermost working floor is a main beam above the hopper inner scaffold, and the scaffold on the main beam. The present invention is characterized in that a lifting / lowering work floor is constructed by passing a plate between the main beams, and the lifting / lowering work floor is suspended in a boiler body so as to be lifted and lowered by a jack.

  [2] In the method for constructing a scaffold in a boiler according to [1], a suspension plate jack in which a suspension plate in which plate members of a predetermined length are connected to each other by pins is suspended and lifted by a jack body is used as the jack, The lifting / lowering entire work floor is fixed to the suspension plate.

  [3] In the method for constructing a scaffold in a boiler as described in [1], a center hole jack is used as the jack, and the entire lifting work floor is fixed to a strand of the center hole jack. It is what has.

  [4] In a boiler internal scaffold constructed in the boiler for boiler maintenance and inspection, the boiler hopper has a length between opposing hopper wall surfaces, and extends between the hopper wall surfaces so as to straddle between the hopper wall surfaces. A hopper inner scaffold consisting of a plurality of work floors placed in multiple upper and lower stages, and an entire lifting work consisting of the uppermost work floor of the hopper inner scaffold as a main beam, and a scaffold plate sandwiched between the main beams It is characterized in that it comprises a floor and a jack that suspends the entire raising / lowering work floor in the boiler body so as to be lifted and lowered.

  [5] In the boiler scaffolding according to [4], the jack includes a suspension plate-type jack in which a suspension plate in which plate members of a predetermined length are connected to each other by pins is suspended and lifted by a jack body. Is characterized by being fixed to the suspension plate.

  [6] In the boiler scaffolding according to [4], the jack is formed of a center hole jack, and the entire raising / lowering work floor is fixed to a strand of the center hole jack. .

  [7] In the boiler scaffolding according to any one of [4] to [6], a support beam is provided between the main beams.

  [8] In the boiler internal scaffold according to any one of [4] to [7], when the scaffold plate is arranged adjacent to each other and passed between the main beams, A load distribution plate whose end overlaps with the upper surface of the support beam is fixed to the scaffold plate.

  [9] In the boiler scaffolding according to [8], the load distribution plate is characterized in that it is fixed obliquely to the scaffold plate.

  According to the present invention, a scaffold in the boiler that is constructed in the boiler for boiler maintenance and inspection can be constructed easily, in a short period of time, and at a low cost. That is, the hopper inner scaffold can be constructed simply by placing the work floor on the opposing wall surface of the boiler hopper, so that the hopper inner scaffold can be constructed in a short period of time. In addition, by using the uppermost work floor of the hopper inner scaffold as the main beam, it is possible to construct the entire lifting work floor on the main beam, thus eliminating the need to construct a fixed full work floor on the hopper scaffold. Since only one entire work floor needs to be constructed in this way, it is possible to construct the boiler inner scaffold easily, in a short period of time, and at a low cost, together with the construction of the hopper inner scaffold in a short period of time.

It is a perspective view which shows the boiler internal scaffold of this invention. It is a perspective view which shows the construction state of the work floor of the 1st step among the perspective views which show the construction method of the scaffold D in hopper by this invention. It is a perspective view which shows the construction state of the work floor of the 2nd step among the perspective views which show the construction method of the scaffold D in hopper by this invention. It is a perspective view which shows the construction state of the work floor of the 3rd step among the perspective views which show the construction method of the scaffold D in hopper by this invention. It is a perspective view which shows the construction state of the work floor of the 4th step among the perspective views which show the construction method of the scaffold hopper D by this invention. It is a perspective view which shows the hopper internal scaffold D constructed | assembled in the boiler hopper among the perspective views which show the construction method of the scaffold hopper internal D by this invention. It is a perspective view which shows the construction method of the raising / lowering full-scale work floor E by this invention, (a) is a perspective view which shows the construction state of a support beam, (b) is a perspective view which shows the construction state of a scaffold board, (c) ) Is a perspective view showing a state where the strand of the center hole jack is fixed to the built up / down entire work floor E. FIG. 4 is a side view of FIG. It is a perspective view which shows the uppermost work floor used as a main beam. It is a top view which shows a scaffold board. It is a perspective view which shows the installation state of a scaffold board. It is a side view which shows the installation state of a scaffold board. It is a perspective view which shows the conventional scaffold. It is a perspective view which shows the construction method of the scaffold A in a hopper by the conventional scaffold construction method, (a) is a perspective view which shows the construction state of the first-stage scaffold block, (b) is construction of the second-stage scaffold block The perspective view which shows a state, (c) is a perspective view which shows the construction state of the scaffolding block of the 3rd step | paragraph. It is a perspective view which shows the construction method of the fixed whole work floor B by the conventional scaffold construction method, (a) is a perspective view which shows the installation state of the cross beam of a fixed whole work floor, (b) is a vertical | vertical view of a fixed whole work floor. The perspective view which shows the installation state of a beam, (c) is a perspective view which shows a fixed full-scale work floor.

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

  FIG. 1 is a perspective view showing a boiler internal scaffold according to the present invention.

  As shown in FIG. 1, the boiler internal scaffold of this invention consists of the hopper internal scaffold D and the raising / lowering whole work floor E. As shown in FIG.

  The hopper inner scaffold D is constructed in the boiler hopper 2 below the boiler body 1, and the entire raising / lowering work floor E is constructed above the hopper inner scaffold D and can be elevated in the boiler body 1 by a plurality of jacks 3. It has become.

  In this example, the jack 3 includes a center hole jack, and includes a jack body 4 and a strand 5 that is intermittently suspended and lifted by the jack body 4. Has been. Thereby, the raising / lowering work floor E can be raised / lowered intermittently to a predetermined height position of the boiler body 1 by the jack 3.

  As the center hole jack, a jack disclosed in Patent Document 1 (Japanese Patent No. 2828430) may be used.

  In addition to the center hole jack, the jack 3 may be a suspension plate type jack that suspends and lifts a suspension plate in which plate members of a predetermined length are connected to each other by pins. In this case, the lifting work surface E is fixed to the suspension plate.

  According to the above-described scaffolding in the boiler of the present invention, the lifting and lowering work floor E is raised and lowered to a predetermined height by the jack 3 so that the boiler maintenance and inspection can be reliably performed through the lifting and lowering work floor E. It can be carried out.

  Next, a method for constructing a boiler internal scaffold according to the present invention will be described with reference to the drawings.

  FIGS. 2 (a) to 2 (e) are perspective views showing a method for constructing the hopper inner scaffold D according to the present invention, and FIGS. 3 (a) to 3 (c) are methods for constructing the raising / lowering work floor E according to the present invention. FIG.

  In FIG. 3, the hopper inner scaffold D is not shown.

  In order to construct the boiler internal scaffold according to the present invention, first, the hopper internal scaffold D is constructed in the boiler hopper 2. That is, as shown in FIG. 2A, the first-stage work floor 6 is placed between the opposing hopper wall surfaces at the bottom of the boiler hopper 2. As shown in FIG. 5, the work floor 6 is composed of a floor plate 6 </ b> A and a handrail 6 </ b> B, and has a length between hopper wall surfaces at a placement position, and is configured as a single unit. Work floors 7, 8, and 9 described later have the same length as the work floor 6 except that the upper floors are longer.

  When the installation of the first stage work floor 6 is completed, the second stage work floor 7 is placed between the opposing hopper wall surfaces on the first stage work floor 6 as shown in FIG. When the placement of the second stage work floor 7 is completed, the third stage work floor 8 is placed between the hopper wall surfaces on the second stage work floor 7 as shown in FIG. When the placement of the third work floor 8 is completed, the fourth work floor 9 is placed between the hopper wall surfaces on the third work floor 8 as shown in FIG. The uppermost work floor 9 of the uppermost stage becomes the main beam of the entire raising / lowering work floor E.

  It should be noted that various members such as work floors are carried into the boiler hopper 2 by a crane or the like from the opening 2A at the bottom of the boiler hopper 2 or an inspection hole (not shown). The same applies to the construction of the lifting / lowering overall work floor E described below.

  In this way, an inner hopper scaffold D is constructed in the boiler hopper 2 as shown in FIG. The construction of the hopper inner scaffold D is only required to place each work floor on the hopper wall surface, and therefore requires a shorter period of time than the conventional scaffold described above.

  Next, as shown in FIG. 3A, the uppermost stage of the hopper inner scaffold D, that is, the fourth stage working floor 9 is used as the main beam of the lifting / lowering whole work floor E, and the support beam 10 is inserted between the main beams. hand over. As shown in FIG. 8, this operation is performed by an operator getting on the main beam.

  Next, as shown in FIG. 3B and FIG. 7, a scaffolding plate 11 is passed between the main beams to construct an ascending / descending full work floor E. As shown in FIG. 8, this operation is also performed by a worker getting on the main beam.

  As shown in FIG. 7 to FIG. 8, if the load distribution plate 12 whose end part partially protrudes from the scaffold plate 11 is obliquely fixed to the scaffold plate 11 on the upper surface of the center portion of the scaffold plate 11, When the scaffolding plates 11 are arranged side by side and passed between the main beams, the end of the load distribution plate 12 overlaps the upper surface of the adjacent scaffolding plate 11, so that the load of the scaffolding plate 11 is dispersed. As a result, the bending of the scaffold plate 11 is reduced and the strength of the scaffold plate 11 is increased. The reason why the load distribution plate 12 is fixed obliquely with respect to the scaffold plate 11 is to prevent interference between adjacent load distribution plates 12 as shown in FIG.

  As shown in FIG. 6, if the end portion of the load distribution plate 12 is overlapped with the upper surface of the support beam 10 passed between the main beams, a part of the load applied to the scaffold plate 11 is applied to the support beam 10. Therefore, this also reduces the bending of the scaffold plate 11 and further increases the strength of the scaffold plate 11.

  The fixing position of the load distribution plate 12 to the scaffold plate 11 does not necessarily have to be the central portion, and the fixing direction of the load distribution plate 12 to the scaffold plate 11 does not necessarily have to be oblique.

  In this way, the lifting / lowering entire work floor E has the uppermost work floor 9 as a main beam, and can be built by workers on the main beam. There is no need to construct a fixed full work floor B on D. Therefore, in conjunction with constructing the hopper scaffold D in a short period of time, the boiler scaffold can be constructed easily, in a short period of time and at low cost.

  In this way, when the lifting entire work floor E is constructed, as shown in FIG. 1, a plurality of jack bodies 4 are installed on the top of the boiler body 1, and as shown in FIGS. 3 (c) and 4, The lower end of the strand 5 is fixed to the raising / lowering work floor E.

  As described above, according to the present invention, the boiler internal scaffolding of the present invention including the hopper internal scaffolding D and the lifting / lowering entire work floor E is constructed.

  As described above, according to the present invention, the hopper inner scaffold D can be constructed simply by placing the work floor on the opposing wall surface of the boiler hopper 2, compared to the conventional scaffold construction method, The hopper inner scaffold D can be constructed in a short period of time. Moreover, since the work floor at the uppermost stage of the hopper inner scaffold D is used as the main beam, it is possible to construct the entire lifting work floor E on the main beam, so that the entire fixed surface on the hopper inner scaffold D as in the conventional scaffold. There is no need to construct the work floor B. Since only one entire work floor needs to be constructed in this way, it is possible to construct the boiler inner scaffold easily, in a short period of time and at a low cost, together with the construction of the hopper inner scaffold D in a short period of time.

A: Scaffolding inside hopper B: Fixed working floor C: Lifting working floor D: Scaffolding working floor E: Lifting working floor 1: Boiler body 2: Boiler hopper 2A: Opening 3: Jack 4: Jack body 5 : Strand 6: First stage work floor 6A: Floor board 6B: Handrail 7: Second stage work floor 8: Third stage work floor 9: Fourth stage work floor 10: Support beam 11: Scaffold board 12: Load Dispersion plate 23: Jack 24: Jack body 25: Strand 26: First stage scaffold block 27: Second stage scaffold block 28: Third stage scaffold block 29: Crosswalk 30: Upper frame 31: Cross beam 32: Vertical beam 33: Scaffold plate 34: Foundation scaffold 35: Diagonal support

Claims (9)

In the construction method of the scaffolding in the boiler that is built in the boiler for boiler maintenance and inspection,
A work floor having a length between opposing hopper wall surfaces of the boiler hopper is placed between the hopper wall surfaces in a plurality of stages in the vertical direction so as to straddle between the hopper wall surfaces, thereby constructing a scaffold inside the hopper, The upper working floor is the main beam above the scaffold in the hopper, and a lifting work floor is constructed by passing a scaffolding plate between the main beams on the main beam. A method for constructing a scaffold in a bora, wherein the scaffold is suspended in a boiler body so as to be lifted and lowered by a jack.   As the jack, a suspension plate in which plate members of a predetermined length are connected to each other by a pin is suspended by a jack body, and a lifting plate type jack that is lifted is used to fix the lifting entire work floor to the suspension plate. The construction method of a scaffold in a boiler according to claim 1.   The boiler internal scaffolding construction method according to claim 1, wherein a center hole jack is used as the jack, and the lifting / lowering entire work floor is fixed to a strand of the center hole jack.   In a boiler inner scaffold built in the boiler for boiler maintenance and inspection, etc., it has a length between opposing hopper wall surfaces of the boiler hopper, and is vertically multi-staged between the hopper wall surfaces so as to straddle between the hopper wall surfaces. A hopper inner scaffold composed of a plurality of work floors to be placed, and the upper and lower working floors of the hopper inner scaffold, each of which has a main beam as a main beam, and a scaffold plate sandwiched between the main beams, A boiler internal scaffolding comprising: a jack for suspending the lifting and lowering entire work floor in a boiler body so as to be lifted and lowered.   The jack is a suspension plate type jack that suspends and lifts a suspension plate in which plate members of a predetermined length are connected to each other by a pin, and the entire lifting work floor is fixed to the suspension plate. The boiler internal scaffold according to claim 4.   The boiler internal scaffolding according to claim 4, wherein the jack is a center hole jack, and the lifting and lowering work floor is fixed to a strand of the center hole jack.   The boiler inner scaffold according to any one of claims 4 to 6, wherein a support beam is provided between the main beams.   The scaffold plate is fixed to the scaffold plate with a load distribution plate whose end overlaps with an upper surface of the adjacent scaffold plate or the support beam when the scaffold plates are aligned with each other and passed between the main beams. The boiler internal scaffold according to any one of claims 4 to 7, characterized in that it is a feature.   The boiler internal scaffold according to claim 8, wherein the load distribution plate is obliquely fixed to the scaffold plate.

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