JP4795752B2 - Repair scaffold used in coke oven carbonization chamber and its stacking method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a repair scaffold used by a worker in a carbonization chamber and a method for stacking the same when performing hot repair of a coking chamber of a coke oven.

FIG. 2 is a horizontal sectional view schematically showing an example of the arrangement of the carbonizing chamber and the combustion chamber of the coke oven. In FIG. 2, only the vicinity of one end (that is, the left side) is shown, and the vicinity of the other end (that is, the right side) is not shown.
In the coke oven, as shown in FIG. 2, combustion chambers 1 in which fuel burns and carbonization chambers 2 in which coal is charged are alternately arranged. Coal charged into the carbonization chamber 2 is dry-distilled by heat generated in the combustion chamber 1 and becomes coke. The combustion chamber 1 is composed of wall bricks 3a and pillar bricks 3b. A kiln fitting 4 is attached to the end of the combustion chamber 1 to prevent the wall bricks 3a from protruding.

  When the coke oven is operated for a long period of time, the wall surface composed of the wall bricks 3a is deformed and eroded, and the wall surface is cracked. If the operation is further continued, cracks penetrate from the combustion chamber 1 to the carbonization chamber 2, and fine coal powder floating in the carbonization chamber 2 and CO gas generated by dry distillation flow into the combustion chamber 1. Coal powder and CO gas disturb the mixing ratio of fuel and air in the combustion chamber 1 (so-called air-fuel ratio), so that a large amount of soot is generated. If the wall surface is deformed so as to protrude toward the carbonization chamber 2 side, it becomes difficult to push the coke from the carbonization chamber 2.

Therefore, when deformation or erosion of the wall surface separating the carbonizing chamber 2 and the combustion chamber 1 occurs, it is necessary to repair the corresponding portion by brick replacement or the like. At that time, since no worker can enter the combustion chamber 1, repair is performed from the carbonization chamber 2 side. Moreover, the repair is performed at a high temperature without cooling the inside of the carbonizing chamber 2 as called hot repair. The main reason is
(1) Not only does it take a long time to cool the carbonization chamber 2 to room temperature, but it also takes a long time to raise the temperature after the repair is completed.
(2) This is because the operation of the coke oven is hindered by deformation of the wall surface and mineral change of the refractory (ie, wall brick, joint material) due to the temperature change in the carbonization chamber 2.

Therefore, various techniques have been studied in order to protect workers who perform repair work (that is, hot repair) in a high-temperature environment.
For example, Patent Document 1 discloses a heat insulating box that protects workers who perform repair work in a carbonization chamber. In this technique, a heat insulation box formed into a rectangular parallelepiped using a heat insulation board is inserted into a carbonization chamber, and a worker performs repair work in the heat insulation box, so that the worker is protected from heat in the carbonization chamber. However, when the wall surface is deformed so as to protrude toward the carbonization chamber 2, it is difficult to insert the heat insulation box into the carbonization chamber. Moreover, since the heat insulation box is cooled using cooling water, there is a risk of causing a water vapor explosion if water leaks.

  Patent Document 2 discloses a box-shaped repair device in which a steel outer plate is formed into a rectangular parallelepiped and a heat insulating material is attached to the inside of the outer plate. In this technique, since the box-shaped repair device is a molded body of a steel plate, it is difficult to insert the box-shaped repair device into the carbonization chamber when the wall surface is deformed so as to protrude toward the carbonization chamber 2. In addition, in this technique, cool air is blown from the lower part of the box, but in this method, the lower part of the box cannot be repaired and the function of arbitrarily repairing a necessary part is not satisfied.

In the hot repair of the carbonization chamber 2, not only a technique related to the heat insulation of the work area (see, for example, Patent Documents 1 and 2) but also a technique for safely and reliably performing work at a high place. That is, the height of the carbonization chamber 2 is about 7 m, and when repairing the wall surface and ceiling of the carbonization chamber 2, a scaffold that enables repair work at a high place is indispensable.
For example, Patent Document 3 discloses a scaffold used in the construction of a coke oven. In this technique, the scaffold is carried into the carbonization chamber using an overhead traveling crane. In other words, this technology can be applied to the work of constructing the wall of the carbonization chamber by furnace construction. However, after constructing the carbonization chamber ceiling, the carbonization chamber ceiling must be removed in order to apply this technique. Therefore, it is difficult to apply the technique disclosed in Patent Document 3 in order to repair the wall surface of the carbonization chamber of the coke oven that has started operation.

  Patent Document 3 discloses a technique for securing the stability of the entire scaffold by connecting the scaffold in the furnace and the scaffold outside the furnace. If it is a furnace construction as described in Patent Document 3, it is possible to use this out-of-furnace scaffold. However, the hot repair of the coking chamber is performed while the coke oven is operating. Therefore, in hot repair, an extruder and a guide vehicle run in front of the furnace during work, so it is difficult to install an out-of-furnace scaffold.

That is, it is difficult to apply the technique disclosed in Patent Document 3 to hot repair of the carbonization chamber.
JP-A-8-81681 JP-A-5-239463 Japanese Patent Publication No. 60-49675

  The present invention has been made in order to solve the above-mentioned problem, and when performing hot repair of the coking oven coking chamber, a repair scaffold for the worker to work safely and reliably by a simple means, and The purpose is to provide a stacking method.

  The present invention is a box-like repair scaffold inserted into a carbonization chamber of a coke oven, and includes a work upper surface facing the ceiling surface of the carbonization chamber, a slide lower surface facing the floor surface of the carbonization chamber, and a slide. A support column having a length of 0.4 to 1 m for fixing and supporting the work upper surface above the moving lower surface, the width of the sliding lower surface is made smaller than the width of the work upper surface, and at least three edges of the work upper surface This is a repair scaffold in which a protrusion is provided on the part.

  Further, the present invention provides a method for assembling a box-shaped repair scaffold inserted into a carbonization chamber of a coke oven, and uses a strut having a length of 0.4 to 1 m to support and fix the work upper surface above the slide lower surface. The width of the lower surface for sliding is made smaller than the width of the upper surface for work, and a repair scaffold provided with protrusions on at least three ends of the upper surface for work is inserted into the carbonization chamber and fixed to the backstay hardware. Next, the second stage scaffolding is piled up on the work upper surface of the repairing scaffolding and secured to the backstay hardware, and the repairing scaffolding located on the upper stage is sequentially piled up and secured to the backstay hardware. It is a method of stacking repair scaffolds to be fixed.

  According to the present invention, when performing hot repair of a carbonization chamber, an operator can work safely and reliably with simple means.

FIG. 1 is a perspective view schematically showing an example of a repair scaffold according to the present invention. The repair scaffold according to the present invention has a work upper surface 6 facing the ceiling surface of the carbonization chamber, a slide lower surface 7 facing the floor surface of the carbonization chamber, and a work upper surface 6 fixed above the slide lower surface 7. And supporting column 8.
The height of the column 8 needs to satisfy the range of 0.4 to 1 m. If the height of the column 8 is less than 0.4 m, many repair scaffolds will be piled up when repairing the upper part of the wall of the carbonization chamber, so there is a risk that the safety of the repair work cannot be secured. It takes a lot of time to build up the scaffolding for repair. On the other hand, if the height of the support column 8 exceeds 1 m, the weight of the repair scaffold increases, and the load for the operator to lift the refractory material and equipment used for repair work to the work upper surface 6 increases.

  FIG. 1 shows an example in which six struts 8 are provided. However, in the present invention, the number of struts 8 provided in one repairing scaffold is not limited to a specific value, and a vehicle for transporting a repairing scaffold is provided. Appropriately set according to the dimensions of the wall of the carbonization chamber that requires a load limit or repair. However, from the viewpoint of reducing the weight of the repair scaffold, it is preferable to use a steel pipe or a shaped steel for the support column 8. Further, the beam 9 for reinforcing the column 8 is not necessarily provided. In the present invention, the number of beams 9 provided in one repair scaffold is not limited to a specific numerical value, and is appropriately set according to the size, weight, etc. of the repair scaffold.

  The work upper surface 6 is a plane that serves as a work place for workers during repair work. When repairing the high position of the wall surface of the carbonization chamber, repair scaffolds are stacked on the work upper surface 6. Accordingly, the protrusions 10 are provided at the end portions of at least three sides of the work upper surface 6 to prevent the upper repair scaffold from sliding down. In order to prevent the repair scaffold piled up on the work upper surface 6 from slipping down, it is preferable to provide protrusions 10 at the ends of all four sides of the work upper surface 6. However, as will be described later, in consideration of sliding the upper repair scaffold on the work upper surface 6 when stacking the repair scaffold, the protrusion 10 is not provided on one side of the work upper surface 6 and the like. Protrusions 10 are preferably provided at the ends of the three sides.

  The height of the protrusion 10 is preferably within a range of 30 to 50 mm. If the height of the protrusion 10 is less than 30 mm, it becomes unstable when the repair scaffold of the present invention is stacked. On the other hand, when the height of the protrusion 10 exceeds 50 mm, it becomes higher than the scaffold plate 13 described later, and the danger of the operator hitting becomes high. As an example of the protrusion 10, FIG. 1 shows an example in which L-shaped steel is joined to the end of the work upper surface 6, but the protrusion 10 is not limited to a specific structure in the present invention. For example, it is possible to form the protrusion 10 by bending the end portion of the work upper surface 6 upward.

  The sliding lower surface 7 is a flat surface that slides on the floor surface of the carbonization chamber when the repair scaffold is inserted into the carbonization chamber. That is, in the horizontal sectional view of the coke oven shown in FIG. 2, the repair scaffold is inserted by sliding on the floor surface from the opening of the carbonization chamber 2. Further, when the repairing scaffold is taken out from the carbonization chamber 2, it is slid on the floor surface. Therefore, it is preferable to warp the end of the sliding lower surface 7 in the traveling direction upward. Here, a portion where the end portion of the sliding lower surface 7 is warped upward is referred to as a warped portion 11.

In addition, when repairing scaffolds are piled up to repair a high place in the carbonizing chamber 2, the work upper surface 6 of the lower repair scaffold is slid. By providing a warped portion 11 at the end of the sliding lower surface 7 and using a device for working at a high place such as a table lifter, a repair scaffold can be easily stacked.
In consideration of stacking the repair scaffolds in this way, it is necessary to make the width of the sliding lower surface 7 smaller than the width of the working upper surface 6 (that is, the interval between the outer surfaces of the protrusions 10).

  FIG. 3 is a vertical sectional view schematically showing an example in which a repair scaffold is inserted into the carbonization chamber 2. When repairing the wall surfaces of the carbonization chambers 2a and 2b in FIG. 3, the radiant heat generated from the wall surfaces is blocked to protect the workers by covering the sound walls and ceiling portion on the opposite side with the refractory 12 . In order to cover the wall and ceiling not to be repaired with the refractory 12, a heat insulating box or the like may be used. However, since the blockage of the radiant heat generated from the wall surface is not the object of the present invention, detailed description thereof is omitted here.

Since the repair site on the wall surface of the carbonization chamber 2a is at a low position, only one repair scaffold is inserted into the carbonization chamber 2a. Further, the scaffold plate 13 is placed on the work upper surface 6. The thickness of the scaffold plate 13 is preferably equal to the height of the protrusion 10. By placing the scaffolding plate 13 on the work upper surface 6, it is possible to prevent the worker from hitting the protrusion 10 and falling over.
On the other hand, since the repair site of the wall surface of the carbonization chamber 2b is at a high position, repair scaffolds are stacked in the carbonization chamber 2b. In that case, the upper sliding lower surface 7 is slid on the lower working upper surface 6 and the repair scaffolds are sequentially stacked. FIG. 3 shows an example in which four repair scaffolds are stacked. In order to prevent the worker from falling on the protrusion 10, the scaffolding plate 13 is placed on the uppermost work upper surface 6.

In addition, the code | symbol 14 in FIG. 3 is a ceiling suspension tool for preventing that a ceiling part falls in the case of repair work of a carbonization chamber. However, since the prevention of the falling of the ceiling is not the object of the present invention, the description of the ceiling hanger 14 is omitted here.
In this way, since the repair scaffold is inserted into the carbonization chamber from the opening of the carbonization chamber, it is not necessary to remove the ceiling of the carbonization chamber. In addition, by using the ceiling hanger 14 to store a healthy ceiling portion, it is possible to combine the repaired wall surface with a healthy ceiling portion after the wall surface repair work is completed. Further, when the ceiling part needs to be repaired, it is possible for the worker to repair the ceiling part by further stacking the scaffolds for repair. In addition, insertion and removal of the repair scaffold at a high place can be easily performed by using a device for working at a high place such as a table lifter.

  The repair scaffold inserted into the carbonization chamber 2 is locked and fixed to a backstay hardware provided in the vicinity of the opening to prevent the repair scaffold from moving from a predetermined position in the carbonization chamber 2. FIG. 4 shows an example of fixing the repair scaffold inserted into the carbonization chamber 2 at a predetermined position. In the example shown in FIG. 4, the fixing member 16 is fixed to the backstay hardware 5 via the clamp 15, and the repair scaffolding column 8 is fixed to the fixing member 16 via the joint 17. However, in the present invention, the means for fixing the repair scaffold in a predetermined position is not limited to the configuration shown in FIG. For example, it is also possible to fix the column 8 of the repair scaffold to the fixing member 16 using a chain or a wire instead of the joint 17.

  As described above, according to the present invention, when performing hot repair of a carbonization chamber, an operator can work safely and reliably with simple means.

  A repair scaffold having the structure shown in FIG. 1 was produced. A protrusion 10 (height 40 mm) was formed by joining L-shaped steel (JIS standard G3192) to the ends of the three sides of the work upper surface 6 (JIS standard SS400 steel plate). The distance of the outer surface of the protrusion 10 (that is, the width of the work upper surface 6) was 240 mm. A warped portion 11 is provided in the traveling direction of the lower surface 6 for sliding (steel plate of JIS standard SS400). As the support column 8, six steel pipes (JIS standard A8951) having a length of 900 mm were used. The beam 9 used steel pipes (JIS standard G3452) at three locations.

  Next, as shown in FIG. 3, this repair scaffold was inserted into the carbonization chamber, and the repair scaffold was appropriately stacked according to the height of the repaired portion of the wall surface to perform hot repair. A scaffold plate 13 was placed on the work upper surface 6 of the uppermost repair scaffold. The thickness of the scaffold board 13 was 40 mm. Moreover, in order to cover the wall surface and ceiling part which are not repaired with the refractory material 12, the heat insulation box of the predetermined shape was used. Further, the ceiling hanger 14 was used to prevent the ceiling portion from falling.

At that time, as shown in FIG. 4, the column 8 of the repair scaffold was fixed to the backstay hardware using the clamp 15, the fixing member 16, and the joint 17.
In this way, the coke oven was operated while hot repairing the wall of the carbonization chamber for 30 days. During that period, the repair scaffold did not deform or collapse, and the work could be done without any problems.

It is a perspective view which shows typically the example of the scaffold for repair of this invention. It is a horizontal sectional view showing typically an example of arrangement of a carbonization room and a combustion room of a coke oven. It is a vertical sectional view showing typically the example which inserted the scaffold for repair in the carbonization room. It is a horizontal sectional view showing typically an example which fixes a scaffold for repair inserted in a carbonization room in a predetermined position.

Explanation of symbols

1 Combustion chamber 2 Carbonization chamber
3a wall brick
3b Pillar brick 4 Kiln fitting 5 Backstay hardware 6 Work upper surface 7 Sliding lower surface 8 Post 9 Beam
10 protrusion
11 Warpage
12 Refractories
13 Scaffolding board
14 Ceiling hanger
15 Clamp
16 Fixing member
17 Joint

Claims (2)

  A box-shaped repair scaffold to be inserted into a coking chamber of a coke oven, a working upper surface facing the ceiling surface of the carbonizing chamber, a sliding lower surface facing the floor surface of the carbonizing chamber, and the sliding lower surface And a support column having a length of 0.4 to 1 m for fixing and supporting the work upper surface, wherein the width of the sliding lower surface is made smaller than the width of the work upper surface, and at least three sides of the work upper surface. A scaffold for repair, characterized in that a protrusion is provided at the end of the repair. In the method of assembling a box-shaped repair scaffold to be inserted into the carbonization chamber of a coke oven, the working upper surface is fixed and supported above the sliding lower surface using a strut having a length of 0.4 to 1 m, and the sliding lower surface is supported. The width of the work upper surface is made smaller than the width of the work upper surface, and a repair scaffold provided with protrusions on the ends of at least three sides of the work upper surface is inserted into the carbonization chamber and fixed to the backstay hardware, Next, the second-stage repair scaffold is stacked on the work upper surface of the repair scaffold and secured to the backstay hardware, and the repair scaffold located at the upper stage is sequentially stacked and secured to the backstay hardware. A method of stacking scaffolds for repair, characterized by:

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