JP4045309B2 - Removal method of refractory lining layer - Google Patents

Description

  The present invention relates to a method for removing a predetermined thickness of a refractory lining layer coated on the inner wall surface of a furnace or chimney, and more specifically, it is safe with low noise while suppressing generation of dust in consideration of environmental problems. The present invention relates to a technique that enables efficient and quick removal.

  Conventionally, repair of a deteriorated lining layer has been done by using an equipment such as a wheel cutter or an air breaker, where an operator gets on a workbench such as a gondola that lifts and lowers the furnace or chimney with a wire rope using a winch installed on the ground. The lining layer is crushed and removed, and a new lining is sprayed after removal.

  By the way, in the above-described method, a large vibration is transmitted to the worker and a large noise is generated. Further, the lining layer to be crushed and removed has a large and small shape and is scattered around the worker to generate a large amount of dust, which is dangerous and the working environment is extremely bad.

Thus, a chimney lining layer repair device for improving the working environment has been developed (see, for example, Patent Document 1). This repair device is equipped with a rotating cutter on the device base that turns on the gondola along the chimney inner periphery, and forms a grid-like kerf so that the lining layer is partitioned into a rectangular shape with the rotating cutter while turning the device base. The lining layer can be easily disassembled. The present invention has developed a method capable of more efficiently and quickly removing the lining layer partitioned by the kerf by the repair device.
JP-A-6-235512

  The problem to be solved by the present invention is to solve these conventional problems, and to suppress the generation of dust in consideration of environmental problems, while being able to remove the lining layer safely, efficiently and quickly with low noise. It is to provide a method for removing a layer.

The configuration of the present invention that solves this problem is as follows.
1) In the method of removing a fire-resistant lining layer having a predetermined thickness coated on the inner wall surface of a fire-resistant wall, the fire-resistant lining layer is divided into a plurality of kerfs, and brackets are provided on two adjacent small lining layer surfaces. The brackets are detachably fixed, and each bracket is pressed in the separating direction with a telescopic cylinder arranged between the brackets, and the small lining layer to which the brackets are fixed is shifted and removed from the inner wall with the same pressing force. 2) Removal method of refractory lining layer characterized in that 2) The removal method of refractory lining layer as described in 1) above, wherein the lining layer is shifted in the direction of the region where there is no lining layer, and the lining layer is removed. The method for removing a refractory lining layer described in 1) above, wherein the refractory lining layer is peeled off by shifting by the groove width of the kerf. 4) A bracket is fixed to the surface of two adjacent small lining layers. 5) The method for removing a fire-resistant lining layer according to any one of 1) to 3), wherein the small lining layer is peeled off by a cylinder having brackets attached to both ends or one side. ) To 4) The method for removing a fire-resistant lining layer 6) The method for removing a fire-resistant lining layer according to any one of 1) to 5), wherein the bracket is fixed to the surface of the small lining layer with an anchor 7) The method 8 for removing a fire-resistant lining layer according to any one of 1) to 6), wherein the wall is a chimney cylinder, and a work table that can be raised and lowered is provided in the chimney, and the work is peeled off on the work table. ) Fireproofing as set forth in 7) above, wherein a load handling tool for suspending the bracket and the cylinder from above is provided on the work table so as to be movable in the circumferential direction of the work table, and the removal position can be changed by moving the load work tool. Sex rye 9) Removal method of the lining layer 9) A removal method 10) of the refractory lining layer according to 8) above, wherein a guide rail in the circumferential direction is installed above the outer peripheral end of the work table, and a cargo handling device is suspended on the guide rail. A method for removing a refractory lining layer described in 9) above, wherein a plurality of cargo handling devices with brackets and cylinders suspended are hung on a guide rail and a plurality of places are peeled and removed in parallel. In the method for removing a refractory lining layer according to any one of 7) to 10), after peeling in the lateral direction along the inner periphery, the peeling is performed in order from the upper stage to the lower stage.

  According to the present invention, since the bracket fixed to the partitioned small lining layer is pressed by the cylinder and peeled off, vibration and noise are compared with the conventional method of crushing and removing with a striking force such as a wheel cutter or an air breaker. In addition, the predetermined area can be surely removed in a unit of section, and since the scattering of the small pieces of the lining layer is small, it is safe and hardly generates dust, and can be repaired efficiently and quickly with low noise.

  In the present invention, as a peeling method of the small lining layer, the peeling is performed by removing the small lining layer in the direction of the area where there is no open lining layer, or by peeling the small lining layer by the groove width of the kerf. There is a way to do it. The groove width of the kerf is generally 4 to 10 mm, but if the groove width is 4 to 5 mm, it can be reliably peeled off. In addition to the up / down / left / right direction, the peeling direction includes a pattern in which the direction is changed during the operation. There are a case where the kerf is formed so as to be partitioned in a lattice shape, and a case where the kerf is formed so as to be partitioned in a plurality of directions in one direction, up and down or left and right. Further, when it is difficult to shift the small lining layer, such as first and last peeling, it may be performed manually as usual.

  The brackets are fixed to two adjacent small lining layer surfaces, or fixed every other one, and are selected according to the size of the small lining layer, the size of the cylinder, and the stroke. In general, the cylinder and the bracket are used as separate parts and suspended independently at three points. However, there are also cases where the bracket is attached to both ends or one side of the cylinder and suspended independently at one or two points. The bracket is generally fixed to the surface of the small lining layer with an anchor, but other means can be adopted as long as it can withstand a load of about 1 to 3 tf. Cylinders are hydraulic, pneumatic, electric, etc., and are arbitrarily selected.

  When the fire wall is a cylinder with a chimney, a work table such as a gondola is provided in the chimney, a cylinder operating device for extending and retracting the cylinder is provided on the work table, and the peeling work is performed on the work table. A guide rail in the circumferential direction is installed above the outer peripheral edge of the workbench, and a load handling equipment is hung on the guide rail so that it can run. It is safe to prevent the small linings from falling or scattering. Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is an explanatory view showing raising and lowering of the gondola of the embodiment, FIG. 2 is a plan view of the gondola of the embodiment, FIG. 3 is a side view of the gondola of the embodiment, FIG. FIG. 6 is an explanatory view showing a small lining layer removing process of the embodiment.

  In this embodiment, as shown in FIG. 1, a circular gondola 3 as a work table is connected to a ground gondroinch (not shown) with a wire rope 5 and suspended in the chimney 1 so as to be able to move up and down. The wire rope 5 is supported by being changed in direction by a gondola arm 6 at the upper end of the chimney 1 and a turning sheave 7, and is fixed to the ground G by a gondro inch and an anchor weight (not shown).

  As shown in FIGS. 2 and 3, the gondola 3 has a circumferential hanger rail 3a that is divided into eight bodies above the outer peripheral end thereof and is laid in a circumferential shape by a plurality of L-shaped support columns 3b. A cargo handling device 4 provided with a hanger single vehicle 3c is suspended from the rail 3a so as to be able to travel, and a wire 4b provided with a swivel snap 4a is suspended from the cargo handling device 4. The bracket 8 is made of steel and has a latching portion 8a for latching the swivel snap 4a on the top thereof. In addition, if the support | pillar 3b is arrange | positioned inside and the cargo handling tool 4 is suspended outside, it can be made to adjoin to the lining layer 2, and suspension will be stabilized.

  First, in the repair device disclosed in Japanese Patent Laid-Open No. 6-235512, grooves 2a having a groove width of 5 mm are formed in a lattice shape on the deteriorated lining layer 2 of the chimney 1, and divided into small lining layers 2b each having a size of 300 × 600 mm. . At this time, if there is a wire mesh or a reinforcing bar in the lining layer 2, it is cut together. Next, the surface of the small lining layer 2b to be peeled off and the surface of the adjacent small lining layer 2b are perforated, and the bracket 8 is fixed with the anchor bolt 8b and suspended by the cargo handling device 4 to form a predetermined interval between the brackets 8. To do. At this time, if the anchor bolt 8b is driven by the cylinder 7, the operation can be performed with low noise.

  A cylinder 7 connected to a hydraulic device (not shown) is disposed between the brackets 8 in the lateral direction and is suspended by a wire 4b. The hydraulic device is operated to slowly extend the cylinder 7. Each bracket 8 is pressed in the separating direction by the pressing force of the cylinder 7, and one of the small lining layers 2b to which the bracket 8 is fixed is displaced in the direction of the region where the lining layer 2 is not present, so that the cylinder 1a of the chimney 1 is removed. Gradually peels off. At this time, even if there is no region without the lining layer 2, it is peeled off if the groove width of the kerf 2 a is about 4 to 5 mm. Although the bracket 8 and the cylinder 7 try to scatter due to the impact of the peeling, it is safe because it is suspended by the cargo handling device 4.

  When the small lining layer 2b is completely detached from the cylindrical body 1a, the peeled small lining layer 2b is transported to the predetermined position along the hanger rail 3a by the cargo handling tool 4, and the bracket 8 is removed and a crusher or the like not shown is crushed. Crush with a machine.

  Subsequently, the removed bracket 8 is perforated on the surface of the small lining layer 2b adjacent to the small lining layer 2b on the opposite side and fixed with the anchor bolt 8b, and the cylinder 7 extended by the previous peeling is degenerated to degenerate the bracket. It arrange | positions between 8 and the cylinder is extended again by operating a hydraulic device. The small lining layer 2b located on the side of the peeling trace 2c is peeled off in the direction of the peeling trace 2c by the pressing force of the cylinder 7, and the post-conveying bracket 8 is removed and crushed in the same manner as before.

  Thereafter, this series of steps is repeated according to the required location, and the repair is completed by spraying a new lining on the removal trace. If the repair site covers the entire surface, it will be removed repeatedly from the top to the bottom.

  The present invention can be applied not only to the lining layer of a chimney or the lining layer of a fireproof wall of a furnace such as a thermal power plant, an ironworks, or an incinerator, but also to peeling of the outer wall of a building.

It is explanatory drawing which shows raising / lowering of the gondola of an Example. It is a top view of the gondola of an Example. It is a side view of the gondola of an Example. It is a side view of the material handling implement of an Example. It is sectional drawing which shows fixation of the bracket of an Example. It is explanatory drawing which shows the removal process of the small lining layer of an Example. It is explanatory drawing which shows the removal process of the small lining layer of an Example. It is explanatory drawing which shows the removal process of the small lining layer of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chimney 1a Cylinder body 2 Lining layer 2a Cut groove 2b Small lining layer 2c Detachment trace 3 Gondola 3a Hanger rail 3b Post 3c Hanger motorcycle 4 Cargo handling equipment 4a Swivel snap 4b Wire 5 Wire rope 6 Gondola arm 6a Turning sheave 8 Cylinder 7 Hook 8b Anchor bolt G Ground

Claims (11)

  In the method of removing a fire-resistant lining layer with a predetermined thickness coated on the inner wall of a fire-resistant wall, the fire-resistant lining layer is divided into a plurality of kerfs, and brackets are attached to two adjacent small lining layer surfaces. It is fixed freely, each bracket is pressed in the direction of separation with an extendable cylinder placed between the brackets, and the small lining layer to which the brackets are fixed is shifted and removed from the inner wall with the same pressing force. A method for removing a fireproof lining layer.   2. The method for removing a refractory lining layer according to claim 1, wherein the small lining layer is shifted and peeled in the direction of the region having no lining layer.   2. The method for removing a refractory lining layer according to claim 1, wherein the small lining layer is separated by being shifted by the groove width of the cut groove.   The method for removing a refractory lining layer according to any one of claims 1 to 3, wherein a bracket is fixed to and peeled from two adjacent small lining layer surfaces.   The method for removing a refractory lining layer according to any one of claims 1 to 4, wherein the small lining layer is peeled off by a cylinder having brackets attached to both ends or one side.   The method for removing a refractory lining layer according to any one of claims 1 to 5, wherein the bracket is fixed to the surface of the small lining layer with an anchor.   The method for removing a refractory lining layer according to any one of claims 1 to 6, wherein the refractory wall is a cylinder of a chimney, a work table that can be raised and lowered is provided in the chimney, and the work is peeled off on the work table.   The fire resistance according to claim 7, wherein a loading tool for suspending the bracket and the cylinder from above is provided on the work table so as to be movable in the circumferential direction of the work table, and the removal position can be changed by moving the loading tool. How to remove the lining layer.   The method for removing a fire-resistant lining layer according to claim 8, wherein a circumferential guide rail is installed above the outer peripheral end of the work table, and a cargo handling equipment is suspended on the guide rail so as to be able to travel.   The method for removing a refractory lining layer according to claim 9, wherein a plurality of cargo handling devices with the bracket and the cylinder suspended are suspended from the guide rail, and a plurality of portions are peeled and removed in parallel.   The method for removing a refractory lining layer according to any one of claims 7 to 10, wherein the small lining layer is peeled in the lateral direction along the inner periphery of the chimney, and then peeled and removed in order from the upper stage to the lower stage.

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