JP4369355B2 - How to remove fireproof lining - Google Patents

Description

  The present invention relates to a method for removing a refractory lining having a predetermined thickness covered with an iron skin such as a furnace or a chimney, and more particularly, to a technique that enables efficient removal while suppressing generation of dust with low noise.

  In the past, repair of degraded refractory linings has been done by using an equipment such as a wheel cutter or an air breaker, where an operator gets on a gondola that lifts and lowers the furnace or chimney with a wire rope using a winch installed on the ground. This is done by crushing and removing the lining and then spraying with a new refractory material.

  By the way, in the above method, a large vibration is transmitted to the worker and a large noise is generated, and the noise leaks to the outside and becomes a noise pollution. In addition, the crushed pieces of the fire-resistant lining that had been crushed and removed scattered around the worker in various sizes, generating a large amount of dust, which was dangerous and the working environment was extremely bad.

Therefore, a chimney lining repair device for improving the working environment and increasing efficiency has been developed (see, for example, Patent Document 1). This repair device is provided with a rotary cutter on the device base that turns on the gondola along the chimney inner circumference, and the grid-like kerf is formed so that the fireproof lining is partitioned into a rectangular shape with the rotary cutter while turning the device base. It is formed so that the refractory lining can be easily disassembled. In recent years, there has been a demand for a technology that can be efficiently removed in consideration of environmental problems, and the present invention has been made in view of such circumstances.
JP-A-6-235512

  The problem to be solved by the present invention is to solve these conventional problems and to provide a method for removing a fireproof lining that can efficiently remove the fireproof lining while suppressing generation of dust with low noise. is there.

The configuration of the present invention that solves this problem is as follows.
1) Reinforcing reinforcing bars between a plurality of studs projecting from the steel wall of the fire wall, arranging double rows of reinforcing bars in the same direction, and covering the reinforcing bars and studs with a predetermined thickness to cover the reinforcing bars and studs A method for removing a fire-resistant lining of a fire wall formed by forming kerfs along the reinforcing bar arrangement direction at the positions closest to both sides of the rebar of the fire-resistant lining, and the direction in which the fire-resistant lining is orthogonal to the reinforcing bar Auxiliary reinforcements are arranged on the side, and the auxiliary reinforcements are cut at the same time when the kerf is formed , and the refractory lining is divided into an area with a stud and an area without a stud by the kerf, and the refractory lining. The refractory lining is characterized in that a groove is formed so that a region where the stud is present is narrower than a region where the stud is not present, and each region is separated and removed along the direction of the groove. Removal method 2) The fire wall is a fire wall of a chimney, and a gondola is installed in the chimney so that it can be raised and lowered. The refractory lining is removed by the method of removing the refractory lining described in 1) above on the gondola, and the peeled piece of the refractory lining is wrapped in a mesh basket and transported downward to be removed. A method for removing the chimney lining .

  According to the present invention, the generation of dust can be suppressed with low noise and the removal work can be performed efficiently and at a low cost with only a peeling tool such as a small cutter or bar without dividing the fireproof lining into a grid.

In the present invention, if the groove is formed so that the area with the stud of the fireproof lining is narrower than the area without the stud, the labor associated with the peeling of the fireproof lining is reduced as much as possible, and the stud and the reinforcing bar are easily removed. it can.
The nearest position of the reinforcing bar of the kerf of the present invention varies depending on the thickness of the lining, the material of the lining, and the like, but a distance of 2.0 to 6.0 cm and its front and rear is practical.

  The reinforcing bars are generally arranged in the vertical direction, but there are also cases where the reinforcing bars are arranged in the horizontal direction. Auxiliary bars are arranged in a direction perpendicular to the reinforcing bars or vertically and horizontally, and when forming the kerf, the auxiliary bars are also cut simultaneously.

  If the fireproof wall is a chimney, a gondola can be raised and lowered in the chimney, the peeling work is performed on the gondola, and the peeled piece of the fireproof lining is hung up and down between the gondola and below it. It is housed in a net cage called “mokko” and transported downward so that dust generation can be suppressed and processing can be performed with low noise. Embodiments of the present invention will be specifically described below with reference to the drawings.

  Example 1 shown in FIGS. 1-5 is an example which applied this invention to the removal of the fireproof lining of the chimney in a thermal power plant. FIG. 1 is an explanatory diagram of a chimney of Example 1, FIG. 2 is a cross-sectional view of a fire-resistant lining of Example 1, FIG. 3 is an explanatory diagram showing a formation position of a kerf of Example 1, and FIG. FIG. 5 is an explanatory view showing the formation of a kerf, and FIG.

  In the first embodiment, as shown in FIG. 1, the gondola 3 is connected to a gondlau inch (not shown) on the ground by a wire rope 4 and suspended in the chimney 1 so as to be lifted and lowered. The wire rope 4 is supported by being changed in direction by a gondola arm 5 at the upper end of the chimney 1 and a turning sheave 6, and is fixed to the ground by a gondro inch and an anchor weight (not shown). Similarly to the gondola 3, the net cage 7 (mocco) carrying the peeled fire-resistant lining is connected to a winch (not shown) on the ground by the wire rope 8, and is suspended above and below the gondola 3 so as to be movable up and down. At the bottom of the chimney 1, a belt conveyor 17 and a crusher 18 for conveying the peeling piece 10d are disposed. Reference numeral 16 denotes a manhole.

  As shown in FIG. 2, the fireproof lining 10 removed in the first embodiment has a plurality of studs 11 protruding from the iron skin 2 by welding, and reinforcing reinforcing bars 12 are welded to the studs 11 to form a composite. Bars are arranged in rows, reinforcing bars 12a are laterally arranged between the studs 11 and welded to the reinforcing bars 12, welded wire nets 12b are attached in a plane, and are bound by the wire 12c, and a refractory material is placed on these. It is formed by spraying. The rows of reinforcing bars 12 are arranged at predetermined intervals along the inner periphery.

  First, the worker H gets on the gondola 3 and cuts the auxiliary bars 12a and the welded wire mesh 12b (not shown) with the cutter 14 as shown in FIGS. Are formed into a small lining 10 a having the stud 11 and a small lining 10 b having no stud 11. Further, the lateral linings 13a are formed for each of the small linings 10a and 10b at appropriate lengths (about 3 to 4 reinforcing bars 12a).

  Next, as shown in FIG. 5A, the worker H peels the small lining 10 b without the stud 11 with a bar 15 (may be a hammer or the like) to a length of about 30 cm and places it on the gondola 3. Although the small lining 10b is wide and has a large peel area, since it does not have the stud 11 and the reinforcing bar 12, it can be peeled with relatively little effort. Similarly, the small lining 10a having the stud 11 is also peeled off by the bar 15 as shown in FIG. At this time, the stud 11 and the reinforcing bar 12 are removed at the same time. However, since the small lining 10a has a narrow width and a small peeling area, it can be easily removed with relatively little effort equivalent to the small lining 10b. In addition, when it is hard to peel, the reinforcing bar 12 is cut | disconnected with the rotary cutter 14 as needed.

The removed peeling piece 10d is temporarily stored on the gondola 3, but when it reaches a certain amount, it is accommodated in the net cage 7 and transported to the ground, thrown from the manhole 16 onto the belt conveyor 17 and conveyed to the crusher 18, and the crusher 18 Crush. The crushed powder 10e is then separated and disposed of into irons and waste lining material. This process is carried out according to the required location, the stud 11 is welded to the removal trace, the reinforcing bar 12 and the auxiliary bar 12a are arranged, the welded wire mesh 12b is attached, and a new refractory material is sprayed to complete the repair.
(Reference example)

Example shown in FIGS. 6 and 7 is a reference example in which on one side nearest position rebar refractory lining cut grooves in Example 1. Figure 6 is an explanatory view showing a forming position kerf of the refractory lining of the reference example, FIG. 7 is an explanatory view showing the separation of the small lining reference example. In the figure, 10c is a small lining.

In the reference example , as shown in FIG. 6, a kerf 13 is formed at a position closest to one side of the reinforcing bar 12 along the reinforcing bar 12 direction. Each of the cut small linings 10c has a stud 11 and a reinforcing bar 12 on the right side, and has a wide area without the stud 11 and the reinforcing bar 12 on the left side. When peeling off, as shown in FIG. 7 (a), the bar 15 is peeled off from the right side, and the remaining stud 11 and the rebar 12 are peeled off as shown in FIG. 7 (b). Work efficiently with little effort .

  The method for removing a refractory lining according to the present invention is applicable not only to the lining of a chimney lining, the refractory wall of a furnace such as a thermal power plant, an ironworks, or an incinerator, but also to the peeling of the outer wall of a building.

It is explanatory drawing of the chimney of Example 1. FIG. 1 is a cross-sectional view of a fireproof lining of Example 1. FIG. It is explanatory drawing which shows the formation position of the kerf of the fireproof lining of Example 1. FIG. It is explanatory drawing which shows formation of the kerf of Example 1. It is explanatory drawing which shows peeling of the small lining of Example 1. FIG. It is explanatory drawing which shows the formation position of the kerf of the fireproof lining of a reference example . It is explanatory drawing which shows peeling of the small lining of a reference example .

DESCRIPTION OF SYMBOLS 1 Chimney 2 Iron skin 3 Gondola 4 Wire rope 5 Gondola arm 6 Turning sheave 7 Net cage 8 Wire rope 10 Fireproof lining 10a, 10b, 10c Small lining 10d Separation piece 10e Crushed powder 11 Stud 12 Reinforcing bar 12a Auxiliary reinforcement 12b Welding wire 12b Wire 13 Cutting groove 13a Horizontal groove 14 Cutter 15 Bar 16 Manhole 17 Belt conveyor 18 Crusher H Worker

Claims (2)

Reinforcing reinforcing bars between multiple studs projecting from the steel wall of the fire wall, arranging double rows of reinforcing bars in the same direction, and covering the reinforcing bars and studs with a certain thickness to cover the reinforcing bars A method for removing a fireproof lining from a formed fire wall, in which a kerf is formed in the position closest to both sides of the reinforcing bar of the fire resistant lining along the reinforcing bar arrangement direction, and the fire resistant lining assists in a direction perpendicular to the reinforcing bar. The reinforcement is arranged, and the auxiliary reinforcement is cut at the same time when the kerf is formed , and the refractory lining is divided into the area with the stud and the area without the stud by the kerf, and the stud with the refractory lining. The refractory lining is removed by forming kerfs so that the areas with stubs are narrower than the areas without studs, and removing each area separately along the direction of the kerfs. Method. The fire wall is a fire wall of the chimney, and a gondola is installed in the chimney so that it can be raised and lowered, and a mesh basket that carries the peeled pieces of the fire-resistant lining that is peeled off is suspended between the gondola and below it so that it can be raised and lowered. The refractory lining is removed on the gondola by the method of removing the refractory lining according to claim 1 and the peeled pieces of the peeled refractory lining are wrapped in a mesh basket and transported downward to be removed. To remove the chimney lining.

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