JP2009249808A - Demolition method for hollow tower-like structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a demolition method for a hollow tower-like structure which can prevent harmful substances from being scattered by a filling failure even if an inorganic curable fluid or the like is not sufficiently filled although a scattering covering layer with a moderate thickness for covering the harmful substances with the inorganic curable fluid such as mortar is formed. <P>SOLUTION: A tubular form 3 is installed in the hollow tower-like structure (chimney) 1 wherein the harmful substances exist on an inner peripheral surface; the inorganic curable fluid 9 is filled into a space between the tubular form 3 and the hollow tower-like structure 1; and after the curing of the inorganic curable fluid 9, the hollow tower-like structure 1 including the tubular form 3 is cut in round slices in a circumferential direction. A plurality of injection holes 10 are formed in estimated cutting positions, respectively; a fire-resistant lining material 2 is impregnated with an immersion solidification agent 11 which is injected from the injection holes, and after the solidification of the immersion solidification agent, they are cut in round slices. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides, for example, a chimney in which asbestos (asbestos) is used as a fireproof lining material on the inner peripheral surface, and a chimney in which dioxin is attached to the inner peripheral surface or fireproof lining material. The present invention relates to a method for dismantling a hollow tower structure in which harmful substances are present on the surface.

  Filling the inside of a hollow tower structure with harmful substances such as asbestos and dioxin on the inner peripheral surface, and carrying out curing curing of the harmful substances, the hollow tower structure is transformed into a wire saw, etc. A method for disassembling a hollow tower structure in which harmful substances such as asbestos and dioxin are not scattered when cutting into a ring shape is already known from Patent Documents 1 and 2.

  The method for disassembling the hollow tower structure described in Patent Document 1 is to fill the interior of the hollow tower structure with foamable polyurethane, foamable polystyrene, foam mortar, etc. This is a method of cutting a structure into a ring shape together with a foam-cured filler.

  In the method for disassembling the hollow tower structure described in Patent Document 2, an air tube in a contracted state is inserted into the hollow tower structure, and the air tube is expanded to be concentric inside the hollow tower structure. After fixing to a shape, the space between the hollow tower structure and the air tube is filled with a foaming agent (an organic foam material that becomes urethane foam or polystyrene), and after the foaming agent is foam-cured, the air tube is shrunk. Then, the hollow tower-like structure is cut into a ring shape together with the foaming agent that has been foam-cured.

  These dismantling methods include a method of forming a sealed space around the hollow tower structure and disassembling the hollow tower structure in the sealed space, or cleaning the harmful substances inside the hollow tower structure with high-pressure water. Compared with the dismantling method that removes in advance, there are many advantages such as no work in a dust environment containing harmful substances and less risk of leakage of harmful substances to the surroundings. Excellent safety from the viewpoint of exposure.

  However, some problems have been pointed out in these dismantling methods. For example, as seen in Patent Documents 1 and 2, when an organic foamed material such as foamable polyurethane or foamable polystyrene is used as the curable fluid to be filled in the hollow tower-like structure, it is caused by foam solidification. There is a risk of ignition due to self-heating, sparks during cutting or frictional heat.

  As a means for avoiding such inconvenience, it is conceivable to use an inorganic curable fluid such as mortar instead of the organic foam material. However, in the method of completely filling the inside of the hollow tower structure as in Patent Document 1, if an inorganic curable fluid such as mortar is used, the weight ratio of the packing to the structure housing becomes too large, and the ring is cut. There is a high possibility that the stuff will fall off and the harmful substances will be scattered while the structure piece cut into a shape is carried out.

  In this regard, as in Patent Document 2, if it is a method of filling the space between the hollow tower structure and the air tube, the scattering curing layer by the packing is thinned to the minimum necessary, and the structure of the packing The weight ratio with respect to the housing can be kept below a certain level. On the other hand, in this method, it is difficult to densely place an inorganic curable fluid such as mortar so that no voids are generated in the interior of the hollow columnar structure as compared with the case where the entire structure is filled. Often results in poor filling. If there is poor packing, when the hollow tower-like structure is cut into a circular shape together with the packing, there is a high possibility that harmful substances in the defective packing will be exposed and scattered outside.

  Moreover, in any dismantling method of patent documents 1 and 2, when a hollow tower-like structure is cut into a circular shape together with the packing, harmful substances may be scattered from the cut surface of the refractory lining material.

Japanese Patent Application Laid-Open No. 8-120953 JP 2003-343827 A

  The present invention has been made in consideration of the above points, and the main purpose thereof is a scattering curing layer having an appropriate thickness that covers harmful substances with an inorganic curable fluid such as mortar. It is an object of the present invention to provide a method for dismantling a hollow tower structure that can prevent scattering of harmful substances caused by poor packing even if defective packing occurs. Another object of the present invention is to prevent harmful substances from scattering from the cut surface of the refractory lining material when the hollow tower-like structure is cut into a ring shape.

  The technical means taken by the present invention in order to achieve the above object are as follows. That is, in the method for disassembling a hollow tower structure according to the first aspect of the present invention, a cylindrical formwork is installed inside a hollow tower structure in which harmful substances are present on the inner peripheral surface. Filling the space between the hollow columnar structure with an inorganic curable fluid, and after curing the inorganic curable fluid, cutting the hollow columnar structure together with the cylindrical formwork in the circumferential direction. It is a feature.

  A method for disassembling a hollow tower structure according to the invention described in claim 2 is the dismantling method for a hollow tower structure according to claim 1, wherein the hollow tower structure is circumferentially moved from the outside of the hollow tower structure to a planned cutting position. A plurality of injection holes are formed at appropriate intervals, and the immersion solidifying agent injected from these injection holes is impregnated into the refractory lining material on the inner peripheral surface of the hollow tower structure and solidified. The tower-like structure is cut in the circumferential direction together with the cylindrical formwork.

  According to invention of Claim 1, a cylindrical formwork is installed in the inside of a hollow tower-like structure, and an inorganic type curable fluid is put in the space between a cylindrical formwork and a hollow tower-like structure. Since it fills, the scattering curing layer of the moderate thickness which coat | covers a hazardous | toxic substance with inorganic type curable fluids, such as mortar, can be formed. Moreover, since a hollow tower-like structure is cut | disconnected in the circumferential direction with a cylindrical formwork, a cylindrical formwork becomes a reinforcing material of a scattering curing layer, and can prevent peeling of a scattering curing layer at the time of a cutting | disconnection.

  In particular, since the hollow tower-like structure is cut in the circumferential direction together with the cylindrical formwork, even if the inorganic curable fluid is poorly filled, the poor filling will occur when the hollow tower-like structure is cut into a round shape. Since the part is covered with the cylindrical formwork and the fail-safe effect is exhibited, it is possible to prevent scattering of harmful substances due to poor filling.

  According to invention of Claim 2, in addition to said effect, when cutting a hollow tower-like structure in a ring shape, it can be surely prevented that harmful substances are scattered from the cut surface of the refractory lining material. effective. That is, a plurality of injection holes are formed at appropriate intervals in the circumferential direction at the planned cutting position of the hollow tower structure, and the immersion solidifying agent injected from these injection holes is supplied to the inner peripheral surface of the hollow tower structure. After impregnating the refractory lining material and solidifying it, the hollow tower-like structure is cut into round shapes, so the wire saw that cuts the hollow tower-like structure is wider than the thickness of the wire saw by the immersion solidifying agent. The center portion of the refractory lining material solidified in a ring shape is cut and advanced so that no harmful substances are scattered from the cut surface of the refractory lining material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 6 show an example of a method for disassembling a hollow tower structure according to the present invention. In FIG. 1A, reference numeral 1 denotes a reinforced concrete chimney as a hollow tower-like structure, and a fireproof lining material 2 made of asbestos as a harmful substance is provided on the inner peripheral surface.

  In disassembling such a chimney (hollow tower-like structure) 1, first, as shown in FIG. 1 (B), inside the chimney 1 is a cylindrical mold having a circular cross section composed of a paper void, a spiral iron pipe, and the like. A frame (cylindrical driving form) 3 is installed concentrically.

  As shown in FIG. 2A, the lower end of the cylindrical mold 3 is fixed by a mold fixing mortar 5 poured from the lower flue opening 4, and in the subsequent steps, the cylindrical mold 3 is fixed. It is made not to move unexpectedly and to prevent the inorganic curable fluid for scattering curing from flowing into the inside of the cylindrical mold 3.

  Next, as shown in FIG. 2 (B), a ring-shaped bowl 6 for receiving cooling / curing water at the time of cutting on the outer periphery of the chimney 1 at an appropriate height (for example, a height of about 1000 mm from the bottom). And a tank 7 for collecting cooling / curing water contained in the tub 6 is installed on the ground near the chimney 1, and an opening other than the uppermost part of the chimney 1 such as the lower flue opening 4 is provided with an appropriate lid 8. Block with.

  In this state, as shown in FIG. 3A, an inorganic curable fluid 9 such as mortar is placed in the space between the refractory lining material 2 of the chimney 1 and the cylindrical mold 3 from the upper end of the chimney 1. Fill.

  Thereafter, at an appropriate time, for example, after the scattering curing layer is formed by curing the inorganic curable fluid 9, the outer periphery of the chimney 1 is moved to the planned cutting position as shown in FIG. A plurality of injection holes 10 are formed at appropriate intervals in the direction, and the immersion solidifying agent 11 injected from these injection holes 10 is impregnated into the refractory lining material 2 on the inner peripheral surface of the chimney 1 to be solidified.

  After the refractory lining material 2 is solidified into a ring shape having a predetermined vertical width (a width wider than the thickness of the wire saw 12 described later, for example, about 10 to 20 mm), (A), (B ), The chimney 1 is cut together with the cylindrical formwork 3 into a ring shape of a desired length in the circumferential direction by the wire saw 12. This cutting is performed while spraying cooling / curing water on the outer peripheral surface of the chimney 1. Cooling / curing water containing harmful substances by cutting flows along the outer peripheral surface of the chimney 1 and flows into the tank 6 and is collected in the tank 7. Cooling / curing water flowing down the inside of the chimney 1 is received by the mold fixing mortar 5 and appropriately drained by a drain pump (not shown) and collected in the tank 7.

  In this case, since the chimney 1 is cut together with the cylindrical mold 3 in a ring shape, the cylindrical mold 3 serves as a reinforcing material for the scattering curing layer by the inorganic curable fluid 9, and the scattering curing layer at the time of cutting It can prevent peeling off. In addition, since the chimney 1 is cut into a circular shape together with the cylindrical formwork 3, even if a poor filling of the inorganic curable fluid 9 occurs, when the chimney 1 is cut into a circular shape, the defective filling portion is a cylindrical shape. Since it is covered with the frame 3 and the fail-safe effect is exhibited, it is possible to prevent scattering of harmful substances due to poor filling.

  Moreover, as shown in FIG. 4 (B), the wire saw 12 cuts the central portion of the fire-resistant lining material 2 solidified into a ring shape having a vertical width larger than the thickness of the wire saw by the immersion solidifying agent 11. As shown in FIGS. 5A and 5B, the cut surface of the refractory lining material 2 is impregnated with the immersion solidifying agent 11 and solidified, so that the refractory lining material 2 is cut. No harmful substances such as asbestos are scattered from the surface. As the immersion solidifying agent 11, for example, an inorganic water-based product name: Asseal Sil (manufactured by Kikusui Chemical Co., Ltd.), a synthetic resin-based product name: AR sealer (manufactured by ABC Sea Trading Company), or the like can be used.

  As shown to (A) of FIG. 6, the cut piece is sealed and cured with the sheet | seat 13, and it is carried out toward a special management disposal disposal site in this state. As the sheet 13, it is desirable to use a thick polyethylene sheet (for example, a thickness of about 0.15 mm). Moreover, in order to ensure sealing, it is desirable to adhere | attach the joining part and sheet | seat edge part of sheets with an adhesive tape.

  Then, as shown in FIG. 6 (B), the inner peripheral surface is repeated by repeating the steps after FIG. 3 (B) such as drilling of the injection hole 10 at the next scheduled cutting position and injection of the immersion solidifying agent 11. The chimney 1 in which harmful substances are present is dismantled.

  As mentioned above, although embodiment of this invention was described, this invention should not be limited to embodiment mentioned above. For example, in the embodiment described above, after the inorganic curable fluid 9 is cured, the injection hole 10 is drilled at the planned cutting position of the chimney 1, while the inorganic curable fluid 9 is not yet solidified. An injection hole 10 may be formed. In the above-described embodiment, after the chimney 1 is cut into a ring shape, the injection hole 10 is drilled to the next scheduled cutting position and the immersion solidifying agent 11 is injected. Prior to this, the injection hole 10 may be drilled at the entire or a plurality of stages of scheduled cutting positions, and the immersion solidifying agent 11 may be injected.

It is the cross-sectional top view and longitudinal cross-sectional side view explaining the dismantling method of the hollow tower-shaped structure which concerns on this invention. FIG. 2 is a transverse plan view and a longitudinal side view following FIG. 1. FIG. 3 is a transverse plan view and a longitudinal side view following FIG. 2. FIG. 4 is a partially cutaway side view and a main part enlarged vertical side view following FIG. 3. FIG. 5 is a longitudinal side view and a main part enlarged longitudinal side view following FIG. 4. It is a vertical side view following FIG.

Explanation of symbols

1 Hollow tower structure (chimney)
2 Fire-resistant lining material 3 Tubular mold 4 Lower flue opening 5 Mold fixing mortar 6 ７ 7 Tank 8 Lid 9 Inorganic curable fluid 10 Injection hole 11 Immersion solidifying agent 12 Wire saw 13 Sheet

Claims (2)

  A cylindrical mold is installed inside the hollow tower structure where harmful substances are present on the inner peripheral surface, and the space between the cylindrical mold and the hollow tower structure is filled with an inorganic curable fluid. A method for disassembling a hollow tower-like structure characterized in that after the inorganic curable fluid is cured, the hollow tower-like structure is cut in the circumferential direction together with the cylindrical formwork.   A method for disassembling a hollow tower structure according to claim 1, wherein a plurality of injection holes are formed at appropriate intervals in the circumferential direction from the outside of the hollow tower structure to a planned cutting position. The impregnated solidifying agent injected from the injection hole is impregnated into a fire-resistant lining material on the inner peripheral surface of the hollow tower-shaped structure and solidified, and then the hollow tower-shaped structure is cut in the circumferential direction together with the cylindrical formwork. A method for dismantling a hollow tower structure.

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