JP2009108600A - Existing roof repairing method and repairing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an existing roof repairing method which dispenses with drilling work etc. even if a projection is present on an existing roof, and improves the strength of the existing roof in a short time, and to provide an existing roof repairing structure. <P>SOLUTION: According to the method, even if the projection is present on the slate roof S, by spraying a fiber-mixed resin formed of fiber pieces 20a, a resin 20b, and a hardener 20c from above, the fiber-mixed resin is bonded onto the slate roof S. Then by pressing the bonded fiber-mixed resin onto the slate roof S, air mixed in the fiber-mixed resin during spraying is released, and thus the fiber-mixed resin is tightly stuck onto the slate roof S. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and a structure for repairing an existing roof, and more particularly to a method and a structure for repairing a roof that has deteriorated over time.

  After the war, only about 3% of asbestos imported into Japan was used for spraying, most of which was used for building materials, of which about 60% was used as material for asbestos slate. Asbestos slate is mainly used on the roofs and outer walls of buildings, and as time passes, the surface deteriorates due to ultraviolet rays and acid rain, and the cement component flows out, and asbestos scatters when touched by hand.

  Conventionally, as a technique for repairing such deteriorated asbestos slate, for example, in Patent Document 1, a thin fiber cloth is laid on an existing asbestos slate roof, and the cloth is laid on the laid cloth. Further apply a waterproof and liquid upper layer resin that can be impregnated, impregnate the cloth with the upper layer resin until it reaches the roof surface on the lower surface of the cloth, and dry the upper layer resin to cure the cloth. A method for repairing an existing roof that improves the strength is described. Since there are protrusions such as bolts for fixing asbestos slate on the roof, holes are formed in the cloth at predetermined intervals, and the protrusions on the roof are inserted into the holes. .

JP 2004-251102 A

  As described above, since there are protrusions such as bolts for fixing asbestos slate on the roof, it is necessary to form a hole through which the protrusions are inserted into the cloth in the above-described conventional repair method, but the position of the bolt is Since it is not standardized, it is necessary to perform this drilling operation for each bolt on site. Therefore, there is a problem that the work takes time.

  Therefore, in the present invention, even if there is a protrusion on the existing roof, a drilling operation or the like is unnecessary, and the existing roof can be improved in a short time, and the existing roof can be improved. The purpose is to provide a structure.

  The method of repairing an existing roof according to the present invention includes a spraying step of spraying a resin in which fiber pieces are mixed on the existing roof (hereinafter referred to as “fiber piece mixed resin”), and the fiber piece mixed resin on the existing roof. A pressing step for pressing.

  According to the method for repairing an existing roof according to the present invention, even if there is a protrusion on the existing roof, the fiber piece mixed resin is adhered to the existing roof by spraying the fiber piece mixed resin from above, and this adhesion is made. By pressing the fiber piece mixed resin onto the existing roof, the air mixed at the time of spraying the fiber piece mixed resin can be extracted, and the fiber piece mixed resin can be brought into close contact with the existing roof. And the repair structure of the existing roof of this invention by which resin with which the fiber piece was mixed was laminated | stacked on the existing roof because this fiber piece mixed resin hardens | cured.

  Here, the spraying step is performed by a spray device that discharges the continuously supplied fibers while cutting them into a predetermined length and making them into fiber pieces, and jets the resin and the catalyst toward the discharged fiber pieces, respectively. It is desirable. According to such a spray device, it is not necessary to prepare a fiber fragment mixed resin in advance before the spraying operation, and the fibers are cut by the amount necessary for spraying and mixed in the air together with the resin and the catalyst and sprayed onto the existing roof. It is done.

  The length of the fiber pieces is desirably 1 cm (about 1/2 inch) to 5 (about 2 inches) cm. If it is a fiber piece of 1 to 5 cm, the direction of the fiber piece becomes irregular when it is sprayed on the existing roof and is intertwined with each other, so that the strength after curing of the resin becomes extremely high. In addition, when it is less than 1 cm, there is too little entanglement of the fiber pieces, and the strength after resin curing may be insufficient. In the case of more than 5 cm, the fiber pieces are too long when sprayed on the existing roof, and are difficult to adhere in a planar manner.

  The mixing weight ratio of the fiber piece and the resin is preferably 1: 5 to 1: 2. If the mixing weight ratio of the fiber piece and the resin is 1: 5 to 1: 2, the fiber piece and the resin mix well and the strength after curing becomes the highest. In addition, when there are less fiber pieces than 1: 5, the reinforcement | strengthening effect by a fiber piece is not acquired so much. On the other hand, when there are more fiber pieces than 1: 2, since there are too many fiber pieces with respect to resin and it becomes difficult to adapt resin and fiber pieces, the intensity | strength after hardening becomes weak.

(1) Even if there is a protrusion on the existing roof by the step of spraying the fiber piece mixed resin on the existing roof and the step of pressing the sprayed fiber piece mixed resin on the existing roof, The fiber piece mixed resin can be brought into close contact with the existing roof and hardened, and a repair structure of the existing roof in which the fiber piece mixed resin is laminated on the existing roof is obtained. Thereby, even if there is a protrusion on the existing roof, drilling work or the like is unnecessary, and the strength of the existing roof can be improved in a short time.

(2) The spraying process is performed by a spray device that cuts the continuously supplied fibers into a predetermined length and discharges the fibers and discharges the resin and the catalyst toward the discharged fiber pieces. Thus, it is not necessary to prepare the resin piece mixed fibers in advance before the spraying operation, and the fiber piece mixed resin is supplied in an amount necessary for the spraying, so that wasteful consumption of materials can be prevented. In addition, since the resin and the catalyst are mixed in the air, only the amount discharged onto the existing roof is cured quickly by the action of the catalyst, so that the spray device can be easily maintained.

(3) Since the length of the fiber pieces is 1 to 5 cm, the orientation of the fiber pieces becomes irregular and entangled with each other when sprayed on the existing roof, so that the strength after resin curing is extremely high. Renovation structure of high existing roof can be obtained.

(4) When the mixing weight ratio of the fiber piece and the resin is 1: 5 to 1: 2, the repaired structure of the existing roof having the highest strength after curing is obtained by mixing the fiber piece and the resin well. .

  FIG. 1 is a flowchart of an existing roof renovation method according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a repair structure formed on the existing roof. In the following explanation, slate roofs containing asbestos are taken as an example of existing roofs to be repaired, but this method is applied to roofs made of slate that does not contain asbestos, fiber reinforced cement boards, metal, plastic, tiles, wood, etc. It is also possible to do.

As shown in FIG. 1, in the repair method of the existing roof in the embodiment of the present invention, first, in step S100, the water leaking portion of the slate roof S is repaired, and large dust, moss and the like are removed with a vacuum cleaner. The reason for removing it with a vacuum cleaner is to prevent scattering of asbestos. Next, in step S101, a primer (undercoat) 1 (see FIG. 2) is applied on the slate roof S. Here, the application amount of the primer 1 is 0.15 to 0.5 kg / m ² . The primer 1 penetrates into the aged slate roof S, hardens the mold and dust on the surface together, and regenerates the adhesive strength of the asbestos slate surface like a new one.

  Next, in step S102, the fiber piece mixed resin 2 is sprayed. FIG. 3 is a schematic diagram of spraying the fiber piece mixed resin 2. As shown in FIG. 3, the spray device 10 used for spraying the fiber piece mixed resin 2 cuts glass fiber 20 continuously supplied by a roll (not shown) into a predetermined length by a cutter unit 11. The fiber 20a is discharged while being about 2.54 cm (1 inch), and the resin 20b and the curing agent 20c as a catalyst are ejected toward the discharged fiber 20a.

At this time, the resin 20b and the curing agent 20c are supplied by the hoses 30 and 40, respectively. In the present embodiment, the mixing weight ratio between the fiber piece 20a and the resin 20b is set to 1: 3. The spray device 10 is supplied with compressed air by a hose 50 connected to a compressor (not shown), and the fiber pieces 20a, the resin 20b and the curing agent 20c are discharged or ejected by the compressed air. The The coating amount of the fiber piece 20a is 0.25 to 0.54 kg / m ² , and the coating amount of the resin 20b is 0.63 to 1.638 kg / m ² .

In step S103, the fiber piece mixed resin 2 is pressed onto the slate roof S by a roller 60 (see FIG. 4), and the air mixed when the fiber piece mixed resin 2 is sprayed is extracted (defoamed) to mix the fiber pieces. The resin 2 is brought into close contact with the slate roof S. After the fiber piece mixed resin 2 is cured, it is coated with the top coat 3 in step S104 to protect the fiber piece mixed resin 2. The amount of top coat 3 applied is set to 0.405 kg / cm ^{2 to} 0.81 kg / cm ² .

  As described above, in the repair method for the existing roof in the present embodiment, the fiber piece mixed resin 2 is adhered on the slate roof S by spraying the fiber piece mixed resin 2, and the adhered fiber piece mixed resin 2 is attached to the slate roof. By pressing on S, the air mixed at the time of spraying the fiber piece mixed resin 2 is extracted, and the fiber piece mixed resin 2 is brought into close contact with the slate roof S. When the fiber piece mixed resin 2 is cured, the modified structure of FIG. 2 in which the reinforcing layer of the fiber piece mixed resin 2 is laminated on the slate roof S is formed.

  Thus, in the repair method of the existing roof in this embodiment, since the fiber piece mixed resin reinforcement | strengthening layer is formed by spraying the fiber piece mixed resin 2, it is a case where protrusions, such as a volt | bolt, exist on an existing roof. Even if it exists, it can be easily constructed in a short time without performing on-site processing such as drilling. The shape of the existing roof can also be applied to various shapes such as corrugated slate, folded plates and tiles. Further, since no high-pressure cleaning or drilling operation of the slate roof S is required, there is no scattering of asbestos dust.

  Moreover, in this existing roof refurbishing method, the spraying process is performed by cutting continuously supplied fibers into a predetermined length and discharging into fiber pieces 20a, and resin 20b toward the discharged fiber pieces 20a. And the spray device 10 for ejecting the curing agent 20c. Therefore, it is not necessary to prepare the resin piece mixed fibers 2 in advance before the spraying operation, and the fiber piece mixed resin 2 is supplied from the spray device 10 as much as necessary for spraying, thereby preventing wasteful consumption of materials. Can do. Further, in this spray device 10, since the resin 20b and the curing agent 20c are mixed in the air, only the amount discharged onto the slate roof S is cured quickly by the action of the curing agent 20c. Easy.

  Moreover, in the repair method of the existing roof in this embodiment, since the length of the fiber piece 20a is about 2.54 cm, when the fiber piece 20a is sprayed on the slate roof S, the direction of the fiber piece 20a becomes irregular and entangles with each other. Therefore, the strength after curing the fiber piece mixed resin 2 becomes extremely high. The length of the fiber piece 20a can be selected in the range of 1 cm (about 1/2 inch) to 3 cm (about 2 inches), but is set beyond this range depending on the required strength. It is also possible.

  Moreover, in the repair method of the existing roof in this embodiment, since the mixing weight ratio of the fiber piece 20a and the resin 20b is 1: 3, the fiber piece 20a and the resin 20b mix well and the strength after hardening is the most. It will be expensive. The mixing weight ratio between the fiber piece 20a and the resin 20b can be set in a range of 1: 5 to 1: 2.

  The strength test before and after the construction of the repair method for the existing roof in the above embodiment was performed. A fiber reinforced cement corrugated sheet was used as a test material, and a bending test and an impact test were performed according to Japanese Industrial Standard (JIS) A1408 (bending and impact test method for building boards). The sample size is 500 mm × 400 mm (No. 3).

  As a result of the impact resistance test, cracks occurred in two of the three sheets that were not yet applied, whereas no damage was observed in all three sheets after the application. Moreover, as a result of the bending strength test, the untreated one was 452.0 kg, while the post-constructed one was 687.0 kg. FIG. 5 shows the bending strength test result for the untreated one, and FIG. 6 shows the bending strength test result for the one after the construction.

  As a result of these tests, it was confirmed that the repair method for the existing roof in the above embodiment had a very excellent reinforcing effect.

  The method and structure for repairing an existing roof of the present invention are useful as a method and structure for repairing a roof that has deteriorated over time. In particular, it is suitable as a method and structure for repairing asbestos slate using asbestos.

It is a flowchart of the repair method of the existing roof in embodiment of this invention. It is sectional drawing of the repair structure formed on the existing roof. It is a schematic diagram of spraying of fiber piece mixed resin. It is a schematic diagram of pressing of the fiber piece mixed resin by a roller. It is a figure which shows the bending strength test result about the non-construction thing of the repair method of the existing roof in embodiment of this invention. It is a figure which shows the bending strength test result about the thing after construction of the repair method of the existing roof in embodiment of this invention.

Explanation of symbols

S Slate roof 1 Primer 2 Fiber piece mixed resin 3 Top coat 10 Spray device 11 Cutter part 20 Glass fiber 20a Fiber piece 20b Resin 20c Curing agent 30, 40, 50 Hose 60 Roller

Claims (5)

A spraying step of spraying a resin in which fiber pieces are mixed on an existing roof (hereinafter referred to as “fiber piece mixed resin”);
A method of repairing an existing roof, comprising a pressing step of pressing the fiber piece mixed resin onto the existing roof.   The spraying step is performed by a spray device that cuts continuously supplied fibers into a predetermined length and discharges the fibers while discharging resin and catalyst toward the discharged fiber pieces, respectively. The method for repairing an existing roof according to claim 1.   The length of the said fiber piece is 1-5 cm, The repair method of the existing roof of Claim 1 or 2.   The method for repairing an existing roof according to any one of claims 1 to 3, wherein a mixing weight ratio of the fiber pieces and the resin is 1: 5 to 1: 2.   Renovation structure of an existing roof in which a resin mixed with fiber pieces is laminated on the existing roof.

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