JP3389175B2 - Joint repair method for building exterior walls - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint repair method for an outer wall of a building for repairing a silicone or non-silicone sealing material filled in a joint groove in the outer wall of the building.

[0002]

2. Description of the Related Art A joint groove in an outer wall of a building or the like is filled with a silicone or non-silicone sealing material to prevent water leakage, and when the sealing material deteriorates with age, the sealing material can be cut with a cutter or the like. Removed and filled with new sealing material.

In Japanese Patent Laid-Open No. 146614/1994, a solvent such as methyl alcohol is applied to the residual thin layer of the sealing material after the cutter is removed and wiped to fill a new sealing material.

[0004]

However, in repairing the sealing material, the existing sealing material is removed by a cutter or the like, but a thin layer of the sealing material that cannot be completely removed remains on the inner surface of the joint groove. It is difficult to avoid, and the residual thin layer of the sealing material is present at the interface between the inner surface of the joint groove and the newly filled sealing material, which causes water leakage at the interface.

In particular, when the existing sealing material is a silicon-based sealing material and the new sealing material is a non-silicon-based sealing material, the two materials lack affinity and the residual thin layer of the silicon-based sealing material and the non-silicon-based sealing material are not present. Adhesion failure will occur at the interface with the sealing material, and water leakage will occur as well.

Further, as in the above-mentioned prior art, the method of applying the solvent to the residual thin layer has the function of swelling the residual thin layer, but does not have the function of dissolving, and the residual thin layer base layer portion remains even after wiping. It is difficult to avoid, and there is a risk that this will intervene at the interface with the newly filled sealing material, resulting in poor adhesion (waterproof flaw).

[0007]

The present invention provides a joint repairing method for a building outer wall that appropriately solves the above problems.

In summary, according to the present invention, after the sealing material filled in the joint groove in the outer wall of the building is removed by a cutter or the like as described above, the sealing material dissolving agent is filled in the joint groove from which the sealing material has been removed. Then, the residual thin layer of the sealing material remaining on the inner surface of the joint groove is promoted to be dissolved, and the joint groove from which the sealing material dissolving agent has been removed is filled with a new sealing material.

As a means for filling the sealant dissolving agent from which the sealant dissolving agent has been filled with the sealant dissolving agent, a gasket is inserted inside the joint groove, and a paste-like or cream-like solid sealing is carried out in the joint groove. Fill with a material dissolving agent and back up with the above gasket.

After being left for a certain period of time to promote the reaction,
The gasket is removed, the sealing material dissolving agent is removed, and the new sealing material is filled.

The gasket has a flexible fold protruding from the shaft portion, and the flexible fold is elastically brought into close contact with the inner surface of the joint groove to define a filling space for the sealant dissolving agent.

As another means for filling the sealing material dissolving agent into the joint groove from which the sealing material has been removed, a liquid retaining material impregnated with the sealing material dissolving agent is inserted into the joint groove from which the sealing material has been removed. Then, the filling is performed, the liquid retaining material is removed to remove the sealing material dissolving agent, and the new sealing material is filled.

For example, as the sealing material dissolving agent, organic
Apply acid.

The joint groove opening surface filled with the sealing material dissolving agent is masked with an adhesive tape or the like to shield the sealing material dissolving agent, thereby curing the sealing material dissolving agent, improving the weather resistance and improving the sealing material dissolving agent. Prevent volatilization.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS. 1A to 1F,
A first embodiment of the present invention will be described.

As shown in FIG. 1A, a joint groove 2 of a building outer wall 1 made of mortar, concrete, panels or the like is filled with a known silicone or non-silicone sealing material 3.

The sealing material 3 is removed by a cutter or the like as shown in FIG. 1B. Further, when removing the sealing material 3, the backup material 4 filled behind the sealing material 3 is also removed. At this time, the residual thin layer 3 ′ of the sealing material 3 that cannot be completely removed by the cutter or the like remains on the inner surface of the joint groove 2.

A gasket 5 as shown in FIG. 1C is inserted into the joint groove 2 in which the residual thin layer 3'is left, and a filling space 2a for the sealing material dissolving agent 6 is defined.

Flexible pleats 5b protruding from the shaft portion 5a are provided on the gasket 5 in a plurality of steps at intervals in the axial direction, and the flexible pleats 5b are elastically attached to the inner surface of the joint groove 2. The space 2a in which the sealing material dissolving agent 6 is closely contacted is defined.

The filling space 2a defined by the gasket 5 is filled with a sealing dissolving agent 6 for dissolving the residual thin layer 3'of the sealing material 3 and backed up by the gasket 5.

The sealant dissolving agent 6 is prepared by diluting an organic acid such as a hydrofluoric acid-based organic acid, preferably a strongly acidic organic acid with a diluent such as toluene, xylene, hexane, etc. to obtain calcium carbonate, feldspar, talc, etc. The above-mentioned filling is performed by kneading with an inorganic filler made of powder as described above to form a cream or paste.

Further, as shown in FIG. 1D, the opening surface of the joint groove 2 is masked to block the sealing material dissolving agent 6.

As a specific example, the opening surface is covered with an elongated synthetic resin cover plate 8a. As means for fixing the cover plate 8a, for example, the shaft portion 5a of the gasket 5 is provided with an engagement groove 5c which is opened at the outer end surface, and the engagement groove 5c is provided so as to project from the central portion of the inner surface of the cover plate 8a. The protrusion 8b is engaged and the gasket 5 and the cover plate 8a are joined.

Elastic ribs 8c projecting inward are provided at both ends in the widthwise direction of the cover plate 8a so as to extend in the longitudinal direction, and the elastic ribs 8c are joined to each other to form the joint groove 2 on the outer wall surface. And the opening surface of the joint groove 2 is masked. Alternatively, the opening surface of the joint groove 2 is masked by a masking tape 8 such as an adhesive tape instead of the cover plate 8a. The masking material shields the sealing material dissolving agent 6 to promote the dissolution of the residual thin layer 3 '.

The masking material is a sealing material dissolving agent 6
The residual thin layer 3'is improved by improving the weather resistance and preventing volatilization.
To act actively.

Next, as shown in FIG. 1E, the gasket 5 is removed, and the sealing material dissolving agent 6 in which the residual thin layer 3 ′ is dissolved by the removal is applied to the flexible fold 5 of the gasket 5.
b is scraped out and removed.

In order to improve the adhesion between the new sealing material 3a and the inner surface of the joint groove 2, the inner surface of the joint groove 2 from which the sealing material dissolving agent 6 has been removed is washed with a cleaning agent.
After washing, a silane-based, synthetic rubber-based, polyurethane-based, or epoxy-based primer is applied to enhance the adhesive strength to the new sealing material 3a.

Next, as shown in FIG. 1F, the joint groove 2 from which the sealing material dissolving agent 6 has been removed is filled with a backup material 4a, and a new sealing material 3a is formed in the joint groove 2 defined by the backup material 4a. Fill. Therefore, the joints on the outer wall 1 of the building are repaired.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2A to 2F.

As shown in FIG. 2A, the joint groove 2 of the building outer wall 1 made of mortar, concrete, and panels is filled with a known silicon-based or non-silicon-based sealing material 3.

As shown in FIG. 2B, this sealing material 3 is removed with a cutter or the like. Further, when removing the sealing material 3, the backup material 4 filled behind the sealing material 3 is also removed. Or the above sealing material 3
Only the above is removed and the backup material 4 is left to back up the liquid retaining material 7 described below.

A residual thin layer 3'of the sealing material 3 which cannot be completely removed by the cutter or the like remains on the inner surface of the joint groove 2.

As shown in FIG. 2C, a liquid retaining material 7 impregnated with the sealing material dissolving agent 6 is filled in the joint groove 2 in which the residual thin layer 3 ′ remains, and is backed up by the backup material 4. As the liquid retaining material 7, a porous porous material having a string shape is applied.

The sealing material dissolving agent 6 is an organic acid such as a hydrofluoric acid-based organic acid, preferably a liquid acid obtained by diluting a strongly acidic organic acid with a diluent such as toluene, xylene or hexane. 7 is impregnated and filled in the joint groove 2 in which the residual thin layer 3 ′ remains.

Alternatively, the above organic acid diluted with a diluent is kneaded with an inorganic filler made of powder such as calcium carbonate, feldspar, and talc to form a cream or paste, which is used as the liquid retaining material 7. It is held in an alternative string-shaped carrier and filled in the joint groove 2.

Next, as shown in FIG. 2D, the opening surface of the joint groove 2 is masked by a masking material such as a masking tape 8 such as an adhesive tape, the sealing material dissolving agent 6 is shielded, and the residual thin layer is removed. It acts on 3 ', and promotes the dissolution of the residual thin layer 3'.

The masking material improves the weather resistance of the sealing material-dissolving agent 6 and prevents volatilization, and the sealing material-dissolving material 6 is allowed to act actively on the residual thin layer 3 '.

Thereafter, as shown in FIG. 2E, the sealing material dissolving agent 6 in which the residual thin layer 3'is dissolved is removed along with the removal of the liquid retaining material 7 or the carrier. The remaining backup material 4 is removed together with the liquid retaining material 7.

In order to improve the adhesion between the new sealing material 3a and the inner surface of the joint groove 2, the inner surface of the joint groove 2 from which the sealing material dissolving agent 6 has been removed is washed with a cleaning agent.
After washing, a silane-based, synthetic rubber-based, polyurethane-based, or epoxy-based primer is applied to enhance the adhesive strength to the new sealing material 3a.

Next, as shown in FIG. 2F, a new sealing material 3a is added to the joint groove 2 from which the sealing material dissolving agent 6 has been removed.
Backup member 4a filled and filled a new sealant 3a eye Graben 2 defined by the backup member 4a against. Therefore, the joints on the outer wall 1 of the building are repaired.

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

As described above, according to the present invention, in the method for repairing joints on the outer wall of the building, the problem of water leakage caused by the residual thin layer of the existing sealing material that cannot be completely removed by the cutter or the like is effectively solved. In addition, a sound repair work can be guaranteed.

Further, regardless of whether the sealing material to be newly filled is a silicone type or a non-silicon type, the adhesion of the new sealing material is good and joint repair can be performed without causing water leakage.

By applying the organic acid, it was possible to effectively achieve the purpose of appropriately removing the residual thin layer, which could not be achieved by the conventional solvent.

[Brief description of drawings]

1A to 1F are cross-sectional views sequentially illustrating a first embodiment of a joint repair method for an outer wall of a building.

2A to 2F are cross-sectional views sequentially illustrating a second embodiment of a joint repairing method for an outer wall of a building.

[Explanation of symbols]

1 building outer wall 2 joint groove 3,3a Sealant 3'remaining thin layer 4,4a Backup material 5 gasket 5a Shaft 5b flexible folds 5c Engagement groove 6 Sealant dissolving agent 7 Liquid retaining material 8a Cover plate 8b Engagement protrusion 8c elastic rib 8 masking tape

Front page continued (72) Inventor Hiroshi Mizukami 4-33-2 Kameido, Koto-ku, Tokyo Within Riken Kogyo Co., Ltd. (72) Kenji Hattori 4-33-2 Kameido, Koto-ku, Tokyo Riken Industrial Co., Ltd. In-house (72) Inventor Shigeo Nanjo 4-13 Hommachi, Chuo-ku, Osaka-shi, Osaka Inside Takenaka Corporation (72) Inventor Akihide Matsui 4-1-1 Hommachi, Chuo-ku, Osaka, Osaka Takenaka Corporation (72) Inventor Ichizo Yoshikawa 4-1-1 Hommachi, Chuo-ku, Osaka-shi, Osaka Inside Takenaka Corporation (72) Inventor Satoru Osawa 4-1-1-13, Honmachi, Chuo-ku, Osaka Incorporated Takenaka Corporation (72) Inventor Shozo Ido 7-17-6 Nishishinjuku, Shinjuku-ku, Tokyo Incorporated company Kipron (72) Inventor Masaaki Murase 7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar Giken Co., Ltd. (72) Inventor Shunsuke Fukatsu 7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar Giken Co., Ltd. (56) References JP-A-7-196963 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1/682 E04F 13/08 E04G 23/02

Claims (5)

(57) [Claims] 1. A sealing material filled in a joint groove in an outer wall of a building is removed by a cutter or the like, and a gasket is inserted in the joint groove inside which the sealing material has been removed.
By filling a sealing material dissolving agent into the joint groove to promote dissolution of a residual thin layer of the sealing material left on the inner surface of the joint groove,
A method for repairing joints on an outer wall of a building, which comprises removing a sealing material dissolving agent that has dissolved the residual thin layer by removing the gasket, and filling a new sealing material into the joint groove from which the sealing material dissolving agent has been removed. 2. The outer wall of the building according to claim 1, wherein the gasket has a flexible fold protruding from a shaft portion, and the flexible fold is elastically brought into close contact with the inner side surface of the joint groove. Joint repair method. 3. The sealing material filled in the joint groove on the outer wall of the building is removed by a cutter or the like, and the joint groove from which the sealing material has been removed is filled with a liquid-retaining material impregnated with a sealing material dissolving agent. To promote the dissolution of the residual thin layer of the sealing material that remains on the inner surface of the gutter, remove the sealing material dissolving agent that has dissolved the residual thin layer by removing the liquid retaining material, and to the joint groove from which the sealing material dissolving agent has been removed. A joint repair method for a building outer wall, which is characterized by filling a new sealing material. 4. The sealing material dissolving agent is shielded by masking the opening surface of the joint groove.
Joint repair method on the exterior wall of the building. 5. The method for repairing joints on an outer wall of a building according to claim 1 or 3, wherein the sealant dissolving agent is an organic acid.