JP2005299367A - Crack repairing method of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crack repairing method for a structure in which a repairing position is inconspicuous and the beautiful appearance of the structure can be kept desirable while preventing cracks on the surface of a sealing material even if movements such as vibration or the like generate. <P>SOLUTION: On the upper face of a crack generated in a structure such as a building external wall, a groove 2 having a certain width is formed along the crack. A vertical hole 3 having a larger diameter than the groove width is drilled. The rotary cutter blade that the shaft is smaller than the width of the groove 2 and the diameter is larger than the groove width is inserted from the vertical hole 3 and moves the rotary shaft along the groove 2. Thereby, a lateral hole 4 is formed at the lower side of the groove 2. Thereafter, an elastic sealing material such as a urethane system, and a silicone system is filled in the lateral groove 4 and the groove 2, after the sealing material is cured, the surface of the sealing material protruding to the surface of the groove 2 is finished by skin adhesion of the color of the surrounding external wall 1, the material feeling, etc. by use of an elastic putty or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for repairing a crack in a structure for repairing a crack such as a crack generated on an outer wall of a building made of reinforced concrete or the like, a paved road made of asphalt, concrete or the like.

  In a reinforced concrete building, when the number of days elapses after building, cracks such as cracks occur on the outer wall due to earthquakes or secular changes. If such a crack is left as it is, rainwater or the like invades from the crack, the reinforcing bar is corroded, the crack expands, and the mechanical strength of the building deteriorates rapidly. Therefore, various crack repair methods have been conventionally employed.

  For example, there is a method in which a fine elastic filler, an elastic resin, or the like is rubbed into a gap between cracks or applied using a brush or the like. There is also a method of injecting epoxy resin or the like into the crack using a special method. However, even if repairs are made by these methods, the mouth of a crack is likely to open due to vibration or the like, and this is not an effective measure.

  Therefore, as shown in FIG. 6 (a), there is a crack repairing method in which an elastic sealing material 6 such as urethane resin is applied to the upper surface of the crack 5 formed in the outer wall 1 to complete the repair. Often adopted. By doing so, it is possible to prevent the crack from opening by absorbing it with the sealing material 6 that is thick and elastic even if a movement that tends to shift to both sides of the cracked part due to vibration or the like occurs.

  Further, as shown in FIG. 6 (b), a V-shaped groove (or U-shaped groove) 7 is formed along the crack 5 formed in the outer wall 1, and after the primary treatment, an elastic sealing material such as urethane resin. Several methods for repairing cracks have been proposed in which after the sealing material 6 is cured and the sealing material 6 is cured, the skin is aligned with the surrounding walls by spraying or the like to complete the repair. By doing so, even if a deviation occurs on both sides of the cracked portion, it is absorbed by the sealing material 6 in the V-shaped groove 7 and no crack is generated on the surface.

The following documents are related to such a method for repairing a crack in a structure.
Japanese Patent Laid-Open No. 61-183666 JP 6-2111456 A

  However, among the conventional methods for repairing cracks in the structure, the method of applying the elastic sealing material 6 to the upper surface of the crack 5 thickly makes the repaired parts conspicuous and impairs the aesthetics of the building. There was a problem.

  Further, in the method of forming the V-shaped groove (or U-shaped groove) 7 and filling the sealing material 6 with elasticity therein, the width of the opening of the V-shaped groove 7 is increased, In addition, the work of aligning the skin is difficult and time-consuming, and the sealing material 6 filled in the V-shaped groove 7 is thinned over the years, leaving a streak-like repair mark.

  In view of such problems, the present invention maintains good aesthetics of the building without conspicuous repair sites while preventing cracks from occurring on the surface of the sealing material even if vibrations occur in the cracked portion. The purpose is to make it fall.

  In order to solve the above-described problem, the method of repairing a crack in a structure according to claim 1 includes a step of forming a groove having a constant width along the crack on the upper surface of the crack generated in the structure, A step of drilling a hole having a diameter larger than the groove width, and inserting a rotary cutting blade having a rotation axis smaller than the groove width and a diameter larger than the groove width from the hole, and moving the rotation axis along the groove Thus, the method includes a step of forming a horizontal hole below the groove, and a step of filling a sealing material in the horizontal hole and the groove.

  Further, the method of repairing a crack in a structure according to claim 2 includes a step of forming a groove having a constant width along the crack on the upper surface of the crack generated in the structure, and a rotating shaft having a diameter smaller than the width of the groove. Is pressed from above the groove while rotating a rotary cutting blade larger than the groove width, and a hole having a diameter larger than the groove width is drilled, and then the rotating shaft is moved along the groove, thereby lowering the groove. The method includes a step of forming a lateral hole on the side, and a step of filling a sealing material into the lateral hole and the groove.

  According to a third aspect of the present invention, there is provided a method for repairing a crack in a structure in which a small-diameter cutting blade and a large-diameter cutting blade are placed on a rotating shaft on the crack, and the latter is positioned on the tip side. Forming a side hole below the groove by moving the rotary shaft along the crack after pressing the rotary cutting blade attached to the hole until the large-diameter cutting blade is completely penetrated. And a step of filling the lateral hole and the groove with a sealing material.

  Since this invention is comprised as mentioned above, there exists an effect as described below.

  That is, in the method for repairing a crack in a structure according to claim 1, since a lateral hole is formed below the groove and a sealing material is filled therein, even if vibration or the like occurs in the cracked portion, the sealing is performed. No cracks occur on the surface of the material. In addition, since the portion appearing on the surface of the outer wall is only a trace of a groove having a narrow width, the skin alignment work is easy and the repair trace is not conspicuous.

  Further, in the crack repairing method for a structure according to claim 2, the rotating shaft is smaller than the width of the groove, and the diameter is larger than the groove width by pressing from above the groove while rotating the rotary cutting blade whose diameter is larger than the groove width. Since the rotary shaft is moved along the groove after the pit hole is drilled, the pit hole and the horizontal hole can be formed in one step using a single rotary cutting blade, and the work efficiency is improved accordingly.

  According to a third aspect of the present invention, there is provided a method for repairing a crack in a structure, wherein a small-sized cutting blade and a large-sized cutting blade are placed on a rotating shaft on the crack on the outer wall of the building, and the latter is positioned on the tip side. The rotary cutting blade attached to the cylinder was directly pressed to make a hole until the large-diameter cutting blade was completely inserted, and then the rotary shaft was moved along the crack, so one rotary cutting blade was used. Grooves, potholes, and horizontal holes can be formed in a single process, further improving work efficiency.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The crack repairing method of the present invention forms a groove 2 having a small width along the crack 5 on the wall surface of the outer wall 1 of the building where the crack 5 has occurred, as shown in the sectional view of the repaired building outer wall in FIG. Then, a lateral hole 4 having a large width is formed on the lower side thereof, and an elastic sealing material 6 such as urethane resin is filled in the lateral hole 4 and the groove 2. The grooves 2 and the lateral holes 4 are formed as follows.

  FIG. 2 is a view of the repaired portion as viewed from the upper side of the wall surface. The reference numerals correspond to those in FIG. First, the groove 2 is provided along the crack 5, and a hole 3 having a large diameter is formed on the groove 2, and a cutting tool is inserted from there to form a wide lateral hole 4 below the groove 2.

  Specifically, as shown in FIG. 3, first, using the electric cutter 10 with the diamond blade 12 attached to the tip of the rotating shaft 11, along the crack formed in the wall surface 1, A groove having a width slightly larger than the diameter, for example, a groove 2 having a width of about 2 mm and a depth of about 8 mm is formed.

  Next, using the electric cutter 10 in which the diamond blade 12 is replaced with a larger one, a large diameter hole 3 having a diameter of about 10 mm and a depth of about 10 mm is formed on the groove 2. At this time, when the length of the crack 5 is long, a plurality of pit holes 3 may be provided at a certain interval (for example, about 300 mm).

  Next, the blade of the electric cutter 10 is replaced with a diamond blade 13 having a diameter slightly smaller than the diameter of the hole 3, the diamond blade 13 is inserted into the hole 3, and the rotary shaft 11 is moved along the groove 2. And as shown in FIG. 4, the tunnel-shaped side hole 4 is dug under the groove | channel 2 by moving the diamond blade 13 to a groove | channel longitudinal direction.

  When the horizontal hole 4 is dug, the digging waste is removed using air or the like, and primer treatment is performed using a spray or a brush. Thereafter, an elastic sealing material 6 such as urethane or silicone is filled in the lateral hole 4 and the groove 2. Further, when the sealing material 6 is cured, the surface of the sealing material 6 exposed on the surface of the groove 2 is finished using the elastic putty or the like with the color, texture, etc. of the peripheral outer wall 1 as a skin.

  In this way, since the horizontal hole 4 is formed below the groove 2 and the sealing material 6 is filled therein, even if a movement that tends to shift to both sides of the cracked portion due to vibration or the like occurs. No cracks occur on the surface of the sealing material. In addition, since the portion appearing on the surface of the outer wall 1 is only the trace of the groove 2 having a narrow width, the skin alignment work is easy and the repair trace is not conspicuous.

  In the above embodiment, the horizontal hole 4 is formed through three steps such as the formation of the groove 2, the formation of the coffin hole 3, and the formation of the horizontal hole 4. However, the formation of the coffin hole 3 and the formation of the horizontal hole 4 are performed in one step. You can also. That is, after forming the groove 2 as shown in FIG. 3, the blade of the electric cutter 10 is replaced with a diamond blade 13 as shown in FIG. 4 and pressed from above the groove 2 while rotating the rotary cutting blade. After drilling a pothole having a diameter larger than the width, the rotating shaft 11 is moved along the groove 2 as it is. If it does in that way, the hole 3 and the horizontal hole 4 can be formed in one process using the one diamond blade 13, and work efficiency will improve by that much.

  Further, the formation of the groove 2, the hole 3 and the lateral hole 4 can be formed in one step. That is, from the top of the crack generated in the outer wall of the building, the blade of the electric cutter 10 is directly pressed while rotating to make the hole 3 and moved along the crack as it is to form the groove 2 and the horizontal hole 4. At that time, in order to be able to move along the crack while cutting the groove 2, the rotating shaft 11 of the electric cutter 10 is thinly formed in addition to the diamond blade 13 for forming the lateral hole 4 as shown in FIG. 5. A diamond blade 14 having a diameter is provided on the base side.

  Then, the diamond blade 13 is pressed directly onto the crack while rotating the rotating shaft 11, and a hole is made until the diamond blade 13 completely enters the wall surface, and then the rotating shaft 11 is moved along the crack. As a result, the lateral hole 4 can be formed by the diamond blade 13 while the groove 2 is cut by the diamond blade 14 and the movement path of the rotating shaft 11 is secured. If it does in this way, without exchanging the rotary cutting blade of the electric cutter 10, the groove | channel 2, the coffin hole 3, and the horizontal hole 4 can be formed by one process, and work efficiency further improves.

  In the above embodiment, the case where the crack generated on the outer wall of the building is repaired has been described. However, the present invention is not limited to the repair of the crack generated on the outer wall of the building, but also paved roads, road side walls, airport runways, concrete. It can also be applied to repairing cracks in other structures such as steel piers and bridges.

It is sectional drawing of the building outer wall which applied and repaired this invention. It is the figure which looked at the repair part from the wall surface upper side. It is a figure which shows the process of forming a groove | channel. It is a figure which shows the process of forming a horizontal hole. It is a figure which shows the process of forming a groove | channel and a horizontal hole simultaneously. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer wall 2 ... Groove 3 ... Recessed hole 4 ... Side hole 5 ... Crack 6 ... Sealing material 7 ... V-shaped groove 10 ... Electric cutter 11 ... Rotating shaft 12, 13, 14 ... Diamond blade

Claims (3)

A step of forming a groove having a constant width along the crack on the upper surface of the crack generated in the structure; a step of forming a pothole having a diameter larger than the groove width on the groove; and a rotational axis of the groove from the width of the groove. A step of forming a horizontal hole below the groove by inserting a rotary cutting blade having a small diameter larger than the groove width from the shaft hole and moving the rotary shaft along the groove; and A method for repairing a crack in a structure, comprising a step of filling a sealing material therein. Forming a groove having a constant width along the crack on the upper surface of the crack generated in the structure; and rotating the rotary cutting blade having a rotation axis smaller than the groove width and larger in diameter than the groove width. And then forming a horizontal hole below the groove by moving the rotating shaft along the groove, and then forming a horizontal hole inside the groove. A method of repairing a crack in a structure comprising the step of filling a sealant with a sealing material. On the crack that has occurred in the structure, press the rotary cutting blade with a small diameter cutting blade and a large diameter cutting blade on the rotating shaft so that the latter is located on the tip side. A step of forming a horizontal hole below the groove by moving a rotating shaft along the crack, and a step of filling a sealing material in the horizontal hole and the groove. A method of repairing a crack in a structure characterized by comprising:

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