JPS6031985B2 - Repair method for building exterior walls - Google Patents

Description

Detailed Description of the Invention In general, in buildings where concrete walls are finished with cement mortar or tiles, stone slopes, etc. are adhered to the surface of the mortar, cracks and floating effects, which are the fate of mortar, occur. As a result, the mortar layer is locally separated from the concrete wall surface and swells over time, causing cracks to appear on the exterior surface, causing the exterior surface to fall locally or cause rain to leak.

Therefore, conventionally, a hole that reaches the inside of the concrete wall is first drilled using an electric drill at the location where cracks or floating occur, and then the inside of the hole is cleaned by sucking up the mortar shavings with a vacuum cleaner. Then, after inserting a repair pin into the hole, use a grease pump or the like to inject epoxy resin liquid from the entrance surface of the hole so that it spreads through the hole into the gap between the concrete wall and the exterior wall. According to this method, repair work on the outer wall was carried out by
If too much epoxy resin is injected, the lifting of the exterior wall becomes larger and the bulge increases, and if too little is injected, the adhesion of the exterior wall to the concrete wall is insufficient, resulting in soot. However, there is a work inconvenience in that sufficient care must be taken when injecting the epoxy resin, and since the repair pin is buried in the epoxy resin, the pin is injected into the concrete through the epoxy resin. The problem is that the wall and the exterior wall are simply connected, and therefore, it is not possible to sufficiently prevent the exterior wall from tightening due to deterioration of the epoxy resin.

Therefore, this application proposes a method of repairing the external wall surface of a building to improve such defects.The following is an example of the method in detail with reference to the drawings. Exterior wall a using an electric drill
After drilling a hole 1 that penetrates the concrete wall b and reaches the inside of the concrete wall b, the inside of the hole 1 is cleaned using a dust suction machine or the like.

Next, as shown in FIG. 1, a cylindrical body made of, for example, stainless steel is slightly shorter than the length of the hole 1, and when this is fully inserted into the hole 1, the concrete wall b and the exterior wall a are connected. A sleeve 3 having an opening 2 extending circumferentially at a position corresponding to the gap c formed between the sleeves 3 and 3 is inserted into the hole 1. This sleeve 3 has hole 1
In order to facilitate insertion into the car body, a slit 4 is formed in a diameter slightly smaller than the diameter of the hole, and a single slit 4 is provided in the direction of the car mother so that the cross section has a C-shape as shown in FIG. As shown in the figure, a groove 5 is provided leaving one end 5'. Then, the sleeve 3 configured in this way is inserted into the hole 1.
After fully inserted into the sleeve 3, a semi-solid modified epoxy resin material (for example, one containing an epoxy resin as a main component and an adhesive such as synthetic rubber) 6 is inserted into the sleeve 3.

This epoxy resin material 6 is molded into a rod shape, and its length is predetermined based on the width of the gap c formed between the concrete wall b and the exterior wall a. The state in which the material 6 is longer than the length of the sleeve 3 is shown. In this state, a hollow jig 9 is installed, which has a protrusion 7 at its tip that faces into the opening of the hole 1 and comes into contact with the end surface of the sleeve 3, and a collar 8 that receives the surface of the exterior wall a. A push rod 10 made of steel that is slightly thicker than the inner diameter of the sleeve 3 is inserted into the jig 9. The tip end 10' of this push rod 10' is formed into a pointed shape, and its length is approximately equal to the length of the sleeve 3. Therefore, in the state shown in FIG. Alternatively, the push rod 10 is pushed in the direction of the arrow by a press-fitting device. Then, the semi-solidified rod-shaped epoxy resin material 6 expands while entering the gap c between the concrete wall b and the exterior wall a through the opening 2, and the shaft 10 expands from the inner diameter of the sleeve 3. Due to the large thickness, the sleeve 3 is also pushed outward in the outer circumferential direction, and the sleeve 3 is tightly fitted into the hole 1 to be in the state shown in FIG. 2. As a result, Conch 1
The outer wall b and the exterior wall a are bonded together by the solidification of the epoxy resin material that has entered the gap between them, and the sleeve 3 is brought into close contact with the hole 1, which strengthens the bond between the two walls. Even if the bonding of the exterior wall a to the concrete wall b loosens due to deterioration of the resin over time, the sleeve 3 reliably prevents the binding of the exterior wall a from the concrete wall b. As described above, according to the construction method of the present application, since a semi-solidified rod-shaped epoxy resin material is used, it is convenient to handle, and it is possible to prevent the spread of the gap between the concrete wall and the exterior wall in advance. Not only can the length of the epoxy resin be arbitrarily selected and the gap between the concrete wall and the exterior wall can be filled with just the right amount of epoxy resin, but the filling operation can also be performed easily. It is highly workable, and after press-fitting the dowel rod into the sleeve, the close action of the sleeve against the hole further strengthens the bond between the exterior wall and the concrete wall, providing durability for repair work. It has the following advantages.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application; FIG. 1 is a sectional view showing the state before filling with epoxy resin material, FIG. 2 is a sectional view showing the repaired state, and FIGS. 3 and 4 are views showing the sleeve. FIG. 2 is a perspective view and a sectional view thereof. In the figure, 1 is a hole, 2 is an opening, 3 is a sleeve, 4 is a slit,
5 is a split groove, 6 is an eboxy resin material, 9 is a pick-up tool, 1 river force rod, a is an exterior wall, b is a concrete wall, and c is a void. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A cylindrical body is inserted into a repair hole drilled through the exterior wall to reach the inside of the concrete wall, and when the cylindrical body is inserted into the hole, the gap between the two walls is A sleeve having an opening and at least one axially extending slit is inserted at a position corresponding to the void in the sleeve, and a semi-solid rod-shaped epoxy resin material is inserted into the sleeve. By press-fitting a push rod larger than the inner diameter into the sleeve while pushing the epoxy resin material, the epoxy resin material enters into the gap through the opening and the sleeve is tightly fitted into the hole. A method of repairing the exterior walls of buildings. 2. The method for repairing an external wall surface of a building according to claim 1, wherein the axial length of the sleeve is made slightly smaller than the length of the hole, and a push rod having a length substantially equal to the axial length is used.