JPH0828063A - Structure of repairing crack on concrete external wall - Google Patents

Abstract

PURPOSE:To arrest development of cracks on a concrete external wall, to restore functions such as sound insulation and waterproofness and neat appearances required for the external wall while keeping air permeability, and to make the restored function durable. CONSTITUTION:Existing finishing material S on a concrete external wall W is stripped off approximately in the width of 10cm respectively on the right and the left with the line of crack on the external wall as the center, and grooves 2, each in U-shaped section and approximately in the depth of 15mm, are provided approximately in the width of 10mm respectively on the right and the left with the line of crack as the center. Polymer cement 3 is applied along the inside of the groove 2 and the surface wherefrom the existing finishing material is stripped off, and the groove 2 is filled with SBR resin mortar 5 in low permeability containing granular foaming aggregates 4 in the grain size of 2-3mm. A polyester nonwoven fabric 7, approximately in the width of 15cm, is stuck with polymer cement mortar 8 to the remaining stripped-off surface of the existing finishing material including the area filled with the mortar 5, and thin coating is made thereon with polymer cement mortar 9. A glass fiber net 10 having high tensile strength is stretched over the coated surface with polymer cement mortar 11 applied thereto, and impermeable finishing material 12 is sprayed on the surface of the uppermost layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall structure for preventing cracks generated in a concrete outer wall from advancing, recovering outer wall functions such as sound insulation, waterproofing, and aesthetics, and maintaining it for a long period of time.

[0002]

2. Description of the Related Art A wide variety of countermeasures have been attempted so far with respect to cracks occurring in concrete outer walls. However, definitive measures have not yet been found due to the limit of durability of the concrete material due to the structure, the properties of the concrete material, and the like. Conventional general concrete
To prevent cracks on the outer wall, (a) inject a resin adhesive into the crack (b) cut the surface layer of the crack into a U-shaped or V-shaped cut groove in cross section, and seal the elastic sealing material in general. It is used a lot.

In the case of (a) the resin adhesive injection, (a) the adhesion is unstable with respect to the wet surface and the dirty surface, and the adhesive effect cannot be sufficiently obtained. (B) It is difficult to confirm the injection amount of the resin adhesive. (C) Even if the resin-based adhesive is completely injected, weathering of the crack inner surface itself often progresses after a long period of time after the occurrence of the crack, and the anchor effect of the resin-based adhesive on the cracked surface. There is no adhesive effect. (D) In addition to the above (a), (b), and (c), the strength of the concrete surface cannot follow various movements of concrete, the same as simply inserting a filling in the crack gap. It becomes a state. (E) A crack reappears within a few years after the repair. There are difficulties such as

Further, in the above-mentioned (b) seal made of the sealing material for the U-shaped or V-shaped cut groove, (a) the crack has the same function as a kind of opening, and a seal is formed at that portion. -As a result, on the back of the seal,
Condensation will occur due to the difference in temperature and humidity inside and outside the wall. When dew condensation occurs, CO ₂ and organic substances in the air are dissolved in the dew condensation water, and the dew condensation water is acidified. Then, the strongly alkaline concrete and the acidic dew condensation water are neutralized and neutralized. When the concrete is neutralized, the calcium content in the concrete is melted to cause a white flower phenomenon, which accelerates weathering and makes the concrete brittle so that cracks further expand. Also,
This condensed water repeatedly freezes in the winter, and the crack expands more and more due to the freezing and expanding force of the water. And after repair 2
Within 3 years, the side of the ceiling will come off. (B) After the completion of the repair, slug-like repair marks remain, and the aesthetics of the wall are significantly impaired. There are drawbacks such as.

In addition to the above (a) and (b), a technique of partially peeling off the finishing material at the cracked portion and applying a net such as a gauze cloth with a resin-mixed mortar from this (Japanese Patent Laid-Open No. 4-67)
546) has been proposed. In this technique, since the groove is not dug in the crack portion, it is not possible to flexibly follow the crack when it moves, so even if it is a small rampage, the crack line is likely to appear on the surface, and the net body with a weak tensile strength such as a gauze cloth Since one piece is embedded, the strength is not secured sufficiently and there is a problem that cracks are likely to occur again at the same place.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and prevents the cracks generated on the outer wall of the concrete from advancing and keeps the air permeability, while the outer wall has sound insulation, waterproofing, and aesthetic appearance. It provides a wall structure to restore and maintain function.

[0007]

In order to solve the above-mentioned problems, the present invention peels off the old finish material S with a width of about 8 to 10 cm left and right centering on the crack line C appearing on the wall surface of the concrete outer wall W. Along with the crack line C as the center, about 1
Section U or V with a width of 0 to 20 mm and a depth of about 15 to 20 mm
Dig the groove 2 in the shape of a letter. Polymer cement 3 is applied along the inner surface of the groove 2 and the exfoliated surface 1 of the old finish material, and the groove 2 is filled with granular foam aggregate 4 having a diameter of about 2 to 3 mm. Is filled, and an alkali resistant non-woven fabric having a width of about 15 cm is attached to the peeling surface 1 of the residual old finishing material including the filling surface 6 with a polymer-cement mortar 8.
Further, a thin layer of polymer-cement mortar 9 is applied on the surface. From above, an alkali resistant mesh sheet having a high tensile strength and having a size covering at least the exfoliated surface 1 of the old finish material is stretched, and the polymer cement mortar 11 is applied to such an extent that the mesh cannot be seen. Then, the breathable finishing material 12 is applied or sprayed on the outermost surface.

The alkali resistant nonwoven fabric is polyester nonwoven fabric 7. Further, the alkali resistant mesh sheet is a glass fiber net 10.

[0009]

According to the present invention, as described above, the groove 2 having a U-shaped or V-shaped cross section is dug along the crack line C of the outer wall W of the concrete.
Since the groove 2 is filled with the air-permeable, weak-strength SBR resin mortar 5 containing the granular foam aggregate 4 of the air-permeable flexible material, even if various movements are further generated in the concrete outer wall W, the deformation is flexible. Since the mesh sheet of high tensile strength is embedded in the surface of the groove 2 having a U-shaped or V-shaped cross section, cracks do not surface, the wall aesthetic is maintained and ventilation, sound insulation, waterproofing, etc. The outer wall function of can be maintained. In addition, since the materials used including the polymer-mortar have air permeability, the air permeability between the inside and outside of the wall on the exterior surface of the crack is ensured, and the resin mortar 5 containing the granular foam aggregate 4 has heat insulating properties. Condensation is prevented.

[0010]

EXAMPLE In the state before repair, as shown in FIG. 2, a crack K is also formed in the old outer wall finish material S due to a crack K inside the concrete outer wall W, and a crack line C appears on the wall surface. It is in a state. The crack repair structure of the concrete outer wall of the present invention will be described step by step with reference to the drawings showing the embodiments of the present invention. As shown in FIG. 1, a crack line C appearing on the wall surface of the concrete outer wall W is shown. Finishing material S with a width of 10 cm as the center
And about 10m left and right centering on the crack line C
A groove 2 having a U-shaped cross section is dug into a width of m and a depth of about 15 mm.
Polymer cement 3 is evenly applied to the inner surface of the groove 2 having a U-shaped cross section and the scraping surface 1 of the residual old finishing material S.

The groove 2 is filled with a breathable weak-strength SBR resin mortar 5 containing a granular foam aggregate 4 having a diameter of 2 to 3 mm. A polyester non-woven fabric 7 having a width of about 15 cm centering on the crack line C is attached to the filling surface 6 and the peeling surface 1 of the residual old finishing material S with a brush using a brush-applying polymer cement mortar 8 (cement filler). Further, a trowel is used to thinly coat the trowel coating polymer-cement mortar 9. Then, a glass fiber having a high tensile strength with a width that covers the entire stripped surface 1 of the old finishing material S including the surface to which the polyester non-woven fabric 7 is attached and further penetrates to the outer surface of the old finishing material S to a width of about 10 cm. Polymer 10 for trowel coating-cement mortar 1
1 is embedded, and finally the breathable finishing material 12 is sprayed.
In addition, the inside of the crack K of the concrete outer wall W is not modified.

[0012]

EFFECTS OF THE INVENTION A groove 2 dug into a crack line C in a U-shaped or V-shaped cross section is filled with a breathable weak-strength SBR resin mortar 5 containing a granular foam aggregate 4 made of a breathable flexible material, and the surface thereof. Even if various movements occur on the outer wall W of the concrete by sticking a non-woven fabric on the same, the movements are dispersed and the deformation of the outer wall W of the concrete flexibly follows. Can also cross section U
Alternatively, the surface of the V-shaped groove 2 has a high tensile strength mesh sheet.
By embedding the outer wall, it is possible to maintain the aesthetics of the wall without exposing the cracks that occur inside the concrete outer wall and keep the ventilation, while maintaining the outer wall functions such as sound insulation and waterproofing for a long time. It was Further, since the materials used including the polymer-mortar have air permeability, the air permeability between the inside and outside of the wall on the exterior surface of the cracked portion is ensured, and the resin mortar 5 containing the granular foam aggregate 4 has heat insulating properties so that dew condensation is caused. Since it is also prevented, it is possible to prevent further cracks from progressing due to dew condensation.

[Brief description of drawings]

FIG. 1 is a vertical side view of the present invention.

FIG. 2 is a vertical side view before repair.

[Description of sign]

1 Stripped surface of old finish material 2 Groove with U-shaped cross section 3 Polymer-cement 4 Granular foam aggregate 5 Granular foam aggregate containing breathable weak strength SBR resin mortar 6 Granular foam aggregate containing breathable weak strength SBR resin Mortar filling surface 7 Polyester non-woven fabric 8 Polymer for cement coating mortar 9 Polymer for cement coating Cement mortar 10 Glass fiber net 11 Polymer for coating iron Cement mortar 12 Breathable finishing material K Crack C Crack line S Outer wall old finishing material W Concrete outer wall

Claims (3)

[Claims] 1. An old finish material S having a width of about 8 to 10 cm on the left and right centering on a crack line C appearing on the wall surface of the concrete outer wall W.
And a groove (2) having a U-shaped or V-shaped cross section with a width of about 10 to 20 mm and a depth of about 15 to 20 mm centering on the crack line C, and the inner surface of the groove (2) and the old Polymer cement (3) is applied along the stripped surface (1) of the finishing material, and the groove (2) is filled with granular foam aggregate (4) having a diameter of about 2 to 3 mm. 5) is filled, an alkali resistant non-woven fabric having a width of about 15 cm is adhered to the exfoliation surface (1) of the residual old finishing material including the filling surface (6) with polymer cement mortar (8), and the surface is further polymerized. Apply a thin coat of cement mortar (9),
A polymer cement mortar (11) is applied to the extent that it covers at least the exfoliated surface (1) of the old finish material and a high tensile strength alkali-resistant mesh sheet is stretched so that the mesh cannot be seen. A structure for repairing cracks on a concrete outer wall, which is formed by applying or spraying a breathable finishing material (12) on the layer surface. 2. The structure for repairing cracks in a concrete outer wall according to claim 1, wherein the alkali-resistant nonwoven fabric is a polyester nonwoven fabric (7). 3. The structure for repairing cracks in a concrete outer wall according to claim 1, wherein the alkali-resistant mesh sheet is a glass fiber net (10).