JP4891062B2 - Existing mortar regeneration method - Google Patents

Description

  The present invention relates to an existing mortar regeneration method for repairing an existing mortar layer without peeling off when repairing an existing mortar that is constructed to protect a slope.

  2. Description of the Related Art Conventionally, a slope protection method that prevents falling rocks and earth and sand from collapsing by covering a slope with an exposed mountain surface with mortar has been widely known.

  In this way, the mortar layer constructed on the slope may crack due to secular change or aging, and when rainwater enters from this crack, the surface of the natural ground is eroded by the rainwater etc. There may be a gap between the bed and the ground, and the mortar layer situation may become brittle.

  If such a brittle mortar layer is left unattended, there is a risk that the mortar mass will collapse later.

  Therefore, when the mortar applied on the slope is aged, the existing aged mortar layer is peeled off from the slope to expose the slope, and the exposed slope is covered with a new mortar. As a result, the slope protection work was carried out to protect the slope again.

  However, in this slope protection construction, it is necessary to dispose of the existing mortar peeled and removed from the slope as industrial waste, and there is a problem that this disposal treatment is very expensive.

  As a method of slope protection construction that solves such problems, a repair method for existing mortar spraying construction that protects the slope by repairing the existing mortar layer without peeling is proposed. (For example, refer to Patent Document 1).

  In this repair method, first, an existing mortar layer is washed, then anchor pins are driven at a predetermined interval, and then a cement is filled in a gap formed between the back surface of the existing mortar layer and the surface of the natural ground.

  Next, by applying an adhesive to the surface of the existing mortar layer, the surface of the existing mortar layer is coated with the adhesive, and the adhesive is allowed to enter the cracks generated in the existing mortar layer, Reinforce cracks.

Finally, the existing mortar layer is peeled off by covering the entire existing mortar layer by applying a new mortar layer to the surface of the existing mortar layer by coating the mortar layer with a predetermined thickness. I tried to protect the slope without doing it.
JP 2005-36579 A

  However, the conventional method described above may not be able to sufficiently reinforce the crack portion generated in the existing mortar layer.

  In other words, the cracks that occur in the existing mortar layer are very thin with a width of several millimeters, and just by applying an adhesive to the surface of the existing mortar layer as in the conventional construction method, The crack could not be sufficiently reinforced without allowing the adhesive to penetrate.

  Therefore, in the present invention according to claim 1, in the existing mortar regeneration method for regenerating the existing mortar layer constructed to protect the slope of the natural ground, the width of the crack generated in the existing mortar layer is expanded. If there is a gap between the crack expansion process, the crack repair process that fills the crack with the expanded width, and the back surface of the existing mortar layer and the slope of the natural ground, a cement And a back surface repairing step of filling the filler.

  Moreover, in this invention which concerns on Claim 2, in the existing mortar reproduction | regeneration construction method of Claim 1, the surface treatment process which apply | coats an adhesive agent on the surface of the existing mortar layer, and the surface of the mortar layer which performed surface treatment And a surface protection step of forming a resin mortar film.

  According to a third aspect of the present invention, in the existing mortar reclaiming method according to the second aspect, the resin mortar film is prepared by kneading a powdery cake mainly composed of cement and an admixture mainly composed of a water-soluble resin. It is characterized by comprising a mixed material.

  According to a fourth aspect of the present invention, in the existing mortar recycling method according to the second or third aspect, the repair agent is made of the same material as the resin mortar film.

  Moreover, in this invention which concerns on Claim 5, in the existing mortar reproduction | regeneration construction method of Claim 3 or Claim 4, a resin mortar film | membrane is a thing which knead | mixed the powder cake and the liquid mixture in the ratio of about 3 to 1. It is characterized by being.

  According to the present invention, the following effects are produced. That is, in this invention which concerns on Claim 1, in the existing mortar reproduction | regeneration construction method which reproduces the existing mortar layer constructed in order to protect the slope of a natural ground, the width | variety of the crack which arose in the existing mortar layer is expanded. If there is a gap between the crack expansion process, the crack repair process that fills the crack with the expanded width, and the back surface of the existing mortar layer and the slope of the natural ground, a cement It is characterized by having a back surface repairing process for filling the filler, and in the existing mortar layer, the crack width caused by aging, aging, etc. is very narrow, in millimeters. However, the repair agent can be sufficiently filled up to the back side of the crack, and thereby the strength of the cracked portion after the repair can be increased.

  Moreover, in this invention which concerns on Claim 2, in the existing mortar reproduction | regeneration construction method of Claim 1, the surface treatment process which apply | coats an adhesive agent on the surface of the existing mortar layer, and the surface of the mortar layer which performed surface treatment In addition, the surface protection step of forming a resin mortar film is characterized by covering the surface of the existing mortar with a resin mortar having a high adhesive strength, so that The amount of use can be reduced as much as possible, and the cost required for reconstructing existing mortar can be reduced.

  According to a third aspect of the present invention, in the existing mortar reclaiming method according to the second aspect, the resin mortar film is prepared by kneading a powdery cake mainly composed of cement and an admixture mainly composed of a water-soluble resin. Since it is characterized by comprising a mixed material, the adhesive force between the resin mortar and the surface of the existing mortar is improved, and as a result, the durability of the existing mortar after repair and regeneration is improved.

  Further, in the present invention according to claim 4, in the existing mortar recycling method according to claim 2 or claim 3, the repair agent is made of the same material as the resin mortar film, and therefore cracks are caused. The adhesive force between the filled repair agent and the resin mortar film that protects the surface of the existing mortar is improved, and the strength of the crack portion after repair can be increased.

  Moreover, in this invention which concerns on Claim 5, in the existing mortar reproduction | regeneration construction method of Claim 3 or Claim 4, a resin mortar film | membrane is a thing which knead | mixed the powder cake and the liquid mixture in the ratio of about 3 to 1. Since the resin mortar has increased adhesive strength and the resin mortar can have elasticity, even if the resin mortar film has a thickness of several millimeters, the existing mortar layer The surface can be sufficiently protected, the durability of the existing mortar layer after repair and regeneration can be improved, and the cost required for the reconstruction work of the existing mortar can be reduced.

  The existing mortar regeneration method according to the present invention is a method of regenerating an old mortar layer that has been aged when an existing mortar layer that has been constructed to protect the slope of a natural mountain has deteriorated.

  Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. 1 is a schematic cross-sectional view showing a cleaning process for an existing mortar layer, FIG. 2 is a schematic cross-sectional view showing a crack expansion process for the existing mortar layer, and FIG. 3 shows a crack repairing process for the existing mortar layer. FIG. 4 is a schematic cross-sectional view showing a back surface repair process of an existing mortar layer, FIG. 5 is a schematic cross-sectional view showing a surface protection process of the existing mortar layer, and FIG. 6 is an existing mortar. It is a cross-sectional schematic diagram which shows the surface protection process of a layer.

  In the existing mortar regeneration method of this embodiment, as shown in FIG. 1, first, a cleaning process is performed for cleaning the surface of the aging existing mortar layer 2 that covers and protects the slope of the natural ground 1. In addition, the code | symbol 2a in FIG. 1 has shown the crack which arose in the existing mortar layer 2 by secular change, aging, etc., and the code | symbol 3 is due to the rainwater which infiltrated from the crack 2a, the groundwater which exuded from the natural ground, etc. The space | gap produced between the back surface of the existing mortar layer 2 is shown by eroding the surface of the natural ground.

In this cleaning process, high-pressure cleaning water (for example, cleaning water having a water pressure of 250 to 350 kg / cm ² ) 4 is sprayed onto the existing mortar layer 2 to wash away dust and dirt on the surface of the existing mortar layer 2 and The mortar piece 2b that has become brittle due to change or aging is removed. Note that the water pressure of the cleaning water 4 can be arbitrarily changed as long as dust and dirt attached to the existing mortar layer 2 can be cleaned and the mortar piece 2b that has become brittle can be removed. Good.

  Next, as shown in FIG. 2A, a crack expansion process is performed to expand the width of the crack 2a generated in the existing mortar layer 2.

  In this crack expansion process, as shown in FIG. 2 (b), as shown in FIG. 2 (c), the blade of a cutting grinder such as a sander is applied along the inner wall of the crack of several millimeters in width. The width of the crack 2a is expanded to several centimeters.

  Next, as shown in FIG. 3, a crack repairing process is performed in which the repairing agent 5 is filled in the crack 2 a having an expanded width. In this crack repair process, the repair agent 5 is filled in the crack 2a by applying the repair agent 5 to the crack 2a using a trowel.

  Thus, in this embodiment, after the crack 2a having a width of several millimeters is expanded to several centimeters in advance before repair, the repair agent 5 is filled in the crack 2a having an expanded width. Therefore, even if the width of the crack 2a generated due to secular change, aging, etc. is very narrow in the millimeter unit, the repair agent 5 is sufficiently applied to the deep side of the crack 2a. Thus, the strength of the crack 2a after repair can be increased.

  Further, in this crack repairing process, as the repairing agent 5 to be filled in the crack 2a, a resin mortar in which a powdery mash having a cement as a main component and an admixture containing a water-soluble resin as a main component is used. Yes.

  The breakdown of the weight ratio of the powder mash that is the material of this resin mortar is that 60% is Portland cement, 40% is cinnabar, 1% is special soot (fiber: glass fiber), 1% Strength is a viscosity modifier. In addition, an ethylene vinyl acetate copolymer aqueous emulsion is used as a main material of the admixture.

  In particular, in the present embodiment, a mixture in which the weight percent concentration of the mixed solution in the repair agent 5 is 25% to 30% is used, and preferably, the weight ratio of the powder cake to the mixed solution Is mixed as a repair agent at a ratio of 3: 1.

  By kneading each material at such a blending ratio, the adhesive strength of the repair agent 5 is improved, and the repair agent 5 after solidification can be made elastic, so that the crack 2a portion after repair is formed. Even if it contracts and expands due to the daily or yearly difference in temperature and humidity, the crack 2a is unlikely to be generated again in the crack 2a due to the elasticity of the repair agent 5, and the strength of the crack 2a increases.

When the gap 3 exists between the back surface of the existing mortar layer 2 and the slope of the natural ground 1 as in the present embodiment (see FIG. 1), as shown in FIG. A back surface repair process is performed in which cement filler is filled.

  In this back surface repair process, as shown in FIG. 4 (a), first, the place where the air gap 3 is generated between the back surface of the existing mortar layer 2 and the surface of the natural ground 1 is investigated, and the air gap 3 is generated. The cement filling hole 2c reaching from the surface of the existing mortar layer 2 to the void 3 is formed at the place where the mortar layer 2 is located.

  At this time, as an investigation method for finding the void 3, a method of outputting infrared rays, ultrasonic waves, or the like to the existing mortar layer 2 and determining whether or not the void 3 is generated based on the reflected wave, Any inspection method such as a method of hitting the surface with a hammer or the like and determining whether or not the gap 3 is generated by the hitting sound can be used.

When the cement filling hole 2c is formed, holes having a predetermined size (for example, a diameter of 40 mm) are formed at a predetermined interval (for example, one interval in ² m ² ) in the region where the void 3 is generated. Form.

  Thereafter, the cement-type filler 6 is filled into the gap 3 from the cement filling hole 2c thus formed, thereby repairing the back side of the existing mortar layer 2. As the filler 6, any material such as cement milk, mortar, and foamed mortar can be used as long as it is a material that has fluidity at the time of filling and then solidifies.

  And in this back surface repair process, as shown in FIG.4 (b), in the several cement filling hole 2c formed in the one area | region where the space | gap 3 has arisen, it forms in the lowest side in a slope. The cement filler 6 is sequentially filled into the gap 3 from the cement filling hole 2c.

  At this time, after filling the filler 6 from the first cement filling hole 2c, if the filler 6 flows backward (overflow) from the cement filling hole 2c, the filling from the lowest end of the gap 3 to the cement filling hole 2c is performed. Therefore, the cement filling hole 2c is plugged with a quick-drying mortar or the like.

  Next, the filler 6 is filled from the cement filling hole 2c formed on the upper side of the plugged cement filling hole 2c, and this operation is repeated to finally form the uppermost surface on the slope. When the backflow of the filler 6 from the cement filling hole 2c is detected and plugged, the back surface repair work in the gap 3 is completed.

  Then, when the back surface repair work for all the gaps 3 is completed, the back surface repair process is completed.

  Next, as shown to Fig.5 (a), the surface treatment process which apply | coats the adhesive agent 7 to the surface of the existing mortar layer 2 which finished the back surface repair process is performed. In this surface treatment step, the adhesive 7 is infiltrated from the entire surface of the existing mortar layer 2, and the entire surface of the existing mortar layer 2 is formed into a fine uneven shape by the adhesive 7 as shown in FIG. By performing the surface processing, the resin mortar film 8 (see FIG. 6) applied in the next surface protection step is favorably adhered to the surface of the existing mortar layer 2.

  Next, the surface protection process which forms the resin mortar film | membrane 8 which consists of the same material as the repair agent 5 used at the said crack repair process on the surface of the existing mortar layer 2 which performed the surface treatment is performed.

  That is, the resin mortar film 8 formed in this surface protection step is made of a material obtained by kneading a powdery mash mainly composed of cement and an admixture mainly composed of a water-soluble resin, like the above-described repairing agent 5. It is composed.

  And the powder mash which is the material of this resin mortar film | membrane 8 is also the same as the said repair agent 5, Out of the total weight, a little less than 60% is Portland cement, a little less than 40% is cinnabar, and a little over 1% is special. Susa (fiber: glass fiber) having a viscosity of 1% or more is used as a viscosity adjusting material, and an ethylene-vinyl acetate copolymer aqueous emulsion is also used as the main material of the admixture.

  Further, as for the blending ratio between the powder cake and the mixed solution in the resin mortar film 8, as in the case of the repair agent 5, a mixture in which the weight percent concentration of the mixed solution occupies the whole is 25% to 30%. Preferably, a material obtained by kneading the weight ratio of the above powder cake and the above mixture at a ratio of 3 to 1 is used as the material.

  Since the distribution of each raw material is adjusted in this way, the resin mortar film 8 has a higher adhesive force to the existing mortar layer 2 than a general mortar and has a higher elasticity than a general mortar. Even if the resin mortar film 8 contracts and expands due to daily and yearly differences in temperature and humidity after regeneration, cracks are unlikely to occur, and even when applied at a relatively thin thickness (for example, a thickness of 2 mm to 4 mm). Sufficient strength can be ensured.

  Further, in the present embodiment, as described above, the repair agent 5 that is filled to repair the crack 2a and the resin mortar film 8 that finally covers the entire surface of the existing mortar layer 2 are made of the same material. The adhesive force between the repair agent 5 filled in the crack 2a and the resin mortar film 8 covering the entire surface of the existing mortar layer 2 can be improved as much as possible, and the strength of the crack 2a portion after repair is further increased. Further improvement.

  That is, in the present embodiment, the repairing agent 5 and the resin mortar film 8 are integrated with each other in a cross-sectional view of the crack 2a portion instead of connecting both sides of the crack 2a only with an adhesive as in the conventional method. To form an adhesive member having a substantially T-shaped cross section, and the adhesive member having a substantially T-shaped cross-sectional view is in close contact with both inner walls of the crack 2a and the surface of the existing mortar layer 2 in the vicinity of the crack 2a. Since it acts so as to connect the surfaces, the strength of the repaired crack 2a portion is further improved.

It is a cross-sectional schematic diagram which shows the washing | cleaning process of the existing mortar layer. It is a cross-sectional schematic diagram which shows the crack expansion process of the existing mortar layer. It is a cross-sectional schematic diagram which shows the crack repair process of the existing mortar layer. It is a cross-sectional schematic diagram which shows the back surface repair process of the existing mortar layer. It is a cross-sectional schematic diagram which shows the surface protection process of the existing mortar layer. It is a cross-sectional schematic diagram which shows the surface protection process of the existing mortar layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground mountain 2 Existing mortar layer 2a Crack 2b Mortar piece 2c Cement filling hole 3 Cavity 5 Repair agent 6 Filler 7 Adhesive 8 Resin mortar film

Claims (5)

In the existing mortar reclamation method to regenerate the existing mortar layer constructed to protect the slope of the natural ground,
A crack expansion process for expanding the width of a crack generated in an existing mortar layer;
A crack repairing process for filling the crack with the expanded width with a repair agent;
When a gap exists between the back surface of the existing mortar layer and the slope of the natural ground, a back surface repairing step of filling the gap with a cement-based filler,
An existing mortar recycling method characterized by comprising: A surface treatment step of applying an adhesive to the surface of the existing mortar layer;
The existing mortar recycling method according to claim 1, further comprising a surface protection step of forming a resin mortar film on the surface of the mortar layer subjected to the surface treatment.   3. The existing mortar reclaiming method according to claim 2, wherein the resin mortar film is made of a material obtained by mixing a koji powder mainly composed of cement and a mixed liquid mainly composed of a water-soluble resin.   The existing mortar regeneration method according to claim 2 or 3, wherein the repair agent is made of the same material as the resin mortar film.   5. The existing mortar recycling method according to claim 3, wherein the resin mortar film is obtained by kneading the powder cake and the admixture at a ratio of about 3 to 1.

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