JP2024073761A - Resin spraying method - Google Patents

Abstract

To provide a resin spraying method capable of securely laminating (coating) the surface to be sprayed with a resin layer while preventing water from accumulating at the boundary between the sprayed surface and the resin layer by efficiently draining water springing out from the sprayed layer (mortar layer: protective layer) from an area sprayed with the resin to the foot of the slope.SOLUTION: In the resin spraying method of spraying resin onto the surface of a slope sprayed over and built up with a resin layer, a back drainage material is placed over from a drainage pipe (W) of the sprayed layer or a water spring point (GW) to the end of the slope (SE); and/or, a groove (for example U-cut) is formed from a drain pipe (W) installation point on the sprayed layer or a water spring point (GW) to the end of the slope (SE), where the groove is formed only in the sprayed layer and does not reach the slope; or, the groove is not covered with the back drainage material and a drain hose may be placed within the groove.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin spraying method for preventing the intrusion of rainwater and other water through cracks that occur in a protective layer made of mortar or concrete sprayed onto a slope, suppressing deterioration of the protective layer such as salt damage and neutralization, and further preventing the protective layer from peeling off.

A resin spraying method has been proposed in which a resin is sprayed onto the surface of a sprayed layer (protective layer: mortar layer) made of mortar sprayed onto a sloped surface to form a resin layer, thereby preventing the intrusion of rainwater, etc. through cracks that have appeared in the sprayed layer, suppressing deterioration of the sprayed layer, and preventing the peeling off of mortar pieces (see Patent Document 1).
Resin spraying is an effective technique that can repair sprayed layers at low cost.

However, if the treatment of the spring water from the natural ground side (including the drainage from the drainage pipe installed in the sprayed layer) is inappropriate, water H will accumulate at the boundary between the surface of the sprayed layer B and the layer R of sprayed resin (resin layer), causing the resin layer R to swell, as shown in Figure 7. Such swelling of the resin layer R may cause the resin layer R to peel off from the sprayed layer B over a wide area.
In addition, since the resin coating formed by the sprayed resin does not have a high affinity for water, if measures against water seepage on the surface of the sprayed layer B are insufficient, it is difficult to laminate or cover the resin layer R by spraying.

Here, when applying the resin spraying method to a sprayed layer where water is leaking, no effective measures against water seepage have been proposed in the past, and the reality has been that contractors deal with this on a site-by-site basis. In other words, in the prior art, no effective measures against water seepage have been proposed when applying the resin spraying method to a sprayed layer where water is leaking.

Patent No. 6425204

The present invention has been proposed in consideration of the problems with the conventional technology described above, and aims to provide a resin spraying method that can efficiently drain (conduct) spring water from the area where resin is to be sprayed in the spraying layer (mortar layer: protective layer) where spring water is occurring, to the foot of the slope, prevent water (spring water) from accumulating at the boundary between the spraying surface and the resin layer, and reliably laminate (or cover) a resin layer on the surface side of the spraying layer.

The resin spraying method of the present invention is a resin spraying method in which a resin layer is laminated by spraying a resin onto a surface layer of a sprayed layer (protective layer: mortar layer) sprayed onto a sloped surface,
This method is characterized by arranging a back surface drainage material from the drainage pipe (W) installation point of the sprayed layer or the spring water point (GW: see Figure 4) to the foot of the slope (SE: see Figure 4).

Alternatively, the resin spraying method of the present invention is a resin spraying method in which a resin layer is laminated by spraying a resin onto a surface layer of a sprayed layer (protective layer: mortar layer) sprayed onto a sloped surface,
A groove (10: for example, a U-cut with a U-shaped cross section) is formed from the location where the drainage pipe (W) of the sprayed layer is installed or the spring water location (GW) to the end of the slope (SE), and the groove is formed only in the sprayed layer and does not reach the slope ground.
Here, it is preferable that the opening of the groove (10) is covered with a covering material.
The covering material is preferably a back surface drainage material (20).
In the present invention, the opening of the groove (10) is not covered by a covering material (e.g., the back surface drainage material 20), and a drainage hose (40) can be placed in the groove (10).

The slope repair method of the present invention comprises the steps of:
In the case where there is no weathered area in the back ground of the sprayed layer (B) to be repaired,
When the sprayed layer (B) to be repaired does not have peeling parts or through cracks several centimeters wide, and the surface moisture content of the sprayed layer to be repaired is less than 10%, the resin spraying method (according to any one of claims 1 to 5) is carried out,
When the sprayed layer (B) to be repaired has peeling areas or through cracks several centimeters wide, or when the surface moisture content of the sprayed layer to be repaired is 10% or more, the layer is repaired by spraying a solidifying material containing fibers (e.g. mortar) (implementing a fiber-reinforced solidifying material spraying method).

In the present invention, even if the drainage pipe (W) has not been installed or no spring water has occurred at the time of construction, the water can be guided in advance, so construction can be carried out at the location where the drainage pipe (W) is planned to be installed or at a location where there is a high probability of spring water occurring.
In other words, the term "the location of the drainage pipe (W) of the sprayed layer or the location of spring water" in this specification refers not only to the locations (GW) where drainage is actually taking place or where spring water is actually occurring, but also to locations where a drainage pipe (W) will be installed in the future or where there is a possibility of spring water occurring in the future.

According to the present invention having the above-mentioned configuration, the back drainage material is arranged from the drainage pipe (W) installation location or the spring water location (GW: for example, a crack) of the sprayed layer to the foot of the slope (SE), so that water leaking from the drainage pipe (W) installation location or the spring water location (GW) can flow down into the back drainage material (20) and be discharged at the foot of the slope (SE). Therefore, water does not accumulate on the surface of the sprayed layer (B) to be repaired, and after the resin is sprayed onto the sprayed layer (B), water is prevented from accumulating at the boundary between the sprayed layer (B) and the layer of sprayed resin, and swelling is prevented as described above with reference to FIG. 7. In addition, since the surface of the sprayed layer (B) to which the resin is to be sprayed does not get wet, the sprayed resin is prevented from peeling off from the surface of the sprayed layer (B).

Alternatively, in the present invention, spring water or leaking water from the installation location of the drainage pipe (W) or the spring water location (GW) is collected (conducted) by a groove (10) formed from the installation location of the drainage pipe (W) or the spring water location (GW) to the end of the embankment (SE) and is drained at the end of the embankment (SE). Therefore, drainage water or leaking water does not accumulate on the surface of the sprayed layer (B), and the swelling described with reference to Figure 7 is prevented. As a result of collecting water by the groove (10), the surface of the sprayed layer (B) is prevented from getting wet, and the sprayed resin is also prevented from peeling off from the surface of the sprayed layer (B).

In the present invention, if the opening of the groove (10) is covered with the back drainage material (20), even if the amount of drainage water or spring water from the location where the drainage pipe (W) is installed or the spring water location (GW) is greater than the amount of water collected by the back drainage material (20), the water is collected by the groove (10), preventing the drainage water or spring water from penetrating outside the back drainage material (20) and wetting the surface layer (surface) of the sprayed layer (B). Similarly, even if the amount of drainage water or spring water is greater than the amount of water collected by the groove (10), the water is collected by the back drainage material (20), preventing the area other than the groove (10) from being wet.
Alternatively, in the present invention, if the opening of the groove (10) is not covered with a covering material (e.g., the back drainage material 20) and a drainage hose (40) is placed in the groove (10), the water to be drained flows not only through the groove (10) but also through the drainage hose (40) placed therein to the toe (SE), improving drainage efficiency. At the same time, compared to the case where the opening of the groove (10) is covered with a covering material such as the back drainage material (20), the sprayed resin is blocked by the drainage hose (40) and is less likely to penetrate into the groove (10). Furthermore, even if the sprayed resin penetrates into the groove (10) and fills the groove (10) with resin, the water generated at the spring water point (GW) is reliably discharged to the toe (SE) through the drainage hose (40). Therefore, the worker can perform the spraying work without considering the infiltration of the resin into the groove (10), making the spraying work easier.

According to the repair method of the present invention, when there is no weathered area in the back ground of the sprayed layer (B) to be repaired,
When the sprayed layer (B) to be repaired does not have peeling parts or through cracks several centimeters wide, and the surface moisture content of the sprayed layer to be repaired is less than 10%, (the resin spraying method according to any one of claims 1 to 4) is carried out,
If the sprayed layer (B) to be repaired has peeled areas or through cracks several centimeters wide, or if the surface moisture content of the sprayed layer to be repaired is 10% or more, the layer can be repaired, for example, by spraying a solidifying material containing fibers (e.g., mortar) (implementing a fiber-reinforced solidifying material spraying method), so that repairs of the quality required under the conditions at the construction site can be carried out without incurring extra costs.

FIG. 2 is a vertical cross-sectional view showing the state in which the embodiment of the present invention is applied. 2 is a cross-sectional view taken along line AA in FIG. 1. 3 is a flowchart showing an implementation procedure of the embodiment shown in FIG. 1 and FIG. 2 . FIG. 4 is an explanatory cross-sectional view showing a state where a resin spraying method according to a modified example of the embodiment of FIGS. 1 to 3 has been performed. 5 is a cross-sectional view taken along the line A5-A5 in FIG. 4. 10 is a flowchart showing an embodiment of selecting an appropriate repair work depending on the work conditions. FIG. 1 is an explanatory diagram illustrating a problem with the conventional technology.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
An embodiment of the present invention will be described first with reference to FIGS.
In Fig. 1, a sprayed layer B (protective layer: mortar layer) is formed on a slope G (back ground) by spraying and layering a solidifying material such as mortar. A drainage pipe W is installed in the sprayed layer B, and the spring water on the slope G is drained onto the sprayed layer B. The drainage pipe W is arranged so that its slope side end (the left end in Fig. 1) is roughly flush with the sprayed layer B. However, there are cases where the drainage pipe W is arranged so that its slope side end is not flush with the sprayed layer B.

In Fig. 1, a groove 10, such as a U-cut, is formed from the drainage pipe W installation position of the sprayed layer B to the slope end SE (see Fig. 4). Here, the groove 10 is formed by, for example, a sander.
The water discharged from the drainage pipe W to the surface side of the sprayed layer B passes through the groove 10 and is drained to the end of the slope SE. In other words, the water discharged from the drainage pipe W is collected in the groove 10 and is discharged to the end of the slope SE.

2, the groove 10 is formed with a U-shaped cross section, constituting a so-called "U-cut." However, the cross-sectional shape of the groove 10 is not limited to a U-shape, and is not particularly limited as long as it can be V-shaped, rectangular, or any other shape that can be cut into the solidification material that constitutes the sprayed layer B, such as mortar.
As shown in Figure 2, the groove 10 is cut only into the sprayed layer B and does not reach the slope G (backside natural ground). Therefore, the water collected in the groove 10 will not be absorbed by the natural ground.

Taking into consideration the possibility that the groove 10 alone may not be able to drain all of the water drained from the drainage pipe W to the toe SE, in the illustrated embodiment, the opening of the groove 10 is covered with a back surface drainage material 20, thereby closing the groove 10.
As shown in FIG. 1, the upper end of the back surface drainage material 20 is disposed so as to cover the drainage pipe W.

In Fig. 2, the opening of the groove 10 (upper side in Fig. 2) is covered with a back surface drainage material 20. As is well known, a hollow portion 20I is formed in the back surface drainage material 20. The back surface drainage material 20 has the property of absorbing water from its surroundings by capillary action and guiding the absorbed water to the hollow portion 20. If the groove 10 alone is not able to drain all of the water discharged from the drainage pipe W to the toe SE, the water that does not flow through the groove 10 is absorbed from the lower side of the back surface drainage material 20 and collected in the hollow portion 20I, and then flows down to the toe SE side (downward in Fig. 1) due to the action of gravity.
Alternatively, when the entire amount of water discharged from the drainage pipe W cannot be absorbed by the back surface drainage material 20 alone, the water not absorbed by the back surface drainage material 20 flows through the groove 10 and down to the foot of the slope SE to be drained.
Although not explicitly stated, a drainage treatment facility (shown in the figure) is provided at the end of the bank SE, and water that flows through the groove 10 and/or the hollow portion 20I of the back surface drainage material 20 and down to the end of the bank SE is drained and treated in the drainage treatment facility. There are no particular limitations on the depth dimension of the groove 10.

When covering the opening of the groove 10 with the back surface drainage material 20, the longitudinal edge 20E of the lower surface part where the back surface drainage material 20 is in contact with the sprayed layer B can be adhered and fixed in a constant amount at a predetermined interval. Here, the longitudinal direction is the direction in which the back surface drainage material 20 extends in Fig. 1, and is the direction perpendicular to the paper surface in Fig. 2.
Since the back drainage material 20 is not bonded over the entire longitudinal edge 20E, the non-bonded area is able to absorb water by capillary action.

When covering the grooves 10 with the back surface drainage material 20, it can be fixed by gluing as described above, but the back surface drainage material 20 can also be fixed to the sprayed layer B by pins.
Here, when using pins to fix the back surface drainage material 20 to the sprayed layer B, if the length of the pin is equal to or greater than the thickness of the sprayed layer B, there is a risk that the pin will penetrate the sprayed layer B when the back surface drainage material 20 is fixed. If the pin penetrates the sprayed layer B, a through hole will be formed that penetrates the sprayed layer B, and this through hole will promote drainage of the slope G (back ground) and cause the inconvenience of acting as a new drainage hole. Therefore, when using pins to fix the back surface drainage material 20 to the sprayed layer B, the length of the pin is set to a dimension that does not penetrate the sprayed layer B.
A groove 10 is formed in the sprayed layer B, and the opening (upper part) is covered with a back surface drainage material 20 and fixed to the sprayed layer B. In this case, the length of the pin is set to a dimension that does not penetrate the sprayed layer B, and the depth of the groove 10 is set to less than the thickness dimension of the sprayed layer B, so that there is no risk of the pin and/or groove 10 penetrating the sprayed layer B.

If a groove 10 is formed from the location of the drainage pipe W of the sprayed layer B to be repaired to the foot SE, and the opening of the groove 10 is covered with the back surface drainage material 20, the surface of the sprayed layer B is prevented from getting wet by the drainage from the drainage pipe W. After that, a resin spraying work is carried out on the surface of the sprayed layer B, and the resin is sprayed until the thickness of the resin reaches 1 mm to 2 mm.
Here, resin spraying is performed when the surface of the sprayed layer B is not wet. Whether the sprayed layer B is wet or not can be determined, for example, by measuring the moisture content in the sprayed layer B using a moisture content checker, and if the moisture content is less than a threshold value (e.g., 10%), resin spraying is performed, and if it is equal to or greater than the threshold value, the process waits until the moisture content decreases.
Instead of checking the moisture content, visual inspection is performed.
Is there water flow in the area where the resin is to be sprayed?
Are there any water-wet areas in the area where the resin is to be sprayed?
Is there ice or snow in the area where the resin is to be sprayed?
By checking this, it is possible to determine whether or not to spray resin.
Furthermore, by touching the area to which the resin is to be sprayed with a finger, it is possible to determine whether or not to spray the resin.

By disposing the back drainage material 20 over the slope toe SE, all of the water leaking from the drainage pipe W installation location or the spring water location GW (see FIG. 4: for example, a crack) is made to flow down into the back drainage material 20 and discharged. Therefore, water does not accumulate on the surface of the sprayed layer B, and after the resin is sprayed onto the sprayed layer B, water is prevented from accumulating at the boundary between the sprayed layer B and the layer of sprayed resin, preventing swelling as shown in FIG. 7. In addition, since the surface of the sprayed layer B is not wetted, it is possible to prevent the sprayed resin from peeling off from the surface of the sprayed layer B.
In addition, according to the illustrated embodiment, drainage or spring water (leakage) from the installation location of the drainage pipe W or the spring water location GW (e.g., crack) is collected by the groove 10 formed from the installation location of the drainage pipe W or the spring water location GW to the foot of the slope SE, and is drained at the foot of the slope SE. Therefore, the drainage or leakage water does not accumulate on the surface of the sprayed layer B.
In the illustrated embodiment, the opening of the groove 10 is covered with the back surface drainage material 20, so that even if the amount of drainage water or spring water from the installation location of the drainage pipe W or the spring water location GW (e.g. a crack) is greater than the amount of water collected by the back surface drainage material 20, the water is collected by the groove 10, thereby preventing the drainage water or spring water from penetrating outside the back surface drainage material 20 and wetting the surface portion (front surface) of the sprayed layer B outside the back surface drainage material 20.
Similarly, when the amount of drainage water or spring water is greater than the amount of water collected by the grooves 10, the water is collected by the back surface drainage material 20, so that areas other than where the grooves 10 are formed are prevented from getting wet.

Although not clearly shown in the figure, a groove 10 may be formed from the spring water point GW in the sprayed layer B to the foot of the slope SE (see FIG. 4) instead of at the installation location of the drainage pipe W, and covered with a back surface drainage material 20. Here, the spring water point GW is a point where water leaks out from the surface of the sprayed layer B due to spring water from the natural ground. The spring water point GW may be formed by a crack in the sprayed layer B.
The illustrated embodiment is also installed in a manner similar to that described above at a spring water location GW where no drainage pipe W is provided.

Although not shown in the figures, in the illustrated embodiment, a back surface drainage material 20 is placed from the installation location of the drainage pipe W or the spring water location GW (e.g., a crack) to the foot of the slope SE, but it is possible not to form the groove 10. If the amount of drainage or spring water is small, the entire amount of the drainage or spring water can be collected by the back surface drainage material 20 and drained at the foot of the slope SE.
Similarly, although not shown in the figure, a groove 10 is formed from the installation location of the drainage pipe W or the spring water location (GW, for example, a crack) to the toe SE of the slope, but it is possible to omit the installation of the back surface drainage material 20. If the amount of drainage or spring water is small, the entire amount of drainage or spring water can be collected by the groove 10 and drained at the toe SE of the slope.
That is, in the resin spraying method according to the illustrated embodiment, a groove 10 is formed and/or a back surface drainage material 20 is arranged from the installation location of the drainage pipe W or the spring water location GW in the spraying layer B to the foot of the slope SE.

By forming the groove 10 and arranging the back drainage material 20, the drainage water at the installation location of the drainage pipe W or the spring water from the spring water location GW is guided to the foot of the slope SE by the groove 10 and/or the back drainage material 20, and does not flow to any place other than the water 10 and the back drainage material 20. As a result, the surface of the sprayed layer B is no longer wet (for example, the moisture content is less than 10%). In such a state, the resin is sprayed onto the sprayed layer B in a known manner.
As described above, the surface of the sprayed layer B is not wet, water does not accumulate between the surface of the sprayed layer B and the sprayed resin, and the sprayed resin does not peel off.
Then, when the sprayed resin solidifies, the sprayed layer B is repaired by the layer of solidified resin.

Next, referring mainly to FIG. 3, and also to FIGS. 1 and 2, a procedure for implementing the illustrated embodiment will be described.
In step S1 in Fig. 3, a location where a drainage pipe W is installed in the sprayed layer B to be resin-coated or a location GW where spring water is generated (see Fig. 4) is identified. Then, the process proceeds to step S2.
In step S2, a trench 10 (see FIG. 2) is formed from the location where the drainage pipe W is installed or the location GW where spring water occurs to the foot of the slope SE (see FIG. 4). Then, the process proceeds to step S3.

In step S3, the back surface drainage material 20 is installed so as to cover the opening of the groove 10 (see FIG. 2). The back surface drainage material 20 is installed at the location where the drainage pipe W is installed, or from the location GW where the spring water occurs to the foot of the slope SE.
If the amount of drainage from the drainage pipe W or the amount of water springing from the spring point GW is small, it is possible to omit step S2 and perform only step S3 (install the back surface drainage material 20 and omit cutting the groove 10).
Alternatively, it is also possible to carry out only step S2 and omit step S3 (only cutting the groove 10 and not installing the back surface drainage material 20).

4 and 5 show a state where a resin spraying method according to a modified example of the embodiment described with reference to FIGS. 1 to 3 has been applied.
In Fig. 4, a groove 10 (U-cut) is formed from the spring water location indicated by the symbol GW to the foot of the slope SE at the bottom in Fig. 4. A hollow drainage hose 40 is disposed in the groove 10, and the drainage hose 40 also extends from the spring water location GW to the foot of the slope SE. The internal space of the hollow drainage hose 40 is indicated by the symbol 40I in Fig. 5. The opening of the groove 10 (the upper part in Fig. 5) is not covered by the back surface drainage material 20, but is covered by the sprayed resin layer R.
5, for the sake of simplicity, a relatively large space is shown between the outer periphery of the drain hose 40 and the groove 10 or the resin layer R. The size of the gap between the outer periphery of the drain hose 40 and the groove 10 or the resin layer R may be extremely small.

By providing a drain hose 40 inside the U-cut 10, water generated at the spring point GW is reliably drained through the internal space 40I of the drain hose 40 to the toe of the slope SE.
In addition, because the drainage hose 40 is disposed inside the U-cut 10, even if the opening of the U-cut 10 is not covered with the back surface drainage material 20, the sprayed resin is unlikely to penetrate into the U-cut 10. Even if the resin penetrates into the U-cut 10 and fills the inside of the U-cut 10, the water generated at the spring water location GW is reliably drained to the foot of the slope SE via the internal space 40I of the drainage hose 40. Therefore, the worker can perform the spraying work without worrying about the resin penetrating into the U-cut 10.
As a result, the efficiency of the spraying operation is improved.

Although not shown in the flow chart, when carrying out the modified examples of Figures 4 and 5, first, in the sprayed layer B to be resin-coated, the location where the drainage pipe W is installed or the location GW where the spring water is occurring is identified, as in the case of Figure 3. Then, a U-cut 10 is formed from the location where the drainage pipe W is installed or the location GW where the spring water is occurring to the foot of the slope SE, and a drainage hose 40 is installed in the U-cut 10.
Once the drain hose 40 has been placed inside the U-cut 10, resin spraying is carried out.
Other configurations and effects of the modified example shown in FIGS. 4 and 5 are similar to those of the embodiment shown in FIGS.

As mentioned above, resin spraying is a technique that can repair the sprayed layer B at low cost.
Techniques for repairing the sprayed layer B include, for example, spraying of fiber-reinforced solidification material (spraying of fiber-reinforced mortar), but the resin spraying method can be carried out at a lower cost.
However, at construction sites where cracks in the sprayed layer B are large, spraying of fiber reinforced solidification material is more suitable for repair than the resin spraying method.
FIG. 6 is a flow chart showing a method for selecting an appropriate repair work according to the construction conditions.
6, when there is no cavity on the back surface of the sprayed layer B and the weathered area of the natural ground (back surface natural ground) is small (e.g., less than 0.5 m), the specifications for the reinforcement work of the sprayed layer B are considered in step S1. Then, the process proceeds to step S2.

In step S2, it is examined whether or not a weathered area exists in the back natural ground (slope G). If a weathered area exists (Yes in step S2), the process proceeds to step S3, and if a weathered area does not exist (No in step S2), the process proceeds to step S4.
In step S3 (if a weathered area is present in step S2), a fiber reinforced solidification material spraying work is selected.
In step S4 (if no weathered area is found in step S2), it is examined whether or not there is a through crack that reaches the peeling area and/or the back ground in the sprayed layer B. If there is a through crack that reaches the peeling area and/or the back ground (Yes in step S4), proceed to step S6.
In step S6, it is determined whether it is difficult to deal with the falling of the peeled off portion and/or to carry out water conveyance treatment. In other words, in step S6, it is determined whether it is possible to deal with the case where the peeled off portion and/or the through cracks reaching the back ground are present in the sprayed layer B.
In step S6, if it is difficult to deal with the falling of the peeled portion and/or to conduct water (step S6 is Yes), the process proceeds to step S3, where the fiber reinforced solidification material spraying process is selected. On the other hand, in step S6, if it is not difficult to deal with the falling of the peeled portion and/or to conduct water (step S6 is No), the process proceeds to step S5, where the resin spraying process is selected.
In step S4 (when no weathered area is present in step S2), if there are no peeling areas and/or through cracks reaching the back ground (step S4 is No), the process proceeds to step S5, where resin spraying is selected. That is, if there are no weathered areas in the back ground, no peeling areas in the sprayed layer B, and no through cracks, or if it is not difficult to deal with the falling of the peeling areas and/or to conduct water. In the illustrated embodiment, the method described with reference to Figures 1 to 3 or Figures 4 and 5 is carried out.

In FIG. 6, even if resin spraying work is selected in step S5, if the surface of the sprayed layer to be repaired is wet for some reason (for example, if the moisture content is 10% or more), fiber reinforced solidification material spraying work will be selected instead of the resin spraying method.
In other words, in Figure 6, when there are no weathered areas in the back ground G, when there are no peeling areas and/or through cracks in the sprayed layer B, or when it is not difficult to deal with the falling off of the peeling areas and/or to conduct water, and when the sprayed layer B to be repaired is not wet (for example, when the surface moisture content is less than 10%), the resin spraying method described with reference to Figures 1 to 3 or Figures 4 and 5 is carried out.

It should be noted that the illustrated embodiments are merely examples and are not intended to limit the technical scope of the present invention.
For example, in the illustrated embodiment, the drainage pipe W is installed at the time of construction or the location GW where spring water occurs is shown, but even if the drainage pipe W is not installed or spring water does not occur at the time of construction, in order to guide water in advance, there are cases where the construction is performed at the location where the drainage pipe W is scheduled to be installed or at the location where spring water is likely to occur. In other words, the phrase "the location where the drainage pipe W is installed or the location where spring water occurs in the sprayed layer" is used to include the location where the drainage pipe W will be installed or the location where spring water may occur in the future.

G: Slope (back ground)
B: Sprayed layer (protective layer: mortar layer)
W: Drain pipe SE: Bottom of embankment GW: Spring water location 10: Groove (U-cut)
20: Back surface drainage material 20I: Hollow portion of the back surface drainage material 20E: Longitudinal edge portion of the lower surface portion of the back surface drainage material

Claims (6)

In a resin spraying method in which resin is sprayed onto the surface of a sprayed layer sprayed onto a slope to form a resin layer,
A resin spraying method characterized by placing back drainage material from the drainage pipe installation point or spring water point in the sprayed layer to the foot of the slope. In a resin spraying method in which resin is sprayed onto the surface of a sprayed layer sprayed onto a slope to form a resin layer,
A resin spraying method characterized in that a groove is formed from the drainage pipe installation point or the spring water point in the spraying layer to the foot of the slope, and the groove is formed only in the spraying layer and does not reach the slope ground. The resin spraying method of claim 2, in which the opening of the groove is covered with a coating material. The resin spraying method of claim 3, wherein the coating material is a back surface drainage material. The resin spraying method of claim 2, in which the opening of the groove is not covered with a covering material and a drain hose is placed inside the groove. In cases where there is no weathered area in the back ground of the sprayed layer to be repaired,
When the sprayed layer to be repaired does not have peeling or through cracks several centimeters wide, and the surface moisture content of the sprayed layer to be repaired is less than 10%, the resin spraying method according to any one of claims 1 to 5 is carried out;
This slope repair method is characterized by the fact that when the sprayed layer to be repaired has peeling areas or through cracks several centimeters wide, or when the surface moisture content of the sprayed layer to be repaired is 10% or more, the slope repair method involves spraying a solidifying material containing fibers to carry out the repair.

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