Resin spraying method
The method addresses resin layer peeling by diverting water through a hose connected to a packer in a drain pipe, ensuring the resin application area remains dry, thereby preventing bulging and peeling, and optimizing repair methods for cost-effectiveness.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NITTOC CONSTRUCTION CO LTD
- Filing Date
- 2022-11-18
- Publication Date
- 2026-05-25
AI Technical Summary
Conventional resin spraying methods fail to effectively manage drainage from drainage pipes, leading to resin layer bulging and peeling due to water accumulation at the boundary between the sprayed layer and resin layer, especially when drainage from drainage pipes is inadequate.
A method involving a packer connected to a hose is inserted into a drain pipe, expanding to block water flow within the pipe, diverting it through a hose to the slope toe, ensuring the resin application area remains dry, and using fiber-reinforced solidifying agents when necessary.
Prevents resin layer peeling by maintaining the application area dry, reducing the risk of resin bulging and peeling, and allows for cost-effective repairs by selecting appropriate methods based on site conditions.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a resin spraying method for preventing the intrusion of rainwater and the like from cracks generated in a protective layer made of mortar or concrete sprayed on a slope surface, suppressing deterioration such as salt damage and neutralization of the protective layer, and further preventing the peeling of the protective layer.
Background Art
[0002] A resin spraying method has been proposed in which a resin is sprayed on the surface of a sprayed layer (protective layer: mortar layer) made of mortar sprayed on a slope surface to laminate a resin layer, thereby preventing the intrusion of rainwater and the like from cracks generated in the sprayed layer, suppressing the deterioration of the sprayed layer, and preventing the peeling of mortar pieces (see Patent Document 1). The resin spraying method is an effective technique for repairing the sprayed layer at a low cost.
[0003] However, when the treatment for drainage from the drainage pipe installed in the sprayed layer is inappropriate, as shown in FIG. 7, water W accumulates at the boundary between the surface (BS) of the sprayed layer B and the sprayed resin layer R (resin layer), and the resin layer R bulges. Then, due to such bulging of the resin layer R, there is a risk that the resin layer R will peel off from the sprayed layer B over a wide range. In addition, since the resin film composed of the sprayed resin has low affinity with water, it is difficult to laminate or coat the resin layer R by spraying when the drainage countermeasure from the drainage pipe on the surface of the sprayed layer B is insufficient.
[0004] Here, when the resin spraying method is applied to a sprayed layer from which drainage is being discharged from a drainage pipe, an effective countermeasure against gushing water for the drained sprayed layer has not been proposed conventionally, and in fact, the constructor has been dealing with it at each construction site. That is, in the conventional technology, when the resin spraying method is implemented for a sprayed layer where drainage from a drainage pipe occurs, an effective countermeasure against gushing water has not been proposed.
Prior Art Documents
Patent Documents
[0005] [Patent Document 1] Patent No. 6425204 [Overview of the project] [Problems that the invention aims to solve]
[0006] This invention was proposed in view of the problems of the prior art described above, and aims to provide a resin spraying method that can efficiently guide groundwater generated in the sprayed layer (mortar layer: protective layer) to the toe of the slope without passing through the surface layer of the sprayed layer where resin spraying work is to be performed. [Means for solving the problem]
[0007] The present invention relates to a resin spraying method in which a resin layer (R) is laminated by spraying resin onto the surface of a sprayed layer (B: protective layer or mortar layer) sprayed onto a slope (G), A drainage pipe (1) is provided that penetrates the aforementioned sprayed layer (B) and reaches the slope (G). The process involves inserting a packer (3) connected to a hose (2) into a drain pipe (1) and inflating the packer (3), The resin spraying process, The process includes a step of shrinking the packer (3) after the sprayed resin has hardened, and removing the packer (3) and the connected hose (2) from the drain pipe (1), The hose (2) is characterized by extending from the drain pipe (1) to a point on the toe side of the slope beyond the area to which the resin should be sprayed.
[0008] The slope repair method of the present invention is When there is no weathered area in the ground behind the sprayed layer (B) to be repaired, The resin spraying method (of claim 1) is performed when there are no peeling areas and / or through cracks in the sprayed layer (B) to be repaired, and the surface moisture content of the sprayed layer (B) to be repaired is less than a predetermined value (e.g., less than 10%). The method is characterized by the fact that if there are delamination areas or through cracks in the sprayed layer (B) to be repaired, or if the surface moisture content of the sprayed layer to be repaired is above a predetermined value (e.g., 10% or more), the repair is carried out by spraying a fiber-reinforced solidifying agent (e.g., mortar) (implementing a fiber-reinforced solidifying agent spraying method). [Effects of the Invention]
[0009] According to the present invention having the above-described configuration, When a packer (3) connected to a hose (2) is inserted into a drain pipe (1) and the packer (3) is expanded, the expanded packer (3) will adhere tightly to the inner wall surface of the drain pipe (1), so the water (W) flowing inside the drain pipe (1) will be blocked by the packer (3), and since the packer (3) is connected to the hose (2), the water (W) inside the water pipe (1) will flow inside the hose (2) (arrow WA). Here, since the hose (2) extends to a point on the toe side of the slope beyond the area where the resin is sprayed, the water (W) that flows down inside the hose (2) will not flow into the area where the resin is sprayed, but will flow further to the toe of the slope and be drained, or treated by a wastewater treatment facility installed at the toe of the slope. Therefore, water from the ground (G) does not flow over the area on the surface (BS) of the sprayed layer (B) where the resin is to be sprayed, and the area on the surface (BS) of the sprayed layer where the resin is to be sprayed remains dry. As a result, even when resin is sprayed onto the sprayed layer (B), water does not accumulate at the boundary between the surface (BS) of the sprayed layer and the sprayed resin layer (R), preventing the resin layer (R) from bulging and eliminating the risk of the resin layer (R) peeling off from the sprayed layer (B) over a wide area. Furthermore, since the area of the sprayed layer surface (BS) to which the resin is to be sprayed remains dry, even if the resin film formed by the sprayed resin has low affinity for water, the resin layer (R) will not peel off from the sprayed layer (B).
[0010] The water (W) flowing through the drain pipe (1) flows through the hose (2) connected to the packer (3) (arrow WA), and the water is drained at a point on the toe side of the slope, beyond the area where the resin is sprayed. This condition is maintained until the sprayed resin hardens. After the sprayed resin hardens, if the packer (3) is shrunk and removed from the drain pipe (1), water from the ground (G) will be discharged through the drain pipe (1) and flow over the hardened resin layer (R) (arrow GA: Figure 5). However, since the coating has hardened, even if water flows over its surface, it will not penetrate to the boundary with the sprayed layer surface (BS), so the resin layer (R) will not bulge. Furthermore, since the drainage from the drain pipe (1) does not penetrate the resin layer (R) and does not reach the sprayed layer (B), the resin layer (R) does not peel off from the sprayed layer (B).
[0011] According to the repair method of the present invention, when there is no weathered area in the ground behind the sprayed layer (B) to be repaired, The resin spraying method (of claim 1) is performed when there are no peeling areas and / or through cracks in the sprayed layer (B) to be repaired, and the surface moisture content of the sprayed layer (B) to be repaired is less than a predetermined value (e.g., less than 10%). If there are delaminations or through cracks in the sprayed layer (B) to be repaired, or if the surface moisture content of the sprayed layer (B) to be repaired is above a predetermined value (e.g., 10% or more), the repair is carried out by spraying a fiber-reinforced solidifying agent (e.g., mortar) (the fiber-reinforced solidifying agent spraying method is implemented). Therefore, the appropriate quality repair method can be reliably selected based on the conditions of the construction site, and an over-quality repair method can not be chosen, thus preventing unnecessary costs from being incurred during construction. Furthermore, by selecting a repair method of the appropriate quality, the necessary slope (G) repairs can be carried out. [Brief explanation of the drawing]
[0012] [Figure 1] This is an explanatory cross-sectional view showing the state before the embodiment of the present invention is implemented. [Figure 2]It is an explanatory cross-sectional view showing a state where a packer with a hose is inserted into a drain pipe. [Figure 3] It is an explanatory cross-sectional view showing a state where the packer is inflated. [Figure 4] It is an explanatory view showing a state where resin spraying is being carried out. [Figure 5] It is an explanatory cross-sectional view showing a state after the sprayed resin has hardened. [Figure 6] It is a flowchart showing a mode of selecting an appropriate repair work according to construction conditions. [Figure 7] It is an explanatory view showing problems of the prior art.
Mode for Carrying Out the Invention
[0013] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. In FIG. 1, on the slope of the back ground G to be reinforced, a sprayed layer B (protective layer: mortar layer) formed by spraying and laminating a solidifying material such as mortar, for example, is formed. Holes H are drilled in the sprayed layer B and the ground G. In other words, the holes H penetrate the sprayed layer B from the ground G side and reach the surface BS of the sprayed layer B. And a drain pipe 1 is fitted and installed in the holes H in a so-called interference fit manner, draining the spring water generated in the ground G onto the sprayed layer B. The drain pipe 1 is arranged such that its slope-side end (the left end in FIG. 1) is substantially flush with the sprayed layer B. However, it is also possible to arrange the drain pipe 1 such that its slope-side end is not flush with the sprayed layer B.
[0014] In FIG. 1, since the water from the ground G drained via the drain pipe 1 flows on the surface BS of the sprayed layer B, when resin spraying is performed in the state of FIG. 1, as described above with reference to FIG. 7, water accumulates at the boundary between the surface BS of the sprayed layer B and the resin layer R (see FIGS. 4, 5, and 7) of the sprayed resin, the resin layer R bulges, and there is a risk that the resin layer R peels off from the sprayed layer B over a wide range. Also, the resin coating composed of the sprayed resin has low affinity with water, so the resin layer R peels off from the sprayed layer B.
[0015] In contrast, in the illustrated embodiment, as shown in Figure 2, a packer 3 connected to a hose 2 is inserted into the drain pipe 1 (step of inserting the packer 3 connected to the hose 2 into the drain pipe 1). The packer 3 is connected to a fluid supply system (e.g., an air tube) not shown, and by filling the inside of the packer 3 with fluid (e.g., air), the packer 3 expands as shown in Figure 3 (step of expanding the packer 3), and the packer 3 adheres tightly to the inner wall surface of the drain pipe 1. As shown in Figure 3, when packer 3 expands, it adheres tightly to the inner wall surface of drain pipe 1, so the water W collected by drain pipe 1 is blocked by packer 3. Here, packer P is connected to hose 2, and the water W blocked by packer 3 in drain pipe 1 flows through hose 2 as shown by arrow WA.
[0016] Although not explicitly shown, hose 2 extends to a point on the toe side of the slope (downward in Figures 2 and 3) beyond the area to be sprayed with resin, and drainage occurs from the end of hose 2 at a point on the toe side of the slope (not shown) beyond the area to be sprayed with resin. Alternatively, the water W drained in the area on the toe side of the slope beyond the area to be sprayed with resin is treated by a wastewater treatment facility (not shown) at the toe side of the slope.
[0017] As shown in Figure 3, the water W flowing through the drain pipe 1 is blocked by the packer 3 and flows entirely through the hose 2 to a point on the toe side of the slope beyond the area to be sprayed with resin (arrow WA). Therefore, water W does not flow into the area on the surface BS of the sprayed layer where resin is to be sprayed, and the area to be sprayed with resin remains dry. Therefore, the area on the surface BS of the sprayed layer B where the resin is sprayed remains dry (or even dry), and even when the resin is sprayed, water does not accumulate at the boundary between the surface BS of the sprayed layer B and the sprayed resin layer R, and there is no risk of the resin layer R bulging as shown in Figure 7. Furthermore, there is no risk of the resin layer R peeling off from the sprayed layer B over a wide area. Furthermore, since the area on the surface BS of the sprayed layer to which the resin should be sprayed remains dry, even if the resin film formed by the sprayed resin has low affinity for water, the resin layer R will not peel off from the sprayed layer B. Then, when the resin coating formed by the sprayed resin hardens, it adheres to the surface BS of the sprayed layer B.
[0018] As shown in Figure 4, the resin spraying is performed when the surface BS of the sprayed layer B is not wet, as described above. Whether or not the surface BS of the sprayed layer is wet is determined, for example, by measuring the moisture content of the surface BS using a moisture content checker. If the measured moisture content is below a threshold (e.g., 10%), resin spraying is performed; if it is above the threshold, the process is delayed until the moisture content decreases. Instead of checking the moisture content on the surface BS of the sprayed layer, it is possible to determine whether the surface BS of the sprayed layer B is wet by visually checking the following items. That is, (1) Is there a water flow in the area where the resin should be sprayed? (2) Is there a water-soaked area in the area to be sprayed with resin? (3) Is there ice or snow in the area where the resin should be sprayed? By checking items (1) to (3) in relation to the above, it is possible to confirm whether or not the surface BS of the sprayed layer is wet and to decide whether or not to proceed with resin spraying. Alternatively, by touching the area to be sprayed with resin, it is possible to check whether the sprayed layer surface BS is wet or not, and to decide whether or not to spray the resin.
[0019] In Figure 4, resin is sprayed from the spray nozzle 4 towards the surface BS of the sprayed layer B (arrow 4A) to perform resin spraying (resin spraying process). Resin spraying is carried out so that the thickness of the sprayed resin is uniform across the entire area to be sprayed. In Figure 4, resin spraying is performed from above, and a resin layer R is laminated in the area where resin spraying has been performed. Even while the resin spraying is in progress, the water W in the drain pipe 1 flows down through the hose 2 (arrow WA) and is drained at a point closer to the toe of the slope than the area where the resin is being sprayed, so it does not flow over the surface BS of the sprayed layer B. After the resin spraying is completed over the entire area to be sprayed, the packer 3 remains expanded until the sprayed resin layer R hardens, thereby maintaining the state in which water collected in the drain pipe 1 flows through the hose 2 (Figure 4).
[0020] Although not explicitly shown in Figure 4, the hose 2 is positioned away from the spray layer B so that it does not extend into the space between the spray nozzle 4 and the spray layer B during resin spraying. This is to prevent the sprayed resin from hitting hose 2 and not being sprayed onto spray layer B, thus preventing an uneven thickness of the resin.
[0021] Once the resin spraying shown in Figure 4 is complete and the resin layer R has hardened (solidified) over time, the packer 3 is shrunk, and the packer P and connected hose 2 are removed from the drain pipe 1 as shown in Figure 5 (the process involves shrunk the packer 3 after the sprayed resin has hardened, and then removing the packer 3 and connected hose 2 from the drain pipe 1). In the process shown in Figure 5, a uniform resin layer R is already laminated in the area of the surface BS of the sprayed layer B where the resin is to be sprayed. Since the resin layer R covering the surface BS of the sprayed layer B has already hardened, even if water from the ground G is drained from the end of the drainage pipe 1 on the sprayed layer surface side (left end in Figure 5), it only flows over the surface of the hardened resin layer R (arrow GA), and water does not accumulate at the boundary between the surface BS of the sprayed layer B and the sprayed resin layer R, nor does water penetrate to this boundary. Therefore, the resin layer R does not bulge, and the resin layer R does not peel off from the sprayed layer B. Then, the sprayed layer B is repaired by the resin layer R.
[0022] As mentioned above, resin spraying is a technique that allows for the repair of sprayed layer B at a low cost. While other techniques for repairing sprayed layer B include, for example, fiber-reinforced solidification spraying (fiber-reinforced mortar spraying), the resin spraying method can be implemented at a lower cost. However, in construction sites where large cracks have formed in sprayed layer B, the fiber-reinforced solidifying agent spraying method is more suitable for repair than the resin spraying method. Figure 6 shows a flowchart illustrating a method for selecting appropriate repair work according to construction conditions. In the flowchart of Figure 6, if there are no voids behind the sprayed layer B to be repaired, and the weathered area of the ground G (background) is small (for example, less than 0.5m), then in step S1, the specifications for the reinforcement work of the sprayed layer B are considered. Then the process proceeds to step S2. If there is a void behind the sprayed layer B to be repaired, or if the weathered area is large (for example, 0.5 m or more), it is determined that the repair method selection method shown in the flowchart of Figure 6 does not apply, and the resin spraying method is not adopted. Instead, the adoption of fiber-reinforced solidification spraying or other methods is considered. In other words, if there is a void behind the sprayed layer B to be repaired, or if the weathered area is large (for example, 0.5 m or more), the fiber-reinforced solidification spraying or other repair methods are considered without performing the examination in step S1.
[0023] In step S2, it is examined whether a weathered area (in this case, a small weathered area of less than 0.5m) exists in the ground behind the sprayed layer B to be repaired (slope G). As mentioned above, if a weathered area of 0.5m or more exists, for example, it is determined that it is outside the scope of the selection method shown in Figure 6, and fiber-reinforced solidification spraying or other repair work is considered, and steps S1 and S2 are not performed. In step S2, if a weathered area exists (for example, a small area less than 0.5m) (step S2 is "Yes"), proceed to step S3; otherwise, proceed to step S4. In step S3 (if weathered areas exist in step S2), a fiber-reinforced solidification spraying method (a repair method that involves spraying a solidification material containing fibers (e.g., mortar)) is selected. In step S4 (if no weathered areas exist in step S2), it is examined whether there are any through cracks (for example, through cracks several centimeters wide) in the sprayed layer B to be repaired that reach the delamination area and / or the backfill ground. If, in step S4, there are through cracks that reach the delamination area and / or the backfill ground (if step S4 is "Yes"), proceed to step S6. On the other hand, if there are no through cracks (for example, through cracks several centimeters wide) reaching the delamination area and / or the backfill ground in step S4 (step S4 is "No"), proceed to step S5. Step S6 determines whether it is necessary to address the falling of the delamination portion and / or whether water drainage treatment is difficult. In other words, Step S6 determines whether it is possible to address the issue even if there are through cracks in the sprayed layer B that reach the delamination portion and / or the backfill ground. If, in step S6, it is difficult to deal with the falling of the peeled-off section and / or water drainage treatment is difficult (step S6 is Yes), proceed to step S3 and fiber-reinforced solidification spraying is selected. On the other hand, if, in step S6, it is possible to deal with the falling of the peeled-off section and / or water drainage treatment is possible (step S6 is No), proceed to step S5 and resin spraying is selected. Here, if in step S4 (when no weathered area exists in step S2) there are no through cracks (e.g., through cracks several centimeters wide) reaching the delamination area and / or the backfill ground (step S4 is "No"), or if in step S6 it is possible to deal with the falling of the delamination area and / or water drainage treatment is possible (step S6 is "No"), then in step S5 resin spraying is selected and the resin spraying method described in Figures 1 to 5 is carried out. In other words, if there is no weathered area in the backfill ground G, no delamination area and no through cracks in the sprayed layer B, or if it is possible to deal with the falling of the delamination area and / or water drainage treatment is possible, then resin spraying is selected and the method described with reference to Figures 1 to 5 is carried out.
[0024] In Figure 6, even if resin spraying is selected in step S5, if the surface of the sprayed layer to be repaired is wet for any reason (for example, if the moisture content is 10% or more), then fiber-reinforced solidification spraying will be selected instead of resin spraying. In other words, in Figure 6, if there are no voids and / or weathered areas in the backfill ground G, and there are no peeling sections and / or penetrating cracks in the sprayed layer B, or if it is not difficult to deal with the falling of peeling sections and / or to drain water, and the sprayed layer B to be repaired is not wet (for example, if the surface moisture content is less than 10%), then the resin spraying method shown in Figures 1 to 5 is implemented. By selecting the appropriate repair method using the flowchart in Figure 6, it is possible to reliably select a repair method of the required quality for the construction site conditions, without choosing a repair method of excessive quality. Therefore, it is possible to carry out slope repair of appropriate quality while preventing the expenditure of unnecessary costs during construction.
[0025] The illustrated embodiments are for illustrative purposes only and are not intended to limit the technical scope of the present invention. [Explanation of Symbols]
[0026] 1. Drain pipe 2. Hose 3. Packer B...Sprayed layer (protective layer: mortar layer) G...Slope (natural ground) R...Resin layer
Claims
1. In a resin spraying method in which resin is sprayed onto the surface layer of a sprayed layer applied to a slope to create a layer of resin, A drainage pipe is provided that penetrates the aforementioned sprayed layer and reaches the slope. The process involves inserting a packer connected to a hose into the drain pipe and inflating the packer, The resin spraying process, The process includes a step of shrinking the packer after the sprayed resin has hardened, and removing the packer and the connected hose from the drain pipe. The resin spraying method is characterized in that the hose extends from the drainage pipe to a point on the toe side of the slope, beyond the area to be sprayed with resin.
2. When there is no weathered area in the ground behind the sprayed layer to be repaired, The resin spraying method of claim 1 is performed when there are no peeling areas and / or through cracks in the sprayed layer to be repaired, and the surface moisture content of the sprayed layer to be repaired is less than a predetermined value. A slope repair method characterized by applying a fiber-containing solidifying agent to repair a sprayed layer if there are delamination areas or through cracks in the sprayed layer to be repaired, or if the surface moisture content of the sprayed layer to be repaired is above a predetermined value.