JP4852673B2 - How to protect waterways - Google Patents

Description

  The present invention provides a resin layer on the surface of the water channel (the inner surface of the water channel that may come into contact with the water flow) in order to prevent wear and damage to the water channel due to the water flow including earth and sand and to reduce resistance to the water flow. It relates to the forming technology.

  Conventionally, a general water channel has a problem of being worn by contaminants contained in the water flow. Thus, urethane resin (polyurea resin) may be applied and sprayed on the surface of the water channel. By doing so, the resistance to water flow can be reduced. Such a urethane resin spraying operation is performed after first cleaning the spray surface of the water channel and applying a primer.

  However, in the conventional method of spraying resin as described above, when a part of the resin layer is worn or damaged by the impact of earth and sand mixed in the water flow, the part is peeled off. In this way, when a part of the resin layer is peeled off, there is a problem that the water flow enters between the resin layer and the surface of the water channel and is peeled off one after another.

  In view of the above problems, the present invention has been made for the purpose of proposing a construction method in which even if a part of a resin layer is peeled off, it is not peeled off one after another.

The invention according to claim 1
In the method for protecting a water channel that protects the water channel by forming a resin layer on the surface of the water channel, a resin layer that covers the surface of the water channel is formed by spraying and applying a resin, and a slit-like cut is formed in the resin layer. It is characterized by providing.
In claim 2,
A plurality of closed regions surrounded by the slit-like cuts provided in the resin layer are formed.
In claim 3,
The resin layer is characterized in that a groove is provided on the surface of the water channel, and then the resin is sprayed and applied to fill the resin into the groove and cover the surface of the water channel.

In claim 1 of the present invention, since the slit-like cut is provided in the resin layer, the resin layer breaks at the slit-like cut even if the resin layer upstream of the slit-like cut is peeled off, Peeling to the downstream side of the slit-like cut can be suppressed.
In this way, the peeling that has occurred on the upstream side of the slit-like cut is prevented from being transmitted to the downstream side, so that the peeling portion can be minimized.
Therefore, the protective effect by the resin layer is maintained for a long time.
In claim 2, since the plurality of closed regions surrounded by the slit-like cuts provided in the resin layer are formed, the peeling that occurs inside the closed region goes out of the closed region. Is not transmitted. Further, since the peeling generated outside the closed region is not transmitted to the inside of the closed region, the protective effect by the resin layer is maintained for a long period.
In claim 3, in addition to the effect that even if peeling occurs on the upstream side of the slit-like cut due to the slit-like cut as in claims 1 and 2, the peeling does not propagate to the downstream side. Since the layer is filled up to the inside of the groove provided on the surface of the water channel, the adhesive force between the resin layer and the surface of the water channel is increased, and peeling itself is difficult to occur.

It is a partial perspective view of a waterway provided with a groove. It is sectional drawing to which a part of FIG. 1 was expanded. It is a figure explaining the method of peeling strength measurement. It is a graph which shows the relationship between the peeling load and peeling length in peeling strength measurement. It is the figure which showed the various planar shape of a groove | channel. It is a partial sectional view of a waterway to which a waterway protection method according to the present invention is applied.

Below, the method of this invention is demonstrated in detail based on drawing of the waterway to which the method is applied.
First, with reference to FIGS. 1-5, although it is outside the technical scope of Claim 1 of this invention, it demonstrates regarding the protection method of the water channel which provided the groove | channel on the surface of the water channel.

FIG. 1 is a partial perspective view of a water channel.
In FIG. 1, a water channel 1 is a water channel for discharging a dam and is constructed of concrete. A urea resin U is sprayed on the surface of the water channel 1 to form a resin layer 2 for protection. In spraying the urea-based resin, the groove 3 is formed on the surface of the water channel. In forming the groove 3, the groove 3 may be cut or a protrusion may be formed on the mold. And the foundation | substrate 4 used as a spraying surface is cleaned. Thereafter, a primer 5 is applied to ensure adhesion between the base 4 and the resin layer 2. On top of this, a urea resin U is sprayed to form a resin layer 2 of about 3 mm to 10 mm.

  In spraying the urea-based resin, a resin layer is formed by spraying and applying the sprayed urea-based resin to the surface of the primer-treated water channel using a small nozzle. . As the urea resin, urea urethane resin and polyurea urethane resin can be used. These urea-based resins can be cured in a few tens of seconds to several minutes after spraying, so that sufficient strength is obtained, so that almost no curing time is required, and they can be used in a short time after spraying.

  The urea-based resin is a polymer having a urea bond formed by a reaction between an amine-containing compound and isocyanates, and the reaction rate is very fast and cures in several tens of seconds to several minutes. In addition, performance degradation with time is small, and stable protection performance is maintained over a long period of time. It also has high chemical resistance. Furthermore, it has elasticity that can sufficiently follow cracks, displacement of the base, and the like. The test results of the urea resin layer are as follows: Tensile strength: 10 to 20 MPa (test method JIS K 6301), elongation: 300 to 500% (test method JIS K 6301), tear strength: 490 to 970 N / cm (test method JIS K 6301) , Hardness 80 ~ 97 (JIS A) (Test method JIS K 6301)

FIG. 2 is a cross-sectional view showing a cross section in which a part of the water channel is cut in the direction of the water flow in order to explain the groove provided on the surface of the water channel.
As shown in FIG. 2, grooves 3 formed in a direction perpendicular to the water flow are formed at appropriate intervals on the surface of the water channel 1. The cross-sectional shape of the groove 3 is rectangular, and when the thickness of the urea resin layer is 3 mm, the width W of the groove is about 10 mm, and the depth D of the groove is at least twice the thickness of the urea resin layer. Is preferred. This is also clear from the peel strength measurement results shown in Table 1 below.

  The peel strength measurement in Table 1 was performed by the test method as shown in FIG. 3A based on the floating roller method peel test specified in JIS K 6854, and the test speed was 100 mm / The measurement temperature was 21 to 23 ° C. for min. In Table 1, “average flat portion” of peel strength indicates the average peel load in “flat portion” in FIG. 4, and “peak (break)” is “peel peak or break” in FIG. 4. The load at is shown.

  For example, as shown in Table 1, when the depth of the groove is 7.5 mm and the width is 10 mm, in cases 4 and 5, after the resin layer peels up to the groove portion, FIG. As described above, the resin layer was broken. However, in case 6 under the same conditions, it is shown that the resin layer was peeled off as shown in FIG. When the depth of the groove was 10 mm or more, even if the resin layer had a thickness of about 3 mm, the resin layer was broken after peeling to the groove portion. Therefore, if the depth of the groove is about 2.5 (≈7.5 / 3.03) times or more than the thickness of the resin layer, it is possible to prevent the separation of the resin layer generated on the upstream side of the groove from spreading to the downstream side of the groove. It can be said.

  In this way, by providing a groove on the surface of the water channel and spraying the resin, the resin filled in the groove acts as an anchor for the resin layer on the surface of the water channel. Peel strength was obtained. Since such a peel strength is obtained, even if the resin layer peels on the upstream side of the groove, it is prevented from peeling to the downstream side of the groove. Therefore, the protective effect of the water channel by the resin layer is maintained over a long period of time.

As shown in FIGS. 5A to 5D, various shapes can be realized as the planar shape of the groove. Then, by forming a plurality of closed regions R surrounded by grooves, the periphery of the closed region R adheres to the surface of the water channel with sufficient adhesion strength and does not easily peel off. Further, even if the closed region is peeled off, the peeling is not spread to the surrounding region by the surrounding groove, so that the resin layer is protected. Further, the cross-sectional shape of the groove is not limited to a rectangular shape, and may be a V shape or a parallelogram shape.

Next, a method for protecting a water channel according to the present invention will be described with reference to FIG. 6 showing a partial cross-sectional view of a water channel in which a slit-like cut is provided in a resin layer on the surface of the water channel.
As shown in FIG. 6, the present invention is characterized in that slit-like cuts S are formed in the resin layer 2 formed on the surface of the water channel.
The cut S prevents the separation generated on the upstream side from extending beyond the slit S to the downstream side.

As shown in FIG. 6A showing the cross-sectional view of Example 1, slit-like cuts S are formed in the resin layer 2 formed on the surface of the water channel, and the resin layer 2 is a groove provided on the surface of the water channel. It is good to fill up to the inside of 3.
The resin layer 2 is formed so as to fill the resin into the groove 3 and cover the surface of the water channel by providing a groove 3 on the surface of the water channel and then spraying and applying resin. . As described above with reference to FIGS. 1 to 5, the resin layer 2 is hardly peeled by filling the groove 3 with the resin.

In particular, as shown in FIG. 6A, by providing a slit S in the resin layer 2 on the upstream side of the groove 3 provided on the surface of the water channel, the resin layer 2 can be peeled on the upstream side. Even if it occurs, it can be almost surely stopped from spreading to the downstream side by the slit-shaped cut S.
Further, as shown in FIG. 6A, it is preferable that the end 51 on the most upstream side of the resin layer 2 is embedded in a groove 52 provided on the surface of the water channel or covered with an iron plate 53 or the like.

Example 2
As shown in FIG. 6B showing a cross-sectional view of Example 2, slit-like cuts S are formed in the resin layer 2 formed on the surface of the water channel, and the resin layer 2 is a groove provided on the surface of the water channel. 3 is preferably filled, and the end portion on the most upstream side of the resin layer 2 is preferably processed obliquely.

Although FIG. 6 shows an example in which both the slit-like cut S of the resin layer 2 and the groove 3 on the surface of the water channel are provided, even if only the slit-like cut S of the resin layer is generated, it is generated upstream. It is possible to suppress spreading of the peeled resin layer to the downstream side.
And if the closed region surrounded by the slit-like cut S provided in the resin layer 2 is formed, it is possible to suppress the upstream peeling from spreading to the downstream side as in the case of the groove provided in the water channel. is there.

  The slit-like cut S provided in the resin layer may be a depth to the surface of the water channel, or may be in a state in which some resin layer is left at the bottom of the cut. In any case, it is only necessary that the resin layer is easily broken at the slit-shaped break S.

  The water channel may be made of concrete or steel. And although the resin layer may be formed by spraying etc. at the construction site of the water channel, the resin layer may be formed in advance on the water channel constituting segment such as concrete in the factory, and those segments may be assembled at the construction site. Good. Moreover, the form of the water channel may be an open channel with an open top or a channel such as a culvert or a conduit. In any case, a resin layer may be formed and protected in a portion that may come into contact with the water flow.

The resin layer formed as described above has excellent chemical resistance and wear resistance. Moreover, since construction at a low temperature is possible, it is suitable not only for newly established water channels, but also for repairing existing water channels with poor working conditions. The resin may be an epoxy resin or a urethane resin.

1 Waterway 2 Resin layer 3 Groove 4 Base 5 Primer U Urea resin S Slit cut

Claims (3)

  In the method for protecting a water channel that protects the water channel by forming a resin layer on the surface of the water channel, a resin layer that covers the surface of the water channel is formed by spraying and applying a resin, and a slit-like cut is formed in the resin layer. A method for protecting a waterway, characterized by comprising:   The water channel protection method according to claim 1, wherein a plurality of closed regions are formed that are surrounded by the slit-like cuts provided in the resin layer. The resin layer is formed so as to fill a resin into the groove and cover the surface of the water channel by providing a groove on the surface of the water channel and then spraying and applying resin. Item 3. The method for protecting a water channel according to any one of Items 1 and 2.

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