JP3616209B2 - Water leakage prevention structure for underground excavation holes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water leakage prevention structure in an underground excavation hole used for waste disposal or the like.
[0002]
[Prior art]
As a waste disposal method, there is a method of embedding waste in a hole deeply excavated in the ground. In the underground excavation hole, measures are taken to prevent water leakage so that dirty water, etc. from the buried waste penetrates into the underground and does not cause environmental damage. However, water leakage sometimes occurs, and in such a case, in order to block the flow of the water leakage, a sheet pile or the like is placed and processed.
[0003]
[Problems to be solved by the invention]
However, when placing a sheet pile or the like, preparation and work including loading of equipment and the like is time-consuming and it is difficult to take a quick response. Even if the location of water leakage is small at the beginning, it may expand over time and become untouchable. Early repair is desired while the leak location is small. In addition, the placement of sheet piles that require equipment inevitably increases the work scale and increases the construction costs.
Also, it is not easy to specify the location of the water leakage if it is in the underground excavation hole where waste is buried, and it may take time to specify and damage may be increased. In addition, if the underground excavation hole is deep even if the leak location is specified, the repair itself is practically impossible, and there are cases where the transfer of the buried location should be considered.
Therefore, the present invention has been proposed in view of the above problems, and while stopping water leakage as much as possible at the initial stage of occurrence without human intervention, even if the water leakage cannot be stopped, the amount of water leakage is determined until the location and repair of the water leakage location. The purpose is to develop technology that can suppress the leakage damage and prevent it from spreading.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is a structure for preventing leakage of underground excavation holes used in waste disposal or the like, and includes water under the leakage preventing surface in the underground excavation holes. A curable material layer was provided.
Furthermore, the invention according to claim 2 is the invention according to claim 1, wherein the water curable material layer is provided on the ground surface of the location where water leakage prevention is necessary in the underground excavation hole via a non-permeable member, A water leakage preventing surface was formed on the water curable material layer.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein a predetermined amount of cement powder is wrapped with a packaging material having a water-permeable portion in at least a part thereof. A cement wrap was formed by laying a plurality of the water-permeable portions toward the back surface of the water leakage preventing surface.
[0005]
In the water leakage prevention structure having the above-described structure, a water curable material layer having a water leakage prevention surface formed thereon is provided on the ground surface where the water leakage prevention of the underground excavation hole is necessary. Normally, water leakage is prevented by the water leakage prevention surface, but in the unlikely event that water leaks due to a hole in the water leakage prevention surface, etc., the water curable substance reacts with the leaked water to cure and leak. Can be stopped. If the water leakage scale is small, the water leakage can be stopped in the initial state. In addition, even if the water leakage scale is large and cannot be completely stopped, the amount of water leakage can be suppressed by hardening the water curable material, so that the damage to the water leakage can be kept to a minimum until the location and repair of the water leakage location.
[0006]
Further, if the water curable material layer is provided on the ground surface through the water-impermeable member, the moisture in the ground of the underground excavation hole is not absorbed and cured. As such a water curable substance, for example, cement can be used. Moreover, the conventional water leak-proof sheet can be used for formation of this water-impermeable member and a water leak-proof surface, for example.
In addition, when forming the water-curable material layer, a cement wrap in which a predetermined amount of cement powder is at least partially wrapped with a wrapping material having a water-permeable portion is taken as one unit, directly or non-water-permeable on the ground surface. A plurality of layers may be formed through members. If measures are taken to spread multiple cement wraps, cement powder will not flow, especially when applied to slopes in underground drilling holes, even when forming a water-curable material layer using cement powder over a large area. Easy to perform the forming work.
[0007]
Furthermore, since the cement wrap is laid so that the water-permeable portion of the wrapping material faces the back side of the water leakage prevention surface, the water leakage that has passed through the water leakage prevention surface immediately causes a hydration reaction with the cement powder, and promptly Can be used to stop water.
The formation of the water curable material layer may be performed basically by any work as long as the function of hardening by reaction with water and the function of stopping water leakage can be secured. However, if a plurality of wrappings with a predetermined amount of water-curable material wrapped with a wrapping material, such as the above-mentioned cement wrapping, are laid directly on the ground surface or through a non-permeable member surface, Easy to do.
The packaging material may be a flexible material or a hard material. Form a flexible packaging material in the shape of a bag and fill it with a water-curable material such as cement powder. Even if there are some irregularities or curved surfaces on the mating area, it will be in the shape of the mating area. Workability is good because it can be flexibly deformed along the way. In addition, in the case of small unevenness at the place where the sheet is laid, it is not necessary to generate unnecessary unevenness or gaps on the surface where the packet is laid. On the other hand, if the wrapping is formed in a fixed block shape with a hard wrapping material, the workability is better in the flat portion or the like than in the above case.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the water leakage prevention structure of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the water leakage prevention structure of the present embodiment is applied to an underground excavation hole provided in the ground at a predetermined depth. In the present embodiment, a commercially available water leakage prevention sheet is laid as the water-impermeable member 10 on the entire ground surface of the underground leakage hole where the underground excavation hole is excavated in a substantially mortar shape.
Further, a water curable material layer 20 having a predetermined layer thickness using a cement powder that is solidified with water as a water curable material is formed on the surface of the water impermeable member 10, and a water leakage preventing surface 30 is formed thereon. ing. What is necessary is just to set the layer thickness of the water-curable material layer 20 suitably according to the amount of water leaks to be worried about.
[0009]
For example, on the upper vertical surface side away from the bottom surface side of the underground excavation hole, water leakage is unlikely except for using the underground excavation hole for water storage. Can be made thinner. For example, when cement powder is used, there may be a case where the powder is thinly dispersed.
However, since the probability of water leakage is high and the water pressure at the time of water leakage is expected to increase at the bottom surface and the side close thereto, the water curable material layer 20 must be thicker than the above case.
In the present embodiment, the water curable material layer 20 using cement powder is formed by laying a cement wrap 40 in which a predetermined amount of cement powder is wrapped with a wrapping material on the surface of the water-impermeable member 10 as shown in FIG. Is formed. The cement wrap 40 may be formed into a regular, substantially block shape using a hard wrapping material as shown in FIG. 2 (a), or a flexible wrapping as shown in FIG. 2 (b). The material may be formed in a substantially bag shape so that it can be deformed flexibly.
[0010]
For example, the regular block-shaped cement wrap 40 is suitable for use on a flat bottom surface or a flat slope as shown in FIG. On the other hand, in the case of using the surface having a large curvature as shown in FIG. 1 or the addressing of the corner portion as shown in FIG. 3B, the cement wrap 40 formed so as to be deformable by a flexible wrapping material. Is easier to use.
In any case, a part of the packaging material of the cement wrap 40 is formed in a water-permeable portion 41 (indicated by hatching in the drawing) as shown in FIGS. 2 (a) and 2 (b). In this embodiment, the packaging material is formed of a non-permeable material, and only the permeable portion 41 is made of another material that is permeable to water.
As the hard water-impermeable packaging material, for example, a hard plastic can be used, and as the flexible packaging material, for example, a thin-film packaging material such as a polyethylene sheet can be used. In addition, a water-permeable thin film material or a fine mesh material that does not generate cement powder may be used for the water-permeable portion.
[0011]
In the present embodiment, the cement wrap 40 having the above-described form using a hard or flexible wrapping material is appropriately selected, and the water-permeable portion 41 is spread on the surface of the water-impermeable member 10 so as to face upward. A water leakage preventing surface 30 is formed on the water curable material layer 20 formed in this manner, and the back surface thereof is in surface contact with the water permeable portion 41.
The water leakage prevention surface 30 may be formed by providing a water-impermeable member on the upper surface of the water curable material layer 20. In the present embodiment, a water leakage prevention sheet similar to that used in the water impermeable member 10 is laid on the upper surface of the water curable material layer 20.
Further, when laying the cement wrap 40, the cement wrap 40 may be stacked and laid in a plurality of stages.
Thus, in this embodiment, the water leakage preventing sheet is used to form the water-impermeable member 10 and the water leakage preventing surface 30 on the entire ground surface in the mortar-shaped underground excavation hole, and cement powder is interposed between them. There is provided a water leakage prevention structure comprising a water curable material layer 20 sandwiching.
[0012]
In the above embodiment, the water-impervious member 10 or the water leakage preventing sheet used for forming the water leakage preventing surface 30 may be used singly or in a stack of two or more.
In the above embodiment, the water leakage prevention structure has been described as being applied to the entire ground surface of the underground excavation hole. However, when the location where there is a risk of water leakage can be limited to a specific range such as a part of the bottom surface, the entire ground surface However, it is possible to construct only that portion without applying the water leakage prevention structure.
In the above embodiment, the water curable material layer 20 is formed using the cement wrap 40. However, in the case of a small underground excavation hole or the like, the water-impermeable portion of the wrapping material on the back side of the cement wrap 40 is used. The water curable material layer 20 may be formed by laying directly on the ground surface. The formation of the water leakage preventing surface 30 may be formed as described above. Such a state is shown in FIG. In this way, the structure of the water-impermeable member 10 can be substituted with the water-impermeable portion of the packaging material of the cement wrap 40, and the trouble of interposing the water-impermeable member 10 can be saved at a small-scale site or the like. Construction time can be shortened and construction costs can be reduced.
[0013]
In the above embodiment, the water curable substance layer 20 is formed so as to cover the cement wrap 40 in which a predetermined amount of cement powder is wrapped in a wrapping material, but may be formed by other methods.
As another embodiment of the water curable material layer 20, a water-impervious member is provided with a water leakage preventing sheet in which a large number of raised protrusions having a length matching the layer thickness of the water curable material layer 20 are formed on the surface. The water curable material layer 20 may be formed on the sheet surface by spreading cement powder on the sheet surface to the height of a small protrusion and pressing the cement powder. Since the cement powder is compacted and fastened by a large number of small protrusions, the water curable material layer 20 using the cement powder can be formed with this configuration on a relatively gentle slope.
Furthermore, if the small protrusions as described above are provided on the back side of the water leakage preventing surface 30 and the water leakage preventing surface 30 is formed so as to mesh with the small protrusions on the surface of the water-impermeable member 10, the cement powder is more It is hard to move. Such a state is shown in FIG.
[0014]
Alternatively, as shown in FIG. 5 (b), a pair of water-impermeable sheets having a predetermined area face each other at predetermined intervals via a partition that defines the sheet surface into small sections, and the small section portions The water curable material layer 20 may be formed so as to be filled with cement powder. In such a configuration, one surface sandwiching the water curable material layer 20 can be used as the water-impermeable member 10, and the other surface can be used as the water leakage preventing surface 30, and these are integrated. For this reason, it can be formed in advance in a unit area or the like having a constant area in factory production or the like, and the construction work on the site becomes easier.
Furthermore, when it is sufficient to reduce the thickness of the cement powder layer, as shown in FIG. 5 (c), a thin cement powder layer is sandwiched between the water-impermeable films, and both films are pressure-bonded. It doesn't matter. When crimping, if a crimped partition is provided, such as quilting stitching, the cement powder will not move. If formed into a thin shape in this way, it can be used, for example, in a building structure part such as a lower part of a bathroom floor on an upper floor of a condominium or the like or a wall surface other than an underground excavation hole.
In addition, as shown in FIGS. 5 (a), (b) and (c), the upper and lower members sandwiching the cement powder can be used not only on the plane but also along the situation. Because it is possible, workability is better. Further, a plurality of layered structures shown in FIG. 5 may be stacked.
[0015]
As the water curable substance, the case where cement powder is used has been described in the above description. However, a substance other than cement powder may be used as long as it is suitable for the purpose. In use, in the same way as the above cement powder, the material should not flow so that the predetermined layer thickness can be maintained in consideration of application to slopes, etc., and it should not be in direct contact with moisture on the ground surface. It is sufficient to consider this.
For example, similar to the construction of the cement wrap 40, such a water curable substance may be wrapped with an appropriate wrapping material to form a wrap, and these may be spread. Or you may use with a form as shown in FIG.
[0016]
The water leakage prevention structure described in the above embodiment can be applied to a water leakage prevention portion of an underground excavation hole that requires various types of water leakage prevention, such as for waste burying treatment or simple water storage.
Moreover, in the said embodiment, although the water leak prevention sheet | seat conventionally known as the water-impermeable member 10 was used, it is not necessary to limit to this at all, and a metal material, a resin material, etc. are formed in water-impermeable. Any member can be used. In forming the water leakage preventing surface 30, a member made of a material other than the water leakage preventing sheet can be used in the same manner as the water-impermeable member 10.
Furthermore, in the said embodiment, although the case where a part of cement wrap was formed in the water-permeable part was shown, you may make the whole packet water-permeable. In such a case, as long as the upper and lower sides of the wrapping are sandwiched between impermeable members as in the above-described embodiment, there is no problem because moisture absorption or the like directly in the ground can be avoided. In particular, if the cement wrap having such a configuration is used in the above embodiment of the underground excavation hole, water leakage from the underground excavation hole can be prevented, and in the unlikely event of groundwater from the ground side into the underground excavation hole, etc. It can also be prepared for water seepage.
[0017]
【The invention's effect】
According to the present invention, since a water curable material layer (for example, a cement layer) is formed under the water leakage preventing surface, when water leaks, the leaked water and the water curable material are Because it reacts and cures immediately, water leakage is automatically stopped without human intervention.
In addition, even in the case of a large-scale water leakage accident that cannot completely prevent water leakage, the amount of water leakage can be suppressed as much as possible until the location and repair of the water leakage location, thereby preventing damage to the water leakage to a minimum.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view (a) of an underground excavation hole showing an application situation of the present embodiment, and a partially enlarged view (b) of a water leakage prevention structure portion surrounded by a circle in (a).
FIGS. 2A and 2B are perspective views showing a cement wrap used in the present embodiment.
FIG. 3 is a cross-sectional view (a) showing an application of the present embodiment to a slope portion, and a partial cross-section showing a situation where a cement wrap using a flexible wrapping material is used for a bottom corner portion of an underground excavation hole. FIG.
FIG. 4 is a cross-sectional view showing a state in which a cement wrap is laid directly on the ground surface in an underground excavation hole.
FIG. 5 is a cross-sectional view (a), (b), (c) showing another embodiment of a water curable material layer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Water-impermeable member 20 Water curable substance layer 30 Water leakage prevention surface 40 Cement wrap

Claims (1)

During under water leakage prevention surface of the downhole earth, cement packaging consisting wrapped a predetermined amount of cement powder in packaging material having a water permeable portions at least in part, toward the water permeable portion on the back surface of the leakage prevention surface more laying water-curable material layer formed by the water leakage in the underground wellbore, characterized in that it is provided via the non-permeable member on the ground surface of the leakage prevention necessary part of the underground downhole Prevention structure.

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