Watertight structure around the site

Abstract

To provide a site perimeter water cut-off structure capable of suppressing the rise of a water level in a banking even when water rushing to a perimeter of a retaining wall infiltrates into the ground and enters the banking from the lower side of the retaining wall.SOLUTION: A site perimeter cut-off structure 100 is provided with a retaining wall 1 for receiving the lateral pressure of banking 102, a water cut-off fence 2 having a height higher than that of the retaining wall 1 and installed on the outer perimeter side of the retaining wall 1 so as to be separated from and opposed to the retaining wall 1, and drain means (a drain ditch 3 and a water-storage space 103) for receiving and draining water from a drain hole 11a of the retaining wall 1 between the retaining wall 1 and the water cut-off fence 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a site surrounding water stop structure that can prevent water from rushing around the site and flooding the site. [Background technology]

[0002] A known conventional technique for preventing water from rushing around the perimeter of a site and flooding the site is to install a water cut-off wall around the perimeter. Another possible method is to install a water cut-off wall on top of a retaining wall that receives the lateral pressure of the embankment, in order to prevent flooding at a water level higher than the retaining wall.

[0003] Patent document 1 discloses a multiple water blocking wall that is arranged in two or more layers at intervals in the wall thickness direction, and that is equipped with drainage means for discharging water that has seeped between the water blocking walls to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6516946 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the above-mentioned water-stop structure, there is a risk that water will seep into the ground over time and seep into the site from below the water-stop wall. Also, with the above-mentioned water-stop structure where an additional water-stop wall is installed on top of the retaining wall, water will seep into the ground over time and seep into the site from below the retaining wall, and water will also seep into the embankment from the drainage holes in the retaining wall.

[0006] It should be noted that the multiple cut-off wall disclosed in Patent Document 1 is not a combination of a cut-off wall (water barrier) and a retaining wall.

[0007] The object of this invention is to provide a water-stopping structure around a site that can suppress the rise in the water level of flooding in the embankment even if water surges around the retaining wall seeps into the ground and floods into the embankment from below the retaining wall. [Means for solving the problem]

[0008] The water-stop structure around a site of this invention is characterized by comprising a retaining wall that withstands the lateral pressure of the embankment, a water-stop fence that is taller than the retaining wall and is installed facing the retaining wall at a distance from the retaining wall on the outer periphery of the retaining wall, and drainage means that receives water from the drainage holes in the retaining wall and drains it between the retaining wall and the water-stop fence.

[0009] With the above-mentioned configuration, even if water seeping into the ground seeps in from the underside of the water cut-off wall and the retaining wall and rises in the embankment, the drainage means can receive and drain this water through the drainage holes in the retaining wall, thereby preventing water from rising in the embankment above the height of the drainage holes due to water seeping in from the ground.

[0010] A load transfer member may be provided between the retaining wall and the water cut-off wall to transfer the water pressure acting on the water cut-off wall to the retaining wall. This reduces the load borne by the water cut-off wall compared to a structure in which the water cut-off wall alone bears the water pressure acting on the water cut-off wall, making it possible to reduce the thickness and amount of reinforcement of the water cut-off wall.

[0011] A cover member may be provided that is supported by the load transmission member and closes the upper side of the drainage means near the upper end of the retaining wall. This prevents soil from falling from the embankment and clogging the drainage means. Furthermore, because it is supported by the load transmission member, the cover itself can be made of a simple structure such as a plate member.

[0012] A load-transmitting cover member may be provided, which is located between the retaining wall and the water cut-off wall and transmits the water pressure acting on the water cut-off wall to the retaining wall, and which closes the upper side of the drainage means near the upper end of the retaining wall. This allows for a reduction in the number of components compared to a structure that includes both the load-transmitting member and the cover member.

[0013] The water cut-off wall and the retaining wall may have a common underground portion, which allows for efficient construction of an embankment with a water cut-off structure around the site.

[0014] The upper part of the water cut-off wall, which is located at a height higher than the retaining wall, may be made of a transparent plate, thereby reducing the feeling of oppression felt by the upper part of the water cut-off wall, which is located at a height higher than the retaining wall. [Effects of the Invention]

[0015] According to the present invention, even if water surges around the retaining wall and seeps into the ground and into the embankment from below the retaining wall, the rise in the water level due to the inundation can be suppressed. [Brief explanation of the drawings]

[0016] [Figure 1] Figure (A) is an explanatory perspective view showing the site-surrounding water-stopping structure of the embodiment, and Figure (B) is an explanatory perspective view showing a building constructed on the site of this site-surrounding water-stopping structure. [Figure 2] Figure (A) is an explanatory diagram showing an outline of the site-perimeter waterproofing structure of the embodiment, and Figure (B) is an explanatory diagram showing the situation of water inundation from underground into the site-perimeter waterproofing structure. [Figure 3] Figure (A) is an oblique explanatory diagram showing an outline of a site-surrounding water-stopping structure having a load-transmitting member of an embodiment, and Figure (B) is an oblique explanatory diagram showing an outline of a site-surrounding water-stopping structure in which a cover member is placed on the load-transmitting member. [Figure 4] Figure (A) is an oblique explanatory diagram showing an outline of a site-surrounding water-stopping structure having a load-transmitting cover member of an embodiment, and Figure (B) is an oblique explanatory diagram showing the load-transmitting cover member set on a drainage ditch. [Figure 5] FIG. 10 is an explanatory diagram showing another embodiment of a site-perimeter waterproofing structure. [Figure 6] FIG. 10 is an explanatory diagram showing another embodiment of a site-perimeter waterproofing structure. [Figure 7] FIG. 10 is an explanatory diagram showing another embodiment of a site-perimeter waterproofing structure. [Figure 8] FIG. 10 is an explanatory diagram showing another embodiment of a site-perimeter waterproofing structure. [Figure 9] FIG. 10 is an explanatory diagram showing another embodiment of a site-perimeter waterproofing structure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment according to one aspect of the present invention will be described with reference to the accompanying drawings. 1(A) and 1(B) show a site having a site-perimeter waterproof structure 100 according to an embodiment, and a building 101 constructed on the site. The building 101 is built on an embankment 102 on the site. A water storage space 103 has been constructed underground on the site, and the space above this water storage space 103 is used as a garage. The water storage space 103 has, for example, a number of plastic structures with a column and beam structure within the space, which form gaps for storing water and are structured to withstand loads from above.

[0018] The site surrounding water-stopping structure 100 comprises a retaining wall 1 that receives the lateral pressure of the embankment 102, and a water-stopping fence 2 that is taller than the retaining wall 1 and is installed facing the retaining wall 1 at a distance from the retaining wall 1 on the outer periphery thereof.

[0019] The retaining wall 1 is constructed, for example, from a plurality of precast concrete retaining wall members 11 of a predetermined size. The plurality of retaining wall members 11 are arranged so that no gaps are formed between them. Each retaining wall member 11 has a drainage hole 11a at a predetermined height from its bottom surface.

[0020] The water cut-off wall 2 is made of, for example, a plurality of water cut-off wall members 21 made of precast concrete of a predetermined size. The plurality of water cut-off wall members 21 are arranged so that there are no gaps between them.

[0021] As shown in Figure 2(A), for example, a pile 12 protrudes from the bottom of each retaining wall member 11, and by embedding this pile 12 in the ground, each retaining wall member 11 can withstand the lateral pressure of the embankment and stand upright. Similarly, a pile 22 protrudes from the bottom of each water cut-off wall member 21, and by embedding this pile 22 in the ground, each water cut-off wall member 21 can withstand water pressure and stand upright.

[0022] The site-perimeter waterproof structure 100 also includes a drainage ditch 3 between the retaining wall 1 and the waterstop fence 2. The drainage ditch 3 is provided at a position lower than the height of the drainage holes 11a of the retaining wall 1, and is able to receive water from the drainage holes 11a. The drainage ditch 3 is made, for example, by arranging a plurality of U-shaped concrete ditch members.

[0023] The drainage groove 3 communicates with the water storage space 103 and is inclined so that a position close to the water storage space 103 is underwater. That is, in this embodiment, the drainage groove 3 and the water storage space 103 form a drainage means between the retaining wall 1 and the waterstop fence 2 that receives and drains water from the drainage holes 11a of the retaining wall 1.

[0024] Moreover, the site-perimeter waterproof structure 100 includes a load transmission member 4, and a cover member 5 is provided on the load transmission member 4.

[0025] With the site-perimeter waterproof structure 100, as shown in Figure 2(B), even if water seeps into the ground and seeps in from the underside of the water stop wall 2 and the retaining wall 1, causing the water to rise into the embankment 102, the water can be drained from the drainage holes 11a of the retaining wall 1 into the drainage ditch 3, and then flowed by the drainage ditch 3 into the water storage space 103. This makes it possible to prevent water from seeping into the embankment 102 from underground and rising above the height of the drainage holes 11a within the embankment 102.

[0026] Furthermore, even if the rate at which water seeps into the site from underground is high and the amount of water seeping into the site exceeds the amount of water discharged from the drainage holes 11a of the retaining wall 1, causing the water to rise to the surface of the embankment 102, this water will flow from the top of the retaining wall 1 into the drainage ditch 3, thereby preventing water from seeping under the floor of the building 101. This also means that the height of the embankment 102 does not need to be made too high.

[0027] The load transmission member 4 is located between the retaining wall 1 and the water cut-off fence 2, and transmits the water pressure acting on the water cut-off fence 2 to the retaining wall 1. As shown in FIG. 3(A), a plurality of protrusions 23 are attached horizontally at predetermined intervals to the facing surface of the water cut-off fence 2 that faces the upper side of the retaining wall 1. Protrusions 13 are also attached to the facing surface of the retaining wall 1 at the same height and at the same intervals as the protrusions 23. The protrusions 13, 23 are made of, for example, cylindrical members. Nuts are embedded in the facing surfaces of the retaining wall 1 and the water cut-off fence 2, and bolts are threaded into these nuts to secure the protrusions 13, 23.

[0028] The load transfer member 4 is made of, for example, a concrete block member, and has a recess 41 on its bottom surface into which the protrusions 13, 23 fit. When the protrusions 13, 23 fit into the recess 41, the top surface of the load transfer member 4 is approximately flush with the upper end of the retaining wall 1. The width of the load transfer member 4 is slightly shorter than the distance between the opposing surfaces of the retaining wall 1 and the water cut-off fence 2. When water pressure is applied to the water cut-off fence 2, the water cut-off fence 2 bends due to the load caused by this water pressure, and presses against one end face of the load transfer member 4 in the width direction. At this time, the other end face of the load transfer member 4 in the width direction presses against the opposing surface of the retaining wall 1, and the load transfer member 4 is in a state of tension between the retaining wall 1 and the water cut-off fence 2.

[0029] By providing the load transmission member 4, the load burden borne by the water stop wall 2 is reduced compared to a structure in which the water stop wall 2 alone bears the water pressure applied to the water stop wall 2, and it becomes possible to reduce the thickness and amount of reinforcement of the water stop wall 2.

[0030] The cover member 5 is supported by the load transmission members 4 and closes the upper side of the drainage ditch 3 near the upper end of the retaining wall 1. The cover member 5 is made of a metal or resin plate member without perforations, for example, as shown in FIG. 3(B). The width of the cover member 5 is approximately the same as the width of the load transmission members 4, and the length of the cover member 5 matches the arrangement pitch of the load transmission members 4. Note that, on the underside of the cover member 5, in a location between the load transmission members 4, 4, a rib portion extending in the same direction as the extension direction of the retaining wall 1 and a rib portion extending in a direction perpendicular to that direction may be provided.

[0031] A structure that includes the load transmission member 4 reduces the load burden on the water stop wall 2 compared to a structure in which the water stop wall 2 alone withstands the water pressure applied to the water stop wall 2, so the thickness and amount of reinforcement of the water stop wall 2 can be reduced.

[0032] Furthermore, a structure including the cover member 5 can prevent soil and the like from falling from the embankment 102 side and clogging the drainage ditch 3. Furthermore, since the cover member 5 is supported by the load transmission member 4, the cover member 5 can have a simple structure such as a plate member. Note that even if the cover member 5 has a structure with perforations, stones and the like that exceed the size of the perforations are prevented from falling into the drainage ditch 3, and therefore there is an effect of preventing clogging of the drainage ditch 3.

[0033] 4(A) and 4(B) may be used instead of the load transmission member 4 and the cover member 5. This load transmission cover member 6 combines the functions of the load transmission member 4 and the cover member 5. The load transmission cover member 6 includes, for example, a cover portion 61, a first hanging portion 62 located on the underside of the end of the cover portion 61 on the side facing the water stop wall 2, and a second hanging portion 63 located on the underside of the cover portion 61 on the side facing the retaining wall 1 at a position that does not overlap the upper end of the retaining wall 1.

[0034] Protrusion 23 is fixed to water stop wall 2, and recess 62a formed in first hanging portion 62 engages with protrusion 23 from above. The portion of lid portion 61 on the retaining wall 1 side is located above the upper end of retaining wall 1 and rests on said upper end. The distance between the outer surfaces of first hanging portion 62 and second hanging portion 63 is slightly shorter than the opposing width dimension (horizontal width of drainage ditch 3) of retaining wall 1 and water stop wall 2. Furthermore, a plurality of reinforcing members 64 connecting the inner surfaces of first hanging portion 62 and second hanging portion 63 are arranged in the extension direction of retaining wall 1 and water stop wall 2. First hanging portion 62, second hanging portion 63, and reinforcing member 64 form a load transmission section.

[0035] The site-perimeter waterproof structure including the load-transmitting cover member 6 can reduce the number of components compared to a structure including both the load-transmitting member 4 and the cover member 5.

[0036] Next, other examples of the substructure of the retaining wall 1 and the water cut-off fence 2 are shown below. In the structure shown in Figure 5, the retaining wall 1 and the water cut-off fence 2 are connected to each other below the drainage ditch 3 and integrated, with a common pile 200 on the underside of this connection. In other words, in this site-perimeter water cut-off structure, the retaining wall 1 and the water cut-off fence 2 share a common underground portion.

[0037] In the site-perimeter waterproof structure shown in FIG. 6, the retaining wall 1 does not have piles 12 at its lower part, but has a horizontal plate portion 14, so that the vertical cross section is substantially L-shaped.

[0038] The site-perimeter waterproof structure shown in Figure 7 has an integrated structure in which the retaining wall 1 and the water cut-off fence 2 share a common horizontal plate portion 201. In other words, this site-perimeter waterproof structure is a structure in which the retaining wall 1 and the water cut-off fence 2 share a common underground portion.

[0039] The water-stop structure around the site shown in Figure 8 has a structure in which the retaining wall 1 has a horizontal plate portion 14, the water-stop fence 2 has a horizontal plate portion 24, and the horizontal plate portion 14 is placed on the horizontal plate portion 24.

[0040] As shown in Figs. 5 and 7, if the water cut-off wall 2 and the retaining wall 1 are an integrated structure, it is possible to efficiently construct an embankment with a water cut-off structure around the site.

[0041] 9, the upper part of the water fence 2, which is higher than the retaining wall 1, may be made of a transparent plate 25 made of acrylic resin or the like. For example, the water fence 2 may have support posts bolted to the top end of the water fence 2 at predetermined intervals, with the transparent plate 25 fitted between the support posts. This reduces the feeling of oppression from the upper part of the water fence 2, which is higher than the retaining wall 1.

[0042] In the above embodiment, the drainage means is configured to store water that has flowed into the drainage ditch 3 in the water storage space 103, but this does not necessarily mean that the water storage space 103 needs to be kept empty at all times. For example, water may normally be stored in the water storage space 103, and when a weather forecast predicts river flooding due to heavy rain, the water may be drained from the water storage space 103 to empty it. The drainage means may also be configured to drain the water that has flowed into the drainage ditch 3 into a sewer ditch using a pump, rather than into the water storage space 103. Alternatively, the drainage means may be configured to pump up the water that has flowed into the drainage ditch 3 and drain it outside the water cut-off wall 2.

[0043] In the above embodiment, the site-perimeter waterproof structure was applied to the site of an individual building, but this is not limited to this. For example, in a large site where buildings are built in multiple sections on a single embankment, a structure can be configured that includes a retaining wall that withstands the lateral pressure of the embankment, a water cut-off fence that faces the retaining wall on the outer periphery, and drainage means that receives and drains water from the drainage holes in the retaining wall between the retaining walls. In such a structure, the water storage space 103 can be large and shared by multiple buildings, and the upper part can be used as a park or the like.

[0044] Furthermore, if there is land surrounding the existing retaining wall 1, it is possible to install a waterproof fence 2 and a drainage ditch 3 on this land area later.

[0045] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0046] 1: Retaining wall 2: Water-stopping wall 3: Drainage channel (drainage means) 4: Load transmission member 5: Lid member 6: Load transmission cover member 11: Retaining wall member 11a: Drain hole 12:Pile 13:Protrusion 14:Horizontal plate part 21: Water-stopping wall components 22:Pile 23:Protrusion 24:Horizontal plate part 25: Transparent plate 41: Recess 61: Lid 62: 1st hanging part 62a: recess 63:Second hanging part 64: Reinforcement member 100:Waterproof structure around the site 101: Building 102: Embankment 103: Water storage space (drainage means) 200: Common pile 201:Horizontal plate part

Claims

1. A water-stop structure around a site comprising: a retaining wall that withstands the lateral pressure of the embankment; a water-stop fence that is higher than the retaining wall and is installed facing the retaining wall at a distance from the retaining wall on the outer periphery of the retaining wall; and drainage means that receives and drains water from the drainage holes in the retaining wall between the retaining wall and the water-stop fence.

2. 2. The site-perimeter water-stop structure according to claim 1, further comprising a load-transmitting member positioned between the retaining wall and the water-stop fence to transmit the water pressure acting on the water-stop fence to the retaining wall.

3. 3. The site-perimeter water-stop structure according to claim 2, further comprising a cover member supported by the load-transmitting member and closing the upper side of the drainage means near the upper end of the retaining wall.

4. A site-perimeter water-stop structure as described in claim 1, characterized in that it is provided with a load-transmitting cover member located between the retaining wall and the water-stop fence, which transmits the water pressure acting on the water-stop fence to the retaining wall, and which blocks the upper side of the drainage means near the upper end of the retaining wall.

5. 5. The site-perimeter water stop structure according to claim 1, wherein the water stop wall and the retaining wall have a common underground portion.

6. A site-perimeter water-stop structure according to any one of claims 1 to 5, characterized in that the upper portion of the water-stop wall, which is located at a height higher than the retaining wall, is made of a transparent plate.

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