Drainage device

Abstract

To provide a draining device capable of effectively preventing water from entering the interior of a concrete building.SOLUTION: As a constitution of a draining device 1, by employing two-stage slopes 11b and 11c inclined downward toward a water-flowing side formed on one side of the mounting surface 11b of a draining member 11, a sealing agent 6 applied to the upper surface of the draining member 11 when installed in an existing concrete building 2 is sufficiently held between the slopes 11b and 11c of the draining member 11 and the downward face of the concrete structure 2 to effectively prevent water flowing through the downward face of the concrete structure 2 from entering the interior of the concrete structure 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drainage device for blocking the flow of water passing through the side surface or the downward surface of a concrete structure.

Background Art

[0002] In concrete structures such as bridges, when rainwater flows from the side surface to the downward surface during rainy weather, dirt may adhere to the concrete surface, impairing the aesthetic appearance. In addition, in the case of a concrete structure installed in a cold region, the water adhering to the concrete surface may repeatedly freeze and thaw, causing the surface layer to deteriorate and peel off. Further, in a bridge where a concrete floor slab is supported by a steel bridge pier, the bridge pier may be corroded by rainwater flowing from the floor slab to the bridge pier.

[0003] For this reason, a drainage device for blocking the flow of water passing through the downward surface of the above-described concrete structure may be installed (see, for example, Patent Document 1).

[0004] The drainage device disclosed in Patent Document 1 embeds a female screw member in the downward surface of the concrete floor slab portion of a bridge, and screws a mounting bolt that penetrates the drainage member into the female screw member, thereby attaching the drainage member to the downward surface of the floor slab portion. The drainage member is a long member having a uniform cross-sectional shape in the width direction, and the cross-sectional shape has a vertical portion orthogonal to the downward surface of the floor slab portion continuously provided at one end of a flat upper surface (mounting surface) facing the downward surface of the floor slab portion. Thereby, the water flowing from the side surface of the floor slab portion to the downward surface is blocked by the drainage member, and drips down through the vertical portion of the drainage member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] However, in a water drainage device using a water drainage member with an L-shaped cross-section, such as the one described in Patent Document 1, there is a risk that some of the water flowing down the downward surface of the concrete structure may seep into the interior of the concrete structure through the gap between the downward surface of the concrete structure and the mounting surface of the water drainage member.

[0007] One possible solution to this is to interpose a sealant between the downward-facing surface of the concrete structure and the mounting surface of the flashing member when attaching the flashing member to the concrete structure. However, even in this case, there is a concern that tightening the flashing member with mounting bolts will push the sealant out from between the flashing member and the concrete structure, making it impossible to adequately prevent water from entering.

[0008] Therefore, the object of the present invention is to provide a water drainage device that can effectively prevent water from entering the interior of a concrete structure. [Means for solving the problem]

[0009] To solve the above problems, the present invention provides a water drainage device provided on the surface of a downward-facing surface of a concrete structure to block the flow of water along the downward-facing surface of the concrete structure, comprising a water drainage member attached to the downward-facing surface of the concrete structure, wherein the water drainage member is a long member with a uniform cross-sectional shape in the width direction, and the cross-sectional shape is configured such that a slope is formed on one side of the mounting surface facing the downward-facing surface of the concrete structure, sloping downward toward the side from which water flows along the downward-facing surface of the concrete structure.

[0010] With the above configuration, when installing the drainage device on an existing concrete structure, by installing the drainage member with a sealant interposed between its mounting surface and the downward-facing surface of the concrete structure, a portion of the sealant extruded from between the two surfaces is held between the downward-facing surface of the concrete structure and the slope of the drainage member, making it difficult for water flowing down the downward-facing surface of the concrete structure to penetrate between the downward-facing surface of the concrete structure and the mounting surface of the drainage member.

[0011] Furthermore, when installing a water drainage device at the same time as constructing a new concrete structure, by pouring the concrete for the structure so that the mounting surface and slope of the water drainage member are in contact with the downward-facing surface of the concrete structure, the direction of water intrusion at the interface between the downward-facing surface of the concrete structure and the slope of the water drainage member will be diagonally upward, making it less likely for water to penetrate along that interface.

[0012] If the drainage member is configured to have multiple slopes, the water intrusion prevention effect described above can be further enhanced.

[0013] Furthermore, it is desirable that the drainage member be an extruded molded body made of resin material. In this way, the mold used in the extrusion molding process can be shaped to be capable of molding a drainage member having an embedded portion to be embedded in a newly constructed concrete structure, and the same mold can also be used to mold a drainage member without an embedded portion to be attached to the downward-facing surface of an existing concrete structure, thereby reducing manufacturing costs when differentiating drainage devices according to installation conditions. Note that the resin material includes not only pure resin but also FRP. [Effects of the Invention]

[0014] As described above, the drainage device of the present invention has a slope that inclines downward toward the direction from which water flows on one side of the mounting surface of the drainage member to the concrete structure. Therefore, regardless of whether the concrete structure to which it is installed is existing or newly constructed, it can effectively prevent water from entering the interior of the concrete structure. [Brief explanation of the drawing]

[0015] [Figure 1] Front cross-sectional view showing the installation state of the drainage device of the first embodiment. [Figure 2] Perspective view of the main part of the drainage member shown in Figure 1. [Figure 3] Front cross-sectional view showing the installation state of the drainage device of the second embodiment. [Figure 4] Front cross-sectional view showing the installation state of the drainage device of the third embodiment.

[0016] Embodiments of the present invention will be described below with reference to the drawings. Figures 1 and 2 show a water drainage device 1 of the first embodiment. This water drainage device 1 is installed on the surface of the downward-facing surface of an existing concrete structure 2 to block the flow of water along that downward-facing surface, and comprises a water drainage member 11 made of FRP attached to the downward-facing surface, a stainless steel female threaded anchor 12 embedded in the concrete structure 2, and an FRP mounting bolt 13 that penetrates the water drainage member 11 and is screwed into the female threaded anchor 12. The concrete structure 2 on which the water drainage device 1 is installed has reinforcing bars 4 arranged vertically and horizontally in a plan view, and spacers 5 embedded in the main concrete 3 so that the reinforcing bars 4 are not exposed on the surface of the concrete structure 2.

[0017] The water drainage member 11 is a long member that extends along the side and downward corner of the concrete structure 2 (or approximately parallel to its extension direction if the concrete structure 2 is a bridge), and its cross-sectional shape in the width direction is uniformly formed by pultrusion molding.

[0018] In the cross-sectional shape of the drainage member 11 in the width direction, on one side of the mounting surface 11a facing the downward surface of the concrete structure 2, two inclined surfaces 11b and 11c that incline downward toward the side where water flows along the downward surface of the concrete structure 2 (the side closer to the corner of the concrete structure 2) are formed in a state sandwiching the flat surface 11d, and at the lower end of the outer inclined surface 11c, a vertical portion 11e perpendicular to the downward surface of the concrete structure 2 is continuous.

[0019] Also, in the part with the mounting surface 11a of the drainage member 11 as the upper surface, a plurality of long holes 11f extending in the extending direction of the drainage member 11 and passing through the shaft portions of the mounting bolts 13 are formed at equal intervals. Here, the reason for passing the shaft portions of the mounting bolts 13 through the long holes 11f is to enable the attachment of the drainage member 11 even if the female screw anchor 12 is buried with a slight shift from a predetermined position so as not to interfere with the reinforcing bar 4 disposed in a direction intersecting the extending direction of the drainage member 11.

[0020] The female screw anchor 12 and the mounting bolt 13 are commercially available. In a state where the female screw anchor 12 is driven into the mounting hole 2a formed in the downward surface of the concrete structure 2 and fixed to the concrete 3, the shaft portion of the mounting bolt 13 passed through the long hole 11f of the drainage member 11 is screwed into the female screw anchor 12 together with an adhesive, whereby the drainage member 11 is attached to the downward surface of the concrete structure 2.

[0021] Here, when attaching the drainage member 11 as described above, the sealing agent 6 is sufficiently applied to the mounting surface 11a, the first-stage inclined surface 11b, and the flat surface 11d of the drainage member 11 in advance. Thereby, when the drainage member 11 is tightened with the mounting bolt 13, even if a part of the sealing agent 6 is extruded from its application position, the extruded sealing agent 6 can be held between the second-stage inclined surface 11c of the drainage member 11 and the downward surface of the concrete structure 2, so that the sealing agent 6 can play a role in preventing water intrusion.

[0022] That is, the water flowing downward from the side surface of the concrete structure 2 is blocked in its flow by the drainage member 11 and the sealing agent 6, drips down through the vertical part 11e of the drainage member 11, and it is difficult for the water to penetrate between the downward surface of the concrete structure 2 and the mounting surface 11a of the drainage member 11.

[0023] This drainage device 1 has the above configuration, and since two-step inclined surfaces 11b and 11c that slope downward toward the side from which the water flows are formed on one side of the mounting surface 11a of the drainage member 11, the sealing agent 6 can be sufficiently held between the drainage member 11 and the concrete structure 2, and water intrusion into the interior of the concrete structure 2 can be effectively prevented.

[0024] FIG. 3 shows a state in which the drainage device 7 of the second embodiment is installed on the surface portion of the downward surface of the concrete structure 2 that is slightly inclined. In this second embodiment, only the shape of the drainage member 21 is different from that of the first embodiment, and the configuration of the female screw anchor 22 and the mounting bolt 23 for attaching the drainage member 21 to the downward surface of the concrete structure 2 is the same as that of the first embodiment.

[0025] In the cross-sectional shape in the width direction of the drainage member 21 of the second embodiment, only one inclined surface 21b that slopes downward toward the side from which the water flowing along the downward surface of the concrete structure 2 comes is formed on one side of the mounting surface 21a, and a vertical part 21c orthogonal to the downward surface of the concrete structure 2 is continuous at the lower end of the inclined surface 21b. Also, a vertical part 21d is continuous at the other end of the mounting surface 21a, and a plurality of long holes 21e that extend in the extending direction of the drainage member 21 and pass through the shaft part of the mounting bolt 23 are formed at equal intervals in a part having the mounting surface 21a as the upper surface.

[0026] Therefore, also in the drainage device 7 of this second embodiment, similar to the first embodiment, by applying a sufficient amount of the sealing agent 6 to the mounting surface 21a when attaching the drainage member 21, the sealing agent 6 extruded therefrom is held between the inclined surface 21b of the drainage member 21 and the downward surface of the concrete structure 2, and water intrusion into the interior of the concrete structure 2 can be prevented.

[0027] In the first and second embodiments described above, the drainage devices 1 and 7 are installed in an existing concrete structure 2. However, the present invention can also be applied to drainage devices installed in newly constructed concrete structures, as shown in the third embodiment in Figure 4.

[0028] The third embodiment of the drainage device 8 lacks the female threaded anchors and mounting bolts of the first and second embodiments. Instead, the drainage member 31 is provided with an embedded portion 32 extending upward from its mounting surface 31a, a hook 33 that engages with the embedded portion 32, and a pin 34 that is press-fitted between the two to ensure their engagement. The drainage device is installed by embedding the embedded portion 32, hook 33, and pin 34 of the drainage member 31 into the concrete structure 2, and then pouring concrete 3 so that the downward-facing surface of the concrete structure 2 is formed along the mounting surface 31a of the drainage member 31, the two slopes 31b and 31c, and the flat surface 31d between the two slopes 31b and 31c. Here, the drainage member 31 is made of FRP that has sufficient rigidity and corrosion resistance to withstand concrete pouring. The pin 34 is made of PP (polypropylene) or the like.

[0029] In this drainage device 8, the inclined surfaces 31b and 31c of the drainage member 31 play a role in making it difficult for water to penetrate between the mounting surface 31a and the downward surface of the concrete structure 2 due to their inclination.

[0030] Furthermore, by making the drainage member 31 an extruded molded body, it becomes possible to mold a drainage member without an embedded portion that can be attached to the downward-facing surface of an existing concrete structure using the same extruded mold. This reduces the manufacturing cost when differentiating the drainage device according to the installation conditions (whether the concrete structure to be installed is new or existing).

[0031] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims, not in the sense described above, and all modifications within the sense and scope equivalent to the claims are intended.

[0032] For example, when installing a drainage device on an existing concrete structure, the means of fixing the drainage member to the downward-facing surface of the concrete structure are not limited to the method using female threaded anchors and mounting bolts as in the embodiment; a method of bonding with adhesive can also be employed. [Explanation of Symbols]

[0033] 1, 7, 8 Drainage device 2. Concrete structures 3. Concrete 4 Reinforcement bars 6. Sealant 11, 21, 31 Drainage components 11a, 21a, 31a Mounting surface 11b, 11c, 21b, 31b, 31c slopes 12, 22 Female threaded anchors 13, 23 Mounting bolts 32 Buried section 33 hooks 34 pins

Claims

1. A drainage device provided on the surface of the downward-facing surface of a concrete structure, which blocks the flow of water along the downward-facing surface of the concrete structure, The concrete structure is equipped with a drainage member that is attached to the downward surface, The drainage member is a long member with a uniform cross-sectional shape in the width direction, and its cross-sectional shape is such that on one side of the mounting surface facing the downward surface of the concrete structure, there is a slope that inclines downward toward the side from which water flows along the downward surface of the concrete structure, adjacent to the mounting surface. The drainage member has multiple slopes formed therein. A drainage device characterized in that two slopes are formed in such a way that they sandwich a flat surface, with the slopes sloping downward toward the corner from which water flows down the downward surface of the concrete structure.

2. The drainage device according to claim 1, characterized in that the drainage member is an extruded molded body made of a resin material.

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