Water passage form and attachment method of the same

Abstract

To provide a water passage form eliminating consideration on an overlapped size for a holding member even the water passage form is held at a specific position in an installation area with the holding member upon concrete installation where a through water passage penetrating through the concrete body is formed using the water passage form arranged in the concrete body.SOLUTION: An attachment method of a water passage form comprises preparing a water passage form 20 forming a through space 20a to become a through water passage inside therein and a holding member 31 to hold the water passage form 20. The water passage form 20 is placed in an installation area such that the through space 20a penetrates the installation area of concrete as well as the holding member 31 is placed over the outside of the installation area and the through space 20a. In this situation, a part of the water passage form 20 is clamped and held between a second part 31b of the holding member 31 positioned within the through space 20a and a structure 30 partitioning the installation area by connecting a first part 31a of the holding member 31 to a specific area 32 outside thereof.SELECTED DRAWING: Figure 7A

Description

[Technical Field]

[0001] The present invention relates to a water channel forming body for forming a through-hole water channel in a concrete skeleton, and also to a method for installing the water channel forming body. [Background technology]

[0002] Conventionally, concrete structures having through-holes are sometimes constructed. One such concrete structure is a concrete wall (e.g., a foundation beam) that separates a rainwater storage tank. In this case, the through-hole penetrates the lower end of the concrete wall at the bottom of the rainwater storage tank, for example. Patent Document 1 below is a prior art related to the present application.

[0003] FIG. 1 shows an example of the above-mentioned concrete wall 1. In FIG. 1, the through-channel 2a is formed by a channel forming body 2 provided so as to penetrate the concrete wall 1. The channel forming body 2 has, for example, a U-shaped cross section that opens downward. The channel forming body 2 is formed, for example, from GRC (Glass Fiber Reinforced Cement).

[0004] Such a waterway formation body 2 is placed on the concrete bottom surface 3, which is the bottom surface of the pouring area, before concrete is poured. At this time, the waterway formation body 2 is held in a fixed position by a retaining member 4. In Figure 1, the retaining member 4 is a steel band, and multiple steel bands 4 are used.

[0005] Each steel band 4 has a first end 4a located at one widthwise end of the water channel forming body 2, a second end (not shown) located at the other widthwise end of the water channel forming body 2, and an intermediate portion 4b extending along the outer peripheral surface of the water channel forming body 2 from the first end 4a to the second end.

[0006] The first end 4a and the second end 4b are fixed to the concrete bottom surface 3 with concrete nails 5, thereby fixing the water channel forming body 2 to the concrete bottom surface 3. Formwork is then installed around the pouring area, and concrete is poured into the pouring area. As a result, as shown in Figure 1, the water channel forming body 2 is incorporated into the lower end of the concrete wall 1, and a through-hole water channel 2a is defined and formed through the concrete wall 1. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Utility Model Application Publication No. 61-40446 Summary of the Invention [Problem to be solved by the invention]

[0008] FIG. 2 is a view of the waterway forming body 2 fixed to the concrete bottom surface 3, viewed in its width direction (the width direction of the through-flow waterway), showing the state before concrete is poured. In FIG. 2, the two-dot chain line indicates the outer surface of the pouring area (the surface of the concrete wall 1 after pouring). Although not shown in FIG. 1, reinforcing bars 6, such as stirrups 6a, 6c and web bars 6b, are arranged in the pouring area. In FIG. 2, the reference numeral 9 indicates main reinforcement.

[0009] It is necessary to ensure a specified cover dimension for the reinforcing bars 6, that is, the reinforcing bars 6 must be positioned so that the cover dimension at the shortest distance from the surface of the concrete wall 1 to the surface of the reinforcing bars 6 is equal to or greater than a specified value.

[0010] If the steel bands 4 as retaining members are considered to be equivalent to the reinforcing bars 6, then if the steel bands 4 are placed near the surface of the concrete wall 1 as shown in Figures 1 and 2, it will be impossible to ensure the specified cover dimension for the steel bands 4. Alternatively, the builder may focus only on the waterway formation 2 and overlook the need to ensure the specified cover dimension for the steel bands 4.

[0011] On the other hand, if the steel band 4 (retaining member) is placed inside the reinforcing bar 6 in the concrete wall 1 (inside in the left-right direction in Figure 2) to ensure a specified cover dimension for the steel band 4, the reinforcing bar 6 will interfere with the work of driving the concrete nails 5, reducing workability.

[0012] Therefore, the object of the present invention is to provide a new technology that, when a through-hole water channel that penetrates a concrete body is formed using a water channel forming body installed in the concrete body, does not require consideration of the cover dimension of the retaining member even when the water channel forming body is held in a predetermined position in the pouring area by the retaining member when pouring concrete. [Means for solving the problem]

[0013] In order to achieve the above object, a method for installing a water channel forming body according to the present invention is a method for installing a water channel forming body that is installed in a concrete skeleton and forms a through-channel, comprising the steps of: (A) preparing the water channel forming body that forms a through space that becomes the through water channel inside, and a holding member for holding the water channel forming body; (B) The water channel forming body is placed in the concrete pouring area so that the through space passes through the pouring area, and the retaining member is placed so that it spans both outside the pouring area and within the through space. By connecting a first part of the retaining member to a predetermined location outside the pouring area, a part of the water channel forming body is sandwiched and held between a second part of the retaining member located within the through space and a structure that defines the pouring area.

[0014] The waterway forming body according to the present invention is a waterway forming body that is provided in a concrete skeleton to form a through waterway, and is held by a predetermined holding member when pouring concrete to form the concrete skeleton, A through space is formed on the inside to become a through waterway that penetrates the concrete skeleton after the concrete is poured, The through-space is arranged so as to penetrate the concrete pouring area during concrete pouring, The retaining member is connected to a predetermined location outside the casting area and extends into the through space, and has a retained portion that is sandwiched and held between the retaining member and a structure that defines the casting area. [Effects of the Invention]

[0015] According to the present invention, when a through-flow water channel that penetrates a concrete body is formed using a water channel forming body installed in the concrete body, even if the water channel forming body is held in a predetermined position in the pouring area by a retaining member when pouring concrete, there is no need to consider the cover dimension for the retaining member. [Brief explanation of the drawings]

[0016] [Figure 1] 1 shows an example of a concrete wall according to the prior art. [Figure 2] FIG. 2 is an explanatory diagram of pouring concrete to form the concrete wall of FIG. 1. [Figure 3] 1 is a perspective view showing an example of the configuration of a concrete skeleton to which a water channel formation according to an embodiment of the present invention is applied. [Figure 4] FIG. 1 is a cross-sectional view showing a rainwater storage facility. [Figure 5A] FIG. 2 is a front view of the water channel formation according to the embodiment. [Figure 5B] FIG. 5B is a diagram showing an imaginary circle of a predetermined diameter in FIG. 5A. [Figure 6] 1 is a flowchart illustrating a method for installing a water channel former according to an embodiment of the present invention. [Figure 7A] 10A to 10C are explanatory diagrams of a method for attaching a water channel formation according to an embodiment. [Figure 7B] FIG. 7B is a cross-sectional view taken along line 7B-7B in FIG. 7A. [Figure 7C] 7C is a cross-sectional view taken along line 7C-7C in FIG. 7B. [Figure 8] FIG. 10 is a cross-sectional view of a water channel formation according to a modified example of the present invention. [Figure 9A] FIG. 10 is a cross-sectional view of a water channel former according to another modified example of the present invention. [Figure 9B] 9B is a diagram in which the holding member is omitted from FIG. 9A. [Figures 10A-10C] FIG. 10 is a cross-sectional view of a water channel former according to yet another modified example of the present invention. [Figure 11A] 1 is a plan view of a portion of an apartment building having a concrete wall to which the water channel formation of the present invention can be applied. [Figure 11B] FIG. 11B is a cross-sectional view taken along line 11B-11B in FIG. 11A. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described with reference to the drawings. In addition, common parts in the drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0018] (Configuration of waterway formation body) 3 is a perspective view showing an example of the configuration of a concrete skeleton 10 to which a water channel forming body 20 according to an embodiment of the present invention is applied. The water channel forming body 20 is provided in the concrete skeleton 10 to form a through-hole water channel 20a. In other words, the water channel forming body 20 forms a through space inside that becomes the through-hole water channel 20a that penetrates the concrete skeleton 10.

[0019] FIG. 4 is a cross-sectional view of a rainwater storage facility 7 having a concrete wall (e.g., a foundation beam), which is an example of a concrete skeleton 10. The concrete wall 10 is formed so as to separate adjacent rainwater storage tanks 8 in the water storage facility 7. The rainwater storage facility 7 is installed, for example, underground on the grounds of an apartment building. The rainwater storage facility 7 temporarily stores rainwater in the rainwater storage tanks 8 and discharges the stored rainwater to an external location, such as a river, at an allowable flow rate. A through-flow water channel 20a that penetrates the concrete wall 10 is formed at the lower end of the concrete wall 10.

[0020] When pouring concrete to form the concrete skeleton 10, the waterway forming body 20 is positioned so that the through space 20a passes through the area where the concrete is poured. After pouring the concrete, the waterway forming body 20 is positioned so that it penetrates the concrete skeleton 10, and forms a through space 20a on the inside that becomes the through waterway 20a that penetrates the concrete skeleton 10 as shown in Figure 3.

[0021] Hereinafter, the direction in which the through-flow water passage 20a penetrates the water passage forming body 20 will be referred to simply as the penetration direction (or the penetration direction of the through-flow water passage 20a or the through-flow space 20a), and the horizontal direction perpendicular to the penetration direction will be referred to simply as the width direction (or the width direction of the through-flow water passage 20a or the through-flow space 20a).

[0022] The main body 20A of the water channel forming body 20 may be made of concrete. The main body 20A of the water channel forming body 20 may be the entire water channel forming body 20 except for its lower end (sealing member 24 described below). The concrete forming the main body 20A may be reinforced with fiber. In this case, the fiber may be, for example, vinylon, polypropylene, carbon, stainless steel, steel, etc. The main body 20A of the water channel forming body 20 may also be made of other materials (for example, resin).

[0023] 5A is a front view of the water channel forming body 20 as seen from the penetration direction of the through-channel 20a. In this embodiment, the through space 20a in the water channel forming body 20 has a downward opening 20a1. In this case, the cross section of the water channel forming body 20 taken along a plane perpendicular to the penetration direction of the through-channel 20a may be U-shaped with an opening at the bottom. The opening 20a1 is closed by a structure 30 (FIG. 3) that forms the bottom surface of the area where concrete is poured to form the concrete skeleton 10. This bottom surface is the top surface 30a of the structure 30.

[0024] In this embodiment, the cross-sectional shape and dimensions of the water channel forming body 20 in a plane perpendicular to the penetration direction may be constant (the same shape and dimensions as in Figure 5A) over the entire range of the water channel forming body 20 in the penetration direction of the through water channel 20a.

[0025] The waterway forming body 20 is configured to be held by a predetermined holding member 31, which will be described later, when pouring concrete. That is, the waterway forming body 20 has a held portion 20b that is held by the holding member 31. The held portion 20b is sandwiched and held between the holding member 31, which is connected to a predetermined location outside the pouring area and extends into the through space 20a, and the structure 30 that defines the pouring area.

[0026] The water channel forming body 20 has an upper inner surface 21a located above the through space 20a, and first and second inner surfaces 22a, 23a located on both sides of the through space 20a in the width direction. The through space 20a is defined by the upper inner surface 21a and the first and second inner surfaces 22a, 23a.

[0027] Each of the first and second inner surfaces 22a, 23a has an intermediate surface portion 22a1, 23a1 located midway in the height direction and a lower surface portion 22a2, 23a2 located below the intermediate surface portion 22a1, 23a1. The lower surface portions 22a2, 23a2 are shifted inward in the width direction relative to the intermediate surface portions 22a1, 23a1. The portions of the water channel forming body 20 that form the lower surface portions 22a2, 23a2 are the above-mentioned held portions 20b.

[0028] Such a water channel forming body 20 may have an upper wall 21 and first and second side walls 22, 23. The upper wall 21 forms an upper inner surface 21a. The first side wall 22 extends downward from one end of the upper wall 21 in the width direction and forms a first inner surface 22a. The second side wall 23 extends downward from the other end of the upper wall 21 in the width direction and forms a second inner surface 23a. Each of the first side wall 22 and the second side wall 23 has a portion of the lower surface portion 22a2, 23a2 that protrudes inward in the width direction beyond the intermediate surface portion 22a1, 23a1 as a held portion 20b.

[0029] FIG. 5B shows an imaginary circle Ci of a predetermined diameter (e.g., 150 mm) in FIG. 5A. In one embodiment, the channel formation 20 fits inside the imaginary circle Ci when viewed from the penetration direction. This is to prevent the channel formation 20 installed in the concrete skeleton 10 from being considered a foreign object that could affect the concrete strength. In other words, if the entire channel formation 20 does not fit within the imaginary circle Ci of a predetermined diameter (e.g., 150 mm), the portion of the channel formation 20 extending beyond the imaginary circle Ci may be considered a foreign object in the concrete, and it may be necessary to confirm that the concrete strength is not affected. For example, in the case of FIG. 2, where a steel band 4 is used, if the steel band 4 extends beyond the imaginary circle Ci as part of the channel formation, the concrete strength of the portion extending beyond the imaginary circle Ci must be confirmed.

[0030] In this embodiment, the steel band 4 of FIG. 2 is not used, so there is no need to fit both the water channel formation body 20 and the steel band 4 inside the imaginary circle Ci.

[0031] Furthermore, when the water channel forming body 20 is to be fitted within the imaginary circle Ci, the outer surface 27a of the connection portion 27 (the portion surrounded by the dashed line in Fig. 5A) between the upper side wall 21 of the water channel forming body 20 and each side wall 22, 23 may have a chamfered shape as shown in Fig. 5A when viewed from the penetration direction. This allows the water channel forming body 20 to be fitted inside the imaginary circle Ci of the above-mentioned predetermined diameter (for example, 150 mm) as shown in Fig. 5B, while at the same time making it possible to make the cross-sectional area of the penetration space 20a as large as possible.

[0032] The lower end of the water channel forming body 20 is formed by a sealing member 24 that seals the gap between the lower end and the bottom surface 30a formed by the structure 30. That is, the sealing member 24 is joined to the lower end surface 20c of the main body 20A of the water channel forming body 20 by appropriate means (for example, adhesive). In this embodiment, the lower end surface 20c of the main body 20A is made up of the lower end surface of the first side wall 22 and the lower end surface of the second side wall 23.

[0033] The sealing member 24 may be formed in a sheet shape having a thin thickness in the vertical direction, as shown in Fig. 3 or 5A. The material forming the sealing member 24 may be, for example, foam rubber, but is not limited to this.

[0034] (Installation method of waterway formation body) 6 is a flowchart showing a method for attaching the water channel forming body 20 according to an embodiment of the present invention. This method is a method for attaching the above-mentioned water channel forming body 20 to an area where concrete is poured to form the concrete skeleton 10. This method includes steps S1 to S4.

[0035] In step S1, a water channel forming body 20 that forms a through space 20a inside and a holding member 31 for holding the water channel forming body 20 are prepared. This holding member 31 is a thin plate-like member, as shown in Figures 7A and 7B described below. The plate-like member 31 may be a steel plate made of steel. This steel plate 31 may have a rectangular shape when viewed in the thickness direction. In this embodiment, two holding members 31 (steel plates) are prepared for one water channel forming body 20.

[0036] In this embodiment, in step S1, a formwork, a formwork base 32, etc. are further prepared. In this embodiment, the base 32 is a batten (batten).

[0037] In step S2, the components prepared in step S1 are placed in the casting area. Fig. 7A is a perspective view showing an example of the state immediately after step S2 is performed. Fig. 7B is a cross-sectional view taken along line 7B-7B in Fig. 7A. Fig. 7C is a cross-sectional view taken along line 7C-7C in Fig. 7B. In Fig. 7C, the two-dot chain line indicates the outer surface of the casting area. Although not shown in Fig. 7A, reinforcing bars 6 such as stirrups 6a, 6c and web bars 6b are placed in the casting area. Note that main reinforcement bars 9 may be placed inside the concrete structure 30, as shown in Fig. 7C.

[0038] In step S2, the waterway forming body 20 is placed in the concrete pouring area so that the through space 20a passes through the pouring area, and the retaining member 31 is placed so that it extends between the outside of the pouring area and the inside of the through space 20a, and the first part 31a of the retaining member 31 is joined to a predetermined location outside the pouring area. As a result, the held part 20b of the waterway forming body 20 is sandwiched and held between the second part 31b of the retaining member 31 and the structure 30 that defines the pouring area.

[0039] Here, the direction in which the held portion 20b is sandwiched between the second portion 31b of the holding member 31 and the structure 30 that defines the pouring area may be the vertical direction as shown in Figures 7A and 7B, but is not limited to this direction according to the present invention. In this case, the through space 20a may be open to the structure 30 side. Also, the predetermined location to which the first portion 31a of the holding member 31 is joined may be the base 32 of the formwork as shown in Figures 7A and 7B, but is not limited to the base 32 according to the present invention. Step S2 includes, for example, steps S21 to S25.

[0040] In step S21, formwork bases 32 (shields) are arranged around the pouring area so as to define the lower end of the pouring area.

[0041] In step S22, the water channel forming body 20 is placed in the casting area so that the through space 20a passes through the casting area.

[0042] In step S23, the retaining member 31 is arranged so as to extend from outside the pouring area to inside the through space 20a. In this embodiment, as shown in Figures 7A and 7B, for example, at each of one end side and the other end side of the water channel formation body 20 in the penetration direction of the through space 20a, the retaining member 31 (steel plate) is placed on the upper surface of the base 32 and the upper end surface 20b1 of the retained portion 20b (protruding portion) in the through space 20a.

[0043] In step S24, the first part 31a of the retaining member 31 is coupled to the base 32 (shield), which is the predetermined location outside the pouring area, thereby sandwiching and holding the held part 20b of the water channel forming body 20 between the second part 31b of the retaining member 31 and the structure 30 that defines the pouring area. In this state, the second part 31b of the retaining member 31 may press the held part 20b of the water channel forming body 20 against the structure 30. In this case, the lower surface of the sealing member 24 that forms the lower end of the water channel forming body 20 may be in close contact with the upper surface 30a of the structure 30 described above.

[0044] Step S24 may be performed, for example, as follows: A concrete nail 33 is driven into the concrete structure 30 so as to penetrate the retaining member 31 and the base 32, thereby fixing the retaining member 31 together with the base 32 to the structure 30. For example, as shown in FIG. 7A , the tip end portion of the concrete nail 33 is driven into the structure 30 so as to penetrate the first portion 31a of the steel plate 31 and the base 32. This sandwiches the first portion 31a of the steel plate 31 and the base 32 between the head of the concrete nail 33 and the structure 30, thereby fixing the first portion 31a of the steel plate 31 and the base 32 to the structure 30. The held portion 20b of the waterway formation body 20 is sandwiched and held between the second portion 31b of the steel plate 31 fixed in this way and the structure 30. Note that other portions of the base 32 on which the steel plate 31 is not placed are also fixed to the structure 30 with concrete nails.

[0045] In step 25, a formwork (not shown) is placed on the base 32, and a pouring area is defined by the base 32 (shield) and the formwork.

[0046] In step S3, concrete is poured into the pouring area to form the concrete body 10.

[0047] In step S4, once the concrete poured in step S3 has hardened, the formwork, retaining members 31, and base 32 are removed from the concrete skeleton 10 and the water channel forming body 20. The retaining members 31 and base 32 may be removed by pulling out the concrete nails 33. In step S4, the concrete skeleton 10 provided with the water channel forming body 20 is formed, for example, as shown in FIG. 3. In other words, a through water channel 20a that penetrates the concrete skeleton 10 is defined and formed by the water channel forming body 20.

[0048] (Effects of the embodiment) According to the above-described embodiment, the waterway forming body 20 is placed in the concrete pouring area so that the through space 20a penetrates the pouring area, and the retaining member 31 is placed so that it extends between outside the pouring area and inside the through space 20a. Then, the first portion 31a of the retaining member 31 is joined to a predetermined location outside the pouring area, thereby sandwiching and holding a portion of the waterway forming body 20 (held portion 20b) between the second portion 31b of the retaining member 31 located inside the through space 20a and the structure 30 that defines the pouring area. In this way, the retaining member 31 for holding the waterway forming body 20 is placed outside the range of the poured concrete (outside the pouring area and inside the through space 20a). Therefore, it is not necessary to consider the cover dimension for the retaining member 31.

[0049] After concrete is poured, the first portion 31a of the holding member 31 is removed from the predetermined location, and the holding member 31 is removed. Therefore, the holding member 31 no longer interferes with the through-channel 20a.

[0050] Furthermore, concrete nails 33 are driven into the concrete structure 30 so as to penetrate the retaining member 31 and the base 32, thereby fixing the retaining member 31 together with the base 32 to the structure 30. Therefore, the base 32 (e.g., a shim) and the retaining member 31 can be fixed simultaneously, improving the efficiency of the work of fixing the base 32 and the retaining member 31.

[0051] Furthermore, when the holding member 31 is a thin plate-like member, the holding member 31 can be easily fixed to the structure 30 together with the base 32 using concrete nails 33 .

[0052] The held portion 20b of the water channel forming body 20 is a portion that protrudes inward in the width direction. This allows the held portion 20b to be sandwiched between the holding member 31 and the structure 30.

[0053] The lower end of the water channel forming body 20 is formed by a sealing member 24 that seals the gap between the lower end and the upper surface 30a of the structure 30. This prevents concrete from flowing into the through channel 20a when pouring concrete in step S3 described above.

[0054] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention. For example, any of the following modified examples 1 to 4 may be adopted alone, or two or more of modified examples 1 to 4 may be adopted in any combination. In this case, the points not described below are the same as those described above.

[0055] (Change example 1) Figure 8 is a view corresponding to Figure 7B, but shows the case of modified example 1. That is, Figure 8 is a cross-sectional view of the water channel forming body 20 of modified example 1 taken along a plane perpendicular to the penetration direction of the through water channel 20a. In the above description, the through space 20a in the water channel forming body 20 is open to the side of the structure 30 (e.g., downward), but as shown in Figure 8, in the water channel forming body 20, the through space 20a does not have to be open to the side of the structure 30 (e.g., downward). The water channel forming body 20 according to modified example 1 may further have, for example, a lower wall 25 that closes from below. Also, in modified example 1, the sealing member 24 is omitted.

[0056] (Change example 2) FIG. 9A corresponds to FIG. 7B, but shows the case of Modified Example 2. That is, FIG. 9A is a cross-sectional view of the water channel forming body 20 of Modified Example 2 taken along a plane perpendicular to the penetration direction of the through water channel 20a. FIG. 9B is a view in which the retaining member 31 is omitted from FIG. 9A. As shown in FIG. 9B, the water channel forming body 20 may have a groove 26 formed in each of the first and second inner surfaces 22a, 23a in the penetration direction of the through space 20a. In this case, the above-mentioned intermediate surface portions 22a1, 23a1 are the bottom surfaces of the groove 26, and the lower surface portions 22a2, 23a2 extend downward from the groove 26. That is, in this Modified Example 2, the retained portion 20b is the portion of each of the first and second side walls 22, 23 that extends downward from the groove 26.

[0057] (Change example 3) Figures 10A to 10C correspond to Figure 7B, but show the case of Modified Example 3. That is, Figures 10A to 10C are cross-sectional views of the water channel forming body 20 of Modified Example 3 taken along a plane perpendicular to the penetration direction of the through water channel 20a. Figures 10A to 10C show water channel forming bodies 20 having different specific shapes.

[0058] 10A to 10C, the lower surface portions 22a2, 23a2 of the first and second inner surfaces 22a, 23a may extend inward in the width direction as they extend downward. As a result, the portions of the first and second inner surfaces 22a, 23a that are spaced apart less than the dimensions of the retaining member 31 in the width direction of the through-channel 20a become the lower surface portions 22a2, 23a2. In the water channel forming body 20, the portions that form the lower surface portions 22a2, 23a2 become the retained portions 20b.

[0059] In Modification 3, the cross section of lower side surface portions 22a2, 23a2 taken along a plane perpendicular to the penetration direction may be a curve (for example, an arc) or a straight line as shown in Fig. 10A. Also in Modification 3, through space 20a may be open to the side of structure 30 as shown in Figs. 10B and 10C, or may be closed without opening to the side of structure 30 as shown in Fig. 10A. In the latter case, sealing member 24 is omitted as shown in Fig. 10A.

[0060] (Change example 4) In the above example, the concrete structure 10 was a concrete wall (e.g., a foundation beam) separating adjacent rainwater storage tanks 8, but the concrete structure 10 to which the water channel formation 20 of the present invention can be applied is not limited to this.

[0061] For example, concrete skeleton 10 may be a concrete wall in an apartment building, and through channel 20a may be a drainage channel for draining rainwater. Figures 11A and 11B show an example of this case. Figure 11A is a plan view of a portion of an apartment building, showing a common corridor C, a private balcony B for each dwelling unit, and concrete wall 10. Figure 11B is a cross-sectional view taken along line 11B-11B in Figure 11A.

[0062] In FIG. 11A, concrete wall 10 is a wall that separates a common corridor C from a private balcony B of a dwelling unit in an apartment building. In FIG. 11B, concrete wall 10 is formed to rise from floor surface 30a of a slab serving as structural body 30. Floor surface 30a of slab 30 includes floor surface 30a1 of common corridor C and floor surface 30a2 of private balcony B. In FIG. 11B, penetration space 20a of waterway formation body 20 connects common corridor C and private balcony B to each other at the lower end of concrete wall 10. More specifically, penetration space 20a of waterway formation body 20 is connected from directly above to drainage ditch 41 on floor surface 30a of slab 30 that extends from common corridor C to private balcony B. [Explanation of symbols]

[0063] 7. Rainwater storage facilities 8. Rainwater storage tank 10 Concrete structure (concrete wall) 20 Channel formation 20A main unit 20a Penetration waterway (penetration space) 20a1 opening 20b Holding part 20b1 Top surface 20c Lower end surface 21 Upper wall 21a Upper inner surface 22 First side wall 22a First inner surface 22a1 Intermediate surface part 22a2 Lower side part 23 Second Side Wall 23a Second inner surface 23a1 Intermediate surface part 23a2 Lower side part 24 Sealing material 25 Lower wall 26 Groove 27 Connection part 27a Exterior 30 Structure (Slab) 30a Top surface (floor surface) 30a1 Common corridor floor 30a2 Private balcony floor 31 Retaining member 31a Part 1 31b Part 2 32 Base (shield) 33 Concrete Nails 41 Drain C Common Corridor B Private balcony

Claims

1. A method for installing a waterway forming body that is installed in a concrete skeleton and forms a through-channel, (A) preparing the water channel forming body that forms a through space that becomes the through water channel inside, and a holding member for holding the water channel forming body; (B) The water channel forming body is placed in the concrete pouring area so that the through space passes through the pouring area, and the retaining member is placed so as to extend from outside the pouring area to inside the through space. By connecting a first part of the retaining member to a predetermined location outside the pouring area, a part of the water channel forming body is sandwiched and held between a second part of the retaining member located within the through space and a structure that defines the pouring area. How to install the channel formation.

2. (C) After (B), the concrete body is formed by pouring concrete into the pouring area, and the through-channel is secured in the concrete body by the water channel forming body; (D) after (C), detaching the first portion of the holding member from the predetermined location and removing the holding member; A method for attaching the water channel forming body according to claim 1.

3. The concrete structure is a concrete wall, The structure that defines the pouring area forms a bottom surface of the pouring area, A method for attaching the water channel forming body according to claim 1.

4. In (B), the predetermined location to which the first portion of the retaining member is attached is a base of a formwork installed adjacent to the pouring area, In the step (B), a concrete nail is driven into the structure so as to penetrate the retaining member and the base, thereby fixing the retaining member together with the base to the structure. A method for attaching the water channel formation according to claim 3.

5. The holding member is a plate-shaped member. A method for attaching the water channel formation according to claim 4.

6. A waterway forming body that is provided in a concrete skeleton and forms a through-channel, and that is held by a predetermined holding member when pouring concrete to form the concrete skeleton, A through space is formed on the inside to become the through water channel that penetrates the concrete skeleton after the concrete is poured, The through-space is arranged so as to penetrate the concrete pouring area during concrete pouring, The retaining member is connected to a predetermined location outside the casting area and extends into the through space, and has a retained portion that is sandwiched and held between the retaining member and a structure that defines the casting area. Channel formation.

7. The held portion is sandwiched between the holding member and the structure forming the bottom surface of the concrete pouring area during concrete pouring, an upper inner surface located above the through-space; a first inner surface and a second inner surface located on both sides of the through-space in the width direction; The upper inner surface and the first and second inner surfaces define the through space, Each of the first and second inner surfaces has an intermediate surface portion located midway in the height direction and a lower surface portion located below the intermediate surface portion, The lower surface portion is shifted inward from the intermediate surface portion in the width direction of the through space, and the portion of the water channel formation that forms the lower surface portion is the held portion. The water channel forming structure according to claim 6.

8. an upper wall forming the upper inner surface; a first side wall extending downward from one end of the upper side wall in the width direction and forming the first inner surface; a second side wall extending downward from the other end of the upper side wall in the width direction and forming the second inner surface, Each of the first side wall and the second side wall has a portion of the lower surface portion that protrudes inward in the width direction beyond the intermediate surface portion as the held portion. The water channel formation according to claim 7.

9. The outer surfaces of the connection portions between the upper wall and each of the first and second side walls have a chamfered shape when viewed from the direction in which the through space penetrates the water channel forming body. The water channel forming structure according to claim 8.

10. The through space has an opening facing downward, and a lower end of the water channel forming body is formed by a sealing member that seals the space between the lower end and the bottom surface formed by the structure. The water channel formation according to claim 7.

11. The lower surface portion of each of the first and second inner surfaces extends inward in the width direction as it transitions downward. The water channel formation according to claim 7.

12. a groove formed in each of the first and second inner surfaces in a direction in which the through space extends; The intermediate surface portion is a bottom surface of the groove, and the lower surface portion extends downward from the groove. The water channel formation according to claim 7.

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