Water collection device

Abstract

The objective is to provide a water collection device that collects water from an opening formed in a reinforced concrete slab, comprising a formwork unit for forming an opening in the slab, and a water collection unit attached to and supported on the formwork unit side and on the opening side, and having a high degree of design flexibility. [Solution] The formwork unit has a plurality of formwork reinforcing bars and one or more support reinforcing bars that extend from the cylindrical part formed by the combined plurality of formwork reinforcing bars to the slab reinforcing bars arranged in the slab and support the formwork reinforcing bars to the slab side. The water collection unit has a water collection body and a support member that suspends and supports the water collection body to the formwork unit side. The support member is detachably engaged with the portion of the formwork unit that is exposed to the opening and supports the water collection body, which is positioned in the space on the lower side of the slab, at a position where, when viewed from below, at least a part of the area where the opening is open overlaps.

Description

Technical Field

[0001] The present invention relates to a water collecting device for collecting water in an opening formed in a slab.

Background Art

[0002] A technique for forming an opening called a "drain hole" in a reinforced concrete slab has been conventionally known.

[0003] Specifically, first, slab reinforcing bars (slab rebars) are arranged, and a range where an opening is to be formed or a slightly wider range including the same is set as a non-reinforced area. Then, formwork units are supported by the slab rebars with the formwork units positioned on the non-reinforced area side, and a bar placing operation is performed. The formwork unit has a plurality of formwork reinforcing bars combined so that a cylindrical portion is formed, and one or more support reinforcing bars extending from the cylindrical portion side to the slab rebar side and supporting the formwork reinforcing bars on the slab side. After this bar placing operation, a placing operation is performed to form a reinforced concrete slab in which an opening along the cylindrical portion of the formwork unit is formed.

[0004] The floor surface of the upper floor is formed on the upper surface side of this slab, and the ceiling surface of the lower floor is formed on the lower surface side thereof. The opening formed there is used for passing tools, materials, etc. between the upper and lower floors. Such a conveniently used opening is blocked with concrete when the construction of the lower floor has progressed to a certain extent or when the construction is completed.

[0005] While this opening has the above-mentioned advantages, during the period from the formation of the opening to its blocking, water on the upper floor may unintentionally flow into the lower floor. To prevent this, a water collecting device is known that includes the above-mentioned formwork unit and a water collecting unit attached and supported on the formwork unit side, and prevents water leakage to the lower floor by collecting water on the opening side into the water collecting unit (see, for example, Patent Document 1).

[0006] The water collection unit of the water collection device described in the above document comprises a funnel-shaped water collection body, and on the upper edge of this water collection body, which forms an annular shape in plan view, a flange-shaped support portion is integrally formed along its entire circumference, projecting horizontally outward. The water collection body is inserted from above into the space on the inner circumferential surface side of the cylindrical part of the formwork unit, and the support portion is hooked onto the part exposed in the opening of the formwork unit, thereby allowing the water collection body to be detachably attached and supported to the formwork unit.

[0007] Therefore, the formwork unit must be configured so that the water collection body can be inserted into the cylindrical part, which imposes significant constraints on the shape of the formwork unit and the water collection unit. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-132464 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention provides a water collection device that collects water from an opening formed in a reinforced concrete slab, comprising a formwork unit for forming an opening in the slab, and a water collection unit attached to and supported on the formwork unit side and on the opening side, and aims to provide a water collection device with a high degree of design flexibility. [Means for solving the problem]

[0010] To solve the above problems, the present invention provides a formwork unit for forming an opening in a reinforced concrete slab, and a water collection unit attached to and supported on the formwork unit side and for collecting water from the opening side, wherein the formwork unit comprises a plurality of formwork reinforcing bars assembled to form a cylindrical portion along the inner circumferential surface of the opening, and one or more support reinforcing bars extending from the cylindrical portion side to the slab reinforcing bars arranged in the slab and supporting the formwork reinforcing bars on the slab side, wherein the water collection unit comprises a water collection body for collecting water and a support member for suspending and supporting the water collection body on the formwork unit side, wherein the support member is detachably engaged with the portion of the formwork unit exposed to the opening, and supports the water collection body, which is positioned in the space on the lower surface side of the slab, at a position where, in a bottom view, at least a portion overlaps with the area where the opening is formed.

[0011] The water collection body may be formed to a size that covers the entire opening when viewed from below, and the water collection body may be suspended and supported by the support member on the formwork unit side so as to close the opening from the lower side of the slab.

[0012] The support member may be configured to elastically suspend and support the water collection body on the formwork unit side while pressing it against the lower surface of the slab.

[0013] An annular sealing material may be provided on the upper surface of the water collection body along the periphery of the opening, and the sealing material may be interposed between the upper surface of the water collection body and the lower surface of the slab when the water collection body is supported by the support member, in order to prevent water leakage from between them.

[0014] The water collection unit may have an auxiliary member that connects the water collection body and the formwork unit, and the auxiliary member may be configured to suspend and support the water collection body on the formwork unit side even when the water collection body is not supported on the formwork unit side by a support member.

[0015] The water collection body comprises a water collection side frame and a sheet that is attached to the water collection side frame and is flexibly deformable, and the support member may be attached to the water collection side frame side of the water collection body. [Effects of the Invention]

[0016] The water collection body can be supported by a support member that is detachably engaged with the portion of the formwork unit that is exposed at the opening, in a location where water from the opening can be collected in the space on the underside of the slab, where there are fewer shape constraints. This reduces the need to mold the water collection body and the formwork unit into corresponding shapes, and increases the design freedom of the formwork unit and the water collection unit.

[0017] Furthermore, the structure that allows the water collection unit to be engaged with the formwork unit in a way that enables it to be detached from the formwork unit simplifies the process of attaching and detaching the water collection unit to the formwork unit. [Brief explanation of the drawing]

[0018] [Figure 1] This is a plan view showing the configuration of the water collection device. [Figure 2] This is a cross-sectional view of the main components of the water collection device. [Figure 3] This is a disassembled side cross-sectional view showing the configuration of the water collection device. [Figure 4] (A) is a plan view showing the configuration of the water collection side frame, and (B) is a side cross-sectional view showing the main components of the water collection unit. [Figure 5] This is an exploded view showing the structure of the water collection unit. [Modes for carrying out the invention]

[0019] Figs. 1 to 3 are a plan view, a front cross-sectional view of the main part, and a side exploded cross-sectional view showing the configuration of the water collection device. The illustrated water collection device includes a formwork unit 3 that is a formwork for forming an opening 2 called a "dam hole" when forming a slab 1 by casting, and a water collection unit 4 that is detachably attached and supported to the formwork unit 3.

[0020] In the illustrated example, the reinforced concrete slab 1 is formed by flowing fresh concrete into a frame in which reinforcing bars (slab reinforcing bars) 6 are arranged in a grid pattern and curing (casting) it. The slab reinforcing bars 6 are arranged (reinforced) in a reinforced area E2 that is a range other than the non-reinforced area E1, which is a range including or slightly wider than the range where the opening 2 is formed, within the frame. The formwork unit 3 is arranged on the non-reinforced area E1 side while being supported by the slab reinforcing bars 6 before casting.

[0021] The formwork unit 3 includes a plurality of formwork reinforcing bars 8 and 9 combined so that a cylindrical portion 3a in the vertical direction along the rectangular opening 2 is formed in plan view, a plurality of support reinforcing bars 11 combined in a cross shape at the upper and lower portions of the formwork reinforcing bars 8 and 9 and extending from the cylindrical portion 3a side toward the slab reinforcing bars 6 side, a plurality of opening-side reinforcing bars 12, and a pair of upper and lower wooden frame bodies 13 and 14 having a rectangular frame in plan view and having vertical lengths corresponding to the respective thicknesses (cover thicknesses) from the slab reinforcing bars 6 to the upper and lower surfaces of the slab 1.

[0022] Here, for the sake of convenience, the longitudinal direction of the opening 2 is defined as the left-right direction, and the front and back are defined based on this.

[0023] As the formwork reinforcing bars 8 and 9, horizontal crossbars 8 and vertical bars 9 are provided.

[0024] Multiple sets of four horizontal reinforcing bars 8 are provided. The four horizontal reinforcing bars 8 in each set are arranged in a grid pattern and connected and fixed to each other by welding or wire, etc., to form a planar unit 16. Multiple planar units 16 are arranged vertically side by side such that the rectangular frame portion 16a (the entire unit in this example), which is at least a part of the grid pattern, coincides or nearly coincides in a plan view.

[0025] The vertical reinforcing bars 9 are provided one or more (two in the illustrated example) at each of the four corners of the rectangular frame section 16a of the planar unit 16 in a planar view. The upper and lower planar units 16 are attached and fixed to each vertical reinforcing bar 9. The assembly of formwork reinforcing bars 8 and 9 assembled in this way forms the cylindrical section 3a described above by the multiple rectangular frame sections 16a arranged above and below it.

[0026] The supporting reinforcing bars 11 are arranged in sets of four, aligned horizontally, and the four supporting reinforcing bars 11 in each set are combined in a grid pattern, similar to the horizontal reinforcing bars 8, to form a planar unit 17. Multiple planar units 17 are provided (two in this example). The multiple planar units 17 are arranged vertically side by side such that the rectangular frame portion 17a (the entire rectangular frame portion in this example), which is at least a part of the grid pattern, coincides or substantially coincides in a plan view.

[0027] One of the pair of upper and lower planar units 17 is attached and fixed to the lower surface of the uppermost planar unit 16, and the other is attached and fixed to the upper surface of the lowermost planar unit 16. Incidentally, the upper and lower planar units 17 are connected and fixed to each other by a connecting frame 15 in the vertical direction.

[0028] When the formwork unit 3 is assembled, the rectangular frame section 17a of the planar unit 17, which consists of support bars 11, is shaped and sized to fit completely within the frame of the rectangular frame section 16a of the planar unit 16, which consists of formwork bars 8, in a planar view. Incidentally, these two types of rectangular frame sections 16a and 17a are oriented in the left-right direction, with their centers coinciding and their longitudinal directions being the same.

[0029] At both ends of the horizontal reinforcement bar 8 and the support reinforcement bar 11, U-shaped anchor portions 8a and 11a are integrally formed by bending or other means. These anchor portions 8a and 11a are locked into the concrete after casting. Furthermore, due to the above-described configuration, the horizontal reinforcement bar 8 and the support reinforcement bar 11 protrude outward from the cylindrical portion 3a, but the amount of protrusion is greater for the support reinforcement bar 11 than for the horizontal reinforcement bar 8.

[0030] Before concrete pouring, the formwork unit 3 is positioned and supported on the non-reinforced area E1 side by placing its respective vertical reinforcement bars 9 and each rectangular formwork section 16a, 17a in the non-reinforced area E1, and then placing the anchor sections 11a, 11a on both sides of the supporting reinforcement bars 11 on the grid-like arrangement of slab reinforcement bars 6.

[0031] The upper frame 13 has a vertical length corresponding to the thickness from the uppermost slab reinforcement 6 to the top surface of the slab, and in plan view it is a rectangular frame along the cylindrical part 3a, and is locked to the upper end of the cylindrical part 3a with its position aligned or nearly aligned with the frame 14 and the cylindrical part 3a.

[0032] The lower frame 14 has a vertical length corresponding to the thickness from the bottommost slab reinforcement 6 to the bottom surface of the slab, and when viewed from the bottom, it has a rectangular frame shape along the cylindrical part 3a, and is locked to the upper end side of the cylindrical part 3a with its position aligned or nearly aligned with the frame 14 and the cylindrical part 3a.

[0033] The opening-side reinforcing bars 12 are oriented with their longitudinal direction perpendicular to the longitudinal direction of the rectangular frame sections 16a and 17a (specifically, in the front-to-back direction), and are installed between a pair of front-to-back supporting reinforcing bars 11, 11 that extend in the longitudinal direction of the planar unit 17, in a state that allows them to slide in the longitudinal direction (left-to-right). Incidentally, multiple opening-side reinforcing bars are attached and supported to one or both of the upper and lower planar units 17 for each planar unit 17.

[0034] With the formwork unit 3 supported by the slab reinforcement bars 6 arranged in a grid pattern within the frame, as described above, a concrete pouring operation is performed in which ready-mix concrete is poured into the frame and hardened, thereby forming a slab 1 with an opening 2.

[0035] Specifically, ready-mix concrete is poured into the entire reinforcement area E2, the space on the outer periphery side of the upper and lower frame structures 13 and 14 in the non-reinforcement area E1, and the space on the outer periphery side of the cylindrical section 3a in the non-reinforcement area E1, and allowed to harden. At the same time, the space on the inner periphery side of the cylindrical section 3a and the space on the inner periphery side of the upper and lower frame structures 13 and 14 form the opening 2.

[0036] Furthermore, to prevent or suppress the flow of ready-mix concrete into the space on the inner surface side of the cylindrical section 3a from between the horizontally arranged reinforcing bars 8,8 during pouring, the entire circumference of the cylindrical section 3a may be covered with a mesh sheet. Also, after pouring, the frame bodies 13 and 14 may be removed in the same way as normal formwork.

[0037] On the other hand, when closing the opening 2 with concrete after use, the multiple reinforcing bars 12 on the opening side are slid so that they are arranged in parallel at equal intervals on the opening 2 side, and then ready-mix concrete is poured into the opening 2 and allowed to harden, thereby closing the opening 2 with reinforced concrete.

[0038] Figure 4(A) is a plan view showing the configuration of the water collection side frame, and (B) is a side cross-sectional view showing the main components of the water collection unit. Figure 5 is an unfolded view showing the configuration of the water collection body. As shown in Figures 1 to 5, the water collection unit 4 includes a water collection body 18 that collects water present on the side of the opening 2, and a plurality of support members 19 that elastically suspend and support the water collection body 18 from the formwork unit 3 while it is positioned in the space on the lower side of the slab 1.

[0039] The water collection body 18 has a water collection side frame 21 that forms its skeleton and a sheet 22 that is attached to the water collection side frame 21 and is flexibly deformable, and the whole body is molded into a rectangular shape that covers the entire opening 2 when viewed from below. An annular sealing material 23 is provided around the entire circumference of the upper edge of the water collection body 18.

[0040] The water collection side frame 21 has a rectangular frame-shaped frame frame 24 and a plurality of reinforcing frames 26 (three in the illustrated example) installed between the frame frames 24.

[0041] The frame 24 has a longitudinal direction in the left-right direction, which is the same direction as the opening 2, with its long side being slightly longer than the long side of the opening 2, and its short side being slightly longer than the short side of the opening 2. Each reinforcing frame 26 is formed in a direction parallel to the short side of the frame 24 and is installed and fixed between a pair of front and rear long sides of the frame 24. Multiple reinforcing frames 26 are arranged at equal intervals in the longitudinal direction of the frame 24.

[0042] The sheet 22 integrally comprises a rectangular main body 27 that follows the outer edge of the frame 24, and four flap-like extensions 28, 28, 28, 28 extending outward from each of the four sides of the main body 27. With the frame 24 placed on the upper surface of the main body 27 of the sheet 22, the sheet 22 is attached and fixed to the frame 24 by folding each extension 28 back towards the upper surface of the frame 24 and locking it to the frame 24.

[0043] The sealing material 23 has an annular shape that follows the peripheral edge of the opening 2 (the inner circumferential surface of the opening 2 when viewed from the bottom), and is provided on the peripheral edge of the upper surface of the water collection body 18. Incidentally, the sealing material 23 and the opening 2 are formed such that the opening 2 can be completely contained within the annular shape of the sealing material 23 when viewed from the bottom.

[0044] The support member 19 has a suspension portion 29, such as a suspension string, and a hook portion (engaging portion) 31 provided on one end of the suspension portion 29. The suspension portion 29 is made of an elastic material so as to be elastically expandable and contractible in the direction of its formation.

[0045] The support members 19 described above are provided at symmetrical positions with respect to the midpoint of the formation direction (front-to-back direction) of each reinforcing frame 26, with the end opposite the hook portion 31 of the suspension portion 29 attached and fixed. In other words, two support members 19 are provided for each reinforcing frame 26.

[0046] The water collection unit 4, configured as described above, is positioned in the space on the underside of the slab 1, and is attached and supported to the formwork unit 3 by hooking the hook portions 31 of the multiple support members 19 onto the portions exposed to the opening 2 in the formwork unit 3 (specifically, the front and rear long sides of the rectangular frame portion 17a of one of the upper or lower planar units 17 (the upper side in this example)) and engaging them in a way that allows for detachable engagement.

[0047] More specifically, an equal number (three in this example) of support members 19 are individually engaged with the front and rear long sides of the rectangular frame portion 17a. At this time, the suspension portion 29 of each support member 19 elastically deforms in the extension direction, and as a result, the water collection unit 4 is elastically suspended and supported from the formwork unit 3, with the annular peripheral edge of the upper surface of the water collection body 18 elastically pressing against the lower surface of the slab 1. In this state, a sealing material 23 is continuously interposed around the entire circumference between the annular peripheral edge of the upper surface of the water collection body 18 and the lower surface of the slab 1, preventing and suppressing water leakage from the gap formed between them.

[0048] In this manner, the water collection unit 4, which is suspended and supported, collects water from the opening 2 into the central part of the sheet 22 of the water collection body 18. The sheet 22 deforms so that its central part bulges slightly downward relative to the periphery due to the weight of the collected water, preventing the collected water from flowing to the periphery.

[0049] Incidentally, the water collected in the central part of the water collection body 18 flows into the hose 33 via the discharge section 32 located near the center of the water collection body 18, flows through the hose 33 to the desired location, and is then discharged to the outside.

[0050] In the illustrated example, the discharge section 32 is located in a position that overlaps with the central reinforcing frame 26 in a plan view, but it may also be positioned to one side in the overall length direction.

[0051] Furthermore, the water collection unit 4 is provided with an auxiliary member 34 that connects the water collection body 18 and the formwork unit 3. The auxiliary member 34 is configured to suspend and support the water collection body 18 from the formwork unit 3 when all the support members 19 are not engaged with the formwork unit 3.

[0052] Specifically, the auxiliary member 34 is detachably connected to a portion of the formwork unit 3 that is exposed to the opening 2 (specifically, the long side portion of the rectangular frame portion 17a of one of the upper or lower planar units 17 (the upper side in this example)) by a suspension portion 36, such as a string, which has one end that is secured to the central reinforcing frame 26, and a connector 37, such as a carabiner, provided on the opposite end of the suspension portion 36 that is secured to the reinforcing frame 26.

[0053] The suspension portion 36 of this auxiliary member 34 loosens when the water collection body 18 is supported by multiple support members 19 on the formwork unit 3, and becomes in a state where it does not support the formwork unit 3 (a non-functioning state).

[0054] To explain how the auxiliary member 34 is used, first, a worker on the upper floor, separated by the slab 1, takes the auxiliary member 34 and drops the water collection body 18 through the opening 2 to the lower floor. Then, the worker lifts the water collection body 18 and presses the upper side of the water collection body 18 against the lower side of the slab 1. In this state, the hook portions 31 of each support member 19 are hooked onto the formwork unit 3 for support. Finally, the connecting member 37 is also secured to the formwork unit 3, thereby completing the installation of the water collection unit 4.

[0055] With the water collection device configured as described above, it becomes possible to support the water collection unit 4 on the formwork unit 3 side by reducing the constraints imposed by the shape of the opening 2 and the configuration and space of the formwork unit 3. [Explanation of Symbols]

[0056] 1 Slab 2. Opening (dead hole) 3 Formwork Units 4. Water collection unit 6. Slab reinforcement 3a Cylindrical part 8. Horizontal reinforcing bars (formwork reinforcing bars) 9. Vertical reinforcement (formwork reinforcement) 11 Supporting reinforcement 18 Water collection unit 19 Support Member 21 Water collection side frame 22 seats 23. Sealant 34 Auxiliary members

Claims

1. A formwork unit for forming an opening in a reinforced concrete slab, The system includes a water collection unit that is attached to and supported on the formwork unit side and collects water from the opening side, The formwork unit comprises a plurality of formwork reinforcing bars assembled to form a cylindrical portion along the inner circumferential surface of the opening, and one or more support reinforcing bars extending from the cylindrical portion side to the slab reinforcing bars arranged within the slab and supporting the formwork reinforcing bars toward the slab side. The water collection unit comprises a water collection body for collecting water and a support member for suspending and supporting the water collection body on the formwork unit side. The support member is detachably engaged with the portion of the formwork unit that is exposed to the opening, and supports the water collection body, which is positioned in the space on the lower side of the slab, at a position that overlaps with at least a portion of the area where the opening is located when viewed from below. Water collection device.

2. The water collection body is formed to a size that covers the entire opening when viewed from the bottom, The water collection body is suspended and supported by the support member toward the formwork unit so as to close the opening from the lower surface side of the slab. The water collection device according to claim 1.

3. The support member is configured to elastically suspend and support the water collection body on the formwork unit side while pressing it against the lower surface of the slab. The water collection device according to claim 2.

4. An annular sealing material is provided on the upper surface of the water collection body, along the peripheral edge of the opening. The sealing material is interposed between the upper surface of the water collection body and the lower surface of the slab when the water collection body is supported by the support member, thereby preventing water leakage from between them. A water collection device according to either claim 2 or 3.

5. The water collection unit has an auxiliary member that connects the water collection body and the formwork unit. The auxiliary member is configured to allow the water collection body to be suspended and supported on the formwork unit side even when the water collection body is not supported on the formwork unit side by the support member. The water collection device according to claim 1.

6. The water collection body comprises a water collection side frame and a sheet that is attached to the water collection side frame and is flexibly deformable. The support member is attached to the water collection side frame of the water collection body. The water collection device according to claim 1.

Images