Slab joint surface smoothing tool and slab joint surface smoothing method using the same

Abstract

To omit the smoothing work of the joint surface after concrete placement and to obtain a slab of good quality. [Solution] A slab joint surface smoothing method for smoothing the concrete joint surfaces when concrete is poured sequentially into multiple partitioned areas to finish the entire slab involves identifying the position of the joint surface, fixing a support member 20 to the reinforcing bar 100 at a position a predetermined distance horizontally from the position of the joint surface, placing a partition plate 10 for partitioning the area at the position of the joint surface and connecting it to the support member 20, and then pouring concrete into the area.

Description

[Technical Field]

[0001] The present disclosure relates to a slab joint surface smoothing tool for smoothing concrete joint surfaces and a slab joint surface smoothing method using the same. [Background technology]

[0002] For example, when constructing a slab for a large-scale facility, it is not possible to pour concrete over the entire area at once, so the pouring area is divided into multiple sections, concrete is poured into each section, and this pouring work is repeated to complete the entire slab. When pouring concrete into each section, concrete stop frames are used to divide the concrete pouring area, as disclosed in Patent Document 1, for example.

[0003] Furthermore, Patent Document 2 discloses a jig that can be used in place of the concrete retaining frame of Patent Document 1, which is made of a rectangular prism-shaped sponge housed in a resin bag. By lining up these jigs, it becomes possible to partition the area where concrete is poured. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-172785 [Patent Document 2] Patent No. 4958081 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when using the concrete retaining frame of Patent Document 1, a problem arises as to how to secure the concrete retaining frame on-site. In particular, when concrete is poured, high concrete flow pressure acts on the concrete retaining frame, and it is necessary to ensure that the frame does not shift from its fixed position or collapse even when subjected to such high flow pressure. There is no specific disclosure in Patent Document 1 regarding this point.

[0006] On the other hand, in Patent Document 2, a jig containing a rectangular prism-shaped sponge housed in a resin bag is supported by a backup member, which is thought to allow the jig to be positioned so that it can withstand the high flow pressure of concrete. However, because the jig is made of sponge, it is inevitable that it will deform when the concrete flow pressure acts on it, making it difficult to prevent concrete from seeping in between adjacent jigs. When the concrete that has seeped in between the jigs hardens, the joint surface becomes messy. Therefore, after the joint is placed, the cover portion corresponding to the top of the joint surface must be scraped off to smooth it, which is time-consuming. This requires a huge amount of work, especially at large-scale construction sites, so there is a strong demand for eliminating the smoothing process.

[0007] Therefore, focusing on the fact that reinforcing bars are placed before concrete is poured, it is conceivable to arrange square bars 200, also known as crosspieces or square battens, horizontally so as to cover the upper side of the jig 300 of Patent Document 2, as shown in Fig. 23, and then tie and fix the square bars 200 to the reinforcing bars 100 with binding wires or the like, thereby defining the cover portion of the concrete pouring area with the square bars 200. If the square bars 200 are fixed to the reinforcing bars 100, they will not shift due to the flow pressure of the concrete, and will not deform due to the flow pressure of the concrete as with the jig 300 using a sponge in Patent Document 2, and it is thought that this will enable the smoothing of the joint surface.

[0008] However, since square timbers 200 such as crosspieces and square battens have a long outer dimension W, when the square timbers are removed after the concrete joint is poured, as shown in Figure 24, a large step 400 corresponding to the outer dimension W of the square timber is created on the joint surface.The creation of this step 400 makes the completed slab more susceptible to cracks, resulting in poor quality.

[0009] The present disclosure has been made in consideration of these points, and its purpose is to eliminate the need for smoothing the joint surface after pouring concrete and to obtain a slab of good quality. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the present disclosure can be based on a slab joint surface smoothing tool that smooths the concrete joint surface when arranging concrete joints to form a concrete joint surface. The slab joint surface smoothing tool is arranged on the reinforcing bars so as to extend in the direction of arrangement of the concrete joints, and includes a partition plate that partitions the area where concrete is to be poured, a support member that is fixed to the reinforcing bars at a position a predetermined distance horizontally outside the area from the position that will become the joint surface, and a connecting member that connects the partition plate and the support member. With this configuration, the area where the concrete will be poured is defined by the partition plate. At this time, the support members that support the partition plate are fixed at a position a predetermined distance horizontally from the position where the joint will be, so the fixed positions of the support members to the rebar are separated from the partition plate, and the support members function as legs of the partition plate. This stabilizes the partition plate and makes it less likely to shift from its fixed position or to fall over due to the flow pressure of the concrete.

[0011] Furthermore, by using partition plates, it is possible to make them thinner than when conventional square timbers are used, which makes it less likely that steps will be created when the partition plates are removed after the concrete has been poured, and reduces the occurrence of cracks in the slab.

[0012] Furthermore, because the partition plate does not deform due to the flow pressure of the concrete, as with conventional sponge-based jigs, a smooth joint surface can be obtained simply by removing the partition plate after pouring the concrete. This eliminates the need to scrape the cover to smooth it after pouring, significantly reducing the amount of work required, especially at large-scale construction sites.

[0013] When fixing the support member to the reinforcing bar, a clamping member for fixing the support member to the reinforcing bar can be used. For example, by fastening a first clamping member and a second clamping member that clamp the reinforcing bar in the radial direction with a fastening member in a direction in which they approach each other, the first clamping member and the second clamping member can clamp both the reinforcing bar and the support member. This makes it easy to adjust the fixing position of the support member relative to the reinforcing bar, so the support member can be reliably fixed in a desired position relative to the reinforcing bar.

[0014] The support member may be an angle iron having a first plate portion and a second plate portion that are integrated and perpendicular to each other. In this case, the angle iron can be installed so that it extends in the same direction as the joint surface and the first plate portion is placed on the reinforcing bar, and the first plate portion of the angle iron can be clamped together with the reinforcing bar by the first clamping member and the second clamping member.

[0015] The partition plate can also be connected to the support member by engaging the second plate portion with the angle engagement portion of the connector and fitting the partition plate into the partition plate fitting portion of the connector, thereby making it possible to easily connect the partition plate to the support member.

[0016] A vertically long jig for stopping the flow of concrete can be placed and fixed between the partition plate and the angle bar.

[0017] The connecting member may be provided with an angle engaging portion for engaging the second plate portion, and a partition plate fitting portion for fitting the partition plate, thereby ensuring reliable engagement of the second plate portion.

[0018] The concrete slab joint surface smoothing device may also include a partition plate that is arranged on the reinforcing bars so as to extend in the direction of the arrangement of the concrete joint material and that defines the area where the concrete will be poured, and leg members that protrude from the partition plate outside the area and are fixed to the reinforcing bars to support the partition plate. With this configuration, the partition plate can be stably supported by the leg members.

[0019] The partition plate and the leg members may be made of metal. In this case, the base end of the leg member may be connected to the partition plate, and the portion of the leg member that protrudes outside the region may be a fixed portion that is fixed to the reinforcing bar with a binding wire. This allows the fixed portion to be fixed to the reinforcing bar with the binding wire, improving workability during fixing.

[0020] Another aspect of the present disclosure may be a slab joint surface smoothing method for smoothing a concrete joint surface when arranging concrete joint materials to form a concrete joint surface using the slab joint surface smoothing tool. [Effects of the Invention]

[0021] As described above, according to the present disclosure, it is possible to reduce the number of work steps by omitting the work of smoothing the joint surface after pouring concrete, and to obtain a slab of good quality. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view showing an installed state of a slab joint surface smoothing tool according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the fixing bracket. [Figure 3] FIG. 3 is a view of the fastening fitting in a state in which the support member is fixed to the reinforcing bar, viewed along the axial direction of the reinforcing bar. [Figure 4] FIG. 4 is a view of the fastening fittings in a state in which the support member is fixed to the reinforcing bar, viewed along the longitudinal direction of the support member. [Figure 5] FIG. 5 is an exploded perspective view of the connecting portion. [Figure 6] FIG. 6 is a perspective view of a connector used when the distance between the support member and the partition plate is long. [Figure 7] FIG. 7 is a perspective view of a connector used when the distance between the support member and the partition plate is short. [Figure 8] FIG. 8 is a perspective view illustrating a process of fixing the support member to the reinforcing bar with the fixing metal fittings. [Figure 9] FIG. 9 is a perspective view illustrating a process of fastening the support member with a fixing fixture. [Figure 10] FIG. 10 is a perspective view illustrating a process of connecting the partition plate to the support member with the connecting tool. [Figure 11] FIG. 11 is a perspective view showing the state in which a jig for stopping concrete is installed. [Figure 12] FIG. 12 is a diagram corresponding to FIG. 1 according to the first modification of the first embodiment of the present invention. [Figure 13] FIG. 13 is a diagram corresponding to FIG. 6 according to the first modification of the first embodiment of the present invention. [Figure 14] FIG. 14 is a diagram corresponding to FIG. 1 according to the second modification of the first embodiment of the present invention. [Figure 15] FIG. 15 is a diagram corresponding to FIG. 6 according to the second modification of the first embodiment of the present invention. [Figure 16] FIG. 16 is a diagram corresponding to FIG. 1 according to the third modification of the first embodiment of the present invention. [Figure 17] FIG. 17 is a diagram corresponding to FIG. 6 according to the third modification of the first embodiment of the present invention. [Figure 18] FIG. 18 is a diagram corresponding to FIG. 1 according to the fourth modification of the first embodiment of the present invention. [Figure 19] FIG. 19 is a view corresponding to FIG. 1 according to the second embodiment of the present invention. [Figure 20] FIG. 20 is a side view of a slab joint surface smoothing tool according to the second embodiment of the present invention. [Figure 21] FIG. 21 is a plan view of a slab joint surface smoothing tool according to the second embodiment of the present invention. [Figure 22] FIG. 22 is a side view showing a state in which a slab joint surface smoothing device according to the second embodiment of the present invention is fixed to a reinforcing bar. [Figure 23] FIG. 23 relates to a conventional example and is a diagram illustrating the case where square timber is used. [Figure 24] FIG. 24 is a view showing a state in which the square timber has been removed according to a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0024] (Embodiment 1) FIG. 1 is a perspective view showing an installed state of a slab joint surface smoothing tool 1 according to a first embodiment of the present invention. The slab joint surface smoothing tool 1 is a tool used when constructing a slab (floor slab), and by using this slab joint surface smoothing tool 1, a slab joint surface smoothing method can be realized. A slab is a reinforced concrete structure, and can also be called a structural floor. As shown in FIG. 1, a plurality of reinforcing bars 100 of the slab are arranged parallel to each other. Although not shown in FIG. 1, reinforcing bars 100 are generally arranged vertically and horizontally, and are also arranged at the upper and lower levels of the slab. Concrete is poured as a cover on top of the uppermost reinforcing bar 100 so as to cover the reinforcing bar 100.

[0025] When constructing a slab for a large-scale facility, it is not possible to pour concrete over the entire area in one go, so the pouring area is divided into multiple areas, and concrete is poured in each area. This pouring process is repeated until the entire slab is complete. When using this method, for example, after the concrete in one area has been poured and hardened, a pour joint is formed on the side of the concrete in that area, and another area adjacent to this pour joint is partitioned off and concrete is poured there. The slab joint surface smoothing tool 1 and slab joint surface smoothing method according to this embodiment are used to smooth the concrete pour joints when pouring concrete sequentially into multiple partitioned areas to finish the entire slab.

[0026] In Figure 1, the area where concrete will be poured is indicated by the symbol R, and the upper right area of ​​the page is the area where concrete will be poured R. On the other hand, the lower left area of ​​the page is outside of area R, and is the area where concrete will be poured after pouring into area R has been completed.

[0027] The slab joint surface smoothing device 1 includes a partition plate 10, a support member 20, a fixing bracket 30, and a connector 40. The partition plate 10 may be made of any plate material, and the partition plate 10 in this embodiment is made of plywood. The plywood may be painted plywood, with the surface that comes into contact with the concrete being painted. The partition plate 10 may also be made of a wooden plate other than plywood, a metal plate, a resin plate, or a composite material that combines these. The length of the partition plate 10 can be set as desired. Multiple partition plates 10 can also be used by lining them up lengthwise. The vertical dimension of the partition plate 10 can be set to, for example, approximately 10 cm, but this dimension can be set appropriately depending on the site.

[0028] The partition plate 10 is positioned on the reinforcing bar 100 so as to extend horizontally and vertically, and is a component for partitioning the area R where the concrete cover will be poured. That is, the partition plate 10 is installed at a position that will become the pour joint surface of the concrete cover, and the vertical dimension of the partition plate 10 is set to be sufficiently longer than the thickness of the cover. The imaginary line indicated by the reference numeral 110 in FIG. 1 indicates the pour joint surface of the concrete cover. By installing the partition plate 10 along this imaginary pour joint surface 110, the pour joint surface of the concrete cover can be obtained by removing the partition plate 10 after pouring the concrete. Before pouring the concrete, the imaginary pour joint surface 110 can be imagined at the position that will become the pour joint surface of the concrete cover. The position of the imaginary pour joint surface 110 can be identified, for example, by a design drawing or the like.

[0029] The surface of the partition plate 10 that comes into contact with the concrete is flat. Therefore, simply removing the partition plate 10 after pouring the concrete provides a smooth joint surface without the need for special smoothing work. The thickness of the partition plate 10 is set to be significantly shorter than the vertical dimension, and is not particularly limited, but is, for example, in the range of 3 mm to 30 mm. This thickness makes it sufficiently thinner than the square timbers that have been used conventionally. Therefore, when the partition plate 10 is removed after pouring the concrete, steps are less likely to form, and cracks in the slab are suppressed.

[0030] As described above, the occurrence of cracks can be suppressed by using a partition plate 10 that is thinner than square timber, but the problem is how to firmly fix such a thin partition plate 10 to the reinforcing bar 100 so that it does not shift position even when the flow pressure of the concrete acts on it and does not fall over. The slab joint surface smoothing device 1 of this embodiment is configured so that even a thin partition plate 10 can be firmly fixed to the reinforcing bar 100 so that it does not shift position and does not fall over. The specific configuration will be described below.

[0031] (Configuration of support member 20) The support member 20 is composed of an angle bar having a first plate portion 21 and a second plate portion 22 that are integrated and perpendicular to each other. When viewed from the longitudinal direction of the support member 20, the first plate portion 21 and the second plate portion 22 form an L shape, so the angle bar can also be called an L-shaped angle bar. The material of the support member 20 is not particularly limited, but examples include steel.

[0032] The support member 20 is installed at a position a predetermined distance horizontally outside the region R from the position that will become the concrete joint surface (the position of the imaginary joint surface 110), and is fixed to the reinforcing bar 100 by a fixing bracket 30, which will be described later. The longitudinal direction of the support member 20 is aligned with the extension direction of the concrete joint surface (imaginary joint surface 110), and the support member 20 is installed so that the support member 20 and the concrete joint surface extend in the same direction.

[0033] The support member 20 is installed so that the first plate portion 21 is placed on the reinforcing bar 100. Therefore, the first plate portion 21 extends horizontally, while the second plate portion 22 extends so as to protrude upward from the end of the first plate portion 21 on the partition plate 10 side. A through hole 22a is formed in the second plate portion 22, but this through hole 22a may be formed as needed or may be omitted.

[0034] (Configuration of fixing bracket 30) As shown in FIGS. 2 to 4, the fixing bracket 30 includes a first clamping member 31 and a second clamping member 32 that clamp the reinforcing bar 100 in the radial direction, a bolt 33, and a nut 34 (fastening members). The first clamping member 31 and the second clamping member 32 are made of metal plates. The first clamping member 31 is disposed on the upper side, and the second clamping member 32 is disposed on the lower side. The first clamping member 31 is formed with a notch 31a into which the upper portion of the reinforcing bar 100 fits, and an abutment portion 31b that abuts against the upper surface of the first plate portion 21 of the support member 20. The second clamping member 32 is formed with a fitting portion 32a into which the lower portion of the reinforcing bar 100 fits.

[0035] The head 33a of the bolt 33 is disposed so as to protrude from the lower surface of the second clamping member 32. The shank 33b of the bolt 33 is inserted from below into a first bolt insertion hole 31c formed in the first clamping member 31 and a second bolt insertion hole 32c formed in the second clamping member 32. An upper portion of the shank 33b of the bolt 33 protrudes upward from the upper surface of the first clamping member 31, and a nut 34 is threadedly engaged with the upper portion of the shank 33b. By tightening the nut 34, the first clamping member 31 and the second clamping member 32 are fastened in a direction in which they approach each other.

[0036] 4, when the reinforcing bar 100 is placed between the notch 31a of the first clamping member 31 and the fitting portion 32a of the second clamping member 32 and the abutting portion 31b of the first clamping member 31 is abutted against the upper surface of the first plate portion 21 of the support member 20, the nut 34 is tightened, whereby the reinforcing bar 100 and the support member 20 are clamped together by the first clamping member 31 and the second clamping member 32. This allows the support member 20 to be fixed at a desired position relative to the reinforcing bar 100.

[0037] The structure of the fixing bracket 30 described above is one example, and any structure may be used as long as it can fix the support member 20 at a desired position relative to the reinforcing bar 100. Although not shown, instead of or in addition to the fixing bracket 30, the support member 20 may be fixed to the reinforcing bar 100 using a wire such as a binding wire (gauge wire).

[0038] (Configuration of connector 40) As shown in Fig. 1, the connector 40 is used to connect the partition plate 10 to the support member 20, and in this embodiment, it comprises a first member 41 and a second member 42. In Fig. 1, multiple connectors 40 connect multiple locations of the partition plate 10 to the support member 20, and in this case, the pitch between adjacent connectors 40 can be set to, for example, about 60 cm. The number of connectors 40 to be used may be determined depending on the length of the partition plate 10.

[0039] The first member 41 and the second member 42 are made of metal plates. The first member 41 has an arm portion 41a and a partition plate fitting portion 41b integrally molded at the base end of the arm portion 41a. The arm portion 41a extends approximately horizontally. The partition plate fitting portion 41b is formed so that the upper portion of the partition plate 10 can be inserted therein. As shown in FIG. 5, the partition plate fitting portion 41b has a base end vertical plate portion 41c extending upward from the base end of the arm portion 41a, an upper plate portion 41d extending horizontally from the upper end of the base end vertical plate portion 41c, and a tip end vertical plate portion 41e extending downward from the tip of the upper plate portion 41d. The length of the tip end vertical plate portion 41e is set shorter than the length of the base end vertical plate portion 41c, and the lower end of the tip end vertical plate portion 41e is located above the lower end of the base end vertical plate portion 41c. The space between the base-end vertical plate portion 41c and the tip-end vertical plate portion 41e is open downward and on both sides, which allows the upper portion of the partition plate 10 to be inserted between the base-end vertical plate portion 41c and the tip-end vertical plate portion 41e from below. The inserted upper portion of the partition plate 10 is sandwiched in the thickness direction between the base-end vertical plate portion 41c and the tip-end vertical plate portion 41e, and the partition plate fitting portion 41b fits into the upper portion of the partition plate 10. This prevents the connector 40 from moving relatively in the thickness direction of the partition plate 10. It can also be said that a fitting groove 41f into which the upper portion of the partition plate 10 fits is formed between the base-end vertical plate portion 41c and the tip-end vertical plate portion 41e.

[0040] As shown in FIG. 5, the second member 42 includes a fixed plate 42a fixed to the arm 41a and a pair of side plates 42b extending downward from both sides of the fixed plate 42a. The fixed plate 42a and the side plates 42b are integrally molded. As shown in FIGS. 6 and 7, the fixed plate 42a is placed on the upper surface of the arm 41a and fixed to the arm 41a by welding, for example. When the distance between the support member 20 and the partition plate 10 is long, the second member 42 can be fixed at a position far away from the base end of the arm 41a as shown in FIG. 6. When the distance between the support member 20 and the partition plate 10 is short, the second member 42 can be fixed to the middle of the arm 41a as shown in FIG. 7. The fixed position of the second member 42 relative to the arm 41a can be set according to the site.

[0041] Each side plate 42b is provided with an angle engaging portion 42c. The angle engaging portion 42c is slit-shaped and opens downward from the side plate 42b, extending upward. When the second plate 22 of the support member 20 is inserted into the angle engaging portion 42c from below, the angle engaging portions 42c engage with both sides of the second plate 22 in the thickness direction. This prevents the connector 40 from moving relatively in the thickness direction of the second plate 22.

[0042] (Slab joint surface smoothing method) Next, a method for smoothing a slab joint surface will be described using the slab joint surface smoothing tool 1 configured as described above. The slab joint surface smoothing method is a method for smoothing the concrete joint surface when finishing the entire slab by sequentially pouring concrete into multiple partitioned areas.

[0043] First, as shown in Fig. 8, the position that will become the concrete joint surface, i.e., the virtual joint surface 110, is identified. The virtual joint surface 110 can be identified based on a design drawing or the like, and specifically, the virtual joint surface 110 is identified by marking out. After identifying the virtual joint surface 110, the support member 20 is fixed to the reinforcing bar 100 at a position that is a predetermined distance horizontally outside the region R from the position that will become the joint surface. At this time, multiple fixing brackets 30 can be used as shown in Fig. 9, but a single fixing bracket 30 may also be used.

[0044] 3 and 4, the support member 20 is installed so that it extends in the same direction as the joint surface and so that the first plate portion 21 is placed on the reinforcing bar 100. Thereafter, the first clamping member 31 and the second clamping member 32, which clamp the reinforcing bar 100 radially, are fastened together with bolts 33 and nuts 34 in a direction that brings them closer to each other, thereby clamping the reinforcing bar 100 and the first plate portion 21 of the support member 20 together with the first clamping member 31 and the second clamping member 32. When tightening the nuts 34, an impact driver D as shown in FIG. 9 can be used.

[0045] 10, a partition plate 10 for partitioning the region R is placed at a position that will become the joint surface, and is connected to the support member 20 by a plurality of connectors 40. That is, the second plate portion 22 of the support member 20 is inserted into and engaged with the angle engagement portion 42c of the connector 40, and the upper portion of the partition plate 10 is inserted into and engaged with the partition plate fitting portion 41b of the connector 40, thereby connecting the partition plate 10 to the support member 20. At this time, a hammer H may be used to strike the connector 40 from above.

[0046] Next, as shown in FIG. 11, a plurality of vertically elongated jigs 500 for stopping the flow of concrete are inserted from above between the partition plate 10 and the second plate portion 22 of the support member 20 and fixed in place. The jigs 500 are lined up along the partition plate 10 and are tightly fitted together so that there are no gaps between adjacent jigs 500. The jigs 500 extend all the way to the bottom end of the region R. The jigs 500 may be structured, for example, such that a sponge containing a core material is housed in a resin bag, or may be structured so that they expand when air is injected and become vertically elongated.

[0047] After placing the jig 500, concrete is poured into the region R. When the concrete is poured, the flow pressure of the concrete acts on the partition plate 10, but since the support members 20 that support the partition plate 10 are fixed at a position a predetermined distance horizontally from the position that will become the joint surface, the fixed positions of the support members 20 to the reinforcing bars 100 are separated from the partition plate 10, and the support members 20 function like legs for the partition plate 10. This stabilizes the partition plate 10, making it less likely to shift from its fixed position or to fall over due to the flow pressure of the concrete.

[0048] After the poured concrete has hardened, the connectors 40 are removed and the partition plate 10 is removed. Because the partition plate 10 is thinner than when conventional square timber is used, steps are less likely to be created when the partition plate 10 is removed after the concrete has been poured, and cracks are less likely to occur in the completed slab.

[0049] Furthermore, the partition plate 10 has a flat surface that comes into contact with the concrete and does not deform due to the flow pressure of the concrete, so after pouring the concrete, a smooth joint surface can be obtained simply by removing the partition plate 10. This eliminates the need to scrape the cover to make it smooth, which contributes greatly to reducing the amount of work required, especially at large-scale construction sites.

[0050] Although not shown, a mesh-like member or a comb-like member may be installed as a jig to stop the flow of concrete.

[0051] (Modification of the first embodiment) 12 and 13 show a first modification of the first embodiment of the present invention. A connector 40A of this first modification is an integrally molded product and is composed of a single part. That is, the connector 40A includes an arm portion 43, an angle engaging portion 44 provided at the tip end of the arm portion 43, and a partition plate fitting portion 45 provided at the base end of the arm portion 43, and the arm portion 43, the angle engaging portion 44, and the partition plate fitting portion 45 are molded from a single metal plate.

[0052] The angle engagement portion 44 has a first contact plate portion 44a that contacts one side surface of the second plate portion 22 of the support member 20, and a pair of second contact plate portions 44b that contact the other side surface of the second plate portion 22. By inserting the second plate portion 22 between the first contact plate portion 44a and the second contact plate portion 44b from below, the second plate portion 22 is sandwiched between the first contact plate portion 44a and the second contact plate portion 44b in the thickness direction.

[0053] The partition plate fitting portion 45 has a similar configuration to the above-described partition plate fitting portion 41b, and includes a base-side vertical plate portion 45a, an upper plate portion 45b, and a tip-side vertical plate portion 45c. The upper portion of the partition plate 10 can be inserted between the base-side vertical plate portion 45a and the tip-side vertical plate portion 45c from below.

[0054] 14 and 15 show a second modification of the first embodiment of the present invention. A connector 40B of this second modification is capable of connecting the partition plate 10 to the support member 20 by a fastening structure. That is, the connector 40B includes a bolt 46 and a bracket 47. The bracket 47 has a vertical plate portion 47a extending along the side surface of the partition plate 10 and an end plate portion 47b extending from the lower end of the vertical plate portion 47a to the underside of the partition plate 10. As shown in FIG. 15, a screw insertion hole 47c through which a screw B is inserted is formed in the vertical plate portion 47a. As shown in FIG. 14, the connector 40B can be connected to the partition plate 10 by inserting a screw B into the screw insertion hole 47c and screwing it into the partition plate 10.

[0055] Meanwhile, head 46a of bolt 46 is fixed to vertical plate portion 47a of bracket 47. Two nuts 46c can be threaded onto shaft portion 46b of bolt 46. With shaft portion 46b of bolt 46 inserted into through-hole 22a of second plate portion 22 of support member 20, bolt 46 can be connected to support member 20 by tightening second plate portion 22 in the thickness direction with two nuts 46c.

[0056] 16 and 17 show a third modification of the first embodiment of the present invention. A connector 40C of this third modification is capable of connecting the partition plate 10 to the support member 20 by a fastening structure. That is, the connector 40C includes a bolt 48 and a bracket 49. As shown in FIG. 17, the bracket 49 has a bolt fixing portion 49a to which a head 48a of the bolt 48 is fixed. On both sides of the bolt fixing portion 49a in the bracket 49, screw insertion holes 49b through which a screw B is inserted are formed. As shown in FIG. 16, the connector 40C can be connected to the partition plate 10 by inserting a screw B into the screw insertion hole 49b and screwing it into the partition plate 10.

[0057] Meanwhile, two nuts 48c can be threaded onto the shaft portion 48b of the bolt 48. With the shaft portion 48b of the bolt 48 inserted into the through-hole 22a of the second plate portion 22 of the support member 20, the bolt 48 can be connected to the support member 20 by tightening the second plate portion 22 in the thickness direction with the two nuts 48c.

[0058] 18 shows a fourth modification of the first embodiment of the present invention. In this fourth modification, the partition plate 10A is made of a steel plate, and the connector 40D is made of a threaded rod and has two nuts N that screw onto the threaded rod. One end of the connector 40D is screwed into a screw hole 10B formed in the partition plate 10A. Note that one end of the connector 40D may be welded to the partition plate 10A.

[0059] The other end of the connector 40D can be inserted into the through hole 22a of the second plate portion 22 of the support member 20, and the second plate portion 22 can be tightened in the thickness direction with two nuts N to connect the connector 40D to the support member 20.

[0060] (Embodiment 2) 19 to 22 show a slab joint surface smoothing tool 1A according to a second embodiment of the present invention. This second embodiment differs from the first embodiment in that a partition plate 10C is supported by a leg member 50. Explanations of the same parts as in the first embodiment will be omitted, and only the parts that differ from the first embodiment will be explained in detail.

[0061] That is, the slab joint surface smoothing device 1A according to the second embodiment includes a partition plate 10C that is arranged on a reinforcing bar 100 so as to extend horizontally and vertically and that defines an area R where concrete is poured, and a leg member 50 that protrudes from the partition plate 10C outside the area R, is fixed to the reinforcing bar 100, and supports the partition plate 10C. The partition plate 10C is made of a metal plate material, such as a steel plate. The leg member 50 is formed by molding a metal round bar material and has a first rod-shaped portion 50a that extends horizontally and a second rod-shaped portion 50b that extends upward from one end of the first rod-shaped portion 50a. The second rod-shaped portion 50b, which is the base end of the leg member 50, is fixed to the side of the partition plate 10C by welding or the like.

[0062] The slab joint surface smoothing device 1A also includes a connecting member 60 that connects the leg members 50 together. The connecting member 60 is disposed below the first rod-shaped portion 50a of the leg member 50 as shown in Fig. 20, and extends in a direction perpendicular to the first rod-shaped portion 50a as shown in Fig. 21. The overlapping portions of the connecting member 60 and the first rod-shaped portion 50a are welded together.

[0063] As shown in Fig. 22, the slab joint surface smoothing device 1A is placed on the reinforcing bar 100. In this state, the first rod-shaped portion 50a of the leg member 50 becomes the portion that protrudes outside the region R. The first rod-shaped portion 50a is a fixed portion that is fixed to the reinforcing bar 100 by a binding wire E (shown in Fig. 19). The connecting material 60 is also a portion that is fixed to the reinforcing bar 100 by the binding wire E.

[0064] Next, a method for smoothing a slab joint surface using the slab joint surface smoothing tool 1A according to the second embodiment will be described. First, the position of the concrete joint surface, i.e., the imaginary joint surface 110, is identified. Then, the partition plate 10C is positioned so that it coincides with the imaginary joint surface 110, and the first rod-shaped portion 50a is bound to the reinforcing bar 100 with the binding wire E, and the connecting member 60 is also fixed to the reinforcing bar 100. This allows the partition plate 10C to be firmly fixed in place.

[0065] In the case of the second embodiment, as in the first embodiment, the work of smoothing the joint surface after pouring the concrete can be omitted, reducing the number of work steps, and a slab of good quality can be obtained.

[0066] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0067] As described above, the slab joint surface smoothing method and slab joint surface smoothing tool according to the present disclosure can be used when smoothing the joint surface of concrete. [Explanation of symbols]

[0068] 1. Slab joint surface smoothing equipment 10 Partition board 20 Support member 21 1st plate part 22 2nd plate part 30 Fixing bracket 31 First clamping member 32 second clamping member 33 volts 34 Nut 40 Connector 41b Partition plate fitting portion 42c Angle engagement part 100 rebar E Binding wire

Claims

1. A slab joint surface smoothing tool for smoothing the concrete joint surface when arranging concrete joint materials to form a concrete joint surface, A partition plate is arranged on the reinforcing bar so as to extend in the arrangement direction of the concrete joint material and partitions an area where concrete is poured; A support member fixed to the reinforcing bar at a position horizontally away from the position that becomes the joint surface by a predetermined distance outside the area; A slab joint surface smoothing tool comprising a connecting member that connects the partition plate and the support member.

2. The slab joint surface smoothing tool according to claim 1, A slab joint surface smoothing tool having a clamping member for fixing the support member to the reinforcing bar.

3. The slab joint surface smoothing tool according to claim 2, The clamping member is a slab joint surface smoothing device in which the first clamping member and the second clamping member, which clamp the reinforcing bar radially, are fastened in a direction approaching each other with a fastening member, thereby clamping the reinforcing bar and the support member together with the first clamping member and the second clamping member.

4. The slab joint surface smoothing tool according to claim 1, The support member is an angle member having a first plate portion and a second plate portion that are integrated so as to form a right angle with each other, and is a slab joint surface smoothing device.

5. The slab joint surface smoothing tool according to claim 4, The connecting member is provided with an angle engagement portion for engaging the second plate portion, and a partition plate fitting portion for fitting the partition plate, a slab joint surface smoothing tool.

6. A slab joint surface smoothing tool for smoothing the concrete joint surface when arranging concrete joint materials to form a concrete joint surface, A partition plate is arranged on the reinforcing bar so as to extend in the arrangement direction of the concrete joint material and partitions an area where concrete is poured; A slab joint surface smoothing device comprising: a leg member that protrudes from the partition plate outside the area and is fixed to the reinforcing bar to support the partition plate.

7. The slab joint surface smoothing tool according to claim 7, The partition plate and the leg member are made of metal, The base end of the leg member is connected to the partition plate, The portion of the leg member that protrudes outside the area is a fixed portion that is fixed to the reinforcing bar by a binding wire, and is a slab joint surface smoothing device.

8. A slab joint surface smoothing method for smoothing a concrete joint surface when arranging concrete joint materials to form a concrete joint surface using a slab joint surface smoothing tool, the method using the slab joint surface smoothing tool described in claim 1 or claim 6.

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