Installation structure of flow-straightening wall, manufacturing method of flow-straightening wall, and installation method of flow-straightening wall

Abstract

To provide an installation structure of a flow-straightening wall, a manufacturing method of the flow-straightening wall, and an installation method of the flow-straightening wall, each capable of improving workability while suppressing an increase in cost.SOLUTION: An installation structure 100 of a flow-straightening wall is configured to install, in a water channel S1 of a water purification facility S, a flow-straightening wall 1 having through-holes 3c through which water passes to straighten a water flow. The installation structure 100 of the flow-straightening wall comprises: a plurality of flow-straightening wall bodies 3 extending so as to connect a pair of side walls 2 of the water channel S1; and joints 10 joining the flow-straightening wall bodies 3 and the side walls 2. Each joint 10 comprises: a first loop reinforcement 11 protruding from an end surface 3d of the flow-straightening wall body 3; a second loop reinforcement 12 protruding from the side wall 2; and an infill material 13 placed with the first loop reinforcement 11 and the second loop reinforcement 12 embedded therein.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flow straightening wall installation structure, a flow straightening wall manufacturing method, and a flow straightening wall installation method. [Background technology]

[0002] Patent Document 1 describes a water treatment sedimentation tank equipped with a flow-regulating wall constructed by stacking a plurality of precast horizontal members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-051610 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, a support and a corner stop are installed near the inlet of the sedimentation tank, and the flow straightening wall is inserted and supported in the grooves on both sides of the support and the grooves in the corner stop. With this structure, depending on the object for which the groove is to be installed, it may be difficult to ensure a sufficient insertion depth (depth of the groove), such as in the waterways of a water purification facility where the thickness of the side wall is limited. Furthermore, if the side wall is made of reinforced concrete, it may be necessary to install joints or the like in the reinforcing bars of the side wall with the recess, which can be difficult to install. As such, there is room for improvement in the ease of installation of the flow straightening wall.

[0005] Alternatively, instead of providing a groove in the side wall, a pair of steel sections such as angle irons may be attached to the side wall, and the flow control wall may be placed between the pair of steel sections. While this avoids the above-mentioned problems associated with providing a groove in the side wall, corrosion-resistant steel sections such as stainless steel may be required to prevent corrosion of steel materials used in water purification facilities, which may increase costs.

[0006] An object of the present invention is to provide a flow-regulating wall installation structure, a flow-regulating wall manufacturing method, and a flow-regulating wall installation method that can improve workability while suppressing increases in costs. [Means for solving the problem]

[0007] (1) One aspect of the present invention is a straightening wall installation structure in which a straightening wall having through holes through which water passes to straighten the water flow is installed in a waterway of a water purification facility, and the structure comprises a plurality of straightening wall bodies extending to connect a pair of side walls of the waterway, and joints joining the straightening wall bodies to the side walls, and the joints have first loop reinforcing bars protruding from the side end portions of the straightening wall bodies, second loop reinforcing bars protruding from the side walls, and filler material poured to embed the first loop reinforcing bars and second loop reinforcing bars.

[0008] In a flow rectifying wall installation structure according to one aspect of the present invention, a plurality of flow rectifying wall bodies extend to connect a pair of side walls of a waterway, and the plurality of flow rectifying wall bodies and the side walls are joined at joints to install the flow rectifying wall. Filling material is poured into the joints to embed the first loop reinforcing bars and the second loop reinforcing bars. The first loop reinforcing bars and the second loop reinforcing bars, which have been previously protruding from the side ends of the flow rectifying wall bodies and the side walls, respectively, are filled with filler and solidified, thereby assembling the joints. This structure eliminates the need for groove processing in the side walls and the need for expensive fixing members such as joints to connect the reinforcing bars. Furthermore, because the joints can absorb installation errors in the flow rectifying wall bodies, for example, high-precision installation of the flow rectifying wall bodies is not required, thereby suppressing degradation of workability. Therefore, the flow rectifying wall installation structure according to one aspect of the present invention can improve workability while suppressing increases in costs.

[0009] (2) In the above (1), the first loop reinforcing bars and the second loop reinforcing bars may form a virtual loop surface extending along a vertical plane. In this case, by moving the flow straightening wall main body along the vertical plane and stacking them sequentially, it is possible to install multiple flow straightening wall main bodies while suppressing interference between the first loop reinforcing bars and the second loop reinforcing bars. Furthermore, in the event of horizontal shaking, the first loop reinforcing bars and the second loop reinforcing bars interfere with each other, thereby reducing the risk of the flow straightening wall main body falling during installation without using additional temporary materials.

[0010] (3) In the above (1), the first loop reinforcing bars and the second loop reinforcing bars may form a virtual loop surface extending along a horizontal plane. In this case, by moving the flow straightening wall main bodies along the horizontal plane and stacking them sequentially, it is possible to install multiple flow straightening wall main bodies while suppressing interference between the first loop reinforcing bars and the second loop reinforcing bars.

[0011] (4) In any one of the above (1) to (3), the first loop reinforcing bars and the second loop reinforcing bars may form an imaginary loop plane, and adjacent first loop reinforcing bars and second loop reinforcing bars may overlap each other at the joint when viewed from the normal direction of the loop plane. In this case, the flow straightening wall main body can be easily installed while the first loop reinforcing bars and the second loop reinforcing bars are staggered.

[0012] (5) In any one of the above (1) to (4), the first and second loop reinforcing bars form a virtual loop plane, and adjacent first and second loop reinforcing bars do not overlap each other at the joint when viewed from the normal direction of the loop plane, and the joint may have a third loop reinforcing bar that overlaps both adjacent first and second loop reinforcing bars when viewed from the normal direction of the loop plane. In this case, for example, the first and second loop reinforcing bars can be arranged on approximately the same plane, which can suppress a decrease in the cover thickness of the filler material in the first or second loop reinforcing bar closest to the surface of the joint compared to when the first and second loop reinforcing bars are arranged offset on different planes.

[0013] (6) In any one of the above (1) to (5), the first loop reinforcing bars and the second loop reinforcing bars may form a virtual loop surface, and the joint may have a reinforcing material arranged inside the first loop reinforcing bars and the second loop reinforcing bars so as to intersect with the loop surface. In this case, the reinforcing material suppresses bond splitting of the concrete around the reinforcing bars, thereby reducing the embedment length of the first loop reinforcing bars and the filler material.

[0014] (7) Another aspect of the present invention is a method for manufacturing a straightening wall that is to be installed in a water channel of a water purification facility and that has through holes through which water passes to straighten the water flow, the method comprising the steps of manufacturing a plurality of straightening wall bodies that extend to connect a pair of side walls of the water channel and that constitute the straightening wall by having their side ends joined to each of the pair of side walls by joints, the step of manufacturing the straightening wall bodies including the steps of placing a formwork that defines the outer shape of the straightening wall body, placing first loop reinforcing bars in the parts of the outer shape that will become the side ends, and pouring concrete into the formwork so that the first loop reinforcing bars protrude from the side ends, and in the step of placing the first loop reinforcing bars, welded closed type reinforcing bars are used as the first loop reinforcing bars.

[0015] In a method for manufacturing a rectifying wall according to another aspect of the present invention, a welded-closed reinforcing bar is used as the first loop reinforcing bar. Because a welded-closed reinforcing bar is manufactured by being processed into a loop shape with high precision in advance in a factory or the like, when manufacturing the rectifying wall main body near the installation site of the rectifying wall, for example, the first loop reinforcing bar delivered from the factory can be directly arranged, eliminating the need for cumbersome on-site processing that may reduce processing accuracy. Therefore, the method for manufacturing a rectifying wall according to another aspect of the present invention can contribute to improving productivity and assembly accuracy when installing a rectifying wall, which can improve workability while suppressing increases in costs.

[0016] (8) Yet another aspect of the present invention is a method for installing a straightening wall, which has through holes through which water passes to straighten the water flow, in a waterway of a water purification facility, the method comprising: an arrangement step of extending a plurality of straightening wall bodies so as to connect a pair of side walls of the waterway; and a joining step of joining the side ends of the straightening wall bodies to the pair of side walls, wherein in the arrangement step, the straightening wall body is arranged with a first loop reinforcing bar protruding from the side end of the straightening wall body and a second loop reinforcing bar protruding from the side wall; and in the joining step, the first loop reinforcing bar protruding from the side end of the straightening wall body and the second loop reinforcing bar protruding from the side wall, and filler material for embedding the first loop reinforcing bar and the second loop reinforcing bar is poured, and the pouring of the filler material is carried out in stages multiple times, targeting some of the plurality of straightening wall bodies.

[0017] In a method for installing a rectifying wall according to yet another aspect of the present invention, the filling material is poured in stages, targeting a portion of a plurality of rectifying wall bodies. For example, the filling material is poured after stacking one to several layers of rectifying wall bodies, and then the filling material is poured after stacking more rectifying wall bodies, and this process is repeated multiple times. This installation method can reduce the lateral pressure acting on the formwork due to the unhardened filling material during a single pour, compared to when the filling material is poured after stacking all layers of rectifying wall bodies. Therefore, the installation method for a rectifying wall according to yet another aspect of the present invention can reduce the burden on the formwork per pour of filling material when installing a rectifying wall, which can improve workability while suppressing increases in cost. [Effects of the Invention]

[0018] According to the present invention, it is possible to improve workability while suppressing increases in costs. [Brief explanation of the drawings]

[0019] [Figure 1] 1(a) is a front view showing the installation structure of the flow control wall according to the embodiment, and FIG. 1(b) is an enlarged view of a part of FIG. [Figure 2]2(a) is a front view showing an example of an arrangement step of the installation method of the flow rectifying wall according to the embodiment, and FIG. 2(b) is a front view showing an example of a plurality of flow rectifying wall main bodies arranged by the arrangement step of FIG. [Figure 3] FIG. 3 is a perspective view showing the arrangement step of FIG. 2(a) from another viewpoint. [Figure 4] 1(a) is a front view showing an example of a joining step in the method for installing a flow rectifying wall according to the embodiment, and FIG. 1(b) is a front view showing a joining step in the method for installing a flow rectifying wall according to a modified example. [Figure 5] 5(a) is a front view showing a modified example of the installation structure of the flow straightening wall, and FIG. 5(b) is a perspective view showing a part of the installation structure of the flow straightening wall of FIG. 5(a) from a different viewpoint to explain the arrangement process. [Figure 6] FIG. 6 is a perspective view of the flow straightening wall of FIG. 5(a) seen from a different viewpoint, for explaining a method of installing the flow straightening wall according to a modified example. [Figure 7] 7(a) is a front view showing an example of the arrangement of reinforcing bars in the installation structure of the flow control wall of FIG. 1(b), and FIG. 7(b) is a plan view showing an example of the arrangement of reinforcing bars of FIG. [Figure 8] 8(a) is a front view showing an example of the arrangement of reinforcing bars in the installation structure of the flow straightening wall of Fig. 5(a), and Fig. 8(b) is a plan view showing an example of the arrangement of reinforcing bars of Fig. 8(a). [Figure 9] 9(a) is a front view showing a modified example of the first loop reinforcing bars and the second loop reinforcing bars, (b) is a front view showing another modified example of the first loop reinforcing bars and the second loop reinforcing bars, and (c) is a plan view showing the first loop reinforcing bars and the second loop reinforcing bars of FIG. 9(b). [Figure 10] 1A is a plan view showing a modified formwork used in pouring filler material in the joining process, and FIG. 1B is a plan view showing another modified formwork used in pouring filler material in the joining process. [Figure 11] FIG. 10 is a front view showing the installation structure of a flow straightening wall according to a modified example in which the protrusion amounts of the first loop reinforcing bars and the second loop reinforcing bars are different. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially simplified or drawn in a schematic manner to facilitate understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0021] Fig. 1(a) is a front view showing an installation structure for a straightening wall according to an embodiment. As shown in Fig. 1(a), the installation structure 100 for a straightening wall is a structure for installing a straightening wall 1 in a water channel S1 of a water purification facility S. The water purification facility S is a facility that purifies water W, which is water to be treated, by, for example, filtration. The water purification facility S is equipped with a water channel S1. The water channel S1 is a passage for the water W defined by being sandwiched between a pair of side walls 2, and the water W is stored therein. The water channel S1 may be a settling tank.

[0022] The flow straightening wall 1 is installed between a pair of side walls 2 underwater in the water channel S1 of the water purification facility S. The flow straightening wall 1 is installed to straighten the flow of the water W in the water channel S1. The flow straightening wall 1 is installed inside (underwater in) the water W in the water channel S1 so as to intersect with the direction of the flow of the water W. The flow straightening wall 1 temporarily blocks and controls the flow of the water W, thereby straightening out turbulent flows and stabilizing the flow of the water W.

[0023] In this embodiment, the flow straightening wall 1 extends along both a first direction D1 and a second direction D2 intersecting the first direction D1. The flow straightening wall 1 has a thickness in a third direction D3 intersecting both the first direction D1 and the second direction D2. For example, the first direction D1 is vertically upward, and the second direction D2 is the direction in which the pair of side walls 2 face each other. The third direction D3 is the direction in which the water W flows between the pair of side walls 2. For example, the pair of side walls 2 have surfaces 2a that come into contact with the water W as vertical surfaces extending along the first direction D1 and the third direction D3.

[0024] In the installation structure 100 for a rectifying wall, the rectifying wall 1 is divided into a plurality of rectifying wall bodies 3 from the viewpoint of ease of construction, such as transportation and temporary installation.

[0025] Figure 1(b) is an enlarged view of a portion of Figure 1(a). Figure 1(b) shows an enlarged view of the area Ib enclosed by the dashed line in Figure 1(a). In Figure 1(b), the hatching indicating the filler material 13 (described below) is conveniently illustrated as a cross section to make it easier to see the reinforcing bars inside (the same applies to Figures 4, 5, and 10).

[0026] 1(a) and 1(b), the installation structure 100 for a straightening wall includes a plurality of straightening wall bodies 3 extending to connect a pair of side walls 2 of a water channel S1. The plurality of straightening wall bodies 3 are stacked on top of each other and arranged along a first direction D1 so that their longitudinal direction is the second direction D2, which is the direction connecting the pair of side walls 2.

[0027] Each rectifying wall main body 3 has, for example, a rod or strip shape, and a cross section perpendicular to the longitudinal direction is rectangular. The upper surface 3a and the lower surface 3b of the rectifying wall main body 3 are smooth flat surfaces along both the second direction D2 and the third direction D3, and are formed so as not to create gaps when stacked on top of each other. The multiple rectifying wall main bodies 3 each have, for example, the same shape. The multiple rectifying wall main bodies 3 stacked on top of each other form a rectifying wall 1 that extends in both the first direction D1 and the second direction D2 and has a thickness in the third direction D3. The thickness in the third direction D3 can be, for example, about 200 mm to 300 mm.

[0028] The rectifying wall main body 3 is made of precast (PCa) concrete. As an example, the rectifying wall main body 3 may be manufactured in advance in a factory, and a plurality of manufactured rectifying wall main bodies 3 may be carried to the installation site of the rectifying wall 1.

[0029] The rectifying wall 1 has a plurality of through holes 3c through which water W passes to rectify the water flow. The through holes 3c are holes through which the water W passes through the rectifying wall 1. The plurality of through holes 3c are provided, for example, in the rectifying wall main body 3 at approximately equal intervals along the second direction D2, which is the longitudinal direction of the rectifying wall main body 3, and are formed so as to penetrate the rectifying wall main body 3 in the third direction D3. The plurality of through holes 3c are formed, for example, when the rectifying wall main body 3 is manufactured, by arranging a hollow tubular member and pouring concrete therein. The diameter of the through holes 3c can be, for example, about 100 mm.

[0030] The shape of the through holes 3c when viewed from the third direction D3 is, for example, circular. When multiple rectifying wall main bodies 3 are stacked on top of each other, the multiple through holes 3c may be arranged in a lattice pattern when viewed from the third direction D3. The shape of the through holes 3c may be a shape other than circular and is not particularly limited. The number of through holes 3c in the rectifying wall main body 3 and the arrangement of the through holes 3c are also not particularly limited.

[0031] The installation structure 100 for a straightening wall includes a joint 10 that joins the straightening wall main body 3 and the side wall 2. The joint 10 is a structure for joining the straightening wall main body 3 and the side wall 2. The joint 10 has a first loop reinforcing bar 11, a second loop reinforcing bar 12, and a filler material 13.

[0032] The first loop reinforcing bar 11 is a reinforcing bar that protrudes from the end face (side end) 3d of the flow straightening wall main body 3. The first loop reinforcing bar 11 has, for example, a pair of base end portions 11a that protrude from the end face 3d of the flow straightening wall main body 3, and a tip end portion 11b that connects the pair of base end portions 11a to each other.

[0033] The first loop reinforcing bar 11 has, for example, a U-shape. In this case, the pair of base ends 11a protrude from the end face 3d of the flow straightening wall main body 3 and extend linearly and substantially parallel to each other by a predetermined first length. The predetermined first length is set in advance so that the first loop reinforcing bar 11 and the second loop reinforcing bar 12 have a predetermined positional relationship. The tip end 11b is bent in a loop shape so as to describe a substantially semicircular arc.

[0034] The first loop reinforcing bar 11 may have a pair of straight portions 11c extending continuously from the pair of base ends 11a, on the inside of the end face 3d of the flow rectifying wall main body 3. The pair of straight portions 11c are provided inside the flow rectifying wall main body 3 so as to avoid the multiple through holes 3c and to have a predetermined covering thickness.

[0035] A plurality of shear reinforcement bars 11d are arranged at a predetermined interval in the pair of straight portions 11c so as to be approximately parallel to the direction in which the water W flows (third direction D3). Each of the plurality of shear reinforcement bars 11d may be arranged, for example, at a position midway between adjacent through holes 3c. In the first direction D1, the pair of shear reinforcement bars 11d are arranged inside the pair of straight portions 11c, for example, in consideration of ease of ensuring the covering thickness. The shear reinforcement bars 11d may also be arranged outside the pair of straight portions 11c in the first direction D1.

[0036] The second loop reinforcing bar 12 is a reinforcing bar that protrudes from the side wall 2. The second loop reinforcing bar 12 has, for example, a pair of base end portions 12a that protrude from the surface 2a of the side wall 2 and a tip end portion 12b that connects the pair of base end portions 12a to each other.

[0037] The second loop reinforcing bar 12 has, for example, a U-shape. In this case, a pair of base ends 12a protrude from the surface 2a of the side wall 2 and extend linearly and substantially parallel to each other for a predetermined second length. The tip end 12b is bent in a loop shape so as to describe a substantially semicircular arc. The radius of the tip end 12b may be approximately the same as the radius of the tip end 11b.

[0038] The predetermined second length, like the first length, is set in advance so that the first loop reinforcing bars 11 and the second loop reinforcing bars 12 have a predetermined positional relationship. The predetermined positional relationship refers to, for example, as shown in FIG. 1(b), when the flow straightening wall main body 3 is placed at a predetermined position relative to the side wall 2 and the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are placed at predetermined positions, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 intersect with each other to form a closed curve as viewed from the third direction D3. In this case, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are offset from each other in the third direction D3 (the depth direction of the page) so as not to interfere with each other (see FIG. 3). The first length and the second length may be set so that the tip end 11b and the tip end 12b pass each other in the second direction D2. The positional relationship in which the tip 11b and the tip 12b pass each other in the second direction D2 means a positional relationship in which the tip 11b is farther from the end face 3d of the straightening wall main body 3 than the tip 12b, and the tip 12b is farther from the surface 2a of the side wall 2 than the tip 11b.

[0039] The distance between the pair of base ends 12a may be approximately the same as the distance between the pair of base ends 11a, and in this case, is also approximately the same as the distance between the pair of straight portions 11c. Note that the distance between the pair of base ends 12a may be different from the distance between the pair of base ends 11a.

[0040] The second loop reinforcing bar 12 may have a pair of straight portions 12c extending continuously from the pair of base ends 12a, inside the surface 2a of the side wall 2. For example, when the side wall 2 is newly constructed, the pair of straight portions 12c may be embedded inside the side wall 2 in advance.

[0041] The first loop reinforcing bars 11 and the second loop reinforcing bars 12 may be epoxy resin-coated reinforcing bars. This prevents corrosion of the first loop reinforcing bars 11 and the second loop reinforcing bars 12 when they are immersed in water W in the waterway S1, and makes it easier to maintain durability at the interface between the filler material 13 and the side wall 2, or between the filler material 13 and the flow-rectifying wall main body 3.

[0042] The first loop reinforcing bar 11 and the second loop reinforcing bar 12 form imaginary loop surfaces L1 and L2, respectively. The imaginary loop surfaces L1 and L2 are imaginary planes that include the first loop reinforcing bar 11 and the second loop reinforcing bar 12. In other words, the first loop reinforcing bar 11 and the second loop reinforcing bar 12 are composed of curved reinforcing bars extending on the imaginary loop surfaces L1 and L2, respectively. As shown in FIG. 3, the imaginary loop surfaces L1 and L2 of the first loop reinforcing bar 11 and the second loop reinforcing bar 12 extend along vertical planes that extend in the first direction D1 and the third direction D3.

[0043] The filler 13 is a material that is poured into the joint 10 to embed the first loop reinforcing bars 11 and the second loop reinforcing bars 12. There are no particular limitations on the filler 13 as long as it is a cement-based material. For example, ready-mixed concrete, non-shrink mortar, steel fiber reinforced concrete (SFRC), ultra-high performance fiber reinforced cementitious composite (UHPFRC), etc. can be used as the filler 13.

[0044] Fig. 2(a) is a front view showing an example of an arrangement step of the installation method of the flow straightening wall according to the embodiment. Fig. 2(b) is a front view showing an example of a plurality of flow straightening wall main bodies arranged by the arrangement step of Fig. 2(a). Fig. 3 is a perspective view showing the arrangement step of Fig. 2(a) from a different viewpoint. The installation method of the flow straightening wall is a method of installing a flow straightening wall 1 having through holes 3c through which water passes to straighten the water flow, in a water channel S1 of a water purification facility S.

[0045] In the installation method for a straightening wall, the arrangement step involves extending a plurality of straightening wall bodies 3 so as to connect a pair of side walls 2 of a water channel S1. In the arrangement step, the straightening wall body 3 is arranged in a state in which the first loop reinforcing bars 11 protrude from the end face 3d of the straightening wall body 3 and the second loop reinforcing bars 12 protrude from the surface 2a of the side wall 2.

[0046] Here, since the virtual loop surface L2 of the second loop reinforcing bars 12 extends along a vertical plane, as shown in Fig. 2(a), the rectifying wall main body 3 is suspended so that the virtual loop surface L1 of the first loop reinforcing bars 11 extends along a vertical plane, and then the rectifying wall main body 3 is lowered from above to below in the first direction D1 to temporarily install the rectifying wall main body 3. At this time, as shown in Fig. 3, the pair of first loop reinforcing bars 11 are positioned more inward than the pair of second loop reinforcing bars 12 in the third direction D3, so that the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are offset from each other so as not to interfere with each other. In the second direction D2, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are offset from each other so as not to interfere with each other in the third direction D3. In addition, in order to prevent the first loop reinforcing bars 11 and the second loop reinforcing bars 12 from interfering with each other in the third direction D3, one first loop reinforcing bar 11 may be positioned inside a pair of second loop reinforcing bars 12, and the other first loop reinforcing bar 11 may be positioned outside a pair of second loop reinforcing bars 12, thereby creating an offset positional relationship (see Figure 10).

[0047] Here, for example, if horizontal shaking, such as during an earthquake, occurs while the concrete members are stacked, there is a risk that the concrete members may fall. Therefore, temporary materials may be installed separately to prevent the concrete members from falling. In the temporary structure shown in FIG. 3 , even if the flow rectifying wall main bodies 3 are stacked and the joining at the joints 10 is incomplete until the next step, the horizontal movement of the flow rectifying wall main bodies 3 is prevented by interference between the first loop reinforcing bars 11 and the second loop reinforcing bars 12. Therefore, the risk of the flow rectifying wall main bodies 3 tipping over and falling in the out-of-plane direction during installation can be reduced without using additional temporary materials for fall prevention. In the example shown in FIG. 3 , the pair of first loop reinforcing bars 11 is positioned inside the pair of second loop reinforcing bars 12 in the third direction D3. This makes it easier to prevent the horizontal movement of the flow rectifying wall main bodies 3 than when at least one of the first loop reinforcing bars 11 is positioned outside the pair of second loop reinforcing bars 12.

[0048] 2(b), the plurality of temporarily installed flow straightening wall bodies 3 are stacked one after another. At this time, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are positioned so that the tip ends 11b and 12b of the first loop reinforcing bars 11 and the second loop reinforcing bars 12 pass each other in the second direction D2. In other words, when viewed from the normal direction (third direction D3) of each imaginary loop surface L1, L2, the adjacent first loop reinforcing bars 11 and the second loop reinforcing bars 12 overlap each other at the joints 10.

[0049] 4(a) is a front view showing an example of a joining step in the installation method of a flow straightening wall according to the embodiment. In the installation method of a flow straightening wall, the joining step involves joining the end faces 3d of the flow straightening wall main body 3 to the pair of side walls 2. In the joining step, filler material 13 is poured to embed the first loop reinforcing bars 11 and the second loop reinforcing bars 12.

[0050] FIG. 4(a) shows an example in which the stacking of the flow rectifying wall bodies 3, the installation of formwork, and the filling of the filler material 13 are performed all at once for all of the multiple flow rectifying wall bodies 3 stacked up to the top layer. To install the formwork, a filler formwork (not shown) is installed at the joint 10 so as to surround the entire area where the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are adjacent. The formwork is installed, for example, by erecting boards so as to sandwich all of the multiple flow rectifying wall bodies 3 near the joint 10 from both sides in the third direction D3. The filler material 13 is filled into the space between the multiple flow rectifying wall bodies 3 and the side wall 2, which is partitioned by the formwork. After the filler material 13 is filled in during the joining process, the filler material 13 is allowed to harden before being removed from the formwork, and the flow rectifying wall 1 is constructed.

[0051] When pouring the filler material 13, pouring may be performed in stages multiple times, targeting only a portion of the multiple rectifying wall bodies 3. Instead of performing the steps of stacking the rectifying wall bodies 3, installing the formwork, and filling the filler material 13 all at once, the steps of stacking the rectifying wall bodies 3, installing the formwork, and filling the filler material 13 may be performed multiple times, with each cycle consisting of stacking the rectifying wall bodies 3, installing the formwork, and filling the filler material 13. FIG. 4(b) is a front view showing the joining step of a rectifying wall installation method according to a modified example. FIG. 4(b) shows an example of pouring the filler material for the lower two layers of the rectifying wall bodies 3, which can be installed in five layers in the figure. When installing the formwork in FIG. 4(b), a filler formwork (not shown) is installed at the joint 10 to surround the rectifying wall bodies 3 arranged as one cycle in the portion where the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are adjacent to each other. In the example of Figure 4(b), the height of the filled filler 13 is reduced compared to the example of Figure 4(a), and the lateral pressure acting on the formwork by the filler 13 before hardening is therefore reduced. This allows the formwork to be simplified.

[0052] In the example of Figure 4(b), the bottom two stages are filled with filler material 13 in the joining process, and then the filler material 13 is allowed to harden before being removed from the form. Subsequently, for the next cycle, the flow rectifying wall main bodies 3 are stacked, formwork is installed, and the filler material 13 is filled, and the form is allowed to harden before being removed from the form. By repeating such multiple cycles until the flow rectifying wall main body 3 of the top stage is joined, the flow rectifying wall 1 is constructed.

[0053] In the installation structure 100 for a rectifying wall according to the present embodiment as described above, multiple rectifying wall bodies 3 extend to connect a pair of side walls 2 of the water channel S1, and the multiple rectifying wall bodies 3 and the side walls 2 are joined at joints 10 to install the rectifying wall 1. At the joints 10, filler material 13 is poured to embed the first loop reinforcing bars 11 and the second loop reinforcing bars 12. The first loop reinforcing bars 11 and the second loop reinforcing bars 12, which have been previously protruding from the end face 3d of the rectifying wall body 3 and the side wall 2, respectively, are filled with filler material 13 and solidified, thereby assembling the joints 10. This structure eliminates the need for groove processing in the side walls 2 and the need for expensive anchors such as joints to connect the reinforcing bars. Furthermore, since the joints 10 can absorb construction errors in the installation of the rectifying wall body 3, for example, high-precision installation of the rectifying wall body 3 is not required, thereby suppressing degradation of workability. Therefore, according to the installation structure for a flow-regulating wall according to one aspect of the present invention, it is possible to improve workability while suppressing increases in costs.

[0054] For example, when constructing the rectifying wall 1 using cast-in-place concrete, in which formwork is directly assembled on a pair of side walls 2 at the installation site and concrete is poured into them, scaffolding and temporary construction work is required to create this relatively thin rectifying wall 1. Therefore, in terms of the amount of concrete poured, the costs of this scaffolding and temporary construction work tend to be higher than at sites larger than those for the rectifying wall 1. Furthermore, because the scaffolding and temporary construction must remain on-site until the rectifying wall 1 is completed, it is difficult to proceed with the main construction of the waterway S1. In addition to the above-mentioned effects of the joints 10, the rectifying wall installation structure 100 makes it possible to reduce both the overall construction cost of the rectifying wall 1 and the cost of constructing the joints 10 themselves.

[0055] In this embodiment, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 form imaginary loop surfaces L1, L2 that extend along a vertical plane. As a result, by moving the flow rectifying wall main bodies 3 along the vertical plane and stacking them sequentially, it is possible to install multiple flow rectifying wall main bodies 3 while suppressing interference between the first loop reinforcing bars 11 and the second loop reinforcing bars 12. Furthermore, because the first loop reinforcing bars 11 and the second loop reinforcing bars 12 interfere with each other in the event of horizontal shaking, it is possible to reduce the risk of the flow rectifying wall main body 3 falling during installation without using additional temporary materials.

[0056] In this embodiment, the first loop reinforcing bars 11 and the second loop reinforcing bars 12 form imaginary loop surfaces L1, L2, and when viewed from the normal direction of the loop surfaces L1, L2 (third direction D3), adjacent first loop reinforcing bars 11 and second loop reinforcing bars 12 overlap each other at the joints 10. This makes it possible to easily install the straightening wall main body 3 while ensuring that the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are staggered.

[0057] In the installation method of a rectifying wall as shown in the example of FIG. 4(b), the filling material 13 is poured in stages, targeting only a portion of the plurality of rectifying wall bodies 3. For example, the filling material 13 is poured after stacking one to several layers of rectifying wall bodies 3, and then the filling material 13 is poured after stacking more rectifying wall bodies 3, and this process is repeated multiple times. This installation method can reduce the lateral pressure acting on the formwork due to one cycle of unhardened filling material 13 during each pouring, compared to the case in which the rectifying wall bodies 3 are stacked in all layers before pouring the filling material 13, as shown in the example of FIG. 4(a). Therefore, this installation method of a rectifying wall can reduce the burden on the formwork per pouring of the filling material 13 when installing a rectifying wall 1, which can improve workability while suppressing increases in cost.

[0058] The present invention is not limited to the above-described embodiments and modifications, but can be modified within the scope of the gist described in the claims.

[0059] For example, the first loop reinforcing bar 11 and the second loop reinforcing bar 12 form imaginary loop surfaces L1, L2 extending along a vertical plane, but this is not limited to this example. The imaginary loop surfaces formed by the first loop reinforcing bar and the second loop reinforcing bar may extend along a horizontal plane, or may extend along a plane that intersects both a vertical plane and a horizontal plane.

[0060] Fig. 5(a) is a front view showing a modified installation structure 100A of a flow straightening wall. In the example of Fig. 5(a), at a joint 10A, a first loop reinforcing bar 11A and a second loop reinforcing bar 12A form imaginary loop surfaces L3 and L4 extending along a horizontal plane (see Fig. 5(b)).

[0061] The first loop reinforcing bar 11A has, for example, a U-shape similar to the first loop reinforcing bar 11, but the attachment positions of the pair of base ends 11a relative to the flow-rectifying wall main body 3A are different. For example, the attachment positions of the pair of base ends 11a may be changed so that the line segment connecting the base ends 11a rotates approximately 90° within the plane of the end face 3d.

[0062] The pair of straight portions 11c of the first loop reinforcing bar 11A may be located in the same horizontal plane as the first loop reinforcing bar 11A. For the first loop reinforcing bar 11A above the through holes 3c, a pair of straight portions 11c may be provided inside the flow rectifying wall main body 3A so that the first loop reinforcing bar 11A passes above the multiple through holes 3c and has a predetermined covering thickness. For the first loop reinforcing bar 11A below the through holes 3c, a pair of straight portions 11c may be provided inside the flow rectifying wall main body 3A so that the first loop reinforcing bar 11A passes below the multiple through holes 3c and has a predetermined covering thickness.

[0063] The second loop reinforcing bar 12A has, for example, a U-shape like the second loop reinforcing bar 12, but the attachment positions of the pair of base ends 12a relative to the side wall 2 are different. For example, the attachment positions of the pair of base ends 12a may be changed so that the line segment connecting the base ends 12a rotates approximately 90° within the plane of the surface 2a of the side wall 2. In the example of FIG. 5(a), one first loop reinforcing bar 11 is arranged inside the pair of second loop reinforcing bars 12 and the other first loop reinforcing bar 11 is arranged outside the pair of second loop reinforcing bars 12 in the first direction D1, so that the first loop reinforcing bars 11 and the second loop reinforcing bars 12 are offset from each other so as not to interfere with each other.

[0064] Fig. 5(b) is a perspective view of a part of the installation structure of the flow rectifying wall 1A in Fig. 5(a) viewed from a different viewpoint to explain the placement process. In the examples of Fig. 5(a) and Fig. 5(b), the imaginary loop surfaces L3 and L4 of the second loop reinforcing bars 12A extend along a horizontal plane. Therefore, if the flow rectifying wall main body 3A is lowered from above to below in the first direction D1 as in Fig. 3, the first loop reinforcing bars 11A will interfere with the second loop reinforcing bars 12A. Therefore, as shown in Fig. 6, the flow rectifying wall main body 3A is temporarily installed by sliding it in the third direction D3 along a horizontal plane.

[0065] In Figure 6, the straightening wall main body 3A, which is positioned on the front side of the page before sliding, is indicated by a two-dot chain line. As indicated by the two-dot chain arrow, the first loop reinforcing bars 11A and the second loop reinforcing bars 12A are shifted in the first direction D1 so as not to interfere with each other, and the straightening wall main body 3A is slid in the third direction D3 to temporarily install the uppermost straightening wall main body 3A. At this time, the first loop reinforcing bars 11A and the second loop reinforcing bars 12A are positioned so that their tip ends 11b and 12b pass each other in the second direction D2. In other words, when viewed from the normal direction (first direction D1) of each imaginary loop surface L3, L4, the adjacent first loop reinforcing bars 11A and second loop reinforcing bars 12A overlap each other at the joint 10A.

[0066] As shown in FIG. 5(a), the joint 10A may have a penetrating reinforcing bar (reinforcement) 14. The penetrating reinforcing bar 14 is a reinforcing bar arranged inside the first loop reinforcing bar 11A and the second loop reinforcing bar 12A so as to intersect with the loop surfaces L3 and L4. The penetrating reinforcing bar 14 is installed, for example, by inserting a straight reinforcing bar into the first loop reinforcing bar 11A and the second loop reinforcing bar 12A along the first direction D1. By penetrating the penetrating reinforcing bar 14 as a reinforcing bar inside the first loop reinforcing bar 11A and the second loop reinforcing bar 12A, the penetrating reinforcing bar 14 prevents bond splitting of the concrete in the filler material 13 around the first loop reinforcing bar 11A and the second loop reinforcing bar 12A. Therefore, the anchorage length of the first loop reinforcing bar 11A and the second loop reinforcing bar 12A can be shortened. The penetrating reinforcing bars 14 can be placed at once by inserting them inside the plurality of first loop reinforcing bars 11A and second loop reinforcing bars 12A, thereby reducing the burden of reinforcing bar arrangement work.

[0067] Incidentally, it is also possible to install penetrating rebars (reinforcements) in the joint 10 of Figure 1(b). In this case, instead of placing the penetrating rebars 14 all at once, shorter rebars are inserted one row at a time inside the first loop rebar 11 and the second loop rebar 12. Even in this case, the anchorage length of the first loop rebar 11 and the second loop rebar 12 can be shortened, but Figure 5(a) is more efficient in that the rebars can be placed all at once.

[0068] In the above embodiment and modified examples, the rectifying wall main bodies 3, 3A are made of precast (PCa) concrete and are manufactured in advance in a factory, and the manufactured multiple rectifying wall main bodies 3 are transported to the installation site of the rectifying wall 1, 1A. However, as another example, the rectifying wall main bodies 3, 3A may be manufactured near the installation site of the rectifying wall 1 (so-called site precasting). This site precasting, in the method of manufacturing a rectifying wall that manufactures the rectifying wall 1, 1A to be installed in the water channel S1 of the water purification facility S and having through holes 3c through which water passes to regulate the water flow, constitutes a step of manufacturing multiple rectifying wall main bodies 3, 3A that extend to connect a pair of side walls 2 of the water channel S1 and whose end faces 3d are joined to the pair of side walls 2 by joints 10, 10A, respectively, to form the rectifying wall 1, 1A.

[0069] The process of manufacturing the rectifying wall main body 3, 3A involves placing a formwork (not shown) that defines the outer shape of the rectifying wall main body 3, 3A. This formwork is used to form the outer shape of the rectifying wall main body 3, 3A by pouring concrete inside. A cylindrical member for forming the multiple through holes 3c may be placed inside this formwork.

[0070] In the process of manufacturing the rectifying wall main body 3, 3A, a process of arranging the first loop reinforcing bars 11, 11A in the part that will become the end face 3d of the outer shape of the rectifying wall main body 3, 3A is subsequently carried out. In the process of arranging the first loop reinforcing bars 11, 11A, a pair of base end portions 11a and tip end portions 11b are left protruding from the part of the formwork that corresponds to the end face 3d.

[0071] In the process of placing the first loop reinforcing bars 11, 11A, it is preferable to use welded closed reinforcing bars as the first loop reinforcing bars 11, 11A. Welded closed reinforcing bars refer to reinforcing bars that have been previously bent into an oval shape, butted together, and then welded at both ends to form a closed oval shape, and are processed in a separate welding factory or the like. By using welded closed reinforcing bars, in the process of placing the reinforcing bars 11, 11A, it is possible to place the reinforcing bars 11, 11A simply by placing the welded closed reinforcing bars delivered to the site precast in a closed loop shape into a formwork. In this case, the welded closed reinforcing bars are positioned so that they protrude from both end faces 3d of the flow rectifying wall main body 3, 3A. However, the use of welded closed reinforcing bars is not essential. The first loop reinforcing bars 11, 11A may also be obtained by bending rod-shaped reinforcing bars at the site precast where the flow rectifying wall main body 3, 3A is manufactured.

[0072] The process of manufacturing the rectifying wall main body 3, 3A subsequently involves a process of pouring concrete into a formwork so that the first loop reinforcing bars 11, 11A protrude from the end face 3d. In the process of pouring concrete, concrete is poured into the formwork while maintaining the pair of base end portions 11a and tip end portions 11b protruding from the portion of the formwork corresponding to the end face 3d in the process of arranging the first loop reinforcing bars 11, 11A described above. This results in the manufacture of the rectifying wall main body 3, 3A in which the first loop reinforcing bars 11, 11A protrude in a U-shape from the end face 3d (both end faces 3d of the rectifying wall main body 3, 3A) as in the above-described embodiment and modified example.

[0073] In this type of manufacturing method for a rectifying wall, welded-closed reinforcing bars are used as the first loop reinforcing bars 11, 11A. Welded-closed reinforcing bars are manufactured in advance in a factory or the like by being processed into a loop shape with high precision. Therefore, when manufacturing the rectifying wall main body 3, 3A by on-site precasting near the installation site of the rectifying wall, for example, the first loop reinforcing bars 11, 11A delivered from the factory can be arranged as is, eliminating the need for cumbersome on-site processing that may reduce processing accuracy. Therefore, the above-mentioned manufacturing method for a rectifying wall can contribute to improving productivity and assembly accuracy when installing the rectifying wall 1, 1A, which can improve workability while suppressing increases in costs.

[0074] In the above embodiment and modified example, in addition to the shear reinforcement 11d shown in Fig. 1(a), distribution reinforcement may be further arranged for the first loop reinforcement 11, 11A and the second loop reinforcement 12, 12A. Fig. 7(a) is a front view showing an example of the arrangement of reinforcement in the installation structure of the flow rectifying wall of Fig. 1(b). Fig. 7(b) is a plan view showing an example of the arrangement of reinforcement in Fig. 7(a). Fig. 8(a) is a front view showing an example of the arrangement of reinforcement in the installation structure of the flow rectifying wall of Fig. 5(a). Fig. 8(b) is a plan view showing an example of the arrangement of reinforcement in Fig. 8(a). The distribution reinforcement is a reinforcing bar arranged so as to intersect with the first loop reinforcement 11, 11A and the second loop reinforcement 12, 12A. The distribution reinforcement is approximately parallel to the flow direction of water W (third direction D3).

[0075] In the examples shown in Figures 7(a) and 7(b), the reinforcing bars 15 are arranged so as to contact the top or bottom of the first loop reinforcing bars 11 and the top or bottom of the second loop reinforcing bars 12, for example, in the first direction D1. In the examples shown in Figures 8(a) and 8(b), the reinforcing bars 15 are arranged so as to contact the top of the first loop reinforcing bars 11A and the top of the second loop reinforcing bars 12A, for example, in the first direction D1. The reinforcing bars 15 in Figures 8(a) and 8(b) may also be arranged so as to contact the bottom of the first loop reinforcing bars 11, 11A or the bottom of the second loop reinforcing bars 12, 12A. The reinforcing bars 15 strengthen the adhesion of the filler 13 around the first loop reinforcing bars 11, 11A and the second loop reinforcing bars 12, 12A. This reinforces the joints 10, 10A, making them less susceptible to deformation.

[0076] In the above embodiment and modified examples, the first loop reinforcing bars 11, 11A and the second loop reinforcing bars 12, 12A are U-shaped, but this is not limited to this example. Fig. 9(a) is a front view showing a modified example of the first loop reinforcing bars and the second loop reinforcing bars. As shown in Fig. 9(a), the first loop reinforcing bars 11B and the second loop reinforcing bars 12B may be rectangular. The first loop reinforcing bars and the second loop reinforcing bars may have various other shapes. Furthermore, they do not have to have the same shape.

[0077] 9(a), in the installation structure 100B of the flow straightening wall, the pair of base ends 11a and the pair of base ends 12a of the first loop reinforcing bars 11B and the second loop reinforcing bars 12B may not overlap when viewed from the normal direction of the imaginary loop surface (third direction D3). Here, "the pair of base ends 11a and the pair of base ends 12a do not overlap" means that the pair of base ends 11a and the pair of base ends 12a are provided at different positions along the end face 3d and the surface 2a of the side wall 2, respectively, of the flow straightening wall main body 3. In the case of this flow straightening wall 1B, when viewed from the normal direction of the imaginary loop surface (third direction D3), the area enclosed by the imaginary loop surface of the first loop reinforcing bars 11B and the imaginary loop surface of the second loop reinforcing bars 12B becomes large, and therefore the bearing area becomes large. In addition, the fixation with the filler material 13 is improved, and the fixation length of the first loop reinforcing bars 11B and the second loop reinforcing bars 12B can be reduced.

[0078] In the above embodiment and modified examples, the adjacent first loop reinforcing bars 11, 11A and second loop reinforcing bars 12, 12A overlap each other at the joints 10, 10A when viewed from the normal direction of each virtual loop surface, but this is not limited to these examples and they may not overlap each other at the joints 10, 10A. Figure 9(b) is a front view showing another modified example of the first loop reinforcing bars and second loop reinforcing bars. Figure 9(c) is a plan view showing the first loop reinforcing bars and second loop reinforcing bars of Figure 9(b).

[0079] 9(b) and 9(c), in the installation structure 100C for a rectifying wall, first loop reinforcing bars 11C protrude from the end face (side end) 3d of a rectifying wall main body 3C constituting the rectifying wall 1C, and second loop reinforcing bars 12C protrude from the surface 2a of the side wall 2. The first loop reinforcing bars 11C have a pair of base ends 11e extending a predetermined first length and a tip end 11f connecting the pair of base ends 11e. The second loop reinforcing bars 12C have a pair of base ends 12e extending a predetermined second length and a tip end 12f connecting the pair of base ends 12e.

[0080] In the examples of Figures 9(b) and 9(c), when multiple temporary straightening wall main bodies 3C are stacked sequentially, the first length and the second length may be set so that when the straightening wall main body 3C is placed at a predetermined position relative to the side wall 2 and the first loop reinforcing bar 11C and the second loop reinforcing bar 12C are placed at predetermined positions, the tip end 11f and the tip end 12f are butted against each other in the second direction D2.

[0081] The first loop reinforcing bar 11C and the second loop reinforcing bar 12C are positioned such that the tip 11b and the tip 12b of the first loop reinforcing bar 11C and the second loop reinforcing bar 12C are butted against each other in the second direction D2. That is, the first loop reinforcing bar 11C and the second loop reinforcing bar 12C form an imaginary loop surface, and when viewed from the normal direction of the imaginary loop surface (the third direction D3), the adjacent first loop reinforcing bar 11C and the adjacent second loop reinforcing bar 12C do not overlap with each other at the joint. Note that the imaginary loop surface of the first loop reinforcing bar 11C and the imaginary loop surface of the second loop reinforcing bar 12C may be substantially flush with each other.

[0082] The joint 10C may include a third loop reinforcing bar 16. The third loop reinforcing bar 16 is a reinforcing bar that overlaps both the first loop reinforcing bar 11C and the second loop reinforcing bar 12C that are adjacent in the second direction D2 when viewed from the normal direction (third direction D3) of the virtual loop surfaces of the first loop reinforcing bar 11C and the second loop reinforcing bar 12C. When viewed from the normal direction (third direction D3) of the virtual loop surfaces, the third loop reinforcing bar 16 intersects with the first loop reinforcing bar 11C and the second loop reinforcing bar 12C to form two closed curves, and may also be referred to as a double loop joint. The third loop reinforcing bar 16 may be arranged in the third direction D3 so as to contact along the surfaces of the first loop reinforcing bar 11C and the second loop reinforcing bar 12C that are farther (inner) from both the top surface 3e and the bottom surface 3f of the rectifying wall main body 3C. When the third loop reinforcing bar 16 is temporarily installed before the filling material 13 is poured, the third loop reinforcing bar 16 may be tied to the first loop reinforcing bar 11C and the second loop reinforcing bar 12C using a thin wire or the like.

[0083] As a result, even if the first loop reinforcing bars 11C and the second loop reinforcing bars 12C are butted against each other so that their virtual loop surfaces are substantially flush with each other, the third loop reinforcing bars 16 are arranged in a cross section where no reinforcing bars exist along the third direction D3, thereby improving the resistance to the force from the water W in the waterway S1. Furthermore, by arranging the third loop reinforcing bars 16 farther (inner) from both the top surface 3e and the bottom surface 3f of the flow straightening wall main body 3C in the third direction D3, it is easier to ensure the covering thickness of the filler material 13 up to the first loop reinforcing bars 11C and the second loop reinforcing bars 12C compared to, for example, a configuration in which the first loop reinforcing bars and the second loop reinforcing bars are arranged alternately.

[0084] In the above embodiment and modified example, an example has been given in which, as a formwork for pouring the filler material 13 between the plurality of rectifying wall main bodies 3 and the side wall 2, plates are erected so as to sandwich all of the plurality of rectifying wall main bodies 3 near the joints 10, 10A from both sides in the third direction D3, but this is not limiting. For example, the formwork may be provided on the rectifying wall main body 3 in advance.

[0085] FIG. 10(a) is a plan view showing a modified formwork used to cast the filler material in the joining process. In the rectifying wall installation structure 100D shown in FIG. 10(a), a pair of decorative plywood panels 17 are attached to the rectifying wall main body 3D constituting the rectifying wall 1D in advance so as to sandwich the end face 3d of the rectifying wall main body 3D along the third direction D3. When the rectifying wall main body 3D is stacked in a predetermined position, the leading ends of the pair of decorative plywood panels 17 abut against the surface 2a of the side wall 2. By stacking these rectifying wall main bodies 3D sequentially and temporarily installing them, a space for casting the filler material 13 is defined by the pair of decorative plywood panels 17, the end face 3d of the rectifying wall main body 3D, and the surface 2a of the side wall 2 without installing a separate formwork. The filler material 13 may be cast in this space, and the pair of decorative plywood panels 17 may be removed from the mold after the filler material 13 has hardened.

[0086] FIG. 10(b) is a plan view showing another modified formwork used to cast the filler material in the joining process. In the flow rectifying wall installation structure 100E shown in FIG. 10(b), a pair of protruding plate portions 18 are integrally molded with the flow rectifying wall main body 3E, which constitutes the flow rectifying wall 1E, so as to sandwich the end face 3d of the flow rectifying wall main body 3E along the third direction D3. When the flow rectifying wall main body 3E is stacked in a predetermined position, the tips of the pair of protruding plate portions 18 abut against the surface 2a of the side wall 2. By stacking these flow rectifying wall main bodies 3E one after another for temporary installation, a space for casting the filler material 13 is defined by the pair of protruding plate portions 18, the end face 3d of the flow rectifying wall main body 3E, and the surface 2a of the side wall 2, without the need for a separate formwork. With this flow rectifying wall main body 3E, after the filler material 13 is cast in the space and hardens, demolding is not required. The number of layers in which the flow-straightening wall bodies 3D and 3E are stacked in sequence may be up to the top layer as shown in Figure 4(a), or they may be stacked one cycle at a time when pouring in multiple cycles as shown in Figure 4(b).

[0087] In the above embodiment and modified example, the first predetermined length by which the pair of base ends 11a protrude and extend from the end face 3d of the flow rectifying wall main body 3 and the second predetermined length by which the pair of base ends 12a protrude and extend from the surface 2a of the side wall 2 are equal to each other for the first loop reinforcing bars 11 and the second loop reinforcing bars 12 adjacent in the normal direction of the imaginary loop surface. However, these lengths may be different. For example, in the flow rectifying wall installation structure 100F shown in FIG. 11, the positions of the closed curves formed by the intersection of the first loop reinforcing bars 11F, 11G and the second loop reinforcing bars 12F, 12G may be different between the closed curves adjacent in the normal direction of the imaginary loop surface. In other words, the first loop reinforcing bars 11F, 11G protruding from the end face 3d of the flow rectifying wall main body 3F constituting the flow rectifying wall 1F and the second loop reinforcing bars 12F, 12G protruding from the surface 2a of the side wall 2 have some large protrusions and some small protrusions. In this case, the first loop reinforcing bar 11F and the second loop reinforcing bar 12F are butted against each other, and the first loop reinforcing bar 11G and the second loop reinforcing bar 12G are butted against each other. Between the butted reinforcing bars, there are cross sections where no reinforcing bar exists along the third direction D3. However, when the first loop reinforcing bars 11F, 11G and the second loop reinforcing bars 12F, 12G are evaluated side by side, there are no cross sections where no reinforcing bar exists along the third direction D3. Therefore, the strength of the waterway S1 against the force exerted by the water W can be improved without placing a third loop reinforcing bar 16, as shown in Figure 9(b), for example.

[0088] In the above embodiment and modified examples, the pair of base ends 11a of the first loop reinforcing bars 11-11G protrude from the end faces 3d of the flow rectifying wall main bodies 3-3F, but this is not limited to this example. It may be a side end that is an end of the flow rectifying wall main body 3 on the side of the pair of side walls 2. For example, if the end face of the flow rectifying wall main body 3 is not flat but has projections and depressions, the first loop reinforcing bars may protrude from the depressions.

[0089] In the above embodiment and modified example, all of the first loop reinforcing bars 11 and the second loop reinforcing bars 12 at the joint 10 form imaginary loop surfaces L1 and L2 extending along a vertical plane, and all of the first loop reinforcing bars 11A and the second loop reinforcing bars 12A at the joint 10A form imaginary loop surfaces L3 and L4 extending along a horizontal plane. However, the orientation of the imaginary loop surfaces does not have to be uniform across all of the flow rectifying wall main bodies 3 and 3A. For example, some flow rectifying wall main bodies 3 may have imaginary loop surfaces L1 and L2 extending along a vertical plane, while the remaining flow rectifying wall main bodies 3A may have imaginary loop surfaces L3 and L4 extending along a horizontal plane. The orientation of the imaginary loop surfaces can be appropriately selected depending on, for example, the construction conditions at the site. Note that, when focusing on one flow rectifying wall main body 3, the orientation of the imaginary loop surface may be uniform.

[0090] In the above-described embodiment and modified example, an example was shown in which the second loop reinforcing bars 12-12G are embedded in advance when constructing a new side wall 2, but this is not limiting. It is also possible to add the second loop reinforcing bars 12-12G to an existing side wall 2 after constructing the side wall 2. For example, holes may be dug in the side wall 2, a pair of straight portions 12c may be inserted into the holes as anchor bars, and the holes may be filled with mortar or the like to harden the second loop reinforcing bars 12 so that they protrude from the surface 2a of the side wall 2. This allows the installation structures 100-100F for the rectifying walls to be applied, for example, when adding or replacing the rectifying walls 1-1F.

[0091] Additionally, the shape, size, material, number and arrangement of the flow rectifying walls 1 to 1F, side wall 2, flow rectifying wall main bodies 3 to 3F and joints 10 to 10F can be changed as appropriate within the scope of the above-mentioned gist. [Explanation of symbols]

[0092] 1-1F...rectifying wall, 2...side wall, 3c...through hole, 3d...end face (side end), 10, 10A-10F...joint, 11, 11A-11G...first loop reinforcing bar, 12, 12A-12G...second loop reinforcing bar, 13...filling material, 14...penetrating reinforcing bar (reinforcement material), 16...third loop reinforcing bar, 100-100F...rectifying wall installation structure, S...water purification facility, S1...waterway, W...water.

Claims

1. A flow straightening wall installation structure in which a flow straightening wall having through holes through which water passes to straighten the water flow is installed in a waterway of a water purification facility, A plurality of flow straightening wall bodies extending so as to connect a pair of side walls of the water channel; a joint portion that joins the flow straightening wall main body and the side wall, The joint portion is a straightening wall installation structure having a first loop reinforcing bar protruding from the side end of the straightening wall main body, a second loop reinforcing bar protruding from the side wall, and a filler material that is poured to embed the first loop reinforcing bar and the second loop reinforcing bar.

2. 2. The installation structure of a flow straightening wall according to claim 1, wherein the first loop reinforcing bars and the second loop reinforcing bars form an imaginary loop surface extending along a vertical plane.

3. 2. The installation structure of a flow straightening wall according to claim 1, wherein the first loop reinforcing bars and the second loop reinforcing bars form an imaginary loop surface extending along a horizontal plane.

4. The first loop reinforcing bar and the second loop reinforcing bar form a virtual loop surface, 3. The installation structure of a flow straightening wall according to claim 1, wherein, when viewed from the normal direction of the loop surface, adjacent first loop reinforcing bars and adjacent second loop reinforcing bars overlap each other at the joint.

5. The first loop reinforcing bar and the second loop reinforcing bar form a virtual loop surface, When viewed from the normal direction of the loop surface, the adjacent first loop reinforcing bars and the adjacent second loop reinforcing bars do not overlap with each other at the joint, The installation structure of a flow-straightening wall described in claim 1 or 2, wherein the joint has a third loop reinforcing bar that overlaps both the adjacent first loop reinforcing bar and the adjacent second loop reinforcing bar when viewed from the normal direction of the loop surface.

6. The first loop reinforcing bar and the second loop reinforcing bar form a virtual loop surface, 3. The installation structure of a flow straightening wall according to claim 1 or 2, wherein the joint portion has a reinforcing material arranged inside the first loop reinforcing bar and the second loop reinforcing bar so as to intersect with the loop surface.

7. A method for manufacturing a flow rectifying wall that is installed in a waterway of a water purification facility and has through holes through which water passes to regulate the water flow, a step of manufacturing a plurality of flow straightening wall bodies that extend to connect a pair of side walls of the water channel and have side end portions joined to the pair of side walls by joints, thereby constituting the flow straightening wall; The step of manufacturing the flow straightening wall body includes: a step of placing a formwork that defines the outer shape of the flow straightening wall main body; A step of arranging first loop reinforcing bars in the portion of the outer shape that will become the side end portion; and pouring concrete into the formwork so that the first loop reinforcing bar protrudes from the side end portion. A method for manufacturing a flow-regulating wall, wherein in the step of arranging the first loop reinforcing bars, welded closed reinforcing bars are used as the first loop reinforcing bars.

8. A method for installing a flow straightening wall having through holes through which water passes to straighten the water flow in a waterway of a water purification facility, comprising: an arrangement step of extending a plurality of flow straightening wall bodies so as to connect a pair of side walls of the water channel; a joining step of joining side ends of the flow straightening wall main body to the pair of side walls, In the arranging step, the flow straightening wall main body is arranged in a state in which first loop reinforcing bars protrude from the side end portion of the flow straightening wall main body and second loop reinforcing bars protrude from the side wall, In the joining step, A filler material is poured to embed the first loop reinforcing bar and the second loop reinforcing bar, A method for installing a straightening wall, in which the pouring of the filler material is carried out in stages multiple times, targeting some of the plurality of straightening wall bodies.

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