Frame for ditch cover and construction method for ditch cover

Abstract

To make a nut and the surroundings thereof less likely to be clogged with mud and sand, and even if clogged, allow the mud and sand to be easily discharged by protruding a nut structure part from a receiving frame to the inside of a groove.SOLUTION: A ditch cover receiving frame has a nut structure part 20 provided on an inner vertical surface 12 of a receiving frame 10 provided on the top of a groove 40. The nut structure part includes an upper plate 22 provided with an upper hole 23 configured larger than the screw diameter of a bolt 3, a lower plate 24 provided with a lower hole 25 with a position and size corresponding to the upper hole, and a side plate 26 joining the upper plate and the lower plate at a predetermined distance. The ditch cover receiving frame also includes a box-shaped member 21 protruding from the inner longitudinal surface toward the inside of the groove, an anti-rotation plate 28 placed between the upper and lower plates, the edge of which is in contact with the side plate so that it cannot turn at or more than a predetermined angle and having a through hole 29 through which the bolt penetrates, and a nut 30 provided at a position corresponding to the through hole of the anti-rotation plate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a groove cover receiving frame for placing a groove cover, and a groove cover construction method using the groove cover receiving frame. [Background technology]

[0002] Conventionally, as a fixing structure for gratings, Japanese Patent Application Laid-Open No. 2014-114643 discloses a technology in which a receiving frame on which the grating is placed has a receiving frame hole that is larger than the diameter of the threaded portion of the connecting bolt and through which the connecting bolt is inserted so that its position can be adjusted horizontally, a box body with an open top that is fixed to the underside of the receiving frame at the position where the receiving frame hole is formed, and a nut that is housed within the box body so that its position can be adjusted horizontally and that engages with the peripheral wall of the box body to prevent it from rotating. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-114643 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Patent Document 1, the box body is placed under the receiving frame and is buried in concrete, which causes the problem that it is difficult to remove mud, sand, etc. when it gets into the box body. Although claim 4 etc. of Patent Document 1 describes that part of the box body is opened to communicate with the inside of the trench, the same problem still exists, although to a different degree.

[0005] The present invention has been made in consideration of the above points, and aims to provide a receiving frame for a gutter cover and a gutter cover construction method that functions as a floating nut while having the nut structure protrude into the groove from the receiving frame, making it less likely for mud, sand, etc. to become clogged around the nut and its surroundings, and even if it does become clogged, it can be easily removed. [Means for solving the problem]

[0006] The groove cover receiving frame of the present invention is A groove cover receiving frame is provided at the top of the groove, and has a horizontal receiving surface for placing a groove cover thereon and an inner vertical surface along the inner surface of the groove, and the groove cover is fixed with a bolt. A nut structure portion is provided on the inner vertical surface, The nut structure includes: a box-shaped member including an upper plate having an upper hole larger than the thread diameter of the bolt, a lower plate having a lower hole of a size and position corresponding to the upper hole, and side plates joining the upper plate and the lower plate at a predetermined distance, the box-shaped member protruding from the inner vertical surface toward the inside of the groove; a rotation prevention plate disposed between the upper plate and the lower plate, the edge of which abuts against the side plate to prevent rotation beyond a predetermined angle, and the plate having a through hole through which the bolt passes; a nut provided at a position corresponding to the through hole of the anti-rotation plate; The present invention is characterized by comprising:

[0007] According to the groove cover receiving frame of the present invention, the nut structure protrudes from the receiving frame toward the inside of the groove, with nothing below the nut structure. Furthermore, the upper and lower plates of the box-shaped member are provided with upper and lower holes, respectively, and the anti-rotation plate is also provided with a through-hole, penetrating from the upper plate to the lower plate. This allows mud, sand, and other debris that has entered the nut structure to be easily removed. Furthermore, the anti-rotation plate and nut function as floating nuts, allowing for some freedom of movement within the box-shaped member. This allows bolts to be fastened without any problems even if the bolt holes in the groove cover are slightly misaligned.

[0008] A preferred example of the groove cover receiving frame of the present invention is: Two of the side surfaces of the box-shaped member are open.

[0009] In a preferred embodiment of the gutter cover receiving frame of the present invention, the side of the box-shaped member is open, which allows mud and sand to be more effectively discharged from the box-shaped member. Furthermore, because two sides are open, at least one opening is maintained regardless of which side of the box-shaped member is joined to the inner vertical surface of the receiving frame.

[0010] A preferred example of the groove cover receiving frame of the present invention is: The nut protrudes from the upper surface of the anti-rotation plate and the diameter of the upper hole is larger than the diameter of the nut, so that when the groove cover is fixed with the bolt, the anti-rotation plate floats between the upper plate and the lower plate, and when the nut structure is placed upside down and the groove cover is fixed with the bolt, the anti-rotation plate is pressed against the lower plate.

[0011] In a preferred embodiment of the gutter cover receiving frame of the present invention, when the bolt is tightened, the upper end of the nut abuts against the back surface of the gutter cover, and the anti-rotation plate is not pressed against either the upper or lower plate. Therefore, even after the gutter cover is tightened with the bolt, the gutter cover can be moved by the amount of play between the nut and the upper hole, allowing the position of the gutter cover to be adjusted after tightening the bolt. Furthermore, if the nut structure is used upside down, when the gutter cover is tightened with the bolt, the anti-rotation plate is pressed against the lower plate, preventing the gutter cover from moving. Furthermore, since the upper hole is larger than the nut and the lower hole is positioned and sized to correspond to the upper hole, it is easier to remove mud, sand, etc. that has entered the box-shaped member.

[0012] A preferred example of the groove cover receiving frame of the present invention is: The protruding dimension of the nut from the anti-rotation plate is configured to be smaller than the thickness of the upper plate and the lower plate, and the diameter of the upper hole is configured to be larger than the diameter of the nut, so that when the nut structure is placed face up or upside down and the groove cover is fixed with the bolt, the anti-rotation plate is pressed against the upper plate or the lower plate.

[0013] According to a preferred embodiment of the groove cover receiving frame of the present invention, the groove cover will not move after the bolt is fastened, regardless of whether the nut structure portion is used on the front or back side.

[0014] A preferred example of the groove cover receiving frame of the present invention is: The positions of the upper hole and the lower hole are away from the center of the upper plate and the lower plate, and different bolt positions can be accommodated by turning the box-shaped member upside down or changing the side of the box-shaped member joined to the inner vertical surface.

[0015] In a preferred embodiment of the groove cover receiving frame of the present invention, when the bolt holes of the groove cover are located near the edge of the frame, for example, at a corner of the receiving frame, the nut structure can be used upside down or the side (side surface) of the nut structure that joins to the inner vertical surface can be changed, so that the same nut structure can be used on opposite sides of the groove. Similarly, it can be adapted to multiple positions of the bolt holes of the groove cover.

[0016] A preferred example of the groove cover receiving frame of the present invention is: A reinforcing rib that abuts against the inner surface of the groove is provided on the lower surface of either the lower plate or the upper plate that is located lower.

[0017] According to a preferred example of the receiving frame for a groove cover of the present invention, even when the nut structure is attached to a receiving frame having a low height of the inner vertical surface, the joint with the inner vertical surface will not break.

[0018] The groove cover construction method of the present invention comprises: A trench cover construction method using the above-mentioned trench cover receiving frame, A receiving frame manufacturing process in which the receiving frame for the groove cover is first manufactured; A frame installation process for installing the groove cover frame at an installation location; a groove cover manufacturing process in which the groove cover is manufactured after the receiving frame manufacturing process; a groove cover installation process of installing the groove cover on the groove cover receiving frame and fixing it with the bolts; The present invention is characterized by comprising:

[0019] According to the gutter cover construction method of the present invention, in addition to the above-mentioned effects of the gutter cover receiving frame, the gutter cover receiving frame, which is required first for construction, can be manufactured first. Generally, the gutter cover receiving frame and the gutter cover are manufactured as a pair to align the positions of the bolt holes in the gutter cover with the nuts on the receiving frame. In particular, flat head bolts are sometimes used to prevent protrusions from forming on the gutter cover. In such cases, more precise alignment is required, and it was necessary to manufacture the gutter cover receiving frame and the gutter cover as a pair. For this reason, even though the gutter cover receiving frame was required first at the construction site, the gutter cover and the gutter cover receiving frame were manufactured simultaneously at the manufacturing site. On the other hand, the gutter cover construction method of the present invention eliminates the need to precisely determine the positions of the bolt holes in the gutter cover. The gutter cover receiving frame can be manufactured and delivered first, and the gutter cover can be manufactured later, thereby shortening delivery times and reducing work-in-progress.

[0020] The groove cover construction method of the present invention comprises: A groove cover construction method using the above groove cover receiving frame, a receiving frame manufacturing process for manufacturing the groove cover receiving frame by arranging the nut structure portion facing outward; A frame installation process for installing the groove cover frame at an installation location; a groove cover manufacturing process for manufacturing the groove cover; a groove cover installation process of installing the groove cover on the groove cover receiving frame and fixing it with the bolts; a position adjustment step of adjusting the position of the groove cover by an amount of play between the nut and the upper hole as needed after the groove cover is fixed with the bolt; The present invention is characterized by comprising:

[0021] The groove cover construction method of the present invention comprises: A groove cover construction method using the above groove cover receiving frame, A receiving frame manufacturing process in which at least a portion of the nut structure is disposed upside down to manufacture the receiving frame for the groove cover; A frame installation process for installing the groove cover frame at an installation location; a groove cover manufacturing process for manufacturing the groove cover; a groove cover installation process of installing the groove cover on the groove cover receiving frame and fixing it with bolts; The present invention is characterized by comprising:

[0022] These gutter cover construction methods of the present invention can achieve the same effects as the gutter cover receiving frame described above.

[0023] The groove cover construction method of the present invention comprises: A method for constructing a trench cover by using an existing frame to manufacture the trench cover frame and using the trench cover frame, a groove cover manufacturing process for manufacturing new groove covers; A removal process to remove the old gutter cover, A receiving frame manufacturing process in which the nut structure part is joined to the inner vertical surface of an existing receiving frame to manufacture the receiving frame for the groove cover; a gutter cover installation process of installing a new gutter cover in the gutter cover receiving frame and fixing it with bolts; The present invention is characterized by comprising:

[0024] According to the method for constructing a trench cover of the present invention, the trench cover frame of the present invention can be manufactured at the construction site using an existing frame, which eliminates the need to remove the frame and scrape and pour concrete for new construction, thereby reducing construction costs and time. [Effects of the Invention]

[0025] As described above, according to the receiving frame for a gutter cover and the gutter cover construction method of the present invention, while functioning as a floating nut, the nut structure protrudes from the receiving frame into the inside of the gutter, making it difficult for mud, sand, etc. to become clogged around the nut and its surroundings, and even if it does become clogged, it can be easily removed. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a diagram illustrating a groove cover receiving frame according to one embodiment of the present invention. FIG. [Figure 2] FIG. 4 is a diagram illustrating a nut structure. [Figure 3] 10A and 10B are diagrams illustrating another example of the nut structure portion. [Figure 4] 10 is a diagram illustrating an example in which a part of the nut structure is installed upside down at the corner of the receiving frame. FIG. [Figure 5] 10A and 10B are diagrams illustrating the internal positional relationship of the nut structure. [Figure 6] FIG. 10 is another diagram illustrating the internal positional relationship of the nut structure. [Figure 7] 10A and 10B are diagrams illustrating a nut structure provided with reinforcing ribs. [Figure 8] FIG. 1 is a diagram illustrating a trench cover construction method. [Figure 9] Another diagram illustrating the trench cover construction method. [Figure 10] Another diagram illustrating the trench cover construction method. [Figure 11] Another diagram illustrating the trench cover construction method. [Figure 12] Another diagram illustrating the trench cover construction method. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments of the gutter cover receiving frame 1 and gutter cover construction method of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic diagram of the gutter cover receiving frame 1 of this embodiment. Fig. 2(A) is a perspective view of the nut structure 20, Fig. 2(B) is a perspective view of the nut structure 20 viewed from a different angle, Fig. 2(C) is a plan view of the nut structure 20, Fig. 2(D) is a bottom view of the nut structure 20, Fig. 2(E) is a plan view of the nut structure 20 with the upper plate 22 removed, and Fig. 2(F) is a cross-sectional view taken along line c1 in Fig. 2(C). Figure 3(A) is a plan view of the nut structure 120 in which the positions of the upper hole 123 and the lower hole 125 are away from the center of the upper plate 122 and the lower plate 124, and the nut 130 protrudes from both sides of the anti-rotation plate 128, Figure 3(B) is a bottom view of the nut structure 120 shown in Figure 3(A), and Figure 3(C) is a cross-sectional view taken along line AA in Figure 3(A).

[0028] First, the gutter cover frame 1 will be described. As shown in FIG. 1 , the gutter cover frame 1 of this embodiment includes a frame 10 and a nut structure 20. The frame 10 is provided above the groove 40, forming the edge near the upper end of the groove 40 and supporting the gutter cover 2. It includes a horizontal support surface 11, an inner vertical surface 12, and an outer vertical surface 13. The horizontal support surface 11 is where the end of the gutter cover 2 rests. The inner vertical surface 12 is a vertical surface that is substantially flush with the inner vertical surface 41 and extends along the inner side surface 41 of the groove 40. The nut structure 20 is attached to this inner vertical surface 12 by welding or other methods. The outer vertical surface 13 restricts the widthwise movement of the gutter cover 2 and has a height approximately equal to the thickness of the gutter cover 2. The gutter cover 2 is fixed to the nut structure 20 by bolts 3 inserted through bolt holes 4.

[0029] As shown in FIGS. 2A to 2F, the nut structure 20 includes a box-shaped member 21, a rotation prevention plate 28, and a nut 30. The box-shaped member 21 is a substantially rectangular parallelepiped including an upper plate 22, a lower plate 24, and a side plate 26. The upper plate 22 is rectangular in plan view and has an upper hole 23 larger than the thread diameter of the bolt 3, forming the upper surface of the nut structure 20. The lower plate 24 is rectangular in bottom view and has a lower hole 25 corresponding in position and size to the upper hole 23 of the upper plate 22, forming the lower surface of the nut structure 20. As shown in FIG. 2C, the positions of the upper hole 23 and lower hole 25 are aligned with the center line c1 of the box-shaped member 21 in plan view but spaced apart from a center line c2 perpendicular to the center line c1. This allows the distances d1, d2, and d3 from each side (side surface) e1, e2, and e3 of the box-shaped member 21 to the nut 30 to be varied. Then, by joining edges e1, e2, and e3 corresponding to desired distances d1, d2, and d3 to the inner vertical surface 12 of the receiving frame 10, it is possible to accommodate various positions of the bolt holes 4. In addition, in this embodiment, the diameters of the upper hole 23 and the lower hole 25 are configured to be larger than the diameter nd of the nut 30. The side plates 26 join the upper plate 22 and the lower plate 24 with a predetermined distance between them, and configure the side surfaces of the nut structure 20. The side plates 26 are provided on only two opposing surfaces of the side surfaces that configure the box-shaped member 21, and the other two surfaces are openings 27.

[0030] The anti-rotation plate 28 is rectangular in plan view and has a through-hole 29 through which the bolt 3 passes, and its edge abuts against the side plate 26 to prevent it from rotating beyond a predetermined angle. The size of the anti-rotation plate 28 is smaller than the inner dimensions of the box-shaped member 21. The nut 30 is joined to the upper surface of the anti-rotation plate 28 at a position corresponding to the through-hole 29, and the groove cover 2 is fixed by tightening the bolt 3. The upper end of the nut 30 is inserted into the upper hole 23. This allows the nut 30 to move horizontally within the upper hole 23 until the periphery abuts against the edge of the upper hole 23 (see dimension line ed in Figure 2(F)), and also prevents the anti-rotation plate 28 and the nut 30 from falling out of the opening 27 of the box-shaped member 21.

[0031] As shown in FIG. 3(A), the upper hole 123 and the lower hole 125 in the nut structure 120 can be positioned away from both the center lines c3 and c4 of the box-shaped member 121 in a plan view. This allows the distances d4, d5, d6, and d7 from each side e4, e5, e6, and e7 of the box-shaped member 121 to the nut 130 to be varied. Furthermore, in this nut structure 120, the nut 130 protrudes from both sides of the anti-rotation plate 128. As shown in FIG. 3(B), the nut structure 120 can be used upside down in the same way. By using this at a corner of the receiving frame 10 as shown in FIG. 4, the same nut structure 120 can be used on both the right and left sides of the corner in the figure. Note that this nut structure 120 may also be configured so that the nut 30 protrudes only from the top surface of the anti-rotation plate 28, as shown in FIG. 2(F).

[0032] Next, with reference to Figures 5(A) to 5(D), detailed positional relationships within the nut structure 20 will be described. Figure 5(A) is an enlarged view of the nut structure 20 shown in Figure 2(F) with the anti-rotation plate 28 abutting against the lower plate 24. In this state (face up), the height dimension h2 from the outer surface of the upper plate 22 to the inner surface of the lower plate 24 is greater than the height dimension h1 from the top end of the nut 30 to the bottom surface of the anti-rotation plate 28. As a result, the top end of the nut 30 is inserted into the upper hole 23 and is lowered by a dimension s1 below the outer surface of the upper plate 22. Therefore, as shown in Figure 5(B), when the groove cover 2 is fixed to the nut 30 with the bolt 3, the anti-rotation plate 28 rises by the dimension s1 and floats between the upper plate 22 and the lower plate 24. As a result, even when the groove cover 2 is fixed to the nut structure 20 with the bolt 3, the groove cover 2 can be moved by the amount of play between the nut 30 and the upper hole 23 (marked in Figure 2(F)). Furthermore, as shown in FIG. 5(C), the groove cover 2 can be lifted, making it easier to move the groove cover 2.

[0033] On the other hand, to prevent the groove cover 2 from moving after it has been fixed to the nut structure 20 with the bolt 3, the nut structure 20 shown in Fig. 5(A) can be turned upside down and used as shown in Fig. 5(D). In this case, when the groove cover 2 is fastened with the bolt 3, the anti-rotation plate 28 is pressed against the inner surface of the lower plate 24. This prevents movement even if there is play between the nut 30 and the upper hole 23, and allows the groove cover 2 to be completely fixed.

[0034] 6(A) is an enlarged view of the nut structure 120 shown in FIG. 3(C) with the anti-rotation plate 128 in contact with the upper plate 122. Here, the protrusion dimension h3 of the nut 130 from the anti-rotation plate 128 is configured to be smaller than the thickness h4 of the upper plate 122. The diameter of the upper hole 123 is configured to be larger than that of the nut 130, and the upper end of the nut 130 is inserted into the upper hole 123. As a result, when the bolt 3 is fastened to the nut 130, the anti-rotation plate 128 is pressed against the inner surface of the upper plate 122, and the nut 130 and the anti-rotation plate 128 do not move.

[0035] Furthermore, the nut structure 120 shown in Figure 6(B) is intended for use when the nut structure 120 shown in Figure 6 is turned upside down, and is a diagram showing a state in which the anti-rotation plate 128 of the nut structure 120 shown in Figure 6(A) is abutted against the lower plate 124. Here too, the protrusion dimension h5 of the nut 130 from the anti-rotation plate 128 is configured to be smaller than the thickness h6 of the lower plate 124. In addition, the diameter of the pilot hole 125 is configured to be larger than that of the nut 130, and the lower end of the nut 130 is inserted into the pilot hole 125. As a result, when the bolt 3 is tightened onto the nut 130, the anti-rotation plate 128 is pressed against the inner surface of the lower plate 124, preventing the nut 130 and the anti-rotation plate 128 from moving.

[0036] In addition, in the nut structure 20, 120 shown in Figures 5(A) and 6(A)(B), two of the side surfaces of the box-shaped member 21 are opened to form openings 27, 127, and the upper hole 23, 123 and the lower hole 25, 125 are provided at the same position and size. Furthermore, the nut structure 20, 120 protrudes from the inner vertical surface 12 into the groove 40. As a result, even if mud or sand gets into the box-shaped member 21, 121, it can be quickly discharged through the openings 27, 127 and the lower hole 25, 125. Even if mud hardens inside the box-shaped member 21, 121, the mud can be easily removed by screwing a bolt serving as a handle into the nut 30, 130 to move the anti-rotation plate 28, 128 between the upper plate 22, 122 and the lower plate 24, 124, and inserting a tool such as a screwdriver through the opening 27, 127 to clean it.

[0037] Furthermore, as shown in FIG. 7(A), the nut structure 220 may include a reinforcing rib 231 on the underside of the lower plate 224 that abuts against the inner vertical surface 41 of the groove 40. As shown in FIG. 7(B), some types of receiving frame 210 have a small height (width) of the inner vertical surface 212. In the case of such a receiving frame 210, the bonding strength with the nut structure 20 tends to be weak, making the nut structure 220 and the box-shaped member 221 more likely to break if stepped on from above. To prevent this, the reinforcing rib 231 abuts against the inner vertical surface 41 of the groove 40, preventing breakage of the nut structure 220. When the nut structure 220 is turned upside down and used with the upper plate 222 facing downward, the reinforcing rib 231 is provided on the underside of the upper plate 222.

[0038] Next, in consideration of the configuration and action of the above-described receiving frame for a groove cover 1, an embodiment of a groove cover construction method using the receiving frame for a groove cover 1 will be described.

[0039] [First embodiment] The gutter cover construction method of this embodiment includes a receiving frame manufacturing process, a receiving frame installation process, a gutter cover manufacturing process, and a gutter cover installation process. The frame manufacturing process is a process in which a gutter cover frame 1 as shown in Figure 1 is manufactured in a factory or the like. At this time, the gutter cover 2 and the gutter cover frame 1 are generally manufactured simultaneously and in pairs to align the bolt holes in the gutter cover 2 with the nuts 30 on the frame 10 side. However, in this embodiment, the nuts 30 move within the nut structure 20, so there is no need to precisely align the positions of the bolt holes 4 and the nuts 30. This allows the gutter cover frame 1 to be manufactured and delivered before the gutter cover 3. In the frame manufacturing process, in order to maintain a predetermined distance between the paired frames 10, width determining members 14 are provided between the frames 10 until the frame installation process is completed (see Figure 8).

[0040] Next, as shown in Figure 8, the frame installation process involves installing the groove cover frame 1 at the installation location. This involves placing the groove cover frame 1 in the designated position from the base concrete 43 using anchors 45 and reinforcing bars 46. Next, if necessary, formwork or the like is used to pour the finishing concrete 44 up to the point indicated by the dashed line. Once the finishing concrete 44 has cured, the width setting material 14 can be removed. Then, as shown in Figure 11, the groove cover frame 1 is fixed in place with concrete 42.

[0041] Next, in the gutter cover manufacturing process, the gutter cover 2 is manufactured after the receiving frame manufacturing process. Note that the manufacturing of the gutter cover 2 may be performed after the manufacturing of the gutter cover receiving frame 1, and the order of the manufacturing of the gutter cover 2 and the receiving frame installation process may be before, after, or parallel to the above-mentioned process.

[0042] Next, as shown in Figure 12, in the gutter cover installation process, the gutter cover 2 is installed on the gutter cover receiving frame 1 and secured with the bolt 3. At this time, the nut 30 moves by an amount corresponding to the play with the upper hole 23, so the position of the gutter cover 2 can be finely adjusted during installation. Furthermore, even if the machining position of the bolt hole 4 of the gutter cover 2 is slightly misaligned, the bolt 3 can be fastened to the nut 30 without any problems.

[0043] [Second embodiment] The gutter cover construction method of this embodiment includes a receiving frame manufacturing process, a receiving frame installation process, a gutter cover manufacturing process, a gutter cover installation process, and a position adjustment process.

[0044] The frame manufacturing process, frame installation process, gutter cover manufacturing process, and gutter cover installation process can be understood by referring to the first embodiment described above, and therefore a description thereof will be omitted. At this time, as shown in Fig. 5(A), the nut structure 20 is joined to the frame 10 with the upper plate 22 facing up. Note that in this embodiment, the gutter cover manufacturing process may be performed after the frame manufacturing process as in the first embodiment, but it is not necessarily required that the gutter cover manufacturing process be performed after the frame manufacturing process (the same applies to the third and fourth embodiments).

[0045] Then, in the position adjustment process, after the groove covers 2 are fixed with the bolts 3, the position of the groove covers 2 is adjusted as necessary by the amount of play between the nuts 30 and the upper holes 23 (see symbol ed in FIG. 2(F)). This is done by the action of the nut structures 20, 120 shown in FIGS. 5(A) to 5(C) and 6(A) and 6(B) as already explained. This position adjustment process may be performed for each groove cover 2 after the groove covers 2 are fixed with the bolts 3, or may be performed after multiple groove covers 2 are fixed with the bolts 3. [Third embodiment] The gutter cover construction method of this embodiment includes a receiving frame manufacturing process, a receiving frame installation process, a gutter cover manufacturing process, and a gutter cover installation process.

[0046] The frame manufacturing process, frame installation process, gutter cover manufacturing process, and gutter cover installation process can be understood by referring to the first embodiment described above, and therefore will not be described here. However, in this embodiment, in the frame manufacturing process, the nut structure 20 shown in FIG. 5(A) is used to join the frame 10 in an upside-down state with the lower plate 24 facing up. In this case, when the gutter cover 2 is installed, the nut 30 moves by an amount corresponding to the play with the upper hole 23 (see symbol ed in FIG. 2(F)), allowing the gutter cover 2 to be installed while fine-tuning its position. Then, after the bolt 3 is tightened, the anti-rotation plate 28 is pressed against the lower plate 24, completely fixing the gutter cover 2 (see FIG. 5(D)).

[0047] [Fourth embodiment] The method for constructing a trench cover according to this embodiment includes a trench cover manufacturing process, a removal process, a frame manufacturing process, and a trench cover installation process. This construction is carried out using an existing frame 310 as shown in FIG.

[0048] First, in the gutter cover manufacturing process, a new gutter cover 2 (see Figure 1) is manufactured. This gutter cover manufacturing process can also be carried out in parallel with the removal process and frame manufacturing process described below. Next, in the removal process, the old gutter cover 302 is removed from the gutter cover 302 and frame 310 as shown in Figure 9, resulting in the state shown in Figure 10. At this time, the gutter cover 302 is fixed with bolts or the like (not shown), so these bolts are also removed.

[0049] Next, in the frame manufacturing process, the nut structure 20 is joined to the inner vertical surface 312 of the existing frame 310 shown in FIG. 10 to manufacture the gutter cover frame 1 shown in FIG. 11 . Conventionally, the positions of the bolt holes 4 in the newly manufactured gutter cover 2 and the nuts on the existing frame 310 often do not align. Therefore, the concrete 42 surrounding the existing frame 310 is removed, and the newly manufactured frame is then installed. However, in this embodiment, the position of the nuts 30 can be adjusted using the nut structure 20, allowing the existing frame 310 to be used to manufacture the gutter cover frame 1 on-site. Next, in the gutter cover installation process, as shown in FIG. 12 , the new gutter cover 2 is secured to the gutter cover frame 1 manufactured using the existing frame 310 with bolts 3.

[0050] As described above, according to the groove cover receiving frame of this embodiment, the nut structure protrudes into the groove, and the lower hole is provided at the same position and size as the upper hole. Furthermore, the box-shaped member has only two side panels, and the remaining two sides are open. This makes the inside of the nut structure less likely to become dirty or clogged with mud or sand. Even if the inside of the nut structure becomes clogged with mud, the anti-rotation plate can be moved vertically and horizontally within the box-shaped member, and tools can be inserted through the opening, making it easy to clean.

[0051] In addition, the nut structure can be used upside down, and the positions of the upper and lower holes are offset from the center lines c1, c2, c3, and c4 of the box-shaped member, allowing it to be used in accordance with various bolt positions. Furthermore, by providing a nut only on the upper side of the anti-rotation plate, the position of the groove cover can be adjusted even after the bolt is fastened when the nut structure is turned upside down. On the other hand, the groove cover can be completely fixed by turning the nut structure upside down.

[0052] Furthermore, according to the gutter cover construction method of this embodiment, there is no need to manufacture the gutter cover and the gutter cover receiving frame as a pair, and only the gutter cover receiving frame that is needed first for construction can be manufactured and delivered in advance. This allows for shorter delivery times and reduced work-in-progress. Furthermore, since the position of the gutter cover can be adjusted even after the gutter cover is fixed to the nut structure with bolts, construction can be completed quickly. Furthermore, in embodiments that utilize existing receiving frames, there is no need to replace the receiving frame, which eliminates the need to scrape and pour concrete, shortening construction time and reducing costs.

[0053] The above-described gutter cover receiving frame and gutter cover construction method are examples of the present invention, and their configurations can be modified as appropriate within the scope of the invention. [Explanation of symbols]

[0054] 1··Gutter cover frame, 2,302··Gutter cover, 3··Bolt, 4··Bolt hole, 10,210,310··Receiving frame, 11··Horizontal receiving surface, 12,212,312··Inner vertical surface, 13··Outer vertical surface, 14··Width determining material, 20,120,220··Nut structure portion, 21,121··Box-shaped member, 22,122,222··Upper plate, 23,123··Upper hole, 24,124,224··Lower plate, 25,125··Lower hole, 26,126··Side plate, 27,127··Opening, 28,128··Anti-rotation plate, 29··Through hole, 30,130··Nut, 231··Reinforcing rib, 40··Groove, 41··Inner surface, 42··Concrete, 43··Base concrete, 44··Finishing concrete, 45··Anchor, 46··Reinforcement,

Claims

1. A receiving frame for a gutter cover is provided on the upper part of the gutter, and has a horizontal receiving surface for placing a gutter cover thereon and an inner vertical surface along the inner surface of the gutter, and the gutter cover is fixed with a bolt. A nut structure is provided on the inner vertical surface, The nut structure includes: a box-shaped member including an upper plate having an upper hole larger than the thread diameter of the bolt, a lower plate having a lower hole of a position and size corresponding to the upper hole, and a side plate joining the upper plate and the lower plate at a predetermined distance, the box-shaped member protruding from the inner vertical surface toward the inside of the groove; a rotation prevention plate disposed between the upper plate and the lower plate, the edge of which abuts against the side plate to prevent the rotation of the plate by more than a predetermined angle, and the plate having a through hole through which the bolt passes; a nut provided at a position corresponding to the through hole of the anti-rotation plate; A receiving frame for a gutter cover, comprising:

2. The gutter cover receiving frame according to claim 1 , wherein two of the side surfaces of the box-shaped member are openings.

3. A receiving frame for a gutter cover as described in claim 1 or 2, wherein the nut protrudes from the upper surface of the anti-rotation plate and the diameter of the upper hole is larger than the diameter of the nut, so that when the gutter cover is fixed with the bolt, the anti-rotation plate is suspended between the upper plate and the lower plate, and when the nut structure is placed upside down and the gutter cover is fixed with the bolt, the anti-rotation plate is pressed against the lower plate.

4. A receiving frame for a gutter cover as described in claim 1 or 2, wherein the protruding dimension of the nut from the anti-rotation plate is configured to be smaller than the thicknesses of the upper plate and the lower plate and the diameter of the upper hole is configured to be larger than the diameter of the nut, so that when the nut structure is positioned face up and upside down and the gutter cover is fixed with the bolt, the anti-rotation plate is pressed against the upper plate or the lower plate.

5. A receiving frame for a gutter cover as described in any one of claims 1 to 4, wherein the positions of the upper hole and the lower hole are away from the center of the upper plate and the lower plate, and different bolt positions can be accommodated by flipping the box-shaped member over or changing the side of the box-shaped member that is joined to the inner vertical surface.

6. A groove cover receiving frame as claimed in any one of claims 1 to 5, further comprising a reinforcing rib on the underside of the lower plate or the upper plate which is positioned lower, the reinforcing rib being adapted to abut against the inner surface of the groove.

7. A method for constructing a gutter cover using the gutter cover frame according to any one of claims 1 to 6, A frame manufacturing process for first manufacturing the frame for the gutter cover; A frame installation process for installing the groove cover frame at an installation location; A groove cover manufacturing process for manufacturing the groove cover after the frame manufacturing process; a gutter cover installation process for installing the gutter cover on the gutter cover receiving frame and fixing it with the bolts; A method for constructing a trench cover, comprising:

8. A method for constructing a gutter cover using the gutter cover frame according to claim 3, A frame manufacturing process for manufacturing the groove cover frame by placing the nut structure portion facing outward; A frame installation process for installing the groove cover frame at an installation location; A groove cover manufacturing process for manufacturing the groove cover; a gutter cover installation process for installing the gutter cover on the gutter cover receiving frame and fixing it with the bolts; a position adjustment step of adjusting the position of the groove cover by an amount of play between the nut and the upper hole as necessary after the groove cover is fixed with the bolt; A method for constructing a trench cover, comprising:

9. A method for constructing a gutter cover using the gutter cover frame according to claim 3, A frame manufacturing process for manufacturing the groove cover frame by placing the nut structure upside down; A frame installation process for installing the groove cover frame at an installation location; A groove cover manufacturing process for manufacturing the groove cover; a gutter cover installation process for installing the gutter cover on the gutter cover receiving frame and fixing it with the bolts; A method for constructing a trench cover, comprising:

10. A method of constructing a gutter cover by using an existing frame to manufacture a gutter cover frame according to any one of claims 1 to 6, and using the gutter cover frame, A gutter cover manufacturing process for manufacturing new gutter covers; A removal process to remove the old gutter cover; A frame manufacturing process for manufacturing the groove cover frame according to any one of claims 1 to 6 by joining the nut structure part to an inner vertical surface of an existing frame; A gutter cover installation process in which a new gutter cover is installed in the gutter cover receiving frame and secured with bolts; A method for constructing a trench cover, comprising:

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