JP2023176246A - Drain channel unit - Google Patents

Abstract

To provide a drain channel unit capable of enhancing the anti-theft effect of a grating while simplifying a structure of the grating.SOLUTION: A grating 13 of a side ditch unit is installed by placing a pair of cylindrical raising stands 22 fixed to a lower surface of a grating body 21 on a lid receiving portion of each side wall of a concrete block. The concrete block is provided with a bolt that protrudes upward from the lid receiving portion, and a lower plate portion 22b of the raising stand 22 is provided with a bolt insertion hole 33. The bolt has a shaft portion extending upward from the lid receiving portion, and a flange at a tip side of the shaft portion. The bolt insertion hole 33 has a first region 33a through which the flange can be inserted, and a second region 33b which extends from the first region 33a in a groove length direction and is formed with a width that allows the shaft portion to be inserted but prevents the flange from being inserted. The grating 13 is installed with the shaft portion inserted through the second region 33b, and the flange is arranged inside the raising stand 22.SELECTED DRAWING: Figure 5

Description

The present invention relates to a drainage channel unit.

Generally, drainage channels such as side gutters for discharging wastewater are formed using concrete blocks. The concrete block is formed to have a U-shaped cross section, for example, and has a pair of side walls facing each other with a drainage channel in between. These side walls have a step-shaped upper inner surface to form a lid receiving part.

A concrete cover or grating will be installed on the concrete block to cover the drainage channel from above. These concrete lids and gratings are installed by placing both ends in the width direction on the lid receiving parts of each side wall.

As shown in Patent Document 1, some gratings include a grating body in the form of a lattice panel and a pair of raised stands fixed to both widthwise ends of the lower surface of the grating body. The raising platform is made of a rectangular cylindrical elongated member extending in the length direction of the drainage channel (hereinafter referred to as the channel length direction). The grating having such a configuration is installed by placing each raising platform on the lid receiving portion of each side wall portion.

Patent Document 1 discloses an anti-theft structure for preventing the grating from being stolen. In this anti-theft structure, projecting pieces projecting from the grating are provided at both ends of the lower surface of the grating in the lengthwise direction of the water channel, and these projecting pieces are arranged on the lower surface side of the concrete lid adjacent to the grating. According to this structure, when attempting to lift the grating upward, each protruding piece gets caught on the concrete lid, making it impossible to lift the grating upward any further. Therefore, it is possible to prevent the grating from being stolen.

Utility model registration No. 3133644

However, in the anti-theft structure of Patent Document 1, it is necessary to separately provide a plurality of protruding pieces on the grating, resulting in a complicated configuration. Furthermore, there is a risk that the protruding piece may be illegally accessed through the gap between the grating and the concrete lid, and there is still room for improvement in preventing grating theft.

The present invention has been made in view of the above circumstances, and its main object is to provide a drainage channel unit that can increase the anti-theft effect of the grating while simplifying the structure of the grating.

In order to solve the above problems, a drainage channel unit of a first invention forms a groove-shaped drainage channel, and includes a concrete block having a pair of side walls facing each other across the drainage channel, and a concrete block having a pair of side walls facing each other with the drainage channel in between. a grating provided to cover from above, a lid receiving part is formed at the upper part of each side wall part by making the inner surface of the side wall part step-shaped, and the grating includes: It has a grating body in the form of a lattice panel, and a pair of cylindrical raising stands fixed to both ends in the width direction of the drainage channel on the lower surface of the grating body and extending in the length direction of the drainage channel, A drainage channel unit in which the grating is installed by placing a raised platform on the lid receiving portion of each side wall portion, wherein the concrete block has a raised base that protrudes upward from the lid receiving portion. A protruding portion is provided, and an insertion hole extending in the length direction and into which the protruding portion is inserted is provided in the mounting plate portion of the raising base that is placed on the lid receiving portion, and the protruding portion is , a first portion extending upward from the lid receiving portion and inserted into the insertion hole; and a first portion provided on the distal end side of the first portion and disposed inside the raising base, and a first portion extending upward from the lid receiving portion and inserted into the insertion hole; a second portion having a length longer than the first portion, and the insertion hole has a first region formed in a size that allows the second portion to be inserted therethrough; a second region extending from the region in the length direction and having a width dimension that allows the first portion to be inserted and prevents the second portion from being inserted; The grating is installed with the first portion inserted into the second region.

According to the first invention, the concrete block is provided with a protrusion that protrudes upward from the lid receiving part. In addition, a mounting plate portion of the grating raising base that is placed on the lid receiving portion is provided with an insertion hole through which the protruding portion is inserted. The protruding part has a first part extending upward from the lid receiving part and a second part provided on the distal end side of the first part, the first part being inserted into the insertion hole and the second part being a raised part. It is said that it can be placed inside. Further, the second portion has a longer length in the width direction of the drainage channel than the first portion.

The insertion hole has a first region into which the second portion of the protrusion can be inserted, and a second region extending from the first region in the length direction of the drainage channel (hereinafter referred to as the channel length direction). The second region is formed to have a width dimension that allows the first portion of the protrusion to be inserted therethrough and prevents the second portion from being inserted therethrough. The grating is installed with the first portion of the protrusion inserted into the second region of the insertion hole.

In such a configuration, when an attempt is made to lift the grating upward, the mounting plate portion of the raising table gets caught on the second portion of the protrusion, making it impossible to lift the grating upward any further. Further, since the second portion is disposed inside the raising table, it is difficult to see where it is caught, and therefore, it is extremely difficult to gain unauthorized access to the caught place. Thereby, the anti-theft effect of the grating can be enhanced.

Further, since the second portion of the protrusion is configured to be caught on the raised base (specifically, the mounting plate portion) of the grating, there is no need to separately provide a member for catching on the grating side. Therefore, the anti-theft effect of the grating can be enhanced while simplifying the structure of the grating.

Here, in the above configuration, when installing the grating on the concrete block, first, pass the second part of the protrusion through the first region of the insertion hole provided in the raising base, and then attach each raising base to the concrete block. Place it on the lid holder. As a result, the grating is placed on the lid receiver with the first portion of the protrusion inserted into the first region of the insertion hole. Thereafter, in this placed state, by sliding the grating in the length direction of the waterway, the first portion of the protrusion is inserted into the second region from the first region of the insertion hole. Thereby, the grating is installed at a predetermined installation position.

Also, when removing the grating, follow the steps in the reverse order of when installing the grating. When removing the grating, first, by sliding the grating in the opposite direction to the installation, the first portion of the protrusion enters the first region from the second region of the insertion hole. Thereafter, by lifting the grating upward, the grating is removed while passing the second portion of the protrusion through the first region.

In the drainage channel unit of a second invention, in the first invention, a first marker provided on the concrete block is used as a marker indicating the relative positional relationship in the length direction between the protrusion and the first region. , a second marker provided on the grating, and the first marker and the second marker are arranged at positions that are visible from above the drainage channel unit.

In the configuration of the first invention described above, the insertion hole formed in the raising base (placing plate part) of the grating and the protrusion inserted into the insertion hole are covered from above by the raising base. It is considered that it becomes difficult to grasp the relative positional relationship between the protrusion (second portion) and the first region of the insertion hole from above the drain channel unit. Therefore, when installing or removing the grating while passing the second portion of the protrusion through the first region, it is assumed that the work becomes difficult.

Therefore, in the second invention, in view of this point, a first marker is provided on the concrete block provided with the protrusion, a second marker is provided on the grating provided with the insertion hole, and each marker is used to determine the length of the waterway. The relative positional relationship between the protrusion and the first region in the direction is shown. These markers are placed in positions that are visible from above the drainage channel unit, so when removing or installing the grating, it is possible to align the first area with the protrusion while looking at these markers. It becomes possible. Therefore, when removing or installing the grating while passing the second portion of the protrusion through the first region, it becomes possible to facilitate the work.

In the drainage channel unit of a third invention, in the second invention, when the protrusion and the first region are at the same position in the length direction, the first marker and the second marker are arranged in the length direction. The positions of these markers are set so that they are located at the same position in the direction.

According to the third invention, by positioning the second marker provided on the grating at the same position in the length direction of the waterway as the first marker provided on the concrete block, the first region of the insertion hole is formed into a protrusion. (the second portion) can be aligned at the same position in the length direction of the waterway. Thereby, the first region can be easily aligned with the protrusion.

In the drainage channel unit of a fourth invention, in the second invention, when the protrusion is inserted into the first region, the first marker and the second marker are located at the same position in the longitudinal direction. and the position of each marker is set so that when the protrusion is inserted into the second region, the first marker and the second marker are located at different positions in the length direction. There is.

According to the fourth invention, when the first marker and the second marker are at the same position in the length direction of the waterway, the protrusion is inserted into the first region of the insertion hole. Therefore, in this case, it is possible to lift the grating upward while passing the second portion of the protrusion through the first region. Further, when the first marker and the second marker are at different positions in the length direction of the waterway, the protrusion is inserted into the second region of the insertion hole. Therefore, in this case, it becomes impossible to lift the grating upward. Therefore, according to the above configuration, it is possible to easily determine whether or not the grating can be removed, depending on whether the positions of the respective markers are the same or different.

In the drainage channel unit according to a fifth aspect of the invention, in any one of the second to fourth aspects, the raising table has an upper plate part that vertically faces the placing plate part, and the first marker is The second marker is provided on an upper end surface of the side wall portion that is outside the lid receiving portion in the width direction, and the second marker is placed on the lid receiving portion of the side wall portion where the first marker is provided. It is provided on the upper plate portion of the raised base.

According to the fifth invention, when the first marker and the second marker are viewed from above, these markers are close to each other, so it is easy to understand the positional relationship between the markers. Therefore, it can be said that this is a suitable configuration for understanding the positional relationship between the first region and the protrusion using these markers.

Furthermore, since the second marker is located below the grating body, it is difficult to notice it at first glance. Therefore, even though both markers are close to each other, it is possible to reduce the possibility that the presence of both markers will be noticed and an illegal act will be performed.

In the drainage channel unit of a sixth invention, in the fifth invention, the grating main body includes a plurality of main bars extending in the width direction and a plurality of cross bars extending in the length direction and intersecting each of the main bars. The second marker is located between the adjacent main bars when viewed from above the grating.

In the configuration of the fifth invention in which the second marker is provided on the upper surface of the raised base of the grating, it is necessary to visually recognize the second marker through the grid-like grating body. In this regard, in the sixth aspect of the invention, in such a configuration, the second marker is located between adjacent main bars when viewed from above the grating (the grating main body). Therefore, even with this configuration, the second marker can be easily seen.

In the drainage channel unit according to a seventh aspect of the invention, in the sixth aspect, the second marker is arranged to be vertically aligned with the first area.

According to the seventh invention, since the second marker is vertically aligned with the first region of the insertion hole, the position of the first region can be determined by the second marker. In this case, when removing or installing the grating while passing the second part of the protrusion through the first area, the work can be done while grasping the place where the second part will pass, making the work easier. be able to.

In the drainage channel unit according to an eighth aspect of the invention, in the seventh aspect, the second marker includes a hole that penetrates the upper plate portion in the thickness direction.

According to the eighth invention, when removing or installing the grating, the second portion of the protrusion can be visually recognized through the hole (second marker). Therefore, the work of removing and installing the grating can be made easier.

A plan view showing a side gutter unit. FIG. 2 is a sectional view taken along line AA in FIG. 1. (a) is a plan view showing a part of the concrete block, and (b) is a sectional view taken along the line BB in (a). (a) is a plan view showing the grating, (b) is a bottom view, and (c) is a side view. A perspective view of the grating seen from below. FIG. 7 is a cross-sectional view showing a state in which a bolt is inserted into a second region of the insertion hole. (a) is a plan view showing a state in which the grating has been slid to a removable position, and (b) is a cross-sectional view showing a state in which a bolt is inserted into a first region of an insertion hole. (a) is a top view showing a gutter unit in another embodiment, and (b) is a cross-sectional view showing a state in which a bolt is inserted into the second region of the insertion hole.

An embodiment embodying the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the gutter unit 10 includes a concrete block 11 forming a gutter 15, a concrete cover 12 and a grating 13 that cover the gutter 15 from above. The concrete lid 12 and the grating 13 are arranged side by side in the direction in which the side gutter 15 extends (hereinafter referred to as the gutter length direction). The concrete lids 12 are arranged on both sides of the grating 13 in the groove length direction.

Note that the gutter unit 10 corresponds to a "drain channel unit" and the gutter 15 corresponds to a "drain channel." Further, the groove length direction corresponds to the "length direction of the drainage channel".

As shown in FIGS. 3A and 3B, the concrete block 11 is formed to have a U-shaped cross section, and has a side gutter 15 in which drainage water flows. The concrete block 11 has a pair of side wall portions 16 facing each other with a gutter 15 in between, and a bottom plate portion 17 connecting the lower portions of each side wall portion 16. A lid receiving part 18 is formed at the upper part of each side wall part 16 by making the inner surface of the side wall part 16 step-shaped. The lid receiving portion 18 extends along the length direction of the groove.

The concrete lid 12 is formed into a rectangular plate shape. The concrete lid 12 is installed by placing both ends in the width direction of the side gutter 15 (hereinafter referred to as the groove width direction) on the lid receiving portions 18 of each side wall portion 16 of the concrete block 11 (Fig. 7 (see also (a)). Further, the concrete lid 12 has a concave handle portion 19 formed on one side extending in the groove width direction. Note that the groove width direction corresponds to the "width direction of the drainage channel."

As shown in FIGS. 4(a) to 4(c) and FIG. 5, the grating 13 is made of metal and includes a grating body 21 shaped like a lattice panel and a pair of raising bases 22. The grating body 21 has a rectangular shape and includes a main bar 24, a cross bar 25, and an end plate 26.

The main bar 24 is a long member with an I-shaped cross section extending in the groove width direction. A plurality of main bars 24 are arranged at predetermined intervals in the groove length direction. The cross bar 25 is formed by twisting each bar, and extends in the groove length direction. The cross bars 25 span the upper part of each main bar 24, and a plurality of cross bars 25 are arranged at predetermined intervals in the groove width direction. Further, each cross bar 25 intersects with the main bar 24, and is fixed to the main bar 24 at the intersecting portion by welding. The end plates 26 are strip-shaped long plates extending in the groove length direction, and are disposed at both ends of each main bar 24 . The end plate 26 spans the end of each main bar 24 and is fixed to the end of each main bar 24 by welding.

The raising base 22 is formed into a square tube shape extending in the groove length direction. The raising bases 22 are fixed to both ends of the lower surface of the grating body 21 in the groove width direction, and extend over substantially the entire length of the grating body 21 in the groove length direction. The raising table 22 has an upper plate part 22a and a lower plate part 22b that face each other in the vertical direction, and a pair of side plate parts 22c that face each other in the groove width direction (see also FIG. 2). The upper plate portion 22a is fixed to the lower surface of the grating body 21, and more specifically, to the lower surface of each main bar 24 by welding.

As shown in FIG. 2, each raising platform 22 is placed on the lid receiving portion 18 of each side wall portion 16 of the concrete block 11, and the grating 13 is installed in this placed state. In this case, the lower plate portion 22b of the raising table 22 is placed on the lid receiving portion 18, and the lower plate portion 22b corresponds to a “placing plate portion”. Further, in the installed state of the grating 13, the upper surface of the grating 13 and the upper end surface 16a of the side wall portion 16 of the concrete block 11 are located at the same height.

Here, the main gutter unit 10 is provided with an anti-theft structure for preventing the grating 13 from being stolen. The anti-theft structure will be explained below.

As shown in FIGS. 3A and 3B, bolts 31 are provided on each side wall portion 16 of the concrete block 11 in a state that projects upward from the lid receiving portion 18. As shown in FIGS. These bolts 31 are arranged at the same position in the groove length direction. The bolt 31 is made of a metal flange bolt (hexagonal bolt with a flange), and includes a shaft portion 31a, a head portion 31b provided on the tip side of the shaft portion 31a, and a flange 31c provided on the bottom surface of the head portion 31b. have. The shaft portion 31a extends in the vertical direction, and its lower end side is buried inside the concrete block 11. Thereby, the bolt 31 is attached to the concrete block 11.

The flange 31c has a disk shape and is integrated with the head 31b. The flange 31c protrudes outward in the radial direction from the head 31b, and is the largest diameter portion of the bolt 31 having the largest radial dimension. When the bolt 31 is attached to the concrete block 11, a predetermined gap is formed between the flange 31c and the lid receiving part 18. The dimension of this gap is larger than the thickness of the lower plate portion 22b of the raising table 22.

Note that the bolt 31 corresponds to a "projection", the shaft part 31a corresponds to a "first part", and the flange 31c corresponds to a "second part". Further, when the diameter of the shaft portion 31a is D1 and the diameter of the flange 31c is D2, D1<D2. The diameter D2 of the flange 31c can be said to be the length of the flange 31c in the groove width direction, and therefore, D2 corresponds to "the length in the width direction of the drainage channel in the second portion."

As shown in FIGS. 4(b) and 5, each raising base 22 of the grating 13 has an insertion hole 33 formed in its lower plate portion 22b, into which a bolt 31 is inserted. Each insertion hole 33 is arranged approximately at the center of the raising table 22 in the longitudinal direction. The insertion hole 33 extends in the longitudinal direction of the raising base 22, or in other words, extends in the groove length direction. Note that only one insertion hole 33 is provided in each raising base 22.

The insertion hole 33 has a circular first region 33a and a long hole-shaped second region 33b extending in the longitudinal direction of the raising table 22 from the first region 33a. The diameter D3 (see FIG. 6) of the first region 33a is larger than the diameter D2 of the flange 31c of the bolt 31. Therefore, the flange 31c of the bolt 31 can be inserted into the first region 33a, and the entire bolt 31 can be inserted thereinto.

The second region 33b extends from the first region 33a to one side in the longitudinal direction of the raising base 22 (in other words, the groove length direction). The width W (specifically, the length in the groove width direction) of the second region 33b is smaller than the diameter D3 of the first region 33a. Further, the width W of the second region 33b is larger than the diameter D1 of the shaft portion 31a of the bolt 31, and smaller than the diameter D2 of the flange 31c of the bolt 31. Therefore, while the shaft portion 31a of the bolt 31 can be inserted into the second region 33b, the flange 31c of the bolt 31 cannot be inserted therethrough. Further, the length of the second region 33b (specifically, the length in the groove length direction) is longer than the diameter D3 of the first region 33a.

As shown in FIGS. 2 and 6, the grating 13 is installed on the lid receiving portion 18 of the concrete block 11, with bolts 31 inserted through the insertion holes 33 of each raising platform 22. In this case, the shaft portion 31a of the bolt 31 is inserted into the insertion hole 33, and the head 31b and flange 31c are arranged inside the raising base 22. Further, the shaft portion 31a of the bolt 31 is inserted into the second region 33b of the insertion hole 33, and more specifically, the shaft portion 31a of the bolt 31 is inserted into the end of the second region 33b on the opposite side to the first region 33a side. In this configuration, when attempting to lift the grating 13 upward, the lower plate portion 22b of the raising table 22 gets caught on the flange 31c of the bolt 31, making it impossible to lift the grating 13 upward any further. Therefore, it is possible to prevent the grating 13 from being stolen.

Next, the procedure for removing the grating 13 from the concrete block 11 will be explained based on FIG. 7.

When removing the grating 13, first, as shown in FIGS. 7(a) and 7(b), by sliding the grating 13 in the groove length direction, the shaft portion 31a of the bolt 31 is inserted into the second region of the insertion hole 33. 33b into the first region 33a. Thereby, the bolt 31 is inserted into the first region 33a. In addition, when sliding the grating 13, the concrete cover 12 on the sliding side is removed in advance.

Subsequently, the grating 13 is lifted upward and removed. As described above, the diameter D3 of the first region 33a is larger than the diameter D2 of the flange 31c of the bolt 31, so at this time, the grating 13 is lifted upward while passing the flange 31c through the first region 33a. Remove.

Next, a procedure for installing grating 13 on concrete block 11 will be described. When installing the grating 13, the steps for removing the grating 13 are reversed. First, the grating 13 is placed on each lid receiving portion 18 of the concrete block 11 while passing the flange 31c of the bolt 31 through the first region 33a of the insertion hole 33. As a result, the grating 13 is placed on each lid receiving portion 18 with the bolt 31 (shaft portion 31a) inserted into the first region 33a (the state shown in FIG. 7(b)). Thereafter, by sliding the grating 13 in the groove length direction in the opposite direction to the direction in which it was removed, the shaft portion 31a of the bolt 31 is inserted into the second region 33b from the first region 33a of the insertion hole 33. Thereby, the grating 13 is installed at a predetermined installation position (see FIG. 1) with the shaft portion 31a of the bolt 31 inserted into the second region 33b (the state shown in FIG. 6).

Note that when the grating 13 is installed at a predetermined installation position, it is assumed that a slight gap exists between the grating 13 and the adjacent concrete lid 12. Therefore, the sliding distance when the grating 13 is slid from the (removable) position shown in FIG. 7(a) to the predetermined installation position shown in FIG. 1 is set to a distance that is sufficiently longer than the above-mentioned gap. Therefore, the length of the second region 33b of the insertion hole 33 (specifically, the length in the groove length direction) that enables the sliding thereof is also sufficiently longer than the above-mentioned gap.

Here, in the above-described anti-theft structure, since the bolts 31 and the insertion holes 33 are covered from above by the raising base 22 (more specifically, the upper plate part 22a), when installing or removing the grating 13, the bolts 31 and the insertion holes 33 are 31 (flange 31c) and the first region 33a of the insertion hole 33 may be difficult to grasp from above the side gutter unit 10. Therefore, when installing or removing the grating 13, it is assumed that the work will be difficult. Therefore, in this gutter unit 10, in consideration of this point, markers 35 and 36 are provided at positions that can be seen from above of the gutter unit 10 to indicate the relative positional relationship in the groove length direction between the bolt 31 and the first region 33a. ing. The markers 35 and 36 will be explained below.

As shown in FIGS. 1, 3(a), and 4(a), the markers 35 and 36 include a first marker 35 provided on the concrete block 11 and a second marker 36 provided on the grating 13. There is. The first marker 35 is provided on the upper end surface 16a of each side wall portion 16 of the concrete block 11. Each first marker 35 is arranged at the same position in the groove length direction. The first marker 35 is a triangular recess formed in the upper end surface 16a of the side wall portion 16, with one top of the triangle facing inward in the groove width direction.

The second marker 36 is provided on the upper plate portion 22a of each raising table 22 of the grating 13. Each of the second markers 36 is arranged approximately at the center of the grating 13 in the groove length direction, and is located at the same position as each other in the same direction. The second marker 36 consists of a triangular hole formed in the upper plate portion 22a of the raising table 22. The hole (second marker 36) passes through the upper plate portion 22a in the thickness direction, and one triangular top thereof faces outward in the groove width direction. Further, the second marker 36 has approximately the same size as the first marker 35.

The second marker 36 is located between adjacent main bars 24 of the grating body 21 when viewed from above the grating 13. Specifically, the second marker 36 is located between the adjacent main bars 24 and between the adjacent cross bars 25 and end plates 26 when viewed from above the grating 13. Further, the second marker 36 is located directly above the first region 33a of the insertion hole 33. Therefore, the second marker 36 and the first region 33a are aligned in the vertical direction.

As shown in FIG. 1, when the grating 13 is installed at a predetermined installation position, the first marker 35 and the second marker 36 are at different positions in the groove length direction. In other words, when the bolt 31 (shaft portion 31a) is inserted into the second region 33b of the insertion hole 33 (the state shown in FIG. 6), the markers 35 and 36 are at different positions in the groove length direction. . On the other hand, as shown in FIG. 7(a), the grating 13 is slid from the predetermined installation position and the bolt 31 is inserted into the first region 33a of the insertion hole 33 (the state shown in FIG. 7(b) ), each marker 35, 36 is located at the same position in the groove length direction.

According to such a configuration, when the markers 35 and 36 are at the same position in the groove length direction, the bolt 31 is inserted into the first region 33a of the insertion hole 33. Therefore, in this case, it is possible to lift the grating 13 upward while passing the flange 31c of the bolt 31 through the first region 33a. Further, when the markers 35 and 36 are at different positions in the groove length direction, the bolt 31 is inserted into the second region 33b of the insertion hole 33, so in this case, the grating 13 is lifted upward. becomes impossible. Therefore, with this configuration, it is possible to easily determine whether or not the grating 13 can be removed, depending on whether the positions of the markers 35 and 36 are the same or different.

According to the configuration of this embodiment described in detail above, the following excellent effects can be obtained.

Since the markers 35 and 36 indicating the relative positional relationship in the groove length direction between the bolt 31 and the first region 33a of the insertion hole 33 are arranged in a position that can be seen from above the side gutter unit 10, removal or installation of the grating 13 is easy. When doing so, it is possible to align the first region 33a with the bolt 31 while looking at these markers 35 and 36. Therefore, when removing or installing the grating 13 while passing the flange 31c of the bolt 31 through the first region 33a, it is possible to facilitate the work.

The positions of the markers 35 and 36 were set so that when the bolt 31 and the first region 33a are located at the same position in the groove length direction, the markers 35 and 36 are located at the same position in the groove length direction. In this case, by positioning the second marker 36 on the grating 13 side at the same position as the first marker 35 on the concrete block 11 side in the groove length direction, the first region 33a is aligned with the bolt 31 (flange 31c) and the groove length. They can be aligned to the same position in both directions. Thereby, the first region 33a can be easily aligned with the bolt 31.

The first marker 35 is provided on the upper end surface 16a of the side wall portion 16 of the concrete block 11, and the second marker 36 is provided on the upper plate portion 22a of the raising base 22 of the grating 13. In this case, when these markers 35, 36 are viewed from above, the markers 35, 36 are close to each other, so the positional relationship between the markers 35, 36 is easy to understand. Therefore, it can be said that this is a suitable configuration for understanding the positional relationship between the first region 33a of the insertion hole 33 and the bolt 31 using these markers 35 and 36.

Furthermore, since the second marker 36 is located below the grating body 21, it is difficult to notice it at first glance. Therefore, even though the markers 35 and 36 are close to each other, it is possible to reduce the possibility that the presence of the markers 35 and 36 will be noticed and a fraudulent act will be performed.

Since the second marker 36 is located between the adjacent main bars 24 when viewed from above the grating 13, even if the second marker 36 is visually recognized through the grid-like grating body 21, the second marker 36 is 2 marker 36 can be made easier to see.

Furthermore, since the second marker 36 is located between the adjacent crossbar 25 and end plate 26 when viewed from above the grating 13, the second marker 36 can be more easily seen.

Since the second marker 36 is vertically aligned with the first region 33a of the insertion hole 33, the position of the first region 33a can be determined by the second marker 36. In this case, when removing or installing the grating 13 while passing the flange 31c of the bolt 31 through the first region 33a, the work can be done while grasping the location where the flange 31c will pass, making the work easier. be able to.

The second marker 36 consists of a hole that penetrates the upper plate portion 22a of the raising table 22 in the thickness direction. In this case, when removing or installing the grating 13, it becomes possible to visually recognize the flange 31c of the bolt 31 through the hole (second marker 36). Therefore, the work of removing and installing the grating 13 can be made easier.

According to the anti-theft structure of the above embodiment, when removing the grating 13, it is necessary to first remove the adjacent concrete cover 12 and then slide the grating 13 in the groove length direction. In other words, it is necessary to perform two operations before removing the grating 13: removing the concrete cover 12 and sliding the grating 13. Therefore, the structure requires a great deal of effort to remove the grating 13, and therefore, the anti-theft effect can be enhanced in this respect as well.

The present invention is not limited to the above embodiments, and may be implemented, for example, as follows.

- The shapes of the first marker 35 and the second marker 36 do not necessarily have to be triangular, and may be other shapes such as circular or square. Further, the shapes and sizes of the markers 35 and 36 do not necessarily have to be the same, and may be different.

- Instead of forming the first marker 35 with a concave portion, it may be formed with a convex portion. Alternatively, the first marker 35 may be formed by coloring the upper end surface 16a of the side wall portion 16 of the concrete block 11 in a color different from that of the concrete block 11, such as black. Alternatively, a marker member may be attached to the upper end surface 16a of the side wall portion 16, and this member may be used as the first marker 35.

- The first marker 35 may be provided on the inner surface of the side wall section 16 (specifically, on the inner surface located below the lid receiving section 18) instead of on the upper end surface 16a of the side wall section 16. In that case, the first marker 35 will be visually recognized through the grating 13.

- The second marker 36 does not necessarily have to be a hole. For example, a concave portion or a convex portion may be formed on the upper surface of the upper plate portion 22a of the raising table 22, and the concave portion or convex portion may be used as the second marker 36. Further, the second marker 36 may be formed by coloring the upper surface of the upper plate portion 22a in a color different from that of the raising base 22, such as black. Alternatively, a marker member may be attached to the upper surface of the upper plate portion 22a, and this member may be used as the second marker 36.

- The second marker 36 may be provided on the side surface of the raising base 22 instead of on the upper surface of the raising base 22 (upper plate portion 22a). Further, the second marker 36 may be provided on the grating body 21.

- In addition to the first marker 35, a third marker is provided on the concrete block 11, and when the bolt 31 (shaft portion 31a) is inserted into the second region 33b of the insertion hole 33, the second marker 36 and the third marker may be located at the same position in the groove length direction. In that case, when sliding the grating 13 and installing it at a predetermined installation position, the second marker 36 can be easily installed by aligning it with the third marker.

- In the above embodiment, the markers 35 and 36 are provided on both sides in the groove width direction, but they may be provided only on one side. Note that the markers 35 and 36 may not be provided on the gutter unit 10.

- In the above embodiment, the second marker 36 is arranged vertically with the first region 33a of the insertion hole 33, but this is changed so that the second marker 36 is aligned with the groove length relative to the first region 33a. It may be arranged at a position shifted in the direction (longitudinal direction of the raising table 22).

- In the above embodiment, when the first region 33a of the insertion hole 33 is located at the same position as the bolt 31 in the groove length direction, each marker 35, 36 is positioned at the same position in the groove length direction. However, by changing this, when the first region 33a of the insertion hole 33 is at the same position as the bolt 31 in the groove length direction, each marker 35, 36 is set at a predetermined distance (for example, 3 cm) in the groove length direction. ) may be set apart. Also in this case, it is possible to align the first region 33a with the bolt 31 by separating the markers 35 and 36 by the predetermined distance in the groove length direction.

- The insertion hole 33 does not necessarily need to be provided in the center of the raising table 22 in the longitudinal direction. For example, the insertion holes 33 may be provided at both ends of the raising base 22 in the longitudinal direction. In this case, it is necessary to provide bolts 31 on the concrete block 11 at positions corresponding to the respective insertion holes 33.

- The insertion hole 33 may be provided only in one of the raising bases 22 of the grating 13. In this case, correspondingly, the bolts 31 are provided only on one of the side walls 16 of the concrete block 11. Even with such a configuration, when the grating 13 is lifted, one of the raising stands 22 gets caught on the flange 31c of the bolt 31, so it is possible to prevent theft.

- It is not always necessary to use the bolt 31 as the protrusion, and a member other than the bolt 31 may be used. For example, it is conceivable to use a pin member having a head (tip) with an enlarged diameter. In this case, in the pin member, the portion other than the head portion (the portion whose diameter is not expanded) corresponds to the first portion, and the head portion corresponds to the second portion. Alternatively, a convex portion that protrudes upward from the lid receiving portion 18 may be formed on the concrete block 11, and the convex portion may be used as a protruding portion. In this case, the protrusion will be made of concrete.

- In the above embodiment, the raising table 22 has a square tube shape with a square cross section (rectangular or square shape), but the cross section of the raising table 22 may have a trapezoidal shape or an elliptical shape, for example. Regardless of the cross-sectional shape, an insertion hole may be formed in the mounting plate portion of the raising table 22 that is placed on the lid receiving portion 18.

- In the above embodiment, the concrete block 11 has a U-shaped cross section, but for example, the concrete block may be a variable gutter with an inverted U-shaped cross section. An example of that case is shown in FIG. 8(a). The concrete block 41 of the gutter unit 40 shown in FIG. 43 is formed with an opening 45 extending in the longitudinal direction of the groove. In this opening 45, a concrete cover 12 and a grating 13 are installed side by side in the groove length direction. Also in this case, the concrete lid 12 and the grating 13 are placed on the lid receiving portion of each side wall portion 42. Even in such a configuration, similarly to the above embodiment, the side wall portion 42 of the concrete block 41 is provided with a bolt 31 that protrudes upward from the lid receiving portion, and the raising base 22 of the grating 13 is provided with an insertion hole 33. Thus, the anti-theft structure of the grating 13 can be realized (see FIG. 6).

- By the way, in the example shown in FIG. 8(a), the concrete cover 12 is placed on the left side of the figure, and the grating 13 is placed on the right side of the figure, but conversely, the concrete cover 12 is placed on the right side of the figure. It is also assumed that the grating 13 is placed on the left side of the drawing. In that case, when removing the grating 13, it is necessary to slide the grating 13 to the right side in the figure, and when installing the grating 13 at a predetermined installation position, slide the grating 13 from the right side to the predetermined installation position. It is necessary to install it at the relevant installation position.

However, the insertion hole 33 of the above embodiment (see FIG. 6, etc.) allows the grating 13 to slide only to the left in the figure with respect to a predetermined installation position. It is not possible to remove the grating 13 by sliding it to the right in the figure with respect to the installation position, or to install the grating 13 at a predetermined installation position by sliding it from the right side. Therefore, in view of this point, it is conceivable to make the shape of the insertion hole as shown in FIG. 8(b). The insertion hole 51 shown in FIG. 8(b) has a first region 51a and a pair of second regions 51b extending from the first region 51a in opposite directions in the groove length direction. That is, in this insertion hole 51, one second region 51b extends from the first region 51a to the left side in the figure, and the other second region 51b extends from the first region 51a to the right side in the figure. Therefore, if such an insertion hole 51 is used, the grating 13 can be slid to the left side or the right side in the figure with respect to a predetermined installation position. Therefore, regardless of the horizontal positional relationship between the concrete lid 12 and the grating 13, the grating 13 can be installed and removed.

- In the above embodiment, the concrete cover 12 was installed adjacent to the grating 13, but another grating may be installed adjacent to the grating 13. The present invention can also be applied to such cases.

- In the above embodiment, the present invention was applied to the side gutter unit 10 (corresponding to a drain unit) that forms the side gutter 15, but the present invention may be applied to a drain unit that forms a drain other than the side gutter 15. .

DESCRIPTION OF SYMBOLS 10... Side gutter unit as a drainage channel unit, 11... Concrete block, 12... Concrete cover, 13... Grating, 21... Grating main body, 22... Raising stand, 31... Bolt as a protruding part, 31a... Shaft as a first part 31c...flange as a second part, 33...insertion hole, 33a...first region, 33b...second region, 35...first marker, 36...second marker.

Claims (8)

A concrete block that forms a groove-shaped drainage channel and has a pair of side walls facing each other with the drainage channel in between;
A grating provided to cover the drainage channel from above,
A lid receiving part is formed at the upper part of each of the side wall parts by making the inner surface of the side wall part step-shaped,
The grating is
A grating body in the form of a lattice panel,
a pair of cylindrical elevating bases fixed to both widthwise ends of the drainage channel on the lower surface of the grating body and extending in the length direction of the drainage channel;
A drainage channel unit in which the grating is installed by placing the pair of raised stands on the lid receiving portions of each of the side walls,
The concrete block is provided with a protrusion that protrudes upward from the lid receiver,
An insertion hole extending in the length direction and into which the protrusion is inserted is provided in the mounting plate part of the raising table that is placed on the lid receiving part,
The protruding portion is
a first portion extending upward from the lid receiving portion and being inserted into the insertion hole;
a second portion that is provided on the distal end side of the first portion and can be placed inside the raising table, and has a length in the width direction that is longer than the first portion; ,
The insertion hole is
a first region formed in a size that allows the second portion to be inserted therethrough;
a second region extending in the length direction from the first region and having a width dimension that allows the first portion to be inserted and prevents the second portion from being inserted; Ori,
The grating is a drainage channel unit installed with the first portion inserted into the second region. A first marker provided on the concrete block and a second marker provided on the grating as markers indicating the relative positional relationship in the length direction between the protrusion and the first region,
The drain unit according to claim 1, wherein the first marker and the second marker are arranged at positions that are visible from above the drain unit. The positions of the respective markers are set so that when the protrusion and the first region are located at the same position in the length direction, the first marker and the second marker are located at the same position in the length direction. The drainage channel unit according to claim 2, wherein the drainage channel unit is When the protrusion is inserted into the first region, the first marker and the second marker are located at the same position in the length direction, and the protrusion is inserted into the second region. 3. The drainage channel unit according to claim 2, wherein the positions of the first and second markers are set so that in some cases, the first marker and the second marker are located at different positions in the length direction. The elevating table has an upper plate portion that vertically faces the placement plate portion,
The first marker is provided on an upper end surface of the side wall part located outside the lid receiving part in the width direction,
The method according to any one of claims 2 to 4, wherein the second marker is provided on the upper plate portion of the raising table placed on the lid receiving portion of the side wall portion where the first marker is provided. Drain unit as described in Section. The grating main body has a plurality of main bars extending in the width direction and a plurality of cross bars extending in the length direction and intersecting each of the main bars,
The drainage channel unit according to claim 5, wherein the second marker is located between the adjacent main bars when viewed from above the grating. The drainage channel unit according to claim 6, wherein the second marker is arranged to be vertically aligned with the first region. The drainage channel unit according to claim 7, wherein the second marker is a hole that penetrates the upper plate portion in the thickness direction.

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