JP3207875U - Grating retaining mechanism - Google Patents

Abstract

The present invention provides a retaining mechanism for a grating that suppresses the jumping and theft of the grating fitted in the upper surface opening of a concrete block in a side groove or a water channel. In a retaining mechanism in which a retainer 11 is fixed to the front and rear ends of the grating, the grating 1 has a raised base 3 fixed to the left and right ends of the lower surface of the lattice panel 2. The retainer 11 has a stepped shape, and the upper horizontal piece 13 protrudes rearward from the upper end of the vertical piece, and the lower horizontal piece 14 protrudes frontward from the lower end of the vertical piece. The upper horizontal piece 13 was fixed to the lower surface of the lattice panel 2 by welding or the like. The vertical piece protruded from the lower side of the lattice panel 2 and the lower horizontal piece 14 protruded from the front side or the rear side of the lattice panel 2. The grid panel 2 for fixing the upper horizontal piece 13 is fixed in the left-right direction, except for the left and right end portions 22 facing the left and right lid receiving portions of the upper surface opening of the concrete block. It was made into the part 21 other than the left-right direction center part 23 adjacent to. [Selection] Figure 1

Description

  The present invention relates to a retaining technique for suppressing jumping and theft of a grating fitted in an upper surface opening of a concrete block in a side groove or a water channel.

  The side blocks and the concrete blocks of the water channel have U-shaped or inverted U-shaped vertical cross-sections with side walls juxtaposed on the left and right in the width direction. Between the left and right side walls, a water flow path is provided between them, and an opening is provided on the upper surface. The left and right side walls are stepped on the inner side of the upper end portion, and stepped lid receiving portions are provided along the front-rear direction at the left and right ends of the top opening. Some concrete blocks are provided with a beam portion spanned between the upper ends of the left and right side walls. The beam portion is adjacent to the front end or the rear end of the upper surface opening.

  The grating of the metal grid lid and the concrete plate lid are dropped into the top opening of the concrete block. The grating and the concrete plate-like lid are respectively placed on the left and right lid receiving portions of the upper surface opening at the left and right ends. The rectangular grating and the concrete plate-like lid are adjacent to each other in the flow direction of the side groove and the water channel, and the upper surface is arranged in the same plane.

The grating is formed by welding steel materials, and is composed of a lattice panel and a raised base. The square plate-like lattice panel has square bar-shaped raising bases fixed to the left and right ends of the lower surface along the front-rear direction. In the rectangular plate-like lattice panel, end bars are arranged in parallel at the left end and the right end, and a main bar is stretched between the left and right end bars along the left-right direction and fixed. A large number of main bars are arranged at equal intervals in the front-rear direction. Each main bar of the horizontally long rectangular plate has a bar-shaped cross bar passing through and fixed to the upper part thereof in the front-rear direction. Many cross bars are arranged at equal intervals in the left-right direction.
The concrete plate-like lid is formed with a cue recess for lifting at the center in the left-right direction at the front end or rear end.

The grating disclosed in Patent Document 1 is provided with a retaining mechanism that makes it difficult to extract from the top opening of the concrete block in order to prevent theft.
In the first example of the retaining mechanism, as shown in FIG. 1, L-shaped retaining members are fixed to the front and rear ends of the left and right raising bases of the grating, respectively. The L-shaped retainer is formed of a vertical piece and a horizontal piece by bending a steel plate into an L shape. The vertical pieces are fixed to the front end and the rear end of the left and right raising platforms, respectively. The horizontal piece protrudes from the front end or the rear end of the grating to the front side or the rear side. The lower surface of the horizontal piece is disposed in the same plane as the lower surface of the raising base. As shown in FIG. 7, the concrete plate-like lid has notch recesses formed at the left and right corners on the lower surface and the front and rear, respectively. As shown in FIGS. 4 to 6, the grating and the concrete plate-like lid are adjacent to each other in the front-rear direction when dropped into the opening on the top surface of the concrete block. The left and right end portions of the horizontal plate and the concrete plate-like lid are respectively placed on the left and right lid receiving portions of the upper surface opening. The lateral pieces of the L-shaped retaining brackets on the left and right sides of the grating are fitted in the notch recesses on the left and right sides of the concrete plate lid, respectively. In the grating, when a lifting force for extraction is applied, the lateral piece of the L-shaped retaining member hits a notch recess on the lower surface of the concrete plate-like lid and does not rise. If the concrete plate-shaped lid is not removed first, it cannot be pulled out.

  As shown in FIG. 2, the retaining mechanism of the second example fixes the L-shaped retaining device to the ends of the left and right raised platforms at one end of the front end or the rear end of the grating as in the first example. At the other end, a wide L-shaped stopper is fixed at the center in the left-right direction of the lattice panel. In the wide L-shaped retainer, the upper part of the wide vertical piece is fixed to the inner surface of the main bar at the front end or rear end of the lattice panel. The wide horizontal piece protrudes to the front side or the rear side of the grating. The upper surface of the wide horizontal piece is arranged in the same plane as the lower surface of the raising base. As shown in FIGS. 8 and 9, the concrete block forms beam portions on the front and rear sides of the upper surface opening, respectively. When the grating is fitted into the upper surface opening of the concrete block, as shown in FIGS. 10 and 12, the lateral piece of the wide L-shaped retaining member is positioned below the beam portion of the concrete block. In the grating, when a lifting force for pulling is applied, the horizontal piece of the wide L-shaped retaining member hits the lower surface of the beam portion of the concrete block and does not rise.

  As shown in FIG. 3, the retaining mechanism of the third example is provided with a wide L-shaped retaining tool at both the front and rear ends of the grating as in the second example. It is fixed at the center. When the grating is fitted into the upper surface opening of the concrete block, as shown in FIGS. 11 and 12, the lateral piece of the wide L-shaped retaining member is placed under the beam portion of the concrete block or the concrete plate-like lid. Located on the lower side.

Registered Utility Model No. 3133644

[Task]
In the grating retaining mechanism as described above, <Problem 1>
As in the first and second examples, the retaining mechanism in which the L-shaped retaining tool is fixed to the end of the raised base requires a notch recess on the lower surface of the concrete plate-like lid. In order to use a ready-made concrete plate-like lid without such a notch recess, it takes time to additionally process the notch recess. In addition, when the vertical piece of the L-shaped retainer is fixed to the front end or the rear end of the raising table, in order to prevent the vertical piece from projecting to the front side or the rear side from the front end or the rear end of the lattice panel, The rear end needs to be recessed more than the thickness of the vertical piece from the front end or rear end of the lattice panel. In order to attach the L-shaped retainer to the ready-made grating which is not so, it takes time and effort to cut or scrape the front end or rear end of the raising base. On the contrary, when the L-shaped retainer is attached to the ready-made grating in which the front end or the rear end of the raising base is recessed more than the thickness of the vertical piece, the horizontal piece of the L-shaped retainer becomes the front end or the rear of the lattice panel. The amount protruding from the end is reduced.
As in the second and third examples, the retaining mechanism in which the L-shaped retainer is fixed to the center portion in the left-right direction of the lattice panel has the vertical piece of the L-shaped retainer at the front end or the rear end of the ready-made lattice panel. When welding to the inner surface of the main bar, the work space for welding is narrow and difficult to work. The adjacent main bar that faces the inner surface of the main bar that welds the vertical pieces and the cross bar that penetrates the upper part of the main bar interfere with the welding operation.
Gratings with L-shaped retainers are difficult to manufacture. The L-shaped retainer is difficult to attach to a ready-made grating or a ready-made lattice panel.

<Problem 2>
As in the first and second examples, the retaining mechanism in which the L-shaped retaining tool is fixed to the end of the raised base cannot be used for the beam portion adjacent to the top surface opening of the concrete block. As in the second example and the third example, the retaining mechanism in which the L-shaped retaining member is fixed to the center portion in the left-right direction of the lattice panel cannot be used for the end portion of the concrete plate-like lid with the hand-holding recess.
Gratings with L-type retainers have a narrow range of use. It takes time and effort to produce and use multiple types.

[Concept]
<Concept 1>
The retainer is formed into a stepped shape by bending a square metal plate at two locations. The stair-type retainer is composed of a vertical piece, an upper horizontal piece that protrudes rearward from the upper end of the vertical piece, and a lower horizontal piece that protrudes forward from the lower end of the vertical piece. The upper lateral piece is fixed to the front end or rear end of the grating. The vertical piece protrudes below the grating. The lower lateral piece is arranged below the grating and protrudes to the front side or the rear side of the grating.
The member surface of the grating that fixes the upper horizontal piece of the staircase retainer is the lower surface of the lattice panel. The upper surface of the upper horizontal piece is fixed to the lower surface of the lattice panel by welding or the like. Wide working space for welding, etc., making it easy to work.
After all, the retaining mechanism of the grating is easy to manufacture. The stair-type retainer is easy to add to a ready-made grating or a ready-made lattice panel.

<Concept 2>
When fixing the upper horizontal piece of the stair type retainer to the front end or rear end of the lower surface of the lattice panel, when selecting the fixed left and right position, the lattice facing the left and right lid holders of the top opening of the concrete block when used Avoid the left and right edges of the panel. The fixed left and right direction position is set to a portion other than the left and right lid receiving portions facing the end portions. The lower horizontal piece is not placed on the left and right lid receiving portions of the upper surface opening of the concrete block. A notch recess is not necessary on the lower surface of the concrete plate-like lid. The ready-made concrete plate-shaped lid can be used as it is without additional processing.
When selecting the length of the vertical piece that determines the vertical position of the lower horizontal piece, the stair type retainer is used when the lower horizontal piece is under the beam of the concrete block adjacent to the grating or the concrete plate-like lid. The length is located on the lower side.
The retaining mechanism that fixes the stair-type retainer to the left and right lid rests at the front or rear end of the lower surface of the grid panel is not limited to the concrete block beam or the end of the concrete plate lid. Can also be used.

<Concept 3>
Furthermore, when fixing the upper horizontal piece of the stair-type retainer to the front end or the rear end of the lower surface of the lattice panel, when selecting the right and left direction position of the lattice panel in use, the lattice panel adjacent to the cue recess of the concrete plate lid is used. Avoid left and right center. The fixed horizontal position is set to a portion other than the central portion adjacent to the cue recess.
The retaining mechanism in which the stair-type retaining tool is fixed to a portion other than the central portion adjacent to the hand-clamped concave portion at the front end or rear end of the lower surface of the lattice panel can be used for the end portion with the hand-capped concave portion of the concrete plate-like lid.
After all, the step-type retaining device is not the left and right lid receiving portions at the front or rear end of the lower surface of the lattice panel, but the portion other than the central portion adjacent to the cue recess, that is, the left-right central portion of the left half of the lattice panel The retaining mechanism fixed to the center of the right and left sides of the right half is used for the beam part of the concrete block, the end of the concrete plate-like lid with the cue recess, and the end of the concrete plate-like lid without the cue recess. be able to.
The retaining mechanism of the grating using the stair-type retaining tool has a wide range of use. There is no need to create and use multiple types.

1. In the retaining mechanism in which retaining tools are fixed to the front and rear ends of the grating that are dropped into the top opening of the concrete block in the side groove or waterway,
The grating of the metal lattice lid is fixed to the left and right end portions of the bottom surface of the lattice panel along the front and rear directions respectively.
The upper surface opening of the concrete block is provided with lid receiving portions on the left and right, and the left and right raised portions of the grating and the left and right ends of the concrete plate-shaped lid are placed on the left and right lid receiving portions,
The grating is configured to be adjacent to the concrete plate-like lid in the upper surface opening or the beam part next to the upper surface opening of the concrete block when used dropped into the upper surface opening of the concrete block.
The retainer is bent in two places to form a staircase, and the staircase retainer is a vertical piece, an upper horizontal piece that protrudes from the upper end of the vertical piece to the rear side, and a front side from the lower end of the vertical piece. Consists of a lower horizontal piece protruding into
The stair-type retainer has an upper horizontal piece fixed to the lower surface of the lattice panel by welding, etc., a vertical piece protrudes to the lower side of the lattice panel, and a lower horizontal piece is placed on the lower side of the lattice panel, and the front side of the grating Or, a grating retaining mechanism characterized by protruding rearward.
2. In the grating retaining mechanism of 1 above,
The horizontal position to fix the upper horizontal piece to the front end or rear end of the lower surface of the lattice panel is the portion other than the left and right ends of the lattice panel facing the left and right lid receiving portions of the upper surface opening of the concrete block during use. The lower lateral piece is configured to be positioned below the beam portion of the concrete block or below the concrete plate-like lid.
3. In the grating retaining mechanism of 1 above,
The horizontal position that fixes the upper horizontal piece to the front or rear edge of the lower surface of the lattice panel is the portion other than the central portion of the horizontal direction of the lattice panel adjacent to the cue recess of the concrete plate lid when used, and the lower horizontal piece when used Is located on the lower side of the concrete plate-like lid with the clue concave portion, the end portion of the concrete plate-like lid without the clue concave portion or the beam portion of the concrete block.
4). In the grating retaining mechanism of 1 above,
The horizontal position to fix the upper horizontal piece to the front end or rear end of the lower surface of the lattice panel is other than the left and right ends of the lattice panel facing the left and right lid receiving portions of the upper surface opening of the concrete block in use, and the concrete is in use. The part of the lattice panel adjacent to the concave part of the plate-shaped lid on the left and right sides of the plate-shaped lid is not the center part in the left-right direction. It is characterized by being configured to be located on the lower side of the end portion of the lid having no clue.
5. In the grating retaining mechanism according to any one of 1 to 4,
Two staircase stoppers are fixed to the left and right sides of the grating at the front and rear ends, respectively.
6). In the grating retaining mechanism according to any one of 1 to 4,
One staircase-type stopper is fixed to each of the front end and the rear end of the grating.
7). In the grating retaining mechanism according to any one of 1 to 4,
Two staircase stoppers are fixed to one end of the front end or rear end of the grating on the left and right sides, and one is fixed to the other end.
8). In the above-described 7 grating retaining mechanism,
The stair-type retainer is characterized in that one of the other ends of the front end or the rear end of the grating is arranged at the center in the left-right direction of the lattice panel.

  The grating retaining mechanism using the stepped retaining tool is easy to manufacture. Wide range of use.

The top view of the grating with the retaining mechanism in the 1st example of the embodiment of the present invention. The front view of the grating with the same retaining mechanism. The side view of the grating with the same retaining mechanism. The perspective view of the staircase-type retainer of the retainer mechanism. The top view which shows the use condition of the grating with the same retaining mechanism. The front view which shows the use condition. The side view which shows the use condition. The top view which shows the other use condition of the grating with the same retaining mechanism. The top view of grating with a retaining mechanism in the 2nd example. The top view of the grating with the retaining mechanism in a 3rd example.

[First example (see FIGS. 1 to 8)]
The grating with a retaining mechanism of this example includes a grating 1 and a stepped retaining tool 11.
The grating 1 of the metal lattice lid is formed by welding steel materials. And as shown in FIGS. 1-3, it consists of the lattice panel 2 and the raising stand 3. FIG. The square plate-like lattice panel 2 has square bar-shaped raising bases 3 fixed to the left and right ends of the lower surface along the front-rear direction. Each of the left and right raising bases 3 has a front end face and a rear end face arranged in the same plane as the front end face and the rear end face of the lattice panel 2, respectively. The square plate-like lattice panel 2 has end bars 6 arranged in parallel at the left end and the right end, and a main bar 7 is stretched between the left and right end bars 6 along the left-right direction and fixed. A large number of main bars 7 are arranged at equal intervals in the front-rear direction. Each main bar 7 of the horizontally long rectangular plate has a bar-shaped cross bar 8 penetrating in the front-rear direction and fixed to the upper part. A large number of crossbars 8 are arranged at equal intervals in the left-right direction.

As shown in FIG. 4, the staircase stopper 11 has a staircase shape by bending a rectangular steel plate at two locations. It consists of a vertical piece 12, an upper horizontal piece 13 and a lower horizontal piece 14. The vertical piece 12 protrudes from the upper end to the upper horizontal piece 13 to the rear side, and protrudes the lower horizontal piece 14 from the lower end to the front side.
As shown in FIGS. 1 to 3, the staircase-type stopper 11 is fixed to the front end and the rear end of the grating 1. In the step-type retainer 11 at the front end, the upper horizontal piece 13 is fixed by welding the upper surface to the lower surface of the grating lattice panel 2 and arranged at the front end of the lower surface of the lattice panel 2. The vertical piece 12 protrudes downward, and the front side surface is disposed in the same plane as the front end surface of the lattice panel 2. The lower horizontal piece 14 is arranged at a position where the upper surface is lower than the lower surface of the raising board 3 of the grating and protrudes to the front side of the lattice panel 2. The same applies to the stepped stopper 11 at the rear end. The front end and rear end staircase stoppers 11 have a forward and rearward symmetrical posture.

  At the front end and the rear end of the grating 1, as shown in FIGS. 1 and 2, there are two step-type stoppers 11, which are fixed to the left and right sides of the lattice panel 2. The left staircase stopper 11 is disposed in the left-right direction central portion 21 of the left half of the lattice panel 2. The right staircase stopper 11 is disposed in the left-right direction central portion 21 of the right half of the lattice panel 2.

The left and right central part 21 of the left half and the right and left central part 21 of the right half of the lattice panel 2 for fixing the staircase stopper 11 are determined as follows.
Between the left end and the right end of the lattice panel 2, when the grating 1 is used, the lattice panel 2 faces the left and right lid receiving portions 33 of the upper surface opening 32 of the concrete block 31, and the left and right ends 22, and the lattice panel 2 is a concrete plate. The center part 23 in the left-right direction adjacent to the cue concave part of the lid is obtained. Between the left end portion 22 facing the left lid receiving portion and the left and right central portion 23 adjacent to the cue recess, the left half left and right central portion 21, and the right end portion 22 facing the right lid receiving portion and the left central portion adjacent to the hand catch recess. 23 is the right-half central portion 21 in the left-right direction.
That is, the fixing position of the stepped stopper 11 in the left-right direction is a portion other than the left and right lid receiving portions 22 facing the end portion between the left end and the right end of the lower surface of the lattice panel 2 and a portion other than the center portion 23 adjacent to the cue recess. 21.

  When using the grating 1 with the retaining mechanism of the present example for the upper surface opening 32 of the concrete block 31 in the side groove, the grating 1 with the retaining mechanism has the front-rear direction as the flow direction of the side groove, as shown in FIGS. The left and right direction is made to coincide with the width direction of the side groove and dropped into the upper surface opening 32 of the concrete block. Further, the concrete plate-like lid 36 is dropped into the upper surface opening 32 of the concrete block. The concrete plate-like lid 36 has a cue recess 37 on the grating 1 side. The grating 1 places the left and right raising bases 3 on the left and right lid receiving portions 33 of the upper surface opening 32, respectively. The left and right staircase stoppers 11 at the rear end respectively arrange the lower lateral piece 14 below the beam portion 34 adjacent to the concrete block 31 after the upper surface opening. The left and right staircase stoppers 11 at the front end are respectively disposed below the ends of the concrete plate-like lid 36 adjacent to the front end with the clue recesses 37. The lower horizontal pieces 14 of the left and right staircase-type retainers at the front end are located on both the left and right sides of the cue recesses 37 of the front concrete plate-like lid. When the grating 1 is applied with a lifting force, the lower lateral piece 14 of the front and rear staircase retainers is positioned on the lower surface of the beam 34 adjacent to the upper surface of the concrete block and the concrete plate-like lid 36. It does not rise when it hits the lower surface. Jumping up and theft are suppressed. When extracting the grating 1, the concrete plate cover 36 is removed first.

  When used in the upper surface opening of the concrete block 31 of the water channel, the grating 1 with a retaining mechanism, as shown in FIG. 8, aligns the front and rear direction with the flow direction of the water channel and the left and right direction with the width direction of the water channel. Is dropped into the upper surface opening 32. Further, the concrete plate-like lid 36 is dropped into the upper surface opening 32 of the concrete block. The concrete plate-like lids 36 are respectively arranged in front of and behind the grating 1. The grating 1 places the left and right raising bases 3 on the left and right lid receiving portions 33 of the upper surface opening 32, respectively. The left and right staircase-type stoppers 11 at the rear end respectively arrange the lower lateral piece 14 below the end portion of the concrete plate-like lid 36 adjacent to the rear without the clue recess. The left and right staircase stoppers 11 at the front end are respectively disposed below the ends of the concrete plate-like lid 36 adjacent to the front end with the clue recesses 37. The lower horizontal pieces 14 of the left and right staircase-type retainers at the front end are located on both the left and right sides of the cue recesses 37 of the front concrete plate-like lid. When the lifting force for pulling out is applied to the grating 1, the lower horizontal piece 14 of the step-type retaining device at the front end and the rear end hits the lower surface of the front and rear adjacent concrete plate-like lids 36 and does not rise. Jumping up and theft are suppressed. When extracting the grating 1, the concrete plate cover 36 is removed first.

  In the grating 1 with the retaining mechanism of the present example, the step-type retaining device 11 at the front end and the rear end has the beam portion 34 of the concrete block and the end portion with the clue concave portion 37 of the concrete plate-like lid 36, respectively. It is also used for the end portion of the concrete plate-like lid 36 without a cue recess. Wide range of use. There is no need to make and use many types.

[Second example (see FIG. 9)]
As shown in FIG. 9, the grating with the retaining mechanism of the present example is the same as that of the first example, as shown in FIG. Stair-type retainer is lost. One staircase-type stopper 11 is provided at each of the front end and the rear end of the grating 1.
In the grating 1 with the retaining mechanism of this example, the staircase-type retaining tool 11 is half. Production effort is reduced.

Further, each of the staircase-type stoppers 11 at the front end and the rear end of the grating 1 has the same fixing position as that of the first example. As in the first example, the beam portion of the concrete block 31 is used. 34, used for the end portion of the concrete plate-like lid 36 with the cue recess 37 and the end portion of the concrete plate-like lid 36 without the cue recess. Wide range of use.
Other points are the same as in the first example. Parts similar to those in the first example are denoted by the same reference numerals as those in the first example.

[Third example (see FIG. 10)]
The grating with the retaining mechanism of the present example is the same as that of the first example, as shown in FIG. 10, the stepped retaining tool 11 at the rear end is set to one, and the fixing position of the stepped retaining tool 11 is latticed. The center of the panel 2 in the left-right direction is used.
The grating 1 with the retaining mechanism of this example reduces the number of step-type retaining tools 11 and the labor of manufacturing.

Further, the number of staircase-type stoppers 11 at the front end and the fixing position are the same as those in the first example. As in the first example, it is used for the beam portion 34 of the concrete block 31, the end portion of the concrete plate-like lid 36 with the hand-holding concave portion 37, and the end portion of the concrete plate-like lid 36 without the hand-holding concave portion. The staircase-type stopper 11 at the rear end is used for the beam portion 34 of the concrete block and the end portion of the concrete plate-like lid 36 without the clue recess.
Other points are the same as in the first example. Parts similar to those in the first example are denoted by the same reference numerals as those in the first example.

[Modification]
The present invention is not limited to the above embodiment. The following modifications are exemplified.
1. In the first example of the above-described embodiment, the number of staircase-type stoppers 11 is four in the front, rear, left, and right, but any one of them is eliminated and three.
2. In the above embodiment, the staircase stopper 11 and the grating 1 are made of steel, but are made of other metal materials.
3. In the above-described embodiment, the stepped stopper 11 is welded as a means for fixing the upper lateral piece 13 to the lower surface of the grating lattice panel 2, but is made of adhesive, brazing or solder. Alternatively, other fixing means are used.

DESCRIPTION OF SYMBOLS 1 Metal lattice-like lid, grating 2 Lattice panel 3 Raising stand 6 End bar 7 Main bar 8 Cross bar 11 Stair type retainer 12 Vertical piece 13 Upper horizontal piece 14 Lower horizontal piece 21 Left and right of the left and right half of the lattice panel Center of direction, left and right fixed position 22 of stair type retainer 22 Left and right ends of grid panel, left and right lid receiving part facing end 23 Center part of grid panel left and right direction, central part adjacent to cue recess 31 Concrete block in side groove Concrete block 32 in water channel Upper surface opening 33 Lid receiving part 34 Beam part 36 Concrete plate-like lid 37

Claims (8)

In the retaining mechanism in which retaining tools are fixed to the front and rear ends of the grating that are dropped into the top opening of the concrete block in the side groove or waterway,
The grating of the metal lattice lid is fixed to the left and right end portions of the bottom surface of the lattice panel along the front and rear directions respectively.
The upper surface opening of the concrete block is provided with lid receiving portions on the left and right, and the left and right raised portions of the grating and the left and right ends of the concrete plate-shaped lid are placed on the left and right lid receiving portions,
The grating is configured to be adjacent to the concrete plate-like lid in the upper surface opening or the beam part next to the upper surface opening of the concrete block when used dropped into the upper surface opening of the concrete block.
The retainer is bent in two places to form a staircase, and the staircase retainer is a vertical piece, an upper horizontal piece that protrudes from the upper end of the vertical piece to the rear side, and a front side from the lower end of the vertical piece. Consists of a lower horizontal piece protruding into
The stair-type retainer has an upper horizontal piece fixed to the lower surface of the lattice panel by welding, etc., a vertical piece protrudes to the lower side of the lattice panel, and a lower horizontal piece is placed on the lower side of the lattice panel, and the front side of the grating Or, a grating retaining mechanism characterized by protruding rearward.   The horizontal position to fix the upper horizontal piece to the front end or rear end of the lower surface of the lattice panel is the portion other than the left and right ends of the lattice panel facing the left and right lid receiving portions of the upper surface opening of the concrete block during use. 2. The grating retaining mechanism according to claim 1, wherein the lower lateral piece is located below the beam portion of the concrete block or below the concrete plate-like lid.   The horizontal position that fixes the upper horizontal piece to the front or rear edge of the lower surface of the lattice panel is the portion other than the central portion of the horizontal direction of the lattice panel adjacent to the cue recess of the concrete plate lid when used, and the lower horizontal piece when used 2. The grating according to claim 1, wherein the end portion of the concrete plate-like lid is positioned below the end portion of the concrete plate-like lid with the cue recess portion, the end portion of the concrete plate-like lid portion without the cue-like recess portion, or the beam portion of the concrete block. Retaining mechanism.   The horizontal position to fix the upper horizontal piece to the front end or rear end of the lower surface of the lattice panel is other than the left and right ends of the lattice panel facing the left and right lid receiving portions of the upper surface opening of the concrete block in use, and the concrete is in use. The part of the lattice panel adjacent to the concave part of the plate-shaped lid on the left and right sides of the plate-shaped lid is not the center part in the left-right direction. 2. The grating retaining mechanism according to claim 1, wherein the latching lid is positioned below the end portion of the lid having no clue.   5. The grating retaining mechanism according to claim 1, wherein two stepped retaining tools are fixed to the left side and the right side, respectively, at the front end and the rear end of the grating.   5. The grating retaining mechanism according to claim 1, wherein one staircase retaining tool is fixed to each of a front end and a rear end of the grating.   5. The stair-type retainer is fixed at one end of the front end or rear end of the grating to the left and right sides, and one at the other end. The described grating retaining mechanism.   The staircase-type retainer has one of the other ends of the front end or the rear end of the grating disposed in the center in the left-right direction of the lattice panel. Retaining mechanism.

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