EP4339382A1 - Abdeckelement für ein strassenschacht - Google Patents

Abdeckelement für ein strassenschacht Download PDF

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Publication number
EP4339382A1
EP4339382A1 EP23196968.4A EP23196968A EP4339382A1 EP 4339382 A1 EP4339382 A1 EP 4339382A1 EP 23196968 A EP23196968 A EP 23196968A EP 4339382 A1 EP4339382 A1 EP 4339382A1
Authority
EP
European Patent Office
Prior art keywords
walls
rest
wall
covering element
rib
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23196968.4A
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English (en)
French (fr)
Inventor
Franco Davoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FLli Moro Srl
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FLli Moro Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FLli Moro Srl filed Critical FLli Moro Srl
Publication of EP4339382A1 publication Critical patent/EP4339382A1/de
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/06—Gully gratings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
    • E01C11/224—Surface drainage of streets
    • E01C11/227—Gutters; Channels ; Roof drainage discharge ducts set in sidewalks

Definitions

  • the present invention concerns a covering, closing or crowning element, such as a grid, a manhole cover, a drain cover or suchlike, for a road well, such as for example a drainage channel or other.
  • a covering, closing or crowning element such as a grid, a manhole cover, a drain cover or suchlike, for a road well, such as for example a drainage channel or other.
  • the present invention is applied as an inspectable covering or closing element that allows a desired passage of air and/or water inside the corresponding road well, both for drainage purposes and also for aeration purposes.
  • Elements for covering, closing or crowning road wells are known, such as for example grids, or drains, for drainage channels, for example of the type provided at the edges of sidewalks, cycle paths, road tracks or other traffic routes, but also parking areas or special areas for particularly high loads such as ports, airports or industrial sites.
  • Known grids are generally structured with a metal plate, for example in cast iron or steel cast, provided with at least two rest edges on the side walls of the well and on which a plurality of through slots are created or molded, distanced apart from each other to define intermediate rest walls, so as to substantially form a grating capable of draining water and mechanically counteracting the overhead load of a pedestrian or a vehicle, according to the values and modes described in the international regulatory norms of the sector.
  • transverse ribs are provided projecting from the rest walls in a manner coordinated with the direction of application of the load.
  • each rest wall a substantially T-shaped cross-section, overall defining a substantially comb-shaped transverse conformation of the grid.
  • ribs with a trapezoidal longitudinal shape, that is, arched, or possibly semicircular, to support the load distribution and the intensity of the bending.
  • known ribs are tapered downward, in order to promote the conditions of extraction from the forming molds that are normally used.
  • One of the main disadvantages of this type of conformation is precisely that it has the thinnest, that is, the least performing, section in the point of the grid that is the most stressed and subjected to traction, that is, the lowest part of the rib, precisely due to the tapered transverse conformation of the rib.
  • the entire thickness and height of the rib is normally increased proportionally, with a consequent significant increase in weight, overall dimensions in the lower part, as well as waste of material (not involved in giving resistance to the product) and therefore production costs.
  • Document DE202019005414 U1 describes a covering grid for a water collection and drainage offlet, which can be a gutter or can be made in the ground.
  • the covering grid comprises one or more upper rest or walking walls, and rib walls protruding downward with respect to the rest walls, thus forming an inverted "U" with them.
  • the lower parts of the rib walls rest on the offlet, and between them there is a plurality of aligned reinforcement portions reciprocally distanced apart from each other to allow the passage of water toward the offlet, and having a segment that is parallel and a segment that is slightly inclined with respect to the rest walls.
  • the grid is made from a single suitably bent and shaped piece of sheet metal, therefore it has a reduced weight and thicknesses, and it can be able to support and withstand low weight forces, for example a few tens or, at most, a few hundred kilograms.
  • Document DE202014102436 U1 describes a cast iron covering grid having a plurality of water passage holes of various shapes and sizes on the walking surface.
  • the grid is provided with a plurality of rectilinear, or arcuate, rib walls having different shapes and sizes, connected to each other by stiffening plates transverse to them.
  • one purpose of the present invention is to provide a covering, or closing, or crowning element for a road well that allows to respect the loading and bending conditions required by current regulations and, at the same time, allows to reduce the overall dimensions and weights of, in particular, its structural parts.
  • Another purpose of the present invention is to provide a covering, or closing, or crowning element which is simple and economical to produce, while guaranteeing compliance with current regulations.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a covering or crowning element according to the present invention for a road well or a drainage channel, comprises a metal support body, made of cast iron or steel cast, produced from a single casting.
  • the support body is provided with one or more rest walls which, in some embodiments, are substantially coplanar with respect to the walking plane on which the road well is created, and are distanced apart from each other by a plurality of drainage slots, the latter being created on the support body, defining a grating.
  • the support body also comprises two rest edges, by means of which it is positioned and possibly attached to the lateral side walls of the road well.
  • the support body also comprises rib walls projecting from the rest walls in a manner coordinated with the direction of application of a weight force.
  • the covering element also has the advantage of guaranteeing economic savings linked to the use of a smaller quantity of raw material. It follows that, advantageously, there are lower transport costs linked to the reduction in the weight of the covering elements.
  • the covering element comprises a plurality of contiguous stiffening load-bearing structures, having a structural function of resisting the load generated by said weight force, and each being defined by a lower reinforcement wall connected to at least one corresponding rib wall, which is in turn connected to a corresponding rest wall.
  • Each reinforcement wall is capable of resisting the tensile stresses generated by the weight force and disposed substantially parallel, or slightly inclined, with respect to the rest wall.
  • each reinforcement wall is monolithic and continuous along the entire longitudinal extension of the corresponding rib wall.
  • the masses are increased in an optimized manner and disposed appropriately, essentially only where they intervene effectively for the purposes of resisting the mechanical stresses involved, in this case the overall capacity of the covering or crowning element.
  • the Applicant has tested that, with the same mechanical and bending resistance as known solutions, the covering or crowning element according to the present invention creates a saving in weight of material comprised in a range between approximately 10% and approximately 25%, in relation to the overall dimensions, the production technique and the choice of geometry or aesthetics that are to be achieved.
  • each reinforcement wall is made at a lower end of the rib wall, on the opposite side with respect to the rest wall.
  • each reinforcement wall at least partly protrudes from one side with respect to the rib wall. According to possible embodiments, each reinforcement wall at least partly protrudes from both sides with respect to the rib wall.
  • At least one of the reinforcement walls is made as a connection between two adjacent rib walls, forming a substantially box-shaped structure.
  • the rib walls which are disposed transversely with respect to the walls of the drainage channel have a shaped longitudinal conformation
  • the reinforcement walls have a conformation shaped in a coordinated manner with respect to that of the rib walls.
  • each reinforcement wall has a substantially continuous conformation along the entire longitudinal extension of the rib wall.
  • each reinforcement wall is possibly made in an alternating manner on the rib walls, along the longitudinal extension of the drainage channel or well.
  • each reinforcement wall comprises at least one lightening aperture made along the longitudinal extension of the rib wall.
  • the covering or crowning element comprises at least one stiffening wall disposed substantially transverse to the rib walls.
  • the covering element rests with perimeter portions directly on the lateral side walls of the drainage channel, while the rest edges contact, with a lateral surface thereof, an upper lateral portion of the draining cavity, thus guaranteeing an effective and solid coupling between the grid itself and the drainage channel.
  • the stiffening load-bearing structures are each defined by a box structure comprising a reinforcement wall connected to two reciprocally facing rib walls, which are each connected to a corresponding rest wall in such a way as to determine an inverted ⁇ shape.
  • the stiffening load-bearing structures are conformed in such a way as to have an "S" or "Z" shape.
  • the covering element comprises first drainage slots which are delimited by two corresponding rest walls of a same box structure, wherein the rest walls of two different adjacent box structures are in contact with each other.
  • the covering element comprises first drainage slots which are delimited by two corresponding rest walls of a same box structure, wherein the rest walls of two different box structures are adequately distanced apart from each other in such a way as to define second drainage slots.
  • the covering element comprises first drainage slots which are delimited by two corresponding rest walls of a same box structure, wherein the rest walls of two different box structures are adequately distanced apart from each other in such a way that between them there is disposed a corresponding runoff element for the water, preferably having a "V" or "U” shaped section, which defines second drainage slots with its conformation and which extends up to the rest edges to collaborate with them in order to guarantee a stable support.
  • the stiffening wall is able to distribute the load generated by the weight force on multiple box structures disposed parallel to each other, in such a way as to counteract any torsions or vibrations, and to divide the length of the drainage slots.
  • the covering element is in a single piece and obtained by casting molten metal material, in particular iron, cast iron, steel, or one or more plastic or composite materials based on synthetic resins.
  • a covering, or closing, or crowning element according to the present invention is, in this specific case, a grid 10, or drain, applied to a drainage channel 20, or in the form of a manhole cover 110 applied to a well 120, in this specific case with a square shape.
  • manhole cover 110 it is not excluded that it can be understood as a drain or other covering element provided with apertures for water drainage.
  • the drainage channel 20, or the well 120 are shown schematically for the sole purpose of further clarifying the operational application of the grid 10, or of the corresponding manhole cover 110. It is clear that the drainage channel 20, or the well 120, can have different sizes and conformations, more aligned with the functional needs of the roadwork to which it is applied.
  • drainage channel 20, or well 120 can be made in correspondence with roads, parking lots, airports and/or transit areas for cars, heavy duty vehicles and motor vehicles in general.
  • the drainage channel 20 is generally defined by a draining cavity 21, having a certain depth and width as a function of the required drainage flow rate, and by two lateral containment side walls 22 made of concrete.
  • the well 120 is generally defined by a runoff cavity 121, having a certain depth and width as a function of the required drainage flow rate, and by at least two lateral containment side walls 122 made of concrete.
  • the closing element, or grid, 10, or manhole cover 110 are produced by means of a single casting, to thereby obtain a single piece.
  • the material used can be iron, cast iron, steel or similar materials that allow to obtain said single piece.
  • the grid 10, or the manhole cover 110 commonly consist mainly of a support body, or a support plate 11 made through cast iron molding, by means of normal foundry machines, for example with the so-called "sand casting" system, both horizontal as well as vertical, and also with multiple castings.
  • the metal in the liquid state is cast in a temporary mold created within a block of composite soil resistant to heat and permeable to the gases emitted.
  • it is a soil composed of silica sand, clay, bentonite, sodium silicates and various additives in a single block that after cooling is easily destroyed, releasing the desired single piece.
  • the support plate 11 comprises rest edges 12 created at least along the opposite longitudinal sides thereof, that is, perimetrically to the support plate 11 itself, so that they can rest on the upper ends of the corresponding lateral side walls 22 and 122 and keep the support plate 11 intentionally suspended above the draining cavity 21 or the runoff cavity 121.
  • the rest edges 12 are also created along the transverse sides of the support plate 11, for example to rest on a corresponding front or rear side wall (not shown), for example in the event it is applied to a well 121 with four concurrent side walls, or to cooperate with a manhole cover 110 or an adjacent grid 10.
  • rest edges 12 are provided on all the transverse and longitudinal sides of the plate 11 and with crossed or concurrent reinforcements.
  • the support plate 11 comprises a plurality of rest walls 13 disposed substantially transverse and distanced apart from each other grid-wise by corresponding drainage slots 17, 17' made through on the support plate 11 itself.
  • the drainage slots 17, 17' can be defined by first drainage slots 17 in combination, or not, with second drainage slots 17'.
  • a plurality of bosses 18 are provided on the upper surface of the rest walls 13, which are capable of improving the surface friction conditions of the grid 10, so as to substantially uniform the grip of the tires travelling between the asphalted road surface and the metal surface of the grid 10.
  • each rest wall 13 there are corresponding rib walls, or ribs 14, each of which extends toward the draining cavity 21 following a direction coordinated to the direction of application of a certain weight force W.
  • weight force W also in view of the preferential road application of the object of the present invention, we mean both the weight force itself, defined by the mass of the grid 10 or of the manhole cover 110, and also the sum of the loads applied on the grid 10 or on the manhole cover 110, due, for example, to the passage of pedestrians and/or vehicles specific to the actual application of the grid 10, or of the manhole cover 110, that is, all the prevailing stresses that determine the bending sizing criteria of the grid 10, or of the manhole cover 110.
  • the closing element, or grid, 10, or manhole cover 110 are able to withstand very high loads, higher than said weight force W.
  • closing element, or grid, 10, or manhole cover 110 is made in such a way as to comply with certain characteristics, or parameters, set forth in current European or international legislation, and contained in the EN 1433 standard, for example.
  • the closing element, or grid 10 comprises a plurality of reinforcement walls 15, which are created in one piece with the ribs 14, advantageously at a corresponding lower end of the latter, and oriented substantially parallel to the rest walls 13.
  • a plurality of contiguous stiffening load-bearing structures are formed, having a structural function of resisting the load generated by the weight force W, and each defined by a lower reinforcement wall 15 connected to at least one corresponding rib wall 14, in turn connected to a corresponding rest wall 13.
  • structural function we mean that this box structure 30 allows to obtain the maximum performance in terms of stability and reaction to the load generated by the weight force W.
  • Each reinforcement wall 15 is able to withstand the tensile stresses generated by the weight force W and disposed substantially parallel, or slightly inclined, with respect to the rest wall 13. Furthermore, each reinforcement wall 15 is monolithic and continuous along the entire longitudinal extension of the corresponding rib wall 14.
  • the reinforcement wall 15 is made in a single piece along the entire longitudinal extension of the corresponding rib wall 14, from one rest edge 12 to the other. This is valid even if one or more apertures are created in the reinforcement wall 15 along its longitudinal extension.
  • the rib 14 has a longitudinal shape that is substantially jointed trapezoidal, so as to be more resistant to bending in correspondence with the greater stress given by the weight force W applied, and in any case allowing the outflow of the water to be drained.
  • the rib walls, or ribs, 14 can be made so as to have respective inclined terminal portions 24 that connect to the rest edges 12. Moreover, in correspondence with the inclined portions 24, respective front apertures 23 for draining the water that accumulates inside the box structure 30 ( fig. 19 ) can be made on the corresponding reinforcement wall 15.
  • the ribs 14 have an extension that is slightly inclined, yet still coordinated, with respect to the direction of application of the weight force W, so as to promote the draft of the normal molding equipment provided to manufacture the grid 10.
  • the reinforcement walls 15 are created in such a way as to connect the ribs 14 two by two, and thus define the box structures having an inverted ⁇ shape, which bring additional advantages to the structural stability of the grid 10.
  • the stiffening load-bearing structures are each defined by a box structure 30 comprising a reinforcement wall 15 connected to two reciprocally facing ribs 14, each connected to a corresponding rest wall 13, so as to determine the inverted ⁇ shape.
  • the reinforcement walls 15 are possibly created in an alternated manner on corresponding rib walls 14, along the longitudinal extension of the road channel or well 20, 120.
  • At least one stiffening wall 16 is also provided, made below the rest walls 13 in a direction that is substantially longitudinal to the support plate 11.
  • a single stiffening wall 16 is provided disposed in a substantially median zone between the two rest edges 12, in order to confer a desired resistance to bending, also in a longitudinal direction to the grid 10, or to divide the length of the drainage slot 17 in order to improve and optimize accessibility on the support plate 11.
  • each stiffening wall 16 is able to distribute the load on several box structures 30 disposed parallel to each other, so as to counteract any torsions or vibrations.
  • the stiffening walls allow to divide the length of the drainage slots 17 in order to improve the passage of pedestrians and cyclists on the grid.
  • the rib 14 has an arcuate longitudinal shape, or possibly substantially semicircular, also in this case to be more resistant to the bending given by the weight force W applied.
  • the ribs 14 have an extension that is slightly inclined, yet still coordinated, with respect to the direction of application of the weight force W, so as to promote the draft of the normal molding equipment provided to manufacture the grid 10.
  • the reinforcement walls 15 are created so as to connect the ribs 14 two by two and define the semi-box structures with a substantially inverted ⁇ shape; however, in this case through lightening holes 19 are provided, which also allow the drainage of the stagnant water toward the draining cavity 21.
  • the stiffening load-bearing structures are each defined by a box structure 30 which comprises a reinforcement wall 15 connected to two reciprocally facing ribs 14, each connected to a corresponding rest wall 13, so as to determine the inverted ⁇ shape.
  • two stiffening wall 16 are also provided, made below the rest walls 13 in a direction that is substantially longitudinal to the support plate 11.
  • the stiffening walls 16 are disposed substantially symmetrical with respect to a median plane between the two rest edges 12, in order to confer a desired resistance to bending, also in a longitudinal direction to the grid 10.
  • the number and position of the stiffening walls 16 is advantageously chosen as a function of the sizes and loads to which the grid 10 is operatively subjected.
  • first drainage slots 17 are provided which are delimited by two corresponding rest walls 13 of a same box structure 30.
  • the rest walls 13 of two different adjacent box structures 30, with the exception of the initial and terminal ones, are in contact with each other.
  • the first drainage slots 17 are provided and the rest walls 13 of two different box structures 30 are adequately distanced apart from each other in such a way as to define second drainage slots 17'.
  • the first drainage slots 17 are provided and the rest walls 13 of two different box structures 30 are adequately distanced apart from each other in such a way that a corresponding runoff element 28 is disposed between them, preferably having a "V" or "U” shaped section. With its conformation, the runoff element 28 defines the second drainage slots 17' and extends up to the rest edges 12 cooperating with them in order to guarantee a stable support of the grid 10.
  • the rib 14 has a substantially arcuate longitudinal shape, or possibly substantially semicircular, also in this case to be more resistant to the bending given by the weight force W applied.
  • the ribs 14 have an extension that is slightly inclined, yet still coordinated, with respect to the direction of application of the weight force W, so as to promote the draft of the normal molding equipment provided to manufacture the grid 10.
  • the reinforcement walls 15 are created either on one side or on the other side, with respect to the rib 14, so that they define, with the corresponding rest walls 13, a substantially “S" or “Z” shaped section.
  • the stiffening load-bearing structures are conformed in such a way as to have a reinforcement wall 15 connected to at least one rib 14, and each connected to a corresponding rest wall 13, thus determining an "S" or "Z" shape.
  • five stiffening wall 16 are provided, made below the rest walls 13 in a direction that is substantially longitudinal to the support plate 11.
  • a median stiffening wall 16 that extends for the entire depth of the ribs 14, and four lateral stiffening walls 16 having a lower depth and disposed substantially symmetrically with respect to a median plane between the two rest edges 12.
  • the rib 14 has an arcuate longitudinal shape, or possibly substantially semicircular, also in this case to be more resistant to the bending given by the weight force W applied.
  • some ribs 14 have an extension that is slightly inclined, yet still coordinated, with respect to the direction of application of the weight force W, while other ribs 14 are substantially vertical, but tapered downward, again to promote the draft of the normal molding equipment provided to manufacture the grid 10.
  • the reinforcement walls 15 are created so as to connect the ribs 14 two by two, and through lightening holes 19 are provided which also allow the drainage of the stagnant water toward the draining cavity 21.
  • the reinforcement walls 15 are also ribs 14 without reinforcement walls 15.
  • the stiffening load-bearing structures are each defined by a box structure 30 which comprises a reinforcement wall 15 connected to two reciprocally facing ribs 14, each connected to a corresponding rest wall 13, so as to determine the inverted ⁇ shape.
  • triangular-shaped stiffening walls 16 are provided, created as a connection between the ribs 14 and the corresponding rest walls 13, in specific and individual positions.
  • the limited lateral sizes of the grid 10 compared to the other embodiments described and shown so far, do not require one or more stiffening walls 16 extending longitudinally to the support plate 11, but can be reduced and focused on specific positions, to achieve the desired mechanical strength conditions.
  • the number and position of the stiffening walls 16 are advantageously chosen as a function of the sizes and loads to which the grid 10 is operatively subjected, further optimizing the ratio between mechanical strength and weight of the grid 10, as well as the aesthetics and accessibility of the support plate 11.
  • the grid 10 can rest with perimeter portions 26 of the support plate 11 directly on the lateral side walls 22 of the drainage channel 20, while the rest edges 12 contact the draining cavity 21 with a lateral surface 27 thereof, thus guaranteeing an effective and solid coupling between the grid 10 itself and the drainage channel 20 ( fig. 10 ).
  • the manhole cover 110 has the rib 14 with a longitudinal shape that is substantially trapezoidal, so as to be more resistant to bending, in correspondence with the greater stress given by the weight force W applied and, in any case, allowing the outflow of the water to be drained.
  • the ribs 14 are disposed two by two, so as to extend and define two transverse pairs and two longitudinal pairs, with respect to the rest wall 13.
  • the reinforcement walls 15 are created so as to connect the ribs 14 two by two and define the box structures, having a substantially inverted ⁇ shape, which, in this case, are substantially orthogonal to each other. Also in this case, the reinforcement walls 15 are monolithic and such as to withstand the tensile stresses generated by the weight force W.
  • the stiffening load-bearing structures are each defined by a box structure 30 which comprises a reinforcement wall 15 connected to two reciprocally facing ribs 14, each connected to the rest wall 13, so as to determine the inverted SZ shape.
  • corresponding front apertures 23 are created ( figs. 5b, 6 ), which allow the drainage of the residual water also from the end front portions, further improving the drainage capacity of the manhole cover 110 thus created.
  • a plurality of bosses 18 can be provided on the upper surface of the rest walls 13, which are capable of improving the surface friction conditions of the manhole cover 110, so as to substantially uniform the grip of the tires travelling between the paved road surface and the metal surface of the manhole cover 110 itself, as well as decreasing the possibility of slipping on pedestrian areas.
  • the various ribs 14, the reinforcement walls 15 and the stiffening walls 16, instead of being made in one piece with the support plate 11, can be made individually and then welded together to define the desired resistant geometry according to the characteristics of the present invention.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)
EP23196968.4A 2022-09-13 2023-09-12 Abdeckelement für ein strassenschacht Pending EP4339382A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200018666 2022-09-13

Publications (1)

Publication Number Publication Date
EP4339382A1 true EP4339382A1 (de) 2024-03-20

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EP23196968.4A Pending EP4339382A1 (de) 2022-09-13 2023-09-12 Abdeckelement für ein strassenschacht

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EP (1) EP4339382A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201554117U (zh) * 2009-04-22 2010-08-18 翁平波 水沟盖
DE202014102436U1 (de) 2014-05-23 2014-07-30 Hauraton Gmbh & Co. Kg Abdeckung für eine Entwässerungsrinne
KR102049984B1 (ko) 2017-11-14 2019-11-28 (주)마이즈텍 압축 강도가 강화된 배수용 그레이팅
DE202019005414U1 (de) 2019-06-05 2020-07-16 Wiedemann Gmbh Rost als Abdeckung für eine Abflussrinne
CN213268249U (zh) 2020-04-15 2021-05-25 航天建筑设计研究院有限公司 一种进水篦子
KR102353812B1 (ko) 2019-09-24 2022-01-20 서일공영 주식회사 무용접 고강도 트렌치 커버 유닛, 이를 포함하는 트렌치 커버 및 그 제조방법

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201554117U (zh) * 2009-04-22 2010-08-18 翁平波 水沟盖
DE202014102436U1 (de) 2014-05-23 2014-07-30 Hauraton Gmbh & Co. Kg Abdeckung für eine Entwässerungsrinne
KR102049984B1 (ko) 2017-11-14 2019-11-28 (주)마이즈텍 압축 강도가 강화된 배수용 그레이팅
DE202019005414U1 (de) 2019-06-05 2020-07-16 Wiedemann Gmbh Rost als Abdeckung für eine Abflussrinne
KR102353812B1 (ko) 2019-09-24 2022-01-20 서일공영 주식회사 무용접 고강도 트렌치 커버 유닛, 이를 포함하는 트렌치 커버 및 그 제조방법
CN213268249U (zh) 2020-04-15 2021-05-25 航天建筑设计研究院有限公司 一种进水篦子

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