JP4625392B2 - Grating and its assembly method - Google Patents

Description

  The present invention provides a plurality of parallel main bars parallel to each other at predetermined intervals, spacer means for maintaining the predetermined intervals between the main bars, and between the one end portions and the other end portions of the main bars. The present invention relates to a grating and a method of assembling the same, each of which includes a pair of parallel sidebars connected to each other and is used as a water-permeable lid that covers an opening of a groove.

  In the conventional grating described above, the ends of all the main bars and the pair of end bars were individually joined and assembled by welding, but in this manufacturing method, the number of welding points as a whole increases, There existed problems, such as a manufacturing cost increasing, and the distortion resulting from welding heat easily.

Therefore, through holes are formed in each end bar at the arrangement pitch of the main bars, and engaging pieces protruding from both end surfaces of the main bar are fitted into the through holes, respectively. A grating has been proposed in which an outer end projecting from a hole is caulked from the outer surface side of an end bar so that both ends of each main bar are integrally coupled to the main bar (for example, Patent Document 1 below) , 2).
JP 2003-268867 A JP 2005-68945 A

  However, in the above-mentioned proposal, a pair of upper and lower protrusions projecting outward from the upper and lower ends of the outer surface of each end bar to protect the crimped portion (that is, the protruding end portion of the locking piece from the end bar). There is a problem in that the section needs to be specially provided, and the cross-sectional shape of the end bar becomes complicated and the cost increases. In addition, since the caulking portion (that is, the protruding end portion of the locking piece from the end bar) slightly protrudes and is exposed on the outer surface of the end bar between the pair of upper and lower protrusions, the appearance and appearance are poor. In addition, the operator may be injured when opening and closing the grating.

  In addition, the grating is set in the groove by engaging and placing the lower end portion of the end bar on the lid receiving step portion provided on the opening edge of the groove. In this set state, the outer surface of the end bar and the lid receiving step portion are set. A slit-like space between the pair of upper and lower protrusions is formed between the vertical wall, and there is a problem that foreign matter such as dust is easily trapped in the caulking portion in the space. is there.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a grating and a method for assembling the grating which can solve the above-described problems of the conventional structure at once with a simple structure.

  In order to achieve the above object, the invention of claim 1 is characterized in that a plurality of parallel main bars parallel to each other at a predetermined interval, and parallel to each other connecting between one end and the other end of each of the main bars. In a grating that includes at least a pair of end bars and is used as a water-permeable cover that covers the opening of the groove, engaging projections are provided on one end surface and the other end surface of each main bar respectively facing the inner side surfaces of the pair of end bars. While forming integrally, on the inner surface of each end bar, a plurality of blind hole engaging holes into which the engaging protrusions of a plurality of main bars are respectively inserted and engaged are recessed at the predetermined interval, One end of each main bar and at least one main bar arranged between each other with at least one main bar sandwiched between them is connected to the corresponding end bar. Characterized by being welded to the inner surface.

  According to a second aspect of the present invention, in addition to the above feature of the first aspect, the protrusion height of the engagement protrusion of each main bar is set smaller than the depth of the engagement hole of the corresponding end bar, In the state in which the engagement protrusion is fitted in the engagement hole, the end surface of each main bar is surely brought into contact with the inner surface of the corresponding end bar.

  According to a third aspect of the present invention, in addition to the above feature of the first or second aspect, both ends of the main bars located on the outer sides of the pair of main bars located on both outer sides are in contact with the inner surfaces of the pair of end bars. A pair of side bars extending in parallel with each other is disposed, and both end portions of each side bar are welded to the pair of end bars in a state where all main bars are set between the pair of end bars.

  According to a fourth aspect of the present invention, there is provided the grating assembling method according to any one of the first to third aspects, wherein a plurality of main bars are arranged between the inner surfaces of a pair of end bars parallel to each other. Are arranged so as to be parallel to each other and orthogonal to the end bars, and the engaging protrusions of the main bars are respectively inserted into the engaging holes of the corresponding end bars, and then a part of all the main bars. Then, each end part and each other end part of at least two main bars arranged with at least one main bar sandwiched therebetween are welded to the inner side surfaces of the corresponding end bars, respectively, It is characterized by being sandwiched and fixed between a pair of end bars.

  As described above, according to the present invention, in the grating, a plurality of main bars are arranged at predetermined intervals between the inner surfaces of the pair of end bars, and the engagement protrusions at both ends of the main bars are engaged with the corresponding end bars. One end and each other end of a part of the main bars (that is, at least two main bars arranged with at least one main bar sandwiched between them), which are respectively inserted into and engaged with the holes. All the main bars including the unwelded main bar can be firmly clamped and fixed between the pair of end bars simply by welding the part to the inner side surface of the corresponding end bar, making it easy to assemble the grating. In addition, it is possible to minimize the number of welding points, which can greatly contribute to the reduction of manufacturing cost, and can reduce distortion due to welding heat. In addition, the outer surface of the end bar can be freed from caulking parts and protrusions, and the outer surface can be formed into a flat surface, so that the appearance of the grating is good and the product quality is improved. In the state where the grating is set in the groove, it is possible to make it difficult to collect foreign matters such as dust in the gap between the outer surface of the end bar and the lid receiving step (vertical wall) of the groove.

  In particular, according to the invention of claim 2, since the protrusion height of the engagement protrusion of each main bar is set smaller than the depth of the engagement hole of the corresponding end bar, the engagement protrusion is formed in the engagement hole. In the inserted state, the end face of each main bar can be brought into contact with the inner side face of the corresponding end bar without fail, thereby eliminating the gap between the end bar and the main bar and improving the assembly accuracy of the grating. Can do.

  In particular, according to the invention of claim 3, on the outer side of the pair of main bars located on both outer sides, there is a pair of side bars that are in contact with the inner side surfaces of the pair of end bars and extend parallel to the main bar. The both end portions of each side bar are welded to the pair of end bars in a state where all the main bars are set between the pair of end bars, so that the assembly workability of the end bars and the main bar is not impaired. The side bars can be accurately assembled, and the main bar can be held and fixed between the end bars by welding and joining the end bars to the end bars.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  In the accompanying drawings, FIGS. 1 to 5 show an embodiment of the present invention, FIG. 1 is a partially broken perspective view showing a setting state of a grating to a drainage groove, and FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a longitudinal sectional view of a main part showing a fitting state between the engaging protrusion and the engaging hole (cross section taken along line 4-4 in FIG. 2). FIG. 5 is an exploded perspective view of the grating.

  First, in FIG. 1, a U-shaped drainage groove P as a groove is recessed in an installation surface F which is indoors or outdoors and hardened with concrete or the like, and both sides of the drainage groove P in the width direction. The left and right side edges of a plurality of gratings G used as water-permeable covers that cover the openings of the grooves P are engaged with and supported by the opening edges of the grooves P. Are arranged in tandem.

  In the illustrated example, a stepped portion that is one step down from the installation surface F is formed at the left and right opening edge portions of the drainage groove P, and a metal edge frame extending along the longitudinal direction of the groove P is formed on the stepped portion. The materials 1 are integrally provided. The edge frame member 1 is configured in a L-shaped cross section by a horizontal wall portion 1b and a vertical wall portion 1a continuously provided at one end thereof.

  Thus, the edge frame material 1 constitutes a lid receiving step portion at the opening edge of the drainage groove P, and an upper surface of this step portion that is lowered by one step from the installation surface F (that is, the upper surface of the horizontal wall portion 1b). Is a lid receiving surface on which both left and right edge portions of the grating G (that is, an end bar E described later) are directly placed and supported. By adopting such a lid receiving structure, the upper surface of the grating G is substantially flush with the installation surface F and forms a walking surface together with the installation surface F.

  Each grating G includes a plurality of parallel main bars M arranged in parallel at a predetermined interval, and the main bars M arranged orthogonally to the main bars M and connecting one end and the other end of the bars M in the longitudinal direction. A pair of parallel end bars E and an outer side of a pair of main bars M positioned on both outer sides are disposed adjacent to each other, both ends abut against the inner side surfaces Ei of the pair of end bars E and extend in parallel with the main bar M. It has a pair of side bars S and has a rectangular frame shape as a whole. And each bar M, S, E is formed with metal materials, such as aluminum and stainless steel which are strong in rust in the example of illustration. Although not shown, spacer means for maintaining a constant interval between the main bars M or between the main bars M and the side bars S is provided as necessary.

  Each main bar M is formed in a T-shaped cross section in the illustrated example and extends linearly in a direction crossing the drainage groove P, and one main bar M facing each of the inner side surfaces Ei of the pair of end bars E. Engagement protrusions Ma in the form of strips that are elongated in the up-down direction are integrally provided at the central portions of the end surface and the other end surface, respectively. The processing of each main bar M is performed by, for example, manufacturing a main bar material having a T-shaped cross section by extrusion or pultrusion, and then cutting each main bar M with a press machine. To form. In addition, an uneven portion for preventing slipping is attached to the upper surface of the upper wall portion in the form of a strip plate of each main bar M as necessary.

  Each side bar S is basically in the shape of a rectangular strip, the cross section is formed in a vertically long rectangular shape, and extends linearly in a direction crossing the drainage groove P, and both end faces thereof correspond. The entire surface is formed as a flat surface so as to abut against the inner surface Ei of the end bar E. Each side bar S is processed by, for example, manufacturing a side bar material having a rectangular cross section by extrusion or pultrusion, and then cutting each side bar S by a press machine.

  Each end bar E is also basically in the shape of a rectangular strip, the cross section is formed in a vertically long rectangular shape and extends in the direction along the longitudinal direction of the drainage groove P, and its lower end is the lid receiving step. Is engaged and placed on the lid receiving surface of the portion (edge frame member 1). A plurality of engagement holes Ea into which the engagement protrusions Ma of the main bar M are respectively fitted and engaged are formed on the inner side surface Ei of each end bar E (that is, the surface facing the main bar M). It is recessed with the same interval as the pitch. The engagement hole Ea is formed in a blind hole shape, that is, a concave hole whose bottom is closed.

  Each end bar E is processed by, for example, manufacturing an end bar material having a rectangular cross section by extrusion or pultrusion, and then cutting each end bar E by a press machine. The engagement hole Ea is processed by, for example, pressing the end bar material or the inner side surface Ei of each end bar E with a press or a roll forming die at predetermined intervals.

  If the depth L ′ of the engagement hole Ea is too deep, a bulge resulting from the pressing process is formed on the outer surface side of the end bar E. Therefore, the depth L ′ is equal to the thickness L of the end bar E. It is desirable to make it 1/2 or less. The protrusion height L ″ of the engagement protrusion Ma of the main bar M is preferably set to be smaller than the depth L ′ of the engagement hole Ea. Since the end surface of each main bar M can be reliably brought into contact with the corresponding inner side surface Ei of the end bar E in a state where Ma is fitted into the engagement hole Ea, the correspondence between the inner side surface Ei of the end bar E and the main bar M Therefore, the end bar E and the main bar M can be framed without any play, and the assembly accuracy of the grating G can be increased.

  A large number of main bars M are arranged at predetermined intervals between the inner side surfaces Ei of the pair of end bars E, and the engaging protrusions Ma at both ends of the main bars M are fitted into the engaging holes Ea of the corresponding end bars E, respectively. In this state, one end and each other end of some main bars M are welded to the inner side surface Ei of the corresponding end bar E, whereby the remaining main bar M is welded to the end bar E. At least it is clamped and fixed between the end bars E at least. The part of main bars M are a part of all the main bars M, and at least two main bars M (one in the illustrated example) are arranged with at least one main bar M interposed therebetween. A plurality of main bars M) arranged at intervals, and only one end and each other end of the main bar M are welded to the inner side surface Ei of the corresponding end bar E, respectively.

  Next, the operation of the embodiment will be described. The drainage that has flowed to the opening edge of the drainage groove P through the installation surface F flows into the drainage groove P through the gaps between the bars M, E, and S in the grating G, and other appropriate discharge through the groove P. The fluid is discharged toward the place.

  When assembling the grating G, a predetermined number of main bars M are aligned between the inner side surfaces Ei of a pair of end bars E parallel to each other so that the main bars M are parallel to each other and perpendicular to the end bars E (this alignment). In this case, a main bar alignment jig (not shown) is used), and the engagement protrusions Ma at both ends of the main bar M are inserted into and engaged with the engagement holes Ea of the corresponding end bars E, respectively. Next, each one end and each other end of a part of the main bars M (a plurality of main bars M arranged every other line in the illustrated example) of all the main bars M are connected to the inner side surface Ei of the corresponding end bar E. In this way, all the main bars M including the main bar M not welded to the end bar E are sandwiched and fixed between the pair of end bars E. After that, the side bar S is interposed between the end bars E outside the outermost main bar M (that is, the one end surface and the other end surface of the side bar S are brought into contact with the inner side surface Ei of the both end bars E). When both ends of the side bar S are welded to the inner side surface Ei of the end bar E from the inside, that is, the side adjacent to the main bar M, the assembly of the grating G is completed.

  Thus, when assembling the grating G, a large number of main bars M are arranged at predetermined intervals between the inner side surfaces Ei of the pair of end bars E, and the engaging protrusions Ma at both ends of the main bars M are arranged on the corresponding end bars E. In a state of being fitted and engaged with the engagement holes Ea, only the both ends of a part of the main bar M are welded to the inner side surface Ei of the end bar E. Since the assembly of the main bar M is completed, the assembling work is simple, and the number of welding points is minimal, and distortion due to welding heat can be reduced. In addition, since the outer surface of the end bar E can be eliminated from the outer surface and the outer surface can be formed into a flat surface, the appearance appearance of the grating G is good and the merchantability is improved. The risk of injury to the operator can be reduced. In addition, with the lower end of the end bar E engaged and placed on the lid receiving step 1 of the drainage groove P and the grating G set in the opening of the drainage groove P, the outer surface of the end bar E and the lid receiving stepped portion It is possible to make it difficult for foreign matters such as dust to collect in the gap between the vertical wall 1a and the vertical wall 1a.

  Further, in the illustrated example, since the welding of the pair of side bars S to the end bar E is performed in a state where the assembly of all the main bars M to the end bar E is completed, the assembly of the end bar E and the main bar M is performed. A pair of side bars S can be assembled accurately without impairing workability, and the main bar M is sandwiched and fixed strength between the end bars E by welding and joining the side bars S to the end bars E. Can be increased.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above embodiment, each bar S, M constituting the grating G is formed from a metal material such as an aluminum material. However, in the present invention, each bar S, M is a high strength synthetic resin material such as FRP. You may make it shape | mold by.

  The cross-sectional shapes of the main bar M, the end bar E, and the side bar S are not limited to those of the above-described embodiments. For example, the main bar M having a rectangular cross-sectional shape, an angle shape, an inverted U-shape, etc. It is possible to use the end bar E and the side bar S having a shape such as an inverted U shape, and the side bar S can be omitted as necessary.

  In the above-described embodiment, the main bars M arranged alternately are shown as some main bars M to be welded to the end bars E among all the main bars M. However, in the present invention, the main bars M are not welded. If the pitch is such that the engagement protrusions Ma of the main bar M are not disengaged from the engagement holes Ea of the end bar E, at least two main bars lined up with two or more predetermined numbers of main bars M interposed therebetween. Only the bar M may be welded. And in this case, the welding location regarding the main bar M can be reduced further.

The partially broken perspective view which shows the set state to the drainage of the grating which concerns on the Example of this invention 2-2 line enlarged sectional view of FIG. 3-3 sectional view of FIG. Main part longitudinal cross-sectional view which shows the fitting state of an engagement protrusion and an engagement hole (4-4 sectional view taken on the line of FIG. 2) Exploded perspective view of grating

Explanation of symbols

E ... End bar Ei ... Inner side surface Ea ... Engagement hole G ... Grating L '... Engagement hole depth L "... Engagement protrusion protrusion height P ... Drainage groove M as groove ... Main bar Ma ... engagement projection S ... side bar w, w '... welding

Claims (4)

A plurality of parallel main bars (M) that are parallel to each other at a predetermined interval, and a pair of parallel end bars (E) that connect between one end and the other end of each main bar (M). In the grating used as a water-permeable lid that covers at least the opening of the groove (P),
Engaging protrusions (Ma) are integrally formed on one end surface and the other end surface of each main bar (M) facing the inner side surfaces (Ei) of the pair of end bars (E), respectively, while each end bar (E) On the inner side surface (Ei), a plurality of blind hole-like engagement holes (Ea) into which the engagement protrusions (Ma) of the plurality of main bars (M) are respectively fitted and engaged are recessed at the predetermined interval. Set up
One end and each other end of at least two main bars (M) which are a part of all main bars (M) and are arranged with at least one main bar (M) sandwiched between them. Grating characterized by welding (w) to the inner side surface (Ei) of the corresponding end bar (E).   The protrusion height (L ″) of the engagement protrusion (Ma) of each main bar (M) is set smaller than the depth (L ′) of the engagement hole (Ea) of the corresponding end bar (E). Thus, when the engagement protrusion (Ma) is fitted in the engagement hole (Ea), the end surface of each main bar (M) is surely brought into contact with the inner surface (Ei) of the corresponding end bar (E). The grating according to claim 1, wherein the grating is formed. On the outside of the pair of main bars (M) located on both outer sides, a pair of side bars that are in contact with the inner side surfaces (Ei) of the pair of end bars (E) and extend in parallel with the main bars (M) (S) is arranged,
Both end portions of each side bar (S) are welded (w ′) to the pair of end bars (E) in a state where all the main bars (M) are set between the pair of end bars (E). The grating according to claim 1, wherein the grating is characterized. The assembly method of the grating according to any one of claims 1 to 3,
A plurality of main bars (M) are arranged between the inner side surfaces (Ei) of a pair of end bars (E) parallel to each other so that the main bars (M) are arranged in parallel to each other and are orthogonal to the end bars (E). And engaging the engagement protrusions (Ma) of the main bars (M) with the engagement holes (Ea) of the corresponding end bars (E),
Next, each one end and each other end of at least two main bars (M) that are a part of all the main bars (M) and are arranged with at least one main bar (M) interposed therebetween. The parts are welded (w) to the inner side surface (Ei) of the corresponding end bar (E), and the unwelded main bar (M) is sandwiched and fixed between the pair of end bars (E). Assembling method of grating.

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