BE732727A - - Google Patents

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Publication number
BE732727A
BE732727A BE732727DA BE732727A BE 732727 A BE732727 A BE 732727A BE 732727D A BE732727D A BE 732727DA BE 732727 A BE732727 A BE 732727A
Authority
BE
Belgium
Prior art keywords
profiled
sheet
light beam
longitudinal
parts
Prior art date
Application number
Other languages
French (fr)
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 filed Critical
Publication of BE732727A publication Critical patent/BE732727A/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2409—Hooks, dovetails or other interlocking connections
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2415—Brackets, gussets, joining plates
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2448—Connections between open section profiles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B2001/2466—Details of the elongated load-supporting parts
    • E04B2001/2475—Profile with an undercut grooves for connection purposes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B2001/2481—Details of wall panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/388—Separate connecting elements
    • E04B2001/389—Brackets
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0421—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/043—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/0439—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the cross-section comprising open parts and hollow parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0452—H- or I-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rod-Shaped Construction Members (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  "Poutre profilée en tôle pour la construction." 
Les constructeurs connaissent bien les problèmes inhérents à l' utilisation des poutres traditionnelles laminées à froid ou à chaud ou des poutres en treillis, tant en ce qui concerne leur conception que leur fabrication à l'atelier. 



   Ces problèmes sont inévitables étant donné que les poutres ainsi que les éléments qui servent à les construire, dans le cas des pou- tres en treillis, sont des produits bruts de fabrication. 



   Le poids très élevé de ces poutres nécessite souvent une main d'oeuvre nombreuse et des dispositifs appropriés de levage, qui grè- vent sensiblement le coùt du transport. D'autre part, les profils li- vrés en longueurs normalisées posent un problème de chutes dont lien- 

 <Desc/Clms Page number 2> 

 ploi se fait fréquemment à long terne,   @     @     @   
Il est également nécessaire d'appliquer aux profils mormaux um travail préparatoire difficile : il faut les couper à la longueur dé- sirée, les usiner, leur souder les équerres ou goussets pour les di- vers assemblages et fixations, etc. 



   La poutre   profilte   qui fait l'objet de la présente invention ap- porte une solution simple, sûre et économique à tous ces problèmes et en outre, elle présente l'avantage d'éliminer complètement l'appli- cation de la protection anticorrosive obligatoire, étant donné que. étant profilée à froid sous forme continue à partir de tale galvani- sée, elle est livrée directement sur le chantier, coupée à la longueur adéquate, sans chute, donc prête à être utilisée. 



   En son essence, la poutre profilée en 1 destinée à la   construc-   tion et dont il s'agit est caractérisée par le fait que l'aile supé- rieure horizontale est constituée par une portion prismatique crème de section sensiblement rectangulaire dont la face supérieure comporte une rainure longitudinale de section trapézoïdale conçue pour   l'encas-   trement de pièces en queue d'aronde, tandis que l'aile inférieure ho- rizontale, constituée également par une portion prismatique creuse de section sensiblement rectangulaire, comporte à sa face inférieure une fente longitudinale déterminée par l'écartement des bords longitu- dinaux de la rôle à partir de laquelle on a formé, par pliage, la pou- tre profilée. 



   D'autres caractéristiques et avantages de la poutre en question apparaîtront dans la description ci-après qui se réfère aux dessins annexés qui illustrent, à titre d'exemple non limitatif, un mode d' exécution. 



   La fig. 1 est une vue schématique du profil de la poutre. 



   La fig. 2 est une vue em élévation latérale et à plus petite échelle d'une poutre fixée sur des éléments de structure au moyen de plaquettes appropriées. 



   Les fies. 3 et 4 montrent chacune en perspective la fixation d' une échantignolle ou d'une panne sur l'aile supérieure de la poutre au moyen d'un cavalier coulissant. 



   Les figs. 5 et 6 montrent, respectivement en élévation frontale 

 <Desc/Clms Page number 3> 

 et en perspective, l'encastrement   dans   l'aileinférieure de la poutre 
 EMI3.1 
 . , > , ,¯ .., >, ,, d'un élément de cloison'ou'panàeau de fermeture mobile ou fixe.-.."'\o: .t':" 
Les figs. 7 et 8 montrent, respectivement en élévation frontale et en perspective, la fixation d'un élément de plafond dans l'aile inférieure de la poutre au Moyen d'un support ou plaquette coulissant. 



   La poutre dont il s'agit comporta dans son aile supérieure 1 une rainure longitudinale 2 à section trapézoïdale, conçue pour l'encas- trement de pièces en queue d'aronde et/ou pour recevoir des matériaux de construction tels que du béton. 



   L'aile inférieure 3 est munie d'une fente longitudinale 4 déter- minée par l'écartement des bords 5 de la tôle à partir de laquelle om a formé, par pliage, la poutre profilée. 



   Cette fente longitudinale est conçue pour recevoir le bord sapé- rieur 6 d'un panneau de séparation 7 et pour recevoir une plaquette de fixation 8 d'un élément de plafond 9, la plaquette 8 s'appuyant sur les ailettes horizontales 10 dont les bords 5 déterminent la fen- te longitudinale 4. 



   L'âme centrale 11 de la poutre est constituée par deux portions verticales adjacentes de la tôle qui constitue la poutre profilée. 



   Dans l'interstice qui reste entre les deux portions verticales constituant l'âme 11, on peut introduire une plaquette de soutien 12 conçue pour fixer l'extrémité correspondante de la poutre à l'élément respectif de structure 13. 



   Les pannes 14 se fixent sur la partie supérieure 1 de la poutre au moyen des équerres 15 munies de cavaliers 16 par exemple en queue d'aronde (fig. 3) ou bien directement au moyen de ces cavaliers 16 (fig. 4). 



   Il est entendu que tout ce qui ne modifie pas l'essentiel de la poutre profilée de construction décrite peut être sujet à des va- riantes de détail.



   <Desc / Clms Page number 1>
 



  "Sheet metal profiled beam for construction."
Builders are well aware of the problems inherent in using traditional cold-rolled or hot-rolled beams or lattice girders, both in design and in shop fabrication.



   These problems are inevitable since the beams and the elements used to construct them, in the case of lattice beams, are as manufactured products.



   The very heavy weight of these beams often requires a great deal of labor and suitable lifting devices, which significantly reduce the cost of transport. On the other hand, the profiles delivered in standard lengths pose a problem of offcuts, which link-

 <Desc / Clms Page number 2>

 job is frequently done long term, @ @ @
It is also necessary to apply difficult preparatory work to the abnormal profiles: they must be cut to the desired length, machined, welded to them the brackets or gussets for the various assemblies and fixings, etc.



   The profiled beam which is the object of the present invention provides a simple, safe and economical solution to all these problems and, moreover, it has the advantage of completely eliminating the application of the obligatory anticorrosive protection, given that. being cold rolled in continuous form from galvanized sheet metal, it is delivered directly to the job site, cut to the correct length, without scraps, therefore ready for use.



   In essence, the 1-shaped beam intended for construction and in question is characterized by the fact that the horizontal upper wing is constituted by a cream prismatic portion of substantially rectangular section, the upper face of which comprises a longitudinal groove of trapezoidal section designed for the embedding of dovetail parts, while the horizontal lower wing, also constituted by a hollow prismatic portion of substantially rectangular section, has a slot on its lower face longitudinal determined by the spacing of the longitudinal edges of the roll from which the profiled beam was formed by folding.



   Other characteristics and advantages of the beam in question will appear in the description below which refers to the appended drawings which illustrate, by way of non-limiting example, one embodiment.



   Fig. 1 is a schematic view of the profile of the beam.



   Fig. 2 is a side elevational view on a smaller scale of a beam fixed to structural elements by means of suitable plates.



   The fies. 3 and 4 each show in perspective the attachment of a sample or a purlin on the upper flange of the beam by means of a sliding jumper.



   Figs. 5 and 6 show, respectively in front elevation

 <Desc / Clms Page number 3>

 and in perspective, the embedding in the lower wing of the beam
 EMI3.1
 . ,>,, ¯ ..,>, ,, of a partition element 'or' movable or fixed closing panel .- .. "'\ o: .t':"
Figs. 7 and 8 show, respectively in front elevation and in perspective, the fixing of a ceiling element in the lower flange of the beam by means of a support or sliding plate.



   The beam in question had in its upper flange 1 a longitudinal groove 2 with a trapezoidal section, designed for the embedding of dovetail parts and / or for receiving construction materials such as concrete.



   The lower wing 3 is provided with a longitudinal slot 4 determined by the distance between the edges 5 of the sheet from which om has formed, by bending, the profiled beam.



   This longitudinal slot is designed to receive the sapphire edge 6 of a separation panel 7 and to receive a fixing plate 8 of a ceiling element 9, the plate 8 resting on the horizontal fins 10 whose edges 5 determine the longitudinal window 4.



   The central web 11 of the beam is formed by two adjacent vertical portions of the sheet which constitutes the profiled beam.



   In the gap which remains between the two vertical portions constituting the core 11, it is possible to introduce a support plate 12 designed to fix the corresponding end of the beam to the respective structural element 13.



   The purlins 14 are fixed to the upper part 1 of the beam by means of the brackets 15 provided with jumpers 16, for example dovetailed (fig. 3) or else directly by means of these jumpers 16 (fig. 4).



   It is understood that anything which does not modify the essential part of the profiled construction beam described may be subject to variations in detail.

Claims (1)

REVENDICATIONS 1.- Poutre légère profilée pour la construction caractérisée en ce qu'elle est obtenue par pliage à froid d'une tôle galvanisée de telle façon que la section de la poutre ait la forme générale d'un I, les bords latéraux de la tôle se trouvant à la partie inférieure de l'I. CLAIMS 1.- Light beam profiled for construction characterized in that it is obtained by cold bending of a galvanized sheet such that the section of the beam has the general shape of an I, the side edges of the sheet located at the bottom of the I. 2. - Poutre légère profilée en 1 réalisée en tôle pliée, caractérisée en ce que les ailes supérieure et inférieure horizontales de l'I sont form6es chacune par une portion creuse de section sensiblement rectangulaire. 2. - Light beam profiled in 1 made of folded sheet metal, characterized in that the upper and lower horizontal flanges of the I are each formed by a hollow portion of substantially rectangular section. 3. - Poutre légère profilée en 1 selon 1 et 2, caractérisée en ce que l'âme verticale de la poutre est constituée par deux portions verticales adjacentes de la tôle qui constitue la poutre. 3. - Light beam profiled in 1 according to 1 and 2, characterized in that the vertical web of the beam is formed by two adjacent vertical portions of the sheet which constitutes the beam. 4. - Poutre légère en tôle profilée en I, dont l'aile supérieure creuse est caractérisée en ce que sa face supérieure comporte une rainure longitudinale de section de préférence trapézoïdale conçue pour l'encastrement de pièces en queue d'aronde ou la retenue de tout autre élément de construction, y compris le béton. 4. - Light beam in profiled sheet I, whose hollow upper flange is characterized in that its upper face has a longitudinal groove of preferably trapezoidal section designed for the embedding of dovetail parts or the retention of any other construction element, including concrete. S.- Poutre légère en tôle profilée en I dont l'aile inférieure creuse est caractérisée en ce que sa face inférieure comporte une fente longitudinale déterminée par les bords longitudinaux de la tôle à partir de laquelle on a formé, par pliage, la poutre profilée. é.- Poutre légère en tôle profilée en I selon 5, caractérisée en ce que la fente longitudinale inférieure est conçue pour permettre la reterne de pièces, soit directement par encastrement de la bordure d'un panneau, soit par l'intermédiaire d'une plaquette de fixation introduite à l'intérieur de la partie creuse, la dite plaquette s'appuyant sur les ailettes horizontales dont les bords déterminent la fen te longitudinale et pouvant servir à la fixation d'un plafond. S. - Light beam in I-shaped profiled sheet whose hollow lower flange is characterized in that its lower face has a longitudinal slot determined by the longitudinal edges of the sheet from which the profiled beam was formed by bending . é.- Light beam in profiled sheet I according to 5, characterized in that the lower longitudinal slot is designed to allow the reterne parts, either directly by embedding the edge of a panel, or by means of a fixing plate introduced inside the hollow part, said plate resting on the horizontal fins whose edges determine the longitudinal window and can be used for fixing a ceiling. 7.- poutre légère profilée en 1 selon 1 à 6 coupée de la longueur désirée et :nie à chacune de ses extrémités d'une plaquette de soutien glissée partiellement et fixée entre les deux parties verticales constistant l'âme de la tôle pliée en I de telle manière que la poutre <Desc/Clms Page number 5> puisse être facilement assemblée avec les autres éléments de l'ossatu- re de la construction. 7.- light beam profiled in 1 according to 1 to 6 cut to the desired length and: denies at each of its ends a support plate partially slipped and fixed between the two vertical parts constituting the web of the sheet folded in I in such a way that the beam <Desc / Clms Page number 5> can be easily assembled with the other elements of the construction frame. 8.- Poutre légère profilée en I selon 1 à 7 caractérisée en ce qu'elle est prête à l'emploi sans usinage particulier et sans adjonc- tion de pièces supplémentaires pour fixation sur elle des éléments de toiture, cloisons, plafonds. 8.- I-shaped light beam according to 1 to 7, characterized in that it is ready for use without special machining and without the addition of additional parts for fixing roof elements, partitions, ceilings on it.
BE732727D 1969-05-08 1969-05-08 BE732727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE732727 1969-05-08

Publications (1)

Publication Number Publication Date
BE732727A true BE732727A (en) 1969-11-10

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ID=3854720

Family Applications (1)

Application Number Title Priority Date Filing Date
BE732727D BE732727A (en) 1969-05-08 1969-05-08

Country Status (1)

Country Link
BE (1) BE732727A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766905A1 (en) * 1997-07-11 1999-02-05 Placoplatre Sa Folded section girder for building construction
CN111549650A (en) * 2020-04-25 2020-08-18 上海洪铺钢结构工程有限公司 Steel structure bridge and machining process thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766905A1 (en) * 1997-07-11 1999-02-05 Placoplatre Sa Folded section girder for building construction
CN111549650A (en) * 2020-04-25 2020-08-18 上海洪铺钢结构工程有限公司 Steel structure bridge and machining process thereof

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