JP4989910B2 - Manufacturing method of member constituting girder, manufacturing method of girder, girder manufactured by this manufacturing method, and construction method of structure having girder manufactured by this manufacturing method - Google Patents

Description

  The present invention relates to a girder used in a civil engineering / building structure and a method for manufacturing the girder.

  Generally, steel girders used for structures such as bridges and buildings are manufactured in a factory in a state of being divided in advance so as to have a length and weight that can be transported to an installation site. For example, as shown in FIGS. 6 and 7, the divided member is composed of a web 4 and a flange 3, and bolt holes for joining adjacent members are drilled at both ends of the web 4. Bolt holes for joining adjacent members are drilled in both end faces (FIG. 6), or a weld groove is processed (FIG. 7). Many of these members have the same shape for one structure.

  These members are manufactured by the following procedure. First, the attachment position of the web 4 is marked on the flange 3, and bolt holes are drilled with a drill or the like at both ends of the gas-cut flange 3, or a welding groove is taken. Next, the positions of the bolt holes and the like are marked on the web 4 and the bolt holes are drilled with a drill or the like. The flange 3 and the web 4 are manufactured by, for example, assembling the flange 3 and the web 4 into an H shape, for example, and then performing temporary welding while the flange 3 and the web 4 are turned upside down. The drilling of the bolt holes may be performed before or after the flange 3 and the web 4 are assembled.

  These members are preliminarily assembled at the factory before being shipped to the installation place, and quality inspections such as measurement of shapes and dimensions when assembling a plurality of members and confirmation of the joining state between the members are performed. . However, the work of temporarily assembling and inspecting the quality at the factory has a problem that it requires a lot of manpower and takes time and labor, and the manufacturing cost increases.

Thus, for example, Patent Document 1 discloses a method in which the manufacturing error of each member is managed within a certain value and the temporary assembly is omitted. In this method, the dimensions of each member are measured and compared with the design value.If the error is not within the allowable value, correction or production is performed again, and if the error is within the allowable value, the measurement result is used as a temporary measure. The assembly simulation is executed on a computer to confirm the quality of the shape, dimensions, and joining state between the members at the time of assembly.
JP-A-10-77609

  However, in the method of manufacturing a large number of members and assembling them at the installation site, a series of operations such as ruled lines, tacking, and welding must be repeated for the number of members to be manufactured, and the number of times of handling for manufacturing the members is increased. Due to the extremely large number, there is a problem that manpower and time are required and production efficiency is poor.

  In addition, since the method described in Patent Document 1 requires creation and management of production information such as production errors, input of production information and confirmation of dimensions at the time of each work such as ruled sheets, tacking, and welding. There was a problem that the effort of.

Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to reduce the number of times of repeating a series of operations such as ruled lines, tacking, and welding, and to produce a high-precision girder. It is an object to provide a method of manufacturing a member constituting a girder that can be performed, a method of manufacturing a girder, a girder manufactured by the manufacturing method, and a method of constructing a structure including the girder.

In order to achieve the above object, a method for manufacturing a girder according to the present invention is a method for producing a member comprising a flange and a web, wherein the flange and a plurality of webs are assembled into a predetermined shape, And a dividing step of dividing the beam into a plurality of members respectively corresponding to the plurality of webs (first invention).

According to the method for manufacturing a member constituting a girder according to the present invention, a flange, a plurality of webs are assembled into a predetermined shape, and a girder of a predetermined length is manufactured, such as ruled lines, tacking, welding, etc. It is possible to reduce the number of times of a series of operations, and to greatly reduce the labor and time of production. Therefore, it is possible to shorten the girder manufacturing period.
In addition, it can be easily transported to the installation place in order to cut the flange for each length of the web so that the predetermined length of the digit corresponds to each of the plurality of webs and to divide the web into a plurality of members. Become.

The second invention is characterized in that, in the first invention, the flange and the web are welded without welding the adjacent webs in the manufacturing step.
According to the method for manufacturing a member constituting a girder according to the present invention, when assembling a flange and a web at a factory, the flange and the web are welded, and adjacent webs are not welded. It becomes possible.

A third invention is characterized in that, in the first or second invention, in the dividing step, division is performed at a boundary between the adjacent webs, and only the flange is cut.
According to the manufacturing method of the member which comprises the girder by this invention, what is necessary is just to cut | disconnect only a flange by dividing | segmenting a girder at the boundary of adjacent webs which are not welded. Therefore, the cutting machine may be smaller than when the adjacent webs are welded, and the labor for cutting is small, so that the cutting cost can be reduced and the construction period can be shortened.

A fourth invention is, more to the first invention, the step of fabricating the member that constitutes the digits, and transportation process for transporting the member to installed the installation place of the digit of the member at the location the flanges each other and joined with through welding or flange spliced plate bolts, a method of fabricating a girder, characterized in that to obtain Bei a flange joining step of joining the flanges with each other of said members.
According to the method for manufacturing a girder according to the present invention, the flanges of the members that have been cut and divided are joined together by welding or bolts via flange attachment plates, thereby causing errors in the angle of the cut surface, misalignment of the joint surface, etc. Does not occur. Therefore, no problems occur when assembling at the installation location. Furthermore, since an operation for correcting an error or the like does not occur, the shape at the time of assembly can be easily obtained, and the flanges can be easily joined in a short time.

5th invention WHEREIN: In 4th invention, the web joining process of joining the webs of the said member with a volt | bolt via welding or a web attachment board in the said installation place, and joining the webs of the said member. Is further provided.
According to the method for manufacturing a girder according to the present invention, the webs of the members are joined together by welding or bolts via a web attachment plate, so that errors such as angle errors of the cut surfaces and deviations of the joint surfaces do not occur. Therefore, no problems occur when assembling at the installation location. Furthermore, since an operation for correcting an error or the like does not occur, the shape at the time of the assembly operation can be easily obtained, and the webs can be easily joined in a short time.

According to a sixth aspect of the present invention, the method according to the first aspect further comprises an inspection step for inspecting specifications such as the shape and dimensions of the girders after the manufacturing step, and if the result of the inspection is good, the dividing step is performed. If the result of the inspection is defective, the digit is corrected or remanufactured, and the inspection process is performed again.
According to the method for producing a member constituting a girder according to the present invention, when a girder of a predetermined length is produced, when a plurality of members are assembled in order to perform quality inspection such as shape and dimensions at the time of assembly. In comparison, provisional assembly and quality inspection before shipping can be omitted. In the quality inspection, the accuracy can be controlled with one member before cutting, and a predetermined shape can be obtained with high accuracy when reassembling a plurality of members at the installation site.

  A girder according to a seventh aspect of the present invention is a girder composed of a flange and a web, wherein a girder of a predetermined length produced by assembling a flange and a plurality of webs into a predetermined shape is adjacent to the web. A plurality of members cut at the boundary between each other are joined at the place where the beam is installed.

  In an eighth aspect based on the seventh aspect, the flange of the predetermined length manufactured by assembling is welded to the flange and the web without welding the adjacent webs to each other. Features.

A structure according to a ninth aspect of the present invention is a method for constructing a structure having a girder composed of a flange and a web, and has a predetermined length manufactured by assembling the flange and a plurality of webs into a predetermined shape. A plurality of members are manufactured by cutting the spar at the boundary between the adjacent webs ,
The girder is constructed by joining the plurality of manufactured members at a place where the girder is installed.

By using the method for manufacturing a member constituting the girder of the present invention, it is possible to manufacture a highly accurate member with a small number of work steps. Also, by using the members manufactured by this manufacturing method, there is no need to modify the members at the time of on-site assembly, a highly accurate shape can be obtained efficiently in a short time, and a high-precision girder is installed on the site. It becomes possible to do.

  Hereinafter, a preferred embodiment of a method for manufacturing a girder according to the present invention will be described in detail with reference to the drawings. For convenience of understanding the invention, in the following embodiment, a method of using a girder for a bridge will be described, but the present invention is not limited to this, and can be used for a beam, a pillar, or the like of a structure. .

FIG. 1a is a perspective view showing a state in which the stringer according to the first embodiment of the present invention is assembled in a factory, and FIG. 1b is a cross-sectional view taken along line AA ′ of FIG. 1a. As shown in FIGS. 1a and 1b, the girder 1 includes a plurality of webs 4 arranged in the longitudinal direction of the bridge, and a plurality of webs joined to the upper and lower edges of the web 4 and joined in the longitudinal direction of the bridge. This is an H-shaped steel girder composed of a flange 3 having substantially the same length as the entire length of the web 4. In addition, the web splicing plate 2 used in the manufacturing process of the girder 1 at the factory is indicated by a two-dot chain line.
Below, the manufacturing method of this cross girder 1 is demonstrated.

FIG. 2 is an enlarged view of a joint portion between the webs 4 according to the present embodiment.
First, bolt holes for attaching the web attachment plate 2 to both end surfaces of the web 4 are drilled. Then, the attachment position of the web 4 is marked on the flange 3.

  Next, the adjacent webs 4 are joined to each other by bolts via the web attachment plate 2, the web 4 and the flange 3 are assembled into an H shape with a crane or the like, and the web 4 and the flange 3 are temporarily attached. Later, continuous welding is performed. The continuous welding is performed while moving the positions of the web 4 and the flange 3 by using a reversing device that rotates and moves the web 4 and the flange 3 integrally so that the automatic welding machine can be welded. Thus, the girder 1 having the same predetermined length as that assembled in the installation place is manufactured at the factory.

  The girder 1 manufactured to a predetermined length is subjected to quality inspection such as measurement of shape and dimensions. The shape and dimensions are measured and compared with the design value. If the error is not within the allowable value, correction or production is performed again. If the error is within the allowable value, the girder 1 is placed on the plurality of webs 4 respectively. Correspondingly, the flange 3 is cut at the boundary between the adjacent webs 4 to divide the girder 1 into a plurality of members. Specifically, in order to prevent the occurrence of elongation, distortion, etc. of the flange 3 at the boundary between adjacent webs 4, be careful not to apply heat and load as much as possible, and only the flange 3 with an electric cutter or the like. Cut and split. And the welding groove | channel is processed by gas cutting on the both end surfaces of the flange 3 of each divided member.

  Next, each member is transported by truck, ship or the like to the installation place where the girder 1 is installed, and at this installation place, as shown in FIG. Are assembled with a bolt through the web attachment plate 2 to assemble the girder 1.

  According to the manufacturing method of the cross girder 1 of the present embodiment described above, first, the flange 3 and the plurality of webs 4 are assembled into an H shape to manufacture the cross girder 1 having a predetermined length. As compared with the case where a series of operations such as ruled lines, tacking, welding, etc. are repeated for the number of members to be manufactured, it is only necessary to perform these series of operations once, so that the labor and time of production are greatly reduced. This makes it possible to shorten the manufacturing period of the girder 1. In addition, when the girder 1 is manufactured, it is possible to omit assembly and quality inspection of a plurality of members in order to perform quality inspections such as shape and dimensions during assembly. And since the spatula 1 is cut | disconnected and divided | segmented into a some member, it can be easily conveyed to an installation place.

  And when assembling the flange 3 and the web 4 in a factory, since the flange 3 and the web 4 are welded and adjacent webs 4 are not welded, it becomes possible to reduce manufacturing cost.

  Further, the cutting of the cross beam 1 may be performed by cutting only the flange 3 by dividing the cross beam 1 at the boundary between the adjacent webs 4 for each length of the web 4. Therefore, the cutting machine can be small-scale compared with the case where it is manufactured with a single web 4 and the labor for cutting is small, so that the cutting cost can be reduced and the construction period can be shortened. It becomes.

  In addition, when the girder 1 having a predetermined length is manufactured, if quality inspections such as shape and dimensions at the time of assembly are not good, in order to correct or remanufacture multiple parts separately Compared to the above, it is possible to manufacture a high-quality girder 1.

  When assembling the girder 1 at the installation location of the girder 1, the flanges 3 of the respective members that have been cut and divided are joined to each other with bolts via welding or flange attachment plates 5, and the web 4 of each member. Since the web adjoining plates 2 may be joined to each other, errors such as an angle error of the cut surface and a deviation of the joint surface do not occur. Therefore, no problems occur when assembling at the installation location. Further, since there is no work for correcting errors and the like, the assembly work is not wasted, and the flanges 3 can be easily joined in a short time.

  In addition, in this embodiment, although the method of joining the flanges 3 by welding was demonstrated, it is not limited to this, As shown in FIG. 4, it is bolted via the flange attachment plate 5. You may join.

  In the present embodiment, the method of joining the webs 4 with the bolts via the web attachment plate 2 at the installation place of the spatula 1 has been described. However, the present invention is not limited to this. May be joined by welding.

  Further, in the present embodiment, the method of joining the webs 4 with bolts via the web attachment plate 2 at the time of manufacture in the factory has been described. This is because the web 4 and the flange 3 are continuously welded in the factory. When the web 4 and the flange 3 are rotated / moved, the web 4 and the flange 3 may be welded without using the web attachment plate 2.

  In the present embodiment, the girder 1 having an H-shaped cross-sectional shape has been described. However, the present invention is not limited to this, and the present invention can be applied to girders having various shapes such as an I shape and a box shape. 5. For example, as shown in FIG. 5, a box-shaped box girder includes a plurality of webs 4 arranged in parallel in the longitudinal direction of the bridge and a web attachment plate for connecting adjacent webs 4 to each other. 2, flanges 3 joined to the upper and lower edges of the web 4 arranged in parallel and connected to each other in the longitudinal direction of the bridge, and a reinforcement for preventing deformation of the box girder It is a square steel composed of the material 6. The box girder is manufactured in the following procedure. First, similarly to the saddle beam 1, adjacent webs 4 are joined by bolts via the web attachment plate 2 instead of welding. Next, the web 4 and the flange 3 are assembled into a box shape, and a box girder having a predetermined length that is the same as that installed in the field is manufactured. Then, similarly to the saddle beam 1, the web attachment plate 2 is removed, and only the flange 3 is cut with an electric cutter or the like at the boundary between the adjacent webs 4 to divide the box beam. Each divided member is transported to the installation location, and the flange 3 of each member is welded at the installation location, and the box 4 is joined by joining the webs 4 with the bolts via the web attachment plate 2. assemble.

  Moreover, in this embodiment, although the method using a steel material as a material of the girder 1 was demonstrated, it is not limited to this, What is necessary is just a material which can be used as building materials, such as aluminum and a plastics.

It is a perspective view which shows the state which assembled the stringer concerning 1st embodiment of this invention in the factory. It is A-A 'sectional drawing of FIG. 1a. It is the figure which expanded the junction part of the webs which concern on this embodiment. It is a perspective view which shows the state which assembled the girder concerning this embodiment in the installation place. It is a figure which shows the other joining method of the flanges which concern on this embodiment. It is a perspective view which shows the other shape of the beam which concerns on this embodiment. It is a perspective view which shows an example of the junction part in the conventional girder. It is a perspective view which shows another example of the junction part in the conventional girder.

Explanation of symbols

1 Girder 2 Web splicing plate 3 Flange 4 Web 5 Flange splicing plate 6 Reinforcing material

Claims (9)

In the manufacturing method of the member which comprises the girder comprised from a flange and a web,
A production process for assembling a flange and a plurality of webs into a predetermined shape and manufacturing a girder of a predetermined length;
Production method of members constituting the digit, characterized in that it comprises a dividing step of dividing該桁into a plurality of members corresponding to each of the plurality of webs. The method for manufacturing a member constituting a girder according to claim 1, wherein, in the manufacturing step, the flange and the web are welded without welding the adjacent webs. 3. The method for manufacturing a member constituting a girder according to claim 1, wherein in the dividing step, division is performed at a boundary between adjacent webs, and only the flange is cut. Producing a member constituting a beam by the method according to claim 1;
A transporting process for transporting the manufactured member to an installation place where the beam is installed;
Joined at the location at via welding or flange bears against plate flanges together of the members bolts, fabrication of digits, characterized in that to obtain Bei a flange joining step of joining the flanges with each other of said members Method.   5. The web joining step of joining the webs of the members at the installation location with bolts via welding or web attachment plates and joining the webs of the members together. The manufacturing method of the described girder. After the manufacturing process, further comprising an inspection process for inspecting specifications such as the shape and dimensions of the beam,
If the result of the inspection is good, carry out the dividing step,
The method for manufacturing a member constituting a beam according to claim 1, wherein if the inspection result is defective, the beam is corrected or remanufactured and the inspection process is performed again. A girder composed of a flange and a web,
A plurality of members formed by assembling a flange and a plurality of webs into a predetermined shape and cutting a girder of a predetermined length at the boundary between the adjacent webs are joined at the installation location of the girder Digit characterized by being configured.   The girder according to claim 7, wherein the girder of a predetermined length produced by assembling is welded to the flange and the web without welding the adjacent webs to each other. A construction method of a structure having a girder composed of a flange and a web,
A plurality of members are manufactured by cutting a predetermined length girder manufactured by assembling a flange and a plurality of webs into a predetermined shape at the boundary between the adjacent webs ,
A construction method for a structure, wherein the girders are constructed by joining the produced members at the place where the girders are installed.

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