JP7295731B2 - Beam formation method and erection method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a beam forming method for forming a beam with a camber, and a construction method.

The beams that make up the column-beam frame of a building are generally curved in the opposite direction in consideration of the fact that the central part in the longitudinal direction will bend downward due to gravity after construction. Patent Literature 1 discloses a method of forming a beam by bending a steel frame beam by hot rolling (hot bending).

Japanese Patent Publication No. 53-018981

In the case of the beam forming method of Patent Document 1, since hot rolling (hot bending) is an expensive processing method, there is a problem that the manufacturing cost of the beam increases. Another problem is that it is difficult to process a large beam with a large cross-section in hot rolling equipment for hot rolling. By the way, it is conceivable to bend the steel beams by cold bending to form the bulges, but in that case, it is difficult to form the bulges precisely.

In view of this situation, the main object of the present invention is to provide a beam that can be curved with high accuracy at low cost and that can easily be curved even for a large beam with a large cross section. The point is to provide a forming method.

A first characteristic configuration of the present invention is a beam forming method for forming a bulging beam,
When forming the beam by connecting a plurality of beam members having the same beam height in the length direction, a plurality of substantially horizontal beam members are arranged such that the beam member arranged closer to the center in the length direction is positioned higher. A plurality of substantially horizontal beam members are connected stepwise by providing a level difference at the connection points .

According to this configuration, by providing a stepwise difference in level at the connection points (joint points) of a plurality of beam members having the same beam height, it is possible to accurately bulge the beam at low cost. In addition, since processing equipment for bending is not required, it is possible to easily form a bulge on a beam with a large cross-section.

According to a second characteristic configuration of the present invention, the beam formation method described in the first characteristic configuration is performed in a construction step of constructing a column-beam frame by assembling columns and the beams.

According to this configuration, when the beam is constructed in the erection process, the beam can be curved by giving a level difference to the plurality of beam members. manufacturing cost can be reduced.

A third characteristic configuration of the present invention is that, in the erection process, the plurality of beam members for forming the plurality of beams are installed at the same installation level from the side with the lower installation level toward the side with the higher installation level. There is a point to attach in order.

According to this configuration, since a plurality of beam members for forming a plurality of curved beams are attached to each beam member of the same installation level from the lower installation level side with good workability, the installation levels are different. Construction work for assembling a plurality of beam members can be efficiently performed.

According to a fourth characteristic configuration of the present invention, in forming a beam with a bulge by connecting a plurality of beam members having the same beam thickness in the length direction, the beam members arranged closer to the center in the length direction are arranged upwardly. A construction method in which a beam formation method for connecting a plurality of beam members by giving a level difference so as to be positioned at is performed in a construction process for constructing a column-beam frame by assembling columns and the beams,
The plurality of beam members are made of H-shaped steel having flanges on the top and bottom of the web,
In the erection step, connecting the plurality of beam members by giving the level difference,
A first filler plate is superimposed on the upper surface of the flange of the beam member on the lower installation level side at the joint locations of the plurality of beam members, and the lower surface of the flange of the beam member on the higher installation level side is arranged. A second filler plate having the same thickness as the first filler plate is placed on top of the first filler plate, and in the arrangement state, the flange of the beam member on the side with the lower installation level and the flange of the beam member on the side with the higher installation level are fixed by sandwiching them with upper and lower splice plates that straddle the flanges.

According to this configuration, by providing a stepwise difference in level at the connection points (joint points) of a plurality of beam members having the same beam height, it is possible to accurately bulge the beam at low cost. In addition, since processing equipment for bending is not required, it is possible to easily form a bulge on a beam with a large cross-section.
In addition, according to this configuration, when constructing the beams in the erection process, it is possible to provide a plurality of beam members with a difference in level so that the beams can be rounded. Therefore, the manufacturing cost of the beam can be reduced.
Furthermore, according to this configuration, the pair of flanges to be connected is sandwiched between the upper and lower splice plates with the first and second filler plates interposed at the joints of the plurality of beam members, thereby forming the plurality of beam members. can be easily connected with a level difference.

Side view schematically showing a beam forming method A side view showing a connection point (joint point) of a beam member Beam plan showing the overall steps of the erection process

An embodiment of a construction method employing the beam forming method of the present invention will be described with reference to the drawings.
FIG. 1 shows a column-beam frame 3 in which columns 1 and beams 2 are assembled in a building. In consideration of bending deformation after construction, the beam 2 is bulged so that the central side in the longitudinal direction is positioned upward by the construction method of the present invention.

In this construction method, in the construction process of constructing the above-described column-beam frame 3, when forming the beam 2 by connecting a plurality of beam members 4 having the same beam thickness in the length direction, A plurality of beam members 4 are connected in a stepwise manner with a predetermined level difference D (see FIG. 2) so that the beam members 4 are positioned higher. In this embodiment, the beam members 4 are made of H-shaped steel having flanges 4b above and below a web 4a, as shown in FIG.

In the example shown in FIG. 1, a second beam member 4B having a higher installation level than the first beam member 4A having the lowest installation level at both ends in the longitudinal direction is connected with a predetermined level difference D. A third beam member 4C having a higher installation level than the second beam member 4B is connected to the second beam member 4B with a predetermined level difference D therebetween. Then, the third beam member 4C is connected to the fourth beam member 4D at the central part in the longitudinal direction, which is one step higher than the third beam member 4C, with a predetermined level difference D provided, and the beam 2 with the swelling is formed. forming In the illustrated example, among the first to fourth beam members 4A to 4D, the fourth beam member 4D at the center in the length direction is the longest, and the first beam member 4A at both ends in the length direction is the shortest. ing.

FIG. 2 shows a joint between a first beam member 4A and a second beam member 4B as an example of connection points (joint points) between the beam member 4 on the lower installation level side and the beam member 4 on the higher installation level side. shows the location. In this construction method, the first beam member 4A and the second beam member 4B are connected with a predetermined level difference D by adopting the following connection method at joint locations. Since the connection between the second beam member 4B and the third beam member 4C and the connection between the third beam member 4C and the fourth beam member 4D are also performed in the same manner, the description thereof is omitted.

As shown in FIG. 2, at the joint between the first beam member 4A and the second beam member 4B, a first filler plate 5A made of steel is attached to the upper surface of each flange 4b of the first beam member 4A on the lower installation level side. and a second filler plate 5B made of a steel plate having the same thickness as the first filler plate 5A is superimposed on the lower surface of each flange 4b of the second beam member 4B on the higher installation level side.

Then, in that arrangement state, the flange 4b of the first beam member 4A on the side with the lower installation level and the flange 4b of the second beam member 4B on the side with the higher installation level are connected to the upper and lower splice plates that straddle the flanges 4b. 6, and the upper and lower splice plates 6 are tightened by tightening means 7 such as bolts and nuts to fix both flanges 4b.
Then, in a state where the second beam member 4B is located at a higher level than the first beam member 4A by the thickness of the first filler plate 5A or the second filler plate 5B corresponding to the predetermined level difference D, the first Each flange 4b of the beam member 4A and each flange 4b of the second beam member 4B are connected.

Furthermore, the web 4a of the first beam member 4A on the side with the lower installation level and the web 4a of the second beam member 4B on the side with the higher installation level are sandwiched between the front and back splice plates 8 that straddle both webs 4a, The front and back splice plates 8 are tightened and fixed by tightening means 7 such as bolts and nuts.
In this manner, the first beam member 4A and the second beam member 4B are connected with a predetermined level difference D at their joints.

FIG. 3 is a beam plan showing the overall procedure of the erection process. In this erection process, as shown in FIGS. 3(a) to 3(d), a plurality of beam members 4 for forming a plurality of curved beams 2 are installed from the lower installation level side. Attach in order for each same installation level toward the higher level side. In this embodiment, the outer peripheral side of the building is the low installation level side, and the central side of the building is the high installation level side.

Specifically, as shown in FIG. 3( a ), among the plurality of beam members 4 for forming the plurality of beams 2 with bulges, the plurality of beam members 4 at the first installation level, which is the lowest installation level, are installed. 1 Beam member 4A is attached by joint connection to the outer periphery of the building or the like. Incidentally, the plurality of first beam members 4A at the first installation level may be integrated in advance with the outer periphery of the building or the like by welding or the like.

When the installation of the plurality of first beam members 4A on the first installation level is completed, as shown in FIG. It is attached to the end of the first beam member 4A by jointing.
When the installation of the plurality of second beam members 4B on the second installation level is completed, as shown in FIG. 2 It is attached to the end of the beam member 4B by joint connection.
Then, when the attachment of the plurality of third beam members 4C at the third installation level is completed, as shown in FIG. is attached to the end of the third beam member 4C by joint connection.

In this way, in this construction method, a plurality of beam members 4 for forming a plurality of beams 2 with bulges are arranged for each beam member 4 of the same installation level from the side with the lowest installation level with good workability. By mounting, it is possible to efficiently perform erection work for assembling a plurality of beam members 4 with different installation levels.

[Another embodiment]
Another embodiment of the present invention will be described. It should be noted that the configuration of each embodiment described below is not limited to being applied alone, and can be applied in combination with the configurations of other embodiments.

(1) In the above-described embodiment, the filler plates 5A and 5B, the splice plates 6 and 8, and the tightening means 7 are used to provide a predetermined level difference D between the beam members 4 to jointly connect them. Alternatively, the beam members 4 may be connected to each other with a predetermined level difference D by using welding or the like.

(2) In the above-described embodiment, when connecting a plurality of beam members 4 in a stepped manner, the case where the level difference between the plurality of beam members 4 is set to a constant level difference D was shown as an example. The level difference between the members 4 may be made different. In that case, for example, the level difference between the plurality of beam members 4 can be set to increase toward the center in the length direction, or to decrease toward the center in the length direction.
Incidentally, when changing the level difference between the plurality of beam members 4 at the joint location from the level difference D, for example, the thickness of the filler plates 5A and 5B is changed, or the thickness of the first filler plate 5A or the second filler plate is changed. A plurality of sheets of 5B can be stacked and used.

(3) The beam formation method of the present invention is not limited to the erection process shown in the above embodiment, and can be performed in a manufacturing process or the like in a factory or the like. Moreover, the present invention is applicable not only to the case of forming the beam 2 made of steel, but also to the case of forming the beam of other materials such as wood.

2 Beam 3 Column beam frame 4 Beam member 4a Web 4b Flange 5A First filler plate 5B Second filler plate 6 Splice plate 8 Splice plate D Level difference

Claims (4)

A beam forming method for forming a barbed beam, comprising:
When forming the beam by connecting a plurality of beam members having the same beam height in the length direction, a plurality of substantially horizontal beam members are arranged such that the beam member arranged closer to the center in the length direction is positioned higher. A beam forming method for connecting a plurality of substantially horizontal beam members in a stepped manner by providing a level difference at the connection points . A construction method in which the beam formation method according to claim 1 is performed in a construction process of constructing a column-beam frame by assembling columns and said beams. 3. The construction according to claim 2, wherein in the erection step, the plurality of beam members for forming the plurality of beams are sequentially installed for each same installation level from the lower installation level side toward the higher installation level side. Method construction method. When connecting a plurality of beam members of the same beam height in the length direction to form a beam with a bulge, a level difference is given so that the beam members arranged closer to the center in the length direction are positioned higher. A construction method in which a beam formation method for connecting a plurality of beam members by means of a beam is performed in a construction process for constructing a column-beam frame by assembling columns and beams,
The plurality of beam members are made of H-shaped steel having flanges on the top and bottom of the web,
In the erection step, connecting the plurality of beam members by giving the level difference,
A first filler plate is superimposed on the upper surface of the flange of the beam member on the lower installation level side at the joint locations of the plurality of beam members, and the lower surface of the flange of the beam member on the higher installation level side is arranged. A second filler plate having the same thickness as the first filler plate is placed on top of the first filler plate, and in the arrangement state, the flange of the beam member on the side with the lower installation level and the flange of the beam member on the side with the higher installation level are fixed by sandwiching them with upper and lower splice plates that straddle the flanges.

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