JP2003239058A - Hot-dip galvanizing method for i-shaped structural member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deformation, such as swelling, twisting and bending, in a hot-dip galvanizing step process for an I-shaped structural member. <P>SOLUTION: When applying hot-dip galvanizing to the I-shaped structural member having flanges 2 above and below a web 1 respectively, two I-shaped structural members are arranged in parallel with each other with the web 1 vertical, and a plurality of points including transverse endpoints of the I-shaped structural members are connected using constraint members 3 at the web 1 and the flanges 2 to form a pseudo-single structure. Hot-dip galvanizing is applied in the state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot dip galvanizing method for large I-shaped structural members, especially I-shaped structural members for bridges.

[0002]

2. Description of the Related Art Various steel structural members are widely used for construction and bridges. Structural members for bridges differ depending on the type of plate girder type, box type, truss type, etc. Among them, the plate girder type has upper and lower parts of the web (also referred to as abdominal plate) 1 as shown in FIG. An I-shaped structural member having the flange 2 attached thereto by welding or the like is used. These I-shaped structural members are I-shaped by welding a vertical stiffener (which will be referred to as a vertical stiffener) 3 or a horizontal stiffener (not shown) as illustrated in general to both sides or one side of the web 1. The structural members are reinforced and their deformation is prevented. Further, since such an I-shaped structural member is used by connecting in the lateral direction, a large number of joint bolt holes, that is, joint holes 9 are generally provided in the web 1 and the flange 2 at both ends as shown in FIG. There is.

On the other hand, when the I-shaped structural member is used for a bridge or the like, it is painted or hot dip galvanized (hereinafter also simply referred to as galvanized) for rust prevention. The latter galvanization is performed by immersing the long I-shaped structural member in a large hot dip galvanizing bath (about 440 ° C.) for usually 4 to 10 minutes, and then pulling it out of the bath and cooling it with warm water. Such rust prevention by hot dip galvanizing has excellent corrosion resistance and economical efficiency as compared with coating, but has a major problem of thermal deformation as described below.

That is, when a thin plate I-shaped structural member having a long and complicated cross section, such as an I-shaped structural member for a plate girder, is hot dip galvanized, residual deformation such as flapping of the web, twisting deformation and bending deformation of the girder is caused. Even if there is a difference in Such deformation occurs in the plating process of the I-shaped structural member due to thermal stress during immersion in the plating bath and immersion in cooling water. Generally, in the plating process, the web of the I-shaped structural member undergoes eccentric deformation, and the compressive thermal stress generated in the upper and lower flanges in the subsequent cooling process acts eccentrically due to the effect of the eccentric deformation, causing torsional buckling. Is believed to be.

Such entrainment and twist in the I-shaped structural member are affected by the thickness and height of the web, the yield strength of the steel material, and the like. The smaller the thickness and the larger the height, It also increases as the yield strength decreases. In addition, the deformation varies depending on the plate thickness ratio between the flange and the web, the plating dipping conditions, and the like, and the larger the plate thickness ratio and the slower the plating dipping speed, the more these deformations tend to increase. In particular, the twist increases in addition to these factors, as the member becomes longer.

[0006] Conventionally, as a measure for preventing the deformation of such an I-shaped structural member during galvanizing, there has been proposed a method of attaching a member for preventing deformation (hereinafter referred to as anti-separation member) to both lateral ends of the web. There is. FIG. 14 exemplifies this method, and is a side view when the anti-separation member 4 is attached to the web 1 at both ends of the I-shaped structural member used for the plate girder by the bolt 6 using the joint hole 9. .

As shown in the figure, according to the conventional method, anti-separation members 4 made of rigid angle steel are attached to both sides of the joint portion of the web 1 by tightly tightening them with bolts 6 and melted by the anti-separation members 4. The present invention aims to prevent or reduce thermal deformation that occurs in an I-shaped bridge member in the galvanizing process.

[0008]

In the conventional method using the anti-seizing material, the amount of deformation of the entrainment occurring at the end of the web in the hot dip galvanizing process is considerably reduced as compared with the case where it is not carried out. . Therefore, it can be said that this anti-separation material is one of the effective measures for preventing the entrainment deformation at the end portion of the web. However, this method only prevents the end portion of the I-shaped structural member from being entangled, and has almost no effect on the prevention of entanglement and twisting of the portion other than the end portion. Even if a stopper material is provided at the end of the I-shaped structural member, it is still an open end and has a degree of freedom of deformation. It has almost no effect on deformation such as bending and bending, and these deformations occur substantially in the same manner as when the anti-separation member is not provided.

Even if the deformation of the web at the end of the I-shaped structural member can be prevented, if the twisting or the bending occurs, the I-shaped structural member will be connected at the site with a joint and the bridge will be assembled. It is difficult to align the joint portion of the I-shaped structural member. Not only that, but if the amount of deformation exceeds the allowable amount, the attachment of the joint becomes extremely difficult. In this case, therefore, a large-scale work for mechanically correcting the deformation is inevitable in the field.

Therefore, such twisting or bending poses a serious problem when the I-shaped structural member is used as a bridge member. As a solution to this, it is conceivable to devise the structure of the I-shaped structural member itself and the thickness and shape of its constituent members, but at present, these deformations have not been prevented. For example, increasing the web thickness is a major problem in terms of mass increase, but the web thickness is 1 mm.
Even if it is thickened, the I-shaped structural member has an open end and has a degree of freedom of deformation, so that twisting and bending cannot be avoided as long as it is galvanized. Especially for web thickness,
When the plate thickness of the flange becomes considerably thick (for example, 1: 3 or more) or when the member length is long (for example, 12 m or more), twisting or bending of the I-shaped structural member due to galvanization and web entrapment other than at the ends are observed. It gets even bigger.

So far, no practical and effective deformation preventing method other than the anti-separation material has been known in galvanizing I-shaped structural members. For this reason, although it is recognized that the galvanized girder is superior to the painted girder in terms of life including the life of the girder for bridges, the thermal deformation is a major obstacle and its spread is delayed. is the current situation.

Therefore, according to the present invention, I
We provide a simple and practical galvanizing method that can prevent deformation such as entrapment, twisting, and bending in galvanizing structural members, and also for the transportation, storage, or installation of I-shaped structural members after galvanizing. However, it has an excellent effect.

[0013]

The present invention has been achieved as a result of various studies for achieving the above object.
It has the following configuration requirements. 1) In a method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of a web, a plurality of the I-shaped structural members are arranged in parallel with the web in a vertical direction, and adjacent I-shaped structural members are formed by the I-shaped structure. A hot-dip galvanizing method for an I-shaped structural member, which comprises immersing in a hot-dip galvanizing bath and performing galvanizing in a state in which a plurality of parts including both lateral ends of the member are connected by restraining members. 2) In a method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of a web, a plurality of the I-shaped structural members are arranged side by side in the longitudinal direction of the web, and the lateral ends of adjacent I-shaped structural members are arranged. I-shaped structural member characterized by dipping in a hot dip galvanizing bath and galvanizing it at a plurality of locations including parts, with the outer side and / or the web side of the flange of the I-shaped structural member being connected by a restraining member. Hot dip galvanizing method. 3) In the method of galvanizing an I-shaped structural member having flanges on the upper and lower parts of the web, a plurality of the I-shaped structural members are arranged in parallel in the vertical direction, and the webs and flanges of adjacent I-shaped structural members are formed. A method for hot dip galvanizing an I-shaped structural member, characterized in that the I-shaped structural member is dipped in a hot dip galvanizing bath and galvanized in a state in which the I-shaped structural member is connected with a restraining member at a plurality of locations including both ends in the lateral direction. . 4) In a method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of the web, a plurality of the I-shaped structural members are arranged in parallel with the web in the longitudinal direction, and the webs of the adjacent I-shaped structural members are formed by the I-shaped structural member. Characterized in that the structural members are connected by restraining members at a plurality of locations including both ends in the lateral direction, and the anti-seizure material is vertically attached to the web, and is immersed in a hot dip galvanizing bath for galvanizing. A method for hot dip galvanizing an I-shaped structural member. 5) In a method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of a web, a plurality of the I-shaped structural members are arranged in parallel with the web in a vertical direction, and both lateral ends of adjacent I-shaped structural members are arranged. At a plurality of locations including a portion, a pair of restraining members disposed outside the upper and lower flanges are connected by a connecting member between the end portion and the I-shaped structural member, and the flange of each I-shaped structural member is With it sandwiched by reinforcements,
A method of hot dip galvanizing an I-shaped structural member, which comprises dipping in a hot dip galvanizing bath for galvanizing. 6) I according to any one of 1 to 5 above, wherein an anti-seizure material is vertically attached to one or both sides of the web.
For hot dip galvanizing structural members. 7) The hot-dip galvanizing method for an I-shaped structural member according to any one of 1 to 6 above, wherein the restraint member is a plate, a frame, a connecting bar, an angle member, or an angle steel. 8) The hot dip galvanizing method for an I-shaped structural member according to any one of 4 to 7 above, wherein the anti-seizure material is an angle material or an angle steel. 9) The restraint member and / or the anti-seize member are attached using a joint hole, a bracket previously attached to an I-shaped structural member, or a vertical stiffener of the I-shaped structural member, or a bolt hole opened in a web or a flange. 9. A method of hot dip galvanizing an I-shaped structural member according to any one of 8 above. 10) The above 2, 6 in which the upper and lower restraint members that connect the flanges of the adjacent I-shaped structural members are connected by a reinforcing material.
10. The hot dip galvanizing method for an I-shaped structural member according to 7, 8 or 9. 11) A method of hot dip galvanizing an I-shaped structural member, characterized by combining two or more methods selected from the above 1-5. 12) The hot dip galvanizing method for an I-shaped structural member according to any one of 1 to 11 above, in which a spacer is interposed between the I-shaped structural member and the restraining member and / or the anti-seize member. 13) The above-mentioned 1-1 in which the I-shaped structural member is a bridge girder.
3. The method of hot dip galvanizing an I-shaped structural member according to any one of 2 above.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The hot dip galvanizing method for an I-shaped structural member according to the present invention does not involve immersing the I-shaped structural member in a single state in a hot dip galvanizing bath to galvanize it, but at least 2 The individual I-shaped structural members are connected by a restraining member at a plurality of positions including both ends in the lateral direction (longitudinal method) of the I-shaped structural member (both ends are lateral ends unless otherwise specified). It is characterized in that hot-dip galvanizing is performed in this state.

According to the present invention, a plurality of I-shaped structural members are hot-dip galvanized in a state where they are connected by restraining members at a plurality of locations including both ends. Even if the I-shaped structural members are temporarily made into a pseudo single structure and each I-shaped structural member is subjected to thermal stress in the hot dip galvanizing process, the I-shaped structural members cannot freely deform as before. This is because That is, by firmly connecting the I-shaped structural members with the restraining members in this way, even if the I-shaped structural members try to deform due to thermal stress during the plating process, the I-shaped structural members are constrained to each other by the restraining members and the deformation is remarkable. It is based on being suppressed.

In the present invention, the I-shaped structural member is a metal member which requires hot dip galvanizing for rust prevention and can obtain required strength as various structural materials, and is usually made of steel. A long thin plate structural member having a substantially I-shaped cross section having flanges attached to the upper and lower portions of the web by welding or the like, and a typical example thereof is a bridge girder for a bridge. Of course, it may be an I-shaped structural member for purposes other than the plate girder.

Further, the I-shaped structural member is a large I-shaped structural member which causes the above-mentioned entrainment deformation, twisting deformation, etc. in the process of hot dip galvanizing, and usually has a member length of 4 m.
The above is effective for the present invention. The thickness and dimensions of the web and the flange of the I-shaped structural member are appropriately determined mainly depending on the application, but as a practical range, the web thickness is 5 to 20 mm and the height is 1000 to 3000.
mm, flange thickness 10 to 50 mm, width 20
It is generally about 0 to 800 mm.

In the present invention, the number of I-shaped structural members connected to form a pseudo single structure is usually two, but is not limited to this. However, as the number of I-shaped structural members increases, the apparent volume after connection becomes more than twice as large as that of a single I-shaped structural member. Since the mass is remarkably increased, loading and unloading into and from the plating bath increases, and workability of hot dip galvanizing deteriorates.

Further, in a preferred embodiment, the number of I-shaped structural members to be connected is set in order to store and transport the I-shaped structural members in a connected state without removing the restraint member from the I-shaped structural member even after plating. When there are three or more, there are many obstacles in these aspects. Therefore, it is optimal to connect two I-shaped structural members. In the explanation below,
For convenience, the number of I-shaped structural members is all two.

The restraint member of the present invention must be capable of preventing or suppressing the aforementioned deformation of the I-shaped structural member against the thermal stress in the hot dip galvanizing process. Therefore, it is usually made of high strength steel. Further, as the form of the restraint member, various kinds such as a plate-like body, a truss, a frame body framed in the vertical and horizontal directions, an angle member, a chevron steel or a connecting bar can be cited. The type of restraint member to be used is appropriately determined mainly depending on the method of connecting the I-shaped structural members and the specifications of the I-shaped structural members to be connected, but usually a plate-shaped body or angle steel is a simple structure and attached. It is preferable in terms of workability.

In the present invention, the restraint member is provided at a plurality of locations including both ends of the I-shaped structural member. That is,
Both ends of the I-shaped structural member are necessarily connected by the restraining members, and the intermediate parts other than the both ends are connected as necessary. When the I-shaped structural member is not so long, it is sufficient to connect both ends, but when the long I-shaped structural member or the I-shaped structural member whose shape specification is easily deformed by thermal stress, further, for example, I The central portion of the shaped structural member is also connected by the restraining member. The number of connections in the middle of the I-shaped structural member can be increased to two or more if desired. In this case, the restraint members at both ends and the restraint member at the intermediate portion may have the same form or different forms.

Further, according to the present invention, for the purpose of suppressing the deformation of the web caused by flapping, a cleat preventing member can be appropriately attached to the web of the I-shaped structural members connected by the restraining member. The anti-separation material is particularly effective for an I-shaped structural member in which the height and length dimensions of the web are large and the seismic deformation is likely to occur. Further, although it can be provided at one or both of the both ends and the intermediate part of the web, suitable positions for providing the anti-separation material are the both ends of the web and the intermediate part of the web where the vertical stiffener is not provided.

As a material of the anti-seizure material, an angle material or angle steel made of steel having a large bending strength and rigidity is usually suitable. These materials are cut to size and processed into anti-seizure materials, and the joint holes in the web, brackets attached to the web, or bolt holes drilled in the web are used to make a vertical direction (vertical stiffener) on one or both sides of the web. (Same direction as).

When the I-shaped structural members are connected by the restraining member, the two I-shaped structural members adjacent to each other with the web in the longitudinal direction are preferably 0.5 to 1.5 m, and particularly 0.8 to
The webs are arranged side by side at intervals of 1.0 m, and in this state, both ends of the web are connected by a restraining member. Actually, the mounting method varies depending on the connecting position and the form of the restraint member, but most of them are joint holes, brackets attached to the I-shaped structural member in advance, or vertical stiffeners, webs or flanged bolts of the I-shaped structural member. Secure with bolts using the holes. When the I-shaped structural member is for a girder, since the joint holes at both ends are provided with the joint holes as described above, the both ends can be easily connected by the restraining member by utilizing the joint holes.

Further, when anti-seizure materials are attached to both ends of the web as an anti-eclipse deformation measure during hot dip galvanizing, it is preferable to connect them with restraining members through the anti-seizure materials as described later. preferable.

In the present invention, the hot dip galvanizing condition and the cooling condition of the I-shaped structural member may be substantially the same as those in the conventional method. Therefore, although these conditions are not described in detail, the plating conditions are as follows: bath temperature: 435-445
[Deg.] C., immersion speed in plating bath: 10 to 30 m / min, immersion angle: 15 to 25 degrees, pulling speed: 1 to 10 m / minute, and pulling angle is preferably gradually increased from an initial 5 degrees to a final 30 degrees. The cooling conditions are water temperature: 60 to 80 ° C., immersion speed:
It is preferably about 10 to 30 m / min and the immersion angle is about 20 to 30 degrees, and the pulling speed and the angle are arbitrarily selected. next,
Main embodiments of the present invention will be specifically described with reference to the drawings.

In FIG. 1, two I-shaped structural members are attached to a restraining member 3.
2 is a plan view when connected with, and FIG.
The notched cross-section of FIG. 1 is the AA section of FIG. This example is 2
In the case where the I-shaped structural members for the plate girders are connected by the restraint member 3 shown in FIG. 3, the two I-shaped structural members arranged in parallel are connected at both ends and the intermediate part to form a pseudo single structure. There is. Note that only one intermediate restraint member 3 is shown in FIG.

In this example, each I-shaped structural member before connection is
Similar to what is commonly used in the past, joint holes 9 (Fig.
3) are provided on the web 1 and the flange 2 at the joints at both ends of the I-shaped structural member. Vertical stiffeners 5 are provided at predetermined intervals on both sides of the web 1 as shown in FIG. Then, the anti-separation member 4 made of, for example, an angle member is firmly attached by bolts 6 to both sides of the web 1 at both ends of the I-shaped structural member by utilizing the joint holes 9. It should be noted that bolt holes are provided in advance in the anti-seizure member 4 located inside the two parallel I-shaped structural members.

FIG. 3 shows the restraint member 3 of this example. The restraint member 3 is formed of a quadrangular thick plate made of steel, and bolt holes 8 for attachment are provided at both left and right ends of the restraint member 3. Here, the restraint member 3
Has a height substantially equal to or less than the height of the web 1 of the connecting I-shaped structural members. Further, the lateral width can be appropriately determined, but the lateral width defines the interval between the two I-shaped structural members connected to each other. If the lateral width of the restraint member 3 is too large, the width of the I-shaped structural member after connection becomes unnecessarily large, which affects the size of the hot-dip galvanizing bath, the storage space after plating, and transportation in the field. On the other hand, if the width is too small, the workability when attaching the restraint member 3 to the I-shaped structural member is deteriorated, and the resistance when immersed in the plating bath increases, and the immersion speed may have to be reduced. is there. Generally, when the immersion speed in the plating bath is low, the amount of twist generated in the I-shaped structural member increases. Taking these factors into consideration, the width of the restraint member 3 is usually appropriate to be about 50 to 150 cm.

The thickness of the restraint member 3 is determined so as to obtain a strength that can withstand the stress generated in the hot dip galvanizing process. If this thickness is small, the required strength cannot be obtained, so that the restraint member 3 is deformed by the thermal stress of the hot dip galvanizing process, and the I-shaped structural member is sufficiently deformed such as entrainment, twisting, and bending. I can't control it. However, since the deformation of the I-shaped structural member mainly depends on the member length, the web thickness, the flange thickness, etc., it is practical to determine the thickness of the restraint member 3 based on the design specifications of the I-shaped structural member. Is. In the case of a restraint member connecting I-shaped structural members for bridges, its thickness is preferably 10 to 50 mm.

Next, a method of actually connecting the two I-shaped structural members with the restraint member 3 will be described. First, the connection at both ends of the I-shaped structural member will be described. Two I with pre-attached anti-sticking material 4 on the web 1 of the joint part
The shaped structural members are arranged side by side with the web 1 in the longitudinal direction at an interval corresponding to the lateral width of the restraining member 3. Next, the restraint member 3 is brought into contact with the inner anti-seize member 4 (see FIG. 1), and the anti-seize member 4 and the restraint member 3 of each I-shaped structural member are tightened with bolts 10. In this case, the number of the bolts 10 may be appropriately selected depending on the size of the structural member, the mounting strength of the restraint member 3, and the like, but it is desirable to fix the upper and lower portions of the restraint member 3 and the central portion in a focused manner.

On the other hand, the restraint member 3 at the intermediate portion is provided with a bolt hole in the vertical stiffener 5 of the I-shaped structural member, and is fixed to the vertical stiffener 5 by the bolt 10 using the bolt hole. When the web 1 does not have the vertical stiffener 5, for example, a bracket is attached to the web 1 at a position where the web 1 is to be connected, and the restraint member 3 is attached via the bracket to connect the web 1. Thus, the two I-shaped structural members are connected by the restraining member 3 at both ends and the intermediate part. Since the I-shaped structural member of this example is provided with the vertical stiffener 5, the anti-sticking member 4 is not provided in the intermediate portion of the I-shaped structural member. For example, a bracket is provided on the web 1 and the anti-seizure member 4 is mounted in the vertical direction. Since the anti-seizure member 4 is substantially the same as that of this example in all the examples, the description thereof will be omitted in the examples described later.

When the restraint member 3 and the anti-seize material 4 are attached, the anti-seize material 4 is in close contact with the web 1,
Further, when the restraint member 3 comes into close contact with the vertical stiffener 5, the web 1 and the vertical stiffener 5 in this portion are restrained by the restraint member 3 respectively.
Since it is covered with the anti-seizure material 4, plating is not performed. In order to prevent this, between the web 1 and the anti-separation member 4, and between the vertical stiffener 5 and the anti-separation member 4,
Pipe washers 7 are inserted as spacers, respectively. FIG. 11 shows an example of this pipe washer 7, which has a diameter of preferably 5 to 15 m on the four end portions of the pipe body.
A semicircular hole 12 for the zinc outflow of m is conveniently provided. The pipe washer 7 may be tack-welded to the anti-sticking member 4 and the restraining member 3 in order to improve workability. The wearing of the spacer is the same in all the examples described later.

When connecting I-shaped structural members having vertical stiffeners or horizontal stiffeners attached to only one side of the web, when the I-shaped structural members are juxtaposed, the stiffeners are symmetrical. It is preferable to arrange in. Further, as the form of the restraint member 3, the exemplified plate-like body is preferable, but a truss, a frame body framed vertically and horizontally, a composite panel, or the like can also be used.

FIG. 4 is a side view similar to FIG. 2 showing another embodiment of the present invention. In this example, as shown in the drawing, the flanges 2 of the two I-shaped structural members are fixed by a restraining member 3 to be connected to each other to form a pseudo single structure. The places where the restraint members 3 are connected may be considered to be the same as in FIG. To connect the both ends, the restraint members 3 are brought into contact with the outside and the inside (the side of the web 1) of the joint portion of the flange 2, and these restraint members 3 are fixed to the flange 2 with the bolts 10 using the joint holes. It is obtained by doing. Angle-shaped steel having a U-shaped cross section is used as the restraining member 3 fixed to the outside of the flange 2, but a plate-shaped body, an angle member, or the like can also be appropriately used. Further, as shown in the figure, if the outer side and the inner side of the flange 2 are tightened with the two restraint members 3, a strong connecting structure is obtained, but the outer side or the inner side of the flange 2 may be connected.

The restraint member provided at the intermediate portion of the I-shaped structural member has substantially the same manner of connection with the restraint member at the above-mentioned end portion. However, since a bolt hole for fixing the restraint member to the flange 2 is not provided in the intermediate portion, the bolt hole is provided in the flange 2 and then the restraint member 3 fixes.
Further, the restraint members at both end portions and the intermediate portion are usually of the same form, but a restraint member having a different form from the end portions may be adopted at the intermediate portion.

FIGS. 5 and 6 show another embodiment in which the two I-shaped structural members of FIG. 4 are connected at the flange 2. That is, FIG. 5 shows a structure in which both ends of the upper and lower restraining members 3 connecting the two I-shaped structural members on the outer side of the flange 2 and the intermediate portion of the two I-shaped structural members are reinforced by the connecting member 11. Is. Thereby, the connection structure by the restraint member 3 can be made more solid. In this case, the connecting member is preliminarily welded to the restraining member 3 from the viewpoint of workability to form a frame structure capable of surrounding the outside of the I-shaped structural member, and then inserted into the end portion of the I-shaped structural member. 3 is preferably fixed to the flange 2 with bolts 10.

Further, in FIG. 5, the interval between the connecting member 11 provided outside the I-shaped structural member and the connecting member 11 provided between the two I-shaped structural members is made to match the width of the flange 2 to form the frame body. However, if both sides of the flange 2 can be sandwiched by the connecting members 11, two I-shaped structural members can be simply inserted into the frame body without fixing the restraining member 3 to the flange 2. The I-shaped structural member can be a connecting structure. In this case, when the width of the upper flange 2 is smaller than that of the lower flange 2 as shown in FIG. 5, the connecting member 11 is provided with, for example, a convex portion, or a spacer having rigidity between the flange 2 and the connecting member 11. 1
7 is provided and the dimensions are adjusted.

FIG. 6 shows an application example in which two I-shaped structural members are connected by fixing the restraining member 3 to the I-shaped structural member with bolts 10 inside the flange 2. Two
By connecting the upper and lower restraining members 3 made of, for example, an angle member that connect the individual I-shaped structural members with the reinforcing bar 14 to block both restraining members 3, a strong connecting structure is obtained. .

Further, FIGS. 7 to 9 are schematic views showing another embodiment of the present invention. In each figure, 10 is a restraint member 3.
Shows a bolt for fixing the to the I-shaped structural member. Each of these examples has a restraint member 3 formed in a rectangular frame body.
It is characterized by connecting I-shaped structural members with. Each frame body can be generally made by welding from a steel material such as an angle material or an angle steel, and the restraining member 3 in various forms can be obtained by combining the steel materials. That is, the restraint member 3 in FIG. 7 is a simplest rectangular frame body, FIG. 8 is a frame body in which vertical and horizontal steel materials are combined with the rectangular frame body, and FIG. 9 is a truss-shaped steel material. It is a frame body assembled into. Although not shown, providing a spacer between the restraining member 3 and the I-shaped structural member and providing the anti-separation member 4 as necessary is the same as in the above-described embodiment.

Two adjoining frame-like restraining members 3 are provided.
In order to connect the individual I-shaped structural members, the I-shaped structural members sandwich the frame from both sides, and in this state, each I-shaped structural member is tightened and fixed to the restraining member 3 by the bolt 10. in this case,
It is preferable to fix the web 1 and the flange 2 of the I-shaped structural member to the restraining member 3 as illustrated, because a solid connection structure is obtained. However, as described above, the web 1 or the flange 2
It is also possible to fix only this to the restraint member 3.

FIG. 10 shows still another embodiment of the present invention, which is a web 1 of two adjacent I-shaped structural members.
Are fixedly connected by a connecting bar 15, and are further opposed to each other by a reinforcing bar 16, one upper flange 2 of the I-shaped structural member.
And the other lower flange 2 are connected and reinforced. However, the connecting bar 15 alone has a considerable effect.

Further, in the present invention, when two I-shaped structural members are connected to each other to obtain a quasi-single structure, both ends of the I-shaped structural member, and further, an intermediate part thereof, usually have the same connection structure or connection. Method is used. However, the present invention can combine different connection structures or connection methods as described above. For example, both ends may have the connecting structure shown in FIG. 2 and the middle part may have the connecting structure shown in FIG. Further, the connection structure of the end portions may be combined with the connection structure of FIGS.

[0044]

Example: Flange thickness is 20 mm, web height is 24
00 mm, web thickness 12 mm, member length 10.4
An m-shaped I-shaped structural member for a bridge was manufactured from a steel material by providing eight vertical stiffeners at equal intervals in the middle part. Then, each two I-shaped structural members were connected by a restraining member, and the samples of Examples 1 to 6 in Table 1 were produced by the following method. Examples 1 and 2 are the methods of FIGS. 1 and 2 (only the webs are connected by the restraint plate),
In Example 3 and Example 4, the both ends are connected by the method of FIG. 4 (only the flanges are connected), and in Example 5 and Example 6 by the method of FIG. 9 (the flange and the web are connected by the frame). Regarding the method of connecting both ends, ones with and without connecting the intermediate portion were prepared. With respect to those connecting the intermediate portions, all of the central portions of the I-shaped structural member were made by the constraining plate. The anti-seizure material was attached only to the end of all the samples.

On the other hand, in order to compare the method of the present invention with the conventional method, only the anti-seizure material was attached to both sides of the web at both ends of the same I-shaped structural member as the above-mentioned I-shaped structural member as Example 7. A sample was prepared.

[0046]

[Table 1]

For each of these seven types of I-shaped structural members,
Plating conditions (bath temperature: 440 ° C, immersion speed: 20 m /
Min, immersion angle: 15 degrees, pulling speed: 1-10 m / min)
And cooling conditions (water temperature: 65 ° C., immersion speed: 30 m /
Min., Dipping angle: 20 degrees), and after the hot dip galvanizing, "twist" of each member and "deformation deformation (web flatness)" of each member were evaluated. For the measurement of twist, the amount of d shown in FIG. 12 was measured at both ends, and the larger twist was described. The flatness of the web was measured by measuring the amount of unevenness in each zone partitioned by a vertical stiffener, and the maximum value was described. Table 2 shows these measurement results.
Shown in.

[0048]

[Table 2]

As is clear from Table 2, the twist and the flatness of the web of the I-shaped structural members of Examples 1 to 6 in which at least both ends are connected are the same as in Example 7 in which only the clasps are attached to the conventional web end. Compared with,
It can be seen that the twist of the shaped structural member and the eccentric deformation of the web are suppressed.

Further, in Examples 1, 3, and 5 in which the central portions of the I-shaped structural members are connected, both the twist and the flatness of the web are improved as compared with Examples 2, 4, and 6 in which only both ends are connected. In particular, the twist prevention effect is improved.

[0051]

As described above, according to the present invention, a plurality of places including both ends of at least two I-shaped structural members to be hot dip galvanized are firmly connected by a restraining member to form a pseudo single structure. Since hot dip galvanizing is performed in this state, each I
Even if the shaped structural member tries to be deformed due to thermal stress in the hot dip galvanizing process, the deformation is suppressed due to the single structure, and the deformation such as entrapment, twisting, bending, etc. can be significantly prevented or reduced. . In particular, these deformations are most likely to occur, and these deformation prevention is required more strongly than the other parts as the joint portion. By intensively connecting the ends of the I-shaped structural member with the restraining member, it is possible to solve the problem by the conventional method. The deformation which was not present can be reduced to an acceptable range very effectively. Further, the deformation can be further suppressed by connecting the intermediate portion of the long I-shaped structural member.

Further, when the both ends of the I-shaped structural member are connected by the restraint member, the joint hole of the joint portion can be used to simply and firmly carry out the connection, and this joint portion is known as a conventional method. It is more preferable to attach the anti-separation member and to connect with the restraint member via the anti-separation member, since not only the connecting work is facilitated but also the deformation preventing effect of the restraint member is added.

Furthermore, according to the present invention, even after the hot dip galvanizing, the restraining member is not removed and is held as it is until it is installed, so that the conventional method of hot dip galvanizing the I-shaped structural member cannot be obtained at all. Many additional effects can be obtained.

That is, in the present invention, the twist of the I-shaped structural member is remarkably small, and at least two I-shaped structural members are unitized by connecting the ends with the restraining members at desired intervals. Compared with the conventional method, a great advantage beyond the conventional method can be obtained such that the shaped structural member can be stored and transported in an upright and stable state.

[Brief description of drawings]

FIG. 1 is a plan view showing, in a notched cross section, a part of an I-shaped structural member according to an embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a perspective view of an embodiment of a restraint member according to the present invention.

FIG. 4 is a side view corresponding to FIG. 2 in another embodiment of the present invention.

FIG. 5 is a side view corresponding to FIG. 2 in another embodiment of the present invention.

FIG. 6 is a side view corresponding to FIG. 2 in another embodiment of the present invention.

FIG. 7 is a schematic side view of another embodiment of the present invention.

FIG. 8 is a schematic side view of another embodiment of the present invention.

FIG. 9 is a schematic side view of another embodiment of the present invention.

FIG. 10 is a schematic side view of another embodiment of the present invention.

FIG. 11 is a perspective view of a spacer.

FIG. 12 is an explanatory diagram of measuring the twist amount of the I-shaped structural member.

FIG. 13 is a perspective view of an I-shaped structural member.

FIG. 14 is a side view of an I-shaped structural member equipped with a conventional anti-seizure member.

[Explanation of symbols]

1: Web 2: Flange 3: Restraint member 4: Anti-scatter material 5: Vertical stiffener 6: bolt 7: Pipe washer 8: Bolt hole 9: Joint hole 10: Bolt 11: connecting material 14: Reinforcing bar 15: Connection bar

Continued front page    (72) Inventor Yoshihiro Murakami             29-1 Kosakamachi, Mihara City, Hiroshima Prefecture (72) Inventor Kanji Fujimoto             187-22 Matsue, Numata Nishimachi, Mihara City, Hiroshima Prefecture (72) Inventor Masayuki Fujimoto             383 Jingukou, Imabari, Ehime Prefecture (72) Inventor Koji Yanagawa             4315 Hongo, Hongo-cho, Toyota-gun, Hiroshima Prefecture (72) Inventor Kohei Kikukawa             1043-30 Sosada, Numatanishimachi, Mihara City, Hiroshima Prefecture F-term (reference) 4K027 AA08 AA22 AB05 AB42 AC18                       AC47 AD13

Claims (13)

[Claims] 1. A method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of a web, wherein a plurality of said I-shaped members are formed.
Adjacent I-shaped structural members are arranged side by side with the web in the vertical direction.
Melting of an I-shaped structural member, characterized in that the I-shaped structural member is dipped in a hot dip galvanizing bath and galvanized in a state in which the I-shaped structural member is connected with restraining members at a plurality of locations including both ends in a lateral direction. Galvanizing method. 2. A method of galvanizing an I-shaped structural member having flanges on the upper and lower parts of a web, wherein a plurality of said I-shaped structural members are formed.
Adjacent I-shaped structural members are arranged side by side with the web in the vertical direction.
At a plurality of locations including both lateral ends of the shaped structural member,
A hot dip galvanizing method for an I-shaped structural member, which comprises immersing the flange of the I-shaped structural member on the outer side and / or the web side with a restraining member for galvanizing by immersing it in a hot dip galvanizing bath. 3. A method of galvanizing an I-shaped structural member having flanges on the top and bottom of a web, wherein a plurality of said I
Adjacent I-shaped structural members are arranged side by side with the web in the vertical direction.
I-shape characterized in that the web and the flange of the I-shaped structural member are dipped in a hot dip galvanizing bath and galvanized in a state where the web and the flange are connected by restraining members at a plurality of locations including both ends in the lateral direction of the I-shaped structural member. Hot dip galvanizing method for structural members. 4. A method of galvanizing an I-shaped structural member having flanges on the upper and lower parts of a web, wherein a plurality of said I
Adjacent I-shaped structural members are arranged side by side with the web in the vertical direction.
The web of the I-shaped structural member is connected to the I-shaped structural member at a plurality of locations including both ends in the lateral direction by restraint members, and the anti-seizing material is vertically attached to the web, and the web is immersed in the hot dip galvanizing bath. A hot dip galvanizing method for an I-shaped structural member, characterized in that the galvanizing is carried out. 5. A method of galvanizing an I-shaped structural member having flanges on the upper and lower portions of a web, wherein a plurality of said I-shaped structural members are formed.
Adjacent I-shaped structural members are arranged side by side with the web in the vertical direction.
At a plurality of locations including both lateral ends of the shaped structural member,
In a state where a pair of restraint members arranged outside the upper and lower flanges are connected by a connecting member between the end portion and the I-shaped structural member, and the flanges of the respective I-shaped structural members are sandwiched by the reinforcing members. A method of hot dip galvanizing an I-shaped structural member, which comprises immersing in a hot dip galvanizing bath for galvanizing. 6. The hot dip galvanizing method for an I-shaped structural member according to claim 1, wherein an anti-seizure material is vertically mounted on one side or both sides of the web. 7. The hot dip galvanizing method for an I-shaped structural member according to claim 1, wherein the restraint member is made of a plate, a frame, a connecting bar, an angle member, or angle steel. 8. The hot dip galvanizing method for an I-shaped structural member according to claim 4, wherein the anti-seizure material is an angle material or an angle steel. 9. The restraint member and / or the anti-seize member are attached using a joint hole, a bracket previously attached to an I-shaped structural member, or a bolt hole opened in a vertical stiffener, web or flange of the I-shaped structural member. A hot dip galvanizing method for an I-shaped structural member according to claim 1. 10. The I-shaped structural member according to claim 2, wherein the upper and lower restraining members connecting the flanges of the adjacent I-shaped structural members are connected by a reinforcing material. Hot dip galvanizing method. 11. A method of hot dip galvanizing an I-shaped structural member, characterized by combining two or more methods selected from claims 1-5. 12. The I according to any one of claims 1 to 11, wherein a spacer is interposed between the constraining member and / or the anti-seizure member and the I-shaped structural member.
For hot dip galvanizing structural members. 13. The hot dip galvanizing method for an I-shaped structural member according to claim 1, wherein the I-shaped structural member is a bridge girder.