JP2713779B2 - Temporary rib reinforcement method for structural members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a temporary installation for bridge erection or construction, in which a temporary reinforcing rib is attached to a structural member.
The present invention relates to an economical method for reinforcing a temporary rib for a structural member, which can be easily removed at the time of disassembly and can be removed without damaging a base material of the structural member.

(Conventional technology) When reinforcing ribs are installed at arbitrary positions in the grooves of structural members such as H type, I type and groove type, conventionally, rib plates are attached by welding and used as structural materials for erection work. Yes,
After the installation is completed, the reinforcing ribs are cut and removed near the surface of the base material by air gouging or the like. The rest of the cut was scraped off with a grinder or the like to finish the surface of the base material flush.

(Problems to be Solved by the Invention) As described above, when a reinforcing rib used for erection is attached to a structural member, according to a conventional welding operation,
It requires a great deal of labor and time for removing and restoring the ribs after the completion of the erection work, and by applying welding heat to the base material, the material has a bad influence on the material and causes a deterioration. Furthermore, when removing the reinforcing ribs by air gouging, the base material may be cut off,
In this case, since the defective portion of the base material must be filled with the overlay by welding, the reheating at the time of the overlay increases the thermal effect. Further, when the structural member to be welded is a product to be delivered, there is a problem that the work of finishing the surface of the base material to the same level by grinding or the like is required, which is extremely troublesome.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, H
In a temporary rib that is inserted and fixed in a groove of a structural member such as a mold, an I-shaped groove, a groove, and the like as a reinforcing material, a plate-shaped member having a required area is provided on an edge of the rib facing the structural member. And the ribs are bonded to the structural member with a structural adhesive.

In the above method, the temporary rib may be removed by heating to a predetermined temperature.

Further, in the above-mentioned method, a concave notch for wedge driving may be provided on a joint surface of the plate-like member to be joined to the temporary rib and the structural member.

(Operation) As described above, in the present invention, in the case of a temporary rib that is inserted and fixed in a groove of a structural member such as an H-type, an I-type, or a groove type to serve as a reinforcing material, the rib faces the structural member. At the edge, a plate-like member having a required area is provided integrally with the rib, and the rib is bonded to the structural member with a structural adhesive, so that compared to the conventional method of welding the rib, The installation of the rib is extremely easy and can be performed safely.

Also, the removal of the ribs after the completion of the erection work is facilitated, so the work efficiency can be improved, and when the ribs are welded or removed, there is no need to heat the structural members by welding or air gouging. And there is no danger of causing deformation or distortion.

Further, if the temporary rib is heated to a temperature at which the adhesive strength of the used adhesive is reduced, it becomes easier to remove the rib from the structural member.

Furthermore, if a concave notch for wedge driving is provided on the joint surface of the plate-shaped member and the structural member to be bonded to the temporary rib, when removing the rib from the structural member, the wedge is driven into the concave notch. The ribs can be more easily peeled off.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a structural member such as an H type, an I type, a groove type, etc., 1a denotes its flange, and 1b denotes a web.

That is, FIG. 1 shows a structural member 1 formed into an H shape, and FIG. 2 shows a structural member formed into an I shape, and FIG.
The figure shows an H-section steel as a structural member.

Reference numeral 2 denotes a temporary rib which is inserted and fixed in the groove of the structural member 1 to be used as a reinforcing material. The rib 2 has a required area at an edge of the rib 2 facing the web 1b of the structural member 1. The plate member 2a is provided integrally with the rib 2. That is, the rib 2 is formed by abutting the plate-shaped rib main body 2b and the plate-shaped member 2a so that the cross-sectional shape becomes T-shaped, and integrally connecting them by welding or the like. Note that the plate-like member 2a may be provided at an edge facing the flange 1a.

Then, the rib 2 formed as described above is replaced with the structural adhesive 3.
Is bonded to the structural member 1.

FIG. 4 and FIG. 5 show another embodiment of the temporary rib according to the present invention.
Two wedge driving notches 2c are provided on the left and right sides of the joining surface of the plate-like member 2a with the web 1b. Reference numeral 5 shown in FIG. 4 denotes a wedge that is driven into the recess 2c when the rib 2 is peeled off.

As the structural adhesive 3 to be used in the present invention, any type may be used, and as an example, the types and properties of the adhesives of Sumitomo 3M Limited are shown in Table 1 below.

Table 2 shows the shear strength of each adhesive to various adherends.

FIG. 6 shows the relationship between the temperature and the strength of each adhesive.

That is, high performance adhesives have recently emerged as structural adhesives, and as a result, they are currently being put to practical use for joining structural members.

The present invention has been made from such a viewpoint, and uses a structural adhesive instead of conventional welding for joining a temporary rib to a structural member.

As described above, the bonding strength of the structural adhesive has recently increased dramatically. However, since the bonding strength is still considerably smaller than the welding strength, in the present invention, the plate-shaped member 2a is provided on the rib 2 and the bonding strength is increased. Is compensated by increasing the bonding area.

As described above, in the present invention, the rib 2 is joined to the structural member 1 by the structural adhesive 3, so that the attachment of the rib 2 becomes extremely easy.

Also, when the rib 2 is removed, it can be peeled off much more easily than the conventional welded one.

In this case, as shown in FIG. 6, this kind of structural adhesive has a remarkable strength when heated to a predetermined temperature (for example, about 100 ° C.) with respect to the strength at room temperature (about 25 ° C.). When the temporary rib is peeled off, the work for removing the rib is greatly facilitated by heating to a predetermined temperature if necessary.

As shown in FIGS. 4 and 5, if the rib 2 is provided with a concave notch 2c in the plate-like member 2a, the wedge 5 is inserted into the concave notch 2c when the rib 2 is removed. By driving in, the removal of the rib 2 can be made easier and more reliable.

(Effects of the Invention) As described above, in the present invention, the structure of the temporary rib 2 which is inserted and fixed in the groove of the structural member 1 such as the H type, the I type, the groove type and the like to form a reinforcing material is used. At the edge of the member 1 facing the web 1b, a plate-like member 2a having a required area is
And the ribs 2 are bonded to the structural member 1 with the structural adhesive 3, so that the mounting of the ribs 2 is extremely easy and safe compared to the conventional method of welding the ribs. Be able to construct.

In addition, since the work of removing the rib 2 after the completion of the erection work is also facilitated, the work efficiency can be improved, and when the rib 2 is welded or removed, there is no need to heat the structural member 1 by welding or air gouging. Member 1
There is no danger of adversely affecting the material or causing deformation or distortion.

Further, if the temporary rib 2 is heated to a temperature at which the adhesive strength of the used adhesive 3 is reduced, it becomes easier to remove the rib 2 from the structural member 1.

Further, a plate-like member 2a to be joined to the web 1b of the temporary rib 2
When the rib 2 is removed from the structural member 1, the wedge 5 can be driven into the concave notch 2c so that the rib 2 can be more easily removed. 2 can be peeled off.

As described above, according to the present invention, it is possible to remarkably improve the reinforcing method using such a temporary rib.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method for reinforcing a temporary rib for an H-shaped structural member of the present invention, FIG. 2 is a perspective view showing a method for reinforcing a temporary rib for an I-shaped structural member according to the present invention, and FIG. 5 is a front view showing a method of reinforcing a temporary rib of the present invention for a structural member of H-section steel, FIG. 5B is a side view thereof, FIG. 4 is a perspective view showing ribs and wedges of another embodiment, FIG. (A) is a front view of the rib, (b) is a bottom view thereof, (c) is a side view thereof, and FIG. 6 is a diagram showing a relationship between the temperature of the structural adhesive and the adhesive strength. It is. DESCRIPTION OF SYMBOLS 1 ... Structural member, 1a ... Flange 1b ... Web, 2 ... Rib 2a ... Plate member, 2b ... Rib body 2c ... Depressed notch, 3 ... Structural adhesive 5 ... Wedge

Claims (3)

(57) [Claims] 1. A temporary rib, which is inserted and fixed in a groove of a structural member such as an H-type, an I-type or a groove-type, as a reinforcing material, has a required area at an edge portion of the rib facing the structural member. A method of reinforcing a temporary rib for a structural member, comprising: providing a plate-shaped member integrally with the rib; and bonding the rib to the structural member with a structural adhesive. 2. The method according to claim 1, wherein the temporary rib is removed by heating to a predetermined temperature. 3. The method according to claim 1, wherein a concave notch for wedge driving is provided on a joint surface of the plate-like member to be joined to the temporary rib and the structural member. Temporary rib reinforcement method.