JP3065186B2 - Steel frame with inner diaphragm plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an inner diaphragm plate integrally connected by electroslag welding to a steel frame having a closed cross section, such as a box column, a box beam, a box truss material, a box brace, and the like. The present invention relates to a steel frame with a diaphragm plate.

[0002]

2. Description of the Related Art When a beam is integrally connected to a box column having a closed cross section, for example, the longitudinal end face of the beam is abutted against a vertical plate surface of a base material of the box column. Although the abutting portion is welded, if it is simply configured, the beams are separated from each other by the box column, and the strength for transmitting the stress generated in the beam to the box column is reduced. Conventionally, in order to avoid this reduction in strength, an inner diaphragm plate is welded to the inside of a box column having a closed cross section so that the beams on both sides of the column are substantially continuous.

[0003] Such welding of the inner diaphragm plate to the base material of the box column has been performed, for example, as follows. That is, as shown in the exploded perspective view of FIG. 8, the first and second base materials 3, 3, 4, which are pillar constituent members.
4 and weld the end face of the inner diaphragm plate 5 over the first base material 3 opposed thereto, and at this time, connect the inner diaphragm plate 5 with another opposed second base material 4, 4 respectively. A space for forming a space S for receiving the weld metal is spaced from the end face of the inner diaphragm plate 5 and the backing members 6 are temporarily welded to both ends of the inner diaphragm plate 5 so as to sandwich the space. At the same time, the second preforms 4 and 4 are welded to the first preforms 3 and 3, while passing through the welding holes b formed in advance in the first preform 3 while facing the space S. The diaphragm plate 5, the second base materials 4, 4 and the backing material 6 are integrally connected by electroslag welding.

[0004]

As described above, when integrally connected by electroslag welding, compared with the case of integrally connected by carbon dioxide gas welding in which beads are multi-layered while a welding rod is reciprocated through an opening for construction. ,
Although there is an advantage that welding efficiency is high and high-strength welding can be performed, in this electroslag welding, the amount of heat input to the welded portion is larger than that in carbon dioxide welding (hereinafter, referred to as large heat input as necessary). Because of this large heat input,
There is a drawback that the impact value that affects the toughness of the weld is greatly reduced as compared with carbon dioxide welding.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to improve the toughness of a welded portion by rational improvement and to provide a steel frame with an inner diaphragm plate excellent in strength. The purpose is to:

[0006]

According to the present invention, there is provided a steel frame having an inner diaphragm plate in which an inner diaphragm plate is integrally connected to a steel frame having a closed cross section by electroslag welding. In this state, the end faces of the opposing first base materials are brought into contact with each other so as to be integrally connected, and are spaced apart from each other by opposing second base materials so as to form a space for receiving a weld metal. An inner diaphragm plate is provided, a backing having a through hole for cooling water flowing in a state in which both ends of the inner diaphragm plate are made to protrude to the outer surface of the first base material across the first base material. A material is provided, and the inner diaphragm plate, the second base material, and the backing material are integrally connected by electroslag welding.

[0007]

According to the structure of the steel frame with the inner diaphragm plate of the present invention, the backing material necessary for the electroslag welding is effectively used, and the cooling water is supplied to the cooling water flowing through holes formed in the backing material. By making the fluid flow, the welded portion is cooled, and the influence of large heat input in electroslag welding can be suppressed.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a steel frame with an inner diaphragm plate according to the present invention. An H-shaped steel beam 2 is integrally connected to a box column 1 as a steel frame with an inner diaphragm plate by welding.

FIG. 2 is an exploded perspective view of the box column. The box column 1 has a closed cross section in which first and second base materials 3, 3, 4, 4 facing each other are groove-welded. In addition, the beam 2 is butt-welded to the second base materials 4 and 4, and inside the upper and lower flanges 2 a of the beam 2,
2a and the inner diaphragm plate 5
Are integrally connected by welding.

[0010] The inner diaphragm plate 5 is integrally connected to the inner surface of the base material by electroslag welding as follows. That is, the first and second base materials 3, 3,
As shown in the perspective views of FIGS. 4, 4 and FIGS. 2, 3 and 4, and the cross-sectional view of FIG. An inner diaphragm plate 5 corresponding to the distance between the inner surfaces of the base materials 3 and 3 and having a slightly shorter length on the other side than the distance between the inner surfaces of the second base materials 4 and 4 is prepared. A backing material 6 is temporarily welded to both sides of an end of the plate 5 facing the second base materials 4 and 4 so as to project slightly from the end surface.

The backing material 6 is provided at both ends of a rectangular member 6a corresponding to the length of one side of the inner diaphragm plate 5 with a circular shape having a dimension slightly longer than the thickness of the first base materials 3 and 3. Member 6
b, and a through hole 7 for cooling water flow is formed over the entire length thereof. In a state where the through hole 7 is temporarily welded to the inner diaphragm plate 5, a pair of backing materials 6, 6 are provided on each surface.
Are set to be the same as the dimensions between the inner surfaces of the second base materials 4 and 4.

[0012] Then, at predetermined positions of the first base materials 3 and 3,
A small hole a penetrating the circular member 6b of the backing material 6 is formed, and adjacent small holes a, a of one first base material 3 are formed.
A hole b for welding is formed between them.

Thus, the first and second base materials 3,
Inner diaphragm plate 5 with 3, 4, 4 and backing material 6
As shown in FIG. 3, the circular member 6b of the backing material 6 welded to the inner diaphragm plate 5 is made into a first base material 3, 3 with its end protruding from the outer surface. , And both end edges of the inner diaphragm plate 5 are integrally connected to the inner surfaces of the first base members 3 by welding, and, for example, over one end side of the first base members 3. 5, both end sides of one second base material 4 are integrally connected by groove welding. As shown in FIG. 5, the distance between the second base material 4 and the inner diaphragm plate 5 is a pair of back faces. Weld metal 1 sandwiched between the materials 6 and 6
A space S for receiving 2 is formed, and a hole b for welding is formed so as to face the space S.

The other second base material 4 is first integrally connected to the other end side of the first base materials 3 and 3, and then the first and second jigs 8 and 8 are made of copper and also serve as end tabs. 9, a first jig 8 in which a hole c through which a pair of adjacent circular members 6b penetrate and a small hole d facing the hole b for welding are formed.
Is provided in one first base material 3 and a second jig 9 in which a hole e for closely penetrating a pair of adjacent circular members 6b is formed, is provided in the other first base material 3. Provided.
A space S is formed between the other second base material 4 and the inner diaphragm plate 5 to receive the weld metal 12 facing the welding hole b. As a result, as shown in FIG. It produces a box column 1 having a closed cross section in which two opposing sides of a plate 5 are welded to a first base material 3,3. In the welding up to this point, since the welded portion is widely opened, a means of carbon dioxide welding having a small heat input and a high impact value which affects the toughness of the welded portion is suitably performed.

Next, as shown in FIG. 5, with the first jig 8 facing upward, the first jig 8 is positioned at the upper end (or lower end) of the cooling water flowing through hole 7 formed in the backing material 6. Cooling water supply pipe 1
0 is connected, a cooling water drain pipe 11 is connected to the lower end (or upper end) of the through hole 7, and the powdery deposited metal 12 is injected into the space S through the hole d of the first jig 8. And the solid wire 13 is connected to the tip 14 of the tip.
The nozzle 15 is pulled out of the space S, and the nozzle 15 is sequentially pulled up while the wire 13 is being fed out, so that the inner diaphragm plate 5 and the second base materials 4 and 4 are backed up as shown in FIG. The members 6 and 6 are integrally connected by electroslag welding, whereby the four sides of the inner diaphragm plate 5 are connected to the first and second base members 3 and 3,
A box column 1 with an inner diaphragm plate 5 welded to the inner surfaces of 4, 4 is produced.

Here, the relationship between the heat input and the impact value of the electroslag welding under water cooling according to the present invention, the conventional electroslag welding under natural cooling, and carbon dioxide welding of a welded metal core was examined. The result was as shown in the graph of FIG.

In the figure, black circles indicate the results obtained by electroslag welding under water cooling, white circles indicate the results obtained by electroslag welding under natural cooling, and triangles indicate the results obtained by carbon dioxide gas welding.

From these results, the impact value of electroslag welding under water cooling is not much different from that of carbon dioxide welding.
It is several times higher than electroslag welding by natural cooling, and it is clear that by suppressing the effect of large heat input in electroslag welding by cooling, it is possible to avoid a decrease in toughness of the weld due to large heat input. is there.

In the above configuration, it is easy to manufacture the box pillar 1 according to the dimensions. At this time, the diameter of the small hole a formed in the first base material 3 is set to the circular member of the backing material 6. 6b, the circular member 6 is inserted into the small hole a.
This makes it difficult to insert the small hole b, so that the diameter of the small hole a is generally designed to be relatively larger than that of the circular member 6b.

However, if the relationship between the small hole a and the circular member 6b is kept as it is, there is a disadvantage that the powdery deposited metal 12 put in the space S overflows or slag leaks out during welding. . To solve this inconvenience,
The second in which the hole e for penetrating the circular member 6b in a watertight manner is formed.
The jig 9 is set on the other hand, and on the other hand, the first jig 8
Is provided.

In the above embodiment, the box column is exemplified as the steel frame having the closed cross section. However, the electroslag welding according to the present invention is carried out for steel frames such as box beams, box truss members, and box braces. It is possible.

Although the non-consumable nozzle in which the nozzle 15 is sequentially pulled up has been described as the electroslag welding, the electroslag welding may be performed in a consumable nozzle form.

Further, the backing material 6 is temporarily welded so as to protrude slightly from the end face of the inner diaphragm plate 5, and the circular member 6 b of the backing material 6 is inserted into the small hole a of the first base material 3. After the insertion, the inner diaphragm plate 5 is
However, the above-described temporary welding is omitted, and the inner diaphragm plate 5 is connected to the first diaphragm 3 in a state where a predetermined distance is formed between the first base material 3 and the inner diaphragm plate 5. You may make it weld to the base material 3.

[0024]

As described above, according to the steel frame with the inner diaphragm plate of the present invention, the backing material necessary for the electroslag welding is effectively used, and both ends of the backing material are respectively connected to the outer surface of the base material. And through-holes for cooling water flow are formed in the through-holes, and cooling water flows through the through-holes to cool the weld with water. This makes the impact value that affects the toughness of the welded area several times higher than that of electroslag welding by natural cooling, avoiding a decrease in the toughness of the welded area due to large heat input, and making a reasonable improvement as a whole. As a result, the toughness of the weld is improved, and a steel frame with an inner diaphragm plate excellent in strength can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a continuous portion of a beam with respect to a box column.

FIG. 2 is an exploded perspective view of a box column.

FIG. 3 is a perspective view illustrating a welding state of an inner diaphragm plate to a first base material.

FIG. 4 is a partially cutaway perspective view of a box column.

FIG. 5 is a cross-sectional view illustrating electroslag welding.

FIG. 6 is a sectional view of an electroslag welding portion.

FIG. 7 is a graph showing a relative relationship between a heat input amount and an impact value by various welding means.

FIG. 8 is an exploded perspective view showing a box column formed by conventional electroslag welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... 1st base material 4 ... 2nd base material 5 ... Inner diaphragm plate 6 ... Backing material 7 ... Through-hole 12 ... Weld metal S ... Space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04C 3/32 E04B 1/24 B23K 9/00 501

Claims (1)

(57) [Claims] 1. A steel frame with an inner diaphragm plate in which an inner diaphragm plate is integrally connected to a steel frame having a closed cross section by electroslag welding, wherein the end faces abut against the first base materials facing each other and are integrally connected. The inner diaphragm plate is provided in a state where a space for forming a weld metal is formed between the first base material and a second base material facing each other, and the first base material is interposed therebetween. Over each other, in a state where both ends thereof are projected through the outer surface of the first base material,
An inner diaphragm, wherein a backing material having a through hole for cooling water flow is provided, and the inner diaphragm plate, the second base material, and the backing material are integrally connected by electroslag welding. Steel frame with plate.