JPH08155746A - Forming method for beam junction part of steel pipe column - Google Patents

Abstract

PURPOSE: To form steel pipe for through column with a column beam junction part as a whole by inserting and shrinkage-fitting a short thick-wall steel pipe in a steel pipe for column and forming a column beam junction part of double pipe structure in order to reinforce a junction part between the steel pipe for through column and the beam. CONSTITUTION: After inserting a steel pipe 1 for through column and a short and a little large-diameter steel pipe 2 whose cross section is similar to it from one end surface of the steel pipe 1 for through column and heating them roughly uniformly to a prescribed temperature, it is confirmed that the thick-wall steel pipe 2 exists at the column beam junction part position of the steel pipe 1 for through cold. Before heating temperature goes down, they are compressed from the outside, hot-drawn, and fitted to each other to form and cool a double pipe structure, and form a column beam junction part by shrinkage-fitting of double pipe reinforcing between steel pipes each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a column beam joint of a column penetrating type and a steel pipe for a through column having a beam joint of a double pipe structure, which is used for building a steel structure.

[0002]

2. Description of the Related Art Axial forces, bending moments, and shear forces of each member are concentrated in a beam-column joint, and are balanced in a narrow portion of the joint, and particularly large horizontal forces and accelerations such as seismic forces act on the building. At this time, the stress state of the joint (shearing force is outstanding) becomes a problem, so it is necessary to design the joint so as to have sufficient proof strength and rigidity. Specifically, it should be noted that the stress transmission is smooth, the workability is good, and the detailed structure is easy to inspect.

The type and structure of joints (joints) of column beams are roughly classified into fastener joints such as bolts and high-strength bolts and weld joints according to the jointing method, and soft joints and rigid joints according to mechanical properties. In a structure using a steel pipe column (column), a welded joint is generally used because the member cross section is a closed type and fastener joining is not easy. Therefore, a rigid joint is required to transmit a large bending moment and a large shearing force, and therefore the joint portion of the steel pipe column is required to have sufficient proof strength and rigidity corresponding thereto. The structure of column beam joints using square steel pipes can be roughly classified into factory-welded bracket type and field-welded type. Generally, the bracket type is widely adopted in terms of workability and reliability.

Known bracket types are classified into a column penetration type and a beam penetration type. (A) The column-split type diaphragm diaphragm joint has a structure in which a split diaphragm is welded to the inner wall of the column corresponding to each beam joint, but since the diaphragm is split, the joint It is inevitable that the structure and strength of the parts will be anisotropic. In addition, it is not easy to weld diaphragms corresponding to all the joints in a narrow steel pipe column with poor workability. In the first place, the welding work becomes a bottleneck for economic efficiency.

As a solution to this problem, the inner diaphragm structure of the joint portion traverses the through column at the center of the joint portion,
After inserting and welding the diaphragm from each end face to the inner wall of the column corresponding to the beam joint, butt welding the transverse part of the column to install the inner diaphragm corresponding to all the joints in the steel pipe column. However, in the above-mentioned type, the through column is subdivided to reduce the strength, or due to its structure, it is made of a material that crosses the joint that requires transmission of a large bending moment and shearing force. Another problem is that the welded structure is unstable and thin and the welded portion becomes relatively long.

The joint part of the through-diaphragm structure is such that the column is short in the longitudinal axis direction and cut at a right angle to form a dice, and the end faces are attached and welded so as to cover the diaphragms respectively, and the opposite face is the column end face. Butt welding is applied to each of the beam joints to form a through-diaphragm, and the structure is complicated, there are many steps, and the welding process is relatively long and the shape error is likely to occur. Since it can be automated and is relatively easy to mold, it is widely used.

(B) The joint portion of the outer diaphragm structure belonging to the column penetration type has a structure in which the outer diaphragm (stiffener ring) is welded to the outer wall of each joint portion of the through column. It has not been widely spread because it is not economical to take and there are problems such as difficulty in processing the diaphragm structure after construction. By the way, not limited to the conventionally known joint structure, in short, in the case of rigid joint, since the column beam joint is required to transmit a large bending moment and shear force, the joint of the steel pipe column is It is necessary for the structure to provide sufficient proof strength and rigidity corresponding to.

(C) It is not always necessary to adopt the above-described conventional column beam connection for a low-rise building of about 3 to 5 floors. For example, a thick-walled chevron steel with a length equal to the joint is joined and welded to the four faces of the outer wall of the beam joint in a rectangular column steel tube for through columns, and the joint of the column material is reinforced. Have already been proposed.

On the other hand, regarding the technology improved and strengthened including the structure of the column beam joint portion having a shape close to the above-mentioned shape and the forming method, the applicant of the present invention previously mentioned, "Method of forming beam joint portion of steel pipe column by shrink fitting. And columns "(1994 Patent Applications No. 251538, 251939)
However, due to the construction method, it is not possible to eliminate the difficulty and risk of the work such as handling and fitting the members while they are heated in the process. Since some areas were not efficient, we made further improvements to create the present invention.

The method for forming the joint portion of the beam penetrating type / through diaphragm, which is widely used in the industry at present, is outlined below with reference to FIG. 2. In the figure, (a) shows the thick wall of the column material. FIG. 1B is a perspective view of the rectangular steel pipe 1, and shows a step of cutting the steel pipe 1 according to the specifications and forming dice-shaped members 8 each forming a joint portion. In (c), a step of performing groove processing 9 on each cut end surface of the steel pipe is shown, and a backing plate (plate) for butt welding is temporarily welded to the inside along the end surface. Separately, two diaphragms 10 are prepared for the respective connection parts.

FIG. 1D is a perspective view of a rectangular steel pipe for a column in which a designed connection portion is formed. Generally, for forming the square steel pipe, the diaphragm 10 is covered with respect to each end face of the dice-shaped member 8. After assembling and centering so as to perform butt welding between the two, the end face of the steel pipe for column 1 is assembled on the opposite side of these diaphragms 10 and the butt welding is performed between the two, which is considered to require multiple steps. There is. Moreover, since the steel pipes are cut and connected by butt welding, weak points are likely to occur, and the linearity of the column steel pipe may be impaired.

[0012]

DISCLOSURE OF THE INVENTION The present invention eliminates or ameliorates the above-described problems associated with the conventionally known column beam joints, joint structures and their formation, and makes the structure and construction method reliable and simple. We provide a highly efficient forming method for forming through columns with uniform and high-quality column beam joints that can be delivered promptly according to various specifications, thus saving column forming labor and steel pipes. The objective is to streamline material distribution and inventory management and reduce the number of assembly process steps.

[0013]

In order to achieve the above-mentioned object, the present invention has the respective constituent features as described below. (1) The thickness of the first, second, third, etc. beams that are long in the axial direction, have a similar right-angled cross-section, and have a slightly larger inner dimension, and have a beam length of each floor or an axial length that is a predetermined length longer than the same length. The thick steel pipe is inserted from the end of one through-column steel pipe long in the axial direction to form a double pipe structure portion, and the first thick steel pipe is high-frequency heated to a predetermined temperature, By pressing down from the outside by plastic working and aligning the location with the first column beam joint position specified in advance for the steel pipe for columns, the steel pipe is joined to the steel pipe for columns through the pipe pipe as much as possible. After cooling uniformly, form the first column beam joint part of the double-tube shrink fit with the steel pipe for the column through the same steel pipe, and for the second thick steel pipe also through the same process as above for the column The second column beam joint part of the double pipe shrink fit to the steel pipe A beam-joint forming method for a steel pipe column, which is characterized in that the third and subsequent column beam-joint portions are sequentially formed in the same manner for 3 thick-walled steel pipes and below.

(2) First and second beam joints of each floor, which are long in the axial direction, have a similar right-angled cross-section, and have a slightly larger inner dimension, and have a length in the axial direction that is a predetermined length longer than the beam joints of the respective floors or the same length.
2, 3 ... Thick-walled steel pipes are inserted from the ends of one axially long steel pipe for column to form double-pipe structure parts, and the first thick-walled steel pipe is heated to a predetermined temperature. High-frequency heating, pressing from the outside by hot plastic working to narrow it down, and the relevant portion is first specified in advance for the column steel pipe.
No. 1 of the double-beam shrink-fitting with respect to the column steel pipe through the steel pipe through the steel pipe after being aligned with the column beam joint position and joining the steel pipe through the steel pipe for the column through cooling. A column-beam joint is formed, and the second thick-walled steel pipe is also subjected to the same process as above to form the second column-beam joint by double-tube shrink fitting with the through-column steel pipe and the third thick-walled pipe. A steel pipe column having column-beam joints, which is characterized in that third and subsequent column-beam joints are formed in the same manner for steel pipes and below.

[0015]

[Operation] A slightly larger inner diameter and a similar cross section are provided with respect to the outer diameter of the cross section of the steel pipe for a through column that is long in the axial direction.
Column-beam joints or first, second, third, ... thick-walled steel pipes having a predetermined axial length longer than the column-beam joints are prepared, and one of the steel pipes for columns is passed through the thick-walled steel pipes. It is fitted in the axial direction from the side end and is arranged near each column beam joint position, and the first thick steel pipe is locally heated and softened to a required temperature at that position, and the position of the heated steel pipe is also increased. After confirming that it is exactly aligned with the position of the first column beam joint of the through column steel pipe, the outer diameter of the steel pipe is narrowed down from the outside by hot plastic working, and the steel pipe for through column is axially appointed at a predetermined part. Crimping to make it as uniform as possible, for example, let it cool naturally to reduce the diameter of the heated steel pipe, tighten the outer diameter of the steel pipe for the through column, and form a double-tube shrink-fitting structure at the column beam joints. .

At this time, the connecting and cooling means which impairs the linearity in the axial direction of the connected steel pipes for through columns must be eliminated. Also, after shrink fitting, pay attention to temperature control so that the yield point or proof stress, tensile strength, yield ratio, and elongation of the material of the steel pipe column in the vicinity will fall within a predetermined range. The above-described steps are sequentially or temporarily applied to the first, second, third, ... thick-walled steel pipes to form a double-column shrink-fitting structure in the axial direction of the through-column steel pipes. , 3rd pillar beam joint is formed.

The portion corresponding to the beam-column joint by shrink-fitting has a double-wall structure in which the plate thicknesses overlap each other, so that the structural strength is greater than other parts of the through-column steel pipe. Even if it is selected as the beam joint, the above conditions are satisfied. Of course, the strength for bolting the end surface of the beam member to the location is sufficient. If necessary, at the relevant location,
It is not impossible to weld the end faces of beam members.

According to such a construction method and structure, since the thick-walled steel pipes forming the beam-column joints can be assembled, positioned and moved with respect to the through-column steel pipes at room temperature, there is a risk of work. And the equipment can be simplified, and since the outer diameter is narrowed down by hot plastic working, reliable fitting and shrink fitting are possible. In addition, just by stocking standard steel pipe materials, it is possible to immediately respond to orders and specifications and form the desired through-column steel pipe with beam joints, so of course it is easy to manage inventory.
An efficient immediate delivery system for through columns with beam joints of various specifications can be established.

[0019]

[Examples] The method of the present invention and a steel pipe column formed by the same method will be described below with reference to the drawings. The types of thick-walled steel pipe that are effective within the technical level at the time of the application
Many handling methods are known, and it is common general knowledge to employ them in the method of the present invention. Therefore, the means used in the method of the present invention is simply converted into another known method. The technique does not depart from the technical scope of the present invention.

FIG. 1 is a schematic perspective view showing a steel pipe for a through column formed by the method of the present invention and the method.
In (a), 1 is a square steel pipe material, for example, the material is SS400 or SM490, the length of the side of the outer diameter of the cross section is 250 × 250 mm, the plate thickness is 12 mm, the axial length is 15 m This is a square steel tube for through columns that seamlessly passes through.

In (b), 2 is the same material as the steel pipe 1 and has a similar cross-sectional shape with an inner diameter approximately 5 mm larger than the outer diameter of the rectangular steel pipe material 1, for example, an outer diameter 35
Formed by cutting a square steel pipe with a 0 mm square and a plate thickness of 22 mm, and the axial length is a beam-column joint or slightly longer, for example 60
The first thick square steel pipe 3 having a thickness of 0 to 800 mm is a second thick square steel pipe having the same shape and structure as the first square steel pipe.

As shown in (c), one end face of each of the first thick-walled rectangular steel pipe 2 and the second thick-walled rectangular steel pipe 3 ... Is inserted into one end of the columnar rectangular steel pipe 1 to form a columnar rectangular pipe. The column beams are to be respectively formed in the longitudinal direction of the steel pipe 1 and are moved to the positions of the beam joints, and are arranged at or near the positions where they should be. At that time, the first thick-walled rectangular steel pipe 2, the second thick-walled rectangular steel pipe 3, ...
Since the inner diameter of the cross section of ... Is approximately 5 to 6 mm larger than the outer diameter of the rectangular steel pipe material 1 for columns, there may be some manufacturing errors in the cross sectional shapes of both, and since it is a cold operation. There is no time restriction, and there is no inconvenience in inserting and moving the first thick-walled rectangular steel tube 2 ... into the rectangular steel tube material for column 1 described above, and it is possible to accurately arrange it at a predetermined position. .

In (d), the first thick-walled rectangular steel pipe 2 is inserted into the rectangular steel pipe material 1 for a column, and the first thick-walled rectangular steel pipe 2 arranged at a predetermined beam-column joint is uniformly heated to a required temperature, for example, about 400 to 900 ° C. To do. Here, it is desirable to exclusively use the high frequency heating to heat only the first thick-walled rectangular steel pipe 2 main body. However, any energy such as electric power, gas, petroleum, etc. can be selected as the heating source for the processing. At that time, the peripheral wall of the rectangular steel tube for column 1 is not heated as much as possible, and care is taken so that the strength of the rectangular steel tube 1 does not decrease due to heating.

Therefore, if necessary, the first thick-walled rectangular steel pipe 2 is heated by another heating furnace, and this is inserted into the columnar rectangular steel pipe 1 at a predetermined first column beam joint position in the longitudinal axis direction.
You may arrange it. Hereinafter, the same applies to the second thick-walled rectangular steel pipe 3. The processing of the second thick-walled rectangular steel pipe 3 may be performed after the drawing process of the first thick-walled rectangular steel pipe 2. However, the processing of the first thick-walled rectangular steel pipe 2, the second thick-walled rectangular steel pipe 3, ... May be performed simultaneously.

In (e), it is confirmed that the heated first thick-walled rectangular steel pipe 2 occupies the position of the first column beam joint portion of the rectangular steel pipe material 1 for columns in the longitudinal axis direction, and then the centering is performed, Before the heating temperature decreases, hot plastic working is performed from the outside by pressing to compress and squeeze in the vertical direction, and the first thick-walled rectangular steel tube 2 is fitted onto the outer periphery of the rectangular steel tube 1 for columns. However, the inner diameter of the first thick-walled rectangular steel tube 2 is the same as or substantially the same as the outer diameter of the rectangular steel tube for column 1. Square steel pipe material for columns 1
Since it has cold strength at that time, it is unlikely to be deformed in the longitudinal axis direction by some external force. Second thick-walled square steel pipe 3 ... The following is also the first thick-walled square steel pipe 2
Same as the processing for.

In (f), after the processing as described in the item (e), the first thick-walled square steel pipe 2, the second thick-walled square steel pipe 3 ... Position of the first pillar beam joint in the direction,
When the double pipe fitting structure is formed so as to occupy the position of the second pillar beam connection portion, the first thick-walled square steel pipe 2, the second thick-walled square steel pipe 3 ... and the like are sequentially and as uniformly as possible. Allow to cool naturally. 1st thick-walled square steel pipe 2, 2nd thick-walled square steel pipe 3 ... In the following, the inner diameter and the outer diameter of the rectangular steel pipe blank 1 for columns are substantially the same diameter due to the narrowing of hot plasticity by pressing. Therefore, the outer diameter of the rectangular steel pipe material for column 1 is tightened by an amount that shrinks as the heating temperature decreases, and a shrink fit structure is formed in the column beam joint.

At this time, it is necessary to carefully perform cooling work so as not to impair the axial linearity of the through column steel pipe. Also, pay attention to temperature control so that the characteristics of the material do not fall below the specified range. If necessary, the structure of the column beam joint can be made stronger by welding between the end faces of both steel pipes.

FIG. 1 (f) shows, in sequence, the steps described above.
It is a perspective view of the steel pipe for through columns with the formed column beam joint part, and the column beam joint part of each double pipe fitting structure is a specification of the same diameter in the longitudinal axis direction of the rectangular steel pipe 1 for through columns, respectively. As described above, they are arranged and fixed at intervals of h ₁ , h _2, ... H n. The through column steel tube 1 can be used with any end in the longitudinal axis direction facing upward. The standard of the rectangular steel pipe for through column that can be used in this embodiment is that the material is SS400 or SM490, the side length is about 200 × 200 mm to 400 × 400 mm, and the plate thickness is about 6 to 19 mm. It is assumed that The above-mentioned construction method can be applied not only to square steel pipes but also to round steel pipes.

[0029]

The method and column of the present invention are as described above. (1) Since the column-beam joints of the through column are reinforced by the double-tube shrink-fitting structure, the necessary strength is obtained. Can be held. (2) Compared to the conventionally known structure of the column beam joint portion, since no diaphragm is used, there is an advantage that the column beam joint structure is very simple. (3) By adjusting the insertion height of the double pipe fitting according to the specifications, it is possible to process various types of orders promptly, and it is possible to maintain the stock management of steel pipes and prepare the immediate delivery system of products. Becomes (4) Since only one standard steel pipe or a steel pipe having almost the same diameter needs to be cut, man-hours and time can be saved.

(5) Since members such as a backing plate and a through diaphragm are not required, and welding processing, welding points and inspection are not required, a significant cost reduction can be achieved. (6) It is not necessary to form a groove on each end face as in the case of forming a conventionally known connecting member. (7) Compared with the conventional method for forming the post of the beam post, for example, the method of forming the through-beam type / through diaphragm, the number of steps can be reduced and it is extremely economical. (8) It is possible to provide a highly reliable and uniform product by the processing in the factory.

(9) The structure of the joint portion between the steel pipe column and the beam can be simplified (by the joint bolt), and the assembling of the structure can be saved. (10) Since the steel pipe for the through column is constructed, it is possible to assemble a structure having high strength reliability and high accuracy.
And so on, it is possible to obtain a special action and effect which cannot be expected from the conventional method of forming the column beam joint portion and the column which have been conventionally carried out.

[Brief description of drawings]

FIG. 1 is a perspective view of a through-column steel pipe forming process including a column beam joint portion being formed based on the method of the present invention.

FIG. 2 is a view showing an example of a conventionally known method for forming a beam penetration type / through diaphragm joint.

[Explanation of symbols]

 1 Rectangular steel pipe material for columns 2 1st thick-walled rectangular steel pipe 3 2nd thick-walled rectangular steel pipe 4 1st column beam joint part 5 2nd column beam beam joint part.

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[Procedure amendment]

[Submission date] December 16, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

Claims (2)

[Claims] 1. A first, second, third, etc. axially long, axially similar cross-section and slightly larger inward dimension, each having a beam joint of each floor or an axial length that is a predetermined length longer than the same length.
The thick-walled steel pipe is inserted from the end of one of the through-column steel pipes long in the axial direction to form double pipe structure parts, and the first thick-walled steel pipe is heated to a predetermined temperature by high frequency, By pressing from the outside by hot plastic working and narrowing down, the steel pipe is aligned with the first column beam joint position specified in advance for the column steel pipe, and then joined to the through column steel pipe and as uniformly as possible. After cooling, the first column beam-joint part of the double-tube shrink fit is formed to the column steel pipe through the same steel pipe, and the second thick steel pipe is also formed into the through column steel pipe based on the same process as above. On the other hand, a steel pipe column characterized in that the second column beam-joint portion of the double-tube shrink-fitting is formed in the same manner for the third thick-walled steel pipe and the like, and the column beam joint portion of the third or less column is formed sequentially. Beam joint forming method. 2. A first, a second, a third, ... A beam joint on each floor, which has a similar axial cross section and a slightly larger cross section, and has an axial length that is a predetermined length longer than the beam joints of each floor or the same length.
The thick-walled steel pipe is inserted from the end of one of the through-column steel pipes long in the axial direction to form double pipe structure parts, and the first thick-walled steel pipe is heated to a predetermined temperature by high frequency, By pressing from the outside by hot plastic working and narrowing down, the steel pipe is aligned with the first column beam joint position specified in advance for the column steel pipe, and then joined to the through column steel pipe and as uniformly as possible. After cooling, the first column beam-joint part of the double-tube shrink fit is formed to the column steel pipe through the same steel pipe, and the second thick steel pipe is also formed into the through column steel pipe based on the same process as above. On the other hand, a column beam which is characterized in that the second column beam-joint portion of the double-tube shrink fit is formed in the same manner for the third thick-wall steel pipe and the like, and the column beam joint portions of the third and subsequent columns are sequentially formed. Steel pipe column with joints.