JPH0860747A - Thickly reinforced steel pipe joint, steel pipe pillar, and manufacture thereof - Google Patents

Abstract

PURPOSE: To simply and firmly connect opposite end sections of a pair of steel pipes with no welding. CONSTITUTION: Opposite end sections of a pair of steel pipes 11, 11 arranged in the nearly butted state are made thick sections 11a, 11a thickened with pipe walls by induction heating and compression respectively. Connecting materials 12 overlapped on the thick sections 11a, 11a of both steel pipes 11, 11 are provided, and the connecting materials 12 and thick sections 11a, 11a are fastened with bolts 13 inserted into holes 14, 15 formed on the connecting materials 12 and thick sections 11a, 11a. A one-side bolt is used for the bolt 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickened steel pipe joint, a steel pipe column, and a method for producing the same, which are generally applied to steel frame frames of buildings and other joints of steel pipes for various purposes.

[0002]

2. Description of the Related Art Conventionally, when rigidly joining upper and lower rectangular steel pipe columns, generally, the ends of the upper and lower steel pipe columns 50 and 51 are welded together on site as shown in FIG. It is joined by 52. However, this kind of on-site welding not only adversely affects the working environment and depends on the weather, but also the finish of the welding depends on the skill of the welding operator to a high degree and the quality becomes unstable. There are a lot of problems such as putting effort into.

For this reason, various joints have been proposed in which bolts are joined together with a connecting plate instead of welding, but it is difficult to perform firm joining. That is, in the case of bolt connection, since a large number of bolt holes are opened in the steel pipe column, the cross-sectional area of the steel pipe column becomes smaller by the amount of the bolt hole, so-called bolt hole defect occurs, and the strength of this portion is different from that of other steel pipe columns. Lower than the part. Also, in the case of bolt connection, since the steel pipe column has a closed cross section, complicated work such as pre-preparing a nut inside or cutting a screw is required, and the joining work and pretreatment work are troublesome. It takes. The above-mentioned problems generally occur not only in steel pipe columns but also in steel pipe joints.

An object of the present invention is to provide a thickened reinforcing steel pipe joint, a steel pipe column, and a method for manufacturing the same, which can easily and firmly join opposite ends of a pair of steel pipes without welding.

[0005]

The thickened reinforced steel pipe joint of the present invention is a thick walled pipe in which opposed ends of a pair of steel pipes arranged in a substantially butted state are made thicker by heating and compressing the pipe wall. And a connecting member that overlaps between the thick-walled portions of both steel pipes is provided, and the connecting member and the thick-walled portion are fastened with a bolt inserted between the holes formed in the connecting member and the thick-walled portion. It is a thing. For heating when forming the thick portion, induction heating or a heating method using a laser beam can be adopted. A one side bolt may be used as the bolt. Further, the bolt used to fasten one of the pair of steel pipes to the connecting member may be a high-strength bolt, and the bolt used to fasten the other steel pipe to the connecting member may be a one-side bolt. Here, the "one-side bolt" is a general term for a shaft-shaped tightening metal fitting that can be tightened by an operation from one end side and the other end is plastically deformed in a diameter-expanded state, and is also called a blind bolt or the like. Has been. Further, the thickening ratio of the thick portion to the non-thick portion may be different between the thick portions at the opposite ends of the pair of steel pipes. The steel pipe column of the present invention uses the thickened reinforcing steel pipe joint having the above-mentioned configuration and uses a one-side bolt for the bolt. The method for manufacturing a thickened steel pipe joint of the present invention comprises a step of induction heating the end portion of the steel pipe and compressing the heated portion in the longitudinal direction to form a locally thick portion at the end portion of the steel pipe, The step of arranging the thick ends of the pair of steel pipes having the thick portions in a substantially butted state with each other, the step of adding a connecting material that overlaps between the thick portions of both steel tubes, and the connecting material and the thickness And a step of fastening the thick portion with a bolt inserted between the holes formed in the connecting member and the thick portion.

[0006]

According to this structure, since the end of the steel pipe to be bolted together with the connecting member is formed of a thick portion, the strength of the cross section is ensured and firm joining can be performed even if a large number of bolt holes are formed. When one-sided bolts are used, it is not necessary to perform back nut welding or thread processing on the inside of the steel pipe having a closed cross section, which simplifies the joining work. When a high-strength bolt is used for one of the steel pipes, the connecting member is attached to the steel pipe with the high-strength bolt, and then the other steel pipe and the connecting member are fastened with one-side bolts. The thick wall portion of the steel pipe can be easily formed by induction heating the end portion of the steel pipe and compressing the heated portion in the longitudinal direction, as in the method of the present invention. Therefore, for example, it can be formed at a lower cost than the case where the thick portion is formed by centrifugal casting or the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. This thickened steel pipe fitting is shown in Fig. 1 (B).
As shown in FIG. 1 (C), the opposite end portions of the pair of upper and lower rectangular steel pipes 11, 11 arranged in a substantially butted state with each other are thickened portions 11a in which the wall thicknesses of the respective pipe walls are integrally thickened,
A connecting member 12 that overlaps between the thick-walled portions 11a and 11a of both steel pipes 11 and 11 is bolted to the thick-walled portions 11a and 11a by a one-side bolt 13. Although the thick portion 11a is swelled on both the inner and outer surfaces of the steel pipe 11 in the illustrated example, it may be swelled only on the inner surface side as in the example of FIG. 19 (A), or as in the example of FIG. 19 (B). Alternatively, it may be bulged only on the outer surface side. Connecting material 12
Is a flat plate-shaped steel plate, and is laminated on each of the four side surfaces of the rectangular steel pipe 11. The connecting member 12 and the thick wall portions 11a, 11a of the double-sided steel pipes 11, 11 have a plurality of bolt insertion holes 14, respectively.
15 is formed, and the one side bolt 13 is inserted into each of the bolt insertion holes 14 and 15 and tightened. The steel pipes 11 and 11 thus joined are used, for example, as a steel pipe column of a steel frame building. In that case, the joining work by the one side bolt 13 is performed on site. Also, the connecting member 12
As shown in the example of FIG. 16, may be provided on both the inner and outer surfaces of the thick-walled portion 11a.

FIG. 2 is a process diagram showing a method for manufacturing the above-mentioned thickened steel pipe joint. That is, the rectangular steel pipe 1 shown in FIG. 2 (A) is subjected to thickening processing by induction heating and compression to form a rectangular steel pipe 11 having a locally thick portion 11a at the end as shown in FIG. 2 (B). The thick portion 11a
2C, the thick ends of the pair of rectangular steel pipes 11, 11 are arranged in a substantially butted state with each other, and the connecting members overlap between the thick portions 11a, 11a of both steel pipes 11, 11. 12, and the connecting member 12 and the thick portion 1
2a is fastened with the one side bolt 13 inserted between the bolt insertion holes 14 and 15 formed in the connecting member 12 and the thick portion 11a as shown in FIG. 2D.

According to the thickened reinforced steel pipe joint having this structure, since the joint end of the steel pipe 11 is formed of the integral thick portion 11a,
Even if a large number of bolt insertion holes 15 are formed, the strength of the cross section equal to or higher than that of the non-thickened portion (the portion that remains as the base material before the thickening processing) can be secured regardless of the lack of bolt holes, and a firm joining is achieved. Can be done. In addition, since the one-side bolt 13 is used, it is not necessary to prepare nuts or thread the inside of the steel pipe 11, and even when it is used as a steel pipe column, it can be simply and quickly joined on site. As the one-side bolt 13, one having a tightening force similar to that of a high-strength bolt has been developed as described later, and rigid joining can be performed by using such a one-side bolt. As described above, by forming the thick portion 11a of the steel pipe 11 and combining the one-side bolts 13, it is possible to perform firm joining with a simple configuration and a simple joining operation.
The thick portion 11a can be easily formed by, for example, the following method.

FIG. 3 is a sectional view schematically showing an example of a processing apparatus used for performing the thickness increasing processing by the induction heating and compression. In FIG. 3, of the steel pipe 1 to be thickened, the end of the thickened steel pipe portion 1 a located behind the heating part 2 in the traveling direction of the heating part 2 is fixed in position by a stopper 3.・ Retained. The end portion of the steel pipe portion 1b of the steel pipe 1 which is located on the front side and has not yet been thickened is compressed and fed by the compression device 4. The compression device 4 includes a clamp 5 that holds one end of the steel pipe 1, a hydraulic cylinder 6 that moves the clamp 5, a hydraulic device 7, a compression amount detector 8 that detects the moving position of the clamp 5, and the like. The hydraulic device 7 includes a servo valve for controlling the flow rate of the pressure oil supplied to the hydraulic cylinder 6 and a control device for the servo valve, and the position of the clamp 5 and its moving speed are arbitrarily adjusted by the control of the servo valve. It is possible. The heating device 9 is an annular body capable of locally inductively heating a small region in the longitudinal direction of the steel pipe 1 to a plastically deformable temperature to form the heating unit 2, and a high frequency heating coil is used here. This heating device 9 is provided with a passage for a cooling medium 10 such as cooling water inside and the cooling medium 1
A discharge hole for spraying 0 to the rear end portion in the moving direction of the heating unit 2 is provided. The moving device 30 is for moving the heating device 9 in the longitudinal direction of the steel pipe 1, and includes a moving table 31 that holds the heating device 9 and moves, a ball screw 32 that moves the moving table 31, and a ball thereof. Drive motor 33 for rotating screw 32, and drive motor 3 thereof
A heating device position detector 34 and the like for detecting the position of the movable table 31, that is, the position of the heating device 9 in the longitudinal direction of the steel pipe 1 from the rotational position of 3, are provided. The drive motor 33 used here is a motor whose rotation speed can be freely controlled. Therefore, the moving speed of the heating device 9 can be freely changed by changing the rotation speed of the drive motor 33. The moving table 31 is equipped with a power supply device (not shown) for energizing the heating device 9. In the power supply device used here, the heating device 9 is the heating part 2 of the steel pipe 1.
It is configured such that the effective supply amount per unit time can be controlled. The processing device of FIG. 3 is controlled by the control device 35. The control device 35 controls the compression feed speed of the steel pipe 1 by the compression device 4, that is, the compression speed V, and the moving speed of the heating device 9 by the moving device 30, that is, the heating unit 2.
It is provided with a function of performing program control so that the relative moving speed W of the heating portion 2 with respect to the steel pipe portion 1a located on the rear side of the is changed in accordance with a predetermined characteristic curve set in advance.

Next, a method of thickening processing performed by using the processing apparatus having the above configuration will be described. Now, with respect to the steel pipe 1 before the thickness increase processing, the thickness increase is started from the position P ₁ to gradually increase the thickness, and the thickness is increased so that the thickness is constant from the position P ₂ to the position P _3. and, thereafter, gradually reduces the thickness to the position P _4, and ends the thick meat at that position P _4. First, prior to the thickening process, a desired characteristic curve of the compression speed V and the moving speed W of the heating part 2 with respect to the longitudinal position of the steel pipe, for example, characteristic curves 20 and 21 shown in FIG. 5 are set in the control device 35. At the same time, the control device 35 controls the heating device 9 to supply the effective amount of heat per unit time to the heating part 2 by the heating device 9 and the moving speed S of the heating part 2 relative to the steel pipe portion 1b located in front of the heating part 2. The characteristic curve of the effective heat supply amount is set so that the ratio with (= V + W) becomes constant. Next, the heating device 9 is set at the position P ₁ of the steel pipe 1 to start energization, and the heating of the steel pipe 1 is started. That is,
When the compression device 4 pushes one end of the steel pipe 1, the heating portion 2
The steel pipe 1 is pushed in to increase the thickness. Drive motor 3 at the same time
3 moves the heating device 9 in the longitudinal direction of the steel pipe 1 to gradually move the heating unit 2 in the longitudinal direction of the steel pipe 1 and gradually move the thickening position. At the same time, the heating device 9 sprays the cooling medium 10 on the portion immediately after the thickness increase to cool the portion, and stops the portion from further increasing the thickness. In this way, the steel pipe 1
The thickening process is continuously performed in the longitudinal direction of.

During the thickening process, the control device 35 controls the compression device 4 and the drive motor 33 so that the compression speed V and the moving speed W of the heating portion 2 are set in advance in a characteristic curve (characteristic curve 20 in FIG. 4). , 21). Therefore, the thickness increase rate T, which is the ratio V / W of the two, is
As shown in, the area at the beginning of processing (position P ₁ to position P
₂ ) and gradually increases in the steady machining area (between positions P ₂ and P ₃ ), and becomes constant at the end of machining (position P ₂ ).
_It gradually decreases between ₃ and the position P ₄ . Further, during this processing, the control device 35 heats the heating device 9 so that the ratio of the effective amount of heat supplied per unit time to the heating unit 2 and the relative moving speed S of the heating unit 2 becomes constant. Device 9
Since the effective amount of heat supplied is controlled, the heating unit 2 is always kept at a substantially constant temperature.

In this way, the thickness increase rate T gradually increases in the area at the beginning of processing, the thickness increase rate T is kept constant in the steady processing area, and the rate of thickness increase T gradually decreases in the area at the end of processing. Then, as shown in FIG. 4, in the thick portion 1a of the steel pipe 1, a smooth gradient having a gradually increasing wall thickness is formed in the region 1a ₁ at the beginning of the wall thickness increase, and a steady wall having a constant wall thickness is formed behind the region 1a _1. Thick area 1
a ₀ is formed, and a smooth gradient with a gradually increasing thickness increase rate is formed in the area 1 a ₂ at the end of the increase in the thickness increase. As described above, in the thickness increasing process, it is possible to control so that the thickness increasing rate does not suddenly change during the process. Further, in the initial region of the thickening process, as shown exaggeratedly in FIG. 7, since the cooling medium 10 is sprayed on the smooth sloped surface, the cooling medium 10 flows smoothly and the cooling effect is stabilized. Therefore, it is possible to perform stable thickness increase processing, and it is also possible to perform thickness increase processing with a high thickness increase rate exceeding 100%. Further, the steel pipe locally thickened obtained by this thickening process has smooth gradients α ₁ and α ₂ (Fig. 4) at both ends of the thickened portion, so that stress concentration portion It is possible to exert a good reinforcing effect.

In the thickening process, the thick portion 1a
The slopes of the sloped portions 11a ₁ and 11a ₂ formed at the ends of are not limited to linear slopes, and may be convex or concave. Therefore, the thickness increasing rate T may be changed from that of the curve 22 in FIG. 4 to 22a, 22b at the beginning region or the end of the thickness increasing process. Further, in order to change the thickness increase rate, in addition to the method of changing only the compression speed V as shown in FIG. 4, only the moving speed W of the heating unit 2 may be changed as shown in FIG. Further, as shown in FIG. 6, both may be changed together to change the desired thickness increase rate. FIG.
In the above, the heating device 9 is arranged on the outer surface side of the steel pipe 1 to perform heating and cooling from the outer surface side. However, this heating and cooling may be performed from the inner surface side of the steel pipe 1, and the heating and cooling may be performed internally. It may be divided into outer surfaces.

FIG. 8 shows an example of a steel pipe having a locally thick portion obtained by the above-mentioned thickening process. Illustrated steel pipe column 11
Is a structure in which a square steel pipe is subjected to the above-mentioned thickening processing and can be used as a through column of a building. The steel pipe 11 has thick portions 11a formed at the intermediate position and both ends thereof in the longitudinal direction. The above-described sloped portions 11a ₁ and 11a ₂ are formed at both ends of the thick portion 11a at the intermediate position, and at the thick portions 11a at both ends of the steel pipe, a steady thick region where the thickness increase rate is constant from the steel pipe ends. The shape is such that 11a ₀ starts. Such thick portions at both ends of the steel pipe can be formed as follows by using the processing apparatus shown in FIG. That is,
When forming a thick portion at the left end of the steel pipe, in FIG. 3, the thickening process is started from the end of the steel pipe on the stopper 3 side, a steady thick region 1a ₀ is formed from the beginning of the thickening, and the thickening end portion is sloped. The effective amount of heat supplied to the heating unit 2 and the relative moving speed S of the heating unit 2 are set so as to be the portion 1a ₂ . Also,
In the case of forming a thick portion at the right end of the steel pipe, in FIG. 3, the thickening process is started slightly before the clamp 5, and the region at the beginning of the thickening becomes the sloped portion 1a ₁ and then the steady thick wall is formed until the end of the steel pipe. The effective amount of heat supplied to the heating unit 2 and the relative moving speed S of the heating unit 2 are set so that the region 1a ₀ continues. Apart from the above-mentioned method, in the vicinity of both ends of the steel pipe 1, a thick wall portion 1a having sloped portions 1a ₁ and 1a ₂ at both ends.
Of the thick-walled portion 1a after forming the
Alternatively, the thick portion 11a may be formed at both ends of the steel pipe by cutting the middle of the steady thick region 1a ₀ and cutting off both ends of the steel pipe.

FIG. 9 is a schematic side view showing a state in which a steel pipe column 11A in which the steel pipe 11 is connected by the thickened steel pipe joint of FIG. 1 is used as a through column extending over a plurality of floors of a building. The thick-walled portion 11a at the upper end of the steel pipe column 11A and the thick-walled portion 11a other than the joint portion at the intermediate position are formed at positions corresponding to the mounting positions of the beams 16 on each floor, and the beams 16 made of H-section steel or the like are joined together. Used to The thick portion 11a at the lower end of the steel pipe column 11A is fixed to the foundation 23 by a fixture 24. In this way, the steel pipe pillar 11A can be used as a through pillar extending over a plurality of floors, and at the same time, in the beam joining work,
Since fixing work to the foundation 23 can be easily performed,
This has the effect of reducing man-hours.

FIGS. 10 and 11 show a mounting structure of the beam 16 on the steel pipe column 11A. Square steel tube column 11
With respect to the thick portion 11a of A, the end portion of the beam 16 made of H-shaped steel is connected to the one side bolt 1 via the split tee 17.
3 is bolted. The thick portion 11a is formed by the beam 16
Further, it is formed in a height range that extends slightly above and below the height range in which the split tee 17 is provided, and a bolt insertion hole 18 is formed. The beam 16 has the horizontal flange portion 17a of the split tee 17 joined to the upper and lower flanges 16a thereof by a high-strength bolt 19 and a nut. Further, the standing piece portion 17b of the split tee 17 is joined to the bolt insertion hole 18 formed in the thick portion 11a of the steel pipe column 11A with the one side bolt 13.

According to this structure, the beam 16 of the steel pipe column 11A is provided.
Since the portion to be joined with is a thick portion 11a and has sufficient strength, it is possible to form the bolt insertion hole 18 in this portion and fix the split tee 17 with the one side bolt 13. .

FIG. 12 shows an example of the one-side bolt 13 used for steel pipe joints and beam joints in the construction structure. The one-side bolt 13 has a pin 37 and a valve sleeve 38, a grip sleeve 39, a shear washer 40, a receiving washer 41, and a nut 42 which are arranged on the outer periphery of the pin 37 in order from the pin head 37a side. And The pin 37 has a threaded portion 37 following the round shaft portion 37e.
A break groove 37d is provided in the middle of b, and a pin head portion 37a having a diameter slightly larger than the pin diameter is provided at the tip. Also, the screw part 3
A short pin tail 37c is provided following 7b. The pin tail 37c has an outer diameter surface formed as an uneven surface for preventing slippage, and is, for example, an uneven surface formed by forming a large number of rows of teeth arranged in the axial direction in the circumferential direction. The valve sleeve 38 is made of a material softer than the grip sleeve 39, and is plastically deformable outward in the form of a brim by the load of the axial force. For example, the grip sleeve 39 is a hard steel alloy and the valve sleeve 38 is a soft steel alloy. Receiving washer 41
Is formed in an inner diameter that allows the grip sleeve 39 to enter,
Moreover, an annular groove 41a into which the outer peripheral portion of the shear washer 40 is fitted is provided on the side surface on the pin head side. The share washer 40 has an inner peripheral portion that engages with the end surface of the grip sleeve 39 and shears with a predetermined axial force. Further, in this example, the round shaft portion 3 of the pin 37 is
The distal end side portion 37e ₁ of 7e is slightly larger in diameter than the proximal end side portion 37e ₂ via the step portion 37f, and the inner diameter of the grip sleeve 39 is smaller than the distal end side portion 37e ₁ . The round shaft portion 37e may have the same diameter over the entire length.

The fastening operation of the one side bolt 13 is as follows.
It can be performed using a rotary electric tightening tool (not shown). That is, while the pin tail 37c is gripped by the tightening tool, the nut 42 is tightened by the box-shaped nut engaging portion of the tool. As a result, a compressive force is applied between the pin head portion 37a and the shear washer 40 to sandwich the grip sleeve 39 and the valve sleeve 38, and the valve sleeve 38 at the tip starts plastically deforming outward in a brim shape. That is, barbing occurs. Round shaft part 3 of pin 37
When 7e is stepped, the above-mentioned barbing occurs until the grip sleeve 39 engages with the step portion 37f. When the nut 42 is further tightened, the shear washer 40 is sheared and the grip sleeve 39 is moved to the shear washer 40.
Enter inside. As a result, when the flange-shaped deformed portion 38a of the valve sleeve 38 engages with the inner surface of the pipe wall of the steel pipe column 11A,
Between the nut 42 and the collar-shaped deformed portion 38a, the steel pipe column 11
A pipe wall and connecting member 12 (or split tee 1
A tightening axial force is introduced in 7). When the nut 42 is further tightened and rotated, the pin tail 37c breaks in the break groove 37d with a predetermined axial force introduced (FIG. 12).
(B)). In the figure, 27 is a bolt insertion hole provided in the standing piece 17b of the split tee 17.

When this one side bolt 13 is used, strong joining can be performed as follows. That is, due to the shearing of the shear washer 40, the nut 42 and the valve sleeve 3
The tightening force between the flange-shaped deformed portion 38a of 8 and the brim-shaped deformed portion 38a directly becomes a tightening force that sandwiches the steel pipe column 11A and the connecting member 12 (or the split tee 17), and a strong tightening force is obtained. Further, in the case of the one side bolt 13, the following advantages can be obtained. First, since the flange-shaped deformed portion 38a of the valve sleeve 38, which serves as the head of the bolt, greatly expands, the contact pressure with the steel pipe column 11A decreases, and the bolt hole diameter has a relatively allowable width. For example, the problem that the edge of the bolt insertion hole 18 is deformed by the contact pressure and the bolt head is fitted is unlikely to occur. Along with that, the load bearing capacity of the bolt head formed of the collar-shaped deformed portion 38a is improved, the tightening force of the one-side bolt 36 is improved, and the efficiency is improved. Moreover,
Since the nut 42 is rotated and tightened, it can be tightened twice or retightened. In addition, an electric device is used for tightening, and it is easy to handle at the site. One side bolt 1 to be tightened by a pulling operation described later with reference to FIG.
In 3A, for example, about 20 kilograms of hydraulic tightening tool is required to obtain sufficient axial force required for rigid connection of buildings, but with the rotary electric device, about 10 kilograms is needed. Light weight is enough. Moreover, heavy hydraulic piping is not required, and only an electric cord is needed, which dramatically improves workability. In addition, the hydraulic unit does not need to be prepared, and tightening on high floors can be performed easily. In addition, the one-side bolt 36 has a short pin tail 37c to be discarded after tightening, and thus waste of material is small. further,
The number of parts that make up the bolt is small, and the cost is reduced.

In the one-side bolt 13 of FIG. 12, instead of the shear washer 40 and the receiving washer 41, the shear washer 40 and the receiving washer 41 are integrated with each other. May be used. That is, the collar-equipped shear washer 40A is formed to have an inner diameter that allows the grip sleeve 39 to enter, and has an inner diameter surface having a collar portion 40Aa that engages with the end surface of the grip sleeve 39 and shears with a predetermined axial force. To do. Also in the case of the one side bolt 13 of this configuration, the tightening can be performed as in the example of FIG.

FIG. 14 shows an example of another one side bolt 13A. This one side bolt 13A is a pin 43,
A first sleeve 44, a second sleeve 45, a grip adjuster 46, a washer 47, and a collar 48, which are arranged in order from the pin head 43a side, are provided on the outer periphery of the pin 43. The pin 43 has a thread groove-shaped uneven peripheral surface portion 43c and a break groove 43b in the middle thereof, and has an uneven peripheral surface portion 43.
A pin head 43a having a diameter slightly larger than the pin diameter is provided at the tip on the c side. Further, the other end of the pin 43 has a fastening tool 4 which will be described later.
It is the pin tail 43d of the uneven peripheral surface which is gripped by the chuck 49b of No. 9. The uneven peripheral surface is composed of a large number of annular grooves arranged side by side. The outer diameter surface of one end of the second sleeve 45 is
It is formed into a tapered taper surface that enters the first sleeve 44 and spreads the first sleeve 44. The grip adjuster 46 is a large-diameter cylindrical portion 46 having a diameter that allows the inner and outer sides to be fitted to each other.
It is assumed that a and the small-diameter cylindrical portion 46b are continuous at the step portion 46c, and the step portion 46c is sheared by a predetermined axial load. The collar 48 is formed in the shape of a short cylinder and has a pin tail 4
It is assumed that the tapered cylindrical portion 48b is opened on the 3d side, and the inner diameter surface is plastically deformed into the concave and convex peripheral surface portion 43c of the pin 43 by the reduction of the outer diameter.

The one-side bolt 13A is fastened by using a fastening tool 49 as shown in FIG. 14 (A).
The fastening tool 49 is a collar 48 of the one side bolt 36A.
Also has a tubular diaphragm guide portion 49a that engages with the end surface and a chuck 49b that holds the pin tail 43d, and has a built-in hydraulic actuator (not shown) that pulls the chuck 49b axially with respect to the diaphragm guide portion 49a. are doing. With the diaphragm guide portion 49a in contact with the collar 48, the chuck 4
By pulling the pin tail 43d with 9b, the collar 48
A compressive force that clamps the washer 47, the grip adjuster 46, the second sleeve 45, and the first sleeve 44 acts between the pin head 43a and the pin head 43a. With this compressive force, first the second
The tapered surface portion of the sleeve 45 enters into the first sleeve 44 and pushes the first sleeve 44 apart. First sleeve 44
When the deformation of the
The small-diameter cylindrical portion 46b is sheared at 6c and enters the large-diameter cylindrical portion 46a. As a result, the first sleeve 44 is attached to the steel pipe column 1
When engaged with 1A, the drawing guide portion 49a of the tool 49 starts drawing the collar 48, and introduction of axial force to the pipe wall of the steel pipe column 11A, which is a non-tightened body, and the split tee 13 is started. By further pulling the chuck 49b,
The squeezing of the collar 48 is completed, the inner diameter surface of the collar 48 is fixed in a state of biting into the uneven peripheral surface portion 43c of the pin 43, and an axial force is introduced by a predetermined force so that the pin tail 43d is broken into a groove 4.
It fractures from 3b (FIG. 14 (B)). In this way,
Between the first sleeve 44 and the collar 48 in the expanded state, the steel pipe column 11A and the connecting member 14 (or the split tee 1).
7) is clamped. One side bolt 13A
Even if they are fastened as described above, they can be joined firmly. That is, this one side bolt 13A
When the grip adjuster 46 is sheared, the tightening force between the first sleeve 44 and the collar 48 directly becomes the tightening force that sandwiches the steel pipe column 11A and the connecting member 14 (or the split tee 17), and thus is strong. A tightening force can be obtained.

Each of the one-side bolts shown in FIGS. 12 to 14 has a pin (37, 43) and a pin (3).
7, 43) and a head forming member (38, 44) which is provided at the tip end of the pin (37, 4) and is plastically deformable in a diameter-expanded state.
3) is externally fitted to the head forming member (3) so as to be axially movable.
And a sleeve (39, 45) for transmitting a pressing force for axially pressing and plastically deforming the sleeve (3, 45), and the sleeve (3
9, 45) and a shearing member (40, 40A, 46) that engages with the rear end of the pin (37, 40) to shear with a predetermined axial force.
43) a head forming member (3) which is provided at the rear of the head and is in an expanded state.
Nuts (4)
2, 48), and a strong tightening force can be obtained by this configuration.

FIG. 15 shows another embodiment of the present invention.
This thickening reinforced pipe joint is composed of a connecting member 12 made of an angle member.
A is arranged at each corner of the surface of the thick portions 11a, 11a of the rectangular steel pipes 11, 11 and the connecting member 12A is fastened to the thick portions 11a, 11a by the one side bolt 13. The other structure is the same as that of the previous embodiment.
In the example of FIG. 15, as shown in FIG. 18, the connecting material 12 may be provided on the inner surface of the steel pipe 11. As the connecting member 12, a flat iron plate or the like is used as in the example of FIG. 16, and the upper and lower steel pipes 11 are stacked.

Although each of the above-described embodiments shows the case where the rectangular steel pipes 11 are connected, the present invention can be applied to a joint for round steel pipes. Further, in place of the one side bolt 13, a normal bolt / nut or a high strength bolt may be used. When a high-strength bolt is used, for example, as shown in FIG. 20, a screw hole 15A is formed in the thick portion 11a of the steel pipe 11 instead of the bolt insertion hole, and the high-strength bolt 60 is screwed into the screw hole 15A. May be. In addition, as shown in FIG. 17A, the connecting material 12 is joined to the steel pipe 11 on one side (lower side in this example) by the high-strength bolt 60 and the nut 61, and the steel pipe 11 on the other side is joined by one You may join with the side bolt 13. Since the operator's hand enters the steel pipe 11 for the steel pipe 11 to which the connecting member 12 is attached first, the high-strength bolt 60 can be used in this way, and thus the expensive one-side bolt 13 can be used. It is possible to reduce the number of used. Further, as shown in FIG. 17 (B), the upper and lower steel pipes 11, 1
In No. 1, the thickening portions 11a may have different thickening ratios. For example, the steel pipe 11 on the upper floor side has a small thickness increase ratio. In that case, if the thick-walled portion 11a bulges outward, a gap is created between the thick-walled portion 11a and the connecting material 12 due to the different thickness of the thick-walled portion 11a. It can be filled by interposing a liner 63 such as an iron plate. In this way, the steel pipe 1 on the upper floor
By using a material having a small wall-thickness increase factor for 1, the thickness can be made according to the required load of each part, and the amount of material used for the steel pipe 11 can be reduced.

[0028]

As described above, the thickened reinforcing pipe joint, the steel pipe column, and the method for manufacturing the same according to the present invention, the opposing end portions of a pair of steel pipes arranged in a substantially butted state are integrally formed by heating and compressing the wall thicknesses of the pipe walls. And a connecting member that overlaps between the thick portions of both steel pipes is provided, and the connecting member and the square thick portion are inserted between the holes formed in the connecting member and the thick portion. Since it was fastened with the bolts, it can be easily joined without welding, and even if the joining bolt holes are opened in the steel pipe,
The cross-section defect can be compensated by increasing the thickness of the thick portion, and it is possible to obtain the cross-sectional performance equal to or higher than that of the base material portion having no bolt hole, and firm joining can be performed. Moreover, since the thick portion is formed by heating and compression, an inexpensive joint structure can be obtained. Further, when the one-side bolt is used, it is possible to join a steel pipe having a closed cross section with a simple structure without providing a nut inside or thread groove processing. One-side bolts have been developed that can be firmly tightened, and it is possible to obtain the same strength as welding by selecting an appropriate one-side bolt. In particular, when it is used as a joint for a steel pipe column, it is a field work at a high place, so by combining the thick part and the one side bolt as described above, it is possible to perform a firm joint with a simple work. Is big. Further, according to the method of the present invention, since the thick portion is formed by induction heating and compression, the thick portion can be formed easily and inexpensively as compared with a forming method such as centrifugal casting. Since the steel pipes are joined to each other by the connecting material in the thick part formed in this way, even when making steel pipe columns, it is possible to easily perform from the forming of the thick part as pre-processing to the joining work on site. Inexpensive and strong joining can be performed.

[Brief description of drawings]

FIG. 1A is a horizontal sectional view showing an embodiment of a steel pipe column using a thickened steel pipe joint of the present invention, FIG. 1B is a front view of the steel pipe column, and FIG. FIG.

FIG. 2 is a process drawing showing the method of manufacturing the same wall-thickened reinforced steel pipe joint.

FIG. 3 is a cross-sectional view of a processing apparatus used in the same process.

FIG. 4 is an explanatory view showing a thickness increasing process by the processing device.

FIG. 5 is a change characteristic graph of another compression speed V, a heating part moving speed W, and a ratio V / W between them in the same thickness increasing process.

FIG. 6 is a change characteristic graph of yet another compression speed V, a heating part moving speed W, and a ratio V / W between them in the thickening process.

FIG. 7 is a partially enlarged cross-sectional view of a steel pipe whose thickness is increased by a processing device.

FIG. 8 is a partially cutaway plan view of the steel pipe.

FIG. 9 is a side view showing a state where the steel pipe column of the embodiment is used as a through column.

FIG. 10 is a perspective view showing a joint structure of a beam to the steel pipe column.

FIG. 11 is a sectional view of the steel pipe column.

FIG. 12 is a cross-sectional view showing a usage example of the one-side bolt used in the embodiment.

FIG. 13 is a cross-sectional view showing another usage example of one side bolt.

FIG. 14 is a cross-sectional view showing a usage example of still another one-side bolt.

FIG. 15 (A) is a horizontal sectional view showing another embodiment of a steel pipe column using the thickened reinforcing pipe joint of the present invention, and FIG. 15 (B) is a front view of the steel pipe column.

FIG. 16 (A) is a horizontal sectional view showing still another embodiment of the steel pipe column using the thickened reinforcing pipe joint of the present invention, and FIG. 16 (B) is a partially cutaway front view of the steel pipe column.

17 (A) and 17 (B) are partially cutaway front views showing still another embodiment of the steel pipe column using the thickened reinforcing pipe joint of the present invention.

FIG. 18 is a horizontal sectional view showing still another embodiment of a steel pipe column using the thickened reinforcing pipe joint of the present invention.

19 (A) and 19 (B) are partially cutaway front views showing still another embodiment of the steel pipe column using the thickened reinforcing pipe joint of the present invention.

FIG. 20 is a partially cutaway front view showing still another embodiment of a steel pipe column using the thickened reinforcing pipe joint of the present invention.

FIG. 21 is a vertical sectional view showing a main part of a conventional example.

[Explanation of symbols]

11 ... steel pipe, 11a ... thick part, 12,12A ... connecting material,
13, 13A ... One side bolt, 14, 15 ... Bolt insertion hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Susumu 1-13-10 Tsukiji, Chuo-ku, Tokyo Daiichi High Frequency Industry Co., Ltd. (72) Inventor Yasuo Watanabe 2 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Chome 17-8 Daiichi Kogyo Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A pair of steel pipes, which are arranged in a substantially butted state to each other, have opposed ends which are thickened portions each having a thickened wall by heating and compression, and are overlapped over the thickened portions of both steel pipes. A material is provided, and the connecting material and the thick portion are
A thickened reinforced steel pipe joint fastened with a bolt inserted between the holes formed in the connecting member and the thick portion. 2. The thickened steel pipe joint according to claim 1, wherein the bolt is a one-sided bolt. 3. A bolt used to fasten one of the pair of steel pipes to the connecting member is a high-strength bolt, and a bolt used to fasten the other steel pipe to the connecting member is a one-side bolt. The thickened steel pipe joint according to claim 1. 4. The thickening ratio of the thick portion to the non-thick portion is different between the thick portions at the opposite ends of the pair of steel pipes. Thickened reinforced steel pipe fittings. 5. Claim 2 or claim 3 or claim 4.
A steel pipe column having the described thickened steel pipe joint. 6. A process of induction heating an end portion of a steel pipe and compressing the heated portion in a longitudinal direction to form a locally thick portion at the end portion of the steel pipe, and the thick portion thus formed. A process of arranging the thick-walled end portions of the pair of steel pipes in a substantially butting state with each other, a process of adding a connecting material that overlaps between the thick-walled portions of both steel pipes, and the connecting material and the thick-walled portion. And a method of fastening with a bolt inserted between holes formed in the thick portion, and a method for manufacturing a thickened steel pipe joint.