JP6703307B2 - Steel pipe joining method and joining structure - Google Patents

Description

The present invention relates to a joining method and a joining structure for steel pipes, and more particularly to a joining method and a joining structure for joining steel pipes used as piles or columns of steel structures so as to be vertically continuous.

Steel pipes are used as pile foundations and column structures for supporting the upper structure of steel structures such as temporary piers.
When a long steel pipe is required as a pile or a pillar, it is necessary to join a plurality of short steel pipes into a long steel pipe at a site where a single long steel pipe cannot be constructed, such as in a narrow space. In this case, for joining steel pipes, mechanical joining with a short construction time is used, and in particular, a structure using another steel pipe (socket (joint steel pipe)) having a diameter larger or smaller than the steel pipe to be joined, that is, a socket-type joining The structure is utilized (refer patent documents 1-5).

The joint structure of the pile of Patent Document 1 is a structure in which a joint steel pipe having an inner diameter substantially the same as the outer diameter of the pile is joined, and a joint steel pipe is covered between the end portions of the piles whose end faces are abutted to each other. This structure is supported by a stopper provided on the lower pile.

In the pile joint structure of Patent Document 2, the upper end of the lower pile structure and the lower end of the upper pile structure are arranged in a state of being abutted against each other, and the upper end and the lower end are both joined so as to surround them from the outside. It is a structure in which a steel pipe is provided, and tightening rings for externally tightening the joined steel pipe to the upper end and the lower end are arranged on the upper and lower portions of the joined steel pipe.

In the joint structure of the steel pipes of Patent Document 3, an inner steel pipe having a liquid-tightly divided mortar injection portion is provided inside the end of the upper column, and the inner ends of other lower columns have a larger inner diameter than the inner steel pipe. Equipped with outer steel pipe. Then, in a state where the inner steel pipe is coaxially inserted into the outer steel pipe, the inner steel pipe is expanded by injecting mortar having expandability into the mortar injecting portion, the inner steel pipe and the outer steel pipe are frictionally joined, and the upper column and Join the lower pillar.

In the joining structure of the steel pipes of Patent Document 4, a joining steel pipe having a diameter smaller than the steel pipe diameter of the joining target steel pipe is inscribed in a connecting portion of one of the joining target steel pipes, and a part thereof is projected from the end face of the steel pipe. The steel pipes are joined together by fixing the projecting end of the joined steel pipe and the other steel pipe. The joining steel pipe and the other steel pipe are fixed to each other through bolts inserted into holes provided in the joining steel pipe and the other steel pipe in advance.

The joining structure of the steel pipes of Patent Document 5 is a structure in which two steel pipes are joined at their steel pipe end portions through a hollow joining steel pipe. The two steel pipes and the joined steel pipe are temporarily fixed with a gap by a blind bolt fastening means that is passed through a bolt hole previously provided in one of the steel pipes and the joined steel pipe, and then an acrylic adhesive is filled into the gap. To join the two steel pipes.

JP, 10-273912, A JP 2001-64961 A JP 2012-7651 A JP, 2005-351412, A JP, 11-222853, A

However, in the joint structure disclosed in Patent Documents 1, 2, 4, and 5, it is conceivable that a large elliptical deformation occurs when stress is applied to the pile, and damage or the like occurs. In order to suppress the above-mentioned elliptical deformation, it is necessary to lengthen the joint steel pipe for joining the piles to each other, but with a long joint steel pipe, handling during construction is poor.
Further, in order to suppress the elliptic deformation, a method of injecting mortar into the pile or the like at the time of joining, as in Patent Document 3, is conceivable, but this method requires a lot of labor for joining and becomes expensive.

The present invention has been made in view of the above points, and an object thereof is to provide a joining method and a joining structure in which deformation does not occur at a joining portion and steel pipes as piles or columns can be easily joined. And

In order to achieve the above object, the present invention is a joining structure for joining steel pipes in a vertical direction through a joining steel pipe having an outer diameter smaller than the inner diameter of the steel pipe, wherein the joining steel pipe is at least long. The interior has a reinforcing portion that extends in a direction orthogonal to the axis to reinforce the joined steel pipe, and the joint structure has the joined steel pipe located in at least one of the steel pipes when the steel pipes are joined together. As described above, a positioning portion for positioning the joined steel pipe is provided , and the positioning portion is a portion that projects outward in the joined steel pipe, and divides the joined steel pipe in the vertical direction, or a long axis of the joined steel pipe. formed by members extending a member that covers the direction of the end in the orthogonal direction to the long axis is characterized in Rukoto.

The reinforcing portion has, for example, a cross shape, a linear shape, or a circular shape in a plan view.

The positioning portion may include a cover steel pipe that covers an outer peripheral surface of one of the steel pipes.

The positioning portion of the joined steel pipe and any one of the steel pipes may be welded in advance before joining.

The joint structure may include a slip-out prevention mechanism that prevents one steel pipe from slipping out of the joint steel pipe.

The present invention according to another aspect is a joining structure for joining steel pipes in a vertical direction through a joining steel pipe having an outer diameter smaller than the inner diameter of the steel pipe, wherein the joining steel pipe is at least in a direction orthogonal to the major axis. Has a reinforcing portion inside to extend to reinforce the joined steel pipe, the joint structure, when the steel pipes are joined, the joined steel pipe is located in at least one of the steel pipes, A positioning part for positioning the joined steel pipe is provided, and the positioning part has a cover steel pipe provided on an outer surface of the joined steel pipe and covering an outer peripheral surface of one of the steel pipes.
In the joint structure according to this aspect, the reinforcing portion has, for example, a cross shape, a linear shape, or a circular shape in a plan view. Further, the joint structure according to the present aspect may include a slip-out prevention mechanism that prevents one steel pipe from slipping out of the joint steel pipe.
The present invention according to still another aspect is a joining method for joining steel pipes in a vertical direction through a joined steel pipe having an outer diameter smaller than the inner diameter of the steel pipe, wherein the joined steel pipe is in a direction orthogonal to its long axis. It has a reinforcing portion inside which extends and reinforces the joined steel pipe, and when the steel pipes are joined, the joined steel pipe is located in at least one of the steel pipes, so that the reinforced portion is in the horizontal direction. look including the step of installing and positioning by the positioning unit to the joining steel pipe extending form, wherein the positioning portion is provided on the outside of the inner surface or the bonding steel pipe of one of the steel pipe, installing the bonding steel pipe In the step of, after installing the one steel pipe so that its long axis extends in the vertical direction, the step of installing the joined steel pipe at a position where the positioning portion and the joined steel pipe or the one steel pipe come into contact with each other. The joining method, in order to adjust the height of the steel pipe after joining, after installing the one steel pipe, before installing the other steel pipe, a step of cutting the one or the other steel pipe, It is characterized in including Mukoto.

The present invention according to still another aspect is a joining method for joining steel pipes in a vertical direction through a joined steel pipe having an outer diameter smaller than the inner diameter of the steel pipe, wherein the joined steel pipe is in a direction orthogonal to its long axis. It has a reinforcing portion inside which extends and reinforces the joined steel pipe, and when the steel pipes are joined, the joined steel pipe is located in at least one of the steel pipes, so that the reinforced portion is in the horizontal direction. Including the step of positioning and installing the joined steel pipe by a positioning portion in the extending form, the positioning portion is provided on the outer surface of the joined steel pipe, the step of installing the joined steel pipe, Before installation, it is a step of pre-welding the joined steel pipe and the one steel pipe, the joining method, in order to adjust the height of the steel pipe after joining, cutting the other steel pipe , It has a feature .
In the joining method according to the present aspect, the positioning portion divides the joined steel pipe in a long axis direction, or is a member that covers one end in the long axis direction of the joined steel pipe and extends in a direction perpendicular to the long axis. You may form by.

According to the joining method and joining structure of the present invention, elliptical deformation does not occur at the joining portion, and steel pipes as piles or columns can be easily joined together.

It is a figure which shows an example of the structure in which the joining structure which concerns on embodiment of this invention is used. It is a figure for demonstrating the joining structure which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the joining structure which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the effect of the joining structure of FIG. It is a figure for demonstrating the effect of the joining structure of FIG. It is a figure explaining the joining method of the steel pipe at the time of using the joining structure of FIG. It is a figure explaining the joining method of the steel pipe at the time of using the joining structure of FIG. It is sectional drawing for demonstrating the joining structure which concerns on the 2nd Embodiment of this invention. It is sectional drawing for demonstrating the joining structure which concerns on the 3rd Embodiment of this invention. It is sectional drawing for demonstrating the joining structure which concerns on the 4th Embodiment of this invention. It is sectional drawing for demonstrating the joining structure which concerns on the 5th Embodiment of this invention. It is sectional drawing for demonstrating the joining structure which concerns on the 6th Embodiment of this invention. It is a figure which shows the other example of the reinforcement part of a joined steel pipe. It is a figure which shows the other example of the reinforcement part of a joined steel pipe. It is a figure which shows the other example of the reinforcement part of a joined steel pipe. It is sectional drawing for demonstrating the joining structure which concerns on the 7th Embodiment of this invention. It is a figure which shows the other example of a slip-out prevention mechanism.

Embodiments of the present invention will be described below with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.

The joining structure according to the embodiment of the present invention is a structure in which joined steel pipes are joined so as to be continuous in the vertical direction. In the following, an example in which the steel pipe to be joined and the joined steel pipe are circular steel pipes will be described, but they may be rectangular steel pipes. The circular steel pipe and the square steel pipe are steel pipes having circular and rectangular cross sections, respectively.

FIG. 1 is a diagram showing an example of a structure in which a joining structure according to an embodiment of the present invention is used.
The temporary pier structure 1 shown in the figure is constructed temporarily for the purpose of approaching a working machine when constructing a structure to a river, the sea, transporting materials, and the like, and includes a steel pipe pile 2 and a steel pipe column. 3, a beam 4, a brace 5, and a floor plate 6.

The steel pipe pile 2 is a pile partially buried in the ground by driving or the like, has a long axis extending in the vertical direction, and is made of a circular steel pipe.
The steel pipe pillar 3 is joined to the steel pipe pile 2 to form a pillar of the temporary pier structure 1, and like the steel pipe pile 2, has a long axis extending in the vertical direction and is made of a circular steel pipe. ..
The beam 4 connects the adjacent steel pipe columns 3 to each other, and is made of, for example, H-section steel.
The brace 5 is for maintaining the strength of the temporary pier structure 1, and is bridged between the beams 4.
The floor plate 6 is one on which a working machine and materials are placed, and is made of, for example, a lining plate made of H-shaped steel, and is attached to the upper end of the steel pipe column 3 in a state of straddling a plurality of steel pipe columns 3. Mounted.

Among the circular steel pipes used for the above-mentioned temporary pier structure 1, for example, the joining structure according to the present embodiment is used for joining the circular steel pipes forming the steel pipe pile 2 and the circular steel pipes forming the steel pipe column 3.

2 and 3 are views for explaining the joining structure according to the first embodiment of the present invention. FIG. 2(A) is an exploded perspective view and FIG. 2(B) is a bottom view of the joining structure. 3A to 3C are a cross-sectional view, a top view and a perspective view of the joining structure according to the present embodiment, respectively. In addition, below, the steel pipe pile 2 side is demonstrated as a lower side, and the steel pipe pillar 3 side is an upper side.

As shown in FIG. 2(A), the joint structure 10 according to the present embodiment includes a lower circular steel pipe 20 that constitutes the steel pipe pile 2, an upper circular steel pipe 30 that constitutes the steel pipe column 3, and these circular steel pipes 20, The joining steel pipe 40 for joining 30 so that it may continue in a perpendicular direction is provided.

The joined steel pipe 40 is used in such a form that it is inserted into the lower circular steel pipe 20 and the upper circular steel pipe 30 so as to straddle the lower circular steel pipe 20 and the upper circular steel pipe 30, and for example, the inner diameter of the lower circular steel pipe 20 and the upper circular steel pipe 30. It has a smaller but substantially the same outer diameter.
The joined steel pipe 40 has a reinforcing portion 41 inside which extends in the horizontal direction and reinforces the inside. The reinforcing portion 41 is formed of, for example, a steel plate. The reinforcing portion 41 of the present example extends not only in the horizontal direction but also in the vertical direction as shown in FIG. 2B, and is formed over the entire length of the joined steel pipe 40 in the vertical direction. .. The reinforcing portion 41 is formed in a cross shape in a top view.

When attaching the joined steel pipe 40, the joined steel pipe 40 is inserted into the lower circular steel pipe 20.
The lower circular steel pipe 20 has a positioning portion 21 for vertically positioning the joined steel pipe 40 with respect to the lower circular steel pipe 20. The distance from the upper end surface of the positioning portion 21 to the upper end surface of the lower circular steel pipe 20 is smaller than the length of the joined steel pipe 40 in the vertical direction. Therefore, as shown in FIGS. 3A to 3C, when the upper circular steel pipe 30 is installed on the lower circular steel pipe 20 and the joining of the steel pipes 20 and 30 is completed, the joined steel pipe 40 is positioned by the positioning portion 21. With the positioning of, the upper circular steel pipe 20 and the lower circular steel pipe 30 can be positioned inside the upper end portion and the lower end portion of the upper circular steel pipe 30, respectively.

The horizontal positioning of the joined steel pipe 40 with respect to the lower circular steel pipe 20 is performed by the outer peripheral surface of the joined steel pipe 40 and the inner peripheral surface of the lower circular steel pipe 20. Further, the horizontal positioning of the upper circular steel pipe 30 with respect to the bonded steel pipe 40 positioned with respect to the lower circular steel pipe 20 in the horizontal direction as described above is performed by determining the outer peripheral surface of the bonded steel pipe 40 and the inner peripheral surface of the upper circular steel pipe 30. And by. As described above, the horizontal positioning of the upper circular steel pipe 30 with respect to the lower circular steel pipe 20 is performed via the joined steel pipe 40. The vertical positioning of the upper circular steel pipe with respect to the lower circular steel pipe 20 is performed by bringing the lower end of the upper circular steel pipe 30 into contact with the upper end of the lower circular steel pipe 20.

4 and 5 are views for explaining the effect of the junction structure 10. FIG. 4 is a diagram showing a state of deformation of the upper circular steel pipe and the joined steel pipe of the joint structure when a bending moment acts on the upper circular steel pipe, and FIGS. 4(A) and 4(B) are respectively comparisons described later. 4C and 4D are a top view and a side view, respectively, of the joining structure 10 described above. FIG. 5: is a figure explaining the magnitude|size of the force applied to a joining steel pipe from an upper side circular steel pipe, when a bending moment acts on an upper side circular steel pipe, and FIG. 5(A) is a figure when a joining steel pipe is long. FIG. 5(B) is a diagram when the joined steel pipe is short.

The joint structure 300 of the comparative example of FIGS. 4A and 4B is a structure in which the lower circular steel pipe 20 and the upper circular steel pipe 30 are joined by using the joined steel pipe 301 without the reinforcing portion 41.
In this joint structure 300, when a bending moment acts on the upper circular steel pipe 30 and a force P that causes an elliptical deformation of the upper circular steel pipe 30 and the joined steel pipe 301 acts, the forces P and P′ cannot be resisted, The upper circular steel pipe 30 and the joined steel pipe 301 are elliptically deformed.

On the other hand, in the joint structure 10 of the present embodiment, when the bending moment acts on the upper circular steel pipe 30 and the forces P and P′ that cause the upper circular steel pipe 30 and the joined steel pipe 40 to undergo elliptical deformation act, the joined steel pipe 40 is reinforced. Since the portion 41 is provided, at least the resistance to the force P for causing the elliptical deformation is high not only in the joined steel pipe 40 but also in the upper circular steel pipe 30. Therefore, in the joining structure 10, the upper circular steel pipe 30 and the joining steel pipe 40 do not undergo elliptical deformation.

Further, it is preferable that the joined steel pipe 40 has a shorter length because handling at the time of construction is easier. However, as shown in FIGS. 5(A) and 5(B), when the joined steel pipe 40 is short, when the bending moment M acts on the upper circular steel pipe 30, the moment arm is longer than when the joined steel pipe 40 is long. Becomes shorter, the force P that causes the upper circular steel pipe 30 and the joined steel pipe 40 to undergo elliptical deformation increases. However, since the joined steel pipe 40 has the reinforcing portion 41 (see FIG. 2) as described above, the joined steel pipe 40 and the upper circular steel pipe 30 have high resistance to the force of elliptical deformation. Therefore, in the joint structure 10, the short joint steel pipe 40 can be used.

In addition, in the joint structure 10, mortar hammering or the like for suppressing elliptical deformation is not required, which is simple, and the steel pipes can be joined in a short time.

FIG. 6 and FIG. 7 are diagrams illustrating a method of joining steel pipes when the joining structure 10 is used.
When using the joining structure 10, for example, as shown in FIG. 6(A), first, the lower circular steel pipe 20 forming the steel pipe pile is driven into the ground.
Then, as shown in FIG. 6B, the joined steel pipe 40 is inserted into the lower circular steel pipe 20. The insertion is performed until the lower end of the joined steel pipe 40 contacts the positioning portion 21 (see FIG. 2B) provided on the inner side surface of the lower circular steel pipe 20.

When the lower circular steel pipe 20 cannot be driven to a predetermined height, in other words, when the head height of the lower circular steel pipe 20, that is, the pile head stops high, the upper end of the lower circular steel pipe 20 Or the height of the upper end of the upper circular steel pipe 30 after being joined to the lower circular steel pipe 20 is set as a design value, the above design value in the upper circular steel pipe 30 is set as shown in FIG. 6C. The corresponding cutting location 31 is cut by gas cutting or the like. Instead of cutting the upper circular steel pipe 30, a position above the positioning portion 21 of the lower circular steel pipe 20 may be cut. The cutting of the steel pipe may be performed before inserting the joined steel pipe 40 into the lower circular steel pipe 20.

After cutting the steel pipe, by attaching the upper circular steel pipe 30 to the portion protruding from the lower circular steel pipe 20 of the joined steel pipe 40, as shown in FIG. 6D, the lower circular steel pipe 20 and the upper circular steel pipe. 30 and 30 can be joined so as to be continuous in the vertical direction.

As described above, when the joining structure 10 is used, it is possible to join the steel pipes after adjusting the height of the steel pipes to be connected.

In addition, when the lower circular steel pipe 20 can be driven to a predetermined height when the lower circular steel pipe 20 is driven into the ground, as shown in FIG. 7A, the upper circular steel pipe 30 is not cut. Instead, the upper circular steel pipe 30 is attached to the portion protruding from the lower circular steel pipe 20 of the joined steel pipe 40. Thus, as shown in FIG. 7B, the lower circular steel pipe 20 and the upper circular steel pipe 30 can be joined so as to be continuous in the vertical direction.

FIG. 8 is a cross-sectional view for explaining the joining structure according to the second embodiment of the present invention.

In the joining structure 10 according to the first embodiment shown in FIG. 2 and the like, the lower circular steel pipe 20 is provided with the positioning portion 21 that positions the joining steel pipe 40 in the vertical direction.

On the other hand, in the joint structure 50 according to the second embodiment of FIG. 8, the positioning portion 61 is not provided on the lower circular steel pipe 20 ′, but is provided on the outer peripheral surface of the joint steel pipe 60 having the reinforcing portion 41. There is. The joint steel pipe 60 is positioned and fixed by locking the positioning portion 61 to the upper end of the lower circular steel pipe 20'.

The positioning portion 61 is formed, for example, in the central portion of the joined steel pipe 60 in the vertical direction. Since the compressive force applied to the upper circular steel pipe 30 is transmitted to the lower circular steel pipe 20 ′ via the positioning portion 61, the positioning portion 61 is preferably formed in an annular shape over the entire circumference of the joined steel pipe 60. .. The annular positioning portion 61 can be formed by welding flat steel to a circular steel pipe forming the outer shape of the joined steel pipe 60.

Next, regarding the joining method in the case of using the joining structure 50, portions different from the case of using the joining structure 10 will be described.
When the joining structure 50 is used, when the joining steel pipe 60 is inserted into the lower circular steel pipe 20′, the insertion is performed until the positioning portion 61 of the joining steel pipe 60 contacts the upper end surface of the lower circular steel pipe 20′. ..
Moreover, when it is necessary to adjust the height of the steel pipe when the joining structure 50 is used, the upper circular steel pipe 30 may be cut or the lower circular steel pipe 20 ′ may be cut.

FIG. 9 is a cross-sectional view for explaining the joining structure according to the third embodiment of the present invention.

In the joining structure 50 according to the second embodiment of FIG. 8, the joining steel pipe 60 is formed by welding flat steel forming the positioning portion 61 to the outer periphery of one circular steel pipe having the reinforcing portion 41 inside. ..
On the other hand, in the joint structure 70 according to the third embodiment of FIG. 9, the joint steel pipe 80 includes two circular steel pipes 81 and 82 having the same shape and having the reinforcing portion 41 therein, and the flat steel plate 83. .. The steel plate 83 has, for example, a disc shape, and its diameter is larger than the outer diameters of the circular steel pipes 81 and 82. Therefore, when the joined steel pipe 80 is produced by arranging the circular steel pipe 81, the steel plate 83, and the circular steel pipe 82 coaxially in this order and fixing them by welding or the like, a convex portion protruding in an annular shape in a direction orthogonal to the long axis of the joined steel pipe 80. 84 is formed. In the joined steel pipe 80, the convex portion 84 serves as a positioning portion that positions the joined steel pipe 80 in the vertical direction. In other words, the convex portion (hereinafter, positioning portion) 84 of the joined steel pipe 80 is a member that divides in the long axis direction (vertical direction) of the joined steel pipe 80 and that extends in the direction orthogonal to the long axis (horizontal direction). Is formed of a steel plate 83.
Since the positioning portion 84 of the joined steel pipe 80 is locked to the upper end of the lower circular steel pipe 20′, the joined steel pipe 80 is positioned and fixed with respect to the lower circular steel pipe 20′ in the vertical direction.

The diameter of the steel plate 83 forming the positioning portion 84 is substantially the same as the diameter of the lower circular steel pipe 20 and the upper circular steel pipe 30 in the example of the figure, but it is larger than the diameter of these steel pipes 20, 30. Good. Further, the steel plate 83 does not have to have a disc shape and may have a rectangular plate shape.

Next, with respect to the joining method when the joining structure 70 is used, portions different from the case where the joining structure 10 is used will be described.
When the joint structure 70 is used, when the joint steel pipe 80 is inserted into the lower circular steel pipe 20′, the insertion is performed until the positioning portion 84 of the joint steel pipe 80 contacts the upper end surface of the lower circular steel pipe 20′. ..
Moreover, when it is necessary to adjust the height of the steel pipe when using the joining structure 70, the upper circular steel pipe 30 may be cut or the lower circular steel pipe 20 ′ may be cut.

FIG. 10 is a cross-sectional view for explaining the joining structure according to the fourth embodiment of the present invention.

In the joining structure 70 according to the third embodiment of FIG. 9, the joining steel pipe 80 includes circular steel pipes 81 and 82 having reinforcing portions 41 inside, which are located on both sides of the steel plate 83, so to speak. The circular steel pipe having 41 was divided by the steel plate 83.

On the other hand, in the joint structure 90 according to the fourth embodiment of FIG. 10, the joint steel pipe 100 has one circular steel pipe 101 having the reinforcing portion 41 inside and a steel plate 102 on a flat plate. The lower end of is covered with the steel plate 102. The steel plate 102 is disc-shaped and its diameter is larger than the outer diameter of the circular steel pipe 101. Therefore, when the circular steel pipe 101 and the steel plate 102 are coaxially arranged and fixed to each other by welding or the like, the convex portion 103 protruding in an annular shape in a direction orthogonal to the long axis of the joined steel pipe 100 is formed. In the joined steel pipe 100, the convex portion 103 serves as a positioning portion for positioning the joined steel pipe 100 in the vertical direction with respect to the lower circular steel pipe 20′. In other words, the convex portion (hereinafter, positioning portion) 103 of the joined steel pipe 100 is a member that covers the long axis direction (vertical direction) of the joined steel pipe 100 and extends in the direction orthogonal to the long axis (horizontal direction). It is formed by a certain steel plate 102.

Next, regarding the joining method in the case of using the joining structure 90, portions different from the case of using the joining structure 10 will be described.

When the joining structure 90 is used, before joining the lower circular steel pipe 20 ′ constituting the steel pipe pile into the ground, more specifically, before delivering the lower circular steel pipe 20 ′ to the site as a material, the joining steel pipe The positioning part 103 of 100 and the lower circular steel pipe 20' are welded together, and the joined steel pipe 100 is previously fixed to the lower circular steel pipe 20'. Then, the lower circular steel pipe 20' to which the joined steel pipe 100 is fixed is driven into the ground. The above-mentioned welding of the positioning portion 103 and the lower circular steel pipe 20′ may be performed on site. However, by welding before delivery to the site, work time at the site can be reduced.
Further, when the joining structure 90 is used and the height of the steel pipe needs to be adjusted, the upper circular steel pipe 30 is cut.

When the positioning portion is formed of a flat steel plate as in the present embodiment and the third embodiment, since the flat steel plate extends in the horizontal direction at the time of joining, the same effect as the reinforcing portion can be obtained. Play.

Further, the lower circular steel pipe 20' and the joined steel pipe 80 of the third embodiment may be fixed in advance by welding, as in the present embodiment. In this case, when it is necessary to adjust the height of the steel pipe to be joined at the time of joining the steel pipes, the upper circular steel pipe 30 is cut.

By pre-welding the steel pipe to be joined and the joined steel pipe, the compressive force can be more reliably transmitted between the joined steel pipes.
Further, when the steel pipe to be joined and the joined steel pipe are not welded, the joined steel pipe can be easily reused.

FIG. 11: is sectional drawing for demonstrating the joining structure which concerns on the 5th Embodiment of this invention.

In the joint structure 90 of FIG. 10, since the positioning portion 103 and the lower circular steel pipe 20′ can be welded, the diameter of the steel plate 102 of the joint steel pipe 100 is substantially the same as the outer diameter of the lower circular steel pipe 20′. Was becoming. Further, by performing the above-described welding, the horizontal positioning with respect to the lower circular steel pipe 20' of the joined steel pipe 100 was performed.

On the other hand, in the joined steel pipe 120 of the joined structure 110 according to the fifth embodiment of FIG. 11, the diameter of the disk-shaped steel plate 121 that covers the lower side of the circular steel pipe 101 having the reinforcing portion 41 has a lower circular steel pipe 20. It is formed larger than the outer diameter of ′. A cover steel pipe 122 is coaxially welded to the steel plate 121 on the side opposite to the circular steel pipe 101. The cover steel pipe 122 is a circular steel pipe that covers the outer peripheral surface of the lower circular steel pipe 20 ′, has an outer diameter substantially the same as the outer diameter of the steel plate 121, and has an inner diameter larger than the outer diameter of the lower circular steel pipe 20 ′. Have.
Therefore, in the joint structure 110, vertical positioning with respect to the lower circular steel pipe 20 ′ of the joined steel pipe 120 is performed by the steel plate 121, and horizontal positioning is performed by the cover steel pipe 122.

Next, regarding the joining method in the case of using the joining structure 110, portions different from the case of using the joining structure 10 will be described.

When the joint structure 110 is used, the joint steel pipe 120 is attached to the lower circular steel pipe 20' that is driven into the ground. More specifically, the joined steel pipe 120 is attached to the lower circular steel pipe 20 ′ so that the lower circular steel pipe 20 ′ is inserted into the cover steel pipe 122. Thereby, the steel plate 121 of the joined steel pipe 120 contacts the upper end surface of the lower circular steel pipe 20', and the cover steel pipe 122 covers the outer surface of the lower circular steel pipe 20'.
Moreover, when it is necessary to adjust the height of the steel pipe when using the joining structure 110, the upper circular steel pipe 30 may be cut or the lower circular steel pipe 20 ′ may be cut.

FIG. 12: is sectional drawing for demonstrating the joining structure which concerns on the 6th Embodiment of this invention.

In the joined steel pipe 120 of the joining structure 110 of FIG. 11, a circular steel pipe 101 having a reinforcing portion 41 is provided in a portion on the upper side in the vertical direction with respect to the steel plate 121 during joining, and a steel pipe to be joined is joined to a portion on the lower side thereof. The cover steel pipe 122 having an inner diameter larger than the outer diameter of the above was provided.
In the joined steel pipe 140 of the joining structure 130 of FIG. 12, the circular steel pipe 101 is provided in a portion vertically below the steel plate 121 at the time of joining, and the cover steel pipe 122 is provided in an upper portion thereof.

In the joining structure 130, horizontal positioning of the joining steel pipe 140 with respect to the lower circular steel pipe 20′ is performed by the circular steel pipe 101 and the like, and vertical positioning of the joining steel pipe 140 with respect to the lower circular steel pipe 20′ is performed by the steel plate 121. The horizontal positioning of the upper circular steel pipe 30 with respect to the joined steel pipe 140 is performed by the cover steel pipe 122 and the like.

Next, with respect to the joining method when the joining structure 130 is used, the part different from the case where the joining structure 10 is used will be described.
When the joining structure 130 is used, when the joining steel pipe 140 is inserted into the lower circular steel pipe 20′, the insertion is performed until the steel plate 121 of the joining steel pipe 140 comes into contact with the upper end surface of the lower circular steel pipe 20′.
Moreover, when it is necessary to adjust the height of the steel pipe when the joining structure 50 is used, the upper circular steel pipe 30 may be cut or the lower circular steel pipe 20 ′ may be cut.

13 to 15 are views showing another example of the reinforcing portion of the joined steel pipe, FIG. 13 is a perspective view, FIG. 14(A) and FIG. 15(A) are top views, and FIG. 14(B) and FIG. 15(B) is a sectional view.
The reinforcing portion of the joined steel pipe may be any as long as it extends in the direction perpendicular to the long axis of the joined steel pipe, and is not limited to the cross shape in the top view of the above example. For example, it may be circular in a top view like the reinforcing portion 151 of the joined steel pipe 150 in FIG. Note that the illustration may be a donut shape in a top view, which is omitted.

In addition, if the direction of the joined steel pipe can be determined and installed, and if the direction to be the strong axis of the joined steel pipe is determined, reinforcement of the joined steel pipe 160 of FIGS. 14(A) and 14(B). It may be linear in a top view like the portion 161. The reinforcing portion of this example is composed of one straight line in a top view, but the reinforcing portion may be composed of a plurality of straight lines in a top view.
With the reinforcing portion 41 having a cross shape in a top view or the reinforcing portion 151 having a circular shape in a top view, the joined steel pipe can be installed without determining the orientation of the joined steel pipe.

Further, like the reinforcing portion 171 of the joined steel pipe 170 of FIG. 15(A), it may be formed of a plurality of (two in the example of the figure) substantially semicircular members in a top view. The number of the reinforcing portions 171 may be plural when viewed in the direction perpendicular to the major axis.
The reinforcing portion having a cross shape when viewed from above, a circular shape when viewed from above, a linear shape when viewed from above, and a substantially semicircular shape when viewed from above can be formed of a flat plate-shaped steel plate.

FIG. 16 is a cross-sectional view for explaining the joining structure according to the seventh embodiment of the present invention.
The illustrated joint structure 180 has a slip-out prevention mechanism 190 that prevents the upper circular steel pipe 30 ′ from slipping out of the welded steel pipe 40 (see FIG. 2 ).
The slip-out prevention mechanism 190 has a plurality of tabs 191 formed so as to horizontally project from the lower circular steel pipe 20″ and a plurality of tabs 192 that horizontally project from the upper circular steel pipe 30′.

The number of tabs 191 and the number of tabs 192 are the same (four), and the tabs 191 and 192 are formed at equal intervals along the circumferential direction of the lower circular steel pipe 20″ and the upper circular steel pipe 30′, respectively. 191 is formed near the upper end of the lower circular steel pipe 20 ″, but the tab 192 is formed at a position separated from the lower end of the upper circular steel pipe 30. The portion from the lower end of the upper circular steel pipe 30' to the tab 192 is an extra length portion for adjusting the height of the steel pipe. This extra length can be cut if height adjustment is required. Such an extra length portion may be provided in the lower circular steel pipe.

Holes (not shown) are formed in the tabs 191 and 192. After joining, through the screw holes 193 and the holes of the tab 192, the full screw bolts 193 are inserted, and nuts (not shown) are attached to both ends of the full screw bolts. It is possible to prevent the circular steel pipe 30' from coming out of the joined steel pipe.

FIG. 17 is a diagram showing another example of the slip-out prevention mechanism.
The slip-out prevention mechanism 200 of FIG. 17 prevents the upper circular steel pipe 30 from slipping out of the joined steel pipe 40 (see FIG. 2) and prevents the joined steel pipe 40 from slipping out of the lower circular steel pipe 20.

It is possible to prevent the upper circular steel pipe 30 from coming out of the joined steel pipe 40 by fastening the upper circular steel pipe 30 and the joined steel pipe 40 using a screw 201 that does not require an internal thread.
Further, the joining steel pipe 40 can be prevented from coming out of the lower circular steel pipe 20 by fastening the lower circular steel pipe 20 and the joining steel pipe 40 by using a screw 202 that does not require a female screw.

It should be noted that, for example, a marking indicating the formation position of the reinforcing portion 41 when the joined steel pipe 40 is attached to the lower circular steel pipe 20 is performed so that the portion of the joined steel pipe 40 where the reinforcing portion 41 is formed is not fastened. Preferably.

Further, the fastening of the circular steel pipe for adjusting the length, that is, the circular steel pipe to be cut (for example, the upper circular steel pipe) and the joined steel pipe may be performed as follows.
That is, a hole is formed in the joined steel pipe, and a nut is welded to the exit portion of the hole (inner portion of the joined steel pipe). Then, the outer surface of the lower circular steel pipe is marked so that the position of the hole can be known when the joined steel pipe is attached to the lower circular steel pipe. Then, after the upper circular steel pipe is installed on the lower circular steel pipe, a hole is formed using gas or the like at the position of the upper circular steel pipe corresponding to the hole of the joined steel pipe based on the marking. Then, the bolt can be inserted into the hole of the joined steel pipe through the hole formed in the upper circular steel pipe, and the bolt can be screwed into the nut to fasten the upper circular steel pipe and the joined steel pipe.

The fastening of the uncut circular steel pipe (for example, the lower circular steel pipe) and the joined steel pipe may be performed as follows. Similarly to the above, a hole in which a nut is welded is formed in the joined steel pipe, and a hole is formed in advance at the position of the lower circular steel pipe corresponding to the hole (before carrying in the material). Then, after aligning the lower circular steel pipe and the joined steel pipe so that these holes are aligned, the joined steel pipe is mounted on the lower circular steel pipe. Then, the bolt can be inserted into the hole of the joined steel pipe through the hole of the lower circular steel pipe, and the bolt can be screwed into the nut to fasten the lower circular steel pipe and the joined steel pipe.

The present invention is useful for a structure using a steel pipe.

DESCRIPTION OF SYMBOLS 1... Temporary pier structure 2... Steel pipe pile 3... Steel pipe pillar 4... Beam 5... Brace 10, 50, 70, 90, 110, 130, 180... Joining structure 20, 20', 20"... Lower circular steel pipe 21, 61, 103... Positioning portion 30, 30'... Upper circular steel pipe 40, 60, 80, 100, 120, 140, 150, 160, 170... Joined steel pipe 41, 151, 161, 171... Reinforcing portion 190, 200... Preventing slipping out mechanism

Claims (11)

A joining structure for joining steel pipes in a vertical direction through a joining steel pipe having an outer diameter smaller than the inner diameter of the steel pipe,
The joined steel pipe has at least a reinforcing portion inside which extends at least in a direction orthogonal to the long axis to reinforce the joined steel pipe,
The joint structure is
The joining steel pipe is positioned in at least one of the steel pipes when the steel pipes are joined together , and includes a positioning portion that positions the joining steel pipe ,
The positioning unit,
A portion of the joined steel pipe protruding outward,
Junction structure wherein the bonding steel pipe is divided in the vertical direction, or, characterized by Rukoto formed by members extending in a member that covers the one end of the long axis direction and the long axis direction perpendicular to the joining steel pipe. The joining structure according to claim 1, wherein the reinforcing portion has a cross shape, a linear shape, or a circular shape in a plan view. The joining structure according to claim 1 or 2 , wherein the positioning portion of the joined steel pipe and one of the steel pipes are pre-welded before joining. The joint structure according to claim 1 or 2 , wherein the positioning portion has a cover steel pipe that covers an outer peripheral surface of one of the steel pipes. One of the steel pipe is characterized in that it comprises a prevention mechanism exit to prevent the escape from the joint steel pipe joint structure according to any one of claims 1-4. A joining structure for joining steel pipes in a vertical direction through a joining steel pipe having an outer diameter smaller than the inner diameter of the steel pipe,
The joined steel pipe has at least a reinforcing portion inside which extends at least in a direction orthogonal to the long axis to reinforce the joined steel pipe,
The joint structure is
The joining steel pipe is positioned in at least one of the steel pipes when the steel pipes are joined together, and includes a positioning portion that positions the joining steel pipe,
The positioning unit,
Provided on the outer surface of the joined steel pipe,
A joint structure having a cover steel pipe covering an outer peripheral surface of one of the steel pipes. The joint structure according to claim 6, wherein the reinforcing portion has a cross shape, a linear shape, or a circular shape in a plan view. The joining structure according to claim 6 or 7, further comprising a slip-out preventing mechanism that prevents one of the steel pipes from slipping out of the joined steel pipe. A joining method for joining steel pipes vertically through a joined steel pipe having an outer diameter smaller than the inner diameter of the steel pipe,
The joined steel pipe has a reinforcing portion inside which extends in a direction orthogonal to the long axis to reinforce the joined steel pipe,
A step of positioning and installing the joined steel pipe by the positioning portion in a form in which the reinforcing portion extends in the horizontal direction so that the joined steel pipe is located in at least one of the steel pipes when the steel pipes are joined. only including,
The positioning portion is provided on the inner surface of one of the steel pipes or on the outside of the joined steel pipe,
In the step of installing the joined steel pipe, the one steel pipe is installed so that its long axis extends in the vertical direction, and then the joining is performed at a position where the positioning portion and the joined steel pipe or the one steel pipe are in contact with each other. Is the step of installing the steel pipe,
The joining method, in order to adjust the height of the steel pipe after bonding, after installation of the one of the steel pipe, before installing the other of steel pipe, the one or-law including the step of cutting the other steel pipe and And a joining method. A joining method for joining steel pipes vertically through a joined steel pipe having an outer diameter smaller than the inner diameter of the steel pipe,
The joined steel pipe has a reinforcing portion inside which extends in a direction orthogonal to the long axis to reinforce the joined steel pipe,
A step of positioning and installing the joined steel pipe by the positioning portion in a form in which the reinforcing portion extends in the horizontal direction so that the joined steel pipe is located in at least one of the steel pipes when the steel pipes are joined. Including,
The positioning portion is provided on the outer surface of the joined steel pipe,
The step of installing the joined steel pipe is a step of pre-welding the joined steel pipe and the one steel pipe before installing both steel pipes,
The joining method, in order to adjust the height of the steel pipe after bonding, comprising the step of cutting the other steel pipe bonding method. The positioning unit,
The joining steel pipe is divided in the long axis direction, or is formed by a member that covers one end of the joining steel pipe in the long axis direction and that extends in a direction perpendicular to the long axis. the bonding method according to 1 0.

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