JP2011032680A - Base for erecting steel pipe, and steel pipe erection structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently secure vertical accuracy of a steel pipe and positional accuracy along two horizontal directions and temporarily fix a lower end of the steel pipe to a base with sufficient strength, without deteriorating installation stability of the steel pipe. <P>SOLUTION: This base 3 for erecting the steel pipe, which constitutes a structure 1 for erecting the steel pipe, includes four strut materials 22 in total, which are erected on a placing joint concrete surface 6 in the construction of a caisson type pile 2, and a base body 21 which is laid across the strut materials. The base body 21 is constituted by setting the vicinity of the center of H-shaped steel 27 as a joint area, and welding H-shaped steel 28 and H-shaped steel 29 to lateral sides of the joint area from an orthogonal direction, respectively. One end area 30 of the H-shaped steel 27 except the joint area, the other end area 31 thereof, the H-shaped steel 28, and the H-shaped steel 29 constitute four steel pipe placing portions which are arranged in such a manner that the axes of member are set orthogonal to each other and elongated in a radial direction from the center of the base, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention mainly relates to a steel pipe erection platform applied when a steel pipe constituting a steel pipe / concrete composite structure pier is erected and a steel pipe erection structure using the same.

  When constructing a pier, in a normal reinforced concrete (hereinafter referred to as RC) structure, the higher the height, the more time and labor it takes to arrange and disassemble and disassemble the formwork. Steel pipe / concrete composite structures are often adopted.

  In constructing such a steel pipe / concrete composite structure, first, the steel pipe is erected in advance, and then the rebar is assembled and the PC strand is wound around the steel pipe, and the formwork is installed. Concrete is placed between the formwork and the steel pipe.

  According to such a steel pipe / concrete composite structure, it is possible to perform rapid construction and to improve the earthquake resistance by the steel pipe.

  When standing a steel pipe, it is necessary to firmly fix the lower end of the steel pipe while ensuring sufficient vertical accuracy, but when the ground support layer is shallow, the support layer is exposed and A solid foundation is constructed on the top and the bottom end of the steel pipe is fixed to the solid foundation at the required embedding depth, or when a pile is necessary because the ground support layer is deep, for example, a deep foundation pile is constructed and the There is a method of fixing the lower end of the steel pipe to the deep foundation pile with the required embedding depth.

  In order to fix the lower end of a steel pipe to an RC foundation such as a solid foundation or a deep foundation pile, a pedestal made of steel members is pre-installed in the planned construction area of the RC foundation, and then the steel pipe is erected on the pedestal and Adjustments are made to ensure sufficient installation accuracy and vertical accuracy along the two horizontal directions of the steel pipe, and then concrete is cast to construct the RC foundation.

  If it does in this way, it will become possible to stand a steel pipe in the state where the lower end of the steel pipe was embed | buried in RC foundation only by the desired embedding depth, and it can ensure both the fixed strength and installation precision in a steel pipe base part. .

Japanese Patent No. 2591422 Japanese Patent No. 2536395

  Here, conventionally, as shown in FIG. 4, two bases 101, 101 are laid out so that they are parallel to each other, and then, two positions located on opposite sides of the lower end surface of the steel pipe 102. The steel pipe is erected on the bases 101 and 101 so that the support parts are respectively placed on the bases 101, and the camber is provided between the two support parts and the top surface of the bases 101. The vertical accuracy of the steel pipe 102, that is, the so-called accuracy of the construction was adjusted by appropriately driving a wedge-shaped member called as needed.

  Here, it is desirable that the separation distance L (outer dimension) between the two frames 101, 101 is approximately equal to the outer diameter D of the steel pipe from the viewpoint of installation stability of the steel pipe 102.

  However, as a result, there are two places where the steel pipe 102 supporting parts for the two frames 101, 101 are located on opposite sides, and two places located at angles of 0 ° and 180 ° in the case of a cylindrical cross section. In the direction perpendicular to the laying direction of the gantry 101, 101 (hereinafter referred to as Y ′ direction), the vertical accuracy can be adjusted relatively easily, but in the laying direction of the gantry (hereinafter referred to as X ′ direction), the vertical accuracy can be adjusted. There was a problem that it was difficult to adjust the accuracy.

  That is, in the Y ′ direction, a camber is driven between one of the gantry 101 and the support portion of the steel pipe 102 mounted thereon, thereby separating the distance between the two support portions, that is, the outer diameter D of the steel pipe 102. While the inclination angle can be finely adjusted in the form of the camber thickness, in the X ′ direction, the length range H of the support portion that abuts or faces the upper surface of the gantry 101 is short, so that a slight thickness is required. Even if it is a change, the inclination angle greatly fluctuates, and as a result, it is very difficult to adjust the vertical accuracy in the X ′ direction.

  In addition, positioning along the X ′ direction is performed by accurately positioning a positioning member 103 made of angle steel or the like on the frame so as to be orthogonal to the two frames 101, 101. Although it has been performed by assigning the peripheral surface, the positioning member 103 is bent in the X ′ direction due to the span between the two bases 101, 101, so that the contact position is displaced, and therefore the X ′ direction There was also a problem that the installation accuracy deteriorated.

  In addition, positioning along the Y ′ direction is performed by placing a positioning member 105 made of angle steel, for example, on the upper surface of the gantry 101 and applying the peripheral surface of the steel pipe 102 to the positioning member. In a situation where the distance L between the two bases 101, 101 is set to be approximately the same as the outer diameter D of the steel pipe, the installation space for the positioning member 105 may not be secured on the base 101.

  Further, after the installation positions in the X ′ direction and the Y ′ direction are determined, the two edge portions sandwiching the right angle of the temporary fixing member 104 whose plane shape is a right triangle are respectively formed on the upper surface of the gantry 101 and the peripheral surface of the steel pipe 102. In this state, the lower end of the steel pipe 102 is temporarily fixed to the frame 101 via the temporary fixing member 104 by performing welding along the two edges in this state. For the same reason, it is difficult to secure a sufficient installation space on the gantry 101.

  The various problems described above can be solved to some extent by reducing the distance L between the two bases 101, 101. However, another problem arises that the installation stability of the steel pipe 102 is lowered accordingly.

  The present invention has been made in consideration of the above-described circumstances, and sufficiently secures the vertical accuracy of the steel pipe and the positioning accuracy along the two horizontal directions without lowering the installation stability of the steel pipe, and the lower end of the steel pipe. It is an object of the present invention to provide a steel pipe standing gantry that can be temporarily fixed to a gantry with sufficient strength and a steel pipe erection structure using the same.

  In order to achieve the above object, the steel pipe erection platform according to the present invention includes a RC foundation and a ground before the RC foundation is constructed. And a bundle body standing on the surface of the discarded concrete provided on the boundary surface between the frame body and a gantry body spanned over the bundle material, and the material axes of the gantry body so that the material axes are orthogonal to each other. Is provided with four steel pipe mounting portions arranged so as to extend in the radial direction from the center of the gantry.

  Further, the steel pipe erection frame according to the present invention has the first H-section steel near the center and the second H-section steel and the third H-section are orthogonal to each side of the joining area. One end region of the first H-section steel excluding the joining region is joined from the direction, the first steel pipe placement portion of the four steel pipe placement portions, and the other end region is second. The second H-shaped steel is the third steel pipe mounting portion, and the third H-shaped steel is the fourth steel pipe mounting portion.

The steel pipe erection structure according to the present invention has a steel pipe placed on a predetermined steel pipe erection base and the lower end of the steel pipe is embedded in the RC foundation together with the steel pipe erection base. In a fixed steel pipe standing structure,
The steel pipe erection platform is a bundle that is erected on the surface of the cast-in concrete when the RC foundation is constructed or on the discarded concrete surface provided on the boundary surface between the RC foundation and the ground before the RC foundation is constructed. And a gantry main body spanned by the bundle material, and the gantry main body is arranged with four laid out so that the material axes are orthogonal to each other and the material axes extend in the radial direction from the gantry center. A steel pipe mounting portion is provided.

  Moreover, the steel pipe standing structure which concerns on this invention makes the 2nd H-section steel and the 3rd H-section steel each orthogonal direction to each side of this joining area | region by making the center vicinity of 1st H-section steel into a joining area | region. One end region of the first H-section steel excluding the joining region is a first steel pipe mounting portion of the four steel pipe mounting portions, and the other end region is a second end region. In addition to the steel pipe mounting portion, the second H-shaped steel is used as a third steel pipe mounting portion, and the third H-shaped steel is used as a fourth steel pipe mounting portion.

  In the steel pipe erection stand according to the present invention, a bundle material is erected on the concrete surface, and the gantry body is bridged over the bundle material, and thereafter, steel pipes are mounted on the four steel pipe mounting portions provided in the gantry body. However, the steel pipe mounting portion is disposed so that the material axes thereof are orthogonal to each other and the material shafts extend radially from the center of the gantry.

  Therefore, when the steel pipe is placed on the steel pipe placement portion so that the center of the steel pipe substantially coincides with the center of the pedestal, the lower end face of the steel pipe is placed on each steel pipe placement portion approximately every 90 °, Thus, the steel pipe is stably supported using the steel pipe diameter as the fulcrum distance in any of the two horizontal directions.

  In addition, the vertical accuracy around two horizontal axes orthogonal to each other can be individually adjusted by two sets of steel pipe mounting portions facing each other while fully utilizing the diameter of the steel pipe.

  As the RC foundation, either a pile foundation or a solid foundation may be used. However, in the case of a pile foundation, a bundle material is erected on the surface of the joint concrete at an appropriate joint height. A bundle is erected on the discarded concrete.

  What is necessary is just to fix a bundle material to the concrete surface using what is called a post-construction anchor suitably. As the post-construction anchor, for example, an adhesive anchor such as a chemical anchor (registered trademark, hereinafter omitted) can be employed.

  The bundle material can be configured by appropriately combining steel materials such as angle steel.

  As long as the four steel pipe placement parts are arranged so that the material axes are orthogonal to each other and the material axes extend in the radial direction from the center of the gantry, the specific configuration thereof is arbitrary. The first H-section steel is joined in the vicinity of the center of one H-section steel to each side of the joint area, and the second H-section steel and the third H-section steel are joined from the orthogonal directions, respectively, and the first section excluding the joining area. One end region of the H-shaped steel is a first steel pipe mounting portion of the four steel pipe mounting portions, the other end region is a second steel pipe mounting portion, and the second H The shape steel can be a third steel pipe placement portion, and the third H-shape steel can be a fourth steel pipe placement portion.

  In such a configuration, the plane shape of the four steel pipe mounting portions is a cross shape as a whole.

It is the figure which showed the steel pipe standing structure concerning this embodiment, (a) is a whole front view, (b) is the arrow view seen from the AA line direction. It is the figure which showed the steel pipe standing installation frame which concerns on this embodiment, (a) is a side view, (b) is the arrow view seen from the BB line direction. It is the figure which showed the steel pipe standing structure concerning a modification, (a) is a whole front view, (b) is the arrow view seen from CC line direction. It is the figure which showed the prior art, (a) is a front view, (b) is an arrow view seen from the DD line direction, (c) is an arrow view seen from the EE line direction.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a steel pipe erection frame and a steel pipe erection structure using the same according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a view showing a steel pipe standing structure according to the present embodiment. As can be seen from the figure, the steel pipe standing structure 1 according to the present embodiment has the steel pipe 4 placed on the steel pipe standing base 3 and the lower end of the steel pipe 4 together with the steel pipe standing base is an RC foundation. The steel pipe 4 is embedded and fixed in the deep foundation pile 2 and forms a steel pipe / concrete composite structure pier 5 together with a concrete frame constructed around the steel pipe 4.

  Here, a total of six steel pipes 4 are erected, and each is placed on a separate steel pipe erection platform 3.

  As shown in FIG. 2, the steel pipe standing base 3 is a total of four bundle members 22 standing on the joint concrete surface 6 when constructing the deep foundation pile 2, and a base spanned by the bundle members. The main body 21 is constituted.

  Each bundle 22 is bridged between base plates 23 and 23 placed on the joint concrete surface 6, two bundle bodies 24 and 24 whose lower ends are welded to the base plate, and the top of the bundle body. It comprises a gantry receiver 25.

  Here, when the outer diameter of the steel pipe 4 is about 1,400 mm, the base plate 23 is a steel plate of about 150 mm square, for example, and the bundle main body 24 is an angle steel having a cross section of L-75 × 75 × 6, for example. 25 can be made of angle steel having a cross-section of L-75 × 75 × 6 and a length of about 50 cm. The length of the bundle body 24 is set to, for example, about 100 mm so that the concrete is properly filled between the gantry body 21 and the joint concrete surface 6.

  The gantry body 21 has a H-section steel 28 as a second H-section steel and a third H-section as a second H-section on each side of the junction area with the vicinity of the center of the H-section steel 27 being the first H-section steel as a junction area. H-shaped steel 29 as steel is welded from each orthogonal direction, and one end region 30, the other end region 31, H-shaped steel 28 and H of the H-shaped steel 27 excluding the joining region. The section steel 29 constitutes four steel pipe placement portions arranged such that the material axes are orthogonal to each other and the material axes extend radially from the center of the gantry.

  That is, when an angle is taken from the center of the steel pipe 4 with reference to the horizontal right direction (hereinafter referred to as the X direction) in FIG. 2B, one end region 30 of the H-section steel 27 is a cylindrical steel pipe 4. The lower end face near 0 ° is supported as the first steel pipe mounting portion, and the other end region 31 similarly supports the lower end face near 180 ° as the second steel pipe mounting portion. The H-section steel 28 also supports the lower end surface near 90 ° as the third steel pipe mounting portion, and the H-section steel 29 similarly supports the lower end surface near 270 ° as the fourth steel pipe mounting portion. It is like that.

  Here, the gantry body 21 is configured such that the end regions 30 and 31 of the H-section steel 27, the H-section steel 28 and the H-section steel 29 are respectively placed on the gantry receiver 25 of the bundle 22 in the vicinity of their tips. It comes to be supported by the material.

  In one end region 30 of the H-section steel 27, a positioning member 33 made of angle steel is installed on the upper surface so that the outer surface of one flange is in contact with the upper surface of the end region 30. The horizontal position of the steel pipe 4 along the X direction can be determined by applying the peripheral surface of the steel pipe 4 to the outer surface of the other flange.

  Similarly, the H-shaped steel 29 is provided with a positioning member 34 made of angle steel on the upper surface so that the outer surface of one of the flanges comes into contact with the upper surface of the H-shaped steel 29, and the other By attaching the peripheral surface of the steel pipe 4 to the outer surface of the flange, it is possible to determine the horizontal position of the steel pipe 4 along the Y direction orthogonal to the X direction (see FIG. 2B, hereinafter simply referred to as the Y direction). It has become.

  In addition, the temporary fixing member 32 whose plane shape is a right triangle has two edge portions sandwiching the right angle, the end regions 30 and 31 of the H-shaped steel 27, the upper surfaces of the H-shaped steel 28 and the H-shaped steel 29, and the steel pipe. 4 can be arranged so as to be respectively applied to the peripheral surface of the steel pipe 4. After the positioning of the steel pipe 4 is completed, welding is performed along the two edge portions via the temporary fixing member 32. The lower end of the steel pipe 4 can be temporarily fixed to the gantry body 21 at four locations.

  In order to construct the steel pipe standing structure 1 using the steel pipe standing base 3 according to the present embodiment, first, four bundles 22 are erected on the joint concrete surface 6 when the deep foundation pile 2 is constructed. To do.

  When the bundle material 22 is erected, the base plate 23 is placed on the joint concrete surface 6 and fixed to the joint concrete surface 6 with the chemical anchor 26, and then the lower ends of the bundle material bodies 24, 24 are attached to the base plate 23. What is necessary is just to weld the base support 25 to the upper end, respectively, by welding.

  Next, by placing the end regions 30 and 31 of the H-shaped steel 27, the H-shaped steel 28 and the H-shaped steel 29 on the pedestal receivers 25 of the bundled material 22 installed at four locations, the gantry main body 21 is attached to the bundled material 22. Hang over.

  In installing the bundle material 22 and the gantry main body 21, the positioning is performed along the X and Y directions, and the work is advanced while leveling the gantry main body 21 using the level. Since the jointed concrete surface 6 is the installation surface, the workability is better than when the lower end of the bundle is embedded in fresh concrete in advance, and the positioning accuracy and horizontal accuracy along the two horizontal directions are sufficient. Can be secured.

  Next, the steel pipe 4 is built so that the center of the steel pipe 4 is substantially aligned with the center of the gantry, and then the lower end surface of the steel pipe 4 is connected to the end regions 30 and 31 of the H-shaped steel 27, the H-shaped steel 28 and H The steel pipe 4 is erected on the gantry body 21 by being placed on the upper surface of the shape steel 29.

  Here, since the gantry main body 21 is installed with sufficient horizontal accuracy as described above, when the steel pipe 4 is erected on the gantry main body 21, the vertical accuracy of the steel pipe is sufficiently ensured. For example, a camber or liner plate that is a wedge member is appropriately driven.

  For example, if the vertical accuracy around the Y-direction axis is to be adjusted, the camber is between the end region 30 of the H-section steel 27 and the steel pipe 4 or between the end region 31 of the H-section steel 27 and the steel pipe 4. If the vertical accuracy around the X-direction axis is adjusted, a camber or liner plate is driven between the H-section steel 28 and the steel pipe 4 or between the H-section steel 29 and the steel pipe 4.

  The vertical accuracy of the steel pipe 4 is adjusted by driving a journal jack installed below the steel pipe while collimating the steel pipe 4 with a transit, and lifting a desired side of the steel pipe. What is necessary is just to drive a plate suitably.

  Simultaneously with or after the adjustment of the vertical accuracy, the peripheral surface of the steel pipe 4 is applied to the positioning members 33 and 34 installed on the upper surface of the end region 30 of the H-section steel 27 and the upper surface of the H-section steel 29, and X , The steel pipe 4 is positioned along the Y2 direction.

  When the adjustment of the construction of the steel pipe 4 and the adjustment of the horizontal position are completed, the temporary fixing member 32 is used to connect the four lower peripheral surfaces of the steel pipe 4 to the end regions 30 and 31 of the H-section steel 27, the H-section steel 28 and Each is temporarily fixed to the upper surface of the H-shaped steel 29.

  When the steel pipe 4 is erected in this way, concrete is placed after completion of rebar assembly work and formwork erection work around it, and the lower end of the steel pipe 4 together with the steel pipe erection frame 3 is made concrete. Buried.

  As described above, according to the steel pipe erection frame 3 and the steel pipe erection structure 1 using the same according to the present embodiment, the four steel pipe placement parts of the gantry body 21 on which the steel pipe 4 is placed, that is, Since the end regions 30 and 31 of the H-shaped steel 27, the H-shaped steel 28 and the H-shaped steel 29 are arranged so that their material axes are orthogonal to each other and the material axes extend radially from the center of the gantry. The lower end surface of the steel pipe 4 is placed on each steel pipe placing portion approximately every 90 °.

  Therefore, the steel pipe 4 can be stably supported in the X and Y directions with the outer diameter of the steel pipe 4 as the distance between the fulcrums, and the fulcrum against the thickness change of the camber or liner plate which is a wedge member. Since the distance is sufficiently long, fine adjustment of the vertical accuracy can be easily performed in both the X and Y directions.

  Further, according to the steel pipe erection frame 3 and the steel pipe erection structure 1 using the same according to the present embodiment, the end regions 30, 31 and H of the H-shaped steel 27 which is the steel pipe mounting portion of the gantry body 21 are provided. By arranging the shape steel 28 and the H-shape steel 29 as described above, when the steel pipe 4 is placed on the gantry body 21, a sufficient installation space is formed in front of the steel pipe.

  Therefore, by utilizing this installation space as the installation space for the positioning member, it becomes possible to project the positioning member 33 on the upper surface of one end region 30 of the H-section steel 27, and the steel pipe 4 is provided on the positioning member. The horizontal position of the steel pipe 4 along the X direction can be determined reliably and accurately.

  Similarly, it becomes possible to project the positioning member 34 on the upper surface of the H-shaped steel 29, and the peripheral surface of the steel pipe 4 is applied to the positioning member so that the horizontal position of the steel pipe 4 along the Y direction is reliably and accurately set. It can be determined.

  Incidentally, in the past, when positioning was performed by spanning a long positioning member 103 between two gantry 101, 101 laid in parallel, and contacting the positioning member to the peripheral surface of the steel pipe 102, long However, according to the present embodiment, the positioning members 33 and 34 are positioned in the end region 30 of the H-section steel 27 or the like. Since it protrudes on each upper surface of the H-shaped steel 29, there is no possibility that the positioning accuracy will be lowered due to bending or the like.

  Moreover, by utilizing the installation space described above as the installation space for the temporary fixing member 32, the lower end of the steel pipe 4 is connected to the end regions 30 and 31 of the H-section steel 27, the H-section steel 28 and the temporary fixing member 32. It becomes possible to fix to the upper surface of the H-shaped steel 29 by welding, and thus it becomes possible to securely fix the lower end of the steel pipe 4 to the gantry body 21 reliably.

  In the present embodiment, the application to the case where the RC foundation is the deep foundation pile 2 has been described. However, instead of this, the present invention can also be applied to the case where the RC foundation is a solid foundation.

  FIG. 3 shows an embodiment in which the present invention is applied to a solid foundation 42, and the bundle 22 is erected on a discarded concrete surface 43 provided at the boundary surface between the solid foundation 42 and the ground.

  In this modification, since the pile foundation 2 has substantially the same configuration as that of the above-described embodiment except that the solid foundation 42 is replaced, the detailed description will be omitted. Therefore, by forming the bundle material 22 longer, a bar arrangement space is secured between the gantry body 21 and the discarded concrete surface 43.

  In order to erect the bundle material 22, the pace plate 23 is discarded and fixed to the concrete surface 43, then the lower end bars are arranged, and then the bundle body bodies 24 and 24 are inserted through the gaps of the assembled lower end bars. Then, the lower ends thereof are welded to the base plate 23, and then the pedestal support 25 may be bridged between the bundle main bodies 24 and 24.

  In this embodiment, the construction of the steel pipe 4 is adjusted by using a camber or liner plate which is a wedge member. However, the bundle material 22 stands on the already hardened cast concrete surface 6 and the discarded concrete surface 43. Therefore, it is easy to ensure the horizontal accuracy of the gantry body 21. Therefore, compared to the case where the lower end of the bundle is fixed to uncured concrete, it is less necessary to use a camber or liner plate that is a wedge member, and in some cases, building adjustment using these may be omitted. .

1,41 Steel pipe standing structure 2 Deep foundation pile (RC foundation)
3 Steel pipe standing base 4 Steel pipe 5 Steel pipe / concrete composite structure pier 6 Joint surface 21 Base body 22 Bundling material 23 Base plate (bundling material)
24 Bundled material body (Bundled material)
25 Mounting base (bundle)
27 H-section steel (first H-section steel)
28 H section steel (2nd H section steel, 3rd steel pipe mounting part)
29 H section steel (3rd H section steel, 4th steel pipe mounting part)
One end region of the 30 H-section steel 27 (first steel pipe mounting portion)
The other end region of the 31 H-section steel 27 (second steel pipe mounting portion)
42 Solid foundation (RC foundation)
43 Abandoned concrete surface

Claims (4)

Bundling material standing on the surface of cast-out concrete when building RC foundation or abandoned concrete surface provided at the boundary surface between RC foundation and ground before building RC foundation, and spanning the bundle The gantry body includes four steel pipe mounting portions arranged so that the material axes are orthogonal to each other and the material shafts extend radially from the gantry center. Steel pipe erection stand. The first H-section steel is used as a joining region, and the second H-shape steel and the third H-shape steel are joined to each side of the joining region from the orthogonal directions, respectively, and the first excluding the joining region. One end region of the H-shaped steel is a first steel pipe mounting portion of the four steel pipe mounting portions, and the other end region is a second steel pipe mounting portion, and the second steel pipe mounting portion. The steel pipe standing mount according to claim 1, wherein the H-shaped steel is a third steel pipe mounting portion, and the third H-shaped steel is a fourth steel pipe mounting portion. In the steel pipe standing structure in which the steel pipe is placed on a predetermined steel pipe standing base and the lower end of the steel pipe is embedded and fixed to the RC foundation together with the steel pipe standing base,
The steel pipe erection platform is a bundle that is erected on the surface of the cast-in concrete when the RC foundation is constructed or on the discarded concrete surface provided on the boundary surface between the RC foundation and the ground before the RC foundation is constructed. And a gantry main body spanned by the bundle material, and the gantry main body is arranged with four laid out so that the material axes are orthogonal to each other and the material axes extend in the radial direction from the gantry center. A steel pipe standing structure characterized by comprising a steel pipe mounting portion. The first H-section steel is used as a joining region, and the second H-shape steel and the third H-shape steel are joined to each side of the joining region from the orthogonal directions, respectively, and the first excluding the joining region. One end region of the H-shaped steel is a first steel pipe mounting portion of the four steel pipe mounting portions, and the other end region is a second steel pipe mounting portion, and the second steel pipe mounting portion. The steel pipe standing structure according to claim 3, wherein the H-shaped steel is a third steel pipe mounting portion, and the third H-shaped steel is a fourth steel pipe mounting portion.

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