JP2006265980A - Steel foundation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel foundation structure for easily adjusting axial dislocation between a steel piper foundation and a foundation beam and a difference in a top end level, without generating a waste material, while easily performing disassembling/transfer. <P>SOLUTION: This steel foundation structure has: a steel foundation beam 1 for erecting a plurality of steel main columns 2 on an upper surface; a steel pipe pile 3 pressed in the ground 20 under the respective steel main columns 2; and a joining metallic material 4 interposed between the upper ed of this steel pipe pile 3 and the steel foundation beam 1 and joining both. The joining metallic material 4 has: a pedestal part 5 for placing the steel foundation beam 1; and a fitting-in part 6 projecting on an under surface of this pedestal part 5 and fitted inside the upper end of the steel pipe pile 3 with clearance. An upper end peripheral wall of the steel pipe pile 3 is provided with a joining tool 12 joined to the fitting-in part 6 by penetrating through this peripheral wall and supporting a vertical load acting on the joining metallic material 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steel foundation structure of various buildings configured by installing a steel foundation beam on a steel pipe pile.

  As the basic structure of a conventional building, there are a direct foundation type using a reinforced concrete structure (hereinafter referred to as an RC structure), a pile foundation type using an RC structure, and a steel foundation structure covered with concrete. The direct foundation type by RC construction is constructed by superposing RC foundation beams on the RC foundation base. The RC foundation type pile foundation is to build RC foundation beams on a pile made of PHC or steel pipe. In addition, the steel foundation structure covered with concrete is a steel foundation beam covered with concrete on the RC foundation base.

  However, since the above-mentioned conventional foundation structures all use concrete, a large amount of concrete is generated as industrial waste when demolished. Therefore, for example, in the convenience store, other store buildings, office buildings, etc., as the basic structure of buildings for reuse, etc. that are supposed to be demolished or relocated by relatively short-term use such as several years or more than ten years It is unsuitable.

  Then, this inventor tried the steel foundation structure using a steel pipe pile and a steel foundation beam. However, it is difficult to drive the steel pipe pile with high positional accuracy, and misalignment occurs between the steel foundation beam and the steel pipe pile. Moreover, it is difficult to drive the steel pipe pile to an accurate depth, and it is difficult to match the top level of the steel pipe pile to the steel foundation beam.

  An object of the present invention is to provide a steel foundation structure that can be easily disassembled and moved, no waste material is produced, and the center misalignment between the steel pipe pile and the foundation beam and the difference in the top end level can be easily adjusted. It is to be.

The steel foundation structure of the present invention includes a steel foundation beam in which a plurality of steel main columns are erected on the upper surface, a steel pipe pile press-fitted into the ground under each steel main column, and the steel pipe pile. Between the upper end of the steel base beam and a steel foundation beam, and a joint hardware for joining the steel base beam, the joint hardware projecting to the bottom surface of the base part and the steel pipe pile And a fitting portion that fits into the upper end of the steel pipe with a gap and penetrates the peripheral wall at the upper end of the steel pipe pile and is joined to the fitting portion to support the vertical load acting on the joint hardware. A tool is provided.
According to this configuration, the steel foundation beam is joined to the steel pipe pile with a fastener such as a bolt through the joint hardware without using concrete. No industrial waste is generated. Therefore, it can be effectively applied as the foundation of buildings that are supposed to be demolished or relocated.
In addition, a joint hardware is provided at the upper end of the steel pipe pile, and this joint hardware has a pedestal portion on which the steel foundation beam is placed and a fitting portion that fits with a gap inside the upper end of the steel pipe pile. Therefore, the position of the joint hardware can be adjusted in an arbitrary direction in the horizontal plane within the gap between the inner surface of the steel pipe pile and the fitting portion, and the misalignment of the steel pipe pile with respect to the steel foundation beam can be absorbed. In addition, since the fitting portion is provided as described above and the coupler that penetrates the peripheral wall at the upper end of the steel pipe pile is joined to the fitting portion, the joint hardware is moved up and down with respect to the steel pipe pile, and the ceiling It is easy to adjust the end level.

In the present invention, the coupling tool may be a bolt, and a female screw portion into which the bolt is screwed may be provided in the fitting portion.
When a bolt is used for joining the fitting portion of the metal fitting to the steel pipe pile, assembly and disassembly can be performed more easily. Since the fitting part fits into the steel pipe pile with a gap, the joint structure is not a friction bolt joint, but a joint that supports a vertical load with the bolt, that is, a bearing support joint, but the joint hardware and the steel pipe pile Since it is sufficient that the vertical load can be supported, the necessary bonding strength can be obtained. The vertical joint and the pull-out load caused by the wind load of the building that will be the superstructure act on the joints with the bolts. Any vertical load can be supported by the bolts. .

In this invention, the fitting part of the said metal fitting may consist of a steel pipe whose outer diameter is smaller than the inner diameter of the said steel pipe pile.
If the fitting part is a steel pipe, the structure of the joint hardware can be simplified, it is excellent in strength, and a gap is secured for adjusting the position of the fitting part in each direction within the steel pipe pile. The steel pipe pile can be easily joined to the joint hardware.

  In the present invention, the steel foundation beam has a lower flange, and the pedestal portion of the joint hardware is constituted by a top plate on which the steel foundation beam rests, and the bottom plate and the steel foundation beam under the steel plate. Loose holes partially overlapping each other may be provided in the flange, and the upper plate and the lower flange of the steel foundation beam may be joined to each other by bolts and nuts inserted between the loose holes. In the case of this configuration, the joint hardware and the steel foundation beam can be joined by the loose hole so that the position can be adjusted. Therefore, it is possible to absorb the misalignment by the gap between the fitting portion of the joint hardware and the inner surface of the steel pipe pile, and to absorb the misalignment of the joint hardware with respect to the steel foundation beam. Therefore, it is not necessary to give strict accuracy when joining the metal fitting to the steel foundation beam, the workability is good, and the steel foundation beam can be installed with high accuracy.

  The steel foundation structure of the present invention includes a steel foundation beam in which a plurality of steel main columns are erected on the upper surface, a steel pipe pile press-fitted into the ground under each steel main column, and the steel pipe pile. Between the upper end of the steel base beam and a steel foundation beam, and a joint hardware for joining the steel base beam, the joint hardware projecting to the bottom surface of the base part and the steel pipe pile And a fitting portion that fits into the upper end of the steel pipe with a gap and penetrates the peripheral wall of the upper end of the steel pipe pile and is joined to the fitting portion to support a vertical load acting on the joint hardware. Since the equipment is provided and concrete is not used, disassembly and relocation can be easily performed. In addition, there is no waste material such as concrete debris during dismantling, and it is suitable as a foundation for reuse buildings, etc., and it is easy to adjust the misalignment between the steel pipe foundation and the foundation beam and the difference in the top level during construction. It can be made with excellent workability and installation accuracy.

  An embodiment of the present invention will be described with reference to FIGS. As shown in the sectional view and the perspective view in FIGS. 1 and 2, this steel foundation structure includes a steel foundation beam 1 and a plurality of steel main pillars 2 erected on the steel foundation beam 1. A steel pipe pile 3 that is press-fitted into the ground 20 below, and a metal fitting 4 that is interposed between the upper end of the steel pipe pile 3 and the steel foundation beam 1 to join them together are provided.

  Here, the steel foundation beam 1 is made of H-shaped steel, and a steel main column 2 and a steel intermediate column 17 made of a square steel pipe are erected on the upper flange 1a by bolt joints via base plates. The steel pipe pile 3 is not disposed below the steel stud 17 in the steel foundation beam 1, and the axial force of the steel stud 17 is transmitted by bending the steel foundation beam 1. Here, the steel pipe pile 3 is a rotary press-fitting type made of a round steel pipe.

  The metal joint 4 includes a pedestal portion 5 on which the steel foundation beam 1 is placed, and a fitting portion 6 that protrudes from the lower surface of the pedestal portion 5 and fits inside the upper end of the steel pipe pile 3 with a gap. The pedestal portion 5 is configured by joining an upper surface plate 8 and a lower surface plate 9 to the upper and lower ends of the web plate 7 having a cross-shaped cross section, and the fitting portion 6 projects from the lower surface of the lower surface plate 9.

  The fitting portion 6 of the metal joint 4 is a round steel pipe having an outer diameter smaller than the inner diameter of the steel pipe pile 3 (see FIG. 3B). On the peripheral wall of the fitting portion 6, female screw portions 13 are provided as shown in FIG. 1 at a plurality of positions in the circumferential direction, for example, at four equal positions. These female threaded portions 13 are formed of weld nuts provided on the inner surface of the round steel pipe serving as the fitting portion 6, and are provided in alignment with the bolt insertion holes 14 formed in the peripheral wall of the round steel pipe.

Bolts 12, which are couplers inserted from bolt insertion holes (not shown) provided in the peripheral wall of the steel pipe pile 3, are screwed into the female thread portions 13. The said bolt insertion hole of the steel pipe pile 3 is formed according to the top end level of the metal joint 4 on the spot.
The fitting portion 6 of the metal fitting 4 and the inner surface of the steel pipe pile 3 are not in contact with each other due to the difference in diameter or in contact with only a part in the circumferential direction. Instead of joining, it becomes bearing joining and the vertical load acting on the joining hardware 4 is supported by the plurality of bolts 12.

  As shown in a plan view in FIG. 3 (A), the upper plate 8 of the joint metal 4 and the portion of the lower flange 1b of the steel foundation beam 1 that overlaps the upper plate 8 partially overlap each other. Here, four oval loose holes 10 and 11 are provided. Here, the loose hole 10 of the upper surface plate 8 and the corresponding loose hole 11 of the lower flange 1b are arranged so as to intersect and overlap each other in the orthogonal direction. The top plate 8 and the lower flange 1b are joined to each other by a bolt 15 inserted between the loose holes 10, 11 and a nut 16 screwed into the bolt 15.

Next, the construction procedure of the steel base structure having the above configuration and the surrounding configuration will be described. First, the steel pipe pile 3 is rotationally press-fitted into the root cutting part 21 (FIG. 1) of the ground 20. The pile head of the steel pipe pile 3 is cut to a predetermined level as shown in FIG. 4 (A) in order to remove the buckling portion at the time of press-fitting.
Next, as shown in FIG. 4B, with the magnet base 22 attached to the outer periphery in the vicinity of the top end of the steel pipe pile 3, the fitting portion 6 of the metal fitting 4 is fitted into the steel pipe pile 3 and the magnet The top end level (specifically, the level L in FIG. 4B) of the metal joint 4 is adjusted with a jack with the base 22 as a reference. The bolt insertion hole is drilled in the peripheral wall of the steel pipe pile 3 with a hole saw or the like in accordance with the position of the bolt insertion hole 14 (internal thread portion 13) provided in the fitting portion 6 of the metal fitting 4.

Next, as shown in FIG. 4C, the bolt 12 inserted from the bolt insertion hole drilled in the steel pipe pile 3 is screwed into the female screw portion 13 of the fitting portion 6 in the joint metal piece 4. Thereby, the vertical load which acts on the metal joint 4 can be supported by the bolt 12.
Since the fitting portion 6 of the joint hardware 4 is formed to have an outer diameter that creates a gap with respect to the inner surface of the steel pipe pile 3, the center of the joint hardware 4 is adjusted to the steel pipe pile by adjusting the tightening amount of each bolt 12. 3, and by this adjustment, it is possible to absorb the shift in the driving position of the steel pipe pile 3. Moreover, even if the steel pipe pile 3 inclines because of the said clearance gap, it becomes possible to level the top end surface of the metal joint 4.
In addition, you may use pins, such as a drift pin, instead of the said volt | bolt 12 as a coupling tool which joins the steel pipe pile 3 to the fitting part 6. FIG. In this case, only a pin fitting hole is provided in the peripheral wall of the fitting portion 6, and the pin is driven into the hole in the peripheral wall of the fitting portion 6 from the hole processed in the peripheral wall of the steel pipe pile 3. Thus, the steel pipe pile 3 is coupled to the fitting portion 6.

  Next, as shown in FIG. 4D, the steel foundation beam 1 is placed on the pedestal portion 5 of the joint hardware 4, and the loose hole 11 of the lower flange 1 b in the steel foundation beam 1 from the loose hole 10 of the pedestal top surface plate 8. The bolt 15 is inserted in between. The nut 16 is screwed onto the bolt 15 and tightened to join the pedestal top plate 8 and the lower flange 1b of the steel foundation beam 1 to each other. At this time, since the bolt 15 is inserted through the loose holes 10 and 11 partially overlapping each other, it is possible to adjust the position of the steel foundation beam 1 with respect to the metal joint 4.

  Thereafter, as shown in FIG. 1, most of the root cutting portion 21 of the ground 20 is backfilled with backfill soil 23. A concrete block 24 is arranged on the outdoor side portion of the steel foundation beam 1 through a mortar 24, and the entire outdoor side portion of the steel foundation beam 1 including the concrete block 24 is covered with a mortar presser 25A and a mortar brush drawing 25B. Further, the portion of the mortar presser 25A is covered with a draining metal piece 26. Thereafter, asphalt pavement 27 is applied from the backfill soil 23 on the outdoor side portion to the upper surface of the ground 20.

  At the indoor side of the steel foundation beam 1, a crushed stone industry 28 is applied on the backfill soil 23, and a plywood, a floor panel material, a level adjusting layer, a moisture-proof film, etc. are laminated on the floor 29. To do. In addition to this, the structure of the floor portion 29 may be a soil floor made of concrete or mortar. On the steel foundation beam 1, a steel main pillar 2 and a steel stud 17 of a building which is an upper structure are erected by bolting, and between the adjacent steel main pillar 2 and the steel stud 17. The outer wall panel 31 is attached to the outside of the panel frame member 30 provided in

  According to the steel foundation structure having this configuration, the steel foundation beam 1 is joined to the steel pipe pile 3 with a fastener such as a bolt via the joint hardware 4 without using concrete, so that the disassembly is easy.・ By using the building for the relocation, the building can be easily dismantled and relocated. In addition, if the steel pipe pile 3 is a rotary press-fitting type as in the embodiment, the steel pipe pile 3 can be removed from the ground 20 by rotating it reversely from the press-fitting time. Relocation can be performed more easily.

  Moreover, in this embodiment, since the fitting part 6 of the metal fitting 4 was comprised with the steel pipe whose outer diameter is smaller than the internal diameter of the steel pipe pile 3, the fitting part of the metal fitting 4 inside the steel pipe pile 3 is comprised. By fitting 6, the steel pipe pile 3 can be easily coupled to the joint hardware 4. Moreover, the position adjustment and inclination adjustment of the joining hardware 4 with respect to the steel pipe pile 3 are also attained, and the position shift and inclination of the driving position of the steel pipe pile 3 can be absorbed.

  Moreover, in this embodiment, the steel foundation beam 1 has the lower flange 1b, and the part on which the steel foundation beam 1 of the pedestal part 5 of the joint hardware 4 rests is constituted by the upper surface plate 8, and the upper surface plate 8 and the steel Loose holes 10, 11 that partially overlap each other on the lower flange 1 b of the base beam 1 are provided, and the upper plate 8 and the lower flange 1 b are provided by bolts 15 and nuts 16 that are inserted between the loose holes 10, 11. Are joined to each other, so that the joint hardware 4 and the steel foundation beam 1 can be joined so that their positions can be adjusted. Therefore, in combination with the position adjustment function of the fitting portion 6 of the joint hardware 4, a high misalignment absorption function can be obtained, and the steel base structure can be easily constructed.

  In addition, in the said embodiment, although the fitting part 6 of the metal fitting 4 was comprised with the round steel pipe, as shown not only in this but in a top view and a side view in FIG. 5 (A), (B), A plurality (four in this case) of strip-shaped steel plate members 6a may be configured to protrude from the lower surface plate 9. In this case, the plurality of steel plate members 6 a are arranged so that their circumscribed circles have a smaller diameter than the inner diameter of the steel pile 3. Each steel plate member 6a is provided with an insertion hole 14 for a bolt 12 penetrating the peripheral wall of the steel pile 3, and a female screw portion 13 that is aligned with the insertion hole 14 is provided on the inner surface of the steel plate member 6a.

  Moreover, in the said embodiment, although the base part 5 of the metal fitting 4 was comprised with the upper surface board 8, the lower surface board 9, and the web plate 7 pinched | interposed into these both board | plates, it is a side surface to FIG. As shown in the drawings and plan view, the pedestal portion 5A may be configured with only one face material. The pedestal portion 5A has a rectangular shape in which both end portions of the steel foundation beam 1 placed on the pedestal portion extend in the longitudinal direction from the position of the fitting portion 6 and the loose holes are formed in both projecting portions. 10 is provided. In the lower flange 1b of the steel foundation beam 1, a loose hole 11 is provided at a position overlapping the loose hole 10 of the pedestal portion 5A. The arrangement relationship between the loose holes 10 and 11 is the same as in the above embodiment. Thus, by providing the loose hole 10 in the projecting portion of the pedestal portion 5A, the pedestal portion 5 and the steel pile 3 are not hindered even if the pedestal portion 5A is constituted by only one face material. The lower flange 1 b of the steel foundation beam 1 can be easily joined with the bolt 15 and the nut 16.

It is sectional drawing which shows the steel foundation structure concerning one Embodiment of this invention. It is a perspective view which shows schematic structure of the steel base structure. (A) is a fracture | rupture top view which shows the junction part of steel foundation beams and a joining metal fitting, (B) is a fracture | rupture top view of a joining fitting. It is explanatory drawing which shows the construction procedure of the steel foundation structure. (A) is a fracture | rupture top view which shows the other example of a joining metal fitting, (B) is the same side view. (A) is a side view of the steel base structure using the joining metal fitting of another example of composition, and (B) is a fracture top view of the steel base structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steel foundation beam 1b ... Lower flange 2 ... Steel main pillar 3 ... Steel pipe pile 4 ... Joint metal 5,5A ... Base part 6 ... Insertion part 8 ... Top plate 10, 11 ... Loose hole 12 ... Bolt ( Coupler)
13 ... Female thread 15 ... Bolt 16 ... Nut 20 ... Ground

Claims (4)

  A steel foundation beam in which a plurality of steel main columns are erected on the upper surface, a steel pipe pile press-fitted into the ground under each steel main column, and the upper end of the steel pipe pile and the steel foundation beam A metal fitting that joins both of the steel base beams, and the metal fitting has a gap between the pedestal portion on which the steel foundation beam is mounted and the upper end of the steel pipe pile protruding from the lower surface of the pedestal portion. A steel base structure having a fitting portion that fits, and provided with a coupler that supports a vertical load that penetrates the peripheral wall at the upper end of the steel pipe pile and is joined to the fitting portion and acts on the metal fitting.   The steel foundation structure according to claim 1, wherein the fitting portion of the joint hardware is a steel pipe having an outer diameter smaller than an inner diameter of the steel pipe pile.   3. The steel foundation beam according to claim 1 or 2, wherein the steel foundation beam has a lower flange, and the pedestal part of the joint hardware is constituted by a top surface plate on which the steel foundation beam rests. Steel with a loose hole partially overlapping with the lower flange of the steel foundation beam, and the upper plate and the lower flange of the steel foundation beam joined together with bolts and nuts inserted between the loose holes Made foundation structure. The steel foundation structure according to any one of claims 1 to 3, wherein the coupler is a bolt, and a female screw portion into which the bolt is screwed is provided in the fitting portion.

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