JP5010437B2 - Substructure - Google Patents

Description

  The present invention relates to a foundation structure, and more particularly to a method for connecting a foundation beam and a foundation pile in a one-column / one-pile foundation structure.

When one pillar and one pile foundation structure with an independent foundation pile for each pillar and rigidity in the foundation is required due to weight balance, etc., each steel pipe foundation pile is connected with a steel foundation beam. It is common to increase planar rigidity. For example, in Patent Document 1, as shown in FIG. 13, an upper structure includes a lower structure 61 provided in the ground and an upper structure 62 built on the lower structure 61. The steel pipe foundation pile 63 and the steel foundation beam 64 which connects the steel pipe foundation pile 63 are disclosed.
In the above building structure, the steel pipe foundation pile 63 needs to be built in accurately, and when an error in placing the steel pipe foundation pile 63 occurs, a great adjustment is required regarding the joining of the steel foundation beam 64. Met. Therefore, Patent Document 1 proposes to devise a joint structure between the steel pipe foundation pile 63 and the steel foundation beam 64 to absorb the placing error.

  For example, as shown in FIG. 14, the steel pipe foundation pile 63 and the steel foundation beam 64 are obtained by machining a male joint fitting 67 at the tip of a female joint fitting 66 that is processed and attached to a pile head 65 of the steel pipe foundation pile 63. It is shown that the steel foundation beam 64 is inserted and the concrete 68 is filled therein to join them. As another example, as shown in FIG. 15, a steel product in which a male joint fitting 73 having an H-shaped cross section is fixed to the tip of a slit 71 inserted in the axial direction of the pile head 70 of the steel pipe foundation pile 69. It is shown that the foundation beam 74 is inserted, the concrete 75 is filled in the steel pipe foundation pile 69, and the steel pipe foundation pile 69 and the steel foundation beam 74 are joined.

About the method of joining a steel pipe foundation pile and a steel foundation beam, this inventor is making the following proposal in patent document 2. FIG. That is, as shown in FIG. 16, Patent Document 2 is characterized in that a foundation beam support means 84 for supporting a steel foundation beam 82 is provided. The foundation beam support means 84 is mainly configured by an opening 85 provided on a side surface of a joining unit 80 provided at an upper end of a steel pipe foundation pile (not shown), a connection piece 86, and a splice plate 87.
The opening 85 is a hole in a rectangular shape in plan view that penetrates in the plate thickness direction of the bonding unit 80, and the protrusion 86 a of the connection piece 86 protrudes outside the bonding unit 80 through the opening 85. It has become. Further, a sealing member (not shown) is provided between the connection piece 86 and the joining unit 80, and the concrete filled in the joining unit 80 does not leak from between the protrusion 86a and the opening 85. It is like that.
The splice plate 87 connects the projection 86a of the connection piece 86 and the web 83 of the steel foundation beam 82. One end of the splice plate 87, the projection 86a of the connection piece 86, and the other end of the splice plate 87 are connected. And the web 83 of the steel foundation beam 82 are joined by appropriate means such as fillet welding.

  According to the structure of Patent Document 2, the angle of the connection piece 86 and the vertical position of the protrusion 86a of the connection piece 86 in the opening 85 can be easily changed. Can be easily installed at a height of Moreover, the opening part 85 which the protrusion part 86a of the connection piece 86 penetrates is provided in the side surface of the joining unit 80 located near the surface of the ground, and the steel foundation beam 82 is located near the surface of the ground. Therefore, the digging depth of the steel foundation beam 82 can be reduced, the work period can be shortened, and the work cost can be reduced.

JP 2002-309591 A JP 2007-63854 A

In the proposal of FIG. 11 (FIG. 11), concrete 75 is filled between the male joint fitting 67 and the steel pipe foundation pile 63, but when a tensile force is applied from the steel foundation beam 64, the male joint fitting 67 and the steel pipe. Depending on the setting of the concrete strength and clearance between the foundation piles 63, the concrete 75 may be crushed and the predetermined performance may not be exhibited.
The problem of concrete crushing occurs in other proposals (FIG. 12) of Patent Document 1, between the male joint fitting 73 and the steel pipe foundation pile 69, and in the proposal of Patent Document 2 as well. It occurs between the foundation piles 63.
The present invention has been made based on such a technical problem. In a one-column / one-pile foundation structure in which each steel pipe foundation pile is connected with a steel foundation beam to enhance planar rigidity, concrete collapses. It aims at providing the connection structure of the steel pipe foundation pile and the steel foundation beam which does not have a fear.

For this purpose, the foundation structure of the present invention comprises a plurality of steel pipe foundation piles erected on the ground, and a steel foundation beam buried in the ground and connecting adjacent steel pipe foundation piles. The locking body attached to the tip of the steel foundation beam is placed opposite to the inner peripheral surface of the steel pipe foundation pile with a predetermined gap, and the tip of the bolt screwed into the locking body is inside the steel pipe foundation pile. A predetermined interval is maintained in contact with the peripheral surface, and the steel pipe foundation pile is filled with concrete including between the locking body and the inner peripheral surface.
The foundation structure of the present invention joins the steel foundation beam and the steel pipe foundation pile by filling the inner peripheral surface of the locking body attached to the tip of the steel foundation beam and the steel pipe foundation pile with concrete. . In this joint structure, even if a tensile force is applied to the steel foundation beam due to the bolt interposed between the locking body and the inner peripheral surface of the steel pipe foundation pile, the force from the locking body Therefore, the concrete filled between the locking body and the inner peripheral surface of the steel pipe foundation pile is prevented from being crushed.

In the foundation structure of the present invention, a hole through which the steel foundation beam passes is formed in the steel pipe foundation pile, and the steel foundation beam penetrates through this hole, and the locking body faces the inner peripheral surface of the steel pipe foundation pile. When arrange | positioning, it is preferable that the ring-shaped reinforcement rib was joined to the upper side and lower side of a hole. This is to compensate for the strength reduction of the steel pipe foundation pile due to the presence of the hole through which the steel foundation beam penetrates.
In the foundation structure of the present invention, the number of bolts is not limited, and a plurality of bolts can be arranged at positions spaced apart by a predetermined distance in the horizontal direction, or a plurality of bolts can be arranged at positions spaced apart by a predetermined distance in the vertical direction in the horizontal direction. You can also
Moreover, in the foundation structure of the present invention, it is preferable to include a vertical direction positioning means for positioning the steel pipe foundation pile at the tip of the steel foundation beam in the vertical direction. This is to adjust the joining state between the steel foundation beam and the steel pipe foundation pile.

  According to the present invention, the force transmission between the locking body locked to the steel pipe foundation pile via the concrete and the inner peripheral surface of the steel pipe foundation pile is performed via the bolt. There is no risk of concrete crushing even if tensile force is generated.

<First Embodiment>
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
Drawing 1 is a sectional side view of the 1 pillar 1 pile foundation structure concerning this embodiment. This one-column / one-pile foundation structure 10 is mainly composed of a steel pipe foundation pile 11 embedded in the ground G and a joining unit (joining member) 12 arranged vertically above the steel pipe foundation pile 11. Since the joining unit 12 has the same form as the steel pipe and functions as a part of the pile, it corresponds to the steel pipe foundation pile of the present invention.
The steel pipe foundation pile 11 has, for example, a wing (not shown) at its lower end, and is rotationally press-fitted into the ground G by a press-fitting machine or the like until its tip reaches a support layer (not shown). Has been.
The joining unit 12 is, for example, a cylindrical member having substantially the same outer diameter as the steel pipe foundation pile 11, and an upper end thereof is opened to easily receive the bottom plate 13 a of the column base 13. A bottom plate 12 a is provided at the lower end of the joining unit 12.
These steel pipe foundation piles 11 and the joining unit 12 are joined by welding, for example.

  In the internal space of the joining unit 12, the lower end portion of the column base 13 positioned, for example, having a quadrilateral cross section is accommodated, and the joining unit 12 and the column base 13 are filled in the inside of the joining unit 12. The concrete 14 is joined.

The construction method of the 1 pillar 1 pile foundation structure 10 shown in FIG. 1 is demonstrated using FIG.
First, a hole 15 is dug in the ground G at a predetermined position where the steel pipe foundation pile 11 is to be embedded. The diameter of the hole 15 is made larger than the diameter of the steel pipe foundation pile 11. After the steel pipe foundation pile 11 is erected in the hole 15, the steel pipe foundation pile 11 is rotationally press-fitted into the ground G using a not-shown press-fitting machine or the like until the tip of the steel pipe foundation pile 11 reaches the support layer (see FIG. 2A). ).
After mounting the joining unit 12 on the pile head of the steel pipe foundation pile 11 and matching the core of the steel pipe foundation pile 11 and the core of the joining unit 12, these steel pipe foundation pile 11 and the joining unit 12 are joined by welding, for example. . After the joining of the steel pipe foundation pile 11 and the joining unit 12 is completed, the hole 15 is partially backfilled so that only the open end of the joining unit 12 appears on the surface of the ground G (see FIG. 2B).
Thereafter, the steel foundation beam 20 is joined to the joining unit 12, and when it is finished, the hole 15 is completely backfilled. At this time, the steel foundation beam 20 is also buried. The structure for joining the steel foundation beam 20 to the joining unit 12 will be described later.

Next, the tip end portion of the column base 13 is inserted into the internal space of the joining unit 12 through the opening end of the joining unit 12, and the core of the joining unit 12 and the core of the column base 13 are aligned using a positioning device ( (Refer FIG.2 (c)).
In this state, the concrete 14 is filled in the internal space of the joining unit 12, the joining unit 12 and the column base 13 are joined, and the construction of the foundation structure is completed (see FIG. 2 (d) and FIG. 1). The backfilling of the holes 15 may be performed after completion of a series of operations until the column base is fixed.

Next, a structure for joining the steel foundation beam 20 to the joining unit 12 will be described with reference to FIGS. In addition, description of the concrete 14 is abbreviate | omitted in FIGS. Further, only one joint portion between the joint unit 12 and the steel foundation beam 20 is described.
The 1 pillar 1 pile foundation structure 10 in this embodiment is provided with a foundation beam support means 21 for supporting a steel foundation beam 20, and the foundation beam support means 21 is crushed by the concrete 14 placed therein. It is characterized in that a function for preventing the problem is added.

The foundation beam support means 21 is configured with an opening 23 provided on the side surface of the joining unit 12, a connection piece 22, and a splice plate 24 as main elements.
The opening 23 is a hole in a rectangular shape in plan view that penetrates in the plate thickness direction of the bonding unit 12, and the protrusion 22 a of the connection piece 22 protrudes outside the bonding unit 12 through the opening 23. It has become. Further, a seal member (not shown) is provided between the connection piece 22 and the joining unit 12, and the concrete 14 filled in the joining unit 12 leaks from between the protrusion 22 a and the opening 23. There is no such thing.
The splice plate 24 connects the protrusion 22 a of the connection piece 22 and the web 20 a of the steel foundation beam 20. One end of the splice plate 24, the protrusion 22 a of the connection piece 22, and the other end of the splice plate 24. And the web 20a of the steel foundation beam 20 are joined by, for example, bolt joining. The connection piece 22 and the splice plate 24 can be regarded as constituting a part of the steel foundation beam 20.

A screw hole 22 b that meshes with the bolt 25 is formed in the connection piece 22 through the connection piece 22. The screw holes 22b are formed at two locations at a predetermined interval in the width direction (horizontal direction) of the connection piece 22. The bolt 25 passes through the connection piece 22 through the screw hole 22 b, and the tip of the screw portion is in contact with the inner wall of the joining unit 12. Therefore, when a tensile force is applied to the steel foundation beam 20, the force from the connection piece 22 is transmitted to the joining unit 12 via the bolt 25, so that the inner peripheral surface of the joining unit 12 within the joining unit 12. Crushing of the concrete 14 filled between the plate-like portion (locking body) of the connecting piece 22 and the joining unit 12 that is disposed opposite to each other is prevented.
One bolt 25 is installed on each side in the horizontal direction with the projection 22a of the connection piece 22 as a boundary. Therefore, it is possible to adjust the horizontal position and the rotation direction of the connection piece 22 according to the tightening condition of the bolt 25.

Reinforcing ribs 26 are provided on the inner peripheral surface of the joining unit 12. One reinforcing rib 26 is provided on each of the upper side and the lower side of the opening 23. The reinforcing rib 26 joins the steel ring-shaped member to the inner peripheral surface of the joining unit 12 by welding.
Since the upper end of the joining unit 12 is open with respect to the tensile force from the steel foundation beam 20, a problem may occur in strength. Further, the strength may be partially reduced in the opening 23. Therefore, the ring-shaped reinforcing rib 26 is reinforced by welding the upper and lower portions of the opening 23. In addition, the reinforcing rib 26 has an effect of improving the adhesion performance of the concrete 14 filled in the joining unit 12.

Moreover, according to the 1 pillar 1 pile foundation structure 10 by this embodiment, since the angle of the connection piece 22 and the position of the up-down direction of the protrusion 22a of the connection piece 22 in the opening part 23 can be changed easily. The steel foundation beam 20 can be easily installed at a desired height.
Furthermore, the opening part 23 which the protrusion part 22a of the connection piece 22 penetrates is provided in the side surface of the joining unit 12 located near the surface of the ground G, and the steel foundation beam 20 is located near the surface of the ground G. Therefore, the digging depth of the steel foundation beam 20 can be reduced, the work period can be shortened, and the work cost can be reduced.

Second Embodiment
The 1 pillar 1 pile foundation structure 30 which concerns on 2nd Embodiment by this invention is demonstrated with reference to FIGS.
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the following description will focus on differences from the first embodiment. 6 to 9, the same parts as those in the first embodiment are denoted by the same reference numerals.
In the second embodiment, the foundation beam support means 31 is configured with the opening 23 provided on the side surface of the joining unit 12, the connection piece 32, the vertical support plate 33, and the splice plate 24 as main elements. Yes.
Although the connection piece 32 has a T-shape, the protrusions 32b are suspended from both front and back surfaces of the protrusion 32a.
The vertical support plate 33 disposed between the protrusion 32b of the connection piece 32 and the joining unit 12 passes through a hole 33a through which the protrusion 32a of the connection piece 32 passes and a symmetrical position with the hole 33a as a center. Two bolt holes 33b are formed. Since the bolt hole 33b is a long hole, the vertical support plate 33, that is, the connection piece 32 can be fixed at an arbitrary position in the vertical direction.

The connection piece 32 is arranged in the joining unit 12 so that the tip end portion of the protrusion 32a protrudes to the outside.
The bolt 34 passes through the bolt hole 33 b of the vertical support plate 33, and the tip of the bolt 34 is screwed into a nut 35 fixed to the joining unit 12. On the other hand, the vertical support plate 33 is in contact with the surface of the projection 32 b of the connection piece 32 on the side of the joining unit 12.

  According to the second embodiment described above, the connection piece 32 can be positioned by adjusting the vertical position of the vertical support plate 33 and tightening the bolt 34. If the connection piece 32 is positioned and the position of the connection piece 32 in the horizontal direction and the rotation direction is adjusted by tightening the bolt 25, a more accurate adjustment can be performed.

<Third Embodiment>
The 1 pillar 1 pile foundation structure 50 which concerns on 3rd Embodiment by this invention is demonstrated with reference to FIGS.
The first embodiment is characterized in that two bolts 25 are provided in the horizontal direction, whereas the third embodiment is characterized in that two bolts 25 are also provided in the vertical direction. 10-12, the same code | symbol is attached | subjected to the part similar to 1st Embodiment.
With this configuration, the strength capable of transmitting between the steel foundation beam 20 and the joining unit 12 is also improved. Furthermore, since not only the planar rotation of the connecting piece 22 but also the position of the vertical rotation can be adjusted, even when a slight inclination in the vertical direction occurs in the steel foundation beam 20 in construction, Rather than adjusting by applying external force, the connection piece 22 can be adjusted in the construction process.

  In the said embodiment, although the joining unit 12 was demonstrated, this invention is applicable with respect to the steel pipe foundation pile 11. FIG. Other than this, as long as the gist of the present invention is not deviated, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

It is a sectional side view which shows schematic structure of the foundation structure by 1st Embodiment. It is a fragmentary sectional view which shows the construction process of the foundation structure by 1st Embodiment. It is a figure which shows the junction part of the steel foundation beam and steel pipe foundation pile of a foundation structure by 1st Embodiment, Comprising: It is CC sectional view taken on the line of FIG. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 3. It is a top view which shows the junction part of the steel foundation beam and steel pipe foundation pile of a foundation structure by 2nd Embodiment, Comprising: It is FF arrow sectional drawing of FIG. It is DD sectional view taken on the line of FIG. It is EE arrow sectional drawing of FIG. It is a perspective view which shows the vertical direction support plate and joining piece used for 2nd Embodiment, (a) shows the vertical direction supporting plate, (b) has shown the joining piece. It is a top view which shows the junction part of the steel foundation beam and steel pipe foundation pile of a foundation structure by 3rd Embodiment, Comprising: It is the II arrow sectional drawing of FIG. It is GG arrow sectional drawing of FIG. It is HH arrow sectional drawing of FIG. It is a figure which shows the building structure disclosed by patent document 1. FIG. It is sectional drawing which shows the example of joining of the steel foundation beam and steel pipe foundation pile of a building structure disclosed by patent document 1. FIG. It is sectional drawing which shows the other joining example of the steel foundation beam and steel pipe foundation pile of a building structure disclosed by patent document 1. FIG. It is a figure which shows the example of joining of the steel foundation beam and steel pipe foundation pile of a building structure disclosed by patent document 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 30, 50 ... 1 pillar 1 pile foundation structure, 11 ... Steel pipe foundation pile, 12 ... Joining unit, 13 ... Column base, 14 ... Concrete, 20 ... Steel foundation beam, 21, 31 ... Foundation beam support means, 22 32 ... Connection piece, 23 ... Opening, 24 ... Splice plate, 25, 34 ... Bolt, 26 ... Reinforcement rib, 33 ... Vertical support plate, 35 ... Nut

Claims (5)

A plurality of steel pipe foundation piles erected on the ground;
A steel foundation beam embedded in the ground and connecting the steel pipe foundation piles adjacent to each other,
The locking body attached to the tip of the steel foundation beam is disposed opposite to the inner peripheral surface of the steel pipe foundation pile with a predetermined interval,
The tip of the bolt screwed into the locking body is in contact with the inner peripheral surface of the steel pipe foundation pile, and the predetermined interval is maintained,
A foundation structure characterized in that concrete is filled in the steel pipe foundation pile including between the locking body and the inner peripheral surface. A hole through which the steel foundation beam penetrates is formed in the steel pipe foundation pile, and the steel foundation beam penetrates through the hole, and the locking body is arranged to face the inner peripheral surface of the steel pipe foundation pile. ,
The foundation structure according to claim 1, wherein ring-shaped reinforcing ribs are joined to the upper side and the lower side of the hole.   The foundation structure according to claim 1 or 2, wherein a plurality of the bolts are arranged at positions spaced apart by a predetermined distance in the horizontal direction.   The foundation structure according to any one of claims 1 to 3, wherein a plurality of the bolts are arranged at positions separated by a predetermined interval in the vertical direction.   The foundation structure according to any one of claims 1 to 4, further comprising a vertical positioning means for positioning the tip of the steel foundation beam in the vertical direction of the steel pipe foundation pile.

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