JP5896529B2 - Foundation structure - Google Patents

Description

  The present invention relates to a foundation structure for supporting a structure.

Conventionally, the following simple foundations have been proposed as the basis for simple structures such as playground equipment in a park, an arbor, a fence, and a temporary housing.
That is, a simple foundation is provided with the hollow and substantially spherical main body member which has a pile member penetration part, and the pile member inserted in the ground through the pile member penetration part of this main body member. These pile members extend inclined with respect to the ground surface.

JP 2007-247249 A

  However, when the simple foundation as described above is provided on soft ground such as a paddy field, the frictional force between the pile and the ground decreases, so when a pulling force or pushing force acts on the main body member, the main body member acts on the pile member. On the other hand, there was a possibility that the relative movement of the pile member could not be secured due to relative movement.

  An object of this invention is to provide the foundation structure which can transmit the supporting force by a steel pipe reliably to a main body also in soft ground.

  The foundation structure according to claim 1 (for example, the below-described foundation structure 1) includes a foundation jig (for example, the below-described foundation jig 10, 10A, 10B, 10C, 10D) and the foundation jig. 4 fixed steel pipes (for example, steel pipes 20, 20A, 20B, 20C, 20D described later), and the foundation jig is provided on a main body (for example, main body 11 described later) and the main body. And four cylindrical tube parts (for example, cylinder parts 12, 12A, 12B, 12C, 12D described later) through which the steel pipe is inserted, and a fixing jig (for example, described later) for fixing the steel pipe to the cylinder part. Bolts 30, hairpins 30 </ b> A, fixing jigs 30 </ b> B, 30 </ b> C, 30 </ b> D), and the central axes of the four cylindrical portions are inclined with respect to the axial direction of the main body and extend without interfering with each other The four steel pipes are at least partially Characterized in that it is driven into the ground.

  According to this invention, the steel pipe is inserted into the cylindrical portion provided in the main body, and at least a part of the steel pipe is driven into the ground to function as a pile. At this time, since the steel pipe is fixed to the cylindrical portion, even if a pulling force or a pushing force acts on the main body, the main body can be prevented from moving relative to the steel pipe. Therefore, the supporting force by the steel pipe can be reliably transmitted to the main body even in soft ground.

In the basic structure of the present invention , a screw hole (for example, a screw hole 15 to be described later) is provided in the cylinder portion (for example, a cylinder portion 12 to be described later) that penetrates the cylinder portion and is formed with an internal thread. The fixing jig is preferably a bolt (for example, a bolt 30 described later) or a screw that is screwed into the screw hole.

  According to this invention, a bolt or a screw is screwed into a screw hole and tightened so that the outer surface of the steel pipe inserted into the cylindrical portion is pressed at the tip of the bolt or screw, and the outer surface of the steel pipe is pressed into the cylindrical portion. Press against the inside. Thereby, a steel pipe is fixed to a cylinder part reliably and it can prevent easily that a main body moves relatively with respect to a steel pipe.

The basic structure of the present invention includes a first through hole (for example, a predetermined position A described later) in a predetermined position (for example, a predetermined position A described later) of the cylindrical portion (for example, a cylindrical portion 12A described later) and the steel pipe (for example, a steel pipe 20A described later). For example, first through holes 17 and 24, which will be described later, are formed, and a second through hole (for example, a later described) is formed at a position (for example, a position B which will be described later) facing the predetermined position of the cylindrical portion and the steel pipe. the second through holes 18, 25) is formed, the fixture is preferably the first pin is inserted into the through hole and the second through-hole (e.g., a hairpin pin 30A) described later.

  According to this invention, the pin is locked to the through hole of the tubular portion and the steel pipe by inserting the pin through the first through hole and the second through hole. Thereby, a steel pipe is fixed to a cylinder part reliably and it can prevent easily that a main body moves relatively with respect to a steel pipe.

The basic structure according to claim 1 includes a first position at a predetermined position (for example, a predetermined position A described later) of the cylindrical portion (for example, a cylindrical section 12B described later) and the steel pipe (for example, a steel pipe 20B described later). Through holes (for example, first through holes 17 and 24 described later) are formed, and a second through hole (for example, a position B described later) is formed at a position (for example, a position B described later) facing the predetermined position of the tubular portion and the steel pipe. , Second through holes 18, 25), which will be described later, are formed, and the fixing jig includes a first locking portion (for example, a first locking portion 31 described later) inserted through the first through hole, Energizing the second locking portion (for example, a second locking portion 32 described later) inserted through the second through hole, and the first locking portion and the second locking portion in a direction away from each other. And an urging unit (for example, an urging unit 33 described later).

  According to the present invention, the fixing jig is inserted into the steel pipe, the first locking portion of the fixing jig is inserted into the first through hole, and the second locking portion is inserted into the second through hole. To do. Then, these latching | locking parts are urged | biased from the inner side to the outer side by the urging | biasing part, and latch to the through-hole of a cylinder part and a steel pipe. Thereby, a steel pipe is fixed to a cylinder part reliably and it can prevent easily that a main body moves relatively with respect to a steel pipe.

In the basic structure of the present invention, the fixing jig (for example, a fixing jig 30C described later) has a cylindrical shape that covers at least a part of the steel pipe, and the thickness of the fixing jig is from the tip side of the steel pipe. It is preferable that it becomes large as it goes to the base end side.

  According to this invention, the fixing jig is attached to the steel pipe, and in this state, the steel pipe is inserted into the cylindrical portion. At this time, as the fixing jig deeply enters the inside of the cylindrical portion, the fixing jig enters the gap between the outer surface of the steel pipe and the inner surface of the cylindrical portion. Thereby, a steel pipe is fixed to a cylinder part reliably and it can prevent easily that a main body moves relatively with respect to a steel pipe.

In the basic structure of the present invention , a notch (for example, a notch 19 described later) is formed in the cylinder (for example, a cylinder 12D described later), and a part of the steel pipe is exposed. The fixing jig (for example, a fixing jig 30D described later) is preferably attached to a portion exposed from the notch portion of the steel pipe.

  According to the present invention, when the steel pipe is inserted into the cylindrical portion, a part of the steel pipe is exposed from the notch portion. In this state, when a fixing jig is attached to the exposed portion of the steel pipe, the fixing jig is locked to the notch. Thereby, a steel pipe is fixed to a cylinder part reliably and it can prevent easily that a main body moves relatively with respect to a steel pipe.

  Here, it is preferable that a cap (for example, caps 16 and 16A described later) is provided at the upper end of the steel pipe.

  According to this invention, since the cap is attached to the upper end of the steel pipe, it is possible to prevent the salt content such as the splash of seawater from entering the inside of the steel pipe, and to suppress the progress of corrosion inside the steel pipe.

  Moreover, it is preferable that a sealing agent (for example, a sealing agent S described later) is filled between the outer surface of the steel pipe and the inner surface of the cylindrical portion.

  According to the present invention, since the sealing agent is filled between the outer surface of the steel pipe and the inner surface of the cylindrical portion, salt content such as seawater splash is prevented from adhering to the outer surface of the steel pipe, and the corrosion of the steel pipe is progressed. Can be suppressed.

  According to the present invention, a steel pipe is inserted into a cylindrical portion provided in the main body, and at least a part of the steel pipe is driven into the ground to function as a pile. At this time, since the steel pipe is fixed to the cylindrical portion, even if a pulling force or a pushing force acts on the main body, the main body can be prevented from moving relative to the steel pipe. Therefore, the supporting force by the steel pipe can be reliably transmitted to the main body even in soft ground.

It is a perspective view of the foundation structure concerning a 1st embodiment of the present invention. It is a top view of the foundation structure concerning the embodiment. It is a perspective view of the jig for foundations of the foundation structure concerning the embodiment. It is a top view of the jig for foundations concerning the embodiment. It is AA sectional drawing of FIG. It is an expanded sectional view of the cylinder part of the jig for foundations concerning the embodiment. It is a figure which shows the experimental result of the Example and comparative example of this invention. It is an expanded sectional view of the cylinder part of the foundation structure concerning a 2nd embodiment of the present invention. It is an expanded sectional view of the cylinder part of the foundation structure concerning 3rd Embodiment of this invention. It is an expanded sectional view of the cylinder part of the foundation structure concerning a 4th embodiment of the present invention. It is an expanded sectional view of the cylinder part of the foundation structure concerning a 5th embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a perspective view of a foundation structure 1 according to the first embodiment of the present invention. FIG. 2 is a plan view of the foundation structure 1.
The foundation structure 1 supports the structure 2 at the upper part. The foundation structure 1 includes a foundation jig 10 and four steel pipes 20 fixed to the foundation jig 10.

3 and 4 are a perspective view and a plan view of the foundation jig 10. 5 is a cross-sectional view taken along the line AA in FIG.
The foundation jig 10 is a casting made of ductile cast iron, and has a bowl-shaped main body 11, four cylindrical cylindrical portions 12 provided in the main body 11 and through which the steel pipe 20 is inserted, and the cylindrical portions 12. And a bolt 30 as a fixing jig for fixing the steel pipe 20. Two bolts 30 are provided for one cylindrical portion.
In the present embodiment, the foundation jig 10 is cast. However, the present invention is not limited to this, and the foundation jig may be made of concrete or plastic.

The main body 11 has a rectangular shape in plan view, and is disposed on the ground surface 3 so that the central axis is substantially vertical (see FIG. 5). The main body 11 has a saddle shape, that is, a shape in which the central portion bulges upward, and leg portions 13 protruding downward are formed at the four corners of the main body 11.
Further, a through hole 14 for connecting the structure 2 to the main body 11 is formed in the central portion of the main body 11.

  The four cylindrical portions 12 are cylindrical and are provided integrally with the main body 11 at the four corners of the main body 11. The central axes of the four cylindrical portions 12 are inclined with respect to the axial direction of the main body 11 and interfere with each other. It extends without.

  Each of the four steel pipes 20 has a cylindrical shape and is inserted through the cylindrical portion 12. In the state in which the main body 11 is installed on the ground surface 3, these steel pipes 20 are at least partially driven into the ground and function as piles.

FIG. 6 is an enlarged cross-sectional view of the cylindrical portion 12. In FIG. 6, for easy understanding, the axial direction of the cylindrical portion 12 is expressed as a vertical direction.
The steel pipe 20 is exposed from the upper end of the cylindrical portion 12. Here, a portion of the steel pipe 20 that is located inside the cylindrical portion 12 and is fixed to the cylindrical portion 12 is defined as a fixed portion 21, and a portion that is exposed from the upper end of the cylindrical portion 12 above the fixed portion 21 is exposed. Part 22 is assumed.

On the upper end side of the cylindrical portion 12, a screw hole 15 that penetrates the cylindrical portion 12 and is formed with a female screw is provided. A bolt 30 is screwed into the screw hole 15.
The exposed portion 22 of the steel pipe 20 is covered with a cap 16 that covers the outer surface of the exposed portion 22.

Sealing agent S is filled in the gap between the outer surface of fixing portion 21 and the inner surface of cylinder portion 12 and the gap between the outer surface of exposed portion 22 and the inner surface of the cap.
A sealing agent S is also applied to the inner surface of the fixed portion 21, and the lower end of the fixed portion 21 is closed with a sponge 23.

  In the foundation jig 10 described above, the bolt 30 is screwed into the screw hole 15 and tightened, whereby the outer surface of the steel pipe 20 is pressed with the tip of the bolt and the outer surface of the steel pipe 20 is pressed against the inner surface of the cylindrical portion 12. . Thereby, the steel pipe 20 is fixed to the cylinder part 12.

  In the following, three types of experiments were carried out for the case where the steel pipe was fixed (Example) and the case where the steel pipe was not fixed (Comparative Example): push-in force, pull-out force, and horizontal load. In each example, the length of the steel pipe was 4 m.

  FIG. 7 is a diagram showing the experimental results of Examples and Comparative Examples. In FIG. 7, (a) shows the relationship between the pushing force and the pushing amount (sinking amount), and (b) shows the relationship between the drawing force and the drawing amount (lifting amount). ) Shows the relationship between the horizontal load and the horizontal movement amount (horizontal displacement amount).

  From the experimental results shown in FIG. 7, it can be seen that the displacement amount of the example is significantly reduced compared to the comparative example at any load below the design load in any experiment.

According to this embodiment, there are the following effects.
(1) Since the steel pipe 20 is fixed to the cylindrical portion 12, it is possible to prevent the main body 11 from moving relative to the steel pipe 20 even if a pulling force or a pushing force acts on the main body 11. Therefore, the supporting force by the steel pipe 20 can be reliably transmitted to the main body 11 even in soft ground.

  (2) By screwing the bolt 30 into the screw hole 15 and tightening, the steel pipe 20 can be securely fixed to the cylindrical portion 12 and the main body 11 can be easily prevented from moving relative to the steel pipe 20.

  (3) Since the cap 16 is attached to the upper end of the steel pipe 20, salt content such as seawater splash can be prevented from entering the steel pipe 20, and the progress of corrosion inside the steel pipe 20 can be suppressed.

  (4) Since the sealing agent S is filled between the outer surface of the steel pipe 20 and the inner surface of the cylindrical portion 12, salt content such as seawater splash is prevented from adhering to the outer surface of the steel pipe 20, and corrosion of the steel pipe 20 is prevented. Progress can be suppressed.

[Second Embodiment]
FIG. 8 is an enlarged cross-sectional view of the cylindrical portion 12A of the foundation jig 10A according to the second embodiment of the present invention.
In the present embodiment, the structure of the steel pipe 20A, the cylindrical portion 12A, and the hairpin 30A as a fixing jig is different from that of the first embodiment.
That is, unlike the steel pipe 20 of the first embodiment, the steel pipe 20A is not exposed from the upper end of the cylindrical portion 12, and the cap 16A that covers the upper end of the steel pipe 20A is put on the upper end of the steel pipe 20A.

Moreover, the 1st through-holes 17 and 24 are formed in the predetermined position A of the cylinder part 12A and the steel pipe 20A. Moreover, the 2nd through-holes 18 and 25 are formed in the position B which opposes the predetermined position A of the cylinder part 12A and the steel pipe 20A.
The hairpin 30A is inserted through the through holes 17, 18, 24, 25.

  In the basic jig 10A described above, the pin 30A is inserted into the through holes 17, 18, 24, 25 so that the pin 30A is engaged with the through holes 17, 18, 24, 25 of the cylindrical portion 12A and the steel pipe 20A. Stop. Thereby, steel pipe 20A is fixed to cylinder part 12A.

According to this embodiment, in addition to the effects (1), (3), and (4) described above, the following effects can be obtained.
(5) By inserting the pin 30A into the through holes 17, 18, 24, 25, the steel pipe 20A is securely fixed to the cylindrical portion 12A, and the main body 11 can easily move relative to the steel pipe 20A. Can be prevented.

[Third Embodiment]
FIG. 9 is an enlarged cross-sectional view of the cylindrical portion 12B of the foundation jig 10B according to the third embodiment of the present invention.
In the present embodiment, the structures of the steel pipe 20B, the cylindrical portion 12B, and the fixing jig 30B are different from those in the first embodiment.
The first through holes 17 and 24 and the second through holes 18 and 25 are formed in the tube portion 12B and the steel pipe 20B, similarly to the tube portion 12A and the steel pipe 20A of the second embodiment.

  Further, the upper end of the exposed portion 22 of the steel pipe 20B is covered with a cap 16A that covers the upper end of the steel pipe 20B.

  The fixing jig 30 </ b> B is inserted through the through holes 17, 18, 24, and 25. The fixing jig 30B includes a cylindrical first locking portion 31 inserted through the first through holes 17 and 24, and a cylindrical second locking portion 32 inserted through the second through holes 18 and 25. And a biasing portion 33 that biases the first locking portion 31 and the second locking portion 32 in directions away from each other.

  In the foundation jig 10B described above, the fixing jig 30B is inserted into the steel pipe 20B, the first locking portion 31 of the fixing jig 30B is inserted into the first through holes 17, 24, and the second The locking portion 32 is inserted into the second through holes 18 and 25. Then, these latching | locking parts 31 and 32 are urged | biased from the inner side to the outer side by the urging | biasing part 33, and latch to the through-holes 17, 18, 24, and 25 of the cylinder part 12B and the steel pipe 20B. Thereby, the steel pipe 20B is fixed to the cylinder part 12B.

According to this embodiment, in addition to the effects (1), (3), and (4) described above, the following effects can be obtained.
(6) By inserting the fixing jig 30B into the steel pipe 20B and locking the locking portions 31, 32 of the fixing jig 30B to the through holes 17, 18, 24, 25, the steel pipe 20B becomes the cylindrical portion. It is securely fixed to 12B, and the main body 11 can be easily prevented from moving relative to the steel pipe 20B.

[Fourth Embodiment]
FIG. 10 is an enlarged cross-sectional view of the cylindrical portion 12C of the foundation jig 10C according to the fourth embodiment of the present invention.
In the present embodiment, the structures of the steel pipe 20C, the cylinder portion 12C, and the fixing jig 30C are different from those in the first embodiment.

  That is, the through-hole is not provided in the cylinder portion 12C and the steel pipe 20C. Further, the upper end of the exposed portion 22 of the steel pipe 20B is covered with a cap 16A that covers the upper end of the steel pipe 20C.

The fixing jig 30C has a cylindrical shape that covers the fixing portion 21 of the steel pipe 20C, and slits 34 that extend vertically are provided at a plurality of locations on the upper end side.
The thickness of the fixing jig 30C increases from the distal end side to the proximal end side (that is, from the lower end side to the upper end side) of the steel pipe 20C.

  In the basic jig 10C described above, the fixing jig 30C is attached to the steel pipe 20C, and in this state, the steel pipe 20C is inserted into the cylindrical portion 12C. At this time, as the fixing jig 30C enters the inside of the cylindrical portion 12C, the fixing jig 30C enters the gap between the outer surface of the steel pipe 20C and the inner surface of the cylindrical portion 12C, so that the steel pipe 20C is fixed to the cylindrical portion 12C. The

According to this embodiment, in addition to the effects (1), (3), and (4) described above, the following effects can be obtained.
(7) The fixing jig 30C is attached to the steel pipe 20C, and in this state, the steel pipe 20C is inserted into the cylindrical portion 12C, so that the steel pipe 20C is securely fixed to the cylindrical portion 12C, and the main body 11 is attached to the steel pipe 20C. Therefore, relative movement can be easily prevented.

[Fifth Embodiment]
FIG. 11 is an enlarged cross-sectional view of the cylindrical portion 12D of the foundation jig 10D according to the fifth embodiment of the present invention.
In the present embodiment, the structures of the steel pipe 20D, the cylinder portion 12D, and the fixing jig 30D are different from those in the first embodiment.

That is, similarly to the steel pipe 20C of the fourth embodiment, the steel pipe 20D is not provided with a through hole.
A notch portion 19 is formed in the cylindrical portion 12D, and a part of the steel pipe 20D is exposed.
Further, the upper end of the exposed portion 22 of the steel pipe 20D is covered with a cap 16A that covers the upper end of the steel pipe 20D.

  The fixing jig 30D is attached to a portion exposed from the notch portion 19 of the steel pipe 20D. The fixing jig 30D includes an annular band 35 that is disposed around the steel pipe 20D and is partially cut off, and a fastening jig 36 that tightens the steel pipe 20D by bringing both ends of the band 35 close to each other.

  Through-holes (not shown) are formed at both ends of the band 35, and the tightening jig 36 includes a bolt inserted into the through-hole and a nut screwed into the bolt.

  In the basic jig 10D described above, when the steel pipe 20D is inserted into the cylindrical part 12D, a part of the steel pipe 20D is exposed from the notch part 19. In this state, when the fixing jig 30D is attached to the exposed portion of the steel pipe 20D, the fixing jig 30D is locked to the notch portion, and the steel pipe 20D is fixed to the cylindrical portion 12D.

According to this embodiment, in addition to the effects (1), (3), and (4) described above, the following effects can be obtained.
(8) When the fixing jig 30D is attached to the exposed portion of the steel pipe 20D, the fixing jig 30D is locked to the notch. Thereby, steel pipe 20D is fixed to cylinder part 12D reliably, and it can prevent easily that main part 11 moves relative to steel pipe 20D.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the first embodiment described above, the fixing jig is the bolt 30, but the fixing jig is not limited thereto, and the fixing jig may be a screw or a saddle screw.

  In each embodiment, the outer surface and inner surface of the fixing portion 21 are filled or coated with the sealing agent S, or the lower end of the fixing portion 21 is closed with the sponge 23. However, the present invention is not limited to this. 23 may be omitted as appropriate.

Moreover, in order to prevent corrosion of the steel pipes 20 to 20D, mortar or concrete may be placed so as to cover the cylindrical portions 12 to 12D.
In addition, the steel pipes 20 to 20D may be subjected to hot dip galvanization, hot dip aluminum plating, or hot dip plating with other base resistant metals in order to prevent corrosion.
Moreover, the thickness of the steel pipes 20 to 20D may be appropriately set in consideration of the corrosion rate of the steel pipe.

A ... Predetermined position B ... Position facing the predetermined position S ... Sealing agent 1 ... Foundation structure 2 ... Structure 3 ... Ground surface 10, 10A, 10B, 10C, 10D ... Jig for foundation 11 ... Main body 12, 12A, 12B , 12C, 12D ... cylindrical portion 13 ... leg portion 14 ... through hole 15 ... screw hole 16, 16A ... cap 17 ... first through hole 18 ... second through hole 19 ... notch 20, 20A, 20B, 20C, 20D ... Steel pipe 21 ... Fixing part 22 ... Exposed part 23 ... Sponge 24 ... First through hole 25 ... Second through hole 30 ... Bolt (fixing jig)
30A ... Hairpin (fixing jig)
30B, 30C, 30D ... Fixing jig 31 ... First locking part 32 ... Second locking part 33 ... Biasing part 34 ... Slit 35 ... Band 36 ... Tightening jig

Claims (1)

A foundation jig, and four steel pipes fixed to the foundation jig,
The foundation jig includes a main body, four cylindrical cylindrical portions that are provided in the main body and through which the steel pipe is inserted, and a fixing jig that fixes the steel pipe to the cylindrical portion,
The central axes of the four cylindrical portions are inclined with respect to the axial direction of the main body and extend without interfering with each other,
The four steel pipes are at least partially driven into the ground ,
A first through hole is formed at a predetermined position of the cylindrical portion and the steel pipe,
A second through hole is formed at a position facing the predetermined position of the tubular portion and the steel pipe,
The fixing jig includes a first locking portion that is inserted through the first through hole, a second locking portion that is inserted through the second through hole, the first locking portion, and the second locking portion. And a biasing portion that curves upward and biases the first locking portion and the second locking portion away from each other.

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