JP3409678B2 - Manufacturing method of screwed steel pipe pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw
For steel pipe piles, more specifically,
Steel pipe using a thick or strong mounting member
The pile can be buried underground with no soil removal by applying rotational force.
Screwed steel pipe piles. [0002] 2. Description of the Related Art A wing plate is attached to the tip or side of a steel pipe.
A rotating force is applied to the steel pipe pile by a machine installed on the ground,
The conventional method of burying steel pipe piles underground by the action of
Have been proposed, some of which are targeted at small diameter piles.
It has been put to practical use. Here, the present invention
The following describes three inventions that are believed to be related to
I do. [0003] Japanese Patent Publication No. 2-62848 discloses
The method of burying steel pipe piles is to fix a bottom plate at the lower end of the steel pipe pile body.
The bottom plate is provided with a digging blade, and the lower end of the pile body is
Wingspan with an outer diameter almost twice the outer diameter of the pile body on the outer peripheral surface
Helical wing for screwing large piles over almost one turn
Rotate the projecting steel pipe pile so that it is screwed into the soft ground.
While pushing into the ground, and the tip of the pile body
Excavated and softened, and spiraled into the unexcavated sediment on the side of the pile
Engage the wings and rotate the pile using the soil resistance as the reaction force.
Extruding and softening the excavated softened sand to the side of the pile while moving
And screwed the pile into the ground without earth removal.
(Prior Art 1). [0004] Further, Japanese Patent Application Laid-Open No. 7-292666 describes this.
The loaded steel pipe pile has a length of half a roll and an outer diameter of
A pair of spiral wings, which is about 1.5 to 3 times the body,
At the same height on the outer peripheral surface of the lower end of the
Are fixed to each other discontinuously relative to each other
(Prior art 2). Further, Japanese Patent Application Laid-Open No. 61-98818 discloses
The described rotary press-fit steel pipe pile is located at the bottom of the steel cylinder,
Providing a blade with a sloping front face for pushing extending in the vertical direction
And from the lower end of the inclined front surface in the cylinder rotation direction
Fix the inclined blade that rises obliquely toward
Of the drill head, at the upper end of the drill head
The lower end of a steel pipe pile is attached (Prior Art 3).
Spiral wing or inclined blade shown in these prior arts 1 to 3
Function as screws during construction and
It also has a function as a support for obtaining panel reaction force. [0006] The steels of prior arts 1 and 2
After the construction is completed, the pipe piles
When a vertical force acts on the pipe pile, the spiral wings
Receives strong reaction force. As a result, a large
A large bending moment, which is transmitted to the steel pipe and
High bending stress occurs. This bending stress is equal to that of the prior art 2.
As described in the specification, the outer diameter of the steel pipe is 100
Large for practical use with steel pipe piles with a small diameter of about 200 mm
It doesn't matter. However, widely used
For steel pipe piles with an outer diameter of 500 to 600 mm, the design is large.
Problem. The outer diameter of the spiral wing is shown in prior arts 1 and 2.
The outer diameter of the steel pipe is 2
It is said to be about twice as good. Here, the outer diameter of the steel pipe is 20
Compare 0mm steel pipe pile and 600mm steel pipe pile. Right now
The outer diameter of each spiral blade is 40 times the outer diameter of the steel pipe.
Assuming 0 mm and 1200 mm, the width of the spiral wing,
Outer diameter-outer diameter of steel pipe) / 2 are 100 mm and 300 mm, respectively.
Becomes The ground reaction force per unit area acting on the spiral wing is the same.
In other words, per unit circumference acting on the root of the spiral wing
Since the bending moment is proportional to the square of the width of the spiral wing,
About 600mm outside diameter steel pipe is about 200mm outside diameter compared to 200mm outside diameter steel pipe.
9 times larger. For this reason, spiral wings are very thick
Required. On the other hand, the steel pipe near the root of the spiral blade is
The bending moment is transmitted from the turning wing, and bending stress is generated.
You. The magnitude of the bending moment transmitted to the steel pipe is
Depending on the dimensions, the bending model generated at the root of the spiral wing
About 50 to 100% of the For example, an outer diameter of 600
Spiral that requires a thickness of 40 mm or more in the case of a steel pipe of mm
Bending moment about 50 to 100% of the wing bending moment
Acts on the steel pipe near the root of the spiral wing. Outer diameter 600
In the case of a steel pipe of mm, the wall thickness of the commonly used steel pipe is 5
About 12mm, bending of steel pipe caused by ground reaction
Shear stress greatly exceeds the design allowable bending stress of the above steel pipe
Will be. To cope with this, the wall thickness is
It is conceivable to use steel pipes up to 3 times
The strike becomes extremely large, making it impossible to design practically.
I can't get it. Further, the steel pipe pile of the prior art 3 is a steel cylindrical body.
Obtains large ground support because there is no lid at the tip
Have an important problem that can not be
The width of the blade is narrow, slightly inside and outside the tip of the steel cylinder.
Large ground support for inclined blades due to the structure projecting to the ground
Can not be expected as a supporter of power. The present invention has been made to solve the above problems.
Screwed steel pipe piles such asManufacturing method
The purpose is to obtain. (1)Materials can be used without waste, and the structure
But with less processing and lower costs
You. In addition, screw-type steel pipe piles with the following features are manufactured.
It is intended to build. (2) A large ground support force can be obtained using the wings. (3) Due to the bending moment transmitted from the wing, the steel pipe pile
Do not generate excessive stress on (4) Steel pipe piles can be buried by screwing into the strong ground
That. [0011] SUMMARY OF THE INVENTION A screw type according to the present invention.
The method of manufacturing steel pipe piles consists of a steel pipe and wings at the tip or outer peripheral surface.
And an attached mounting member.
Thickness greater than the thickness of the steel pipe or greater than the strength of the steel pipe
Parallelogram or trapezoidal steel plate by cutting high strength steel plate
The process of manufacturingThe parallelogram or trapezoidal shapeSteel sheet
CylindricalBendingWelded joints at both endsTo do
So at the endManufactures a mounting member with a substantially U-shaped mounting part.
Making, and attaching a wing to the attachment portion,
Either the lower end of the steel pipe or the mounting member is inserted into the other.
And joining them together. [0012] [0013] DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the steel pipe pile wings
Wings must have high rigidity to receive large ground reaction
Required. For example, if the outer diameter of the steel pipe is 500 mm and the outer diameter of the wing is
In the case of 1000 mm, the wing has large bending
Due to the design of the steel, the steel
Plate is required and this bending moment is
And a large bending stress is generated. Above bending mode
The size of the element depends on the relationship between the outer diameter of the steel
Depending on the distribution of panel reaction force, the inner and outer wings of the steel pipe
Large imbalance in applied bending moment
This is transmitted to the steel pipe, and as shown in FIG.
Large bending moment can be transmitted to
You. The present invention is affected by the bending stress of the steel pipe pile.
Steel plate with a thickness greater than the wall thickness of the steel pipe or the strength of the steel pipe.
Use mounting members made of steel
Generated in parts affected by bending stress
In this case, the applied stress is kept within the allowable stress.
Hereinafter, embodiments of the present invention will be described. [First Embodiment] FIG. 1 shows a first embodiment of the present invention.
It is a perspective view of the screw type steel pipe pile which concerns on. In the figure,
1 is a screw-in type steel pipe pile (hereinafter simply referred to as a steel pipe pile), 2
Is a steel pipe constituting the steel pipe pile 1, and 3 is a wing 10 at the lower end.
Steel wings 11a and 11b are attached to the lower end of the steel pipe 2.
Parts are fitted and joined to form a steel pipe pile 1 together with a steel pipe 2
It is a mounting member. The mounting member 3 has a thickness t of the steel pipe 2.₁Thicker
Sheet thickness t_TwoAnd its width (or length) is smaller than the outer peripheral length of the steel pipe 2.
Or longer steel plate, or its width is greater than the strength of steel pipe 2
(Or length) is steeltubeFig. 2 shows a steel plate slightly longer than the circumference of Fig. 2.
As shown in the figure, a parallelogram-shaped steel plate 7a cut diagonally
To produce And, as shown by the arrow,
Bend to form a cylinder, weld both ends
This is configured as shown in FIG. This allows
At the upper and lower ends of the mounting member 3, the pitch P of the spiral virtual line
The substantially stepped (spiral) wing 1 is provided by the corresponding step portion 5.
A mounting portion 4 of zero is formed. In this case, of the mounting members 3
Diameter D_TwoIs substantially equal to or slightly larger than the outer diameter D of the steel pipe 2.
It is formed well. FIG. 4 shows a steel plate 7b cut into a trapezoidal shape shown in FIG.
To form a cylindrical mounting member 3 by bending
A spiral mounting portion 4 having a pitch P is formed at a lower end portion.
The ends are almost horizontal. The mounting member 3 is configured
Steel plates are limited to parallelograms or trapezoids.
However, any rectangular shape, such as a rectangular shape, may be used. In this case, the pin formed by the step 5
Switch P indicates the state of the ground in which the steel pipe pile 1 is buried,
Although it varies depending on the diameter D, etc., generally P = 0.1 to 0.6.
D (D is the outer diameter of the steel pipe 2).
The same applies to the following embodiments.) This pitch P
Is less than 0.1, the penetration amount of steel pipe pile 1 per rotation is
If it exceeds 0.6D, the amount of penetration per rotation
To rotate the steel pipe pile 1
Luk became excessive, and excavated with steel wings 11a and 11b
Support depth may be reduced
You. The thickness t of the mounting member 3_TwoAnd its length L is
Determined by numerical analysis taking into account assumed ground reaction force
Will do. First, the thickness t_TwoSee, for example,
For example, the outer diameter D of the steel pipe 2 is 500 mm, and the diameter D of the blade 10 is_FourIs 1
When a vertical load of 500t is applied at 000mm,
In the case of steel pipes, the part where only axial force acts is 14mm thick
Yield stress (2400kgf / cm^Two) Where the axis fits
Allows stress where both forces and bending moments act
A steel pipe with a thickness of about 20 mm is required
And For this reason, the wing 10 is directly
The method of attaching to a steel pipe is uneconomical. Therefore, as described above, the bending moment
The thickness t of the steel pipe 2 is₁Thicker wall thickness t_TwoTake
Attachment member 3 or attachment member having strength greater than the strength of steel pipe 2
If it is used, it is not necessary to increase the entire thickness of the steel pipe 2.
Therefore, it is economical and has a large bending moment.
Will be able to respond in minutes. The mounting member 3 is as described above.
Weld a steel plate that has been cut into almost strips.
Only, so use various sizes corresponding to the applied load
Can be. Next, the length L of the mounting member 3 is determined by the inventors.
According to the conducted FEM analysis, it depends on the ground reaction force
However, in general, 0.3D (D is the outer diameter of the steel pipe 2) or more
(The same applies to each of the following embodiments.
). In the above description, a substantially strip-shaped steel plate is bent.
Although the case where the mounting member 3 is manufactured by processing is shown,
The outer diameter of the steel pipe 2 is almost equal to or slightly larger than that of the steel pipe 2.
A steel pipe thicker than the wall thickness of the pipe 2 or a strength greater than the strength of the steel pipe 2
A steel pipe is cut to a predetermined length L and its lower end is pitched.
P is cut into a spiral shape, and the structure shown in FIG.
An attachment member may be configured. The wing 10 has an outer diameter D as shown in FIG._Fourof
Circular steel plate 11 or elliptical steel plate is divided into two from the center and flat
Steel wings 11a and 11b are formed and straight edges are
It is placed on a line passing through the center from the step portion 5 of the attachment portion 4 of the attachment member 3.
To the mounting part 4 by welding, and
It is a spiral configuration. In this case, the tip of the mounting member 3
At the ends, the straight edges of the steel wings 11a, 11b
May be closed by the closing member.
No. The outer diameter D of the wing 10_FourIs generally the outer diameter of the steel pipe 2
It is desirable that D is about 1.5 to 3.0 times (the following embodiments)
The same applies to the state). In this embodiment, the sum of the internal angles is
Wing 10 is formed by two 360 ° steel wings 11a and 11b.
The configuration is shown, but the circular steel plate 11 is divided into three equal parts, four equal parts, etc.
Then, a plurality of steel wings with a total inner angle of 360 ° were
The tip of the mounting member 3 so as to form a substantially spiral shape as a body
The wing 10 may be configured by attaching to the section. Large number of steel wings
It is almost spiral, but in actual construction, it is 4
It is enough if the number is too large.
Function and the wing mounting structure becomes unstable.
This is uneconomical because it only increases the installation time. In this embodiment, a steel wing 1 is provided at the lower end.
From above, in the mounting member 3 to which 1a and 11b are mounted.
The lower end of the steel pipe 2 is fitted to a predetermined position,
The upper edge and the outer peripheral surface of the steel pipe 2 are welded and joined together to form a steel pipe.
The pile 1 is configured. In this case, the connection between the mounting member 3 and the steel pipe 2 is performed.
At the time of fitting, the steel pipe 2 is fitted into the mounting member 3.
The upper edge of the mounting member 3 and the steel pipe.
Can be welded easily and securely.
it can. The outer peripheral surface of the steel pipe 2 or the inner peripheral surface of the mounting member 3
Next, a positioning slot for fitting the steel pipe 2 into the mounting member 3 will be described.
Providing a topper makes it more reliable to transmit the vertical load to the tip.
Can do it. Further, the steel wing 11 is attached to the mounting member 3.
Before attaching a and 11b, join the mounting member 3 and the steel pipe 2 together.
If done, the upper edge of the mounting member 3 and the outer peripheral surface of the steel pipe 2
Welding of inner peripheral surface or lower edge of attachment member 3 and lower end of steel pipe 2
Thus, they can be surely integrated. When the steel pipe pile 1 is buried, it is shown in FIG.
As shown in FIG.
Connected to the device 31 and drive the rotary drive device 31 to drive the steel pipe pile
1 is rotated and propelled into the ground by the screw action of the wing 10.
And buried. At this time, the tip opening (
Accordingly, most of the opening (tip opening) of the mounting member 3 is the steel wing 1
1a, 11b, the soil is
Sand hardly penetrates. According to the present embodiment configured as described above,
For example, both functions of closing the tip opening of the steel pipe pile 1 and the propulsion wing
Steel wings 11a and 11b provided by
Functions as a support when a direct force is applied, and has a large ground support force
Can be obtained. In addition, it occurs on the wing 10 of the steel pipe pile 1.
Mounting member 3 is provided at the part where bending moment is transmitted
Therefore, the bending stress generated in the mounting member 3 was kept within the allowable value.
The bending mode generated by the wing 10 on the steel pipe pile 1
No comment is transmitted. Further, the mounting member 3
By using the steel pipe, it is possible to use a steel pipe 2 having a normal thickness.
Also, the mounting member 3 has a small number of processed parts and is manufactured without waste.
As a result, the cost can be reduced. [Embodiment 2] FIG. 8 shows Embodiment 2 of the present invention.
It is a perspective view of. In the first embodiment, the outer diameter D of the steel pipe 2 is
Inner or slightly larger inner diameter D_TwoUse mounting member 3
When the steel pipe 2 is inserted into the mounting member 3 and welded.
However, in the present embodiment, the inner diameter D of the steel pipe 2 is₁And almost equal
Outer diameter D_ThreeMounting member 3
The steel pipe 2 is fitted around the outer periphery of the mounting member 3
The steel pipe pile 1 is formed by welding the edge and the outer peripheral surface of the mounting member 3.
It is a thing. The operation and effect of this embodiment are the same as those of the first embodiment.
The description is omitted because it is the same as the case. [Embodiment 3] Next, each of Embodiments 1 and 2
A description will be given of various modifications. FIG. 9 shows a first modification.
FIG. 3 is a perspective view showing the state where steel wings 11 a and 11
b. The attachment member 3 is shown in FIGS.
As shown in FIG. 1 (FIG.
), Slightly longer than the outer circumference of the steel pipe 2 (or
One length of the rectangular steel plate 8 (slightly shorter than the inner circumference of the pipe 2)
The center part of the side is set to a half of the pitch P of the above spiral virtual line.
1 is formed as a stepped portion 5b having a sawtooth shape.
Is bent to form a cylindrical shape as shown in FIG.
Formed at the lower end of the C-shaped two mounting portions 4a, 4b
Things. Note that the ends of the two rectangular steel plates are
After joining them, they are bent into a cylindrical shape and
The attachment portions 4a and 4b in the shape of a letter may be formed. Also, steel plate
8 may be a parallelogram or trapezoid, and
The attachment member 3 may be configured by cutting the end into a saw-tooth shape. The mounting portions 4a, 4b of the mounting member 3 as described above
The steel wings 11a and 11b as shown in FIG.
If the steel pipe 2 is fitted to the mounting member 3, the steel pipe pile 1 is
Be composed. The operation and effect of this modification are the same as those of the first and second embodiments.
It is almost the same as the case. FIG. 12 is a perspective view of a second modified example, in which
At the lower end of the material 3, there are square steel wings 21a and 21b.
A wing 10 is provided. In addition, the mounting member 3 is an embodiment type.
An example is shown in which the same mounting member 3 as in the first and second embodiments is used.
is there. The wing 10 has, for example, four wings as shown in FIG.
Square steel wing 2 obtained by dividing a square steel plate 21 into two parts from the center
1a, 21b, very simple structure
It is. Then, the steel wings 21a and 21b were combined.
The size is the condition of the ground where the steel pipe pile 1 is buried,
Generally, the outer diameter D of the steel pipe 2 varies depending on the diameter or the like.
It is desirably about 1.5 to 3.0 times. Here, the steel wing 21
The sizes of a and 21b are the diagonal of the steel plate 21 shown in FIG.
Refers to the length L of the line. The steel wings 21a and 21b are
A rectangular steel plate may be divided into two parts. Operation and effect of the steel pipe pile with wings 1 according to this modification.
The results are almost the same as those in the above-described embodiments.
In the embodiment, when the steel pipe pile 1 penetrates the ground,
The side of the sand excavation in the rotation direction is the angle of the steel wings 21a and 21b.
(The largest size part), so the tip surface
The rear side of the vehicle tends to move away from the excavated ground.
That is, the steel wings 21a and 21b escape behind the excavated portion.
Having a surface. For this reason, the side face behind the excavation part was excavated
Steel pipe pile with arcuate wings in constant contact with the ground wall
The frictional resistance at the time of penetration can be reduced as compared with. FIG. 14 shows another example of this modification.
In this example, instead of the square steel wings 21a and 21b,
Triangular steel cut into two pieces by cutting a square steel plate diagonally
Wings 21c and 21d are attached to the tip of attachment member 3.
It is. The function of this example is almost the same as that of the example of FIG.
is there. FIG. 15 shows still another example of this modification.
Therefore, in this example, the steel wings 21e and 21f are made of hexagonal steel plates.
It is configured by dividing into two parts. The function of this example is also shown in FIG.
Approximately the same as in the example, except that the wings 10
The bearing capacity characteristics compared to a square steel wing
Is improved. In the above description, a triangle, a square or a hexagon
Steel wings 21a to 21f were formed by dividing a shaped steel plate into two.
Although the case was shown, for example, a polygonal steel plate of octagon or more
The steel wing may be configured by dividing into two. Also, the above explanation
Then, when a polygonal steel plate is divided into two to form a steel wing
However, steel wings were divided into three or more parts,
To the three or more mounting parts provided at the tip of the mounting member 3.
You may make it attach next. FIG. 16 is a perspective view of a third modification. Book
In the example, a square steel pipe 2a is used for the steel pipe, and the mounting member 3 is used.
Is a square. In making the mounting member 3
In other words, for example, four rectangular steel plates or slanted lower ends
Is an L-shaped steel plate welded in a square shape and screwed almost at the lower end.
A spiral attachment portion 4a is formed. Note that this deformation
The size D of the square steel pipe 2a in the example (in the first embodiment,
Corresponds to the outer diameter of the steel pipe 2).
Say. The function and effect of the steel pipe pile 1 according to this modification are also described above.
It is almost the same as in each embodiment, except that the steel pipe 2
In the case of a steel pipe pile 1 made of steel pipe (round shape),
Then, since the entire peripheral surface of the steel pipe 2 is in sliding contact with the ground, peripheral surface friction is reduced.
Large and requires large torque. On the other hand, the corner
When it is composed of a shaped steel pipe 2a, the main
The corners of the square steel pipe 2a come into contact with the surrounding ground,
Low surface friction, which reduces screwing torque
Can be. FIG. 17 is a perspective view of a fourth modification, in which a steel pipe pile is shown.
1 comprises a ribbed steel pipe 2b. Sand
That is, a plurality of ribs 2c are provided on the surface by, for example, rolling.
The bent steel plate is bent, and a spiral rib 2c is formed on the outer peripheral surface.
It is formed. The pitch P of the rib 2c is as described above.
The pitch P of the spiral virtual line of the first embodiment
ing. In this case, the mounting member 3 includes the first or second embodiment.
The mounting member 3 described in the above is used. The operation and effect of this modified example are the same as those of the above embodiments.
It is almost the same as the case, but when screwing into the ground
Spiral ribs 2c also contribute to propulsion, improving propulsion
Can be done. In the first and second embodiments, the circular steel plate or
Oval steel plate is divided into several equal parts, and the sum of inner angles is 360 °
The wings 11a and 11b are formed, and this is
The case where the wing 10 is configured by attaching to the
Calculates the sum of the internal angles of the steel wings 11a and 11b from 360 °.
It is formed smaller or larger than 360 °.
18 and 19 show a fifth modification, in which the steel wing 1
The sum of the inner angles of 1a and 11b is smaller than 360 °
There is a gap 13 between the wings 11a and 11b
is there. 20 and 21 show the steel wings 11a and 11b.
The sum of the internal angles is larger than 360 °, and the steel wing 11
An overlap 14 occurs between a and 11b. Note that this
In the case, for example, when attaching the steel wing 11b,
5, a groove 4 c continuous with the mounting portion 4 is provided.
A part of the steel plate 11b may be fitted into the groove 4c. Field tests and numerical analysis performed by the inventors
According to the results of the study by the authors, the steel wing 11
If the sum of the interior angles of a and 11b is less than 320 °,
The penetration speed at the time of screwing in 1 decreases, and
The tip support force after installation decreases. More than 400 °
In a large-grained gravel ground, gravel is clogged between the wings 10.
The workability was found to be poor. Like this
The total of the inner angles of the steel wings 11a and 11b constituting the wing 10
It is desirable that the sum be in the range of 320 ° to 400 °.
No. In this case, each steel wing 11 constituting the wing 10
It is not necessary to make all interior angles of a and 11b equal,
May be different. Also, the gap 13 or the overlap 14 is set to 1
It is not necessary to concentrate on the place, the adjacent steel wings 11a, 1
1b may be provided as appropriate. Furthermore, steel wings 11a,
11b is not limited to two, but may be three or more.
(This embodiment can be implemented in other embodiments.
). [Embodiment 4] FIG. 22 shows an embodiment of the present invention.
4 is a perspective view of FIG. In this embodiment, the upper and lower ends are substantially flat.
The closing member 15 is attached to the distal end of the cylindrical mounting member 3a.
Attachment and wings made of steel wings 12a and 12b on the outer periphery
10 is provided. The inner diameter of the mounting member 3a is
Almost equal to or slightly larger than the outer diameter of the steel pipe 2, or
Its outer diameter is almost equal to or slightly smaller than the inner diameter of the steel pipe
A steel pipe having a thickness greater than the thickness of the steel pipe 2
Constructed by cutting steel pipe with strength greater than
Then, the closing member 15 is attached to the front end by welding.
The end opening is closed. In addition, the mounting member 3a
It may be manufactured by bending a steel plate. The wing 10 has an outer diameter D as shown in FIG.₆But
Larger than the outer diameter of the steel pipe 2 (for example, D₆= 2D), inner diameter D
_FiveIs a donut-shaped flat steel plate 12 having a diameter substantially equal to the outer diameter of the steel pipe 2.
Is divided into two parts from the center to form flat steel wings 12a and 12b.
The steel wings 12a and 12b are provided with mounting portions.
A spiral virtual line with a pitch P assumed on the outer peripheral surface of the material 3a
Along the entire spiral is attached by welding along
A wing 10 is formed. Then, a casing having wings 10 on the outer periphery is provided.
The steel pipe 2 is fitted or fitted to the attachment member 3a and joined by welding
By doing so, the steel pipe pile 1 is configured. In this embodiment, the sum of the internal angles is 360
The blade 10 is constituted by two steel blades 11a and 11b of
Is shown, the donut-shaped flat steel plate 11 is divided into three equal parts,
Divide into 4 equal parts, and the total number of inner angles is 320 ° to 400 °
Steel wings so that they form an almost spiral shape as a whole.
The wing 10 may be configured by being attached to the outer periphery of the attachment member 3a.
The more steel wings, the closer to the spiral shape, but the actual construction
In this case, 4 sheets is enough and the number of sheets will increase
If it breaks, the function as a screw will decrease and the wing mounting
It is uneconomical only because it becomes unstable in construction and increases installation time
It is. FIG. 24 shows another example of the present embodiment.
Then, the flat steel wings 12a and 12b shown in FIG.
On the outer peripheral surface of the attachment member 3a,
They are mounted at the same angle and in different directions. This implementation
Length L of mounting member 3a in form₁Is the fruit of the inventors
According to the applied FEM analysis, it depends on the ground reaction force
However, in general, it should be 0.7D (D is the outer diameter of the steel pipe 2) or more.
However, the mounting position of the wing 10 is
The tip of the mounting member 3a in terms of screwing work and supporting force performance
It is desirable that the distance is within 1D from the part. FIG. 22,
FIG. 24 shows a case where one stage of wings 10 is provided on the mounting member 3a.
However, two or more stages of wings 10 are installed.
You may ask. [Embodiment 5] FIG. 25 shows an embodiment of the present invention.
5, the mounting member 3 and the wings 10 provided on the mounting member 3 are:
This is the same as in the first embodiment. In the present embodiment, the wing 10
Above the outer peripheral surface of the steel pipe 2 as shown in FIG.
The flat steel wings 12a and 12b are
At almost the same angle as the wing 10 along the imaginary line, and different from each other.
Wing 20 (upper wing) attached in
You. The upper wing 20 is the same as the one shown in FIG.
Similarly, the steel wings 12a and 12b are moved along the spiral virtual line.
May be attached so as to form a spiral continuously. According to this embodiment, the steel pipe pile 1 is placed underground.
When screwing in, the upper stage wing 20 greatly contributes to propulsion.
To reduce the screwing torque
be able to. The upper wing 20 is provided in a plurality of stages on the steel pipe pile 1.
May also be implemented in other embodiments.
You. The upper wing 20 is provided above the steel pipe pile 1.
Therefore, the ground reaction force added to this is relatively small.
The step blade 20 can be directly attached to the steel pipe 2.
Depending on the position, ground condition, etc.
An attachment member may be provided. [Embodiment 6] The outer diameter of the steel pipe 2 is increased.
As described above, the outer diameter of the wing 10 also increases,
Therefore, the thickness of the wing 10 is also increased. As a result, for example, FIG.
The steel pipe pile 1 is screwed into the ground with a construction machine 30 as shown in FIG.
At this time, the ground side ends of the steel wings 11a, 11b, etc.
Large resistance is added by the panel, and rotation is impossible if the torque is weak
Sometimes it becomes impossible to penetrate the ground. For this reason,
The problem that the machine tool 30 must be enlarged
I will. This embodiment is to solve such a problem.
Into the wings 11a and 11b (rotational direction side)
End) is cut off at an acute angle to provide an inclined surface.
To reduce the resistance of the ground that is added to the part, making it easier to penetrate the ground
The torque is reduced. Note that the slope
Assists excavation in the cut-in portions of steel wings 11a and 11b
A digging blade may be attached. In addition, steel pipe pile 1
When screwed and buried underground, the steel wings 11a, 11b
In order to prevent the ends from being deformed, the steel wings 11a, 11
A reinforcing member may be attached to the bite portion such as b. Real truth
The embodiment can be implemented in other embodiments. In the above description, mounting on a mounting member or steel pipe
This figure shows the case where the girder wing is composed of multiple flat steel wings.
However, one or more bent along the spiral virtual line
It may be composed of spiral wings. [0051] The method for manufacturing the screw-in type steel pipe pile according to the present invention.
In the method, a steel sheet is cut into parallelograms or trapezoids
Make a steel plate ofThe parallelogram or trapezoidal shapeSteel sheet
CylindricalBendingWelded joints at both endsTo do
So at the endManufactures a mounting member with a substantially U-shaped mounting part.
So that the materials can be used without waste.
Cost, since the structure is simple and the processing is small.
Can be reduced. In addition, the manufacturing method of the present invention
Screwed steel pipe piles manufactured by
Thickness greater than wall thickness or strength greater than the strength of this steel pipe
A mounting member having a wing attached to a tip or an outer peripheral surface thereof.
The lower end of the steel pipe or one of the mounting members is the other
And joined together, so it can be
Large ground support force and a large bending moment from the wing
Even if it is transmitted, excessive stress is not transmitted to the steel pipe pile.
No. Also, either the steel pipe or the mounting member is inserted into the other
Since joining is performed, joining work is easy. Further
In addition, there is no need to increase the thickness of the entire steel pipe,
It is. [0052] [0053] [0054]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram for explaining the production of the mounting member of FIG. 1; FIG. 3 is a perspective view of the mounting member of FIG. 1; FIG. 4 is a perspective view of another example of a mounting member. FIG. 5 is an explanatory diagram of the wing of FIG. 1; FIG. 6 is an explanatory view of a construction example of a screw-in type steel pipe pile according to the present invention. FIG. 7 is an explanatory diagram of a stress distribution of a steel pipe due to a ground reaction force applied to a steel wing. FIG. 8 is a perspective view of Embodiment 2 of the present invention. FIG. 9 is an explanatory diagram of a first modification of the first and second embodiments according to the third embodiment of the present invention. FIG. 10 is a perspective view of the mounting member of FIG. 9; FIG. 11 is an explanatory diagram for explaining the production of the mounting member of FIG. 9; FIG. 12 is a perspective view of a second modified example. FIG. 13 is an explanatory view of the steel wing of FIG. FIG. 14 is a perspective view of another example of the second modified example. FIG. 15 is a perspective view of another example of the second modified example. FIG. 16 is a perspective view of a third modified example. FIG. 17 is a perspective view of a fourth modified example. FIG. 18 is a perspective view of a fifth modified example. FIG. 19 is a bottom view of FIG. 18; FIG. 20 is a perspective view of another example of the fifth modified example. FIG. 21 is a bottom view of FIG. 20; FIG. 22 is a perspective view of a fourth embodiment of the present invention. FIG. 23 is an explanatory view of the steel wing of FIG. 22. FIG. 24 is a perspective view of another example of the fourth embodiment. FIG. 25 is a perspective view of Embodiment 5 of the present invention. [Description of Signs] 1 steel pipe pile 2 steel pipe 3, 3a mounting member 4, 4a, 4b blade mounting portion 10 blade 11a, 11b, 12a, 12b, 21a to 21f steel blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-98818 (JP, A) JP-A-9-242069 (JP, A) JP-A-47-33024 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) E02D 5/56 E02D 5/28

Claims (1)

(57) [Claim 1] A method of manufacturing a screw-in type steel pipe pile comprising a steel pipe and a mounting member having a wing mounted on a tip or an outer peripheral surface thereof, wherein the steel pipe has a wall. Cutting a steel plate having a wall thickness greater than the thickness or a strength greater than the strength of the steel pipe to produce a parallelogram or trapezoidal steel plate, and bending the parallelogram or trapezoidal steel plate into a cylindrical shape.
A step of fabricating a mounting member having a Hobore shaped mounting portion on the end portion by welding the opposite ends Te, and attaching the wing portion with said mounting, either the lower end or mounting member of the steel pipe And a step of fitting one of them into the other and joining them together to form a screw-in type steel pipe pile.