JP2000170164A - Screw type steel pipe pile, working method therefor and rotary drive equipment used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit to efficiently carry out the work without disturbing the skin friction force by providing a torque passive portion with which the rotation torque of the rotary drive equipment is transmitted to the upper inner wall surface or inner wall surface of a steel pipe pile. SOLUTION: When penetrating a steel pipe pile 1 to a soft ground, the work is carried out after linking and coupling the inner surface torque passive portion 3 provided on the inner wall surface of a steel pipe pile 1 to the inner cylinder torque transmitting portion 25 provided in the inner cylinder 23 of a rotary drive equipment 21. On the other hand, when penetrating a steel pipe pile 1 to bard ground such as a bearing layer, an outer surface torque passive portion 3a provided at the outer wall surface of the steel pipe pile 1 is linked and coupled to the outer cylinder torque transmitting portion 26 provided at the outer cylinder 24 of the rotary drive equipment 21, and the work is carried out. Thus, the size of the rotation torque can be selected as required depending upon the state of the ground, and also the steel pipe pile can be efficiently embedded to the ground without disturbing the skin friction force of the steel pipe pile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-in type steel pipe pile, a method for constructing the same, and a rotary drive device used for the same. Screwed steel pipe piles that are buried in the ground by screw action of the wings by rotating the pile body using the wings, and a method of constructing the piles and a rotary drive device that applies a rotational force to the screwed steel pipe piles It is.

[0002]

2. Description of the Related Art A screw-in type steel pipe pile having a wing provided at a tip end or an outer periphery thereof is connected to a rotary driving device mounted on a construction machine installed on the ground, and a rotational force of the rotary driving device. Is transmitted to a steel pipe pile, and is buried in the ground with no soil removal by the screw action of the wings. Various proposals have been conventionally made, and an example thereof is described in Japanese Utility Model Laid-Open No. 6-30224. There is a device (hereinafter referred to as conventional technology).

[0003] This prior art is provided with a tubular part having an inner diameter slightly larger than the outer diameter of the steel pipe pile, and an auger joint protruding from the upper end thereof. A T-shaped engaging hole is formed by a vertical guide hole which can be inserted from the lower end of a locking piece protruding outward and a window hole which allows the locking piece to move in the horizontal direction. Both sides of the hole are extended downward from the upper end of the guide hole, and a cap is used which has a recess formed in the upper end of both sides of the guide hole and into which a locking piece is inserted with a protruding piece interposed. By connecting the parts, the rotation of the auger by the motor is transmitted to the steel pipe pile.

[0004]

In the prior art as described above, locking pieces are provided on both outer sides of the pile head of the steel pipe pile to engage with the concave portion of the cap. Since the steel pipe piles are joined and constructed, there is a problem in that the locking pieces disturb the peripheral ground of the steel pipe piles at the time of construction, and the peripheral friction force is reduced. In addition, the ground that can penetrate steel pipe piles with a relatively small torque, and the hard ground such as a support layer that requires a large torque are constructed with the same rotation torque by one motor,
There is also a problem that construction efficiency is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses a different amount of rotational torque depending on the condition of the ground to enable efficient installation without disturbing the peripheral frictional force. It is an object of the present invention to obtain a steel pipe pile, a method for constructing the pile, and a rotary drive device used for the method.

[0006]

A screw-in type steel pipe pile according to the present invention is provided with a torque passive portion to which a rotational torque of a rotary drive is transmitted on an inner wall surface or an outer wall surface of an upper part of the steel pipe pile. .

[0007] Further, a screw-in type steel pipe pile according to the present invention comprises:
In a long pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary driving device and joined, a torque passive portion to which the rotational torque of the rotary driving device is transmitted is provided on the uppermost steel pipe pile. It is provided on the wall surface, and the other steel pipe piles are provided on the upper inner wall surface.

Further, in the screw-in type steel pipe pile according to the present invention, a torque passive portion for transmitting the rotational torque of the rotary drive device is provided on an outer wall surface at an upper part of the steel pipe pile at a predetermined position, and is provided on other steel pipe piles. Is provided on the upper inner wall surface, and the rotational torque transmitted to the steel pipe pile at the predetermined position is made larger than the rotational torque transmitted to the other steel pipe piles.

A method for constructing a screw-in type steel pipe pile according to the present invention is to provide a long pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined to the inner wall surface of the lowermost steel pipe pile. Connecting the torque passive unit to the rotary drive device to penetrate into the ground, joining the uppermost steel pipe pile to the lowermost steel pipe pile directly or via the steel pipe pile, Connecting the torque passive portion provided on the outer wall surface to the rotary drive device and burying a long steel pipe pile in the ground.

[0010] The method for constructing a screw-in type steel pipe pile according to the present invention is a method for constructing a long screw-in type steel pipe pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined. A step of connecting the torque passive portion provided on the inner wall surface of the lower steel pipe pile to the rotary drive device to penetrate into the ground, and joining the middle steel pipe pile to the lowermost steel pipe pile directly or via the steel pipe pile And joining the uppermost steel pipe pile directly or via the steel pipe pile to the intermediate steel pipe pile, and a torque passive part provided on the outer wall surface of the predetermined intermediate part and the uppermost steel pipe pile. A step of burying a long steel pipe pile in the ground in connection with the rotary drive device, and transmitting the rotational torque transmitted to the predetermined intermediate portion and the uppermost steel pipe pile to other steel pipe piles. This is larger than the torque.

[0011] Further, a rotation driving device for a screw-in type steel pipe pile according to the present invention is a rotatable inner cylinder provided with a torque transmitting portion for locking a torque passive portion provided on an inner wall surface of the steel pipe pile, and the inner cylinder. A cap having a rotatable outer cylinder provided with a torque transmitting portion which is disposed concentrically with a torque passive portion provided on the outer wall surface of the steel pipe pile, and the inner cylinder and the outer cylinder are directly or a distributor. And a motor that rotates through the motor. Further, the rotational torque of the outer cylinder is larger than the rotational torque of the inner cylinder.

[0012]

[First Embodiment] FIG. 1 is an explanatory view of a first embodiment of the present invention. In the figure, 1 is a screwed steel pipe pile with wings (hereinafter, simply referred to as a steel pipe pile), 2 is a prefabricated pile with a hollow circular cross section (hereinafter, referred to as a pile body) such as a steel pipe or a concrete pile, and is provided at the tip or outer periphery. Is provided with wings 10. Reference numeral 20 denotes a base machine, which is a construction machine installed on the ground. The rotation drive device 21 for the steel pipe pile 1, which includes a forward / reverse rotating motor and a cap to which the pile head of the steel pipe pile 1 is connected, can move vertically. It is installed.

The wings 10 provided on the pile 2 have a diameter D ₂ substantially equal to the outer diameter D of the pile 1 at the center as shown in FIG.
Plate 12 having an outer diameter D ₁ larger than the outer diameter D of the pile 1 (for example, D ₁ = 2D). Steel wings 1
3a and 13b are attached by welding continuously in the same direction so that the height difference (pitch) between the start end and the end is P at the outer periphery of the tip portion of the pile body 1 or slightly above the tip portion thereof, and And a substantially spiral blade 10 is formed.

Here, the outer diameter D ₁ of the circular steel plate 11 (therefore, the outer diameter of the blade 10) is generally 1.5 to 2.5 times the outer diameter D of the pile 1 based on experience in design and construction. Preferably, the pitch P is 0.05 to the outer diameter D of the pile 1.
Desirably about 0.30 times. In addition, the said blade | wing 10 shows an example, The steel blade | wing 13a, 13b, or 1
The shape, structure, number, mounting position, mounting means, and the like of the wings can be changed as appropriate, such as mounting the spiral wings on the tip of the pile 2 or the outer periphery.

Next, a connecting means for connecting the steel pipe pile 1 and the rotary drive unit 21 will be described with reference to FIGS. In both figures, reference numeral 22 denotes a cap which is a main part of the rotary drive device 21.
A cylindrical inner cylinder 23 having an outer diameter smaller than the inner diameter of the pile body 2 and a cylindrical outer cylinder 24 having an inner diameter larger than the outer diameter of the pile body 2 and arranged concentrically with the inner cylinder 23. The inner cylinder 23 and the outer cylinder 24 are driven by one motor 51 that rotates in the forward and reverse directions. The inner cylinder 23 and the outer cylinder 24 may be independently driven by two motors rotating in the forward and reverse directions.

On the peripheral wall of the inner cylinder 23, there are provided a plurality of inner cylinder torque transmitting portions 25 formed of concave portions.
A plurality of outer cylinder torque transmitting portions 26 formed of concave portions are provided on the peripheral wall of the outer cylinder 24. Such a rotary drive device 21
The outer cylinder 24 is slower in rotation than the inner cylinder 23, but can obtain a large rotational torque.

On the other hand, in the vicinity of the pile head of the steel pipe pile 1, FIG.
As shown in (a), the inner surface torque passive portion 3 which engages with the inner cylinder torque transmitting portion 25 provided on the inner cylinder 23 of the rotary drive device 21 on the inner wall surface, or as shown in FIG. An external torque passive portion 3a that engages with an external cylinder torque transmitting portion 26 provided on the external cylinder 24 of the rotary drive device 21 is provided on the outer wall surface.

Next, the operation of the present invention will be described. Steel pipe pile 1
4A penetrates into relatively soft ground, as shown in FIG. 4A and FIG.
The internal torque transmitting portion 25 provided on the inner pipe is engaged with the internal torque passive portion 3 provided on the inner wall surface of the steel pipe pile 1 for connection and construction. When the steel pipe pile 1 penetrates into a hard ground such as a support layer, as shown in FIG. 4B, the steel pipe pile 1 is provided to an outer cylinder torque transmitting portion 26 provided in the outer cylinder 24 of the rotary drive 21. The outer surface torque passive portion 3a provided on the outer wall surface is locked and connected for construction.

As described above, since the inner cylinder 23 has a smaller torque than the outer cylinder 24 but rotates faster, it is better to construct the steel pipe pile 1 using the inner cylinder 23 in soft ground where little torque is required. It can be quickly screwed and penetrated. Also,
When screwing and penetrating the steel pipe pile 1 into a hard ground such as a support layer, a large torque is required.
Connect to 4. When the wing 10 hits an obstacle or the like during the construction, the steel pipe pile 1 may be slightly raised by rotating the motor 51 in the reverse direction, and may be rotated forward again to penetrate.

In the construction of a screw-in type steel pipe pile, a plurality of steel pipe piles are often penetrated to the support layer by a long pile. In such a case, for example,
As shown in FIG. 5, the first steel pipe pile 1 (lower pile) and the second steel pipe pile 1a (middle pile)
3rd steel pipe pile 1b
The (upper pile) is connected to the outer cylinder 24 and constructed because the steel pipe pile 1 as the lower pile penetrates into a hard ground such as a support layer and requires a large torque.

In this case, for example, two steel pipe piles 1, 1a
When the joint is constructed by joining, the wing 10 of the steel pipe pile 1a as the upper pile may be omitted, and the screw may be screwed and penetrated with only the wing 10 of the steel pipe pile 1 as the lower pile, or the steel pipe pile as the lower pile. A second wing may be further provided above the first wing 10. When three or more steel pipe piles 1, 1 a, 1 b are joined and constructed, the wing 1 is attached to the second or third steel pipe piles 1 a, 1 b.
0 may be provided. .

At the time of construction, the first and second steel pipe piles 1 and 1a may be connected to the outer cylinder 24 of the rotary drive device 21, but the outer torque passive portion 3a is attached to the outer wall surfaces of these steel pipe piles 1 and 1a. Is provided, the ground around the pile body 2 is disturbed upon screwing and the peripheral frictional force is reduced. Therefore, the inner surface torque passive portion 3 is provided on the inner wall surface of the steel pipe piles 1, 1 a and connected to the inner cylinder 23. Better. However, depending on the situation, the external torque passive portion 3 may be provided on the outer wall surfaces of the steel pipe piles 1 and 1a constituting the lower pile and the middle pile (the middle pile). Since the third steel pipe pile 1b, which is the upper pile, is completed near the surface of the ground and does not affect the peripheral frictional force of the pile body 2, the steel pipe pile 1b is not affected.
There is no problem even if the outer surface torque passive portion 3a is provided on the outer peripheral surface of b. In the case where the steel pipe pile 1b, which is the upper pile, is not provided with the external torque passive portion 3a but is provided with the internal torque passive portion 3 and the inner cylinder torque of the inner cylinder 23 of the rotary drive device 21 is used. You may make it engage with the transmission part 25.

As described above, according to the present invention, the rotation required to penetrate the steel pipe pile 1 is determined by the position of the torque passive portion provided near the pile head of the steel pipe pile 1 using one rotation drive device 21. Since the torque can be selected, the construction efficiency can be improved. In addition, the torque passive part provided in the steel pipe pile 1 may be one when the rotation torque is small, but it is necessary to increase the number as the rotation torque increases.
A maximum of about four is desirable.

[Embodiment 2] FIG. 6 is a longitudinal sectional view schematically showing an example of a rotary driving device for a screw-in type steel pipe pile according to a second embodiment of the present invention. 22 and a motor 51 that rotates in the forward and reverse directions. In the cap 22, a reference numeral 23 denotes a hollow cylindrical inner cylinder, and a plurality of substantially T-shaped inner cylinder torque transmitting portions 25 which open at the lower end portion are provided on the peripheral wall. Have been. Reference numeral 42 denotes a gear mounted on the output shaft 41 of the motor 51 above the inner cylinder 23.
Numeral 24 is a cylindrical outer cylinder arranged concentrically on the outer periphery of the inner cylinder 23. A substantially T-shaped outer cylinder torque transmitting portion 26 opening at the lower end is provided on the peripheral wall, and is provided at the upper portion. Internal gear 43
Is provided.

Reference numeral 44 denotes a gear 42 and an internal gear 43 of the outer cylinder 24.
The rotation of the gear 42 is transmitted to the outer cylinder 24 via the internal gear 43 by a planetary gear interposed between the outer gear 24 and the outer gear 24. 46 is a motor 5
1, a bearing for supporting the output shaft 41 and the shaft 45 of the planetary gear 44; 47, a frame; and 48, a bearing interposed between the outer cylinder 24 and the frame 47.

In the rotary drive 21 as described above, when the motor 51 is driven, the inner cylinder 23 connected to the output shaft 41 rotates, and the rotation of the output shaft 41
2. It is transmitted to the internal gear 43 via the planetary gear 44, and rotates the outer cylinder 24 in the same direction as the inner cylinder 23 and at a lower rotation speed. Therefore, the outer cylinder 24 can obtain a larger torque than the inner cylinder 23.

FIG. 7 is a cross-sectional view schematically showing another example of the rotary driving device 21. In addition, the rotation driving device 21 of FIG.
The same reference numerals are given to the same parts as those described above, and the description is omitted. The rotation drive device 21 according to the present example is configured to rotate the inner cylinder 23 and the outer cylinder 24 constituting the cap 22 independently of each other. That is, the inner cylinder 23 rotates the gear 44a meshing with the gear 42a attached thereto via the shaft 41a to the output shaft 4 of the first motor 51a that rotates forward and reverse.
5a, and a gear 44b meshing with the internal gear 43 of the outer cylinder 24 is mounted on an output shaft 45b of a second motor 51b that rotates forward and backward.

In the rotary driving device 21 configured as described above, the inner cylinder 23 and the outer cylinder 24 are independently rotated in the forward or reverse direction by the motor 51a or 51b. The second motor 51b for rotating the outer cylinder 24
Alternatively, a motor having a larger torque than the first motor 51a for rotating the inner cylinder 23 may be used.

FIGS. 8 and 9 show an example of the structure of the inner cylinder 23 of the above-mentioned rotary drive device 21. FIG. 8 (a) has an open lower end as in FIGS. 6 and 7. An insertion portion 27 provided on the peripheral wall of the inner cylinder 23 in the axial direction and opening at the lower end.
A plurality of T-shaped inner cylinder torque transmitting portions 25 (two cases are shown in the figure) each comprising a locking portion 28 provided at right angles to the upper end thereof. It is. FIG. 8B shows a configuration in which one plate-shaped member 29 is suspended in the diametrical direction of the lower surface of the inner cylinder 23 whose bottom is closed to form the inner cylinder torque transmitting unit 25a.

FIG. 8 (c) shows an inner cylinder composed of a plurality of (four in the figure) studs 30 hanging down at equal intervals on the lower surface of the inner cylinder 23 whose bottom is closed. This is provided with a torque transmission section 25b. FIG. 8D illustrates a configuration in which the cross-shaped member 31 is hung down on the lower surface of the inner cylinder 23 whose bottom is closed to form the inner cylinder torque transmitting unit 25c.

FIG. 9A shows an inner cylinder torque transmitting portion 25d in which a locking member 32 is attached to the tip of the stud 30 shown in FIG.
FIG. 8B shows a state in which the engagement member 33 is attached to one or both sides (both sides are shown in the figure) of the lower end of the cross-shaped member 31 in FIG. It is composed. Note that locking members projecting to one side or both sides may be provided at both ends in the longitudinal direction of the plate-like member 29 in FIG. 8B.

FIG. 10 shows an example of the structure of the outer cylinder 24 of the rotary driving device 21. FIG. 10 (a) is provided in the axial direction on the peripheral wall of the outer cylinder 24 having the lower end opened, and is opened at the lower end. Insertion portion 34 and a locking portion 35 provided orthogonally to the upper end thereof
A plurality of (in the figure, four cases are shown) T-shaped outer cylinder torque transmitting portions 26 are provided at equal intervals. FIG. 10B shows a plurality of (in the figure, four cases) piece-shaped locking members protruding inward at or near the lower end of the inner wall surface of the outer cylinder 24 having the lower end opened. Part 35
Are provided at equal intervals.

FIG. 11 shows an example of the structure of the upper part of the pile 2 constituting the steel pipe pile 1. FIG. 11A shows the pile 2
11 (b), provided at the upper end of the inner wall surface or in the vicinity thereof are a plurality of (in the figure, four are shown) piece-shaped inner surface torque passive portions 3 protruding inward at equal intervals. 11) shows a configuration in which a cross-shaped internal torque passive portion 3b is provided, and FIG. 11C shows a configuration in which one internal torque passive portion 3c is provided in the diameter direction. FIG. 11D shows a plurality of piece-shaped external torque passive portions 3a provided at equal intervals at or near the upper end of the outer wall surface of the pile body 2.

Next, an example of connection between the inner cylinder 23 and the pile body 2 and the outer cylinder 24 and the pile body 2 of the above-described rotary drive device 21 will be described. FIG. 12 shows the inner cylinder 23 shown in FIG.
1 (a), the inner cylinder 23 is provided on one side surface of each inner surface torque passive portion 3 provided on the inner wall surface of the pile body 2.
The studs 30 that constitute the inner cylinder torque transmitting portion 25b provided on the lower surface of each of them are brought into contact with each other. When the motor is driven to rotate the inner cylinder 23 in the direction of the arrow, the rotation torque is transmitted to the pile 2 via the stud 30 and the inner surface torque passive unit 3.
To rotate the pile 2 and thus the steel pipe pile 1 in the direction of the arrow. Thereby, the steel pipe pile 1 is penetrated into the ground by the screw action of the wing 10 provided near the tip.

FIG. 13 shows the outer cylinder 24 of FIG.
1 (d), the outer cylinder 24 is provided on one side of an external torque passive portion 3a provided on the outer wall surface of the pile 2.
The engaging portions 35 constituting the outer cylinder torque transmitting portion 26a provided on the inner wall of each of the above are brought into contact with each other. Then, when the motor is driven to rotate the outer cylinder 24 in the direction of the arrow, the rotation torque is transmitted to the pile body 2 via the locking portion 35 and the external surface torque passive portion 3a, and the pile body 2, and thus the steel pipe pile 1 is rotated in the direction of the arrow. As a result, the steel pipe pile 1 rotates with a torque greater than that of the inner cylinder 23 and at a lower speed, and the wing 10 provided near the tip end.
By the screw action, the steel penetrates into hard ground such as a support layer.

As shown in FIGS. 8 (a), 9 (a) and 9 (b), the inner cylinder torque transmitting portions 25, 25d, 25
e, when the locking portion 28 or the locking members 32, 33 are provided,
Alternatively, as shown in FIG. 10 (a), when the locking portion 35 is provided on the outer cylinder torque transmitting portion 26 of the outer cylinder 24,
Alternatively, when connecting the outer cylinder 24 and the pile 2,
And the like can be locked to the lower surface of the inner surface torque passive portion 3, 3b, 3c of the pile body 2 or the outer surface torque passive portion 3a. This makes it possible to prevent the steel pipe pile 1 from dropping when the steel pipe pile 1 is connected to the rotary drive device 21 and suspended. Also, when pulling out the buried steel pipe pile 1 for some reason,
This can be hung.

The embodiment of the rotary drive device 21 has been described above. However, the rotary drive device 21 according to the present invention is not limited to this. A device having another structure may be used as long as the device can obtain the torque of (1). Further, the structure of the connecting portion provided on the inner cylinder 23, the outer cylinder 24 of the rotary drive device 21 and the pile body 2 of the steel pipe pile 1 is not limited to the above, and can be appropriately changed.

In the above description, the case where the rotary drive device is used for the construction of the screw-in type steel pipe pile according to the present invention has been described. However, the rotary drive device according to the present invention is applicable to the construction of the screw-type steel pipe pile having another structure. Can also be used. For example,
Insert the auger into the hollow screw-in type steel pipe pile and project the tip part slightly from the pile tip, connect the auger to the inner cylinder of the rotary drive and connect the steel pipe pile to the outer cylinder, and use the auger to ground the ground. It can also be used for the construction of a screw-in type steel pipe pile in which a steel pipe is screwed into this softened ground by excavation softening.

[0039]

According to the screw-in type steel pipe pile according to the present invention, a passive portion to which the rotational torque of the rotary drive device is transmitted is provided on the inner wall surface or the outer wall surface of the upper part of the steel pipe pile. The magnitude of the rotation torque can be properly used, and the steel pipe pile can be efficiently buried in the ground without disturbing the peripheral frictional force of the steel pipe pile.

Further, the screw-in type steel pipe pile according to the present invention comprises:
In a screw-type long pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined, a torque passive portion to which the rotational torque of the rotary drive device is transmitted is changed to an upper portion by a top steel pipe pile. Since it is provided on the outer peripheral surface and the other steel pipe piles are provided on the upper inner wall surface, the lower side of the steel pipe pile penetrating into relatively soft ground is constructed with normal rotational torque, and the lower end is made of a hard material such as a support layer. In the case of penetrating into the ground, the magnitude of the rotational torque can be selected according to the state of the ground, for example, construction is performed with a rotational torque larger than this. Further, since only the uppermost steel pipe pile of the long pile is provided with the torque passive portion on the outer wall surface, it can be efficiently buried in the ground without disturbing the peripheral frictional force of the steel pipe pile.

A torque passive portion for transmitting the rotational torque of the rotary drive device is provided on an upper outer wall surface of a steel pipe pile at a predetermined position, and is provided on an upper inner wall surface of other steel pipe piles. Since the rotational torque transmitted to the steel pipe pile at the position is larger than the rotational torque transmitted to the other steel pipe piles, the same effect as described above can be obtained.

The method for constructing a screw-type steel pipe pile according to the present invention is a method for constructing a screw-type long pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined.
The process of connecting the torque passive part provided on the inner wall surface of the bottom steel pipe pile to the rotary drive and penetrating into the ground, and joining the top steel pipe pile to the bottom steel pipe pile directly or through the steel pipe pile And a step of connecting the torque passive portion provided on the outer wall surface of the uppermost steel pipe pile to the rotary drive and burying the long steel pipe pile in the ground. Can be obtained.

Further, the method for constructing a screw-in type steel pipe pile according to the present invention is a method for constructing a long screw-in type long pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive and joined. A step of connecting the torque passive portion provided on the inner wall surface of the lowermost steel pipe pile to the rotary drive device and penetrating into the ground,
A step of joining the middle steel pipe pile directly or through the steel pipe pile to the bottom steel pipe pile, and a step of joining the top steel pipe pile to the middle steel pipe pile directly or via the steel pipe pile; Connecting the torque passive portion provided on the outer wall surface of the intermediate portion and the uppermost steel pipe pile to the rotary driving device to bury the long steel pipe pile in the ground, wherein the predetermined intermediate portion and the uppermost steel pipe are provided. Since the rotational torque transmitted to the pile is made larger than the rotational torque transmitted to the other steel pipe piles, substantially the same effects as described above can be obtained.

A rotary drive device for a screw-in type steel pipe pile according to the present invention is a rotatable inner cylinder provided with a torque transmitting portion for locking a torque passive portion provided on an inner wall surface of the steel pipe pile, and concentric with the inner cylinder. That has a rotatable outer cylinder provided with a torque transmitting portion that is arranged in a fixed manner and is engaged with a torque passive portion provided on the outer peripheral surface of the steel pipe pile, and rotates the inner cylinder and the outer cylinder directly or via a distributor. And the rotation torque of the outer cylinder is configured to be larger than the rotation torque of the inner cylinder, and one rotation drive device rotates according to the state of the ground penetrating the screwed pile. Since the torque and the penetration speed can be selected, the construction efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing an example of a blade of the steel pipe pile of FIG.

FIG. 3 is an explanatory view showing a process of manufacturing the wing of FIG. 2;

FIG. 4 is an explanatory diagram showing a connection state between the steel pipe pile and the rotary drive device in FIG. 1;

FIG. 5 is an explanatory diagram of construction according to the present embodiment.

FIG. 6 is a longitudinal sectional view of an example of a rotary driving device according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of another example of the rotary drive device according to the second embodiment of the present invention.

FIG. 8 is a perspective view showing an example of the structure of the inner cylinder of the rotary drive device.

FIG. 9 is a perspective view showing an example of the structure of the inner cylinder of the rotary drive device.

FIG. 10 is a perspective view showing an example of a structure of an outer cylinder of the rotary drive device.

FIG. 11 is a perspective view showing an example of a structure of a pile head of a steel pipe pile.

FIG. 12 is an explanatory diagram showing an example of connection between a steel pipe pile and an inner cylinder of a rotary drive device.

FIG. 13 is an explanatory view showing an example of connection between a steel pipe pile and an outer cylinder of a rotary drive device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw-in type steel pipe pile (steel pipe pile) 2 Pile body 3 Inner torque passive part 3a Outer torque passive part 10 Blade 20 Base machine 21 Rotary drive 22 Cap 23 Inner cylinder 24 Outer cylinder 25 Inner cylinder torque transmitting part 26 Outer cylinder torque transmission Part 51 Motor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Shinohara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Gen Gen 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan F-term in Honko Tube Co., Ltd. (Reference) 2D041 AA02 BA31 CA05 CB01 DB02 FA14 2D050 AA06 AA16 CB04 CB23

Claims (7)

[Claims] 1. A screw-in type steel pipe pile, which is connected to a rotary drive device and rotates a steel pipe pile having a wing at a tip portion or an outer peripheral surface, and is buried in the ground by a screw action of the wing, wherein: A screw-type steel pipe pile provided with a torque passive portion on an inner wall surface or an outer wall surface for transmitting a rotational torque of the rotary drive device. 2. A long screw-in type steel pipe pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and are joined, wherein a torque passive portion to which the rotational torque of the rotary drive device is transmitted is the lowest. A screw-in type steel pipe pile provided on the upper outer wall surface for the upper steel pipe pile and on the upper inner wall surface for the other steel pipe piles. 3. A long screw-in type steel pipe pile in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and are joined, wherein a torque passive portion to which a rotational torque of the rotary drive device is transmitted is defined. The steel pipe pile at the position is provided on the upper outer wall surface for the other steel pipe piles, and the rotational torque transmitted to the steel pipe pile at the predetermined position is larger than the rotational torque transmitted to the other steel pipe piles. Screw-in type steel pipe pile characterized by the above-mentioned. 4. A method for constructing a long screw-in type steel pipe pile, in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined, a torque passive portion provided on an inner wall surface of a lowermost steel pipe pile. And a step of connecting the uppermost steel pipe pile to the lowermost steel pipe pile directly or through a steel pipe pile, and a step of connecting the uppermost steel pipe pile to the lowermost steel pipe pile, and an outer wall surface of the uppermost steel pipe pile. Connecting the torque passive part provided in the above to the rotary drive device and burying a long steel pipe pile in the ground. 5. A method for constructing a long screw-in type steel pipe pile, in which a plurality of steel pipe piles are sequentially penetrated into the ground by a rotary drive device and joined, a torque passive portion provided on an inner wall surface of a lowermost steel pipe pile. Connecting to a rotary drive device and penetrating into the ground, and joining the steel pipe pile of the middle part directly to the lowermost steel pipe pile or through the steel pipe pile, directly or to the steel pipe pile of the middle part Joining the uppermost steel pipe pile via the steel pipe pile, and connecting a predetermined intermediate part and a torque passive part provided on the outer wall surface of the uppermost steel pipe pile to the rotary drive device to thereby form a long steel pipe pile Embedded in the ground, wherein the rotational torque transmitted to the predetermined intermediate portion and the uppermost steel pipe pile is larger than the rotational torque transmitted to the other steel pipe piles. Construction method. 6. A rotatable inner cylinder provided with a torque transmitting portion for locking a torque passive portion provided on an inner wall surface of a steel pipe pile, and provided on an outer wall surface of the steel pipe pile arranged concentrically with the inner cylinder. A cap having a rotatable outer cylinder provided with a torque transmitting portion to which the torque passive portion is locked, and a motor for rotating the inner cylinder and the outer cylinder directly or via a distributor. A rotary drive for screw-in steel pipe piles. 7. The screw drive type steel pipe pile rotation drive device according to claim 4, wherein the rotation torque of the outer cylinder is larger than the rotation torque of the inner cylinder.