JP2004068331A - Friction anchor pile and its driving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile for civil engineering works stable even if it is driven into the soft ground and keeping the once buried pile in a stable state in the ground even if it is vibrated due to an earthquake. <P>SOLUTION: This friction anchor pile 1 includes: a pile body 2; an anchor member 3 and an earth excavating metal blade 5. The anchor member 3 includes: an anchor pipe 31 and a threaded washer 34. The friction anchor pile 1 is hard to be pulled out of the earth by friction between the anchor pipe 31 projected from the pile body 2 and earth in the periphery of the frictio nanchor pile 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a friction anchor pile and a method of placing the same, and more particularly, to a friction anchor pile used for revetment work, road work, or foundation work of a building or a structure.
[0002]
[Prior art]
There are various types of conventional civil engineering piles. For example, there are various types of civil engineering construction piles such as a cylindrical shape having a conical tip, a triangular shape, a quadrangular shape, a simple shape in which a horizontal bar is attached to a lower portion of a pillar, and a pile formed of a concrete material. .
[0003]
[Problems to be solved by the invention]
Conventional civil engineering construction piles have various shapes, sizes, and the like. These are mainly formed by concrete piles, iron materials, steel pipes and the like. Piles for civil works are driven diagonally or vertically.
However, the conventional pile for civil engineering has a drawback that, when the ground is soft, the pile itself is not stable even if the pile is hit, and shakes or comes off. Further, even after the casting, the piles for civil engineering work were easily unstable due to vibration due to an earthquake or the like. For this reason, it is often necessary to check the stability of the civil engineering work piles during civil engineering work, which is inconvenient.
Accordingly, an object of the present invention is to improve the drawbacks and inconveniences of the conventional civil construction piles and to provide a civil construction pile capable of maintaining a stable state in the soil.
[0004]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a friction anchor pile that is stable even on soft ground, does not shake, or does not come off, and is firmly fixed in the soil.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention according to claim 1 is provided with a plurality of anchor members housed in a state of being screwed to a side surface of a hollow pile main body, and by rotating the anchor members. A friction anchor pile characterized by being projected outside a pile main body and thereby being able to be firmly fixed in soil.
[0006]
According to a second aspect of the present invention, there is provided a friction anchor pile according to the first aspect, wherein the anchor member is threaded and disposed in an opening formed in a side surface of the pile body. A washer, an anchor pipe screwed into the threaded washer and having a stopper for restricting movement in the protruding direction; and an anchor pipe provided on the anchor pipe and receiving power from an external drive source to rotate the anchor pipe. And a power receiving portion for the
[0007]
According to a third aspect of the present invention, there is provided a friction anchor pile according to the first or second aspect, wherein the anchor members are disposed at different heights on the side surface of the pile body. The adjacent anchor members are arranged so as to be at least substantially orthogonal to each other.
[0008]
According to a fourth aspect of the present invention, there is provided a friction anchor pile according to any one of the first to third aspects, wherein the anchor pipe is formed from a threaded washer by power from an external drive source. It is characterized in that it can be detached inside the pile body.
[0009]
According to a fifth aspect of the present invention, there is provided a friction anchor pile according to any one of the first to fourth aspects, wherein an earth excavation metal blade and an excavation plate are provided at a lower portion of the pile body. And a soil excavation screw is provided at at least two places on the side of the pile body.
[0010]
In order to solve the above problem, the present invention according to claim 6 is a step of placing the friction anchor pile according to any one of claims 2 to 5 in the ground, and rotating by a power from a power source. A rotation mechanism having a rotation engaging portion to be inserted into the hollow pile body, and the rotation engagement portion is engaged with the power receiving portion to rotate the anchor pipe so as to sequentially protrude into the soil. Removing the anchor pipe to the inside of the pile body by a rotation mechanism when the pipe cannot be protruded due to obstacles in the soil. I will provide a.
[0011]
According to a seventh aspect of the present invention, there is provided a method of driving a friction anchor pile according to the sixth aspect, wherein the rotational engagement portion is aligned with the power receiving portion by a sensor. It is characterized by being.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a friction anchor pile according to the present invention will be described in detail with reference to the illustrated embodiments.
FIG. 1A is a perspective view of the friction anchor pile according to the present invention in a state in which an anchor pipe is housed in a pile main body, and FIG. 1B is a perspective view of a state in which the anchor pipe protrudes from the pile main body. is there. 2 (a) and 2 (b) are cross-sectional views of the friction anchor pile shown in FIGS. 1 (a) and 1 (b), respectively. FIG. 3A is a sectional view of the anchor member in FIG. 1A, and FIG. 3B is a sectional view of the anchor member in FIG. 1B. FIG. 4 is a perspective view of a first embodiment of the anchor pipe, and FIG. 5 is a perspective view of a second embodiment of the anchor pipe.
[0013]
The illustrated friction anchor pile 1 includes a pile main body 2, an anchor member 3, a plate 4, and an earth excavation metal blade 5.
The pile body 2 has a substantially cylindrical shape, and includes a hollow portion 21 and two earth excavation screws 28. That is, the pile main body 2 forms a main pillar of the friction anchor pile 1 and has a hollow portion 21 which is hollow in the longitudinal direction. In addition, four openings for attaching the anchor member 3 are provided on the side surface of the pile main body 2. However, the number of openings is appropriately adjusted according to the number of anchor members 3 to be attached. Although the pile main body 2 shown in FIG. 1 has a circular cross section, the pile main body 2 may have a circular cross section or a regular polygonal cross section. The pile main body 2 is preferably made of a steel pipe.
[0014]
On the side surface of the pile main body 2, earth excavation screws 28 are provided at two places on an upper side and a lower side of the pile main body 2. The soil excavation screw 28 on the upper side is in a single wound state, while the soil excavation screw 28 on the lower side is in a double wound state.
When setting the friction anchor pile, the lower soil excavation screw 28 takes in the soil, and the upper soil excavation screw 28 discharges the soil. Preferably, at least two soil excavation screws 28 are disposed on the pile body 2, but the illustrated embodiment does not limit the number of soil excavation screws 28 wound on the pile body 2. The length from the surface of the pile main body 2 to the tip of the earth excavation screw 28 is suitably about 40 mm, and the angle of the screw of the earth excavation screw 28 is preferably in a range of 10 degrees to 15 degrees. The earth excavation screw 28 is preferably made of steel, and the pile main body 2 and the earth excavation screw 28 are joined by welding. However, this does not prevent the earth excavation screw 28 from being integrally formed with the pile main body 2.
[0015]
The anchor member 3 includes an anchor pipe 31 and a threaded washer 34. The anchor pipe 31 includes a power receiving portion 33. The anchor pipe 31 has a hollow tubular shape, is threaded on the outer periphery, and is a male screw 31a. A power receiving portion 33 is disposed at an end of the anchor pipe 31.
The anchor pipe 31 is attached to the pile main body 2 by screwing with the threaded washer 34. The threaded washer 34 is handled as a pair with the anchor pipe 31. The threaded washer 34 has a cylindrical shape, is hollow inside, and is provided with a female screw 34a on its inner peripheral surface. The female screw 34 a of the threaded washer 34 is screwed with the male screw 31 a of the anchor pipe 31, and when an external rotational force is applied to the power receiving portion 33, the anchor pipe 31 rotates and the male screw 31 a 31a and female screw 34a are screwed deeply or shallowly.
[0016]
The anchor member 3 is preferably made of a steel pipe such as a carbon steel pipe for machine structures. The anchor pipe 31, the stopper 32, and the power receiving portion 33 may be separately manufactured, and may be joined by welding, bonding, or the like.
[0017]
The anchor member 3 is attached to an opening on the side surface of the pile main body 2. First, the threaded washer 34 screwed with the anchor pipe 31 is fitted into the opening. Thereafter, the threaded washer 34 screwed to the anchor pipe 31 and the boundary between the openings are joined by joining techniques such as welding and bonding. Thereby, the threaded washer 34 is firmly fixed to the side surface of the pile main body 2, and the anchor member 3 is attached to the side surface of the pile main body 2.
The anchor pipe 31 has a stopper 32 at an inner end of the pile main body 2. The anchor pipe 31 is attached to the pile main body 2 so that the stopper 32 is located in the hollow portion 21 of the pile main body 2 as shown in FIGS. 2 and 3. Since the anchor pipe 31 is provided with the stopper 32, even if the male screw 31a and the female screw 34a are screwed deeply and the anchor pipe 31 protrudes outward, the stopper 32 abuts on the threaded washer 34 to hinder the course. Thus, the anchor pipe 31 is prevented from falling out of the pile main body 2.
[0018]
As shown in FIGS. 4 and 5, the power receiving portion 33 of the anchor pipe 31 is formed to protrude from the end face of the anchor pipe 31. In FIG. 4, the power receiving portion 33 is in the form of a sprocket, and in FIG. 5, it has a hexagonal cross section. However, the shape of the power receiving portion 33 may be rectangular or polygonal in cross section, and any shape that engages with a rotation mechanism having a rotation engagement portion is sufficient, and plays a role of transmitting a rotational force to the anchor pipe 31.
In addition, since the tip 31b of the anchor member 3, that is, the tip 31b of the anchor pipe 31 is used for the purpose of projecting from the pile main body 2 so as to bite into the soil, the tip 31b may have a sharp blade. good.
[0019]
In addition, as a method of attaching the anchor member 3 to the pile main body 2, first, only the threaded washer 34 of the anchor member 3 is joined to the opening of the pile main body 2, and then the anchor is removed from the hollow portion 21 of the pile main body 2. It is also possible to insert the anchor pipe 31 of the member 3 and screw the male screw 31 a and the female screw 34 a together, and attach the anchor member 3 to the pile main body 2.
[0020]
One or more anchor members 3 can be attached to the pile main body 2. The number and position of the anchor members 3 attached to the pile main body 2 are appropriately adjusted. In the embodiment shown in FIGS. 1 and 2, the anchor members 3 are located at different heights on the side surface of the pile main body 2 and the openings adjacent to each other are substantially orthogonal to fix the frictional anchor pile on all sides of the soil. It is perforated to make it.
[0021]
The bottom side of the hollow portion 21 of the pile body 2 is closed by the plate 4, and an earth excavation metal blade 5 is provided at the tip of the plate 4. The plate 4 keeps the space in the hollow portion 21 without soil entering the hollow portion 21.
The earth excavation metal blade 5 is a part to be a tip when embedding the friction anchor pile 1 in the soil. Therefore, it is preferable that the tip of the earth excavation metal blade 5 is sharp and has a conical or polygonal pyramid shape. Further, the earth excavation metal blade 5 may have a drill shape. The earth excavation metal blade 5 can withstand the strength at the time of embedding the friction anchor pile 1 in the soil, and only have to play a role of penetrating the friction anchor pile 1 into the soil.
The plate 4 and the earth excavation metal blade 5 are preferably made of a material that does not allow soil or water to penetrate therein, for example, a steel plate.
[0022]
Next, a method of placing the friction anchor pile 1 will be described in detail with reference to FIG. FIG. 6A shows a state in which the friction anchor pile 1 is pressed into the soil 80, and FIG. 6B shows a state in which the anchor pipe 31 projects from the friction anchor pile 1 into the soil 80.
First, the anchor member 3 is attached to the friction anchor pile 1 so that the anchor pipe 31 does not protrude from the pile main body 2. The friction anchor pile 1 is set up at a place where it is desired to be driven, and is driven into the soil 80 while rotating the friction anchor pile 1 by a rotary press machine (not shown). The direction of rotation matches the direction of the earth excavation screw 28 provided on the side surface of the pile main body 2. When a rotational pressure input is applied to the friction anchor pile 1, the earth excavation metal blade 5 starts digging the soil 80, the lower earth excavation screw 28 sees the soil 80, and the upper earth excavation screw 28 places the soil 80 on the ground. Into the soil 80 while discharging the water. After press-fitting the friction anchor pile 1 to a desired depth, a rotation mechanism for rotating the anchor pipe 31 from the hollow portion 21 above the friction anchor pile 1, for example, the rotation mechanism 7 shown in FIG. 7 is inserted.
[0023]
The rotation mechanism 7 shown in FIG. 7 includes a rotation engagement part 70, a sensor 71, a rod 72, a control part 73, and a support device 75 connected to the rod 72 via a connection part 74. Have been. First, the support device 75 is placed on the ground, and the rotation engaging portion 70 is disposed right above the hollow portion 21. The rotation engagement portion 70 is inserted into the hollow portion 21 by the up-down movement device provided at the end of the connection portion 74, that is, the rod 72 and / or the support device 75, interlocked with the instruction from the control portion 73. The rotation engaging portion 70 rotated by the power from the external power source 76 and the power receiving portion 33 of the anchor pipe 31 are engaged. The rotation engaging portion 70 is provided at an end of an endless track constituted by a chain or the like, and is easily engageable with and detachable from the power receiving portion 33. The anchor pipe 31 is rotated by the rotation engaging section 70 via the power receiving section 33. Due to this rotation, the male screw 31a of the anchor pipe 31 screwed so as not to protrude from the side surface of the pile main body 2 and to fit in the hollow portion 21 is screwed deeply with the female screw 34a of the threaded washer 34. Thereby, the anchor pipe 31 of the anchor member 3 protrudes from the pile main body 2. The anchor pipe 31 protruding from the pile main body 2 bites into the soil 80 in which the friction anchor pile 1 is embedded. As a result, the friction anchor pile 1 is in a state of being rooted in the soil 80 by the protruding anchor pipe 31, and the friction anchor pile 1 is firmly fixed in the soil 80. In addition, the anchor pipe 31 is made to protrude from the pile main body 2 in order from the high position side, that is, from the ground side to the lower side. Finally, the hollow portion 21 of the friction anchor pile 1 is closed by pouring concrete or the like into the hollow portion 21 or installing a lid in the hollow portion 21 to complete the casting.
[0024]
On the other hand, when the outer side of the anchor member 3 of the friction anchor pile 1 pressed into the soil 80 is not the soil 80 but a stone 80a large enough to prevent the anchor pipe 31 from projecting as shown in FIG. In this case, the anchor pipe 31 cannot be projected from the pile main body 2. Therefore, the anchor pipe 31 is removed. This is because, when the upper anchor pipe 31 is in the hollow portion 21, it becomes difficult to move the rotation engaging portion 70 for rotating the lower anchor pipe 31 further downward. The rotation engagement portion 70 of the rotation mechanism 7 rotates the anchor pipe 31 via the power receiving portion 33 in a direction opposite to that of projecting the anchor pipe 31 from the pile main body 2. As a result, the anchor pipe 31 is removed from the pile main body 2. The removed anchor pipe 31 may be removed from the hollow portion 21 to the outside, or may be dropped into the hollow portion 21. In FIG. 6B, the anchor pipe 31 is dropped into the hollow portion 21, and the anchor pipe 31 is left on the plate 4.
[0025]
Further, the rotation mechanism 7 is provided with a sensor 71 for detecting a position such as a depth in the hollow portion 21 of the pile main body 2. Therefore, the operation of projecting the anchor pipe 31 from the pile main body 2 is automatically performed. By this sensor 71, the position where the rotation engagement portion 70 engages with the power receiving portion 33 is accurately performed, and the processing from the upper anchor member 3 to the lower anchor member 3 can be sequentially performed.
[0026]
【The invention's effect】
As described above, in the friction anchor pile according to the present invention, according to the first aspect of the present invention, since the anchor pipe protrudes from the pile body pressed into the soil, the friction between the soil and the anchor pipe is reduced. The force has the effect that the pile itself is stabilized even if the pile is hit on soft ground, and the friction anchor pile can be firmly fixed in the soil. Therefore, even if an earthquake or the like occurs after the friction anchor pile is driven into the soil, the friction anchor pile does not fluctuate.
According to the second aspect of the present invention, since the anchor pipe and the threaded washer are screwed together, it is possible to rotate the anchor pipe by receiving power from the outside and project the anchor pipe from the pile body. effective. Further, since the anchor pipe has the stopper, the anchor pipe has an effect of preventing the anchor pipe from dropping out of the pile main body.
[0027]
According to the invention described in claim 3, the anchor member can be installed in four directions of the pile main body and at various height positions, and the anchor pipes complement each other, and the friction anchor pile is firmly fixed in the soil. Having.
According to the invention described in claim 4, when the anchor pipe located at the upper part cannot be protruded by an obstacle such as a stone outside the friction anchor pile, the anchor pipe can be removed, so that the anchor pipe located at the lower part can be removed. There is an effect that the projecting operation can be easily performed.
[0028]
According to the fifth aspect of the present invention, when the friction anchor pile is pressed into the soil, there is an effect that the friction anchor pile can be press-fitted with less resistance due to the rotational force. According to the invention as set forth in claim 6, the anchor pipe can be rotated by using the external rotation power, and the anchor pipe can be protruded from the pile body or detached from the pile body as needed during work. It has the effect of increasing the degree.
According to the seventh aspect of the present invention, since the position of the rotation engaging portion and the power receiving portion can be adjusted by the sensor, there is an effect that the operation of projecting the anchor pipe from the friction anchor pile can be more easily performed.
[Brief description of the drawings]
FIG. 1A is a perspective view of a friction anchor pile according to the present invention in which an anchor pipe is housed in a pile main body, and FIG. 1B is a perspective view of a state in which the anchor pipe protrudes from the pile main body. FIG.
2 (a) is a sectional view of the friction anchor pile shown in FIG. 1 (a), and FIG. 2 (b) is a sectional view of the friction anchor pile shown in FIG. 1 (b).
3A is a cross-sectional view of the anchor member in FIG. 1A, and FIG. 3B is a cross-sectional view of the anchor member in FIG.
FIG. 4 is a perspective view of the first embodiment of the anchor pipe.
FIG. 5 is a perspective view of a second embodiment of the anchor pipe.
FIG. 6 is a schematic view of an application example of the friction anchor pile according to the present invention, in which (a) shows a state in which the friction anchor pile is pressed into the soil, and (b) shows an anchor pipe from the friction anchor pile in the soil. It is in a state where it is protruded.
7A is a side view of the rotation mechanism, and FIG. 7B is a perspective view of the rotation mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Friction anchor pile 2 Pile main body 3 Anchor member 4 Plate 5 Earth excavation metal blade 7 Rotation mechanism 21 Hollow part 28 Earth excavation screw 31 Anchor pipe 31a Male screw 31b Tip 32 Stopper 33 Power receiving part 34 Thread washer 34a Female screw 70 Rotation Engaging part 71 Sensor 72 Rod 73 Control part 74 Connecting part 75 Supporting device 76 External power source 80 Soil 80a Stone

Claims (7)

It comprises a plurality of anchor members housed in a state of being screwed to the side surface of the hollow pile body,
A friction anchor pile characterized in that the anchor member is rotated so as to protrude to the outside of the pile main body, and thereby can be firmly fixed in the soil. The friction anchor pile according to claim 1,
The anchor member,
A threaded washer disposed in an opening formed in a side surface of the pile body,
An anchor pipe that is screwed to the threaded washer and has a stopper that regulates movement in the protruding direction, and
A power receiving unit provided on the anchor pipe for rotating the anchor pipe by receiving power from an external drive source;
A friction anchor pile characterized by comprising: In the friction anchor pile according to claim 1 or 2,
The said anchor member is arrange | positioned at the different height position of the side surface of the said pile main body, and the adjacent anchor member is arrange | positioned so that at least substantially mutually orthogonally, The friction anchor pile characterized by the above-mentioned. In the friction anchor pile according to any one of claims 1 to 3,
A friction anchor pile, wherein the anchor pipe is detachable from the threaded washer to the inside of the pile body by power from the external drive source. In the friction anchor pile according to any one of claims 1 to 4,
A friction anchor pile comprising: a soil excavation metal blade and an excavation plate provided at a lower portion of the pile main body; and soil excavation screws disposed at at least two places on side portions of the pile main body. Casting the friction anchor pile according to any one of claims 2 to 5 into the ground,
The anchor pipe is inserted by inserting a rotation mechanism having a rotation engagement portion that rotates by power from a power source into the hollow pile body, and engaging the rotation engagement portion with the power receiving portion. Rotating and sequentially projecting into the soil, when the anchor pipe cannot be projected by obstacles in the soil, separating the anchor pipe to the inside of the pile body by the rotation mechanism,
A method for placing a friction anchor pile, comprising: In the method of driving a friction anchor pile according to claim 6,
A method of placing a friction anchor pile, wherein the rotational engagement portion is aligned with the power receiving portion by a sensor.

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