JP3490043B2 - Rotating press fitting method of pipe pile - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to relates to rotary press fit method of applying pipe pile that buried in the ground to support the building or structure.

[0002]

2. Description of the Related Art Conventionally, there is a pipe pile and a rotary press-fitting construction method in which an excavation head is provided at the tip of a steel pipe pile to excavate and press fit the ground while rotating (JP-A-11-303069).
See issue. ). In most cases, the excavation head A has a spiral blade structure as shown in FIG. 4, and the excavation head A is screwed into the ground while excavating with the excavation head A to rotationally press fit the pipe pile B.

[0003]

Since the pipe pile supports the foundation of a building or structure, it needs to have a strength capable of withstanding a large load. However, in the conventional pipe pile B, sufficient strength cannot be obtained because the excavation head A to support the load is twisted in a spiral shape. Further, since it is difficult to weld the spiral blade, it is necessary to weld it to the pile main body C at the factory before transporting it to the site, and since the spiral blade is bulky, the transportation efficiency is poor.

[0004] The present invention has been made in view of the above, and its object is to provide a rotary press-construction methods of easy pipe pile out precision and strength.

[0005]

In order to achieve the above object, the present invention provides the following a to e at the tip of a tubular pile main body.
Using pipe piles with drilling heads having the following x, y
A rotary press-fitting construction method for pipe piles that meets the requirements is provided . a. The drilling head consists of a plate-shaped support board that is attached to the tip of the pile, and a pointed tip that projects from the lower surface of the center of the support board.
It is composed of a triangular plate-shaped rotary fulcrum member that pierces the ground and a plate-shaped excavating blade that is provided on the lower surface of the support substrate. b. The excavating blades are provided one by one corresponding to a plurality of radiations at equal intervals from the center of rotation of the support substrate, and have an acute inclination with respect to the radiations. c. The drilling blade has an acute inclination between the front surface of the blade and the lower surface of the support substrate. d. The digging blade is a large protrusion protruding outside the outer peripheral edge of the support substrate.
By setting the of come, you to allow earth removal space between the inner circumferential surface and the supporting substrate of the drilled hole in the digging edge. e. The rotation direction of the pipe pile is set so that the soil excavated by each inclination of the excavation blades is sent from the soil discharge space to the upper surface side of the support substrate. x. While rotating the pipe pile, press it into the ground and
Reach y. In addition, the pipe pile has an angle smaller than (360 degrees / number of drilling blades)
While repeatedly rotating within the range of degrees, press-fitting is equivalent to the height of the drilling blade
Let

The pipe pile of the present invention has a sharp tip on the drilling head.
There is a triangular plate-shaped rotary fulcrum member that pierces the board, and it rotates accurately about that fulcrum like a top. Therefore, it is possible to carry out the construction accurately at the target point. Further, since the excavating blade is inclined at an acute angle with respect to the radiation having the rotation center as the base point, the excavated soil moves toward the outer periphery of the excavating head, and the angle between the front surface of the blade and the support substrate becomes an acute angle. Excavated soil moves upward. Therefore, the excavated soil comes out from the soil discharge space between the hole and the support substrate to the upper surface side of the support substrate and backfills the hole.

In the pipe pile according to the present invention, however, the support substrate is grounded at the bottom of the excavated hole via the excavating blade, and the load is supported on the entire surface of the support substrate to obtain high strength. Further, since the excavating head and the pile main body have a simple welding structure which is similar to welding a plate to the end of a pipe and does not require a high technology, it is possible to perform welding at the site. Therefore, the pile main body and the excavation head can be separated and efficiently transported.

Then , while the pipe pile is rotated, it is press-fitted into the ground to reach a predetermined depth, and then the pipe pile (36
0 ° / digging edge number) by press-fit height equivalent of digging edge while repeating rotation in the range of smaller angles so as to fix
Takara, digging blade support substrate ground Nde write eating on the bottom of the hole
To do. Therefore, the pipe pile has the highest strength.

Further , as described in claim 2, the digging is performed.
The cutting edge has a shape that combines horizontal and tapered parts.
If this is done, at the beginning of the excavation, only the horizontal part will be excavated and gradually
With the addition of the supermarket part, the entire cutting edge will be excavated. This
To reduce the torque required at the start of excavation
Since it is possible, there is no need for the rotation drive means or the pile main body 2 described later.
It doesn't make sense.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 (a) is a front view showing the main part of the pipe pile, FIG. 1 (b) is a bottom view of the pipe pile, FIG. 2 is a front view showing the usage state, and FIG. 3 is a partially enlarged view showing the main part. It is a front view.

The pipe pile 1 of the present invention is formed by welding a drill head 3 to the tip of a steel pipe pile main body 2. The excavation head 3 is provided with a disc-shaped support substrate 4 attached to the tip of the pile main body 2, a triangular plate-shaped rotation fulcrum member 5 projecting from the center lower surface of the support substrate 4, and a lower surface of the support substrate 4. It consists of a drilling blade 6.

The excavating blades 6 are provided one by one in correspondence with a plurality of (in the embodiment, three at 120 degree intervals) radiation L equally spaced from the center of rotation of the support substrate 4, and the radiation is provided. It is inclined so that the angle α is an acute angle with respect to L. The angle α in the embodiment is about 60 degrees, but the angle may be appropriately increased or decreased depending on the soil quality. Needless to say, it is not necessary to write the radiation L on the actual product.

As shown in FIG. 3, the excavating blade 6 is inclined so that the angle β formed by the front surface of the blade (surface on the side receiving earth pressure) and the lower surface of the support substrate 4 is an acute angle. Embodiment angle β
Is about 60 degrees, but the angle may be appropriately increased or decreased in accordance with the soil quality like the angle α.

Further, the digging blade 6 is sized to protrude to the outside of the outer peripheral edge of the support substrate 4, and the diameter of the hole H excavated by the digging blade 6 exceeds the diameter of the support substrate 4. Therefore, an earth removing space 7 is formed between the inner peripheral surface of the hole H excavated by the excavating blade 6 and the support substrate 4. Needless to say, such an earth discharging space 7 can be formed by devising the size and arrangement of the digging blade 6 even if the support substrate 4 is not circular, and therefore the shape of the support substrate 4 is not limited to a circle. For example, the support substrate 4 may have a polygonal shape of a triangle or more, an elliptical shape, or a notch for forming an earth discharging space on the outer circumference of a disk.

The cutting edge of the excavating blade 6 has a shape in which a horizontal portion 6a and a tapered portion 6b are combined. At the beginning of excavation, only the horizontal portion 6a is excavated, and the tapered portion 6b is gradually added to excavate the entire cutting edge. It is supposed to do. By doing so, the torque required at the start of excavation can be reduced, so that the rotation drive means and the pile main body 2 which will be described later will not be overloaded.

Next, a construction method for burying the pipe pile 1 of the present invention will be described. First, the pile main body 2 and the excavation head 3 are separately conveyed, and the excavation head 3 is welded to the tip of the pile main body 2 on site. The pipe pile 1 in which the pile main body 2 and the excavation head 3 are integrated is inferior in loading efficiency to the loading platform like an umbrella that is wide open, but since the single pile main body 2 is a simple steel pipe, it can be separated from the excavation head 3 separately. If so, many can be loaded efficiently.

Next, as shown in FIG. 2, the pile main body 2 of the pipe pile 1
It stands upright on the ground Z through the steady rest 8. At this time, the rotation fulcrum member 5 is pierced at the center of the pile driving point. Then, the rotary joint 9 directly connected to the rotation driving means (not shown) is fitted on the upper end of the pipe pile 1 to rotate the pipe pile 1 counterclockwise in FIG. 1 (b). Then, the excavation head 3 rotates around the rotation fulcrum member 5, the horizontal portion 6a of the excavation blade 6 scrapes the ground Z, and the tapered portion 6 follows as the pipe pile 1 descends.
b is also added to excavate the ground Z with the entire excavation blade 6. Since the excavated soil is sent to the outside of the excavation head 3 in accordance with the inclination of the angle α of the excavation blade 6, the soil rises around the excavation head 3 at the beginning of excavation.

Next, as the excavation progresses and the excavation head 3 goes under the ground, the inner periphery of the hole H excavated as described above and the support substrate 4 are excavated.
A soil removal space 7 will be created in between. Then, the excavated soil is sent upward according to the inclination of the angle β of the excavating blade 6 as shown in FIG. 3, so that the excavated soil passes through the excavation space 7 according to the sum of the moving direction due to the inclination of the angle α. It appears on the upper surface side of the support substrate 4. Therefore, the upper surface side of the support substrate 4 is sequentially backfilled with dug soil, and the pipe pile 1 is gently press-fitted while the pipe pile 1 is embedded as shown by the chain double-dashed line in FIG. If the length of one pile main body 2 is not enough, the rotary joint 9 is removed and another pile main body 2 is added by welding to continue the work.

Next, after the excavation head 3 reaches a predetermined depth, the pipe pile 1 is further repeated within an angle smaller than (360 degrees / number of excavation blades), that is, an angle smaller than 120 degrees in the embodiment. While rotating (preferably in small steps), the excavating blade 6 is press-fitted by an amount corresponding to the height. If the excavating head 3 is press-fitted while being repeatedly rotated in this manner, the excavating blade 6 enters a state of cutting into the bottom surface of the hole H rather than cutting it.
When the support substrate 4 is grounded by press-fitting up to the height corresponding to, the strength is dramatically improved.

Next, the rotary joint 9 attached to the upper end of the pile main body 2 is removed to complete the construction of the pipe pile 1.

Although the present invention has been described with reference to the embodiments, the present invention is of course not limited to the above embodiments. For example , the number of blades of the excavating head 3 is optimal in terms of cost and strength among the three blades of the embodiment, but it is not necessary to limit it.

[0022]

In the pipe pile used in the construction method of the present invention, the excavating head has a rotary fulcrum member and rotates accurately about the fulcrum, so that it can be press-fitted at a desired point with high accuracy. In addition, the excavated soil moves toward the outer periphery of the excavation head because the excavation blade is inclined at an acute angle with respect to the radiation, and the excavated soil is formed because the front face of the blade and the support substrate form an acute angle. Moves upwards. Therefore, the excavated soil smoothly comes out from the earth discharging space between the hole and the support substrate to the upper surface side of the support substrate to backfill the hole, so that the efficiency and workability are very good.

According to the present invention, however, after the pipe pile is rotated, the pipe pile is press-fitted into the ground to reach a predetermined depth, and then the pipe pile is further moved within an angle range smaller than (360 degrees / the number of excavating blades). in it is so arranged height of digging edge while repeating rotation equivalent to pressed to fix, Nde write eating drilling blade on the bottom of the hole supporting
The holding substrate is grounded. Therefore, the pipe pile has the highest strength.

According to the rotary press-fitting construction method of claim 2,
For example, you can fix the drilling blade by cutting it into the bottom of the hole.
Therefore, the strength of the pipe pile is dramatically improved.

[Brief description of drawings]

FIG. 1A is a front view showing a main part of a pipe pile, and FIG. 1B is a bottom view of the pipe pile.

FIG. 2 is a front view showing a usage state.

FIG. 3 is a partially enlarged front view showing a main part.

FIG. 4 is a front view showing a conventional pipe pile.

[Explanation of symbols]

1… Pipe pile 2… Pile-based 3 ... Drilling head 4 ... Support substrate 5 ... Rotation fulcrum member 6 ... Drilling blade 6a ... Horizontal part 6b ... tapered portion 7… Excavation space Z ... Ground L ... Radiation H ... hole

Continued front page       (56) References JP-A-5-311649 (JP, A)                 JP-A-60-37327 (JP, A)                 Japanese Patent Laid-Open No. 11-303069 (JP, A)                 JP 62-296014 (JP, A)                 JP 58-26116 (JP, A)                 55-54445 (JP, U)                 Registered utility model 3008369 (JP, U)

Claims (2)

(57) [Claims] 1. The following a to e configurations are provided at the tip of the tubular pile main body.
Using a pile of pipes equipped with a drilling head with
The method of rotary press-fitting pipe piles that meets the requirements of . a. The drilling head consists of a plate-shaped support board that is attached to the tip of the pile, and a pointed tip that projects from the lower surface of the center of the support board.
It is composed of a triangular plate-shaped rotary fulcrum member that pierces the ground and a plate-shaped excavating blade that is provided on the lower surface of the support substrate. b. The excavating blades are provided one by one corresponding to a plurality of radiations at equal intervals from the center of rotation of the support substrate, and have an acute inclination with respect to the radiations. c. The drilling blade has an acute inclination between the front surface of the blade and the lower surface of the support substrate. d. The digging blade is a large protrusion protruding outside the outer peripheral edge of the support substrate.
By setting the of come, you to allow earth removal space between the inner circumferential surface and the supporting substrate of the drilled hole in the digging edge. e. The rotation direction of the pipe pile is set so that the soil excavated by each inclination of the excavation blades is sent from the soil discharge space to the upper surface side of the support substrate. x. While rotating the pipe pile, press it into the ground and
Reach y. In addition, the pipe pile has an angle smaller than (360 degrees / number of drilling blades)
While repeatedly rotating within the range of degrees, press-fitting is equivalent to the height of the drilling blade.
Let 2. The cutting edge of the excavating blade has a horizontal portion and a tapered portion.
The rotating pressure of the pipe pile according to claim 1, which has a shape in which
Entering method .