JP3817285B2 - Building foundation pile driving method and steel pipe pile connection pin used for it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile driving method for supporting a foundation of a building from below and a connection pin for a steel pipe pile used therefor.
[0002]
[Prior art]
In the case of reinforced concrete construction, large-diameter piles are mainly used as the construction method to support the foundation of the building below and prevent consolidation settlement in soft ground, and in many cases, examples are driven by striking from above. There were many. However, in consideration of the effects of noise and vibration on the vicinity, recently there has been a prior digging method in which a buried hole is dug in advance by a rotary cutting device such as an auger, a pile is inserted therein, and cement milk is poured and hardened. Has been done. In the case of a building having a total weight of about 150 tons such as a wooden house, the above construction method is excessive and generally not performed. As a construction suitable for such construction, it is preferable to use a steel pipe pile with a small diameter for the portion where the fabric foundation is provided and to support it below.
[0003]
[Problems to be solved by the invention]
In order to embed steel pipe piles in the ground, auger combined driving is generally performed. This construction method has problems associated with the above-mentioned noise and vibration, and also has a small diameter and a problem of workability when embedding a large number of pipes. Accordingly, without damaging the environment in the vicinity of the construction site in the present invention, easily and good work efficiency was studied connecting pin of the steel pipe pile used therefor and building foundation pile construction method.
[0004]
[Means for Solving the Problems]
As a result of examining the above issues, the steel pipe pile is rotationally press-fitted to the required depth by the rotary press-fitting device that connects the steel pipe pile installed on the foundation of the building to the upper part of the steel pipe pile, the cutting claw at the tip of the steel pipe pile, and the guide blade on the upper part. In the construction method, the connection between the rotating rod of the auger and the steel pipe pile is the insertion holding part that is inserted and held in the rotating rod of the auger at the upper part of the intermediate flange, and the part that is inserted into the steel pipe pile at the lower part of the intermediate flange. carried by a connecting pin having, in the connecting pin has a fitting holding portion of the square that is fitted held auger at the top of the flange to the rotating rod, the tip is pointed columnar to be inserted into the steel pipe pile at the bottom of the flange An outer cylinder part is provided by providing a sufficient gap for inserting the steel pipe pile to the outer periphery of the guide part, and the guide part of the locking projection at the upper end part of the steel pipe pile and the holding in a bowl shape to the outer cylinder part. Part Using a structure in which a certain notch for coupling the rotation pressed steel pipe piles, performed by the weight and rotation of the auger provided in the ground auger, generally inclined in the rotational direction of the steel pipe pile with respect to the distal end of the steel pipe pile A building foundation pile driving method has been developed, in which the claw of the wedge-shaped piece is excavated and pressed by the cutting claw provided at equal intervals of the pipe body and by the spiral guide blades above the cutting claw. As an example of the rotary press-fitting device mentioned here, there can be mentioned a drilling machine generally called an earth auger that drills a hole from above into the ground while rotating with a motor.
[0005]
The steel pipe pile used in this construction method is a cutting claw in which the claw of the wedge-shaped piece is inclined at the tip of the steel pipe pile in the rotation direction of the steel pipe pile and is arranged at equal intervals in the pipe body, and the spiral guide above the cutting claw As a means for connecting the rotary press-fitting device to the base side with the blades, the vertical engagement of the pipe inner wall or the pipe outer wall for insertion into the locking projection of the connecting pin connected to the rotating rod of the auger or the connecting notch A stop projection is provided. Here, the structure of the connecting pin connected to the rotating rod of the auger is that the upper part of the flange has a square fitting holding part that fits into and holds the rotating rod of the auger, and the lower part of the flange has a part that is inserted into the steel pipe pile The surface is provided with a locking protrusion for locking to the locking protrusion of the steel pipe pile described above, or there is a rectangular insertion holding portion that is inserted and held on the rotating rod of the auger at the top of the flange A columnar guide part with a sharp tip inserted into the steel pipe pile at the lower part of the flange, and an outer cylinder part provided with a gap sufficient for the steel pipe pile to be inserted into the outer periphery of the columnar guide part. A connecting pin for connecting a steel rod pile and a rotating rod of an auger provided with a notch for connection as a guide portion of a locking projection at the upper end portion of the pile and a holding portion connected to the hook can be used.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of the building foundation pile driving method. The steel pipe pile 1 is being buried in the ground before it is installed on the foundation of the building. An auger 2 is provided as a rotary press-fitting device on the upper part of the steel pipe pile 1 so as to be movable up and down by a support column 3, and the steel pipe pile is buried by the rotation of the auger and its own weight. The support 3 is supported by a wheel crane or the like. As shown in FIG. 2, the steel pipe pile 1 is provided with a cutting claw 4 characterized by the present invention at its tip and a spiral guide blade 5 at the top thereof. The details can be seen in FIG. The cutting claw 4 is provided with approximately three wedge-shaped pieces at equal intervals in the tube. On the other hand, the details of the base side are shown in FIGS. 4 and 5, but in the example of FIG. 4, two locking protrusions 6 are provided on the pipe inner wall as connecting means on the steel pipe side for enabling rotation by the auger to the upper end inner wall of the steel pipe pile. , 6 are provided, and in the example of FIG. 5, two locking projections 13, 13 are provided on the pipe outer wall. The cutting claw 4, the spiral guide blade 5 and the locking projection 6 are welded to a commercially available steel pipe pile.
[0007]
A connecting pin 8 is interposed between the rotating rod 7 of the auger and the steel pipe pile 1 as a connecting means for the locking projections 6, 6. The details can be seen in FIGS. 4 and 5. In the example of FIG. 4, there is a portion to be inserted into the steel pipe pile 1 at the bottom of the flange 9, and the surface is locked to the above-described locking projections 6 and 6 of the steel pipe pile 1. Two locking protrusions 11 and 11 are provided. In particular, in the example of FIG. 5, a columnar guide portion 15 having a sharp tip inserted into the steel pipe pile 1 at the lower portion of the flange 9 and a sufficient space for inserting the steel pipe pile 1 on the outer periphery thereof are provided. 14, and a connecting cutout 16 including a guide portion 16 a of the locking projection 13 at the upper end portion of the steel pipe pile and a holding portion 16 b connected to the flange shape is provided on the outer cylinder portion 14. At the upper part of the flange 9, there is a hexagonal insertion holding part 12 which is inserted into and held by the rotating rod 7 of the auger. Since the columnar guide portion 15 having a sharp tip inserted into the steel pipe pile 1 shown in FIG. 5 and the outer cylinder portion 14 are provided with a gap sufficient to insert the steel pipe pile 1 on the outer periphery thereof . The steel pipe pile 1 can be simply connected to the rotating rod 7 of the auger simply by inserting the insertion holding portion 12 of the connecting pin 8 fitted to the upper portion of the steel pipe pile 1 into the connection hole of the rotating rod 7 of the auger. be able to.
[0008]
After connecting the steel pipe pile 1 set up to the required position on the rotating rod 7 of the auger and rotating the auger, the steel pipe pile 1 is rotated by the action of the weight of the auger, the cutting claw 4 and the spiral guide blade 5. Ground cutting is performed, and steel pipe piles can be easily embedded. If the length of one steel pipe pile is insufficient, the required length can be satisfied by welding a steel pipe pile of an appropriate length to the upper part.
[0009]
FIG. 6 shows a state where the steel pipe pile 1 is piled on the lower part of the cloth foundation in the wooden house by the building foundation pile driving method of the present invention. Since the steel pipe pile 1 has an outer diameter of 165.2 mmφ and an inner diameter of 150 mmφ and a load resistance of 6 to 7 tons, it is necessary to drive about 30 piles in a 150 t wooden house. According to the present invention, one steel pipe pile having a length of 12 m can be piled in 2 to 3 minutes, so that the entire pile driving can be completed in 2 to 3 hours, and the present invention has achieved high efficiency. I understand that. In this way, work efficiency is improved and there is no noise or vibration, so there is no adverse effect near the construction site. Steel pipe piles with a diameter of about 500 to 100 mmφ can be used, so they are appropriately selected according to the weight of the building and the softness of the ground.
[0010]
【The invention's effect】
The present invention, therefore also added a further improved method to stake the ground cutting while rotating the conventional steel pipe pile, vibration, there is no impact on the environment due to noise or the like. Since no cement, bentonite, soil conditioner, etc. are used, there is no secondary pollution. Since ground cutting is not ground excavation, the ground around the pile and the ground at the tip of the pile are not deteriorated. In addition, pile driving can be completed in a short time. The fixed method using cement milk requires residual soil treatment by excavation, but a method that can solve such difficulties can be effectively implemented by the present invention.
[Brief description of the drawings]
FIG. 1 is a side view when a building foundation pile driving method is carried out.
FIG. 2 is a perspective view of a steel pipe pile.
FIG. 3 is a perspective view of a steel pipe pile tip.
FIG. 4 is a perspective view of a steel pipe pile base and connection pins.
FIG. 5 is a perspective view of another embodiment of a steel pipe pile base and a connection pin.
FIG. 6 is a plan view showing a pile driving state of a steel pipe pile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2 Auger 3 Strut 4 Cutting claw 5 Guide blade 6 Locking protrusion 8 Connecting pin
13 Locking protrusion
14 Outer tube
15 Guide section
16 Notch for connection

Claims (2)

In the method of rotary press-fitting a steel pipe pile to the required depth by a rotary press-fitting device that connects the steel pipe pile installed on the foundation of the building to the upper part of the steel pipe pile and the cutting claw at the tip of the steel pipe pile and the guide blade on the upper part,
The connection between the auger's rotating rod and the steel pipe pile is a fitting pin that is inserted and held in the auger's rotating rod at the upper part of the intermediate flange, and has a portion that is inserted into the steel pipe pile at the lower part of the intermediate flange. The connecting pin has a rectangular insertion holding portion that is fitted and held in the rotating rod of the auger at the upper portion of the flange, and a columnar guide portion that has a pointed tip that is inserted into the steel pipe pile at the lower portion of the flange, An outer cylinder part is provided by providing a sufficient gap for the steel pipe pile to be inserted into the outer periphery, and the outer cylinder part is connected to the guide part of the locking projection at the upper end part of the steel pipe pile and the holding part connected to the bowl. Using a structure with a cut-out for the steel pipe, the rotary press-in of the steel pipe pile is performed by the rotation of the auger provided in the earth auger and its own weight, and the wedge-shaped piece inclined in the rotation direction of the steel pipe pile with respect to the tip of the steel pipe pile The nails of the tube etc. Building foundation pile construction method, characterized in that the cutting claw provided in septum position and drilling pressed by the helical guide vanes of 該切 Kezutsume top. The upper part of the flange has a square fitting holding part that fits into and holds the rotating rod of the auger. The lower part of the flange has a columnar guide part with a pointed tip that is inserted into the steel pipe pile, and the steel pipe pile is inserted into the outer periphery of the guide part. An auger having an outer cylinder portion provided with a sufficient gap, a guide portion of a locking projection at the upper end portion of the steel pipe pile, and a connection notch that is a holding portion connected in a bowl shape to the outer cylinder portion. Steel pipe pile connecting pin that connects the rotating rod and steel pipe pile.

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