JP4157861B2 - Rotating penetrating steel pipe pile - Google Patents

Description

  The present invention relates to a rotary penetrating steel pipe pile provided with a spiral blade having an outer diameter larger than the diameter of the steel pipe at the tip of the steel pipe.

A rotation penetration steel pipe is a pile which provided the blade of various shapes at the tip of a steel pipe pile main part, and rotates and penetrates in the ground by giving a rotational force to a steel pipe pile main part. As the existing rotary penetrating steel pipe piles, a closed-end pile whose tip is closed with a lid and blades and an open-end pile where the pile tip is open and soil and sand enters the pile during construction have been developed.
In recent years, paying attention to the increase in diameter and ease of installation of underground steel pipe piles in the underground, the internal space is being used as a heat storage space for underground heat or as a space for melting snow in snowy areas. Research is ongoing.
JP 2002-105954 A

  From the viewpoint of using the internal space of the rotating penetrating steel pipe piles, the open-ended piles are filled with earth and sand during construction, and the available internal space becomes smaller. After installation, there was a problem that it was necessary to remove the soil that had entered.

  On the other hand, in closed-end piles, there is no penetration of excavated soil into the pile body during construction, and it is considered advantageous to use the internal space, but the penetration resistance during construction is large, depending on the conditions of the ground The workability was very poor, and this tendency had a problem that it became prominent as the pile diameter increased.

  An object of the present invention is to provide a rotary penetrating steel pipe pile that has solved the above-described problems of the prior art, has good penetration during construction, and reduces or eliminates the entry of earth and sand into the pile body.

In order to solve the above-mentioned problem, the first invention of the present invention is a steel pipe pile main body having a spiral notch at the tip, and a spiral shape fixed to the tip of the steel pipe pile main body in a shape corresponding to the spiral notch. The spiral blade extends in the inner and outer direction of the steel pipe pile body, and a sufficient gap is formed between the inner protrusions of the spiral blade during construction so as to allow the entry of earth and sand into the steel pipe pile body. An earth and sand inlet portion communicating with the gap is formed between the terminal end portion and the starting end portion of the spiral blade, and the earth and sand is attached to the side surface of the tip portion of the steel pipe pile body to which the spiral blade is fixed. A side opening for moving the outer side of the spiral blade, the side opening having the upper surface of the spiral blade as a lower end, and forming one or a plurality of side openings separate from the earth and sand inlet It is characterized by.

  The second invention is characterized in that, in the rotary penetration steel pipe pile of the first invention, a lid member is fixed inside the steel pipe pile main body above the side opening.

  The third invention is characterized in that, in the rotary-penetrating steel pipe pile of the first invention, a ring member that suppresses entry of earth and sand into the steel pipe pile main body is fixed inside the steel pipe pile main body above the side opening. And

This 4th invention is the rotation penetration steel pipe pile of this 1st invention, The earth-and-sand guide extended in the radial direction inside a steel pipe pile main body from the edge part vicinity of the side far from the starting end part of the helical blade | wing in the said side surface opening part. a plate, and characterized in that fixing the sediment was scooped up by the helical blade tip to the tip inside the steel pipe pile body the soil guide plate for guiding the side opening, the upper surface of the inner wall and the helical blade of the steel pipe pile body To do.

  This 5th invention is the rotation penetration steel pipe pile of this 4th invention, The said earth-and-sand guide plate is weld-fixed to the inner side protrusion part in the steel pipe pile main body of a spiral blade, and the inner wall part of a steel pipe pile main body. And

  The sixth invention is characterized in that, in the rotary penetrating steel pipe pile of the fourth or fifth invention, a lid member is fixed inside the steel pipe pile main body above the earth and sand guide plate.

  In this 7th invention, in the rotation penetration steel pipe pile of this 4th invention or 5th invention, the ring member which suppresses the entrance of the earth and sand to the steel pipe pile main body inside the said steel pipe pile body above the earth and sand guide plate is fixed. It is characterized by.

Instead of forcing the earth and sand on the lower surface of the shaft part of the steel pipe pile body to the outer periphery of the pile by forming a side opening that is separate from the earth and sand inlet part on the steel pipe pile body on the tip of the spiral blade of the present invention. Because the sand and sand that has entered the pile are scooped up by the blades projecting inside the pile body and moved to the outside of the pile through the side opening, there is little penetration resistance and The amount of earth and sand entering can be reduced.
In addition, the lid member installed inside the steel pipe pile main body at the top of the side opening or the ring body that suppresses the ingress of earth and sand is fixed so that the earth and sand can enter the upper part of the pile body without increasing the penetration resistance. Can be blocked.
In addition, a side opening is formed at the tip of the steel pipe pile body to which the spiral blade is fixed,
A sand and sand guide plate extending in the radial direction inside the steel pipe pile main body from the vicinity of the end vertical portion on the side far from the starting end of the spiral blade in the side opening, and scooped up with the spiral blade tip inside the tip of the steel pipe pile main body The earth and sand guide plate that guides the earth and sand to the side opening is fixed to the inner wall of the steel pipe pile body and the upper surface of the spiral blade, so that the earth and sand that has entered the pile can be moved more efficiently to the outside of the pile through the side opening. Can be made.
In addition, the earth and sand guide plate is welded and fixed to the inner projecting portion of the spiral blade inside the steel pipe pile main body and the inner wall portion of the steel pipe main body, thereby reducing the strength due to the cross-sectional defect of the opening formed at the lower end of the pile. Reinforce.
In addition, a lid member installed inside the steel pipe pile main body above the earth and sand guide plate or a ring body that suppresses the ingress of earth and sand is fixed to prevent the entry of earth and sand into the upper part of the pile without increasing penetration resistance. Can be possible.

  FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a perspective view showing another embodiment of the present invention, and FIG. 3 is a perspective view showing still another embodiment of the present invention. It is.

  As shown in FIG. 1, in the rotary penetrating steel pipe pile 1, a spiral cut portion 4 is formed at the tip of the steel pipe pile body 2, and the spiral blade 3 is fixed to the spiral cut portion 4. The spiral blade 3 is made of a disk-shaped steel plate and protrudes outward and inward of the steel pipe pile main body 2.

The outer diameter of the spiral blade 3 is 1.2 to 3.0 times the outer diameter of the steel pipe pile main body 2, and the entry of earth and sand is allowed at the tip of the steel pipe pile main body 2 between the inner projecting portions 14 of the spiral blade 3. A gap 13 is formed.

The angle between the end portion 5 and the start end portion 6 of the spiral blade 3 is approximately 60 degrees, and an earth and sand inlet portion 7 is formed between the end portion 5 and the start end portion 6. The steel pipe pile main body 2 communicates with the gap formed by the space between the inner protrusions 14 of the spiral blade 3.

  A side opening 8 is formed in the steel pipe pile body 2 in the vicinity of the starting end 6 of the spiral blade 3. The side opening 8 is formed so as to have a predetermined height in the axial direction of the steel pipe pile main body 2 and a predetermined width in the circumferential direction of the steel pipe pile main body 2 from the upper surface 3a in the vicinity of the starting end portion 6 of the spiral blade 3. .

  It extends in the radial direction inside the steel pipe pile main body 2 from the vicinity of the end portion 5 side end portion of the spiral blade 3 of the side surface opening 8 (in the vicinity of the vertical portion of the side surface opening 8 far from the start end portion 6). The earth and sand guide plate 9 is installed. The earth and sand guide plate 9 has its lower end fixed to the upper surface of the inner projecting portion in the steel pipe pile main body 2 of the spiral blade 3 by welding, and both ends fixed to the inner wall 2a of the steel pipe pile main body 2 by welding. When the rotationally penetrating steel pipe pile 1 configured in this manner is rotationally driven by a driving means such as a full swirler, the steel pipe pile main body 2 is rotationally press-fitted into the ground by the spiral blade 3 at the tip. The earth and sand picked up by the lower end portion of the spiral blade 3 enters the steel pipe pile main body 2 from the earth and sand inlet 7, but is guided to the side opening 8 by the earth and sand guide plate 9, and outside the steel pipe pile main body 2. It moves, moves on the upper surface of the spiral blade 3, and is transferred to the upper part. Since the earth and sand on the lower surface of the spiral blade 3 smoothly moves out of the steel pipe pile main body 2, the penetration is improved, and the earth and sand that has entered the steel pipe pile main body 2 also moves out of the steel pipe pile main body 2 from the side opening 8. Therefore, earth and sand do not accumulate inside the steel pipe pile main body 2. The earth and sand guide plate 9 also has a function of reinforcing a cross-sectional defect of the side opening 8 formed in the steel pipe pile main body 2.

The lid member 10 may be fixed to the inner wall portion 2a of the steel pipe pile main body 2 by welding on the upper part of the earth and sand guide plate 9 inside the steel pipe pile main body 2. By installing the earth and sand guide plate 9 and forming the side opening 8 in the steel pipe pile main body 2, the accumulation of the earth and sand under construction in the steel pipe pile main body 2 is suppressed, but depending on the type of ground, Since partial earth and sand may accumulate in the steel pipe pile main body 2, the lid member 10 is installed in order to prevent this.
The lid member 10 may be formed with air and drain holes 11 as necessary. If the air and drain holes 11 are provided, the air in the lower space of the lid member 10 can be prevented from being compressed during the construction. Further, when the air and drain holes 11 are provided, water enters the pile body above the lid member 10. This can prevent the pile body from being lifted by buoyancy during the construction of the pile.

  In the embodiment shown in FIG. 2, instead of the lid member 10, a ring member 12 that suppresses entry of earth and sand into the steel pipe pile main body 2 is welded to the inside of the steel pipe pile main body 2 above the earth and sand guide plate 9. It is fixed. The ring member 12 also has the same function as the lid member 10. After the construction, the bottom plate of the internal space of the steel pipe pile main body 2 is formed by welding a lid member on the ring member 12.

  In addition, the ring member 12 is provided in the steel pipe pile main body above the side surface opening part 8 like illustration.

  In each of the above embodiments, the earth and sand guide plate 9 is provided to reinforce the rigidity of the steel pipe pile main body 2 due to the cross-sectional defect of the side opening 8 formed in the steel pipe pile main body 2, but in the case of a snow melting device, Since almost no support force is required or a small support force is required, it is not necessary to provide the earth and sand guide plate 9 as in the above-described embodiment, and the side surface without the earth and sand guide plate 9 as shown in FIG. 3 or FIG. An opening 8 may be provided. FIG. 3 shows a case where one side opening 8 is provided. As shown in FIG. 4, in addition to the side opening 8 (8a), the steel pipe pile main body 2 is further provided on the lower side of the lid member 10. You may provide the side surface opening part 8 (8b) at intervals in the circumferential direction. Thus, if the some side surface opening part 8 (8a, 8b) is provided, the accumulation in the steel pipe pile main body 2 of the earth and sand under construction will be suppressed further.

  As in the above-described embodiment, at least one side opening 8 is provided at the tip of the steel pipe pile body 2 to which the spiral blades are fixed, or a plurality of two (in the case of illustration) or more are provided, so that the steel pipe is provided. Rather than forcibly pushing out the soil on the lower surface of the shaft portion of the pile body 2 to the outer periphery of the pile, it is made to enter the pile positively, and the sand that has entered the pile is scooped up by the blade portion projecting inside the pile body to open the side surface. Since it moves to the pile outer side through 8 (a, b), there is little penetration resistance of a pile and the amount of earth and sand approaching into the upper part inside a pile can be reduced.

Although illustration is omitted as a modification of FIG. 3, the lid member 10 may be provided with air and drain holes 11, the ring member 12 may be substituted for the lid member 10, and the earth and sand guide plate 9 may be provided. This is a modification of FIG.

It is a perspective view which shows one Embodiment of this invention. It is a perspective view which shows other embodiment of this invention. It is a perspective view which shows other embodiment of this invention. It is a perspective view which shows other embodiment of this invention.

Explanation of symbols

1 rotation penetration steel pipe pile 2 steel pipe pile body 3 spiral blade 4 helical notch 5 spiral blade end portion 6 helical blade beginning 7 sand inlet portion 8 side opening 9 Sediment guide plate 10 lid member 11 air and water Hole 12 Ring member 13 Gap 14 Inner protrusion

Claims (7)

A steel pipe pile body having a spiral notch at the tip; and a spiral blade fixed to the tip of the steel pipe pile body in a shape corresponding to the spiral notch, the spiral blade being a steel pipe pile body A sufficient gap is formed between the inner projecting portions of the spiral blades, and extends between the inner and outer protrusions of the spiral blades. A sand and sand inlet portion communicating with the gap is formed between the tip side surfaces of the steel pipe pile main body to which the spiral blades are fixed, and a side opening for moving the earth and sand to the outside of the steel pipe pile main body, A rotary penetrating steel pipe pile characterized in that one or a plurality of side surface opening portions different from the earth and sand entrance portion are formed by a side surface opening portion having an upper surface of the spiral blade as a lower end .   The rotating penetration steel pipe pile according to claim 1, wherein a lid member is fixed inside the steel pipe pile main body above the side opening.   The rotary penetrating steel pipe pile according to claim 1, wherein a ring member that suppresses entry of earth and sand into the steel pipe pile main body is fixed inside the steel pipe pile main body above the side opening. A sand and sand guide plate extending in the radial direction inside the steel pipe pile main body from the vicinity of the end vertical portion on the side far from the starting end of the spiral blade in the side opening , and scooped up with the spiral blade tip inside the steel pipe pile main body tip The rotary penetrating steel pipe pile according to claim 1, wherein the earth and sand guide plate for guiding the earth and sand to the side opening is fixed to the inner wall of the steel pipe pile main body and the upper surface of the spiral blade .   5. The rotary penetrating steel pipe pile according to claim 4, wherein the earth and sand guide plate is welded and fixed to an inner projecting portion in the steel pipe pile main body of the spiral blade and an inner wall portion of the steel pipe pile main body.   The rotary penetrating steel pipe pile according to claim 4 or 5, wherein a lid member is fixed inside the steel pipe pile main body above the earth and sand guide plate.   The rotary penetrating steel pipe pile according to claim 4 or 5, wherein a ring member for suppressing entry of earth and sand into the steel pipe pile main body is fixed inside the steel pipe pile body above the earth and sand guide plate.