JP2015063792A - Small-diameter connection pipe pile with blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-diameter connection pipe pile with a blade in which a pipe pile is easily connected in a short time, and which is easily intruded by pressing force or rotation and easily pulled out when removing irrespective of sand ground or clayish ground.SOLUTION: A small-diameter connection pipe pile with a blade includes: a small-diameter single pipe pile 2 having through-holes 10, 11 with a blade, in which a one-turn or multi-turn spiral blade 4 protrudes on an outer periphery near the lower end of a pipe body 9 made of a steel pipe; a small-diameter single pipe pile having at least a through-hole below the small-diameter single pipe pile 2 with the blade; a pipe-like or circular columnar shape pipe pile joint 6 having an outer diameter so that its outer peripheral wall surface is in contact with the inner peripheral wall surface of a pile body, and having at least two through holes 12, 13 in the same direction orthogonal to the longitudinal direction, on the lower edge side of the pile body; and bolts and nuts inserting the through-holes on the upper part side of the small-diameter single pipe pile and on the lower part side of the pipe pile joint, and inserting the through-holes on the lower part side of the small-diameter single pipe pile having the blade and on the upper part side of the pipe pile joint to fasten them.

Description

  The present invention relates to a bladed small-diameter connecting pipe pile having a diameter of 100 mm or less, which is inserted into a ground such as a sandy ground or a viscous ground while being pressed or rotated.

  As a steel pipe pile that is driven into the ground while rotating, for example, Patent Document 1 discloses a small-diameter steel pipe that is pressed into a solid ground by adding a small-diameter steel pipe in order to restore the building horizontally and prevent future subsidence. A technique of a small-diameter steel pipe pile having a male joint at one end of a steel pipe and a female joint joined to the male joint at the other end is disclosed.

JP 2011-52396 A

  However, when the blades are fixed to the invention described in Patent Document 1, it takes a long time to connect because of the screw structure, or when screwing in while rotating into the ground, the screwing portion is in the tightening direction. When pulling out the pipe pile that has penetrated into the ground, the threaded part tends to loosen because it rotates in the opposite direction.

  The present invention was devised in view of these problems, and it is easy to connect pipe piles in a short time, and it is easy to penetrate by pressing or rotating regardless of sandy ground or viscous ground, and is small with blades that can be easily pulled out when removed. It aims at providing a caliber pipe pile.

  The invention of the small-diameter connecting pipe pile 1 with a blade according to claim 1 is characterized in that a spiral blade 4 of one or several turns is provided on the outer periphery in the vicinity of the lower end of a pile body 9 made of steel pipe, A small-diameter single-pipe pile with blades 2 provided with at least one through-holes 10 and 11 in the same direction in the direction perpendicular to the longitudinal direction at the vicinity of the upper and lower edges of the main body 9, Under the winged small-diameter single-pipe pile 2, it has the same outer diameter and inner diameter as the winged small-diameter single-pipe pile 2, and at least the same as the through-hole 11 of the winged small-diameter single-pipe pile 2 A small-diameter single-pipe pile 3 having a through-hole 11 having a hole diameter, and an outer diameter at which the outer peripheral wall surface is in contact with the inner peripheral wall surface of the small-diameter single-pipe pile 2 with blades on the lower edge side of the small-diameter single-pile pile 2 with blades. Or a pipe-like or columnar shape having an inner circumference on the outer peripheral wall surface of the bladed small-diameter single-pipe pile 2 A pipe pile joint 6 having an inner diameter with which the surface is in contact and having at least two through holes 12, 13 perpendicular to the longitudinal direction and in the same direction, and the upper end of the small-diameter single pipe pile 3 A bolt 14 and a nut which are inserted and fastened through a through hole 11 on the side of the pipe and a through hole 13 on the side of the lower end of the pipe pile joint 6; and a through hole 10 on the lower end side of the small-diameter single pipe pile 2 with blades. And a bolt 14 and a nut which are inserted and fastened through the through hole 12 on the upper end side of the pipe pile joint 6.

  The invention of the small-diameter connecting pipe pile 1 with a blade according to claim 2 is the invention according to claim 1, wherein the spiral blade 4 of one or several turns is provided on the outer periphery in the vicinity of the lower end of the single-tube pile 3 with a small diameter. It is characterized by protruding.

  The invention of the bladed small-diameter connecting pipe pile 1 according to claim 3 is the notch for cutting the outer peripheral wall surface including the lower peripheral edge on the lower end side of the small-diameter single pipe pile 3 in claim 1 or 2. 5 is provided.

  In the invention of the small-diameter connecting pipe pile 1 with a blade according to claim 1, the operation of connecting the single pipe pile is performed in such a manner that the pipe 14 and the pipe 14 are arranged between the pipe piles arranged in the vertical direction. Since it is the operation | work fastened with a nut, there exists an effect that a connection work can be performed easily.

  When the small-diameter connecting pipe pile 1 with blades is penetrated into the sandy or clayey ground, the small-diameter connecting pipe pile 1 with feathers is inserted into the sandy or clayey ground and then pulled out for removal. Sometimes, there is an effect that the connecting portion is not loosened.

  A small diameter single pipe pile 2 with a blade disposed at least on the upper side of the small diameter connecting pipe pile 1 with a blade is provided with a spiral blade 4 of one or several turns so that the small diameter connection with the blade is provided. Although it is predicted that the bladed small-diameter connecting pipe pile 1 will sink due to the compressive load from the photovoltaic power generation panel, structure or building on the upper end of the pipe pile 1, The bladed small-diameter connecting pipe pile 1 is less likely to sink with respect to a vertical load due to contact pressure.

  Further, the bladed small-diameter single-pipe pile 2 disposed on at least the upper side of the bladed small-diameter connecting pipe pile 1 is provided with one or several spiral spiral blades 4 so as to project the blades 4. Since the soil weight W1, W2 and W3 in the range of the internal friction angle φ is added to the upper part of the top, even if there is a force to lift the photovoltaic power generation panel installed obliquely by a strong crosswind, for example, Even in soft ground, it is possible to effectively overcome the force of pulling out by the strong crosswind on the bladed small-diameter connecting pipe pile 1 by the soil weight W1, W2 or W3. It is possible to prevent the connection pipe pile 1 from being pulled out by a strong crosswind.

  When the small-diameter single-pipe pile 3 arranged on the lower side is a pipe-like single-pipe pile 7 that does not have the blades 4, for example, in the case of a clayey ground such as a Kanto loam or a fill layer, the blades 4 When there is a small diameter single pipe pile, the cavity formed by the blades 4 projecting around the small diameter single pipe pile 3 is not buried due to the clay soil 15 and the cavity remains. 3 cannot penetrate the winged small-diameter connecting pipe pile 1 due to the crosswind or the like, but the outer peripheral surface of the pipe-like single pipe pile 7 and the clay soil 15 are formed as shown in FIG. Since the adhesive force C from the clay soil 15 is generated on the outer peripheral surface of the pipe-shaped single pipe pile 7 when in contact, the bladed small-diameter connecting pipe pile 1 having the pipe-shaped single pipe pile 7 is provided. Pulling out the bladed small-diameter connecting pipe pile 1 after the penetration due to a strong crosswind can be prevented.

  The invention of the bladed small-diameter connecting pipe pile 1 according to claim 2 is the same as the bladed small-diameter single-pipe pile 2 disposed on the upper side of the small-diameter single-pipe pile 3 disposed on the lower side. Or it is the small diameter single pipe pile 3 which protruded the spiral blade | wing 4 of several turns. Since the blades 4 are provided in at least two locations of the bladed small-diameter connecting pipe pile 1, even if the sand is a soft ground with a low sand density, the blades 4 as shown in FIG. Since the weight of sand soil W2 and W3 within the range of the internal friction angle φ is added to the top of the slag, even if it is a soft ground with a sandy system and low sand density, after the bladed small-diameter connecting pipe pile 1 has penetrated It is possible to prevent the bladed small-diameter connecting pipe pile 1 from being pulled out by a strong crosswind.

  Further, in the case of a soft ground with a sandy system and a low sand density, the blades are attached to the upper end of the bladed small-diameter connecting pipe pile 1 by a compressive load from a photovoltaic power generation panel, a structure, a building, or the like. Although it is predicted that the small-diameter connecting pipe pile 1 will sink, even in the soft ground where sand density is low and the sand density is low, the load in the vertical direction is caused by the ground pressure on the bottom surface of the blade 4 at least in two places. On the other hand, the bladed small-diameter connecting pipe pile 1 has an effect that it is difficult to sink.

  The invention of the small-diameter connecting pipe pile 1 with a blade according to claim 3 is provided with a notch 5 for cutting an outer peripheral wall surface including a lower peripheral edge on the lower end side of the small-diameter single pipe pile 3 arranged on the lower side. Due to the provision, the soil has different soil density depending on the age group, and hard and soft layers are laminated, but even if it touches the hard layer with high soil density, it can be easily penetrated by the notch 5 There is an effect that can be made.

It is composition explanatory drawing of the small diameter connecting pipe pile with a blade | wing of this invention. It is a schematic diagram in the case of the small diameter connecting pipe pile with a blade | wing of this invention and a lower side is a pipe-shaped small diameter single pipe pile. It is an outline figure in the case of a small diameter single pipe pile with a wing with a small diameter connecting pipe pile with a wing of the present invention. It is a schematic diagram in the case of the small diameter single pipe pile with a blade | wing with which the lower side provided the notch in the small diameter connection pipe pile with a blade | wing of this invention. It is a schematic diagram of a small diameter single pipe pile with a blade provided with two through holes. It is a pipe pile joint where the outer peripheral wall surface is in contact with the inner peripheral wall surface of the pipe pile, (a) is a pipe type, (b) is a cylindrical type, (c) is a schematic diagram of a pipe type in which an annular protrusion is formed in the center. is there. It is a pipe pile joint which an inner peripheral wall surface contacts the outer peripheral wall surface of a pipe pile, (a) is a pipe type which has a partition part in the center part, (b) is a schematic diagram of a pipe type. It is a schematic diagram of a notch, (a) is a triangular cutout, (b) is an explanatory view showing a plurality of triangular cutouts that are jagged. It is a schematic diagram of a pipe-shaped small diameter single pipe pile. It is a schematic diagram of the small diameter single pipe pile with a blade | wing. It is a schematic diagram of the small diameter single pipe pile with a blade | wing provided with the notch. It is explanatory drawing of the state which penetrated the pipe pile which the small diameter single pipe pile with a blade | wing and the pipe-shaped single pipe pile connected. It is explanatory drawing of the state which penetrated the small diameter single pipe pile with two blade | wings connected with sand in soft ground.

  As shown in FIGS. 1 to 4, the invention of the small-diameter connecting pipe pile 1 with blades according to the present invention is a spiral blade of one or several turns on the outer periphery in the vicinity of the lower end portion of the steel pipe-made pile body 9. 4 is provided with at least one through-hole 10 and 11 in the same direction in the direction perpendicular to the longitudinal direction at the vicinity of the upper and lower end edges of the pile body 9 and provided with at least one bladed blade. A single-pipe pile 2 having a caliber has the same outer diameter and inner diameter as the small-pipe single-pipe pile 2 with a blade on the lower side of the single-pile pile 2 with a blade, and at least the small-pipe single-pipe pile with a blade Small-diameter single-pipe pile 3 having a through-hole 11 having the same diameter as two through-holes 11, and the inner periphery of the small-diameter single-pipe pile 2 with blades on the lower end edge side of the small-diameter single-pipe pile 2 with blades A pipe or cylinder having an outer diameter that is in contact with the wall surface of the outer peripheral wall surface, or the bladed small diameter unit A pipe pile joint 6 having an inner diameter in contact with the outer peripheral wall surface of the pile 2 and having at least two through-holes 12, 13 perpendicular to the longitudinal direction and in the same direction; Bolts 14 and nuts that are inserted and fastened through the through hole 11 on the upper end side of the small-diameter single-pipe pile 3 and the through-hole 13 on the lower end side of the pipe pile joint 6, and the small-diameter single-pipe pile 2 with blades The bolt 14 and the nut which are inserted and fastened through the through hole 10 on the lower end side of the pipe and the through hole 12 on the upper end side of the pipe pile joint 6 are provided.

  In the case of a configuration in which two pipe piles are connected, the configuration of the winged small-diameter connection pipe pile 1 as shown in FIGS. 1 to 4 is such that the winged small-diameter single pipe pile 2 as shown in FIG. A small-diameter single-pipe pile 3 as shown in FIGS. 9 to 11 is provided on the lower side, and the bladed small-diameter single-pipe pile 2 and the small-diameter single-pipe pile 3 are connected to each other. 6 or a pipe pile joint 6 as shown in FIG. And in the form of the said small diameter single pipe pile 3, the pipe-shaped single pipe pile 7 as shown in FIG. 9, the lower end edge as shown in FIG. 10 is a ring-shaped small diameter single pipe pile 8 with a blade, or There is a bladed small-diameter single-pipe pile 8 in which a part of the lower end edge as shown in FIG. And the said small diameter single pipe pile 8 with a blade | wing has a form substantially the same as the said small diameter single pipe pile 2 with a blade | wing, The difference with the said small diameter single pipe pile 2 with a blade | blade is the penetration of the lower end vicinity. There is a form in which the hole 10 is perforated, a form in which the through hole 10 is not perforated, a form in which the notch 5 is formed, and a form in which the notch 5 is not formed.

  The bladed small-diameter single-pipe pile 2 has a form as shown in FIG. 5, and the material of the pile body 9 of the bladed small-diameter single-pipe pile 2 may be a steel pipe, for example, as a structural round pipe Any general structural carbon steel pipe such as STK400 or STK500 may be used. Moreover, the magnitude | size of the pile main body 9 of the small diameter single pipe pile 2 with a blade | wing is a small diameter with a diameter of 48.6 mm as an example.

  Moreover, the through-holes 10 and 11 provided in the small diameter single pipe pile 2 with a blade | wing are used when connecting with another single pipe pile using the pipe pile joint 6. FIG. The said through-holes 10 and 11 are the positions of the vicinity from the upper-and-lower-ends edge part of the small diameter single pipe pile 2 with a blade | wing respectively, Comprising: At least one through-holes 10 and 11 of the same direction at right angles to a longitudinal direction It is provided one by one. In the case where a plurality of through holes 10 and 11 in the same direction are provided on the upper and lower ends, respectively, a single combination of the through holes 10 and 11 in the same direction on each of the upper and lower ends is used as a combination with respect to the longitudinal direction. The direction of the right-angle direction may be the same direction for all combinations of combinations consisting of one each of the through holes 10 and 11, and each of the combinations consisting of one each of the through holes 10 and 11. The direction may be different for each combination.

  Moreover, about the position of the said through-holes 10 and 11, about the through-hole 11 of each upper end side of the small diameter single pipe pile 2 with a full blade, or the all small diameter single pipe pile 3, it is vertical from each upper end edge part. The distance in the direction is the same, and the through hole 10 on the lower end side of the small-diameter single-pipe pile 2 with all blades is the same in the vertical direction from the lower end edge. The distance in the vertical direction from the upper edge and the distance in the vertical direction from the lower edge may be the same or different. Thereby, the pipe pile joint 6 of the same form can be used.

  When manually rotating the bladed small-diameter connecting pipe pile 1, a through-hole for inserting a rotating rod is provided at the upper end of the bladed small-diameter connecting pipe pile 1, What is necessary is just to attach the member for attachment for connecting with another construction machine to the upper end part of the said small diameter connection pipe pile 1 with a blade | wing when rotating, pressing or driving.

  The spiral blade 4 of one or several turns is fixed to the outer periphery near the lower end of the steel pipe pile main body 9 by welding or the like. By projecting the blade 4, as shown in FIGS. 12 and 13, the upper surface of the blade 4 is above the internal friction angle φ (the range surrounded by the dotted lines in FIGS. 12 and 13 corresponds to .) Soil weights W1, W2, and W3 serve as pressing forces, and the winged small-diameter connecting pipe pile 1 can be prevented from being pulled out by a strong crosswind.

  Moreover, although the danger that the said small diameter connecting pipe pile 1 with a blade | wing sinks by the compressive load with respect to the small diameter connecting pipe pile 1 with a blade | wing from a photovoltaic power generation panel, a structure, a building, etc. is estimated, it is made to project. Further, the bladed small-diameter connecting pipe pile 1 is less likely to sink due to the contact pressure from the soil 15 against the bottom surface of the blade 4.

  As for the blade 4 of the small-diameter single pipe pile 2 with a blade or the small-diameter single pipe pile 8 with a blade that constitutes the small-diameter connecting pipe pile 1 with a blade, as an example, the position of the blade 4 is from the lower edge of the pile body 9. The blade 4 is fixed at a position 50 to 300 mm apart, and the diameter of the blade 4 is 100 to 200 mm.

  As shown in FIGS. 6 and 7, the pipe pile joint 6 is formed of each pile main body 9 of the bladed small-diameter single-pipe pile 2, the pipe-shaped single-pipe pile 7, or the bladed small-diameter single-pipe pile 8. It has a pipe shape or a columnar shape having an outer diameter in contact with the inner peripheral wall surface, or a pipe shape having an inner diameter in contact with the outer peripheral wall surface of the pile body 9, and is drilled in the same direction. At least two through holes 12 and 13 are provided as the number of through holes.

  In the form of the pipe shape, as shown in FIG. 6A, the form having an outer diameter in contact with the inner peripheral wall surface of the pile body 9 from the upper end portion to the lower end portion, as shown in FIG. A form in which an annular protrusion 20 is provided on the outer peripheral wall surface of the central portion in the longitudinal direction and has an outer diameter in contact with the inner peripheral wall surface of the pile main body 9, as shown in FIG. A configuration in which the partition wall 22 is provided on the inner peripheral wall surface in the central portion in the longitudinal direction in the longitudinal direction, and the inner diameter from the upper end to the lower end is in contact with the outer peripheral wall of the pile body 9 as shown in FIG. There are forms to have. The annular projection 20 or the partition wall portion 22 is attached at the time of connection in a form of being interposed between the opposite edge portions of the upper pipe pile and the lower pipe pile of the bladed small-diameter connection pipe pile 1.

  In addition, the columnar form includes a form having an inner diameter in contact with the outer peripheral wall surface of the pile body 9 from the upper end to the lower end as shown in FIG.

  And it has the form which provided the through-holes 12 and 13 of the same direction at right angles with respect to a longitudinal direction at least two places. The upper through hole 12 of the pipe pile joint 6 allows the through hole 10 and the bolt 14 on the lower end side of the bladed small diameter single pipe pile 2 to be inserted, and the lower through hole 13 of the pipe pile joint 6 has a small diameter. The position and size of the through-hole diameter are set so that the through-hole 11 and the bolt 14 on the upper end side of the pipe-like single-pipe pile 7 or the bladed small-diameter single-pipe pile 8 that is the single-pipe pile 3 can be inserted. The

  A bolt 14 is inserted into the through hole 13 on the lower end side of the pipe pile joint 6 and the through hole 11 on the upper end side of the small-diameter single pipe pile 3 disposed on the lower side and fastened with a nut. The pipe pile joint 6 is screwed to the small-diameter single-pipe pile 3 and the lower-end side of the small-diameter single-pipe pile 2 with blades disposed on the upper side and the through hole 12 on the upper end side of the pipe pile joint 6. A bolt 14 is inserted into the through hole 10 and fastened with a nut, and a pipe pile joint 6 is screwed to the upper bladed small-diameter single pipe pile 2. As for the size of the bolt 14, for example, M10 to M16 are used when the bladed small diameter single pipe pile 2 and the small diameter single pipe pile 3 have a diameter of 48.6 mm.

  The use of the pipe pile joint 6 makes it easy to connect the bladed small-diameter single pipe pile 2 and the small-diameter single pipe pile 3 to make the bladed small-diameter single pipe pile 1 into sandy or clayey ground. Since the connecting portion does not loosen when it is pulled out for removal after it has penetrated, there is an effect that it can be pulled out easily.

  In addition, when connecting pipe piles with three or more stages as bladed small-diameter connection pipe piles 1, bladed small-diameter single pipe piles 2 and small-diameter single pipe piles 3 are provided via pipe pile joints 6. The bolts 14 and nuts can be screwed in and added sequentially.

  Next, the small diameter single pipe pile 3 will be described. As shown in FIG. 9, the first form of the small-diameter single pipe pile 3 connected to the lower side of the bladed small-diameter connecting pipe pile 1 has the same outer diameter and inner diameter as the winged small-diameter single pipe pile 2. And a pipe-shaped single-pipe pile 7 having a pipe-like form provided with a through-hole 11 having the same hole diameter as the through-hole 11 of the bladed small-diameter single-pipe pile 2.

  In the case of clayey ground, if the blades 4 are inserted, the cavities generated by the blades 4 around the small-diameter single-pipe pile 8 with blades are not buried because of the clayey soil 15 and the cavities remain. Become. In the case of clay soil, when the outer peripheral surface of the pipe-like single pipe pile 7 which is one form of the small diameter single pipe pile 3 and the clayey soil 15 are in contact, as shown in FIG. Since the adhesive force C from the clay soil 15 with respect to the pipe-shaped single pipe pile 7 arises, the extraction of the small diameter connecting pipe pile 1 with a blade | wing can be prevented. Therefore, in the case of clay ground, the small-diameter single-pipe pile 3 of the first form not having the blades 4 is suitable.

  Next, the second form of the small diameter single pipe pile 3 connected to the lower side of the bladed small diameter connecting pipe pile 1 has the same outer diameter and inner diameter as the bladed small diameter single pipe pile 2, It is a pipe-like form provided with a through hole 11 having the same hole diameter as the through hole 11 on the upper end side of the bladed small-diameter single-pipe pile 2, and is wound around the outer periphery near the lower end of the steel pipe pile body 9. Or it is the small diameter single pipe pile 8 with a blade | wing which has the form which protruded the spiral blade | wing 4 of several turns, and may perforate | pierce the through-hole 10 of a lower end side, and may not make it perforate | pierce.

  In the case of the form of the small-diameter single-pipe pile 3 of the second form, the blade obtained by connecting the small-diameter single-pipe pile 8 with a blade and the small-diameter single-pipe pile 2 with a blade in any of FIGS. When the small-diameter connecting pipe pile 1 is penetrated as shown in FIG. 13, the soil weights W2 and W3 in the range of the internal friction angle φ are added to the upper portions of the two blades 4, so that the sandy system Even if it is soft ground with low sand density, it is possible to prevent the winged small-diameter connection pipe pile 1 from being pulled out after penetration, while the winged small-diameter connection from photovoltaic panels, structures, buildings, etc. Although the danger that the small-diameter connecting pipe pile 1 with blades will sink due to the compressive load on the pipe pile 1 is predicted, the contact pressure against the bottom surface of the two blades 4 is increased by the two blades 4, It becomes difficult to sink with respect to the load in the vertical direction. Therefore, in the case of the form of the small-diameter single-pipe pile 3 of the second form, it is suitable for use on soft ground with a sandy system and a low sand density.

  Next, as shown in FIG. 11 or FIG. 13, the third form of the small-diameter single pipe pile 3 connected to the lower side of the bladed small-diameter connection pipe pile 1 is the winged small-diameter single pipe pile. 8 is a form in which a notch 5 for cutting an outer peripheral wall surface including a lower end peripheral part is provided on the lower end side of the first or second form.

  The form of the notch 5 includes a triangular shape as shown in FIG. 8A, a jagged shape as shown in FIG. 8B, and the like, and the lower edge of the small-diameter single-pipe pile 3 Any form may be used as long as it forms an acute angle. By forming the notch 5, the hard formation can be easily penetrated while being crushed when it contacts a hard formation having a high soil density in the ground.

  Next, the usage pattern of the small diameter connecting pipe pile 1 with a blade | wing is demonstrated. For example, confirm whether the soil is sandy or clay, and if the soil is sandy, select the first or third form small-diameter single-pipe pile 3, or if the soil is clayey, the second or second Three types of small-diameter single pipe piles 3 are selected. And the lower end part of the selected small-diameter single-pipe pile 3 set up perpendicularly from the upper direction of the mark provided in the required position of the ground surface G of a park is contact | abutted, The said small-diameter single-pipe pile selected above 3 is inserted into the ground, and the blade 4 comes into contact with the ground. For example, in the case of manual operation, a rotating rod is inserted into a through hole provided near the upper end of the pile body 9, and the ground is moved while rotating manually. I will penetrate. When the upper end of the small-diameter single-pipe pile 3 is lowered to near the ground surface, it is temporarily stopped, the pipe-pile joint 6 is inserted from above, and the pipe-pile joint 6 is attached to the small-diameter single-pipe pile 3 with bolts 14. And screwed with nuts. Then, the small diameter single pipe pile 2 with a blade | wing arrange | positioned at the upper side and the through-hole 10 of the said pipe pile joint 6 are made to correspond, and it bolts with the volt | bolt 14 and a nut. Then, when the required depth is reached, the rotation work is stopped. By the above, the small diameter single pipe pile 2 with a blade | wing is embed | buried in the ground. And it can be set as the anchor for the base part of a ground building by fixing a fixture with another building etc. to the upper end vicinity of the small diameter single pipe pile 2 with a blade | wing.

  Next, a pipe-shaped single-pipe pile 7 of the first form of the small-diameter single-pipe pile 3 (represented as the first form in Table 1), a small-diameter with blades of the second form of the small-diameter single-pipe pile 3 Table 1 shows the results of the pull-out strength of the pipe pile 8 (represented as the second form in Table 1). In Table 1, the converted N value is based on the Swedish sounding test, indicates the hardness of the soil 15, and the pulling strength indicates the difficulty of coming off.

From Table 1, in order to make the pulling strength, which indicates the difficulty of drawing, almost the same even if the soil changes, in the case of clay, use the pipe-shaped single pipe pile 7 of the first form, and use soft sandy soil. In the case of the above, it is shown that if the small-diameter single pipe pile 8 with blades of the second form is used, an optimum use form is obtained.

DESCRIPTION OF SYMBOLS 1 Small diameter connecting pipe pile with a blade 2 Small diameter single tube pile with a blade 3 Small diameter single tube pile 4 Blade 5 Notch 6 Pipe pile joint 7 Pipe-shaped single tube pile 8 Small diameter single tube pile 9 with a blade 9 Pile body 10 Through-hole 11 Through-hole 12 Through-hole 13 Through-hole 14 Bolt 15 Soil 20 Circular protrusion 21 Cone 22 Bulkhead φ Internal friction angle C Adhesive force G Ground surface W1 Soil weight W2 Soil weight W3 Soil weight

Claims (3)

On the outer periphery near the lower end of the pile body made of steel pipe, one or several spiral blades are projected,
A small-diameter single-pipe pile with blades provided with at least one through-hole in the same direction in a direction perpendicular to the longitudinal direction at positions near each of the upper and lower edges of the pile body,
Below the bladed small diameter single pipe pile,
A small-diameter single-pipe pile having the same outer diameter and inner diameter as the small-diameter single-pipe pile with blades, and at least including a through-hole having the same hole diameter as the through-hole of the small-diameter single-pipe pile with blades,
A pipe-like or columnar shape having an outer diameter in contact with an inner peripheral wall surface of the bladed small-diameter single-pipe pile on the lower end edge side of the bladed small-diameter single-pipe pile, or the bladed small-diameter A pipe pile joint having an inner diameter with which the inner peripheral wall surface is in contact with the outer peripheral wall surface of the single pipe pile, the pipe pile joint provided with at least two through holes in a direction perpendicular to the longitudinal direction and the same direction;
A bolt and a nut that are inserted and fastened through a through-hole on the upper end side of the small-diameter single-pipe pile and a through-hole on the lower end side of the pipe pile joint;
A bolt and a nut that are inserted and fastened through a through hole on the lower end side of the bladed small-diameter single pipe pile and a through hole on the upper end side of the pipe pile joint;
A small-diameter connecting pipe pile with a blade characterized by comprising.   The small-diameter connecting pipe pile with blades according to claim 1, wherein one or several spiral blades are provided on the outer periphery near the lower end of the small-diameter single pipe pile.   The bladed small-diameter connecting pipe pile according to claim 1 or 2, wherein a notch for cutting an outer peripheral wall surface including a lower peripheral edge is provided on a lower end side of the small-diameter single pipe pile.

Images