JP2008169564A - Metallic pipe pile, and method and equipment for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic pipe pile which can be prevented from draw out, because resistance to a pulling force can be increased without reference to the direction of the pulling force to be applied, by means of a small number of working man-hours. <P>SOLUTION: In the metallic pipe piles 1, 1, etc. with protrusions 1a, 1a, etc., since a plurality of protrusions 1a, 1a, etc. are formed in such a shape as to be protruded radially outward by overhang molding, a small number of working man-hours increase surface areas of the metallic pipe piles 1, 1, etc. are increased. When the pulling force acts on the metallic pipe piles 1, 1, etc., great resistance can be generated depending on the increased surface area, so as to prevent the metallic pipe piles 1, 1, etc. from draw out. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal pipe pile embedded in the ground and used for a pile foundation of a structure, a manufacturing method thereof, and a manufacturing apparatus.

  It is desirable that structures such as buildings and bridges are constructed on solid ground such as rock. However, for example, in the ground of urban areas, suburbs, and landfills, the soft ground is deposited thickly. Therefore, the structure is supported directly without satisfying the conditions such as the ground supporting force and allowable subsidence. It is not possible. For such soft ground, pile foundations that support the base portion (hereinafter referred to as footing), which has a large contact area with the ground in order to disperse the weight of the structure, are widely adopted. .

  As a pile foundation, for example, there is a method of driving a pile to a solid ground that becomes a support ground and transmitting the vertical load of the structure to the support ground by the pile to support the structure. Pile construction methods include the embedding method in which precast piles such as concrete piles and steel pipe piles (metal pipe piles) are installed after drilling the ground, and the piles are forced to penetrate into the ground by hammering and other pile driving machines. There are three methods, the cast-in-place method, in which piles are built on site by placing concrete after drilling the ground.

  As a pile used for pile foundations, when the support ground is deep and there is a resistance layer in the middle, steel pipe piles, which are steel cylinders with excellent horizontal and vertical support forces, are suitable and widely used. Yes. Such a steel pipe pile is supported by the ground indirectly through soil cement or concrete formed by stirring and mixing the soil of the ground and cement milk, or is directly supported by the ground. It is constructed by the driving method.

However, when a horizontal or vertical force acts on the structure due to an earthquake, wind, etc., and an upward pulling force acts on the steel pipe pile, the steel pipe pile has a circular cross section, so the steel pipe pile is embedded. Since there is little contact area with concrete, soil cement, soil, etc., there is a possibility that the steel pipe pile will be pulled out. Then, in order to prevent drawing of a steel pipe pile, the steel pipe pile which has a processus | protrusion so that a contact area may be increased is proposed (for example, refer patent document 1).
JP-A-8-199565

  In patent document 1, the pile integrated by arranging the steel pipe pile which has a processus | protrusion in soil cement is used for the pile foundation. In this invention, at least one of the inner surface and the outer surface of the steel pipe pile is provided with a plurality of protrusions spirally formed in the axial length direction or a plurality of protrusions arranged in a staggered manner, and the contact area with the soil cement by the protrusions By increasing the adhesion strength, the strong bond is achieved.

  However, such a steel pipe pile is generally formed into a pipe by rolling the steel sheet after forming a projection by rolling or the like on the steel sheet, and the number of processing steps increases because the number of processes to form into the pipe increases. There was a problem that the cost also increased.

  The present invention has been made in view of such circumstances, and the main object is to add protrusions at a plurality of locations in the circumferential direction so as to project radially outward by overhanging, thereby reducing the number of processing steps. An object of the present invention is to provide a metal pipe pile that can increase the resistance to the pulling force regardless of the direction of the pulling force to be applied and can prevent pulling.

  It is another object of the present invention to provide a metal pipe pile that can increase resistance to an applied pulling force by providing protrusions at a plurality of locations in the axial length direction.

  Another object of the present invention is to provide a metal that can increase the resistance to the pulling force regardless of the direction of the pulling force applied by providing the protrusions so that the circumferential position differs depending on the axial length position. To provide pipe piles.

  Another object of the present invention is to provide a metal tube pile that can increase the resistance to the pulling force regardless of the direction of the pulling force applied by providing the protrusions at equal intervals in the circumferential direction. It is in.

  Another object of the present invention is to provide a metal pipe pile capable of increasing the resistance to the pulling force regardless of the direction of the pulling force applied by providing protrusions having an arcuate longitudinal and transverse cross section. Is to provide.

  Another object is to cause a pressing body having a convex portion arranged inside the metal tube to advance in a radial direction by a driving source to be provided outside the metal tube, and to make the metal tube radially outward by the convex portion. An object of the present invention is to provide a manufacturing method of a metal pipe pile that can use an existing metal pipe by pressing to form a protrusion, and can manufacture a metal pipe pile having a protrusion with a small number of processing steps.

  Another object is to connect a hydraulic cylinder or mechanical drive source to be provided outside the metal tube and a piston of the hydraulic cylinder or the mechanical drive source, and tilt from one end to the other end. A plurality of presses having a rod that is inserted into the inside of the metal tube, an inclined surface that is in sliding contact with the inclined portion, and a convex portion that presses the metal tube radially outward. By providing a body, it is providing the manufacturing apparatus of the metal pipe pile which can generate | occur | produce a big pressing force and can form a protrusion easily.

  The metal tube pile according to the present invention is characterized in that in the metal tube pile having protrusions, the protrusions are protruded radially outward by overhanging at a plurality of locations in the circumferential direction.

  In this invention, since a plurality of protrusions are formed by projecting outward in the radial direction by overhang forming, the surface area of the metal tube pile is increased and the pulling force acts on the metal tube pile with a small number of processing steps. When this occurs, a large resistance is generated according to the increased surface area, and the metal pipe pile can be prevented from being pulled out. In addition, since protrusions are formed at a plurality of locations in the circumferential direction, a large resistance force is generated regardless of the direction of the pulling force when a pulling force consisting of axial and radial component forces is applied. Pulling out the metal pipe pile can be prevented.

  Moreover, the metal pipe pile which concerns on this invention is provided with the said protrusion in the multiple places of an axial length direction.

  In this invention, since protrusions are provided at a plurality of locations in the axial length direction, when the surface area of the metal pipe pile increases and a pulling force acts on the metal pipe pile, a large resistance is generated according to the increased surface area. A force is generated, and the metal pipe pile can be prevented from being pulled out.

  Moreover, the metal pipe pile according to the present invention is characterized in that the protrusion is provided so that a circumferential position differs depending on an axial length direction position.

  In the present invention, since the protrusions having different circumferential positions according to the axial length position are provided, when the pulling force acts on the metal pipe pile, a large resistance force is obtained regardless of the direction of the pulling force. Is generated, and the metal pipe pile can be prevented from being pulled out.

  Moreover, the metal pipe pile which concerns on this invention is characterized by the said protrusion being equally distributed in the circumferential direction.

  In this invention, since it is equally distributed in the circumferential direction, when a pulling force acts on the metal pipe pile, a large resistance force is generated regardless of the direction of the pulling force, and the metal pipe pile is pulled out. Can be prevented.

  Moreover, the metal pipe pile which concerns on this invention is characterized by the axial longitudinal cross-section and cross-sectional shape of the said protrusion being circular arc shape.

  According to the present invention, since the projections having an axial longitudinal section and a transverse section having an arc shape are provided, when a pulling force is applied to the metal pipe pile, a large resistance force is applied regardless of the direction of the pulling force. Is generated, and the metal pipe pile can be prevented from being pulled out.

  Moreover, the manufacturing method of the metal pipe pile which concerns on this invention is a press body which has the convex part distribute | arranged to the inside of this metal pipe by the drive source which should be provided in the exterior of a metal pipe in the manufacturing method of the metal pipe pile which has a processus | protrusion. And the protrusion is formed by pressing the metal tube outward in the radial direction by the convex portion.

  In the present invention, by causing the pressing body having a convex portion disposed inside the metal tube to advance in the radial direction by the driving source, the existing metal tube is pressed radially outward from the inside by the convex portion. Since the metal pipe is formed with a protrusion protruding outward in the radial direction, an existing metal pipe can be used, and a metal pipe pile having the protrusion can be manufactured with a small number of processing steps.

  Further, the metal pipe pile manufacturing apparatus according to the present invention is a metal pipe pile manufacturing apparatus having protrusions, wherein a hydraulic cylinder or a mechanical drive source to be provided outside the metal pipe, and a piston of the hydraulic cylinder or An inclined portion connected to the mechanical drive source and having an inclined portion inclined from one end to the other end, the inclined portion being in sliding contact with the inclined portion and a rod inserted into the inside of the metal tube And a plurality of pressing bodies having convex portions for pressing the surface and the metal tube outward in the radial direction.

  In the present invention, a mechanical drive source such as a hydraulic cylinder or a press, and an inclined portion that is connected to a piston or a mechanical drive source of the hydraulic cylinder and is inclined from one end to the other end. A rod into which the inclined portion is inserted into the inside of the metal tube, and a plurality of pressing bodies each having an inclined surface that is in sliding contact with the inclined portion and a convex portion that presses the metal tube radially outward. For example, when the rod connected to the piston is advanced in the axial direction of the metal tube by the operation of the hydraulic cylinder, the inclined portion formed in the rod also integrally advances in the axial length direction, The pressing body slidably contacting the inclined portion is pushed outward in the radial direction of the metal tube while sliding on the inclined surface, and the convex portion is pressed radially outward from the inside of the metal tube. As a result, the axial movement of the rod is converted into the radial movement of the pressing body, and the force generated by the hydraulic cylinder is converted into a large pressing force acting radially outward from the inside of the metal tube. Therefore, the protrusion can be easily formed on the metal tube.

  As described above in detail, according to the present invention, when the surface area of the metal pipe pile is increased and a pulling force acts on the metal pipe pile with a small number of processing steps, a large resistance force is generated according to the increased surface area. Thus, the metal pipe pile can be prevented from being pulled out.

  Further, according to the present invention, when a pulling force composed of axial and radial component forces is applied, a large resistance force is generated regardless of the direction of the pulling force, thereby preventing the metal pipe pile from being pulled out. can do.

  Further, according to the present invention, an existing metal pipe can be used, and a metal pipe pile having protrusions can be manufactured with a small number of processing steps.

  Further, according to the present invention, the force generated by the hydraulic cylinder can be converted into a large pressing force by sliding the pressing body against the inclined portion of the rod, and the protrusion can be easily formed.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1A shows a partial elevation view of a steel pipe pile 1 according to the present invention, and FIG. 1B shows a cross-sectional view of the steel pipe pile 1 taken along line II in FIG. Yes.

  The steel pipe pile 1 is formed with a plurality of protrusions 1a, 1a,... Protruding outward in the radial direction at equal intervals in the circumferential direction and at a uniform pitch in the axial direction. The protrusions 1a, 1a,... Are provided so that their circumferential positions are the same at each axial position. As shown in the partial cross section of FIG. 1 (a) and FIG. 1 (b), the protrusions 1a, 1a,.

  For the steel pipe pile 1, for example, an STK370 carbon steel pipe having a total length of 5 m, a diameter of 89 mm, and a thickness of 3.2 mm can be used, and substantially the same at an axial length pitch of 200 mm over approximately 4 m (excluding both ends 500 mm). A plurality of shaped protrusions 1a, 1a... Are formed. The protrusions 1a, 1a,... Are formed so that the protrusion length in the axial direction of the carbon steel pipe is approximately twice the protrusion height so that the protrusion height in the radial direction of the carbon steel pipe is 10 mm.

  The steel pipe pile 1 has a diameter of 114.3 mm and a thickness of 3.2 mm, a diameter of 139.8 mm and a thickness of 3.5 mm, a diameter of 165.2 mm and a thickness of 4.5 mm, etc. Can also be used. Further, it is desirable that the protrusions 1a, 1a,... Be formed so that the axial length pitch is in the range of 100 to 200 mm and the protrusion height is in the range of 5 to 10 mm. In addition, in this Embodiment, although the steel pipe pile 1 made from carbon steel was described, a pile is not limited to steel, What is necessary is just metal.

  An application example of a pile foundation using the steel pipe pile 1 according to the present embodiment is shown in FIG. As shown in FIG. 2, a soft ground 12 is deposited on a supporting ground 11, and steel pipe piles 1, 1,... Are embedded in the ground so that one end penetrates the supporting ground 11 and the other end protrudes on the ground. Has been. A footing 13 is built at the other end of the steel pipe piles 1, 1..., And a structure 14 is built on the upper part using the footing 13 as a base. With the above configuration, the load of the structure 14 is transmitted to the support ground 11 via the footing 13 and the steel pipe piles 1, 1.

  In addition, the pile foundation method using steel pipe piles 1, 1 ... Forcing the steel pipe piles 1, 1 ... to the ground by a pile driving machine such as an embedding method in which the steel pipe piles 1, 1 ... are installed after drilling the ground For example, a steel pipe pile soil cement pile method which is a kind of embedded pile method can be used. The steel pipe pile soil cement pile method cuts the ground into a cylindrical shape downward, stirs and mixes the cut soil and cement milk into slurry soil cements 15, 15. Is a method of forming a pile foundation by arranging steel pipe piles 1, 1... And soil cement 15, 15.

  As shown in FIG. 2, when a horizontal force acts on the structure 14, the steel pipe piles 1, 1... And the soil cement 15 integrated with the steel pipe piles 1, 1. , 15..., 15 is transmitted to the surrounding ground composed of the supporting ground 11 and the soft ground 12, and the structure 14 is supported.

  When a downward vertical force acts on the structure 14, the vertical force is transmitted to the soil cements 15, 15... Integrated with the steel pipe piles 1, 1. The vertical force is transmitted to the surrounding ground by the circumferential frictional force due to the frictional resistance with the surrounding ground on the outer peripheral surface of 15, 15,... And the compressive force at the tips of the soil cements 15, 15,.

  When an upward vertical force acts on the structure 14, only the circumferential frictional force due to the frictional resistance with the surrounding ground acts on the circumferential surfaces of the soil cements 15, 15,. At this time, when the connection between the steel pipe piles 1, 1... And the soil cements 15, 15... Is weak, the steel pipe piles 1, 1.

  In order to prevent the steel pipe piles 1, 1... According to the present embodiment from being pulled out of the soil cements 15, 15. It is comprised as mentioned above so that a contact area with soil cement 15,15 ... may become large.

  The steel pipe piles 1, 1... Having the projections 1a, 1a... Are disposed in slurry soil cements 15, 15. Since the soil cements 15, 15 ... are slurry-like, the steel pipe piles 1, 1 ... having the projections 1a, 1a ... can be easily inserted. When the steel pipe piles 1, 1 ... are inserted into the soil cements 15, 15 ..., the soil cements 15, 15 ... are solidified so that the inner and outer surfaces of the steel pipe piles 1, 1 ... including the projections 1a, 1a ... are soiled. It will be covered with cement 15, 15 ... As a result, the contact area between the steel pipe piles 1, 1... And the soil cement 15, 15... Increases, and the uneven portions of the steel pipe piles 1, 1. Adhesion strength is increased due to adhesion.

  In the steel pipe piles 1, 1... According to the present embodiment as described above, a plurality of projections 1a, 1a... To do. As a result, when an upward vertical force acts on the structure 14 and an upward pulling force acts on the steel pipe piles 1, 1 ..., the steel pipe piles 1, 1 ... including the protrusions 1a, 1a ... The contact area between the inner and outer surfaces and the soil cements 15, 15, etc. increases and the adhesion strength increases, so that the resistance to pulling force can be increased, and the steel pipe piles 1, 1. It can be prevented from being pulled out.

  In addition, since the steel pipe piles 1, 1... Are formed with a plurality of protrusions 1a, 1a... Protruding outward in the radial direction so as to be equally distributed in the radial direction and the axial length direction. When a pulling force composed of component forces in the axial direction and the radial direction is applied to ..., the resistance force against the pulling force can be increased regardless of the direction of the pulling force.

  Further, since the steel pipe piles 1, 1... Are provided with projections 1a, 1a... Formed in a partial spherical shape, the resistance to the pulling force regardless of the direction of the pulling force applied to the steel pipe piles 1, 1. The power can be increased.

  FIG. 3 is a front view schematically showing the arrangement of the manufacturing apparatus used for manufacturing the steel pipe pile 1 according to the present invention. 4 is a partial cross-sectional view of the manufacturing apparatus taken along line IV-IV in FIG. 3, and FIG. 5 is a partial cross-sectional view of the manufacturing apparatus taken along line V-V in FIG.

  Reference numeral 2 in FIG. 3 denotes a backward-acting hydraulic cylinder. The hydraulic cylinder 2 includes a cylinder housing 20 having a substantially cylindrical shape and a piston 21 that separates the inside of the cylinder housing 20 into two chambers. It is fixed to the base 9. The two chambers in the cylinder housing 20 are respectively connected to a hydraulic control valve (not shown), and hydraulic oil from a hydraulic source (not shown) is supplied and discharged by the hydraulic control valve. The piston 21 reciprocates in the axial length direction of the cylinder housing 20 due to the hydraulic pressure difference between the two chambers generated according to the supply and discharge of the hydraulic oil.

  The rod 3 is fixed to the end of the piston 21 protruding from the cylinder housing 20 at the base end, and the rod 3 is a round bar having a reduced diameter at the distal end side as shown in FIG. A support bracket 5 that holds a steel pipe 10 to be processed is attached to the base end side of the rod 3.

  The support bracket 5 has a reference plate 50 which is a rectangular flat plate provided with a through hole having a diameter slightly larger than the maximum outer diameter of the rod 3 at the center, and is coaxial with the through hole of the reference plate 50. The guide tube 51 is a cylinder extending in one direction in a direction perpendicular to the guide tube 51. The guide cylinder 51 has an outer diameter substantially equal to the inner diameter of the steel pipe 10. In the support bracket 5, the reference plate 50 side is set to the hydraulic cylinder 2 side, the rod 3 is inserted into the through hole of the reference plate 50, and the tip of the rod 3 protrudes from the open end of the guide cylinder 51. It is fixed to the base 9 at 50.

  A cam driver (inclined portion) 3 a is formed at the tip of the rod 3. The cam driver 3a has a truncated cone shape whose diameter continuously changes from the distal end in the axial length direction of the rod 3 toward the proximal end.

  A holding plate 6 and a sliding seat 7 are provided on the open end side of the cylinder of the support bracket 5. The presser plate 6 is a disc having an outer diameter slightly smaller than the inner diameter of the steel pipe 10, and a through-hole is provided at the center of the disc so as not to inhibit the cam driver 3a from moving in the axial direction. On one end surface of the presser plate 6, guide grooves 6a, 6a,... Having a rectangular cross section are radially formed with four equal intervals in the circumferential direction as shown in FIG. Further, the presser plate 6 is provided with cylindrical through holes 6b, 6b... Penetrating substantially the center of the guide grooves 6a, 6a. Such a presser plate 6 is attached to the support bracket 5 via the slide receiving seat 7 with the one end face side facing the support bracket 5.

  The sliding seat 7 is a disk having an outer diameter slightly smaller than the inner diameter of the steel pipe 10, and has a diameter continuously reduced from the hydraulic cylinder 2 side to the opposite side in the thickness direction at the center of the disk. A through-hole 7a is provided. As will be described later, the through-hole 7a is formed so as to function as a guide for the cam driver 3a when the cam driver 3a is advanced in the axial direction and the projections 1a, 1a,. It is. The presser plate 6 and the sliding seat 7 are fixed to the support bracket 5 coaxially with the rod 3.

  Four cam sliders (pressing bodies) 40, 40... Are held by the pressing plate 6 and the sliding seat 7. The cam sliders 40, 40 ... are elongated rectangular parallelepipeds having a rectangular cross section substantially equivalent to the guide grooves 6a, 6a ... formed in the holding plate 6, and one end face having a shape corresponding to the outer peripheral surface of the cam driver 3a. And the other end face provided with partial spherical convex portions 40a, 40a. Further, the cam sliders 40, 40 ... are formed with circular holes 40b, 40b ... having the same diameter as the through holes 6b, 6b ... formed in the presser plate 6.

  The cam sliders 40, 40... Have one end face on the cam driver 3a side and the other end face on the inner face side of the steel pipe 10, and as shown in FIG. 4, the radial and circumferential directions of the circular holes 40b, 40b. Are engaged with the guide grooves 6a, 6a, so that the positions are the same as the radial and circumferential positions of the through holes 6b, 6b,. .. Are inserted into the through holes 6b, 6b... And the circular holes 40b, 40b... When the cam sliders 40, 40. The force in the central direction is applied by the elastic bodies 60, 60. Further, the cam sliders 40, 40... Are held between the presser plate 6 and the sliding seat 7 so as not to move in the axial length direction of the rod 3.

  As shown in FIG. 4, the cam sliders 40, 40... Have a reduced diameter at the tip of the cam driver 3 a when the rod 3 is retracted to the retreat limit of the movable range by the hydraulic cylinder 2. Positioning is made so as to be in contact with the inner diameter side of 40.

  Cam holders 41, 41 are provided so as to surround the cam sliders 40, 40. Each of the cam holders 41 and 41 is a substantially rectangular parallelepiped having a bowl-shaped recess provided on one side surface, and is configured to hold the steel pipe 10 to be processed by bringing the surfaces with the recesses into contact with each other and integrating them. is there. Further, the cam holders 41, 41 have hemispherical concave portions that are substantially the same shape as the convex portions 40a, 40a,... Of the cam sliders 40, 40, so that the rods 3 of the cam sliders 40, 40,. It is provided. The manufacturing apparatus is configured such that the cam holders 41 and 41 can be brought into contact with and separated from each other by appropriate means.

  The steel pipe 10 to be processed is coaxial with the rod 3 and is attached to the manufacturing apparatus with one end supported by the support bracket 5 and the other end supported by the cam holders 41 and 41. The manufacturing apparatus is configured such that the steel pipe 10 can be moved in the axial length direction by a transmission mechanism such as a screw mechanism (not shown).

  With the above configuration, when the piston 21 of the hydraulic cylinder 2 reciprocates in the axial length direction of the piston housing 20, the rod 3 and the cam driver 3 a also advance and retreat in the axial length direction of the steel pipe 10 in accordance with this reciprocation. In response to this advance and retreat, the cam sliders 40, 40... Contacting the inclined surface of the cam driver 3a advance and retreat in the radial direction of the steel pipe 10 while sliding. That is, the generated force of the hydraulic cylinder 2 is converted into a radial pressing force acting on the steel pipe 10 by the cam mechanism 4 including the cam driver 3a and the cam sliders 40, 40.

  6 and 7 are explanatory views of the operation of the manufacturing apparatus according to the present invention. FIG. 6A shows a state before the protrusions 1a, 1a... Are formed. As shown in the drawing, the diameter-reduced tip of the cam driver 3a is in contact with the inner surface of the cam sliders 40, 40. The steel pipe 10 is supported by the support bracket 5 and cam holders 41 and 41.

  From this state, the hydraulic cylinder 2 is operated, and the rod 3 and the cam driver 3a are advanced to the position shown in FIG. The cam driver 3a moves using the sliding seat 7 as a guide, and the cam sliders 40, 40... That are in contact with the outer peripheral surface of the cam driver 3a are guided with respect to the outer peripheral surface of the cam driver 3a using the guide grooves 6a, 6a. The steel pipe 10 moves radially outward while sliding. As a result, the steel pipe 10 is pressed from the inner surface by the convex portions 40a, 40a,... Of the cam sliders 40, 40, and the projections 1a, 1a,.

  After the projections 1a, 1a,... Are formed in this way, the rod 3 and the cam driver 3a are retracted to the original position of FIG. 6A shown in FIG. Since the pressing force by the cam driver 3a does not act, the cam sliders 40, 40... Are restored to their original positions as shown in FIG.

  Next, as shown by white arrows in FIG. 7D, the cam holders 41 and 41 are moved away from each other. Further, the steel pipe 10 is moved in the axial length direction opposite to the hydraulic cylinder 2 by, for example, 200 mm, and the cam holders 41 and 41 are moved in directions approaching each other to hold the steel pipe 10. Thereafter, the procedure shown in FIGS. 6A to 7D is repeated over the processing range of the protrusions 1a, 1a.

  In the method of manufacturing the steel pipe pile 1 according to the present embodiment as described above, the rod 3 fixed to the piston 21 of the hydraulic cylinder 2 is advanced and retracted in the axial direction in the steel pipe 10 and formed on the rod 3. The cam slider 40, 40... Is slid on the inclined surface of the cam slider 40, 40. .., So that the force generated by the hydraulic cylinder 2 can be converted into a large pressing force by the cam mechanism 4 comprising the cam driver 3a of the rod 3 and the cam sliders 40, 40, The protrusions 1a, 1a... Can be easily formed.

  In addition, in this Embodiment, although the shape of the cam driver 3a used for the manufacturing method of the steel pipe pile 1 is a truncated cone shape, it is not limited to this, A polygon frustum shape may be sufficient. In this case, the sliding portion of the cam slider has an appropriate shape so as to be slidable with the cam driver.

  Moreover, the angle which the slope of the cam driver 3a used for the manufacturing method of the steel pipe pile 1 and the cam sliders 40, 40 ... and an axial length direction is not limited to illustration, The steel pipe 10 required for the process of the steel pipe pile 1 is shown. The design can be appropriately changed according to conditions such as radial pressing force and extrusion amount.

  In the present embodiment, the force generated by the hydraulic cylinder 2 is converted into a pressing force by a cam mechanism including a cam driver 3a and cam sliders 40, 40, etc. to form the protrusions 1a, 1a, etc. The projections 1a, 1a,... May be formed by converting the force generated by the hydraulic cylinder 2 into a pressing force by a link mechanism, or the projections 1a, 1a,. You may comprise so that it may form.

  In the present embodiment, the hydraulic cylinder 2 is used as a drive source. However, the present invention is not limited to this. For example, an air cylinder using air pressure or a press machine may be used.

  FIG. 8 shows another embodiment of the steel pipe pile 1 according to the present invention. FIG. 8 (a) shows a partial elevation view of the steel pipe pile 1 and FIG. 8 (b) shows the structure shown in FIG. 8 (a). The cross-sectional view of the steel pipe pile 1 by the VIII-VIII line is shown, respectively. As shown in FIGS. 8A and 8B, the protrusions 1a, 1a,... Are formed in a staggered arrangement with different circumferential positions according to the axial length position. Since the other configuration is the same as that of the embodiment shown in FIG. 1, the same reference numerals as those in FIG.

  In the steel pipe piles 1, 1... According to the present embodiment as described above, the projections 1a, 1a,... Are formed so as to be arranged in a staggered manner with different circumferential positions according to the axial length position. The resistance force against the pulling force can be increased regardless of the direction of the pulling force applied to the steel pipe piles 1, 1.

  In the manufacturing apparatus for manufacturing the steel pipe piles 1, 1... According to the present embodiment, the steel pipe 10 is moved in the axial direction opposite to the hydraulic cylinder 2 after the protrusions 1a, 1a. For example, the steel pipe 10 is configured to rotate 90 °. Other configurations are the same as those of the embodiment shown in FIGS.

  In the present embodiment, the protrusions 1a, 1a,... Are formed in a staggered arrangement with different circumferential positions according to the axial length position, but the present invention is not limited to this, and the protrusions 1a, 1a,. 1a... May be formed by changing the circumferential position in a stepwise manner in accordance with the axial length direction position.

  In addition, in the above embodiment, although the example which applied the steel pipe pile 1 which concerns on this invention to the pile foundation of the steel pipe pile soil-cement pile construction method was given and demonstrated, it is not limited to this and uses the steel pipe pile 1 Needless to say, it is applicable to all pile foundations that can be used.

  Moreover, in the above embodiment, although the steel pipe pile 1 which has protrusion 1a, 1a ... is used for a pile foundation, it is not limited to this, As a support | pillar embedded and fixed to soil or concrete etc. Can be used. Furthermore, it goes without saying that the present invention can be implemented in variously modified forms within the scope of the matters described in the claims.

It is a figure which shows embodiment of the steel pipe pile which concerns on this invention. It is a figure which shows the example of application of the pile foundation using the steel pipe pile which concerns on this Embodiment. It is a front view which shows schematically arrangement of a manufacturing device used for manufacture of a steel pipe pile concerning the present invention. It is a fragmentary sectional view of the manufacturing apparatus by the IV-IV line of FIG. It is a fragmentary sectional view of the manufacturing apparatus by the VV line of FIG. It is operation | movement explanatory drawing of the manufacturing apparatus which concerns on this invention. It is operation | movement explanatory drawing of the manufacturing apparatus which concerns on this invention. It is a figure which shows other embodiment of the steel pipe pile which concerns on this invention.

Explanation of symbols

1 Steel pipe pile (metal pipe pile)
1a Protrusion 10 Steel pipe (metal pipe)
2 Hydraulic cylinder (drive source, hydraulic cylinder)
21 Piston 3 Rod 3a Cam driver (inclined part)
4 Cam mechanism 40 Cam slider (pressing body)
40a Convex part 41 Cam holder

Claims (7)

  The metal pipe pile which has a processus | protrusion, The said processus | protrusion is made to project in the radial direction outward by overhang | projection shaping | molding in the several places of the circumferential direction, The metal pipe pile characterized by the above-mentioned.   The metal pipe pile according to claim 1, wherein the protrusion is provided at a plurality of locations in the axial direction.   The metal pipe pile according to claim 2, wherein the protrusion is provided so that a circumferential position differs according to an axial length direction position.   The metal pipe pile according to any one of claims 1 to 3, wherein the protrusions are equally arranged in a circumferential direction.   The metal pipe pile according to any one of claims 1 to 4, wherein an axial longitudinal section and a transverse section shape of the protrusion are arcuate.   In the method of manufacturing a metal pipe pile having a protrusion, a pressing body having a convex portion arranged inside the metal pipe is caused to advance in a radial direction by a driving source to be provided outside the metal pipe, and the metal pipe is formed by the convex portion. A method of manufacturing a metal pipe pile, wherein the projections are formed by pressing outwardly in the radial direction.   In a manufacturing apparatus for a metal pipe pile having a protrusion, a hydraulic cylinder or a mechanical drive source to be provided outside the metal pipe, and a piston of the hydraulic cylinder or the mechanical drive source, and one end to the other end An inclined portion inclined toward the rod, the inclined portion being inserted into the inside of the metal tube, an inclined surface that is in sliding contact with the inclined portion, and a convex that presses the metal tube radially outward. An apparatus for manufacturing a metal pipe pile, comprising: a plurality of pressing bodies each having a portion.

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