JP6442121B2 - Manufacturing method of pile - Google Patents

Description

The present invention relates to a method for manufacturing a pile for use in such order to support the building element is embedded in the ground (pile).

In construction work sites, piles used to embed in the ground and support building members are indispensable building materials. Since many piles are used at one construction work site, they are required to be inexpensive. In addition, considering workability and reuse, it is also required to be strong.
Usually, the pile is formed with a tip for easy driving into the ground. As a pile having such a tip portion, for example, Patent Literature 1 discloses a technique of forming the tip portion by press molding. In addition, as in the technique described in Patent Document 2, there are also manufacturing methods such as reducing the diameter of the single tube by hot drawing or reducing the diameter of the single tube by swaging and providing a solid tip.

JP 2003-113610 A JP 2004-218235 A

  However, the pile as described in Patent Document 1 and a pile manufactured by caulking and fixing a hollow cone-shaped driving member to the tip of a single pipe have low strength at the tip of the pile. There was a problem that it was not able to be accurately input or reused. Moreover, when a pile is manufactured by a manufacturing method described in Patent Document 2 or a method such as swaging, there is a problem that a manufacturing process is complicated and an expensive manufacturing apparatus is required. Moreover, since the front-end | tip part of the pile manufactured by such a method becomes thin, there existed a possibility that deformation | transformation, such as buckling, might not be able to show | play a function sufficient as a pile because strength was insufficient.

Therefore, an object of the present invention is to provide a strong and inexpensive pile (pile) and a manufacturing method thereof.

A stake is formed on one end of a single pipe, and a constricted part whose outer shape becomes smaller toward the tip is formed by forming a plurality of indented parts where one end is pushed inward. A technical means is used in which a driving member for driving into the ground is coupled to the tip of the throttle portion.

Since the diaphragm Ri portion is formed by a plurality of locations forming a pushing portion, it is possible to increase the structural strength, can be a strong pile. Moreover, since the pushing part can be formed by a simple process, an inexpensive pile can be obtained.

In the first aspect of the present invention, by forming a plurality of pushing portions where one end portion is pushed inward at one end portion of the single tube, the throttle portion whose outer shape becomes smaller toward the tip end is formed. A method for manufacturing a pile comprising: a throttle portion forming step to be formed; and a tip portion forming step for coupling a driving member for driving into the ground to the tip of the throttle portion, the throttle portion forming step In the single tube, and a pushing portion forming jig for forming a plurality of pushing portions at one end of the single tube, and a single tube can be inserted, and the diameter decreases in the insertion direction. And a guide jig having a conical guide part for guiding the outer peripheral surface of the pipe, and the pressing part forming jig has a single outer tube whose outer dimension decreases toward one end. A deformation control unit for controlling the deformation of the A groove portion formed at a plurality of locations along the insertion direction, and inserting the pushing portion forming jig into one end portion of the single tube, and a portion corresponding to the groove portion of the single tube in the groove portion It is said that a deformation introducing portion serving as a starting point of formation of the pushing portion is formed by pushing in, and one end portion of a single pipe is press-fitted into the guide jig in a state of being attached to the pushing portion forming jig Use technical means.

According to the first aspect of the present invention, the outer shape of the single tube is formed by forming a plurality of indented portions in which one end portion is pushed inward at one end portion of the single pipe by the narrowed portion forming step. A pile can be manufactured by a simple process of forming a narrowed portion that becomes smaller toward the tip and connecting a driving member for driving into the ground to the tip of the throttled portion in the tip portion forming step. The throttle part forming step is a simple process in which a single pipe is press-fitted into a throttle part forming jig, and an expensive manufacturing apparatus is not required, so that a pile can be manufactured at low cost. In addition, since the pile manufactured by such a manufacturing method is formed by forming a plurality of indented portions by the narrowed portion, the structural strength can be increased and the pile can be made strong.

In the invention described in claim 2, in the manufacturing method of pile according to claim 1 (pile), the pushing portion forming jig, from the connected to the groove portion inclined surface inclined toward a bottom direction of the groove Thus, a technical means is used in which a chamfered portion that guides deformation of one end of the single tube in the direction of the groove is formed.

According to the second aspect of the present invention, since the end portion of the single pipe is smoothly guided toward the groove portion by the chamfered portion, plastic flow easily occurs. Thereby, the force which press-fits a single pipe can be made small, and it does not cause distorted deformation.

It is explanatory drawing which shows the structure of the pile of this invention. 1A is a side view, FIG. 1B is a plan view seen from the driving member side, and FIG. 1C is an explanatory view showing the structure of the portion excluding the driving member in FIG. 1B. . It is explanatory drawing which shows the structure of the pushing-in part formation jig | tool which comprises an aperture | diaphragm | squeeze part formation jig | tool. 2A is a top view seen from the tip, FIG. 2B is a side view, and FIG. 2C is a cross-sectional view taken along line AA in FIG. 2A. It is explanatory drawing which shows the structure of the guide jig which comprises an aperture | diaphragm | squeeze part formation jig | tool. 3A is a top view, FIG. 3B is a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 3C is a bottom view seen from the direction in which the single tube is inserted. It is explanatory drawing which shows the manufacturing method of a pile. It is explanatory drawing which shows the shape of the single pipe after a pushing part formation process. FIG. 5A is a view seen from the front end direction, and FIG. 5B is a side view.

As shown in FIG. 1, the pile 1 is formed by connecting a driving member 20 for driving into the soil to one end of a single pipe 10.

  The single pipe 10 is a tubular member that can be plastically processed, such as a steel pipe, which is generally used as a building material.

  In one end portion of the single tube 10, a plurality of pushing portions 11 in which one end portion is pushed inward toward the axial center of the single tube 10 are formed. By forming the pushing portions 11 at a plurality of locations in this way, a narrowed portion 12 whose outer shape becomes smaller toward the tip is formed at one end of the single tube 10. In the present embodiment, the second throttle part 13 is formed by slightly reducing the outer diameter of the single pipe in order to reduce the resistance of the throttle part 12 and the pile 1 to be driven into the ground. Absent.

  As shown in FIG. 1C, the diaphragm 12 has a petal-like cross section. In this embodiment, the pushing part 11 is formed in six places at substantially equal angles. Considering the structural strength, workability, and the like, it is preferable to form the pushing portions 11 at six places, but the present invention is not limited to this.

The driving member 20 is made of a high-strength material that can be driven into the ground, such as an iron-based material, and has an outer shape that is substantially conical. ing. Here, since the driving member 20 is a member to which a large force is applied when the pile 1 is embedded in the soil, it is preferable to use a solid member. The driving member 20 is not limited to a conical shape as long as the outer dimension is reduced toward the tip and the pile 1 is easily embedded.

For example, in a conventional pile, there is one in which the tip portion that is driven into the soil is formed by a hollow member formed by drawing or the like, but for example, when formed by swaging, the drawn portion is thin. Therefore, the strength is insufficient and deformation such as buckling occurs, and there is a possibility that a sufficient function as a pile cannot be achieved. On the other hand, the pile 1 is provided with the pushing portions 11 formed at a plurality of locations in the squeezed portion 12 and thus has a high structural strength. Sufficient functions can be achieved. Further, since the structural strength is high, it can be used repeatedly, and the cost can be reduced.

  Next, the manufacturing method of the pile 1 is demonstrated.

For the manufacture of the pile 1, as shown in FIG. 2, a drawn portion forming jig 2 for forming a drawn portion 12 by forming a pushing portion 11 at one end of the single pipe 10 is used.

As shown in FIGS. 2 and 3, the throttle portion forming jig 2 is formed so as to be insertable into the single tube 10, and a pushing portion forming jig for forming a plurality of pushing portions 11 at one end of the single tube 10. 30 and a guide jig 40 that can be inserted into the single tube 10 and guides the outer peripheral surface of the single tube 10.

The pushing portion forming jig 30 has a deformation control unit 31 for controlling the deformation of the single tube 10 as the outer dimension decreases toward one end, and a plurality of locations along the insertion direction of the single tube 10 in the deformation control unit 31. The formed groove part 32 and the cylindrical main body part 33 formed to have a diameter that can be inserted into the single tube 10 are provided. Further, a chamfered portion 34 is connected to the end portion of the groove portion 32, which is an inclined surface that is inclined toward the bottom portion 32 a of the groove portion 32 and guides deformation of one end portion of the single tube 10 in the direction of the groove portion 32. ing. A screw hole 35 for screwing the fixing screw 44 (FIG. 3) is formed at the tip.

In this embodiment, the groove part 32 is arrange | positioned at six places every 60 degrees. The deformation control unit 31 is formed as a conical surface having a tip angle of about 60 °. Here, the angle of the tip is arbitrary as long as the pile 1 can be easily driven into the soil and can have high structural strength. Further, the chamfered portion 34 is formed to be inclined by about 45 ° toward the bottom portion 32a. The chamfered portion 34 may be either a flat surface or a curved surface.

The guide jig 40 is formed in the main body portion 41 so that the single tube 10 can be inserted, and has a conical surface-shaped guide portion 42 that is reduced in diameter in the insertion direction and guides the outer peripheral surface of the single tube 10. Positioning and fixing of the pushing portion forming jig 30 and a plate-like positioning member 43 for restricting the insertion amount of the single tube 10, and a fixing screw 44 for positioning and fixing the pushing portion forming jig 30 via the positioning member 43. It is equipped with.

The guide part 42 is formed to have substantially the same angle as the chamfered part 34 in the insertion direction.

The pile 1 has a throttle portion forming step for forming a throttle portion 12 whose outer shape decreases toward the tip by forming a plurality of pushing portions 11 at one end of the single tube 10, and the tip of the throttle portion 12. And a tip portion forming step for joining the driving member 20 to the head.

In the narrowed portion forming step, first, as shown in FIG. 4A, the pushing portion forming jig 30 is inserted into one end portion of the single tube 10. Here, the pushing portion forming jig 30 is inserted so that the tip of the single tube 10 covers a part of the groove portion 32, for example, about 10 mm.

Next, as shown in FIG. 4B, the deformation introducing portions 14 are formed by plastically deforming the portions corresponding to the respective groove portions 32 of the single tube 10 and pushing the portions toward the groove portions. The deformation introducing portion 14 is a region obtained by slightly deforming the end portion of the single tube 10, for example, a region from the tip to about 6 mm toward the inside so as to be a starting point of the formation of the pushing portion 11. It can be formed by a method of driving a corresponding portion of the single tube 10 with a chisel.

Subsequently, as illustrated in FIG. 4C, one end of the single tube 10 is inserted into the guide jig 40 in a state where the single tube 10 is mounted on the pushing portion forming jig 30. Then, the fixing screw 44 is screwed into the screw hole 35 at the tip of the pressing portion forming jig 30 via the positioning member 43, and the pressing portion forming jig 30 is positioned and fixed with respect to the guide jig 40, and then the press The single tube 10 is press-fitted toward the guide jig 40 using a machine capable of pressurization such as a machine. Since the pushing portion forming jig 30 is fixed to the pushing portion forming jig 30 by the fixing screw 44, the pushing portion forming jig 30 does not come out of the guide jig 40 by a reaction force when the single tube 10 is press-fitted.

When the single tube 10 is press-fitted, the outer peripheral surface is guided by the guide portion 42 of the guide jig 40 so that the diameter is reduced, as shown in FIG. Here, unlike the swaging, the region guided by the guide portion 42 cannot be escaped by being plastically deformed in the distal direction, but the deformation introducing portion 14 is formed in the single tube 10 at a position corresponding to the groove portion 32. Therefore, the end of the single tube 10 is plastically deformed inward from the vicinity of the deformation introducing portion 14. At this time, the end portion of the single tube 10 is smoothly guided and pushed by the chamfered portion 34 toward the groove portion 32 to form the pushing portion 11 as shown in FIG. The appearance is shown in FIG. Since the end portion of the single tube 10 is smoothly guided toward the groove portion 32 by the chamfered portion 34, plastic flow is likely to occur. Thereby, the force which press-fits the single pipe | tube 10 can be made small, and an irregular deformation | transformation does not raise | generate.

  When the pressing portion forming jig 30 and the guide jig 40 are removed from the single tube 10 after the predetermined amount of press-fitting is completed, the single tube 10 having the throttle portion 12 formed at one end can be obtained. In addition, when forming the 2nd aperture | diaphragm | squeeze part 13, it can form by well-known methods, such as press injection to a type | mold, and a drawing process.

  In the subsequent tip portion forming step, the driving member 20 is coupled to the tip of the narrowed portion 12 by a known method such as spot welding.

  The pile 1 can be manufactured by the above process. According to this manufacturing method, the single tube 10 and the driving member 20 may be prepared, and the drawing portion forming process is a simple process of press-fitting the single tube 10 into the drawing portion forming jig 2, and is expensive. Since an apparatus is also unnecessary, the strong pile 1 can be manufactured by a simple process.

  In order to embed the pile 1 in the ground, a striking jig for applying a striking to the other end of the pile 1 when piling can be used. For example, a solid member that can be locked to the other end of the pile 1 can be used as the striking jig.

(Effect of embodiment)
According to the pile of this invention and its manufacturing method, a firm pile can be manufactured cheaply.

(Other embodiments)
It is possible to employ a method in which a caulking portion that can be caulked by the pushing portion 11 formed in the narrowed portion forming step is provided on the driving member. According to this, since the narrowed portion forming step and the tip portion forming step can be performed as one step, the pile can be manufactured by a simpler step.

DESCRIPTION OF SYMBOLS 1 ... Pile 2 ... Restriction part formation jig 10 ... Single pipe 11 ... Pushing part 12 ... Restriction part 12a ... Tip 14 ... Deformation introduction part 20 ... Driving member 30 ... Pushing part formation jig 31 ... Deformation control part 32 ... Groove part 32a ... Bottom 33 ... Body 34 ... Chamfer 40 ... Guide jig 41 ... Body 42 ... Guide 43 ... Positioning member 44 ... Fixing screw

Claims (2)

A throttle part forming step for forming a throttle part whose outer shape becomes smaller toward the tip by forming a plurality of indented parts in which the one end part is pushed inward at one end part of the single tube;
A tip portion forming step for connecting a driving member for driving into the ground to the tip of the throttle portion, and a manufacturing method of a pile comprising
In the throttle part forming step,
A pushing portion forming jig that is formed so as to be insertable into a single tube, and for forming a plurality of pushing portions at one end of the single tube;
A drawing part forming jig provided with a guide jig having a conical guide part formed so that a single pipe can be inserted and whose diameter decreases in the insertion direction and guides the outer peripheral surface of the single pipe,
The pushing portion forming jig is formed at a plurality of locations along the insertion direction of the single tube in the deformation control portion for controlling the deformation of the single tube as the outer dimension decreases toward one end. A groove,
Insert the pushing portion forming jig into one end of the single tube,
A portion of the single tube corresponding to the groove portion is pushed toward the groove portion to form a deformation introducing portion serving as a starting point for the formation of the pushing portion,
A pile manufacturing method, wherein one end of a single pipe is press-fitted into the guide jig in a state of being mounted on the pushing-in part forming jig. A chamfered portion that is connected to the groove portion and is inclined toward the bottom portion direction of the groove portion and guides deformation of one end portion of the single pipe in the direction of the groove portion is formed on the pushing portion forming jig. The method for manufacturing a pile according to claim 1 .