Joint structure of steel pipe pile

Abstract

To provide a joint structure of a steel pipe pile which has high rigidity to a rotational torque in a joint torsion direction, has a simple structure and has high strength.SOLUTION: A joint structure 100 of a steel pipe pile fits a projecting joint part 13 and a projecting fit part 12 of a male type joint member 10 fixed to a steel pipe pile P1 to a recessed joint part 33 and a recessed fit part 32 of a female type joint member 30 fixed to a steel pipe pile P2, and screws bolts 20 to each female screw hole 14 of the male type joint member 10 through a plurality of bolt insertion holes 34 from an outer peripheral side of the female type joint member 30.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a joint structure for a steel pipe pile. [Background technology]

[0002] Various types of joint structures for steel pipe piles have been developed in the past, and one related to the present invention is the pile joint structure described in Patent Document 1, for example.

[0003] The pile joint structure described in Patent Document 1 forms a receiving part having a circular axial cross section on the inner diameter surface at the tip side of the receiving hole of one pile made of a tubular body, and forms a female transmission part having a non-circular axial cross section continuous with the receiving part in the axial direction on the inner diameter surface at the back side of the receiving hole, A male transmission part that engages with the female transmission part is formed on the outer diameter surface of the tip side of the insertion port of the other pile consisting of a tubular body, and an insertion part that engages with the receiving part is formed on the outer diameter surface of the base side of the insertion port, continuous with the male transmission part in the axial direction; When one pile is inserted into the other pile to bury the piles, the rotational torque is transmitted by the engagement between the female transmission part and the male transmission part, while the engagement between the receiving part and the insertion part prevents the two piles from bending relative to each other at that part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-32783 A Summary of the Invention [Problem to be solved by the invention]

[0005] The pile joint structure described in Patent Document 1 has the advantages of easily and reliably transmitting the rotational torque during pile driving work and ensuring the rigidity of the connecting parts between the piles. However, further improvement of the rigidity and strength against rotational torque will continue to be an important issue in the future.

[0006] Therefore, the problem that the present invention aims to solve is to provide a joint structure for a steel pipe pile that has high rigidity against rotational torque in the torsional direction of the joint, and has a simple structure and high strength. [Means for solving the problem]

[0007] The joint structure of the steel pipe pile according to the present invention is as follows: A male joint member having a flange-shaped pile fixing portion, a polygonal tubular convex joint portion protruding in the axial direction from one surface of the pile fixing portion, a cylindrical convex joint portion protruding in the axial direction from the tip of the convex joint portion, and a plurality of female screw holes opened toward the axial center of the joint portion on the peripheral wall of the joint portion; a female coupling member having a concave joint portion and a concave mating portion formed along the axial direction inside a cylindrical body so that the convex joint portion and the convex mating portion of the male coupling member are fitted in an internally contacting state, and bolt insertion holes are opened in the peripheral wall of the concave joint portion of the cylindrical body in the same number as the female screw holes, The convex joint portion and the convex engagement portion of the male joint member are fitted into the concave joint portion and the concave engagement portion of the female joint member, and a bolt is screwed into the female threaded hole of the male joint member from the outer periphery side of the female joint member through the bolt insertion hole.

[0008] In addition, the joint structure of the steel pipe pile according to the present invention is A male joint member having a flange-shaped pile fixing portion, a polygonal cylindrical convex joint portion protruding in the axial direction from one surface of the pile fixing portion, a cylindrical convex joint portion protruding in the axial direction from the tip of the convex joint portion, and a plurality of pin holes opened in the peripheral wall of the convex joint portion toward the axial center of the joint portion; a female coupling member having a concave joint portion and a concave mating portion formed along the axial direction inside a cylindrical body for fitting the convex joint portion and the convex mating portion of the male coupling member in an inscribed state, and female screw holes opened in the peripheral wall of the concave joint portion of the cylindrical body in the same number as the pin holes; a fixing pin having a pin portion that can be inserted into a pin hole of the male coupling member through the female screw hole from an outer circumferential side of the female coupling member, and a male screw portion that can be screwed into the female screw hole, The convex joint portion and the convex engagement portion of the male coupling member are fitted into the concave joint portion and the concave engagement portion of the female coupling member, and the pin portion of the fixing pin is inserted into the pin hole of the male coupling member through the female threaded hole from the outer periphery of the female coupling member while the male threaded portion of the fixing pin is screwed into the female threaded hole of the female coupling member.

[0009] In the joint structure of the steel pipe pile, the maximum outer diameter of the convex joint portion is smaller than the outer diameter of the pile fixing portion of the male joint member, and the outer diameter of the convex joint portion is smaller than the minimum outer diameter of the convex joint portion, It is desirable that the outer diameter of the fastening portion of the male coupling member and the outer diameter of the cylindrical body of the female coupling member are equal to each other.

[0010] In the joint structure of the steel pipe pile, it is desirable to provide a countersink in the bolt insertion hole for embedding the head of the bolt. Effect of the Invention

[0011] The present invention makes it possible to provide a joint structure for a steel pipe pile that has high rigidity against rotational torque in the torsional direction of the joint, and has a simple structure and high strength. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a partially omitted front view showing a male joint member constituting a joint structure for a steel pipe pile according to an embodiment of the present invention. [Diagram 2] 2 is a partially omitted plan view of a male coupling member as viewed from the direction of the arrow A in FIG. 1. [Diagram 3] 3 is a vertical cross-sectional view taken along line BB in FIG. 2, with some parts omitted. [Figure 4] FIG. 2 is a partially omitted front view showing a female joint member constituting a joint structure of a steel pipe pile according to an embodiment of the present invention. [Diagram 5]5 is a bottom view of the female joint member as viewed from the direction of the arrow C in FIG. 4, with a portion thereof omitted. [Figure 6] FIG. 6 is a vertical cross-sectional view taken along line DD in FIG. 5, with some parts omitted. [Figure 7] FIG. 2 is a partially omitted front view showing a construction process of a joint structure for a steel pipe pile according to an embodiment of the present invention. [Figure 8] FIG. 8 is a vertical sectional view, with some parts omitted, showing a joint structure of a steel pipe pile formed through the construction process shown in FIG. [Figure 9] 1A is a left side view, FIG. 1B is a front view, and FIG. 1C is a right side view showing a fixing pin. [Figure 10] FIG. 10 is a vertical sectional view, with some parts omitted, showing a joint structure of a steel pipe pile using the fixing pin shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a joint structure 100 for a steel pipe pile according to an embodiment of the present invention will be described with reference to Figures 1 to 8. The joint structure 100 for a steel pipe pile shown in Figure 8 includes a male joint member 10 shown in Figures 1 to 3 and a female joint member 30 shown in Figures 4 to 6.

[0014] First, a male joint member 10 constituting a joint structure 100 for a steel pipe pile will be described with reference to Figs. 1 to 3 and 8. As shown in Figs. 1 to 3, the male joint member 10 is a member having a shape that is rotationally symmetric (six-fold symmetric) about the axis 10c. The male joint member 10 has a flange-shaped pile fixing portion 11, a hexagonal cylindrical convex joint portion 12 that protrudes from an upper surface 11a of the pile fixing portion 11 in the direction of the axis 10c, a cylindrical convex joint portion 13 that protrudes from the tip of the convex joint portion 12 in the direction of the axis 10c, and six female screw holes 14 that are opened in a peripheral wall 13w of the convex joint portion 13 so as to radiate toward the axis 10c.

[0015] As shown in Fig. 2, the pile fixing portion 11 of the male joint member 10 has a circular shape in plan view, the convex joint portion 12 has a rounded hexagonal shape in plan view, and the convex joint portion 13 has a circular shape in plan view. In the male joint member 10, the maximum outer diameter 12D of the convex joint portion 12 is smaller than the outer diameter 11d of the pile fixing portion 11, and the outer diameter 13d of the convex joint portion 13 is smaller than the minimum outer diameter 12d of the convex joint portion 12. As shown in Figs. 2 and 3, a hollow portion 10a is formed inside the male joint member 10, penetrating in the direction of the axis 10c.

[0016] Next, the female joint member 30 constituting the joint structure 100 of the steel pipe pile will be described with reference to Figs. 4 to 6 and 8. As shown in Figs. 4 to 6, the female joint member 30 has a concave joint portion 33 and a concave mating portion 32 formed inside the cylindrical body 31 along the axis 31c direction so that the convex joint portion 13 and the convex mating portion 12 of the male joint member 10 shown in Fig. 1 are fitted in an inscribed state, respectively, and bolt insertion holes 34 opened in the peripheral wall 33w of the concave joint portion 33 of the cylindrical body 31 in the same number as the female screw holes 14 (see Figs. 1 and 2) of the male joint member 10. The six bolt insertion holes 34 are opened radially toward the axis 31c and are in phase with the six female screw holes 14 (see Fig. 2) of the male joint member 10.

[0017] As shown in Fig. 5, the cylindrical body 31 constituting the female joint member 30 has a circular shape in plan view, the inner peripheral surface of the concave mating portion 32 has a rounded hexagonal shape in plan view, and the inner peripheral surface of the concave joint portion 33 has a circular shape in plan view. In the female joint member 30, the maximum inner diameter 32D of the concave mating portion 32 is smaller than the outer diameter 31d of the cylindrical body 31, and the inner diameter 33d of the concave joint portion 33 is smaller than the minimum inner diameter 32d of the concave mating portion 32. As shown in Figs. 5 and 6, the bolt insertion hole 34 of the female joint member 30 is provided with a counterbore 35 for embedding the head 21 of the bolt 20 (see Fig. 8).

[0018] Next, the construction process of the joint structure 100 for a steel pipe pile will be described with reference to Figures 3, 6, 7, and 8. As shown in Figure 3, the male joint member 10 is brought into close contact with the end face of the steel pipe pile P1 with the pile fixing portion 11 facing the end of the steel pipe pile P1, and then, as shown in Figure 7, the male joint member 10 is fixed to the steel pipe pile P1 by a welded portion W1. Since the outer diameter 11d (see Figure 2) of the pile fixing portion 11 of the male joint member 10 is equal to the outer diameter of the steel pipe pile P1, after fixing, the outer peripheral surface of the pile fixing portion 11 of the male joint member 10 and the outer peripheral surface of the steel pipe pile P1 are even except for the welded portion W1. The welding work for the welded portion W1 is performed in a factory.

[0019] As shown in Fig. 6, the female joint member 30 is brought into close contact with the end of the pile steel pipe P2 with the end surface 31a of the concave joint portion 33 of the cylinder 31 of the female joint member 30 facing the end of the pile steel pipe P2, and then the female joint member 30 is fixed to the steel pipe pile P2 by the welded portion W2 as shown in Fig. 7. Since the outer diameter 31d (see Fig. 5) of the cylinder 31 of the female joint member 30 is equal to the outer diameter of the pile steel pipe P2, after fixing, the outer circumferential surface of the cylinder 31 of the female joint member 30 and the outer circumferential surface of the steel pipe pile P2 are even except for the welded portion W2. As with the welded portion W1 described above, the welding work of the welded portion W2 is performed in a factory.

[0020] Next, as shown in FIG. 7, a steel pipe pile P1 to which a male joint member 10 is fixed and a steel pipe pile P2 to which a female joint member 30 is fixed are arranged in series on the same straight line, and the convex joint portion 13 of the male joint member 10 is inserted into the female joint member 30. The hexagonal shape of the outer periphery of the convex joint portion 12 of the male joint member 10 is matched with the hexagonal shape of the inner periphery of the concave joint portion 32 of the female joint member 30. Then, as shown in FIG. 8, the convex joint portion 13 and the convex joint portion 12 of the male joint member 10 are fitted into the concave joint portion 33 and the concave joint portion 32 of the female joint member 30 in an inscribed state.

[0021] When the state shown in Figure 8 is reached, the bolt insertion hole 34 of the female joint member 30 and the female threaded hole 14 of the male joint member 10 are connected to each other in the same straight line, so that when the bolt 20 is screwed into the female threaded hole 14 of the male joint member 10 through the bolt insertion hole 34 from the outer periphery of the female joint member 30, the male joint member 10 and the female joint member 30 are fixed in close contact with each other, and the joint structure 100 for the steel pipe pile is completed.

[0022] The outer diameter 11d of the pile fixing portion 11 of the male joint member 10 is equal to the outer diameter 31 of the cylindrical body 31 of the female joint member 30, and after being screwed, the head 21 of the bolt 20 is embedded in the countersink 35 of the bolt insertion hole 34, so that the outer peripheral surface of the steel pipe pile joint structure 100 has no protruding portions.

[0023] The joint structure 100 for steel pipe piles can be constructed without using large machinery, so it can be constructed even in narrow work sites. In addition, since the work shown in Fig. 8 does not require welding, it can be constructed even in work sites where thermal power cannot be used, and no welding machine or welders are required. In addition, the joint structure 100 for steel pipe piles shown in Fig. 8 has a simple structure and high strength, and also has high rigidity against forces in the torsional direction of the joint (rotational torque).

[0024] Here, an example will be described in which a fixing pin shown in Fig. 9 is used instead of the bolt 20. Fig. 9 shows the fixing pin, with (A) being a left side view, (B) being a front view, and (C) being a right side view. Fig. 10 is a partially omitted vertical sectional view showing a joint structure of a steel pipe pile using the fixing pin shown in Fig. 9. In Fig. 10, parts common to the joint structure 100 of a steel pipe pile described above are given the same reference numerals, and detailed explanations thereof will be omitted.

[0025] As shown in Fig. 10, in a joint structure 101 for a steel pipe pile using a fixing pin 40, a pin hole 15 is formed in the male joint member 10 instead of the above-mentioned female threaded hole 14. Meanwhile, a female joint member 30 is formed with a female threaded hole 36 instead of the bolt insertion hole 34. The pin hole 15 is a cylindrical hole, and its inner diameter is formed to be smaller than the inner diameter of the female threaded hole 36.

[0026] The fixing pin 40 has a pin portion 41 that can be inserted into the pin hole 15 of the male joint member 10, and a male threaded portion 42 that can be screwed into the female threaded hole 36 of the female joint member 30. A hexagonal hole 43 is formed in the end of the fixing pin 40 on the male threaded portion 42 side.

[0027] The fixing pin 40 is inserted into the female threaded hole 36 from the outer periphery of the female joint member 30 with the pin portion 41 facing the female threaded hole 36. Then, a rotating tool such as a hexagonal wrench is inserted into the hexagonal hole 43 to rotate the fixing pin 40 and screw the male threaded portion 42 into the female threaded hole 36, whereby the pin portion 41 is inserted into the pin hole 15 of the male joint member 10 through the female threaded hole 36. As a result, the male joint member 10 and the female joint member 30 are fixed in close contact with each other, and the joint structure 101 for the steel pipe pile is completed.

[0028] It should be noted that the joint structure 100 of the steel pipe pile described based on Figures 1 to 10 shows one example of the joint structure of the steel pipe pile according to the present invention, and the joint structure of the steel pipe pile according to the present invention is not limited to the joint structure 100 of the steel pipe pile described above. [Industrial Applicability]

[0029] INDUSTRIAL APPLICABILITY The joint structure of a steel pipe pile according to the present invention can be widely used in industrial fields such as the civil engineering and construction industry. [Explanation of symbols]

[0030] 10 Male coupling member 10a Cavity 10c,31c axis center 11 Pile fixation part 11a Top side 11b Bottom side 11d,31d Outer diameter 12 Convex joint 12a Tip surface 12d,32d Minimum outer diameter 12D maximum outer diameter 13 Convex joint 13d outer diameter 13w surrounding wall 14 Female thread hole 15 Pin hole 20 Volts 21 Head 30 Female joint member 31 Cylinder 31a End face 32 Concave mating part 32D Maximum inner diameter 33 Concave joint 33w surrounding wall 34 Bolt insertion hole 33d inner diameter 35 Counterbore 36 Female thread hole 40 Fixing pin 41 Pin section 42 Male thread 43 Hexagonal hole 100,101 Joint structure of steel pipe pile P1,P2 Steel pipe pile

Claims

1. A male joint member having a flange-shaped pile fixing portion, a polygonal cylindrical convex joint portion protruding in the axial direction from one surface of the pile fixing portion, a cylindrical convex joint portion protruding in the axial direction from the tip of the convex joint portion, and a plurality of female screw holes opened toward the axial center of the joint portion on the peripheral wall of the convex joint portion; a female coupling member having a concave joint portion and a concave mating portion formed along the axial direction inside a cylindrical body so that the convex joint portion and the convex mating portion of the male coupling member are fitted in an internally contacting state, and bolt insertion holes are opened in the peripheral wall of the concave joint portion of the cylindrical body in the same number as the female screw holes, A joint structure for a steel pipe pile, characterized in that the convex joint portion and the convex mating portion of the male joint member are fitted into the concave joint portion and the concave mating portion of the female joint member, and a bolt is screwed into the female threaded hole of the male joint member from the outer periphery side of the female joint member through the bolt insertion hole.

2. A male joint member having a flange-shaped pile fixing portion, a polygonal cylindrical convex joint portion protruding in the axial direction from one surface of the pile fixing portion, a cylindrical convex joint portion protruding in the axial direction from the tip of the convex joint portion, and a plurality of pin holes opened in the peripheral wall of the convex joint portion toward the axial center of the joint portion; a female coupling member having a concave joint portion and a concave mating portion formed along the axial direction inside a cylindrical body for fitting the convex joint portion and the convex mating portion of the male coupling member in an inscribed state, and female screw holes opened in the peripheral wall of the concave joint portion of the cylindrical body in the same number as the pin holes; a fixing pin having a pin portion that can be inserted into a pin hole of the male coupling member through the female screw hole from an outer circumferential side of the female coupling member, and a male screw portion that can be screwed into the female screw hole, A joint structure for a steel pipe pile, characterized in that the convex joint portion and the convex engagement portion of the male joint member are fitted into the concave joint portion and the concave engagement portion of the female joint member, and the pin portion of the fixing pin is inserted into the pin hole of the male joint member through the female threaded hole from the outer periphery of the female joint member while the male threaded portion of the fixing pin is screwed into the female threaded hole of the female joint member.

3. 2. A joint structure for a steel pipe pile according to claim 1, wherein a counterbore is provided in the bolt insertion hole for embedding the head of the bolt.

4. The maximum outer diameter of the convex joint portion is smaller than the outer diameter of the pile fixing portion of the male joint member, and the outer diameter of the convex joint portion is smaller than the minimum outer diameter of the convex joint portion, 4. A joint structure for a steel pipe pile according to claim 1, wherein an outer diameter of the fastening portion of the male joint member is equal to an outer diameter of the cylindrical body of the female joint member.

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