JP2016089354A - Pile joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile joint structure having a high shearing resistance, and a reliable rotating torque transmitting function without increasing its cost.SOLUTION: The pile joint structure includes joint end plates 20, 21 provided on the pile head (joint end) of a steel pipe pile 10 located on the lower side, and on the front end (joint end) of a steel pipe pile 11 located on the upper side and joined to the pile head of the steel pipe pile 10, respectively, a connection member 30 connecting outer peripheral portions 20a, 21a of the joint end plates 20, 21 protruded to the radial outsides of the steel pipe piles 10, 11 to each other in their axial directions, elliptical grooved parts 20c, 21c provided in abutting faces 20b, 21b of the joint end plates 20, 21, and each having a center corresponding to an axial center C of the steel pipe piles 10, 11, and an elliptical torque transmitting ring member 40 fitted into the grooved parts 20c, 21c, and having a center corresponding to the axial center C of the steel pipe piles 10, 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint structure such as a steel pipe pile that rotates and penetrates into the ground and a pile that rotates around an axis.

  When building a foundation for a ground structure by penetrating the pile into the ground support layer, multiple piles are added according to the depth to the support layer. For pile extension, it is common to connect piles by welding, but welding requires advanced welding technology and is often performed outdoors, so it is easily affected by the weather. When the diameter increases, there is a problem that the amount of welding increases and it takes time.

  In order to solve the above problems, various techniques for joining piles without welding have been developed. For example, a flange is provided at each end of the upper and lower piles to be joined, and a split inner ring that is integrated by tightening the upper and lower flanges in the longitudinal direction of the pile is externally fitted to the upper and lower flanges. A non-welded joint structure for a pile is proposed in which a cylindrical taper is provided on the outer peripheral surface of the pile, and an outer ring having an inner diameter taper fitted to the cylindrical taper is fitted and the inner ring is tightened to join the upper and lower piles. (See Patent Document 1 and Patent Document 2).

  In addition, in the above-described weldless joint structure, a joint structure improved so as to be able to resist shearing force (see Patent Documents 3 and 4) has also been proposed.

  Any of the above-mentioned welded joint structures is suitable when an external force is applied only in the axial direction of the pile during the construction of the pile. Although it is equipped with, it is weak in strength and is not sufficient as a function to transmit rotational torque.

  Therefore, a non-welded joint structure suitable for a steel pipe pile that rotates and penetrates into the ground has been proposed (see Patent Document 5). In this non-welded joint structure, flanges are provided at the respective ends of the upper and lower steel pipe piles to be joined, and the outer periphery of the flange is externally fitted to the first ring divided in two and the outer diameter taper. A pile coupling structure with a second ring to be tightened is provided, and an arc-shaped piece is protruded in the direction of the pile axis by welding on the inner circumferential portion of each flange and fixed along the circumference (FIG. 1, Patent Document 5). 2), the circumferential end surfaces of the arc-shaped pieces fixed to the upper and lower flanges are arranged so as to face each other through a slit.

Japanese Utility Model Publication No. 3-83224 Utility Model Registration No. 2572753 Japanese Patent Laid-Open No. 11-190020 JP 2007-16446 A JP 2009-191522 A

  However, the non-welded joint structure requires high-quality welding in order to reliably transmit the rotational torque via the arc-shaped piece during the rotation penetration into the ground during the construction of the pile. Further, it is required that the arc-shaped pieces are accurately arranged and welded to the inner peripheral portions of the flanges so that the circumferential end surfaces of the arc-shaped pieces of the upper and lower steel pipe piles face each other through a slit. For this reason, it has the subject that manufacturing cost rises. Even if the welding position error of the arc-shaped piece slightly exceeds the size of the slit, the circumferential end surfaces of the arc-shaped pieces of the upper and lower steel pipe piles collide with each other, and the upper and lower steel pipe piles cannot be joined. There is a fear. Then, it is necessary to take measures such as correcting the fixing position of the arc-shaped piece at the construction site.

  It is an object of the present invention to provide a pile joint structure having a high shear resistance and a reliable rotational torque transmission function without increasing costs.

  The pile joint structure according to claim 1 of the present invention includes a joint end plate provided at each joint end of the pile to be joined and an outer peripheral portion of the joint end plate protruding outward in the radial direction of the pile. A connecting member that is connected to each other in the axial direction of the pile, a non-circular groove portion whose center coincides with the axial center of the pile, and a center that is fitted in the groove portion. And a non-circular torque transmission ring member that coincides with the axis of the pile.

  The pile joint structure according to claim 3 of the present invention includes a joint end plate provided at each joint end portion of the pile to be joined and an outer peripheral portion of the joint end plate protruding outward in the radial direction of the pile. A connecting member connected to each other in the axial direction of the pile, a non-circular groove having a center coincident with the axial center of the pile, provided on one of the abutting surfaces of the joint end plate, and the other of the abutting surfaces And a non-circular torque transmitting ridge portion fitted in the groove portion, the center of which coincides with the axis of the pile.

  According to the present invention, the non-circular torque transmission ring member and the torque transmission ridge are fitted into the non-circular groove, and the torque is the groove, the torque transmission ring member, and the torque transmission ridge. It can be received at the entire contact area, avoiding the concentrated transmission of torque transmission force, has high shear resistance against torque, and exhibits a reliable torque transmission function without increasing costs. It is possible. In addition, the torque transmission ring member or torque transmission ridge part fitted in the groove part gives a large shear resistance force to the joint part against the axial shear force generated at the joint part due to the axial bending external force acting on the pile. It is possible to provide a joint structure having shear resistance.

The 1st Example of the joint structure of the pile of this invention is shown, (a) is a top view which shows the butt | matching surface of the joint end plate provided in the pile head which is a junction edge part of a lower pile among upper and lower piles, b) is a longitudinal sectional view showing the joint locations of the upper and lower piles, and (c) is an enlarged partial sectional view showing a state in which a torque transmission ring member is fitted in a groove provided on each abutting surface of the joint end plate. The modification of the joint structure of the pile shown in FIG. 1 is shown, (a) is a top view which shows the butt | matching surface of the joint end plate provided in the pile head which is a joining edge part of a lower pile among upper and lower piles, (b) ) Is a vertical cross-sectional view showing joint locations of the upper and lower piles, and (c) is an enlarged partial cross-sectional view showing a state in which a torque transmission ring member is fitted in a groove provided on each abutting surface of the joint end plate. The 2nd Example of the joint structure of the pile of this invention is shown, (a) is a top view which shows the butt | matching surface of the joint end plate provided in the pile head which is a joining edge part of a lower pile among upper and lower piles, b) is a longitudinal cross-sectional view showing the joint location of the upper and lower piles, and (c) is a torque transmission ridge provided integrally on one abutting surface of the joint end plate and fitted in a groove provided on the other abutting surface. It is an expanded partial sectional view which shows a state.

  1st Example of the joint structure of the pile of this invention is described with reference to Fig.1 (a), (b), (c). The joint structure of the first embodiment includes a pile head (joint end) of the steel pipe pile 10 located below and a steel pipe pile 11 located above that is joined (joined) to the pile head of the steel pipe pile 10. Joint end plates 20 and 21 provided at the front end portions (joint end portions) and outer peripheral portions 20a and 21a projecting radially outward of the steel pipe piles 10 and 11 of the joint end plates 20 and 21 in the axial direction A connecting member 30 to be connected to each other, elliptical grooves 20c and 21c provided on the respective butting surfaces 20b and 21b of the joint end plates 20 and 21 and having centers coincident with the axis C of the steel pipe piles 10 and 11, and An elliptical torque transmission ring member 40 having a center that coincides with the axis C of the steel pipe piles 10 and 11 is also provided.

  For example, a substantially one-turn spiral blade (not shown) is provided on the outer peripheral surface of the tip portion of the steel pipe pile 10 positioned below, and the steel pipe pile 10 is rotationally propelled into the ground by the spiral blade.

  The joint end plates 20 and 21 are made of a steel plate, the joint end plate 20 is fixed to the pile head of the steel pipe pile 10, and the joint end plate 21 is fixed to the tip of the steel pipe pile 21 by welding or the like. The groove 20c is formed on the abutting surface 20b of the joint end plate 20, and the groove 21c is formed on the abutting surface 21b of the joint end plate 21 by cutting (grooving), respectively. The torque transmission ring member 40 is formed in an elliptical shape by, for example, forming a steel ring. The axial length (height) of the torque transmission ring member 40 is set to a dimension substantially equal to the sum of the depths of the groove portions 20c and 21c, and the joint end plate with the butted surfaces 20b and 21b facing each other. When the 20 and 21 are overlapped, no gap is formed between the butted surfaces 20b and 21b. By fitting the elliptical torque transmission ring member 40 into the elliptical grooves 20c and 21c, the torque transmission ring member 40 shears in the circumferential direction around the axis C of the steel pipe piles 10 and 11. It plays the role of a resistance key, and it becomes possible to reliably transmit the rotational force (torque) from the steel pipe pile 11 to the steel pipe pile 10.

  The connecting member 30 is composed of a combination of inner rings 31 and 31 and an outer ring 32 that are divided into two in the circumferential direction. The inner peripheral surface of each inner ring 31 is provided with a circumferential groove 33 that sandwiches the outer peripheral portions 20a and 21a of the joint end plates 20 and 21 in an overlapped state. The outer peripheral surface of each inner ring 31 is tapered such that the outer diameter decreases toward the steel pipe pile 10 side (downward) and the outer diameter increases toward the steel pipe pile 20 side (upward). The inner peripheral surface of the outer ring 32 is provided with a taper that fits into the outer peripheral surface of the inner rings 31, 31. The steel pipe piles 10 and 11 are connected to each other in the axial direction by fitting the outer ring 32 into the inner rings 31 and 31 divided into two with the outer circumferential portions 20a and 21a being sandwiched in the circumferential grooves 33, respectively. In addition, although the case where it comprised by the combination of the inner rings 31 and 31 and the outer ring 32 which divided the connection member 30 in 2nd Example was shown, it is not limited to this.

  In the joint structure of the pile of the first embodiment, for example, when the steel pipe pile 10 and the steel pipe pile 11 are joined (joined), for example, a joint end plate fixed to the pile head of the steel pipe pile 10 that rotates and penetrates into the ground The torque transmission ring member 40 is fitted into the 20 circumferential grooves 20c. The fitted torque transmission ring member 40 is in a state in which a part of the axial direction protrudes from the abutting surface 20b. And the steel pipe pile 11 is positioned so that the portion of the torque transmission ring member 40 protruding from the abutting surface 20b of the joint end plate 21 fixed to the tip part of the steel pipe pile 11 may be fitted into the groove part 21c. 11 is lowered onto the pile head of the steel pipe pile 10. As a result, the torque transmission ring member 40 is also fitted into the groove 21c, and the abutting surfaces 20b and 21b are overlapped with no gap. Thereafter, the outer peripheral portions 20 a and 21 a of the joint end plates 20 and 21 are fitted into the circumferential grooves 33 of the inner rings 31, and the outer ring 32 is fitted into the outer peripheral surfaces of the inner rings 31 and 31. As a result, the steel pipe piles 10 and 11 can be reliably rotated from the steel pipe pile 11 to the steel pipe pile 10 via the torque transmission ring member 40 and the grooves 20c and 21c in addition to being joined to each other in the axial direction by the connecting member 30. (Torque) can be transmitted.

  According to the pile joint structure of the first embodiment, when torque is transmitted, the torque of the steel pipe pile 11 acts on the torque transmission ring member 40 via the contact portion between the groove 21c and the torque transmission ring member 40, and torque transmission. It acts on the steel pipe pile 10 through the contact portion between the ring member 40 and the groove portion 20c, and the torque transmission force is locally concentrated in the configuration in which the torque transmission force is received by the entire contact portion. It can be avoided and exhibits high shear resistance against torque. In addition, the torque transmission ring member 40 fitted in the groove portions 20c and 21c exerts a large shear resistance against the axial shear force generated at the joint due to the axial bending external force acting on the steel pipe piles 10 and 11, and exhibits high shear resistance. A joint structure having resistance is obtained. Furthermore, high-quality welding is not required, and the grooves 20c and 21c and the torque transmission ring member 40 can be prepared in advance at the factory, and the torque transmission ring member 40 is fitted into the grooves 20c and 21c at the construction site. It is possible not only to reduce the manufacturing cost but also to reduce the construction cost.

  2 (a), 2 (b), and 2 (c) show modified examples of the pile joint structure of the first embodiment. In the figure, the same parts as those shown in FIGS. 1A, 1B, and 1C are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this modification, as shown in FIG. 2A, the centers of the groove portions 200c and 210c formed on the butted surfaces 20b and 21b of the joint end plates 20 and 21 coincide with the axis C of the steel pipe piles 10 and 11. The torque transmission ring member 41 fitted in the grooves 200c and 210c has a hexagonal shape whose center coincides with the axis C of the steel pipe piles 10 and 11 as well. About parts other than these, it is the same as the joint structure of the pile of a 1st Example.

  The axial length of the torque transmission ring member 41 is set to be approximately equal to the total depth of the grooves 200c and 210c, and the joint end plates 20 and 21 are placed with the butted surfaces 20b and 21b facing each other. When superposed, there is no gap between the butted surfaces 20b and 21b. By fitting the hexagonal torque transmission ring member 41 into the same hexagonal grooves 200c and 210c, the torque transmission ring member 41 has a circumferential rotational force around the axis C of the steel pipe piles 10 and 11. It plays the role of a shear resistance key, and it is possible to reliably transmit the rotational force (torque) from the steel pipe pile 11 to the steel pipe pile 10.

  In this modified example as well, the torque of the steel pipe pile 11 is transferred to the torque transmission ring member 41 via the contact portion between the groove portion 210c and the torque transmission ring member 41 during torque transmission, as in the joint structure of the pile of the first embodiment described above. It acts on the steel pipe pile 10 through the contact portion between the torque transmission ring member 41 and the groove portion 200c, and the torque transmission force is locally received by the configuration in which the torque transmission force is received by the entire contact portion. It is possible to avoid concentrating on the surface and to exhibit high shear resistance against torque. In addition, the torque transmission ring member 41 fitted in the grooves 200c and 210c exhibits a large shear resistance against the axial shear force generated at the joint due to the axial bending external force acting on the steel pipe piles 10 and 11, and exhibits high shear resistance. A joint structure having resistance is obtained. Furthermore, high-quality welding is not required, and the grooves 200c and 210c and the torque transmission ring member 41 can be prepared in advance at the factory, and the torque transmission ring member 41 is fitted into the grooves 200c and 210c at the construction site. It is possible not only to reduce the manufacturing cost but also to reduce the construction cost.

  Fig.3 (a), (b), (c) has shown the 2nd Example of the joint structure of the pile of this invention. In the figure, the same parts as those shown in FIGS. 1A, 1B, and 1C are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the joint structure of the pile of the second embodiment, the center C of the steel pipe piles 10 and 11 is centered on, for example, the abutting face 20b of the joint end plate 20 among the abutting faces 20b and 21b of the joint end plates 20 and 21. An elliptical torque transmission ridge portion 20d that coincides with the torque transmission ridge portion 20d is provided, and the torque transmission ridge portion 20d is fitted into the groove portion 21c of the joint end plate 21 to transmit the torque, thereby omitting the torque transmission ring member 40. The point which is doing is different from the joint structure of the pile of the first embodiment described above, and the other parts are the same.

  The torque transmission ridge portion 20d is formed integrally with the joint end plate 20 by, for example, cutting the butt surface 20b of the joint end plate 20 in advance. The height of the torque transmitting ridge portion 20d from the abutting surface 20b is set substantially equal to the depth of the groove portion 21c, and when the abutting surface 21b is superimposed on the abutting surface 20b, no gap is generated between the abutting surfaces 20b and 21b. It is like that. By fitting the elliptical torque transmission ridge portion 20d into the same elliptical groove portion 21c, the torque transmission ridge portion 20d is sheared in the circumferential rotational force about the axis C of the steel pipe piles 10 and 11. It plays the role of a resistance key, and it becomes possible to reliably transmit the rotational force (torque) from the steel pipe pile 11 to the steel pipe pile 10.

  In the joint structure of the pile according to the second embodiment, when the steel pipe piles 10 and 11 are joined, for example, the steel pipe is attached to the butt surface 20b of the joint end plate 20 fixed to the pile head of the steel pipe pile 10 that is rotationally inserted into the ground. The steel pipe pile 11 is positioned so that the torque transmission ridge 20d protruding from the abutting surface 20b is fitted into the groove 21c of the joint end plate 21 fixed to the tip of the pile 11, and the tip of the steel pipe pile 11 is positioned. The part is lowered onto the pile head of the steel pipe pile 10. Thereafter, the outer peripheral portions 20a and 21a of the joint end plates 20 and 21 are fitted into the peripheral grooves 33 of the inner rings 31 in the same manner as in the first embodiment, and the outer ring 32 is attached to the outer peripheral surfaces of the inner rings 31 and 31. Fit. Thereby, the steel pipe piles 10 and 11 are reliably joined to the steel pipe pile 10 from the steel pipe pile 11 via the torque transmission protrusion part 20d and the groove part 21c, in addition to being joined to each other in the axial direction by the connecting member 30. (Torque) can be transmitted.

  According to the joint structure of the pile of the second embodiment, when torque is transmitted, the torque of the steel pipe pile 11 acts on the steel pipe pile 10 via the contact portion between the groove portion 21c and the torque transmission ridge portion 20d. In the configuration where the torque transmission force is received by the entire contact portion, the concentrated torque transmission force can be avoided as in the case of the first embodiment, and a high shear resistance against the torque is exhibited. To do. In addition, the torque transmission protrusion 20d fitted in the groove 21c exhibits a large shear resistance against the axial shear force generated at the joint due to the axial bending external force acting on the steel pipe piles 10 and 11, and exhibits high shear resistance. The joint structure has a force. Further, the torque transmission protrusion 20d is integrally formed on the abutting surface 20b of the joint end plate 20, the torque transmission ring member 40 can be omitted, and the number of parts can be reduced. It has sufficient resistance strength (mechanical strength). Furthermore, high-quality welding is not required, and the groove 21c and the torque transmission ridge 20d can be prepared in advance at the factory, and the torque transmission ridge 20d is fitted into the groove 21c at the construction site. Therefore, it is possible to further reduce manufacturing costs and construction costs.

  In the joint structure of the piles of the first embodiment and the second embodiment, elliptic grooves 20c and 21c whose center coincides with the axis C of the steel pipe piles 10 and 11, the torque transmission ring member 40, and the torque transmission protrusions. In the modification, torque is transmitted via hexagonal grooves 200c and 210c whose center coincides with the axis C of the steel pipe piles 10 and 11 and the torque transmission ring member 41. Although cases have been shown, the present invention is not limited to these. The groove portions 20c, 21c, 200c, 210c, the torque transmission ring members 40, 41, and the torque transmission ridge portion 20d may be any noncircular shape whose center coincides with the axis C of the steel pipe piles 10, 11. If it is non-circular, the torque transmission ring members 40 and 41 may be fitted into the grooves 20c, 21c, 200c, and 210c, or the torque transmission ridges 20d may be fitted into the grooves 21c, even if they are not elliptical or hexagonal. When it does, steel pipe piles 10 and 11 do not rotate mutually centering on the axis C.

  The pile joint structure of the present invention is applied when it is required to transmit torque reliably or when a large shearing force acts on the joint.

10, 11 Steel pipe piles 20, 21 Joint end plates 20a, 21a Outer peripheral portions 20b, 21b Abutting surfaces 20c, 21c Grooves 200c, 210c Grooves 20d Torque transmission ridges 30 Connecting members 40, 41 Torque transmission ring members

Claims (4)

A joint end plate provided at each joint end of the pile to be joined;
A connecting member that connects the outer peripheral portions of the joint end plates protruding outward in the radial direction of the pile to each other in the axial direction of the pile,
A non-circular groove portion provided at each abutting surface of the joint end plate, the center of which coincides with the axis of the pile;
A pile joint structure comprising: a non-circular torque transmission ring member that is fitted in each of the groove portions and has a center coincident with the axis of the pile. In the joint structure of the pile according to claim 1,
The non-circular groove is an elliptic groove whose center coincides with the axis of the pile,
The pile joint structure according to claim 1, wherein the non-circular torque transmission ring member is an elliptical torque transmission ring member whose center coincides with an axis of the pile. A joint end plate provided at each joint end of the pile to be joined;
A connecting member that connects the outer peripheral portions of the joint end plates protruding outward in the radial direction of the pile to each other in the axial direction of the pile,
A non-circular groove portion provided at one of the butted surfaces of the joint end plate, the center of which coincides with the axis of the pile;
A pile joint structure, comprising: a non-circular torque transmitting ridge portion provided at the other of the abutting surfaces and fitted in the groove portion, the center of which coincides with the axis of the pile. . In the joint structure of the pile according to claim 3,
The non-circular groove is an elliptic groove whose center coincides with the axis of the pile,
The pile joint structure according to claim 1, wherein the non-circular torque transmission ridge portion is an elliptic ridge portion whose center coincides with an axis of the pile.