JP5053828B2 - Joint structure - Google Patents

Description

  The present invention relates to a joint structure.

  Conventionally, when a building or structure is constructed on the ground where the ground strength near the ground surface is not sufficient, a deep foundation such as a pile foundation has been used to transmit the load of the building or structure to a deep support layer in the ground. It has been. The piles used in this pile foundation include, for example, steel pipe piles, and in recent years, the construction method of embedding them in the ground while rotating and penetrating steel pipe piles with, for example, spiral wings at the tip has been environmentally friendly. It attracts attention from a viewpoint.

  By the way, when a pile is buried in a deep support layer in the ground, it is necessary to bury it in the ground while connecting a fixed-length pile at a work site due to constraints during transportation and convenience of driving. In addition to the cases described above, connection of piles at the work site may be required depending on the environment at the work site. Furthermore, the columns and beams of the structure may be similarly required to be connected at the work site.

  The connection methods of these structural members include a connection method using on-site welding and a connection method using mechanical joints. In the connection method using on-site welding, it is necessary to arrange workers having a predetermined skill qualification for welding work. Therefore, there is a problem that the cost is increased and the welding work including the quality control test requires a considerably long time, so that the construction amount per day is reduced. For this reason, in recent years, connection methods using mechanical joints have been widely adopted.

As this mechanical joint, for example, Patent Document 1 discloses a joint structure that joins a pile by covering an insertion hole of a lower pipe with a receiving hole of the upper pipe and passing the lower pipe and the upper pipe through and fixing with bolts and nuts. Proposed. Further, for example, Patent Document 2 proposes a joint structure in which a first joint portion and a second joint portion are sandwiched between fastening members, and the fastening members are fixed with bolts and nuts to join the piles.
JP 2003-64665 A JP 2007-205134 A

  However, in the joint structure disclosed in Patent Document 1, since the first nut and the second nut are screwed together with the through bolt, the through bolt greatly protrudes from the outer peripheral surface of the pile body. For this reason, when the pile is rotated and penetrated into the ground, the ground on the circumferential surface of the pile is disturbed, and there is a problem that the circumferential frictional force is reduced. Furthermore, due to the resistance of the ground around the pile, loosening of nuts and deformation of through bolts may occur, and the required joint strength may not be expected.

  Further, in the joint structure disclosed in Patent Document 2, the fastening member is loosely temporarily attached, the first joint portion and the second joint portion are brought into contact with each other, and the fastening member is tightened by tightening the bolt. And the second protrusion. At this time, the clamping recess of the fastening member formed in a taper shape and the first and second ridges formed in a taper shape span substantially the entire clamping surface only with the bolt tightening force. Therefore, there is a problem of whether it is possible to ensure the processing accuracy and mounting accuracy of the members necessary to enable contact with a required coupling force. Furthermore, as the bolt length, it is necessary to lengthen the length corresponding to the protruding width of the ridge, and it will protrude from the outer peripheral surface of the lower pile material by that amount, so the pile is rotated into the ground. When doing so, the nut may loosen and the required joint strength may not be expected.

  This invention is made | formed in view of the said situation, The objective can connect the load which acts on a coupling reliably while being able to perform the connection operation | work of structural members, such as a pile, safely and easily. An object of the present invention is to provide a joint structure having sufficient strength.

(1) The present invention is a joint structure for connecting a first structural member and a second structural member,
A first connecting member having one end fixed to one end of the first structural member;
A cylindrical second connection member, one end of which is fixed to one end side of the second structural member, and the first connection member is inserted from the opening of the other end;
A key fitting recess formed on the outer peripheral surface of the side surface of the first connecting member;
A side portion of the second connecting member, a key fitting hole formed at a position corresponding to the key fitting recess;
A key comprising the key fitting recess and the key fitting hole in a state where the first connecting member is inserted into the second connecting member and the key fitting recess matches the key fitting hole. A key member for fixing the first connection member and the second connection member by being fitted into the fitting portion;
The second connection member has one end fixed to one end side of the second structural member in a state where one end of the second structural member is inserted from an opening at one end.
The first connecting member is inserted into the second connecting member until the other end contacts one end of the second structural member,
In a state where the other end of the first connection member and one end of the second structural member are in contact with each other, the positions of the key fitting recess and the key fitting hole coincide with each other in the axial direction. To do.

  According to the present invention, since the first connecting member and the second connecting member are fixed in a state where the first connecting member is inserted into the second connecting member, the joint becomes a double pipe structure, and the pile A sufficient bending strength can be ensured for structural members such as. According to the invention, since the key member is fitted into the key fitting portion including the key fitting recess and the key fitting hole, the first connecting member and the second connecting member are fixed. However, it is possible to ensure a sufficient torsional strength against the torque acting when the structural member is inserted and withdrawn, and to sufficiently resist compression and tension. Furthermore, according to the present invention, the first connecting member and the second connecting member can be fixed by a simple operation of fitting the key member into the key fitting portion including the key fitting recess and the key fitting hole. The construction time required for connecting structural members such as piles can be shortened.

The joint structure of the or invention, the second connecting member has one end to one end of said second structural member is fixed in a state where one end of said second structural member is inserted from the opening portion of one end The first connecting member is inserted into the second connecting member until the other end contacts the one end of the second structural member, and the other end of the first connecting member and the second structure are inserted. In a state where one end of the member is in contact with each other, the positions of the key fitting recess and the key fitting hole coincide with each other in the axial direction. Therefore, in addition to the key member, the first connecting member is also compressed. Since it resists, the intensity | strength of the whole coupling can be improved. In addition, when the other end of the first connecting member and one end of the second structural member are in contact with each other, the key fitting recess and the key fitting hole are aligned in the axial direction. And the key fitting hole can be easily matched, and the construction time required for connecting structural members such as piles can be further shortened.

( 2 ) The joint structure of the present invention further includes a third connection member attached to the outer peripheral surface of the side surface portion of the second connection member, and the key member has a bolt head having the third connection member. In a state of being located inside the first bolt through hole formed in the bolt, the bolt hole is formed in the screw hole formed in the bottom portion of the key fitting recess through the second bolt through hole formed in the key member. The third connecting member is fixed to the outer peripheral surface of the side surface of the second connecting member by locking the head of the bolt inside the first bolt through hole. May be.

  If it does in this way, drop-off of the key member from a key insertion part can be prevented. In particular, in a state where the head portion of the bolt is located inside the first bolt through hole formed in the third connecting member, the key fitting recess is formed via the second bolt through hole formed in the key member. Because it is fixed to the screw hole formed at the bottom with a bolt, when a structural member such as a pile is buried in the ground, it prevents the occurrence of a situation where a stone hits the head of the bolt and the bolt loosens. can do. Furthermore, since the head of the bolt can be guarded by the third connecting member, the diameter of the second bolt through hole formed in the key member can be reduced, and the size of the key member can be reduced. Can do. For this reason, cross-sectional defects, such as a key fitting recessed part formed in the 1st connection member, and a key fitting hole formed in the 2nd connection member, can be made small, and the 1st connection member and the 2nd A decrease in strength of the connecting member can be prevented.

  Hereinafter, an embodiment of the present invention (this embodiment) will be described. In addition, this embodiment described below does not unduly limit the content of the present invention described in the claims. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the invention.

1. 1. First embodiment 1-1. Configuration of Joint FIG. 1 shows a state in which a first steel pipe pile 20 (an example of a first structural member) and a second steel pipe pile 30 (an example of a second structural member) are connected by a joint 10 of the present embodiment. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. However, in FIG. 1 and FIG. 2, illustration of the lower end of the first steel pipe pile 20 and the upper end of the second steel pipe pile 30 is omitted.

  The joint 10 of this embodiment is a steel joint, and as shown in FIGS. 1 to 3, the first connection member 40, the second connection member 50, the key member 60, and the third connection member. 70 and a bolt 80.

  The joint 10 of this embodiment connects the 1st steel pipe pile 20 and the 2nd steel pipe pile 30, and specifically, it fixes to the upper end of the 1st steel pipe pile 20 embed | buried in the ground. By fixing the 1st connecting member 40 made and the 2nd connecting member 50 fixed to the lower end of the 2nd steel pipe pile 30 using the key member 60 grade | etc., And the 1st steel pipe pile 20 The second steel pipe pile 30 is connected. The same work is performed on the second steel pipe pile 30 in which the connected first steel pipe pile 20 and the second steel pipe pile 30 are further buried in the ground and the first connecting member 40 is fixed to the upper end. I do. A long steel pipe pile is formed by repeating this operation.

  Hereinafter, the assembly process of the joint 10 of the present embodiment will be described with reference to FIGS. 4 to 11, and each member constituting the joint 10 of the present embodiment will be described in detail.

  4 is a perspective view schematically showing the structure of the first connecting member 40 and the second connecting member 50, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. However, in FIGS. 4-5, illustration of the lower end of the 1st steel pipe pile 20 and the upper end of the 2nd steel pipe pile 30 is abbreviate | omitted.

  As shown in FIGS. 4 and 5, the first connecting member 40 is formed in a cylindrical shape. In addition, key fitting recesses 41 are formed on the outer peripheral surface of the side surface portion 43 of the first connecting member 40 at predetermined positions facing each other in two directions orthogonal to the radial direction of the first connecting member 40. A screw hole 42 penetrating toward the inner peripheral surface of the side surface portion 43 is formed at the bottom of the key fitting recess 41.

  The lower end of the first connecting member 40 is fixed to the upper end of the first steel pipe pile 20 by welding at the welded portion 48. In addition, welding with the 1st connection member 40 and the 1st steel pipe pile 20 is performed beforehand in the factory etc., and the 1st connection member 40 and the 1st steel pipe pile 20 are welded in the construction site. It is carried in the state that was done.

  Moreover, the outer diameter of the 1st connection member 40 is equal to the outer diameter of the 1st steel pipe pile 20 or the 2nd steel pipe pile 30, and the internal diameter of the 1st connection member 40 is the 1st steel pipe pile. 20 and the inner diameter of the second steel pipe pile 30 are smaller. That is, the first connecting member 40 has a thicker member thickness (a) than the member thickness (t1) of the first steel pipe pile 20 and the member thickness (t2) of the second steel pipe pile 30. (A> t1, a> t2, t1 = t2). The member thickness (t1) of the first steel pipe pile 20 may be thicker than the member thickness (t2) of the second steel pipe pile 30 (t1> t2), or the member of the second steel pipe pile 30. The thickness (t2) may be thicker than the member thickness (t1) of the first steel pipe pile 20 (t1 <t2).

  Thus, in this embodiment, the member thickness (a) of the first connecting member 40 is made thicker than the member thickness (t1) of the first steel pipe pile 20 and the member thickness (t2) of the second steel pipe pile 30. (Specifically, the member thickness (a ′) of the first connecting member 40 excluding the cross-sectional defect (key fitting recess 41) is set to the member thickness (t1) of the first steel pipe pile 20 and the second Since the member thickness (t2) of the steel pipe pile 30 is larger (a ′> t1, a ′> t2), the first connecting member 40 is connected to the steel pipe pile main body (for example, the first connected by the joint 10). It can be set as the member exceeding the bending strength of the 1 steel pipe pile 20 and the 2nd steel pipe pile 30).

  As shown in FIGS. 4 and 5, the second connecting member 50 is formed in a cylindrical shape whose inner diameter and outer diameter are slightly larger than those of the second steel pipe pile 30 and the first connecting member 40. Specifically, as shown in FIG. 5, the inner diameter of the second connecting member 50 and the outer diameter of the second steel pipe pile 30 and the outer diameter of the first connecting member 40 are inscribed. Yes.

  Further, the side surface portion 54 of the second connection member 50 has predetermined positions facing each other in two directions orthogonal to the radial direction of the second connection member 50 and corresponding to the key fitting recess 41. A key fitting hole 53 is formed.

  Further, the upper end of the second connecting member 50 is in a state where the lower end of the second steel pipe pile 30 is inserted from the opening 52 at the upper end of the second connecting member 50, and the second steel pipe pile 30 is in the welded portion 59. It is fixed to the lower end side by welding. Specifically, as shown in FIG. 5, the distance (b) from the upper end of the first connection member 40 to the key fitting recess 41 formed in the first connection member 40, and the second steel pipe pile 30. The second connecting member 50 is connected to the second steel pipe pile 30 at a position where the distance (c) from the lower end of the second connecting member 50 to the key fitting hole 53 formed in the second connecting member 50 is equal (b = c). It is fixed by welding. In addition, the welding with the 2nd connection member 50 and the 2nd steel pipe pile 30 is performed beforehand in the factory etc., and the 2nd connection member 50 and the 2nd steel pipe pile 30 are welded in the construction site. It is carried in the state that was done.

  The opening 51 at the lower end of the second connection member 50 has a guide portion 55 that guides insertion of the upper end of the first connection member 40. The outer diameter of the guide portion 55 is equal to the outer diameter of the second connection member 50, but the inner diameter of the guide portion 55 is gradually larger than the inner diameter of the second connection member 50 toward the lower end. (Tapered).

  Thus, in this embodiment, the outer diameter of the guide part 55 at the lower end of the second connection member 50 is equal to the outer diameter of the second connection member 50, but the inner diameter of the guide part 55 is at the lower end. Since it is formed so as to be gradually larger than the inner diameter of the second connection member 50 as it goes, the first connection member 40 is easily inserted into the opening 51 at the lower end of the second connection member 50. be able to.

  6 is a perspective view schematically showing the connection structure between the first connection member 40 and the second connection member 50 and the structure of the key member 60. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. FIG. However, in FIGS. 6-7, illustration of the lower end of the 1st steel pipe pile 20 and the upper end of the 2nd steel pipe pile 30 is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the first steel pipe pile 20 is inserted into the second connection member 50 until the upper end of the first connection member 40 contacts the lower end of the second steel pipe pile 30. The And as above-mentioned, in this embodiment, distance (b) from the upper end of the 1st connection member 40 to the key fitting recessed part 41 formed in the 1st connection member 40, and the 2nd steel pipe pile 30 The second connection member 50 is welded to the second steel pipe pile 30 at a position where the distance (c) from the lower end to the key fitting hole 53 formed in the second connection member 50 is equal (b = c). In the state where the upper end of the first connecting member 40 and the lower end of the second steel pipe pile 30 are in contact with each other, the positions of the key fitting recess 41 and the key fitting hole 53 are the positions of the joint 10. They will coincide in the axial direction.

  At the construction site, the first steel pipe pile 20 is buried in the ground, and the second steel pipe pile 30 is suspended in a rotatable state by a pile driving machine or the like. When the second steel pipe pile 30 to which the second connecting member 50 is welded and fixed is rotated in a state where the lower end of the second steel pipe pile 30 is in contact with the key fitting recess 41 and the key fitting hole. 53 can be matched.

  Thus, in this embodiment, since the upper end of the 1st connection member 40 and the lower end of the 2nd steel pipe pile 30 contact | abut, in addition to the key member 60 mentioned later, the 1st connection member 40 is also against compression. It will resist, and the whole intensity | strength of the coupling 10 can be improved. Further, in a state where the upper end of the first connecting member 40 and the lower end of the second steel pipe pile 30 are in contact, the positions of the key fitting recess 41 and the key fitting hole 53 coincide with each other in the axial direction of the joint 10. Therefore, the operation of matching the key fitting recess 41 and the key fitting hole 53 is facilitated, and the construction time required for connecting the first steel pipe pile 20 and the second steel pipe pile 30 can be shortened. it can.

  Further, in a state where the key fitting recess 41 and the key fitting hole 53 are matched, the second bolt through hole 61 is formed in the key fitting portion 65 composed of the key fitting recess 41 and the key fitting hole 53. By fitting the key member 60, the first connection member 40 and the second connection member 40 are fixed. As shown in FIG. 6, the dimension (d) of the key fitting portion 65 (key fitting recess 41, key fitting hole 53) is such that the key member 60 can be fitted. It is slightly larger than (e) (d> e).

  In the present embodiment, the example in which the key member 60 and the key fitting recess 41 are formed in a square shape has been described, but the key member 60 and the key fitting recess 41 may be formed in a circular shape, a rectangular shape, or an arbitrary shape. However, it is desirable to standardize the shapes of the key member 60 and the key fitting recess 41 with the same dimensions.

  Thus, in this embodiment, since the 1st connection member 40 and the 2nd connection member 50 are fixed in the state where the 1st connection member 40 was inserted in the 2nd connection member 50, a double pipe It becomes a joint of structure, and sufficient bending strength can be guaranteed to the first steel pipe pile 20 and the second steel pipe pile 30. In addition, since the first connecting member 40 and the second connecting member 50 are fixed by fitting the key member 60 into the key fitting portion 65 including the key fitting recess 41 and the key fitting hole 53, the key The member 60 can guarantee sufficient torsional strength against the torque that acts when the first steel pipe pile 20 and the second steel pipe pile 30 are inserted and withdrawn, and sufficiently resists compression and tension. be able to. Further, the first connecting member 40 and the second connecting member 50 can be fixed by a simple operation of fitting the key member 60 into the key fitting portion 65 including the key fitting recess 41 and the key fitting hole 53. The construction time required for the connection between the first steel pipe pile 20 and the second steel pipe pile 30 can be shortened.

  The key member 60 compensates for the cross-sectional defect (the key fitting recess 41) of the first connecting member 40 and the cross-sectional defect (the key fitting hole 53) of the second connecting member 50, and the second steel pipe pile 30. It is necessary to transmit the force acting on the second connection member 50 to the first steel pipe pile 20 via the first connection member 40. Therefore, as the key member 60, it is desirable to use a member having a small deformation when an external force is applied, that is, a member having a predetermined hardness (for example, carbon steel for machine structure or alloy steel for machine structure).

  FIG. 8 is a perspective view schematically showing the connection structure of the first connection member 40, the second connection member 50, and the key member 60 and the structure of the third connection member 70. FIG. It is sectional drawing of IX-IX cross section. However, in FIGS. 8 to 9, illustration of the lower end of the first steel pipe pile 20 and the upper end of the second steel pipe pile 30 is omitted.

  As shown in FIGS. 8 and 9, the third connecting member 70 is formed in a cylindrical shape whose diameter is slightly larger than that of the second connecting member 50. Specifically, as shown in FIG. 9, the inner diameter of the third connecting member 70 and the outer diameter of the second connecting member 50 are inscribed.

  Further, the side surface portion 72 of the third connection member 70 has bolts at predetermined positions facing each other in two directions perpendicular to the radial direction of the third connection member 70 and corresponding to the key fitting portion 65. A first bolt through hole 71 having a diameter larger than that of the head 81 is formed.

  10 is a perspective view schematically showing the connection structure of the first connection member 40, the second connection member 50, the key member 60, and the third connection member 70, and the structure of the bolt 80. FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10. However, in FIGS. 10 to 11, illustration of the lower end of the first steel pipe pile 20 and the upper end of the second steel pipe pile 30 is omitted.

  As shown in FIGS. 10 and 11, the key member 60 is fixed with a bolt 80 to a screw hole 42 formed at the bottom of the key fitting recess 41 of the first connecting member 40 with a bolt 80.

  As shown in FIGS. 2 and 3, the key member 60 is in a state where the head portion 81 of the bolt is located inside the first bolt through hole 71 formed in the third connection member 70. The bolt 80 is fixed to the screw hole 42 formed in the bottom portion of the key fitting recess 41 through the second bolt through hole 61 formed in the key member 60.

  The second bolt through hole 61 has a bolt engaging portion 62 that engages with a bolt head 81, and the bolt engaging portion 62 has a larger diameter than the second bolt through hole 61. It has become. That is, as shown in detail in FIGS. 2 and 3, the key member 60 has a bolt head 81 positioned inside the first bolt through hole 71 formed in the third connection member 70, and With the bolt head 81 engaged with the bolt engaging portion 62, the screw hole 42 formed in the bottom of the key fitting recess 41 through the second bolt through hole 61 formed in the key member 60. Are fixed with bolts 80.

  As described above, in this embodiment, the key member 60 is fixed to the screw hole 42 formed at the bottom of the key fitting recess 41 with the bolt 80 through the second bolt through hole 61 formed in the key member 60. Therefore, it is possible to prevent the key member 60 from falling off the key fitting portion 65. In particular, in the present embodiment, the second bolt through hole formed in the key member 60 in a state where the bolt head 81 is located inside the first bolt through hole 71 formed in the third connecting member 70. When the first steel pipe pile 20 and the second steel pipe pile 30 are buried in the ground, the bolts 80 are fixed to the screw holes 42 formed in the bottom of the key fitting recess 41 via 61. Occurrence of a situation where a stone or the like hits the bolt head 81 and the bolt 80 is loosened can be prevented. Further, since the bolt head 81 can be guarded by the third connecting member 70, the diameter of the second bolt through hole 61 formed in the key member 60 is smaller than the outer diameter of the bolt head 81. Therefore, the dimension of the key member 60 can be reduced. For this reason, cross-sectional defects, such as the key fitting recessed part 41 formed in the 1st connection member 20, and the key fitting hole 53 formed in the 2nd connection member 30, can be made small, and the 1st connection member The strength of the 20 and the second connecting member 30 can be prevented from being lowered.

  As shown in FIGS. 10 and 11, the third connection member 70 is attached to the outer peripheral surface of the side surface portion 54 of the second connection member 50 by a bolt 80.

  Specifically, as shown in FIGS. 2 and 3, the third connecting member 70 locks the bolt head 81 inside the first bolt through hole 71, thereby allowing the second connecting member 50 to be engaged. It is attached to the outer peripheral surface of the side part 54 of the. For this reason, the third connecting member 70 has a function of preventing the key member 60 from dropping off from the key fitting portion 65.

  Since the joint 10 of the present embodiment is configured as described above, it can easily connect a structural member such as a steel pipe pile, and can sufficiently transmit a load acting on the joint 10. And sufficient strength against the load acting on the joint 10.

  In this embodiment, a steel pipe pile has been described as an example of the first structural member and the second structural member. However, the present invention is not limited to this, and the present invention is also applicable to, for example, ready-made concrete piles and structural columns and beams. be able to.

1-2. Method for Embedding Steel Pipe Pile Next, an example of a method for burying the first steel pipe pile 20 and the second steel pipe pile 30 connected by the joint 10 of the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 12 (A), the first steel pipe pile 20 having the cutting edge 21 and the spiral blade 22 attached to the lower end and the first connecting member 40 fixed to the upper end by welding is connected to the pile driving machine 90. In addition to being connected to the rotation drive device 91 equipped in the above, the embedding position is controlled by the swinging device 92 to set the first steel pipe pile 20 vertically.

  Next, as shown in FIG. 12 (B), the first steel pipe pile 20 is rotated clockwise by the rotation drive device 91, and the first steel pipe pile 20 is penetrated into the ground by the driving force of the rotary blades 22. . And the 1st steel pipe pile 20 is embed | buried until the height from the ground surface of the 1st connection member 40 becomes predetermined | prescribed height. The “predetermined height” is a height suitable for the connection work between the first steel pipe pile 20 and the second steel pipe pile 30 by an operator. For example, the height from the ground surface is about 1 meter. The corresponding height is applicable. In addition, you may make it penetrate the 1st steel pipe pile 20 in the ground by rotating the 1st steel pipe pile 20 counterclockwise.

  Next, the connection between the first steel pipe pile 20 and the rotary drive device 91 is released, the second connection member 50 is welded and fixed to the lower end, and the first connection member 40 is welded and fixed to the upper end. The steel pipe pile 30 is suspended by a pile driving machine 90. Then, as shown in FIG. 13A, the second steel pipe pile 30 is connected to the rotary drive device 91, and the second connection member 50 welded and fixed to the lower end of the second steel pipe pile 30 and the first The first steel pipe pile 20 and the second steel pipe pile 30 are connected by fixing the first connection member 40 welded and fixed to the upper end of the steel pipe pile 20 with the key member 60 or the like.

  In addition, in this embodiment, since the upper end of the 2nd steel pipe pile 30 is connected to the rotation drive device 91, the 1st connection member 40 welded and fixed to the upper end of the 1st steel pipe pile 20 is used as the 2nd steel pipe. After inserting from the lower end of the second connecting member 50 fixed to the lower end of the pile 30 by welding, the third connecting member 70 is slid from the upper end of the second steel pipe pile 30 and the side surface portion of the second connecting member 50 54 cannot be attached to the outer peripheral surface.

  Therefore, in the present embodiment, the second connection of the first connection member 40 welded and fixed to the upper end of the first steel pipe pile 20 in a state where the third connection member 70 is temporarily attached to the second steel pipe pile 30. It inserts from the lower end of the 2nd connection member 50 welded and fixed to the lower end of the steel pipe pile 30, and after insertion, the 3rd connection member 70 is slid to the outer peripheral surface of the side part 54 of the 2nd connection member 50. It is preferable to employ an attachment method.

  Next, as shown in FIG. 13 (B), the first steel pipe pile 20 and the second steel pipe pile 30 are rotated clockwise by the rotation drive device 91, and the first steel pipe pile is driven by the propulsive force of the rotary blades 22. 20 and the second steel pipe pile 30 are penetrated into the ground. And the 2nd steel pipe pile 30 is embed | buried until the height from the ground surface of the 1st connection member 40 becomes predetermined | prescribed height. In addition, the clockwise rotational force (torque) transmitted to the second steel pipe pile 30 by the rotation driving device 91 is first via the second connection member 50, the key member 60, and the first connection member 40. The steel pipe pile 20 is transmitted. And this procedure is repeated until the steel pipe pile of predetermined length reaches a stop layer.

  In addition, when removing the 1st steel pipe pile 20 and the 2nd steel pipe pile 30, by rotating the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 counterclockwise with the rotation drive device 91, Pull out these steel pipe piles. Similarly to the clockwise rotational force (torque), the second connecting member 50 and the key member 60 also counterclockwise rotational force (torque) transmitted to the second steel pipe pile 30 by the rotational drive device 91. The first steel pipe pile 20 is transmitted through the first connecting member 40.

1-3. Load Transmission and Resistance Subsequently, load transmission acting on the joint 10 and resistance to the load acting on the joint 10 will be described.

  First, in the joint 10 of this embodiment, when the steel pipe pile main body which consists of the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 penetrates in the ground, the compression force which acts on the 2nd steel pipe pile 30 and clockwise rotation Rotational force (torque), tensile force acting on the second steel pipe pile 30 when the steel pipe pile body is pulled out from the ground, counterclockwise rotational force (torque), horizontal force acting on the second steel pipe pile 30 Such a load is transmitted to the first steel pipe pile 20 via the second connection member 50, the key member 60, and the first connection member 40. Specifically, these loads are transmitted in the order of the second steel pipe pile 30 → the second connection member 50 → the key member 60 → the first connection member 40 → the first steel pipe pile 20.

  And in the joint 10 of this embodiment, the key member 60 which supplements the cross-sectional defect | deletion (key fitting recessed part 41) of the 1st connection member 40 and the cross-sectional defect | deletion (key fitting hole 53) of the 2nd connection member 50, Because it is formed using high-tensile members with small deformation against external forces such as carbon steel for machine structures and alloy steels for machine structures, it has sufficient strength against loads such as compressive force, tensile force and torque. ing. Therefore, these loads can be transmitted sufficiently.

  Moreover, in the joint 10 of this embodiment, while making the member thickness of the 1st connection member 40 thicker than the member thickness of the 1st steel pipe pile 20, and the member thickness of the 2nd steel pipe pile 30, it is the 1st connection member. Since it is set as the double pipe structure which fixes the 1st connection member 40 and the 2nd connection member 50 in the state where 40 was inserted in the 2nd connection member 50, the 1st steel pipe pile 20 and the 2nd steel pipe It has sufficient bending strength and shear strength with respect to the steel pipe pile body made of the pile 30.

  Since the joint 10 of the present embodiment is configured as described above, the load acting on the second steel pipe pile 30 can be sufficiently transmitted to the first steel pipe pile 20, and the shearing force and the bending moment can be transmitted. It has been confirmed by FEM analysis that it has sufficient strength against loads such as torque.

2. 2nd Embodiment Although 1st Embodiment demonstrated the structure of the joint which connects the steel pipe pile of the same diameter, 2nd Embodiment demonstrates the structure of the joint which connects the steel pipe pile of a different diameter. The detailed description of the configuration common to the first embodiment described above will be omitted, and the description will focus on the main differences.

2-1. FIG. 14 shows a first steel pipe pile 120 and a second steel pipe pile 30 each having a smaller diameter than the second steel pipe pile 30 by the joint 100 of the present embodiment. It is a longitudinal cross-sectional view which shows the state which connected. However, in FIG. 14, illustration of the lower end of the first steel pipe pile 120 and the upper end of the second steel pipe pile 30 is omitted.

  In addition, the joint 100 of this embodiment is a steel joint, and as shown in FIG. 14, the 1st connection member 140, the 2nd connection member 50, the key member 60, and the 3rd connection member. 70 and the bolt 80, but the configuration of the members other than the first connection member 140 is the same as that of the first embodiment, and thus detailed description thereof is omitted. The configuration will be mainly described.

  As shown in FIG. 14, the first connecting member 140 is formed in a cylindrical shape, and the upper end portion 145 and the lower end portion 146 have a step on the inner surface. More specifically, the outer diameter of the upper end 145 is equal to the outer diameter of the lower end 146, and the inner diameter of the upper end 145 is smaller than the inner diameter of the lower end 146. However, since the size of the inner diameter of the lower end portion 146 can be set as appropriate according to the outer shape of the first steel pipe pile 120, it is not necessarily required to be smaller than the inner diameter of the upper end portion 145.

  In addition, key fitting recesses 141 are formed at predetermined positions in two opposite directions perpendicular to the radial direction of the first connection member 140 on the outer peripheral surface of the side surface portion of the upper end portion 145 of the first connection member 140. In addition, a screw hole 142 penetrating toward the inner peripheral surface of the side surface portion is formed at the bottom of the key fitting recess 141.

  Moreover, the lower end part 146 of the first connecting member 140 is fixed to the upper end side of the first steel pipe pile 120 by welding at the welded part 148. In addition, welding with the 1st connection member 140 and the 1st steel pipe pile 120 is performed beforehand in the factory etc., and the 1st connection member 140 and the 1st steel pipe pile 120 are welded in the construction site. It is carried in the state that was done.

  In the state where the first connecting member 140 is inserted into the second connecting member 50, the outer diameter of the first connecting member 140 and the inner diameter of the second connecting member 50 are inscribed, and the first The inner diameter of the connection member 140 and the outer diameter of the first steel pipe pile 120 are inscribed. That is, the lower end portion 146 of the first connection member 140 fills a gap generated between the second connection member 50 and the first steel pipe pile 120.

  Thus, in the joint 100 of this embodiment, even if the first steel pipe pile 120 has a small diameter, the lower end portion 146 of the first connection member 140 can absorb the difference, and thus the second steel pipe. The 1st steel pipe pile 120 and the 2nd steel pipe pile 30 smaller in diameter than the pile 30 can be connected, and there can exist an effect similar to the content demonstrated in 1st Embodiment.

2-2. FIG. 15 is a perspective view showing the structure of a joint that connects the second steel pipe pile 230 having a small diameter. FIG. It is a longitudinal cross-sectional view which shows the state which connected. However, in FIG. 15, illustration of the lower end of the 1st steel pipe pile 20 and the upper end of the 2nd steel pipe pile 230 is abbreviate | omitted.

  Note that the joint 200 of the present embodiment is a steel joint, and as shown in FIG. 15, the first connection member 40, the second connection member 250, the key member 60, and the third connection member. 70 and the bolt 80, but the configuration of the members other than the second connection member 250 is the same as that of the first embodiment, and thus detailed description thereof is omitted. The configuration will be mainly described.

  As shown in FIG. 15, the second connection member 250 is formed in a cylindrical shape, and the upper end portion 256 and the lower end portion 257 have a step on the inner surface. More specifically, the outer diameter of the upper end portion 256 and the outer diameter of the lower end portion 257 are equal, and the inner diameter of the upper end portion 256 is smaller than the inner diameter of the lower end portion 257. However, the size of the inner diameter of the upper end portion 256 can be appropriately set according to the outer shape of the second steel pipe pile 230.

  As shown in FIG. 15, the lower end portion 257 of the second connection member 250 is formed in a cylindrical shape whose diameter is slightly larger than that of the first steel pipe pile 20 or the first connection member 40. Specifically, the inner diameter of the lower end portion 257 of the second connection member 250 is formed so that the outer diameter of the first steel pipe pile 20 and the outer diameter of the first connection member 40 are inscribed.

  Further, the side surface portion of the lower end portion 257 of the second connection member 250 has predetermined positions facing each other in two directions perpendicular to the radial direction of the second connection member 250 and corresponds to the key fitting recess 41. A key fitting hole 253 is formed at each position.

  The opening 251 at the lower end 257 of the second connection member 250 has a guide portion 255 that guides insertion of the upper end of the first connection member 40. The outer diameter of the guide portion 255 is equal to the outer diameter of the lower end portion 257 of the second connection member 250, but the inner diameter of the guide portion 255 is that of the lower end portion 257 of the second connection member 250 toward the lower end. It is formed so as to be gradually larger than the inner diameter (tapered).

  The upper end portion 256 of the second connection member 250 is a second steel pipe pile at the welded portion 259 in a state where the lower end of the second steel pipe pile 230 is inserted from the opening 252 at the upper end of the second connection member 250. It is fixed to the lower end side of 230 by welding. Specifically, as described in the first embodiment, the distance from the upper end of the first connection member 40 to the key fitting recess 41 formed in the first connection member 40, and the second steel pipe pile 230 The upper end portion 256 of the second connecting member 250 is fixed to the second steel pipe pile 230 by welding at a position where the distance from the lower end of the second connecting member 250 to the key fitting hole 253 formed in the second connecting member 250 becomes equal. . In addition, welding with the 2nd connection member 250 and the 2nd steel pipe pile 230 is performed beforehand in the factory etc., and the 2nd connection member 250 and the 2nd steel pipe pile 230 are welded in the construction site. It is carried in the state that was done.

  That is, the inner diameter of the upper end portion 256 of the second connection member 250 is inscribed with the outer diameter of the second steel pipe pile 230, and the upper end portion 256 of the second connection member 250 is in contact with the second connection member 250. A gap generated between the lower end portion 257 and the second steel pipe pile 230 will be filled.

  Thus, in the joint 200 of the present embodiment, even if the second steel pipe pile 230 has a small diameter, the upper end portion 256 of the second connection member 250 can absorb the difference, and thus the first steel pipe. The pile 20 and the 2nd steel pipe pile 230 smaller in diameter than the 1st steel pipe pile 20 can be connected, and there can exist an effect similar to the content demonstrated in 1st Embodiment.

3. Modifications The present invention is not limited to the above-described embodiment, and various modifications can be made. It should be noted that the above-described embodiment and various configurations described later as modified examples can be appropriately combined or replaced as a configuration for realizing the present invention.

  In addition, the configuration described in the above embodiment is merely an example, and even when an equivalent technique that achieves the same effect as the configuration of the above embodiment is employed, it can be included in the scope of the present invention.

  FIG. 16 is a longitudinal sectional view showing a state in which the first steel pipe pile 20 and the second steel pipe pile 30 are connected by the joint 300 according to the modified embodiment. However, in FIG. 16, illustration of the lower end of the first steel pipe pile 20 and the upper end of the second steel pipe pile 30 is omitted.

  For example, in 1st Embodiment mentioned above, the 1st connection member 40 fixed to the upper end of the 1st steel pipe pile 20, and the 2nd connection member 50 fixed to the lower end of the 2nd steel pipe pile 30, Although the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 were connected by fixing using the key member 60 grade | etc., Like the coupling 300 shown in FIG. By fixing the second connecting member 50 fixed to the upper end and the first connecting member 40 fixed to the lower end of the second steel pipe pile 30 using the key member 60 or the like, the first steel pipe The pile 20 and the second steel pipe pile 30 may be connected. That is, the joint 300 according to the modified embodiment is obtained by inverting the joint 10 according to the first embodiment upside down, and can be used in this way.

  FIG. 17 is a perspective view schematically showing a state in which the first structural member 420 and the second structural member 430 are connected by the joint 400 according to the modified embodiment. However, in FIG. 17, illustration of the lower end of the first structural member 420 and the upper end of the second structural member 430 is omitted.

  For example, in 1st Embodiment mentioned above, in order to connect the cylindrical 1st steel pipe pile 20 and the 2nd steel pipe pile 3, the coupling 10 formed in the cylindrical shape was used, but as shown in FIG. In addition, when square steel pipes are used as the first structural member 420 and the second structural member 430, the first connecting member 440 (not shown), the second connecting member 450, and the third connecting member 470 are used. It is possible to use a joint 400 according to a modified embodiment in which is formed in a rectangular tube shape.

  As a concrete example using such a square steel pipe, there are structural members such as pillars and beams of structures, and even a structural member having a different size adopts a joint structure as in the second embodiment. Can be connected.

  FIG. 18 is a longitudinal sectional view showing a state in which the first steel pipe pile 20 and the second steel pipe pile 30 are connected by the joint 500 of the modified embodiment. However, in FIG. 18, illustration of the lower end of the first steel pipe pile 20 and the upper end of the second steel pipe pile 30 is omitted.

  For example, in the first embodiment described above, a configuration in which the third connection member 70 is attached to the outer peripheral surface of the side surface portion 54 of the second connection member 50 is employed. However, as in the joint 500 illustrated in FIG. If the head 81 is positioned inside the bolt through-hole 561 formed in the key member 560, the bolt 81 is fixed to the screw hole 42 formed in the bottom of the key fitting recess 41. When the structure member such as the pile is buried in the ground without adopting the configuration in which the third connection member 70 is attached to the outer peripheral surface of the side surface portion 54 of the second connection member 50 as in the first embodiment. In addition, it is possible to prevent the occurrence of a situation where a stone hits the head of the bolt and the bolt loosens.

  FIG. 19 is a longitudinal sectional view showing a state in which the first steel pipe pile 20 and the second steel pipe pile 30 are connected by the joint 600 of the modified embodiment. However, in FIG. 19, illustration of the lower end of the 1st steel pipe pile 20 and the upper end of the 2nd steel pipe pile 30 is abbreviate | omitted.

  For example, in the first embodiment described above, the first connecting member 40 has been described as an example in which the first connecting member 40 is formed in a cylindrical shape. However, like the joint 600 shown in FIG. 19, the first connecting member 640 is a cylinder. You may make it form in a shape. If it does in this way, since the screw hole 642 formed in the bottom part of the key fitting recessed part 641 will not penetrate, the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 which were connected by the joint 600 are embed | buried in the ground. In this case, inflow of groundwater from the outside of the joint 600 to the inside of the joint 600 can be prevented, and corrosion of the inner surfaces of the first steel pipe pile 20, the second steel pipe pile 30, and the joint 600 can be prevented. In addition, the inflow of groundwater from the lower end of the 1st steel pipe pile 20 can also be prevented by providing the obstruction board at the lower end (front end) of the first steel pipe pile 20.

  Further, for example, as in the first embodiment described above, the screw hole 42 formed in the bottom of the key fitting recess 41 is made of silicon even when the first connection member 40 is formed in a cylindrical shape. Or by attaching an O-ring to the key fitting portion 65 and fitting the key member 60, it is possible to prevent inflow of groundwater from the outside of the joint 10 to the inside of the joint 10. Corrosion of the inner surface of the steel pipe pile 20, the second steel pipe pile 30, and the joint 10 can be prevented.

  Further, for example, in the first embodiment described above, the first connecting member 40 and the first steel pipe pile 20 are fixed by welding. However, the first connecting member 40 and the first steel pipe pile 20 are integrated. You may make it form. As a method of integrally forming the first connecting member 40 and the first steel pipe pile 20, there are a method of cutting a thick steel pipe or a solid steel pipe or precision casting with a mold.

  If it does in this way, since the welding distortion at the time of carrying out the welding joint of the 1st connection member 40 to the 1st steel pipe pile 20 can be eliminated, insertion of the 2nd connection member 50 to the 1st connection member 40 is possible. Work becomes easy and construction time can be shortened.

  For example, in 1st Embodiment mentioned above, although the member thickness (t1) of the 1st steel pipe pile 20 and the member thickness (t2) of the 2nd steel pipe pile 30 were made into the same member thickness (t1 = t2). The member thickness (t1) of the first steel pipe pile 20 and the member thickness (t2) of the second steel pipe pile 30 may be different member thicknesses.

  Further, the number of the key fitting recesses 41 formed in the first connecting member 40 and the key fitting holes 53 formed in the second connecting member 50 is the same as that of the first connecting member 40 and the second connecting member 50. The thickness can be set as appropriate according to the thickness and size of the member.

The perspective view which shows typically the state which connected the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 with the coupling 10. FIG. Sectional drawing of the II-II cross section of FIG. Sectional drawing of the III-III cross section of FIG. The perspective view which shows typically the structure of the 1st connection member 40 and the 2nd connection member 50. FIG. Sectional drawing of the VV cross section of FIG. The perspective view which shows typically the connection structure of the 1st connection member 40 and the 2nd connection member 50, and the structure of the key member 60. FIG. Sectional drawing of the VII-VII cross section of FIG. The perspective view which shows typically the connection structure of the 1st connection member 40, the 2nd connection member 50, and the key member 60, and the structure of the 3rd connection member 70. FIG. Sectional drawing of the IX-IX cross section of FIG. The perspective view which shows typically the connection structure of the 1st connection member 40, the 2nd connection member 50, the key member 60, and the 3rd connection member 70, and the structure of the volt | bolt 80. FIG. Sectional drawing of the XI-XI cross section of FIG. Explanatory drawing of the embedding technique of the 1st steel pipe pile 20 and the 3rd steel pipe pile 30. FIG. Explanatory drawing of the embedding technique of the 1st steel pipe pile 20 and the 3rd steel pipe pile 30. FIG. The longitudinal cross-sectional view which shows the state which connected the 1st steel pipe pile 120 and the 2nd steel pipe pile 30 with a diameter smaller than the 2nd steel pipe pile 30 with the coupling 100. FIG. The longitudinal cross-sectional view which shows the state which connected the 1st steel pipe pile 20 and the 2nd steel pipe pile 230 smaller in diameter than the 1st steel pipe pile 20 with the coupling 200. FIG. The longitudinal cross-sectional view which shows the state which connected the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 with the coupling 300. FIG. The perspective view which shows typically the state which connected the 1st steel pipe pile 420 and the 2nd steel pipe pile 430 with the coupling 400. FIG. The longitudinal cross-sectional view which shows the state which connected the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 with the coupling 500. FIG. The longitudinal cross-sectional view which shows the state which connected the 1st steel pipe pile 20 and the 2nd steel pipe pile 30 with the coupling 600. FIG.

Explanation of symbols

10, 100, 200, 300, 400, 500, 600 joints,
20, 120, 420 1st steel pipe pile,
21 cutting blade,
22 Spiral wing,
30, 230, 430 second steel pipe pile,
40, 140, 640 first connecting member,
41, 141, 641 key fitting recess,
42, 142, 642 screw holes,
43 Sides,
145 upper end,
146 lower end,
48, 148, 648 welds,
50, 250, 450 second connecting member,
51-52, 251-252 opening,
53, 253 Key fitting hole,
54 side part,
55, 255 guide part,
256 upper end,
257 lower end,
59, 259 welds,
60, 560 key member,
61, 561 Bolt through hole (second bolt through hole),
62, 562 bolt engaging portion,
65, 565 key fitting part,
70, 470 third connecting member,
71 first bolt through hole,
72 side part,
80, 480 volts,
81 bolt head,
90 pile driver,
91 rotational drive device,
92 Antistatic device

Claims (2)

A joint structure for connecting the first structural member and the second structural member,
A first connecting member having one end fixed to one end of the first structural member;
A cylindrical second connection member, one end of which is fixed to one end side of the second structural member, and the first connection member is inserted from the opening of the other end;
A key fitting recess formed on the outer peripheral surface of the side surface of the first connecting member;
A side portion of the second connecting member, a key fitting hole formed at a position corresponding to the key fitting recess;
A key comprising the key fitting recess and the key fitting hole in a state where the first connecting member is inserted into the second connecting member and the key fitting recess matches the key fitting hole. A key member for fixing the first connection member and the second connection member by being fitted into the fitting portion;
The second connection member has one end fixed to one end side of the second structural member in a state where one end of the second structural member is inserted from an opening at one end.
The first connecting member is inserted into the second connecting member until the other end contacts one end of the second structural member,
In a state where the other end of the first connection member and one end of the second structural member are in contact with each other, the positions of the key fitting recess and the key fitting hole coincide with each other in the axial direction. Fitting structure. Oite to claim 1,
A third connecting member attached to the outer peripheral surface of the side surface of the second connecting member;
The key member is inserted through the second bolt through hole formed in the key member in a state where the head portion of the bolt is positioned inside the first bolt through hole formed in the third connecting member. , Bolted to the screw hole formed in the bottom of the key fitting recess,
The third connecting member is attached to the outer peripheral surface of the side surface of the second connecting member by locking the head of the bolt inside the first bolt through hole. Construction.

Images