JP2009097324A - Pipe joint structure for foundation pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply perform a connection work of tubular bodies without damaging. <P>SOLUTION: The plug of one tubular body 1b is inserted into the socket of the other tubular body 1a to form a through-hole 2 on the side surfaces of both tubular bodies 1a, 1b. A bolt 5, wherein the outer circumferential tapered surface 3 is formed on the outer circumference thereof and a threaded part 4 is formed at both ends thereof, is inserted into the through-hole 2. After the insertion of the bolt 5, a spacer 7, wherein the inner circumferential tapered surface 6 is formed on the inner circumference thereof, is fitted to both ends thereof in the direction, making both tapered surfaces 3, 6 abutting on each other. Furthermore, a nut 8 is screwed into the threaded parts 4, 4 at both ends of the bolt 5 to cause the bolt 5 and both tapered surfaces 3, 6 of the spacer 7, and the inner surface of the through-hole 2 and the outer circumferential surface of the space 7 to be brought into pressure contact with each other, ensuring connection of both tubular bodies 1a, 1b. The diameter of the bolt 5 is smaller than the inner diameter of the through-hole 2, and the insertion of the bolt 5 into the through-hole can be smoothly executed without damaging the tubular bodies, with no risk of damaging the tubular bodies 1a, 1b caused by a wrong impact. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint structure for a foundation pile made of a tubular body used for building construction.

  Tubular bodies such as ductile cast iron pipes may be used as foundation piles used for building construction. As shown in FIG. 6, a cutting portion 14 for digging the ground is formed at the tip of the tubular body 1, and a joint portion for connecting an extending tubular body to the rear end of the tubular body. 17 is formed.

  The tubular body 1 (1a) is driven by pushing the tubular body 1a against the ground with the cutting portion 16 down, and rotating the tubular body 1a around the axis to cut the ground. When the tubular body 1a is buried in the ground to some extent, the extending tubular body 1b is connected to the rear end of the driving tubular body 1a, and the connected tubular bodies 1a and 1b are rotated to further cut the ground. This operation is repeated until the distal tubular body 1a (the cutting portion 16) reaches the support ground 18.

  In order to proceed with this operation promptly, it is necessary to reliably transmit the rotational torque applied to the connected tubular body 1b to the lowermost tubular body 1a to perform the above-mentioned cutting smoothly. However, if the joint portion 19 is rattled, the transmission is not reliably performed, and not only a smooth cutting operation cannot be performed, but the tubular bodies 1a and 1b may not be driven vertically to the ground. There is also.

  Further, even after the building 17 is constructed, an earthquake occurs (see FIG. 5A) where the building 17 is to be stably supported by the tubular body 1a driven up to the support ground 18 (see FIG. 5A). There is also a problem that when the joint portion 19 is bent when the horizontal white arrow in the inside is bent), the building 17 cannot be stably supported (see FIG. 5B).

  Then, in order to perform the connection of tubular body 1a, 1b reliably, the pipe joint structure shown, for example in FIG. 7 is proposed (refer patent document 1).

  In this pipe joint structure, the insertion port of the other tubular body 1b is inserted into the receiving port of the one tubular body 1a, and the tubular bodies 1a, 1b are located at different positions in the axial direction of the connected tubular bodies 1a, 1b. The through-hole 2 penetrating over the tube diameter is formed so as to cross the cross in the axial section.

  Further, threaded portions 4 are formed at both ends of the through hole 2 in the axial direction, and bolts 5 having a shaft diameter slightly larger than the inner diameter of the through hole 2 are forcibly inserted. A taper surface is formed between the shaft portion at the center of the bolt 5 and the screw portion 4 (see reference numeral 16c in FIG. 2 of Patent Document 1), and the bolt 5 is inserted into the through hole 2 by this taper surface. Easy to do. Since the tapered surface is formed with a diameter smaller than that of the through hole 2, the inner surface of the through hole and the tapered surface do not come into contact with each other.

  The bolt 5 forcibly inserted as described above makes contact (pressure contact) between the outer peripheral surface and the inner surface of the through-hole 2 with a strong pressure, and the tubular bodies 1a and 1b are firmly fixed by this pressure contact. Fixed to. Washers 20 and nuts 8 are attached to both ends of the bolt 5 to prevent the axial displacement of the bolt 5.

JP 2003-64668 A

The bolt is inserted into the through hole by hitting the bolt with a hammer or the like.
However, since this insertion is performed by forcibly inserting a bolt having a shaft diameter slightly larger than the inner diameter of the through hole, it is necessary to repeatedly hit the bolt. It takes a lot of time to repeatedly hit the bolt, and the working efficiency is low.
Further, if the number of hits is increased, members other than the bolt may be hit due to a hit error, which may cause distortion or the like in the connecting portion of the tubular body.

  Therefore, an object of the present invention is to enable the connecting operation of the tubular bodies to be performed easily and without damaging the tubular bodies.

  In order to solve the above-described problems, the present invention provides a tapered surface on each side of a penetrating member and a through-hole into which the penetrating member is inserted so that both tapered surfaces are slidably brought into contact with the penetrating member. The taper surface was relatively moved in the axial direction by a screwed nut to press the penetrating member and the through hole.

  By pressing the tapered surfaces together, the tubular bodies having the through holes are restrained by the penetrating member, so that the tubular bodies are firmly fixed.

  Moreover, by designing the outer diameter of the member having the tapered surface smaller than the inner diameter of the through hole, the member can be easily inserted into the through hole. There is no need to strike the member.

  As a configuration of the present invention, the insertion opening of the other tubular body is inserted into the receiving opening of one tubular body, and through holes that pass through both the tubular bodies coaxially are formed on both side surfaces sandwiching the tube axis of the both tubular bodies. In the foundation pile pipe joint structure in which a single penetrating member is inserted into both the through holes and the tubular members are connected to each other by the penetrating member, shafts of the penetrating member are disposed at both axial ends of the penetrating member. Each of the spacers is formed with a cylindrical spacer having an inner peripheral tapered surface that abuts on the outer peripheral tapered surface at both ends in the axial direction of the penetrating member. Each of the spacers is pushed inward in the axial direction by screwing a nut into the penetrating member from the outside in the axial direction, and the outer peripheral surface of each spacer and the inner surface of the through hole by pushing in, A fine the peripheral tapered surface and the inner circumferential tapered surface is pressed against each can to connect with each other the both tubular bodies.

  When the spacer is pushed inward in the axial direction by the nut, the outer peripheral tapered surface and the inner peripheral tapered surface are in pressure contact with each other while sliding, and the spacer expands the diameter. Due to this diameter expansion, the outer peripheral surface of the spacer and the inner surface of the through hole are in pressure contact.

  When the outer peripheral surface of the spacer and the inner surface of the through hole are pressed against each other, if there is a misalignment between the axial center of the spacer and the axial centers of the through holes formed in the two tubular bodies, the axial centers thereof The spacers guide the through-holes (tubular bodies) so that they all coincide. Since the axial misalignment is corrected by this guidance, rattling when both tubular bodies are connected is suppressed.

The nut screwed into the bolt generates an external force that contacts only the spacer and pushes the spacer into the through hole. At this time, if the nut abuts not only on the spacer but also on the outer peripheral surface of the tubular body, the nut cannot be screwed in, so that the abutting of the tapered surfaces may be insufficient.
In order to avoid this, when the nut is screwed in, the axial length of the spacer is increased so that the nut does not contact the outer peripheral surface, or the maximum diameter of the nut is made larger than the outer diameter of the spacer. It is preferable to make it smaller.

  In addition, a slit penetrating from the outer peripheral surface to the inner peripheral tapered surface can be formed in the spacer provided in contact with the inner surface of the through hole.

By forming slits in this way, when the spacers and the tapered surfaces of the penetrating members are in pressure contact with each other, the slit width of the slits is increased and the outer peripheral diameter of the spacers is increased. The pressure contact with the inner surface of the through hole is smoothly performed. Therefore, the connection of the two tubular bodies is further ensured.
In order to make it easier to increase the slit width, it is preferable to form the slit over the entire length of the spacer in the axial direction.

  As another configuration of the present invention, in the pipe joint structure for a foundation pile, a cylindrical spacer is fitted to both end portions in the axial direction of the penetrating member and a bush is fitted in the through hole, and the spacer is pivoted on an outer periphery thereof. The bush has an outer peripheral tapered surface that gradually increases in thickness toward the outer side, and the bush has an inner peripheral tapered surface that gradually decreases toward the inner side in the axial direction, from the outer side in the axial direction of each spacer. By screwing nuts into the penetrating members, the spacers are pushed inward in the axial direction, and by pushing, the outer peripheral surfaces of the bushes, the inner surfaces of the through holes, the outer peripheral tapered surfaces, the inner peripheral tapered surfaces, and the through holes The tubular bodies can be connected to each other by bringing the outer peripheral surface of the member into contact with the inner peripheral surface of the spacer.

  When the spacer is pushed inward in the axial direction by the nut, the outer peripheral taper surface and the inner peripheral taper surface are pressed against each other while sliding, and the bush expands the diameter by this press contact. Due to the diameter expansion, the outer peripheral surface of the bush and the inner surface of the through hole are in pressure contact.

  When the outer peripheral surface of the bush and the inner surface of the through hole are pressed against each other, if there is a misalignment between the axial center of the bush and both axial centers of the through holes formed in the tubular bodies, the axial centers thereof The bushes guide the through hole (tubular body) so that they all coincide. Since the axial misalignment is corrected by this guidance, rattling when both tubular bodies are connected is suppressed.

The nut screwed into the bolt generates an external force that contacts only the spacer and pushes the spacer into the through hole. At this time, if the nut comes into contact with not only the spacer but also the bush, the nut cannot be screwed in, and there is a possibility that the contact between the tapered surfaces becomes insufficient.
In order to avoid this, the spacer is provided so as to protrude beyond the bush so that the nut does not contact the outer peripheral surface of the bush when the nut is screwed in, or the maximum diameter of the nut is set to the outer diameter of the spacer. It is preferable to make it smaller.

  In the other configuration described above, a cylindrical spacer is fitted to both ends of the penetrating member in the axial direction and a bush is fitted into the through hole, and the spacer gradually increases in thickness toward the outer side in the axial direction. The bush has an outer peripheral taper surface and a screw hole on the inner periphery thereof, and the bush has an inner peripheral taper surface that gradually decreases toward the inner side in the axial direction, and the spacer is screwed into the penetrating member. The bush is pushed inward in the axial direction, and by pushing, the outer peripheral surface of the bush and the inner surface of the through hole, the outer peripheral tapered surface and the inner peripheral tapered surface, and the outer peripheral surface of the penetrating member and the inner peripheral surface of the spacer The above tubular bodies can also be connected to each other by pressure-contacting each other.

  By thus screwing the spacer itself without using a nut, the head of the spacer gradually sinks into the tube wall of the tubular body and does not protrude from the tube wall. For this reason, when the tubular body is driven into the ground, it is possible to prevent the ground around the tubular body from being loosened by the spacer protruding from the tube wall, thereby preventing the support state of the driven tubular body from becoming unstable.

  A groove for screwing may be formed at the outer end of the spacer in the axial direction. The groove is, for example, a single letter that passes through the center of the spacer in the axial direction. A tool is fitted into the single letter groove, and the tool is rotated to rotate the spacer around the axis. The shape of the groove is not limited to a single character, and various known shapes such as a cross shape and a hexagon can be adopted.

  Further, a slit penetrating from the outer peripheral surface to the inner peripheral tapered surface can be formed in the bush provided in contact with the inner surface of the through hole.

By forming the slit in this way, when the tapered surfaces of the bush and the spacer are pressed against each other, the slit width of the slit is increased and the outer diameter of the bush is increased. The pressure contact with the inner surface of the through hole is smoothly performed. Therefore, the connection of the two tubular bodies is further ensured.
In order to make it easier to increase the slit width, it is preferable to form the slit over the entire axial length of the bush.

  As another configuration of the present invention, in the pipe joint structure for a foundation pile, an outer peripheral tapered surface that gradually becomes thicker toward an axially outer side of the penetrating member is formed at one axial end portion of the penetrating member, A cylindrical spacer having an outer peripheral tapered surface that gradually increases in thickness toward the outer side in the axial direction of the penetrating member can be screwed to the other axial end, and the outer peripheral tapered surface of the one axial end is formed in the through hole. The cylindrical spacer is pushed into the inner side in the axial direction by screwing the cylindrical spacer into the penetrating member and presses the outer peripheral surface of the cylindrical spacer and the inner surface of the through hole. The two tubular bodies can be connected to each other.

When the cylindrical spacer is screwed in, the outer peripheral tapered surface formed on the penetrating member and the cylindrical spacer and the inner peripheral tapered surface formed in the through hole are in pressure contact while sliding.
When there is a displacement between the axial centers of the penetrating member and the cylindrical spacer and the axial centers of the through holes formed in the tubular bodies when the outer peripheral tapered surface and the inner peripheral tapered surface are pressed against each other, The penetrating member or the like guides the penetrating hole (tubular body) so that all the axial centers thereof coincide with each other. Since the axial misalignment is corrected by this guidance, rattling when both tubular bodies are connected is suppressed.

  According to this invention, when inserting the penetrating member into the through-hole formed in the tubular body, it is not necessary to hit the penetrating member, so that the connecting operation of the tubular body can be easily performed and the tubular body can be damaged. Can be done without giving.

  A pipe joint structure for a foundation pile according to the present invention is shown in FIGS.

  In the pipe joint structure for foundation piles shown in FIG. 1, first, the insertion port of the other tubular body 1b is inserted into the receiving port of one tubular body 1a, and the both ends of the pipe diameter are placed on the side surfaces of both the tubular bodies 1a and 1b. A through hole 2 penetrating therethrough is formed at a position that intersects the cross in the axial section of both tubular bodies 1a and 1b (see FIG. 2A).

  Next, the outer peripheral taper surface 3 which becomes gradually thinner toward both ends in the axial direction and the bolt 5 having the threaded portion 4 are inserted into the through hole 2 (see FIG. 5B). Since the diameter (thickest portion) of the bolt 5 is designed to be smaller than the inner diameter of the through hole 2, this insertion can be performed smoothly.

  When the bolt 5 is inserted into the through hole 2, a spacer 7 having an inner circumferential tapered surface 6 is fitted to both ends thereof in such a direction that the inner circumferential tapered surface 6 comes into contact with the outer circumferential tapered surface 3 (FIG. 3 (c)). )reference).

  Further, nuts 8 are screwed into the screw portions 4 at both ends of the bolt 5 (see FIG. 4D). By this screwing, the spacer 7 is pushed inward in the axial direction, and by pushing, the outer peripheral surface of the spacer 7 and the inner surface of the through-hole 2, and the outer peripheral tapered surface 3 and the inner peripheral tapered surface 6 are respectively pressed into contact with each other. 1b are connected.

  As shown in FIG. 2, the spacer 7 is formed with a slit 9 penetrating from the outer peripheral surface to the inner peripheral tapered surface 6 over the entire length in the axial direction. When the both tapered surfaces 3 and 6 come into strong contact with each other by screwing in the nut 8, the slit 9 is widened and the slit 9 is easily expanded in diameter. Therefore, the degree of press contact between the outer peripheral surface of the spacer 7 and the inner surface of the through hole 2 is increased, and the connection between the tubular bodies 1a and 1b is further ensured.

  Further, in the pipe joint structure for foundation piles shown in FIG. 3, a through hole 2 is formed in the same manner as the structure shown in FIG. 1, and a bush 10 and a cylindrical spacer 7 are fitted into the through hole 2. Bolts 5 are inserted into the bolts, and nuts 8 are screwed into both ends of the bolts 5 to connect the tubular bodies 1a and 1b (see FIGS. 1A and 1B).

  On the inner peripheral surface of the bush 10 used for the pipe joint structure for foundation piles, an inner peripheral tapered surface 11 that gradually becomes thinner toward the inner side in the axial direction is formed and on the outer side in the axial direction, the outer periphery of the bush 10 is formed. A flange 12 protruding to the radial side is formed (see FIG. 10C). The flange portion 12 prevents the bush 10 from passing through the through hole 2 and falling into the tubular body 1a.

  Instead of the flange portion 12 or when the flange portion 12 is formed, a protrusion is formed on the outer diameter surface of the bush 10, and the protrusion 10 and the inner surface of the through hole 2 are brought into strong contact with each other so that the bush 10 penetrates. It is also possible to prevent the holes 2 from falling into and out of the holes. The shape of the protrusion is not particularly limited as long as it can enhance the contact. For example, the protrusion is a protrusion provided in the circumferential direction of the outer diameter surface of the bush 10 or is scattered on the outer diameter surface. Or a protrusion.

  Further, a slit 9 that penetrates from the outer peripheral surface to the inner peripheral tapered surface 11 is formed over the entire length of the bush 10 in the axial direction (see FIG. 4D). The slit 9 is easily expanded in diameter by increasing the slit width by screwing the nut 8 into the bolt 5. Therefore, the degree of pressure contact between the outer peripheral surface of the bush 10 and the inner surface of the through hole 2 is increased, and the connection between the tubular bodies 1a and 1b is further ensured.

  Further, the outer peripheral tapered surface 3 is formed on the outer periphery of the spacer 7 so that the outer peripheral tapered surface and the inner peripheral tapered surface 11 formed on the bush 10 can be pressed against each other (see FIG. 5E). .

  Further, the pipe pile structure for a foundation pile shown in FIG. 4 forms a through hole 2 in the same manner as the structure shown in FIG. 1, and a bush 10 is fitted into the through hole 2 and a bolt 5 is attached to both the through holes 2 and 2. A spacer 7 having a screw hole 13 formed on the inner peripheral surface is screwed into both ends of the bolt 5 to connect the tubular bodies 1a and 1b (see FIGS. 1A and 1B).

  The inner peripheral surface of the bush 10 used for the pipe joint structure for foundation piles is formed with an inner peripheral tapered surface 11 that becomes gradually thinner toward the inner side in the axial direction, and the outer shape of the bush 10 is formed on the outer side in the axial direction. The flange part 12 which protrudes to the side is formed (refer to the figure (c)). The flange portion 12 prevents the bush 10 from passing through the through hole 2 and falling into the tubular body 1a.

  Instead of the flange portion 12 or when the flange portion 12 is formed, a protrusion is formed on the outer diameter surface of the bush 10, and the protrusion 10 and the inner surface of the through hole 2 are brought into strong contact with each other so that the bush 10 penetrates. It is also possible to prevent the holes 2 from falling into and out of the holes. The shape of the protrusion is not particularly limited as long as it can enhance the contact. For example, the protrusion is a protrusion provided in the circumferential direction of the outer diameter surface of the bush 10 or is scattered on the outer diameter surface. Or a protrusion.

  Further, a slit 9 that penetrates from the outer peripheral surface to the inner peripheral tapered surface 11 is formed over the entire length of the bush 10 in the axial direction (see FIG. 4D). The slit 9 is easily expanded in diameter by increasing the slit width by screwing the spacer 7 into the bolt 5. Therefore, the degree of pressure contact between the outer peripheral surface of the bush 10 and the inner surface of the through hole 2 is increased, and the connection between the tubular bodies 1a and 1b is further ensured. The screw on the surface of the bolt 5 may be formed only at the portion into which the spacer 7 is screwed as shown in FIG.

  The spacer 7 is formed with an outer peripheral tapered surface 3 on its outer periphery so that the outer peripheral tapered surface and the inner peripheral tapered surface 11 formed on the bush 10 can be pressed against each other, and a screw hole is formed on the inner periphery thereof. Thus, as described above, the bolt 5 can be screwed (see FIG. 5E). A screw groove 14 is formed on the outer end of the spacer 7 in the axial direction. By inserting a tool into the groove 14 and rotating the groove 14, the screwing operation can be easily performed.

  Moreover, compared with the case where the nut 8 is used for the connection of both the tubular bodies 1a and 1b, the protrusion from the tube wall is small (at most, the thickness of the flange portion 12 of the bush 10). For this reason, when the tubular body 1 is driven, the ground around the tubular body 1 is loosened, and it is possible to prevent the support state of the driven tubular body 1 from becoming unstable.

  As another structure of this pipe joint structure for foundation piles, as shown in FIG. 5, the inner circumference gradually narrows from the outer peripheral surface side to the inner peripheral surface side of both tubular bodies 1a, 1b on the inner surface of this through hole 2. A tapered surface 11 is formed (see FIG. 1A).

  Further, a bolt 5 having an outer peripheral tapered surface 15 abutting against the inner peripheral tapered surface 11 is inserted into the through hole 2 (see FIG. 5B), and the bolt 5 is formed at the tip of the bolt 5. The nut 8 formed with the outer peripheral taper surface 15 having the same taper angle as the outer peripheral taper surface 15 is screwed (see FIG. 5C). The outer peripheral tapered surface 15 forming portion of the bolt 5 and the nut 8 functions as the spacer 7 described above.

  By screwing the nut 8, the inner peripheral tapered surface 11 formed in the through hole 2 and the both outer peripheral tapered surfaces 15 formed on the bolt 5 and the nut 8 are pressed against each other, and the tubular bodies 1 a and 1 b are firmly connected. .

  In this embodiment, the outer peripheral tapered surface 15 is formed on the bolt 5 and the nut 8, but without forming the outer peripheral tapered surface 15 on the bolt 5 and the nut 8, as shown in FIGS. 1 to 3, The spacer 7 may be provided as a separate member from the bolt 5 and the outer peripheral tapered surface 15 may be formed on the spacer 7.

  Since the connecting operation between the tubular bodies 1a and 1b is usually performed in the field, the alignment accuracy of the through holes 2 and 2 formed in the tubular bodies 1a and 1b may not be obtained. Thus, even when the positions of the through holes 2 and 2 are slightly shifted, the tips of the bolts 5 and the nuts 8 that are tapered by forming the outer peripheral tapered surface 15 enter the through holes 2. The relative taper surface 15 is shifted little by little so that the axial centers of the through-holes 2 and 2 are aligned with each other, thereby eliminating the positional shift between the two. For this reason, it is not necessary to perform alignment of both through-holes 2 and 2 in advance in the connection work in the field, and this connection work can be performed quickly.

It is sectional drawing which shows one Embodiment of the pipe joint structure which concerns on this invention, (a) is a mode of formation of a through-hole, (b) is a mode of insertion of a bolt, (c) is a mode of insertion of a spacer (D) is a state of fixing both tubular bodies by screwing nuts. It is a spacer used for the embodiment, (a) is a sectional view, (b) is a front view It is sectional drawing which shows other embodiment of the pipe joint structure concerning this invention, Comprising: (a) is a mode that both the tubular bodies were fixed, (b) is a principal part enlarged view, (c) is sectional drawing of a bush, (D) is a front view of the bush, (e) is a cross-sectional view of the spacer, and (f) is a front view of the spacer. It is sectional drawing which shows other embodiment of the pipe joint structure concerning this invention, Comprising: (a) is a mode that both the tubular bodies were fixed, (b) is a principal part enlarged view, (c) is sectional drawing of a bush, (D) is a front view of the bush, (e) is a cross-sectional view of the spacer, and (f) is a front view of the spacer. It is sectional drawing which shows other embodiment of the pipe joint structure which concerns on this invention, Comprising: (a) is formation of a through-hole, (b) is insertion of a volt | bolt, (c) is screwing in a nut, and both tubular bodies are inserted. Fixed state It is a figure which shows the mode of the support of the building by the connection tubular body at the time of earthquake occurrence, Comprising: (a) is the case of the pipe joint structure which concerns on this invention, (b) is the case of the pipe joint structure which concerns on a prior art Sectional drawing which shows the pipe joint structure which concerns on a prior art

Explanation of symbols

1 (1a, 1b) Tubular body 2 Through holes 3, 15 Outer tapered surface 6, 11 Inner circumferential tapered surface 4 Threaded portion 5 Bolt 7 Spacer 8 Nut 9 Slit 10 Bush 12 Threaded portion 13 Screw hole 14 Groove portion

Claims (7)

The insertion port of the other tubular body (1b) is inserted into the receiving port of the one tubular body (1a), and the through holes (2) passing through both the tubular bodies (1a, 1b) are coaxially connected to the both tubular bodies ( 1a, 1b) is formed on both sides of the side surface of the tube axis, and a single penetrating member (5) is inserted into both the through holes (2, 2), and the two tubular bodies (1a) are inserted by the penetrating member (5). 1b) In the pipe joint structure for foundation piles connecting each other,
An outer peripheral taper surface (3) that gradually becomes thinner toward the outer side in the axial direction of the penetrating member (5) is formed at both ends in the axial direction of the penetrating member (5), and abuts on the outer peripheral tapered surface (3). Cylindrical spacers (7) having an inner circumferential tapered surface (6) are fitted to both ends of the penetrating member (5) in the axial direction, and the penetrating members (5) are connected to the penetrating member (5) from the axially outer side of the spacers (7). Each of the spacers (7) is pushed inward in the axial direction by screwing the nut (8), and the outer circumferential surface of each of the spacers (7), the inner surface of the through hole (2), and the outer circumferential tapered surface by the pushing. (3) A pipe joint structure for foundation piles, wherein the tubular bodies (1a, 1b) are connected to each other by press-contacting the inner circumferential tapered surface (6) with each other.   The pipe joint structure for foundation piles according to claim 1, wherein a slit (9) penetrating from the outer peripheral surface to the inner peripheral tapered surface (6) is formed in the spacer (7). The insertion port of the other tubular body (1b) is inserted into the receiving port of the one tubular body (1a), and the through holes (2) passing through both the tubular bodies (1a, 1b) are coaxially connected to the both tubular bodies ( 1a, 1b) is formed on both sides of the side surface of the tube axis, and a single penetrating member (5) is inserted into both the through holes (2, 2), and the two tubular bodies (1a) are inserted by the penetrating member (5). 1b) In the pipe joint structure for foundation piles connecting each other,
Cylindrical spacers (7) are fitted to both end portions of the penetrating member (5) in the axial direction, and bushes (10) are fitted into the through holes (2). The bush (10) has an inner taper surface (11) that gradually becomes thinner toward the inner side in the axial direction, Each nut (8) is screwed into the penetrating member (5) from the outside in the axial direction of each spacer (7), thereby pushing each spacer (7) inward in the axial direction. The outer peripheral surface and the inner surface of the through hole (2), the outer peripheral tapered surface (3) and the inner peripheral tapered surface (11), the outer peripheral surface of the penetrating member (5) and the inner peripheral surface of the spacer (7), respectively. The above tubular bodies are press-contacted 1a, 1b) foundation pile pipe joint structure, characterized in that connecting to each other. The insertion port of the other tubular body (1b) is inserted into the receiving port of the one tubular body (1a), and the through holes (2) passing through both the tubular bodies (1a, 1b) are coaxially connected to the both tubular bodies ( 1a, 1b) is formed on both sides of the side surface of the tube axis, and a single penetrating member (5) is inserted into both the through holes (2, 2), and the two tubular bodies (1a) are inserted by the penetrating member (5). 1b) In the pipe joint structure for foundation piles connecting each other,
Cylindrical spacers (7) are fitted to both end portions of the penetrating member (5) in the axial direction, and bushes (10) are fitted into the through holes (2). It has an outer peripheral tapered surface (3) that gradually becomes thicker as it goes toward and has a screw hole (13) in its inner periphery, and the bush (10) is gradually thinner toward the inner side in the axial direction. Each of the bushes (10) has a circumferential tapered surface (11), and the spacers (7) are screwed into the penetrating member (5) to push the spacers (7) inward in the axial direction. The outer peripheral surface and the inner surface of the through hole (2), the outer peripheral tapered surface (3) and the inner peripheral tapered surface (11), the outer peripheral surface of the penetrating member (5) and the inner peripheral surface of the spacer (7), respectively. The above tubular bodies are press-contacted 1a, 1b) foundation pile pipe joint structure, characterized in that connecting to each other.   The pipe joint structure for foundation piles according to claim 4, wherein a groove (14) for screwing is formed at the axially outer end of the spacer (7).   The pipe for foundation piles as described in any one of Claim 3 thru | or 5 which formed the slit (9) penetrated from the outer peripheral surface to an inner peripheral taper surface (11) in the said bush (10). Joint structure. The insertion port of the other tubular body (1b) is inserted into the receiving port of the one tubular body (1a), and the through holes (2) passing through both the tubular bodies (1a, 1b) are coaxially connected to the both tubular bodies ( 1a, 1b) is formed on both sides of the side surface of the tube axis, and a single penetrating member (5) is inserted into both the through holes (2, 2), and the two tubular bodies (1a) are inserted by the penetrating member (5). 1b) In the pipe joint structure for foundation piles connecting each other,
The penetrating member (5) is formed with an outer peripheral tapered surface (15) that gradually increases in thickness toward the outer side in the axial direction of the penetrating member (5) at one axial end portion, and the penetrating member (15) at the other axial end portion. 5) The cylindrical spacer (7) having an outer peripheral tapered surface (15) that gradually increases in thickness toward the outer side in the axial direction of 5) can be screwed.
The outer peripheral tapered surface (15) at one end in the axial direction is directed to the inner peripheral tapered surface (11) formed in the through hole (2), and the cylindrical spacer (7) is connected to the penetrating member (5). The cylindrical spacer (7) is pushed inward in the axial direction by being screwed into the inner surface of the cylindrical spacer (7) and the inner surface of the through-hole (2) is pressed into contact with the two tubular bodies (1a, 1b). ) Pipe joint structure for foundation piles characterized by connecting together.

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