JP2013245480A - Loosening prevention structure of steel pipe connection and loosening prevention method of steel pipe connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely prevent occurrence of loosening or rattling between connected steel pipes.SOLUTION: One steel pipe 10 includes a male connection end portion 13 having a thread in the outer circumference thereof, and the other steel pipe 20 includes a female connection end portion 23 having a thread in the inner circumference thereof and threaded with the male connection end portion 13. In a structure where the one steel pipe 10 and the other steel pipe 20 are connected by threading the connection end portions 13, 23 with each other, a bolt having an uneven shape in the distal end portion thereof is threaded into a through hole 29, which the female connection end portion 23 comprises, from an outer circumferential surface 27 of the female connection end portion 23 to an inner circumferential surface 28 to press the distal end portion against an outer circumferential surface of the male connection end portion 13, thereby constituting a loosening prevention structure of steel pipe connection.

Description

  The present invention relates to a steel pipe joint loosening prevention structure and a steel pipe joint loosening prevention method, and specifically relates to a technique for easily and reliably preventing the occurrence of loosening and rattling between joined steel pipes.

In various buildings such as high-rise apartments, office buildings, and station facilities, the use of concrete-filled steel pipe structures using steel pipe columns instead of steel reinforced concrete structures is increasing. In addition, piles having the same structure, that is, steel pipe piles, have been widely used for building foundations.
As a technique for joining such steel pipes, for example, each of the steel pipe pile ends is provided with a male side cylinder having a male thread and a female side cylinder having a female thread. In addition, there has been proposed a steel pipe pile joint (see Patent Document 1) characterized in that a cylindrical portion having an outer diameter loosely fitted to the inner diameter of the female screw is provided at the tip of the male cylinder.
In this bonded joint, the pile under construction is reversed by providing a concave groove or a concave hole on the outer periphery of the cylindrical portion and providing a mounting hole for a set bolt that fits into the concave groove or the concave hole in the female side cylinder. In such a case, measures are taken to prevent unnecessary movement from occurring in the threaded joint.

Japanese Patent Laid-Open No. 10-311028

  When adopting a structure consisting of a set bolt and its mounting hole as in the prior art, in the state where the male cylinder and the female cylinder are screwed together, the concave hole of the male cylinder and the female cylinder It is necessary that the mounting hole is in position so that the set bolt can be inserted. Therefore, it is necessary to enlarge the opening of each hole in the male side cylinder and the female side cylinder so as to cope with a slight misalignment at the time of screwing, and to provide a predetermined margin for the above misalignment. It was. Such a structure tends to cause unnecessary play between each of the holes and the set bolt inserted through the holes, thereby causing looseness and rattling of the steel pipe joint. For example, when a steel pipe after joining is constructed as a steel pipe column, rotational force may be applied to the steel pipes. In such a situation, unnecessary play between the above-mentioned holes and the set bolt causes loosening between the steel pipes. Invite yagatsu. In addition, a horizontal force acting on the steel pipes during an earthquake may cause a rotational force and similarly cause looseness and rattling.

  On the other hand, if the opening of each hole is not enlarged so that unnecessary play does not occur with the set bolt, the position of each hole when the male cylinder and the female cylinder are screwed together is increased. It is necessary to match the accuracy. In this case, it is necessary to appropriately increase the machining accuracy of the threads on the male cylinder and the female cylinder, which leads to a significant increase in cost and labor.

  Then, this invention aims at provision of the technique which prevents the generation | occurrence | production of the looseness and shakiness between the joined steel pipes simply and reliably.

  The steel pipe joint loosening prevention structure of the present invention that solves the above-mentioned problems includes one steel pipe having a male joint end having a thread on the outer periphery, and the male joint having a thread on the inner periphery. In the structure in which the other steel pipe provided with the female joint end portion screwed with the end portion is joined by screwing the joint end portions to each other, the joint end portion of the female die is joined to the female die. A through hole extending from the outer peripheral surface of the end portion to the inner peripheral surface, a bolt having a concavo-convex shape at the front end portion is screwed into the through hole, and the front end portion is pressed against the outer peripheral surface of the male joint end portion. It is characterized by.

  According to this, when the male joint end and the female joint end between the steel pipes are screwed together, the screw between the female joint end and the male joint end is not taken into consideration. If a bolt is screwed into the above-described through-hole at a position where the joint is arbitrarily performed with sufficient torque, an effective steel pipe joint loosening prevention structure can be simply configured.

  Such a structure of the present invention does not have a structure that causes the loosening of the steel pipe joint to allow the positional deviation of the predetermined hole as described above, and the bolt end is the outer periphery of the male joint end. They are pressed against the surface and bite into one another. As a result, even if a rotational force acts between the joined steel pipes after the bolts are screwed into the through-holes, the friction generated between the outer peripheral surface of the male joint end and the bolts that bite into it. The force reliably resists the above-mentioned rotational force and can effectively prevent the occurrence of looseness and rattling in steel pipe joining. Therefore, loosening or rattling occurs in steel pipe joints when a rotational force is applied to the steel pipes in a direction that cancels the joints, such as when the steel pipes after joining are constructed as steel pipe columns or when an earthquake occurs. Such concerns are resolved. Moreover, the problem that the manufacturing cost and labor of a member increase does not arise by considering the positioning accuracy at the time of screwing of a male side cylinder and a female side cylinder.

  That is, according to the present invention, it is possible to easily and reliably prevent the occurrence of looseness and rattling between the joined steel pipes.

  In the steel pipe joint loosening prevention structure according to the present invention, the concavo-convex shape at the tip of the bolt may be configured by a lattice-shaped groove or a convex portion or a combination thereof. According to this, the uneven shape that is easily generated at the tip of the bolt can reliably resist the rotational force between the steel pipes described above, and can effectively prevent the occurrence of looseness and rattling in the steel pipe joint.

  In the structure for preventing loosening of steel pipe joints according to the present invention, the concavo-convex shape at the tip portion of the bolt may be constituted by a groove or a convex portion concentric with the bolt cross section or a combination thereof. According to this, the uneven shape that is easily generated at the tip of the bolt can reliably resist the rotational force between the steel pipes described above, and can effectively prevent the occurrence of looseness and rattling in the steel pipe joint.

  Further, the method for preventing loosening of steel pipe joint according to the present invention includes one steel pipe having a male joint end having a thread on the outer periphery, and the male joint end having a thread on an inner periphery. It is a loosening prevention method of the structure which joined the other steel pipe provided with the female type joined end part to be screwed together by screwing together the joined end parts, and the said female type joined end part is provided with the female A bolt having a concavo-convex shape at the tip is screwed into a through-hole extending from the outer peripheral surface to the inner peripheral surface of the joining end of the mold, and the tip is pressed against the outer peripheral surface of the male joining end. It is characterized by.

  According to the present invention, it is possible to easily and reliably prevent the occurrence of looseness and rattling between joined steel pipes.

It is a figure which shows the procedure example 1 of the loosening prevention method of the steel pipe joining in this embodiment. It is a figure which shows Example 1 of the loosening prevention structure of the steel pipe joining in this embodiment. It is a figure which shows Example 2 of the loosening prevention structure of the steel pipe joining in this embodiment. It is a figure which shows the procedure example 2 of the loosening prevention method of the steel pipe joining in this embodiment. It is a figure which shows Example 3 of the loosening prevention structure of the steel pipe joint in this embodiment. It is a figure which shows Example 4 of the loosening prevention structure of the steel pipe joint in this embodiment. It is a figure which shows Example 5 of the loosening prevention structure of the steel pipe joint in this embodiment. It is a figure which shows Example 6 of the loosening prevention structure of the steel pipe joint in this embodiment. It is a figure which shows Example 7 of the loosening prevention structure of the steel pipe joint in this embodiment. It is a figure which shows Example 8 of the loosening prevention structure of the steel pipe joint in this embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a procedure example 1 of the method for preventing loosening of steel pipe joints in the present embodiment. The steel pipe joint loosening prevention structure 100 according to this embodiment is applied to a set of steel pipes composed of an upper steel pipe 20 and a lower steel pipe 10 which are joined together vertically. In addition, as a steel pipe in this embodiment, a steel pipe pillar or a steel pipe pile can be assumed.

  Of the pair of steel pipes 10 and 20 to be joined to each other, for example, the upper end 11 of the lower steel pipe 10 is joined with a male cylinder 13 (male joint end) having a male screw 12 on the outer periphery. Yes. On the other hand, to the lower end 21 of the upper steel pipe 20, a female cylinder 23 (female joint end) having an opening 22 for receiving the male cylinder 13 is joined. The female cylinder 23 has a female screw 24 that is screwed onto the male screw 12 of the male cylinder 13 described above on its inner peripheral surface 28. The male cylinder 13 is erected on the upper end 11 of the steel pipe 10 via the base 17. The base portion 17 is opposed to an opening of a through-hole 29 of a female cylinder 23 described later at the time of steel pipe joining, and also serves as a portion that receives and meshes with a bolt 30 that comes into contact with the through-hole 29.

  The female cylinder 23 described above includes a through-hole 29 that extends from the outer peripheral surface 27 to the inner peripheral surface 28 of the female cylinder 23. FIG. 2 is a view showing Example 1 of the structure for preventing loosening of steel pipe joints in the present embodiment. The through-hole 29 has a thread 29 </ b> A cut on the inner wall thereof, and accepts the screwing of the bolt 30 from the outside of the female cylinder 23. On the other hand, the bolt 30 to be screwed into the through hole 29 is a bolt having a concave and convex shape 32 at the tip portion 31 and a screw thread 34 for screwing into the through hole 29 on the outer peripheral surface 33. The bolt 30 is screwed into the above-described through hole 29 after the steel pipes 10 and 20 are joined. Further, as shown in FIG. 3, the bolt 30 includes a bolt hole 41 opened in the bottom portion 40 and has a structure for receiving the fitting of the tightening bolt 50. The total length of the bolt 30 is less than or equal to the total length of the through hole 29 (the same may be the same), and therefore the bottom portion 40 of the bolt 30 does not protrude from the outer peripheral surface 27 of the female cylinder 23. On the other hand, since the bolt 30 includes the above-described bolt hole 41, when the bolt 30 is screwed into the through hole 29, an appropriate tightening bolt 50 such as a hexagon bolt that matches the shape of the bolt hole 41 is used as the bolt hole. Threading can be advanced by fitting to 41 and rotating this fastening bolt 50 while applying a predetermined torque with a fastening tool such as a torque wrench.

  In such a configuration, the opening 22 of the female cylindrical body 23 of the upper steel pipe 20 is fitted into the male cylindrical body 13 of the lower steel pipe 10 (FIG. 1: when fitted). When rotating in accordance with the direction of the female screw 24 in the female cylinder 23 (FIG. 1: during rotation), the screwing of the male screw 12 of the male cylinder 13 and the female screw 24 of the female cylinder 23 proceeds, The male cylinder 13 is accommodated in the female cylinder 23 (FIG. 1: when joining is completed).

  The male cylinder 13 includes a cylindrical portion 14 having an outer diameter that loosely fits to the inner diameter of the female screw 24 of the female cylinder 23 at the tip. In this case, when the inner space 22 of the female cylinder 23 of the upper steel pipe 20 is fitted to the male cylinder 13 of the lower steel pipe column 10 as described above, the female thread 24 does not have a thread. The cylindrical portion 14 that smoothly loosely fits to the inner diameter serves as a guide for the fitting. Further, the cylindrical portion 14 is loosely fitted to the inner diameter of the female screw 24 in the female cylindrical body 23, so that the steel pipes 10 and 20 to be joined can be automatically aligned, and the male screw 12 and the female screw 24 are normally engaged. Is also achieved with high accuracy.

  Further, when the male screw 12 of the male cylinder 13 and the female screw 24 of the female cylinder 23 are screwed together and the male cylinder 13 reaches the vicinity of the inner part of the female cylinder 23, the male cylinder is reached. The cylindrical portion 14 of the body 13 abuts the end surface 15 against an inner surface seat 25 provided in the inner portion of the female cylindrical body 23, and suppresses further screwing. As a result, it is possible to avoid a situation in which the male cylinder 13 bites into the female cylinder 23 and the steel pipes 10 and 20 are damaged due to excessive screwing. The inner surface seat 25 has a structure in which the inner diameter of the female screw 24 is narrowed and protrudes from the thread of the female screw 24 in the axial direction of the steel pipe 20.

  As described above, after the male cylindrical body 13 is accommodated in the female cylindrical body 23 and the joining of the steel pipe 10 and the steel pipe 20 is completed, the above-described through hole 29 in the female cylindrical body 23 is described above. The bolt 30 is screwed. FIG. 4 is a diagram showing a procedure example 2 of the method for preventing loosening of the steel pipe joint in the present embodiment. In this case, the through-hole 29 receives the above-described screwing of the bolt 30 from the outer peripheral surface 27 of the female cylindrical body 23 (FIG. 4: when the bolt screwing starts), and as the screwing proceeds, The distal end portion 31 protrudes from the inner peripheral surface 28 of the female cylinder 23 toward the outer peripheral surface 16 of the male cylinder 13.

  The tip 31 of the bolt 30 protruding from the inner peripheral surface 28 of the female cylinder 23 abuts on the outer peripheral surface 16 of the male cylinder 13. In the present embodiment, the base portion 17 is given as an example of a portion where the distal end portion 31 of the bolt 30 contacts the outer peripheral surface 16 of the male cylindrical body 13. The bolt 30 that is screwed into the through-hole 29 with a predetermined torque responds to the above-described torque with the pressing force applied to the outer peripheral surface 16 of the male cylindrical body 13 by the tip 31 as the screwing proceeds. Will increase. The bolt 30 causes the concave-convex shape 32 of the distal end portion 31 to bite into the outer peripheral surface 16 of the male cylindrical body 13 by this pressing force, and the male cylinder is completed until the screw 30 is screwed into the through hole 29. It is integrated with the body 13 (FIG. 4: when the bolt screwing is completed).

  The torque for screwing the bolt 30 into the through-hole 29 depends on the amount of biting required between the tip 31 of the bolt 30 and the outer peripheral surface 16 of the male cylinder 13, and the tip of the bolt 30 It is set as appropriate based on the material (hardness, toughness, roughness, etc.) of the outer peripheral surface 16 of the portion 31 and the male cylindrical body 13. Further, the number of through holes 29 in the female cylinder 23 is the predicted value of the rotational force acting on the steel pipes 10 and 20 in the joined state (in the direction to cancel the joining of the steel pipes), for example, the male cylinder. It can be calculated by dividing by the frictional force exerted by one bolt 30 that bites into the outer peripheral surface 16 of the body 13. Further, by dividing the outer peripheral length of the female cylinder 23 by the number of installations calculated here, the installation interval of the through holes 29 in the female cylinder 23 can be calculated.

  In such an embodiment, even if a rotational force acting to cancel the joining acts between the steel pipes 10 and 20 in the joined state, the outer peripheral surface 16 of the male cylindrical body 13 and the tip of the bolt 30 that bites into the outer peripheral surface 16. The frictional force generated with the portion 31 can reliably resist the rotational force described above, and can effectively prevent the occurrence of looseness and rattling in the steel pipe joint. Accordingly, even when the steel pipes 10 and 20 after joining are constructed as steel pipe columns or when an earthquake occurs, the steel pipes are loosened even when a situation where a rotational force is applied to cancel the joining occurs. Concerns such as swaying are eliminated.

  In addition, when actually constructing the steel pipes 10 and 20 in a joined state as steel pipe columns or steel pipe piles, it may be necessary to interrupt the construction due to the occurrence of construction troubles and release the joining. . In that case, the screw 30 and the through-hole 29 can be unscrewed and the bolt 30 can be removed from the through-hole 29 to allow the joint ends of the steel pipe 10 and the steel pipe 20 to be unscrewed. . As a bolt 30 corresponding to such a situation, unless a bolt having a predetermined value or more is applied, a bolt having a characteristic that does not cause loosening with the through-hole 29 is employed. While it is possible to reliably prevent loosening, it is preferable that the release of the steel pipe joint can be allowed when necessary. On the other hand, when it is not assumed that screwing between the bolt 30 and the through hole 29 is eliminated, a solidifying material is applied to the screwing surface between the bolt 30 and the through hole 29 to completely screw the bolt 30 and the through hole 29. What is necessary is just to take measures to fix.

  Moreover, the uneven | corrugated shape 32 in the front-end | tip part 31 of the volt | bolt 30 becomes a structure which combined suitably the grid | lattice-like groove | channel 35 and the convex part 36 so that it may illustrate in FIGS. The uneven shape 32 illustrated in FIG. 5 is obtained by forming only the lattice-like grooves 35 on the surface 37 of the tip 31. Further, the concavo-convex shape 32 illustrated in FIG. 6 is obtained by forming only a lattice-shaped convex portion 36 on the surface 37 of the tip portion 31. In addition, the uneven shape 32 illustrated in FIG. 7 is formed by combining a lattice-shaped groove 35 and a convex portion 36 on the surface 37 of the tip portion 31.

  It should be noted that the above-described combination of the lattice-like grooves 35 and the convex portions 36, the depth of the lattice-like grooves 35 from the surface 37, the height of the convex portions 36, or the number of arrangement of the lattice-like grooves 35 and convex portions 36. The arrangement interval depends on the amount of biting required between the front end portion 31 of the bolt 30 and the outer peripheral surface 16 of the male cylindrical body 13, and the outer peripheral surface 16 of the front end portion 31 of the bolt 30 and the male cylindrical body 13. It is set as appropriate based on the material (hardness, toughness, roughness, etc.).

  Moreover, as the uneven | corrugated shape 32 in the front-end | tip part 31 of the volt | bolt 30, it can be comprised by combining suitably the groove | channel 38 and the convex part 39 which are concentric with a bolt cross section, so that it may illustrate in FIGS. The concavo-convex shape 32 illustrated in FIG. 8 is obtained by forming only a groove 38 concentric with the bolt cross section on the surface 37 of the tip 31. Further, the concavo-convex shape 32 illustrated in FIG. 9 is obtained by forming only a convex portion 39 concentric with the bolt cross section on the surface 37 of the tip portion 31. Further, the concavo-convex shape 32 illustrated in FIG. 10 is formed by combining a groove 38 concentric with the bolt cross section and a convex 39 portion 36 on the surface 37 of the tip portion 31.

  Combinations of the concentric grooves 38 and the convex portions 39 described above, the depth of the concentric grooves 38 from the surface 37 and the height of the convex portions 39, or the number and arrangement of the concentric circular grooves 38 and the convex portions 39. Similar to the above, the interval depends on the amount of biting required between the front end portion 31 of the bolt 30 and the outer peripheral surface 16 of the male cylindrical body 13, and the distance between the front end portion 31 of the bolt 30 and the male cylindrical body 13. It is set as appropriate based on the material of the outer peripheral surface 16 (hardness, toughness, roughness, etc.).

  As described above, according to the present embodiment, it is possible to easily and reliably prevent the occurrence of looseness or rattling between the joined steel pipes.

  Although the embodiment of the present invention has been specifically described based on the embodiment, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Lower steel pipe 11 Upper end 12 of lower steel pipe Male thread 13 Male side cylinder (male joint end)
14 Cylindrical portion 15 End surface 16 of cylindrical portion Outer peripheral surface 17 Base 20 Upper steel pipe 21 Lower end 22 of upper steel pipe Opening 23 Female cylinder (female joint end)
24 female screw 25 inner surface seat 27 outer peripheral surface 28 inner peripheral surface 29 through hole 30 bolt 31 tip portion 32 uneven portion 33 outer peripheral surface 34 screw thread 35 lattice-like groove 36 lattice-like convex portion 37 tip portion surface 38 concentric groove 39 Concentric Convex 40 Bottom 41 Bolt Hole 50 Tightening Bolt 100 Steel Pipe Joint Loosening Prevention Structure

Claims (4)

One steel pipe having a male joint end having a thread on the outer periphery, and the other steel pipe having a female joint end having a thread on the inner periphery and screwing with the male joint end. In the structure in which the steel pipes are joined by screwing the joint ends of each other,
The joint end of the female mold includes a through-hole extending from the outer peripheral surface to the inner peripheral surface of the female mold joint end,
A steel pipe joint loosening prevention structure characterized in that a bolt having a concave and convex shape at a front end portion is screwed into the through hole, and the front end portion is pressed against the outer peripheral surface of the male joint end portion.   2. The structure for preventing loosening of steel pipe joints according to claim 1, wherein the concavo-convex shape at the tip of the bolt is configured by a lattice-shaped groove, a convex portion, or a combination thereof.   2. The structure for preventing loosening of steel pipe joints according to claim 1, wherein the concave and convex shape at the tip of the bolt is constituted by a groove or convex part concentric with the bolt cross section or a combination thereof. One steel pipe having a male joint end having a thread on the outer periphery, and the other steel pipe having a female joint end having a thread on the inner periphery and screwing with the male joint end. Is a method for preventing loosening of the structure in which the steel pipes are joined together by screwing the joint ends of each other,
A bolt having a concavo-convex shape is screwed into the through hole from the outer peripheral surface to the inner peripheral surface of the female die joining end provided in the female die, and the tip is attached to the male A method for preventing loosening of steel pipe joints, characterized by pressing against the outer peripheral surface of the joint end of the mold.