JP4632911B2 - Columnar joint structure - Google Patents

Description

  In the present invention, one columnar body adjacent to each other in the axial direction is provided with a shaft-like joint portion, and the other columnar body is provided with a cylindrical joint portion that can be externally fitted to the shaft-like joint portion. By fitting the joint part onto the shaft-like joint part and inserting a key that can be freely inserted and removed from the outside of the cylindrical joint part between the joint parts, the two joint parts are joined to each other so that the two columnar bodies have substantially the same axial center. The present invention relates to a joint structure of columnar bodies that are positioned above and are joined to each other so as not to be inserted and removed.

  Such a joint structure consists of a steel pipe (an example of a columnar body) built into the ground as a pile or a sheet pile, and an erection jig (an example of a columnar body) used when the steel pipe is built into the ground. It is used for joining between steel pipes, or joining steel pipes built in the ground. Conventionally, a cylinder provided on the other columnar body at the shaft-like joint provided on one columnar body After fitting the cylindrical joint part and inserting the key between both joint parts from the outside of the cylindrical joint part, for example, using a bolt that is screwed into the cylindrical joint part to prevent the key from coming out What was comprised is known (for example, refer patent document 1).

JP 2004-84251 A

  However, when using a bolt to prevent the key from being pulled out, there is a problem that it takes time to screw the bolt and it takes time to prevent the key from being pulled out. Furthermore, in the case of the steel pipe and the erection jig described above. If there is, the jig for erection is used over and over again, so it takes time to insert and remove the key, and the male screw of the bolt to be used and the female screw to which the bolt is screwed are crushed. There is a possibility that the rotation operation becomes impossible, and there is room for improvement in this respect.

  The present invention pays attention to such conventional problems, and its purpose is to easily prevent the key from coming out in a short time, even in the case of a steel pipe and a built-in jig. An object of the present invention is to provide a joining structure of columnar bodies that can be used many times without any trouble.

The first characteristic feature of the present invention is a bonding structure of the columnar body to be bonded so as not to connect or disconnect each other on substantially the same axis of the two pillars, provided the columnar body of one of the two pillars A cylindrical joint portion provided on the other columnar body of the two columnar bodies, the cylindrical joint portion being externally fitted to the shaft-shaped joint portion, and the shaft center on the outer periphery of the shaft-shaped joint portion. A shaft-side keyway provided along the circumferential direction of the cylindrical joint portion and an inner circumference of the cylindrical joint portion provided along the circumferential direction, and when the cylindrical joint portion is externally fitted to the axial joint portion Along the direction orthogonal to the shaft center from the outside of the cylindrical joint portion so as to span the cylinder side key groove corresponding to the axis side key groove, and the axis side key groove and the cylinder side key groove. A key that can be freely inserted and removed, and the shaft-like joint portion and the tubular joint along a direction perpendicular to the direction of insertion and removal of the key. A holding hole formed in one of a pin that a telescopically without rotation, to prevent the escape of contact with the key to the end of the exit side of said key with respect to the holding hole, It is in the place with.

According to the first characteristic configuration of the present invention, the cylindrical joint portion provided in the other columnar body is externally fitted to the shaft-like joint portion provided in one columnar body, and is inserted and removed from the outside of the cylindrical joint portion. After inserting a flexible key between both joint parts and joining both joint parts, the pin that prevents the key from coming out is configured to be able to be inserted and removed in a non-rotating state with respect to the holding hole holding the pin. In other words, since it is a pin that can be inserted and removed without rotating like a bolt, it can easily prevent the key from being pulled out in a short time, even in the case of a steel pipe and a built-in jig. As described above, even when the key is repeatedly inserted and removed many times, the key can be prevented from being removed and released many times without any trouble.
And, since the holding hole for holding the pin is provided in either the shaft-like joint part or the cylindrical joint part, by inserting the pin into the holding hole, the prevention of the key from coming out by the pin is sure Thus, although it is possible to easily prevent the key from being pulled out in a short time, it is possible to reliably prevent the key from being accidentally pulled out.

In addition , since the key is provided so as to be freely inserted and removed over a shaft side key groove provided on the outer periphery of the shaft joint portion and a cylinder side key groove provided on the inner periphery of the tube joint portion, By inserting the key over the cylinder-side keyway, both columnar bodies can be firmly joined in a state in which they cannot be inserted or removed.

The second characteristic feature of the present invention is to constitute the key pair of right and left keys, an opening is formed on the outer peripheral surface of the tubular fitting portion, the left side of the key, the said axis-side key groove as over the cylindrical side key groove, before a telescopically from KiHiraki opening to the circumferential direction left, as right side of the key, over said shaft side key groove and the cylinder-side key groove, the a telescopically from the opening to the circumferential direction right, there the holding hole and the pin corresponding to the pair of left and right keys where respectively provided by a left-right pair.

According to the second characteristic configuration of the present invention, the key is composed of a pair of left and right keys, the left key can be inserted from the opening provided in the cylindrical joint portion to the left side, and the right key is the opening. Because it is configured to be freely insertable from the right side to the right side, by inserting two keys across the shaft side keyway and the cylinder side keyway, both columnar bodies can be joined more firmly and impossible to insert and remove, Since a pair of left and right holding holes and pins are provided corresponding to the pair of left and right keys, it is possible to reliably prevent the keys from coming out.
In addition, the opening provided in the cylindrical joint can be effectively used to provide a holding hole in the opening, and the pin inserted into the holding hole can be configured to fit in the opening. In that case, the pin does not protrude from the outer peripheral surface of the cylindrical joint portion, and therefore, as in the steel pipe and the erection jig described above, the two are joined and rotated while being built in the ground. Even in such a case, the pins can be smoothly rotated and built without disturbing the rotation.

The third characteristic configuration of the present invention, each of the pair of left and right pins, the axis portion to be inserted into the holding hole, the extending direction while extending in a direction laterally perpendicular from said axis portion and a extending piece having a tip portion perpendicular to said holding hole are formed along the direction of the axis, wherein the pair of pins rotating insert the axis portion in the holding hole be to dynamic, there is to the tip portion of the pair of left and right pins you close to each other.

According to the third characteristic configuration of the present invention, each of the pair of left and right pins includes an extending piece that extends laterally from the axial center of each pin. By using the extending piece, The pin can be easily inserted and removed from the holding hole.
Then, their respective pins by rotating plugged into respective holding holes, than the tip portions of both the pin you close to each other, for example, by connecting the both tip each other initiative so as not to rotate, the pin Can be more reliably prevented.

According to a fourth characteristic configuration of the present invention, a shaft-like joint portion is provided in one of the columnar bodies adjacent to each other in the axial direction, and a cylindrical joint portion that can be externally fitted to the shaft-like joint portion is provided in the other columnar body. The cylindrical joint portion is externally fitted to the shaft-shaped joint portion, and a key that can be freely inserted and removed from the outside of the cylindrical joint portion is inserted between both joint portions to join both the joint portions, body a joint structure of the columnar body being positioned to insert or remove non joined together substantially on the same axis, is interposed between the cylindrical joint portion and the key, the key exit side of the There is a tension member that abuts against the end portion and the cylindrical joint portion to prevent the key from coming out.

According to the fourth characteristic configuration of the present invention, the cylindrical joint portion provided in the other columnar body is externally fitted to the shaft-like joint portion provided in one columnar body, and is inserted and removed from the outside of the cylindrical joint portion. After inserting a free key between the joint parts and joining the joint parts, a tension member that prevents the key from coming out is detachably interposed between the key and the cylindrical joint part. In this case, it is not necessary to screw in like a bolt, and as described in connection with the first characteristic configuration, it is possible to easily prevent the key from being pulled out in a short time. Even when repeated, the key can be prevented from being released and released many times without any trouble.

According to a fifth characteristic configuration of the present invention, a shaft-like joint portion is provided in one of the columnar bodies adjacent to each other in the axial direction, and a cylindrical joint portion that can be externally fitted to the shaft-like joint portion is provided in the other columnar body. The cylindrical joint portion is externally fitted to the shaft-shaped joint portion, and a key that can be freely inserted and removed from the outside of the cylindrical joint portion is inserted between both joint portions to join both the joint portions, A columnar-body joining structure in which the bodies are positioned on substantially the same axis and are joined to each other so that they cannot be inserted and removed, and the key is provided on the outer periphery of the shaft-like joint portion and the cylindrical key groove The cylinder side keyway provided on the inner periphery of the joint is configured to be freely inserted and removed, the key is composed of a pair of left and right keys, and the left key is on the left side from the opening provided in the cylindrical joint. The right key can be inserted from the opening to the right. Configured to be interposed between the left key and the right key, abutting on the end of the left key and the end of the right key A tension member that prevents the key and the right key from coming off is provided, and the left key and the right side are provided with a locking portion to which the end of the tension member is locked at the end of the key on the extension side. The strut member is composed of a pair of left and right strut members, and the locking portion is composed of a longitudinal groove along a direction perpendicular to the insertion / removal direction of the key. One end portion is a rotating body that fits into the vertical groove and can rotate around a direction perpendicular to the insertion / removal direction of the key, and the pair of left and right tension members include the rotating body in the vertical direction. Fit in the groove each time By doing so, the end portions on the other end side of the pair of left and right projecting members are close to each other, and are interposed linearly along the insertion / removal direction of the key between the left key and the right key. It is in the place where it is configured as follows.

According to the fifth characteristic configuration of the present invention, the key is configured to be detachable between a shaft side key groove provided on the outer periphery of the shaft joint portion and a cylinder side key groove provided on the inner periphery of the cylindrical joint portion. Therefore, as described in relation to the second characteristic configuration, by inserting the key across the shaft side key groove and the cylinder side key groove, both the columnar bodies can be firmly joined in a state where they cannot be inserted and removed. In addition, the key is composed of a pair of left and right keys, the left key can be inserted from the opening provided in the cylindrical joint portion to the left side, and the right key can be inserted from the opening portion to the right side. Therefore, as described in connection with the second characteristic configuration, the two columnar bodies can be firmly joined by inserting two keys across the shaft side keyway and the cylinder side keyway.
Since the tension member is interposed between the pair of left and right keys inserted into the key groove, the tension member that prevents the key from slipping out can be accommodated in the opening of the cylindrical joint. Even in the case of the steel pipe and the jig for erection described above, it can be erected smoothly in the ground.

In a sixth characteristic configuration of the present invention, another shaft-side key groove is provided along the circumferential direction at a position different from the position where the shaft-side key groove is provided on the outer periphery of the shaft-shaped joint portion. By the way.

Embodiments of the columnar joint structure according to the present invention will be described with reference to the drawings.
For example, as shown in FIG. 1, this columnar body joining structure is a circular steel pipe 1 that is an example of a columnar body built into the ground as a pile or a sheet pile, and when the steel pipe 1 is built into the ground. A circular erection jig 2, which is an example of a columnar body to be used, is positioned on substantially the same axis L and joined together so that it cannot be inserted and removed.
Therefore, a shaft joint 3 is connected to the upper end of the steel pipe 1 by welding, and a cylindrical joint 4 that can be fitted onto the shaft joint 3 is integrally formed at the lower end of the erection jig 2. Alternatively, separately formed and connected by welding, a pair of hanging metal fittings 5 having hanging holes 5a are provided on the outer circumference of the steel pipe 1, and the outer circumference of the erection jig 2 is illustrated in FIG. A pair of rotating metal fittings 6 that receive the rotational force from the outside pile construction machine is provided in a protruding manner, and each rotating metal fitting 6 is also provided with a hole 6a for hanging.

The shaft-like joint 3 connected to the steel pipe 1 is formed by casting or forging, or by machining the steel pipe, and the lower part thereof is configured in a cylindrical shape having substantially the same outer diameter as the steel pipe 1, The upper part is constituted by a cylindrical shaft joint portion 7 having a diameter smaller than the outer diameter of the steel pipe 1, and the outer periphery of the shaft joint portion 7 has a cross section as shown in detail in FIGS. A shaft-side keyway 8 having a rectangular shape is continuously provided over the entire circumference.
The cylindrical joint 4 connected to the erection jig 2 is also formed integrally or separately with the erection jig 2 by casting or forging, or by machining a steel pipe, and its lower end is a shaft. The cylindrical joint portion 9 is fitted to the cylindrical joint portion 7, and the inner periphery of the cylindrical joint portion 9 has a cross-sectional shape in a state corresponding to the shaft-side key groove 8 of the shaft-shaped joint portion 7. A rectangular cylinder-side keyway 10 is provided.

The cylindrical joint portion 9 has openings 11 that have substantially the same or slightly larger vertical width as the cylinder side keyway 10 and penetrate the wall of the joint portion 9 in the inner and outer directions, for example, at equal intervals in the outer circumferential direction. Four cylinder side key grooves 10 are provided on the inner periphery of the cylindrical joint portion 9 so as to be positioned between the openings 11. Further, on the outer periphery of the cylindrical joint portion 9, a total of four non-rotating cylindrical side recessed portions 12 are provided between the openings 11, and the outer periphery of the lower cylindrical portion of the shaft joint 3 is provided. In addition, a total of four anti-rotation shaft side recesses 13 are provided corresponding to each cylinder side recess 12.
Then, a locking key 14 is fitted over the cylindrical side recessed part 12 on the cylindrical joint 4 side and the axial side recessed part 13 on the axial joint 3 side, and fixed with a bolt 15 or the like. Relative rotation with the shaft-shaped joint 3 is prevented, and the rotational force from the pile construction machine is transmitted to the shaft-shaped joint 3 side via the tubular joint 4.

The above is the configuration that is generally common to each embodiment. Hereinafter, the first embodiment is based on FIGS. 1 to 4, and the improved configuration of the first embodiment is based on FIGS. 5 to 9. Each embodiment will be described with reference to FIGS. 10 and 11, and a modified configuration of each embodiment will be referred to.
However, in order to avoid redundant description, the description of the configuration described above and the configuration having the same action will be omitted by attaching the same reference numerals, and the unique configuration in each embodiment will be mainly described.

(First embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, the shaft-side key groove 8 of the shaft-like joint portion 7 and the cylinder-side key groove of the tubular joint portion 9 from each opening 11 of the tubular joint portion 9. A headed key 16 formed so as to be freely inserted and removed over 10 comprises a pair of left and right keys 16a and 16b, that is, a left key 16a and a right key 16b.
Specifically, the left key 16a can be inserted from the opening 11 to the left while the cylindrical joint 9 is fitted on the shaft joint 7, and the right key 16b can be inserted from the opening 11 to the right. A pin 17 is provided to prevent the keys 16a and 16b from coming out when the keys 16a and 16b are inserted.

The pin 17 also includes a left pin 17a and a right pin 17b corresponding to the pair of left and right keys 16a and 16b. Each pin 17a and 17b is laterally extended in a direction substantially perpendicular to the axis of the pin. L-shaped extending pieces 18 that extend to each other are integrally provided, and a through hole 18 a is provided near the tip of each extending piece 18.
The pin 17 is configured to be able to be inserted / removed in a non-rotating state with respect to the holding hole 19 that holds the pin 17. In other words, the pin 17 is not inserted / removed by screwing with rotation like a bolt and a bolt hole, Although it is possible, it is configured so that it can be inserted into and removed from the holding hole 19 without rotating.

Corresponding to the pair of left and right pins 17a and 17b, the holding hole 19 is also composed of a left holding hole 19a and a right holding hole 19b. The holding holes 19a and 19b are shown in FIG. 2 (a) and FIG. The cylindrical joint portion 9 is provided in a direction B (see FIG. 3B and FIG. 4) substantially orthogonal to the insertion / removal direction of the key 16 indicated by A.
Specifically, the left holding hole 19a corresponds to the head of the left key 16a, and the right holding hole 19b corresponds to the head of the right key 16b. It is provided from the lower surface to the bottom.
And on the outer periphery of the cylindrical joint portion 9, a pair of left and right recessed portions 20 a and 20 b corresponding to the holding holes 19 a and 19 b, that is, along a direction B orthogonal to the insertion / removal direction A of the key 16, It is provided in a state that continues upward from the opening 11.

Next, the procedure for joining the steel pipe 1 and the erection jig 2 to each other will be described. For example, the erection jig 2 is suspended and held by using a crane or the like not shown. The cylindrical joint portion 9 on the jig 2 side is externally fitted to the shaft-shaped joint portion 7 on the steel pipe 1 side, and alignment is performed so that the tube-side recessed portion 12 and the shaft-side recessed portion 13 for preventing rotation face each other. Do.
In this fitted state, the shaft-side key groove 8 of the shaft-shaped joint portion 7 and the tube-side key groove 10 of the tubular joint portion 9 are set to face each other. 16a is inserted from the opening 11 to the left side, and the right key 16b is inserted from the opening 11 to the right side. As shown in FIGS. 2 (a) and 3 (a), both keys 16a and 16b are inserted into both key grooves 8 as shown in FIG. , Insert over 10.
Thereby, the steel pipe 1 and the erection jig 2 are positioned on substantially the same axis L and are joined together so as not to be inserted and removed.

In this state, as shown in FIG. 3 (B), the pins 17a and 17b are positioned in the corresponding recessed portions 20a and 20b and moved downward, so that FIG. 2 (B) and FIG. ), The pins 17a and 17b are inserted into the corresponding holding holes 19a and 19b. Thereafter, as shown in FIG. 3 (d), the pins 17a and 17b are slightly rotated so that the extended pieces 18 of the pins 17a and 17b are close to each other in the opening portion 11, and FIG. As shown in FIG. 4, the wire 21 is inserted and tied between the through holes 18 a of both the extending pieces 18.
As a result, the pins 17a and 17b are prevented from rotating with each extending piece 18 positioned in the opening 11, so that the pins 17a and 17b can be prevented from coming out of the holding holes 19a and 19b. As a result, the keys 16a and 16b are prevented from coming out of the key grooves 8 and 10.

Then, a locking key 14 is fitted into the cylindrical side recessed part 12 and the axial side recessed part 13 facing each other so as to straddle both the recessed parts 12, 13, and is fixed by bolts 15, and the cylindrical joint part 9 And the shaft-like joint portion 7, in other words, the relative rotation between the erection jig 2 and the steel pipe 1 is prevented, and the joining operation is completed.
Thereafter, the steel pipe 1 and the erection jig 2 are suspended by a crane or the like using the metal fitting 5 for suspending the steel pipe 1 and held in place, and the steel pipe 1 is rotated by a pile construction machine not shown. However, if necessary, the same operation is repeated, and a plurality of steel pipes 1 are sequentially built while being connected to each other.

In the first embodiment described in detail above, as is clear from FIGS. 2 (c) and 4, each pin 17a, with the pair of left and right pins 17a, 17b preventing both keys 16a, 16b from coming out. The tip of the extended piece 18 extending from 17 b protrudes outward from the outer periphery of the cylindrical joint portion 9.
In order to avoid the protrusion of the extended piece 18 from the outer periphery of the tubular joint portion 9, for example, it is possible to change the shape of the extended piece 18. FIG. 5 and the embodiment disclosed in FIG.

Also in the embodiment according to this improved configuration, the pair of left and right pins 17a and 17b includes the L-shaped extending piece 22 extending sideways in a direction substantially orthogonal to the axial center of the pin. Unlike the extending piece 18 in the embodiment, the distal end portion of each extending piece 22 extends downward along the axial center of the pins 17 a and 17 b, and on the other hand, on the outer periphery of the cylindrical joint portion 9, An extension piece recess 23 that accommodates the tip of the extension piece 22 is provided continuously downward from the opening 11.
Therefore, according to this embodiment, the extension pieces 22 of the pins 17a and 17b are brought close to each other, and both the extension pieces 22 are inserted and tied between the through holes 22a of the extension pieces 22. By accommodating the tip of 22 in the extension piece recess 23, the pins 17 a and 17 b and the extension piece 22 are completely stored inside the outer periphery of the cylindrical joint portion 9.
In this embodiment, the tip of the extension piece 22 can be extended upward along the axis of the pins 17a and 17b, and the extension piece recess 23 can be provided upward from the opening 11. In any case, the procedure for joining the steel pipe 1 and the erection jig 2 to each other is not particularly different from that of the first embodiment.

The first embodiment described in detail above and the embodiment related to the improved configuration are configurations suitable for use in the “rotary press-fitting method” in which the steel pipe 1 is mainly built in the ground while rotating, and is strong during construction. When used in the “blow / vibration method” to which impact force or vibration is applied, it is preferable to make some improvements in order to improve the yield strength in the joint structure, and an example of the improved configuration is based on FIGS. 7 and 8. I will explain.
In the embodiment according to this improved configuration, the erection jig 2 and the cylindrical joint 4 are integrally formed, and the thickness of the erection jig 2 and the cylindrical joint 4 is high in impact force and vibration. Therefore, the outer diameter of the tubular joint 4 including the tubular joint portion 9 is larger than the outer diameter of the lower portion of the shaft joint 3, in other words, the outer diameter of the steel pipe 1. Is configured to have a considerably large outer diameter.

In addition, the key 16 has a longer length C and / or a higher height D in the vertical direction than the embodiment shown in FIGS. A key 16 having a large lateral width E and a large area in the vertical direction and the lateral direction is used. The key 16 is configured to suppress wear and damage of the key 16 by improving the bearing strength. ing.
As for the pin 17, a stepped pin 17 composed of a large diameter portion F and a small diameter portion G is used in order to reliably prevent the key 16 from coming off due to a strong impact force or vibration. That is, the small diameter portion G is configured to have a larger diameter than the pin 17 shown in FIGS. 1 to 6, and the large diameter portion F having a larger diameter than the small diameter portion G is configured to prevent the key 16 from coming out. ing.

Further, in order to alleviate the influence of the strong impact force or vibration on the joint structure as much as possible, the length of the erection jig 2 is increased, or as shown in FIG. The steel pipe H is connected to the upper part by welding, and the length of the erection jig 2 is substantially increased. By lengthening the erection jig 2 in this way, the force point of impact applied during construction can be separated from the joint structure part, and load concentration and heat transfer to the joint structure part can be suppressed. .
In addition to the tenon I at the upper end of the shaft-like joint portion 7, the tenon J is also provided at the lower end of the tubular joint portion 9, so that it can sufficiently withstand lateral vibration.
In the embodiment shown in FIGS. 7 and 8, the pin 17 having the extension piece 22 as shown in FIGS. 5 and 6 is used, and the extension piece 22 is connected to the cylindrical joint portion 9. Of course, it is possible to configure so as not to protrude outward from the outer periphery of the.

However, in the embodiment shown in FIG. 7 and FIG. 8, depending on the ground conditions, the shaft-side keyway 8 on the shaft-like joint portion 7 side is damaged by the erection and vibration construction method. The part may bulge outward. However, the shaft-side key groove 8 cooperates with the cylinder-side key groove provided in the cylindrical joint portion of another steel pipe 1 to be joined above after the erection work, so that both the steel pipes 1 are removed. Since it contributes to stopping, if the shaft-side key groove 8 is damaged, the steel pipes 1 are unreliably prevented from coming off, and if the damaged part bulges outward, the cylindrical joint part of another steel pipe 1 There is a possibility that it will be difficult to even fit the shaft to the shaft joint portion 7.
In order to avoid such fears, for example, as shown in FIG. 9, the shaft corresponding to the cylinder side key groove 10 of the cylindrical joint portion 9 in the erection jig 2 with respect to the shaft joint portion 7. In addition to the side key groove 8, a shaft side key groove K corresponding to the cylinder side key groove of the cylindrical joint portion in another steel pipe 1 joined upward is previously provided above the shaft side key groove 8. You can also. In this case, even if the shaft side keyway 8 is damaged and bulges outward, the tubular joint portion of another steel pipe 1 can be reliably fitted onto the shaft joint portion 7, and By using the shaft side keyway K located above, both steel pipes 1 can be reliably prevented from coming off.

(Second Embodiment)
In the second embodiment, as shown in FIGS. 10 and 11, as in the first embodiment, an opening 11 is provided in the cylindrical joint portion 9, and extends over the shaft side key groove 8 and the cylinder side key groove 10. The headed key 16 formed so as to be freely inserted and removed is also constituted by a pair of left and right keys 16a and 16b.
Unlike the first embodiment, the first embodiment prevents the keys 16a and 16b from being pulled out by the pair of left and right pins 17a and 17b, whereas in the second embodiment, the pins 17a and 17b A strut member 24 is used instead of 17b, and the strut member 24 prevents the keys 16a and 16b from coming out.

The tension member 24 is composed of a pair of left and right tension members 24a and 24b formed in an L shape in plan view. The left tension member 24a has a semicircular cross section formed on the head of the left key 16a. A rotating body 26 made of a rod-shaped body having a circular cross section that fits into the vertical groove 25a is integrally provided, and a through hole 27 is provided near the end opposite to the rotating body 26.
Similarly, the right tension member 24b is integrally provided with a rotating body 26 formed of a rod-shaped body having a circular cross section that fits into a semicircular vertical groove 25b formed in the head of the right key 16b. A through hole 27 is also provided.

In this second embodiment, the procedure for joining the steel pipe 1 and the erection jig 2 to each other is that the left and right keys 16a and 16b are connected to the shaft side keyway 8 of the shaft joint 7 and the cylindrical joint 9. There is no difference from the first embodiment until it is inserted over the cylinder side keyway 10.
Thereafter, in the second embodiment, as shown in FIG. 11, the rotary members 26 of the respective tension members 24a and 24b are positioned in the longitudinal grooves 25a and 25b of the corresponding keys 16a and 16b, and the tension members 24a and 24b. Are rotated so that the tip portions of the two members are close to each other, and the wire 21 is inserted and tied between the through holes 27 of the both projecting members 24a and 24b.

As a result, both the tension members 24a and 24b are linearly formed along the insertion / removal direction A of the key 16, and are interposed between the pair of left and right keys 16a and 16b.
Therefore, for example, even if a force in the pull-out direction is applied to one of the pair of left and right keys 16a and 16b, the pull-out action is prevented by the both-stretch members 24a and 24b. The escape from the 16b key grooves 8 and 10 is prevented.
According to the second embodiment, in order to prevent the key 16 from coming out by using the tension member 24, the holding holes 19a and 19b, the recessed portions 20a and 20b, which are indispensable in the first embodiment, are formed in the cylinder. It is not necessary to provide the joint 9.

[Another embodiment]
(1) In the first and second embodiments, the example in which the key 16 is configured by a pair of left and right keys 16 a and 16 b, that is, two keys 16 a and 16 b is illustrated, but the key 16 is configured by one key 16. You can also.
In that case, in the first embodiment, only one pin 17 for preventing the key 16 from coming off may be provided, and therefore, only one holding hole 19 for holding the pin 17 may be provided. In the second embodiment, the tension member 24 is detachably interposed between the single key 16 and the cylindrical joint portion 9.

Further, in the first and second embodiments, the configuration in which the key 16 is inserted and removed across the shaft side key groove 8 of the shaft joint portion 7 and the cylinder side key groove 10 of the tubular joint portion 9 is shown. In this embodiment, the key groove 8 can be provided only on the shaft joint 7 side, and FIGS. 12 and 13 show the embodiment.
In this other embodiment, a concave portion 28 for storing a key is provided in the tubular joint portion 9, and a slit 29 is formed in the concave portion 28 in place of the tubular side key groove 10. On the other hand, the key 16 is integrally protruded from a curved plate-like key holding member 30 that can be stored in the recess 28, and the key 16 passes through the slit 29 and is inserted into the shaft-side key groove 8. Thus, the key holding member 30 is set so as to be housed in the recess 28 of the cylindrical joint portion 9.
In this other embodiment, the key insertion / removal direction A is the radial direction of the cylindrical joint portion 9, and the key 16 is held by the pin 17 held in the holding hole 19 provided along the direction B perpendicular to the insertion / removal direction A. Is prevented from coming out.

  In the first embodiment, an example in which the holding hole 19 for holding the pin 17 is provided on the cylindrical joint portion 9 side is shown. For example, as shown in FIGS. 14 and 15, the shaft-like joint portion 7 is provided. A holding hole 19 may be provided on the side, and the pin 16 inserted into the holding hole 19 may be configured to prevent the key 16 from coming out.

(2) In the second embodiment, an example in which the tension member 24 is configured by a pair of left and right tension members 24a and 24b has been described. However, the single tension member 24 prevents the pair of left and right keys 16a and 16b from being pulled out. You can also.
For example, as shown in FIG. 16, the tension member 24 is formed of a single spring material, and the elastic force of the spring material is effectively used to prevent the two keys 16a and 16b from coming out. As shown in FIG. 17, the tension member 24 is formed of a single block, and the block-shaped tension member 24 is interposed between the keys 16a and 16b to prevent the keys 16a and 16b from coming out. Can be configured.

  In addition, in the embodiments so far, the steel pipe 1 and the erection jig 2 which are built in the ground are shown as examples of the columnar bodies that are joined so as not to be inserted and removed. Can do.

The disassembled perspective view which shows the joining structure of the columnar body by 1st Embodiment Transverse plan view showing the main part of the joint structure according to the first embodiment A longitudinal side view showing a main part of the joint structure according to the first embodiment. The perspective view which shows the principal part of the joining structure by 1st Embodiment. The disassembled perspective view which shows the principal part of the improved structure of 1st Embodiment. Transverse plan view showing the main part of the improved configuration of the first embodiment The disassembled perspective view which shows the principal part of the improved structure of 1st Embodiment. Longitudinal side view showing the main part of the improved configuration of the first embodiment Longitudinal side view showing the main part of the improved configuration of the first embodiment The disassembled perspective view which shows the principal part of the junction structure by 2nd Embodiment. Transverse plan view showing the main part of the joint structure according to the second embodiment The disassembled perspective view which shows the principal part of the junction structure by another embodiment Vertical sectional side view showing a main part of a joint structure according to another embodiment The disassembled perspective view which shows the principal part of the junction structure by another embodiment The cross-sectional top view which shows the principal part of the junction structure by another embodiment The cross-sectional top view which shows the principal part of the junction structure by another embodiment Partially cutaway front view showing the main part of the joint structure according to another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Columnar body 7 Shaft joint part 8 Shaft side keyway 9 Tubular joint part 10 Cylinder side keyway 11 Opening part 16 Key 16a Left side key 16b Right side key 17 Pin 17a Left side pin 17b Right side pin 18, 22 Extending piece 19 Holding hole 19a Left holding hole 19b Right holding hole 24 Stretch member A Key insertion / removal direction B Direction perpendicular to key insertion / removal direction L Center of columnar body

Claims (6)

A columnar joint structure in which two columnar bodies are joined together on a substantially identical axis so that they cannot be inserted and removed,
A shaft-like joint provided in one of the two columnar bodies; and
A cylindrical joint portion provided on the other columnar body of the two columnar bodies, and capable of being externally fitted to the shaft-shaped joint portion;
A shaft-side keyway provided on the outer periphery of the shaft-shaped joint portion along the circumferential direction of the shaft center;
A cylindrical side key groove corresponding to the axial side key groove when the cylindrical joint part is externally fitted to the axial joint part, provided along the circumferential direction on the inner circumference of the cylindrical joint part;
A key that is detachable along the direction perpendicular to the axis from the outside of the cylindrical joint portion so as to span the shaft-side key groove and the cylinder-side key groove;
A holding hole formed in one of the shaft-like joint portion and the tubular joint portion along a direction orthogonal to the insertion / removal direction of the key,
A columnar joint structure comprising: a pin that can be inserted / removed without being rotated with respect to the holding hole, and that is in contact with an end of the key that is pulled out to prevent the key from being pulled out. The key is composed of a pair of left and right keys, and an opening is formed on the outer peripheral surface of the cylindrical joint portion,
The left-side key is detachable from the opening to the left side in the circumferential direction so as to span the shaft-side key groove and the cylinder-side key groove,
The right key can be freely inserted and removed from the opening to the right side in the circumferential direction so as to span the shaft side key groove and the cylinder side key groove.
The columnar body joining structure according to claim 1, wherein the holding hole and the pin corresponding to the pair of left and right keys are provided in pairs. Each of the pair of left and right pins has an axial part that is inserted into the holding hole, and an extending piece that has a tip part that extends laterally from the axial part in a direction orthogonal to the extending direction and that is orthogonal to the extending direction. And comprising
The holding hole is formed along the direction of the axis,
The columnar body joining structure according to claim 2, wherein the distal end portions of the pair of left and right pins are close to each other by inserting the shaft center portion into the holding hole and rotating the pair of left and right pins. One columnar body adjacent to each other in the axial direction is provided with a shaft-like joint portion, and the other columnar body is provided with a cylindrical joint portion that can be fitted over the shaft-like joint portion. The two columnar bodies are positioned on the same axis by inserting the key that can be inserted and removed from the outside of the cylindrical joint part between the joint parts. The columnar bodies are joined together so that they cannot be inserted and removed,
A columnar body that is interposed between the key and the cylindrical joint portion and includes a tension member that abuts the end portion on the key withdrawal side and the cylindrical joint portion to prevent the key from coming out. Junction structure. One columnar body adjacent to each other in the axial direction is provided with a shaft-like joint portion, and the other columnar body is provided with a cylindrical joint portion that can be fitted over the shaft-like joint portion. The two columnar bodies are positioned on the same axis by inserting the key that can be inserted and removed from the outside of the cylindrical joint part between the joint parts. The columnar bodies are joined together so that they cannot be inserted and removed,
The key is configured to be detachable between a shaft-side key groove provided on the outer periphery of the shaft-like joint portion and a cylinder-side key groove provided on the inner periphery of the cylindrical joint portion. It is composed of a key, the left key can be inserted into the left side from the opening provided in the cylindrical joint, and the right key can be inserted into the right side from the opening,
The left key and the right key are interposed between the left key and the left end of the left key and the right end of the right key. With a tension member that prevents the right key from coming out,
The left-side key and the right-side key each include a locking portion that locks the end of the tension member at the end of the key on the exit side ,
The tension member is constituted by a pair of left and right tension members, and the locking portion is constituted by a longitudinal groove along a direction perpendicular to the insertion / removal direction of the key,
One end of each of the pair of left and right strut members is a rotating body that fits into the longitudinal groove and is rotatable about a direction perpendicular to the insertion / removal direction of the key,
The pair of left and right strut members are fitted to the vertical grooves to rotate the pair of left and right strut members, so that the ends on the other end side of the pair of left and right strut members are close to each other, and the left side A columnar joint structure configured to be linearly interposed between the key and the right key along the insertion / removal direction of the key .   6. The shaft-side joint portion according to claim 1, wherein another shaft-side key groove is provided along the circumferential direction at a position different from a position where the shaft-side key groove is provided on an outer periphery of the shaft-shaped joint portion. The columnar joint structure according to item.

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