JPH07317151A - Joint structure of space truss - Google Patents

Abstract

PURPOSE:To easily connect a joint body with a truss member with a simple structure by rotating a sleeve from the outside to rotate a bolt, and also feeding it in the axial direction. CONSTITUTION:Since a bolt 2, 2 inserted to a sleeve 3... is axially movable but can not be radially rotated, the bolt 2 is integrally rotated with the sleeve 3 when the sleeve 3 is rotated around the axial line from the outside. In this case, since an engaging body provided on bush 6, 6 side is engaged with a feeding male screw 2e, the bolt 2 is axially fed out by a driving gear mechanism simultaneously with the rotation by the sleeve 3. The state of the bolt 2 in the sleeve 3 inner part can be seen through a hole 3c opened in the sleeve 3 to confirm the screwing state of the bolt 2 to the joint body. A constraining vis 7, 7 is inserted to the holes 3c, whereby the dropping-out or loosening of the bolt 2 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for centrally connecting upper and lower chord members and diagonal members in a space truss for constructing a roof of a bridge or a building structure.

[0002]

2. Description of the Related Art A building structure such as a large dome is constructed by a three-dimensional truss structure using, for example, a steel pipe as a chord member and a diagonal member. The three-dimensional truss structure has recently been widely adopted because it is the most efficient construction method and has sufficient strength.

In actual construction work of a truss, it often takes a lot of time to join the joint body and the chord member due to a construction error. On the other hand, in the case of a joint proposed by the applicant of the present application and published as Japanese Patent Application Laid-Open No. 4-80455, a bolt to be screwed into the joint body is externally inserted by a sleeve that is movable integrally in the axial direction, Since the feed nut for feeding the bolt is provided, the bolt and the hole on the joint side can be easily joined.

Further, since the feed ring for feeding the bolt is provided with an elastic engagement mechanism utilizing a plunger structure and the tip thereof is hung on the male screw of the bolt, the bolt can be fed smoothly even if the bolt is screwed in an unreasonable posture. Moreover, you can work without damaging the screws.

[0005]

However, since the elastic engaging mechanism provided on the feed ring and provided as a mechanism for feeding the bolt has a plunger structure, the number of parts is increased and a commercially available product is used instead. In this case, the unit price of the plunger is relatively high, and the number of uses is considerably large in the case of a large building, which causes a problem in cost.

Further, when the bolt is screwed into the joint for connection, the bolt is hidden in the sleeve, so that it cannot be confirmed from the outside how much the screw is coupled. Therefore, in the actual construction,
It becomes a work procedure in which the bolt is sufficiently screwed into the joint by tightening the sleeve more than necessary, which is not preferable in terms of work load and construction time.

Furthermore, after the bolts are screwed into the joint, the threaded connection between these bolts and the joint is only maintained. For this reason, if the construction is completed with the connection between the bolt and the joint being weak during construction, the bolt will be affected by vibrations and other forces such as compression, tension and bending with other string materials. May fall out of the joint, leading to a decrease in strength of the structure.

As described above, in the conventional joint of the space truss, although the sleeve for the tool hanging simplifies the construction, there is a possibility that the construction state cannot be confirmed and loosening may occur after the completion of construction.

The problem to be solved in the present invention is to make the joint for connecting the truss members easy and to have a simpler structure and to be able to confirm the connected state and to prevent the bolt from loosening.

[0010]

DISCLOSURE OF THE INVENTION The present invention is a joint structure in which a main body of a joint and a truss member are joined to an end portion of the truss member by a rotatably mounted bolt, the bolt having at least a tip end side thereof. A male screw for feeding is provided on the peripheral surface except for, and a sleeve is externally inserted around the bolt between the main body and the truss member, and the sleeve connects the bolt so as to be movable in the axial direction and non-rotatable around the axis. Along with the hole, the circumferential surface of the bolt is exposed to the outside, the bush is provided with an engaging body that enters into the trough of the male screw for feeding the bolt, and the restraint member that restrains the bolt from being pulled out is provided in the hole provided in the sleeve. It is characterized in that it can be attached.

Further, the engaging body is constituted by a half-divided feed ring made of elastically deformable wire material and provided with an engagement piece extending toward the center side of the feed ring.
The feed ring is fitted around the end of the bush by elastic deformation, and the engaging piece is inserted into the bush through the mounting hole opened in the radial direction, and the tip of this engaging piece can be engaged with the male screw for feeding. It may be configured.

[0012]

The bolt inserted into the sleeve is movable in the axial direction and cannot be rotated in the radial direction. Therefore, when the sleeve is externally rotated about its axis, the bolt rotates together with the bolt. Further, since the engaging body provided on the bush side is engaged with the male screw for feeding, the bolt is sent out by the screw gear mechanism in the axial direction simultaneously with the rotation of the sleeve, and the screwing of the joint into the main body rotates the sleeve. Done by

The holes formed in the sleeve allow the status of the bolt inside the sleeve to be checked, and the position of the bolt on the main body of the joint can be confirmed. Then, after the bolt is tightened and connected, the restraint member is inserted into the hole to regulate the position of the bolt, so that the bolt is prevented from coming off or coming loose.

[0014]

1 is a partial sectional view of a joint structure showing an embodiment of the present invention.

The body 1 of the joint is provided with a female screw hole 1a whose axis extends in a predetermined direction. A high tension bolt 2 screwed into the female screw hole 1a and a sleeve 3 are arranged around the bolt 2. ing. Further, a bush 6 through which the bolt 2 is inserted is attached to an end portion of a truss member 5 such as steel pipes which are upper and lower chord members and diagonal members, and the bush 6 is provided with a feed ring 4 as an engaging body.

As shown in FIG. 2, the bolt 2 has a male screw 2a formed in the female screw hole 1a at its tip end side, and is connected between the male screw 2a and the head 2b and connected to the male screw 2a. Guide 2 whose outer diameter is slightly smaller than the inner diameter of sleeve 3
It has c. Then, a feeding male screw 2d having a thread diameter equal to the outer shape of the guide 2c is formed so as to be continuous with the guide 2c, and a female screw hole 2e is provided in the guide 2c in the radial direction. A screw is screwed into this female screw hole 2e to form an engaging pin 2f.

Although the entire bolt 2 can be manufactured as an integral body, the guide 2c and the feeding male screw 2d can be manufactured.
Is a separate member and is externally inserted into a commercially available bolt 2, and the engaging pin 2f
It is also possible to integrate them by utilizing, and in the embodiment, this is shown as a separate body.

The sleeve 3 has a hexagonal vertical cross section as shown in FIG. 3 (a vertical cross sectional view taken along the line AA in FIG. 1) and has a holding hole 3a through which the bolt 2 is inserted in the axial direction. is doing. The inner diameter of this holding hole 3a is the guide 2c of the bolt 2
Shall be slidable in the axial direction. Holding hole 3a
An engaging groove 3b into which the engaging pin 2f of the bolt 2 is movably fitted is carved on the inner circumference of the entire length of the shaft in the axial direction, and as shown in FIG. The screw hole 3c is provided so as to penetrate to the holding hole 3a.

When the bolt 2 is passed through the sleeve 3 by the bolt 2 and the sleeve 3, the guide 2c of the bolt 2 is slidably incorporated in the holding hole 3a and the engaging pin 2f is engaged. It fits into the groove 3b and moves only in the axial direction. Therefore, when a tool is put on the hexagonal outer circumference of the sleeve 3 and is rotated, the engaging pin 2f
The bolt 2 is integrally rotated by the engagement between the bolt 2 and the engaging groove 3b.

The bush 6 is incorporated so that the opening 6a through which the main body of the bolt 2 is slidable is opened in the axial direction and the head 2b is located inside the truss member 5. Therefore, in the actual assembly, after the bolt 2 is passed through the opening 6a, the guide 2c and the male screw for feeding 2d are externally inserted from the outside of the bush 6 and integrated by the engaging pin 2f, as described above. By doing so, the bolt 2 can be incorporated into the truss member 5 as shown in the lower left of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.
FIG. 5 is a front view of the feed ring 4.

The feed ring 4 is formed by bending a steel wire rod having an outer shape of about 2 to 4 mm into a circular shape. One end of the steel wire rod is bent toward the center side to form an engaging piece 4a.
The tip of a is formed in a tapered shape. The feed ring 4 has a holding groove 6b formed on the peripheral surface of the bush 6 on the tip side.
(See a partially enlarged view of FIG. 1) and is attached by inserting the engaging piece 4a into the mounting hole 6c opened in the radial direction from the holding groove 6b.

Since the feed ring 4 is a half member made of a steel wire material, when it is attached to the bush 6, the engaging piece 4
a is deformed so as to spread outward, and then the engaging piece 4a
It is possible to fit and fix the holding groove 6b simply by inserting the into the mounting hole 6c. When it is fixed like this, FIG.
Also, as shown in FIG. 6, the tip of the engaging piece 4a comes into the valley of the male screw 2d for feeding of the bolt 2.

In the above structure, the bolt 2 is passed through the opening 6a before the bush 6 is attached to the truss member 5, and the member having the guide 2c and the male screw 2d for feeding is attached to the bolt 2 as described above. This is integrated by the insertion engagement pin 2f. Next, as shown in the lower left of FIG. 1, the male screw 2d for feeding is positioned so as to enter the opening 6a of the bush 6, and then the feeding ring 4 is mounted around the holding groove 6b of the bush 6.

Next, the sleeve 3 is externally inserted into the bolt 2, and the engaging pin 2f of the bolt 2 is fitted into the engaging groove 3b of the sleeve 3, and then the bolt 2 is connected to the main body 1. This connecting work is started by setting the posture of the truss member 5 so that the tip of the bolt 2 is aligned with the female screw 1a to be connected as in the lower left diagonal member in FIG. Then, as the sleeve 3 is rotated by hand, the bolt 2 is also rotated by the engagement between the engagement screw 3b and the groove 2c. On the other hand, since the tip of the engaging piece 4b of the feed ring 4 fits into the valley 2d-1 of the male screw 2d for feeding as shown in FIG. 6, the valley moves as guided by the engaging piece 4b. Then, the bolt 2 is fed by the sleeve 3 in addition to being rotated. Therefore, as the sleeve 3 rotates, the male screw 2a on the tip side of the bolt 2 advances into the female screw hole 1a while rotating,
The bolt 2 can be screwed and connected to the female screw hole 1a like the horizontal member in FIG.

Since the feed ring 4 is elastically deformable,
If the bolt 2 has a certain amount of play with respect to the holding hole 3a, the pointing direction of the tip of the bolt 2 can be swung within a certain range, and the feed can be surely given. Therefore, the axis line of the truss member 5 is the female screw hole 1a of the main body 1.
Even if they do not exactly match with each other, the female screw hole 1a receives this due to the change in the posture of the bolt 2, and the joining is easily started.

When the bolt 2 is screwed into the main body 1, the outer peripheral surface of the bolt 2 can be seen from the outside through the female screw hole 3c formed in the sleeve 3. Then, as shown in FIG. 1, when the end of the feeding male screw 2d reaches the position of the female screw 3c, the screwing amount between the male screw 2a and the female screw hole 1a has a sufficient relationship, If the positions of the members of the guide 2c and the male screw 2d for feeding are determined, it is possible to know that the fastening is completed by checking them.

Further, after this confirmation, a retaining screw 7 as a retaining member is screwed into the female screw hole 3c as a retaining member. As shown on the side of the truss member 5 in the horizontal posture in FIG. 1, the restraining screw 7 has its tip inserted into the holding hole 3a, and the guide 2c externally fixed around the bolt 2 and the male screw 2 for feeding.
The member of d can be engaged.

Here, when tightening the bolt 2, its position changes variously. However, even if the bolt 2 moves in a loosening direction, the tip of the restraint screw 7 is fixed to the feed screw 2d as shown in FIG. It is possible to taper-engage the taper surface 2g at the terminal end and prevent further loosening of the bolt 2.

In the connected state of the truss constructed as described above, since both end surfaces of the sleeve 3 and the feed ring 4 contact the peripheral surface of the main body 1 and the bush 6, respectively, the compressive stress applied to the truss member 5 is increased. Are loaded directly onto the body 1 by means of bolts 2, sleeves 3 and feed nuts 4. Therefore, the compression force is effectively absorbed, and the strength of the entire system is improved.

In the embodiment, the feed ring 4 is formed in a ring shape using a steel wire, but instead of this, elastically deforming the holding groove 6b of the bush 6 to sandwich it from the inside of the mounting hole 6c. Projecting and feeding male screw 2d valley 2d-
The shape may be such that it enters into 1. In addition, the threaded state of the bolt 6 and a female screw hole 6c for preventing the bolt from coming off.
And the retaining screw 7 screwed into this, instead of the sleeve 3
It is also possible to make a structure in which a hole is formed in the hole and a pin is driven into the hole.

[0032]

According to the present invention, the engaging member provided on the bush side can feed the sleeve to the bolt when the sleeve is rotationally operated, and the structure is further simplified as compared with the case of using a conventional plunger or the like. .

Further, by providing the hole in the sleeve, the bolt position at the time of tightening the bolt can be confirmed from the outside, so that the connection of the bolt to the main body of the joint can be surely performed, and the strength of the structure can be secured. Can be properly maintained.

Further, since the bolt is prevented from coming off or coming loose by restraining the bolt through the restraint member through the hole, the coupling force between the joint body and the joint body is lowered even if it is affected by vibration or the like. Therefore, the strength of the structure can be maintained more effectively.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a joint portion of a space truss showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of a bolt.

FIG. 3 is a view showing a cross section of a sleeve and a bolt taken along the line AA of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a front view of a feed ring.

FIG. 6 is a longitudinal cross-sectional view of a main part showing an engaged state of an engaging piece of a feed ring and a male feed screw.

[Explanation of symbols]

 1 Main body 2 Bolt 2a Male screw 2b Head 2c Guide 2d Male screw for feeding 2e Female screw hole 2f Engaging pin 2g Tapered surface 3 Sleeve 3a Holding hole 3b Engaging groove 3c Female screw hole 4 Feed ring (restricting body) 4a Engaging Piece 5 Truss member 6 Bush 6a Opening 6b Holding groove 6c Mounting hole 7 Restraint screw (restraint member)

Claims (2)

[Claims] 1. A joint structure in which a main body of a joint and a truss member are joined to an end portion of the truss member by a rotatably mounted bolt, wherein the bolt has a male screw for feeding at least on a peripheral surface except a tip side thereof. A sleeve is externally inserted around the bolt between the main body and the truss member, the sleeve connects the bolt so as to be movable in the axial direction and non-rotatable around the axis, and has a peripheral surface of the bolt outside. Of the three-dimensional truss capable of mounting a restraining member for restraining the bolt from coming off in the hole provided in the sleeve, the engaging body entering the valley of the male screw for feeding of the bolt provided in the bush. Joint structure. 2. The engaging member is a half-divided feed ring made of elastically deformable wire material and is provided with an engagement piece extending toward the center side of the feed ring. The feed ring is fitted around the end of the bush by elastic deformation, the engaging piece is inserted into the bush through a mounting hole opened in the radial direction, and the tip of the engaging piece is engaged with the male screw for feeding. The joint structure of the space truss according to claim 1, wherein the joint structure is compatible.