JPH07166604A - Joint structure of solid truss - Google Patents

Abstract

PURPOSE:To further simplify the structure of a joint to facilitate connection to a solid truss material and to provide the joint at a low cost. CONSTITUTION:In interjoining a joint body 1 and a truss member 5 by means of a bolt, a bolt 2 having an axis extending in the direction of the body is arranged rotatably around the end part of the truss member 5, and a feed ring 4 and a sleeve 3 are arranged around the bolt 2 between the body and the truss member. The sleeve 3 is connected to the bolt 2 axially movably and non-rotatably around an axis. The feed ring 4 has an opening larger than the outside diameter of the bolt 2 and is radially inserted from the outside and a feed pin 7 engageable with the root of the bolt is axially movably provided. An annular spring 8 to energize the feed pin to the central side of the feed ring is connected to the outer periphery of the feed ring.

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, if the plunger is a commercially available product, its specifications are limited, and it may not be possible to deal with the joint design depending on the size and load of the building. In this case, the plunger is custom-made, which further increases the cost.

The problem to be solved in the present invention is to provide a joint which can easily connect truss members with a simpler structure and at a low cost.

[0008]

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 by a bolt, and a bolt having an axis line oriented in the main body direction is rotatably attached to an end portion of the truss member. A feed ring and a sleeve are provided around the bolt between the 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, and the feed ring is provided with the bolt. Of the feed ring, which has an opening larger than the outer diameter of the feed ring and is inserted from the outside in the radial direction and is engageable with the valley of the bolt so as to be movable in the axial direction thereof. It is characterized in that an annular spring for urging toward the center of the feed ring is connected.

[0009]

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 opening of the feed ring into which the bolt is inserted is larger than the outer diameter of the bolt, the bolt faces the main body side of the joint with a free direction within a certain range such that the axis of the bolt is twisted. And
A feed pin that fits into the valley of the male thread of the bolt adds feed to the rotation provided by the sleeve, and the bolt advances while rotating toward the body of the joint. At this time, the feed pin is elastically biased by the annular spring and can be displaced in the axial direction, so that the engagement point with the male screw can be moved according to the posture of the bolt, and the bolt can be in any posture in the feed ring. It becomes possible to take

[0010]

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 and a bolt 2 around the bolt 2 are provided. A feed ring 4 for feeding the is arranged. Further, a bush 6 through which the bolt 2 is inserted is attached to an end portion of a truss member 5 such as upper and lower chord members and a steel pipe which is a diagonal member.

The bolt 2 is formed with a male screw 2a at the tip end side which is screwed into the female screw hole 1a, and the peripheral surface between the male screw 2a and the head 2b is shown in FIG. 2 (A-A line in FIG. 1). As shown in the vertical sectional view taken along the arrow), a groove 2c having a rectangular opening cross section is carved in the axial direction.

As shown in FIG. 2, the sleeve 3 has a hexagonal vertical cross section, and has a holding hole 3a through which the bolt 2 is inserted in the axial direction. The inner diameter of the holding hole 3a is the bolt 2
The main body of shall be slidable in the axial direction. Further, the sleeve 3 is provided with an engaging screw 3b which is inserted into the groove 2c of the bolt 2 by being screwed in from the outside in the radial direction. Then, when the bolt 2 is passed through the sleeve 3, the main body of the bolt 2 is slidably incorporated in the holding hole 3a, the engaging screw 3b is fitted in the groove 2c, and moves only in the axial direction. To do. Therefore, when a tool is put on the hexagonal outer circumference of the sleeve 3 and is rotated, the engaging screw 3b is engaged with the groove 2c, so that the bolt 2 integrally rotates.

The bush 6 is installed such that an opening 6a is opened in the axial direction so that the main body of the bolt 2 can slide, and the head 2b is located inside the truss member 5. Therefore, in actual assembly, the bolt 2 is passed through the opening 6a, and then the sleeve 3 is externally fitted to the bolt 2 and the engagement screw 3b is screwed into the bolt 2 to connect the bolt 2 and the sleeve 3 to each other. .

The feed ring 4 is a circular annular body as shown in FIG. 3 (a vertical sectional view taken along the line BB in FIG. 1),
The opening 4a through which the bolt 2 is inserted is opened in the axial direction. The inner diameter of the opening 4a is set so that the bolt 2 can freely receive the bolt 2 even when the bolt 2 is twisted to some extent. When the bolt 2 is rotated by the sleeve 3, the feed pin 7 and the annular spring 8 are provided as members for feeding the bolt 2 and screwing it into the female screw hole 1a.

FIG. 4 is a schematic perspective view showing the feed ring 4, the feed pin 7 and the annular spring 8 in a disassembled state.

The feed ring 4 is provided with a mounting hole 4b into which the feed pin 7 is inserted so as to extend radially to the opening 4a, and an annular spring 8 is dropped on the outer peripheral surface passing through the opening end of the mounting hole 4b. An integral holding groove 4c is provided by carving.

The feed pin 7 has a small flange 7 at one end thereof.
a is formed, and the tip is tapered so that it can be inserted into the valley of the male screw 2a of the bolt 2. As shown in FIG. 3, when it is inserted into the mounting hole 4b, the feed pin 7 is positioned so that the tip of the feed pin 7 does not abut the bottom of the trough of the male screw 2a. A receiving seat 4d for receiving is provided.

The annular spring 8 has, for example, a quadrangular cross section using a steel plate material as shown in FIG. 4 or a circular cross section using a steel wire material as shown in FIG.
The inner diameter in the natural state is slightly larger than the outer diameter of the holding groove 4c of the feed ring 4. With this slotted structure, the annular spring 8 can be deformed in the direction in which the radius expands and contracts. As shown in FIG.
When it is fitted in c, it is elastically deformed so that the inner diameter becomes slightly larger, and the restoring force thereof elastically restrains the holding groove 4c so that it is integrated with the feed ring 4 without falling off.

These sleeve 3 and feed ring 4 are
After the bolt 2 is passed through the opening 6a of the bush 6 and integrated, the bolts 2 are separately mounted from the male screw 2a side. And FIG.
The tip of the engaging screw 3b of the sleeve 3 fits into the groove 2c of the bolt 2 like the diagonal member at the lower left. Also, the feed ring 4
When the bolt 2 is inserted, the feed pin 7 moves outward due to elastic deformation of the annular spring 8 in the radial direction, and can be easily set.

After mounting the bolt 2, the sleeve 3 and the feed ring 4 on the truss member 5, connection work to the main body 1 is started. This 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 feed pin 7 of the feed ring 4 fits into the valley 2a-1 of the male screw 2a as shown in FIG. 5, the valley 2a-1 moves as guided by the feed pin 7. In addition to the rotation by the sleeve 3, the bolt 2 is also fed. Therefore, as the sleeve 3 rotates, the bolt 2 advances into the female screw hole 1a while rotating, and the bolt 2 can be screwed and connected to the female screw hole 1a like the horizontal member in FIG.

Here, since the inner diameter of the opening 4a of the feed ring 4 is such that the posture of the bolt 2 can be freely changed, the bolt 2 advances while having a play. The feed pin 7 is biased by the annular spring 8 in response to such movement, so that the sleeve 3 can be adjusted in accordance with the change in the posture of the bolt 2.
It becomes a movement to appear and disappear from. Therefore, the pointing direction of the tip of the bolt 2 inserted into the feed ring 4 not only coincides with the axis of the feed ring 4, but can be swung within a certain range, and the feed is surely given. Therefore, even if the axis of the truss member 5 does not exactly coincide with the female screw hole 1a of the main body 1, the female screw hole 1a receives this due to the change in the posture of the bolt 2, and the joining is easily started.

Then, when the sleeve 3 is further rotated,
The bolt 2 advances toward the main body 1, and finally the male screw 2a is screwed into the female screw hole 1a as in the horizontal member of FIG.
The head 2b of the bolt 2 comes into contact with the end surface of the bush 6. Then, using a tool such as a wrench, the sleeve 3
When further tightened, the truss member 5 is firmly connected to the main body 1.

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.

[0025]

According to the present invention, the feed ring for feeding the bolt has a play so that the bolt can be freely swung, and the degree of freedom is provided by the annular spring and the feed pin biased in the radial direction by the annular spring. It is designed to feed the bolt while maintaining. By swinging the bolt, the bolt can be easily aligned with the female screw hole of the joint when the bolt is joined to the joint body.

Further, since only the annular spring and the feed pin need to be provided in the feed ring, the cost can be greatly improved as compared with the conventional structure.

[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 vertical sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged vertical sectional view taken along the line BB of FIG.

FIG. 4 is a schematic perspective view showing a feed ring, a feed pin, and an annular spring in a disassembled state.

FIG. 5 is a vertical cross-sectional view of a main portion showing a connection relationship between a feed pin and a male screw of a bolt.

[Explanation of symbols]

 1 main body 2 bolt 2c groove 3 sleeve 3b engagement screw 4 feed ring 4b mounting hole 4c holding groove 4d receiving seat 5 truss member 6 bush 7 feed pin 7a flange 8 annular spring 8a notch

Claims (1)

[Claims] 1. A joint structure in which a main body of a joint and a truss member are joined by a bolt, and a bolt having an axis line oriented in the main body direction is rotatably provided at an end portion of the truss member, and the main body and the truss member are provided. And a feed ring and a sleeve are provided around the bolt, respectively, and the sleeve connects the bolt so as to be movable in the axial direction and non-rotatable about the axis, and the feed ring has an opening larger than the outer diameter of the bolt. At the same time, a feed pin, which is inserted from the outside in the radial direction and is engageable with the trough of the bolt, is provided so as to be movable in the axial direction thereof. The joint structure of the space truss that connects the energizing annular springs.