JP2821992B2 - Ball joint of space truss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of a ball joint of a space truss.

[0002]

2. Description of the Related Art Conventionally, as a ball joint of this type of space truss, a threaded hole formed at the center of an end cap provided at the end of a steel pipe, at least along a central axis of the steel pipe, and at least at a joint node. A bolt consisting of a male screw part to be screwed and a shaft part having a polygonal outer surface on which the socket is fitted is inserted and inserted, and a temporary pin longer than the outer diameter of the socket is inserted into a right-angled through hole provided in the bolt. Detachably insert and support,
The temporary pin is moved along a slit provided in the socket, and a ball joint of a space truss in which the bolt is screwed into the screw hole of the joint node at the initial stage, or a bolt head is pressed by an elastic body such as a spring. There has been proposed a ball joint of a space truss in which a bolt tip is urged in a screw hole direction of a joining node. (For example, Japanese Utility Model Laid-Open No. 59-194410, Japanese Utility Model Publication No. 1-24011, Japanese Utility Model Publication No. 4-1584)
No. 1, JP-A-57-107411, JP-A-5-107411
-102147 gazette)

In each of the above-mentioned prior art examples, initial screwing is possible by pushing a bolt in the direction of a joint node, but alignment between the bolt and the screw hole of the joint node does not rely on the visual inspection of an operator. There is an inconvenience that you do not get.

Further, as a conventional technique, there has been proposed a technique in which a bolt is tightened and screwed into a screw hole of a joining node, and then a means for preventing loosening or return of the bolt is provided. (For example,
Japanese Utility Model Laid-Open No. 61-123101, Japanese Utility Model 1-2040
No. 1)

According to the above-mentioned prior art, it is possible to prevent the joint node and the bolt from being loosened or returned, but as in the above-described case, the alignment between the bolt and the screw hole of the joint node is performed visually by an operator. There are inconveniences.

An object of the present invention is to provide a ball joint of a space truss in which a bolt and a screw hole are positioned by abutment of a chord member and a joining node, and an assembling effect can be improved.

[0007]

SUMMARY OF THE INVENTION The above-mentioned problems of the prior art
The present invention employs the following means to solve the problem.

An object of the present invention is to provide an end cap provided at an end of a steel pipe.
Align with the center axis of the steel pipe at the center of the
The rotation of the polygonal cylindrical socket
Insert a bolt that is screwed into the screw hole formed in the planar seating surface.
On the other hand, the screw hole
Two positioning projections equidistant from the center
The center of the screw hole and the positioning protrusion
Join the socket with the circular cylindrical part whose radius is the distance connecting
This is achieved by forming at the end on the node side.

The above object is achieved by providing an end cap provided at an end of a steel pipe.
Align with the center axis of the steel pipe at the center of the
The rotation of the polygonal cylindrical socket
Insert a bolt that is screwed into the screw hole formed in the planar seating surface.
On the other hand, the screw hole
Two positioning pins equidistant from the center can be moved in and out
And the two positioning pins are connected to the socket
To support different polygonal surfaces formed on the outer surface of
Is achieved.

An object of the present invention is to provide an end cap provided at an end of a steel pipe.
Align with the center axis of the steel pipe at the center of the
Spherical joint node by rotating polygonal cylindrical socket
Insert the bolt to be screwed into the screw hole formed in
On the other hand, the screw hole provided in the spherical joint node is
The bolt positioning step surface, which partially cuts the spherical surface of the joint node,
And the center of this screw hole.
A circular cylindrical portion whose radius is the distance connecting the positioning step surfaces,
The socket is formed at the joint node side end of the socket.
Is achieved.

The above object is achieved by a ball joint of a space truss according to claim 3.
The positioning step surface is formed in a straight line by hand.
Is achieved.

The above object is achieved by a space truss according to claim 3 or 4.
In the ball joint, the positioning step surface is concentric with the screw hole.
This is achieved by forming an arc-shaped concave step surface.

[0013] The above object is achieved by a ball joint of a space truss according to claim 3.
In the hand, position the positioning step surface, semicircular concentric with the screw hole
This is achieved by having a concave step surface.

[0014]

Next, the details of the embodiment of the present invention will be described with reference to the drawings.
explain. FIG. 1 shows a space truss as a base of the present invention.
A joint book that shows a ball joint and shows the state before joining the joint node
Partially cutaway side view of the body, FIG. 2 coupled to the junction node of FIG.
FIG. 3 is a partially cutaway side view of the joint main body showing a rear state.
FIG. 4 is a front view of a joint node seat surface showing the first embodiment, and FIG.
FIG. 5 is a longitudinal sectional side view of an essential part of FIG.
FIG. 6 is a front view of the arm seat surface, and FIG.
7 is a front view of a joint node seat surface showing a third embodiment, and FIG.
FIG. 9 is a front view of a joint node seat surface showing a fourth embodiment, and FIG.
FIG. 10 is a front view of a joint node seat surface showing an embodiment, and FIGS.
It is a vertical side view of the principal part of 5th Example.

FIGS. 1 and 2 show a three-dimensional structure on which the present invention is based.
Indicates a truss ball joint, which is attached to both ends of steel pipe 1.
The structure of the joint body A will be described.
The body A is configured as follows. That is, at both ends of the steel pipe 1
Hole provided at the center of end cap 2 to be fitted and welded
2a, along the central axis of the steel pipe 1 and at the joining node 3
The bolt 4 screwed into the screw hole 3a formed in the hole is movably inserted.
The end cap 2 has an outer surface diameter
The front shape passing through the center of the hole 2a is
A circular groove 2b is formed. The bolt 4 has a front
A head 4a abutting against the inner surface of the end cap 2, a circular shaft
Part 4b, this circular shaft part 4b and a polygonal shaft such as an octagon of approximately diameter
Part 4c, male screw part 4d smaller in diameter than polygon shaft part 4c.
Is formed . Also, the polygonal shaft portion 4 of the bolt 4
c and the end from the inner surface of the head 4a of the bolt 4.
Polygonal shaft part 4 of bolt 4 separated by the thickness of cap 2
c, drill through holes 5, 6 perpendicular to the axial direction of the bolt 4.
And the bolt 4 is finally tightened to the joint node 3.
In this state, a part of the one through hole 6 is
It is configured to fit into the concave groove 2b of the step 2. 7 is joining
Polygon shaft part of bolt 4 partly in unconnected state with node 3
4c is a socket fitted to the front end of the socket 7c.
Into the other end of the through hole 5 at the end on the end cap 2 side.
A slit 8 corresponding to and longer than the diameter of the through hole 5
Is formed in the through hole 5 through the slit 8.
Temporary pin 9 longer than the diameter of the socket 7 is detachably inserted and supported.
Let me know. In FIG. 1, let l ₁ = l ₂ , l ₃ <l ₄
It is a thing. The joint body A is configured as described above.
At the time of final tightening, the end cap 2
Concave groove 2b, through hole 4 of bolt 4 adapted to this,
FIG. 2 in which the slits 8 corresponding to the through holes 6 are commonly driven.
Is a combination of the detent pins 10 shown in FIG.
You. End cap of the joint body A thus configured
2 is welded to both ends of the steel pipe 1 and joined to the joining node 3
The string material or the diagonal material B is assembled and produced in a factory.

On the other hand, a chord member or a slant provided with the joint body A
The configuration of the joining node 3 corresponding to the material B will be described.
The screw hole 3 into which the male screw portion 4d of the bolt 4 is screwed.
a is formed on the planar bearing surface 3b of the junction node 3;
The seating surface 3b is positioned concentrically with the screw hole 3a.
The recess 3c is formed, and the socket 7
Circular cylindrical part that fits this positioning recess 3c
7a is formed.

[0017]

[Explanation of assembling action] String material produced as above
Or carry the diagonal material B, the pin 10 and the joint node 3 to the construction site
Then, assemble and join as follows. Joining as shown in Figure 1
Set node 3 on a gantry (not shown) and temporarily place chord B
I do. The position provided on the seating surface 3b of the socket 7 and the joining node 3
Circular cylinder of socket 7 in positioning recess 3c Adapt part 7a
The male screw 4d of the bolt 4 was aligned with the screw hole 3a.
After that, bolt 4 penetrates through slit 8 of socket 7
The temporary pin 9 inserted and supported in the hole 5 is manually inserted into the slit 8.
Rotate while moving along, and male screw 4d of bolt 4
Initial engagement between the tip and the screw hole 3a of the joining node 3 is performed.
After that, the temporary pin 9 is removed and the socket 7 is
The male screw 4d of the bolt 4 is connected by rotating with a jig.
Screw into the screw hole 3a of the joint node 3 and the head 4a of the bolt 4
Contacts with the inner surface of end cap 2 and rotates with bolt 4
The underground force increases and approaches a predetermined screwing amount. Socket 7
The other through hole 6 is visually observed from the slit 8 of FIG.
Turn the socket 7 further while checking again,
Groove 2b of cap 2, through hole 6 of bolt 4, and socket
The slits 8 of 7 are aligned. Then, as shown in FIG.
To the groove 2b, the through hole 6, and the slit 8 in common.
Driving the pin 10 for prevention
And the socket 7 are integrated to stop the bolt 4
Check the final tightening of the bolt.

Next, a second embodiment of the present invention based on the above-described configuration will be described.
The configuration of the first embodiment will be described with reference to FIGS.
The screw hole 3a formed on the planar seating surface 3b of the joining node 3
Two pieces equidistant from the center of the screw hole 3a on the lower left and right sides
The positioning projections 11 are provided at appropriate intervals.
Distance between the center of the screw hole 3a and the positioning protrusion 11
A circular cylindrical portion 7a having a radius of
It is formed at the end on the gate side.

[0019]

[Description of Assembly Operation] As shown in FIG.
Set oppositely on the gantry, the chord material between the joint nodes 3
Joints provided at both ends of string material B while lowering B in a horizontal position
The main body A is brought into contact with the opposing seat surface 3b
And the chord B is further lowered, the circular cylindrical portion 7 of the socket 7
a is placed on the two positioning protrusions 11 of the joint node 3
It is. At this time, the tip of the male screw portion 4d of the bolt 4 and the screw hole
3a is positioned on the same axis as the first embodiment.
The screw hole 3a of the bolt 4
The final tightening screw is made.

FIGS. 5 and 6 show the structure of the second embodiment of the present invention.
The configuration will be described. In this embodiment, the seating surface of the junction node 3 is shown.
On the left and right sides below the screw hole 3a formed in the screw hole 3b,
Two positioning screws 12 equidistant from the center are joined
Screw it into and out of the screw hole 13 provided in the node 3
And both positioning screw rods 12
A different polygonal surface 7b formed on the outer surface is abutted and supported.
is there. Incidentally, in this embodiment, two
Since the positioning screw 12 has a detent function,
The through hole 1 is provided only at the tip of the male screw 4 d constituting the bolt 4.
4 and a temporary pin 15 for pushing out the bolt 4 is inserted therein.
It is configured to be supported. In the figure, 16 is the socket 7
It is a slit provided at the end on the joining node side.

[0021]

[Description of Assembly Operation] As shown in FIG.
Set oppositely on the gantry, the chord material between the joint nodes 3
Joints provided at both ends of string material B while lowering B in a horizontal position
The main body A is brought into contact with the opposing seat surface 3b
And the string material B is further lowered.
Polygonal surfaces 7b are placed on two positioning screw rods 12, respectively.
Is done. At this time, the male screw 4d of the bolt 4 and the screw hole 3a
Are positioned on the same axis, and the temporary pin 15 is slit
16 to move the male screw 4d and the screw hole 3a to the initial position.
Let it bite. Next, a positioning screw is set with a jig (not shown).
The rods 12 are respectively inserted into the screw holes 13 and the sockets 7 are
When the bolt 4 is rotated and screwed into the screw hole 3a
In both cases, the posture of the socket 7 is indicated by a virtual line in FIG.
After the rotation adjustment, the positioning screw 12 is fixed with a jig.
And project it again to abut the polygonal surface 7b of the socket 7.
The return of the socket 7, that is, the bolt 4
It is designed to act as a stop. Other
Since the operation is the same as that of the first embodiment, a detailed explanation will be given.
Description is omitted.

Next, the details of the third embodiment of the present invention shown in FIG.
Will be described. This embodiment shows a part of the spherical joint node 17.
A plane having a stepped surface 18 for positioning the bolt 4 by cutting a spherical surface
A seat 17a is formed, and a bolt is attached to the flat seat 17a.
4 is formed with a screw hole 17b into which the male screw portion 4d is screwed.
First, the center of the screw hole 17b and the positioning step surface 18 are aligned.
The circular cylindrical portion 7c whose radius is the distance to be connected is
It is formed at the spherical joint node side end . Thus,
The positioning step surface 18 is in a horizontal posture as shown in FIG.
It is linear.

[0023]

[Explanation of the assembling operation] The spherical joint node 17 is mounted on a base.
The string material B is set between the spherical joint nodes 17 so as to face each other.
Joints provided at both ends of string material B while descending in horizontal posture
The body A is brought into contact with the facing seat surface 17a, and the chord material B is further lowered.
When lowered, the circular cylindrical portion 7c formed at the end of the socket 7 is straight
Is mounted and supported on the positioning step surface 18. At this time, screw hole 1
7b and the center of the male screw 4d of the bolt 4 are flush with each other.
On the surface. Then, the chord material B, that is, the socket 7 is horizontally moved.
When the center of the screw hole 17b and the center of the bolt 4 are matched while moving
At this point, the bolt 4 is moved by operating the temporary pin 9 and
The part 4d and the screw hole 17b are initially engaged. The rest is the first
The bolt 4 is screwed by operating in the same manner as in the embodiment.
The final tightening is performed in the hole 17b.

FIG . 8 shows a fourth embodiment of the present invention.
An example is the straight step surface 19 formed in the same manner as in the third embodiment.
And a concentric and arcuate position with the screw hole 17b.
The recessed step surface 19a is formed and the screw hole 17b is formed.
Circular cylinder whose radius is a straight line connecting the concave positioning step surfaces 19a
A portion 7d is formed at the spherical joint node side end of the socket 7.
It was done.

[0025]

[Description of Assembly Operation] Regarding the assembly operation of the fourth embodiment,
In other words, the spherical joint node 17 is opposed to the gantry.
The chord B is set horizontally between the spherical joint nodes 17
The joint body A provided at both ends of the string material B
Contact the seating surface 17a to face, and lower the chord material B further.
Positioning the circular cylindrical portion 7d formed at the end of the socket 7
By automatically fitting the screw hole 17b to the surface 19a,
The center and the center of the bolt 4 coincide. And the temporary pin 9
The bolt 4 is moved by the operation, and the male screw portion 4d and the
The holes 17b are initially engaged. Then, the operation of the first embodiment and
The bolt 4 is finally inserted into the screw hole 17b by the same operation.
Tighten the screws.

Next, referring to FIG. 9, a fifth embodiment of the present invention will be described in detail.
Details will be described. In this embodiment, the spherical joint node 17 is
It has the same width as the diameter of the circular cylindrical portion 7d formed on the ket 7.
The flat seating surface 20 is cut and the outer periphery of the screw hole 17b is formed.
A concentric circle with the screw hole 17b to which the circular cylindrical portion 7d fits in the lower part
In which a semicircular positioning concave step surface 20a is formed.
You.

[0027]

[Explanation of the assembling operation] The spherical joint node 17 is mounted on a base.
Oppositely set, between this spherical joint node 17 and chord material B
Joints provided at both ends of string material B while descending in horizontal posture
The body A is brought into contact with the facing seat surface 20 and the chord B is further lowered.
When descending, the circular cylinder 7d of the socket 7 automatically becomes semicircular.
It is guided and installed on the positioning concave step surface 20a. And the temporary pin
The bolt 4 is moved by the operation of Step 9 to
The holes 17b are initially engaged. The rest is the same as in the first embodiment.
The bolt 4 is screwed into the screw hole 17b by the final tightening operation.
Confuse.

As an embodiment of the present invention, a string material or a diagonal material B
The configuration of the joint body A is not limited to that shown in the figure.
No.

[0029]

According to the configuration of the present invention as described above,
The following effects can be obtained.

[0030] Bolts that make up the chord or diagonal joint body
And the screw hole formed in the joint node
Fitting body made automatically and without human intervention
Can support chords, string materials, diagonal materials and joint nodes.
That the efficiency of assembly in the factory can be improved rationally
In addition, the construction period can be greatly reduced.

[Brief description of the drawings]

FIG. 1 shows a ball joint of a space truss as a base of the present invention .
Of the joint body showing the state before joining to the joining node
It is a notch side view.

FIG. 2 is a joint showing a state after being joined to the joining node of FIG . 1;
It is a partially cutaway side view of a main body.

FIG. 3 shows a first embodiment of the ball joint of the space truss of the present invention .
FIG. 3 is a front view of a seat surface of a joint node .

FIG. 4 is a longitudinal sectional side view of a main part of FIG. 3;

FIG. 5 is a front view of a joint node seat surface showing a second embodiment.
is there.

6 is a vertical sectional side view of a main part of FIG. 5;

FIG. 7 is a front view of a joint node seat surface showing a third embodiment.
is there.

FIG. 8 is a front view of a joint node seat surface showing a fourth embodiment.
is there.

FIG. 9 is a front view of a joint node seat surface showing a fifth embodiment.
is there.

FIG. 10 is a longitudinal sectional side view of a main part of the third to fifth embodiments.
You.

[Explanation of symbols]

 Reference Signs List A joint body B chord or oblique material 1 steel pipe 2 end cap 3 joining node 3a screw hole 3b planar seating surface 4 bolt 7 socket 8 slit 11 positioning protrusion 12 positioning screw 14 through hole 15 temporary pin 16 slit 17 spherical joint node 17a Flat seat surface 18 Positioning step surface 19 Linear step surface 19a Concave step surface 20 Flat seat surface 20a Semicircular positioning concave step surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/19 E04B 1/58

Claims (6)

(57) [Claims] 1. A center of an end cap provided at an end of a steel pipe.
A polygonal cylinder that fits along the center axis of the steel pipe and fits
By turning the socket of the structure, it becomes a flat seat surface of the joint node
Insert the bolt to be screwed into the formed screw hole,
On the other hand, on the bearing surface of the joint node, from the center of the screw hole, etc.
Two positioning protrusions separated by a distance
The distance between the center of the screw hole and the positioning protrusion
With the circular cylindrical part whose radius is the joining node side end of the socket
Ball joint of a space truss characterized by being formed in a part. 2. The center of an end cap provided at an end of a steel pipe.
A polygonal cylinder that fits along the center axis of the steel pipe and fits
By turning the socket of the structure, it becomes a flat seat surface of the joint node
Insert the bolt to be screwed into the formed screw hole,
On the other hand, on the bearing surface of the joint node, from the center of the screw hole, etc.
If two locating pins that are far apart are provided
In both cases, these two positioning pins are formed on the outer surface of the socket.
It is specially designed to support different polygonal surfaces
The ball joint of the space truss to be the symbol. 3. The center of an end cap provided at an end of a steel pipe.
A polygonal cylinder that fits along the center axis of the steel pipe and fits
Formed into a spherical joint node by rotating the socket of the structure
Insert the bolt to be screwed into the screw hole,
The screw hole provided at the spherical joint node is
Planar seat with stepped surface for positioning bolts with cut partial spherical surfaces
And the center of this screw hole and the positioning
Insert the circular cylindrical part whose radius is the distance connecting the step surfaces into the socket
Formed at the junction node side end of
Ruth ball joint. 4. The ball joint of the three-dimensional truss according to claim 3.
The positioning step surface is formed in a straight line
Ball joint of space truss. 5. A ball joint for a space truss according to claim 3 or 4.
In this case, the positioning step surface is an arc-shaped concave step concentric with the screw hole.
A ball joint of a space truss characterized by a surface. 6. The ball joint of the space truss according to claim 3.
The positioning step surface with a semicircular concave step surface concentric with the screw hole.
Ball joint of a space truss characterized by the following.