JP2989928B2 - Space truss joint structure - Google Patents

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 chords and diagonal members in a three-dimensional truss for constructing a bridge or a roof of a building structure.

[0002]

2. Description of the Related Art Conventionally, as a truss structure constructed on a roof of a bridge or a building, pipe materials are used as an upper chord material, a lower chord material, and a diagonal material in order to reduce weight and improve strength of members. Became. Connection of each material using this pipe is generally performed using a node or a dedicated base. When a node is used, a construction method is adopted in which a high-tensile bolt or the like is provided at the end of the pipe and this is screwed into the node to construct a truss.

In addition, a structure in which a base is formed of a thick steel plate and a tip of a pipe is connected to the base by bolts instead of a dedicated member such as a node is widely used because the connection operation is relatively simple. ing. In this connection structure,
The end of the pipe is crushed flat to form a flange, and a bolt hole is formed in the flange, and the connection structure is fastened to the base with bolts and nuts.

[0004]

However, when constructing a truss, the upper and lower chords and diagonal members are intensively connected to the base. Positioning is quite difficult. For example,
When the support point on the base side is rigidly fixed, when connecting a plurality of truss members, the posture of the base is also determined by the member connected first. For this reason, since the position of the base is fixed by the truss member connected first and there is no degree of freedom, it is considerably difficult to assemble the truss member to be connected later.

In order to solve such a problem, the applicant of the present invention has proposed a structure of a space truss which facilitates the connection of a diagonal member which requires a particularly complicated connection with the base side in Japanese Patent Application No. 63-137679. In this technique, a joiner is provided so as to have a degree of freedom with respect to the base, thereby facilitating connection of diagonal members and improving workability.

However, in order to fix a horizontal member such as an upper chord or a lower chord to a base, an L-shaped angle or the like is used. And, in order to connect the joiner to the base, it is necessary to make this angle a hollow structure so that the plane becomes a square, and the strength of the bottom part that fixes the angle to the base can be maintained, but the strength of the raised part is small. Therefore, in such a structure, the connection of the string members and the connection of the diagonal members are hindered, and it is necessary to rework the truss after constructing the entire truss.

An object of the present invention is to provide a three-dimensional truss which can easily connect the upper and lower chords and diagonal members to the base and has sufficient strength.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a three-dimensional truss joint structure for concentratingly connecting upper and lower chords and diagonals having flat joints, and supports a flat portion of an upper chord or lower chord. A flat base, a fixing flange for fixing the flat portion between the base and the fixing flange, and a liner block fixed to a joint end of the upper chord material or the lower chord material in a posture substantially orthogonal to the support surface of the base. And a cylindrical coupling block which is integrated with the base and in which the liner block abuts on a peripheral surface and is connected by a fixing bolt passing through the liner block.

An opening having an inner diameter smaller than that of the coupling block is formed in the base substantially coaxially with the coupling block, and a projection which fits in the opening and a flange connected to the joint surface with the base at the joint end of the diagonal member. A joining pin having a circular cross section formed at one end may be provided, and the joining pin may be restrained and fixed to the base side.

[0010]

The liner block provided at the joint end of the upper chord material or the lower chord material sandwiched between the base and the fixed flange abuts on the peripheral surface of the cylindrical coupling block provided on the base, and the liner block is moved in the axial direction of the coupling block. It makes line contact with its peripheral surface in parallel. For this reason, the upper chord material or the lower chord material has a degree of freedom around the connection block. Therefore, when joining the upper and lower chords to the base, temporarily tighten the fixing bolts connecting the liner block to the connecting block, and even if the posture of each chord is not appropriate, this can be absorbed. The strings can be connected by finally joining the fixing bolt and the connecting block. Also, the liner block provided at the joint end of the upper chord material or the lower chord material hits the peripheral surface of the joint block, so that the joint end of each upper chord material or lower chord material can have a solid structure via the joint block. Also, the strength of the joint end can be improved.

Further, since the joining pin provided at the joining end of the oblique material has a circular cross section, if the joining pin is applied to the peripheral surface of a rod, a bolt, or the like provided on the base side, the oblique material will It is possible to swing around the joint pin. Therefore,
Highly flexible construction can be performed in the same way as the construction of chord materials.

[0012]

FIG. 1 is a longitudinal sectional view of a joint structure showing one embodiment of the present invention, and FIG. 2 is a plan view thereof.

In FIG. 1, four upper chord members 2 and four diagonal members 3 are connected using a flat base 1. The upper chord 2 and the diagonal 3 are respectively a base 1
And are integrally connected by a fixed flange 4 which is paired.
The base 1 and the fixing flange 4 have a regular octagonal planar shape as shown in FIG. As shown in FIG. 3, openings 1a,
4a, and bolt holes 1b, 4 for passing fastening bolts 5 around these openings 1a, 4a.
b is provided.

FIG. 4 shows the structure of the end of the upper chord 2. As shown in the figure, the upper chord material 2 is made of a pipe material having an appropriate thickness, and a reinforcing sleeve 6 is inserted into the end of the upper chord material 2 as shown in FIG. It has a structure in which the ends are pressed flat as shown. Reinforcement sleeve 6
Is composed of a plate 6a bent so as to have an outer diameter enough to fit tightly into the upper chord material 2, and a circular block 6b integrated with one end of the plate 6a by welding. Then, the reinforcing sleeve 6 is inserted into the upper chord 2 and the ends thereof are aligned, and as shown in FIG. 3B, the end side avoiding the block 6b is pressed flat. After this press, two holes 7 matching the bolt holes 1b, 4b of the base 1 and the fixing flange 4 are opened. Further, the liner block 8 is fixed to the pressed end face by welding so as to be orthogonal to the axis of the upper chord material 2. The liner block 8 is a flat plate having a hole 8a. As shown in FIG.
a, and are assembled so that a square cavity is formed by these four liner blocks 8.

FIG. 5 is a cross-sectional view of a main part showing a structure of assembling the diagonal members 3 into the base 1, and FIG. 6 is a bottom view when four diagonal members 3 are combined.

The tip of the diagonal member 3 is formed to have two sides orthogonal to each other, one side of which is integrated with a flange 9 by welding, and the other side having an axis perpendicular to the surface of the flange 9. The joining pin 10 is similarly fixed by welding. The flange 9 is the base 1 when these four pieces are put together.
And a bolt hole 9a for passing the bolt 5 in two places. The joining pin 10 has a circular cross section longer than the welded portion with the diagonal member 3, and has a projection 10a having a smaller outer diameter formed at the upper end thereof. When the four flanges 9 are abutted, each of the joining pins 1
The zero core is located on a common circumference, and is assembled with the four protrusions 10a accommodated in the opening 1a of the base 1.

Further, on the base 1, a connecting block 11 for connecting the upper chord 2 and the diagonal 3 is incorporated.
The connection block 11 is fixed to the base 1 by welding in advance, or is attached so as to be integrated during construction. Then, as shown in FIGS. 1 and 2,
The connecting block 11 has a cylindrical shape having an outer diameter larger than the opening 1a of the base 1 and has bolt holes 11a for attaching four upper chords 2 in the radial direction, and further connects the diagonal members 3 in the axial direction. A through hole 11b through which a connecting bolt 12 is inserted is formed. The bolt holes 11a are provided so as to be aligned with the holes 8a of the liner block 8 integrated with the upper chord material 2, and the fixing bolts 13 passed through the holes 8a are screwed into the bolt holes 11a, so that the upper chord material 2 and the coupling block 11 are formed. Are integrated. When the upper chord members 2 are joined, the outer peripheral surface of the joining block 11 forms an inscribed circle with respect to the four liner blocks 8 which are located on four sides and form a substantially square space.

The connecting bolt 12 has a length which penetrates through the insertion hole 11b of the connecting block 11 and slightly projects from the lower end of the joining pin 10 integrated with the diagonal member 3, as shown in FIG. At the lower end of the connecting bolt 11, a holding ring 14 for supporting the lower ends of the four joining pins 10 so as to wrap the lower end thereof.
The joint pin 10 is restrained and fixed to the base 1 side by tightening the nut 11a.

In the above configuration, the truss is constructed in the following manner. As a construction procedure, there are a case where the upper chord material 2 is connected first and the diagonal material 3 is connected after that, and a case where the diagonal material 3 is connected in the reverse order. Here, the former will be described.

First, the liner blocks 8 provided at the tips of the upper chord members 2 are connected to the connecting blocks 11 by fixing bolts 13, respectively. Then, the base 1 and the fixed flange 4
At the same time, the liner block 8 is passed through the opening 4 a of the fixing flange 4,
Of the connecting pin 10 into the opening 1a of the base 1. Next, the bolt 5 is passed through the bolt hole 9a of the flange 9 of the oblique member 3, and the bolt hole 1b of the base 1 and the upper chord member 2
The nut 5a is loosely screwed through the hole 7 and the bolt 4b of the fixing flange 4.

In the work so far, since the liner block 8 is in line contact with the outer peripheral surface of the cylindrical coupling block 11 and the bolt 5 is also in a temporarily tightened state, the upper chord 2 has a degree of freedom around the coupling block 11. Become. For this reason, the upper chord 2 is maintained in a state in which the upper chord 2 is easily swung by the butting of the liner block 8 and the coupling block 11. Therefore, in the operation of connecting the upper chord member 2 to the base 1, even if the upper chord member 2 is displaced, the connection to the base 1 can be performed by absorbing the displacement around the coupling block 11. Also, 4
The joining pin 10 of the diagonal member 3 is restrained to the base 1 by a connecting bolt 12 passed through an insertion hole 11b of the connecting block 11 and a nut 12a screwed into the connecting bolt. At this time, if the nut 5a is loosely screwed and temporarily tightened, the lower end of the joining pin 10 is only restrained by the holding ring 14, so that the peripheral surface of the joining pin 10 is in line contact with the peripheral surface of the connecting bolt 12. However, the swinging operation of the oblique member 3 can be performed as in the case of the connection of the upper chord member 2. For this reason, even when there is a displacement between the diagonal member 2 and the base 1 side, the connecting operation can be performed by absorbing the displacement.

By temporarily fixing the upper chord 2 and the diagonal 3 to the base 1 side, the positions and postures of the upper chord 2 and the diagonal 3 are adjusted, and the upper chord 2 between the other nodes is adjusted. It can absorb camber deflection and construction error between the material and the slant. After that, if the fixing bolt 13 is tightened up and the nut 12a is fully tightened to the connecting bolt 12, the upper chord member 2 and the diagonal member 3 are connected and constructed via the base 1 and the connecting block 11.

As described above, the degree of freedom in connecting the upper chord member 2 and the diagonal member 3 is large, and even if the posture of the diagonal member 3 cannot be properly taken, the connecting operation can be performed without difficulty. In addition, since the liner block 8 is provided at the tip of the upper chord material 2 and abuts against the peripheral surface of the cylindrical coupling block 11 on the base 1 side,
The torsion of each upper chord 2 with respect to the base 1 can also be absorbed. Therefore, even if the posture of the upper chord member 2 and the slant member 3 is not appropriate due to a construction error, a defective work procedure, or the like, it is not necessary to join the upper chord member 2 and the slant member 3 with an excessive force.

Further, since the upper chord 2 is not supported only by the flat base but the connecting block 11 against which the liner block 8 abuts is provided, the connecting block 11 receives the compression of the upper chord 2. Become. Therefore, the shear load on the bolt 5 is reduced, and the deformation of the base 1 is suppressed, so that the influence on the diagonal member 3 can be eliminated.

In the above embodiment, the structure in which the upper chord material and the diagonal material are connected to the base is shown. However, the structure of the lower chord material and the base for connecting the same are exactly the same.

[0026]

According to the present invention, since the liner block provided at the joint end of the upper chord material or the lower chord material hits the peripheral surface of the cylindrical coupling pin provided on the base, the upper chord material and the lower chord material are temporarily fixed to the base. By doing so, it is possible to join while adjusting the position of each chord material even if the chord material attitude does not match the base. Also, since the diagonal material has a joining pin with a circular cross section,
As with the chord material, the diagonal material can have a degree of freedom around the joining pin. Therefore, the joining operation of the upper chord material, the lower chord material and the oblique material is simplified, and the work load is reduced.
Furthermore, since the liner block at the joint end of each upper chord material or lower chord material hits the joint block on the base side, the compressive force in the axial direction of each chord material can be received by the joint block, and a hollow using a conventional angle is used. The strength is improved as compared with the structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint structure showing one embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an exploded cross-sectional view for explaining connection of an upper chord member to a base side.

FIG. 4 is a diagram showing a reinforcing structure of a tip portion of an upper chord material and an attachment of a liner block.

FIG. 5 is an exploded cross-sectional view showing connection of a diagonal member to a base side.

FIG. 6 is a bottom view of a main part showing a state in which respective flanges of four diagonal members are arranged so as to face each other. Reference Signs List 1 base 2 upper chord material 3 diagonal material 4 fixing flange 5 bolt 6 reinforcing sleeve 7 hole 8 liner block 9 flange 10 connecting pin 11 connecting block 12 connecting bolt 13 fixing bolt 14 holding ring

Continuation of front page (56) References JP-A-4-102645 (JP, A) JP-A-2-24426 (JP, A) JP-A-2-16231 (JP, A) JP-A-1-310031 (JP) JP-A-63-89744 (JP, A) JP-A-59-192501 (JP, U) JP-T2-500457 (JP, A) JP-T-60-502111 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/58 E04B 1/19

Claims (2)

(57) [Claims] 1. A three-dimensional truss joint structure for concentratingly connecting upper and lower chords and diagonals having flat joint ends, wherein the flat base supports a flat portion of an upper chord or a lower chord; A fixing flange for fixing a flat portion between the base and the base, a liner block fixed to a joint end of the upper chord material or the lower chord material in a position substantially orthogonal to a support surface of the base, and integrated with the base; A joint structure for a space truss, comprising: a cylindrical coupling block which is in contact with a peripheral surface of the liner block and is connected by a fixing bolt passed through the liner block. 2. The joint structure according to claim 1, wherein an opening having an inner diameter smaller than that of the connection block is opened substantially coaxially with the connection block in the base, and a connection end of the diagonal member is connected to the base. A joint for a three-dimensional truss, comprising: a flange connected to a joint surface and a joint pin having a circular cross section formed at one end with a projection that fits into the opening, and the joint pin can be restrained and fixed to a base side. Construction.