JPS6113009A - Connection of steel pipe structural member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for joining steel pipe structural members of a plane truss and a three-dimensional truss, which are formed by joining a plurality of steel pipe structural members such as circular pipes and square pipes via node members. Regarding.

Conventional technology Traditionally, the nodes of steel pipe truss were commonly joined by welding, but as it has become difficult to find welders on-site and wages are rising, inspections are becoming more and more important in order to maintain quality. In recent years, trusses using bolted joints using joint members have rapidly become popular due to the dislike of difficult on-site welding and the trend toward higher-grade galvanized structures that require no maintenance. .

To explain a typical known node structure of the bolt joint method, in the one shown in FIG. A hole 14 through which a bolt 1.3 passes is bored at the position, a screw hole 16 is provided in an end cap 15 attached by welding to the tip of the steel pipe structural member 1, and a high-strength bolt 13 is inserted from inside the node member 11. The high-strength bolts 13 are screwed into the threaded holes 16 of the end caps 15 and then tightened to connect them. In order to do this, it is necessary to provide a large hole 17 above and below the node member 11 through which a torque wrench can be inserted and rotated within a certain range of angles. Due to the large size, it is necessary to increase the rigidity of the ring, which increases the plate thickness and weight, which not only increases cost, but also makes workability worse because the joint members are heavy.Furthermore, the joint members are large. is not aesthetically pleasing.

Further, in the example of the conventional bolted joint node structure shown in FIG. 4, the node member 21 is a solid steel ball provided with a screw hole 24 into which a connecting bolt 23 of a steel pipe structural member 22 is screwed from the outside. On the other hand, an end cap 25 is welded to the tip of the steel pipe structural member 22, and a joint bolt 23 with an enlarged head is inserted from inside the steel pipe structural member 22 through a through hole provided therein, and has a hexagonal cross section. After passing through the socket 26, it is screwed into the screw hole 24 of the node member 21. In order to insert the bolt 23 into the galvanized steel pipe 22, a large circular or oval assembly hole I is bored in the wall of the steel pipe. The socket 26 is provided with an elongated hole 26a in the axial direction, and a pin 28 is driven into the hole drilled in the bolt 23 in a direction perpendicular to the axis through the hole 26a, and the socket 26 is rotated with a torque wrench. bolt 2
3 is rotated and screwed into the screw hole of the node member 21 to join.

In this method, the high-strength bolt has a hole for inserting the bottle perpendicular to the bolt axis, so the bolt has a defective cross section, which reduces its strength and is not economically advisable.

Furthermore, in this method, a large hole 27 for inserting the high-strength bolt 23 is drilled in the wall of the steel pipe structural member, which causes a large loss in the cross-sectional area of the steel pipe, reducing its strength, and is not economically advisable. . In addition, the large holes drilled in the tube wall have the disadvantage of detracting from the aesthetics.

It is an object of the present invention to provide a method for joining steel pipe structural members that has good workability, does not cause cross-sectional defects in steel pipes, and is excellent in terms of cost, appearance, and workability.

Means for Solving the Problems In the method of joining steel pipe structural members according to the present invention which solves the above-mentioned problems, each steel pipe structural member constituting a steel pipe truss is attached to end caps fixed to both ends thereof with screws in opposite directions. The joint member is constructed as a hollow spherical member with a maintenance hole and a through hole with a diameter slightly larger than the outer diameter of the joint bolt at the joint position of each steel pipe structural member. When joining each steel pipe structure member, an enlarged head having a thread direction and a thread diameter that matches the threaded hole provided in the end cap of the steel pipe structure in the through hole corresponding to the steel pipe structure of the node member to which both ends are attached. After inserting the attached bolt from the inside of the node member through a means that creates appropriate friction between the lower part of the neck and the through hole, and screwing it into the screw on the end cap side, the steel pipe structural member is inserted. Rotate around the axis, thread the screws on the end cap side and the screws of the high-strength bolt at both ends at the same time, press the back of the enlarged head of the high-strength bolt against the inner surface of the node member, and then The method for joining steel pipe structural members according to the present invention is characterized in that the end face of the cap is brought into pressure contact with the outer surface of the node member to generate tension and fix the high-strength bolt. Insert the high-strength bolt with an enlarged head that connects the member and the node member through the hand hole of the node member, insert it into the through hole corresponding to the steel pipe structural member to be joined, and insert it into the screw hole provided in the end cap. Rotate as much as you can. After joining both ends of the steel pipe structural member as described above and engaging the high-strength bolts and screws, if the steel pipe structural member is rotated around its axis with a pipe wrench, the high-strength bolts at both ends will be connected to the lower part of the neck. Relative rotation between the nodal member and the bolt is restrained by means of applying friction provided between the through hole and the bolt is screwed into the threaded hole provided in the end cap, and finally the enlarged head of the high strength bolt is screwed into the bolt. The back surface comes into pressure contact with the inner surface of the node member, and the end cap's female threaded surface comes into pressure contact and is securely fixed.

Therefore, there is no need to provide large round holes or long holes in the walls of steel pipe structural members into which high-strength joint bolts can be inserted, and there is no need to insert a torque wrench into the joint members to rotate the bolts. The maintenance hole provided in the node member can be small, and the inner diameter of the node member itself can also be small. Therefore, it is advantageous in terms of strength, may be thin in wall thickness, is small and lightweight, and is advantageous in terms of workability and aesthetics. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing two embodiments of the node portions of a steel pipe truss to which the joining method of the present invention is applied. The 0-node member l connects the maintenance hole 2 and the steel pipe structural members 3 such as chord members and diagonal members. It is constructed as a squirt-like hollow spherical member provided with a through hole 5 through which a connecting high-strength bolt 4 passes.

FIG. 1 is a sectional view showing a part thereof in detail.

End caps 6 are fixed to both ends of the steel pipe structural member 3 by butt welding, and the end caps 6 at both ends are provided with screw holes 7 having left and right threads cut in opposite directions. It will be convenient for the work if the end cap is placed in an easily visible position so that the direction of the thread in the screw hole can be determined at a glance using a symbol such as R. The diameter of the bolt through hole 5 drilled in the node member 1 is larger than the outer diameter of the lower part of the neck of the high strength bolt 4 with an enlarged head that is screwed into the screw hole 7. A flexible ring 8 of suitable hardness is wound around the outer peripheral surface of the lower part of the neck of the tall bolt 4 and is slightly thicker than the thickness of the gap between the outer peripheral surface and the inner surface of the through hole 5.

The high-strength bolt 4 has a thread cut in the same direction as the thread provided on the end cap 6, and is engraved with a symbol such as R on its head so that the direction of the thread can be seen at a glance. ing.

Further, the top surface of the enlarged head of this screw is provided with an appropriate groove 9 such as a square, hexagonal, cross-shaped groove, or a slotted groove into which the tip of a rotary tool (driver) can engage. There is.

When installing the steel pipe structural member 3, insert the high-strength bolt 4 through the through hole 5 corresponding to the steel pipe structural member in the node member 1 at both ends of the steel pipe, and engage it with the screw in the screw hole 7 provided in the end cap 6. let For this rotation, a small electric or air-driven corner work driver may be engaged with a retaining groove on the top surface of the enlarged head of the high-strength bolt 4 and rotated.

Although this rotation does not fully tighten the bolt, it does not require a large amount of driving force, and the screwdriver for corner work can be small, and there is no need to swing the screwdriver itself around the bolt, so it is easy to drill holes. 2 may be small, and the inner diameter of the node member may be small.

When the high-strength port 4 is screwed into the screw 7 of the end cap 6 through the through hole 5, the flexible ring 8 is pushed into the gap between the through hole and the bolt outer surface, which is slightly thinner than the thickness of the flexible ring 8, and due to elastic deformation, A frictional force is generated between the inner surface of the through hole,
Also, since the bolt is allowed to swing to some extent, the axis of the bolt and the axis of the threaded hole in the end cap are automatically adjusted. The material of the flexible ring 8 may be hard rubber, flexible plastic, etc. flexible materials can be used. Note that the insertion side end of the through hole 5 may be chamfered appropriately so that the flexible ring 8 can be easily press-fitted.

After the bolts are engaged with the threaded holes in the end caps 6 at both ends, when the steel pipe structural member 3 is rotated around its axis using a pipe wrench with torque control, the high-strength bolt 4 is inserted into the flexible ring 8. Due to the friction between the through hole 5 of the nodal member 1 and the nodal member 1, the bolt is screwed into the screw hole 7 of the end cap 6 without relative rotation with the nodal member 1, and finally the back side of the enlarged head of the high-strength bolt is in pressure contact with the inner surface of the node member 1, and the end surface of the end cap 6 is in pressure contact with the outer surface of the contact member 1. In this state, the threaded surface of the high-strength bolt and the threaded surface of the end cap come into pressure contact, providing a locking effect and fixing the end cap. However, in order to make the tightening work easier during the tightening process, it is preferable to provide a means to reduce friction between the end face of the end cap 6 and the outer surface of the node member 1 that comes into contact with the rib. As a means for this, a method of applying a known anti-friction agent, a method of inserting a washer coated with an anti-friction agent, etc. can be adopted.

The dimensional accuracy of the steel pipe truss to which the present invention is applied is well controlled at the time of factory manufacturing, and the tip of the end cap is machine-finished so that it forms a surface perpendicular to the pipe axis, and the dimensional accuracy of the nodal members is also It also needs to be strictly controlled. If the members whose dimensional accuracy is strictly controlled in this way are delivered to the site and assembled according to the manual using the joining method of the present invention with the truss components as the opposite, the precision can be achieved without the need for highly specialized technicians. A high steel pipe truss can be completed.

According to the method of the present invention, the component parts are made of a single material, and the transportation block is also small and compact, resulting in lower transportation costs. Since the joints are bolted together, disassembly is easy, and it can also be applied to temporary buildings.

The nodal member according to the present invention is small and lightweight, has good workability, and is also aesthetically advantageous since there is no need to drill large holes in the wall surface of the steel pipe for inserting bolts.

In addition, not only a circular pipe but also a square pipe or the like can be used as the steel pipe structural member.

It is also effective to use a high-strength bolt with a locking ring installed on the bolt in advance to further prevent the bolt from loosening when the connection is complete.

In addition, as a measure to prevent bolts from loosening, end caps 6
A hole (indicated by 10 in Figs. 1 and 2) is made in the side wall of the bolt, an adhesive is inserted through this hole, and the gap between the screws of the high-strength bolt 4 and the end cap 6 is filled with the adhesive. It is also effective to do so.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing in detail a part of a node of a steel pipe truss to which the method of the present invention is applied, Fig. 2 is a side view showing a partial cross section showing the entirety of one joint, and Fig. 3 ( → is a sectional view showing an example of a conventional steel pipe truss node structure, (b) is a top view thereof, and FIG. 4 is a side view including a cross section showing an example of another conventional node structure. 1... Node Member 2... Maintenance hole 3... Steel pipe structural member 4... Connection bolt 5... Through hole
6... End cap 7... Screw hole 8... Flexible ring (means for applying friction) 9...
Driver retaining groove lO...-Adhesive injection hole Fig. 1 Maintenance hole Steel pipe structural member Fig. 2 Fig. N3 (a) (b)

Claims (5)

[Claims] (1) In a steel pipe structural member joining method for a steel pipe truss in which multiple steel pipe structural members are joined via node members, each steel pipe structural member has screw holes threaded in opposite left and right directions in the end cap fixed to both ends of the steel pipe structural member. The joint member is constructed as a hollow spherical member with a maintenance hole and a through hole with a diameter slightly larger than the shaft outer diameter of the joint high-strength bolt at the joining position of each steel pipe structural member. When joining structural members, the thread direction and diameter that match the threaded hole provided in the end cap of the steel pipe structural member at the corresponding end of the steel pipe structural member are set in the through hole corresponding to the steel pipe structural member of the node member to which both ends are attached. After inserting a high-strength bolt with an enlarged head from the inside of the node member through a means that creates appropriate friction between the lower part of the neck and the through hole, and screwing it into the screw on the end cap side, Rotating the steel pipe structural member around its axis, simultaneously completely screwing together the screws on the end cap side and the screws of the bolts at both ends to prevent loosening;
Pressing the back of the enlarged head of the bolt against the inner surface of the node member,
A joining method characterized by generating tension in a high-strength bolt to press the end face of an end cap against the outer surface of a node member and fixing the end cap. (2) The means for creating friction between the high-strength bolt and the through hole of the node member has an outer diameter slightly larger than the diameter of the through hole wrapped around the lower neck of the bolt, 2. The joining method according to claim 1, wherein the joining method is a ring-shaped member made of a flexible material. (3) A screwdriver engagement groove is provided on the top surface of the enlarged head of the bolt, and the threading of the bolt thread and the end cap screw, which is performed prior to rotation of the steel pipe structural member, is a corner work. 2. The joining method according to claim 1, wherein the joining method is carried out by engaging a driver in the groove. (4) The joining method according to claim 1, wherein means for reducing friction is applied to the end face of the end cap and the portion of the outer surface of the node member that comes into contact with the end face of the end cap. (5) As a measure to prevent the above bolts from loosening, it is recommended to make a hole in the side wall of the end cap, insert adhesive material through this hole, and fill the gap between the high-strength bolt and each screw of the end cap with the adhesive material. A joining method according to claim 1, characterized in that: