JP5411232B2 - Coaxial joining system - Google Patents

Description

  The present invention relates to a structural joining system that provides a moment resistance function and does not use welding. Its application is in all areas of architectural design, engineering, production and on-site construction of reticulated structures using circular pipe members.

In general, a network is made up of a network of two basic structural elements, nodes and interconnecting linear elements. When the linear element is a cylindrical tube, the joint with the node is usually a pin joint in terms of the form of the joint mechanism.
Systems that use pinned connection networks are widely used in the architectural design, engineering, fabrication, and field building of numerous reticulated structures such as: The network includes, but is not limited to, dome, building facade, tower, stadium cover, bridge, and various truss applications.

  In general, typical pin joint systems employ generally spherical nodes joined to a number of tubular frame members. The nodes have openings for receiving parts, such as bolts, joint assemblies, and the ends of the tubular frame material are welded to other parts, such as end cones in the joint assembly. The ends of the tubular frame material may be tapered for the purpose of simplifying or strengthening the joint. By joining each ball node to a number of tubular frame members using a bonding assembly, the network of nodes and frame members can be expanded and interconnected, thereby forming a network. Many variations of this common "tube and ball nodal system" employ nodes that are attached to a planar joining assembly to which the tubular frame material is directly welded.

  One type of tube and ball nodal system uses a ball node with a number of round openings to insert and secure bolts or pins. A funnel-shaped sleeve having a hollow cylindrical base is disposed between the ball node and the hollow cylindrical frame material. The ends of the frame material are appropriately tapered to match the funnel shape at the sleeve tip. The tapered end of the frame material and the sleeve tip are welded to each other, and bolts are inserted through the frame material, inserted through the sleeve base, and fixed by screwing into the nodes. It is done. An externally attachable collar that can be fixed to the bolt while turning is provided for tightening the bolt. In this way, the frame members are individually attached to the ball nodes to form a network structure. In these configurations, shear, tensile and compressive stresses are generated by the bolt. In some cases, the collar creates a compressive stress. Bolts generally work well for pulling, but are problematic for shear and compression.

  A system using a pinned connection network can be employed in a reticulated structure in various ways. These ranges of use range from those that act primarily as structures that carry the load to those that give the aesthetics of the building front. The purpose of the network structure determines what compressive forces and tensions are applied to the system. The network is designed to withstand the calculated compressive force and the magnitude and direction of tension. To design such a network effectively, it is necessary to develop an appropriate model of the pin joint system employed in the structural design. Desirably, the model should be as simple as possible without compromising engineering accuracy. Moreover, when a cylindrical frame material is employed, the joint system to be used should optimize the compressive force load characteristics as a common matter for the cylindrical tube.

  A typical tube and ball nodal system has several deficiencies that become apparent when designing, engineering, fabricating, and building a network. In a standard tube and ball nodal system, the junction between each member-node is typically modeled as the following three member system. The three members consist of a hinge at the node, a short flexible material representing the bolt, and a tube. Since the frame material is often tapered and welded to the funnel sleeve, which is then joined to the node, there is a moment at the joint between the members and the joint, so the three-member model has sufficient accuracy It is required to measure it. The three part model achieves the accuracy needed to incorporate short flexible material and hinges. The three member model is problematic because it introduces complexity in the design of the mesh structure.

  In order to use a simpler model, a short flexible material representative of bolts and / or a hinged collar can be omitted, so that it is virtually moment resistant at the joint between the frame material and the node. A structure with However, tube and ball nodal systems cannot withstand moments well at the joints. This is because current designs require the frame material to taper towards one sleeve, collar and bolt. Decreasing the frame material cross-section at the junction will introduce additional structural elements that are modeled as hinges into the design, and as a result typically impedes moment transfer at the junction. In this way, a slight rotation occurs in the connection with the pin under load. The same applies to short flexible materials that cannot be moment transferred. This prevents the frame material from being loaded, and therefore loud loudspeakers, lightweight assemblies, and other equipment must be installed at the nodes. In addition, when using cylindrical material, the reduction of the cross-sectional area at the joint reduces the compressive force loading characteristics.

  In order to be practically employed in structural design, the joining system should be relatively easy to manufacture. In tube and ball node systems, ball nodes are difficult to manufacture and are often limited in size. Tube and ball nodal systems also have limitations on the material types that can be used. Even though polymers, plastics, aluminum, various composites, etc. have the requisite strength, cost, and appearance design characteristics desirable for adoption in reticulated structures, such materials are often wary of welding. . The use of welding for the production of the network structure is costly and time consuming. Welding requires quality control standards, the use of raw materials, and skilled craftsmen. In tube and ball nodal systems, the use of welding reduces the allowable load on certain materials and is driven out of consideration for certain applications.

  Finally, because many of the reticulated structures have complex properties, they are difficult and expensive to build and assemble in the field. Building these structures is a fixed and non-reversible process, and in the process of building a network structure for both nodes that have not yet been joined to the frame material, they are often already joined and fixed. The prefabricated joint series such as the frame material has firmly fixed the mating structure to be joined in place, and a large force is required to move the node to join the pipe. I need. This task is time consuming and can damage the structure.

  Thus, it is desirable to have a joining system that can be simply modeled as an elongated member that can be fixedly attached to a node without incorporating hinges and / or short flexible materials that cause force transfer at the joint. . It would also be desirable to develop a joining system in which the cylindrical member used does not need to be noticeably reduced in its cross-sectional area at the joining point. Furthermore, there is no need to weld to attach the frame material to the node, and in order to provide the function of inserting the frame material between the two fixed points, a built-in gap can be prepared between the nodes, It would be desirable to have a bonding system. It would also be desirable to have a joining system design method in which system components are easier to make, have a wider range so that various material types are available, and have fewer constraints on shape. It is also desirable to avoid load bolts that are subject to shear and compressive stresses.

(Summary of Invention)
Accordingly, as an embodiment of the present invention, a coaxial junction (CAJ) system and a method for assembling a CAJ system are provided herein.

  The CAJ system provided herein, the moment resistance joint, comprises a frame material, a block connector, a compression sleeve, an end cap attachable to the frame material and the compression sleeve, and an end cap-block connector attachment means.

  In a preferred embodiment of a CAJ system, moment resistance joint, a cylindrical frame material, a complementary serrated screw for attaching an end cap to the compression sleeve and frame material, and for securing the end cap to the block connector, Use tension bolts. The block connector and tension bolt, as one example, may be hollow to support an electric wire or the like.

  The whole or part of the network structure can be constructed using a CAJ system, moment resistance bonding. Such a structure consists of a number of frame materials, block connectors, compression sleeves, end caps, and end cap-block connector attachment means.

  To assemble the CAJ system, a compression sleeve is slid into the frame material and placed near the end of the frame material. The frame material is then placed near the block connector. Place the end cap and frame material attached to the block connector in alignment. Once placed in alignment, the end cap is moved towards the end of the frame material and attached. The sleeve is then slid over the end cap toward the block connector and attached to the end cap.

  Embodiments of the present invention will be described with reference to the following drawings, which are modified from standard engineering drawings. The information contained in the figures is incorporated as a detailed description of the invention. However, various changes can be made to the contents shown in the figure without departing from the scope of the present invention.

It is a model elevation view which shows the dome-shaped network structure using the moment resistance characteristic of this invention. It is a top view which shows the part which assembled the CAJ moment resistance joining system. FIG. 3 is a plan view showing a typical series of CAJ system junctions, taken from within one circle connector and circle 3 of FIG. It is sectional drawing which shows the joining shown in FIG. 2 of CAJ system joining which provided the joining screw on the outer side of the frame material. It is a top view which shows the state before an assembly of the CAJ system shown in FIG. FIG. 6 is a partial cross-sectional view taken from within a circle 6 in FIG. 5. It is a top view which shows the state which assembled the part of CAJ system shown in FIG. FIG. 8 is a partial cross-sectional view taken from within a circle 8 in FIG. 7. It is sectional drawing which shows another Example of CAJ system joining which provided the joining screw inside the frame material. It is a schematic cross section which shows a hollow tension bolt. It is a model elevation view which shows a hollow block connector. It is a schematic cross section which shows the hollow block connector shown in FIG. FIG. 10 is a schematic cross-sectional view similar to FIG. 9 except that a large-diameter frame material is drawn.

(Detailed explanation)
The dome-shaped mesh structure 9 on the foundation as shown in FIG. 1 uses at least one CAJ system 11 as shown in FIGS. In one embodiment of the system, a plurality of CAJ system joining means are used, and each joining means 12 comprises a three-way block connector 14, a frame material 15, and a frame material-block connector mounting unit 16. In practice, the frame material 15 passes through the frame material-block connector mounting unit 16 and is attached to the block connector 14 functioning as a nodal element.

  In FIG. 4, the mounting unit 16 used in the CAJ system includes a compression sleeve 18 into which the frame material 15 is inserted (compression sleeve 18) and an end cap that can join the frame material 15 and the sleeve 18. 19 and an attachment mechanism 20 for fixing the cap 19 to the block connector 14. The end cap and the sleeve each have an inner portion and an outer portion, the attachment mechanism functions as a tension support, and the sleeve functions as a compression support. The end cap can freely slide on the attachment mechanism, and the frame member, the end cap, the sleeve, and the attachment mechanism are configured coaxially.

  This embodiment has an outer diameter (OD) or a frame material joining means with an external thread. The end cap 19 is in the shape of a cylindrical cup, and the opening 22 at the bottom thereof receives a mounting means 20 such as a tension bolt. The end cap 19 has a hollow portion 23 that is accessible from the top opening. The tension bolt is inserted through the hollow portion of the cap and the opening 22 and screwed into the block connector to a predetermined depth. Thus, the separation of the end cap from the block connector is limited. A serrated screw 34 is engraved on the inner cap surface, and a serrated screw 36 is engraved on the outer cap surface. Both screws extend perpendicular to the joint surface of the block connector.

  The end cap can be joined to the block connector in the field or at the factory. However, since it is not necessary to use bolts at the construction site, it is desirable to join them at the factory, which can save time at the construction site. In addition, by setting the tension bolt at a predetermined depth in the block connector, the size control of the structure can be simplified.

  The end cap base 24 is parallel to the block connector and can rest at the same height relative to the mating surface 28 on the block connector, or moves along the tension bolt and ends with the bolt head 32. It is also possible to contact the washer 30 between the base of the part cap. Thus, there is a limit to the degree of separation of the end cap from the nodal element. The joining surface 28 has a circular recess into the block connector. The recess has a diameter that exactly receives the outer diameter of the sleeve. Thus, a shearing force is generated by joining the block connector recess and the sleeve.

  A cylindrical frame member 15 having end portions near and far from the block connector can be attached to the hollow portion surface of the end cap. A sawtooth screw 40 is engraved on the outer surface near at least one end of the frame material and is complementary to the sawtooth screw 34 on the end cap. Thus, a tensile force is generated by the tension bolt, the end cap, and the frame material. This tension path is from the block connector to the tension bolt, from the tension bolt to the end cap via the washer, and from the end cap to the frame material via the screws 34 and 40. A sawtooth screw provides relatively little support in compression. Furthermore, since the end cap can slide on the bolt toward the block connector, no compression force is applied to the bolt.

  Therefore, a hollow cylindrical sleeve 18 is provided. The sleeve 18 has a diameter sufficient to enclose both the frame material and the end cap, and functions as a length adjuster. That is, the functional length of the frame material is made larger than its actual length, and the frame material can slide with respect to the frame material. The hollow portion of the sleeve 18 can be accessed from the upper and lower openings. The sleeve 18 has a sawtooth screw 38 on its inner surface that is complementary to the compression sawtooth screw 36 on the outer surface of the end cap. The end cap functions to secure the sleeve between the frame material and the block connector. The compressive force is generated by the sleeve, the end cap, and the frame material. The compression path is from the block connector to the sleeve, from the sleeve to the end cap via a screw joint, and from the end cap to the frame via the abutment of the end 42 of the frame material on the circumferential shoulder 44 of the end cap. Trace to the material. The shoulder thus constitutes a thrust seat for the application of compressive force.

  The compression sawtooth screw is reinforced to prevent the end cap from being pushed into the sleeve. The abutting joint between the sleeve and the block connector does not provide support for tensile forces. However, as a whole joining unit, each element is well resistant to tensile, compressive and shearing forces, thus providing a perfect joint that can withstand these forces. Further, since the frame material is adhered to the block connector by the joining unit having no reduced diameter, a moment resistance joint is formed.

  5 to 8, when assembling the OD frame material of the CAJ type system, the pull bolt 20 with the washer 30 attached is passed through the base 24 of the end cap 19 so that the end cap is movably blocked. Screw into the block connector 14 while attaching to the connector. The frame material 15 is then inserted through the sleeve and positioned so that the screws on its outer end face align with the end cap between the two block connectors. Thus, the frame material, the sleeve, the end cap, and the tension bolt are coaxial. Due to the length of the frame material, a gap 46 remains at each end between the frame material and the tension bolt, and the frame material is easily inserted between the two block connectors.

  Only the one end of the frame material will be described for the rest of the assembly. A portion of the washer and tension bolt is in the hollow portion of the end cap and the end cap is moved toward the frame material as indicated by arrow 48 in FIG. The saw-tooth screw on the inner surface of the end cap is screwed with the saw-tooth screw on the outer surface of the frame member, and the frame member is fastened until the end portion 42 of the frame member contacts the shoulder 44 of the end cap. Here, the washer 30 is closely engaged between the bolt head 32 and the bottom surface of the end cap 19 (which forms the bottom surface of the hollow portion 23). In the system shown in FIGS. 2 to 8 and 9, the shaft portion near the head of each tension bolt 20 is not threaded and is preferably not circular but engaged, for example, as a hexagon with a spanner. It can be so. Thus, the tension bolt is first positioned with its head sufficiently separated from the block connector so that the end cap moves along the tension bolt so that the shoulder 42 can make desired contact with the end of the frame material 15. To. The gap or play between the bolt head and washer 30 and the base of the end cap recess is screwed into the block connector so that the washer 30 is between the bolt head and the end cap. It is removed by pre-tensioning the bolts if necessary and tightly engaged.

  Then, the compression sleeve 18 is moved along the frame material toward the end cap, the sawtooth screw on the inner surface of the cylindrical sleeve is screwed with the sawtooth screw on the outer surface of the end cap, and further tightened, the lower end of the compression sleeve 18 becomes the block connector. It abuts tightly on the joint surface 28. Once the assembly is assembled, it is secured with setscrews 21 that collide with the end cap screws.

  The length of the frame material is determined by the design constraints of the structure. However, once the length is chosen, tolerances must be reduced to ensure conformity with the end cap and to ensure that the sleeve end 50 is properly aligned with the end cap.

  Using a spanner wrench, the end cap is rotated and screwed into the frame material, and the compression sleeve is rotated and joined to the end cap and brought into contact with the joining surface 28 of the block connector. The spanner wrench has an elongated handle having a curved head and a protrusion extending from the head toward the handle. Depending on the embodiment, the sleeve, end cap and frame material have an opening 45 (FIG. 2) which receives the spanner wrench protrusion. In the properly assembled joining means 12, the close contact level when the end cap shoulder 44 and the frame material end 42 are engaged, and the washer 30 is between the bolt head 32 and the end cap 19. The adhesion level when the compression sleeve is held by the compression sleeve and the adhesion level when the compression sleeve abuts on the joining surface 28 are within the range of thermal expansion and contraction expected to be received by the joining element. Sufficient to hold. Although the block connector 14 is shown as hexagonal, it is not really limited to this, and can be a three-dimensional structure for use in various spatial frames. The block connector must be able to receive enough of the frame materials that need to be attached. As long as this point is taken into consideration, the block connector may have any size, shape and structure. Without the physical demands of spherical nodes, the CAJ system is more compatible with space frame applications and can be assembled more efficiently. Similarly, the frame material 15 is desirably linear and cylindrical in shape, but the frame material is not rotated when the CAJ system is actually implemented. Therefore, the frame material is not limited to the shape as described above. The frame material may have any size and shape, such as a curved tube, a twisted tube, a prism-shaped cross-sectional tube, and an octagonal cross-sectional tube. In short, the end of the frame material may be attached to the end cap. Such a unique frame material-block connector mounting unit attaches the frame material to the block connector without manipulation or rotation of the frame material, thus allowing use of non-cylindrical, non-linear or even entangled frame material.

  Since the CAJ system consists of elements joined by rigid joints, there are various advantages. The removal of the tapered junction allows the moment to be transferred and simplifies the design without the need to use a virtual hinge when modeling the required network structure. Due to its moment resistance capability, the CAJ system can also be used for ductile frames, triangular frames and the like. Furthermore, the frame material can be handled like a beam. The load is applied to the frame material, so equipment such as loud speakers and lights can be installed in the most convenient location, whether node or frame material.

  Since the CAJ system uses a frame material (rigid frame) that is fixedly joined to the block connector so as to resist momentum, the advantage of the compression durability ability of the frame material can be utilized to a greater extent. Is up to twice the standard tube and ball nodal system. As a result, the CAJ system can have the same load endurance capability as a tube and ball nodal system of the same size, even with a half diameter and double length tube.

  The CAJ system increases the range of materials that can be used in the field of building structures because it eliminates the need to weld frame material to the joining unit. Various materials that are weak to welding having characteristics such as desired strength, cost, and aesthetics can be used without fear of damage due to welding, and applied stress can be reduced. Also, by eliminating welding, assembly is quick, cost is reduced, processes are reduced, material consumption is reduced, and the flexibility of structure construction can be increased. In particular, since the CAJ system provides a built-in gap for the frame material, it is no longer a problem to insert the frame material between the two block connectors. Unlike some tube and ball node systems, the CAJ system facilitates the loading and exchange of frame material between two fixed nodes. This is possible because the sleeve compensates for some of the length between the block connectors and completely overlaps the frame material before joining.

  Most rigid materials can be used in the CAJ system. In particular, since welding is not required at the time of assembling, even a weak material such as aluminum or a composite material can be used without impairing properties such as strength and extensibility.

  FIG. 9 shows a second embodiment of the CAJ design system having an inner diameter (with internal thread) frame material. Here, the same reference numerals are attached to the same reference numerals for the same elements as described above. indicate. The end cap 19A is attached to the block connector 14A via a full-length threaded stud 80, two jam nuts 82 and a washer 30A. With this arrangement, it is possible to adjust the maximum separation distance of the end cap from the block connector in the field, and the frame material can be in a desired fixed state between the two block connectors.

  The end cap is cylindrical and preferably has a hollow portion accessible from the upper opening, and preferably has a constant diameter over the entire hollow portion. Since the outer peripheral shape of the end cap changes, the head 52 has a smaller outer periphery than the bottom 54. A sawtooth screw 34A is engraved on the outer side of the head, and is screwed into the inner sawtooth screw 40A of the frame material 15A. A sawtooth screw 36A is engraved on the bottom at the bottom, and is screwed into the inner sawtooth screw 38A on the sleeve 18A. The frame material can be attached to the male screw of the head portion 52 of the end cap, and includes a saw-tooth screw 40A on the inner surface of the end portion. The base of the end cap extends parallel to the block connector joint surface 28A and can rest at the same height as the block connector joint surface 28A. The stud extends through the base of the end cap and enters the interior of the block connector. The jam nut 82 and the end cap base 24A are separated by a washer 30A, and the stud is screwed into the block connector.

  The hollow cylindrical sleeve 18A has a diameter sufficient to surround the frame material 15A and the end cap 19A, functions as a length adjusting body, and is slidable with respect to the frame material. The hollow portion of the sleeve is accessible from both the open top and bottom of the sleeve. A sawtooth screw 38A complementary to the sawtooth screw 36A on the outer periphery of the bottom of the end cap is engraved on the surface of the hollow portion. The end cap functions to secure the sleeve between the frame material and the block connector. Thereby, the sleeve resists the moment applied to or from the frame material between the end cap and the block connector 14A.

  This female threaded frame material of the CAJ design system is assembled in the same way as in the previous embodiment. In other words, the pulling force rod with the washer and the lock nut attached is passed through the bottom of the end cap and screwed into the block connector so that the end cap is movably attached to the block connector. The frame material is then inserted through the sleeve and the frame material is positioned so that its screws align with the end cap. The end cap is moved toward the frame material along with a portion of the washer and tension stud. The saw-tooth screw on the outer periphery of the end cap is screwed with the saw-tooth screw on the inner surface of the frame material, and is tightened using a spanner wrench or the like. When the washer 30A is in close contact between the end cap base and the jam nut, the lower end 44A of the frame material is in close contact with the shoulder 42A of the end cap. The sawtooth screw on the inner surface of the cylindrical sleeve is screwed with the sawtooth screw on the outer surface of the end cap, and when tightened with a spanner wrench, the lower end of the sleeve comes into close contact with the block connector joining surface 28A.

  The sawtooth screws that attach the frame material to the end cap and the sawtooth screws that attach the sleeve to the end cap, which are complementary to each other, may be alternated in screw direction to facilitate assembly. By staggering the screw directions, for example, the end cap is screwed into the frame material and then the sleeve is screwed into the end cap without reversing the initial screw connection between the end cap and the frame material. be able to. If the screw direction can be alternated between the two attachment points of the end cap and the frame material, and the end cap and the sleeve, the screw direction may be clockwise or counterclockwise. Although this embodiment employs complementary serrated screws as means for attaching the frame material to the end cap and the sleeve to the end cap, other attachment means, such as welding, are used in the CAJ system, although not preferred. May be.

  In another embodiment, the tension bolt 60 is hollow in the axial direction and the wire W passes through the central passage 64 of the bolt through its opening 62 as shown in FIG. As described above, the shape of the block connector is not limited to that illustrated. In short, it is only necessary that the mounting unit 16 can position the frame material 5 fixedly with respect to the block connector 14. Also in the embodiment shown in FIGS. 11 and 11A, the block connector 70 is hollow and has an opening 72 in each joint surface 74, so that the wire used in the mesh structure can be received. The block connector is formed with a hatch 78 that allows access to pass the wire.

  Although the frame material has been described as having an internal hollow portion, it may be solid and not substantially hollow. The solidity of the frame material depends on the required load carrying capacity and other design factors.

  The CAJ design system in the above embodiment uses the tension bolts to attach the end caps to the block connectors, but other attachment means such as full length threaded studs may be used.

  In addition, the CAJ design system can include a threaded bush to join pipes of different diameters as shown in FIG. The tubular frame material 80 having different dimensions can be joined to the same block connector by the bush 79.

  In addition, the design flexibility of the block connector 14A, counterbore 28A, compression sleeve 18A, and end cap 24A allows the system to receive tubular frames of various diameters at the same node, and the use of a threaded bush 79. It is possible to make it a dimension that does not require.

9 Network structure 12 Joining means 14 Block connector 15 Frame material 16 Mounting unit 18 Sleeve 19 End cap 20 Mounting mechanism

Claims (24)

Joining means for the nodal elements (14) of the network structure,
Frame material (15);
An inner connector part (19) and an outer connector part (18);
A tension support (20) attached to the node element (14) and extending slidably through the inner connector portion (19), the tension support (20) and the inner connector A tension support (20) configured to cooperate with portions (19) to define a position of limited movement of the inner connector portion (19) along the tension support (20) from the nodal element (14). When,
First screw joining means (34, 40) between the inner connector portion (19) and the frame material (15) and formed to resist pulling of the frame material (15); First screw joining means (34, 40) defining a thrust seating surface (42) for applying a compression force of the material (15) to the inner connector part (19);
The compression is applied to the frame material (15) between the inner connector portion (19) and the outer connector portion (18) and applied to the outer connector portion via the inner connector portion (19). Second screw joining means (36, 38) for sending a load to said nodal element (14);
When the inner connector part (19) is in the movement restricted position relative to the nodal element (14) in the completed joining means, the frame material (15) is the thrust seating surface of the inner connector part (19). The tension support (20), the inner connector part (19) and the outer connector so that the outer connector part (18) is compressed and abuts against the nodal element (14). A second screw joining means (36, 38) in which the dimension of the portion (18) is defined;
I have a,
The improved joining means characterized in that the second screw diameter according to the second screw joining means (36, 38) is larger than the first screw diameter according to the first screw joining means (34, 40) .   The joining means according to claim 1, wherein the inner connector portion has a female screw and a male screw.   The joining means according to claim 2, wherein the outer connector portion has a female screw that is screwed with a male screw of the inner connector portion.   3. The joining means according to claim 2, wherein the frame member has a male screw at one end to be screwed with a female screw of the inner connector portion.   The joining means according to claim 2, wherein the female screw of the inner connector portion has a tension sawtooth screw.   The joining means according to claim 2, wherein the male screw of the inner connector portion has a compression sawtooth screw.   The joining means according to claim 1, wherein the inner connector portion has a first male screw and a second male screw.   The joining means according to claim 7, wherein the frame member has a female screw at one end to be screwed with a second male screw of the inner connector portion.   8. The joining means according to claim 7, wherein the female screw of the outer connector portion and the first male screw of the inner connector portion have compression sawtooth screws.   The inner connector portion has an end cap having an upper end, a lower end, and a hollow portion, the tension connector extends through the lower end of the end cap, and the frame material passes through the upper end of the end cap. The joining means according to claim 1, wherein the joining means extends into the hollow portion.   The thrust seat has a shoulder in the hollow portion of the inner connector portion, and one end of the frame material abuts on the shoulder portion, and the compression force of the frame material is applied to the inner connector portion. The joining means according to claim 10, characterized in that:   The joining means according to claim 1, wherein the outer connector portion is slidable with respect to the frame material.   The joining means according to claim 1, wherein the outer connector portion can extend beyond the frame material to abut against the nodal element.   The joining means according to claim 1, wherein the compression sleeve of the outer connector portion has a diameter sufficient to surround the inner connector portion and the frame material.   The joining means according to claim 1, wherein the tension support has a tension bolt.   16. The joint according to claim 15, wherein the tension bolt has a head, and the head defines the movement limit position of the inner connector portion along the tension bolt from the nodal element. means.   The joining means according to claim 1, wherein the tension support is hollow.   The joining means according to claim 1, wherein when the frame material is connected to the nodal element, the tension support defines a gap between the frame material and the nodal element.   The tension support includes a stud and a pair of nuts, and the stud and the pair of nuts adjust the movement limit position of the inner connector portion along the tension support from the nodal element. The joining means according to claim 1, wherein the joining means is formed to be possible.   The joining means according to claim 1, wherein the frame member has a length and has a substantially uniform cross section over the entire length.   The joining means according to claim 1, wherein the frame material is cylindrical.   The joining means according to claim 1, further comprising a bush for joining the inner connector portion to the frame member.   The joining means according to claim 1, wherein the inner connector portion, the outer connector portion, the frame member, and the tension support are arranged in a coaxial relationship. A method of joining a frame member having a joining end to a node element (14) of a network structure,
(A) while allowing the inner connector part (19) to move along a path away from the nodal element (14) until it contacts the stop (30), the inner connector part (19) and outer connector part ( 18) capturing the inner connector portion (19) of 18) into the nodal element (14);
(B) separating the inner connector portion (19) from the stop (30) to align the joining end of the frame material with the inner connector portion (19);
(C) moving the inner connector portion from the nodal element (14) toward the stop (30);
(D) joining between the joining end of the frame material and the inner connector portion (19), thereby positioning the inner connector portion substantially at the stop (30), and joining the frame material; Preventing the inner connector portion from being pulled away from the end, and bringing the joint end of the frame material into contact with the inner connector portion (19) in a plane substantially perpendicular to the path;
(E) mounting the outer connector part (18) around the inner connector part (19) to achieve a bond therebetween, thereby bringing the outer connector part into compression contact with the nodal element (14); Preventing the inner connector part (19) from moving toward the nodal element (14);
A bonding method comprising:
The step of capturing comprises the step of inserting a tension support (20) through the inner connector portion (19) and coupling the tension support (20) to the nodal element (14);
Achieving joining between the joining end of the frame material (15) and the inner connector part (19) comprises screwing the frame material (15) to the inner connector part (19). ,
Achieving a bond between the outer connector part (18) and the inner connector part (19) comprises screwing the outer connector part (18) to the inner connector part (19). The joining method characterized by this.

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