Coplanar rod truss joint

Abstract

A coplanar rod truss node comprises an adjusting screw, an intermediate rod, rods on both sides and a fixing nut; the adjusting screw is perpendicular to the main load-bearing surface of the coplanar rod truss node; the adjusting screw is mounted on the intermediate rod, rods on both sides and the fixing nut from the inside out; the intermediate rod comprises a connected sleeve A and a straight rod; the axis of the straight rod coincides with the main load-bearing surface; the rods on both sides comprise a sleeve B and a bent rod; one end of the bent rod is connected to sleeve B, the middle part is bent toward the intermediate rod, and the axis of the other end coincides with the main load-bearing surface; the fixing nuts are threadedly connected to the adjusting screw on both sides to clamp the intermediate rod and rods on both sides; the sleeve A and sleeve B are mounted on the adjusting screw to drive the intermediate rod and rods on both sides to move along the axis of the adjusting screw and rotate around the axis of the adjusting screw to reach a suitable position and orientation; the fixing nut A is fixed; therefore, it can provide a freer orientation selection and offset the deviation of the truss rods, thereby reducing the construction difficulty and improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of steel structures, and in particular to a coplanar rod type truss node. Background Art

[0002] Truss structure refers to a plane or space structure composed of straight bars, generally with triangular units. Under load, the truss rods mainly bear axial tension or pressure, so that the strength of the material can be fully utilized. When the span is large, it can save materials, reduce deadweight and increase rigidity compared to solid beams. Therefore, it is suitable for load-bearing structures and tall structures with large spans, such as roof trusses, bridges, transmission line towers, satellite launch towers, hydraulic gates, crane racks, etc. Compared with solid steel beams, the steel truss is characterized by replacing flanges with chords and webs with webs, and connecting the webs and chords to each other through node plates (or other parts) with welds or other connections at each node; sometimes, the rods can be directly welded to each other (or other connections) without node plates. In this way, the bending moment of the plane truss as a whole is manifested as axial compression and tension of the upper and lower chords, and the shear force is manifested as axial compression or tension of each web. The key engineering points that need to be considered during the construction of truss structures include connection methods and web systems; steel trusses can be connected by welding, ordinary bolts, high-strength bolts or riveting. The web system needs to have various forms of structure according to design requirements; closely related to the connection method and web system is the node design of the truss structure; the truss node structure in the prior art only has two types: plate nodes and spherical nodes; the node positions of plate nodes and spherical nodes are fixed positions, and the orientation of the rods connected to the nodes is also fixed; during the construction process, once the truss rods have some deviations, the truss structure cannot be connected; it is very difficult to repair the truss structure and it greatly delays the construction period. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a coplanar rod truss node.

[0004] The technical solution of the present invention is: a coplanar rod type truss node, comprising an adjusting screw, an intermediate rod, two side rods and a fixing nut;

[0005] The adjusting screw is horizontally arranged, and both ends are connected to other parts of the truss structure; the adjusting screw is provided with a middle rod, two side rods, and a fixing nut respectively arranged on both sides of the middle;

[0006] There is one middle rod, which includes a sleeve armor and a straight rod connected to each other; the sleeve armor is slidably sleeved on the adjusting screw; one end of the straight rod is connected to the sleeve armor perpendicular to the axis of the sleeve armor, and the other end is connected to other parts of the truss structure;

[0007] There are several rods on both sides, including connected sleeve B and bent rods; sleeve B is slidably sleeved on the adjusting screw; one end of the bent rod is connected to sleeve B perpendicular to the axis of sleeve B, the middle part is bent and transitioned toward the middle rod, and the axis of the other end is in the same vertical plane as the axis of the middle rod, and is connected to other parts of the truss structure;

[0008] There are two fixing nuts, which are respectively connected with the adjusting lead screws through threads on both sides to clamp the middle rod and the rods on both sides.

[0009] Preferably, the ends of the middle rod and the two side rods connected to other parts of the truss structure are provided with external threads.

[0010] Preferably, a reinforcing rib plate is provided on the outer circumferential surface of the middle portion of the bent rod, which is bent toward the middle rod.

[0011] Preferably, the end surface of the fixing nut facing the middle rod is provided with fine small teeth; the small teeth are distributed circumferentially around the axis of the fixing nut; the end surfaces of the outermost two side rods, away from the middle rod, are provided with fine small teeth; the small teeth and the small teeth are interlocked.

[0012] Preferably, a boss is provided on the end face of the fixing nut away from the intermediate rod; an external thread A is provided on the outer wall of the boss; a locking nut is also provided at the coplanar rod truss node; one end of the locking nut is threadedly connected to the adjusting screw, and the other end is provided with an internal thread A that is threadedly connected to the external thread A.

[0013] Preferably, the thread length of the external thread A is less than the inner wall depth of the locking nut where the internal thread A is located.

[0014] Preferably, the tooth profile of the external thread A is smaller than the thread profile of the adjusting screw.

[0015] Preferably, a flat washer and a spring washer are also mounted on the adjusting screw; the flat washer or the spring washer are respectively arranged between the middle rod and the two side rods, and between the adjacent two side rods.

[0016] The beneficial effects of the present invention are as follows: the coplanar rod truss node of the present invention comprises an adjusting screw, an intermediate rod, two side rods and a fixing nut; the adjusting screw is perpendicular to the main force-bearing surface of the coplanar rod truss node; the adjusting screw is sleeved on the intermediate rod, two side rods and the fixing nut from the inside out; the intermediate rod comprises a connected sleeve A and a straight rod; the axis of the straight rod coincides with the main force-bearing surface; the two side rods comprise a sleeve B and a bent rod; one end of the bent rod is connected to sleeve B, the middle part is bent toward the intermediate rod, and the axis of the other end coincides with the main force-bearing surface; the fixing nut is threadedly connected to the adjusting screw on both sides to clamp the intermediate rod and the two side rods; the sleeve A and sleeve B are sleeved on the adjusting screw, which can drive the intermediate rod and the two side rods to move along the axial direction of the adjusting screw and rotate around the axis of the adjusting screw to reach a suitable position and orientation; the fixing nut A is fixed; therefore, it can provide a freer orientation selection and offset the deviation of the truss rods, thereby reducing the construction difficulty and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of a coplanar rod truss node of the present invention;

[0018] Figure 2 yes Figure 1 I magnified view of;

[0019] Figure 3 yes Figure 1 II enlarged view;

[0020] Figure 4 yes Figure 1 A top view of

[0021] Figure 5 yes Figure 4 AA section view;

[0022] Figure 6 Embodiment 1 Figure 4 Sectional view in the BB cutting direction;

[0023] Figure 7 It is a three-dimensional diagram of the two outermost rods;

[0024] Figure 8 yes Figure 7 III magnified view;

[0025] Fig. 9 is a sectional stereoscopic diagram of the fixing nut and the locking nut in the first embodiment after being threadedly connected;

[0026] Fig.10 It is a three-dimensional picture of the spring pad;

[0027] Fig.11 In the second embodiment Figure 4 Sectional view in the BB cutting direction;

[0028] Fig.12 is a sectional stereoscopic diagram of the fixing nut and the locking nut in the second embodiment after being threadedly connected;

[0029] In the figure: 1. adjusting screw, 2. middle rod, 21. sleeve A, 22. straight rod, 3. two side rods, 31. sleeve B, 32. bent rod, 33. reinforcing rib plate, 34. reinforcing rib plate, 35. small tooth B, 4. fixing nut, 41. small tooth A, 42. boss, 421. external thread A, 5. anti-loosening nut, 51. internal thread A, 6. flat washer, 7. spring washer. DETAILED DESCRIPTION

[0030] Example 1: See Figure 1-10 , a coplanar rod type truss node, comprising an adjusting screw, an intermediate rod, two side rods and a fixing nut;

[0031] The adjusting screw is set horizontally, and both ends are connected to other parts of the truss structure; the adjusting screw has a middle rod, two side rods, and a fixing nut respectively mounted on both sides; the adjusting screw is a mounting component for all coplanar rod truss nodes;

[0032] There is an intermediate rod, which includes a connected sleeve armor and a straight rod; the sleeve armor is slidably mounted on the adjusting screw; one end of the straight rod is connected to the sleeve armor perpendicular to the axis of the sleeve armor, and the other end is connected to other parts of the truss structure; the intermediate rod is located in the middle of the coplanar rod truss node; the so-called middle of the coplanar rod truss node is not the center in the geometric sense, that is, the midpoint position of the adjusting screw, but refers to the point on the adjusting screw where the main bearing force of the truss structure at the connecting part of the coplanar rod truss node passes through the main bearing force; when setting the adjusting screw, make the adjusting screw axially perpendicular to the main bearing force, so that the intermediate rod coincides with the main bearing force direction; in this way, the straight rod can better bear the main bearing force of the truss structure, and the entire truss structure will be more stable; and the sleeve armor slides on the adjusting screw so that the intermediate rod can find the middle position of the truss node defined above;

[0033] There are several rods on both sides, including connected sleeves B and bent rods; sleeve B is slidably sleeved on the adjusting screw; one end of the bent rod is connected to sleeve B perpendicular to the axis of sleeve B, the middle part is bent and transitioned toward the middle rod, and the axis of the other end is in the same vertical plane with the axis of the middle rod, and is connected to other parts of the truss structure; the actual installation positions of the rods on both sides on the adjusting screw are on both sides of the middle rod, starting from the middle rod and arranged outward in sequence, but the ends of the rods on both sides connected to other parts of the truss structure are in the same vertical plane with the middle rod; the vertical plane is the plane where the main bearing force is located; in this way, the bent rod can transfer the main bearing force to the adjusting screw through the relatively slow bending transition in the middle, so that the coplanar rod truss node can establish a stable connection relationship with other parts of the truss structure; and sleeve B slides on the adjusting screw to enable the rods on both sides to find a position to achieve the above state;

[0034] There are two fixing nuts, which are respectively connected to the adjusting screw threads on both sides to clamp the middle rod and the two side rods; the function of the fixing nuts is to fix the positions of the middle rod and the two side rods from both sides, so that the connection relationship between the middle rod, the two side rods and the other parts of the truss structure is stable; it should be noted that the middle rod and the two side rods can rotate around the adjusting screw; before the fixing nuts take effect, the middle rod and the two side rods do not interfere with each other and can be oriented to any angle of the above-mentioned vertical plane; such a coplanar rod truss node undoubtedly provides more direction options when establishing a connection relationship with other parts of the truss structure. Construction personnel can make choices according to the on-site conditions to offset the deviation of the truss rods for connection without repair, thereby reducing construction difficulty and improving construction efficiency.

[0035] The ends of the middle rod and the rods on both sides connected to other parts of the truss structure are provided with external threads so as to establish a threaded connection relationship with other parts of the truss structure.

[0036] A reinforcing rib plate is provided on the outer circumferential surface of the middle part of the bent rod, which is bent toward the intermediate rod, to strengthen the mechanical strength of the bent part of the bent rod and ensure that the main bearing force can be transmitted to the adjusting screw through the bent part of the bent rod.

[0037] The end face of the fixing nut facing the middle rod is provided with fine small teeth; the small teeth are distributed in a circle around the axis of the fixing nut; the end faces of the outermost two side rods, away from the middle rod, are provided with fine small teeth; the small teeth and the small teeth are interlocked with each other, increasing the friction between the fixing nut and the outermost two side rods, avoiding changes in the orientation and position of the middle rod and the two side rods; if the small teeth and the small teeth are not interlocked, once the coplanar rod type truss node is subjected to vibration along the axial direction of the adjusting screw, the orientation and position of the middle rod and the two side rods may change due to the gap caused by the vibration.

[0038] A boss is provided on the end face of the fixing nut away from the intermediate rod; an external thread A is provided on the outer wall of the boss; an anti-loosening nut is also provided at the coplanar rod truss node; one end of the anti-loosening nut is threadedly connected to the adjusting screw, and the other end is provided with an internal thread A that is threadedly connected to the external thread A; when the fixing nut has a tendency to move toward the anti-loosening nut, the anti-loosening nut relies on the threaded connection established with the adjusting screw to press the fixing nut to offset the movement tendency; when the fixing nut has a tendency to move away from the anti-loosening nut, the connection relationship established by the external thread A and the internal thread A can pull the fixing nut to offset the movement tendency; in this way, the movement tendency of the fixing nut in both axial directions can be offset by the anti-loosening nut, so that the position in the axial direction will not change; as a result, the axial position of the intermediate rod and the two side rods determined by the fixing nut will not change even if the screw is adjusted, and the entire coplanar rod truss node is stably connected to other parts of the truss structure.

[0039] The thread length of the external thread A is less than the inner wall depth of the anti-loosening nut where the internal thread A is located; in this way, the external thread A can form a complete thread connection with the internal thread A, making the anti-loosening effect of the anti-loosening nut better and more stable.

[0040] The adjusting screw is also equipped with flat washers and spring washers; the flat washers or spring washers are respectively arranged between the middle rod and the two side rods, and between the adjacent two side rods. The function of the flat washers is to separate the middle rod and the two side rods so that the middle rod and the two side rods will not interfere with each other, and at the same time ensure that the middle rod and the two side rods can be fixed in a suitable position; when the length of sleeve A and sleeve B cannot make the two side rods and the middle rod in a suitable position, the number or thickness of the flat washers used for separation can be increased; the function of the spring washers is to apply a certain axial preload force on the adjusting screw so that the middle rod and the two side rods are always kept in a tightened state to ensure that the direction of the middle rod and the two side rods will not change.

[0041] The working process of this embodiment:

[0042] In the preparation stage, according to the design requirements, the middle rod, the two side rods, the fixing nut and the anti-loosening nut are correspondingly mounted on the adjusting screw; according to the shapes of the middle rod and the two side rods, flat washers and spring washers are selectively mounted between the middle rod and the two side rods to ensure that the axes of the straight rod and the bent rod are on the same radial plane of the adjusting screw;

[0043] During the adjustment phase, establish a connection between the two ends of the adjusting screw and other parts of the truss structure, and adjust the screw to a horizontal setting; use the sleeve armor to move the middle rod to the position on the adjusting screw corresponding to the main bearing force surface; then adjust the rods and fixing nuts on both sides to the appropriate position in turn; leave a small gap between the fixing nut and the outermost two side rods for the appropriate position of the fixing nut; according to the design requirements, after ensuring that the orientation of the middle rod and the two side rods are correct, rotate the fixing nut to ensure the orientation and position of the middle rod and the two side rods;

[0044] In the anti-loosening tightening stage, the anti-loosening nuts are finally threadedly rotated from both sides to establish a complete threaded connection relationship between the internal thread A and the external thread A, thereby preventing the coplanar rod truss node from loosening.

[0045] Embodiment 2: See the attached specification Figure 1-5 , Instruction Manual Figure 7-8 , Instruction Manual Figure 10-12 , Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The difference is that the tooth shape of the external thread A is smaller than the thread shape of the adjusting screw; the adjusting screw is a very important load-bearing component of the truss structure, and the large tooth shape of the thread can ensure the mechanical strength of the adjusting screw; the external thread A is only for preventing the fixing nut from loosening, and does not require such a large mechanical strength.

Claims

1. A coplanar rod truss node, characterized in that: It includes an adjusting screw, an intermediate rod, two side rods and a fixing nut; The adjusting screw is horizontally arranged, and both ends are connected to other parts of the truss structure; the adjusting screw is provided with a middle rod, two side rods, and a fixing nut respectively arranged on both sides of the middle; There is one middle rod, which includes a sleeve armor and a straight rod connected to each other; the sleeve armor is slidably sleeved on the adjusting screw; one end of the straight rod is connected to the sleeve armor perpendicular to the axis of the sleeve armor, and the other end is connected to other parts of the truss structure; There are several rods on both sides, including connected sleeve B and bent rods; sleeve B is slidably sleeved on the adjusting screw; one end of the bent rod is connected to sleeve B perpendicular to the axis of sleeve B, the middle part is bent and transitioned toward the middle rod, and the axis of the other end is in the same vertical plane as the axis of the middle rod, and is connected to other parts of the truss structure; There are two fixing nuts, which are respectively connected with the adjusting screws by threads on both sides to clamp the middle rod and the rods on both sides; The middle rod and the ends of the rods on both sides connected to other parts of the truss structure are provided with external threads; A reinforcing rib plate is arranged on the outer circumferential surface of the middle part of the bent rod, which is bent toward the middle rod.

2. The coplanar rod truss node according to claim 1, characterized in that: The end surface of the fixing nut facing the middle rod is provided with fine small teeth; the small teeth are distributed circumferentially around the axis of the fixing nut; the end surfaces of the outermost two side rods, away from the middle rod, are provided with fine small teeth; the small teeth and small teeth are interlocked.

3. The coplanar rod truss node according to claim 1, characterized in that: A boss is provided on the end face of the fixing nut away from the middle rod; an external thread A is provided on the outer wall of the boss; a locking nut is also provided at the coplanar rod truss node; one end of the locking nut is threadedly connected to the adjusting screw, and the other end is provided with an internal thread A that is threadedly connected to the external thread A.

4. The coplanar rod truss node according to claim 3, characterized in that: The thread length of the external thread A is less than the inner wall depth of the lock nut where the internal thread A is located.

5. The coplanar rod truss node according to claim 3, characterized in that: The tooth shape of the external thread A is smaller than the thread shape of the adjusting screw.

6. The coplanar rod truss node according to claim 1, characterized in that: A flat washer and a spring washer are also mounted on the adjusting screw; the flat washer or the spring washer are respectively arranged between the middle rod and the rods on both sides, and between the adjacent rods on both sides.

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