Truss purline
By adopting a hollow-designed central web member and flat ends, the problems of large self-weight and weak connection of traditional truss purlins are solved, resulting in lightweight and high-strength truss purlins suitable for large-span buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CANGZHOU MAODA METAL STRUCTURE MFG CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional truss purlins have a large self-weight and weak connections, making it difficult to meet the stability requirements of large-span buildings.
The hollow design of the central web member and the flat end increases the contact area with the upper and lower chords, and the connection strength and stability are improved through welding and buffer pads.
The lightweight and high-strength truss purlins reduce self-weight, enhance the reliability and stability of connections, and are suitable for various external forces, thereby improving the overall stability of the building.
Smart Images
Figure CN224259739U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of roof structure technology, specifically to a truss purlin. Background Technology
[0002] Purlins, as a crucial component of the roof structure, directly bear the weight of the roofing materials (such as corrugated steel sheets, corrugated panels, etc.). In addition to their own weight, purlins also bear various external loads, including wind loads, snow loads, and live loads (such as loads generated by personnel performing maintenance on the roof). In snowy regions, the snow load generated by snow accumulation on the roof is transferred through the purlins; in coastal areas, the suction or pressure generated by strong winds acts on the roof, and the purlins are also needed to bear and transfer these forces to ensure the stability of the roof structure.
[0003] When a building has a large span, purlins are generally used in the form of truss purlins. Traditional truss purlins typically consist of a top chord, a bottom chord, and web members. The web members are mostly solid round or square steel, connected to the top and bottom chords by welding or bolting. On the one hand, the solid web members have a large self-weight, which increases the overall weight of the structure in large-span buildings, thereby increasing the burden on the foundation and construction costs. On the other hand, when solid web members are connected to the top and bottom chords, the small contact area between the end face of the solid web member and the top and bottom chords leads to a risk of unstable connection. Utility Model Content
[0004] To overcome the above-mentioned shortcomings in the prior art, this utility model provides a truss purlin with high lightweight and high overall strength.
[0005] The technical solution of this utility model is as follows:
[0006] A truss purlin includes an upper chord, a lower chord, a plurality of intermediate web members and end web members. Each of the intermediate web members is hollow and has flattened ends. The ends of each of the intermediate web members are respectively connected to the upper chord and the lower chord. Adjacent intermediate web members and the upper chord or the lower chord form a triangular structure.
[0007] Both ends of each of the aforementioned end web members are respectively connected to one end of the upper chord and the lower chord;
[0008] The lower chord is provided with connecting seats at both ends for connection to the main frame.
[0009] Preferably, the connector is provided with mounting holes.
[0010] In any of the above embodiments, it is preferred that the mounting hole is provided in the shape of an oval hole.
[0011] In any of the above embodiments, it is preferred that the mounting hole is provided with a countersunk hole and a gasket, the gasket being recessed into the countersunk hole.
[0012] In any of the above embodiments, it is preferred that the contact portion between the gasket and the countersunk hole is provided with a mutually cooperating locking structure.
[0013] In any of the above embodiments, it is preferred that a buffer pad is provided at the contact point between the lower chord and the main frame.
[0014] In any of the above embodiments, it is preferred that the cushioning pad includes a base and a colloid, the colloid covering the base, and a screw extending to the outside of the colloid is provided on the upper surface of the base.
[0015] In any of the above embodiments, it is preferred that a supporting rib is provided between two adjacent intermediate web members.
[0016] In any of the above embodiments, it is preferred that the main body of the end web member has a T-shaped cross-section, and the two ends of the end web member are connected to the base plate and the upper chord and the lower chord, respectively.
[0017] In any of the above embodiments, it is preferred that ribs are provided between the end web member, the upper chord member, and the lower chord member.
[0018] The truss purlin of this utility model includes an upper chord, a lower chord, several intermediate web members and end web members. Each of the intermediate web members is hollow, which reduces the self-weight while ensuring strength. Therefore, it has the beneficial effect of high strength.
[0019] Each of the intermediate web members has flattened ends, which connect to the upper chord and lower chord, respectively. The flattened ends of the intermediate web members increase the contact area with the upper and lower chords. This larger contact area provides a wider operating space for welding, optimizing the weld length and distribution. This allows for the even distribution of external forces at the weld joint, effectively reducing stress concentration. Therefore, the truss purlin exhibits high overall strength after forming. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of an embodiment of the interconnection of the various components of the truss purlin of this utility model.
[0021] Figure 2 This is a schematic diagram of a cross-section of the intermediate web member of the truss purlin of this utility model.
[0022] Figure 3 This is a schematic diagram of a preferred embodiment of the truss purlin connecting seat and gasket of the present invention.
[0023] Figure 4 This is a schematic diagram of one embodiment of the buffer pad for the truss purlin of this utility model.
[0024] Figure 5 This is a schematic diagram of a cross-section of the end web member of the truss purlin of this utility model.
[0025] Figure 6 This is a schematic diagram of an embodiment in which the end web members, upper chord members, and lower chord members of the truss purlin of this utility model are connected.
[0026] Explanation of the labels in the diagram:
[0027] 101-Upper chord; 102-Intermediate web member; 103-Supporting rib; 104-End web member; 105-Connecting seat; 106-Buffer pad; 107-Lower chord; 108-Mounting hole; 109-Gasket; 110-Colloid; 111-Screw; 112-Base; 113-Base plate; 114-Rib plate. Detailed Implementation
[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] In the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] Example 1:
[0031] like Figure 1 , 2 In the illustrated embodiment, the upper chord 101 bears the pressure generated by the roof load and transmits this pressure to the intermediate web members 102. Each intermediate web member 102 transmits the force transmitted by the upper chord 101 to the lower chord 107. The lower chord 107 bears tensile force. In the entire truss purlin system, the lower chord 107 and the upper chord 101 work together to balance the horizontal component of the pressure generated by the upper chord 101, preventing the truss structure from deforming due to horizontal force imbalance.
[0032] Each end web member 104 serves two purposes: firstly, it transmits the pressure from the upper chord 101 to the lower chord 107, ensuring effective force transmission. Secondly, the end web members 104, in conjunction with the upper chord 101 and lower chord 107, prevent excessive displacement of the upper chord 101 and lower chord 107 under lateral forces, thus improving the overall stability of the truss in the plane. Especially under the influence of horizontal forces such as wind loads and seismic forces, the end web members 104 enhance the truss's resistance to lateral displacement by constraining the relative movement of the upper chord 101 and lower chord 107.
[0033] The two adjacent intermediate web members 102 and the upper chord member 101 or the lower chord member 107 form a triangular structure, which can improve the overall strength of the truss purlins.
[0034] When selecting the components of this truss purlin, based on the roof load conditions, the upper chord 101 and lower chord 107 can be made of any of the following: C-shaped steel, H-shaped steel, bar steel, or angle steel. To reduce the weight of the truss purlin, each intermediate web member 102 is structurally hollow. When the end faces of each intermediate web member 102 are seamlessly connected to the upper chord 101 and lower chord 107, the ends of each intermediate web member 102 are flattened to facilitate cutting. Each intermediate web member 102 can be made of steel tubing, with the ends flattened using a press to create the flattened structure.
[0035] When the upper chord 101 is made of C-shaped steel, the edge of the C-shaped steel can be punched with a groove so that the groove can be matched with the corrugation of profiles such as color steel tiles and fiberglass tiles.
[0036] Connecting seats 105 are installed at both ends of the lower chord 107 for connecting to the main frame. The connecting seats 105 can be made of high-strength steel plates.
[0037] During the assembly of the truss purlins, welding is used between each intermediate web member 102 and the upper chord member 101 and the lower chord member 107, and between each end web member 104 and the upper chord member 101 and the lower chord member 107.
[0038] Example 2:
[0039] Based on Example 1, such as Figure 1 , 3 In the illustrated embodiment, when anchor bolts are installed at the main frame, the connecting seat 105 is fixed to the anchor bolts via the mounting holes 108 on the main body. This increases the speed at which the truss purlins are connected to the main frame.
[0040] Example 3:
[0041] Based on Example 2, such as Figure 3In the embodiment shown, the mounting hole 108 is oval-shaped to facilitate fine-tuning of the position between the truss purlin and the main frame during installation, and to facilitate alignment of the main frame and the mounting hole 108.
[0042] Example 4:
[0043] Based on Example 3, such as Figure 3 In the illustrated embodiment, when the truss purlin is installed at the main frame, in order to increase the contact area between the nut at the anchor rod and the connecting seat 105 and prevent the body of the connecting seat 105 from deforming at the mounting hole 108 due to the small contact area between the nut and the connecting seat 105, after the truss purlin and the main frame are installed, the pressure of the nut at the anchor rod is applied to the washer 109. The washer 109 contacts the body of the connecting seat 105 with a larger area, thereby preventing local deformation of the connecting seat 105.
[0044] The countersunk hole at mounting hole 108 serves to constrain the washer 109, preventing the washer 109 from rotating when the nut is tightened at the anchor rod.
[0045] Example 5:
[0046] Based on Example 4, such as Figure 3 In the embodiment shown, to prevent the truss purlin from moving relative to the oval hole and the anchor bolt due to external force after it is fixed to the main frame, a locking structure is provided at the contact part of the gasket 109 and the countersunk hole.
[0047] The locking structure can be in the form of mutually cooperating locking teeth.
[0048] Example 6:
[0049] Based on any of the embodiments 1-5, such as Figure 1 , 4 In the illustrated embodiment, a buffer pad 106 is provided at the contact point between the lower chord 107 and the main frame. After the truss purlin is connected to the main frame, the buffer pad 106 plays a shock-absorbing and buffering role, reducing the impact of vibration or external force on the connection point.
[0050] like Figure 4 In the illustrated embodiment, one optional form of the cushioning pad 106 is that it includes a base 112 and a colloid 110. The colloid 110 is disposed on the base 112 by covering it, ensuring an effective connection between the colloid 110 and the base 112. A screw 111 extending to the outside of the colloid 110 is provided on the upper surface of the base 112, which enables a quick and reliable connection between the cushioning pad 106 and the lower chord 107.
[0051] Example 7:
[0052] Based on any of the embodiments 1-6, such as Figure 1 In the illustrated embodiment, to prevent the intermediate web members 102 from deforming due to excessive pressure, a support rib 103 is provided between two adjacent intermediate web members 102. The support rib 103 can transmit the force to the adjacent intermediate web members 102.
[0053] Example 8:
[0054] Based on any of the embodiments 1-7, such as Figure 5 , 6 In the illustrated embodiment, to enhance the strength of the end web member 104 body and the connection strength between the end of the end web member 104 and the upper chord member 101 and the lower chord member 107, the end web member 104 has a T-shaped cross-section, and each end of the end web member 104 is provided with a base plate 113. When each end web member 104 is connected to the upper chord member 101 and the lower chord member 107, it is welded to the upper chord member 101 and the lower chord member 107 through the base plate 113 at the end of the end web member 104.
[0055] In this embodiment, as Figure 6 In the embodiment shown, in order to further improve the connection strength between the end web member 104 and the upper chord member 101 and the lower chord member 107, a rib plate 114 is provided between the end web member 104 and the upper chord member 101 and the lower chord member 107. The rib plate 114 is used to eliminate stress concentration at the connection point between the end web member 104 and the upper chord member 101 and the lower chord member 107.
[0056] The above-described embodiments are merely preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be covered within the protection scope of this utility model.
Claims
1. A truss purlin, comprising an upper chord (101), a lower chord (107), a plurality of intermediate web members (102), and end web members (104), characterized in that, Each intermediate web member (102) is hollow and has a flat structure at both ends. The two ends of each intermediate web member (102) are connected to the upper chord (101) and the lower chord (107) respectively. Two adjacent intermediate web members (102) and the upper chord (101) or the lower chord (107) form a triangular structure. The two ends of each end web member (104) are respectively connected to the end of the upper chord (101) and the lower chord (107); The lower chord (107) has connecting seats (105) at both ends that are connected to the main frame.
2. The truss purlin as described in claim 1, characterized in that, A mounting hole (108) is provided at the connector (105).
3. The truss purlin as described in claim 2, characterized in that, The mounting hole (108) is set in an oval shape.
4. The truss purlin as described in claim 2, characterized in that, A countersunk hole and a gasket (109) are provided at the mounting hole (108), and the gasket (109) is recessed into the countersunk hole.
5. The truss purlin as described in claim 4, characterized in that, The contact area between the gasket (109) and the countersunk hole is provided with a locking structure that cooperates with each other.
6. The truss purlin as described in claim 1, characterized in that, A buffer pad (106) is provided at the contact point between the lower chord (107) and the main frame.
7. The truss purlin as described in claim 6, characterized in that, The cushioning pad (106) includes a base (112) and a colloid (110). The colloid (110) covers the base (112), and a screw (111) extending to the outside of the colloid (110) is provided on the upper surface of the base (112).
8. The truss purlin as described in claim 1, characterized in that, A supporting rib (103) is provided between two adjacent intermediate web members (102).
9. The truss purlin as described in claim 1, characterized in that, The main body of the end web member (104) has a T-shaped cross section, and the two ends of the end web member (104) are connected by a base plate (113) and an upper chord (101) and a lower chord (107), respectively.
10. The truss purlin as described in claim 1, characterized in that, Ribs (114) are provided between the end web member (104), the upper chord member (101), and the lower chord member (107).