A roof-spanning, non-compression Z-shaped purlin device

Abstract

This utility model relates to a roof-spanning, compression-free Z-shaped purlin device, comprising a main purlin, a support assembly, and connecting nodes. The support assembly, with its segmented design, distributes the roof load and is positioned below the main purlin. The main purlin's web has an elongated hole. The support assembly is fixed to the main purlin via connecting nodes, which include a positioning pin and an anti-torsion groove. The positioning pin is inserted into the elongated hole on the main purlin's web and engages with the anti-torsion groove to limit and prevent torsion of the main purlin. This device achieves compression-free, high-precision purlin installation, improving construction efficiency and structural safety.

Description

Technical Field

[0001] This utility model relates to the field of metal roofing construction technology, and in particular to a cross-roof non-extrusion Z-shaped purlin device. Background Technology

[0002] With the rapid development of building-integrated photovoltaics and large steel structure factories, Z-shaped purlins, as the main roof support components, are widely used in the installation structures of large-span pitched roofs. Existing Z-shaped purlins are usually fixed by vertical supports and bolt connections. Although this can meet the structural requirements of the foundation, it still has many technical defects in practical engineering applications and is difficult to adapt to the needs of high-strength and high-precision construction.

[0003] First, existing Z-shaped purlins, when installed across rooftops using a vertical support method, concentrate the roof load at the connection point between the purlin and the support, easily generating localized compressive stress. This can lead to irreversible deformation of the purlins, affecting the accurate installation of subsequent photovoltaic (PV) brackets and consequently impacting the overall structural safety and lifespan of the roof. Second, existing purlin support systems typically rely on pre-tightened bolt connections. Due to significant accumulated errors during construction, high-precision positioning is impossible, resulting in positional deviations between the purlins and support nodes. This fails to meet the high-precision alignment requirements of current PV bracket installations. Furthermore, traditional node connections rely on ordinary mechanical fastening, leading to issues such as loose connections and high friction coefficients during use, requiring frequent maintenance and increasing operating costs.

[0004] Therefore, there is an urgent need to provide a new type of purlin device that is structurally reasonable, efficient in construction, and uniformly stressed, addressing the problems of severe extrusion deformation, low connection accuracy, and high maintenance costs associated with existing Z-type purlins. Utility Model Content

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a non-compression Z-shaped purlin device that spans the roof. This device effectively distributes roof loads, avoids localized compression deformation of the purlins caused by concentrated stress, and simultaneously achieves high-precision connection between the purlins and support nodes. This improves the accuracy of installation positioning, reduces construction errors, and solves problems such as loose connections and frequent maintenance caused by traditional bolt pre-tightening methods. Therefore, it meets the application requirements of large-span pitched roof buildings for purlin devices with high load-bearing capacity, low deformation, and low maintenance costs.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a cross-roof non-compression Z-shaped purlin device, including a main purlin, a support component, and a connecting node, characterized in that: the support component disperses the roof load through a segmented design and is set below the main purlin; the web of the main purlin has an elongated hole; the support component and the main purlin are fixed together by a connecting node; the connecting node includes a positioning pin and an anti-torsion groove; the positioning pin is inserted into the elongated hole on the web of the main purlin and cooperates with the anti-torsion groove to realize the limiting and anti-torsion of the main purlin.

[0007] Furthermore, the cross-sectional dimensions of the main purlin are 200×80×12mm.

[0008] Furthermore, the diameter of the oblong hole is 10–20 mm.

[0009] Furthermore, the support component includes a multi-level stepped design, with a height difference of 5mm between each level and a load-bearing capacity of ≥5kN per level.

[0010] Furthermore, a rubber shock-absorbing pad with a Shore hardness of 60±5 is provided at the bottom of the support component.

[0011] Furthermore, the clearance between the anti-torsion groove and the positioning pin is ≤0.05mm.

[0012] The beneficial effects of this utility model are:

[0013] This utility model achieves distributed support for roof loads through a segmented support component, avoiding the local compression deformation problem caused by concentrated loads in traditional purlin support methods, and improving the stability and structural reliability of purlins under roof loads.

[0014] This utility model effectively reduces the roof vibration transmission rate by setting a rubber shock-absorbing pad at the bottom of the support component, improves the overall structure's vibration reduction performance, avoids structural loosening or fatigue damage to the roof system caused by vibration, and further enhances the durability and safety of the purlin device.

[0015] This invention achieves high-precision positioning connection between purlins and support components through the precise cooperation of a perforated positioning pin and an anti-torsion groove, avoiding construction errors caused by traditional bolt pre-tightening methods.

[0016] This utility model effectively reduces the roof vibration transmission rate by setting a rubber shock-absorbing pad at the bottom of the support component, improves the overall structure's vibration reduction performance, avoids structural loosening or fatigue damage to the roof system caused by vibration, and further enhances the durability and safety of the purlin device. Attached Figure Description

[0017] Figure 1This is a structural schematic diagram of a cross-roof non-compression Z-shaped purlin device according to this utility model.

[0018] In the diagram, 1-main purlin; 2-support component; 3-connection node; 31-positioning pin; 32-anti-torsion groove. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] like Figure 1 As shown, this utility model provides a non-compression Z-shaped purlin device for roof spans, suitable for metal roof structures of pitched roof buildings with large spans of 5-15m, and especially suitable for high-precision, low-compression purlin systems required for photovoltaic bracket installation. The device includes a main purlin 1, a support component 2, and a connecting node 3.

[0021] The main purlin has a cross-sectional dimension of 200mm × 80mm × 12mm, with a standard Z-shaped structure. It is preferably made of Q345B cold-formed thin-walled steel, which possesses good strength and rigidity to meet the load-bearing requirements of large-span roof installations. The web of the main purlin is evenly provided with several elongated holes, with a diameter ranging from 10 to 20mm, for installation with locating pins at the connection nodes. The interference fit between the elongated holes and the locating pins effectively achieves rapid positioning and stable connection of the purlin during installation, avoiding construction errors and positional misalignment problems caused by traditional bolt-fastening methods. The purlin's cross-section and hole design have been rationally optimized, reducing the structural weight without compromising overall strength, adapting to the needs of roofs with spans of 5 to 15 meters.

[0022] The support components are preferably made of 6061-T6 aluminum alloy profiles with anodized surfaces to improve corrosion resistance and structural durability. The support components are designed as a three-tiered structure, with a height difference of 5mm between each tier, forming a trapezoidal cross-section with segmented heights. This allows the purlins to be adjusted in height according to the roof slope requirements during installation, and the roof load is evenly distributed to the main structure through a distributed support method, avoiding localized compression or deformation caused by concentrated stress. Each tier of the support component has a rubber damping pad with a Shore hardness of 60±5 at its bottom, effectively reducing the vibration transmission rate caused by wind loads, pedestrian movement, or equipment vibration. The vibration transmission rate reduction can reach over 70%, further improving the dynamic stability of the roof structure. Each support component has an individual load-bearing capacity of no less than 5kN, which can meet the high load requirements of large-span steel structure roofs.

[0023] The connection node, as a key connection between the main purlin and the supporting components, integrates a positioning pin and an anti-torsion groove. The positioning pin is preferably made of stainless steel and is fixedly positioned at the node. The size of the positioning pin is designed with an interference fit between it and the elongated hole in the purlin, with a clearance of no more than 0.05mm, preferably 0.03mm. This allows the purlin to be directly inserted and positioned during installation without external pressure, preventing permanent deformation of the purlin cross-section due to compression. The anti-torsion groove is located on the outside of the connection node, fitting against the side or folded edge of the purlin. It effectively restrains the purlin in the lateral and torsional directions after positioning, preventing rotation, tilting, or other instability caused by roof wind loads or external forces. The engagement clearance of the anti-torsion groove is also strictly controlled, with an embedded stainless steel self-lubricating bushing and a friction coefficient of less than 0.15. This ensures smooth installation and effectively prevents long-term wear at the connection, improving the reusability and service life of the connection node, with a repeatability accuracy better than ±0.1mm. The connection nodes as a whole can provide a torsional moment of more than 200 N·m, which significantly improves the overall torsional stiffness of the roof purlin system.

[0024] Furthermore, an intelligent monitoring system, including strain gauge sensors and a buzzer alarm, can be installed during actual implementation. The strain gauge sensors are fixedly installed in the main stress areas or key connection points of the purlins to collect real-time stress data during use. The sensors have a range of 0-50 MPa and a measurement accuracy of 0.1% FS, accurately reflecting the actual stress on the purlins. When the detected stress exceeds a preset threshold (e.g., 45 MPa), the buzzer alarm will automatically sound an audible and visual alarm, alerting on-site construction or maintenance personnel to conduct inspection and maintenance. The alarm system's response time is less than 1 second, thus achieving dynamic monitoring of the purlin system's safety status.

[0025] Taking the Dongshan 5GW high-efficiency monocrystalline silicon photovoltaic rooftop project as an example, during construction, the support components were first adjusted to the appropriate third-level height according to the roof slope, reaching a total height of 15mm. Rubber shock-absorbing pads were laid under the support components during installation to enhance vibration damping. Subsequently, the main purlins were laid sequentially according to the design positions, ensuring the elongated holes of the purlins were accurately aligned and inserted with the positioning pins on the connection nodes. After insertion, the edges of the purlins were inserted into anti-torsion slots for final fixation, eliminating the need for traditional manual hammering or bolt pre-tightening, thus avoiding purlin deformation and loose node connections. Throughout the installation process, the stress changes of the purlins were monitored in real time through a monitoring system. Test data after installation showed that the maximum stress of the purlins was 28.5MPa, far below the safety threshold of 45MPa, the vibration transmission rate was reduced to 28%, and the installation error of the photovoltaic bracket was controlled within 0.08mm. The overall construction efficiency was improved by approximately 40% compared to traditional methods, and subsequent use requires less frequent maintenance, significantly reducing maintenance costs.

[0026] In summary, this utility model achieves extrusion-free and high-precision installation of Z-shaped purlins across roofs, solving problems such as large installation errors, easy extrusion deformation, and difficult maintenance in traditional purlin connections. It has advantages such as reasonable structure, high construction efficiency, and stable performance, and is suitable for purlin laying systems of various large metal roofs, photovoltaic brackets, and steel structure buildings.

[0027] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A roof-spanning, non-compression Z-shaped purlin device, comprising a main purlin, a support assembly, and connecting nodes, characterized in that: The support component disperses the roof load through a segmented design and is located below the main purlin. The web of the main purlin has an elongated hole. The support component is fixed to the main purlin through a connecting node, which includes a positioning pin and an anti-torsion groove. The positioning pin is inserted into the elongated hole on the web of the main purlin and cooperates with the anti-torsion groove to limit the position of the main purlin and prevent torsion.

2. The roof-crossing, non-compression Z-shaped purlin device according to claim 1, characterized in that: The main purlin has a cross-sectional dimension of 200×80×12mm.

3. A roof-crossing, non-compression Z-shaped purlin device according to claim 1, characterized in that: The diameter of the oblong hole is 10-20 mm.

4. A roof-crossing, non-compression Z-shaped purlin device according to claim 1, characterized in that: The support component includes a multi-level stepped design, with a height difference of 5mm between each level and a load-bearing capacity of ≥5kN per level.

5. A roof-crossing, non-compression Z-shaped purlin device according to claim 1, characterized in that: The bottom of the support component is equipped with a rubber shock-absorbing pad with a Shore hardness of 60±5.

6. A roof-crossing, non-compression Z-shaped purlin device according to claim 4, characterized in that: The clearance between the anti-torsion groove and the positioning pin is ≤0.05mm.

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