A reinforcement structure and construction method for light steel structure roof purlin

Abstract

The invention relates to a reinforcement structure and construction method for a purlin of a light steel structure roof. The reinforcement structure comprises an original roof purlin, which is a C-shaped steel purlin; a purlin reinforcement plate, which is arranged at the bottom of the span of the C-shaped steel purlin and is fixedly connected to the web of the C-shaped steel purlin; a tensioning anchor, which is symmetrically installed at the two ends of the lower flange of the C-shaped steel purlin, and a through hole is reserved on the tensioning anchor along the length direction of the C-shaped steel purlin; a tensioning clamp, which is symmetrically arranged on the side of the tensioning anchor away from the end of the C-shaped steel purlin, and a tensioning screw is provided on the tensioning clamp, one end of the tensioning screw is connected and fixed to the tensioning clamp, and the other end is suitable for passing through the through hole and fixed by a nut; a prestressed tensioning bar, which is arranged on the lower surface of the purlin reinforcement plate, and its two ends are clamped and fixed to the tensioning clamp, so that prestress can be applied to the purlin reinforcement plate and the original roof purlin when being tensioned. The present invention can meet the bearing capacity and deformation requirements of the original roof purlins after the load is increased without dismantling the original structure, thereby ensuring the safety of the structure.

Description

Technical Field

[0001] The invention relates to the technical field of light steel structure buildings, in particular to a light steel structure roof, and specifically to a reinforcement structure and a construction method for a light steel structure roof purlin. Background Art

[0002] Light steel structures have been widely used in many construction fields such as industrial plants, warehouses, gymnasiums, etc. due to their many advantages such as light weight, low cost, fast construction period, energy saving and environmental protection, and high degree of industrialization. In the face of increasingly severe climate change, photovoltaic building integration is an efficient way to save energy and achieve low-carbon development. Adding photovoltaic systems on the roofs of existing buildings can make full use of solar energy resources.

[0003] At present, the number of new photovoltaic projects on existing roofs has increased sharply. The original simply supported C-shaped purlins on the roofs of many light steel buildings have limited load-bearing capacity and cannot meet the load-bearing requirements after the installation of photovoltaic systems. The commonly used methods of increasing the purlin cross-section, replacing the purlins or increasing the density of purlins require the demolition of the original roof structure and other structures, which requires a large amount of construction and high reinforcement costs. Summary of the invention

[0004] In view of the deficiencies in the prior art, the main purpose of the present invention is to provide a reinforcement structure for light steel structure roof purlins to solve the problem of insufficient bearing capacity of roof purlins after a photovoltaic system is installed on an existing light steel structure roof.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a reinforcement structure for a light steel structure roof purlin, comprising:

[0007] The original roof purlin is a C-shaped steel purlin, and both ends of the lower flange of the C-shaped steel purlin are fixed to the original roof steel beam;

[0008] A purlin reinforcement plate is arranged at the bottom of the span of the C-shaped steel purlin and is fixedly connected to the web of the C-shaped steel purlin;

[0009] A tensioning anchor is symmetrically installed at two ends of the lower flange of the C-shaped steel purlin, and a through hole is reserved on the tensioning anchor along the length direction of the C-shaped steel purlin;

[0010] A tensioning clamp is symmetrically arranged on the side of the tensioning anchor away from the end of the C-shaped steel purlin, and a tensioning screw is provided on the tensioning clamp, one end of the tensioning screw is connected and fixed to the tensioning clamp, and the other end is suitable for passing through the through hole and fixed by a nut;

[0011] The prestressed tensioning strip is arranged on the lower surface of the purlin reinforcement plate, and its two ends are clamped and fixed on the tensioning clamp, so that prestress can be applied to the purlin reinforcement plate and the original roof purlin when being tensioned.

[0012] In some embodiments, the purlin reinforcement plate is L-shaped, one of the panels of the L-shaped purlin reinforcement plate is tightly attached to the back of the C-shaped steel purlin web, and is connected and fixed to the C-shaped steel purlin by blind rivets, and the other panel is arranged in parallel just below the lower flange of the C-shaped steel purlin.

[0013] In some embodiments, the tension anchor is L-shaped, one panel of the L-shaped tension anchor is in close contact with the lower surface of the lower flange of the C-shaped steel purlin, and is fixed to the C-shaped steel purlin by bolts, and the other panel is vertically arranged along the side close to the original roof steel beam and the lower flange of the C-shaped steel purlin, and two through holes are reserved on the other panel.

[0014] In some embodiments, the tensioning fixture comprises:

[0015] An upper cover plate is arranged below the lower flange of the C-shaped steel purlin, a groove 1 is arranged at the bottom of the upper cover plate, and a plurality of vertical bolt holes are arranged along both sides of the groove 1;

[0016] A lower cover plate is arranged below the upper cover plate, and a groove 2 is provided at the top of the lower cover plate corresponding to the groove 1, and the same holes are provided along both sides of the groove 2 corresponding to the multiple vertical bolt holes, suitable for the groove 1 and the groove 2 to be oppositely buckled and placed to place the prestressed tensioning strip and then fastened by bolts passing through the corresponding holes, and two transverse threaded holes are provided at the bottom of the lower cover plate, and the through holes are provided correspondingly;

[0017] Two tensioning screw rods, one end of each tensioning screw rod is threadedly connected to one of the threaded holes, and the other end is suitable for passing through one of the through holes and being fixed by a nut, and the tensioning clamp is radially moved by rotating the nut to perform prestressed tensioning.

[0018] In some embodiments, the reinforcement structure of the light steel structure roof purlin also includes purlin connecting fasteners, and multiple C-shaped steel purlins are connected end to end. The purlin connecting fasteners are symmetrically arranged at the upper corners and lower corners on the inner sides of two adjacent C-shaped steel purlins, and are connected and fixed to the two adjacent C-shaped steel purlins by blind rivets.

[0019] In some embodiments, the purlin connecting fastener is tightly attached to the upper flange and upper 1 / 3 of the web of two adjacent C-shaped steel purlins or to the inner side of the lower flange and lower 1 / 3 of the web of two adjacent C-shaped steel purlins, and is connected and fixed to the flange and web of two adjacent C-shaped steel purlins by blind rivets.

[0020] In some embodiments, the reinforcement structure of the light steel structure roof purlin also includes a fixed pulley, which is symmetrically installed on the lower flange of the C-shaped steel purlin along one side of the tensioning clamp away from the end of the C-shaped steel purlin, and is suitable for passing through the prestressed tensioning strip.

[0021] In some embodiments, the fixed pulley is arranged along a side close to the mid-span of the C-shaped steel purlin to leave a distance between the fixed pulley and the tensioning clamp to facilitate the tensioning of the prestressed tensioning strip.

[0022] In some embodiments, a connecting plate is provided on the top of the fixed pulley, and a plurality of bolt holes are provided on the connecting plate. The same holes are opened on the lower flange of the C-shaped steel purlin corresponding to the plurality of bolt holes, which are suitable for connecting the fixed pulley and the C-shaped steel purlin by passing bolts through the corresponding holes.

[0023] In some embodiments, the prestressed tension strip is a prestressed carbon fiber plate.

[0024] A construction method for reinforcing the purlins of the light steel structure roof comprises the following steps:

[0025] S10: The purlin reinforcement plate is arranged at the bottom of the C-shaped steel purlin mid-span, and is fixedly connected to the C-shaped steel purlin web by blind rivets;

[0026] S20: Drill holes on site at both ends of the lower flange of the C-shaped steel purlin, and fix the tension anchor to the lower flange of the C-shaped steel purlin by bolts;

[0027] S30: Install tensioning clamps at both ends of the prestressed tensioning strip, and screw one end of the tensioning screw into the threaded hole of the tensioning clamp;

[0028] S40: Insert the other end of the tensioning screw into the through hole of the tensioning anchor and fix it with a nut, and then tension the prestressed tensioning strip by rotating the nut.

[0029] The beneficial effects of the present invention over the prior art are as follows: the present invention proposes a reinforcement structure for the roof purlins of a light steel structure, which is suitable for installing a photovoltaic system on an existing light steel structure roof. The reinforcement structure can be directly used for the roof purlins of an existing light steel structure without dismantling the original structure, greatly saving construction time and reinforcement costs, while improving the bearing capacity of the roof purlins and ensuring the safety of the roof structure after installing the photovoltaic system.

[0030] The present invention arranges the purlin reinforcement plate in the mid-span of the C-shaped steel purlin, which is the position where the C-shaped steel purlin bears the largest bending moment and is prone to bending deformation. The purlin reinforcement plate is arranged in the mid-span, which can effectively increase the section inertia moment of the original purlin, thereby improving its bending bearing capacity.

[0031] The present invention first fixes the end of the prestressed tensioning strip by a tensioning clamp, then passes the tensioning screw provided on the tensioning clamp through the through hole of the tensioning anchor and is initially fixed by a nut, and the tensioning clamp is forced to move radially by rotating the nut to tension the prestressed tensioning strip, thereby realizing jack-free prestressing. It not only simplifies the construction process, improves construction efficiency and engineering quality, but also reduces costs, enhances construction safety, and has the characteristics of strong adaptability and easy maintenance.

[0032] The present invention applies prestress to the whole formed by the purlin reinforcement plate and the original roof purlin through the prestressed tensioning strip, which can increase the bending rigidity of the light steel structure roof purlin and reduce its bending deformation.

[0033] The present invention strengthens the boundary conditions of the original roof purlins through purlin connection fasteners, and changes the simply supported purlins into continuous purlins. The continuous purlins have better stress-bearing performance than the simply supported purlins. When subjected to stress, the continuous purlins can distribute the load more evenly to each supporting point, thereby avoiding damage caused by excessive local stress.

[0034] It should be understood that the contents described in the Summary of the Invention section are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easy to understand through the following description. In addition, the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0036] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0037] Figure 1 It is a schematic diagram of the overall structure of a reinforcement structure of a light steel structure roof purlin of the present invention;

[0038] Figure 2 It is a schematic diagram of the connection between the C-shaped steel purlin, the purlin reinforcement plate and the purlin connecting fastener of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the purlin reinforcement plate of the present invention;

[0040] Figure 4 It is a schematic diagram of the tension anchor structure of the present invention;

[0041] Figure 5 It is a schematic diagram of the connection between the tension anchor and the tension clamp of the present invention;

[0042] Figure 6 It is a schematic diagram of the tensioning clamp structure of the present invention;

[0043] Figure 7 It is a schematic diagram of the purlin connection fastener structure of the present invention;

[0044] Figure 8 It is a schematic diagram of the fixed pulley structure of the present invention.

[0045] Markings in the figure:

[0046] 1-original roof purlin; 101-upper flange; 101a-upper flange curling; 102-lower flange; 102a-lower flange curling; 103-web;

[0047] 2-Purlin reinforcement plate;

[0048] 3-tensioning anchor; 301-drilling hole;

[0049] 4-tensioning fixture; 401-upper cover plate; 4011-groove 1; 402-lower cover plate; 4021-groove 2; 4022-threaded hole; 403-tensioning screw;

[0050] 5- Prestressed tension bars;

[0051] 6-Original roof steel beams;

[0052] 7-purlin connecting fastener; 701-long vertical steel plate; 702-short vertical steel plate; 703-transverse web;

[0053] 8-fixed pulley; 801-connecting plate;

[0054] 9-round hole; 10-bolt hole; 11-nut; 12-blind rivet; 13-bolt.

[0055] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0059] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device, component or structure must have a specific direction, be constructed or operate in a specific direction, and should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] The present invention proposes a reinforcement structure for light steel structure roof purlins, which is suitable for installing a photovoltaic system on an existing light steel structure roof. The reinforcement structure can improve the bearing capacity of the original roof purlins without dismantling the original light steel structure roof structure, thereby ensuring the safety of the roof structure after installing the photovoltaic system.

[0062] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0063] like Figures 1 to 8 As shown, the reinforcement structure includes original roof purlin 1, purlin reinforcement plate 2, tension anchor 3, tension clamp 4 and prestressed tension strip 5. The original roof purlin 1 is a C-shaped steel purlin, and the two ends of the C-shaped steel purlin are vertically mounted on the supporting original roof steel beam 6.

[0064] In the present invention, the C-shaped steel purlin is a conventional cross-sectional form used for purlins on existing light steel structure roofs. The C-shaped steel purlin includes an upper flange 101 (upper flange of the C-shaped steel purlin), a lower flange 102 (lower flange of the C-shaped steel purlin) arranged in parallel, and a web 103 arranged vertically between the upper flange 101 and the lower flange 102, and the upper flange 101 and the lower flange 102 are both located on the same side of the web 103, so that the purlin composed of the upper flange 1011, the lower flange 102 and the web 103 is similar to the letter "C" in cross section.

[0065] In one specific embodiment, see Figure 2 The outer edge of the upper flange 101 of the C-shaped steel purlin is vertically provided with an upper flange curling edge 101a bent inwardly. The outer edge of the lower flange 102 of the C-shaped steel purlin is vertically provided with a lower flange curling edge 102a bent inwardly.

[0066] See also Figure 1 The purlin reinforcement plate 2 is arranged at the bottom of the span of the original roof purlin 1, that is, the middle position of the lower flange 102 of the C-shaped steel purlin, and is fixedly connected to the web 103 of the C-shaped steel purlin. The bearing capacity of the original purlin span is strengthened. In the present invention, the span is the position where the original roof purlin 1 is subjected to the largest bending moment and is prone to bending deformation. Arranging a reinforcement plate in the span can effectively increase the section moment of inertia of the original purlin, thereby improving its bending bearing capacity.

[0067] The purlin reinforcement plate 2 of the present invention is the remaining part of the purlin of the same model as the C-shaped steel purlin after the upper flange is cut off.

[0068] See also Figure 2 , Figure 3The purlin reinforcement plate 2 is L-shaped. One of the panels of the L-shaped purlin reinforcement plate 2, such as the web of the L-shaped purlin reinforcement plate 2, is in close contact with the lower part of the back of the C-shaped steel purlin web 103, and a group of circular holes 9 are provided along the close contact part. The C-shaped steel purlin web 103 is provided with the same holes corresponding to the group of circular holes 9, which are suitable for connecting and fixing with the original roof purlin 1 through the corresponding holes through the blind rivets 12. The other panel of the L-shaped purlin reinforcement plate 2, such as the flange plate of the L-shaped purlin reinforcement plate, is arranged directly below the lower flange 102 of the C-shaped steel purlin. The main function of the purlin reinforcement plate 2 is to increase the cross-section of the original roof purlin 1 and improve the bearing capacity of the purlin. More specifically, the flange of the L-shaped purlin reinforcement plate 2 serves as the lower flange of the new structure (i.e., the overall structure of the original purlin and the reinforced purlin) after reinforcement, and the prestress is usually applied to the lower flange of the structure, so the prestressed tensioning rod 5 is installed at the lower flange of the new structure (i.e., the flange of the L-shaped purlin reinforcement plate).

[0069] In the present invention, the holes on the web or flange of the original roof purlin 1 are drilled on site according to construction needs.

[0070] In addition, the blind rivet connection refers to pulling the rivet core through a special rivet gun, so that the rivet body expands in the hole and fills the entire hole, thereby forming a strong connection. In this process, it is only necessary to operate from one side of the workpiece to be connected, and there is no need to rivet from both sides at the same time like traditional rivets. It is particularly suitable for the connection between the purlin reinforcement plate 2 of the present invention and the original C-shaped steel purlin web 103. The present invention uses a blind rivet 12 to achieve single-sided riveting, which is convenient for on-site construction.

[0071] In the present invention, since the purlin reinforcement plate 2 is of the same model as the C-shaped steel purlin, they are highly consistent in size and shape. This allows the purlin reinforcement plate 2 to easily match the C-shaped steel purlin without additional adaptation or adjustment, thereby simplifying the installation process. In addition, since the purlin reinforcement plate 2 has the same cross-sectional width as the C-shaped steel purlin, no large eccentricity will be generated when applying prestress and subsequently bearing loads.

[0072] Continue to see Figure 1, the tensioning anchor 3 is symmetrically installed at the two ends of the lower flange 102 of the C-shaped steel purlin, that is, it is set close to the original roof steel beam 6. The tensioning anchor 3 is provided with a through hole 301 along the length direction of the C-shaped steel purlin, which is used to fix the tensioning clamp 4 and tension the prestressed tensioning strip 5. The tensioning clamp 4 is symmetrically arranged on the side of the tensioning anchor 3 away from the end of the C-shaped steel purlin, such as the bottom of the tensioning anchor 3. A tensioning screw 403 is provided on the tensioning clamp 4, one end of the tensioning screw 403 is connected and fixed to the tensioning clamp 4, and the other end is suitable for passing through the through hole 301 and fixed by the nut 11. The prestressed tensioning strip 5 is arranged on the lower surface of the purlin reinforcement plate 2, and its two ends are clamped and fixed to the tensioning clamp 4, which can apply prestress to the purlin reinforcement plate 2 when being tensioned, thereby improving the bearing capacity of the original roof purlin 1.

[0073] The tensioning clamp 4 of the present invention is used to clamp and fix the prestressed tensioning strip 5, and in combination with the tensioning anchor 3, tension the prestressed tensioning strip 5 to pre-adjust the stress state of the C-shaped steel purlin, enhance the bending stiffness and bearing capacity of the purlin, and enable it to better maintain its shape and stability under load. More specifically, the main functions of the prestressed tensioning strip 5 are: (1) to improve the bending bearing capacity of the structure (light steel structure roof purlin) (2) to improve the bending stiffness of the structure and reduce structural deformation.

[0074] In some embodiments, see Figure 1 One side of the tensioning anchor 3 is in close contact with the lower flange 102 of the C-shaped steel purlin, and a bolt hole 10 is reserved along the close contact position. The lower flange 102 of the C-shaped steel purlin is provided with the same hole corresponding to the bolt hole 10, which is suitable for bolting and fixing the tensioning anchor 3 to the lower flange 102 of the C-shaped steel purlin by passing the bolt 13 through the corresponding hole. The other side of the tensioning anchor 3 is directly opposite to the tensioning screw 403 of the tensioning clamp 4, and a through hole 301 is reserved corresponding to the tensioning screw 403, and the diameter of the through hole 301 is slightly larger than the diameter of the tensioning screw 403, which is suitable for passing the other end of the tensioning screw 403 and preliminarily fixing it with the nut 11. It is easy to understand that the preliminary fixation here refers to temporary fixation, and the prestressed tensioning strip 5 needs to be tensioned later by turning the nut 11.

[0075] See also Figure 4 , Figure 5 The tension anchor 3 is L-shaped, one of the panels of the L-shaped tension anchor 3 is in close contact with the lower surface of the lower flange 102 of the C-shaped steel purlin, and a group of bolt holes 10 are reserved along the close contact position. The lower flange 102 of the C-shaped steel purlin is provided with the same holes corresponding to the bolt holes 10, which are suitable for bolts 13 to pass through the corresponding holes and be bolted and fixed to the lower flange 102 of the C-shaped steel purlin. The other panel of the L-shaped tension anchor 3 is vertically arranged with the lower flange 102 of the C-shaped steel purlin along the side close to the original roof steel beam 6, and at least two through holes 301 are opened along the length direction of the C-shaped steel purlin.

[0076] In a specific embodiment, two through holes 301 are provided on the tensioning anchor 3, and the two through holes 301 are arranged side by side at the same height. Two tensioning screws 403 are provided on the tensioning anchor 3. The tensioning screws 403 are symmetrically arranged on the tensioning anchor 3, and can prevent the rotation of the tensioning clamp 4 by the pressure of the through holes 301, thereby ensuring that the tensioning clamp 4 only moves radially.

[0077] See also Figure 5 , Figure 6 The tensioning clamp 4 is arranged directly below the tensioning anchor 3. The tensioning clamp 4 is connected to the tensioning anchor 3 by the tensioning screw 403 and fixed by the nut 11. The tensioning clamp 4 can be driven by the tensioning screw 403 to move toward the nut 11 along the length direction of the tensioning screw 403 on the lower surface of the tensioning anchor 3 according to the rotation of the nut 11. Since the prestressed tensioning strip 5 is fixed on the tensioning clamp 4, the prestressed tensioning strip 5 can be driven to perform prestressing during the movement of the tensioning clamp 4.

[0078] The tensioning fixture 4 includes an upper cover plate 401, a lower cover plate 402 and a tensioning screw 403. The upper cover plate 401 is arranged on the lower surface of the lower flange 102 of the C-shaped steel purlin, and a groove 1 4011 is arranged at the bottom of the upper cover plate 401 along the length direction of the C-shaped steel purlin. The lower cover plate 402 is arranged below the upper cover plate 401, and a groove 2 4021 is arranged at the top of the lower cover plate 402 corresponding to the groove 1 4011. The groove 1 4011 and the groove 2 4021 are oppositely buckled to form a rectangular groove when the upper cover plate 401 and the lower cover plate 402 are tightly attached, which is suitable for placing the prestressed tensioning strip 5 and is fastened by bolts 13.

[0079] Continue to see Figure 6 The upper cover plate 401 is provided with a plurality of vertical bolt holes 10 along both sides of the groove 1 4011, and the lower cover plate 402 is provided with the same holes along both sides of the groove 2 4021 corresponding to the plurality of vertical bolt holes 10, which are suitable for fastening the upper cover plate 401 and the lower cover plate 402 by passing the bolts 13 through the corresponding holes, that is, fixing the prestressed tensioning strip 5 in the rectangular groove.

[0080] In some embodiments, adhesive is applied inside the groove 1 4011 and the groove 2 4021 , which is suitable for further tightening the prestressed tensioning strip 5 .

[0081] Continue to see Figure 4 The bottom of the lower cover plate 402 is provided with at least two threaded holes 4022 along the length direction of the lower flange 102 of the C-shaped steel purlin. In the present invention, two threaded holes 4022 arranged side by side are preferably provided along the length direction of the lower flange 102 of the C-shaped steel purlin, suitable for threaded connection of two tensioning screws 403.

[0082] One end of the tensioning screw rod 403 is threadedly connected to the threaded hole 4022, and the other end is suitable for passing through the through hole 301 of the tensioning anchor 3 and being initially fixed by the nut 11. In the subsequent use process, the tensioning clamp 4 is forced to move radially by rotating the nut 11 to stretch the prestressed tensioning strip 5.

[0083] When the tensioning clamp of the present invention is used, adhesive is first applied to the grooves of the upper and lower cover plates, then the upper and lower cover plates are pressed and bolts are passed through corresponding holes to fix the upper and lower cover plates, and finally the tensioning screw is screwed into the threaded hole.

[0084] The present invention realizes jack-free prestressed tensioning by connecting the tensioning anchor and the tensioning clamp through a tensioning screw and fixing them through a nut. This not only simplifies the construction process, improves construction efficiency and project quality, but also reduces costs, enhances construction safety, and has the characteristics of strong adaptability and easy maintenance.

[0085] In some embodiments, the prestressed tensioning bar 5 is a prestressed carbon fiber plate (prestressed carbon plate) having a certain length. In the present invention, the length of the prestressed tensioning bar 5 is adapted to the length of each C-shaped steel purlin.

[0086] The low density of carbon fiber itself makes the overall weight of prestressed carbon plate relatively light. In reinforcement engineering, the use of prestressed carbon plate can reduce the additional load on the original structure and avoid secondary damage caused by reinforcement. At the same time, as an active reinforcement material, prestressed carbon plate can effectively alleviate the stress concentration phenomenon in the structure and improve the stress state of the structure through the pre-applied tensile stress.

[0087] In some embodiments, see Figure 1 The reinforcement structure of the light steel structure roof purlin proposed in the present invention also includes a fixed pulley 8. The fixed pulley 8 is symmetrically installed on the lower flange 102 of the C-shaped steel purlin along the tensioning fixture 4 away from the end of the original roof purlin 1, and is suitable for passing through the prestressed tensioning strip 5. The setting of the fixed pulley 8 makes it easier for the prestressed tensioning strip 5 to pass through and apply tension in a specific direction, thereby reducing the loss of prestress during the tensioning process of the prestressed tensioning strip 5. More specifically, the function of the fixed pulley 8 is mainly to enable the prestress to be applied in the horizontal direction, prevent the prestressed tensioning strip 5 from bending at the tensioning fixture 4, and facilitate the application of prestress.

[0088] Continue to see Figure 1 The fixed pulley 8 of the present invention is arranged along one side close to the mid-span of the original roof purlin 1, so as to leave a distance between the fixed pulley 8 and the tensioning clamp 4 to facilitate the tensioning of the prestressed tensioning strip 5.

[0089] See also Figure 8A connecting plate 801 is provided on the top of the fixed pulley 8, and a plurality of bolt holes 10 are provided on the connecting plate 801. The same holes are opened on the lower flange 102 of the C-shaped steel purlin corresponding to the plurality of bolt holes 10, and the fixed pulley 8 and the C-shaped steel purlin are connected by bolts 13 passing through the corresponding holes. The bolt connection method makes the installation and disassembly process simpler and faster. At the same time, it allows construction personnel to install the fixed pulley 8 in the best position according to actual needs to optimize the reinforcement effect.

[0090] In some embodiments, the fixed pulley 8 is a steel fixed pulley.

[0091] In some embodiments, the original roof purlin 1 includes a plurality of C-shaped steel purlins arranged in parallel and connected end to end. Since both ends of each C-shaped steel purlin on the original roof purlin are connected and fixed to the original roof steel beam 6 through a purlin support plate, the boundary conditions of the original roof purlin present typical simply supported purlin characteristics.

[0092] Based on the above problems, the present invention provides a purlin connecting fastener 7 between two adjacent C-shaped steel purlins. Figure 1 , Figure 2 The purlin connecting fastener 7 is symmetrically embedded in the upper corner and the lower corner of the inner side of two adjacent C-shaped steel purlins, and the purlin connecting fastener 7 is connected and fixed to the two adjacent C-shaped steel purlins through the blind rivet 12.

[0093] The purlin connecting fastener 7 of the present invention changes the simply supported purlin of the original roof purlin into a continuous purlin. Under the action of load, the negative bending moment of the support generated has an unloading effect on the positive bending moment in the mid-span, that is, it can redistribute the internal force of the purlin, making its internal force state more reasonable and improving the bending bearing capacity.

[0094] See also Figure 7 The purlin connecting fastener 7 includes a long vertical steel plate 701, a short vertical steel plate 702 and a transverse web 703, wherein the transverse web 703 is arranged between the long vertical steel plate 701 and the short vertical steel plate 702, and connects the long vertical steel plate 701 and the short vertical steel plate 702 along the same side.

[0095] See also Figure 2The purlin connecting fastener 7 is embedded in the upper corner and the lower corner of the inner side of two adjacent C-shaped steel purlins. Specifically, the purlin connecting fastener 7 is arranged at the lower corner part of the inner side of two adjacent C-shaped steel purlins. The long vertical steel plate 701 of the purlin connecting fastener 7 is tightly attached to the lower inner surface of the web 103 of the two adjacent C-shaped steel purlins, the transverse web 703 is tightly attached to the inner surface of the lower flange 102 of the two adjacent C-shaped steel purlins, and the short vertical steel plate 702 is tightly attached to the inner surface of the lower flange curling edge 102a of the two adjacent C-shaped steel purlins. Circular holes 9 are reserved on the long vertical steel plate 701 and the short vertical steel plate 702. The long vertical steel plate 701 is connected to the web 103 of the two adjacent C-shaped steel purlins by passing the corresponding circular holes 9 with the core-pulling rivets 12, and the short vertical steel plate 702 is connected to the lower flange curling edge 102a of the two adjacent C-shaped steel purlins by passing the corresponding circular holes 9 with the core-pulling rivets 12.

[0096] In the present invention, the connection method of the purlin connecting fastener 7 arranged at the upper corner portion inside two adjacent C-shaped steel purlins is exactly the same as the connection method at the lower corner portion described above, and the present invention will not be repeated or elaborated here.

[0097] The present invention uses a blind rivet 12 to pass through the circular hole 9 reserved in the purlin connecting fastener 7 and the circular hole 9 drilled on-site in the flange and web of the C-shaped steel purlin to achieve single-sided riveting, which is convenient for on-site construction;

[0098] In a specific embodiment, one of the purlin connecting fasteners 7 is in close contact with the inner sides of the upper flanges 101 and the upper 1 / 3 of the web 103 of two adjacent C-shaped steel purlins, and is connected by a blind rivet 12. Another purlin connecting fastener 7 is in close contact with the inner sides of the lower flanges 102 and the lower 1 / 3 of the web 103 of two adjacent C-shaped steel purlins, and is connected by a blind rivet 12.

[0099] The present invention also provides a construction method for reinforcing the purlins of a light steel structure roof, comprising the following steps:

[0100] S10: The purlin reinforcement plate 2 is arranged at the bottom of the original roof purlin 1 in the middle of the span, and connected to the C-shaped steel purlin web 103 through the blind rivets 12;

[0101] S20: drilling holes on both ends of the lower flange 102 of the C-shaped steel purlin on site, and fixing the tension anchor 3 to the lower flange 102 of the C-shaped steel purlin by bolts 13;

[0102] S30: Install the tensioning fixture 4 at both ends of the prestressed tensioning strip 5, and screw one end of the tensioning screw 403 into the threaded hole 4022 of the tensioning fixture 4;

[0103] S40: insert the other end of the tensioning screw rod 403 into the through hole 301 of the tensioning anchor 3 and fix it with the nut 11, and then tension the prestressed tensioning strip 5 by rotating the nut 11.

[0104] In some embodiments, step S10 also includes tightly fitting the purlin connecting fastener 7 to the inner sides of the flanges and webs of two adjacent C-shaped steel purlins, then punching holes on the flange curling and webs of the C-shaped steel purlins on site, and connecting them with blind rivets 12.

[0105] In some embodiments, step S20 further includes drilling holes on site at a position of the lower flange 102 of the C-shaped steel purlin away from the tension anchor 3 and close to the mid-span, and fixing the fixed pulley 8 to the lower flange 102 of the C-shaped steel purlin by bolts 13 .

[0106] This construction method has the advantages of easy installation, reliable connection, significant reinforcement effect, easy adjustment and maintenance, and can significantly improve the bearing capacity and stability of the light steel structure roof.

[0107] At this point, those skilled in the art should recognize that, although the exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

[0108] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A reinforcement structure for a light steel structure roof purlin, characterized in that: include: The original roof purlin is a C-shaped steel purlin, and both ends of the lower flange of the C-shaped steel purlin are fixed to the original roof steel beam; A purlin reinforcement plate is arranged at the bottom of the C-shaped steel purlin mid-span and is fixedly connected to the C-shaped steel purlin web; The tension anchor is symmetrically installed at the two ends of the lower flange of the C-shaped steel purlin, and a through hole is reserved on the tension anchor along the length direction of the C-shaped steel purlin; the tension anchor is L-shaped, and one panel of the L-shaped tension anchor is tightly attached to the lower surface of the lower flange of the C-shaped steel purlin, and is connected and fixed to the C-shaped steel purlin by bolts, and the other panel is vertically arranged along the side close to the original roof steel beam and the lower flange of the C-shaped steel purlin, and two through holes are reserved on the other panel; A tensioning clamp is symmetrically arranged on the side of the tensioning anchor away from the end of the C-shaped steel purlin. The tensioning clamp is provided with a tensioning screw, one end of which is connected and fixed to the tensioning clamp, and the other end is suitable for passing through the through hole and fixed by a nut; the tensioning clamp includes: An upper cover plate is arranged below the lower flange of the C-shaped steel purlin, a groove 1 is arranged at the bottom of the upper cover plate, and a plurality of vertical bolt holes are arranged along both sides of the groove 1; A lower cover plate is arranged below the upper cover plate, and a groove 2 is provided at the top of the lower cover plate corresponding to the groove 1, and the same holes are provided along both sides of the groove 2 corresponding to the multiple vertical bolt holes, suitable for the groove 1 and the groove 2 to be oppositely buckled and placed to place the prestressed tensioning strip and then fastened by bolts passing through the corresponding holes, and two transverse threaded holes are provided at the bottom of the lower cover plate, and the through holes are provided correspondingly; Two tensioning screws, one end of each tensioning screw is threadedly connected to one of the threaded holes, and the other end is suitable for passing through one of the through holes and being fixed by a nut, and the tensioning clamp is radially moved by rotating the nut to perform prestressing; The prestressed tensioning strip is arranged on the lower surface of the purlin reinforcement plate, and its two ends are clamped and fixed on the tensioning clamp, so that prestress can be applied to the purlin reinforcement plate and the original roof purlin when being tensioned.

2. The reinforcement structure of the light steel structure roof purlin according to claim 1 is characterized in that: The purlin reinforcement plate is L-shaped, one of the panels of the L-shaped purlin reinforcement plate is in close contact with the back of the C-shaped steel purlin web and is connected and fixed to the C-shaped steel purlin by blind rivets, and the other panel is arranged in parallel just below the lower flange of the C-shaped steel purlin.

3. The reinforcement structure of the light steel structure roof purlin according to claim 1 is characterized in that: The reinforcement structure of the light steel structure roof purlin also includes purlin connecting fasteners. A plurality of C-shaped steel purlins are connected end to end. The purlin connecting fasteners are symmetrically arranged at the upper corners and lower corners on the inner sides of two adjacent C-shaped steel purlins, and are connected and fixed to the two adjacent C-shaped steel purlins by blind rivets.

4. The reinforcement structure of the light steel structure roof purlin according to claim 3 is characterized in that: The purlin connecting fastener is tightly attached to the upper flange and 1 / 3 of the web of two adjacent C-shaped steel purlins or to the inner side of the lower flange and lower 1 / 3 of the web of two adjacent C-shaped steel purlins, and is connected and fixed to the flange and web of two adjacent C-shaped steel purlins by blind rivets.

5. The reinforcement structure of the light steel structure roof purlin according to claim 1 is characterized in that: The reinforcement structure of the light steel structure roof purlin also includes a fixed pulley, which is symmetrically installed on the lower flange of the C-shaped steel purlin along one side of the tensioning clamp away from the end of the C-shaped steel purlin and is suitable for passing through the prestressed tensioning strip.

6. The reinforcement structure of the light steel structure roof purlin according to claim 5 is characterized in that: The fixed pulley is arranged along one side close to the mid-span of the C-shaped steel purlin, so as to leave a distance between the fixed pulley and the tensioning clamp to facilitate the tensioning of the prestressed tensioning strip.

7. The reinforcement structure of the light steel structure roof purlin according to claim 5, characterized in that: A connecting plate is provided on the top of the fixed pulley, and a plurality of bolt holes are provided on the connecting plate. The same holes are opened on the lower flange of the C-shaped steel purlin corresponding to the plurality of bolt holes, which are suitable for connecting the fixed pulley and the C-shaped steel purlin by passing bolts through the corresponding holes.

8. The reinforcement structure of the light steel structure roof purlin according to claim 1, characterized in that: The prestressed tensioning strip is a prestressed carbon fiber plate.

9. A construction method for reinforcing the purlin of a light steel structure roof according to any one of claims 1 to 8, characterized in that: The steps include: S10: The purlin reinforcement plate is arranged at the bottom of the C-shaped steel purlin mid-span, and is fixedly connected to the C-shaped steel purlin web by blind rivets; S20: Drill holes on site at both ends of the lower flange of the C-shaped steel purlin, and fix the tension anchor to the lower flange of the C-shaped steel purlin by bolts; S30: Install tensioning clamps at both ends of the prestressed tensioning strip, and screw one end of the tensioning screw into the threaded hole of the tensioning clamp; S40: Insert the other end of the tensioning screw into the through hole of the tensioning anchor and fix it with a nut, and then tension the prestressed tensioning strip by rotating the nut.

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