Spider-web type cable-bracing reinforcement system for large-span flat roof structure and construction method thereof

Abstract

The present application belongs to the field of building structure reinforcement, and discloses a spider-web type cable-braced reinforcement system for large-span plane roof structure, which is mainly used to solve the problem of poor lateral stability of the existing cable-braced reinforcement system structure. The present application adopts a central cross type cable-braced structure, so that each down cable can jointly bear stress, and the overall load resistance of the cable-braced system is significantly improved. Meanwhile, the present application forms a closed stress ring between the horizontal ring cables and / or the inclined ring cables pulled between the ring struts, which cooperates with the down cables to form a spider-web type cable-braced reinforcement system, so that each ring strut can be mutually restrained, and the lateral instability resistance and support stability of the cable-braced reinforcement system are further improved. The present application also discloses a construction method of the above spider-web type cable-braced reinforcement system, which does not damage the original roof building structure, and can be used for reinforcement construction without affecting the normal use of the existing building, greatly reducing the construction difficulty.

Description

Technical Field

[0001] This invention belongs to the field of building structure reinforcement, specifically, it relates to a spider web-type cable bracing reinforcement system for large-span planar roof structures and its construction method. Background Technology

[0002] Large-span floor and roof structures, due to their large span, typically employ large-span spatial steel structures (most commonly flat space frame structures) and prestressed concrete structures. For large-span floor or roof structures, when their load-bearing capacity is insufficient due to defects in the initial architectural design or subsequent damage, reinforcing the existing floor or roof structure requires a very high cost, mainly reflected in:

[0003] 1. For large-span spatial steel structures and space frame structures, when the load-bearing capacity of structural members is insufficient, the problem is usually solved by welding to increase the stress-bearing cross section. However, this solution usually requires unloading the roof structure to ensure the safety of the construction process (according to Chapter 6 of the "Standard for Strengthening Design of Steel Structures" GB51367-2019). However, existing buildings often do not have the conditions for unloading during normal use, so the implementation of this solution is quite difficult.

[0004] In addition, there is another reinforcement method for this type of structure, namely the overall prestressed reinforcement method. This method involves the tensioning of prestressed cables. However, the implementation of this method is greatly affected by the construction method and is very prone to construction accidents due to tension instability. Furthermore, the out-of-plane lateral stability problem of the prestressed cables in this reinforcement scheme is prominent. The reinforcement system is extremely susceptible to the influence of lateral forces. If not handled properly, it will affect the reinforcement effect and cause safety accidents. At present, no clear solution has been found for this problem.

[0005] 2. For large-span concrete structures, this type of structure typically employs a grid-shaped or prestressed reinforced concrete beam roof. Especially for prestressed structures, due to the high tensile stress levels within the prestressed tendons and the large span of individual beams (20-30m), conventional reinforcement methods such as increasing the cross-section, external steel cladding, and steel plate bonding are not applicable (according to the "Code for Design of Strengthening Concrete Structures" GB50367-2013). Aside from adding supports at mid-span, there are currently no suitable reinforcement methods for this type of structure with insufficient load-bearing capacity. However, the space requirements for large spans usually prohibit adding supports at mid-span of the roof, resulting in a lack of suitable reinforcement methods for this type of structure.

[0006] To address the aforementioned problems, this invention proposes a reinforcement system similar to a tensioned beam structure to reinforce existing floors or roofs. However, traditional tensioned beam structures are typically only suitable for arched roof structures. For planar roof structures such as flat space frames or large-span concrete roofs, the load-bearing cables and struts in the tensioned beam structure are easily affected by lateral forces, leading to lateral instability of the supporting structure and affecting the use of the reinforced structure.

[0007] Therefore, it is necessary to optimize the traditional tensioned beam support structure, change its support force distribution mode, and solve its lateral stability problem. Summary of the Invention

[0008] The purpose of this invention is to provide a spiderweb-type cable-stayed reinforcement system for large-span planar roof structures, aiming to solve the problem of poor lateral stability in existing cable-stayed reinforcement systems.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A spiderweb-type cable-stayed reinforcement system for large-span planar roof structures includes a roof body, several down-stayed cables, and several struts. The down-stayed cables are concave and pulled below the roof body. The struts are installed between the roof body and the down-stayed cables. The roof body is supported by side columns. The down-stayed cables are arranged in a centrally intersecting pattern, and both ends of the down-stayed cables are connected to the side columns. The struts include a central strut and several circumferential struts. The central strut is installed vertically at the central intersection of the down-stayed cables. The circumferential struts are installed vertically around the central strut in a circular radial pattern on the down-stayed cables. Horizontal circumferential cables are sequentially pulled between the circumferential struts in the same ring, or diagonal circumferential cables are sequentially pulled between the circumferential struts in the same ring, or horizontal and diagonal circumferential cables are sequentially pulled between the circumferential struts in the same ring simultaneously.

[0011] As a further preferred embodiment of the above technical solution, the upper end of the strut is connected to the roof body through a roof connection part, and the roof connection part is detachably connected to the strut; the roof connection part includes a plurality of centrally symmetrical and horizontally arranged opening and closing clamps, and the opening and closing clamps are sleeved on the roof beam members in the roof body; a locking block adapted to the shape and size of the roof beam members in the roof body is locked in the opening and closing clamps.

[0012] As a further preferred embodiment of the above technical solution, a plurality of through slots are provided on the support rod along the pulling direction of the plurality of pull cables, and the plurality of through slots are arranged vertically; a fixed pulley is installed in the through slot along the pulling direction of the pull cables, and the pull cables pass through the through slots and slide in cooperation with the fixed pulleys.

[0013] As a further preferred embodiment of the above technical solution, a cable limiting structure is installed on the cable at both ends corresponding to the through groove through which it passes, and the cable limiting structure is detachably connected to the cable.

[0014] As a further preferred embodiment of the above technical solution, the pull-down cable limiting structure includes two opening and closing cable sleeves adapted to the pull-down cable, and the two opening and closing cable sleeves are respectively sleeved on the pull-down cable at both ends of the through groove; two connecting plates are symmetrically arranged on the opening and closing cable sleeves, and the connecting plates are perpendicular to the axis of the opening and closing cable sleeves; the connecting plates on the two opening and closing cable sleeves at both ends of the through groove are connected by long bolts.

[0015] As a further preferred embodiment of the above technical solution, the central support rod is multi-segmented, with at least one pull cable passing through each segment of the central support rod, and adjacent segments of the central support rod are detachably connected; adjacent segments of the central support rod are connected by flanges, and matching arc-shaped bolt connection grooves are provided on the corresponding flanges.

[0016] As a further preferred embodiment of the above technical solution, all horizontal circumferential cables pulled between the circumferential struts of the same ring are in the same horizontal plane, and the two ends of a single horizontal circumferential cable are respectively connected to two adjacent circumferential struts.

[0017] As a further preferred embodiment of the above technical solution, one end of a single inclined circumferential cable is connected to the upper end of one of the two adjacent circumferential struts, and the other end is connected to the lower end of the other of the two adjacent circumferential struts; two inclined circumferential cables are pulled between the two adjacent circumferential struts in a cross configuration.

[0018] This invention also provides a construction method based on the above-mentioned spiderweb-type cable bracing reinforcement system, comprising the following steps:

[0019] S1: Install anchor supports on the corresponding side columns; connect the central strut and circumferential strut to the corresponding roof beam members of the roof body;

[0020] S2: The lower cables are hoisted and pulled in sequence. First, one end of the lower cable is connected to a certain anchor support. Then, the other end is passed through the corresponding circumferential strut and the central strut in sequence and connected to another corresponding anchor support. After all the lower cables are pulled, the lower cables are tensioned by the tensioner on the lower cables, but no preload is applied.

[0021] S3: After all the down cables are tensioned in place, the horizontal circumferential cables and / or the inclined circumferential cables are hoisted and pulled in sequence, and the two ends of each horizontal circumferential cable and / or the inclined circumferential cable are connected to the lifting lugs on the corresponding circumferential struts; after all the horizontal circumferential cables and / or the inclined circumferential cables are pulled, the tensioners on each horizontal circumferential cable and / or the inclined circumferential cable are tensioned.

[0022] S4: After all horizontal circumferential cables and / or inclined circumferential cables are tensioned in place, the lower cables are further tensioned by the tensioners on the lower cables to apply appropriate preload to the lower cables;

[0023] S5: After each cable is tensioned, install cable limiting structures on each cable at both ends corresponding to the through slots it passes through.

[0024] As a further preferred embodiment of the above technical solution, in step S1, the connection step between the central support rod and the circumferential support rod includes:

[0025] S11: Select a central strut and a circumferential strut with the same number of opening and closing clamps based on the number of roof beam members to be connected at a single connection point;

[0026] S12: Select a matching clip according to the outer diameter of the roof beam member to be connected, and engage the clip on the roof beam member accordingly;

[0027] S13: Disassemble all the opening and closing clamps at the upper end of the central support rod and the circumferential support rod into two halves, and fit them one by one onto each clamp block. Finally, connect and fix the two halves of the clamps together.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] First, the cable-stayed reinforcement system of this invention draws inspiration from traditional tensioned beam support structures, employing a centrally intersecting cable-stayed structure. A central strut is installed at the central intersection of the cable-stayed system to connect all the downstay cables, enabling them to share the load. This significantly improves the overall load-bearing capacity of the cable-stayed system and prevents lateral instability in a single downstay cable. Simultaneously, this invention also incorporates horizontal circumferential cables and / or diagonal circumferential cables pulling between the circumferential struts. These horizontal and / or diagonal cables, together with the centrally intersecting downstay cables, form a spiderweb-like cable-stayed reinforcement system. This system creates closed force loops between the circumferential struts of the same ring, allowing the circumferential struts of the same ring to restrain each other. When a downstay cable bears a lateral load, the external load can be offset by the horizontal and / or diagonal circumferential cables, preventing lateral displacement of the downstay cable and giving this cable-stayed reinforcement system better support stability.

[0030] Secondly, the cable-stayed reinforcement system of this invention is mainly used for the reinforcement of large-span floor or roof structures in existing buildings. Compared with traditional reinforcement methods that require component welding and other hot reinforcement methods, the mechanical support-based cold treatment reinforcement method adopted by this invention will not cause degradation of the overall structural load-bearing capacity due to local heating of the main roof structure, nor will it weaken the structural strength of the original roof building. At the same time, this invention does not require full-span auxiliary support or unloading of the existing roof building structure during construction reinforcement, realizing structural reinforcement construction without affecting the normal use of the existing building, greatly reducing the construction difficulty. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the overall front structure of the present invention;

[0033] Figure 2 This is a schematic diagram of a cable-stayed reinforcement system structure in one embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of a cable-stayed reinforcement system structure in another embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the central strut in one embodiment of the present invention;

[0036] Figure 5 This is an enlarged schematic diagram of the structure at the lower end of the central support rod of the present invention.

[0037] Figure 6 This is a schematic diagram of the structure of a circumferential strut in one embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the installation structure of the central support rod in one embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the installation structure of the circumferential strut in one embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the installation of the cable limiting structure in one embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the cable limiting structure in one embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the card block structure in one embodiment of the present invention.

[0043] Among them, 1-roof body, 2-pull cable, 3-strut, 301-central strut, 302-circumferential strut, 4-side column, 5-horizontal circumferential cable, 6-diagonal circumferential cable, 7-opening clamp, 8-clamp, 9-fixed pulley, 10-opening cable sleeve, 11-connecting plate, 12-long bolt, 13-bolt connection hole, 14-reinforcing sleeve, 15-flange, 16-arc bolt connection groove, 17-lifting lug, 18-anchor support. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] like Figures 1 to 3 As shown, this embodiment provides a spiderweb-type cable-stayed reinforcement system for a large-span planar roof structure, including a roof body 1, several pull cables 2, and several struts 3. The pull cables 2 are concave and pulled below the roof body 1. The struts 3 are installed between the roof body 1 and the pull cables 2. The roof body 1 is supported by side columns 4. The pull cables 2 are arranged in a centrally crisscross pattern, and both ends of the pull cables 2 are connected to the side columns 4. The struts 3 include a central strut 301 and several circumferential struts. 302, the central support rod 301 is vertically installed at the central intersection of several pull-down cables 2, and several circumferential support rods 302 are vertically installed on the pull-down cables 2 in a ring-like radial pattern around the central support rod 301; horizontal circumferential cables 5 are sequentially pulled between the circumferential support rods 302 in the same ring and at least one ring, or diagonal circumferential cables 6 are sequentially pulled between the circumferential support rods 302 in the same ring and at least one ring, or horizontal circumferential cables 5 and diagonal circumferential cables 6 are sequentially pulled between the circumferential support rods 302 in the same ring and at least one ring.

[0047] In this embodiment, as Figure 2 As shown, a horizontal circumferential cable 5 and a diagonal circumferential cable 6 are simultaneously stretched between the innermost circumferential struts 302. Of course, in more embodiments, such as... Figure 3 As shown, the number of circumferential cable turns can be appropriately increased according to the actual reinforcement scenario to further improve the support strength and stability of this cable-stayed system.

[0048] Specifically, it also includes an anchor support 18, which is installed at the top of the side post 4. The two ends of the pull cable 2 are pulled and connected to the anchor support 18. The anchor support 18 is an existing product on the market, which usually includes a "U"-shaped or sleeve-shaped fixing plate. The fixing plate is fixedly sleeved on the side post 4 by anchor bolts. Hooks or annular lugs are provided on the fixing plate. The end of the pull cable 2 is directly hooked onto the hooks or annular lugs.

[0049] In this embodiment, the downward load force on the roof body 1 is transferred to the downstay cable 2 through the strut 3. The downstay cable 2 then transfers the force to the vertical side columns 4 at both ends through tension. Traditional tensioned beam structures usually bear the tension through the beam ends of the transverse roof beams. The reason for this arrangement in this embodiment is that this embodiment is mainly used for the reinforcement of existing roof building structures. The roof body 1 may have insufficient load-bearing capacity. If the downstay cable 2 is insisted to be connected to the roof beam in the roof body 1, it will increase the load on the roof body 1 itself and easily cause structural collapse. Therefore, in this embodiment, the tension point of the downstay cable 2 is transferred to the more stable side columns 4 to minimize the load impact on the roof body 1.

[0050] On the other hand, such as Figure 6 As shown, a plurality of lugs 17 are provided on the circumferential strut 302. Both ends of the horizontal circumferential cable 5 and the inclined circumferential cable 6 are connected to the lugs 17. In this embodiment, the horizontal circumferential cable 5 is pulled close to the lower end of the circumferential strut 302. All horizontal circumferential cables 5 pulled between the same circumferential strut 302 are in the same horizontal plane. The two ends of a single horizontal circumferential cable 5 are respectively connected to two adjacent circumferential struts 302. One end of a single inclined circumferential cable 6 is connected to the upper end of one of the two adjacent circumferential struts 302, and the other end is connected to the lower end of the other of the two adjacent circumferential struts 302. Two inclined circumferential cables 6 are pulled between two adjacent circumferential struts 302 in a cross pattern.

[0051] When the cable-stayed reinforcement system resists loads, both sides of a single circumferential strut 302 can be subjected to the tension of the horizontal circumferential cable 5 and the inclined circumferential cable 6. The fully closed force ring can offset the external lateral loads and prevent them from displacing laterally, which can significantly improve the support stability of the structural system.

[0052] In this embodiment, tensioners (not shown in the figure) are installed at both ends of the pull cable 2, the horizontal circumferential cable 5, and the inclined circumferential cable 6. After the pull cable 2, the horizontal circumferential cable 5, and the inclined circumferential cable 6 are pulled, they are tensioned by the tensioners installed on them. The tensioners are existing products on the market, such as mechanical thread tensioners and hydraulic cable tensioners. Their function is to contract simultaneously from both ends of the cable, so that the cable is in a state of tension.

[0053] It should be noted that the number of pull cables 2 and the struts 3, the degree of concavity of the pull cables 2, and the spacing of the struts 3 in this embodiment need to be reasonably configured according to the span of the target roof structure, the characteristics of the roof beam structure, and the load-bearing requirements. The specific determination method involves structural analysis and stress detection of the target roof structure. However, how to calculate the various setting parameters in this technical solution based on the existing roof building structure is not the focus of the technology that this invention wants to protect, so it will not be elaborated here.

[0054] For planar roof structures, traditional cable-stayed systems typically involve individual cable supports for each roof beam. The problem with this is that individual cables and struts under a single roof beam are susceptible to lateral loads, which can lead to out-of-plane instability. For planar roofs, lateral displacement of the load-bearing plane causes the direction of the resultant force of the cable supports to be the same as the direction of the out-of-plane displacement. In other words, the resultant force of the cable supports will continuously increase the deviation of the load-bearing plane, thus having a significant impact on the cable-stayed system.

[0055] Based on the above considerations, the spiderweb-style cable-stayed reinforcement system provided in this embodiment starts from the overall reinforcement concept of the planar roof structure. It sets up centrally intersecting downstay cables 2, and uses a central strut 301 to connect all downstay cables at the central intersection, allowing the downstay cables 2 to share the load. This significantly improves the overall load-bearing capacity of the cable-stayed system and prevents lateral instability of a single downstay cable 2. Simultaneously, this embodiment also simultaneously pulls horizontal circumferential cables 5 and diagonal circumferential cables 6 between the circumferential struts 302, which, together with the downstay cables 2, form... The spiderweb-type cable bracing reinforcement system consists of horizontal circumferential cables 5 forming a closed force-bearing ring on the horizontal plane between circumferential struts 302 of the same ring, and inclined circumferential cables 6 forming a closed force-bearing ring on the vertical plane between circumferential struts 302 of the same ring. Under the aforementioned bidirectional closed force action, the circumferential struts 302 of the same ring restrain each other, and the external load can be offset by the horizontal circumferential cables 5 and the inclined circumferential cables 6, preventing lateral displacement of the downstay cables when bearing lateral loads, thus giving this cable bracing reinforcement system better support stability.

[0056] Example 2

[0057] like Figures 4 to 9As shown, on the one hand, in order to adapt to the planar steel frame roof structure, the spider web cable bracing reinforcement system provided in this embodiment adopts the following connection node between the strut and the roof body: the upper end of the strut 3 is connected to the roof body 1 through the roof connecting part, and the roof connecting part is detachably connected to the strut 3; the roof connecting part includes a number of centrally symmetrical and horizontally arranged opening and closing clamps 7, the opening and closing clamps 7 are sleeved on the roof beam members in the roof body 1, and the number of opening and closing clamps 7 is determined according to the number of roof beam members at the connection point between the roof body 1 and the strut 3.

[0058] Specifically, see Figure 4 and Figure 6 In this embodiment, the roof connection part is connected to the support rod 3 by flange bolts, and several of the opening and closing clamps 7 are welded to the flange in the roof connection part by connecting bars; the opening and closing clamp 7 is composed of two semi-circular grooves joined together, and the two sides of the two semi-circular grooves are connected by several bolts. When installing the opening and closing clamp 7, it is necessary to first disassemble it into two halves, then fit them one by one onto the roof beam members, and finally connect and fix the two halves of the clamp.

[0059] Furthermore, see Figure 7 The hinged clamp 7 is fitted with a locking block 8 that matches the shape and size of the roof beam members in the roof body. In this embodiment, for example... Figure 11 As shown, the locking block 8 is a two-part type. A slot adapted to the roof beam member is provided in the middle of the locking block 8. During installation, the locking block 8 is first disassembled and correspondingly locked onto the roof beam member, and then the opening and closing clamp 7 is fitted onto the locking block 8.

[0060] The function of the locking block 8 is to improve the applicability and standardized production of the roof connection. For roof beam members of different specifications, it is only necessary to select the locking block 8 that is compatible with them, instead of customizing the roof connection with the same opening and closing clamp 7. This is more conducive to the unified manufacturing of parts and saves production costs.

[0061] Of course, in more embodiments, in order to adapt to different types of planar roof structures, the structure of the connection node between the strut and the roof body can be adjusted accordingly to ensure the connection stability between the strut 3 and the roof body 1. For example, when the target planar roof structure is a concrete structure roof, the strut 3 and the concrete roof beam can be directly fixedly connected by anchor bolts.

[0062] On the other hand, such as Figures 4 to 9As shown, the strut-cable connection node used in this embodiment is as follows: several through slots are provided on the strut 3 along the pulling direction of several cables 2, and the several through slots are arranged vertically; a fixed pulley 9 is installed in the through slot along the pulling direction of the cable 2, and the cable 2 passes through the through slot and slides with the fixed pulley 9.

[0063] The connection between the strut 3 and the cable 2 is mainly achieved through a sliding engagement between the fixed pulley 9 inside the strut 3 and the cable 2. The fixed pulley 9 reduces the friction between the cable 2 and the strut 3 when tensioned or under load, saving effort and reducing wear on the cable 2, thus extending its service life. Simultaneously, the sliding connection of the strut-cable connection is combined with the fixed connection of the strut-roof body connection. Compared to the traditional method where both upper and lower connection nodes are hinged, this dynamic-static combination is more conducive to maintaining the verticality of the strut 3. When the strut 3 bears a large load, the cable 2 can automatically adjust the position of the load-bearing point through relative sliding with the fixed pulley 9, preventing the strut 3 from tilting under load and ensuring stable vertical force transmission.

[0064] The key feature of this embodiment is that the strut 3 is fixedly connected to the roof body 1, while the strut 3 and the pulley 2 are slidably connected. In contrast, in traditional tensioned beam structures, the struts at both ends are hinged, resulting in a relatively fixed load-bearing point between the strut and the pulley. Adjusting the verticality of the strut 3 requires controlling the tension at both ends of the pulley to rotate it relative to the vertical plane, which is overly complex and difficult to achieve precision in practice. In this embodiment, the pulley 2 and the fixed pulley 9 can slide relative to each other, allowing the load-bearing point between the strut and the pulley to change freely. This avoids the strut 3 being affected by the tension of the pulley 2, enabling the strut 3 to automatically maintain a vertical position.

[0065] Example 3

[0066] like Figure 7 , Figure 9 , Figure 10 As shown, cable limiting structures are installed on both ends of the cable 2 corresponding to the through slot it passes through. The cable limiting structures are detachably connected to the cable 2. The cable limiting structures are used to limit and fix the cable 2 after it is pulled and tensioned and a preload is applied, so as to prevent it from displaced and loosened under long-term stress and improve its stress stability.

[0067] Specifically, the pull-down cable limiting structure includes two opening and closing cable sleeves 10 adapted to the pull-down cable 2. The two opening and closing cable sleeves 10 are respectively sleeved on the pull-down cable 2 at both ends of the through groove. In this embodiment, the opening and closing cable sleeve 10 is composed of two semi-circular sleeves joined together, and the two semi-circular sleeves are connected by bolts. Two connecting plates 11 are symmetrically arranged on the opening and closing cable sleeve 10, and the connecting plates 11 are perpendicular to the axis of the opening and closing cable sleeve 10. The connecting plates 11 on the two opening and closing cable sleeves 10 at both ends of the through groove are connected by long bolts 12. Multiple bolt connection holes 13 are provided on the connecting plates, and the bolt connection holes 13 on the connecting plates 11 at both ends of the through groove correspond one-to-one.

[0068] During installation, the opening and closing cable sleeve 10 in the cable limiting structure is first split into two halves, and then the two halves are fitted onto the cable 2 located at both ends of the through groove. The two halves of the opening and closing cable sleeve 10 are then connected and fixed. Subsequently, according to the size specifications of the central support rod 301 and the circumferential support rod 302, the appropriate bolt connection holes 13 are selected on the connecting plate 11, and the connecting plates 11 on the two opening and closing cable sleeves 10 located at both ends of the through groove are connected by long bolts 12.

[0069] The cable limiting structure in this embodiment can uniformly limit and fix the cable 2 located at both ends of the through groove, so as to ensure that the cable 2 at both ends of the through groove has a consistent limiting effect and ensures the stability of the force between the cable 2 and the fixed pulley 9.

[0070] Example 4

[0071] like Figures 4 to 9 As shown, this embodiment is a further supplement to embodiment 2 above. A reinforcing sleeve 14 is fitted on the support rod 3 corresponding to the slotted area of ​​the through groove. The reinforcing sleeve 14 has a through hole corresponding to the through groove. The reinforcing sleeve 14 is to improve the structural strength of the support rod 3 itself. If there are many pull cables 2 that need to be pulled, multiple through grooves need to be opened on the support rod 3, which will inevitably affect its own strength. Therefore, the reinforcing sleeve 14 is added to improve the structural strength of the support rod 3 in this area, extend its service life, and reduce the later maintenance cost.

[0072] Example 5

[0073] like Figure 4 , Figure 5 , Figure 7As shown, this embodiment is a further supplement to the above embodiment 2. The central support rod 301 is multi-segmented, and at least one pull cable 2 passes through each segment of the central support rod 301. The two adjacent segments of the central support rod 301 are detachably connected. Specifically, the two adjacent segments of the central support rod 301 are connected by flanges 15, and the two corresponding flanges 15 are provided with matching arc-shaped bolt connection grooves 16.

[0074] The purpose of setting up a multi-segment central strut 301 is to allow the relative direction of the through slots on the central strut 301 to be adjusted by a small range of relative rotation between the segments of the central strut 301, thereby compensating for the deviation in the tension direction of the pull cables 2. This is because when designing a cable-stayed reinforcement system for the target planar roof structure, it cannot be guaranteed that the tension direction of all pull cables 2 corresponds one-to-one with the direction of the through slots on the central strut 301. Therefore, in order to avoid customizing a unique central strut 301, the central strut 301 is set as a multi-segment adjustable type. The direction of the through slots on each segment is adjusted by fine-tuning the connection angle between adjacent segments of the central strut 301 to adapt to the unique planar roof structure.

[0075] It should be noted that the main difference between the central support rod 301 and the circumferential support rod 302 in this application lies in the number of pull cables 2 passing through them. Specifically, all pull cables 2 pass through the central support rod 301, while only one pull cable 2 passes through the circumferential support rod 302. Therefore, conventionally, the central support rod 301 needs to have multiple through slots, while the circumferential support rod 302 only needs a single through slot. However, to improve the versatility of the support rods 3, this application sets the central support rod 301 and the circumferential support rod 302 to have the same structure, but the circumferential support rod 302 only needs to retain the section of the central support rod 301 connected to the roof connection part. During installation, the remaining lower section is removed, such as... Figure 6 and Figure 7 As shown.

[0076] Example 6

[0077] This embodiment provides a construction method based on the above-mentioned spiderweb-type cable bracing reinforcement system, including the following steps:

[0078] S1: Install anchor supports on the corresponding side columns; connect the central strut and circumferential strut to the corresponding roof beam members of the roof body;

[0079] S2: The lower cables are hoisted and pulled in sequence. First, one end of the lower cable is connected to a certain anchor support. Then, the other end is passed through the corresponding circumferential strut and the central strut in sequence and connected to another corresponding anchor support. After all the lower cables are pulled, the lower cables are tensioned by the tensioner on the lower cables, but no preload is applied.

[0080] S3: After all the down cables are tensioned in place, hoist and pull the horizontal circumferential cables and the inclined circumferential cables in sequence, and connect the two ends of each horizontal circumferential cable and the inclined circumferential cable to the lifting lugs on the corresponding circumferential struts; after all the horizontal circumferential cables and the inclined circumferential cables are pulled, tension each horizontal circumferential cable and the inclined circumferential cable through the tensioners on each horizontal circumferential cable and the inclined circumferential cable;

[0081] S4: After all the horizontal circumferential cables and the inclined circumferential cables are tensioned in place, the lower cables are further tensioned by the tensioners on the lower cables to apply appropriate preload to the lower cables;

[0082] S5: After each cable is tensioned, install cable limiting structures on each cable at both ends corresponding to the through slots it passes through.

[0083] In this embodiment, the connection step between the central strut and the circumferential strut in step S1 includes:

[0084] S11: Select a central strut and a circumferential strut with the same number of opening and closing clamps based on the number of roof beam members to be connected at a single connection point;

[0085] S12: Select a matching clip according to the outer diameter of the roof beam member to be connected, and engage the clip on the roof beam member accordingly;

[0086] S13: Disassemble all the opening and closing clamps at the upper end of the central support rod and the circumferential support rod into two halves, and fit them one by one onto each clamp block. Finally, connect and fix the two halves of the clamps together.

[0087] In this embodiment, when the pull cables are passed through the central support rod in step S2, if there is a deviation between the pulling direction of the pull cables and the direction of the through groove they need to pass through, the relative direction of the through groove on the single central support rod is adjusted by twisting the multi-segment central support rod.

[0088] In this embodiment, the installation step of the pull-down cable limiting structure in step S5 includes:

[0089] S51: The opening and closing cable sleeve in the cable limiting structure is split into two halves, and the two halves are fitted onto the cable at both ends of the through groove. The two halves of the opening and closing cable sleeve are then connected and fixed.

[0090] S52: Select appropriate bolt connection holes on the connecting plate according to the size specifications of the central strut or circumferential strut, and connect the connecting plates on the two opening and closing cable sleeves located at both ends of the through groove with long bolts.

[0091] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spiderweb-type cable-stayed reinforcement system for a large-span planar roof structure, comprising a roof body (1), a plurality of down-stayed cables (2) and a plurality of struts (3), wherein the down-stayed cables (2) are concave and pulled below the roof body (1), and the struts (3) are installed between the roof body (1) and the down-stayed cables (2), characterized in that: The roof body (1) is supported by side columns (4). Several pull cables (2) are arranged in a central cross pattern, and the two ends of the pull cables (2) are connected to the side columns (4). The strut (3) includes a central strut (301) and several circumferential struts (302). The central strut (301) is vertically installed at the central cross position of several pull cables (2). Several circumferential struts (302) are arranged in a ring-shaped radial pattern around the central strut (301) and vertically installed on the pull cables (2). Horizontal circumferential cables (5) are sequentially pulled between the circumferential struts (302) of the same ring and at least one ring, or diagonal circumferential cables (6) are sequentially pulled between the circumferential struts (302) of the same ring and at least one ring, or horizontal circumferential cables (5) and diagonal circumferential cables (6) are sequentially pulled between the circumferential struts (302) of the same ring and at least one ring.

2. The spiderweb-type cable-stayed reinforcement system according to claim 1, characterized in that, The upper end of the strut (3) is connected to the roof body (1) through the roof connection part, and the roof connection part is detachably connected to the strut (3); the roof connection part includes a number of centrally symmetrical and horizontally arranged opening and closing clamps (7), and the opening and closing clamps (7) are sleeved on the roof beam members in the roof body (1); a clamp (8) that matches the shape and size of the roof beam members in the roof body (1) is clamped in the opening and closing clamps (7).

3. The spiderweb-type cable-stayed reinforcement system according to claim 1, characterized in that, A plurality of through slots are provided on the support rod (3) in the direction of the pulling of the pull cables (2), and the plurality of through slots are arranged vertically; a fixed pulley (9) is installed in the through slot in the direction of the pulling of the pull cables (2), and the pull cables (2) pass through the through slots and slide with the fixed pulley (9).

4. The spiderweb-type cable-stayed reinforcement system according to claim 3, characterized in that, A cable limiting structure is installed on the cable (2) at both ends corresponding to the through slot through which it passes, and the cable limiting structure is detachably connected to the cable (2).

5. The spiderweb-type cable-stayed reinforcement system according to claim 4, characterized in that, The cable limiting structure includes two opening and closing cable sleeves (10) adapted to the cable (2). The two opening and closing cable sleeves (10) are respectively sleeved on the cable (2) at both ends of the through groove. Two connecting plates (11) are symmetrically arranged on the opening and closing cable sleeves (10). The connecting plates (11) are perpendicular to the axis of the opening and closing cable sleeves (10). The connecting plates (11) on the two opening and closing cable sleeves (10) at both ends of the through groove are connected by long bolts (12).

6. The spiderweb-type cable-stayed reinforcement system according to claim 3, characterized in that, The central strut (301) is multi-segmented, with at least one pull cable (2) passing through each segment of the central strut (301). The two adjacent segments of the central strut (301) are detachably connected. The two adjacent segments of the central strut (301) are connected by flanges (15), and the two corresponding flanges (15) are provided with matching arc-shaped bolt connection grooves (16).

7. The spiderweb-type cable-stayed reinforcement system according to claim 1, characterized in that, All horizontal circumferential cables (5) pulled between the circumferential struts (302) of the same ring are in the same horizontal plane, and the two ends of a single horizontal circumferential cable (5) are respectively connected to two adjacent circumferential struts (302).

8. The spiderweb-type cable-stayed reinforcement system according to claim 1, characterized in that, One end of a single inclined circumferential cable (6) is connected to the upper end of one of the two adjacent circumferential struts (302), and the other end is connected to the lower end of the other of the two adjacent circumferential struts (302); two inclined circumferential cables (6) are pulled between the two adjacent circumferential struts (302) in a cross pattern.

9. A construction method for the spiderweb-type cable-stayed reinforcement system based on any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Install anchor supports on the corresponding side columns; connect the central strut and circumferential strut to the corresponding roof beam members of the roof body; S2: The lower cable is hoisted and pulled in sequence. First, one end of the lower cable is connected to a certain anchor support. Then, the other end is passed through the corresponding circumferential strut and the central strut in sequence and connected to another corresponding anchor support. After all the down cables have been pulled, tension them using the tensioners on the down cables, but do not apply any preload. S3: After all the pull cables are tensioned in place, hoist and pull the horizontal circumferential cables and / or the inclined circumferential cables in sequence, and connect the two ends of each horizontal circumferential cable and / or the inclined circumferential cable to the lifting lugs on the corresponding circumferential struts; After all horizontal circumferential cables and / or inclined circumferential cables have been pulled, each horizontal circumferential cable and / or inclined circumferential cable is tensioned using tensioners on each cable. S4: After all horizontal circumferential cables and / or inclined circumferential cables are tensioned in place, the lower cables are further tensioned by the tensioners on the lower cables to apply appropriate preload to the lower cables; S5: After each cable is tensioned, install cable limiting structures on each cable at both ends corresponding to the through slots it passes through.

10. The construction method according to claim 9, characterized in that, In step S1, the connection steps between the central strut and the circumferential strut include: S11: Select a central strut and a circumferential strut with the same number of opening and closing clamps based on the number of roof beam members to be connected at a single connection point; S12: Select a matching clip according to the outer diameter of the roof beam member to be connected, and engage the clip on the roof beam member accordingly; S13: Disassemble all the opening and closing clamps at the upper end of the central support rod and the circumferential support rod into two halves, and fit them one by one onto each clamp block. Finally, connect and fix the two halves of the clamps together.

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