Cobweb type cable support reinforcing system for large-span plane roof structure and construction method of cobweb type cable support reinforcing system

Abstract

The invention belongs to the field of building structure reinforcing, discloses a cobweb type cable support reinforcing system for a large-span plane roof structure, and mainly aims at solving the problem that an existing cable support reinforcing system structure is poor in lateral stability. The center-crossed cable support structure is adopted, so that all the lower inhaul cables can be jointly stressed, and the overall load resistance of the cable support system is remarkably improved; meanwhile, closed stress rings are formed between the horizontal annular cables and / or the inclined pull annular cables pulled between the annular supporting rods, the closed stress rings are matched with the lower pull cables to form a cobweb type cable support reinforcing system, all the annular supporting rods can be mutually restrained, and the lateral instability resistance and the supporting stability of the cable support reinforcing system are further improved. The invention further discloses a construction method of the cobweb type cable support reinforcing system, according to the method, an original roof building structure cannot be damaged, reinforcing construction can be conducted under the condition that normal use of an existing building is not affected, and the construction difficulty is reduced to a great extent.

Description

Technical Field

[0001] The present invention belongs to the field of building structure reinforcement, and in particular relates to a spider-web type cable-bracing reinforcement system for a large-span flat roof structure and a construction method thereof. Background Art

[0002] Due to their large span, large-span floor and roof structures usually adopt large-span spatial steel structures (the most widely used is flat grid structure) and prestressed concrete structures. For large-span floor or roof structures, when their own bearing capacity is insufficient due to defects in the early architectural design or damage to the roof structure, it is very costly to reinforce the existing floor or roof structure, which is mainly reflected in: 1. For large-span spatial steel structures and grid structures, when the bearing capacity of structural members is insufficient, welding is usually used to increase the load-bearing section of the connection to solve the problem. However, this solution usually requires unloading the roof structure to ensure the safety of the construction process (according to the requirements of Chapter 6 of the "Steel Structure Reinforcement Design Standard" GB51367-2019). However, existing buildings often do not have the conditions for unloading during normal use, so the implementation of this solution is relatively difficult.

[0003] In addition, there is another reinforcement method for this type of structure, namely the overall structural prestressed reinforcement method. This method involves the tensioning of prestressed cables, but the implementation of this method is greatly affected by the construction method, and it is very easy for construction accidents to occur due to tensioning instability during construction; in addition, the lateral stability problem outside the plane of the prestressed cables of this reinforcement scheme is prominent, and 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. No clear solution has been found for this at present.

[0004] 2. For large-span concrete structures, this type of structure typically utilizes a crisscross or prestressed reinforced concrete beam roof. Prestressed structures, in particular, are not suitable for conventional reinforcement methods such as increasing cross-sections, encapsulating steel sections, and attaching steel plates, due to the high tensile stress levels within the prestressed tendons and the large spans of individual beams (20-30m) (according to the "Code for Reinforcement Design of Concrete Structures" GB50367-2013). Aside from adding support points mid-span, there are currently no suitable reinforcement methods to address the insufficient bearing capacity of this type of structure. However, due to the spatial requirements of large spans, adding support points mid-span is generally not permitted, resulting in a lack of reinforcement methods for this type of structure.

[0005] To address the above issues, the present invention envisions using a reinforcement system similar to a beam string structure to reinforce existing floors or roofs. However, because traditional beam string structures are generally only suitable for upward-arched roof structures, for flat roof structures such as flat grid structures or large-span concrete roofs, the load-bearing cables and struts in the beam string structure are easily affected by lateral forces, which can cause lateral instability in the supporting structure and affect the use of the reinforcement structure.

[0006] Therefore, it is necessary to optimize the traditional beam string support structure, change its support force mode, and solve its lateral stability problem. Summary of the Invention

[0007] The object of the present invention is to provide a spider-web type cable-bracing reinforcement system for a large-span flat roof structure, aiming to solve the problem of poor lateral stability of the existing cable-bracing reinforcement system.

[0008] To achieve the above object, the present invention provides the following technical solutions: The spider-web-type cable-support reinforcement system for a large-span flat roof structure comprises a roof body, a plurality of lower cables and a plurality of struts, wherein the lower cables are pulled in a concave shape below the roof body, and the struts are installed between the roof body and the lower cables, and the roof body is supported by side columns. The plurality of lower cables are arranged in a center-crossing manner, and the two ends of the lower cables are connected to the side columns; the struts comprise a central strut and a plurality of circumferential struts, wherein the central strut is vertically installed at the center-crossing position of the plurality of lower cables, and the plurality of circumferential struts are vertically installed on the lower cables in a ring-shaped radial pattern around the central strut; horizontal circumferential cables are sequentially pulled between the circumferential struts of the same ring and at least one ring, or oblique circumferential cables are sequentially pulled between the circumferential struts of the same ring and at least one ring, or horizontal circumferential cables and oblique circumferential cables are sequentially pulled between the circumferential struts of the same ring and at least one ring.

[0009] As a further preferred embodiment of the above technical solution, the upper end of the support rod is connected to the roof body through a roof connecting part, and the roof connecting part is detachably connected to the support rod; the roof connecting 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 rod in the roof body; a clamping block that is adapted to the shape and size of the roof beam rod in the roof body is clamped in the opening and closing clamp.

[0010] As a further preferred embodiment of the above technical solution, a plurality of through grooves are provided on the support rod corresponding to the pulling direction of the plurality of lower pull cables, and the plurality of through grooves are provided up and down; a fixed pulley is installed in the through groove along the pulling direction of the lower pull cable, and the lower pull cable passes through the through groove and slides with the fixed pulley.

[0011] As a further preferred embodiment of the above technical solution, a lower cable limiting structure is installed on the lower cable at both ends corresponding to the through slot through which the lower cable passes, and the lower cable limiting structure is detachably connected to the lower cable.

[0012] As a further preference of the above technical solution, the lower pull rope limiting structure includes two opening and closing rope loops adapted to the lower pull rope, and the two opening and closing rope loops are respectively arranged on the lower pull rope at both ends of the through slot; two connecting plates are symmetrically arranged on the opening and closing rope loop, and the connecting plates are perpendicular to the axis of the opening and closing rope loop; the connecting plates on the two opening and closing rope loops located at both ends of the through slot are connected by long bolts.

[0013] As a further preference of the above technical solution, the center strut is multi-section, each section of the center strut has at least one pull-down rope passing through it, and the two adjacent sections of the center strut are detachably connected; the two adjacent sections of the center strut are connected by a flange, and corresponding arc-shaped bolt connection grooves are provided on the two correspondingly connected flanges.

[0014] As a further preferred embodiment of the above technical solution, all horizontal annular cables pulled between the annular struts in the same ring are in the same horizontal plane, and both ends of a single horizontal annular cable are respectively connected to two adjacent annular struts.

[0015] As a further preferred embodiment of the above technical solution, one end of a single oblique ring-shaped cable is connected to the upper end of one of the two adjacent ring-shaped struts, and the other end is connected to the lower end of the other of the two adjacent ring-shaped struts; two cross-type oblique ring-shaped cables are pulled between the two adjacent ring-shaped struts.

[0016] The present invention also provides a construction method based on the spider web type cable support reinforcement system, comprising the following steps: S1: Install anchor supports on the corresponding side columns; connect the center brace and the ring brace to the corresponding roof beams of the roof truss. S2: Hoist and pull the lower cables one by one, first connect one end of the lower cable to a certain anchor support, then pass the other end through the corresponding circumferential strut and the central strut in sequence and connect to another corresponding anchor support; after all the lower cables are pulled, tension the lower cables through the tensioner on the lower cables, but do not apply pre-tension; S3: After all the lower cables are tensioned, the horizontal ring cables and / or the oblique ring cables are hoisted and pulled in sequence, and the two ends of each horizontal ring cable and / or the oblique ring cable are connected to the lifting ears on the corresponding ring support rods; after all the horizontal ring cables and / or the oblique ring cables are pulled, each horizontal ring cable and / or the oblique ring cable is tensioned by the tensioner on each horizontal ring cable and / or the oblique ring cable; S4: After all horizontal hoop cables and / or diagonal hoop cables are tensioned in place, the lower cables are further tensioned by the tensioner on the lower cables to apply appropriate pre-tension to the lower cables; S5: After the tensioning of each lower cable is completed, a lower cable limiting structure is installed on each lower cable at both ends corresponding to the through slot through which the lower cable passes.

[0017] As a further preferred embodiment of the above technical solution, in step S1, the step of connecting the central struts and the annular struts includes: S11: Select the center brace and the ring brace with the same number of retractable clamps according to the number of roof beams required to be connected at a single connection point; S12: Selecting a clamping block with a size matching the outer diameter of the roof beam member to be connected, and clamping the clamping block onto the roof beam member; S13: Split all the retractable clamps at the upper ends of the central support rod and the annular support rod into two halves, and sleeve them on each clamping block in a one-to-one correspondence, and finally connect and fix the two halves of the clamps.

[0018] Compared with the prior art, the present invention has the following beneficial effects: First, the cable support reinforcement system of the present invention draws on the traditional tensioned beam support structure, adopts a center cross cable support structure, and installs a center support rod at the center cross position of the cable support system to link all the lower cables, so that the lower cables can be jointly stressed, which significantly improves the overall load resistance of the cable support system and prevents the lateral instability of a single lower cable; at the same time, the present invention also has horizontal annular cables and / or oblique annular cables pulled between the annular supports, and the horizontal annular cables and / or oblique annular cables cooperate with the center cross lower cables to form a spider web cable support reinforcement system, which can form a closed force ring between the annular supports in the same ring, so that the annular supports in the same ring restrain each other. When the lower cable is subjected to lateral load, under the action of the horizontal annular cables and / or oblique annular cables, the external load can be offset by the horizontal annular cables and / or oblique annular cables, avoiding lateral displacement of the lower cable, so that the cable support reinforcement system has better support stability.

[0019] Secondly, the cable-support reinforcement system of the present invention is mainly used for reinforcing large-span floor or roof structures in existing buildings. Compared with the traditional reinforcement method which requires thermal reinforcement methods such as component welding, the mechanically supported cold treatment reinforcement method adopted by the present invention will not cause the degradation of the bearing performance of the structure due to local heating of the main structure of the roof, nor will it weaken the structural strength of the original roof building. At the same time, the present invention does not require full-floor auxiliary support or unloading of the existing roof building structure during construction reinforcement, thereby realizing structural reinforcement construction without affecting the normal use of the existing building, greatly reducing the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 Schematic diagram of a cable-support reinforcement system structure in an embodiment of the present invention; Figure 3 is a schematic diagram of a cable-support reinforcement system structure in another embodiment of the present invention; Figure 4 A schematic structural diagram of a central support rod in an embodiment of the present invention; Figure 5 This is an enlarged schematic diagram of the structure of the through groove at the lower end of the center support rod of the present invention; Figure 6 Schematic diagram of the structure of the annular support rod in an embodiment of the present invention; Figure 7 Schematic diagram of the installation structure of the central support rod in one embodiment of the present invention; Figure 8 Schematic diagram of the installation structure of the circumferential support rod in an embodiment of the present invention: Figure 9 This is a schematic diagram of the installation of a lower cable limiting structure in a certain embodiment of the present invention; Figure 10 Schematic diagram of a lower cable limiting structure in an embodiment of the present invention; Figure 11 Schematic diagram of the structure of a card block in an embodiment of the present invention.

[0021] Among them, 1-roof body, 2-lower cable, 3-strut, 301-center strut, 302-circumferential strut, 4-side column, 5-horizontal circumferential cable, 6-oblique circumferential cable, 7-opening and closing clamp, 8-block, 9-fixed pulley, 10-opening and closing cable sleeve, 11-connecting plate, 12-long bolt, 13-bolt connection hole, 14-reinforcement sleeve, 15-flange, 16-arc-shaped bolt connection groove, 17-lifting ear, 18-anchor support. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1 like Figures 1 to 3 As shown, this embodiment provides a spider-web type cable-support reinforcement system for a large-span flat roof structure, comprising a roof body 1, a plurality of lower cables 2 and a plurality of struts 3, wherein the lower cables 2 are pulled in a concave shape below the roof body 1, and the struts 3 are installed between the roof body 1 and the lower cables 2. The roof body 1 is supported by side columns 4, and the plurality of lower cables 2 are arranged in a central cross-type arrangement, and the two ends of the lower cables 2 are connected to the side columns 4; the struts 3 include a central strut 301 and a plurality of circumferential struts 302, the central strut 301 is vertically installed at the central intersection position of several lower cables 2, and several annular struts 302 are vertically installed on the lower cables 2 in a ring-shaped radial shape around the central strut 301; the horizontal annular cables 5 are pulled in sequence between the annular struts 302 in the same ring and at least one ring, or the oblique annular cables 6 are pulled in sequence between the annular struts 302 in the same ring and at least one ring, or the horizontal annular cables 5 and the oblique annular cables 6 are pulled in sequence and at the same time between the annular struts 302 in the same ring and at least one ring.

[0024] In this embodiment, if Figure 2 As shown, the horizontal hoop cables 5 and the oblique hoop cables 6 are pulled simultaneously between the hoop braces 302 of the innermost ring. Figure 3 As shown, the number of pulling circles of the circumferential cable can be appropriately increased according to the actual reinforcement scenario to further improve the supporting strength and stability of the cable support system.

[0025] Specifically, it also includes an anchor support 18, which is installed at the top position of the side column 4, and the two ends of the lower 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, and the fixing plate is fixedly mounted on the side column 4 by an anchor bolt. A hook or an annular hanging ear is provided on the fixing plate, and the end of the lower pull cable 2 is directly hung on the hook or the annular hanging ear.

[0026] In this embodiment, the downward load force exerted on the roof body 1 is transferred to the lower cable 2 through the support rod 3, and the lower cable 2 then transfers the force to the vertical side columns 4 at both ends by tension. The traditional tension-string structure usually bears the tension by the beam ends of the transverse roof beams. The reason for this arrangement of this embodiment is that this embodiment is mainly used for reinforcing the existing roof building structure, and its roof body 1 may have insufficient bearing capacity. If the lower cable 2 is insisted on being connected to the roof beam in the roof body 1, the self-load force of the roof body 1 will be increased, which may easily cause structural collapse. Therefore, in this embodiment, the tension force point of the lower cable 2 is transferred to the more stable side column 4 to minimize the load impact on the roof body 1.

[0027] On the other hand, Figure 6 As shown, a plurality of lifting ears 17 are provided on the circumferential strut 302, and both ends of the horizontal circumferential cable 5 and the oblique circumferential cable 6 are connected to the lifting ears 17. In this embodiment, the horizontal circumferential cable 5 is pulled close to the lower end of the circumferential strut 302, and all the horizontal circumferential cables 5 pulled between the circumferential struts 302 in the same ring are in the same horizontal plane, and both ends of a single horizontal circumferential cable 5 are respectively connected to two adjacent circumferential struts 302; one end of a single oblique 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 cross-type oblique circumferential cables 6 are pulled between the two adjacent annular struts 302.

[0028] When the cable-support reinforcement system resists the load, both sides of the single annular support rod 302 can be subjected to the tension of the horizontal annular cable 5 and the diagonal annular cable 6. The completely closed load-bearing ring can offset the external lateral load and prevent it from lateral displacement, which can significantly improve the support stability of the structural system.

[0029] In this embodiment, tensioners (not shown in the figure) are installed at both ends of the lower cable 2, the horizontal annular cable 5 and the oblique annular cable 6. After the lower cable 2, the horizontal annular cable 5 and the oblique annular cable 6 are pulled, they are tensioned by the tensioners installed thereon. The tensioners are existing products on the market, such as mechanical threaded tensioners, hydraulic steel cable tensioners, etc., and their function is to simultaneously contract from both ends of the cable to put the cable in a tensioned and stressed state.

[0030] It should be noted that, in this embodiment, the number of the lower cables 2 and the support rods 3, the degree of concavity of the lower cables 2 and the spacing distance of the support rods 3 need to be reasonably configured according to the span of the target roof structure, the structural characteristics of the roof beams and the load-bearing requirements. The specific determination method involves structural analysis and force testing of the target roof structure. How to calculate the various setting parameters in this technical solution based on the existing roof building structure does not belong to the technical focus that the present invention wants to protect, so it will not be repeated here.

[0031] For flat roof structures, traditional cable-bracing systems are usually based on separate cable supports for each beam. The problem is that the individual cables and struts under a single beam are easily affected by lateral loads, causing out-of-plane instability. For flat roofs, lateral displacement of the load-bearing plane will cause the direction of the cable-bracing resultant force to be in the same state as the direction of the out-of-plane displacement. In other words, the cable-bracing resultant force will continue to increase the degree of deviation of the load-bearing plane, thereby greatly affecting the cable-bracing system.

[0032] Based on the above considerations, the spider-web type cable support reinforcement system provided in this embodiment is based on the overall reinforcement idea of ​​the plane roof structure, and a central cross-type lower cable 2 is set, and a central support rod 301 is used at the central intersection to link all the lower cables, so that each lower cable 2 can be jointly stressed, which can significantly improve the load resistance of the overall cable support system and avoid lateral instability of a single lower cable 2; at the same time, this embodiment also simultaneously pulls a horizontal circumferential cable 5 and an oblique circumferential cable 6 between the circumferential support rods 302, which cooperate with the lower cable 2 to form A spider-web-type cable-support reinforcement system, in which the horizontal circumferential cables 5 form a closed stress ring on the horizontal plane between the circumferential struts 302 in the same ring, and the diagonal circumferential cables 6 form a closed stress ring on the vertical plane between the circumferential struts 302 in the same ring. Under the above-mentioned two-way closed stress, the circumferential struts 302 in the same ring restrain each other, and the external load can be offset by the horizontal circumferential cables 5 and the diagonal circumferential cables 6, avoiding lateral displacement of the lower cable when bearing lateral loads, so that the cable-support reinforcement system has better support stability.

[0033] Example 2 like Figures 4 to 9 As shown, on the one hand, in order to adapt to the flat steel frame roof structure, the spider web cable-bracing reinforcement system provided in this embodiment adopts the following strut-roof body connection node: the upper end of the strut 3 is connected to the roof body 1 through a roof connection part, and the roof connection part is detachably connected to the strut 3; the roof connection part includes a plurality of centrally symmetrical and horizontally arranged opening and closing clamps 7, and the opening and closing clamps 7 are sleeved on the roof beam rods in the roof body 1. The number of the opening and closing clamps 7 depends on the number of roof beam rods at the connection point between the roof body 1 and the strut 3.

[0034] Specifically, see Figure 4 and Figure 6 In this embodiment, the roof connection part is connected to the support rod 3 through flange bolts, and several of the open and close clamps 4 are welded to the flange in the roof connection part through connecting ribs; the open and close clamp 7 is composed of two semicircular clamping grooves, and the two side edges of the two semicircular clamping grooves are connected by several bolts. When installing the open and close clamp 7, it is necessary to first split it into two halves, and then put them on the roof beam rod one by one, and finally connect and fix the two halves of the clamp.

[0035] Furthermore, participate Figure 7 In the retractable clamp 7, a clamp block 8 is provided which matches the shape and size of the roof beam member in the roof body. In this embodiment, Figure 11 As shown, the clamping block 8 is a two-half type, and a clamping groove adapted to the roof beam member is provided in the middle of the clamping block 8. When installing, the clamping block 8 is first disassembled and clamped on the roof beam member accordingly, and then the open and close clamp 7 is put on the clamping block 8.

[0036] The function of the clamping block 8 is to improve the applicability and standardized production of the roof connection part. For roof beam rod structures of different specifications, it is only necessary to select the clamping block 8 that is compatible with it, without customizing the roof connection part with the opening and closing clamp 7 of the same specifications. This is more conducive to the unified manufacturing of parts and saves production costs.

[0037] Of course, in more embodiments, in order to adapt to different types of plane roof structures, the structure of the support rod-roof body connection node can be adjusted accordingly to ensure the connection stability between the support rod 3 and the roof body 1. For example, when the target plane roof structure is a concrete structure roof, the support rod 2 can be directly fixed to the concrete beam through anchor bolts.

[0038] On the other hand, Figures 4 to 9 As shown, the support rod-down cable connection node adopted in this embodiment is: a plurality of through grooves are provided on the support rod 3 corresponding to the pulling direction of the plurality of the down cables 2, and the plurality of through grooves are provided up and down; a fixed pulley 9 is installed in the through groove along the pulling direction of the down cables 2, and the down cables 2 pass through the through groove and slide in cooperation with the fixed pulley 9.

[0039] The above-mentioned connection node method between the support rod 3 and the lower cable 2 is mainly through the fixed pulley 9 in the support rod 3 and the lower cable 2 to form a sliding fit. The fixed pulley 9 can reduce the friction between the lower cable 2 and the support rod 3 when tensioning or bearing loads, saving effort while also reducing the wear of the lower cable 2 and increasing the service life of the lower cable 2; at the same time, the sliding connection of the support rod-lower cable connection node is coordinated with the fixed connection of the support rod-roof body connection node. Compared with the traditional upper and lower connection nodes that are both hinged, the combination of dynamic and static methods is more conducive to maintaining the verticality of the support rod 3. When the support rod 3 is subjected to a large load, the lower cable 2 can automatically adjust the position of the load-bearing point by relative sliding with the fixed pulley 9, so that the support rod 3 will not tilt under the action of the load, so as to ensure stable vertical force transmission.

[0040] The key points of this embodiment are: the struts 3 are fixedly connected to the roof body 2, and the struts 3 are slidably connected to the lower cables 2. In conventional beam-string structures, the struts are hinged at both ends, so the load-bearing points between the struts and the lower cables are relatively fixed. Adjusting the verticality of the struts 3 requires controlling the tension at both ends of the lower cables to cause the struts 3 to rotate relative to each other within the vertical plane. However, this adjustment method is overly complex and difficult to achieve precise accuracy in practice. In contrast, the arrangement in this embodiment allows the lower cables 2 to slide relative to the fixed pulley 9, allowing the load-bearing points between the struts and the lower cables to freely shift. This prevents the struts 3 from being affected by the tension of the lower cables 2, allowing the struts 3 to automatically maintain their vertical position.

[0041] Example 3 like Figure 7 、 Figure 9 、 Figure 10 As shown, a lower cable limiting structure is installed on the lower cable 2 at both ends corresponding to the through slot through which the lower cable passes. The lower cable limiting structure is detachably connected to the lower cable 2. The lower cable limiting structure is used to limit and fix the lower cable 2 after the lower cable 2 is pulled and tensioned and pre-tensioned, so as to prevent the lower cable 2 from displacement and loosening under long-term stress and improve its stress stability.

[0042] Specifically, the lower pull rope limiting structure includes two opening and closing rope loops 10 adapted to the lower pull rope 2, and the two opening and closing rope loops 10 are respectively arranged on the lower pull rope 2 at both ends of the through slot. In this embodiment, the opening and closing rope loop 10 is composed of two semicircular clamping loops, and the two semicircular clamping loops are connected by bolts; two connecting plates 11 are symmetrically arranged on the opening and closing rope loop 10, and the connecting plates 11 are perpendicular to the axis of the opening and closing rope loop 10; the connecting plates 11 on the two opening and closing rope loops 10 at both ends of the through slot are connected by long bolts 12; a plurality of 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 slot correspond to each other one by one.

[0043] During installation, first split the opening and closing rope loop 10 in the lower pull rope limiting structure into two halves, and put them correspondingly on the lower pull rope 2 located at both ends of the through groove, and then connect and fix the two halves of the opening and closing rope loop 10; then select appropriate bolt connection holes 13 on the connecting plate 11 according to the size specifications of the central support rod 301 and the annular support rod 302, and connect the connecting plates 11 on the two opening and closing rope loops 10 located at both ends of the through groove through long bolts 12.

[0044] The lower cable limiting structure in this embodiment can uniformly limit and fix the lower cables 2 located at both ends of the through slot to ensure that the lower cables 2 at both ends of the through slot have consistent limiting effects and ensure that the force between the lower cables 2 and the fixed pulley 9 is stable.

[0045] Example 4 like Figures 4 to 9 As shown, this embodiment is a further supplementary solution to the above-mentioned embodiment 2. A reinforcing sleeve 14 is provided on the slotted area corresponding to the through slot on the strut 3. A through hole corresponding to the through slot is provided on the reinforcing sleeve 14. The reinforcing sleeve 14 is intended to improve the structural strength of the strut 3 itself. Because if there are many pull-down ropes 2 to be pulled, it is necessary to open multiple through slots on the strut 3, and its own strength will inevitably be affected. Therefore, the reinforcing sleeve 14 is added to correspondingly improve the structural strength of the strut 3 in this area, extend its service life, and reduce the subsequent maintenance cost.

[0046] Example 5 like Figure 4 、 Figure 5 、 Figure 7 As shown, this embodiment is a further supplementary solution to the above-mentioned embodiment 2. The center strut 301 is multi-section, and at least one lower pull rope 2 passes through each section of the center strut 301. The two adjacent sections of the center strut 301 are detachably connected. Specifically, the two adjacent sections of the center strut 301 are connected by a flange 15, and corresponding arc-shaped bolt connection grooves 16 are provided on the two correspondingly connected flanges 15.

[0047] The purpose of setting up a multi-section center support rod 301 is to enable each section of the center support rod 301 to adjust the relative direction of the through groove on the center support rod 301 by relative rotation within a small range, thereby compensating for the deviation in the pulling direction of the lower cable 2. Because when designing the cable support reinforcement system for the target plane roof structure, it cannot be completely guaranteed that the pulling direction of all the lower cables 2 can correspond one-to-one with the direction of the through groove on the center support rod 301. Therefore, in order to avoid specially customizing a unique center support rod 301, the center support rod 301 is set to a multi-section adjustable type, and the direction of the through groove on each section is adjusted by fine-tuning the connection angle between two adjacent sections of the center support rod 301 to adapt to the unique plane roof structure.

[0048] It should be noted that the main difference between the central strut 301 and the annular struts 302 in the present application lies in the number of lower cables 2 passing through them, specifically, all the lower cables 2 will pass through the central strut 301, while only one lower cable 2 needs to pass through the annular struts 302; therefore, from a conventional perspective, multiple through grooves need to be opened on the central strut 301, and only a single through groove needs to be opened on the annular struts 302. However, in order to improve the versatility of the struts 3, the present application sets the central strut 301 and the annular struts 302 to have the same structure, but the annular struts 302 only need to retain a section of the central strut 301 connected to the roof connection part, and the rest of the lower section will be removed during installation. Figure 6 and Figure 7 shown.

[0049] Example 6 This embodiment provides a construction method based on the spider web type cable bracing reinforcement system, comprising the following steps: S1: Install anchor supports on the corresponding side columns; connect the center brace and the ring brace to the corresponding roof beams of the roof truss. S2: Hoist and pull the lower cables one by one, first connect one end of the lower cable to a certain anchor support, then pass the other end through the corresponding circumferential strut and the central strut in sequence and connect to another corresponding anchor support; after all the lower cables are pulled, tension the lower cables through the tensioner on the lower cables, but do not apply pre-tension; S3: After all the lower cables are tensioned, the horizontal ring cables and the oblique ring cables are hoisted and pulled in sequence, and the ends of each horizontal ring cable and the oblique ring cable are connected to the lifting ears on the corresponding ring support rods; after all the horizontal ring cables and the oblique ring cables are pulled, each horizontal ring cable and the oblique ring cable is tensioned by the tensioner on each horizontal ring cable and the oblique ring cable; S4: After all horizontal hoop cables and diagonal hoop cables are tensioned, the tensioner on the lower cable is used to further tension the lower cable to apply appropriate pre-tension to the lower cable. S5: After the tensioning of each lower cable is completed, a lower cable limiting structure is installed on each lower cable at both ends corresponding to the through slot through which the lower cable passes.

[0050] In this embodiment, the step of connecting the central struts and the annular struts in step S1 includes: S11: Select the center brace and the ring brace with the same number of retractable clamps according to the number of roof beams required to be connected at a single connection point; S12: Selecting a clamping block with a size matching the outer diameter of the roof beam member to be connected, and clamping the clamping block onto the roof beam member; S13: Split all the retractable clamps at the upper ends of the central support rod and the annular support rod into two halves, and sleeve them on each clamping block in a one-to-one correspondence, and finally connect and fix the two halves of the clamps.

[0051] In this embodiment, in step S2, when each of the lower pull cables passes through the central strut, if there is a deviation between the pulling direction of the lower pull cables and the direction of the through slots through which they need to pass, the relative direction of the through slots on the single-section central strut is adjusted by twisting the multi-section central strut.

[0052] In this embodiment, the installation step of the lower cable limiting structure in step S5 includes: S51: Split the retractable cable sleeve in the lower cable limiting structure into two halves, and respectively sleeve the two halves onto the lower cables at both ends of the through slot, and then connect and secure the two halves of the retractable cable sleeve. S52: Select appropriate bolt connection holes on the connection plate according to the size specifications of the central strut or the annular strut, and connect the connection plates on the two retractable cable sleeves at both ends of the through slot with long bolts.

[0053] 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 aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spider web type cable bracing reinforcement system for a large-span flat roof structure, comprising a roof body (1), a plurality of lower cables (2) and a plurality of struts (3), wherein the lower cables (2) are pulled below the roof body (1) in a concave shape, and the struts (3) are installed between the roof body (1) and the lower cables (2), and characterized in that: The roof body (1) is supported by side columns (4), and a plurality of lower cables (2) are arranged in a central cross-type arrangement, and both ends of the lower cables (2) are connected to the side columns (4); the support rods (3) include a central support rod (301) and a plurality of circumferential support rods (302), wherein the central support rod (301) is vertically installed at the central cross-type position of the plurality of lower cables (2), and the plurality of circumferential support rods (302) are vertically installed on the lower cables (2) in a circular radial pattern around the central support rod (301); horizontal circumferential cables (5) are sequentially pulled between the circumferential support rods (302) of the same ring and at least one ring, or oblique circumferential cables (6) are sequentially pulled between the circumferential support rods (302) of the same ring and at least one ring, or horizontal circumferential cables (5) and oblique circumferential cables (6) are sequentially pulled between the circumferential support rods (302) of the same ring and at least one ring.

2. The spider web cable support reinforcement system according to claim 1, characterized in that: The upper end of the support rod (3) is connected to the roof body (1) via a roof connection part, and the roof connection part is detachably connected to the support rod (3); the roof connection part comprises a plurality of centrally symmetrical and horizontally arranged opening and closing clamps (7), and the opening and closing clamps (7) are sleeved on the roof beam rod in the roof body (1); and a clamping block (8) adapted to the shape and size of the roof beam rod in the roof body (1) is clamped in the opening and closing clamps (7).

3. The spider web type cable support reinforcement system according to claim 1, characterized in that: A plurality of through slots are provided on the support rod (3) along the pulling direction of the plurality of lower cables (2), and the plurality of through slots are provided up and down; a fixed pulley (9) is installed in the through slot along the pulling direction of the lower cables (2), and the lower cables (2) pass through the through slot and are slidably engaged with the fixed pulley (9).

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

5. The spider web type cable support reinforcement system according to claim 4, characterized in that: The lower pull rope limiting structure comprises two opening and closing rope sleeves (10) adapted to the lower pull rope (2), the two opening and closing rope sleeves (10) being respectively sleeved on the lower pull rope (2) at both ends of the through slot; two connecting plates (11) are symmetrically arranged on the opening and closing rope sleeves (10), the connecting plates (11) being perpendicular to the axis of the opening and closing rope sleeves (10); the connecting plates (11) on the two opening and closing rope sleeves (10) at both ends of the through slot are connected by long bolts (12).

6. The spider web type cable bracing reinforcement system according to claim 3, characterized in that: The central support rod (301) is multi-sectioned, and at least one pull-down cable (2) passes through each section of the central support rod (301). Two adjacent sections of the central support rod (301) are detachably connected. The two adjacent sections of the central support rod (301) are connected via flanges (15), and corresponding arc-shaped bolt connection grooves (16) are provided on the two correspondingly connected flanges (15).

7. The spider web type cable bracing reinforcement system according to claim 1, characterized in that: All horizontal hoop cables (5) pulled between the hoop support rods (302) in the same ring are located in the same horizontal plane, and both ends of a single horizontal hoop cable (5) are respectively connected to two adjacent hoop support rods (302).

8. The spider web type cable bracing reinforcement system according to claim 1, characterized in that: One end of a single oblique annular cable (6) is connected to the upper end of one of the two adjacent annular support rods (302), and the other end is connected to the lower end of the other of the two adjacent annular support rods (302); two cross-type oblique annular cables (6) are pulled between the two adjacent annular support rods (302).

9. The construction method based on the above spider web type cable support reinforcement system is characterized in that: The following steps are involved: S1: Install anchor supports on the corresponding side columns; connect the center brace and the ring brace to the corresponding roof beams of the roof truss. S2: hoist and pull the lower cables in sequence, first connect one end of the lower cable to a certain anchor support, then pass the other end through the corresponding annular support rod and the central support rod in sequence and connect it to another corresponding anchor support; After all the lower cables have been pulled, the lower cables are tensioned by the tensioners on the lower cables, but no pre-tension is applied; S3: After all the lower cables are tensioned, the horizontal hoop cables and / or the oblique hoop cables are hoisted and pulled in sequence, and the ends of each horizontal hoop cable and / or the oblique hoop cable are connected to the lifting ears on the corresponding hoop support rods; After all horizontal hoop cables and / or oblique hoop cables have been pulled, tensioning the horizontal hoop cables and / or oblique hoop cables using tensioners on the horizontal hoop cables and / or oblique hoop cables; S4: After all horizontal hoop cables and / or diagonal hoop cables are tensioned in place, the lower cables are further tensioned by the tensioner on the lower cables to apply appropriate pre-tension to the lower cables; S5: After the tensioning of each lower cable is completed, a lower cable limiting structure is installed on each lower cable at both ends corresponding to the through slot through which the lower cable passes.

10. The construction method according to claim 9, characterized in that: In step S1, the step of connecting the central struts and the annular struts includes: S11: Select the center brace and the ring brace with the same number of retractable clamps according to the number of roof beams required to be connected at a single connection point; S12: Selecting a clamping block with a size matching the outer diameter of the roof beam member to be connected, and clamping the clamping block onto the roof beam member; S13: Split all the retractable clamps at the upper ends of the central support rod and the annular support rod into two halves, and sleeve them on each clamping block in a one-to-one correspondence, and finally connect and fix the two halves of the clamps.

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