Fabricated external prestress support for roof reinforcement and connecting joint

Abstract

The invention belongs to the field of building structure reinforcement, discloses an assembly type external prestress support for roof reinforcement and a connecting joint, and mainly aims to solve the problem that a supporting rod of an existing connecting joint structure is insufficient in supporting stability. By arranging the fixedly-connected upper connecting nodes and the slidably-connected lower connecting nodes, relative sliding can only be generated between the supporting rod body and the prestressed inhaul cable on the basis that the upper end of the supporting rod body is fixed, the perpendicularity of the supporting rod body can be better kept during long-term work through the dynamic and static combined connecting nodes, and the supporting rod body is not prone to inclining; meanwhile, due to the fact that the upper end of the supporting rod body is fixed, when the supporting rod body is subjected to lateral load, lateral instability of the supporting plane of the supporting rod body can be avoided through limiting of the upper end, and therefore the supporting stability of the supporting rod body can be effectively improved, and a good foundation is provided for supporting and reinforcing.

Description

Technical Field

[0001] The present invention belongs to the field of building structure reinforcement, and in particular relates to an assembled external prestressed support and connection node for roof reinforcement. Background Art

[0002] Due to their structural characteristics of large spans, 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 the bearing capacity is insufficient due to defects in the early architectural design or acquired damage to the roof structure, it takes a very high cost to reinforce the existing floor or roof structure. This is mainly reflected in: For large-span spatial steel structures and grid structures, when the bearing capacity of structural rods is insufficient, welding is usually used to increase the connection load section 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 unloading conditions during normal commissioning, so the implementation of this solution is more difficult.

[0003] In addition, there is another reinforcement method for the above-mentioned roof structure, namely the overall structural prestressed reinforcement method. This method involves the tensioning of prestressed cables and the application of traditional tensioned beam structures to achieve structural reinforcement. The upper and lower connection nodes of the struts are generally connected to the roof beams and prestressed cables by hinges, so that the struts can only rotate relative to the roof beams or prestressed cables. Therefore, when the prestressed cables are tensioned or subjected to external loads, if the force at the lower end support point of the strut is asymmetric, the struts will rotate relative to each other, making it impossible for them to always maintain a vertical force state, thereby affecting their subsequent load-bearing performance and resulting in poor structural stability. If you want to adjust the verticality of the struts, you need to reasonably distribute the tensioning force at both ends of the prestressed cables so that the struts can rotate in the vertical plane to restore their vertical state. However, in actual operation, this method is difficult to achieve accuracy.

[0004] In view of the above problems, it is necessary to optimize the existing prefabricated external prestressed supports and connection nodes used for roof reinforcement. Summary of the Invention

[0005] The purpose of the present invention is to provide an assembled external prestressed support and connection node for roof reinforcement, aiming to solve the problem of insufficient stability of the brace support of the existing connection node structure.

[0006] To achieve the above object, the present invention provides the following technical solutions: The assembled external prestressed support and connection node for roof reinforcement includes a strut body, an upper connection node and a lower connection node. The strut body is connected to the roof beam body through the upper connection node, and the strut body is connected to the prestressed cable through the lower connection node; the upper connection node is a fixed connection node, and the lower connection node is a sliding connection node.

[0007] As a further preferred embodiment of the above technical solution, the upper connection node includes a plurality of horizontally arranged and centrally symmetrically arranged connection clamps, and the connection clamps are sleeved on the roof beam body; the lower end of the connection clamp is detachably connected to the support rod body through a connecting flange.

[0008] As a further preferred embodiment of the above technical solution, the connecting clamp is an upper and lower opening and closing clamp, and the upper clamp and the lower clamp are detachably connected.

[0009] As a further preferred embodiment of the above technical solution, a clamping block that is adapted to the shape and size of the roof beam is clamped inside the connecting clamp.

[0010] As a further preferred embodiment of the above technical solution, the lower connecting node includes a plurality of through grooves opened on the support rod body, and the plurality of through grooves are arranged up and down, and the penetration direction of the through grooves is consistent with the pulling direction of the prestressed cable; a fixed pulley is installed in the through groove along the pulling direction of the prestressed cable, and the prestressed cable passes through the through groove and slides with the fixed pulley.

[0011] As a further preferred embodiment of the above technical solution, a reinforcing sleeve is sleeved on the slotted area of ​​the strut body corresponding to the through slot, and a through hole corresponding to the through slot is opened on the reinforcing sleeve.

[0012] As a further preference of the above technical solution, the strut body is multi-section, each section of the strut body is penetrated by at least one prestressed cable, the two adjacent sections of the strut body are connected by torsion flange bolts, and corresponding arc-shaped bolt connection grooves are provided on the torsion flange.

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

[0014] As a further preference of the above technical solution, the cable limiting structure includes two opening and closing cable loops adapted to the prestressed cable, and the two opening and closing cable loops are respectively arranged on the prestressed cable at both ends of the through slot; two connecting plates are symmetrically arranged on the opening and closing cable loops, and the connecting plates are perpendicular to the axis of the opening and closing cable loops; the connecting plates on the two opening and closing cable loops located at both ends of the through slot are connected by long bolts.

[0015] As a further preferred embodiment of the above technical solution, a plurality of lifting ears are installed on the support rod body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention sets a fixed upper connection node and a sliding lower connection node, so that the strut body can only slide relative to the prestressed cable on the basis that the upper end is fixed. When the prestressed cable is tensioned or the strut body is subjected to load, the influence of the tensioning force or load force can be offset by the relative sliding between the strut body and the prestressed cable. The dynamic and static combined connection node is more conducive to maintaining the verticality of the strut body during long-term work, making it less likely to tilt. At the same time, since the upper end of the strut body is fixed, when the strut body is subjected to lateral loads, the limit at the upper end can also avoid lateral instability of the support plane of the strut body, so that the present invention can effectively improve the support stability of the strut body and provide a good foundation for support reinforcement.

[0017] The upper connection node of the present invention adopts an adaptive clamp connection structure, which can cross the connection nodes of the roof itself, such as bolt balls, welding balls or intersecting nodes. The detachable opening and closing clamp structure can effectively reinforce the existing roof structure without damaging the original connection structure and unloading the original roof structure; the lower connection node of the present invention converts the sliding friction of the traditional tensioned beam node into rolling friction through a fixed pulley, and the friction coefficient is significantly reduced, so that the tension transmitted to the strut body by tensioning is significantly reduced, thereby improving the supporting stability of the strut body, and after the tensioning is completed, the prestressed cable and the strut body can be fixed and limited by the cable limiting structure, thereby achieving the technical effect of "relaxing during tensioning and fixing during use". At the same time, the multiple through grooves stacked up and down can adapt to the pulling requirements of multiple prestressed cables, effectively improving the versatility of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 installation structure of a certain embodiment of the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of the local structure of the lower connection node of the middle support rod body; Figure 3 for Figure 1 An enlarged schematic diagram of the structure of the middle cable limiting structure; Figure 4 for Figure 1An enlarged schematic diagram of the local structure of the upper connection node of the middle support rod body; Figure 5 This is a schematic diagram of the overall installation structure of another embodiment of the present invention; Figure 6 This is a schematic diagram of the specific structure of the cable limiting structure in a certain embodiment of the present invention; Figure 7 Schematic diagram of the specific structure of the card block in a certain embodiment of the present invention.

[0019] Among them, 1-strut body, 2-roof beam, 3-prestressed cable, 4-connecting clamp, 5-connecting flange, 6-block, 7-through groove, 8-fixed pulley, 9-reinforcement sleeve, 10-torsion flange, 11-arc-shaped bolt connection groove, 12-opening rope sleeve, 13-connecting plate, 14-long bolt, 15-lifting ear. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1 like Figures 1 to 7 As shown, this embodiment provides an assembled external prestressed support and connection node for roof reinforcement, including a strut body 1, an upper connection node and a lower connection node. The strut body 1 is connected to the roof beam body 2 through the upper connection node, and the strut body 1 is connected to the prestressed cable 3 through the lower connection node; the upper connection node is a fixed connection node, and the lower connection node is a sliding connection node.

[0022] Specifically, see Figure 1 、 Figure 4 and Figure 5 The upper connection node includes several horizontally arranged and centrally symmetrically arranged connection clamps 4, and the connection clamps 4 are sleeved on the roof beam 2. Multiple connection clamps 4 can not only meet the different roof beam 2 structures, but also can realize the fixation of the upper connection node from multiple directions to ensure the connection stability of the upper connection node; the lower end of the connection clamp 4 is detachably connected to the support rod body 1 through a connecting flange 5.

[0023] The connecting clamp 4 in this embodiment is an upper and lower opening and closing clamp, the upper clamp and the lower clamp are in the shape of a semicircular slot, and the two sides of the upper and lower clamps are detachably connected by a plurality of bolts; Figure 1As shown, the lower end of the lower clamp is fixedly connected to a flange through a connecting rib, and another matching flange is fixedly connected to the upper end of the support rod body 1. The two flanges are detachably connected by bolts, and the upper clamp can be separated from the lower clamp to facilitate the installation between the upper connection node and the roof beam 2.

[0024] It should be noted that the number of the connecting clamps 4 is determined according to the number of beam structures at the connection position between the support rod body 1 and the roof beam 2.

[0025] Furthermore, if Figure 1 and Figure 5 As shown, a block that matches the shape and size of the roof beam 2 is provided in the connecting clamp 4. Specifically, see Figure 7 The clamping block includes a plurality of equally spaced clamping rings, with adjacent clamping rings fixedly connected by connecting ribs. The inner diameter of the clamping ring matches the outer diameter of the roof beam 2, and the outer diameter of the clamping ring matches the clamping diameter of the connecting clamp 4. The clamping ring is clamped within the connecting clamp 4, and the roof beam 2 is clamped within the clamping ring. The arrangement of the clamping block facilitates the standardized production of the connecting clamp 4. For roof beam 2 structures of different specifications, only the corresponding clamping block needs to be equipped, without the need to customize the connecting clamp 4 of the corresponding specifications. This makes it easier to uniformly manufacture a single component and saves production costs.

[0026] On the other hand, see Figure 1 and Figure 2 The lower connection node includes a plurality of through slots 7 opened on the support rod body 1, and the plurality of through slots 7 are arranged up and down, and the penetration direction of the through slots 7 is consistent with the pulling direction of the prestressed cable 3; a fixed pulley 8 is installed in the through slot 7 along the pulling direction of the prestressed cable 3, and the prestressed cable 3 passes through the through slot 7 and slides with the fixed pulley 8.

[0027] The above-mentioned lower connecting node is mainly formed by sliding cooperation between the fixed pulley 8 in the strut body 1 and the prestressed cable 3. The fixed pulley 8 can not only reduce the friction between the prestressed cable 3 and the strut body 1 at the connecting node when the prestressed cable 3 is tensioned or under load, but also save effort and reduce the wear of the prestressed cable 3, thereby increasing the service life of the cable; at the same time, the sliding cooperation of the lower connecting node is combined with the fixed connection of the upper connecting node, and the dynamic and static combined connection node is more conducive to maintaining the verticality of the strut body 1 during long-term work, making it less likely to tilt; at the same time, since the upper end of the strut body 1 is fixed, when the strut body 1 is subjected to lateral loads, the limit at the upper end can also prevent the supporting plane of the strut body 1 from lateral instability.

[0028] The key points of this embodiment are as follows: the support rod body 1 and the roof beam body 2 are connected in a fixed manner, and the support rod body 1 and the prestressed cable 3 are connected in a sliding manner. In the traditional prestressed reinforcement structure, the upper and lower ends of the support rod body 1 are both hinged, and the hinge position of the support rod body 1 on the roof beam body 2 and the prestressed cable 3 is fixed. Therefore, when the prestressed cable 3 is tensioned or subjected to external force, if the force at the support point position of the lower end of the support rod body 1 is asymmetrical, the support rod body 1 will rotate relative to the hinge structure, resulting in it being unable to always maintain a vertical force state, thereby affecting the subsequent load-bearing performance and poor structural stability; and if you want to readjust the verticality of the support rod body 1, you need to reasonably distribute the tensioning force at both ends of the prestressed cable 3 so that the support rod body 1 rotates in the opposite direction in the vertical plane to restore it to its initial vertical state, but in actual operation, this method is difficult to achieve accuracy. The arrangement in this embodiment can prevent the brace body 1 from being affected by the tension and load of the prestressed cable 3 because the prestressed cable 3 and the fixed pulley 8 in the brace body 1 can slide relative to each other, so that the brace body 1 can automatically maintain a vertical state.

[0029] Example 2 This embodiment is a further supplement to the above embodiment 1. Figure 1 and Figure 3 In this embodiment, cable retaining structures are installed on the prestressed cables 3 at both ends corresponding to the through-slots 7 through which they pass. The cable retaining structures are detachably connected to the prestressed cables 3. The cable retaining structures are used to position and secure the prestressed cables 3 after they are tensioned and prestressed, thereby preventing them from shifting and loosening under long-term stress and improving their stress stability.

[0030] Specifically, if Figure 3 and Figure 6 As shown, the cable limiting structure includes two opening and closing cable sleeves 12 adapted to the prestressed cable 3, and the two opening and closing cable sleeves 12 are respectively arranged on the prestressed cable 3 at both ends of the through slot 7. In this embodiment, the opening and closing cable sleeve 12 is composed of two semicircular clamping sleeves, and the two semicircular clamping sleeves are connected by bolts; two connecting plates 13 are symmetrically arranged on the opening and closing cable sleeve 12, and the connecting plates 13 are perpendicular to the axis of the opening and closing cable sleeve 12; the connecting plates 13 on the two opening and closing cable sleeves 12 at both ends of the through slot 7 are connected by long bolts 14; it can be foreseen that a plurality of bolt connection holes are provided on the connecting plate 13, and the bolt connection holes on the connecting plates 13 at both ends of the through slot 7 correspond one to one.

[0031] During installation, first split the opening and closing cable sleeve 12 in the cable limiting structure into two halves, and put them correspondingly on the prestressed cable 3 located at both ends of the through slot 7, and then connect and fix the two halves of the opening and closing cable sleeve 12; then select suitable bolt connection holes on the connecting plate 13 according to the size specifications of the support rod body 1, and connect the connecting plates 13 on the two opening and closing cable sleeves 12 located at both ends of the through slot 7 through long bolts 14.

[0032] The cable limiting structure in this embodiment can uniformly limit and fix the prestressed cables 3 located at both ends of the through slot 7 to ensure that the prestressed cables 3 at both ends of the through slot 7 have a consistent limiting effect, ensuring that the force between the prestressed cables 3 and the fixed pulley 8 is stable.

[0033] Example 3 This embodiment is a further supplement to the above embodiment 1. Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 In this embodiment, a reinforcing sleeve 8 is provided on the slotted area corresponding to the through slot 7 on the strut body 1, and a through hole corresponding to the through slot 7 is provided on the reinforcing sleeve 8. The reinforcing sleeve 8 is intended to improve the structural strength of the strut body 1. Because if more prestressed cables 3 need to be pulled, more through slots 7 need to be opened on the strut body 1, and the structural strength of the strut body 1 will inevitably be affected. Therefore, by adding a reinforcing sleeve 8, the structural strength of the strut body 1 in this area is correspondingly improved, which can extend its service life and reduce the subsequent maintenance cost.

[0034] Example 4 This embodiment is a further supplement to the above embodiment 1. Figure 1 and Figure 3 In this embodiment, the strut body 1 is multi-section, and each section of the strut body 1 has at least one prestressed cable 3 running through it. The two adjacent sections of the strut body 1 are bolted together by a torsion flange 10, and a corresponding arc-shaped bolt connection groove 11 is provided on the torsion flange 10.

[0035] The method of using the above-mentioned multi-section strut body 1 is as follows: when multiple prestressed cables 3 need to be pulled through a single strut body 1, a prestressed cable 3 is passed through each section of the strut body 1 through a segmented setting. When all the prestressed cables 3 are tensioned, the relative angles of the two corresponding upper and lower torsion flanges 10 can be rotated within the arc connection range of the arc-shaped bolt connection groove 11, so that the pulling direction of the prestressed cable 3 is consistent with the sliding groove direction of the fixed pulley 8 in the strut body 1, so as to ensure that the prestressed cable 3 can stably bear the load.

[0036] The purpose of setting up a multi-section strut body 1 is to enable each section of the strut body 1 to adjust the relative directions of the through groove 7 and the fixed pulley 8 on the strut body 1 through relative rotation within a small range, thereby compensating for the relative direction error between the prestressed cables 3 when pulling multiple prestressed cables 3. Because most roof structures are not completely symmetrical, the directions of the pulled prestressed cables 3 cannot completely maintain a uniform spacing. Therefore, the direction of the through groove 7 on the strut body 1 needs to be customized according to actual conditions. In order to facilitate the unified and standardized production of the strut body 1, this embodiment sets the strut body 1 to be multi-section, and adjusts the relative directions between each through groove 7 and the fixed pulley 8 by fine-tuning the connection angle between the two adjacent sections of the strut body 1 to adapt to the prestressed cable pulling requirements required for different roof structures.

[0037] Example 5 This embodiment is a further supplement to the above embodiment 1. Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 In this embodiment, a plurality of lifting lugs 15 are installed on the strut body 1. The lifting lugs 15 are used to pull stabilizing cables, such as horizontal cables and oblique cables, between the two strut bodies 1 to improve the stability of the strut body 1 itself and prevent it from becoming lateral unstable.

[0038] 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. Assembled external prestressed support and connection nodes for roof reinforcement, characterized in that: The invention comprises a support rod body (1), an upper connection node and a lower connection node, wherein the support rod body (1) is connected to a roof beam body (2) via the upper connection node, and the support rod body (1) is connected to a prestressed cable (3) via the lower connection node; the upper connection node is a fixed connection node, and the lower connection node is a sliding connection node.

2. The assembled external prestressed support and connection node according to claim 1 is characterized in that: The upper connection node comprises a plurality of connection clamps (4) arranged horizontally and in a centrally symmetrical arrangement, wherein the connection clamps (4) are sleeved on the roof beam body (3); the lower ends of the connection clamps (4) are detachably connected to the support rod body (1) via a connection flange (5).

3. The assembled external prestressed support and connection node according to claim 2 is characterized in that: The connecting clamp (4) is an upper and lower opening and closing clamp, and the upper clamp and the lower clamp are detachably connected.

4. The assembled external prestressed support and connection node according to claim 3 is characterized in that: A clamping block (6) that matches the shape and size of the roof beam (2) is clamped inside the connecting clamp (4).

5. The assembled external prestressed support and connection node according to claim 1, characterized in that: The lower connection node includes a plurality of through slots (7) provided on the support rod body (1), wherein the plurality of through slots (7) are arranged up and down, and the penetration direction of the through slots (7) is consistent with the pulling direction of the prestressed cable (3); a fixed pulley (8) is installed in the through slot (7) along the pulling direction of the prestressed cable (3), and the prestressed cable (3) passes through the through slot (7) and is slidably engaged with the fixed pulley (8).

6. The assembled external prestressed support and connection node according to claim 5 is characterized in that: A reinforcing sleeve (9) is sleeved on a slotted area on the support rod body (1) corresponding to the through slot (7), and a through hole corresponding to the through slot (7) is opened on the reinforcing sleeve (9).

7. The assembled external prestressed support and connection node according to claim 5, characterized in that: The strut body (1) is multi-sectioned, and at least one prestressed cable (3) runs through each section of the strut body (1). Two adjacent sections of the strut body (1) are bolted together via a torsion flange (10), and a corresponding arc-shaped bolt connection groove (11) is provided on the torsion flange (10).

8. The assembled external prestressed support and connection node according to claim 5, characterized in that: Cable limiting structures are installed on both ends of the prestressed cable (3) corresponding to the through slots (7) through which the prestressed cable passes, and the cable limiting structures are detachably connected to the prestressed cable (2).

9. The spider web type cable bracing reinforcement system according to claim 5, characterized in that: The cable limiting structure comprises two opening and closing cable sleeves (12) adapted to the prestressed cable (3), the two opening and closing cable sleeves (12) being respectively sleeved on the prestressed cable (3) at both ends of the through slot (7); two connecting plates (13) being symmetrically arranged on the opening and closing cable sleeves (12), the connecting plates (13) being perpendicular to the axis of the opening and closing cable sleeves (12); the connecting plates (13) on the two opening and closing cable sleeves (12) at both ends of the through slot (7) being connected by long bolts (14).

10. The assembled external prestressed support and connection node according to any one of claims 1 to 9, characterized in that: A plurality of lifting ears (15) are installed on the support rod body (1).

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