Prestressed fish-bellied uHPC roof truss structure and construction method thereof

Abstract

The application discloses a prestressed fish belly type UHPC roof truss structure and a construction method thereof, and relates to the field of roof truss structures.The prestressed fish belly type UHPC roof truss structure comprises four columns for bearing the gravity load of the roof truss and the upper structure thereof and a reinforcing assembly for improving the firmness of the fish belly type UHPC roof truss.A protective assembly is arranged on the top of the reinforcing assembly, and the protective assembly comprises an arc-shaped sleeve and two protective grooves for draining rainwater.When heavy snow weather occurs, the rain and snow first fall into the spherical grooves under the action of gravity, the lifting blocks are pressed to move downwards, the accumulated snow is moved into the sliding grooves, and a certain height difference is generated between each adjacent rectangular block and the fixed block, so that the top of the roof truss forms a concave-convex switching plate, and the problem that the fish belly type UHPC roof truss has no anti-skid measures to deal with heavy snow weather and is prone to safety hazards is solved.

Description

Technical Field

[0001] This invention relates to the field of roof truss structure technology, specifically to a prestressed fish-belly type UHPC roof truss structure and its construction method. Background Technology

[0002] With the increasing number of large-span building structures, traditional concrete roof truss structures have disadvantages such as low tensile strength and heavy self-weight for ultra-large span structures. UHPC roof truss refers to a roof truss structure constructed using ultra-high performance concrete. A roof truss is a spatial structure composed of a series of components, mainly used to support the roof or other superstructures. Prestressed fish-belly type ultra-high performance concrete roof truss structure is an efficient and economical building structure form, often used in large-span buildings.

[0003] In existing technologies, in order to effectively distribute the load applied to the roof truss and make its internal force distribution more uniform, the top of the prestressed fish-belly UHPC roof truss structure is mostly arc-shaped. This design can reduce stress concentration, thereby reducing the risk of structural cracks. However, when encountering heavy snow, the top of the prestressed fish-belly UHPC roof truss structure is high and the sides are low, and it often does not have the function of blocking and protecting objects from falling. When encountering blizzards, large chunks of snow stuck on the roof top are prone to slide down due to their own weight. Since the weight of a large area of ​​snow is relatively large, when it slides off the roof, it can easily affect people's lives and property safety.

[0004] Therefore, we propose a prestressed fish-belly type UHPC roof truss structure and its construction method to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a prestressed fish-belly type UHPC roof truss structure and its construction method, so as to solve the problem mentioned in the background art that the fish-belly type UHPC roof truss has no anti-slip measures and is prone to safety hazards in heavy snow weather.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a prestressed fish-belly type UHPC roof truss structure, comprising four columns for bearing the gravity load of the roof truss and its superstructure, and reinforcing components for improving the robustness of the fish-belly type UHPC roof truss. A protective component is provided on the top of the reinforcing component. The protective component includes an arc-shaped sleeve and two protective grooves for draining rainwater. The arc-shaped sleeve is made of galvanized steel plate, and its surface has arc-shaped grooves for facilitating water flow. Multiple slots are provided on the outer surface of the arc-shaped sleeve, and a rectangular groove is provided on the top of the arc-shaped sleeve. Multiple fixing blocks are evenly fixedly installed on the top, and all of the fixing blocks are made of concrete. A lifting plate is slidably embedded inside the arc-shaped groove. Multiple rectangular blocks, made of concrete, are fixedly connected to the outer surface of the lifting plate to prevent snow from sliding down the top of the fish-belly UHPC roof truss. A load-bearing block for detecting the thickness of snow accumulation is fixedly installed on the top of the lifting plate. Multiple first springs are set at the bottom of the load-bearing block. A sliding groove is opened on the top of the load-bearing block. Multiple second springs are set on the inner bottom surface of the sliding groove. The lifting block is slidably connected between the sliding groove and the inner wall.

[0007] Preferably, the top of the lifting block is provided with a plurality of spherical grooves for water storage, the tops of the plurality of lifting plates respectively extend movably through the outside of the plurality of slots, the top of the load-bearing block extends movably through the outside of the rectangular groove, the bottom ends of the plurality of first springs are fixedly connected to the inner bottom surface of the arc-shaped groove, the top ends of the plurality of first springs are fixedly connected to the bottom of the load-bearing block, the bottom ends of the plurality of second springs are fixedly connected to the inner bottom surface of the sliding groove, and the top ends of the plurality of second springs are fixedly connected to the bottom of the lifting block.

[0008] Preferably, the outer surface of the arc-shaped sleeve is provided with multiple water outlet holes near the two side edges, and the inner walls of the multiple water outlet holes are fixedly welded with a guide pipe for drawing water out. The multiple guide pipes are made of stainless steel. The bottom of the two protective grooves are fixedly connected with a water outlet pipe for conveying water outward. The top of the arc-shaped sleeve is fixed with an arc-shaped rod for diverting rain and snow near the two side edges by reinforcing ribs.

[0009] Preferably, the reinforcing assembly includes multiple beams for bearing loads from the roof. Each of the multiple beams has a vertical beam fixedly installed near the center of its top by reinforcing nails to directly bear the self-weight of the roof and other loads. Multiple diagonal braces for reinforcing the roof truss support force are fixed between the opposite outer surfaces of the multiple vertical beams. Multiple protective bars are fixedly connected near the two side edges of the top of each of the multiple beams by prestressed tendons.

[0010] Preferably, the opposite outer surfaces of the plurality of protective rods are fixed with lateral force resisting rods by prestressed tendons, and the tops of the plurality of vertical beams are fixedly connected with roof panels by prestressed steel bars.

[0011] Preferably, the top ends of the plurality of diagonal supports are fixedly connected to the inner wall of the roof panel by reinforcing ribs, and the top ends of the plurality of protective rods are fixedly connected to the inner wall of the roof panel by reinforcing ribs.

[0012] Preferably, two connecting rods for enhancing the stability of the roof truss are fixed between the bottoms of the plurality of beams by reinforcing ribs, and the two protective grooves are respectively fixedly connected to the outer surfaces of the two connecting rods by reinforcing ribs.

[0013] Preferably, the four columns are arranged in pairs, and each pair of columns is connected to a splicing rod by reinforcing nails. The four columns are divided into two groups, and the top of each group of columns is fixedly connected to the bottom of two connecting rods, and the top of each splicing rod is fixedly connected to the bottom of two connecting rods.

[0014] Preferably, the bottom of each of the multiple crossbeams is fixedly connected to a protective beam by prestressed tendons, and the top of each of the multiple protective beams is fixed with a scissor support frame for dispersing stress by reinforcing ribs near the two side edges.

[0015] A construction method for a prestressed fish-belly type UHPC roof truss includes the following steps: First, prepare sufficient prestressing tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fibers that are compatible with the prestressed fish-belly type UHPC roof truss structure, and conduct quality inspection.

[0016] The second step is to make templates according to the shape and size of the roof truss during the prefabrication stage, and then lay the prestressed tendons corresponding to each structure into the corresponding templates.

[0017] The third step is to pour the mixed UHPC concrete into the formwork. After each support structure of the roof truss is shaped, the prestress of each structure in the UHPC roof truss is tested by applying prestress.

[0018] Step 4: During the on-site installation phase, once the prestress of each structure meets the standard, on-site installation can begin. The four columns are then fixedly connected to the concrete foundation by welding and concrete pouring, and the splicing rods are welded between each pair of adjacent columns.

[0019] Step 5: Connect the two connecting rods to the tops of multiple columns on the same side using reinforcing ribs. Then, attach multiple crossbeams between the tops of the two connecting rods. Next, weld the vertical beams that serve as the main supporting structure between the inner wall of the roof panel and the top of the crossbeams using reinforcing ribs. Finally, connect multiple protective rods using reinforcing ribs.

[0020] Step 6: Connect and fix multiple lateral force resisting rods and diagonal supports. Then, fix the arc-shaped sleeve to the bottom of the roof panel through the reinforcing ribs. Finally, connect the two arc-shaped rods to the arc-shaped sleeve through the reinforcing ribs. The connection between the arc-shaped sleeve and the lifting plate is prefabricated.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. During use, when encountering heavy snow, the rain and snow first fall into the interior of the spherical groove under their own gravity, causing the lifting block to move downward under pressure. This causes the accumulated snow to move into the interior of the chute, resulting in a certain height difference between each adjacent rectangular block and the fixed block. This creates a concave-convex surface on the top of the roof truss, solving the problem that the fish-belly type UHPC roof truss in the existing technology does not have anti-slip measures and is prone to safety hazards in heavy snow.

[0023] 2. In use, in order to further enhance the stability of the prestressed fish-belly UHPC roof truss structure, multiple diagonal supports are used to distribute the stress intensity of the vertical beams, and multiple protective bars and lateral force resisting bars are used to provide additional support to prevent the roof truss from shifting or overturning under these loads. The protective beams also share the pressure from the upper structure or load on the crossbeams, thereby further improving the stability of the prestressed fish-belly UHPC roof truss.

[0024] 3. During use, after the rain and snow melt, the rain and snow that enter the arc-shaped groove will flow to both ends of the arc-shaped groove under their own gravity and enter the interior of the protective groove. At the same time, through the action of the two arc-shaped rods, the rain and snow flowing from the surface of the fixed block and rectangular block will be diverted into the groove formed between the arc-shaped rods and the fixed block and rectangular block, and then flow out and be collected along the water outlet pipe, effectively preventing the rain and snow on the roof frame from dripping down onto pedestrians.

[0025] 4. When using it, in the construction preparation stage of the prestressed fish belly type UHPC roof truss, first prepare sufficient prestressing tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent and steel fiber that match the roof truss structure, and conduct quality inspection. Then, make templates according to the shape and size of the roof truss, lay the prestressing tendons corresponding to each structure into the corresponding templates, and then fix each supporting structure in the roof truss with reinforcing ribs. Attached Figure Description

[0026] Figure 1 This is a front perspective view of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0027] Figure 2This is a perspective view of the column portion of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0028] Figure 3 This is a perspective view of the roof panel portion of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0029] Figure 4 This is a perspective view of the protective components of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0030] Figure 5 This is a perspective sectional view of the arc-shaped sleeve portion of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0031] Figure 6 This is a perspective view of the fixing block portion of a prestressed fish-belly type UHPC roof truss structure according to the present invention;

[0032] Figure 7 This is a perspective view of the rectangular block portion of a construction method for a prestressed fish-belly type UHPC roof truss according to the present invention.

[0033] Figure 8 This is a three-dimensional sectional view of the load-bearing block portion of a construction method for a prestressed fish-belly type UHPC roof truss according to the present invention.

[0034] Figure 9 This is a perspective view of the crossbeam portion of a construction method for a prestressed fish-belly type UHPC roof truss according to the present invention.

[0035] Figure 10 Another perspective sectional view of the arc-shaped sleeve portion of a construction method for a prestressed fish-belly type UHPC roof truss.

[0036] In the picture:

[0037] 1. Column; 2. Splicing rod; 3. Protective beam; 4. Scissor brace; 5. Reinforcing component; 501. Horizontal beam; 502. Vertical beam; 503. Diagonal brace; 504. Protective rod; 505. Lateral force resisting rod; 506. Roof panel; 507. Connecting rod; 6. Protective component; 601. Arc sleeve; 602. Arc groove; 603. Slot; 604. Fixing block; 605. Lifting plate; 606. Rectangular block; 607. Load-bearing block; 608. First spring; 609. Slide groove; 610. Second spring; 611. Lifting block; 612. Spherical groove; 613. Rectangular groove; 7. Water outlet; 8. Inlet pipe; 9. Arc rod; 10. Protective groove; 11. Water outlet pipe. Detailed Implementation

[0038] 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.

[0039] Example 1: Please refer to Figure 1-10This invention provides a technical solution: a prestressed fish-belly type UHPC roof truss structure, including four columns 1 for bearing the gravity load of the roof truss and its superstructure, and reinforcing components 5 for improving the stability of the fish-belly type UHPC roof truss. A protective component 6 is installed on the top of the reinforcing component 5. The protective component 6 includes an arc-shaped sleeve 601 and two protective grooves 10 for draining rainwater. The arc-shaped sleeve 601 is made of galvanized steel plate. The surface of the arc-shaped sleeve 601 has arc-shaped grooves 602 for facilitating water flow. Multiple slots 603 are formed on the outer surface of the arc-shaped sleeve 601. A rectangular groove 613 is formed on the top of the arc-shaped sleeve 601. Multiple fixing blocks 604 are evenly fixedly installed on the top of the arc-shaped sleeve 601. All the fixed blocks 604 are made of concrete. A lifting plate 605 is slidably embedded inside the arc-shaped groove 602. Multiple rectangular blocks 606, made of concrete, are fixedly connected to the outer surface of the lifting plate 605 to prevent snow from sliding down the top of the fish-belly UHPC roof truss. A load-bearing block 607 for detecting snow accumulation thickness is fixedly installed on the top of the lifting plate 605. Multiple first springs 608 are provided at the bottom of the load-bearing block 607. A sliding groove 609 is formed on the top of the load-bearing block 607. Multiple second springs 610 are provided on the inner bottom surface of the sliding groove 609. A lifting block 611 is slidably connected between the sliding groove 609 and its inner wall. Multiple springs 610 are formed on the top of the lifting block 611. In the spherical water storage tank 612, the tops of the multiple lifting plates 605 respectively extend movably through the outside of the multiple slots 603, and the top of the load-bearing block 607 extends movably through the outside of the rectangular groove 613. The bottom ends of the multiple first springs 608 are fixedly connected to the inner bottom surface of the arc-shaped groove 602, and the top ends of the multiple first springs 608 are fixedly connected to the bottom of the load-bearing block 607. The bottom ends of the multiple second springs 610 are fixedly connected to the inner bottom surface of the sliding groove 609, and the top ends of the multiple second springs 610 are fixedly connected to the bottom of the lifting block 611. The outer surface of the arc-shaped sleeve 601 is provided with multiple water outlet holes 7 near the two side edges, and the inner walls of the multiple water outlet holes 7 are fixedly welded with a guide pipe 8 for leading water out. All of the aforementioned inlet pipes 8 are made of stainless steel. The bottoms of both protective troughs 10 are fixedly connected to outlet pipes 11 for outward water delivery. The top of the arc-shaped sleeve 601, near its two side edges, is fixed with reinforcing ribs to arc-shaped rods 9 for diverting rain and snow. The reinforcing assembly 5 includes multiple horizontal beams 501 for bearing roof loads. The tops of the multiple horizontal beams 501, near their centers, are fixed with reinforcing nails to vertical beams 502 for directly bearing the roof's self-weight and other loads. Multiple diagonal supports 503 for reinforcing the roof truss support are fixed between the opposing outer surfaces of the multiple vertical beams 502. The tops of the multiple horizontal beams 501, near their two side edges, are fixedly connected with multiple protective rods 504 via prestressed ribs.The opposing outer surfaces of the multiple protective rods 504 are each fixed with a lateral force resisting rod 505 by prestressed tendons. The tops of the multiple vertical beams 502 are fixedly connected to the roof panel 506 by prestressed steel bars. The tops of the multiple diagonal supports 503 are fixedly connected to the inner wall of the roof panel 506 by reinforcing ribs. The tops of the multiple protective rods 504 are fixedly connected to the inner wall of the roof panel 506 by reinforcing ribs. The bottoms of the multiple horizontal beams 501 are fixed with two connecting rods 507 for enhancing the stability of the roof truss by reinforcing ribs. The two protective grooves 10 are respectively connected to the two connecting rods by reinforcing ribs. The outer surface of the 507 is fixedly connected. Each pair of the four columns 1 forms a group, and each group of columns 1 is connected to a splicing rod 2 via reinforcing nails. The four columns 1 are divided into two groups. The top of each group of columns 1 is fixedly connected to the bottom of two connecting rods 507. The tops of the two splicing rods 2 are fixedly connected to the bottoms of two connecting rods 507. The bottoms of multiple crossbeams 501 are fixedly connected to protective beams 3 via prestressed tendons. The tops of multiple protective beams 3 near their side edges are fixed with scissor supports 4 for stress dispersion via reinforcing tendons.

[0040] The working principle of this embodiment is as follows: In use, to further enhance the stability of the prestressed fish-belly type UHPC roof truss structure, firstly, the stress intensity of the vertical beam 502 is further dispersed through the action of multiple diagonal supports 503. Then, additional support is provided through the action of multiple protective rods 504 and lateral force resisting rods 505 to prevent the roof truss from shifting laterally or overturning under these loads. Specifically, to further disperse the stress on the horizontal beam 501, the protective beam 3 shares the pressure from the upper structure or load on the horizontal beam 501. Especially when encountering heavy objects, it can effectively disperse the pressure and reduce stress concentration in the main beam. Furthermore, the shear support frame 4 further disperses the stress on the protective beam 3. The strengthening of the roof truss structure further improves the stability of the prestressed fish-belly UHPC roof truss. To prevent large-scale rain and snow accumulation on the roof truss in winter, during heavy snowfall, the rain and snow first fall into the spherical groove 612 under their own gravity, compressing the lifting block 611. When the snow reaches a certain thickness, the lifting block 611 is pressured and moves downward. The outer surface of the lifting block 611 is covered with rubber, which provides a certain degree of protection and prevents rain and snow from penetrating into the rectangular groove 613. The movement of the lifting block 611 compresses multiple second springs 610, causing the accumulated snow to move into the sliding groove 609. The design of the second springs 610... The mechanism allows the snow on the surface of the lifting block 611 to evaporate and then return to its original position. Simultaneously, the weight of the load-bearing block 607 compresses multiple first springs 608, causing the load-bearing block 607 to move downwards. This causes the lifting plate 605 to move towards the inner bottom surface of the arc-shaped groove 602, which in turn moves multiple rectangular blocks 606 into the arc-shaped groove 602. This creates a height difference between each adjacent rectangular block 606 and the fixed block 604, resulting in a concave-convex surface on the top of the roof truss. This effectively prevents large areas of snow accumulated on the top of the roof truss from sliding down and endangering people's lives and property, solving the problem of existing fish-belly type UHPC roof trusses lacking anti-slip measures in heavy snow. To prevent melting snow and rain from dripping onto the roof panel 506 after heavy snowfall, which could pose a safety hazard, the melting snow and rainwater entering the arc-shaped groove 602 flow towards both ends of the groove under their own weight. They then enter the drainage pipe 8 through the water outlet 7 and finally into the protective groove 10. Simultaneously, the two arc-shaped rods 9 guide the snow and rainwater flowing over the surfaces of the fixed block 604 and rectangular block 606 into the groove formed between the arc-shaped rods 9 and the fixed block 604 and rectangular block 606. Under their own weight, the snow and rainwater then flow outwards and are collected along the water outlet pipe 11, effectively preventing snow and rainwater from dripping onto pedestrians.

[0041] Example 2: According to Figure 1-10As shown, a construction method for a prestressed fish-belly type UHPC roof truss includes the following steps:

[0042] The first step is to prepare sufficient prestressed tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fibers that are compatible with the prestressed fish-belly type UHPC roof truss structure, and to conduct quality inspection.

[0043] The second step is to make templates according to the shape and size of the roof truss during the prefabrication stage, and then lay the prestressed tendons corresponding to each structure into the corresponding templates.

[0044] The third step is to pour the mixed UHPC concrete into the formwork. After each support structure of the roof truss is shaped, the prestress of each structure in the UHPC roof truss is tested by applying prestress.

[0045] Step 4: During the on-site installation phase, once the prestress of each structure meets the standard, on-site installation can begin. The four columns 1 are then fixedly connected to the concrete foundation by welding and concrete pouring, and the splicing rods 2 are welded between each pair of adjacent columns 1.

[0046] Step 5: Connect the two connecting rods 507 to the top of the multiple columns 1 on the same side by means of reinforcing ribs. Then, attach the multiple crossbeams 501 between the top of the two connecting rods 507. Then, weld the vertical beam 502, which serves as the main supporting structure, between the inner wall of the roof panel 506 and the top of the crossbeam 501 by means of reinforcing ribs. Finally, connect the multiple protective rods 504 by means of reinforcing ribs.

[0047] Step 6: Connect and fix multiple lateral force resisting rods 505 and diagonal supports 503, then fix the arc sleeve 601 to the bottom of the roof panel 506 through reinforcing ribs, and then connect the two arc rods 9 to the arc sleeve 601 through reinforcing ribs. The connection between the arc sleeve 601 and the lifting plate 605 is prefabricated.

[0048] The working principle of this embodiment is as follows: In the preparation stage of the prestressed fish-belly type UHPC roof truss construction, the prestressing tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fibers that match the prestressed fish-belly type UHPC roof truss structure are first fully prepared and quality inspected. Then, templates are made according to the shape and size of the roof truss, and the prestressing tendons corresponding to each structure are laid into the corresponding templates. The mixed UHPC concrete is then poured into the templates. After each support structure of the roof truss is shaped, resistance strain gauges are installed at the joint positions of each support structure of the UHPC roof truss. By applying prestress, the prestress of each structure in the UHPC roof truss is detected. The working principle of the resistance strain gauge is as follows: During the prestressing process, the support structure of the roof truss will deform and generate strain. The conductive material of the strain gauge will be stretched accordingly, causing changes in the length and cross-sectional area of ​​the strain gauge. According to the formula for resistance: R = L / A, where R is the resistance, L is the length of the conductor, and A is the cross-sectional area. Resistance is directly related to the ductility and geometry of the material. Therefore, the resistance value changes when strain occurs. By measuring the change in resistance ΔR, the corresponding prestress value can be calculated. After the prestress of each structure meets the standard, the four columns 1 are fixedly connected to the concrete foundation by welding and concrete pouring. Then, the splicing rod 2 is welded between each two adjacent columns 1. Then, two connecting rods 507 are connected to the top of multiple columns 1 on the same side by reinforcing ribs. Then, multiple crossbeams 501 are mounted between the tops of the two connecting rods 507. Then, the vertical beam 502, which plays the main supporting role, is welded between the inner wall of the roof panel 506 and the top of the crossbeam 501 by reinforcing ribs. Finally, multiple protective rods 504 are connected by reinforcing ribs. Then, multiple lateral force resisting rods 505 and diagonal supports 503 are connected and fixed. Then, the arc sleeve 601 is fixedly connected to the bottom of the roof panel 506 by reinforcing ribs. Finally, two arc rods 9 are connected to the arc sleeve 601 by reinforcing ribs.

[0049] In this invention, to further enhance the stability of the prestressed fish-belly type UHPC roof truss structure, firstly, the stress intensity of the vertical beam 502 is further dispersed through the action of multiple diagonal supports 503. Then, additional support is provided through the action of multiple protective rods 504 and lateral force resisting rods 505 to prevent the roof truss from shifting or overturning under these loads. The protective beam 3 shares the pressure from the upper structure or load on the crossbeam 501. To prevent large-scale rain and snow accumulation on the roof truss in winter, when heavy snow occurs, the rain and snow first fall into the interior of the spherical groove 612 under their own gravity, compressing the lifting block 611. When the snow accumulation reaches a certain thickness, the lifting block 611 is subjected to pressure and moves downward. The movement of the lifting block 611 causes multiple... The two springs 610 are compressed, causing the accumulated snow to move into the chute 609. Under the weight of the load-bearing block 607, the multiple first springs 608 are compressed, which in turn moves the load-bearing block 607 downward. This causes the lifting plate 605 to move into the bottom surface of the arc-shaped groove 602, which in turn moves the multiple rectangular blocks 606 into the arc-shaped groove 602. This creates a certain height difference between each adjacent rectangular block 606 and the fixed block 604, resulting in a convex-concave surface at the top of the roof truss. To prevent melting snow and rain from dripping everywhere along the roof panel 506 after a heavy snowfall, the snow and rain entering the arc-shaped groove 602 flow towards both ends of the arc-shaped groove 602 under their own weight, flowing along the outlet... Water enters the interior of the inlet pipe 8 through the water hole 7, and finally enters the interior of the protective groove 10. Simultaneously, through the action of the two arc-shaped rods 9, rain and snow flowing over the surfaces of the fixed block 604 and rectangular block 606 are diverted into the groove formed between the arc-shaped rods 9 and the fixed block 604 and rectangular block 606. Under its own gravity, it enters the interior of the protective groove 10, flows outward along the outlet pipe 11, and is collected by external collection equipment. During the construction preparation stage of the prestressed fish-belly UHPC roof truss, the prestressing tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fibers matching the prestressed fish-belly UHPC roof truss structure are first fully prepared and quality inspected. Then, templates are made according to the shape and size of the roof truss, and the prestressing tendons corresponding to each structure are placed... Stress tendons are laid into their corresponding formwork, and the mixed UHPC concrete is poured into the formwork. After each support structure of the roof truss is shaped, resistance strain gauges are installed at the joints of each component of the UHPC roof truss to detect the prestress of each structure. Once the prestress of each structure meets the standard, on-site installation can begin. During installation, the four columns 1 are first fixedly connected to the concrete foundation by welding and concrete pouring. Then, splice rods 2 are welded between each pair of adjacent columns 1. Next, two connecting rods 507 are connected to the tops of multiple columns 1 on the same side by reinforcing ribs. Finally, multiple crossbeams 501 are supported between the tops of the two connecting rods 507.Then, the vertical beam 502, which serves as the main supporting structure, is welded to the inner wall of the roof panel 506 and the top of the crossbeam 501 via reinforcing ribs. Next, multiple protective rods 504 are connected via reinforcing ribs. Then, multiple lateral force resisting rods 505 and diagonal supports 503 are connected and fixed. Finally, the arc-shaped sleeve 601 is fixedly connected to the bottom of the roof panel 506 via reinforcing ribs. Finally, two arc-shaped rods 9 are connected to the arc-shaped sleeve 601 via reinforcing ribs.

[0050] 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 prestressed fish-belly type UHPC roof truss structure, comprising four columns (1) for bearing the gravity load of the roof truss and its superstructure, and a reinforcing component (5) for improving the robustness of the fish-belly type UHPC roof truss. Its features are: The top of the reinforcing component (5) is provided with a protective component (6). The protective component (6) includes an arc-shaped sleeve (601) and two protective grooves (10) for draining rainwater. The arc-shaped sleeve (601) is made of galvanized steel plate. The surface of the arc-shaped sleeve (601) is provided with an arc-shaped groove (602) for facilitating the flow of accumulated water. The outer surface of the arc-shaped sleeve (601) is provided with multiple slots (603). The top of the arc-shaped sleeve (601) is provided with a rectangular groove (613). Multiple fixing blocks (604) are uniformly fixedly installed on the top of the arc-shaped sleeve (601). The multiple fixing blocks (604) are all made of concrete. The interior of the arc-shaped groove (602) A lifting plate (605) is slidably embedded therein. Multiple rectangular blocks (606) for preventing snow from sliding down the top of the fish-belly UHPC roof truss are fixedly connected to the outer surface of the lifting plate (605). The multiple rectangular blocks (606) are made of concrete. A load-bearing block (607) for detecting the thickness of snow accumulation is fixedly installed on the top of the lifting plate (605). Multiple first springs (608) are provided at the bottom of the load-bearing block (607). A sliding groove (609) is opened on the top of the load-bearing block (607). Multiple second springs (610) are provided on the inner bottom surface of the sliding groove (609). A lifting block (611) is slidably connected between the sliding groove (609) and its inner wall. The top of the lifting block (611) is provided with a plurality of spherical grooves (612) for water storage. The tops of the plurality of lifting plates (605) respectively extend through the outside of the plurality of slots (603). The top of the load-bearing block (607) extends through the outside of the rectangular groove (613). The bottom ends of the plurality of first springs (608) are fixedly connected to the inner bottom surface of the arc groove (602). The top ends of the plurality of first springs (608) are fixedly connected to the bottom of the load-bearing block (607). The bottom ends of the plurality of second springs (610) are fixedly connected to the inner bottom surface of the slide groove (609). The top ends of the plurality of second springs (610) are fixedly connected to the bottom of the lifting block (611). The reinforcing component (5) includes multiple beams (501) for bearing loads from the roof. Each beam (501) has a vertical beam (502) for directly bearing the self-weight of the roof and other loads fixedly installed near the center of its top by reinforcing nails. Multiple diagonal supports (503) for reinforcing the roof truss support force are fixed between the opposite outer surfaces of the multiple vertical beams (502). Multiple protective rods (504) are fixedly connected near the two side edges of the top of the multiple beams (501) by prestressed tendons.

2. The prestressed fish-belly type UHPC roof truss structure according to claim 1, characterized in that: The outer surface of the arc sleeve (601) is provided with multiple water outlet holes (7) near the two side edges. The inner walls of the multiple water outlet holes (7) are fixedly welded with a guide pipe (8) for drawing water out. The multiple guide pipes (8) are made of stainless steel. The bottom of the two protective grooves (10) are fixedly connected with a water outlet pipe (11) for conveying water outward. The top of the arc sleeve (601) is fixed with an arc rod (9) for drawing rain and snow through reinforcing ribs near the two side edges.

3. The prestressed fish-belly type UHPC roof truss structure according to claim 2, characterized in that: The opposing outer surfaces of the multiple protective rods (504) are fixed with anti-lateral force rods (505) by prestressed tendons, and the top ends of the multiple vertical beams (502) are fixedly connected with roof panels (506) by prestressed steel bars.

4. The prestressed fish-belly type UHPC roof truss structure according to claim 3, characterized in that: The top ends of the plurality of diagonal supports (503) are fixedly connected to the inner wall of the roof panel (506) by reinforcing ribs, and the top ends of the plurality of protective rods (504) are fixedly connected to the inner wall of the roof panel (506) by reinforcing ribs.

5. The prestressed fish-belly type UHPC roof truss structure according to claim 4, characterized in that: Two connecting rods (507) for strengthening the stability of the roof truss are fixed between the bottoms of the multiple beams (501) by reinforcing ribs. The two protective grooves (10) are respectively fixedly connected to the outer surfaces of the two connecting rods (507) by reinforcing ribs.

6. The prestressed fish-belly type UHPC roof truss structure according to claim 5, characterized in that: The four columns (1) are arranged in pairs, and each pair of columns (1) is connected to a splicing rod (2) by reinforcing nails. The four columns (1) are divided into two groups. The top of each group of columns (1) is fixedly connected to the bottom of two connecting rods (507), and the top of the two splicing rods (2) is fixedly connected to the bottom of two connecting rods (507).

7. The prestressed fish-belly type UHPC roof truss structure according to claim 6, characterized in that: The bottom of each of the multiple crossbeams (501) is fixedly connected to a protective beam (3) by prestressed tendons, and the top of each of the multiple protective beams (3) is fixed with a scissor support frame (4) for dispersing stress by reinforcing ribs near the two side edges.

8. A construction method for a prestressed fish-belly type UHPC roof truss structure, characterized in that, The use of the prestressed fish-belly type UHPC roof truss structure as described in claim 7 includes the following steps: The first step is to prepare sufficient prestressed tendons, cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fibers that are compatible with the prestressed fish-belly type UHPC roof truss structure, and to conduct quality inspection. The second step is to make templates according to the shape and size of the roof truss during the prefabrication stage, and then lay the prestressed tendons corresponding to each structure into the corresponding templates. The third step is to pour the mixed UHPC concrete into the formwork. After each support structure of the roof truss is shaped, the prestress of each structure in the UHPC roof truss is tested by applying prestress. Step 4: During the on-site installation stage, once the prestress of each structure meets the standard, on-site installation can be carried out. Then, the four columns (1) are fixedly connected to the concrete foundation by welding and concrete pouring, and then the splicing rod (2) is welded between each two adjacent columns (1). Step 5: Connect the two connecting rods (507) to the top of multiple columns (1) on the same side by means of reinforcing ribs. Then, attach multiple crossbeams (501) between the top of the two connecting rods (507). Then, weld the vertical beam (502) that serves as the main supporting structure between the inner wall of the roof panel (506) and the top of the crossbeam (501) by means of reinforcing ribs. Finally, connect multiple protective rods (504) by means of reinforcing ribs. Step 6: Connect and fix multiple lateral force resisting rods (505) and diagonal supports (503), then fix the arc sleeve (601) to the bottom of the roof panel (506) through reinforcing ribs, and then connect the two arc rods (9) to the arc sleeve (601) through reinforcing ribs. The connection between the arc sleeve (601) and the lifting plate (605) is prefabricated.

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