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

Abstract

The invention discloses a prestressed fish-bellied UHPC roof truss structure and a construction method thereof, and relates to the field of roof truss structure.The prestressed fish-bellied UHPC roof truss structure comprises four columns used for bearing gravity loads of a roof truss and an upper structure of the roof truss and a reinforcing assembly used for improving firmness of the fish-bellied UHPC roof truss, and a protection assembly is arranged at the top of the reinforcing assembly; the protection assembly comprises an arc-shaped sleeve and two protection grooves used for draining rainwater. When the device is used and in heavy snow weather, rain and snow firstly fall into the spherical groove under the action of self gravity, so that the lifting block moves downwards under pressure, accumulated snow moves into the sliding groove, and then a certain height difference is generated between each rectangular block and the corresponding adjacent fixed block; therefore, a concave-convex switching plate surface is formed at the top of the roof truss, and the problem that in the prior art, a fish-bellied UHPC roof truss has no anti-skid measures for heavy snow weather, and potential safety hazards are likely to be caused is solved.

Description

Technical Field

[0001] The invention relates to the technical field of roof truss structures, and in particular to a prestressed fish-belly UHPC roof truss structure and a construction method thereof. Background Art

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

[0003] In the prior art, in order to effectively disperse the load applied to the roof truss and make the 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 cracks in the structure. However, when encountering heavy snow weather, the top of the prestressed fish-belly UHPC roof truss structure is high and the two sides are low, and most of them do not have the function of blocking and protecting objects from falling. When encountering blizzard weather, it is easy to cause large pieces of snow stranded on the top of the roof to slide down under the influence of its own gravity. Since the large area of ​​snow has a large gravity, when it slides from the roof, it is easy to have a certain impact on people's life and property safety.

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

[0005] The object of the present invention is to provide a prestressed fish-belly UHPC roof truss structure and a construction method thereof, so as to solve the problem that the fish-belly UHPC roof truss proposed in the above background technology has no anti-slip measures in heavy snow weather and is likely to cause safety hazards.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prestressed fish-belly UHPC roof truss structure, comprising four columns for bearing the gravity load of the roof truss and its upper structure and a reinforcing component for improving the firmness of the fish-belly UHPC roof truss, a protective component is arranged on the top of the reinforcing component, the protective component comprises an arc-shaped sleeve and two protective grooves for draining rainwater, the arc-shaped sleeve is made of galvanized steel plate, the surface of the arc-shaped sleeve is provided with an arc-shaped groove for facilitating the flow of accumulated water, the outer surface of the arc-shaped sleeve is provided with a plurality of slots, the top of the arc-shaped sleeve is provided with a rectangular groove, and the arc-shaped sleeve is provided with a plurality of slots. A plurality of fixed blocks are evenly fixedly installed on the top, and the plurality of fixed blocks are made of concrete. A lifting plate is slidably embedded inside the arc-shaped groove, and a plurality of rectangular blocks for preventing snow on the top of the fish-belly UHPC roof truss from sliding down are fixedly connected to the outer surface of the lifting plate. The plurality of rectangular blocks are made of concrete. A load-bearing block for detecting the thickness of snow accumulation is fixedly installed on the top of the lifting plate, and a plurality of first springs are arranged at the bottom of the load-bearing block, a slide groove is opened on the top of the load-bearing block, and a plurality of second springs are arranged on the inner bottom surface of the slide groove, and a lifting block is slidably connected between the slide groove and the inner wall.

[0007] Preferably, a plurality of spherical grooves for storing water are provided on the top of the lifting block, the tops of the plurality of lifting plates are movably connected to the outside of the plurality of card slots, the top of the load-bearing block is movably connected to the outside of the rectangular slot, the bottom ends of the plurality of first springs are fixedly connected to the inner bottom surface of the arc-shaped slot, 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 slide slot, 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 a plurality of water outlet holes near the edges on both sides, the inner walls of the plurality of water outlet holes are fixedly welded with guide pipes for drawing out water, the plurality of guide pipes are made of stainless steel, the bottoms of the two protective grooves are fixedly connected with water outlet pipes for conveying water outward, and the top of the arc-shaped sleeve is fixed with arc rods for draining rain and snow through reinforcing ribs near the edges on both sides.

[0009] Preferably, the reinforcement assembly includes a plurality of cross beams for bearing the load from the roof, and a vertical beam for directly bearing the deadweight of the roof and other loads is fixedly installed near the center of the top of the plurality of cross beams by reinforcement nails, and a plurality of oblique supports for strengthening the supporting force of the roof truss are fixed between the opposite outer surfaces of the plurality of vertical beams, and a plurality of protective rods are fixedly connected to the top of the plurality of cross beams near the edges on both sides by prestressed tendons.

[0010] Preferably, the opposing outer surfaces of the plurality of protection bars are fixed with lateral force resisting bars via prestressed tendons, and the top ends of the plurality of vertical beams are fixedly connected with roof panels via prestressed steel bars.

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

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

[0013] Preferably, every two adjacent ones of the four columns form a group, and the outer surfaces of the columns in each group are fixedly connected with splicing rods through reinforcing nails. The four columns are divided into two groups, and the tops of the columns in each group are fixedly connected to the bottoms of two connecting rods, and the tops of the two splicing rods are fixedly connected to the bottoms of two connecting rods.

[0014] Preferably, the bottoms of the plurality of cross beams are fixedly connected to protective beams via prestressed tendons, and the tops of the plurality of protective beams are fixed with scissor support frames for dispersing stress via reinforcing ribs near both side edges.

[0015] A construction method for a prestressed fish-belly UHPC roof truss comprises the following steps: first, fully preparing prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducing agent, and steel fiber that match the prestressed fish-belly UHPC roof truss structure, and conducting quality inspection;

[0016] The second step is to make a template according to the shape and size of the roof truss during the prefabricated component production stage, and lay the prestressed tendons corresponding to each structure into the corresponding template;

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

[0018] Step 4: When the prestress of each structure meets the standard during the on-site installation stage, on-site installation can be carried out. Then, the four columns are fixedly connected to the concrete foundation by welding and concrete pouring, and then the splicing rods are welded between every two adjacent columns.

[0019] Step 5: Connect the two connecting rods to the tops of multiple columns on the same side through reinforcing ribs, then connect multiple beams between the tops of the two connecting rods, and then weld the vertical beams that serve as the main supporting structure between the inner wall of the roof panel and the top of the beams through reinforcing ribs, and finally connect multiple guard rods through reinforcing ribs;

[0020] Step 6. Connect and fix multiple lateral force resisting rods and diagonal supports, then fix the arc sleeve to the bottom of the roof panel through reinforcing ribs, and then connect the two arc rods to the arc sleeve through reinforcing ribs. Among them, the connection between the arc sleeve and the lifting plate is prefabricated in advance.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. During use, when encountering heavy snow, rain and snow first fall into the inside of the spherical groove under the action of their own gravity, so that the lifting block moves downward under pressure, thereby causing the accumulated snow to move to the inside of the slide, thereby causing a certain height difference between each adjacent rectangular block and the fixed block, so that the top of the roof frame forms a concave and convex switching plate surface, which solves the problem that the fish-belly UHPC roof frame in the prior art has no anti-slip measures in response to heavy snow weather, which is easy to cause safety hazards.

[0023] 2. During use, in order to further enhance the stability of the prestressed fish-belly UHPC roof truss structure, multiple inclined supports are used to disperse the force strength of the vertical beams, and multiple protective rods and lateral force rods are used to provide additional support to prevent the roof truss from shifting or overturning under these loads. The protective beams can share the pressure from the upper structure or load for the cross beams, thereby further improving the stability of the prestressed fish-belly UHPC roof truss.

[0024] 3. When in use, after the rain and snow melt, the rain and snow that enter the arc groove will flow to the two ends of the arc groove under the action of its own gravity and enter the interior of the protective groove. At the same time, through the action of the two arc rods, the rain and snow flowing through the surface of the fixed block and the rectangular block will be drained into the gully formed by the arc rod and the fixed block and the rectangular block, and will flow out along the outlet pipe and be collected, effectively preventing the rain and snow on the frame from dripping down onto pedestrians.

[0025] 4. When in use, during the construction preparation stage of the prestressed fish-belly UHPC roof truss, first prepare the prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducer, and steel fiber that match the roof truss structure, and conduct quality inspection. Then, make the template according to the shape and size of the roof truss, lay the prestressed tendons corresponding to each structure into the corresponding template, and then fix each supporting structure in the roof truss with reinforcement ribs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2This is a three-dimensional diagram of the column part of a prestressed fish-belly UHPC roof truss structure of the present invention;

[0028] Figure 3 A three-dimensional diagram of a roof panel portion of a prestressed fish-belly UHPC roof truss structure of the present invention;

[0029] Figure 4 A three-dimensional diagram of a protective component of a prestressed fish-belly UHPC roof truss structure of the present invention;

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

[0031] Figure 6 This is a three-dimensional diagram of the fixed block part of a prestressed fish-belly UHPC roof truss structure of the present invention;

[0032] Figure 7 A rectangular block partial stereogram of a construction method of a prestressed fish-belly UHPC roof truss according to the present invention;

[0033] Figure 8 It is a partial cross-sectional stereoscopic diagram of a load-bearing block of a construction method of a prestressed fish-belly UHPC roof truss of the present invention;

[0034] Fig. 9 A three-dimensional diagram of the crossbeam portion of a construction method of a prestressed fish-belly UHPC roof truss according to the present invention;

[0035] Fig.10 A three-dimensional cross-sectional view from another angle of the arc sleeve part of the invention for a construction method of a prestressed fish-belly UHPC roof truss.

[0036] In the figure:

[0037] 1. Column; 2. Splicing rod; 3. Protection beam; 4. Scissor support frame; 5. Strengthening component; 501. Horizontal beam; 502. Vertical beam; 503. Oblique support; 504. Protection rod; 505. Anti-lateral force rod; 506. Roof panel; 507. Connecting rod; 6. Protection component; 601. Arc sleeve; 602. Arc groove; 603. Card groove; 604. Fixed 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. Guide pipe; 9. Arc rod; 10. Protection groove; 11. Water outlet pipe. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described 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 creative work are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figure 1-10The present invention provides a technical solution: a prestressed fish-belly UHPC roof truss structure, comprising four columns 1 for bearing the gravity load of the roof truss and its upper structure and a reinforcing component 5 for improving the firmness of the fish-belly UHPC roof truss, a protective component 6 is arranged on the top of the reinforcing component 5, the protective component 6 comprises an arc sleeve 601 and two protective grooves 10 for draining rainwater, the arc sleeve 601 is made of galvanized steel plate, the surface of the arc sleeve 601 is provided with an arc groove 602 for facilitating the flow of accumulated water, the outer surface of the arc sleeve 601 is provided with a plurality of card grooves 603, the top of the arc sleeve 601 is provided with a rectangular groove 613, the top of the arc sleeve 601 is evenly fixed with a plurality of fixing blocks 604, and the plurality of fixing blocks 604 are evenly fixed on the top of the arc sleeve 601. The fixed blocks 604 are all made of concrete. A lifting plate 605 is slidably embedded inside the arc-shaped groove 602. The outer surface of the lifting plate 605 is fixedly connected with a plurality of rectangular blocks 606 for preventing snow on the top of the fish-belly UHPC roof frame from sliding down. The plurality of 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. A plurality of first springs 608 are arranged at the bottom of the load-bearing block 607. A slide groove 609 is provided on the top of the load-bearing block 607. A plurality of second springs 610 are arranged on the inner bottom surface of the slide groove 609. A lifting block 611 is slidably connected between the slide groove 609 and the inner wall. The top of the lifting block 611 is provided with a plurality of springs for The spherical groove 612 for storing water, the tops of the plurality of lifting plates 605 are movable and penetrated to the outside of the plurality of slots 603, the top of the bearing block 607 is movable and penetrated to 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 tops of the plurality of first springs 608 are fixedly connected to the bottom of the 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 tops of the plurality of second springs 610 are fixedly connected to the bottom of the lifting block 611, the outer surface of the arc sleeve 601 is provided with a plurality of water outlet holes 7 near the edges on both sides, the inner walls of the plurality of water outlet holes 7 are fixedly welded with a guide pipe 8 for leading water out, The plurality of guide pipes 8 are made of stainless steel, the bottoms of the two protection grooves 10 are fixedly connected with water outlet pipes 11 for conveying water outward, the top of the arc sleeve 601 near the edges on both sides are fixed with arc rods 9 for draining rain and snow through reinforcing ribs, the reinforcing assembly 5 includes a plurality of beams 501 for bearing the load from the roof, the tops of the plurality of beams 501 are fixed with vertical beams 502 for directly bearing the dead weight of the roof and other loads near the center through reinforcing nails, a plurality of oblique supports 503 for strengthening the supporting force of the roof truss are fixed between the opposite outer surfaces of the plurality of vertical beams 502, and a plurality of protection rods 504 are fixedly connected with the tops of the beams 501 near the edges on both sides through prestressed ribs,The opposite outer surfaces of the plurality of protection bars 504 are fixed with lateral force rods 505 through prestressed tendons, the tops of the plurality of vertical beams 502 are fixedly connected with roof panels 506 through prestressed steel bars, the tops of the plurality of inclined supports 503 are fixedly connected with the inner wall of the roof panel 506 through reinforcing ribs, the tops of the plurality of protection bars 504 are fixedly connected with the inner wall of the roof panel 506 through reinforcing ribs, two connecting rods 507 for strengthening the stability of the roof truss are fixed between the bottoms of the plurality of cross beams 501 through reinforcing ribs, and the two protection grooves 10 are respectively connected with the two connecting rods through reinforcing ribs. The outer surface of the four columns 1 is fixedly connected, and each adjacent two of the four columns 1 form a group. The outer surfaces of each group of the columns 1 are fixedly connected with a splicing rod 2 through a reinforcing nail. The four columns 1 are divided into two groups. The top of each group of the columns 1 is fixedly connected to the bottom of the two connecting rods 507, and the tops of the two splicing rods 2 are fixedly connected to the bottom of the two connecting rods 507. The bottoms of the multiple cross beams 501 are fixedly connected with a protective beam 3 through prestressed tendons. The tops of the multiple protective beams 3 are fixed with a scissor support frame 4 for dispersing stress through reinforcing ribs near the edges on both sides.

[0040] Working principle of this embodiment: When in use, in order to further enhance the stability of the prestressed fish-belly UHPC roof truss structure, firstly, the force strength of the vertical beam 502 can be further dispersed through the action of multiple oblique supports 503, and then additional support is provided through the action of multiple protective rods 504 and anti-lateral force rods 505 to prevent the roof truss from shifting sideways or overturning under these loads. In order to further disperse the force of the cross beam 501, the pressure from the upper structure or load is shared by the cross beam 501 through the action of the protective beam 3, especially when encountering heavy objects, which can effectively disperse the pressure and reduce the stress concentration of the main beam. In particular, the force of the protective beam 3 is further dispersed through the action of the scissors support frame 4, which is effective. The roof truss structure is now strengthened, thereby further improving the stability of the prestressed fish-belly UHPC roof truss. In order to prevent a large area of ​​rain and snow from piling up on the roof truss in winter, when encountering heavy snow weather, the rain and snow first fall into the inside of the spherical groove 612 under the action of their own gravity, squeezing the lifting block 611. When the snow reaches a certain thickness, the lifting block 611 is pressed and moves downward. The outer surface of the lifting block 611 is wrapped with rubber material, which has a certain protective effect and can prevent rain and snow from penetrating into the interior of the rectangular groove 613. The movement of the lifting block 611 compresses the multiple second springs 610, thereby causing the accumulated snow to move to the inside of the slide chute 609. The second spring 610 is designed to The lifting block 611 is arranged so that the snow on the surface of the lifting block 611 can be reset after evaporation. At the same time, the multiple first springs 608 are compressed under the gravity of the load-bearing block 607, thereby driving the load-bearing block 607 to move downward, so that the lifting plate 605 moves toward the inner bottom surface of the arc groove 602, and then drives the multiple rectangular blocks 606 to move inside the arc groove 602, so that a certain height difference is generated between each adjacent rectangular block 606 and the fixed block 604, so that the top of the roof frame forms a concave and convex switching plate surface, which effectively prevents the large area of ​​snow trapped on the top of the roof frame from sliding down and affecting the safety of people's lives and property, and solves the problem that the fish-belly UHPC roof frame in the prior art has no anti-slip measures for heavy snow weather. The problem of easily causing safety hazards is that in order to prevent the melted rain and snow after heavy snow from dripping everywhere along the roof panel 506, when the rain and snow melt, the rain and snow that enter the arc groove 602 flows to the two ends of the arc groove 602 under the action of its own gravity, enters the inside of the guide pipe 8 along the water outlet 7, and finally enters the inside of the protective groove 10. At the same time, through the action of the two arc rods 9, the rain and snow flowing through the surface of the fixed block 604 and the rectangular block 606 are drained into the gully formed between the arc rod 9 and the fixed block 604 and the rectangular block 606, and enters the inside of the protective groove 10 under the action of its own gravity, flows out along the water outlet pipe 11 and is collected, effectively preventing the rain and snow on the house frame from dripping down onto pedestrians.

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

[0042] The first step is to fully prepare the prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducing agent, and steel fiber that match the prestressed fish-belly UHPC roof truss structure, and conduct quality inspection;

[0043] The second step is to make a template according to the shape and size of the roof truss during the prefabricated component production stage, and lay the prestressed tendons corresponding to each structure into the corresponding template;

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

[0045] Step 4: When the prestress of each structure meets the standard during the on-site installation stage, 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 every two adjacent columns 1;

[0046] Step 5: Connect two connecting rods 507 to the tops of multiple columns 1 on the same side through reinforcing ribs, then connect multiple cross beams 501 between the tops of the two connecting rods 507, and 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 cross beam 501 through reinforcing ribs, and finally connect multiple protection rods 504 through 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 in advance.

[0048] The working principle of this embodiment: in the construction preparation stage of the prestressed fish-belly UHPC roof truss, firstly, the prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducing agent and steel fiber matching the prestressed fish-belly UHPC roof truss structure are fully prepared and quality inspected, and then a template is made according to the shape and size of the roof truss, and the prestressed tendons corresponding to each structure are laid into the template corresponding to it, and the mixed UHPC concrete is poured into the template. After each supporting structure of the roof truss is finalized, a resistance strain gauge is installed at the joint position of each supporting structure of the UHPC roof truss, and the prestress of each structure in the UHPC roof truss is detected by applying prestress, wherein the working principle of the resistance strain gauge is as follows: during the prestress application process, the supporting structure of the roof truss will deform and generate strain, and the conductive material of the strain gauge will stretch accordingly, resulting in changes in the length and cross-sectional area of ​​the strain gauge. According to the resistance formula: R = \frac{L}{A}, wherein 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, when strain occurs, the resistance value will change. By measuring the change in resistance ΔR, the corresponding prestress value can be calculated. When the prestress of each structure meets the standard, 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, and then the two connecting rods 507 are respectively connected to the tops of multiple columns 1 on the same side through reinforcing ribs, and then multiple beams 501 are connected between the tops of the two connecting rods 507, and then the vertical beam 502 that serves as the main supporting structure is welded between the inner wall of the roof panel 506 and the top of the beam 501 through reinforcing ribs, and finally, multiple protective rods 504 are connected through reinforcing ribs, and then multiple lateral force rods 505 and diagonal supports 503 are connected and fixed, and then the arc sleeve 601 is fixedly connected to the bottom of the roof panel 506 through reinforcing ribs, and then the two arc rods 9 are connected to the arc sleeve 601 through reinforcing ribs.

[0049] In the present invention, in order to further enhance the stability of the prestressed fish-belly UHPC roof truss structure, firstly, the force strength of the vertical beam 502 can be further dispersed through the action of multiple oblique supports 503, and then additional support is provided through the action of multiple protective rods 504 and anti-lateral force rods 505 to prevent the roof truss from shifting or overturning under these loads. The protective beam 3 is used to share the pressure from the upper structure or load for the cross beam 501. In order to prevent a large area of ​​rain and snow from piling up on the roof truss in winter, when encountering heavy snow weather, the rain and snow first fall into the inside of the spherical groove 612 under the action of their own gravity, and squeeze the lifting block 611. When the snow reaches a certain thickness, the lifting block 611 is pressed and moves downward. The movement of the lifting block 611 causes multiple The second spring 610 is compressed, so that the accumulated snow moves toward the inside of the slide groove 609. Under the gravity of the load-bearing block 607, the multiple first springs 608 are compressed, which drives the load-bearing block 607 to move downward, so that the lifting plate 605 moves toward the inner bottom surface of the arc groove 602, and then drives the multiple rectangular blocks 606 to move toward the inside of the arc groove 602, so that a certain height difference is generated between each adjacent rectangular block 606 and the fixed block 604, so that the top of the roof frame forms a concave and convex switching board surface. In order to prevent the melted rain and snow after heavy snow from dripping everywhere along the roof panel 506, when the rain and snow melt, the rain and snow that enters the arc groove 602 flows to the two ends of the arc groove 602 under the action of its own gravity, and flows along the outlet The water hole 7 enters the interior of the guide pipe 8, and finally enters the interior of the protective groove 10. At the same time, through the action of the two arc rods 9, the rain and snow flowing through the surface of the fixed block 604 and the rectangular block 606 are drained into the gully formed by the arc rod 9 and the fixed block 604 and the rectangular block 606, and enter the interior of the protective groove 10 under the action of its own gravity, flow out along the outlet pipe 11 and be collected by the external collection equipment. In the preparation stage for the construction of the prestressed fish-belly UHPC roof truss, firstly, the prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducing agent, and steel fiber matching the prestressed fish-belly UHPC roof truss structure are fully prepared and quality inspected, and then the template is made according to the shape and size of the roof truss, and the prestressed corresponding to each structure is placed on the roof truss. The stress reinforcement is laid in the corresponding formwork, and the mixed UHPC concrete is poured into the formwork. After each supporting structure of the roof truss is finalized, a resistance strain gauge is installed at the joint position of each component of the UHPC roof truss through the application of prestress to detect the prestress of each structure in the UHPC roof truss. When the prestress of each structure meets the standard, on-site installation can be carried out. During the installation process, the four columns 1 are first 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, and then the two connecting rods 507 are respectively connected to the tops of multiple columns 1 on the same side through reinforcing ribs, and then multiple beams 501 are connected between the tops of the two connecting rods 507.Then, the vertical beam 502, which serves as the main supporting structure, is welded between the inner wall of the roof panel 506 and the top of the cross beam 501 through the reinforcement ribs, and finally, multiple protection rods 504 are connected through the reinforcement ribs, and then multiple lateral force rods 505 and the oblique support 503 are connected and fixed, and then the arc sleeve 601 is fixedly connected to the bottom of the roof panel 506 through the reinforcement ribs, and then the two arc rods 9 are connected to the arc sleeve 601 through the reinforcement ribs.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed fish-belly UHPC roof truss structure, comprising four columns (1) for bearing the gravity load of the roof truss and its upper structure and a reinforcing component (5) for improving the firmness of the fish-belly UHPC roof truss; Features: A protective component (6) is arranged on the top of the reinforcing component (5), and the protective component (6) comprises 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 a plurality of slots (603). The top of the arc-shaped sleeve (601) is provided with a rectangular groove (613). The top of the arc-shaped sleeve (601) is evenly fixed with a plurality of fixing blocks (604), and the plurality of fixing blocks (604) are all made of concrete. The interior of the arc-shaped groove (602) is provided with a plurality of fixing blocks (604). A lifting plate (605) is slidably embedded, and a plurality of rectangular blocks (606) for preventing snow on the top of the fish-belly UHPC roof frame from sliding downward are fixedly connected to the outer surface of the lifting plate (605), and the plurality of rectangular blocks (606) are made of concrete. A load-bearing block (607) for detecting the thickness of accumulated snow is fixedly installed on the top of the lifting plate (605), and a plurality of first springs (608) are arranged at the bottom of the load-bearing block (607), and a slide groove (609) is provided at the top of the load-bearing block (607), and a plurality of second springs (610) are arranged on the inner bottom surface of the slide groove (609), and a lifting block (611) is slidably connected between the slide groove (609) and the inner wall.

2. The prestressed fish-belly UHPC roof truss structure according to claim 1 is characterized in that: The top of the lifting block (611) is provided with a plurality of spherical grooves (612) for storing water, the tops of the plurality of lifting plates (605) are movably connected to the outside of the plurality of slots (603), the top of the load-bearing block (607) is movably connected to 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), and the top ends of the plurality of second springs (610) are fixedly connected to the bottom of the lifting block (611).

3. The prestressed fish-belly UHPC roof truss structure according to claim 2 is characterized in that: The outer surface of the arc-shaped sleeve (601) is provided with a plurality of water outlet holes (7) near the edges on both sides, and the inner walls of the plurality of water outlet holes (7) are fixedly welded with guide pipes (8) for guiding water out, and the plurality of guide pipes (8) are all made of stainless steel. The bottoms of the two protective grooves (10) are fixedly connected with water outlet pipes (11) for conveying water outward, and the top of the arc-shaped sleeve (601) near the edges on both sides is fixed with arc-shaped rods (9) for draining rain and snow through reinforcing ribs.

4. The prestressed fish-belly UHPC roof truss structure according to claim 3 is characterized in that: The reinforcement assembly (5) comprises a plurality of cross beams (501) for bearing loads from the roof, a plurality of vertical beams (502) for directly bearing the deadweight of the roof and other loads are fixedly installed near the center of the top of the plurality of cross beams (501) by reinforcement nails, a plurality of oblique supports (503) for strengthening the supporting force of the roof truss are fixed between the opposite outer surfaces of the plurality of vertical beams (502), and a plurality of protective rods (504) are fixedly connected near the edges on both sides of the top of the plurality of cross beams (501) by prestressed tendons.

5. The prestressed fish-belly UHPC roof truss structure according to claim 4 is characterized in that: The opposing outer surfaces of the plurality of protection bars (504) are fixed with lateral force resisting bars (505) via prestressed bars, and the top ends of the plurality of vertical beams (502) are fixedly connected with roof panels (506) via prestressed bars.

6. The prestressed fish-belly UHPC roof truss structure according to claim 5 is characterized in that: The top ends of the plurality of inclined supports (503) are fixedly connected to the inner wall of the roof panel (506) via reinforcing ribs, and the top ends of the plurality of protection rods (504) are fixedly connected to the inner wall of the roof panel (506) via reinforcing ribs.

7. The prestressed fish-belly UHPC roof truss structure according to claim 6 is characterized in that: Two connecting rods (507) for strengthening the stability of the roof truss are fixed between the bottoms of the plurality of cross beams (501) via reinforcing ribs, and the two protection grooves (10) are fixedly connected to the outer surfaces of the two connecting rods (507) via the reinforcing ribs, respectively.

8. The prestressed fish-belly UHPC roof truss structure according to claim 7 is characterized in that: Each adjacent two of the four columns (1) form a group, and the outer surfaces of each group of columns (1) are fixedly connected with splicing rods (2) via reinforcing nails. The four columns (1) are divided into two groups, and the tops of the columns (1) in each group are respectively fixedly connected to the bottoms of two connecting rods (507), and the tops of the two splicing rods (2) are respectively fixedly connected to the bottoms of the two connecting rods (507).

9. The prestressed fish-belly UHPC roof truss structure according to claim 8 is characterized in that: The bottoms of the plurality of cross beams (501) are fixedly connected to the protection beams (3) via prestressed tendons, and the tops of the plurality of protection beams (3) near the two side edges are fixed with scissor support frames (4) for dispersing stress via reinforcing ribs.

10. A construction method for a prestressed fish-belly UHPC roof truss structure, characterized in that: The steps include: The first step is to fully prepare the prestressed tendons and cement, silica fume, quartz sand, high-efficiency water reducing agent, and steel fiber that match the prestressed fish-belly UHPC roof truss structure, and conduct quality inspection; The second step is to make a template according to the shape and size of the roof truss during the prefabricated component production stage, and lay the prestressed tendons corresponding to each structure into the corresponding template; The third step is to pour the mixed UHPC concrete into the formwork. When each supporting structure of the roof truss is finalized, the prestress of each structure in the UHPC roof truss is tested by applying prestress. Step 4: When the prestress of each structure reaches the standard during the on-site installation stage, on-site installation can be carried out. 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 every two adjacent columns (1); Step 5: Connect two connecting rods (507) to the tops of multiple columns (1) on the same side through reinforcing ribs, then connect multiple cross beams (501) between the tops 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 cross beam (501) through reinforcing ribs, and finally connect multiple protection rods (504) through reinforcing ribs; Step 6: Connect and fix multiple lateral force resisting rods (505) and oblique 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 the reinforcing ribs. The connection between the arc sleeve (601) and the lifting plate (605) is prefabricated in advance.

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