Large-span concrete structure with dampers

Abstract

The large-span concrete structure comprises a first structural beam and a second structural beam, the upper portion of the first structural beam and the upper portion of the second structural beam are connected through a structural plate, two H-shaped steel beams which are symmetrical front and back are arranged between the first structural beam and the second structural beam, and frequency modulation mass dampers are installed on the H-shaped steel beams. The lower parts of the first structural beam, the H-shaped steel beam and the second structural beam are connected with a beam plate formwork support body; the left end and the right end of the H-shaped steel beam are connected with the first structural beam and the second structural beam through profile steel embedded parts correspondingly, and the profile steel embedded parts are connected with the H-shaped steel beam through embedded steel plates. A base of the frequency modulation mass damper is welded to the H-shaped steel beam, a temporary bolt and a temporary nut are arranged between the base and the H-shaped steel beam, and two double-channel steel joists are arranged on the H-shaped steel beam and located on the two sides of the frequency modulation mass damper correspondingly. The technical problems that an existing concrete structure is difficult to construct and leakage exists are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically, it relates to a large-span concrete structure with a damper. Background Technology

[0002] With the continuous advancement of building technology, more and more large-scale buildings, such as stadiums, are adopting long-span structures, while the requirements for structural safety and comfort are also increasing. Tuned-frequency mass dampers (TMDs), as a highly efficient vibration reduction technology, have been widely used in long-span stadium projects, demonstrating significant vibration reduction and seismic resistance effects. The spatial structure of long-span stadiums is typically complex, and there may be certain space constraints, resulting in limited installation space for the dampers.

[0003] Traditional dampers are installed after the main structure is completed. This requires pre-planning the damper hoisting needs in the structural slab, pre-reserving hoisting openings, and then sealing these openings after the damper is installed. This process is cumbersome and time-consuming. Furthermore, leaving hoisting openings in the roof slab increases the likelihood of leakage. Once leakage occurs, repairs are difficult, costly, and pose a quality risk. Existing large-span concrete structures with dampers are inconvenient to construct, and the risk of leakage due to the two-stage pouring of the structural slabs necessitates a more convenient, integrally cast large-span concrete structure with dampers. Utility Model Content

[0004] The purpose of this invention is to provide a large-span concrete structure with a damper that can be integrally cast and is easy to construct.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A large-span concrete structure with dampers includes a first structural beam and a second structural beam. The first and second structural beams are connected by a structural slab at the top. Two H-beams are symmetrically arranged between the first and second structural beams. A frequency-modulated mass damper is installed on the H-beams. A beam-slab formwork frame is connected to the lower part of the first structural beam, the H-beams, and the second structural beams.

[0007] The left and right ends of the H-beam are connected to the first structural beam and the second structural beam respectively through embedded steel parts. The embedded steel parts are connected to the H-beam through embedded steel plates.

[0008] The base of the frequency-modulated mass damper is welded to an H-beam, and temporary bolts and nuts are installed between the base and the H-beam. Two double-channel steel support beams are installed on the H-beam, and the two double-channel steel support beams are located on both sides of the frequency-modulated mass damper.

[0009] The beam and slab formwork structure includes several longitudinal steel pipe scaffolds and several transverse steel pipe scaffolds. The longitudinal steel pipe scaffolds include a first steel pipe assembly connecting the bottom of the first structural beam, a second steel pipe assembly connecting the bottom of the second structural beam, and a third steel pipe assembly connecting the bottom of the H-beam.

[0010] The first and second steel pipe assemblies have the same structure, both including a first supporting steel pipe and a first adjusting top support installed on the upper part of the first supporting steel pipe. The third steel pipe assembly includes a second supporting steel pipe and a second adjusting top support installed on the second supporting steel pipe. At least two first square tube main ribs are installed on the first adjusting top support, and at least two second square tube main ribs are installed on the second adjusting top support.

[0011] Each double-channel steel support beam is equipped with a third support steel pipe, and a disc-lock frame top support is installed on the third support steel pipe. At least two second square tube main beams are placed inside the disc-lock frame top support.

[0012] The frequency-modulated mass damper of the large-span concrete structure of this application is welded to an H-shaped steel beam, and temporary bolts and nuts are provided between the base and the H-shaped steel beam. Two double-channel steel support beams are provided on the H-shaped steel beam, and the two double-channel steel support beams are located on both sides of the frequency-modulated mass damper, which makes the frequency-modulated mass damper stable and easy to construct, effectively solving the technical problems of difficult construction and leakage in existing concrete structures.

[0013] This application achieved the goal of saving construction time by improving the construction process, and by installing the damper in advance in one go, the project of reserving hoisting openings was eliminated. This not only avoids the risk of grout leakage from the construction joint of structural slab 3, but also further achieves the goal of saving construction time. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the beam and slab support mold of this utility model.

[0015] Figure 2 This is a schematic diagram of the installation of the frequency modulation mass damper of this utility model.

[0016] Figure 3 This is a schematic diagram of the large-span concrete structure of this utility model.

[0017] Figure 4 yes Figure 3 Enlarged view of part A in the image.

[0018] Figure 5 This is a schematic diagram of the nodes of the steel embedded parts in this application.

[0019] Figure 6 This is a structural schematic diagram of the steel plate embedded in this application.

[0020] Figure 7This is a schematic diagram of the structure of the concave-convex shaped template of this utility model. Detailed Implementation

[0021] like Figure 1-7 As shown, a large-span concrete structure with dampers includes a first structural beam 1 and a second structural beam 2. The first structural beam 1 and the second structural beam 2 are connected above each other by a structural plate 3. Two H-shaped steel beams 4 are arranged symmetrically between the first structural beam 1 and the second structural beam 2. A frequency-modulated mass damper 5 is installed on the H-shaped steel beams 4. The lower parts of the first structural beam 1, the H-shaped steel beams 4 and the second structural beam 2 are connected to a beam-slab formwork frame 6.

[0022] The beam and slab formwork 6 includes several longitudinal steel pipe scaffolds and several transverse steel pipe scaffolds 10. The longitudinal steel pipe scaffolds include a first steel pipe assembly 7 connecting the bottom of the first structural beam 1, a second steel pipe assembly 8 connecting the bottom of the second structural beam 2, and a third steel pipe assembly 9 connecting the bottom of the H-beam 4.

[0023] The first steel pipe assembly 7 and the second steel pipe assembly 8 have the same structure, both including a first supporting steel pipe 11 and a first adjusting top support 12 installed on the upper part of the first supporting steel pipe 11. The third steel pipe assembly 9 includes a second supporting steel pipe 13 and a second adjusting top support 14 installed on the second supporting steel pipe 13. At least two first square tube main ribs 15 are installed on the first adjusting top support 12, and at least two second square tube main ribs 16 are installed on the second adjusting top support 14.

[0024] The left and right ends of the H-beam 4 are connected to the first structural beam 1 and the second structural beam 2 respectively through steel embedded parts 24. The steel embedded parts 24 and the H-beam 4 are connected by embedded steel plates 25. The ends of the H-beam 4 are designed with elliptical holes 17 for adjusting the fixed points, which facilitates the adjustment of the error of the steel embedded parts 24. The H-beam 4 and the steel embedded parts 24 are connected by high-strength bolts at hinge nodes 18.

[0025] The base of the frequency-modulated mass damper 5 is welded to the H-beam 4, and temporary bolts 19 and temporary nuts 20 are provided between the base and the H-beam 4. The frequency-modulated mass damper 5 is welded to the H-beam 4, and M20 bolts + nuts (temporary bolts 19 and temporary nuts 20) are used as temporary fixing measures. Two double-channel steel support beams 21 are provided on the H-beam 4, and the two double-channel steel support beams 21 are located on both sides of the frequency-modulated mass damper 5. Each double-channel steel support beam 21 is provided with a third support steel pipe 22, and a disc-lock frame top support 23 is installed on the third support steel pipe 22. At least two second square tube main ribs 16 are placed inside the disc-lock frame top support 23. The specific construction method of the large-span concrete structure of this application includes the following steps:

[0026] (1) Erect the formwork support frame and lay the bottom formwork of the beam, and then tie the beam reinforcement. Specifically, erect the beam and slab formwork support frame 6 according to the erection parameters of the formwork support system scheme. The beam and slab formwork support frame 6 is supported by the socket-type disc buckle steel pipe scaffold. The supporting steel pipes on the corresponding parts of the frequency-modulated mass damper 5 are adjusted to the bottom elevation of the steel beam. When the steel beam is installed, the corresponding adjustable top support is used for precise adjustment. In addition, in order to facilitate on-site installation, the frequency-modulated mass damper 5 is designed to be installed by the top support type instead of the bottom hanging method. Furthermore, the method of preventing grout leakage of the steel embedded part 24 of the frequency-modulated mass damper 5 is improved. The steel embedded part 24 is increased by 100mm on each side according to the original design size to ensure that the beam side formwork and the steel embedded part 24 are tightly attached. Double-sided tape is applied around the steel embedded part 24 to prevent grout leakage.

[0027] After the bottom formwork of the beam is laid, the frame beam reinforcement is tied. The side formwork of the beam is not closed. The side formwork of the beam is closed after the steel embedded parts 24 are installed and the supporting steel is welded.

[0028] (2) Install the steel embedded parts 24 and weld the embedded ear plates; specifically, according to the position markings on the construction drawings, accurately measure and mark the position of the steel embedded parts 24 in the structural frame beam, and tie or weld the steel embedded parts 24 to the concrete reinforcement (using electric welding or gas welding, etc., and ensuring the welding quality to ensure that the weld is firm and flat). After the steel embedded parts 24 are installed, weld the embedded ear plates. Before welding, clean the welding surface of the ear plates to remove rust, oil, oxides and other debris to ensure the welding quality. First, use spot welding or temporary fixing devices to position the ear plates to ensure that their position is correct. After spot welding is completed, perform full welding.

[0029] (3) Install H-beams 4; Specifically, first measure the horizontal distance between the two H-beams 4 in the reserved space for the installation of the frequency-modulated mass damper 5, and cut and adjust the length of the supporting steel beam of the frequency-modulated mass damper 5 according to the actual measured value; then use lifting equipment (such as a tower crane) to hoist the H-beams 4 to the predetermined position, and fix the H-beams 4 with the template support frame. Adjust the vertical elevation of the H-beams 4 through the adjustable top support at the top of the template support frame to ensure that its vertical and horizontal positions are accurate. After tightening all the bolts at the ends of the steel beams, check whether the bolts at all connection points are tightened evenly and whether there are any looseness, cracks or other problems. Ensure that there are no gaps or misalignments at all bolt connections to ensure that the structural connection is stable.

[0030] (4) Close and reinforce the beam side formwork: Specifically, to facilitate the removal of the beam side formwork, it is necessary to process and install the beam side formwork at the corresponding part of the steel embedded part 24. The perimeter of the steel embedded part 24 is fitted with concave-convex standardized template joints, and double-sided adhesive is applied around the steel embedded part 24 before installing the beam side formwork. The concave-convex standardized template is clipped around the embedded ear plate and tightly attached to the embedded plate of the steel embedded part 24 to prevent concrete leakage. When removing the beam side formwork, first remove the concave template 26 downwards, and then remove the convex templates 27 on both sides.

[0031] (5) Install the frequency-modulated mass damper 5 and weld it in place and apply anti-corrosion and fireproof paint to the weld. Specifically, after the beam side formwork is closed, hoist the frequency-modulated mass damper 5 and weld it to the H-beam 4. Remove rust from the weld and its surrounding area, remove surface rust, oxides and other contaminants, and apply epoxy paint evenly to the weld and its surrounding area. After the first coat, wait for the paint to dry before applying the second coat to ensure that the coating is uniform, complete, and free of bubbles, cracks and sagging.

[0032] (6) Construction of structural formwork at the location where the frequency-modulated mass damper 5 is installed; specifically, a double-channel steel support beam 21 is placed on the H-shaped steel beam 4 where the frequency-modulated mass damper 5 is installed, and a disc-lock frame top support 23 is placed on the double-channel steel support beam 21.

[0033] When laying the formwork, start from the perimeter and close the middle. The bottom formwork of the top slab should be placed on top of the side formwork of the main and secondary beams. Nail the joints tightly and seal them with silicone sealant. This prevents cement mortar from seeping in during concrete pouring and contaminating the underlying frequency modulation mass damper 5. A straight line should be used to check and ensure the corners are straight. Before tying the slab reinforcement, the top slab formwork must be inspected and accepted. Use a 2m straightedge to check the surface flatness. If any areas exceed the standard, adjust the corresponding top supports under the slab to adjust the flatness of the formwork.

[0034] (7) Concrete pouring; Specifically, according to the location of the pump, each construction section is poured from far to near, and the concrete is poured and vibrated in layers from the middle of the beam to both ends. The thickness of each layer is controlled between 450 and 550 mm. According to the pouring efficiency and the volume of concrete for each frame beam, in order to avoid cold joints, two frame beams are poured together each time, and each beam is poured 500 mm at a time, alternating between them. In view of the problem of dense reinforcement in the core area of ​​the beam and column of the large span structure, self-compacting concrete is used for the vertical structure, and the same grade of concrete is used for the horizontal structure to avoid the situation that the dense reinforced concrete is not vibrated in place, and to avoid the formation of intercepting cold joints at the beam-column joint.

[0035] (8) Remove the formwork to complete the construction of the large-span concrete structure with the frequency-modulated mass damper 5. Specifically, when the concrete strength meets the demolding requirements, remove the formwork. First, remove the back ribs and formwork of the beam side and slab bottom around the frequency-modulated mass damper 5, and then remove the beam side formwork and slab bottom formwork of the corresponding part of the frequency-modulated mass damper 5.

[0036] After the main and secondary reinforcement back braces of the steel pipe are removed, the side formwork in contact with the concrete structure is pulled out from three directions: the sides and the bottom. This allows the beam side of the section where the frequency modulation mass damping responder is removed to be easily removed.

[0037] When removing the bottom formwork above the frequency-modulated mass damper 5, first loosen the top support 23 of the bottom plate clamping frame, lower the corresponding square tube main rib to the surface of the frequency-modulated mass damper 5, remove the main and secondary back ribs, and then slowly move the double channel steel support beam 21 horizontally on the top of the H-beam 4. One end of the double channel steel support beam 21 falls between the two H-beams 4, and lower the top support 23 of the clamping frame to the lowest point. Then, the top support 23 of the clamping frame and the double channel steel support beam 21 can be removed. Finally, remove the formwork between the bottom plate and the frequency-modulated mass damper 5, and pull the formwork out horizontally to complete the removal of the formwork and support system of the corresponding part of the frequency-modulated mass damper 5, thereby completing the construction of the large-span concrete structure with the damper.

[0038] This utility model optimizes the construction process of the large-span concrete structure, enabling the damper to be installed before the structural concrete is poured. This reduces the difficulty of secondary installation. Traditionally, dampers are installed after the main structure is completed. Considering the need for damper hoisting, hoisting openings must be pre-reserved in the structural slab 3. After the damper is installed, the hoisting openings are closed, resulting in a complex and time-consuming process. In contrast, the construction method of this application allows the damper to be installed in advance in one go, simplifying the process, saving time, and reducing installation costs. During construction, this utility model utilizes a large-span structural formwork support system to coordinate with the damper hoisting, adjusting the installation accuracy of the damper. Adjustable double-channel steel support beams 21 are used to separate the damper from the upper structural formwork support, achieving disconnection between the damper and the upper structural formwork. This ensures that the bottom formwork can be easily removed after the floor slab concrete is poured. In the design of the high-rise formwork support system, considering the lifting load of the dampers and support beams, the positioning and spacing of the uprights are designed in advance, and the elevation of the top support of the uprights is controlled. The elevation of the damper support steel beam is adjusted using the corresponding top support. This method is convenient, quick, and simple to operate. In addition, considering the pre-embedded deviation of the embedded parts, the support steel beam is designed with adjustable elliptical hole positions 17. The H-shaped steel beam 4 and the embedded steel part 24 adopt high-strength bolt hinged nodes 18, which facilitates the adjustment of the embedded part error. The main keel of the bottom support of the H-shaped steel beam 4 adopts a double-through method with a double-sided passage inside the top support. The damper is hoisted from the top of the H-shaped steel beam 4, and finally the bottom formwork of the structural floor slab is installed. Furthermore, double-channel steel support beams 21 are fixed to the top of the steel beams, and the corresponding top supports are inserted into the double-channel steel support beams 21 as the bottom formwork support system for adjusting the damper. This can effectively improve the stability of the structure and ensure the structural strength. This utility model improves the method of preventing grout leakage of the steel embedded part 24 supporting the damper. The steel embedded part 24 adopts a concave-convex standardized template splicing design around its perimeter, which facilitates template installation and dismantling and provides good grout leakage prevention. During construction, the steel embedded part 24 is extended by 100mm on each side according to the original design. After the embedded part is embedded, ear plates are welded first, double-sided adhesive is applied around the embedded part, and then the beam side formwork and reinforcement system are installed. The concave-convex template 27 is secured around the ear plates of the embedded part, closely adhering to the embedded plate to prevent concrete grout leakage. When removing the beam side formwork, the concave template 26 is removed downwards first, followed by the convex templates 27 on both sides. The side formwork is removed by pulling it out, making dismantling convenient. This application achieves the goal of saving construction time by improving the construction process, and by installing the damper in advance in one go, the project of reserving hoisting openings is eliminated, which not only avoids the risk of grout leakage from the construction joint of the structural slab 3, but also further achieves the goal of saving construction time.

[0039] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A long span concrete structure with dampers, characterized in that: The first structural beam and the second structural beam are connected by a structural plate, two H-shaped steel beams symmetrically arranged between the first structural beam and the second structural beam, and a frequency-tuned mass damper mounted on the H-shaped steel beams; and a beam plate formwork support body is connected to lower portions of the first structural beam, the H-shaped steel beams and the second structural beam; The left and right ends of the H-shaped steel beams are connected to the first structural beam and the second structural beam respectively by steel embedded parts, and the steel embedded parts are connected to the H-shaped steel beams by embedded steel plates; The base of the frequency-tuned mass damper is welded to the H-shaped steel beam, and temporary bolts and nuts are arranged between the base and the H-shaped steel beam; two double-groove steel joists are arranged on the H-shaped steel beam, and the two double-groove steel joists are arranged on the two sides of the frequency-tuned mass damper.

2. The long-span concrete structure with dampers according to claim 1, characterized in that: The beam plate formwork support body comprises a plurality of longitudinal steel pipe scaffolds and a plurality of transverse steel pipe scaffolds, the longitudinal steel pipe scaffold comprises a first steel pipe assembly connected to the bottom of the first structural beam, a second steel pipe assembly connected to the bottom of the second structural beam, and a third steel pipe assembly connected to the bottom of the H-shaped steel beam.

3. The long-span concrete structure with dampers according to claim 2, characterized in that: The first steel pipe assembly and the second steel pipe assembly are identical in structure and each comprises a first supporting steel pipe and a first adjusting jack mounted on the upper portion of the first supporting steel pipe; the third steel pipe assembly comprises a second supporting steel pipe and a second adjusting jack mounted on the second supporting steel pipe; at least two first square-tube main beams are mounted on the first adjusting jack; and at least two second square-tube main beams are mounted on the second adjusting jack.

4. The long-span concrete structure with dampers of claim 3, wherein: A third supporting steel pipe is arranged on each double-groove steel joist, and a disc buckle frame body jack is mounted on the third supporting steel pipe; and at least two second square-tube main beams are placed in the disc buckle frame body jack.

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