Heavy-load large-span capping structure of existing overground sewage treatment plant

Abstract

The invention relates to the technical field of building design, in particular to an existing overground sewage treatment plant heavy-load large-span capping structure which comprises pier columns, joists, vertical shock insulation supports, steel beams and concrete bridge deck slabs which are sequentially arranged from bottom to top, the pier columns are vertically arranged, the joists are transversely and fixedly arranged on the multiple pier columns, and the multiple joists are arranged side by side; the steel beams and the joists are arranged in a crossed mode and fixedly connected through the vertical shock insulation supports. The multiple steel beams are arranged on the joist side by side, and the adjacent steel beams are fixedly connected through the connecting system. The concrete bridge deck is fixedly arranged at the top end of the steel beam and covers a plurality of tank bodies of the sewage treatment plant. The invention provides a set of complete and practical technical scheme for relieving the neighborhood effect, solving the environment-friendly problem of an urban sewage treatment plant and the key technical problem in capping engineering, so that the overall level of related engineering construction is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building design, and in particular to a heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant. Background Art

[0002] With the acceleration of urbanization, the urban center area continues to expand, and many sewage treatment plants originally located in the suburbs are gradually surrounded by urban development and integrated into the city center. The areas around these treatment plants often develop into densely populated residential areas or public activity areas.

[0003] This change has triggered a series of contradictions in urban development. First, sewage treatment plants usually occupy a large area. However, due to their special use, these lands limit the development potential of surrounding areas and are difficult to be used for other purposes, which has an adverse impact on the overall land utilization rate of the city. At the same time, the location and scale of sewage treatment plants also have a negative impact on the surrounding traffic conditions. Due to the large area of ​​the plant, some roads may be occupied or restricted, resulting in poor traffic flow and increased commuting time, which has an adverse impact on the travel convenience and quality of life of surrounding residents.

[0004] In addition, due to the influence of traditional concepts, many citizens have concerns about the environmental quality around sewage treatment plants, especially about water and air quality. This psychological factor further hinders the growth of the real estate market in these areas, leaving land prices with little room for growth. Although sewage treatment plants have taken a variety of measures in their design and operation to reduce direct impacts on the environment, these potential concerns still have an adverse impact on residents' quality of life and happiness index.

[0005] In order to solve these problems, it is imperative to implement the construction of sewage treatment plant structures. However, for the large-scale tanks (such as biological reaction tanks, oxidation ditches, secondary sedimentation tanks, primary sedimentation tanks, etc.) that have been built in sewage treatment plants, the sealing of the tank bodies is often not considered in the original design. Therefore, the design of the covering structure has a large span, ensuring the ability to bear heavy loads, ensuring the operability of construction and installation, and improving the utilization rate of land space. These are the difficulties that must be faced in the construction of such tank covers. Summary of the invention

[0006] Based on the above description, the present invention provides a heavy-loaded and large-span covering structure for an existing above-ground sewage treatment plant to solve the problem of large-span design in the covering project of the sewage treatment plant, ensure that it has sufficient heavy-load bearing capacity and operability of construction and installation, and improve the utilization rate of surrounding land space.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: A heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant comprises piers, joists, vertical seismic isolation bearings, steel beams and concrete bridge decks arranged in sequence from bottom to top, wherein the piers are arranged vertically, the joists are transversely fixed on a plurality of piers, and a plurality of the joists are arranged side by side; the steel beams are arranged crosswise with the joists, and the steel beams are fixedly connected to the joists via the vertical seismic isolation bearings; a plurality of the steel beams are arranged side by side on the joists, and adjacent steel beams are fixedly connected via a coupling system; the concrete bridge deck is fixedly arranged on the top of the steel beam, and the concrete bridge deck covers a plurality of tanks of the sewage treatment plant.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Preferably, the concrete bridge deck comprises a plurality of prefabricated UHPC (Ultra-High Performance Concrete) bridge decks spliced ​​to each other and a plurality of prefabricated mid-span reinforced concrete slabs, the prefabricated UHPC bridge decks are arranged corresponding to the structural support points at the top ends of the steel beams 1, the prefabricated mid-span reinforced concrete slabs are arranged between adjacent prefabricated UHPC bridge decks, and the prefabricated UHPC bridge decks and the prefabricated mid-span reinforced concrete slabs are connected to each other through wet joints.

[0010] Preferably, the steel beam comprises a plurality of sections of I-section steel plate beams, and the plurality of sections of I-section steel plate beams are spliced ​​in sequence along the length direction of the steel beam.

[0011] Preferably, at least two concrete bridge decks are provided, the concrete bridge decks are arranged obliquely, and the higher ends of two adjacent concrete bridge decks are connected by a reinforced concrete slab beam.

[0012] Preferably, the concrete bridge deck is also provided with a drainage system, which includes a planar waterproof layer and a drainage pipe. The top surface of the concrete bridge deck forms multiple slopes, the planar waterproof layer is inclined along the slopes, and a water collection port is provided at the lower end of each slope; the drainage pipe runs through the concrete bridge deck and is connected to the water collection port.

[0013] Preferably, the top surface of the concrete bridge deck is provided with a covering layer and a permeable layer, the top surface of the covering layer forms a multi-section slope, the planar waterproof layer is inclined along the slope; the permeable layer is arranged above the planar waterproof layer.

[0014] Preferably, a filtering mechanism is provided between the water collection port and the water permeable layer.

[0015] Preferably, a deformation joint is provided on the concrete bridge deck, the deformation joint is parallel to the steel beam and vertically penetrates the concrete bridge deck, and a first elastic filling piece is provided in the deformation joint; both side edges of the deformation joint protrude upward, and the protruding parts on both sides of the deformation joint are connected by a metal cover plate, and a retractable folding part is provided on the metal cover plate.

[0016] Preferably, a deformation joint waterproof layer is also provided on the concrete bridge deck, and the deformation joint waterproof layer includes a first waterproof layer, a second waterproof layer and a third waterproof layer which are arranged in sequence from the outside to the inside, and the third waterproof layer is arranged at the bend of the raised portion of the deformation joint, and the first waterproof layer and the second waterproof layer cover the third waterproof layer and the deformation joint, and the first waterproof layer and the second waterproof layer have a folded portion extending into the deformation joint, and a second elastic filling member is provided between the folded portion of the first waterproof layer and the folded portion of the second waterproof layer.

[0017] Preferably, an overhead walkway plate and / or a buffer zone is provided adjacent to the deformation joint.

[0018] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: the present invention introduces a steel-concrete composite beam structure in the design of a large-span cover structure for an existing above-ground sewage treatment plant. The combination of steel beams and concrete support beams can give full play to the compressive properties of concrete and the tensile properties of steel, while reducing the deadweight of the beam body and avoiding the degradation of performance caused by concrete cracking that affects the normal use of the structure. The steel beams and support beams are connected by vertical seismic isolation bearings, which improves the vibration comfort of the overall structure of the building and enhances its seismic resistance, and also effectively avoids disturbances to the existing tank body of the sewage treatment plant. The top surface of the concrete bridge deck can be used to build parks, squares, commercial buildings and other leisure places for citizens to play according to development needs, which improves the utilization rate of land space, alleviates the NIMBY effect of sewage treatment plants, and solves the "environmentally friendly" problem of urban sewage treatment plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of the biological pool and pier arrangement based on an existing above-ground sewage treatment plant provided by an embodiment of the present invention; Figure 2 A schematic diagram of the longitudinal section structure of a heavy-loaded, large-span covered structure of an existing above-ground sewage treatment plant provided by an embodiment of the present invention; Figure 3 A schematic diagram of a three-dimensional structural effect of an existing above-ground sewage treatment plant heavy-loaded large-span covered structure without a concrete bridge deck installed, provided by an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the enlarged structural effect of part A; Figure 5A schematic diagram of the internal effect of a heavy-loaded, large-span covered structure of an existing above-ground sewage treatment plant provided by an embodiment of the present invention; Figure 6 A schematic diagram of a vertical seismic isolation bearing structure provided by an embodiment of the present invention; Figure 7 A schematic diagram of a cross-sectional structure of a heavy-loaded, large-span covered structure of an existing above-ground sewage treatment plant provided by an embodiment of the present invention; Figure 8 A schematic cross-sectional structural diagram of a drainage system provided in an embodiment of the present invention; Fig. 9 A schematic diagram of expansion joint waterproofing provided in an embodiment of the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Steel beam, 2. Pier, 3. Support beam, 4. Bored pile, 5. Concrete bridge deck, 6. Expansion joint, 7. Reinforced concrete slab beam, 8. Biological pool, 9. Second sedimentation tank, 10. Connection system, 11. Vertical seismic isolation bearing, 1101. Upper connection plate, 1102. Multi-layer rubber body, 1103. Lower connection plate, 12. Drain pipe, 13. Water collection port, 1301. Filter mechanism, 14. Permeable layer, 15. Overburden layer, 16. Metal cover plate, 1601. Folding part, 17. Second elastic filling piece, 18. Overhead walkway plate, 19. First elastic filling piece, 20. Plane waterproof layer, 21. Buffer zone, 22. Expansion joint waterproof layer, 2201. First waterproof layer, 2202. Second waterproof layer, 2203. Third waterproof layer. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0023] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0024] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0025] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0026] Figure 1 The figure shows a top view of the layout of part of the tanks of an existing above-ground sewage treatment plant. Figure 1 As shown, the sewage treatment plant contains two groups of biological pools 8, each with a size of about 100x100m, and there is a plant road between the two groups of biological pools 8; each group of biological pools 8 is composed of two biological pools 8, and the size of a single pool is about 50x100m. In addition, the plant contains 8 secondary sedimentation tanks 9, each with a diameter of about 45m. In the process of covering design, if a traditional frame structure is used to cover a single biological pool 8, it is necessary to add about 105 frame columns and thicken the bottom plate. This design has a long construction period and high risk, and affects the process operation and has a large disturbance to the existing pool body.

[0027] See also Figure 2~Figure 5 The embodiment of the present invention provides a heavy-loaded and large-span cover structure for an existing above-ground sewage treatment plant. Figure 2 A schematic diagram of the longitudinal section structure of a heavy-loaded, large-span covered structure of an existing above-ground sewage treatment plant provided by an embodiment of the present invention. Figure 3A schematic diagram of the three-dimensional structure effect of an existing above-ground sewage treatment plant heavy-loaded large-span covered structure without a concrete bridge deck 5 provided by an embodiment of the present invention. Figure 4 for Figure 3 Schematic diagram of the enlarged structure effect of part A in the figure. Figure 5 A schematic diagram of the internal effect of a heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant provided in an embodiment of the present invention.

[0028] like Figure 2~Figure 5 As shown, an embodiment of the present invention provides a heavy-loaded and large-span cover structure of an existing above-ground sewage treatment plant, including piers 2, support beams 3, vertical seismic isolation bearings 11, steel beams 1 and concrete bridge decks 5 arranged in sequence from bottom to top. The piers 2 are arranged vertically, and the piers 2 extend downward to a sufficient depth underground through bored cast-in-place piles 4 to ensure that the piers 2 have sufficient supporting capacity and stability. The support beams 3 are transversely fixedly arranged on multiple piers 2, and multiple piers 2 jointly support a support beam 3, and multiple support beams 3 are arranged side by side. The steel beams 1 and the support beams 3 are arranged vertically and horizontally (for example, the steel beams 1 are perpendicular to the support beams 3), and the steel beams 1 and the support beams 3 are fixedly connected by the vertical seismic isolation bearings 11; multiple steel beams 1 are arranged side by side on the support beams 3, and adjacent steel beams 1 are fixedly connected by a connecting system 10 (for example, a steel crossbeam or a truss). The tops of multiple rows of steel beams 1 form an upward supporting surface. The concrete bridge deck 5 is fixed to the top of the steel beam 1, and the supporting surface formed by the tops of the multiple rows of steel beams 1 provides multi-point support for the concrete bridge deck 5. The concrete bridge deck 5 covers multiple tanks of the sewage treatment plant to achieve a heavy-load and large-span covering effect of the sewage treatment plant.

[0029] It is understandable that concrete materials are often used in frame structures. Concrete has good compressive resistance, but its tensile resistance is weak. As the span increases, a single concrete beam is difficult to meet the structural requirements. In traditional frame structures, reinforced concrete is often used to cover the tank body, which is difficult to have both compressive and tensile resistance. In this embodiment, a large-span cover structure is designed for each tank body of the sewage treatment plant, and the arrangement of the pier 2 is as follows: Figure 1As shown, each row of piers 2 supports a reinforced concrete support beam 3, avoiding the tank body and being arranged outside the tank body. The steel-concrete composite beam structure is introduced, and the combination of the steel beam 1 and the reinforced concrete support beam 3 can give full play to the compressive properties of concrete and the tensile properties of steel. While reducing the dead weight of the beam body, it avoids the performance degradation caused by concrete cracking and affects the normal use of the structure. The steel beam 1 and the support beam 3 are connected by a vertical seismic isolation bearing 11, which improves the vibration comfort of the overall structure of the building and enhances its seismic resistance, and also effectively avoids disturbance to the existing tank body of the sewage treatment plant. The steel beams 1 are connected by a connecting system 10, which improves the structural stability of the steel beam 1. The processing of the combined rigid shear connector is simple, and can effectively ensure the connection performance between the steel beam 1 and the concrete bridge deck 5.

[0030] The cover structure of this embodiment improves the construction technology of the traditional steel-concrete composite beam bridge in the cover project, improves the assembly accuracy of the large-span cover structure, and optimizes its stress performance and connection structure. The large-span structure can withstand heavier second-phase dead loads and generate controllable negative bending moments, has reasonable stress performance, excellent durability, and convenient construction, which has significant advantages over traditional continuous beams.

[0031] The platform on the cover structure can be used to vacate the land and improve the land utilization rate. The top surface of the concrete bridge deck 5 can be used to build a park, square or commercial building for citizens to play according to development needs. For example, a multifunctional ecological sports city square can be built on the cover structure to improve the function of green complex facilities and promote the construction of ecological innovation cities. This embodiment improves the land space utilization rate, alleviates the NIMBY effect of sewage treatment plants, and solves the "environmentally friendly" problem of urban sewage treatment plants.

[0032] In the design of large-span covered structures, vibration comfort is also a crucial consideration. The propagation of seismic waves usually causes significant vibrations, especially the vertical seismic effects on these structures. Under the action of vertical seismic forces, stress concentration will occur inside the structure, causing the stress in local areas to be much higher than normal levels, thereby increasing the risk of structural cracks, deformation and even local instability, affecting the overall stability of the structure and weakening its earthquake resistance.

[0033] Vibration not only comes from earthquakes, but also includes load vibration caused by crowd activities and disturbance force and frequency generated by equipment operation. These vibrations are more frequent in daily use. If they are not effectively controlled, they will affect the comfort of the structure during normal use and weaken its safety and long-term reliability.

[0034] Based on the above considerations, the present invention adopts vertical seismic isolation bearings 11 to connect the support beams 3 and the steel beams 1 of the cover structure to improve the vibration comfort of the structure and enhance its seismic resistance.

[0035] Figure 6 One possible structure of the vertical seismic isolation support 11 is shown. Figure 6 As shown, the vertical seismic isolation bearing 11 includes an upper connecting plate 1101, a multi-layer rubber body 1102 and a lower connecting plate 1103 which are arranged in sequence from top to bottom, wherein the upper connecting plate 1101 is fixedly connected to the steel beam 1, and the lower connecting plate 1103 is fixedly connected to the joist 3. The multi-layer rubber body 1102 is restricted in lateral position by the upper connecting plate 1101 and the lower connecting plate 1103, and has low vertical stiffness, and can achieve the effect of vertical vibration reduction and isolation.

[0036] Figure 6 The vertical seismic isolation bearing 11 shown provides a vertically arranged flexible layer (such as a multi-layer rubber body 1102) between the upper connecting plate 1101 and the lower connecting plate 1103, so that the upper structure can achieve "flexible isolation" under the action of vertical vibration, absorb and attenuate the energy of the vibration, and effectively slow down the vertical transmission of the vibration. The vertical seismic isolation bearing 11 can significantly reduce the vertical acceleration response of the cover structure in an earthquake, reduce structural damage by controlling the vertical deformation, and ensure the overall stability and service life of the cover structure. While improving the seismic performance of the structure, it also helps to reduce the vibration impact on the process equipment and connecting pipes inside the tank body, maintain the continuity and safety of sewage treatment, reduce the interference of noise and vibration to workers, and maintain a good internal environment comfort.

[0037] On the outside of the covered structure, the vertical seismic isolation bearings 11 effectively improve the stability of the public space above the covered structure by reducing the transmission of vibration, reducing the discomfort and potential safety hazards caused by vibration, ensuring the comfort of use of the public space, meeting the multiple functional requirements of the structure, and achieving the coordination and unity of technology and humanities, which helps to improve the overall quality of life in the area and the user experience of the public space.

[0038] In one possible embodiment, the concrete bridge deck 5 includes a plurality of prefabricated UHPC bridge decks and a plurality of prefabricated mid-span reinforced concrete slabs spliced ​​with each other, the prefabricated UHPC bridge decks are arranged corresponding to the structural support points at the top ends of the steel beams 1, and the prefabricated mid-span reinforced concrete slabs are arranged between adjacent prefabricated UHPC bridge decks, that is, the prefabricated mid-span reinforced concrete slabs fill the remaining positions of the concrete bridge deck 5 where no prefabricated UHPC bridge decks are arranged, and the prefabricated UHPC bridge decks and the prefabricated mid-span reinforced concrete slabs are connected to each other by on-site cast longitudinal and transverse wet joints.

[0039] It is understandable that traditional composite beams have deficiencies in assembly efficiency and construction convenience, especially in multi-span continuous beams, where concrete in the negative moment zone is prone to cracking, weakening the rigidity and durability of the structure. In order to meet the performance requirements of the bridge under fatigue loads, the tensile stress amplitude of the steel beam 1 needs to be strictly controlled. Traditional designs are difficult to fully utilize the tensile strength of high-strength steel, limiting its widespread application in building structures. In this embodiment, a prefabricated UHPC bridge deck is connected to the structural support points on the steel beam 1, which can effectively control the cracking of the concrete slab in the negative moment area of ​​the steel-concrete composite beam bridge, and is easy to install and convenient to construct.

[0040] In one possible implementation, Figure 7 As shown in the cross-sectional view, the steel beam 1 includes several sections of I-section steel plate beams, and the several sections of the I-section steel plate beams are sequentially spliced ​​by high-strength bolts along the length direction of the steel beam 1. The steel beam 1 is prefabricated in advance before the construction of the cover structure. When the cover structure is constructed, the prefabricated steel beam 1 can be directly assembled with the prefabricated UHPC bridge deck and the prefabricated mid-span reinforced concrete slab.

[0041] It is understandable that the prefabricated steel beam 1 and the concrete bridge deck 5 are combined in this embodiment, and are designed as an open cross-section with a simple structure, easy assembly, and convenient maintenance. The high-strength steel beam 1 can withstand a greater load, reduce the cross-sectional size of the component, and save building space, which is particularly advantageous in large-span projects. Its lightweight characteristics also help to reduce the deadweight of the structure, reduce the requirements for the foundation, improve the overall seismic performance, and effectively avoid disturbances to the existing pool body. The prefabricated steel beam 1, prefabricated UHPC bridge deck, and prefabricated mid-span reinforced concrete slab are used for assembly, and the construction speed is fast; the prefabricated steel beam 1 and concrete slab can be quickly assembled on site after being processed in the factory, which simplifies the connection structure, improves construction efficiency and convenience, and shortens the construction period.

[0042] Furthermore, the construction method of pre-loading the mid-span is adopted during the assembly process, which generates a tensile stress reserve in the upper flange plate of the steel beam 1 at the fulcrum, effectively reducing the tensile stress in the negative bending moment area of ​​the concrete fulcrum on the steel beam 1, while improving the utilization efficiency of the tensile strength of the steel in the steel beam 1, making the material utilization rate more economical and efficient, reducing resource waste and reducing costs. The large-span cover structure obtained by this construction method can withstand heavier second-phase dead loads and generate controllable negative bending moments, with reasonable force performance, excellent durability, and convenient construction, which has significant advantages over traditional continuous beams.

[0043] In one possible implementation, Figure 2As shown, the covered structure is provided with at least two concrete bridge decks 5, which are slightly inclined and have opposite inclination directions. The adjacent end heights of the two concrete bridge decks 5 are higher than the distal end heights thereof, and the higher ends of the two adjacent concrete bridge decks 5 are connected by a reinforced concrete slab beam 7.

[0044] by Figure 1 Taking the layout of the biological pool 8 shown as an example, the large-span covered structure adopts a two-way slope structure, in which the longitudinal span of a single slope is close to 100 meters. In the traditional single-slope drainage design scheme, the longitudinal span of the slope is close to 200 meters, which will cause the slope to be too long. If a one-way slope is used for drainage, when there is a large amount of water, the drainage pipe located below will accumulate more water and the drainage pressure will be greater, which will easily lead to excessive head pressure. This situation not only causes a significant impact on the drainage system, but may also cause water flow overspeed, overflow or damage to the drainage pipe, increase maintenance difficulty and construction cost. Therefore, the traditional single-slope drainage design is difficult to meet engineering needs. This embodiment designs a two-way slope to disperse the drainage, so that the water flow is discharged in two directions, reduces the pipe pressure of the drainage system, and improves the life of the drainage system.

[0045] A planting flat roof design can be used for the platform above the concrete bridge deck 5. While increasing the green coverage rate, effective waterproofing measures must be taken to prevent leakage, taking into account the principles of "the soil must be solid, the water must be drained smoothly, and the grass must be planted alive". A reasonable drainage system and waterproofing measures should be selected to ensure that rainwater is quickly discharged to avoid damage to the structure and vegetation caused by accumulated water.

[0046] In order to solve the above problem, in one possible implementation, as Figure 8 As shown, the concrete bridge deck 5 is also provided with a drainage system, which includes a planar waterproof layer 20 and a drainage pipe 12. The top surface of the concrete bridge deck 5 forms multiple slopes, and the planar waterproof layer 20 is inclined along the slopes. A water collection port 13 is provided at the lower end of each slope. The drainage pipe 12 runs through the concrete bridge deck 5 and is connected to the water collection port 13.

[0047] It can be understood that the present embodiment adopts a segmented drainage scheme, dividing the overall slope on the concrete bridge deck 5 into a number of small slope sections, each small slope section being a drainage area, and each drainage area being provided with an independent water collection port 13. By rationally arranging a plurality of drainage nodes, decentralized drainage of the covered structure is achieved. As a preferred scheme, a covering layer 15 and a permeable layer 14 are provided on the top surface of the concrete bridge deck 5, and the top surface of the covering layer 15 forms a multi-segment slope, and the planar waterproof layer 20 is arranged obliquely along the multi-segment slope; the permeable layer 14 is arranged above the planar waterproof layer 20. The slope can be reasonably controlled by constructing a segmented slope with the permeable layer 14 of the upper planted roof and the slope of the lower covering layer 15. In order to prevent foreign objects from clogging the drain pipe 12 and causing drainage failure, a filtering mechanism 1301, such as a filter screen, a floor drain, a convex filter cover, etc., is further provided between the water collection port 13 and the permeable layer 14. The filtering mechanism 1301 can prevent external objects from entering the drain pipe 12, thereby improving the drainage efficiency of each drainage node.

[0048] The drainage system design of this embodiment not only effectively reduces the water flow speed and impact force during drainage, but also reduces the height difference between sections, reducing the difficulty of construction and maintenance. The segmented drainage system also avoids the problem of excessive water flow load at lower heights caused by centralized drainage, ensuring the stable operation of the entire drainage system and preventing rainwater accumulation and leakage.

[0049] In one possible implementation, Fig. 9 As shown, the concrete bridge deck 5 is provided with a deformation joint 6, the deformation joint 6 is parallel to the steel beam 1 and vertically penetrates the concrete bridge deck 5, and a first elastic filler 19, such as a polystyrene foam material, is provided in the deformation joint 6. The edges of both sides of the deformation joint 6 are convex upward, and the convex parts on both sides of the deformation joint 6 are connected by a metal cover plate 16, and a retractable folding part 1601 is provided on the metal cover plate 16.

[0050] It is understandable that the deformation joint 6 is a gap of appropriate width artificially set to prevent the building from being deformed, cracked or even damaged under the action of external factors. The purpose of setting the deformation joint 6 is to avoid and prevent the building from cracking, which in turn causes damage and cracks. The polyethylene foam plastic (first elastic filler 19) filled in the deformation joint 6 has good compression deformation characteristics, can absorb the relative displacement of the structures on both sides, and provide a buffering effect. The closed-cell structure formed by the first elastic filler 19 and the deformation joint 6 effectively blocks the water penetration from above, plays a waterproof and moisture-proof role, and protects the building structure from moisture. The metal cover plate 16 is buckled on the top of the deformation joint 6, and the joint is filled with sealing material. The metal cover plate 16 has high durability and corrosion resistance, provides an additional physical barrier, can resist the erosion of the external environment for a long time, prevents dust or debris from entering the deformation joint 6, and avoids problems such as poor drainage caused by the accumulation of debris. In addition, the retractable folding portion 1601 on the metal cover plate 16 helps to disperse and relieve stress concentration during structural displacement. After being combined with the sealing material, it can better adapt to the subtle deformation of the structure and ensure the overall sealing and protection effect.

[0051] Effective waterproofing measures are of great significance for protecting the covered structure from moisture, maintaining the stability of the internal environment, extending the service life of the building, and reducing subsequent maintenance costs. The deformation joint 6 is a key structure set up to cope with the deformation of the building structure caused by temperature changes or earthquakes. Once the deformation joint 6 leaks, it will cause moisture corrosion of the surrounding building materials, weaken the stability and durability of the structure, increase the subsequent maintenance costs, and the humid environment may also breed mold, further aggravating the damage. Therefore, in the design and construction of the structure, strict attention must be paid to the waterproof performance of the deformation joint 6 to ensure the stability and durability of the structure.

[0052] like Fig. 9 In the embodiment shown, the concrete bridge deck 5 is further provided with a deformation joint waterproof layer 22, which includes a first waterproof layer 2201, a second waterproof layer 2202 and a third waterproof layer 2203 arranged in sequence from the outside to the inside, the third waterproof layer 2203 is arranged at the bend of the convex part of the deformation joint 6, the first waterproof layer 2201 and the second waterproof layer 2202 cover the third waterproof layer 2203 and the deformation joint 6, and the first waterproof layer 2201 and the second waterproof layer 2202 have a folded portion extending into the deformation joint 6, and a second elastic filling member 17, such as a polystyrene foam material, is arranged between the folded portion of the first waterproof layer 2201 and the folded portion of the second waterproof layer 2202. The first waterproof layer 2201 and the second waterproof layer 2202, and the second waterproof layer 2202 and the third waterproof layer 2203 are firmly bonded.

[0053] It is understandable that the third waterproof layer 2203 can raise the position of the bend of the convex part of the deformation joint 6, so that the surface of the deformation joint waterproof layer 22 at the bend is sloped, which is conducive to the flow of water along the inclined surface of the deformation joint waterproof layer 22, prevents water accumulation at the bend, and can enhance the waterproof effect at this place. The first waterproof layer 2201 and the second waterproof layer 2202 wrap the deformation joint 6 and form a double-layer waterproof, providing continuous enhanced waterproofing for the deformation joint 6. The folds of the first waterproof layer 2201 and the second waterproof layer 2202 extend into the deformation joint 6, and their flexible characteristics enable them to adapt to the opening and closing deformation of the deformation joint 6, maintain continuous waterproofing function, enhance the durability and overall protection performance of the deformation joint 6, and also help to extend the service life of the structure. The second elastic filling member 17 (polyethylene foam plastic) arranged between the folds of the first waterproof layer 2201 and the folds of the second waterproof layer 2202 has good compression deformation characteristics, can absorb the relative displacement of the structures on both sides, and provide a buffering effect. The second elastic filling piece 17 also presses the second waterproof layer 2202 into the deformation joint 6, thereby increasing the sealing between the waterproof layer and the deformation joint 6. Combined with the metal cover above, it can prevent dust or debris from entering the deformation joint 6, effectively blocking water penetration, playing a role in waterproofing and moisture-proofing, and ensuring the overall sealing and protection effect.

[0054] In one possible implementation, Fig. 9 As shown, a roof overhead walkway plate 18 and / or a buffer zone 21 are arranged next to the deformation joint 6, wherein the overhead walkway plate 18 is convenient for cleaning, maintenance, inspection and repair of roof facilities, and the buffer zone 21 has buffering, isolation, water filtering and drainage functions, which can effectively reduce the lateral pressure of the soil.

[0055] In summary, the present invention provides a complete and practical set of technical theories and methods to alleviate the NIMBY effect of sewage treatment plants, solve the "environmental friendliness" problem of urban sewage treatment plants and key technical problems in covering projects, thereby improving the overall level of related engineering construction.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heavy-loaded, large-span covered structure for an existing above-ground sewage treatment plant, characterized in that: The invention comprises piers (2), joists (3), vertical seismic isolation supports (11), steel beams (1) and concrete bridge decks (5) which are arranged in sequence from bottom to top, wherein the piers (2) are arranged vertically, the joists (3) are transversely fixedly arranged on a plurality of piers (2), and a plurality of the joists (3) are arranged side by side; the steel beams (1) and the joists (3) are arranged crosswise, and the steel beams (1) and the joists (3) are fixedly connected via the vertical seismic isolation supports (11); a plurality of the steel beams (1) are arranged side by side on the joists (3), and adjacent steel beams (1) are fixedly connected via a connecting system (10); the concrete bridge deck (5) is fixedly arranged on the top of the steel beams (1), and the concrete bridge deck (5) covers a plurality of tanks of a sewage treatment plant.

2. According to claim 1, a heavy-loaded large-span covered structure of an existing above-ground sewage treatment plant is characterized in that: The concrete bridge deck (5) comprises a plurality of prefabricated UHPC bridge decks and a plurality of prefabricated mid-span reinforced concrete slabs that are spliced ​​to each other, the prefabricated UHPC bridge decks being arranged corresponding to the structural support points at the top ends of the steel beams (1), and the prefabricated UHPC bridge decks and the prefabricated mid-span reinforced concrete slabs being connected to each other via wet joints.

3. According to claim 1, a heavy-loaded large-span covered structure of an existing above-ground sewage treatment plant is characterized in that: The steel beam (1) comprises a plurality of sections of I-section steel plate beams, wherein the plurality of sections of I-section steel plate beams are spliced ​​in sequence along the length direction of the steel beam (1).

4. According to claim 1, a heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant is characterized in that: At least two concrete bridge decks (5) are provided. The concrete bridge decks (5) are arranged obliquely, and the higher ends of two adjacent concrete bridge decks (5) are connected by a reinforced concrete slab beam (7).

5. According to claim 1, a heavy-loaded and large-span covered structure for an existing above-ground sewage treatment plant is characterized in that: The concrete bridge deck (5) is also provided with a drainage system, the drainage system comprising a planar waterproof layer (20) and a drainage pipe (12); the top surface of the concrete bridge deck (5) forms a plurality of slopes, the planar waterproof layer (20) is arranged obliquely along the slopes, and a water collection port (13) is provided at the lower end of each slope; the drainage pipe (12) passes through the concrete bridge deck (5) and is in communication with the water collection port (13).

6. The heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant according to claim 5 is characterized in that: The top surface of the concrete bridge deck (5) is provided with a covering layer (15) and a permeable layer (14); the top surface of the covering layer (15) forms a multi-section slope, and the planar waterproof layer (20) is arranged obliquely along the slope; the permeable layer (14) is arranged above the planar waterproof layer (20).

7. The heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant according to claim 6 is characterized in that: A filtering mechanism (1301) is provided between the water collection port (13) and the water permeable layer (14).

8. The heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant according to claim 1 is characterized in that: The concrete bridge deck (5) is provided with a deformation joint (6), the deformation joint (6) is parallel to the steel beam (1) and vertically penetrates the concrete bridge deck (5), and a first elastic filling member (19) is provided in the deformation joint (6); both side edges of the deformation joint (6) are raised upwards, and the raised parts on both sides of the deformation joint (6) are connected by a metal cover plate (16), and a retractable folding part (1601) is provided on the metal cover plate (16).

9. The heavy-loaded and large-span covered structure of an existing above-ground sewage treatment plant according to claim 8 is characterized in that: The concrete bridge deck (5) is also provided with a deformation joint waterproof layer (22), the deformation joint waterproof layer (22) comprising a first waterproof layer (2201), a second waterproof layer (2202) and a third waterproof layer (2203) which are arranged in sequence from the outside to the inside, the third waterproof layer (2203) being arranged at the bend of the raised portion of the deformation joint (6), the first waterproof layer (2201) and the second waterproof layer (2202) covering the third waterproof layer (2203) and the deformation joint (6), and the first waterproof layer (2201) and the second waterproof layer (2202) having a folded portion extending into the deformation joint (6), and a second elastic filling member (17) being arranged between the folded portion of the first waterproof layer (2201) and the folded portion of the second waterproof layer (2202).

10. A heavy-loaded and large-span covered structure for an existing above-ground sewage treatment plant according to claim 8 or 9, characterized in that: An overhead walkway plate (18) and / or a buffer zone (21) is provided adjacent to the deformation joint (6).

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