Energy-saving and environment-friendly compound inspection well cover device and construction method

Abstract

The invention relates to an energy-saving and environment-friendly compound inspection well cover device and a construction method. The energy-saving and environment-friendly compound inspection well cover device comprises a groove arc-shaped well ring with a screw rod, a rubber cushion plate, a compound well cover, a fastening device, a special tool and the like. The manhole cover is simple in structure, convenient and safe to mount and dismount, economical, energy-saving and environment-friendly in the whole life cycle, vertical and plane vibration and displacement between the manhole cover and the manhole ring and between the manhole ring and the manhole body can be eliminated, the same color and flexibility of the manhole cover and the asphalt pavement around the manhole ring are provided, vibration noise of an inspection well and impact damage to the structure of the inspection well are completely eradicated, and the service life of the inspection well is prolonged. The use time is greatly prolonged, so that a vehicle does not feel soft, rigid and soft vibration when passing through the inspection well cover, and a driver does not decelerate and unconsciously avoid when passing through the inspection well; the device ensures stability and theft prevention, the well lid is burst open when the water level of the well casing is high, safety of vehicles and pedestrians is endangered, operation of professionals is easy, the maintenance cost is low, urban road smoothness and the operation function are effectively guaranteed, and urban operation efficiency and effect are further improved and guaranteed.

Description

Technical Field

[0001] This invention relates to the fields of roads, municipal works, site leveling and pipelines in civil engineering construction, and in particular to an energy-saving and environmentally friendly double-layer manhole cover device and construction method. Background Technology

[0002] Manholes, also known as inspection wells, are important structural facilities in municipal engineering, particularly for roads, parking lots, and underground pipelines. They are essential components of urban road and parking lot construction. Manhole covers and frames for vehicular roads are primarily made of reinforced concrete, reinforced fiber concrete, ductile iron, and steel plates. The manhole base, body, and foundation are mostly made of concrete or reinforced concrete. These manholes are rigid components with high rigidity and strength. Rigid manholes, together with semi-rigid asphalt pavement, create a flexible-rigid-flexible roadway system. When wheels pass over the manhole cover, the impact on the manhole cover, manhole ring, and the semi-rigid pavement is caused by differences in the flexibility of the pavement and the lack of connection between the manhole cover and ring (either with anti-theft points or with reinforced concrete or reinforced fiber concrete covers and rings). This impact is particularly pronounced with manhole covers and rings that are either point-connected or unconnected, resulting in greater vibration and noise. The impact accelerates uneven settlement of the manhole and surrounding pavement, leading to pavement tearing, manhole damage, and increased stress on the manhole foundation, further accelerating manhole settlement and causing comprehensive damage to both the manhole and the pavement. Due to potential settlement differences between the manhole and the pavement, and the varying effects of flexible-rigid-flexible surfaces on vehicles, vehicles may experience bouncing and swaying, causing passenger discomfort. Vehicles may need to decelerate and accelerate, increasing fuel consumption and emissions, impacting road capacity and urban operational efficiency, and hindering energy conservation and urban environmental protection. In particular, the current roadway system, composed of rigid manhole covers and rings and semi-rigid asphalt pavement, presents problems due to the color and the varying properties of rigid and flexible pavement. Especially when there is a settlement difference between the manhole and the surrounding road surface, the technical condition of the road deteriorates rapidly. When drivers see the manhole, they will unconsciously slow down or drive around it, endangering the safety of other vehicles. This not only reduces the traffic capacity of urban roads but also increases the maintenance and management costs of the manhole and the surrounding roads, and shortens the lifespan of the manhole.

[0003] Manholes are important passageways connecting pipelines to the ground. They are crucial for ensuring the normal functioning of pipelines and for the operation, maintenance, inspection, repair, monitoring, and replacement of equipment and facilities within the pipelines. Furthermore, when connecting to the road surface, they must also function as surface structures. If the manhole cover and manhole ring are only point-connected or not connected at all, and the pavement has a flexible-rigid-flexible structure, the impact and live load from vehicles on the manhole cover and ring will increase exponentially, causing settlement and damage to the manhole structure. This leads to displacement, settlement, and various defects in the pavement within a certain range around the manhole structure, inevitably affecting the normal functioning of the pavement structure. Repair or reconstruction with enclosures is necessary, increasing the input of building materials, machinery, and labor. Construction noise, exhaust fumes, dust, material stockpiling, waste residue leakage, and cleaning also increase environmental protection and social energy consumption.

[0004] Eliminating point connections and no connections between manhole covers and manhole frames; ensuring flexible connections between manhole frames and manhole bodies; achieving rigid connections; and ensuring that manhole covers, manhole frames, and the surrounding asphalt pavement have the same color and flexibility can significantly reduce the impact, vibration, noise, and damage caused by vehicles to manholes and the surrounding pavement. This will extend the service life of manhole structures, prevent premature damage, reduce maintenance costs and carbon emissions, improve the function and throughput of urban roads, and enhance urban operational efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an energy-saving and environmentally friendly composite manhole cover device and construction method. This device transforms point connections and non-connections, as well as flexible connections, between the manhole cover and manhole ring, and between the manhole ring and manhole body into rigid connections. It ensures that the manhole cover, manhole ring, and surrounding asphalt pavement have the same color and flexibility. It eliminates vertical and planar vibrations and displacements between the manhole cover and manhole ring, and between the manhole ring and manhole body. The device features a simple structure, convenient and easy installation and disassembly, safety, theft prevention, economy throughout its lifespan, energy saving, environmental protection, stability, low maintenance costs, effective guarantee of urban road function, and effective suppression of early manhole damage, thereby improving and ensuring the efficiency of urban social operation.

[0006] The specific technical solution of the present invention is as follows: An energy-saving and environmentally friendly double-layer manhole cover device includes a grooved arc-shaped manhole ring with a screw, epoxy asphalt concrete, a rigid manhole cover, a fastening nut, a fastening device, a rubber pad, a drainage and cover removal hole, a circular fastening device protective cover, an epoxy asphalt adhesive layer, special tightening and loosening tools, and special tools for manhole cover removal and installation. The grooved arc-shaped manhole ring with screw includes a bolt hole, a screw, and a manhole ring wall that are connected to the top surface of the reinforced concrete manhole body; After the epoxy asphalt concrete is applied to the bottom and sides of the rigid manhole cover, it is completely and densely filled into the space of the rigid manhole cover excluding the protective cover of the circular fastening device. The rigid manhole cover includes a manhole cover wall, a fastening device protective cover, and a drainage hole; and a conical hole for fitting into a grooved arc-shaped manhole ring with a screw. A rubber pad is installed between the rigid manhole cover and the grooved arc-shaped manhole ring with screws, and is connected to the rigid manhole cover and epoxy asphalt concrete by fastening device and fastening nut; The special tightening and loosening tools include a hollow rotary head, a rotary head, and a flat rotary handle; the special tools for removing and installing manhole covers include a rotary handle and a threaded rod.

[0007] Furthermore, the grooved arc-shaped well ring with screws is divided into at least four bases, each base having two anchor holes for rigid connection with the anchor bolts pre-embedded on the top surface of the reinforced concrete manhole.

[0008] Furthermore, the upper inner side of the grooved arc-shaped manhole cover with screws has at least three screws evenly distributed, and the threads of the screws are blunted to prevent damage to the threads from repeated removal and installation of the manhole cover; the outer side is provided with a manhole cover protective wall, which is in seamless contact with the road surface structure around the manhole cover.

[0009] Furthermore, the bottom surface of the rigid manhole cover is flat, and the bottom surface inside the groove slopes from all sides towards the central drainage and cover removal hole. The drainage and cover removal hole is provided with threaded teeth, which are blunt-cut to prevent damage to the teeth when the manhole cover is pried off. A manhole cover protective wall is provided at the edge. Corresponding to the number of screws arranged on the upper inner side of the grooved arc-shaped manhole ring with screws, a circular fastening device protective ring is provided close to the manhole cover protective wall, dividing the circumference into equal parts. The overlapping part of the circular fastening device protective ring and the manhole cover protective wall is shared or separate. A conical hole is provided in the middle of the circular fastening device protective ring, which can be fitted with the screws arranged on the upper inner side of the grooved arc-shaped manhole ring with screws.

[0010] Furthermore, the fastening device includes a conical inner screw nut, a lower spring washer, an inner screw nut, a grooved washer pressure block, and an upper spring washer. The conical inner screw nut is screwed into the upper inner side of the grooved arc-shaped well ring with a screw rod by the hollow rotating head of a special tightening tool, thereby fixing the rigid well cover in a planar position. The lower spring washer and the inner screw nut are used for tightening and primary anti-theft. At the same time, the grooved washer pressure block and the upper spring washer are used to screw the fastening nut into the upper inner side of the grooved arc-shaped well ring with a screw rod by the rotating head of the special tightening tool, thereby fixing the rigid well cover in an elevation position and providing secondary anti-theft. A small vertical hole is provided on the inner edge of the fastening nut for drainage. The upper part of the fastening nut is the inner screw tightening device, and the lower part is the nut function device.

[0011] Furthermore, the top and vertical surfaces of the manhole ring wall, manhole cover wall, fastening device protective cover, and fastening nut are treated with arc angles using a secondary or cubic parabola; the internal screw nut is hexagonal or octagonal; the rubber pad material conforms to the current "Rubber Pads for Railway Concrete Sleepers" standard and can be made into a slope-type rubber pad according to the road surface slope at the installation location.

[0012] This invention also relates to a construction method for an energy-saving and environmentally friendly duplex manhole cover device, applicable to any of the devices described above, comprising the following steps: Step (1): Based on the installation location of the energy-saving and environmentally friendly double manhole cover device and the driving trajectory, plan and determine the vehicle wheels to pass through and crush the fastening device as little as possible, and determine the plane position of the anchor bolts pre-embedded on the top surface of the cement reinforced concrete manhole body. At the same time, determine the installation elevation of the top surface of the cement reinforced concrete manhole body according to the height of the grooved arc-shaped manhole ring with bolts and the road surface elevation. When pouring reinforced concrete manholes on site, calculate the elevation of the top surface of the manhole body. On the top surface of the installed manhole body reinforcement and formwork, accurately mark the anchor bolt connection positions for the bolt holes of the grooved arc-shaped manhole ring base with bolts. Install the anchor bolts and fix them to the reinforcement and formwork of the manhole body. During the pouring of the reinforced concrete manhole body, continuously observe and correct the accuracy of the plane and elevation position of each anchor bolt to ensure correct positioning, or reserve the anchor bolt holes for each anchor bolt. For prefabricated reinforced concrete components of manhole bodies, pre-reserve anchor bolt holes for each connecting plate, or form the anchor bolts and screws with the reinforced concrete components of the manhole body in one go according to the standard. Step (2): Check the position of the reserved anchor bolt hole. If any deviation is found, enlarge the hole or re-drill the hole. Clean the debris and dust in the hole. After wetting for more than 24 hours, wipe the hole dry. Insert each anchor bolt into the anchor bolt hole and fix it. Inject anchoring grout and correct the fixing position and elevation. Clean and sanitize all anchor bolts and screws embedded in the precast manhole body or the cast-in-place manhole body reinforced concrete. Step (3): Insert the bolt hole on the grooved arc-shaped well ring base with the screw into the anchor bolt on the top surface of the manhole body, install the spring washer, and tighten the nuts of each anchor bolt so that the base of the grooved arc-shaped well ring with the screw is firmly and rigidly connected to the top surface of the manhole body through the bolt hole. Step (4): Install rubber pads on the screw of the grooved arc-shaped well ring with screws that is rigidly connected to the top surface of the manhole body; Step (5): In the construction site processing workshop or factory, apply epoxy asphalt bonding layer to the bottom surface of the groove of the prepared manhole cover, the inner side of the manhole cover protective wall, and the outer side of the circular fastening device protective cover. Mix epoxy asphalt concrete mixture, weigh and mix the amount of epoxy asphalt concrete mixture according to the volume and density standards of the groove of the rigid manhole cover, fill it into the groove of the rigid manhole cover, and effectively compact it to ensure that it is flat and without bumps. When applying the epoxy asphalt bonding layer, to prevent the epoxy asphalt bonding layer material from contaminating the drainage cover hole, the drainage cover hole is sealed when filling the epoxy asphalt concrete mixture; when the epoxy asphalt concrete hardens and cools to room temperature, a hole is drilled at the location of the drainage cover hole so that the drainage cover hole penetrates through the epoxy asphalt concrete and the rigid manhole cover. Step (6): Transport the double manhole cover made in the on-site processing workshop or factory to the construction site and remove it. Use the threaded rod head of the manhole cover removal tool to screw into the drainage cover removal hole, remove the double manhole cover, and install the double manhole cover onto the screw of the grooved arc-shaped manhole ring with screw. Step (7): Screw the conical inner screw nuts into each screw of the grooved arc-shaped well ring with screws, and tighten each conical inner screw nut with the hollow rotating head of the special tightening tool to fix the rigid well cover in a plane. Then install the lower spring washer and screw in the inner screw nuts, and tighten each inner screw nut with the hollow rotating head of the special tightening tool. Step (8): Install grooved washer pressure blocks and upper spring washers on each screw of the grooved arc-shaped manhole ring with screws, screw in the fastening nuts, and screw the fastening nuts into each screw arranged on the upper inner side of the grooved arc-shaped manhole ring with screws using the turning head of the special tightening tool, and tighten them to ensure that the height of the fastening nuts meets the requirements of road surface flatness.

[0013] Furthermore, a construction method for overhauling an energy-saving and environmentally friendly double-layer manhole cover device includes the following steps: Step (1): Remove the mud and sand from the groove inside the fastening nut. Use the screw head of the special tightening tool to unscrew the fastening nut from the screws arranged on the upper inner side of the grooved arc-shaped well ring with screws. Remove the upper spring washer and the groove washer pressure block. Step (2): Use the screw head of the special tightening tool to unscrew the inner screw nut from each screw arranged on the upper inner side of the grooved arc-shaped well ring with screw, and remove the lower spring washer; Step (3): Use the screw head of the special tightening tool to unscrew the conical inner screw nut from the screws arranged on the upper inner side of the grooved arc-shaped well ring with screws; Step (4): Clean the threads in the drain cover removal hole with clean water, use the threaded rod of the manhole cover removal tool to screw into the drain cover removal hole, remove the duplex manhole cover, and expose the manhole opening; Step (5): Maintain and repair the pipeline and equipment inside the pipeline, and the manhole body through the wellhead, or replace the rubber pads; Step (6): After the repair or replacement is completed or when you are off work, use the threaded rod of the special tool for manhole cover removal to screw into the drainage cover removal hole, remove the duplex manhole cover, and install the duplex manhole cover onto the threaded rod of the grooved arc-shaped manhole ring with the threaded rod. Step (7): Repeat steps (7) and (8) of the aforementioned construction method to install the double manhole cover.

[0014] Further: A construction method for replacing an energy-saving and environmentally friendly duplex manhole cover device, characterized by the following steps: Step (1): According to the construction design drawings of the road reconstruction or the location of the replacement energy-saving and environmentally friendly duplex manhole cover device, calculate the center top elevation and longitudinal and transverse slope of each energy-saving and environmentally friendly duplex manhole cover device. At the same time, based on the current rigid manhole body top elevation, determine the rise and fall values ​​of the rigid manhole body top elevation and select the slope rubber pad. Step (2): According to the determined rise and fall values ​​of the top surface elevation of the rigid manhole body, raise or chisel away and level the top surface elevation of the rigid manhole body, and install the anchor bolts that are connected to the bolt holes of the grooved arc-shaped manhole ring base with bolts. Step (3): Repeat steps (3) to (8) of the aforementioned construction method to install the duplex manhole cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention relates to an energy-saving and environmentally friendly double-layer manhole cover device and its construction method. It consists of a double-layer manhole cover, a manhole ring, and specialized tools. The device restricts both planar and vertical displacement between the manhole cover and the manhole ring, maintaining an effective tight fit and connection. Simultaneously, it achieves a rigid connection between the manhole ring and the reinforced concrete top surface of the manhole body, limiting horizontal and vertical displacement and deformation, effectively transferring loads, and ensuring a seamless connection of the entire manhole structure. This avoids vibrations and noise caused by loose connections between manhole structures, reducing noise disturbance to urban residents. Furthermore, it reduces the impact of vibration on the manhole ring. The impact load on the manhole cover and manhole body, as well as the requirements for the bearing capacity of the foundation, improve the fatigue resistance and early failure resistance of the structure, further extending its service life and reducing maintenance costs, thus ensuring road traffic capacity and the social efficiency of urban operation. The device minimizes the contact area between rigid materials and vehicle wheels, increases the area of ​​epoxy asphalt concrete, and enhances the flexibility of the double-layered manhole cover by adding rubber pads. This ensures that the double-layered manhole cover has the same softness and color as the surrounding asphalt pavement, transforming the soft-rigid-soft road surface layer into a flexible one. This allows vehicles to pass over the manhole without noticeable discomfort or the need for avoidance, maintaining a smooth driving experience and consistent road surface color. Sloping rubber pads can also be used to adjust the manhole cover to match the slope of the road surface, effectively connecting it to the road surface.

[0016] Epoxy asphalt concrete, epoxy asphalt bonding layer, and rubber pads are manufactured and selected using existing mature technologies, which effectively controls costs.

[0017] This device features a triple anti-theft system consisting of a conical inner screw nut, an inner spiral nut, a fastening nut, and a drainage and cover removal hole. It also prevents the manhole cover from being breached by rising water levels, thus protecting pedestrians and vehicles. This invention considers both the feasibility and economic viability of the technology, facilitating its widespread use in the municipal sector. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 This is a planar schematic diagram of the present invention; Figure 3 This is a schematic diagram of the fastening device structure; Figure 4 This is a schematic diagram of the structure of a special tightening / loosening tool; Figure 5 This is a schematic diagram of the structure of a special tool for removing and installing manhole covers; Figure 6 This is a schematic diagram showing the right-angle curve treatment of the top surface of the protective wall and the fastening nut.

[0019] In the diagram: 1-grooved arc-shaped well ring with screw, 2-epoxy asphalt concrete, 3-rigid well cover, 4-fastening nut, 5-fastening device, 6-rubber pad, 7-bolt hole, 8-drainage and cover removal hole, 9-circular fastening device protective cover, 10-epoxy asphalt bonding layer, 11-special tightening and loosening tool, 12-special tool for removing and installing well cover; 011-screw, 012-well ring wall protector; 31-well cover wall protector, 32-drain hole; 51-conical internal screw nut, 52-lower spring washer, 53-internal screw nut, 54-grooved washer pressure block, 55-upper spring washer; 111-hollow rotary head, 112-rotary head, 113-slotted rotary handle, 121-rotary handle, 122-threaded rod head. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Unless otherwise defined, the technical or scientific terms used in the embodiments of this application shall have the ordinary meaning understood by one of ordinary skill in the art. The terms "first," "second," and similar terms used in this embodiment do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Installation," "connection," "linking," and "joining" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements. Terms such as "upper," "lower," "left," "right," "horizontal," and "vertical" are used only relative to the orientation of the components in the accompanying drawings. These directional terms are relative concepts used for relative description and clarification, and they may change accordingly depending on the orientation of the components in the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 , 2As shown in Figures 3, 4, 5, and 6, the energy-saving and environmentally friendly double-layer manhole cover device of this embodiment includes a grooved arc-shaped manhole ring 1 with a screw, a rigid manhole cover 3 that makes up the double-layer manhole cover, epoxy asphalt concrete 2, a rubber pad 6, a fastening nut 4, a fastening device 5, a drainage and cover removal hole 8, a circular fastening device protective cover 9, an epoxy asphalt bonding layer 10, a special tightening and loosening tool 11, and a special tool for removing and installing the manhole cover 12; the grooved arc-shaped manhole ring 1 with a screw, the rigid manhole cover 3, the fastening device 5, the circular fastening device protective cover 9, the special tightening and loosening tool 11, and the special tool for removing and installing the manhole cover 12 are made of steel.

[0024] The slotted arc-shaped manhole ring 1 with a screw includes a bolt hole 7 connected to the top surface of the reinforced concrete manhole body, a screw 011, and a manhole ring wall 012; epoxy asphalt concrete 2; after being coated with an epoxy asphalt bonding layer 10 on the bottom and sides of the rigid manhole cover 3, the epoxy asphalt concrete 2 completely fills the space of the rigid manhole cover 3 except for the circular fastening device protective cover 9; the rigid manhole cover 3 includes a manhole cover wall 31, a fastening device protective cover 9, and a drainage hole 32; the screw-equipped manhole ring 1 is fitted into the manhole cover. The grooved arc-shaped well ring 1 has a conical hole; the fastening device 5 includes a conical inner screw nut 51, a lower spring washer 52, an inner screw nut 53, a grooved washer pressure block 54, and an upper spring washer 55; the special tools include a special tightening / loosening tool 011 and a special tool for removing and installing well covers 012. The special tightening / loosening tool 011 includes a hollow rotating head 111, a rotating head 112, and a flat rotating handle 113; the special tool for removing and installing well covers 012 includes a rotating handle 121 and a threaded rod head 122.

[0025] The grooved arc-shaped manhole ring 1 with screws has at least four equally divided bases 013, with two anchor holes 7 at each point, which are rigidly connected to the anchor bolts pre-embedded on the top surface of the cement reinforced concrete manhole body; at least three screws 011 are equally divided on the upper part of the grooved arc-shaped manhole ring 1 with screws; a rubber pad 6 is installed and connected to the rigid manhole cover 3 and epoxy asphalt concrete 2 through fastening device 5 and fastening nut 4; The base 013 of the grooved arc-shaped manhole ring 1 with screws is square or rectangular. Each base 013 has two anchor holes 7 that are rigidly connected to the anchor bolts pre-embedded on the top surface of the reinforced concrete manhole body. At least three screws 011 are evenly distributed on the upper inner side of the grooved arc-shaped manhole ring 1 with screws. The threads of the screws 011 are blunt. A manhole ring protective wall 012 is provided on the outer side, which is in seamless contact with the road surface structure around the manhole ring. The bottom surface of the rigid manhole cover 3 is flat, and the bottom surface inside the groove slopes from all sides towards the center of the drainage and cover removal hole 8. The drainage and cover removal hole 8 is provided with threaded teeth, which are blunt-cut. The edge is provided with a manhole cover protective wall 31. Corresponding to the number of screws arranged on the upper inner side of the grooved arc-shaped manhole ring 1 with screws, a circular fastening device protective ring 9 is provided close to the manhole cover protective wall 31, dividing the circumference into equal parts. The circular fastening device protective ring 9 and the manhole cover protective wall 31 share the same part or are set separately. A conical opening is provided in the middle of the circular fastening device protective ring 9, which can fit the screws arranged on the upper inner side of the grooved arc-shaped manhole ring 1 with screws. The conical inner screw nut 51 of the fastening device 5 is screwed into the upper inner side of the grooved arc-shaped well ring 1 with screw rod by the hollow rotating head 111 of the special tightening tool 11 to fix the rigid well cover 3 in a plane; and the lower spring washer 52 and inner screw nut 53 are used for tightening and primary anti-theft; at the same time, the grooved washer pressure block 54 and the upper spring washer 55 are used to screw the fastening nut 4 into the upper inner side of the grooved arc-shaped well ring 1 with screw rod by the rotating head 112 of the special tightening tool 11 to fix the rigid well cover 3 in an elevation and secondary anti-theft; a vertical small hole is provided on the inner edge of the fastening nut 4 for drainage; the upper part of the fastening nut 4 is the inner screw tightening function device, and the lower part is the nut function device; This embodiment describes a construction method for a new energy-saving and environmentally friendly double-layer manhole cover device. The steps are as follows: Step (1): Based on the installation location of the energy-saving and environmentally friendly double manhole cover device and the driving trajectory, plan and determine the vehicle wheels to pass through and crush the fastening device as little as possible, and determine the plane position of the anchor bolts pre-embedded on the top surface of the cement reinforced concrete manhole body. At the same time, determine the installation elevation of the top surface of the cement reinforced concrete manhole body according to the height of the grooved arc manhole ring 1 with bolts and the road surface elevation. When pouring reinforced concrete manholes on site, calculate the elevation of the top surface of the manhole body. On the top surface of the installed manhole body reinforcement and formwork, accurately mark the anchor bolt connection positions of the bolt holes 7 of the slotted arc-shaped manhole ring 1 base 013 with bolts. Install the anchor bolts and fix them to the reinforcement and formwork of the manhole body. During the pouring of the reinforced concrete manhole body, observe and correct the accuracy of the plane and elevation position of each anchor bolt to ensure the correct position, or reserve the anchor bolt holes for each anchor bolt. For prefabricated reinforced concrete components of manhole bodies, pre-reserve anchor bolt holes for each connecting plate, or form the anchor bolts and screws with the reinforced concrete components of the manhole body in one go according to the standard. Step (2): Check the position of the reserved anchor bolt hole. If any deviation is found, enlarge the hole or re-drill the hole. Clean the debris and dust in the hole. After wetting for more than 24 hours, wipe the hole dry. Insert each anchor bolt into the anchor bolt hole and fix it. Inject anchoring grout and correct the fixing position and elevation. Clean and sanitize all anchor bolts and screws embedded in the precast manhole body or the cast-in-place manhole body reinforced concrete. Step (3): Insert the bolt hole 7 on the base 013 of the grooved arc-shaped well ring 1 with the bolt into the anchor bolt on the top surface of the manhole body, install the spring washer, and tighten the nuts of each anchor bolt so that the base 013 of the grooved arc-shaped well ring 1 with the bolt is firmly and rigidly connected to the top surface of the manhole body through the bolt hole 7. Step (4): Install rubber pad 6 on the screw 011 of the grooved arc-shaped well ring 1 with screw that is rigidly connected to the top surface of the manhole body; Step (5): In the construction site processing workshop or factory, apply epoxy asphalt bonding layer 10 to the bottom surface of the groove of the well cover, the inner side of the well cover wall 31, and the outer side of the circular fastening device protective cover 9. Mix epoxy asphalt concrete 2 according to the mix ratio. Weigh the amount of epoxy asphalt concrete 2 mixture according to the groove volume and density standards of the well cover, fill it into the groove of the well cover, and compact it effectively to ensure that it is flat and without bumps. The base asphalt for epoxy asphalt is Shell 70, accounting for 55% by mass; the epoxy resin is bisphenol A type E-51, accounting for 14% by mass; the curing agent is polydecanoic anhydride, accounting for 23% by mass; the curing accelerator is imidazole, accounting for 6.26% by mass; and other additives are sorbate, accounting for 1.74% by mass. The asphalt is heated to 145 degrees Celsius, and the epoxy resin, curing agent, and additives are added in proportion, and stirred for 30 minutes to obtain epoxy asphalt. Epoxy asphalt is used to coat epoxy asphalt bonding layer 10. The mixing ratio for epoxy asphalt AC-10 is 9.5mm~4.75mm basalt crushed stone from Shanxinpo, Jinning District, Kunming: 90:24:6 : 2.36mm~0mm limestone powder, with epoxy asphalt accounting for 5.8%. When the crushed stone and powder are mixed in proportion and heated to 150 degrees Celsius, epoxy asphalt is added in proportion to obtain epoxy asphalt mixture.

[0026] When applying the epoxy asphalt bonding layer 10, prevent the epoxy asphalt bonding layer material from contaminating the drainage cover hole 8; when filling the epoxy asphalt concrete 2 mixture, seal the drainage cover hole 8, fill the epoxy asphalt concrete 2 to a thickness of 3 cm, level and compact it, and when it hardens and cools to room temperature, drill a hole at the location of the drainage cover hole 8 so that the drainage cover hole 8 penetrates the epoxy asphalt concrete 2 and the rigid manhole cover 3. Step (6): Transport the double manhole cover made in the on-site processing workshop or factory to the construction site and remove it. Use the special tool 12 for manhole cover removal and installation to screw the threaded rod head 122 into the drainage and cover removal hole 8 to remove the double manhole cover. Install the double manhole cover onto the screw 011 of the grooved arc-shaped manhole ring 1 with screw. Step (7): Screw the conical inner screw nut 51 into each screw 011 of the grooved arc-shaped well ring 1 with screws, and tighten each conical inner screw nut 51 by using the hollow rotating head 111 of the special tightening tool 11 to fix the rigid well cover 3 in a plane. Then install the lower spring washer 52 and screw in the inner screw nut 53, and tighten each inner screw nut 53 by using the hollow rotating head 111 of the special tightening tool 11. Step (8): Install grooved washer pressure block 54 and upper spring washer 55 on each screw 011 of the grooved arc-shaped manhole ring 1 with screws, screw in fastening nut 4, and screw the fastening nut 4 into each screw 011 arranged on the upper inner side of the grooved arc-shaped manhole ring 1 with screws through the rotating head 112 of the special tightening tool 11, and tighten it to ensure that the height of the fastening nut 4 meets the requirements of road surface flatness.

[0027] Example 2: A construction method for overhauling an energy-saving and environmentally friendly double-layer manhole cover device, comprising the following steps: Step (1): Remove the mud and sand from the groove inside the fastening nut 4. Use the rotating head 112 of the special tightening tool 11 to unscrew the fastening nut 4 from each screw 011 arranged on the upper inner side of the groove arc-shaped well ring 1 with screws. Remove the upper spring washer 55 and the groove washer pressure block 54. Step (2): Use the screw head 111 of the special tightening tool 11 to unscrew the inner screw nut 53 from each screw 011 arranged on the upper inner side of the grooved arc-shaped well ring 1 with screw, and remove the lower spring washer 52. Step (3): Use the rotating head 111 of the special tightening tool 11 to unscrew the conical inner screw nut 51 from each screw 011 arranged on the upper inner side of the grooved arc-shaped well ring 1 with screws; Step (4): Clean the threads in the drain cover removal hole 8 with clean water, use the threaded rod head 122 of the well cover removal tool 12 to screw into the drain cover removal hole 8, remove the duplex well cover, and expose the well opening; Step (5): Maintain and repair the pipeline and equipment inside the pipeline and the manhole body through the wellhead, or replace the rubber pad 6; Step (6): After the repair or replacement is completed or when you are off work, use the special tool 12 for removing and installing manhole covers 12 threaded rod head 122 to screw into the drainage cover removal hole 8, remove the duplex manhole cover, and install the duplex manhole cover onto the screw 011 of the grooved arc-shaped manhole ring 1 with screw. Step (7): Repeat steps (7) and (8) of Example 1 to install the duplex manhole cover.

[0028] Example 3: A construction method for replacing an energy-saving and environmentally friendly double-layer manhole cover device, comprising the following steps: Step (1): According to the construction design drawings of the road reconstruction or the location of the replacement energy-saving and environmentally friendly duplex manhole cover device, calculate the center top surface elevation and longitudinal and transverse slope of each energy-saving and environmentally friendly duplex manhole cover device. At the same time, based on the current rigid manhole body top surface elevation, determine the rise and fall values ​​of the rigid manhole body top surface elevation and select the slope rubber pad 6. Step (2): According to the determined rise and fall values ​​of the top surface elevation of the rigid manhole body, raise or chisel and level the top surface elevation of the rigid manhole body, and install the anchor bolt screw connected to the bolt hole 7 of the grooved arc-shaped manhole ring 1 base 013 with screw. Step (3): Repeat steps (3) to (8) of Example 1 to install the duplex manhole cover.

[0029] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving and environmentally friendly double-layer manhole cover device, characterized in that: Includes a grooved arc-shaped well ring with a screw (1), epoxy asphalt concrete (2), rigid well cover (3), fastening nut (4), fastening device (5), rubber pad (6), drainage and cover removal hole (8), circular fastening device protective cover (9), epoxy asphalt bonding layer (10), special tightening and loosening tool (11), and special tool for removing and installing well cover (12). The grooved arc-shaped manhole ring (1) with screw includes a bolt hole (7) connected to the top surface of the cement reinforced concrete manhole body, a screw (011), and a manhole ring wall (012). After the epoxy asphalt concrete (2) is coated with epoxy asphalt bonding layer (10) on the bottom and sides of the rigid manhole cover (3), it is completely and densely filled in the space of the rigid manhole cover (3) except for the circular fastening device protective cover (9). The rigid manhole cover (3) includes a manhole cover wall (31), a fastening device protective cover (9), and a drainage hole (32); and a conical hole into which a grooved arc-shaped manhole ring (1) with a screw is fitted. A rubber pad (6) is installed between the rigid manhole cover (3) and the grooved arc-shaped manhole ring (1) with screws, and is connected to the rigid manhole cover (3) and epoxy asphalt concrete (2) through fastening device (5) and fastening nut (4); The special tightening and loosening tool (11) includes a hollow rotary head (111), a rotary head (112), and a flat rotary handle (113); the special tool for removing and installing manhole covers (12) includes a rotary handle (121) and a threaded rod head (122).

2. The energy-saving and environmentally friendly double-layer manhole cover device according to claim 1, characterized in that: The grooved arc-shaped well ring (1) with screws is divided into at least four bases (013), each base (013) having two anchor holes (7) that are rigidly connected to the anchor bolts pre-embedded on the top surface of the cement reinforced concrete manhole.

3. The energy-saving and environmentally friendly double-layer manhole cover device according to claim 1, characterized in that: The upper inner side of the grooved arc-shaped well ring (1) with screws has at least three screws (011) evenly arranged, and the threads of the screws (011) are blunted; the outer side is provided with a well ring protective wall (012) that is in seamless contact with the road surface structure around the well ring.

4. The energy-saving and environmentally friendly double-layer manhole cover device according to claim 1, characterized in that: The bottom surface of the rigid manhole cover (3) is flat, and the bottom surface of the groove is inclined from all sides to the center of the drainage and cover removal hole (8). The drainage and cover removal hole (8) is provided with threaded teeth, and the threads are blunt. The edge is provided with a manhole cover protective wall (31). Corresponding to the number of screws arranged on the upper inner side of the grooved arc-shaped manhole ring (1) with screws, a circular fastening device protective ring (9) is provided close to the manhole cover protective wall (31) and the circumference is equally divided. The overlapping part of the circular fastening device protective ring (9) and the manhole cover protective wall (31) is shared or set separately. A conical hole is provided in the middle of the circular fastening device protective ring (9) so that the screws arranged on the upper inner side of the grooved arc-shaped manhole ring (1) with screws can be fitted in.

5. The energy-saving and environmentally friendly double-layer manhole cover device according to claim 1, characterized in that: The fastening device (5) includes a conical inner screw nut (51), a lower spring washer (52), an inner screw nut (53), a grooved washer pressure block (54), and an upper spring washer (55). The conical inner screw nut (51) is screwed into the upper inner side of the grooved arc-shaped well ring (1) with a screw rod arranged by the hollow rotating head (111) of the special tightening tool (11) to fix the rigid well cover (3) in a plane; and the lower spring washer (52) and the inner screw nut (53) 53) Tighten and perform primary anti-theft; at the same time, use the grooved washer pressure block (54) and the upper spring washer (55) to screw the fastening nut (4) into the screw arranged on the upper inner side of the grooved arc-shaped well ring (1) with screw rod through the rotating head (112) of the special tightening tool (11) to perform elevation tightening and secondary anti-theft; a vertical small hole is set on the inner edge of the fastening nut (4) for drainage, the upper part of the fastening nut (4) is the internal tightening and loosening function device, and the lower part is the nut function device.

6. The energy-saving and environmentally friendly double-layer manhole cover device according to claim 1, characterized in that: The top and vertical surfaces of the well ring wall (012), well cover wall (31), fastening device protective cover (9) and fastening nut (4) are treated with arc angles by a second or third parabola; the rubber pad (6) is made into a slope rubber pad according to the road slope of the installation position.

7. A construction method for an energy-saving and environmentally friendly double-layer manhole cover device, characterized in that: The apparatus applicable to any one of claims 1-6 comprises the following steps: Step (1): Based on the installation location of the energy-saving and environmentally friendly duplex manhole cover device and the driving trajectory, plan and determine the vehicle wheels to pass through and crush the fastening device as little as possible, and determine the plane position of the anchor bolts pre-embedded on the top surface of the cement reinforced concrete manhole body. At the same time, determine the installation elevation of the top surface of the cement reinforced concrete manhole body according to the height of the grooved arc-shaped manhole ring (1) with bolts and the road surface elevation. When pouring reinforced concrete manholes on site, calculate the elevation of the top surface of the manhole body. On the top surface of the installed manhole body reinforcement and template, accurately mark the anchor bolt connection position of the bolt hole (7) of the base (013) of the grooved arc-shaped manhole ring (1) with bolts. Install the anchor bolts and fix them on the reinforcement and template of the manhole body. During the pouring of reinforced concrete manhole body, observe and correct the accuracy of the plane and elevation position of each anchor bolt to ensure the correct position, or reserve the anchor bolt hole for each anchor bolt. For prefabricated reinforced concrete components of manhole bodies, pre-reserve anchor bolt holes for each connecting plate, or form the anchor bolts and screws with the reinforced concrete components of the manhole body in one go according to the standard. Step (2): Check the position of the reserved anchor bolt hole. If any deviation is found, enlarge the hole or re-drill the hole. Clean the debris and dust in the hole. After wetting for more than 24 hours, wipe the hole dry. Insert each anchor bolt into the anchor bolt hole and fix it. Inject anchoring grout and correct the fixing position and elevation. Clean and sanitize all anchor bolts and screws embedded in the precast manhole body or the cast-in-place manhole body reinforced concrete. Step (3): Insert the bolt hole (7) on the base (013) of the grooved arc-shaped well ring (1) with screw into the anchor bolt on the top surface of the manhole body, install the spring washer, and tighten the nuts of each anchor bolt so that the base (013) of the grooved arc-shaped well ring (1) with screw is firmly and rigidly connected to the top surface of the manhole body through the bolt hole (7); Step (4): Install rubber pads (6) on the screw (011) of the grooved arc-shaped well ring (1) with screws that are rigidly connected to the top surface of the manhole body. Step (5): In the construction site processing workshop or factory, apply epoxy asphalt bonding layer (10) to the bottom surface of the groove of the prepared manhole cover (3), the inner side of the manhole cover protective wall (31), and the outer side of the circular fastening device protective cover (9). Mix epoxy asphalt concrete (2) mixture, weigh the amount of epoxy asphalt concrete (2) mixture according to the volume and density standard of the groove of the rigid manhole cover (3), fill it into the groove of the rigid manhole cover (3), and effectively compact it to ensure that it is flat and without bumps. When applying the epoxy asphalt bonding layer (10), in order to prevent the epoxy asphalt bonding layer material from contaminating the drainage cover hole (8), the drainage cover hole (8) is sealed when filling the epoxy asphalt concrete (2) mixture; when the epoxy asphalt concrete (2) hardens and cools to room temperature, a hole is drilled at the location of the drainage cover hole (8) so that the drainage cover hole (8) penetrates through the epoxy asphalt concrete (2) and the rigid manhole cover (3); Step (6): Transport the double manhole cover made in the construction site processing workshop or factory to the construction site and unload it. Use the special tool for manhole cover removal (12) threaded rod head (122) to screw into the drainage removal hole (8) to remove the double manhole cover. Install the double manhole cover onto the screw (011) of the grooved arc-shaped manhole ring (1) with screw. Step (7): Screw the conical inner screw nut (51) into each screw (011) of the grooved arc-shaped well ring (1) with screws, and tighten each conical inner screw nut (51) with the hollow rotating head (111) of the special tightening tool (11) to fix the rigid well cover (3) in a plane. Then install the lower spring washer (52) and screw in the inner screw nut (53). Tighten each inner screw nut (53) with the hollow rotating head (111) of the special tightening tool (11). Step (8): Install grooved washer pressure block (54) and upper spring washer (55) on each screw (011) of the grooved arc-shaped manhole ring (1) with screws, screw in the fastening nut (4), and screw the fastening nut (4) into each screw (011) arranged on the upper inner side of the grooved arc-shaped manhole ring (1) with screws by rotating the head (112) of the special tightening tool (11), and tighten it to ensure that the height of the fastening nut (4) meets the requirements of road surface flatness.

8. The construction method of the energy-saving and environmentally friendly duplex manhole cover device according to claim 7, characterized in that: Includes the following steps: Step (1): Remove the mud and sand from the groove inside the fastening nut (4), and use the rotating head (112) of the special tightening tool (11) to unscrew the fastening nut (4) from each screw (11) arranged on the upper inner side of the groove arc-shaped well ring (1) with screws, and remove the upper spring washer (55) and the groove washer pressure block (54). Step (2): Use the rotating head (111) of the special tightening tool (11) to unscrew the inner screw nut (53) from each screw (11) arranged on the upper inner side of the grooved arc-shaped well ring (1) with screw, and remove the lower spring washer (52). Step (3): Use the rotating head (111) of the special tightening tool (11) to unscrew the conical inner screw nut (51) from each screw (11) arranged on the upper inner side of the grooved arc-shaped well ring (1) with screws; Step (4): Clean the threads in the drain cover removal hole (8) with clean water, use the threaded rod head (122) of the well cover removal tool (12) to screw into the drain cover removal hole (8), remove the duplex well cover, and expose the well opening; Step (5): Maintain and repair the pipeline and equipment inside the pipeline and the manhole body through the wellhead, or replace the rubber pads (6). Step (6): After the repair or replacement is completed or when you are off work, use the special tool (12) for manhole cover removal and installation (122) to screw the threaded rod head (122) into the drainage cover removal hole (8), remove the duplex manhole cover, and install the duplex manhole cover onto the screw (011) of the grooved arc-shaped manhole ring (1) with screw. Step (7): Repeat steps (7) and (8) in claim 7 to install the double manhole cover.

9. The construction method of an energy-saving and environmentally friendly duplex manhole cover device according to claim 7, characterized in that: Includes the following steps: Step (1): According to the construction design drawings of the road reconstruction or the location of the replacement energy-saving and environmentally friendly duplex manhole cover device, calculate the center top surface elevation and longitudinal and transverse slope of each energy-saving and environmentally friendly duplex manhole cover device. At the same time, based on the current rigid manhole body top surface elevation, determine the rise and fall values ​​of the rigid manhole body top surface elevation and select the slope rubber pad (6). Step (2): According to the determined rise and fall values ​​of the top surface elevation of the rigid manhole body, raise or chisel and level the top surface elevation of the rigid manhole body, and install the anchor bolt screw connected to the bolt hole (7) of the base (013) of the grooved arc-shaped manhole ring (1) with screw; Step (3): Repeat steps (3) to (8) of claim 7 to install the duplex manhole cover.

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