Well lid and manufacturing method thereof

Abstract

The invention discloses a well lid and a manufacturing method thereof, and relates to the technical field of well lids, the well lid comprises a well seat and a cover plate main body, the well seat is provided with a well mouth groove matched with the cover plate main body, and the cover plate main body can be placed in the well mouth groove; wherein a damping device is arranged at the bottom of the cover plate main body, so that the cover plate main body is supported on the wellhead groove through the damping device; the cover plate body comprises a concrete cover plate, a steel hoop and FRP cloth, the steel hoop surrounds the concrete cover plate, the concrete cover plate comprises a supporting structure layer and an anti-impact layer arranged on the supporting structure layer, a reinforcing mesh used for enhancing the structural strength is arranged in the supporting structure layer, a fiber mesh is arranged in the anti-impact layer, and the fiber mesh is arranged on the supporting structure layer. The fiber net extends to the reinforcing mesh; the reinforcing mesh is connected with the steel hoop, and the FRP cloth is adhered to the outer side surface of the steel hoop. By the adoption of the method, the structural integrity is high, and impact resistance and corrosion resistance are high.

Description

Technical Field

[0001] The present invention relates to the technical field of manhole covers, and in particular to a manhole cover and a manufacturing method thereof. Background Art

[0002] With the rapid economic growth, the urban development map has expanded rapidly. There are a large number of inspection manhole covers in the fields of road engineering, tunnel engineering, municipal engineering, etc. The common types of manhole covers in engineering mainly include cast iron manhole covers, reinforced concrete manhole covers, composite manhole covers and steel fiber concrete manhole covers. Although traditional manhole covers are widely used in engineering, they still face various safety and durability problems. Traditional cast iron manhole covers are mainly faced with the problems of easy rust damage and easy theft and loss. Traditional concrete manhole covers will have brittle cracking, damage, and poor durability. Traditional composite manhole covers are not suitable for structural parts with bearing capacity requirements. Traditional steel fiber concrete manhole covers are usually equipped with outer ring steel hoops to enhance bearing capacity, but the outer ring steel hoops are prone to rust and failure. The above problems will increase the cost of manhole covers and increase the personal safety risks of inspection personnel and citizens. In addition, there are a large number of municipal inspection manhole covers and they are scattered. It is difficult for maintenance personnel to regularly grasp the damage and loss of each inspection manhole cover. A lot of inspections and observation records are required, and it is difficult for maintenance personnel to accurately repair and replace the manhole covers. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a manhole cover with high structural strength, strong impact resistance and corrosion resistance.

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a method for manufacturing a manhole cover with high structural integrity and strong impact resistance and corrosion resistance.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a manhole cover, comprising a manhole seat and a cover plate body, wherein the manhole seat is provided with a manhole opening groove adapted to the cover plate body for the cover plate body to be placed therein;

[0006] Wherein, a shock absorbing device is provided at the bottom of the cover plate body so as to be supported on the wellhead groove through the shock absorbing device;

[0007] The cover plate body includes a concrete cover plate, a steel hoop and an FRP cloth. The steel hoop encloses the concrete cover plate. The concrete cover plate includes a supporting structure layer and an impact-resistant layer arranged on the supporting structure layer. A steel mesh for enhancing structural strength is arranged in the supporting structure layer. A fiber mesh is arranged in the impact-resistant layer. The fiber mesh extends to the steel mesh. The steel mesh is connected to the steel hoop, and the FRP cloth is adhered to the outer surface of the steel hoop.

[0008] As an improvement of the above solution, the shock absorbing device comprises an upper structural plate, a lower structural plate and a buffer assembly, wherein the buffer assembly is sandwiched between the upper structural plate and the lower structural plate, and the upper structural plate is connected to the cover plate body;

[0009] The buffer assembly comprises a spring and a rubber block, and at least one spring is arranged between two adjacent rubber blocks.

[0010] As an improvement to the above solution, a label for recording information is provided on the surface of the concrete cover plate;

[0011] The label includes a graphic mark for directly displaying information and a two-dimensional code graphic for recording electronic information;

[0012] A monitoring device is arranged at the bottom center of the concrete cover plate, and the monitoring device comprises an inclination sensor, a vibration sensor, a temperature and humidity sensor, a water level sensor and a communication device for sending and receiving sensor information.

[0013] As an improvement of the above solution, the well seat is provided with a lock buckle for limiting the cover plate body from being separated from the wellhead groove, and the cover plate body is provided with a lock ring corresponding to the lock buckle. After the cover plate body is placed in the wellhead groove, the cover plate body is rotated so that the lock ring is buckled into the lock buckle;

[0014] The steel mesh is conductively connected to a conductive mounting post for mounting the detection device, and the locking ring is conductively connected to the steel mesh. The detection device also includes a potential sensing element for monitoring the potential change of the locking ring, so that after the locking ring is buckled into the locking buckle, the potential sensing element is grounded in sequence through the conductive mounting post, the steel mesh, the locking ring and the locking buckle to generate a potential change.

[0015] As an improvement of the above solution, the cross-section of the steel hoop is U-shaped to cover the side wall, top surface and bottom surface of the concrete cover plate;

[0016] The concrete cover plate and the well seat are both cast and formed by UHPC material, and have a steel fiber content of 1% to 2%. The fiber mesh is made of polypropylene fiber, and a plurality of fiber strips extend from the bottom of the fiber mesh and are connected to the steel mesh; the FRP cloth is aramid fiber cloth, glass fiber cloth or carbon fiber cloth.

[0017] A method for manufacturing a manhole cover, wherein the steel mesh comprises longitudinal steel bars and transverse steel bars, and the composite hoop comprises a steel hoop and an FRP cloth;

[0018] First, the longitudinal steel bars are fixed on the inner surface of the composite hoop by welding, and then the transverse steel bars are fixed on the longitudinal steel bars by welding or tying, so that the steel hoop and the steel mesh form an integrated structure, and then the fiber mesh is laid on the steel mesh, and the fiber mesh laid on the steel mesh is pierced by a piercing tool, so that the fiber mesh and the steel mesh are cross-linked;

[0019] Use high-strength epoxy resin glue to stick multiple layers of FRP cloth to the outside of the steel hoop and leave it for 7 to 10 days until the FRP cloth and the steel hoop are firmly attached to form a cover plate skeleton;

[0020] Prepare the bottom mold and top mold of the cover plate body and the well seat, put the cover plate frame and the well seat into the corresponding bottom molds, and then cover them with the corresponding top molds and pour concrete. During the pouring process, steam curing is performed. After the concrete solidifies to a preset strength, the top mold and the bottom mold are removed in turn to obtain the cover plate body and the well seat;

[0021] The shock absorbing devices are evenly installed at the bottom edge of the cover plate body.

[0022] As an improvement of the above-mentioned scheme, a preset number of bolts and locking rings are welded at preset positions of the steel mesh, and the bottom mold of the cover plate frame is provided with reserved holes adapted to the bolts and locking rings, respectively. The relative positions of the bottom mold of the cover plate frame and the cover plate frame are adjusted so that the bolts and locking rings respectively leak out from the corresponding reserved holes.

[0023] As an improvement of the above solution, a lock buckle is installed on the well seat to limit the cover plate body from being separated from the wellhead groove;

[0024] The well seat is provided with a lock for limiting the cover plate body from being separated from the wellhead groove, and the lock is in a T-shaped structure so that the cover plate body can be inserted into the lock in both forward and reverse rotations.

[0025] As an improvement of the above solution, the bottom mold of the cover body is a plastic bottom mold, and the top mold of the cover body is a steel top mold, and the steel top mold is engraved with patterns for casting and forming the label.

[0026] As an improvement of the above solution, before pouring the cover plate body, the steel top mold of the cover plate body is provided with a counterweight block to prevent the steel hoop from floating up during the pouring process.

[0027] The implementation of the present invention has the following beneficial effects:

[0028] The embodiment of the present invention discloses a manhole cover, comprising a manhole seat and a cover plate body, wherein the manhole seat is provided with a manhole opening groove adapted to the cover plate body for the cover plate body to be placed therein, thereby preventing the side edge of the cover plate body from leaking out and being hit;

[0029] Wherein, a shock absorbing device is provided at the bottom of the cover plate body, so as to support it on the wellhead groove through the shock absorbing device, thereby avoiding direct hard contact between the rigid components of the cover plate body and the well seat, thereby reducing damage to the bottom of the cover plate body.

[0030] The cover plate body comprises a concrete cover plate, a steel hoop and an FRP cloth, wherein the steel hoop encloses the concrete cover plate, the concrete cover plate comprises a supporting structure layer and an impact-resistant layer arranged on the supporting structure layer, a steel mesh for enhancing structural strength is arranged in the supporting structure layer, a fiber mesh is arranged in the impact-resistant layer, and the fiber mesh extends to the steel mesh; the steel mesh is connected to the steel hoop;

[0031] The setting of the steel hoop can circumferentially constrain the interior of the concrete cover plate, thereby improving the bearing capacity. At the same time, the connection between the steel mesh and the steel hoop can make the structural integrity of the cover plate body strong and further improve the bearing performance of the steel mesh. Moreover, based on the setting of the fiber mesh, the toughness of the surface of the cover plate body can be greatly improved, so as to better resist the impact of the outside world such as wheels and is not prone to cracking. The FRP cloth pasted on the outer surface of the steel hoop can greatly prevent the steel hoop from corrosion.

[0032] Correspondingly, the present invention also discloses a method for manufacturing the above-mentioned manhole cover, and the manhole cover manufactured by this method has high structural integrity and strong impact resistance and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the manhole cover of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the well seat of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the concrete cover plate of the present invention;

[0036] Figure 4 It is a schematic structural diagram of a cover plate frame without a fiber mesh according to the present invention;

[0037] Figure 5 It is a schematic structural diagram of the shock absorbing device of the present invention;

[0038] Figure 6 Schematic diagram of the top structure of the cover plate body of the present invention;

[0039] Figure 7 Schematic diagram of the bottom structure of the cover plate body of the present invention;

[0040] Figure 8 It is a structural schematic diagram of a cover plate body provided with external structural ribs according to the present invention. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] See also Figure 1 , 2 , 3 and 4, an embodiment of the present invention provides a manhole cover, including a manhole seat 1 and a cover body 2, the manhole seat 1 is provided with a manhole groove 11 adapted to the cover body 2 for the cover body 2 to be placed; wherein, a shock absorbing device 3 is provided at the bottom of the cover body 2 to be supported on the manhole groove 11 through the shock absorbing device 3; the cover body 2 includes a concrete cover 21, a steel hoop 22 and an FRP cloth 23, the steel hoop 22 encloses the concrete cover 21, the concrete cover 21 includes a supporting structure layer 21a and an impact-resistant layer 21b arranged on the supporting structure layer 21a, a steel mesh 24 for enhancing structural strength is provided in the supporting structure layer 21a, a fiber mesh 6 is provided in the impact-resistant layer 21b, and the fiber mesh 6 extends to the steel mesh 24; the steel mesh 24 is connected to the steel hoop 22, and the FRP cloth 23 is adhered to the outer surface of the steel hoop 22; the surface of the concrete cover 21 is provided with a label for recording information.

[0043] Specifically, see Figure 5 The shock absorbing device 3 comprises an upper structural plate 31, a lower structural plate 32 and a buffer assembly, wherein the buffer assembly is sandwiched between the upper structural plate 31 and the lower structural plate 32, and the upper structural plate 31 is connected to the cover plate body 2;

[0044] The upper structural plate 31 and the lower structural plate 32 are preferably metal plates with high structural strength, such as steel plates. The upper structural plate 31 and the steel hoop 22 are both provided with corresponding connecting holes to facilitate detachable connection and fixing by bolts, screws, etc.

[0045] In order to prevent the buffering device from being too hard or too soft, the buffer assembly includes a spring 33 and a rubber block 34, and at least one spring 33 is provided between two adjacent rubber blocks 34. The combination of the spring 33 and the rubber block 34, which are made of two materials with different buffering effects, can make the buffering effect soft first and hard later, thereby preventing the cover body 2 from sinking excessively when under pressure. Preferably, the shock absorbing device 3 is provided in plurality, and the spacing is evenly distributed at the bottom of the steel hoop.

[0046] Furthermore, in order to reduce the falling impact damage of the cover plate body 2 during the process of being placed in the wellhead groove 11 and the collision noise between the cover plate body 2 and the well seat 1, a buffer pad 35 for contacting the well seat 1 is provided at the bottom of the lower structure plate 32. The buffer pad 35 is a rubber pad. This arrangement greatly reduces the noise generated by the vehicle contacting the well cover when driving.

[0047] See also Figure 6 The label includes a graphic mark 211 for directly displaying information and a two-dimensional code graphic 212 for recording electronic information; the graphic mark 211 can be a text, such as the word "rain", which can represent a rain well. The two-dimensional code graphic 212 can be used to record the number and production information of the manhole cover.

[0048] A monitoring device 4 is provided at the bottom center of the concrete cover slab 21 . The monitoring device 4 includes an inclination sensor, a vibration sensor, a temperature and humidity sensor, a water level sensor, and a communication device for sending and receiving sensor information.

[0049] The communication device, tilt sensor, vibration sensor, temperature and humidity sensor and water level sensor are prior arts, and their structural principles are not described one by one here.

[0050] See also Figure 7 In order to prevent the cover body 2 from accidentally detaching from the well seat 1, the well seat 1 is provided with a lock 12 that limits the cover body 2 from detaching from the wellhead groove 11, and the cover body 2 is provided with a lock ring 25 corresponding to the lock 12. After the cover body 2 is placed in the wellhead groove 11, the cover body 2 is rotated so that the lock ring 25 is buckled into the lock 12. Preferably, the lock 12 is a T-shaped structure, so that the cover body 2 can be inserted into the lock 12 in both forward and reverse rotations, thereby completing the locking connection. Such a configuration can effectively prevent the backflow of the manhole cover after heavy rain, and better ensure the comfort and personal safety of citizens. Preferably, the lock ring 25 is welded to the steel mesh 24.

[0051] The cross section of the steel hoop 22 is U-shaped to cover the side wall, top surface and bottom surface of the concrete cover slab 21 to improve the crack resistance of the edge of the concrete cover slab 21 .

[0052] Furthermore, in order to conveniently monitor whether the cover plate body 2 is locked with the well seat 1 and the number of times the cover plate body 2 is pressed, it is possible to effectively avoid accidental safety problems caused by the long-term lack of the well cover. And according to the number of times it is pressed, it is actively reminded that the corresponding cover plate body 2 needs to be judged on-site for loss, so that the corresponding well cover can be repaired in a targeted manner to reduce the workload of daily maintenance.

[0053] The steel mesh 24 is conductively connected to a conductive mounting post for installing the detection device, and the lock ring 25 is conductively connected to the steel mesh 24. The detection device also includes a potential sensing element for monitoring the potential change of the lock ring 25, so that after the lock ring 25 is buckled into the lock buckle 12, the potential sensing element is grounded through the conductive mounting post, the steel mesh 24, the lock ring 25 and the lock buckle 12 in sequence to generate a potential change. The potential sensing element is a prior art, and its structural principle is not described one by one here. Preferably, the conductive mounting post is a bolt 26 welded to the steel mesh 24, and extends below the bottom surface of the cover plate body 2, so that the detection device can be installed and fixed by the bolt 26, and its internal components can also be conductively connected to the lock ring 25 through the bolt 26. Accordingly, the lock buckle 12 and the lock ring 25 are made of conductive metal material.

[0054] Compared with the vibration detection of the vibration sensor, based on the setting of the shock absorbing device 3, the lock ring 25 and the lock buckle 12 are in a close conductive connection state. When the cover body 2 is under heavy pressure, the lock ring 25 and the lock buckle 12 are vertically separated, which causes the potential sensing element to produce a potential change. Therefore, the maintenance cycle of the manhole cover can be more accurately determined by combining the number of times the potential sensing element is pressed. For the cover body 2 that is less pressed, the maintenance cycle can be appropriately extended.

[0055] The concrete cover 21 and the manhole seat 1 are both cast from UHPC materials, and have a steel fiber content of 1% to 2% to ensure the overall foundation strength of the concrete cover 21; the FRP cloth 23 is aramid fiber cloth, glass fiber cloth or carbon fiber cloth. Since UHPC does not contain coarse aggregate and has a smooth surface, it is more beautiful than traditional concrete manhole covers and can be customized with more complex surface patterns and text, such as Chinese characters and QR code patterns. The fiber mesh 6 is made of polypropylene fibers, and a plurality of fiber strips 61 extend from the bottom of the fiber mesh 6 and are interlaced with the steel mesh 24;

[0056] In order to improve the anti-slip property of the surface of the concrete cover 21, the surface of the concrete cover 21 is provided with anti-slip structural stripes 29, and the structural stripes can be grid stripes. More preferably, the structural stripes include a plurality of convex stripes with a plurality of horizontal parallel arrangements and a plurality of convex stripes with a plurality of vertical parallel arrangements.

[0057] In order to facilitate operators to lift and rotate the concrete cover plate, the concrete cover plate is provided with an opening hole 27 for an external workpiece to be hooked into the opening hole 27 .

[0058] On the other hand, see Figure 8The bottom of the concrete cover plate 21 is provided with external structural ribs 28 for enhancing the bearing capacity. The external structural ribs 28 are arranged in a crisscross pattern. Therefore, while ensuring the bearing requirements of the cover plate body 2, the thickness of the concrete cover plate 21 can be reduced by arranging the external structural ribs 28, thereby reducing the production cost of the concrete cover plate 21. At the same time, the weight of the concrete cover plate 21 is reduced, and the difficulty of subsequent maintenance operations is also reduced.

[0059] The present invention also discloses a method for manufacturing a manhole cover, and the method is as follows:

[0060] 1. The steel mesh 24 includes longitudinal steel bars 241 and transverse steel bars 242, and the composite hoop includes a steel hoop 22 and an FRP cloth 23; the longitudinal steel bars 241 are first fixed to the inner surface of the composite hoop by welding, and then the transverse steel bars 242 are fixed to the longitudinal steel bars 241 by welding or binding, so that the steel hoop 22 and the steel mesh 24 form an integrated structure;

[0061] Then, the fiber mesh 6 is laid on the steel mesh 24, and the fiber mesh 6 laid on the steel mesh 24 is pierced by a piercing tool to make a cross-linked connection between the fiber mesh 6 and the steel mesh 24;

[0062] 2. Use high-strength epoxy resin glue to stick the multi-layer FRP cloth 23 to the outside of the steel hoop 22, and leave it for 7 to 10 days until the FRP cloth 23 and the steel hoop 22 are firmly attached to form a cover plate skeleton;

[0063] 3. Prepare the bottom mold and top mold of the cover plate body 2 and the well seat 1, place the cover plate frame and the well seat 1 into the corresponding bottom molds respectively, and then cover them with the corresponding top molds respectively and pour concrete, and perform steam curing during the pouring process to promote the hydration reaction of cement in the concrete, thereby improving the early strength and durability of the concrete; wherein, during the pouring process of the cover plate body 2, the fiber mesh 6 is relatively located below the steel mesh 24 to prevent the fiber mesh 6 from floating up during the pouring process and affecting the complete pouring of the concrete.

[0064] 4. After the concrete solidifies to a preset strength, the top form and the bottom form are removed in sequence to obtain the cover plate body 2 and the well seat 1;

[0065] 5. The shock absorbing devices 3 are evenly installed at the bottom edge of the cover body 2 .

[0066] Among them, in order to enable the cover body 2 to obtain bolts 26 and locking rings 25 with high-strength connectivity, a preset number of bolts 26 and locking rings 25 are welded at preset positions of the steel mesh 24, and the bottom mold of the cover frame is respectively provided with reserved holes compatible with the bolts and locking rings 25. The relative positions of the bottom mold of the cover frame and the cover frame are adjusted so that the bolts and locking rings 25 are respectively leaked out from the corresponding reserved holes, so that after the cover body 2 is cast, the bolts and locking rings 25 not only generate bonding force with the concrete, but also form a strong welding force with the steel mesh 24, so as to greatly improve the pull-out resistance of the bolts 26 and the locking rings 25.

[0067] Accordingly, a lock buckle 5 is installed on the well seat 1 to limit the cover plate body 2 from being separated from the wellhead groove 11;

[0068] The well seat 1 is provided with a lock 5 for limiting the cover body 2 from being separated from the wellhead groove 11. The lock 5 is in a T-shaped structure so that the cover body 2 can be inserted into the lock 5 for both forward and reverse rotation, thereby realizing the assembly and opening of the well cover.

[0069] In order to combine the manufacturing cost and manufacturing precision of the manhole cover, the bottom mold of the cover body 2 is a plastic bottom mold, and the top mold of the cover body 2 is a steel top mold. The steel top mold is engraved with patterns for casting and forming the label. Due to the complex bottom components of the cover body 2, its bottom mold is prone to demoulding difficulties or demoulding damage. Therefore, the good elastic deformation performance of the plastic bottom mold itself can be used to more easily implement the demoulding process, and its replacement cost is low. The top mold is a steel top mold, so that a more delicate pattern can be obtained during casting.

[0070] On the other hand, in order to prevent the steel hoop 22 from floating up during the pouring process, before the pouring of the cover plate body 2, a counterweight block is provided on the steel top mold of the cover plate body 2.

[0071] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A manhole cover, characterized in that: It comprises a well seat and a cover plate body, wherein the well seat is provided with a wellhead groove matched with the cover plate body for the cover plate body to be placed therein; Wherein, a shock absorbing device is provided at the bottom of the cover plate body so as to be supported on the wellhead groove through the shock absorbing device; The cover plate body includes a concrete cover plate, a steel hoop and an FRP cloth. The steel hoop encloses the concrete cover plate. The concrete cover plate includes a supporting structure layer and an impact-resistant layer arranged on the supporting structure layer. A steel mesh for enhancing structural strength is arranged in the supporting structure layer. A fiber mesh is arranged in the impact-resistant layer. The fiber mesh extends to the steel mesh. The steel mesh is connected to the steel hoop, and the FRP cloth is adhered to the outer surface of the steel hoop.

2. The manhole cover according to claim 1, characterized in that: The shock absorbing device comprises an upper structural plate, a lower structural plate and a buffer assembly, wherein the buffer assembly is sandwiched between the upper structural plate and the lower structural plate, and the upper structural plate is connected to the cover plate body; The buffer assembly comprises a spring and a rubber block, and at least one spring is arranged between two adjacent rubber blocks.

3. The manhole cover according to claim 2, characterized in that: The surface of the concrete cover slab is provided with a label for recording information; The label includes a graphic mark for directly displaying information and a two-dimensional code graphic for recording electronic information; A monitoring device is arranged at the bottom center of the concrete cover plate, and the monitoring device comprises an inclination sensor, a vibration sensor, a temperature and humidity sensor, a water level sensor and a communication device for sending and receiving sensor information.

4. The manhole cover according to claim 3, characterized in that: The well seat is provided with a lock catch for limiting the cover plate body from being separated from the wellhead groove, and the cover plate body is provided with a lock ring corresponding to the lock catch. After the cover plate body is placed in the wellhead groove, the cover plate body is rotated so that the lock ring is buckled into the lock catch; The steel mesh is conductively connected to a conductive mounting post for mounting the detection device, and the locking ring is conductively connected to the steel mesh. The detection device also includes a potential sensing element for monitoring the potential change of the locking ring, so that after the locking ring is buckled into the locking buckle, the potential sensing element is grounded in sequence through the conductive mounting post, the steel mesh, the locking ring and the locking buckle to generate a potential change.

5. The manhole cover according to claim 4, characterized in that: The cross section of the steel hoop is U-shaped so as to cover the side wall, top surface and bottom surface of the concrete cover plate; The concrete cover plate and the well seat are both cast and formed by UHPC material, and have a steel fiber content of 1% to 2%. The fiber mesh is made of polypropylene fiber, and a plurality of fiber strips extend from the bottom of the fiber mesh and are connected to the steel mesh; the FRP cloth is aramid fiber cloth, glass fiber cloth or carbon fiber cloth.

6. The method for manufacturing a manhole cover according to any one of claims 1 to 5, characterized in that: The steel mesh includes longitudinal steel bars and transverse steel bars, and the composite hoop includes a steel hoop and an FRP cloth; First, the longitudinal steel bars are fixed on the inner surface of the composite hoop by welding, and then the transverse steel bars are fixed on the longitudinal steel bars by welding or tying, so that the steel hoop and the steel mesh form an integrated structure, and then the fiber mesh is laid on the steel mesh, and the fiber mesh laid on the steel mesh is pierced by a piercing tool, so that the fiber mesh and the steel mesh are cross-linked; Use high-strength epoxy resin glue to stick multiple layers of FRP cloth to the outside of the steel hoop and leave it for 7 to 10 days until the FRP cloth and the steel hoop are firmly attached to form a cover plate skeleton; Prepare the bottom mold and top mold of the cover plate body and the well seat, put the cover plate frame and the well seat into the corresponding bottom molds, and then cover them with the corresponding top molds and pour concrete. During the pouring process, steam curing is performed. After the concrete solidifies to a preset strength, the top mold and the bottom mold are removed in turn to obtain the cover plate body and the well seat; The shock absorbing devices are evenly installed at the bottom edge of the cover plate body.

7. The method for manufacturing a manhole cover according to claim 6, characterized in that: A preset number of bolts and locking rings are welded at preset positions of the steel mesh, and the bottom mold of the cover plate frame is provided with reserved holes adapted to the bolts and locking rings, and the relative positions of the bottom mold of the cover plate frame and the cover plate frame are adjusted so that the bolts and locking rings leak out from the corresponding reserved holes.

8. The method for manufacturing a manhole cover according to claim 7, characterized in that: A lock buckle is installed on the well seat to limit the cover plate body from being separated from the wellhead groove; The well seat is provided with a lock for limiting the cover plate body from being separated from the wellhead groove, and the lock is in a T-shaped structure so that the cover plate body can be inserted into the lock in both forward and reverse rotations.

9. The method for manufacturing a manhole cover according to claim 6 or 8, characterized in that: The bottom mold of the cover body is a plastic bottom mold, and the top mold of the cover body is a steel top mold. The steel top mold is engraved with patterns for casting and forming the label.

10. The method for manufacturing a manhole cover according to claim 9, characterized in that: Before pouring the cover plate body, the steel top form of the cover plate body is provided with a counterweight block to prevent the steel hoop from floating up during the pouring process.

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