Road manhole cover peripheral structure and construction method

Abstract

This invention provides a perimeter structure and construction method for road manhole covers. The perimeter structure includes a base reinforcement section, formed by pouring a first layer of concrete into the excavated surface of the roadbed, with multiple layers of steel mesh installed within the base reinforcement section; a permeable load-bearing section, formed by pouring permeable concrete above the base reinforcement section, with a drainage channel; a drainage pipe connected to the drainage channel, used for connecting to a drainage system; and an anchor, the lower end of which is connected to the multiple layers of steel mesh, and the upper end passing through the permeable load-bearing section and connecting to the manhole ring, used for installing the manhole cover. This invention provides a construction method for the perimeter structure of road manhole covers, constructing multiple layers of steel mesh, anchors, and drainage pipes in the excavated surface of the roadbed, and forming a composite load-bearing structure through pouring, used for installing the manhole ring and manhole cover. The beneficial effects of this invention are: reducing the risk of manhole ring settlement, increasing the drainage speed of water accumulation around the manhole, and reducing rainwater erosion of the roadbed.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a road manhole cover perimeter structure and construction method. Background Technology

[0002] In existing technologies, road drainage typically relies on drainage holes on the surface of manhole covers. However, this presents several challenges: during periods of heavy rainfall, water can easily accumulate around the manhole covers, leading to slow drainage and softening of the surrounding roadbed; the connection between the manhole cover and the roadbed is weak, resulting in uneven settlement under vehicle loads, which can even impede traffic flow in severe cases. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a road manhole cover perimeter structure and construction method, which is particularly suitable for the construction and renovation of manholes in traffic sections.

[0004] The technical solution adopted in this invention is: a road manhole cover perimeter structure, comprising: a base reinforcement section, which is formed by pouring first concrete into the roadbed excavation surface, and a multi-layer steel mesh is provided in the base reinforcement section; a permeable load-bearing section, which is formed by pouring permeable concrete on top of the base reinforcement section, and the permeable load-bearing section has a guide channel; a drainage pipe, which is connected to the guide channel and is used to connect to the drainage system; and an anchor, whose lower end is connected to the multi-layer steel mesh and whose upper end passes through the permeable load-bearing section and is connected to the manhole ring, and the manhole ring is used to install the manhole cover.

[0005] Furthermore, there are multiple anchors, which are evenly distributed along the circumference of the well ring.

[0006] Furthermore, the guide channel is arranged around the well ring, the drainage pipe is annular and located below the guide channel, the diameter of the drainage pipe is not less than the bottom width of the guide channel, the drainage pipe wall is provided with seepage holes, and the drainage pipe is wrapped with a filter layer.

[0007] Furthermore, the infiltration pipe is connected to the drainage system through branch pipes, and the branch pipes are equipped with filter structures.

[0008] Furthermore, a buffer pad is installed between the manhole cover and the manhole ring.

[0009] Furthermore, the well ring and the well cover are fastened together, and a sealing element is provided at the fastening point.

[0010] Furthermore, the surface of the permeable load-bearing part has an anti-slip texture.

[0011] On the other hand, the present invention also provides a construction method for the perimeter structure of a road manhole cover, comprising the following steps:

[0012] S1. Constructing the base reinforcement section: A multi-layer steel mesh frame is erected in the roadbed excavation surface, the anchors are fixedly connected to the multi-layer steel mesh frame, and the first concrete is poured to form the base reinforcement section;

[0013] S2. Laying drainage pipes: Laying drainage pipes in the base reinforcement section and connecting the drainage pipes to the external drainage system;

[0014] S3. Construct a permeable load-bearing section: Pour permeable concrete above the base reinforcement section to form a permeable load-bearing section, and form a guide channel in the permeable load-bearing section that is connected to the drainage pipe. The top height of the anchor is higher than the top height of the permeable load-bearing section.

[0015] S4. Install manhole ring and manhole cover: Place the manhole ring on the upper end of the anchor and fix it above the permeable load-bearing part, and install the manhole cover on the manhole ring.

[0016] The advantages and positive effects of this invention are as follows: By adopting the above-mentioned technical solution, the base layer in the roadbed excavation surface is reinforced by a multi-layer steel mesh frame, and the manhole ring is connected to the reinforced base layer through anchors to form an integral load-bearing structure, reducing the risk of manhole ring settlement; at the same time, permeable concrete is used to form a permeable load-bearing part with a diversion channel, and the water around the manhole is quickly diverted to the external drainage system through the drainage pipe, reducing the erosion of the roadbed by rainwater; it has the advantages of high integration of the manhole cover perimeter structure, good settlement control effect, and high drainage efficiency. Attached Figure Description

[0017] Figure 1 This is a structural breakdown diagram of an embodiment of the present invention in a construction scenario;

[0018] Figure 2 This is a structural breakdown diagram of one embodiment of the present invention in another construction scenario;

[0019] Figure 3 This is a schematic diagram of a well ring according to an embodiment of the present invention;

[0020] In the picture:

[0021] 1. Multi-layer steel mesh frame; 2. Anchors; 3. First concrete; 4. Permeable concrete; 5. Drainage pipe; 6. Branch pipe; 7. Well ring; 8. Well cover; 9. Clamp; 10. Diversion channel; 11. Installation groove; 12. Buffer pad; 13. Subgrade; 14. Filter layer. Detailed Implementation

[0022] The embodiments of the present invention will now be described with reference to the accompanying drawings. The described embodiments are only some embodiments of the invention, and not all embodiments.

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar units or units having the same or similar functions throughout.

[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that terms such as "installation," "connection," and "fixing" should be interpreted broadly, and can refer to direct connection, installation, or fixing, or indirect connection, installation, or fixing. The present invention does not impose any limitations in this regard.

[0025] like Figures 1 to 3 The diagram illustrates an embodiment of the road manhole cover perimeter structure of the present invention. It includes a base reinforcement section formed by pouring first concrete 3 into the excavated surface of the roadbed 13, with a multi-layer steel mesh frame 1 within the base reinforcement section; a permeable load-bearing section formed by pouring permeable concrete 4 above the base reinforcement section, the permeable load-bearing section having a guide channel 10; a drainage pipe 5 connected to the guide channel 10, used for connecting to an external drainage system, and capable of fully receiving the water collected from the guide channel 10; and an anchor 2, whose lower end is connected to the multi-layer steel mesh frame 1, and whose upper end passes through the permeable load-bearing section and connects to the manhole ring 7, used for installing the manhole cover 8. The anchor 2 firmly connects the manhole ring 7 to the multi-layer steel mesh frame 1, reducing the settlement of the manhole ring 7 under vehicle loads. Specifically, the lower end of the anchor 2 can be reliably fixed to the steel mesh frame using hooks or welding.

[0026] This invention utilizes cast concrete to form a high-bearing-capacity foundation structure that integrates well with the roadbed 13. A multi-layered steel mesh 1 reinforces the base layer of the roadbed 13 excavation surface. The manhole cover 7 is connected to the reinforced base layer via anchors 2 to form an integrated load-bearing structure, reducing the risk of settlement. Simultaneously, permeable concrete 4 forms a permeable load-bearing section with a drainage channel 10, and drainage pipes 5 quickly guide water around the manhole to the external drainage system, reducing rainwater erosion of the roadbed 13, improving the integration of the surrounding structure of the manhole cover 8 and the settlement control effect of the roadbed 13 around the manhole, increasing drainage efficiency, and extending the service life of the surrounding structure of the manhole cover 8. The permeable load-bearing section and the drainage channel 10 work together. The permeable load-bearing section utilizes its permeability to quickly infiltrate rainwater, reducing surface runoff; the drainage channel 10 acts as a redundant drainage channel when rainfall increases, collecting instantaneous runoff exceeding the permeability capacity and reducing water accumulation around the manhole. The infiltration path reduces the load on the diversion channel 10, while the runoff path avoids infiltration overload. The two complement each other and jointly reduce the risk of rainwater erosion of the roadbed 13.

[0027] The anchors 2 are multiple and evenly distributed around the manhole ring 7. The multiple evenly distributed anchors 2 enable the load of the manhole ring 7 to be evenly transferred to the roadbed 13, so that when vehicles run over the manhole cover 8 and the manhole ring 7, the force is more balanced and the risk of the manhole ring 7 tilting is reduced.

[0028] The drainage channel 10 is arranged circumferentially along the well ring 7. The drainage pipe 5 is annular and located below the drainage channel 10. The diameter of the drainage pipe 5 is not less than the bottom width of the drainage channel 10. The drainage pipe 5 has seepage holes in its wall and is wrapped with a filter layer 14 to reduce silt from entering the pipe and causing blockage. Preferably, the diameter of the drainage pipe 5 is larger than the bottom width of the drainage channel 10. The drainage pipe 5 can fully receive infiltrated rainwater, and the filter layer 14 can reduce the probability of silt entering the pipe while draining water, thus extending the maintenance cycle of the drainage system.

[0029] Preferably, the drainage pipe 5 is connected to the external drainage system via a branch pipe 6, and the branch pipe 6 is equipped with a filter structure. The filter structure further intercepts impurities, reduces the risk of drainage system blockage, and reduces the frequency of system maintenance.

[0030] Preferably, a buffer pad 12 is provided between the manhole cover 8 and the manhole ring 7. The buffer pad 12 can reduce the impact caused by vehicles running over it and reduce the hard collision between the manhole cover 8 and the manhole ring 7.

[0031] Preferably, the manhole ring 7 and the manhole cover 8 are fastened together, and a sealing element is provided at the fastening point. The manhole ring 7 and the manhole cover 8 can be fastened together quickly, and the sealing element can also reduce the possibility of rainwater seeping down along the gaps around the manhole cover 8. The permeable load-bearing part and the sealing element form a complementary "drainage and blocking" system. The permeable load-bearing part is responsible for handling large areas of rainwater on the road surface, allowing it to be discharged into the rainwater pipe network in an orderly manner through the permeable concrete 4, the diversion channel 10, and the drainage pipe 5, thus solving the problem of water accumulation on the road surface; the sealing element between the manhole ring 7 and the manhole cover 8 is responsible for reducing short-circuit seepage along the gaps in the manhole cover 8. The two work together to extend the service life of the roadbed 13.

[0032] Preferably, the surface of the permeable load-bearing part has an anti-slip texture. The anti-slip texture can improve the fixing stability of the well ring 7.

[0033] Example 1:

[0034] A three-layer steel mesh is installed within the base reinforcement section. The upper and lower layers use 12mm diameter threaded steel bars, while the middle layer uses 14mm diameter threaded steel bars, with a mesh size of 80mm × 80mm. The vertical spacing between the three layers of steel mesh is 90mm, and the three layers of steel mesh are fixedly connected by vertical tie bars spaced at 250mm intervals to form a three-dimensional steel mesh.

[0035] In this embodiment, six anchors 2 are evenly and vertically arranged around the circumference of the manhole ring 7. Each anchor 2 uses a high-strength bolt with a diameter of 25mm and has a hook at its lower end. The hook is embedded in the lower steel mesh and welded to fix it, so that the anchor 2 is reliably connected to the steel mesh frame. The upper end of the anchor 2 extends vertically upward to connect with the manhole ring 7, so that the manhole ring 7 is firmly locked to the roadbed 13, reducing the risk of overall subsidence.

[0036] The first concrete 3 was poured using C30 ordinary concrete (C30 means that the standard value of the concrete cube compressive strength is 30MPa).

[0037] The permeable concrete 4 is made of C35 permeable concrete (C35 indicates that the standard value of the concrete cube compressive strength is 35MPa). The permeable concrete 4 is poured on top of the base reinforcement part formed by the first concrete 3. 20kg / m³ of steel fiber is added to the permeable concrete 4 to improve flexural strength and impact resistance, so that the compressive strength of the permeable load-bearing part is not less than 40MPa, the flexural strength is not less than 4.5MPa, and the permeability coefficient is not less than 1×10⁻²cm / s. While meeting the load-bearing requirements of heavy traffic, it also achieves rapid water permeability. The surface of the permeable load-bearing part formed by the permeable concrete 4 has a ring-shaped anti-slip texture. Preferably, the texture depth is 4mm, and the anti-slip texture is radially distributed around the manhole cover 8.

[0038] The flow channel 10 is annular and is located in the permeable load-bearing part. The cross-section of the annular flow channel 10 gradually narrows from top to bottom, so that rainwater can flow quickly. In this embodiment, the inner wall of the channel is coated with a 10mm thick cement mortar anti-erosion layer.

[0039] The drainage pipe 5 is annular and made of HDPE double-wall corrugated pipe. Its outer wall has an annular corrugated structure, which makes the pipe more effective in resisting the pressure of vehicle loads and reducing pipe deformation under pressure. At the same time, the corrugated outer wall enhances the embedding effect between the pipe and the surrounding permeable concrete 4, improving the pipe's anti-buoyancy and anti-displacement capabilities. The diameter of the drainage pipe 5 is larger than the bottom width of the diversion channel 10. In this embodiment, the cross-section of the annular diversion channel 10 is an inverted trapezoid, with an upper bottom width of 120mm, a lower bottom width of 55mm, and a depth of 100mm. The diameter of the drainage pipe 5 is 180mm, and the side wall has seepage holes with a diameter of 9mm and a hole spacing of 50mm. The outside is wrapped with non-woven geotextile as a filter layer 14 with a basis weight of not less than 300g / ㎡ to reduce the risk of silt blockage. The drainage pipe 5 is used to collect the runoff from the diversion channel 10 and the seepage water from the permeable concrete 4.

[0040] The infiltration pipe 5 connects to the drainage system via a branch pipe 6, for example, the branch pipe 6 connects to the municipal stormwater network. A filter valve is installed inside the branch pipe 6, with a stainless steel filter screen containing a 0.5mm pore size to improve impurity interception. The branch pipe 6 has a slope of 3.5% for rapid drainage.

[0041] The manhole ring 7 is fitted onto the upper end of multiple anchors 2 and fixed by fasteners. High-strength nuts are used as fasteners and are positioned above and below the manhole ring 7. These nuts are threaded into the anchors 2 to secure the manhole ring 7. The top of the manhole ring 7 has an installation groove 11 containing a sealing element. This sealing element is a double-layered rubber sealing ring made of aging-resistant nitrile rubber. The bottom of the manhole cover 8 has a protrusion corresponding to the position of the installation groove 11. The protrusion has anti-slip textured patterns. When the manhole cover 8 is closed, the protrusion engages with the installation groove 11 and presses against the sealing ring, forming a snap-fit ​​seal. A 6mm thick buffer pad 12 is attached to the lower edge of the manhole cover 8 or the upper surface of the manhole ring 7 to mitigate the impact of vehicle traffic and reduce hard collisions between the manhole cover 8 and the manhole ring 7.

[0042] In different embodiments, the manhole ring 7 can also be reinforced by connecting it to the manhole cover 8 via a locking assembly. For example, the locking assembly is a clamp 9 arranged opposite to the manhole cover 8. The clamp 9 is arc-shaped and its shape is adapted to the manhole cover 8. The inner surface of the clamp 9 is provided with anti-slip teeth to increase the friction with the outer wall of the manhole cover 8 when the clamp 9 is locked. The first end of the clamp 9 is connected to the manhole ring 7, and the second end of the clamp 9 has a second connecting ear plate. The two second connecting ear plates are connected by a connector (e.g., an adjusting bolt) to hold the manhole cover 8 tightly. The clamp 9 provides auxiliary fixation for the manhole cover 8, reducing loosening and abnormal noise of the manhole cover 8.

[0043] On the other hand, the present invention also provides a construction method for the perimeter structure of a road manhole cover, comprising the following steps:

[0044] S1. Constructing the base reinforcement section: Excavate a foundation pit at subgrade 13 according to the design dimensions (e.g., the diameter is 800mm larger than that of well ring 7, and the depth is 650mm), and compact the subgrade 13 soil at the bottom of the foundation pit to a compaction degree ≥95%;

[0045] In the excavation face of roadbed 13, a multi-layer steel mesh is erected and fixedly connected by vertical tie bars to form a three-dimensional steel mesh frame. Anchors 2 are fixedly connected to the multi-layer steel mesh and / or tie bars to strengthen the overall bearing capacity around the manhole cover 8. Formwork is erected at the erected steel mesh frame, and the first concrete 3 (e.g., C30 ordinary concrete) is poured and compacted to form a base reinforcement section. The upper end of anchors 2 extends vertically upward from the base reinforcement section, and the concrete is cured to the design strength.

[0046] S2. Laying drainage pipe 5: Laying a ring-shaped drainage pipe 5 in the base reinforcement section. The drainage pipe 5 is wrapped with non-woven geotextile. The drainage pipe 5 is connected to the external drainage system through branch pipe 6. The branch pipe 6 is equipped with a filter valve structure with built-in stainless steel filter screen.

[0047] S3. Constructing the Permeable Load-Bearing Section: Pour permeable concrete 4 above the base reinforcement section to form the permeable load-bearing section. During the pouring of the permeable load-bearing section, a guide channel 10 is pre-reserved to connect with the drainage pipe 5. The top height of the anchor 2 is higher than the top height of the permeable load-bearing section. The inner wall of the guide channel 10 is plastered with 10mm thick cement mortar. Anti-slip textures are pressed onto the concrete surface of the permeable load-bearing section, and it is cured to the design strength.

[0048] S4. Install well ring 7 and well cover 8: Place the prefabricated well ring 7 over the anchor 2 and install it above the permeable load-bearing part. Secure the well ring 7 to the anchor 2 with fasteners. Install the well cover 8 on the well ring 7. Connect the bottom of the clamp 9 to the corresponding position of the well ring 7. Connect multiple clamps 9 with connectors to hold the well cover 8 tightly. The anti-slip teeth on the inner side of the clamp 9 fit with the well cover 8.

[0049] A gradual transition zone is provided between the outer perimeter of the permeable load-bearing section (permeable concrete 4) and the original asphalt surface layer of the road. The construction of the gradual transition zone is as follows: from the edge of the surface permeable load-bearing section towards the asphalt surface layer, the amount of permeable concrete 4 gradually decreases, while the amount of asphalt material gradually increases, forming a transition layer with continuously changing material proportions. The method of proportion change and control is existing technology and will not be elaborated in this invention. The gradual transition zone can reduce rigid joints, reduce joint cracking and water seepage caused by frequent vehicle traffic, thereby improving structural stability and extending the service life of the road.

[0050] S5. Finished product inspection: Sprinkle water around the manhole cover 8 to test the drainage effect and check whether the drainage pipe 5 drains smoothly; use a vehicle to simulate rolling to test whether the manhole cover 8 is loose or makes any abnormal noise; check the road surface flatness and the transition effect at the joints. After passing the test, the road can be opened to traffic.

[0051] This invention is adaptable to conventional manhole covers 8 (such as rainwater manholes, sewage manholes, communication manholes, etc.). The reinforced base layer and permeable load-bearing part formed by casting create a composite load-bearing structure that is tightly integrated with the roadbed 13, reducing the risk of settlement of the manhole ring 7 and road surface cracking. The anchor 2 strengthens the connection between the manhole ring 7 and the roadbed 13, reducing the settlement of the manhole ring 7. The settlement of the roadbed 13 is no more than 5mm, and it can also significantly improve the load-bearing capacity for passing vehicles. Multiple clamps 9 connected to the manhole ring 7 work together to hold the manhole cover 8 tightly, reducing the loosening and displacement of the manhole cover 8. The loosening rate of the manhole cover 8 is no more than 3%. The sealing parts and the buffer pad 12 work together to extend the service life of the structure and reduce abnormal noise when vehicles run over it. Part of the rainwater on the road surface seeps down along the permeable pores of the permeable load-bearing part, and the other part flows into the diversion channel 10, increasing the rainwater drainage speed by more than 60%, significantly reducing water accumulation around the manhole cover 8. The filtration structure reduces drainage system blockage and reduces maintenance frequency.

[0052] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A perimeter structure for a road manhole cover, characterized in that, include: The base reinforcement section is formed by pouring the first concrete into the roadbed excavation surface, and a multi-layer steel mesh is provided inside the base reinforcement section; The permeable load-bearing part is formed by pouring permeable concrete on top of the base reinforcement part, and the permeable load-bearing part has a guide channel; A drainage pipe, which is connected to the guide channel, is used to connect to the drainage system; An anchor, the lower end of which is connected to the multi-layer steel mesh frame, and the upper end which passes through the permeable load-bearing part and is connected to the well ring, the well ring being used to install the well cover.

2. The perimeter structure of the road manhole cover according to claim 1, characterized in that, The anchors are multiple and are evenly distributed along the circumference of the well ring.

3. The perimeter structure of the road manhole cover according to claim 1, characterized in that, The guide channel is arranged around the circumference of the well ring. The drainage pipe is annular and located below the guide channel. The diameter of the drainage pipe is not less than the bottom width of the guide channel. The drainage pipe has drainage holes in its wall and is wrapped with a filter layer.

4. The perimeter structure of the road manhole cover according to claim 3, characterized in that, The drainage pipe is connected to the drainage system through a branch pipe, and the branch pipe is equipped with a filter structure.

5. The perimeter structure of the road manhole cover according to any one of claims 1-4, characterized in that, A buffer pad is provided between the manhole cover and the manhole ring.

6. The perimeter structure of the road manhole cover according to any one of claims 1-4, characterized in that, The well ring is fastened to the well cover, and a sealing element is provided at the fastening point.

7. The perimeter structure of the road manhole cover according to any one of claims 1-4, characterized in that, The surface of the permeable load-bearing part has an anti-slip texture.

8. A construction method for the perimeter structure of a road manhole cover, used for the perimeter structure of a road manhole cover as described in any one of claims 1-7, characterized in that, The construction steps include the following: S1. Constructing the base reinforcement section: A multi-layer steel mesh frame is erected in the roadbed excavation surface, anchors are fixedly connected to the multi-layer steel mesh frame, and the first concrete is poured to form the base reinforcement section; S2. Laying drainage pipes: Laying drainage pipes in the base reinforcement section and connecting the drainage pipes to the external drainage system; S3. Constructing a permeable load-bearing section: Pour permeable concrete above the base reinforcement section to form a permeable load-bearing section, and form a guide channel in the permeable load-bearing section that communicates with the drainage pipe. The top height of the anchor is higher than the top height of the permeable load-bearing section. S4. Install the well ring and well cover: Place the well ring on the upper end of the anchor and fix it above the permeable load-bearing part, and install the well cover on the well ring.

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