Leveling device
By using leveling devices and grouting technology, common quality problems such as settlement around manholes have been solved, improving the smoothness between manholes and road surfaces and facilitating construction, thus enhancing the aesthetics and safety of municipal roads.
Patent Information
- Application Number
- CN202520201935.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-10
AI Technical Summary
Common quality problems such as settlement, cracks, and damage often occur around manholes on municipal roads, affecting the overall integrity, aesthetics, and driving comfort of the road surface. Moreover, the construction process disrupts traffic, and the problems are prone to recurrence after repair.
Design a leveling device including a concrete ring, an adjusting base, an adjusting sleeve, and an adjusting screw. The adjusting screw makes the manhole cover flush with the road surface, and the device is combined with a grouting pipe for bonding and reinforcement, thereby improving the compactness and strength of the backfill.
It improves the smoothness between the inspection well and the surrounding road surface, prevents damage, and enhances the aesthetics, driving comfort, and durability of municipal roads.
Smart Images
Figure CN223838127U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of municipal road inspection well construction, and more specifically, it relates to a leveling device. Background Technology
[0002] Municipal roads not only serve motor vehicles, non-motor vehicles, and pedestrians, but also house pipelines for various public facilities such as urban sewage and rainwater. These pipelines require numerous manholes for maintenance. Due to factors such as design concepts, construction techniques, the quality of backfilling the manhole trenches, and vehicle loads, the area around these manholes where they connect to the road surface often becomes a weak point. Road surface subsidence, cracks, damage, manhole protrusion, and sinking around manholes are common quality problems in municipal roads, severely impacting the overall integrity and aesthetics of the road surface, as well as driving comfort and even causing accidents. Furthermore, maintenance around manholes can only be done manually or mechanically by excavating, backfilling, compacting, or pouring concrete, resulting in a large work area that severely disrupts traffic. Additionally, the use of cold joints in the repaired road surface makes it susceptible to water seepage, weakening its structural integrity and potentially leading to recurring problems over time. Utility Model Content
[0003] The purpose of this invention is to design a leveling device to guide the construction of manholes on municipal roads. This leveling device is highly adaptable, easy to operate, and can effectively improve the smoothness between the manhole and the surrounding road surface, significantly improve the density and strength of the backfill around the manhole, prevent and avoid defects around the manhole, and enhance the aesthetics, driving comfort, safety and durability of municipal roads.
[0004] This utility model provides a leveling device for adjusting the horizontal and vertical alignment of the top of the manhole with the road surface, including a concrete ring, an adjusting base, an adjusting sleeve, and an adjusting screw.
[0005] The concrete ring is made of cement concrete with a strength of C30 or higher and a thickness of 10cm.
[0006] The adjustment base is divided into upper and lower layers, with the upper layer having a larger area than the lower layer. The upper layer is embedded and fixed in a concrete ring.
[0007] The adjusting sleeve is a cylindrical tube with internal threads and is welded to the lower layer of the adjusting base;
[0008] The adjusting screw is divided into an upper part, a middle part and a lower part. The upper part of the adjusting screw is a metal threaded round rod that matches the thread inside the adjusting sleeve. The diameter of the round rod is the same as the inner diameter of the adjusting sleeve. The middle part of the adjusting screw is a hexagonal metal part. The lower part of the adjusting screw is a smooth metal round rod, and the lower end of the adjusting screw is hemispherical.
[0009] The top of the inspection well is arranged from top to bottom with an inspection well cover, a leveling device, and a prefabricated inspection well section. When leveling, the concrete ring is turned over to make the inspection well cover flush with the road surface.
[0010] The method for constructing inspection wells to prevent perimeter defects, based on the aforementioned leveling device, includes the following steps:
[0011] S1. Prepare a leveling device for later use;
[0012] S2. Measure and locate the center coordinates of the manhole, excavate mechanically to the design bottom elevation of the manhole, lay a sand and gravel cushion layer and compact it, pour the concrete foundation of the manhole, place the concrete foundation of the precast pipe, lay the sand and gravel cushion layer foundation of the precast pipe and compact it.
[0013] S3. Install prefabricated pipes on both sides of the manhole and the first section of the prefabricated manhole section. Based on the distance from the bottom elevation of the manhole to the top surface of the road base, install several sections of the prefabricated manhole section, so that the elevation of the highest manhole section is slightly higher than the top surface of the road base. Use masonry mortar to seal the gaps between the sections to enhance the overall integrity.
[0014] S4. Install three grouting pipes at a 120-degree angle around the inspection well. The grouting pipes are made of metal round pipes with grouting holes spaced 20-30cm apart on the pipe body. The grouting holes are single holes with a diameter of about 3cm. The grouting pipes are fixed to the inspection well wall with fasteners.
[0015] S5. Lay the sand and gravel backfill layer around the precast manhole section and compact it layer by layer. Then lay the road subbase and road base and compact it layer by layer. The subbase and base around the precast manhole section are locally compacted using a small road roller.
[0016] S6. Use a grouting pump to pump cement grout into three grouting pipes. Stop grouting after reaching the grouting volume determined by the test and reverse excavation. Seal the pipe openings and let stand for more than 5 hours.
[0017] S7. Install the leveling device. Place the lower end of the adjusting screw on the top surface of the highest section of the precast manhole section 5, adjust the screwing depth, and at the same time measure the elevation of each point of the concrete ring so that the top surface of the concrete ring plus the height of the manhole cover is flush with the top surface of the road asphalt surface, and ensure that the manhole cover meets the requirements of the road's cross slope and longitudinal slope, and ensure that the top surface of the installed manhole cover is smoothly connected to the road surface in both the transverse and longitudinal directions.
[0018] S8. Install an inner formwork inside the concrete ring. The inner formwork is a metal ring plate with a flange on the top surface. The width of the flange plate on the top surface of the inner formwork is smaller than the width of the top surface of the concrete ring. The inner formwork is hung on the top surface of the concrete ring by the flange plate on the top surface. The bottom surface of the inner formwork is lower than the top surface of the highest section of the precast inspection well. Install an outer formwork 5 cm higher than the bottom surface of the concrete ring at a distance of 50 cm from the outside of the inspection well wall. Pour C30 grade or higher filling concrete. After the demolding strength is reached, remove the inner and outer formwork and cure for more than 7 days.
[0019] S9. Install manhole covers on the concrete ring, lay the road asphalt base course and the lower layer in two layers and compact them. Use a small road roller to locally compact the asphalt base course around the precast manhole section.
[0020] S10. Lay and compact the asphalt surface layer of the road. The manhole area and other parts are compacted simultaneously. After heating the manhole cover with a spray gun, clean the adhering asphalt and gravel.
[0021] As a further embodiment of this utility model: when implementing step S4, expansion bolts and U-shaped retaining rings are selected as the fixing components.
[0022] As a further embodiment of this utility model: the concrete ring is made of small stone concrete with a maximum particle size of less than or equal to 10 mm.
[0023] As a further embodiment of this utility model: the hexagonal metal part in the middle of the adjusting screw is suitable for turning with a conventional wrench, and the outer diameter of the hexagonal metal part is consistent with the diameter of the adjusting sleeve.
[0024] As a further embodiment of this utility model: the lower part of the prefabricated inspection well section is selected as a 1m standard segment, and the upper part can be selected as a 30cm to 50cm non-standard segment according to actual construction needs.
[0025] As a further embodiment of this utility model: the manhole cover is made of metal, the upper part of the manhole cover is circular with the same diameter as the outer diameter of the concrete ring, the lower part of the manhole cover is annular with a diameter smaller than the inner diameter of the concrete ring of the leveling device, and the wall thickness of the annular ring is 1cm.
[0026] The beneficial effects of this utility model are as follows:
[0027] In actual manhole construction, this utility model's leveling device can replace the highest precast manhole section in municipal road construction. By rotating the adjusting screw, the horizontal and vertical slopes of the manhole cover placed on the leveling device can be made consistent with the top surface of the asphalt pavement, and the elevation can be flush with the top surface of the asphalt pavement. This ensures that the horizontal and vertical connections of the top surface of the installed manhole cover are smooth with the road surface. This leveling device is highly adaptable, easy to operate, and convenient for construction.
[0028] In the construction method of this utility model, grouting pipes are installed to inject grout into the subbase and base course of the road. After the leveling device is installed and adjusted, a filling concrete about 50cm wide is poured. This not only fills the pores of the sand and gravel backfill layer, the subbase and base course around the manhole with cement grout and reinforces them, but also sets a concrete filling ring at the bottom of the asphalt surface layer around the manhole. This can significantly improve the density and strength of the backfill around the manhole, prevent and avoid uneven settlement, subsidence, damage and other defects of the road surface around the manhole, and improve the aesthetics, driving comfort, safety and durability of the municipal road. Attached Figure Description
[0029] Figure 1 This is a schematic diagram illustrating the construction effect of the leveling device proposed in this utility model for preventing well perimeter defects in inspection well construction methods.
[0030] Figure 2 This is a three-dimensional perspective structural diagram of the leveling device proposed in this utility model;
[0031] Figure 3 This is a schematic diagram of the overall structure of the leveling device proposed in this utility model;
[0032] Figure 4 This is a schematic diagram of the front structure of the leveling device proposed in this utility model;
[0033] Figure 5 This is a schematic diagram of the structure for realizing the adjusting function of the leveling device proposed in this utility model.
[0034] In the diagram: 1. Gravel cushion layer; 2. Manhole concrete foundation; 3. Precast pipe concrete foundation; 4. Precast pipe; 5. Precast manhole section; 6. Gravel backfill layer; 7. Grouting pipe; 8. Grouting hole; 9. Road subbase; 10. Road base; 11. Road asphalt base and lower layer; 12. Fastener; 13. Road asphalt surface layer; 14. Filling concrete; 15-1. Concrete ring; 15-2. Adjusting base; 15-3. Adjusting sleeve; 15-4. Adjusting screw; 15-5. Inner formwork; 16. Manhole cover. Detailed Implementation
[0035] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.
[0036] At least one embodiment of this utility model discloses a leveling device for adjusting the horizontal and vertical alignment of the top of the manhole with the road surface, such as... Figure 1 - Figure 5 As shown, it includes a concrete ring 15-1, an adjusting base 15-2, an adjusting sleeve 15-3, and an adjusting screw 15-4;
[0037] The concrete ring 15-1 is made of cement concrete with a strength of C30 or higher and a thickness of 10cm.
[0038] The adjusting base 15-2 is divided into upper and lower layers, with the upper layer having a larger area than the lower layer. The upper layer is embedded and fixed in the concrete ring 15-1.
[0039] The adjusting sleeve 15-3 is a cylindrical tube with internal threads and is welded to the lower layer of the adjusting base 15-2;
[0040] The adjusting screw 15-4 is divided into an upper part, a middle part and a lower part. The upper part of the adjusting screw 15-4 is a metal threaded round rod that matches the internal thread of the adjusting sleeve 15-3. The diameter of the round rod is the same as the inner diameter of the adjusting sleeve 15-3. The middle part of the adjusting screw 15-4 is a hexagonal metal part. The lower part of the adjusting screw 15-4 is a smooth metal round rod, and the lower end of the adjusting screw 15-4 is hemispherical.
[0041] The top of the inspection well is arranged from top to bottom with an inspection well cover 16, a leveling device and a prefabricated inspection well section 5. When leveling, the concrete ring 15-1 is overlapped with the inspection well cover 16 by turning the adjusting screw 15-4 so that it is flush with the road surface.
[0042] The method for constructing inspection wells to prevent perimeter defects, based on the aforementioned leveling device, includes the following steps:
[0043] S1. Prepare a leveling device for later use;
[0044] S2. Measure and locate the center coordinates of the manhole, excavate mechanically to the design bottom elevation of the manhole, lay a sand and gravel cushion layer 1 and compact it, pour the concrete foundation 2 of the manhole, place the concrete foundation 3 of the precast pipe, lay the sand and gravel cushion layer foundation of the precast pipe 4 and compact it.
[0045] S3. Install the first section of the prefabricated pipes 4 and prefabricated manhole sections 5 on both sides of the manhole. Based on the distance from the bottom elevation of the manhole to the top surface of the road base 10, install several sections of prefabricated manhole sections 5, so that the elevation of the highest manhole section is slightly higher than the top surface of the road base 10. The gaps between the sections are sealed with masonry mortar to enhance the overall integrity.
[0046] S4. Three grouting pipes 7 are installed at a 120-degree angle around the inspection well. The grouting pipes 7 are made of metal round pipes and have grouting holes 8 spaced 20-30cm apart on the pipe body. The grouting holes 8 are single holes with a diameter of about 3cm. The grouting pipes 7 are fixed to the inspection well wall by fasteners 12.
[0047] S5. Lay the sand and gravel backfill layer 6 around the precast manhole section 5 and compact it layer by layer. Then lay the road subbase 9 and road base 10 and compact them layer by layer. The subbase and base around the precast manhole section 5 are locally compacted using a small road roller.
[0048] S6. Use a grouting pump to pump cement grout into three grouting pipes 7. Stop grouting after reaching the grouting volume determined by the test and reverse excavation, and seal the pipe opening of the grouting pipe 7 and let it stand for more than 5 hours.
[0049] S7. Install the leveling device. Place the lower end of the adjusting screw 15-4 on the top surface of the highest section of the precast manhole section 55, adjust the screwing depth of the adjusting screw 15-4, and at the same time measure the elevation of each point of the concrete ring 15-1 so that the top surface of the concrete ring 15-1 plus the height of the manhole cover 16 is flush with the top surface of the road asphalt surface layer 13, and make the manhole cover 16 meet the requirements of the road cross slope and longitudinal slope, and ensure that the top surface of the manhole cover 16 is smoothly connected to the road surface in both the transverse and longitudinal directions.
[0050] S8. Install an inner formwork 15-5 inside the concrete ring 15-1. The inner formwork 15-5 is a metal ring plate with a flange on the top surface. The width of the flange plate on the top surface of the inner formwork 15-5 is smaller than the width of the top surface of the concrete ring 15-1. The inner formwork 15-5 is hung on the top surface of the concrete ring 15-1 by the flange plate on the top surface. The bottom surface of the inner formwork 15-5 is lower than the top surface of the highest section of the precast inspection well section 5. Install an outer formwork 5cm higher than the bottom surface of the concrete ring 15-1 at a distance of 50cm from the outside of the inspection well wall. Pour C30 grade or higher filling concrete 14. After reaching the demolding strength, remove the inner and outer formwork and cure for more than 7 days.
[0051] S9. Place the manhole cover 16 on the concrete ring 15-1, lay the road asphalt base course and the lower layer 11 in two layers and compact them. The asphalt base course around the precast manhole section 5 is locally compacted by a small road roller.
[0052] S10. Lay the asphalt surface layer 13 and compact it. The manhole area and other parts are compacted simultaneously. After heating the manhole cover 16 with a spray gun, clean the adhering asphalt and gravel.
[0053] It should be noted that the time units mentioned above in the construction methods and steps for manholes are expressed in letters for brevity, where h represents hours and d represents days.
[0054] In actual manhole construction, the leveling device can replace the highest precast manhole section of the manhole in municipal road construction. By rotating the adjusting screw 15-4, the horizontal and vertical slopes of the manhole cover 16 placed on the leveling device can be made consistent with the top surface of the asphalt surface layer 13 of the road, and the elevation can be flush with the top surface of the asphalt surface layer. This ensures that the horizontal and vertical connections of the top surface of the manhole cover 16 are smooth with the road surface. The leveling device is highly adaptable, easy to operate, and convenient for construction.
[0055] Furthermore, in the above-mentioned construction method, by setting up grouting pipes 7, grouting is carried out after the subbase 9 and base course of the construction road. After the leveling device is installed and adjusted into place, a filling concrete 14 with a width of about 50cm is poured. This not only fills the pores of the sand and gravel backfill layer 6, the subbase 9, and the base course around the manhole with cement grout and reinforces them, but also sets up a concrete filling ring at the bottom of the asphalt surface layer around the manhole. This can greatly improve the density and strength of the backfill around the manhole, prevent and avoid uneven settlement, subsidence, damage and other defects of the road surface around the manhole, and improve the aesthetics, driving comfort, safety and durability of the municipal road.
[0056] Furthermore, when implementing step S4, the fastener 12 is selected from expansion bolts and U-shaped retaining rings.
[0057] Furthermore, concrete ring 15-1 is made of small stone concrete with a maximum particle size of less than or equal to 10 mm.
[0058] Furthermore, the hexagonal metal part in the middle of the adjusting screw 15-4 is suitable for tightening with a conventional wrench, and the outer diameter of the hexagonal metal part is consistent with the diameter of the adjusting sleeve 15-3.
[0059] Furthermore, the lower part of the prefabricated inspection well section 5 uses a standard 1m segment, while the upper part can be a non-standard segment of 30cm to 50cm, depending on the actual construction needs.
[0060] Furthermore, the manhole cover 16 is made of metal. The upper part of the cover is circular, with the same diameter as the outer diameter of the concrete ring 15-1. The lower part of the cover is annular, with a diameter smaller than the inner diameter of the leveling device concrete ring 15-1. The wall thickness of the annular ring is 1cm.
[0061] Based on the above implementation, the construction method and leveling device are highly adaptable and easy to operate. They can effectively improve the smoothness between the manhole and the surrounding road surface, significantly increase the density and strength of the backfill around the manhole, prevent and avoid defects around the manhole, and improve the aesthetics, driving comfort, safety and durability of municipal roads.
[0062] The embodiments of the present utility model have been described above. However, the present embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.
Claims
1. A leveling device for adjusting the horizontal and vertical alignment of the top of a manhole with the road surface, characterized in that, It includes a concrete ring (15-1), an adjusting base (15-2), an adjusting sleeve (15-3), and an adjusting screw (15-4); The concrete ring (15-1) is made of cement concrete with a strength of C30 or higher and a thickness of 10cm; The adjusting base (15-2) is divided into upper and lower layers, with the upper layer having a larger area than the lower layer. The upper layer is embedded and fixed in the concrete ring (15-1). The adjusting sleeve (15-3) is a cylindrical tube with internal threads, which is welded to the lower layer of the adjusting base (15-2); The adjusting screw (15-4) is divided into an upper part, a middle part and a lower part. The upper part of the adjusting screw (15-4) is a metal threaded round rod that matches the thread inside the adjusting sleeve (15-3). The diameter of the round rod is the same as the inner diameter of the adjusting sleeve (15-3). The middle part of the adjusting screw (15-4) is a hexagonal metal part. The lower part of the adjusting screw (15-4) is a smooth metal round rod, and the lower end of the adjusting screw (15-4) is hemispherical. The top of the inspection well is arranged from top to bottom with an inspection well cover (16), a leveling device and a prefabricated inspection well section (5). When leveling, the concrete ring (15-1) is overlapped with the inspection well cover (16) and flush with the road surface by turning the adjusting screw (15-4).
2. The leveling device according to claim 1, characterized in that, The concrete ring (15-1) is made of small stone concrete with a maximum particle size of less than or equal to 10 mm.
3. The leveling device according to claim 1, characterized in that, The hexagonal metal part in the middle of the adjusting screw (15-4) is suitable for turning with a conventional wrench, and the outer diameter of the hexagonal metal part is consistent with the diameter of the adjusting sleeve (15-3).