Concrete pavement subsidence nondestructive repair device

Abstract

The invention discloses a concrete pavement subsidence lossless repairing device which is composed of a drilling device, a pressure injection pipe, a foam filling agent, a mixed pressure injection device and a hole sealing material, the drilling device is used for drilling a concrete pavement slab, the pressure injection pipe is embedded and fixed in a drilled hole, the foam filling agent is a bi-component material, and the mixed pressure injection device is used for sealing the mixed pressure injection device. After being mixed by the mixing and pressure-injection device and sprayed out through the pressure-injection pipe, the volume is rapidly expanded, gaps below the pavement slab are continuously filled, and the pavement slab is lifted. According to the method, a hole is drilled in a sunken pavement concrete slab by adopting a drilling device, a filling agent is injected into a gap below the pavement slab from a pressure injection pipe, the gap below the pavement slab can be completely filled with expanded foam, and the sunken pavement slab can be lifted and recovered to the original elevation within several minutes along with continuous expansion of the foam; and finally, the pressure injection pipe is pulled out, the drilled hole is filled and leveled up with a hole sealing material, and pavement subsidence lossless repair is completed. The pavement slab is continuously lifted through the expansion pressure of the filling agent in the gap below the slab, and the method has the characteristics of early strength and high strength, and is a convenient method for rapidly and losslessly repairing the non-uniform subsidence pavement.

Description

Technical Field

[0001] The invention relates to the field of road reinforcement and is a non-destructive repair device for concrete pavement subsidence, which can be widely used in repairing and treating pavement subsidence problems caused by foundation settlement, soil loss, underground cavities and the like. Background Art

[0002] Roads refer to passage facilities for pedestrians, vehicles or other means of transportation, and are a basic component of land transportation. The function of roads is to provide convenient conditions for passage and transportation for human activities, and they can be of various types according to their uses and forms. Among them, concrete pavement is a type of pavement widely used in roads, airport runways, parking lots, industrial plants and other fields, and is known for its high strength, durability and stability.

[0003] Concrete pavement subsidence is a common pavement disease, usually caused by uneven roadbed settlement, improper construction, overloading, poor drainage and other reasons. If the subsidence is not repaired in time, it will affect driving safety and road life, so it needs to be repaired in time. When the pavement subsidence is caused by foundation problems, the foundation is usually reinforced by refilling the roadbed material and compacting it, but this solution generally requires the demolition of the original pavement structure. First, the road repair cycle is long, which affects the original road traffic; second, the construction cost of demolishing and re-paving the road is high and economical. This re-filling and paving method not only increases the maintenance cost of the road, but also seriously affects the roads that are in operation, and has an adverse impact on the daily commuting of vehicles and people. Therefore, it is necessary to find a fast, efficient and low-cost road subsidence repair method to solve the above problems under the premise of effectively reducing the negative impact of road repair on traffic. Grouting lifting technology is one of the efficient methods to repair concrete pavement subsidence, which is suitable for situations where the roadbed has not completely failed but the subsidence is more obvious. Summary of the invention

[0004] The purpose of the present invention is to drill holes directly on the original concrete pavement slabs without destroying the original pavement slab structure to solve the pavement slab subsidence or roadbed holes caused by insufficient bearing capacity of the shallow layer of the roadbed. A two-component foam filler that can expand rapidly is injected into the road surface holes under the slab through the drilled holes on the slab surface. The road slab is lifted by the powerful expansion pressure of the two-component foam. The roadbed filling material can reach extremely high strength within minutes, effectively lift the concrete slab and improve the bearing capacity of the foundation, thereby realizing rapid and efficient completion of pavement subsidence repair.

[0005] The outstanding advantages of the present invention are: first, the road repair method of the present invention is a non-destructive repair, which does not require the destruction of the original road structure and has almost no impact on the original road traffic; second, the road repair method of the present invention can be quickly constructed, and the volume of the two-component material expands a hundred times after mixing, and the strength reaches 90% in 15 minutes. The compressive strength after hardening reaches 50MPa, and the total construction time does not exceed half an hour.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the present invention is a non-destructive repair device for concrete pavement subsidence and its implementation method, which is characterized in that: the device consists of a drilling device, an injection pipe, a foam filler, a mixed injection device and a sealing material, the drilling device is used for drilling holes in concrete road panels, the injection pipe is buried in the drilled holes and inserted under the panel surface, the foam filler is a two-component material, the mixed injection device mixes the two-component materials and sprays them into the gap under the concrete road panel, the volume expands rapidly after mixing and lifts the road panel, and after the road panel is lifted, the sealing material is used to fill the drilled holes on the flat surface, thereby completing the non-destructive repair of the road surface.

[0007] Furthermore, the drilling device is used for drilling holes in concrete road panels. In areas where the road surface needs to be repaired for subsidence, the drilling device is used to drill holes in the panel surface. The injection pipe is buried in the drill hole and extends under the panel surface. The foam filler is mixed through the mixing injection device and sprayed into the gap below the concrete panel through the injection pipe.

[0008] Furthermore, the foam filler is composed of a two-component material of double-spray polyurethane and petroleum-based isocyanate, which expands a hundred times in volume after mixing, reaches a strength of 90% in 15 minutes, and has a compressive strength of 50MPa after hardening.

[0009] Furthermore, the injection pipe of the mixing and injection device mixes and sprays the two-component materials of the foam filler in the gap below the concrete road slab. After spraying, the volume expands rapidly to fill the gap, and at the same time, the concrete road slab is continuously lifted under the action of the expansion pressure in the limited gap.

[0010] Furthermore, it is preferred to use a level meter or a laser meter to monitor the lifting of the plate in real time to prevent excessive or uneven lifting.

[0011] Furthermore, when the sunken road slab is lifted and restored to the original design elevation, the injection pipe is removed and the holes drilled in the slab are filled with sealing materials to complete the non-destructive repair of the road subsidence.

[0012] Repeating the above steps can complete the non-destructive repair of road subsidence in different areas, thereby meeting the overall deformation repair of longitudinal roads, factory yards, etc.

[0013] The implementation steps adopted by the present invention are: First, mark the hollow and sunken areas of the road slab surface, drill holes in the hollow and sunken areas using a drilling device, and press the injection pipe downward into the drilled holes.

[0014] Secondly, the nozzle of the mixing injection device is inserted into the injection pipe, and the two-component materials of the foam filler are mixed through the mixing injection device and sprayed into the gap under the concrete road slab. The volume of the mixed foam filler expands rapidly and continuously lifts the concrete road slab within the limited gap.

[0015] Secondly, monitor the lifting of the road slab in real time to prevent excessive or uneven lifting. When the lifting of the slab is completed, remove the injection tube and use sealing materials to fill the drilled holes in the slab and cut off part of the foam squeezed out of the slab seams to complete the non-destructive repair of the road subsidence in the area.

[0016] By repeating the above steps, non-destructive repair of road surfaces in large areas with different subsidence areas can be completed.

[0017] Compared with the existing traditional demolition and replacement repair methods, the beneficial effects of the present invention are: first, the non-destructive repair project is small, the construction speed is fast, and the interference with traffic or factory operations is small; second, the volume of the two-component repair material expands rapidly after mixing, quickly reaches the design strength, and has high strength after hardening, so the road yard can be quickly put into use after repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 A schematic cross-sectional diagram of a plate surface drilling of a non-destructive repair device for concrete pavement subsidence according to the present invention; Figure 2 It is a cross-sectional schematic diagram of a mixed grouting plate surface lifting device for non-destructive repair of concrete pavement subsidence of the present invention; Figure 3 It is a cross-sectional schematic diagram of a non-destructive repair device for concrete pavement subsidence according to the present invention, in which the plate surface is lifted and the holes are sealed; Figure 4 The present invention is a flowchart for implementing the operation of a non-destructive repair device for concrete pavement subsidence.

[0020] In the figure: the device consists of a drilling device 1, a pressure injection pipe 2, a foam filler 3, a mixed pressure injection device 4 and a sealing material 5. For ease of explanation, the device also involves a concrete slab panel 6 in the original road or yard, a gap under the slab surface 7, and a foundation 8 after the subsidence.

[0021] The drilling device 1 consists of a drill rod 11 and a power assembly 12. The drill rod 11 is driven by the power assembly 12 to rotate or impact at high speed and is used for drilling holes in the concrete road panel 6. The drilling diameter is generally 20-40 mm, which is determined according to the size of the gap 7 under the road panel 6 and the amount of filling. A large aperture is used when the gap 7 is large and the filling amount is large, and a small aperture is used when the gap 7 is small and the filling amount is small.

[0022] The injection tube 2 can be a metal tube 21 or a composite material tube 22. The outer diameter of the lower part is about 2-3 mm larger than the opening diameter to facilitate fixing the tube position when burying the injection tube 2 after the hole is opened in the plate surface 6. The upper part is an enlarged head for inserting the nozzle 41 at the lower end of the mixing injection device 4.

[0023] The foam filler 3 is a two-component material of double-spray polyurethane 31 and petroleum-based isocyanate 32. The volume of the two-component material expands 100 times after mixing, the strength reaches 90% in 15 minutes, and the compressive strength reaches 50 MPa after hardening.

[0024] The mixing and injection device 4 is composed of a nozzle 41 at the lower end, a slurry mixer 42, a double spray polyurethane 31 delivery pipe 43 and a petroleum-based isocyanate 32 delivery pipe 44.

[0025] The sealing material 5 is used to fill the holes drilled in the flat plate surface 6 after the plate surface 6 is lifted. Preferably, epoxy mortar 51 or cement mortar 52 is used. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] The present invention is described in detail below in conjunction with the accompanying drawings: Example

[0029] The storage yard and roads in the rear factory area of ​​a certain port area suffered from large-scale concrete surface ground subsidence due to insufficient bearing capacity of the local foundation and poor drainage in the water-adding area under heavy pressure loads. However, the concrete panels in most areas did not suffer structural damage.

[0030] Therefore, when choosing a road subsidence treatment plan, considering that most concrete panels have no structural damage, there is no need to break and repair the concrete panels and re-pour the concrete surface layer. A non-destructive repair plan of grouting pressure lifting can be adopted, which has less workload and does not damage the original concrete panel structure. This plan is an efficient method to repair concrete road subsidence and is suitable for situations where the roadbed has not completely failed but the subsidence is more obvious.

[0031] Pavement subsidence grouting and lifting method is an efficient and economical repair technology, which is mainly used to solve the local or medium-scale subsidence problem of concrete pavement. By injecting slurry into the foundation, filling the gaps, strengthening the foundation and lifting the sunken pavement slabs, the pavement flatness and bearing capacity are restored.

[0032] Finally, after comparing multiple plans, the embodiment project adopted a non-destructive repair device for concrete pavement subsidence provided by the present invention to implement non-destructive repair of factory yard and road subsidence.

[0033] The details are as follows: See also Figures 1 to 3 The present invention provides a non-destructive repair device for concrete road subsidence, which is composed of a drilling device 1, an injection pipe 2, a foam filler 3, a mixed injection device 4 and a sealing material 5, and also involves a concrete slab panel 6 in the original road, a gap 7 under the slab surface 6, and a foundation 8 after the subsidence. The drilling device 1 is used for drilling holes in the concrete road slab 6, the injection pipe 2 is buried in the drilled hole and inserted under the slab surface 6, the foam filler 3 is a two-component material, and the mixed injection device 4 mixes the two-component materials and sprays them into the gap 7 under the concrete road slab 6. After the two-component foam filler 3 is mixed, the volume expands rapidly and lifts the road slab 6. After the road slab 6 is lifted to the original elevation, the sealing material 5 is used to fill the drilled holes in the slab surface 6, and the non-destructive repair of the road surface is completed.

[0034] The specific implementation parameters and steps are as follows: The thickness of the original yard concrete panel is 20cm, and the thickness of the road panel is 25cm. Double-layer bidirectional steel mesh is used. The panel plane size is 6m×6m, and the concrete strength grade is C30. On-site measurements found that the maximum settlement of the factory yard and road was 20cm. Due to the good construction quality of the concrete panel, no large-scale concrete panel damage occurred on site.

[0035] First, an electric drilling device 1 is used to drill a hole on the concrete panel 6 that needs to be repaired for road subsidence. The diameter of the hole is 30 mm, and the depth of the hole penetrates the concrete panel 6 where the subsidence occurs to the lower gap 7.

[0036] Secondly, the injection pipe 2 is pressed into the drilled hole of the concrete panel 6. The injection pipe 2 in the embodiment adopts a PE composite material pipe 22 with an outer diameter of 32 mm, an inner diameter of 24 mm, and a length of 30 cm. The nozzle 41 of the mixing injection device 4 is inserted into the injection pipe 2. The nozzle 41 adopts a metal pipe with an outer diameter of 22 mm, an inner diameter of 18 mm, and a length of 25 mm. The foam filler 3 is delivered to the mixing injection device 4 through the double spray polyurethane 31 delivery pipe 43 and the petroleum-based isocyanate 32 delivery pipe 44, and the two-component materials are mixed by the mixing injection device 4 and then sprayed into the gap 7 below the concrete road panel 6 through the nozzle 41 and the injection pipe 2. The mixed two-component foam filler 3 rapidly expands more than 100 times in volume within 5 seconds, and the pressure in the limited gap 7 increases to continuously lift the concrete road panel 6. At the same time, it is preferred to use a level meter or a laser meter for monitoring. The embodiment uses a level meter to monitor the lifting of the road panel 6 in real time to prevent excessive lifting or uneven lifting.

[0037] Finally, when the road panel 6 is lifted and restored to the original design elevation, the injection pipe 2 is pulled out and the holes are sealed with a sealing material 5. The sealing material 5 preferably uses epoxy mortar 51 or cement mortar 52. The embodiment uses cement mortar 52 to fill the drilled holes in the road panel 6, thereby completing the non-destructive repair of the road subsidence.

[0038] Repeating the above three steps can complete the non-destructive repair of road subsidence in different areas, thereby meeting the overall deformation repair of roads and factory yards.

[0039] See also Figure 4 , the implementation steps of the present invention are further described.

[0040] S1 marks the hollowed-out and sunken area of ​​the road panel 6. A drilling device 1 is used to drill holes in the hollowed-out and sunken area of ​​the panel surface 6 and a pressure injection pipe 2 is buried.

[0041] S2 inserts the nozzle 41 of the mixing injection device 4 into the injection pipe 2, mixes the two-component foam filler 3 and sprays it into the gap 7 below the panel 6. After mixing, the volume of the filler 3 expands rapidly and continuously lifts the road panel 6 in the limited space 7.

[0042] S3 monitors the lifting of the road panel 6 in real time. When the road panel 6 is lifted to the original elevation, the injection pipe 2 is pulled out, the holes are filled with sealing material 5, and part of the foam squeezed out of the panel surface from the panel seam is cut off to complete the non-destructive repair of the road subsidence in the area.

[0043] Repeat the above three steps S1-S3 to complete the non-destructive repair of road subsidence in different areas.

[0044] The non-destructive method provided by the present invention was used to successfully implement the uneven subsidence repair of the surface layer of all roads and storage yards in the project area of ​​more than 10,000 square meters. Since the original road surface structure was not broken and the roadbed was replaced, a large amount of engineering materials was saved, the workload of road repair construction was greatly reduced, and there was almost no impact on the original road traffic and the use of the storage yard. In addition, the two-component material used in the present invention to fill the gap under the board has early strength and high strength characteristics. After the gap under the board is filled, it can serve as part of the reinforcement of the board surface structure and part of the reinforcement of the roadbed under the board surface structure, which can be said to kill two birds with one stone.

[0045] Embodiments By adopting a non-destructive repair device and method for concrete pavement subsidence provided by the present invention, non-destructive repair of road and yard subsidence in the subsidence area was quickly implemented without affecting road traffic and the use of the original yard. The settlement monitoring data of the road and yard subsidence in the project area six months after the repair showed that the maximum uneven settlement was only 5mm, indicating that the implementation effect of the technology of the present invention is good.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A non-destructive repair device for concrete pavement subsidence, characterized by: The device consists of a drilling device, an injection pipe, a foam filler, a mixed injection device and a sealing material. The drilling device is used for drilling holes in concrete road panels. The injection pipe is buried in the drilled hole and extends under the panel surface. The foam filler is a two-component material. The mixed injection device mixes the two-component materials and sprays them into the gap under the concrete road panel through the injection pipe. After the mixture is sprayed out, the volume expands rapidly and lifts the road panel. Then, the sealing material is used to fill the drilled holes on the flat surface to complete non-destructive repair.

2. The non-destructive repair device for concrete pavement subsidence according to claim 1 is characterized by: The drilling device is used for drilling holes in concrete road panels. The drilling device is used to drill holes in areas where the road surface needs to be repaired for subsidence. The injection pipe is buried in the drill hole and extends under the panel surface.

3. The non-destructive repair device for concrete pavement subsidence according to claim 1 is characterized by: The foam filler is a two-component material of double-spray polyurethane and petroleum-based isocyanate. The two materials expand a hundred times in volume after mixing, reaching a strength of 90% in 15 minutes and a compressive strength of 50MPa after hardening.

4. The non-destructive repair device for concrete pavement subsidence according to claim 1 is characterized by: The mixing and injection device mixes the two-component materials of the foam filler and sprays them into the gap below the concrete road slab through an injection pipe. After being sprayed out, the volume expands rapidly to fill the gap, and the concrete road slab is continuously lifted under the action of the expansion pressure in the limited gap. At the same time, the lifting of the road slab is monitored in real time to prevent excessive or uneven lifting.

5. The non-destructive repair device for concrete pavement subsidence according to claim 1 is characterized by: After the road slab is lifted, the injection pipe is removed and the holes drilled in the slab are filled with sealing materials to complete the non-destructive repair of the road subsidence.

6. A non-destructive repair device for concrete pavement subsidence according to any one of claims 1 to 5, characterized in that: The implementation steps include: marking the hollowing and sinking area of ​​the road panel, drilling holes in the panel surface in the hollowing and sinking area and burying injection pipes; inserting a mixing injection device nozzle into the injection pipe, mixing a two-component foam filler and spraying it into the gap under the panel, and the volume of the filler expands rapidly after mixing and continuously lifts the road panel in a limited space; Monitor the road slab lifting in real time. When the road slab is lifted to its original elevation, remove the injection pipe and use sealing materials to fill the holes to complete the non-destructive repair of the road subsidence in the area.

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