Method for reinforcing and raising the ground of an airport runway pavement

Abstract

The present application relates to the technical field of airport runway pavement panel foundation reinforcement lifting, and provides an airport runway pavement panel foundation reinforcement lifting method, comprising: detecting the void settlement of the foundation under each pavement panel of the airport runway; uniformly spacing curtain holes around the edges of the first pavement panel corresponding to the foundation with void settlement; connecting the second pavement panel to the four sides of the first pavement panel respectively, and uniformly spacing curtain holes on the side edge of the second pavement panel connected to the first pavement panel; grouting into the curtain holes to form a support curtain supporting the edges of the first pavement panel and the second pavement panel adjacent to the first pavement panel; drilling vertically downward on the first pavement panel, and performing deep grouting lifting and shallow grouting leveling of the void settlement area and the first pavement panel corresponding thereto according to different drilling depths. The present application precisely detects and accurately reinforces and lifts the pavement panel and the foundation below, effectively improves the construction efficiency, and guarantees the structural strength and service life of the airport runway.

Description

Technical Field

[0001] This invention relates to the field of airport runway slab foundation reinforcement and lifting technology, and in particular to a method for reinforcing and lifting airport runway slab foundations. Background Technology

[0002] With the deepening of domestic infrastructure construction planning, the number of civil airports is gradually increasing, leading to a corresponding increase in the construction and maintenance of their runways. Due to the complex geological conditions of airport runways, the bottom of the pavement structure layer is prone to voiding under the combined effects of the weight of the embankment and the long-term combined load of aircraft overhead, resulting in a certain degree of uneven settlement. Against this backdrop, reinforcing the voided runway foundation during flight intervals can improve the quality of runway use, eliminate potential hazards, and ensure the safe and efficient operation of the airport. Grouting reinforcement technology, due to its advantages of environmental friendliness, fast construction speed, and lightweight equipment, is now widely used in major overhaul projects of airport aprons and runways. However, because the grouting volume is difficult to control, grout overflow or excessive lifting can easily occur, leading to more serious misalignment. Summary of the Invention

[0003] The purpose of this invention is to solve at least one technical problem in the background art and to provide a method for reinforcing and raising the foundation of an airport runway slab.

[0004] To achieve the above objectives, the present invention provides a method for reinforcing and raising the foundation of an airport runway slab, comprising:

[0005] Ultrasonic flaw detection was used to detect the ground settlement under the foundation of each runway panel.

[0006] Curtain holes are evenly spaced around the perimeter of the first panel corresponding to the foundation where void settlement has occurred.

[0007] The first road panel is connected to the second road panel on all four sides, and curtain holes are evenly spaced along the edge of the second road panel that connects to the first road panel.

[0008] Grout is injected into the curtain openings to form a support curtain that supports the first panel and the edge of the second panel adjacent to the first panel;

[0009] Drill holes vertically downwards on the first road surface slab, and perform deep grouting to lift the void settlement area and shallow grouting to level the corresponding first road surface slab according to different drilling depths.

[0010] According to one aspect of the present invention, the method of using ultrasonic flaw detection to detect the ground settlement beneath each runway panel is as follows:

[0011] Coupling agent is applied to the surface of each runway panel, and an ultrasonic probe is used to scan the surface of the panel in an S-shaped trajectory. When the scan reaches a defective area, a pulse waveform is generated on the fluorescent screen connected to the ultrasonic probe and an alarm is issued. At this time, it is determined that there is a void settlement defect in that area.

[0012] According to one aspect of the invention, the curtain opening includes a first curtain opening and a second curtain opening;

[0013] The first curtain holes and the second curtain holes on the first road panel and the second road panel are evenly spaced.

[0014] The first curtain hole on the first road surface is opposite to the second curtain hole on the second road surface, and the second curtain hole on the first road surface is opposite to the first curtain hole on the second road surface.

[0015] According to one aspect of the invention, the injection of grout into the curtain openings to form a support curtain that supports the edge of a first panel and a second panel adjacent to the first panel includes:

[0016] First, grout is injected into the first curtain hole on the first road panel and the second road panel to form the first support curtain;

[0017] Grout is then injected into the second curtain holes on the first road panel and the second road panel to form a second support curtain.

[0018] According to one aspect of the invention, the first support curtain and the second support curtain interlock and overlap to form the support curtain.

[0019] According to one aspect of the present invention, the method of drilling vertically downwards into the first road slab, and performing deep grouting to lift the void settlement area and the corresponding first road slab through shallow grouting to level it according to different drilling depths, includes:

[0020] Drill a hole vertically downwards in the middle of the first panel, down to the deep soil below the void settlement area of ​​the first panel. Then, perform deep grouting and lifting according to the borehole, until the first panel and the surrounding second panels are basically at the same height.

[0021] According to one aspect of the present invention, the method of drilling vertically downwards into the first road surface slab, and performing deep grouting to lift the void settlement area and the corresponding first road surface slab through shallow grouting to level it according to different drilling depths, further includes:

[0022] After the deep grouting and lifting are completed, vertical holes are drilled downwards in the middle part of the first road panel and / or in some uneven parts of the first road panel, to the deep grouting and lifting body. Then, shallow grouting and leveling are carried out according to the drill holes. When the ground void settlement area under the first road panel is filled with grout and / or the first road panel is leveled, the reinforcement and lifting of the road panel foundation is completed.

[0023] According to one aspect of the invention, the borehole depth for deep grouting lifting is d1, the depth of the void settlement zone is d0, and d1 = (10-15)d0.

[0024] According to one aspect of the present invention, the scanning surface of the ultrasonic probe is set in a strip-shaped rectangle, and then slides to scan the ground in an S-shaped trajectory. This configuration allows the probe scanning area to uniformly cover the entire area of ​​the road panel, enabling better detection of the location of road panel voids and settlements, and preventing missed detection of defects.

[0025] According to one aspect of the present invention, by arranging a support curtain, the road slab can be better supported, the strength of the road slab joints can be improved, and the mid-span bending moment of the road slab can be reduced, thereby enabling it to resist greater aircraft wheel loads. At the same time, the support curtain enhances the connection and integrity between road slabs, avoiding defects such as slab misalignment caused by secondary settlement of the foundation after reinforcement and lifting. In addition, arranging the support curtain can also prevent the grout from spreading randomly during grouting and lifting, and play a certain role in restraining the diffusion of the grout. At the same time, it prevents rainwater from seeping into the underlying strata through the gaps between the slabs after rain, thereby avoiding further damage to the underlying strata of the road slab.

[0026] According to one aspect of the present invention, grouting is injected into the curtain holes to form a support curtain that supports the edge of a first runway panel and a second runway panel adjacent to the first runway panel. This includes: firstly, injecting grout into the first curtain holes on the first and second runway panels to form a first support curtain; then, injecting grout into the second curtain holes on the first and second runway panels to form a second support curtain. This arrangement allows for grouting to be completed using a skip-hole method across the runway panels. This not only ensures effective reinforcement and support around the area of ​​the first runway panel where detachment and settlement occur, preventing collapse, damage, or deformation during construction due to various factors, but also ensures uniform stress on the first runway panel during the formation of the support curtain. This facilitates adjustments based on grouting and support conditions, ensuring the first runway panel remains level after the support curtain is formed, guaranteeing the quality of subsequent reinforcement and lifting, and ensuring the flatness of the airport runway.

[0027] Furthermore, the aforementioned method of forming a support curtain can effectively control the flow and filling of the grout, ensuring that the grout can be evenly filled into the foundation, preventing the grout from flowing out of the slab joints, improving the grouting effect and construction quality, and thus forming a solid support curtain.

[0028] High-strength grout with water-stopping properties is used during the grouting of the bearing curtain. This gives the bearing curtain higher strength, enabling it to better support the pavement slab and its upper impact loads, while also preventing water from seeping into the strata through the gaps between the slabs, thus avoiding further damage to the strata.

[0029] According to the present invention, the present invention utilizes the principle of ultrasonic flaw detection to determine the location and size of voids in the soil layer. This method has a wide detection range, high sensitivity, fast speed, low cost, and is harmless to the human body, enabling accurate location and quantification of void defects.

[0030] This invention employs a support curtain at the junction of road panels, which better supports the road panels, improves the strength of the joints between the road panel slabs, and reduces the mid-span bending moment of the road panels, thus enabling them to withstand greater aircraft wheel loads. Simultaneously, the support curtain enhances the connection and integrity between the slabs, preventing defects such as edge misalignment caused by secondary settlement of the foundation after reinforcement and lifting. Furthermore, the support curtain prevents the grout from spreading during grouting and lifting, thus restraining its diffusion. It also prevents rainwater from seeping into the underlying strata through the gaps between the slabs after rain, thereby avoiding further damage to the strata beneath the road panels.

[0031] This invention uses a depth d1 for deep grouting and lifting, which prevents the grout from being squeezed out of the road slab joints due to excessive grouting pressure when the grouting lifting depth is too shallow, or prevents the slab from cracking or misaligning due to excessive lifting.

[0032] This invention uses shallow grouting to level uneven areas. Small-diameter holes are drilled and grout is injected into the uneven areas. The solidification rate and pressure of the grout are controlled, which allows for more precise leveling of the road surface and avoids the risks of excessive lifting and grout overflow. Attached Figure Description

[0033] Figure 1 A flowchart illustrating a method for reinforcing and raising the foundation of an airport runway slab according to an embodiment of the present invention;

[0034] Figure 2 This diagram schematically illustrates a road surface detachment settlement detection diagram according to one embodiment of the present invention.

[0035] Figure 3 This diagram illustrates the sliding trajectory of an ultrasonic probe according to one embodiment of the present invention.

[0036] Figure 4 This diagram illustrates an intermittent grouting method using a skip-hole technique according to an embodiment of the present invention.

[0037] Figure 5A schematic cross-sectional view of a road panel and support curtain according to an embodiment of the present invention;

[0038] Figure 6 A schematic perspective view of a road panel and support curtain according to an embodiment of the present invention;

[0039] Figure 7 A schematic diagram illustrating the road slab foundation voiding according to one embodiment of the present invention;

[0040] Figure 8 This diagram schematically illustrates a deep grouting lift according to one embodiment of the present invention.

[0041] Figure 9 This diagram schematically illustrates a shallow grouting leveling process according to one embodiment of the present invention. Detailed Implementation

[0042] The invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.

[0043] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0044] Figure 1 A flowchart illustrating a method for reinforcing and raising the foundation of an airport runway slab according to an embodiment of the present invention is shown. Figure 1 As shown, in this embodiment, the method for reinforcing and raising the foundation of the airport runway slab includes:

[0045] Ultrasonic flaw detection was used to detect the ground settlement under the foundation of each runway panel.

[0046] Curtain holes extending into the silty mudstone are evenly spaced around the perimeter of the first road panel corresponding to the foundation where void settlement occurs.

[0047] The first panel is connected to the second panel on all four sides. Curtain holes that extend into the silty mudstone are evenly spaced along the edge of the second panel that connects to the first panel.

[0048] Grout is injected into the curtain openings to form a support curtain that supports the first panel and the edge of the second panel adjacent to the first panel;

[0049] Vertical holes were drilled into the first road surface slab. Depending on the drilling depth, deep grouting was performed to lift the void settlement area and shallow grouting to level the first road surface slab corresponding to the void settlement area.

[0050] It should be noted that, in one scenario, an airport runway is formed by splicing together several pavement slabs. These slabs are typically reinforced concrete, acting as bending members. When the pavement slab becomes detached from the underlying foundation soil, the detached portion will be subjected to bending. If the detachment is in the middle of the slab span, the slab will bend in the middle, potentially leading to cracking and settlement if not addressed promptly. If the detachment is at the end of the slab, the end will bend, resulting in issues such as misalignment and settlement. This invention addresses the problem of detachment and settlement of the pavement slab and the underlying foundation by proposing the aforementioned method for reinforcing and raising the foundation of airport runway pavement slabs. This method allows for precise detection and accurate reinforcement and raising of the foundation, effectively improving construction efficiency and ensuring the structural strength and service life of the airport runway.

[0051] Furthermore, according to one embodiment of the present invention, ultrasonic flaw detection is used to detect the ground settlement beneath each runway panel as follows:

[0052] Coupling agent is applied to the surface of each runway panel, and an ultrasonic probe is used to scan the surface of the panel in an S-shaped trajectory. When the scan reaches a defective area, a pulse waveform is generated on the fluorescent screen connected to the ultrasonic probe and an alarm is issued. At this time, it is determined that there is a void settlement defect in that area.

[0053] Specifically, such as Figure 2 and Figure 3 As shown, in this embodiment, the ultrasonic flaw detection principle is used to detect the void settlement of the foundation 9 below the road panel 1. When the ultrasonic beam enters the soil from the top surface of the road panel, it generates reflected waves when it encounters the top and bottom surfaces of the voided soil area, forming pulse waveforms on the fluorescent screen 3. The location and size of the voided soil area are determined based on these pulse waveforms. For example, nine road panels are selected, a coupling agent is applied to the surface of the nine road panels, and an ultrasonic probe 2 is used to scan and slide along the surface of the road panel in an S-shaped trajectory. When a defect is detected, a pulse waveform appears on the fluorescent screen 3 and an alarm is issued, indicating that there is a void defect at this location.

[0054] In this embodiment, the ultrasonic probe scanning surface is set in a strip-shaped rectangle, and then slides to scan the ground in an S-shaped trajectory. This setting allows the probe scanning area to uniformly cover the entire area of ​​the road panel, enabling better detection of road panel voids and settlement locations and preventing missed detections of defects.

[0055] Furthermore, according to one embodiment of the present invention, the curtain opening includes a first curtain opening and a second curtain opening;

[0056] The first curtain holes and the second curtain holes on the first road panel and the second road panel are evenly spaced.

[0057] The first curtain hole on the first road surface is opposite to the second curtain hole on the second road surface, and the second curtain hole on the first road surface is opposite to the first curtain hole on the second road surface.

[0058] Specifically, such as Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, vertical holes are drilled downwards on the outer ring of the road panel (i.e., the first road panel 4) in the settlement and void area (including the four edges of the first road panel 4 and one side edge of the second road panel 5 connected to the four edges of the first road panel 4). The road panel is 5m*5m in size, and three curtain holes are arranged on each edge of the panel, forming multiple spaced curtain holes. The bottom of the curtain holes extends into the silty mudstone 10. Grouting is performed in the curtain holes using a cross-panel skip-hole method. That is, the first curtain holes 6 on the first road panel 4 and the second road panel 5 are grouted first. After all the first curtain holes 6 are grouted, the second curtain holes 7 are grouted. The grouting ranges of two adjacent curtain holes (i.e., the first curtain holes 6 and the second curtain holes 7 that are adjacent in the horizontal and vertical directions, respectively) interlock and overlap to form an interlocking and overlapping support curtain 8 for the road panel.

[0059] In this embodiment, by arranging the support curtain, the pavement slab can be better supported, the strength of the pavement slab splicing joints can be improved, the mid-span bending moment of the pavement slab can be reduced, and thus it can resist greater aircraft wheel loads. At the same time, the support curtain enhances the connection and integrity between pavement slabs, avoiding defects such as slab edge misalignment caused by secondary settlement of the foundation after reinforcement and lifting. In addition, the arrangement of the support curtain can also prevent the grout from spreading randomly during grouting and lifting, and play a certain role in restraining the diffusion of grout. At the same time, it prevents rainwater from seeping into the underlying strata through the gaps between the slabs after rain, thereby avoiding further damage to the underlying strata of the pavement slab.

[0060] It should be noted that, Figure 4 and Figure 6 The diagrams illustrate two drilling and grouting scenarios: one where a single road panel and its underlying foundation experience void settlement, and the other where all road panels and their underlying foundations experience void settlement. Figure 4 As shown, when a single pavement panel experiences detachment and settlement, grouting can be injected by drilling holes on both sides of the joint connecting the first pavement panel and the surrounding second pavement panels. For example... Figure 6 As shown, when all road panels and the foundation below them experience void settlement, grouting is injected into both sides of the splice joint between each road panel. At this time, each road panel is the first road panel 4 mentioned above.

[0061] Furthermore, such as Figure 4As shown, according to one embodiment of the present invention, grout is injected into the curtain openings to form a support curtain that supports the edge of the first panel 4 and the edge of the second panel 5 adjacent to the first panel 4, comprising:

[0062] First, grout is injected into the first curtain hole 6 on the first panel 4 and the second panel 5 to form the first support curtain.

[0063] Grout is then injected into the second curtain holes 7 on the first panel 4 and the second panel 5 to form the second support curtain. This arrangement allows for intermittent grouting using a skip-hole method across panels. This not only ensures effective reinforcement and support around the area of ​​the first panel 4 where detachment settlement occurs, preventing collapse, damage, or deformation during construction due to various factors, but also ensures uniform stress distribution on the first panel 4 during the formation of the support curtain. This facilitates adjustments based on grouting and support conditions, ensuring the first panel 4 remains level after the support curtain is formed, guaranteeing the quality of subsequent reinforcement and lifting, and maintaining the flatness of the airport runway.

[0064] Furthermore, the aforementioned method of forming a support curtain can effectively control the flow and filling of the grout, ensuring that the grout can be evenly filled into the foundation, preventing the grout from flowing out of the slab joints, improving the grouting effect and construction quality, and thus forming a solid support curtain.

[0065] In this embodiment, a high-strength grout with water-stopping properties is used during the grouting of the support curtain. This gives the support curtain higher strength, enabling it to better support the pavement slab and its upper impact loads, while also preventing water from seeping into the strata through the gaps between the slabs, thus avoiding further damage to the strata.

[0066] It is worth noting that, based on the sequential grouting through the first curtain hole 6 and the second curtain hole 7, the actual grouting can be carried out in a regular manner, such as clockwise or counterclockwise, or in an irregular manner depending on the actual situation, as long as it can ensure that the area of ​​the first panel 4 that experiences void settlement after grouting remains horizontal and is stably and reliably supported.

[0067] Furthermore, such as Figure 6 As shown, the first and second support curtains interlock and overlap to form support curtain 8. That is, support curtain 8 consists of two parts. Support curtain 8 simultaneously supports the area of ​​the first road panel 4 that has experienced void settlement and the adjacent first road panel (i.e., the first road panel when the adjacent road panel also experiences void settlement) or the second road panel (i.e., the second road panel when the adjacent road panel does not experience void settlement). This ensures that the first road panel 4 and its surroundings have stable support, ensuring that secondary settlement will not occur during construction or subsequent use, and ensuring the quality of reinforcement and lifting.

[0068] Furthermore, according to one embodiment of the present invention, vertically downward holes are drilled in the first road surface slab, and deep grouting and lifting and shallow grouting and leveling of the void settlement area and the first road slab corresponding to the void settlement area are carried out according to different drilling depths, including:

[0069] Drill a hole vertically downwards in the middle of the first panel, down to the deep soil below the void settlement area of ​​the first panel. Then, perform deep grouting and lifting according to the borehole, until the first panel and the surrounding second panels are basically at the same height.

[0070] Furthermore, according to one embodiment of the present invention, vertically downward holes are drilled in the first road surface slab, and deep grouting and lifting and shallow grouting and leveling of the void settlement area and the first road slab corresponding to the void settlement area are carried out according to different drilling depths, further comprising:

[0071] After the deep grouting and lifting are completed, vertical holes are drilled downwards in the middle part of the first road panel and / or in some uneven parts of the first road panel, to the deep grouting and lifting body. Then, shallow grouting and leveling are carried out according to the drill holes. When the ground void settlement area under the first road panel is filled with grout and / or the first road panel is leveled, the reinforcement and lifting of the road panel foundation is completed.

[0072] In this embodiment, the borehole depth for deep grouting and lifting is d1, and the depth of the vacuolation settlement zone 11 is d0, where d1 = (10-15)d0.

[0073] Specifically, such as Figure 7 and Figure 8 As shown, in this embodiment, a vertical hole 12 is drilled downwards in the middle of the road panel in the settlement void area to a certain depth d1 below the settlement void range of the road panel, where d1 = (10-15)d0. Then, pressure grouting is performed at the bottom of the lifting hole. The injected grout seeps into the surrounding soil and solidifies quickly. As the grout is continuously injected, the surrounding soil is filled and squeezed, thereby forming an upward lifting force that pushes the lower soil layer of the void road panel upwards, thereby lifting the road panel to a certain height.

[0074] By setting a depth d1, it is possible to prevent excessive grouting pressure when the grouting depth is too shallow, which could cause grout to be squeezed out from the joints of the road slab, or excessive lifting amount, which could cause slab cracking or misalignment.

[0075] In this embodiment, pressure grouting to the bottom of the lifting hole is performed using an integrated drilling and grouting machine, with segmented, backward grouting lifting. This design prevents the grout from splitting the foundation and forming grout leakage channels due to continuous grouting at the same point or increased grouting pressure. Multiple backward grouting operations allow the grout to apply more even pressure to the surrounding soil, resulting in a more uniform lifting.

[0076] Furthermore, such as Figure 9 As shown in this embodiment, after deep grouting and lifting, the road slab foundation may be uneven in some areas or at the corners. Therefore, shallow grouting is required for leveling. During shallow grouting, small-diameter holes 13 are drilled in the uneven areas and grout is injected. The solidification rate and pressure of the grout are controlled to more precisely level the road slab and avoid the risk of excessive lifting and grout overflow. After shallow grouting and leveling, the reinforcement and lifting of the airport runway road slab foundation is completed.

[0077] According to the above-described scheme of the present invention, the present invention utilizes the principle of ultrasonic flaw detection to determine the location and size of voids in the soil layer. This method has a wide detection range, high sensitivity, fast speed, low cost, and is harmless to the human body, enabling accurate location and quantification of void defects.

[0078] This invention employs a support curtain at the junction of road panels, which better supports the road panels, improves the strength of the joints between the road panel slabs, and reduces the mid-span bending moment of the road panels, thus enabling them to withstand greater aircraft wheel loads. Simultaneously, the support curtain enhances the connection and integrity between the slabs, preventing defects such as edge misalignment caused by secondary settlement of the foundation after reinforcement and lifting. Furthermore, the support curtain prevents the grout from spreading during grouting and lifting, thus restraining its diffusion. It also prevents rainwater from seeping into the underlying strata through the gaps between the slabs after rain, thereby avoiding further damage to the strata beneath the road panels.

[0079] This invention uses a depth d1 for deep grouting and lifting, which prevents the grout from being squeezed out of the road slab joints due to excessive grouting pressure when the grouting lifting depth is too shallow, or prevents the slab from cracking or misaligning due to excessive lifting.

[0080] This invention uses shallow grouting to level uneven areas. Small-diameter holes are drilled and grout is injected into the uneven areas. The solidification rate and pressure of the grout are controlled, which allows for more precise leveling of the road surface and avoids the risks of excessive lifting and grout overflow.

[0081] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for reinforcing and raising the foundation of an airport runway slab, characterized in that, include: Ultrasonic flaw detection was used to detect the ground settlement under the foundation of each runway panel. Curtain holes are evenly spaced around the perimeter of the first panel corresponding to the foundation where void settlement has occurred. The first road panel is connected to the second road panel on all four sides, and curtain holes are evenly spaced along the edge of the second road panel that connects to the first road panel. Grout is injected into the curtain openings to form a support curtain that supports the first panel and the edge of the second panel adjacent to the first panel; Drill holes vertically downwards on the first road surface slab, and perform deep grouting to lift the void settlement area and shallow grouting to level the corresponding first road surface slab according to different drilling depths; The process involves drilling vertically downwards into the first road slab, and performing deep grouting to lift the void settlement area and shallow grouting to level the corresponding first road slab, depending on the drilling depth. Drill a hole vertically downward in the middle of the first panel, down to the deep soil below the void settlement area below the first panel. Then, perform deep grouting and lifting according to the borehole, until the first panel and the surrounding second panels are basically at the same height. The process of drilling vertically downwards into the first road slab, and performing deep grouting to lift the void settlement area and shallow grouting to level the corresponding first road slab according to different drilling depths, also includes: After the deep grouting and lifting are completed, vertical holes are drilled downwards in the middle part of the first road panel and / or in some uneven parts of the first road panel, to the deep grouting and lifting body. Then, shallow grouting and leveling are carried out according to the drill holes. When the grouting body is filled in the void settlement area of ​​the foundation under the first road panel and / or the first road panel is leveled, the reinforcement and lifting of the road panel foundation is completed. The borehole depth used for deep grouting and lifting is d1, and the depth of the void settlement zone is d0, where d1 = (10-15)d0.

2. The method for reinforcing and raising the foundation of an airport runway slab according to claim 1, characterized in that, The method of using ultrasonic flaw detection to detect the ground settlement beneath the various runway deck panels is as follows: Coupling agent is applied to the surface of each runway panel, and an ultrasonic probe is used to scan the surface of the runway panel in an S-shaped trajectory. When the scan reaches a defective area, a pulse waveform is generated on the fluorescent screen connected to the ultrasonic probe and an alarm is issued. At this time, it is determined that there is a void settlement defect in that area.

3. The method for reinforcing and raising the foundation of an airport runway slab according to claim 1, characterized in that, The curtain opening includes a first curtain opening and a second curtain opening; The first curtain holes and the second curtain holes on the first road panel and the second road panel are evenly spaced. The first curtain hole on the first road surface is opposite to the second curtain hole on the second road surface, and the second curtain hole on the first road surface is opposite to the first curtain hole on the second road surface.

4. The method for reinforcing and raising the foundation of an airport runway slab according to claim 3, characterized in that, The process of injecting grout into the curtain openings to form a support curtain that supports the first panel and the edge of the second panel adjacent to the first panel includes: First, grout is injected into the first curtain hole on the first road panel and the second road panel to form the first support curtain; Grout is then injected into the second curtain holes on the first road panel and the second road panel to form a second support curtain.

5. The method for reinforcing and raising the foundation of an airport runway slab according to claim 4, characterized in that, The first support curtain and the second support curtain interlock and overlap to form the support curtain.

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