Semi-flexible pavement block closed grouting construction device and method

Abstract

The application discloses a semi-flexible pavement block closed grouting construction device and method, which comprises a closing device, a grouting device and a sweeping device. The grouting area block is divided by the closing device, and the grouting area is controlled. An automatic control system is adopted in the whole process. The grouting amount of grouting material reaching a target grouting rate in the area is calculated by combining field core sampling and indoor test. Under the action of pressure grouting, the grouting rate is ensured, and the grouting construction time is shortened. In order to avoid the accumulation of grouting material, the grouting is carried out in multiple times according to the proportion. After each grouting, the sweeping treatment is automatically carried out. A multi-point laser sensor is used to monitor the road surface structure depth in real time. When the structure depth reaches a threshold value, it is indicated that the grouting effect reaches the requirement. Meanwhile, the residual grouting material on the road surface is avoided, and the road surface anti-skid performance meets the requirement. The whole construction process is simple and portable, and the manpower and material resources are reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a closed grouting construction device and method for semi-flexible road blocks. Background Technology

[0002] In recent years, with the development of the times, my country has faced increasingly serious problems such as vehicle overloading and heavy loads. Coupled with the effects of the greenhouse effect, extreme high temperatures are becoming more frequent and lasting longer, gradually revealing the insufficient load-bearing capacity of asphalt pavements, often resulting in rutting, swelling, and wave-like defects even in the early stages of service. Semi-flexible pavement is a composite material pavement formed by pouring a certain amount of prepared cement-based grout into a high-void (18%–28%) asphalt mixture matrix. Semi-flexible pavement materials possess a certain stress relaxation capacity, and their high-temperature stability and water stability are superior to ordinary asphalt pavements. Furthermore, their fatigue resistance and low-temperature crack resistance are significantly improved compared to ordinary cement concrete pavements. Currently, many cities in my country have adopted semi-flexible pavements for areas with large speed variations and frequent loads, such as intersections, bus stops, and service areas, achieving good results.

[0003] To improve the grouting rate and control the grouting area, CN105332332A proposes a vacuum grouting method that extracts air from the voids within a certain range of asphalt mixture to create a pressure difference, promoting the grouting of cement-based grout. However, the implementation of this equipment is quite demanding, with a small grouting area, high cost, and increased construction complexity. CN109133800B first fills the asphalt mixture into a mold and compacts it, then pours cement-based grout into the voids of the compacted asphalt mixture block, cures it, demolds it to obtain precast blocks, and then fills the joints of several precast blocks with a sealant. This construction method does not solve the problem of the flow state of cement-based grout in the voids, consistent with the problems encountered in actual construction.

[0004] The construction of semi-flexible pavement grouting requires closed construction to prevent the grout from seeping out and affecting the pavement performance. At present, most actual projects use on-site soil and foam adhesive as sealing materials to surround the construction area. However, after grouting, it needs to be cleaned and removed, which is a cumbersome process. For example, CN107304540A and CN107574740A propose surface sealing devices to prevent contamination of adjacent pavement, but they cannot guarantee the free penetration of cement-based grout inside the pavement structure. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a closed-loop grouting construction device and method for semi-flexible pavement blocks. The grouting area is divided into blocks using baffles to control the grouting area. This block division method is suitable for semi-flexible pavement construction in intersection areas. The entire grouting process is automated under a control system. Combined with on-site asphalt mixture core sampling and indoor testing, the amount of grout to achieve the target grouting rate within the area is calculated. Under pressure grouting, a sufficient grouting rate is ensured while shortening the grouting construction time. To avoid grout accumulation, grouting is performed in multiple stages. Multi-point laser sensors monitor the surface texture depth after each grout penetration in real time. When the depth reaches a certain threshold, it indicates complete filling, meeting construction requirements, and eliminating the need for subsequent grout cleaning.

[0006] To achieve the above technical objectives and effects, the present invention is implemented through the following technical solution: a semi-flexible pavement block closed grouting construction device, comprising a sealing device, a grouting device, and a grout sweeping device. The sealing device is a rectangular frame structure, including an internal structure and an upper structure. The grouting device is located above the sealing device. A small grout storage tank is located above the support plate. An inlet is opened above the small grout storage tank. A conveying pipe is connected to the inlet. Several nozzles are evenly and alternately distributed below the support plate. The grout sweeping device is adapted to the sealing device and includes a leveling brush with an inclined angle located below the support. One end of the support is provided with a driving device, and the other end is provided with a sliding device. A first pressure sensor is provided on the conveying pipe. A second pressure sensor is provided inside the small grout storage tank. At least one multi-point laser sensor is located below the grouting device. The first pressure sensor, the second pressure sensor, and the multi-point laser sensor are electrically connected to the control system.

[0007] Furthermore, the built-in structure of the sealing device is a built-in baffle. The base asphalt mixture pavement structure is cut according to the divided grouting area, and the built-in baffle is placed inside the pavement structure.

[0008] Furthermore, the upper structure of the sealing device is a multi-layered rectangular frame structure set above the base asphalt mixture pavement, consisting of an upper baffle, a counterweight plate, and an air-permeable and water-permeable plate from top to bottom.

[0009] Furthermore, the support plate is symmetrically provided with support rods on both sides that are adapted to and connected to the left and right sides of the upper baffle.

[0010] Furthermore, the driving device is a motor, which is connected to a threaded rod. The threaded rod is located above the rear side of the upper baffle, and both ends of the threaded rod are provided with stops.

[0011] Furthermore, the sliding device is a slider, and the slider is adapted to a slide rail via a pulley below it. The slide rail is located on the upper surface of the front side of the upper baffle.

[0012] A construction method for a semi-flexible pavement block closed grouting construction device, characterized by comprising the following steps:

[0013] S1. Under the condition that grouting construction is in place, clean the base asphalt mixture pavement and divide the base asphalt mixture pavement into blocks;

[0014] S2. Cut joints in the base asphalt mixture according to the area of ​​the divided blocks, and install the built-in structure of the sealing device in them;

[0015] S3. Place the upper structure of the sealing device along the upper surface of the base asphalt mixture pavement in the divided area, so that the bottom of the upper structure of the sealing device is fully in contact with the base asphalt mixture.

[0016] S4. After the control system initialization is complete, input the parameters to obtain the infusion volume;

[0017] S5. Connect the conveying pipe to the grout conveying end and convey the grout into the small grout storage tank;

[0018] S6. After the second pressure sensor inside the small slurry storage tank sends a full signal, set up a slurry tank below the nozzle, turn on the pressure pump at the slurry delivery end to pressurize the slurry, and turn off the pressure pump and remove the slurry tank after the slurry is evenly sprayed out from the nozzle.

[0019] S7. Start grouting. The first pressure sensor in the conveying pipe monitors the grout flow rate in real time, and the second pressure sensor inside the small grout storage tank monitors the grout in the tank in real time. The grouting time is determined according to the grouting rate of the nozzle. The grouting time can be controlled to distribute the grouting in multiple times according to the target grouting volume. When the grouting volume reaches the set value of the target grouting volume, the grouting equipment will stop automatically.

[0020] S8. After each grouting in multiple grouting sessions, the leveling brush of the grout sweeping device moves repeatedly across the grouting area to spread the grout fully, promote penetration, and facilitate the next grouting.

[0021] S9. Each time the grout sweeping device is running, when the multi-point laser sensor detects in real time that the texture depth of the base asphalt mixture pavement has reached the specified threshold, the control system controls the grout sweeping device to stop running and ends the grouting process in advance.

[0022] S10. Proceed to the next area for grouting.

[0023] Furthermore, the input parameters in S4 specifically include: the grouting rate of the indoor test specimen, the interconnected porosity of the core sample of the matrix asphalt mixture after paving, the density of the grouting material, the thickness of the matrix asphalt mixture, and the grouting area.

[0024] Furthermore, the specific calculation method for the infusion volume Q in S4 is as follows:

[0025]

[0026] Among them, P r VV represents the perfusion rate in indoor tests. c1 To determine the interconnected porosity of the matrix asphalt mixture after paving, S is the grouting area, H is the thickness of the matrix asphalt mixture, and ρ is the core sample taken from the paved asphalt mixture. g Let f be the density of the grout, and f be the loss rate of the grout.

[0027] Furthermore, in S7, the injection time is determined according to the injection rate of the nozzle. The injection time can be controlled to distribute the injection multiple times according to the target injection volume. When the multi-point laser sensor detects that the structural depth of the matrix asphalt mixture pavement is close to the standard threshold during the injection process, multiple small-volume injections are performed.

[0028] The beneficial effects of this invention are:

[0029] To address the challenge of controlling the grouting rate and area of ​​cement-based grouting materials in conventional grouting equipment, which fails to meet the requirements of semi-flexible pavement grouting construction, this invention presents a block-type grouting construction equipment and process for semi-flexible pavements. Compared to traditional methods, the grouting area is pre-controlled. An internal baffle with a built-in structure seals the pavement structure, and the road surface is sealed by an upper structure with a sealing device, preventing grout leakage. When the grouting area is fixed, the grout is sprayed evenly multiple times according to the calculated grouting volume using a nozzle matrix. Sweeping treatment ensures more thorough penetration, shortens the time to complete grouting, and avoids residual grout on the road surface. This segmentation method is suitable for semi-flexible pavement construction at intersections.

[0030] Traditional slurry sweeping methods require manual operation of equipment. This invention uses an automatic leveling brush that is micro-adhered to the surface of the asphalt mixture, which to a certain extent avoids the damage to the surface of the base asphalt mixture caused by excessive force during manual operation, thus affecting the pavement performance.

[0031] The entire set of equipment is highly automated. The entire grouting and grout sweeping process is comprehensively controlled by the control system. The first pressure sensor collects the flow rate of cement-based grout in the delivery pipe. The grouting is carried out in multiple stages by controlling the injection time of the nozzle matrix. After the grouting is completed, the automatic leveling brush automatically sweeps the grout repeatedly. Multi-point laser sensors monitor the road surface texture depth in real time to ensure that the anti-skid performance meets the requirements while reducing the final grout scraping and sweeping steps. The equipment can be directly removed after construction, which improves the construction efficiency of semi-flexible pavement grouting, saves manpower and material resources, and is simple and portable for construction. Attached Figure Description

[0032] Figure 1A schematic diagram of the overall structure of a semi-flexible pavement block closed grouting construction device;

[0033] Figure 2 A schematic diagram of the upper structure of the sealing device of a semi-flexible pavement block closed grouting construction device;

[0034] Figure 3 This is an enlarged schematic diagram of the upper structure (point A) of a semi-flexible pavement block closed grouting construction device.

[0035] Figure 4 A schematic diagram of a grouting device for a semi-flexible pavement block closed grouting construction device;

[0036] Figure 5 A front view of a grouting device for a semi-flexible pavement block closed grouting construction device;

[0037] Figure 6 A schematic diagram of a grout sweeping device for a semi-flexible pavement block closed grouting construction device;

[0038] Figure 7 A flowchart of a construction method for a semi-flexible pavement block closed grouting construction device;

[0039] Figure 8 A simplified flowchart of the control system for a construction method of a semi-flexible pavement block closed grouting construction device;

[0040] Figure 9 In this embodiment, the control system monitors the flow rate data of the feed pipe in real time.

[0041] The components include: 1. Upper baffle; 2. Counterweight plate; 3. Breathable but waterproof plate; 4. Support plate; 5. Feed inlet; 6. Small slurry storage tank; 7. Nozzle; 8. Support rod; 9. Motor; 10. Bracket; 11. Leveling brush; 12. Slider; 13. Threaded rod; 14. Slide rail; 15. Stop block; 16. Feed pipe; and 17. Internal baffle. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-9 The preferred embodiments of the present invention will be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0043] A semi-flexible pavement block closed grouting construction device and method are disclosed. After the large-void matrix asphalt mixture is laid and cooled to a suitable temperature (below 50°C and in a dry state), the entire grouting area is divided into blocks and surrounded by a closed device. The purpose of this block division is to ensure that the grouting rate of each area meets the requirements, determine the amount of grouting required for each area to achieve the target grouting rate, ensure that the performance of the semi-flexible pavement meets the requirements, and improve the ease of construction.

[0044] The sealing device is a rectangular frame structure, including an inner structure and an upper structure. The inner structure involves cutting joints in the asphalt mixture pavement structure according to the defined grouting area, and then placing the inner baffle inside the pavement structure. Because cement-based grout is highly fluid and prone to settling, it is necessary to prevent the cement-based grout from freely seeping into the asphalt mixture during grouting, thus preventing the grouting rate within the designated area from failing to meet requirements. The inner structure can isolate liquids while meeting the pavement's compressive strength requirements. The dimensions of the inner structure are consistent with the joint area, and the gaps must be filled with sealant to prevent vehicle loads and rainwater erosion from affecting pavement performance.

[0045] The upper structure is a multi-layered rectangular frame structure set above the asphalt mixture pavement. From top to bottom, it consists of an upper baffle 1, a counterweight plate 2, and a breathable but impermeable plate 3. Further, from bottom to top, it consists of a rubber plate, a counterweight plate 2, and a steel plate. If the grouting rate is too fast or the air is not properly vented during grouting, large air bubbles will randomly form near the edges. The purpose of the rubber plate is to directly expel the air bubbles generated at the edges. At the same time, the high elasticity of rubber allows it to fully adhere to the pavement. The counterweight plate 2 is used to fix the baffle, ensuring that the upper structure fully adheres to the asphalt mixture. The upper baffle 1 at the top raises the entire equipment, allowing the grouting equipment and grout sweeping equipment to be installed on it. The nozzle is at a certain height from the pavement surface to ensure sufficient grouting area.

[0046] This equipment uses the equipment for preparing cement-based grout on-site or transporting it remotely as the grout delivery end. The grout is delivered from the outlet of the grout delivery end. The delivery pipe 16 is connected to the inlet 5 of the small grout storage tank 6. Under the action of the pressure pump at the grout delivery end, the grout is pressurized and injected from the nozzle 7, covering the entire area. After the injection is completed, the automatic leveling brush 11 is turned on to sweep the grout and promote the penetration of the grout.

[0047] The purpose of setting up a small grout storage tank 6 is to ensure that the grouting rate of cement-based grouting material is kept at a stable level. A first pressure sensor is set at the material delivery pipe 16 to monitor the grouting material flow rate in real time to see if it is sufficient. At the same time, a second pressure sensor monitors the amount of grout in the storage tank to prevent insufficient grouting rate caused by insufficient grout, delivery delay, etc.

[0048] The small slurry storage tank 6 pressurizes the grout from the nozzles 7 of each matrix under the action of the pressure pump at the slurry delivery end. Under the condition of sufficient slurry, the grouting area and the grouting volume per minute of each nozzle 7 are constant, so that the grouting area just covers the entire closed area. To ensure uniform grouting area, the nozzles 7 are staggered.

[0049] The automatic leveling brush 11 is activated after grouting is completed. Under the action of the motor 9, it moves along the threaded rod 13 and repeatedly sweeps the grout in the grouting area to promote the penetration of cement-based grout. At the same time, the brush slightly covers the surface of the asphalt mixture by 3 to 4 millimeters. Since the surface of the matrix asphalt mixture is uneven in actual engineering, this prevents the brush from damaging the surface of the asphalt mixture under the action of the motor, causing aggregates that are not firmly bonded to the asphalt to fall off and damage the pavement performance.

[0050] To improve grouting efficiency, this invention automates both the grouting and cleaning processes compared to conventional construction equipment. After parameters are input into the control panel, the flow rate of the delivery pipe 16 is monitored in real-time by a first pressure sensor. Within a specified time, the grouting volume within the area is guaranteed to meet requirements. Based on the grouting rate of the nozzle 7, multiple grouting operations can be performed at an appropriate ratio to the target grouting volume by controlling the grouting time. After each grouting operation, automatic cleaning is performed. During this process, a multi-point laser sensor monitors the road surface texture depth in real-time. When the texture depth reaches a threshold, it indicates that the grouting effect has met requirements, while simultaneously preventing excess grout residue on the road surface and ensuring that the road surface's anti-skid performance meets requirements.

[0051] The first pressure sensor is embedded in the material delivery pipe 16 to monitor the flow rate of cement-based grout in real time during construction, keeping it in line with the grouting rate. The flow rate is within a reasonable range to ensure uniform grouting at the nozzle 7 and avoid grout shortage.

[0052] Multi-point laser sensors are installed on grouting equipment. By emitting linear lasers, the multi-point laser sensors can identify the height of each point within a certain area, enabling rapid identification and imaging, thereby obtaining the structural depth of the road surface after grouting.

[0053] The entire grouting and cleaning process is comprehensively controlled by a control system. Parameters such as grouting area, matrix asphalt mixture thickness, grout density, grouting rate from laboratory tests, porosity of grouted specimens, and porosity of core samples taken after grouting are input into the control panel. After obtaining the grouting volume, the grouting volume is monitored in real time by first and second pressure sensors. Within a specified time, the grouting rate within the area is guaranteed to meet requirements. The principle of the entire process is as follows:

[0054] To improve the grouting effect, this invention considers the concept of grouting rate compared to previous grouting equipment. By determining the density of cement-based grout, grouting rate, and porosity of matrix asphalt mixture, it addresses the issue that in actual engineering, the porosity of matrix asphalt mixture varies, and the external environment also affects the flowability of grout, resulting in some loss of grout. Therefore, the loss rate is considered during grouting.

[0055] The dosage of cement-based grouting material is shown in formulas (1) and (2):

[0056]

[0057]

[0058] In the formula: P r —Indoor test perfusion rate, %; VV c1 —The interconnected porosity of the matrix asphalt mixture after paving, measured by core drilling, %; VV c2 —Porosity of the specimen after grouting, %. Q—Cement grout usage, t; S—Grouting area, m² 2 H—Thickness of the matrix asphalt mixture, mm; f—Grouting material loss rate, preferably 10.0%; ρ g —Grouting material density, t / m³ 3 .

[0059] After calculating the required grouting volume, the grouting is carried out in multiple stages according to the proportion. After each grouting, the grouting is swept and the surface texture depth is monitored in real time. The grouting volume ratio is adjusted according to the texture depth specification value to ensure that the grouting material just fills the voids of the asphalt mixture to meet the grouting rate requirements. At the same time, there is no laitance on the surface, so no separate scraping and cleaning treatment is required afterward.

[0060] The construction steps of this invention are as follows:

[0061] A construction method for a semi-flexible pavement block closed grouting construction device, characterized by comprising the following steps:

[0062] S1. Under the condition that grouting construction is in place, clean the base asphalt mixture pavement and divide the base asphalt mixture pavement into blocks;

[0063] S2. Cut the base asphalt mixture according to the area of ​​the divided blocks, and install the built-in structure of the sealing device in it to prevent the cement-based grout from freely seeping along the internal voids of the asphalt mixture.

[0064] S3. Place the upper structure of the sealing device along the upper surface of the base asphalt mixture pavement in the divided area, so that the bottom of the upper structure of the sealing device is fully in contact with the base asphalt mixture to increase the airtightness.

[0065] S4. After the control system initialization is complete, input parameters to obtain the grouting volume and grouting time. Specific input parameters include: grouting rate of indoor test specimens, core sampling connectivity of the asphalt mixture after paving, grout density, asphalt mixture thickness, and grouting area. The specific calculation method for the grouting volume Q is as follows:

[0066]

[0067] Among them, P r VV represents the perfusion rate in indoor tests. c1 To determine the interconnected porosity of the matrix asphalt mixture after paving, S is the grouting area, H is the thickness of the matrix asphalt mixture, and ρ is the core sample taken from the paved asphalt mixture. g Let f be the density of the grout, and f be the grout loss rate.

[0068] S5. Connect the conveying pipe to the grout conveying end and convey the grout into the small grout storage tank;

[0069] S6. After the second pressure sensor inside the small slurry storage tank sends a full signal, set up a slurry tank below the nozzle, turn on the pressure pump at the slurry delivery end to pressurize the slurry, and turn off the pressure pump and remove the slurry tank after the slurry is evenly sprayed out from the nozzle.

[0070] S7. Start grouting. The first pressure sensor in the delivery pipe monitors the grout flow rate in real time, and the second pressure sensor inside the small grout storage tank monitors the grout storage in real time. The grouting time is determined according to the grouting rate of the nozzle. The grouting can be controlled to distribute the target grouting volume proportionally for multiple grouting operations. When the grouting volume reaches the set value of the target grouting volume, the grouting equipment stops automatically. During the grouting process, when the multi-point laser sensor detects that the structural depth of the asphalt mixture pavement is close to the standard threshold, multiple small-volume grouting operations are performed.

[0071] S8. After grouting is completed, the leveling brush of the grout sweeping device moves repeatedly in the grouting area to spread the grout fully and promote penetration.

[0072] S9. When the slurry sweeping device is running, if the multi-point laser sensor detects in real time that the texture depth of the base asphalt mixture pavement is close to the specified threshold, the control system will stop the slurry sweeping device.

[0073] S10. Proceed to the next area for grouting.

[0074] Example 1

[0075] The specific construction steps are as follows:

[0076] 1. Preparation

[0077] After the large-void matrix asphalt mixture is laid, the temperature is lowered to a suitable grouting construction state (below 50℃ and in a dry state). The surface of the asphalt mixture is cleaned, and the asphalt mixture pavement is divided into blocks. Avoid using paint or powder to prevent clogging of the asphalt mixture and the void ratio affecting the grouting rate.

[0078] Cut joints in the base asphalt mixture according to the designated area, insert the built-in baffle 17 and reinforce it with sealant. Place the upper structure of the sealing device along the designated area on the surface of the road to be grouted. The upper baffle 1 used on the road surface is made of steel. Raise the grooving equipment and grouting equipment. To increase the bottom sealing, use counterweight plate 2 to increase the overall mass. If the grooving rate is too fast or the air is not properly vented during grooving, large air bubbles will randomly form near the edge. Set a rubber plate at the bottom to ensure that the rubber is elastic enough to fully adhere to the road surface and allow air to escape.

[0079] After the material is fixed, connect the conveying pipe 16 to the outlet of the grout conveying equipment to deliver the cement-based grout into the small grout storage tank 6. After the grout storage tank is full, set up a grout trough at the bottom, turn on the pressure pump to pressurize the grout, and when the grout is evenly sprayed out from the nozzle 7, turn off the pressure pump and remove the grout trough.

[0080] 2. Grouting construction steps

[0081] After the preparation work is completed, grouting begins. The flow rate of grout is monitored in real time by the first pressure sensor embedded in the delivery pipe 16, and the grout stored in the small storage tank 6 is monitored by the second pressure sensor. According to the grouting rate of the nozzle 7, the grouting equipment automatically stops when the grouting volume reaches the set value. In order to achieve the required grouting rate and anti-skid performance, grouting is performed multiple times at an appropriate ratio of the target grouting volume. After each grouting, the grouting volume is adjusted according to the road surface construction depth to avoid residual grout on the road surface.

[0082] After each grouting, a slurry sweeping process is performed. The grouting equipment is raised by the support rod 8. After grouting is completed, the leveling brush 11, which is installed obliquely on the bracket 10, starts to move repeatedly to level and sweep the slurry under the action of the motor 9. The oblique setting can level the surface more thoroughly. The brush slightly covers the surface of the asphalt mixture by 2-3mm, forming a slurry of a certain thickness on the surface of the base asphalt mixture. Repeated scraping allows the slurry to fully penetrate into the connecting gaps. Since the surface of the base asphalt mixture is uneven in actual engineering, to prevent the brush from damaging the surface of the asphalt mixture under the action of the motor 9, causing aggregates that are not firmly bonded to the asphalt to fall off and damage the pavement performance, the motor 9 moves repeatedly in the grouting area through the threaded rod 13, driving the slider 12 on the other side to move on the slide rail 14. The whole process is driven by the motor 9. There are baffles 15 on both sides to ensure that the slurry is fully spread in the grouting area and promotes penetration.

[0083] Multiple multi-point laser sensors are installed below the small grout storage tank 6 to monitor the road surface texture depth in real time. During the grout sweeping process, when the depth reaches the threshold and stabilizes, it proves that the grouting rate and anti-skid performance meet the requirements, and the grouting construction is stopped in advance, and the equipment is directly removed.

[0084] Example 2

[0085] This example illustrates the actual grouting work performed on a test section before formal construction. It explains the method for controlling the grouting rate, and the control system flow is as follows: Figure 8 As shown.

[0086] This section of road is an intersection area. Based on the intersection area, each lane is divided with a lane width of 3.75m. The grouting area is controlled at 3.75m*11.25m. After paving a 5cm layer of large-void matrix asphalt mixture, core samples are taken and the interconnected void ratio of the asphalt mixture is measured to be 22%. In the indoor test, grouting is carried out by preparing grout that meets the requirements. The interconnected void ratio of the semi-flexible material specimen after grouting is 2.42%. According to formula (1), the grouting rate is calculated to be 89%, which meets the specification requirements.

[0087] The density of the grout is known to be 2.2 t / m³. 3 When specific parameters are input, the control system calculates the injection volume of 3.75m*11.25m as 1t according to formula (2).

[0088] To ensure uniform grouting within the grouting area, two grouting devices are installed on the sealed device, and two conveying pipes are connected to the grouting simultaneously. A first pressure sensor is embedded in the conveying pipe, and four multi-point laser sensors are installed below each grouting device.

[0089] like Figure 9 As shown, the flow rate data of one of the delivery pipes was monitored in real time 200 seconds before grouting began. Combined with the real-time monitoring of the cement-based grout flow rate by the pressure sensor in the delivery pipe, the grouting volume within the grouting area was controlled. Grouting was carried out in proportions of 2 / 3, 4 / 5, and 5 / 6, respectively. Furthermore, the pavement texture depth was monitored in real time during the grout sweeping process after each grouting. The average texture depth at four locations was taken, and the texture depths below the two grouting devices were statistically analyzed as shown in Table 1 below.

[0090] Table 1. Average structural depth beneath the two grouting devices.

[0091]

[0092]

[0093] When the grouting volume reaches 39 / 40, it meets the structural depth requirements in the specification. However, the structural depth is too small after it is fully filled. Therefore, after the formal construction, the grouting volume is 39 / 40 to ensure that the performance of the semi-flexible pavement meets the requirements.

[0094] Any embodiment of the present invention can be used as an independent technical solution or in combination with other embodiments. All patents and publications mentioned in this specification represent publicly available technologies that can be used with the present invention. All patents and publications cited herein are also listed in the references as if each publication were individually referenced. The present invention can be implemented in the absence of any one or more elements, or one or more limitations, which are not specifically stated herein. The terminology and expressions used herein are descriptive methods and are not intended to be limiting, nor is there any intention to exclude any equivalent features from the terms and interpretations described herein; however, it is understood that any suitable changes or modifications can be made within the scope of the invention and the claims. It is understood that the embodiments described herein are embodiments and features in some examples, and any modifications and variations can be made by those skilled in the art based on the spirit of the description, and such modifications and variations are also considered to fall within the scope of the invention and the limitations of the independent and appended claims.

Claims

1. A closed-loop grouting construction device for semi-flexible pavement blocks, characterized in that, The system includes a sealing device, a grouting device, and a grout sweeping device. The sealing device is a rectangular frame structure, including an internal structure and an upper structure. The grouting device is located above the sealing device and includes a support plate. A small grout storage tank is located above the support plate, and an inlet is located above the small grout storage tank. A conveying pipe is connected to the inlet. Several nozzles are evenly and alternately distributed below the support plate. The grout sweeping device is adapted to the sealing device and includes a bracket, a leveling brush with an inclined angle located below the bracket, a driving device at one end of the bracket, and a sliding device at the other end. A first pressure sensor is located on the conveying pipe, a second pressure sensor is located inside the small grout storage tank, and at least one multi-point laser sensor is located below the grouting device. The first pressure sensor, the second pressure sensor, and the multi-point laser sensor are electrically connected to the control system. The enclosed device has an internal baffle. The asphalt mixture pavement structure is cut according to the divided grouting area, and the internal baffle is placed inside the pavement structure. The upper structure of the sealing device is a multi-layered rectangular frame structure set above the asphalt mixture pavement, consisting of an upper baffle, a counterweight plate, and an air-permeable and water-permeable plate from top to bottom.

2. The semi-flexible pavement block closed grouting construction device according to claim 1, characterized in that, The support plate is symmetrically provided with support rods on both sides, which are adapted to and connected to the left and right sides of the upper baffle.

3. The semi-flexible pavement block closed grouting construction device according to claim 1, characterized in that, The driving device is a motor, which is connected to a threaded rod. The threaded rod is located above the rear side of the upper baffle, and both ends of the threaded rod are equipped with stops.

4. The semi-flexible pavement block closed grouting construction device according to claim 1, characterized in that, The sliding device is a slider, and the slider is adapted to the slide rail via pulleys below it. The slide rail is located on the upper surface of the front side of the upper baffle.

5. A construction method for a semi-flexible pavement block closed grouting construction device, applied to the semi-flexible pavement block closed grouting construction device as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Under the condition that grouting construction is in place, clean the base asphalt mixture pavement and divide the base asphalt mixture pavement into blocks; S2. Cut joints in the base asphalt mixture according to the area of ​​the divided blocks, and install the built-in structure of the sealing device in them; S3. Place the upper structure of the sealing device along the upper surface of the base asphalt mixture pavement in the divided area, so that the bottom of the upper structure of the sealing device is fully in contact with the base asphalt mixture. S4. After the control system initialization is complete, input the parameters to obtain the infusion volume; S5. Connect the conveying pipe to the grout conveying end and convey the grout into the small grout storage tank; S6. After the second pressure sensor inside the small slurry storage tank sends a full signal, set up a slurry tank below the nozzle, turn on the pressure pump at the slurry delivery end to pressurize the slurry, and turn off the pressure pump and remove the slurry tank after the slurry is evenly sprayed out from the nozzle. S7. Start grouting. The first pressure sensor in the conveying pipe monitors the grout flow rate in real time, and the second pressure sensor inside the small grout storage tank monitors the grout in the tank in real time. The grouting time is determined according to the grouting rate of the nozzle. The grouting time can be controlled to distribute the grouting in multiple times according to the target grouting volume. When the grouting volume reaches the set value of the target grouting volume, the grouting equipment will stop automatically. S8. After each grouting in multiple grouting sessions, the leveling brush of the grout sweeping device moves repeatedly across the grouting area to spread the grout fully, promote penetration, and facilitate the next grouting. S9. Each time the grout sweeping device is running, when the multi-point laser sensor detects in real time that the texture depth of the base asphalt mixture pavement has reached the specified threshold, the control system controls the grout sweeping device to stop running and ends the grouting process in advance. S10. Proceed to the next area for grouting.

6. The construction method of the semi-flexible pavement block closed grouting construction device according to claim 5, characterized in that, The input parameters in S4 specifically include: the grouting rate of indoor test specimens, the interconnected porosity of core samples of the matrix asphalt mixture after paving, the density of the grouting material, the thickness of the matrix asphalt mixture, and the grouting area.

7. The construction method of the semi-flexible pavement block closed grouting construction device according to claim 5, characterized in that, The specific calculation method for the infusion volume Q in S4 is as follows: ； in, For the infusion rate in the indoor test, The core sample taken after paving of the matrix asphalt mixture shows the interconnectedness and porosity. S represents the grouting area, and H represents the thickness of the matrix asphalt mixture. Let f be the density of the grout, and f be the loss rate of the grout.

8. The construction method of the semi-flexible pavement block closed grouting construction device according to claim 5, characterized in that, In S7, the injection time is determined according to the injection rate of the nozzle. The injection time can be controlled to allocate multiple injections according to the target injection volume. When the multi-point laser sensor detects that the structural depth of the matrix asphalt mixture pavement is close to the standard threshold during the injection process, multiple small injections are performed.

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