Stable high-water-content sludge roadbed filling construction device and method

Abstract

The invention discloses a stable high-water-content sludge roadbed filling construction device and method. According to the device, a movable frame serves as a carrier, a foam manufacturing and conveying device, a high-water-content sludge storage and conveying device and a cement mixing and conveying device are integrated, and foam, cement paste and sludge are supplied to a mixing tank of a vehicle-mounted stirring device through respective independent pipelines; the stirring device adopts a low-speed multi-blade impeller to carry out low-shear mixing so as to protect a foam structure, the mixture is uniformly sprayed on a roadbed by the spraying device, and then the mixture is leveled by the height-adjustable transverse slicking device. The method comprises the steps of device in-place, foam preparation, sludge and cement paste conveying, low-speed mixing, spraying, scraping and the like. Compared with the prior art, on-site integrated and continuous construction is achieved, the foam structure can be effectively protected, the material proportion and the construction rhythm can be accurately controlled, the construction efficiency, the engineering quality and the high-water-content sludge resource utilization rate are improved, and the energy-saving, environment-friendly and engineering popularization value is remarkable.

Description

Technical Field

[0001] This invention relates to the field of roadbed construction equipment technology, specifically to a construction device and method for filling roadbeds with stable high-water-content silt. Background Technology

[0002] Using high-moisture silt for roadbed filling can save costs and reduce the burden of transportation and disposal. However, the high water content and varied composition of silt make it prone to problems such as low strength, poor shear resistance, and difficulty in controlling settlement and fluidity when used directly. Traditional dry hardening modification with large amounts of cement or lime requires pretreatment, is energy-intensive, and makes it difficult to achieve construction continuity. Foamed concrete, which combines stable foam with silt and cement paste, can reduce its self-weight and improve its structure and performance. However, its field application faces key challenges such as the foam's susceptibility to breakage under high shear, the sensitivity of foam stability and density to mechanical properties, and fluctuations in material properties due to unstable proportioning and transportation.

[0003] Therefore, there is an urgent need in engineering for a highly integrated mobile construction device and method that can achieve foam preparation and pressurized transportation, storage and pressurization of high-moisture sludge with a mixer, and mixing and pumping of cement slurry on the same mobile frame, while protecting the foam structure through low-shear mixing by a low-speed multi-blade impeller. Each system should use independent pipelines, valves, and metering devices to precisely control the supply rate, and cooperate with uniform spraying and adjustable leveling to achieve continuous construction along the roadbed direction, thereby improving construction uniformity, ensuring material performance, and enhancing on-site adaptability and construction efficiency. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a stable high-water-content silt roadbed filling construction device and method, which realizes continuous operation on the construction site and has the advantages of rapid filling, energy saving and emission reduction and construction process integration, so as to solve the problems mentioned in the background art; another purpose of this invention is to provide a stable high-water-content silt roadbed filling construction method.

[0005] Technical Solution: The stable high-moisture silt roadbed filling construction device and method of the present invention includes a mobile frame, and a cement mixing and conveying device, a high-moisture silt storage and conveying device, and a foam making and conveying device installed on the mobile frame. The cement mixing and conveying device, the high-moisture silt storage and conveying device, and the foam making and conveying device are respectively connected to a mixing device installed on the mobile frame through independent conveying pipelines, for supplying cement, silt, and foam to the mixing device respectively. The mixing device includes an impeller structure installed in a mixing tank for fully mixing the cement, silt, and foam and protecting the foam structure. A spraying device is installed on the mobile frame and connected to the discharge port of the mixing device for uniformly spraying the mixed mixture onto the roadbed. A leveling device is installed at the rear of the mobile frame for leveling the sprayed mixture.

[0006] The mixing device is equipped with a mixing tank and a multi-bladed impeller. The impeller rotates at low speed within the tank, thoroughly mixing the three components while maintaining the foam structure. After mixing, the device uses a spraying device to evenly spray the mixture through nozzles onto the roadbed to be filled. Subsequently, a leveling device is installed at the rear of the vehicle frame. This device includes a height-adjustable transverse scraper, which is mechanically driven to push along the road surface, slightly compacting and smoothing the sprayed mixture, resulting in a smooth and dense road surface.

[0007] Furthermore, based on the stable high-water-content silt roadbed filling construction device, the mobile frame includes a trailer connected to the vehicle, and adopts a tire-type chassis structure to adapt to different terrains and achieve continuous mobile construction along the road.

[0008] Furthermore, the foam production and conveying device includes a foaming machine, a high-pressure pumping equipment and corresponding pipelines, used to generate stable foam with a density of about 48~52 kg / m³ and pressurize and convey it to the mixing device.

[0009] Furthermore, the high water content sludge storage and conveying device is characterized by comprising a high water content sludge storage tank with a stirrer and a high pressure pumping device for pressurizing and conveying the high water content sludge to the stirring device.

[0010] Furthermore, the cement mixing and conveying device is characterized in that it includes a cement mixing silo, a spiral mixing device, and a high-pressure pumping device, used to pressurize and convey the mixed cement to the mixing device.

[0011] Furthermore, the foam production and conveying device, the high water content sludge storage and conveying device, and the cement mixing and conveying device are all connected to the feed inlet of the mixing device through independent pipelines, and the supply rate is controlled by valves or metering devices to achieve precise proportional adjustment.

[0012] Furthermore, the mixing device is equipped with an impeller structure, which is a multi-bladed low-speed impeller. The mixing device adopts a low-speed multi-bladed impeller structure and is driven by a low-speed motor to achieve slow and uniform mixing of three-phase (cement slurry, sludge slurry and foam) materials, avoiding excessive foam breakage.

[0013] Furthermore, the mixing device also includes a control system for controlling the flow rate of each material and the mixing time to maintain the optimal ratio of the mixture and the construction rhythm.

[0014] Furthermore, the spraying device is characterized in that it includes a spray pipe disposed at the rear end of the vehicle frame for uniformly spraying the mixture onto the roadbed; the leveling device includes a transverse metal scraper connected to a hydraulic telescopic rod, which is connected to a rolling shaft rotation device; the height of the scraper is adjustable to adapt to different fill layer thickness requirements. Surface leveling is achieved by mechanically driving the scraper forward along the road surface.

[0015] On the other hand, the present invention provides a stable high-water-content silt roadbed filling construction device and method, comprising the following steps:

[0016] (1) Start the mobile frame and position it on one side of the roadbed to be filled;

[0017] (2) Start the foam making and conveying device, inject the foaming agent into the foam foaming device in a certain proportion to obtain foaming liquid, and use the air compression equipment in the foam foaming device to form bubbles with stable density; connect to the feed port of the stirring device through the pipeline, and control the supply rate through the valve or metering device.

[0018] (3) Start the high water content sludge storage and conveying device, add the high water content sludge to the storage tank, and connect it to the feed port of the mixing device through the pipeline. The supply rate can be controlled by the valve or metering device.

[0019] (4) Start the cement mixing and conveying device, add cement and water to the mixing system, and premix the cement slurry through the spiral mixing device. The slurry is independently connected to the feed port of the mixing device through a pipeline, and the supply rate can be controlled by a valve or metering device.

[0020] (5) Start the mixing device. The impeller rotates at low speed in the mixing tank to fully mix the cement, high water content sludge and foam transported by the pipeline, and keep the foam structure intact.

[0021] (6) After mixing, the spraying device sprays the mixture evenly onto the roadbed to be filled through the nozzle. Then, the leveling device is started. The leveling device includes a horizontal scraper with adjustable height. It is driven by a mechanical drive to push along the road surface to smooth the surface of the sprayed mixture, so that the road surface is flat.

[0022] Furthermore, the foam delivery pipe is located in the middle of the mixing device, which facilitates uniform mixing with cement and high-moisture sludge.

[0023] Furthermore, the leveling device is hidden inside the mobile frame when not in use, and extends and retracts when in use.

[0024] Beneficial effects: This invention provides a stable high-water-content silt roadbed filling construction device and method, which has the following significant advantages:

[0025] 1. The vehicle-mounted device of the present invention can work directly on the roadbed filling site, and cement, silt and foam are continuously supplied and mixed and sprayed in real time through the above-mentioned equipment.

[0026] 2. The independent metering pipeline and control system of the vehicle-mounted device of this invention ensures accurate material supply, and the flow rate and rhythm can be automatically adjusted during the construction process.

[0027] 3. The modular assembly and leveling device of the vehicle-mounted device of the present invention has a retractable structure, which facilitates equipment relocation and daily maintenance. Attached Figure Description

[0028] Figure 1 This is a front view of the high water content silt stabilized roadbed filling construction device described in this invention;

[0029] Figure 2 This is a diagram of the foam production and conveying device described in this invention;

[0030] Figure 3 This is a diagram of the high water content sludge storage and conveying device described in this invention;

[0031] Figure 4 This is a diagram of the cement mixing and conveying device described in this invention;

[0032] Figure 5 This is a diagram of the stirring device described in this invention;

[0033] Figure 6 This is a diagram of the spraying device described in this invention;

[0034] Figure 7 This is a diagram of the scraping device described in this invention;

[0035] Figure 8 This is a cross-sectional view of the leveling device described in this invention.

[0036] The above-mentioned attached drawings include the following reference numerals: 1. Mobile frame; 2. Foam production and conveying device; 21. Conveying pipeline; 22. Foaming machine; 23. First high-pressure pumping equipment; 3. High water content sludge storage and conveying device; 31. Agitator; 32. Second high-pressure pumping equipment; 4. Cement mixing and conveying device; 41. Spiral agitator; 42. Third high-pressure pumping equipment; 5. Mixing device; 51. Conveying pipeline; 52. Low-speed impeller equipment; 53. Foam conveying equipment; 54. Valve device; 6. Spraying device; 7. Scraping device; 71. Hydraulic telescopic rod; 72. Rolling shaft rotating equipment; 73. Scraper. Detailed Implementation

[0037] like Figure 1As shown in the figure, this invention provides a construction device for stabilizing high-moisture-content silt roadbed filling, including a mobile frame 1, a foam production and conveying device 2, a high-moisture-content silt storage and conveying device 3, a cement mixing and conveying device 4, a mixing device 5, a spraying device 6, and a leveling device 7. The foam production and conveying device 2, the high-moisture-content silt storage and conveying device 3, the cement mixing and conveying device 4, and the mixing device 5 are mounted on the mobile frame 1. The cement mixing and conveying device 4, the high-moisture-content silt storage and conveying device 3, and the foam production and conveying device 2 are each connected to the mixing device 5 mounted on the mobile frame via independent conveying pipelines, for supplying cement, silt, and foam to the mixing tank of the mixing device, respectively. The spraying device 6 is mounted on the mobile frame and connected to the discharge port of the mixing device, for uniformly spraying the mixed mixture onto the roadbed. The leveling device 7 is installed at the rear of the mobile frame for leveling the sprayed mixture.

[0038] like Figure 2 As shown, in one embodiment, the foam production and conveying device 2 includes a foam storage tank, a conveying pipe 21 is provided at the top of the foam storage tank, the conveying pipe 21 is connected to a foaming machine 22, and a first high-pressure pumping device 23 is provided at the bottom of the foam storage tank; the foaming agent enters the foaming machine 22 through the conveying pipe 21, the air compression device in the foaming machine 22 operates and generates foam, the generated foam is stored in the foam storage tank, and flows out through the first high-pressure pumping device 23.

[0039] like Figure 3 As shown, in one embodiment, the high water content sludge storage and conveying device 3 includes a high water content sludge storage tank, a stirrer 31 inside the high water content sludge storage tank, and a second high pressure pumping device 32 at the bottom of the high water content sludge storage tank; the high water content sludge is stored in the high water content sludge storage tank, stirred by the stirrer 31, and then flows out through the second high pressure pumping device 32.

[0040] like Figure 4 As shown, in one embodiment, the cement mixing and conveying device 4 includes a cement storage tank, a spiral mixer 41, and a third high-pressure pumping device 42. The spiral mixer 41 is installed inside the cement storage tank, and the third high-pressure pumping device 42 is installed at the bottom of the cement storage tank. Cement is stored in the cement storage tank, stirred by the spiral mixer 41, and then flows out through the third high-pressure pumping device 42.

[0041] like Figure 5As shown, in one embodiment, the mixing device 5 includes a mixing tank, a conveying pipe 51, a low-speed impeller device 52, a foam conveying device 53, and a valve device 54. The conveying pipe 51 is located at the top of the mixing tank, the low-speed impeller device 52 is located inside the mixing tank, the foam conveying device 53 is connected to the side of the mixing tank, and the valve device 54 is installed on the pipe at the bottom of the mixing tank. Cement slurry and sludge slurry enter the mixing device 5 through the conveying pipe 51, and foam enters the mixing device 5 through the foam conveying device 53. The cement slurry, sludge slurry, and foam are mixed by the low-speed impeller device 52, and the mixed mixture flows into the spraying device through the pipe at the bottom of the mixing tank.

[0042] In one embodiment, the low-speed impeller device 52 is driven by a low-speed motor to achieve slow and uniform mixing of cement slurry, sludge slurry and foam.

[0043] like Figure 7-8 As shown, in one embodiment, the leveling device 7 includes a hydraulic telescopic rod 71, a rolling shaft rotating device 72, and a scraper 73. The scraper 73 is connected to the rolling shaft rotating device 72, which is connected to the hydraulic telescopic rod 71. The hydraulic telescopic rod 71 controls the horizontal extension and retraction of the scraper 73, thereby compacting and leveling the concrete surface. The rolling shaft rotating device 72 is used to adjust the distance between the scraper 73 and the ground.

[0044] In one embodiment, the foam, high-water-content sludge, and cement slurry are each connected to the feed inlet of the mixing device via independent pipelines, and the supply rate is controlled by valves or metering devices to achieve precise proportional adjustment.

[0045] Example 1

[0046] This invention provides a construction method for embankment filling of stable high-water-content silt subgrade, specifically including the following steps:

[0047] 1) Connect the mobile frame 1 to the vehicle and drive it to the target location at the construction site, positioning it on one side of the roadbed to be filled;

[0048] 2) Start the foam making and conveying device 2, and inject the synthetic polymer surface active foaming agent and water at a ratio of 1:30 through the conveying pipe 21 at the top of the device. Use the air compression equipment in the foaming machine 22 to form bubbles with a density of about 48 kg / m³.

[0049] 3) Start the high water content sludge storage and conveying device 3, put the sludge with a water content of about 65% into the storage tank, and continuously stir it with the agitator 31.

[0050] 4) Start the cement mixing and conveying device 4, mix ordinary Portland cement and water at a ratio of 1:0.45, and stir thoroughly under the spiral mixer 41.

[0051] 5) Start the conveying device for sludge and cement. The sludge and cement are conveyed from the upper end of the mixing device 5 to the mixing tank of the mixing device 5 via the second high-pressure pumping device 32 and the third high-pressure pumping device 42. The materials are stirred in the mixing tank by the low-speed impeller device 52 for 5 minutes to make them evenly mixed.

[0052] 6) Start the foam production and conveying device, and convey the foam to the middle of the mixing device 5 through the first high-pressure pumping device 23. The volume ratio of foam to cement-sludge slurry is set to about 1:30 to obtain a suitable foam void structure.

[0053] 7) The impeller in the mixing device rotates slowly and the mixture is stirred for 10 minutes to fully mix the materials and minimize damage to the foam. After mixing, a high water content silt-stabilized foam concrete mixture with uniform pore distribution is formed.

[0054] 8) Open the valve device 54 in the mixing device, and use the spraying device 6 located at the bottom of the mobile frame to transport the mixture and spray it evenly onto the roadbed. The spraying thickness should be controlled at about 15 cm.

[0055] 9) Activate the leveling device 7 at the rear of the mobile frame. The leveling device moves with the vehicle and drives the scraper 73 to compact and level the concrete surface through the hydraulic telescopic rod 71. Adjust the height of the scraper 73 by rotating the rolling shaft device 72.

[0056] 10) This method allows for material preparation, spraying, and leveling operations to be completed in a continuous, mobile state, achieving integrated on-site construction. Testing revealed that the resulting roadbed fill layer has uniform density, a smooth surface, and strength and stability that are more than 20% higher than traditional step-by-step construction methods.

[0057] Example 2

[0058] This invention provides a method for constructing a stable high-moisture silt subgrade, specifically including the following steps: 1) The silt at the construction site originates from dredging of a nearby river channel, with a water content of approximately 68%. In its natural state, it is in a fluid-plastic state and lacks workability. The high-moisture silt stable subgrade filling construction device provided by this invention is used for on-site construction.

[0059] 2) The mobile frame 1 is towed to the construction starting point by a trailer and the vehicle body is leveled according to the design elevation.

[0060] 3) Start the foam production and conveying device 2, add foaming agent solution to the foaming device, and use the air compression system to foam to generate stable foam with a density of 50 kg / m³.

[0061] 4) Start the high water content sludge storage and conveying device 3, load the sludge after simple impurity removal and homogenization treatment into the storage tank, and turn on the agitator to prevent sedimentation.

[0062] 5) Start the cement mixing and conveying device 4, mix ordinary Portland cement and water at a ratio of 1:0.45, and stir thoroughly under a spiral mixer to obtain cement slurry with suitable consistency.

[0063] 6) Start the conveying device for sludge and cement, and convey it into the mixing tank from the top of the mixing device 5 through high pressure. The material is stirred in the mixing tank by a low-speed impeller for 5 minutes to make it evenly mixed.

[0064] 7) Start the foam production and conveying device, and convey the foam to the middle of the mixing device through the high pressure device. The volume ratio of high water content sludge, cement slurry and foam is maintained at 10:1:1 to obtain a suitable foam void structure.

[0065] 8) The low-speed impeller in the mixing device runs at a speed of about 35 r / min and mixes for 10 minutes to fully mix the materials and minimize damage to the foam. After mixing, a high water content silt-stabilized foam concrete mixture with uniform pore distribution is formed.

[0066] 9) Open the valve in the mixing device, and spray the mixture evenly onto the laid base layer through the spray nozzle of the spraying device 6. The thickness of the spray layer should be controlled at about 20 cm.

[0067] 10) Activate the leveling device 7 at the rear of the mobile vehicle frame. During the spraying process, the leveling device 7 works synchronously, using a horizontal scraper with automatic height adjustment to level and lightly compact the sprayed layer, so that the road surface flatness reaches ±5 mm.

[0068] 11) After construction, following 24 hours of initial setting and 7 days of curing, the unconfined compressive strength of the fill layer reached 0.9 MPa and the dry density reached 1.45 g / cm³, meeting the design requirements of the highway subgrade.

Claims

1. A construction device for stabilizing high-moisture-content silt roadbed filling, characterized in that, The system includes a mobile frame, and on the mobile frame are a foam production and conveying device, a high-moisture sludge storage and conveying device, and a cement mixing and conveying device. The cement mixing and conveying device, the high-moisture sludge storage and conveying device, and the foam production and conveying device are each connected to a mixing device on the mobile frame via independent conveying pipelines, for supplying cement, sludge, and foam to the mixing tank of the mixing device, respectively. The mixing device includes an impeller structure in the mixing tank, for thoroughly mixing the cement, sludge, and foam and protecting the foam structure. A spraying device is installed on the mobile frame and connected to the discharge port of the mixing device, for uniformly spraying the mixed mixture onto the roadbed. A leveling device is installed at the rear of the mobile frame, for leveling the sprayed mixture.

2. The stable high-moisture silt roadbed filling construction device according to claim 1, characterized in that, The mobile frame includes a trailer unit connected to the vehicle, and the mobile frame is a tire-type vehicle chassis.

3. The stable high-moisture-content silt roadbed filling construction device according to claim 1, characterized in that, The foam production and conveying device includes a foaming machine, a high-pressure pumping equipment, and corresponding pipelines, used to generate stable foam with a density of about 48~52 kg / m³ and pressurize and convey it to the mixing device.

4. The stable high-moisture-content silt roadbed filling construction device according to claim 1, characterized in that, The high water content sludge storage and conveying device includes a high water content sludge storage tank with a stirrer and a high pressure pumping device for pressurizing and conveying the high water content sludge to the stirring device.

5. The stable high-moisture silt roadbed filling construction device according to claim 1, characterized in that, The cement mixing and conveying device includes a cement mixing silo, a spiral mixing device, and a high-pressure pumping device, which are used to pressurize and convey the mixed cement to the mixing device.

6. The stable high-moisture-content silt roadbed filling construction device according to claim 1, characterized in that, The foam production and conveying device, the high water content sludge storage and conveying device, and the cement mixing and conveying device are independently connected to the feed inlet of the mixing device through their respective pipelines, and valve devices are installed on the pipelines to control the supply rate.

7. The stable high-moisture silt roadbed filling construction device according to claim 1, characterized in that, The mixing device is equipped with a multi-bladed low-speed impeller, which is driven by a low-speed motor and is used for slow and uniform mixing of cement slurry, sludge slurry and foam.

8. The stable high-moisture silt roadbed filling construction device according to claim 1, characterized in that, The mixing device also includes a control system for controlling the flow rate of cement, sludge, and foam, as well as the mixing time.

9. The stable high-moisture silt roadbed filling construction device according to claim 1, characterized in that, The spraying device includes a spray pipe located at the rear end of the vehicle frame for uniformly transporting the mixture to the roadbed; the leveling device includes a transverse metal scraper connected to a hydraulic telescopic rod, which is connected to a rolling shaft rotating device and a rolling shaft rotating device.

10. A method for constructing a stable high-moisture-content silt roadbed, characterized in that, Construction using the high-moisture-content silt-stabilized subgrade filling construction device as described in any one of claims 1-9 includes the following steps: (1) Start the mobile frame and position it on one side of the roadbed to be filled; (2) Start the foam making and conveying device, inject the foaming agent into the foam foaming device to obtain foaming liquid, and use the air compression equipment in the foam foaming device to form bubbles with stable density; connect it independently to the feed port of the stirring device through the pipeline; (3) Start the high water content sludge storage and conveying device, add the high water content sludge to the high water content sludge storage tank, and connect it to the feed port of the mixing device through the pipeline. (4) Start the cement mixing and conveying device, add cement and water into it, and premix the cement slurry through the spiral mixer. Connect the cement slurry to the feed port of the mixing device through a pipeline. (5) Start the mixing device. The impeller rotates at low speed in the mixing tank of the mixing device to fully mix the cement, high water content sludge and foam transported by the pipeline, and keep the foam structure intact. (6) After mixing, a mixture is obtained. The spraying device sprays the mixture through the nozzle onto the roadbed to be filled. Then, the leveling device is started. The leveling device is driven by a mechanical drive to push along the road surface and smooth the surface of the sprayed mixture.

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