A low-carbon high-performance synchronous grouting material based on shield soil is prepared on site
By modularly arranging low-carbon, high-performance synchronous grouting material production equipment on the ground of the shield tunneling working shaft, low-carbon, high-performance materials can be prepared on-site, solving the problems of space constraints, composition fluctuations, and carbon emissions in the treatment of excavated soil, and realizing the goals of resource utilization of excavated soil and green construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI SHEN YUAN GEOTECHN
- Filing Date
- 2025-08-18
- Publication Date
- 2026-08-04
AI Technical Summary
The disposal of excavated soil generated during shield tunneling faces challenges such as spatial constraints, low conversion efficiency, large fluctuations in composition, and high carbon emissions. This results in long transportation times for excavated soil, unstable strength of grouting materials, and large carbon emissions, making it difficult to achieve the goal of green construction.
Design an in-situ production equipment for low-carbon, high-performance synchronous grouting materials based on shield tunneling soil, including a feeding system, a forced mixing system, a grout storage and fine-tuning system, a mud pump, a mixing system, a powder storage and conveying system, an admixture storage and conveying system, and a finished grout pump. The equipment is modularly arranged on the ground of the shield tunneling working shaft to prepare low-carbon, high-performance materials in situ, thereby realizing the resource utilization of the excavated soil.
It enables the on-site conversion and utilization of construction waste, reduces the amount of waste transported, lowers construction costs, improves construction efficiency, ensures stable strength of grouting material, reduces carbon emissions, and is suitable for the development and utilization of urban underground space.
Smart Images
Figure CN224588306U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of waste soil resource utilization, and in particular to a device for on-site production of low-carbon, high-performance synchronous grouting material based on shield tunnel soil. Background Technology
[0002] With the rapid development of the national economy and the advancement of intelligent and green development trends, tunnel boring machine (TBM) technology is also moving towards automation, intelligence, and greening. The application areas of TBMs are expanding, particularly in the development and utilization of urban underground space, such as subway tunnels, municipal highway tunnels, municipal underground pipelines, and underground utility tunnels. However, this also brings new problems. For example, the TBM tunneling process generates a large amount of excavated soil, which often has a high water content and high fluidity. Traditional disposal methods mainly involve off-site transportation and stockpiling or landfilling, which not only occupies a large amount of land resources but may also cause environmental pollution, becoming a bottleneck restricting urban development.
[0003] Specifically, in earth pressure balance shield tunneling projects, there are three major technical bottlenecks in the utilization of excavated soil and the preparation of grouting materials, which restrict the realization of green construction goals:
[0004] 1. Spatial constraints and conversion efficiency issues:
[0005] The working face of a shield tunneling shaft is typically ≤200m², while traditional slag slurry preparation equipment is >8m high and occupies >150m², making it impossible to deploy on-site. This results in slag having to be transported to a fixed plant for processing, with a transfer time of >48 hours.
[0006] 2. Issues related to component fluctuations and proportioning accuracy:
[0007] The moisture content of the tunnel boring machine's excavated soil fluctuated by ±15%, and the strength dispersion coefficient of the grouting material prepared by the traditional volumetric metering method was as high as 0.35 (the specification requires ≤0.15), resulting in the segment misalignment rate exceeding the standard (>10mm).
[0008] 3. The conflict between carbon emissions and material performance:
[0009] Traditional cement-based grouting materials emit carbon emissions greater than 800 kg CO2 / m³, while low-carbon alternatives (such as slag powder) require long-distance transportation, with the grout bleeding rate increasing by 23% over a 50 km transport distance. Summary of the Invention
[0010] The purpose of this invention is to address the shortcomings of existing technologies by providing an in-situ production device for low-carbon, high-performance synchronous grouting materials based on shield tunneling soil. This device comprises a feeding system, a forced mixing system, a slurry storage and fine-tuning system, a mud pump, a mixing system, a powder storage and conveying system, an admixture storage and conveying system, a finished slurry pump, and a central control system. By utilizing the excavated soil generated during earth pressure balance shield tunneling, the device is located on the ground of the shield tunneling shaft to produce low-carbon, high-performance materials that meet the requirements for synchronous grouting and backfilling. This achieves in-situ conversion and utilization of excavated soil, reduces the amount of soil transported, lowers construction costs, and improves construction efficiency.
[0011] The objective of this utility model is achieved through the following technical solution:
[0012] A device for on-site production of low-carbon, high-performance synchronous grouting material based on shield tunneling soil is disclosed. The device includes a feeding system, a forced mixing system, a grout storage and fine-tuning system, a mud pump, a mixing system, a powder storage and conveying system, an admixture storage and conveying system, and a finished grout pump. The feeding system includes a hopper and a screw conveyor, the screw conveyor being inclined, with the outlet of the hopper connected to the inlet of the screw conveyor. The forced mixing system includes a mixing chamber and a spray pipe. The mixing chamber houses a high-speed rotating cutterhead, and the inlet at the top of the mixing chamber is connected to the outlet of the screw conveyor. The spray pipe is installed at the inlet of the mixing chamber. The grout storage and fine-tuning system includes a mixing drum, a mixing device, and a mud circulation pump. The mixing device is installed inside the mixing drum and arranged axially along the drum, and the mud circulation pump is installed within the mixing drum. The discharge port of the slurry circulation pump is connected to the inlet of the mixing tank of the forced mixing system via a slurry circulation pipe; the inlet of the mixing drum is connected to the discharge port of the mixing tank of the forced mixing system; the inlet of the slurry pump is connected to the discharge port of the mixing drum of the slurry storage and fine-tuning system; the mixing system includes a slurry feeding silo, a powder feeding silo, a mixing silo, and a temporary storage silo; the inlet of the slurry feeding silo is connected to the discharge port of the slurry pump; the inlet of the powder feeding silo is connected to the discharge ports of the powder storage and conveying system and the admixture storage and conveying system; the discharge ports of the slurry feeding silo and the powder feeding silo are connected to the inlet of the mixing silo; the discharge port of the mixing silo is connected to the inlet of the temporary storage silo; and the inlet of the finished slurry pump is connected to the discharge port of the temporary storage silo.
[0013] The screw conveyor includes a placement trough and a screw conveyor, which are coaxially arranged. The storage hopper is installed at the lower end of the placement trough, and the top of the storage hopper is horizontal.
[0014] The stirring device of the slurry fine-tuning system consists of a stirring motor and stirring blades.
[0015] The mixing drum of the slurry fine-tuning system is equipped with a specific gravity testing device.
[0016] The powder storage and conveying system includes a powder storage bin and a powder screw conveyor, wherein the outlet of the powder storage bin is connected to the inlet of the powder screw conveyor.
[0017] The admixture storage and conveying system includes an admixture storage bin and an admixture screw conveyor, wherein the outlet of the admixture storage bin is connected to the inlet of the admixture screw conveyor.
[0018] The mixing system also includes an air compressor, which is connected to pneumatic valves at the outlets of the mud feeding silo, the powder feeding silo, and the mixing silo.
[0019] The mixing system also includes a weighing sensor, which is used to weigh the mud feeding hopper and the powder feeding hopper.
[0020] The equipment also includes a central control system, which controls the feeding system, the forced mixing system, the slurry storage and fine-tuning system, the mud pump, the mixing system, the powder storage and conveying system, the admixture storage and conveying system, and the finished slurry pump.
[0021] The advantages of this utility model are:
[0022] 1. The equipment is modular, with an overall height of ≤5.0m, making it suitable for placement near the shield tunnel end shaft and next to the soil collection pit, facilitating the on-site use of shield tunnel slag to produce low-carbon, high-performance materials.
[0023] 2. The equipment is highly digitalized and can collect soil slurry specific gravity, soil slurry weight, powder weight, and admixture weight. After setting various parameters, the central control system can automatically control the preparation of each component. Only one excavator is needed to load the soil and one worker can operate it on the digital platform.
[0024] 3. The preparation process can be customized according to the needs, and the amount of powder and admixture can be adjusted in real time to match the requirements of low-carbon high-performance materials with different properties. Attached Figure Description
[0025] Figure 1 This is a top view of the device for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunnel soil, which is the subject of this utility model.
[0026] Figure 2 This is a front view of the device for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunnel soil, which is the subject of this utility model.
[0027] Figure 3 This is a side view of the device for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunnel soil, which is the subject of this utility model.
[0028] Figure 4 This is a schematic diagram of the on-site fabrication equipment for low-carbon, high-performance synchronous grouting materials based on shield tunnel soil, which is the present invention.
[0029] Figure 5 This is a diagram showing the layout of the on-site fabrication equipment for low-carbon, high-performance synchronous grouting materials based on shield tunnel soil in the shield tunnel end shaft.
[0030] like Figures 1-5 As shown in the figure, the markings represent:
[0031] Feeding system 10, storage hopper 101, screw conveyor 102, forced mixing system 20, mixing box 201, slurry fine-tuning system 30, mixing drum 301, mixing device 302, mud pump 40, mixing system 50, mud feeding silo 501, powder feeding silo 502, mixing silo 503, temporary storage silo 504, air compressor 505, powder storage and conveying system 60, powder storage silo 601, powder screw conveyor 602, admixture storage and conveying system 70, admixture storage silo 701, admixture screw conveyor 702, finished slurry pump 80, central control system 90;
[0032] Shield tunneling end shaft A, soil collection pit B. Detailed Implementation
[0033] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:
[0034] Example: Figures 1-5As shown, this embodiment relates to an on-site production equipment for low-carbon, high-performance synchronous grouting materials based on shield tunneling soil. This equipment is located near the shield tunneling end shaft A and the soil collection pit B. The equipment mainly includes a feeding system 10, a forced mixing system 20, a slurry storage and fine-tuning system 30, a mud pump 40, a mixing system 50, a powder storage and conveying system 60, an admixture storage and conveying system 70, a finished slurry pump 80, and a central control system 90. The feeding system 10 is used for temporarily placing and conveying shield tunneling soil, the forced mixing system 20 is used for crushing the shield tunneling soil to prepare slurry, and the slurry storage and fine-tuning system 30 is used for storing the prepared slurry. The system includes a slurry pump 40 for testing and adjusting the specific gravity of the slurry, a slurry pump 40 for conveying the finished slurry, a mixing system 50 for preparing low-carbon high-performance materials, a powder storage and conveying system 60 for storing and conveying the curing agent, an admixture storage and conveying system 70 for storing and conveying the admixture, and a finished slurry pump 80 for conveying the finished low-carbon high-performance materials. The central control system 90 is connected to the feeding system 10, the forced mixing system 20, the slurry storage and fine-tuning system 30, the slurry pump 40, the mixing system 50, the powder storage and conveying system 60, the admixture storage and conveying system 70, and the finished slurry pump 80, and controls each component.
[0035] like Figures 1-5 As shown, the feeding system 10 includes a storage hopper 101 and a screw conveyor 102. The screw conveyor 102 is inclined and includes a placement trough and a screw conveyor, which are coaxially arranged. The storage hopper 101 is installed at the lower end of the placement trough, and the top of the storage hopper 101 is horizontal. The discharge port of the storage hopper 101 is connected to the inlet of the screw conveyor 102. After the shield tunneling excavated soil is placed in the storage hopper 101, the screw conveyor 102, according to the speed set by the central control system 90, uniformly transports the shield tunneling excavated soil to the forced mixing system 20.
[0036] The forced mixing system 20 includes a mixing tank 201 and a spray pipe (not shown). The mixing tank 201 houses a high-speed rotating cutterhead (not shown), which is vertically positioned (perpendicular to the ground). The feed inlet at the top of the mixing tank 201 is connected to the discharge outlet of the screw conveyor 102. The spray pipe is installed at the feed inlet of the mixing tank 201. Shield tunnel excavation soil enters the mixing tank 201 at the speed set by the central control system 90. Water is sprayed from the spray pipe at the speed set by the central control system 90. The shield tunnel excavation soil and water enter the mixing tank 201 simultaneously. After being mixed by the high-speed rotating cutterhead, the slurry flows out from the discharge outlet of the mixing tank 201 and enters the slurry storage and fine-tuning system 30.
[0037] The slurry fine-tuning system 30 includes a mixing drum 301, a mixing device 302, a slurry circulation pump (not shown), and a specific gravity testing device (not shown). The mixing device 302 is installed inside the mixing drum 301 and is arranged along the axial direction of the mixing drum 301. The mixing device 302 consists of a mixing motor and mixing blades. The mixing motor is installed on the top of the mixing drum 301 through a fixing plate. The output shaft of the mixing motor extends into the mixing drum 301 and is connected to the mixing blades. The mixing motor drives the mixing blades to rotate. A specific gravity testing device is installed inside the mixing drum 301. The slurry circulation pump is installed inside the mixing drum 301, and the outlet of the slurry circulation pump is connected to the inlet of the mixing chamber 201 of the forced mixing system 20 through a circulating slurry pipe (not shown). The inlet of the mixing drum 301 is connected to the outlet of the mixing chamber 201 of the forced mixing system 20. After the mud flows from the forced mixing system 20 into the slurry storage and fine-tuning system 30, the mixing motor drives the mixing blades to rotate, ensuring that the mud is uniform. The specific gravity testing device measures the specific gravity of the mud by combining the liquid level tester with the weighing. If the specific gravity is greater than the set specific gravity, the central control system 90 calculates the amount of water to be added and controls the water pump of the slurry storage and fine-tuning system 30 to add water. If the specific gravity is less than the set specific gravity, the central control system 90 calculates the amount of soil to be added. The mud circulation pump of the slurry storage and fine-tuning system 30 pumps the mud to the feed port of the forced mixing system 20. The mud and the shield tunneling excavated soil enter the mixing tank 201 of the forced mixing system 20 at the same time and are mixed into mud with the set specific gravity.
[0038] The inlet of the mud pump 40 is connected to the outlet of the mixing drum 301 of the slurry storage and fine-tuning system 30. The powder storage and conveying system 60 includes a powder storage silo 601 and a powder screw conveyor 602 (set at an incline), with the outlet of the powder storage silo 601 connected to the inlet of the powder screw conveyor 602. The admixture storage and conveying system 70 includes an admixture storage silo 701 and an admixture screw conveyor 702 (set at an incline), with the outlet of the admixture storage silo 701 connected to the inlet of the admixture screw conveyor 702. The mixing system 50 includes a slurry feeding silo 501, a powder feeding silo 502, a mixing chamber 503, a temporary storage silo 504, an air compressor 505, and a weighing sensor (not shown). The inlet of the slurry feeding silo 501 is connected to the outlet of the slurry pump 40. The inlet of the powder feeding silo 502 is connected to the outlets of the powder screw conveyor 602 and the blending material screw conveyor 702, respectively. The outlets of the slurry feeding silo 501 and the powder feeding silo 502 are connected to the mixing chamber 503. The feed inlet of the mixing silo 503 is connected to the feed inlet of the temporary storage silo 504. The air compressor 505 is connected to the pneumatic valves at the discharge outlets of the mud feeding silo 501, the powder feeding silo 502, and the mixing silo 503. The weighing sensor is used to weigh the mud feeding silo 501 and the powder feeding silo 502. The weighing sensor is installed at the bottom of the mud feeding silo 501 and the powder feeding silo 502. By weighing the mud feeding silo 501 and the powder feeding silo 502, the mud and powder (admixture) are weighed. The feed inlet of the finished slurry pump 80 is connected to the discharge outlet of the temporary storage silo 504. The central control system 90 controls the mud pump 40 to pump the set weight of mud to the mud feeding silo 501, controls the powder storage and conveying system 60 to convey the set weight of curing agent to the powder feeding silo 502 through the powder screw conveyor 602, and controls the admixture storage and conveying system 70 to convey the set weight of admixture to the powder feeding silo 502 through the admixture screw conveyor 702. The central control system 90 controls the air compressor 505 to open the pneumatic valves of the mud feeding silo 501 and the powder feeding silo 502, and the mud, curing agent and admixture enter the mixing chamber 503 for mixing. After the mixing time reaches the set time, the central control system 90 controls the air compressor 505 to open the pneumatic valve at the bottom of the mixing chamber 503, and the finished low-carbon high-performance material slurry flows to the temporary storage silo 504. The low-carbon high-performance material preparation is completed and can be pumped to the preset location by the finished product slurry pump 80.
[0039] The beneficial technical effects of this embodiment are as follows:
[0040] 1. The equipment is modular, with an overall height of ≤5.0m, making it suitable for placement near the shield tunnel end shaft and next to the soil collection pit, facilitating the on-site use of shield tunnel slag to produce low-carbon, high-performance materials.
[0041] 2. The equipment is highly digitalized and can collect soil slurry specific gravity, soil slurry weight, powder weight, and admixture weight. After setting various parameters, the central control system can automatically control the preparation of each component. Only one excavator is needed to load the soil and one worker can operate it on the digital platform.
[0042] 3. The preparation process can be customized according to the needs, and the amount of powder and admixture can be adjusted in real time to match the requirements of low-carbon high-performance materials with different properties.
Claims
1. A device for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunnel soil, characterized in that... The equipment includes a feeding system, a forced mixing system, a slurry storage and fine-tuning system, a mud pump, a mixing and stirring system, a powder storage and conveying system, an admixture storage and conveying system, and a finished slurry pump. The feeding system includes a hopper and a screw conveyor, the screw conveyor being inclined, and the outlet of the hopper being connected to the inlet of the screw conveyor. The forced mixing system includes a mixing chamber and a spray pipe. The mixing chamber contains a high-speed rotating cutter disc, and the inlet at the top of the mixing chamber is connected to the outlet of the screw conveyor. The spray pipe is installed at the inlet of the mixing chamber. The slurry storage and fine-tuning system includes a mixing drum, a mixing device, and a mud circulation pump. The mixing device is installed inside the mixing drum and arranged along its axial direction. The mud circulation pump is installed inside the mixing drum, and its outlet is... The slurry pump is connected to the inlet of the mixing tank of the forced mixing system via a circulating slurry pipe; the inlet of the mixing drum is connected to the outlet of the mixing tank of the forced mixing system; the inlet of the slurry pump is connected to the outlet of the mixing drum of the slurry storage and fine-tuning system; the mixing system includes a slurry feeding silo, a powder feeding silo, a mixing silo, and a temporary storage silo; the inlet of the slurry feeding silo is connected to the outlet of the slurry pump; the inlet of the powder feeding silo is connected to the outlets of the powder storage and conveying system and the admixture storage and conveying system; the outlets of the slurry feeding silo and the powder feeding silo are connected to the inlet of the mixing silo; the outlet of the mixing silo is connected to the inlet of the temporary storage silo; and the inlet of the finished slurry pump is connected to the outlet of the temporary storage silo.
2. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The screw conveyor includes a placement trough and a screw conveyor, which are coaxially arranged. The storage hopper is installed at the lower end of the placement trough, and the top of the storage hopper is horizontal.
3. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The stirring device of the slurry fine-tuning system consists of a stirring motor and stirring blades.
4. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The mixing drum of the slurry fine-tuning system is equipped with a specific gravity testing device.
5. The on-site fabrication equipment for low-carbon, high-performance synchronous grouting materials based on shield tunneling soil as described in claim 1, characterized in that... The powder storage and conveying system includes a powder storage bin and a powder screw conveyor, wherein the outlet of the powder storage bin is connected to the inlet of the powder screw conveyor.
6. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The admixture storage and conveying system includes an admixture storage bin and an admixture screw conveyor, wherein the outlet of the admixture storage bin is connected to the inlet of the admixture screw conveyor.
7. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The mixing system also includes an air compressor, which is connected to pneumatic valves at the outlets of the mud feeding silo, the powder feeding silo, and the mixing silo.
8. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The mixing system also includes a weighing sensor, which is used to weigh the mud feeding hopper and the powder feeding hopper.
9. The equipment for on-site fabrication of low-carbon, high-performance synchronous grouting material based on shield tunneling soil as described in claim 1, characterized in that... The equipment also includes a central control system, which controls the feeding system, the forced mixing system, the slurry storage and fine-tuning system, the mud pump, the mixing system, the powder storage and conveying system, the admixture storage and conveying system, and the finished slurry pump.