Curing slurry prepared based on engineering waste slurry and preparation method thereof
Through the combination of pretreatment of engineering slurry and the cured slurry production system, the problem of low resource utilization rate of engineering slurry is solved, and efficient production of cured slurry with certain strength, water stability and low permeability is achieved to meet the construction Demand and reduce costs.
Patent Information
- Application Number
- CN202411334486.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2024-12-17
AI Technical Summary
In the prior art, the resource utilization rate of engineering slurry is low, the processing cost is high, and there is a lack of a method that can effectively provide a solidified slurry with a certain strength, water stability and low permeability to meet construction needs.
Through the combination of engineering slurry pretreatment and mixing pile and rotary spray pile curing slurry production systems, a solidified slurry with a certain strength, water stability and low permeability are prepared by filtering and filtering and specific gravity adjustment. Improve resource utilization and reduce construction costs.
It significantly improves the utilization rate of engineering slurry waste resources, saves raw material costs, reduces environmental damage, and can stably and continuously produce solidified slurry that meets construction needs.
Smart Images
Figure CN119143436A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a solidifying slurry prepared based on engineering waste slurry and a preparation method thereof, belonging to the technical field of solidifying slurry for engineering. Background Art
[0002] With the rapid development of the national economy, urban renovation projects, old urban reconstruction projects and underground transportation construction are developing in full swing, and the annual amount of construction waste exceeds 3×10 9 tons, and is expected to reach 4×10 9 However, the current resource utilization rate of construction waste in large and medium-sized cities does not exceed 10%, which is far behind the level of construction waste resource utilization in developed countries.
[0003] At present, since engineering waste slurry is mainly dehydrated on site and produced on-site foundation backfill soil and greening soil, there is little centralized disposal for deep processing and reuse, which results in high processing costs and low resource utilization rate. The method of preparing solidified slurry for mixing piles and jet grouting piles based on engineering waste slurry can effectively solve the above problems. Summary of the invention
[0004] The present invention aims to solve the technical problems existing in the prior art.
[0005] To this end, the present invention provides a solidifying slurry prepared based on engineering waste slurry and a preparation method thereof. The method utilizes solidifying slurry production equipment for mixing piles and rotary jet piles based on engineering waste slurry to meet the supply requirements of solidifying slurry with certain strength, water stability and low permeability, while improving the resource utilization rate of engineering waste slurry and saving construction costs.
[0006] The purpose of the present invention is achieved by the following technical solutions: A method for preparing a solidified slurry based on engineering waste slurry, the method comprising the following steps: (1) Pretreatment of engineering waste slurry: Use the engineering waste slurry pretreatment system to stir the engineering waste slurry, filter it with a filter screen of not less than 40 mesh to remove solid particles mixed in the engineering waste slurry, and adjust the specific gravity of the engineering waste slurry to obtain soil slurry; (2) Preparing a solidifying slurry for a mixing pile or a rotary jet grouting pile: introducing the soil slurry obtained in step (1) into a system for preparing a solidifying slurry for a mixing pile or a rotary jet grouting pile, then adding a curing agent slurry, adjusting the specific gravity of the slurry, and stirring the slurry in a mixing box to prepare a solidifying slurry for preparing a mixing pile or a rotary jet grouting pile; (3) Pumping of solidified slurry for mixing piles and rotary jet grouting piles.
[0007] Preferably, the solidifying slurry of the mixing piles and rotary jet piles is produced by a pretreatment system for engineering waste slurry and a production system for the solidifying slurry of the mixing piles and rotary jet piles.
[0008] Preferably, the engineering waste slurry pretreatment system in step (1) comprises a mud box, a mud specific gravity fine-tuning box, a water tank and a mud pump, the inlet of the mud specific gravity fine-tuning box is connected to the outlets of the mud box and the water tank respectively, and a mud pump is provided between the water tank and the mud specific gravity fine-tuning box; two stirring heads are provided in the mud box, and a filter screen is provided at the outlet of the mud box; two stirring heads are provided in the mud specific gravity fine-tuning box, and a mud specific gravity monitoring system is provided at the lower part of the interior of the mud specific gravity fine-tuning box; the outlet of the mud specific gravity fine-tuning box is connected to the mixing pile and the rotary spraying solidification slurry making system, and a mud pump is provided between the two; the engineering waste slurry pretreatment system controls the engineering waste slurry stored in the mud box to be stirred evenly, and after being filtered by the filter screen, it is sent to the mud specific gravity fine-tuning box, and at the same time, the stirring head in the mud specific gravity fine-tuning box is stirred; after the engineering waste slurry is stirred evenly, the mud specific gravity monitoring system monitors the engineering waste slurry specific gravity.
[0009] Preferably, the engineering waste slurry specific gravity after adjustment in step (1) is 1.1-1.4; when the engineering waste slurry specific gravity is greater than the set value, the engineering waste slurry pretreatment system controls the water tank to slowly add water to the mud specific gravity fine-tuning box, stirring while adding water, until the difference between the engineering waste slurry specific gravity and the set value is controlled within 5%.
[0010] Preferably, the engineering waste slurry in step (1) comes from the waste and residual slurry generated by the construction of bored piles for foundation and foundation pit protection of various buildings (structures), slurry shield and pipeline network underground excavation.
[0011] Preferably, the curing agent slurry in step (2) is a mixture of water and curing agent, and the mass ratio of the two is 1:1; the curing agent is composed of 1 part of calcium-based activator, 1 part of cement and 5 parts of mineral powder.
[0012] Preferably, in step (2), the specific gravity of the slurry is adjusted to 1.5-1.7.
[0013] Preferably, the mixing pile and jet-jet pile solidification slurry production system in step (2) comprises a mixing barrel, a silo, a weighing system, a mixing and stirring box, a mud storage tank and a stirring head; the outlet of the silo is connected to the inlet of the mixing barrel; a stirring head is provided in the mixing barrel; the inlet of the mixing and stirring box is respectively connected to the outlets of the mixing barrel and the mud storage tank; a stirring head is provided in the mixing and stirring box; and the bottom of the mud storage tank is connected to the weighing system.
[0014] Preferably, the silo and the mixing barrel are also connected to weighing systems respectively. The mixing pile and rotary jet pile solidifying slurry production system in the step (2) controls the silo weighing system in the engineering waste slurry pretreatment system. The weighing system in the silo weighs the water and the curing agent respectively, adds them to the mixing barrel and stirs them evenly to form the curing agent slurry; the weighing systems in the mixing barrel and the mud storage box weigh the curing agent slurry and the soil slurry respectively, add them to the mixing box, and the mixing head in the mixing box stirs them evenly to form the solidifying slurry for preparing mixing piles and rotary jet piles.
[0015] Preferably, the solidified slurry used to prepare the mixing piles and rotary jet piles in step (3) is pumped by a high-pressure pump and directly used in the on-site mixing pile and rotary jet pile construction.
[0016] The beneficial effects of the present invention are as follows: 1. The present invention prepares the solidified slurry of mixing piles and rotary jet piles based on the engineering waste slurry, which can greatly improve the resource utilization rate of the engineering waste slurry and save the cost of raw materials.
[0017] 2. The solidified slurry produced by the present invention can replace cement slurry and reduce damage to the environment.
[0018] 3. The production method of the present invention is based on information equipment and can stably and continuously produce solidified slurry with certain strength, water stability and low permeability to meet construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a flow chart of a method for preparing a solidified slurry based on engineering waste slurry according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the device used in the embodiment of the present invention, wherein: 1. Pretreatment system for engineering waste slurry; 2. Mixing pile and jet-jet pile solidification slurry production system; 3. Mud box; 4. Filter screen; 5. Mud density fine-tuning box; 6. Mixing head; 7. Mud density monitoring system; 8. Water tank; 9. Mud pump; 10. Mixing barrel; 11. Silo; 12. Weighing system; 13. Mixing and stirring box; 14. Mud storage tank; 15. High-pressure pump. DETAILED DESCRIPTION
[0020] In order to better understand the present invention, the content of the present invention is further explained in conjunction with the following examples, but the content of the present invention is not limited to the following examples. In the following examples, the structural schematic diagram of the stirring device used is shown in Figure 2 .
[0021] A method for preparing a solidified slurry based on engineering waste slurry, the preparation process is as follows Figure 1 As shown: (1) Pretreatment of engineering waste slurry: The engineering waste slurry pretreatment system 1 controls the engineering waste slurry stored in the mud box 3 to be evenly stirred by the stirring head 6, filtered by the filter 4, and then sent to the mud specific gravity fine-tuning box 5. At the same time, the stirring head 6 in the mud specific gravity fine-tuning box 5 performs stirring treatment; after the engineering waste slurry is evenly stirred, the mud specific gravity monitoring system 7 monitors the engineering waste slurry specific gravity as 1.1-1.4, which is compared with the set value. When the engineering waste slurry specific gravity is greater than the set value, the engineering waste slurry pretreatment system 1 controls the water tank 8 to slowly add water to the mud specific gravity fine-tuning box 5 until the difference between the engineering waste slurry specific gravity and the set value is controlled within 5%; the prepared soil slurry is stored in the mud storage box 14; The engineering waste slurry pretreatment system 1 includes a mud box 3, a mud specific gravity fine-tuning box 5, a water tank 8 and a mud pump 9. The inlet of the mud specific gravity fine-tuning box 5 is connected to the outlets of the mud box 3 and the water tank 8 respectively, and a mud pump 9 is provided between the water tank 8 and the mud specific gravity fine-tuning box 5; two stirring heads 6 are provided in the mud box 3, and a filter screen 4 is provided at the outlet of the mud box 3; two stirring heads 6 are provided in the mud specific gravity fine-tuning box 5, and a mud specific gravity monitoring system is provided at the lower part of the mud specific gravity fine-tuning box 5 7; the outlet of the mud density fine-tuning box 5 is connected to the mixing pile and the rotary jet solidification slurry production system, and a mud pump 9 is provided between the two; the engineering waste slurry pretreatment system 1 controls the engineering waste slurry stored in the mud box 3 to be stirred evenly, and after being filtered by the filter screen 4, it is sent to the mud density fine-tuning box 5, and at the same time, the stirring head 6 in the mud density fine-tuning box 5 is stirred; after the engineering waste slurry is stirred evenly, the mud density monitoring system 7 monitors the engineering waste slurry density.
[0022] (2) Preparation of solidifying slurry for mixing piles and rotary jet piles: Control the weighing system 12 in the water tank 8 and the silo 11 to weigh water and solidifying agent (1 part of calcium-based activator, 1 part of cement and 5 parts of mineral powder) according to the set water-cement ratio, with a mass ratio of 1:1, add them into the mixing barrel 10 and stir them evenly to form solidifying agent slurry, and adjust the slurry specific gravity to 1.5. The weighing system 12 weighs the solidifying agent slurry and the soil slurry in the mud storage tank 14 and adds them to the mixing tank 13, stirs them evenly to form solidifying slurry for preparing mixing piles and rotary jet piles; The mixing pile and jet-jet pile solidification slurry production system 2 includes a mixing barrel 10, a silo, a weighing system 12, a mixing and stirring box 13, a mud storage box 14 and a stirring head 6; the outlet of the silo 11 is connected to the inlet of the mixing barrel 10; a stirring head 6 is provided in the mixing barrel 10; the inlet of the mixing and stirring box 13 is respectively connected to the outlets of the mixing barrel 10 and the mud storage box 14; a stirring head 6 is provided in the mixing and stirring box 13; the bottom of the mud storage box 14 is connected to the weighing system 12; the silo 11 and the mixing barrel 10 are also respectively connected to the weighing system 12, The mixing pile and rotary jet pile solidifying slurry production system 2 controls the silo 11 weighing system 12 in the engineering waste slurry pretreatment system 1. The weighing system 12 in the silo 11 weighs the water and the solidifying agent respectively, adds them into the mixing barrel 10 and mixes them evenly to make the solidifying agent slurry; the weighing systems 12 in the mixing barrel 10 and the mud storage box 14 weigh the solidifying agent slurry and the soil slurry respectively, add them into the mixing and stirring box 13, and the mixing head 6 in the mixing and stirring box 13 mixes them evenly to make the solidifying slurry for preparing mixing piles and rotary jet piles.
[0023] (3) Pumping of solidifying slurry for mixing piles and rotary jet piles: The solidifying slurry for preparing mixing piles and rotary jet piles is pumped to the mixing pile and rotary jet pile site by a high-pressure pump 15 and directly used in on-site construction.
[0024] Test Example 1: In the above embodiments, the unconfined compressive strength is used to represent the curing strength of the curing slurry, and the measuring method is as follows: a cubic test mold with a size of 70.5 mm × 70.5 mm × 70.5 mm is selected, the test mold is poured with the curing slurry, and the mold is demolded after 48 hours. The test piece is placed in a standard curing room with a temperature of 20±2°C and a relative humidity of >95% for curing for 7d, 14d, and 28d, and the compressive strength of the test piece is tested using an unconfined uniaxial press.
[0025] The curing slurry has a specific gravity of 1.5, and each cubic meter of slurry contains 750 kg of water, 500 kg of curing agent, and 250 kg of dry soil. The test strengths at 7d, 14d, and 28d are 5.3Mpa, 12.8Mpa, and 17.3Mpa, respectively.
[0026] The curing slurry has a specific gravity of 1.6, and each cubic meter of slurry contains 750 kg of water, 500 kg of curing agent, and 350 kg of dry soil. The test strengths at 7d, 14d, and 28d are 4.7Mpa, 10.6Mpa, and 15.1Mpa, respectively.
[0027] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will appreciate that various improvements and modifications may be made to the present invention without departing from the scope of the claims.
Claims
1. A method for preparing solidified slurry based on engineering waste slurry, characterized in that: The method comprises the following steps: (1) Pretreatment of engineering waste slurry: In the engineering waste slurry pretreatment system, the engineering waste slurry is stirred, filtered using a filter screen with a mesh size of not less than 40, and the specific gravity of the engineering waste slurry is adjusted to obtain soil slurry; (2) Preparing a solidifying slurry for a mixing pile or a rotary jet grouting pile: introducing the soil slurry obtained in step (1) into a system for preparing a solidifying slurry for a mixing pile or a rotary jet grouting pile, then adding a curing agent slurry, adjusting the specific gravity of the slurry, and stirring the slurry in a mixing box to prepare a solidifying slurry for preparing a mixing pile or a rotary jet grouting pile; (3) Pumping of solidified slurry for mixing piles and rotary jet grouting piles.
2. The preparation method according to claim 1, characterized in that: The production of the solidified slurry of the mixing piles and the rotary jet piles is completed by the engineering waste slurry pretreatment system and the mixing piles and the rotary jet pile solidified slurry production system.
3. The preparation method according to claim 1, characterized in that: The engineering waste slurry pretreatment system in step (1) comprises a mud box, a mud specific gravity fine-tuning box, a water tank and a mud pump, wherein the inlet of the mud specific gravity fine-tuning box is connected to the outlets of the mud box and the water tank respectively, and a mud pump is provided between the water tank and the mud specific gravity fine-tuning box; two stirring heads are provided in the mud box, and a filter screen is provided at the outlet of the mud box; two stirring heads are provided in the mud specific gravity fine-tuning box, and a mud specific gravity monitoring system is provided at the lower part of the mud specific gravity fine-tuning box; the outlet of the mud specific gravity fine-tuning box is connected to a mixing pile and a rotary spraying solidification slurry making system, and a mud pump is provided between the two; the engineering waste slurry pretreatment system controls the engineering waste slurry stored in the mud box to be stirred evenly, and after being filtered by the filter screen, it is sent to the mud specific gravity fine-tuning box, and at the same time, the stirring head in the mud specific gravity fine-tuning box is stirred; after the engineering waste slurry is stirred evenly, the mud specific gravity monitoring system monitors the engineering waste slurry specific gravity.
4. The preparation method according to claim 1, characterized in that: The engineering waste slurry specific gravity after adjustment in step (1) is 1.1-1.4; when the engineering waste slurry specific gravity is greater than the set value, the engineering waste slurry pretreatment system controls the water tank to slowly add water to the mud specific gravity fine-tuning box, stirring while adding water, until the difference between the engineering waste slurry specific gravity and the set value is controlled within 5%.
5. The preparation method according to claim 1, characterized in that: The engineering waste slurry in step (1) comes from the waste and residual slurry generated by the construction of bored piles for foundation and foundation pit protection of various buildings (structures), slurry shield and pipeline network underground excavation.
6. The preparation method according to claim 1, characterized in that: The curing agent slurry in step (2) is a mixture of water and curing agent, the mass ratio of which is 1:1; the curing agent is composed of 1 part of calcium-based activator, 1 part of cement and 5 parts of mineral powder; the specific gravity of the slurry is adjusted to 1.5-1.
7.
7. The preparation method according to claim 1, characterized in that: The mixing pile and jet-jet pile solidification slurry production system in step (2) comprises a mixing barrel, a silo, a weighing system, a mixing and stirring box, a mud storage box and a stirring head; the outlet of the silo is connected to the inlet of the mixing barrel; a stirring head is provided in the mixing barrel; the inlet of the mixing and stirring box is respectively connected to the outlets of the mixing barrel and the mud storage box; a stirring head is provided in the mixing and stirring box; and the bottom of the mud storage box is connected to the weighing system.
8. The preparation method according to claim 1, characterized in that: The silo and the mixing barrel are also connected to weighing systems respectively. The mixing pile and rotary jet pile solidifying slurry production system in step (2) controls the silo weighing system in the engineering waste slurry pretreatment system. The weighing system in the silo weighs the water and the curing agent respectively, adds them to the mixing barrel and stirs them evenly to make the curing agent slurry; the weighing systems in the mixing barrel and the mud storage box weigh the curing agent slurry and the soil slurry respectively, add them to the mixing box, and the mixing head in the mixing box stirs them evenly to make the solidifying slurry for preparing mixing piles and rotary jet piles.
9. The preparation method according to claim 1, characterized in that: The solidified slurry used to prepare the mixing piles and rotary jet piles in step (3) is pumped by a high-pressure pump and directly used in the on-site mixing pile and rotary jet pile construction.
10. The solidified slurry prepared based on engineering waste slurry obtained by the preparation method according to any one of claims 1 to 9.