CN115193861A - Tunnel hole slag in-situ recovery processing system and processing method - Google Patents
Tunnel hole slag in-situ recovery processing system and processing method Download PDFInfo
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- CN115193861A CN115193861A CN202210546392.6A CN202210546392A CN115193861A CN 115193861 A CN115193861 A CN 115193861A CN 202210546392 A CN202210546392 A CN 202210546392A CN 115193861 A CN115193861 A CN 115193861A
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- 239000002893 slag Substances 0.000 title claims abstract description 134
- 238000012545 processing Methods 0.000 title claims abstract description 41
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 38
- 238000011084 recovery Methods 0.000 title claims abstract description 15
- 238000003672 processing method Methods 0.000 title abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 75
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- 239000004567 concrete Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 23
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims description 82
- 239000004575 stone Substances 0.000 claims description 46
- 239000000843 powder Substances 0.000 claims description 38
- 239000000428 dust Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 28
- 238000005406 washing Methods 0.000 claims description 23
- 239000002351 wastewater Substances 0.000 claims description 23
- 239000002912 waste gas Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 20
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
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- 238000000926 separation method Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
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- 238000004065 wastewater treatment Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000011376 self-consolidating concrete Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/38—Stirring or kneading
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a tunnel hole slag in-situ utilization technology, in particular to a tunnel hole slag in-situ recovery processing system and a processing method. Considering that the geographic positions of a plurality of existing tunnel projects are relatively deviated, a large amount of manpower and material resources are consumed for transporting the tunnel hole slag to a slag abandoning field for off-site treatment, the construction cost is further increased, the tunnel hole slag is mainly sandstone materials and can be used as materials for preparing tunnel supporting concrete, and therefore the tunnel hole slag in-situ recycling treatment system is designed and arranged at a tunnel construction position, the tunnel hole slag sorting treatment system and the supporting material preparation system are organically combined, waste slag generated in the building process is sequentially treated through the two systems, and in-situ treatment and resource utilization of solid waste are achieved. The disposal risk of tunnel hole slag in the construction process of the mountain tunnel is reduced, the problem of scarcity of concrete raw materials in the construction process of the mountain tunnel is relieved, and the development of mountain tunnel construction to greenization, safety and energy conservation is promoted.
Description
Technical Field
The invention relates to a tunnel cave slag in-situ treatment and utilization technology, in particular to in-situ treatment and resource utilization of solid wastes such as cave slag in a tunnel, and simultaneously comprises the recycling and treatment of waste water and waste gas generated in the process of treating the cave slag, and particularly relates to a tunnel cave slag in-situ recycling treatment system and a treatment method.
Background
At present, the total mileage of high-speed rails and the total mileage of expressways in China are the first place in the world, and the infrastructure construction in China has drawn attention in the world. The construction of a comprehensive transportation system of China is accelerated gradually since the development and the opening of China, a traffic network is improved day by day, the length of a traffic line is multiplied along with the modern construction, and a high-speed rail network with four longitudinal lines and four transverse lines is formed.
A large amount of tunnel hole slag is generated in the construction process of the mountain tunnel, hundreds of millions of tunnel hole slag are generated in railway tunnel engineering according to statistics, and the excavated stone waste slag belongs to solid waste. The tunnel slag is generally stacked in a slag disposal field around a construction site, most of mountain tunnels are located in mountainous and hilly areas, geological disasters such as water and soil loss, mountain landslides and the like can be caused by directly stacking and treating the tunnel slag, and the stacked tunnel slag can influence the local ecological environment and pollute the underground water or drinking water of a water quality conservation zone.
After the tunnel is excavated, the original balance of the stratum around the tunnel is damaged, and the tunnel is deformed or collapsed. In order to protect the stability of the surrounding rock and ensure driving safety, the tunnel must have a supporting structure of sufficient strength, i.e. a tunnel lining. Common tunnel lining materials are: concrete and reinforced concrete, stone slab concrete, stone aggregate or concrete precast blocks, shotcrete, and the like. The tunnel hole slag is mainly sand and stone materials and can be used as a material for preparing tunnel supporting concrete, cliff cliffs are mostly arranged around part of tunnel engineering, the tunnel waste slag is not suitable for being piled in a waste slag field or being processed outside the field, and the current railway construction has extremely high requirements on environmental protection; therefore, a green, safe and reasonable tunnel cave slag disposal method is urgently needed to be found.
Disclosure of Invention
The invention aims to overcome the defect that the application rate of the tunnel waste slag in the prior art is low, and provides a tunnel hole slag in-situ recovery processing system and a tunnel hole slag in-situ recovery processing method.
In order to achieve the above purpose, the invention provides the following technical scheme:
a tunnel hole slag in-situ recovery processing system comprises a hole slag sorting processing system and a support material preparation system;
the hole slag sorting and processing system comprises a hole slag sorting component and a hole slag processing component, wherein the hole slag sorting component is used for sorting hole slag raw materials into 3 types according to the particle size; the hole slag processing assembly is used for processing and recycling hole slag raw materials with different particle sizes;
the supporting material preparation system is used for mixing the hole slag raw material with the specific particle size in the hole slag processing assembly with cement mortar in proportion to prepare a concrete raw material.
The invention provides a tunnel cave slag in-situ recycling system, which is designed based on the tunnel cave slag in-situ recycling system, is arranged at a tunnel construction site, organically combines a cave slag sorting system and a support material preparation system, sequentially processes waste slag generated in the construction process through the two systems, realizes in-situ processing and tunnel utilization of solid waste, not only carries out in-situ processing and utilization of tunnel cave slag, but also carries out recycling processing and utilization of waste water and waste gas generated in the cave slag processing process, reduces the risk of tunnel cave slag in the tunnel construction process, relieves the problem of development of green and energy-saving tunnel construction materials, and promotes the development of tunnel scarcity materials to the original energy-saving and energy-saving tunnel construction.
As a preferred technical scheme of the present invention, the cave slag sorting component comprises a first sorting device and a second sorting device, wherein the first sorting device is used for processing original cave slag aggregates, and the cave slag aggregates are classified into four types according to particle diameters:
the grain diameter range of the hole slag aggregate is more than 40mm;
coarse aggregate raw material with the particle size range of 5-40mm;
fine aggregate raw material (machine-made sand) with the particle size range of 0.16-5mm;
stone powder with the particle size range of less than 0.16mm;
and the second sorting device is used for screening the hole slag aggregate intermediate material to obtain a coarse aggregate raw material, a fine aggregate raw material and stone powder.
The first sorting device is used for screening initial hole slag, and a large part of hole slag raw materials are not effectively processed, namely hole slag aggregate intermediate materials. In the process, the proportion of the machine-made sand raw material and the mineral admixture raw material is less, and the rest is a coarse aggregate raw material; in the coarse aggregate raw material, the machine-made sand raw material and the mineral admixture raw material with larger specific gravity are not effectively separated, so secondary separation is needed;
the second sorting device is used for fine screening, and after the coarse aggregate raw material screened out in the first time is crushed and made into sand, the mineral admixture raw material (namely stone powder) and the made machine-made sand are separated out through the device; the stone powder and the machine-made sand in the batch are recycled and applied after being shaped. In the batch treatment process, after a larger part of coarse aggregate raw materials in the previous stage are subjected to secondary sorting treatment, machine-made sand and stone powder are further obtained.
As the preferred technical scheme of the invention, the hole slag processing assembly comprises a crushing device, a sand washing device and a shaping device;
the crushing device comprises a crusher and a sand making machine, the crusher is arranged between the first sorting device and the second sorting device, and the crusher is used for crushing the hole slag aggregate intermediate material until the particle size is not more than 40mm; the sand making machine is used for preparing a coarse aggregate raw material into a fine aggregate raw material; and when the hole slag aggregate intermediate material is crushed in the crusher, separating the raw materials with different particle size ranges by the second separation device, and then further performing sand making treatment on the coarse aggregate raw material according to the requirement.
The sand washing device is used for carrying out sand washing treatment on the fine aggregate raw material;
and the shaping device is used for rounding and air-drying the coarse aggregate after sand washing treatment.
The shaping device, the crushing device and the sand washing device which are matched and correspond to each other in two-stage separation can carry out maximum classification and recovery on the hole slag raw materials.
Starting from the general direction of energy conservation and emission reduction, in the process of tunnel construction, materials and waste water generated in each link are recycled as much as possible, and waste water after machine-made sand cleaning is finished by a sand washer is connected to a waste water and waste gas treatment device through a pipeline for treatment and utilization.
As the preferred technical scheme of the invention, the cave slag processing assembly also comprises a dust removal system and a waste water and gas treatment device;
the dust removal system comprises a plurality of atomizing and dust removing nozzles, the atomizing and dust removing nozzles are arranged in a corresponding mode according to the flying dust distribution area on the hole slag sorting assembly, and the atomizing and dust removing nozzles are communicated with one another through pipelines.
Specifically, the waste water and waste gas treatment device comprises a shell, an axial flow fan and a settling platform; the bottom of the shell is provided with an inclined plate, the side wall of the shell at the side of the inclined plate with the upper part is provided with a water inlet, and the side wall of the shell at the lower side of the inclined plate is provided with a water outlet; the inclined plate is provided with a stepped settling platform, and the axial flow fan is used for enabling muddy water entering the shell to transmit vibration waves to the direction of the lower step.
As a preferable technical scheme, the pipelines are arranged at intervals along the hole slag sorting component, each pipeline vertically arranged at the same position comprises at least two atomizing and dust removing nozzles, and the atomizing and dust removing nozzles can swing left and right along a horizontal axis.
As a preferred technical scheme of the invention, the wastewater treatment system comprises an activated carbon adsorption device, at least one filter plate;
the filter set up in on the settling station, the filter includes first filter and the second filter that the interval set up, the aperture of first filter is greater than the second filter, the filter to the outlet slope sets up.
As the preferred technical scheme of the invention, one side of the water inlet of the shell is communicated with the sand washing device through a drain pipe, and the water outlet of the shell is communicated with the dust removal system through a circulating water pipe. By making a pair
As the preferred technical scheme of the invention, the support material preparation system comprises a dry material premixing device, a mortar mixer and a concrete mixer; the dry material premixing device is used for mixing specific supporting materials according to different supporting structures in the tunnel.
A tunnel slag in-situ recovery processing method, which uses the tunnel slag in-situ recovery processing system,
the method specifically comprises the following steps:
s1: firstly, carrying out primary sorting treatment on original tunnel slag aggregates excavated from a tunnel in a first sorting device, and sorting out first-batch aggregates according to different particle sizes and physicochemical properties;
s2: crushing the hole slag aggregate intermediate material in the first batch of aggregates, and then introducing the crushed hole slag aggregate intermediate material into a second sorting device for secondary sorting to obtain a second batch of aggregates;
s3: gathering the stone powder in the first batch of aggregate and the second batch of aggregate to a special stone powder storage tank;
after the machine-made sand in the first batch of aggregates and the second batch of aggregates is washed in a sand washing device, the machine-made sand is sent into a shaping device for processing and then is stored in a special machine-made sand storage tank; the treated wastewater is sent into a wastewater and waste gas treatment device for treatment;
collecting the coarse aggregate raw materials in the first batch of aggregates and the second batch of aggregates to a special coarse aggregate storage tank for later use;
s4: the stone powder, the coarse aggregate and the machine-made sand are mixed into the cement according to different supporting structures in the tunnel to prepare mortar or concrete for use.
As a preferred technical solution of the present invention, the supporting structure includes three types: the method comprises the following steps of (1) preparing a forepoling structure, a temporary supporting structure and a primary supporting structure, wherein stone powder is used for preparing a concrete raw material used by the forepoling structure;
the coarse aggregate raw material and the machine-made sand are used for preparing corresponding concrete raw materials in the temporary supporting structure and the primary supporting structure.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a system for in-situ recycling treatment of tunnel cave residues, which is arranged at a tunnel construction position, organically combines a cave residue sorting treatment system and a support material preparation system, and sequentially treats waste residues generated in a construction process through the two systems, so that in-situ treatment and resource utilization of solid wastes are realized, tunnel cave residues are subjected to in-situ treatment and utilization, and meanwhile, waste water and waste gas generated in the cave residue treatment process are recycled, the disposal risk of the tunnel cave residues in the mountain tunnel construction process is reduced, the problem of scarcity of concrete raw materials in the mountain tunnel construction process is relieved, and the development of the mountain tunnel construction to greenization, safety and energy conservation is promoted.
2. The system for in-situ recycling of tunnel hole slag can classify the tunnel hole slag and utilize the tunnel hole slag as required. The coarse aggregate raw material, the machine-made sand and the stone powder can be used for preparing corresponding concrete raw materials in the temporary supporting structure and the primary supporting structure. Meanwhile, in the process of preparing the forepoling structure, the raw material of the machine-made sand can be replaced by the equal mixing amount of stone powder. Not only can not reduce supporting construction's parameter, very big accomplished resource recovery and utilized.
3. In the tunnel hole slag in-situ recovery treatment system, the generated wastewater can be used for recovering water used as dust removal spray after being treated by a special wastewater treatment device; on the other hand, the treated water can also be used for primary sand washing of a sand washing device.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of the in-situ recycling system for tunnel slag of the present invention;
FIG. 2 is a schematic view of the working flow of the tunnel slag sorting system of the present invention;
FIG. 3 is a simplified schematic diagram of a wastewater and waste gas treatment plant according to the present invention;
FIG. 4 is a schematic structural view of the atomizing dust-removing nozzle of the present invention;
the labels in the figure are:
100-a hole slag sorting treatment system and 200-a support material preparation system;
1-a first sorting device, 2-a second sorting device, 3-a crushing device, 4-a sand washing device, 5-a shaping device, 6-a dust removing system, 61-an atomization dust removing nozzle, 62-a pipeline, 7-a waste water and waste gas treatment device, 71-a shell, 72-a settling platform, 73-an axial flow fan, 74-a filter plate, 75-a water inlet, 76-a water outlet, 8-a dry material premixing device, 9-a mortar mixer and 10-a concrete mixer.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter of the present invention is not limited to the following examples, and any technique realized based on the contents of the present invention is within the scope of the present invention.
Example 1
A tunnel cave slag in-situ recovery processing system is shown in figure 1-2 and comprises a cave slag sorting processing system 100 and a support material preparation system 200;
the hole slag sorting and processing system 100 comprises a hole slag sorting component and a hole slag processing component, wherein the hole slag sorting component is used for sorting hole slag raw materials into 3 types according to the particle size; the hole slag processing assembly is used for processing and recycling hole slag raw materials with different grain sizes; the supporting material preparation system 200 is used for mixing the hole slag raw material with the specific particle size in the hole slag processing assembly with cement mortar in proportion to prepare a concrete raw material.
Specifically, the supporting material preparation system 200 includes: a dry material premixing device 8, a mortar stirring device 9 and a concrete stirring device 10.
Specifically, the cave sediment sorting assembly comprises a first sorting device 1 and a second sorting device 2, wherein the first sorting device 1 is used for processing original cave sediment aggregates and is divided into four types according to particle diameters: the grain size range of the hole slag aggregate intermediate material is more than 40mm; coarse aggregate raw material with the particle size range of 5-40mm; fine aggregate raw material (machine-made sand) with the particle size range of 0.16-5mm; stone powder with the particle size range of less than 0.16mm; and the second sorting device is used for screening the hole slag aggregate intermediate material to obtain a coarse aggregate raw material, a fine aggregate raw material and stone powder.
The first sorting device 1 is used for screening the original cave slag aggregate, and a larger part of cave slag raw materials are not effectively processed, namely, cave slag aggregate intermediate materials, in the process, the proportion of machine-made sand raw materials and mineral admixture raw materials is smaller, and the rest part of the cave slag aggregate intermediate materials are coarse aggregate raw materials; in the coarse aggregate raw material, the machine-made sand raw material and the mineral admixture raw material with larger specific gravity are not effectively separated, so secondary separation is needed;
the second sorting device 2 is used for fine screening, and after the coarse aggregate raw material screened out for the first time is crushed and made into sand, the mineral admixture raw material (namely stone powder) and the made machine-made sand are separated out through the device; the stone powder and the machine-made sand in the batch are recycled and applied after being shaped.
The hole slag processing assembly comprises a crushing device 3, a sand washing device 4 and a shaping device 5;
the crushing device 3 comprises a crusher 31 and a sand making machine 32, the crusher 31 is arranged between the first sorting device 1 and the second sorting device 2, and the crusher 31 is used for crushing the hole slag aggregate intermediate material until the particle size is not more than 40mm; the sand making machine 32 is used for preparing the coarse aggregate raw material into a fine aggregate raw material; and when the hole slag aggregate intermediate material is crushed in the crusher, separating the raw materials with different particle size ranges by a second sorting device, and further performing sand making treatment on the coarse aggregate raw material according to the requirement.
The sand washing device 4 is used for carrying out sand washing treatment on the fine aggregate raw material;
and the shaping device 5 is used for rounding and air-drying the coarse aggregate after sand washing treatment.
The shaping device 5, the crushing device 3 and the sand washing device 4 which correspond to the two-stage separation and matching can carry out maximum classification and recovery on the hole slag raw materials.
The cave slag processing assembly also comprises a dust removal system 6 and a waste water and waste gas processing device 7;
dust pelletizing system 6 includes a plurality of atomizing dust removal shower nozzle 61, and is a plurality of atomizing dust removal shower nozzle 61 is according to fly ash distribution area corresponds the setting on the subassembly is selected separately to the hole sediment, and is a plurality of atomizing dust removal shower nozzle communicates each other through the pipeline. Specifically, the pipeline along the subassembly interval sets up is selected separately to the hole sediment, and every of vertical setting on the same position includes two at least atomizing dust removal shower nozzles 61 on the pipeline, atomizing dust removal shower nozzle 61 can follow the horizontal axis horizontal hunting.
Specifically, the waste water and gas treatment device 7 comprises a shell 71, an axial flow fan 73 and a settling platform 72; a stepped settling platform 72 is arranged in the shell, and the axial flow fan 73 is used for enabling muddy water entering the shell 71 to transmit vibration waves to the direction of the lower step. The wastewater treatment system comprises an activated carbon adsorption device, at least one filter plate 74; the filter 74 sets up in on the settling platform 72, the filter 74 includes first filter and the second filter that the interval set up, the aperture of first filter is greater than the second filter, the filter 74 to the outlet 76 slope sets up. The filter plate 74 can block and adsorb more than 70% of silt in the wastewater, and settle on a settling platform.
One side of the water inlet of the shell 71 is communicated with the sand washing device 4 through a sewage discharge pipe, and the water outlet 76 of the shell 71 is communicated with the dust removal system through a circulating water pipe. A liquid level sensor and a controller are arranged in the shell 71, the liquid level sensor is electrically connected with the controller, and the liquid level sensor is used for feeding back the height of liquid entering the shell.
The liquid level sensor is in the prior art and is in a model of QDY30A-N.
The inlet 75 and the outlet 76 of the housing 71 are respectively provided on two opposite side walls. The water inlet 75 is located at one side of the upper step, and the water outlet 76 is located at one side of the lower step.
Example 2
The invention provides an in-situ recycling treatment method for tunnel cave slag, in particular to an in-situ recycling treatment system for tunnel cave slag, which is used in embodiment 1 and comprises the following specific steps:
s1: firstly, carrying out primary sorting treatment on original tunnel slag aggregates excavated from a tunnel in a first sorting device, and sorting out first-batch aggregates according to different particle sizes and physicochemical properties;
s2: crushing the hole slag aggregate intermediate material in the first batch of aggregates, and introducing the crushed hole slag aggregate intermediate material into a second sorting device for second sorting to obtain a second batch of aggregates;
s3: gathering stone powder in the first batch of aggregate and the second batch of aggregate to a stone powder special storage tank;
after the machine-made sand in the first batch of aggregates and the second batch of aggregates is washed in a sand washing device, the machine-made sand is sent into a shaping device for processing and then is stored in a special machine-made sand storage tank; the treated wastewater is sent into a wastewater and waste gas treatment device for treatment;
collecting the coarse aggregate raw materials in the first batch of aggregates and the second batch of aggregates to a coarse aggregate special storage tank for later use;
s4: according to different supporting structures in the tunnel, stone powder, coarse aggregate and machine-made sand are mixed into cement to prepare mortar or concrete for use.
The supporting construction includes three kinds: the stone powder is used for preparing a concrete raw material used by the advance support structure; the coarse aggregate raw material and the machine-made sand are used for preparing corresponding concrete raw materials in the temporary supporting structure and the primary supporting structure.
In the process of treating the hole slag, limestone powder and other mixing amounts are adopted to replace the use of the machine-made sand in the self-compacting concrete, and the influence of 0-20% of limestone powder mixing amount and other mixing amounts on the working performance of the C50 and C30 machine-made sand self-compacting concrete is researched.
The workability of machine-made sand concrete changed significantly as the stone dust content increased from 0% to 20% in the machine-made sand. As the stone dust content increases, both slump and slump experience a tendency to increase and then decrease. Wherein, the slump and the expansion degree of the C30 machine-made sand concrete reach the maximum when the content of the stone powder is 16 percent, the maximum values are 239mm and 553mm respectively, and the slump and the expansion degree of the C30 machine-made sand concrete are reduced to 202mm and 528mm when the content of the stone powder is 20 percent. Whereas slump and slump of C50 machine-made sand concrete reach maximum values at around 12% stone dust content, at 262mm and 570mm respectively, and then decrease to levels already lower than 0% stone dust content at 20% stone dust content. In the test process, the concrete is found to be very viscous when the stone powder content reaches 20 percent, and the workability is greatly reduced. Therefore, depending on the type of the machine-made sand, when the amount of the stone powder is replaced by the amount of the stone powder, it is necessary to mix and stir the mixture strictly in the above-described optimum ratio.
Further, in the recovery processing method of the invention, the influence of the stone powder on the strength of the machine-made sand concrete is also researched:
compared with river sand concrete, the machine-made sand concrete has the advantages that the strength of C30 concrete and C50 concrete 28d is respectively changed into 1% and +7%;
compared with the mixing amount of 0% of stone powder, when the mixing amount of the stone powder is 4%, 8%, 12%, 16% and 20%, the compression strength of the C50 concrete 28d is respectively changed into +10%, +3%, +5%, +7%, +6%; the C30 concrete 28d has compressive strength changes of +6%, +20%, +16%, +19%, +17%, respectively.
The durability of the stone powder-machine-made sand concrete is researched as follows:
6-hour electric flux: the larger the mixing amount of the stone powder is, the lower the electric flux of the machine-made sand concrete is. When the mixing amount of the stone powder is 0-12%, the electric flux of the machine-made sand concrete is higher than that of river sand concrete; the stone powder mixing amount is 16-20%, and the electric flux of the machine-made sand concrete is lower than that of river sand concrete.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The in-situ recycling and treating system for tunnel hole slag is characterized in that:
comprises a hole slag sorting processing system (100) and a support material preparation system (200);
the hole slag sorting and processing system (100) comprises a hole slag sorting component and a hole slag processing component, wherein the hole slag sorting component is used for sorting hole slag raw materials into three types according to particle sizes; the hole slag processing assembly is used for processing and recycling hole slag raw materials with different particle sizes;
the supporting material preparation system (200) is used for mixing the hole slag raw material with the specific particle size in the hole slag treatment assembly with cement and water in proportion to prepare a concrete raw material.
2. The in-situ recycling treatment system for tunnel cave slag according to claim 1,
the hole slag sorting component comprises a first sorting device (1) and a second sorting device (2),
the first sorting device (1) is used for processing original hole slag aggregates and is divided into four types according to particle diameters:
the grain diameter range of the hole slag aggregate is more than 40mm;
coarse aggregate raw material with the particle size range of 5-40mm;
fine aggregate raw material with the particle size range of 0.16-5mm;
stone powder with the particle size range of less than 0.16mm;
and the second sorting device (2) is used for screening the hole slag aggregate intermediate material to obtain a coarse aggregate raw material, a fine aggregate raw material and stone powder.
3. The in-situ recycling and processing system for tunnel cave slag, according to claim 2, is characterized in that the cave slag processing assembly comprises a crushing device (3), a sand washing device (4) and a shaping device (5);
the crushing device (3) comprises a crusher and a sand making machine, the crusher is arranged between the first sorting device (1) and the second sorting device (2), and the crusher is used for crushing the hole slag aggregate intermediate material until the particle size is not more than 40mm; the sand making machine is used for preparing the coarse aggregate raw material into the fine aggregate raw material;
the sand washing device (4) is used for carrying out sand washing treatment on the fine aggregate raw material;
and the shaping device (5) is used for rounding and air-drying the coarse aggregate after sand washing treatment.
4. The in-situ recycling treatment system for tunnel cave slag according to claim 3, characterized in that the cave slag treatment assembly further comprises a dust removal system (6) and a waste water and waste gas treatment device (7);
dust pelletizing system (6) include a plurality of atomizing dust removal shower nozzle (61), and is a plurality of atomizing dust removal shower nozzle (61) basis fly ash distribution region corresponds the setting on the subassembly is selected separately to the hole sediment, and is a plurality of atomizing dust removal shower nozzle (61) communicate each other through pipeline (62).
The waste water and waste gas treatment device (7) comprises a shell (71), an axial flow fan (73) and a settling platform (72); the bottom of the shell (71) is provided with a stepped settling platform (72), and the axial flow fan (73) is used for enabling muddy sand water entering the shell (71) to transmit vibration waves to the direction of a lower step.
5. The in-situ tunnel cave slag recovery and treatment system according to claim 4, wherein the pipelines (62) are arranged at intervals along the cave slag sorting assembly, each pipeline (62) vertically arranged at the same position comprises at least two atomizing and dust-removing nozzles (61), and the atomizing and dust-removing nozzles (61) can swing left and right along a horizontal axis.
6. The in-situ recycling treatment system for tunnel cave slag according to claim 4, characterized in that the waste water and waste gas treatment device (7) comprises an activated carbon adsorption device, at least one filter plate (74);
the filter plates (74) are arranged on the settling platform (72), the filter plates (74) comprise first filter plates and second filter plates which are arranged at intervals, the aperture of each first filter plate is larger than that of each second filter plate, and the filter plates (74) are arranged in an inclined mode;
the shell is provided with a water inlet and a water outlet, the water inlet and the water outlet are positioned on the diagonal line of the shell, and the filter plate (74) inclines towards one side of the water outlet.
7. The in-situ recycling treatment system for tunnel cave slag according to claim 4, characterized in that one side of the water inlet of the shell (71) is communicated with the sand washing device (4) through a sewage discharge pipe, and the water outlet of the shell (71) is communicated with the dust removal system (6) through a circulating water pipe.
8. The in-situ recycling treatment system for tunnel cave slag according to claim 4, characterized in that the supporting material preparation system (200) comprises a dry material premixing device (8), a mortar mixer (9) and a concrete mixer (10); the dry material premixing device (8) is used for mixing specific supporting materials according to different supporting structures in the tunnel.
9. An in-situ recycling treatment method for tunnel cave slag, which is characterized in that the in-situ recycling treatment system for tunnel cave slag as claimed in any one of claims 1 to 8 is used, and comprises the following steps:
s1: firstly, primary sorting treatment is carried out on original tunnel slag aggregates excavated from a tunnel through a first sorting device, and first batches of aggregates are screened according to different particle sizes and physicochemical properties;
s2: crushing the hole slag aggregate intermediate material in the first batch of aggregates, and introducing the crushed hole slag aggregate intermediate material into a second sorting device for second sorting to obtain a second batch of aggregates;
s3: gathering the stone powder in the first batch of aggregate and the second batch of aggregate to a special stone powder storage tank;
after the machine-made sand in the first batch of aggregates and the second batch of aggregates is washed in a sand washing device, the machine-made sand is sent into a shaping device for processing and then is stored in a special machine-made sand storage tank; the treated wastewater is sent into a wastewater and waste gas treatment device for treatment;
collecting the coarse aggregate raw materials in the first batch of aggregates and the second batch of aggregates to a special coarse aggregate storage tank for later use;
s4: the stone powder, the coarse aggregate and the machine-made sand are mixed into the cement according to different supporting structures in the tunnel to prepare mortar or concrete for use.
10. The in-situ recycling treatment method for tunnel cave slag according to claim 9,
the supporting construction includes three kinds: the stone powder is used for preparing a concrete raw material used by the advance support structure;
the coarse aggregate raw material and the machine-made sand are used for preparing corresponding concrete raw materials in the temporary supporting structure and the primary supporting structure.
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