CN217233504U - A mud-water separation regeneration system for slurry shield constructs - Google Patents

Abstract

The utility model discloses a mud-water separation regeneration system for slurry shield belongs to shield construction technical field. A mud-water separation regeneration system for slurry shield includes: the mud water treatment system: carrying out mud-water separation, recovery, slurry preparation and filter pressing; a muddy water circulating component: the slurry treatment system is communicated with the shield slurry cabin to convey new slurry and old slurry, and the shield slurry cabin consists of a slurry feeding and discharging pump and a slurry feeding and discharging pipe. The utility model discloses creatively carries out secondary separation regeneration with dregs, the mud that the mud-water separation subassembly sieves out, effectively reduces the wasting of resources, rationally practices thrift construction cost, ensures the most guaranteed economic benefits of dregs regeneration.

Description

A mud-water separation recycle system for slurry shield constructs

Technical Field

The utility model relates to a shield constructs construction technical field, especially relates to a mud-water separation regeneration system for slurry shield constructs.

Background

The slurry balance shield machine has good stratum adaptability, and can adapt to various clays, sandy soil, gravels, hard soil and composite stratum formed by the soil layers; particularly, when the slurry shield passes through rivers and lakes, the slurry shield has a good pressure maintaining function. In the construction process of the slurry balance shield, new and old slurry needs to be alternately supplemented to the excavation surface of a shield cutter head; the preparation of new slurry and the treatment of old slurry need to be completed by special slurry treatment equipment. In the slurry shield construction process, the quality of slurry is ensured by a slurry treatment system; therefore, mud separation and treatment techniques are becoming increasingly important. Meanwhile, in construction, different stratums have different requirements on parameters of slurry, and the large specific gravity can reduce the slag carrying capacity and cause unqualified slurry.

The treatment of the slurry shield waste slurry is a difficult problem which puzzles the engineering construction for a long time; the existing slurry treatment method mostly adopts measures of direct discharge, dead weight precipitation outside a tank truck transportation field, natural drying, cement mixing solidification, lime slurry concentration and the like. These methods of waste sludge treatment have the following problems: (1) the special slurry treatment sites in cities are few, and the slurry treatment and discharge are difficult; (2) the waste slurry is transported out by a tank car, long-distance transportation is limited by municipal sanitation and the like, transportation time and transportation quantity are limited, transportation cost is high, and treatment efficiency is low; during construction peak, the outward transportation operation is difficult to match the construction progress, the outward transportation operation can only be stored in a sedimentation tank on site, a large amount of land is occupied, and newly discharged slurry cannot be continuously absorbed after a slurry tank is full, so that the shutdown of a construction site is caused, the construction progress is seriously influenced, and the construction cost is increased; (3) the method has the advantages that large environmental pollution is easily caused, the construction site environment is severe, waste slurry is easy to leak, and municipal pipelines can be blocked; (4) the mud contains alkaline substances, the waste mud at a special discharge site is difficult to be treated systematically, the mud cannot be used after being dried for secondary tillage, and the mud cannot be used for other purposes without being treated; (5) in the process of slurry transportation, the slurry is leaked on roads to influence the appearance of the cities and cause potential safety hazards of transportation due to the management and coordination problems of transportation vehicles.

Therefore, research on a mud-water separation and recycling technology is needed to realize zero emission of the mud-water shield.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving prior art, among the slurry shield construction, the problem of the long-term puzzlement engineering construction of mud treatment, and the mud-water separation regeneration system who is used for slurry shield that provides.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a mud-water separation regeneration system for slurry shield constructs's mud-water separation regeneration system, its characterized in that includes:

the mud water treatment system: carrying out mud-water separation, recovery, slurry preparation and filter pressing;

the muddy water circulation component: the slurry treatment system is communicated with the shield slurry cabin to convey new slurry and old slurry, and the shield slurry cabin consists of a slurry feeding and discharging pump and a slurry feeding and discharging pipe;

the muddy water treatment system comprises:

the mud-water separation component: the sand-slurry separation is carried out on the slurry discharged by the shield, and the external discarded slag is dehydrated, so that the method is suitable for direct transportation of a dump truck without slurry leakage;

preparing a slurry mixing component: recyclable sand, stone and liquid generated by the mud-water separation component and the filter pressing component are utilized, appropriate slurry is prepared by adopting slurry preparation and mixing equipment and is conveyed to the shield through the mud-water circulation component, and flow balance, material balance, circulation slurry adjustment and rapid compensation of shield circulation are realized;

a filter pressing component: and treating waste slurry generated by the mud-water separation component, performing filter pressing on mud cakes, and recycling the waste liquid.

Preferably, the mud-water separation component adopts pre-screening and primary and secondary cyclone separation to realize good separation of sand and slurry in the shield circulating slurry; the dewatering sieve is adopted for high-frequency vibration dewatering, so that the water content of the externally-discarded slag is less than or equal to 25 percent, and the method is suitable for direct transportation of a dump truck without slurry leakage;

the mud-water separation part comprises: the roughing device, the primary separation device and the secondary separation device are arranged in sequence;

the roughing device comprises: a clay block-slurry separator and a coarse screen are arranged in sequence;

the primary separation apparatus comprises: the primary cyclone and the primary dewatering screen are arranged in sequence;

the secondary separation apparatus comprises: the secondary cyclone and the secondary dewatering screen are arranged in sequence.

Preferably, the pulping and size mixing part comprises a pulping system and a size mixing system;

the pulping system consists of a new pulp preparation tank, a new pulp storage tank and a chemical agent storage tank;

the new slurry preparation tank is provided with an automatic slurry preparation assembly and communicated to the new slurry storage tank; the chemical agent storage tank is provided with a chemical agent preparation assembly and is communicated to the new slurry preparation tank and the new slurry storage tank;

the pulp conditioning system consists of a concentration tank, an adjusting tank, a clean water tank and a filtrate tank;

the inlet end of the concentration tank is communicated to the mud-water separation assembly, the outlet end of the concentration tank is communicated to the adjusting tank, and the fresh slurry storage tank is communicated to the adjusting tank;

the inlet end of the filtrate tank is communicated to the filter pressing assembly, and the outlet end of the filtrate tank is communicated to the clean water tank and the adjusting tank;

the clean water tank is communicated with the adjusting tank, the new slurry preparation tank, the new slurry storage tank and the chemical agent storage tank.

Preferably, the filter pressing assembly adopts filter pressing equipment to treat redundant waste slurry, and the waste liquid is recycled;

the press assembly comprises: a filter press and a stirring barrel;

the inlet end of the stirring barrel is communicated to a concentration tank of the slurry preparation and mixing system, a stirring device is arranged in the stirring barrel, the outlet end of the stirring barrel is communicated to a filter press through a diaphragm pump, and the filter press is connected to a filtrate tank.

Preferably, muddy water processing system locates ground, still includes:

and a comprehensive management part: and a PLC centralized control room is adopted for remote control, so that remote centralized control and real-time monitoring of the muddy water treatment system are realized.

Compared with the prior art, the utility model provides a mud-water separation regeneration system for slurry shield possesses following beneficial effect:

1. the utility model discloses, be arranged in high flood peak, large-traffic, the slurry shield muck that osmotic coefficient is big, geological conditions is complicated discharges smoothly, keeps excavation face muddy water storehouse to press stably, mud regeneration, carry out secondary separation regeneration with muck, the mud that mud-water separation subassembly sieves out innovatively.

2. The utility model is used for the synchronous grouting of the tunnel raw material after screening and cleaning the separated sand; pebbles are screened and cleaned and then are used for on-site construction; after the secondary adjustment of the waste slurry, the waste slurry is used for synchronously grouting raw materials and improving the earth pressure shield muck; effectively reduces the resource waste and reasonably saves the construction cost.

3. The utility model, through the research of mud-water separation and recycling technology, the fresh slurry is prepared in the fresh slurry preparation tank and is delivered to the adjusting tank, and the adjusting slurry is delivered to the shield mud water cabin through the slurry inlet pump and the slurry inlet pipeline; mud formed by mixing soil sand cut by the shield cutter head and mud water in the mud water cabin is sent to a ground mud water treatment system for separation through a mud discharge pump and a mud discharge pipeline; in the separation equipment, the slurry is subjected to coarse screening, primary treatment and secondary treatment to separate large particles, the bottom flow of the concentration tank is subjected to filter pressing treatment, and clear water is precipitated after residue and soil separation and is recycled; and performing synchronous shield grouting recycling on the filter-pressed muck and sand according to the test mixture ratio, so as to ensure that the muck recycling can ensure the economic benefit to the maximum extent.

Other advantages, objects, and features of the invention will be set forth in part in the description which follows; and will be apparent to those skilled in the art, to a certain extent, upon a study of the following; or may be learned by the practice of the invention.

Drawings

FIG. 1 is a schematic view of a mud-water separating portion.

FIG. 2 is a schematic view of a portion for preparing a slurry.

FIG. 3 is a schematic view of the press assembly.

Fig. 4 is a schematic view of the shield tunneling section.

FIG. 5 is a schematic flow chart of mud quality control.

FIG. 6 is a schematic diagram of the assembly connections for mud quality control.

In the figure:

100. externally discarding slag;

101. clay block-slurry separator; 102. coarse screening; 103. a primary swirler; 104. a first-stage dewatering screen; 105. a storage tank; 106. a secondary cyclone; 107. a secondary dewatering screen; 108. a slurry pump;

201. a filter press; 202. a stirring barrel; 203. a stirring device; 204. a diaphragm pump; 205. a filtrate tank; 206. an air compressor; 207. a gas storage tank; 300. a concentration tank;

301. a regulating pool; 302. a clean water tank;

401. a new slurry preparation tank; 402. a fresh pulp storage tank; 403. a chemical agent reservoir; 404. an automatic pulping assembly; 4041. an ejector; 405. a pulping material storehouse;

500. and (4) a densimeter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-6, the mud-water separation and recycling system for the slurry shield comprises a mud-water treatment system and a mud-water circulation assembly; on the premise of meeting the shield construction requirements, the shield structure plays the roles of saving resources and reducing discharge.

The mud water treatment system: carrying out mud-water separation, recovery, slurry preparation and filter pressing; comprises a mud-water separation component, a slurry preparation and mixing component and a filter pressing component.

The muddy water circulation component: the slurry treatment system is communicated with the shield slurry cabin to convey new slurry and old slurry, and the shield slurry cabin consists of a slurry feeding and discharging pump and a slurry feeding and discharging pipe.

A mud-water separation component: the slurry discharged by the shield is subjected to sand-slurry separation, and the discarded slag is dewatered by 100 degrees, so that the method is suitable for direct transportation of a dump truck without slurry leakage. Preparing a slurry mixing component: recyclable sand, stone and liquid generated by the mud-water separation component and the filter pressing component are utilized, appropriate slurry is prepared by adopting slurry preparation and mixing equipment, and flow balance, material balance, circulation slurry adjustment and rapid compensation of shield circulation are realized through the mud-water circulation component. A filter pressing component: and treating waste slurry generated by the mud-water separation component, performing filter pressing on mud cakes, and recycling the waste liquid.

Therefore, in the shield system, the muck generated by the slurry shield is discharged, and the slurry meeting the requirements is sent to the excavation surface through separation, recovery, slurry preparation and mixing and filter pressing; stabilizing the shield slurry sump by pressurizing the shield slurry sump, and conveying the residue soil by using a slurry discharge pipe; is a means for ensuring the stability of the working surface and discharging slag in the construction.

The muddy water treatment mode is closely related to model selection, tunneling speed, geological conditions and the like of the shield tunneling machine, and different muddy water treatment modes are determined by different machine types and geological conditions; according to the requirements of different stratums on the slurry, the main index parameters of the slurry, such as the density, the viscosity, the filtration loss and the like, of the slurry are adjusted in time so as to meet the requirement of matching with a shield tunneling machine for smooth tunneling.

The influence of slurry indexes on the construction of the slurry pressurizing shield mainly comprises the following three aspects:

(1) adjusting the pressure in the excavation bin and the water-soil combined pressure of the excavation surface to keep dynamic balance, and ensuring that the disturbance to the stratum is reduced to the minimum;

(2) after muddy water acts on the excavation surface, a layer of compact mud film is formed through pressure, the pressure in the bin can be ensured, and the stratum is stabilized;

(3) muddy water can carry dregs to the ground, and the continuity and the efficiency of construction are ensured.

Therefore, the treatment quality of the slurry after passing through the mud-water separation assembly is guaranteed to be very important.

The mud-water separation component adopts pre-screening and primary and secondary cyclone separation to realize good separation of sand and slurry in the shield circulating slurry; and the high-frequency vibration dehydration of the dehydration screen is adopted, the 100 percent of water content of the externally discarded slag is less than or equal to 25 percent, and the method is suitable for direct transportation of a dump truck without slurry leakage.

Wherein, the mud-water separation part includes: the device comprises roughing equipment, primary separation equipment and secondary separation equipment which are arranged in sequence.

The roughing device comprises: a clay block-slurry separator and a coarse screen 102 which are arranged in sequence.

For powdery clay existing in an engineering interval, the water content of dregs is very high in the traditional clay treatment process, the transportation is not facilitated, and the environmental pollution is very easy to cause. The clay block-slurry separator 101 has a remarkable effect on mud-water separation of a clay stratum, does not have the condition of mesh blockage, and has the advantages of large single-machine processing capacity, simple structural design and low operation and maintenance cost; the water content of the discharged slag is less than or equal to 25 percent, and the discharged slag can be directly transported.

A vibration screening machine is used as a coarse screen 102 for screening out particles larger than 2mm in the slurry; the water content of the residue soil is less than or equal to 25 percent, and the residue soil can be directly transported.

The primary separation apparatus comprises: a primary cyclone 103 and a primary dewatering screen 104 which are arranged in sequence.

And (3) conveying the residual slurry after the coarse screening 102 into a sand-mud separator consisting of a primary cyclone 103 in a pumping mode, and crushing and taking out particles of 2-0.074 mm in the slurry.

And the inclined vibrating dewatering screen is used as a primary dewatering screen 104 to dewater the particles until the water content is about 18-20%.

It is understood that the dehydrated product is stored in the storage tank 105.

The secondary separation device comprises: a secondary cyclone 106 and a secondary dewatering screen 107 which are arranged in sequence.

The slurry obtained after the primary cyclone 103 is pumped into an ultrafine particle recovery mechanism consisting of a secondary cyclone 106, and particles with the particle size of 0.074 mm-0.020 mm in the slurry are obtained.

And the ultrahigh frequency vibration dewatering screen is used as a secondary dewatering screen 107 to dewater the particles until the water content is about 22-25%.

It is understood that the dehydrated product is stored in the storage tank 105.

And for the filter pressing assembly, redundant waste slurry is treated by adopting filter pressing equipment, and the waste liquid is recycled.

Wherein, the filter pressing subassembly includes: a filter press 201 and a stirring barrel 202.

The inlet end of the mixing tank 202 is communicated to the concentration tank 300 of the slurry preparation and mixing system, the mixing device 203 is arranged in the mixing tank 202, the outlet end of the mixing tank 202 is communicated to the filter press 201 through the diaphragm pump 204, and the filter press 201 is connected to the filtrate tank 205.

The filter section of the filter press 201 is composed of a membrane filter plate and a chamber filter plate which are arranged in order on a main beam, and filter cloth which is clamped between the membrane filter plate and the chamber filter plate.

When the filtration starts, the waste slurry enters each filtration chamber through the feed inlets of the thrust plate and the compacting plate under the driving of the pump, the solid-liquid separation is carried out by the pressure generated by the feed pump, and the filtrate is discharged from the liquid outlet.

In a specific project implementation, the following data were obtained by evaluation.

And (3) carrying out thin film seed cultivation by using the filter pressing system at the average treatment capacity of the slurry per hour when the feeding proportion is 1.1-1.25 g/cm, and carrying out thin film seed cultivation by using the filter pressing system at the average treatment capacity of the slurry per hour, wherein the water content of the filter cake is about 30%. Averagely producing dry slag at an hour for carrying out the dry harvest; the solid content of the filtrate is less than 2g/l, and the filtrate can be directly discharged or recycled. The pressure filtration equipment can produce about 0.1m dry slag every minute, and 10min is required for producing 1m dry slag soil.

When the feeding proportion is 1.22-1.36 g/cm, the filter pressing system averagely processes about 44m of slurry every hour during the cultivation, and the water content of the filter cake is about 30%. Performing dry residue average production by about 9m each hour; the treatment effect is better than that when the specific gravity of the slurry is lower than 1.2g/cm for carrying out the high-speed plantation.

And for the slurry preparation and mixing part, a slurry preparation and mixing equipment slurry circulation component is adopted to realize flow balance, material balance and circulation slurry adjustment and rapid compensation of the shield circulation system.

The pulping and size mixing part comprises a pulping system and a size mixing system.

The pulping system consists of a new pulp preparation tank 401, a new pulp storage tank 402 and a chemical agent storage tank 403.

The new pulp preparation tank 401 is provided with an automatic pulping assembly 404, and the new pulp preparation tank

401 is communicated to a fresh pulp storage tank 402; the chemical agent storage tank 403 is provided with chemical agent preparation components and is communicated to the new slurry preparation tank 401 and the new slurry storage tank 402.

The size mixing system consists of a concentration tank 300, an adjusting tank 301, a clean water tank 302 and a filtrate tank 205.

The inlet end of the concentration tank 300 is communicated to the mud-water separation component, and the outlet end of the concentration tank 300 is communicated to the adjusting tank

301, a fresh slurry reservoir 402 is connected to the conditioning tank 301.

The inlet end of the filtrate tank 205 is communicated to the filter pressing assembly, and the outlet end of the filtrate tank 205 is communicated to the clean water tank 302 and the adjusting tank 301.

The clean water tank 302 is connected to the adjustment tank 301, the fresh pulp preparation tank 401, the fresh pulp storage tank 402, and the chemical agent storage tank 403.

The muddy water treatment system is arranged on the ground and further comprises:

and a comprehensive management part: and a PLC centralized control room remote control mode is adopted, so that remote centralized control and real-time monitoring of the ground muddy water system are realized.

Meanwhile, noise-proof treatment is set for the equipment, and the method specifically comprises the following steps.

(1) And (5) performing noise-proof treatment inside the equipment.

The muddy water treatment system mainly comprises components such as swirler, vibrating motor and screen cloth, pump, switch board. The equipment generates noise during operation, and lubricating grease is added to protect and reduce the noise of the equipment.

(2) And an external noise-proof unit of the equipment.

The external noise-proof unit of the equipment adopts a reinforced concrete structure or a steel structure board house. Through cost analysis and practicability investigation, professional teams are built in a manner of packaging materials, construction quality is guaranteed, and noise can be effectively reduced.

Wherein, the steel constructs the board house and includes purlin and rock wool board, skeleton, and equipment modularized design takes peripheral frame certainly, can be directly at equipment plus purlin and acoustic celotex board.

The system comprises the following steps of slurry discharge, separation, recovery, slurry mixing and slurry feeding.

S1, slurry discharge: mud formed by mixing the soil sand cut by the cutter and mud water in the mud water cabin is sent to a ground mud water treatment system through a mud discharge pump and a mud discharge pipeline of the mud water circulation part for separation.

S2, separation: in a mud-water treatment system, separating large particles, and returning the standard-reaching mud to the concentration tank 300; and, the underflow of the concentration tank 300 is subjected to filter pressing treatment.

S3, recovering: separating and filter-pressing the slag soil and the sand, and performing synchronous grouting and recycling on the shield by test mixture ratio; precipitating the clear water after filter pressing, and recycling; ensures the maximum recycling of the residue soil and the economic benefit.

S4, size mixing: fresh slurry is prepared in the fresh slurry tank at the mud station and delivered to the mud conditioning tank 301.

S5, pulp feeding: the adjustment slurry is conveyed to the shield slurry cabin through the slurry inlet pump and the slurry inlet pipeline.

Wherein, in step S2:

the water content of the slag discharged from the clay block-slurry separator 101 is less than or equal to 25 percent, and the slag can be directly transported;

the coarse screen 102 screens out particles larger than 2mm in the slurry; the water content of the residue soil is less than or equal to 25 percent, and the residue soil can be directly transported;

sending the residual slurry after coarse screening 102 into a sand-mud separator consisting of a primary cyclone 103 in a pumping mode, and crushing and taking out 2-0.074 mm particles in the slurry;

the inclined vibrating dewatering screen is used as a primary dewatering screen 104, and the particles are dewatered until the moisture content is about 18-20%;

the slurry after being extracted by the primary cyclone 103 is sent to an ultrafine particle recovery mechanism consisting of a secondary cyclone 106 by a pumping way, and 0.074 mm-0.020 mm particles in the slurry are extracted;

and the ultrahigh frequency vibrating dewatering screen is used as a secondary dewatering screen 107 to dewater the particles until the moisture content is about 22-25%.

In step S2, the method further includes improving the efficiency of filter pressing.

The quick lime and the cationic polyacrylamide are added into the waste slurry tank, so that the waste slurry is subjected to a great flocculation effect, and the filter pressing time is shortened.

Wherein, the calcium content of the quicklime reaches more than 80 percent, and the particle size is less than 200 meshes.

Tests show that the filter pressing time can be reduced by 10-20min each time, the filter pressing treatment capacity is obviously improved, and the filter pressing equipment investment is reduced.

In step S3:

respectively conveying the coarse sand, the medium sand and the fine sand with different particle sizes obtained in the step S2 to a storage yard for storage; the sandstone is submitted for inspection, can be used for synchronous grouting of a mixing station and concrete pouring of nearby buildings after meeting the requirements, and the sandstone with different particle size ranges can be used for the building industry, so that the effect of resource utilization of solid wastes is realized.

Wherein:

the separated sand is screened and cleaned for the second time, and the sand can be used for synchronous grouting raw materials and a concrete mixing station after being detected to be qualified; through carrying out secondary screening, washing to the stone of separation, the sample is used for concrete mix after detecting and is used, and the cobble in the different particle diameter scope can be used to the construction of building, realizes secondary separation recycle.

To ensure the availability of the material and its performance, sand screened by the vibrating screen was tested for post-grouting.

The backfill grouting material mainly comprises cement, fly ash, silty sand, bentonite (clay), water and an additive (water reducing agent); and (3) taking the silt and the fine sand after the mud-water separation as fine aggregates of the slurry.

1) The test instrument:

the testing instrument comprises a relative density instrument, a mortar consistency instrument, a measuring cylinder, a mortar setting time tester and an unconfined compressive strength tester.

In general, the slurry properties should meet the following requirements:

the slurry has good fluidity and is easy to pump; the pumpability is good within 6 hours, namely the mortar is uniform and stable, and the fluidity is between 200mm and 250 mm; the pumpability is still realized within 8 hours, and the fluidity is about 190 mm;

the slurry has good stability, is not separated and is not easy to be diluted by underground water; the bleeding rate is not more than 3%;

thirdly, the slurry is solidified and hardened as soon as possible after being injected into the gap, the early strength of the slurry is approximately equal to that of undisturbed soil, and the 7d strength is more than 0.3 MPa;

fourthly, the condensation time is 6 to 12 hours;

the slurry should have a proper consistency and not be easily diluted by groundwater, and the consistency is between 10.5 and 12.

The most important is the characteristics of filling property, fluidity, no loss to the region outside the shield tail and the like, and the key point for realizing the aim of the backfill grouting is to meet the characteristics.

2) The test protocol was as follows:

in order to facilitate the development of the test and highlight the key point, a fixed wall post-grouting formula is formulated on the basis of the post-grouting adopted by the existing shield construction, and the setting time, the fluidity and the strength of the slurry are measured as shown in the following table.

The slurry mix is shown in the table.

P.O42.5 Cement (kg)	I Bentonite (kg)	II fly ash (kg)	Sand (kg)	Water (kg)	Additive agent
						140	65	350	360	500	Adding according to the test as required

TABLE 1 original synchronous grouting material proportioning table

P.O42.5 Cement (kg)	I Bentonite (kg)	II fly ash (kg)	Sand (kg)	Water (kg)	Mud (kg)
						160	0	280	360	0	1000

TABLE 2-adjusted proportioning table for synchronous grouting material

3) And (3) test results:

along with the increase of the content of the soil-sand ratio, the content of the sand in the slurry is continuously reduced, and correspondingly, the content of other materials is also continuously reduced, so that the density is correspondingly reduced, and the density is maintained at 2.025-1.85 g/cm ³ And the filling requirement of shield construction on the slurry is basically met.

The fluidity, setting time and strength of the slurry can meet the requirements by measuring the mixing ratio of different slurries. The prepared slurry for the wall postgrouting has a good formula effect, meets the construction requirements of a shield on the slurry for the wall postgrouting, and indicates that the sand discard in the shield construction can be completely used for the slurry for the wall postgrouting.

In step S3, the method further includes:

(1) and (4) regenerating and utilizing the slurry.

The slurry after the mud-water separation part treatment enters a concentration tank 300 for reuse after the viscosity, the specific gravity, the sand content and the qualification are detected on site.

Adding a certain amount of clay, CMC and clear water into the adjusting tank 301 according to a certain proportion, and mixing to prepare new mud suitable for the characteristics of the stratum; the slurry is pumped into a shield slurry chamber by a slurry pump, and the redundant slurry is stored in an adjusting tank 301.

When the mud in the adjusting tank 301 is insufficient, the automatic pulping component 404 can be directly started to prepare the mud, and the pulping material is mainly bentonite and is supplemented by other materials such as CMC, soda and the like; after being fully stirred, the pulp enters a new pulp storage tank 402 after being puffed for 24 hours.

The mud treated in the concentration tank 300 mainly comprises bentonite, the slurry materials adopted for synchronous grouting mainly comprise fly ash, sand, bentonite and the like, the waste mud contains a large amount of bentonite, and the use amount of the bentonite and the fly ash can be reduced by adding the slurry in the concentration tank 300 to mix the mortar; meanwhile, the mortar is subjected to a mixing proportion test, the synchronous grouting mixing proportion is optimized through a field test, and the initial setting time, the consolidation strength and the slurry stability meet the requirements.

The filtrate tank 205 is connected with a pipe leading to a mortar mixing station and used as a water source for synchronous grouting.

The frequency of transporting the waste slurry outside can be reduced, the muddy water can be effectively recycled, and the cost is greatly saved.

(2) The method is used for improving the muck of the earth pressure shield machine.

The mud after the mud-water separation part can be used for improving the muck of the earth pressure shield machine; through on-site actual use, the torque of the cutter head can be effectively reduced, the abrasion of the cutter head and the cutter can be reduced, and the working efficiency of shield tunneling construction can be improved.

In step S4, the method further includes slurry quality control, which detects the specific gravity and viscosity of the slurry and adjusts the slurry ratio in real time.

In the recycling process of the mud water, the mud water performance management is mainly to control the mud quality; the mud quality control comprises four major factors: maximum particle size, mud specific gravity, mud viscosity and sand content.

During tunneling, slurry inlet pressure and excavation face pressure, slurry inlet and outlet density, viscosity, deviation flow and excavation square amount are monitored. After the slurry is treated, the slurry is in a normal state, and the tunneling starts to work; when abnormality occurs in monitoring, triggering bypass operation, detecting density and viscosity of inlet and outlet slurry, and adjusting slurry ratio; and after the adjustment is normal, continuing to supply for tunneling.

The utility model discloses, be arranged in high flood peak, large-traffic, the slurry shield muck that osmotic coefficient is big, geological conditions is complicated discharges smoothly, keeps excavation face muddy water storehouse to press stably, mud regeneration, carry out secondary separation regeneration with muck, the mud that mud-water separation subassembly sieves out innovatively.

The separated sand is screened and cleaned and then is used for the synchronous grouting raw material of the tunnel; pebbles are screened and cleaned and then are used for on-site construction; after the secondary adjustment of the waste slurry, the waste slurry is used for synchronously grouting raw materials and improving the earth pressure shield muck; effectively reduces the resource waste and reasonably saves the construction cost.

The utility model discloses, through mud-water separation and regeneration utilization technical research, in the fresh thick liquid preparation pond 401 modulation fresh thick liquid, carry adjustment pond 301, adjustment thick liquid is carried to the shield structure muddy water cabin through the thick liquid pump of advancing and advance the thick liquid pipeline; mud formed by mixing soil sand cut by the shield cutter head and muddy water in the muddy water cabin is sent to a muddy water treatment system on the ground for separation through a slurry discharge pump and a slurry discharge pipeline; in the separation equipment, the slurry is subjected to coarse screening, primary treatment and secondary treatment to separate large particles, the underflow of a concentration tank 300 is subjected to filter pressing treatment, and clear water is precipitated after residue and soil separation for recycling; and performing synchronous grouting and recycling on the filter-pressed residue soil and sand through a test mixture ratio, so as to ensure that the residue soil recycling ensures the economic benefit to the maximum extent.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (5)

1. A mud-water separation regeneration system for slurry shield constructs, its characterized in that includes:

the mud water treatment system: carrying out mud-water separation, recovery, slurry preparation and filter pressing;

the muddy water circulation component: the slurry treatment system is communicated with the shield slurry cabin to convey new slurry and old slurry, and the shield slurry cabin consists of a slurry feeding and discharging pump and a slurry feeding and discharging pipe;

the muddy water treatment system comprises:

the mud-water separation component: the method comprises the following steps of (1) carrying out sand-slurry separation on slurry discharged by a shield, and dewatering the discarded slag (100) so as to be suitable for direct transportation of a dump truck without slurry leakage;

preparing a slurry mixing component: recyclable sand, stone and liquid generated by the mud-water separation component and the filter pressing component are utilized, appropriate slurry is prepared by adopting slurry preparation and mixing equipment and is conveyed to the shield through the mud-water circulation component, and flow balance, material balance, circulation slurry adjustment and rapid compensation of shield circulation are realized;

a filter pressing component: and (4) treating waste slurry generated by the mud-water separation component, performing filter pressing on mud cakes, and recycling the waste liquid.

2. The mud-water separation and recycling system for the mud-water shield according to claim 1, wherein the mud-water separation component adopts pre-screening and secondary cyclone separation to realize good separation of sand and mud in shield circulating mud; the dewatering sieve is adopted for high-frequency vibration dewatering, so that the water content of the externally-discarded slag (100) is less than or equal to 25 percent, and the method is suitable for direct transportation of a dump truck without slurry leakage;

the mud-water separation subassembly includes: the roughing device, the primary separation device and the secondary separation device are arranged in sequence;

the roughing device comprises: a clay block-slurry separator (101) and a coarse screen (102) which are arranged in sequence;

the primary separation apparatus comprises: a primary cyclone (103) and a primary dewatering screen (104) which are arranged in sequence;

the secondary separation apparatus comprises: a secondary cyclone (106) and a secondary dewatering screen (107) which are arranged in sequence.

3. The mud-water separation and recycling system for the slurry shield as recited in claim 2, wherein the slurry preparation and mixing part comprises a slurry preparation system and a slurry mixing system;

the pulping system consists of a new pulp preparation tank (401), a new pulp storage tank (402) and a chemical agent storage tank (403);

the new pulp preparation tank (401) is provided with an automatic pulping assembly (404), and the new pulp preparation tank (401) is communicated to a new pulp storage tank (402); the chemical agent storage pool (403) is provided with a chemical agent preparation assembly and is communicated to the new slurry preparation pool (401) and the new slurry storage pool (402);

the pulp mixing system consists of a concentration tank (300), an adjusting tank (301), a clean water tank (302) and a filtrate tank (205);

the inlet end of the concentration tank (300) is communicated to the mud-water separation assembly, the outlet end of the concentration tank (300) is communicated to the adjusting tank (301), and the fresh slurry storage tank (402) is communicated to the adjusting tank (301);

the inlet end of the filtrate tank (205) is communicated to the filter pressing assembly, and the outlet end of the filtrate tank (205) is communicated to the clean water tank (302) and the adjusting tank (301);

the clean water tank (302) is communicated with the adjusting tank (301), the new slurry preparation tank (401), the new slurry storage tank (402) and the chemical agent storage tank (403).

4. The mud-water separation and recycling system for the slurry shield according to claim 3, wherein the filter pressing assembly adopts a filter pressing device to treat the redundant waste slurry and recycle the waste liquid;

the filter pressing assembly comprises: a filter press (201) and a stirring barrel (202);

the inlet end of the stirring barrel (202) is communicated to a concentration pool (300) of the slurry preparation and mixing system, a stirring device (203) is arranged in the stirring barrel (202), the outlet end of the stirring barrel (202) is communicated to a filter press (201) through a diaphragm pump (204), and the filter press (201) is connected to a filtrate pool (205).

5. The mud-water separation and recycling system for the slurry shield according to claim 1, wherein the mud-water treatment system is arranged on the ground, and further comprises:

and a comprehensive management part: and a PLC centralized control room is adopted for remote control, so that remote centralized control and real-time monitoring of the muddy water treatment system are realized.

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