CN112807816A - Shield constructs dregs sediment thick liquid screening and solidification stirring integrated system - Google Patents
Shield constructs dregs sediment thick liquid screening and solidification stirring integrated system Download PDFInfo
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- CN112807816A CN112807816A CN202011643400.6A CN202011643400A CN112807816A CN 112807816 A CN112807816 A CN 112807816A CN 202011643400 A CN202011643400 A CN 202011643400A CN 112807816 A CN112807816 A CN 112807816A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
- B01D33/0346—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
- B01D33/0353—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements self-supporting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
- B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
- B01F27/2322—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes with parallel axes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
Abstract
The invention discloses a shield muck slurry screening, curing and stirring integrated system which comprises a support frame, a screening and separating module, a collecting and stirring module and a curing agent adding and homogenizing module, wherein the support frame is provided with a support frame; the screening and separating module comprises a square hole screen, a transverse vibration motor, a longitudinal vibration motor and more than one spray pipe; the collecting and stirring module comprises a collecting box and a horizontal stirring device arranged in the collecting box, and the collecting box is positioned below the square hole sieve; the curing agent adding and homogenizing module comprises a slurry pump, a conveying pipe and an automatic curing agent metering and adding device. The invention realizes the continuous flow operation of shield muck coarse particle-slurry separation, homogenization and solidification stirring, and the uniform mixing of the curing agent and the slurry is completed in the conveying pipe by virtue of the turbulent flow effect formed by the partition bars inside the conveying pipe, without arranging a slurry homogenization tank and a solidification stirring tank, so that the equipment occupies small space, has high automation degree, and provides equipment support for the efficient and environment-friendly treatment of the shield muck.
Description
Technical Field
The invention relates to the field of shield construction equipment, in particular to a shield muck slurry screening, curing and stirring integrated system.
Background
The shield construction is widely applied to urban subway engineering construction in China due to the advantages of good safety, small ground influence, high construction efficiency and the like, in order to improve the stability of the outer surface of the shield, reduce the abrasion of a cutter and ensure the mud discharge, the shield muck is generally improved at the positions of a tunnel face, a soil bin and the like by adopting an improved material, and finally the obtained shield muck is mostly in a flow plastic shape and contains a large amount of mud, so that the transportation and backfilling difficulty is increased, the risk potential hazards such as road traffic safety, environmental pollution, yard landslide and the like exist, and the technical problem which needs to be solved urgently is solved.
In order to realize effective treatment of the muck from the technical level, the prior art is researched and developed by a plurality of treatment devices in cooperation with a treatment process. Patent CN211100741U discloses a shield constructs dregs zero release processing system, provides one set of shield and constructs multistage screening and belt cleaning device, and the mud that obtains adopts the filter-pressing mode precipitation solidification finally. Patent CN211160702U discloses a soil pressure shield constructs dregs screening equipment, and equipment sets gradually into primary screen cloth, fine screen cloth, smart screen cloth and centrifuge from top to bottom, and the equipment main function is the high-efficient screening that realizes the dregs and the dehydration of mud.
However, the prior art has a complex structure and a single function, and can not be continuously operated in a stream for screening and curing.
Disclosure of Invention
The invention aims to solve the technical problem of providing a shield muck slurry screening and curing stirring integrated system which can realize continuous flow operation of shield muck coarse particle-slurry separation, homogenization and curing stirring, has small equipment occupation space and high automation degree.
In order to solve the technical problems, the invention adopts the following technical scheme: a shield muck slurry screening, curing and stirring integrated system comprises a support frame, a screening and separating module, a collecting and stirring module and a curing agent adding and homogenizing module;
the screening and separating module comprises a square hole screen, a transverse vibration motor, a longitudinal vibration motor and more than one spray pipe; four corners of the square hole sieve are respectively connected to the support frame through springs, the transverse vibration motor and the longitudinal vibration motor are respectively fixed to the support frame, output shafts of the transverse vibration motor and the longitudinal vibration motor are respectively connected with one side of a wide edge and one side of a long edge of the square hole sieve, and more than one spray pipe is arranged on the support frame and located above the square hole sieve;
the collecting and stirring module comprises a collecting box and a horizontal stirring device arranged in the collecting box, and the collecting box is arranged on the supporting frame and is positioned below the square hole sieve;
the curing agent adding and homogenizing module comprises a slurry pump, a conveying pipe and a curing agent automatic metering and adding device, a slurry inlet of the slurry pump is communicated with the collecting box, a slurry outlet of the slurry pump is communicated with a slurry inlet of the conveying pipe, a curing agent adding port is arranged at a slurry inlet end of the conveying pipe and is communicated with the curing agent automatic metering and adding device, and a plurality of parting beads are installed in the conveying pipe.
Furthermore, the square hole sieve is designed to incline 10-20 degrees relative to the horizontal plane along the length direction, the higher end of the square hole sieve is a feeding end, and the lower end of the square hole sieve is a discharging end.
Furthermore, a cone-shaped receiving hopper is mounted at the bottom of the square hole sieve, and the bottom of the cone-shaped receiving hopper is positioned above the center of the collecting box.
Furthermore, the two spraying pipes are arranged in total, the two spraying pipes are arranged along the width direction of the square hole sieve, and a plurality of spray heads are arranged at the bottoms of the two spraying pipes at intervals.
Furthermore, the horizontal stirring devices are arranged, the bottom wall of the collecting box is composed of two arc-shaped bottom plates, the horizontal stirring devices are respectively positioned right above the two arc-shaped bottom plates, and the horizontal stirring devices rotate towards the inner side of the collecting box when rotating.
Furthermore, the two arc-shaped bottom plates are inclined relative to the horizontal plane, the slope of the two arc-shaped bottom plates is 5%, the lower ends of the two arc-shaped bottom plates are respectively connected with a mud outlet pipe, and the mud outlet pipes are communicated with a mud inlet of the mud pump.
Furthermore, the plurality of division bars are fixed on the inner wall of the conveying pipe in a vertically staggered mode at intervals along the length direction of the conveying pipe, the conveying pipe is in an inclined design with the gradient of 5% -10% relative to the horizontal plane, and the lower end of the conveying pipe is used as a mud inlet and communicated with a mud outlet of the mud pump.
Further, the device also comprises a temporary storage tank for the curing agent, wherein a feed inlet of the automatic curing agent metering and adding device is communicated with the temporary storage tank for the curing agent, and a discharge outlet of the automatic curing agent metering and adding device is communicated with the curing agent adding port.
Further, still include the interim storage tank of defoaming agent and defoaming agent automatic measurement and add the device, defoaming agent automatic measurement add the feed inlet of device with the interim storage tank of defoaming agent intercommunication, defoaming agent automatic measurement add the discharge gate of device with the shower intercommunication.
Furthermore, the horizontal stirring device comprises a stirring shaft rotatably arranged in the collecting box and a stirring blade fixed on the stirring shaft, and a stirring motor used for driving the stirring shaft to rotate is arranged on the outer wall of the collecting box corresponding to the position of the stirring shaft.
The invention also provides a preparation method of the synchronous mortar implemented based on the integrated system, wherein the synchronous mortar comprises the following raw materials in parts by weight: 40-60 parts of shield muck slurry, 0.02-0.07 part of defoaming agent, 0.5-1 part of tackifier, 0.03-0.05 part of foam inhibitor, 2-6 parts of fast-swelling bentonite, 5-15 parts of cement, 5-15 parts of fly ash, 10-20 parts of medium fine sand, 0.02-0.05 part of adsorption sacrificial agent, 0.2-0.5 part of early strength agent and 3-10 parts of water, wherein the preparation method comprises the following steps:
(1) stirring the residue soil discharged by the shield in a premixing pool uniformly to form residue soil to be screened, conveying the residue soil to be screened onto a square-hole sieve of an integrated system for screening, synchronously and uniformly spraying a defoaming agent solution in proportion during screening, wherein the sieve bottom is shield residue soil slurry containing a defoaming agent to be used;
(2) discharging the shield muck slurry obtained in the step (1) into a collection box of the integrated system, continuously stirring, and keeping the shield muck slurry in the box uniform and not layered;
(3) sending the shield muck slurry in the collection box to forced stirring equipment through a curing agent adding homogenization module, and simultaneously adding a foam inhibitor, a tackifier and fast-swelling bentonite according to a proportion to obtain a pretreated muck slurry mixed solution, wherein the concentrated standing time of the mixed solution is not less than 0.5 h;
(4) and (3) firstly weighing cement, fly ash, medium and fine sand, an adsorption sacrificial agent and an early strength agent according to a proportion by adopting forced stirring equipment, uniformly mixing and stirring for 15s, then adding the mixed liquid obtained in the step (3) and water, and stirring for 120s to obtain the synchronous mortar prepared by the shield muck slurry.
Further, the shield muck slurry is a screening substrate obtained by screening hard rock geological shield muck through a 2.36mm square-hole sieve, and the water content is not lower than 50%. When the water content is insufficient, water may be additionally added.
Further, the defoaming agent is a polyether defoaming agent, and the mass concentration of the solution is three-ten-thousandth to one-thousandth.
Further, the tackifier is sodium carboxymethyl starch and xanthan gum according to a mass ratio of 1: 1, the viscosity (25 ℃) of a 2% aqueous solution of sodium carboxymethyl starch is not less than 500mPa · s, and the viscosity (25 ℃) of a 1% aqueous solution of xanthan gum is not less than 600mPa · s.
Further, the foam inhibitor is an alcohol foam inhibitor, and the mass concentration of the solution is one thousandth to five thousandth.
Further, the fast-swelling bentonite is MgO modified sodium bentonite, the content of MgO in the MgO modified sodium bentonite is 0.3%, the reading of a 0.5h viscometer 600r/min of the MgO modified sodium bentonite is not lower than 30, and the preparation method comprises the following steps: adding sodium bentonite and MgO into the aqueous solution, stirring to form a suspension, adding urea solution into the suspension, stirring, standing, filtering, grinding, and calcining at 450 deg.C for 30 min.
Further, the cement is one of Portland cement, ordinary Portland cement and slag Portland cement, and the strength grade is not lower than 42.5; the fly ash is I or II grade fly ash; the medium and fine sand is one of river sand and machine-made sand.
Further, the absorption sacrificial agent is any one or a mixture of more than two of diphosphonic acid, triphosphonic acid, tetraphosphonic acid and pentaphosphonic acid which are mixed according to any proportion.
Further, the early strength agent is a mixture of any one or more than two of calcium formate, sodium carbonate and gypsum mixed according to any proportion.
The preparation method of the synchronous mortar mainly solves the technical problem that the foaming and the setting time of the foaming agent in the earth pressure balance shield muck have negative influence, assists reasonable technical means to improve the working performance stability and the water erosion resistance of the synchronous mortar, provides a scientific technical scheme for preparing the synchronous mortar by the earth pressure balance shield muck slurry, and has the main technical principle that:
(1) the hard rock geology is constructed by adopting an earth pressure balance shield method, a cutter head can rub with a tunnel face soil layer in the shield process to generate a large amount of fine particles with continuous gradation, and the content of the fine particles in shield muck slurry obtained by screening through a 2.36mm square hole sieve is 50-70%. Wherein, the particle size of about 20 percent of particles is lower than 100 meshes, the particle fineness is similar to that of the fly ash, and the fly ash can replace part of the fly ash as filling particles of the synchronous mortar; the particle size distribution of the residual coarse particle size particles is similar to that of the medium-fine sand, and the medium-fine sand can be replaced as a stacking framework of the synchronous mortar. The particle size of the shield muck slurry is controlled to be less than 2.36mm, so that the risk of pipe blockage in the synchronous mortar construction process is reduced.
(2) The polyether type defoaming agent adopted by the invention can effectively eliminate bubbles generated by an anionic foaming agent (the foaming component of the domestic shield foaming agent is mostly anionic surfactant), and the defoaming agent is uniformly sprayed in the shield muck screening process, so that the bubbles generated by muck disturbance can be effectively eliminated, and the bubbles generated in the previous process can be better eliminated; meanwhile, the addition of the foam inhibitor in the preparation process of the mixed liquid can effectively inhibit the generation of mechanical stirring bubbles. Through the staged use of the technical means of defoaming firstly and then inhibiting the foam, the content of the foam in the subsequent use process of the shield muck slurry is effectively reduced, and the technical problem that the mechanical stirring is easy to foam due to the high content of the shield muck foaming agent is better solved.
(3) The invention utilizes the basic principle that the adsorption sacrificial agent generates competitive adsorption on the surface of the cement particles, reduces the adsorption quantity of the surfactant on the surface of the cement particles and reduces the delayed coagulation effect of the foaming agent. Furthermore, a proper amount of early strength components are added, so that the setting time of the synchronous mortar can be more accurately controlled, the working time of the synchronous mortar meets the construction requirement, and the synchronous mortar has better water erosion resistance.
(4) The fast swelling type bentonite is selected because the actual conditions of a construction site are fully considered, the shield construction site is very narrow, a large number of swelling tanks are arranged without redundant space, the bentonite is required to have a fast swelling effect, and the synchronous mortar can be mixed and used immediately to the maximum extent.
(5) The method adopts a sodium carboxymethyl starch and xanthan gum composite tackifying system, and firstly, the air entraining amount is small in the swelling tackifying process of the sodium carboxymethyl starch and the xanthan gum, so that the compactness and the fullness of the synchronous mortar can be ensured; secondly, the sodium carboxymethyl starch has the effect of quickly swelling a stable system at the early stage, so that an extremely unstable shield muck slurry system is quickly, stably and uniformly homogenized, and the uniformity of the quality of the synchronous mortar and the stability of the working performance are ensured; furthermore, a tackifying system obtained after swelling of the xanthan gum has certain thixotropic property, so that the synchronous mortar injected into the peripheral gap of the duct piece has the characteristic of rapidly losing fluidity and inerting, and the water erosion resistance of the synchronous mortar before coagulation and hardening is obviously enhanced.
(6) Earlier mixing of the shield muck slurry and the tackifier in the synchronous mortar preparation step is to make a muck slurry system more uniform and ensure the preparation quality of the synchronous mortar; the mixed solution is kept still for 0.5h to realize the full expansion of the bentonite and exert the colloid effect of the bentonite.
The integrated system of the invention has the beneficial effects that:
(1) the invention provides a set of integrated system for matching with the processes of residue soil screening separation and slurry solidification, which realizes the continuous flow operation of shield residue soil coarse particle-slurry separation, homogenization and solidification stirring, after the separated high-concentration slurry is quickly concentrated and homogenized, the curing agent is added into the conveying pipeline through the automatic curing agent adding device, and the uniform mixing of the curing agent and the slurry is completed in the conveying pipeline under the turbulent flow effect formed by the partition bars in the pipeline.
(2) The invention provides equipment support for the muck screening separation and slurry curing process, is beneficial to promoting the popularization and application of the shield muck direct curing process and promoting the efficient resource utilization of the shield muck.
(3) The invention provides the setting form of homogenizing equipment in the curing agent and slurry pipeline, solves the problems of large occupied space, high equipment operation cost and the like of the traditional mixing and stirring equipment and mechanical dehydration equipment, effectively reduces the investment and treatment cost of muck treatment equipment, and is beneficial to realizing the economical and environment-friendly treatment of shield muck.
The preparation method of the synchronous mortar has the beneficial effects that:
(1) through the combined type defoaming, foam inhibition, competitive adsorption and other technical means, the foaming and slow coagulation influences of the foaming agent are solved, the shield muck slurry can be used as the main component of the synchronous mortar, the shield muck slurry with about 1/3 volume can be consumed by preparing the synchronous mortar in a construction site in the same standard section, the dehydration treatment and the outward transportation amount of muck are reduced, an effective recycling way is provided for the most difficult-to-treat slurry muck, and the environment protection benefit is remarkable.
(2) The shield muck slurry is directly used as the main component of the synchronous mortar, the technical scheme provided by the invention has the advantages of strong operability, simple input equipment and less required field, obviously reduces the treatment cost of the shield muck slurry compared with a mechanical dehydration treatment mode, and is economical, reasonable and strong in popularization.
(3) The recycling of the shield muck slurry reduces the use of medium and fine sand and avoids the exploitation and utilization of natural sandstone resources.
(4) The prepared synchronous mortar has the characteristics of moderate setting time, good water erosion resistance, stable working performance, reasonable economic cost and the like, and lays a good foundation for the engineering popularization and application.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic structural view of a square-hole sieve and a tapered hopper according to an embodiment of the present invention.
FIG. 3 is a sectional view of the collection tank in one embodiment of the invention.
FIG. 4 is a cross-sectional view of a delivery tube in an embodiment of the present invention.
The components in the drawings are labeled as follows:
1, supporting a frame;
2, a screening and separating module, a 21-square-hole screen, a 22-transverse vibration motor, a 23-longitudinal vibration motor, a 24-spray pipe, a 25-nozzle, a 26-spring, a 27-cone-shaped receiving hopper, a 28-defoaming agent temporary storage tank and a 29-defoaming agent automatic metering and adding device;
3, a collecting and stirring module, a 31 collecting box, a 32 stirring shaft, 33 stirring blades, 34 stirring motors, 311 arc-shaped bottom plates and 312 sludge discharging pipes;
4 curing agent adding and homogenizing module, 41 mud pump, 42 conveying pipe, 43 parting bead, 44 curing agent adding port, 45 curing agent temporary storage tank and 46 curing agent automatic metering and adding device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications such as up, down, left, right, front, and rear … … are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship, motion, and the like between the components in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, "a plurality" means two or more. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
See fig. 1-4.
The invention relates to a shield muck slurry screening, curing and stirring integrated system, which comprises a support frame 1, a screening and separating module 2, a collecting and stirring module 3 and a curing agent adding and homogenizing module 4;
the screening and separating module 2 comprises a square hole screen 21, a transverse vibration motor 22, a longitudinal vibration motor 23 and more than one spray pipe 24; four corners of the square hole sieve 21 are respectively connected to the support frame 1 through springs 26, the transverse vibration motor 22 and the longitudinal vibration motor 23 are respectively fixed to the support frame 1, output shafts of the transverse vibration motor 22 and the longitudinal vibration motor 23 are respectively connected to one side of a wide edge and one side of a long edge of the square hole sieve 21, and more than one spray pipe 24 is installed on the support frame 1 and located above the square hole sieve 21;
the collecting and stirring module 3 comprises a collecting box 31 and a horizontal stirring device arranged in the collecting box 31, wherein the collecting box 31 is arranged on the supporting frame 1 and is positioned below the square hole sieve 21;
the curing agent adding and homogenizing module 4 comprises a slurry pump 41, a conveying pipe 42 and an automatic curing agent metering and adding device 46, wherein a sludge inlet of the slurry pump 41 is communicated with the collecting box 31, a sludge outlet of the slurry pump 41 is communicated with a sludge inlet of the conveying pipe 42, a curing agent adding port 44 is arranged at a sludge inlet end of the conveying pipe 42, the curing agent adding port 44 is communicated with the automatic curing agent metering and adding device 46, and a plurality of partition bars 43 are installed in the conveying pipe 42.
When the device is used, the shield residual soil and slag slurry is poured into the square hole sieve, the transverse vibration motor and the longitudinal vibration motor respectively drive the square hole sieve to rock from the transverse direction and the longitudinal direction alternately, the square hole sieve is used for sieving the shield residual soil and slag slurry, separation of coarse particles and slurry is realized, meanwhile, an antifoaming agent solution is sprayed into the square hole sieve through the spray pipe to eliminate foam in the slurry, the sieved slurry directly falls into the collecting box below and is quickly homogenized under the stirring action of the horizontal stirring device, finally, the slurry is discharged into the conveying pipe through the slurry pump, the curing agent is added into the conveying pipe through the automatic curing agent metering and adding device, and the uniform mixing of the curing agent and the slurry is completed in the conveying pipe by means of the turbulent flow formed by the partition bars in the conveying pipe.
Of course, the curing agent adding homogenizing module can be used for adding not only the curing agent, but also other materials.
In one embodiment, the device further comprises a temporary storage tank 45 for curing agent, the feeding port of the automatic metering and adding device 46 for curing agent is communicated with the temporary storage tank 45 for curing agent, and the discharging port of the automatic metering and adding device 46 for curing agent is communicated with the adding port 44 for curing agent. By the design, the curing agent can be stored in the curing agent temporary storage tank, the using amount in a certain time can be met, and the practicability is better. In the concrete implementation, a curing agent adding port can be arranged at the position 0.5m away from the mud inlet end on the upper part of the conveying pipe, so that the flowing distance of the curing agent is increased as much as possible, and the mixing effect is improved.
In one embodiment, a plurality of the division bars 43 are fixed on the inner wall of the conveying pipe 42 along the length direction of the conveying pipe 42 in a staggered manner at intervals up and down. By the design, the flow disturbing directions of the curing agent and the slurry in the conveying pipe are changed in a staggered mode, and the homogenization effect is better.
In one embodiment, the conveying pipe 42 is inclined at a slope of 5% to 10% with respect to the horizontal plane, and a lower end of the conveying pipe 42 is used as a mud inlet and is communicated with a mud outlet of the mud pump 41. Design like this, curing agent and mud are carried in the conveyer pipe climbing, under self action of gravity, have the trend of backward movement, and curing agent and mud can be to more orientation dispersion, further increase the vortex effect.
Generally, the total length of the conveying pipe is 3m, the conveying pipe is made of a steel pipe, the inner diameter of the conveying pipe is 15cm, the conveying pipe is arranged in a linear mode, a first partition strip is arranged at a position 1m away from a mud inlet end, then four partition strips are arranged at intervals of 0.5m in an up-down staggered mode, the height of each partition strip is 2cm, and mud and a curing agent can be fully mixed. Of course, in practice, the above values may also be adjusted as needed.
In one embodiment, the square hole sieve 21 is designed to be inclined by 10-20 degrees relative to the horizontal plane along the length direction, and the higher end of the square hole sieve 21 is a feeding end and the lower end is a discharging end. Design like this, the material sieves along length direction, and the raw materials can progressively be laid in the sifter, and the screening effect is better.
In one embodiment, a tapered receiving hopper 27 is mounted at the bottom of the square-hole screen 21, and the bottom of the tapered receiving hopper 27 is located above the center of the collecting tank 31. The taper receiving hopper is used for intensively discharging the slurry into the collecting box, so that the scattering leakage is avoided, and the practicability is better.
In general, a square-hole sieve of 2.36mm is selected, the size of the square-hole sieve is 2.5m in length and 1.5m in width, and materials are sieved out along the length direction, so that the screening of the shield residual soil and slurry can be met. The distance between the upper edge plane of the collecting box and the lower edge of the cone-shaped collecting hopper is 20cm, and the sludge discharge requirement can be met. Of course, in practice, the above values may also be adjusted as needed.
In one embodiment, two spray pipes 24 are provided, the two spray pipes 24 are arranged along the width direction of the square-hole screen 21, and a plurality of spray heads 25 are installed at the bottoms of the two spray pipes 24 at intervals. By the design, the defoaming agent solution can be sprayed into the square-hole sieve more uniformly.
Preferably, one of the showers 24 is positioned 10cm from the feed end and the other of the showers 24 is positioned 50cm from the feed end. By the design, the defoaming agent can be sprayed into the shield muck slurry twice, so that the defoaming agent and the slurry are uniformly mixed.
In one embodiment, the system further comprises a temporary defoaming agent storage tank 28 and an automatic defoaming agent metering and adding device 29, wherein a feeding port of the automatic defoaming agent metering and adding device 29 is communicated with the temporary defoaming agent storage tank 28, and a discharging port of the automatic defoaming agent metering and adding device 29 is communicated with the spray pipe 24. Design like this, can deposit the curing agent in the curing agent temporary storage tank, send into the shower by defoaming agent automatic measurement interpolation device again, can satisfy the quantity of certain time, the practicality is better.
Generally, the vertical distance between the spray pipe 24 and the screen surface of the square-hole screen 21 is 15-30 cm, so that the use requirement can be met.
In an embodiment, two horizontal stirring devices are provided, the bottom wall of the collection box 31 is composed of two arc-shaped bottom plates 311, the two horizontal stirring devices are respectively located right above the two arc-shaped bottom plates 311, and the two horizontal stirring devices rotate towards the inner side of the collection box 31 when in operation. Design like this, two arc bottom plates form two depressed areas, and two stirring apparatus crouch when the stirring, not only can realize the mixture of two depressed areas interior mud, can also be with the continuous region of stirring into the other side of mud, increase the mixed effect.
In an embodiment, the horizontal stirring device comprises a stirring shaft 32 rotatably installed in the collection box 31 and a stirring blade 33 fixed on the stirring shaft 32, and a stirring motor 34 for driving the stirring shaft 32 to rotate is installed on the outer wall of the collection box 31 at a position corresponding to the stirring shaft 32. The design has simple structure, easy implementation and reliable stirring effect.
In general, the lower edge of the stirring blade is spaced from the bottom of the arc by 3 mm. Slurry can be brought as far as possible, and the stirring effect is improved.
In an embodiment, the two arc-shaped bottom plates 311 are both designed to be inclined with a slope of 5% relative to the horizontal plane, the lower ends of the two arc-shaped bottom plates 311 are respectively connected with a mud outlet pipe 312, and the mud outlet pipe 312 is communicated with the mud inlet of the mud pump 41. By the design, the mud can be guided to be discharged from the mud discharging pipe and enter the mud pump, the slope cannot be too high, otherwise the mud can be poured on one side of the collecting box, and the stirring effect is influenced.
In the concrete implementation, the slush pump can select piston slush pump for use, and defoaming agent automatic measurement adds the device and curing agent automatic measurement adds the device and can select the measuring pump for use, and the support frame design is cuboid frame construction.
The invention relates to special equipment design matched with a muck screening separation and slurry solidification process, aims at the practical situations of small field, large single-day soil output and the like of a shield construction field, takes continuous and automatic production operation as a basic principle of equipment design, and mainly solves the technical problems of equipment miniaturization, streamlined operation and the like. Provides a shield residual soil coarse particle-slurry separation, homogenization, solidification and stirring continuous flow production integrated device.
In order to facilitate understanding of the influence of each raw material on the material performance in the preparation method of the synchronous mortar, 6 examples and 5 comparative examples are provided below for effect comparison, and the formula of each example and each comparative example is shown in table 1, wherein the example experiment is carried out in a certain standard section of Guangzhou subway No. 7 line, the shield muck slurry is a sieve substrate obtained by sieving hard rock geological shield muck through a 2.36mm square-hole sieve, and the water content is 50%; the defoaming agent is a polyether defoaming agent, and the mass concentration of the solution is three ten-thousandth; the foam inhibitor is an alcohol foam inhibitor, and the mass concentration of the solution is one thousandth; the tackifier is sodium carboxymethyl starch and xanthan gum according to the mass ratio of 1: 1, a 2% aqueous solution viscosity (25 ℃) of sodium carboxymethyl starch of 600mPa · s, a 1% aqueous solution viscosity (25 ℃) of xanthan gum of 650mPa · s; the fast-swelling bentonite is MgO modified sodium bentonite, the content of MgO in the MgO modified sodium bentonite is 0.3%, the reading of 0.5h viscometer 600r/min of the MgO modified sodium bentonite is not lower than 30, and the preparation method comprises the following steps: adding sodium bentonite and MgO into the aqueous solution, stirring to form a suspension, adding a urea solution into the suspension, stirring, standing, filtering, grinding, and calcining at 450 ℃ for 30 min; the cement is ordinary portland cement, and the strength grade is 42.5; the fly ash is grade II; the medium fine sand is river sand; the absorption sacrificial agent is triphosphonic acid; the early strength agent is calcium formate;
the preparation method is the same (in the comparative example, if the raw materials are not added, the steps are still operated), and the specific steps are as follows:
(1) uniformly stirring the residue soil discharged by the shield in a premixing pool by using an excavator to form residue soil to be screened, then conveying the residue soil to be screened to a square hole sieve (2.36mm) of the integrated system by adopting a spiral conveying or excavator overturning mode to carry out screening, synchronously and uniformly spraying an antifoaming agent solution with the mass concentration of three ten-thousandth to one thousandth on the surface of the residue soil according to a proportion during screening, wherein the screened substrate is shield residue soil slurry to be used;
(2) discharging the shield muck slurry obtained in the step (1) into a collection box of the integrated system, continuously stirring, and keeping the shield muck slurry in the box uniform and not layered;
(3) sending the shield muck slurry in the collection box to forced stirring equipment through a curing agent adding homogenization module, and simultaneously adding a foam inhibitor, a tackifier and fast-swelling bentonite according to a proportion to obtain a pretreated muck slurry mixed solution, wherein the mixed solution is intensively kept stand for 0.5 h;
(4) and (3) firstly weighing cement, fly ash, medium and fine sand, an adsorption sacrificial agent and an early strength agent according to a proportion by adopting forced stirring equipment, uniformly mixing and stirring for 15s, then adding the mixed liquid obtained in the step (3) and water, and stirring for 120s to obtain the synchronous mortar prepared by the shield muck slurry.
TABLE 1 compositions of examples and comparative examples (unit: parts by weight)
The results of the performance tests of the synchronous mortars prepared from the earth pressure balance shield muck slurries of examples 1 to 6 and comparative examples 1 to 5 are shown in table 2:
TABLE 2 results of performance test of examples and comparative examples
Table 2 remarks illustrate: 1. the applicable consistency range of the shield synchronous mortar is not more than 140 mm; 2. the suitable initial setting time of the shield synchronous mortar is 6-12 h; 3. the water erosion resistance of the synchronous mortar is generally characterized by adopting 30min filtration loss, preferably not more than 15 mL; 4. the calculus rate of the shield synchronous mortar is preferably not lower than 95 percent; 5. the compressive strength of the shield synchronous mortar after hardening is preferably not lower than 2.5 MPa.
It can be seen from the above that, in the embodiments 1 to 6, the synchronous mortar obtained by the present invention has various performances all meeting the basic use requirements of the synchronous mortar, and some performances of the synchronous mortar in each proportion do not meet the basic use requirements, and the synchronous mortar provided by the present technical scheme has been successfully applied to shield construction projects such as Guangzhou subway No. 7 line and Guiyang subway No. 3 line.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (10)
1. The utility model provides a shield constructs dregs sediment thick liquid screening and solidification stirring integrated system which characterized in that: comprises a support frame (1), a screening and separating module (2), a collecting and stirring module (3) and a curing agent adding and homogenizing module (4);
the screening and separating module (2) comprises a square hole screen (21), a transverse vibration motor (22), a longitudinal vibration motor (23) and more than one spray pipe (24); four corners of the square hole sieve (21) are respectively connected to the support frame (1) through springs (26), the transverse vibration motor (22) and the longitudinal vibration motor (23) are respectively fixed to the support frame (1), output shafts of the transverse vibration motor (22) and the longitudinal vibration motor (23) are respectively connected with one side of the wide edge and one side of the long edge of the square hole sieve (21), and more than one spray pipe (24) is installed on the support frame (1) and located above the square hole sieve (21);
the collecting and stirring module (3) comprises a collecting box (31) and a horizontal stirring device arranged in the collecting box (31), and the collecting box (31) is arranged on the supporting frame (1) and is positioned below the square hole sieve (21);
the curing agent adding and homogenizing module (4) comprises a slurry pump (41), a conveying pipe (42) and a curing agent automatic metering and adding device (46), a sludge inlet of the slurry pump (41) is communicated with the collecting box (31), a sludge outlet of the slurry pump (41) is communicated with a sludge inlet of the conveying pipe (42), a curing agent adding port (44) is arranged at a sludge inlet end of the conveying pipe (42), the curing agent adding port (44) is communicated with the curing agent automatic metering and adding device (46), and a plurality of partition bars (43) are installed in the conveying pipe (42).
2. The shield muck slurry screening, curing and stirring integrated system of claim 1, wherein: the square-hole sieve (21) is designed to incline 10-20 degrees relative to a horizontal plane along the length direction, the higher end of the square-hole sieve (21) is a feeding end, and the lower end of the square-hole sieve is a discharging end.
3. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: the square hole sieve is characterized in that two spraying pipes (24) are arranged, the two spraying pipes (24) are arranged along the width direction of the square hole sieve (21), and a plurality of spray heads (25) are arranged at the bottoms of the two spraying pipes (24) at intervals.
4. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: the horizontal stirring device is characterized in that the horizontal stirring devices are arranged, the bottom wall of the collection box (31) is composed of two arc-shaped bottom plates (311), the two horizontal stirring devices are respectively positioned right above the two arc-shaped bottom plates (311), and the two horizontal stirring devices rotate towards the inner side of the collection box (31) when in operation.
5. The shield muck slurry screening, curing and stirring integrated system of claim 4, wherein: the two arc-shaped bottom plates (311) are inclined relative to the horizontal plane, the gradient of the two arc-shaped bottom plates is 5%, the lower ends of the two arc-shaped bottom plates (311) are respectively connected with a mud outlet pipe (312), and the mud outlet pipes (312) are communicated with a mud inlet of the mud pump (41).
6. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: the plurality of division bars (43) are fixed on the inner wall of the conveying pipe (42) in a vertically staggered mode at intervals along the length direction of the conveying pipe (42), the conveying pipe (42) is in an inclined design with the gradient of 5% -10% relative to the horizontal plane, and the lower end of the conveying pipe (42) serves as a mud inlet and is communicated with a mud outlet of the mud pump (41).
7. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: the curing agent temporary storage tank (45) is further included, a feeding hole of the curing agent automatic metering and adding device (46) is communicated with the curing agent temporary storage tank (45), and a discharging hole of the curing agent automatic metering and adding device (46) is communicated with the curing agent adding hole (44).
8. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: still include defoaming agent storage tank (28) temporarily and defoaming agent automatic measurement and add device (29), the feed inlet of defoaming agent automatic measurement and add device (29) with defoaming agent storage tank (28) are temporarily linked together, the discharge gate of defoaming agent automatic measurement and add device (29) with shower (24) intercommunication.
9. The shield muck slurry screening, curing and stirring integrated system of claim 1 or 2, wherein: the horizontal stirring device comprises a stirring shaft (32) rotatably installed in the collection box (31) and a stirring blade (33) fixed on the stirring shaft (32), and a stirring motor (34) used for driving the stirring shaft (32) to rotate is installed on the outer wall of the collection box (31) at a position corresponding to the stirring shaft (32).
10. A method for the preparation of a synchronous mortar carried out on the basis of the integrated system according to any one of claims 1 to 9, characterized in that: the synchronous mortar comprises the following raw materials in parts by weight: 40-60 parts of shield muck slurry, 0.02-0.07 part of defoaming agent, 0.5-1 part of tackifier, 0.03-0.05 part of foam inhibitor, 2-6 parts of fast-swelling bentonite, 5-15 parts of cement, 5-15 parts of fly ash, 10-20 parts of medium fine sand, 0.02-0.05 part of adsorption sacrificial agent, 0.2-0.5 part of early strength agent and 3-10 parts of water, wherein the preparation method comprises the following steps:
(1) stirring the residue soil discharged by the shield in a premixing pool uniformly to form residue soil to be screened, conveying the residue soil to be screened onto a square-hole sieve of an integrated system for screening, synchronously and uniformly spraying a defoaming agent solution in proportion during screening, wherein the sieve bottom is shield residue soil slurry containing a defoaming agent to be used;
(2) discharging the shield muck slurry obtained in the step (1) into a collection box of the integrated system, continuously stirring, and keeping the shield muck slurry in the box uniform and not layered;
(3) sending the shield muck slurry in the collection box to forced stirring equipment through a curing agent adding homogenization module, and simultaneously adding a foam inhibitor, a tackifier and fast-swelling bentonite according to a proportion to obtain a pretreated muck slurry mixed solution, wherein the concentrated standing time of the mixed solution is not less than 0.5 h;
(4) and (3) firstly weighing cement, fly ash, medium and fine sand, an adsorption sacrificial agent and an early strength agent according to a proportion by adopting forced stirring equipment, uniformly mixing and stirring for 15s, then adding the mixed liquid obtained in the step (3) and water, and stirring for 120s to obtain the synchronous mortar prepared by the shield muck slurry.
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| CN202011643400.6A CN112807816A (en) | 2020-12-30 | 2020-12-30 | Shield constructs dregs sediment thick liquid screening and solidification stirring integrated system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133166A (en) * | 2021-10-13 | 2022-03-04 | 上海志昌建设工程有限公司 | Large-scale resource utilization method for engineering muck |
| CN115557774A (en) * | 2022-12-05 | 2023-01-03 | 中国市政工程华北设计研究总院有限公司 | Road subgrade material for solidifying shield muck with high water content and preparation method thereof |
| CN115849792A (en) * | 2022-11-28 | 2023-03-28 | 盾构及掘进技术国家重点实验室 | Preparation method of sprayed concrete by using rock ballast and matched rock ballast recovery equipment |
| CN117552835A (en) * | 2024-01-12 | 2024-02-13 | 河南永华能源有限公司 | Colliery geological engineering prevention and cure water management and control treatment facility |
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2020
- 2020-12-30 CN CN202011643400.6A patent/CN112807816A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133166A (en) * | 2021-10-13 | 2022-03-04 | 上海志昌建设工程有限公司 | Large-scale resource utilization method for engineering muck |
| CN115849792A (en) * | 2022-11-28 | 2023-03-28 | 盾构及掘进技术国家重点实验室 | Preparation method of sprayed concrete by using rock ballast and matched rock ballast recovery equipment |
| CN115849792B (en) * | 2022-11-28 | 2023-12-22 | 盾构及掘进技术国家重点实验室 | Method for preparing sprayed concrete by using rock slag and matched rock slag recovery equipment |
| CN115557774A (en) * | 2022-12-05 | 2023-01-03 | 中国市政工程华北设计研究总院有限公司 | Road subgrade material for solidifying shield muck with high water content and preparation method thereof |
| CN117552835A (en) * | 2024-01-12 | 2024-02-13 | 河南永华能源有限公司 | Colliery geological engineering prevention and cure water management and control treatment facility |
| CN117552835B (en) * | 2024-01-12 | 2024-03-22 | 河南永华能源有限公司 | Colliery geological engineering prevention and cure water management and control treatment facility |
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