CN114134908B - Deep foundation pit building waste slurry curing backfill construction method - Google Patents
Deep foundation pit building waste slurry curing backfill construction method Download PDFInfo
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- CN114134908B CN114134908B CN202111397468.5A CN202111397468A CN114134908B CN 114134908 B CN114134908 B CN 114134908B CN 202111397468 A CN202111397468 A CN 202111397468A CN 114134908 B CN114134908 B CN 114134908B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The application discloses deep basal pit building abandonment mud solidification backfill method, including following step: s1, conveying the waste slurry to a backfilling construction site; s2, pretreating the waste slurry to obtain slurry and water with the density ratio of 1.4-1.6; s3, respectively conveying the pretreated slurry and the curing agent to a mechanical stirrer to obtain a mixture, and fully stirring and mixing the mixture to obtain a reinforcing material; the curing agent comprises a mineral-based cementing material, and the mineral-based cementing material comprises an inorganic cementing material, cement and iron ore micro powder.
Description
Technical Field
The application relates to the technical field of buildings, in particular to a deep foundation pit building waste slurry solidification backfill construction method.
Background
In the engineering construction process, more and more underground works use construction processes such as cast-in-situ bored piles, underground continuous walls, shields and the like, and the construction processes can generate a large amount of waste slurry and pollute the soil quality and the water quality of the environment. The traditional treatment method is to pull the garbage to a centralized treatment site by using a tank truck and then naturally air-dry the garbage. With the increasing requirement on environmental protection, the traditional treatment method is gradually eliminated, the new treatment method is to use a slurry treatment machine to carry out dehydration treatment on slurry, the slurry is changed into solid slurry after dehydration and then is hauled, but the treatment process is complex and the cost is higher.
Along with the increasingly tense urban construction land, underground engineering gradually develops towards the deepening and the generous direction, the requirement on construction time is shorter and shorter, and the available overground and underground space is smaller and smaller in the construction process, so that the backfilled soil is not compact, and the construction quality of the waterproof coiled material outside the basement is further influenced. In recent years, water leakage is caused endlessly due to water-proof failure of underground engineering, which becomes a common quality disease, and the backfilled soil is not dense, so that the parts of buildings such as water, pipelines, residential roads and the like are sunk and damaged, accidents of losing using functions occur, and the existence of the accidents also brings harm to the seismic performance of high-rise buildings. The process of tamping and backfilling plain soil or lime soil is difficult to meet the actual engineering requirements, and only plain concrete or foam concrete is needed to be backfilled for ensuring the backfilling quality, so that the backfilling cost is high, and the concrete strength is high, thereby solving the problem of later maintenance.
Disclosure of Invention
An object of the present application is to provide a new technical solution of a deep foundation pit construction waste slurry solidification backfill method, which can solve at least one problem in the background art.
According to a first aspect of the application, a deep foundation pit building waste slurry curing backfill method is provided, which comprises the following steps: s1, conveying the waste slurry to a backfilling construction site; s2, pretreating the waste slurry to obtain slurry and water with the density ratio of 1.4-1.6; s3, respectively conveying the pretreated slurry and the curing agent to a mechanical stirrer to obtain a mixture, and fully stirring and mixing the mixture to obtain a reinforcing material; the curing agent comprises a mineral-based cementing material, and the mineral-based cementing material comprises an inorganic cementing material, cement and iron ore micro powder.
According to an embodiment of the application, step S3 comprises: s31, dividing the curing agent into a plurality of parts from the whole; s31, coating a film layer on the outer surface of each curing agent, wherein the raw materials of the film layer comprise a film forming agent and a hydrophobic material, and the hydrophobic material comprises titanium dioxide; s32, arranging an ultraviolet light emitter in the mechanical stirrer, and converting the titanium dioxide into hydrophilic through the ultraviolet light emitter; and S33, reacting the curing agent irradiated by the ultraviolet light with the slurry.
According to an embodiment of the present application, if the solid particles contained in the waste slurry in step S2 are sand, the particle size of the sand is 1 mm to 0.05 mm, and the content of the sand is greater than 50%, the step of pretreating the waste slurry includes: separating out part of water in the waste slurry by using a centrifugal cyclone to obtain separated water and dehydrated waste slurry which are separately placed; and adding a part of the dehydrated water back to the dehydrated waste slurry, and blending until the density ratio of the slurry to the water is 1.4-1.6.
According to an embodiment of the present application, if the waste slurry in step S2 contains more than a predetermined amount of cohesive soil, the step of pretreating the waste slurry includes: standing the waste slurry in a temporary storage tank body; removing upper floating water, testing concentration, if the density ratio of the slurry to the water is less than 1.4, adding a flocculating agent, standing, removing water, and testing specific gravity until the density ratio exceeds 1.4; if the density ratio of the slurry to the water exceeds 1.6, a part of water in the waste slurry is separated by using a centrifugal cyclone to obtain separated water and dewatered waste slurry which are placed separately, and the separated water is added until the density ratio of the slurry to the water is 1.4-1.6.
According to an embodiment of the application, the mechanical agitator comprises: a body having an accommodating cavity therein; the stirring blade is arranged in the accommodating cavity; the driving piece, the driving piece with stirring vane is connected, the driving piece is used for the drive stirring vane is rotatory.
According to the embodiment of this application, stirring vane's shape is the blade form, along the central point on stirring vane's the length direction puts the orientation the direction at stirring vane's both ends, stirring vane's width reduces gradually, stirring vane's edge with contained angle between stirring vane's length direction's the axis is the acute angle.
According to the embodiment of this application, the quantity of stirring vane is a plurality of, and a plurality of stirring vane divide into spaced apart first stirring vane and the second stirring vane who distributes, hold the chamber and be divided into: the first-stage stirring tank is internally provided with the first stirring blade; and the second-stage stirring tank is internally provided with second stirring blades, and the rotating speed of the second stirring blades is greater than that of the first stirring blades.
According to an embodiment of the present application, the film layer has an ester structure, a heating module is disposed in the mechanical stirrer, and step S3 further includes: and S34, heating and adjusting the pH value of the mixture in the process of fully stirring and mixing the mixture to enable the mixing condition to be a weak acid condition so as to enable the film layer to be hydrolyzed and shed.
According to an embodiment of the present application, the number of the stirring blades is plural, the plural stirring blades include a first blade portion and a second blade portion, ends of the first blade portion and the second blade portion are connected to form a connecting portion, the first blade portion and the second blade portion are symmetrical with respect to the connecting portion, the mechanical stirrer further includes: the movable plate is movably arranged in the accommodating cavity and is switched between a first position and a second position; wherein, under the condition that the movable plate is located at the first position, the movable plate divides the accommodation cavity into a first groove and a second groove, a through hole is formed on the movable plate, the connecting portion penetrates through the through hole, the radial dimension of the through hole is a first dimension, the first dimension is smaller than the maximum width of the first blade portion and the second blade portion, the first blade portion is located in the first groove, and the second blade portion is located in the second groove; the radial dimension of the through-hole is a second dimension that is greater than the first dimension with the movable plate in the second position.
According to the embodiment of the application, a first channel and a second channel are defined in the stirring blade, wherein a liquid outlet hole is formed in the surface of the stirring blade, and the first channel is communicated with the liquid outlet hole so as to input an acidic solution into the accommodating cavity; the heating module is a heating wire, and the heating wire is located in the second passage and extends along the axial direction of the second passage.
According to one embodiment of the disclosure, the obtained deep foundation pit building waste slurry solidified backfill has the advantages of high construction speed, suitability for pumping, controllable quality, low cost, high finished product strength, seepage prevention and the like, and provides a material for treating waste slurry and solving the construction problem according to the construction method of the application.
Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flow chart of a deep foundation pit building waste slurry curing backfill method according to an embodiment of the application;
FIG. 2 is a schematic structural view of a mechanical agitator according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a mechanical agitator according to yet another embodiment of the present application.
Reference numerals
A mechanical stirrer 100;
a body 10; a housing chamber 11; a primary stirring tank 12; a secondary stirring tank 13; a first groove 14; a second groove 15;
a stirring blade 20; the first agitating blade 21; the second agitating blade 22; a first leaf portion 23; a second leaf portion 24;
a drive member 30;
a movable plate 40; a through hole 41;
a connecting column 50.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
The deep foundation pit building waste slurry curing backfill method according to the embodiment of the application is described below with reference to the accompanying drawings.
As shown in fig. 1, the waste slurry curing backfill method for the deep foundation pit building according to the embodiment of the application comprises the following steps:
s1, conveying the waste slurry to a backfilling construction site, for example, conveying the waste slurry to the backfilling construction site through a tank car.
S2, pretreating the waste slurry to obtain slurry and water with the density ratio of 1.4-1.6. That is, after the waste slurry is delivered to the backfill site, the waste slurry is first pre-treated with a slurry concentration treater. Different projects have different requirements on strength and also on the concentration of the slurry. In actual construction, the specific gravity (also called relative density, the ratio of the density of the slurry to the density of water) is used for controlling the specific gravity of the slurry to be between 1.4 and 1.6. For example: the specific gravity is 1.4, 1.42, 1.45, 1.5, 1.53 or 1.6.
And S3, respectively conveying the pretreated slurry and the curing agent to a mechanical stirrer 100 to obtain a mixture, and fully stirring and mixing the mixture to obtain the reinforcing material, namely the filler.
The curing agent comprises a mineral-based cementing material, and the mineral-based cementing material comprises an inorganic cementing material, cement and iron ore micro powder. That is, the main component of the curing agent is a mineral-based cementing material, and the main component of the mineral-based cementing material is an inorganic cementing material, cement and iron ore micropowder. The inorganic binder may include alumina, among others. Mineral-based cementitious materials belong to the group of inorganic hydraulic cementitious materials. When mineral-based cementitious materials are used for setting slurries, the minerals on the surface of the material particles undergo strong hydrolysis and hydration reactions with the moisture in the soil, while calcium hydroxide dissociates from the solution and forms other hydrates.
The hardened strength of the waste slurry solidified backfill soil after 28 days is 0.3-5 MPa, and the formula of the curing agent can be adjusted according to the slurry property and the design requirement during mixing, so that the strength and the fluidity of the waste slurry solidified backfill soil can be ensured. For example, if the early strength is required to be high and the strength needs to reach more than 0.3 MPa for three days, the weight ratio of the alumina and the cement in the curing agent is increased to 30-40 percent. If the later strength is required to be high, for example, the strength of 28 days is more than 1.5 MPa, the weight ratio of the iron ore micro powder in the curing agent is increased to 50-60 percent.
In the embodiment, the waste slurry is pretreated, and the pretreated slurry is reacted with the curing agent, so that the pollution problem of the slurry is solved, waste is changed into valuable, the backfill compactness of the basement is solved, a permanent waterproof curtain is added for the basement, and the environment friendliness, new materials and a new process are considered. The construction method can be used for backfilling and pouring of various foundation grooves, foundation pits and holes, and can also be widely used in the field of reinforcement treatment of road foundations, building foundations and the like.
Therefore, the deep foundation pit building waste slurry curing backfill obtained according to the construction method has the advantages of high construction speed, suitability for pumping, controllable quality, low cost, high finished product strength, seepage prevention and the like, and provides a material for treating waste slurry and solving the construction problem.
According to an embodiment of the application, step S3 comprises:
s31, dividing the curing agent into a plurality of parts from the whole, wherein the curing agent can be divided into a plurality of parts in advance, or a part of the curing agent can be intermittently and gradually added into the mechanical stirrer 100, so that the whole part and the part are distinguished. By dividing the curing agent into a plurality of parts, a film layer is favorably formed on the outer surface of the curing agent. The size of each curing agent can be determined and designed according to the ratio range of the density of the slurry to the density of water. For example, the size of each curing agent is small when the ratio of the density of the slurry to the density of water is 1.4, and is large when the ratio of the density of the slurry to the density of water is 1.6. Wherein, the thinner curing agent can be combined into the curing agent meeting the size requirement by prepressing or adding an adhesive and the like. In the present embodiment, by using the curing agent of a limited size, it is possible to ensure a sufficient contact area between the curing agent and the slurry. If the specific gravity of the mud density and the water density is 1.4, the size of each curing agent is larger; or when the specific gravity of the slurry density and the water density is 1.6, the small size of each curing agent can cause the surface of part of the curing agent or the surface of the curing agent to be in an idle state in unit time, thereby wasting resources and reducing the mixing efficiency and the efficiency of materials required by later-stage production.
S31, coating a film layer on the outer surface of each curing agent, wherein the raw materials of the film layer comprise a film forming agent and a hydrophobic material, and the hydrophobic material comprises titanium dioxide. It should be noted that, during production, the film forming agent and the hydrophobic material can be prepared into a coating material, and then the coating material is coated on the outer surface of the curing agent. In addition, the raw materials for preparing the film layer can also comprise a pore-foaming agent, and the pore-foaming agent is favorable for realizing the slow release of the curing agent, thereby realizing the regulation and control of the reaction progress between the curing agent and the cement.
S32, an ultraviolet emitter is provided in the mechanical agitator 100, and the titanium dioxide is converted into hydrophilic by the ultraviolet emitter. The ultraviolet light emitter can emit ultraviolet light to irradiate the film layer, and the titanium dioxide shows hydrophilicity after being irradiated by the ultraviolet light and can show hydrophobicity again after being placed in a dark environment for a period of time.
And S33, reacting the curing agent irradiated by the ultraviolet light with the slurry, namely, irradiating the film layer by the ultraviolet light emitted by the ultraviolet light emitter before the slurry and the curing agent are reacted, so that the curing agent is combined with the soil, and the reaction between the curing agent and the slurry is facilitated. In this embodiment, the reaction progress of the curing agent and the slurry can be controlled by using the following conditions: (1) The surface of the curing agent is coated with a film layer and is placed for storage. Before the curing agent and the slurry are required to be mixed, the curing agent is irradiated by ultraviolet light to enable the curing agent to become a hydrophilic material; then, mixing a curing agent with the slurry, and slowly reacting materials in a film layer in the curing agent with the slurry and water; (2) The surface of the curing agent is coated with a film layer, and the curing agent is placed and stored. When the curing agent and the slurry are required to react, the hydrophobic curing agent and the slurry are mixed first, and in this case, even if the curing agent and the slurry react with each other, the degree of the reaction is not large. Then ultraviolet light is adopted for irradiation, and then stirring and mixing are continued, so that the materials in the film layer in the curing agent slowly react with the slurry and the water, and the actual reaction time is controlled.
In the present embodiment, by providing the ultraviolet emitter in the mechanical agitator 100, it is possible to switch the film layer between hydrophilic and hydrophobic properties by utilizing the properties of titanium dioxide.
According to an embodiment of the present application, if the solid particles contained in the waste slurry in step S2 are sand, the sand has a particle size of 1 mm to 0.05 mm, and the content of the sand is greater than 50% (the weight of the sand is greater than 50% of the weight of the slurry), the step of pretreating the waste slurry comprises:
and S21, separating out part of water in the waste slurry by using a centrifugal cyclone to obtain separated water and dehydrated waste slurry which are separately placed. That is, if the solid particles contained in the slurry are sandy soil (the particle size is 1 mm to 0.05 mm, and the content of sandy soil is more than 50%), the centrifugal cyclone is used to separate a part of the water, and the specific gravity of the residual slurry is increased greatly, and generally exceeds 1.6.
S22, adding a part of the dehydrated water back to the dehydrated waste slurry, and blending until the density ratio of the slurry to the water is 1.4-1.6. That is, in order to prepare a slurry having a specific gravity of 1.4 to 1.6, it is necessary to add the separated water back to the dewatered waste slurry according to the calculation result to prepare a slurry having a desired specific gravity.
In some embodiments of the present application, if the waste slurry in step S2 includes more than a predetermined amount of cohesive soil, the step of pretreating the waste slurry includes:
s21', placing the waste slurry in a temporary storage tank body for standing. That is, if the amount of the cohesive soil is large, the waste slurry is placed in a temporary storage tank and left to stand.
S22', removing upper floating water, testing concentration, adding a flocculating agent if the density ratio of the slurry to the water is less than 1.4, standing, removing water, and testing specific gravity until the density ratio exceeds 1.4.
If the density ratio of the mud to the water exceeds 1.6, separating out part of water in the waste mud by using a centrifugal cyclone to obtain separated water and dehydrated waste mud, and adding the separated water until the density ratio of the mud to the water is 1.4-1.6. That is, after standing for a certain period of time, the upper floating water was removed, and then the concentration was measured. If the specific gravity is less than 1.4, adding a flocculating agent, standing for dewatering, and testing the specific gravity until the specific gravity exceeds 1.4. If the specific gravity exceeds 1.6, adding a certain amount of dehydrated water according to the calculation result, and preparing the slurry with the required specific gravity.
That is, in step S2, the soil particles contained in the slurry are treated separately according to their properties, and when the solid particles contained in the slurry are sandy soil or when the slurry contains a large amount of cohesive soil, the specific gravities of the slurry and water are adjusted in different ways.
According to one embodiment of the present application, the mechanical agitator 100 includes a body 10, an agitating blade 20, and a driving member 30. Wherein, the body 10 has a containing cavity 11 therein, and the stirring blade 20 is arranged in the containing cavity 11. The driving member 30 is connected to the stirring blade 20, and the driving member 30 is used for driving the stirring blade 20 to rotate.
That is to say, after the slurry with the required specific gravity is prepared, the mechanical stirrer 100 of the present application can be used to fully mix the curing agent and the slurry with a certain concentration, so as to form a pumpable, strong-fluidity, fast-curing, self-compacting reinforcing material.
In some embodiments of the present application, the stirring vane 20 has a blade shape, the width of the stirring vane 20 gradually decreases along the direction from the center of the stirring vane 20 in the length direction to the two ends of the stirring vane 20, and the included angle between the edge of the stirring vane 20 and the axis of the stirring vane 20 in the length direction is an acute angle. For example, the agitating blade 20 extends in the horizontal direction, and the radial dimensions of the left and right ends of the agitating blade 20 are smaller than the radial dimension of the middle portion. That is, the stirring vanes 20 have a narrow vane shape. In the present embodiment, by using the stirring blade 20 having a narrow blade shape, the contact area between the blade and the slurry can be increased, and the slurry and/or the curing agent can be stirred in the long-sized housing chamber 11. When the specific gravity of the slurry and water is small, the radial dimension of the central portion of the stirring vanes 20 is small, enabling an increase in the volume of treatment per unit time. When the specific gravity of the slurry and the water is large, the radial dimension of the middle part of the stirring blade 20 is large, and the stirring blade can be intensively processed at a local position, so that excessive energy consumption is avoided.
Further, the mechanical agitator 100 further comprises a connecting column 50, two ends of the stirring blade 20 are respectively connected with the connecting column 50, wherein at least one end of the stirring blade 20 is movably connected with the connecting column 50. For example, the connecting column 50 extends along the horizontal direction, the left end of the mixing blade 20 is fixedly connected with the connecting column 50, and the right end of the mixing blade 20 is movably connected with the connecting column 50. The right end of the stirring blade 20 can be driven to move leftwards, the distance between the two ends of the stirring blade 20 is shortened, and the radial size of the middle part of the stirring blade 20 is enlarged. The right end of the stirring blade 20 can also be driven to move rightwards, the distance between the two ends of the stirring blade 20 is increased, and the radial size of the middle part of the stirring blade 20 is reduced. In this embodiment, the specific shape and angle of the stirring blade 20 can be adjusted, and can be selected according to the actual conditions of slurry, water and curing agent, and the application range is wide. In addition, the position of the end of the stirring blade 20 can be electrically controlled during the stirring process, and real-time adjustment is realized.
When the two ends of the stirring blade 20 are movably connected with the connecting column 50, the shapes of the two stirring blades can be adjusted, and the specific positions of the stirring blade 20 on the connecting column 50 can be adjusted, for example, the positions needing stirring can be adjusted in real time, and the purpose of controlling the stirring positions can be achieved. The stirring blade can be a sheet metal piece.
According to an embodiment of the present application, as shown in fig. 2, the number of the stirring vanes 20 is plural, the plural stirring vanes 20 are divided into a first stirring vane 21 and a second stirring vane 22 which are distributed at intervals, and the accommodation chamber 11 is divided into the primary stirring tank 12 and the secondary stirring tank 13. A first stirring blade 21 is arranged in the first-stage stirring tank 12, a second stirring blade 22 is arranged in the second-stage stirring tank 13, and the rotating speed of the second stirring blade 22 is greater than that of the first stirring blade 21.
The first stirring blade 21 has a relatively low rotation speed, for example, 60 to 100 rpm, and the curing agent is mixed into the slurry and then preliminarily mixed.
The second stirring blade 22 has a high rotation speed, for example, 200 to 600 rpm, so that the curing agent and the slurry particles can be sufficiently mixed to ensure complete and uniform mixing.
In the present embodiment, preliminary mixing and further mixing of the mixture can be achieved by the first stirring blade 21 and the second stirring blade 22 cooperating with each other, and the degree of homogeneity of mixing can be improved by multi-step mixing.
In some embodiments of the present application, the film layer has an ester structure, a heating module is disposed in the mechanical stirrer 100, and the step S3 further includes: and S34, heating and adjusting the pH value of the mixture in the process of fully stirring and mixing the mixture to enable the mixing condition to be a weak acid condition so as to enable the film layer to be hydrolyzed and shed and enable the slurry and the curing agent to fully react. Then the pH value is adjusted to 6.5, which is beneficial to ensuring the performance of the slurry.
According to an embodiment of the present application, as shown in fig. 3, the number of the stirring blades 20 is plural, the plural stirring blades 20 include a first blade portion 23 and a second blade portion 24, ends of the first blade portion 23 and the second blade portion 24 are connected to form a connecting portion, the first blade portion 23 and the second blade portion 24 are symmetrical with respect to the connecting portion, the mechanical stirrer 100 further includes a movable plate 40, the movable plate 40 is movably disposed in the accommodating chamber 11, and the movable plate 40 is switched between a first position and a second position.
Wherein, under the condition that the movable plate 40 is located at the first position, the movable plate 40 divides the accommodation chamber 11 into the first slot 14 and the second slot 15, a through hole 41 is formed on the movable plate 40, the connecting portion passes through the through hole 41, the radial dimension of the through hole 41 is a first dimension, the first dimension is smaller than the maximum width of the first blade portion 23 and the second blade portion 24, the first blade portion 23 is located at the first slot 14, and the second blade portion 24 is located at the second slot 15. The shape of the through hole 41 is adapted to the shape of the connecting portion, and for example, both of them are cylindrical. Further, since the first blade portion 23 and the second blade portion 24 have a narrow blade shape, respectively, the cross-sectional shape of the through-hole 41 may be funnel-shaped. By defining the shape of the through hole 41, it is possible to avoid interference between the first groove 14 and the second groove 15, for example, mud is placed in the first groove 14 and curing agent is placed in the second groove 15. The slurry is stirred by the first blade portion 23 and the curing agent is stirred by the second blade portion 24, so that simultaneous stirring is realized.
With the movable plate 40 in the second position, the radial dimension of the through hole 41 is a second dimension that is greater than the first dimension.
After the movable plate 40 is moved from the first position to the second position, the size of the through-hole 41 can be increased, and the slurry in the first tank 14 and the curing agent in the second tank 15 are mixed and then sufficiently mixed by the agitating blade 20.
In addition, the first end of the movable plate 40 is connected to the inner wall of the mechanical agitator 100, and the second end of the movable plate 40 is retractable, so that the size of the through hole 41 can be adjusted. Further, the second end of the movable plate 40 can rotate around the first end of the movable plate 40, so that auxiliary stirring can be realized, and the stirring efficiency can be improved.
In some embodiments of the present application, the stirring blade 20 defines a first channel and a second channel therein, wherein the surface of the stirring blade 20 is provided with a liquid outlet hole, and the first channel is communicated with the liquid outlet hole to input the acidic solution or the alkaline solution into the accommodating cavity 11 for adjusting the pH value. By providing the liquid outlet holes on the surface of the stirring blade 20, it is beneficial to input compounds, such as acidic and alkaline solutions, or other compounds capable of controlling the reaction process of the curing agent and the slurry into the accommodating cavity 11 in real time.
The heating module is a heating wire which is positioned on the second passage and extends along the axial direction of the second passage. After the heating module is started, the heating wire can emit heat, and the heat is transferred to the slurry and/or the curing agent through the stirring blades 20, so that the control of the reaction degree of the curing agent and the slurry is realized.
The following describes a method according to an embodiment of the present application in detail with reference to specific embodiments.
Example 1
The original site of a certain obstetrical and gynecological hospital is rebuilt, the engineering place is located in the core area of the urban center, the surrounding environment is complex, the periphery is close to the existing buildings, and the southwest side is close to the operation section of a certain number of lines of the subway (the distance between a foundation pit and a subway tunnel is only 8.9 m).
The original backfilling scheme is that lime soil or plain soil is tamped, the lime soil mixing is not allowed on site due to the requirement of environmental protection, and the difficulties of carrying the soil into the engineering field and backfilling and tamping on site are large due to the project site and the central zone of the flat area, so that the two underground layers are completely backfilled by plain concrete for ensuring the construction period and the backfilling quality.
And the construction cost and the environmental protection are considered later, and the construction method of the embodiment of the application is determined to be used for backfilling, so that the construction speed is higher, and the effect is good.
Example 2
A certain commercial building project is located in a scientific and technological business area of a certain city, the periphery of a foundation pit is provided with an existing road, and pipelines are numerous. The whole excavation depth of the foundation pit is 10-11 m, two anchor rods are adopted in the design of foundation pit support, the project site is narrow, the foundation pit support is close to a red line enclosure, the vehicle traveling requirement cannot be met, the foundation pit fertilizer groove is deep and narrow, the difficulty in carrying soil into an engineering site and backfilling on site and tamping is high, the backfilling quality is difficult to guarantee, and later-period hidden dangers are easy to remain, so that the construction method is adopted for backfilling.
Because the backfill soil has higher strength and the counterforce provided by the passive area is larger, no stay plate strip is made when the anchor rod is dismantled, and the lateral horizontal displacement of the envelope structure is basically unchanged.
In summary, the method according to the embodiment of the present application has a wide application range, and can be applied to the following scenarios:
(1) The construction method of the application firstly utilizes the waste slurry as a resource, the waste slurry is used as a base material to be processed into a curing material, and the problems of slurry falling and pollution are solved.
(2) The filler obtained by the construction method has certain strength and low permeability, and can be made into retaining walls and water retaining walls and waterproof slopes, such as waterproof curtains, foundation pit slope protection, river slope surfaces and the like.
(3) The filler obtained by the construction method has the fluidity and the working performance of slurry, and can be used for foundation replacement, temporary roads, ground hardening, construction cushions and the like.
(4) The filler obtained by the construction method has self-compaction and fluidity, can be pumped and automatically flow, and can be used for backfilling and pouring of various foundation grooves, foundation pits and holes.
(5) The filler obtained by the construction method is high in early strength, short in curing time and quick in construction period. The characteristic can ensure continuous backfilling, simultaneously can ensure that the support in the foundation pit is removed along with backfilling, and can partially cancel a support plate replacement strip, thereby accelerating the construction progress. The working surface required by the deep foundation pit building waste slurry solidified backfill foundation trench is small, the construction can be performed in multiple sections at the same time, the construction speed and the process links are few, and the construction period is short.
(6) The filler obtained by the method has extremely strong fluidity and self-sealing property, the construction quality is controllable, and all gaps in narrow space and special-shaped structure space can be filled by the fluidity of the solidified backfill of the waste slurry of the deep foundation pit building. The deep foundation pit building waste mud solidified backfill has the characteristic of self-sealing, and tamping and rolling equipment is not needed during construction, so that the influence and damage of construction on a structural layer are reduced. The waste mud curing backfill material for the deep foundation pit building does not damage the waterproof layer during pouring, so that the waterproof roll of the underground structure outer wall is not required to be protected during backfilling, the construction cost is saved, and the problem that the construction cannot be protected during a small space is solved. Meanwhile, the deep foundation pit building waste slurry curing backfill material adopts an integrated construction method of on-site mixing and on-site pouring of a mechanical stirring tank, and the backfill material is uniformly stirred, has stable quality, is timely and rapid and can be operated uninterruptedly.
(7) The filler obtained by the method utilizes mechanisms of filling and consolidating soil particles by using a curing agent and the like, so that the cured soil has excellent impermeability and the permeability coefficient reaches 10 -7 -10 -8 cm/s. The characteristic can prevent the damage of underground water to the solidified soil, and can be tightly combined with a foundation structure to prevent surface water from infiltrating along the interface of the structure and the backfill soil.
(8) The filler obtained by the construction method has the characteristics of economy and environmental protection, the problems of high requirement on soil, small operation surface, high tamping difficulty, unstable tamping quality, poor combination with a foundation structure interface, incapability of ensuring subsidence after meeting water in dry construction and the like existing in the deep foundation pit building waste slurry solidification backfill foundation trench can be solved when the lime-soil backfill is adopted, the backfill effect of the foundation trench can reach the effect of plain concrete, and the manufacturing cost is far lower than that of concrete backfill. Meanwhile, sealed stirring is adopted during construction, and the material is liquid during cast-in-place, so that dust pollution cannot be generated, and the method is green and environment-friendly.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (5)
1. A deep foundation pit building waste slurry curing backfill construction method is characterized by comprising the following steps:
s1, conveying the waste slurry to a backfilling construction site;
s2, pretreating the waste slurry to obtain slurry and water with the density ratio of 1.4-1.6;
s3, respectively conveying the pretreated slurry and the curing agent to a mechanical stirrer to obtain a mixture, and fully stirring and mixing the mixture to obtain the reinforcing material, wherein the mechanical stirrer comprises: the stirring blade comprises a body, stirring blades, a driving part and a movable plate, wherein the body is internally provided with an accommodating cavity, the stirring blades are arranged in the accommodating cavity and connected with the stirring blades, the driving part is used for driving the stirring blades to rotate, the stirring blades are blade-shaped, the central positions of the stirring blades in the length direction face the directions of two ends of the stirring blades, the width of the stirring blades is gradually reduced, the included angle between the edge of the stirring blades and the axis of the stirring blades in the length direction is an acute angle, the number of the stirring blades is multiple, the stirring blades comprise a first blade part and a second blade part, the end parts of the first blade part and the second blade part are connected to form a connecting part, the first blade part and the second blade part are symmetrical relative to the connecting part, the movable plate is movably arranged in the accommodating cavity, and the movable plate is switched between a first position and a second position; under the condition that the movable plate is located at the first position, the movable plate divides the accommodating cavity into a first groove and a second groove, a through hole is formed in the movable plate, the connecting portion penetrates through the through hole, the radial size of the through hole is a first size, the first size is smaller than the maximum width of the first blade portion and the second blade portion, the first blade portion is located in the first groove, and the second blade portion is located in the second groove; the radial dimension of the through hole is a second dimension that is greater than the first dimension with the movable plate in the second position;
the curing agent comprises a mineral-based cementing material, and the mineral-based cementing material comprises an inorganic cementing material, cement and iron ore micro powder;
the step S3 comprises the following steps:
s30, dividing the curing agent into a plurality of parts from the whole;
s31, coating a film layer on the outer surface of each curing agent, wherein the raw materials of the film layer comprise a film forming agent and a hydrophobic material, the hydrophobic material comprises titanium dioxide, the film layer has an ester structure, and a heating module is arranged in the mechanical stirrer;
s32, arranging an ultraviolet light emitter in the mechanical stirrer, and converting the titanium dioxide into hydrophilic through the ultraviolet light emitter;
s33, reacting the curing agent subjected to ultraviolet light irradiation with the slurry;
and S34, heating and adjusting the pH of the mixture in the process of fully stirring and mixing the mixture to enable the mixing condition to be a weak acid condition so as to enable the film layer to be hydrolyzed and shed.
2. The deep foundation pit construction waste slurry curing backfill method according to claim 1, wherein if solid particles contained in the waste slurry in the step S2 are sandy soil, the particle size of the sandy soil is 1 mm-0.05 mm, and the content of the sandy soil is more than 50%, the step of pretreating the waste slurry comprises the following steps:
separating out part of water in the waste slurry by using a centrifugal cyclone to obtain separated water and dehydrated waste slurry which are separately placed;
and adding a part of the dehydrated water back to the dehydrated waste slurry, and blending until the density ratio of the slurry to the water is 1.4-1.6.
3. The deep foundation pit construction waste slurry curing backfill method according to claim 1, wherein if the waste slurry in the step S2 contains more than a preset amount of cohesive soil, the step of pretreating the waste slurry comprises the following steps:
standing the waste slurry in a temporary storage tank body;
removing upper floating water, testing concentration, if the density ratio of the slurry to the water is less than 1.4, adding a flocculating agent, standing, removing water, and testing specific gravity until the density ratio exceeds 1.4;
if the density ratio of the mud to the water exceeds 1.6, separating out part of water in the waste mud by using a centrifugal cyclone to obtain separated water which is placed separately and the dewatered waste mud, and adding the separated water until the density ratio of the mud to the water is 1.4-1.6.
4. The deep foundation pit building waste slurry curing backfill method according to claim 1, wherein the number of the stirring blades is multiple, the stirring blades are divided into a first stirring blade and a second stirring blade which are distributed at intervals, and the accommodating cavity is divided into:
the first-stage stirring tank is internally provided with the first stirring blade;
and the second-stage stirring tank is internally provided with second stirring blades, and the rotating speed of the second stirring blades is greater than that of the first stirring blades.
5. The deep foundation pit construction waste slurry curing backfill method according to claim 1, wherein the stirring blade defines a first channel and a second channel therein,
liquid outlet holes are formed in the surfaces of the stirring blades, and the first channel is communicated with the liquid outlet holes so as to input an acidic solution into the accommodating cavity;
the heating module is a heating wire, and the heating wire is located in the second passage and extends along the axial direction of the second passage.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002070011A (en) * | 2000-09-01 | 2002-03-08 | Tokio Kitahara | Tank car for transporting slime |
| JP2003253696A (en) * | 2002-02-28 | 2003-09-10 | Hitachi Constr Mach Co Ltd | Portable mud pelletizing device |
| CN102704496A (en) * | 2012-06-15 | 2012-10-03 | 天津济润石油海运服务有限公司 | Method for achieving slurry water separation and solidification of filling soil by utilizing filling bag and construction device |
| CN112723906A (en) * | 2021-01-21 | 2021-04-30 | 宁波大学 | Preparation and construction method of light filler based on building slurry |
| CN113415969A (en) * | 2021-06-29 | 2021-09-21 | 国网江苏省电力有限公司建设分公司 | Integrated treatment and filler utilization method for waste mud or slag in power grid construction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3246297B2 (en) * | 1995-11-13 | 2002-01-15 | 株式会社大林組 | Construction method of anticorrosion lining |
| JP3139348B2 (en) * | 1995-11-14 | 2001-02-26 | 株式会社大林組 | Manufacturing method of fiber reinforced mortar / concrete |
| JP2014124383A (en) * | 2012-12-27 | 2014-07-07 | Noritz Corp | Bathroom member |
-
2021
- 2021-11-23 CN CN202111397468.5A patent/CN114134908B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002070011A (en) * | 2000-09-01 | 2002-03-08 | Tokio Kitahara | Tank car for transporting slime |
| JP2003253696A (en) * | 2002-02-28 | 2003-09-10 | Hitachi Constr Mach Co Ltd | Portable mud pelletizing device |
| CN102704496A (en) * | 2012-06-15 | 2012-10-03 | 天津济润石油海运服务有限公司 | Method for achieving slurry water separation and solidification of filling soil by utilizing filling bag and construction device |
| CN112723906A (en) * | 2021-01-21 | 2021-04-30 | 宁波大学 | Preparation and construction method of light filler based on building slurry |
| CN113415969A (en) * | 2021-06-29 | 2021-09-21 | 国网江苏省电力有限公司建设分公司 | Integrated treatment and filler utilization method for waste mud or slag in power grid construction |
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