CN112900447A - Construction method for milling deep-layer stirring curing waterproof curtain and combining with rotary digging pile - Google Patents
Construction method for milling deep-layer stirring curing waterproof curtain and combining with rotary digging pile Download PDFInfo
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
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Abstract
The invention relates to the technical field of foundation pit supporting construction, and discloses a construction method for milling a deep stirring curing waterproof curtain and combining the deep stirring curing waterproof curtain with a rotary digging pile. The curing agent comprises 25-35 parts of cement clinker, 6-10 parts of quick lime, 20-30 parts of fly ash, 12-20 parts of desulfurized gypsum, 15-25 parts of slag micro powder, 2-5 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium carbonate, 1-2 parts of an expanding agent and 2-5 parts of a high-efficiency water reducing agent. The curing agent is mixed with water according to the raw material ratio to prepare curing agent slurry, the curing agent slurry is mixed with soil of the soil groove and then solidified into the impervious wall, and the impervious wall is cut by a milling device to form a spiral U-shaped groove. The inner wall structure of the U-shaped groove and the rotary digging pile are compactly and firmly connected in an occluded manner, so that a curtain structure with supporting and water stopping effects is formed. Through the optimized construction measures of mixing the curing agent slurry, synchronously manufacturing a soil body groove and replenishing the slurry, manufacturing an impervious wall, manufacturing a pile hole and manufacturing a waterproof curtain, the construction difficulty and the construction cost are effectively reduced.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting construction, in particular to a construction method for milling a deep stirring curing waterproof curtain and combining the deep stirring curing waterproof curtain with a rotary digging pile.
Background
In the current deep foundation pit supporting construction process, three construction processes are commonly used, namely, the combined water stop construction of a supporting pile, an inter-pile high-pressure jet grouting pile A, a supporting pile, an outer cement mixing pile C curtain and an occlusive pile. As shown in fig. 1, a reinforced concrete bored pile B is used as a support pile, after the support pile is finally set, a high-pressure jet grouting pile a is constructed among the support piles, and the support pile and the high-pressure jet grouting pile a are mutually occluded and lapped to form a support and a waterproof curtain. And secondly, as shown in fig. 2, a cast-in-place pile B and a mixing pile C are adopted, the reinforced concrete bored-in-place pile B is used as a supporting pile, after the supporting pile is finally set, a row of continuous lapped and meshed cement mixing piles C are constructed on the outer side of the supporting pile to be used as a waterproof curtain, namely, the supporting pile and the waterproof curtain are separately arranged. And thirdly, combining the plain pile D and the combined meat pile E, as shown in fig. 3, adopting a reinforced concrete bored pile B as a support pile (referred to as a plain pile for short), inserting and driving a plain concrete bored pile B between the support piles after the support piles are finally set, pouring the plain pile by adopting low-grade plain concrete without a reinforcement cage, and combining the plain pile and the plain pile to form a supporting and water-stop curtain.
However, the above three common constructions have different degrees of defects, for example, the first cast-in-place pile B + jet grouting pile a, and the jet grouting pile a between the supporting piles forms a cylindrical pile body by adopting a high-pressure cement slurry injection mode, so that the jet grouting pile a and the supporting pile cannot be meshed and overlapped to form a weak point due to insufficient injection diameter. After the foundation pit is excavated, water leakage or water seepage sites are easy to generate, and meanwhile, the construction cost of the jet grouting pile A is high, so that the construction cost is high. The second kind of filling pile B + mixing pile C, the cement mixing pile C waterproof curtain is constructed outside the filling pile, although the cost is lower, there are two disadvantages. Firstly, the construction machinery equipment capacity is limited, and the cement mixing pile C cannot be constructed in a relatively hard stratum, so that the construction depth often cannot meet the design requirement; on the other hand, the mixing piles C form a curtain only outside the support piles. However, the soil between the cast-in-place piles is not reinforced, and once the cast-in-place piles are excavated, the soil between the piles is easy to damage. The third type of occluded plain pile D + occluded meat pile E is mainly over-high in price, the soil body between the supporting piles is replaced by plain concrete piles, and the construction cost of the plain piles is over-high, so that the construction cost is high. Meanwhile, the meshed vegetable pile D and the meshed meat pile E both adopt the cast-in-place bored pile B process, so that the defect of insufficient meshing and overlapping exists locally, and water leakage is caused.
Meanwhile, cement is adopted as a guniting material in the three common foundation pit supporting construction processes, and cement paste and soil are stirred and mixed with each other to form a cement-soil wall to play a role in stopping water. However, the permeability coefficient of the cement soil wall can only reach 10- 6cm/s, which is difficult to meet for projects with higher seepage-proofing requirements, and the seepage coefficient of the seepage-proofing wall needs to reach 10-7The cm/s can meet the engineering with higher seepage-proofing requirement.
Disclosure of Invention
The invention aims to provide a construction method for milling a deep-layer stirring curing waterproof curtain and combining the same with a rotary digging pile, and aims to solve the problems that in the prior art, a foundation pit supporting waterproof curtain is easy to leak water and seep water, the structure between an impervious wall and a supporting pile is not occluded and lapped enough, the construction difficulty is high, the construction cost is high and the like.
The milling deep-layer stirring curing waterproof curtain comprises a curing agent and rotary excavating piles. The main components of the curing agent comprise 25-35 parts of cement clinker, 6-10 parts of quick lime, 20-30 parts of fly ash, 12-20 parts of desulfurized gypsum, 15-25 parts of slag micro powder, 2-5 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium carbonate, 1-2 parts of an expanding agent and 2-5 parts of a high-efficiency water reducing agent. The curing agent is mixed with water according to the raw material proportion to prepare curing agent slurry, the curing agent slurry is mixed with soil of the soil groove and then solidified into an impervious wall, and the impervious wall and the rotary excavating pile are mutually meshed and connected to form a waterproof curtain structure.
Furthermore, the curing agent slurry is prepared by the curing agent according to the raw material proportion and the water cement ratio of 8-10%.
Further, the soil body groove is formed by cutting in the stratum through a milling device; compressed gas and the curing agent slurry are respectively conveyed into the soil body groove through an air compressor and an injection machine, and the curing agent slurry is mixed with the soil body of the soil body groove and is solidified into the impervious wall.
Further, on the opposite side of the impervious wall and the impervious wall, a sleeve milling joint is formed by cutting when a rotary drilling rig is used for rotary drilling of a pile hole of the pile, and a steel reinforcement cage and concrete are filled into the pile hole to form the rotary drilling pile.
Further, the water-stop curtain has a permeability coefficient of 10-7cm/s, 28d strength is more than or equal to 2.0 Mpa.
A construction method for combining a solidified waterproof curtain with a rotary digging pile comprises the following construction measures:
s1, mixing of curing agent slurry: and (2) injecting clear water into the stirring barrel, calculating the dosage of the required curing agent according to the raw material proportion of the curing agent and the water-cement ratio of 8-10%, and then sequentially adding the raw materials into the clear water to stir for more than or equal to 20 min.
S2, drilling to manufacture a soil body groove: the air compressor and the jet machine are connected with the milling device, the milling device is started to drill down to a construction stratum to manufacture a soil body groove, the delivery pump is started to deliver curing agent slurry to the bottom of the milling device, and meanwhile, the air compressor is started to deliver compressed gas to the bottom of the milling device. The curing agent slurry and the compressed air are vertically sprayed into the soil body groove from the middle part of the milling wheel of the milling device and are mixed with soil body particles cut by the milling wheel to form the mixed curing agent slurry in a flowing state, and the curing agent slurry is continuously and uniformly stirred under the action of the churning lifting convection of the compressed air and along with the continuous rotation of the milling wheel.
S3, lifting and stirring: and after the milling wheels drill downwards to the designed elevation, the speed control of the stirring milling wheels is started to be lifted, the two milling wheels start to rotate relatively, and the curing agent slurry and the compressed gas are continuously injected into the soil body groove in a supplementing mode.
S4, manufacturing the impervious wall: and after the milling wheel is lifted to the orifice, the curing agent slurry is mixed with the soil body of the soil body groove and is cured into the impervious wall.
S5, pile hole manufacturing: and rotary drilling pile holes are formed in the opposite sides between two adjacent impervious walls through a rotary drilling rig, and sleeve milling joints are formed on the side walls of the impervious walls in a cutting mode.
S6, manufacturing a waterproof curtain: after drilling and hole cleaning are finished according to design requirements, the rotary drilling rig lifts a reinforcement cage in a pile hole, transfers a pouring guide pipe, pours concrete, forms a rotary drilling pile after maintenance, and the rotary drilling pile and the impervious wall are pressed together and embedded to form a waterproof curtain for supporting and stopping water.
Further, in the step S2, the delivery pressure value of the delivery pump is 2-3MPa, and the delivery pump flow is 200-; the pressure value of the compressed gas delivered by the air compressor is 0.8-1 Mpa.
Further, in steps S3 to S4, the two cutterheads are rotated in opposite directions when drilling downward, and the two cutterheads are rotated relatively when reaching the bottom of the designed slot and needing to be lifted.
Further, in step S5, the rotary drilling rig cuts the inner side wall of the impervious wall by a cutting pick to form a U-shaped groove with a spiral shape; the cutting thickness of the inner side wall of the impervious wall is 300-400 mm.
Furthermore, the rotary digging piles are meshed and embedded along the spiral U-shaped groove of the impervious wall to form a waterproof curtain structure.
Compared with the prior art, the construction method for milling, deeply stirring and curing the waterproof curtain and combining the waterproof curtain with the rotary digging pile comprises curing agents and the rotary digging pile. The main components of the curing agent comprise 25-35 parts of cement clinker, 6-10 parts of quick lime, 20-30 parts of fly ash, 12-20 parts of desulfurized gypsum, 15-25 parts of slag micro powder, 2-5 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium carbonate, 1-2 parts of an expanding agent and 2-5 parts of a high-efficiency water reducing agent. The curing agent is mixed with water according to the raw material proportion to prepare curing agent slurry, the curing agent slurry is mixed with soil of the soil groove and then solidified into the impervious wall, and the impervious wall is cut by a milling device to form a spiral U-shaped groove. The U-shaped groove inner wall structure and the rotary digging pile are compactly and firmly connected in an occluded manner, and a curtain structure with supporting and water stopping effects is formed. And the construction difficulty and the construction cost are effectively reduced by optimized construction measures of mixing the curing agent slurry, synchronously manufacturing a soil body groove and replenishing the slurry, manufacturing an impervious wall, manufacturing a pile hole and manufacturing a waterproof curtain.
Drawings
FIG. 1 is a schematic structural view of a cast-in-place pile and a jet grouting pile in foundation pit supporting construction in the prior art;
FIG. 2 is a schematic structural view of a cast-in-place pile and a mixing pile in the prior art of foundation pit support construction;
FIG. 3 is a schematic structural view of an occluded plain pile and an occluded meat pile in foundation pit support construction in the prior art;
FIG. 4 is a schematic structural diagram of connection of a rotary excavating soil body groove and a rotary excavating pile on the side surface of the impervious wall;
FIG. 5 is a schematic view of the connection relationship of the cut-off wall and the rotary excavating pile to form a milling joint in the invention;
FIG. 6 is a schematic structural view of a spiral U-shaped groove on the inner wall of the diaphragm wall or the wall of the rotary excavating pile hole in the invention.
In the figure: 01-impervious wall, 02-rotary digging pile, 03-milling joint, 04-pile hole and 041-U-shaped groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The invention provides a construction method for milling a deep-layer stirring curing waterproof curtain and combining the same with a rotary digging pile 02, and as shown in figures 4 to 6, the construction method for milling the deep-layer stirring curing waterproof curtain and combining the same with the rotary digging pile 02 comprises a curing agent and the rotary digging pile 02. The main components of the curing agent comprise 25-35 parts of cement clinker, 6-10 parts of quick lime, 20-30 parts of fly ash, 12-20 parts of desulfurized gypsum, 15-25 parts of slag micro powder, 2-5 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium carbonate, 1-2 parts of an expanding agent and 2-5 parts of a high-efficiency water reducing agent. The curing agent is mixed with water according to the raw material proportion to prepare curing agent slurry. Preferably, in practical application, 1000kg of tap water is injected into the stirring barrel, or the water injection amount is half of the volume of the stirring barrel, and then the raw materials are sequentially added according to the proportion. The required curing agent dosage is calculated according to the proportion of 8-10% of the water-cement ratio, and the corresponding curing agent proportion is as follows: 280kg of cement clinker, 80kg of quick lime, 250kg of fly ash, 140kg of desulfurized gypsum, 180kg of slag micro powder, 20kg of sodium dodecyl benzene sulfonate, 20kg of sodium carbonate, 10kg of expanding agent and 20kg of high-efficiency water reducing agent.
Stirring and mixing for more than or equal to 20min according to the optimal raw material proportion, pumping and discharging into a slurry storage barrel after the stirring of each barrel is finished, and continuously stirring by a stirrer in the slurry storage barrel to prevent the precipitation of the curing agent slurry. And after the preparation of the curing agent slurry is finished, conveying the curing agent slurry to a soil body groove for mixing treatment, and forming the impervious wall 01 after solidification. The impervious wall 01 is cut by a milling device to form a spiral U-shaped groove 041. The inner wall structure of the U-shaped groove 041 and the rotary digging pile 02 are compactly and firmly connected in an occluded manner, and a curtain structure with supporting and water stopping effects is formed. And moreover, through the optimized construction measures of mixing curing agent slurry, synchronously manufacturing a soil body groove and replenishing slurry, manufacturing a seepage-proof wall 01, manufacturing a pile hole 04 and manufacturing a waterproof curtain, the construction difficulty and the construction cost are effectively reduced.
Specific embodiments are described below with respect to the corresponding schemes of the above figures:
first embodiment
In this embodiment, referring to fig. 4 to 6, in the construction method for milling, deeply stirring, curing and solidifying the waterproof curtain and combining with the rotary digging pile 02, the adopted curing agent is prepared by optimizing the raw material ratio and the construction measures. Specifically, the main components of the curing agent comprise 25-35% of cement clinker, 6-10% of quick lime, 20-30% of fly ash, 12-20% of desulfurized gypsum, 15-25% of slag micropowder, 2-5% of sodium dodecyl benzene sulfonate, 2-5% of sodium carbonate, 1-2% of expanding agent and 2-5% of high-efficiency water reducing agent, and the water-cement ratio is 8-10%.
In the curing agent, the cement clinker has the function of improving the structural property of soil, and after the cement clinker is doped into the soil body, the cement clinker can generate hydrolysis and hydration reactions under the participation of water to generate hydrated hydrate. The hydrated hydrate can generate a series of physical and chemical reactions with clay particles to form a set cement framework, so that the strength and the stability of the soil are improved. The physicochemical action of Ca (OH)2 in the hydrated hydrate in turn causes the clay particles to form stable particles which are held together by the set of cement and form a body of some strength.
The fly ash is a powdery pozzolanic material which is finer than cement clinker, contains a large amount of active SiO2, Al2O3, Fe2O3, CaO and the like, and the content of SiO2, Al2O3 and Fe2O3 is usually more than 75%. Wherein, SiO2 and Al2O3 have high content and high activity, and can react with Ca (OH)2 released during the hydration of cement clinker to generate hydrated calcium aluminate and hydrated calcium silicate gel, thereby further promoting the hardening of cement and improving the strength. Meanwhile, the micro-bead effect of the fly ash can change the rheological property of cement clinker, so that the reinforced soil is easy to be uniformly mixed and compact, the pores of the reinforced soil are reduced, and the pore diameter is reduced. The dispersion effect of the fly ash on the cement clinker can promote the hydration reaction of the cement clinker. On the other hand, the fly ash also plays a filling role, and fine particles of the fly ash are filled into pores of the solidified soil, so that the strength of the solidified soil is improved.
The quick lime is mainly used for absorbing water and generating larger heat, so that the slurry is in an environment with higher temperature, and the chemical reaction speed and effect among particles are favorably improved. When the quicklime and the soil are sufficiently stirred and mixed, a series of chemical reactions and physicochemical reactions occur, and at this time, calcium hydroxide crystallization reaction, ion exchange reaction, pozzolan reaction, carbonation reaction and the like are mainly performed. The volcanic ash reaction in the cement causes the culture minerals and active silicon in the soil to be dissociated under the alkaline excitation of lime, and the calcium silicate reacts with Ca (OH)2 under the participation of water to generate cement such as hydrous calcium aluminate and calcium silicate. The cement is slowly converted from a gel state to a crystal state, so that the rigidity of the quicklime soil is gradually increased, and the water stability and the strength are correspondingly improved.
The desulfurized gypsum, the desulfurized gypsum and the cement clinker jointly act with soil, have double functions of consolidating soil particles and expanding and filling pores, are ideal curing agent materials for reinforcing loose soft soil with high pore ratio, and can obtain good reinforcing effect especially for fine-particle soil such as peat soil, silt soil and the like which are not good in reinforcing effect by only using the cement clinker.
The slag micro powder has activity, and after the cement clinker is mixed in the slag micro powder, the hydration speed of the slag micro powder is accelerated due to an alkaline environment generated by the hydration of the cement clinker, and the early strength of a hydration product is obviously improved. Particularly, the specific surface area of the separately ground slag micro powder is higher than 350m2/kg, and the hydration activity of the separately ground slag micro powder is greatly increased. The hydration product amount of the slag micro powder is increased rapidly, and the compressive strength of the solidified product is improved after hydration is finished. If alkaline materials such as cement clinker, desulfurized gypsum and the like are added, the concentration of hydroxyl ions in a composite system is increased, and high-concentration OH-reacts with Ca2+ and Mg2+ on the surface of the calcium-rich phase of the slag micro powder to generate Ca (OH)2 and Mg (OH) 2. The calcium-rich phase of the slag micro powder is dissolved, the surface of the glass body is damaged, the silicon-rich phase is exposed, and Ca (OH)2 and active SiO2 in the exposed silicon-rich phase can generate chemical reaction to generate calcium silicate hydrate gel. As the reaction proceeds gradually, the amount of calcium silicate hydrate gel formed increases gradually, calcium silicate hydrate (C-S-H) gel begins to bind some unreacted particles and is deposited together, the water content in the slurry decreases gradually and hardens, and the hardened slurry rapidly increases in strength and finally becomes a brittle hardened body.
The supporting and water-stopping effects of the water-stopping curtain are optimized through specific construction measures, and the construction difficulty and the construction cost are reduced. In this embodiment, the construction method of combining the waterproof curtain with the rotary digging pile 02 includes the following construction measures:
s1, mixing of curing agent slurry: and (2) injecting clear water into the stirring barrel, calculating the dosage of the required curing agent according to the raw material proportion of the curing agent and the water-cement ratio of 8-10%, and then sequentially adding the raw materials into the clear water to stir for more than or equal to 20 min.
S2, drilling to manufacture a soil body groove: the milling device is provided with two wheels, and the milling device is started to make soil body grooves by utilizing the two wheels to drill downwards to a construction stratum. And starting a delivery pump to deliver curing agent slurry to the bottom of the milling device, and simultaneously starting the air compressor to deliver compressed air to the bottom of the milling device. The curing agent slurry and the compressed air are vertically sprayed into the soil body groove from the middle part of the milling wheel of the milling device and are mixed with soil body particles cut by the milling wheel to form the mixed curing agent slurry in a flowing state, and the curing agent slurry is continuously and uniformly stirred under the action of the churning lifting convection of the compressed air and along with the continuous rotation of the milling wheel.
S3, lifting and stirring: and when the milling wheels drill downwards to the designed elevation, starting to lift the stirring milling wheels for speed control, wherein the two milling wheels start to rotate relatively, and the curing agent slurry and the compressed gas are continuously injected into the soil body groove in a supplementing manner.
S4, manufacturing the impervious wall 01: and after the milling wheel is lifted to the orifice, the curing agent slurry is mixed with the soil body of the soil body groove and is cured into the impervious wall 01.
S5, manufacturing a pile hole 04: and rotary drilling piles 02 holes are formed in the opposite sides between two adjacent impervious walls 01 through a rotary drilling rig, and milling joints 03 are formed on the side walls of the impervious walls 01 in a cutting mode.
S6, manufacturing a waterproof curtain: after drilling and hole cleaning are finished according to design requirements, the rotary drilling rig lifts a reinforcement cage into the pile hole 04, puts down a pouring guide pipe, pours concrete, and forms the rotary drilling pile 02 after maintenance. The rotary excavating pile 02 and the impervious wall 01 are pressed and embedded mutually to form a waterproof curtain for supporting and water stopping. The permeability coefficient of the waterproof curtain is 10-7cm/s, 28d strength is more than or equal to 2.0 Mpa.
According to the construction measures of the combination of the solidified waterproof curtain and the rotary digging pile 02, it is clear that:
the milling device preferably adopts a double-wheel milling and stirring pile machine, and the air compressor and the jet machine are both connected to the double-wheel head of the milling device through a wind pressure conveying pipe.
In the step S2, the delivery pressure value of the delivery pump is 2-3Mpa, and the flow rate of the delivery pump is 200-300L/min; the pressure value of the compressed gas delivered by the air compressor is 0.8-1 Mpa. The curing agent slurry and soil particles cut by the milling wheel are mixed to form a flowing mixed slurry, and the mixed slurry is continuously and uniformly stirred along with the continuous rotation of the milling wheel under the action of the tumbling and lifting convection of compressed air. While the larger soil particles are further crushed into fine particles to be mixed in the slurry.
And in the steps from S3 to S4, after the milling wheel drills to the designed elevation of the impervious wall 01, the speed of the lifting double wheel is controlled to be 0.6-0.8 m/min. Specifically, the two milling wheels rotate in opposite directions when drilling and cutting downwards, and the two milling wheels rotate relatively when reaching the bottom of the designed slotted hole and needing to be lifted.
When the milling wheels are lifted, the two milling wheels start to rotate relatively, and meanwhile, the curing agent slurry and the compressed air are vertically and continuously sprayed downwards from the middle positions of the two milling wheels, so that the curing agent slurry in the formed soil body slotted holes is continuously supplemented. The larger particles in the mixed slurry are further crushed into fine particles by the milling wheel and the compressed air, and the fine particles in the mixed slurry are lifted to the top of the slotted hole under the action of the rotating force of the milling wheel and the lifting action of the compressed air. Then the curing agent and the soil in the mixed slurry are fully stirred and mixed by sinking into the bottom of the slot from the two sides of the slot in cycles to form convection in the slot of the soil body. Preferably, the amount of the reinforcing agent used is calculated according to the flow meter of the mixed slurry during the drilling or lifting process, and the curing agent is configured to be 20-25% of the weight of the reinforced soil body.
After the double wheels of the milling device are lifted to the opening, the construction of one set of the cut-off walls 01 is completed, and then the adjacent cut-off walls 01 can be ready for construction. After two adjacent impervious walls 01 are maintained for three days, the rotary excavating pile 02 in the middle of construction can be constructed when the unconfined compressive strength reaches over 0.6 Mpa.
Referring to fig. 4 to 5, in steps S5 to S6, after the diaphragm wall 01 is maintained for three days according to the standard diaphragm wall 01 completed in step S4, the inner side wall of the diaphragm wall 01 is cut by the cutting teeth of the rotary drilling rig to form a U-shaped groove 041 having a spiral shape. And constructing a pile hole 04 of the rotary digging pile 02 between two adjacent anti-seepage walls 01 through the cylindrical drill of the hard alloy cutting teeth of the rotary digging drill, wherein the rotary digging pile 02 is used as a foundation pit support pile. The side walls of the impervious walls 01 at the two sides of each support pile are cut to the thickness of 300-400 mm.
Due to the downward rotary cutting of the drum drill with the cutting pick, the cutting toolThe impervious wall 01 on the two sides is cut to form a spiral U-shaped groove 041, when a reinforcement cage is hoisted into the pile hole 04, a pouring guide pipe is put down, concrete is poured, mortar in the concrete enters the U-shaped groove 041 to be embedded and tightly with the impervious wall 01, and a rotary excavating pile 02 is formed after twenty-eight days of maintenance, so that a better impervious effect is achieved. Or, the rotary excavating piles 02 are engaged and embedded along the spiral U-shaped groove 041 of the impervious wall 01 to form water-stop curtain structures, and the permeability coefficient of each water-stop curtain structure is 10-7cm/s, 28d strength is more than or equal to 2.0 Mpa.
According to the construction measures from S1 to S6, 1000kg of tap water is preferably injected, and the curing agent is prepared from 290kg of cement clinker, 70kg of quick lime, 240kg of fly ash, 160kg of desulfurized gypsum, 200kg of slag micro powder, 15kg of sodium dodecyl benzene sulfonate, 18kg of sodium carbonate, 8kg of expanding agent and 16kg of high-efficiency water reducing agent. The raw materials of the curing agent are sequentially scattered into tap water according to the mixture ratio and are uniformly mixed and stirred for more than or equal to 20 min. To obtain a curing agent slurry. Then, common clay is adopted for mixing, the water content of the clay is about 25-35%, and the mixing amount is that 230kg of curing agent slurry and 200kg of tap water are mixed in each ton of clay. Mixing the clay and the curing agent slurry, stirring, soaking in water at room temperature for seven days, and measuring the unconfined compressive strength of the mixture to be 1.9 Mpa.
Second embodiment
The same parts as those in the first embodiment are not described again, and according to the above construction measures from S1 to S6, preferably, in the foundation pit supporting engineering, the ratio of the curing agent to the raw materials of each ton of the reinforced soil body is: 60kg of cement clinker, 13kg of quick lime, 46kg of fly ash, 30kg of desulfurized gypsum, 40kg of slag micro powder, 3kg of sodium dodecyl benzene sulfonate, 4kg of sodium carbonate, 1.5kg of expanding agent and 3kg of high-efficiency water reducing agent. Injecting 200kg of tap water, and stirring with a stirrer for more than or equal to 20min to obtain curing agent slurry. And mixing and curing the prepared curing agent slurry and the soil body of the soil body groove to form the impervious wall 01, and drilling and core pulling the impervious wall 01 after twenty-eight days to obtain a plurality of core samples for a compression test, wherein the unconfined compression strength of the test is 1.6-2.5 Mpa.
According to the technical scheme of the embodiment, the impervious wall 01 formed by mixing and solidifying the determined proportioning curing agent slurry and the soil body of the soil body groove is adopted, the impervious wall 01 and the rotary digging pile 02 are mutually meshed, embedded and connected to form a waterproof curtain mechanism, and the formed waterproof curtain has the effects of supporting and water stopping.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The milling deep-layer stirring solidification waterproof curtain is characterized by comprising a curing agent and a rotary digging pile, wherein the curing agent mainly comprises 25-35 parts of cement clinker, 6-10 parts of quick lime, 20-30 parts of fly ash, 12-20 parts of desulfurized gypsum, 15-25 parts of slag micro powder, 2-5 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium carbonate, 1-2 parts of an expanding agent and 2-5 parts of a high-efficiency water reducing agent;
the curing agent is mixed with water according to the raw material proportion to prepare curing agent slurry, the curing agent slurry is mixed with soil of the soil groove and then solidified into an impervious wall, and the impervious wall and the rotary excavating pile are mutually meshed and connected to form a waterproof curtain structure.
2. The milling deep stirring curing waterproof curtain as claimed in claim 1, wherein the curing agent slurry is prepared by the curing agent according to the raw material ratio and the water cement ratio of 8-10%.
3. The milled deep stirred solidified waterproof curtain of claim 2, wherein the soil body groove is cut in the stratum by a milling device;
compressed gas and the curing agent slurry are respectively conveyed into the soil body groove through an air compressor and an injection machine, and the curing agent slurry is mixed with the soil body of the soil body groove and is solidified into the impervious wall.
4. The milling deep-stirring curing waterproof curtain as claimed in claim 3, wherein the opposite sides of the impervious wall and the impervious wall are cut to form a milling joint when a pile hole of a rotary pile is drilled by a rotary drilling rig, and a reinforcement cage and concrete are filled into the pile hole to form the rotary pile.
5. The milled deep stirred solidified waterproof curtain of claim 4, wherein the waterproof curtain has a permeability coefficient of 10-7cm/s, 28d strength is more than or equal to 2.0 Mpa.
6. A construction method related to the combination of the solidified waterproof curtain and the rotary digging pile as claimed in any one of claims 1 to 5 is characterized by comprising the following construction measures:
s1, mixing of curing agent slurry: injecting clear water into a stirring barrel, calculating the dosage of the required curing agent according to the raw material proportion of the curing agent and the water-cement ratio of 8-10%, and then sequentially adding the raw materials into the clear water to stir for more than or equal to 20 min;
s2, drilling to manufacture a soil body groove: the air compressor and the jet machine are both connected with the milling device, the milling device is started to drill down to a construction stratum to manufacture a soil body groove, the delivery pump is started to deliver curing agent slurry to the bottom of the milling device, and the air compressor is started to deliver compressed gas to the bottom of the milling device;
the curing agent slurry and the compressed air are vertically sprayed into a soil body groove from the middle part of a milling wheel of the milling device and are mixed with soil body particles cut by the milling wheel to form a flowing mixed curing agent slurry, and the curing agent slurry is continuously and uniformly stirred under the action of the churning lifting convection of the compressed air and along with the continuous rotation of the milling wheel;
s3, lifting and stirring: after the milling wheels drill downwards to the designed elevation, the speed control of the stirring milling wheels is started to be lifted, the two milling wheels start to rotate relatively, and meanwhile, the curing agent slurry and the compressed gas are injected into the soil body groove continuously;
s4, manufacturing the impervious wall: after the milling wheel is lifted to the orifice, the curing agent slurry is mixed with the soil body groove and is cured into an impervious wall;
s5, pile hole manufacturing: rotary drilling pile holes through a rotary drilling rig on the opposite sides between two adjacent impervious walls, and cutting the side walls of the impervious walls to form sleeve milling joints;
s6, manufacturing a waterproof curtain: after drilling and hole cleaning are finished according to design requirements, the rotary drilling rig lifts a reinforcement cage in a pile hole, transfers a pouring guide pipe, pours concrete, forms a rotary drilling pile after maintenance, and the rotary drilling pile and the impervious wall are pressed together and embedded to form a waterproof curtain for supporting and stopping water.
7. The construction method of the combination of the solidified waterproof curtain and the rotary excavating pile as claimed in claim 6, wherein in the step S2, the delivery pressure value of the delivery pump is 2-3Mpa, and the flow rate of the delivery pump is 200-; the pressure value of the compressed gas delivered by the air compressor is 0.8-1 Mpa.
8. The construction method of the solidified waterproof curtain combined with the rotary excavating pile according to claim 6, wherein in the steps S3 to S4, the two milling wheels are rotated in opposite directions when drilling and cutting downwards, and the two milling wheels are rotated relatively when reaching the bottom of the designed hole and needing to be lifted.
9. The construction method of the combination of the solidified waterproof curtain and the rotary excavating pile as claimed in claim 6, wherein in the step S5, the rotary excavating drilling machine cuts the inner side wall of the impervious wall by a cutting pick to form a U-shaped groove with a spiral shape;
the cutting thickness of the inner side wall of the impervious wall is 300-400 mm.
10. The construction method of the combination of the curing waterproof curtain and the rotary excavating pile as claimed in claim 9, wherein the rotary excavating pile is engaged and embedded along the spiral U-shaped groove of the impervious wall to form a waterproof curtain structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653083A (en) * | 2021-08-16 | 2021-11-16 | 北京市市政一建设工程有限责任公司 | Construction process of grouting waterproof curtain |
| CN114592506A (en) * | 2022-03-11 | 2022-06-07 | 深圳宏业基岩土科技股份有限公司 | Low-permeability flow-state stable soil construction method for water leakage treatment of prestressed pipe pile |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2810880A1 (en) * | 1978-03-13 | 1979-09-27 | Brechtel Johannes | Protecting excavation from ground water - by building slit wall around area to be dug using cementitious slurry |
| CN102153326A (en) * | 2010-12-08 | 2011-08-17 | 武汉高铁桩工科技有限公司 | Curing agent for soft soil and application thereof |
| CN105887905A (en) * | 2016-04-21 | 2016-08-24 | 中亿丰建设集团股份有限公司 | Construction method for milling cement soil stirring wall waterproof curtain through double wheels |
| CN108005088A (en) * | 2018-01-22 | 2018-05-08 | 上海智平基础工程有限公司 | A kind of cross-section foundation pit supporting construction and its construction method |
| CN109761575A (en) * | 2019-03-06 | 2019-05-17 | 山东大学 | A kind of TRD diaphragm wall curing agent and its application method and application |
| CN110080249A (en) * | 2019-06-14 | 2019-08-02 | 上海智平基础工程有限公司 | A kind of pressure filling formula Diaphragm Wall Support Structure and its construction method |
-
2021
- 2021-01-19 CN CN202110071820.XA patent/CN112900447A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2810880A1 (en) * | 1978-03-13 | 1979-09-27 | Brechtel Johannes | Protecting excavation from ground water - by building slit wall around area to be dug using cementitious slurry |
| CN102153326A (en) * | 2010-12-08 | 2011-08-17 | 武汉高铁桩工科技有限公司 | Curing agent for soft soil and application thereof |
| CN105887905A (en) * | 2016-04-21 | 2016-08-24 | 中亿丰建设集团股份有限公司 | Construction method for milling cement soil stirring wall waterproof curtain through double wheels |
| CN108005088A (en) * | 2018-01-22 | 2018-05-08 | 上海智平基础工程有限公司 | A kind of cross-section foundation pit supporting construction and its construction method |
| CN109761575A (en) * | 2019-03-06 | 2019-05-17 | 山东大学 | A kind of TRD diaphragm wall curing agent and its application method and application |
| CN110080249A (en) * | 2019-06-14 | 2019-08-02 | 上海智平基础工程有限公司 | A kind of pressure filling formula Diaphragm Wall Support Structure and its construction method |
Non-Patent Citations (2)
| Title |
|---|
| 丁毅: "《土壤固化及其应用》", 30 June 2009, 中国大地出版社 * |
| 刘军等: "双轮铣深层搅拌工法止水帷幕在深基坑围护中的应用", 《建筑施工》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653083A (en) * | 2021-08-16 | 2021-11-16 | 北京市市政一建设工程有限责任公司 | Construction process of grouting waterproof curtain |
| CN113653083B (en) * | 2021-08-16 | 2022-11-04 | 北京市市政一建设工程有限责任公司 | Construction process of grouting waterproof curtain |
| CN114592506A (en) * | 2022-03-11 | 2022-06-07 | 深圳宏业基岩土科技股份有限公司 | Low-permeability flow-state stable soil construction method for water leakage treatment of prestressed pipe pile |
| CN114592506B (en) * | 2022-03-11 | 2024-01-02 | 深圳宏业基岩土科技股份有限公司 | Construction method for low-permeability fluid stabilized soil for water leakage treatment of prestressed pipe pile |
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