CN114592506A - Low-permeability flow-state stable soil construction method for water leakage treatment of prestressed pipe pile - Google Patents
Low-permeability flow-state stable soil construction method for water leakage treatment of prestressed pipe pile Download PDFInfo
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- CN114592506A CN114592506A CN202210243465.4A CN202210243465A CN114592506A CN 114592506 A CN114592506 A CN 114592506A CN 202210243465 A CN202210243465 A CN 202210243465A CN 114592506 A CN114592506 A CN 114592506A
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- soil
- stirring
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- parts
- pipe pile
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- 239000002689 soil Substances 0.000 title claims abstract description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 103
- 239000000843 powder Substances 0.000 claims abstract description 94
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 49
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 24
- 239000010440 gypsum Substances 0.000 claims abstract description 24
- 239000002893 slag Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 238000011049 filling Methods 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 14
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229940080314 sodium bentonite Drugs 0.000 claims abstract description 11
- 229910000280 sodium bentonite Inorganic materials 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 14
- 239000011707 mineral Substances 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000006227 byproduct Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims description 3
- 239000010811 mineral waste Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229910021647 smectite Inorganic materials 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 16
- 238000002156 mixing Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 239000008399 tap water Substances 0.000 abstract description 2
- 235000020679 tap water Nutrition 0.000 abstract description 2
- -1 aluminum ions Chemical class 0.000 description 17
- 229910052918 calcium silicate Inorganic materials 0.000 description 12
- 235000012241 calcium silicate Nutrition 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 239000000378 calcium silicate Substances 0.000 description 10
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 10
- 239000013078 crystal Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 229910001653 ettringite Inorganic materials 0.000 description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 8
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 7
- 229910052901 montmorillonite Inorganic materials 0.000 description 7
- 239000008187 granular material Substances 0.000 description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 230000010412 perfusion Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 4
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000003487 anti-permeability effect Effects 0.000 description 3
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003837 high-temperature calcination Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 229940092782 bentonite Drugs 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 239000011405 expansive cement Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- E02D5/58—Prestressed concrete piles
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
-
- 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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
-
- 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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
-
- 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
-
- 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
Abstract
The invention relates to the technical field of foundation reinforcement and discloses a low-permeability flow state stabilized soil construction method for water leakage treatment of a prestressed pipe pile, wherein a filling pipe and a filling hopper are arranged inside a pipe pile group, and a bottom-sealing concrete layer is filled into the pipe pile group through the filling hopper and the filling pipe to seal the bottom of the pipe pile group; then pouring super-fluid stable soil; the stabilizing soil comprises the following stabilizing powder in parts by weight: 10-15 parts of cement, 40-60 parts of slag micro powder, 10-20 parts of desulfurized gypsum, 15-25 parts of fly ash, 5-10 parts of silica fume, 5-10 parts of sodium bentonite, 5-10 parts of sodium silicate and 2-6 parts of an expanding agent; mixing the stabilizing powder with water and soil, and stirring to form superfluid stabilizing soil; therefore, the soil can be directly obtained at a construction site, the water body can be directly tap water, and all components of the stable powder are common sales commodities in the market, are cheap and easy to obtain, so that the manufacturing cost is low.
Description
Technical Field
The invention relates to the technical field of foundation reinforcement, in particular to a low-permeability flow state stabilized soil construction method for water leakage treatment of a prestressed pipe pile.
Background
At present, the prestressed pipe pile is a reinforced concrete hollow pipe pile manufactured by adopting a centrifugal method in a factory, thicker circular steel plates are arranged at two ends of the prestressed pipe pile, on one hand, the end parts are protected, on the other hand, mutual butt welding is convenient, large mechanical equipment such as a diesel hammer or a hydraulic hammer is generally adopted to drive the prestressed pipe pile into foundation soil for a certain depth, and because the prestressed pipe pile is of a hollow structure, after the prestressed pipe pile is driven into the designed depth by hammering, a worker can immediately pour concrete or mortar into the pile bottom to seal the pile bottom, so that the phenomenon that underground water in the soil below the bottom of the prestressed pipe pile permeates into the prestressed pipe pile through gaps between the steel plates at the end part of the prestressed pipe pile and corrodes the prestressed pipe pile is avoided.
Because the prestressed pipe piles are generally processed into standard lengths of 9, 12 and 14m in a factory and transported to a construction site, but the designed pile length may reach 20m, even more than 40m, the construction is usually performed by adopting a sectional splicing mode, namely, when one section of prestressed pipe pile is driven, the top of the section of prestressed pipe pile is welded and connected with the protective steel plate at the bottom of the next section of prestressed pipe pile, and then the prestressed pipe pile is continuously driven into the ground by hammering until the design depth is reached. Because the welded connection department is formed by two circular steel sheet welding, meet hard intermediate layer or the uneven stratum of hardness at the hammering in-process of beating, can make the stress tube stake bear the tension and compression cyclic stress and produce the crack because of hammering vibration repeatedly, if these cracks are not handled, groundwater can be followed the crack infiltration and get into the stress tube stake inner wall in advance, accumulate in stress tube stake inner wall space in advance, cause the corruption to the stress tube stake in advance.
For the crack leakage generated in the process of hammering and driving the prestressed pipe pile, the traditional treatment method is to pour micro-expansion concrete or micro-expansion mortar into the center of the prestressed pipe pile, and after the concrete or mortar is solidified, the crack leakage of the prestressed pipe pile can be prevented.
Disclosure of Invention
The invention aims to provide a low-permeability fluid-state stabilized soil construction method for water leakage treatment of a prestressed pipe pile, and aims to solve the problem that the cost for treating the water leakage of the prestressed pipe pile is high in the prior art.
The invention is realized in this way, the low-permeability flow state stabilized soil construction method of the water leakage treatment of the prestressed pipe pile, set up the perfusion conduit in the pipe pile group of the depth set into soil horizon, the top of the said perfusion conduit connects with the perfusion hopper, pour into the inside of the pipe pile group and seal the bottom concrete layer through perfusion hopper and perfusion conduit, the said bottom concrete layer is formed in the inferior part of the pipe pile group, and seal the bottom of the pipe pile group;
pouring superfluid stabilized soil into the tubular pile group through the pouring hopper and the pouring guide pipe to form a stabilized soil layer on the bottom sealing concrete layer; the tubular pile group comprises a plurality of tubular piles which are butted up and down in sequence, annular butt joint steel plates are arranged at the end parts of the tubular piles, and adjacent tubular piles are butted through the butt joint steel plates at the end parts;
the stabilized soil comprises the following stabilized powders in parts by weight: 10-15 parts of cement, 40-60 parts of slag micro powder, 10-20 parts of desulfurized gypsum, 15-25 parts of fly ash, 5-10 parts of silica fume, 5-10 parts of sodium bentonite, 5-10 parts of sodium silicate and 2-6 parts of an expanding agent; and the stabilizing powder is mixed with water and soil and then stirred to form super-fluidized stabilizing soil.
Furthermore, the cement is Portland cement with the strength of 42.5MPa or 52.2MPa, and the specific surface area of the cement is not less than 400 square meters per kg.
Further, the slag micro powder is S105-grade mineral waste residue subjected to high-temperature calcination, the specific surface area of the slag micro powder is more than or equal to 500 square meters per kilogram, and the 7d activity index of the slag micro powder is not less than 95%.
Furthermore, the desulfurized gypsum is an industrial byproduct discharged from a thermal power plant, the content of calcium sulfate dihydrate in the desulfurized gypsum is not less than 95%, and the specific surface area of the desulfurized gypsum is not less than 400m 2/kg.
Furthermore, the fly ash is I-grade fly ash, and the content of calcium oxide in the fly ash is more than 10%; the silica fume is a byproduct of industrial smelting fume, and the content of silicon dioxide in the silica fume is more than 85%.
Further, the residue of the sodium bentonite after being screened by a 75-micron sieve hole is not more than 2%, and the content of montmorillonite minerals in the sodium bentonite is not less than 80%.
Further, the modulus of the sodium silicate powder is between 1 and 2; the expanding agent is calcium sulphoaluminate expanding agent.
Further, the preparation steps of the stabilized soil are as follows:
1) selecting loose soil to sieve on a construction site, wherein the sieved soil forms soil powder, and the particle size of the maximum particles of the soil powder is not more than 5 mm;
2) sequentially adding water and stabilizing powder in a stirring barrel in proportion, wherein the weight of the stabilizing powder is 15-25% of the weight of the soil powder added subsequently, and the weight of the water is 2-3 times of the weight of the soil powder added subsequently; and vibrating and stirring the mixture of the water body and the stabilizing powder for more than 5 minutes, then adding the soil powder in batches, wherein the volume of the soil powder added each time is not more than 1/5 of the volume of the stirring barrel, and continuously vibrating and stirring the mixture of the soil powder, the water body and the stabilizing powder for more than 20 minutes to form the stabilizing soil with a superfluid state and a flow expansion degree of more than 600 mm.
Further, a vibration seat is arranged at the bottom of the stirring barrel and drives the stirring barrel to vibrate up and down; the stirring device comprises a stirring barrel, a stirring shaft, a stirring blade support and a stirring blade, wherein the stirring barrel is internally provided with a stirring cavity for accommodating water, soil powder and stable powder;
the stirring shaft is movably connected with two pressure plates, when the stirring shaft rotates, the pressure plates rotate and move up and down relative to the stirring shaft, the stirring shaft movably penetrates through the middle parts of the pressure plates, a pressing space is formed by enclosing the two pressure plates, and the stirring blades are positioned in the middle part of the pressing space; the pressing plate is provided with a clamping surface facing the pressing space, and a tip-shaped striking block is arranged on the clamping surface facing the pressing space;
annular intervals are formed between the periphery of the pressure plate and the inner side wall of the stirring cavity respectively, a plurality of hollow areas are formed in the pressure plate, and the hollow areas penetrate through the pressure plate up and down; the bottom of the pressure plate below the stirring blade is connected with the bottom of the stirring cavity through a lower spring, and the top of the pressure plate above the stirring blade is connected with the top of the stirring cavity through an upper spring.
Further, a flat penetrating opening is formed in the stirring blade, the penetrating opening is arranged in a flat extending mode along the radial direction of the stirring shaft, and the height of the penetrating opening is smaller than 4 mm; the stirring blade is provided with a deviating surface deviating from the rotation direction of the stirring shaft, a plurality of elastic pieces are convexly arranged on the deviating surface, the elastic pieces are circumferentially arranged at intervals along the circumferential direction of the penetrating opening, a crack is formed between every two adjacent elastic pieces, and the width of the crack is smaller than 4 mm;
the inner end of the elastic sheet is butted with the peripheral edge of the through opening, and the outer end of the elastic sheet is obliquely arranged away from the through opening along the direction deviating from the surface; the elastic sheet is provided with a striking side wall facing the through opening, and a plurality of pointed protrusions are convexly arranged on the striking side wall.
Compared with the prior art, the low-permeability fluid-state stable soil construction method for water leakage treatment of the prestressed pipe pile provided by the invention has the advantages that firstly, bottom sealing concrete is poured into the pipe pile group to seal the bottom of the pipe pile group, and then the low-permeability fluid-state stable soil prepared from the stabilizing powder, water and soil is used; in addition, the stabilizing powder is mixed with soil to form stabilizing soil, and the stabilizing soil is used for pouring and filling a pipe pile group with leakage under the condition of less mixing amount, still has higher impermeability and strength, simultaneously has micro expansibility and good seepage prevention function, and has the following advantages compared with the existing expanded cement mortar or expanded concrete for pipe pile seepage prevention:
firstly, the cost of the stabilizing powder is low, and the stabilizing powder is prepared by mixing a small part of cement clinker with a large part of slag micropowder, desulfurized gypsum, fly ash and other industrial byproducts, so that the material cost is low.
The cost of the stabilized soil is low, the existing tubular pile seepage-proofing is completely poured with expansive cement or expansive concrete in the pile core, and the most of the materials except the stabilizing powder are fine-grained soil after being screened on a construction site, so the cost of the fluid state stabilized soil is low.
And thirdly, the fluidity is good, and the stable powder contains fine granular substances such as silica fume, desulfurized gypsum, fly ash and the like, so that the fluidity of the fluid stable soil is good, the effect similar to super-fluid and high-fluidity mortar is achieved, and the pile core is very easy to be irrigated through the irrigation guide pipe in the center of the tubular pile.
And fourthly, the permeability coefficient is low, the impermeability is good, the stable powder contains fine particulate matters such as silica fume, desulfurized gypsum, fly ash and the like, and the swelling and water absorption effects of bentonite are added, so that the stable fluid state soil has good impermeability, and through detection, the permeability coefficient of the solidified fluid state stable soil can reach the magnitude order of 10-7cm/s, and the fluid state stable soil has good impermeability.
Fifthly, the expansibility is good, the stabilizing powder contains calcium sulphoaluminate expanding agent, the fluid state stabilizing soil after the pile core of the pipe pile is poured has no shrinkage and has micro expansibility, and the anti-permeability function of the pipe pile is further improved.
Drawings
FIG. 1 is a schematic structural diagram of a mixing tank for preparing stabilized soil provided by the invention;
FIG. 2 is a schematic top view of the mixing tank according to the present invention;
FIG. 3 is a sectional view of the stirring blade and the elastic sheet provided by the present invention;
fig. 4 is a sectional structure diagram of the elastic sheet provided by the present invention.
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 description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, 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 patent, and it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to the specific situation.
Referring to fig. 1-4, preferred embodiments of the present invention are shown.
A low-permeability flow state stable soil construction method for water leakage treatment of a prestressed pipe pile is characterized in that a filling guide pipe is arranged inside a pipe pile group with a set depth driven into a soil layer, the top of the filling guide pipe is connected with a filling hopper, a bottom sealing concrete layer is filled into the pipe pile group through the filling hopper and the filling guide pipe, the bottom sealing concrete layer is formed at the lower part of the pipe pile group, and the bottom of the pipe pile group is sealed;
pouring superfluid stabilized soil into the tubular pile group through the pouring hopper and the pouring guide pipe to form a stabilized soil layer on the bottom sealing concrete layer; the tubular pile group comprises a plurality of tubular piles which are butted up and down in sequence, annular butt joint steel plates are arranged at the end parts of the tubular piles, and adjacent tubular piles are butted through the butt joint steel plates at the end parts;
the stabilizing soil comprises the following stabilizing powder in parts by weight: 10-15 parts of cement, 40-60 parts of slag micro powder, 10-20 parts of desulfurized gypsum, 15-25 parts of fly ash, 5-10 parts of silica fume, 5-10 parts of sodium bentonite, 5-10 parts of sodium silicate and 2-6 parts of an expanding agent; the stabilizing powder is mixed with water and soil and then stirred to form super-fluidized stabilizing soil.
Thus, the bottom sealing concrete is poured into the pipe pile group to seal the bottom of the pipe pile group, and then the low-permeability flow state stable soil prepared from the stabilizing powder, the water body and the soil is used, as the soil can be directly obtained at the construction site, the water body can be directly tap water, and each component of the stabilizing powder is a common market commodity, is cheap and easy to obtain, so the manufacturing cost is low; in addition, the stabilizing powder is mixed with soil to form stabilizing soil, and the stabilizing soil is used for pouring and filling a pipe pile group with leakage under the condition of less mixing amount, still has higher impermeability and strength, simultaneously has micro expansibility and good seepage prevention function, and has the following advantages compared with the existing expanded cement mortar or expanded concrete for pipe pile seepage prevention:
firstly, the cost of the stabilizing powder is low, and the stabilizing powder is prepared by mixing a small part of cement clinker with a large part of slag micropowder, desulfurized gypsum, fly ash and other industrial byproducts, so that the material cost is low.
The cost of the stabilized soil is low, the existing tubular pile seepage-proofing is completely poured with expansive cement or expansive concrete in the pile core, and the most of the materials except the stabilizing powder are fine-grained soil after being screened on a construction site, so the cost of the fluid state stabilized soil is low.
And thirdly, the fluidity is good, and the stable powder contains fine granular substances such as silica fume, desulfurized gypsum, fly ash and the like, so that the fluidity of the fluid stable soil is good, the effect similar to super-fluid and high-fluidity mortar is achieved, and the pile core is very easy to be irrigated through the irrigation guide pipe in the center of the tubular pile.
And fourthly, the permeability coefficient is low, the impermeability is good, the stable powder contains fine particulate matters such as silica fume, desulfurized gypsum, fly ash and the like, and the swelling and water absorption effects of bentonite are added, so that the stable fluid state soil has good impermeability, and through detection, the permeability coefficient of the solidified fluid state stable soil can reach the magnitude order of 10-7cm/s, and the fluid state stable soil has good impermeability.
Fifthly, the expansibility is good, the stabilizing powder contains calcium sulphoaluminate expanding agent, the fluid state stabilizing soil after the pile core of the pipe pile is poured has no shrinkage and has micro expansibility, and the anti-permeability function of the pipe pile is further improved.
The cement is Portland cement with the strength of 42.5MPa or 52.2MPa, and the specific surface area of the cement is not less than 400 square meters per kg.
The cement belongs to a hydraulic cementing material, and after meeting water, minerals in the cement, including tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite, react with water in water to respectively generate hydrated calcium silicate gel, hydrated calcium aluminate gel and hydrated calcium ferrite gel.
In addition, partial calcium oxide in the cement provides a proper alkaline environment, the decomposition and dissociation of alumina (Al2O3) and silicon dioxide (SiO2) in the slag micro powder are promoted, the separated aluminum ions and silicon ions react with calcium hydroxide (Ca (OH)2) to further generate calcium silicate hydrate, and the solidified compounds form a framework to fill the pores of the soil body.
The slag micro powder is S105-grade mineral waste residue subjected to high-temperature calcination, the specific surface area of the slag micro powder is more than or equal to 500 square meters per kilogram, and the 7d activity index of the slag micro powder is not less than 95%.
The slag micro powder is waste residue after high-temperature calcination, and the slag micro powder generally has no activity, but has activity in an alkaline environment. After the cement and the fly ash are added, the calcium oxide in the cement and the fly ash promotes the mineral decomposition in the slag micro powder, silicon ions and aluminum ions are decomposed from silicon dioxide (SiO2) and aluminum oxide (Al2O3), and calcium silicate hydrate and calcium aluminate hydrate gel are generated with calcium hydroxide (Ca (OH)2) in the solution.
Further, alumina (Al2O3) and calcium oxide in the fine slag powder and sulfate ions in gypsum form ettringite, and these colloids or crystals eventually gradually harden to become brittle hardened bodies.
The desulfurized gypsum is an industrial byproduct discharged by a thermal power plant, the content of calcium sulfate dihydrate in the desulfurized gypsum is more than or equal to 95 percent, and the specific surface area of the desulfurized gypsum is more than or equal to 400m 2/kg; the aluminum ions, the calcium ions and sulfate ions in the desulfurized gypsum generate ettringite crystals, so that the fluidity of the fluid stable soil is better.
The fly ash is I-grade fly ash, and the content of calcium oxide in the fly ash is more than 10 percent; the silica fume is a byproduct of industrial smelting fume, and the content of silicon dioxide in the silica fume is more than 85 percent.
As the fly ash contains a large amount of active oxides such as SiO2, Al2O3, Fe2O3 and the like, on one hand, the oxides are decomposed into silicon ions, aluminum ions and iron ions under the alkaline environment, and the silicon ions, the aluminum ions and the iron ions and calcium ions in the slag micro-powder generate calcium silicate hydrate gel, calcium ferrite hydrate gel and calcium aluminate hydrate gel. In addition, partial aluminum ions and calcium ions of the fly ash and sulfate ions in the desulfurized gypsum generate ettringite crystals; on the other hand, the fly ash has fine particles, has good filling effect on the pores of various minerals in the stable powder, and can further improve the impermeability.
The screen residue of sodium bentonite after being screened by a 75-micron screen hole is not more than 2 percent, and the content of montmorillonite mineral in the sodium bentonite is not less than 80 percent.
The sodium bentonite mainly comprises montmorillonite minerals, wherein the particle shape of the montmorillonite minerals is sheet, the length of the montmorillonite minerals is 1/100 of cement particles, the thickness of the montmorillonite minerals is 1,5000 of the cement particles, the montmorillonite minerals expand 30 times after meeting water, silicon ions and aluminum ions are decomposed in an alkaline environment to generate calcium silicate hydrate and calcium aluminate hydrate gel together with calcium hydroxide (Ca (OH)2), and partial aluminum ions, sulfate ions and calcium hydroxide (Ca (OH)2) generate ettringite crystals. After the gel or the crystal is hardened, the strength of the stabilized soil is improved, gaps among minerals are filled, and the gel or the crystal has better anti-permeability performance.
The modulus of the sodium silicate powder is between 1 and 2, the sodium silicate is easy to react with calcium hydroxide (Ca (OH)2) in solution or soil, the reaction is divided into two stages, and the first stage reacts with calcium ions in slag micro powder, fly ash or cement to generate calcium silicate hydrate; the second stage reacts with calcium hydroxide (Ca (OH)2) in the soil again to generate calcium silicate hydrate gel, and hardened gel particles are filled in soil pores, so that the strength and the impermeability of the soil are improved.
The expanding agent is calcium sulphoaluminate expanding agent, the expanding agent has better compatibility with slag micro powder, cement and the like, active alumina (Al2O3) in the expanding agent reacts with tricalcium silicate, dicalcium silicate and hydration products Ca (OH)2 in cement clinker to generate hydrated tricalcium aluminate, the hydrated tricalcium aluminate reacts with gypsum to generate needle-shaped hydrated tricalcium sulphoaluminate (ettringite) containing a large amount of crystal water under the condition of the presence of the gypsum, and the hydrated tricalcium aluminate gel and the ettringite are hardened to further fill pores.
The preparation steps of the stabilized soil are as follows:
1) selecting loose soil to sieve on a construction site, wherein the sieved soil forms soil powder, and the particle size of the maximum particles of the soil powder is not more than 5 mm; the selected soil is required to have not too high water content, and is preferably easy to knead into powder, so that the superfluid performance and better fluidity of the soil are ensured.
2) Sequentially adding water and stabilizing powder in proportion into the stirring barrel 100, wherein the weight of the stabilizing powder is 15-25% of the weight of the soil powder to be added subsequently, and the weight of the water is 2-3 times of the weight of the soil powder to be added subsequently; vibrating and stirring the mixture of the water body and the stabilizing powder for more than 5 minutes, then adding the soil powder in batches, wherein the volume of the soil powder added each time is not more than 1/5 of the volume of 100 of the stirring barrel, and continuously vibrating and stirring the mixture of the soil powder, the water body and the stabilizing powder for more than 20 minutes to form the stabilizing soil which is in a super-flow state and has the flow expansion degree of more than 600 mm; the stabilized soil has good superfluid performance and fluidity.
The chemical reaction in the stabilized soil is divided into two stages, wherein the first stage is that various minerals in the stabilizing powder react with each other to generate hydrated calcium silicate gel, hydrated calcium aluminate gel and hydrated calcium ferrite gel, as well as ettringite crystal and calcium hydroxide (Ca (OH) 2); in the second stage, the minerals in the soil are decomposed in an alkaline environment to form silicon ions and aluminum ions, calcium hydroxide (Ca (OH)2) and sulfate ions are used for generating hydrated calcium silicate and ettringite crystals, and the hydrated calcium silicate and ettringite crystals are further filled in pores after being condensed, so that the impermeability and strength of the stabilized soil are increased.
The bottom of the stirring barrel 100 is provided with a vibration seat 200, and the vibration seat 200 drives the stirring barrel 100 to vibrate up and down; a stirring cavity for containing water, soil powder and stabilizing powder is arranged in the stirring barrel 100, a stirring shaft 300 which is longitudinally arranged is arranged in the stirring cavity, a plurality of stirring blades 301 are connected to the stirring shaft 300, the stirring blades 301 are arranged at intervals along the circumferential direction of the stirring shaft 300, and the stirring blades 301 are arranged in an inclined manner along the circumferential direction of the stirring shaft 300;
two pressure plates 400 are movably connected to the stirring shaft 300, when the stirring shaft 300 rotates, the pressure plates 400 rotate and move up and down relative to the stirring shaft 300, the stirring shaft 300 movably penetrates through the middle parts of the pressure plates 400, a pressing space is formed by enclosing the two pressure plates 400, and the stirring blades 301 are positioned in the middle parts of the pressing space; the platen 400 has a holding surface facing the pressing space, and a tip-shaped striking block 404 is provided on the holding surface facing the pressing space;
Like this, to stabilize the powder, the stirring intracavity of agitator 100 is added to water and soil in proportion, along with the vibration of agitator 100 and the rotation of (mixing) shaft 300, stabilize the powder, water and soil constantly mix the stirring, because pressure disk 400 and (mixing) shaft 300 swing joint, the rotation of (mixing) shaft 300 drives the rotation of pressure disk 400 and reciprocates, when the material in the stirring chamber bucket is raised upward, pressure disk 400 above stirring vane 301 can stop it and spill over outside agitator 100, and two upper and lower pressure disk 400 reciprocate, make thick material and the striking piece 404 on the clamping face take place the striking and smash, make the granule of the material in the agitator 100 littleer, the mobility is higher, more help the stirring.
The platen 400 is provided with a hollow area 406, and an annular space 405 is formed between the platen 400 and the stirring barrel 100, so that materials can be added through the hollow area 406 and the annular space 405 according to needs in a stirring diagram.
The stirring blade 301 is provided with a flat through hole 310 through which small-particle materials in the stirring barrel 100 can pass, the through hole 310 is arranged along the radial direction of the stirring shaft 300 in a flat extending manner, the height of the through hole 310 is less than 4mm, and soil with the particle size of less than 4mm can pass through; stirring vane 301 has the surface that deviates from of the rotation direction of (mixing) shaft 300, deviates from the surface epirelief and is equipped with a plurality of flexure strips 311, and a plurality of flexure strips 311 encircle along the circumference interval of passing mouth 310 and arrange, are formed with the crack between the adjacent flexure strip 311, and the width of crack is less than 4mm, can let the soil that is less than 4mm particle diameter pass through equally, and the granule that will be greater than 4mm blocks outside, makes its further striking breakage attenuate.
The inner end of the elastic piece 311 is butted against the peripheral edge of the through opening 310, and the outer end of the elastic piece 311 is obliquely arranged away from the through opening 310 along the direction away from the surface; the elastic sheet 311 is provided with a striking side wall 312 facing the through opening 310, and a plurality of point-shaped protrusions 313 are convexly arranged on the striking side wall 312; along with stirring vane 301's continuous quick rotation, constantly collide with flexure strip 311 for the granule that is greater than 4mm in the agitator 100, make the large granule breakage diminish, the striking lateral wall 312 epirelief of flexure strip 311 is equipped with most advanced form protruding 313, has increased the striking area of granule with flexure strip 311, has improved impact strength for the large granule material is changeed smashes, improves the mobility of stirring efficiency and stabilized soil.
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 construction method is characterized in that a filling guide pipe is arranged inside a pipe pile group with a set depth in a driven soil layer, the top of the filling guide pipe is connected with a filling hopper, a bottom sealing concrete layer is filled into the pipe pile group through the filling hopper and the filling guide pipe, the bottom sealing concrete layer is formed at the lower part of the pipe pile group, and the bottom of the pipe pile group is sealed;
pouring superfluid stabilized soil into the tubular pile group through the pouring hopper and the pouring guide pipe to form a stabilized soil layer on the bottom sealing concrete layer; the tubular pile group comprises a plurality of tubular piles which are butted up and down in sequence, annular butt joint steel plates are arranged at the end parts of the tubular piles, and adjacent tubular piles are butted through the butt joint steel plates at the end parts;
the stabilized soil comprises the following stabilized powders in percentage by weight: 10-15 parts of cement, 40-60 parts of slag micro powder, 10-20 parts of desulfurized gypsum, 15-25 parts of fly ash, 5-10 parts of silica fume, 5-10 parts of sodium bentonite, 5-10 parts of sodium silicate and 2-6 parts of an expanding agent; and the stabilizing powder is mixed with water and soil and then stirred to form super-fluidized stabilizing soil.
2. The construction method of low-permeability fluid-state stable soil for the water leakage treatment of the prestressed pipe pile of claim 1, wherein the cement is portland cement with the strength of 42.5MPa or 52.2MPa, and the specific surface area of the cement is not less than 400 square meters per kg.
3. The construction method of the low-permeability flow-state stabilized soil for the water leakage treatment of the prestressed pipe pile as claimed in claim 1, wherein the slag micro powder is S105-grade high-temperature calcined mineral waste residue, the specific surface area of the slag micro powder is not less than 500 square meters per kg, and the 7d activity index of the slag micro powder is not less than 95%.
4. The construction method of the low-permeability fluid-state stabilized soil for the leakage water treatment of the prestressed pipe pile as claimed in claim 1, wherein the desulfurized gypsum is an industrial byproduct discharged from a thermal power plant, the content of calcium sulfate dihydrate in the desulfurized gypsum is not less than 95%, and the specific surface area of the desulfurized gypsum is not less than 400m 2/kg.
5. The construction method of the low-permeability fluid-state stabilized soil for the water leakage treatment of the prestressed pipe pile of claim 1, wherein the fly ash is I-grade fly ash, and the content of calcium oxide in the fly ash is more than 10%; the silica fume is a byproduct of industrial smelting fume, and the content of silicon dioxide in the silica fume is more than 85%.
6. The method for constructing low-permeability fluid-state stabilized soil for water seepage treatment of prestressed pipe piles as claimed in claim 1, wherein the sodium bentonite has a screen residue of not more than 2% after being screened out through a 75 μm screen hole, and the sodium bentonite has a smectite mineral content of not less than 80%.
7. The construction method of the low-permeability fluid-state stabilized soil for the water leakage treatment of the prestressed pipe pile of claim 1, wherein the modulus of the sodium silicate powder is between 1 and 2; the expanding agent is calcium sulphoaluminate expanding agent.
8. The construction method of low-permeability fluid-state stabilized soil for water seepage treatment of prestressed pipe piles as claimed in any one of claims 1 to 7, wherein the stabilized soil is prepared by the following steps:
1) selecting loose soil to sieve on a construction site, wherein the sieved soil forms soil powder, and the particle size of the maximum particles of the soil powder is not more than 5 mm;
2) sequentially adding water and stabilizing powder in a stirring barrel in proportion, wherein the weight of the stabilizing powder is 15-25% of the weight of the soil powder added subsequently, and the weight of the water is 2-3 times of the weight of the soil powder added subsequently; and vibrating and stirring the mixture of the water body and the stabilizing powder for more than 5 minutes, then adding the soil powder in batches, wherein the volume of the soil powder added each time is not more than 1/5 of the volume of the stirring barrel, and continuously vibrating and stirring the mixture of the soil powder, the water body and the stabilizing powder for more than 20 minutes to form the stabilizing soil with super-flow state and the flow expansion degree of more than 600 mm.
9. The construction method of low-permeability fluid-state stabilized soil for water leakage treatment of prestressed pipe piles according to claim 8, wherein a vibrating seat is arranged at the bottom of the stirring barrel, and the vibrating seat drives the stirring barrel to vibrate up and down; the stirring device comprises a stirring barrel, a stirring shaft, a plurality of stirring blades and a stirring device, wherein the stirring barrel is internally provided with a stirring cavity for accommodating water, soil powder and stabilizing powder, the stirring cavity is internally provided with the stirring shaft which is longitudinally arranged, the stirring shaft is connected with the plurality of stirring blades, the plurality of stirring blades are arranged at intervals along the circumferential direction of the stirring shaft, and the stirring blades are arranged in an inclined manner along the circumferential direction of the stirring shaft;
the stirring shaft is movably connected with two pressure plates, when the stirring shaft rotates, the pressure plates rotate and move up and down relative to the stirring shaft, the stirring shaft movably penetrates through the middle parts of the pressure plates, a pressing space is formed by enclosing the two pressure plates, and the stirring blades are positioned in the middle part of the pressing space; the pressing plate is provided with a clamping surface facing the pressing space, and a tip-shaped striking block is arranged on the clamping surface facing the pressing space;
annular intervals are formed between the periphery of the pressure plate and the inner side wall of the stirring cavity respectively, a plurality of hollow areas are formed in the pressure plate, and the hollow areas penetrate through the pressure plate up and down; the bottom of the pressure plate below the stirring blade is connected with the bottom of the stirring cavity through a lower spring, and the top of the pressure plate above the stirring blade is connected with the top of the stirring cavity through an upper spring.
10. The construction method of low-permeability fluid-state stabilized soil for water seepage treatment of prestressed pipe piles as claimed in claim 9, wherein the stirring blades are provided therein with flat through openings which are arranged in a flat manner along the radial direction of the stirring shaft and have a height of less than 4 mm; the stirring blade is provided with a deviating surface deviating from the rotation direction of the stirring shaft, a plurality of elastic pieces are convexly arranged on the deviating surface, the elastic pieces are circumferentially arranged at intervals along the circumferential direction of the penetrating opening, a crack is formed between every two adjacent elastic pieces, and the width of the crack is smaller than 4 mm;
the inner end of the elastic sheet is butted with the peripheral edge of the through opening, and the outer end of the elastic sheet is obliquely arranged away from the through opening along the direction deviating from the surface; the elastic sheet is provided with a striking side wall facing the through opening, and a plurality of pointed protrusions are convexly arranged on the striking side wall.
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