CN113006376B - Supporting steel pipe column for deep foundation pit reverse construction method and machining process thereof - Google Patents
Supporting steel pipe column for deep foundation pit reverse construction method and machining process thereof Download PDFInfo
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- CN113006376B CN113006376B CN202110200974.4A CN202110200974A CN113006376B CN 113006376 B CN113006376 B CN 113006376B CN 202110200974 A CN202110200974 A CN 202110200974A CN 113006376 B CN113006376 B CN 113006376B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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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
Abstract
The invention discloses a supporting steel pipe column for a deep foundation pit reverse construction method and a processing technology thereof. Comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises the following raw material components of cement, fly ash, mineral powder, bentonite, an expanding agent, a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sand and a carboxylic acid water reducing agent. The polymer monomer contained in the polymer solution can be complexed by the hydroxyl cucurbit uril @ composite ceramic, and then is modified on the hydroxyl cucurbit uril @ composite ceramic, and is polymerized under the synergistic action of a magnetic field and a high-energy electron beam, so that a polymer network is formed in the concrete slurry, the bonding degree of the concrete slurry is greatly improved, pores and brittle fracture between the concrete slurry and a steel pipe are avoided, the supporting effect of the supporting steel pipe is optimized, the stability in the concrete slurry is maintained, and the layering phenomenon is avoided.
Description
Technical Field
The invention relates to the technical field of supporting steel pipes, in particular to a supporting steel pipe column for a deep foundation pit reverse construction method and a processing technology thereof.
Background
With the rapid rise of economy in China, the large-scale construction of various factories and houses makes the land resource situation in China increasingly tense. In order to relieve the pressure of land resources, the construction of a high-rise and ultra-high-rise basement reverse construction method is bound to become a trend in the future. The support steel pipe plays an important role in the construction of basement buildings as a reverse permanent support structural column technology.
At present, the supporting strength of the supporting steel pipe on the market is insufficient, the bonding strength between concrete slurry in the steel pipe and the pipe wall of the steel pipe is poor, and the concrete slurry is easy to layer.
Therefore, there is a need for a supporting steel pipe column for a deep foundation pit reverse construction method and a processing technique thereof to solve the problems suggested in the background.
Disclosure of Invention
The invention aims to provide a supporting steel pipe column for a deep foundation pit reverse construction method and a processing technology thereof, and aims to solve the problems in the background technology.
A supporting steel pipe column for a deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises, by weight, 400 parts of cement 300-doped materials, 90-110 parts of fly ash, 45-55 parts of mineral powder, 95-115 parts of bentonite, 30-40 parts of an expanding agent, 15-20 parts of a polymer mixed solution, 300 parts of hydroxyl melon ring @ composite ceramic 200-doped materials, 350 parts of sand 250-doped materials and 15-20 parts of a carboxylic acid water reducing agent.
Further, the polymer mixed solution comprises the following raw material components: 15 to 30 parts of hydrochloric acid, 1 to 5 parts of acetone, 4-butoxy-2, - (4-methacryloyloxybutoxy) -4, - (butoxybenzoyloxy) benzoate 20 to 30 parts, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoyloxy) benzoate 30 to 40 parts, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoyloxy) benzoate 15 to 25 parts by weight.
Furthermore, the hydroxyl cucurbituril @ composite ceramic comprises the following raw material components: 25-35 parts of superfine calcium carbonate, 20-30 parts of superfine ferroferric oxide, 10-20 parts of superfine titanium dioxide, 30-35 parts of porous alumina, 30-50 parts of a silane coupling agent and 60-70 parts of hydroxyl cucurbituril.
Further, the silane coupling agent is one or more of an aminosilane coupling agent, an epoxy silane coupling agent and a hydroxyl silane coupling agent.
Further, the particle size of the porous alumina is 1-10 μm.
A processing technology of a supporting steel pipe column of a deep foundation pit reverse construction method comprises the following steps:
(1) preparing superfine calcium carbonate, superfine ferroferric oxide and titanium dioxide, adding ethanol and porous alumina, and performing ball milling to obtain a material A;
(2) pressing and molding the material A, placing the material A in a muffle furnace, heating, taking out, cooling, adding absolute ethyl alcohol, and stirring to obtain ceramic particles;
(3) placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation, performing rotary evaporation to remove a solvent, adding deionized water and hydroxyl cucurbituril, and stirring to obtain hydroxyl cucurbituril @ composite ceramic;
(4) uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding a hydrochloric acid solution, dropwise adding acetone, filtering, drying, adding water, and stirring for dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, and stirring to obtain concrete slurry;
(6) the method comprises the steps of arranging a hopper at the opening of a fixedly-installed steel pipe, adding concrete slurry into the hopper from the upper part of the hopper, carrying out high-energy ionizing radiation on the concrete in the downward falling process of the concrete slurry, removing the hopper after pouring is finished, chiseling out floating slurry, and sealing and protecting the steel pipe column to obtain the supporting steel pipe column.
The method specifically comprises the following steps:
(1) mixing superfine calcium carbonate, superfine ferroferric oxide and superfine titanium dioxide, adding ethanol, ball-milling for 2-3h at the rotation speed of 600-; by means of ball milling, the superfine ferroferric oxide, the superfine calcium carbonate and the superfine titanium dioxide can be extruded into pores of the porous alumina, and lattice defects are formed between the porous ferroferric oxide, the superfine calcium carbonate and the porous titanium dioxide and the porous alumina, so that atomic-level mixing is achieved.
(2) Pressing and molding the material A under the pressure condition of 120-plus-150 MPa, placing the material A in a muffle furnace, firstly heating at medium temperature for a period of time, preserving heat for 0.5-1h, then heating at high temperature for a period of time, preserving heat for 3-5h, taking out, cooling, adding absolute ethyl alcohol, stirring and reacting for 1-5h under the rotation speed condition of 600-plus-1000 r/min, and obtaining ceramic particles; the medium-temperature heating temperature is 600-800 ℃; the high-temperature heating temperature is 800-1200 ℃; through high-temperature calcination, the superfine calcium carbonate, the superfine titanium dioxide and the alumina react to form calcium hexaluminate with high refractory effect in the porous alumina. The formation of calcium hexaluminate can greatly improve the heat preservation and insulation effect and the fireproof effect of the steel pipe, and can effectively prevent the shrinkage and cracking of concrete in the steel pipe caused by the fire of a basement.
(3) Placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation for 2-3h at the frequency of 30-38kHz, removing the solvent by rotary evaporation, adding deionized water, stirring, adding hydroxyl cucurbituril, raising the temperature to 35-45 ℃, and stirring for reaction for 30-50min to obtain hydroxyl cucurbituril @ composite ceramic;
the ceramic particles are further treated by using a silane coupling agent, and silicon hydroxyl contained in the silane coupling agent can be chemically bonded with hydroxyl on the ceramic particles so as to be modified on the surfaces of the ceramic particles; the silane coupling agent used in the application can react with hydroxyl, carboxyl or oxygen-containing groups and other active functional groups in concrete slurry, so that the interface binding force between the hydroxyl cucurbituril @ composite ceramic and the concrete slurry is improved, the mechanical property of the support steel pipe is improved, active sites can be provided for modification of the hydroxyl cucurbituril on ceramic particles, and the premise is provided for the subsequent reaction between the hydroxyl cucurbituril @ composite ceramic.
The hydroxyl cucurbituril belongs to a molecular container, can have a strong bonding effect on various metal ions, metal complexes and organic molecules, has a hydrophobic cavity, can have a certain complexing effect on a molecular chain containing a benzene ring structure, and has certain complexing effect on metal ions due to the fact that carbonyl oxygen atoms are distributed at ports at two ends of the hydroxyl cucurbituril. The hydroxyl at the waist of the hydroxyl cucurbituril is reacted with active groups such as hydroxyl, amino and the like on the ceramic particles, and then the hydroxyl cucurbituril is modified on the ceramic particles to obtain the hydroxyl cucurbituril @ composite ceramic; in the present invention, in the benzene component 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate contained in the molecular chain, one end of the molecular chain is complexed in the cavity of the hydroxycouch, and the other end can be spread outward, thereby obtaining the hydroxycouch @ composite ceramic having the polymer monomer molecular chain supported on the surface.
(4) Uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding 10-15% by mass of hydrochloric acid solution, dropwise adding acetone, stirring for reaction for 30-40min, filtering, adding water into the dried powder, and stirring for dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, stirring and reacting for 0.5-3h at the constant temperature of 45-65 ℃, and standing for 3-10min to obtain concrete slurry;
(6) and arranging a hopper at the mouth of the fixedly installed steel pipe, adding concrete slurry into the hopper from a position 2-6m above the hopper, performing high-energy ionizing radiation on the concrete in the process of downward falling of the concrete slurry, removing the hopper after pouring is finished, chiseling out the floating slurry, and sealing and protecting the steel pipe column to obtain the supporting steel pipe column.
According to the invention, the hydroxyl cucurbituril @ composite ceramic, the polymer mixed solution and the components such as cement, fly ash, mineral powder, bentonite and an expanding agent are mixed, and the hydroxyl cucurbituril @ composite ceramic and the polymer mixed solution react at a constant temperature of 45-65, so that a polymer monomer can be complexed to the hydroxyl cucurbituril @ composite ceramic, and the viscosity of the concrete slurry in the process is low, thereby being very beneficial to stirring and transportation. This application still used the electron beam to carry out the irradiation when adding the concrete thick liquids to the steel pipe, under the dual function of magnetic field and high energy electron beam irradiation, the polymer mixed liquid in the concrete thick liquids takes place the cross-linking fast to progressively form stable polymer network structure, at this in-process, the viscosity of concrete thick liquids will greatly increased. The increase of the viscosity of the concrete slurry greatly enhances the binding force between the concrete slurry and the inner wall of the steel pipe, and can greatly improve the problem that the supporting capacity of the steel pipe is reduced because the steel pipe is separated from the concrete slurry in the subsequent use process of the supporting steel pipe. After the polymer mixed solution is polymerized, the produced high molecular polymer has excellent viscosity and excellent elasticity, and the problem that concrete is subjected to brittle fracture under the action of pressure can be solved.
Further, the step (5) needs to be performed under a magnetic field condition. The magnetic field condition can be used for mechanically orienting the hydroxyl cucurbituril @ composite ceramic in the concrete slurry, so that the distribution of the hydroxyl cucurbituril @ composite ceramic in the concrete slurry is changed from disorder to order, the dispersion stress of the steel pipe is further improved, the mechanical property of the steel pipe is enhanced, the service life of the steel pipe is prolonged, and reaction conditions are provided for further polymerization of the polymer mixed liquor, the hydroxyl cucurbituril @ composite ceramic and the polymer mixed liquor.
Further, the high-energy ionizing radiation mode is electron beam radiation, and the high-energy ionizing radiation dose is 38-48 kGy.
Further, the medium-temperature heating temperature is 600-; the high-temperature heating temperature is 800-1200 ℃, and the high-temperature heating time is 4-6 h.
Compared with the prior art, the invention has the following beneficial effects:
the hydroxyl cucurbituril @ composite ceramic has excellent fire resistance and heat insulation effect, and can avoid the problems of cracking, reduction of mechanical property, short service life and the like of a supporting steel pipe in a fire environment; the hydroxyl cucurbituril @ composite ceramic has certain induction on a magnetic field, and can be oriented in the magnetic field environment, so that the arrangement of the hydroxyl cucurbituril @ composite ceramic in concrete slurry is changed from disorder to order, and the mechanical property of the support steel pipe is further enhanced; the hydroxyl cucurbituril @ composite ceramic has more active functional groups, can have better directional compatibility with concrete slurry, is uniformly and stably arranged in the concrete slurry, and is not easy to generate a layering phenomenon.
The polymer monomer contained in the polymer solution can be complexed by the hydroxyl cucurbituril @ composite ceramic, and then is modified on the hydroxyl cucurbituril @ composite ceramic, and is polymerized under the synergistic action of a magnetic field and a high-energy electron beam to form a polymer network in the concrete slurry, so that the bonding degree of the concrete slurry is greatly improved, pores and brittle fracture between the concrete slurry and a steel pipe are avoided, and the supporting effect of supporting the steel pipe is optimized. The modification of the polymer monomer on the hydroxyl cucurbituril @ composite ceramic also maintains the stability of filler components such as the hydroxyl cucurbituril @ composite ceramic, sand, bentonite and the like in concrete slurry, and avoids the layering phenomenon of concrete.
The concrete in the supporting steel pipe prepared by the invention has high self-compaction degree, excellent mechanical property, difficult brittle fracture, difficult interface separation with the wall material of the steel pipe, excellent comprehensive performance and strong supporting effect, and can completely realize the casting of underground buildings by a deep foundation pit reverse construction method. The preparation process of the supporting steel pipe is simple, the industrial production can be realized, and the supporting steel pipe has wide market application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Preparing superfine calcium carbonate, superfine ferroferric oxide and superfine titanium dioxide, adding ethanol, performing ball milling at the rotating speed of 600r/min for 2 hours, adding porous alumina, increasing the ball milling speed to 1000r/min, and continuously stirring for 3 hours to obtain a material A;
(2) pressing and molding the material A under the pressure condition of 120MPa, placing the material A in a muffle furnace, firstly heating at medium temperature for a period of time, preserving heat for 0.5h, then heating at high temperature for a period of time, preserving heat for 3h, taking out, cooling, adding absolute ethyl alcohol, and stirring and reacting for 1h at the rotating speed of 600r/min to obtain ceramic particles; the medium-temperature heating temperature is 600 ℃; the high-temperature heating temperature is 800 ℃;
(3) placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation for 2 hours at the frequency of 30kHz, performing rotary evaporation to remove a solvent, adding deionized water, stirring, adding hydroxyl cucurbituril, raising the temperature to 35 ℃, and performing stirring reaction for 30min to obtain hydroxyl cucurbituril @ composite ceramic;
(4) uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding a 10% hydrochloric acid solution by mass, dropwise adding acetone, stirring for reacting for 30min, filtering, adding water into the powder obtained after drying, and stirring and dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, stirring and reacting for 0.5h at a constant temperature of 45 ℃, and standing for 3min to obtain concrete slurry;
(6) the method comprises the steps of arranging a hopper at the opening of a fixedly-installed steel pipe, adding concrete slurry into the hopper from a position 2m above the hopper, carrying out high-energy ionizing radiation on the concrete in the downward falling process of the concrete slurry, removing the hopper after pouring is finished, chiseling out floating slurry, sealing and protecting the steel pipe column, and obtaining the supporting steel pipe column.
The step (5) needs to be carried out under the condition of a magnetic field.
The high-energy ionizing radiation mode is electron beam radiation, and the high-energy ionizing radiation dose is 38 kGy.
The medium-temperature heating temperature is 600 ℃, and the medium-temperature heating time is 0.5 h; the high-temperature heating temperature is 800 ℃, and the high-temperature heating time is 4 hours.
A supporting steel pipe column for a deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises the following raw material components, by weight, 300 parts of cement, 90 parts of fly ash, 45 parts of mineral powder, 95 parts of bentonite, 30 parts of an expanding agent, 15 parts of a polymer mixed solution, 200 parts of hydroxyl cucurbituril @ composite ceramic, 250 parts of sandstone and 15 parts of a carboxylic acid water reducing agent.
The polymer mixed solution comprises the following raw material components: 15 parts by weight of hydrochloric acid, 1 part by weight of acetone, 4-butoxy-2, - (4-methacryloyloxybutoxy) -4, - (butoxybenzoate) benzoate 20 parts by weight, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate 30 parts by weight, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate 15 parts by weight.
The hydroxyl cucurbituril @ composite ceramic comprises the following raw material components: the coating comprises, by weight, 25 parts of superfine calcium carbonate, 20 parts of superfine ferroferric oxide, 10 parts of superfine titanium dioxide, 30 parts of porous alumina, 30 parts of a silane coupling agent and 60 parts of hydroxyl cucurbituril. The particle size of the porous alumina is 1 μm.
The silane coupling agent is an aminosilane coupling agent.
Example 2
(1) Mixing superfine calcium carbonate, superfine ferroferric oxide and superfine titanium dioxide, adding ethanol, performing ball milling at the rotating speed of 700r/min for 2.5 hours, adding porous alumina, increasing the ball milling speed to 1200r/min, and continuously stirring for 3.5 hours to obtain a material A;
(2) pressing and molding the material A under the pressure condition of 130MPa, placing the material A in a muffle furnace, firstly heating at medium temperature for a period of time, preserving heat for 0.7h, then heating at high temperature for a period of time, preserving heat for 4h, taking out, cooling, adding absolute ethyl alcohol, stirring and reacting for 3h under the rotating speed condition of 800r/min to obtain ceramic particles; the medium-temperature heating temperature is 700 ℃; the high-temperature heating temperature is 1000 ℃;
(3) placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation for 2.5 hours at the frequency of 33kHz, removing the solvent by rotary evaporation, adding deionized water, stirring, adding hydroxyl cucurbituril, raising the temperature to 40 ℃, and performing stirring reaction for 40min to obtain hydroxyl cucurbituril @ composite ceramic;
(4) uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding 10-15% by mass of hydrochloric acid solution, dropwise adding acetone, stirring for reacting for 35min, filtering, and adding water into the powder obtained after drying and stirring for dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, stirring and reacting for 2 hours at the constant temperature of 55 ℃, and standing for 5 minutes to obtain concrete slurry;
(6) the method comprises the steps of arranging a hopper at the opening of a fixedly-installed steel pipe, adding concrete slurry into the hopper from a position 4m above the hopper, carrying out high-energy ionizing radiation on the concrete in the downward falling process of the concrete slurry, removing the hopper after pouring is finished, chiseling out floating slurry, sealing and protecting the steel pipe column, and obtaining the supporting steel pipe column.
The step (5) needs to be carried out under the condition of a magnetic field.
The high-energy ionizing radiation mode is electron beam radiation, and the high-energy ionizing radiation dose is 40 kGy.
The medium-temperature heating temperature is 700 ℃, and the medium-temperature heating time is 0.7 h; the high-temperature heating temperature is 1000 ℃, and the high-temperature heating time is 5 hours.
A supporting steel pipe column for a deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises, by weight, 350 parts of cement, 100 parts of fly ash, 50 parts of mineral powder, 100 parts of bentonite, 35 parts of an expanding agent, 18 parts of a polymer mixed solution, 250 parts of hydroxyl cucurbituril @ composite ceramic, 300 parts of sandstone and 18 parts of a carboxylic acid water reducing agent.
The polymer mixed solution comprises the following raw material components: 22 parts by weight of hydrochloric acid, 4 parts by weight of acetone, 4 parts by weight of 4-butoxy-2, - (4-methacryloyloxybutoxy) -4, - (butoxybenzoate) benzoate, 25 parts by weight of 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 35 parts by weight of 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate.
The hydroxyl cucurbituril @ composite ceramic comprises the following raw material components: 305 parts of superfine calcium carbonate, 25 parts of superfine ferroferric oxide, 15 parts of superfine titanium dioxide, 33 parts of porous alumina, 40 parts of a silane coupling agent and 65 parts of hydroxyl cucurbituril. The particle size of the porous alumina is 5 μm.
The silane coupling agent is an aminosilane coupling agent.
Example 3
(1) Preparing superfine calcium carbonate, superfine ferroferric oxide and superfine titanium dioxide, adding ethanol, performing ball milling at the rotating speed of 800r/min for 3 hours, adding porous alumina, increasing the ball milling speed to 1300r/min, and continuously stirring for 4 hours to obtain a material A;
(2) pressing and molding the material A under the pressure condition of 150MPa, placing the material A in a muffle furnace, firstly heating at medium temperature for a period of time, preserving heat for 1h, then heating at high temperature for a period of time, preserving heat for 5h, taking out, cooling, adding absolute ethyl alcohol, stirring and reacting for 5h at the rotating speed of 1000r/min to obtain ceramic particles; the medium-temperature heating temperature is 800 ℃; the high-temperature heating temperature is 1200 ℃;
(3) placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation for 3 hours at the frequency of 38kHz, performing rotary evaporation to remove a solvent, adding deionized water, stirring, adding hydroxyl cucurbituril, raising the temperature to 45 ℃, and performing stirring reaction for 50 minutes to obtain hydroxyl cucurbituril @ composite ceramic;
(4) uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding a hydrochloric acid solution with the mass fraction of 15%, dropwise adding acetone, stirring for reacting for 40min, filtering, adding water into the powder obtained after drying, and stirring and dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, stirring and reacting for 3 hours at a constant temperature of 65 ℃, and standing for 10 minutes to obtain concrete slurry;
(6) the method comprises the steps of arranging a hopper at the opening of a fixedly-installed steel pipe, adding concrete slurry into the hopper from a position 6m above the hopper, carrying out high-energy ionizing radiation on the concrete in the downward falling process of the concrete slurry, removing the hopper after pouring is finished, chiseling out floating slurry, sealing and protecting the steel pipe column, and obtaining the supporting steel pipe column.
The step (5) needs to be carried out under the condition of a magnetic field.
The high-energy ionizing radiation mode is electron beam radiation, and the high-energy ionizing radiation dose is 48 kGy.
The medium-temperature heating temperature is 800 ℃, and the medium-temperature heating time is 1 h; the high-temperature heating temperature is 1200 ℃, and the high-temperature heating time is 6 h.
A supporting steel pipe column for a deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises, by weight, 400 parts of cement, 110 parts of fly ash, 55 parts of mineral powder, 115 parts of bentonite, 40 parts of an expanding agent, 20 parts of a polymer mixed solution, 300 parts of hydroxyl cucurbituril @ composite ceramic, 350 parts of sandstone and 20 parts of a carboxylic acid water reducing agent.
The polymer mixed solution comprises the following raw material components: by weight, 30 parts of hydrochloric acid, 5 parts of acetone, 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate 30 parts, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate 40 parts, 4-butoxy-2, - (4-acryloyloxybutyloxyamide) -4, - (4-butoxybenzoate) benzoate 25 parts.
The hydroxyl cucurbituril @ composite ceramic comprises the following raw material components: 35 parts of superfine calcium carbonate, 30 parts of superfine ferroferric oxide, 20 parts of superfine titanium dioxide, 35 parts of porous alumina, 50 parts of a silane coupling agent and 70 parts of hydroxyl cucurbituril. The particle size of the porous alumina is 10 μm. The silane coupling agent is an epoxy silane coupling agent.
Example 4
This example differs from example 3 in that no hydroxycuculline @ composite ceramic was added.
Example 5
This example differs from example 3 in that no hydroxyl cucurbituril was added.
Example 6
This example differs from example 3 in that no polymer mixture was added.
Comparative example
(1) Mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding sandstone and a carboxylic acid water reducing agent, stirring and reacting for 3 hours at the constant temperature of 65 ℃, and standing for 10 minutes to obtain concrete slurry;
(2) and arranging a hopper at the mouth of the fixedly installed steel pipe, adding concrete slurry into the hopper from a position 6m above the hopper, removing the hopper after pouring, chiseling out the floating slurry, and sealing and protecting the steel pipe column to obtain the supporting steel pipe column.
A supporting steel pipe column for a deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises, by weight, 400 parts of cement, 110 parts of fly ash, 55 parts of mineral powder, 115 parts of bentonite, 40 parts of an expanding agent, 350 parts of sand and stone and 20 parts of a carboxylic acid water reducing agent.
And (3) testing: the concrete slurry prepared in the examples 1 to 7 is subjected to performance test according to GB/T50080-;
and (3) testing the fire intensity: the support steel pipes obtained in examples 1 to 7 were maintained for 28 days, placed in a muffle furnace at 900 ℃ for 60min, taken out, naturally cooled, and then the fire strength was measured according to the method for measuring compressive strength;
the test results are shown in the following table:
according to the data in the table, the concrete slurry prepared in the examples 1-3 has excellent bonding property, better bonding property with the wall of the supporting steel pipe and excellent compressive strength; in the fire passing test, the compressive strength is not obviously changed, even if the basement is in fire, the steel pipe column supporting cannot be greatly influenced, the safety performance is high, and the service life is longer.
In the embodiment 4, due to the lack of the hydroxyl cucurbituril @ composite ceramic, the mechanical property of the prepared support steel pipe is reduced to some extent compared with that of the embodiment 3, and due to the lack of the fireproof effect of the hydroxyl cucurbituril @ composite ceramic, the support steel pipe has an obvious cracking phenomenon after a fire passing test, and the fire passing strength is greatly reduced; the quality of the finally prepared supporting steel pipe is poor. In example 5, since the ceramic fine particles are not loaded with the hydroxyl cucurbituril, the interface bonding force between the prepared ceramic fine particles and the concrete slurry is reduced to some extent; on the other hand, the lack of the hydroxyl cucurbituril also enables the polymer monomer not to be modified on the ceramic particles, and in the polymer network structure in later-stage concrete slurry, the ceramic particles cannot become the bonding sites of the polymer network structure, so that stress is dispersed in time, and the compressive strength is deficient. In example 6, due to the lack of polymer mixed liquid, the adhesion between the concrete slurry and the supporting steel pipe wall is insufficient, and in the fire passing experiment, the concrete slurry shrinks, a gap appears between the concrete slurry and the steel pipe wall, and the fire passing pressure is reduced.
From the above data and experiments, we can conclude that: the hydroxyl cucurbituril @ composite ceramic has excellent fire resistance and heat insulation effect, and can avoid the problems of cracking, reduction of mechanical property, short service life and the like of a supporting steel pipe in a fire environment; the hydroxyl cucurbituril @ composite ceramic has certain induction on a magnetic field, and can be oriented in the magnetic field environment, so that the arrangement of the hydroxyl cucurbituril @ composite ceramic in concrete slurry is changed from disorder to order, and the mechanical property of the support steel pipe is further enhanced; the hydroxyl cucurbituril @ composite ceramic has more active functional groups, can have better directional compatibility with concrete slurry, is uniformly and stably arranged in the concrete slurry, and is not easy to generate a layering phenomenon.
The polymer monomer contained in the polymer solution can be complexed by the hydroxyl cucurbituril @ composite ceramic, and then is modified on the hydroxyl cucurbituril @ composite ceramic, and is polymerized under the synergistic action of a magnetic field and a high-energy electron beam to form a polymer network in the concrete slurry, so that the bonding degree of the concrete slurry is greatly improved, pores and brittle fracture between the concrete slurry and a steel pipe are avoided, and the supporting effect of supporting the steel pipe is optimized. The modification of the polymer monomer on the hydroxyl cucurbituril @ composite ceramic also maintains the stability of filler components such as the hydroxyl cucurbituril @ composite ceramic, sand, bentonite and the like in concrete slurry, and avoids the layering phenomenon of concrete.
The concrete in the supporting steel pipe prepared by the invention has high self-compaction degree, excellent mechanical property, difficult brittle fracture, difficult interface separation with the wall material of the steel pipe, excellent comprehensive performance and strong supporting effect, and can completely realize the casting of underground buildings by a deep foundation pit reverse construction method. The preparation process of the supporting steel pipe is simple, the industrial production can be realized, and the supporting steel pipe has wide market application prospect.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A processing technology for supporting a steel pipe column by a deep foundation pit reverse construction method is characterized by comprising the following steps:
(1) mixing superfine calcium carbonate, superfine ferroferric oxide and superfine titanium dioxide, adding ethanol, ball-milling for 2-3h at the rotation speed of 600-;
(2) pressing and molding the material A under the pressure condition of 120-plus-150 MPa, placing the material A in a muffle furnace, firstly heating at medium temperature for a period of time, preserving heat for 0.5-1h, then heating at high temperature for a period of time, preserving heat for 3-5h, taking out, cooling, adding absolute ethyl alcohol, stirring and reacting for 1-5h under the rotating speed condition of 600-plus-1000 r/min to obtain ceramic particles; the medium-temperature heating temperature is 600-800 ℃; the high-temperature heating temperature is 800-1200 ℃;
(3) placing a silane coupling agent in an ethanol solution, stirring and dispersing, adding ceramic particles, performing ultrasonic oscillation for 2-3h at the frequency of 30-38kHz, removing the solvent by rotary evaporation, adding deionized water, stirring, adding hydroxyl cucurbituril, raising the temperature to 35-45 ℃, and stirring for reaction for 30-50min to obtain hydroxyl cucurbituril @ composite ceramic;
(4) uniformly mixing 4-butoxy-2, - (4-methacryloxybutoxy) -4, - (butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoate) benzoate, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoate) benzoate, adding 10-15% by mass of hydrochloric acid solution, dropwise adding acetone, stirring for reaction for 30-40min, filtering, adding water into the dried powder, and stirring for dissolving to obtain a polymer mixed solution;
(5) mixing cement, fly ash, mineral powder, bentonite, an expanding agent and water, adding a polymer mixed solution, hydroxyl cucurbituril @ composite ceramic, sandstone and a carboxylic acid water reducing agent, stirring and reacting for 0.5-3h at a constant temperature of 45-65 ℃ under the condition of a magnetic field, and standing for 3-10min to obtain concrete slurry;
(6) and arranging a hopper at the mouth of the fixedly installed steel pipe, adding concrete slurry into the hopper from a position 2-6m above the hopper, performing high-energy ionizing radiation on the concrete in the process of downward falling of the concrete slurry, removing the hopper after pouring is finished, chiseling out the floating slurry, and sealing and protecting the steel pipe column to obtain the supporting steel pipe column.
2. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the supporting steel pipe column of the deep foundation pit reverse construction method comprises a steel pipe and concrete slurry; the concrete slurry is poured into the steel pipe; the concrete slurry comprises, by weight, 400 parts of cement 300-doped materials, 90-110 parts of fly ash, 45-55 parts of mineral powder, 95-115 parts of bentonite, 30-40 parts of an expanding agent, 15-20 parts of a polymer mixed solution, 300 parts of hydroxyl melon ring @ composite ceramic 200-doped materials, 350 parts of sand 250-doped materials and 15-20 parts of a carboxylic acid water reducing agent.
3. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the polymer mixed solution comprises the following raw material components: 15 to 30 parts of hydrochloric acid, 1 to 5 parts of acetone, 4-butoxy-2, - (4-methacryloyloxybutoxy) -4, - (butoxybenzoyloxy) benzoate 20 to 30 parts, 4-butoxy-2, - (4-acryloyloxybutoxy) -4, - (4-butoxybenzoyloxy) benzoate 30 to 40 parts, 4-butoxy-2, - (4-acryloyloxybutylamide) -4, - (4-butoxybenzoyloxy) benzoate 15 to 25 parts by weight.
4. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the hydroxyl cucurbituril @ composite ceramic comprises the following raw material components: 25-35 parts of superfine calcium carbonate, 20-30 parts of superfine ferroferric oxide, 10-20 parts of superfine titanium dioxide, 30-35 parts of porous alumina, 30-50 parts of a silane coupling agent and 60-70 parts of hydroxyl cucurbituril.
5. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the silane coupling agent is one or more of an aminosilane coupling agent, an epoxy silane coupling agent and a hydroxyl silane coupling agent.
6. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the particle size of the porous alumina is 1-10 μm.
7. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the high-energy ionizing radiation mode is electron beam radiation, and the high-energy ionizing radiation dose is 38-48 kGy.
8. The processing technology of the supporting steel pipe column of the deep foundation pit reverse construction method according to claim 1, characterized in that: the medium-temperature heating temperature is 600-; the high-temperature heating temperature is 800-1200 ℃, and the high-temperature heating time is 4-6 h.
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| JP2002201760A (en) * | 2000-12-28 | 2002-07-19 | Taisei Corp | Reinforced concrete column |
| CN108339417A (en) * | 2018-03-09 | 2018-07-31 | 成都新柯力化工科技有限公司 | A kind of antibacterial composite reverse osmosis membrane and preparation method of sewage disposal ring containing melon |
| CN108698930A (en) * | 2015-09-29 | 2018-10-23 | 希克里特技术有限责任公司 | Porous particle, composition, preparation method and use based on calcium silicates |
| CN109336492A (en) * | 2018-09-25 | 2019-02-15 | 李鹏宇 | A kind of high-impermeable concrete |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002201760A (en) * | 2000-12-28 | 2002-07-19 | Taisei Corp | Reinforced concrete column |
| CN108698930A (en) * | 2015-09-29 | 2018-10-23 | 希克里特技术有限责任公司 | Porous particle, composition, preparation method and use based on calcium silicates |
| CN108339417A (en) * | 2018-03-09 | 2018-07-31 | 成都新柯力化工科技有限公司 | A kind of antibacterial composite reverse osmosis membrane and preparation method of sewage disposal ring containing melon |
| CN109336492A (en) * | 2018-09-25 | 2019-02-15 | 李鹏宇 | A kind of high-impermeable concrete |
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