CN114131730B - Steel bar grouting process for assembled prefabricated wall plate of high-rise building - Google Patents
Steel bar grouting process for assembled prefabricated wall plate of high-rise building Download PDFInfo
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- CN114131730B CN114131730B CN202111471228.5A CN202111471228A CN114131730B CN 114131730 B CN114131730 B CN 114131730B CN 202111471228 A CN202111471228 A CN 202111471228A CN 114131730 B CN114131730 B CN 114131730B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/303—Alumina
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/162—Handles to carry construction blocks
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/167—Tools or apparatus specially adapted for working-up plates, panels or slab shaped building elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Architecture (AREA)
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- Structural Engineering (AREA)
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Abstract
The invention discloses a high-rise building assembly type prefabricated wallboard reinforcing steel bar grouting process, which comprises the following steps: step 1, preparing a concrete prefabricated wallboard; step 2, embedding steel bars: marking at a corresponding position of a construction site according to an embedded part layout, then positioning according to a marked embedded bolt, and then welding a reserved steel bar on the embedded bolt, wherein the reserved steel bar is ensured to be vertical to the ground in the process; step 3, mounting the prefabricated wall board; and 4, pouring the prefabricated slurry: preparing the prefabricated slurry according to the formula, firstly injecting the prefabricated slurry from a grouting opening at the bottom of the concrete prefabricated wall plate through a grouting gun, plugging the grouting opening after the completion of the injection, and curing. The high-rise building designed and constructed by the method of the invention is convenient to assemble and has more stable building structure.
Description
Technical Field
The invention relates to the field of building wallboards, in particular to a steel bar grouting process for an assembled prefabricated wallboard of a high-rise building.
Background
Along with the building is built higher and higher, it is more convenient and practical to use prefabricated wallboard to high-rise building, consequently the use of prefabricated wallboard of assembled is also more and more. The prefabricated wallboard of assembled uses also very convenient, through prefabricating the assembled wallboard in advance promptly, when the house is built, only through with prefabricated wallboard transport to the place of needs assembly install can, during the preparation of assembled wallboard component, generally build steel bar support earlier, make through grouting to steel bar support in again.
However, the grout material that current prefabricated wallboard of assembled bonds insecure to prefabricated wallboard to lead to the inaccurate problem of mounted position to appear in the use of prefabricated wallboard, some thick liquids appear fracture and hollowing phenomenon after solidifying easily, thereby make the building can appear the steadiness problem after using for a long time.
Disclosure of Invention
Aiming at the problems of infirm bonding and easy cracking and hollowing after solidification existing in the prior art in the steel bar grouting of the assembly type prefabricated wall panel, the invention aims to provide a steel bar grouting process of the assembly type prefabricated wall panel of the high-rise building.
The purpose of the invention is realized by adopting the following technical scheme:
the high-rise building assembled prefabricated wallboard reinforcing steel bar grouting process comprises the following steps:
step 1, preparing a concrete prefabricated wallboard:
selecting a die of the prefabricated wall panel according to requirements, then uniformly mixing all components according to a formula, pouring into the die, pre-installing a sleeve in the process, reserving a grouting opening at a position, close to the bottom, of the concrete prefabricated wall panel, communicating the grouting opening with the interior of the sleeve, curing to obtain the concrete prefabricated wall panel, and transporting to a construction site;
step 2, embedding steel bars:
marking corresponding positions of a construction site according to an embedded part layout, then positioning according to marked embedded bolts, and then welding reserved steel bars on the embedded bolts, wherein the reserved steel bars are ensured to be vertical to the ground in the process;
step 3, installation of the prefabricated wall panel:
hoisting the precast concrete wallboard by using a tower crane, and adjusting the direction to enable the sleeve at the bottom of the precast concrete wallboard to be inserted after aligning with the position of the reinforcing steel bar, thereby completing the installation of the precast concrete wallboard;
and 4, pouring the prefabricated slurry:
preparing the prefabricated slurry according to the formula, firstly injecting the prefabricated slurry from a grouting opening at the bottom of the concrete prefabricated wall plate through a grouting gun, plugging the grouting opening after the completion of the injection, and curing.
Preferably, in the step 1, the concrete prefabricated wall panel is transported to a construction site and then placed on a stacking rack special for the prefabricated wall.
Preferably, before the concrete prefabricated wall panel is hoisted, a gasket made of steel materials needs to be arranged on a cast-in-place layer in advance so as to facilitate the positioning of the prefabricated wall panel during installation.
Preferably, after the concrete prefabricated wall panel is installed, whether the position of the concrete prefabricated wall panel is accurate or not is determined, and then the angle of the concrete prefabricated wall panel is adjusted by using the inclined supporting structure, so that the concrete prefabricated wall panel is ensured to be vertical to the ground.
Preferably, the pressure of the grouting gun is 1-2 MPa, and the perfusion flow rate is 1.0-1.5L/min.
Preferably, the prefabricated slurry is judged to be completely poured by observing whether the prefabricated slurry is gushed out of the sleeve on top of the concrete prefabricated wall panel.
Preferably, the components of the concrete prefabricated wall panel and the components of the prefabricated slurry are concrete slurry; the concrete slurry comprises the following components in parts by weight:
150-200 parts of portland cement, 220-250 parts of fine aggregate, 316-372 parts of coarse aggregate, 15-20 parts of fly ash, 12-24 parts of modified nano boehmite, 22-30 parts of water reducing agent and 125-150 parts of water.
Preferably, the portland cement is ordinary portland cement PO42.5.
Preferably, the fine aggregate is at least one of river sand, lake sand and mountain sand, and the particle size is 0.25-4.75 mm.
Preferably, the coarse aggregate is crushed stone and/or crushed pebbles, and the particle size is 5-10 mm.
Preferably, the preparation method of the modified nano-boehmite comprises the following steps:
s1, weighing 2, 5-bis (aminomethyl) furan and epoxy group POSS, mixing the 2, 5-bis (aminomethyl) furan and the epoxy group POSS into N, N-dimethylformamide, fully stirring, adding sodium hydroxide powder, heating to 70-80 ℃, stirring and reacting for 6-8 hours, and then decompressing to remove a solvent and purifying to obtain a furyl group POSS polymer;
s2, weighing nano boehmite powder, mixing with a sodium hydroxide solution, carrying out ultrasonic homogenization, heating to 50-60 ℃, stirring for 1-3 h, filtering, washing the solid with distilled water for one time, and drying to obtain activated nano boehmite;
s3, mixing the activated nano boehmite and N-p-carboxyphenylmaleimide into N, N-dimethylformamide, dropwise adding concentrated sulfuric acid, heating to 120-160 ℃, stirring for reacting for 2-4 h, filtering, washing the solid with pure water for at least three times, and drying to obtain maleimide-based nano boehmite;
and S4, mixing maleimide-based nano boehmite and a furyl POSS polymer into chloroform, stirring and reacting for 8-10 h at room temperature, and drying to obtain the modified nano boehmite.
Preferably, in the S1, the epoxy POSS is cage-type octa (2, 3-glycidoxypropyl) POSS.
Preferably, in the S1, the mass ratio of 2, 5-bis (aminomethyl) furan to epoxy POSS to N, N-dimethylformamide is 1.2.
Preferably, in S1, the mass ratio of the sodium hydroxide powder to the N, N-dimethylformamide is 1.
Preferably, in the S2, the mass fraction of the sodium hydroxide solution is 5% to 10%.
Preferably, in the S2, the mass ratio of the nano boehmite powder to the sodium hydroxide solution is 1.
Preferably, in the S3, the mass ratio of the activated nano boehmite, the N-p-carboxyphenylmaleimide to the N, N-dimethylformamide is 1.
Preferably, in S3, the mass concentration of the concentrated sulfuric acid is 98%, and the addition amount of the concentrated sulfuric acid is 0.2% to 0.8% of the mass of the activated nano boehmite.
Preferably, in the S4, the mass ratio of the maleimide-based nano boehmite to the furyl POSS polymer to the trichloromethane is 1.
The beneficial effects of the invention are as follows:
the invention discloses a high-rise building assembly type prefabricated wallboard reinforcing steel bar grouting process which comprises the steps of prefabricating a concrete wallboard, embedding reinforcing steel bars, installing the prefabricated wallboard, pouring prefabricated slurry, and then curing. The high-rise building designed and constructed by the method of the invention is convenient to assemble and has more stable building structure.
According to the invention, the prefabricated wall panel is stably installed by using the embedded steel bars in the process, and then the prefabricated slurry is poured, so that the problem of inclination of the prefabricated wall body in the pouring process is reduced.
In the process of preparing the concrete prefabricated wall panel, the grouting opening is formed in the bottom of the prefabricated wall panel, so that subsequent grouting slurry can be conveniently poured from bottom to top, and the problem of large pressure cavity caused by pouring from top is solved.
The prefabricated slurry adopts the same material as the prefabricated concrete wall board, so that after the prefabricated slurry is poured and condensed, the prefabricated slurry can be better combined with concrete, and the problems of cracking, hollowing and poor adhesion of different types of concrete are solved.
In the prefabricated slurry and concrete prefabricated wall board material prepared by the invention, portland cement, fine aggregate and coarse aggregate are used as main base materials, and fly ash, modified nano boehmite and a water reducing agent are added as auxiliary materials. The modified nano boehmite is obtained by reacting 2, 5-bis (aminomethyl) furan containing amino with epoxy group POSS (epoxy group cage polysilsesquioxane) containing epoxy group and then reacting with nano boehmite grafted with N-p-carboxyphenylmaleimide.
According to the invention, the addition of the modified nano boehmite not only enhances the strength of concrete and reduces the cracking and hollowing of the concrete, but also has certain self-repairability.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but the present invention should not be construed as being limited to the implementable scope of the present invention.
Boehmite, also called boehmite, has a molecular formula of gamma-AlOOH (hydrated alumina), and it and diaspore, the main component of which is alpha-AlO (OH), are the main components of bauxite, and have the advantages of high heat-resistant temperature and good compatibility with organic matters, so that it has more applications in chemical production and material preparation. The nano-boehmite has serious agglomeration phenomenon in the application process, and many documents mention the problem of treating by using a surfactant, but the ideal effect is difficult to achieve.
According to the invention, boehmite containing maleimide groups is prepared by using boehmite and then combined with POSS polymer containing furyl groups, so that modified nano-boehmite is obtained, the dispersibility of the modified nano-boehmite is good, and the modified nano-boehmite not only can enhance the strength of concrete and reduce the cracking and hollowing of the concrete, but also has certain self-repairing property when added into a concrete material.
The maleimide group and the furan group can generate Diels-Alder (Diels-Alder) cycloaddition click reaction, and the reaction characteristic of boehmite containing the maleimide group and the furan group POSS polymer is used in the boehmite modification process. The Diels-Alder cycloaddition click reaction is characterized in that under the condition of room temperature without a catalyst, a reaction product of a furyl group and a maleimide group are crosslinked to form a cycloaddition reaction product, the product is decomposed into a reactant again under the condition of high temperature, and the crosslinking reaction occurs again after the temperature is reduced, so that the self-repairing is completed.
The boehmite (gamma-AlOOH) contains a large amount of hydroxyl and has certain adsorption capacity, and the activated nano boehmite is obtained by further performing hydroxyl activation treatment on the boehmite by using a sodium hydroxide solution and washing away excessive sodium hydroxide on the surface of the boehmite by using distilled water. The activated nano boehmite has richer surface hydroxyl groups and can be subjected to a binding reaction with carboxyl groups under an acidic condition, and the maleimide groups are more stable under the acidic condition, so that the carboxyl groups in the used N-p-carboxyphenylmaleimide can be subjected to an organic binding reaction with the hydroxyl groups of the activated nano boehmite to obtain the nano boehmite containing the maleimide groups.
The N-p-carboxyl phenyl maleimide is synthesized by taking maleic anhydride and p-aminobenzoic acid as raw materials, ethyl acetate as a solvent and anhydrous sodium acetate as a catalyst.
The epoxy cage polysilsesquioxane (epoxy POSS) is a cage framework structure containing epoxy bonds and has good thermodynamic stability and chemical stability. The 2, 5-bis (aminomethyl) furan containing furan groups is combined with the epoxy cage-type polysilsesquioxane, and the amino groups in the 2, 5-bis (aminomethyl) furan are utilized to initiate the ring opening of the epoxy groups of the epoxy cage-type polysilsesquioxane, so that the POSS polymer containing furan groups is obtained.
The invention is further described below with reference to the following examples.
Example 1
The high-rise building assembly type prefabricated wallboard steel bar grouting process comprises the following steps of:
step 1, preparing a concrete prefabricated wallboard:
selecting a die of the prefabricated wall board according to requirements, uniformly mixing all components according to a formula, pouring into the die, pre-installing a sleeve in the process, reserving a grouting opening at a position, close to the bottom, of the concrete prefabricated wall board, communicating the grouting opening with the interior of the sleeve, curing to obtain the concrete prefabricated wall board, and after the concrete prefabricated wall board is transported to a construction site, placing on a special stacking rack for the prefabricated wall body;
step 2, embedding steel bars:
marking at a corresponding position of a construction site according to an embedded part layout, then positioning according to a marked embedded bolt, and then welding a reserved steel bar on the embedded bolt, wherein the reserved steel bar is ensured to be vertical to the ground in the process;
step 3, installation of the prefabricated wall panel:
lifting a gasket made of steel materials on a cast-in-place layer to facilitate positioning of the prefabricated wall panel during installation, lifting the prefabricated concrete wall panel by using a tower crane, adjusting the direction to enable a sleeve at the bottom of the prefabricated concrete wall panel to be aligned with the position of a steel bar and then inserted into the sleeve, so that the prefabricated concrete wall panel is installed, determining whether the position of the prefabricated concrete wall panel is accurate or not after the prefabricated concrete wall panel is installed, and then adjusting the angle of the prefabricated concrete wall panel by using an inclined support structure to ensure that the prefabricated concrete wall panel is vertical to the ground;
and 4, pouring the prefabricated slurry:
preparing a precast slurry according to a formula, injecting the precast slurry from a grouting opening at the bottom of a concrete precast wallboard through a grouting gun, judging whether the precast slurry is completely injected or not by observing whether the precast slurry gushes out from a sleeve at the top of the concrete precast wallboard, plugging the grouting opening after the injection is finished, and curing; the pressure of the grouting gun is 1.5MPa, and the perfusion flow rate is 1.2L/min.
In the above, the components of the precast concrete wallboard and the components of the precast slurry are concrete slurry; the concrete slurry comprises the following components in parts by weight:
175 parts of ordinary portland cement PO42.5, 232 parts of fine aggregate, 354 parts of coarse aggregate, 18 parts of fly ash, 20 parts of modified nano boehmite, 24 parts of water reducing agent and 133 parts of water.
The fine aggregate is a mixture of river sand, lake sand and mountain sand, and the particle size is 0.25-4.75 mm; the coarse aggregate is broken stone with the particle size of 5-10 mm; the grain diameter of the fly ash is 50-100 mu m; the water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified nano boehmite comprises the following steps:
s1, weighing 2, 5-bis (aminomethyl) furan and cage type octa (2, 3-glycidoxypropyl) POSS, mixing into N, N-dimethylformamide, fully stirring, adding sodium hydroxide powder, heating to 75 ℃, stirring for reaction for 7 hours, reducing pressure to remove a solvent, and purifying to obtain a furyl POSS polymer; the mass ratio of 2, 5-bis (aminomethyl) furan, caged octa (2, 3-glycidoxypropyl) POSS to N, N-dimethylformamide is 1.2; the mass ratio of the sodium hydroxide powder to the N, N-dimethylformamide is 1;
s2, weighing and mixing the nano boehmite powder with a sodium hydroxide solution, uniformly performing ultrasonic treatment, heating to 55 ℃, stirring for 2 hours, filtering, washing the solid with distilled water for one time, and drying to obtain activated nano boehmite; the mass fraction of the sodium hydroxide solution is 8 percent; the mass ratio of the nano boehmite powder to the sodium hydroxide solution is 1;
s3, mixing the activated nano boehmite and N-p-carboxyphenylmaleimide into N, N-dimethylformamide, dropwise adding concentrated sulfuric acid, heating to 140 ℃, stirring for reacting for 3 hours, filtering, washing the solid with pure water for at least three times, and drying to obtain maleimide-based nano boehmite; the mass ratio of the activated nano boehmite, the N-p-carboxyphenylmaleimide to the N, N-dimethylformamide is 1.5; the mass concentration of the concentrated sulfuric acid is 98 percent, and the adding amount of the concentrated sulfuric acid is 0.6 percent of the mass of the activated nano boehmite;
s4, mixing maleimide-based nano boehmite and a furyl POSS polymer into chloroform, stirring and reacting for 8-10 h at room temperature, and drying to obtain modified nano boehmite; the mass ratio of the maleimide-based nano boehmite, the furan-based POSS polymer and the trichloromethane is 1.06.
Example 2
The high-rise building assembled prefabricated wallboard reinforcing steel bar grouting process comprises the following steps:
step 1, preparing a concrete prefabricated wallboard:
selecting a die of the prefabricated wall board according to requirements, uniformly mixing all components according to a formula, pouring into the die, pre-installing a sleeve in the process, reserving a grouting opening at a position, close to the bottom, of the concrete prefabricated wall board, communicating the grouting opening with the interior of the sleeve, curing to obtain the concrete prefabricated wall board, and after the concrete prefabricated wall board is transported to a construction site, placing on a special stacking rack for the prefabricated wall body;
step 2, embedding steel bars:
marking corresponding positions of a construction site according to an embedded part layout, then positioning according to marked embedded bolts, and then welding reserved steel bars on the embedded bolts, wherein the reserved steel bars are ensured to be vertical to the ground in the process;
step 3, installation of the prefabricated wall panel:
lifting a gasket made of steel materials on a cast-in-place layer to facilitate positioning of the prefabricated wall panel during installation, lifting the prefabricated concrete wall panel by using a tower crane, adjusting the direction to enable a sleeve at the bottom of the prefabricated concrete wall panel to be aligned with the position of a steel bar and then inserted into the sleeve, so that the prefabricated concrete wall panel is installed, determining whether the position of the prefabricated concrete wall panel is accurate or not after the prefabricated concrete wall panel is installed, and then adjusting the angle of the prefabricated concrete wall panel by using an inclined support structure to ensure that the prefabricated concrete wall panel is vertical to the ground;
and 4, pouring the prefabricated slurry:
preparing a precast slurry according to a formula, injecting the precast slurry from a grouting opening at the bottom of a concrete precast wallboard through a grouting gun, judging whether the precast slurry is completely injected or not by observing whether the precast slurry gushes out from a sleeve at the top of the concrete precast wallboard, plugging the grouting opening after the injection is finished, and curing; the pressure of the grouting gun is 1MPa, and the grouting flow rate is 1.0L/min.
In the above, the components of the precast concrete wallboard and the components of the precast slurry are concrete slurry; the concrete slurry comprises the following components in parts by weight:
150 parts of ordinary portland cement PO42.5, 220 parts of fine aggregate, 316 parts of coarse aggregate, 15 parts of fly ash, 12 parts of modified nano boehmite, 22 parts of water reducing agent and 125 parts of water.
The fine aggregate is a mixture of river sand, lake sand and mountain sand, and the particle size is 0.25-4.75 mm; the coarse aggregate is crushed pebbles with the particle size of 5-10 mm; the grain diameter of the fly ash is 50-100 mu m; the water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified nano boehmite comprises the following steps:
s1, weighing 2, 5-bis (aminomethyl) furan and cage type octa (2, 3-glycidoxypropyl) POSS, mixing into N, N-dimethylformamide, fully stirring, adding sodium hydroxide powder, heating to 70 ℃, stirring for reacting for 6 hours, reducing pressure to remove a solvent, and purifying to obtain a furyl POSS polymer; the mass ratio of 2, 5-bis (aminomethyl) furan, caged octa (2, 3-glycidoxypropyl) POSS to N, N-dimethylformamide is 1.2; the mass ratio of the sodium hydroxide powder to the N, N-dimethylformamide is 1;
s2, weighing nano boehmite powder, mixing with a sodium hydroxide solution, carrying out ultrasonic homogenization, heating to 50 ℃, stirring for 1h, filtering, washing the solid with distilled water once, and drying to obtain activated nano boehmite; the mass fraction of the sodium hydroxide solution is 5 percent; the mass ratio of the nano boehmite powder to the sodium hydroxide solution is 1;
s3, mixing the activated nano boehmite and N-p-carboxyphenylmaleimide into N, N-dimethylformamide, dropwise adding concentrated sulfuric acid, heating to 120 ℃, stirring for reacting for 2 hours, filtering, washing the solid with pure water for at least three times, and drying to obtain maleimide-based nano boehmite; the mass ratio of the activated nano boehmite, the N-p-carboxyphenylmaleimide to the N, N-dimethylformamide is 1.2; the mass concentration of the concentrated sulfuric acid is 98 percent, and the adding amount of the concentrated sulfuric acid is 0.2 percent of the mass of the activated nano boehmite;
s4, mixing maleimide-based nano boehmite and a furyl POSS polymer into chloroform, stirring and reacting for 8 hours at room temperature, and drying to obtain modified nano boehmite; the mass ratio of the maleimide-based nano boehmite, the furan-based POSS polymer and the trichloromethane is 1.
Example 3
The high-rise building assembly type prefabricated wallboard steel bar grouting process comprises the following steps of:
step 1, preparing a concrete prefabricated wallboard:
selecting a die of the prefabricated wall board according to requirements, uniformly mixing all components according to a formula, pouring into the die, pre-installing a sleeve in the process, reserving a grouting opening at a position, close to the bottom, of the concrete prefabricated wall board, communicating the grouting opening with the interior of the sleeve, curing to obtain the concrete prefabricated wall board, and placing the concrete prefabricated wall board on a special stacking frame for the prefabricated wall body after transporting the concrete prefabricated wall board to a construction site;
step 2, embedding steel bars:
marking corresponding positions of a construction site according to an embedded part layout, then positioning according to marked embedded bolts, and then welding reserved steel bars on the embedded bolts, wherein the reserved steel bars are ensured to be vertical to the ground in the process;
step 3, mounting of the prefabricated wall panel:
lifting a gasket made of steel materials on a cast-in-place layer to facilitate positioning of the prefabricated wall panel during installation, lifting the prefabricated concrete wall panel by using a tower crane, adjusting the direction to enable a sleeve at the bottom of the prefabricated concrete wall panel to be aligned with the position of a steel bar and then inserted into the sleeve, so that the prefabricated concrete wall panel is installed, determining whether the position of the prefabricated concrete wall panel is accurate or not after the prefabricated concrete wall panel is installed, and then adjusting the angle of the prefabricated concrete wall panel by using an inclined support structure to ensure that the prefabricated concrete wall panel is vertical to the ground;
and 4, pouring the prefabricated slurry:
preparing a precast slurry according to a formula, firstly injecting the precast slurry from a grouting opening at the bottom of a concrete precast wallboard through a grouting gun, judging whether the precast slurry is completely injected or not by observing whether the precast slurry gushes out from a sleeve at the top of the concrete precast wallboard, plugging the grouting opening after the injection is finished, and curing; the pressure of the grouting gun is 2MPa, and the perfusion flow rate is 1.5L/min.
In the above, the components of the precast concrete wall panel and the components of the precast concrete slurry are both concrete slurry; the concrete slurry comprises the following components in parts by weight:
200 parts of ordinary portland cement PO42.5, 250 parts of fine aggregate, 372 parts of coarse aggregate, 20 parts of fly ash, 24 parts of modified nano boehmite, 30 parts of water reducing agent and 150 parts of water.
The fine aggregate is a mixture of river sand, lake sand and mountain sand, and the particle size is 0.25-4.75 mm; the coarse aggregate is broken stone with the particle size of 5-10 mm; the grain diameter of the fly ash is 50-100 mu m; the water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified nano boehmite comprises the following steps:
s1, weighing 2, 5-bis (aminomethyl) furan and cage type octa (2, 3-glycidoxypropyl) POSS, mixing into N, N-dimethylformamide, fully stirring, adding sodium hydroxide powder, heating to 80 ℃, stirring for reacting for 8 hours, reducing pressure to remove a solvent, and purifying to obtain a furyl POSS polymer; the mass ratio of 2, 5-bis (aminomethyl) furan, cage octa (2, 3-glycidoxypropyl) POSS to N, N-dimethylformamide is 1.2; the mass ratio of the sodium hydroxide powder to the N, N-dimethylformamide is 1;
s2, weighing and mixing the nano boehmite powder with a sodium hydroxide solution, uniformly performing ultrasonic treatment, heating to 60 ℃, stirring for 3 hours, filtering, washing the solid with distilled water for one time, and drying to obtain activated nano boehmite; the mass fraction of the sodium hydroxide solution is 10 percent; the mass ratio of the nano boehmite powder to the sodium hydroxide solution is 1;
s3, mixing the activated nano boehmite and N-p-carboxyphenylmaleimide into N, N-dimethylformamide, dropwise adding concentrated sulfuric acid, heating to 160 ℃, stirring for reacting for 4 hours, filtering, washing the solid with pure water for at least three times, and drying to obtain maleimide-based nano boehmite; the mass ratio of the activated nano boehmite, the N-p-carboxyphenylmaleimide to the N, N-dimethylformamide is 1.8; the mass concentration of the concentrated sulfuric acid is 98 percent, and the adding amount of the concentrated sulfuric acid is 0.8 percent of the mass of the activated nano boehmite;
s4, mixing maleimide-based nano boehmite and a furyl POSS polymer into chloroform, stirring and reacting for 10 hours at room temperature, and drying to obtain modified nano boehmite; the mass ratio of the maleimide-based nano boehmite, the furan-based POSS polymer and the trichloromethane is 1.68.
Comparative example
The high-rise building assembly type prefabricated wallboard reinforcing steel bar grouting process is different from the process in embodiment 1 in that:
the concrete slurry comprises the following components in parts by weight:
175 parts of ordinary portland cement PO42.5, 232 parts of fine aggregate, 354 parts of coarse aggregate, 18 parts of fly ash, 20 parts of nano boehmite, 24 parts of water reducing agent and 133 parts of water.
In order to more clearly illustrate the invention, the concrete slurry prepared in the embodiments 1 to 3 and the comparative example is poured, the covering and maintenance are continued for seven days after the pouring, the performance is detected, the compressive strength is detected according to the standard GB/T50081-2011, the crack resistance grade is judged according to the requirement of the concrete structure design specification, the contractibility is detected according to the standard GB/T11972-1997 (21 days), the hollowing rate is the percentage of the hollowing area of the detected concrete at the 90 th day after the pouring is finished, and the result is shown in Table 1:
TABLE 1 concrete slurry pour Performance test
| Example 1 | Example 2 | Example 3 | Comparative example | |
| 28 day compressive strength (MPa) | 128.5 | 121.2 | 133.6 | 104.9 |
| Crack resistance/grade | Ⅰ | Ⅰ | Ⅰ | Ⅱ |
| Shrinkage (μm/m) | 612 | 627 | 618 | 883 |
| Empty ratio (%) | ＜1 | ＜1 | ＜1 | 2.7 |
In order to verify self-repairing performance, the concrete prepared in example 1 and the concrete prepared in the comparative example are directly and rapidly dried after being not subjected to early-stage curing for 1 day in the preparation process, so that cracks are formed, the concrete prepared in example 1 and the concrete prepared in the comparative example after the cracks are formed are soaked in water for 30min and then are placed in an oven at 100 ℃ for treatment for 20min, and then are taken out and naturally cooled to room temperature, so that obvious repair of the cracks on the surface of the concrete prepared by the method in example 1 can be observed, and the concrete prepared in the comparative example is almost unchanged.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The high-rise building assembly type prefabricated wallboard steel bar grouting process is characterized by comprising the following steps of:
step 1, preparing a concrete prefabricated wallboard:
selecting a mould of the prefabricated wallboard according to requirements, uniformly mixing all components according to a formula, pouring into the mould, pre-installing a sleeve in the process, reserving a grouting opening at a position, close to the bottom, of the concrete prefabricated wallboard, communicating the grouting opening with the interior of the sleeve, maintaining to obtain the concrete prefabricated wallboard, and transporting to a construction site;
step 2, embedding steel bars:
marking at a corresponding position of a construction site according to an embedded part layout, then positioning according to a marked embedded bolt, and then welding a reserved steel bar on the embedded bolt, wherein the reserved steel bar is ensured to be vertical to the ground in the process;
step 3, mounting of the prefabricated wall panel:
hoisting the precast concrete wallboard by using a tower crane, and adjusting the direction to enable the sleeve at the bottom of the precast concrete wallboard to be inserted after aligning with the position of the reinforcing steel bar, thereby completing the installation of the precast concrete wallboard;
and 4, pouring the prefabricated slurry:
preparing a prefabricated slurry according to a formula, firstly injecting the prefabricated slurry from a grouting opening at the bottom of the concrete prefabricated wall plate through a grouting gun, plugging the grouting opening after the completion of the injection, and curing;
the components of the concrete prefabricated wall board and the components of the prefabricated slurry are concrete slurry; the concrete slurry comprises the following components in parts by weight:
150-200 parts of portland cement, 220-250 parts of fine aggregate, 316-372 parts of coarse aggregate, 15-20 parts of fly ash, 12-24 parts of modified nano boehmite, 22-30 parts of water reducing agent and 125-150 parts of water;
the preparation method of the modified nano boehmite comprises the following steps:
s1, weighing 2, 5-bis (aminomethyl) furan and epoxy POSS, mixing the 2, 5-bis (aminomethyl) furan and the epoxy POSS into N, N-dimethylformamide, fully stirring, adding sodium hydroxide powder, heating to 70-80 ℃, stirring for reacting for 6-8 hours, and then removing a solvent under reduced pressure and purifying to obtain a furyl POSS polymer;
s2, weighing and mixing the nano boehmite powder with a sodium hydroxide solution, uniformly performing ultrasonic treatment, heating to 50-60 ℃, stirring for 1-3 h, filtering, washing the solid with distilled water for one time, and drying to obtain activated nano boehmite;
s3, mixing the activated nano boehmite and N-p-carboxyphenylmaleimide into N, N-dimethylformamide, dropwise adding concentrated sulfuric acid, heating to 120-160 ℃, stirring for reacting for 2-4 h, filtering, washing the solid with pure water for at least three times, and drying to obtain maleimide-based nano boehmite;
and S4, mixing maleimide-based nano boehmite and a furyl POSS polymer into chloroform, stirring and reacting for 8-10 h at room temperature, and drying to obtain the modified nano boehmite.
2. The high-rise building assembly type prefabricated wall panel steel bar grouting process according to claim 1, wherein in the step 1, the concrete prefabricated wall panel is transported to a construction site and then placed on a stacking rack special for a prefabricated wall body.
3. The high-rise building assembly type prefabricated wall panel steel bar grouting process as claimed in claim 1, wherein a gasket made of steel materials needs to be arranged on a cast-in-place layer in advance before the concrete prefabricated wall panel is hoisted by a tower crane, so that the prefabricated wall panel can be conveniently positioned during installation.
4. The high-rise building assembly type prefabricated wall panel rebar grouting process of claim 1, wherein after the concrete prefabricated wall panel is installed, whether the position of the concrete prefabricated wall panel is accurate or not is determined, and then an angle of the concrete prefabricated wall panel is adjusted by using the inclined supporting structure, so that the concrete prefabricated wall panel is ensured to be vertical to the ground.
5. The high-rise building assembly type prefabricated wall panel steel bar grouting process according to claim 1, wherein the pressure of the grouting gun is 1-2 MPa, and the grouting flow rate is 1.0-1.5L/min.
6. The process of grouting reinforcement for prefabricated wall panels of high-rise buildings according to claim 1, wherein the portland cement is ordinary portland cement PO42.5.
7. The high-rise building fabricated prefabricated wall panel steel bar grouting process according to claim 1, wherein the fine aggregate is at least one of river sand, lake sand and mountain sand, and the particle size is 0.25-4.75 mm.
8. The high-rise building assembly type prefabricated wall panel steel bar grouting process according to claim 1, wherein the coarse aggregate is broken stone and/or broken pebbles, and the particle size is 5-10 mm.
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| US9056791B2 (en) * | 2013-02-14 | 2015-06-16 | Sasol North America, Inc. | Cement compositions containing nano sized boehmite crystallites |
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| CN106988482A (en) * | 2017-04-07 | 2017-07-28 | 中建科技有限公司深圳分公司 | Sleeve connection prefabricated panel and its making, transport, installation method |
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| CN110835979A (en) * | 2019-11-29 | 2020-02-25 | 上海宝冶集团有限公司 | Assembled wall reinforcing steel sleeve grouting process |
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