CN113601697A - Hollow column manufacturing method and manufacturing mold thereof - Google Patents
Hollow column manufacturing method and manufacturing mold thereof Download PDFInfo
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- CN113601697A CN113601697A CN202110920792.4A CN202110920792A CN113601697A CN 113601697 A CN113601697 A CN 113601697A CN 202110920792 A CN202110920792 A CN 202110920792A CN 113601697 A CN113601697 A CN 113601697A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 168
- 239000000463 material Substances 0.000 claims abstract description 95
- 230000002787 reinforcement Effects 0.000 claims abstract description 51
- 238000005119 centrifugation Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- 229910052925 anhydrite Inorganic materials 0.000 claims description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 11
- 239000000945 filler Substances 0.000 description 9
- 239000011178 precast concrete Substances 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Images
Classifications
-
- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/68—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts and applying centrifugal forces
-
- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/80—Moulds adapted to centrifugal or rotational moulding
Abstract
The invention relates to the technical field of prefabricated buildings, in particular to a method for manufacturing a hollow column and a manufacturing mold thereof. The manufacturing method of the hollow column comprises the following steps: placing the reinforcement cage fixed with the inner die into the outer die; filling a first concrete material into the outer mould, and sealing a cavity of the outer mould; centrifuging for the first time according to first preset parameters to form a concrete shell by the first concrete material; standing the concrete shell for A minutes; filling a second concrete material into the concrete shell; and carrying out second centrifugation according to second preset parameters so as to enable the second concrete material to be formed into a rough layer embedded into the inner surface of the concrete shell. According to the hollow column manufacturing method provided by the invention, the prefabricated shell and the reinforcement cage are integrally formed by adopting a secondary centrifugal process, the rough layer on the inner surface of the concrete shell is in a concave-convex structure form, and the bonding performance of the prefabricated concrete column and the core cast-in-place concrete interface is improved.
Description
Technical Field
The invention relates to the technical field of prefabricated buildings, in particular to a method for manufacturing a hollow column and a manufacturing mold thereof.
Background
The precast concrete structure becomes an important component of building industrialization in China due to the characteristics of quick construction, easily controlled quality, low energy consumption, short construction period and the like. The prefabricated shell of the prefabricated concrete pipe column is not only a template of core cast-in-place concrete during construction, but also a part of a construction load supporting system; the precast concrete pipe column and the core cast-in-place concrete exert respective advantages, the precast concrete pipe column provides effective lateral restraint for the core cast-in-place concrete in the stress process, the bearing capacity and the ductility of the combined member can be improved, the integrity of the connection of the assembled nodes can be enhanced by the core cast-in-place concrete, and the anti-seismic performance of the nodes is improved.
The bonding performance of the interface between the precast concrete pipe column and the core cast-in-place concrete has important influence on the stress integrity of the precast concrete combined pipe column, the bonding damage at the interface can cause the stripping and the damage of the precast shell wall and the core cast-in-place concrete, and the ductility and the energy consumption capability of the component are reduced. However, in the prior art, due to reasons such as a preparation process, the bonding performance of the interface between the precast concrete pipe column and the core cast-in-place concrete is insufficient.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of insufficient bonding property of the interface between the precast concrete pipe column and the core cast-in-place concrete in the prior art, so that the method for manufacturing the hollow column capable of improving the bonding property of the interface is provided.
The invention aims to solve another technical problem of overcoming the defect of insufficient bonding property of the interface between the precast concrete pipe column and the core cast-in-place concrete in the prior art, thereby providing a hollow column preparation mold capable of improving the bonding property of the interface.
In order to solve the technical problem, the invention provides a method for manufacturing a hollow column, which comprises the following steps:
s1: placing the reinforcement cage fixed with the inner die into the outer die;
s2: filling a first concrete material into the outer mould, and sealing a cavity of the outer mould;
s3: centrifuging for the first time according to first preset parameters to form a concrete shell by the first concrete material;
s4: standing the concrete shell for A minutes, wherein A is more than 0;
s5: filling a second concrete material into the concrete shell;
s6: and carrying out second centrifugation according to second preset parameters so as to enable the second concrete material to be formed into a rough layer embedded into the inner surface of the concrete shell.
Optionally, the step S1: the steel reinforcement cage that will be fixed with interior mould is placed in outer mould, includes:
s11: manufacturing the reinforcement cage;
s12: placing the inner die in the reinforcement cage;
s13: and placing the reinforcement cage in a lower die body of the outer die.
Optionally, the step S2: filling the first concrete material into the outer mould and sealing the cavity of the outer mould, comprising:
s21: end plates are arranged on the end faces of the two ends of the outer die in the length direction to form a groove-shaped accommodating cavity;
s22: filling the first concrete material into the groove-shaped accommodating cavity;
s23: and installing an upper die body to seal the cavity of the outer die.
Optionally, the step S3: centrifuging for the first time according to first preset parameters to make first concrete material shaping for the concrete shell, including:
s31: the rotation speed is 60-90 r/min, and the operation is 180-200 s;
s32: running for 60-90 s at the rotating speed of 120-160 r/min;
s33: operating at the rotating speed of 300-350 r/min for 120-150 s;
s34: running for 300-360 s at the rotating speed of 380-450 rpm;
s35: pouring out the residual slurry of the first concrete material;
wherein the total time from S31 to S34 is controlled within 9-12 min, and each 1m3The first concrete mass yields 0.04m3To 0.06m3And (4) residual slurry.
Optionally, the standing time A is 30-60 min.
Optionally, the step S6: centrifuging for the second time according to second preset parameters to enable the second concrete material to be formed into a rough layer embedded into the inner surface of the concrete shell, and the method comprises the following steps:
s61: operating at the rotating speed of 60-90 r/min for 120-150 s;
s62: running for 60-90 s at the rotating speed of 120-160 r/min;
s63: the rotation speed is 300-350 r/min, and the operation lasts 180-240 s;
s64: pouring out the excess second concrete material;
wherein the total time from S61 to S63 is controlled within 6min to 8 min.
Optionally, the method further includes: s7: curing the hollow column according to the curing parameters; the S7 specifically includes:
s71: standing for 1.5-2 h;
s72: heating at a speed of 20-25 ℃/h;
s73: keeping the temperature constant, controlling the constant temperature at 70 +/-5 ℃, keeping the temperature constant for 3-4.5 hours,
s74: and (5) cooling.
Optionally, the first concrete material comprises: 320-390 parts of cement, 40-90 parts of mineral powder, 0-25 parts of anhydrite powder, 630-710 parts of sand, 1200-1300 parts of stone, 120-130 parts of water and 1.5-4.0 parts of a water reducing agent;
wherein the cement is portland cement with a strength grade of 42.5 or 52.5; the mineral powder is S95 grade, and the specific surface area is 420m 2/kg; the anhydrite powder has the specific surface area of 400m2/kg, the fineness of 200 meshes and the sieving rate of 0.80mm smaller than 0.1 percent; the fineness modulus of the sand is 2.5-3.0, and the mud content is not more than 3.0%; the stone is pebbles or broken stones, the particle size range is 5 mm-25 mm, and the mud content is not more than 1.0%; the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is not lower than 25%, and the content of chloride ions is not more than 0.6%.
Optionally, the second concrete material comprises:
the first concrete material and the residual slurry of the first concrete material; wherein the concentration of the cementing material of the first concrete material is 30-40%;
the mixing amount of the residual slurry of the first concrete material is 5-10% of the mass of the second concrete material;
the utilization time T of the residual slurry of the first concrete material is less than or equal to 20 min;
the utilization time of the residual slurry refers to the time interval from the end of the first centrifugation to the addition of the newly stirred first concrete material. .
The hollow column preparation mold provided by the invention is used for the hollow column preparation method; the hollow column preparation mold comprises:
the outer die is suitable for placing a reinforcement cage;
and the inner die is fixedly connected with the reinforcement cage and is suitable for forming a cavity between the inner die and the outer die.
The technical scheme of the invention has the following advantages:
1. according to the hollow column manufacturing method provided by the invention, the prefabricated shell and the reinforcement cage are integrally formed by adopting a secondary centrifugal process, the rough layer on the inner surface of the concrete shell is in a concave-convex structure form, and the bonding performance of the prefabricated concrete column and the core cast-in-place concrete interface is improved; meanwhile, the adhesion of concrete slurry to the hollow inner reinforcement cage is avoided, and the bond stress of post-cast concrete to the reinforcement is influenced.
2. According to the method for manufacturing the hollow column, the quality of the hollow column is ensured by setting the reasonable standing time, and the phenomenon that the hollow column is easy to collapse due to too short time interval of two times of centrifugation is avoided; meanwhile, the phenomenon that the concrete structure is damaged due to the fact that the time interval between two times of centrifugation is too long, when the time interval is longer, the first centrifugal concrete is already initially set, the internal structure is basically stable, and the second centrifugal concrete cannot disturb the first centrifugal concrete, and particularly exceeds the remolding time range after the initial setting of the concrete.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a reinforcement cage of the present invention;
FIG. 2 is a schematic view showing an assembled state of an inner mold and a reinforcement cage;
FIG. 3 is a schematic view of a reinforcement cage disposed in a lower mold body;
FIG. 4 is a schematic illustration of the pouring of first-time centrifugal concrete;
FIG. 5 is a schematic view of the closing of the outer mold;
FIG. 6 is a schematic illustration of the formation of a concrete shell after the initial centrifugation;
FIG. 7 is a schematic view of the concrete shell with the inner mold removed;
FIG. 8 is a schematic illustration of the placement of secondary centrifugal concrete;
FIG. 9 is a schematic illustration of the formation of a rough layer within the concrete shell after the second centrifugation;
FIG. 10 is a schematic view of the inner round cavity post after it has been formed;
FIG. 11 is a schematic view of the square cavity post of the present invention after it has been formed;
fig. 12 is a schematic view of the welded cavity post of the present invention after it is formed.
Description of reference numerals:
10-reinforcement cage, 11-vertical stirrup, 12-horizontal stirrup, 13-longitudinal reinforcement, 14-outer stirrup and 15-welding part;
20-inner mould, 30-outer mould, 31-lower mould body, 32-upper mould body, 33-longitudinal rib, 34-fastener, 41-concrete shell, 42-rough layer and 43-cavity.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1 to 12, the method for manufacturing a hollow column according to this embodiment includes:
s1: placing the reinforcement cage 10 fixed with the inner mold 20 in the outer mold 30;
s2: filling the outer mold 30 with a first concrete material, and closing the cavity of the outer mold 30;
s3: centrifuging for the first time according to a first preset parameter to form a concrete shell 41 from the first concrete material;
s4: standing the concrete shell 41 for A minutes, wherein A is more than 0;
s5: filling a second concrete material into the concrete shell 41;
s6: and carrying out second centrifugation according to second preset parameters so as to form a second concrete material into a rough layer 42 embedded in the inner surface of the concrete shell 41.
Preferably, the rough layer on the inner surface of the concrete shell 41 is configured in an uneven structure, and preferably, the average depth difference between the concave part and the convex part is more than 6mm, so that the bonding performance of the interface between the precast concrete pipe column and the core cast-in-place concrete is improved.
Preferably, the rough layer 42 may be a stone structure of coarse bone particles surrounding the inner surface of the concrete shell 41. The inner ring of rough layer 42 is adapted to form a cavity 43, and the cavity 43 is adapted to be filled with core cast in place concrete.
According to the method for manufacturing the hollow column, the prefabricated shell and the reinforcement cage are integrally formed by adopting a secondary centrifugal process, the rough layer on the inner surface of the concrete shell 41 is in a concave-convex structure form, and the bonding performance of the interface between the prefabricated concrete column and the core cast-in-place concrete is improved; meanwhile, the adhesion of concrete slurry to the hollow inner reinforcement cage is avoided, and the bond stress of post-cast concrete to the reinforcement is influenced.
Specifically, the step S1: the reinforcement cage 10 fixed with the inner mold 20 is placed in the outer mold 30, including:
s11: manufacturing the reinforcement cage 10;
s12: placing the inner mold 20 in the reinforcement cage 10;
s13: the reinforcement cage 10 is placed in the lower mold body 31 of the outer mold 30.
Preferably, the inner mold 20 is made of an inflatable bladder.
The reinforcement cage 10 may be formed by welding longitudinal ribs and horizontal mesh ribs, and as an implementation form, the horizontal mesh ribs are formed by welding a plurality of reinforcing steel bars in a criss-cross manner; as another implementation form, the horizontal mesh reinforcement bars may also be formed by welding all or part of the stirrups.
The inner die 20 can be specifically a long-strip-shaped filler, the long-strip-shaped filler is placed in a steel bar cage, the maximum distance between the filler and surrounding steel bars is not more than 5mm, and the distance between adjacent fillers is not more than 20 mm. When using an inflatable bladder, the inflation pressure should stop with the bladder walls contacting the reinforcement. The filling operation may be performed after the reinforcement cage is processed, or may be performed while the reinforcement cage is placed in the outer mold 30.
The inner surface of the outer die 30 is matched with the shape of the outer ring of the reinforcement cage 10, so that the reinforcement cage 10 is clamped inside the outer die 30. The outer die 30 comprises a lower die body 31 and an upper die body 32, the reinforcement cage 10 is suitable for being placed between the lower die body 31 and the upper die body 32, and the lower die body 31 and the upper die body 32 are of a symmetrical structure.
Preferably, a cushion block is arranged at the joint position of the reinforcement cage and the outer mold 30, so that the thickness of the concrete protective layer of the outermost reinforcement is not less than 20mm after the concrete is solidified.
Specifically, the step S2: filling the outer mold 30 with a first concrete material and closing the cavity of the outer mold 30, comprising:
s21: end plates are arranged on the end faces of the two ends of the outer die 30 in the length direction to form a groove-shaped accommodating cavity;
s22: filling the first concrete material into the groove-shaped accommodating cavity;
s23: an upper mold body 32 is installed to close the cavity of the outer mold 30.
The both ends terminal surface of the length direction of outer mould 30 is provided with first end plate and second end plate respectively, and after both sides end plate and outer mould 30 were fixed, it holds the chamber to form the cell type between end plate and the outer mould 30.
Firstly, one side end plate is installed, the reinforcing steel bars at one end of the reinforcing steel bar cage extend out of the end plate through reinforcing steel bar holes in the end plate, then the other side end plate is installed, the reinforcing steel bars extend out of the end plate, and the two side end plates and the lower die body are fixed through bolts.
Then, step S22 is performed, the first concrete material is filled into the groove-shaped accommodating cavity, and particularly, the material can be uniformly distributed along the longitudinal direction of the lower die body through a distributing device; preferably, the first concrete material is used in an amount calculated according to the volume of the member, and 20% of moisture and 5% to 8% of cement loss are considered, and a part of the first concrete material is left for standby.
Subsequently, step S23 is performed to buckle the upper mold body into the lower mold body, and then fix the upper mold body with the lower mold body and the two side end plates through bolts to close the cavity of the outer mold 30.
Specifically, the step S3: centrifuging for the first time according to first preset parameters to form the first concrete material into the concrete shell 41, comprising:
s31: the rotation speed is 60-90 r/min, and the operation is 180-200 s;
s32: running for 60-90 s at the rotating speed of 120-160 r/min;
s33: operating at the rotating speed of 300-350 r/min for 120-150 s;
s34: running for 300-360 s at the rotating speed of 380-450 rpm;
s35: pouring out the residual slurry of the first concrete material;
wherein the total time from S31 to S34 is controlled within 9-12 min, and each 1m3The first concrete mass yields 0.04m3To 0.06m3And (4) residual slurry.
Preferably, every 1m3The first concrete mass preferably yields 0.05m30.05m of residual slurry3The weight of the residual slurry is about 90kg, wherein the weight of the cementing material is about 35kg, the weight of the water is about 50kg, the weight of the sand is about 5kg, the water-cement ratio is about 0.50, if the proportion of the residual slurry mixed in the freshly mixed first concrete material is 5%, the water-cement ratio of the obtained second concrete material is changed from 0.26-0.33 to 0.33-0.46.
Preferably, the cementing material can be a plurality of systems, so that the first concrete material can be changed according to different cementing material systems, the cementing material can be composed of cement, mineral powder, anhydrite powder, sand, an additive and water, or composed of cement, fly ash, sand, an additive and water, and the content of the additive is very small and can be ignored. In the step S3, performing a first centrifugation according to a first preset parameter, wherein the first centrifugation process is divided into four stages, namely a low speed stage, a low medium speed stage, a medium speed stage and a high speed stage, and is performed according to preset parameters respectively. And after the first centrifugation is finished, pouring out the residual slurry of the first concrete material for later use.
Furthermore, in the first centrifugation process, the flowability of the fresh concrete is recovered through overturning of the low-speed steel die, the fresh concrete is uniformly distributed on the die wall at low and medium speeds, the material is continuously uniformly distributed at medium speed, the internal and external layering is reduced, the compactness and impermeability are improved, and the compactness is realized through high-speed centrifugation.
Specifically, the standing time A is 30-60 min.
In the step S4, the concrete casing 41 is left standing for a minute, wherein a is preferably 30 to 60 min.
According to the method for manufacturing the hollow column, the quality of the hollow column is ensured by setting the reasonable standing time, and the phenomenon that the hollow column is easy to collapse due to too short time interval of two times of centrifugation is avoided; meanwhile, the phenomenon that the concrete structure is damaged due to the fact that the time interval between two times of centrifugation is too long, when the time interval is longer, the first centrifugal concrete is already initially set, the internal structure is basically stable, and the second centrifugal concrete cannot disturb the first centrifugal concrete, and particularly exceeds the remolding time range after the initial setting of the concrete.
Specifically, the step S6: and carrying out second centrifugation according to second preset parameters to form a second concrete material into a rough layer 42 embedded in the inner surface of the concrete shell 41, wherein the second centrifugation comprises the following steps:
s61: operating at the rotating speed of 60-90 r/min for 120-150 s;
s62: running for 60-90 s at the rotating speed of 120-160 r/min;
s63: the rotation speed is 300-350 r/min, and the operation lasts 180-240 s;
s64: pouring out the excess second concrete material;
wherein the total time from S61 to S63 is controlled within 6min to 8 min.
In step S5, a second concrete material is filled into the concrete casing 41, and fluid concrete is fed into the mold by opening the end plate hole on the outer mold 30.
In the step S6, performing a second centrifugation according to a second preset parameter, wherein the second centrifugation process is divided into three stages, namely a low speed stage, a medium speed stage and a high speed stage, and is performed according to the preset parameter. And pouring out the residual slurry after the second centrifugation is finished.
The maximum rotating speed of the second centrifugal process is lower than that of the first centrifugal process, the time is shortened, the bonding of the fluid concrete and the initial concrete can be met, and the impact damage of the fluid concrete to the initial concrete can be avoided. Preferably, the time interval between the beginning of the second centrifugation and the end of the first centrifugation is preferably 50-80 min.
Compared with the first concrete material, the second concrete material is composed of the first concrete material and the residual slurry of the first concrete material, the strength is slightly reduced, the use requirement is met, the deviation from the strength of the first centrifugal concrete is not large, the overall coordination performance is good, and the policies of energy conservation, emission reduction and solid waste recycling are met.
Preferably, before the second centrifugation, the end plate hole is closed and the centrifuge is started.
Specifically, the method further comprises the following steps: s7: curing the hollow column according to the curing parameters; the S7 specifically includes:
s71: standing for 1.5-2 h;
s72: heating at a speed of 20-25 ℃/h;
s73: keeping the temperature constant, controlling the constant temperature at 70 +/-5 ℃, keeping the temperature constant for 3-4.5 hours,
s74: and (5) cooling.
Through step S7, the hollow columns are cured according to the curing parameters, and the turnover of the mold can be accelerated. Preferably, the steam curing is preferably considered in the curing mode, the curing process is divided into four stages of standing still, heating, constant temperature and cooling, and each stage is carried out according to preset parameters. Wherein the constant temperature time of the step S73 is based on the demolding strength; the temperature decrease in step S74 needs to be performed slowly. In addition, when the conditions are not allowed, natural curing can be selected, but the demolding time needs to be properly prolonged, the summer time is controlled to be 12-24 hours, and the winter time is longer.
After the step S7, the off-site maintenance may be performed periodically, and generally before the age reaches 28d, the watering maintenance, the film coating maintenance or the maintenance by spraying the curing agent is performed appropriately, so as to avoid the sun exposure and reduce the occurrence of cracks on the surface of the component due to too fast water loss.
Specifically, the first concrete material includes: 320-390 parts of cement, 40-90 parts of mineral powder, 0-25 parts of anhydrite powder, 630-710 parts of sand, 1200-1300 parts of stone, 120-130 parts of water and 1.5-4.0 parts of a water reducing agent;
wherein the cement is portland cement with a strength grade of 42.5 or 52.5; the mineral powder is S95 grade, and the specific surface area is 420m 2/kg; the anhydrite powder has the specific surface area of 400m2/kg, the fineness of 200 meshes and the sieving rate of 0.80mm smaller than 0.1 percent; the fineness modulus of the sand is 2.5-3.0, and the mud content is not more than 3.0%; the stone is pebbles or broken stones, the particle size range is 5 mm-25 mm, and the mud content is not more than 1.0%; the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is not lower than 25%, and the content of chloride ions is not more than 0.6%.
The main properties of the first concrete material are as follows: the initial slump is 70-90 mm, the 30min slump is 50-70 mm, the compressive strength of standard culture 1d is 20 MPa-30 MPa, the compressive strength of standard culture 7d is 35 MPa-50 MPa, and the compressive strength of standard culture block 28d is 50 MPa-60 MPa.
Additionally, the first concrete material can also be selected from a full cement cementing material system or a cement-fly ash cementing material system, the used fly ash is not lower than II grade, and the fineness (45um square hole sieve residue) is not more than 25%.
Specifically, the second concrete material includes:
the first concrete material and the residual slurry of the first concrete material are mixed, wherein the concentration of the cementing material of the first concrete material is 30-40%;
the mixing amount of the residual slurry of the first concrete material is 5-10% of the mass of the second concrete material;
the utilization time T of the residual slurry of the first concrete material is less than or equal to 20 min;
the utilization time of the residual slurry refers to the time interval from the end of the first centrifugation to the addition of the newly stirred first concrete material. .
Preferably, after the remaining slurry of the first concrete material is stopped for a period of time, the stopping time is generally 30min, and cement in the remaining slurry can generate hydration reaction, and the remaining slurry thickens until being coagulated along with the time. Therefore, the control of the concentration, the mixing amount and the utilization time of the residual slurry are key factors for preparing the secondary centrifugal concrete.
The concentration of the cementing material of the first concrete material is 30-40%, so that the strength of the concrete can be effectively ensured, and the hydration reaction time of the residual slurry can be prolonged.
The mixing amount of the residual slurry of the first concrete material is 5-10% of the mass of the second concrete material, and the workability and the mechanical property of the second concrete material can be effectively ensured.
The utilization time T of the residual slurry of the first concrete material is less than or equal to 20min, and the mechanical property of the secondary centrifugal concrete can be effectively ensured.
The main properties of the second concrete material are as follows: the initial slump is 70-120 mm, the 30min slump is 50-70 mm, the standard-maintained 1d compressive strength is 15 MPa-25 MPa, the standard-maintained 7d compressive strength is 30 MPa-45 MPa, and the standard-maintained 28d compressive strength is 40 MPa-50 MPa. The slight decrease in the strength of the second concrete material is mainly caused by the increase of the water-cement ratio caused by the mixing of the residual slurry.
Example two
Referring to fig. 1 to 5, the present embodiment provides a hollow column manufacturing mold for the hollow column manufacturing method according to the first embodiment; the hollow column preparation mold comprises:
an outer mold 30 adapted to receive the reinforcement cage 10 therein;
and the inner die 20 is fixedly connected with the reinforcement cage 10 and is suitable for forming a cavity with the outer die 30.
As shown in fig. 10 and 11, the reinforcement cage 10 includes: the steel bars 13 are arranged in parallel along the length direction, the longitudinal steel bars 13 are bound through outer stirrups 14, and a plurality of vertical stirrups 11 and a plurality of horizontal stirrups 12 are arranged between the outer stirrups 14; preferably, the connection form of the vertical stirrup 11 and the outer stirrup 14 and the connection form of the horizontal stirrup 12 and the outer stirrup 14 can both adopt a binding mode and also can adopt a welding mode, so that a welding part 15 is formed at the connection position of the vertical stirrup 11 or the horizontal stirrup 12 and the outer stirrup 14.
In this embodiment, the cross section of the reinforcement cage 10 is configured as a square structure, and the reinforcement cage 10 extends to form a square column structure; the inner surface of the outer die 30 is matched with the shape of the outer ring of the reinforcement cage 10, so that the reinforcement cage 10 is clamped inside the outer die 30. The outer die 30 comprises a lower die body 31 and an upper die body 32, the reinforcement cage 10 is suitable for being placed between the lower die body 31 and the upper die body 32, and the lower die body 31 and the upper die body 32 are of a symmetrical structure.
The lower die body 31 and the upper die body 32 are symmetrically provided with longitudinal ribs 33 respectively, the lower die body 31 and the longitudinal ribs 33 of the upper die body 32 are connected through fasteners 34, so that a whole is formed in an assembling manner, additionally, two end faces of the outer die 30 in the length direction are also connected with a first end plate and a second end plate, the first end plate and the second end plate are both square, and reinforcing steel bar holes are uniformly arranged along the periphery, so that the longitudinal reinforcing steel bars 13 of the reinforcement cage 10 can conveniently penetrate out; additionally, the first end plate and the second end plate are also provided with bolt holes, so that the two end plates, the upper die body and the lower die body can be conveniently fixed through bolts. Preferably, be equipped with recess and arch on last die body and the lower die body contact surface, be equipped with the sealing strip in the recess to improve the sealed effect of going up die body and lower die body contact surface, as preferred, the groove width is not less than 20mm, and the degree of depth is not less than 15mm, and the distance of sealing strip apart from the contact surface is not more than 10 mm.
Preferably, the first end plate and/or the second end plate are/is further provided with holes with side lengths not smaller than 100mm, so that the second concrete material can be conveniently filled before the second centrifugation, and the excess material can be conveniently poured out.
Preferably, the fastener 34 includes the bolt, and upper die body and lower die body pass through the bolt fastening, and the bolt hole is arranged along the vertical rib, and adjacent bolt hole interval 400 ~ 600 mm.
Preferably, the inner die is in a strip structure, and the inner die can be specifically composed of a plurality of strip fillers, and the plurality of strip fillers are respectively filled in the reinforcement cage and are pulled out when the die is removed.
Preferably, the filler may include one of an inflatable air bag, a prestressed corrugated pipe, a glass fiber reinforced plastic pipe, a carbon fiber composite material pipe, a sanding belt or a batten, and the strip fillers with different diameters are selected according to the distance between the steel bars. The filler is preferably circular in cross-section.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method for manufacturing a hollow column is characterized by comprising the following steps:
s1: placing the reinforcement cage (10) fixed with the inner mold (20) in the outer mold (30);
s2: filling a first concrete material into the outer mould (30) and sealing the cavity of the outer mould (30);
s3: performing first centrifugation according to first preset parameters to form a concrete shell (41) from the first concrete material;
s4: standing the concrete casing (41) for A minutes, wherein A > 0;
s5: filling a second concrete material into the concrete shell (41);
s6: and carrying out second centrifugation according to second preset parameters so as to enable the second concrete material to be formed into a rough layer (42) embedded in the inner surface of the concrete shell (41).
2. The method for manufacturing a hollow column according to claim 1, wherein the step of S1: placing a reinforcement cage (10) fixed with an inner mold (20) in an outer mold (30), comprising:
s11: manufacturing the reinforcement cage (10);
s12: -placing said inner mould (20) inside said reinforcement cage (10);
s13: and placing the reinforcement cage (10) in a lower die body (31) of the outer die (30).
3. The method for manufacturing a hollow column according to claim 2, wherein the step of S2: filling a first concrete material into the outer mould (30) and closing the cavity of the outer mould (30), comprising:
s21: end plates are arranged on the end faces of the two ends of the outer die (30) in the length direction to form a groove-shaped accommodating cavity;
s22: filling the first concrete material into the groove-shaped accommodating cavity;
s23: an upper mold body (32) is mounted to close the cavity of the outer mold (30).
4. The method for manufacturing a hollow column according to claim 3, wherein the step of S3: first centrifuging according to first preset parameters to form a concrete shell (41) from a first concrete material, comprising:
s31: the rotation speed is 60-90 r/min, and the operation is 180-200 s;
s32: running for 60-90 s at the rotating speed of 120-160 r/min;
s33: operating at the rotating speed of 300-350 r/min for 120-150 s;
s34: running for 300-360 s at the rotating speed of 380-450 rpm;
s35: pouring out the residual slurry of the first concrete material;
wherein the total time from S31 to S34 is controlled within 9-12 min, and each 1m3The first concrete mass yields 0.04m3To 0.06m3And (4) residual slurry.
5. The method for manufacturing a hollow column according to claim 4, wherein the standing time A is 30-60 min.
6. The method for manufacturing a hollow column according to claim 5, wherein the step of S6: -second centrifuging according to second preset parameters to shape a second concrete material into a rough layer (42) embedded in the inner surface of said concrete shell (41), comprising:
s61: operating at the rotating speed of 60-90 r/min for 120-150 s;
s62: running for 60-90 s at the rotating speed of 120-160 r/min;
s63: the rotation speed is 300-350 r/min, and the operation lasts 180-240 s;
s64: pouring out the excess second concrete material;
wherein the total time from S61 to S63 is controlled within 6min to 8 min.
7. The method of making a hollow column of claim 6, further comprising: s7: curing the hollow column according to the curing parameters; the S7 specifically includes:
s71: standing for 1.5-2 h;
s72: heating at a speed of 20-25 ℃/h;
s73: keeping the temperature constant, controlling the constant temperature at 70 +/-5 ℃, keeping the temperature constant for 3-4.5 hours,
s74: and (5) cooling.
8. A method for making a hollow column according to any of claims 1 to 7, wherein the first concrete mass comprises: 320-390 parts of cement, 40-90 parts of mineral powder, 0-25 parts of anhydrite powder, 630-710 parts of sand, 1200-1300 parts of stone, 120-130 parts of water and 1.5-4.0 parts of a water reducing agent;
wherein the cement is portland cement with a strength grade of 42.5 or 52.5; the mineral powder is S95 grade, and the specific surface area is 420m 2/kg; the anhydrite powder has the specific surface area of 400m2/kg, the fineness of 200 meshes and the sieving rate of 0.80mm smaller than 0.1 percent; the fineness modulus of the sand is 2.5-3.0, and the mud content is not more than 3.0%; the stone is pebbles or broken stones, the particle size range is 5 mm-25 mm, and the mud content is not more than 1.0%; the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is not lower than 25%, and the content of chloride ions is not more than 0.6%.
9. A method for making a hollow column according to any of claims 4 to 7, wherein the second concrete mass comprises:
the first concrete material and the residual slurry of the first concrete material;
wherein the concentration of the cementing material of the first concrete material is 30-40%;
the mixing amount of the residual slurry of the first concrete material is 5-10% of the mass of the second concrete material;
the utilization time T of the residual slurry of the first concrete material is less than or equal to 20 min;
the utilization time of the residual slurry refers to the time interval from the end of the first centrifugation to the addition of the newly stirred first concrete material.
10. A hollow column preparation mold used in the hollow column production method according to any one of claims 1 to 9; the hollow column preparation mold comprises:
an outer mould (30) in which the reinforcement cage (10) is adapted to be placed;
the inner die (20) is fixedly connected with the reinforcement cage (10) and is suitable for forming a cavity with the outer die (30).
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| CN102211353A (en) * | 2011-05-26 | 2011-10-12 | 宿迁市固丰管桩有限公司 | Process for manufacturing centrifugal concrete pile |
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| CN110485636A (en) * | 2019-09-06 | 2019-11-22 | 三一筑工科技有限公司 | A kind of cavity frame column and its forming method |
| CN110733112A (en) * | 2019-11-25 | 2020-01-31 | 三一筑工科技有限公司 | Production method of cavity prefabricated part and inner die |
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| CN102211353A (en) * | 2011-05-26 | 2011-10-12 | 宿迁市固丰管桩有限公司 | Process for manufacturing centrifugal concrete pile |
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Application publication date: 20211105 |