CN111516096A - Precast column concrete pouring method in fabricated building - Google Patents
Precast column concrete pouring method in fabricated building Download PDFInfo
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- CN111516096A CN111516096A CN202010380072.9A CN202010380072A CN111516096A CN 111516096 A CN111516096 A CN 111516096A CN 202010380072 A CN202010380072 A CN 202010380072A CN 111516096 A CN111516096 A CN 111516096A
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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
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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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
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
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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
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to the technical field of assembly type buildings, and particularly discloses a method for pouring concrete of a precast column in an assembly type building, which specifically comprises the following steps: the method comprises the steps of site selection, template treatment, prefabricated column binding, embedded part installation, template installation, concrete pouring, light collection and maintenance treatment and template removal treatment. The invention adopts the oil-free isolating agent to coat the template, so that the isolating layer is formed on the inner surface of the template, thereby reducing the adhesive force of the template to concrete, reducing air bubbles between the concrete and the template when the concrete is poured, facilitating the demoulding of the template and the prefabricated column, avoiding the damage to the prefabricated column when the mould is demoulded, reducing the hole bubbles on the surface of the prefabricated column, improving the surface smoothness and demoulding efficiency of the prefabricated column, and adopting the temperature measuring device to carry out sectional monitoring on the concrete poured in the prefabricated column in the pouring process, and avoiding the influence on the quality of the concrete caused by larger temperature difference between the inside and the outside.
Description
Technical Field
The invention relates to a large range, in particular to a precast column concrete pouring method in an assembly type building.
Background
With the rapid development of modern industrial science and technology, the house can be standardized and manufactured in batches. The prefabricated standard house finished components are transported to a construction site to be assembled to form a complete building, the building is called an assembled building, the prefabricated concrete is formed by binding and pouring reinforcing steel bars of structural columns in a factory, the bottom of each column is connected with the reinforcing steel bars reserved on a floor slab in a grouting mode through reserved holes, and meanwhile, the reinforcing steel bars are reserved at the top and connected with components such as plates and beams in a grouting or overlapping mode.
Chinese patent discloses a precast column concrete pouring method in an assembly type building (No. CN 108638322B), which can better control the appearance and quality of a precast column finished product and ensure the quality and mass production efficiency of the precast column finished product after pouring, but when the concrete is poured into the precast column in the above patent and the precast column in the existing market, because the contact surface between the template and the concrete is not perfectly processed, the template and the concrete are easily adhered to each other, when the prefabricated column is demoulded, the surface of the precast column is easily damaged, although the demoulding agent is adopted to coat the template for isolation, the existing isolating agent or demoulding agent still easily causes bubbles or water bubbles to be generated on the concrete interface when the template is contacted with the concrete after coating, so that after demoulding, more holes appear on the surface of the precast column to influence the appearance, in addition, in the process of pouring the precast columns, after concrete enters the mold, workers cannot constantly monitor the temperature of the concrete entering the mold, internal and external temperature deviation of the concrete entering the mold is easily caused, and the quality of the concrete can be affected if the internal and external temperature deviation cannot be timely processed. Accordingly, those skilled in the art have provided a precast column concrete casting method in a fabricated building to solve the problems set forth in the background art as described above.
Disclosure of Invention
The invention aims to provide a method for pouring concrete of a precast column in an assembly type building, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a precast column concrete pouring method in an assembly type building specifically comprises the following steps:
A. site selection: selecting a ground where the foundation is compacted, and tamping and flattening by using a flattening machine to ensure that the deviation of the surface flatness of the ground is +/-20 mm;
B. template treatment: cleaning the surface of the template to ensure the surface smoothness, then coating a release agent on the surface of the template, and respectively forming temperature measuring holes in the upper, middle and lower parts of the surface of the template;
C. binding the prefabricated columns: firstly, a bottom formwork is placed on the ground, a central line is popped out of the bottom formwork before reinforcing bars, main reinforcing bars of a prefabricated column are placed, then a certain number of stirrups are uniformly distributed and sleeved on the main reinforcing bars, and the stirrups are moved to a binding position, so that the main reinforcing bars are bound in a winding mode, and after the binding is finished, the joints of the stirrups and the main reinforcing bars need to be subjected to interval electric welding reinforcement;
D. installing an embedded part: reserving the position of a hoisting point according to the design of a drawing, simultaneously popping a center line of an embedded part at the top of the column in advance, aligning the center line with the center line popped out of the bottom template, fixing the embedded part, and tightly connecting the embedded part with the steel bars of the precast column in a welding mode after determining the correct number, position and direction of the embedded part;
E. installing a template: after the prefabricated column is bound and molded, the processed side template and the bottom template are connected and fixed, so that the bound prefabricated column is subjected to four-side formwork supporting fixation, the prefabricated column is in contact with the templates, then the temperature measuring tubes are respectively inserted into the prefabricated column through the temperature measuring holes, and gaps between the temperature measuring tubes and the temperature measuring holes are blocked by cotton slivers.
F. Pouring concrete: pouring concrete on the prefabricated column from the space between the templates on the two sides, and inserting a concrete vibrator for vibrating, wherein the templates, the steel bar embedded parts and the temperature measuring pipes are prevented from being collided as much as possible during vibrating;
G. and (3) light receiving and curing treatment: after the pouring is finished, the pouring surface needs to be leveled and polished, the defects are filled by the same materials, the surface size of the component is corrected by strictly forbidding a mortar method, a cotton blanket or a grass curtain is covered on the prefabricated component after the pouring is finished for heat preservation, and watering and maintenance are carried out;
H. removing the mold: and after the prefabricated column reaches the form removal strength, sequentially removing the templates, manually removing and repairing redundant protruding interfaces on the prefabricated column to ensure the surface smoothness of the prefabricated column, coating a curing agent on the surface of the prefabricated column to form a protective film on the surface of the prefabricated column to prevent water from evaporating, and achieving the purpose of curing.
As a further scheme of the invention: the separant comprises the following components in parts by weight: 10-15 parts of talcum powder, 1-3 parts of triethanolamine, 30-50 parts of rosin, 5-10 parts of soap powder and 30-50 parts of water.
As a still further scheme of the invention: the preparation method of the separant comprises the following steps: pulverizing Colophonium into powder, placing into a stirring tank, sequentially adding pulvis Talci, triethanolamine, soap powder and water, keeping temperature at 50-70 deg.C, and stirring for 30min to obtain separant.
As a still further scheme of the invention: one end of the temperature measuring pipe is connected with a temperature alarm device for constantly monitoring the temperature of the mixed soil after entering the mold and giving an alarm in time.
As a still further scheme of the invention: installing conditions of the embedded part: and the hoisting point adopts a thick and thin steel pipe as a reserved hole, and the contact part of the embedded part and the template is pasted with a sealing rubber strip with the thickness of 2mm around the embedded part so as to ensure that the embedded part can be completely leaked after the template is removed.
As a still further scheme of the invention: concrete pouring conditions are as follows: before pouring, dirt on a template, a reinforcing steel bar and an iron piece is removed, the prefabricated column is poured once without allowing a construction joint to be left, and the prefabricated column is pushed from one end to the other end of the prefabricated column during pouring.
As a still further scheme of the invention: and (3) vibrating conditions: the concrete vibrator adopts an inserted vibrator, the distance of the moving position of a vibrating rod during vibration is not more than 1.5 times of the acting radius of the vibrating rod, the moving distance is 30-40cm, and the vibration is stopped until the concrete does not sink any more and the surface of the concrete has laitance.
As a still further scheme of the invention: and (3) maintenance conditions: covering thickness of the cotton blanket is not less than 3cm, maintaining time is not less than 7 days, watering is carried out twice a day at normal temperature, and stripping conditions are as follows: when the template is dismantled, the template is required to be dismantled from one direction without being pried, and the template is inspected and cleaned after being dismantled and reused after being brushed with a separant.
As a still further scheme of the invention: the curing agent comprises the following components in parts by weight: 20-30 parts of wax emulsion, 3-5 parts of diethylene glycol monoethyl ether, 1-3 parts of sodium silicate and 0.1-1 part of accelerator, and the preparation method comprises the following steps: respectively putting a certain amount of wax emulsion, diethylene glycol monoethyl ether and sodium silicate into a stirring tank, stirring and mixing, adding a certain amount of water, and stirring uniformly to obtain the curing agent.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a precast column concrete pouring method in an assembly type building, which is characterized in that during actual operation, an oil-free manufactured isolating agent is coated on a template to form an isolating layer on the inner surface of the template, so that the adhesion of the template to concrete is reduced, air bubbles between the concrete and the template are reduced during concrete pouring, hole bubbles on a precast column surface after demolding are avoided, demolding of the template and a precast column is facilitated, damage to the precast column during demolding due to high adhesion of the template and the precast column is avoided, the precast column is not easily stained on a steel bar of the precast column, the surface of the concrete is not stained and influenced, the surface smoothness and demolding efficiency of the precast column surface are further improved, and a temperature measuring device is adopted to perform sectional monitoring on the concrete poured in the precast column during pouring, the temperature of the concrete after entering the mold is monitored constantly, and if the temperature difference is large, an alarm is given out in time, so that the workers can take measures in time, and the influence on the quality of the concrete caused by the large temperature difference inside and outside the concrete is avoided.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, the concrete pouring method for the prefabricated column in the fabricated building specifically comprises the following steps:
A. site selection: selecting a ground where the foundation is compacted, and tamping and flattening by using a flattening machine to ensure that the deviation of the surface flatness of the ground is +/-20 mm;
B. template treatment: the surface of the template is cleaned and brushed to ensure the smoothness of the surface, and then a release agent is coated on the surface of the template, wherein the release agent comprises the following components in parts by weight: 10-15 parts of talcum powder, 1-3 parts of triethanolamine, 30-50 parts of rosin, 5-10 parts of soap powder and 30-50 parts of water, and the preparation method comprises the following steps: pulverizing Colophonium into powder, placing into a stirring tank, sequentially adding pulvis Talci, triethanolamine, soap powder and water, keeping temperature at 50-70 deg.C, and stirring for 30min to obtain separant;
during the concrete pouring of the prefabricated column, more hole bubbles often appear on the surface of the formed prefabricated column, and the hole bubbles are generated because the water bubbles and the bubbles are left on the interface between the template and the concrete, so that the application of the isolating agent on the template is good and bad, and the isolating agent is one of direct reasons for forming the hole bubbles; therefore, the release agent adopted by the invention is compared with the existing concrete release agent (namely, release agent) on the market in an experiment, and the experimental conditions are as follows: selecting two metal test templates with the length of 4m multiplied by the width of 4m multiplied by the thickness of 5cm, respectively coating the existing separant and the separant of the invention on the two test templates, then laying the concrete on the test templates coated with the separant, observing the number and the diameter of pores on the surface of the concrete with the diameter of more than 3mm after the concrete is molded and demoulded, and calculating the pore foam rate, wherein the specific data are shown in the following table;
therefore, the isolating agent disclosed by the invention is used for coating the inner surface of the template to form an isolating layer on the inner surface of the template, so that the adhesion of the template to concrete is reduced, bubbles between the concrete and the template are reduced when the concrete is poured, the template and a prefabricated column are convenient to demould, the damage to the prefabricated column caused by demoulding due to the large adhesion of the template and the prefabricated column is avoided, the isolating agent is made oil-free, the isolating agent is not easy to be adhered to steel bars of the prefabricated column during coating, and the surface of the concrete is not adhered, so that the surface smoothness and the demoulding efficiency of the prefabricated column are further improved.
Temperature measuring holes are respectively formed in the upper, middle and lower parts of the surface of the template, one end of each temperature measuring pipe is connected with a temperature alarm device, the temperature alarm device is set with a specified highest temperature value and a specified lowest temperature value, the temperature after concrete is poured into the mold is constantly monitored by the temperature measuring pipes, if the temperature deviation after the concrete in the precast column is poured into the mold is large, an alarm can be given in time, workers can take measures in time, and the measures can be taken to reduce the initial temperature of the concrete because the concrete with a large volume structure or high anti-cracking requirement concrete has a large difference between the internal temperature and the external temperature of the concrete poured in the precast column, so that the performance of the concrete is not influenced;
C. binding the prefabricated columns: firstly, a bottom formwork is placed on the ground, a central line is popped out of the bottom formwork before reinforcing bars are bound, main reinforcing bars of a prefabricated column are placed, then a certain number of stirrups are uniformly distributed and sleeved on the main reinforcing bars, and the stirrups are moved to binding positions, so that the main reinforcing bars are bound in a winding mode, and after the binding is completed, the joints of the stirrups and the main reinforcing bars need to be subjected to interval electric welding reinforcement, so that the firmness between the main reinforcing bars and the stirrups is ensured, and the stirrups are prevented from moving when pouring and vibrating, so that the structure of the prefabricated column is influenced;
D. installing an embedded part: reserving the position of a hoisting point according to the design of a drawing, simultaneously popping a center line of an embedded part at the top of a column in advance, aligning the center line with the center line popped out of a bottom template, fixing the embedded part, determining the correct number, position and direction of the embedded part, and tightly connecting the embedded part with a steel bar of a precast column in a welding mode, wherein the hoisting point adopts a thick and thin steel pipe as a reserved hole, and a sealing rubber strip with the thickness of 2mm is adhered around the embedded part at the contact part of the embedded part and the template so as to ensure that the embedded part can be completely leaked after the template is removed;
E. installing a template: after the prefabricated column is bound and molded, the processed side template and the bottom template are connected and fixed, so that the bound prefabricated column is subjected to four-side formwork supporting fixation, the prefabricated column is in contact with the templates, then the temperature measuring tubes are respectively inserted into the prefabricated column through the temperature measuring holes, and gaps between the temperature measuring tubes and the temperature measuring holes are blocked by cotton slivers.
F. Pouring concrete: pouring concrete on the prefabricated column from a space between two side formworks, before pouring, removing dirt on the formworks, reinforcing steel bars and iron parts, pouring once, and not allowing to leave a construction joint, pushing the prefabricated column from one end to the other end when pouring, simultaneously inserting a concrete vibrator for vibration treatment, and avoiding colliding the formworks, the reinforcing steel bar embedded parts and the temperature measuring pipe as far as possible when vibrating, wherein the concrete vibrator adopts an inserted vibrator, the distance of the moving position of the vibrator is not more than 1.5 times of the acting radius of the vibrator during vibration, the moving distance is 30-40cm, and the vibration is stopped when the concrete is vibrated until the concrete does not sink any more and laitance appears on the surface;
G. and (3) light receiving and curing treatment: after pouring is finished, the pouring surface needs to be leveled and polished, the defects are filled by the same materials, the surface size of the component is corrected by strictly forbidding a mortar method, a prefabricated component which is poured is covered with a cotton blanket or a grass curtain for heat preservation, and is watered and maintained, wherein the covering thickness of the cotton blanket is not less than 3cm, the maintenance time is not less than 7 days, and watering is carried out twice a day at normal temperature;
H. removing the mold: after the prefabricated column reaches the form removal intensity, demolish the template in proper order, when the template is demolished, must begin by a direction, can not prize in disorder, demolish the back inspection clearance, reuse after brushing the isolating agent to carry out artifical rejection restoration to unnecessary outstanding interface on the prefabricated column, ensure the smooth finish on prefabricated column surface, then brush the curing agent on its surface, form the protection film on prefabricated column surface, prevent the evaporation of water, reach the purpose of maintenance, and the curing agent is divided into according to the part by weight: 20-30 parts of wax emulsion, 3-5 parts of diethylene glycol monoethyl ether, 1-3 parts of sodium silicate and 0.1-1 part of accelerator, and the preparation method comprises the following steps: a certain amount of wax emulsion, diethylene glycol monoethyl ether and sodium silicate are respectively put into a stirring tank to be stirred and mixed, a certain amount of water is added until the mixture is uniformly stirred, and then the curing agent can be prepared.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A precast column concrete pouring method in an assembly type building is characterized by comprising the following steps:
A. site selection: selecting a ground where the foundation is compacted, and tamping and flattening by using a flattening machine to ensure that the deviation of the surface flatness of the ground is +/-20 mm;
B. template treatment: cleaning the surface of the template to ensure the surface smoothness, then coating a release agent on the surface of the template, and respectively forming temperature measuring holes in the upper, middle and lower parts of the surface of the template;
C. binding the prefabricated columns: firstly, a bottom formwork is placed on the ground, a central line is popped out of the bottom formwork before reinforcing bars, main reinforcing bars of a prefabricated column are placed, then a certain number of stirrups are uniformly distributed and sleeved on the main reinforcing bars, and the stirrups are moved to a binding position, so that the main reinforcing bars are bound in a winding mode, and after the binding is finished, the joints of the stirrups and the main reinforcing bars need to be subjected to interval electric welding reinforcement;
D. installing an embedded part: reserving the position of a hoisting point according to the design of a drawing, simultaneously popping a center line of an embedded part at the top of the column in advance, aligning the embedded part with the center line popped out of the bottom template, fixing the embedded part, and tightly connecting the embedded part with the steel bars of the prefabricated column in a welding mode after determining the correct number, position and direction of the embedded part;
E. installing a template: after the prefabricated column is bound and molded, the processed side template and the bottom template are connected and fixed, so that the bound prefabricated column is subjected to four-side formwork supporting fixation, the prefabricated column is in contact with the templates, then the temperature measuring tubes are respectively inserted into the prefabricated column through the temperature measuring holes, and gaps between the temperature measuring tubes and the temperature measuring holes are blocked by cotton slivers.
F. Pouring concrete: pouring concrete on the prefabricated column from the space between the templates on the two sides, and simultaneously inserting a concrete vibrator for vibration treatment, wherein the templates, the steel bar embedded parts and the temperature measuring pipes are prevented from being collided as much as possible during vibration;
G. and (3) light receiving and curing treatment: after the pouring is finished, the pouring surface needs to be leveled and polished, the defects are filled by the same materials, the surface size of the component is corrected by strictly forbidding a mortar method, a cotton blanket or a grass curtain is covered on the prefabricated component after the pouring is finished for heat preservation, and watering and maintenance are carried out;
H. removing the mold: and after the prefabricated column reaches the form removal strength, sequentially removing the templates, manually removing and repairing redundant protruding interfaces on the prefabricated column to ensure the surface smoothness of the prefabricated column, coating a curing agent on the surface of the prefabricated column to form a protective film on the surface of the prefabricated column to prevent water from evaporating, and achieving the purpose of curing.
2. The precast column concrete pouring method in the fabricated building according to claim 1, wherein the separant comprises the following components in parts by weight: 10-15 parts of talcum powder, 1-3 parts of triethanolamine, 30-50 parts of rosin, 5-10 parts of soap powder and 30-50 parts of water.
3. The precast column concrete pouring method in the fabricated building according to claim 2, wherein the release agent is prepared by: pulverizing Colophonium into powder, placing into stirring tank, sequentially adding pulvis Talci, triethanolamine, soap powder and water, keeping temperature at 50-70 deg.C, and stirring for 30min to obtain separant.
4. The precast column concrete pouring method in an assembly type building according to claim 1, wherein a temperature alarm device is connected to one end of the temperature measuring pipe for constantly monitoring the temperature of the concrete after the concrete is poured into the mold and giving an alarm in time.
5. The precast column concrete pouring method in an assembly type building according to claim 1, wherein the embedment installation conditions are as follows: and the hoisting point adopts a thick and thin steel pipe as a reserved hole, and the contact part of the embedded part and the template is adhered with a sealing rubber strip with the thickness of 2mm around the embedded part so as to ensure that the embedded part can be completely leaked after the template is removed.
6. The precast column concrete pouring method in an assembly type building according to claim 1, wherein the concrete pouring conditions are: before pouring, dirt on a template, a reinforcing steel bar and an iron piece is removed, the prefabricated column is poured once without allowing a construction joint to be left, and the prefabricated column is pushed from one end to the other end of the prefabricated column during pouring.
7. The precast column concrete pouring method in an assembly type building according to claim 1, wherein the vibrating condition is: the concrete vibrator adopts an inserted vibrator, the distance of the moving position of a vibrating rod is not more than 1.5 times of the action radius of the vibrating rod during vibration, the moving distance is 30-40cm, and the vibration is stopped until the concrete does not sink any more and the surface of the concrete has laitance.
8. The precast column concrete pouring method in an assembly type building according to claim 1, wherein the curing condition is: covering the cotton blanket to be not less than 3cm in thickness, maintaining for not less than 7 days, watering twice a day at normal temperature, and removing the mould: when the template is dismantled, the template is required to be dismantled from one direction without being pried, and the template is inspected and cleaned after being dismantled and reused after being brushed with a separant.
9. The precast column concrete pouring method in an assembly type building according to claim 1, wherein the curing agent comprises the following components in parts by weight: 20-30 parts of wax emulsion, 3-5 parts of diethylene glycol monoethyl ether, 1-3 parts of sodium silicate and 0.1-1 part of accelerator, and the preparation method comprises the following steps: respectively putting a certain amount of wax emulsion, diethylene glycol monoethyl ether and sodium silicate into a stirring tank, stirring and mixing, adding a certain amount of water, and stirring uniformly to obtain the curing agent.
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| CN112976268A (en) * | 2021-01-18 | 2021-06-18 | 贵州老福节能环保工程材料科技有限公司 | Column prefabricating process and prefabricating device thereof |
| CN113001740A (en) * | 2021-03-10 | 2021-06-22 | 郑昆颖 | Production process of brand-new precast concrete member |
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| CN110682433A (en) * | 2019-10-09 | 2020-01-14 | 南通创为机械科技有限公司 | Prefabricated stand column construction scheme |
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