CN112922005A - Construction method of large-volume building foundation - Google Patents
Construction method of large-volume building foundation Download PDFInfo
- Publication number
- CN112922005A CN112922005A CN202110115500.XA CN202110115500A CN112922005A CN 112922005 A CN112922005 A CN 112922005A CN 202110115500 A CN202110115500 A CN 202110115500A CN 112922005 A CN112922005 A CN 112922005A
- Authority
- CN
- China
- Prior art keywords
- concrete
- foundation
- template
- construction method
- reinforcement cage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Foundations (AREA)
Abstract
The invention discloses a construction method of a large-volume building foundation, which comprises the following steps: step 1: the template that will basic pouring needs carries out fixed support through the bracing piece, and the basic template is fixed firmly through outside bearing structure, and the template of perpendicular position sets for certain prestressing force variation range, ensures that basic concrete pouring shaping size satisfies the design requirement. Has the advantages that: according to the construction method for preserving heat through the heat preservation pad and the heat preservation film, the construction method of the large-volume building foundation is improved, when construction is carried out in a low-temperature environment, the outer layer of the concrete foundation of the building is isolated from the external low-temperature environment through the heat preservation pad and the heat preservation film, the concrete is prevented from being propped open due to freezing of moisture in the concrete, further, cracks are prevented from appearing on the outer layer of the foundation, and the forming quality of the foundation is guaranteed.
Description
Technical Field
The invention relates to the field of foundation construction methods for large-volume buildings, in particular to a foundation construction method for large-volume buildings.
Background
The foundation refers to a bearing structure below the ground of a building, such as a foundation pit, a bearing platform, a frame column, a ground beam and the like. Is an enlarged part of the wall or column of the building in the ground, which is used to bear the load transferred from the superstructure of the building and transfer them to the foundation together with the self-weight.
The modern buildings often involve mass concrete construction, such as high-rise building foundations, large equipment foundations, water conservancy dams and the like. It is mainly characterized by large volume, and the size of any direction of the minimum section is at least 0.8 m. Its surface coefficient is smaller, the cement hydration heat release is more concentrated, and its internal temp. rise is faster. When the temperature difference between the inside and the outside of the concrete is large, the concrete can generate temperature cracks, and the structural safety and normal use are influenced.
When the existing large-size building foundation construction method is used for construction under the condition of meeting a low-temperature environment, the outer layer of a concrete foundation of a building is in contact with the external low-temperature environment, the concrete is easy to freeze before solidification, and the concrete is easy to prop open after moisture in the concrete is frozen, so that the outer layer of the foundation is cracked, and therefore a novel production and preparation method is needed to solve the existing problems.
Disclosure of Invention
The present invention is directed to a method for constructing a large-sized building foundation.
The invention realizes the purpose through the following technical scheme:
a construction method of a large-volume building foundation comprises the following steps:
(1) supporting a foundation formwork:
step 1: the template required by the foundation pouring is fixedly supported through the support rods, the foundation template is firmly fixed through the external support structure, and the template at the vertical part is set to have a certain prestress change range, so that the pouring and forming size of the foundation concrete is ensured to meet the design requirement;
step 2: cleaning the inner side surface of the basic template, and checking that the gap width of the template lap joint gap position is lower than a set value to ensure that concrete does not leak;
(2) binding and fixing a reinforcement cage:
step 1: pre-binding a reinforcement cage in a reinforcement processing field, hoisting the bound reinforcement cage to the inner side of a foundation template, accurately positioning the placement position of the reinforcement cage through a positioning device, binding a used pre-embedded cooling pipe at the set position of the reinforcement cage, wherein the water inlet of the cooling pipe is 0.5 m higher than the top surface of foundation concrete, the water inlet of the cooling pipe is provided with a valve, and the water outlet of the cooling pipe is arranged 0.3 m lower than the lowest horizontal plane of the foundation template;
step 2: after the reinforcement cage is bound and fixed, a positioning elevation is arranged on the reinforcement cage, positioning elevation rods are arranged on the reinforcement cage at equal intervals according to the specification, and the positioning elevation rods are painted with red paint for marking;
(3) template cleaning and release agent coating:
step 1: distinguishing a wood template and a steel template, cleaning the inner side surfaces of the wood template and the steel template, removing concrete residues on the surface layer of the template, and blocking the joint position of the template in time;
step 2: fully wetting the wood template by using clean water to ensure the humidity of the wood template, uniformly spraying a separant on the surface layer of the steel template through a spray can, and spraying the separant more than three times at the crack position of the steel template;
(4) concrete is poured in layers:
step 1: reporting the required concrete cubic quantity to the concrete in advance according to the calculated basic volume quantity
The mixing station calculates the pouring speed according to the number of operators and the number of pump trucks for pouring the foundation concrete, and reasonably arranges the arrival interval and the arrival speed of the concrete tank truck;
step 2: the pump truck is parked at a reasonable position, the operation range of a cantilever rod of the pump truck is ensured to cover the whole foundation plane, concrete is pumped to a foundation template through the pump truck, an operator uniformly flattens concrete materials, and the operator is matched with a vibrating rod to vibrate the concrete in time;
and step 3: after each pouring layer is finished, sleeving a protection pipe on the temperature measuring sensor, vertically inserting the temperature measuring sensor into the poured concrete layer, vertically and equidistantly placing the temperature measuring sensor, and enabling the length of the protection pipe to exceed the height of the foundation by 0.5 m;
and 4, step 4: after the layered concrete is poured, the concrete surface layer is vibrated and flattened through vibration compaction equipment, then cement powder is uniformly spread on the concrete surface layer, the foundation surface is ground flat through a polishing device, heat insulation pads are covered on the peripheral side wall and the top side of the concrete foundation after the foundation surface is ground flat, and transparent heat insulation films are covered outside the heat insulation pads.
Furthermore, the inner diameter of the embedded cooling pipe is 5-10 cm, the embedded cooling pipe is made of aluminum alloy, the outer side wall of the embedded cooling pipe is coated with an isolating agent layer, and the inner diameter of the protective pipe is 2 cm.
Furthermore, the protection tube inside wall integrated into one piece has the temperature measurement sensor fixed plate, the temperature measurement sensor with the protection tube passes through bolted connection, the water inlet and the delivery port of cooling tube pass through pipeline and outside cooling water tank and circulating pump UNICOM, the cooling tube outside wall coating isolating agent, vertically the cooling tube is with the level the cooling tube passes through threaded connection.
Furthermore, cooling water is poured into the cooling pipes 48 hours after the concrete is poured, the cooling pipes are vertically arranged in a crossed mode at intervals in the concrete layer poured in a layered mode, and the side length of each grid formed in a crossed mode is 1.5 m.
Furthermore, the thickness of the heat-insulating pad is 10 cm, the heat-insulating pad is formed by weaving reed grass, the heat-insulating film is made of plastic, and the heat-insulating pads are bound and connected through ropes.
The invention has the beneficial effects that:
according to the construction method for preserving heat through the heat preservation pad and the heat preservation film, the construction method of the large-volume building foundation is improved, when construction is carried out in a low-temperature environment, the outer layer of the concrete foundation of the building is isolated from the external low-temperature environment through the heat preservation pad and the heat preservation film, the concrete is prevented from being propped open due to freezing of moisture in the concrete, further, cracks are prevented from appearing on the outer layer of the foundation, and the forming quality of the foundation is guaranteed.
Drawings
Fig. 1 is a construction drawing of a construction method of a large-volume building foundation according to the present invention.
In the figure: 1. protecting the sleeve; 2. a concrete foundation; 3. a base template; 4. a cooling tube; 5. a heat-insulating pad; 6. and (5) a heat preservation film.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
a construction method of a large-volume building foundation comprises the following steps:
(1) supporting a foundation formwork:
step 1: the template required by the foundation pouring is fixedly supported through the support rods, the foundation template is firmly fixed through the external support structure, and the template at the vertical part is set to have a certain prestress change range, so that the pouring and forming size of the foundation concrete is ensured to meet the design requirement;
step 2: cleaning the inner side surface of the basic template, and checking that the gap width of the template lap joint gap position is lower than a set value to ensure that concrete does not leak;
(2) binding and fixing a reinforcement cage:
step 1: pre-binding a reinforcement cage in a reinforcement processing field, hoisting the bound reinforcement cage to the inner side of a foundation template, accurately positioning the placement position of the reinforcement cage through a positioning device, binding a used pre-embedded cooling pipe at the set position of the reinforcement cage, wherein the water inlet of the cooling pipe is 0.5 m higher than the top surface of foundation concrete, the water inlet of the cooling pipe is provided with a valve, and the water outlet of the cooling pipe is arranged 0.3 m lower than the lowest horizontal plane of the foundation template;
step 2: after the reinforcement cage is bound and fixed, a positioning elevation is arranged on the reinforcement cage, positioning elevation rods are arranged on the reinforcement cage at equal intervals according to the specification, and the positioning elevation rods are painted with red paint for marking;
(3) template cleaning and release agent coating:
step 1: distinguishing a wood template and a steel template, cleaning the inner side surfaces of the wood template and the steel template, removing concrete residues on the surface layer of the template, and blocking the joint position of the template in time;
step 2: fully wetting the wood template by using clean water to ensure the humidity of the wood template, uniformly spraying a separant on the surface layer of the steel template through a spray can, and spraying the separant more than three times at the crack position of the steel template;
(4) concrete is poured in layers:
step 1: reporting the required concrete cubic quantity to the concrete in advance according to the calculated basic volume quantity
The mixing station calculates the pouring speed according to the number of operators and the number of pump trucks for pouring the foundation concrete, and reasonably arranges the arrival interval and the arrival speed of the concrete tank truck;
step 2: the pump truck is parked at a reasonable position, the operation range of a cantilever rod of the pump truck is ensured to cover the whole foundation plane, concrete is pumped to a foundation template through the pump truck, an operator uniformly flattens concrete materials, and the operator is matched with a vibrating rod to vibrate the concrete in time;
and step 3: after each pouring layer is finished, sleeving a protection pipe on the temperature measuring sensor, vertically inserting the temperature measuring sensor into the poured concrete layer, vertically and equidistantly placing the temperature measuring sensor, and enabling the length of the protection pipe to exceed the height of the foundation by 0.5 m;
and 4, step 4: after the layered concrete is poured, the concrete surface layer is vibrated and flattened through vibration compaction equipment, then cement powder is uniformly spread on the concrete surface layer, the foundation surface is ground flat through a polishing device, heat insulation pads are covered on the peripheral side wall and the top side of the concrete foundation after the foundation surface is ground flat, and transparent heat insulation films are covered outside the heat insulation pads.
In the embodiment, the inner diameter of the embedded cooling pipe is 5-10 cm, the embedded cooling pipe is made of aluminum alloy, the outer side wall of the embedded cooling pipe is coated with an isolating agent layer, and the inner diameter of the protective pipe is 2 cm.
In this embodiment, protection tube inside wall integrated into one piece has the temperature measurement sensor fixed plate, the temperature measurement sensor with the protection tube passes through bolted connection, the water inlet and the delivery port of cooling tube pass through pipeline and outside cooling water tank and circulating pump UNICOM, the cooling tube outside wall coating isolating agent, vertically the cooling tube is with the horizontally the cooling tube passes through threaded connection.
In the embodiment, the cooling pipes are filled with cooling water 48 hours after the concrete is poured, the cooling pipes are vertically arranged in a crossed manner at intervals in the concrete layer poured in a layered manner, and the side length of each square formed by the crossed square grids is 1.5 meters.
In the embodiment, the thickness of the heat preservation pad is 10 cm, the heat preservation pad is formed by weaving reed grass, the heat preservation film is made of plastic, and the heat preservation pads are bound and connected through ropes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A construction method of a large-volume building foundation is characterized by comprising the following steps: it comprises the following steps:
(1) supporting a foundation formwork:
step 1: the template required by the foundation pouring is fixedly supported through the support rods, the foundation template is firmly fixed through the external support structure, and the template at the vertical part is set to have a certain prestress change range, so that the pouring and forming size of the foundation concrete is ensured to meet the design requirement;
step 2: cleaning the inner side surface of the basic template, and checking that the gap width of the template lap joint gap position is lower than a set value to ensure that concrete does not leak;
(2) binding and fixing a reinforcement cage:
step 1: pre-binding a reinforcement cage in a reinforcement processing field, hoisting the bound reinforcement cage to the inner side of a foundation template, accurately positioning the placement position of the reinforcement cage through a positioning device, binding a used pre-embedded cooling pipe at the set position of the reinforcement cage, wherein the water inlet of the cooling pipe is 0.5 m higher than the top surface of foundation concrete, the water inlet of the cooling pipe is provided with a valve, and the water outlet of the cooling pipe is arranged 0.3 m lower than the lowest horizontal plane of the foundation template;
step 2: after the reinforcement cage is bound and fixed, a positioning elevation is arranged on the reinforcement cage, positioning elevation rods are arranged on the reinforcement cage at equal intervals according to the specification, and the positioning elevation rods are painted with red paint for marking;
(3) template cleaning and release agent coating:
step 1: distinguishing a wood template and a steel template, cleaning the inner side surfaces of the wood template and the steel template, removing concrete residues on the surface layer of the template, and blocking the joint position of the template in time;
step 2: fully wetting the wood template by using clean water to ensure the humidity of the wood template, uniformly spraying a separant on the surface layer of the steel template through a spray can, and spraying the separant more than three times at the crack position of the steel template;
(4) concrete is poured in layers:
step 1: reporting the required concrete cubic quantity to a concrete mixing plant in advance according to the calculated foundation volume, calculating the pouring speed according to the number of operators for pouring the foundation concrete and the number of pump trucks, and reasonably arranging the arrival interval and the speed of a concrete tank truck;
step 2: the pump truck is parked at a reasonable position, the operation range of a cantilever rod of the pump truck is ensured to cover the whole foundation plane, concrete is pumped to a foundation template through the pump truck, an operator uniformly flattens concrete materials, and the operator is matched with a vibrating rod to vibrate the concrete in time;
and step 3: after each pouring layer is finished, sleeving a protection pipe on the temperature measuring sensor, vertically inserting the temperature measuring sensor into the poured concrete layer, vertically and equidistantly placing the temperature measuring sensor, and enabling the length of the protection pipe to exceed the height of the foundation by 0.5 m;
and 4, step 4: after the layered concrete is poured, the concrete surface layer is vibrated and flattened through vibration compaction equipment, then cement powder is uniformly spread on the concrete surface layer, the foundation surface is ground flat through a polishing device, heat insulation pads are covered on the peripheral side wall and the top side of the concrete foundation after the foundation surface is ground flat, and transparent heat insulation films are covered outside the heat insulation pads.
2. A construction method of a large-volume building foundation according to claim 1, wherein: the inner diameter of the embedded cooling pipe is 5-10 cm, the embedded cooling pipe is made of aluminum alloy, the outer side wall of the embedded cooling pipe is coated with an isolating agent layer, and the inner diameter of the protective pipe is 2 cm.
3. A construction method of a large-volume building foundation according to claim 1, wherein: the utility model discloses a temperature measurement sensor, including protection tube, temperature measurement sensor, cooling tube, temperature measurement sensor, protection tube inside wall integrated into one piece have the temperature measurement sensor fixed plate, temperature measurement sensor with the protection tube passes through bolted connection, the water inlet and the delivery port of cooling tube pass through pipeline and outside cooling water tank and circulating pump UNICOM, the cooling tube outside wall coating isolating agent, vertically cooling tube and horizontally the cooling tube passes through threaded connection.
4. A construction method of a large-volume building foundation according to claim 1, wherein: and the cooling pipes are filled with cooling water 48 hours after the concrete is poured, the cooling pipes are vertically arranged in a crossed manner at intervals in the concrete layer poured in a layered manner, and the side length of each grid formed by the crossed manner is 1.5 meters.
5. A construction method of a large-volume building foundation according to claim 1, wherein: the thickness of the heat preservation pad is 10 centimeters, the heat preservation pad is formed by weaving reed grass, the protective film is made of plastic, and the heat preservation pads are connected through binding of ropes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115500.XA CN112922005A (en) | 2021-01-28 | 2021-01-28 | Construction method of large-volume building foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115500.XA CN112922005A (en) | 2021-01-28 | 2021-01-28 | Construction method of large-volume building foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112922005A true CN112922005A (en) | 2021-06-08 |
Family
ID=76167420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110115500.XA Pending CN112922005A (en) | 2021-01-28 | 2021-01-28 | Construction method of large-volume building foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112922005A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180746A (en) * | 2022-09-07 | 2023-05-30 | 中国化学工程第六建设有限公司 | Large-volume concrete construction process capable of effectively preventing concrete from shrinking in temperature |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888317A (en) * | 2006-07-31 | 2007-01-03 | 潘英豪 | Illuminating light reflective concrete curb and producing method thereof |
| CN202994333U (en) * | 2012-12-18 | 2013-06-12 | 中国新兴保信建设总公司 | Double-deck PVC concrete temperature measurement tube |
| CN104790666A (en) * | 2015-04-13 | 2015-07-22 | 中冶建工集团有限公司 | Frost damage prevention method for cast-in-place concrete beams and slabs |
| CN105525616A (en) * | 2014-10-26 | 2016-04-27 | 王丰利 | Massive concrete pouring method |
| JP2017166279A (en) * | 2016-03-18 | 2017-09-21 | 前田建設工業株式会社 | Heat-retaining mat for concrete, concrete placing form with heat-retaining mat, heat-retaining method for concrete, and method for constructing concrete structure |
| CN108529966A (en) * | 2018-04-20 | 2018-09-14 | 中建五局土木工程有限公司 | Seepage control and crack resistance pump concrete component design method and pouring molding method |
| CN110629759A (en) * | 2019-09-16 | 2019-12-31 | 中国化学工程第六建设有限公司 | Method for reducing internal and external temperature difference during winter construction of mass concrete foundation |
| CN211740424U (en) * | 2020-05-12 | 2020-10-23 | 中国建筑第八工程局有限公司 | Large-volume concrete temperature measurement lead fixing device |
| CN211740423U (en) * | 2020-03-31 | 2020-10-23 | 中建二局第二建筑工程有限公司 | Pre-buried and protection device of basic raft board temperature measurement point |
-
2021
- 2021-01-28 CN CN202110115500.XA patent/CN112922005A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888317A (en) * | 2006-07-31 | 2007-01-03 | 潘英豪 | Illuminating light reflective concrete curb and producing method thereof |
| CN202994333U (en) * | 2012-12-18 | 2013-06-12 | 中国新兴保信建设总公司 | Double-deck PVC concrete temperature measurement tube |
| CN105525616A (en) * | 2014-10-26 | 2016-04-27 | 王丰利 | Massive concrete pouring method |
| CN104790666A (en) * | 2015-04-13 | 2015-07-22 | 中冶建工集团有限公司 | Frost damage prevention method for cast-in-place concrete beams and slabs |
| JP2017166279A (en) * | 2016-03-18 | 2017-09-21 | 前田建設工業株式会社 | Heat-retaining mat for concrete, concrete placing form with heat-retaining mat, heat-retaining method for concrete, and method for constructing concrete structure |
| CN108529966A (en) * | 2018-04-20 | 2018-09-14 | 中建五局土木工程有限公司 | Seepage control and crack resistance pump concrete component design method and pouring molding method |
| CN110629759A (en) * | 2019-09-16 | 2019-12-31 | 中国化学工程第六建设有限公司 | Method for reducing internal and external temperature difference during winter construction of mass concrete foundation |
| CN211740423U (en) * | 2020-03-31 | 2020-10-23 | 中建二局第二建筑工程有限公司 | Pre-buried and protection device of basic raft board temperature measurement point |
| CN211740424U (en) * | 2020-05-12 | 2020-10-23 | 中国建筑第八工程局有限公司 | Large-volume concrete temperature measurement lead fixing device |
Non-Patent Citations (1)
| Title |
|---|
| 刘万林: "武广客专桥梁承台大体积砼施工技术", 《企业技术开发》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180746A (en) * | 2022-09-07 | 2023-05-30 | 中国化学工程第六建设有限公司 | Large-volume concrete construction process capable of effectively preventing concrete from shrinking in temperature |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108505644B (en) | CL composite concrete shear wall construction method | |
| CN110056189B (en) | Method for monitoring and controlling large-volume concrete construction by using Internet of things | |
| CN102323396B (en) | Mass concrete solid simulation testing device and trial construction method | |
| CN111519909A (en) | Construction process flow of assembled shear wall structure | |
| CN102747677A (en) | Bridge and construction method thereof | |
| CN102162305A (en) | Construction process for installing elastic slippage shock isolation support | |
| CN101858161B (en) | Construction method of low-temperature double-wall storage tanks | |
| CN111946124A (en) | Sectional material combined frame for silo and method for manufacturing silo with vertical shaft structure by using sectional material combined frame | |
| CN104894954B (en) | Urban Bridge pier stud reinforcing bar integral installation construction method | |
| CN112922005A (en) | Construction method of large-volume building foundation | |
| CN112049143A (en) | Method for building large-volume concrete bearing platform of large-scale low-temperature storage tank | |
| CN105887887A (en) | Underwater concrete grouting pile top elevation control construction method | |
| CN215669518U (en) | Heat-preservation and moisture-preservation maintenance structure for mass concrete | |
| CN210947010U (en) | Prefabricated interim fire control pond system | |
| CN110939152A (en) | Raft foundation construction method | |
| CN111648256A (en) | Pier body reinforcing construction method | |
| CN202119771U (en) | Entity simulation test device of mass concrete | |
| CN114474337B (en) | Rapid prefabrication and maintenance method for railway T beam in high-cold high-altitude area | |
| CN114277672B (en) | Large-span prestressed concrete bent cap structure and construction method thereof | |
| CN113338993B (en) | Connecting channel reinforcing ring beam structure and construction method thereof | |
| CN104153479B (en) | Reaction plate loading hole construction method and constructing device thereof | |
| CN107764733A (en) | The high-rise pumping method of pipe friction test device and concrete | |
| CN114961047A (en) | Novel construction method of composite concrete shear wall structure | |
| CN114892665A (en) | Construction method of mass concrete cooling water pipe | |
| CN113417310A (en) | Construction method for foundation of column cap type elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210608 |