CN218053201U - Vertical concrete member curing means of circulated use - Google Patents
Vertical concrete member curing means of circulated use Download PDFInfo
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- CN218053201U CN218053201U CN202220705337.2U CN202220705337U CN218053201U CN 218053201 U CN218053201 U CN 218053201U CN 202220705337 U CN202220705337 U CN 202220705337U CN 218053201 U CN218053201 U CN 218053201U
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Abstract
The utility model discloses a recyclable vertical concrete member curing device, which comprises a first vertical concrete member template component, a second vertical concrete member template component, a threading barrel, a template reinforcing member, a straight-through mechanism, a three-way mechanism, a straight pipeline and an L-shaped elbow; the first vertical concrete member template component and the second vertical concrete member template component are detachably connected up and down; the template reinforcing parts are respectively arranged on the peripheries of the first vertical concrete member template assembly and the second vertical concrete member template assembly; the threading cylinder is pre-buried on the first vertical concrete member template component; the threading barrel is connected with a three-way mechanism or a straight-through mechanism; the straight pipeline is connected to the straight-through mechanism and the three-way mechanism; a plurality of spraying holes are uniformly arranged on the straight pipeline at intervals; the straight pipeline is connected with an L-shaped elbow; the three-way mechanism is connected with a high-pressure pump and a delay valve; the defects that the maintenance of the vertical concrete member depends on manpower, the maintenance efficiency is low, and water resources are wasted at large scale are overcome.
Description
Technical Field
The utility model belongs to the technical field of the concrete member maintenance, more specifically relates to a vertical concrete member curing means of circulated use.
Background
After concrete is poured, if the concrete is hot and air-dried and is not maintained in time, the concrete curing moisture in the concrete can be evaporated too fast to form a dehydration phenomenon, so that cement particles which form gel cannot be fully hydrated, cannot be converted into stable crystals, lack of sufficient cohesive force, and accordingly, flaky or powdery falling can occur on the surface of the concrete. Further, when the concrete does not have sufficient strength, premature evaporation of water causes large shrinkage deformation and cracks due to drying shrinkage. Therefore, the curing of the concrete in the initial stage after the concrete is poured is very important, the curing should be performed immediately after the concrete is finally set, and the curing should be performed immediately after the pouring of the hard concrete is completed.
After concrete construction, curing is a key means for forming good strength, and the current curing means mainly comprises two modes of natural curing and water spraying curing. However, because the building shear wall and the building shear column have higher floor height, the maintenance is difficult to achieve, especially when an irregular concrete structure is encountered, the increase of the concrete solid strength cannot be ensured once the maintenance is improper, the concrete surface is easy to generate shrinkage cracks, and the acceptance time of a main structure is influenced; in addition, the prior art depends on manpower during maintenance, and has the problems of large water penetration, water source waste, large labor input and low efficiency; therefore, a vertical concrete member curing device which can realize automatic curing and high curing efficiency and can effectively realize green construction is urgently needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects or the improvement requirements of the prior art, the utility model provides a recyclable vertical concrete member curing device, which can detachably connect a second vertical concrete member template below a first vertical concrete member template by pre-embedding a threading cylinder on the first vertical concrete member template, wherein a plurality of first vertical concrete member templates and a plurality of second vertical concrete member templates are arranged around the vertical concrete members; after the vertical concrete member is poured, after the concrete strength reaches the dismantling strength, dismantling part of the vertical concrete member template, and reserving the vertical concrete member template pre-embedded with the mantle fiber, wherein the mantle fiber pre-embedded in the vertical concrete member template is connected with a straight-through mechanism and a three-way mechanism; the mode of installing the pipeline with the vertical spraying holes is adopted, so that the problem of maintenance of the vertical concrete member is effectively solved; the three-way mechanism is connected with an automatic delay valve and a high-pressure pump, so that the concrete structure can be continuously maintained for 28 days, the problem that the concrete maintenance time is not in place can be effectively solved, and the dilemma of labor shortage on a construction site can be effectively relieved; the utility model discloses a pipeline and the mode that sprays the hole and combine together have reduced labour's input on the whole, improve the efficiency of maintenance, have practiced thrift the water resource, can solve the waste water source of the big water full irrigation maintenance that the vertical concrete member maintenance of work progress exists, rely on artifical maintenance, problem that inefficiency.
In order to achieve the purpose, the utility model provides a vertical concrete component curing means of circulated use for the maintenance of vertical concrete component, including first vertical concrete component template subassembly, second vertical concrete component template subassembly, mantle fiber section of thick bamboo, template reinforcement, through mechanism, tee bend mechanism, straight pipeline and L shape elbow; wherein, the first and the second end of the pipe are connected with each other,
the first vertical concrete member template assembly and the second vertical concrete member template assembly are detachably connected up and down and arranged around the vertical concrete member; the template reinforcing members are respectively arranged at the peripheries of the first vertical concrete member template assembly and the second vertical concrete member template assembly and are used for reinforcing the integral stability of the first vertical concrete member template assembly and the second vertical concrete member template assembly;
the threading cylinder is pre-buried on the first vertical concrete component template assembly; one of the threading cylinders is connected with the three-way mechanism, and the other threading cylinders are connected with the through mechanism; the straight pipeline is connected to the straight-through mechanism and the three-way mechanism; a plurality of spraying holes are uniformly arranged on the straight pipeline at intervals; the straight pipeline is connected with an L-shaped elbow; the three-way mechanism is connected with a high-pressure pump and a delay valve; a detachable spraying pipeline arranged around the vertical concrete component is formed by the straight-through mechanism, the straight pipeline, the L-shaped elbow and the three-way mechanism.
Further, the first vertical concrete element formwork assembly comprises a plurality of first vertical concrete element formworks which are arranged around the vertical concrete elements in an end-to-end manner;
the second vertical concrete member formwork assembly comprises a plurality of second vertical concrete member formworks which are arranged around the vertical concrete members in an end-to-end connection manner;
the lower end of each first vertical concrete member template is detachably provided with one second vertical concrete member template;
the first vertical concrete member templates and the second vertical concrete member templates form a hollow frame structure respectively;
the formwork reinforcing members are respectively provided at the outer portion of each of the first vertical concrete member formwork and the second vertical concrete member formwork.
Further, the straight-through mechanism comprises a first mantle fiber which is matched and connected with the mantle fiber cylinder, a first connecting section which is arranged at one end of the first mantle fiber, and a straight pipeline which is vertically arranged at one end, far away from the first mantle fiber, of the first connecting section;
the straight pipeline is respectively arranged at two ends of the straight pipeline.
Furthermore, the three-way mechanism comprises a second mantle fiber which is matched and connected with the mantle fiber tube, a second connecting section which is arranged at one end of the second mantle fiber, and a three-way pipeline which is vertically arranged at one end, far away from the second mantle fiber, of the second connecting section.
Further, the three-way pipeline comprises a middle pipeline which is collinear with the central axis of the second connecting section and two branch pipelines which are collinear with each other and are both vertical to the middle pipeline;
one end of each branch pipeline, which is far away from the middle pipeline, is connected with one straight pipeline respectively.
Further, two adjacent straight pipelines which are not on the same plane are connected through the L-shaped elbow.
Further, the high-pressure pump and the time delay valve are arranged on the middle pipeline.
Generally, through the utility model discloses above technical scheme that conceive compares with prior art, can gain following beneficial effect:
(1) The utility model discloses a recyclable vertical concrete member curing device, through pre-burying a sleeve screw cylinder on a first vertical concrete member template, a second vertical concrete member template can be detachably connected below the first vertical concrete member template, and a plurality of first vertical concrete member templates and a plurality of second vertical concrete member templates are arranged around the vertical concrete member; after the vertical concrete member is poured, after the concrete strength reaches the dismantling strength, dismantling part of the vertical concrete member template, and reserving the vertical concrete member template pre-embedded with the mantle fiber, wherein the mantle fiber pre-embedded in the vertical concrete member template is connected with a straight-through mechanism and a three-way mechanism, the straight-through mechanism and the three-way mechanism are connected with a straight channel, the straight channel is connected with an L-shaped elbow, the three-way mechanism is connected with an automatic delay valve and a high-pressure pump, and a detachable spraying pipeline arranged around the vertical concrete member is formed together through the straight-through mechanism, the straight channel, the L-shaped elbow and the three-way mechanism; the difficult problem that the maintenance of the vertical concrete member of work progress does not target in place can be solved, the input of labour has been reduced, the efficiency of maintenance is improved, the water resource has been practiced thrift.
(2) The utility model discloses a vertical concrete member curing means of circulated use connects automatic time delay valve and high-pressure pump on three-way mechanism for concrete structure can carry out the maintenance of 28 days in succession, can effectively solve the not in place condition of concrete maintenance time, effectively alleviates the predicament of job site labour shortage.
(3) The utility model discloses a vertical concrete member curing means of circulated use adopts the pipeline and sprays the mode that the hole combines together, can solve the vertical concrete member maintenance of work progress and exist the big water full irrigation maintenance waste water source, relies on artifical maintenance, the problem of inefficiency.
(4) The utility model discloses a vertical concrete member curing means of circulated use adopts the pre-buried cover screw section of thick bamboo on vertical concrete member template, connects direct mechanism and three way mechanism on the cover screw section of thick bamboo again, and the pre-buried cover screw section of thick bamboo destroys the difficult problem of concrete integrality in can effectively solving the concrete, reaches the durability requirement of concrete.
(5) The utility model discloses a vertical concrete member curing means of circulated use, first vertical concrete member template subassembly, the vertical concrete member template subassembly of second, a mantle fiber section of thick bamboo, template reinforcement, direct mechanism, three-way mechanism, straight pipeline and L shape elbow are installing the use back, can demolish the back and install again when follow-up needs use and carry out used repeatedly, and easy dismounting is swift, can realize curing means's circulated, greatly reduced construction cost when improving the operating efficiency.
Drawings
FIG. 1 is a schematic view of a recyclable vertical concrete member curing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view of an installation structure of a formwork reinforcing member of a vertical concrete member maintenance device capable of being recycled according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a straight-through mechanism of a vertical concrete member maintenance device capable of being recycled in an embodiment of the present invention;
fig. 4 is a schematic structural view of a three-way mechanism of a recyclable vertical concrete member curing device according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a straight pipeline of a recyclable vertical concrete member curing device according to an embodiment of the present invention;
fig. 6 is the utility model discloses vertical concrete member curing means's of circulated use overall structure schematic diagram.
Throughout the drawings, like reference numerals designate like features, and in particular: 1-a first vertical concrete member template component, 11-a first vertical concrete member template, 2-a second vertical concrete member template component, 21-a second vertical concrete member template, 3-a threading barrel, 4-a template reinforcing member, 5-a straight-through mechanism, 51-a first threading, 52-a first connecting section, 53-a straight pipeline, 6-a three-way mechanism, 61-a second threading, 62-a second connecting section, 63-a three-way pipeline, 7-a straight pipeline, 71-a spraying hole, 8-an L-shaped elbow, 9-a vertical concrete member and 10-a concrete beam.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, when an element is referred to as being "fixed to", "disposed on" or "disposed on" another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element; the terms "mounted," "connected," and "provided" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1-6, the utility model provides a vertical concrete member curing device capable of being recycled, which is used for curing a vertical concrete member, and comprises a first vertical concrete member template component 1, a second vertical concrete member template component 2, a threading cylinder 3, a template reinforcing member 4, a straight-through mechanism 5, a three-way mechanism 6, a straight pipeline 7 and an L-shaped elbow 8; the first vertical concrete member template assembly 1 and the second vertical concrete member template assembly 2 are detachably connected up and down and are arranged around a vertical concrete member 9 (the vertical concrete member 9 is arranged below the concrete beam 10); the formwork reinforcing parts 4 are respectively arranged on the peripheries of the first vertical concrete member formwork assembly 1 and the second vertical concrete member formwork assembly 2 and are used for reinforcing the overall stability of the first vertical concrete member formwork assembly 1 and the second vertical concrete member formwork assembly 2; the threading barrel 3 is pre-buried on the first vertical concrete member template assembly 1; one of the threading cylinders 3 is connected with the three-way mechanism 6, and the other threading cylinders 3 are connected with the straight-through mechanism 5; the straight pipeline 7 is connected to the straight through mechanism 5 and the three-way mechanism 6; a plurality of spraying holes 71 are uniformly arranged on the straight pipeline 7 at intervals; the straight pipeline 7 is connected with an L-shaped elbow 8, and a detachable spraying pipeline is formed by the straight-through mechanism 5, the straight pipeline 7, the L-shaped elbow 8 and the three-way mechanism 6; the utility model adopts the vertical concrete component template with the pre-embedded threading barrel, the threading barrel is connected with the straight-through mechanism or the three-way mechanism, and the straight pipeline is connected with the straight-through mechanism or the three-way mechanism, thereby effectively solving the problem that the pre-embedded threading barrel in the concrete destroys the integrity of the concrete and achieving the durability requirement of the concrete; in addition, after the first vertical concrete member template assembly, the second vertical concrete member template assembly, the threading sleeves, the template reinforcing members, the straight-through mechanism, the three-way mechanism, the straight pipeline and the L-shaped elbow are installed and used, the first vertical concrete member template assembly and the second vertical concrete member template assembly can be detached and then installed for repeated use when in subsequent use, and the circulation of the maintenance device is realized.
Further, as shown in fig. 1 to 6, the first vertical concrete element formwork assembly 1 includes a plurality of first vertical concrete element formworks 11 arranged end to end around the vertical concrete elements 9, integrally forming a hollow first frame structure; the second vertical concrete member template assembly 2 comprises a plurality of second vertical concrete member templates 21 which are arranged around the vertical concrete members in an end-to-end manner, and a hollow second frame structure is also formed integrally; the lower end of each first vertical concrete member template 11 is detachably provided with one second vertical concrete member template 21; the thread bushing 3 is embedded in the middle of each first vertical concrete member template 11; the formwork reinforcement 4 is respectively arranged outside the first vertical concrete member formwork 11 and the second vertical concrete member formwork 21; and the adjacent template reinforcing parts 4 are fixed through fasteners, so that a plurality of frame structures formed by assembling the first vertical concrete member templates 11 and a plurality of frame structures formed by the second vertical concrete member templates 21 are reinforced respectively.
Further, as shown in fig. 1 to 6, when the first vertical concrete member formworks 1 are used for maintaining a vertical concrete member with a rectangular cross section, the number of the first vertical concrete member formworks 1 is 4, the number of the second vertical concrete member formworks 2 is also 4, and the 4 first vertical concrete member formworks 11 are connected end to form a hollow first rectangular frame structure; and 4 second vertical concrete member templates 21 are connected end to form a hollow second rectangular frame structure.
Further, as shown in fig. 1 to fig. 6, the cross section of the straight-through mechanism 5 is T-shaped, and includes a first threading 51 which is connected with the threading cylinder 3 in a matching manner, a first connecting section 52 which is arranged at one end of the first threading 51, and a linear pipe 53 which is vertically arranged at one end of the first connecting section 52 which is far away from the first threading 51; the straight pipe 7 is provided at both ends of the straight pipe 53.
Further, as shown in fig. 1-6, the three-way mechanism 6 includes a second mantle fiber 61 connected to the mantle fiber drum 3 in a matching manner, a second connecting section 62 disposed at one end of the second mantle fiber 61, and a three-way pipe 63 perpendicularly disposed at one end of the second connecting section 61 away from the second mantle fiber 61; the three-way pipeline 63 comprises a middle pipeline which is collinear with the central axis of the second connecting section 61 and two branch pipelines which are collinear with each other and are perpendicular to the middle pipeline, and one ends of the two branch pipelines, which are far away from the middle pipeline, are respectively connected with one straight pipeline 7; the straight pipeline 7 is provided with a plurality of spraying holes 71 at uniform intervals; adjacent two straight pipelines 7 which are not on the same plane are connected through the L-shaped elbow 8, a detachable spraying pipeline arranged around a vertical concrete member is formed through the straight-through mechanism 5, the straight pipelines 7, the L-shaped elbow 8 and the three-way mechanism 6, and the maintenance problem of the vertical concrete member is effectively solved by adopting a mode of installing a pipeline with vertical spraying holes; the middle pipeline is connected with a high-pressure pump and a delay valve, so that the problem that the concrete curing time is not in place can be effectively solved, and the dilemma of labor shortage on a construction site can be effectively relieved; the utility model discloses a pipeline can effectively solve the big water and fill the shortcoming of irritating the maintenance with the mode that sprays the hole and combine together, and the pertinence maintenance improves maintenance efficiency, and the water economy consumption helps realizing green construction.
The utility model provides a pair of circulated vertical concrete member maintenance method, including following step:
firstly, pre-embedding a bushing according to the size requirement when a first vertical concrete member template is processed, and well protecting;
secondly, assembling a first vertical concrete member template and a second vertical concrete member template according to requirements, respectively fixing the first vertical concrete member template and the second vertical concrete member template through template reinforcing parts, and checking the verticality and the flatness of the first vertical concrete member template and the second vertical concrete member template so as to ensure that a later-stage maintenance device is free from deviation in installation;
thirdly, pouring a vertical concrete member, immediately removing the template reinforcing member and the second vertical concrete member template after the strength of the vertical concrete member reaches the template removing strength, and reserving the first vertical concrete member template;
fourthly, respectively connecting the straight-through mechanism and the three-way mechanism with a screw sleeve on the first vertical concrete member template according to requirements, and ensuring the connection tightness;
fifthly, respectively connecting a straight pipeline on the straight-through mechanism and the three-way mechanism, and connecting an L-shaped elbow on the straight pipeline;
and sixthly, connecting a high-pressure pump, an automatic delay valve and a water source to the three-way mechanism to form the complete vertical concrete member curing device.
The utility model provides a pair of vertical concrete member curing means's of circulated use theory of operation: the first vertical concrete member templates and the second vertical concrete member templates are arranged around the vertical concrete members; after the vertical concrete member is poured, after the concrete strength reaches the dismantling strength, dismantling part of the vertical concrete member template, and reserving the vertical concrete member template pre-embedded with the mantle fiber, wherein the mantle fiber pre-embedded in the vertical concrete member template is connected with a straight-through mechanism and a three-way mechanism; the mode of installing the vertical pipeline with the spraying holes is adopted, the defect of large-water full-irrigation maintenance is effectively overcome, the targeted maintenance is realized, the maintenance efficiency is improved, the water consumption is saved, and the green construction is effectively realized; the three-way mechanism is connected with an automatic delay valve and a high-pressure pump, so that the concrete structure can be continuously maintained for 28 days, the problem that the concrete maintenance time is not in place can be effectively solved, and the dilemma of labor shortage on a construction site can be effectively relieved; the utility model discloses can solve the difficult problem that the vertical concrete member maintenance of work progress does not target in place, reduce labour's input, improve the efficiency of maintenance, practice thrift the water resource.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. The utility model provides a vertical concrete member curing means of circulated use which characterized in that: the concrete member formwork comprises a first vertical concrete member formwork component (1), a second vertical concrete member formwork component (2), a threading cylinder (3), a formwork reinforcing member (4), a straight-through mechanism (5), a three-way mechanism (6), a straight pipeline (7) and an L-shaped elbow (8); wherein the content of the first and second substances,
the first vertical concrete member template assembly (1) and the second vertical concrete member template assembly (2) are detachably connected up and down and are arranged around the vertical concrete member (9); the template reinforcing members (4) are respectively arranged at the peripheries of the first vertical concrete member template assembly (1) and the second vertical concrete member template assembly (2) and are used for reinforcing the integral stability of the first vertical concrete member template assembly (1) and the second vertical concrete member template assembly (2);
the threading barrel (3) is pre-buried on the first vertical concrete member template assembly (1); one of the threading cylinders (3) is connected with the three-way mechanism (6), and the other threading cylinders (3) are connected with the through mechanism (5); the straight pipeline (7) is connected to the straight-through mechanism (5) and the three-way mechanism (6); a plurality of spraying holes (71) are uniformly arranged on the straight pipeline (7) at intervals; the straight pipeline (7) is connected with an L-shaped elbow (8); and the three-way mechanism (6) is connected with a high-pressure pump and a time delay valve to form a detachable spraying pipeline arranged around the vertical concrete member.
2. The vertical concrete member curing device that can be recycled according to claim 1, wherein: the first vertical concrete member formwork assembly (1) comprises a plurality of first vertical concrete member formworks (11) which are arranged around a vertical concrete member in an end-to-end manner;
the second vertical concrete member formwork assembly (2) comprises a plurality of second vertical concrete member formworks (21) which are arranged around the vertical concrete members end to end;
the lower end of each first vertical concrete member template (11) is detachably provided with one second vertical concrete member template (21);
the first vertical concrete member formworks (11) and the second vertical concrete member formworks (21) form a hollow frame structure respectively;
the formwork reinforcement (4) is arranged outside each of the first vertical concrete element formwork (11) and the second vertical concrete element formwork (21).
3. A vertical concrete element maintenance device capable of being recycled according to claim 2, characterized in that: the straight-through mechanism (5) comprises a first threading (51) which is matched and connected with the threading barrel (3), a first connecting section (52) which is arranged at one end of the first threading (51) and a straight pipeline (53) which is vertically arranged at one end, far away from the first threading (51), of the first connecting section (52);
the straight pipeline (7) is arranged at two ends of the straight pipeline (53) respectively.
4. A vertical concrete element maintenance device that can be recycled according to any one of claims 1 to 3, wherein: the three-way mechanism (6) comprises a second mantle fiber (61) which is matched and connected with the mantle fiber barrel (3), a second connecting section (62) which is arranged at one end of the second mantle fiber (61), and a three-way pipeline (63) which is vertically arranged at one end, far away from the second mantle fiber (61), of the second connecting section (62).
5. A vertical concrete element maintenance device capable of being recycled according to claim 4, characterized in that: the three-way pipe (63) comprises a middle pipe collinear with the central axis of the second connecting section (62) and two branch pipes collinear with each other and both perpendicular to the middle pipe;
one end of each of the two branch pipelines, which is far away from the middle pipeline, is connected with one straight pipeline (7) respectively.
6. A vertical concrete element maintenance device capable of being recycled according to claim 5, characterized in that: two adjacent straight pipelines (7) which are not on the same plane are connected through the L-shaped elbow (8).
7. A vertical concrete element curing unit that can be recycled according to claim 5 or 6, wherein: the high-pressure pump and the delay valve are arranged on the middle pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220705337.2U CN218053201U (en) | 2022-03-29 | 2022-03-29 | Vertical concrete member curing means of circulated use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220705337.2U CN218053201U (en) | 2022-03-29 | 2022-03-29 | Vertical concrete member curing means of circulated use |
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| CN218053201U true CN218053201U (en) | 2022-12-16 |
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| CN202220705337.2U Active CN218053201U (en) | 2022-03-29 | 2022-03-29 | Vertical concrete member curing means of circulated use |
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| CN (1) | CN218053201U (en) |
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- 2022-03-29 CN CN202220705337.2U patent/CN218053201U/en active Active
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