CN114856185B - Variable-section double-umbrella-shaped water stop screw structure and construction method thereof - Google Patents
Variable-section double-umbrella-shaped water stop screw structure and construction method thereof Download PDFInfo
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- CN114856185B CN114856185B CN202210336094.4A CN202210336094A CN114856185B CN 114856185 B CN114856185 B CN 114856185B CN 202210336094 A CN202210336094 A CN 202210336094A CN 114856185 B CN114856185 B CN 114856185B
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- water stop
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- stop sheet
- screw
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a variable-section double-umbrella-shaped water stop screw structure and a construction method thereof, the variable-section double-umbrella-shaped water stop screw structure comprises a main screw, a first water stop sheet, a second water stop sheet and a third water stop sheet are respectively arranged on the main screw, the first water stop sheet is arranged in the middle of the main screw, the second water stop sheet and the third water stop sheet are respectively arranged at two ends of the main screw and are equal to the first water stop sheet in distance, the second water stop sheet and the third water stop sheet are umbrella-shaped water stop sheets, the main screw penetrates through templates at two sides of an outer wall in a butt joint mode, steel pipes are additionally arranged at two sides of the templates, and then a rotary mountain nut and a hexagonal nut are used for fastening, so that the templates are fixed. The invention can efficiently realize the reinforcement construction of the basement outer wall template, effectively avoid leakage caused by the cracking of concrete near the screw holes in the later stage of the basement outer wall, save the construction period, reduce the cost, have wide application range and have certain environmental protection value.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a variable-section double-umbrella-shaped water stop screw structure and a construction method thereof.
Background
Currently, with the development of construction technology, the condition of water seepage from the basement exterior is still not optimistic, and many construction units spend a great deal of money to repair the leakage from the basement exterior. The traditional method has defects or cannot meet the construction requirement. The site construction generally adopts a simple water-stopping screw, and a water-stopping sheet is arranged in the middle of the screw. Therefore, the field of basement external wall water stop screw leakage construction is a great difficult problem to be solved urgently.
Disclosure of Invention
The invention aims to provide the variable-section double-umbrella-shaped water stop screw structure, which can efficiently realize the reinforcement construction of the basement outer wall template, effectively avoid leakage caused by cracking of concrete near screw holes in the later stage of the basement outer wall, save the construction period, reduce the cost, and have wide application range and certain environmental protection value.
The invention adopts the following technical scheme:
the utility model provides a two umbelliform stagnant water screw rod structures of variable cross-section, includes the main screw rod, be equipped with first stagnant water piece, second stagnant water piece and third stagnant water piece on the main screw rod respectively, first stagnant water piece is installed main screw rod middle part, second stagnant water piece and third stagnant water piece set up respectively main screw rod both ends with first stagnant water piece distance equals, second stagnant water piece and third stagnant water piece are umbelliform stagnant water piece, main screw rod is to wearing outer wall both sides template, the steel pipe is established to the both sides of template additional, then adopts rotatory gable nut and hex nut to fasten, and then the fixed template.
Further, the first water stop sheet is of a bowl-shaped structure, an expansion water stop gasket is posted outside the first water stop sheet, polyurethane waterproof materials are filled between the expansion water stop gasket and the first water stop sheet, and rubber gaskets are arranged at two ends of one side, facing the upstream surface, of the first water stop sheet.
Further, the second water stop sheet and the third water stop sheet comprise umbrella tails fixed on the main screw rod, two ends of each umbrella tail are respectively hinged with lower umbrella sheets, the middle part of each lower umbrella sheet is hinged with the lower nest through a connecting rod, the lower nest is slidably connected onto the main screw rod, a movable elastic sheet installed on the main screw rod is arranged between the lower nest and the umbrella tails, the movable elastic sheet is used for limiting the position of the lower nest on the main screw rod when the lower nest moves forwards and backwards along the axis of the main screw rod, and the tail end of each lower umbrella sheet is provided with an arc-shaped bulge facing the upstream surface.
Further, the second water stop sheet is arranged on one side of the back surface, the third water stop sheet is arranged on one side of the back surface, and a rubber cushion block is arranged on one side of the arc-shaped bulge of the second water stop sheet facing the back surface.
Further, the outer parts of the lower umbrella bodies of the second water stop sheet and the third water stop sheet are respectively stuck with an expansion water stop washer, and a layer of polyurethane waterproof material is filled between the expansion water stop washers and the water stop sheets.
Further, the movable elastic sheet comprises an elastic-loading section sheet and a spring, the spring is arranged in the main screw, the bottom of the spring is fixedly connected with the main screw, the top of the spring is fixedly connected with the elastic-loading section sheet, and a rectangular hole matched with the elastic-loading section sheet is formed in the lower nest.
Further, the main screw is of a variable cross section type, and the diameter of the part of the main screw arranged in the outer wall is smaller than the diameter of the two ends.
Further, the main screw is provided with a triangular rib, the triangular rib is arranged between the second water stop sheet and the third water stop sheet and is in a triangular spike shape, and the triangular rib surrounds the main screw for one circle.
The invention also provides a construction method of the variable-section double-umbrella-shaped water stop screw structure, which is characterized by comprising the following steps of:
s1, binding reinforcing steel bars: arranging the steel bars according to the number and positions of the steel bars in the drawing, and binding by using binding wires;
s2, building a template: paying off according to the thickness of the wall body, and erecting a template according to the position of the line;
s3, drilling holes on the template according to a certain interval according to the requirement of the scheme, wherein the size of the holes is equal to the maximum diameter of the water stop screw rod;
s4, installing a water stop screw rod: the water-stopping screw rod passes through the screw rod hole, when one end of the water-stopping screw rod passes through the other side of the template, the water-stopping screw rod is abutted against the edge of the screw rod hole, the third water-stopping sheet is pressed by pushing force to be opened and fixed, and then the water-stopping screw rod passes through the screw rod hole at the other side of the template; the second water stop sheet penetrating into the end is pressed by pulling force through being close to the screw hole, so that the second water stop sheet is opened and fixed;
s5, fixing a template: after the position of the water stop screw is adjusted, steel pipes are additionally arranged on two sides of the template, and then the template is fixed by adopting a rotary gable nut and a hexagonal nut for fastening;
s6, pouring concrete: after the templates are fixed, pouring concrete in a layered pouring mode;
s7, removing the template and the water stop screw heads: after the concrete strength reaches 75%, the form is disassembled, and after the form is disassembled, the water stop screw head is disassembled, and the water stop screw head can be recycled.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the design of the triangular ribs, the contact area of the concrete and the screw is effectively increased, the reinforcement ratio is increased, the tensile property of the concrete is enhanced, and the cracking caused by self hydration heat reaction is avoided.
2. Adopt the design of first stagnant water piece, on traditional stagnant water piece basis, design into bowl form structure with it, still post the expansion stagnant water packing ring in the inside and outside of stagnant water piece simultaneously, still fill one deck polyurethane waterproof material between expansion stagnant water packing ring and the stagnant water piece, when meetting water, but expansion stagnant water packing ring and polyurethane waterproof material expansion foaming, and then fill the concrete gap, carry out the stagnant water.
3. The design of the second water stop sheet and the third water stop sheet is adopted, the size of the opening of the template is reduced through the umbrella-shaped design, and after the template is penetrated, the template is unfolded to be umbrella-shaped through pressing, so that the contact area of the water stop sheet and the concrete is effectively increased; an expansion water-stopping gasket is stuck outside the water-stopping sheet, and a layer of polyurethane waterproof material is filled between the expansion water-stopping gasket and the water-stopping sheet, so that the effect is the same as that of the first water-stopping sheet; one side of the second water stop piece is also provided with a rubber pad, so that the water stop piece is tightly attached to the template, the slurry leakage phenomenon of concrete from the screw hole is effectively reduced, the internal pore space of the concrete is reduced, and the compactness and self-waterproof capability of the concrete are enhanced.
4. The design of the integral water stop screw rod has three waterproof channels, and the design of the variable cross section effectively reduces the loss of mud, and effectively improves the waterproof performance of the water stop screw rod.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a first water stop sheet according to the present invention;
FIG. 3 is a schematic view of a second water stop sheet according to the present invention;
FIG. 4 is a schematic view of a third water stop sheet according to the present invention;
in the figure, a main screw rod 1, a first water stop sheet 2, a second water stop sheet 3, a third water stop sheet 4, a 5-steel pipe, a 6-mountain-shaped nut, a 7-hexagonal nut, an 8-expansion water stop washer, a 9-polyurethane waterproof material, a 10-umbrella tail, a 11-lower umbrella sheet, a 12-lower nest, a 13-upper elastic joint sheet, a 14-spring, a 15-rectangular hole, a 16-rubber cushion block, a 17-triangular rib and a 18-connecting rod.
Detailed Description
The invention provides a method for controlling liquid drop cooling overheat surfaces based on ion wind, which aims to make the purposes, technical schemes and effects of the invention better, clear and definite, and is further described in detail below with reference to specific embodiments. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain parts and device connections, etc. have been omitted, enlarged or reduced, and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The embodiment of the invention provides a variable-section double umbrella-shaped water stop screw structure which is used for the technical field of screw opposite-pulling reinforcement construction during formwork supporting of a basement outer wall, and comprises a main screw 1, a water stop sheet, triangular ribs 17, hexagonal nuts 7 and mountain nuts 6. The main screw 1 is of a variable cross section type, two ends are large, the middle is small, and the middle of the two ends can be hollow for reducing the weight of the screw; the end part can be clung to the screw hole, thereby effectively preventing mud loss. The sealing sheets are divided into a first sealing sheet 2, a second sealing sheet 3 and a third sealing sheet 4, the first sealing sheet 2 is arranged in the middle of the main screw 1 and is bowl-shaped, an expansion sealing gasket 8 is posted outside, polyurethane waterproof materials 9 are filled between the expansion sealing gasket 8 and the first sealing sheets, rubber gaskets 16 are arranged at two ends of one side of the first sealing sheet facing the upstream surface, and when water is met, the expansion sealing gasket 8 and the polyurethane waterproof materials 9 can be expanded and foamed, and then concrete gaps are filled for sealing water.
In a further preferred embodiment, the second water stop sheet 3 and the third water stop sheet 4 are respectively arranged at the left side and the right side of the main screw 1, have equal distance with the first water stop sheet 2, are umbrella-shaped and are adjustable. The umbrella-shaped structure is characterized in that the size of the opening of the template can be reduced, and after the template is penetrated, the umbrella-shaped structure is unfolded into an umbrella shape by pressing, so that the contact area of the water stop sheet and the concrete is effectively increased; the concrete structure is as follows: the second water stop sheet 3 and the third water stop sheet 4 comprise umbrella tails 10 fixed on the main screw 1, two ends of each umbrella tail 10 are respectively hinged with lower umbrella sheets 11, the middle part of each lower umbrella sheet 11 is hinged with a lower nest 12 through a connecting rod 18, the lower nest 12 is slidably connected to the main screw 1, a movable elastic sheet installed on the main screw 1 is arranged between the lower nest 12 and the umbrella tails 10 and used for limiting the position of the lower nest 12 on the main screw 1 when the lower nest 12 moves forwards and backwards along the axis of the main screw 1, each movable elastic sheet comprises an upper elastic joint sheet 13 and a spring 14, the spring 14 is arranged in the main screw, the bottom of each spring 14 is fixedly connected with the main screw, the top of each spring 14 is fixedly connected with the corresponding upper elastic joint sheet 13, a rectangular hole 15 matched with the corresponding upper elastic joint sheet 13 is formed in the lower nest, and the tail end of each lower umbrella sheet 11 is provided with an arc-shaped bulge towards the upstream surface; the second sealing-up piece 3 is installed on the back surface side, the third sealing-up piece 4 is installed on the back surface side, the arc-shaped bulge of the second sealing-up piece 3 is provided with a rubber cushion block 16 towards the back surface side, so that the sealing-up piece is tightly attached to the template, the phenomenon that concrete leaks from the screw hole is effectively reduced, the internal pore space of the concrete is reduced, and the compactness and self-waterproof capability of the concrete are enhanced. And the outside of second sealing up piece 3 and third sealing up piece 4 posts the expansion sealing up gasket, still fills one deck polyurethane waterproof material 9 between expansion sealing up gasket and sealing up piece, and the effect is the same as first sealing up piece 2. The triangular ribs 17 are arranged between the second water stop sheet 3 and the third water stop sheet 4 and are in triangular spike shapes and surround the main screw 1 for one circle. The hexagon nut 7 and the mountain-shaped nut 6 are accessories and are matched for use and are used for fixing the screw rod and the template.
The invention adopts the following devices and construction technical scheme:
1. binding reinforcing steel bars: and arranging the steel bars according to the number and the positions of the steel bars in the drawing, and binding by using binding wires.
2. Erecting a template: paying off according to the thickness of the wall body, and erecting the templates according to the positions of the wires.
3. And (3) hole making: according to the requirement on the scheme, holes are drilled on the template at certain intervals, and the size of the holes is equal to the maximum diameter of the water stop screw.
4. Installing a water stop screw rod: the water-stopping screw rod passes through the screw rod hole, when one end of the water-stopping screw rod passes through the other side of the template, the water-stopping screw rod is abutted against the edge of the screw rod hole, the third water-stopping sheet 4 is pressed by pushing force to be opened and fixed, and then the water-stopping sheet passes through the screw rod hole at the other side of the template; the second water stop sheet 3 penetrating into the end is pressed by pulling force to open and fix the second water stop sheet 3 by approaching to the screw hole.
5. Fixing the template: after the position of the water stop screw is adjusted, steel pipes 5 are additionally arranged on two sides of the template, and then the template is fixed by adopting a rotary gable nut 6 and a hexagonal nut 7.
6. Pouring concrete: after the templates are fixed, pouring concrete in a layered pouring mode.
7. Removing the template and the water stop screw head: after the concrete strength reaches 75%, the form is disassembled, and after the form is disassembled, the water stop screw head is disassembled, and the water stop screw head can be recycled.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The variable-section double-umbrella-shaped water stop screw structure is characterized by comprising a main screw, wherein a first water stop sheet, a second water stop sheet and a third water stop sheet are respectively arranged on the main screw, the first water stop sheet is arranged in the middle of the main screw, the second water stop sheet and the third water stop sheet are respectively arranged at two ends of the main screw and have equal distances with the first water stop sheet, the second water stop sheet and the third water stop sheet are umbrella-shaped water stop sheets, the main screw penetrates through templates at two sides of an outer wall in a butt-penetrating manner, steel pipes are additionally arranged at two sides of the templates, then a rotary mountain nut and a hexagonal nut are used for fastening, and the templates are further fixed;
the second water stop sheet and the third water stop sheet comprise umbrella tails fixed on the main screw rod, two ends of each umbrella tail are respectively hinged with lower umbrella sheets, the middle part of each lower umbrella sheet is hinged with a lower nest through a connecting rod, the lower nests are slidably connected onto the main screw rod, movable elastic sheets installed on the main screw rod are arranged between the lower nests and the umbrella tails, the movable elastic sheets are used for limiting the position of the lower nest on the main screw rod when the lower nests move forwards and backwards along the axis of the main screw rod of the umbrella, and arc-shaped protrusions facing the upstream surface are arranged at the tail ends of the lower umbrella sheets.
2. The variable-cross-section double-umbrella-shaped water stop screw structure according to claim 1, wherein the first water stop sheet is of a bowl-shaped structure, an expansion water stop gasket is posted outside the first water stop sheet, polyurethane waterproof materials are filled between the expansion water stop gasket and the first water stop sheet, and rubber gaskets are arranged at two ends of one side of the first water stop sheet facing the upstream surface.
3. The variable-cross-section double-umbrella-shaped water stop screw structure according to claim 1, wherein the second water stop sheet is arranged on one side of a water back surface, the third water stop sheet is arranged on one side of the water back surface, and a rubber cushion block is arranged on one side of the arc-shaped bulge of the second water stop sheet facing the water back surface.
4. The variable cross-section double umbrella-shaped water stop screw structure according to claim 1, wherein an expansion water stop washer is attached to the outer part of the lower umbrella body of the second water stop sheet and the third water stop sheet, and a layer of polyurethane waterproof material is filled between the expansion water stop washer and the water stop sheet.
5. The variable cross-section double umbrella-shaped water stop screw structure according to claim 1, wherein the movable elastic sheet comprises an upper elastic section sheet and a spring, the spring is arranged in a main screw, the bottom of the spring is fixedly connected with the main screw, the top of the spring is fixedly connected with the upper elastic section sheet, and a rectangular hole matched with the upper elastic section sheet is formed in the lower nest.
6. The variable cross-section double umbrella-shaped water stop screw structure according to claim 1, wherein the main screw is of variable cross-section type, and the diameter of the part of the main screw arranged in the outer wall is smaller than the diameter of the two ends.
7. The variable cross-section double umbrella-shaped water stop screw structure according to claim 1, wherein triangular ribs are arranged on the main screw, are arranged between the second water stop sheet and the third water stop sheet, are in a triangular spike shape and encircle the main screw.
8. A construction method of a variable cross-section double umbrella-shaped water stop screw structure as claimed in any one of claims 1 to 7, characterized by comprising the steps of:
s1, binding reinforcing steel bars: arranging the steel bars according to the number and positions of the steel bars in the drawing, and binding by using binding wires;
s2, building a template: paying off according to the thickness of the wall body, and erecting a template according to the position of the line;
s3, drilling holes on the template according to a certain interval according to the requirement of the scheme, wherein the size of the holes is equal to the maximum diameter of the water stop screw rod;
s4, installing a water stop screw rod: the water-stopping screw rod passes through the screw rod hole, when one end of the water-stopping screw rod passes through the other side of the template, the water-stopping screw rod is abutted against the edge of the screw rod hole, the third water-stopping sheet is pressed by pushing force to be opened and fixed, and then the water-stopping screw rod passes through the screw rod hole at the other side of the template; the second water stop sheet penetrating into the end is pressed by pulling force through being close to the screw hole, so that the second water stop sheet is opened and fixed;
s5, fixing a template: after the position of the water stop screw is adjusted, steel pipes are additionally arranged on two sides of the template, and then the template is fixed by adopting a rotary gable nut and a hexagonal nut for fastening;
s6, pouring concrete: after the templates are fixed, pouring concrete in a layered pouring mode;
s7, removing the template and the water stop screw heads: after the concrete strength reaches 75%, the form is disassembled, and after the form is disassembled, the water stop screw head is disassembled, and the water stop screw head can be recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210336094.4A CN114856185B (en) | 2022-03-31 | 2022-03-31 | Variable-section double-umbrella-shaped water stop screw structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210336094.4A CN114856185B (en) | 2022-03-31 | 2022-03-31 | Variable-section double-umbrella-shaped water stop screw structure and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114856185A CN114856185A (en) | 2022-08-05 |
| CN114856185B true CN114856185B (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210336094.4A Active CN114856185B (en) | 2022-03-31 | 2022-03-31 | Variable-section double-umbrella-shaped water stop screw structure and construction method thereof |
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| CN205908021U (en) * | 2016-08-01 | 2017-01-25 | 中国十七冶集团有限公司 | Novel basement outer wall sealing screw |
| CN108547448A (en) * | 2018-03-21 | 2018-09-18 | 五冶集团上海有限公司 | A kind of dual-purpose sealing up screw and preparation method thereof |
| CN208534047U (en) * | 2018-03-16 | 2019-02-22 | 浙江杰立建设集团有限公司 | Sealing up screw can be recycled in combined type |
| CN208981781U (en) * | 2018-08-30 | 2019-06-14 | 云南省建设投资控股集团有限公司 | A kind of removable screw rod of reinforced concrete wall segmentation |
| CN209907949U (en) * | 2019-03-22 | 2020-01-07 | 中铁二局集团有限公司 | Detachable water stop screw |
| CN210105312U (en) * | 2019-05-24 | 2020-02-21 | 黄卫民 | Special split bolt of building engineering construction |
| CN112576035A (en) * | 2020-12-11 | 2021-03-30 | 王小明 | Opposite-pulling screw rod for shear wall formwork erection construction and construction method thereof |
| CN214364978U (en) * | 2021-01-19 | 2021-10-08 | 中冶建工集团有限公司 | Water stop screw |
| CN113550565A (en) * | 2021-07-22 | 2021-10-26 | 晟通科技集团有限公司 | Template pulling piece and template structure |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000006846A1 (en) * | 1998-07-28 | 2000-02-10 | Fosroc International Limited | Waterstops and a method for their installation |
| AU2010201208A1 (en) * | 2009-03-25 | 2010-10-14 | Baulderstone Pty Ltd | Tie bar conduit |
| CN202144668U (en) * | 2011-06-28 | 2012-02-15 | 中国华冶科工集团有限公司 | Assembly type split bolt |
| CN103114722A (en) * | 2013-02-04 | 2013-05-22 | 中天建设集团有限公司 | Three-sectional water stopping screw for basement exterior wall |
| CN205908021U (en) * | 2016-08-01 | 2017-01-25 | 中国十七冶集团有限公司 | Novel basement outer wall sealing screw |
| CN208534047U (en) * | 2018-03-16 | 2019-02-22 | 浙江杰立建设集团有限公司 | Sealing up screw can be recycled in combined type |
| CN108547448A (en) * | 2018-03-21 | 2018-09-18 | 五冶集团上海有限公司 | A kind of dual-purpose sealing up screw and preparation method thereof |
| CN208981781U (en) * | 2018-08-30 | 2019-06-14 | 云南省建设投资控股集团有限公司 | A kind of removable screw rod of reinforced concrete wall segmentation |
| CN209907949U (en) * | 2019-03-22 | 2020-01-07 | 中铁二局集团有限公司 | Detachable water stop screw |
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| CN214364978U (en) * | 2021-01-19 | 2021-10-08 | 中冶建工集团有限公司 | Water stop screw |
| CN113550565A (en) * | 2021-07-22 | 2021-10-26 | 晟通科技集团有限公司 | Template pulling piece and template structure |
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| Publication number | Publication date |
|---|---|
| CN114856185A (en) | 2022-08-05 |
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