CN114278085B - Ultra-thin aluminium alloy stair template with pour auxiliary device - Google Patents
Ultra-thin aluminium alloy stair template with pour auxiliary device Download PDFInfo
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- CN114278085B CN114278085B CN202210009348.1A CN202210009348A CN114278085B CN 114278085 B CN114278085 B CN 114278085B CN 202210009348 A CN202210009348 A CN 202210009348A CN 114278085 B CN114278085 B CN 114278085B
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Abstract
The invention discloses an ultrathin aluminum profile stair template with pouring auxiliary devices, and relates to the technical field of stair pouring. When the auxiliary device is used, a worker can move through the auxiliary device, the pedal in the auxiliary device is used as a stair, the function of going upstairs and downstairs can be achieved, and when the auxiliary device is used, the reciprocating motion of the rubber film can generate a shaking effect on a concrete pouring layer, so that the poured concrete stair is firmer and more durable.
Description
Technical Field
The invention relates to the technical field of stair pouring, in particular to an ultrathin aluminum profile stair template with a pouring auxiliary device.
Background
The stairs are used as members for vertical traffic between floors in buildings and are used for traffic connection between floors and when the height difference is large, the stairs are also arranged in multi-storey and high-rise buildings which are provided with elevators and automatic ladders as main vertical traffic means, the high-rise buildings still need to keep the stairs for escape in fire despite of using the elevators as main vertical traffic means, the stairs comprise continuous stair sections (also called stair runs), platforms (rest platforms), enclosure members and the like, the horizontal projection distance between the lowest step and the highest step of the stairs is the stair length, the total height of the stairs is the stair height, the stairs are engraved in the heavy images on the brass devices in the war country period, the stairs are engraved in italy in 15-16 th century, the indoor stairs are liberated from the traditional closed space, and the indoor stairs are used as building components with decorative shapes.
Current stair generally are concrete placement and form, and this kind of mode convenient and fast, but the transportation of carrying out the concrete placement material now generally all is that the staff steps on transporting in the template, and long-time trampling probably can make the template take place skew, cracked condition, is unfavorable for production work, for this reason, we propose an ultra-thin aluminium alloy stair template that is equipped with pouring auxiliary device.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide an ultrathin aluminum profile stair template with a pouring auxiliary device.
In order to achieve the purpose, the invention provides the following technical scheme: an ultrathin aluminum profile stair template with a pouring auxiliary device comprises a fixed base plate, a first supporting column, two second supporting columns and a stair bottom die, wherein the two second supporting columns and the stair bottom die are oppositely arranged;
the two second supporting columns are fixedly connected through a plurality of fixing plates, the first supporting column and the second supporting columns are fixedly connected through a bracket, two fixing rods which are arranged in parallel are installed between the first supporting column and the second supporting columns, a platform mounting plate is fixedly installed on the first supporting column, a plurality of auxiliary devices are installed on the corresponding two fixing rods, and the auxiliary devices are matched with the platform mounting plate;
the auxiliary device comprises a mounting plate, the mounting plate is sleeved on a corresponding fixed rod and is fixedly connected with the fixed rod, a rotating plate is installed on the mounting plate in an embedded mode, a pedal is installed on the rotating plate in a rotating mode, a first baffle is fixedly installed on one side of the mounting plate, a second baffle is fixedly installed on the upper side of the mounting plate, and the rotating plate is arranged between the first baffle and the second baffle.
Preferably, each stair cover mold is provided with a pouring window, a concrete pouring layer is arranged between the stair bottom mold and the stair cover mold, one side of the stair side mold plate is provided with a first groove, and the platform top mold is horizontally arranged.
Preferably, a first reinforcing rib is fixedly installed in the first groove, a second reinforcing rib is fixedly installed on the upper side of the platform top die, and the first reinforcing rib and the second reinforcing rib are both in a zigzag shape.
Preferably, the cross section of the first support column is rectangular with four corners being circular arcs, the cross section of the second support column is circular, and the inclination angle of the fixing rod is the same as that of the stairs.
Preferably, install the guide bar between first support column and the second support column, guide bar and corresponding dead lever parallel arrangement, the guide bar is in the top of dead lever, the platform mounting groove has been seted up on the platform mounting panel, be equipped with cross anti-skidding decorative pattern in the platform mounting groove.
Preferably, a third groove is formed in the pedal, anti-skid grains are arranged in the third groove, a first gear rod is fixedly mounted on the rotating plate, two second gear rods which are oppositely arranged are fixedly mounted on the pedal, and the first gear rod is arranged between the two second gear rods.
Preferably, the first baffle is horizontally arranged, and the included angle between the second baffle and the horizontal plane is 30 degrees.
Preferably, the auxiliary device further comprises two installation cylinders, a first guide ring is installed on the upper side of the second baffle, two oppositely-arranged second guide rings are installed on one side of the installation plate, one end of a first nylon wire is fixedly installed on the upper side of the rotating plate, and the other end of the first nylon wire penetrates through the first guide ring and the second guide ring and is connected with the wire connecting device.
Preferably, the installation section of thick bamboo is inlayed and is fixed on stair side form board, two the installation section of thick bamboo sets up with two stair cover moulds respectively relatively, installation section of thick bamboo one side normal running fit has the carousel, install the stand pipe on the carousel, the stand pipe is the right angle pipe, sliding fit installs the piston board in the installation section of thick bamboo, the rubber membrane is installed to the one end that the installation section of thick bamboo is close to stair cover mould, the fourth recess has been seted up to one side that the rubber membrane is close to stair cover mould, be equipped with the cavity between piston board and the rubber membrane, the built-in spring that is equipped with of installation section of thick bamboo, spring and the coaxial setting of installation section of thick bamboo, the spring sets up between piston board and installation section of thick bamboo.
Preferably, one end of a second nylon wire is fixedly mounted on one side of the piston plate, and the other end of the second nylon wire penetrates through the mounting cylinder, the rotary disc and the guide pipe and is fixedly connected to the wire connecting device.
Compared with the prior art, the invention has the following beneficial effects:
1. when the auxiliary device is used, a worker can move through the auxiliary device, the pedal in the auxiliary device is used as a stair, the function of going upstairs and downstairs can be achieved, and the condition of template damage caused by directly treading on the template is prevented, so that the feeding operation of pouring and the inspection operation after pouring forming are more convenient, the condition of template damage is effectively prevented, the auxiliary device is independently installed and is not associated with a stair bottom die and a stair cover die, the influence of the vertical movement of the auxiliary device on the stair forming can be effectively reduced, and the condition of pouring failure is reduced.
2. When the auxiliary device is used, the auxiliary device can be used for moving, when a pedal of the auxiliary device is not used, the spring is in a loose state, the rotating plate is lifted up under the pulling force of the corresponding nylon rope, when relevant personnel trample the pedal, the guide rod can play a role of a handrail, so that the center of the pedal is stabilized for workers, when the pedal is trampled and moved down, the corresponding nylon rope pulls the two piston plates to extrude the spring, the piston plates move towards the direction of the spring, the space in the cavity is enlarged, the air pressure is reduced, the rubber membrane is sunken towards the inside of the mounting barrel, when the treadling on the pedal is stopped, the piston plates rapidly move towards the direction far away from the spring due to the action of the spring, the piston plates extrude the cavity, the space in the cavity is reduced, the air pressure is increased, the rubber membrane is protruded towards the outside of the mounting barrel, the using mode can be known, when the auxiliary device is used, the reciprocating motion of the rubber membrane can generate a vibration effect on a concrete pouring layer, when the auxiliary device is used, the concrete pouring is generally from descending to the stair, and the auxiliary device can effectively reduce the vibration of the concrete pouring layer and can be effectively removed through the air pouring of the auxiliary device when the concrete pouring.
3. The pedal is rotatably connected with the rotating plate, the center of gravity of the pedal is not arranged on one side close to the upper side of the stairs, the center of circle of the center inclines towards the lower part of the stairs, so that a worker can use the auxiliary device more conveniently and quickly, the first gear lever and the second gear lever are used for limiting the inclination angle, the rotating plate is arranged between the first baffle plate and the second baffle plate, and the first baffle plate is horizontally arranged so that the rotating plate can be in a horizontal state when the pedal is trampled.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the present invention.
Fig. 2 is a schematic view of the matching relationship between the fixing plate and the supporting column template of the present invention.
Fig. 3 is a schematic view of the matching relationship between the stair bottom mold and the stair cover mold.
Fig. 4 is a schematic view of the installation position of the auxiliary device of the present invention.
Fig. 5 is a schematic diagram of the basic structure of the auxiliary device of the present invention.
Fig. 6 is a schematic view of the installation position of the first baffle of the present invention.
Fig. 7 is a schematic structural diagram of positions of the first shift lever and the second shift lever according to the present invention.
Fig. 8 is an internal cross-sectional view of the mounting cylinder of the present invention.
In the figure: 101. fixing the bottom plate; 102. supporting the column template; 103. a stair bottom die; 104. covering a mold for the stairs; 105. a stair side form; 106. a first groove; 107. a first reinforcing rib; 108. a platform top die; 109. a second reinforcing rib; 110. a first support column; 111. a second support column; 112. a fixing plate; 113. a fixing rod; 114. a support; 115. a guide bar; 116. a platform mounting plate; 117. a platform mounting groove; 200. an auxiliary device; 201. mounting a plate; 202. a rotating plate; 203. a pedal; 204. a third groove; 205. anti-skid lines; 206. a first shift lever; 207. a second gear lever; 208. a first baffle; 209. a second baffle; 210. a first guide ring; 211. a first nylon thread; 212. a second guide ring; 213. a wire connector; 214. a second nylon thread; 215. mounting the cylinder; 216. a turntable; 217. a guide tube; 218. a piston plate; 219. a rubber film; 220. a fourth groove; 221. a cavity; 222. a spring; 300. and (6) pouring a concrete layer.
Detailed description of the preferred embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 8, the ultrathin aluminum profile stair template provided with the pouring auxiliary device includes a fixed bottom plate 101, a first support column 110, two second support columns 111 arranged oppositely, and a stair bottom mold 103, wherein the fixed bottom plate 101 is fixedly provided with a support column template 102, the stair bottom mold 103 is located above the support column template 102 and is arranged in a matching manner with the support column template, the upper side of the stair bottom mold 103 is provided with a group of stair cover molds 104 in a matching manner, the side surface of the stair bottom mold 103 is provided with a stair side mold plate 105, and the upper side of the stair bottom mold 103 is also provided with a platform top mold 108 in a matching manner.
Two second support columns 111 pass through a plurality of fixed plates 112 fixed connection, pass through support 114 fixed connection between first support column 110 and the second support column 111, install two parallel arrangement's dead lever 113 between first support column 110 and the second support column 111, fixed mounting has platform mounting panel 116 on the first support column 110, install a plurality of auxiliary device 200 on two corresponding dead levers 113, auxiliary device 200 sets up with platform mounting panel 116 cooperation, platform mounting panel 116 installs the top at the stair crown mould.
All seted up on every stair cover mould 104 and pour the window, be equipped with concrete placement layer 300 between stair bottom mould 103 and the stair cover mould 104, first recess 106 has been seted up to stair side form 105 one side, platform top mould 108 level sets up, fixed mounting has first strengthening rib 107 in first recess 106, platform top mould 108 upside fixed mounting has second strengthening rib 109, first strengthening rib 107 is the dogleg with second strengthening rib 109, the cross section of first support column 110 is the rectangle that the four corners is the circular arc, the cross section of second support column 111 is circular, the inclination of dead lever 113 is the same with the inclination of stair, two dead levers 113 can effectively strengthen auxiliary device 200's intensity.
A guide rod 115 is arranged between the first support column 110 and the second support column 111, the guide rod 115 is arranged in parallel with the corresponding fixing rod 113, the guide rod 115 is positioned above the fixing rod 113, a platform mounting groove 117 is formed in the platform mounting plate 116, and a cross-shaped anti-skid pattern is arranged in the platform mounting groove 117.
The third groove 204 has been seted up on the footboard 203, is equipped with anti-skidding line 205 in the third groove 204, and fixed mounting has first shelves pole 206 on the rotor plate 202, and fixed mounting has two second shelves poles 207 that set up relatively on the footboard 203, and first shelves pole 206 sets up between two second shelves poles 207, and first baffle 208 level sets up, and the contained angle of second baffle 209 and horizontal plane is 30 degrees, and second baffle 209 is used for restricting the rising angle of rotor plate 202.
The auxiliary device 200 further comprises two mounting cylinders 215, a first guide ring 210 is mounted on the upper side of the second baffle 209, two second guide rings 212 which are arranged oppositely are mounted on one side of the mounting plate 201, one end of a first nylon wire 211 is fixedly mounted on the upper side of the rotating plate 202, and the other end of the first nylon wire 211 penetrates through the first guide ring 210 and the second guide ring 212 and is connected with a wire connector 213.
The mounting cylinder 215 is embedded and fixed on the stair side template 105, the two mounting cylinders 215 are respectively arranged opposite to the two stair cover dies 104, a rotary disc 216 is rotatably matched on one side of the mounting cylinder 215, a guide pipe 217 is installed on the rotary disc 216, the guide pipe 217 is a right-angle pipe, a piston plate 218 is installed in the mounting cylinder 215 in a sliding fit mode, a rubber film 219 is installed at one end, close to the stair cover die 104, of the mounting cylinder 215, a fourth groove 220 is formed in one side, close to the stair cover die 104, of the rubber film 219, a cavity 221 is formed between the piston plate 218 and the rubber film 219, a spring 222 is installed in the mounting cylinder 215, the spring 222 and the mounting cylinder 215 are coaxially arranged, the spring 222 is arranged between the piston plate 218 and the mounting cylinder 215, one end of a second nylon wire 214 is fixedly installed on one side of the piston plate 218, and the other end of the second nylon wire 214 penetrates through the mounting cylinder 215, the rotary disc 216 and the guide pipe 217 and is fixedly connected to the wire connector 213.
It should be noted that, when the present invention is used, a worker can move the auxiliary device 200, and the step 203 in the auxiliary device 200 can be used as a stair to achieve the function of going upstairs and downstairs, but the condition of template damage caused by directly stepping on the template is prevented, so that the feeding operation for casting and the inspection operation after casting molding are more convenient, and the condition of template damage is effectively prevented, and the auxiliary device 200 is installed independently and is not associated with the stair bottom mold 103 and the stair cover mold 104, so that the influence of up-and-down movement of the auxiliary device 200 on stair molding can be effectively reduced, the condition of casting failure is reduced, the auxiliary device 200 can be used for moving, when the step 203 of the auxiliary device 200 is not used, the spring 222 is in a loose state, the rotating plate 202 is lifted up under the pulling force of the corresponding nylon rope, when the relevant person steps on the step 203, the guide rod 115 can function as an armrest to facilitate the center stabilization of the worker, when the pedal 203 moves downward due to stepping, the corresponding nylon rope pulls the two piston plates 218 to press the spring 222, so that the piston plates 218 move toward the spring 222, the space of the cavity 221 is enlarged, the air pressure is reduced, the rubber membrane 219 is further recessed into the mounting tube 215, when stepping on the pedal 203 is terminated, the piston plates 218 rapidly move toward a direction away from the spring 222 due to the action of the spring 222, the piston plates 218 press the cavity 221, the space in the cavity 221 is reduced, the air pressure is increased, the rubber membrane 219 is further raised toward the outside of the mounting tube 215, the above using manner can be known, when the auxiliary device 200 is used, the reciprocating motion of the rubber membrane 219 can generate a vibration effect on the concrete pouring layer 300, when pouring is performed, the pouring is generally performed from bottom to top, therefore, when concrete pouring materials are transported to the upper portion of the stairs, the auxiliary device 200 can be used for climbing upstairs and downstairs, so that the interference on the templates can be effectively reduced, the poured concrete pouring layer 300 can be shaken through the auxiliary device 200, the air in the poured concrete pouring layer is eliminated, the poured concrete stairs are firmer and more durable, the pedals 203 and the rotating plates 202 are in rotating connection, the gravity centers of the pedals 203 are not arranged on one side close to the upper portion of the stairs, the center of the center inclines towards the downstairs, so that workers can use the auxiliary device 200 more conveniently and rapidly, the first stop lever 206 and the second stop lever 207 are used for completing the limiting work on the inclination angle, the rotating plates 202 are arranged between the first stop lever 208 and the second stop lever 209, and the first stop lever 208 is horizontally arranged so that the rotating plates 202 are in a horizontal state when the pedals 203 are stepped.
It is further understood that the use of relational terms such as first and second, and the like, herein, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an ultra-thin aluminium alloy stair template with pour auxiliary device which characterized in that: the stair bottom die structure comprises a fixed bottom plate (101), a first supporting column (110), two second supporting columns (111) and a stair bottom die (103), wherein the two second supporting columns (111) and the stair bottom die (103) are oppositely arranged, a supporting column template (102) is fixedly installed on the fixed bottom plate (101), the stair bottom die (103) is located above the supporting column template (102) and is matched with the supporting column template, a group of stair cover dies (104) are installed on the upper side of the stair bottom die (103) in a matched mode, stair side die plates (105) are installed on the side surfaces of the stair bottom die (103), and a platform top die (108) is also installed on the upper side of the stair bottom die (103) in a matched mode;
the two second supporting columns (111) are fixedly connected through a plurality of fixing plates (112), the first supporting column (110) is fixedly connected with the second supporting columns (111) through a support (114), two fixing rods (113) which are arranged in parallel are arranged between the first supporting column (110) and the second supporting columns (111), a platform mounting plate (116) is fixedly arranged on the first supporting column (110), a plurality of auxiliary devices (200) are arranged on the corresponding two fixing rods (113), and the auxiliary devices (200) are matched with the platform mounting plate (116);
the auxiliary device (200) comprises a mounting plate (201), the mounting plate (201) is sleeved on a corresponding fixing rod (113) and fixedly connected with the fixing rod, a rotating plate (202) is embedded on the mounting plate (201), a pedal (203) is rotatably mounted on the rotating plate (202), a first baffle (208) is fixedly mounted on one side of the mounting plate (201), a second baffle (209) is fixedly mounted on the upper side of the mounting plate (201), and the rotating plate (202) is arranged between the first baffle (208) and the second baffle (209);
the auxiliary device (200) further comprises two mounting cylinders (215), a first guide ring (210) is mounted on the upper side of the second baffle (209), two second guide rings (212) which are arranged oppositely are mounted on one side of the mounting plate, one end of a first nylon wire (211) is fixedly mounted on the upper side of the rotating plate (202), and the other end of the first nylon wire (211) penetrates through the first guide ring (210) and the second guide rings (212) and is connected with a wire connecting device (213);
the mounting cylinder (215) is inlaid and fixed on the stair side template (105), the two mounting cylinders (215) are respectively arranged opposite to the two stair cover dies (104), a rotary table (216) is rotatably matched on one side of the mounting cylinder (215), a guide pipe (217) is installed on the rotary table (216), a piston plate (218) is installed in the mounting cylinder (215) in a sliding fit mode, a rubber film (219) is installed at one end, close to the stair cover die (104), of the mounting cylinder (215), a fourth groove (220) is formed in one side, close to the stair cover die (104), of the rubber film (219), a cavity (221) is formed between the piston plate (218) and the rubber film (219), a spring (222) is installed in the mounting cylinder (215), the spring (222) and the mounting cylinder (215) are coaxially arranged, and the spring (222) is arranged between the piston plate (218) and the mounting cylinder (215);
one end of a second nylon wire (214) is fixedly installed on one side of the piston plate (218), and the other end of the second nylon wire (214) penetrates through the installation barrel (215), the rotary disc (216) and the guide pipe (217) and is fixedly connected to the wire connecting device (213).
2. The ultra-thin aluminum profile stair formwork with the pouring auxiliary device is provided with the claim 1, and is characterized in that: every all seted up on stair cover mould (104) and pour the window, be equipped with concrete placement layer (300) between stair bottom mould (103) and stair cover mould (104), first recess (106) have been seted up to stair side form (105) one side, platform top mould (108) horizontal setting.
3. The ultra-thin aluminum profile stair formwork with the pouring auxiliary device is provided with the pouring auxiliary device according to claim 2, and is characterized in that: a first reinforcing rib (107) is fixedly installed in the first groove (106), a second reinforcing rib (109) is fixedly installed on the upper side of the platform top die (108), and the first reinforcing rib (107) and the second reinforcing rib (109) are both in a zigzag shape.
4. The ultra-thin aluminum profile stair formwork with the pouring auxiliary device is provided with the claim 1, and is characterized in that: the cross section of the first supporting column (110) is a rectangle with four circular arcs, the cross section of the second supporting column (111) is a circle, and the inclination angle of the fixing rod (113) is the same as that of the stair.
5. The ultra-thin aluminum profile stair template provided with the pouring auxiliary device according to claim 4, characterized in that: install guide bar (115) between first support column (110) and second support column (111), guide bar (115) and corresponding dead lever (113) parallel arrangement, guide bar (115) are in the top of dead lever (113), platform mounting groove (117) have been seted up on platform mounting panel (116), be equipped with cross skid resistant pattern in platform mounting groove (117).
6. The ultra-thin aluminum profile stair formwork with the pouring auxiliary device is provided with the claim 1, and is characterized in that: the pedal (203) is provided with a third groove (204), the third groove (204) is internally provided with anti-skid grains (205), the rotating plate (202) is fixedly provided with a first gear lever (206), the pedal (203) is fixedly provided with two second gear levers (207) which are oppositely arranged, and the first gear lever (206) is arranged between the two second gear levers (207).
7. The ultra-thin aluminum profile stair template provided with the pouring auxiliary device according to claim 1, and is characterized in that: the first baffle (208) is horizontally arranged, and the included angle between the second baffle (209) and the horizontal plane is 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009348.1A CN114278085B (en) | 2022-01-06 | 2022-01-06 | Ultra-thin aluminium alloy stair template with pour auxiliary device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210009348.1A CN114278085B (en) | 2022-01-06 | 2022-01-06 | Ultra-thin aluminium alloy stair template with pour auxiliary device |
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| CN114278085A CN114278085A (en) | 2022-04-05 |
| CN114278085B true CN114278085B (en) | 2023-03-31 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214531914U (en) * | 2021-03-09 | 2021-10-29 | 山东省建设建工（集团）有限责任公司 | Closed aluminum alloy stair template |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3482531B2 (en) * | 1992-10-26 | 2003-12-22 | 株式会社横森製作所 | How to build stairs |
| JPH0813797A (en) * | 1994-07-01 | 1996-01-16 | Fujiki Komuten:Kk | Form construction work for staircase |
| CN210396124U (en) * | 2019-07-26 | 2020-04-24 | 郑州正盛铝模板有限公司 | Cast-in-place concrete stair mold |
| CN211817993U (en) * | 2020-01-08 | 2020-10-30 | 广东蕉岭建筑工程集团有限公司 | Adjustable stair step width regularization stair |
| CN212836697U (en) * | 2020-06-24 | 2021-03-30 | 中能建西北城市建设有限公司 | Shaping support mold for stair forming |
| CN112360141A (en) * | 2020-12-07 | 2021-02-12 | 张光强 | Moisturizing maintenance formula concrete placement mould |
| CN113756573B (en) * | 2021-10-08 | 2022-09-30 | 福建省建融工程建设有限公司 | Concrete stair pouring template and installation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214531914U (en) * | 2021-03-09 | 2021-10-29 | 山东省建设建工（集团）有限责任公司 | Closed aluminum alloy stair template |
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