CN115324292A - Assembled type fast-assembling stair construction method - Google Patents

Assembled type fast-assembling stair construction method Download PDF

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Publication number
CN115324292A
CN115324292A CN202211105914.5A CN202211105914A CN115324292A CN 115324292 A CN115324292 A CN 115324292A CN 202211105914 A CN202211105914 A CN 202211105914A CN 115324292 A CN115324292 A CN 115324292A
Authority
CN
China
Prior art keywords
panel
beam frame
stair
construction method
supporting block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211105914.5A
Other languages
Chinese (zh)
Inventor
肖加详
童军
许皓
甘保翔
季晓韦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongke Construction Engineering Group Co ltd
Original Assignee
Zhongke Construction Engineering Group Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhongke Construction Engineering Group Co ltd filed Critical Zhongke Construction Engineering Group Co ltd
Priority to CN202211105914.5A priority Critical patent/CN115324292A/en
Publication of CN115324292A publication Critical patent/CN115324292A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02Stairways; Layouts thereof
    • E04F11/022Stairways; Layouts thereof characterised by the supporting structure
    • E04F11/025Stairways having stringers
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02Stairways; Layouts thereof
    • E04F11/104Treads
    • E04F11/112Treads of metal or with an upper layer of metal
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02Stairways; Layouts thereof
    • E04F11/104Treads
    • E04F11/16Surfaces thereof; Protecting means for edges or corners thereof
    • E04F11/17Surfaces
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00Implements for finishing work on buildings
    • E04F21/26Implements for finishing work on buildings for mounting staircases, e.g. tools for marking steps

Abstract

The invention relates to an assembly type fast-assembling stair construction method, which comprises the following steps: step 1: prefabricating a stair beam frame, wherein the stair beam frame comprises a left beam frame and a right beam frame which are inclined, a plurality of left supporting blocks corresponding to corresponding steps are arranged on the inner side of the left beam frame, a plurality of right supporting blocks corresponding to corresponding steps are arranged on the inner side of the right beam frame, and a section space is formed between the left supporting blocks and the right supporting blocks; and 2, step: prefabricating a ladder deck, the ladder deck comprising a panel; and step 3: and in the field assembly, a prefabricated stair beam frame is installed in place and then a stair board is installed, the panel is partially supported by the left supporting block and the right supporting block, and the panel is connected with a section space between the left supporting block and the right supporting block. The step plates and the stair beam frame are manufactured in a split mode, so that the step plates can be independently and independently transported, and the step plates can be stably fixed only by a small amount of cement during field assembly. Therefore, the assembled quick-assembly stair construction method is lighter and more convenient in stair hoisting and quick and convenient in field assembly.

Description

Assembled type fast-assembling stair construction method
Technical Field
The invention relates to the technical field of assembly type buildings, in particular to an assembly type quick-mounting stair construction method.
Background
The assembly type building refers to a building which is formed by transferring a large amount of field operation work in the traditional construction mode to a factory, processing and manufacturing building components and accessories (such as floor slabs, wall slabs, stairs, balconies and the like) in the factory, transporting the components and accessories to a building construction site, and assembling and installing the components and the accessories on the site in a reliable connection mode. The prefabricated building mainly comprises a prefabricated concrete structure, a steel structure, a modern wood structure building and the like, and is a representative of a modern industrial production mode due to the adoption of standardized design, factory production, assembly construction, informatization management and intelligent application.
In the prior art, the traditional assembled stairway comprises a beam frame and a stair board which are all prefabricated into a whole in a factory, and only needs to be hoisted and installed on the site. However, the stair with the structure has the disadvantages that the whole integral component is heavy in weight and extremely inconvenient to carry in the production process. When the stair is transported to a site for installation, the whole weight is heavy, and the installation can be completed only by the cooperation of a plurality of persons and a large crane, so that an assembly type fast-assembling stair construction method needs to be developed, the stair is more portable in hoisting, and the site assembly is rapid and convenient.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the assembling type fast-assembling stair construction method is provided, the stair is more portable in lifting and the field assembly is fast and convenient.
The technical scheme adopted by the invention for solving the technical problems is as follows: an assembled fast-assembling stair construction method comprises the following steps:
step 1: prefabricating a stair beam frame, wherein the stair beam frame comprises a left beam frame and a right beam frame which are inclined, a plurality of left supporting blocks corresponding to corresponding steps are arranged on the inner side of the left beam frame, a plurality of right supporting blocks corresponding to corresponding steps are arranged on the inner side of the right beam frame, and a section space is formed between the left supporting blocks and the right supporting blocks;
and 2, step: prefabricating a ladder deck, the ladder deck comprising a panel;
and step 3: and in the field assembly, the prefabricated stair beam frame is installed in place and then the stair boards are installed, the panel is partially supported by the left supporting block and the right supporting block, and the panel is connected with the section space between the left supporting block and the right supporting block.
Preferably, the bottom platforms are arranged at the bottoms of the left beam frame and the right beam frame, the top platforms are arranged at the tops of the left beam frame and the right beam frame, and the top platforms, the bottom platforms, the left beam frame, the right beam frame, the left supporting blocks and the right supporting blocks are prefabricated into a whole in a factory in advance.
Preferably, the panels comprise an extension panel positioned at the upper part and a support panel positioned at the lower part, the length of the extension panel is greater than that of the support panel, the support panel is partially supported by the left support block and the right support block, and cement is filled in a gap formed by the extension panel, the left support block, the right support block, the left beam frame and the right beam frame during the field assembly in the step 3;
the panel bottom surface is provided with salient posts which are arranged on two sides in rows, a left groove is formed in the top surface of the left supporting block, a right groove is formed in the top surface of the right supporting block, the salient posts on the two sides of the panel bottom surface are correspondingly arranged in the left groove and the right groove, and cement is filled in a gap formed by the salient posts, the left groove and the right groove when the panel bottom surface is assembled on site in the step 3.
Preferably, each side of the protruding columns is provided with two protruding columns, and cement is filled in gaps formed by the two protruding columns and the left groove and the right groove respectively, so that the cross section of the cement is in a shape like a Chinese character 'shan'.
Preferably, a wooden plate or a stone plate or a non-skid steel plate is arranged on the top surface of the panel during the field assembly.
Preferably, the section of antiskid steel sheet is the font of falling U, the panel surface is arranged in to the steel decking of antiskid steel sheet, the steel curb plate of the both sides of antiskid steel sheet is arranged in the space that panel and left roof beam structure, right roof beam structure formed respectively, and when the on-the-spot assembly the steel curb plate is filled with cement and is made antiskid steel sheet fixed with the space that panel, left roof beam structure, right roof beam structure formed.
Preferably, the surface of the steel panel of the antiskid steel plate is provided with antiskid strips.
Preferably, the anti-skid steel plate is provided with a baffle at the front side, and the baffle can shield a hollow part formed by the previous step plate and the next step plate.
Preferably, the baffle and the steel panel of the antiskid steel plate are of an integral structure.
The invention has the beneficial effects that: the left supporting block and the right supporting block of the stair beam frame are provided with section spaces, the stair beam frame does not comprise a step plate, and therefore the whole weight of the stair beam frame which is manufactured is lighter than that of the existing complete prefabricated stair, and hoisting and transportation are facilitated. The stair boards and the stair beam frame are manufactured in a split mode, so that the stair boards can be independently and independently transported, and the stair boards can be stably fixed only by a small amount of cement during field assembly. Therefore, the assembled quick-assembly stair construction method is lighter and more convenient in stair hoisting and quick and convenient in field assembly.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a first embodiment of the assembled quick-install stairway of the present invention;
FIG. 2 is a schematic front view of a first embodiment of the assembled quick-install stairway of the present invention;
FIG. 3 is a rear view of a first embodiment of the fabricated quick-install stairway of the present invention;
FIG. 4 isbase:Sub>A schematic A-A diagram of FIG. 3;
FIG. 5 is a schematic structural view of the stair beam frame of the present invention;
FIG. 6 is a schematic view of the construction of the ladder of the present invention;
FIG. 7 is a schematic structural view of a antiskid steel plate according to a second embodiment of the present invention;
FIG. 8 is a schematic perspective view of a second embodiment of the assembled quick-install staircase according to the present invention;
FIG. 9 is a rear schematic view of a second embodiment of the fabricated quick-install stairway of the present invention;
FIG. 10 is a schematic view B-B of FIG. 9;
FIG. 11 is a schematic structural view of a third embodiment of the antiskid steel plate of the present invention;
FIG. 12 is a first perspective view of a third embodiment of the fabricated quick-install stairway of the present invention;
FIG. 13 is a second perspective view of a third embodiment of the fabricated quick-install staircase according to the present invention;
101, a left beam frame; 102. a right beam frame; 103. a left support block; 104. a right support block; 105. a top platform; 106. a bottom platform; 2. a step plate; 201. a panel; 202. a projecting post; 203. an extension panel; 204. a support panel; 3. an anti-skid steel plate; 301. a steel panel; 302. a steel side plate; 303. and a baffle plate.
Detailed Description
The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The first embodiment is as follows: as shown in fig. 1 to 6, an assembly type fast-assembling stair construction method comprises the following steps:
step 1: prefabricating a stair beam frame, wherein the stair beam frame comprises a left beam frame 101 and a right beam frame 102 which are inclined, a plurality of left supporting blocks 103 corresponding to corresponding steps are arranged on the inner side of the left beam frame 101, a plurality of right supporting blocks 104 corresponding to corresponding steps are arranged on the inner side of the right beam frame 102, and a section space is formed between the left supporting blocks 103 and the right supporting blocks 104;
step 2: a prefabricated step, said step 2 comprising a panel 201;
and step 3: and (3) field assembly, namely mounting the stair boards after the prefabricated stair beam frame is mounted in place, wherein part of the panel 201 is supported by the left supporting block 103 and the right supporting block 104, and the panel 201 is connected with a section space between the left supporting block 103 and the right supporting block 104.
The bottom platforms 106 are arranged at the bottoms of the left beam frame 101 and the right beam frame 102, the top platforms 105 are arranged at the tops of the left beam frame 101 and the right beam frame 102, and the top platforms 105, the bottom platforms 106, the left beam frame 101, the right beam frame 102, the left supporting block 103 and the right supporting block 104 are prefabricated into a whole in a factory in advance. The top platform 105, the bottom platform 106, the left beam frame 101, the right beam frame 102, the left supporting block 103 and the right supporting block 104 are prefabricated into a whole in a factory in advance to form a stair beam frame, so that the stair beam frame is light in hoisting and quick and convenient to assemble on site. The top platform 105, the bottom platform 106, the left beam frame 101, the right beam frame 102, the left supporting block 103 and the right supporting block 104 are prefabricated and formed, so that the on-site manufacturing time can be reduced, and the on-site installation and assembly are facilitated.
The cross section space is arranged between the left supporting block 103 and the right supporting block 104 of the stair beam frame, the stair beam frame does not comprise the step plate 2, and therefore the whole weight of the manufactured stair beam frame is lighter than that of the existing complete prefabricated stair, and the lifting and the transportation are more convenient. The step boards 2 and the stair beam frame are manufactured in a split mode, so that the step boards 2 can be independently and independently transported, and the step boards 2 can be stably fixed only by a small amount of cement during field assembly.
The panel 201 comprises an extension panel 203 at the upper part and a support panel 204 at the lower part, the length of the extension panel 203 is greater than that of the support panel 204, the support panel 204 is partially supported by the left support block 103 and the right support block 104, and cement is filled in a gap formed by the extension panel 203, the left support block 103, the right support block 104, the left beam frame 101 and the right beam frame 102 when the panel is assembled in the field in the step 3;
the bottom surface of the panel 201 is provided with protruding columns 202 which are arranged on two sides in rows, the top surface of the left supporting block 103 is provided with a left groove, the top surface of the right supporting block 104 is provided with a right groove, the protruding columns 202 on two sides of the bottom surface of the panel 201 are correspondingly arranged in the left groove and the right groove, and cement is filled in a gap formed by the protruding columns 202, the left groove and the right groove when the panel is assembled on site in the step 3.
Preferably, two protruding columns 202 are arranged on each side, and cement is filled in gaps formed between the two protruding columns 202 and the left groove and the right groove respectively, so that the cross section of the cement is in a shape like a Chinese character 'shan'.
Therefore, when the stair boards 2 are installed on site, only a small amount of cement needs to be configured to fix the stair boards 2 with the left and right support blocks 103 and 104. Preferably, every side protrusion post 202 is equipped with two, makes the cement cross-section be "mountain" font after two protrusion posts 202 fill the cement with the space that left recess, right recess formed respectively, and this kind of structure can make the step 2 have certain removal allowance when the installation, and in the fixed back of cement, the step 2 can form more firm mounting structure with left supporting shoe 103, right supporting shoe 104 in addition, can bear slight vibrations and the difficult fracture of step 2.
And 3, installing a wooden plate or a stone plate or an anti-skid steel plate 3 on the top surface of the panel 201 during field assembly in the step 3. In the second embodiment, as shown in fig. 7 to 10, the section of the antiskid steel plate 3 is in an inverted U shape, the steel panel 301 of the antiskid steel plate 3 is placed on the surface of the panel 201, the steel side plates 302 on both sides of the antiskid steel plate 3 are respectively placed in the gap formed by the panel 201, the left beam frame 101 and the right beam frame 102, and cement is filled in the gap formed by the steel side plates 302, the panel 201, the left beam frame 101 and the right beam frame 102 during field assembly to fix the antiskid steel plate 3. Preferably, the surface of the steel panel 301 of the antiskid steel plate 3 is provided with antiskid strips. Through the antiskid steel plate 3 who sets up this kind of structure, only need a small amount of cement can make antiskid steel plate 3 fixed with step 2, required welding process or bolted connection process when reducing antiskid steel plate 3 installation.
In the third embodiment, preferably, as shown in fig. 11 to 13, the front side of the antiskid steel plate 3 is further provided with a baffle 303, and the baffle 303 shields the hollow portion formed by the previous step 2 and the next step 2. The baffle plate 303 and the steel panel 301 of the antiskid steel plate 3 are of an integral structure. The baffle 303 of the antiskid steel plate 3 covered on the subsequent ladder board 2 is fixedly connected with the panel 201 of the previous ladder board 2. The baffle 303 of the latter antiskid steel plate 3 and the panel 201 of the former ladder plate 2 can be connected by bolts or directly connected by cement or glue. Because the baffle 303 and the steel panel 301 of the antiskid steel plate 3 are of an integral structure, even if the baffle 303 of the following antiskid steel plate 3 and the panel 201 of the previous ladder board 2 do not have any connection measures, the blocking effect of the baffle 303 is not influenced.
Firstly, a stair beam frame is manufactured in advance in a factory, as shown in fig. 5, a top platform 105, a bottom platform 106, a left beam frame 101, a right beam frame 102, a left supporting block 103 and a right supporting block 104 are prefabricated in advance in the factory into a whole to form the stair beam frame, and in addition, a stair plate 2 shown in fig. 6 and an anti-skid steel plate 3 shown in fig. 7 or 11 are manufactured separately; transporting the stair beam frame, the stair plates 2 and the anti-skid steel plates 3 to a site where the stair is required to be assembled; assembling the stair beam frame and the stair plate 2 according to the figure 2, and fixing the stair plate 2 and the stair beam frame by using a small amount of cement; or, the stair beam frame, the stair boards 2 and the anti-skid steel plates 3 are assembled according to the structure shown in the figure 8 or the figure 12, the stair boards 2 and the anti-skid steel plates 3 can be fixed with the stair beam frame by using a small amount of cement, the stair beam frame is light in hoisting, the field assembly is fast and simple, and the required procedures are few. The assembled quick-assembly stair can be widely applied to LOFT duplex apartments, multi-storey commercial squares and other scenes such as indoor stairs and outdoor stairs.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (9)

1. The utility model provides an assembled fast-assembling stair construction method which characterized in that: the method comprises the following steps:
step 1: the prefabricated stair beam frame comprises a left beam frame (101) and a right beam frame (102) which are inclined, a plurality of left supporting blocks (103) corresponding to corresponding steps are arranged on the inner side of the left beam frame (101), a plurality of right supporting blocks (104) corresponding to corresponding steps are arranged on the inner side of the right beam frame (102), and a section space is formed between the left supporting blocks (103) and the right supporting blocks (104);
and 2, step: prefabricating a ladder board, wherein the ladder board (2) comprises a panel (201);
and step 3: and in the field assembly, the prefabricated stair beam frame is installed in place and then the stair boards are installed, the panel (201) is partially supported by the left supporting block (103) and the right supporting block (104), and the panel (201) is connected with the section space between the left supporting block (103) and the right supporting block (104).
2. The assembly type fast-assembling stair construction method according to claim 1, wherein: the bottom platforms (106) are arranged at the bottoms of the left beam frame (101) and the right beam frame (102), the top platforms (105) are arranged at the tops of the left beam frame (101) and the right beam frame (102), and the top platforms (105), the bottom platforms (106), the left beam frame (101), the right beam frame (102), the left supporting block (103) and the right supporting block (104) are prefabricated into a whole in a factory in advance.
3. The assembly type fast-assembling stair construction method according to claim 1, wherein: the panel (201) comprises an extension panel (203) positioned at the upper part and a support panel (204) positioned at the lower part, the length of the extension panel (203) is greater than that of the support panel (204), the support panel (204) is partially supported by a left support block (103) and a right support block (104), and cement is filled in a gap formed by the extension panel (203) and the left support block (103), the right support block (104), the left beam frame (101) and the right beam frame (102) when the panel is assembled on site in the step 3;
the bottom surface of the panel (201) is provided with protruding columns (202) which are arranged on two sides in rows, the top surface of the left supporting block (103) is provided with a left groove, the top surface of the right supporting block (104) is provided with a right groove, the protruding columns (202) on two sides of the bottom surface of the panel (201) are correspondingly arranged in the left groove and the right groove, and cement is filled in a gap formed by the protruding columns (202) and the left groove and the right groove during field assembly in the step 3.
4. The assembled quick-install stair construction method according to claim 3, wherein: two protruding columns (202) are arranged on each side, and cement is filled in gaps formed by the two protruding columns (202) and the left groove and the right groove respectively to enable the cross section of the cement to be in a shape like a Chinese character 'shan'.
5. The assembly type fast-assembling stair construction method according to claim 1, wherein: and (3) installing a wooden plate or a stone plate or an anti-skid steel plate (3) on the top surface of the panel (201) during field assembly in the step 3.
6. The assembled quick-install stair construction method according to claim 5, wherein: the cross-section of antiskid steel sheet (3) is the font of falling U, panel (201) surface is arranged in steel decking (301) of antiskid steel sheet (3), in panel (201) and left roof beam structure (101), the space that right roof beam structure (102) formed is arranged respectively in steel curb plate (302) of the both sides of antiskid steel sheet (3), when the on-the-spot assembly in the space that steel curb plate (302) and panel (201), left roof beam structure (101), right roof beam structure (102) formed packs cement and makes antiskid steel sheet (3) fixed.
7. The assembled quick-install stair construction method according to claim 5, wherein: the surface of the steel panel (301) of the antiskid steel plate (3) is provided with antiskid strips.
8. The assembly type fast-assembling stair construction method according to claim 5, wherein: the front side of the antiskid steel plate (3) is further provided with a baffle (303), and the baffle (303) enables a hollow part formed by the previous step plate (2) and the next step plate (2) to be shielded.
9. The assembly type fast-assembling stair construction method according to claim 8, wherein: the baffle (303) and the steel panel (301) of the antiskid steel plate (3) are of an integral structure.
CN202211105914.5A 2022-09-06 2022-09-06 Assembled type fast-assembling stair construction method Pending CN115324292A (en)

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CN202211105914.5A CN115324292A (en) 2022-09-06 2022-09-06 Assembled type fast-assembling stair construction method

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Application Number Priority Date Filing Date Title
CN202211105914.5A CN115324292A (en) 2022-09-06 2022-09-06 Assembled type fast-assembling stair construction method

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002167931A (en) * 2000-11-28 2002-06-11 Fujita Corp Precast reinforced concrete stairway and form for open string
WO2007011127A1 (en) * 2005-07-19 2007-01-25 Min-Seon Jeong Precast stairway system, unit structure thereof, and method of constructing stairway system using the same
CN104032904A (en) * 2014-05-26 2014-09-10 湖北弘毅建设有限公司 Combined assembled type stairway
CN204510650U (en) * 2015-01-22 2015-07-29 华南理工大学 A kind of precast splice type stringer type stairway
CN205531083U (en) * 2016-04-14 2016-08-31 杭州通达集团有限公司 Prefabrication type assembled stairway
CN207988380U (en) * 2018-03-19 2018-10-19 西安建筑科技大学 A kind of prefabricated assembled staircase structure
CN109386097A (en) * 2018-12-11 2019-02-26 中建二局第建筑工程有限公司 Precast stair and building
CN210737947U (en) * 2019-07-22 2020-06-12 浙江奔腾市政园林建设工程有限公司 Assembled stair
CN213477449U (en) * 2020-08-31 2021-06-18 上海家树建筑工程有限公司 Assembled stair for building
CN113250391A (en) * 2021-04-23 2021-08-13 上海德森建筑设计有限公司 Assembled stair
CN113944288A (en) * 2021-11-19 2022-01-18 李霞 Assembled concrete stair prefabricated component assembly structure

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002167931A (en) * 2000-11-28 2002-06-11 Fujita Corp Precast reinforced concrete stairway and form for open string
WO2007011127A1 (en) * 2005-07-19 2007-01-25 Min-Seon Jeong Precast stairway system, unit structure thereof, and method of constructing stairway system using the same
CN104032904A (en) * 2014-05-26 2014-09-10 湖北弘毅建设有限公司 Combined assembled type stairway
CN204510650U (en) * 2015-01-22 2015-07-29 华南理工大学 A kind of precast splice type stringer type stairway
CN205531083U (en) * 2016-04-14 2016-08-31 杭州通达集团有限公司 Prefabrication type assembled stairway
CN207988380U (en) * 2018-03-19 2018-10-19 西安建筑科技大学 A kind of prefabricated assembled staircase structure
CN109386097A (en) * 2018-12-11 2019-02-26 中建二局第建筑工程有限公司 Precast stair and building
CN210737947U (en) * 2019-07-22 2020-06-12 浙江奔腾市政园林建设工程有限公司 Assembled stair
CN213477449U (en) * 2020-08-31 2021-06-18 上海家树建筑工程有限公司 Assembled stair for building
CN113250391A (en) * 2021-04-23 2021-08-13 上海德森建筑设计有限公司 Assembled stair
CN113944288A (en) * 2021-11-19 2022-01-18 李霞 Assembled concrete stair prefabricated component assembly structure

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