CN113389331A - Wall structure on stair inclined steel beam and construction method - Google Patents
Wall structure on stair inclined steel beam and construction method Download PDFInfo
- Publication number
- CN113389331A CN113389331A CN202110731477.7A CN202110731477A CN113389331A CN 113389331 A CN113389331 A CN 113389331A CN 202110731477 A CN202110731477 A CN 202110731477A CN 113389331 A CN113389331 A CN 113389331A
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- Prior art keywords
- wall
- steel beam
- steel
- stair
- guide wall
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/022—Stairways; Layouts thereof characterised by the supporting structure
- E04F11/025—Stairways having stringers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
- E04B2/64—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
- E04B2/64—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete
- E04B2/66—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete characterised by special cross-section of the elongated members
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/122—Machines for joining reinforcing bars
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
Abstract
The invention relates to a wall structure on a stair inclined steel beam and a construction method, wherein the stair inclined steel beam comprises an upper ladder steel beam and a lower ladder steel beam, the wall structure comprises a guide wall fixed on at least one side of the lower ladder steel beam, two constructional columns fixed between the guide wall and the upper ladder steel beam, and a building wall built in an area surrounded by the guide wall, the upper ladder steel beam and the two constructional columns, pre-embedded ribs for fixing the guide wall and the lower ladder steel beam are pre-embedded in the guide wall, and the two constructional columns are respectively opposite to two ends of the lower ladder steel beam. The invention combines the embedded ribs, the guide wall and the constructional columns to form a stressed whole, and solves the technical problem that the wall body built on the inclined steel beam is difficult to be firmly fixed in the prior art. The base obliquely built at the bottom end of the building wall is optimized into the stepped horizontal base, so that the construction of a building structure is facilitated, and the stability of the building wall on the oblique steel beam is improved.
Description
Technical Field
The invention relates to the field of building construction, in particular to a wall structure on a stair inclined steel beam and a construction method.
Background
At present, more and more buildings adopt steel stairs, the steel stairs have the advantages of few pivots, high bearing capacity, multiple shapes, difficulty in structural influence of columns, floors and the like, firmness and firmness, and in the actual construction process, if a wall body needs to be built on oblique steel beams on two sides of the steel stairs, the building blocks and the oblique steel beams cannot be firmly connected, so that the wall body is directly built on the oblique steel beams and is difficult to firmly fix, and the whole building has potential safety hazards.
Disclosure of Invention
The invention provides a wall structure on a stair inclined steel beam and a construction method, and solves the technical problem that in the prior art, a wall built on the inclined steel beam is difficult to firmly fix.
The wall structure on the stair inclined steel beam comprises an upper stair steel beam and a lower stair steel beam, the wall structure comprises a guide wall fixed on at least one side of the lower stair steel beam, two constructional columns fixed between the guide wall and the upper stair steel beam, and a building wall built in an area surrounded by the guide wall, the upper stair steel beam and the two constructional columns, pre-embedded ribs for fixing the guide wall and the lower stair steel beam are pre-embedded in the guide wall, and the two constructional columns are respectively opposite to two ends of the lower stair steel beam.
The wall structure on the stair inclined steel beam is further improved in that the embedded ribs comprise a plurality of reinforcing ribs and at least one tie rib, the reinforcing ribs are embedded in the guide wall in advance, the reinforcing ribs are vertically fixed on the lower stair steel beam, the at least one tie rib is tied among the reinforcing ribs, and the tie ribs are parallel to the lower stair steel beam.
The wall structure on the stair inclined steel beam is further improved in that the bottom end of a longitudinal rib of the constructional column is fixed to the lower ladder steel beam, and the top end of the longitudinal rib is fixed to the upper ladder steel beam.
The wall body structure on the stair inclined steel beam is further improved in that the guide wall is in a step shape, and the masonry wall is matched with the guide wall.
The wall body structure on the stair inclined steel beam is further improved in that the constructional columns are in a sawtooth shape, and the masonry wall is matched with the constructional columns.
The invention also provides a construction method of the wall structure on the stair inclined steel beam, wherein the stair inclined steel beam comprises an upper stair steel beam and a lower stair steel beam, and the construction method comprises the following steps:
fixing a pre-buried rib on at least one side of the lower ladder steel beam;
pouring a guide wall at the position of the pre-embedded rib on the lower ladder steel beam, and embedding the pre-embedded rib into the guide wall;
two constructional columns are poured between the guide wall and the upper ladder steel beam, and the two constructional columns are respectively opposite to two ends of the lower ladder steel beam;
and building a masonry wall in the area surrounded by the guide wall, the upper ladder steel beam and the two constructional columns.
The construction method of the wall structure on the stair inclined steel beam is further improved in that the embedded ribs comprise a plurality of reinforcing ribs and at least one tie rib which are embedded in the guide wall in advance;
when fixing the pre-buried ribs on at least one side of the lower ladder steel beam, vertically fixing a plurality of reinforcing ribs on the lower ladder steel beam, and tying at least one tie rib between the reinforcing ribs, wherein the at least one tie rib is parallel to the lower ladder steel beam.
The construction method of the wall structure on the inclined steel beam of the stair is further improved in that before the guide wall is poured at the position of the embedded rib on the lower steel beam, the constructional column steel bar is bound, the bottom end of the longitudinal rib of the constructional column is fixed on the lower steel beam, and the top end of the longitudinal rib of the constructional column is fixed on the upper steel beam.
The construction method of the wall body structure on the stair inclined steel beam is further improved in that when the guide wall is poured, the guide wall is poured into a step shape;
when the masonry wall is built, adaptive building is carried out according to the shape of the guide wall.
The construction method of the wall body structure on the stair inclined steel beam is further improved in that when the constructional column is poured, the constructional column is poured into a sawtooth shape;
when the masonry wall is built, adaptive building is carried out according to the shape of the constructional column.
Compared with the prior art, the invention has positive and obvious effect. The invention combines the embedded ribs, the guide wall and the constructional columns to form a stressed whole, and solves the technical problem that the wall body built on the inclined steel beam is difficult to be firmly fixed in the prior art. The invention optimizes the base obliquely built at the bottom end of the building wall into a stepped horizontal base, facilitates the construction of a building structure, simultaneously arranges a constructional column on the platform at the upper end and the lower end of the stair steel inclined beam respectively, and utilizes the tie bars, the stepped guide wall and the constructional columns at the two ends of the inclined steel beam to form a stable frame structure so as to ensure the stability of the building wall body on the inclined steel beam.
Drawings
Fig. 1 is a schematic view of the wall structure on the stair steel inclined beam of the invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the wall structure on the stair inclined steel beam of the invention includes an upper stair steel beam 2 and a lower stair steel beam 1, the wall structure includes a guide wall 5 fixed on at least one side of the lower stair steel beam 1, two constructional columns 4 fixed between the guide wall 5 and the upper stair steel beam 2, and a masonry wall 3 built in the region surrounded by the guide wall 5, the upper stair steel beam 2 and the two constructional columns 4, pre-embedded ribs for fixing the guide wall 5 and the lower stair steel beam 1 are pre-embedded in the guide wall 5, and the two constructional columns 4 are respectively opposite to two ends of the lower stair steel beam 1.
Enclose into a fixed frame through lower ladder girder steel 1, last ladder girder steel 2, lead wall 5 and constructional column 4, build the wall 3 of building in this fixed frame to fixed the position of building the wall 3, avoided producing because of the atress and remove and warp.
Preferably, this pre-buried muscle is including pre-buried in this leading wall 5 many reinforcing bars 6 and an at least drawknot muscle, and 6 vertical fixation in this lower ladder girder steel 1 of many these reinforcing bars, and at least this drawknot muscle drawknot is between many these reinforcing bars 6, and this drawknot muscle 7 is on a parallel with this lower ladder girder steel 1.
The reinforcing ribs and the tie bars 7 can be reinforcing steel bars with the diameter of 12mm, a plurality of reinforcing steel bars are uniformly distributed and fixed on the lower ladder steel beam 1 at intervals, and the interval distance can be 300 mm. The strengthening rib can adopt and fixed with 1 welded mode of lower ladder girder steel, makes wall 5 and lower ladder girder steel 1 firmly fixed to act as the framework of steel reinforcement of leading wall 5, strengthened the intensity of leading wall 5.
Preferably, the bottom end of the longitudinal rib 8 of the constructional column 4 is fixed on the lower ladder steel beam 1, and the top end of the longitudinal rib 8 is fixed on the upper ladder steel beam 2.
Through the drawknot effect of the longitudinal ribs 8 of the constructional column 4, the stability of the whole masonry wall 3 and the constructional column 4 is ensured, and the constructional column 4 is prevented from sliding with the upper ladder steel beam 2 and the lower ladder steel beam 1.
Preferably, the guide wall 5 is stepped, and the masonry wall 3 is fitted to the guide wall 5.
The lower ladder girder steel 1 includes the slope section and lies in the straight section at slope section both ends respectively, and slope section and straight section are all laid and are fixed with and lead wall 5, and constructional column 4 is fixed on the wall 5 that leads of straight section, makes constructional column 4 fixed more firm. The stepped guide wall 5 facilitates the building of the masonry wall 3, and the masonry wall 3 is more tightly bonded with the guide wall 5.
Preferably, the construction columns 4 are serrated, and the masonry wall 3 is adapted to the construction columns 4.
The 3 joint of the wall of building of cockscomb structure post 4 messenger in construction post 4, make the wall of building 3 and the bonding of construction post 4 inseparabler to make the wall of building 3 and the difficult aversion of construction post 4.
The invention also provides a construction method of a wall structure on the stair inclined steel beam, wherein the stair inclined steel beam comprises an upper stair steel beam 2 and a lower stair steel beam 1, and the construction method comprises the following steps:
fixing a pre-buried rib on at least one side of the lower ladder steel beam 1;
pouring a guide wall 5 at the position of the embedded rib on the steel girder 1 of the lower ladder, and embedding the embedded rib into the guide wall 5;
pouring two constructional columns 4 between the guide wall 5 and the upper ladder steel beam 2, and respectively positioning the two constructional columns 4 at two ends of the lower ladder steel beam 1 in an opposite mode;
and building a masonry wall 3 in an area surrounded by the guide wall 5, the upper ladder steel beam 2 and the two constructional columns 4.
Fix on lower ladder girder steel 1 through first pre-buried muscle, make and lead wall 5 and lower ladder girder steel 1 fixed firm, solved the fixed insecure problem of concrete and glossy steel matter. Build wall 3 snap-on leading wall 5, the concrete material surface of leading wall 5 is favorable to building wall 3's fixed, and the constructional column 4 that 1 both ends of lower ladder girder steel are fixed and go up ladder girder steel 2 and will build wall 3 and enclose and establish into a fixed frame, has promoted the stability of building wall 3 greatly.
Preferably, the embedded bars comprise a plurality of reinforcing bars 6 and at least one tie bar 7 embedded in the guide wall 5;
when fixing the pre-buried ribs on at least one side of the lower ladder steel beam 1, vertically fixing a plurality of reinforcing ribs 6 on the lower ladder steel beam 1, and tying between the reinforcing ribs 6 through at least one tying rib 7, and enabling at least one tying rib 7 to be parallel to the lower ladder steel beam 1.
The reinforcing rib 6 can be fixed with the lower ladder steel beam 1 in a welding mode, and the tie rib 7 connects the reinforcing rib 6 into a whole together, so that the reinforcing rib 6 is not prone to toppling in the pouring process and loses the reinforcing effect.
Preferably, before the guide wall 5 is poured at the position of the embedded rib on the lower ladder steel beam 1, the reinforcing steel bar of the constructional column 4 is bound, the bottom end of the longitudinal rib 8 of the constructional column 4 is fixed on the lower ladder steel beam 1, and the top end of the longitudinal rib 8 of the constructional column 4 is fixed on the upper ladder steel beam 2.
The longitudinal ribs 8 of the constructional columns 4 can be fixed with the oblique steel beams in a welded mode, the upper portions of the constructional columns 4 are fixedly poured with the upper ladder steel beam 2, the lower portions of the constructional columns 4 are fixedly poured with the lower ladder steel beam 1, the masonry wall 3 is built between the two constructional columns 4, the constructional columns 4 are fixed on two sides of the masonry wall 3, and the possibility of deformation is reduced.
Preferably, when the guide wall 5 is poured, the guide wall 5 is poured into a step shape;
when the masonry wall 3 is constructed on the guide wall 5, adaptive masonry is performed according to the shape of the guide wall 5.
The lower ladder girder steel 1 includes the slope section and lies in the straight section at slope section both ends respectively, and slope section and straight section are all laid and are fixed with and are led wall 5, lead wall 5 and can select to be 200mm at the thickness of the slope section of lower ladder girder steel 1, and can select to be 150mm at the thickness of the straight section of lower ladder girder steel 1. The masonry wall 3 is matched with the guide wall 5 in masonry, so that the two structures are tightly bonded, gaps are reduced, and the overall strength is improved.
Preferably, when the constructional column 4 is poured, the constructional column 4 is poured into a zigzag shape;
when the masonry wall 3 is constructed, adaptive masonry is performed in accordance with the shape of the construction columns 4.
The masonry wall 3 is built according to the shape of the constructional column 4, so that the two structures are tightly bonded, gaps are reduced, and the overall strength is improved.
The invention combines the embedded ribs, the guide wall and the constructional columns to form a stressed whole, and solves the technical problem that the wall body built on the inclined steel beam is difficult to be firmly fixed in the prior art. The invention optimizes the base obliquely built at the bottom end of the building wall into a stepped horizontal base, facilitates the construction of a building structure, simultaneously arranges a constructional column on the platform at the upper end and the lower end of the stair steel inclined beam respectively, and utilizes the tie bars, the stepped guide wall and the constructional columns at the two ends of the inclined steel beam to form a stable frame structure so as to ensure the stability of the building wall body on the inclined steel beam.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a wall structure on oblique girder steel of stair, oblique girder steel of stair include ladder girder steel and lower girder steel, its characterized in that, wall structure including be fixed in lead the wall of at least one side on the lower girder steel, be fixed in lead the wall with two constructional columns between the girder steel of ladder and build by laying bricks or stones in lead the wall, go up ladder girder steel and two the regional wall of building that the constructional column encloses is built, lead and pre-buried the muscle that is used for fixing in the wall lead the wall with the lower girder steel, two the constructional column is counterpointed respectively in the both ends of lower girder steel.
2. The wall structure on the stair inclined steel beam as claimed in claim 1, wherein the pre-embedded ribs comprise a plurality of reinforcing ribs and at least one tie rib, the reinforcing ribs are pre-embedded in the guide wall and vertically fixed to the lower ladder steel beam, the at least one tie rib is tied between the reinforcing ribs, and the tie rib is parallel to the lower ladder steel beam.
3. The wall structure on a stair stringer according to claim 1, wherein a bottom end of a longitudinal rib of said construction post is fixed to said lower ladder steel beam, and a top end of said longitudinal rib is fixed to said upper ladder steel beam.
4. The wall structure on a stair stringer according to claim 1, wherein said guide wall is stepped and said masonry wall is adapted to said guide wall.
5. The wall structure on a stair stringer according to claim 1, wherein said construction columns are serrated and said masonry wall is adapted to said construction columns.
6. A construction method of a wall structure on a stair diagonal steel beam is characterized in that the stair diagonal steel beam comprises an upper ladder steel beam and a lower ladder steel beam, and the construction method comprises the following steps:
fixing a pre-buried rib on at least one side of the lower ladder steel beam;
pouring a guide wall at the position of the embedded rib on the steel girder of the lower ladder, and embedding the embedded rib into the guide wall;
two constructional columns are poured between the guide wall and the upper ladder steel beam, and the two constructional columns are respectively aligned to two ends of the lower ladder steel beam;
and building a masonry wall in the area surrounded by the guide wall, the upper ladder steel beam and the two constructional columns.
7. The construction method of the wall structure on the stair inclined steel beam according to claim 6, wherein the embedded ribs comprise a plurality of reinforcing ribs and at least one tie rib which are embedded in the guide wall;
lie in when the fixed pre-buried muscle of at least one side on the girder steel of lower ladder the vertical fixation is many on the girder steel of lower ladder the reinforcement muscle to through at least one the lacing wire drawknot in many between the reinforcement muscle, and make at least one the lacing wire is on a parallel with the girder steel of lower ladder.
8. The method of claim 6, wherein the constructional column steel bars are tied before the guide wall is poured at the position of the embedded bars on the lower steel girder, the bottom ends of the longitudinal bars of the constructional column are fixed on the lower steel girder, and the top ends of the longitudinal bars of the constructional column are fixed on the upper steel girder.
9. The method for constructing a wall structure on a stair-inclined steel beam according to claim 6, wherein the guide wall is cast into a step shape when the guide wall is cast;
when the masonry wall is built, adaptive building is carried out according to the shape of the guide wall.
10. The method of constructing a wall structure on a stair stringer according to claim 6, wherein the constructional column is cast in a zigzag shape when the constructional column is cast;
when the masonry wall is built, adaptive building is carried out according to the shape of the constructional column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731477.7A CN113389331B (en) | 2021-06-30 | 2021-06-30 | Wall structure on stair inclined steel beam and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731477.7A CN113389331B (en) | 2021-06-30 | 2021-06-30 | Wall structure on stair inclined steel beam and construction method |
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| Publication Number | Publication Date |
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| CN113389331A true CN113389331A (en) | 2021-09-14 |
| CN113389331B CN113389331B (en) | 2022-11-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08158572A (en) * | 1994-12-09 | 1996-06-18 | Taisei Corp | Precast concrete stairs and construction thereof |
| CN104878930A (en) * | 2015-06-02 | 2015-09-02 | 常州第一建筑集团有限公司 | One-time forming construction method for secondary structure and heat preservation plate of self-insulation wall body |
| US9347224B1 (en) * | 2015-01-09 | 2016-05-24 | Umm Al-Qura University | Step-block precast stair |
| CN106320706A (en) * | 2016-08-30 | 2017-01-11 | 中国冶集团有限公司 | Masonry-wall line-pipe, line-groove and line-box burying construction method |
| JP2017031668A (en) * | 2015-07-31 | 2017-02-09 | 株式会社田中構造設計 | Stairs structure |
| CN112459302A (en) * | 2020-12-09 | 2021-03-09 | 张以道 | Non-bearing fireproof partition wall for scissor stairs, scissor stairs and construction method of non-bearing fireproof partition wall |
-
2021
- 2021-06-30 CN CN202110731477.7A patent/CN113389331B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08158572A (en) * | 1994-12-09 | 1996-06-18 | Taisei Corp | Precast concrete stairs and construction thereof |
| US9347224B1 (en) * | 2015-01-09 | 2016-05-24 | Umm Al-Qura University | Step-block precast stair |
| CN104878930A (en) * | 2015-06-02 | 2015-09-02 | 常州第一建筑集团有限公司 | One-time forming construction method for secondary structure and heat preservation plate of self-insulation wall body |
| JP2017031668A (en) * | 2015-07-31 | 2017-02-09 | 株式会社田中構造設計 | Stairs structure |
| CN106320706A (en) * | 2016-08-30 | 2017-01-11 | 中国冶集团有限公司 | Masonry-wall line-pipe, line-groove and line-box burying construction method |
| CN112459302A (en) * | 2020-12-09 | 2021-03-09 | 张以道 | Non-bearing fireproof partition wall for scissor stairs, scissor stairs and construction method of non-bearing fireproof partition wall |
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| CN113389331B (en) | 2022-11-25 |
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