CN111155729A - Light prefabricated staircase with steps and boundary beams stressed together and prefabricating method thereof - Google Patents
Light prefabricated staircase with steps and boundary beams stressed together and prefabricating method thereof Download PDFInfo
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- CN111155729A CN111155729A CN202010044795.1A CN202010044795A CN111155729A CN 111155729 A CN111155729 A CN 111155729A CN 202010044795 A CN202010044795 A CN 202010044795A CN 111155729 A CN111155729 A CN 111155729A
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- steps
- prefabricated staircase
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- 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
- E04F11/09—Tread-and-riser units
-
- 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
- E04F2011/0203—Miscellaneous features of stairways not otherwise provided for
- E04F2011/0205—Stairways characterised by the use of specific materials for the supporting structure of the treads
- E04F2011/021—Stairways characterised by the use of specific materials for the supporting structure of the treads mainly of stone or stone like materials, e.g. concrete; mainly of glass
- E04F2011/0212—Stairways characterised by the use of specific materials for the supporting structure of the treads mainly of stone or stone like materials, e.g. concrete; mainly of glass mainly of concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Steps, Ramps, And Handrails (AREA)
Abstract
The invention discloses a light prefabricated staircase with the joint stress of steps and boundary beams, which comprises a plurality of steps, a step lower supporting plate, a side supporting frame and at least one integral reinforcing beam, wherein the side supporting frame comprises two boundary beams and two end beams which are correspondingly arranged from left to right, the step lower supporting plate is supported on a frame, four edges of the step lower supporting plate are respectively connected with the boundary beams and the end beams, the integral reinforcing beam is transversely arranged on the upper surface of the step lower supporting plate, two ends of the integral reinforcing beam are respectively connected with the boundary beams, the integral reinforcing beam protrudes upwards, the plurality of steps are arranged on the upper surface of the step lower supporting plate, and two ends of the steps are respectively connected with the boundary beams. The light prefabricated staircase not only meets the stress requirement of the staircase, but also effectively reduces the dead weight. The invention also discloses a prefabricating method, wherein the light prefabricated staircase is prefabricated in an integrally turned-down state, is suitable for prefabricating the light prefabricated staircase and is convenient to operate.
Description
Technical Field
The invention relates to a light prefabricated staircase with the steps and the boundary beam stressed together, and further designs a prefabricating method of the light prefabricated staircase with the steps and the boundary beam stressed together.
Background
Traditional cast-in-place stair, construction quality defect is more, appears expanding the mould easily, leaks thick liquid scheduling problem, and the personnel make a round trip to walk before the concrete reaches intensity, easily causes the destruction to the edges and corners of marking time.
Compared with cast-in-place concrete stairs, the prefabricated stairs can improve the engineering quality, improve the construction efficiency and reduce the environmental pollution, and meanwhile, the standardization degree of prefabricated stair components in one building is higher, so that the prefabricated stairs are widely applied.
Traditional stair adopt the board-like way in the stair tread, and stair span and board thickness are all great, and when adopting prefabricated stair, often because of the dead weight is great, and bring the burden for on-the-spot hoist and mount, especially the scissors ladder of residential building project, single stair component dead weight surpasss 5 tons, has greatly increased the hoist and mount burden.
To prefabricated staircase component, for guaranteeing to hoist smoothly, the way of adopting at present mainly has two kinds: firstly, the hoisting capacity of the tower crane is directly increased; secondly, the prefabricated staircase with large span is divided into two sections, and a structural beam is arranged in the middle to connect the two sections of the staircase into a whole. However, increasing the hoisting capacity of the tower crane directly increases the construction cost of the whole project; the method of dividing the stair component into two sections can increase the hoisting workload on site.
According to implementation opinions about the rapid development of the fabricated building issued by Guangdong province, more than 15% of newly built buildings in the province at the end of 2020 adopt the fabricated building, and more than 35% of newly built buildings at the end of 2025. With the development of the prefabricated building, the lifting influence of the stair component on the prefabricated project, particularly on the prefabricated residential project, is more prominent.
Disclosure of Invention
The invention aims to solve the first technical problem of providing a light prefabricated staircase with steps and boundary beams stressed together, which not only meets the stress requirement of the staircase, but also effectively reduces the dead weight.
The second technical problem to be solved by the invention is to provide a method for prefabricating the light prefabricated staircase, which is convenient to operate and bears the stress of the steps and the side beams together.
To solve the first technical problem, the technical scheme adopted by the invention is as follows:
the utility model provides a mark time and the common light-duty prefabricated staircase of atress of boundary beam, its characterized in that includes multistage mark time: still including marking time the bottom suspension fagging, limit portion carriage and at least one whole stiffening beam, limit portion carriage includes that two correspond the boundary beam that sets up about and two end beams that connect the both ends of two boundary beams respectively, the bottom suspension fagging supports on the frame of marking time, and mark time the four sides of bottom suspension fagging and link together with boundary beam and end beam respectively, whole stiffening beam transversely establishes the upper surface at the bottom suspension fagging of marking time, the both ends of whole stiffening beam link together with the boundary beam respectively, whole stiffening beam is upwards protruding, multistage marking time establishes the upper surface at the bottom suspension fagging of marking time, the both ends of marking time link together with the boundary beam respectively, and whole stiffening beam corresponds with mark time wherein, and locate in corresponding marking time, mark time with build integratively.
Furthermore, light materials are pre-embedded in the steps.
Further, the light material is a hollow PVC pipe or a solid PVC rod.
Furthermore, whole stiffening beam includes a plurality of triangle-shaped's that are a row of transverse arrangement shaping reinforcing bar, many transversely wear the transverse connection reinforcing bar that is arranged in connecting the shaping reinforcing bar in the shaping reinforcing bar and establish the end connection reinforcing bar at both ends, and in the partly extension of end connection reinforcing bar goes into the boundary beam, links together with the boundary beam.
Furthermore, the light prefabricated staircase further comprises overturning hanging nails and hoisting hanging nails which are pre-embedded on the side edges.
Furthermore, mounting holes are preset at two ends of the light prefabricated staircase respectively, and hole reinforcing ribs for reinforcing the mounting holes are pre-buried at the mounting holes.
Furthermore, a reinforcing mesh is arranged in the step, and the shape formed by bending the reinforcing mesh corresponds to the shape of the step.
Furthermore, the treading lower support plate comprises a thin plate, a plurality of transverse steel bars arranged on the surface of the thin plate side by side and a plurality of longitudinal steel bars arranged on the surface of the thin plate side by side.
To solve the second technical problem, the technical solution adopted by the present invention is as follows:
the prefabrication method of the light prefabricated staircase is characterized by comprising the following steps of:
s1: the light prefabricated staircase is prefabricated in an integrally turned-down state, a forming die is installed according to the shape of the light prefabricated staircase, the part of the forming die corresponding to the step is positioned below, and the other corresponding parts are positioned above;
s2: binding steel bars and embedded parts required by each part of the light prefabricated staircase in a forming die;
s3: pouring concrete into the forming die;
s4: and (5) forming, demolding, turning over to an upward state, and watering for curing.
Further, in step S4, the concrete is demolded when it reaches 75% of the design strength.
Compared with the prior art, the invention has the following beneficial effects:
1. the light prefabricated staircase effectively connects the steps, the step lower supporting plate, the edge supporting frame and the integral reinforcing beam into a whole, meets the stress requirement of a staircase component, effectively reduces the self weight of the staircase compared with the traditional prefabricated staircase, can be suitable for the normal tower crane hoisting capacity of a construction project, does not increase the field hoisting workload, and has important significance for the healthy development of an assembly project.
2. The light prefabricated staircase can be embedded with light materials in the steps, so that the weight of the light prefabricated staircase can be further reduced.
3. The prefabricating method adopts a reverse prefabricating mode, namely the light prefabricated staircase is integrally turned downwards in the prefabricating process, and is turned over after forming and demolding, so that the light prefabricated staircase is more suitable for prefabricating the light prefabricated staircase and is convenient to operate.
Drawings
FIG. 1 is a schematic plan view of a lightweight prefabricated staircase according to the present invention;
FIG. 2 is a schematic view of the reinforcing bars of the edge beam and the end beam of the light prefabricated staircase according to the present invention;
FIG. 3 is a schematic view of the structure of the step of the light prefabricated staircase according to the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic side view of the reinforcement structure of the integral reinforcement beam of the prefabricated light stairway according to the present invention;
fig. 6 is a front view schematically showing a reinforcing structure of an integral reinforcing beam of the lightweight prefabricated staircase according to the present invention.
The reference numerals in the drawings mean:
1-a boundary beam; 2, stepping; 2 a-stepping steel bars; 3-hollow PVC pipe; 4-end beam; 5-turning over the hanging nail; 6-hoisting hanging nails; 7-mounting holes; 8-hole reinforcing ribs; 9-reinforcing mesh; 10-a steel bar group; 11-an integral stiffening beam; 11 a-forming a steel bar; 11 b-end connection bars; 11 c-transverse connecting steel bars; 12-stepping lower supporting plate; 13-hanging nail reinforcing ribs.
Detailed Description
The invention is further described below with reference to examples.
The light prefabricated staircase with the steps and the side beams stressed together as shown in the figures 1 to 4 comprises a plurality of steps 2, a step lower supporting plate 12, an edge supporting frame and two integral reinforcing beams 11. Wherein, limit portion braced frame includes that two correspond the boundary beam 1 that sets up about and two are connected the end beam 4 at two ends of two boundary beams 1 respectively, and the backup pad 12 includes the sheet metal under marking time, many establish the horizontal reinforcing bar at the sheet metal upper surface side by side and many establish the vertical reinforcing bar at the sheet metal lower surface side by side.
The stepping lower support plate 12 is supported on the frame, and the four sides of the stepping lower support plate 12 are respectively connected with the edge beam 1 and the end beam 4 to connect the frame into a whole. Two whole stiffening beams 11 all transversely establish the upper surface at the lower backup pad 12 of marking time, are located the position near the both ends of light-duty prefabricated staircase respectively, and the both ends of whole stiffening beam 11 link together with boundary beam 1 respectively, and whole stiffening beam 11 is the upwards arch of triangle-shaped form, and multistage 2 of marking time establish the upper surface at the lower backup pad 12 of marking time, and the both ends of 2 marking time link together with boundary beam 1, and the lower backup pad 12 of marking time supports 2 of marking time. The two integral reinforcing beams 11 correspond to the two steps 2, are arranged in the corresponding steps and are integrally built with the steps. The upwards convex integral reinforcing beam 11 can play a role in supporting force along the direction of the stepping lower supporting plate 12 and connecting the two boundary beams 1 for the stepping 2, and integrally reinforces the light prefabricated staircase, so that the light prefabricated staircase can meet the stress requirement. All parts of the light prefabricated staircase are formed by pouring and tamping concrete together and are formed into a whole.
In order to further reduce the weight of the light prefabricated staircase, in the embodiment, except for the two poles of the feet corresponding to the integral stiffening beam 11, light materials are embedded in the rest feet 2, the light materials are hollow PVC pipes 3, and the hollow PVC pipes 3 are transversely arranged in the feet 2. Of course, the lightweight material may also be solid PVC rods and other lightweight fillers.
As shown in fig. 5 and 6, the integral reinforcing beam 11 includes a row of a plurality of triangular shaped forming reinforcing bars 11a arranged transversely, a plurality of transverse connecting reinforcing bars 11c passing through the forming reinforcing bars 11a transversely for connecting the forming reinforcing bars 11a, and end connecting reinforcing bars 11b provided at both ends, the end connecting reinforcing bars 11b are bent to be triangular, both ends of the end connecting reinforcing bars 11b extend downwards into the edge beam 1 and extend to the lower edge of the edge beam 1 to be connected with the edge beam 1. The end connection reinforcing bars 11b make the connection strength of the integral reinforcing beam 11 and the boundary beam 1 higher.
In order to facilitate prefabrication and hoisting, the turning hanging nails 5 and the hoisting hanging nails 6 are respectively embedded in the upper part and the lower part of the side edge of the light prefabricated staircase, and the hanging nail reinforcing ribs 13 are superposed with the end connecting steel bars 11b of the integral reinforcing beam.
In order to facilitate installation, mounting holes 7 are respectively preset at two ends of the light prefabricated staircase, hole reinforcing ribs 8 for reinforcing the mounting holes 7 are pre-embedded in the mounting holes 7, and the hole reinforcing ribs 8 are two U-shaped reinforcing steel bars pre-embedded at the upper end portion and the lower end portion of the mounting holes 7.
The reinforcing bar net piece 9 is arranged in the mark time in the embodiment, the shape formed by bending the reinforcing bar net piece 9 corresponds to the shape of the mark time 2, a multi-stage ladder shape corresponding to the mark time 2 is formed, the hollow PVC pipe 3 penetrates through the lower surface of the reinforcing bar net piece 9, and a plurality of transverse mark time reinforcing bars 2a are arranged below the reinforcing bar net piece 9 of the mark time 2.
Of course, the edge beam 1 and the end beam 4 of the edge supporting frame are also provided with the steel bar group 10, and the steel bar group 10 comprises a plurality of side-by-side square steel bars and connecting steel bars which are connected in a penetrating way.
The prefabricating method for prefabricating the light prefabricated staircase comprises the following steps of:
s1: the light prefabricated staircase is prefabricated in an integrally turned downward state, a forming die is installed in a reverse prefabrication mode according to the shape of the light prefabricated staircase, the part of the forming die corresponding to the step 2 is positioned below, the other corresponding parts are positioned above, and the installation positions of turning hanging nails 5 and hanging nails 6 are reserved at the side die;
s2: binding reinforcing steel bars and embedded parts required by each part of the light prefabricated staircase in a forming die, namely binding reinforcing steel bars and embedded parts required by a reinforcing steel bar net piece 9, a stepping reinforcing steel bar 2a, a hollow PVC pipe 3, a stepping lower supporting plate 12, a reinforcing steel bar group 10 in a side beam and an end beam, a turning hanging nail 5, a hanging nail 6 and the like, and binding into a whole;
s3: installing an end die and a cover plate of a forming die, and pouring concrete into the forming die;
s4: and when the concrete reaches about 75% of the designed strength, demolding and forming, turning to an upward state by using the turning hanging nail 5, and watering and curing.
And finally, hoisting and warehousing by using the hoisting nails 6 to wait for delivery.
The number of the integral reinforcement beams 11 of the present invention is set according to the design strength requirement.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (10)
1. The utility model provides a mark time and the common light-duty prefabricated staircase of atress of boundary beam, its characterized in that includes multistage mark time: the integrated reinforcement structure comprises a frame, a plurality of steps, a plurality of lower support plates, a plurality of edge beams and at least one integrated reinforcement beam, wherein the edge support plates are correspondingly arranged on the left and right sides of the frame, the edge beams are respectively connected with the two ends of the edge beams, the lower support plates are supported on the frame, the four sides of the lower support plates are respectively connected with the edge beams and the end beams, the integrated reinforcement beam is transversely arranged on the upper surface of the lower support plates, the two ends of the integrated reinforcement beam are respectively connected with the edge beams, the integrated reinforcement beam protrudes upwards, the steps are arranged on the upper surface of the lower support plates in multiple stages, the two ends of the steps are respectively connected with the edge beams, and the integrated reinforcement beam corresponds to the steps and is arranged in the corresponding steps to be integrally formed with the steps.
2. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: and embedding light materials in the steps.
3. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 2, wherein: the light material is a hollow PVC pipe or a solid PVC rod.
4. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: the integral reinforcing beam comprises a row of transversely arranged triangular forming reinforcing steel bars, a plurality of transverse connecting reinforcing steel bars transversely penetrating through the forming reinforcing steel bars and used for connecting the forming reinforcing steel bars, and end connecting reinforcing steel bars arranged at two ends, wherein one part of each end connecting reinforcing steel bar extends into the edge beam and is connected with the edge beam.
5. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: the light prefabricated staircase further comprises overturning hanging nails and hoisting hanging nails which are pre-buried at the side edges.
6. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: mounting holes are preset at two ends of the light prefabricated staircase respectively, and hole reinforcing ribs for reinforcing the mounting holes are pre-buried in the mounting holes.
7. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: the step is internally provided with a steel bar net piece, and the shape formed by bending the steel bar net piece corresponds to the shape of the step.
8. The lightweight prefabricated staircase with the co-stressed steps and the side beams as claimed in claim 1, wherein: the treading lower supporting plate comprises a thin plate, a plurality of transverse steel bars arranged on the surface of the thin plate side by side and a plurality of longitudinal steel bars arranged on the surface of the thin plate side by side.
9. A method of prefabricating a lightweight prefabricated staircase according to any one of claims 1 to 8, comprising the steps of:
s1: the light prefabricated staircase is prefabricated in an integrally turned-down state, a forming die is installed according to the shape of the light prefabricated staircase, the part of the forming die corresponding to the step is positioned below, and the other corresponding parts are positioned above;
s2: binding steel bars and embedded parts required by each part of the light prefabricated staircase in the forming die;
s3: pouring concrete into the forming die;
s4: and (5) forming, demolding, turning over to an upward state, and watering for curing.
10. Prefabrication method according to claim 9, characterised in that: in step S4, the concrete is demolded when it reaches 75% of the design strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044795.1A CN111155729A (en) | 2020-01-15 | 2020-01-15 | Light prefabricated staircase with steps and boundary beams stressed together and prefabricating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044795.1A CN111155729A (en) | 2020-01-15 | 2020-01-15 | Light prefabricated staircase with steps and boundary beams stressed together and prefabricating method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111155729A true CN111155729A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010044795.1A Pending CN111155729A (en) | 2020-01-15 | 2020-01-15 | Light prefabricated staircase with steps and boundary beams stressed together and prefabricating method thereof |
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| CN (1) | CN111155729A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175168A (en) * | 2021-04-27 | 2021-07-27 | 中国建筑第五工程局有限公司 | Ultra-light toughness stair |
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| KR100905806B1 (en) * | 2008-09-11 | 2009-07-02 | 정민선 | Precast concrete stair system |
| CN201661021U (en) * | 2010-03-11 | 2010-12-01 | 张吉华 | Prefabricated reinforced concrete stair |
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| CN109972802A (en) * | 2019-04-28 | 2019-07-05 | 清华大学建筑设计研究院有限公司 | A kind of lightweight precast concrete rib beam type stair |
| CN110453856A (en) * | 2019-07-22 | 2019-11-15 | 广东省建工设计院有限公司 | Light prefabricated stair, stringer type stairway construction and its construction method suitable for large span |
| CN212271447U (en) * | 2020-01-15 | 2021-01-01 | 广东省建科建筑设计院有限公司 | Light-duty prefabricated stair of marking time and boundary beam common atress |
-
2020
- 2020-01-15 CN CN202010044795.1A patent/CN111155729A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100905806B1 (en) * | 2008-09-11 | 2009-07-02 | 정민선 | Precast concrete stair system |
| CN201661021U (en) * | 2010-03-11 | 2010-12-01 | 张吉华 | Prefabricated reinforced concrete stair |
| CN205134792U (en) * | 2015-11-13 | 2016-04-06 | 赤峰力强预制构件有限公司 | Light -duty reinforced concrete prefabricated staircase |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175168A (en) * | 2021-04-27 | 2021-07-27 | 中国建筑第五工程局有限公司 | Ultra-light toughness stair |
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